1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * These are the two Sharp GP2AP002 variants supported by this driver: 4 * GP2AP002A00F Ambient Light and Proximity Sensor 5 * GP2AP002S00F Proximity Sensor 6 * 7 * Copyright (C) 2020 Linaro Ltd. 8 * Author: Linus Walleij <linus.walleij@linaro.org> 9 * 10 * Based partly on the code in Sony Ericssons GP2AP00200F driver by 11 * Courtney Cavin and Oskar Andero in drivers/input/misc/gp2ap002a00f.c 12 * Based partly on a Samsung misc driver submitted by 13 * Donggeun Kim & Minkyu Kang in 2011: 14 * https://lore.kernel.org/lkml/1315556546-7445-1-git-send-email-dg77.kim@samsung.com/ 15 * Based partly on a submission by 16 * Jonathan Bakker and Paweł Chmiel in january 2019: 17 * https://lore.kernel.org/linux-input/20190125175045.22576-1-pawel.mikolaj.chmiel@gmail.com/ 18 * Based partly on code from the Samsung GT-S7710 by <mjchen@sta.samsung.com> 19 * Based partly on the code in LG Electronics GP2AP00200F driver by 20 * Kenobi Lee <sungyoung.lee@lge.com> and EunYoung Cho <ey.cho@lge.com> 21 */ 22 #include <linux/module.h> 23 #include <linux/i2c.h> 24 #include <linux/regmap.h> 25 #include <linux/iio/iio.h> 26 #include <linux/iio/sysfs.h> 27 #include <linux/iio/events.h> 28 #include <linux/iio/consumer.h> /* To get our ADC channel */ 29 #include <linux/iio/types.h> /* To deal with our ADC channel */ 30 #include <linux/init.h> 31 #include <linux/delay.h> 32 #include <linux/regulator/consumer.h> 33 #include <linux/pm_runtime.h> 34 #include <linux/interrupt.h> 35 #include <linux/bits.h> 36 #include <linux/math64.h> 37 #include <linux/pm.h> 38 39 #define GP2AP002_PROX_CHANNEL 0 40 #define GP2AP002_ALS_CHANNEL 1 41 42 /* ------------------------------------------------------------------------ */ 43 /* ADDRESS SYMBOL DATA Init R/W */ 44 /* D7 D6 D5 D4 D3 D2 D1 D0 */ 45 /* ------------------------------------------------------------------------ */ 46 /* 0 PROX X X X X X X X VO H'00 R */ 47 /* 1 GAIN X X X X LED0 X X X H'00 W */ 48 /* 2 HYS HYSD HYSC1 HYSC0 X HYSF3 HYSF2 HYSF1 HYSF0 H'00 W */ 49 /* 3 CYCLE X X CYCL2 CYCL1 CYCL0 OSC2 X X H'00 W */ 50 /* 4 OPMOD X X X ASD X X VCON SSD H'00 W */ 51 /* 6 CON X X X OCON1 OCON0 X X X H'00 W */ 52 /* ------------------------------------------------------------------------ */ 53 /* VO :Proximity sensing result(0: no detection, 1: detection) */ 54 /* LED0 :Select switch for LED driver's On-registence(0:2x higher, 1:normal)*/ 55 /* HYSD/HYSF :Adjusts the receiver sensitivity */ 56 /* OSC :Select switch internal clocl frequency hoppling(0:effective) */ 57 /* CYCL :Determine the detection cycle(typically 8ms, up to 128x) */ 58 /* SSD :Software Shutdown function(0:shutdown, 1:operating) */ 59 /* VCON :VOUT output method control(0:normal, 1:interrupt) */ 60 /* ASD :Select switch for analog sleep function(0:ineffective, 1:effective)*/ 61 /* OCON :Select switch for enabling/disabling VOUT (00:enable, 11:disable) */ 62 63 #define GP2AP002_PROX 0x00 64 #define GP2AP002_GAIN 0x01 65 #define GP2AP002_HYS 0x02 66 #define GP2AP002_CYCLE 0x03 67 #define GP2AP002_OPMOD 0x04 68 #define GP2AP002_CON 0x06 69 70 #define GP2AP002_PROX_VO_DETECT BIT(0) 71 72 /* Setting this bit to 0 means 2x higher LED resistance */ 73 #define GP2AP002_GAIN_LED_NORMAL BIT(3) 74 75 /* 76 * These bits adjusts the proximity sensitivity, determining characteristics 77 * of the detection distance and its hysteresis. 