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/err.h>
  11 #include <linux/gpio.h>
  12 #include <linux/export.h>
  13 #include <linux/kernel.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/irq.h>
  16 #include <linux/irqdomain.h>
  17 #include <linux/of.h>
  18 #include <linux/of_gpio.h>
  19 #include <linux/pm.h>
  20 #include <linux/slab.h>
  21 #include <linux/mfd/core.h>
  22 #include <linux/delay.h>
  23 #include <linux/regulator/consumer.h>
  24 #include "stmpe.h"
  25
  26 static int __stmpe_enable(struct stmpe *stmpe, unsigned int blocks)
  27 {
  28         return stmpe->variant->enable(stmpe, blocks, true);
  29 }
  30
  31 static int __stmpe_disable(struct stmpe *stmpe, unsigned int blocks)
  32 {
  33         return stmpe->variant->enable(stmpe, blocks, false);
  34 }
  35
  36 static int __stmpe_reg_read(struct stmpe *stmpe, u8 reg)
  37 {
  38         int ret;
  39
  40         ret = stmpe->ci->read_byte(stmpe, reg);
  41         if (ret < 0)
  42                 dev_err(stmpe->dev, "failed to read reg %#x: %d\n", reg, ret);
  43
  44         dev_vdbg(stmpe->dev, "rd: reg %#x => data %#x\n", reg, ret);
  45
  46         return ret;
  47 }
  48
  49 static int __stmpe_reg_write(struct stmpe *stmpe, u8 reg, u8 val)
  50 {
  51         int ret;
  52
  53         dev_vdbg(stmpe->dev, "wr: reg %#x <= %#x\n", reg, val);
  54
  55         ret = stmpe->ci->write_byte(stmpe, reg, val);
  56         if (ret < 0)
  57                 dev_err(stmpe->dev, "failed to write reg %#x: %d\n", reg, ret);
  58
  59         return ret;
  60 }
  61
  62 static int __stmpe_set_bits(struct stmpe *stmpe, u8 reg, u8 mask, u8 val)
  63 {
  64         int ret;
  65
  66         ret = __stmpe_reg_read(stmpe, reg);
  67         if (ret < 0)
  68                 return ret;
  69
  70         ret &= ~mask;
  71         ret |= val;
  72
  73         return __stmpe_reg_write(stmpe, reg, ret);
  74 }
  75
  76 static int __stmpe_block_read(struct stmpe *stmpe, u8 reg, u8 length,
  77                               u8 *values)
  78 {
  79         int ret;
  80
  81         ret = stmpe->ci->read_block(stmpe, reg, length, values);
  82         if (ret < 0)
  83                 dev_err(stmpe->dev, "failed to read regs %#x: %d\n", reg, ret);
  84
  85         dev_vdbg(stmpe->dev, "rd: reg %#x (%d) => ret %#x\n", reg, length, ret);
  86         stmpe_dump_bytes("stmpe rd: ", values, length);
  87
  88         return ret;
  89 }
  90
  91 static int __stmpe_block_write(struct stmpe *stmpe, u8 reg, u8 length,
  92                         const u8 *values)
  93 {
  94         int ret;
  95
  96         dev_vdbg(stmpe->dev, "wr: regs %#x (%d)\n", reg, length);
  97         stmpe_dump_bytes("stmpe wr: ", values, length);
  98
  99         ret = stmpe->ci->write_block(stmpe, reg, length, values);
 100         if (ret < 0)
 101                 dev_err(stmpe->dev, "failed to write regs %#x: %d\n", reg, ret);
 102
 103         return ret;
 104 }
 105
 106 /**
 107  * stmpe_enable - enable blocks on an STMPE device
 108  * @stmpe:      Device to work on
 109  * @blocks:     Mask of blocks (enum stmpe_block values) to enable
 110  */
 111 int stmpe_enable(struct stmpe *stmpe, unsigned int blocks)
 112 {
 113         int ret;
 114
 115         mutex_lock(&stmpe->lock);
 116         ret = __stmpe_enable(stmpe, blocks);
 117         mutex_unlock(&stmpe->lock);
 118
 119         return ret;
 120 }
 121 EXPORT_SYMBOL_GPL(stmpe_enable);
 122
 123 /**
 124  * stmpe_disable - disable blocks on an STMPE device
 125  * @stmpe:      Device to work on
 126  * @blocks:     Mask of blocks (enum stmpe_block values) to enable
 127  */
 128 int stmpe_disable(struct stmpe *stmpe, unsigned int blocks)
 129 {
 130         int ret;
 131
 132         mutex_lock(&stmpe->lock);
 133         ret = __stmpe_disable(stmpe, blocks);
 134         mutex_unlock(&stmpe->lock);
 135
 136         return ret;
 137 }
 138 EXPORT_SYMBOL_GPL(stmpe_disable);
 139
 140 /**
 141  * stmpe_reg_read() - read a single STMPE register
 142  * @stmpe:      Device to read from
 143  * @reg:        Register to read
 144  */
 145 int stmpe_reg_read(struct stmpe *stmpe, u8 reg)
 146 {
 147         int ret;
 148
 149         mutex_lock(&stmpe->lock);
 150         ret = __stmpe_reg_read(stmpe, reg);
 151         mutex_unlock(&stmpe->lock);
 152
 153         return ret;
 154 }
 155 EXPORT_SYMBOL_GPL(stmpe_reg_read);
 156
 157 /**
 158  * stmpe_reg_write() - write a single STMPE register
 159  * @stmpe:      Device to write to
 160  * @reg:        Register to write
 161  * @val:        Value to write
 162  */
 163 int stmpe_reg_write(struct stmpe *stmpe, u8 reg, u8 val)
 164 {
 165         int ret;
 166
 167         mutex_lock(&stmpe->lock);
 168         ret = __stmpe_reg_write(stmpe, reg, val);
 169         mutex_unlock(&stmpe->lock);
 170
 171         return ret;
 172 }
 173 EXPORT_SYMBOL_GPL(stmpe_reg_write);
 174
 175 /**
 176  * stmpe_set_bits() - set the value of a bitfield in a STMPE register
 177  * @stmpe:      Device to write to
 178  * @reg:        Register to write
 179  * @mask:       Mask of bits to set
 180  * @val:        Value to set
 181  */
 182 int stmpe_set_bits(struct stmpe *stmpe, u8 reg, u8 mask, u8 val)
 183 {
 184         int ret;
 185
 186         mutex_lock(&stmpe->lock);
 187         ret = __stmpe_set_bits(stmpe, reg, mask, val);
 188         mutex_unlock(&stmpe->lock);
 189
 190         return ret;
 191 }
 192 EXPORT_SYMBOL_GPL(stmpe_set_bits);
 193
 194 /**
 195  * stmpe_block_read() - read multiple STMPE registers
 196  * @stmpe:      Device to read from
 197  * @reg:        First register
 198  * @length:     Number of registers
 199  * @values:     Buffer to write to
 200  */
 201 int stmpe_block_read(struct stmpe *stmpe, u8 reg, u8 length, u8 *values)
 202 {
 203         int ret;
 204
 205         mutex_lock(&stmpe->lock);
 206         ret = __stmpe_block_read(stmpe, reg, length, values);
 207         mutex_unlock(&stmpe->lock);
 208
 209         return ret;
 210 }
 211 EXPORT_SYMBOL_GPL(stmpe_block_read);
 212
 213 /**
 214  * stmpe_block_write() - write multiple STMPE registers
 215  * @stmpe:      Device to write to
 216  * @reg:        First register
 217  * @length:     Number of registers
 218  * @values:     Values to write
 219  */
 220 int stmpe_block_write(struct stmpe *stmpe, u8 reg, u8 length,
 221                       const u8 *values)
 222 {
 223         int ret;
 224
 225         mutex_lock(&stmpe->lock);
 226         ret = __stmpe_block_write(stmpe, reg, length, values);
 227         mutex_unlock(&stmpe->lock);
 228
 229         return ret;
 230 }
 231 EXPORT_SYMBOL_GPL(stmpe_block_write);
 232
 233 /**
 234  * stmpe_set_altfunc()- set the alternate function for STMPE pins
 235  * @stmpe:      Device to configure
 236  * @pins:       Bitmask of pins to affect
 237  * @block:      block to enable alternate functions for
 238  *
 239  * @pins is assumed to have a bit set for each of the bits whose alternate
 240  * function is to be changed, numbered according to the GPIOXY numbers.
