Sakari Ailus | 13abada | 2011-05-05 15:39:25 -0300 | [diff] [blame] | 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/slab.h> |
| 36 | #include <linux/version.h> |
| 37 | #include <media/adp1653.h> |
| 38 | #include <media/v4l2-device.h> |
| 39 | |
| 40 | #define TIMEOUT_MAX 820000 |
| 41 | #define TIMEOUT_STEP 54600 |
| 42 | #define TIMEOUT_MIN (TIMEOUT_MAX - ADP1653_REG_CONFIG_TMR_SET_MAX \ |
| 43 | * TIMEOUT_STEP) |
| 44 | #define TIMEOUT_US_TO_CODE(t) ((TIMEOUT_MAX + (TIMEOUT_STEP / 2) - (t)) \ |
| 45 | / TIMEOUT_STEP) |
| 46 | #define TIMEOUT_CODE_TO_US(c) (TIMEOUT_MAX - (c) * TIMEOUT_STEP) |
| 47 | |
| 48 | /* Write values into ADP1653 registers. */ |
| 49 | static int adp1653_update_hw(struct adp1653_flash *flash) |
| 50 | { |
| 51 | struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev); |
| 52 | u8 out_sel; |
| 53 | u8 config = 0; |
| 54 | int rval; |
| 55 | |
| 56 | out_sel = ADP1653_INDICATOR_INTENSITY_uA_TO_REG( |
| 57 | flash->indicator_intensity->val) |
| 58 | << ADP1653_REG_OUT_SEL_ILED_SHIFT; |
| 59 | |
| 60 | switch (flash->led_mode->val) { |
| 61 | case V4L2_FLASH_LED_MODE_NONE: |
| 62 | break; |
| 63 | case V4L2_FLASH_LED_MODE_FLASH: |
| 64 | /* Flash mode, light on with strobe, duration from timer */ |
| 65 | config = ADP1653_REG_CONFIG_TMR_CFG; |
| 66 | config |= TIMEOUT_US_TO_CODE(flash->flash_timeout->val) |
| 67 | << ADP1653_REG_CONFIG_TMR_SET_SHIFT; |
| 68 | break; |
| 69 | case V4L2_FLASH_LED_MODE_TORCH: |
| 70 | /* Torch mode, light immediately on, duration indefinite */ |
| 71 | out_sel |= ADP1653_FLASH_INTENSITY_mA_TO_REG( |
| 72 | flash->torch_intensity->val) |
| 73 | << ADP1653_REG_OUT_SEL_HPLED_SHIFT; |
| 74 | break; |
| 75 | } |
| 76 | |
| 77 | rval = i2c_smbus_write_byte_data(client, ADP1653_REG_OUT_SEL, out_sel); |
| 78 | if (rval < 0) |
| 79 | return rval; |
| 80 | |
| 81 | rval = i2c_smbus_write_byte_data(client, ADP1653_REG_CONFIG, config); |
| 82 | if (rval < 0) |
| 83 | return rval; |
| 84 | |
| 85 | return 0; |
| 86 | } |
| 87 | |
| 88 | static int adp1653_get_fault(struct adp1653_flash *flash) |
| 89 | { |
| 90 | struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev); |
| 91 | int fault; |
| 92 | int rval; |
| 93 | |
| 94 | fault = i2c_smbus_read_byte_data(client, ADP1653_REG_FAULT); |
| 95 | if (IS_ERR_VALUE(fault)) |
| 96 | return fault; |
| 97 | |
| 98 | flash->fault |= fault; |
| 99 | |
| 100 | if (!flash->fault) |
| 101 | return 0; |
| 102 | |
| 103 | /* Clear faults. */ |
| 104 | rval = i2c_smbus_write_byte_data(client, ADP1653_REG_OUT_SEL, 0); |
| 105 | if (IS_ERR_VALUE(rval)) |
| 106 | return rval; |
| 107 | |
| 108 | flash->led_mode->val = V4L2_FLASH_LED_MODE_NONE; |
| 109 | |
| 110 | rval = adp1653_update_hw(flash); |
| 111 | if (IS_ERR_VALUE(rval)) |
| 112 | return rval; |
| 113 | |
| 114 | return flash->fault; |
| 115 | } |
| 116 | |
| 117 | static int adp1653_strobe(struct adp1653_flash *flash, int enable) |
| 118 | { |
| 119 | struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev); |
| 120 | u8 out_sel = ADP1653_INDICATOR_INTENSITY_uA_TO_REG( |
| 121 | flash->indicator_intensity->val) |
