1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * drivers/media/i2c/adp1653.c 4 * 5 * Copyright (C) 2008--2011 Nokia Corporation 6 * 7 * Contact: Sakari Ailus <sakari.ailus@iki.fi> 8 * 9 * Contributors: 10 * Sakari Ailus <sakari.ailus@iki.fi> 11 * Tuukka Toivonen <tuukkat76@gmail.com> 12 * Pavel Machek <pavel@ucw.cz> 13 * 14 * TODO: 15 * - fault interrupt handling 16 * - hardware strobe 17 * - power doesn't need to be ON if all lights are off 18 */ 19 20 #include <linux/delay.h> 21 #include <linux/module.h> 22 #include <linux/i2c.h> 23 #include <linux/slab.h> 24 #include <linux/of.h> 25 #include <linux/gpio/consumer.h> 26 #include <media/i2c/adp1653.h> 27 #include <media/v4l2-device.h> 28 29 #define TIMEOUT_MAX 820000 30 #define TIMEOUT_STEP 54600 31 #define TIMEOUT_MIN (TIMEOUT_MAX - ADP1653_REG_CONFIG_TMR_SET_MAX \ 32 * TIMEOUT_STEP) 33 #define TIMEOUT_US_TO_CODE(t) ((TIMEOUT_MAX + (TIMEOUT_STEP / 2) - (t)) \ 34 / TIMEOUT_STEP) 35 #define TIMEOUT_CODE_TO_US(c) (TIMEOUT_MAX - (c) * TIMEOUT_STEP) 36 37 /* Write values into ADP1653 registers. */ 38 static int adp1653_update_hw(struct adp1653_flash *flash) 39 { 40 struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev); 41 u8 out_sel; 42 u8 config = 0; 43 int rval; 44 45 out_sel = ADP1653_INDICATOR_INTENSITY_uA_TO_REG( 46 flash->indicator_intensity->val) 47 << ADP1653_REG_OUT_SEL_ILED_SHIFT; 48 49 switch (flash->led_mode->val) { 50 case V4L2_FLASH_LED_MODE_NONE: 51 break; 52 case V4L2_FLASH_LED_MODE_FLASH: 53 /* Flash mode, light on with strobe, duration from timer */ 54 config = ADP1653_REG_CONFIG_TMR_CFG; 55 config |= TIMEOUT_US_TO_CODE(flash->flash_timeout->val) 56 << ADP1653_REG_CONFIG_TMR_SET_SHIFT; 57 break; 58 case V4L2_FLASH_LED_MODE_TORCH: 59 /* Torch mode, light immediately on, duration indefinite */ 60 out_sel |= ADP1653_FLASH_INTENSITY_mA_TO_REG( 61 flash->torch_intensity->val) 62 << ADP1653_REG_OUT_SEL_HPLED_SHIFT; 63 break; 64 } 65 66 rval = i2c_smbus_write_byte_data(client, ADP1653_REG_OUT_SEL, out_sel); 67 if (rval < 0) 68 return rval; 69 70 rval = i2c_smbus_write_byte_data(client, ADP1653_REG_CONFIG, config); 71 if (rval < 0) 72 return rval; 73 74 return 0; 75 } 76 77 static int adp1653_get_fault(struct adp1653_flash *flash) 78 { 79 struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev); 80 int fault; 81 int rval; 82 83 fault = i2c_smbus_read_byte_data(client, ADP1653_REG_FAULT); 84 if (fault < 0) 85 return fault; 86 87 flash->fault |= fault; 88 89 if (!flash->fault) 90 return 0; 91 92 /* Clear faults. */ 93 rval = i2c_smbus_write_byte_data(client, ADP1653_REG_OUT_SEL, 0); 94 if (rval < 0) 95 return rval; 96 97 flash->led_mode->val = V4L2_FLASH_LED_MODE_NONE; 98 99 rval = adp1653_update_hw(flash); 100 if (rval) 101 return rval; 102 103 return flash->fault; 104 } 105 106 static int adp1653_strobe(struct adp1653_flash *flash, int enable) 107 { 108 struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev); 109 u8 out_sel = ADP1653_INDICATOR_INTENSITY_uA_TO_REG( 110 flash->indicator_intensity->val) 111 << ADP1653_REG_OUT_SEL_ILED_SHIFT; 112 int rval; 113 114 if (flash->led_mode->val != V4L2_FLASH_LED_MODE_FLASH) 115 return -EBUSY; 116 117 if (!enable) 118 return i2c_smbus_write_byte_data(client, ADP1653_REG_OUT_SEL, 119 out_sel); 120 121 out_sel |= ADP1653_FLASH_INTENSITY_mA_TO_REG( 122 flash->flash_intensity->val) 123 << ADP1653_REG_OUT_SEL_HPLED_SHIFT; 124 rval = i2c_smbus_write_byte_data(client, ADP1653_REG_OUT_SEL, out_sel); 125 if (rval) 126 return rval; 127 128 /* Software strobe using i2c */ 129 rval = i2c_smbus_write_byte_data(client, ADP1653_REG_SW_STROBE, 130 ADP1653_REG_SW_STROBE_SW_STROBE); 131 if (rval) 132 return rval; 133 return i2c_smbus_write_byte_data(client, ADP1653_REG_SW_STROBE, 0); 134 } 135 136 /* -------------------------------------------------------------------------- 137 * V4L2 controls 138 */ 139 140 static int adp1653_get_ctrl(struct v4l2_ctrl *ctrl) 141 { 142 struct adp1653_flash *flash = 143 container_of(ctrl->handler, struct adp1653_flash, ctrls); 144 int rval; 145 146 rval = adp1653_get_fault(flash); 147 if (rval) 148 return rval; 149 150 ctrl->cur.val = 0; 151 152 if (flash->fault & ADP1653_REG_FAULT_FLT_SCP) 153 ctrl->cur.val |= V4L2_FLASH_FAULT_SHORT_CIRCUIT; 154 if (flash->fault & ADP1653_REG_FAULT_FLT_OT) 155 ctrl->cur.val |= V4L2_FLASH_FAULT_OVER_TEMPERATURE; 156 if (flash->fault & ADP1653_REG_FAULT_FLT_TMR) 157 ctrl->cur.val |= V4L2_FLASH_FAULT_TIMEOUT; 158 if (flash->fault & ADP1653_REG_FAULT_FLT_OV) 159 ctrl->cur.val |= V4L2_FLASH_FAULT_OVER_VOLTAGE; 160 161 flash->fault = 0; 162 163 return 0; 164 } 165 166 static int adp1653_set_ctrl(struct v4l2_ctrl *ctrl) 167 { 168 struct adp1653_flash *flash = 169 container_of(ctrl->handler, struct adp1653_flash, ctrls); 170 int rval; 171 172 rval = adp1653_get_fault(flash); 173 if (rval) 174 return rval; 175 if ((rval & (ADP1653_REG_FAULT_FLT_SCP | 176 ADP1653_REG_FAULT_FLT_OT | 177 ADP1653_REG_FAULT_FLT_OV)) && 178 (ctrl->id == V4L2_CID_FLASH_STROBE || 179 ctrl->id == V4L2_CID_FLASH_TORCH_INTENSITY || 180 ctrl->id == V4L2_CID_FLASH_LED_MODE)) 181 return -EBUSY; 182 183 switch (ctrl->id) { 184 case V4L2_CID_FLASH_STROBE: 185 return adp1653_strobe(flash, 1); 186 case V4L2_CID_FLASH_STROBE_STOP: 187 return adp1653_strobe(flash, 0); 188 } 189 190 return adp1653_update_hw(flash); 191 } 192 193 static const struct v4l2_ctrl_ops adp1653_ctrl_ops = { 194 .g_volatile_ctrl = adp1653_get_ctrl, 195 .s_ctrl = adp1653_set_ctrl, 196 }; 197 198 static int adp1653_init_controls(struct adp1653_flash *flash) 199 { 200 struct v4l2_ctrl *fault; 201 202 v4l2_ctrl_handler_init(&flash->ctrls, 9); 203 204 flash->led_mode = 205 v4l2_ctrl_new_std_menu(&flash->ctrls, &adp1653_ctrl_ops, 206 V4L2_CID_FLASH_LED_MODE, 207 V4L2_FLASH_LED_MODE_TORCH, ~0x7, 0); 208 v4l2_ctrl_new_std_menu(&flash->ctrls, &adp1653_ctrl_ops, 209 V4L2_CID_FLASH_STROBE_SOURCE, 210 V4L2_FLASH_STROBE_SOURCE_SOFTWARE, ~0x1, 0); 211 v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops, 212 V4L2_CID_FLASH_STROBE, 0, 0, 0, 0); 213 v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops, 214 V4L2_CID_FLASH_STROBE_STOP, 0, 0, 0, 0); 215 flash->flash_timeout = 216 v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops, 217 V4L2_CID_FLASH_TIMEOUT, TIMEOUT_MIN, 218 flash->platform_data->max_flash_timeout, 219 TIMEOUT_STEP, 220 flash->platform_data->max_flash_timeout); 221 flash->flash_intensity = 222 v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops, 223 V4L2_CID_FLASH_INTENSITY, 224 ADP1653_FLASH_INTENSITY_MIN, 225 flash->platform_data->max_flash_intensity, 226 1, flash->platform_data->max_flash_intensity); 227 flash->torch_intensity = 228 v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops, 229 V4L2_CID_FLASH_TORCH_INTENSITY, 230 ADP1653_TORCH_INTENSITY_MIN, 231 flash->platform_data->max_torch_intensity, 