 241  *
 242  * If the GPIO module is not enabled, this function automatically enables it in
 243  * order to perform the change.
 244  */
 245 int stmpe_set_altfunc(struct stmpe *stmpe, u32 pins, enum stmpe_block block)
 246 {
 247         struct stmpe_variant_info *variant = stmpe->variant;
 248         u8 regaddr = stmpe->regs[STMPE_IDX_GPAFR_U_MSB];
 249         int af_bits = variant->af_bits;
 250         int numregs = DIV_ROUND_UP(stmpe->num_gpios * af_bits, 8);
 251         int mask = (1 << af_bits) - 1;
 252         u8 regs[8];
 253         int af, afperreg, ret;
 254
 255         if (!variant->get_altfunc)
 256                 return 0;
 257
 258         afperreg = 8 / af_bits;
 259         mutex_lock(&stmpe->lock);
 260
 261         ret = __stmpe_enable(stmpe, STMPE_BLOCK_GPIO);
 262         if (ret < 0)
 263                 goto out;
 264
 265         ret = __stmpe_block_read(stmpe, regaddr, numregs, regs);
 266         if (ret < 0)
 267                 goto out;
 268
 269         af = variant->get_altfunc(stmpe, block);
 270
 271         while (pins) {
 272                 int pin = __ffs(pins);
 273                 int regoffset = numregs - (pin / afperreg) - 1;
 274                 int pos = (pin % afperreg) * (8 / afperreg);
 275
 276                 regs[regoffset] &= ~(mask << pos);
 277                 regs[regoffset] |= af << pos;
 278
 279                 pins &= ~(1 << pin);
 280         }
 281
 282         ret = __stmpe_block_write(stmpe, regaddr, numregs, regs);
 283
 284 out:
 285         mutex_unlock(&stmpe->lock);
 286         return ret;
 287 }
 288 EXPORT_SYMBOL_GPL(stmpe_set_altfunc);
 289
 290 /*
 291  * GPIO (all variants)
 292  */
 293
 294 static struct resource stmpe_gpio_resources[] = {
 295         /* Start and end filled dynamically */
 296         {
 297                 .flags  = IORESOURCE_IRQ,
 298         },
 299 };
 300
 301 static const struct mfd_cell stmpe_gpio_cell = {
 302         .name           = "stmpe-gpio",
 303         .of_compatible  = "st,stmpe-gpio",
 304         .resources      = stmpe_gpio_resources,
 305         .num_resources  = ARRAY_SIZE(stmpe_gpio_resources),
 306 };
 307
 308 static const struct mfd_cell stmpe_gpio_cell_noirq = {
 309         .name           = "stmpe-gpio",
 310         .of_compatible  = "st,stmpe-gpio",
 311         /* gpio cell resources consist of an irq only so no resources here */
 312 };
 313
 314 /*
 315  * Keypad (1601, 2401, 2403)
 316  */
 317
 318 static struct resource stmpe_keypad_resources[] = {
 319         {
 320                 .name   = "KEYPAD",
 321                 .flags  = IORESOURCE_IRQ,
 322         },
 323         {
 324                 .name   = "KEYPAD_OVER",
 325                 .flags  = IORESOURCE_IRQ,
 326         },
 327 };
 328
 329 static const struct mfd_cell stmpe_keypad_cell = {
 330         .name           = "stmpe-keypad",
 331         .of_compatible  = "st,stmpe-keypad",
 332         .resources      = stmpe_keypad_resources,
 333         .num_resources  = ARRAY_SIZE(stmpe_keypad_resources),
 334 };
 335
 336 /*
 337  * STMPE801
 338  */
 339 static const u8 stmpe801_regs[] = {
 340         [STMPE_IDX_CHIP_ID]     = STMPE801_REG_CHIP_ID,
 341         [STMPE_IDX_ICR_LSB]     = STMPE801_REG_SYS_CTRL,
 342         [STMPE_IDX_GPMR_LSB]    = STMPE801_REG_GPIO_MP_STA,
 343         [STMPE_IDX_GPSR_LSB]    = STMPE801_REG_GPIO_SET_PIN,
 344         [STMPE_IDX_GPCR_LSB]    = STMPE801_REG_GPIO_SET_PIN,
 345         [STMPE_IDX_GPDR_LSB]    = STMPE801_REG_GPIO_DIR,
 346         [STMPE_IDX_IEGPIOR_LSB] = STMPE801_REG_GPIO_INT_EN,
 347         [STMPE_IDX_ISGPIOR_MSB] = STMPE801_REG_GPIO_INT_STA,
 348
 349 };
 350
 351 static struct stmpe_variant_block stmpe801_blocks[] = {
 352         {
 353                 .cell   = &stmpe_gpio_cell,
 354                 .irq    = 0,
 355                 .block  = STMPE_BLOCK_GPIO,
 356         },
 357 };
 358
 359 static struct stmpe_variant_block stmpe801_blocks_noirq[] = {
 360         {
 361                 .cell   = &stmpe_gpio_cell_noirq,
 362                 .block  = STMPE_BLOCK_GPIO,
 363         },
 364 };
 365
 366 static int stmpe801_enable(struct stmpe *stmpe, unsigned int blocks,
 367                            bool enable)
 368 {
 369         if (blocks & STMPE_BLOCK_GPIO)
 370                 return 0;
 371         else
 372                 return -EINVAL;
 373 }
 374
 375 static struct stmpe_variant_info stmpe801 = {
 376         .name           = "stmpe801",
 377         .id_val         = STMPE801_ID,
 378         .id_mask        = 0xffff,
 379         .num_gpios      = 8,
 380         .regs           = stmpe801_regs,
 381         .blocks         = stmpe801_blocks,
 382         .num_blocks     = ARRAY_SIZE(stmpe801_blocks),
 383         .num_irqs       = STMPE801_NR_INTERNAL_IRQS,
 384         .enable         = stmpe801_enable,
 385 };
 386
 387 static struct stmpe_variant_info stmpe801_noirq = {
 388         .name           = "stmpe801",
 389         .id_val         = STMPE801_ID,
 390         .id_mask        = 0xffff,
 391         .num_gpios      = 8,
 392         .regs           = stmpe801_regs,
 393         .blocks         = stmpe801_blocks_noirq,
 394         .num_blocks     = ARRAY_SIZE(stmpe801_blocks_noirq),
 395         .enable         = stmpe801_enable,
 396 };
 397
 398 /*
 399  * Touchscreen (STMPE811 or STMPE610)
 400  */
 401
 402 static struct resource stmpe_ts_resources[] = {
 403         {
 404                 .name   = "TOUCH_DET",
 405                 .flags  = IORESOURCE_IRQ,
 406         },
 407         {
 408                 .name   = "FIFO_TH",
