Pileus Git - ~andy/linux/blob - 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         .of_compatible  = "st,stmpe-ts",
 415         .resources      = stmpe_ts_resources,
 416         .num_resources  = ARRAY_SIZE(stmpe_ts_resources),
 417 };
 418
 419 /*
 420  * STMPE811 or STMPE610
 421  */
 422
 423 static const u8 stmpe811_regs[] = {
 424         [STMPE_IDX_CHIP_ID]     = STMPE811_REG_CHIP_ID,
 425         [STMPE_IDX_ICR_LSB]     = STMPE811_REG_INT_CTRL,
 426         [STMPE_IDX_IER_LSB]     = STMPE811_REG_INT_EN,
 427         [STMPE_IDX_ISR_MSB]     = STMPE811_REG_INT_STA,
 428         [STMPE_IDX_GPMR_LSB]    = STMPE811_REG_GPIO_MP_STA,
 429         [STMPE_IDX_GPSR_LSB]    = STMPE811_REG_GPIO_SET_PIN,
 430         [STMPE_IDX_GPCR_LSB]    = STMPE811_REG_GPIO_CLR_PIN,
 431         [STMPE_IDX_GPDR_LSB]    = STMPE811_REG_GPIO_DIR,
 432         [STMPE_IDX_GPRER_LSB]   = STMPE811_REG_GPIO_RE,
 433         [STMPE_IDX_GPFER_LSB]   = STMPE811_REG_GPIO_FE,
 434         [STMPE_IDX_GPAFR_U_MSB] = STMPE811_REG_GPIO_AF,
 435         [STMPE_IDX_IEGPIOR_LSB] = STMPE811_REG_GPIO_INT_EN,
 436         [STMPE_IDX_ISGPIOR_MSB] = STMPE811_REG_GPIO_INT_STA,
 437         [STMPE_IDX_GPEDR_MSB]   = STMPE811_REG_GPIO_ED,
 438 };
 439
 440 static struct stmpe_variant_block stmpe811_blocks[] = {
 441         {
 442                 .cell   = &stmpe_gpio_cell,
 443                 .irq    = STMPE811_IRQ_GPIOC,
 444                 .block  = STMPE_BLOCK_GPIO,
 445         },
 446         {
 447                 .cell   = &stmpe_ts_cell,
 448                 .irq    = STMPE811_IRQ_TOUCH_DET,
 449                 .block  = STMPE_BLOCK_TOUCHSCREEN,
 450         },
 451 };
 452
 453 static int stmpe811_enable(struct stmpe *stmpe, unsigned int blocks,
 454                            bool enable)
 455 {
 456         unsigned int mask = 0;
 457
 458         if (blocks & STMPE_BLOCK_GPIO)
 459                 mask |= STMPE811_SYS_CTRL2_GPIO_OFF;
 460
 461         if (blocks & STMPE_BLOCK_ADC)
 462                 mask |= STMPE811_SYS_CTRL2_ADC_OFF;
 463
 464         if (blocks & STMPE_BLOCK_TOUCHSCREEN)
 465                 mask |= STMPE811_SYS_CTRL2_TSC_OFF;
 466
 467         return __stmpe_set_bits(stmpe, STMPE811_REG_SYS_CTRL2, mask,
 468                                 enable ? 0 : mask);
 469 }
 470
 471 static int stmpe811_get_altfunc(struct stmpe *stmpe, enum stmpe_block block)
 472 {
 473         /* 0 for touchscreen, 1 for GPIO */
 474         return block != STMPE_BLOCK_TOUCHSCREEN;
 475 }
 476
 477 static struct stmpe_variant_info stmpe811 = {
 478         .name           = "stmpe811",
 479         .id_val         = 0x0811,
 480         .id_mask        = 0xffff,
 481         .num_gpios      = 8,
 482         .af_bits        = 1,
 483         .regs           = stmpe811_regs,
 484         .blocks         = stmpe811_blocks,
 485         .num_blocks     = ARRAY_SIZE(stmpe811_blocks),
 486         .num_irqs       = STMPE811_NR_INTERNAL_IRQS,
 487         .enable         = stmpe811_enable,
 488         .get_altfunc    = stmpe811_get_altfunc,
 489 };
 490
 491 /* Similar to 811, except number of gpios */
 492 static struct stmpe_variant_info stmpe610 = {
 493         .name           = "stmpe610",
 494         .id_val         = 0x0811,
