drivers/media/i2c/as3645a.c

   1 /*
   2  * drivers/media/i2c/as3645a.c - AS3645A and LM3555 flash controllers driver
   3  *
   4  * Copyright (C) 2008-2011 Nokia Corporation
   5  * Copyright (c) 2011, Intel Corporation.
   6  *
   7  * Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * version 2 as published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  21  * 02110-1301 USA
  22  *
  23  * TODO:
  24  * - Check hardware FSTROBE control when sensor driver add support for this
  25  *
  26  */
  27
  28 #include <linux/delay.h>
  29 #include <linux/i2c.h>
  30 #include <linux/module.h>
  31 #include <linux/mutex.h>
  32 #include <linux/slab.h>
  33
  34 #include <media/i2c/as3645a.h>
  35 #include <media/v4l2-ctrls.h>
  36 #include <media/v4l2-device.h>
  37
  38 #define AS_TIMER_MS_TO_CODE(t)                  (((t) - 100) / 50)
  39 #define AS_TIMER_CODE_TO_MS(c)                  (50 * (c) + 100)
  40
  41 /* Register definitions */
  42
  43 /* Read-only Design info register: Reset state: xxxx 0001 */
  44 #define AS_DESIGN_INFO_REG                      0x00
  45 #define AS_DESIGN_INFO_FACTORY(x)               (((x) >> 4))
  46 #define AS_DESIGN_INFO_MODEL(x)                 ((x) & 0x0f)
  47
  48 /* Read-only Version control register: Reset state: 0000 0000
  49  * for first engineering samples
  50  */
  51 #define AS_VERSION_CONTROL_REG                  0x01
  52 #define AS_VERSION_CONTROL_RFU(x)               (((x) >> 4))
  53 #define AS_VERSION_CONTROL_VERSION(x)           ((x) & 0x0f)
  54
  55 /* Read / Write (Indicator and timer register): Reset state: 0000 1111 */
  56 #define AS_INDICATOR_AND_TIMER_REG              0x02
  57 #define AS_INDICATOR_AND_TIMER_TIMEOUT_SHIFT    0
  58 #define AS_INDICATOR_AND_TIMER_VREF_SHIFT       4
  59 #define AS_INDICATOR_AND_TIMER_INDICATOR_SHIFT  6
  60
  61 /* Read / Write (Current set register): Reset state: 0110 1001 */
  62 #define AS_CURRENT_SET_REG                      0x03
  63 #define AS_CURRENT_ASSIST_LIGHT_SHIFT           0
  64 #define AS_CURRENT_LED_DET_ON                   (1 << 3)
  65 #define AS_CURRENT_FLASH_CURRENT_SHIFT          4
  66
  67 /* Read / Write (Control register): Reset state: 1011 0100 */
  68 #define AS_CONTROL_REG                          0x04
  69 #define AS_CONTROL_MODE_SETTING_SHIFT           0
  70 #define AS_CONTROL_STROBE_ON                    (1 << 2)
  71 #define AS_CONTROL_OUT_ON                       (1 << 3)
  72 #define AS_CONTROL_EXT_TORCH_ON                 (1 << 4)
  73 #define AS_CONTROL_STROBE_TYPE_EDGE             (0 << 5)
  74 #define AS_CONTROL_STROBE_TYPE_LEVEL            (1 << 5)
  75 #define AS_CONTROL_COIL_PEAK_SHIFT              6
  76
  77 /* Read only (D3 is read / write) (Fault and info): Reset state: 0000 x000 */
  78 #define AS_FAULT_INFO_REG                       0x05
  79 #define AS_FAULT_INFO_INDUCTOR_PEAK_LIMIT       (1 << 1)
  80 #define AS_FAULT_INFO_INDICATOR_LED             (1 << 2)
  81 #define AS_FAULT_INFO_LED_AMOUNT                (1 << 3)
  82 #define AS_FAULT_INFO_TIMEOUT                   (1 << 4)
  83 #define AS_FAULT_INFO_OVER_TEMPERATURE          (1 << 5)
  84 #define AS_FAULT_INFO_SHORT_CIRCUIT             (1 << 6)
  85 #define AS_FAULT_INFO_OVER_VOLTAGE              (1 << 7)
  86
  87 /* Boost register */
  88 #define AS_BOOST_REG                            0x0d
  89 #define AS_BOOST_CURRENT_DISABLE                (0 << 0)
  90 #define AS_BOOST_CURRENT_ENABLE                 (1 << 0)
  91
  92 /* Password register is used to unlock boost register writing */
  93 #define AS_PASSWORD_REG                         0x0f
  94 #define AS_PASSWORD_UNLOCK_VALUE                0x55
  95
  96 enum as_mode {
  97         AS_MODE_EXT_TORCH = 0 << AS_CONTROL_MODE_SETTING_SHIFT,
  98         AS_MODE_INDICATOR = 1 << AS_CONTROL_MODE_SETTING_SHIFT,
  99         AS_MODE_ASSIST = 2 << AS_CONTROL_MODE_SETTING_SHIFT,
 100         AS_MODE_FLASH = 3 << AS_CONTROL_MODE_SETTING_SHIFT,
 101 };
 102
 103 /*
 104  * struct as3645a
 105  *
 106  * @subdev:             V4L2 subdev
 107  * @pdata:              Flash platform data
 108  * @power_lock:         Protects power_count
 109  * @power_count:        Power reference count
 110  * @led_mode:           V4L2 flash LED mode
 111  * @timeout:            Flash timeout in microseconds
 112  * @flash_current:      Flash current (0=200mA ... 15=500mA). Maximum
 113  *                      values are 400mA for two LEDs and 500mA for one LED.
