drivers/leds/leds-as3645a.c

   1 /*
   2  * drivers/leds/leds-as3645a.c - AS3645A and LM3555 flash controllers driver
   3  *
   4  * Copyright (C) 2008-2011 Nokia Corporation
   5  * Copyright (c) 2011, 2017 Intel Corporation.
   6  *
   7  * Based on drivers/media/i2c/as3645a.c.
   8  *
   9  * Contact: Sakari Ailus <sakari.ailus@iki.fi>
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License
  13  * version 2 as published by the Free Software Foundation.
  14  *
  15  * This program is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
  19  */
  20
  21 #include <linux/delay.h>
  22 #include <linux/gpio/consumer.h>
  23 #include <linux/i2c.h>
  24 #include <linux/led-class-flash.h>
  25 #include <linux/leds.h>
  26 #include <linux/module.h>
  27 #include <linux/mutex.h>
  28 #include <linux/of.h>
  29 #include <linux/slab.h>
  30
  31 #include <media/v4l2-flash-led-class.h>
  32
  33 #define AS_TIMER_US_TO_CODE(t)                  (((t) / 1000 - 100) / 50)
  34 #define AS_TIMER_CODE_TO_US(c)                  ((50 * (c) + 100) * 1000)
  35
  36 /* Register definitions */
  37
  38 /* Read-only Design info register: Reset state: xxxx 0001 */
  39 #define AS_DESIGN_INFO_REG                      0x00
  40 #define AS_DESIGN_INFO_FACTORY(x)               (((x) >> 4))
  41 #define AS_DESIGN_INFO_MODEL(x)                 ((x) & 0x0f)
  42
  43 /* Read-only Version control register: Reset state: 0000 0000
  44  * for first engineering samples
  45  */
  46 #define AS_VERSION_CONTROL_REG                  0x01
  47 #define AS_VERSION_CONTROL_RFU(x)               (((x) >> 4))
  48 #define AS_VERSION_CONTROL_VERSION(x)           ((x) & 0x0f)
  49
  50 /* Read / Write (Indicator and timer register): Reset state: 0000 1111 */
  51 #define AS_INDICATOR_AND_TIMER_REG              0x02
  52 #define AS_INDICATOR_AND_TIMER_TIMEOUT_SHIFT    0
  53 #define AS_INDICATOR_AND_TIMER_VREF_SHIFT       4
  54 #define AS_INDICATOR_AND_TIMER_INDICATOR_SHIFT  6
  55
  56 /* Read / Write (Current set register): Reset state: 0110 1001 */
  57 #define AS_CURRENT_SET_REG                      0x03
  58 #define AS_CURRENT_ASSIST_LIGHT_SHIFT           0
  59 #define AS_CURRENT_LED_DET_ON                   (1 << 3)
  60 #define AS_CURRENT_FLASH_CURRENT_SHIFT          4
  61
  62 /* Read / Write (Control register): Reset state: 1011 0100 */
  63 #define AS_CONTROL_REG                          0x04
  64 #define AS_CONTROL_MODE_SETTING_SHIFT           0
  65 #define AS_CONTROL_STROBE_ON                    (1 << 2)
  66 #define AS_CONTROL_OUT_ON                       (1 << 3)
  67 #define AS_CONTROL_EXT_TORCH_ON                 (1 << 4)
  68 #define AS_CONTROL_STROBE_TYPE_EDGE             (0 << 5)
  69 #define AS_CONTROL_STROBE_TYPE_LEVEL            (1 << 5)
  70 #define AS_CONTROL_COIL_PEAK_SHIFT              6
  71
  72 /* Read only (D3 is read / write) (Fault and info): Reset state: 0000 x000 */
  73 #define AS_FAULT_INFO_REG                       0x05
  74 #define AS_FAULT_INFO_INDUCTOR_PEAK_LIMIT       (1 << 1)
  75 #define AS_FAULT_INFO_INDICATOR_LED             (1 << 2)