 495         .id_mask        = 0xffff,
 496         .num_gpios      = 6,
 497         .af_bits        = 1,
 498         .regs           = stmpe811_regs,
 499         .blocks         = stmpe811_blocks,
 500         .num_blocks     = ARRAY_SIZE(stmpe811_blocks),
 501         .num_irqs       = STMPE811_NR_INTERNAL_IRQS,
 502         .enable         = stmpe811_enable,
 503         .get_altfunc    = stmpe811_get_altfunc,
 504 };
 505
 506 /*
 507  * STMPE1601
 508  */
 509
 510 static const u8 stmpe1601_regs[] = {
 511         [STMPE_IDX_CHIP_ID]     = STMPE1601_REG_CHIP_ID,
 512         [STMPE_IDX_ICR_LSB]     = STMPE1601_REG_ICR_LSB,
 513         [STMPE_IDX_IER_LSB]     = STMPE1601_REG_IER_LSB,
 514         [STMPE_IDX_ISR_MSB]     = STMPE1601_REG_ISR_MSB,
 515         [STMPE_IDX_GPMR_LSB]    = STMPE1601_REG_GPIO_MP_LSB,
 516         [STMPE_IDX_GPSR_LSB]    = STMPE1601_REG_GPIO_SET_LSB,
 517         [STMPE_IDX_GPCR_LSB]    = STMPE1601_REG_GPIO_CLR_LSB,
 518         [STMPE_IDX_GPDR_LSB]    = STMPE1601_REG_GPIO_SET_DIR_LSB,
 519         [STMPE_IDX_GPRER_LSB]   = STMPE1601_REG_GPIO_RE_LSB,
 520         [STMPE_IDX_GPFER_LSB]   = STMPE1601_REG_GPIO_FE_LSB,
 521         [STMPE_IDX_GPAFR_U_MSB] = STMPE1601_REG_GPIO_AF_U_MSB,
 522         [STMPE_IDX_IEGPIOR_LSB] = STMPE1601_REG_INT_EN_GPIO_MASK_LSB,
 523         [STMPE_IDX_ISGPIOR_MSB] = STMPE1601_REG_INT_STA_GPIO_MSB,
 524         [STMPE_IDX_GPEDR_MSB]   = STMPE1601_REG_GPIO_ED_MSB,
 525 };
 526
 527 static struct stmpe_variant_block stmpe1601_blocks[] = {
 528         {
 529                 .cell   = &stmpe_gpio_cell,
 530                 .irq    = STMPE24XX_IRQ_GPIOC,
 531                 .block  = STMPE_BLOCK_GPIO,
 532         },
 533         {
 534                 .cell   = &stmpe_keypad_cell,
 535                 .irq    = STMPE24XX_IRQ_KEYPAD,
 536                 .block  = STMPE_BLOCK_KEYPAD,
 537         },
 538 };
 539
 540 /* supported autosleep timeout delay (in msecs) */
 541 static const int stmpe_autosleep_delay[] = {
 542         4, 16, 32, 64, 128, 256, 512, 1024,
 543 };
 544
 545 static int stmpe_round_timeout(int timeout)
 546 {
 547         int i;
 548
 549         for (i = 0; i < ARRAY_SIZE(stmpe_autosleep_delay); i++) {
 550                 if (stmpe_autosleep_delay[i] >= timeout)
 551                         return i;
 552         }
 553
 554         /*
 555          * requests for delays longer than supported should not return the
 556          * longest supported delay
 557          */
 558         return -EINVAL;
 559 }
 560
 561 static int stmpe_autosleep(struct stmpe *stmpe, int autosleep_timeout)
 562 {
 563         int ret;
 564
 565         if (!stmpe->variant->enable_autosleep)
 566                 return -ENOSYS;
 567
 568         mutex_lock(&stmpe->lock);
 569         ret = stmpe->variant->enable_autosleep(stmpe, autosleep_timeout);
 570         mutex_unlock(&stmpe->lock);
 571
 572         return ret;
 573 }
 574
 575 /*
 576  * Both stmpe 1601/2403 support same layout for autosleep
 577  */
 578 static int stmpe1601_autosleep(struct stmpe *stmpe,
 579                 int autosleep_timeout)
 580 {
 581         int ret, timeout;
 582
 583         /* choose the best available timeout */
