Rabin Vincent | 27e3499 | 2010-07-02 16:52:08 +0530 | [diff] [blame^] | 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/kernel.h> |
| 9 | #include <linux/module.h> |
| 10 | #include <linux/interrupt.h> |
| 11 | #include <linux/irq.h> |
| 12 | #include <linux/slab.h> |
| 13 | #include <linux/i2c.h> |
| 14 | #include <linux/mfd/core.h> |
| 15 | #include <linux/mfd/stmpe.h> |
| 16 | #include "stmpe.h" |
| 17 | |
| 18 | static int __stmpe_enable(struct stmpe *stmpe, unsigned int blocks) |
| 19 | { |
| 20 | return stmpe->variant->enable(stmpe, blocks, true); |
| 21 | } |
| 22 | |
| 23 | static int __stmpe_disable(struct stmpe *stmpe, unsigned int blocks) |
| 24 | { |
| 25 | return stmpe->variant->enable(stmpe, blocks, false); |
| 26 | } |
| 27 | |
| 28 | static int __stmpe_reg_read(struct stmpe *stmpe, u8 reg) |
| 29 | { |
| 30 | int ret; |
| 31 | |
| 32 | ret = i2c_smbus_read_byte_data(stmpe->i2c, reg); |
| 33 | if (ret < 0) |
| 34 | dev_err(stmpe->dev, "failed to read reg %#x: %d\n", |
| 35 | reg, ret); |
| 36 | |
| 37 | dev_vdbg(stmpe->dev, "rd: reg %#x => data %#x\n", reg, ret); |
| 38 | |
| 39 | return ret; |
| 40 | } |
| 41 | |
| 42 | static int __stmpe_reg_write(struct stmpe *stmpe, u8 reg, u8 val) |
| 43 | { |
| 44 | int ret; |
| 45 | |
| 46 | dev_vdbg(stmpe->dev, "wr: reg %#x <= %#x\n", reg, val); |
| 47 | |
| 48 | ret = i2c_smbus_write_byte_data(stmpe->i2c, reg, val); |
| 49 | if (ret < 0) |
| 50 | dev_err(stmpe->dev, "failed to write reg %#x: %d\n", |
| 51 | reg, ret); |
| 52 | |
| 53 | return ret; |
| 54 | } |
| 55 | |
| 56 | static int __stmpe_set_bits(struct stmpe *stmpe, u8 reg, u8 mask, u8 val) |
| 57 | { |
| 58 | int ret; |
| 59 | |
| 60 | ret = __stmpe_reg_read(stmpe, reg); |
| 61 | if (ret < 0) |
| 62 | return ret; |
| 63 | |
| 64 | ret &= ~mask; |
| 65 | ret |= val; |
| 66 | |
| 67 | return __stmpe_reg_write(stmpe, reg, ret); |
| 68 | } |
| 69 | |
| 70 | static int __stmpe_block_read(struct stmpe *stmpe, u8 reg, u8 length, |
| 71 | u8 *values) |
| 72 | { |
| 73 | int ret; |
| 74 | |
| 75 | ret = i2c_smbus_read_i2c_block_data(stmpe->i2c, reg, length, values); |
| 76 | if (ret < 0) |
| 77 | dev_err(stmpe->dev, "failed to read regs %#x: %d\n", |
| 78 | reg, ret); |
| 79 | |
| 80 | dev_vdbg(stmpe->dev, "rd: reg %#x (%d) => ret %#x\n", reg, length, ret); |
| 81 | stmpe_dump_bytes("stmpe rd: ", values, length); |
| 82 | |
| 83 | return ret; |
| 84 | } |
| 85 | |
| 86 | static int __stmpe_block_write(struct stmpe *stmpe, u8 reg, u8 length, |
| 87 | const u8 *values) |
| 88 | { |
| 89 | int ret; |
| 90 | |
| 91 | dev_vdbg(stmpe->dev, "wr: regs %#x (%d)\n", reg, length); |
| 92 | stmpe_dump_bytes("stmpe wr: ", values, length); |
| 93 | |
| 94 | ret = i2c_smbus_write_i2c_block_data(stmpe->i2c, reg, length, |
| 95 | values); |
| 96 | if (ret < 0) |
| 97 | dev_err(stmpe->dev, "failed to write regs %#x: %d\n", |
| 98 | reg, ret); |
| 99 | |
| 100 | return ret; |
| 101 | } |
| 102 | |
| 103 | /** |
| 104 | * stmpe_enable - enable blocks on an STMPE device |
| 105 | * @stmpe: Device to work on |
| 106 | * @blocks: Mask of blocks (enum stmpe_block values) to enable |
| 107 | */ |
| 108 | int stmpe_enable(struct stmpe *stmpe, unsigned int blocks) |
| 109 | { |
| 110 | int ret; |
| 111 | |
| 112 | mutex_lock(&stmpe->lock); |
| 113 | ret = __stmpe_enable(stmpe, blocks); |
| 114 | mutex_unlock(&stmpe->lock); |
| 115 | |
| 116 | return ret; |
| 117 | } |
| 118 | EXPORT_SYMBOL_GPL(stmpe_enable); |
| 119 | |
| 120 | /** |
| 121 | * stmpe_disable - disable blocks on an STMPE device |
| 122 | * @stmpe: Device to work on |