  76 #define AS_FAULT_INFO_LED_AMOUNT                (1 << 3)
  77 #define AS_FAULT_INFO_TIMEOUT                   (1 << 4)
  78 #define AS_FAULT_INFO_OVER_TEMPERATURE          (1 << 5)
  79 #define AS_FAULT_INFO_SHORT_CIRCUIT             (1 << 6)
  80 #define AS_FAULT_INFO_OVER_VOLTAGE              (1 << 7)
  81
  82 /* Boost register */
  83 #define AS_BOOST_REG                            0x0d
  84 #define AS_BOOST_CURRENT_DISABLE                (0 << 0)
  85 #define AS_BOOST_CURRENT_ENABLE                 (1 << 0)
  86
  87 /* Password register is used to unlock boost register writing */
  88 #define AS_PASSWORD_REG                         0x0f
  89 #define AS_PASSWORD_UNLOCK_VALUE                0x55
  90
  91 #define AS_NAME                                 "as3645a"
  92 #define AS_I2C_ADDR                             (0x60 >> 1) /* W:0x60, R:0x61 */
  93
  94 #define AS_FLASH_TIMEOUT_MIN                    100000  /* us */
  95 #define AS_FLASH_TIMEOUT_MAX                    850000
  96 #define AS_FLASH_TIMEOUT_STEP                   50000
  97
  98 #define AS_FLASH_INTENSITY_MIN                  200000  /* uA */
  99 #define AS_FLASH_INTENSITY_MAX_1LED             500000
 100 #define AS_FLASH_INTENSITY_MAX_2LEDS            400000
 101 #define AS_FLASH_INTENSITY_STEP                 20000
 102
 103 #define AS_TORCH_INTENSITY_MIN                  20000   /* uA */
 104 #define AS_TORCH_INTENSITY_MAX                  160000
 105 #define AS_TORCH_INTENSITY_STEP                 20000
 106
 107 #define AS_INDICATOR_INTENSITY_MIN              0       /* uA */
 108 #define AS_INDICATOR_INTENSITY_MAX              10000
 109 #define AS_INDICATOR_INTENSITY_STEP             2500
 110
 111 #define AS_PEAK_mA_MAX                          2000
 112 #define AS_PEAK_mA_TO_REG(a) \
 113         ((min_t(u32, AS_PEAK_mA_MAX, a) - 1250) / 250)
 114
 115 /* LED numbers for Devicetree */
 116 #define AS_LED_FLASH                            0
 117 #define AS_LED_INDICATOR                        1
 118
 119 enum as_mode {
 120         AS_MODE_EXT_TORCH = 0 << AS_CONTROL_MODE_SETTING_SHIFT,
 121         AS_MODE_INDICATOR = 1 << AS_CONTROL_MODE_SETTING_SHIFT,
 122         AS_MODE_ASSIST = 2 << AS_CONTROL_MODE_SETTING_SHIFT,
 123         AS_MODE_FLASH = 3 << AS_CONTROL_MODE_SETTING_SHIFT,
 124 };
 125
 126 struct as3645a_config {
 127         u32 flash_timeout_us;
 128         u32 flash_max_ua;
 129         u32 assist_max_ua;
 130         u32 indicator_max_ua;
 131         u32 voltage_reference;
 132         u32 peak;
 133 };
 134
 135 struct as3645a_names {
 136         char flash[32];
 137         char indicator[32];
 138 };
 139
 140 struct as3645a {
 141         struct i2c_client *client;
 142
 143         struct mutex mutex;
 144
 145         struct led_classdev_flash fled;
 146         struct led_classdev iled_cdev;
 147
 148         struct v4l2_flash *vf;
 149         struct v4l2_flash *vfind;
 150
 151         struct device_node *flash_node;
 152         struct device_node *indicator_node;
 153
 154         struct as3645a_config cfg;
 155
