drivers/mfd/twl-core.c

   1 /*
   2  * twl_core.c - driver for TWL4030/TWL5030/TWL60X0/TPS659x0 PM
   3  * and audio CODEC devices
   4  *
   5  * Copyright (C) 2005-2006 Texas Instruments, Inc.
   6  *
   7  * Modifications to defer interrupt handling to a kernel thread:
   8  * Copyright (C) 2006 MontaVista Software, Inc.
   9  *
  10  * Based on tlv320aic23.c:
  11  * Copyright (c) by Kai Svahn <kai.svahn@nokia.com>
  12  *
  13  * Code cleanup and modifications to IRQ handler.
  14  * by syed khasim <x0khasim@ti.com>
  15  *
  16  * This program is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License as published by
  18  * the Free Software Foundation; either version 2 of the License, or
  19  * (at your option) any later version.
  20  *
  21  * This program is distributed in the hope that it will be useful,
  22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  * GNU General Public License for more details.
  25  *
  26  * You should have received a copy of the GNU General Public License
  27  * along with this program; if not, write to the Free Software
  28  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  29  */
  30
  31 #include <linux/init.h>
  32 #include <linux/mutex.h>
  33 #include <linux/module.h>
  34 #include <linux/platform_device.h>
  35 #include <linux/regmap.h>
  36 #include <linux/clk.h>
  37 #include <linux/err.h>
  38 #include <linux/device.h>
  39 #include <linux/of.h>
  40 #include <linux/of_irq.h>
  41 #include <linux/of_platform.h>
  42 #include <linux/irq.h>
  43 #include <linux/irqdomain.h>
  44
  45 #include <linux/regulator/machine.h>
  46
  47 #include <linux/i2c.h>
  48 #include <linux/i2c/twl.h>
  49
  50 #include "twl-core.h"
  51
  52 /*
  53  * The TWL4030 "Triton 2" is one of a family of a multi-function "Power
  54  * Management and System Companion Device" chips originally designed for
  55  * use in OMAP2 and OMAP 3 based systems.  Its control interfaces use I2C,
  56  * often at around 3 Mbit/sec, including for interrupt handling.
  57  *
  58  * This driver core provides genirq support for the interrupts emitted,
  59  * by the various modules, and exports register access primitives.
  60  *
  61  * FIXME this driver currently requires use of the first interrupt line
  62  * (and associated registers).
  63  */
  64
  65 #define DRIVER_NAME                     "twl"
  66
  67 /* Triton Core internal information (BEGIN) */
  68
  69 /* Base Address defns for twl4030_map[] */
  70
  71 /* subchip/slave 0 - USB ID */
  72 #define TWL4030_BASEADD_USB             0x0000
  73
  74 /* subchip/slave 1 - AUD ID */
  75 #define TWL4030_BASEADD_AUDIO_VOICE     0x0000
  76 #define TWL4030_BASEADD_GPIO            0x0098
  77 #define TWL4030_BASEADD_INTBR           0x0085
  78 #define TWL4030_BASEADD_PIH             0x0080
  79 #define TWL4030_BASEADD_TEST            0x004C
  80
  81 /* subchip/slave 2 - AUX ID */
  82 #define TWL4030_BASEADD_INTERRUPTS      0x00B9
  83 #define TWL4030_BASEADD_LED             0x00EE
  84 #define TWL4030_BASEADD_MADC            0x0000
  85 #define TWL4030_BASEADD_MAIN_CHARGE     0x0074
  86 #define TWL4030_BASEADD_PRECHARGE       0x00AA
  87 #define TWL4030_BASEADD_PWM             0x00F8
  88 #define TWL4030_BASEADD_KEYPAD          0x00D2
  89
  90 #define TWL5031_BASEADD_ACCESSORY       0x0074 /* Replaces Main Charge */
  91 #define TWL5031_BASEADD_INTERRUPTS      0x00B9 /* Different than TWL4030's
  92                                                   one */
  93
  94 /* subchip/slave 3 - POWER ID */
  95 #define TWL4030_BASEADD_BACKUP          0x0014
  96 #define TWL4030_BASEADD_INT             0x002E
  97 #define TWL4030_BASEADD_PM_MASTER       0x0036
  98 #define TWL4030_BASEADD_PM_RECEIVER     0x005B
  99 #define TWL4030_BASEADD_RTC             0x001C
 100 #define TWL4030_BASEADD_SECURED_REG     0x0000
 101
 102 /* Triton Core internal information (END) */
 103
 104
 105 /* subchip/slave 0 0x48 - POWER */
 106 #define TWL6030_BASEADD_RTC             0x0000
 107 #define TWL6030_BASEADD_SECURED_REG     0x0017
 108 #define TWL6030_BASEADD_PM_MASTER       0x001F
 109 #define TWL6030_BASEADD_PM_SLAVE_MISC   0x0030 /* PM_RECEIVER */
 110 #define TWL6030_BASEADD_PM_MISC         0x00E2
 111 #define TWL6030_BASEADD_PM_PUPD         0x00F0
 112
 113 /* subchip/slave 1 0x49 - FEATURE */