| 123 | * @blocks: Mask of blocks (enum stmpe_block values) to enable |
| 124 | */ |
| 125 | int stmpe_disable(struct stmpe *stmpe, unsigned int blocks) |
| 126 | { |
| 127 | int ret; |
| 128 | |
| 129 | mutex_lock(&stmpe->lock); |
| 130 | ret = __stmpe_disable(stmpe, blocks); |
| 131 | mutex_unlock(&stmpe->lock); |
| 132 | |
| 133 | return ret; |
| 134 | } |
| 135 | EXPORT_SYMBOL_GPL(stmpe_disable); |
| 136 | |
| 137 | /** |
| 138 | * stmpe_reg_read() - read a single STMPE register |
| 139 | * @stmpe: Device to read from |
| 140 | * @reg: Register to read |
| 141 | */ |
| 142 | int stmpe_reg_read(struct stmpe *stmpe, u8 reg) |
| 143 | { |
| 144 | int ret; |
| 145 | |
| 146 | mutex_lock(&stmpe->lock); |
| 147 | ret = __stmpe_reg_read(stmpe, reg); |
| 148 | mutex_unlock(&stmpe->lock); |
| 149 | |
| 150 | return ret; |
| 151 | } |
| 152 | EXPORT_SYMBOL_GPL(stmpe_reg_read); |
| 153 | |
| 154 | /** |
| 155 | * stmpe_reg_write() - write a single STMPE register |
| 156 | * @stmpe: Device to write to |
| 157 | * @reg: Register to write |
| 158 | * @val: Value to write |
| 159 | */ |
| 160 | int stmpe_reg_write(struct stmpe *stmpe, u8 reg, u8 val) |
| 161 | { |
| 162 | int ret; |
| 163 | |
| 164 | mutex_lock(&stmpe->lock); |
| 165 | ret = __stmpe_reg_write(stmpe, reg, val); |
| 166 | mutex_unlock(&stmpe->lock); |
| 167 | |
| 168 | return ret; |
| 169 | } |
| 170 | EXPORT_SYMBOL_GPL(stmpe_reg_write); |
| 171 | |
| 172 | /** |
| 173 | * stmpe_set_bits() - set the value of a bitfield in a STMPE register |
| 174 | * @stmpe: Device to write to |
| 175 | * @reg: Register to write |
| 176 | * @mask: Mask of bits to set |
| 177 | * @val: Value to set |
| 178 | */ |
| 179 | int stmpe_set_bits(struct stmpe *stmpe, u8 reg, u8 mask, u8 val) |
| 180 | { |
| 181 | int ret; |
| 182 | |
| 183 | mutex_lock(&stmpe->lock); |
| 184 | ret = __stmpe_set_bits(stmpe, reg, mask, val); |
| 185 | mutex_unlock(&stmpe->lock); |
| 186 | |
| 187 | return ret; |
| 188 | } |
| 189 | EXPORT_SYMBOL_GPL(stmpe_set_bits); |
| 190 | |
| 191 | /** |
| 192 | * stmpe_block_read() - read multiple STMPE registers |
| 193 | * @stmpe: Device to read from |
| 194 | * @reg: First register |
| 195 | * @length: Number of registers |
| 196 | * @values: Buffer to write to |
| 197 | */ |
| 198 | int stmpe_block_read(struct stmpe *stmpe, u8 reg, u8 length, u8 *values) |
| 199 | { |
| 200 | int ret; |
| 201 | |
| 202 | mutex_lock(&stmpe->lock); |
| 203 | ret = __stmpe_block_read(stmpe, reg, length, values); |
| 204 | mutex_unlock(&stmpe->lock); |
| 205 | |
| 206 | return ret; |
| 207 | } |
| 208 | EXPORT_SYMBOL_GPL(stmpe_block_read); |
| 209 | |
| 210 | /** |
| 211 | * stmpe_block_write() - write multiple STMPE registers |
| 212 | * @stmpe: Device to write to |
| 213 | * @reg: First register |
| 214 | * @length: Number of registers |
| 215 | * @values: Values to write |
| 216 | */ |
| 217 | int stmpe_block_write(struct stmpe *stmpe, u8 reg, u8 length, |
| 218 | const u8 *values) |
| 219 | { |
| 220 | int ret; |
| 221 | |
| 222 | mutex_lock(&stmpe->lock); |
| 223 | ret = __stmpe_block_write(stmpe, reg, length, values); |
| 224 | mutex_unlock(&stmpe->lock); |
| 225 | |
| 226 | return ret; |
| 227 | } |
| 228 | EXPORT_SYMBOL_GPL(stmpe_block_write); |
| 229 | |
| 230 | /** |
| 231 | * stmpe_set_altfunc: set the alternate function for STMPE pins |
| 232 | * @stmpe: Device to configure |
| 233 | * @pins: Bitmask of pins to affect |
| 234 | * @block: block to enable alternate functions for |
| 235 | * |
| 236 | * @pins is assumed to have a bit set for each of the bits whose alternate |
| 237 | * function is to be changed, numbered according to the GPIOXY numbers. |