 114  * @assist_current:     Torch/Assist light current (0=20mA, 1=40mA ... 7=160mA)
 115  * @indicator_current:  Indicator LED current (0=0mA, 1=2.5mA ... 4=10mA)
 116  * @strobe_source:      Flash strobe source (software or external)
 117  */
 118 struct as3645a {
 119         struct v4l2_subdev subdev;
 120         const struct as3645a_platform_data *pdata;
 121
 122         struct mutex power_lock;
 123         int power_count;
 124
 125         /* Controls */
 126         struct v4l2_ctrl_handler ctrls;
 127
 128         enum v4l2_flash_led_mode led_mode;
 129         unsigned int timeout;
 130         u8 flash_current;
 131         u8 assist_current;
 132         u8 indicator_current;
 133         enum v4l2_flash_strobe_source strobe_source;
 134 };
 135
 136 #define to_as3645a(sd) container_of(sd, struct as3645a, subdev)
 137
 138 /* Return negative errno else zero on success */
 139 static int as3645a_write(struct as3645a *flash, u8 addr, u8 val)
 140 {
 141         struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev);
 142         int rval;
 143
 144         rval = i2c_smbus_write_byte_data(client, addr, val);
 145
 146         dev_dbg(&client->dev, "Write Addr:%02X Val:%02X %s\n", addr, val,
 147                 rval < 0 ? "fail" : "ok");
 148
 149         return rval;
 150 }
 151
 152 /* Return negative errno else a data byte received from the device. */
 153 static int as3645a_read(struct as3645a *flash, u8 addr)
 154 {
 155         struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev);
 156         int rval;
 157
 158         rval = i2c_smbus_read_byte_data(client, addr);
 159
 160         dev_dbg(&client->dev, "Read Addr:%02X Val:%02X %s\n", addr, rval,
 161                 rval < 0 ? "fail" : "ok");
 162
 163         return rval;
 164 }
 165
 166 /* -----------------------------------------------------------------------------
 167  * Hardware configuration and trigger
 168  */
 169
 170 /*
 171  * as3645a_set_config - Set flash configuration registers
 172  * @flash: The flash
 173  *
 174  * Configure the hardware with flash, assist and indicator currents, as well as
 175  * flash timeout.
 176  *
 177  * Return 0 on success, or a negative error code if an I2C communication error
 178  * occurred.
 179  */
 180 static int as3645a_set_config(struct as3645a *flash)
 181 {
 182         int ret;
 183         u8 val;
 184
 185         val = (flash->flash_current << AS_CURRENT_FLASH_CURRENT_SHIFT)
 186             | (flash->assist_current << AS_CURRENT_ASSIST_LIGHT_SHIFT)
 187             | AS_CURRENT_LED_DET_ON;
 188
 189         ret = as3645a_write(flash, AS_CURRENT_SET_REG, val);
 190         if (ret < 0)
 191                 return ret;
 192
 193         val = AS_TIMER_MS_TO_CODE(flash->timeout / 1000)
 194                     << AS_INDICATOR_AND_TIMER_TIMEOUT_SHIFT;
 195
 196         val |= (flash->pdata->vref << AS_INDICATOR_AND_TIMER_VREF_SHIFT)
 197             |  ((flash->indicator_current ? flash->indicator_current - 1 : 0)
 198                  << AS_INDICATOR_AND_TIMER_INDICATOR_SHIFT);
 199
 200         return as3645a_write(flash, AS_INDICATOR_AND_TIMER_REG, val);
 201 }
 202
 203 /*
 204  * as3645a_set_control - Set flash control register
 205  * @flash: The flash
 206  * @mode: Desired output mode
 207  * @on: Desired output state
 208  *
 209  * Configure the hardware with output mode and state.
