drivers/leds/leds-as3645a.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * drivers/leds/leds-as3645a.c - AS3645A and LM3555 flash controllers driver
   4  *
   5  * Copyright (C) 2008-2011 Nokia Corporation
   6  * Copyright (c) 2011, 2017 Intel Corporation.
   7  *
   8  * Based on drivers/media/i2c/as3645a.c.
   9  *
  10  * Contact: Sakari Ailus <sakari.ailus@iki.fi>
  11  */
  12
  13 #include <linux/delay.h>
  14 #include <linux/gpio/consumer.h>
  15 #include <linux/i2c.h>
  16 #include <linux/led-class-flash.h>
  17 #include <linux/leds.h>
  18 #include <linux/module.h>
  19 #include <linux/mutex.h>
  20 #include <linux/property.h>
  21 #include <linux/slab.h>
  22
  23 #include <media/v4l2-flash-led-class.h>
  24
  25 #define AS_TIMER_US_TO_CODE(t)                  (((t) / 1000 - 100) / 50)
  26 #define AS_TIMER_CODE_TO_US(c)                  ((50 * (c) + 100) * 1000)
  27
  28 /* Register definitions */
  29
  30 /* Read-only Design info register: Reset state: xxxx 0001 */
  31 #define AS_DESIGN_INFO_REG                      0x00
  32 #define AS_DESIGN_INFO_FACTORY(x)               (((x) >> 4))
  33 #define AS_DESIGN_INFO_MODEL(x)                 ((x) & 0x0f)
  34
  35 /* Read-only Version control register: Reset state: 0000 0000
  36  * for first engineering samples
  37  */
  38 #define AS_VERSION_CONTROL_REG                  0x01
  39 #define AS_VERSION_CONTROL_RFU(x)               (((x) >> 4))
  40 #define AS_VERSION_CONTROL_VERSION(x)           ((x) & 0x0f)
  41
  42 /* Read / Write (Indicator and timer register): Reset state: 0000 1111 */
  43 #define AS_INDICATOR_AND_TIMER_REG              0x02
  44 #define AS_INDICATOR_AND_TIMER_TIMEOUT_SHIFT    0
  45 #define AS_INDICATOR_AND_TIMER_VREF_SHIFT       4
  46 #define AS_INDICATOR_AND_TIMER_INDICATOR_SHIFT  6
  47
  48 /* Read / Write (Current set register): Reset state: 0110 1001 */
  49 #define AS_CURRENT_SET_REG                      0x03
  50 #define AS_CURRENT_ASSIST_LIGHT_SHIFT           0
  51 #define AS_CURRENT_LED_DET_ON                   (1 << 3)
  52 #define AS_CURRENT_FLASH_CURRENT_SHIFT          4
  53
  54 /* Read / Write (Control register): Reset state: 1011 0100 */
  55 #define AS_CONTROL_REG                          0x04
  56 #define AS_CONTROL_MODE_SETTING_SHIFT           0
  57 #define AS_CONTROL_STROBE_ON                    (1 << 2)
  58 #define AS_CONTROL_OUT_ON                       (1 << 3)
  59 #define AS_CONTROL_EXT_TORCH_ON                 (1 << 4)
  60 #define AS_CONTROL_STROBE_TYPE_EDGE             (0 << 5)
  61 #define AS_CONTROL_STROBE_TYPE_LEVEL            (1 << 5)
  62 #define AS_CONTROL_COIL_PEAK_SHIFT              6
  63
  64 /* Read only (D3 is read / write) (Fault and info): Reset state: 0000 x000 */
  65 #define AS_FAULT_INFO_REG                       0x05
  66 #define AS_FAULT_INFO_INDUCTOR_PEAK_LIMIT       (1 << 1)
  67 #define AS_FAULT_INFO_INDICATOR_LED             (1 << 2)
  68 #define AS_FAULT_INFO_LED_AMOUNT                (1 << 3)
  69 #define AS_FAULT_INFO_TIMEOUT                   (1 << 4)
  70 #define AS_FAULT_INFO_OVER_TEMPERATURE          (1 << 5)
  71 #define AS_FAULT_INFO_SHORT_CIRCUIT             (1 << 6)
  72 #define AS_FAULT_INFO_OVER_VOLTAGE              (1 << 7)
  73
  74 /* Boost register */
  75 #define AS_BOOST_REG                            0x0d
  76 #define AS_BOOST_CURRENT_DISABLE                (0 << 0)
  77 #define AS_BOOST_CURRENT_ENABLE                 (1 << 0)
  78
  79 /* Password register is used to unlock boost register writing */
  80 #define AS_PASSWORD_REG                         0x0f
  81 #define AS_PASSWORD_UNLOCK_VALUE                0x55
  82
  83 #define AS_NAME                                 "as3645a"