 114 #define TWL6030_BASEADD_USB             0x0000
 115 #define TWL6030_BASEADD_GPADC_CTRL      0x002E
 116 #define TWL6030_BASEADD_AUX             0x0090
 117 #define TWL6030_BASEADD_PWM             0x00BA
 118 #define TWL6030_BASEADD_GASGAUGE        0x00C0
 119 #define TWL6030_BASEADD_PIH             0x00D0
 120 #define TWL6030_BASEADD_CHARGER         0x00E0
 121 #define TWL6032_BASEADD_CHARGER         0x00DA
 122 #define TWL6030_BASEADD_LED             0x00F4
 123
 124 /* subchip/slave 2 0x4A - DFT */
 125 #define TWL6030_BASEADD_DIEID           0x00C0
 126
 127 /* subchip/slave 3 0x4B - AUDIO */
 128 #define TWL6030_BASEADD_AUDIO           0x0000
 129 #define TWL6030_BASEADD_RSV             0x0000
 130 #define TWL6030_BASEADD_ZERO            0x0000
 131
 132 /* Few power values */
 133 #define R_CFG_BOOT                      0x05
 134
 135 /* some fields in R_CFG_BOOT */
 136 #define HFCLK_FREQ_19p2_MHZ             (1 << 0)
 137 #define HFCLK_FREQ_26_MHZ               (2 << 0)
 138 #define HFCLK_FREQ_38p4_MHZ             (3 << 0)
 139 #define HIGH_PERF_SQ                    (1 << 3)
 140 #define CK32K_LOWPWR_EN                 (1 << 7)
 141
 142 /*----------------------------------------------------------------------*/
 143
 144 /* Structure for each TWL4030/TWL6030 Slave */
 145 struct twl_client {
 146         struct i2c_client *client;
 147         struct regmap *regmap;
 148 };
 149
 150 /* mapping the module id to slave id and base address */
 151 struct twl_mapping {
 152         unsigned char sid;      /* Slave ID */
 153         unsigned char base;     /* base address */
 154 };
 155
 156 struct twl_private {
 157         bool ready; /* The core driver is ready to be used */
 158         u32 twl_idcode; /* TWL IDCODE Register value */
 159         unsigned int twl_id;
 160
 161         struct twl_mapping *twl_map;
 162         struct twl_client *twl_modules;
 163 };
 164
 165 static struct twl_private *twl_priv;
 166
 167 static struct twl_mapping twl4030_map[] = {
 168         /*
 169          * NOTE:  don't change this table without updating the
 170          * <linux/i2c/twl.h> defines for TWL4030_MODULE_*
 171          * so they continue to match the order in this table.
 172          */
 173
 174         /* Common IPs */
 175         { 0, TWL4030_BASEADD_USB },
 176         { 1, TWL4030_BASEADD_PIH },
 177         { 2, TWL4030_BASEADD_MAIN_CHARGE },
 178         { 3, TWL4030_BASEADD_PM_MASTER },
 179         { 3, TWL4030_BASEADD_PM_RECEIVER },
 180
 181         { 3, TWL4030_BASEADD_RTC },
 182         { 2, TWL4030_BASEADD_PWM },
 183         { 2, TWL4030_BASEADD_LED },
 184         { 3, TWL4030_BASEADD_SECURED_REG },
 185
 186         /* TWL4030 specific IPs */
 187         { 1, TWL4030_BASEADD_AUDIO_VOICE },
 188         { 1, TWL4030_BASEADD_GPIO },
 189         { 1, TWL4030_BASEADD_INTBR },
 190         { 1, TWL4030_BASEADD_TEST },
 191         { 2, TWL4030_BASEADD_KEYPAD },
 192
 193         { 2, TWL4030_BASEADD_MADC },
 194         { 2, TWL4030_BASEADD_INTERRUPTS },
 195         { 2, TWL4030_BASEADD_PRECHARGE },
 196         { 3, TWL4030_BASEADD_BACKUP },
 197         { 3, TWL4030_BASEADD_INT },
 198
 199         { 2, TWL5031_BASEADD_ACCESSORY },
 200         { 2, TWL5031_BASEADD_INTERRUPTS },
 201 };
 202
 203 static struct regmap_config twl4030_regmap_config[4] = {
 204         {
 205                 /* Address 0x48 */
 206                 .reg_bits = 8,
 207                 .val_bits = 8,
 208                 .max_register = 0xff,
 209         },
 210         {
 211                 /* Address 0x49 */
 212                 .reg_bits = 8,
 213                 .val_bits = 8,
 214                 .max_register = 0xff,
 215         },
 216         {
 217                 /* Address 0x4a */
 218                 .reg_bits = 8,
 219                 .val_bits = 8,
 220                 .max_register = 0xff,
 221         },
 222         {
 223                 /* Address 0x4b */
 224                 .reg_bits = 8,
 225                 .val_bits = 8,
 226                 .max_register = 0xff,
 227         },
 228 };
 229
 230 static struct twl_mapping twl6030_map[] = {
 231         /*
 232          * NOTE:  don't change this table without updating the
 233          * <linux/i2c/twl.h> defines for TWL4030_MODULE_*
 234          * so they continue to match the order in this table.
