Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 721 insertions, 0 deletions

diff --git a/drivers/iio/light/gp2ap002.c b/drivers/iio/light/gp2ap002.c
new file mode 100644
index 0000000000..fec10d5e03
--- /dev/null
+++ b/drivers/iio/light/gp2ap002.c
@@ -0,0 +1,721 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * These are the two Sharp GP2AP002 variants supported by this driver:
+ * GP2AP002A00F Ambient Light and Proximity Sensor
+ * GP2AP002S00F Proximity Sensor
+ *
+ * Copyright (C) 2020 Linaro Ltd.
+ * Author: Linus Walleij <linus.walleij@linaro.org>
+ *
+ * Based partly on the code in Sony Ericssons GP2AP00200F driver by
+ * Courtney Cavin and Oskar Andero in drivers/input/misc/gp2ap002a00f.c
+ * Based partly on a Samsung misc driver submitted by
+ * Donggeun Kim & Minkyu Kang in 2011:
+ * https://lore.kernel.org/lkml/1315556546-7445-1-git-send-email-dg77.kim@samsung.com/
+ * Based partly on a submission by
+ * Jonathan Bakker and Paweł Chmiel in january 2019:
+ * https://lore.kernel.org/linux-input/20190125175045.22576-1-pawel.mikolaj.chmiel@gmail.com/
+ * Based partly on code from the Samsung GT-S7710 by <mjchen@sta.samsung.com>
+ * Based partly on the code in LG Electronics GP2AP00200F driver by
+ * Kenobi Lee <sungyoung.lee@lge.com> and EunYoung Cho <ey.cho@lge.com>
+ */
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/regmap.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/events.h>
+#include <linux/iio/consumer.h> /* To get our ADC channel */
+#include <linux/iio/types.h> /* To deal with our ADC channel */
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/regulator/consumer.h>
+#include <linux/pm_runtime.h>
+#include <linux/interrupt.h>
+#include <linux/bits.h>
+#include <linux/math64.h>
+#include <linux/pm.h>
+
+#define GP2AP002_PROX_CHANNEL 0
+#define GP2AP002_ALS_CHANNEL 1
+
+/* ------------------------------------------------------------------------ */
+/* ADDRESS SYMBOL             DATA                                 Init R/W */
+/*                   D7    D6    D5    D4    D3    D2    D1    D0           */
+/* ------------------------------------------------------------------------ */
+/*    0      PROX     X     X     X     X     X     X     X    VO  H'00   R */
+/*    1      GAIN     X     X     X     X  LED0     X     X     X  H'00   W */
+/*    2       HYS  HYSD HYSC1 HYSC0     X HYSF3 HYSF2 HYSF1 HYSF0  H'00   W */
+/*    3     CYCLE     X     X CYCL2 CYCL1 CYCL0  OSC2     X     X  H'00   W */
+/*    4     OPMOD     X     X     X   ASD     X     X  VCON   SSD  H'00   W */
+/*    6       CON     X     X     X OCON1 OCON0     X     X     X  H'00   W */
+/* ------------------------------------------------------------------------ */
+/* VO   :Proximity sensing result(0: no detection, 1: detection)            */
+/* LED0 :Select switch for LED driver's On-registence(0:2x higher, 1:normal)*/
+/* HYSD/HYSF :Adjusts the receiver sensitivity                              */
+/* OSC  :Select switch internal clocl frequency hoppling(0:effective)       */
+/* CYCL :Determine the detection cycle(typically 8ms, up to 128x)           */
+/* SSD  :Software Shutdown function(0:shutdown, 1:operating)                */
+/* VCON :VOUT output method control(0:normal, 1:interrupt)                  */
+/* ASD  :Select switch for analog sleep function(0:ineffective, 1:effective)*/
+/* OCON :Select switch for enabling/disabling VOUT (00:enable, 11:disable)  */
+
+#define GP2AP002_PROX				0x00
+#define GP2AP002_GAIN				0x01
+#define GP2AP002_HYS				0x02
+#define GP2AP002_CYCLE				0x03
+#define GP2AP002_OPMOD				0x04
+#define GP2AP002_CON				0x06
+
+#define GP2AP002_PROX_VO_DETECT			BIT(0)
+
+/* Setting this bit to 0 means 2x higher LED resistance */
+#define GP2AP002_GAIN_LED_NORMAL		BIT(3)
+
+/*
+ * These bits adjusts the proximity sensitivity, determining characteristics
+ * of the detection distance and its hysteresis.
