1 /* 2 * ST Microelectronics MFD: stmpe's driver 3 * 4 * Copyright (C) ST-Ericsson SA 2010 5 * 6 * License Terms: GNU General Public License, version 2 7 * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson 8 */ 9 10 #include <linux/err.h> 11 #include <linux/gpio.h> 12 #include <linux/export.h> 13 #include <linux/kernel.h> 14 #include <linux/interrupt.h> 15 #include <linux/irq.h> 16 #include <linux/irqdomain.h> 17 #include <linux/of.h> 18 #include <linux/of_gpio.h> 19 #include <linux/pm.h> 20 #include <linux/slab.h> 21 #include <linux/mfd/core.h> 22 #include <linux/delay.h> 23 #include <linux/regulator/consumer.h> 24 #include "stmpe.h" 25 26 static int __stmpe_enable(struct stmpe *stmpe, unsigned int blocks) 27 { 28 return stmpe->variant->enable(stmpe, blocks, true); 29 } 30 31 static int __stmpe_disable(struct stmpe *stmpe, unsigned int blocks) 32 { 33 return stmpe->variant->enable(stmpe, blocks, false); 34 } 35 36 static int __stmpe_reg_read(struct stmpe *stmpe, u8 reg) 37 { 38 int ret; 39 40 ret = stmpe->ci->read_byte(stmpe, reg); 41 if (ret < 0) 42 dev_err(stmpe->dev, "failed to read reg %#x: %d\n", reg, ret); 43 44 dev_vdbg(stmpe->dev, "rd: reg %#x => data %#x\n", reg, ret); 45 46 return ret; 47 } 48 49 static int __stmpe_reg_write(struct stmpe *stmpe, u8 reg, u8 val) 50 { 51 int ret; 52 53 dev_vdbg(stmpe->dev, "wr: reg %#x <= %#x\n", reg, val); 54 55 ret = stmpe->ci->write_byte(stmpe, reg, val); 56 if (ret < 0) 57 dev_err(stmpe->dev, "failed to write reg %#x: %d\n", reg, ret); 58 59 return ret; 60 } 61 62 static int __stmpe_set_bits(struct stmpe *stmpe, u8 reg, u8 mask, u8 val) 63 { 64 int ret; 65 66 ret = __stmpe_reg_read(stmpe, reg); 67 if (ret < 0) 68 return ret; 69 70 ret &= ~mask; 71 ret |= val; 72 73 return __stmpe_reg_write(stmpe, reg, ret); 74 } 75 76 static int __stmpe_block_read(struct stmpe *stmpe, u8 reg, u8 length, 77 u8 *values) 78 { 79 int ret; 80 81 ret = stmpe->ci->read_block(stmpe, reg, length, values); 82 if (ret < 0) 83 dev_err(stmpe->dev, "failed to read regs %#x: %d\n", reg, ret); 84 85 dev_vdbg(stmpe->dev, "rd: reg %#x (%d) => ret %#x\n", reg, length, ret); 86 stmpe_dump_bytes("stmpe rd: ", values, length); 87 88 return ret; 89 } 90 91 static int __stmpe_block_write(struct stmpe *stmpe, u8 reg, u8 length, 92 const u8 *values) 93 { 94 int ret; 95 96 dev_vdbg(stmpe->dev, "wr: regs %#x (%d)\n", reg, length); 97 stmpe_dump_bytes("stmpe wr: ", values, length); 98 99 ret = stmpe->ci->write_block(stmpe, reg, length, values); 100 if (ret < 0) 101 dev_err(stmpe->dev, "failed to write regs %#x: %d\n", reg, ret); 102 103 return ret; 104 } 105 106 /** 107 * stmpe_enable - enable blocks on an STMPE device 108 * @stmpe: Device to work on 109 * @blocks: Mask of blocks (enum stmpe_block values) to enable 110 */ 111 int stmpe_enable(struct stmpe *stmpe, unsigned int blocks) 112 { 113 int ret; 114 115 mutex_lock(&stmpe->lock); 116 ret = __stmpe_enable(stmpe, blocks); 117 mutex_unlock(&stmpe->lock); 118 119 return ret; 120 } 121 EXPORT_SYMBOL_GPL(stmpe_enable); 122 123 /** 124 * stmpe_disable - disable blocks on an STMPE device 125 * @stmpe: Device to work on 126 * @blocks: Mask of blocks (enum stmpe_block values) to enable 127 */ 128 int stmpe_disable(struct stmpe *stmpe, unsigned int blocks) 129 { 130 int ret; 131 132 mutex_lock(&stmpe->lock); 133 ret = __stmpe_disable(stmpe, blocks); 134 mutex_unlock(&stmpe->lock); 135 136 return ret; 137 } 138 EXPORT_SYMBOL_GPL(stmpe_disable); 139 140 /** 141 * stmpe_reg_read() - read a single STMPE register 142 * @stmpe: Device to read from 143 * @reg: Register to read 144 */ 145 int stmpe_reg_read(struct stmpe *stmpe, u8 reg) 146 { 147 int ret; 148 149 mutex_lock(&stmpe->lock); 150 ret = __stmpe_reg_read(stmpe, reg); 151 mutex_unlock(&stmpe->lock); 152 153 return ret; 154 } 155 EXPORT_SYMBOL_GPL(stmpe_reg_read); 156 157 /** 158 * stmpe_reg_write() - write a single STMPE register 159 * @stmpe: Device to write to 160 * @reg: Register to write 161 * @val: Value to write 162 */ 163 int stmpe_reg_write(struct stmpe *stmpe, u8 reg, u8 val) 164 { 165 int ret; 166 167 mutex_lock(&stmpe->lock); 168 ret = __stmpe_reg_write(stmpe, reg, val); 169 mutex_unlock(&stmpe->lock); 170 171 return ret; 172 } 173 EXPORT_SYMBOL_GPL(stmpe_reg_write); 174 175 /** 176 * stmpe_set_bits() - set the value of a bitfield in a STMPE register 177 * @stmpe: Device to write to 178 * @reg: Register to write 179 * @mask: Mask of bits