drivers/net/phy/sfp.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/acpi.h>
   3 #include <linux/ctype.h>
   4 #include <linux/debugfs.h>
   5 #include <linux/delay.h>
   6 #include <linux/gpio/consumer.h>
   7 #include <linux/hwmon.h>
   8 #include <linux/i2c.h>
   9 #include <linux/interrupt.h>
  10 #include <linux/jiffies.h>
  11 #include <linux/mdio/mdio-i2c.h>
  12 #include <linux/module.h>
  13 #include <linux/mutex.h>
  14 #include <linux/of.h>
  15 #include <linux/phy.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/rtnetlink.h>
  18 #include <linux/slab.h>
  19 #include <linux/workqueue.h>
  20
  21 #include "sfp.h"
  22 #include "swphy.h"
  23
  24 enum {
  25         GPIO_MODDEF0,
  26         GPIO_LOS,
  27         GPIO_TX_FAULT,
  28         GPIO_TX_DISABLE,
  29         GPIO_RATE_SELECT,
  30         GPIO_MAX,
  31
  32         SFP_F_PRESENT = BIT(GPIO_MODDEF0),
  33         SFP_F_LOS = BIT(GPIO_LOS),
  34         SFP_F_TX_FAULT = BIT(GPIO_TX_FAULT),
  35         SFP_F_TX_DISABLE = BIT(GPIO_TX_DISABLE),
  36         SFP_F_RATE_SELECT = BIT(GPIO_RATE_SELECT),
  37
  38         SFP_E_INSERT = 0,
  39         SFP_E_REMOVE,
  40         SFP_E_DEV_ATTACH,
  41         SFP_E_DEV_DETACH,
  42         SFP_E_DEV_DOWN,
  43         SFP_E_DEV_UP,
  44         SFP_E_TX_FAULT,
  45         SFP_E_TX_CLEAR,
  46         SFP_E_LOS_HIGH,
  47         SFP_E_LOS_LOW,
  48         SFP_E_TIMEOUT,
  49
  50         SFP_MOD_EMPTY = 0,
  51         SFP_MOD_ERROR,
  52         SFP_MOD_PROBE,
  53         SFP_MOD_WAITDEV,
  54         SFP_MOD_HPOWER,
  55         SFP_MOD_WAITPWR,
  56         SFP_MOD_PRESENT,
  57
  58         SFP_DEV_DETACHED = 0,
  59         SFP_DEV_DOWN,
  60         SFP_DEV_UP,
  61
  62         SFP_S_DOWN = 0,
  63         SFP_S_FAIL,
  64         SFP_S_WAIT,
  65         SFP_S_INIT,
  66         SFP_S_INIT_PHY,
  67         SFP_S_INIT_TX_FAULT,
  68         SFP_S_WAIT_LOS,
  69         SFP_S_LINK_UP,
  70         SFP_S_TX_FAULT,
  71         SFP_S_REINIT,
  72         SFP_S_TX_DISABLE,
  73 };
  74
  75 static const char  * const mod_state_strings[] = {
  76         [SFP_MOD_EMPTY] = "empty",
  77         [SFP_MOD_ERROR] = "error",
  78         [SFP_MOD_PROBE] = "probe",
  79         [SFP_MOD_WAITDEV] = "waitdev",
  80         [SFP_MOD_HPOWER] = "hpower",
  81         [SFP_MOD_WAITPWR] = "waitpwr",
  82         [SFP_MOD_PRESENT] = "present",
  83 };
  84
  85 static const char *mod_state_to_str(unsigned short mod_state)
  86 {
  87         if (mod_state >= ARRAY_SIZE(mod_state_strings))
  88                 return "Unknown module state";
  89         return mod_state_strings[mod_state];
  90 }
  91
  92 static const char * const dev_state_strings[] = {
  93         [SFP_DEV_DETACHED] = "detached",
  94         [SFP_DEV_DOWN] = "down",
  95         [SFP_DEV_UP] = "up",
  96 };
  97
  98 static const char *dev_state_to_str(unsigned short dev_state)
  99 {
 100         if (dev_state >= ARRAY_SIZE(dev_state_strings))
 101                 return "Unknown device state";
 102         return dev_state_strings[dev_state];
 103 }
 104
 105 static const char * const event_strings[] = {
 106         [SFP_E_INSERT] = "insert",
 107         [SFP_E_REMOVE] = "remove",
 108         [SFP_E_DEV_ATTACH] = "dev_attach",
 109         [SFP_E_DEV_DETACH] = "dev_detach",
 110         [SFP_E_DEV_DOWN] = "dev_down",
 111         [SFP_E_DEV_UP] = "dev_up",
 112         [SFP_E_TX_FAULT] = "tx_fault",
 113         [SFP_E_TX_CLEAR] = "tx_clear",
 114         [SFP_E_LOS_HIGH] = "los_high",
 115         [SFP_E_LOS_LOW] = "los_low",
 116         [SFP_E_TIMEOUT] = "timeout",
 117 };
 118
 119 static const char *event_to_str(unsigned short event)
 120 {
 121         if (event >= ARRAY_SIZE(event_strings))
 122                 return "Unknown event";
 123         return event_strings[event];
 124 }
 125
 126 static const char * const sm_state_strings[] = {
 127         [SFP_S_DOWN] = "down",
 128         [SFP_S_FAIL] = "fail",
 129         [SFP_S_WAIT] = "wait",
 130         [SFP_S_INIT] = "init",
 131         [SFP_S_INIT_PHY] = "init_phy",
 132         [SFP_S_INIT_TX_FAULT] = "init_tx_fault",
 133         [SFP_S_WAIT_LOS] = "wait_los",
 134         [SFP_S_LINK_UP] = "link_up",
 135         [SFP_S_TX_FAULT] = "tx_fault",
 136         [SFP_S_REINIT] = "reinit",
 137         [SFP_S_TX_DISABLE] = "tx_disable",
 138 };
 139
 140 static const char *sm_state_to_str(unsigned short sm_state)
 141 {
 142         if (sm_state >= ARRAY_SIZE(sm_state_strings))
 143                 return "Unknown state";
 144         return sm_state_strings[sm_state];
 145 }
 146
 147 static const char *gpio_of_names[] = {
 148         "mod-def0",
 149         "los",
 150         "tx-fault",
 151         "tx-disable",
 152         "rate-select0",
 153 };
 154
 155 static const enum gpiod_flags gpio_flags[] = {
 156         GPIOD_IN,
 157         GPIOD_IN,
 158         GPIOD_IN,
 159         GPIOD_ASIS,
 160         GPIOD_ASIS,
 161 };
 162
 163 /* t_start_up (SFF-8431) or t_init (SFF-8472) is the time required for a
 164  * non-cooled module to initialise its laser safety circuitry. We wait
 165  * an initial T_WAIT period before we check the tx fault to give any PHY
 166  * on board (for a copper SFP) time to initialise.
 167  */
 168 #define T_WAIT                  msecs_to_jiffies(50)
 169 #define T_START_UP              msecs_to_jiffies(300)
 170 #define T_START_UP_BAD_GPON     msecs_to_jiffies(60000)
 171
 172 /* t_reset is the time required to assert the TX_DISABLE signal to reset
 173  * an indicated TX_FAULT.
 174  */
 175 #define T_RESET_US              10
 176 #define T_FAULT_RECOVER         msecs_to_jiffies(1000)
 177
 178 /* N_FAULT_INIT is the number of recovery attempts at module initialisation
 179  * time. If the TX_FAULT signal is not deasserted after this number of
 180  * attempts at clearing it, we decide that the module is faulty.
 181  * N_FAULT is the same but after the module has initialised.
 182  */
 183 #define N_FAULT_INIT            5
 184 #define N_FAULT                 5
 185
 186 /* T_PHY_RETRY is the time interval between attempts to probe the PHY.
 187  * R_PHY_RETRY is the number of attempts.
 188  */
 189 #define T_PHY_RETRY             msecs_to_jiffies(50)
 190 #define R_PHY_RETRY             12
 191
 192 /* SFP module presence detection is poor: the three MOD DEF signals are
 193  * the same length on the PCB, which means it's possible for MOD DEF 0 to
 194  * connect before the I2C bus on MOD DEF 1/2.
 195  *
 196  * The SFF-8472 specifies t_serial ("Time from power on until module is
 197  * ready for data transmission over the two wire serial bus.") as 300ms.
 198  */
 199 #define T_SERIAL                msecs_to_jiffies(300)
 200 #define T_HPOWER_LEVEL          msecs_to_jiffies(300)
 201 #define T_PROBE_RETRY_INIT      msecs_to_jiffies(100)
 202 #define R_PROBE_RETRY_INIT      10
 203 #define T_PROBE_RETRY_SLOW      msecs_to_jiffies(5000)
 204 #define R_PROBE_RETRY_SLOW      12
 205
 206 /* SFP modules appear to always have their PHY configured for bus address
 207  * 0x56 (which with mdio-i2c, translates to a PHY address of 22).
 208  */
 209 #define SFP_PHY_ADDR    22
 210
 211 struct sff_data {
 212         unsigned int gpios;
 213         bool (*module_supported)(const struct sfp_eeprom_id *id);
 214 };
 215
 216 struct sfp {
 217         struct device *dev;
 218         struct i2c_adapter *i2c;
 219         struct mii_bus *i2c_mii;
 220         struct sfp_bus *sfp_bus;
 221         struct phy_device *mod_phy;
 222         const struct sff_data *type;
 223         size_t i2c_block_size;
 224         u32 max_power_mW;
 225
 226         unsigned int (*get_state)(struct sfp *);
 227         void (*set_state)(struct sfp *, unsigned int);
 228         int (*read)(struct sfp *, bool, u8, void *, size_t);
 229         int (*write)(struct sfp *, bool, u8, void *, size_t);
 230
 231         struct gpio_desc *gpio[GPIO_MAX];
 232         int gpio_irq[GPIO_MAX];
 233
 234         bool need_poll;
 235
 236         struct mutex st_mutex;                  /* Protects state */
 237         unsigned int state_soft_mask;
 238         unsigned int state;
 239         struct delayed_work poll;
 240         struct delayed_work timeout;
 241         struct mutex sm_mutex;                  /* Protects state machine */
 242         unsigned char sm_mod_state;
 243         unsigned char sm_mod_tries_init;
 244         unsigned char sm_mod_tries;
 245         unsigned char sm_dev_state;
 246         unsigned short sm_state;
 247         unsigned char sm_fault_retries;
 248         unsigned char sm_phy_retries;
 249
 250         struct sfp_eeprom_id id;
 251         unsigned int module_power_mW;
 252         unsigned int module_t_start_up;
 253         bool tx_fault_ignore;
 254
 255 #if IS_ENABLED(CONFIG_HWMON)
 256         struct sfp_diag diag;
 257         struct delayed_work hwmon_probe;
 258         unsigned int hwmon_tries;
 259         struct device *hwmon_dev;
 260         char *hwmon_name;
 261 #endif
 262
 263 #if IS_ENABLED(CONFIG_DEBUG_FS)
 264         struct dentry *debugfs_dir;
 265 #endif
 266 };
 267
 268 static bool sff_module_supported(const struct sfp_eeprom_id *id)
 269 {
 270         return id->base.phys_id == SFF8024_ID_SFF_8472 &&
 271                id->base.phys_ext_id == SFP_PHYS_EXT_ID_SFP;
 272 }
 273
 274 static const struct sff_data sff_data = {
 275         .gpios = SFP_F_LOS | SFP_F_TX_FAULT | SFP_F_TX_DISABLE,
 276         .module_supported = sff_module_supported,
 277 };
 278
 279 static bool sfp_module_supported(const struct sfp_eeprom_id *id)
 280 {
 281         if (id->base.phys_id == SFF8024_ID_SFP &&
 282             id->base.phys_ext_id == SFP_PHYS_EXT_ID_SFP)
 283                 return true;
 284
 285         /* SFP GPON module Ubiquiti U-Fiber Instant has in its EEPROM stored
 286          * phys id SFF instead of SFP. Therefore mark this module explicitly
 287          * as supported based on vendor name and pn match.