 409                 .flags  = IORESOURCE_IRQ,
 410         },
 411 };
 412
 413 static const struct mfd_cell stmpe_ts_cell = {
 414         .name           = "stmpe-ts",
 415         .of_compatible  = "st,stmpe-ts",
 416         .resources      = stmpe_ts_resources,
 417         .num_resources  = ARRAY_SIZE(stmpe_ts_resources),
 418 };
 419
 420 /*
 421  * STMPE811 or STMPE610
 422  */
 423
 424 static const u8 stmpe811_regs[] = {
 425         [STMPE_IDX_CHIP_ID]     = STMPE811_REG_CHIP_ID,
 426         [STMPE_IDX_ICR_LSB]     = STMPE811_REG_INT_CTRL,
 427         [STMPE_IDX_IER_LSB]     = STMPE811_REG_INT_EN,
 428         [STMPE_IDX_ISR_MSB]     = STMPE811_REG_INT_STA,
 429         [STMPE_IDX_GPMR_LSB]    = STMPE811_REG_GPIO_MP_STA,
 430         [STMPE_IDX_GPSR_LSB]    = STMPE811_REG_GPIO_SET_PIN,
 431         [STMPE_IDX_GPCR_LSB]    = STMPE811_REG_GPIO_CLR_PIN,
 432         [STMPE_IDX_GPDR_LSB]    = STMPE811_REG_GPIO_DIR,
 433         [STMPE_IDX_GPRER_LSB]   = STMPE811_REG_GPIO_RE,
 434         [STMPE_IDX_GPFER_LSB]   = STMPE811_REG_GPIO_FE,
 435         [STMPE_IDX_GPAFR_U_MSB] = STMPE811_REG_GPIO_AF,
 436         [STMPE_IDX_IEGPIOR_LSB] = STMPE811_REG_GPIO_INT_EN,
 437         [STMPE_IDX_ISGPIOR_MSB] = STMPE811_REG_GPIO_INT_STA,
 438         [STMPE_IDX_GPEDR_MSB]   = STMPE811_REG_GPIO_ED,
 439 };
 440
 441 static struct stmpe_variant_block stmpe811_blocks[] = {
 442         {
 443                 .cell   = &stmpe_gpio_cell,
 444                 .irq    = STMPE811_IRQ_GPIOC,
 445                 .block  = STMPE_BLOCK_GPIO,
 446         },
 447         {
 448                 .cell   = &stmpe_ts_cell,
 449                 .irq    = STMPE811_IRQ_TOUCH_DET,
 450                 .block  = STMPE_BLOCK_TOUCHSCREEN,
 451         },
 452 };
 453
 454 static int stmpe811_enable(struct stmpe *stmpe, unsigned int blocks,
 455                            bool enable)
 456 {
 457         unsigned int mask = 0;
 458
 459         if (blocks & STMPE_BLOCK_GPIO)
 460                 mask |= STMPE811_SYS_CTRL2_GPIO_OFF;
 461
 462         if (blocks & STMPE_BLOCK_ADC)
 463                 mask |= STMPE811_SYS_CTRL2_ADC_OFF;
 464
 465         if (blocks & STMPE_BLOCK_TOUCHSCREEN)
 466                 mask |= STMPE811_SYS_CTRL2_TSC_OFF;
 467
 468         return __stmpe_set_bits(stmpe, STMPE811_REG_SYS_CTRL2, mask,
 469                                 enable ? 0 : mask);
 470 }
 471
 472 static int stmpe811_get_altfunc(struct stmpe *stmpe, enum stmpe_block block)
 473 {
 474         /* 0 for touchscreen, 1 for GPIO */
 475         return block != STMPE_BLOCK_TOUCHSCREEN;
 476 }
 477
 478 static struct stmpe_variant_info stmpe811 = {
 479         .name           = "stmpe811",
 480         .id_val         = 0x0811,
 481         .id_mask        = 0xffff,
 482         .num_gpios      = 8,
 483         .af_bits        = 1,
 484         .regs           = stmpe811_regs,
 485         .blocks         = stmpe811_blocks,
 486         .num_blocks     = ARRAY_SIZE(stmpe811_blocks),
 487         .num_irqs       = STMPE811_NR_INTERNAL_IRQS,
 488         .enable         = stmpe811_enable,
 489         .get_altfunc    = stmpe811_get_altfunc,
 490 };
 491
 492 /* Similar to 811, except number of gpios */
 493 static struct stmpe_variant_info stmpe610 = {
 494         .name           = "stmpe610",
 495         .id_val         = 0x0811,
 496         .id_mask        = 0xffff,
 497         .num_gpios      = 6,
 498         .af_bits        = 1,
 499         .regs           = stmpe811_regs,
 500         .blocks         = stmpe811_blocks,
 501         .num_blocks     = ARRAY_SIZE(stmpe811_blocks),
 502         .num_irqs       = STMPE811_NR_INTERNAL_IRQS,
 503         .enable         = stmpe811_enable,
 504         .get_altfunc    = stmpe811_get_altfunc,
 505 };
 506
 507 /*
 508  * STMPE1601
 509  */
 510
 511 static const u8 stmpe1601_regs[] = {
 512         [STMPE_IDX_CHIP_ID]     = STMPE1601_REG_CHIP_ID,
 513         [STMPE_IDX_ICR_LSB]     = STMPE1601_REG_ICR_LSB,
 514         [STMPE_IDX_IER_LSB]     = STMPE1601_REG_IER_LSB,
 515         [STMPE_IDX_ISR_MSB]     = STMPE1601_REG_ISR_MSB,
 516         [STMPE_IDX_GPMR_LSB]    = STMPE1601_REG_GPIO_MP_LSB,
 517         [STMPE_IDX_GPSR_LSB]    = STMPE1601_REG_GPIO_SET_LSB,
 518         [STMPE_IDX_GPCR_LSB]    = STMPE1601_REG_GPIO_CLR_LSB,
 519         [STMPE_IDX_GPDR_LSB]    = STMPE1601_REG_GPIO_SET_DIR_LSB,
 520         [STMPE_IDX_GPRER_LSB]   = STMPE1601_REG_GPIO_RE_LSB,
 521         [STMPE_IDX_GPFER_LSB]   = STMPE1601_REG_GPIO_FE_LSB,
 522         [STMPE_IDX_GPPUR_LSB]   = STMPE1601_REG_GPIO_PU_LSB,
 523         [STMPE_IDX_GPAFR_U_MSB] = STMPE1601_REG_GPIO_AF_U_MSB,
 524         [STMPE_IDX_IEGPIOR_LSB] = STMPE1601_REG_INT_EN_GPIO_MASK_LSB,
 525         [STMPE_IDX_ISGPIOR_MSB] = STMPE1601_REG_INT_STA_GPIO_MSB,
 526         [STMPE_IDX_GPEDR_MSB]   = STMPE1601_REG_GPIO_ED_MSB,
 527 };
 528
 529 static struct stmpe_variant_block stmpe1601_blocks[] = {
 530         {
 531                 .cell   = &stmpe_gpio_cell,
 532                 .irq    = STMPE1601_IRQ_GPIOC,
 533                 .block  = STMPE_BLOCK_GPIO,
 534         },
 535         {
 536                 .cell   = &stmpe_keypad_cell,
 537                 .irq    = STMPE1601_IRQ_KEYPAD,
 538                 .block  = STMPE_BLOCK_KEYPAD,
 539         },
 540 };
 541
 542 /* supported autosleep timeout delay (in msecs) */
 543 static const int stmpe_autosleep_delay[] = {
 544         4, 16, 32, 64, 128, 256, 512, 1024,
 545 };
 546
 547 static int stmpe_round_timeout(int timeout)
 548 {
 549         int i;
 550
 551         for (i = 0; i < ARRAY_SIZE(stmpe_autosleep_delay); i++) {
