1 // SPDX-License-Identifier: GPL-2.0 2 /* ADC driver for sunxi platforms' (A10, A13 and A31) GPADC 3 * 4 * Copyright (c) 2016 Quentin Schulz <quentin.schulz@free-electrons.com> 5 * 6 * The Allwinner SoCs all have an ADC that can also act as a touchscreen 7 * controller and a thermal sensor. 8 * The thermal sensor works only when the ADC acts as a touchscreen controller 9 * and is configured to throw an interrupt every fixed periods of time (let say 10 * every X seconds). 11 * One would be tempted to disable the IP on the hardware side rather than 12 * disabling interrupts to save some power but that resets the internal clock of 13 * the IP, resulting in having to wait X seconds every time we want to read the 14 * value of the thermal sensor. 15 * This is also the reason of using autosuspend in pm_runtime. If there was no 16 * autosuspend, the thermal sensor would need X seconds after every 17 * pm_runtime_get_sync to get a value from the ADC. The autosuspend allows the 18 * thermal sensor to be requested again in a certain time span before it gets 19 * shutdown for not being used. 20 */ 21 22 #include <linux/completion.h> 23 #include <linux/interrupt.h> 24 #include <linux/io.h> 25 #include <linux/module.h> 26 #include <linux/of.h> 27 #include <linux/of_device.h> 28 #include <linux/platform_device.h> 29 #include <linux/pm_runtime.h> 30 #include <linux/regmap.h> 31 #include <linux/thermal.h> 32 #include <linux/delay.h> 33 34 #include <linux/iio/iio.h> 35 #include <linux/iio/driver.h> 36 #include <linux/iio/machine.h> 37 #include <linux/mfd/sun4i-gpadc.h> 38 39 static unsigned int sun4i_gpadc_chan_select(unsigned int chan) 40 { 41 return SUN4I_GPADC_CTRL1_ADC_CHAN_SELECT(chan); 42 } 43 44 static unsigned int sun6i_gpadc_chan_select(unsigned int chan) 45 { 46 return SUN6I_GPADC_CTRL1_ADC_CHAN_SELECT(chan); 47 } 48 49 struct gpadc_data { 50 int temp_offset; 51 int temp_scale; 52 unsigned int tp_mode_en; 53 unsigned int tp_adc_select; 54 unsigned int (*adc_chan_select)(unsigned int chan); 55 unsigned int adc_chan_mask; 56 }; 57 58 static const struct gpadc_data sun4i_gpadc_data = { 59 .temp_offset = -1932, 60 .temp_scale = 133, 61 .tp_mode_en = SUN4I_GPADC_CTRL1_TP_MODE_EN, 62 .tp_adc_select = SUN4I_GPADC_CTRL1_TP_ADC_SELECT, 63 .adc_chan_select = &sun4i_gpadc_chan_select, 64 .adc_chan_mask = SUN4I_GPADC_CTRL1_ADC_CHAN_MASK, 65 }; 66 67 static const struct gpadc_data sun5i_gpadc_data = { 68 .temp_offset = -1447, 69 .temp_scale = 100, 70 .tp_mode_en = SUN4I_GPADC_CTRL1_TP_MODE_EN, 71 .tp_adc_select = SUN4I_GPADC_CTRL1_TP_ADC_SELECT, 72 .adc_chan_select = &sun4i_gpadc_chan_select, 73 .adc_chan_mask = SUN4I_GPADC_CTRL1_ADC_CHAN_MASK, 74 }; 75 76 static const struct gpadc_data sun6i_gpadc_data = { 77 .temp_offset = -1623, 78 .temp_scale = 167, 79 .tp_mode_en = SUN6I_GPADC_CTRL1_TP_MODE_EN, 80 .tp_adc_select = SUN6I_GPADC_CTRL1_TP_ADC_SELECT, 81 .adc_chan_select = &sun6i_gpadc_chan_select, 82 .adc_chan_mask = SUN6I_GPADC_CTRL1_ADC_CHAN_MASK, 83 }; 84 85 static const struct gpadc_data sun8i_a33_gpadc_data = { 86 .temp_offset = -1662, 87 .temp_scale = 162, 88 .tp_mode_en = SUN8I_GPADC_CTRL1_CHOP_TEMP_EN, 89 }; 90 91 struct sun4i_gpadc_iio { 92 struct iio_dev *indio_dev; 93 struct completion completion; 94 int temp_data; 95 u32 adc_data; 96 struct regmap *regmap; 97 unsigned int fifo_data_irq; 98 atomic_t ignore_fifo_data_irq; 99 unsigned int temp_data_irq; 100 atomic_t ignore_temp_data_irq; 101 const struct gpadc_data *data; 102 bool no_irq; 103 /* prevents concurrent reads of temperature and ADC */ 104 struct mutex mutex; 105 struct thermal_zone_device *tzd; 106 struct device *sensor_device; 107 }; 108 109 #define SUN4I_GPADC_ADC_CHANNEL(_channel, _name) { \ 110 .type = IIO_VOLTAGE, \ 111 .indexed = 1, \ 112 .channel = _channel, \ 113 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ 114 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ 115 .datasheet_name = _name, \ 116 } 117 118 static struct iio_map sun4i_gpadc_hwmon_maps[] = { 119 { 120 .adc_channel_label = "temp_adc", 121 .consumer_dev_name = "iio_hwmon.0", 122 }, 123 { /* sentinel */ }, 124 }; 125 126 static const struct iio_chan_spec sun4i_gpadc_channels[] = { 127 SUN4I_GPADC_ADC_CHANNEL(0, "adc_chan0"), 128 SUN4I_GPADC_ADC_CHANNEL(1, "adc_chan1"), 129 SUN4I_GPADC_ADC_CHANNEL(2, "adc_chan2"), 130 SUN4I_GPADC_ADC_CHANNEL(3, "adc_chan3"), 131 { 132 .type = IIO_TEMP, 133 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | 134 BIT(IIO_CHAN_INFO_SCALE) | 135 BIT(IIO_CHAN_INFO_OFFSET), 136 .datasheet_name = "temp_adc", 137 }, 138 }; 139 140 static const struct iio_chan_spec sun4i_gpadc_channels_no_temp[] = { 141 SUN4I_GPADC_ADC_CHANNEL(0, "adc_chan0"), 142 SUN4I_GPADC_ADC_CHANNEL(1, "adc_chan1"), 143 SUN4I_GPADC_ADC_CHANNEL(2, "adc_chan2"), 144 SUN4I_GPADC_ADC_CHANNEL(3, "adc_chan3"), 145 }; 146 147 static const struct iio_chan_spec sun8i_a33_gpadc_channels[] = { 148 { 149 .type = IIO_TEMP, 150 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | 151 BIT(IIO_CHAN_INFO_SCALE) | 152 BIT(IIO_CHAN_INFO_OFFSET), 153 .datasheet_name = "temp_adc", 154 }, 155 }; 156 157 static const struct regmap_config sun4i_gpadc_regmap_config = { 158 .reg_bits = 32, 159 .val_bits = 32, 160 .reg_stride = 4, 161 .fast_io = true, 162 }; 163 164 static int sun4i_prepare_for_irq(struct iio_dev *indio_dev, int channel, 165 unsigned int irq) 166 { 167 struct sun4i_gpadc_iio *info = iio_priv(indio_dev); 168 int ret; 169 u32 reg; 170 171 pm_runtime_get_sync(indio_dev->dev.parent); 172 173 reinit_completion(&info->completion); 174 175 ret = regmap_write(info->regmap, SUN4I_GPADC_INT_FIFOC, 176 SUN4I_GPADC_INT_FIFOC_TP_FIFO_TRIG_LEVEL(1) | 177 SUN4I_GPADC_INT_FIFOC_TP_FIFO_FLUSH); 178 if (ret) 179 return ret; 180 181 ret = regmap_read(info->regmap, SUN4I_GPADC_CTRL1, ®); 182 if (ret) 183 return ret; 184 185 if (irq == info->fifo_data_irq) { 186 ret = regmap_write(info->regmap, SUN4I_GPADC_CTRL1, 187 info->data->tp_mode_en | 188 info->data->tp_adc_select | 189 info->data->adc_chan_select(channel)); 190 /* 191 * When the IP changes channel, it needs a bit of time to get 192 * correct values. 