 288          */
 289         if (id->base.phys_id == SFF8024_ID_SFF_8472 &&
 290             id->base.phys_ext_id == SFP_PHYS_EXT_ID_SFP &&
 291             !memcmp(id->base.vendor_name, "UBNT            ", 16) &&
 292             !memcmp(id->base.vendor_pn, "UF-INSTANT      ", 16))
 293                 return true;
 294
 295         return false;
 296 }
 297
 298 static const struct sff_data sfp_data = {
 299         .gpios = SFP_F_PRESENT | SFP_F_LOS | SFP_F_TX_FAULT |
 300                  SFP_F_TX_DISABLE | SFP_F_RATE_SELECT,
 301         .module_supported = sfp_module_supported,
 302 };
 303
 304 static const struct of_device_id sfp_of_match[] = {
 305         { .compatible = "sff,sff", .data = &sff_data, },
 306         { .compatible = "sff,sfp", .data = &sfp_data, },
 307         { },
 308 };
 309 MODULE_DEVICE_TABLE(of, sfp_of_match);
 310
 311 static unsigned long poll_jiffies;
 312
 313 static unsigned int sfp_gpio_get_state(struct sfp *sfp)
 314 {
 315         unsigned int i, state, v;
 316
 317         for (i = state = 0; i < GPIO_MAX; i++) {
 318                 if (gpio_flags[i] != GPIOD_IN || !sfp->gpio[i])
 319                         continue;
 320
 321                 v = gpiod_get_value_cansleep(sfp->gpio[i]);
 322                 if (v)
 323                         state |= BIT(i);
 324         }
 325
 326         return state;
 327 }
 328
 329 static unsigned int sff_gpio_get_state(struct sfp *sfp)
 330 {
 331         return sfp_gpio_get_state(sfp) | SFP_F_PRESENT;
 332 }
 333
 334 static void sfp_gpio_set_state(struct sfp *sfp, unsigned int state)
 335 {
 336         if (state & SFP_F_PRESENT) {
 337                 /* If the module is present, drive the signals */
 338                 if (sfp->gpio[GPIO_TX_DISABLE])
 339                         gpiod_direction_output(sfp->gpio[GPIO_TX_DISABLE],
 340                                                state & SFP_F_TX_DISABLE);
 341                 if (state & SFP_F_RATE_SELECT)
 342                         gpiod_direction_output(sfp->gpio[GPIO_RATE_SELECT],
 343                                                state & SFP_F_RATE_SELECT);
 344         } else {
 345                 /* Otherwise, let them float to the pull-ups */
 346                 if (sfp->gpio[GPIO_TX_DISABLE])
 347                         gpiod_direction_input(sfp->gpio[GPIO_TX_DISABLE]);
 348                 if (state & SFP_F_RATE_SELECT)
 349                         gpiod_direction_input(sfp->gpio[GPIO_RATE_SELECT]);
 350         }
 351 }
 352
 353 static int sfp_i2c_read(struct sfp *sfp, bool a2, u8 dev_addr, void *buf,
 354                         size_t len)
 355 {
 356         struct i2c_msg msgs[2];
 357         u8 bus_addr = a2 ? 0x51 : 0x50;
 358         size_t block_size = sfp->i2c_block_size;
 359         size_t this_len;
 360         int ret;
 361
 362         msgs[0].addr = bus_addr;
 363         msgs[0].flags = 0;
 364         msgs[0].len = 1;
 365         msgs[0].buf = &dev_addr;
 366         msgs[1].addr = bus_addr;
 367         msgs[1].flags = I2C_M_RD;
 368         msgs[1].len = len;
 369         msgs[1].buf = buf;
 370
 371         while (len) {
 372                 this_len = len;
 373                 if (this_len > block_size)
 374                         this_len = block_size;
 375
 376                 msgs[1].len = this_len;
 377
 378                 ret = i2c_transfer(sfp->i2c, msgs, ARRAY_SIZE(msgs));
 379                 if (ret < 0)
 380                         return ret;
 381
 382                 if (ret != ARRAY_SIZE(msgs))
 383                         break;
 384
 385                 msgs[1].buf += this_len;
 386                 dev_addr += this_len;
 387                 len -= this_len;
 388         }
 389
 390         return msgs[1].buf - (u8 *)buf;
 391 }
 392
 393 static int sfp_i2c_write(struct sfp *sfp, bool a2, u8 dev_addr, void *buf,
 394         size_t len)
 395 {
 396         struct i2c_msg msgs[1];
 397         u8 bus_addr = a2 ? 0x51 : 0x50;
 398         int ret;
 399
 400         msgs[0].addr = bus_addr;
 401         msgs[0].flags = 0;
 402         msgs[0].len = 1 + len;
 403         msgs[0].buf = kmalloc(1 + len, GFP_KERNEL);
 404         if (!msgs[0].buf)
 405                 return -ENOMEM;
 406
 407         msgs[0].buf[0] = dev_addr;
 408         memcpy(&msgs[0].buf[1], buf, len);
 409
 410         ret = i2c_transfer(sfp->i2c, msgs, ARRAY_SIZE(msgs));
 411
 412         kfree(msgs[0].buf);
 413
 414         if (ret < 0)
 415                 return ret;
 416
 417         return ret == ARRAY_SIZE(msgs) ? len : 0;
 418 }
 419
 420 static int sfp_i2c_configure(struct sfp *sfp, struct i2c_adapter *i2c)
 421 {
 422         struct mii_bus *i2c_mii;
 423         int ret;
 424
 425         if (!i2c_check_functionality(i2c, I2C_FUNC_I2C))
 426                 return -EINVAL;
 427
 428         sfp->i2c = i2c;
 429         sfp->read = sfp_i2c_read;
 430         sfp->write = sfp_i2c_write;
 431
 432         i2c_mii = mdio_i2c_alloc(sfp->dev, i2c);
 433         if (IS_ERR(i2c_mii))
 434                 return PTR_ERR(i2c_mii);
 435
 436         i2c_mii->name = "SFP I2C Bus";
 437         i2c_mii->phy_mask = ~0;
 438
 439         ret = mdiobus_register(i2c_mii);
 440         if (ret < 0) {
 441                 mdiobus_free(i2c_mii);
 442                 return ret;
 443         }
 444
 445         sfp->i2c_mii = i2c_mii;
 446
 447         return 0;
 448 }
 449
 450 /* Interface */
 451 static int sfp_read(struct sfp *sfp, bool a2, u8 addr, void *buf, size_t len)
 452 {
 453         return sfp->read(sfp, a2, addr, buf, len);
 454 }
 455
 456 static int sfp_write(struct sfp *sfp, bool a2, u8 addr, void *buf, size_t len)
 457 {
 458         return sfp->write(sfp, a2, addr, buf, len);
 459 }
 460
 461 static unsigned int sfp_soft_get_state(struct sfp *sfp)
 462 {
 463         unsigned int state = 0;
 464         u8 status;
 465         int ret;
 466
 467         ret = sfp_read(sfp, true, SFP_STATUS, &status, sizeof(status));
 468         if (ret == sizeof(status)) {
 469                 if (status & SFP_STATUS_RX_LOS)
 470                         state |= SFP_F_LOS;
 471                 if (status & SFP_STATUS_TX_FAULT)
 472                         state |= SFP_F_TX_FAULT;
 473         } else {
 474                 dev_err_ratelimited(sfp->dev,
 475                                     "failed to read SFP soft status: %pe\n",
 476                                     ERR_PTR(ret));
 477                 /* Preserve the current state */
 478                 state = sfp->state;
 479         }
 480
 481         return state & sfp->state_soft_mask;
 482 }
 483
 484 static void sfp_soft_set_state(struct sfp *sfp, unsigned int state)
 485 {
 486         u8 status;
 487
 488         if (sfp_read(sfp, true, SFP_STATUS, &status, sizeof(status)) ==
 489                      sizeof(status)) {
 490                 if (state & SFP_F_TX_DISABLE)
 491                         status |= SFP_STATUS_TX_DISABLE_FORCE;
 492                 else
 493                         status &= ~SFP_STATUS_TX_DISABLE_FORCE;
 494
 495                 sfp_write(sfp, true, SFP_STATUS, &status, sizeof(status));
 496         }
 497 }
 498
 499 static void sfp_soft_start_poll(struct sfp *sfp)
 500 {
 501         const struct sfp_eeprom_id *id = &sfp->id;
 502
 503         sfp->state_soft_mask = 0;
 504         if (id->ext.enhopts & SFP_ENHOPTS_SOFT_TX_DISABLE &&
 505             !sfp->gpio[GPIO_TX_DISABLE])
 506                 sfp->state_soft_mask |= SFP_F_TX_DISABLE;
 507         if (id->ext.enhopts & SFP_ENHOPTS_SOFT_TX_FAULT &&
 508             !sfp->gpio[GPIO_TX_FAULT])
 509                 sfp->state_soft_mask |= SFP_F_TX_FAULT;
 510         if (id->ext.enhopts & SFP_ENHOPTS_SOFT_RX_LOS &&
 511             !sfp->gpio[GPIO_LOS])
 512                 sfp->state_soft_mask |= SFP_F_LOS;
 513
 514         if (sfp->state_soft_mask & (SFP_F_LOS | SFP_F_TX_FAULT) &&
 515             !sfp->need_poll)
 516                 mod_delayed_work(system_wq, &sfp->poll, poll_jiffies);
 517 }
 518
 519 static void sfp_soft_stop_poll(struct sfp *sfp)
 520 {
 521         sfp->state_soft_mask = 0;
 522 }
 523
 524 static unsigned int sfp_get_state(struct sfp *sfp)
 525 {
 526         unsigned int state = sfp->get_state(sfp);
 527
 528         if (state & SFP_F_PRESENT &&
 529             sfp->state_soft_mask & (SFP_F_LOS | SFP_F_TX_FAULT))
 530                 state |= sfp_soft_get_state(sfp);
 531
 532         return state;
 533 }
 534
 535 static void sfp_set_state(struct sfp *sfp, unsigned int state)
 536 {
 537         sfp->set_state(sfp, state);
 538
 539         if (state & SFP_F_PRESENT &&
 540             sfp->state_soft_mask & SFP_F_TX_DISABLE)
 541                 sfp_soft_set_state(sfp, state);
 542 }
 543
 544 static unsigned int sfp_check(void *buf, size_t len)
 545 {
 546         u8 *p, check;
 547
 548         for (p = buf, check = 0; len; p++, len--)
 549                 check += *p;
 550
 551         return check;
 552 }
 553
 554 /* hwmon */
 555 #if IS_ENABLED(CONFIG_HWMON)
 556 static umode_t sfp_hwmon_is_visible(const void *data,
 557                                     enum hwmon_sensor_types type,
 558                                     u32 attr, int channel)
 559 {
 560         const struct sfp *sfp = data;
 561
 562         switch (type) {
 563         case hwmon_temp:
 564                 switch (attr) {
 565                 case hwmon_temp_min_alarm:
 566                 case hwmon_temp_max_alarm:
 567                 case hwmon_temp_lcrit_alarm:
 568                 case hwmon_temp_crit_alarm:
 569                 case hwmon_temp_min:
 570                 case hwmon_temp_max:
 571                 case hwmon_temp_lcrit:
 572                 case hwmon_temp_crit:
 573                         if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
 574                                 return 0;
 575                         fallthrough;
 576                 case hwmon_temp_input:
 577                 case hwmon_temp_label:
 578                         return 0444;
 579                 default:
 580                         return 0;
 581                 }
 582         case hwmon_in:
 583                 switch (attr) {
 584                 case hwmon_in_min_alarm:
 585                 case hwmon_in_max_alarm:
 586                 case hwmon_in_lcrit_alarm:
 587                 case hwmon_in_crit_alarm:
 588                 case hwmon_in_min:
 589                 case hwmon_in_max:
 590                 case hwmon_in_lcrit:
 591                 case hwmon_in_crit:
 592                         if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
 593                                 return 0;
 594                         fallthrough;
 595                 case hwmon_in_input:
 596                 case hwmon_in_label:
 597                         return 0444;
 598                 default:
 599                         return 0;
 600                 }
 601         case hwmon_curr:
 602                 switch (attr) {
 603                 case hwmon_curr_min_alarm:
 604                 case hwmon_curr_max_alarm:
 605                 case hwmon_curr_lcrit_alarm:
 606                 case hwmon_curr_crit_alarm:
 607                 case hwmon_curr_min:
 608                 case hwmon_curr_max:
 609                 case hwmon_curr_lcrit:
 610                 case hwmon_curr_crit:
 611                         if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
 612                                 return 0;
 613                         fallthrough;
 614                 case hwmon_curr_input:
 615                 case hwmon_curr_label:
 616                         return 0444;
 617                 default:
 618                         return 0;
 619                 }
 620         case hwmon_power:
 621                 /* External calibration of receive power requires
 622                  * floating point arithmetic. Doing that in the kernel
 623                  * is not easy, so just skip it. If the module does
 624                  * not require external calibration, we can however
 625                  * show receiver power, since FP is then not needed.