 235          */
 236
 237         /* Common IPs */
 238         { 1, TWL6030_BASEADD_USB },
 239         { 1, TWL6030_BASEADD_PIH },
 240         { 1, TWL6030_BASEADD_CHARGER },
 241         { 0, TWL6030_BASEADD_PM_MASTER },
 242         { 0, TWL6030_BASEADD_PM_SLAVE_MISC },
 243
 244         { 0, TWL6030_BASEADD_RTC },
 245         { 1, TWL6030_BASEADD_PWM },
 246         { 1, TWL6030_BASEADD_LED },
 247         { 0, TWL6030_BASEADD_SECURED_REG },
 248
 249         /* TWL6030 specific IPs */
 250         { 0, TWL6030_BASEADD_ZERO },
 251         { 1, TWL6030_BASEADD_ZERO },
 252         { 2, TWL6030_BASEADD_ZERO },
 253         { 1, TWL6030_BASEADD_GPADC_CTRL },
 254         { 1, TWL6030_BASEADD_GASGAUGE },
 255 };
 256
 257 static struct regmap_config twl6030_regmap_config[3] = {
 258         {
 259                 /* Address 0x48 */
 260                 .reg_bits = 8,
 261                 .val_bits = 8,
 262                 .max_register = 0xff,
 263         },
 264         {
 265                 /* Address 0x49 */
 266                 .reg_bits = 8,
 267                 .val_bits = 8,
 268                 .max_register = 0xff,
 269         },
 270         {
 271                 /* Address 0x4a */
 272                 .reg_bits = 8,
 273                 .val_bits = 8,
 274                 .max_register = 0xff,
 275         },
 276 };
 277
 278 /*----------------------------------------------------------------------*/
 279
 280 static inline int twl_get_num_slaves(void)
 281 {
 282         if (twl_class_is_4030())
 283                 return 4; /* TWL4030 class have four slave address */
 284         else
 285                 return 3; /* TWL6030 class have three slave address */
 286 }
 287
 288 static inline int twl_get_last_module(void)
 289 {
 290         if (twl_class_is_4030())
 291                 return TWL4030_MODULE_LAST;
 292         else
 293                 return TWL6030_MODULE_LAST;
 294 }
 295
 296 /* Exported Functions */
 297
 298 unsigned int twl_rev(void)
 299 {
 300         return twl_priv ? twl_priv->twl_id : 0;
 301 }
 302 EXPORT_SYMBOL(twl_rev);
 303
 304 /**
 305  * twl_i2c_write - Writes a n bit register in TWL4030/TWL5030/TWL60X0
 306  * @mod_no: module number
 307  * @value: an array of num_bytes+1 containing data to write
 308  * @reg: register address (just offset will do)
 309  * @num_bytes: number of bytes to transfer
 310  *
 311  * Returns the result of operation - 0 is success
 312  */
 313 int twl_i2c_write(u8 mod_no, u8 *value, u8 reg, unsigned num_bytes)
 314 {
 315         int ret;
 316         int sid;
 317         struct twl_client *twl;
 318
 319         if (unlikely(!twl_priv || !twl_priv->ready)) {
 320                 pr_err("%s: not initialized\n", DRIVER_NAME);
 321                 return -EPERM;
 322         }
 323         if (unlikely(mod_no >= twl_get_last_module())) {
 324                 pr_err("%s: invalid module number %d\n", DRIVER_NAME, mod_no);
 325                 return -EPERM;
 326         }
 327
 328         sid = twl_priv->twl_map[mod_no].sid;
 329         twl = &twl_priv->twl_modules[sid];
 330
 331         ret = regmap_bulk_write(twl->regmap,
 332                                 twl_priv->twl_map[mod_no].base + reg, value,
 333                                 num_bytes);
 334
 335         if (ret)
 336                 pr_err("%s: Write failed (mod %d, reg 0x%02x count %d)\n",
 337                        DRIVER_NAME, mod_no, reg, num_bytes);
 338
 339         return ret;
 340 }
 341 EXPORT_SYMBOL(twl_i2c_write);
 342
 343 /**
 344  * twl_i2c_read - Reads a n bit register in TWL4030/TWL5030/TWL60X0
 345  * @mod_no: module number
 346  * @value: an array of num_bytes containing data to be read
 347  * @reg: register address (just offset will do)
 348  * @num_bytes: number of bytes to transfer
 349  *
 350  * Returns result of operation - num_bytes is success else failure.
 351  */
 352 int twl_i2c_read(u8 mod_no, u8 *value, u8 reg, unsigned num_bytes)
 353 {
 354         int ret;
 355         int sid;
 356         struct twl_client *twl;
 357
 358         if (unlikely(!twl_priv || !twl_priv->ready)) {
 359                 pr_err("%s: not initialized\n", DRIVER_NAME);
 360                 return -EPERM;
 361         }
 362         if (unlikely(mod_no >= twl_get_last_module())) {
 363                 pr_err("%s: invalid module number %d\n", DRIVER_NAME, mod_no);
 364                 return -EPERM;
 365         }
 366
 367         sid = twl_priv->twl_map[mod_no].sid;
 368         twl = &twl_priv->twl_modules[sid];
 369
 370         ret = regmap_bulk_read(twl->regmap,
 371                                twl_priv->twl_map[mod_no].base + reg, value,
 372                                num_bytes);
 373
 374         if (ret)
 375                 pr_err("%s: Read failed (mod %d, reg 0x%02x count %d)\n",
 376                        DRIVER_NAME, mod_no, reg, num_bytes);
 377
 378         return ret;
 379 }
 380 EXPORT_SYMBOL(twl_i2c_read);
 381
 382 /*----------------------------------------------------------------------*/
 383
 384 /**
 385  * twl_read_idcode_register - API to read the IDCODE register.
 386  *
 387  * Unlocks the IDCODE register and read the 32 bit value.
 388  */
 389 static int twl_read_idcode_register(void)
 390 {
 391         int err;
 392
 393         err = twl_i2c_write_u8(TWL4030_MODULE_INTBR, TWL_EEPROM_R_UNLOCK,
 394                                                 REG_UNLOCK_TEST_REG);
 395         if (err) {
 396                 pr_err("TWL4030 Unable to unlock IDCODE registers -%d\n", err);
 397                 goto fail;
 398         }
 399
 400         err = twl_i2c_read(TWL4030_MODULE_INTBR, (u8 *)(&twl_priv->twl_idcode),
 401                                                 REG_IDCODE_7_0, 4);
 402         if (err) {
 403                 pr_err("TWL4030: unable to read IDCODE -%d\n", err);
 404                 goto fail;
 405         }
 406
 407         err = twl_i2c_write_u8(TWL4030_MODULE_INTBR, 0x0, REG_UNLOCK_TEST_REG);
 408         if (err)
 409                 pr_err("TWL4030 Unable to relock IDCODE registers -%d\n", err);
 410 fail:
 411         return err;
 412 }
 413
 414 /**
 415  * twl_get_type - API to get TWL Si type.
 416  *
 417  * Api to get the TWL Si type from IDCODE value.
