1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved. 4 */ 5 6 #include <linux/bitfield.h> 7 #include <linux/bits.h> 8 #include <linux/leds.h> 9 #include <linux/led-class-flash.h> 10 #include <linux/module.h> 11 #include <linux/platform_device.h> 12 #include <linux/property.h> 13 #include <linux/regmap.h> 14 #include <media/v4l2-flash-led-class.h> 15 16 /* registers definitions */ 17 #define FLASH_TYPE_REG 0x04 18 #define FLASH_TYPE_VAL 0x18 19 20 #define FLASH_SUBTYPE_REG 0x05 21 #define FLASH_SUBTYPE_3CH_PM8150_VAL 0x04 22 #define FLASH_SUBTYPE_3CH_PMI8998_VAL 0x03 23 #define FLASH_SUBTYPE_4CH_VAL 0x07 24 25 #define FLASH_STS_3CH_OTST1 BIT(0) 26 #define FLASH_STS_3CH_OTST2 BIT(1) 27 #define FLASH_STS_3CH_OTST3 BIT(2) 28 #define FLASH_STS_3CH_BOB_THM_OVERLOAD BIT(3) 29 #define FLASH_STS_3CH_VPH_DROOP BIT(4) 30 #define FLASH_STS_3CH_BOB_ILIM_S1 BIT(5) 31 #define FLASH_STS_3CH_BOB_ILIM_S2 BIT(6) 32 #define FLASH_STS_3CH_BCL_IBAT BIT(7) 33 34 #define FLASH_STS_4CH_VPH_LOW BIT(0) 35 #define FLASH_STS_4CH_BCL_IBAT BIT(1) 36 #define FLASH_STS_4CH_BOB_ILIM_S1 BIT(2) 37 #define FLASH_STS_4CH_BOB_ILIM_S2 BIT(3) 38 #define FLASH_STS_4CH_OTST2 BIT(4) 39 #define FLASH_STS_4CH_OTST1 BIT(5) 40 #define FLASH_STS_4CHG_BOB_THM_OVERLOAD BIT(6) 41 42 #define FLASH_TIMER_EN_BIT BIT(7) 43 #define FLASH_TIMER_VAL_MASK GENMASK(6, 0) 44 #define FLASH_TIMER_STEP_MS 10 45 46 #define FLASH_STROBE_HW_SW_SEL_BIT BIT(2) 47 #define SW_STROBE_VAL 0 48 #define HW_STROBE_VAL 1 49 #define FLASH_HW_STROBE_TRIGGER_SEL_BIT BIT(1) 50 #define STROBE_LEVEL_TRIGGER_VAL 0 51 #define STROBE_EDGE_TRIGGER_VAL 1 52 #define FLASH_STROBE_POLARITY_BIT BIT(0) 53 #define STROBE_ACTIVE_HIGH_VAL 1 54 55 #define FLASH_IRES_MASK_4CH BIT(0) 56 #define FLASH_IRES_MASK_3CH GENMASK(1, 0) 57 #define FLASH_IRES_12P5MA_VAL 0 58 #define FLASH_IRES_5MA_VAL_4CH 1 59 #define FLASH_IRES_5MA_VAL_3CH 3 60 61 /* constants */ 62 #define FLASH_CURRENT_MAX_UA 1500000 63 #define TORCH_CURRENT_MAX_UA 500000 64 #define FLASH_TOTAL_CURRENT_MAX_UA 2000000 65 #define FLASH_CURRENT_DEFAULT_UA 1000000 66 #define TORCH_CURRENT_DEFAULT_UA 200000 67 68 #define TORCH_IRES_UA 5000 69 #define FLASH_IRES_UA 12500 70 71 #define FLASH_TIMEOUT_MAX_US 1280000 72 #define FLASH_TIMEOUT_STEP_US 10000 73 74 #define UA_PER_MA 1000 75 76 enum hw_type { 77 QCOM_MVFLASH_3CH, 78 QCOM_MVFLASH_4CH, 79 }; 80 81 enum led_mode { 82 FLASH_MODE, 83 TORCH_MODE, 84 }; 85 86 enum led_strobe { 87 SW_STROBE, 88 HW_STROBE, 89 }; 90 91 enum { 92 REG_STATUS1, 93 REG_STATUS2, 94 REG_STATUS3, 95 REG_CHAN_TIMER, 96 REG_ITARGET, 97 REG_MODULE_EN, 98 REG_IRESOLUTION, 99 REG_CHAN_STROBE, 100 REG_CHAN_EN, 101 REG_MAX_COUNT, 102 }; 103 104 static struct reg_field mvflash_3ch_regs[REG_MAX_COUNT] = { 105 REG_FIELD(0x08, 0, 7), /* status1 */ 106 REG_FIELD(0x09, 0, 7), /* status2 */ 107 REG_FIELD(0x0a, 0, 7), /* status3 */ 108 REG_FIELD_ID(0x40, 0, 7, 3, 1), /* chan_timer */ 109 REG_FIELD_ID(0x43, 0, 6, 3, 