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         .of_compatible  = "st,stmpe-keypad",
 328         .resources      = stmpe_keypad_resources,
 329         .num_resources  = ARRAY_SIZE(stmpe_keypad_resources),
 330 };
 331
 332 /*
 333  * STMPE801
 334  */
 335 static const u8 stmpe801_regs[] = {
 336         [STMPE_IDX_CHIP_ID]     = STMPE801_REG_CHIP_ID,
 337         [STMPE_IDX_ICR_LSB]     = STMPE801_REG_SYS_CTRL,
 338         [STMPE_IDX_GPMR_LSB]    = STMPE801_REG_GPIO_MP_STA,
 339         [STMPE_IDX_GPSR_LSB]    = STMPE801_REG_GPIO_SET_PIN,
 340         [STMPE_IDX_GPCR_LSB]    = STMPE801_REG_GPIO_SET_PIN,
 341         [STMPE_IDX_GPDR_LSB]    = STMPE801_REG_GPIO_DIR,
 342         [STMPE_IDX_IEGPIOR_LSB] = STMPE801_REG_GPIO_INT_EN,
 343         [STMPE_IDX_ISGPIOR_MSB] = STMPE801_REG_GPIO_INT_STA,
 344
 345 };
 346
 347 static struct stmpe_variant_block stmpe801_blocks[] = {
 348         {
 349                 .cell   = &stmpe_gpio_cell,
 350                 .irq    = 0,
 351                 .block  = STMPE_BLOCK_GPIO,
 352         },
 353 };
 354
 355 static struct stmpe_variant_block stmpe801_blocks_noirq[] = {
 356         {
 357                 .cell   = &stmpe_gpio_cell_noirq,
 358                 .block  = STMPE_BLOCK_GPIO,
 359         },
 360 };
 361
 362 static int stmpe801_enable(struct stmpe *stmpe, unsigned int blocks,
 363                            bool enable)
 364 {
 365         if (blocks & STMPE_BLOCK_GPIO)
 366                 return 0;
 367         else
 368                 return -EINVAL;
 369 }
 370
 371 static struct stmpe_variant_info stmpe801 = {
 372         .name           = "stmpe801",
 373         .id_val         = STMPE801_ID,
 374         .id_mask        = 0xffff,
 375         .num_gpios      = 8,
 376         .regs           = stmpe801_regs,
 377         .blocks         = stmpe801_blocks,
 378         .num_blocks     = ARRAY_SIZE(stmpe801_blocks),
 379         .num_irqs       = STMPE801_NR_INTERNAL_IRQS,
 380         .enable         = stmpe801_enable,
 381 };
 382
 383 static struct stmpe_variant_info stmpe801_noirq = {
 384         .name           = "stmpe801",
 385         .id_val         = STMPE801_ID,
 386         .id_mask        = 0xffff,
 387         .num_gpios      = 8,
 388         .regs           = stmpe801_regs,
 389         .blocks         = stmpe801_blocks_noirq,
 390         .num_blocks     = ARRAY_SIZE(stmpe801_blocks_noirq),
 391         .enable         = stmpe801_enable,
 392 };
 393
 394 /*
 395  * Touchscreen (STMPE811 or STMPE610)
 396  */
 397
 398 static struct resource stmpe_ts_resources[] = {
 399         {
 400                 .name   = "TOUCH_DET",
 401                 .start  = 0,
 402                 .end    = 0,
 403                 .flags  = IORESOURCE_IRQ,
 404         },
 405         {
 406                 .name   = "FIFO_TH",
 407                 .start  = 1,
 408                 .end    = 1,
 409                 .flags  = IORESOURCE_IRQ,
 410         },
 411 };
 412
 413 static 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_GPAFR_U_MSB] = STMPE1601_REG_GPIO_AF_U_MSB,
 523         [STMPE_IDX_IEGPIOR_LSB] = STMPE1601_REG_INT_EN_GPIO_MASK_LSB,
 524         [STMPE_IDX_ISGPIOR_MSB] = STMPE1601_REG_INT_STA_GPIO_MSB,
 525         [STMPE_IDX_GPEDR_MSB]   = STMPE1601_REG_GPIO_ED_MSB,
 526 };
 527
 528 static struct stmpe_variant_block stmpe1601_blocks[] = {
 529         {
 530                 .cell   = &stmpe_gpio_cell,
 531                 .irq    = STMPE24XX_IRQ_GPIOC,
 532                 .block  = STMPE_BLOCK_GPIO,
 533         },
 534         {