78 */ 79 #define GP2AP002_HYS_HYSD_SHIFT 7 80 #define GP2AP002_HYS_HYSD_MASK BIT(7) 81 #define GP2AP002_HYS_HYSC_SHIFT 5 82 #define GP2AP002_HYS_HYSC_MASK GENMASK(6, 5) 83 #define GP2AP002_HYS_HYSF_SHIFT 0 84 #define GP2AP002_HYS_HYSF_MASK GENMASK(3, 0) 85 #define GP2AP002_HYS_MASK (GP2AP002_HYS_HYSD_MASK | \ 86 GP2AP002_HYS_HYSC_MASK | \ 87 GP2AP002_HYS_HYSF_MASK) 88 89 /* 90 * These values determine the detection cycle response time 91 * 0: 8ms, 1: 16ms, 2: 32ms, 3: 64ms, 4: 128ms, 92 * 5: 256ms, 6: 512ms, 7: 1024ms 93 */ 94 #define GP2AP002_CYCLE_CYCL_SHIFT 3 95 #define GP2AP002_CYCLE_CYCL_MASK GENMASK(5, 3) 96 97 /* 98 * Select switch for internal clock frequency hopping 99 * 0: effective, 100 * 1: ineffective 101 */ 102 #define GP2AP002_CYCLE_OSC_EFFECTIVE 0 103 #define GP2AP002_CYCLE_OSC_INEFFECTIVE BIT(2) 104 #define GP2AP002_CYCLE_OSC_MASK BIT(2) 105 106 /* Analog sleep effective */ 107 #define GP2AP002_OPMOD_ASD BIT(4) 108 /* Enable chip */ 109 #define GP2AP002_OPMOD_SSD_OPERATING BIT(0) 110 /* IRQ mode */ 111 #define GP2AP002_OPMOD_VCON_IRQ BIT(1) 112 #define GP2AP002_OPMOD_MASK (BIT(0) | BIT(1) | BIT(4)) 113 114 /* 115 * Select switch for enabling/disabling Vout pin 116 * 0: enable 117 * 2: force to go Low 118 * 3: force to go High 119 */ 120 #define GP2AP002_CON_OCON_SHIFT 3 121 #define GP2AP002_CON_OCON_ENABLE (0x0 << GP2AP002_CON_OCON_SHIFT) 122 #define GP2AP002_CON_OCON_LOW (0x2 << GP2AP002_CON_OCON_SHIFT) 123 #define GP2AP002_CON_OCON_HIGH (0x3 << GP2AP002_CON_OCON_SHIFT) 124 #define GP2AP002_CON_OCON_MASK (0x3 << GP2AP002_CON_OCON_SHIFT) 125 126 /** 127 * struct gp2ap002 - GP2AP002 state 128 * @map: regmap pointer for the i2c regmap 129 * @dev: pointer to parent device 130 * @vdd: regulator controlling VDD 131 * @vio: regulator controlling VIO 132 * @alsout: IIO ADC channel to convert the ALSOUT signal 133 * @hys_far: hysteresis control from device tree 134 * @hys_close: hysteresis control from device tree 135 * @is_gp2ap002s00f: this is the GP2AP002F variant of the chip 136 * @irq: the IRQ line used by this device 137 * @enabled: we cannot read the status of the hardware so we need to 138 * keep track of whether the event is enabled using this state variable 139 */ 140 struct gp2ap002 { 141 struct regmap *map; 142 struct device *dev; 143 struct regulator *vdd; 144 struct regulator *vio; 145 struct iio_channel *alsout; 146 u8 hys_far; 147 u8 hys_close; 148 bool is_gp2ap002s00f; 149 int irq; 150 bool enabled; 151 }; 152 153 static irqreturn_t gp2ap002_prox_irq(int irq, void *d) 154 { 155 struct iio_dev *indio_dev = d; 156 struct gp2ap002 *gp2ap002 = iio_priv(indio_dev); 157 u64 ev; 158 int val; 159 int ret; 160 161 if (!gp2ap002->enabled) 162 goto err_retrig; 163 164 ret = regmap_read(gp2ap002->map, GP2AP002_PROX, &val); 165 if (ret) { 166 dev_err(gp2ap002->dev, "error reading proximity\n"); 167 goto err_retrig; 168 } 169 170 if (val & GP2AP002_PROX_VO_DETECT) { 171 /* Close */ 