[deliverable/linux.git] / drivers / iio / accel / stk8312.c

/**
 * Sensortek STK8312 3-Axis Accelerometer
 *
 * Copyright (c) 2015, Intel Corporation.
 *
 * This file is subject to the terms and conditions of version 2 of
 * the GNU General Public License. See the file COPYING in the main
 * directory of this archive for more details.
 *
 * IIO driver for STK8312; 7-bit I2C address: 0x3D.
 */

#include <linux/acpi.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/iio/buffer.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/trigger.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/iio/trigger_consumer.h>

#define STK8312_REG_XOUT		0x00
#define STK8312_REG_YOUT		0x01
#define STK8312_REG_ZOUT		0x02
#define STK8312_REG_INTSU		0x06
#define STK8312_REG_MODE		0x07
#define STK8312_REG_SR			0x08
#define STK8312_REG_STH			0x13
#define STK8312_REG_RESET		0x20
#define STK8312_REG_AFECTRL		0x24
#define STK8312_REG_OTPADDR		0x3D
#define STK8312_REG_OTPDATA		0x3E
#define STK8312_REG_OTPCTRL		0x3F

#define STK8312_MODE_ACTIVE		BIT(0)
#define STK8312_MODE_STANDBY		0x00
#define STK8312_MODE_INT_AH_PP		0xC0	/* active-high, push-pull */
#define STK8312_DREADY_BIT		BIT(4)
#define STK8312_RNG_6G			1
#define STK8312_RNG_SHIFT		6
#define STK8312_RNG_MASK		GENMASK(7, 6)
#define STK8312_SR_MASK			GENMASK(2, 0)
#define STK8312_SR_400HZ_IDX		0
#define STK8312_ALL_CHANNEL_MASK	GENMASK(2, 0)
#define STK8312_ALL_CHANNEL_SIZE	3

#define STK8312_DRIVER_NAME		"stk8312"
#define STK8312_GPIO			"stk8312_gpio"
#define STK8312_IRQ_NAME		"stk8312_event"

/*
 * The accelerometer has two measurement ranges:
 *
 * -6g - +6g (8-bit, signed)
 * -16g - +16g (8-bit, signed)
 *
 * scale1 = (6 + 6) * 9.81 / (2^8 - 1)     = 0.4616
 * scale2 = (16 + 16) * 9.81 / (2^8 - 1)   = 1.2311
 */
#define STK8312_SCALE_AVAIL		"0.4616 1.2311"

static const int stk8312_scale_table[][2] = {
	{0, 461600}, {1, 231100}
};

static const struct {
	int val;
	int val2;
} stk8312_samp_freq_table[] = {
	{400, 0}, {200, 0}, {100, 0}, {50, 0}, {25, 0},
	{12, 500000}, {6, 250000}, {3, 125000}
};

#define STK8312_ACCEL_CHANNEL(index, reg, axis) {			\
	.type = IIO_ACCEL,						\
	.address = reg,							\
	.modified = 1,							\
	.channel2 = IIO_MOD_##axis,					\
	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),			\
	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) |		\
				    BIT(IIO_CHAN_INFO_SAMP_FREQ),	\
	.scan_index = index,						\
	.scan_type = {							\
		.sign = 's',						\
		.realbits = 8,						\
		.storagebits = 8,					\
		.endianness = IIO_CPU,					\
	},								\
}

static const struct iio_chan_spec stk8312_channels[] = {
	STK8312_ACCEL_CHANNEL(0, STK8312_REG_XOUT, X),
	STK8312_ACCEL_CHANNEL(1, STK8312_REG_YOUT, Y),
	STK8312_ACCEL_CHANNEL(2, STK8312_REG_ZOUT, Z),
	IIO_CHAN_SOFT_TIMESTAMP(3),
};

struct stk8312_data {
	struct i2c_client *client;
	struct mutex lock;
	u8 range;
	u8 sample_rate_idx;
	u8 mode;
	struct iio_trigger *dready_trig;
	bool dready_trigger_on;
	s8 buffer[16]; /* 3x8-bit channels + 5x8 padding + 64-bit timestamp */
};

static IIO_CONST_ATTR(in_accel_scale_available, STK8312_SCALE_AVAIL);

static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("3.125 6.25 12.5 25 50 100 200 400");

static struct attribute *stk8312_attributes[] = {
	&iio_const_attr_in_accel_scale_available.dev_attr.attr,
	&iio_const_attr_sampling_frequency_available.dev_attr.attr,
	NULL,
};

static const struct attribute_group stk8312_attribute_group = {
	.attrs = stk8312_attributes
};

static int stk8312_otp_init(struct stk8312_data *data)
{
	int ret;
	int count = 10;
	struct i2c_client *client = data->client;

	ret = i2c_smbus_write_byte_data(client, STK8312_REG_OTPADDR, 0x70);
	if (ret < 0)
		goto exit_err;
	ret = i2c_smbus_write_byte_data(client, STK8312_REG_OTPCTRL, 0x02);
	if (ret < 0)
		goto exit_err;