+ */
+#define GP2AP002_HYS_HYSD_SHIFT		7
+#define GP2AP002_HYS_HYSD_MASK		BIT(7)
+#define GP2AP002_HYS_HYSC_SHIFT		5
+#define GP2AP002_HYS_HYSC_MASK		GENMASK(6, 5)
+#define GP2AP002_HYS_HYSF_SHIFT		0
+#define GP2AP002_HYS_HYSF_MASK		GENMASK(3, 0)
+#define GP2AP002_HYS_MASK		(GP2AP002_HYS_HYSD_MASK | \
+					 GP2AP002_HYS_HYSC_MASK | \
+					 GP2AP002_HYS_HYSF_MASK)
+
+/*
+ * These values determine the detection cycle response time
+ * 0: 8ms, 1: 16ms, 2: 32ms, 3: 64ms, 4: 128ms,
+ * 5: 256ms, 6: 512ms, 7: 1024ms
+ */
+#define GP2AP002_CYCLE_CYCL_SHIFT	3
+#define GP2AP002_CYCLE_CYCL_MASK	GENMASK(5, 3)
+
+/*
+ * Select switch for internal clock frequency hopping
+ *	0: effective,
+ *	1: ineffective
+ */
+#define GP2AP002_CYCLE_OSC_EFFECTIVE	0
+#define GP2AP002_CYCLE_OSC_INEFFECTIVE	BIT(2)
+#define GP2AP002_CYCLE_OSC_MASK		BIT(2)
+
+/* Analog sleep effective */
+#define GP2AP002_OPMOD_ASD		BIT(4)
+/* Enable chip */
+#define GP2AP002_OPMOD_SSD_OPERATING	BIT(0)
+/* IRQ mode */
+#define GP2AP002_OPMOD_VCON_IRQ		BIT(1)
+#define GP2AP002_OPMOD_MASK		(BIT(0) | BIT(1) | BIT(4))
+
+/*
+ * Select switch for enabling/disabling Vout pin
+ * 0: enable
+ * 2: force to go Low
+ * 3: force to go High
+ */
+#define GP2AP002_CON_OCON_SHIFT		3
+#define GP2AP002_CON_OCON_ENABLE	(0x0 << GP2AP002_CON_OCON_SHIFT)
+#define GP2AP002_CON_OCON_LOW		(0x2 << GP2AP002_CON_OCON_SHIFT)
+#define GP2AP002_CON_OCON_HIGH		(0x3 << GP2AP002_CON_OCON_SHIFT)
+#define GP2AP002_CON_OCON_MASK		(0x3 << GP2AP002_CON_OCON_SHIFT)
+
+/**
+ * struct gp2ap002 - GP2AP002 state
+ * @map: regmap pointer for the i2c regmap
+ * @dev: pointer to parent device
+ * @vdd: regulator controlling VDD
+ * @vio: regulator controlling VIO
+ * @alsout: IIO ADC channel to convert the ALSOUT signal
+ * @hys_far: hysteresis control from device tree
+ * @hys_close: hysteresis control from device tree
+ * @is_gp2ap002s00f: this is the GP2AP002F variant of the chip
+ * @irq: the IRQ line used by this device
+ * @enabled: we cannot read the status of the hardware so we need to
+ * keep track of whether the event is enabled using this state variable
+ */
+struct gp2ap002 {
+	struct regmap *map;
+	struct device *dev;
+	struct regulator *vdd;
+	struct regulator *vio;
+	struct iio_channel *alsout;
+	u8 hys_far;
+	u8 hys_close;
+	bool is_gp2ap002s00f;
+	int irq;
+	bool enabled;
+};
+
+static irqreturn_t gp2ap002_prox_irq(int irq, void *d)
+{
+	struct iio_dev *indio_dev = d;
+	struct gp2ap002 *gp2ap002 = iio_priv(indio_dev);
+	u64 ev;
+	int val;
+	int ret;
+
+	if (!gp2ap002->enabled)
+		goto err_retrig;
+
+	ret = regmap_read(gp2ap002->map, GP2AP002_PROX, &val);
+	if (ret) {
+		dev_err(gp2ap002->dev, "error reading proximity\n");
+		goto err_retrig;
+	}
+
+	if (val & GP2AP002_PROX_VO_DETECT) {
+		/* Close */
+		dev_dbg(gp2ap002->dev, "close\n");
+		ret = regmap_write(gp2ap002->map, GP2AP002_HYS,
+				   gp2ap002->hys_far);
+		if (ret)
+			dev_err(gp2ap002->dev,
+				"error setting up proximity hysteresis\n");