 535                 .cell   = &stmpe_keypad_cell,
 536                 .irq    = STMPE24XX_IRQ_KEYPAD,
 537                 .block  = STMPE_BLOCK_KEYPAD,
 538         },
 539 };
 540
 541 /* supported autosleep timeout delay (in msecs) */
 542 static const int stmpe_autosleep_delay[] = {
 543         4, 16, 32, 64, 128, 256, 512, 1024,
 544 };
 545
 546 static int stmpe_round_timeout(int timeout)
 547 {
 548         int i;
 549
 550         for (i = 0; i < ARRAY_SIZE(stmpe_autosleep_delay); i++) {
 551                 if (stmpe_autosleep_delay[i] >= timeout)
 552                         return i;
 553         }
 554
 555         /*
 556          * requests for delays longer than supported should not return the
 557          * longest supported delay
 558          */
 559         return -EINVAL;
 560 }
 561
 562 static int stmpe_autosleep(struct stmpe *stmpe, int autosleep_timeout)
 563 {
 564         int ret;
 565
 566         if (!stmpe->variant->enable_autosleep)
 567                 return -ENOSYS;
 568
 569         mutex_lock(&stmpe->lock);
 570         ret = stmpe->variant->enable_autosleep(stmpe, autosleep_timeout);
 571         mutex_unlock(&stmpe->lock);
 572
 573         return ret;
 574 }
 575
 576 /*
 577  * Both stmpe 1601/2403 support same layout for autosleep
 578  */
 579 static int stmpe1601_autosleep(struct stmpe *stmpe,
 580                 int autosleep_timeout)
 581 {
 582         int ret, timeout;
 583
 584         /* choose the best available timeout */
 585         timeout = stmpe_round_timeout(autosleep_timeout);
 586         if (timeout < 0) {
 587                 dev_err(stmpe->dev, "invalid timeout\n");
 588                 return timeout;
 589         }
 590
 591         ret = __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL2,
 592                         STMPE1601_AUTOSLEEP_TIMEOUT_MASK,
 593                         timeout);
 594         if (ret < 0)
 595                 return ret;
 596
 597         return __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL2,
 598                         STPME1601_AUTOSLEEP_ENABLE,
 599                         STPME1601_AUTOSLEEP_ENABLE);
 600 }
 601
 602 static int stmpe1601_enable(struct stmpe *stmpe, unsigned int blocks,
 603                             bool enable)
 604 {
 605         unsigned int mask = 0;
 606
 607         if (blocks & STMPE_BLOCK_GPIO)
 608                 mask |= STMPE1601_SYS_CTRL_ENABLE_GPIO;
 609
 610         if (blocks & STMPE_BLOCK_KEYPAD)
 611                 mask |= STMPE1601_SYS_CTRL_ENABLE_KPC;
 612
 613         return __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL, mask,
 614                                 enable ? mask : 0);
 615 }
 616
 617 static int stmpe1601_get_altfunc(struct stmpe *stmpe, enum stmpe_block block)
 618 {
 619         switch (block) {
 620         case STMPE_BLOCK_PWM:
 621                 return 2;
 622
 623         case STMPE_BLOCK_KEYPAD:
 624                 return 1;
 625
 626         case STMPE_BLOCK_GPIO:
 627         default:
 628                 return 0;
 629         }
 630 }
 631
 632 static struct stmpe_variant_info stmpe1601 = {
 633         .name           = "stmpe1601",
 634         .id_val         = 0x0210,
 635         .id_mask        = 0xfff0,       /* at least 0x0210 and 0x0212 */
 636         .num_gpios      = 16,
 637         .af_bits        = 2,
 638         .regs           = stmpe1601_regs,
 639         .blocks         = stmpe1601_blocks,
 640         .num_blocks     = ARRAY_SIZE(stmpe1601_blocks),
 641         .num_irqs       = STMPE1601_NR_INTERNAL_IRQS,
 642         .enable         = stmpe1601_enable,
