[mirror_ubuntu-bionic-kernel.git] / drivers / iio / accel / mma9551.c

/*
 * Freescale MMA9551L Intelligent Motion-Sensing Platform driver
 * Copyright (c) 2014, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 */

#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/acpi.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/events.h>
#include <linux/pm_runtime.h>
#include "mma9551_core.h"

#define MMA9551_DRV_NAME		"mma9551"
#define MMA9551_IRQ_NAME		"mma9551_event"
#define MMA9551_GPIO_COUNT		4

/* Tilt application (inclination in IIO terms). */
#define MMA9551_TILT_XZ_ANG_REG		0x00
#define MMA9551_TILT_YZ_ANG_REG		0x01
#define MMA9551_TILT_XY_ANG_REG		0x02
#define MMA9551_TILT_ANGFLG		BIT(7)
#define MMA9551_TILT_QUAD_REG		0x03
#define MMA9551_TILT_XY_QUAD_SHIFT	0
#define MMA9551_TILT_YZ_QUAD_SHIFT	2
#define MMA9551_TILT_XZ_QUAD_SHIFT	4
#define MMA9551_TILT_CFG_REG		0x01
#define MMA9551_TILT_ANG_THRESH_MASK	GENMASK(3, 0)

#define MMA9551_DEFAULT_SAMPLE_RATE	122	/* Hz */

/* Tilt events are mapped to the first three GPIO pins. */
enum mma9551_tilt_axis {
	mma9551_x = 0,
	mma9551_y,
	mma9551_z,
};

struct mma9551_data {
	struct i2c_client *client;
	struct mutex mutex;
	int event_enabled[3];
	int irqs[MMA9551_GPIO_COUNT];
};

static int mma9551_read_incli_chan(struct i2c_client *client,
				   const struct iio_chan_spec *chan,
				   int *val)
{
	u8 quad_shift, angle, quadrant;
	u16 reg_addr;
	int ret;

	switch (chan->channel2) {
	case IIO_MOD_X:
		reg_addr = MMA9551_TILT_YZ_ANG_REG;
		quad_shift = MMA9551_TILT_YZ_QUAD_SHIFT;
		break;
	case IIO_MOD_Y:
		reg_addr = MMA9551_TILT_XZ_ANG_REG;
		quad_shift = MMA9551_TILT_XZ_QUAD_SHIFT;
		break;
	case IIO_MOD_Z:
		reg_addr = MMA9551_TILT_XY_ANG_REG;
		quad_shift = MMA9551_TILT_XY_QUAD_SHIFT;
		break;
	default:
		return -EINVAL;
	}

	ret = mma9551_set_power_state(client, true);
	if (ret < 0)
		return ret;

	ret = mma9551_read_status_byte(client, MMA9551_APPID_TILT,
				       reg_addr, &angle);
	if (ret < 0)
		goto out_poweroff;

	ret = mma9551_read_status_byte(client, MMA9551_APPID_TILT,
				       MMA9551_TILT_QUAD_REG, &quadrant);
	if (ret < 0)
		goto out_poweroff;

	angle &= ~MMA9551_TILT_ANGFLG;
	quadrant = (quadrant >> quad_shift) & 0x03;

	if (quadrant == 1 || quadrant == 3)
		*val = 90 * (quadrant + 1) - angle;
	else
		*val = angle + 90 * quadrant;

	ret = IIO_VAL_INT;

out_poweroff:
	mma9551_set_power_state(client, false);
	return ret;
}

static int mma9551_read_raw(struct iio_dev *indio_dev,
			    struct iio_chan_spec const *chan,
			    int *val, int *val2, long mask)
{
	struct mma9551_data *data = iio_priv(indio_dev);
	int ret;

	switch (mask) {
	case IIO_CHAN_INFO_PROCESSED:
		switch (chan->type) {
		case IIO_INCLI:
			mutex_lock(&data->mutex);
			ret = mma9551_read_incli_chan(data->client, chan, val);
			mutex_unlock(&data->mutex);
			return ret;
		default:
			return -EINVAL;
		}
	case IIO_CHAN_INFO_RAW:
		switch (chan->type) {
		case IIO_ACCEL:
			mutex_lock(&data->mutex);
			ret = mma9551_read_accel_chan(data->client,
						      chan, val, val2);
			mutex_unlock(&data->mutex);
			return ret;
		default:
			return -EINVAL;
		}
	case IIO_CHAN_INFO_SCALE:
		switch (chan->type) {
		case IIO_ACCEL:
			return mma9551_read_accel_scale(val, val2);
		default:
			return -EINVAL;
		}
	default:
		return -EINVAL;
	}
}

static int mma9551_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 mma9551_data *data = iio_priv(indio_dev);

	switch (chan->type) {
	case IIO_INCLI:
		/* IIO counts axes from 1, because IIO_NO_MOD is 0. */
		return data->event_enabled[chan->channel2 - 1];
	default:
		return -EINVAL;
	}
}

static int mma9551_config_incli_event(struct iio_dev *indio_dev,
				      enum iio_modifier axis,
				      int state)
{
	struct mma9551_data *data = iio_priv(indio_dev);
	enum mma9551_tilt_axis mma_axis;
	int ret;