 210  *
 211  * Return 0 on success, or a negative error code if an I2C communication error
 212  * occurred.
 213  */
 214 static int
 215 as3645a_set_control(struct as3645a *flash, enum as_mode mode, bool on)
 216 {
 217         u8 reg;
 218
 219         /* Configure output parameters and operation mode. */
 220         reg = (flash->pdata->peak << AS_CONTROL_COIL_PEAK_SHIFT)
 221             | (on ? AS_CONTROL_OUT_ON : 0)
 222             | mode;
 223
 224         if (flash->led_mode == V4L2_FLASH_LED_MODE_FLASH &&
 225             flash->strobe_source == V4L2_FLASH_STROBE_SOURCE_EXTERNAL) {
 226                 reg |= AS_CONTROL_STROBE_TYPE_LEVEL
 227                     |  AS_CONTROL_STROBE_ON;
 228         }
 229
 230         return as3645a_write(flash, AS_CONTROL_REG, reg);
 231 }
 232
 233 /*
 234  * as3645a_set_output - Configure output and operation mode
 235  * @flash: Flash controller
 236  * @strobe: Strobe the flash (only valid in flash mode)
 237  *
 238  * Turn the LEDs output on/off and set the operation mode based on the current
 239  * parameters.
 240  *
 241  * The AS3645A can't control the indicator LED independently of the flash/torch
 242  * LED. If the flash controller is in V4L2_FLASH_LED_MODE_NONE mode, set the
 243  * chip to indicator mode. Otherwise set it to assist light (torch) or flash
 244  * mode.
 245  *
 246  * In indicator and assist modes, turn the output on/off based on the indicator
 247  * and torch currents. In software strobe flash mode, turn the output on/off
 248  * based on the strobe parameter.
 249  */
 250 static int as3645a_set_output(struct as3645a *flash, bool strobe)
 251 {
 252         enum as_mode mode;
 253         bool on;
 254
 255         switch (flash->led_mode) {
 256         case V4L2_FLASH_LED_MODE_NONE:
 257                 on = flash->indicator_current != 0;
 258                 mode = AS_MODE_INDICATOR;
 259                 break;
 260         case V4L2_FLASH_LED_MODE_TORCH:
 261                 on = true;
 262                 mode = AS_MODE_ASSIST;
 263                 break;
 264         case V4L2_FLASH_LED_MODE_FLASH:
 265                 on = strobe;
 266                 mode = AS_MODE_FLASH;
 267                 break;
 268         default:
 269                 BUG();
 270         }
 271
 272         /* Configure output parameters and operation mode. */
 273         return as3645a_set_control(flash, mode, on);
 274 }
 275
 276 /* -----------------------------------------------------------------------------
 277  * V4L2 controls
 278  */
 279
 280 static int as3645a_is_active(struct as3645a *flash)
 281 {
 282         int ret;
 283
 284         ret = as3645a_read(flash, AS_CONTROL_REG);
 285         return ret < 0 ? ret : !!(ret & AS_CONTROL_OUT_ON);
 286 }
 287
 288 static int as3645a_read_fault(struct as3645a *flash)
 289 {
 290         struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev);
 291         int rval;
 292
 293         /* NOTE: reading register clear fault status */
 294         rval = as3645a_read(flash, AS_FAULT_INFO_REG);
 295         if (rval < 0)
 296                 return rval;
 297
 298         if (rval & AS_FAULT_INFO_INDUCTOR_PEAK_LIMIT)
 299                 dev_dbg(&client->dev, "Inductor Peak limit fault\n");
 300
 301         if (rval & AS_FAULT_INFO_INDICATOR_LED)
 302                 dev_dbg(&client->dev, "Indicator LED fault: "
 303                         "Short circuit or open loop\n");
 304
 305         dev_dbg(&client->dev, "%u connected LEDs\n",
 306                 rval & AS_FAULT_INFO_LED_AMOUNT ? 2 : 1);
 307
 308         if (rval & AS_FAULT_INFO_TIMEOUT)
 309                 dev_dbg(&client->dev, "Timeout fault\n");
 310
 311         if (rval & AS_FAULT_INFO_OVER_TEMPERATURE)
 312                 dev_dbg(&client->dev, "Over temperature fault\n");
 313
 314         if (rval & AS_FAULT_INFO_SHORT_CIRCUIT)
 315                 dev_dbg(&client->dev, "Short circuit fault\n");
 316
 317         if (rval & AS_FAULT_INFO_OVER_VOLTAGE)
 318                 dev_dbg(&client->dev, "Over voltage fault: "
 319                         "Indicates missing capacitor or open connection\n");
 320
 321         return rval;
 322 }
 323
 324 static int as3645a_get_ctrl(struct v4l2_ctrl *ctrl)
 325 {
 326         struct as3645a *flash =
 327                 container_of(ctrl->handler, struct as3645a, ctrls);
 328         struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev);