 643         .get_altfunc    = stmpe1601_get_altfunc,
 644         .enable_autosleep       = stmpe1601_autosleep,
 645 };
 646
 647 /*
 648  * STMPE24XX
 649  */
 650
 651 static const u8 stmpe24xx_regs[] = {
 652         [STMPE_IDX_CHIP_ID]     = STMPE24XX_REG_CHIP_ID,
 653         [STMPE_IDX_ICR_LSB]     = STMPE24XX_REG_ICR_LSB,
 654         [STMPE_IDX_IER_LSB]     = STMPE24XX_REG_IER_LSB,
 655         [STMPE_IDX_ISR_MSB]     = STMPE24XX_REG_ISR_MSB,
 656         [STMPE_IDX_GPMR_LSB]    = STMPE24XX_REG_GPMR_LSB,
 657         [STMPE_IDX_GPSR_LSB]    = STMPE24XX_REG_GPSR_LSB,
 658         [STMPE_IDX_GPCR_LSB]    = STMPE24XX_REG_GPCR_LSB,
 659         [STMPE_IDX_GPDR_LSB]    = STMPE24XX_REG_GPDR_LSB,
 660         [STMPE_IDX_GPRER_LSB]   = STMPE24XX_REG_GPRER_LSB,
 661         [STMPE_IDX_GPFER_LSB]   = STMPE24XX_REG_GPFER_LSB,
 662         [STMPE_IDX_GPAFR_U_MSB] = STMPE24XX_REG_GPAFR_U_MSB,
 663         [STMPE_IDX_IEGPIOR_LSB] = STMPE24XX_REG_IEGPIOR_LSB,
 664         [STMPE_IDX_ISGPIOR_MSB] = STMPE24XX_REG_ISGPIOR_MSB,
 665         [STMPE_IDX_GPEDR_MSB]   = STMPE24XX_REG_GPEDR_MSB,
 666 };
 667
 668 static struct stmpe_variant_block stmpe24xx_blocks[] = {
 669         {
 670                 .cell   = &stmpe_gpio_cell,
 671                 .irq    = STMPE24XX_IRQ_GPIOC,
 672                 .block  = STMPE_BLOCK_GPIO,
 673         },
 674         {
 675                 .cell   = &stmpe_keypad_cell,
 676                 .irq    = STMPE24XX_IRQ_KEYPAD,
 677                 .block  = STMPE_BLOCK_KEYPAD,
 678         },
 679 };
 680
 681 static int stmpe24xx_enable(struct stmpe *stmpe, unsigned int blocks,
 682                             bool enable)
 683 {
 684         unsigned int mask = 0;
 685
 686         if (blocks & STMPE_BLOCK_GPIO)
 687                 mask |= STMPE24XX_SYS_CTRL_ENABLE_GPIO;
 688
 689         if (blocks & STMPE_BLOCK_KEYPAD)
 690                 mask |= STMPE24XX_SYS_CTRL_ENABLE_KPC;
 691
 692         return __stmpe_set_bits(stmpe, STMPE24XX_REG_SYS_CTRL, mask,
 693                                 enable ? mask : 0);
 694 }
 695
 696 static int stmpe24xx_get_altfunc(struct stmpe *stmpe, enum stmpe_block block)
 697 {
 698         switch (block) {
 699         case STMPE_BLOCK_ROTATOR:
 700                 return 2;
 701
 702         case STMPE_BLOCK_KEYPAD:
 703                 return 1;
 704
 705         case STMPE_BLOCK_GPIO:
 706         default:
 707                 return 0;
 708         }
 709 }
 710
 711 static struct stmpe_variant_info stmpe2401 = {
 712         .name           = "stmpe2401",
 713         .id_val         = 0x0101,
 714         .id_mask        = 0xffff,
 715         .num_gpios      = 24,
 716         .af_bits        = 2,
 717         .regs           = stmpe24xx_regs,
 718         .blocks         = stmpe24xx_blocks,
 719         .num_blocks     = ARRAY_SIZE(stmpe24xx_blocks),
 720         .num_irqs       = STMPE24XX_NR_INTERNAL_IRQS,
 721         .enable         = stmpe24xx_enable,
 722         .get_altfunc    = stmpe24xx_get_altfunc,
 723 };
 724
 725 static struct stmpe_variant_info stmpe2403 = {
 726         .name           = "stmpe2403",
 727         .id_val         = 0x0120,
 728         .id_mask        = 0xffff,
 729         .num_gpios      = 24,
 730         .af_bits        = 2,
 731         .regs           = stmpe24xx_regs,
 732         .blocks         = stmpe24xx_blocks,
 733         .num_blocks     = ARRAY_SIZE(stmpe24xx_blocks),
 734         .num_irqs       = STMPE24XX_NR_INTERNAL_IRQS,
 735         .enable         = stmpe24xx_enable,
 736         .get_altfunc    = stmpe24xx_get_altfunc,