to set 180 * @val: Value to set 181 */ 182 int stmpe_set_bits(struct stmpe *stmpe, u8 reg, u8 mask, u8 val) 183 { 184 int ret; 185 186 mutex_lock(&stmpe->lock); 187 ret = __stmpe_set_bits(stmpe, reg, mask, val); 188 mutex_unlock(&stmpe->lock); 189 190 return ret; 191 } 192 EXPORT_SYMBOL_GPL(stmpe_set_bits); 193 194 /** 195 * stmpe_block_read() - read multiple STMPE registers 196 * @stmpe: Device to read from 197 * @reg: First register 198 * @length: Number of registers 199 * @values: Buffer to write to 200 */ 201 int stmpe_block_read(struct stmpe *stmpe, u8 reg, u8 length, u8 *values) 202 { 203 int ret; 204 205 mutex_lock(&stmpe->lock); 206 ret = __stmpe_block_read(stmpe, reg, length, values); 207 mutex_unlock(&stmpe->lock); 208 209 return ret; 210 } 211 EXPORT_SYMBOL_GPL(stmpe_block_read); 212 213 /** 214 * stmpe_block_write() - write multiple STMPE registers 215 * @stmpe: Device to write to 216 * @reg: First register 217 * @length: Number of registers 218 * @values: Values to write 219 */ 220 int stmpe_block_write(struct stmpe *stmpe, u8 reg, u8 length, 221 const u8 *values) 222 { 223 int ret; 224 225 mutex_lock(&stmpe->lock); 226 ret = __stmpe_block_write(stmpe, reg, length, values); 227 mutex_unlock(&stmpe->lock); 228 229 return ret; 230 } 231 EXPORT_SYMBOL_GPL(stmpe_block_write); 232 233 /** 234 * stmpe_set_altfunc()- set the alternate function for STMPE pins 235 * @stmpe: Device to configure 236 * @pins: Bitmask of pins to affect 237 * @block: block to enable alternate functions for 238 * 239 * @pins is assumed to have a bit set for each of the bits whose alternate 240 * function is to be changed, numbered according to the GPIOXY numbers. 241 * 242 * If the GPIO module is not enabled, this function automatically enables it in 243 * order to perform the change. 244 */ 245 int stmpe_set_altfunc(struct stmpe *stmpe, u32 pins, enum stmpe_block block) 246 { 247 struct stmpe_variant_info *variant = stmpe->variant; 248 u8 regaddr = stmpe->regs[STMPE_IDX_GPAFR_U_MSB]; 249 int af_bits = variant->af_bits; 250 int numregs = DIV_ROUND_UP(stmpe->num_gpios * af_bits, 8); 251 int mask = (1 << af_bits) - 1; 252 u8 regs[8]; 253 int af, afperreg, ret; 254 255 if (!variant->get_altfunc) 256 return 0; 257 258 afperreg = 8 / af_bits; 259 mutex_lock(&stmpe->lock); 260 261 ret = __stmpe_enable(stmpe, STMPE_BLOCK_GPIO); 262 if (ret < 0) 263 goto out; 264 265 ret = __stmpe_block_read(stmpe, regaddr, numregs, regs); 266 if (ret < 0) 267 goto out; 268 269 af = variant->get_altfunc(stmpe, block); 270 271 while (pins) { 272 int pin = __ffs(pins); 273 int regoffset = numregs - (pin / afperreg) - 1; 274 int pos = (pin % afperreg) * (8 / afperreg); 275 276 regs[regoffset] &= ~(mask << pos); 277 regs[regoffset] |= af << pos; 278 279 pins &= ~(1 << pin); 280 } 281 282 ret = __stmpe_block_write(stmpe, regaddr, numregs, regs); 283 284 out: 285 mutex_unlock(&stmpe->lock); 286 return ret; 287 } 288 EXPORT_SYMBOL_GPL(stmpe_set_altfunc); 289 290 /* 291 * GPIO (all variants) 292 */ 293 294 static struct resource stmpe_gpio_resources[] = { 295 /* Start and end filled dynamically */ 296 { 297 .flags = IORESOURCE_IRQ, 298 }, 299 }; 300 301 static const struct mfd_cell stmpe_gpio_cell = { 302 .name = "stmpe-gpio", 303 .of_compatible = "st,stmpe-gpio", 304 .resources = stmpe_gpio_resources, 305 .num_resources = ARRAY_SIZE(stmpe_gpio_resources), 306 }; 307 308 static const struct mfd_cell stmpe_gpio_cell_noirq = { 309 .name = "stmpe-gpio", 310 .of_compatible = "st,stmpe-gpio", 311 /* gpio cell resources consist of an irq only so no resources here */ 312 }; 313 314 /* 315 * Keypad (1601, 2401, 2403) 316 */ 317 318 static struct resource stmpe_keypad_resources[] = { 319 { 320 .name = "KEYPAD", 321 .flags = IORESOURCE_IRQ, 322 }, 323 { 324 .name = "KEYPAD_OVER", 325 .flags = IORESOURCE_IRQ, 326 }, 327 }; 328 329 static const struct mfd_cell stmpe_keypad_cell = { 330 .name = "stmpe-keypad", 331 .of_compatible = "st,stmpe-keypad", 332 .resources = stmpe_keypad_resources, 333 .num_resources = ARRAY_SIZE(stmpe_keypad_resources), 334 }; 335 336 /* 337 * STMPE801 338 */ 339 static const u8 stmpe801_regs[] = { 340 [STMPE_IDX_CHIP_ID] = STMPE801_REG_CHIP_ID, 341 [STMPE_IDX_ICR_LSB] = STMPE801_REG_SYS_CTRL, 342 [STMPE_IDX_GPMR_LSB] = STMPE801_REG_GPIO_MP_STA, 343 [STMPE_IDX_GPSR_LSB] = STMPE801_REG_GPIO_SET_PIN, 344 [STMPE_IDX_GPCR_LSB] = STMPE801_REG_GPIO_SET_PIN, 345 [STMPE_IDX_GPDR_LSB] = STMPE801_REG_GPIO_DIR, 