  84 #define AS_I2C_ADDR                             (0x60 >> 1) /* W:0x60, R:0x61 */
  85
  86 #define AS_FLASH_TIMEOUT_MIN                    100000  /* us */
  87 #define AS_FLASH_TIMEOUT_MAX                    850000
  88 #define AS_FLASH_TIMEOUT_STEP                   50000
  89
  90 #define AS_FLASH_INTENSITY_MIN                  200000  /* uA */
  91 #define AS_FLASH_INTENSITY_MAX_1LED             500000
  92 #define AS_FLASH_INTENSITY_MAX_2LEDS            400000
  93 #define AS_FLASH_INTENSITY_STEP                 20000
  94
  95 #define AS_TORCH_INTENSITY_MIN                  20000   /* uA */
  96 #define AS_TORCH_INTENSITY_MAX                  160000
  97 #define AS_TORCH_INTENSITY_STEP                 20000
  98
  99 #define AS_INDICATOR_INTENSITY_MIN              0       /* uA */
 100 #define AS_INDICATOR_INTENSITY_MAX              10000
 101 #define AS_INDICATOR_INTENSITY_STEP             2500
 102
 103 #define AS_PEAK_mA_MAX                          2000
 104 #define AS_PEAK_mA_TO_REG(a) \
 105         ((min_t(u32, AS_PEAK_mA_MAX, a) - 1250) / 250)
 106
 107 /* LED numbers for Devicetree */
 108 #define AS_LED_FLASH                            0
 109 #define AS_LED_INDICATOR                        1
 110
 111 enum as_mode {
 112         AS_MODE_EXT_TORCH = 0 << AS_CONTROL_MODE_SETTING_SHIFT,
 113         AS_MODE_INDICATOR = 1 << AS_CONTROL_MODE_SETTING_SHIFT,
 114         AS_MODE_ASSIST = 2 << AS_CONTROL_MODE_SETTING_SHIFT,
 115         AS_MODE_FLASH = 3 << AS_CONTROL_MODE_SETTING_SHIFT,
 116 };
 117
 118 struct as3645a_config {
 119         u32 flash_timeout_us;
 120         u32 flash_max_ua;
 121         u32 assist_max_ua;
 122         u32 indicator_max_ua;
 123         u32 voltage_reference;
 124         u32 peak;
 125 };
 126
 127 struct as3645a_names {
 128         char flash[32];
 129         char indicator[32];
 130 };
 131
 132 struct as3645a {
 133         struct i2c_client *client;
 134
 135         struct mutex mutex;
 136
 137         struct led_classdev_flash fled;
 138         struct led_classdev iled_cdev;
 139
 140         struct v4l2_flash *vf;
 141         struct v4l2_flash *vfind;
 142
 143         struct fwnode_handle *flash_node;
 144         struct fwnode_handle *indicator_node;
 145
 146         struct as3645a_config cfg;
 147
 148         enum as_mode mode;
 149         unsigned int timeout;
 150         unsigned int flash_current;
 151         unsigned int assist_current;
 152         unsigned int indicator_current;
 153         enum v4l2_flash_strobe_source strobe_source;
 154 };
 155
 156 #define fled_to_as3645a(__fled) container_of(__fled, struct as3645a, fled)
 157 #define iled_cdev_to_as3645a(__iled_cdev) \
 158         container_of(__iled_cdev, struct as3645a, iled_cdev)
 159
 160 /* Return negative errno else zero on success */
 161 static int as3645a_write(struct as3645a *flash, u8 addr, u8 val)
 162 {
 163         struct i2c_client *client = flash->client;
 164         int rval;
 165
 166         rval = i2c_smbus_write_byte_data(client, addr, val);
 167
 168         dev_dbg(&client->dev, "Write Addr:%02X Val:%02X %s\n", addr, val,
 169                 rval < 0 ? "fail" : "ok");
 170
 171         return rval;
 172 }
 173
 174 /* Return negative errno else a data byte received from the device. */
 175 static int as3645a_read(struct as3645a *flash, u8 addr)
 176 {
 177         struct i2c_client *client = flash->client;
 178         int rval;
 179
 180         rval = i2c_smbus_read_byte_data(client, addr);
 181
 182         dev_dbg(&client->dev, "Read Addr:%02X Val:%02X %s\n", addr, rval,
 183                 rval < 0 ? "fail" : "ok");
 184
 185         return rval;
 186 }
 187