 418  */
 419 int twl_get_type(void)
 420 {
 421         return TWL_SIL_TYPE(twl_priv->twl_idcode);
 422 }
 423 EXPORT_SYMBOL_GPL(twl_get_type);
 424
 425 /**
 426  * twl_get_version - API to get TWL Si version.
 427  *
 428  * Api to get the TWL Si version from IDCODE value.
 429  */
 430 int twl_get_version(void)
 431 {
 432         return TWL_SIL_REV(twl_priv->twl_idcode);
 433 }
 434 EXPORT_SYMBOL_GPL(twl_get_version);
 435
 436 /**
 437  * twl_get_hfclk_rate - API to get TWL external HFCLK clock rate.
 438  *
 439  * Api to get the TWL HFCLK rate based on BOOT_CFG register.
 440  */
 441 int twl_get_hfclk_rate(void)
 442 {
 443         u8 ctrl;
 444         int rate;
 445
 446         twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &ctrl, R_CFG_BOOT);
 447
 448         switch (ctrl & 0x3) {
 449         case HFCLK_FREQ_19p2_MHZ:
 450                 rate = 19200000;
 451                 break;
 452         case HFCLK_FREQ_26_MHZ:
 453                 rate = 26000000;
 454                 break;
 455         case HFCLK_FREQ_38p4_MHZ:
 456                 rate = 38400000;
 457                 break;
 458         default:
 459                 pr_err("TWL4030: HFCLK is not configured\n");
 460                 rate = -EINVAL;
 461                 break;
 462         }
 463
 464         return rate;
 465 }
 466 EXPORT_SYMBOL_GPL(twl_get_hfclk_rate);
 467
 468 static struct device *
 469 add_numbered_child(unsigned mod_no, const char *name, int num,
 470                 void *pdata, unsigned pdata_len,
 471                 bool can_wakeup, int irq0, int irq1)
 472 {
 473         struct platform_device  *pdev;
 474         struct twl_client       *twl;
 475         int                     status, sid;
 476
 477         if (unlikely(mod_no >= twl_get_last_module())) {
 478                 pr_err("%s: invalid module number %d\n", DRIVER_NAME, mod_no);
 479                 return ERR_PTR(-EPERM);
 480         }
 481         sid = twl_priv->twl_map[mod_no].sid;
 482         twl = &twl_priv->twl_modules[sid];
 483
 484         pdev = platform_device_alloc(name, num);
 485         if (!pdev) {
 486                 dev_dbg(&twl->client->dev, "can't alloc dev\n");
 487                 status = -ENOMEM;
 488                 goto err;
 489         }
 490
 491         pdev->dev.parent = &twl->client->dev;
 492
 493         if (pdata) {
 494                 status = platform_device_add_data(pdev, pdata, pdata_len);
 495                 if (status < 0) {
 496                         dev_dbg(&pdev->dev, "can't add platform_data\n");
 497                         goto err;
 498                 }
 499         }
 500
 501         if (irq0) {
 502                 struct resource r[2] = {
 503                         { .start = irq0, .flags = IORESOURCE_IRQ, },
 504                         { .start = irq1, .flags = IORESOURCE_IRQ, },
 505                 };
 506
 507                 status = platform_device_add_resources(pdev, r, irq1 ? 2 : 1);
 508                 if (status < 0) {
 509                         dev_dbg(&pdev->dev, "can't add irqs\n");
 510                         goto err;
 511                 }
 512         }
 513
 514         status = platform_device_add(pdev);
 515         if (status == 0)
 516                 device_init_wakeup(&pdev->dev, can_wakeup);
 517
 518 err:
 519         if (status < 0) {
 520                 platform_device_put(pdev);
 521                 dev_err(&twl->client->dev, "can't add %s dev\n", name);
 522                 return ERR_PTR(status);
 523         }
 524         return &pdev->dev;
 525 }
 526
 527 static inline struct device *add_child(unsigned mod_no, const char *name,
 528                 void *pdata, unsigned pdata_len,
 529                 bool can_wakeup, int irq0, int irq1)
 530 {
 531         return add_numbered_child(mod_no, name, -1, pdata, pdata_len,
 532                 can_wakeup, irq0, irq1);
 533 }
 534
 535 static struct device *
 536 add_regulator_linked(int num, struct regulator_init_data *pdata,
 537                 struct regulator_consumer_supply *consumers,
 538                 unsigned num_consumers, unsigned long features)
 539 {
 540         struct twl_regulator_driver_data drv_data;
 541
 542         /* regulator framework demands init_data ... */
 543         if (!pdata)
 544                 return NULL;
 545
 546         if (consumers) {
 547                 pdata->consumer_supplies = consumers;
 548                 pdata->num_consumer_supplies = num_consumers;
 549         }
 550
 551         if (pdata->driver_data) {
 552                 /* If we have existing drv_data, just add the flags */
 553                 struct twl_regulator_driver_data *tmp;
 554                 tmp = pdata->driver_data;
 555                 tmp->features |= features;
 556         } else {
 557                 /* add new driver data struct, used only during init */
 558                 drv_data.features = features;
 559                 drv_data.set_voltage = NULL;
 560                 drv_data.get_voltage = NULL;
 561                 drv_data.data = NULL;
 562                 pdata->driver_data = &drv_data;
 563         }
 564
 565         /* NOTE:  we currently ignore regulator IRQs, e.g. for short circuits */
 566         return add_numbered_child(TWL_MODULE_PM_MASTER, "twl_reg", num,
 567                 pdata, sizeof(*pdata), false, 0, 0);
 568 }
 569
 570 static struct device *
 571 add_regulator(int num, struct regulator_init_data *pdata,
 572                 unsigned long features)
 573 {
 574         return add_regulator_linked(num, pdata, NULL, 0, features);
 575 }
 576
 577 /*
 578  * NOTE:  We know the first 8 IRQs after pdata->base_irq are
 579  * for the PIH, and the next are for the PWR_INT SIH, since
 580  * that's how twl_init_irq() sets things up.