172 dev_dbg(gp2ap002->dev, "close\n"); 173 ret = regmap_write(gp2ap002->map, GP2AP002_HYS, 174 gp2ap002->hys_far); 175 if (ret) 176 dev_err(gp2ap002->dev, 177 "error setting up proximity hysteresis\n"); 178 ev = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, GP2AP002_PROX_CHANNEL, 179 IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING); 180 } else { 181 /* Far */ 182 dev_dbg(gp2ap002->dev, "far\n"); 183 ret = regmap_write(gp2ap002->map, GP2AP002_HYS, 184 gp2ap002->hys_close); 185 if (ret) 186 dev_err(gp2ap002->dev, 187 "error setting up proximity hysteresis\n"); 188 ev = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, GP2AP002_PROX_CHANNEL, 189 IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING); 190 } 191 iio_push_event(indio_dev, ev, iio_get_time_ns(indio_dev)); 192 193 /* 194 * After changing hysteresis, we need to wait for one detection 195 * cycle to see if anything changed, or we will just trigger the 196 * previous interrupt again. A detection cycle depends on the CYCLE 197 * register, we are hard-coding ~8 ms in probe() so wait some more 198 * than this, 20-30 ms. 199 */ 200 usleep_range(20000, 30000); 201 202 err_retrig: 203 ret = regmap_write(gp2ap002->map, GP2AP002_CON, 204 GP2AP002_CON_OCON_ENABLE); 205 if (ret) 206 dev_err(gp2ap002->dev, "error setting up VOUT control\n"); 207 208 return IRQ_HANDLED; 209 } 210 211 /* 212 * This array maps current and lux. 213 * 214 * Ambient light sensing range is 3 to 55000 lux. 215 * 216 * This mapping is based on the following formula. 217 * illuminance = 10 ^ (current[mA] / 10) 218 * 219 * When the ADC measures 0, return 0 lux. 220 */ 221 static const u16 gp2ap002_illuminance_table[] = { 222 0, 1, 1, 2, 2, 3, 4, 5, 6, 8, 10, 12, 16, 20, 25, 32, 40, 50, 63, 79, 223 100, 126, 158, 200, 251, 316, 398, 501, 631, 794, 1000, 1259, 1585, 224 1995, 2512, 3162, 3981, 5012, 6310, 7943, 10000, 12589, 15849, 19953, 225 25119, 31623, 39811, 50119, 226 }; 227 228 static int gp2ap002_get_lux(struct gp2ap002 *gp2ap002) 229 { 230 int ret, res; 231 u16 lux; 232 233 ret = iio_read_channel_processed(gp2ap002->alsout, &res); 234 if (ret < 0) 235 return ret; 236 237 dev_dbg(gp2ap002->dev, "read %d mA from ADC\n", res); 238 239 /* ensure we don't under/overflow */ 240 res = clamp(res, 0, (int)ARRAY_SIZE(gp2ap002_illuminance_table) - 1); 241 lux = gp2ap002_illuminance_table[res]; 242 243 return (int)lux; 244 } 245 246 static int gp2ap002_read_raw(struct iio_dev *indio_dev, 247 struct iio_chan_spec const *chan, 248 int *val, int *val2, long mask) 249 { 250 struct gp2ap002 *gp2ap002 = iio_priv(indio_dev); 251 int ret; 252 253 pm_runtime_get_sync(gp2ap002->dev); 254 255 switch (mask) { 256 case IIO_CHAN_INFO_RAW: 257 switch (chan->type) { 258 case IIO_LIGHT: 259 ret = gp2ap002_get_lux(gp2ap002); 260 if (ret < 0) 261 return ret; 262 *val = ret; 263 ret = IIO_VAL_INT; 264 goto out; 265 default: 266 ret = -EINVAL; 267 goto out; 268 } 269 default: 270 ret = -EINVAL; 271 } 272 273 out: 274 pm_runtime_mark_last_busy(gp2ap002->dev); 275 pm_runtime_put_autosuspend(gp2ap002->dev); 276 277 return ret; 278 } 279 280 static int gp2ap002_init(struct gp2ap002 *gp2ap002) 281 { 282 int ret; 