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