 156         enum as_mode mode;
 157         unsigned int timeout;
 158         unsigned int flash_current;
 159         unsigned int assist_current;
 160         unsigned int indicator_current;
 161         enum v4l2_flash_strobe_source strobe_source;
 162 };
 163
 164 #define fled_to_as3645a(__fled) container_of(__fled, struct as3645a, fled)
 165 #define iled_cdev_to_as3645a(__iled_cdev) \
 166         container_of(__iled_cdev, struct as3645a, iled_cdev)
 167
 168 /* Return negative errno else zero on success */
 169 static int as3645a_write(struct as3645a *flash, u8 addr, u8 val)
 170 {
 171         struct i2c_client *client = flash->client;
 172         int rval;
 173
 174         rval = i2c_smbus_write_byte_data(client, addr, val);
 175
 176         dev_dbg(&client->dev, "Write Addr:%02X Val:%02X %s\n", addr, val,
 177                 rval < 0 ? "fail" : "ok");
 178
 179         return rval;
 180 }
 181
 182 /* Return negative errno else a data byte received from the device. */
 183 static int as3645a_read(struct as3645a *flash, u8 addr)
 184 {
 185         struct i2c_client *client = flash->client;
 186         int rval;
 187
 188         rval = i2c_smbus_read_byte_data(client, addr);
 189
 190         dev_dbg(&client->dev, "Read Addr:%02X Val:%02X %s\n", addr, rval,
 191                 rval < 0 ? "fail" : "ok");
 192
 193         return rval;
 194 }
 195
 196 /* -----------------------------------------------------------------------------
 197  * Hardware configuration and trigger
 198  */
 199
 200 /**
 201  * as3645a_set_config - Set flash configuration registers
 202  * @flash: The flash
 203  *
 204  * Configure the hardware with flash, assist and indicator currents, as well as
 205  * flash timeout.
 206  *
 207  * Return 0 on success, or a negative error code if an I2C communication error
 208  * occurred.
 209  */
 210 static int as3645a_set_current(struct as3645a *flash)
 211 {
 212         u8 val;
 213
 214         val = (flash->flash_current << AS_CURRENT_FLASH_CURRENT_SHIFT)
 215             | (flash->assist_current << AS_CURRENT_ASSIST_LIGHT_SHIFT)
 216             | AS_CURRENT_LED_DET_ON;
 217
 218         return as3645a_write(flash, AS_CURRENT_SET_REG, val);
 219 }
 220
 221 static int as3645a_set_timeout(struct as3645a *flash)
 222 {
 223         u8 val;
 224
 225         val = flash->timeout << AS_INDICATOR_AND_TIMER_TIMEOUT_SHIFT;
 226
 227         val |= (flash->cfg.voltage_reference
 228                 << AS_INDICATOR_AND_TIMER_VREF_SHIFT)
 229             |  ((flash->indicator_current ? flash->indicator_current - 1 : 0)
 230                  << AS_INDICATOR_AND_TIMER_INDICATOR_SHIFT);
 231
 232         return as3645a_write(flash, AS_INDICATOR_AND_TIMER_REG, val);
 233 }
 234
 235 /**
 236  * as3645a_set_control - Set flash control register
 237  * @flash: The flash
 238  * @mode: Desired output mode
 239  * @on: Desired output state
 240  *
 241  * Configure the hardware with output mode and state.
 242  *
 243  * Return 0 on success, or a negative error code if an I2C communication error
 244  * occurred.