	/* IIO counts axes from 1, because IIO_NO_MOD is 0. */
	mma_axis = axis - 1;

	if (data->event_enabled[mma_axis] == state)
		return 0;

	if (state == 0) {
		ret = mma9551_gpio_config(data->client,
					  (enum mma9551_gpio_pin)mma_axis,
					  MMA9551_APPID_NONE, 0, 0);
		if (ret < 0)
			return ret;

		ret = mma9551_set_power_state(data->client, false);
		if (ret < 0)
			return ret;
	} else {
		int bitnum;

		/* Bit 7 of each angle register holds the angle flag. */
		switch (axis) {
		case IIO_MOD_X:
			bitnum = 7 + 8 * MMA9551_TILT_YZ_ANG_REG;
			break;
		case IIO_MOD_Y:
			bitnum = 7 + 8 * MMA9551_TILT_XZ_ANG_REG;
			break;
		case IIO_MOD_Z:
			bitnum = 7 + 8 * MMA9551_TILT_XY_ANG_REG;
			break;
		default:
			return -EINVAL;
		}


		ret = mma9551_set_power_state(data->client, true);
		if (ret < 0)
			return ret;

		ret = mma9551_gpio_config(data->client,
					  (enum mma9551_gpio_pin)mma_axis,
					  MMA9551_APPID_TILT, bitnum, 0);
		if (ret < 0) {
			mma9551_set_power_state(data->client, false);
			return ret;
		}
	}

	data->event_enabled[mma_axis] = state;

	return ret;
}

static int mma9551_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 mma9551_data *data = iio_priv(indio_dev);
	int ret;

	switch (chan->type) {
	case IIO_INCLI:
		mutex_lock(&data->mutex);
		ret = mma9551_config_incli_event(indio_dev,
						 chan->channel2, state);
		mutex_unlock(&data->mutex);
		return ret;
	default:
		return -EINVAL;
	}
}

static int mma9551_write_event_value(struct iio_dev *indio_dev,
				     const struct iio_chan_spec *chan,
				     enum iio_event_type type,
				     enum iio_event_direction dir,
				     enum iio_event_info info,
				     int val, int val2)
{
	struct mma9551_data *data = iio_priv(indio_dev);
	int ret;

	switch (chan->type) {
	case IIO_INCLI:
		if (val2 != 0 || val < 1 || val > 10)
			return -EINVAL;
		mutex_lock(&data->mutex);
		ret = mma9551_update_config_bits(data->client,
						 MMA9551_APPID_TILT,
						 MMA9551_TILT_CFG_REG,
						 MMA9551_TILT_ANG_THRESH_MASK,
						 val);
		mutex_unlock(&data->mutex);
		return ret;
	default:
		return -EINVAL;
	}
}

static int mma9551_read_event_value(struct iio_dev *indio_dev,
				    const struct iio_chan_spec *chan,
				    enum iio_event_type type,
				    enum iio_event_direction dir,
				    enum iio_event_info info,
				    int *val, int *val2)
{
	struct mma9551_data *data = iio_priv(indio_dev);
	int ret;
	u8 tmp;

	switch (chan->type) {
	case IIO_INCLI:
		mutex_lock(&data->mutex);
		ret = mma9551_read_config_byte(data->client,
					       MMA9551_APPID_TILT,
					       MMA9551_TILT_CFG_REG, &tmp);
		mutex_unlock(&data->mutex);
		if (ret < 0)
			return ret;
		*val = tmp & MMA9551_TILT_ANG_THRESH_MASK;
		*val2 = 0;
		return IIO_VAL_INT;
	default:
		return -EINVAL;
	}
}

static const struct iio_event_spec mma9551_incli_event = {
	.type = IIO_EV_TYPE_ROC,
	.dir = IIO_EV_DIR_RISING,
	.mask_separate = BIT(IIO_EV_INFO_ENABLE),
	.mask_shared_by_type = BIT(IIO_EV_INFO_VALUE),
};

#define MMA9551_INCLI_CHANNEL(axis) {				\
	.type = IIO_INCLI,					\
	.modified = 1,						\
	.channel2 = axis,					\
	.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),	\
	.event_spec = &mma9551_incli_event,			\
	.num_event_specs = 1,					\
}

static const struct iio_chan_spec mma9551_channels[] = {
	MMA9551_ACCEL_CHANNEL(IIO_MOD_X),
	MMA9551_ACCEL_CHANNEL(IIO_MOD_Y),
	MMA9551_ACCEL_CHANNEL(IIO_MOD_Z),

	MMA9551_INCLI_CHANNEL(IIO_MOD_X),
	MMA9551_INCLI_CHANNEL(IIO_MOD_Y),
	MMA9551_INCLI_CHANNEL(IIO_MOD_Z),
};

static const struct iio_info mma9551_info = {
	.read_raw = mma9551_read_raw,
	.read_event_config = mma9551_read_event_config,
	.write_event_config = mma9551_write_event_config,
	.read_event_value = mma9551_read_event_value,
	.write_event_value = mma9551_write_event_value,
};

static irqreturn_t mma9551_event_handler(int irq, void *private)
{
	struct iio_dev *indio_dev = private;
	struct mma9551_data *data = iio_priv(indio_dev);
	int i, ret, mma_axis = -1;
	u16 reg;
	u8 val;

	mutex_lock(&data->mutex);

	for (i = 0; i < 3; i++)
		if (irq == data->irqs[i]) {
			mma_axis = i;
			break;
		}

	if (mma_axis == -1) {
		/* IRQ was triggered on 4th line, which we don't use. */
		dev_warn(&data->client->dev,
			 "irq triggered on unused line %d\n", data->irqs[3]);
		goto out;
	}

	switch (mma_axis) {
	case mma9551_x:
		reg = MMA9551_TILT_YZ_ANG_REG;
		break;
	case mma9551_y:
		reg = MMA9551_TILT_XZ_ANG_REG;
		break;
	case mma9551_z:
		reg = MMA9551_TILT_XY_ANG_REG;
		break;
	}