| 238 | * |
| 239 | * If the GPIO module is not enabled, this function automatically enables it in |
| 240 | * order to perform the change. |
| 241 | */ |
| 242 | int stmpe_set_altfunc(struct stmpe *stmpe, u32 pins, enum stmpe_block block) |
| 243 | { |
| 244 | struct stmpe_variant_info *variant = stmpe->variant; |
| 245 | u8 regaddr = stmpe->regs[STMPE_IDX_GPAFR_U_MSB]; |
| 246 | int af_bits = variant->af_bits; |
| 247 | int numregs = DIV_ROUND_UP(stmpe->num_gpios * af_bits, 8); |
| 248 | int afperreg = 8 / af_bits; |
| 249 | int mask = (1 << af_bits) - 1; |
| 250 | u8 regs[numregs]; |
| 251 | int af; |
| 252 | int ret; |
| 253 | |
| 254 | mutex_lock(&stmpe->lock); |
| 255 | |
| 256 | ret = __stmpe_enable(stmpe, STMPE_BLOCK_GPIO); |
| 257 | if (ret < 0) |
| 258 | goto out; |
| 259 | |
| 260 | ret = __stmpe_block_read(stmpe, regaddr, numregs, regs); |
| 261 | if (ret < 0) |
| 262 | goto out; |
| 263 | |
| 264 | af = variant->get_altfunc(stmpe, block); |
| 265 | |
| 266 | while (pins) { |
| 267 | int pin = __ffs(pins); |
| 268 | int regoffset = numregs - (pin / afperreg) - 1; |
| 269 | int pos = (pin % afperreg) * (8 / afperreg); |
| 270 | |
| 271 | regs[regoffset] &= ~(mask << pos); |
| 272 | regs[regoffset] |= af << pos; |
| 273 | |
| 274 | pins &= ~(1 << pin); |
| 275 | } |
| 276 | |
| 277 | ret = __stmpe_block_write(stmpe, regaddr, numregs, regs); |
| 278 | |
| 279 | out: |
| 280 | mutex_unlock(&stmpe->lock); |
| 281 | return ret; |
| 282 | } |
| 283 | EXPORT_SYMBOL_GPL(stmpe_set_altfunc); |
| 284 | |
| 285 | /* |
| 286 | * GPIO (all variants) |
| 287 | */ |
| 288 | |
| 289 | static struct resource stmpe_gpio_resources[] = { |
| 290 | /* Start and end filled dynamically */ |
| 291 | { |
| 292 | .flags = IORESOURCE_IRQ, |
| 293 | }, |
| 294 | }; |
| 295 | |
| 296 | static struct mfd_cell stmpe_gpio_cell = { |
| 297 | .name = "stmpe-gpio", |
| 298 | .resources = stmpe_gpio_resources, |
| 299 | .num_resources = ARRAY_SIZE(stmpe_gpio_resources), |
| 300 | }; |
| 301 | |
| 302 | /* |
| 303 | * Keypad (1601, 2401, 2403) |
| 304 | */ |
| 305 | |
| 306 | static struct resource stmpe_keypad_resources[] = { |
| 307 | { |
| 308 | .name = "KEYPAD", |
| 309 | .start = 0, |
| 310 | .end = 0, |
| 311 | .flags = IORESOURCE_IRQ, |
| 312 | }, |
| 313 | { |
| 314 | .name = "KEYPAD_OVER", |
| 315 | .start = 1, |
| 316 | .end = 1, |
| 317 | .flags = IORESOURCE_IRQ, |
| 318 | }, |
| 319 | }; |
| 320 | |
| 321 | static struct mfd_cell stmpe_keypad_cell = { |
| 322 | .name = "stmpe-keypad", |
| 323 | .resources = stmpe_keypad_resources, |
| 324 | .num_resources = ARRAY_SIZE(stmpe_keypad_resources), |
| 325 | }; |
| 326 | |
| 327 | /* |
| 328 | * Touchscreen (STMPE811) |
| 329 | */ |
| 330 | |
| 331 | static struct resource stmpe_ts_resources[] = { |
| 332 | { |
| 333 | .name = "TOUCH_DET", |
| 334 | .start = 0, |
| 335 | .end = 0, |
| 336 | .flags = IORESOURCE_IRQ, |
| 337 | }, |
| 338 | { |
| 339 | .name = "FIFO_TH", |
| 340 | .start = 1, |
| 341 | .end = 1, |
| 342 | .flags = IORESOURCE_IRQ, |
| 343 | }, |
| 344 | }; |
| 345 | |
| 346 | static struct mfd_cell stmpe_ts_cell = { |
| 347 | .name = "stmpe-ts", |
| 348 | .resources = stmpe_ts_resources, |
| 349 | .num_resources = ARRAY_SIZE(stmpe_ts_resources), |
| 350 | }; |
| 351 | |
| 352 | /* |
| 353 | * STMPE811 |
| 354 | */ |
| 355 | |
| 356 | static const u8 stmpe811_regs[] = { |
| 357 | [STMPE_IDX_CHIP_ID] = STMPE811_REG_CHIP_ID, |
| 358 | [STMPE_IDX_ICR_LSB] = STMPE811_REG_INT_CTRL, |
| 359 | [STMPE_IDX_IER_LSB] = STMPE811_REG_INT_EN, |
| 360 | [STMPE_IDX_ISR_MSB] = STMPE811_REG_INT_STA, |