 584         timeout = stmpe_round_timeout(autosleep_timeout);
 585         if (timeout < 0) {
 586                 dev_err(stmpe->dev, "invalid timeout\n");
 587                 return timeout;
 588         }
 589
 590         ret = __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL2,
 591                         STMPE1601_AUTOSLEEP_TIMEOUT_MASK,
 592                         timeout);
 593         if (ret < 0)
 594                 return ret;
 595
 596         return __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL2,
 597                         STPME1601_AUTOSLEEP_ENABLE,
 598                         STPME1601_AUTOSLEEP_ENABLE);
 599 }
 600
 601 static int stmpe1601_enable(struct stmpe *stmpe, unsigned int blocks,
 602                             bool enable)
 603 {
 604         unsigned int mask = 0;
 605
 606         if (blocks & STMPE_BLOCK_GPIO)
 607                 mask |= STMPE1601_SYS_CTRL_ENABLE_GPIO;
 608
 609         if (blocks & STMPE_BLOCK_KEYPAD)
 610                 mask |= STMPE1601_SYS_CTRL_ENABLE_KPC;
 611
 612         return __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL, mask,
 613                                 enable ? mask : 0);
 614 }
 615
 616 static int stmpe1601_get_altfunc(struct stmpe *stmpe, enum stmpe_block block)
 617 {
 618         switch (block) {
 619         case STMPE_BLOCK_PWM:
 620                 return 2;
 621
 622         case STMPE_BLOCK_KEYPAD:
 623                 return 1;
 624
 625         case STMPE_BLOCK_GPIO:
 626         default:
 627                 return 0;
 628         }
 629 }
 630
 631 static struct stmpe_variant_info stmpe1601 = {
 632         .name           = "stmpe1601",
 633         .id_val         = 0x0210,
 634         .id_mask        = 0xfff0,       /* at least 0x0210 and 0x0212 */
 635         .num_gpios      = 16,
 636         .af_bits        = 2,
 637         .regs           = stmpe1601_regs,
 638         .blocks         = stmpe1601_blocks,
 639         .num_blocks     = ARRAY_SIZE(stmpe1601_blocks),
 640         .num_irqs       = STMPE1601_NR_INTERNAL_IRQS,
 641         .enable         = stmpe1601_enable,
 642         .get_altfunc    = stmpe1601_get_altfunc,
 643         .enable_autosleep       = stmpe1601_autosleep,
 644 };
 645
 646 /*
 647  * STMPE24XX
 648  */
 649
 650 static const u8 stmpe24xx_regs[] = {
 651         [STMPE_IDX_CHIP_ID]     = STMPE24XX_REG_CHIP_ID,
 652         [STMPE_IDX_ICR_LSB]     = STMPE24XX_REG_ICR_LSB,
 653         [STMPE_IDX_IER_LSB]     = STMPE24XX_REG_IER_LSB,
 654         [STMPE_IDX_ISR_MSB]     = STMPE24XX_REG_ISR_MSB,
 655         [STMPE_IDX_GPMR_LSB]    = STMPE24XX_REG_GPMR_LSB,
 656         [STMPE_IDX_GPSR_LSB]    = STMPE24XX_REG_GPSR_LSB,
 657         [STMPE_IDX_GPCR_LSB]    = STMPE24XX_REG_GPCR_LSB,
 658         [STMPE_IDX_GPDR_LSB]    = STMPE24XX_REG_GPDR_LSB,
 659         [STMPE_IDX_GPRER_LSB]   = STMPE24XX_REG_GPRER_LSB,
 660         [STMPE_IDX_GPFER_LSB]   = STMPE24XX_REG_GPFER_LSB,
 661         [STMPE_IDX_GPAFR_U_MSB] = STMPE24XX_REG_GPAFR_U_MSB,
 662         [STMPE_IDX_IEGPIOR_LSB] = STMPE24XX_REG_IEGPIOR_LSB,
 663         [STMPE_IDX_ISGPIOR_MSB] = STMPE24XX_REG_ISGPIOR_MSB,
 664         [STMPE_IDX_GPEDR_MSB]   = STMPE24XX_REG_GPEDR_MSB,
 665 };
 666