 552                 if (stmpe_autosleep_delay[i] >= timeout)
 553                         return i;
 554         }
 555
 556         /*
 557          * requests for delays longer than supported should not return the
 558          * longest supported delay
 559          */
 560         return -EINVAL;
 561 }
 562
 563 static int stmpe_autosleep(struct stmpe *stmpe, int autosleep_timeout)
 564 {
 565         int ret;
 566
 567         if (!stmpe->variant->enable_autosleep)
 568                 return -ENOSYS;
 569
 570         mutex_lock(&stmpe->lock);
 571         ret = stmpe->variant->enable_autosleep(stmpe, autosleep_timeout);
 572         mutex_unlock(&stmpe->lock);
 573
 574         return ret;
 575 }
 576
 577 /*
 578  * Both stmpe 1601/2403 support same layout for autosleep
 579  */
 580 static int stmpe1601_autosleep(struct stmpe *stmpe,
 581                 int autosleep_timeout)
 582 {
 583         int ret, timeout;
 584
 585         /* choose the best available timeout */
 586         timeout = stmpe_round_timeout(autosleep_timeout);
 587         if (timeout < 0) {
 588                 dev_err(stmpe->dev, "invalid timeout\n");
 589                 return timeout;
 590         }
 591
 592         ret = __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL2,
 593                         STMPE1601_AUTOSLEEP_TIMEOUT_MASK,
 594                         timeout);
 595         if (ret < 0)
 596                 return ret;
 597
 598         return __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL2,
 599                         STPME1601_AUTOSLEEP_ENABLE,
 600                         STPME1601_AUTOSLEEP_ENABLE);
 601 }
 602
 603 static int stmpe1601_enable(struct stmpe *stmpe, unsigned int blocks,
 604                             bool enable)
 605 {
 606         unsigned int mask = 0;
 607
 608         if (blocks & STMPE_BLOCK_GPIO)
 609                 mask |= STMPE1601_SYS_CTRL_ENABLE_GPIO;
 610         else
 611                 mask &= ~STMPE1601_SYS_CTRL_ENABLE_GPIO;
 612
 613         if (blocks & STMPE_BLOCK_KEYPAD)
 614                 mask |= STMPE1601_SYS_CTRL_ENABLE_KPC;
 615         else
 616                 mask &= ~STMPE1601_SYS_CTRL_ENABLE_KPC;
 617
 618         if (blocks & STMPE_BLOCK_PWM)
 619                 mask |= STMPE1601_SYS_CTRL_ENABLE_SPWM;
 620         else
 621                 mask &= ~STMPE1601_SYS_CTRL_ENABLE_SPWM;
 622
 623         return __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL, mask,
 624                                 enable ? mask : 0);
 625 }
 626
 627 static int stmpe1601_get_altfunc(struct stmpe *stmpe, enum stmpe_block block)
 628 {
 629         switch (block) {
 630         case STMPE_BLOCK_PWM:
 631                 return 2;
 632
 633         case STMPE_BLOCK_KEYPAD:
 634                 return 1;
 635
 636         case STMPE_BLOCK_GPIO:
 637         default:
 638                 return 0;
 639         }
 640 }
 641
 642 static struct stmpe_variant_info stmpe1601 = {
 643         .name           = "stmpe1601",
 644         .id_val         = 0x0210,
 645         .id_mask        = 0xfff0,       /* at least 0x0210 and 0x0212 */
 646         .num_gpios      = 16,
 647         .af_bits        = 2,
 648         .regs           = stmpe1601_regs,
 649         .blocks         = stmpe1601_blocks,
 650         .num_blocks     = ARRAY_SIZE(stmpe1601_blocks),
 651         .num_irqs       = STMPE1601_NR_INTERNAL_IRQS,
 652         .enable         = stmpe1601_enable,
 653         .get_altfunc    = stmpe1601_get_altfunc,
 654         .enable_autosleep       = stmpe1601_autosleep,
 655 };
 656
 657 /*
 658  * STMPE1801
 659  */
 660 static const u8 stmpe1801_regs[] = {
 661         [STMPE_IDX_CHIP_ID]     = STMPE1801_REG_CHIP_ID,
 662         [STMPE_IDX_ICR_LSB]     = STMPE1801_REG_INT_CTRL_LOW,
 663         [STMPE_IDX_IER_LSB]     = STMPE1801_REG_INT_EN_MASK_LOW,
 664         [STMPE_IDX_ISR_LSB]     = STMPE1801_REG_INT_STA_LOW,
 665         [STMPE_IDX_GPMR_LSB]    = STMPE1801_REG_GPIO_MP_LOW,
 666         [STMPE_IDX_GPSR_LSB]    = STMPE1801_REG_GPIO_SET_LOW,
 667         [STMPE_IDX_GPCR_LSB]    = STMPE1801_REG_GPIO_CLR_LOW,
 668         [STMPE_IDX_GPDR_LSB]    = STMPE1801_REG_GPIO_SET_DIR_LOW,
 669         [STMPE_IDX_GPRER_LSB]   = STMPE1801_REG_GPIO_RE_LOW,
 670         [STMPE_IDX_GPFER_LSB]   = STMPE1801_REG_GPIO_FE_LOW,
 671         [STMPE_IDX_GPPUR_LSB]   = STMPE1801_REG_GPIO_PULL_UP_LOW,
 672         [STMPE_IDX_IEGPIOR_LSB] = STMPE1801_REG_INT_EN_GPIO_MASK_LOW,
 673         [STMPE_IDX_ISGPIOR_LSB] = STMPE1801_REG_INT_STA_GPIO_LOW,
 674 };
 675
 676 static struct stmpe_variant_block stmpe1801_blocks[] = {
 677         {
 678                 .cell   = &stmpe_gpio_cell,
 679                 .irq    = STMPE1801_IRQ_GPIOC,
 680                 .block  = STMPE_BLOCK_GPIO,
 681         },
 682         {
 683                 .cell   = &stmpe_keypad_cell,
 684                 .irq    = STMPE1801_IRQ_KEYPAD,
 685                 .block  = STMPE_BLOCK_KEYPAD,
 686         },
 687 };
 688
 689 static int stmpe1801_enable(struct stmpe *stmpe, unsigned int blocks,
 690                             bool enable)
 691 {
 692         unsigned int mask = 0;
 693         if (blocks & STMPE_BLOCK_GPIO)
 694                 mask |= STMPE1801_MSK_INT_EN_GPIO;
 695
 696         if (blocks & STMPE_BLOCK_KEYPAD)
 697                 mask |= STMPE1801_MSK_INT_EN_KPC;
 698
 699         return __stmpe_set_bits(stmpe, STMPE1801_REG_INT_EN_MASK_LOW, mask,
 700                                 enable ? mask : 0);
 701 }
 702
 703 static int stmpe1801_reset(struct stmpe *stmpe)
 704 {
 705         unsigned long timeout;