+		ev = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, GP2AP002_PROX_CHANNEL,
+					IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING);
+	} else {
+		/* Far */
+		dev_dbg(gp2ap002->dev, "far\n");
+		ret = regmap_write(gp2ap002->map, GP2AP002_HYS,
+				   gp2ap002->hys_close);
+		if (ret)
+			dev_err(gp2ap002->dev,
+				"error setting up proximity hysteresis\n");
+		ev = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, GP2AP002_PROX_CHANNEL,
+					IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING);
+	}
+	iio_push_event(indio_dev, ev, iio_get_time_ns(indio_dev));
+
+	/*
+	 * After changing hysteresis, we need to wait for one detection
+	 * cycle to see if anything changed, or we will just trigger the
+	 * previous interrupt again. A detection cycle depends on the CYCLE
+	 * register, we are hard-coding ~8 ms in probe() so wait some more
+	 * than this, 20-30 ms.
+	 */
+	usleep_range(20000, 30000);
+
+err_retrig:
+	ret = regmap_write(gp2ap002->map, GP2AP002_CON,
+			   GP2AP002_CON_OCON_ENABLE);
+	if (ret)
+		dev_err(gp2ap002->dev, "error setting up VOUT control\n");
+
+	return IRQ_HANDLED;
+}
+
+/*
+ * This array maps current and lux.
+ *
+ * Ambient light sensing range is 3 to 55000 lux.
+ *
+ * This mapping is based on the following formula.
+ * illuminance = 10 ^ (current[mA] / 10)
+ *
+ * When the ADC measures 0, return 0 lux.
+ */
+static const u16 gp2ap002_illuminance_table[] = {
+	0, 1, 1, 2, 2, 3, 4, 5, 6, 8, 10, 12, 16, 20, 25, 32, 40, 50, 63, 79,
+	100, 126, 158, 200, 251, 316, 398, 501, 631, 794, 1000, 1259, 1585,
+	1995, 2512, 3162, 3981, 5012, 6310, 7943, 10000, 12589, 15849, 19953,
+	25119, 31623, 39811, 50119,
+};
+
+static int gp2ap002_get_lux(struct gp2ap002 *gp2ap002)
+{
+	int ret, res;
+	u16 lux;
+
+	ret = iio_read_channel_processed(gp2ap002->alsout, &res);
+	if (ret < 0)
+		return ret;
+
+	dev_dbg(gp2ap002->dev, "read %d mA from ADC\n", res);
+
+	/* ensure we don't under/overflow */
+	res = clamp(res, 0, (int)ARRAY_SIZE(gp2ap002_illuminance_table) - 1);
+	lux = gp2ap002_illuminance_table[res];
+
+	return (int)lux;
+}
+
+static int gp2ap002_read_raw(struct iio_dev *indio_dev,
+			   struct iio_chan_spec const *chan,
+			   int *val, int *val2, long mask)
+{
+	struct gp2ap002 *gp2ap002 = iio_priv(indio_dev);
+	int ret;
+
+	pm_runtime_get_sync(gp2ap002->dev);
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		switch (chan->type) {
+		case IIO_LIGHT:
+			ret = gp2ap002_get_lux(gp2ap002);
+			if (ret < 0)
+				return ret;
+			*val = ret;
+			ret = IIO_VAL_INT;
+			goto out;
+		default:
+			ret = -EINVAL;
+			goto out;
+		}
+	default:
+		ret = -EINVAL;
+	}
+
+out:
+	pm_runtime_mark_last_busy(gp2ap002->dev);
+	pm_runtime_put_autosuspend(gp2ap002->dev);
+
+	return ret;
+}
+
+static int gp2ap002_init(struct gp2ap002 *gp2ap002)
+{
+	int ret;
+
+	/* Set up the IR LED resistance */
+	ret = regmap_write(gp2ap002->map, GP2AP002_GAIN,
+			   GP2AP002_GAIN_LED_NORMAL);
+	if (ret) {