 188 /* -----------------------------------------------------------------------------
 189  * Hardware configuration and trigger
 190  */
 191
 192 /**
 193  * as3645a_set_config - Set flash configuration registers
 194  * @flash: The flash
 195  *
 196  * Configure the hardware with flash, assist and indicator currents, as well as
 197  * flash timeout.
 198  *
 199  * Return 0 on success, or a negative error code if an I2C communication error
 200  * occurred.
 201  */
 202 static int as3645a_set_current(struct as3645a *flash)
 203 {
 204         u8 val;
 205
 206         val = (flash->flash_current << AS_CURRENT_FLASH_CURRENT_SHIFT)
 207             | (flash->assist_current << AS_CURRENT_ASSIST_LIGHT_SHIFT)
 208             | AS_CURRENT_LED_DET_ON;
 209
 210         return as3645a_write(flash, AS_CURRENT_SET_REG, val);
 211 }
 212
 213 static int as3645a_set_timeout(struct as3645a *flash)
 214 {
 215         u8 val;
 216
 217         val = flash->timeout << AS_INDICATOR_AND_TIMER_TIMEOUT_SHIFT;
 218
 219         val |= (flash->cfg.voltage_reference
 220                 << AS_INDICATOR_AND_TIMER_VREF_SHIFT)
 221             |  ((flash->indicator_current ? flash->indicator_current - 1 : 0)
 222                  << AS_INDICATOR_AND_TIMER_INDICATOR_SHIFT);
 223
 224         return as3645a_write(flash, AS_INDICATOR_AND_TIMER_REG, val);
 225 }
 226
 227 /**
 228  * as3645a_set_control - Set flash control register
 229  * @flash: The flash
 230  * @mode: Desired output mode
 231  * @on: Desired output state
 232  *
 233  * Configure the hardware with output mode and state.
 234  *
 235  * Return 0 on success, or a negative error code if an I2C communication error
 236  * occurred.
 237  */
 238 static int
 239 as3645a_set_control(struct as3645a *flash, enum as_mode mode, bool on)
 240 {
 241         u8 reg;
 242
 243         /* Configure output parameters and operation mode. */
 244         reg = (flash->cfg.peak << AS_CONTROL_COIL_PEAK_SHIFT)
 245             | (on ? AS_CONTROL_OUT_ON : 0)
 246             | mode;
 247
 248         if (mode == AS_MODE_FLASH &&
 249             flash->strobe_source == V4L2_FLASH_STROBE_SOURCE_EXTERNAL)
 250                 reg |= AS_CONTROL_STROBE_TYPE_LEVEL
 251                     |  AS_CONTROL_STROBE_ON;
 252
 253         return as3645a_write(flash, AS_CONTROL_REG, reg);
 254 }
 255
 256 static int as3645a_get_fault(struct led_classdev_flash *fled, u32 *fault)
 257 {
 258         struct as3645a *flash = fled_to_as3645a(fled);
 259         int rval;
 260
 261         /* NOTE: reading register clears fault status */
 262         rval = as3645a_read(flash, AS_FAULT_INFO_REG);
 263         if (rval < 0)
 264                 return rval;
 265
 266         if (rval & AS_FAULT_INFO_INDUCTOR_PEAK_LIMIT)
 267                 *fault |= LED_FAULT_OVER_CURRENT;
 268
 269         if (rval & AS_FAULT_INFO_INDICATOR_LED)
 270                 *fault |= LED_FAULT_INDICATOR;
 271
 272         dev_dbg(&flash->client->dev, "%u connected LEDs\n",
 273                 rval & AS_FAULT_INFO_LED_AMOUNT ? 2 : 1);
 274
 275         if (rval & AS_FAULT_INFO_TIMEOUT)
 276                 *fault |= LED_FAULT_TIMEOUT;
 277
 278         if (rval & AS_FAULT_INFO_OVER_TEMPERATURE)
 279                 *fault |= LED_FAULT_OVER_TEMPERATURE;
 280
 281         if (rval & AS_FAULT_INFO_SHORT_CIRCUIT)
 282                 *fault |= LED_FAULT_OVER_CURRENT;
 283
 284         if (rval & AS_FAULT_INFO_OVER_VOLTAGE)
 285                 *fault |= LED_FAULT_INPUT_VOLTAGE;
 286
 287         return rval;
 288 }
 289
 290 static unsigned int __as3645a_current_to_reg(unsigned int min, unsigned int max,
 291                                              unsigned int step,
 292                                              unsigned int val)
