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1// SPDX-License-Identifier: GPL-2.02/* ADC driver for sunxi platforms' (A10, A13 and A31) GPADC3 *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 touchscreen7 * controller and a thermal sensor.8 * The thermal sensor works only when the ADC acts as a touchscreen controller9 * and is configured to throw an interrupt every fixed periods of time (let say10 * every X seconds).11 * One would be tempted to disable the IP on the hardware side rather than12 * disabling interrupts to save some power but that resets the internal clock of13 * the IP, resulting in having to wait X seconds every time we want to read the14 * value of the thermal sensor.15 * This is also the reason of using autosuspend in pm_runtime. If there was no16 * autosuspend, the thermal sensor would need X seconds after every17 * pm_runtime_get_sync to get a value from the ADC. The autosuspend allows the18 * thermal sensor to be requested again in a certain time span before it gets19 * 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/platform_device.h>28#include <linux/pm_runtime.h>29#include <linux/regmap.h>30#include <linux/thermal.h>31#include <linux/delay.h>32 33#include <linux/iio/iio.h>34#include <linux/iio/driver.h>35#include <linux/iio/machine.h>36#include <linux/mfd/sun4i-gpadc.h>37 38static unsigned int sun4i_gpadc_chan_select(unsigned int chan)39{40 return SUN4I_GPADC_CTRL1_ADC_CHAN_SELECT(chan);41}42 43static unsigned int sun6i_gpadc_chan_select(unsigned int chan)44{45 return SUN6I_GPADC_CTRL1_ADC_CHAN_SELECT(chan);46}47 48struct gpadc_data {49 int temp_offset;50 int temp_scale;51 unsigned int tp_mode_en;52 unsigned int tp_adc_select;53 unsigned int (*adc_chan_select)(unsigned int chan);54 unsigned int adc_chan_mask;55};56 57static const struct gpadc_data sun4i_gpadc_data = {58 .temp_offset = -1932,59 .temp_scale = 133,60 .tp_mode_en = SUN4I_GPADC_CTRL1_TP_MODE_EN,61 .tp_adc_select = SUN4I_GPADC_CTRL1_TP_ADC_SELECT,62 .adc_chan_select = &sun4i_gpadc_chan_select,63 .adc_chan_mask = SUN4I_GPADC_CTRL1_ADC_CHAN_MASK,64};65 66static const struct gpadc_data sun5i_gpadc_data = {67 .temp_offset = -1447,68 .temp_scale = 100,69 .tp_mode_en = SUN4I_GPADC_CTRL1_TP_MODE_EN,70 .tp_adc_select = SUN4I_GPADC_CTRL1_TP_ADC_SELECT,71 .adc_chan_select = &sun4i_gpadc_chan_select,72 .adc_chan_mask = SUN4I_GPADC_CTRL1_ADC_CHAN_MASK,73};74 75static const struct gpadc_data sun6i_gpadc_data = {76 .temp_offset = -1623,77 .temp_scale = 167,78 .tp_mode_en = SUN6I_GPADC_CTRL1_TP_MODE_EN,79 .tp_adc_select = SUN6I_GPADC_CTRL1_TP_ADC_SELECT,80 .adc_chan_select = &sun6i_gpadc_chan_select,81 .adc_chan_mask = SUN6I_GPADC_CTRL1_ADC_CHAN_MASK,82};83 84static const struct gpadc_data sun8i_a33_gpadc_data = {85 .temp_offset = -1662,86 .temp_scale = 162,87 .tp_mode_en = SUN8I_GPADC_CTRL1_CHOP_TEMP_EN,88};89 90struct sun4i_gpadc_iio {91 struct iio_dev *indio_dev;92 struct completion completion;93 int temp_data;94 u32 adc_data;95 struct regmap *regmap;96 unsigned int fifo_data_irq;97 atomic_t ignore_fifo_data_irq;98 unsigned int temp_data_irq;99 atomic_t ignore_temp_data_irq;100 const struct gpadc_data *data;101 bool no_irq;102 /* prevents concurrent reads of temperature and ADC */103 struct mutex mutex;104 struct thermal_zone_device *tzd;105 struct device *sensor_device;106};107 108#define SUN4I_GPADC_ADC_CHANNEL(_channel, _name) { \109 .type = IIO_VOLTAGE, \110 .indexed = 1, \111 .channel = _channel, \112 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \113 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \114 .datasheet_name = _name, \115}116 117static struct iio_map sun4i_gpadc_hwmon_maps[] = {118 {119 .adc_channel_label = "temp_adc",120 .consumer_dev_name = "iio_hwmon.0",121 },122 { /* sentinel */ },123};124 125static const struct iio_chan_spec sun4i_gpadc_channels[] = {126 SUN4I_GPADC_ADC_CHANNEL(0, "adc_chan0"),127 SUN4I_GPADC_ADC_CHANNEL(1, "adc_chan1"),128 SUN4I_GPADC_ADC_CHANNEL(2, "adc_chan2"),129 SUN4I_GPADC_ADC_CHANNEL(3, "adc_chan3"),130 {131 .type = IIO_TEMP,132 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |133 BIT(IIO_CHAN_INFO_SCALE) |134 BIT(IIO_CHAN_INFO_OFFSET),135 .datasheet_name = "temp_adc",136 },137};138 139static const struct iio_chan_spec sun4i_gpadc_channels_no_temp[] = {140 SUN4I_GPADC_ADC_CHANNEL(0, "adc_chan0"),141 SUN4I_GPADC_ADC_CHANNEL(1, "adc_chan1"),142 SUN4I_GPADC_ADC_CHANNEL(2, "adc_chan2"),143 SUN4I_GPADC_ADC_CHANNEL(3, "adc_chan3"),144};145 146static const struct iio_chan_spec sun8i_a33_gpadc_channels[] = {147 {148 .type = IIO_TEMP,149 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |150 BIT(IIO_CHAN_INFO_SCALE) |151 BIT(IIO_CHAN_INFO_OFFSET),152 .datasheet_name = "temp_adc",153 },154};155 156static const struct regmap_config sun4i_gpadc_regmap_config = {157 .reg_bits = 32,158 .val_bits = 32,159 .reg_stride = 4,160 .fast_io = true,161};162 163static int sun4i_prepare_for_irq(struct iio_dev *indio_dev, int channel,164 unsigned int irq)165{166 struct sun4i_gpadc_iio *info = iio_priv(indio_dev);167 int ret;168 u32 reg;169 170 pm_runtime_get_sync(indio_dev->dev.parent);171 172 reinit_completion(&info->completion);173 174 ret = regmap_write(info->regmap, SUN4I_GPADC_INT_FIFOC,175 SUN4I_GPADC_INT_FIFOC_TP_FIFO_TRIG_LEVEL(1) |176 SUN4I_GPADC_INT_FIFOC_TP_FIFO_FLUSH);177 if (ret)178 return ret;179 180 ret = regmap_read(info->regmap, SUN4I_GPADC_CTRL1, ®);181 if (ret)182 return ret;183 184 if (irq == info->fifo_data_irq) {185 ret = regmap_write(info->regmap, SUN4I_GPADC_CTRL1,186 info->data->tp_mode_en |187 info->data->tp_adc_select |188 info->data->adc_chan_select(channel));189 /*190 * When the IP changes channel, it needs a bit of time to get191 * correct values.192 */193 if ((reg & info->data->adc_chan_mask) !=194 info->data->adc_chan_select(channel))195 mdelay(10);196 197 } else {198 /*199 * The temperature sensor returns valid data only when the ADC200 * operates in touchscreen mode.201 */202 ret = regmap_write(info->regmap, SUN4I_GPADC_CTRL1,203 info->data->tp_mode_en);204 }205 206 if (ret)207 return ret;208 209 /*210 * When the IP changes mode between ADC or touchscreen, it211 * needs a bit of time to get correct values.212 */213 if ((reg & info->data->tp_adc_select) != info->data->tp_adc_select)214 mdelay(100);215 216 return 0;217}218 219static int sun4i_gpadc_read(struct iio_dev *indio_dev, int channel, int *val,220 unsigned int irq)221{222 struct sun4i_gpadc_iio *info = iio_priv(indio_dev);223 int ret;224 225 mutex_lock(&info->mutex);226 227 ret = sun4i_prepare_for_irq(indio_dev, channel, irq);228 if (ret)229 goto err;230 231 enable_irq(irq);232 233 /*234 * The temperature sensor throws an interruption periodically (currently235 * set at periods of ~0.6s