 667 static struct stmpe_variant_block stmpe24xx_blocks[] = {
 668         {
 669                 .cell   = &stmpe_gpio_cell,
 670                 .irq    = STMPE24XX_IRQ_GPIOC,
 671                 .block  = STMPE_BLOCK_GPIO,
 672         },
 673         {
 674                 .cell   = &stmpe_keypad_cell,
 675                 .irq    = STMPE24XX_IRQ_KEYPAD,
 676                 .block  = STMPE_BLOCK_KEYPAD,
 677         },
 678 };
 679
 680 static int stmpe24xx_enable(struct stmpe *stmpe, unsigned int blocks,
 681                             bool enable)
 682 {
 683         unsigned int mask = 0;
 684
 685         if (blocks & STMPE_BLOCK_GPIO)
 686                 mask |= STMPE24XX_SYS_CTRL_ENABLE_GPIO;
 687
 688         if (blocks & STMPE_BLOCK_KEYPAD)
 689                 mask |= STMPE24XX_SYS_CTRL_ENABLE_KPC;
 690
 691         return __stmpe_set_bits(stmpe, STMPE24XX_REG_SYS_CTRL, mask,
 692                                 enable ? mask : 0);
 693 }
 694
 695 static int stmpe24xx_get_altfunc(struct stmpe *stmpe, enum stmpe_block block)
 696 {
 697         switch (block) {
 698         case STMPE_BLOCK_ROTATOR:
 699                 return 2;
 700
 701         case STMPE_BLOCK_KEYPAD:
 702                 return 1;
 703
 704         case STMPE_BLOCK_GPIO:
 705         default:
 706                 return 0;
 707         }
 708 }
 709
 710 static struct stmpe_variant_info stmpe2401 = {
 711         .name           = "stmpe2401",
 712         .id_val         = 0x0101,
 713         .id_mask        = 0xffff,
 714         .num_gpios      = 24,
 715         .af_bits        = 2,
 716         .regs           = stmpe24xx_regs,
 717         .blocks         = stmpe24xx_blocks,
 718         .num_blocks     = ARRAY_SIZE(stmpe24xx_blocks),
 719         .num_irqs       = STMPE24XX_NR_INTERNAL_IRQS,
 720         .enable         = stmpe24xx_enable,
 721         .get_altfunc    = stmpe24xx_get_altfunc,
 722 };
 723
 724 static struct stmpe_variant_info stmpe2403 = {
 725         .name           = "stmpe2403",
 726         .id_val         = 0x0120,
 727         .id_mask        = 0xffff,
 728         .num_gpios      = 24,
 729         .af_bits        = 2,
 730         .regs           = stmpe24xx_regs,
 731         .blocks         = stmpe24xx_blocks,
 732         .num_blocks     = ARRAY_SIZE(stmpe24xx_blocks),
 733         .num_irqs       = STMPE24XX_NR_INTERNAL_IRQS,
 734         .enable         = stmpe24xx_enable,
 735         .get_altfunc    = stmpe24xx_get_altfunc,
 736         .enable_autosleep       = stmpe1601_autosleep, /* same as stmpe1601 */
 737 };
 738
 739 static struct stmpe_variant_info *stmpe_variant_info[STMPE_NBR_PARTS] = {
 740         [STMPE610]      = &stmpe610,
 741         [STMPE801]      = &stmpe801,
 742         [STMPE811]      = &stmpe811,
 743         [STMPE1601]     = &stmpe1601,
 744         [STMPE2401]     = &stmpe2401,
 745         [STMPE2403]     = &stmpe2403,
 746 };
 747
 748 /*
 749  * These devices can be connected in a 'no-irq' configuration - the irq pin
 750  * is not used and the device cannot interrupt the CPU. Here we only list
 751  * devices which support this configuration - the driver will fail probing
 752  * for any devices not listed here which are configured in this way.