1), /* itarget */ 110 REG_FIELD(0x46, 7, 7), /* module_en */ 111 REG_FIELD(0x47, 0, 5), /* iresolution */ 112 REG_FIELD_ID(0x49, 0, 2, 3, 1), /* chan_strobe */ 113 REG_FIELD(0x4c, 0, 2), /* chan_en */ 114 }; 115 116 static struct reg_field mvflash_4ch_regs[REG_MAX_COUNT] = { 117 REG_FIELD(0x06, 0, 7), /* status1 */ 118 REG_FIELD(0x07, 0, 6), /* status2 */ 119 REG_FIELD(0x09, 0, 7), /* status3 */ 120 REG_FIELD_ID(0x3e, 0, 7, 4, 1), /* chan_timer */ 121 REG_FIELD_ID(0x42, 0, 6, 4, 1), /* itarget */ 122 REG_FIELD(0x46, 7, 7), /* module_en */ 123 REG_FIELD(0x49, 0, 3), /* iresolution */ 124 REG_FIELD_ID(0x4a, 0, 6, 4, 1), /* chan_strobe */ 125 REG_FIELD(0x4e, 0, 3), /* chan_en */ 126 }; 127 128 struct qcom_flash_data { 129 struct v4l2_flash **v4l2_flash; 130 struct regmap_field *r_fields[REG_MAX_COUNT]; 131 struct mutex lock; 132 enum hw_type hw_type; 133 u8 leds_count; 134 u8 max_channels; 135 u8 chan_en_bits; 136 }; 137 138 struct qcom_flash_led { 139 struct qcom_flash_data *flash_data; 140 struct led_classdev_flash flash; 141 u32 max_flash_current_ma; 142 u32 max_torch_current_ma; 143 u32 max_timeout_ms; 144 u32 flash_current_ma; 145 u32 flash_timeout_ms; 146 u8 *chan_id; 147 u8 chan_count; 148 bool enabled; 149 }; 150 151 static int set_flash_module_en(struct qcom_flash_led *led, bool en) 152 { 153 struct qcom_flash_data *flash_data = led->flash_data; 154 u8 led_mask = 0, enable; 155 int i, rc; 156 157 for (i = 0; i < led->chan_count; i++) 158 led_mask |= BIT(led->chan_id[i]); 159 160 mutex_lock(&flash_data->lock); 161 if (en) 162 flash_data->chan_en_bits |= led_mask; 163 else 164 flash_data->chan_en_bits &= ~led_mask; 165 166 enable = !!flash_data->chan_en_bits; 167 rc = regmap_field_write(flash_data->r_fields[REG_MODULE_EN], enable); 168 if (rc) 169 dev_err(led->flash.led_cdev.dev, "write module_en failed, rc=%d\n", rc); 170 mutex_unlock(&flash_data->lock); 171 172 return rc; 173 } 174 175 static int set_flash_current(struct qcom_flash_led *led, u32 current_ma, enum led_mode mode) 176 { 177 struct qcom_flash_data *flash_data = led->flash_data; 178 u32 itarg_ua, ires_ua; 179 u8 shift, ires_mask = 0, ires_val = 0, chan_id; 180 int i, rc; 181 182 /* 183 * Split the current across the channels and set the 184 * IRESOLUTION and ITARGET registers accordingly. 185 */ 186 itarg_ua = (current_ma * UA_PER_MA) / led->chan_count + 1; 187 ires_ua = (mode == FLASH_MODE) ? FLASH_IRES_UA : TORCH_IRES_UA; 188 189 for (i = 0; i < led->chan_count; i++) { 190 u8 itarget = 0; 191 192 if (itarg_ua > ires_ua) 193 itarget = itarg_ua / ires_ua - 1; 194 195 chan_id = led->chan_id[i]; 196 197 rc = regmap_fields_write(flash_data->r_fields[REG_ITARGET], chan_id, itarget); 198 if (rc) 199 return rc; 200 201 if (flash_data->hw_type == QCOM_MVFLASH_3CH) { 202 shift = chan_id * 2; 203 ires_mask |= FLASH_IRES_MASK_3CH << shift; 204 ires_val |= ((mode == FLASH_MODE) ? 