193 */ 194 if ((reg & info->data->adc_chan_mask) != 195 info->data->adc_chan_select(channel)) 196 mdelay(10); 197 198 } else { 199 /* 200 * The temperature sensor returns valid data only when the ADC 201 * operates in touchscreen mode. 202 */ 203 ret = regmap_write(info->regmap, SUN4I_GPADC_CTRL1, 204 info->data->tp_mode_en); 205 } 206 207 if (ret) 208 return ret; 209 210 /* 211 * When the IP changes mode between ADC or touchscreen, it 212 * needs a bit of time to get correct values. 213 */ 214 if ((reg & info->data->tp_adc_select) != info->data->tp_adc_select) 215 mdelay(100); 216 217 return 0; 218 } 219 220 static int sun4i_gpadc_read(struct iio_dev *indio_dev, int channel, int *val, 221 unsigned int irq) 222 { 223 struct sun4i_gpadc_iio *info = iio_priv(indio_dev); 224 int ret; 225 226 mutex_lock(&info->mutex); 227 228 ret = sun4i_prepare_for_irq(indio_dev, channel, irq); 229 if (ret) 230 goto err; 231 232 enable_irq(irq); 233 234 /* 235 * The temperature sensor throws an interruption periodically (currently 236 * set at periods of ~0.6s in sun4i_gpadc_runtime_resume). A 1s delay 237 * makes sure an interruption occurs in normal conditions. If it doesn't 238 * occur, then there is a timeout. 239 */ 240 if (!wait_for_completion_timeout(&info->completion, 241 msecs_to_jiffies(1000))) { 242 ret = -ETIMEDOUT; 243 goto err; 244 } 245 246 if (irq == info->fifo_data_irq) 247 *val = info->adc_data; 248 else 249 *val = info->temp_data; 250 251 ret = 0; 252 pm_runtime_mark_last_busy(indio_dev->dev.parent); 253 254 err: 255 pm_runtime_put_autosuspend(indio_dev->dev.parent); 256 disable_irq(irq); 257 mutex_unlock(&info->mutex); 258 259 return ret; 260 } 261 262 static int sun4i_gpadc_adc_read(struct iio_dev *indio_dev, int channel, 263 int *val) 264 { 265 struct sun4i_gpadc_iio *info = iio_priv(indio_dev); 266 267 return sun4i_gpadc_read(indio_dev, channel, val, info->fifo_data_irq); 268 } 269 270 static int sun4i_gpadc_temp_read(struct iio_dev *indio_dev, int *val) 271 { 272 struct sun4i_gpadc_iio *info = iio_priv(indio_dev); 273 274 if (info->no_irq) { 275 pm_runtime_get_sync(indio_dev->dev.parent); 276 277 regmap_read(info->regmap, SUN4I_GPADC_TEMP_DATA, val); 278 279 pm_runtime_mark_last_busy(indio_dev->dev.parent); 280 pm_runtime_put_autosuspend(indio_dev->dev.parent); 281 282 return 0; 283 } 284 285 return sun4i_gpadc_read(indio_dev, 0, val, info->temp_data_irq); 286 } 287 288 static int sun4i_gpadc_temp_offset(struct iio_dev *indio_dev, int *val) 289 { 290 struct sun4i_gpadc_iio *info = iio_priv(indio_dev); 291 292 *val = info->data->temp_offset; 293 294 return 0; 295 } 296 297 static int sun4i_gpadc_temp_scale(struct iio_dev *indio_dev, int *val) 298 { 299 struct sun4i_gpadc_iio *info = iio_priv(indio_dev); 300 301 *val = info->data->temp_scale; 302 303 return 0; 304 } 305 306 static int sun4i_gpadc_read_raw(struct iio_dev *indio_dev, 307 struct iio_chan_spec const *chan, int *val, 308 int *val2, long mask) 309 { 310 int ret; 311 312 switch (mask) { 313 case IIO_CHAN_INFO_OFFSET: 314 ret = sun4i_gpadc_temp_offset(indio_dev, val); 315 if (ret) 316 return ret; 317 318 return IIO_VAL_INT; 319 case IIO_CHAN_INFO_RAW: 320 if (chan->type == IIO_VOLTAGE) 321 ret = sun4i_gpadc_adc_read(indio_dev, chan->channel, 322 val); 323 else 324 ret = sun4i_gpadc_temp_read(indio_dev, val); 325 326 if (ret) 327 return ret; 328 329 return IIO_VAL_INT; 330 case IIO_CHAN_INFO_SCALE: 331 if (chan->type == IIO_VOLTAGE) { 332 /* 3000mV / 4096 * raw */ 333 *val = 0; 334 *val2 = 732421875; 335 return IIO_VAL_INT_PLUS_NANO; 336 } 337 338 ret = sun4i_gpadc_temp_scale(indio_dev, val); 339 if (ret) 340 return ret; 341 342 return IIO_VAL_INT; 343 default: 344 return -EINVAL; 345 } 346 347 return -EINVAL; 348 } 349 350 static const struct iio_info sun4i_gpadc_iio_info = { 351 .read_raw = sun4i_gpadc_read_raw, 352 }; 353 354 static irqreturn_t sun4i_gpadc_temp_data_irq_handler(int irq, void *dev_id) 355 { 356 struct sun4i_gpadc_iio *info = dev_id; 357 358 if (atomic_read(&info->ignore_temp_data_irq)) 359 goto out; 360 361 if (!regmap_read(info->regmap, SUN4I_GPADC_TEMP_DATA, &info->temp_data)) 362 complete(&info->completion); 363 364 out: 365 return IRQ_HANDLED; 366 } 367 368 static irqreturn_t sun4i_gpadc_fifo_data_irq_handler(int irq, void *dev_id) 369 { 370 struct sun4i_gpadc_iio *info = dev_id; 371 372 if (atomic_read(&info->ignore_fifo_data_irq)) 373 goto out; 374 375 if (!regmap_read(info->regmap, SUN4I_GPADC_DATA, &info->adc_data)) 376 complete(&info->completion); 377 378 out: 379 return IRQ_HANDLED; 380 } 381 382 static int sun4i_gpadc_runtime_suspend(struct device *dev) 383 { 384 struct sun4i_gpadc_iio *info = iio_priv(dev_get_drvdata(dev)); 385 386 /* Disable the ADC on IP */ 387 regmap_write(info->regmap, SUN4I_GPADC_CTRL1, 0); 388 /* Disable temperature sensor on IP */ 389 regmap_write(info->regmap, SUN4I_GPADC_TPR, 0); 390 391 return 0; 392 } 393 394 static int sun4i_gpadc_runtime_resume(struct device *dev) 395 { 396 struct sun4i_gpadc_iio *info = iio_priv(dev_get_drvdata(dev)); 397 398 /* clkin = 6MHz */ 399 regmap_write(info->regmap, SUN4I_GPADC_CTRL0, 400 SUN4I_GPADC_CTRL0_ADC_CLK_DIVIDER(2) | 401 SUN4I_GPADC_CTRL0_FS_DIV(7) | 402 SUN4I_GPADC_CTRL0_T_ACQ(63)); 403 regmap_write(info->regmap, SUN4I_GPADC_CTRL1, info->data->tp_mode_en); 404 regmap_write(info->regmap, SUN4I_GPADC_CTRL3, 405 SUN4I_GPADC_CTRL3_FILTER_EN | 406 SUN4I_GPADC_CTRL3_FILTER_TYPE(1)); 407 /* period = SUN4I_GPADC_TPR_TEMP_PERIOD * 256 * 16 / clkin; ~0.6s */ 408 regmap_write(info->regmap, SUN4I_GPADC_TPR, 409 SUN4I_GPADC_TPR_TEMP_ENABLE | 410 SUN4I_GPADC_TPR_TEMP_PERIOD(800)); 411 412 return 0; 413 } 414 415 static int sun4i_gpadc_get_temp(void *data, int *temp) 416 { 417 struct sun4i_gpadc_iio *info = data; 418 int val, scale, offset; 419 420 if (sun4i_gpadc_temp_read(info->indio_dev, &val)) 421 return -ETIMEDOUT; 422 423 sun4i_gpadc_temp_scale(info->indio_dev, &scale); 424 sun4i_gpadc_temp_offset(info->indio_dev, &offset); 425 426 *temp = (val + offset) * scale; 427 428 return 0; 429 } 430 431 static const struct thermal_zone_of_device_ops