 245  */
 246 static int
 247 as3645a_set_control(struct as3645a *flash, enum as_mode mode, bool on)
 248 {
 249         u8 reg;
 250
 251         /* Configure output parameters and operation mode. */
 252         reg = (flash->cfg.peak << AS_CONTROL_COIL_PEAK_SHIFT)
 253             | (on ? AS_CONTROL_OUT_ON : 0)
 254             | mode;
 255
 256         if (mode == AS_MODE_FLASH &&
 257             flash->strobe_source == V4L2_FLASH_STROBE_SOURCE_EXTERNAL)
 258                 reg |= AS_CONTROL_STROBE_TYPE_LEVEL
 259                     |  AS_CONTROL_STROBE_ON;
 260
 261         return as3645a_write(flash, AS_CONTROL_REG, reg);
 262 }
 263
 264 static int as3645a_get_fault(struct led_classdev_flash *fled, u32 *fault)
 265 {
 266         struct as3645a *flash = fled_to_as3645a(fled);
 267         int rval;
 268
 269         /* NOTE: reading register clears fault status */
 270         rval = as3645a_read(flash, AS_FAULT_INFO_REG);
 271         if (rval < 0)
 272                 return rval;
 273
 274         if (rval & AS_FAULT_INFO_INDUCTOR_PEAK_LIMIT)
 275                 *fault |= LED_FAULT_OVER_CURRENT;
 276
 277         if (rval & AS_FAULT_INFO_INDICATOR_LED)
 278                 *fault |= LED_FAULT_INDICATOR;
 279
 280         dev_dbg(&flash->client->dev, "%u connected LEDs\n",
 281                 rval & AS_FAULT_INFO_LED_AMOUNT ? 2 : 1);
 282
 283         if (rval & AS_FAULT_INFO_TIMEOUT)
 284                 *fault |= LED_FAULT_TIMEOUT;
 285
 286         if (rval & AS_FAULT_INFO_OVER_TEMPERATURE)
 287                 *fault |= LED_FAULT_OVER_TEMPERATURE;
 288
 289         if (rval & AS_FAULT_INFO_SHORT_CIRCUIT)
 290                 *fault |= LED_FAULT_OVER_CURRENT;
 291
 292         if (rval & AS_FAULT_INFO_OVER_VOLTAGE)
 293                 *fault |= LED_FAULT_INPUT_VOLTAGE;
 294
 295         return rval;
 296 }
 297
 298 static unsigned int __as3645a_current_to_reg(unsigned int min, unsigned int max,
 299                                              unsigned int step,
 300                                              unsigned int val)
 301 {
 302         if (val < min)
 303                 val = min;
 304
 305         if (val > max)
 306                 val = max;
 307
 308         return (val - min) / step;
 309 }
 310
 311 static unsigned int as3645a_current_to_reg(struct as3645a *flash, bool is_flash,
 312                                            unsigned int ua)
 313 {
 314         if (is_flash)
 315                 return __as3645a_current_to_reg(AS_TORCH_INTENSITY_MIN,
 316                                                 flash->cfg.assist_max_ua,
 317                                                 AS_TORCH_INTENSITY_STEP, ua);
 318         else
 319                 return __as3645a_current_to_reg(AS_FLASH_INTENSITY_MIN,
 320                                                 flash->cfg.flash_max_ua,
 321                                                 AS_FLASH_INTENSITY_STEP, ua);
 322 }
 323
 324 static int as3645a_set_indicator_brightness(struct led_classdev *iled_cdev,
 325                                             enum led_brightness brightness)
 326 {
 327         struct as3645a *flash = iled_cdev_to_as3645a(iled_cdev);
 328         int rval;
 329
 330         flash->indicator_current = brightness;
 331
 332         rval = as3645a_set_timeout(flash);
 333         if (rval)
 334                 return rval;
 335
 336         return as3645a_set_control(flash, AS_MODE_INDICATOR, brightness);
 337 }
 338
 339 static int as3645a_set_assist_brightness(struct led_classdev *fled_cdev,
 340                                          enum led_brightness brightness)
 341 {
 342         struct led_classdev_flash *fled = lcdev_to_flcdev(fled_cdev);
 343         struct as3645a *flash = fled_to_as3645a(fled);
 344         int rval;
 345
 346         if (brightness) {
 347                 /* Register value 0 is 20 mA. */
 348                 flash->assist_current = brightness - 1;
 349
 350                 rval = as3645a_set_current(flash);