| 361 | [STMPE_IDX_GPMR_LSB] = STMPE811_REG_GPIO_MP_STA, |
| 362 | [STMPE_IDX_GPSR_LSB] = STMPE811_REG_GPIO_SET_PIN, |
| 363 | [STMPE_IDX_GPCR_LSB] = STMPE811_REG_GPIO_CLR_PIN, |
| 364 | [STMPE_IDX_GPDR_LSB] = STMPE811_REG_GPIO_DIR, |
| 365 | [STMPE_IDX_GPRER_LSB] = STMPE811_REG_GPIO_RE, |
| 366 | [STMPE_IDX_GPFER_LSB] = STMPE811_REG_GPIO_FE, |
| 367 | [STMPE_IDX_GPAFR_U_MSB] = STMPE811_REG_GPIO_AF, |
| 368 | [STMPE_IDX_IEGPIOR_LSB] = STMPE811_REG_GPIO_INT_EN, |
| 369 | [STMPE_IDX_ISGPIOR_MSB] = STMPE811_REG_GPIO_INT_STA, |
| 370 | [STMPE_IDX_GPEDR_MSB] = STMPE811_REG_GPIO_ED, |
| 371 | }; |
| 372 | |
| 373 | static struct stmpe_variant_block stmpe811_blocks[] = { |
| 374 | { |
| 375 | .cell = &stmpe_gpio_cell, |
| 376 | .irq = STMPE811_IRQ_GPIOC, |
| 377 | .block = STMPE_BLOCK_GPIO, |
| 378 | }, |
| 379 | { |
| 380 | .cell = &stmpe_ts_cell, |
| 381 | .irq = STMPE811_IRQ_TOUCH_DET, |
| 382 | .block = STMPE_BLOCK_TOUCHSCREEN, |
| 383 | }, |
| 384 | }; |
| 385 | |
| 386 | static int stmpe811_enable(struct stmpe *stmpe, unsigned int blocks, |
| 387 | bool enable) |
| 388 | { |
| 389 | unsigned int mask = 0; |
| 390 | |
| 391 | if (blocks & STMPE_BLOCK_GPIO) |
| 392 | mask |= STMPE811_SYS_CTRL2_GPIO_OFF; |
| 393 | |
| 394 | if (blocks & STMPE_BLOCK_ADC) |
| 395 | mask |= STMPE811_SYS_CTRL2_ADC_OFF; |
| 396 | |
| 397 | if (blocks & STMPE_BLOCK_TOUCHSCREEN) |
| 398 | mask |= STMPE811_SYS_CTRL2_TSC_OFF; |
| 399 | |
| 400 | return __stmpe_set_bits(stmpe, STMPE811_REG_SYS_CTRL2, mask, |
| 401 | enable ? 0 : mask); |
| 402 | } |
| 403 | |
| 404 | static int stmpe811_get_altfunc(struct stmpe *stmpe, enum stmpe_block block) |
| 405 | { |
| 406 | /* 0 for touchscreen, 1 for GPIO */ |
| 407 | return block != STMPE_BLOCK_TOUCHSCREEN; |
| 408 | } |
| 409 | |
| 410 | static struct stmpe_variant_info stmpe811 = { |
| 411 | .name = "stmpe811", |
| 412 | .id_val = 0x0811, |
| 413 | .id_mask = 0xffff, |
| 414 | .num_gpios = 8, |
| 415 | .af_bits = 1, |
| 416 | .regs = stmpe811_regs, |
| 417 | .blocks = stmpe811_blocks, |
| 418 | .num_blocks = ARRAY_SIZE(stmpe811_blocks), |
| 419 | .num_irqs = STMPE811_NR_INTERNAL_IRQS, |
| 420 | .enable = stmpe811_enable, |
| 421 | .get_altfunc = stmpe811_get_altfunc, |
| 422 | }; |
| 423 | |
| 424 | /* |
| 425 | * STMPE1601 |
| 426 | */ |
| 427 | |
| 428 | static const u8 stmpe1601_regs[] = { |
| 429 | [STMPE_IDX_CHIP_ID] = STMPE1601_REG_CHIP_ID, |
| 430 | [STMPE_IDX_ICR_LSB] = STMPE1601_REG_ICR_LSB, |
| 431 | [STMPE_IDX_IER_LSB] = STMPE1601_REG_IER_LSB, |
| 432 | [STMPE_IDX_ISR_MSB] = STMPE1601_REG_ISR_MSB, |
| 433 | [STMPE_IDX_GPMR_LSB] = STMPE1601_REG_GPIO_MP_LSB, |
| 434 | [STMPE_IDX_GPSR_LSB] = STMPE1601_REG_GPIO_SET_LSB, |
| 435 | [STMPE_IDX_GPCR_LSB] = STMPE1601_REG_GPIO_CLR_LSB, |
| 436 | [STMPE_IDX_GPDR_LSB] = STMPE1601_REG_GPIO_SET_DIR_LSB, |
| 437 | [STMPE_IDX_GPRER_LSB] = STMPE1601_REG_GPIO_RE_LSB, |
| 438 | [STMPE_IDX_GPFER_LSB] = STMPE1601_REG_GPIO_FE_LSB, |
| 439 | [STMPE_IDX_GPAFR_U_MSB] = STMPE1601_REG_GPIO_AF_U_MSB, |
| 440 | [STMPE_IDX_IEGPIOR_LSB] = STMPE1601_REG_INT_EN_GPIO_MASK_LSB, |
| 441 | [STMPE_IDX_ISGPIOR_MSB] = STMPE1601_REG_INT_STA_GPIO_MSB, |
| 442 | [STMPE_IDX_GPEDR_MSB] = STMPE1601_REG_GPIO_ED_MSB, |
| 443 | }; |
| 444 | |
| 445 | static struct stmpe_variant_block stmpe1601_blocks[] = { |
| 446 | { |
| 447 | .cell = &stmpe_gpio_cell, |
| 448 | .irq = STMPE24XX_IRQ_GPIOC, |
| 449 | .block = STMPE_BLOCK_GPIO, |
| 450 | }, |
| 451 | { |
| 452 | .cell = &stmpe_keypad_cell, |
| 453 | .irq = STMPE24XX_IRQ_KEYPAD, |
| 454 | .block = STMPE_BLOCK_KEYPAD, |
| 455 | }, |
| 456 | }; |
| 457 | |