283 284 /* Set up the IR LED resistance */ 285 ret = regmap_write(gp2ap002->map, GP2AP002_GAIN, 286 GP2AP002_GAIN_LED_NORMAL); 287 if (ret) { 288 dev_err(gp2ap002->dev, "error setting up LED gain\n"); 289 return ret; 290 } 291 ret = regmap_write(gp2ap002->map, GP2AP002_HYS, gp2ap002->hys_far); 292 if (ret) { 293 dev_err(gp2ap002->dev, 294 "error setting up proximity hysteresis\n"); 295 return ret; 296 } 297 298 /* Disable internal frequency hopping */ 299 ret = regmap_write(gp2ap002->map, GP2AP002_CYCLE, 300 GP2AP002_CYCLE_OSC_INEFFECTIVE); 301 if (ret) { 302 dev_err(gp2ap002->dev, 303 "error setting up internal frequency hopping\n"); 304 return ret; 305 } 306 307 /* Enable chip and IRQ, disable analog sleep */ 308 ret = regmap_write(gp2ap002->map, GP2AP002_OPMOD, 309 GP2AP002_OPMOD_SSD_OPERATING | 310 GP2AP002_OPMOD_VCON_IRQ); 311 if (ret) { 312 dev_err(gp2ap002->dev, "error setting up operation mode\n"); 313 return ret; 314 } 315 316 /* Interrupt on VOUT enabled */ 317 ret = regmap_write(gp2ap002->map, GP2AP002_CON, 318 GP2AP002_CON_OCON_ENABLE); 319 if (ret) 320 dev_err(gp2ap002->dev, "error setting up VOUT control\n"); 321 322 return ret; 323 } 324 325 static int gp2ap002_read_event_config(struct iio_dev *indio_dev, 326 const struct iio_chan_spec *chan, 327 enum iio_event_type type, 328 enum iio_event_direction dir) 329 { 330 struct gp2ap002 *gp2ap002 = iio_priv(indio_dev); 331 332 /* 333 * We just keep track of this internally, as it is not possible to 334 * query the hardware. 335 */ 336 return gp2ap002->enabled; 337 } 338 339 static int gp2ap002_write_event_config(struct iio_dev *indio_dev, 340 const struct iio_chan_spec *chan, 341 enum iio_event_type type, 342 enum iio_event_direction dir, 343 int state) 344 { 345 struct gp2ap002 *gp2ap002 = iio_priv(indio_dev); 346 347 if (state) { 348 /* 349 * This will bring the regulators up (unless they are on 350 * already) and reintialize the sensor by using runtime_pm 351 * callbacks. 352 */ 353 pm_runtime_get_sync(gp2ap002->dev); 354 gp2ap002->enabled = true; 355 } else { 356 pm_runtime_mark_last_busy(gp2ap002->dev); 357 pm_runtime_put_autosuspend(gp2ap002->dev); 358 gp2ap002->enabled = false; 359 } 360 361 return 0; 362 } 363 364 static const struct iio_info gp2ap002_info = { 365 .read_raw = gp2ap002_read_raw, 366 .read_event_config = gp2ap002_read_event_config, 367 .write_event_config = gp2ap002_write_event_config, 368 }; 369 370 static const struct iio_event_spec gp2ap002_events[] = { 371 { 372 .type = IIO_EV_TYPE_THRESH, 373 .dir = IIO_EV_DIR_EITHER, 374 .mask_separate = BIT(IIO_EV_INFO_ENABLE), 375 }, 376 }; 377 378 static const struct iio_chan_spec gp2ap002_channels[] = { 379 { 380 .type = IIO_PROXIMITY, 381 .event_spec = gp2ap002_events, 382 .num_event_specs = ARRAY_SIZE(gp2ap002_events), 383 }, 384 { 385 .type = IIO_LIGHT, 386 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), 387 .channel = GP2AP002_ALS_CHANNEL, 388 }, 389 }; 390 391 /* 392 * We need a special regmap because this hardware expects to 393 * write single bytes to registers but read a 16bit word on some 394 * variants and discard the lower 8 bits so combine 395 * i2c_smbus_read_word_data() with