 351                 if (rval)
 352                         return rval;
 353         }
 354
 355         return as3645a_set_control(flash, AS_MODE_ASSIST, brightness);
 356 }
 357
 358 static int as3645a_set_flash_brightness(struct led_classdev_flash *fled,
 359                                         u32 brightness_ua)
 360 {
 361         struct as3645a *flash = fled_to_as3645a(fled);
 362
 363         flash->flash_current = as3645a_current_to_reg(flash, true, brightness_ua);
 364
 365         return as3645a_set_current(flash);
 366 }
 367
 368 static int as3645a_set_flash_timeout(struct led_classdev_flash *fled,
 369                                      u32 timeout_us)
 370 {
 371         struct as3645a *flash = fled_to_as3645a(fled);
 372
 373         flash->timeout = AS_TIMER_US_TO_CODE(timeout_us);
 374
 375         return as3645a_set_timeout(flash);
 376 }
 377
 378 static int as3645a_set_strobe(struct led_classdev_flash *fled, bool state)
 379 {
 380         struct as3645a *flash = fled_to_as3645a(fled);
 381
 382         return as3645a_set_control(flash, AS_MODE_FLASH, state);
 383 }
 384
 385 static const struct led_flash_ops as3645a_led_flash_ops = {
 386         .flash_brightness_set = as3645a_set_flash_brightness,
 387         .timeout_set = as3645a_set_flash_timeout,
 388         .strobe_set = as3645a_set_strobe,
 389         .fault_get = as3645a_get_fault,
 390 };
 391
 392 static int as3645a_setup(struct as3645a *flash)
 393 {
 394         struct device *dev = &flash->client->dev;
 395         u32 fault = 0;
 396         int rval;
 397
 398         /* clear errors */
 399         rval = as3645a_read(flash, AS_FAULT_INFO_REG);
 400         if (rval < 0)
 401                 return rval;
 402
 403         dev_dbg(dev, "Fault info: %02x\n", rval);
 404
 405         rval = as3645a_set_current(flash);
 406         if (rval < 0)
 407                 return rval;
 408
 409         rval = as3645a_set_timeout(flash);
 410         if (rval < 0)
 411                 return rval;
 412
 413         rval = as3645a_set_control(flash, AS_MODE_INDICATOR, false);
 414         if (rval < 0)
 415                 return rval;
 416
 417         /* read status */
 418         rval = as3645a_get_fault(&flash->fled, &fault);
 419         if (rval < 0)
 420                 return rval;
 421
 422         dev_dbg(dev, "AS_INDICATOR_AND_TIMER_REG: %02x\n",
 423                 as3645a_read(flash, AS_INDICATOR_AND_TIMER_REG));
 424         dev_dbg(dev, "AS_CURRENT_SET_REG: %02x\n",
 425                 as3645a_read(flash, AS_CURRENT_SET_REG));
 426         dev_dbg(dev, "AS_CONTROL_REG: %02x\n",
 427                 as3645a_read(flash, AS_CONTROL_REG));
 428
 429         return rval & ~AS_FAULT_INFO_LED_AMOUNT ? -EIO : 0;
 430 }
 431
 432 static int as3645a_detect(struct as3645a *flash)
 433 {
 434         struct device *dev = &flash->client->dev;
 435         int rval, man, model, rfu, version;
 436         const char *vendor;
 437
 438         rval = as3645a_read(flash, AS_DESIGN_INFO_REG);
 439         if (rval < 0) {
 440                 dev_err(dev, "can't read design info reg\n");
 441                 return rval;
 442         }
 443
 444         man = AS_DESIGN_INFO_FACTORY(rval);
 445         model = AS_DESIGN_INFO_MODEL(rval);
 446
 447         rval = as3645a_read(flash, AS_VERSION_CONTROL_REG);
 448         if (rval < 0) {
 449                 dev_err(dev, "can't read version control reg\n");
 450                 return rval;
 451         }
 452
 453         rfu = AS_VERSION_CONTROL_RFU(rval);
 454         version = AS_VERSION_CONTROL_VERSION(rval);
 455
 456         /* Verify the chip model and version. */
 457         if (model != 0x01 || rfu != 0x00) {
 458                 dev_err(dev, "AS3645A not detected "
 459                         "(model %d rfu %d)\n", model, rfu);
 460                 return -ENODEV;
 461         }
 462
 463         switch (man) {
 464         case 1:
 465                 vendor = "AMS, Austria Micro Systems";