205 (FLASH_IRES_12P5MA_VAL << shift) : 206 (FLASH_IRES_5MA_VAL_3CH << shift)); 207 } else if (flash_data->hw_type == QCOM_MVFLASH_4CH) { 208 shift = chan_id; 209 ires_mask |= FLASH_IRES_MASK_4CH << shift; 210 ires_val |= ((mode == FLASH_MODE) ? 211 (FLASH_IRES_12P5MA_VAL << shift) : 212 (FLASH_IRES_5MA_VAL_4CH << shift)); 213 } else { 214 dev_err(led->flash.led_cdev.dev, 215 "HW type %d is not supported\n", flash_data->hw_type); 216 return -EOPNOTSUPP; 217 } 218 } 219 220 return regmap_field_update_bits(flash_data->r_fields[REG_IRESOLUTION], ires_mask, ires_val); 221 } 222 223 static int set_flash_timeout(struct qcom_flash_led *led, u32 timeout_ms) 224 { 225 struct qcom_flash_data *flash_data = led->flash_data; 226 u8 timer, chan_id; 227 int rc, i; 228 229 /* set SAFETY_TIMER for all the channels connected to the same LED */ 230 timeout_ms = min_t(u32, timeout_ms, led->max_timeout_ms); 231 232 for (i = 0; i < led->chan_count; i++) { 233 chan_id = led->chan_id[i]; 234 235 timer = timeout_ms / FLASH_TIMER_STEP_MS; 236 timer = clamp_t(u8, timer, 0, FLASH_TIMER_VAL_MASK); 237 238 if (timeout_ms) 239 timer |= FLASH_TIMER_EN_BIT; 240 241 rc = regmap_fields_write(flash_data->r_fields[REG_CHAN_TIMER], chan_id, timer); 242 if (rc) 243 return rc; 244 } 245 246 return 0; 247 } 248 249 static int set_flash_strobe(struct qcom_flash_led *led, enum led_strobe strobe, bool state) 250 { 251 struct qcom_flash_data *flash_data = led->flash_data; 252 u8 strobe_sel, chan_en, chan_id, chan_mask = 0; 253 int rc, i; 254 255 /* Set SW strobe config for all channels connected to the LED */ 256 for (i = 0; i < led->chan_count; i++) { 257 chan_id = led->chan_id[i]; 258 259 if (strobe == SW_STROBE) 260 strobe_sel = FIELD_PREP(FLASH_STROBE_HW_SW_SEL_BIT, SW_STROBE_VAL); 261 else 262 strobe_sel = FIELD_PREP(FLASH_STROBE_HW_SW_SEL_BIT, HW_STROBE_VAL); 263 264 strobe_sel |= 265 FIELD_PREP(FLASH_HW_STROBE_TRIGGER_SEL_BIT, STROBE_LEVEL_TRIGGER_VAL) | 266 FIELD_PREP(FLASH_STROBE_POLARITY_BIT, STROBE_ACTIVE_HIGH_VAL); 267 268 rc = regmap_fields_write( 269 flash_data->r_fields[REG_CHAN_STROBE], chan_id, strobe_sel); 270 if (rc) 271 return rc; 272 273 chan_mask |= BIT(chan_id); 274 } 275 276 /* Enable/disable flash channels */ 277 chan_en = state ? chan_mask : 0; 278 rc = regmap_field_update_bits(flash_data->r_fields[REG_CHAN_EN], chan_mask, chan_en); 279 if (rc) 280 return rc; 281 282 led->enabled = state; 283 return 0; 284 } 285 286 static inline struct qcom_flash_led *flcdev_to_qcom_fled(struct led_classdev_flash *flcdev) 287 { 288 return container_of(flcdev, struct qcom_flash_led, flash); 289 } 290 291 static int qcom_flash_brightness_set(struct led_classdev_flash *fled_cdev, u32 brightness) 292 { 293 struct qcom_flash_led *led = flcdev_to_qcom_fled(fled_cdev); 294 295 led->flash_current_ma = min_t(u32, led->max_flash_current_ma, brightness / UA_PER_MA); 296 return 0; 297 } 298 299 static int qcom_flash_timeout_set(struct led_classdev_flash *fled_cdev, u32 timeout) 300 { 301 