 753  */
 754 static struct stmpe_variant_info *stmpe_noirq_variant_info[STMPE_NBR_PARTS] = {
 755         [STMPE801]      = &stmpe801_noirq,
 756 };
 757
 758 static irqreturn_t stmpe_irq(int irq, void *data)
 759 {
 760         struct stmpe *stmpe = data;
 761         struct stmpe_variant_info *variant = stmpe->variant;
 762         int num = DIV_ROUND_UP(variant->num_irqs, 8);
 763         u8 israddr = stmpe->regs[STMPE_IDX_ISR_MSB];
 764         u8 isr[num];
 765         int ret;
 766         int i;
 767
 768         if (variant->id_val == STMPE801_ID) {
 769                 handle_nested_irq(stmpe->irq_base);
 770                 return IRQ_HANDLED;
 771         }
 772
 773         ret = stmpe_block_read(stmpe, israddr, num, isr);
 774         if (ret < 0)
 775                 return IRQ_NONE;
 776
 777         for (i = 0; i < num; i++) {
 778                 int bank = num - i - 1;
 779                 u8 status = isr[i];
 780                 u8 clear;
 781
 782                 status &= stmpe->ier[bank];
 783                 if (!status)
 784                         continue;
 785
 786                 clear = status;
 787                 while (status) {
 788                         int bit = __ffs(status);
 789                         int line = bank * 8 + bit;
 790
 791                         handle_nested_irq(stmpe->irq_base + line);
 792                         status &= ~(1 << bit);
 793                 }
 794
 795                 stmpe_reg_write(stmpe, israddr + i, clear);
 796         }
 797
 798         return IRQ_HANDLED;
 799 }
 800
 801 static void stmpe_irq_lock(struct irq_data *data)
 802 {
 803         struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
 804
 805         mutex_lock(&stmpe->irq_lock);
 806 }
 807
 808 static void stmpe_irq_sync_unlock(struct irq_data *data)
 809 {
 810         struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
 811         struct stmpe_variant_info *variant = stmpe->variant;
 812         int num = DIV_ROUND_UP(variant->num_irqs, 8);
 813         int i;
 814
 815         for (i = 0; i < num; i++) {
 816                 u8 new = stmpe->ier[i];
 817                 u8 old = stmpe->oldier[i];
 818
 819                 if (new == old)
 820                         continue;
 821
 822                 stmpe->oldier[i] = new;
 823                 stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_IER_LSB] - i, new);
 824         }
 825
 826         mutex_unlock(&stmpe->irq_lock);
 827 }
 828
 829 static void stmpe_irq_mask(struct irq_data *data)
 830 {
 831         struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
 832         int offset = data->irq - stmpe->irq_base;
 833         int regoffset = offset / 8;
 834         int mask = 1 << (offset % 8);
 835
 836         stmpe->ier[regoffset] &= ~mask;
 837 }
 838
 839 static void stmpe_irq_unmask(struct irq_data *data)
 840 {
 841         struct stmpe *stmpe = irq_data_get_irq_chip_data(data);
 842         int offset = data->irq - stmpe->irq_base;
 843         int regoffset = offset / 8;
 844         int mask = 1 << (offset % 8);
 845
 846         stmpe->ier[regoffset] |= mask;
 847 }
 848
 849 static struct irq_chip stmpe_irq_chip = {
 850         .name                   = "stmpe",
 851         .irq_bus_lock           = stmpe_irq_lock,
 852         .irq_bus_sync_unlock    = stmpe_irq_sync_unlock,
 853         .irq_mask               = stmpe_irq_mask,
