drivers/mfd/stmpe.c

   1 /*
   2  * ST Microelectronics MFD: stmpe's driver
   3  *
   4  * Copyright (C) ST-Ericsson SA 2010
   5  *
   6  * License Terms: GNU General Public License, version 2
   7  * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
   8  */
   9
  10 #include <linux/gpio.h>
  11 #include <linux/export.h>
  12 #include <linux/kernel.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/irq.h>
  15 #include <linux/pm.h>
  16 #include <linux/slab.h>
  17 #include <linux/mfd/core.h>
  18 #include "stmpe.h"
  19
  20 static int __stmpe_enable(struct stmpe *stmpe, unsigned int blocks)
  21 {
  22         return stmpe->variant->enable(stmpe, blocks, true);
  23 }
  24
  25 static int __stmpe_disable(struct stmpe *stmpe, unsigned int blocks)
  26 {
  27         return stmpe->variant->enable(stmpe, blocks, false);
  28 }
  29
  30 static int __stmpe_reg_read(struct stmpe *stmpe, u8 reg)
  31 {
  32         int ret;
  33
  34         ret = stmpe->ci->read_byte(stmpe, reg);
  35         if (ret < 0)
  36                 dev_err(stmpe->dev, "failed to read reg %#x: %d\n", reg, ret);
  37
  38         dev_vdbg(stmpe->dev, "rd: reg %#x => data %#x\n", reg, ret);
  39
  40         return ret;
  41 }
  42
  43 static int __stmpe_reg_write(struct stmpe *stmpe, u8 reg, u8 val)
  44 {
  45         int ret;
  46
  47         dev_vdbg(stmpe->dev, "wr: reg %#x <= %#x\n", reg, val);
  48
  49         ret = stmpe->ci->write_byte(stmpe, reg, val);
  50         if (ret < 0)
  51                 dev_err(stmpe->dev, "failed to write reg %#x: %d\n", reg, ret);
  52
  53         return ret;
  54 }
  55
  56 static int __stmpe_set_bits(struct stmpe *stmpe, u8 reg, u8 mask, u8 val)
  57 {
  58         int ret;
  59
  60         ret = __stmpe_reg_read(stmpe, reg);
  61         if (ret < 0)
  62                 return ret;
  63
  64         ret &= ~mask;
  65         ret |= val;
  66
  67         return __stmpe_reg_write(stmpe, reg, ret);
  68 }
  69
  70 static int __stmpe_block_read(struct stmpe *stmpe, u8 reg, u8 length,
  71                               u8 *values)
  72 {
  73         int ret;
  74
  75         ret = stmpe->ci->read_block(stmpe, reg, length, values);
  76         if (ret < 0)
  77                 dev_err(stmpe->dev, "failed to read regs %#x: %d\n", reg, ret);
  78
  79         dev_vdbg(stmpe->dev, "rd: reg %#x (%d) => ret %#x\n", reg, length, ret);
  80         stmpe_dump_bytes("stmpe rd: ", values, length);
  81
  82         return ret;
  83 }
  84
  85 static int __stmpe_block_write(struct stmpe *stmpe, u8 reg, u8 length,
  86                         const u8 *values)
  87 {
  88         int ret;
  89
  90         dev_vdbg(stmpe->dev, "wr: regs %#x (%d)\n", reg, length);
  91         stmpe_dump_bytes("stmpe wr: ", values, length);
  92
  93         ret = stmpe->ci->write_block(stmpe, reg, length, values);
  94         if (ret < 0)
  95                 dev_err(stmpe->dev, "failed to write regs %#x: %d\n", reg, ret);
  96
  97         return ret;
  98 }
  99
 100 /**
 101  * stmpe_enable - enable blocks on an STMPE device
 102  * @stmpe:      Device to work on
 103  * @blocks:     Mask of blocks (enum stmpe_block values) to enable
 104  */
 105 int stmpe_enable(struct stmpe *stmpe, unsigned int blocks)
 106 {
 107         int ret;
 108
 109         mutex_lock(&stmpe->lock);
 110         ret = __stmpe_enable(stmpe, blocks);
 111         mutex_unlock(&stmpe->lock);
 112
 113         return ret;
 114 }
 115 EXPORT_SYMBOL_GPL(stmpe_enable);
 116
 117 /**
 118  * stmpe_disable - disable blocks on an STMPE device
 119  * @stmpe:      Device to work on
 120  * @blocks:     Mask of blocks (enum stmpe_block values) to enable
 121  */
 122 int stmpe_disable(struct stmpe *stmpe, unsigned int blocks)
 123 {
 124         int ret;
 125
 126         mutex_lock(&stmpe->lock);
 127         ret = __stmpe_disable(stmpe, blocks);
 128         mutex_unlock(&stmpe->lock);
 129
 130         return ret;
 131 }
 132 EXPORT_SYMBOL_GPL(stmpe_disable);
 133
 134 /**
 135  * stmpe_reg_read() - read a single STMPE register
 136  * @stmpe:      Device to read from
 137  * @reg:        Register to read
 138  */
 139 int stmpe_reg_read(struct stmpe *stmpe, u8 reg)
 140 {
 141         int ret;
 142
 143         mutex_lock(&stmpe->lock);
 144         ret = __stmpe_reg_read(stmpe, reg);
 145         mutex_unlock(&stmpe->lock);
 146
 147         return ret;
 148 }
 149 EXPORT_SYMBOL_GPL(stmpe_reg_read);
 150
 151 /**
 152  * stmpe_reg_write() - write a single STMPE register
 153  * @stmpe:      Device to write to
 154  * @reg:        Register to write
 155  * @val:        Value to write
 156  */
 157 int stmpe_reg_write(struct stmpe *stmpe, u8 reg, u8 val)
 158 {
 159         int ret;
 160
 161         mutex_lock(&stmpe->lock);
 162         ret = __stmpe_reg_write(stmpe, reg, val);
 163         mutex_unlock(&stmpe->lock);
 164
 165         return ret;
 166 }