struct qcom_flash_led *led = flcdev_to_qcom_fled(fled_cdev); 302 303 led->flash_timeout_ms = timeout / USEC_PER_MSEC; 304 return 0; 305 } 306 307 static int qcom_flash_strobe_set(struct led_classdev_flash *fled_cdev, bool state) 308 { 309 struct qcom_flash_led *led = flcdev_to_qcom_fled(fled_cdev); 310 int rc; 311 312 rc = set_flash_current(led, led->flash_current_ma, FLASH_MODE); 313 if (rc) 314 return rc; 315 316 rc = set_flash_timeout(led, led->flash_timeout_ms); 317 if (rc) 318 return rc; 319 320 rc = set_flash_module_en(led, state); 321 if (rc) 322 return rc; 323 324 return set_flash_strobe(led, SW_STROBE, state); 325 } 326 327 static int qcom_flash_strobe_get(struct led_classdev_flash *fled_cdev, bool *state) 328 { 329 struct qcom_flash_led *led = flcdev_to_qcom_fled(fled_cdev); 330 331 *state = led->enabled; 332 return 0; 333 } 334 335 static int qcom_flash_fault_get(struct led_classdev_flash *fled_cdev, u32 *fault) 336 { 337 struct qcom_flash_led *led = flcdev_to_qcom_fled(fled_cdev); 338 struct qcom_flash_data *flash_data = led->flash_data; 339 u8 shift, chan_id, chan_mask = 0; 340 u8 ot_mask = 0, oc_mask = 0, uv_mask = 0; 341 u32 val, fault_sts = 0; 342 int i, rc; 343 344 rc = regmap_field_read(flash_data->r_fields[REG_STATUS1], &val); 345 if (rc) 346 return rc; 347 348 for (i = 0; i < led->chan_count; i++) { 349 chan_id = led->chan_id[i]; 350 shift = chan_id * 2; 351 352 if (val & BIT(shift)) 353 fault_sts |= LED_FAULT_SHORT_CIRCUIT; 354 355 chan_mask |= BIT(chan_id); 356 } 357 358 rc = regmap_field_read(flash_data->r_fields[REG_STATUS2], &val); 359 if (rc) 360 return rc; 361 362 if (flash_data->hw_type == QCOM_MVFLASH_3CH) { 363 ot_mask = FLASH_STS_3CH_OTST1 | 364 FLASH_STS_3CH_OTST2 | 365 FLASH_STS_3CH_OTST3 | 366 FLASH_STS_3CH_BOB_THM_OVERLOAD; 367 oc_mask = FLASH_STS_3CH_BOB_ILIM_S1 | 368 FLASH_STS_3CH_BOB_ILIM_S2 | 369 FLASH_STS_3CH_BCL_IBAT; 370 uv_mask = FLASH_STS_3CH_VPH_DROOP; 371 } else if (flash_data->hw_type == QCOM_MVFLASH_4CH) { 372 ot_mask = FLASH_STS_4CH_OTST2 | 373 FLASH_STS_4CH_OTST1 | 374 FLASH_STS_4CHG_BOB_THM_OVERLOAD; 375 oc_mask = FLASH_STS_4CH_BCL_IBAT | 376 FLASH_STS_4CH_BOB_ILIM_S1 | 377 FLASH_STS_4CH_BOB_ILIM_S2; 378 uv_mask = FLASH_STS_4CH_VPH_LOW; 379 } 380 381 if (val & ot_mask) 382 fault_sts |= LED_FAULT_OVER_TEMPERATURE; 383 384 if (val & oc_mask) 385 fault_sts |= LED_FAULT_OVER_CURRENT; 386 387 if (val & uv_mask) 388 fault_sts |= LED_FAULT_INPUT_VOLTAGE; 389 390 rc = regmap_field_read(flash_data->r_fields[REG_STATUS3], &val); 391 if (rc) 392 return rc; 393 394 if (flash_data->hw_type == QCOM_MVFLASH_3CH) { 395 if (val & chan_mask) 396 fault_sts |= LED_FAULT_TIMEOUT; 397 } else if (flash_data->hw_type == QCOM_MVFLASH_4CH) { 398 for (i = 0; i < led->chan_count; i++) { 399 chan_id = led->chan_id[i]; 400 shift = chan_id * 2; 401 402 if (val & BIT(shift)) 403 fault_sts |= LED_FAULT_TIMEOUT; 404 } 405 } 406 407 *fault = fault_sts; 408 return 0; 409 } 410 