346 [STMPE_IDX_IEGPIOR_LSB] = STMPE801_REG_GPIO_INT_EN, 347 [STMPE_IDX_ISGPIOR_MSB] = STMPE801_REG_GPIO_INT_STA, 348 349 }; 350 351 static struct stmpe_variant_block stmpe801_blocks[] = { 352 { 353 .cell = &stmpe_gpio_cell, 354 .irq = 0, 355 .block = STMPE_BLOCK_GPIO, 356 }, 357 }; 358 359 static struct stmpe_variant_block stmpe801_blocks_noirq[] = { 360 { 361 .cell = &stmpe_gpio_cell_noirq, 362 .block = STMPE_BLOCK_GPIO, 363 }, 364 }; 365 366 static int stmpe801_enable(struct stmpe *stmpe, unsigned int blocks, 367 bool enable) 368 { 369 if (blocks & STMPE_BLOCK_GPIO) 370 return 0; 371 else 372 return -EINVAL; 373 } 374 375 static struct stmpe_variant_info stmpe801 = { 376 .name = "stmpe801", 377 .id_val = STMPE801_ID, 378 .id_mask = 0xffff, 379 .num_gpios = 8, 380 .regs = stmpe801_regs, 381 .blocks = stmpe801_blocks, 382 .num_blocks = ARRAY_SIZE(stmpe801_blocks), 383 .num_irqs = STMPE801_NR_INTERNAL_IRQS, 384 .enable = stmpe801_enable, 385 }; 386 387 static struct stmpe_variant_info stmpe801_noirq = { 388 .name = "stmpe801", 389 .id_val = STMPE801_ID, 390 .id_mask = 0xffff, 391 .num_gpios = 8, 392 .regs = stmpe801_regs, 393 .blocks = stmpe801_blocks_noirq, 394 .num_blocks = ARRAY_SIZE(stmpe801_blocks_noirq), 395 .enable = stmpe801_enable, 396 }; 397 398 /* 399 * Touchscreen (STMPE811 or STMPE610) 400 */ 401 402 static struct resource stmpe_ts_resources[] = { 403 { 404 .name = "TOUCH_DET", 405 .flags = IORESOURCE_IRQ, 406 }, 407 { 408 .name = "FIFO_TH", 409 .flags = IORESOURCE_IRQ, 410 }, 411 }; 412 413 static const struct mfd_cell stmpe_ts_cell = { 414 .name = "stmpe-ts", 415 .of_compatible = "st,stmpe-ts", 416 .resources = stmpe_ts_resources, 417 .num_resources = ARRAY_SIZE(stmpe_ts_resources), 418 }; 419 420 /* 421 * STMPE811 or STMPE610 422 */ 423 424 static const u8 stmpe811_regs[] = { 425 [STMPE_IDX_CHIP_ID] = STMPE811_REG_CHIP_ID, 426 [STMPE_IDX_ICR_LSB] = STMPE811_REG_INT_CTRL, 427 [STMPE_IDX_IER_LSB] = STMPE811_REG_INT_EN, 428 [STMPE_IDX_ISR_MSB] = STMPE811_REG_INT_STA, 429 [STMPE_IDX_GPMR_LSB] = STMPE811_REG_GPIO_MP_STA, 430 [STMPE_IDX_GPSR_LSB] = STMPE811_REG_GPIO_SET_PIN, 431 [STMPE_IDX_GPCR_LSB] = STMPE811_REG_GPIO_CLR_PIN, 432 [STMPE_IDX_GPDR_LSB] = STMPE811_REG_GPIO_DIR, 433 [STMPE_IDX_GPRER_LSB] = STMPE811_REG_GPIO_RE, 434 [STMPE_IDX_GPFER_LSB] = STMPE811_REG_GPIO_FE, 435 [STMPE_IDX_GPAFR_U_MSB] = STMPE811_REG_GPIO_AF, 436 [STMPE_IDX_IEGPIOR_LSB] = STMPE811_REG_GPIO_INT_EN, 437 [STMPE_IDX_ISGPIOR_MSB] = STMPE811_REG_GPIO_INT_STA, 438 [STMPE_IDX_GPEDR_MSB] = STMPE811_REG_GPIO_ED, 439 }; 440 441 static struct stmpe_variant_block stmpe811_blocks[] = { 442 { 443 .cell = &stmpe_gpio_cell, 444 .irq = STMPE811_IRQ_GPIOC, 445 .block = STMPE_BLOCK_GPIO, 446 }, 447 { 448 .cell = &stmpe_ts_cell, 449 .irq = STMPE811_IRQ_TOUCH_DET, 450 .block = STMPE_BLOCK_TOUCHSCREEN, 451 }, 452 }; 453 454 static int stmpe811_enable(struct stmpe *stmpe, unsigned int blocks, 455 bool enable) 456 { 457 unsigned int mask = 0; 458 459 if (blocks & STMPE_BLOCK_GPIO) 460 mask |= STMPE811_SYS_CTRL2_GPIO_OFF; 461 462 if (blocks & STMPE_BLOCK_ADC) 463 mask |= STMPE811_SYS_CTRL2_ADC_OFF; 464 465 if (blocks & STMPE_BLOCK_TOUCHSCREEN) 466 mask |= STMPE811_SYS_CTRL2_TSC_OFF; 467 468 return __stmpe_set_bits(stmpe, STMPE811_REG_SYS_CTRL2, mask, 469 enable ? 0 : mask); 470 } 471 472 static int stmpe811_get_altfunc(struct stmpe *stmpe, enum stmpe_block block) 473 { 474 /* 0 for touchscreen, 1 for GPIO */ 475 return block != STMPE_BLOCK_TOUCHSCREEN; 476 } 477 478 static struct stmpe_variant_info stmpe811 = { 479 .name = "stmpe811", 480 .id_val = 0x0811, 481 .id_mask = 0xffff, 482 .num_gpios = 8, 483 .af_bits = 1, 484 .regs = stmpe811_regs, 485 .blocks = stmpe811_blocks, 486 .num_blocks = ARRAY_SIZE(stmpe811_blocks), 487 .num_irqs = STMPE811_NR_INTERNAL_IRQS, 488 .enable = stmpe811_enable, 489 .get_altfunc = stmpe811_get_altfunc, 490 }; 491 492 /* Similar to 811, except number of gpios */ 493 static struct stmpe_variant_info stmpe610 = { 494 .name = "stmpe610", 495 .id_val = 0x0811, 496 .id_mask = 0xffff, 497 .num_gpios = 6, 498 .af_bits = 1, 499 .regs = stmpe811_regs, 500 .blocks = stmpe811_blocks, 501 .num_blocks = ARRAY_SIZE(stmpe811_blocks), 502 .num_irqs = STMPE811_NR_INTERNAL_IRQS, 503 .enable = stmpe811_enable, 504 .get_altfunc = stmpe811_get_altfunc, 505 }; 506 507 /* 508 * STMPE1601 509 */ 510 511 static const u8 stmpe1601_regs[] = { 512 [STMPE_IDX_CHIP_ID] = STMPE1601_REG_CHIP_ID, 