 737         .enable_autosleep       = stmpe1601_autosleep, /* same as stmpe1601 */
 738 };
 739
 740 static struct stmpe_variant_info *stmpe_variant_info[STMPE_NBR_PARTS] = {
 741         [STMPE610]      = &stmpe610,
 742         [STMPE801]      = &stmpe801,
 743         [STMPE811]      = &stmpe811,
 744         [STMPE1601]     = &stmpe1601,
 745         [STMPE2401]     = &stmpe2401,
 746         [STMPE2403]     = &stmpe2403,
 747 };
 748
 749 /*
 750  * These devices can be connected in a 'no-irq' configuration - the irq pin
 751  * is not used and the device cannot interrupt the CPU. Here we only list
 752  * devices which support this configuration - the driver will fail probing
 753  * for any devices not listed here which are configured in this way.
 754  */
 755 static struct stmpe_variant_info *stmpe_noirq_variant_info[STMPE_NBR_PARTS] = {
 756         [STMPE801]      = &stmpe801_noirq,
 757 };
 758
 759 static irqreturn_t stmpe_irq(int irq, void *data)
 760 {
 761         struct stmpe *stmpe = data;
 762         struct stmpe_variant_info *variant = stmpe->variant;
 763         int num = DIV_ROUND_UP(variant->num_irqs, 8);
 764         u8 israddr = stmpe->regs[STMPE_IDX_ISR_MSB];
 765         u8 isr[num];
 766         int ret;
 767         int i;
 768
 769         if (variant->id_val == STMPE801_ID) {
 770                 handle_nested_irq(stmpe->irq_base);
 771                 return IRQ_HANDLED;
 772         }
 773
 774         ret = stmpe_block_read(stmpe, israddr, num, isr);
 775         if (ret < 0)
 776                 return IRQ_NONE;
 777
 778         for (i = 0; i < num; i++) {
 779                 int bank = num - i - 1;
 780                 u8 status = isr[i];
 781                 u8 clear;
 782
 783                 status &= stmpe->ier[bank];
 784                 if (!status)
 785                         continue;
 786
 787                 clear = status;
 788                 while (status) {
 789                         int bit = __ffs(status);
 790                         int line = bank * 8 + bit;
 791
 792                         handle_nested_irq(stmpe->irq_base + line);
 793                         status &= ~(1 << bit);
 794                 }
 795
 796                 stmpe_reg_write(stmpe, israddr + i, clear);
 797         }
 798
 799         return IRQ_HANDLED;
 800 }
 801
 802 static void stmpe_irq_lock(struct irq_data *data)
 803 {
 804         struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
 805
 806         mutex_lock(&stmpe->irq_lock);
 807 }
 808
 809 static void stmpe_irq_sync_unlock(struct irq_data *data)
 810 {
 811         struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
 812         struct stmpe_variant_info *variant = stmpe->variant;
 813         int num = DIV_ROUND_UP(variant->num_irqs, 8);
 814         int i;
 815
 816         for (i = 0; i < num; i++) {
 817                 u8 new = stmpe->ier[i];
 818                 u8 old = stmpe->oldier[i];
 819
 820                 if (new == old)
 821                         continue;
 822
 823                 stmpe->oldier[i] = new;
 824                 stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_IER_LSB] - i, new);
 825         }
 826
 827         mutex_unlock(&stmpe->irq_lock);
 828 }
 829
 830 static void stmpe_irq_mask(struct irq_data *data)
 831 {
 832         struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
 833         int offset = data->irq - stmpe->irq_base;
 834         int regoffset = offset / 8;
 835         int mask = 1 << (offset % 8);
 836
 837         stmpe->ier[regoffset] &= ~mask;