232 ADP1653_FLASH_INTENSITY_STEP, 233 flash->platform_data->max_torch_intensity); 234 flash->indicator_intensity = 235 v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops, 236 V4L2_CID_FLASH_INDICATOR_INTENSITY, 237 ADP1653_INDICATOR_INTENSITY_MIN, 238 flash->platform_data->max_indicator_intensity, 239 ADP1653_INDICATOR_INTENSITY_STEP, 240 ADP1653_INDICATOR_INTENSITY_MIN); 241 fault = v4l2_ctrl_new_std(&flash->ctrls, &adp1653_ctrl_ops, 242 V4L2_CID_FLASH_FAULT, 0, 243 V4L2_FLASH_FAULT_OVER_VOLTAGE 244 | V4L2_FLASH_FAULT_OVER_TEMPERATURE 245 | V4L2_FLASH_FAULT_SHORT_CIRCUIT, 0, 0); 246 247 if (flash->ctrls.error) 248 return flash->ctrls.error; 249 250 fault->flags |= V4L2_CTRL_FLAG_VOLATILE; 251 252 flash->subdev.ctrl_handler = &flash->ctrls; 253 return 0; 254 } 255 256 /* -------------------------------------------------------------------------- 257 * V4L2 subdev operations 258 */ 259 260 static int 261 adp1653_init_device(struct adp1653_flash *flash) 262 { 263 struct i2c_client *client = v4l2_get_subdevdata(&flash->subdev); 264 int rval; 265 266 /* Clear FAULT register by writing zero to OUT_SEL */ 267 rval = i2c_smbus_write_byte_data(client, ADP1653_REG_OUT_SEL, 0); 268 if (rval < 0) { 269 dev_err(&client->dev, "failed writing fault register\n"); 270 return -EIO; 271 } 272 273 mutex_lock(flash->ctrls.lock); 274 /* Reset faults before reading new ones. */ 275 flash->fault = 0; 276 rval = adp1653_get_fault(flash); 277 mutex_unlock(flash->ctrls.lock); 278 if (rval > 0) { 279 dev_err(&client->dev, "faults detected: 0x%1.1x\n", rval); 280 return -EIO; 281 } 282 283 mutex_lock(flash->ctrls.lock); 284 rval = adp1653_update_hw(flash); 285 mutex_unlock(flash->ctrls.lock); 286 if (rval) { 287 dev_err(&client->dev, 288 "adp1653_update_hw failed at %s\n", __func__); 289 return -EIO; 290 } 291 292 return 0; 293 } 294 295 static int 296 __adp1653_set_power(struct adp1653_flash *flash, int on) 297 { 298 int ret; 299 300 if (flash->platform_data->power) { 301 ret = flash->platform_data->power(&flash->subdev, on); 302 if (ret < 0) 303 return ret; 304 } else { 305 gpiod_set_value(flash->platform_data->enable_gpio, on); 306 if (on) 307 /* Some delay is apparently required. */ 308 udelay(20); 309 } 310 311 if (!on) 312 return 0; 313 314 ret = adp1653_init_device(flash); 315 if (ret >= 0) 316 return ret; 317 318 if (flash->platform_data->power) 319 flash->platform_data->power(&flash->subdev, 0); 320 else 321 gpiod_set_value(flash->platform_data->enable_gpio, 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 v4l2_subdev *subdev = dev_get_drvdata(dev); 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 v4l2_subdev *subdev = dev_get_drvdata(dev); 394 struct adp1653_flash *flash = to_adp1653_flash(subdev); 395 396 if (!flash->power_count) 397 return 0; 398 399 return __adp1653_set_power(flash, 1); 400 } 401 402 #else 403 404 #define adp1653_suspend NULL 405 #define adp1653_resume NULL 406 407 #endif /* CONFIG_PM */ 408 409 static int adp1653_of_init(struct i2c_client *client, 410 struct adp1653_flash *flash, 411 struct device_node *node) 412 { 413 struct adp1653_platform_data *pd; 414 struct device_node *node_indicator = NULL; 415 struct device_node *node_flash; 416 417 pd = devm_kzalloc(&client->dev, sizeof(*pd), GFP_KERNEL); 418 if (!pd) 419 return -ENOMEM; 420 flash->platform_data = pd; 421 422 node_flash = of_get_child_by_name(node, "flash"); 