 626                  */
 627                 if (sfp->id.ext.diagmon & SFP_DIAGMON_EXT_CAL &&
 628                     channel == 1)
 629                         return 0;
 630                 switch (attr) {
 631                 case hwmon_power_min_alarm:
 632                 case hwmon_power_max_alarm:
 633                 case hwmon_power_lcrit_alarm:
 634                 case hwmon_power_crit_alarm:
 635                 case hwmon_power_min:
 636                 case hwmon_power_max:
 637                 case hwmon_power_lcrit:
 638                 case hwmon_power_crit:
 639                         if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
 640                                 return 0;
 641                         fallthrough;
 642                 case hwmon_power_input:
 643                 case hwmon_power_label:
 644                         return 0444;
 645                 default:
 646                         return 0;
 647                 }
 648         default:
 649                 return 0;
 650         }
 651 }
 652
 653 static int sfp_hwmon_read_sensor(struct sfp *sfp, int reg, long *value)
 654 {
 655         __be16 val;
 656         int err;
 657
 658         err = sfp_read(sfp, true, reg, &val, sizeof(val));
 659         if (err < 0)
 660                 return err;
 661
 662         *value = be16_to_cpu(val);
 663
 664         return 0;
 665 }
 666
 667 static void sfp_hwmon_to_rx_power(long *value)
 668 {
 669         *value = DIV_ROUND_CLOSEST(*value, 10);
 670 }
 671
 672 static void sfp_hwmon_calibrate(struct sfp *sfp, unsigned int slope, int offset,
 673                                 long *value)
 674 {
 675         if (sfp->id.ext.diagmon & SFP_DIAGMON_EXT_CAL)
 676                 *value = DIV_ROUND_CLOSEST(*value * slope, 256) + offset;
 677 }
 678
 679 static void sfp_hwmon_calibrate_temp(struct sfp *sfp, long *value)
 680 {
 681         sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_t_slope),
 682                             be16_to_cpu(sfp->diag.cal_t_offset), value);
 683
 684         if (*value >= 0x8000)
 685                 *value -= 0x10000;
 686
 687         *value = DIV_ROUND_CLOSEST(*value * 1000, 256);
 688 }
 689
 690 static void sfp_hwmon_calibrate_vcc(struct sfp *sfp, long *value)
 691 {
 692         sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_v_slope),
 693                             be16_to_cpu(sfp->diag.cal_v_offset), value);
 694
 695         *value = DIV_ROUND_CLOSEST(*value, 10);
 696 }
 697
 698 static void sfp_hwmon_calibrate_bias(struct sfp *sfp, long *value)
 699 {
 700         sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_txi_slope),
 701                             be16_to_cpu(sfp->diag.cal_txi_offset), value);
 702
 703         *value = DIV_ROUND_CLOSEST(*value, 500);
 704 }
 705
 706 static void sfp_hwmon_calibrate_tx_power(struct sfp *sfp, long *value)
 707 {
 708         sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_txpwr_slope),
 709                             be16_to_cpu(sfp->diag.cal_txpwr_offset), value);
 710
 711         *value = DIV_ROUND_CLOSEST(*value, 10);
 712 }
 713
 714 static int sfp_hwmon_read_temp(struct sfp *sfp, int reg, long *value)
 715 {
 716         int err;
 717
 718         err = sfp_hwmon_read_sensor(sfp, reg, value);
 719         if (err < 0)
 720                 return err;
 721
 722         sfp_hwmon_calibrate_temp(sfp, value);
 723
 724         return 0;
 725 }
 726
 727 static int sfp_hwmon_read_vcc(struct sfp *sfp, int reg, long *value)
 728 {
 729         int err;
 730
 731         err = sfp_hwmon_read_sensor(sfp, reg, value);
 732         if (err < 0)
 733                 return err;
 734
 735         sfp_hwmon_calibrate_vcc(sfp, value);
 736
 737         return 0;
 738 }
 739
 740 static int sfp_hwmon_read_bias(struct sfp *sfp, int reg, long *value)
 741 {
 742         int err;
 743
 744         err = sfp_hwmon_read_sensor(sfp, reg, value);
 745         if (err < 0)
 746                 return err;
 747
 748         sfp_hwmon_calibrate_bias(sfp, value);
 749
 750         return 0;
 751 }
 752
 753 static int sfp_hwmon_read_tx_power(struct sfp *sfp, int reg, long *value)
 754 {
 755         int err;
 756
 757         err = sfp_hwmon_read_sensor(sfp, reg, value);
 758         if (err < 0)
 759                 return err;
 760
 761         sfp_hwmon_calibrate_tx_power(sfp, value);
 762
 763         return 0;
 764 }
 765
 766 static int sfp_hwmon_read_rx_power(struct sfp *sfp, int reg, long *value)
 767 {
 768         int err;
 769
 770         err = sfp_hwmon_read_sensor(sfp, reg, value);
 771         if (err < 0)
 772                 return err;
 773
 774         sfp_hwmon_to_rx_power(value);
 775
 776         return 0;
 777 }
 778
 779 static int sfp_hwmon_temp(struct sfp *sfp, u32 attr, long *value)
 780 {
 781         u8 status;
 782         int err;
 783
 784         switch (attr) {
 785         case hwmon_temp_input:
 786                 return sfp_hwmon_read_temp(sfp, SFP_TEMP, value);
 787
 788         case hwmon_temp_lcrit:
 789                 *value = be16_to_cpu(sfp->diag.temp_low_alarm);
 790                 sfp_hwmon_calibrate_temp(sfp, value);
 791                 return 0;
 792
 793         case hwmon_temp_min:
 794                 *value = be16_to_cpu(sfp->diag.temp_low_warn);
 795                 sfp_hwmon_calibrate_temp(sfp, value);
 796                 return 0;
 797         case hwmon_temp_max:
 798                 *value = be16_to_cpu(sfp->diag.temp_high_warn);
 799                 sfp_hwmon_calibrate_temp(sfp, value);
 800                 return 0;
 801
 802         case hwmon_temp_crit:
 803                 *value = be16_to_cpu(sfp->diag.temp_high_alarm);
 804                 sfp_hwmon_calibrate_temp(sfp, value);
 805                 return 0;
 806
 807         case hwmon_temp_lcrit_alarm:
 808                 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
 809                 if (err < 0)
 810                         return err;
 811
 812                 *value = !!(status & SFP_ALARM0_TEMP_LOW);
 813                 return 0;
 814
 815         case hwmon_temp_min_alarm:
 816                 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
 817                 if (err < 0)
 818                         return err;
 819
 820                 *value = !!(status & SFP_WARN0_TEMP_LOW);
 821                 return 0;
 822
 823         case hwmon_temp_max_alarm:
 824                 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
 825                 if (err < 0)
 826                         return err;
 827
 828                 *value = !!(status & SFP_WARN0_TEMP_HIGH);
 829                 return 0;
 830
 831         case hwmon_temp_crit_alarm:
 832                 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
 833                 if (err < 0)
 834                         return err;
 835
 836                 *value = !!(status & SFP_ALARM0_TEMP_HIGH);
 837                 return 0;
 838         default:
 839                 return -EOPNOTSUPP;
 840         }
 841
 842         return -EOPNOTSUPP;
 843 }
 844
 845 static int sfp_hwmon_vcc(struct sfp *sfp, u32 attr, long *value)
 846 {
 847         u8 status;
 848         int err;
 849
 850         switch (attr) {
 851         case hwmon_in_input:
 852                 return sfp_hwmon_read_vcc(sfp, SFP_VCC, value);
 853
 854         case hwmon_in_lcrit:
 855                 *value = be16_to_cpu(sfp->diag.volt_low_alarm);
 856                 sfp_hwmon_calibrate_vcc(sfp, value);
 857                 return 0;
 858
 859         case hwmon_in_min:
 860                 *value = be16_to_cpu(sfp->diag.volt_low_warn);
 861                 sfp_hwmon_calibrate_vcc(sfp, value);
 862                 return 0;
 863
 864         case hwmon_in_max:
 865                 *value = be16_to_cpu(sfp->diag.volt_high_warn);
 866                 sfp_hwmon_calibrate_vcc(sfp, value);
 867                 return 0;
 868
 869         case hwmon_in_crit:
 870                 *value = be16_to_cpu(sfp->diag.volt_high_alarm);
 871                 sfp_hwmon_calibrate_vcc(sfp, value);
 872                 return 0;
 873
 874         case hwmon_in_lcrit_alarm:
 875                 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
 876                 if (err < 0)
 877                         return err;
 878
 879                 *value = !!(status & SFP_ALARM0_VCC_LOW);
 880                 return 0;
 881
 882         case hwmon_in_min_alarm:
 883                 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
 884                 if (err < 0)
 885                         return err;
 886
 887                 *value = !!(status & SFP_WARN0_VCC_LOW);
 888                 return 0;
 889
 890         case hwmon_in_max_alarm:
 891                 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
 892                 if (err < 0)
 893                         return err;
 894
 895                 *value = !!(status & SFP_WARN0_VCC_HIGH);
 896                 return 0;
 897
 898         case hwmon_in_crit_alarm:
 899                 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
 900                 if (err < 0)
 901                         return err;
 902
 903                 *value = !!(status & SFP_ALARM0_VCC_HIGH);
 904                 return 0;
 905         default:
 906                 return -EOPNOTSUPP;
 907         }
 908
 909         return -EOPNOTSUPP;
 910 }
 911
 912 static int sfp_hwmon_bias(struct sfp *sfp, u32 attr, long *value)
 913 {
 914         u8 status;
 915         int err;
 916
 917         switch (attr) {
 918         case hwmon_curr_input:
 919                 return sfp_hwmon_read_bias(sfp, SFP_TX_BIAS, value);
 920
 921         case hwmon_curr_lcrit:
 922                 *value = be16_to_cpu(sfp->diag.bias_low_alarm);
 923                 sfp_hwmon_calibrate_bias(sfp, value);
 924                 return 0;
 925
 926         case hwmon_curr_min:
 927                 *value = be16_to_cpu(sfp->diag.bias_low_warn);
 928                 sfp_hwmon_calibrate_bias(sfp, value);
 929                 return 0;
 930
 931         case hwmon_curr_max:
 932                 *value = be16_to_cpu(sfp->diag.bias_high_warn);
 933                 sfp_hwmon_calibrate_bias(sfp, value);
 934                 return 0;
 935
 936         case hwmon_curr_crit:
 937                 *value = be16_to_cpu(sfp->diag.bias_high_alarm);
 938                 sfp_hwmon_calibrate_bias(sfp, value);
 939                 return 0;
 940
 941         case hwmon_curr_lcrit_alarm:
 942                 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
 943                 if (err < 0)
 944                         return err;
 945
 946                 *value = !!(status & SFP_ALARM0_TX_BIAS_LOW);
 947                 return 0;
 948
 949         case hwmon_curr_min_alarm:
 950                 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
 951                 if (err < 0)
 952                         return err;
 953
 954                 *value = !!(status & SFP_WARN0_TX_BIAS_LOW);
 955                 return 0;
 956
 957         case hwmon_curr_max_alarm:
 958                 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
 959                 if (err < 0)
 960                         return err;
 961
 962                 *value = !!(status & SFP_WARN0_TX_BIAS_HIGH);
 963                 return 0;
 964
 965         case hwmon_curr_crit_alarm:
 966                 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
 967                 if (err < 0)
 968                         return err;
 969
 970                 *value = !!(status & SFP_ALARM0_TX_BIAS_HIGH);
 971                 return 0;
 972         default:
 973                 return -EOPNOTSUPP;
 974         }
 975
 976         return -EOPNOTSUPP;
 977 }
 978
 979 static int sfp_hwmon_tx_power(struct sfp *sfp, u32 attr, long *value)
 980 {
 981         u8 status;
 982         int err;
 983
 984         switch (attr) {
 985         case hwmon_power_input:
 986                 return sfp_hwmon_read_tx_power(sfp, SFP_TX_POWER, value);
 987
 988         case hwmon_power_lcrit:
 989                 *value = be16_to_cpu(sfp->diag.txpwr_low_alarm);
 990                 sfp_hwmon_calibrate_tx_power(sfp, value);
 991                 return 0;
 992
 993         case hwmon_power_min:
 994                 *value = be16_to_cpu(sfp->diag.txpwr_low_warn);
 995                 sfp_hwmon_calibrate_tx_power(sfp, value);
 996                 return 0;
 997
 998         case hwmon_power_max:
 999                 *value = be16_to_cpu(sfp->diag.txpwr_high_warn);
1000                 sfp_hwmon_calibrate_tx_power(sfp, value);
1001                 return 0;
1002
1003         case hwmon_power_crit:
1004                 *value = be16_to_cpu(sfp->diag.txpwr_high_alarm);
1005                 sfp_hwmon_calibrate_tx_power(sfp, value);
1006                 return 0;
1007
1008         case hwmon_power_lcrit_alarm:
1009                 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
1010                 if (err < 0)
1011                         return err;
1012
1013                 *value = !!(status & SFP_ALARM0_TXPWR_LOW);
1014                 return 0;
1015
1016         case hwmon_power_min_alarm:
1017                 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
1018                 if (err < 0)
1019                         return err;
1020
1021                 *value = !!(status & SFP_WARN0_TXPWR_LOW);
1022                 return 0;
1023
1024         case hwmon_power_max_alarm:
1025                 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
1026                 if (err < 0)
1027                         return err;
1028
1029                 *value = !!(status & SFP_WARN0_TXPWR_HIGH);
1030                 return 0;
1031
1032         case hwmon_power_crit_alarm:
1033                 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
1034                 if (err < 0)
1035                         return err;
1036
1037                 *value = !!(status & SFP_ALARM0_TXPWR_HIGH);
1038                 return 0;
1039         default:
1040                 return -EOPNOTSUPP;
1041         }
1042
1043         return -EOPNOTSUPP;
1044 }
1045
1046 static int sfp_hwmon_rx_power(struct sfp *sfp, u32 attr, long *value)
1047 {
1048         u8 status;
1049         int err;
1050
1051         switch (attr) {
1052         case hwmon_power_input:
1053                 return sfp_hwmon_read_rx_power(sfp, SFP_RX_POWER, value);
1054
1055         case hwmon_power_lcrit:
1056                 *value = be16_to_cpu(sfp->diag.rxpwr_low_alarm);
1057                 sfp_hwmon_to_rx_power(value);
1058                 return 0;
1059
1060         case hwmon_power_min:
1061                 *value = be16_to_cpu(sfp->diag.rxpwr_low_warn);
1062                 sfp_hwmon_to_rx_power(value);
1063                 return 0;
1064
1065         case hwmon_power_max:
1066                 *value = be16_to_cpu(sfp->diag.rxpwr_high_warn);
1067                 sfp_hwmon_to_rx_power(value);
1068                 return 0;
1069
1070         case hwmon_power_crit:
1071                 *value = be16_to_cpu(sfp->diag.rxpwr_high_alarm);
1072                 sfp_hwmon_to_rx_power(value);
1073                 return 0;
1074
1075         case hwmon_power_lcrit_alarm:
1076                 err = sfp_read(sfp, true, SFP_ALARM1, &status, sizeof(status));
1077                 if (err < 0)
1078                         return err;
1079
1080                 *value = !!(status & SFP_ALARM1_RXPWR_LOW);
1081                 return 0;
1082
1083         case hwmon_power_min_alarm:
1084                 err = sfp_read(sfp, true, SFP_WARN1, &status, sizeof(status));
1085                 if (err < 0)
1086                         return err;
1087
1088                 *value = !!(status & SFP_WARN1_RXPWR_LOW);
1089                 return 0;
1090
1091         case hwmon_power_max_alarm:
1092                 err = sfp_read(sfp, true, SFP_WARN1, &status, sizeof(status));
1093                 if (err < 0)
1094                         return err;
1095
1096                 *value = !!(status & SFP_WARN1_RXPWR_HIGH);
1097                 return 0;
1098
1099         case hwmon_power_crit_alarm:
1100                 err = sfp_read(sfp, true, SFP_ALARM1, &status, sizeof(status));
1101                 if (err < 0)
1102                         return err;
1103
1104                 *value = !!(status & SFP_ALARM1_RXPWR_HIGH);
1105                 return 0;
1106         default:
1107                 return -EOPNOTSUPP;
1108         }
1109
1110         return -EOPNOTSUPP;
1111 }
1112
1113 static int sfp_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
1114                           u32 attr, int channel, long *value)
1115 {
1116         struct sfp *sfp = dev_get_drvdata(dev);
1117
1118         switch (type) {
1119         case hwmon_temp:
1120                 return sfp_hwmon_temp(sfp, attr, value);
1121         case hwmon_in:
1122                 return sfp_hwmon_vcc(sfp, attr, value);
1123         case hwmon_curr:
1124                 return sfp_hwmon_bias(sfp, attr, value);
1125         case hwmon_power:
1126                 switch (channel) {
1127                 case 0:
1128                         return sfp_hwmon_tx_power(sfp, attr, value);
1129                 case 1:
1130                         return sfp_hwmon_rx_power(sfp, attr, value);
1131                 default:
1132                         return -EOPNOTSUPP;
1133                 }
1134         default:
1135                 return -EOPNOTSUPP;
1136         }
1137 }
1138
1139 static const char *const sfp_hwmon_power_labels[] = {
1140         "TX_power",
1141         "RX_power",
1142 };
1143
1144 static int sfp_hwmon_read_string(struct device *dev,
1145                                  enum hwmon_sensor_types type,
1146                                  u32 attr, int channel, const char **str)
1147 {
1148         switch (type) {
1149         case hwmon_curr:
1150                 switch (attr) {
1151                 case hwmon_curr_label:
1152                         *str = "bias";
1153                         return 0;
1154                 default:
1155                         return -EOPNOTSUPP;
1156                 }
1157                 break;
1158         case hwmon_temp:
1159                 switch (attr) {
1160                 case hwmon_temp_label:
1161                         *str = "temperature";
1162                         return 0;
1163                 default:
1164                         return -EOPNOTSUPP;
1165                 }
1166                 break;
1167         case hwmon_in:
1168                 switch (attr) {
1169                 case hwmon_in_label:
1170                         *str = "VCC";
1171                         return 0;
1172                 default:
1173                         return -EOPNOTSUPP;
1174                 }
1175                 break;
1176         case hwmon_power:
1177                 switch (attr) {
1178                 case hwmon_power_label:
1179                         *str = sfp_hwmon_power_labels[channel];
1180                         return 0;
1181                 default:
1182                         return -EOPNOTSUPP;
1183                 }
1184                 break;
1185         default:
1186                 return -EOPNOTSUPP;
1187         }
1188
1189         return -EOPNOTSUPP;
1190 }
1191
1192 static const struct hwmon_ops sfp_hwmon_ops = {
1193         .is_visible = sfp_hwmon_is_visible,
1194         .read = sfp_hwmon_read,
1195         .read_string = sfp_hwmon_read_string,
1196 };
1197
1198 static const struct hwmon_channel_info *sfp_hwmon_info[] = {
1199         HWMON_CHANNEL_INFO(chip,
1200                            HWMON_C_REGISTER_TZ),
1201         HWMON_CHANNEL_INFO(in,
1202                            HWMON_I_INPUT |
1203                            HWMON_I_MAX | HWMON_I_MIN |
1204                            HWMON_I_MAX_ALARM | HWMON_I_MIN_ALARM |
1205                            HWMON_I_CRIT | HWMON_I_LCRIT |
1206                            HWMON_I_CRIT_ALARM | HWMON_I_LCRIT_ALARM |
1207                            HWMON_I_LABEL),
1208         HWMON_CHANNEL_INFO(temp,
1209                            HWMON_T_INPUT |
1210                            HWMON_T_MAX | HWMON_T_MIN |
1211                            HWMON_T_MAX_ALARM | HWMON_T_MIN_ALARM |
1212                            HWMON_T_CRIT | HWMON_T_LCRIT |
1213                            HWMON_T_CRIT_ALARM | HWMON_T_LCRIT_ALARM |
1214                            HWMON_T_LABEL),
1215         HWMON_CHANNEL_INFO(curr,
1216                            HWMON_C_INPUT |
1217                            HWMON_C_MAX | HWMON_C_MIN |
1218                            HWMON_C_MAX_ALARM | HWMON_C_MIN_ALARM |
1219                            HWMON_C_CRIT | HWMON_C_LCRIT |
1220                            HWMON_C_CRIT_ALARM | HWMON_C_LCRIT_ALARM |
1221                            HWMON_C_LABEL),
1222         HWMON_CHANNEL_INFO(power,
1223                            /* Transmit power */
1224                            HWMON_P_INPUT |
1225                            HWMON_P_MAX | HWMON_P_MIN |
1226                            HWMON_P_MAX_ALARM | HWMON_P_MIN_ALARM |
1227                            HWMON_P_CRIT | HWMON_P_LCRIT |
1228                            HWMON_P_CRIT_ALARM | HWMON_P_LCRIT_ALARM |
1229                            HWMON_P_LABEL,
1230                            /* Receive power */
1231                            HWMON_P_INPUT |
1232                            HWMON_P_MAX | HWMON_P_MIN |
1233                            HWMON_P_MAX_ALARM | HWMON_P_MIN_ALARM |
1234                            HWMON_P_CRIT | HWMON_P_LCRIT |
1235                            HWMON_P_CRIT_ALARM | HWMON_P_LCRIT_ALARM |
1236                            HWMON_P_LABEL),
1237         NULL,
1238 };
1239
1240 static const struct hwmon_chip_info sfp_hwmon_chip_info = {
1241         .ops = &sfp_hwmon_ops,
1242         .info = sfp_hwmon_info,
1243 };
1244
1245 static void sfp_hwmon_probe(struct work_struct *work)
1246 {
1247         struct sfp *sfp = container_of(work, struct sfp, hwmon_probe.work);
1248         int err;
1249
1250         /* hwmon interface needs to access 16bit registers in atomic way to
1251          * guarantee coherency of the diagnostic monitoring data. If it is not
1252          * possible to guarantee coherency because EEPROM is broken in such way
1253          * that does not support atomic 16bit read operation then we have to
1254          * skip registration of hwmon device.
1255          */
1256         if (sfp->i2c_block_size < 2) {
1257                 dev_info(sfp->dev,
1258                          "skipping hwmon device registration due to broken EEPROM\n");
1259                 dev_info(sfp->dev,
1260                          "diagnostic EEPROM area cannot be read atomically to guarantee data coherency\n");
1261                 return;
1262         }
1263
1264         err = sfp_read(sfp, true, 0, &sfp->diag, sizeof(sfp->diag));
1265         if (err < 0) {
1266                 if (sfp->hwmon_tries--) {
1267                         mod_delayed_work(system_wq, &sfp->hwmon_probe,
1268                                          T_PROBE_RETRY_SLOW);
1269                 } else {
1270                         dev_warn(sfp->dev, "hwmon probe failed: %pe\n",
1271                                  ERR_PTR(err));
1272                 }
1273                 return;
1274         }
1275
1276         sfp->hwmon_name = hwmon_sanitize_name(dev_name(sfp->dev));
1277         if (IS_ERR(sfp->hwmon_name)) {
1278                 dev_err(sfp->dev, "out of memory for hwmon name\n");
1279                 return;
1280         }
1281
1282         sfp->hwmon_dev = hwmon_device_register_with_info(sfp->dev,
1283                                                          sfp->hwmon_name, sfp,
1284                                                          &sfp_hwmon_chip_info,
1285                                                          NULL);
1286         if (IS_ERR(sfp->hwmon_dev))
1287                 dev_err(sfp->dev, "failed to register hwmon device: %ld\n",
1288                         PTR_ERR(sfp->hwmon_dev));
1289 }
1290
1291 static int sfp_hwmon_insert(struct sfp *sfp)
1292 {
1293         if (sfp->id.ext.sff8472_compliance == SFP_SFF8472_COMPLIANCE_NONE)
1294                 return 0;
1295
1296         if (!(sfp->id.ext.diagmon & SFP_DIAGMON_DDM))
1297                 return 0;
1298
1299         if (sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE)
1300                 /* This driver in general does not support address
1301                  * change.
