drivers/media/video/adp1653.c

   1 /*
   2  * drivers/media/video/adp1653.c
   3  *
   4  * Copyright (C) 2008--2011 Nokia Corporation
   5  *
   6  * Contact: Sakari Ailus <sakari.ailus@maxwell.research.nokia.com>
   7  *
   8  * Contributors:
   9  *      Sakari Ailus <sakari.ailus@maxwell.research.nokia.com>
  10  *      Tuukka Toivonen <tuukkat76@gmail.com>
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * version 2 as published by the Free Software Foundation.
  15  *
  16  * This program is distributed in the hope that it will be useful, but
  17  * WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19  * General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  24  * 02110-1301 USA
  25  *
  26  * TODO:
  27  * - fault interrupt handling
  28  * - hardware strobe
  29  * - power doesn't need to be ON if all lights are off
  30  *
  31  */
  32
  33 #include <linux/delay.h>
  34 #include <linux/i2c.h>
  35 #include <linux/module.h>
  36 #include <linux/slab.h>
  37 #include <linux/version.h>
  38 #include <media/adp1653.h>
  39 #include <media/v4l2-device.h>
  40
  41 #define TIMEOUT_MAX             820000
  42 #define TIMEOUT_STEP            54600
  43 #define TIMEOUT_MIN             (TIMEOUT_MAX - ADP1653_REG_CONFIG_TMR_SET_MAX \
  44                                  * TIMEOUT_STEP)
  45 #define TIMEOUT_US_TO_CODE(t)   ((TIMEOUT_MAX + (TIMEOUT_STEP / 2) - (t)) \
  46                                  / TIMEOUT_STEP)
  47 #define TIMEOUT_CODE_TO_US(c)   (TIMEOUT_MAX - (c) * TIMEOUT_STEP)
  48
  49 /* Write values into ADP1653 registers. */
  50 static int adp1653_update_hw(struct adp1653_flash *flash)
  51 {
  52         struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev);
  53         u8 out_sel;
  54         u8 config = 0;
  55         int rval;
  56
  57         out_sel = ADP1653_INDICATOR_INTENSITY_uA_TO_REG(
  58                 flash->indicator_intensity->val)
  59                 << ADP1653_REG_OUT_SEL_ILED_SHIFT;
  60
  61         switch (flash->led_mode->val) {
  62         case V4L2_FLASH_LED_MODE_NONE:
  63                 break;
  64         case V4L2_FLASH_LED_MODE_FLASH:
  65                 /* Flash mode, light on with strobe, duration from timer */
  66                 config = ADP1653_REG_CONFIG_TMR_CFG;
  67                 config |= TIMEOUT_US_TO_CODE(flash->flash_timeout->val)
  68                           << ADP1653_REG_CONFIG_TMR_SET_SHIFT;
  69                 break;
  70         case V4L2_FLASH_LED_MODE_TORCH:
  71                 /* Torch mode, light immediately on, duration indefinite */
  72                 out_sel |= ADP1653_FLASH_INTENSITY_mA_TO_REG(
  73                         flash->torch_intensity->val)
  74                         << ADP1653_REG_OUT_SEL_HPLED_SHIFT;
  75                 break;
  76         }
  77
  78         rval = i2c_smbus_write_byte_data(client, ADP1653_REG_OUT_SEL, out_sel);
  79         if (rval < 0)
  80                 return rval;
  81
  82         rval = i2c_smbus_write_byte_data(client, ADP1653_REG_CONFIG, config);
  83         if (rval < 0)
  84                 return rval;
  85
  86         return 0;
  87 }
  88
  89 static int adp1653_get_fault(struct adp1653_flash *flash)
  90 {
  91         struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev);
  92         int fault;
  93         int rval;
  94
  95         fault = i2c_smbus_read_byte_data(client, ADP1653_REG_FAULT);
  96         if (IS_ERR_VALUE(fault))
  97                 return fault;
  98
  99         flash->fault |= fault;
 100
 101         if (!flash->fault)
 102                 return 0;
 103
 104         /* Clear faults. */