 466                 break;
 467         case 2:
 468                 vendor = "ADI, Analog Devices Inc.";
 469                 break;
 470         case 3:
 471                 vendor = "NSC, National Semiconductor";
 472                 break;
 473         case 4:
 474                 vendor = "NXP";
 475                 break;
 476         case 5:
 477                 vendor = "TI, Texas Instrument";
 478                 break;
 479         default:
 480                 vendor = "Unknown";
 481         }
 482
 483         dev_info(dev, "Chip vendor: %s (%d) Version: %d\n", vendor,
 484                  man, version);
 485
 486         rval = as3645a_write(flash, AS_PASSWORD_REG, AS_PASSWORD_UNLOCK_VALUE);
 487         if (rval < 0)
 488                 return rval;
 489
 490         return as3645a_write(flash, AS_BOOST_REG, AS_BOOST_CURRENT_DISABLE);
 491 }
 492
 493 static int as3645a_parse_node(struct as3645a *flash,
 494                               struct as3645a_names *names,
 495                               struct device_node *node)
 496 {
 497         struct as3645a_config *cfg = &flash->cfg;
 498         struct device_node *child;
 499         const char *name;
 500         int rval;
 501
 502         for_each_child_of_node(node, child) {
 503                 u32 id = 0;
 504
 505                 of_property_read_u32(child, "reg", &id);
 506
 507                 switch (id) {
 508                 case AS_LED_FLASH:
 509                         flash->flash_node = of_node_get(child);
 510                         break;
 511                 case AS_LED_INDICATOR:
 512                         flash->indicator_node = of_node_get(child);
 513                         break;
 514                 default:
 515                         dev_warn(&flash->client->dev,
 516                                  "unknown LED %u encountered, ignoring\n", id);
 517                         break;
 518                 }
 519         }
 520
 521         if (!flash->flash_node) {
 522                 dev_err(&flash->client->dev, "can't find flash node\n");
 523                 return -ENODEV;
 524         }
 525
 526         rval = of_property_read_string(flash->flash_node, "label", &name);
 527         if (!rval)
 528                 strlcpy(names->flash, name, sizeof(names->flash));
 529         else
 530                 snprintf(names->flash, sizeof(names->flash),
 531                          "%s:flash", node->name);
 532
 533         rval = of_property_read_u32(flash->flash_node, "flash-timeout-us",
 534                                     &cfg->flash_timeout_us);
 535         if (rval < 0) {
 536                 dev_err(&flash->client->dev,
 537                         "can't read flash-timeout-us property for flash\n");
 538                 goto out_err;
 539         }
 540
 541         rval = of_property_read_u32(flash->flash_node, "flash-max-microamp",
 542                                     &cfg->flash_max_ua);
 543         if (rval < 0) {
 544                 dev_err(&flash->client->dev,
 545                         "can't read flash-max-microamp property for flash\n");
 546                 goto out_err;
 547         }
 548
 549         rval = of_property_read_u32(flash->flash_node, "led-max-microamp",
 550                                     &cfg->assist_max_ua);
 551         if (rval < 0) {
 552                 dev_err(&flash->client->dev,
 553                         "can't read led-max-microamp property for flash\n");
 554                 goto out_err;
 555         }
 556
 557         of_property_read_u32(flash->flash_node, "voltage-reference",
 558                              &cfg->voltage_reference);
 559
 560         of_property_read_u32(flash->flash_node, "ams,input-max-microamp",
 561                              &cfg->peak);
 562         cfg->peak = AS_PEAK_mA_TO_REG(cfg->peak);
 563
 564         if (!flash->indicator_node) {
 565                 dev_warn(&flash->client->dev,