 293 {
 294         if (val < min)
 295                 val = min;
 296
 297         if (val > max)
 298                 val = max;
 299
 300         return (val - min) / step;
 301 }
 302
 303 static unsigned int as3645a_current_to_reg(struct as3645a *flash, bool is_flash,
 304                                            unsigned int ua)
 305 {
 306         if (is_flash)
 307                 return __as3645a_current_to_reg(AS_TORCH_INTENSITY_MIN,
 308                                                 flash->cfg.assist_max_ua,
 309                                                 AS_TORCH_INTENSITY_STEP, ua);
 310         else
 311                 return __as3645a_current_to_reg(AS_FLASH_INTENSITY_MIN,
 312                                                 flash->cfg.flash_max_ua,
 313                                                 AS_FLASH_INTENSITY_STEP, ua);
 314 }
 315
 316 static int as3645a_set_indicator_brightness(struct led_classdev *iled_cdev,
 317                                             enum led_brightness brightness)
 318 {
 319         struct as3645a *flash = iled_cdev_to_as3645a(iled_cdev);
 320         int rval;
 321
 322         flash->indicator_current = brightness;
 323
 324         rval = as3645a_set_timeout(flash);
 325         if (rval)
 326                 return rval;
 327
 328         return as3645a_set_control(flash, AS_MODE_INDICATOR, brightness);
 329 }
 330
 331 static int as3645a_set_assist_brightness(struct led_classdev *fled_cdev,
 332                                          enum led_brightness brightness)
 333 {
 334         struct led_classdev_flash *fled = lcdev_to_flcdev(fled_cdev);
 335         struct as3645a *flash = fled_to_as3645a(fled);
 336         int rval;
 337
 338         if (brightness) {
 339                 /* Register value 0 is 20 mA. */
 340                 flash->assist_current = brightness - 1;
 341
 342                 rval = as3645a_set_current(flash);
 343                 if (rval)
 344                         return rval;
 345         }
 346
 347         return as3645a_set_control(flash, AS_MODE_ASSIST, brightness);
 348 }
 349
 350 static int as3645a_set_flash_brightness(struct led_classdev_flash *fled,
 351                                         u32 brightness_ua)
 352 {
 353         struct as3645a *flash = fled_to_as3645a(fled);
 354
 355         flash->flash_current = as3645a_current_to_reg(flash, true,
 356                                                       brightness_ua);
 357
 358         return as3645a_set_current(flash);
 359 }
 360
 361 static int as3645a_set_flash_timeout(struct led_classdev_flash *fled,
 362                                      u32 timeout_us)
 363 {
 364         struct as3645a *flash = fled_to_as3645a(fled);
 365
 366         flash->timeout = AS_TIMER_US_TO_CODE(timeout_us);
 367
 368         return as3645a_set_timeout(flash);
 369 }
 370
 371 static int as3645a_set_strobe(struct led_classdev_flash *fled, bool state)
 372 {
 373         struct as3645a *flash = fled_to_as3645a(fled);
 374
 375         return as3645a_set_control(flash, AS_MODE_FLASH, state);
 376 }
 377
 378 static const struct led_flash_ops as3645a_led_flash_ops = {
 379         .flash_brightness_set = as3645a_set_flash_brightness,
 380         .timeout_set = as3645a_set_flash_timeout,
 381         .strobe_set = as3645a_set_strobe,
 382         .fault_get = as3645a_get_fault,
 383 };
 384
 385 static int as3645a_setup(struct as3645a *flash)
 386 {
 387         struct device *dev = &flash->client->dev;
 388         u32 fault = 0;
 389         int rval;
 390
 391         /* clear errors */
 392         rval = as3645a_read(flash, AS_FAULT_INFO_REG);
 393         if (rval < 0)