 167 EXPORT_SYMBOL_GPL(stmpe_reg_write);
 168
 169 /**
 170  * stmpe_set_bits() - set the value of a bitfield in a STMPE register
 171  * @stmpe:      Device to write to
 172  * @reg:        Register to write
 173  * @mask:       Mask of bits to set
 174  * @val:        Value to set
 175  */
 176 int stmpe_set_bits(struct stmpe *stmpe, u8 reg, u8 mask, u8 val)
 177 {
 178         int ret;
 179
 180         mutex_lock(&stmpe->lock);
 181         ret = __stmpe_set_bits(stmpe, reg, mask, val);
 182         mutex_unlock(&stmpe->lock);
 183
 184         return ret;
 185 }
 186 EXPORT_SYMBOL_GPL(stmpe_set_bits);
 187
 188 /**
 189  * stmpe_block_read() - read multiple STMPE registers
 190  * @stmpe:      Device to read from
 191  * @reg:        First register
 192  * @length:     Number of registers
 193  * @values:     Buffer to write to
 194  */
 195 int stmpe_block_read(struct stmpe *stmpe, u8 reg, u8 length, u8 *values)
 196 {
 197         int ret;
 198
 199         mutex_lock(&stmpe->lock);
 200         ret = __stmpe_block_read(stmpe, reg, length, values);
 201         mutex_unlock(&stmpe->lock);
 202
 203         return ret;
 204 }
 205 EXPORT_SYMBOL_GPL(stmpe_block_read);
 206
 207 /**
 208  * stmpe_block_write() - write multiple STMPE registers
 209  * @stmpe:      Device to write to
 210  * @reg:        First register
 211  * @length:     Number of registers
 212  * @values:     Values to write
 213  */
 214 int stmpe_block_write(struct stmpe *stmpe, u8 reg, u8 length,
 215                       const u8 *values)
 216 {
 217         int ret;
 218
 219         mutex_lock(&stmpe->lock);
 220         ret = __stmpe_block_write(stmpe, reg, length, values);
 221         mutex_unlock(&stmpe->lock);
 222
 223         return ret;
 224 }
 225 EXPORT_SYMBOL_GPL(stmpe_block_write);
 226
 227 /**
 228  * stmpe_set_altfunc()- set the alternate function for STMPE pins
 229  * @stmpe:      Device to configure
 230  * @pins:       Bitmask of pins to affect
 231  * @block:      block to enable alternate functions for
 232  *
 233  * @pins is assumed to have a bit set for each of the bits whose alternate
 234  * function is to be changed, numbered according to the GPIOXY numbers.
 235  *
 236  * If the GPIO module is not enabled, this function automatically enables it in
 237  * order to perform the change.
 238  */
 239 int stmpe_set_altfunc(struct stmpe *stmpe, u32 pins, enum stmpe_block block)
 240 {
 241         struct stmpe_variant_info *variant = stmpe->variant;
 242         u8 regaddr = stmpe->regs[STMPE_IDX_GPAFR_U_MSB];
 243         int af_bits = variant->af_bits;
 244         int numregs = DIV_ROUND_UP(stmpe->num_gpios * af_bits, 8);
 245         int mask = (1 << af_bits) - 1;
 246         u8 regs[numregs];
 247         int af, afperreg, ret;
 248
 249         if (!variant->get_altfunc)
 250                 return 0;
 251
 252         afperreg = 8 / af_bits;
 253         mutex_lock(&stmpe->lock);
 254
 255         ret = __stmpe_enable(stmpe, STMPE_BLOCK_GPIO);
 256         if (ret < 0)
 257                 goto out;
 258
 259         ret = __stmpe_block_read(stmpe, regaddr, numregs, regs);
 260         if (ret < 0)
 261                 goto out;
 262
 263         af = variant->get_altfunc(stmpe, block);
 264
 265         while (pins) {
 266                 int pin = __ffs(pins);
 267                 int regoffset = numregs - (pin / afperreg) - 1;
 268                 int pos = (pin % afperreg) * (8 / afperreg);
 269
 270                 regs[regoffset] &= ~(mask << pos);
 271                 regs[regoffset] |= af << pos;
 272
 273                 pins &= ~(1 << pin);
 274         }
 275
 276         ret = __stmpe_block_write(stmpe, regaddr, numregs, regs);
 277
 278 out:
 279         mutex_unlock(&stmpe->lock);
 280         return ret;
 281 }
 282 EXPORT_SYMBOL_GPL(stmpe_set_altfunc);
 283
 284 /*
 285  * GPIO (all variants)
 286  */
 287
 288 static struct resource stmpe_gpio_resources[] = {
 289         /* Start and end filled dynamically */
 290         {
 291                 .flags  = IORESOURCE_IRQ,
 292         },
 293 };
 294
 295 static struct mfd_cell stmpe_gpio_cell = {
 296         .name           = "stmpe-gpio",
 297         .resources      = stmpe_gpio_resources,
 298         .num_resources  = ARRAY_SIZE(stmpe_gpio_resources),
 299 };
 300
 301 static struct mfd_cell stmpe_gpio_cell_noirq = {
 302         .name           = "stmpe-gpio",
 303         /* gpio cell resources consist of an irq only so no resources here */
 304 };
 305
 306 /*
 307  * Keypad (1601, 2401, 2403)
 308  */
 309
 310 static struct resource stmpe_keypad_resources[] = {
 311         {
 312                 .name   = "KEYPAD",
 313                 .start  = 0,
 314                 .end    = 0,
 315                 .flags  = IORESOURCE_IRQ,
 316         },
 317         {
 318                 .name   = "KEYPAD_OVER",
 319                 .start  = 1,
 320                 .end    = 1,