 566                          "can't find indicator node\n");
 567                 goto out_err;
 568         }
 569
 570         rval = of_property_read_string(flash->indicator_node, "label", &name);
 571         if (!rval)
 572                 strlcpy(names->indicator, name, sizeof(names->indicator));
 573         else
 574                 snprintf(names->indicator, sizeof(names->indicator),
 575                          "%s:indicator", node->name);
 576
 577         rval = of_property_read_u32(flash->indicator_node, "led-max-microamp",
 578                                     &cfg->indicator_max_ua);
 579         if (rval < 0) {
 580                 dev_err(&flash->client->dev,
 581                         "can't read led-max-microamp property for indicator\n");
 582                 goto out_err;
 583         }
 584
 585         return 0;
 586
 587 out_err:
 588         of_node_put(flash->flash_node);
 589         of_node_put(flash->indicator_node);
 590
 591         return rval;
 592 }
 593
 594 static int as3645a_led_class_setup(struct as3645a *flash,
 595                                    struct as3645a_names *names)
 596 {
 597         struct led_classdev *fled_cdev = &flash->fled.led_cdev;
 598         struct led_classdev *iled_cdev = &flash->iled_cdev;
 599         struct led_flash_setting *cfg;
 600         int rval;
 601
 602         iled_cdev->name = names->indicator;
 603         iled_cdev->brightness_set_blocking = as3645a_set_indicator_brightness;
 604         iled_cdev->max_brightness =
 605                 flash->cfg.indicator_max_ua / AS_INDICATOR_INTENSITY_STEP;
 606         iled_cdev->flags = LED_CORE_SUSPENDRESUME;
 607
 608         rval = led_classdev_register(&flash->client->dev, iled_cdev);
 609         if (rval < 0)
 610                 return rval;
 611
 612         cfg = &flash->fled.brightness;
 613         cfg->min = AS_FLASH_INTENSITY_MIN;
 614         cfg->max = flash->cfg.flash_max_ua;
 615         cfg->step = AS_FLASH_INTENSITY_STEP;
 616         cfg->val = flash->cfg.flash_max_ua;
 617
 618         cfg = &flash->fled.timeout;
 619         cfg->min = AS_FLASH_TIMEOUT_MIN;
 620         cfg->max = flash->cfg.flash_timeout_us;
 621         cfg->step = AS_FLASH_TIMEOUT_STEP;
 622         cfg->val = flash->cfg.flash_timeout_us;
 623
 624         flash->fled.ops = &as3645a_led_flash_ops;
 625
 626         fled_cdev->name = names->flash;
 627         fled_cdev->brightness_set_blocking = as3645a_set_assist_brightness;
 628         /* Value 0 is off in LED class. */
 629         fled_cdev->max_brightness =
 630                 as3645a_current_to_reg(flash, false,
 631                                        flash->cfg.assist_max_ua) + 1;
 632         fled_cdev->flags = LED_DEV_CAP_FLASH | LED_CORE_SUSPENDRESUME;
 633
 634         rval = led_classdev_flash_register(&flash->client->dev, &flash->fled);
 635         if (rval) {
 636                 led_classdev_unregister(iled_cdev);
 637                 dev_err(&flash->client->dev,
 638                         "led_classdev_flash_register() failed, error %d\n",
 639                         rval);
 640         }
 641
 642         return rval;
 643 }
 644
 645 static int as3645a_v4l2_setup(struct as3645a *flash)
 646 {
 647         struct led_classdev_flash *fled = &flash->fled;
 648         struct led_classdev *led = &fled->led_cdev;
 649         struct v4l2_flash_config cfg = {
 650                 .intensity = {
 651                         .min = AS_TORCH_INTENSITY_MIN,
 652                         .max = flash->cfg.assist_max_ua,
 653                         .step = AS_TORCH_INTENSITY_STEP,
 654                         .val = flash->cfg.assist_max_ua,
 655                 },
 656         };
 657         struct v4l2_flash_config cfgind = {
 658                 .intensity = {
 659                         .min = AS_INDICATOR_INTENSITY_MIN,
 660                         .max = flash->cfg.indicator_max_ua,
 661                         .step = AS_INDICATOR_INTENSITY_STEP,