423 if (!node_flash) 424 return -EINVAL; 425 426 if (of_property_read_u32(node_flash, "flash-timeout-us", 427 &pd->max_flash_timeout)) 428 goto err; 429 430 if (of_property_read_u32(node_flash, "flash-max-microamp", 431 &pd->max_flash_intensity)) 432 goto err; 433 434 pd->max_flash_intensity /= 1000; 435 436 if (of_property_read_u32(node_flash, "led-max-microamp", 437 &pd->max_torch_intensity)) 438 goto err; 439 440 pd->max_torch_intensity /= 1000; 441 442 node_indicator = of_get_child_by_name(node, "indicator"); 443 if (!node_indicator) 444 goto err; 445 446 if (of_property_read_u32(node_indicator, "led-max-microamp", 447 &pd->max_indicator_intensity)) 448 goto err; 449 450 of_node_put(node_flash); 451 of_node_put(node_indicator); 452 453 pd->enable_gpio = devm_gpiod_get(&client->dev, "enable", GPIOD_OUT_LOW); 454 if (IS_ERR(pd->enable_gpio)) { 455 dev_err(&client->dev, "Error getting GPIO\n"); 456 return PTR_ERR(pd->enable_gpio); 457 } 458 459 return 0; 460 err: 461 dev_err(&client->dev, "Required property not found\n"); 462 of_node_put(node_flash); 463 of_node_put(node_indicator); 464 return -EINVAL; 465 } 466 467 468 static int adp1653_probe(struct i2c_client *client) 469 { 470 struct adp1653_flash *flash; 471 int ret; 472 473 flash = devm_kzalloc(&client->dev, sizeof(*flash), GFP_KERNEL); 474 if (flash == NULL) 475 return -ENOMEM; 476 477 if (client->dev.of_node) { 478 ret = adp1653_of_init(client, flash, client->dev.of_node); 479 if (ret) 480 return ret; 481 } else { 482 if (!client->dev.platform_data) { 483 dev_err(&client->dev, 484 "Neither DT not platform data provided\n"); 485 return -EINVAL; 486 } 487 flash->platform_data = client->dev.platform_data; 488 } 489 490 mutex_init(&flash->power_lock); 491 492 v4l2_i2c_subdev_init(&flash->subdev, client, &adp1653_ops); 493 flash->subdev.internal_ops = &adp1653_internal_ops; 494 flash->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE; 495 496 ret = adp1653_init_controls(flash); 497 if (ret) 498 goto free_and_quit; 499 500 ret = media_entity_pads_init(&flash->subdev.entity, 0, NULL); 501 if (ret < 0) 502 goto free_and_quit; 503 504 flash->subdev.entity.function = MEDIA_ENT_F_FLASH; 505 506 return 0; 507 508 free_and_quit: 509 dev_err(&client->dev, "adp1653: failed to register device\n"); 510 v4l2_ctrl_handler_free(&flash->ctrls); 511 return ret; 512 } 513 514 static void adp1653_remove(struct i2c_client *client) 515 { 516 struct v4l2_subdev *subdev = i2c_get_clientdata(client); 517 struct adp1653_flash *flash = to_adp1653_flash(subdev); 518 519 v4l2_device_unregister_subdev(&flash->subdev); 520 v4l2_ctrl_handler_free(&flash->ctrls); 521 media_entity_cleanup(&flash->subdev.entity); 522 } 523 524 static const struct i2c_device_id adp1653_id_table[] = { 525 { ADP1653_NAME, 0 }, 526 { } 527 }; 528 MODULE_DEVICE_TABLE(i2c, adp1653_id_table); 529 530 static const struct dev_pm_ops adp1653_pm_ops = { 531 .suspend = adp1653_suspend, 532 .resume = adp1653_resume, 533 }; 534 535 static struct i2c_driver adp1653_i2c_driver = { 536 .driver = { 537 .name = ADP1653_NAME, 538 .pm = &adp1653_pm_ops, 539 }, 540 .probe = adp1653_probe, 541 .remove = adp1653_remove, 542 .id_table = adp1653_id_table, 543 }; 544 545 module_i2c_driver(adp1653_i2c_driver); 546 547 MODULE_AUTHOR("Sakari Ailus <sakari.ailus@nokia.com>"); 548 MODULE_DESCRIPTION("Analog Devices ADP1653 LED flash driver"); 549 MODULE_LICENSE("GPL"); 550