513 [STMPE_IDX_ICR_LSB] = STMPE1601_REG_ICR_LSB, 514 [STMPE_IDX_IER_LSB] = STMPE1601_REG_IER_LSB, 515 [STMPE_IDX_ISR_MSB] = STMPE1601_REG_ISR_MSB, 516 [STMPE_IDX_GPMR_LSB] = STMPE1601_REG_GPIO_MP_LSB, 517 [STMPE_IDX_GPSR_LSB] = STMPE1601_REG_GPIO_SET_LSB, 518 [STMPE_IDX_GPCR_LSB] = STMPE1601_REG_GPIO_CLR_LSB, 519 [STMPE_IDX_GPDR_LSB] = STMPE1601_REG_GPIO_SET_DIR_LSB, 520 [STMPE_IDX_GPRER_LSB] = STMPE1601_REG_GPIO_RE_LSB, 521 [STMPE_IDX_GPFER_LSB] = STMPE1601_REG_GPIO_FE_LSB, 522 [STMPE_IDX_GPPUR_LSB] = STMPE1601_REG_GPIO_PU_LSB, 523 [STMPE_IDX_GPAFR_U_MSB] = STMPE1601_REG_GPIO_AF_U_MSB, 524 [STMPE_IDX_IEGPIOR_LSB] = STMPE1601_REG_INT_EN_GPIO_MASK_LSB, 525 [STMPE_IDX_ISGPIOR_MSB] = STMPE1601_REG_INT_STA_GPIO_MSB, 526 [STMPE_IDX_GPEDR_MSB] = STMPE1601_REG_GPIO_ED_MSB, 527 }; 528 529 static struct stmpe_variant_block stmpe1601_blocks[] = { 530 { 531 .cell = &stmpe_gpio_cell, 532 .irq = STMPE1601_IRQ_GPIOC, 533 .block = STMPE_BLOCK_GPIO, 534 }, 535 { 536 .cell = &stmpe_keypad_cell, 537 .irq = STMPE1601_IRQ_KEYPAD, 538 .block = STMPE_BLOCK_KEYPAD, 539 }, 540 }; 541 542 /* supported autosleep timeout delay (in msecs) */ 543 static const int stmpe_autosleep_delay[] = { 544 4, 16, 32, 64, 128, 256, 512, 1024, 545 }; 546 547 static int stmpe_round_timeout(int timeout) 548 { 549 int i; 550 551 for (i = 0; i < ARRAY_SIZE(stmpe_autosleep_delay); i++) { 552 if (stmpe_autosleep_delay[i] >= timeout) 553 return i; 554 } 555 556 /* 557 * requests for delays longer than supported should not return the 558 * longest supported delay 559 */ 560 return -EINVAL; 561 } 562 563 static int stmpe_autosleep(struct stmpe *stmpe, int autosleep_timeout) 564 { 565 int ret; 566 567 if (!stmpe->variant->enable_autosleep) 568 return -ENOSYS; 569 570 mutex_lock(&stmpe->lock); 571 ret = stmpe->variant->enable_autosleep(stmpe, autosleep_timeout); 572 mutex_unlock(&stmpe->lock); 573 574 return ret; 575 } 576 577 /* 578 * Both stmpe 1601/2403 support same layout for autosleep 579 */ 580 static int stmpe1601_autosleep(struct stmpe *stmpe, 581 int autosleep_timeout) 582 { 583 int ret, timeout; 584 585 /* choose the best available timeout */ 586 timeout = stmpe_round_timeout(autosleep_timeout); 587 if (timeout < 0) { 588 dev_err(stmpe->dev, "invalid timeout\n"); 589 return timeout; 590 } 591 592 ret = __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL2, 593 STMPE1601_AUTOSLEEP_TIMEOUT_MASK, 594 timeout); 595 if (ret < 0) 596 return ret; 597 598 return __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL2, 599 STPME1601_AUTOSLEEP_ENABLE, 600 STPME1601_AUTOSLEEP_ENABLE); 601 } 602 603 static int stmpe1601_enable(struct stmpe *stmpe, unsigned int blocks, 604 bool enable) 605 { 606 unsigned int mask = 0; 607 608 if (blocks & STMPE_BLOCK_GPIO) 609 mask |= STMPE1601_SYS_CTRL_ENABLE_GPIO; 610 else 611 mask &= ~STMPE1601_SYS_CTRL_ENABLE_GPIO; 612 613 if (blocks & STMPE_BLOCK_KEYPAD) 614 mask |= STMPE1601_SYS_CTRL_ENABLE_KPC; 615 else 616 mask &= ~STMPE1601_SYS_CTRL_ENABLE_KPC; 617 618 if (blocks & STMPE_BLOCK_PWM) 619 mask |= STMPE1601_SYS_CTRL_ENABLE_SPWM; 620 else 621 mask &= ~STMPE1601_SYS_CTRL_ENABLE_SPWM; 622 623 return __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL, mask, 624 enable ? mask : 0); 625 } 626 627 static int stmpe1601_get_altfunc(struct stmpe *stmpe, enum stmpe_block block) 628 { 629 switch (block) { 630 case STMPE_BLOCK_PWM: 631 return 2; 632 633 case STMPE_BLOCK_KEYPAD: 634 return 1; 635 636 case STMPE_BLOCK_GPIO: 637 default: 638 return 0; 639 } 640 } 641 642 static struct stmpe_variant_info stmpe1601 = { 643 .name = "stmpe1601", 644 .id_val = 0x0210, 645 .id_mask = 0xfff0, /* at least 0x0210 and 0x0212 */ 646 .num_gpios = 16, 647 .af_bits = 2, 648 .regs = stmpe1601_regs, 649 .blocks = stmpe1601_blocks, 650 .num_blocks = ARRAY_SIZE(stmpe1601_blocks), 651 .num_irqs = STMPE1601_NR_INTERNAL_IRQS, 652 .enable = stmpe1601_enable, 653 .get_altfunc = stmpe1601_get_altfunc, 654 .enable_autosleep = stmpe1601_autosleep, 655 }; 656 657 /* 658 * STMPE1801 659 */ 660 static const u8 stmpe1801_regs[] = { 661 [STMPE_IDX_CHIP_ID] = STMPE1801_REG_CHIP_ID, 662 [STMPE_IDX_ICR_LSB] = STMPE1801_REG_INT_CTRL_LOW, 663 [STMPE_IDX_IER_LSB] = STMPE1801_REG_INT_EN_MASK_LOW, 664 [STMPE_IDX_ISR_LSB] = STMPE1801_REG_INT_STA_LOW, 665 [STMPE_IDX_GPMR_LSB] = STMPE1801_REG_GPIO_MP_LOW, 666 [STMPE_IDX_GPSR_LSB] = STMPE1801_REG_GPIO_SET_LOW, 667 [STMPE_IDX_GPCR_LSB] = STMPE1801_REG_GPIO_CLR_LOW, 