 321                 .flags  = IORESOURCE_IRQ,
 322         },
 323 };
 324
 325 static struct mfd_cell stmpe_keypad_cell = {
 326         .name           = "stmpe-keypad",
 327         .resources      = stmpe_keypad_resources,
 328         .num_resources  = ARRAY_SIZE(stmpe_keypad_resources),
 329 };
 330
 331 /*
 332  * STMPE801
 333  */
 334 static const u8 stmpe801_regs[] = {
 335         [STMPE_IDX_CHIP_ID]     = STMPE801_REG_CHIP_ID,
 336         [STMPE_IDX_ICR_LSB]     = STMPE801_REG_SYS_CTRL,
 337         [STMPE_IDX_GPMR_LSB]    = STMPE801_REG_GPIO_MP_STA,
 338         [STMPE_IDX_GPSR_LSB]    = STMPE801_REG_GPIO_SET_PIN,
 339         [STMPE_IDX_GPCR_LSB]    = STMPE801_REG_GPIO_SET_PIN,
 340         [STMPE_IDX_GPDR_LSB]    = STMPE801_REG_GPIO_DIR,
 341         [STMPE_IDX_IEGPIOR_LSB] = STMPE801_REG_GPIO_INT_EN,
 342         [STMPE_IDX_ISGPIOR_MSB] = STMPE801_REG_GPIO_INT_STA,
 343
 344 };
 345
 346 static struct stmpe_variant_block stmpe801_blocks[] = {
 347         {
 348                 .cell   = &stmpe_gpio_cell,
 349                 .irq    = 0,
 350                 .block  = STMPE_BLOCK_GPIO,
 351         },
 352 };
 353
 354 static struct stmpe_variant_block stmpe801_blocks_noirq[] = {
 355         {
 356                 .cell   = &stmpe_gpio_cell_noirq,
 357                 .block  = STMPE_BLOCK_GPIO,
 358         },
 359 };
 360
 361 static int stmpe801_enable(struct stmpe *stmpe, unsigned int blocks,
 362                            bool enable)
 363 {
 364         if (blocks & STMPE_BLOCK_GPIO)
 365                 return 0;
 366         else
 367                 return -EINVAL;
 368 }
 369
 370 static struct stmpe_variant_info stmpe801 = {
 371         .name           = "stmpe801",
 372         .id_val         = STMPE801_ID,
 373         .id_mask        = 0xffff,
 374         .num_gpios      = 8,
 375         .regs           = stmpe801_regs,
 376         .blocks         = stmpe801_blocks,
 377         .num_blocks     = ARRAY_SIZE(stmpe801_blocks),
 378         .num_irqs       = STMPE801_NR_INTERNAL_IRQS,
 379         .enable         = stmpe801_enable,
 380 };
 381
 382 static struct stmpe_variant_info stmpe801_noirq = {
 383         .name           = "stmpe801",
 384         .id_val         = STMPE801_ID,
 385         .id_mask        = 0xffff,
 386         .num_gpios      = 8,
 387         .regs           = stmpe801_regs,
 388         .blocks         = stmpe801_blocks_noirq,
 389         .num_blocks     = ARRAY_SIZE(stmpe801_blocks_noirq),
 390         .enable         = stmpe801_enable,
 391 };
 392
 393 /*
 394  * Touchscreen (STMPE811 or STMPE610)
 395  */
 396
 397 static struct resource stmpe_ts_resources[] = {
 398         {
 399                 .name   = "TOUCH_DET",
 400                 .start  = 0,
 401                 .end    = 0,
 402                 .flags  = IORESOURCE_IRQ,
 403         },
 404         {
 405                 .name   = "FIFO_TH",
 406                 .start  = 1,
 407                 .end    = 1,
 408                 .flags  = IORESOURCE_IRQ,
 409         },
 410 };
 411
 412 static struct mfd_cell stmpe_ts_cell = {
 413         .name           = "stmpe-ts",
 414         .resources      = stmpe_ts_resources,
 415         .num_resources  = ARRAY_SIZE(stmpe_ts_resources),
 416 };
 417
 418 /*
 419  * STMPE811 or STMPE610
 420  */
 421
 422 static const u8 stmpe811_regs[] = {
 423         [STMPE_IDX_CHIP_ID]     = STMPE811_REG_CHIP_ID,
 424         [STMPE_IDX_ICR_LSB]     = STMPE811_REG_INT_CTRL,
 425         [STMPE_IDX_IER_LSB]     = STMPE811_REG_INT_EN,
 426         [STMPE_IDX_ISR_MSB]     = STMPE811_REG_INT_STA,
 427         [STMPE_IDX_GPMR_LSB]    = STMPE811_REG_GPIO_MP_STA,
 428         [STMPE_IDX_GPSR_LSB]    = STMPE811_REG_GPIO_SET_PIN,
 429         [STMPE_IDX_GPCR_LSB]    = STMPE811_REG_GPIO_CLR_PIN,
 430         [STMPE_IDX_GPDR_LSB]    = STMPE811_REG_GPIO_DIR,
 431         [STMPE_IDX_GPRER_LSB]   = STMPE811_REG_GPIO_RE,
 432         [STMPE_IDX_GPFER_LSB]   = STMPE811_REG_GPIO_FE,
 433         [STMPE_IDX_GPAFR_U_MSB] = STMPE811_REG_GPIO_AF,
 434         [STMPE_IDX_IEGPIOR_LSB] = STMPE811_REG_GPIO_INT_EN,
 435         [STMPE_IDX_ISGPIOR_MSB] = STMPE811_REG_GPIO_INT_STA,
 436         [STMPE_IDX_GPEDR_MSB]   = STMPE811_REG_GPIO_ED,
 437 };
 438
 439 static struct stmpe_variant_block stmpe811_blocks[] = {
 440         {
 441                 .cell   = &stmpe_gpio_cell,
 442                 .irq    = STMPE811_IRQ_GPIOC,
 443                 .block  = STMPE_BLOCK_GPIO,
 444         },
 445         {
 446                 .cell   = &stmpe_ts_cell,
 447                 .irq    = STMPE811_IRQ_TOUCH_DET,
 448                 .block  = STMPE_BLOCK_TOUCHSCREEN,
 449         },
 450 };
 451
 452 static int stmpe811_enable(struct stmpe *stmpe, unsigned int blocks,
 453                            bool enable)
 454 {
 455         unsigned int mask = 0;
 456
 457         if (blocks & STMPE_BLOCK_GPIO)