 706         int ret = 0;
 707
 708         ret = __stmpe_set_bits(stmpe, STMPE1801_REG_SYS_CTRL,
 709                 STMPE1801_MSK_SYS_CTRL_RESET, STMPE1801_MSK_SYS_CTRL_RESET);
 710         if (ret < 0)
 711                 return ret;
 712
 713         timeout = jiffies + msecs_to_jiffies(100);
 714         while (time_before(jiffies, timeout)) {
 715                 ret = __stmpe_reg_read(stmpe, STMPE1801_REG_SYS_CTRL);
 716                 if (ret < 0)
 717                         return ret;
 718                 if (!(ret & STMPE1801_MSK_SYS_CTRL_RESET))
 719                         return 0;
 720                 usleep_range(100, 200);
 721         }
 722         return -EIO;
 723 }
 724
 725 static struct stmpe_variant_info stmpe1801 = {
 726         .name           = "stmpe1801",
 727         .id_val         = STMPE1801_ID,
 728         .id_mask        = 0xfff0,
 729         .num_gpios      = 18,
 730         .af_bits        = 0,
 731         .regs           = stmpe1801_regs,
 732         .blocks         = stmpe1801_blocks,
 733         .num_blocks     = ARRAY_SIZE(stmpe1801_blocks),
 734         .num_irqs       = STMPE1801_NR_INTERNAL_IRQS,
 735         .enable         = stmpe1801_enable,
 736         /* stmpe1801 do not have any gpio alternate function */
 737         .get_altfunc    = NULL,
 738 };
 739
 740 /*
 741  * STMPE24XX
 742  */
 743
 744 static const u8 stmpe24xx_regs[] = {
 745         [STMPE_IDX_CHIP_ID]     = STMPE24XX_REG_CHIP_ID,
 746         [STMPE_IDX_ICR_LSB]     = STMPE24XX_REG_ICR_LSB,
 747         [STMPE_IDX_IER_LSB]     = STMPE24XX_REG_IER_LSB,
 748         [STMPE_IDX_ISR_MSB]     = STMPE24XX_REG_ISR_MSB,
 749         [STMPE_IDX_GPMR_LSB]    = STMPE24XX_REG_GPMR_LSB,
 750         [STMPE_IDX_GPSR_LSB]    = STMPE24XX_REG_GPSR_LSB,
 751         [STMPE_IDX_GPCR_LSB]    = STMPE24XX_REG_GPCR_LSB,
 752         [STMPE_IDX_GPDR_LSB]    = STMPE24XX_REG_GPDR_LSB,
 753         [STMPE_IDX_GPRER_LSB]   = STMPE24XX_REG_GPRER_LSB,
 754         [STMPE_IDX_GPFER_LSB]   = STMPE24XX_REG_GPFER_LSB,
 755         [STMPE_IDX_GPPUR_LSB]   = STMPE24XX_REG_GPPUR_LSB,
 756         [STMPE_IDX_GPPDR_LSB]   = STMPE24XX_REG_GPPDR_LSB,
 757         [STMPE_IDX_GPAFR_U_MSB] = STMPE24XX_REG_GPAFR_U_MSB,
 758         [STMPE_IDX_IEGPIOR_LSB] = STMPE24XX_REG_IEGPIOR_LSB,
 759         [STMPE_IDX_ISGPIOR_MSB] = STMPE24XX_REG_ISGPIOR_MSB,
 760         [STMPE_IDX_GPEDR_MSB]   = STMPE24XX_REG_GPEDR_MSB,
 761 };
 762
 763 static struct stmpe_variant_block stmpe24xx_blocks[] = {
 764         {
 765                 .cell   = &stmpe_gpio_cell,
 766                 .irq    = STMPE24XX_IRQ_GPIOC,
 767                 .block  = STMPE_BLOCK_GPIO,
 768         },
 769         {
 770                 .cell   = &stmpe_keypad_cell,
 771                 .irq    = STMPE24XX_IRQ_KEYPAD,
 772                 .block  = STMPE_BLOCK_KEYPAD,
 773         },
 774 };
 775
 776 static int stmpe24xx_enable(struct stmpe *stmpe, unsigned int blocks,
 777                             bool enable)
 778 {
 779         unsigned int mask = 0;
 780
 781         if (blocks & STMPE_BLOCK_GPIO)
 782                 mask |= STMPE24XX_SYS_CTRL_ENABLE_GPIO;
 783
 784         if (blocks & STMPE_BLOCK_KEYPAD)
 785                 mask |= STMPE24XX_SYS_CTRL_ENABLE_KPC;
 786
 787         return __stmpe_set_bits(stmpe, STMPE24XX_REG_SYS_CTRL, mask,
 788                                 enable ? mask : 0);
 789 }
 790
 791 static int stmpe24xx_get_altfunc(struct stmpe *stmpe, enum stmpe_block block)
 792 {
 793         switch (block) {
 794         case STMPE_BLOCK_ROTATOR:
 795                 return 2;
 796
 797         case STMPE_BLOCK_KEYPAD:
 798                 return 1;
 799
 800         case STMPE_BLOCK_GPIO:
 801         default:
 802                 return 0;
 803         }
 804 }
 805
 806 static struct stmpe_variant_info stmpe2401 = {
 807         .name           = "stmpe2401",
 808         .id_val         = 0x0101,
 809         .id_mask        = 0xffff,
 810         .num_gpios      = 24,
 811         .af_bits        = 2,
 812         .regs           = stmpe24xx_regs,
 813         .blocks         = stmpe24xx_blocks,
 814         .num_blocks     = ARRAY_SIZE(stmpe24xx_blocks),
 815         .num_irqs       = STMPE24XX_NR_INTERNAL_IRQS,
 816         .enable         = stmpe24xx_enable,
 817         .get_altfunc    = stmpe24xx_get_altfunc,
 818 };
 819
 820 static struct stmpe_variant_info stmpe2403 = {
 821         .name           = "stmpe2403",
 822         .id_val         = 0x0120,
 823         .id_mask        = 0xffff,
 824         .num_gpios      = 24,
 825         .af_bits        = 2,
 826         .regs           = stmpe24xx_regs,
 827         .blocks         = stmpe24xx_blocks,
 828         .num_blocks     = ARRAY_SIZE(stmpe24xx_blocks),
 829         .num_irqs       = STMPE24XX_NR_INTERNAL_IRQS,
 830         .enable         = stmpe24xx_enable,
 831         .get_altfunc    = stmpe24xx_get_altfunc,
 832         .enable_autosleep       = stmpe1601_autosleep, /* same as stmpe1601 */
 833 };
 834
 835 static struct stmpe_variant_info *stmpe_variant_info[STMPE_NBR_PARTS] = {
 836         [STMPE610]      = &stmpe610,
 837         [STMPE801]      = &stmpe801,
 838         [STMPE811]      = &stmpe811,
 839         [STMPE1601]     = &stmpe1601,
 840         [STMPE1801]     = &stmpe1801,
 841         [STMPE2401]     = &stmpe2401,
 842         [STMPE2403]     = &stmpe2403,
 843 };
 844
 845 /*
 846  * These devices can be connected in a 'no-irq' configuration - the irq pin
 847  * is not used and the device cannot interrupt the CPU. Here we only list