668 [STMPE_IDX_GPDR_LSB] = STMPE1801_REG_GPIO_SET_DIR_LOW, 669 [STMPE_IDX_GPRER_LSB] = STMPE1801_REG_GPIO_RE_LOW, 670 [STMPE_IDX_GPFER_LSB] = STMPE1801_REG_GPIO_FE_LOW, 671 [STMPE_IDX_GPPUR_LSB] = STMPE1801_REG_GPIO_PULL_UP_LOW, 672 [STMPE_IDX_IEGPIOR_LSB] = STMPE1801_REG_INT_EN_GPIO_MASK_LOW, 673 [STMPE_IDX_ISGPIOR_LSB] = STMPE1801_REG_INT_STA_GPIO_LOW, 674 }; 675 676 static struct stmpe_variant_block stmpe1801_blocks[] = { 677 { 678 .cell = &stmpe_gpio_cell, 679 .irq = STMPE1801_IRQ_GPIOC, 680 .block = STMPE_BLOCK_GPIO, 681 }, 682 { 683 .cell = &stmpe_keypad_cell, 684 .irq = STMPE1801_IRQ_KEYPAD, 685 .block = STMPE_BLOCK_KEYPAD, 686 }, 687 }; 688 689 static int stmpe1801_enable(struct stmpe *stmpe, unsigned int blocks, 690 bool enable) 691 { 692 unsigned int mask = 0; 693 if (blocks & STMPE_BLOCK_GPIO) 694 mask |= STMPE1801_MSK_INT_EN_GPIO; 695 696 if (blocks & STMPE_BLOCK_KEYPAD) 697 mask |= STMPE1801_MSK_INT_EN_KPC; 698 699 return __stmpe_set_bits(stmpe, STMPE1801_REG_INT_EN_MASK_LOW, mask, 700 enable ? mask : 0); 701 } 702 703 static int stmpe1801_reset(struct stmpe *stmpe) 704 { 705 unsigned long timeout; 706 int ret = 0; 707 708 ret = __stmpe_set_bits(stmpe, STMPE1801_REG_SYS_CTRL, 709 STMPE1801_MSK_SYS_CTRL_RESET, STMPE1801_MSK_SYS_CTRL_RESET); 710 if (ret < 0) 711 return ret; 712 713 timeout = jiffies + msecs_to_jiffies(100); 714 while (time_before(jiffies, timeout)) { 715 ret = __stmpe_reg_read(stmpe, STMPE1801_REG_SYS_CTRL); 716 if (ret < 0) 717 return ret; 718 if (!(ret & STMPE1801_MSK_SYS_CTRL_RESET)) 719 return 0; 720 usleep_range(100, 200); 721 } 722 return -EIO; 723 } 724 725 static struct stmpe_variant_info stmpe1801 = { 726 .name = "stmpe1801", 727 .id_val = STMPE1801_ID, 728 .id_mask = 0xfff0, 729 .num_gpios = 18, 730 .af_bits = 0, 731 .regs = stmpe1801_regs, 732 .blocks = stmpe1801_blocks, 733 .num_blocks = ARRAY_SIZE(stmpe1801_blocks), 734 .num_irqs = STMPE1801_NR_INTERNAL_IRQS, 735 .enable = stmpe1801_enable, 736 /* stmpe1801 do not have any gpio alternate function */ 737 .get_altfunc = NULL, 738 }; 739 740 /* 741 * STMPE24XX 742 */ 743 744 static const u8 stmpe24xx_regs[] = { 745 [STMPE_IDX_CHIP_ID] = STMPE24XX_REG_CHIP_ID, 746 [STMPE_IDX_ICR_LSB] = STMPE24XX_REG_ICR_LSB, 747 [STMPE_IDX_IER_LSB] = STMPE24XX_REG_IER_LSB, 748 [STMPE_IDX_ISR_MSB] = STMPE24XX_REG_ISR_MSB, 749 [STMPE_IDX_GPMR_LSB] = STMPE24XX_REG_GPMR_LSB, 750 [STMPE_IDX_GPSR_LSB] = STMPE24XX_REG_GPSR_LSB, 751 [STMPE_IDX_GPCR_LSB] = STMPE24XX_REG_GPCR_LSB, 752 [STMPE_IDX_GPDR_LSB] = STMPE24XX_REG_GPDR_LSB, 753 [STMPE_IDX_GPRER_LSB] = STMPE24XX_REG_GPRER_LSB, 754 [STMPE_IDX_GPFER_LSB] = STMPE24XX_REG_GPFER_LSB, 755 [STMPE_IDX_GPPUR_LSB] = STMPE24XX_REG_GPPUR_LSB, 756 [STMPE_IDX_GPPDR_LSB] = STMPE24XX_REG_GPPDR_LSB, 757 [STMPE_IDX_GPAFR_U_MSB] = STMPE24XX_REG_GPAFR_U_MSB, 758 [STMPE_IDX_IEGPIOR_LSB] = STMPE24XX_REG_IEGPIOR_LSB, 759 [STMPE_IDX_ISGPIOR_MSB] = STMPE24XX_REG_ISGPIOR_MSB, 760 [STMPE_IDX_GPEDR_MSB] = STMPE24XX_REG_GPEDR_MSB, 761 }; 762 763 static struct stmpe_variant_block stmpe24xx_blocks[] = { 764 { 765 .cell = &stmpe_gpio_cell, 766 .irq = STMPE24XX_IRQ_GPIOC, 767 .block = STMPE_BLOCK_GPIO, 768 }, 769 { 770 .cell = &stmpe_keypad_cell, 771 .irq = STMPE24XX_IRQ_KEYPAD, 772 .block = STMPE_BLOCK_KEYPAD, 773 }, 774 }; 775 776 static int stmpe24xx_enable(struct stmpe *stmpe, unsigned int blocks, 777 bool enable) 778 { 779 unsigned int mask = 0; 780 781 if (blocks & STMPE_BLOCK_GPIO) 782 mask |= STMPE24XX_SYS_CTRL_ENABLE_GPIO; 783 784 if (blocks & STMPE_BLOCK_KEYPAD) 785 mask |= STMPE24XX_SYS_CTRL_ENABLE_KPC; 786 787 return __stmpe_set_bits(stmpe, STMPE24XX_REG_SYS_CTRL, mask, 788 enable ? mask : 0); 789 } 790 791 static int stmpe24xx_get_altfunc(struct stmpe *stmpe, enum stmpe_block block) 792 { 793 switch (block) { 794 case STMPE_BLOCK_ROTATOR: 795 return 2; 796 797 case STMPE_BLOCK_KEYPAD: 798 return 1; 799 800 case STMPE_BLOCK_GPIO: 801 default: 802 return 0; 803 } 804 } 805 806 static struct stmpe_variant_info stmpe2401 = { 807 .name = "stmpe2401", 808 .id_val = 0x0101, 809 .id_mask = 0xffff, 810 .num_gpios = 24, 811 .af_bits = 2, 812 .regs = stmpe24xx_regs, 813 .blocks = stmpe24xx_blocks, 814 .num_blocks = ARRAY_SIZE(stmpe24xx_blocks), 815 .num_irqs = STMPE24XX_NR_INTERNAL_IRQS, 816 .enable = stmpe24xx_enable, 817 .get_altfunc = stmpe24xx_get_altfunc, 818 }; 819 820 static struct stmpe_variant_info stmpe2403 = { 821 .name = "stmpe2403", 822 .id_val = 0x0120, 823 .id_mask = 0xffff, 824 .num_gpios = 24, 825 .af_bits = 2, 826 .regs = stmpe24xx_regs, 827 .blocks = stmpe24xx_blocks, 828 .num_blocks = ARRAY_SIZE(stmpe24xx_blocks), 829 .num_irqs = STMPE24XX_NR_INTERNAL_IRQS, 830 .enable = stmpe24xx_enable, 831 .get_altfunc = stmpe24xx_get_altfunc, 832 .enable_autosleep = stmpe1601_autosleep, /* same as stmpe1601 */ 833 }; 834 835 static struct stmpe_variant_info *stmpe_variant_info[STMPE_NBR_PARTS] = { 836 [STMPE610] = &stmpe610, 837 [STMPE801] = &stmpe801, 838 [STMPE811] = &stmpe811, 839 [STMPE1601] = &stmpe1601, 840 [STMPE1801] = &stmpe1801, 841 [STMPE2401] = &stmpe2401, 842 [STMPE2403] = &stmpe2403, 843 }; 844 845 /* 846 * These devices can be connected in a 'no-irq' configuration - the irq pin 847 * is not used and the device cannot interrupt the CPU. Here we only list 848 * devices which support this configuration - the driver will fail probing 849 * for any devices not listed here which are configured in this way. 850 */ 851 static struct stmpe_variant_info *stmpe_noirq_variant_info[STMPE_NBR_PARTS] = { 852 [STMPE801] = &stmpe801_noirq, 853 }; 854 855 static irqreturn_t stmpe_irq(int irq, void *data) 856 { 857 struct stmpe *stmpe = data; 858 struct stmpe_variant_info *variant = stmpe->variant; 859 int num = DIV_ROUND_UP(variant->num_irqs, 8); 860 u8 israddr; 861 u8 isr[3]; 862 int ret; 863 int i; 864 865 if (variant->id_val == STMPE801_ID) { 866 int base = irq_create_mapping(stmpe->domain, 0); 867 868 handle_nested_irq(base); 869 return IRQ_HANDLED; 870 } 871 872 if (variant->id_val == STMPE1801_ID) 873 israddr = stmpe->regs[STMPE_IDX_ISR_LSB]; 874 else 875 israddr = stmpe->regs[STMPE_IDX_ISR_MSB]; 876 877 ret = stmpe_block_read(stmpe, israddr, num, isr); 878 if (ret < 0) 879 return IRQ_NONE; 880 881 for (i = 0; i < num; i++) { 882 int bank = num - i - 1; 883 u8 status = isr[i]; 884 u8 clear; 885 886 status &= stmpe->ier[bank]; 887 if (!status) 888 continue; 889 890 clear = status; 891 while (status) { 892 int bit = __ffs(status); 893 int line = bank * 8 + bit; 894 int nestedirq = irq_create_mapping(stmpe->domain, line); 895 896 handle_nested_irq(nestedirq); 897 status &= ~(1 << bit); 898 } 899 900 stmpe_reg_write(stmpe, israddr + i, clear); 901 } 902 903 return IRQ_HANDLED; 904 } 905 906 static void stmpe_irq_lock(struct irq_data *data) 907 { 908 struct stmpe *stmpe = irq_data_get_irq_chip_data(data); 909 910 mutex_lock(&stmpe->irq_lock); 911 } 912 913 static void stmpe_irq_sync_unlock(struct irq_data *data) 914 { 915 struct stmpe *stmpe = irq_data_get_irq_chip_data(data); 916 struct stmpe_variant_info *variant = stmpe->variant; 917 int num = DIV_ROUND_UP(variant->num_irqs, 8); 918 int i; 919 920 for (i = 0; i < num; i++) { 921 u8 new = stmpe->ier[i]; 922 u8 old = stmpe->oldier[i]; 923 924 if (new == old) 925 continue; 926 927 stmpe->oldier[i] = new; 928 stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_IER_LSB] - i, new); 929 } 930 931 mutex_unlock(&stmpe->irq_lock); 932 } 933 934 static void stmpe_irq_mask(struct irq_data *data) 935 { 936 struct stmpe *stmpe = irq_data_get_irq_chip_data(data); 937 int offset = data->hwirq; 938 int regoffset = offset / 8; 939 int mask = 1 << (offset % 8); 940 941 stmpe->ier[regoffset] &= ~mask; 942 } 943 944 static void stmpe_irq_unmask(struct irq_data *data) 945 { 946 struct stmpe *stmpe = irq_data_get_irq_chip_data(data); 947 int offset = data->hwirq; 948 int regoffset = offset / 8; 949 int mask = 1 << (offset % 8); 950 951 stmpe->ier[regoffset] |= mask; 952 } 953 954 static struct irq_chip stmpe_irq_chip = { 955 .name = "stmpe", 956 .irq_bus_lock = stmpe_irq_lock, 957 .irq_bus_sync_unlock = stmpe_irq_sync_unlock, 958 .irq_mask = stmpe_irq_mask, 959 .irq_unmask = stmpe_irq_unmask, 960 }; 961 962 static int stmpe_irq_map(struct irq_domain *d, unsigned int virq, 963 irq_hw_number_t hwirq) 964 { 965 struct stmpe *stmpe = d->host_data; 966 struct irq_chip *chip = NULL; 967 968 if (stmpe->variant->id_val != STMPE801_ID) 969 chip = &stmpe_irq_chip; 970 971 irq_set_chip_data(virq, stmpe); 972 irq_set_chip_and_handler(virq, chip, handle_edge_irq); 973 irq_set_nested_thread(virq, 1); 974 #ifdef CONFIG_ARM 975 set_irq_flags(virq, IRQF_VALID); 976 #else 977 irq_set_noprobe(virq); 978 #endif 979 980 return 0; 981 } 982 983 static void stmpe_irq_unmap(struct irq_domain *d, unsigned int virq) 984 { 985 #ifdef CONFIG_ARM 986 set_irq_flags(virq, 0); 987 #endif 988 