 458                 mask |= STMPE811_SYS_CTRL2_GPIO_OFF;
 459
 460         if (blocks & STMPE_BLOCK_ADC)
 461                 mask |= STMPE811_SYS_CTRL2_ADC_OFF;
 462
 463         if (blocks & STMPE_BLOCK_TOUCHSCREEN)
 464                 mask |= STMPE811_SYS_CTRL2_TSC_OFF;
 465
 466         return __stmpe_set_bits(stmpe, STMPE811_REG_SYS_CTRL2, mask,
 467                                 enable ? 0 : mask);
 468 }
 469
 470 static int stmpe811_get_altfunc(struct stmpe *stmpe, enum stmpe_block block)
 471 {
 472         /* 0 for touchscreen, 1 for GPIO */
 473         return block != STMPE_BLOCK_TOUCHSCREEN;
 474 }
 475
 476 static struct stmpe_variant_info stmpe811 = {
 477         .name           = "stmpe811",
 478         .id_val         = 0x0811,
 479         .id_mask        = 0xffff,
 480         .num_gpios      = 8,
 481         .af_bits        = 1,
 482         .regs           = stmpe811_regs,
 483         .blocks         = stmpe811_blocks,
 484         .num_blocks     = ARRAY_SIZE(stmpe811_blocks),
 485         .num_irqs       = STMPE811_NR_INTERNAL_IRQS,
 486         .enable         = stmpe811_enable,
 487         .get_altfunc    = stmpe811_get_altfunc,
 488 };
 489
 490 /* Similar to 811, except number of gpios */
 491 static struct stmpe_variant_info stmpe610 = {
 492         .name           = "stmpe610",
 493         .id_val         = 0x0811,
 494         .id_mask        = 0xffff,
 495         .num_gpios      = 6,
 496         .af_bits        = 1,
 497         .regs           = stmpe811_regs,
 498         .blocks         = stmpe811_blocks,
 499         .num_blocks     = ARRAY_SIZE(stmpe811_blocks),
 500         .num_irqs       = STMPE811_NR_INTERNAL_IRQS,
 501         .enable         = stmpe811_enable,
 502         .get_altfunc    = stmpe811_get_altfunc,
 503 };
 504
 505 /*
 506  * STMPE1601
 507  */
 508
 509 static const u8 stmpe1601_regs[] = {
 510         [STMPE_IDX_CHIP_ID]     = STMPE1601_REG_CHIP_ID,
 511         [STMPE_IDX_ICR_LSB]     = STMPE1601_REG_ICR_LSB,
 512         [STMPE_IDX_IER_LSB]     = STMPE1601_REG_IER_LSB,
 513         [STMPE_IDX_ISR_MSB]     = STMPE1601_REG_ISR_MSB,
 514         [STMPE_IDX_GPMR_LSB]    = STMPE1601_REG_GPIO_MP_LSB,
 515         [STMPE_IDX_GPSR_LSB]    = STMPE1601_REG_GPIO_SET_LSB,
 516         [STMPE_IDX_GPCR_LSB]    = STMPE1601_REG_GPIO_CLR_LSB,
 517         [STMPE_IDX_GPDR_LSB]    = STMPE1601_REG_GPIO_SET_DIR_LSB,
 518         [STMPE_IDX_GPRER_LSB]   = STMPE1601_REG_GPIO_RE_LSB,
 519         [STMPE_IDX_GPFER_LSB]   = STMPE1601_REG_GPIO_FE_LSB,
 520         [STMPE_IDX_GPAFR_U_MSB] = STMPE1601_REG_GPIO_AF_U_MSB,
 521         [STMPE_IDX_IEGPIOR_LSB] = STMPE1601_REG_INT_EN_GPIO_MASK_LSB,
 522         [STMPE_IDX_ISGPIOR_MSB] = STMPE1601_REG_INT_STA_GPIO_MSB,
 523         [STMPE_IDX_GPEDR_MSB]   = STMPE1601_REG_GPIO_ED_MSB,
 524 };
 525
 526 static struct stmpe_variant_block stmpe1601_blocks[] = {
 527         {
 528                 .cell   = &stmpe_gpio_cell,
 529                 .irq    = STMPE24XX_IRQ_GPIOC,
 530                 .block  = STMPE_BLOCK_GPIO,
 531         },
 532         {
 533                 .cell   = &stmpe_keypad_cell,
 534                 .irq    = STMPE24XX_IRQ_KEYPAD,
 535                 .block  = STMPE_BLOCK_KEYPAD,
 536         },
 537 };
 538
 539 /* supported autosleep timeout delay (in msecs) */
 540 static const int stmpe_autosleep_delay[] = {
 541         4, 16, 32, 64, 128, 256, 512, 1024,
 542 };
 543
 544 static int stmpe_round_timeout(int timeout)
 545 {
 546         int i;
 547
 548         for (i = 0; i < ARRAY_SIZE(stmpe_autosleep_delay); i++) {
 549                 if (stmpe_autosleep_delay[i] >= timeout)
 550                         return i;
 551         }
 552
 553         /*
 554          * requests for delays longer than supported should not return the
 555          * longest supported delay
 556          */
 557         return -EINVAL;
 558 }
 559
 560 static int stmpe_autosleep(struct stmpe *stmpe, int autosleep_timeout)
 561 {
 562         int ret;
 563
 564         if (!stmpe->variant->enable_autosleep)
 565                 return -ENOSYS;
 566
 567         mutex_lock(&stmpe->lock);
 568         ret = stmpe->variant->enable_autosleep(stmpe, autosleep_timeout);
 569         mutex_unlock(&stmpe->lock);
 570
 571         return ret;
 572 }
 573
 574 /*
 575  * Both stmpe 1601/2403 support same layout for autosleep
 576  */
 577 static int stmpe1601_autosleep(struct stmpe *stmpe,
 578                 int autosleep_timeout)
 579 {
 580         int ret, timeout;
 581
 582         /* choose the best available timeout */
 583         timeout = stmpe_round_timeout(autosleep_timeout);
 584         if (timeout < 0) {
 585                 dev_err(stmpe->dev, "invalid timeout\n");
 586                 return timeout;
 587         }
 588
 589         ret = __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL2,
 590                         STMPE1601_AUTOSLEEP_TIMEOUT_MASK,