	/*
	 * Read the angle even though we don't use it, otherwise we
	 * won't get any further interrupts.
	 */
	ret = mma9551_read_status_byte(data->client, MMA9551_APPID_TILT,
				       reg, &val);
	if (ret < 0) {
		dev_err(&data->client->dev,
			"error %d reading tilt register in IRQ\n", ret);
		goto out;
	}

	iio_push_event(indio_dev,
		       IIO_MOD_EVENT_CODE(IIO_INCLI, 0, (mma_axis + 1),
					  IIO_EV_TYPE_ROC, IIO_EV_DIR_RISING),
		       iio_get_time_ns(indio_dev));

out:
	mutex_unlock(&data->mutex);

	return IRQ_HANDLED;
}

static int mma9551_init(struct mma9551_data *data)
{
	int ret;

	ret = mma9551_read_version(data->client);
	if (ret)
		return ret;

	return mma9551_set_device_state(data->client, true);
}

static int mma9551_gpio_probe(struct iio_dev *indio_dev)
{
	struct gpio_desc *gpio;
	int i, ret;
	struct mma9551_data *data = iio_priv(indio_dev);
	struct device *dev = &data->client->dev;

	for (i = 0; i < MMA9551_GPIO_COUNT; i++) {
		gpio = devm_gpiod_get_index(dev, NULL, i, GPIOD_IN);
		if (IS_ERR(gpio)) {
			dev_err(dev, "acpi gpio get index failed\n");
			return PTR_ERR(gpio);
		}

		ret = gpiod_to_irq(gpio);
		if (ret < 0)
			return ret;

		data->irqs[i] = ret;
		ret = devm_request_threaded_irq(dev, data->irqs[i],
				NULL, mma9551_event_handler,
				IRQF_TRIGGER_RISING | IRQF_ONESHOT,
				MMA9551_IRQ_NAME, indio_dev);
		if (ret < 0) {
			dev_err(dev, "request irq %d failed\n", data->irqs[i]);
			return ret;
		}

		dev_dbg(dev, "gpio resource, no:%d irq:%d\n",
			desc_to_gpio(gpio), data->irqs[i]);
	}

	return 0;
}

static const char *mma9551_match_acpi_device(struct device *dev)
{
	const struct acpi_device_id *id;

	id = acpi_match_device(dev->driver->acpi_match_table, dev);
	if (!id)
		return NULL;

	return dev_name(dev);
}

static int mma9551_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	struct mma9551_data *data;
	struct iio_dev *indio_dev;
	const char *name = NULL;
	int ret;

	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
	if (!indio_dev)
		return -ENOMEM;

	data = iio_priv(indio_dev);
	i2c_set_clientdata(client, indio_dev);
	data->client = client;

	if (id)
		name = id->name;
	else if (ACPI_HANDLE(&client->dev))
		name = mma9551_match_acpi_device(&client->dev);

	ret = mma9551_init(data);
	if (ret < 0)
		return ret;

	mutex_init(&data->mutex);

	indio_dev->dev.parent = &client->dev;
	indio_dev->channels = mma9551_channels;
	indio_dev->num_channels = ARRAY_SIZE(mma9551_channels);
	indio_dev->name = name;
	indio_dev->modes = INDIO_DIRECT_MODE;
	indio_dev->info = &mma9551_info;

	ret = mma9551_gpio_probe(indio_dev);
	if (ret < 0)
		goto out_poweroff;

	ret = pm_runtime_set_active(&client->dev);
	if (ret < 0)
		goto out_poweroff;

	pm_runtime_enable(&client->dev);
	pm_runtime_set_autosuspend_delay(&client->dev,
					 MMA9551_AUTO_SUSPEND_DELAY_MS);
	pm_runtime_use_autosuspend(&client->dev);

	ret = iio_device_register(indio_dev);
	if (ret < 0) {
		dev_err(&client->dev, "unable to register iio device\n");
		goto out_poweroff;
	}

	return 0;

out_poweroff:
	mma9551_set_device_state(client, false);

	return ret;
}

static int mma9551_remove(struct i2c_client *client)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(client);
	struct mma9551_data *data = iio_priv(indio_dev);

	iio_device_unregister(indio_dev);

	pm_runtime_disable(&client->dev);
	pm_runtime_set_suspended(&client->dev);
	pm_runtime_put_noidle(&client->dev);

	mutex_lock(&data->mutex);
	mma9551_set_device_state(data->client, false);
	mutex_unlock(&data->mutex);

	return 0;
}

#ifdef CONFIG_PM
static int mma9551_runtime_suspend(struct device *dev)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
	struct mma9551_data *data = iio_priv(indio_dev);
	int ret;

	mutex_lock(&data->mutex);
	ret = mma9551_set_device_state(data->client, false);
	mutex_unlock(&data->mutex);
	if (ret < 0) {
		dev_err(&data->client->dev, "powering off device failed\n");
		return -EAGAIN;
	}