1302                  */
1303                 return 0;
1304
1305         mod_delayed_work(system_wq, &sfp->hwmon_probe, 1);
1306         sfp->hwmon_tries = R_PROBE_RETRY_SLOW;
1307
1308         return 0;
1309 }
1310
1311 static void sfp_hwmon_remove(struct sfp *sfp)
1312 {
1313         cancel_delayed_work_sync(&sfp->hwmon_probe);
1314         if (!IS_ERR_OR_NULL(sfp->hwmon_dev)) {
1315                 hwmon_device_unregister(sfp->hwmon_dev);
1316                 sfp->hwmon_dev = NULL;
1317                 kfree(sfp->hwmon_name);
1318         }
1319 }
1320
1321 static int sfp_hwmon_init(struct sfp *sfp)
1322 {
1323         INIT_DELAYED_WORK(&sfp->hwmon_probe, sfp_hwmon_probe);
1324
1325         return 0;
1326 }
1327
1328 static void sfp_hwmon_exit(struct sfp *sfp)
1329 {
1330         cancel_delayed_work_sync(&sfp->hwmon_probe);
1331 }
1332 #else
1333 static int sfp_hwmon_insert(struct sfp *sfp)
1334 {
1335         return 0;
1336 }
1337
1338 static void sfp_hwmon_remove(struct sfp *sfp)
1339 {
1340 }
1341
1342 static int sfp_hwmon_init(struct sfp *sfp)
1343 {
1344         return 0;
1345 }
1346
1347 static void sfp_hwmon_exit(struct sfp *sfp)
1348 {
1349 }
1350 #endif
1351
1352 /* Helpers */
1353 static void sfp_module_tx_disable(struct sfp *sfp)
1354 {
1355         dev_dbg(sfp->dev, "tx disable %u -> %u\n",
1356                 sfp->state & SFP_F_TX_DISABLE ? 1 : 0, 1);
1357         sfp->state |= SFP_F_TX_DISABLE;
1358         sfp_set_state(sfp, sfp->state);
1359 }
1360
1361 static void sfp_module_tx_enable(struct sfp *sfp)
1362 {
1363         dev_dbg(sfp->dev, "tx disable %u -> %u\n",
1364                 sfp->state & SFP_F_TX_DISABLE ? 1 : 0, 0);
1365         sfp->state &= ~SFP_F_TX_DISABLE;
1366         sfp_set_state(sfp, sfp->state);
1367 }
1368
1369 #if IS_ENABLED(CONFIG_DEBUG_FS)
1370 static int sfp_debug_state_show(struct seq_file *s, void *data)
1371 {
1372         struct sfp *sfp = s->private;
1373
1374         seq_printf(s, "Module state: %s\n",
1375                    mod_state_to_str(sfp->sm_mod_state));
1376         seq_printf(s, "Module probe attempts: %d %d\n",
1377                    R_PROBE_RETRY_INIT - sfp->sm_mod_tries_init,
1378                    R_PROBE_RETRY_SLOW - sfp->sm_mod_tries);
1379         seq_printf(s, "Device state: %s\n",
1380                    dev_state_to_str(sfp->sm_dev_state));
1381         seq_printf(s, "Main state: %s\n",
1382                    sm_state_to_str(sfp->sm_state));
1383         seq_printf(s, "Fault recovery remaining retries: %d\n",
1384                    sfp->sm_fault_retries);
1385         seq_printf(s, "PHY probe remaining retries: %d\n",
1386                    sfp->sm_phy_retries);
1387         seq_printf(s, "moddef0: %d\n", !!(sfp->state & SFP_F_PRESENT));
1388         seq_printf(s, "rx_los: %d\n", !!(sfp->state & SFP_F_LOS));
1389         seq_printf(s, "tx_fault: %d\n", !!(sfp->state & SFP_F_TX_FAULT));
1390         seq_printf(s, "tx_disable: %d\n", !!(sfp->state & SFP_F_TX_DISABLE));
1391         return 0;
1392 }
1393 DEFINE_SHOW_ATTRIBUTE(sfp_debug_state);
1394
1395 static void sfp_debugfs_init(struct sfp *sfp)
1396 {
1397         sfp->debugfs_dir = debugfs_create_dir(dev_name(sfp->dev), NULL);
1398
1399         debugfs_create_file("state", 0600, sfp->debugfs_dir, sfp,
1400                             &sfp_debug_state_fops);
1401 }
1402
1403 static void sfp_debugfs_exit(struct sfp *sfp)
1404 {
1405         debugfs_remove_recursive(sfp->debugfs_dir);
1406 }
1407 #else
1408 static void sfp_debugfs_init(struct sfp *sfp)
1409 {
1410 }
1411
1412 static void sfp_debugfs_exit(struct sfp *sfp)
1413 {
1414 }
1415 #endif
1416
1417 static void sfp_module_tx_fault_reset(struct sfp *sfp)
1418 {
1419         unsigned int state = sfp->state;
1420
1421         if (state & SFP_F_TX_DISABLE)
1422                 return;
1423
1424         sfp_set_state(sfp, state | SFP_F_TX_DISABLE);
1425
1426         udelay(T_RESET_US);
1427
1428         sfp_set_state(sfp, state);
1429 }
1430
1431 /* SFP state machine */
1432 static void sfp_sm_set_timer(struct sfp *sfp, unsigned int timeout)
1433 {
1434         if (timeout)
1435                 mod_delayed_work(system_power_efficient_wq, &sfp->timeout,
1436                                  timeout);
1437         else
1438                 cancel_delayed_work(&sfp->timeout);
1439 }
1440
1441 static void sfp_sm_next(struct sfp *sfp, unsigned int state,
1442                         unsigned int timeout)
1443 {
1444         sfp->sm_state = state;
1445         sfp_sm_set_timer(sfp, timeout);
1446 }
1447
1448 static void sfp_sm_mod_next(struct sfp *sfp, unsigned int state,
1449                             unsigned int timeout)
1450 {
1451         sfp->sm_mod_state = state;
1452         sfp_sm_set_timer(sfp, timeout);
1453 }
1454
1455 static void sfp_sm_phy_detach(struct sfp *sfp)
1456 {
1457         sfp_remove_phy(sfp->sfp_bus);
1458         phy_device_remove(sfp->mod_phy);
1459         phy_device_free(sfp->mod_phy);
1460         sfp->mod_phy = NULL;
1461 }
1462
1463 static int sfp_sm_probe_phy(struct sfp *sfp, bool is_c45)
1464 {
1465         struct phy_device *phy;
1466         int err;
1467
1468         phy = get_phy_device(sfp->i2c_mii, SFP_PHY_ADDR, is_c45);
1469         if (phy == ERR_PTR(-ENODEV))
1470                 return PTR_ERR(phy);
1471         if (IS_ERR(phy)) {
1472                 dev_err(sfp->dev, "mdiobus scan returned %pe\n", phy);
1473                 return PTR_ERR(phy);
1474         }
1475
1476         err = phy_device_register(phy);
1477         if (err) {
1478                 phy_device_free(phy);
1479                 dev_err(sfp->dev, "phy_device_register failed: %pe\n",
1480                         ERR_PTR(err));
1481                 return err;
1482         }
1483
1484         err = sfp_add_phy(sfp->sfp_bus, phy);
1485         if (err) {
1486                 phy_device_remove(phy);
1487                 phy_device_free(phy);
1488                 dev_err(sfp->dev, "sfp_add_phy failed: %pe\n", ERR_PTR(err));
1489                 return err;
1490         }
1491
1492         sfp->mod_phy = phy;
1493
1494         return 0;
1495 }
1496
1497 static void sfp_sm_link_up(struct sfp *sfp)
1498 {
1499         sfp_link_up(sfp->sfp_bus);
1500         sfp_sm_next(sfp, SFP_S_LINK_UP, 0);
1501 }
1502
1503 static void sfp_sm_link_down(struct sfp *sfp)
1504 {
1505         sfp_link_down(sfp->sfp_bus);
1506 }
1507
1508 static void sfp_sm_link_check_los(struct sfp *sfp)
1509 {
1510         const __be16 los_inverted = cpu_to_be16(SFP_OPTIONS_LOS_INVERTED);
1511         const __be16 los_normal = cpu_to_be16(SFP_OPTIONS_LOS_NORMAL);
1512         __be16 los_options = sfp->id.ext.options & (los_inverted | los_normal);
1513         bool los = false;
1514
1515         /* If neither SFP_OPTIONS_LOS_INVERTED nor SFP_OPTIONS_LOS_NORMAL
1516          * are set, we assume that no LOS signal is available. If both are
1517          * set, we assume LOS is not implemented (and is meaningless.)
1518          */
1519         if (los_options == los_inverted)
1520                 los = !(sfp->state & SFP_F_LOS);
1521         else if (los_options == los_normal)
1522                 los = !!(sfp->state & SFP_F_LOS);
1523
1524         if (los)
1525                 sfp_sm_next(sfp, SFP_S_WAIT_LOS, 0);
1526         else
1527                 sfp_sm_link_up(sfp);
1528 }
1529
1530 static bool sfp_los_event_active(struct sfp *sfp, unsigned int event)
1531 {
1532         const __be16 los_inverted = cpu_to_be16(SFP_OPTIONS_LOS_INVERTED);
1533         const __be16 los_normal = cpu_to_be16(SFP_OPTIONS_LOS_NORMAL);
1534         __be16 los_options = sfp->id.ext.options & (los_inverted | los_normal);
1535
1536         return (los_options == los_inverted && event == SFP_E_LOS_LOW) ||
1537                (los_options == los_normal && event == SFP_E_LOS_HIGH);
1538 }
1539
1540 static bool sfp_los_event_inactive(struct sfp *sfp, unsigned int event)
1541 {
1542         const __be16 los_inverted = cpu_to_be16(SFP_OPTIONS_LOS_INVERTED);
1543         const __be16 los_normal = cpu_to_be16(SFP_OPTIONS_LOS_NORMAL);
1544         __be16 los_options = sfp->id.ext.options & (los_inverted | los_normal);
1545
1546         return (los_options == los_inverted && event == SFP_E_LOS_HIGH) ||
1547                (los_options == los_normal && event == SFP_E_LOS_LOW);
1548 }
1549
1550 static void sfp_sm_fault(struct sfp *sfp, unsigned int next_state, bool warn)
1551 {
1552         if (sfp->sm_fault_retries && !--sfp->sm_fault_retries) {
1553                 dev_err(sfp->dev,
1554                         "module persistently indicates fault, disabling\n");
1555                 sfp_sm_next(sfp, SFP_S_TX_DISABLE, 0);
1556         } else {
1557                 if (warn)
1558                         dev_err(sfp->dev, "module transmit fault indicated\n");
1559
1560                 sfp_sm_next(sfp, next_state, T_FAULT_RECOVER);
1561         }
1562 }
1563
1564 /* Probe a SFP for a PHY device if the module supports copper - the PHY
1565  * normally sits at I2C bus address 0x56, and may either be a clause 22
1566  * or clause 45 PHY.
1567  *
1568  * Clause 22 copper SFP modules normally operate in Cisco SGMII mode with
1569  * negotiation enabled, but some may be in 1000base-X - which is for the
1570  * PHY driver to determine.
1571  *
1572  * Clause 45 copper SFP+ modules (10G) appear to switch their interface
1573  * mode according to the negotiated line speed.
1574  */
1575 static int sfp_sm_probe_for_phy(struct sfp *sfp)
1576 {
1577         int err = 0;
1578
1579         switch (sfp->id.base.extended_cc) {
1580         case SFF8024_ECC_10GBASE_T_SFI:
1581         case SFF8024_ECC_10GBASE_T_SR:
1582         case SFF8024_ECC_5GBASE_T:
1583         case SFF8024_ECC_2_5GBASE_T:
1584                 err = sfp_sm_probe_phy(sfp, true);
1585                 break;
1586
1587         default:
1588                 if (sfp->id.base.e1000_base_t)
1589                         err = sfp_sm_probe_phy(sfp, false);
1590                 break;
1591         }
1592         return err;
1593 }
1594
1595 static int sfp_module_parse_power(struct sfp *sfp)
1596 {
1597         u32 power_mW = 1000;
1598         bool supports_a2;
1599
1600         if (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_POWER_DECL))
1601                 power_mW = 1500;
1602         if (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_HIGH_POWER_LEVEL))
1603                 power_mW = 2000;
1604
1605         supports_a2 = sfp->id.ext.sff8472_compliance !=
1606                                 SFP_SFF8472_COMPLIANCE_NONE ||
1607                       sfp->id.ext.diagmon & SFP_DIAGMON_DDM;
1608
1609         if (power_mW > sfp->max_power_mW) {
1610                 /* Module power specification exceeds the allowed maximum. */
1611                 if (!supports_a2) {
1612                         /* The module appears not to implement bus address
1613                          * 0xa2, so assume that the module powers up in the
1614                          * indicated mode.
1615                          */
1616                         dev_err(sfp->dev,
1617                                 "Host does not support %u.%uW modules\n",
1618                                 power_mW / 1000, (power_mW / 100) % 10);
1619                         return -EINVAL;
1620                 } else {
1621                         dev_warn(sfp->dev,
1622                                  "Host does not support %u.%uW modules, module left in power mode 1\n",
1623                                  power_mW / 1000, (power_mW / 100) % 10);
1624                         return 0;
1625                 }
1626         }
1627
1628         if (power_mW <= 1000) {
1629                 /* Modules below 1W do not require a power change sequence */
1630                 sfp->module_power_mW = power_mW;
1631                 return 0;
1632         }
1633
1634         if (!supports_a2) {
1635                 /* The module power level is below the host maximum and the
1636                  * module appears not to implement bus address 0xa2, so assume
1637                  * that the module powers up in the indicated mode.
1638                  */
1639                 return 0;
1640         }
1641
1642         /* If the module requires a higher power mode, but also requires
1643          * an address change sequence, warn the user that the module may
1644          * not be functional.
1645          */
1646         if (sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE) {
1647                 dev_warn(sfp->dev,
1648                          "Address Change Sequence not supported but module requires %u.%uW, module may not be functional\n",
1649                          power_mW / 1000, (power_mW / 100) % 10);
1650                 return 0;
1651         }
1652
1653         sfp->module_power_mW = power_mW;
1654
1655         return 0;
1656 }
1657
1658 static int sfp_sm_mod_hpower(struct sfp *sfp, bool enable)
1659 {
1660         u8 val;
1661         int err;
1662
1663         err = sfp_read(sfp, true, SFP_EXT_STATUS, &val, sizeof(val));
1664         if (err != sizeof(val)) {
1665                 dev_err(sfp->dev, "Failed to read EEPROM: %pe\n", ERR_PTR(err));
1666                 return -EAGAIN;
1667         }
1668
1669         /* DM7052 reports as a high power module, responds to reads (with
1670          * all bytes 0xff) at 0x51 but does not accept writes.  In any case,
1671          * if the bit is already set, we're already in high power mode.
1672          */
1673         if (!!(val & BIT(0)) == enable)
1674                 return 0;
1675
1676         if (enable)
1677                 val |= BIT(0);
1678         else
1679                 val &= ~BIT(0);
1680
1681         err = sfp_write(sfp, true, SFP_EXT_STATUS, &val, sizeof(val));
1682         if (err != sizeof(val)) {
1683                 dev_err(sfp->dev, "Failed to write EEPROM: %pe\n",
1684                         ERR_PTR(err));
1685                 return -EAGAIN;
1686         }
1687
1688         if (enable)
1689                 dev_info(sfp->dev, "Module switched to %u.%uW power level\n",
1690                          sfp->module_power_mW / 1000,
1691                          (sfp->module_power_mW / 100) % 10);
1692
1693         return 0;
1694 }
1695
1696 /* GPON modules based on Realtek RTL8672 and RTL9601C chips (e.g. V-SOL
1697  * V2801F, CarlitoxxPro CPGOS03-0490, Ubiquiti U-Fiber Instant, ...) do
1698  * not support multibyte reads from the EEPROM. Each multi-byte read
1699  * operation returns just one byte of EEPROM followed by zeros. There is
1700  * no way to identify which modules are using Realtek RTL8672 and RTL9601C
1701  * chips. Moreover every OEM of V-SOL V2801F module puts its own vendor
1702  * name and vendor id into EEPROM, so there is even no way to detect if
1703  * module is V-SOL V2801F. Therefore check for those zeros in the read
1704  * data and then based on check switch to reading EEPROM to one byte
1705  * at a time.
