1 /* 2 * Copyright (C) ST-Ericsson SA 2010 3 * 4 * License Terms: GNU General Public License, version 2 5 * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson 6 */ 7 8 #include <linux/gpio.h> 9 #include <linux/kernel.h> 10 #include <linux/module.h> 11 #include <linux/interrupt.h> 12 #include <linux/irq.h> 13 #include <linux/slab.h> 14 #include <linux/i2c.h> 15 #include <linux/mfd/core.h> 16 #include <linux/mfd/stmpe.h> 17 #include "stmpe.h" 18 19 static int __stmpe_enable(struct stmpe *stmpe, unsigned int blocks) 20 { 21 return stmpe->variant->enable(stmpe, blocks, true); 22 } 23 24 static int __stmpe_disable(struct stmpe *stmpe, unsigned int blocks) 25 { 26 return stmpe->variant->enable(stmpe, blocks, false); 27 } 28 29 static int __stmpe_reg_read(struct stmpe *stmpe, u8 reg) 30 { 31 int ret; 32 33 ret = i2c_smbus_read_byte_data(stmpe->i2c, reg); 34 if (ret < 0) 35 dev_err(stmpe->dev, "failed to read reg %#x: %d\n", 36 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 = i2c_smbus_write_byte_data(stmpe->i2c, reg, val); 50 if (ret < 0) 51 dev_err(stmpe->dev, "failed to write reg %#x: %d\n", 52 reg, ret); 53 54 return ret; 55 } 56 57 static int __stmpe_set_bits(struct stmpe *stmpe, u8 reg, u8 mask, u8 val) 58 { 59 int ret; 60 61 ret = __stmpe_reg_read(stmpe, reg); 62 if (ret < 0) 63 return ret; 64 65 ret &= ~mask; 66 ret |= val; 67 68 return __stmpe_reg_write(stmpe, reg, ret); 69 } 70 71 static int __stmpe_block_read(struct stmpe *stmpe, u8 reg, u8 length, 72 u8 *values) 73 { 74 int ret; 75 76 ret = i2c_smbus_read_i2c_block_data(stmpe->i2c, reg, length, values); 77 if (ret < 0) 78 dev_err(stmpe->dev, "failed to read regs %#x: %d\n", 79 reg, ret); 80 81 dev_vdbg(stmpe->dev, "rd: reg %#x (%d) => ret %#x\n", reg, length, ret); 82 stmpe_dump_bytes("stmpe rd: ", values, length); 83 84 return ret; 85 } 86 87 static int __stmpe_block_write(struct stmpe *stmpe, u8 reg, u8 length, 88 const u8 *values) 89 { 90 int ret; 91 92 dev_vdbg(stmpe->dev, "wr: regs %#x (%d)\n", reg, length); 93 stmpe_dump_bytes("stmpe wr: ", values, length); 94 95 ret = i2c_smbus_write_i2c_block_data(stmpe->i2c, reg, length, 96 values); 97 if (ret < 0) 98 dev_err(stmpe->dev, "failed to write regs %#x: %d\n", 99 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 afperreg = 8 / af_bits; 250 int mask = (1 << af_bits) - 1; 251 u8 regs[numregs]; 252 int af; 253 int ret; 254 255 mutex_lock(&stmpe->lock); 256 257 ret = __stmpe_enable(stmpe, STMPE_BLOCK_GPIO); 258 if (ret < 0) 259 goto out; 260 261 ret = __stmpe_block_read(stmpe, regaddr, numregs, regs); 262 if (ret < 0) 263 goto out; 264 265 af = variant->get_altfunc(stmpe, block); 266 267 while (pins) { 268 int pin = __ffs(pins); 269 int regoffset = numregs - (pin / afperreg) - 1; 270 int pos = (pin % afperreg) * (8 / afperreg); 271 272 regs[regoffset] &= ~(mask << pos); 273 regs[regoffset] |= af << pos; 274 275 pins &= ~(1 << pin); 276 } 277 278 ret = __stmpe_block_write(stmpe, regaddr, numregs, regs); 279 280 out: 281 mutex_unlock(&stmpe->lock); 282 return ret; 283 } 284 EXPORT_SYMBOL_GPL(stmpe_set_altfunc); 285 286 /* 287 * GPIO (all variants) 288 */ 289 290 static struct resource stmpe_gpio_resources[] = { 291 /* Start and end filled dynamically */ 292 { 293 .flags = IORESOURCE_IRQ, 294 }, 295 }; 296 297 static struct mfd_cell stmpe_gpio_cell = { 298 .name = "stmpe-gpio", 299 .resources = stmpe_gpio_resources, 300 .num_resources = ARRAY_SIZE(stmpe_gpio_resources), 301 }; 302 303 /* 304 * Keypad (1601, 2401, 2403) 305 */ 306 307 static struct resource stmpe_keypad_resources[] = { 308 { 309 .name = "KEYPAD", 310 .start = 0, 311 .end = 0, 312 .flags = IORESOURCE_IRQ, 313 }, 314 { 315 .name = "KEYPAD_OVER", 316 .start = 1, 317 .end = 1, 318 .flags = IORESOURCE_IRQ, 319 }, 320 }; 321 322 static struct mfd_cell stmpe_keypad_cell = { 323 .name = "stmpe-keypad", 324 .resources = stmpe_keypad_resources, 325 .num_resources = ARRAY_SIZE(stmpe_keypad_resources), 326 }; 327 328 /* 329 * Touchscreen (STMPE811) 330 */ 331 332 static struct resource stmpe_ts_resources[] = { 333 { 334 .name = "TOUCH_DET", 335 .start = 0, 336 .end = 0, 337 .flags = IORESOURCE_IRQ, 338 }, 339 { 340 .name = "FIFO_TH", 341 .start = 1, 342 .end = 1, 343 .flags = IORESOURCE_IRQ, 344 }, 345 }; 346 347 static struct mfd_cell stmpe_ts_cell = { 348 .name = "stmpe-ts", 349 .resources = stmpe_ts_resources, 350 .num_resources = ARRAY_SIZE(stmpe_ts_resources), 351 }; 352 353 /* 354 * STMPE811 355 */ 356 357 static const u8 stmpe811_regs[] = { 358 [STMPE_IDX_CHIP_ID] = STMPE811_REG_CHIP_ID, 359 [STMPE_IDX_ICR_LSB] = STMPE811_REG_INT_CTRL, 360 [STMPE_IDX_IER_LSB] = STMPE811_REG_INT_EN, 361 [STMPE_IDX_ISR_MSB] = STMPE811_REG_INT_STA, 362 [STMPE_IDX_GPMR_LSB] = STMPE811_REG_GPIO_MP_STA, 363 [STMPE_IDX_GPSR_LSB] = STMPE811_REG_GPIO_SET_PIN, 364 [STMPE_IDX_GPCR_LSB] = STMPE811_REG_GPIO_CLR_PIN, 365 [STMPE_IDX_GPDR_LSB] = STMPE811_REG_GPIO_DIR, 366 [STMPE_IDX_GPRER_LSB] = STMPE811_REG_GPIO_RE, 367 [STMPE_IDX_GPFER_LSB] = STMPE811_REG_GPIO_FE, 368 [STMPE_IDX_GPAFR_U_MSB] = STMPE811_REG_GPIO_AF, 369 [STMPE_IDX_IEGPIOR_LSB] = STMPE811_REG_GPIO_INT_EN, 370 [STMPE_IDX_ISGPIOR_MSB] = STMPE811_REG_GPIO_INT_STA, 371 [STMPE_IDX_GPEDR_MSB] = STMPE811_REG_GPIO_ED, 372 }; 373 374 static struct stmpe_variant_block stmpe811_blocks[] = { 375 { 376 .cell = &stmpe_gpio_cell, 377 .irq = STMPE811_IRQ_GPIOC, 378 .block = STMPE_BLOCK_GPIO, 379 }, 380 { 381 .cell = &stmpe_ts_cell, 382 .irq = STMPE811_IRQ_TOUCH_DET, 383 .block = STMPE_BLOCK_TOUCHSCREEN, 384 }, 385 }; 386 387 static int stmpe811_enable(struct stmpe *stmpe, unsigned int blocks, 388 bool enable) 389 { 390 unsigned int mask = 0; 391 392 if (blocks & STMPE_BLOCK_GPIO) 393 mask |= STMPE811_SYS_CTRL2_GPIO_OFF; 394 395 if (blocks & STMPE_BLOCK_ADC) 396 mask |= STMPE811_SYS_CTRL2_ADC_OFF; 397 398 if (blocks & STMPE_BLOCK_TOUCHSCREEN) 399 mask |= STMPE811_SYS_CTRL2_TSC_OFF; 400 401 return __stmpe_set_bits(stmpe, STMPE811_REG_SYS_CTRL2, mask, 402 enable ? 