| 122 | << ADP1653_REG_OUT_SEL_ILED_SHIFT; |
| 123 | int rval; |
| 124 | |
| 125 | if (flash->led_mode->val != V4L2_FLASH_LED_MODE_FLASH) |
| 126 | return -EBUSY; |
| 127 | |
| 128 | if (!enable) |
| 129 | return i2c_smbus_write_byte_data(client, ADP1653_REG_OUT_SEL, |
| 130 | out_sel); |
| 131 | |
| 132 | out_sel |= ADP1653_FLASH_INTENSITY_mA_TO_REG( |
| 133 | flash->flash_intensity->val) |
| 134 | << ADP1653_REG_OUT_SEL_HPLED_SHIFT; |
| 135 | rval = i2c_smbus_write_byte_data(client, ADP1653_REG_OUT_SEL, out_sel); |
| 136 | if (rval) |
| 137 | return rval; |
| 138 | |
| 139 | /* Software strobe using i2c */ |
| 140 | rval = i2c_smbus_write_byte_data(client, ADP1653_REG_SW_STROBE, |
| 141 | ADP1653_REG_SW_STROBE_SW_STROBE); |
| 142 | if (rval) |
| 143 | return rval; |
| 144 | return i2c_smbus_write_byte_data(client, ADP1653_REG_SW_STROBE, 0); |
| 145 | } |
| 146 | |
| 147 | /* -------------------------------------------------------------------------- |
| 148 | * V4L2 controls |
| 149 | */ |
| 150 | |
| 151 | static int adp1653_get_ctrl(struct v4l2_ctrl *ctrl) |
| 152 | { |
| 153 | struct adp1653_flash *flash = |
| 154 | container_of(ctrl->handler, struct adp1653_flash, ctrls); |
| 155 | int rval; |
| 156 | |
| 157 | rval = adp1653_get_fault(flash); |
| 158 | if (IS_ERR_VALUE(rval)) |
| 159 | return rval; |
| 160 | |
| 161 | ctrl->cur.val = 0; |
| 162 | |
| 163 | if (flash->fault & ADP1653_REG_FAULT_FLT_SCP) |
| 164 | ctrl->cur.val |= V4L2_FLASH_FAULT_SHORT_CIRCUIT; |
| 165 | if (flash->fault & ADP1653_REG_FAULT_FLT_OT) |
| 166 | ctrl->cur.val |= V4L2_FLASH_FAULT_OVER_TEMPERATURE; |
| 167 | if (flash->fault & ADP1653_REG_FAULT_FLT_TMR) |
| 168 | ctrl->cur.val |= V4L2_FLASH_FAULT_TIMEOUT; |
| 169 | if (flash->fault & ADP1653_REG_FAULT_FLT_OV) |
| 170 | ctrl->cur.val |= V4L2_FLASH_FAULT_OVER_VOLTAGE; |
| 171 | |
| 172 | flash->fault = 0; |
| 173 | |
| 174 | return 0; |
| 175 | } |
| 176 | |
| 177 | static int adp1653_set_ctrl(struct v4l2_ctrl *ctrl) |
| 178 | { |
| 179 | struct adp1653_flash *flash = |
| 180 | container_of(ctrl->handler, struct adp1653_flash, ctrls); |
| 181 | int rval; |
| 182 | |
| 183 | rval = adp1653_get_fault(flash); |
| 184 | if (IS_ERR_VALUE(rval)) |
| 185 | return rval; |
| 186 | if ((rval & (ADP1653_REG_FAULT_FLT_SCP | |
| 187 | ADP1653_REG_FAULT_FLT_OT | |
| 188 | ADP1653_REG_FAULT_FLT_OV)) && |
| 189 | (ctrl->id == V4L2_CID_FLASH_STROBE || |
| 190 | ctrl->id == V4L2_CID_FLASH_TORCH_INTENSITY || |
| 191 | ctrl->id == V4L2_CID_FLASH_LED_MODE)) |
| 192 | return -EBUSY; |
| 193 | |
| 194 | switch (ctrl->id) { |
| 195 | case V4L2_CID_FLASH_STROBE: |
| 196 | return adp1653_strobe(flash, 1); |
| 197 | case V4L2_CID_FLASH_STROBE_STOP: |
| 198 | return adp1653_strobe(flash, 0); |
| 199 | } |
| 200 | |
| 201 | return adp1653_update_hw(flash); |
| 202 | } |
| 203 | |
| 204 | static const struct v4l2_ctrl_ops adp1653_ctrl_ops = { |
| 205 | .g_volatile_ctrl = adp1653_get_ctrl, |
| 206 | .s_ctrl = adp1653_set_ctrl, |
| 207 | }; |
| 208 | |
| 209 | static int adp1653_init_controls(struct adp1653_flash *flash) |
| 210 | { |
| 211 | struct v4l2_ctrl *fault; |
| 212 | |