sun4i_ts_tz_ops = { 432 .get_temp = &sun4i_gpadc_get_temp, 433 }; 434 435 static const struct dev_pm_ops sun4i_gpadc_pm_ops = { 436 .runtime_suspend = &sun4i_gpadc_runtime_suspend, 437 .runtime_resume = &sun4i_gpadc_runtime_resume, 438 }; 439 440 static int sun4i_irq_init(struct platform_device *pdev, const char *name, 441 irq_handler_t handler, const char *devname, 442 unsigned int *irq, atomic_t *atomic) 443 { 444 int ret; 445 struct sun4i_gpadc_dev *mfd_dev = dev_get_drvdata(pdev->dev.parent); 446 struct sun4i_gpadc_iio *info = iio_priv(dev_get_drvdata(&pdev->dev)); 447 448 /* 449 * Once the interrupt is activated, the IP continuously performs 450 * conversions thus throws interrupts. The interrupt is activated right 451 * after being requested but we want to control when these interrupts 452 * occur thus we disable it right after being requested. However, an 453 * interrupt might occur between these two instructions and we have to 454 * make sure that does not happen, by using atomic flags. We set the 455 * flag before requesting the interrupt and unset it right after 456 * disabling the interrupt. When an interrupt occurs between these two 457 * instructions, reading the atomic flag will tell us to ignore the 458 * interrupt. 459 */ 460 atomic_set(atomic, 1); 461 462 ret = platform_get_irq_byname(pdev, name); 463 if (ret < 0) { 464 dev_err(&pdev->dev, "no %s interrupt registered\n", name); 465 return ret; 466 } 467 468 ret = regmap_irq_get_virq(mfd_dev->regmap_irqc, ret); 469 if (ret < 0) { 470 dev_err(&pdev->dev, "failed to get virq for irq %s\n", name); 471 return ret; 472 } 473 474 *irq = ret; 475 ret = devm_request_any_context_irq(&pdev->dev, *irq, handler, 0, 476 devname, info); 477 if (ret < 0) { 478 dev_err(&pdev->dev, "could not request %s interrupt: %d\n", 479 name, ret); 480 return ret; 481 } 482 483 disable_irq(*irq); 484 atomic_set(atomic, 0); 485 486 return 0; 487 } 488 489 static const struct of_device_id sun4i_gpadc_of_id[] = { 490 { 491 .compatible = "allwinner,sun8i-a33-ths", 492 .data = &sun8i_a33_gpadc_data, 493 }, 494 { /* sentinel */ } 495 }; 496 497 static int sun4i_gpadc_probe_dt(struct platform_device *pdev, 498 struct iio_dev *indio_dev) 499 { 500 struct sun4i_gpadc_iio *info = iio_priv(indio_dev); 501 struct resource *mem; 502 void __iomem *base; 503 int ret; 504 505 info->data = of_device_get_match_data(&pdev->dev); 506 if (!info->data) 507 return -ENODEV; 508 509 info->no_irq = true; 510 indio_dev->num_channels = ARRAY_SIZE(sun8i_a33_gpadc_channels); 511 indio_dev->channels = sun8i_a33_gpadc_channels; 512 513 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 514 base = devm_ioremap_resource(&pdev->dev, mem); 515 if (IS_ERR(base)) 516 return PTR_ERR(base); 517 518 info->regmap = devm_regmap_init_mmio(&pdev->dev, base, 519 &sun4i_gpadc_regmap_config); 520 if (IS_ERR(info->regmap)) { 521 ret = PTR_ERR(info->regmap); 522 dev_err(&pdev->dev, "failed to init regmap: %d\n", ret); 523 return ret; 524 } 525 526 if (IS_ENABLED(CONFIG_THERMAL_OF)) 527 info->sensor_device = &pdev->dev; 528 529 return 0; 530 } 531 532 static int sun4i_gpadc_probe_mfd(struct platform_device *pdev, 533 struct iio_dev *indio_dev) 534 { 535 struct sun4i_gpadc_iio *info = iio_priv(indio_dev); 536 struct sun4i_gpadc_dev *sun4i_gpadc_dev = 537 dev_get_drvdata(pdev->dev.parent); 538 int ret; 539 540 info->no_irq = false; 541 info->regmap = sun4i_gpadc_dev->regmap; 542 543 indio_dev->num_channels = ARRAY_SIZE(sun4i_gpadc_channels); 544 indio_dev->channels = sun4i_gpadc_channels; 545 546 info->data = (struct gpadc_data *)platform_get_device_id(pdev)->driver_data; 547 548 /* 549 * Since the controller needs to be in touchscreen mode for its thermal 550 * sensor to operate properly, and that switching between the two modes 551 * needs a delay, always registering in the thermal framework will 552 * significantly slow down the conversion rate of the ADCs. 553 * 554 * Therefore, instead of depending on THERMAL_OF in Kconfig, we only 555 * register the sensor if that option is enabled, eventually leaving 556 * that choice to the user. 557 */ 558 559 if (IS_ENABLED(CONFIG_THERMAL_OF)) { 560 /* 561 * This driver is a child of an MFD which has a node in the DT 562 * but not its children, because of DT backward compatibility 563 * for A10, A13 and A31 SoCs. Therefore, the resulting devices 564 * of this driver do not have an of_node variable. 565 * However, its parent (the MFD driver) has an of_node variable 566 * and since devm_thermal_zone_of_sensor_register uses its first 567 * argument to match the phandle defined in the node of the 568 * thermal driver with the of_node of the device passed as first 569 * argument and the third argument to call ops from 570 * thermal_zone_of_device_ops, the solution is to use the parent 571 * device as first argument to match the phandle with its 572 * of_node, and the device from this driver as third argument to 573 * return the temperature. 574 */ 575 info->sensor_device = pdev->dev.parent; 576 } else { 577 indio_dev->num_channels = 578 ARRAY_SIZE(sun4i_gpadc_channels_no_temp); 579 indio_dev->channels = sun4i_gpadc_channels_no_temp; 580 } 581 582 if (IS_ENABLED(CONFIG_THERMAL_OF)) { 583 ret = sun4i_irq_init(pdev, "TEMP_DATA_PENDING", 584 sun4i_gpadc_temp_data_irq_handler, 585 "temp_data", &info->temp_data_irq, 586 &info->ignore_temp_data_irq); 587 if (ret < 0) 588 return ret; 589 } 590 591 ret = sun4i_irq_init(pdev, "FIFO_DATA_PENDING", 592 sun4i_gpadc_fifo_data_irq_handler, "fifo_data", 593 &info->fifo_data_irq, &info->ignore_fifo_data_irq); 594 if (ret < 0) 595 return ret; 596 597 if (IS_ENABLED(CONFIG_THERMAL_OF)) { 598 ret = iio_map_array_register(indio_dev, sun4i_gpadc_hwmon_maps); 599 if (ret < 0) { 600 dev_err(&pdev->dev, 601 "failed to register iio map array\n"); 602 return ret; 603 } 604 } 605 606 return 0; 607 } 608 609 static int sun4i_gpadc_probe(struct platform_device *pdev) 610 { 611 struct sun4i_gpadc_iio *info; 612 struct iio_dev *indio_dev; 613 int ret; 614 615 indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*info)); 616 if (!indio_dev) 617 return -ENOMEM; 618 619 info = iio_priv(indio_dev); 620 platform_set_drvdata(pdev, indio_dev); 621 622 mutex_init(&info->mutex); 623 info->indio_dev = indio_dev; 624 init_completion(&info->completion); 625 indio_dev->name = dev_name(&pdev->dev); 626 indio_dev->dev.parent = &pdev->dev; 627 indio_dev->dev.of_node = pdev->dev.of_node; 628 indio_dev->info = &sun4i_gpadc_iio_info; 629 indio_dev->modes = INDIO_DIRECT_MODE; 630 631 if (pdev->dev.of_node) 632 ret = sun4i_gpadc_probe_dt(pdev, indio_dev); 633 else 634 ret = sun4i_gpadc_probe_mfd(pdev, indio_dev); 635 636 if (ret) 637 return ret; 638 639 pm_runtime_set_autosuspend_delay(&pdev->dev, 640 SUN4I_GPADC_AUTOSUSPEND_DELAY); 641 pm_runtime_use_autosuspend(&pdev->dev); 642 pm_runtime_set_suspended(&pdev->dev); 643 pm_runtime_enable(&pdev->dev); 644 645 if (IS_ENABLED(CONFIG_THERMAL_OF)) { 646 info->tzd = thermal_zone_of_sensor_register(info->sensor_device, 647 0, info, 648 &sun4i_ts_tz_ops); 649 /* 650 * Do not fail driver probing when failing to register in 651 * thermal because no thermal DT node is found. 652 */ 653 if (IS_ERR(info->tzd) && PTR_ERR(info->tzd) != -ENODEV) { 654 dev_err(&pdev->dev, 655 "could not register thermal sensor: %ld\n", 656 PTR_ERR(info->tzd)); 657 return PTR_ERR(info->tzd); 658 } 659 } 660 661 ret = devm_iio_device_register(&pdev->dev, indio_dev); 662 if (ret < 0) { 663 dev_err(&pdev->dev, "could not register the device\n"); 664 goto err_map; 665 } 666 667 return 0; 668 669 err_map: 670 if (!info->no_irq && IS_ENABLED(CONFIG_THERMAL_OF)) 671 iio_map_array_unregister(indio_dev); 672 673 pm_runtime_put(&pdev->dev); 674 pm_runtime_disable(&pdev->dev); 675 676 return ret; 677 } 678 679 static int sun4i_gpadc_remove(struct platform_device *pdev) 680 { 681 struct iio_dev *indio_dev = platform_get_drvdata(pdev); 682 struct sun4i_gpadc_iio *info = iio_priv(indio_dev); 683 684 pm_runtime_put(&pdev->dev); 685 pm_runtime_disable(&pdev->dev); 686 687 if (!IS_ENABLED(CONFIG_THERMAL_OF)) 688 return 0; 689 690 thermal_zone_of_sensor_unregister(info->sensor_device, info->tzd); 691 692 if (!info->no_irq) 693 iio_map_array_unregister(indio_dev); 694 695 return 0; 696 } 697 698 static const struct platform_device_id sun4i_gpadc_id[] = { 699 { "sun4i-a10-gpadc-iio", (kernel_ulong_t)&sun4i_gpadc_data }, 700 { "sun5i-a13-gpadc-iio", (kernel_ulong_t)&sun5i_gpadc_data }, 701 { "sun6i-a31-gpadc-iio", (kernel_ulong_t)&sun6i_gpadc_data }, 702 { /* sentinel */ }, 703 }; 704 MODULE_DEVICE_TABLE(platform, sun4i_gpadc_id); 705 706 static struct platform_driver sun4i_gpadc_driver = { 707 .driver = { 708 .name = "sun4i-gpadc-iio", 709 .of_match_table = sun4i_gpadc_of_id, 710 .pm = &sun4i_gpadc_pm_ops, 711 }, 712 .id_table = sun4i_gpadc_id, 713 .probe = sun4i_gpadc_probe, 714 .remove = sun4i_gpadc_remove, 715 }; 716 MODULE_DEVICE_TABLE(of, sun4i_gpadc_of_id); 717 718 module_platform_driver(sun4i_gpadc_driver); 719 720 MODULE_DESCRIPTION("ADC driver for sunxi platforms"); 721 MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>"); 722 MODULE_LICENSE("GPL v2"); 723