	return 0;
}

static int mma9551_runtime_resume(struct device *dev)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
	struct mma9551_data *data = iio_priv(indio_dev);
	int ret;

	ret = mma9551_set_device_state(data->client, true);
	if (ret < 0)
		return ret;

	mma9551_sleep(MMA9551_DEFAULT_SAMPLE_RATE);

	return 0;
}
#endif

#ifdef CONFIG_PM_SLEEP
static int mma9551_suspend(struct device *dev)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
	struct mma9551_data *data = iio_priv(indio_dev);
	int ret;

	mutex_lock(&data->mutex);
	ret = mma9551_set_device_state(data->client, false);
	mutex_unlock(&data->mutex);

	return ret;
}

static int mma9551_resume(struct device *dev)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
	struct mma9551_data *data = iio_priv(indio_dev);
	int ret;

	mutex_lock(&data->mutex);
	ret = mma9551_set_device_state(data->client, true);
	mutex_unlock(&data->mutex);

	return ret;
}
#endif

static const struct dev_pm_ops mma9551_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(mma9551_suspend, mma9551_resume)
	SET_RUNTIME_PM_OPS(mma9551_runtime_suspend,
			   mma9551_runtime_resume, NULL)
};

static const struct acpi_device_id mma9551_acpi_match[] = {
	{"MMA9551", 0},
	{},
};

MODULE_DEVICE_TABLE(acpi, mma9551_acpi_match);

static const struct i2c_device_id mma9551_id[] = {
	{"mma9551", 0},
	{}
};

MODULE_DEVICE_TABLE(i2c, mma9551_id);

static struct i2c_driver mma9551_driver = {
	.driver = {
		   .name = MMA9551_DRV_NAME,
		   .acpi_match_table = ACPI_PTR(mma9551_acpi_match),
		   .pm = &mma9551_pm_ops,
		   },
	.probe = mma9551_probe,
	.remove = mma9551_remove,
	.id_table = mma9551_id,
};

module_i2c_driver(mma9551_driver);