irq_set_chip_and_handler(virq, NULL, NULL); 989 irq_set_chip_data(virq, NULL); 990 } 991 992 static struct irq_domain_ops stmpe_irq_ops = { 993 .map = stmpe_irq_map, 994 .unmap = stmpe_irq_unmap, 995 .xlate = irq_domain_xlate_twocell, 996 }; 997 998 static int stmpe_irq_init(struct stmpe *stmpe, struct device_node *np) 999 { 1000 int base = 0; 1001 int num_irqs = stmpe->variant->num_irqs; 1002 1003 stmpe->domain = irq_domain_add_simple(np, num_irqs, base, 1004 &stmpe_irq_ops, stmpe); 1005 if (!stmpe->domain) { 1006 dev_err(stmpe->dev, "Failed to create irqdomain\n"); 1007 return -ENOSYS; 1008 } 1009 1010 return 0; 1011 } 1012 1013 static int stmpe_chip_init(struct stmpe *stmpe) 1014 { 1015 unsigned int irq_trigger = stmpe->pdata->irq_trigger; 1016 int autosleep_timeout = stmpe->pdata->autosleep_timeout; 1017 struct stmpe_variant_info *variant = stmpe->variant; 1018 u8 icr = 0; 1019 unsigned int id; 1020 u8 data[2]; 1021 int ret; 1022 1023 ret = stmpe_block_read(stmpe, stmpe->regs[STMPE_IDX_CHIP_ID], 1024 ARRAY_SIZE(data), data); 1025 if (ret < 0) 1026 return ret; 1027 1028 id = (data[0] << 8) | data[1]; 1029 if ((id & variant->id_mask) != variant->id_val) { 1030 dev_err(stmpe->dev, "unknown chip id: %#x\n", id); 1031 return -EINVAL; 1032 } 1033 1034 dev_info(stmpe->dev, "%s detected, chip id: %#x\n", variant->name, id); 1035 1036 /* Disable all modules -- subdrivers should enable what they need. */ 1037 ret = stmpe_disable(stmpe, ~0); 1038 if (ret) 1039 return ret; 1040 1041 if (id == STMPE1801_ID) { 1042 ret = stmpe1801_reset(stmpe); 1043 if (ret < 0) 1044 return ret; 1045 } 1046 1047 if (stmpe->irq >= 0) { 1048 if (id == STMPE801_ID) 1049 icr = STMPE801_REG_SYS_CTRL_INT_EN; 1050 else 1051 icr = STMPE_ICR_LSB_GIM; 1052 1053 /* STMPE801 doesn't support Edge interrupts */ 1054 if (id != STMPE801_ID) { 1055 if (irq_trigger == IRQF_TRIGGER_FALLING || 1056 irq_trigger == IRQF_TRIGGER_RISING) 1057 icr |= STMPE_ICR_LSB_EDGE; 1058 } 1059 1060 if (irq_trigger == IRQF_TRIGGER_RISING || 1061 irq_trigger == IRQF_TRIGGER_HIGH) { 1062 if (id == STMPE801_ID) 1063 icr |= STMPE801_REG_SYS_CTRL_INT_HI; 1064 else 1065 icr |= STMPE_ICR_LSB_HIGH; 1066 } 1067 } 1068 1069 if (stmpe->pdata->autosleep) { 1070 ret = stmpe_autosleep(stmpe, autosleep_timeout); 1071 if (ret) 1072 return ret; 1073 } 1074 1075 return stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_ICR_LSB], icr); 1076 } 1077 1078 static int stmpe_add_device(struct stmpe *stmpe, const struct mfd_cell *cell) 1079 { 1080 return mfd_add_devices(stmpe->dev, stmpe->pdata->id, cell, 1, 1081 NULL, 0, stmpe->domain); 1082 } 1083 1084 static int stmpe_devices_init(struct stmpe *stmpe) 1085 { 1086 struct stmpe_variant_info *variant = stmpe->variant; 1087 unsigned int platform_blocks = stmpe->pdata->blocks; 1088 int ret = -EINVAL; 1089 int i, j; 1090 1091 for (i = 0; i < variant->num_blocks; i++) { 1092 struct stmpe_variant_block *block = &variant->blocks[i]; 1093 1094 if (!(platform_blocks & block->block)) 1095 continue; 1096 1097 for (j = 0; j < block->cell->num_resources; j++) { 1098 struct resource *res = 1099 (struct resource *) &block->cell->resources[j]; 1100 1101 /* Dynamically fill in a variant's IRQ. */ 1102 if (res->flags & IORESOURCE_IRQ) 1103 res->start = res->end = block->irq + j; 1104 } 1105 1106 platform_blocks &= ~block->block; 1107 ret = stmpe_add_device(stmpe, block->cell); 1108 if (ret) 1109 return ret; 1110 } 1111 1112 if (platform_blocks) 1113 dev_warn(stmpe->dev, 1114 "platform wants blocks (%#x) not present on variant", 1115 platform_blocks); 1116 1117 return ret; 1118 } 1119 1120 static void stmpe_of_probe(struct stmpe_platform_data *pdata, 1121 struct device_node *np) 1122 { 1123 struct device_node *child; 1124 1125 pdata->id = of_alias_get_id(np, "stmpe-i2c"); 1126 if (pdata->id < 0) 1127 pdata->id = -1; 1128 1129 pdata->irq_gpio = of_get_named_gpio_flags(np, "irq-gpio", 0, 1130 &pdata->irq_trigger); 1131 if (gpio_is_valid(pdata->irq_gpio)) 1132 pdata->irq_over_gpio = 1; 1133 else 1134 pdata->irq_trigger = IRQF_TRIGGER_NONE; 1135 1136 of_property_read_u32(np, "st,autosleep-timeout", 1137 &pdata->autosleep_timeout); 1138 1139 pdata->autosleep = (pdata->autosleep_timeout) ? true : false; 1140 1141 for_each_child_of_node(np, child) { 1142 if (!strcmp(child->name, "stmpe_gpio")) { 1143 pdata->blocks |= STMPE_BLOCK_GPIO; 1144 } else if (!strcmp(child->name, "stmpe_keypad")) { 1145 pdata->blocks |= STMPE_BLOCK_KEYPAD; 1146 } else if (!strcmp(child->name, "stmpe_touchscreen")) { 1147 pdata->blocks |= STMPE_BLOCK_TOUCHSCREEN; 1148 } else if (!strcmp(child->name, "stmpe_adc")) { 1149 pdata->blocks |= STMPE_BLOCK_ADC; 1150 } else if (!strcmp(child->name, "stmpe_pwm")) { 1151 pdata->blocks |= STMPE_BLOCK_PWM; 1152 } else if (!strcmp(child->name, "stmpe_rotator")) { 1153 pdata->blocks |= STMPE_BLOCK_ROTATOR; 1154 } 1155 } 1156 } 1157 1158 /* Called from client specific probe routines */ 1159 int stmpe_probe(struct stmpe_client_info *ci, enum stmpe_partnum partnum) 1160 { 1161 struct stmpe_platform_data *pdata = dev_get_platdata(ci->dev); 1162 struct device_node *np = ci->dev->of_node; 1163 struct stmpe *stmpe; 1164 int ret; 1165 1166 if (!pdata) { 1167 if (!np) 1168 return -EINVAL; 1169 1170 pdata = devm_kzalloc(ci->dev, sizeof(*pdata), GFP_KERNEL); 1171 if (!pdata) 1172 return -ENOMEM; 1173 1174 stmpe_of_probe(pdata, np); 1175 1176 if (of_find_property(np, "interrupts", NULL) == NULL) 1177 ci->irq = -1; 1178 } 1179 1180 stmpe = devm_kzalloc(ci->dev, sizeof(struct stmpe), GFP_KERNEL); 1181 if (!stmpe) 1182 return -ENOMEM; 1183 1184 mutex_init(&stmpe->irq_lock); 1185 mutex_init(&stmpe->lock); 1186 1187 stmpe->dev = ci->dev; 1188 stmpe->client = ci->client; 1189 stmpe->pdata = pdata; 1190 stmpe->ci = ci; 1191 stmpe->partnum = partnum; 1192 stmpe->variant = stmpe_variant_info[partnum]; 1193 stmpe->regs = stmpe->variant->regs; 1194 stmpe->num_gpios = stmpe->variant->num_gpios; 1195 stmpe->vcc = devm_regulator_get_optional(ci->dev, "vcc"); 1196 if (!IS_ERR(stmpe->vcc)) { 1197 ret = regulator_enable(stmpe->vcc); 1198 if (ret) 1199 dev_warn(ci->dev, "failed to enable VCC supply\n"); 1200 } 1201 stmpe->vio = devm_regulator_get_optional(ci->dev, "vio"); 1202 if (!IS_ERR(stmpe->vio)) { 1203 ret = regulator_enable(stmpe->vio); 1204 if (ret) 1205 dev_warn(ci->dev, "failed to enable VIO supply\n"); 1206 } 1207 dev_set_drvdata(stmpe->dev, stmpe); 1208 1209 if (ci->init) 1210 ci->init(stmpe); 1211 1212 if (pdata->irq_over_gpio) { 1213 ret = devm_gpio_request_one(ci->dev, pdata->irq_gpio, 1214 GPIOF_DIR_IN, "stmpe"); 1215 if (ret) { 1216 dev_err(stmpe->dev, "failed to request IRQ GPIO: %d\n", 1217 ret); 1218 return ret; 1219 } 1220 1221 stmpe->irq = gpio_to_irq(pdata->irq_gpio); 1222 } else { 1223 stmpe->irq = ci->irq; 1224 } 1225 1226 if (stmpe->irq < 0) { 1227 /* use alternate variant info for no-irq mode, if supported */ 1228 dev_info(stmpe->dev, 1229 "%s configured in no-irq mode by platform data\n", 1230 stmpe->variant->name); 1231 if (!stmpe_noirq_variant_info[stmpe->partnum]) { 1232 dev_err(stmpe->dev, 1233 "%s does not support no-irq mode!\n", 1234 stmpe->variant->name); 1235 return -ENODEV; 1236 } 1237 stmpe->variant = stmpe_noirq_variant_info[stmpe->partnum]; 1238 } else if (pdata->irq_trigger == IRQF_TRIGGER_NONE) { 1239 pdata->irq_trigger = irq_get_trigger_type(stmpe->irq); 1240 } 1241 1242 ret = stmpe_chip_init(stmpe); 1243 if (ret) 1244 return ret; 1245 1246 if (stmpe->irq >= 0) { 1247 ret = stmpe_irq_init(stmpe, np); 1248 if (ret) 1249 return ret; 1250 1251 ret = devm_request_threaded_irq(ci->dev, stmpe->irq, NULL, 1252 stmpe_irq, pdata->irq_trigger | IRQF_ONESHOT, 1253 "stmpe", stmpe); 1254 if (ret) { 1255 dev_err(stmpe->dev, "failed to request IRQ: %d\n", 1256 ret); 1257 return ret; 1258 } 1259 } 1260 1261 ret = stmpe_devices_init(stmpe); 1262 if (!ret) 1263 return 0; 1264 1265 dev_err(stmpe->dev, "failed to add children\n"); 1266 mfd_remove_devices(stmpe->dev); 1267 1268 return ret; 1269 } 1270 1271 int stmpe_remove(struct stmpe *stmpe) 1272 { 1273 if (!IS_ERR(stmpe->vio)) 1274 regulator_disable(stmpe->vio); 1275 if (!IS_ERR(stmpe->vcc)) 1276 regulator_disable(stmpe->vcc); 1277 1278 mfd_remove_devices(stmpe->dev); 1279 1280 return 0; 1281 } 1282 1283 #ifdef CONFIG_PM 1284 static int stmpe_suspend(struct device *dev) 1285 { 1286 struct stmpe *stmpe = dev_get_drvdata(dev); 1287 1288 if (stmpe->irq >= 0 && device_may_wakeup(dev)) 1289 enable_irq_wake(stmpe->irq); 1290 1291 return 0; 1292 } 1293 1294 static int stmpe_resume(struct device *dev) 1295 { 1296 struct stmpe *stmpe = dev_get_drvdata(dev); 1297 1298 if (stmpe->irq >= 0 && device_may_wakeup(dev)) 1299 disable_irq_wake(stmpe->irq); 1300 1301 return 0; 1302 } 1303 1304 const struct dev_pm_ops stmpe_dev_pm_ops = { 1305 .suspend = stmpe_suspend, 1306 .resume = stmpe_resume, 1307 }; 1308 #endif 1309