+		dev_err(gp2ap002->dev, "error setting up LED gain\n");
+		return ret;
+	}
+	ret = regmap_write(gp2ap002->map, GP2AP002_HYS, gp2ap002->hys_far);
+	if (ret) {
+		dev_err(gp2ap002->dev,
+			"error setting up proximity hysteresis\n");
+		return ret;
+	}
+
+	/* Disable internal frequency hopping */
+	ret = regmap_write(gp2ap002->map, GP2AP002_CYCLE,
+			   GP2AP002_CYCLE_OSC_INEFFECTIVE);
+	if (ret) {
+		dev_err(gp2ap002->dev,
+			"error setting up internal frequency hopping\n");
+		return ret;
+	}
+
+	/* Enable chip and IRQ, disable analog sleep */
+	ret = regmap_write(gp2ap002->map, GP2AP002_OPMOD,
+			   GP2AP002_OPMOD_SSD_OPERATING |
+			   GP2AP002_OPMOD_VCON_IRQ);
+	if (ret) {
+		dev_err(gp2ap002->dev, "error setting up operation mode\n");
+		return ret;
+	}
+
+	/* Interrupt on VOUT enabled */
+	ret = regmap_write(gp2ap002->map, GP2AP002_CON,
+			   GP2AP002_CON_OCON_ENABLE);
+	if (ret)
+		dev_err(gp2ap002->dev, "error setting up VOUT control\n");
+
+	return ret;
+}
+
+static int gp2ap002_read_event_config(struct iio_dev *indio_dev,
+				      const struct iio_chan_spec *chan,
+				      enum iio_event_type type,
+				      enum iio_event_direction dir)
+{
+	struct gp2ap002 *gp2ap002 = iio_priv(indio_dev);
+
+	/*
+	 * We just keep track of this internally, as it is not possible to
+	 * query the hardware.
+	 */
+	return gp2ap002->enabled;
+}
+
+static int gp2ap002_write_event_config(struct iio_dev *indio_dev,
+				       const struct iio_chan_spec *chan,
+				       enum iio_event_type type,
+				       enum iio_event_direction dir,
+				       int state)
+{
+	struct gp2ap002 *gp2ap002 = iio_priv(indio_dev);
+
+	if (state) {
+		/*
+		 * This will bring the regulators up (unless they are on
+		 * already) and reintialize the sensor by using runtime_pm
+		 * callbacks.
+		 */
+		pm_runtime_get_sync(gp2ap002->dev);
+		gp2ap002->enabled = true;
+	} else {
+		pm_runtime_mark_last_busy(gp2ap002->dev);
+		pm_runtime_put_autosuspend(gp2ap002->dev);
+		gp2ap002->enabled = false;
+	}
+
+	return 0;
+}
+
+static const struct iio_info gp2ap002_info = {
+	.read_raw = gp2ap002_read_raw,
+	.read_event_config = gp2ap002_read_event_config,
+	.write_event_config = gp2ap002_write_event_config,
+};
+
+static const struct iio_event_spec gp2ap002_events[] = {
+	{
+		.type = IIO_EV_TYPE_THRESH,
+		.dir = IIO_EV_DIR_EITHER,
+		.mask_separate = BIT(IIO_EV_INFO_ENABLE),
+	},
+};
+
+static const struct iio_chan_spec gp2ap002_channels[] = {
+	{
+		.type = IIO_PROXIMITY,
+		.event_spec = gp2ap002_events,
+		.num_event_specs = ARRAY_SIZE(gp2ap002_events),
+	},
+	{
+		.type = IIO_LIGHT,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+		.channel = GP2AP002_ALS_CHANNEL,
+	},
+};
+
+/*
+ * We need a special regmap because this hardware expects to
+ * write single bytes to registers but read a 16bit word on some
+ * variants and discard the lower 8 bits so combine
+ * i2c_smbus_read_word_data() with i2c_smbus_write_byte_data()
+ * selectively like this.