| 458 | static int stmpe1601_enable(struct stmpe *stmpe, unsigned int blocks, |
| 459 | bool enable) |
| 460 | { |
| 461 | unsigned int mask = 0; |
| 462 | |
| 463 | if (blocks & STMPE_BLOCK_GPIO) |
| 464 | mask |= STMPE1601_SYS_CTRL_ENABLE_GPIO; |
| 465 | |
| 466 | if (blocks & STMPE_BLOCK_KEYPAD) |
| 467 | mask |= STMPE1601_SYS_CTRL_ENABLE_KPC; |
| 468 | |
| 469 | return __stmpe_set_bits(stmpe, STMPE1601_REG_SYS_CTRL, mask, |
| 470 | enable ? mask : 0); |
| 471 | } |
| 472 | |
| 473 | static int stmpe1601_get_altfunc(struct stmpe *stmpe, enum stmpe_block block) |
| 474 | { |
| 475 | switch (block) { |
| 476 | case STMPE_BLOCK_PWM: |
| 477 | return 2; |
| 478 | |
| 479 | case STMPE_BLOCK_KEYPAD: |
| 480 | return 1; |
| 481 | |
| 482 | case STMPE_BLOCK_GPIO: |
| 483 | default: |
| 484 | return 0; |
| 485 | } |
| 486 | } |
| 487 | |
| 488 | static struct stmpe_variant_info stmpe1601 = { |
| 489 | .name = "stmpe1601", |
| 490 | .id_val = 0x0210, |
| 491 | .id_mask = 0xfff0, /* at least 0x0210 and 0x0212 */ |
| 492 | .num_gpios = 16, |
| 493 | .af_bits = 2, |
| 494 | .regs = stmpe1601_regs, |
| 495 | .blocks = stmpe1601_blocks, |
| 496 | .num_blocks = ARRAY_SIZE(stmpe1601_blocks), |
| 497 | .num_irqs = STMPE1601_NR_INTERNAL_IRQS, |
| 498 | .enable = stmpe1601_enable, |
| 499 | .get_altfunc = stmpe1601_get_altfunc, |
| 500 | }; |
| 501 | |
| 502 | /* |
| 503 | * STMPE24XX |
| 504 | */ |
| 505 | |
| 506 | static const u8 stmpe24xx_regs[] = { |
| 507 | [STMPE_IDX_CHIP_ID] = STMPE24XX_REG_CHIP_ID, |
| 508 | [STMPE_IDX_ICR_LSB] = STMPE24XX_REG_ICR_LSB, |
| 509 | [STMPE_IDX_IER_LSB] = STMPE24XX_REG_IER_LSB, |
| 510 | [STMPE_IDX_ISR_MSB] = STMPE24XX_REG_ISR_MSB, |
| 511 | [STMPE_IDX_GPMR_LSB] = STMPE24XX_REG_GPMR_LSB, |
| 512 | [STMPE_IDX_GPSR_LSB] = STMPE24XX_REG_GPSR_LSB, |
| 513 | [STMPE_IDX_GPCR_LSB] = STMPE24XX_REG_GPCR_LSB, |
| 514 | [STMPE_IDX_GPDR_LSB] = STMPE24XX_REG_GPDR_LSB, |
| 515 | [STMPE_IDX_GPRER_LSB] = STMPE24XX_REG_GPRER_LSB, |
| 516 | [STMPE_IDX_GPFER_LSB] = STMPE24XX_REG_GPFER_LSB, |
| 517 | [STMPE_IDX_GPAFR_U_MSB] = STMPE24XX_REG_GPAFR_U_MSB, |
| 518 | [STMPE_IDX_IEGPIOR_LSB] = STMPE24XX_REG_IEGPIOR_LSB, |
| 519 | [STMPE_IDX_ISGPIOR_MSB] = STMPE24XX_REG_ISGPIOR_MSB, |
| 520 | [STMPE_IDX_GPEDR_MSB] = STMPE24XX_REG_GPEDR_MSB, |
| 521 | }; |
| 522 | |
| 523 | static struct stmpe_variant_block stmpe24xx_blocks[] = { |
| 524 | { |
| 525 | .cell = &stmpe_gpio_cell, |
| 526 | .irq = STMPE24XX_IRQ_GPIOC, |
| 527 | .block = STMPE_BLOCK_GPIO, |
| 528 | }, |
| 529 | { |
| 530 | .cell = &stmpe_keypad_cell, |
| 531 | .irq = STMPE24XX_IRQ_KEYPAD, |
| 532 | .block = STMPE_BLOCK_KEYPAD, |
| 533 | }, |
| 534 | }; |
| 535 | |
| 536 | static int stmpe24xx_enable(struct stmpe *stmpe, unsigned int blocks, |
| 537 | bool enable) |
| 538 | { |
| 539 | unsigned int mask = 0; |
| 540 | |
| 541 | if (blocks & STMPE_BLOCK_GPIO) |
| 542 | mask |= STMPE24XX_SYS_CTRL_ENABLE_GPIO; |
| 543 | |
| 544 | if (blocks & STMPE_BLOCK_KEYPAD) |
| 545 | mask |= STMPE24XX_SYS_CTRL_ENABLE_KPC; |
| 546 | |
| 547 | return __stmpe_set_bits(stmpe, STMPE24XX_REG_SYS_CTRL, mask, |
| 548 | enable ? mask : 0); |
| 549 | } |
| 550 | |
| 551 | static int stmpe24xx_get_altfunc(struct stmpe *stmpe, enum stmpe_block block) |
| 552 | { |
| 553 | switch (block) { |
| 554 | case STMPE_BLOCK_ROTATOR: |
| 555 | return 2; |
| 556 | |
| 557 | case STMPE_BLOCK_KEYPAD: |
| 558 | return 1; |
| 559 | |
| 560 | case STMPE_BLOCK_GPIO: |
| 561 | default: |
| 562 | return 0; |
| 563 | } |
| 564 | } |
| 565 | |
| 566 | static struct stmpe_variant_info stmpe2401 = { |
| 567 | .name = "stmpe2401", |
| 568 | .id_val = 0x0101, |