| 213 | v4l2_ctrl_handler_init(&flash->ctrls, 9); |
| 214 | |
| 215 | flash->led_mode = |
| 216 | v4l2_ctrl_new_std_menu(&flash->ctrls, &adp1653_ctrl_ops, |
| 217 | V4L2_CID_FLASH_LED_MODE, |
| 218 | V4L2_FLASH_LED_MODE_TORCH, ~0x7, 0); |
| 219 | v4l2_ctrl_new_std_menu(&flash->ctrls, &adp1653_ctrl_ops, |
| 220 | V4L2_CID_FLASH_STROBE_SOURCE, |
| 221 | V4L2_FLASH_STROBE_SOURCE_SOFTWARE, ~0x1, 0); |
| 222 | v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops, |
| 223 | V4L2_CID_FLASH_STROBE, 0, 0, 0, 0); |
| 224 | v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops, |
| 225 | V4L2_CID_FLASH_STROBE_STOP, 0, 0, 0, 0); |
| 226 | flash->flash_timeout = |
| 227 | v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops, |
| 228 | V4L2_CID_FLASH_TIMEOUT, TIMEOUT_MIN, |
| 229 | flash->platform_data->max_flash_timeout, |
| 230 | TIMEOUT_STEP, |
| 231 | flash->platform_data->max_flash_timeout); |
| 232 | flash->flash_intensity = |
| 233 | v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops, |
| 234 | V4L2_CID_FLASH_INTENSITY, |
| 235 | ADP1653_FLASH_INTENSITY_MIN, |
| 236 | flash->platform_data->max_flash_intensity, |
| 237 | 1, flash->platform_data->max_flash_intensity); |
| 238 | flash->torch_intensity = |
| 239 | v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops, |
| 240 | V4L2_CID_FLASH_TORCH_INTENSITY, |
| 241 | ADP1653_TORCH_INTENSITY_MIN, |
| 242 | flash->platform_data->max_torch_intensity, |
| 243 | ADP1653_FLASH_INTENSITY_STEP, |
| 244 | flash->platform_data->max_torch_intensity); |
| 245 | flash->indicator_intensity = |
| 246 | v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops, |
| 247 | V4L2_CID_FLASH_INDICATOR_INTENSITY, |
| 248 | ADP1653_INDICATOR_INTENSITY_MIN, |
| 249 | flash->platform_data->max_indicator_intensity, |
| 250 | ADP1653_INDICATOR_INTENSITY_STEP, |
| 251 | ADP1653_INDICATOR_INTENSITY_MIN); |
| 252 | fault = v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops, |
| 253 | V4L2_CID_FLASH_FAULT, 0, |
| 254 | V4L2_FLASH_FAULT_OVER_VOLTAGE |
| 255 | | V4L2_FLASH_FAULT_OVER_TEMPERATURE |
| 256 | | V4L2_FLASH_FAULT_SHORT_CIRCUIT, 0, 0); |
| 257 | |
| 258 | if (flash->ctrls.error) |
| 259 | return flash->ctrls.error; |
| 260 | |
| 261 | fault->is_volatile = 1; |
| 262 | |
| 263 | flash->subdev.ctrl_handler = &flash->ctrls; |
| 264 | return 0; |
| 265 | } |
| 266 | |
| 267 | /* -------------------------------------------------------------------------- |
| 268 | * V4L2 subdev operations |
| 269 | */ |
| 270 | |
| 271 | static int |
| 272 | adp1653_init_device(struct adp1653_flash *flash) |
| 273 | { |
| 274 | struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev); |
| 275 | int rval; |
| 276 | |
| 277 | /* Clear FAULT register by writing zero to OUT_SEL */ |
| 278 | rval = i2c_smbus_write_byte_data(client, ADP1653_REG_OUT_SEL, 0); |
| 279 | if (rval < 0) { |
| 280 | dev_err(&client->dev, "failed writing fault register\n"); |
| 281 | return -EIO; |
| 282 | } |
| 283 | |
| 284 | mutex_lock(&flash->ctrls.lock); |
| 285 | /* Reset faults before reading new ones. */ |
| 286 | flash->fault = 0; |
| 287 | rval = adp1653_get_fault(flash); |