 329         int value;
 330
 331         switch (ctrl->id) {
 332         case V4L2_CID_FLASH_FAULT:
 333                 value = as3645a_read_fault(flash);
 334                 if (value < 0)
 335                         return value;
 336
 337                 ctrl->cur.val = 0;
 338                 if (value & AS_FAULT_INFO_SHORT_CIRCUIT)
 339                         ctrl->cur.val |= V4L2_FLASH_FAULT_SHORT_CIRCUIT;
 340                 if (value & AS_FAULT_INFO_OVER_TEMPERATURE)
 341                         ctrl->cur.val |= V4L2_FLASH_FAULT_OVER_TEMPERATURE;
 342                 if (value & AS_FAULT_INFO_TIMEOUT)
 343                         ctrl->cur.val |= V4L2_FLASH_FAULT_TIMEOUT;
 344                 if (value & AS_FAULT_INFO_OVER_VOLTAGE)
 345                         ctrl->cur.val |= V4L2_FLASH_FAULT_OVER_VOLTAGE;
 346                 if (value & AS_FAULT_INFO_INDUCTOR_PEAK_LIMIT)
 347                         ctrl->cur.val |= V4L2_FLASH_FAULT_OVER_CURRENT;
 348                 if (value & AS_FAULT_INFO_INDICATOR_LED)
 349                         ctrl->cur.val |= V4L2_FLASH_FAULT_INDICATOR;
 350                 break;
 351
 352         case V4L2_CID_FLASH_STROBE_STATUS:
 353                 if (flash->led_mode != V4L2_FLASH_LED_MODE_FLASH) {
 354                         ctrl->cur.val = 0;
 355                         break;
 356                 }
 357
 358                 value = as3645a_is_active(flash);
 359                 if (value < 0)
 360                         return value;
 361
 362                 ctrl->cur.val = value;
 363                 break;
 364         }
 365
 366         dev_dbg(&client->dev, "G_CTRL %08x:%d\n", ctrl->id, ctrl->cur.val);
 367
 368         return 0;
 369 }
 370
 371 static int as3645a_set_ctrl(struct v4l2_ctrl *ctrl)
 372 {
 373         struct as3645a *flash =
 374                 container_of(ctrl->handler, struct as3645a, ctrls);
 375         struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev);
 376         int ret;
 377
 378         dev_dbg(&client->dev, "S_CTRL %08x:%d\n", ctrl->id, ctrl->val);
 379
 380         /* If a control that doesn't apply to the current mode is modified,
 381          * we store the value and return immediately. The setting will be
 382          * applied when the LED mode is changed. Otherwise we apply the setting
 383          * immediately.
 384          */
 385
 386         switch (ctrl->id) {
 387         case V4L2_CID_FLASH_LED_MODE:
 388                 if (flash->indicator_current)
 389                         return -EBUSY;
 390
 391                 ret = as3645a_set_config(flash);
 392                 if (ret < 0)
 393                         return ret;
 394
 395                 flash->led_mode = ctrl->val;
 396                 return as3645a_set_output(flash, false);
 397
 398         case V4L2_CID_FLASH_STROBE_SOURCE:
 399                 flash->strobe_source = ctrl->val;
 400
 401                 /* Applies to flash mode only. */
 402                 if (flash->led_mode != V4L2_FLASH_LED_MODE_FLASH)
 403                         break;
 404
 405                 return as3645a_set_output(flash, false);
 406
 407         case V4L2_CID_FLASH_STROBE:
 408                 if (flash->led_mode != V4L2_FLASH_LED_MODE_FLASH)
 409                         return -EBUSY;
 410
 411                 return as3645a_set_output(flash, true);
 412
 413         case V4L2_CID_FLASH_STROBE_STOP:
 414                 if (flash->led_mode != V4L2_FLASH_LED_MODE_FLASH)
 415                         return -EBUSY;
 416
 417                 return as3645a_set_output(flash, false);
 418
 419         case V4L2_CID_FLASH_TIMEOUT:
 420                 flash->timeout = ctrl->val;
 421
 422                 /* Applies to flash mode only. */
 423                 if (flash->led_mode != V4L2_FLASH_LED_MODE_FLASH)
 424                         break;
 425
 426                 return as3645a_set_config(flash);
 427
 428         case V4L2_CID_FLASH_INTENSITY:
 429                 flash->flash_current = (ctrl->val - AS3645A_FLASH_INTENSITY_MIN)
 430                                      / AS3645A_FLASH_INTENSITY_STEP;
 431
 432                 /* Applies to flash mode only. */
 433                 if (flash->led_mode != V4L2_FLASH_LED_MODE_FLASH)
 434                         break;
 435
 436                 return as3645a_set_config(flash);
 437
 438         case V4L2_CID_FLASH_TORCH_INTENSITY:
 439                 flash->assist_current =
 440                         (ctrl->val - AS3645A_TORCH_INTENSITY_MIN)
 441                         / AS3645A_TORCH_INTENSITY_STEP;
 442
 443                 /* Applies to torch mode only. */
 444                 if (flash->led_mode != V4L2_FLASH_LED_MODE_TORCH)
 445                         break;
 446
 447                 return as3645a_set_config(flash);
 448
 449         case V4L2_CID_FLASH_INDICATOR_INTENSITY:
 450                 if (flash->led_mode != V4L2_FLASH_LED_MODE_NONE)
 451                         return -EBUSY;
 452
 453                 flash->indicator_current =
 454                         (ctrl->val - AS3645A_INDICATOR_INTENSITY_MIN)
 455                         / AS3645A_INDICATOR_INTENSITY_STEP;
 456
 457                 ret = as3645a_set_config(flash);
 458                 if (ret < 0)
 459                         return ret;
 460
 461                 if ((ctrl->val == 0) == (ctrl->cur.val == 0))
 462                         break;
 463
 464                 return as3645a_set_output(flash, false);
 465         }
 466
 467         return 0;
 468 }
 469
 470 static const struct v4l2_ctrl_ops as3645a_ctrl_ops = {
 471         .g_volatile_ctrl = as3645a_get_ctrl,
 472         .s_ctrl = as3645a_set_ctrl,
 473 };
 474
 475 /* -----------------------------------------------------------------------------
 476  * V4L2 subdev core operations
 477  */
 478
 479 /* Put device into know state. */
 480 static int as3645a_setup(struct as3645a *flash)
 481 {
 482         struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev);
 483         int ret;
 484
 485         /* clear errors */
 486         ret = as3645a_read(flash, AS_FAULT_INFO_REG);
 487         if (ret < 0)
 488                 return ret;
 489
 490         dev_dbg(&client->dev, "Fault info: %02x\n", ret);
 491
 492         ret = as3645a_set_config(flash);
 493         if (ret < 0)
 494                 return ret;
 495
 496         ret = as3645a_set_output(flash, false);
 497         if (ret < 0)
 498                 return ret;
 499
 500         /* read status */
 501         ret = as3645a_read_fault(flash);
 502         if (ret < 0)
 503                 return ret;
 504
 505         dev_dbg(&client->dev, "AS_INDICATOR_AND_TIMER_REG: %02x\n",
 506                 as3645a_read(flash, AS_INDICATOR_AND_TIMER_REG));
 507         dev_dbg(&client->dev, "AS_CURRENT_SET_REG: %02x\n",
 508                 as3645a_read(flash, AS_CURRENT_SET_REG));
 509         dev_dbg(&client->dev, "AS_CONTROL_REG: %02x\n",
 510                 as3645a_read(flash, AS_CONTROL_REG));
 511
 512         return ret & ~AS_FAULT_INFO_LED_AMOUNT ? -EIO : 0;
 513 }
 514
 515 static int __as3645a_set_power(struct as3645a *flash, int on)
 516 {
 517         int ret;
 518
 519         if (!on)
 520                 as3645a_set_control(flash, AS_MODE_EXT_TORCH, false);
 521
 522         if (flash->pdata->set_power) {
 523                 ret = flash->pdata->set_power(&flash->subdev, on);
 524                 if (ret < 0)
 525                         return ret;
 526         }
 527
 528         if (!on)
 529                 return 0;
 530
 531         ret = as3645a_setup(flash);
 532         if (ret < 0) {
 533                 if (flash->pdata->set_power)
 534                         flash->pdata->set_power(&flash->subdev, 0);
 535         }
 536
 537         return ret;
 538 }
 539
 540 static int as3645a_set_power(struct v4l2_subdev *sd, int on)
 541 {
 542         struct as3645a *flash = to_as3645a(sd);
 543         int ret = 0;
 544
 545         mutex_lock(&flash->power_lock);
 546
 547         if (flash->power_count == !on) {
 548                 ret = __as3645a_set_power(flash, !!on);
 549                 if (ret < 0)
 550                         goto done;
 551         }
 552
 553         flash->power_count += on ? 1 : -1;
 554         WARN_ON(flash->power_count < 0);
 555
 556 done:
 557         mutex_unlock(&flash->power_lock);
 558         return ret;
 559 }
 560
 561 static int as3645a_registered(struct v4l2_subdev *sd)
 562 {
 563         struct as3645a *flash = to_as3645a(sd);
 564         struct i2c_client *client = v4l2_get_subdevdata(sd);
 565         int rval, man, model, rfu, version;
 566         const char *vendor;
 567
 568         /* Power up the flash driver and read manufacturer ID, model ID, RFU
 569          * and version.