 848  * devices which support this configuration - the driver will fail probing
 849  * for any devices not listed here which are configured in this way.
 850  */
 851 static struct stmpe_variant_info *stmpe_noirq_variant_info[STMPE_NBR_PARTS] = {
 852         [STMPE801]      = &stmpe801_noirq,
 853 };
 854
 855 static irqreturn_t stmpe_irq(int irq, void *data)
 856 {
 857         struct stmpe *stmpe = data;
 858         struct stmpe_variant_info *variant = stmpe->variant;
 859         int num = DIV_ROUND_UP(variant->num_irqs, 8);
 860         u8 israddr;
 861         u8 isr[3];
 862         int ret;
 863         int i;
 864
 865         if (variant->id_val == STMPE801_ID) {
 866                 int base = irq_create_mapping(stmpe->domain, 0);
 867
 868                 handle_nested_irq(base);
 869                 return IRQ_HANDLED;
 870         }
 871
 872         if (variant->id_val == STMPE1801_ID)
 873                 israddr = stmpe->regs[STMPE_IDX_ISR_LSB];
 874         else
 875                 israddr = stmpe->regs[STMPE_IDX_ISR_MSB];
 876
 877         ret = stmpe_block_read(stmpe, israddr, num, isr);
 878         if (ret < 0)
 879                 return IRQ_NONE;
 880
 881         for (i = 0; i < num; i++) {
 882                 int bank = num - i - 1;
 883                 u8 status = isr[i];
 884                 u8 clear;
 885
 886                 status &= stmpe->ier[bank];
 887                 if (!status)
 888                         continue;
 889
 890                 clear = status;
 891                 while (status) {
 892                         int bit = __ffs(status);
 893                         int line = bank * 8 + bit;
 894                         int nestedirq = irq_create_mapping(stmpe->domain, line);
 895
 896                         handle_nested_irq(nestedirq);
 897                         status &= ~(1 << bit);
 898                 }
 899
 900                 stmpe_reg_write(stmpe, israddr + i, clear);
 901         }
 902
 903         return IRQ_HANDLED;
 904 }
 905
 906 static void stmpe_irq_lock(struct irq_data *data)
 907 {
 908         struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
 909
 910         mutex_lock(&stmpe->irq_lock);
 911 }
 912
 913 static void stmpe_irq_sync_unlock(struct irq_data *data)
 914 {
 915         struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
 916         struct stmpe_variant_info *variant = stmpe->variant;
 917         int num = DIV_ROUND_UP(variant->num_irqs, 8);
 918         int i;
 919
 920         for (i = 0; i < num; i++) {
 921                 u8 new = stmpe->ier[i];
 922                 u8 old = stmpe->oldier[i];
 923
 924                 if (new == old)
 925                         continue;
 926
 927                 stmpe->oldier[i] = new;
 928                 stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_IER_LSB] - i, new);
 929         }
 930
 931         mutex_unlock(&stmpe->irq_lock);
 932 }
 933
 934 static void stmpe_irq_mask(struct irq_data *data)
 935 {
 936         struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
 937         int offset = data->hwirq;
 938         int regoffset = offset / 8;
 939         int mask = 1 << (offset % 8);
 940
 941         stmpe->ier[regoffset] &= ~mask;
 942 }
 943
 944 static void stmpe_irq_unmask(struct irq_data *data)
 945 {
 946         struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
 947         int offset = data->hwirq;
 948         int regoffset = offset / 8;
 949         int mask = 1 << (offset % 8);
 950
 951         stmpe->ier[regoffset] |= mask;
 952 }
 953
 954 static struct irq_chip stmpe_irq_chip = {
 955         .name                   = "stmpe",
 956         .irq_bus_lock           = stmpe_irq_lock,
 957         .irq_bus_sync_unlock    = stmpe_irq_sync_unlock,
 958         .irq_mask               = stmpe_irq_mask,
 959         .irq_unmask             = stmpe_irq_unmask,
 960 };
 961
 962 static int stmpe_irq_map(struct irq_domain *d, unsigned int virq,
 963                                 irq_hw_number_t hwirq)
 964 {
 965         struct stmpe *stmpe = d->host_data;
 966         struct irq_chip *chip = NULL;
 967
 968         if (stmpe->variant->id_val != STMPE801_ID)
 969                 chip = &stmpe_irq_chip;
 970
 971         irq_set_chip_data(virq, stmpe);
 972         irq_set_chip_and_handler(virq, chip, handle_edge_irq);
 973         irq_set_nested_thread(virq, 1);
 974         irq_set_noprobe(virq);
 975
 976         return 0;
 977 }
 978
 979 static void stmpe_irq_unmap(struct irq_domain *d, unsigned int virq)
 980 {
 981                 irq_set_chip_and_handler(virq, NULL, NULL);
 982                 irq_set_chip_data(virq, NULL);
 983 }
 984
 985 static const struct irq_domain_ops stmpe_irq_ops = {
 986         .map    = stmpe_irq_map,
 987         .unmap  = stmpe_irq_unmap,
 988         .xlate  = irq_domain_xlate_twocell,
 989 };
 990
 991 static int stmpe_irq_init(struct stmpe *stmpe, struct device_node *np)
 992 {
 993         int base = 0;
 994         int num_irqs = stmpe->variant->num_irqs;
 995
 996         stmpe->domain = irq_domain_add_simple(np, num_irqs, base,
 997                                               &stmpe_irq_ops, stmpe);
 998         if (!stmpe->domain) {
 999                 dev_err(stmpe->dev, "Failed to create irqdomain\n");
1000                 return -ENOSYS;
1001         }
1002
1003         return 0;
1004 }
1005
1006 static int stmpe_chip_init(struct stmpe *stmpe)
1007 {
1008         unsigned int irq_trigger = stmpe->pdata->irq_trigger;
1009         int autosleep_timeout = stmpe->pdata->autosleep_timeout;