	do {
		usleep_range(1000, 5000);
		ret = i2c_smbus_read_byte_data(client, STK8312_REG_OTPCTRL);
		if (ret < 0)
			goto exit_err;
		count--;
	} while (!(ret & BIT(7)) && count > 0);

	if (count == 0) {
		ret = -ETIMEDOUT;
		goto exit_err;
	}

	ret = i2c_smbus_read_byte_data(client, STK8312_REG_OTPDATA);
	if (ret == 0)
		ret = -EINVAL;
	if (ret < 0)
		goto exit_err;

	ret = i2c_smbus_write_byte_data(data->client,
			STK8312_REG_AFECTRL, ret);
	if (ret < 0)
		goto exit_err;
	msleep(150);

	return 0;

exit_err:
	dev_err(&client->dev, "failed to initialize sensor\n");
	return ret;
}

static int stk8312_set_mode(struct stk8312_data *data, u8 mode)
{
	int ret;
	struct i2c_client *client = data->client;

	if (mode == data->mode)
		return 0;

	ret = i2c_smbus_write_byte_data(client, STK8312_REG_MODE, mode);
	if (ret < 0) {
		dev_err(&client->dev, "failed to change sensor mode\n");
		return ret;
	}

	data->mode = mode;
	if (mode & STK8312_MODE_ACTIVE) {
		/* Need to run OTP sequence before entering active mode */
		usleep_range(1000, 5000);
		ret = stk8312_otp_init(data);
	}

	return ret;
}

static int stk8312_set_interrupts(struct stk8312_data *data, u8 int_mask)
{
	int ret;
	u8 mode;
	struct i2c_client *client = data->client;

	mode = data->mode;
	/* We need to go in standby mode to modify registers */
	ret = stk8312_set_mode(data, STK8312_MODE_STANDBY);
	if (ret < 0)
		return ret;

	ret = i2c_smbus_write_byte_data(client, STK8312_REG_INTSU, int_mask);
	if (ret < 0) {
		dev_err(&client->dev, "failed to set interrupts\n");
		stk8312_set_mode(data, mode);
		return ret;
	}

	return stk8312_set_mode(data, mode);
}

static int stk8312_data_rdy_trigger_set_state(struct iio_trigger *trig,
					      bool state)
{
	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
	struct stk8312_data *data = iio_priv(indio_dev);
	int ret;

	if (state)
		ret = stk8312_set_interrupts(data, STK8312_DREADY_BIT);
	else
		ret = stk8312_set_interrupts(data, 0x00);

	if (ret < 0) {
		dev_err(&data->client->dev, "failed to set trigger state\n");
		return ret;
	}

	data->dready_trigger_on = state;

	return 0;
}

static const struct iio_trigger_ops stk8312_trigger_ops = {
	.set_trigger_state = stk8312_data_rdy_trigger_set_state,
	.owner = THIS_MODULE,
};

static int stk8312_set_sample_rate(struct stk8312_data *data, u8 rate)
{
	int ret;
	u8 masked_reg;
	u8 mode;
	struct i2c_client *client = data->client;

	if (rate == data->sample_rate_idx)
		return 0;

	mode = data->mode;
	/* We need to go in standby mode to modify registers */
	ret = stk8312_set_mode(data, STK8312_MODE_STANDBY);
	if (ret < 0)
		return ret;

	ret = i2c_smbus_read_byte_data(client, STK8312_REG_SR);
	if (ret < 0)
		goto err_activate;

	masked_reg = (ret & (~STK8312_SR_MASK)) | rate;

	ret = i2c_smbus_write_byte_data(client, STK8312_REG_SR, masked_reg);
	if (ret < 0)
		goto err_activate;

	data->sample_rate_idx = rate;

	return stk8312_set_mode(data, mode);

err_activate:
	dev_err(&client->dev, "failed to set sampling rate\n");
	stk8312_set_mode(data, mode);

	return ret;
}

static int stk8312_set_range(struct stk8312_data *data, u8 range)
{
	int ret;
	u8 masked_reg;
	u8 mode;
	struct i2c_client *client = data->client;

	if (range != 1 && range != 2)
		return -EINVAL;
	else if (range == data->range)
		return 0;

	mode = data->mode;
	/* We need to go in standby mode to modify registers */
	ret = stk8312_set_mode(data, STK8312_MODE_STANDBY);
	if (ret < 0)
		return ret;

	ret = i2c_smbus_read_byte_data(client, STK8312_REG_STH);
	if (ret < 0)
		goto err_activate;

	masked_reg = ret & (~STK8312_RNG_MASK);
	masked_reg |= range << STK8312_RNG_SHIFT;

	ret = i2c_smbus_write_byte_data(client, STK8312_REG_STH, masked_reg);
	if (ret < 0)
		goto err_activate;

	data->range = range;

	return stk8312_set_mode(data, mode);

err_activate:
	dev_err(&client->dev, "failed to change sensor range\n");
	stk8312_set_mode(data, mode);

	return ret;
}

static int stk8312_read_accel(struct stk8312_data *data, u8 address)
{
	int ret;
	struct i2c_client *client = data->client;

	if (address > 2)
		return -EINVAL;

	ret = i2c_smbus_read_byte_data(client, address);
	if (ret < 0)
		dev_err(&client->dev, "register read failed\n");

	return ret;
}

static int stk8312_read_raw(struct iio_dev *indio_dev,
			    struct iio_chan_spec const *chan,
			    int *val, int *val2, long mask)
{
	struct stk8312_data *data = iio_priv(indio_dev);
	int ret;