 570          */
 571         rval = as3645a_set_power(&flash->subdev, 1);
 572         if (rval < 0)
 573                 return rval;
 574
 575         rval = as3645a_read(flash, AS_DESIGN_INFO_REG);
 576         if (rval < 0)
 577                 goto power_off;
 578
 579         man = AS_DESIGN_INFO_FACTORY(rval);
 580         model = AS_DESIGN_INFO_MODEL(rval);
 581
 582         rval = as3645a_read(flash, AS_VERSION_CONTROL_REG);
 583         if (rval < 0)
 584                 goto power_off;
 585
 586         rfu = AS_VERSION_CONTROL_RFU(rval);
 587         version = AS_VERSION_CONTROL_VERSION(rval);
 588
 589         /* Verify the chip model and version. */
 590         if (model != 0x01 || rfu != 0x00) {
 591                 dev_err(&client->dev, "AS3645A not detected "
 592                         "(model %d rfu %d)\n", model, rfu);
 593                 rval = -ENODEV;
 594                 goto power_off;
 595         }
 596
 597         switch (man) {
 598         case 1:
 599                 vendor = "AMS, Austria Micro Systems";
 600                 break;
 601         case 2:
 602                 vendor = "ADI, Analog Devices Inc.";
 603                 break;
 604         case 3:
 605                 vendor = "NSC, National Semiconductor";
 606                 break;
 607         case 4:
 608                 vendor = "NXP";
 609                 break;
 610         case 5:
 611                 vendor = "TI, Texas Instrument";
 612                 break;
 613         default:
 614                 vendor = "Unknown";
 615         }
 616
 617         dev_info(&client->dev, "Chip vendor: %s (%d) Version: %d\n", vendor,
 618                  man, version);
 619
 620         rval = as3645a_write(flash, AS_PASSWORD_REG, AS_PASSWORD_UNLOCK_VALUE);
 621         if (rval < 0)
 622                 goto power_off;
 623
 624         rval = as3645a_write(flash, AS_BOOST_REG, AS_BOOST_CURRENT_DISABLE);
 625         if (rval < 0)
 626                 goto power_off;
 627
 628         /* Setup default values. This makes sure that the chip is in a known
 629          * state, in case the power rail can't be controlled.
 630          */
 631         rval = as3645a_setup(flash);
 632
 633 power_off:
 634         as3645a_set_power(&flash->subdev, 0);
 635
 636         return rval;
 637 }
 638
 639 static int as3645a_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
 640 {
 641         return as3645a_set_power(sd, 1);
 642 }
 643
 644 static int as3645a_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
 645 {
 646         return as3645a_set_power(sd, 0);
 647 }
 648
 649 static const struct v4l2_subdev_core_ops as3645a_core_ops = {
 650         .s_power                = as3645a_set_power,
 651 };
 652
 653 static const struct v4l2_subdev_ops as3645a_ops = {
 654         .core = &as3645a_core_ops,
 655 };
 656
 657 static const struct v4l2_subdev_internal_ops as3645a_internal_ops = {
 658         .registered = as3645a_registered,
 659         .open = as3645a_open,
 660         .close = as3645a_close,
 661 };
 662
 663 /* -----------------------------------------------------------------------------
 664  *  I2C driver
 665  */
 666 #ifdef CONFIG_PM
 667
 668 static int as3645a_suspend(struct device *dev)
 669 {
 670         struct i2c_client *client = to_i2c_client(dev);
 671         struct v4l2_subdev *subdev = i2c_get_clientdata(client);
 672         struct as3645a *flash = to_as3645a(subdev);
 673         int rval;
 674
 675         if (flash->power_count == 0)
 676                 return 0;
 677
 678         rval = __as3645a_set_power(flash, 0);
 679
 680         dev_dbg(&client->dev, "Suspend %s\n", rval < 0 ? "failed" : "ok");
 681
 682         return rval;
 683 }
 684
 685 static int as3645a_resume(struct device *dev)
 686 {
 687         struct i2c_client *client = to_i2c_client(dev);
 688         struct v4l2_subdev *subdev = i2c_get_clientdata(client);
 689         struct as3645a *flash = to_as3645a(subdev);
 690         int rval;
 691
 692         if (flash->power_count == 0)
 693                 return 0;
 694
 695         rval = __as3645a_set_power(flash, 1);
 696
 697         dev_dbg(&client->dev, "Resume %s\n", rval < 0 ? "fail" : "ok");
 698
 699         return rval;
 700 }
 701
 702 #else
 703
 704 #define as3645a_suspend NULL
 705 #define as3645a_resume  NULL
 706
 707 #endif /* CONFIG_PM */
 708
 709 /*
 710  * as3645a_init_controls - Create controls
 711  * @flash: The flash
 712  *
 713  * The number of LEDs reported in platform data is used to compute default
 714  * limits. Parameters passed through platform data can override those limits.