 105         rval = i2c_smbus_write_byte_data(client, ADP1653_REG_OUT_SEL, 0);
 106         if (IS_ERR_VALUE(rval))
 107                 return rval;
 108
 109         flash->led_mode->val = V4L2_FLASH_LED_MODE_NONE;
 110
 111         rval = adp1653_update_hw(flash);
 112         if (IS_ERR_VALUE(rval))
 113                 return rval;
 114
 115         return flash->fault;
 116 }
 117
 118 static int adp1653_strobe(struct adp1653_flash *flash, int enable)
 119 {
 120         struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev);
 121         u8 out_sel = ADP1653_INDICATOR_INTENSITY_uA_TO_REG(
 122                 flash->indicator_intensity->val)
 123                 << ADP1653_REG_OUT_SEL_ILED_SHIFT;
 124         int rval;
 125
 126         if (flash->led_mode->val != V4L2_FLASH_LED_MODE_FLASH)
 127                 return -EBUSY;
 128
 129         if (!enable)
 130                 return i2c_smbus_write_byte_data(client, ADP1653_REG_OUT_SEL,
 131                                                  out_sel);
 132
 133         out_sel |= ADP1653_FLASH_INTENSITY_mA_TO_REG(
 134                 flash->flash_intensity->val)
 135                 << ADP1653_REG_OUT_SEL_HPLED_SHIFT;
 136         rval = i2c_smbus_write_byte_data(client, ADP1653_REG_OUT_SEL, out_sel);
 137         if (rval)
 138                 return rval;
 139
 140         /* Software strobe using i2c */
 141         rval = i2c_smbus_write_byte_data(client, ADP1653_REG_SW_STROBE,
 142                 ADP1653_REG_SW_STROBE_SW_STROBE);
 143         if (rval)
 144                 return rval;
 145         return i2c_smbus_write_byte_data(client, ADP1653_REG_SW_STROBE, 0);
 146 }
 147
 148 /* --------------------------------------------------------------------------
 149  * V4L2 controls
 150  */
 151
 152 static int adp1653_get_ctrl(struct v4l2_ctrl *ctrl)
 153 {
 154         struct adp1653_flash *flash =
 155                 container_of(ctrl->handler, struct adp1653_flash, ctrls);
 156         int rval;
 157
 158         rval = adp1653_get_fault(flash);
 159         if (IS_ERR_VALUE(rval))
 160                 return rval;
 161
 162         ctrl->cur.val = 0;
 163
 164         if (flash->fault & ADP1653_REG_FAULT_FLT_SCP)
 165                 ctrl->cur.val |= V4L2_FLASH_FAULT_SHORT_CIRCUIT;
 166         if (flash->fault & ADP1653_REG_FAULT_FLT_OT)
 167                 ctrl->cur.val |= V4L2_FLASH_FAULT_OVER_TEMPERATURE;
 168         if (flash->fault & ADP1653_REG_FAULT_FLT_TMR)
 169                 ctrl->cur.val |= V4L2_FLASH_FAULT_TIMEOUT;
 170         if (flash->fault & ADP1653_REG_FAULT_FLT_OV)
 171                 ctrl->cur.val |= V4L2_FLASH_FAULT_OVER_VOLTAGE;
 172
 173         flash->fault = 0;
 174
 175         return 0;
 176 }
 177
 178 static int adp1653_set_ctrl(struct v4l2_ctrl *ctrl)
 179 {
 180         struct adp1653_flash *flash =
 181                 container_of(ctrl->handler, struct adp1653_flash, ctrls);
 182         int rval;
 183
 184         rval = adp1653_get_fault(flash);
 185         if (IS_ERR_VALUE(rval))
 186                 return rval;
 187         if ((rval & (ADP1653_REG_FAULT_FLT_SCP |
 188                      ADP1653_REG_FAULT_FLT_OT |
 189                      ADP1653_REG_FAULT_FLT_OV)) &&
 190             (ctrl->id == V4L2_CID_FLASH_STROBE ||
 191              ctrl->id == V4L2_CID_FLASH_TORCH_INTENSITY ||
 192              ctrl->id == V4L2_CID_FLASH_LED_MODE))
 193                 return -EBUSY;
 194
 195         switch (ctrl->id) {
 196         case V4L2_CID_FLASH_STROBE:
 197                 return adp1653_strobe(flash, 1);
 198         case V4L2_CID_FLASH_STROBE_STOP:
 199                 return adp1653_strobe(flash, 0);
 200         }
 201