 394                 return rval;
 395
 396         dev_dbg(dev, "Fault info: %02x\n", rval);
 397
 398         rval = as3645a_set_current(flash);
 399         if (rval < 0)
 400                 return rval;
 401
 402         rval = as3645a_set_timeout(flash);
 403         if (rval < 0)
 404                 return rval;
 405
 406         rval = as3645a_set_control(flash, AS_MODE_INDICATOR, false);
 407         if (rval < 0)
 408                 return rval;
 409
 410         /* read status */
 411         rval = as3645a_get_fault(&flash->fled, &fault);
 412         if (rval < 0)
 413                 return rval;
 414
 415         dev_dbg(dev, "AS_INDICATOR_AND_TIMER_REG: %02x\n",
 416                 as3645a_read(flash, AS_INDICATOR_AND_TIMER_REG));
 417         dev_dbg(dev, "AS_CURRENT_SET_REG: %02x\n",
 418                 as3645a_read(flash, AS_CURRENT_SET_REG));
 419         dev_dbg(dev, "AS_CONTROL_REG: %02x\n",
 420                 as3645a_read(flash, AS_CONTROL_REG));
 421
 422         return rval & ~AS_FAULT_INFO_LED_AMOUNT ? -EIO : 0;
 423 }
 424
 425 static int as3645a_detect(struct as3645a *flash)
 426 {
 427         struct device *dev = &flash->client->dev;
 428         int rval, man, model, rfu, version;
 429         const char *vendor;
 430
 431         rval = as3645a_read(flash, AS_DESIGN_INFO_REG);
 432         if (rval < 0) {
 433                 dev_err(dev, "can't read design info reg\n");
 434                 return rval;
 435         }
 436
 437         man = AS_DESIGN_INFO_FACTORY(rval);
 438         model = AS_DESIGN_INFO_MODEL(rval);
 439
 440         rval = as3645a_read(flash, AS_VERSION_CONTROL_REG);
 441         if (rval < 0) {
 442                 dev_err(dev, "can't read version control reg\n");
 443                 return rval;
 444         }
 445
 446         rfu = AS_VERSION_CONTROL_RFU(rval);
 447         version = AS_VERSION_CONTROL_VERSION(rval);
 448
 449         /* Verify the chip model and version. */
 450         if (model != 0x01 || rfu != 0x00) {
 451                 dev_err(dev, "AS3645A not detected (model %d rfu %d)\n",
 452                         model, rfu);
 453                 return -ENODEV;
 454         }
 455
 456         switch (man) {
 457         case 1:
 458                 vendor = "AMS, Austria Micro Systems";
 459                 break;
 460         case 2:
 461                 vendor = "ADI, Analog Devices Inc.";
 462                 break;
 463         case 3:
 464                 vendor = "NSC, National Semiconductor";
 465                 break;
 466         case 4:
 467                 vendor = "NXP";
 468                 break;
 469         case 5:
 470                 vendor = "TI, Texas Instrument";
 471                 break;
 472         default:
 473                 vendor = "Unknown";
 474         }
 475
 476         dev_info(dev, "Chip vendor: %s (%d) Version: %d\n", vendor,
 477                  man, version);
 478
 479         rval = as3645a_write(flash, AS_PASSWORD_REG, AS_PASSWORD_UNLOCK_VALUE);
 480         if (rval < 0)
 481                 return rval;
 482
 483         return as3645a_write(flash, AS_BOOST_REG, AS_BOOST_CURRENT_DISABLE);
 484 }
 485
 486 static int as3645a_parse_node(struct as3645a *flash,
 487                               struct as3645a_names *names,
 488                               struct fwnode_handle *fwnode)
 489 {
 490         struct as3645a_config *cfg = &flash->cfg;
 491         struct fwnode_handle *child;
 492         const char *name;
 493         int rval;
 494
 495         fwnode_for_each_child_node(fwnode, child) {
 496                 u32 id = 0;
 497
 498                 fwnode_property_read_u32(child, "reg", &id);
 499
 500                 switch (id) {