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		if (iio_buffer_enabled(indio_dev))
			return -EBUSY;
		mutex_lock(&data->lock);
		ret = stk8312_set_mode(data, data->mode | STK8312_MODE_ACTIVE);
		if (ret < 0) {
			mutex_unlock(&data->lock);
			return ret;
		}
		ret = stk8312_read_accel(data, chan->address);
		if (ret < 0) {
			stk8312_set_mode(data,
					 data->mode & (~STK8312_MODE_ACTIVE));
			mutex_unlock(&data->lock);
			return ret;
		}
		*val = sign_extend32(ret, 7);
		ret = stk8312_set_mode(data,
				       data->mode & (~STK8312_MODE_ACTIVE));
		mutex_unlock(&data->lock);
		if (ret < 0)
			return ret;
		return IIO_VAL_INT;
	case IIO_CHAN_INFO_SCALE:
		*val = stk8312_scale_table[data->range - 1][0];
		*val2 = stk8312_scale_table[data->range - 1][1];
		return IIO_VAL_INT_PLUS_MICRO;
	case IIO_CHAN_INFO_SAMP_FREQ:
		*val = stk8312_samp_freq_table[data->sample_rate_idx].val;
		*val2 = stk8312_samp_freq_table[data->sample_rate_idx].val2;
		return IIO_VAL_INT_PLUS_MICRO;
	}

	return -EINVAL;
}

static int stk8312_write_raw(struct iio_dev *indio_dev,
			     struct iio_chan_spec const *chan,
			     int val, int val2, long mask)
{
	int i;
	int index = -1;
	int ret;
	struct stk8312_data *data = iio_priv(indio_dev);

	switch (mask) {
	case IIO_CHAN_INFO_SCALE:
		for (i = 0; i < ARRAY_SIZE(stk8312_scale_table); i++)
			if (val == stk8312_scale_table[i][0] &&
			    val2 == stk8312_scale_table[i][1]) {
				index = i + 1;
				break;
			}
		if (index < 0)
			return -EINVAL;

		mutex_lock(&data->lock);
		ret = stk8312_set_range(data, index);
		mutex_unlock(&data->lock);

		return ret;
	case IIO_CHAN_INFO_SAMP_FREQ:
		for (i = 0; i < ARRAY_SIZE(stk8312_samp_freq_table); i++)
			if (val == stk8312_samp_freq_table[i].val &&
			    val2 == stk8312_samp_freq_table[i].val2) {
				index = i;
				break;
			}
		if (index < 0)
			return -EINVAL;
		mutex_lock(&data->lock);
		ret = stk8312_set_sample_rate(data, index);
		mutex_unlock(&data->lock);

		return ret;
	}

	return -EINVAL;
}

static const struct iio_info stk8312_info = {
	.driver_module		= THIS_MODULE,
	.read_raw		= stk8312_read_raw,
	.write_raw		= stk8312_write_raw,
	.attrs			= &stk8312_attribute_group,
};

static irqreturn_t stk8312_trigger_handler(int irq, void *p)
{
	struct iio_poll_func *pf = p;
	struct iio_dev *indio_dev = pf->indio_dev;
	struct stk8312_data *data = iio_priv(indio_dev);
	int bit, ret, i = 0;
	u8 buffer[STK8312_ALL_CHANNEL_SIZE];

	mutex_lock(&data->lock);
	/*
	 * Do a bulk read if all channels are requested,
	 * from 0x00 (XOUT) to 0x02 (ZOUT)
	 */
	if (*(indio_dev->active_scan_mask) == STK8312_ALL_CHANNEL_MASK) {
		ret = i2c_smbus_read_i2c_block_data(data->client,
						    STK8312_REG_XOUT,
						    STK8312_ALL_CHANNEL_SIZE,
						    buffer);
		if (ret < STK8312_ALL_CHANNEL_SIZE) {
			dev_err(&data->client->dev, "register read failed\n");
			mutex_unlock(&data->lock);
			goto err;
		}
		data->buffer[0] = buffer[0];
		data->buffer[1] = buffer[1];
		data->buffer[2] = buffer[2];
	} else {
		for_each_set_bit(bit, indio_dev->active_scan_mask,
			   indio_dev->masklength) {
			ret = stk8312_read_accel(data, bit);
			if (ret < 0) {
				mutex_unlock(&data->lock);
				goto err;
			}
			data->buffer[i++] = ret;
		}
	}
	mutex_unlock(&data->lock);

	iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
					   pf->timestamp);
err:
	iio_trigger_notify_done(indio_dev->trig);

	return IRQ_HANDLED;
}

static irqreturn_t stk8312_data_rdy_trig_poll(int irq, void *private)
{
	struct iio_dev *indio_dev = private;
	struct stk8312_data *data = iio_priv(indio_dev);

	if (data->dready_trigger_on)
		iio_trigger_poll(data->dready_trig);

	return IRQ_HANDLED;
}

static int stk8312_buffer_preenable(struct iio_dev *indio_dev)
{
	struct stk8312_data *data = iio_priv(indio_dev);

	return stk8312_set_mode(data, data->mode | STK8312_MODE_ACTIVE);
}

static int stk8312_buffer_postdisable(struct iio_dev *indio_dev)
{
	struct stk8312_data *data = iio_priv(indio_dev);

	return stk8312_set_mode(data, data->mode & (~STK8312_MODE_ACTIVE));
}

static const struct iio_buffer_setup_ops stk8312_buffer_setup_ops = {
	.preenable   = stk8312_buffer_preenable,
	.postenable  = iio_triggered_buffer_postenable,
	.predisable  = iio_triggered_buffer_predisable,
	.postdisable = stk8312_buffer_postdisable,
};

static int stk8312_gpio_probe(struct i2c_client *client)
{
	struct device *dev;
	struct gpio_desc *gpio;
	int ret;

	if (!client)
		return -EINVAL;

	dev = &client->dev;

	/* data ready gpio interrupt pin */
	gpio = devm_gpiod_get_index(dev, STK8312_GPIO, 0, GPIOD_IN);
	if (IS_ERR(gpio)) {
		dev_err(dev, "acpi gpio get index failed\n");
		return PTR_ERR(gpio);
	}

	ret = gpiod_to_irq(gpio);
	dev_dbg(dev, "GPIO resource, no:%d irq:%d\n", desc_to_gpio(gpio), ret);

	return ret;
}

static int stk8312_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	int ret;
	struct iio_dev *indio_dev;
	struct stk8312_data *data;

	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
	if (!indio_dev) {
		dev_err(&client->dev, "iio allocation failed!\n");
		return -ENOMEM;
	}

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

	indio_dev->dev.parent = &client->dev;
	indio_dev->info = &stk8312_info;
	indio_dev->name = STK8312_DRIVER_NAME;
	indio_dev->modes = INDIO_DIRECT_MODE;
	indio_dev->channels = stk8312_channels;
	indio_dev->num_channels = ARRAY_SIZE(stk8312_channels);

	/* A software reset is recommended at power-on */
	ret = i2c_smbus_write_byte_data(data->client, STK8312_REG_RESET, 0x00);
	if (ret < 0) {
		dev_err(&client->dev, "failed to reset sensor\n");
		return ret;
	}
	data->sample_rate_idx = STK8312_SR_400HZ_IDX;
	ret = stk8312_set_range(data, STK8312_RNG_6G);
	if (ret < 0)
		return ret;

	ret = stk8312_set_mode(data,
			       STK8312_MODE_INT_AH_PP | STK8312_MODE_ACTIVE);
	if (ret < 0)
		return ret;

	if (client->irq < 0)
		client->irq = stk8312_gpio_probe(client);

	if (client->irq >= 0) {
		ret = devm_request_threaded_irq(&client->dev, client->irq,
						stk8312_data_rdy_trig_poll,
						NULL,
						IRQF_TRIGGER_RISING |
						IRQF_ONESHOT,
						STK8312_IRQ_NAME,
						indio_dev);
		if (ret < 0) {
			dev_err(&client->dev, "request irq %d failed\n",
				client->irq);
			goto err_power_off;
		}

		data->dready_trig = devm_iio_trigger_alloc(&client->dev,
							   "%s-dev%d",
							   indio_dev->name,
							   indio_dev->id);
		if (!data->dready_trig) {
			ret = -ENOMEM;
			goto err_power_off;
		}

		data->dready_trig->dev.parent = &client->dev;
		data->dready_trig->ops = &stk8312_trigger_ops;
		iio_trigger_set_drvdata(data->dready_trig, indio_dev);
		ret = iio_trigger_register(data->dready_trig);
		if (ret) {
			dev_err(&client->dev, "iio trigger register failed\n");
			goto err_power_off;
		}
	}

	ret = iio_triggered_buffer_setup(indio_dev,
					 iio_pollfunc_store_time,
					 stk8312_trigger_handler,
					 &stk8312_buffer_setup_ops);
	if (ret < 0) {
		dev_err(&client->dev, "iio triggered buffer setup failed\n");
		goto err_trigger_unregister;
	}