411 static int qcom_flash_led_brightness_set(struct led_classdev *led_cdev, 412 enum led_brightness brightness) 413 { 414 struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev); 415 struct qcom_flash_led *led = flcdev_to_qcom_fled(fled_cdev); 416 u32 current_ma = brightness * led->max_torch_current_ma / LED_FULL; 417 bool enable = !!brightness; 418 int rc; 419 420 rc = set_flash_strobe(led, SW_STROBE, false); 421 if (rc) 422 return rc; 423 424 rc = set_flash_module_en(led, false); 425 if (rc) 426 return rc; 427 428 rc = set_flash_current(led, current_ma, TORCH_MODE); 429 if (rc) 430 return rc; 431 432 /* Disable flash timeout for torch LED */ 433 rc = set_flash_timeout(led, 0); 434 if (rc) 435 return rc; 436 437 rc = set_flash_module_en(led, enable); 438 if (rc) 439 return rc; 440 441 return set_flash_strobe(led, SW_STROBE, enable); 442 } 443 444 static const struct led_flash_ops qcom_flash_ops = { 445 .flash_brightness_set = qcom_flash_brightness_set, 446 .strobe_set = qcom_flash_strobe_set, 447 .strobe_get = qcom_flash_strobe_get, 448 .timeout_set = qcom_flash_timeout_set, 449 .fault_get = qcom_flash_fault_get, 450 }; 451 452 #if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS) 453 static int qcom_flash_external_strobe_set(struct v4l2_flash *v4l2_flash, bool enable) 454 { 455 struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev; 456 struct qcom_flash_led *led = flcdev_to_qcom_fled(fled_cdev); 457 int rc; 458 459 rc = set_flash_module_en(led, enable); 460 if (rc) 461 return rc; 462 463 if (enable) 464 return set_flash_strobe(led, HW_STROBE, true); 465 else 466 return set_flash_strobe(led, SW_STROBE, false); 467 } 468 469 static enum led_brightness 470 qcom_flash_intensity_to_led_brightness(struct v4l2_flash *v4l2_flash, s32 intensity) 471 { 472 struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev; 473 struct qcom_flash_led *led = flcdev_to_qcom_fled(fled_cdev); 474 u32 current_ma = intensity / UA_PER_MA; 475 476 current_ma = min_t(u32, current_ma, led->max_torch_current_ma); 477 if (!current_ma) 478 return LED_OFF; 479 480 return (current_ma * LED_FULL) / led->max_torch_current_ma; 481 } 482 483 static s32 qcom_flash_brightness_to_led_intensity(struct v4l2_flash *v4l2_flash, 484 enum led_brightness brightness) 485 { 486 struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev; 487 struct qcom_flash_led *led = flcdev_to_qcom_fled(fled_cdev); 488 489 return (brightness * led->max_torch_current_ma * UA_PER_MA) / LED_FULL; 490 } 491 492 static const struct v4l2_flash_ops qcom_v4l2_flash_ops = { 493 .external_strobe_set = qcom_flash_external_strobe_set, 494 .intensity_to_led_brightness = qcom_flash_intensity_to_led_brightness, 495 .led_brightness_to_intensity = qcom_flash_brightness_to_led_intensity, 496 }; 497 498 static int 499 qcom_flash_v4l2_init(struct device *dev, struct qcom_flash_led *led, struct fwnode_handle *fwnode) 500 { 501 struct qcom_flash_data *flash_data = led->flash_data; 502 struct v4l2_flash_config v4l2_cfg = { 0 }; 503 struct led_flash_setting *intensity = &v4l2_cfg.intensity; 504 505 if (!