+ */
+static int gp2ap002_regmap_i2c_read(void *context, unsigned int reg,
+				    unsigned int *val)
+{
+	struct device *dev = context;
+	struct i2c_client *i2c = to_i2c_client(dev);
+	int ret;
+
+	ret = i2c_smbus_read_word_data(i2c, reg);
+	if (ret < 0)
+		return ret;
+
+	*val = (ret >> 8) & 0xFF;
+
+	return 0;
+}
+
+static int gp2ap002_regmap_i2c_write(void *context, unsigned int reg,
+				     unsigned int val)
+{
+	struct device *dev = context;
+	struct i2c_client *i2c = to_i2c_client(dev);
+
+	return i2c_smbus_write_byte_data(i2c, reg, val);
+}
+
+static struct regmap_bus gp2ap002_regmap_bus = {
+	.reg_read = gp2ap002_regmap_i2c_read,
+	.reg_write = gp2ap002_regmap_i2c_write,
+};
+
+static int gp2ap002_probe(struct i2c_client *client)
+{
+	struct gp2ap002 *gp2ap002;
+	struct iio_dev *indio_dev;
+	struct device *dev = &client->dev;
+	enum iio_chan_type ch_type;
+	static const struct regmap_config config = {
+		.reg_bits = 8,
+		.val_bits = 8,
+		.max_register = GP2AP002_CON,
+	};
+	struct regmap *regmap;
+	int num_chan;
+	const char *compat;
+	u8 val;
+	int ret;
+
+	indio_dev = devm_iio_device_alloc(dev, sizeof(*gp2ap002));
+	if (!indio_dev)
+		return -ENOMEM;
+	i2c_set_clientdata(client, indio_dev);
+
+	gp2ap002 = iio_priv(indio_dev);
+	gp2ap002->dev = dev;
+
+	/*
+	 * Check the device compatible like this makes it possible to use
+	 * ACPI PRP0001 for registering the sensor using device tree
+	 * properties.
+	 */
+	ret = device_property_read_string(dev, "compatible", &compat);
+	if (ret) {
+		dev_err(dev, "cannot check compatible\n");
+		return ret;
+	}
+	gp2ap002->is_gp2ap002s00f = !strcmp(compat, "sharp,gp2ap002s00f");
+
+	regmap = devm_regmap_init(dev, &gp2ap002_regmap_bus, dev, &config);
+	if (IS_ERR(regmap)) {
+		dev_err(dev, "Failed to register i2c regmap %ld\n", PTR_ERR(regmap));
+		return PTR_ERR(regmap);
+	}
+	gp2ap002->map = regmap;
+
+	/*
+	 * The hysteresis settings are coded into the device tree as values
+	 * to be written into the hysteresis register. The datasheet defines
+	 * modes "A", "B1" and "B2" with fixed values to be use but vendor
+	 * code trees for actual devices are tweaking these values and refer to
+	 * modes named things like "B1.5". To be able to support any devices,
+	 * we allow passing an arbitrary hysteresis setting for "near" and
+	 * "far".