	ret = iio_device_register(indio_dev);
	if (ret < 0) {
		dev_err(&client->dev, "device_register failed\n");
		goto err_buffer_cleanup;
	}

	return 0;

err_buffer_cleanup:
	iio_triggered_buffer_cleanup(indio_dev);
err_trigger_unregister:
	if (data->dready_trig)
		iio_trigger_unregister(data->dready_trig);
err_power_off:
	stk8312_set_mode(data, STK8312_MODE_STANDBY);
	return ret;
}

static int stk8312_remove(struct i2c_client *client)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(client);
	struct stk8312_data *data = iio_priv(indio_dev);

	iio_device_unregister(indio_dev);
	iio_triggered_buffer_cleanup(indio_dev);

	if (data->dready_trig)
		iio_trigger_unregister(data->dready_trig);

	return stk8312_set_mode(data, STK8312_MODE_STANDBY);
}

#ifdef CONFIG_PM_SLEEP
static int stk8312_suspend(struct device *dev)
{
	struct stk8312_data *data;

	data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));

	return stk8312_set_mode(data, data->mode & (~STK8312_MODE_ACTIVE));
}

static int stk8312_resume(struct device *dev)
{
	struct stk8312_data *data;

	data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));

	return stk8312_set_mode(data, data->mode | STK8312_MODE_ACTIVE);
}

static SIMPLE_DEV_PM_OPS(stk8312_pm_ops, stk8312_suspend, stk8312_resume);

#define STK8312_PM_OPS (&stk8312_pm_ops)
#else
#define STK8312_PM_OPS NULL
#endif

static const struct i2c_device_id stk8312_i2c_id[] = {
	{"STK8312", 0},
	{}
};
MODULE_DEVICE_TABLE(i2c, stk8312_i2c_id);

static const struct acpi_device_id stk8312_acpi_id[] = {
	{"STK8312", 0},
	{}
};

MODULE_DEVICE_TABLE(acpi, stk8312_acpi_id);

static struct i2c_driver stk8312_driver = {
	.driver = {
		.name = STK8312_DRIVER_NAME,
		.pm = STK8312_PM_OPS,
		.acpi_match_table = ACPI_PTR(stk8312_acpi_id),
	},
	.probe =            stk8312_probe,
	.remove =           stk8312_remove,
	.id_table =         stk8312_i2c_id,
};

module_i2c_driver(stk8312_driver);

MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>");
MODULE_DESCRIPTION("STK8312 3-Axis Accelerometer driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
90bad33a TB	1	/**
	2	* Sensortek STK8312 3-Axis Accelerometer
	3	*
	4	* Copyright (c) 2015, Intel Corporation.
	5	*
	6	* This file is subject to the terms and conditions of version 2 of
	7	* the GNU General Public License. See the file COPYING in the main
	8	* directory of this archive for more details.
	9	*
	10	* IIO driver for STK8312; 7-bit I2C address: 0x3D.
	11	*/
	12
	13	#include <linux/acpi.h>
95c12bba	14	#include <linux/gpio/consumer.h>
90bad33a	15	#include <linux/i2c.h>
95c12bba	16	#include <linux/interrupt.h>
90bad33a TB	17	#include <linux/kernel.h>
	18	#include <linux/module.h>
	19	#include <linux/delay.h>
95c12bba	20	#include <linux/iio/buffer.h>
90bad33a TB	21	#include <linux/iio/iio.h>
90bad33a TB	22	#include <linux/iio/sysfs.h>
95c12bba TB	23	#include <linux/iio/trigger.h>
	24	#include <linux/iio/triggered_buffer.h>
	25	#include <linux/iio/trigger_consumer.h>
90bad33a TB	26
	27	#define STK8312_REG_XOUT 0x00
	28	#define STK8312_REG_YOUT 0x01
	29	#define STK8312_REG_ZOUT 0x02
95c12bba	30	#define STK8312_REG_INTSU 0x06
90bad33a	31	#define STK8312_REG_MODE 0x07
5e913d27	32	#define STK8312_REG_SR 0x08
90bad33a TB	33	#define STK8312_REG_STH 0x13
	34	#define STK8312_REG_RESET 0x20
	35	#define STK8312_REG_AFECTRL 0x24
	36	#define STK8312_REG_OTPADDR 0x3D
	37	#define STK8312_REG_OTPDATA 0x3E
	38	#define STK8312_REG_OTPCTRL 0x3F
	39
03ecd50c	40	#define STK8312_MODE_ACTIVE BIT(0)
95c12bba	41	#define STK8312_MODE_STANDBY 0x00
03ecd50c HK	42	#define STK8312_MODE_INT_AH_PP 0xC0 /* active-high, push-pull */
	43	#define STK8312_DREADY_BIT BIT(4)
	44	#define STK8312_RNG_6G 1
90bad33a	45	#define STK8312_RNG_SHIFT 6
03ecd50c HK	46	#define STK8312_RNG_MASK GENMASK(7, 6)
	47	#define STK8312_SR_MASK GENMASK(2, 0)
	48	#define STK8312_SR_400HZ_IDX 0
	49	#define STK8312_ALL_CHANNEL_MASK GENMASK(2, 0)
95c12bba	50	#define STK8312_ALL_CHANNEL_SIZE 3
90bad33a TB	51
90bad33a TB	52	#define STK8312_DRIVER_NAME "stk8312"
95c12bba TB	53	#define STK8312_GPIO "stk8312_gpio"
95c12bba TB	54	#define STK8312_IRQ_NAME "stk8312_event"
90bad33a TB	55
	56	/*
	57	* The accelerometer has two measurement ranges:
	58	*
	59	* -6g - +6g (8-bit, signed)
	60	* -16g - +16g (8-bit, signed)
	61	*
	62	* scale1 = (6 + 6) * 9.81 / (2^8 - 1) = 0.4616
	63	* scale2 = (16 + 16) * 9.81 / (2^8 - 1) = 1.2311
	64	*/
	65	#define STK8312_SCALE_AVAIL "0.4616 1.2311"
	66
	67	static const int stk8312_scale_table[][2] = {
	68	{0, 461600}, {1, 231100}
	69	};
	70
5e913d27	71	static const struct {
7d73e02c HK	72	int val;
7d73e02c HK	73	int val2;
5e913d27 TB	74	} stk8312_samp_freq_table[] = {
	75	{400, 0}, {200, 0}, {100, 0}, {50, 0}, {25, 0},
	76	{12, 500000}, {6, 250000}, {3, 125000}
	77	};
	78
	79	#define STK8312_ACCEL_CHANNEL(index, reg, axis) { \
	80	.type = IIO_ACCEL, \
	81	.address = reg, \
	82	.modified = 1, \
	83	.channel2 = IIO_MOD_##axis, \
	84	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
	85	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) \| \
	86	BIT(IIO_CHAN_INFO_SAMP_FREQ), \
	87	.scan_index = index, \
	88	.scan_type = { \
	89	.sign = 's', \
	90	.realbits = 8, \
	91	.storagebits = 8, \
	92	.endianness = IIO_CPU, \
	93	}, \
90bad33a TB	94	}
	95
	96	static const struct iio_chan_spec stk8312_channels[] = {
95c12bba TB	97	STK8312_ACCEL_CHANNEL(0, STK8312_REG_XOUT, X),
	98	STK8312_ACCEL_CHANNEL(1, STK8312_REG_YOUT, Y),
	99	STK8312_ACCEL_CHANNEL(2, STK8312_REG_ZOUT, Z),
	100	IIO_CHAN_SOFT_TIMESTAMP(3),
90bad33a TB	101	};
	102
	103	struct stk8312_data {
	104	struct i2c_client *client;
	105	struct mutex lock;
7d73e02c	106	u8 range;
5e913d27	107	u8 sample_rate_idx;
90bad33a	108	u8 mode;
95c12bba TB	109	struct iio_trigger *dready_trig;
	110	bool dready_trigger_on;
	111	s8 buffer[16]; /* 3x8-bit channels + 5x8 padding + 64-bit timestamp */
90bad33a TB	112	};
	113
	114	static IIO_CONST_ATTR(in_accel_scale_available, STK8312_SCALE_AVAIL);
	115
5e913d27 TB	116	static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("3.125 6.25 12.5 25 50 100 200 400");
5e913d27 TB	117