0 : mask); 403 } 404 405 static int stmpe811_get_altfunc(struct stmpe *stmpe, enum stmpe_block block) 406 { 407 /* 0 for touchscreen, 1 for GPIO */ 408 return block != STMPE_BLOCK_TOUCHSCREEN; 409 } 410 411 static struct stmpe_variant_info stmpe811 = { 412 .name = "stmpe811", 413 .id_val = 0x0811, 414 .id_mask = 0xffff, 415 .num_gpios = 8, 416 .af_bits = 1, 417 .regs = stmpe811_regs, 418 .blocks = stmpe811_blocks, 419 .num_blocks = ARRAY_SIZE(stmpe811_blocks), 420 .num_irqs = STMPE811_NR_INTERNAL_IRQS, 421 .enable = stmpe811_enable, 422 .get_altfunc = stmpe811_get_altfunc, 423 }; 424 425 /* 426 * STMPE1601 427 */ 428 429 static const u8 stmpe1601_regs[] = { 430 [STMPE_IDX_CHIP_ID] = STMPE1601_REG_CHIP_ID, 431 [STMPE_IDX_ICR_LSB] = STMPE1601_REG_ICR_LSB, 432 [STMPE_IDX_IER_LSB] = STMPE1601_REG_IER_LSB, 433 [STMPE_IDX_ISR_MSB] = STMPE1601_REG_ISR_MSB, 434 [STMPE_IDX_GPMR_LSB] = STMPE1601_REG_GPIO_MP_LSB, 435 [STMPE_IDX_GPSR_LSB] = STMPE1601_REG_GPIO_SET_LSB, 436 [STMPE_IDX_GPCR_LSB] = STMPE1601_REG_GPIO_CLR_LSB, 437 [STMPE_IDX_GPDR_LSB] = STMPE1601_REG_GPIO_SET_DIR_LSB, 438 [STMPE_IDX_GPRER_LSB] = STMPE1601_REG_GPIO_RE_LSB, 439 [STMPE_IDX_GPFER_LSB] = STMPE1601_REG_GPIO_FE_LSB, 440 [STMPE_IDX_GPAFR_U_MSB] = STMPE1601_REG_GPIO_AF_U_MSB, 441 [STMPE_IDX_IEGPIOR_LSB] = STMPE1601_REG_INT_EN_GPIO_MASK_LSB, 442 [STMPE_IDX_ISGPIOR_MSB] = STMPE1601_REG_INT_STA_GPIO_MSB, 443 [STMPE_IDX_GPEDR_MSB] = STMPE1601_REG_GPIO_ED_MSB, 444 }; 445 446 static struct stmpe_variant_block stmpe1601_blocks[] = { 447 { 448 .cell = &stmpe_gpio_cell, 449 .irq = STMPE24XX_IRQ_GPIOC, 450 .block = STMPE_BLOCK_GPIO, 451 }, 452 { 453 .cell = &stmpe_keypad_cell, 454 .irq = STMPE24XX_IRQ_KEYPAD, 455 .block = STMPE_BLOCK_KEYPAD, 456 }, 457 }; 458 459 /* supported autosleep timeout delay (in msecs) */ 460 static const int stmpe_autosleep_delay[] = { 461 4, 16, 32, 64, 128, 256, 512, 1024, 462 }; 463 464 static int stmpe_round_timeout(int timeout) 465 { 466 int i; 467 468 for (i = 0; i < ARRAY_SIZE(stmpe_autosleep_delay); i++) { 469 if (stmpe_autosleep_delay[i] >= timeout) 470 return i; 471 } 472 473 /* 474 * requests for delays longer than supported should not return the 475 * longest supported delay 476 */ 477 return -EINVAL; 478 } 479 480 static int stmpe_autosleep(struct stmpe *stmpe, int autosleep_timeout) 481 { 482 int ret; 483 484 if (!stmpe->variant->enable_autosleep) 485 return -ENOSYS; 486 487 mutex_lock(&stmpe->lock); 488 ret = stmpe->variant->enable_autosleep(stmpe, autosleep_timeout); 489 