 581  */
 582
 583 static int
 584 add_children(struct twl4030_platform_data *pdata, unsigned irq_base,
 585                 unsigned long features)
 586 {
 587         struct device   *child;
 588
 589         if (IS_ENABLED(CONFIG_GPIO_TWL4030) && pdata->gpio) {
 590                 child = add_child(TWL4030_MODULE_GPIO, "twl4030_gpio",
 591                                 pdata->gpio, sizeof(*pdata->gpio),
 592                                 false, irq_base + GPIO_INTR_OFFSET, 0);
 593                 if (IS_ERR(child))
 594                         return PTR_ERR(child);
 595         }
 596
 597         if (IS_ENABLED(CONFIG_KEYBOARD_TWL4030) && pdata->keypad) {
 598                 child = add_child(TWL4030_MODULE_KEYPAD, "twl4030_keypad",
 599                                 pdata->keypad, sizeof(*pdata->keypad),
 600                                 true, irq_base + KEYPAD_INTR_OFFSET, 0);
 601                 if (IS_ERR(child))
 602                         return PTR_ERR(child);
 603         }
 604
 605         if (IS_ENABLED(CONFIG_TWL4030_MADC) && pdata->madc &&
 606             twl_class_is_4030()) {
 607                 child = add_child(TWL4030_MODULE_MADC, "twl4030_madc",
 608                                 pdata->madc, sizeof(*pdata->madc),
 609                                 true, irq_base + MADC_INTR_OFFSET, 0);
 610                 if (IS_ERR(child))
 611                         return PTR_ERR(child);
 612         }
 613
 614         if (IS_ENABLED(CONFIG_RTC_DRV_TWL4030)) {
 615                 /*
 616                  * REVISIT platform_data here currently might expose the
 617                  * "msecure" line ... but for now we just expect board
 618                  * setup to tell the chip "it's always ok to SET_TIME".
 619                  * Eventually, Linux might become more aware of such
 620                  * HW security concerns, and "least privilege".
 621                  */
 622                 child = add_child(TWL_MODULE_RTC, "twl_rtc", NULL, 0,
 623                                 true, irq_base + RTC_INTR_OFFSET, 0);
 624                 if (IS_ERR(child))
 625                         return PTR_ERR(child);
 626         }
 627
 628         if (IS_ENABLED(CONFIG_PWM_TWL)) {
 629                 child = add_child(TWL_MODULE_PWM, "twl-pwm", NULL, 0,
 630                                   false, 0, 0);
 631                 if (IS_ERR(child))
 632                         return PTR_ERR(child);
 633         }
 634
 635         if (IS_ENABLED(CONFIG_PWM_TWL_LED)) {
 636                 child = add_child(TWL_MODULE_LED, "twl-pwmled", NULL, 0,
 637                                   false, 0, 0);
 638                 if (IS_ERR(child))
 639                         return PTR_ERR(child);
 640         }
 641
 642         if (IS_ENABLED(CONFIG_TWL4030_USB) && pdata->usb &&
 643             twl_class_is_4030()) {
 644
 645                 static struct regulator_consumer_supply usb1v5 = {
 646                         .supply =       "usb1v5",
 647                 };
 648                 static struct regulator_consumer_supply usb1v8 = {
 649                         .supply =       "usb1v8",
 650                 };
 651                 static struct regulator_consumer_supply usb3v1[] = {
 652                         { .supply =     "usb3v1" },
 653                         { .supply =     "bci3v1" },
 654                 };
 655
 656         /* First add the regulators so that they can be used by transceiver */
 657                 if (IS_ENABLED(CONFIG_REGULATOR_TWL4030)) {
 658                         /* this is a template that gets copied */
 659                         struct regulator_init_data usb_fixed = {
 660                                 .constraints.valid_modes_mask =
 661                                         REGULATOR_MODE_NORMAL
 662                                         | REGULATOR_MODE_STANDBY,
 663                                 .constraints.valid_ops_mask =
 664                                         REGULATOR_CHANGE_MODE
 665                                         | REGULATOR_CHANGE_STATUS,
 666                         };
 667
 668                         child = add_regulator_linked(TWL4030_REG_VUSB1V5,
 669                                                       &usb_fixed, &usb1v5, 1,
 670                                                       features);
 671                         if (IS_ERR(child))
 672                                 return PTR_ERR(child);
 673
 674                         child = add_regulator_linked(TWL4030_REG_VUSB1V8,
 675                                                       &usb_fixed, &usb1v8, 1,
 676                                                       features);
 677                         if (IS_ERR(child))
 678                                 return PTR_ERR(child);
 679
 680                         child = add_regulator_linked(TWL4030_REG_VUSB3V1,
 681                                                       &usb_fixed, usb3v1, 2,
 682                                                       features);
 683                         if (IS_ERR(child))
 684                                 return PTR_ERR(child);
 685
 686                 }
 687
 688                 child = add_child(TWL_MODULE_USB, "twl4030_usb",
 689                                 pdata->usb, sizeof(*pdata->usb), true,
 690                                 /* irq0 = USB_PRES, irq1 = USB */
 691                                 irq_base + USB_PRES_INTR_OFFSET,
 692                                 irq_base + USB_INTR_OFFSET);
 693
 694                 if (IS_ERR(child))
 695                         return PTR_ERR(child);
 696
 697                 /* we need to connect regulators to this transceiver */
 698                 if (IS_ENABLED(CONFIG_REGULATOR_TWL4030) && child) {
 699                         usb1v5.dev_name = dev_name(child);
 700                         usb1v8.dev_name = dev_name(child);
 701                         usb3v1[0].dev_name = dev_name(child);
 702                 }
 703         }
 704
 705         if (IS_ENABLED(CONFIG_TWL4030_WATCHDOG) && twl_class_is_4030()) {
 706                 child = add_child(TWL_MODULE_PM_RECEIVER, "twl4030_wdt", NULL,
 707                                   0, false, 0, 0);
 708                 if (IS_ERR(child))