1706  */
1707 static bool sfp_id_needs_byte_io(struct sfp *sfp, void *buf, size_t len)
1708 {
1709         size_t i, block_size = sfp->i2c_block_size;
1710
1711         /* Already using byte IO */
1712         if (block_size == 1)
1713                 return false;
1714
1715         for (i = 1; i < len; i += block_size) {
1716                 if (memchr_inv(buf + i, '\0', min(block_size - 1, len - i)))
1717                         return false;
1718         }
1719         return true;
1720 }
1721
1722 static int sfp_cotsworks_fixup_check(struct sfp *sfp, struct sfp_eeprom_id *id)
1723 {
1724         u8 check;
1725         int err;
1726
1727         if (id->base.phys_id != SFF8024_ID_SFF_8472 ||
1728             id->base.phys_ext_id != SFP_PHYS_EXT_ID_SFP ||
1729             id->base.connector != SFF8024_CONNECTOR_LC) {
1730                 dev_warn(sfp->dev, "Rewriting fiber module EEPROM with corrected values\n");
1731                 id->base.phys_id = SFF8024_ID_SFF_8472;
1732                 id->base.phys_ext_id = SFP_PHYS_EXT_ID_SFP;
1733                 id->base.connector = SFF8024_CONNECTOR_LC;
1734                 err = sfp_write(sfp, false, SFP_PHYS_ID, &id->base, 3);
1735                 if (err != 3) {
1736                         dev_err(sfp->dev,
1737                                 "Failed to rewrite module EEPROM: %pe\n",
1738                                 ERR_PTR(err));
1739                         return err;
1740                 }
1741
1742                 /* Cotsworks modules have been found to require a delay between write operations. */
1743                 mdelay(50);
1744
1745                 /* Update base structure checksum */
1746                 check = sfp_check(&id->base, sizeof(id->base) - 1);
1747                 err = sfp_write(sfp, false, SFP_CC_BASE, &check, 1);
1748                 if (err != 1) {
1749                         dev_err(sfp->dev,
1750                                 "Failed to update base structure checksum in fiber module EEPROM: %pe\n",
1751                                 ERR_PTR(err));
1752                         return err;
1753                 }
1754         }
1755         return 0;
1756 }
1757
1758 static int sfp_sm_mod_probe(struct sfp *sfp, bool report)
1759 {
1760         /* SFP module inserted - read I2C data */
1761         struct sfp_eeprom_id id;
1762         bool cotsworks_sfbg;
1763         bool cotsworks;
1764         u8 check;
1765         int ret;
1766
1767         /* Some SFP modules and also some Linux I2C drivers do not like reads
1768          * longer than 16 bytes, so read the EEPROM in chunks of 16 bytes at
1769          * a time.
1770          */
1771         sfp->i2c_block_size = 16;
1772
1773         ret = sfp_read(sfp, false, 0, &id.base, sizeof(id.base));
1774         if (ret < 0) {
1775                 if (report)
1776                         dev_err(sfp->dev, "failed to read EEPROM: %pe\n",
1777                                 ERR_PTR(ret));
1778                 return -EAGAIN;
1779         }
1780
1781         if (ret != sizeof(id.base)) {
1782                 dev_err(sfp->dev, "EEPROM short read: %pe\n", ERR_PTR(ret));
1783                 return -EAGAIN;
1784         }
1785
1786         /* Some SFP modules (e.g. Nokia 3FE46541AA) lock up if read from
1787          * address 0x51 is just one byte at a time. Also SFF-8472 requires
1788          * that EEPROM supports atomic 16bit read operation for diagnostic
1789          * fields, so do not switch to one byte reading at a time unless it
1790          * is really required and we have no other option.
1791          */
1792         if (sfp_id_needs_byte_io(sfp, &id.base, sizeof(id.base))) {
1793                 dev_info(sfp->dev,
1794                          "Detected broken RTL8672/RTL9601C emulated EEPROM\n");
1795                 dev_info(sfp->dev,
1796                          "Switching to reading EEPROM to one byte at a time\n");
1797                 sfp->i2c_block_size = 1;
1798
1799                 ret = sfp_read(sfp, false, 0, &id.base, sizeof(id.base));
1800                 if (ret < 0) {
1801                         if (report)
1802                                 dev_err(sfp->dev,
1803                                         "failed to read EEPROM: %pe\n",
1804                                         ERR_PTR(ret));
1805                         return -EAGAIN;
1806                 }
1807
1808                 if (ret != sizeof(id.base)) {
1809                         dev_err(sfp->dev, "EEPROM short read: %pe\n",
1810                                 ERR_PTR(ret));
1811                         return -EAGAIN;
1812                 }
1813         }
1814
1815         /* Cotsworks do not seem to update the checksums when they
1816          * do the final programming with the final module part number,
1817          * serial number and date code.
1818          */
1819         cotsworks = !memcmp(id.base.vendor_name, "COTSWORKS       ", 16);
1820         cotsworks_sfbg = !memcmp(id.base.vendor_pn, "SFBG", 4);
1821
1822         /* Cotsworks SFF module EEPROM do not always have valid phys_id,
1823          * phys_ext_id, and connector bytes.  Rewrite SFF EEPROM bytes if
1824          * Cotsworks PN matches and bytes are not correct.
1825          */
1826         if (cotsworks && cotsworks_sfbg) {
1827                 ret = sfp_cotsworks_fixup_check(sfp, &id);
1828                 if (ret < 0)
1829                         return ret;
1830         }
1831
1832         /* Validate the checksum over the base structure */
1833         check = sfp_check(&id.base, sizeof(id.base) - 1);
1834         if (check != id.base.cc_base) {
1835                 if (cotsworks) {
1836                         dev_warn(sfp->dev,
1837                                  "EEPROM base structure checksum failure (0x%02x != 0x%02x)\n",
1838                                  check, id.base.cc_base);
1839                 } else {
1840                         dev_err(sfp->dev,
1841                                 "EEPROM base structure checksum failure: 0x%02x != 0x%02x\n",
1842                                 check, id.base.cc_base);
1843                         print_hex_dump(KERN_ERR, "sfp EE: ", DUMP_PREFIX_OFFSET,
1844                                        16, 1, &id, sizeof(id), true);
1845                         return -EINVAL;
1846                 }
1847         }
1848
1849         ret = sfp_read(sfp, false, SFP_CC_BASE + 1, &id.ext, sizeof(id.ext));
1850         if (ret < 0) {
1851                 if (report)
1852                         dev_err(sfp->dev, "failed to read EEPROM: %pe\n",
1853                                 ERR_PTR(ret));
1854                 return -EAGAIN;
1855         }
1856
1857         if (ret != sizeof(id.ext)) {
1858                 dev_err(sfp->dev, "EEPROM short read: %pe\n", ERR_PTR(ret));
1859                 return -EAGAIN;
1860         }
1861
1862         check = sfp_check(&id.ext, sizeof(id.ext) - 1);
1863         if (check != id.ext.cc_ext) {
1864                 if (cotsworks) {
1865                         dev_warn(sfp->dev,
1866                                  "EEPROM extended structure checksum failure (0x%02x != 0x%02x)\n",
1867                                  check, id.ext.cc_ext);
1868                 } else {
1869                         dev_err(sfp->dev,
1870                                 "EEPROM extended structure checksum failure: 0x%02x != 0x%02x\n",
1871                                 check, id.ext.cc_ext);
1872                         print_hex_dump(KERN_ERR, "sfp EE: ", DUMP_PREFIX_OFFSET,
1873                                        16, 1, &id, sizeof(id), true);
1874                         memset(&id.ext, 0, sizeof(id.ext));
1875                 }
1876         }
1877
1878         sfp->id = id;
1879
1880         dev_info(sfp->dev, "module %.*s %.*s rev %.*s sn %.*s dc %.*s\n",
1881                  (int)sizeof(id.base.vendor_name), id.base.vendor_name,
1882                  (int)sizeof(id.base.vendor_pn), id.base.vendor_pn,
1883                  (int)sizeof(id.base.vendor_rev), id.base.vendor_rev,
1884                  (int)sizeof(id.ext.vendor_sn), id.ext.vendor_sn,
1885                  (int)sizeof(id.ext.datecode), id.ext.datecode);
1886
1887         /* Check whether we support this module */
1888         if (!sfp->type->module_supported(&id)) {
1889                 dev_err(sfp->dev,
1890                         "module is not supported - phys id 0x%02x 0x%02x\n",
1891                         sfp->id.base.phys_id, sfp->id.base.phys_ext_id);
1892                 return -EINVAL;
1893         }
1894
1895         /* If the module requires address swap mode, warn about it */
1896         if (sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE)
1897                 dev_warn(sfp->dev,
1898                          "module address swap to access page 0xA2 is not supported.\n");
1899
1900         /* Parse the module power requirement */
1901         ret = sfp_module_parse_power(sfp);
1902         if (ret < 0)
1903                 return ret;
1904
1905         if (!memcmp(id.base.vendor_name, "ALCATELLUCENT   ", 16) &&
1906             !memcmp(id.base.vendor_pn, "3FE46541AA      ", 16))
1907                 sfp->module_t_start_up = T_START_UP_BAD_GPON;
1908         else
1909                 sfp->module_t_start_up = T_START_UP;
1910
1911         if (!memcmp(id.base.vendor_name, "HUAWEI          ", 16) &&
1912             !memcmp(id.base.vendor_pn, "MA5671A         ", 16))
1913                 sfp->tx_fault_ignore = true;
1914         else
1915                 sfp->tx_fault_ignore = false;
1916
1917         return 0;
1918 }
1919
1920 static void sfp_sm_mod_remove(struct sfp *sfp)
1921 {
1922         if (sfp->sm_mod_state > SFP_MOD_WAITDEV)
1923                 sfp_module_remove(sfp->sfp_bus);
1924
1925         sfp_hwmon_remove(sfp);
1926
1927         memset(&sfp->id, 0, sizeof(sfp->id));
1928         sfp->module_power_mW = 0;
1929
1930         dev_info(sfp->dev, "module removed\n");
1931 }
1932
1933 /* This state machine tracks the upstream's state */
1934 static void sfp_sm_device(struct sfp *sfp, unsigned int event)
1935 {
1936         switch (sfp->sm_dev_state) {
1937         default:
1938                 if (event == SFP_E_DEV_ATTACH)
1939                         sfp->sm_dev_state = SFP_DEV_DOWN;
1940                 break;
1941
1942         case SFP_DEV_DOWN:
1943                 if (event == SFP_E_DEV_DETACH)
1944                         sfp->sm_dev_state = SFP_DEV_DETACHED;
1945                 else if (event == SFP_E_DEV_UP)
1946                         sfp->sm_dev_state = SFP_DEV_UP;
1947                 break;
1948
1949         case SFP_DEV_UP:
1950                 if (event == SFP_E_DEV_DETACH)
1951                         sfp->sm_dev_state = SFP_DEV_DETACHED;
1952                 else if (event == SFP_E_DEV_DOWN)
1953                         sfp->sm_dev_state = SFP_DEV_DOWN;
1954                 break;
1955         }
1956 }
1957
1958 /* This state machine tracks the insert/remove state of the module, probes
1959  * the on-board EEPROM, and sets up the power level.