MODULE_AUTHOR("Irina Tirdea <irina.tirdea@intel.com>");
MODULE_AUTHOR("Vlad Dogaru <vlad.dogaru@intel.com>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("MMA9551L motion-sensing platform driver");
Commit	Line	Data
c78b9171 VD	1	/*
	2	* Freescale MMA9551L Intelligent Motion-Sensing Platform driver
	3	* Copyright (c) 2014, Intel Corporation.
	4	*
	5	* This program is free software; you can redistribute it and/or modify it
	6	* under the terms and conditions of the GNU General Public License,
	7	* version 2, as published by the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope it will be useful, but WITHOUT
	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	12	* more details.
	13	*/
	14
	15	#include <linux/module.h>
	16	#include <linux/i2c.h>
	17	#include <linux/interrupt.h>
	18	#include <linux/slab.h>
	19	#include <linux/acpi.h>
	20	#include <linux/delay.h>
	21	#include <linux/gpio/consumer.h>
	22	#include <linux/iio/iio.h>
	23	#include <linux/iio/sysfs.h>
	24	#include <linux/iio/events.h>
6da93a67	25	#include <linux/pm_runtime.h>
d5b97f5c	26	#include "mma9551_core.h"
c78b9171 VD	27
	28	#define MMA9551_DRV_NAME "mma9551"
	29	#define MMA9551_IRQ_NAME "mma9551_event"
c78b9171 VD	30	#define MMA9551_GPIO_COUNT 4
c78b9171 VD	31
c78b9171 VD	32	/* Tilt application (inclination in IIO terms). */
	33	#define MMA9551_TILT_XZ_ANG_REG 0x00
	34	#define MMA9551_TILT_YZ_ANG_REG 0x01
	35	#define MMA9551_TILT_XY_ANG_REG 0x02
	36	#define MMA9551_TILT_ANGFLG BIT(7)
	37	#define MMA9551_TILT_QUAD_REG 0x03
	38	#define MMA9551_TILT_XY_QUAD_SHIFT 0
	39	#define MMA9551_TILT_YZ_QUAD_SHIFT 2
	40	#define MMA9551_TILT_XZ_QUAD_SHIFT 4
	41	#define MMA9551_TILT_CFG_REG 0x01
	42	#define MMA9551_TILT_ANG_THRESH_MASK GENMASK(3, 0)
	43
d5b97f5c IT	44	#define MMA9551_DEFAULT_SAMPLE_RATE 122 /* Hz */
d5b97f5c IT	45
c78b9171 VD	46	/* Tilt events are mapped to the first three GPIO pins. */
	47	enum mma9551_tilt_axis {
	48	mma9551_x = 0,
	49	mma9551_y,
	50	mma9551_z,
	51	};
	52
c78b9171 VD	53	struct mma9551_data {
	54	struct i2c_client *client;
	55	struct mutex mutex;
	56	int event_enabled[3];
	57	int irqs[MMA9551_GPIO_COUNT];
	58	};
	59
c78b9171 VD	60	static int mma9551_read_incli_chan(struct i2c_client *client,
	61	const struct iio_chan_spec *chan,
	62	int *val)
	63	{
	64	u8 quad_shift, angle, quadrant;
	65	u16 reg_addr;
	66	int ret;
	67
	68	switch (chan->channel2) {
	69	case IIO_MOD_X:
	70	reg_addr = MMA9551_TILT_YZ_ANG_REG;
	71	quad_shift = MMA9551_TILT_YZ_QUAD_SHIFT;
	72	break;
	73	case IIO_MOD_Y:
	74	reg_addr = MMA9551_TILT_XZ_ANG_REG;
	75	quad_shift = MMA9551_TILT_XZ_QUAD_SHIFT;
	76	break;
	77	case IIO_MOD_Z:
	78	reg_addr = MMA9551_TILT_XY_ANG_REG;
	79	quad_shift = MMA9551_TILT_XY_QUAD_SHIFT;
	80	break;
	81	default:
	82	return -EINVAL;
	83	}
	84
6da93a67 IT	85	ret = mma9551_set_power_state(client, true);
	86	if (ret < 0)
	87	return ret;
	88
c78b9171 VD	89	ret = mma9551_read_status_byte(client, MMA9551_APPID_TILT,
	90	reg_addr, &angle);
	91	if (ret < 0)
6da93a67	92	goto out_poweroff;
c78b9171 VD	93
	94	ret = mma9551_read_status_byte(client, MMA9551_APPID_TILT,
	95	MMA9551_TILT_QUAD_REG, &quadrant);
	96	if (ret < 0)
6da93a67	97	goto out_poweroff;
c78b9171 VD	98
	99	angle &= ~MMA9551_TILT_ANGFLG;
	100	quadrant = (quadrant >> quad_shift) & 0x03;
	101
	102	if (quadrant == 1 \|\| quadrant == 3)
	103	val = 90 (quadrant + 1) - angle;
	104	else
	105	val = angle + 90 quadrant;
	106
6da93a67 IT	107	ret = IIO_VAL_INT;
	108
	109	out_poweroff:
	110	mma9551_set_power_state(client, false);
	111	return ret;
c78b9171 VD	112	}
c78b9171 VD	113
c78b9171 VD	114	static int mma9551_read_raw(struct iio_dev *indio_dev,
	115	struct iio_chan_spec const *chan,
	116	int val, int val2, long mask)
	117	{
	118	struct mma9551_data *data = iio_priv(indio_dev);
	119	int ret;
	120
	121	switch (mask) {
	122	case IIO_CHAN_INFO_PROCESSED:
	123	switch (chan->type) {
	124	case IIO_INCLI:
	125	mutex_lock(&data->mutex);
	126	ret = mma9551_read_incli_chan(data->client, chan, val);
	127	mutex_unlock(&data->mutex);
	128	return ret;
	129	default:
	130	return -EINVAL;
	131	}
	132	case IIO_CHAN_INFO_RAW:
	133	switch (chan->type) {
	134	case IIO_ACCEL:
	135	mutex_lock(&data->mutex);
	136	ret = mma9551_read_accel_chan(data->client,
	137	chan, val, val2);
	138	mutex_unlock(&data->mutex);
	139	return ret;
	140	default:
	141	return -EINVAL;
	142	}
	143	case IIO_CHAN_INFO_SCALE:
	144	switch (chan->type) {
	145	case IIO_ACCEL:
d5b97f5c	146	return mma9551_read_accel_scale(val, val2);
c78b9171 VD	147	default:
	148	return -EINVAL;
	149	}
	150	default:
	151	return -EINVAL;
	152	}
	153	}
	154
	155	static int mma9551_read_event_config(struct iio_dev *indio_dev,
	156	const struct iio_chan_spec *chan,
	157	enum iio_event_type type,
	158	enum iio_event_direction dir)
	159	{
	160	struct mma9551_data *data = iio_priv(indio_dev);
	161
	162	switch (chan->type) {
	163	case IIO_INCLI:
	164	/* IIO counts axes from 1, because IIO_NO_MOD is 0. */
	165	return data->event_enabled[chan->channel2 - 1];
	166	default:
	167	return -EINVAL;
	168	}
	169	}
	170
	171	static int mma9551_config_incli_event(struct iio_dev *indio_dev,
	172	enum iio_modifier axis,
	173	int state)
	174	{
	175	struct mma9551_data *data = iio_priv(indio_dev);
	176	enum mma9551_tilt_axis mma_axis;
	177	int ret;
	178
	179	/* IIO counts axes from 1, because IIO_NO_MOD is 0. */
	180	mma_axis = axis - 1;
	181
	182	if (data->event_enabled[mma_axis] == state)
	183	return 0;
	184
	185	if (state == 0) {
60347e71 VD	186	ret = mma9551_gpio_config(data->client,
60347e71 VD	187	(enum mma9551_gpio_pin)mma_axis,
c78b9171 VD	188	MMA9551_APPID_NONE, 0, 0);
	189	if (ret < 0)
	190	return ret;
6da93a67 IT	191
	192	ret = mma9551_set_power_state(data->client, false);
	193	if (ret < 0)
	194	return ret;
c78b9171 VD	195	} else {
	196	int bitnum;
	197
	198	/* Bit 7 of each angle register holds the angle flag. */
	199	switch (axis) {
	200	case IIO_MOD_X:
	201	bitnum = 7 + 8 * MMA9551_TILT_YZ_ANG_REG;
	202	break;
	203	case IIO_MOD_Y:
	204	bitnum = 7 + 8 * MMA9551_TILT_XZ_ANG_REG;
	205	break;
	206	case IIO_MOD_Z:
	207	bitnum = 7 + 8 * MMA9551_TILT_XY_ANG_REG;
	208	break;
	209	default:
	210	return -EINVAL;
	211	}
	212
6da93a67 IT	213
	214	ret = mma9551_set_power_state(data->client, true);
	215	if (ret < 0)
	216	return ret;
	217
60347e71 VD	218	ret = mma9551_gpio_config(data->client,
60347e71 VD	219	(enum mma9551_gpio_pin)mma_axis,
c78b9171	220	MMA9551_APPID_TILT, bitnum, 0);
6da93a67 IT	221	if (ret < 0) {
6da93a67 IT	222	mma9551_set_power_state(data->client, false);
c78b9171	223	return ret;
6da93a67	224	}
c78b9171 VD	225	}
	226
	227	data->event_enabled[mma_axis] = state;
	228
	229	return ret;
	230	}
	231
	232	static int mma9551_write_event_config(struct iio_dev *indio_dev,
	233	const struct iio_chan_spec *chan,
	234	enum iio_event_type type,
	235	enum iio_event_direction dir,
	236	int state)
	237	{
	238	struct mma9551_data *data = iio_priv(indio_dev);
	239	int ret;
	240
	241	switch (chan->type) {
	242	case IIO_INCLI:
	243	mutex_lock(&data->mutex);
	244	ret = mma9551_config_incli_event(indio_dev,
	245	chan->channel2, state);
	246	mutex_unlock(&data->mutex);
	247	return ret;
	248	default:
	249	return -EINVAL;
	250	}
	251	}
	252
	253	static int mma9551_write_event_value(struct iio_dev *indio_dev,
	254	const struct iio_chan_spec *chan,
	255	enum iio_event_type type,
	256	enum iio_event_direction dir,
	257	enum iio_event_info info,
	258	int val, int val2)
	259	{
	260	struct mma9551_data *data = iio_priv(indio_dev);
	261	int ret;
	262
	263	switch (chan->type) {
	264	case IIO_INCLI:
	265	if (val2 != 0 \|\| val < 1 \|\| val > 10)
	266	return -EINVAL;
	267	mutex_lock(&data->mutex);
	268	ret = mma9551_update_config_bits(data->client,
	269	MMA9551_APPID_TILT,
	270	MMA9551_TILT_CFG_REG,
	271	MMA9551_TILT_ANG_THRESH_MASK,
	272	val);
	273	mutex_unlock(&data->mutex);
	274	return ret;
	275	default:
	276	return -EINVAL;
	277	}
	278	}
	279
	280	static int mma9551_read_event_value(struct iio_dev *indio_dev,
	281	const struct iio_chan_spec *chan,
	282	enum iio_event_type type,
	283	enum iio_event_direction dir,
	284	enum iio_event_info info,
	285	int val, int val2)
	286	{
	287	struct mma9551_data *data = iio_priv(indio_dev);
	288	int ret;
289	u8 tmp;
290
291	switch (chan->type) {
292	case IIO_INCLI:
293	mutex_lock(&data->mutex);
294	ret = mma9551_read_config_byte(data->client,
295	MMA9551_APPID_TILT,
296	MMA9551_TILT_CFG_REG, &tmp);
297	mutex_unlock(&data->mutex);
298	if (ret < 0)
299	return ret;
300	*val = tmp & MMA9551_TILT_ANG_THRESH_MASK;
301	*val2 = 0;
302	return IIO_VAL_INT;
303	default:
304	return -EINVAL;
305	}
306	}
307
308	static const struct iio_event_spec mma9551_incli_event = {
309	.type = IIO_EV_TYPE_ROC,
310	.dir = IIO_EV_DIR_RISING,
311	.mask_separate = BIT(IIO_EV_INFO_ENABLE),
312	.mask_shared_by_type = BIT(IIO_EV_INFO_VALUE),
313	};
314
c78b9171 VD	315	#define MMA9551_INCLI_CHANNEL(axis) { \