i2c_smbus_write_byte_data() 396 * selectively like this. 397 */ 398 static int gp2ap002_regmap_i2c_read(void *context, unsigned int reg, 399 unsigned int *val) 400 { 401 struct device *dev = context; 402 struct i2c_client *i2c = to_i2c_client(dev); 403 int ret; 404 405 ret = i2c_smbus_read_word_data(i2c, reg); 406 if (ret < 0) 407 return ret; 408 409 *val = (ret >> 8) & 0xFF; 410 411 return 0; 412 } 413 414 static int gp2ap002_regmap_i2c_write(void *context, unsigned int reg, 415 unsigned int val) 416 { 417 struct device *dev = context; 418 struct i2c_client *i2c = to_i2c_client(dev); 419 420 return i2c_smbus_write_byte_data(i2c, reg, val); 421 } 422 423 static struct regmap_bus gp2ap002_regmap_bus = { 424 .reg_read = gp2ap002_regmap_i2c_read, 425 .reg_write = gp2ap002_regmap_i2c_write, 426 }; 427 428 static int gp2ap002_probe(struct i2c_client *client, 429 const struct i2c_device_id *id) 430 { 431 struct gp2ap002 *gp2ap002; 432 struct iio_dev *indio_dev; 433 struct device *dev = &client->dev; 434 enum iio_chan_type ch_type; 435 static const struct regmap_config config = { 436 .reg_bits = 8, 437 .val_bits = 8, 438 .max_register = GP2AP002_CON, 439 }; 440 struct regmap *regmap; 441 int num_chan; 442 const char *compat; 443 u8 val; 444 int ret; 445 446 indio_dev = devm_iio_device_alloc(dev, sizeof(*gp2ap002)); 447 if (!indio_dev) 448 return -ENOMEM; 449 i2c_set_clientdata(client, indio_dev); 450 451 gp2ap002 = iio_priv(indio_dev); 452 gp2ap002->dev = dev; 453 454 /* 455 * Check the device compatible like this makes it possible to use 456 * ACPI PRP0001 for registering the sensor using device tree 457 * properties. 458 */ 459 ret = device_property_read_string(dev, "compatible", &compat); 460 if (ret) { 461 dev_err(dev, "cannot check compatible\n"); 462 return ret; 463 } 464 gp2ap002->is_gp2ap002s00f = !strcmp(compat, "sharp,gp2ap002s00f"); 465 466 regmap = devm_regmap_init(dev, &gp2ap002_regmap_bus, dev, &config); 467 if (IS_ERR(regmap)) { 468 dev_err(dev, "Failed to register i2c regmap %ld\n", PTR_ERR(regmap)); 469 return PTR_ERR(regmap); 470 } 471 gp2ap002->map = regmap; 472 473 /* 474 * The hysteresis settings are coded into the device tree as values 475 * to be written into the hysteresis register. The datasheet defines 476 * modes "A", "B1" and "B2" with fixed values to be use but vendor 477 * code trees for actual devices are tweaking these values and refer to 478 * modes named things like "B1.5". To be able to support any devices, 479 * we allow passing an arbitrary hysteresis setting for "near" and 480 * "far". 481 */ 482 483 /* Check the device tree for the IR LED hysteresis */ 484 ret = device_property_read_u8(dev, "sharp,proximity-far-hysteresis", 485 &val); 486 if (ret) { 487 dev_err(dev, "failed to obtain proximity far setting\n"); 488 return ret; 489 } 490 dev_dbg(dev, "proximity far setting %02x\n", val); 491 gp2ap002->hys_far = val; 492 493 ret = device_property_read_u8(dev, "sharp,proximity-close-hysteresis", 494 &val); 495 if (ret) { 496 dev_err(dev, "failed to obtain proximity close setting\n"); 497 return ret; 498 } 499 dev_dbg(dev, "proximity close setting %02x\n", val); 500 gp2ap002->hys_close = val; 501 