| 569 | .id_mask = 0xffff, |
| 570 | .num_gpios = 24, |
| 571 | .af_bits = 2, |
| 572 | .regs = stmpe24xx_regs, |
| 573 | .blocks = stmpe24xx_blocks, |
| 574 | .num_blocks = ARRAY_SIZE(stmpe24xx_blocks), |
| 575 | .num_irqs = STMPE24XX_NR_INTERNAL_IRQS, |
| 576 | .enable = stmpe24xx_enable, |
| 577 | .get_altfunc = stmpe24xx_get_altfunc, |
| 578 | }; |
| 579 | |
| 580 | static struct stmpe_variant_info stmpe2403 = { |
| 581 | .name = "stmpe2403", |
| 582 | .id_val = 0x0120, |
| 583 | .id_mask = 0xffff, |
| 584 | .num_gpios = 24, |
| 585 | .af_bits = 2, |
| 586 | .regs = stmpe24xx_regs, |
| 587 | .blocks = stmpe24xx_blocks, |
| 588 | .num_blocks = ARRAY_SIZE(stmpe24xx_blocks), |
| 589 | .num_irqs = STMPE24XX_NR_INTERNAL_IRQS, |
| 590 | .enable = stmpe24xx_enable, |
| 591 | .get_altfunc = stmpe24xx_get_altfunc, |
| 592 | }; |
| 593 | |
| 594 | static struct stmpe_variant_info *stmpe_variant_info[] = { |
| 595 | [STMPE811] = &stmpe811, |
| 596 | [STMPE1601] = &stmpe1601, |
| 597 | [STMPE2401] = &stmpe2401, |
| 598 | [STMPE2403] = &stmpe2403, |
| 599 | }; |
| 600 | |
| 601 | static irqreturn_t stmpe_irq(int irq, void *data) |
| 602 | { |
| 603 | struct stmpe *stmpe = data; |
| 604 | struct stmpe_variant_info *variant = stmpe->variant; |
| 605 | int num = DIV_ROUND_UP(variant->num_irqs, 8); |
| 606 | u8 israddr = stmpe->regs[STMPE_IDX_ISR_MSB]; |
| 607 | u8 isr[num]; |
| 608 | int ret; |
| 609 | int i; |
| 610 | |
| 611 | ret = stmpe_block_read(stmpe, israddr, num, isr); |
| 612 | if (ret < 0) |
| 613 | return IRQ_NONE; |
| 614 | |
| 615 | for (i = 0; i < num; i++) { |
| 616 | int bank = num - i - 1; |
| 617 | u8 status = isr[i]; |
| 618 | u8 clear; |
| 619 | |
| 620 | status &= stmpe->ier[bank]; |
| 621 | if (!status) |
| 622 | continue; |
| 623 | |
| 624 | clear = status; |
| 625 | while (status) { |
| 626 | int bit = __ffs(status); |
| 627 | int line = bank * 8 + bit; |
| 628 | |
| 629 | handle_nested_irq(stmpe->irq_base + line); |
| 630 | status &= ~(1 << bit); |
| 631 | } |
| 632 | |
| 633 | stmpe_reg_write(stmpe, israddr + i, clear); |
| 634 | } |
| 635 | |
| 636 | return IRQ_HANDLED; |
| 637 | } |
| 638 | |
| 639 | static void stmpe_irq_lock(unsigned int irq) |
| 640 | { |
| 641 | struct stmpe *stmpe = get_irq_chip_data(irq); |
| 642 | |
| 643 | mutex_lock(&stmpe->irq_lock); |
| 644 | } |
| 645 | |
| 646 | static void stmpe_irq_sync_unlock(unsigned int irq) |
| 647 | { |
| 648 | struct stmpe *stmpe = get_irq_chip_data(irq); |
| 649 | struct stmpe_variant_info *variant = stmpe->variant; |
| 650 | int num = DIV_ROUND_UP(variant->num_irqs, 8); |
| 651 | int i; |
| 652 | |
| 653 | for (i = 0; i < num; i++) { |
| 654 | u8 new = stmpe->ier[i]; |
| 655 | u8 old = stmpe->oldier[i]; |
| 656 | |
| 657 | if (new == old) |
| 658 | continue; |
| 659 | |
| 660 | stmpe->oldier[i] = new; |
| 661 | stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_IER_LSB] - i, new); |
| 662 | } |
| 663 | |
| 664 | mutex_unlock(&stmpe->irq_lock); |
| 665 | } |
| 666 | |
| 667 | static void stmpe_irq_mask(unsigned int irq) |
| 668 | { |
| 669 | struct stmpe *stmpe = get_irq_chip_data(irq); |
| 670 | int offset = irq - stmpe->irq_base; |
| 671 | int regoffset = offset / 8; |
| 672 | int mask = 1 << (offset % 8); |
| 673 | |
| 674 | stmpe->ier[regoffset] &= ~mask; |
| 675 | } |
| 676 | |
| 677 | static void stmpe_irq_unmask(unsigned int irq) |
| 678 | { |
| 679 | struct stmpe *stmpe = get_irq_chip_data(irq); |
| 680 | int offset = irq - stmpe->irq_base; |
| 681 | int regoffset = offset / 8; |
| 682 | int mask = 1 << (offset % 8); |
| 683 | |
| 684 | stmpe->ier[regoffset] |= mask; |