1010         struct stmpe_variant_info *variant = stmpe->variant;
1011         u8 icr = 0;
1012         unsigned int id;
1013         u8 data[2];
1014         int ret;
1015
1016         ret = stmpe_block_read(stmpe, stmpe->regs[STMPE_IDX_CHIP_ID],
1017                                ARRAY_SIZE(data), data);
1018         if (ret < 0)
1019                 return ret;
1020
1021         id = (data[0] << 8) | data[1];
1022         if ((id & variant->id_mask) != variant->id_val) {
1023                 dev_err(stmpe->dev, "unknown chip id: %#x\n", id);
1024                 return -EINVAL;
1025         }
1026
1027         dev_info(stmpe->dev, "%s detected, chip id: %#x\n", variant->name, id);
1028
1029         /* Disable all modules -- subdrivers should enable what they need. */
1030         ret = stmpe_disable(stmpe, ~0);
1031         if (ret)
1032                 return ret;
1033
1034         if (id == STMPE1801_ID) {
1035                 ret =  stmpe1801_reset(stmpe);
1036                 if (ret < 0)
1037                         return ret;
1038         }
1039
1040         if (stmpe->irq >= 0) {
1041                 if (id == STMPE801_ID)
1042                         icr = STMPE801_REG_SYS_CTRL_INT_EN;
1043                 else
1044                         icr = STMPE_ICR_LSB_GIM;
1045
1046                 /* STMPE801 doesn't support Edge interrupts */
1047                 if (id != STMPE801_ID) {
1048                         if (irq_trigger == IRQF_TRIGGER_FALLING ||
1049                                         irq_trigger == IRQF_TRIGGER_RISING)
1050                                 icr |= STMPE_ICR_LSB_EDGE;
1051                 }
1052
1053                 if (irq_trigger == IRQF_TRIGGER_RISING ||
1054                                 irq_trigger == IRQF_TRIGGER_HIGH) {
1055                         if (id == STMPE801_ID)
1056                                 icr |= STMPE801_REG_SYS_CTRL_INT_HI;
1057                         else
1058                                 icr |= STMPE_ICR_LSB_HIGH;
1059                 }
1060         }
1061
1062         if (stmpe->pdata->autosleep) {
1063                 ret = stmpe_autosleep(stmpe, autosleep_timeout);
1064                 if (ret)
1065                         return ret;
1066         }
1067
1068         return stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_ICR_LSB], icr);
1069 }
1070
1071 static int stmpe_add_device(struct stmpe *stmpe, const struct mfd_cell *cell)
1072 {
1073         return mfd_add_devices(stmpe->dev, stmpe->pdata->id, cell, 1,
1074                                NULL, 0, stmpe->domain);
1075 }
1076
1077 static int stmpe_devices_init(struct stmpe *stmpe)
1078 {
1079         struct stmpe_variant_info *variant = stmpe->variant;
1080         unsigned int platform_blocks = stmpe->pdata->blocks;
1081         int ret = -EINVAL;
1082         int i, j;
1083
1084         for (i = 0; i < variant->num_blocks; i++) {
1085                 struct stmpe_variant_block *block = &variant->blocks[i];
1086
1087                 if (!(platform_blocks & block->block))
1088                         continue;
1089
1090                 for (j = 0; j < block->cell->num_resources; j++) {
1091                         struct resource *res =
1092                                 (struct resource *) &block->cell->resources[j];
1093
1094                         /* Dynamically fill in a variant's IRQ. */
1095                         if (res->flags & IORESOURCE_IRQ)
1096                                 res->start = res->end = block->irq + j;
1097                 }
1098
1099                 platform_blocks &= ~block->block;
1100                 ret = stmpe_add_device(stmpe, block->cell);
1101                 if (ret)
1102                         return ret;
1103         }
1104
1105         if (platform_blocks)
1106                 dev_warn(stmpe->dev,
1107                          "platform wants blocks (%#x) not present on variant",
1108                          platform_blocks);
1109
1110         return ret;
1111 }
1112
1113 static void stmpe_of_probe(struct stmpe_platform_data *pdata,
1114                            struct device_node *np)
1115 {
1116         struct device_node *child;
1117
1118         pdata->id = of_alias_get_id(np, "stmpe-i2c");
1119         if (pdata->id < 0)
1120                 pdata->id = -1;
1121
1122         pdata->irq_gpio = of_get_named_gpio_flags(np, "irq-gpio", 0,
1123                                 &pdata->irq_trigger);
1124         if (gpio_is_valid(pdata->irq_gpio))
1125                 pdata->irq_over_gpio = 1;
1126         else
1127                 pdata->irq_trigger = IRQF_TRIGGER_NONE;
1128
1129         of_property_read_u32(np, "st,autosleep-timeout",
1130                         &pdata->autosleep_timeout);
1131
1132         pdata->autosleep = (pdata->autosleep_timeout) ? true : false;
1133
1134         for_each_child_of_node(np, child) {
1135                 if (!strcmp(child->name, "stmpe_gpio")) {
1136                         pdata->blocks |= STMPE_BLOCK_GPIO;
1137                 } else if (!strcmp(child->name, "stmpe_keypad")) {
1138                         pdata->blocks |= STMPE_BLOCK_KEYPAD;
1139                 } else if (!strcmp(child->name, "stmpe_touchscreen")) {
1140                         pdata->blocks |= STMPE_BLOCK_TOUCHSCREEN;
1141                 } else if (!strcmp(child->name, "stmpe_adc")) {
1142                         pdata->blocks |= STMPE_BLOCK_ADC;
1143                 } else if (!strcmp(child->name, "stmpe_pwm")) {
1144                         pdata->blocks |= STMPE_BLOCK_PWM;
1145                 } else if (!strcmp(child->name, "stmpe_rotator")) {