1960  */
1961 static void sfp_sm_module(struct sfp *sfp, unsigned int event)
1962 {
1963         int err;
1964
1965         /* Handle remove event globally, it resets this state machine */
1966         if (event == SFP_E_REMOVE) {
1967                 if (sfp->sm_mod_state > SFP_MOD_PROBE)
1968                         sfp_sm_mod_remove(sfp);
1969                 sfp_sm_mod_next(sfp, SFP_MOD_EMPTY, 0);
1970                 return;
1971         }
1972
1973         /* Handle device detach globally */
1974         if (sfp->sm_dev_state < SFP_DEV_DOWN &&
1975             sfp->sm_mod_state > SFP_MOD_WAITDEV) {
1976                 if (sfp->module_power_mW > 1000 &&
1977                     sfp->sm_mod_state > SFP_MOD_HPOWER)
1978                         sfp_sm_mod_hpower(sfp, false);
1979                 sfp_sm_mod_next(sfp, SFP_MOD_WAITDEV, 0);
1980                 return;
1981         }
1982
1983         switch (sfp->sm_mod_state) {
1984         default:
1985                 if (event == SFP_E_INSERT) {
1986                         sfp_sm_mod_next(sfp, SFP_MOD_PROBE, T_SERIAL);
1987                         sfp->sm_mod_tries_init = R_PROBE_RETRY_INIT;
1988                         sfp->sm_mod_tries = R_PROBE_RETRY_SLOW;
1989                 }
1990                 break;
1991
1992         case SFP_MOD_PROBE:
1993                 /* Wait for T_PROBE_INIT to time out */
1994                 if (event != SFP_E_TIMEOUT)
1995                         break;
1996
1997                 err = sfp_sm_mod_probe(sfp, sfp->sm_mod_tries == 1);
1998                 if (err == -EAGAIN) {
1999                         if (sfp->sm_mod_tries_init &&
2000                            --sfp->sm_mod_tries_init) {
2001                                 sfp_sm_set_timer(sfp, T_PROBE_RETRY_INIT);
2002                                 break;
2003                         } else if (sfp->sm_mod_tries && --sfp->sm_mod_tries) {
2004                                 if (sfp->sm_mod_tries == R_PROBE_RETRY_SLOW - 1)
2005                                         dev_warn(sfp->dev,
2006                                                  "please wait, module slow to respond\n");
2007                                 sfp_sm_set_timer(sfp, T_PROBE_RETRY_SLOW);
2008                                 break;
2009                         }
2010                 }
2011                 if (err < 0) {
2012                         sfp_sm_mod_next(sfp, SFP_MOD_ERROR, 0);
2013                         break;
2014                 }
2015
2016                 err = sfp_hwmon_insert(sfp);
2017                 if (err)
2018                         dev_warn(sfp->dev, "hwmon probe failed: %pe\n",
2019                                  ERR_PTR(err));
2020
2021                 sfp_sm_mod_next(sfp, SFP_MOD_WAITDEV, 0);
2022                 fallthrough;
2023         case SFP_MOD_WAITDEV:
2024                 /* Ensure that the device is attached before proceeding */
2025                 if (sfp->sm_dev_state < SFP_DEV_DOWN)
2026                         break;
2027
2028                 /* Report the module insertion to the upstream device */
2029                 err = sfp_module_insert(sfp->sfp_bus, &sfp->id);
2030                 if (err < 0) {
2031                         sfp_sm_mod_next(sfp, SFP_MOD_ERROR, 0);
2032                         break;
2033                 }
2034
2035                 /* If this is a power level 1 module, we are done */
2036                 if (sfp->module_power_mW <= 1000)
2037                         goto insert;
2038
2039                 sfp_sm_mod_next(sfp, SFP_MOD_HPOWER, 0);
2040                 fallthrough;
2041         case SFP_MOD_HPOWER:
2042                 /* Enable high power mode */
2043                 err = sfp_sm_mod_hpower(sfp, true);
2044                 if (err < 0) {
2045                         if (err != -EAGAIN) {
2046                                 sfp_module_remove(sfp->sfp_bus);
2047                                 sfp_sm_mod_next(sfp, SFP_MOD_ERROR, 0);
2048                         } else {
2049                                 sfp_sm_set_timer(sfp, T_PROBE_RETRY_INIT);
2050                         }
2051                         break;
2052                 }
2053
2054                 sfp_sm_mod_next(sfp, SFP_MOD_WAITPWR, T_HPOWER_LEVEL);
2055                 break;
2056
2057         case SFP_MOD_WAITPWR:
2058                 /* Wait for T_HPOWER_LEVEL to time out */
2059                 if (event != SFP_E_TIMEOUT)
2060                         break;
2061
2062         insert:
2063                 sfp_sm_mod_next(sfp, SFP_MOD_PRESENT, 0);
2064                 break;
2065
2066         case SFP_MOD_PRESENT:
2067         case SFP_MOD_ERROR:
2068                 break;
2069         }
2070 }
2071
2072 static void sfp_sm_main(struct sfp *sfp, unsigned int event)
2073 {
2074         unsigned long timeout;
2075         int ret;
2076
2077         /* Some events are global */
2078         if (sfp->sm_state != SFP_S_DOWN &&
2079             (sfp->sm_mod_state != SFP_MOD_PRESENT ||
2080              sfp->sm_dev_state != SFP_DEV_UP)) {
2081                 if (sfp->sm_state == SFP_S_LINK_UP &&
2082                     sfp->sm_dev_state == SFP_DEV_UP)
2083                         sfp_sm_link_down(sfp);
2084                 if (sfp->sm_state > SFP_S_INIT)
2085                         sfp_module_stop(sfp->sfp_bus);
2086                 if (sfp->mod_phy)
2087                         sfp_sm_phy_detach(sfp);
2088                 sfp_module_tx_disable(sfp);
2089                 sfp_soft_stop_poll(sfp);
2090                 sfp_sm_next(sfp, SFP_S_DOWN, 0);
2091                 return;
2092         }
2093
2094         /* The main state machine */
2095         switch (sfp->sm_state) {
2096         case SFP_S_DOWN:
2097                 if (sfp->sm_mod_state != SFP_MOD_PRESENT ||
2098                     sfp->sm_dev_state != SFP_DEV_UP)
2099                         break;
2100
2101                 if (!(sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE))
2102                         sfp_soft_start_poll(sfp);
2103
2104                 sfp_module_tx_enable(sfp);
2105
2106                 /* Initialise the fault clearance retries */
2107                 sfp->sm_fault_retries = N_FAULT_INIT;
2108
2109                 /* We need to check the TX_FAULT state, which is not defined
2110                  * while TX_DISABLE is asserted. The earliest we want to do
2111                  * anything (such as probe for a PHY) is 50ms.
2112                  */
2113                 sfp_sm_next(sfp, SFP_S_WAIT, T_WAIT);
2114                 break;
2115
2116         case SFP_S_WAIT:
2117                 if (event != SFP_E_TIMEOUT)
2118                         break;
2119
2120                 if (sfp->state & SFP_F_TX_FAULT) {
2121                         /* Wait up to t_init (SFF-8472) or t_start_up (SFF-8431)
2122                          * from the TX_DISABLE deassertion for the module to
2123                          * initialise, which is indicated by TX_FAULT
2124                          * deasserting.
2125                          */
2126                         timeout = sfp->module_t_start_up;
2127                         if (timeout > T_WAIT)
2128                                 timeout -= T_WAIT;
2129                         else
2130                                 timeout = 1;
2131
2132                         sfp_sm_next(sfp, SFP_S_INIT, timeout);
2133                 } else {
2134                         /* TX_FAULT is not asserted, assume the module has
2135                          * finished initialising.
2136                          */
2137                         goto init_done;
2138                 }
2139                 break;
2140
2141         case SFP_S_INIT:
2142                 if (event == SFP_E_TIMEOUT && sfp->state & SFP_F_TX_FAULT) {
2143                         /* TX_FAULT is still asserted after t_init
2144                          * or t_start_up, so assume there is a fault.
2145                          */
2146                         sfp_sm_fault(sfp, SFP_S_INIT_TX_FAULT,
2147                                      sfp->sm_fault_retries == N_FAULT_INIT);
2148                 } else if (event == SFP_E_TIMEOUT || event == SFP_E_TX_CLEAR) {
2149         init_done:
2150                         sfp->sm_phy_retries = R_PHY_RETRY;
2151                         goto phy_probe;
2152                 }
2153                 break;
2154
2155         case SFP_S_INIT_PHY:
2156                 if (event != SFP_E_TIMEOUT)
2157                         break;
2158         phy_probe:
2159                 /* TX_FAULT deasserted or we timed out with TX_FAULT
2160                  * clear.  Probe for the PHY and check the LOS state.
2161                  */
2162                 ret = sfp_sm_probe_for_phy(sfp);
2163                 if (ret == -ENODEV) {
2164                         if (--sfp->sm_phy_retries) {
2165                                 sfp_sm_next(sfp, SFP_S_INIT_PHY, T_PHY_RETRY);
2166                                 break;
2167                         } else {
2168                                 dev_info(sfp->dev, "no PHY detected\n");
2169                         }
2170                 } else if (ret) {
2171                         sfp_sm_next(sfp, SFP_S_FAIL, 0);
2172                         break;
2173                 }
2174                 if (sfp_module_start(sfp->sfp_bus)) {
2175                         sfp_sm_next(sfp, SFP_S_FAIL, 0);
2176                         break;
2177                 }
2178                 sfp_sm_link_check_los(sfp);
2179
2180                 /* Reset the fault retry count */
2181                 sfp->sm_fault_retries = N_FAULT;
2182                 break;
2183
2184         case SFP_S_INIT_TX_FAULT:
2185                 if (event == SFP_E_TIMEOUT) {
2186                         sfp_module_tx_fault_reset(sfp);
2187                         sfp_sm_next(sfp, SFP_S_INIT, sfp->module_t_start_up);
2188                 }
2189                 break;
2190
2191         case SFP_S_WAIT_LOS:
2192                 if (event == SFP_E_TX_FAULT)
2193                         sfp_sm_fault(sfp, SFP_S_TX_FAULT, true);
2194                 else if (sfp_los_event_inactive(sfp, event))
2195                         sfp_sm_link_up(sfp);
2196                 break;
2197
2198         case SFP_S_LINK_UP:
2199                 if (event == SFP_E_TX_FAULT) {
2200                         sfp_sm_link_down(sfp);
2201                         sfp_sm_fault(sfp, SFP_S_TX_FAULT, true);
2202                 } else if (sfp_los_event_active(sfp, event)) {
2203                         sfp_sm_link_down(sfp);
2204                         sfp_sm_next(sfp, SFP_S_WAIT_LOS, 0);
2205                 }
2206                 break;
2207
2208         case SFP_S_TX_FAULT:
2209                 if (event == SFP_E_TIMEOUT) {
2210                         sfp_module_tx_fault_reset(sfp);
2211                         sfp_sm_next(sfp, SFP_S_REINIT, sfp->module_t_start_up);
2212                 }
2213                 break;
2214
2215         case SFP_S_REINIT:
2216                 if (event == SFP_E_TIMEOUT && sfp->state & SFP_F_TX_FAULT) {
2217                         sfp_sm_fault(sfp, SFP_S_TX_FAULT, false);
2218                 } else if (event == SFP_E_TIMEOUT || event == SFP_E_TX_CLEAR) {
2219                         dev_info(sfp->dev, "module transmit fault recovered\n");
2220                         sfp_sm_link_check_los(sfp);
2221                 }
2222                 break;
2223
2224         case SFP_S_TX_DISABLE:
2225                 break;
2226         }
2227 }
2228
2229 static void sfp_sm_event(struct sfp *sfp, unsigned int event)
2230 {
2231         mutex_lock(&sfp->sm_mutex);
2232
2233         dev_dbg(sfp->dev, "SM: enter %s:%s:%s event %s\n",
2234                 mod_state_to_str(sfp->sm_mod_state),
2235                 dev_state_to_str(sfp->sm_dev_state),
2236                 sm_state_to_str(sfp->sm_state),
2237                 event_to_str(event));
2238
2239         sfp_sm_device(sfp, event);
2240         sfp_sm_module(sfp, event);
2241         sfp_sm_main(sfp, event);
2242
2243         dev_dbg(sfp->dev, "SM: exit %s:%s:%s\n",
2244                 mod_state_to_str(sfp->sm_mod_state),
2245                 dev_state_to_str(sfp->sm_dev_state),
2246                 sm_state_to_str(sfp->sm_state));
2247
2248         mutex_unlock(&sfp->sm_mutex);
2249 }
2250
2251 static void sfp_attach(struct sfp *sfp)
2252 {
2253         sfp_sm_event(sfp, SFP_E_DEV_ATTACH);
2254 }
2255
2256 static void sfp_detach(struct sfp *sfp)
2257 {
2258         sfp_sm_event(sfp, SFP_E_DEV_DETACH);
2259 }
2260
2261 static void sfp_start(struct sfp *sfp)
2262 {
2263         sfp_sm_event(sfp, SFP_E_DEV_UP);
2264 }
2265
2266 static void sfp_stop(struct sfp *sfp)
2267 {
2268         sfp_sm_event(sfp, SFP_E_DEV_DOWN);
2269 }
2270
2271 static int sfp_module_info(struct sfp *sfp, struct ethtool_modinfo *modinfo)
2272 {
2273         /* locking... and check module is present */
2274
2275         if (sfp->id.ext.sff8472_compliance &&
2276             !(sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE)) {
2277                 modinfo->type = ETH_MODULE_SFF_8472;
2278                 modinfo->eeprom_len = ETH_MODULE_SFF_8472_LEN;
2279         } else {
2280                 modinfo->type = ETH_MODULE_SFF_8079;
2281                 modinfo->eeprom_len = ETH_MODULE_SFF_8079_LEN;
2282         }
2283         return 0;
2284 }
2285
2286 static int sfp_module_eeprom(struct sfp *sfp, struct ethtool_eeprom *ee,
2287                              u8 *data)
2288 {
2289         unsigned int first, last, len;
2290         int ret;
2291
2292         if (ee->len == 0)
2293                 return -EINVAL;
2294
2295         first = ee->offset;
2296         last = ee->offset + ee->len;
2297         if (first < ETH_MODULE_SFF_8079_LEN) {
2298                 len = min_t(unsigned int, last, ETH_MODULE_SFF_8079_LEN);
2299                 len -= first;
2300
2301                 ret = sfp_read(sfp, false, first, data, len);
2302                 if (ret < 0)
2303                         return ret;
2304
2305                 first += len;
2306                 data += len;
2307         }
2308         if (first < ETH_MODULE_SFF_8472_LEN && last > ETH_MODULE_SFF_8079_LEN) {
2309                 len = min_t(unsigned int, last, ETH_MODULE_SFF_8472_LEN);
2310                 len -= first;
2311                 first -= ETH_MODULE_SFF_8079_LEN;
2312
2313                 ret = sfp_read(sfp, true, first, data, len);
2314                 if (ret < 0)
2315                         return ret;
2316         }
2317         return 0;
2318 }
2319
2320 static int sfp_module_eeprom_by_page(struct sfp *sfp,
2321                                      const struct ethtool_module_eeprom *page,
2322                                      struct netlink_ext_ack *extack)
2323 {
2324         if (page->bank) {
2325                 NL_SET_ERR_MSG(extack, "Banks not supported");
2326                 return -EOPNOTSUPP;
2327         }
2328
2329         if (page->page) {
2330                 NL_SET_ERR_MSG(extack, "Only page 0 supported");
2331                 return -EOPNOTSUPP;
2332         }
2333
2334         if (page->i2c_address != 0x50 &&
2335             page->i2c_address != 0x51) {
2336                 NL_SET_ERR_MSG(extack, "Only address 0x50 and 0x51 supported");
2337                 return -EOPNOTSUPP;
2338         }
2339
2340         return sfp_read(sfp, page->i2c_address == 0x51, page->offset,
2341                         page->data, page->length);
2342 };
2343
2344 static const struct sfp_socket_ops sfp_module_ops = {
2345         .attach = sfp_attach,
2346         .detach = sfp_detach,
2347         .start = sfp_start,
2348         .stop = sfp_stop,
2349         .module_info = sfp_module_info,
2350         .module_eeprom = sfp_module_eeprom,
2351         .module_eeprom_by_page = sfp_module_eeprom_by_page,
2352 };
2353
2354 static void sfp_timeout(struct work_struct *work)
2355 {
2356         struct sfp *sfp = container_of(work, struct sfp, timeout.work);
2357
2358         rtnl_lock();
2359         sfp_sm_event(sfp, SFP_E_TIMEOUT);
2360         rtnl_unlock();
2361 }
2362
2363 static void sfp_check_state(struct sfp *sfp)
2364 {
2365         unsigned int state, i, changed;
2366
2367         mutex_lock(&sfp->st_mutex);
2368         state = sfp_get_state(sfp);
2369         changed = state ^ sfp->state;
2370         if (sfp->tx_fault_ignore)
2371                 changed &= SFP_F_PRESENT | SFP_F_LOS;
2372         else
2373                 changed &= SFP_F_PRESENT | SFP_F_LOS | SFP_F_TX_FAULT;
2374
2375         for (i = 0; i < GPIO_MAX; i++)
2376                 if (changed & BIT(i))
2377                         dev_dbg(sfp->dev, "%s %u -> %u\n", gpio_of_names[i],
2378                                 !!(sfp->state & BIT(i)), !!(state & BIT(i)));
2379
2380         state |= sfp->state & (SFP_F_TX_DISABLE | SFP_F_RATE_SELECT);
2381         sfp->state = state;
2382
2383         rtnl_lock();
2384         if (changed & SFP_F_PRESENT)
2385                 sfp_sm_event(sfp, state & SFP_F_PRESENT ?