in sun4i_gpadc_runtime_resume). A 1s delay236 * makes sure an interruption occurs in normal conditions. If it doesn't237 * occur, then there is a timeout.238 */239 if (!wait_for_completion_timeout(&info->completion,240 msecs_to_jiffies(1000))) {241 ret = -ETIMEDOUT;242 goto err;243 }244 245 if (irq == info->fifo_data_irq)246 *val = info->adc_data;247 else248 *val = info->temp_data;249 250 ret = 0;251 pm_runtime_mark_last_busy(indio_dev->dev.parent);252 253err:254 pm_runtime_put_autosuspend(indio_dev->dev.parent);255 disable_irq(irq);256 mutex_unlock(&info->mutex);257 258 return ret;259}260 261static int sun4i_gpadc_adc_read(struct iio_dev *indio_dev, int channel,262 int *val)263{264 struct sun4i_gpadc_iio *info = iio_priv(indio_dev);265 266 return sun4i_gpadc_read(indio_dev, channel, val, info->fifo_data_irq);267}268 269static int sun4i_gpadc_temp_read(struct iio_dev *indio_dev, int *val)270{271 struct sun4i_gpadc_iio *info = iio_priv(indio_dev);272 273 if (info->no_irq) {274 pm_runtime_get_sync(indio_dev->dev.parent);275 276 regmap_read(info->regmap, SUN4I_GPADC_TEMP_DATA, val);277 278 pm_runtime_mark_last_busy(indio_dev->dev.parent);279 pm_runtime_put_autosuspend(indio_dev->dev.parent);280 281 return 0;282 }283 284 return sun4i_gpadc_read(indio_dev, 0, val, info->temp_data_irq);285}286 287static int sun4i_gpadc_temp_offset(struct iio_dev *indio_dev, int *val)288{289 struct sun4i_gpadc_iio *info = iio_priv(indio_dev);290 291 *val = info->data->temp_offset;292 293 return 0;294}295 296static int sun4i_gpadc_temp_scale(struct iio_dev *indio_dev, int *val)297{298 struct sun4i_gpadc_iio *info = iio_priv(indio_dev);299 300 *val = info->data->temp_scale;301 302 return 0;303}304 305static int sun4i_gpadc_read_raw(struct iio_dev *indio_dev,306 struct iio_chan_spec const *chan, int *val,307 int *val2, long mask)308{309 int ret;310 311 switch (mask) {312 case IIO_CHAN_INFO_OFFSET:313 ret = sun4i_gpadc_temp_offset(indio_dev, val);314 if (ret)315 return ret;316 317 return IIO_VAL_INT;318 case IIO_CHAN_INFO_RAW:319 if (chan->type == IIO_VOLTAGE)320 ret = sun4i_gpadc_adc_read(indio_dev, chan->channel,321 val);322 else323 ret = sun4i_gpadc_temp_read(indio_dev, val);324 325 if (ret)326 return ret;327 328 return IIO_VAL_INT;329 case IIO_CHAN_INFO_SCALE:330 if (chan->type == IIO_VOLTAGE) {331 /* 3000mV / 4096 * raw */332 *val = 0;333 *val2 = 732421875;334 return IIO_VAL_INT_PLUS_NANO;335 }336 337 ret = sun4i_gpadc_temp_scale(indio_dev, val);338 if (ret)339 return ret;340 341 return IIO_VAL_INT;342 default:343 return -EINVAL;344 }345 346 return -EINVAL;347}348 349static const struct iio_info sun4i_gpadc_iio_info = {350 .read_raw = sun4i_gpadc_read_raw,351};352 353static irqreturn_t sun4i_gpadc_temp_data_irq_handler(int irq, void *dev_id)354{355 struct sun4i_gpadc_iio *info = dev_id;356 357 if (atomic_read(&info->ignore_temp_data_irq))358 goto out;359 360 if (!regmap_read(info->regmap, SUN4I_GPADC_TEMP_DATA, &info->temp_data))361 complete(&info->completion);362 363out:364 return IRQ_HANDLED;365}366 367static irqreturn_t sun4i_gpadc_fifo_data_irq_handler(int irq, void *dev_id)368{369 struct sun4i_gpadc_iio *info = dev_id;370 371 if (atomic_read(&info->ignore_fifo_data_irq))372 goto out;373 374 if (!regmap_read(info->regmap, SUN4I_GPADC_DATA, &info->adc_data))375 complete(&info->completion);376 377out:378 return IRQ_HANDLED;379}380 