 838 }
 839
 840 static void stmpe_irq_unmask(struct irq_data *data)
 841 {
 842         struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
 843         int offset = data->irq - stmpe->irq_base;
 844         int regoffset = offset / 8;
 845         int mask = 1 << (offset % 8);
 846
 847         stmpe->ier[regoffset] |= mask;
 848 }
 849
 850 static struct irq_chip stmpe_irq_chip = {
 851         .name                   = "stmpe",
 852         .irq_bus_lock           = stmpe_irq_lock,
 853         .irq_bus_sync_unlock    = stmpe_irq_sync_unlock,
 854         .irq_mask               = stmpe_irq_mask,
 855         .irq_unmask             = stmpe_irq_unmask,
 856 };
 857
 858 static int __devinit stmpe_irq_init(struct stmpe *stmpe)
 859 {
 860         struct irq_chip *chip = NULL;
 861         int num_irqs = stmpe->variant->num_irqs;
 862         int base = stmpe->irq_base;
 863         int irq;
 864
 865         if (stmpe->variant->id_val != STMPE801_ID)
 866                 chip = &stmpe_irq_chip;
 867
 868         for (irq = base; irq < base + num_irqs; irq++) {
 869                 irq_set_chip_data(irq, stmpe);
 870                 irq_set_chip_and_handler(irq, chip, handle_edge_irq);
 871                 irq_set_nested_thread(irq, 1);
 872 #ifdef CONFIG_ARM
 873                 set_irq_flags(irq, IRQF_VALID);
 874 #else
 875                 irq_set_noprobe(irq);
 876 #endif
 877         }
 878
 879         return 0;
 880 }
 881
 882 static void stmpe_irq_remove(struct stmpe *stmpe)
 883 {
 884         int num_irqs = stmpe->variant->num_irqs;
 885         int base = stmpe->irq_base;
 886         int irq;
 887
 888         for (irq = base; irq < base + num_irqs; irq++) {
 889 #ifdef CONFIG_ARM
 890                 set_irq_flags(irq, 0);
 891 #endif
 892                 irq_set_chip_and_handler(irq, NULL, NULL);
 893                 irq_set_chip_data(irq, NULL);
 894         }
 895 }
 896
 897 static int __devinit stmpe_chip_init(struct stmpe *stmpe)
 898 {
 899         unsigned int irq_trigger = stmpe->pdata->irq_trigger;
 900         int autosleep_timeout = stmpe->pdata->autosleep_timeout;
 901         struct stmpe_variant_info *variant = stmpe->variant;
 902         u8 icr = 0;
 903         unsigned int id;
 904         u8 data[2];
 905         int ret;
 906
 907         ret = stmpe_block_read(stmpe, stmpe->regs[STMPE_IDX_CHIP_ID],
 908                                ARRAY_SIZE(data), data);
 909         if (ret < 0)
 910                 return ret;
 911
 912         id = (data[0] << 8) | data[1];
 913         if ((id & variant->id_mask) != variant->id_val) {
 914                 dev_err(stmpe->dev, "unknown chip id: %#x\n", id);
 915                 return -EINVAL;
 916         }
 917
 918         dev_info(stmpe->dev, "%s detected, chip id: %#x\n", variant->name, id);
 919
 920         /* Disable all modules -- subdrivers should enable what they need. */
 921         ret = stmpe_disable(stmpe, ~0);
 922         if (ret)
 923                 return ret;
 924
 925         if (stmpe->irq >= 0) {
 926                 if (id == STMPE801_ID)
 927                         icr = STMPE801_REG_SYS_CTRL_INT_EN;
 928                 else
 929                         icr = STMPE_ICR_LSB_GIM;
 930
 931                 /* STMPE801 doesn't support Edge interrupts */
 932                 if (id != STMPE801_ID) {
 933                         if (irq_trigger == IRQF_TRIGGER_FALLING ||
 934                                         irq_trigger == IRQF_TRIGGER_RISING)
 935                                 icr |= STMPE_ICR_LSB_EDGE;
 936                 }