 591                         timeout);
 592         if (ret < 0)
 593                 return ret;
 594
 595         return __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL2,
 596                         STPME1601_AUTOSLEEP_ENABLE,
 597                         STPME1601_AUTOSLEEP_ENABLE);
 598 }
 599
 600 static int stmpe1601_enable(struct stmpe *stmpe, unsigned int blocks,
 601                             bool enable)
 602 {
 603         unsigned int mask = 0;
 604
 605         if (blocks & STMPE_BLOCK_GPIO)
 606                 mask |= STMPE1601_SYS_CTRL_ENABLE_GPIO;
 607
 608         if (blocks & STMPE_BLOCK_KEYPAD)
 609                 mask |= STMPE1601_SYS_CTRL_ENABLE_KPC;
 610
 611         return __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL, mask,
 612                                 enable ? mask : 0);
 613 }
 614
 615 static int stmpe1601_get_altfunc(struct stmpe *stmpe, enum stmpe_block block)
 616 {
 617         switch (block) {
 618         case STMPE_BLOCK_PWM:
 619                 return 2;
 620
 621         case STMPE_BLOCK_KEYPAD:
 622                 return 1;
 623
 624         case STMPE_BLOCK_GPIO:
 625         default:
 626                 return 0;
 627         }
 628 }
 629
 630 static struct stmpe_variant_info stmpe1601 = {
 631         .name           = "stmpe1601",
 632         .id_val         = 0x0210,
 633         .id_mask        = 0xfff0,       /* at least 0x0210 and 0x0212 */
 634         .num_gpios      = 16,
 635         .af_bits        = 2,
 636         .regs           = stmpe1601_regs,
 637         .blocks         = stmpe1601_blocks,
 638         .num_blocks     = ARRAY_SIZE(stmpe1601_blocks),
 639         .num_irqs       = STMPE1601_NR_INTERNAL_IRQS,
 640         .enable         = stmpe1601_enable,
 641         .get_altfunc    = stmpe1601_get_altfunc,
 642         .enable_autosleep       = stmpe1601_autosleep,
 643 };
 644
 645 /*
 646  * STMPE24XX
 647  */
 648
 649 static const u8 stmpe24xx_regs[] = {
 650         [STMPE_IDX_CHIP_ID]     = STMPE24XX_REG_CHIP_ID,
 651         [STMPE_IDX_ICR_LSB]     = STMPE24XX_REG_ICR_LSB,
 652         [STMPE_IDX_IER_LSB]     = STMPE24XX_REG_IER_LSB,
 653         [STMPE_IDX_ISR_MSB]     = STMPE24XX_REG_ISR_MSB,
 654         [STMPE_IDX_GPMR_LSB]    = STMPE24XX_REG_GPMR_LSB,
 655         [STMPE_IDX_GPSR_LSB]    = STMPE24XX_REG_GPSR_LSB,
 656         [STMPE_IDX_GPCR_LSB]    = STMPE24XX_REG_GPCR_LSB,
 657         [STMPE_IDX_GPDR_LSB]    = STMPE24XX_REG_GPDR_LSB,
 658         [STMPE_IDX_GPRER_LSB]   = STMPE24XX_REG_GPRER_LSB,
 659         [STMPE_IDX_GPFER_LSB]   = STMPE24XX_REG_GPFER_LSB,
 660         [STMPE_IDX_GPAFR_U_MSB] = STMPE24XX_REG_GPAFR_U_MSB,
 661         [STMPE_IDX_IEGPIOR_LSB] = STMPE24XX_REG_IEGPIOR_LSB,
 662         [STMPE_IDX_ISGPIOR_MSB] = STMPE24XX_REG_ISGPIOR_MSB,
 663         [STMPE_IDX_GPEDR_MSB]   = STMPE24XX_REG_GPEDR_MSB,
 664 };
 665
 666 static struct stmpe_variant_block stmpe24xx_blocks[] = {
 667         {
 668                 .cell   = &stmpe_gpio_cell,
 669                 .irq    = STMPE24XX_IRQ_GPIOC,
 670                 .block  = STMPE_BLOCK_GPIO,
 671         },
 672         {
 673                 .cell   = &stmpe_keypad_cell,
 674                 .irq    = STMPE24XX_IRQ_KEYPAD,
 675                 .block  = STMPE_BLOCK_KEYPAD,
 676         },
 677 };
 678
 679 static int stmpe24xx_enable(struct stmpe *stmpe, unsigned int blocks,
 680                             bool enable)
 681 {
 682         unsigned int mask = 0;
 683
 684         if (blocks & STMPE_BLOCK_GPIO)
 685                 mask |= STMPE24XX_SYS_CTRL_ENABLE_GPIO;
 686
 687         if (blocks & STMPE_BLOCK_KEYPAD)
 688                 mask |= STMPE24XX_SYS_CTRL_ENABLE_KPC;
 689
 690         return __stmpe_set_bits(stmpe, STMPE24XX_REG_SYS_CTRL, mask,
 691                                 enable ? mask : 0);
 692 }
 693
 694 static int stmpe24xx_get_altfunc(struct stmpe *stmpe, enum stmpe_block block)
 695 {
 696         switch (block) {
 697         case STMPE_BLOCK_ROTATOR:
 698                 return 2;
 699
 700         case STMPE_BLOCK_KEYPAD:
 701                 return 1;
 702
 703         case STMPE_BLOCK_GPIO:
 704         default:
 705                 return 0;
 706         }
 707 }
 708
 709 static struct stmpe_variant_info stmpe2401 = {
 710         .name           = "stmpe2401",
 711         .id_val         = 0x0101,
 712         .id_mask        = 0xffff,
 713         .num_gpios      = 24,
 714         .af_bits        = 2,
 715         .regs           = stmpe24xx_regs,
 716         .blocks         = stmpe24xx_blocks,
 717         .num_blocks     = ARRAY_SIZE(stmpe24xx_blocks),
 718         .num_irqs       = STMPE24XX_NR_INTERNAL_IRQS,
 719         .enable         = stmpe24xx_enable,
 720         .get_altfunc    = stmpe24xx_get_altfunc,
 721 };
 722
 723 static struct stmpe_variant_info stmpe2403 = {
 724         .name           = "stmpe2403",
 725         .id_val         = 0x0120,