381static int sun4i_gpadc_runtime_suspend(struct device *dev)382{383 struct sun4i_gpadc_iio *info = iio_priv(dev_get_drvdata(dev));384 385 /* Disable the ADC on IP */386 regmap_write(info->regmap, SUN4I_GPADC_CTRL1, 0);387 /* Disable temperature sensor on IP */388 regmap_write(info->regmap, SUN4I_GPADC_TPR, 0);389 390 return 0;391}392 393static int sun4i_gpadc_runtime_resume(struct device *dev)394{395 struct sun4i_gpadc_iio *info = iio_priv(dev_get_drvdata(dev));396 397 /* clkin = 6MHz */398 regmap_write(info->regmap, SUN4I_GPADC_CTRL0,399 SUN4I_GPADC_CTRL0_ADC_CLK_DIVIDER(2) |400 SUN4I_GPADC_CTRL0_FS_DIV(7) |401 SUN4I_GPADC_CTRL0_T_ACQ(63));402 regmap_write(info->regmap, SUN4I_GPADC_CTRL1, info->data->tp_mode_en);403 regmap_write(info->regmap, SUN4I_GPADC_CTRL3,404 SUN4I_GPADC_CTRL3_FILTER_EN |405 SUN4I_GPADC_CTRL3_FILTER_TYPE(1));406 /* period = SUN4I_GPADC_TPR_TEMP_PERIOD * 256 * 16 / clkin; ~0.6s */407 regmap_write(info->regmap, SUN4I_GPADC_TPR,408 SUN4I_GPADC_TPR_TEMP_ENABLE |409 SUN4I_GPADC_TPR_TEMP_PERIOD(800));410 411 return 0;412}413 414static int sun4i_gpadc_get_temp(struct thermal_zone_device *tz, int *temp)415{416 struct sun4i_gpadc_iio *info = thermal_zone_device_priv(tz);417 int val, scale, offset;418 419 if (sun4i_gpadc_temp_read(info->indio_dev, &val))420 return -ETIMEDOUT;421 422 sun4i_gpadc_temp_scale(info->indio_dev, &scale);423 sun4i_gpadc_temp_offset(info->indio_dev, &offset);424 425 *temp = (val + offset) * scale;426 427 return 0;428}429 430static const struct thermal_zone_device_ops sun4i_ts_tz_ops = {431 .get_temp = &sun4i_gpadc_get_temp,432};433 434static const struct dev_pm_ops sun4i_gpadc_pm_ops = {435 .runtime_suspend = &sun4i_gpadc_runtime_suspend,436 .runtime_resume = &sun4i_gpadc_runtime_resume,437};438 439static int sun4i_irq_init(struct platform_device *pdev, const char *name,440 irq_handler_t handler, const char *devname,441 unsigned int *irq, atomic_t *atomic)442{443 int ret;444 struct sun4i_gpadc_dev *mfd_dev = dev_get_drvdata(pdev->dev.parent);445 struct sun4i_gpadc_iio *info = iio_priv(dev_get_drvdata(&pdev->dev));446 447 /*448 * Once the interrupt is activated, the IP continuously performs449 * conversions thus throws interrupts. The interrupt is activated right450 * after being requested but we want to control when these interrupts451 * occur thus we disable it right after being requested. However, an452 * interrupt might occur between these two instructions and we have to453 * make sure that does not happen, by using atomic flags. We set the454 * flag before requesting the interrupt and unset it right after455 * disabling the interrupt. When an interrupt occurs between these two456 * instructions, reading the atomic flag will tell us to ignore the457 * interrupt.458 */459 atomic_set(atomic, 1);460 461 ret = platform_get_irq_byname(pdev, name);462 if (ret < 0)463 return ret;464 465 ret = regmap_irq_get_virq(mfd_dev->regmap_irqc, ret);466 if (ret < 0) {467 dev_err(&pdev->dev, "failed to get virq for irq %s\n", name);468 return ret;469 }470 471 *irq = ret;472 ret = devm_request_any_context_irq(&pdev->dev, *irq, handler,473 IRQF_NO_AUTOEN,474 devname, info);475 if (ret < 0) {476 dev_err(&pdev->dev, "could not request %s interrupt: %d\n",477 name, ret);478 return ret;479 }480 481 atomic_set(atomic, 0);482 483 return 0;484}485 486static const struct of_device_id