 202         return adp1653_update_hw(flash);
 203 }
 204
 205 static const struct v4l2_ctrl_ops adp1653_ctrl_ops = {
 206         .g_volatile_ctrl = adp1653_get_ctrl,
 207         .s_ctrl = adp1653_set_ctrl,
 208 };
 209
 210 static int adp1653_init_controls(struct adp1653_flash *flash)
 211 {
 212         struct v4l2_ctrl *fault;
 213
 214         v4l2_ctrl_handler_init(&flash->ctrls, 9);
 215
 216         flash->led_mode =
 217                 v4l2_ctrl_new_std_menu(&flash->ctrls, &adp1653_ctrl_ops,
 218                                        V4L2_CID_FLASH_LED_MODE,
 219                                        V4L2_FLASH_LED_MODE_TORCH, ~0x7, 0);
 220         v4l2_ctrl_new_std_menu(&flash->ctrls, &adp1653_ctrl_ops,
 221                                V4L2_CID_FLASH_STROBE_SOURCE,
 222                                V4L2_FLASH_STROBE_SOURCE_SOFTWARE, ~0x1, 0);
 223         v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops,
 224                           V4L2_CID_FLASH_STROBE, 0, 0, 0, 0);
 225         v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops,
 226                           V4L2_CID_FLASH_STROBE_STOP, 0, 0, 0, 0);
 227         flash->flash_timeout =
 228                 v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops,
 229                                   V4L2_CID_FLASH_TIMEOUT, TIMEOUT_MIN,
 230                                   flash->platform_data->max_flash_timeout,
 231                                   TIMEOUT_STEP,
 232                                   flash->platform_data->max_flash_timeout);
 233         flash->flash_intensity =
 234                 v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops,
 235                                   V4L2_CID_FLASH_INTENSITY,
 236                                   ADP1653_FLASH_INTENSITY_MIN,
 237                                   flash->platform_data->max_flash_intensity,
 238                                   1, flash->platform_data->max_flash_intensity);
 239         flash->torch_intensity =
 240                 v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops,
 241                                   V4L2_CID_FLASH_TORCH_INTENSITY,
 242                                   ADP1653_TORCH_INTENSITY_MIN,
 243                                   flash->platform_data->max_torch_intensity,
 244                                   ADP1653_FLASH_INTENSITY_STEP,
 245                                   flash->platform_data->max_torch_intensity);
 246         flash->indicator_intensity =
 247                 v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops,
 248                                   V4L2_CID_FLASH_INDICATOR_INTENSITY,
 249                                   ADP1653_INDICATOR_INTENSITY_MIN,
 250                                   flash->platform_data->max_indicator_intensity,
 251                                   ADP1653_INDICATOR_INTENSITY_STEP,
 252                                   ADP1653_INDICATOR_INTENSITY_MIN);
 253         fault = v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops,
 254                                   V4L2_CID_FLASH_FAULT, 0,
 255                                   V4L2_FLASH_FAULT_OVER_VOLTAGE
 256                                   | V4L2_FLASH_FAULT_OVER_TEMPERATURE
 257                                   | V4L2_FLASH_FAULT_SHORT_CIRCUIT, 0, 0);
 258
 259         if (flash->ctrls.error)
 260                 return flash->ctrls.error;
 261
 262         fault->flags |= V4L2_CTRL_FLAG_VOLATILE;
 263
 264         flash->subdev.ctrl_handler = &flash->ctrls;
 265         return 0;
 266 }
 267
 268 /* --------------------------------------------------------------------------
 269  * V4L2 subdev operations