 715  */
 716 static int as3645a_init_controls(struct as3645a *flash)
 717 {
 718         const struct as3645a_platform_data *pdata = flash->pdata;
 719         struct v4l2_ctrl *ctrl;
 720         int maximum;
 721
 722         v4l2_ctrl_handler_init(&flash->ctrls, 10);
 723
 724         /* V4L2_CID_FLASH_LED_MODE */
 725         v4l2_ctrl_new_std_menu(&flash->ctrls, &as3645a_ctrl_ops,
 726                                V4L2_CID_FLASH_LED_MODE, 2, ~7,
 727                                V4L2_FLASH_LED_MODE_NONE);
 728
 729         /* V4L2_CID_FLASH_STROBE_SOURCE */
 730         v4l2_ctrl_new_std_menu(&flash->ctrls, &as3645a_ctrl_ops,
 731                                V4L2_CID_FLASH_STROBE_SOURCE,
 732                                pdata->ext_strobe ? 1 : 0,
 733                                pdata->ext_strobe ? ~3 : ~1,
 734                                V4L2_FLASH_STROBE_SOURCE_SOFTWARE);
 735
 736         flash->strobe_source = V4L2_FLASH_STROBE_SOURCE_SOFTWARE;
 737
 738         /* V4L2_CID_FLASH_STROBE */
 739         v4l2_ctrl_new_std(&flash->ctrls, &as3645a_ctrl_ops,
 740                           V4L2_CID_FLASH_STROBE, 0, 0, 0, 0);
 741
 742         /* V4L2_CID_FLASH_STROBE_STOP */
 743         v4l2_ctrl_new_std(&flash->ctrls, &as3645a_ctrl_ops,
 744                           V4L2_CID_FLASH_STROBE_STOP, 0, 0, 0, 0);
 745
 746         /* V4L2_CID_FLASH_STROBE_STATUS */
 747         ctrl = v4l2_ctrl_new_std(&flash->ctrls, &as3645a_ctrl_ops,
 748                                  V4L2_CID_FLASH_STROBE_STATUS, 0, 1, 1, 1);
 749         if (ctrl != NULL)
 750                 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
 751
 752         /* V4L2_CID_FLASH_TIMEOUT */
 753         maximum = pdata->timeout_max;
 754
 755         v4l2_ctrl_new_std(&flash->ctrls, &as3645a_ctrl_ops,
 756                           V4L2_CID_FLASH_TIMEOUT, AS3645A_FLASH_TIMEOUT_MIN,
 757                           maximum, AS3645A_FLASH_TIMEOUT_STEP, maximum);
 758
 759         flash->timeout = maximum;
 760
 761         /* V4L2_CID_FLASH_INTENSITY */
 762         maximum = pdata->flash_max_current;
 763
 764         v4l2_ctrl_new_std(&flash->ctrls, &as3645a_ctrl_ops,
 765                           V4L2_CID_FLASH_INTENSITY, AS3645A_FLASH_INTENSITY_MIN,
 766                           maximum, AS3645A_FLASH_INTENSITY_STEP, maximum);
 767
 768         flash->flash_current = (maximum - AS3645A_FLASH_INTENSITY_MIN)
 769                              / AS3645A_FLASH_INTENSITY_STEP;
 770
 771         /* V4L2_CID_FLASH_TORCH_INTENSITY */
 772         maximum = pdata->torch_max_current;
 773
 774         v4l2_ctrl_new_std(&flash->ctrls, &as3645a_ctrl_ops,
 775                           V4L2_CID_FLASH_TORCH_INTENSITY,
 776                           AS3645A_TORCH_INTENSITY_MIN, maximum,
 777                           AS3645A_TORCH_INTENSITY_STEP,
 778                           AS3645A_TORCH_INTENSITY_MIN);
 779
 780         flash->assist_current = 0;
 781
 782         /* V4L2_CID_FLASH_INDICATOR_INTENSITY */
 783         v4l2_ctrl_new_std(&flash->ctrls, &as3645a_ctrl_ops,
 784                           V4L2_CID_FLASH_INDICATOR_INTENSITY,
 785                           AS3645A_INDICATOR_INTENSITY_MIN,
 786                           AS3645A_INDICATOR_INTENSITY_MAX,
 787                           AS3645A_INDICATOR_INTENSITY_STEP,