sun4i_gpadc_of_id[] = {487 {488 .compatible = "allwinner,sun8i-a33-ths",489 .data = &sun8i_a33_gpadc_data,490 },491 { /* sentinel */ }492};493 494static int sun4i_gpadc_probe_dt(struct platform_device *pdev,495 struct iio_dev *indio_dev)496{497 struct sun4i_gpadc_iio *info = iio_priv(indio_dev);498 void __iomem *base;499 int ret;500 501 info->data = of_device_get_match_data(&pdev->dev);502 if (!info->data)503 return -ENODEV;504 505 info->no_irq = true;506 indio_dev->num_channels = ARRAY_SIZE(sun8i_a33_gpadc_channels);507 indio_dev->channels = sun8i_a33_gpadc_channels;508 509 base = devm_platform_ioremap_resource(pdev, 0);510 if (IS_ERR(base))511 return PTR_ERR(base);512 513 info->regmap = devm_regmap_init_mmio(&pdev->dev, base,514 &sun4i_gpadc_regmap_config);515 if (IS_ERR(info->regmap)) {516 ret = PTR_ERR(info->regmap);517 dev_err(&pdev->dev, "failed to init regmap: %d\n", ret);518 return ret;519 }520 521 if (IS_ENABLED(CONFIG_THERMAL_OF))522 info->sensor_device = &pdev->dev;523 524 return 0;525}526 527static int sun4i_gpadc_probe_mfd(struct platform_device *pdev,528 struct iio_dev *indio_dev)529{530 struct sun4i_gpadc_iio *info = iio_priv(indio_dev);531 struct sun4i_gpadc_dev *sun4i_gpadc_dev =532 dev_get_drvdata(pdev->dev.parent);533 int ret;534 535 info->no_irq = false;536 info->regmap = sun4i_gpadc_dev->regmap;537 538 indio_dev->num_channels = ARRAY_SIZE(sun4i_gpadc_channels);539 indio_dev->channels = sun4i_gpadc_channels;540 541 info->data = (struct gpadc_data *)platform_get_device_id(pdev)->driver_data;542 543 /*544 * Since the controller needs to be in touchscreen mode for its thermal545 * sensor to operate properly, and that switching between the two modes546 * needs a delay, always registering in the thermal framework will547 * significantly slow down the conversion rate of the ADCs.548 *549 * Therefore, instead of depending on THERMAL_OF in Kconfig, we only550 * register the sensor if that option is enabled, eventually leaving551 * that choice to the user.552 */553 554 if (IS_ENABLED(CONFIG_THERMAL_OF)) {555 /*556 * This driver is a child of an MFD which has a node in the DT557 * but not its children, because of DT backward compatibility558 * for A10, A13 and A31 SoCs. Therefore, the resulting devices559 * of this driver do not have an of_node variable.560 * However, its parent (the MFD driver) has an of_node variable561 * and since devm_thermal_zone_of_sensor_register uses its first562 * argument to match the phandle defined in the node of the563 * thermal driver with the of_node of the device passed as first564 * argument and the third argument to call ops from565 * thermal_zone_of_device_ops, the solution is to use the parent566 * device as first argument to match the phandle with its567 * of_node, and the device from this driver as third argument to568 * return the temperature.569 */570 info->sensor_device = pdev->dev.parent;571 } else {572 indio_dev->num_channels =573 ARRAY_SIZE(sun4i_gpadc_channels_no_temp);574 indio_dev->channels = sun4i_gpadc_channels_no_temp;575 }576 577 if (IS_ENABLED(CONFIG_THERMAL_OF)) {578 ret = sun4i_irq_init(pdev, "TEMP_DATA_PENDING",579 sun4i_gpadc_temp_data_irq_handler,580 "temp_data", &info->temp_data_irq,581 &info->ignore_temp_data_irq);582 if (ret < 0)583 return ret;584 }585 586 ret = sun4i_irq_init(pdev, "FIFO_DATA_PENDING",587 sun4i_gpadc_fifo_data_irq_handler, "fifo_data",588 &info->fifo_data_irq, &info->ignore_fifo_data_irq);589 if (ret < 0)590 return ret;591 592 if (IS_ENABLED(CONFIG_THERMAL_OF)) {593 ret = iio_map_array_register(indio_dev, sun4i_gpadc_hwmon_maps);594 if (ret < 0) {595 dev_err(&pdev->dev,596 "failed to register iio map array\n");597 return ret;598 }599 }600 601 return 0;602}603 604static int sun4i_gpadc_probe(struct platform_device *pdev)605{606 struct sun4i_gpadc_iio *info;607 struct iio_dev *indio_dev;608 int ret;609 610 indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*info));611 if (!indio_dev)612 return -ENOMEM;613 614 info = iio_priv(indio_dev);615 platform_set_drvdata(pdev, indio_dev);616 617 mutex_init(&info->mutex);618 info->indio_dev = indio_dev;619 init_completion(&info->completion);620 indio_dev->name = dev_name(&pdev->dev);621 indio_dev->info = &sun4i_gpadc_iio_info;622 indio_dev->modes = INDIO_DIRECT_MODE;623 624 if (pdev->dev.of_node)625 ret = sun4i_gpadc_probe_dt(pdev, indio_dev);626 else627 ret = sun4i_gpadc_probe_mfd(pdev, indio_dev);628 629 if (ret)630 return ret;631 632 pm_runtime_set_autosuspend_delay(&pdev->dev,633 SUN4I_GPADC_AUTOSUSPEND_DELAY);634 pm_runtime_use_autosuspend(&pdev->dev);635 pm_runtime_set_suspended(&pdev->dev);636 pm_runtime_enable(&pdev->dev);637 638 if (IS_ENABLED(CONFIG_THERMAL_OF)) {639 info->tzd = devm_thermal_of_zone_register(info->sensor_device,640 0, info,641 &sun4i_ts_tz_ops);642 /*643 * Do not fail driver probing when failing to register in644 * thermal because no thermal DT node is found.645 */646 if (IS_ERR(info->tzd) && PTR_ERR(info->tzd) != -ENODEV) {647 dev_err(&pdev->dev,648 "could not register thermal sensor: %ld\n",649 PTR_ERR(info->tzd));650 return PTR_ERR(info->tzd);651 }652 }653 654 ret = devm_iio_device_register(&pdev->dev, indio_dev);655 if (ret < 0) {656 dev_err(&pdev->dev, "could not register the device\n");657 goto err_map;658 }659 660 return 0;661 662err_map:663 if (!info->no_irq && IS_ENABLED(CONFIG_THERMAL_OF))664 iio_map_array_unregister(indio_dev);665 666 pm_runtime_put(&pdev->dev);667 pm_runtime_disable(&pdev->dev);668 669 return ret;670}671 672static void sun4i_gpadc_remove(struct platform_device *pdev)673{674 struct iio_dev *indio_dev = platform_get_drvdata(pdev);675 struct sun4i_gpadc_iio *info = iio_priv(indio_dev);676 677 pm_runtime_put(&pdev->dev);678 pm_runtime_disable(&pdev->dev);679 680 if (!IS_ENABLED(CONFIG_THERMAL_OF))681 return;682 683 if (!info->no_irq)684 iio_map_array_unregister(indio_dev);685}686 687static const struct platform_device_id sun4i_gpadc_id[] = {688 { "sun4i-a10-gpadc-iio", (kernel_ulong_t)&sun4i_gpadc_data },689 { "sun5i-a13-gpadc-iio", (kernel_ulong_t)&sun5i_gpadc_data },690 { "sun6i-a31-gpadc-iio", (kernel_ulong_t)&sun6i_gpadc_data },691 { /* sentinel */ },692};693MODULE_DEVICE_TABLE(platform, sun4i_gpadc_id);694 695static struct platform_driver sun4i_gpadc_driver = {696 .driver = {697 .name = "sun4i-gpadc-iio",698 .of_match_table = sun4i_gpadc_of_id,699 .pm = &sun4i_gpadc_pm_ops,700 },701 .id_table = sun4i_gpadc_id,702 .probe = sun4i_gpadc_probe,703 .remove_new = sun4i_gpadc_remove,704};705MODULE_DEVICE_TABLE(of, sun4i_gpadc_of_id);706 707module_platform_driver(sun4i_gpadc_driver);708 709MODULE_DESCRIPTION("ADC driver for sunxi platforms");710MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>");711MODULE_LICENSE("GPL v2");712