| 288 | mutex_unlock(&flash->ctrls.lock); |
| 289 | if (rval > 0) { |
| 290 | dev_err(&client->dev, "faults detected: 0x%1.1x\n", rval); |
| 291 | return -EIO; |
| 292 | } |
| 293 | |
| 294 | mutex_lock(&flash->ctrls.lock); |
| 295 | rval = adp1653_update_hw(flash); |
| 296 | mutex_unlock(&flash->ctrls.lock); |
| 297 | if (rval) { |
| 298 | dev_err(&client->dev, |
| 299 | "adp1653_update_hw failed at %s\n", __func__); |
| 300 | return -EIO; |
| 301 | } |
| 302 | |
| 303 | return 0; |
| 304 | } |
| 305 | |
| 306 | static int |
| 307 | __adp1653_set_power(struct adp1653_flash *flash, int on) |
| 308 | { |
| 309 | int ret; |
| 310 | |
| 311 | ret = flash->platform_data->power(&flash->subdev, on); |
| 312 | if (ret < 0) |
| 313 | return ret; |
| 314 | |
| 315 | if (!on) |
| 316 | return 0; |
| 317 | |
| 318 | ret = adp1653_init_device(flash); |
| 319 | if (ret < 0) |
| 320 | flash->platform_data->power(&flash->subdev, 0); |
| 321 | |
| 322 | return ret; |
| 323 | } |
| 324 | |
| 325 | static int |
| 326 | adp1653_set_power(struct v4l2_subdev *subdev, int on) |
| 327 | { |
| 328 | struct adp1653_flash *flash = to_adp1653_flash(subdev); |
| 329 | int ret = 0; |
| 330 | |
| 331 | mutex_lock(&flash->power_lock); |
| 332 | |
| 333 | /* If the power count is modified from 0 to != 0 or from != 0 to 0, |
| 334 | * update the power state. |
| 335 | */ |
| 336 | if (flash->power_count == !on) { |
| 337 | ret = __adp1653_set_power(flash, !!on); |
| 338 | if (ret < 0) |
| 339 | goto done; |
| 340 | } |
| 341 | |
| 342 | /* Update the power count. */ |
| 343 | flash->power_count += on ? 1 : -1; |
| 344 | WARN_ON(flash->power_count < 0); |
| 345 | |
| 346 | done: |
| 347 | mutex_unlock(&flash->power_lock); |
| 348 | return ret; |
| 349 | } |
| 350 | |
| 351 | static int adp1653_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh) |
| 352 | { |
| 353 | return adp1653_set_power(sd, 1); |
| 354 | } |
| 355 | |
| 356 | static int adp1653_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh) |
| 357 | { |
| 358 | return adp1653_set_power(sd, 0); |
| 359 | } |
| 360 | |
| 361 | static const struct v4l2_subdev_core_ops adp1653_core_ops = { |
| 362 | .s_power = adp1653_set_power, |
| 363 | }; |
| 364 | |
| 365 | static const struct v4l2_subdev_ops adp1653_ops = { |
| 366 | .core = &adp1653_core_ops, |
| 367 | }; |
| 368 | |
| 369 | static const struct v4l2_subdev_internal_ops adp1653_internal_ops = { |
| 370 | .open = adp1653_open, |
| 371 | .close = adp1653_close, |
| 372 | }; |
| 373 | |
| 374 | /* -------------------------------------------------------------------------- |
| 375 | * I2C driver |
| 376 | */ |
| 377 | #ifdef CONFIG_PM |
| 378 | |
| 379 | static int adp1653_suspend(struct device *dev) |
| 380 | { |
| 381 | struct i2c_client *client = to_i2c_client(dev); |
| 382 | struct v4l2_subdev *subdev = i2c_get_clientdata(client); |
| 383 | struct adp1653_flash *flash = to_adp1653_flash(subdev); |
| 384 | |
| 385 | if (!flash->power_count) |
| 386 | return 0; |
| 387 | |
| 388 | return __adp1653_set_power(flash, 0); |
| 389 | } |
| 390 | |
| 391 | static int adp1653_resume(struct device *dev) |