 501                 case AS_LED_FLASH:
 502                         flash->flash_node = child;
 503                         break;
 504                 case AS_LED_INDICATOR:
 505                         flash->indicator_node = child;
 506                         break;
 507                 default:
 508                         dev_warn(&flash->client->dev,
 509                                  "unknown LED %u encountered, ignoring\n", id);
 510                         break;
 511                 }
 512                 fwnode_handle_get(child);
 513         }
 514
 515         if (!flash->flash_node) {
 516                 dev_err(&flash->client->dev, "can't find flash node\n");
 517                 return -ENODEV;
 518         }
 519
 520         rval = fwnode_property_read_string(flash->flash_node, "label", &name);
 521         if (!rval) {
 522                 strlcpy(names->flash, name, sizeof(names->flash));
 523         } else if (is_of_node(fwnode)) {
 524                 snprintf(names->flash, sizeof(names->flash),
 525                          "%pOFn:flash", to_of_node(fwnode));
 526         } else {
 527                 dev_err(&flash->client->dev, "flash node has no label!\n");
 528                 return -EINVAL;
 529         }
 530
 531         rval = fwnode_property_read_u32(flash->flash_node, "flash-timeout-us",
 532                                         &cfg->flash_timeout_us);
 533         if (rval < 0) {
 534                 dev_err(&flash->client->dev,
 535                         "can't read flash-timeout-us property for flash\n");
 536                 goto out_err;
 537         }
 538
 539         rval = fwnode_property_read_u32(flash->flash_node, "flash-max-microamp",
 540                                         &cfg->flash_max_ua);
 541         if (rval < 0) {
 542                 dev_err(&flash->client->dev,
 543                         "can't read flash-max-microamp property for flash\n");
 544                 goto out_err;
 545         }
 546
 547         rval = fwnode_property_read_u32(flash->flash_node, "led-max-microamp",
 548                                         &cfg->assist_max_ua);
 549         if (rval < 0) {
 550                 dev_err(&flash->client->dev,
 551                         "can't read led-max-microamp property for flash\n");
 552                 goto out_err;
 553         }
 554
 555         fwnode_property_read_u32(flash->flash_node, "voltage-reference",
 556                                  &cfg->voltage_reference);
 557
 558         fwnode_property_read_u32(flash->flash_node, "ams,input-max-microamp",
 559                                  &cfg->peak);
 560         cfg->peak = AS_PEAK_mA_TO_REG(cfg->peak);
 561
 562         if (!flash->indicator_node) {
 563                 dev_warn(&flash->client->dev,
 564                          "can't find indicator node\n");
 565                 goto out_err;
 566         }
 567
 568         rval = fwnode_property_read_string(flash->indicator_node, "label",
 569                                            &name);
 570         if (!rval) {
 571                 strlcpy(names->indicator, name, sizeof(names->indicator));
 572         } else if (is_of_node(fwnode)) {
 573                 snprintf(names->indicator, sizeof(names->indicator),
 574                          "%pOFn:indicator", to_of_node(fwnode));
 575         } else {
 576                 dev_err(&flash->client->dev, "indicator node has no label!\n");
 577                 return -EINVAL;
 578         }
 579
 580         rval = fwnode_property_read_u32(flash->indicator_node,
 581                                         "led-max-microamp",
 582                                         &cfg->indicator_max_ua);