 270  */
 271
 272 static int
 273 adp1653_init_device(struct adp1653_flash *flash)
 274 {
 275         struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev);
 276         int rval;
 277
 278         /* Clear FAULT register by writing zero to OUT_SEL */
 279         rval = i2c_smbus_write_byte_data(client, ADP1653_REG_OUT_SEL, 0);
 280         if (rval < 0) {
 281                 dev_err(&client->dev, "failed writing fault register\n");
 282                 return -EIO;
 283         }
 284
 285         mutex_lock(&flash->ctrls.lock);
 286         /* Reset faults before reading new ones. */
 287         flash->fault = 0;
 288         rval = adp1653_get_fault(flash);
 289         mutex_unlock(&flash->ctrls.lock);
 290         if (rval > 0) {
 291                 dev_err(&client->dev, "faults detected: 0x%1.1x\n", rval);
 292                 return -EIO;
 293         }
 294
 295         mutex_lock(&flash->ctrls.lock);
 296         rval = adp1653_update_hw(flash);
 297         mutex_unlock(&flash->ctrls.lock);
 298         if (rval) {
 299                 dev_err(&client->dev,
 300                         "adp1653_update_hw failed at %s\n", __func__);
 301                 return -EIO;
 302         }
 303
 304         return 0;
 305 }
 306
 307 static int
 308 __adp1653_set_power(struct adp1653_flash *flash, int on)
 309 {
 310         int ret;
 311
 312         ret = flash->platform_data->power(&flash->subdev, on);
 313         if (ret < 0)
 314                 return ret;
 315
 316         if (!on)
 317                 return 0;
 318
 319         ret = adp1653_init_device(flash);
 320         if (ret < 0)
 321                 flash->platform_data->power(&flash->subdev, 0);
 322
 323         return ret;
 324 }
 325
 326 static int
 327 adp1653_set_power(struct v4l2_subdev *subdev, int on)
 328 {
 329         struct adp1653_flash *flash = to_adp1653_flash(subdev);
 330         int ret = 0;
 331
 332         mutex_lock(&flash->power_lock);
 333
 334         /* If the power count is modified from 0 to != 0 or from != 0 to 0,
 335          * update the power state.
 336          */
 337         if (flash->power_count == !on) {
 338                 ret = __adp1653_set_power(flash, !!on);
 339                 if (ret < 0)
 340                         goto done;
 341         }
 342
 343         /* Update the power count. */
 344         flash->power_count += on ? 1 : -1;
 345         WARN_ON(flash->power_count < 0);
 346
 347 done:
 348         mutex_unlock(&flash->power_lock);
 349         return ret;
 350 }
 351
 352 static int adp1653_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
 353 {
 354         return adp1653_set_power(sd, 1);
 355 }
 356
 357 static int adp1653_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
 358 {
 359         return adp1653_set_power(sd, 0);
 360 }
 361
 362 static const struct v4l2_subdev_core_ops adp1653_core_ops = {
 363         .s_power = adp1653_set_power,
 364 };
 365
 366 static const struct v4l2_subdev_ops adp1653_ops = {
 367         .core = &adp1653_core_ops,
 368 };
 369
 370 static const struct v4l2_subdev_internal_ops adp1653_internal_ops = {
 371         .open = adp1653_open,
 372         .close = adp1653_close,
 373 };
 374
 375 /* --------------------------------------------------------------------------
 376  * I2C driver
 377  */
 378 #ifdef CONFIG_PM
 379
 380 static int adp1653_suspend(struct device *dev)
 381 {
 382         struct i2c_client *client = to_i2c_client(dev);
 383         struct v4l2_subdev *subdev = i2c_get_clientdata(client);
 384         struct adp1653_flash *flash = to_adp1653_flash(subdev);
 385
 386         if (!flash->power_count)