1146                         pdata->blocks |= STMPE_BLOCK_ROTATOR;
1147                 }
1148         }
1149 }
1150
1151 /* Called from client specific probe routines */
1152 int stmpe_probe(struct stmpe_client_info *ci, enum stmpe_partnum partnum)
1153 {
1154         struct stmpe_platform_data *pdata = dev_get_platdata(ci->dev);
1155         struct device_node *np = ci->dev->of_node;
1156         struct stmpe *stmpe;
1157         int ret;
1158
1159         if (!pdata) {
1160                 if (!np)
1161                         return -EINVAL;
1162
1163                 pdata = devm_kzalloc(ci->dev, sizeof(*pdata), GFP_KERNEL);
1164                 if (!pdata)
1165                         return -ENOMEM;
1166
1167                 stmpe_of_probe(pdata, np);
1168
1169                 if (of_find_property(np, "interrupts", NULL) == NULL)
1170                         ci->irq = -1;
1171         }
1172
1173         stmpe = devm_kzalloc(ci->dev, sizeof(struct stmpe), GFP_KERNEL);
1174         if (!stmpe)
1175                 return -ENOMEM;
1176
1177         mutex_init(&stmpe->irq_lock);
1178         mutex_init(&stmpe->lock);
1179
1180         stmpe->dev = ci->dev;
1181         stmpe->client = ci->client;
1182         stmpe->pdata = pdata;
1183         stmpe->ci = ci;
1184         stmpe->partnum = partnum;
1185         stmpe->variant = stmpe_variant_info[partnum];
1186         stmpe->regs = stmpe->variant->regs;
1187         stmpe->num_gpios = stmpe->variant->num_gpios;
1188         stmpe->vcc = devm_regulator_get_optional(ci->dev, "vcc");
1189         if (!IS_ERR(stmpe->vcc)) {
1190                 ret = regulator_enable(stmpe->vcc);
1191                 if (ret)
1192                         dev_warn(ci->dev, "failed to enable VCC supply\n");
1193         }
1194         stmpe->vio = devm_regulator_get_optional(ci->dev, "vio");
1195         if (!IS_ERR(stmpe->vio)) {
1196                 ret = regulator_enable(stmpe->vio);
1197                 if (ret)
1198                         dev_warn(ci->dev, "failed to enable VIO supply\n");
1199         }
1200         dev_set_drvdata(stmpe->dev, stmpe);
1201
1202         if (ci->init)
1203                 ci->init(stmpe);
1204
1205         if (pdata->irq_over_gpio) {
1206                 ret = devm_gpio_request_one(ci->dev, pdata->irq_gpio,
1207                                 GPIOF_DIR_IN, "stmpe");
1208                 if (ret) {
1209                         dev_err(stmpe->dev, "failed to request IRQ GPIO: %d\n",
1210                                         ret);
1211                         return ret;
1212                 }
1213
1214                 stmpe->irq = gpio_to_irq(pdata->irq_gpio);
1215         } else {
1216                 stmpe->irq = ci->irq;
1217         }
1218
1219         if (stmpe->irq < 0) {
1220                 /* use alternate variant info for no-irq mode, if supported */
1221                 dev_info(stmpe->dev,
1222                         "%s configured in no-irq mode by platform data\n",
1223                         stmpe->variant->name);
1224                 if (!stmpe_noirq_variant_info[stmpe->partnum]) {
1225                         dev_err(stmpe->dev,
1226                                 "%s does not support no-irq mode!\n",
1227                                 stmpe->variant->name);
1228                         return -ENODEV;
1229                 }
1230                 stmpe->variant = stmpe_noirq_variant_info[stmpe->partnum];
1231         } else if (pdata->irq_trigger == IRQF_TRIGGER_NONE) {
1232                 pdata->irq_trigger = irq_get_trigger_type(stmpe->irq);
1233         }
1234
1235         ret = stmpe_chip_init(stmpe);
1236         if (ret)
1237                 return ret;
1238
1239         if (stmpe->irq >= 0) {
1240                 ret = stmpe_irq_init(stmpe, np);
1241                 if (ret)
1242                         return ret;
1243
1244                 ret = devm_request_threaded_irq(ci->dev, stmpe->irq, NULL,
1245                                 stmpe_irq, pdata->irq_trigger | IRQF_ONESHOT,
1246                                 "stmpe", stmpe);
1247                 if (ret) {
1248                         dev_err(stmpe->dev, "failed to request IRQ: %d\n",
1249                                         ret);
1250                         return ret;
1251                 }
1252         }
1253
1254         ret = stmpe_devices_init(stmpe);
1255         if (!ret)
1256                 return 0;
1257
1258         dev_err(stmpe->dev, "failed to add children\n");
1259         mfd_remove_devices(stmpe->dev);
1260
1261         return ret;
1262 }
1263
1264 int stmpe_remove(struct stmpe *stmpe)
1265 {
1266         if (!IS_ERR(stmpe->vio))
1267                 regulator_disable(stmpe->vio);
1268         if (!IS_ERR(stmpe->vcc))
1269                 regulator_disable(stmpe->vcc);
1270
1271         mfd_remove_devices(stmpe->dev);
1272
1273         return 0;
1274 }
1275
1276 #ifdef CONFIG_PM
1277 static int stmpe_suspend(struct device *dev)
1278 {
1279         struct stmpe *stmpe = dev_get_drvdata(dev);
1280
1281         if (stmpe->irq >= 0 && device_may_wakeup(dev))
1282                 enable_irq_wake(stmpe->irq);
1283
1284         return 0;
1285 }
1286
1287 static int stmpe_resume(struct device *dev)
1288 {
1289         struct stmpe *stmpe = dev_get_drvdata(dev);
1290
1291         if (stmpe->irq >= 0 && device_may_wakeup(dev))
1292                 disable_irq_wake(stmpe->irq);
1293
1294         return 0;
1295 }
1296
1297 const struct dev_pm_ops stmpe_dev_pm_ops = {
1298         .suspend        = stmpe_suspend,
1299         .resume         = stmpe_resume,
1300 };
1301 #endif