2386                                 SFP_E_INSERT : SFP_E_REMOVE);
2387
2388         if (changed & SFP_F_TX_FAULT)
2389                 sfp_sm_event(sfp, state & SFP_F_TX_FAULT ?
2390                                 SFP_E_TX_FAULT : SFP_E_TX_CLEAR);
2391
2392         if (changed & SFP_F_LOS)
2393                 sfp_sm_event(sfp, state & SFP_F_LOS ?
2394                                 SFP_E_LOS_HIGH : SFP_E_LOS_LOW);
2395         rtnl_unlock();
2396         mutex_unlock(&sfp->st_mutex);
2397 }
2398
2399 static irqreturn_t sfp_irq(int irq, void *data)
2400 {
2401         struct sfp *sfp = data;
2402
2403         sfp_check_state(sfp);
2404
2405         return IRQ_HANDLED;
2406 }
2407
2408 static void sfp_poll(struct work_struct *work)
2409 {
2410         struct sfp *sfp = container_of(work, struct sfp, poll.work);
2411
2412         sfp_check_state(sfp);
2413
2414         if (sfp->state_soft_mask & (SFP_F_LOS | SFP_F_TX_FAULT) ||
2415             sfp->need_poll)
2416                 mod_delayed_work(system_wq, &sfp->poll, poll_jiffies);
2417 }
2418
2419 static struct sfp *sfp_alloc(struct device *dev)
2420 {
2421         struct sfp *sfp;
2422
2423         sfp = kzalloc(sizeof(*sfp), GFP_KERNEL);
2424         if (!sfp)
2425                 return ERR_PTR(-ENOMEM);
2426
2427         sfp->dev = dev;
2428
2429         mutex_init(&sfp->sm_mutex);
2430         mutex_init(&sfp->st_mutex);
2431         INIT_DELAYED_WORK(&sfp->poll, sfp_poll);
2432         INIT_DELAYED_WORK(&sfp->timeout, sfp_timeout);
2433
2434         sfp_hwmon_init(sfp);
2435
2436         return sfp;
2437 }
2438
2439 static void sfp_cleanup(void *data)
2440 {
2441         struct sfp *sfp = data;
2442
2443         sfp_hwmon_exit(sfp);
2444
2445         cancel_delayed_work_sync(&sfp->poll);
2446         cancel_delayed_work_sync(&sfp->timeout);
2447         if (sfp->i2c_mii) {
2448                 mdiobus_unregister(sfp->i2c_mii);
2449                 mdiobus_free(sfp->i2c_mii);
2450         }
2451         if (sfp->i2c)
2452                 i2c_put_adapter(sfp->i2c);
2453         kfree(sfp);
2454 }
2455
2456 static int sfp_probe(struct platform_device *pdev)
2457 {
2458         const struct sff_data *sff;
2459         struct i2c_adapter *i2c;
2460         char *sfp_irq_name;
2461         struct sfp *sfp;
2462         int err, i;
2463
2464         sfp = sfp_alloc(&pdev->dev);
2465         if (IS_ERR(sfp))
2466                 return PTR_ERR(sfp);
2467
2468         platform_set_drvdata(pdev, sfp);
2469
2470         err = devm_add_action_or_reset(sfp->dev, sfp_cleanup, sfp);
2471         if (err < 0)
2472                 return err;
2473
2474         sff = sfp->type = &sfp_data;
2475
2476         if (pdev->dev.of_node) {
2477                 struct device_node *node = pdev->dev.of_node;
2478                 const struct of_device_id *id;
2479                 struct device_node *np;
2480
2481                 id = of_match_node(sfp_of_match, node);
2482                 if (WARN_ON(!id))
2483                         return -EINVAL;
2484
2485                 sff = sfp->type = id->data;
2486
2487                 np = of_parse_phandle(node, "i2c-bus", 0);
2488                 if (!np) {
2489                         dev_err(sfp->dev, "missing 'i2c-bus' property\n");
2490                         return -ENODEV;
2491                 }
2492
2493                 i2c = of_find_i2c_adapter_by_node(np);
2494                 of_node_put(np);
2495         } else if (has_acpi_companion(&pdev->dev)) {
2496                 struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
2497                 struct fwnode_handle *fw = acpi_fwnode_handle(adev);
2498                 struct fwnode_reference_args args;
2499                 struct acpi_handle *acpi_handle;
2500                 int ret;
2501
2502                 ret = acpi_node_get_property_reference(fw, "i2c-bus", 0, &args);
2503                 if (ret || !is_acpi_device_node(args.fwnode)) {
2504                         dev_err(&pdev->dev, "missing 'i2c-bus' property\n");
2505                         return -ENODEV;
2506                 }
2507
2508                 acpi_handle = ACPI_HANDLE_FWNODE(args.fwnode);
2509                 i2c = i2c_acpi_find_adapter_by_handle(acpi_handle);
2510         } else {
2511                 return -EINVAL;
2512         }
2513
2514         if (!i2c)
2515                 return -EPROBE_DEFER;
2516
2517         err = sfp_i2c_configure(sfp, i2c);
2518         if (err < 0) {
2519                 i2c_put_adapter(i2c);
2520                 return err;
2521         }
2522
2523         for (i = 0; i < GPIO_MAX; i++)
2524                 if (sff->gpios & BIT(i)) {
2525                         sfp->gpio[i] = devm_gpiod_get_optional(sfp->dev,
2526                                            gpio_of_names[i], gpio_flags[i]);
2527                         if (IS_ERR(sfp->gpio[i]))
2528                                 return PTR_ERR(sfp->gpio[i]);
2529                 }
2530
2531         sfp->get_state = sfp_gpio_get_state;
2532         sfp->set_state = sfp_gpio_set_state;
2533
2534         /* Modules that have no detect signal are always present */
2535         if (!(sfp->gpio[GPIO_MODDEF0]))
2536                 sfp->get_state = sff_gpio_get_state;
2537
2538         device_property_read_u32(&pdev->dev, "maximum-power-milliwatt",
2539                                  &sfp->max_power_mW);
2540         if (!sfp->max_power_mW)
2541                 sfp->max_power_mW = 1000;
2542
2543         dev_info(sfp->dev, "Host maximum power %u.%uW\n",
2544                  sfp->max_power_mW / 1000, (sfp->max_power_mW / 100) % 10);
2545
2546         /* Get the initial state, and always signal TX disable,
2547          * since the network interface will not be up.
2548          */
2549         sfp->state = sfp_get_state(sfp) | SFP_F_TX_DISABLE;
2550
2551         if (sfp->gpio[GPIO_RATE_SELECT] &&
2552             gpiod_get_value_cansleep(sfp->gpio[GPIO_RATE_SELECT]))
2553                 sfp->state |= SFP_F_RATE_SELECT;
2554         sfp_set_state(sfp, sfp->state);
2555         sfp_module_tx_disable(sfp);
2556         if (sfp->state & SFP_F_PRESENT) {
2557                 rtnl_lock();
2558                 sfp_sm_event(sfp, SFP_E_INSERT);
2559                 rtnl_unlock();
2560         }
2561
2562         for (i = 0; i < GPIO_MAX; i++) {
2563                 if (gpio_flags[i] != GPIOD_IN || !sfp->gpio[i])
2564                         continue;
2565
2566                 sfp->gpio_irq[i] = gpiod_to_irq(sfp->gpio[i]);
2567                 if (sfp->gpio_irq[i] < 0) {
2568                         sfp->gpio_irq[i] = 0;
2569                         sfp->need_poll = true;
2570                         continue;
2571                 }
2572
2573                 sfp_irq_name = devm_kasprintf(sfp->dev, GFP_KERNEL,
2574                                               "%s-%s", dev_name(sfp->dev),
2575                                               gpio_of_names[i]);
2576
2577                 if (!sfp_irq_name)
2578                         return -ENOMEM;
2579
2580                 err = devm_request_threaded_irq(sfp->dev, sfp->gpio_irq[i],
2581                                                 NULL, sfp_irq,
2582                                                 IRQF_ONESHOT |
2583                                                 IRQF_TRIGGER_RISING |
2584                                                 IRQF_TRIGGER_FALLING,
2585                                                 sfp_irq_name, sfp);
2586                 if (err) {
2587                         sfp->gpio_irq[i] = 0;
2588                         sfp->need_poll = true;
2589                 }
2590         }
2591
2592         if (sfp->need_poll)
2593                 mod_delayed_work(system_wq, &sfp->poll, poll_jiffies);
2594
2595         /* We could have an issue in cases no Tx disable pin is available or
2596          * wired as modules using a laser as their light source will continue to
2597          * be active when the fiber is removed. This could be a safety issue and
2598          * we should at least warn the user about that.
2599          */
2600         if (!sfp->gpio[GPIO_TX_DISABLE])
2601                 dev_warn(sfp->dev,
2602                          "No tx_disable pin: SFP modules will always be emitting.\n");
2603
2604         sfp->sfp_bus = sfp_register_socket(sfp->dev, sfp, &sfp_module_ops);
2605         if (!sfp->sfp_bus)
2606                 return -ENOMEM;
2607
2608         sfp_debugfs_init(sfp);
2609
2610         return 0;
2611 }
2612
2613 static int sfp_remove(struct platform_device *pdev)
2614 {
2615         struct sfp *sfp = platform_get_drvdata(pdev);
2616
2617         sfp_debugfs_exit(sfp);
2618         sfp_unregister_socket(sfp->sfp_bus);
2619
2620         rtnl_lock();
2621         sfp_sm_event(sfp, SFP_E_REMOVE);
2622         rtnl_unlock();
2623
2624         return 0;
2625 }
2626
2627 static void sfp_shutdown(struct platform_device *pdev)
2628 {
2629         struct sfp *sfp = platform_get_drvdata(pdev);
2630         int i;
2631
2632         for (i = 0; i < GPIO_MAX; i++) {
2633                 if (!sfp->gpio_irq[i])
2634                         continue;
2635
2636                 devm_free_irq(sfp->dev, sfp->gpio_irq[i], sfp);
2637         }
2638
2639         cancel_delayed_work_sync(&sfp->poll);
2640         cancel_delayed_work_sync(&sfp->timeout);
2641 }
2642
2643 static struct platform_driver sfp_driver = {
2644         .probe = sfp_probe,
2645         .remove = sfp_remove,
2646         .shutdown = sfp_shutdown,
2647         .driver = {
2648                 .name = "sfp",
2649                 .of_match_table = sfp_of_match,
2650         },
2651 };
2652
2653 static int sfp_init(void)
2654 {
2655         poll_jiffies = msecs_to_jiffies(100);
2656
2657         return platform_driver_register(&sfp_driver);
2658 }
2659 module_init(sfp_init);
2660
2661 static void sfp_exit(void)
2662 {
2663         platform_driver_unregister(&sfp_driver);
2664 }
2665 module_exit(sfp_exit);
2666
2667 MODULE_ALIAS("platform:sfp");
2668 MODULE_AUTHOR("Russell King");
2669 MODULE_LICENSE("GPL v2");