	316	.type = IIO_INCLI, \
	317	.modified = 1, \
	318	.channel2 = axis, \
	319	.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), \
	320	.event_spec = &mma9551_incli_event, \
	321	.num_event_specs = 1, \
	322	}
	323
	324	static const struct iio_chan_spec mma9551_channels[] = {
	325	MMA9551_ACCEL_CHANNEL(IIO_MOD_X),
	326	MMA9551_ACCEL_CHANNEL(IIO_MOD_Y),
	327	MMA9551_ACCEL_CHANNEL(IIO_MOD_Z),
	328
	329	MMA9551_INCLI_CHANNEL(IIO_MOD_X),
	330	MMA9551_INCLI_CHANNEL(IIO_MOD_Y),
	331	MMA9551_INCLI_CHANNEL(IIO_MOD_Z),
	332	};
	333
	334	static const struct iio_info mma9551_info = {
c78b9171 VD	335	.read_raw = mma9551_read_raw,
	336	.read_event_config = mma9551_read_event_config,
	337	.write_event_config = mma9551_write_event_config,
	338	.read_event_value = mma9551_read_event_value,
	339	.write_event_value = mma9551_write_event_value,
	340	};
	341
	342	static irqreturn_t mma9551_event_handler(int irq, void *private)
	343	{
	344	struct iio_dev *indio_dev = private;
	345	struct mma9551_data *data = iio_priv(indio_dev);
	346	int i, ret, mma_axis = -1;
	347	u16 reg;
	348	u8 val;
	349
	350	mutex_lock(&data->mutex);
	351
	352	for (i = 0; i < 3; i++)
	353	if (irq == data->irqs[i]) {
	354	mma_axis = i;
	355	break;
	356	}
	357
	358	if (mma_axis == -1) {
	359	/* IRQ was triggered on 4th line, which we don't use. */
	360	dev_warn(&data->client->dev,
	361	"irq triggered on unused line %d\n", data->irqs[3]);
	362	goto out;
	363	}
	364
	365	switch (mma_axis) {
	366	case mma9551_x:
	367	reg = MMA9551_TILT_YZ_ANG_REG;
	368	break;
	369	case mma9551_y:
	370	reg = MMA9551_TILT_XZ_ANG_REG;
	371	break;
	372	case mma9551_z:
	373	reg = MMA9551_TILT_XY_ANG_REG;
	374	break;
	375	}
	376
	377	/*
	378	* Read the angle even though we don't use it, otherwise we
	379	* won't get any further interrupts.
	380	*/
	381	ret = mma9551_read_status_byte(data->client, MMA9551_APPID_TILT,
	382	reg, &val);
	383	if (ret < 0) {
	384	dev_err(&data->client->dev,
	385	"error %d reading tilt register in IRQ\n", ret);
	386	goto out;
	387	}
	388
	389	iio_push_event(indio_dev,
	390	IIO_MOD_EVENT_CODE(IIO_INCLI, 0, (mma_axis + 1),
	391	IIO_EV_TYPE_ROC, IIO_EV_DIR_RISING),
bc2b7dab	392	iio_get_time_ns(indio_dev));
c78b9171 VD	393
	394	out:
	395	mutex_unlock(&data->mutex);
	396
	397	return IRQ_HANDLED;
	398	}
	399
	400	static int mma9551_init(struct mma9551_data *data)
	401	{
	402	int ret;
	403
	404	ret = mma9551_read_version(data->client);
	405	if (ret)
	406	return ret;
	407
6da93a67	408	return mma9551_set_device_state(data->client, true);
c78b9171 VD	409	}
	410
	411	static int mma9551_gpio_probe(struct iio_dev *indio_dev)
	412	{
	413	struct gpio_desc *gpio;
	414	int i, ret;
	415	struct mma9551_data *data = iio_priv(indio_dev);
	416	struct device *dev = &data->client->dev;
	417
	418	for (i = 0; i < MMA9551_GPIO_COUNT; i++) {
ed3edc09	419	gpio = devm_gpiod_get_index(dev, NULL, i, GPIOD_IN);
c78b9171 VD	420	if (IS_ERR(gpio)) {
	421	dev_err(dev, "acpi gpio get index failed\n");
	422	return PTR_ERR(gpio);
	423	}
	424
debf6d84 RD	425	ret = gpiod_to_irq(gpio);
	426	if (ret < 0)
	427	return ret;
	428
	429	data->irqs[i] = ret;
c78b9171 VD	430	ret = devm_request_threaded_irq(dev, data->irqs[i],
	431	NULL, mma9551_event_handler,
	432	IRQF_TRIGGER_RISING \| IRQF_ONESHOT,
	433	MMA9551_IRQ_NAME, indio_dev);
	434	if (ret < 0) {
	435	dev_err(dev, "request irq %d failed\n", data->irqs[i]);
	436	return ret;
	437	}
	438
	439	dev_dbg(dev, "gpio resource, no:%d irq:%d\n",
	440	desc_to_gpio(gpio), data->irqs[i]);
	441	}
	442
	443	return 0;
	444	}
	445
	446	static const char mma9551_match_acpi_device(struct device dev)
	447	{
	448	const struct acpi_device_id *id;
	449
	450	id = acpi_match_device(dev->driver->acpi_match_table, dev);
	451	if (!id)
	452	return NULL;
	453
	454	return dev_name(dev);
	455	}
	456
	457	static int mma9551_probe(struct i2c_client *client,
	458	const struct i2c_device_id *id)
	459	{
	460	struct mma9551_data *data;
	461	struct iio_dev *indio_dev;
	462	const char *name = NULL;
	463	int ret;
	464
	465	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
	466	if (!indio_dev)
	467	return -ENOMEM;
	468
	469	data = iio_priv(indio_dev);
	470	i2c_set_clientdata(client, indio_dev);
	471	data->client = client;
	472
	473	if (id)
	474	name = id->name;
	475	else if (ACPI_HANDLE(&client->dev))
	476	name = mma9551_match_acpi_device(&client->dev);
	477
	478	ret = mma9551_init(data);
	479	if (ret < 0)
	480	return ret;
	481