502 /* The GP2AP002A00F has a light sensor too */ 503 if (!gp2ap002->is_gp2ap002s00f) { 504 gp2ap002->alsout = devm_iio_channel_get(dev, "alsout"); 505 if (IS_ERR(gp2ap002->alsout)) { 506 ret = PTR_ERR(gp2ap002->alsout); 507 ret = (ret == -ENODEV) ? -EPROBE_DEFER : ret; 508 return dev_err_probe(dev, ret, "failed to get ALSOUT ADC channel\n"); 509 } 510 ret = iio_get_channel_type(gp2ap002->alsout, &ch_type); 511 if (ret < 0) 512 return ret; 513 if (ch_type != IIO_CURRENT) { 514 dev_err(dev, 515 "wrong type of IIO channel specified for ALSOUT\n"); 516 return -EINVAL; 517 } 518 } 519 520 gp2ap002->vdd = devm_regulator_get(dev, "vdd"); 521 if (IS_ERR(gp2ap002->vdd)) 522 return dev_err_probe(dev, PTR_ERR(gp2ap002->vdd), 523 "failed to get VDD regulator\n"); 524 525 gp2ap002->vio = devm_regulator_get(dev, "vio"); 526 if (IS_ERR(gp2ap002->vio)) 527 return dev_err_probe(dev, PTR_ERR(gp2ap002->vio), 528 "failed to get VIO regulator\n"); 529 530 /* Operating voltage 2.4V .. 3.6V according to datasheet */ 531 ret = regulator_set_voltage(gp2ap002->vdd, 2400000, 3600000); 532 if (ret) { 533 dev_err(dev, "failed to sett VDD voltage\n"); 534 return ret; 535 } 536 537 /* VIO should be between 1.65V and VDD */ 538 ret = regulator_get_voltage(gp2ap002->vdd); 539 if (ret < 0) { 540 dev_err(dev, "failed to get VDD voltage\n"); 541 return ret; 542 } 543 ret = regulator_set_voltage(gp2ap002->vio, 1650000, ret); 544 if (ret) { 545 dev_err(dev, "failed to set VIO voltage\n"); 546 return ret; 547 } 548 549 ret = regulator_enable(gp2ap002->vdd); 550 if (ret) { 551 dev_err(dev, "failed to enable VDD regulator\n"); 552 return ret; 553 } 554 ret = regulator_enable(gp2ap002->vio); 555 if (ret) { 556 dev_err(dev, "failed to enable VIO regulator\n"); 557 goto out_disable_vdd; 558 } 559 560 msleep(20); 561 562 /* 563 * Initialize the device and signal to runtime PM that now we are 564 * definitely up and using power. 565 */ 566 ret = gp2ap002_init(gp2ap002); 567 if (ret) { 568 dev_err(dev, "initialization failed\n"); 569 goto out_disable_vio; 570 } 571 pm_runtime_get_noresume(dev); 572 pm_runtime_set_active(dev); 573 pm_runtime_enable(dev); 574 gp2ap002->enabled = false; 575 576 ret = devm_request_threaded_irq(dev, client->irq, NULL, 577 gp2ap002_prox_irq, IRQF_ONESHOT, 578 "gp2ap002", indio_dev); 579 if (ret) { 580 dev_err(dev, "unable to request IRQ\n"); 581 goto out_put_pm; 582 } 583 gp2ap002->irq = client->irq; 584 585 /* 586 * As the device takes 20 ms + regulator delay to come up with a fresh 587 * measurement after power-on, do not shut it down unnecessarily. 588 * Set autosuspend to a one second. 589 */ 590 pm_runtime_set_autosuspend_delay(dev, 1000); 591 pm_runtime_use_autosuspend(dev); 592 pm_runtime_put(dev); 593 594 indio_dev->info = &gp2ap002_info; 595 indio_dev->name = "gp2ap002"; 596 indio_dev->channels = gp2ap002_channels; 597 /* Skip light channel for the proximity-only sensor */ 598 num_chan = ARRAY_SIZE(gp2ap002_channels); 599 if (gp2ap002->is_gp2ap002s00f) 600 num_chan--; 601 indio_dev->num_channels = num_chan; 602 indio_dev->modes = INDIO_DIRECT_MODE; 603 604 ret = iio_device_register(indio_dev); 605 if (ret) 606 goto out_disable_pm; 