 387                 return 0;
 388
 389         return __adp1653_set_power(flash, 0);
 390 }
 391
 392 static int adp1653_resume(struct device *dev)
 393 {
 394         struct i2c_client *client = to_i2c_client(dev);
 395         struct v4l2_subdev *subdev = i2c_get_clientdata(client);
 396         struct adp1653_flash *flash = to_adp1653_flash(subdev);
 397
 398         if (!flash->power_count)
 399                 return 0;
 400
 401         return __adp1653_set_power(flash, 1);
 402 }
 403
 404 #else
 405
 406 #define adp1653_suspend NULL
 407 #define adp1653_resume  NULL
 408
 409 #endif /* CONFIG_PM */
 410
 411 static int adp1653_probe(struct i2c_client *client,
 412                          const struct i2c_device_id *devid)
 413 {
 414         struct adp1653_flash *flash;
 415         int ret;
 416
 417         /* we couldn't work without platform data */
 418         if (client->dev.platform_data == NULL)
 419                 return -ENODEV;
 420
 421         flash = kzalloc(sizeof(*flash), GFP_KERNEL);
 422         if (flash == NULL)
 423                 return -ENOMEM;
 424
 425         flash->platform_data = client->dev.platform_data;
 426
 427         mutex_init(&flash->power_lock);
 428
 429         v4l2_i2c_subdev_init(&flash->subdev, client, &adp1653_ops);
 430         flash->subdev.internal_ops = &adp1653_internal_ops;
 431         flash->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
 432
 433         ret = adp1653_init_controls(flash);
 434         if (ret)
 435                 goto free_and_quit;
 436
 437         ret = media_entity_init(&flash->subdev.entity, 0, NULL, 0);
 438         if (ret < 0)
 439                 goto free_and_quit;
 440
 441         flash->subdev.entity.type = MEDIA_ENT_T_V4L2_SUBDEV_FLASH;
 442
 443         return 0;
 444
 445 free_and_quit:
 446         v4l2_ctrl_handler_free(&flash->ctrls);
 447         kfree(flash);
 448         return ret;
 449 }
 450
 451 static int __exit adp1653_remove(struct i2c_client *client)
 452 {
 453         struct v4l2_subdev *subdev = i2c_get_clientdata(client);
 454         struct adp1653_flash *flash = to_adp1653_flash(subdev);
 455
 456         v4l2_device_unregister_subdev(&flash->subdev);
 457         v4l2_ctrl_handler_free(&flash->ctrls);
 458         media_entity_cleanup(&flash->subdev.entity);
 459         kfree(flash);
 460         return 0;
 461 }
 462
 463 static const struct i2c_device_id adp1653_id_table[] = {
 464         { ADP1653_NAME, 0 },
 465         { }
 466 };
 467 MODULE_DEVICE_TABLE(i2c, adp1653_id_table);
 468
 469 static struct dev_pm_ops adp1653_pm_ops = {
 470         .suspend        = adp1653_suspend,
 471         .resume         = adp1653_resume,
 472 };
 473
 474 static struct i2c_driver adp1653_i2c_driver = {
 475         .driver         = {
 476                 .name   = ADP1653_NAME,
 477                 .pm     = &adp1653_pm_ops,
 478         },
 479         .probe          = adp1653_probe,
 480         .remove         = __exit_p(adp1653_remove),
 481         .id_table       = adp1653_id_table,
 482 };
 483
 484 static int __init adp1653_init(void)
 485 {
 486         int rval;
 487
 488         rval = i2c_add_driver(&adp1653_i2c_driver);
 489         if (rval)
 490                 printk(KERN_ALERT "%s: failed at i2c_add_driver\n", __func__);
 491
 492         return rval;
 493 }
 494
 495 static void __exit adp1653_exit(void)
 496 {
 497         i2c_del_driver(&adp1653_i2c_driver);
 498 }
 499
 500 module_init(adp1653_init);
 501 module_exit(adp1653_exit);
 502
 503 MODULE_AUTHOR("Sakari Ailus <sakari.ailus@nokia.com>");
 504 MODULE_DESCRIPTION("Analog Devices ADP1653 LED flash driver");
 505 MODULE_LICENSE("GPL");