 726         .id_mask        = 0xffff,
 727         .num_gpios      = 24,
 728         .af_bits        = 2,
 729         .regs           = stmpe24xx_regs,
 730         .blocks         = stmpe24xx_blocks,
 731         .num_blocks     = ARRAY_SIZE(stmpe24xx_blocks),
 732         .num_irqs       = STMPE24XX_NR_INTERNAL_IRQS,
 733         .enable         = stmpe24xx_enable,
 734         .get_altfunc    = stmpe24xx_get_altfunc,
 735         .enable_autosleep       = stmpe1601_autosleep, /* same as stmpe1601 */
 736 };
 737
 738 static struct stmpe_variant_info *stmpe_variant_info[STMPE_NBR_PARTS] = {
 739         [STMPE610]      = &stmpe610,
 740         [STMPE801]      = &stmpe801,
 741         [STMPE811]      = &stmpe811,
 742         [STMPE1601]     = &stmpe1601,
 743         [STMPE2401]     = &stmpe2401,
 744         [STMPE2403]     = &stmpe2403,
 745 };
 746
 747 /*
 748  * These devices can be connected in a 'no-irq' configuration - the irq pin
 749  * is not used and the device cannot interrupt the CPU. Here we only list
 750  * devices which support this configuration - the driver will fail probing
 751  * for any devices not listed here which are configured in this way.
 752  */
 753 static struct stmpe_variant_info *stmpe_noirq_variant_info[STMPE_NBR_PARTS] = {
 754         [STMPE801]      = &stmpe801_noirq,
 755 };
 756
 757 static irqreturn_t stmpe_irq(int irq, void *data)
 758 {
 759         struct stmpe *stmpe = data;
 760         struct stmpe_variant_info *variant = stmpe->variant;
 761         int num = DIV_ROUND_UP(variant->num_irqs, 8);
 762         u8 israddr = stmpe->regs[STMPE_IDX_ISR_MSB];
 763         u8 isr[num];
 764         int ret;
 765         int i;
 766
 767         if (variant->id_val == STMPE801_ID) {
 768                 handle_nested_irq(stmpe->irq_base);
 769                 return IRQ_HANDLED;
 770         }
 771
 772         ret = stmpe_block_read(stmpe, israddr, num, isr);
 773         if (ret < 0)
 774                 return IRQ_NONE;
 775
 776         for (i = 0; i < num; i++) {
 777                 int bank = num - i - 1;
 778                 u8 status = isr[i];
 779                 u8 clear;
 780
 781                 status &= stmpe->ier[bank];
 782                 if (!status)
 783                         continue;
 784
 785                 clear = status;
 786                 while (status) {
 787                         int bit = __ffs(status);
 788                         int line = bank * 8 + bit;
 789
 790                         handle_nested_irq(stmpe->irq_base + line);
 791                         status &= ~(1 << bit);
 792                 }
 793
 794                 stmpe_reg_write(stmpe, israddr + i, clear);
 795         }
 796
 797         return IRQ_HANDLED;
 798 }
 799
 800 static void stmpe_irq_lock(struct irq_data *data)
 801 {
 802         struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
 803
 804         mutex_lock(&stmpe->irq_lock);
 805 }
 806
 807 static void stmpe_irq_sync_unlock(struct irq_data *data)
 808 {
 809         struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
 810         struct stmpe_variant_info *variant = stmpe->variant;
 811         int num = DIV_ROUND_UP(variant->num_irqs, 8);
 812         int i;
 813
 814         for (i = 0; i < num; i++) {
 815                 u8 new = stmpe->ier[i];
 816                 u8 old = stmpe->oldier[i];
 817
 818                 if (new == old)
 819                         continue;
 820
 821                 stmpe->oldier[i] = new;
 822                 stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_IER_LSB] - i, new);
 823         }
 824
 825         mutex_unlock(&stmpe->irq_lock);
 826 }
 827
 828 static void stmpe_irq_mask(struct irq_data *data)
 829 {
 830         struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
 831         int offset = data->irq - stmpe->irq_base;
 832         int regoffset = offset / 8;
 833         int mask = 1 << (offset % 8);
 834
 835         stmpe->ier[regoffset] &= ~mask;
 836 }
 837
 838 static void stmpe_irq_unmask(struct irq_data *data)
 839 {
 840         struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
 841         int offset = data->irq - stmpe->irq_base;
 842         int regoffset = offset / 8;
 843         int mask = 1 << (offset % 8);
 844
 845         stmpe->ier[regoffset] |= mask;
 846 }
 847
 848 static struct irq_chip stmpe_irq_chip = {
 849         .name                   = "stmpe",
 850         .irq_bus_lock           = stmpe_irq_lock,
 851         .irq_bus_sync_unlock    = stmpe_irq_sync_unlock,
 852         .irq_mask               = stmpe_irq_mask,
 853         .irq_unmask             = stmpe_irq_unmask,
 854 };
 855
 856 static int __devinit stmpe_irq_init(struct stmpe *stmpe)
 857 {
 858         struct irq_chip *chip = NULL;
 859         int num_irqs = stmpe->variant->num_irqs;
 860         int base = stmpe->irq_base;
 861         int irq;
 862