 709                         return PTR_ERR(child);
 710         }
 711
 712         if (IS_ENABLED(CONFIG_INPUT_TWL4030_PWRBUTTON) && twl_class_is_4030()) {
 713                 child = add_child(TWL_MODULE_PM_MASTER, "twl4030_pwrbutton",
 714                                   NULL, 0, true, irq_base + 8 + 0, 0);
 715                 if (IS_ERR(child))
 716                         return PTR_ERR(child);
 717         }
 718
 719         if (IS_ENABLED(CONFIG_MFD_TWL4030_AUDIO) && pdata->audio &&
 720             twl_class_is_4030()) {
 721                 child = add_child(TWL4030_MODULE_AUDIO_VOICE, "twl4030-audio",
 722                                 pdata->audio, sizeof(*pdata->audio),
 723                                 false, 0, 0);
 724                 if (IS_ERR(child))
 725                         return PTR_ERR(child);
 726         }
 727
 728         /* twl4030 regulators */
 729         if (IS_ENABLED(CONFIG_REGULATOR_TWL4030) && twl_class_is_4030()) {
 730                 child = add_regulator(TWL4030_REG_VPLL1, pdata->vpll1,
 731                                         features);
 732                 if (IS_ERR(child))
 733                         return PTR_ERR(child);
 734
 735                 child = add_regulator(TWL4030_REG_VIO, pdata->vio,
 736                                         features);
 737                 if (IS_ERR(child))
 738                         return PTR_ERR(child);
 739
 740                 child = add_regulator(TWL4030_REG_VDD1, pdata->vdd1,
 741                                         features);
 742                 if (IS_ERR(child))
 743                         return PTR_ERR(child);
 744
 745                 child = add_regulator(TWL4030_REG_VDD2, pdata->vdd2,
 746                                         features);
 747                 if (IS_ERR(child))
 748                         return PTR_ERR(child);
 749
 750                 child = add_regulator(TWL4030_REG_VMMC1, pdata->vmmc1,
 751                                         features);
 752                 if (IS_ERR(child))
 753                         return PTR_ERR(child);
 754
 755                 child = add_regulator(TWL4030_REG_VDAC, pdata->vdac,
 756                                         features);
 757                 if (IS_ERR(child))
 758                         return PTR_ERR(child);
 759
 760                 child = add_regulator((features & TWL4030_VAUX2)
 761                                         ? TWL4030_REG_VAUX2_4030
 762                                         : TWL4030_REG_VAUX2,
 763                                 pdata->vaux2, features);
 764                 if (IS_ERR(child))
 765                         return PTR_ERR(child);
 766
 767                 child = add_regulator(TWL4030_REG_VINTANA1, pdata->vintana1,
 768                                         features);
 769                 if (IS_ERR(child))
 770                         return PTR_ERR(child);
 771
 772                 child = add_regulator(TWL4030_REG_VINTANA2, pdata->vintana2,
 773                                         features);
 774                 if (IS_ERR(child))
 775                         return PTR_ERR(child);
 776
 777                 child = add_regulator(TWL4030_REG_VINTDIG, pdata->vintdig,
 778                                         features);
 779                 if (IS_ERR(child))
 780                         return PTR_ERR(child);
 781         }
 782
 783         /* maybe add LDOs that are omitted on cost-reduced parts */
 784         if (IS_ENABLED(CONFIG_REGULATOR_TWL4030) && !(features & TPS_SUBSET)
 785           && twl_class_is_4030()) {
 786                 child = add_regulator(TWL4030_REG_VPLL2, pdata->vpll2,
 787                                         features);
 788                 if (IS_ERR(child))
 789                         return PTR_ERR(child);
 790
 791                 child = add_regulator(TWL4030_REG_VMMC2, pdata->vmmc2,
 792                                         features);
 793                 if (IS_ERR(child))
 794                         return PTR_ERR(child);
 795
 796                 child = add_regulator(TWL4030_REG_VSIM, pdata->vsim,
 797                                         features);
 798                 if (IS_ERR(child))
 799                         return PTR_ERR(child);
 800
 801                 child = add_regulator(TWL4030_REG_VAUX1, pdata->vaux1,
 802                                         features);
 803                 if (IS_ERR(child))
 804                         return PTR_ERR(child);
 805
 806                 child = add_regulator(TWL4030_REG_VAUX3, pdata->vaux3,
 807                                         features);
 808                 if (IS_ERR(child))
 809                         return PTR_ERR(child);
 810
 811                 child = add_regulator(TWL4030_REG_VAUX4, pdata->vaux4,
 812                                         features);
 813                 if (IS_ERR(child))
 814                         return PTR_ERR(child);
 815         }
 816
 817         if (IS_ENABLED(CONFIG_CHARGER_TWL4030) && pdata->bci &&
 818                         !(features & (TPS_SUBSET | TWL5031))) {
 819                 child = add_child(TWL_MODULE_MAIN_CHARGE, "twl4030_bci",
 820                                 pdata->bci, sizeof(*pdata->bci), false,
 821                                 /* irq0 = CHG_PRES, irq1 = BCI */
 822                                 irq_base + BCI_PRES_INTR_OFFSET,
 823                                 irq_base + BCI_INTR_OFFSET);
 824                 if (IS_ERR(child))
 825                         return PTR_ERR(child);
 826         }
 827
 828         if (IS_ENABLED(CONFIG_TWL4030_POWER) && pdata->power) {
 829                 child = add_child(TWL_MODULE_PM_MASTER, "twl4030_power",
 830                                   pdata->power, sizeof(*pdata->power), false,
 831                                   0, 0);
 832                 if (IS_ERR(child))
 833                         return PTR_ERR(child);
 834         }
 835
 836         return 0;
 837 }
 838
 839 /*----------------------------------------------------------------------*/
 840
 841 /*
 842  * These three functions initialize the on-chip clock framework,
 843  * letting it generate the right frequencies for USB, MADC, and
 844  * other purposes.