| 392 | { |
| 393 | struct i2c_client *client = to_i2c_client(dev); |
| 394 | struct v4l2_subdev *subdev = i2c_get_clientdata(client); |
| 395 | struct adp1653_flash *flash = to_adp1653_flash(subdev); |
| 396 | |
| 397 | if (!flash->power_count) |
| 398 | return 0; |
| 399 | |
| 400 | return __adp1653_set_power(flash, 1); |
| 401 | } |
| 402 | |
| 403 | #else |
| 404 | |
| 405 | #define adp1653_suspend NULL |
| 406 | #define adp1653_resume NULL |
| 407 | |
| 408 | #endif /* CONFIG_PM */ |
| 409 | |
| 410 | static int adp1653_probe(struct i2c_client *client, |
| 411 | const struct i2c_device_id *devid) |
| 412 | { |
| 413 | struct adp1653_flash *flash; |
| 414 | int ret; |
| 415 | |
| 416 | flash = kzalloc(sizeof(*flash), GFP_KERNEL); |
| 417 | if (flash == NULL) |
| 418 | return -ENOMEM; |
| 419 | |
| 420 | flash->platform_data = client->dev.platform_data; |
| 421 | |
| 422 | mutex_init(&flash->power_lock); |
| 423 | |
| 424 | v4l2_i2c_subdev_init(&flash->subdev, client, &adp1653_ops); |
| 425 | flash->subdev.internal_ops = &adp1653_internal_ops; |
| 426 | flash->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE; |
| 427 | |
| 428 | adp1653_init_controls(flash); |
| 429 | |
| 430 | ret = media_entity_init(&flash->subdev.entity, 0, NULL, 0); |
| 431 | if (ret < 0) |
| 432 | kfree(flash); |
| 433 | |
| 434 | return ret; |
| 435 | } |
| 436 | |
| 437 | static int __exit adp1653_remove(struct i2c_client *client) |
| 438 | { |
| 439 | struct v4l2_subdev *subdev = i2c_get_clientdata(client); |
| 440 | struct adp1653_flash *flash = to_adp1653_flash(subdev); |
| 441 | |
| 442 | v4l2_device_unregister_subdev(&flash->subdev); |
| 443 | v4l2_ctrl_handler_free(&flash->ctrls); |
| 444 | media_entity_cleanup(&flash->subdev.entity); |
| 445 | kfree(flash); |
| 446 | return 0; |
| 447 | } |
| 448 | |
| 449 | static const struct i2c_device_id adp1653_id_table[] = { |
| 450 | { ADP1653_NAME, 0 }, |
| 451 | { } |
| 452 | }; |
| 453 | MODULE_DEVICE_TABLE(i2c, adp1653_id_table); |
| 454 | |
| 455 | static struct dev_pm_ops adp1653_pm_ops = { |
| 456 | .suspend = adp1653_suspend, |
| 457 | .resume = adp1653_resume, |
| 458 | }; |
| 459 | |
| 460 | static struct i2c_driver adp1653_i2c_driver = { |
| 461 | .driver = { |
| 462 | .name = ADP1653_NAME, |
| 463 | .pm = &adp1653_pm_ops, |
| 464 | }, |
| 465 | .probe = adp1653_probe, |
| 466 | .remove = __exit_p(adp1653_remove), |
| 467 | .id_table = adp1653_id_table, |
| 468 | }; |
| 469 | |
| 470 | static int __init adp1653_init(void) |
| 471 | { |
| 472 | int rval; |
| 473 | |
| 474 | rval = i2c_add_driver(&adp1653_i2c_driver); |
| 475 | if (rval) |
| 476 | printk(KERN_ALERT "%s: failed at i2c_add_driver\n", __func__); |
| 477 | |
| 478 | return rval; |
| 479 | } |
| 480 | |
| 481 | static void __exit adp1653_exit(void) |
| 482 | { |
| 483 | i2c_del_driver(&adp1653_i2c_driver); |
| 484 | } |
| 485 | |
| 486 | module_init(adp1653_init); |
| 487 | module_exit(adp1653_exit); |
| 488 | |
| 489 | MODULE_AUTHOR("Sakari Ailus <sakari.ailus@nokia.com>"); |
| 490 | MODULE_DESCRIPTION("Analog Devices ADP1653 LED flash driver"); |
| 491 | MODULE_LICENSE("GPL"); |