 863         if (stmpe->variant->id_val != STMPE801_ID)
 864                 chip = &stmpe_irq_chip;
 865
 866         for (irq = base; irq < base + num_irqs; irq++) {
 867                 irq_set_chip_data(irq, stmpe);
 868                 irq_set_chip_and_handler(irq, chip, handle_edge_irq);
 869                 irq_set_nested_thread(irq, 1);
 870 #ifdef CONFIG_ARM
 871                 set_irq_flags(irq, IRQF_VALID);
 872 #else
 873                 irq_set_noprobe(irq);
 874 #endif
 875         }
 876
 877         return 0;
 878 }
 879
 880 static void stmpe_irq_remove(struct stmpe *stmpe)
 881 {
 882         int num_irqs = stmpe->variant->num_irqs;
 883         int base = stmpe->irq_base;
 884         int irq;
 885
 886         for (irq = base; irq < base + num_irqs; irq++) {
 887 #ifdef CONFIG_ARM
 888                 set_irq_flags(irq, 0);
 889 #endif
 890                 irq_set_chip_and_handler(irq, NULL, NULL);
 891                 irq_set_chip_data(irq, NULL);
 892         }
 893 }
 894
 895 static int __devinit stmpe_chip_init(struct stmpe *stmpe)
 896 {
 897         unsigned int irq_trigger = stmpe->pdata->irq_trigger;
 898         int autosleep_timeout = stmpe->pdata->autosleep_timeout;
 899         struct stmpe_variant_info *variant = stmpe->variant;
 900         u8 icr = 0;
 901         unsigned int id;
 902         u8 data[2];
 903         int ret;
 904
 905         ret = stmpe_block_read(stmpe, stmpe->regs[STMPE_IDX_CHIP_ID],
 906                                ARRAY_SIZE(data), data);
 907         if (ret < 0)
 908                 return ret;
 909
 910         id = (data[0] << 8) | data[1];
 911         if ((id & variant->id_mask) != variant->id_val) {
 912                 dev_err(stmpe->dev, "unknown chip id: %#x\n", id);
 913                 return -EINVAL;
 914         }
 915
 916         dev_info(stmpe->dev, "%s detected, chip id: %#x\n", variant->name, id);
 917
 918         /* Disable all modules -- subdrivers should enable what they need. */
 919         ret = stmpe_disable(stmpe, ~0);
 920         if (ret)
 921                 return ret;
 922
 923         if (stmpe->irq >= 0) {
 924                 if (id == STMPE801_ID)
 925                         icr = STMPE801_REG_SYS_CTRL_INT_EN;
 926                 else
 927                         icr = STMPE_ICR_LSB_GIM;
 928
 929                 /* STMPE801 doesn't support Edge interrupts */
 930                 if (id != STMPE801_ID) {
 931                         if (irq_trigger == IRQF_TRIGGER_FALLING ||
 932                                         irq_trigger == IRQF_TRIGGER_RISING)
 933                                 icr |= STMPE_ICR_LSB_EDGE;
 934                 }
 935
 936                 if (irq_trigger == IRQF_TRIGGER_RISING ||
 937                                 irq_trigger == IRQF_TRIGGER_HIGH) {
 938                         if (id == STMPE801_ID)
 939                                 icr |= STMPE801_REG_SYS_CTRL_INT_HI;
 940                         else
 941                                 icr |= STMPE_ICR_LSB_HIGH;
 942                 }
 943
 944                 if (stmpe->pdata->irq_invert_polarity) {
 945                         if (id == STMPE801_ID)
 946                                 icr ^= STMPE801_REG_SYS_CTRL_INT_HI;
 947                         else
 948                                 icr ^= STMPE_ICR_LSB_HIGH;
 949                 }
 950         }
 951
 952         if (stmpe->pdata->autosleep) {
 953                 ret = stmpe_autosleep(stmpe, autosleep_timeout);
 954                 if (ret)
 955                         return ret;
 956         }
 957
 958         return stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_ICR_LSB], icr);
 959 }
 960
 961 static int __devinit stmpe_add_device(struct stmpe *stmpe,
 962                                       struct mfd_cell *cell, int irq)
 963 {
 964         return mfd_add_devices(stmpe->dev, stmpe->pdata->id, cell, 1,
 965                                NULL, stmpe->irq_base + irq);
 966 }
 967
 968 static int __devinit stmpe_devices_init(struct stmpe *stmpe)
 969 {
 970         struct stmpe_variant_info *variant = stmpe->variant;
 971         unsigned int platform_blocks = stmpe->pdata->blocks;
 972         int ret = -EINVAL;
 973         int i;
 974
 975         for (i = 0; i < variant->num_blocks; i++) {
 976                 struct stmpe_variant_block *block = &variant->blocks[i];
 977
 978                 if (!(platform_blocks & block->block))
 979                         continue;
 980
 981                 platform_blocks &= ~block->block;
 982                 ret = stmpe_add_device(stmpe, block->cell, block->irq);
 983                 if (ret)
 984                         return ret;
 985         }
 986
 987         if (platform_blocks)
 988                 dev_warn(stmpe->dev,
 989                          "platform wants blocks (%#x) not present on variant",
 990                          platform_blocks);