 937
 938                 if (irq_trigger == IRQF_TRIGGER_RISING ||
 939                                 irq_trigger == IRQF_TRIGGER_HIGH) {
 940                         if (id == STMPE801_ID)
 941                                 icr |= STMPE801_REG_SYS_CTRL_INT_HI;
 942                         else
 943                                 icr |= STMPE_ICR_LSB_HIGH;
 944                 }
 945
 946                 if (stmpe->pdata->irq_invert_polarity) {
 947                         if (id == STMPE801_ID)
 948                                 icr ^= STMPE801_REG_SYS_CTRL_INT_HI;
 949                         else
 950                                 icr ^= STMPE_ICR_LSB_HIGH;
 951                 }
 952         }
 953
 954         if (stmpe->pdata->autosleep) {
 955                 ret = stmpe_autosleep(stmpe, autosleep_timeout);
 956                 if (ret)
 957                         return ret;
 958         }
 959
 960         return stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_ICR_LSB], icr);
 961 }
 962
 963 static int __devinit stmpe_add_device(struct stmpe *stmpe,
 964                                       struct mfd_cell *cell, int irq)
 965 {
 966         return mfd_add_devices(stmpe->dev, stmpe->pdata->id, cell, 1,
 967                                NULL, stmpe->irq_base + irq, NULL);
 968 }
 969
 970 static int __devinit stmpe_devices_init(struct stmpe *stmpe)
 971 {
 972         struct stmpe_variant_info *variant = stmpe->variant;
 973         unsigned int platform_blocks = stmpe->pdata->blocks;
 974         int ret = -EINVAL;
 975         int i;
 976
 977         for (i = 0; i < variant->num_blocks; i++) {
 978                 struct stmpe_variant_block *block = &variant->blocks[i];
 979
 980                 if (!(platform_blocks & block->block))
 981                         continue;
 982
 983                 platform_blocks &= ~block->block;
 984                 ret = stmpe_add_device(stmpe, block->cell, block->irq);
 985                 if (ret)
 986                         return ret;
 987         }
 988
 989         if (platform_blocks)
 990                 dev_warn(stmpe->dev,
 991                          "platform wants blocks (%#x) not present on variant",
 992                          platform_blocks);
 993
 994         return ret;
 995 }
 996
 997 /* Called from client specific probe routines */
 998 int __devinit stmpe_probe(struct stmpe_client_info *ci, int partnum)
 999 {
1000         struct stmpe_platform_data *pdata = dev_get_platdata(ci->dev);
1001         struct stmpe *stmpe;
1002         int ret;
1003
1004         if (!pdata)
1005                 return -EINVAL;
1006
1007         stmpe = kzalloc(sizeof(struct stmpe), GFP_KERNEL);
1008         if (!stmpe)
1009                 return -ENOMEM;
1010
1011         mutex_init(&stmpe->irq_lock);
1012         mutex_init(&stmpe->lock);
1013
1014         stmpe->dev = ci->dev;
1015         stmpe->client = ci->client;
1016         stmpe->pdata = pdata;
1017         stmpe->irq_base = pdata->irq_base;
1018         stmpe->ci = ci;
1019         stmpe->partnum = partnum;
1020         stmpe->variant = stmpe_variant_info[partnum];
1021         stmpe->regs = stmpe->variant->regs;
1022         stmpe->num_gpios = stmpe->variant->num_gpios;
1023         dev_set_drvdata(stmpe->dev, stmpe);
1024
1025         if (ci->init)
1026                 ci->init(stmpe);
1027
1028         if (pdata->irq_over_gpio) {
1029                 ret = gpio_request_one(pdata->irq_gpio, GPIOF_DIR_IN, "stmpe");
1030                 if (ret) {
1031                         dev_err(stmpe->dev, "failed to request IRQ GPIO: %d\n",