| 685 | } |
| 686 | |
| 687 | static struct irq_chip stmpe_irq_chip = { |
| 688 | .name = "stmpe", |
| 689 | .bus_lock = stmpe_irq_lock, |
| 690 | .bus_sync_unlock = stmpe_irq_sync_unlock, |
| 691 | .mask = stmpe_irq_mask, |
| 692 | .unmask = stmpe_irq_unmask, |
| 693 | }; |
| 694 | |
| 695 | static int __devinit stmpe_irq_init(struct stmpe *stmpe) |
| 696 | { |
| 697 | int num_irqs = stmpe->variant->num_irqs; |
| 698 | int base = stmpe->irq_base; |
| 699 | int irq; |
| 700 | |
| 701 | for (irq = base; irq < base + num_irqs; irq++) { |
| 702 | set_irq_chip_data(irq, stmpe); |
| 703 | set_irq_chip_and_handler(irq, &stmpe_irq_chip, |
| 704 | handle_edge_irq); |
| 705 | set_irq_nested_thread(irq, 1); |
| 706 | #ifdef CONFIG_ARM |
| 707 | set_irq_flags(irq, IRQF_VALID); |
| 708 | #else |
| 709 | set_irq_noprobe(irq); |
| 710 | #endif |
| 711 | } |
| 712 | |
| 713 | return 0; |
| 714 | } |
| 715 | |
| 716 | static void stmpe_irq_remove(struct stmpe *stmpe) |
| 717 | { |
| 718 | int num_irqs = stmpe->variant->num_irqs; |
| 719 | int base = stmpe->irq_base; |
| 720 | int irq; |
| 721 | |
| 722 | for (irq = base; irq < base + num_irqs; irq++) { |
| 723 | #ifdef CONFIG_ARM |
| 724 | set_irq_flags(irq, 0); |
| 725 | #endif |
| 726 | set_irq_chip_and_handler(irq, NULL, NULL); |
| 727 | set_irq_chip_data(irq, NULL); |
| 728 | } |
| 729 | } |
| 730 | |
| 731 | static int __devinit stmpe_chip_init(struct stmpe *stmpe) |
| 732 | { |
| 733 | unsigned int irq_trigger = stmpe->pdata->irq_trigger; |
| 734 | struct stmpe_variant_info *variant = stmpe->variant; |
| 735 | u8 icr = STMPE_ICR_LSB_GIM; |
| 736 | unsigned int id; |
| 737 | u8 data[2]; |
| 738 | int ret; |
| 739 | |
| 740 | ret = stmpe_block_read(stmpe, stmpe->regs[STMPE_IDX_CHIP_ID], |
| 741 | ARRAY_SIZE(data), data); |
| 742 | if (ret < 0) |
| 743 | return ret; |
| 744 | |
| 745 | id = (data[0] << 8) | data[1]; |
| 746 | if ((id & variant->id_mask) != variant->id_val) { |
| 747 | dev_err(stmpe->dev, "unknown chip id: %#x\n", id); |
| 748 | return -EINVAL; |
| 749 | } |
| 750 | |
| 751 | dev_info(stmpe->dev, "%s detected, chip id: %#x\n", variant->name, id); |
| 752 | |
| 753 | /* Disable all modules -- subdrivers should enable what they need. */ |
| 754 | ret = stmpe_disable(stmpe, ~0); |
| 755 | if (ret) |
| 756 | return ret; |
| 757 | |
| 758 | if (irq_trigger == IRQF_TRIGGER_FALLING || |
| 759 | irq_trigger == IRQF_TRIGGER_RISING) |
| 760 | icr |= STMPE_ICR_LSB_EDGE; |
| 761 | |
| 762 | if (irq_trigger == IRQF_TRIGGER_RISING || |
| 763 | irq_trigger == IRQF_TRIGGER_HIGH) |
| 764 | icr |= STMPE_ICR_LSB_HIGH; |
| 765 | |
| 766 | if (stmpe->pdata->irq_invert_polarity) |
| 767 | icr ^= STMPE_ICR_LSB_HIGH; |
| 768 | |
| 769 | return stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_ICR_LSB], icr); |
| 770 | } |
| 771 | |
| 772 | static int __devinit stmpe_add_device(struct stmpe *stmpe, |
| 773 | struct mfd_cell *cell, int irq) |
| 774 | { |
| 775 | return mfd_add_devices(stmpe->dev, stmpe->pdata->id, cell, 1, |
| 776 | NULL, stmpe->irq_base + irq); |
| 777 | } |
| 778 | |
| 779 | static int __devinit stmpe_devices_init(struct stmpe *stmpe) |
| 780 | { |
| 781 | struct stmpe_variant_info *variant = stmpe->variant; |
| 782 | unsigned int platform_blocks = stmpe->pdata->blocks; |
| 783 | int ret = -EINVAL; |
| 784 | int i; |
| 785 | |
| 786 | for (i = 0; i < variant->num_blocks; i++) { |
| 787 | struct stmpe_variant_block *block = &variant->blocks[i]; |
| 788 | |
| 789 | if (!(platform_blocks & block->block)) |
| 790 | continue; |
| 791 | |
| 792 | platform_blocks &= ~block->block; |