 854         .irq_unmask             = stmpe_irq_unmask,
 855 };
 856
 857 static int __devinit stmpe_irq_init(struct stmpe *stmpe)
 858 {
 859         struct irq_chip *chip = NULL;
 860         int num_irqs = stmpe->variant->num_irqs;
 861         int base = stmpe->irq_base;
 862         int irq;
 863
 864         if (stmpe->variant->id_val != STMPE801_ID)
 865                 chip = &stmpe_irq_chip;
 866
 867         for (irq = base; irq < base + num_irqs; irq++) {
 868                 irq_set_chip_data(irq, stmpe);
 869                 irq_set_chip_and_handler(irq, chip, handle_edge_irq);
 870                 irq_set_nested_thread(irq, 1);
 871 #ifdef CONFIG_ARM
 872                 set_irq_flags(irq, IRQF_VALID);
 873 #else
 874                 irq_set_noprobe(irq);
 875 #endif
 876         }
 877
 878         return 0;
 879 }
 880
 881 static void stmpe_irq_remove(struct stmpe *stmpe)
 882 {
 883         int num_irqs = stmpe->variant->num_irqs;
 884         int base = stmpe->irq_base;
 885         int irq;
 886
 887         for (irq = base; irq < base + num_irqs; irq++) {
 888 #ifdef CONFIG_ARM
 889                 set_irq_flags(irq, 0);
 890 #endif
 891                 irq_set_chip_and_handler(irq, NULL, NULL);
 892                 irq_set_chip_data(irq, NULL);
 893         }
 894 }
 895
 896 static int __devinit stmpe_chip_init(struct stmpe *stmpe)
 897 {
 898         unsigned int irq_trigger = stmpe->pdata->irq_trigger;
 899         int autosleep_timeout = stmpe->pdata->autosleep_timeout;
 900         struct stmpe_variant_info *variant = stmpe->variant;
 901         u8 icr = 0;
 902         unsigned int id;
 903         u8 data[2];
 904         int ret;
 905
 906         ret = stmpe_block_read(stmpe, stmpe->regs[STMPE_IDX_CHIP_ID],
 907                                ARRAY_SIZE(data), data);
 908         if (ret < 0)
 909                 return ret;
 910
 911         id = (data[0] << 8) | data[1];
 912         if ((id & variant->id_mask) != variant->id_val) {
 913                 dev_err(stmpe->dev, "unknown chip id: %#x\n", id);
 914                 return -EINVAL;
 915         }
 916
 917         dev_info(stmpe->dev, "%s detected, chip id: %#x\n", variant->name, id);
 918
 919         /* Disable all modules -- subdrivers should enable what they need. */
 920         ret = stmpe_disable(stmpe, ~0);
 921         if (ret)
 922                 return ret;
 923
 924         if (stmpe->irq >= 0) {
 925                 if (id == STMPE801_ID)
 926                         icr = STMPE801_REG_SYS_CTRL_INT_EN;
 927                 else
 928                         icr = STMPE_ICR_LSB_GIM;
 929
 930                 /* STMPE801 doesn't support Edge interrupts */
 931                 if (id != STMPE801_ID) {
 932                         if (irq_trigger == IRQF_TRIGGER_FALLING ||
 933                                         irq_trigger == IRQF_TRIGGER_RISING)
 934                                 icr |= STMPE_ICR_LSB_EDGE;
 935                 }
 936
 937                 if (irq_trigger == IRQF_TRIGGER_RISING ||
 938                                 irq_trigger == IRQF_TRIGGER_HIGH) {
 939                         if (id == STMPE801_ID)
 940                                 icr |= STMPE801_REG_SYS_CTRL_INT_HI;
 941                         else
 942                                 icr |= STMPE_ICR_LSB_HIGH;
 943                 }