 845  */
 846 static inline int __init protect_pm_master(void)
 847 {
 848         int e = 0;
 849
 850         e = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, 0,
 851                              TWL4030_PM_MASTER_PROTECT_KEY);
 852         return e;
 853 }
 854
 855 static inline int __init unprotect_pm_master(void)
 856 {
 857         int e = 0;
 858
 859         e |= twl_i2c_write_u8(TWL_MODULE_PM_MASTER, TWL4030_PM_MASTER_KEY_CFG1,
 860                               TWL4030_PM_MASTER_PROTECT_KEY);
 861         e |= twl_i2c_write_u8(TWL_MODULE_PM_MASTER, TWL4030_PM_MASTER_KEY_CFG2,
 862                               TWL4030_PM_MASTER_PROTECT_KEY);
 863
 864         return e;
 865 }
 866
 867 static void clocks_init(struct device *dev,
 868                         struct twl4030_clock_init_data *clock)
 869 {
 870         int e = 0;
 871         struct clk *osc;
 872         u32 rate;
 873         u8 ctrl = HFCLK_FREQ_26_MHZ;
 874
 875         osc = clk_get(dev, "fck");
 876         if (IS_ERR(osc)) {
 877                 printk(KERN_WARNING "Skipping twl internal clock init and "
 878                                 "using bootloader value (unknown osc rate)\n");
 879                 return;
 880         }
 881
 882         rate = clk_get_rate(osc);
 883         clk_put(osc);
 884
 885         switch (rate) {
 886         case 19200000:
 887                 ctrl = HFCLK_FREQ_19p2_MHZ;
 888                 break;
 889         case 26000000:
 890                 ctrl = HFCLK_FREQ_26_MHZ;
 891                 break;
 892         case 38400000:
 893                 ctrl = HFCLK_FREQ_38p4_MHZ;
 894                 break;
 895         }
 896
 897         ctrl |= HIGH_PERF_SQ;
 898         if (clock && clock->ck32k_lowpwr_enable)
 899                 ctrl |= CK32K_LOWPWR_EN;
 900
 901         e |= unprotect_pm_master();
 902         /* effect->MADC+USB ck en */
 903         e |= twl_i2c_write_u8(TWL_MODULE_PM_MASTER, ctrl, R_CFG_BOOT);
 904         e |= protect_pm_master();
 905
 906         if (e < 0)
 907                 pr_err("%s: clock init err [%d]\n", DRIVER_NAME, e);
 908 }
 909
 910 /*----------------------------------------------------------------------*/
 911
 912
 913 static int twl_remove(struct i2c_client *client)
 914 {
 915         unsigned i, num_slaves;
 916         int status;
 917
 918         if (twl_class_is_4030())
 919                 status = twl4030_exit_irq();
 920         else
 921                 status = twl6030_exit_irq();
 922
 923         if (status < 0)
 924                 return status;
 925
 926         num_slaves = twl_get_num_slaves();
 927         for (i = 0; i < num_slaves; i++) {
 928                 struct twl_client       *twl = &twl_priv->twl_modules[i];
 929
 930                 if (twl->client && twl->client != client)
 931                         i2c_unregister_device(twl->client);
 932                 twl->client = NULL;
 933         }
 934         twl_priv->ready = false;
 935         return 0;
 936 }
 937
 938 /* NOTE: This driver only handles a single twl4030/tps659x0 chip */
 939 static int
 940 twl_probe(struct i2c_client *client, const struct i2c_device_id *id)
 941 {
 942         struct twl4030_platform_data    *pdata = dev_get_platdata(&client->dev);
 943         struct device_node              *node = client->dev.of_node;
 944         struct platform_device          *pdev;
 945         struct regmap_config            *twl_regmap_config;
 946         int                             irq_base = 0;
 947         int                             status;
 948         unsigned                        i, num_slaves;
 949
 950         if (!node && !pdata) {
 951                 dev_err(&client->dev, "no platform data\n");
 952                 return -EINVAL;
 953         }
 954
 955         if (twl_priv) {
 956                 dev_dbg(&client->dev, "only one instance of %s allowed\n",
 957                         DRIVER_NAME);
 958                 return -EBUSY;
 959         }
 960
 961         pdev = platform_device_alloc(DRIVER_NAME, -1);
 962         if (!pdev) {
 963                 dev_err(&client->dev, "can't alloc pdev\n");
 964                 return -ENOMEM;
 965         }
 966
 967         status = platform_device_add(pdev);
 968         if (status) {
 969                 platform_device_put(pdev);
 970                 return status;
 971         }
 972
 973         if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C) == 0) {
 974                 dev_dbg(&client->dev, "can't talk I2C?\n");
 975                 status = -EIO;
 976                 goto free;
 977         }
 978
 979         twl_priv = devm_kzalloc(&client->dev, sizeof(struct twl_private),
 980                                 GFP_KERNEL);
 981         if (!twl_priv) {
 982                 status = -ENOMEM;
 983                 goto free;
 984         }
 985
 986         if ((id->driver_data) & TWL6030_CLASS) {
 987                 twl_priv->twl_id = TWL6030_CLASS_ID;
 988                 twl_priv->twl_map = &twl6030_map[0];
 989                 /* The charger base address is different in twl6032 */
 990                 if ((id->driver_data) & TWL6032_SUBCLASS)
 991                         twl_priv->twl_map[TWL_MODULE_MAIN_CHARGE].base =
 992                                                         TWL6032_BASEADD_CHARGER;