(led->flash.led_cdev.flags & LED_DEV_CAP_FLASH)) 506 return 0; 507 508 intensity->min = intensity->step = TORCH_IRES_UA * led->chan_count; 509 intensity->max = led->max_torch_current_ma * UA_PER_MA; 510 intensity->val = min_t(u32, intensity->max, TORCH_CURRENT_DEFAULT_UA); 511 512 strscpy(v4l2_cfg.dev_name, led->flash.led_cdev.dev->kobj.name, 513 sizeof(v4l2_cfg.dev_name)); 514 515 v4l2_cfg.has_external_strobe = true; 516 v4l2_cfg.flash_faults = LED_FAULT_INPUT_VOLTAGE | 517 LED_FAULT_OVER_CURRENT | 518 LED_FAULT_SHORT_CIRCUIT | 519 LED_FAULT_OVER_TEMPERATURE | 520 LED_FAULT_TIMEOUT; 521 522 flash_data->v4l2_flash[flash_data->leds_count] = 523 v4l2_flash_init(dev, fwnode, &led->flash, &qcom_v4l2_flash_ops, &v4l2_cfg); 524 return PTR_ERR_OR_ZERO(flash_data->v4l2_flash); 525 } 526 # else 527 static int 528 qcom_flash_v4l2_init(struct device *dev, struct qcom_flash_led *led, struct fwnode_handle *fwnode) 529 { 530 return 0; 531 } 532 #endif 533 534 static int qcom_flash_register_led_device(struct device *dev, 535 struct fwnode_handle *node, struct qcom_flash_led *led) 536 { 537 struct qcom_flash_data *flash_data = led->flash_data; 538 struct led_init_data init_data; 539 struct led_classdev_flash *flash = &led->flash; 540 struct led_flash_setting *brightness, *timeout; 541 u32 current_ua, timeout_us; 542 u32 channels[4]; 543 int i, rc, count; 544 545 count = fwnode_property_count_u32(node, "led-sources"); 546 if (count <= 0) { 547 dev_err(dev, "No led-sources specified\n"); 548 return -ENODEV; 549 } 550 551 if (count > flash_data->max_channels) { 552 dev_err(dev, "led-sources count %u exceeds maximum channel count %u\n", 553 count, flash_data->max_channels); 554 return -EINVAL; 555 } 556 557 rc = fwnode_property_read_u32_array(node, "led-sources", channels, count); 558 if (rc < 0) { 559 dev_err(dev, "Failed to read led-sources property, rc=%d\n", rc); 560 return rc; 561 } 562 563 led->chan_count = count; 564 led->chan_id = devm_kcalloc(dev, count, sizeof(u8), GFP_KERNEL); 565 if (!led->chan_id) 566 return -ENOMEM; 567 568 for (i = 0; i < count; i++) { 569 if ((channels[i] == 0) || (channels[i] > flash_data->max_channels)) { 570 dev_err(dev, "led-source out of HW support range [1-%u]\n", 571 flash_data->max_channels); 572 return -EINVAL; 573 } 574 575 /* Make chan_id indexing from 0 */ 576 led->chan_id[i] = channels[i] - 1; 577 } 578 579 rc = fwnode_property_read_u32(node, "led-max-microamp", ¤t_ua); 580 if (rc < 0) { 581 dev_err(dev, "Failed to read led-max-microamp property, rc=%d\n", rc); 582 return rc; 583 } 584 585 if (current_ua == 0) { 586 dev_err(dev, "led-max-microamp shouldn't be 0\n"); 587 return -EINVAL; 588 } 589 590 current_ua = min_t(u32, current_ua, TORCH_CURRENT_MAX_UA * led->chan_count); 591 led->max_torch_current_ma = current_ua / UA_PER_MA; 592 593 if (fwnode_property_present(node, "flash-max-microamp")) { 594 flash->led_cdev.flags |= LED_DEV_CAP_FLASH; 595 596 rc = fwnode_property_read_u32(node, "flash-max-microamp", ¤t_ua); 597 if (rc < 0) { 598 dev_err(dev, "Failed to read flash-max-microamp property, rc=%d\n", 599 rc); 600 return rc; 601 } 602 603 current_ua = min_t(u32, current_ua, FLASH_CURRENT_MAX_UA * led->chan_count); 604 current_ua = min_t(u32, current_ua, FLASH_TOTAL_CURRENT_MAX_UA); 605 606 /* Initialize flash class LED device brightness settings */ 607 brightness = &flash->brightness; 608 brightness->min = brightness->step = FLASH_IRES_UA * led->chan_count; 609 brightness->max = current_ua; 610 brightness->val = min_t(u32, current_ua, FLASH_CURRENT_DEFAULT_UA); 611 612 led->max_flash_current_ma = current_ua / UA_PER_MA; 613 led->flash_current_ma = brightness->val / UA_PER_MA; 614 615 rc = fwnode_property_read_u32(node, "flash-max-timeout-us", &timeout_us); 616 if (rc < 0) { 617 dev_err(dev, "Failed to read flash-max-timeout-us property, rc=%d\n", 618 rc); 619 return rc; 620 } 621 622 timeout_us = min_t(u32, timeout_us, FLASH_TIMEOUT_MAX_US); 623 624 /* Initialize flash class LED device timeout settings */ 625 timeout = &flash->timeout; 626 timeout->min = timeout->step = FLASH_TIMEOUT_STEP_US; 627 timeout->val = timeout->max = timeout_us; 628 629 led->max_timeout_ms = led->flash_timeout_ms = timeout_us / USEC_PER_MSEC; 630 631 flash->ops = &qcom_flash_ops; 632 } 633 634 flash->led_cdev.brightness_set_blocking = qcom_flash_led_brightness_set; 635 636 init_data.fwnode = node; 637 init_data.devicename = NULL; 638 init_data.default_label = NULL; 639 init_data.devname_mandatory = false; 640 641 rc = devm_led_classdev_flash_register_ext(dev, flash, &init_data); 642 if (rc < 0) { 643 dev_err(dev, "Register flash LED classdev failed, rc=%d\n", rc); 644 return rc; 645 } 646 647 return qcom_flash_v4l2_init(dev, led, node); 648 } 649 650 static int qcom_flash_led_probe(struct platform_device *pdev) 651 { 652 struct qcom_flash_data *flash_data; 653 struct qcom_flash_led *led; 654 struct fwnode_handle *child; 655 struct device *dev = &pdev->dev; 656 struct regmap *regmap; 657 struct reg_field *regs; 658 int count, i, rc; 659 u32 val, reg_base; 660 661 flash_data = devm_kzalloc(dev, sizeof(*flash_data), GFP_KERNEL); 662 if (!flash_data) 663 return -ENOMEM; 664 665 regmap = dev_get_regmap(dev->parent, NULL); 666 if (!regmap) { 667 dev_err(dev, "Failed to get parent regmap\n"); 668 return -EINVAL; 669 } 670 671 rc = fwnode_property_read_u32(dev->fwnode, "reg", ®_base); 672 if (rc < 0) { 673 dev_err(dev, "Failed to get register base address, rc=%d\n", rc); 674 return rc; 675 } 676 677 rc = regmap_read(regmap, reg_base + FLASH_TYPE_REG, &val); 678 if (rc < 0) { 679 dev_err(dev, "Read flash LED module type failed, rc=%d\n", rc); 680 return rc; 681 } 682 683 if (val != FLASH_TYPE_VAL) { 684 dev_err(dev, "type %#x is