 944
 945                 if (stmpe->pdata->irq_invert_polarity) {
 946                         if (id == STMPE801_ID)
 947                                 icr ^= STMPE801_REG_SYS_CTRL_INT_HI;
 948                         else
 949                                 icr ^= STMPE_ICR_LSB_HIGH;
 950                 }
 951         }
 952
 953         if (stmpe->pdata->autosleep) {
 954                 ret = stmpe_autosleep(stmpe, autosleep_timeout);
 955                 if (ret)
 956                         return ret;
 957         }
 958
 959         return stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_ICR_LSB], icr);
 960 }
 961
 962 static int __devinit stmpe_add_device(struct stmpe *stmpe,
 963                                       struct mfd_cell *cell, int irq)
 964 {
 965         return mfd_add_devices(stmpe->dev, stmpe->pdata->id, cell, 1,
 966                                NULL, stmpe->irq_base + irq, NULL);
 967 }
 968
 969 static int __devinit stmpe_devices_init(struct stmpe *stmpe)
 970 {
 971         struct stmpe_variant_info *variant = stmpe->variant;
 972         unsigned int platform_blocks = stmpe->pdata->blocks;
 973         int ret = -EINVAL;
 974         int i;
 975
 976         for (i = 0; i < variant->num_blocks; i++) {
 977                 struct stmpe_variant_block *block = &variant->blocks[i];
 978
 979                 if (!(platform_blocks & block->block))
 980                         continue;
 981
 982                 platform_blocks &= ~block->block;
 983                 ret = stmpe_add_device(stmpe, block->cell, block->irq);
 984                 if (ret)
 985                         return ret;
 986         }
 987
 988         if (platform_blocks)
 989                 dev_warn(stmpe->dev,
 990                          "platform wants blocks (%#x) not present on variant",
 991                          platform_blocks);
 992
 993         return ret;
 994 }
 995
 996 /* Called from client specific probe routines */
 997 int __devinit stmpe_probe(struct stmpe_client_info *ci, int partnum)
 998 {
 999         struct stmpe_platform_data *pdata = dev_get_platdata(ci->dev);
1000         struct stmpe *stmpe;
1001         int ret;
1002
1003         if (!pdata)
1004                 return -EINVAL;
1005
1006         stmpe = kzalloc(sizeof(struct stmpe), GFP_KERNEL);
1007         if (!stmpe)
1008                 return -ENOMEM;
1009
1010         mutex_init(&stmpe->irq_lock);
1011         mutex_init(&stmpe->lock);
1012
1013         stmpe->dev = ci->dev;
1014         stmpe->client = ci->client;
1015         stmpe->pdata = pdata;
1016         stmpe->irq_base = pdata->irq_base;
1017         stmpe->ci = ci;
1018         stmpe->partnum = partnum;
1019         stmpe->variant = stmpe_variant_info[partnum];
1020         stmpe->regs = stmpe->variant->regs;
1021         stmpe->num_gpios = stmpe->variant->num_gpios;
1022         dev_set_drvdata(stmpe->dev, stmpe);
1023
1024         if (ci->init)
1025                 ci->init(stmpe);
1026
1027         if (pdata->irq_over_gpio) {
1028                 ret = gpio_request_one(pdata->irq_gpio, GPIOF_DIR_IN, "stmpe");
1029                 if (ret) {
1030                         dev_err(stmpe->dev, "failed to request IRQ GPIO: %d\n",
1031                                         ret);
1032                         goto out_free;
1033                 }
1034
1035                 stmpe->irq = gpio_to_irq(pdata->irq_gpio);