| 793 | ret = stmpe_add_device(stmpe, block->cell, block->irq); |
| 794 | if (ret) |
| 795 | return ret; |
| 796 | } |
| 797 | |
| 798 | if (platform_blocks) |
| 799 | dev_warn(stmpe->dev, |
| 800 | "platform wants blocks (%#x) not present on variant", |
| 801 | platform_blocks); |
| 802 | |
| 803 | return ret; |
| 804 | } |
| 805 | |
| 806 | static int __devinit stmpe_probe(struct i2c_client *i2c, |
| 807 | const struct i2c_device_id *id) |
| 808 | { |
| 809 | struct stmpe_platform_data *pdata = i2c->dev.platform_data; |
| 810 | struct stmpe *stmpe; |
| 811 | int ret; |
| 812 | |
| 813 | if (!pdata) |
| 814 | return -EINVAL; |
| 815 | |
| 816 | stmpe = kzalloc(sizeof(struct stmpe), GFP_KERNEL); |
| 817 | if (!stmpe) |
| 818 | return -ENOMEM; |
| 819 | |
| 820 | mutex_init(&stmpe->irq_lock); |
| 821 | mutex_init(&stmpe->lock); |
| 822 | |
| 823 | stmpe->dev = &i2c->dev; |
| 824 | stmpe->i2c = i2c; |
| 825 | |
| 826 | stmpe->pdata = pdata; |
| 827 | stmpe->irq_base = pdata->irq_base; |
| 828 | |
| 829 | stmpe->partnum = id->driver_data; |
| 830 | stmpe->variant = stmpe_variant_info[stmpe->partnum]; |
| 831 | stmpe->regs = stmpe->variant->regs; |
| 832 | stmpe->num_gpios = stmpe->variant->num_gpios; |
| 833 | |
| 834 | i2c_set_clientdata(i2c, stmpe); |
| 835 | |
| 836 | ret = stmpe_chip_init(stmpe); |
| 837 | if (ret) |
| 838 | goto out_free; |
| 839 | |
| 840 | ret = stmpe_irq_init(stmpe); |
| 841 | if (ret) |
| 842 | goto out_free; |
| 843 | |
| 844 | ret = request_threaded_irq(stmpe->i2c->irq, NULL, stmpe_irq, |
| 845 | pdata->irq_trigger | IRQF_ONESHOT, |
| 846 | "stmpe", stmpe); |
| 847 | if (ret) { |
| 848 | dev_err(stmpe->dev, "failed to request IRQ: %d\n", ret); |
| 849 | goto out_removeirq; |
| 850 | } |
| 851 | |
| 852 | ret = stmpe_devices_init(stmpe); |
| 853 | if (ret) { |
| 854 | dev_err(stmpe->dev, "failed to add children\n"); |
| 855 | goto out_removedevs; |
| 856 | } |
| 857 | |
| 858 | return 0; |
| 859 | |
| 860 | out_removedevs: |
| 861 | mfd_remove_devices(stmpe->dev); |
| 862 | free_irq(stmpe->i2c->irq, stmpe); |
| 863 | out_removeirq: |
| 864 | stmpe_irq_remove(stmpe); |
| 865 | out_free: |
| 866 | kfree(stmpe); |
| 867 | return ret; |
| 868 | } |
| 869 | |
| 870 | static int __devexit stmpe_remove(struct i2c_client *client) |
| 871 | { |
| 872 | struct stmpe *stmpe = i2c_get_clientdata(client); |
| 873 | |
| 874 | mfd_remove_devices(stmpe->dev); |
| 875 | |
| 876 | free_irq(stmpe->i2c->irq, stmpe); |
| 877 | stmpe_irq_remove(stmpe); |
| 878 | |
| 879 | kfree(stmpe); |
| 880 | |
| 881 | return 0; |
| 882 | } |
| 883 | |
| 884 | static const struct i2c_device_id stmpe_id[] = { |
| 885 | { "stmpe811", STMPE811 }, |
| 886 | { "stmpe1601", STMPE1601 }, |
| 887 | { "stmpe2401", STMPE2401 }, |
| 888 | { "stmpe2403", STMPE2403 }, |
| 889 | { } |
| 890 | }; |
| 891 | MODULE_DEVICE_TABLE(i2c, stmpe_id); |
| 892 | |
| 893 | static struct i2c_driver stmpe_driver = { |
| 894 | .driver.name = "stmpe", |
| 895 | .driver.owner = THIS_MODULE, |
| 896 | .probe = stmpe_probe, |
| 897 | .remove = __devexit_p(stmpe_remove), |
| 898 | .id_table = stmpe_id, |
| 899 | }; |
| 900 | |
| 901 | static int __init stmpe_init(void) |
| 902 | { |
| 903 | return i2c_add_driver(&stmpe_driver); |
| 904 | } |
| 905 | subsys_initcall(stmpe_init); |
| 906 | |
| 907 | static void __exit stmpe_exit(void) |
| 908 | { |
| 909 | i2c_del_driver(&stmpe_driver); |
| 910 | } |
| 911 | module_exit(stmpe_exit); |
| 912 | |
| 913 | MODULE_LICENSE("GPL v2"); |
| 914 | MODULE_DESCRIPTION("STMPE MFD core driver"); |
| 915 | MODULE_AUTHOR("Rabin Vincent <rabin.vincent@stericsson.com>"); |