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