1036         } else {
1037                 stmpe->irq = ci->irq;
1038         }
1039
1040         if (stmpe->irq < 0) {
1041                 /* use alternate variant info for no-irq mode, if supported */
1042                 dev_info(stmpe->dev,
1043                         "%s configured in no-irq mode by platform data\n",
1044                         stmpe->variant->name);
1045                 if (!stmpe_noirq_variant_info[stmpe->partnum]) {
1046                         dev_err(stmpe->dev,
1047                                 "%s does not support no-irq mode!\n",
1048                                 stmpe->variant->name);
1049                         ret = -ENODEV;
1050                         goto free_gpio;
1051                 }
1052                 stmpe->variant = stmpe_noirq_variant_info[stmpe->partnum];
1053         }
1054
1055         ret = stmpe_chip_init(stmpe);
1056         if (ret)
1057                 goto free_gpio;
1058
1059         if (stmpe->irq >= 0) {
1060                 ret = stmpe_irq_init(stmpe);
1061                 if (ret)
1062                         goto free_gpio;
1063
1064                 ret = request_threaded_irq(stmpe->irq, NULL, stmpe_irq,
1065                                 pdata->irq_trigger | IRQF_ONESHOT,
1066                                 "stmpe", stmpe);
1067                 if (ret) {
1068                         dev_err(stmpe->dev, "failed to request IRQ: %d\n",
1069                                         ret);
1070                         goto out_removeirq;
1071                 }
1072         }
1073
1074         ret = stmpe_devices_init(stmpe);
1075         if (ret) {
1076                 dev_err(stmpe->dev, "failed to add children\n");
1077                 goto out_removedevs;
1078         }
1079
1080         return 0;
1081
1082 out_removedevs:
1083         mfd_remove_devices(stmpe->dev);
1084         if (stmpe->irq >= 0)
1085                 free_irq(stmpe->irq, stmpe);
1086 out_removeirq:
1087         if (stmpe->irq >= 0)
1088                 stmpe_irq_remove(stmpe);
1089 free_gpio:
1090         if (pdata->irq_over_gpio)
1091                 gpio_free(pdata->irq_gpio);
1092 out_free:
1093         kfree(stmpe);
1094         return ret;
1095 }
1096
1097 int stmpe_remove(struct stmpe *stmpe)
1098 {
1099         mfd_remove_devices(stmpe->dev);
1100
1101         if (stmpe->irq >= 0) {
1102                 free_irq(stmpe->irq, stmpe);
1103                 stmpe_irq_remove(stmpe);
1104         }
1105
1106         if (stmpe->pdata->irq_over_gpio)
1107                 gpio_free(stmpe->pdata->irq_gpio);
1108
1109         kfree(stmpe);
1110
1111         return 0;
1112 }
1113
1114 #ifdef CONFIG_PM
1115 static int stmpe_suspend(struct device *dev)
1116 {
1117         struct stmpe *stmpe = dev_get_drvdata(dev);
1118
1119         if (stmpe->irq >= 0 && device_may_wakeup(dev))
1120                 enable_irq_wake(stmpe->irq);
1121
1122         return 0;
1123 }
1124
1125 static int stmpe_resume(struct device *dev)
1126 {
1127         struct stmpe *stmpe = dev_get_drvdata(dev);
1128
1129         if (stmpe->irq >= 0 && device_may_wakeup(dev))
1130                 disable_irq_wake(stmpe->irq);
1131
1132         return 0;
1133 }
1134
1135 const struct dev_pm_ops stmpe_dev_pm_ops = {
1136         .suspend        = stmpe_suspend,
1137         .resume         = stmpe_resume,
1138 };
1139 #endif