607 dev_dbg(dev, "Sharp GP2AP002 probed successfully\n"); 608 609 return 0; 610 611 out_put_pm: 612 pm_runtime_put_noidle(dev); 613 out_disable_pm: 614 pm_runtime_disable(dev); 615 out_disable_vio: 616 regulator_disable(gp2ap002->vio); 617 out_disable_vdd: 618 regulator_disable(gp2ap002->vdd); 619 return ret; 620 } 621 622 static void gp2ap002_remove(struct i2c_client *client) 623 { 624 struct iio_dev *indio_dev = i2c_get_clientdata(client); 625 struct gp2ap002 *gp2ap002 = iio_priv(indio_dev); 626 struct device *dev = &client->dev; 627 628 pm_runtime_get_sync(dev); 629 pm_runtime_put_noidle(dev); 630 pm_runtime_disable(dev); 631 iio_device_unregister(indio_dev); 632 regulator_disable(gp2ap002->vio); 633 regulator_disable(gp2ap002->vdd); 634 } 635 636 static int gp2ap002_runtime_suspend(struct device *dev) 637 { 638 struct iio_dev *indio_dev = dev_get_drvdata(dev); 639 struct gp2ap002 *gp2ap002 = iio_priv(indio_dev); 640 int ret; 641 642 /* Deactivate the IRQ */ 643 disable_irq(gp2ap002->irq); 644 645 /* Disable chip and IRQ, everything off */ 646 ret = regmap_write(gp2ap002->map, GP2AP002_OPMOD, 0x00); 647 if (ret) { 648 dev_err(gp2ap002->dev, "error setting up operation mode\n"); 649 return ret; 650 } 651 /* 652 * As these regulators may be shared, at least we are now in 653 * sleep even if the regulators aren't really turned off. 654 */ 655 regulator_disable(gp2ap002->vio); 656 regulator_disable(gp2ap002->vdd); 657 658 return 0; 659 } 660 661 static int gp2ap002_runtime_resume(struct device *dev) 662 { 663 struct iio_dev *indio_dev = dev_get_drvdata(dev); 664 struct gp2ap002 *gp2ap002 = iio_priv(indio_dev); 665 int ret; 666 667 ret = regulator_enable(gp2ap002->vdd); 668 if (ret) { 669 dev_err(dev, "failed to enable VDD regulator in resume path\n"); 670 return ret; 671 } 672 ret = regulator_enable(gp2ap002->vio); 673 if (ret) { 674 dev_err(dev, "failed to enable VIO regulator in resume path\n"); 675 return ret; 676 } 677 678 msleep(20); 679 680 ret = gp2ap002_init(gp2ap002); 681 if (ret) { 682 dev_err(dev, "re-initialization failed\n"); 683 return ret; 684 } 685 686 /* Re-activate the IRQ */ 687 enable_irq(gp2ap002->irq); 688 689 return 0; 690 } 691 692 static DEFINE_RUNTIME_DEV_PM_OPS(gp2ap002_dev_pm_ops, gp2ap002_runtime_suspend, 693 gp2ap002_runtime_resume, NULL); 694 695 static const struct i2c_device_id gp2ap002_id_table[] = { 696 { "gp2ap002", 0 }, 697 { }, 698 }; 699 MODULE_DEVICE_TABLE(i2c, gp2ap002_id_table); 700 701 static const struct of_device_id gp2ap002_of_match[] = { 702 { .compatible = "sharp,gp2ap002a00f" }, 703 { .compatible = "sharp,gp2ap002s00f" }, 704 { }, 705 }; 706 MODULE_DEVICE_TABLE(of, gp2ap002_of_match); 707 708 static struct i2c_driver gp2ap002_driver = { 709 .driver = { 710 .name = "gp2ap002", 711 .of_match_table = gp2ap002_of_match, 712 .pm = pm_ptr(&gp2ap002_dev_pm_ops), 713 }, 714 .probe = gp2ap002_probe, 715 .remove = gp2ap002_remove, 716 .id_table = gp2ap002_id_table, 717 }; 718 module_i2c_driver(gp2ap002_driver); 719 720 MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>"); 721 MODULE_DESCRIPTION("GP2AP002 ambient light and proximity sensor driver"); 722 MODULE_LICENSE("GPL v2"); 723