90bad33a TB	118	static struct attribute *stk8312_attributes[] = {
90bad33a TB	119	&iio_const_attr_in_accel_scale_available.dev_attr.attr,
5e913d27	120	&iio_const_attr_sampling_frequency_available.dev_attr.attr,
90bad33a TB	121	NULL,
	122	};
	123
	124	static const struct attribute_group stk8312_attribute_group = {
	125	.attrs = stk8312_attributes
	126	};
	127
	128	static int stk8312_otp_init(struct stk8312_data *data)
	129	{
	130	int ret;
	131	int count = 10;
	132	struct i2c_client *client = data->client;
	133
	134	ret = i2c_smbus_write_byte_data(client, STK8312_REG_OTPADDR, 0x70);
	135	if (ret < 0)
	136	goto exit_err;
	137	ret = i2c_smbus_write_byte_data(client, STK8312_REG_OTPCTRL, 0x02);
	138	if (ret < 0)
	139	goto exit_err;
	140
	141	do {
	142	usleep_range(1000, 5000);
	143	ret = i2c_smbus_read_byte_data(client, STK8312_REG_OTPCTRL);
	144	if (ret < 0)
	145	goto exit_err;
	146	count--;
03ecd50c	147	} while (!(ret & BIT(7)) && count > 0);
90bad33a	148
18422bb3 HK	149	if (count == 0) {
18422bb3 HK	150	ret = -ETIMEDOUT;
90bad33a	151	goto exit_err;
18422bb3	152	}
90bad33a TB	153
90bad33a TB	154	ret = i2c_smbus_read_byte_data(client, STK8312_REG_OTPDATA);
b41e63cf HK	155	if (ret == 0)
b41e63cf HK	156	ret = -EINVAL;
90bad33a TB	157	if (ret < 0)
	158	goto exit_err;
	159
	160	ret = i2c_smbus_write_byte_data(data->client,
	161	STK8312_REG_AFECTRL, ret);
	162	if (ret < 0)
	163	goto exit_err;
	164	msleep(150);
	165
18422bb3	166	return 0;
90bad33a TB	167
	168	exit_err:
	169	dev_err(&client->dev, "failed to initialize sensor\n");
	170	return ret;
	171	}
	172
	173	static int stk8312_set_mode(struct stk8312_data *data, u8 mode)
	174	{
	175	int ret;
90bad33a TB	176	struct i2c_client *client = data->client;
90bad33a TB	177
95c12bba	178	if (mode == data->mode)
90bad33a TB	179	return 0;
90bad33a TB	180
95c12bba	181	ret = i2c_smbus_write_byte_data(client, STK8312_REG_MODE, mode);
90bad33a TB	182	if (ret < 0) {
	183	dev_err(&client->dev, "failed to change sensor mode\n");
	184	return ret;
	185	}
	186
	187	data->mode = mode;
95c12bba	188	if (mode & STK8312_MODE_ACTIVE) {
90bad33a TB	189	/* Need to run OTP sequence before entering active mode */
	190	usleep_range(1000, 5000);
	191	ret = stk8312_otp_init(data);
	192	}
	193
	194	return ret;
	195	}
	196
95c12bba TB	197	static int stk8312_set_interrupts(struct stk8312_data *data, u8 int_mask)
	198	{
	199	int ret;
	200	u8 mode;
	201	struct i2c_client *client = data->client;
	202
	203	mode = data->mode;
	204	/* We need to go in standby mode to modify registers */
	205	ret = stk8312_set_mode(data, STK8312_MODE_STANDBY);
	206	if (ret < 0)
	207	return ret;
	208
	209	ret = i2c_smbus_write_byte_data(client, STK8312_REG_INTSU, int_mask);
18422bb3	210	if (ret < 0) {
95c12bba	211	dev_err(&client->dev, "failed to set interrupts\n");
18422bb3 HK	212	stk8312_set_mode(data, mode);
	213	return ret;
	214	}
95c12bba TB	215
	216	return stk8312_set_mode(data, mode);
	217	}
	218
	219	static int stk8312_data_rdy_trigger_set_state(struct iio_trigger *trig,
	220	bool state)
	221	{
	222	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
	223	struct stk8312_data *data = iio_priv(indio_dev);
	224	int ret;
	225
	226	if (state)
	227	ret = stk8312_set_interrupts(data, STK8312_DREADY_BIT);
	228	else
	229	ret = stk8312_set_interrupts(data, 0x00);
	230
	231	if (ret < 0) {
	232	dev_err(&data->client->dev, "failed to set trigger state\n");
	233	return ret;
	234	}
	235
	236	data->dready_trigger_on = state;
	237
18422bb3	238	return 0;
95c12bba TB	239	}
	240
	241	static const struct iio_trigger_ops stk8312_trigger_ops = {
	242	.set_trigger_state = stk8312_data_rdy_trigger_set_state,
	243	.owner = THIS_MODULE,
	244	};
	245
7d73e02c	246	static int stk8312_set_sample_rate(struct stk8312_data *data, u8 rate)
5e913d27 TB	247	{
	248	int ret;
	249	u8 masked_reg;
	250	u8 mode;
	251	struct i2c_client *client = data->client;
	252
	253	if (rate == data->sample_rate_idx)
	254	return 0;
	255
	256	mode = data->mode;
	257	/* We need to go in standby mode to modify registers */
	258	ret = stk8312_set_mode(data, STK8312_MODE_STANDBY);
	259	if (ret < 0)
	260	return ret;
	261
	262	ret = i2c_smbus_read_byte_data(client, STK8312_REG_SR);
18422bb3 HK	263	if (ret < 0)