 583         if (rval < 0) {
 584                 dev_err(&flash->client->dev,
 585                         "can't read led-max-microamp property for indicator\n");
 586                 goto out_err;
 587         }
 588
 589         return 0;
 590
 591 out_err:
 592         fwnode_handle_put(flash->flash_node);
 593         fwnode_handle_put(flash->indicator_node);
 594
 595         return rval;
 596 }
 597
 598 static int as3645a_led_class_setup(struct as3645a *flash,
 599                                    struct as3645a_names *names)
 600 {
 601         struct led_classdev *fled_cdev = &flash->fled.led_cdev;
 602         struct led_classdev *iled_cdev = &flash->iled_cdev;
 603         struct led_flash_setting *cfg;
 604         int rval;
 605
 606         iled_cdev->name = names->indicator;
 607         iled_cdev->brightness_set_blocking = as3645a_set_indicator_brightness;
 608         iled_cdev->max_brightness =
 609                 flash->cfg.indicator_max_ua / AS_INDICATOR_INTENSITY_STEP;
 610         iled_cdev->flags = LED_CORE_SUSPENDRESUME;
 611
 612         rval = led_classdev_register(&flash->client->dev, iled_cdev);
 613         if (rval < 0)
 614                 return rval;
 615
 616         cfg = &flash->fled.brightness;
 617         cfg->min = AS_FLASH_INTENSITY_MIN;
 618         cfg->max = flash->cfg.flash_max_ua;
 619         cfg->step = AS_FLASH_INTENSITY_STEP;
 620         cfg->val = flash->cfg.flash_max_ua;
 621
 622         cfg = &flash->fled.timeout;
 623         cfg->min = AS_FLASH_TIMEOUT_MIN;
 624         cfg->max = flash->cfg.flash_timeout_us;
 625         cfg->step = AS_FLASH_TIMEOUT_STEP;
 626         cfg->val = flash->cfg.flash_timeout_us;
 627
 628         flash->fled.ops = &as3645a_led_flash_ops;
 629
 630         fled_cdev->name = names->flash;
 631         fled_cdev->brightness_set_blocking = as3645a_set_assist_brightness;
 632         /* Value 0 is off in LED class. */
 633         fled_cdev->max_brightness =
 634                 as3645a_current_to_reg(flash, false,
 635                                        flash->cfg.assist_max_ua) + 1;
 636         fled_cdev->flags = LED_DEV_CAP_FLASH | LED_CORE_SUSPENDRESUME;
 637
 638         rval = led_classdev_flash_register(&flash->client->dev, &flash->fled);
 639         if (rval) {
 640                 led_classdev_unregister(iled_cdev);
 641                 dev_err(&flash->client->dev,
 642                         "led_classdev_flash_register() failed, error %d\n",
 643                         rval);
 644         }
 645
 646         return rval;
 647 }
 648
 649 static int as3645a_v4l2_setup(struct as3645a *flash)
 650 {
 651         struct led_classdev_flash *fled = &flash->fled;
 652         struct led_classdev *led = &fled->led_cdev;
 653         struct v4l2_flash_config cfg = {
 654                 .intensity = {
 655                         .min = AS_TORCH_INTENSITY_MIN,
 656                         .max = flash->cfg.assist_max_ua,
 657                         .step = AS_TORCH_INTENSITY_STEP,
 658                         .val = flash->cfg.assist_max_ua,
 659                 },
 660         };
 661         struct v4l2_flash_config cfgind = {
 662                 .intensity = {
 663                         .min = AS_INDICATOR_INTENSITY_MIN,
 664                         .max = flash->cfg.indicator_max_ua,
 665                         .step = AS_INDICATOR_INTENSITY_STEP,
 666                         .val = flash->cfg.indicator_max_ua,
 667                 },
 668         };
 669
 670         strlcpy(cfg.dev_name, led->name, sizeof(cfg.dev_name));
 671         strlcpy(cfgind.dev_name, flash->iled_cdev.name, sizeof(cfg.dev_name));
 672
 673         flash->vf = v4l2_flash_init(