mutex_unlock(&stmpe->lock); 490 491 return ret; 492 } 493 494 /* 495 * Both stmpe 1601/2403 support same layout for autosleep 496 */ 497 static int stmpe1601_autosleep(struct stmpe *stmpe, 498 int autosleep_timeout) 499 { 500 int ret, timeout; 501 502 /* choose the best available timeout */ 503 timeout = stmpe_round_timeout(autosleep_timeout); 504 if (timeout < 0) { 505 dev_err(stmpe->dev, "invalid timeout\n"); 506 return timeout; 507 } 508 509 ret = __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL2, 510 STMPE1601_AUTOSLEEP_TIMEOUT_MASK, 511 timeout); 512 if (ret < 0) 513 return ret; 514 515 return __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL2, 516 STPME1601_AUTOSLEEP_ENABLE, 517 STPME1601_AUTOSLEEP_ENABLE); 518 } 519 520 static int stmpe1601_enable(struct stmpe *stmpe, unsigned int blocks, 521 bool enable) 522 { 523 unsigned int mask = 0; 524 525 if (blocks & STMPE_BLOCK_GPIO) 526 mask |= STMPE1601_SYS_CTRL_ENABLE_GPIO; 527 528 if (blocks & STMPE_BLOCK_KEYPAD) 529 mask |= STMPE1601_SYS_CTRL_ENABLE_KPC; 530 531 return __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL, mask, 532 enable ? mask : 0); 533 } 534 535 static int stmpe1601_get_altfunc(struct stmpe *stmpe, enum stmpe_block block) 536 { 537 switch (block) { 538 case STMPE_BLOCK_PWM: 539 return 2; 540 541 case STMPE_BLOCK_KEYPAD: 542 return 1; 543 544 case STMPE_BLOCK_GPIO: 545 default: 546 return 0; 547 } 548 } 549 550 static struct stmpe_variant_info stmpe1601 = { 551 .name = "stmpe1601", 552 .id_val = 0x0210, 553 .id_mask = 0xfff0, /* at least 0x0210 and 0x0212 */ 554 .num_gpios = 16, 555 .af_bits = 2, 556 .regs = stmpe1601_regs, 557 .blocks = stmpe1601_blocks, 558 .num_blocks = ARRAY_SIZE(stmpe1601_blocks), 559 .num_irqs = STMPE1601_NR_INTERNAL_IRQS, 560 .enable = stmpe1601_enable, 561 .get_altfunc = stmpe1601_get_altfunc, 562 .enable_autosleep = stmpe1601_autosleep, 563 }; 564 565 /* 566 * STMPE24XX 567 */ 568 569 static const u8 stmpe24xx_regs[] = { 570 [STMPE_IDX_CHIP_ID] = STMPE24XX_REG_CHIP_ID, 571 [STMPE_IDX_ICR_LSB] = STMPE24XX_REG_ICR_LSB, 572 [STMPE_IDX_IER_LSB] = STMPE24XX_REG_IER_LSB, 573 [STMPE_IDX_ISR_MSB] = STMPE24XX_REG_ISR_MSB, 574 [STMPE_IDX_GPMR_LSB] = STMPE24XX_REG_GPMR_LSB, 575 [STMPE_IDX_GPSR_LSB] = STMPE24XX_REG_GPSR_LSB, 576 [STMPE_IDX_GPCR_LSB] = STMPE24XX_REG_GPCR_LSB, 577 [STMPE_IDX_GPDR_LSB] = STMPE24XX_REG_GPDR_LSB, 578 [STMPE_IDX_GPRER_LSB] = STMPE24XX_REG_GPRER_LSB, 579 [STMPE_IDX_GPFER_LSB] = STMPE24XX_REG_GPFER_LSB, 580 [STMPE_IDX_GPAFR_U_MSB] = STMPE24XX_REG_GPAFR_U_MSB, 581 [STMPE_IDX_IEGPIOR_LSB] = STMPE24XX_REG_IEGPIOR_LSB, 582 [STMPE_IDX_ISGPIOR_MSB] = STMPE24XX_REG_ISGPIOR_MSB, 583 [STMPE_IDX_GPEDR_MSB] = STMPE24XX_REG_GPEDR_MSB, 584 }; 585 586 static struct stmpe_variant_block stmpe24xx_blocks[] = { 587 { 588 .cell = &stmpe_gpio_cell, 589 .irq = STMPE24XX_IRQ_GPIOC, 