not a flash LED module\n", val); 685 return -ENODEV; 686 } 687 688 rc = regmap_read(regmap, reg_base + FLASH_SUBTYPE_REG, &val); 689 if (rc < 0) { 690 dev_err(dev, "Read flash LED module subtype failed, rc=%d\n", rc); 691 return rc; 692 } 693 694 if (val == FLASH_SUBTYPE_3CH_PM8150_VAL || val == FLASH_SUBTYPE_3CH_PMI8998_VAL) { 695 flash_data->hw_type = QCOM_MVFLASH_3CH; 696 flash_data->max_channels = 3; 697 regs = mvflash_3ch_regs; 698 } else if (val == FLASH_SUBTYPE_4CH_VAL) { 699 flash_data->hw_type = QCOM_MVFLASH_4CH; 700 flash_data->max_channels = 4; 701 regs = mvflash_4ch_regs; 702 } else { 703 dev_err(dev, "flash LED subtype %#x is not yet supported\n", val); 704 return -ENODEV; 705 } 706 707 for (i = 0; i < REG_MAX_COUNT; i++) 708 regs[i].reg += reg_base; 709 710 rc = devm_regmap_field_bulk_alloc(dev, regmap, flash_data->r_fields, regs, REG_MAX_COUNT); 711 if (rc < 0) { 712 dev_err(dev, "Failed to allocate regmap field, rc=%d\n", rc); 713 return rc; 714 } 715 716 platform_set_drvdata(pdev, flash_data); 717 mutex_init(&flash_data->lock); 718 719 count = device_get_child_node_count(dev); 720 if (count == 0 || count > flash_data->max_channels) { 721 dev_err(dev, "No child or child count exceeds %d\n", flash_data->max_channels); 722 return -EINVAL; 723 } 724 725 flash_data->v4l2_flash = devm_kcalloc(dev, count, 726 sizeof(*flash_data->v4l2_flash), GFP_KERNEL); 727 if (!flash_data->v4l2_flash) 728 return -ENOMEM; 729 730 device_for_each_child_node(dev, child) { 731 led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL); 732 if (!led) { 733 rc = -ENOMEM; 734 goto release; 735 } 736 737 led->flash_data = flash_data; 738 rc = qcom_flash_register_led_device(dev, child, led); 739 if (rc < 0) 740 goto release; 741 742 flash_data->leds_count++; 743 } 744 745 return 0; 746 747 release: 748 while (flash_data->v4l2_flash[flash_data->leds_count] && flash_data->leds_count) 749 v4l2_flash_release(flash_data->v4l2_flash[flash_data->leds_count--]); 750 return rc; 751 } 752 753 static int qcom_flash_led_remove(struct platform_device *pdev) 754 { 755 struct qcom_flash_data *flash_data = platform_get_drvdata(pdev); 756 757 while (flash_data->v4l2_flash[flash_data->leds_count] && flash_data->leds_count) 758 v4l2_flash_release(flash_data->v4l2_flash[flash_data->leds_count--]); 759 760 mutex_destroy(&flash_data->lock); 761 return 0; 762 } 763 764 static const struct of_device_id qcom_flash_led_match_table[] = { 765 { .compatible = "qcom,spmi-flash-led" }, 766 { } 767 }; 768 769 MODULE_DEVICE_TABLE(of, qcom_flash_led_match_table); 770 static struct platform_driver qcom_flash_led_driver = { 771 .driver = { 772 .name = "leds-qcom-flash", 773 .of_match_table = qcom_flash_led_match_table, 774 }, 775 .probe = qcom_flash_led_probe, 776 .remove = qcom_flash_led_remove, 777 }; 778 779 module_platform_driver(qcom_flash_led_driver); 780 781 MODULE_DESCRIPTION("QCOM Flash LED driver"); 782 MODULE_LICENSE("GPL"); 783