	482	mutex_init(&data->mutex);
	483
	484	indio_dev->dev.parent = &client->dev;
	485	indio_dev->channels = mma9551_channels;
	486	indio_dev->num_channels = ARRAY_SIZE(mma9551_channels);
	487	indio_dev->name = name;
	488	indio_dev->modes = INDIO_DIRECT_MODE;
	489	indio_dev->info = &mma9551_info;
	490
	491	ret = mma9551_gpio_probe(indio_dev);
	492	if (ret < 0)
	493	goto out_poweroff;
494
6da93a67 IT	495	ret = pm_runtime_set_active(&client->dev);
6da93a67 IT	496	if (ret < 0)
7d0ead5c	497	goto out_poweroff;
6da93a67 IT	498
	499	pm_runtime_enable(&client->dev);
	500	pm_runtime_set_autosuspend_delay(&client->dev,
	501	MMA9551_AUTO_SUSPEND_DELAY_MS);
	502	pm_runtime_use_autosuspend(&client->dev);
	503
7d0ead5c AR	504	ret = iio_device_register(indio_dev);
	505	if (ret < 0) {
	506	dev_err(&client->dev, "unable to register iio device\n");
	507	goto out_poweroff;
	508	}
	509
c78b9171 VD	510	return 0;
	511
	512	out_poweroff:
	513	mma9551_set_device_state(client, false);
	514
	515	return ret;
	516	}
	517
	518	static int mma9551_remove(struct i2c_client *client)
	519	{
	520	struct iio_dev *indio_dev = i2c_get_clientdata(client);
	521	struct mma9551_data *data = iio_priv(indio_dev);
	522
7d0ead5c AR	523	iio_device_unregister(indio_dev);
7d0ead5c AR	524
6da93a67 IT	525	pm_runtime_disable(&client->dev);
	526	pm_runtime_set_suspended(&client->dev);
	527	pm_runtime_put_noidle(&client->dev);
	528
c78b9171 VD	529	mutex_lock(&data->mutex);
	530	mma9551_set_device_state(data->client, false);
	531	mutex_unlock(&data->mutex);
	532
	533	return 0;
	534	}
	535
6da93a67 IT	536	#ifdef CONFIG_PM
	537	static int mma9551_runtime_suspend(struct device *dev)
	538	{
	539	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
	540	struct mma9551_data *data = iio_priv(indio_dev);
	541	int ret;
	542
	543	mutex_lock(&data->mutex);
	544	ret = mma9551_set_device_state(data->client, false);
	545	mutex_unlock(&data->mutex);
	546	if (ret < 0) {
	547	dev_err(&data->client->dev, "powering off device failed\n");
	548	return -EAGAIN;
	549	}
	550
	551	return 0;
	552	}
	553
	554	static int mma9551_runtime_resume(struct device *dev)
	555	{
	556	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
	557	struct mma9551_data *data = iio_priv(indio_dev);
	558	int ret;
	559
	560	ret = mma9551_set_device_state(data->client, true);
	561	if (ret < 0)
	562	return ret;
	563
	564	mma9551_sleep(MMA9551_DEFAULT_SAMPLE_RATE);
	565
	566	return 0;
	567	}
	568	#endif
	569
c78b9171 VD	570	#ifdef CONFIG_PM_SLEEP
	571	static int mma9551_suspend(struct device *dev)
	572	{
	573	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
	574	struct mma9551_data *data = iio_priv(indio_dev);
6da93a67	575	int ret;
c78b9171 VD	576
c78b9171 VD	577	mutex_lock(&data->mutex);
6da93a67	578	ret = mma9551_set_device_state(data->client, false);
c78b9171 VD	579	mutex_unlock(&data->mutex);
c78b9171 VD	580
6da93a67	581	return ret;
c78b9171 VD	582	}
	583
	584	static int mma9551_resume(struct device *dev)
	585	{
	586	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
	587	struct mma9551_data *data = iio_priv(indio_dev);
6da93a67	588	int ret;
c78b9171 VD	589
c78b9171 VD	590	mutex_lock(&data->mutex);
6da93a67	591	ret = mma9551_set_device_state(data->client, true);
c78b9171 VD	592	mutex_unlock(&data->mutex);
c78b9171 VD	593
6da93a67	594	return ret;
c78b9171	595	}
c78b9171 VD	596	#endif
	597
	598	static const struct dev_pm_ops mma9551_pm_ops = {
	599	SET_SYSTEM_SLEEP_PM_OPS(mma9551_suspend, mma9551_resume)
6da93a67 IT	600	SET_RUNTIME_PM_OPS(mma9551_runtime_suspend,
6da93a67 IT	601	mma9551_runtime_resume, NULL)
c78b9171 VD	602	};
	603
	604	static const struct acpi_device_id mma9551_acpi_match[] = {
	605	{"MMA9551", 0},
	606	{},
	607	};
	608
	609	MODULE_DEVICE_TABLE(acpi, mma9551_acpi_match);
	610
	611	static const struct i2c_device_id mma9551_id[] = {
	612	{"mma9551", 0},
	613	{}
	614	};
	615
	616	MODULE_DEVICE_TABLE(i2c, mma9551_id);
	617
	618	static struct i2c_driver mma9551_driver = {
	619	.driver = {
	620	.name = MMA9551_DRV_NAME,
	621	.acpi_match_table = ACPI_PTR(mma9551_acpi_match),
	622	.pm = &mma9551_pm_ops,
	623	},
	624	.probe = mma9551_probe,
	625	.remove = mma9551_remove,
	626	.id_table = mma9551_id,
	627	};
	628
	629	module_i2c_driver(mma9551_driver);
	630
	631	MODULE_AUTHOR("Irina Tirdea <irina.tirdea@intel.com>");
	632	MODULE_AUTHOR("Vlad Dogaru <vlad.dogaru@intel.com>");
	633	MODULE_LICENSE("GPL v2");
	634	MODULE_DESCRIPTION("MMA9551L motion-sensing platform driver");