590 .block = STMPE_BLOCK_GPIO, 591 }, 592 { 593 .cell = &stmpe_keypad_cell, 594 .irq = STMPE24XX_IRQ_KEYPAD, 595 .block = STMPE_BLOCK_KEYPAD, 596 }, 597 }; 598 599 static int stmpe24xx_enable(struct stmpe *stmpe, unsigned int blocks, 600 bool enable) 601 { 602 unsigned int mask = 0; 603 604 if (blocks & STMPE_BLOCK_GPIO) 605 mask |= STMPE24XX_SYS_CTRL_ENABLE_GPIO; 606 607 if (blocks & STMPE_BLOCK_KEYPAD) 608 mask |= STMPE24XX_SYS_CTRL_ENABLE_KPC; 609 610 return __stmpe_set_bits(stmpe, STMPE24XX_REG_SYS_CTRL, mask, 611 enable ? mask : 0); 612 } 613 614 static int stmpe24xx_get_altfunc(struct stmpe *stmpe, enum stmpe_block block) 615 { 616 switch (block) { 617 case STMPE_BLOCK_ROTATOR: 618 return 2; 619 620 case STMPE_BLOCK_KEYPAD: 621 return 1; 622 623 case STMPE_BLOCK_GPIO: 624 default: 625 return 0; 626 } 627 } 628 629 static struct stmpe_variant_info stmpe2401 = { 630 .name = "stmpe2401", 631 .id_val = 0x0101, 632 .id_mask = 0xffff, 633 .num_gpios = 24, 634 .af_bits = 2, 635 .regs = stmpe24xx_regs, 636 .blocks = stmpe24xx_blocks, 637 .num_blocks = ARRAY_SIZE(stmpe24xx_blocks), 638 .num_irqs = STMPE24XX_NR_INTERNAL_IRQS, 639 .enable = stmpe24xx_enable, 640 .get_altfunc = stmpe24xx_get_altfunc, 641 }; 642 643 static struct stmpe_variant_info stmpe2403 = { 644 .name = "stmpe2403", 645 .id_val = 0x0120, 646 .id_mask = 0xffff, 647 .num_gpios = 24, 648 .af_bits = 2, 649 .regs = stmpe24xx_regs, 650 .blocks = stmpe24xx_blocks, 651 .num_blocks = ARRAY_SIZE(stmpe24xx_blocks), 652 .num_irqs = STMPE24XX_NR_INTERNAL_IRQS, 653 .enable = stmpe24xx_enable, 654 .get_altfunc = stmpe24xx_get_altfunc, 655 .enable_autosleep = stmpe1601_autosleep, /* same as stmpe1601 */ 656 }; 657 658 static struct stmpe_variant_info *stmpe_variant_info[] = { 659 [STMPE811] = &stmpe811, 660 [STMPE1601] = &stmpe1601, 661 [STMPE2401] = &stmpe2401, 662 [STMPE2403] = &stmpe2403, 663 }; 664 665 static irqreturn_t stmpe_irq(int irq, void *data) 666 { 667 struct stmpe *stmpe = data; 668 struct stmpe_variant_info *variant = stmpe->variant; 669 int num = DIV_ROUND_UP(variant->num_irqs, 8); 670 u8 israddr = stmpe->regs[STMPE_IDX_ISR_MSB]; 671 u8 isr[num]; 672 int ret; 673 int i; 674 675 ret = stmpe_block_read(stmpe, israddr, num, isr); 676 if (ret < 0) 677 return IRQ_NONE; 678 679 for (i = 0; i < num; i++) { 680 int bank = num - i - 1; 681 u8 status = isr[i]; 682 u8 clear; 683 684 status &= stmpe->ier[bank]; 685 if (!status) 686 continue; 687 688 clear = status; 689 while (status) { 690 int bit = __ffs(status); 691 int line = bank * 8 + bit; 692 693 handle_nested_irq(stmpe->irq_base + line); 694 status &= ~(1 << bit); 695 } 696 697 stmpe_reg_write(stmpe, israddr + i, clear); 698 } 699 700 return IRQ_HANDLED; 701 } 702 703 static void stmpe_irq_lock(struct irq_data *data) 704 { 705 struct stmpe *stmpe = irq_data_get_irq_chip_data(data); 706 707 mutex_lock(&stmpe->irq_lock); 708 } 709 710 static void stmpe_irq_sync_unlock(struct irq_data *data) 711 { 712 struct stmpe *stmpe = irq_data_get_irq_chip_data(data); 713 struct stmpe_variant_info *variant = stmpe->variant; 714 int num = DIV_ROUND_UP(variant->num_irqs, 8); 715 int i; 716 717 for (i = 0; i < num; i++) { 718 u8 new = stmpe->ier[i]; 719 u8 old = stmpe->oldier[i]; 720 721 if (new == old) 722 continue; 723 724 stmpe->oldier[i] = new; 725 stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_IER_LSB] - i, new); 726 } 727 728 mutex_unlock(&stmpe->irq_lock); 729 } 730 731 static void stmpe_irq_mask(struct irq_data *data) 732 { 733 struct stmpe *stmpe = irq_data_get_irq_chip_data(data); 734 int offset = data->irq - stmpe->irq_base; 735 int regoffset = offset / 8; 736 int mask = 1 << (offset % 8); 737 738 stmpe->ier[regoffset] &= ~mask; 739 } 740 741 static void stmpe_irq_unmask(struct irq_data *data) 742 { 743 struct stmpe *stmpe = irq_data_get_irq_chip_data(data); 744 int offset = data->irq - stmpe->irq_base; 745 int regoffset = offset / 8; 746 int mask = 1 << (offset % 8); 747 748 stmpe->ier[regoffset] |= mask; 749 } 750 751 static struct irq_chip stmpe_irq_chip = { 752 .name = "stmpe", 753 .irq_bus_lock = stmpe_irq_lock, 754 .irq_bus_sync_unlock = stmpe_irq_sync_unlock, 755 .irq_mask = stmpe_irq_mask, 756 .irq_unmask = stmpe_irq_unmask, 757 }; 758 759 static int __devinit stmpe_irq_init(struct stmpe *stmpe) 760 { 761 int num_irqs = stmpe->variant->num_irqs; 762 int base = stmpe->irq_base; 763 int irq; 764 765 for (irq = base; irq < base + num_irqs; irq++) { 766 irq_set_chip_data(irq, stmpe); 767 irq_set_chip_and_handler(irq, &stmpe_irq_chip, 768 handle_edge_irq); 769 irq_set_nested_thread(irq, 1); 770 #ifdef CONFIG_ARM 771 set_irq_flags(irq, IRQF_VALID); 772 #else 773 irq_set_noprobe(irq); 774 #endif 775 } 776 777 return 0; 778 } 779 780 static void stmpe_irq_remove(struct stmpe *stmpe) 781 { 782 int num_irqs = stmpe->variant->num_irqs; 783 int base = stmpe->irq_base; 784 int irq; 785 786 for (irq = base; irq < base + num_irqs; irq++) { 787 #ifdef CONFIG_ARM 788 set_irq_flags(irq, 0); 789 #endif 790 irq_set_chip_and_handler(irq, NULL, NULL); 791 irq_set_chip_data(irq, NULL); 792 } 793 } 794 795 static int __devinit stmpe_chip_init(struct stmpe *stmpe) 796 { 797 unsigned int irq_trigger = stmpe->pdata->irq_trigger; 798 int autosleep_timeout = stmpe->pdata->autosleep_timeout; 799 struct stmpe_variant_info *variant = stmpe->variant; 800 u8 icr = STMPE_ICR_LSB_GIM; 801 unsigned int id; 802 u8 data[2]; 803 int ret; 804 805 ret = stmpe_block_read(stmpe, stmpe->regs[STMPE_IDX_CHIP_ID], 806 ARRAY_SIZE(data), data); 807 if (ret < 0) 808 return ret; 809 810 id = (data[0] << 8) | data[1]; 811 if ((id & variant->id_mask) != variant->id_val) { 