 993                 twl_regmap_config = twl6030_regmap_config;
 994         } else {
 995                 twl_priv->twl_id = TWL4030_CLASS_ID;
 996                 twl_priv->twl_map = &twl4030_map[0];
 997                 twl_regmap_config = twl4030_regmap_config;
 998         }
 999
1000         num_slaves = twl_get_num_slaves();
1001         twl_priv->twl_modules = devm_kzalloc(&client->dev,
1002                                          sizeof(struct twl_client) * num_slaves,
1003                                          GFP_KERNEL);
1004         if (!twl_priv->twl_modules) {
1005                 status = -ENOMEM;
1006                 goto free;
1007         }
1008
1009         for (i = 0; i < num_slaves; i++) {
1010                 struct twl_client *twl = &twl_priv->twl_modules[i];
1011
1012                 if (i == 0) {
1013                         twl->client = client;
1014                 } else {
1015                         twl->client = i2c_new_dummy(client->adapter,
1016                                                     client->addr + i);
1017                         if (!twl->client) {
1018                                 dev_err(&client->dev,
1019                                         "can't attach client %d\n", i);
1020                                 status = -ENOMEM;
1021                                 goto fail;
1022                         }
1023                 }
1024
1025                 twl->regmap = devm_regmap_init_i2c(twl->client,
1026                                                    &twl_regmap_config[i]);
1027                 if (IS_ERR(twl->regmap)) {
1028                         status = PTR_ERR(twl->regmap);
1029                         dev_err(&client->dev,
1030                                 "Failed to allocate regmap %d, err: %d\n", i,
1031                                 status);
1032                         goto fail;
1033                 }
1034         }
1035
1036         twl_priv->ready = true;
1037
1038         /* setup clock framework */
1039         clocks_init(&pdev->dev, pdata ? pdata->clock : NULL);
1040
1041         /* read TWL IDCODE Register */
1042         if (twl_class_is_4030()) {
1043                 status = twl_read_idcode_register();
1044                 WARN(status < 0, "Error: reading twl_idcode register value\n");
1045         }
1046
1047         /* Maybe init the T2 Interrupt subsystem */
1048         if (client->irq) {
1049                 if (twl_class_is_4030()) {
1050                         twl4030_init_chip_irq(id->name);
1051                         irq_base = twl4030_init_irq(&client->dev, client->irq);
1052                 } else {
1053                         irq_base = twl6030_init_irq(&client->dev, client->irq);
1054                 }
1055
1056                 if (irq_base < 0) {
1057                         status = irq_base;
1058                         goto fail;
1059                 }
1060         }
1061
1062         /*
1063          * Disable TWL4030/TWL5030 I2C Pull-up on I2C1 and I2C4(SR) interface.
1064          * Program I2C_SCL_CTRL_PU(bit 0)=0, I2C_SDA_CTRL_PU (bit 2)=0,
1065          * SR_I2C_SCL_CTRL_PU(bit 4)=0 and SR_I2C_SDA_CTRL_PU(bit 6)=0.
1066          */
1067         if (twl_class_is_4030()) {
1068                 u8 temp;
1069
1070                 twl_i2c_read_u8(TWL4030_MODULE_INTBR, &temp, REG_GPPUPDCTR1);
1071                 temp &= ~(SR_I2C_SDA_CTRL_PU | SR_I2C_SCL_CTRL_PU | \
1072                         I2C_SDA_CTRL_PU | I2C_SCL_CTRL_PU);
1073                 twl_i2c_write_u8(TWL4030_MODULE_INTBR, temp, REG_GPPUPDCTR1);
1074         }
1075
1076         if (node)
1077                 status = of_platform_populate(node, NULL, NULL, &client->dev);
1078         else
1079                 status = add_children(pdata, irq_base, id->driver_data);
1080
1081 fail:
1082         if (status < 0)
1083                 twl_remove(client);
1084 free:
1085         if (status < 0)
1086                 platform_device_unregister(pdev);
1087
1088         return status;
1089 }
1090
1091 static const struct i2c_device_id twl_ids[] = {
1092         { "twl4030", TWL4030_VAUX2 },   /* "Triton 2" */
1093         { "twl5030", 0 },               /* T2 updated */
1094         { "twl5031", TWL5031 },         /* TWL5030 updated */
1095         { "tps65950", 0 },              /* catalog version of twl5030 */
1096         { "tps65930", TPS_SUBSET },     /* fewer LDOs and DACs; no charger */
1097         { "tps65920", TPS_SUBSET },     /* fewer LDOs; no codec or charger */
1098         { "tps65921", TPS_SUBSET },     /* fewer LDOs; no codec, no LED
1099                                            and vibrator. Charger in USB module*/
1100         { "twl6030", TWL6030_CLASS },   /* "Phoenix power chip" */
1101         { "twl6032", TWL6030_CLASS | TWL6032_SUBCLASS }, /* "Phoenix lite" */
1102         { /* end of list */ },
1103 };
1104 MODULE_DEVICE_TABLE(i2c, twl_ids);
1105
1106 /* One Client Driver , 4 Clients */
1107 static struct i2c_driver twl_driver = {
1108         .driver.name    = DRIVER_NAME,
1109         .id_table       = twl_ids,
1110         .probe          = twl_probe,
1111         .remove         = twl_remove,
1112 };
1113
1114 module_i2c_driver(twl_driver);
1115
1116 MODULE_AUTHOR("Texas Instruments, Inc.");
1117 MODULE_DESCRIPTION("I2C Core interface for TWL");
1118 MODULE_LICENSE("GPL");