1032                                         ret);
1033                         goto out_free;
1034                 }
1035
1036                 stmpe->irq = gpio_to_irq(pdata->irq_gpio);
1037         } else {
1038                 stmpe->irq = ci->irq;
1039         }
1040
1041         if (stmpe->irq < 0) {
1042                 /* use alternate variant info for no-irq mode, if supported */
1043                 dev_info(stmpe->dev,
1044                         "%s configured in no-irq mode by platform data\n",
1045                         stmpe->variant->name);
1046                 if (!stmpe_noirq_variant_info[stmpe->partnum]) {
1047                         dev_err(stmpe->dev,
1048                                 "%s does not support no-irq mode!\n",
1049                                 stmpe->variant->name);
1050                         ret = -ENODEV;
1051                         goto free_gpio;
1052                 }
1053                 stmpe->variant = stmpe_noirq_variant_info[stmpe->partnum];
1054         }
1055
1056         ret = stmpe_chip_init(stmpe);
1057         if (ret)
1058                 goto free_gpio;
1059
1060         if (stmpe->irq >= 0) {
1061                 ret = stmpe_irq_init(stmpe);
1062                 if (ret)
1063                         goto free_gpio;
1064
1065                 ret = request_threaded_irq(stmpe->irq, NULL, stmpe_irq,
1066                                 pdata->irq_trigger | IRQF_ONESHOT,
1067                                 "stmpe", stmpe);
1068                 if (ret) {
1069                         dev_err(stmpe->dev, "failed to request IRQ: %d\n",
1070                                         ret);
1071                         goto out_removeirq;
1072                 }
1073         }
1074
1075         ret = stmpe_devices_init(stmpe);
1076         if (ret) {
1077                 dev_err(stmpe->dev, "failed to add children\n");
1078                 goto out_removedevs;
1079         }
1080
1081         return 0;
1082
1083 out_removedevs:
1084         mfd_remove_devices(stmpe->dev);
1085         if (stmpe->irq >= 0)
1086                 free_irq(stmpe->irq, stmpe);
1087 out_removeirq:
1088         if (stmpe->irq >= 0)
1089                 stmpe_irq_remove(stmpe);
1090 free_gpio:
1091         if (pdata->irq_over_gpio)
1092                 gpio_free(pdata->irq_gpio);
1093 out_free:
1094         kfree(stmpe);
1095         return ret;
1096 }
1097
1098 int stmpe_remove(struct stmpe *stmpe)
1099 {
1100         mfd_remove_devices(stmpe->dev);
1101
1102         if (stmpe->irq >= 0) {
1103                 free_irq(stmpe->irq, stmpe);
1104                 stmpe_irq_remove(stmpe);
1105         }
1106
1107         if (stmpe->pdata->irq_over_gpio)
1108                 gpio_free(stmpe->pdata->irq_gpio);
1109
1110         kfree(stmpe);
1111
1112         return 0;
1113 }
1114
1115 #ifdef CONFIG_PM
1116 static int stmpe_suspend(struct device *dev)
1117 {
1118         struct stmpe *stmpe = dev_get_drvdata(dev);
1119
1120         if (stmpe->irq >= 0 && device_may_wakeup(dev))
1121                 enable_irq_wake(stmpe->irq);
1122
1123         return 0;
1124 }
1125
1126 static int stmpe_resume(struct device *dev)
1127 {
1128         struct stmpe *stmpe = dev_get_drvdata(dev);
1129
1130         if (stmpe->irq >= 0 && device_may_wakeup(dev))
1131                 disable_irq_wake(stmpe->irq);
1132
1133         return 0;
1134 }
1135
1136 const struct dev_pm_ops stmpe_dev_pm_ops = {
1137         .suspend        = stmpe_suspend,
1138         .resume         = stmpe_resume,
1139 };
1140 #endif