812 dev_err(stmpe->dev, "unknown chip id: %#x\n", id); 813 return -EINVAL; 814 } 815 816 dev_info(stmpe->dev, "%s detected, chip id: %#x\n", variant->name, id); 817 818 /* Disable all modules -- subdrivers should enable what they need. */ 819 ret = stmpe_disable(stmpe, ~0); 820 if (ret) 821 return ret; 822 823 if (irq_trigger == IRQF_TRIGGER_FALLING || 824 irq_trigger == IRQF_TRIGGER_RISING) 825 icr |= STMPE_ICR_LSB_EDGE; 826 827 if (irq_trigger == IRQF_TRIGGER_RISING || 828 irq_trigger == IRQF_TRIGGER_HIGH) 829 icr |= STMPE_ICR_LSB_HIGH; 830 831 if (stmpe->pdata->irq_invert_polarity) 832 icr ^= STMPE_ICR_LSB_HIGH; 833 834 if (stmpe->pdata->autosleep) { 835 ret = stmpe_autosleep(stmpe, autosleep_timeout); 836 if (ret) 837 return ret; 838 } 839 840 return stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_ICR_LSB], icr); 841 } 842 843 static int __devinit stmpe_add_device(struct stmpe *stmpe, 844 struct mfd_cell *cell, int irq) 845 { 846 return mfd_add_devices(stmpe->dev, stmpe->pdata->id, cell, 1, 847 NULL, stmpe->irq_base + irq); 848 } 849 850 static int __devinit stmpe_devices_init(struct stmpe *stmpe) 851 { 852 struct stmpe_variant_info *variant = stmpe->variant; 853 unsigned int platform_blocks = stmpe->pdata->blocks; 854 int ret = -EINVAL; 855 int i; 856 857 for (i = 0; i < variant->num_blocks; i++) { 858 struct stmpe_variant_block *block = &variant->blocks[i]; 859 860 if (!(platform_blocks & block->block)) 861 continue; 862 863 platform_blocks &= ~block->block; 864 ret = stmpe_add_device(stmpe, block->cell, block->irq); 865 if (ret) 866 return ret; 867 } 868 869 if (platform_blocks) 870 dev_warn(stmpe->dev, 871 "platform wants blocks (%#x) not present on variant", 872 platform_blocks); 873 874 return ret; 875 } 876 877 #ifdef CONFIG_PM 878 static int stmpe_suspend(struct device *dev) 879 { 880 struct i2c_client *i2c = to_i2c_client(dev); 881 struct stmpe *stmpe = i2c_get_clientdata(i2c); 882 883 if (device_may_wakeup(&i2c->dev)) 884 enable_irq_wake(stmpe->irq); 885 886 return 0; 887 } 888 889 static int stmpe_resume(struct device *dev) 890 { 891 struct i2c_client *i2c = to_i2c_client(dev); 892 struct stmpe *stmpe = i2c_get_clientdata(i2c); 893 894 if (device_may_wakeup(&i2c->dev)) 895 disable_irq_wake(stmpe->irq); 896 897 return 0; 898 } 899 #endif 900 901 static int __devinit stmpe_probe(struct i2c_client *i2c, 902 const struct i2c_device_id *id) 903 { 904 struct stmpe_platform_data *pdata = i2c->dev.platform_data; 905 struct stmpe *stmpe; 906 int ret; 907 908 if (!pdata) 909 return -EINVAL; 910 911 stmpe = kzalloc(sizeof(struct stmpe), GFP_KERNEL); 912 if (!stmpe) 913 return -ENOMEM; 914 915 mutex_init(&stmpe->irq_lock); 916 mutex_init(&stmpe->lock); 917 918 stmpe->dev = &i2c->dev; 919 stmpe->i2c = i2c; 920 921 stmpe->pdata = pdata; 922 stmpe->irq_base = pdata->irq_base; 