 662                         .val = flash->cfg.indicator_max_ua,
 663                 },
 664         };
 665
 666         strlcpy(cfg.dev_name, led->name, sizeof(cfg.dev_name));
 667         strlcpy(cfgind.dev_name, flash->iled_cdev.name, sizeof(cfg.dev_name));
 668
 669         flash->vf = v4l2_flash_init(
 670                 &flash->client->dev, of_fwnode_handle(flash->flash_node),
 671                 &flash->fled, NULL, &cfg);
 672         if (IS_ERR(flash->vf))
 673                 return PTR_ERR(flash->vf);
 674
 675         flash->vfind = v4l2_flash_indicator_init(
 676                 &flash->client->dev, of_fwnode_handle(flash->indicator_node),
 677                 &flash->iled_cdev, &cfgind);
 678         if (IS_ERR(flash->vfind)) {
 679                 v4l2_flash_release(flash->vf);
 680                 return PTR_ERR(flash->vfind);
 681         }
 682
 683         return 0;
 684 }
 685
 686 static int as3645a_probe(struct i2c_client *client)
 687 {
 688         struct as3645a_names names;
 689         struct as3645a *flash;
 690         int rval;
 691
 692         if (client->dev.of_node == NULL)
 693                 return -ENODEV;
 694
 695         flash = devm_kzalloc(&client->dev, sizeof(*flash), GFP_KERNEL);
 696         if (flash == NULL)
 697                 return -ENOMEM;
 698
 699         flash->client = client;
 700
 701         rval = as3645a_parse_node(flash, &names, client->dev.of_node);
 702         if (rval < 0)
 703                 return rval;
 704
 705         rval = as3645a_detect(flash);
 706         if (rval < 0)
 707                 goto out_put_nodes;
 708
 709         mutex_init(&flash->mutex);
 710         i2c_set_clientdata(client, flash);
 711
 712         rval = as3645a_setup(flash);
 713         if (rval)
 714                 goto out_mutex_destroy;
 715
 716         rval = as3645a_led_class_setup(flash, &names);
 717         if (rval)
 718                 goto out_mutex_destroy;
 719
 720         rval = as3645a_v4l2_setup(flash);
 721         if (rval)
 722                 goto out_led_classdev_flash_unregister;
 723
 724         return 0;
 725
 726 out_led_classdev_flash_unregister:
 727         led_classdev_flash_unregister(&flash->fled);
 728
 729 out_mutex_destroy:
 730         mutex_destroy(&flash->mutex);
 731
 732 out_put_nodes:
 733         of_node_put(flash->flash_node);
 734         of_node_put(flash->indicator_node);
 735
 736         return rval;
 737 }
 738
 739 static int as3645a_remove(struct i2c_client *client)
 740 {
 741         struct as3645a *flash = i2c_get_clientdata(client);
 742
 743         as3645a_set_control(flash, AS_MODE_EXT_TORCH, false);
 744
 745         v4l2_flash_release(flash->vf);
 746         v4l2_flash_release(flash->vfind);
 747
 748         led_classdev_flash_unregister(&flash->fled);
 749         led_classdev_unregister(&flash->iled_cdev);
 750
 751         mutex_destroy(&flash->mutex);
 752
 753         of_node_put(flash->flash_node);
 754         of_node_put(flash->indicator_node);
 755
 756         return 0;
 757 }
 758
 759 static const struct i2c_device_id as3645a_id_table[] = {
 760         { AS_NAME, 0 },
 761         { },
 762 };
 763 MODULE_DEVICE_TABLE(i2c, as3645a_id_table);
 764
 765 static const struct of_device_id as3645a_of_table[] = {
 766         { .compatible = "ams,as3645a" },
 767         { },
 768 };
 769 MODULE_DEVICE_TABLE(of, as3645a_of_table);
 770
 771 static struct i2c_driver as3645a_i2c_driver = {
 772         .driver = {
 773                 .of_match_table = as3645a_of_table,
 774                 .name = AS_NAME,
 775         },
 776         .probe_new      = as3645a_probe,
 777         .remove = as3645a_remove,
 778         .id_table = as3645a_id_table,
 779 };
 780
 781 module_i2c_driver(as3645a_i2c_driver);
 782
 783 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
 784 MODULE_AUTHOR("Sakari Ailus <sakari.ailus@iki.fi>");
 785 MODULE_DESCRIPTION("LED flash driver for AS3645A, LM3555 and their clones");
 786 MODULE_LICENSE("GPL v2");