 674                 &flash->client->dev, flash->flash_node, &flash->fled, NULL,
 675                 &cfg);
 676         if (IS_ERR(flash->vf))
 677                 return PTR_ERR(flash->vf);
 678
 679         flash->vfind = v4l2_flash_indicator_init(
 680                 &flash->client->dev, flash->indicator_node, &flash->iled_cdev,
 681                 &cfgind);
 682         if (IS_ERR(flash->vfind)) {
 683                 v4l2_flash_release(flash->vf);
 684                 return PTR_ERR(flash->vfind);
 685         }
 686
 687         return 0;
 688 }
 689
 690 static int as3645a_probe(struct i2c_client *client)
 691 {
 692         struct as3645a_names names;
 693         struct as3645a *flash;
 694         int rval;
 695
 696         if (!dev_fwnode(&client->dev))
 697                 return -ENODEV;
 698
 699         flash = devm_kzalloc(&client->dev, sizeof(*flash), GFP_KERNEL);
 700         if (flash == NULL)
 701                 return -ENOMEM;
 702
 703         flash->client = client;
 704
 705         rval = as3645a_parse_node(flash, &names, dev_fwnode(&client->dev));
 706         if (rval < 0)
 707                 return rval;
 708
 709         rval = as3645a_detect(flash);
 710         if (rval < 0)
 711                 goto out_put_nodes;
 712
 713         mutex_init(&flash->mutex);
 714         i2c_set_clientdata(client, flash);
 715
 716         rval = as3645a_setup(flash);
 717         if (rval)
 718                 goto out_mutex_destroy;
 719
 720         rval = as3645a_led_class_setup(flash, &names);
 721         if (rval)
 722                 goto out_mutex_destroy;
 723
 724         rval = as3645a_v4l2_setup(flash);
 725         if (rval)
 726                 goto out_led_classdev_flash_unregister;
 727
 728         return 0;
 729
 730 out_led_classdev_flash_unregister:
 731         led_classdev_flash_unregister(&flash->fled);
 732
 733 out_mutex_destroy:
 734         mutex_destroy(&flash->mutex);
 735
 736 out_put_nodes:
 737         fwnode_handle_put(flash->flash_node);
 738         fwnode_handle_put(flash->indicator_node);
 739
 740         return rval;
 741 }
 742
 743 static int as3645a_remove(struct i2c_client *client)
 744 {
 745         struct as3645a *flash = i2c_get_clientdata(client);
 746
 747         as3645a_set_control(flash, AS_MODE_EXT_TORCH, false);
 748
 749         v4l2_flash_release(flash->vf);
 750         v4l2_flash_release(flash->vfind);
 751
 752         led_classdev_flash_unregister(&flash->fled);
 753         led_classdev_unregister(&flash->iled_cdev);
 754
 755         mutex_destroy(&flash->mutex);
 756
 757         fwnode_handle_put(flash->flash_node);
 758         fwnode_handle_put(flash->indicator_node);
 759
 760         return 0;
 761 }
 762
 763 static const struct i2c_device_id as3645a_id_table[] = {
 764         { AS_NAME, 0 },
 765         { },
 766 };
 767 MODULE_DEVICE_TABLE(i2c, as3645a_id_table);
 768
 769 static const struct of_device_id as3645a_of_table[] = {
 770         { .compatible = "ams,as3645a" },
 771         { },
 772 };
 773 MODULE_DEVICE_TABLE(of, as3645a_of_table);
 774
 775 static struct i2c_driver as3645a_i2c_driver = {
 776         .driver = {
 777                 .of_match_table = as3645a_of_table,
 778                 .name = AS_NAME,
 779         },
 780         .probe_new      = as3645a_probe,
 781         .remove = as3645a_remove,
 782         .id_table = as3645a_id_table,
 783 };
 784
 785 module_i2c_driver(as3645a_i2c_driver);
 786
 787 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
 788 MODULE_AUTHOR("Sakari Ailus <sakari.ailus@iki.fi>");
 789 MODULE_DESCRIPTION("LED flash driver for AS3645A, LM3555 and their clones");
 790 MODULE_LICENSE("GPL v2");