 788                           AS3645A_INDICATOR_INTENSITY_MIN);
 789
 790         flash->indicator_current = 0;
 791
 792         /* V4L2_CID_FLASH_FAULT */
 793         ctrl = v4l2_ctrl_new_std(&flash->ctrls, &as3645a_ctrl_ops,
 794                                  V4L2_CID_FLASH_FAULT, 0,
 795                                  V4L2_FLASH_FAULT_OVER_VOLTAGE |
 796                                  V4L2_FLASH_FAULT_TIMEOUT |
 797                                  V4L2_FLASH_FAULT_OVER_TEMPERATURE |
 798                                  V4L2_FLASH_FAULT_SHORT_CIRCUIT, 0, 0);
 799         if (ctrl != NULL)
 800                 ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
 801
 802         flash->subdev.ctrl_handler = &flash->ctrls;
 803
 804         return flash->ctrls.error;
 805 }
 806
 807 static int as3645a_probe(struct i2c_client *client,
 808                          const struct i2c_device_id *devid)
 809 {
 810         struct as3645a *flash;
 811         int ret;
 812
 813         if (client->dev.platform_data == NULL)
 814                 return -ENODEV;
 815
 816         flash = devm_kzalloc(&client->dev, sizeof(*flash), GFP_KERNEL);
 817         if (flash == NULL)
 818                 return -ENOMEM;
 819
 820         flash->pdata = client->dev.platform_data;
 821
 822         v4l2_i2c_subdev_init(&flash->subdev, client, &as3645a_ops);
 823         flash->subdev.internal_ops = &as3645a_internal_ops;
 824         flash->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
 825
 826         ret = as3645a_init_controls(flash);
 827         if (ret < 0)
 828                 goto done;
 829
 830         ret = media_entity_pads_init(&flash->subdev.entity, 0, NULL);
 831         if (ret < 0)
 832                 goto done;
 833
 834         flash->subdev.entity.function = MEDIA_ENT_F_FLASH;
 835
 836         mutex_init(&flash->power_lock);
 837
 838         flash->led_mode = V4L2_FLASH_LED_MODE_NONE;
 839
 840 done:
 841         if (ret < 0)
 842                 v4l2_ctrl_handler_free(&flash->ctrls);
 843
 844         return ret;
 845 }
 846
 847 static int as3645a_remove(struct i2c_client *client)
 848 {
 849         struct v4l2_subdev *subdev = i2c_get_clientdata(client);
 850         struct as3645a *flash = to_as3645a(subdev);
 851
 852         v4l2_device_unregister_subdev(subdev);
 853         v4l2_ctrl_handler_free(&flash->ctrls);
 854         media_entity_cleanup(&flash->subdev.entity);
 855         mutex_destroy(&flash->power_lock);
 856
 857         return 0;
 858 }
 859
 860 static const struct i2c_device_id as3645a_id_table[] = {
 861         { AS3645A_NAME, 0 },
 862         { },
 863 };
 864 MODULE_DEVICE_TABLE(i2c, as3645a_id_table);
 865
 866 static const struct dev_pm_ops as3645a_pm_ops = {
 867         .suspend = as3645a_suspend,
 868         .resume = as3645a_resume,
 869 };
 870
 871 static struct i2c_driver as3645a_i2c_driver = {
 872         .driver = {
 873                 .name = AS3645A_NAME,
 874                 .pm   = &as3645a_pm_ops,
 875         },
 876         .probe  = as3645a_probe,
 877         .remove = as3645a_remove,
 878         .id_table = as3645a_id_table,
 879 };
 880
 881 module_i2c_driver(as3645a_i2c_driver);
 882
 883 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
 884 MODULE_DESCRIPTION("LED flash driver for AS3645A, LM3555 and their clones");
 885 MODULE_LICENSE("GPL");