+	 */
+
+	/* Check the device tree for the IR LED hysteresis */
+	ret = device_property_read_u8(dev, "sharp,proximity-far-hysteresis",
+				      &val);
+	if (ret) {
+		dev_err(dev, "failed to obtain proximity far setting\n");
+		return ret;
+	}
+	dev_dbg(dev, "proximity far setting %02x\n", val);
+	gp2ap002->hys_far = val;
+
+	ret = device_property_read_u8(dev, "sharp,proximity-close-hysteresis",
+				      &val);
+	if (ret) {
+		dev_err(dev, "failed to obtain proximity close setting\n");
+		return ret;
+	}
+	dev_dbg(dev, "proximity close setting %02x\n", val);
+	gp2ap002->hys_close = val;
+
+	/* The GP2AP002A00F has a light sensor too */
+	if (!gp2ap002->is_gp2ap002s00f) {
+		gp2ap002->alsout = devm_iio_channel_get(dev, "alsout");
+		if (IS_ERR(gp2ap002->alsout)) {
+			ret = PTR_ERR(gp2ap002->alsout);
+			ret = (ret == -ENODEV) ? -EPROBE_DEFER : ret;
+			return dev_err_probe(dev, ret, "failed to get ALSOUT ADC channel\n");
+		}
+		ret = iio_get_channel_type(gp2ap002->alsout, &ch_type);
+		if (ret < 0)
+			return ret;
+		if (ch_type != IIO_CURRENT) {
+			dev_err(dev,
+				"wrong type of IIO channel specified for ALSOUT\n");
+			return -EINVAL;
+		}
+	}
+
+	gp2ap002->vdd = devm_regulator_get(dev, "vdd");
+	if (IS_ERR(gp2ap002->vdd))
+		return dev_err_probe(dev, PTR_ERR(gp2ap002->vdd),
+				     "failed to get VDD regulator\n");
+
+	gp2ap002->vio = devm_regulator_get(dev, "vio");
+	if (IS_ERR(gp2ap002->vio))
+		return dev_err_probe(dev, PTR_ERR(gp2ap002->vio),
+				     "failed to get VIO regulator\n");
+
+	/* Operating voltage 2.4V .. 3.6V according to datasheet */
+	ret = regulator_set_voltage(gp2ap002->vdd, 2400000, 3600000);
+	if (ret) {
+		dev_err(dev, "failed to sett VDD voltage\n");
+		return ret;
+	}
+
+	/* VIO should be between 1.65V and VDD */
+	ret = regulator_get_voltage(gp2ap002->vdd);
+	if (ret < 0) {
+		dev_err(dev, "failed to get VDD voltage\n");
+		return ret;
+	}
+	ret = regulator_set_voltage(gp2ap002->vio, 1650000, ret);
+	if (ret) {
+		dev_err(dev, "failed to set VIO voltage\n");
+		return ret;
+	}
+
+	ret = regulator_enable(gp2ap002->vdd);
+	if (ret) {
+		dev_err(dev, "failed to enable VDD regulator\n");
+		return ret;
+	}
+	ret = regulator_enable(gp2ap002->vio);
+	if (ret) {
+		dev_err(dev, "failed to enable VIO regulator\n");
+		goto out_disable_vdd;
+	}
+
+	msleep(20);
+
+	/*
+	 * Initialize the device and signal to runtime PM that now we are
+	 * definitely up and using power.
+	 */
+	ret = gp2ap002_init(gp2ap002);
+	if (ret) {
+		dev_err(dev, "initialization failed\n");
+		goto out_disable_vio;
+	}
+	pm_runtime_get_noresume(dev);
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
+	gp2ap002->enabled = false;
+
+	ret = devm_request_threaded_irq(dev, client->irq, NULL,
+					gp2ap002_prox_irq, IRQF_ONESHOT,
+					"gp2ap002", indio_dev);
+	if (ret) {
+		dev_err(dev, "unable to request IRQ\n");
+		goto out_put_pm;
+	}
+	gp2ap002->irq = client->irq;
+
+	/*
+	 * As the device takes 20 ms + regulator delay to come up with a fresh
+	 * measurement after power-on, do not shut it down unnecessarily.
+	 * Set autosuspend to a one second.