923 924 stmpe->partnum = id->driver_data; 925 stmpe->variant = stmpe_variant_info[stmpe->partnum]; 926 stmpe->regs = stmpe->variant->regs; 927 stmpe->num_gpios = stmpe->variant->num_gpios; 928 929 i2c_set_clientdata(i2c, stmpe); 930 931 if (pdata->irq_over_gpio) { 932 ret = gpio_request_one(pdata->irq_gpio, GPIOF_DIR_IN, "stmpe"); 933 if (ret) { 934 dev_err(stmpe->dev, "failed to request IRQ GPIO: %d\n", 935 ret); 936 goto out_free; 937 } 938 939 stmpe->irq = gpio_to_irq(pdata->irq_gpio); 940 } else { 941 stmpe->irq = i2c->irq; 942 } 943 944 ret = stmpe_chip_init(stmpe); 945 if (ret) 946 goto free_gpio; 947 948 ret = stmpe_irq_init(stmpe); 949 if (ret) 950 goto free_gpio; 951 952 ret = request_threaded_irq(stmpe->irq, NULL, stmpe_irq, 953 pdata->irq_trigger | IRQF_ONESHOT, 954 "stmpe", stmpe); 955 if (ret) { 956 dev_err(stmpe->dev, "failed to request IRQ: %d\n", ret); 957 goto out_removeirq; 958 } 959 960 ret = stmpe_devices_init(stmpe); 961 if (ret) { 962 dev_err(stmpe->dev, "failed to add children\n"); 963 goto out_removedevs; 964 } 965 966 return 0; 967 968 out_removedevs: 969 mfd_remove_devices(stmpe->dev); 970 free_irq(stmpe->irq, stmpe); 971 out_removeirq: 972 stmpe_irq_remove(stmpe); 973 free_gpio: 974 if (pdata->irq_over_gpio) 975 gpio_free(pdata->irq_gpio); 976 out_free: 977 kfree(stmpe); 978 return ret; 979 } 980 981 static int __devexit stmpe_remove(struct i2c_client *client) 982 { 983 struct stmpe *stmpe = i2c_get_clientdata(client); 984 985 mfd_remove_devices(stmpe->dev); 986 987 free_irq(stmpe->irq, stmpe); 988 stmpe_irq_remove(stmpe); 989 990 if (stmpe->pdata->irq_over_gpio) 991 gpio_free(stmpe->pdata->irq_gpio); 992 993 kfree(stmpe); 994 995 return 0; 996 } 997 998 static const struct i2c_device_id stmpe_id[] = { 999 { "stmpe811", STMPE811 }, 1000 { "stmpe1601", STMPE1601 }, 1001 { "stmpe2401", STMPE2401 }, 1002 { "stmpe2403", STMPE2403 }, 1003 { } 1004 }; 1005 MODULE_DEVICE_TABLE(i2c, stmpe_id); 1006 1007 #ifdef CONFIG_PM 1008 static const struct dev_pm_ops stmpe_dev_pm_ops = { 1009 .suspend = stmpe_suspend, 1010 .resume = stmpe_resume, 1011 }; 1012 #endif 1013 1014 static struct i2c_driver stmpe_driver = { 1015 .driver.name = "stmpe", 1016 .driver.owner = THIS_MODULE, 1017 #ifdef CONFIG_PM 1018 .driver.pm = &stmpe_dev_pm_ops, 1019 #endif 1020 .probe = stmpe_probe, 1021 .remove = __devexit_p(stmpe_remove), 1022 .id_table = stmpe_id, 1023 }; 1024 1025 static int __init stmpe_init(void) 1026 { 1027 return i2c_add_driver(&stmpe_driver); 1028 } 1029 subsys_initcall(stmpe_init); 1030 1031 static void __exit stmpe_exit(void) 1032 { 1033 i2c_del_driver(&stmpe_driver); 1034 } 1035 module_exit(stmpe_exit); 1036 1037 MODULE_LICENSE("GPL v2"); 1038 MODULE_DESCRIPTION("STMPE MFD core driver"); 1039 MODULE_AUTHOR("Rabin Vincent <rabin.vincent@stericsson.com>"); 1040