 991
 992         return ret;
 993 }
 994
 995 /* Called from client specific probe routines */
 996 int __devinit stmpe_probe(struct stmpe_client_info *ci, int partnum)
 997 {
 998         struct stmpe_platform_data *pdata = dev_get_platdata(ci->dev);
 999         struct stmpe *stmpe;
1000         int ret;
1001
1002         if (!pdata)
1003                 return -EINVAL;
1004
1005         stmpe = kzalloc(sizeof(struct stmpe), GFP_KERNEL);
1006         if (!stmpe)
1007                 return -ENOMEM;
1008
1009         mutex_init(&stmpe->irq_lock);
1010         mutex_init(&stmpe->lock);
1011
1012         stmpe->dev = ci->dev;
1013         stmpe->client = ci->client;
1014         stmpe->pdata = pdata;
1015         stmpe->irq_base = pdata->irq_base;
1016         stmpe->ci = ci;
1017         stmpe->partnum = partnum;
1018         stmpe->variant = stmpe_variant_info[partnum];
1019         stmpe->regs = stmpe->variant->regs;
1020         stmpe->num_gpios = stmpe->variant->num_gpios;
1021         dev_set_drvdata(stmpe->dev, stmpe);
1022
1023         if (ci->init)
1024                 ci->init(stmpe);
1025
1026         if (pdata->irq_over_gpio) {
1027                 ret = gpio_request_one(pdata->irq_gpio, GPIOF_DIR_IN, "stmpe");
1028                 if (ret) {
1029                         dev_err(stmpe->dev, "failed to request IRQ GPIO: %d\n",
1030                                         ret);
1031                         goto out_free;
1032                 }
1033
1034                 stmpe->irq = gpio_to_irq(pdata->irq_gpio);
1035         } else {
1036                 stmpe->irq = ci->irq;
1037         }
1038
1039         if (stmpe->irq < 0) {
1040                 /* use alternate variant info for no-irq mode, if supported */
1041                 dev_info(stmpe->dev,
1042                         "%s configured in no-irq mode by platform data\n",
1043                         stmpe->variant->name);
1044                 if (!stmpe_noirq_variant_info[stmpe->partnum]) {
1045                         dev_err(stmpe->dev,
1046                                 "%s does not support no-irq mode!\n",
1047                                 stmpe->variant->name);
1048                         ret = -ENODEV;
1049                         goto free_gpio;
1050                 }
1051                 stmpe->variant = stmpe_noirq_variant_info[stmpe->partnum];
1052         }
1053
1054         ret = stmpe_chip_init(stmpe);
1055         if (ret)
1056                 goto free_gpio;
1057
1058         if (stmpe->irq >= 0) {
1059                 ret = stmpe_irq_init(stmpe);
1060                 if (ret)
1061                         goto free_gpio;
1062
1063                 ret = request_threaded_irq(stmpe->irq, NULL, stmpe_irq,
1064                                 pdata->irq_trigger | IRQF_ONESHOT,
1065                                 "stmpe", stmpe);
1066                 if (ret) {
1067                         dev_err(stmpe->dev, "failed to request IRQ: %d\n",
1068                                         ret);
1069                         goto out_removeirq;
1070                 }
1071         }
1072
1073         ret = stmpe_devices_init(stmpe);
1074         if (ret) {
1075                 dev_err(stmpe->dev, "failed to add children\n");
1076                 goto out_removedevs;
1077         }
1078
1079         return 0;
1080
1081 out_removedevs:
1082         mfd_remove_devices(stmpe->dev);
1083         if (stmpe->irq >= 0)
1084                 free_irq(stmpe->irq, stmpe);
1085 out_removeirq:
1086         if (stmpe->irq >= 0)
1087                 stmpe_irq_remove(stmpe);
1088 free_gpio:
1089         if (pdata->irq_over_gpio)
1090                 gpio_free(pdata->irq_gpio);
1091 out_free:
1092         kfree(stmpe);
1093         return ret;
1094 }
1095
1096 int stmpe_remove(struct stmpe *stmpe)
1097 {
1098         mfd_remove_devices(stmpe->dev);
1099
1100         if (stmpe->irq >= 0) {
1101                 free_irq(stmpe->irq, stmpe);
1102                 stmpe_irq_remove(stmpe);
1103         }
1104
1105         if (stmpe->pdata->irq_over_gpio)
1106                 gpio_free(stmpe->pdata->irq_gpio);
1107
1108         kfree(stmpe);
1109
1110         return 0;
1111 }
1112
1113 #ifdef CONFIG_PM
1114 static int stmpe_suspend(struct device *dev)
1115 {
1116         struct stmpe *stmpe = dev_get_drvdata(dev);
1117
1118         if (stmpe->irq >= 0 && device_may_wakeup(dev))
1119                 enable_irq_wake(stmpe->irq);
1120
1121         return 0;
1122 }
1123
1124 static int stmpe_resume(struct device *dev)
1125 {
1126         struct stmpe *stmpe = dev_get_drvdata(dev);
1127
1128         if (stmpe->irq >= 0 && device_may_wakeup(dev))
1129                 disable_irq_wake(stmpe->irq);
1130
1131         return 0;
1132 }
1133
1134 const struct dev_pm_ops stmpe_dev_pm_ops = {
1135         .suspend        = stmpe_suspend,
1136         .resume         = stmpe_resume,
1137 };
1138 #endif