+	 */
+	pm_runtime_set_autosuspend_delay(dev, 1000);
+	pm_runtime_use_autosuspend(dev);
+	pm_runtime_put(dev);
+
+	indio_dev->info = &gp2ap002_info;
+	indio_dev->name = "gp2ap002";
+	indio_dev->channels = gp2ap002_channels;
+	/* Skip light channel for the proximity-only sensor */
+	num_chan = ARRAY_SIZE(gp2ap002_channels);
+	if (gp2ap002->is_gp2ap002s00f)
+		num_chan--;
+	indio_dev->num_channels = num_chan;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+
+	ret = iio_device_register(indio_dev);
+	if (ret)
+		goto out_disable_pm;
+	dev_dbg(dev, "Sharp GP2AP002 probed successfully\n");
+
+	return 0;
+
+out_put_pm:
+	pm_runtime_put_noidle(dev);
+out_disable_pm:
+	pm_runtime_disable(dev);
+out_disable_vio:
+	regulator_disable(gp2ap002->vio);
+out_disable_vdd:
+	regulator_disable(gp2ap002->vdd);
+	return ret;
+}
+
+static void gp2ap002_remove(struct i2c_client *client)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(client);
+	struct gp2ap002 *gp2ap002 = iio_priv(indio_dev);
+	struct device *dev = &client->dev;
+
+	pm_runtime_get_sync(dev);
+	pm_runtime_put_noidle(dev);
+	pm_runtime_disable(dev);
+	iio_device_unregister(indio_dev);
+	regulator_disable(gp2ap002->vio);
+	regulator_disable(gp2ap002->vdd);
+}
+
+static int gp2ap002_runtime_suspend(struct device *dev)
+{
+	struct iio_dev *indio_dev = dev_get_drvdata(dev);
+	struct gp2ap002 *gp2ap002 = iio_priv(indio_dev);
+	int ret;
+
+	/* Deactivate the IRQ */
+	disable_irq(gp2ap002->irq);
+
+	/* Disable chip and IRQ, everything off */
+	ret = regmap_write(gp2ap002->map, GP2AP002_OPMOD, 0x00);
+	if (ret) {
+		dev_err(gp2ap002->dev, "error setting up operation mode\n");
+		return ret;
+	}
+	/*
+	 * As these regulators may be shared, at least we are now in
+	 * sleep even if the regulators aren't really turned off.
+	 */
+	regulator_disable(gp2ap002->vio);
+	regulator_disable(gp2ap002->vdd);
+
+	return 0;
+}
+
+static int gp2ap002_runtime_resume(struct device *dev)
+{
+	struct iio_dev *indio_dev = dev_get_drvdata(dev);
+	struct gp2ap002 *gp2ap002 = iio_priv(indio_dev);
+	int ret;
+
+	ret = regulator_enable(gp2ap002->vdd);
+	if (ret) {
+		dev_err(dev, "failed to enable VDD regulator in resume path\n");
+		return ret;
+	}
+	ret = regulator_enable(gp2ap002->vio);
+	if (ret) {
+		dev_err(dev, "failed to enable VIO regulator in resume path\n");
+		return ret;
+	}
+
+	msleep(20);
+
+	ret = gp2ap002_init(gp2ap002);
+	if (ret) {
+		dev_err(dev, "re-initialization failed\n");
+		return ret;
+	}
+
+	/* Re-activate the IRQ */
+	enable_irq(gp2ap002->irq);
+
+	return 0;
+}
+
+static DEFINE_RUNTIME_DEV_PM_OPS(gp2ap002_dev_pm_ops, gp2ap002_runtime_suspend,
+				 gp2ap002_runtime_resume, NULL);
+
+static const struct i2c_device_id gp2ap002_id_table[] = {
+	{ "gp2ap002", 0 },
+	{ },
+};
+MODULE_DEVICE_TABLE(i2c, gp2ap002_id_table);
+
+static const struct of_device_id gp2ap002_of_match[] = {
+	{ .compatible = "sharp,gp2ap002a00f" },
+	{ .compatible = "sharp,gp2ap002s00f" },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, gp2ap002_of_match);
+
+static struct i2c_driver gp2ap002_driver = {
+	.driver = {
+		.name = "gp2ap002",
+		.of_match_table = gp2ap002_of_match,
+		.pm = pm_ptr(&gp2ap002_dev_pm_ops),
+	},
+	.probe = gp2ap002_probe,
+	.remove = gp2ap002_remove,
+	.id_table = gp2ap002_id_table,
+};
+module_i2c_driver(gp2ap002_driver);
+
+MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
+MODULE_DESCRIPTION("GP2AP002 ambient light and proximity sensor driver");
+MODULE_LICENSE("GPL v2");