18422bb3 HK	264	goto err_activate;
5e913d27 TB	265
	266	masked_reg = (ret & (~STK8312_SR_MASK)) \| rate;
	267
	268	ret = i2c_smbus_write_byte_data(client, STK8312_REG_SR, masked_reg);
	269	if (ret < 0)
18422bb3 HK	270	goto err_activate;
	271
	272	data->sample_rate_idx = rate;
5e913d27 TB	273
5e913d27 TB	274	return stk8312_set_mode(data, mode);
18422bb3 HK	275
	276	err_activate:
	277	dev_err(&client->dev, "failed to set sampling rate\n");
	278	stk8312_set_mode(data, mode);
	279
	280	return ret;
5e913d27 TB	281	}
5e913d27 TB	282
90bad33a TB	283	static int stk8312_set_range(struct stk8312_data *data, u8 range)
	284	{
	285	int ret;
	286	u8 masked_reg;
	287	u8 mode;
	288	struct i2c_client *client = data->client;
	289
	290	if (range != 1 && range != 2)
	291	return -EINVAL;
	292	else if (range == data->range)
	293	return 0;
	294
	295	mode = data->mode;
	296	/* We need to go in standby mode to modify registers */
	297	ret = stk8312_set_mode(data, STK8312_MODE_STANDBY);
	298	if (ret < 0)
	299	return ret;
	300
	301	ret = i2c_smbus_read_byte_data(client, STK8312_REG_STH);
18422bb3 HK	302	if (ret < 0)
18422bb3 HK	303	goto err_activate;
90bad33a TB	304
	305	masked_reg = ret & (~STK8312_RNG_MASK);
	306	masked_reg \|= range << STK8312_RNG_SHIFT;
	307
	308	ret = i2c_smbus_write_byte_data(client, STK8312_REG_STH, masked_reg);
	309	if (ret < 0)
18422bb3 HK	310	goto err_activate;
	311
	312	data->range = range;
90bad33a TB	313
90bad33a TB	314	return stk8312_set_mode(data, mode);
18422bb3 HK	315
	316	err_activate:
	317	dev_err(&client->dev, "failed to change sensor range\n");
	318	stk8312_set_mode(data, mode);
	319
	320	return ret;
90bad33a TB	321	}
	322
	323	static int stk8312_read_accel(struct stk8312_data *data, u8 address)
	324	{
	325	int ret;
	326	struct i2c_client *client = data->client;
	327
	328	if (address > 2)
	329	return -EINVAL;
	330
	331	ret = i2c_smbus_read_byte_data(client, address);
95c12bba	332	if (ret < 0)
90bad33a	333	dev_err(&client->dev, "register read failed\n");
90bad33a	334
95c12bba	335	return ret;
90bad33a TB	336	}
	337
	338	static int stk8312_read_raw(struct iio_dev *indio_dev,
	339	struct iio_chan_spec const *chan,
	340	int val, int val2, long mask)
	341	{
	342	struct stk8312_data *data = iio_priv(indio_dev);
95c12bba	343	int ret;
90bad33a TB	344
	345	switch (mask) {
	346	case IIO_CHAN_INFO_RAW:
95c12bba TB	347	if (iio_buffer_enabled(indio_dev))
95c12bba TB	348	return -EBUSY;
90bad33a	349	mutex_lock(&data->lock);
95c12bba TB	350	ret = stk8312_set_mode(data, data->mode \| STK8312_MODE_ACTIVE);
	351	if (ret < 0) {
	352	mutex_unlock(&data->lock);
18422bb3	353	return ret;
95c12bba TB	354	}
	355	ret = stk8312_read_accel(data, chan->address);
	356	if (ret < 0) {
	357	stk8312_set_mode(data,
	358	data->mode & (~STK8312_MODE_ACTIVE));
	359	mutex_unlock(&data->lock);
18422bb3	360	return ret;
95c12bba TB	361	}
95c12bba TB	362	*val = sign_extend32(ret, 7);
18422bb3 HK	363	ret = stk8312_set_mode(data,
18422bb3 HK	364	data->mode & (~STK8312_MODE_ACTIVE));
90bad33a	365	mutex_unlock(&data->lock);
18422bb3 HK	366	if (ret < 0)
18422bb3 HK	367	return ret;
90bad33a TB	368	return IIO_VAL_INT;
	369	case IIO_CHAN_INFO_SCALE:
	370	*val = stk8312_scale_table[data->range - 1][0];
	371	*val2 = stk8312_scale_table[data->range - 1][1];
	372	return IIO_VAL_INT_PLUS_MICRO;
5e913d27 TB	373	case IIO_CHAN_INFO_SAMP_FREQ:
	374	*val = stk8312_samp_freq_table[data->sample_rate_idx].val;
	375	*val2 = stk8312_samp_freq_table[data->sample_rate_idx].val2;
	376	return IIO_VAL_INT_PLUS_MICRO;
90bad33a TB	377	}
	378
	379	return -EINVAL;
	380	}
	381
	382	static int stk8312_write_raw(struct iio_dev *indio_dev,
	383	struct iio_chan_spec const *chan,
	384	int val, int val2, long mask)
	385	{
	386	int i;
	387	int index = -1;
	388	int ret;
	389	struct stk8312_data *data = iio_priv(indio_dev);
	390
	391	switch (mask) {
	392	case IIO_CHAN_INFO_SCALE:
	393	for (i = 0; i < ARRAY_SIZE(stk8312_scale_table); i++)
	394	if (val == stk8312_scale_table[i][0] &&
	395	val2 == stk8312_scale_table[i][1]) {
	396	index = i + 1;
	397	break;
	398	}
	399	if (index < 0)
	400	return -EINVAL;
	401
	402	mutex_lock(&data->lock);
	403	ret = stk8312_set_range(data, index);
	404	mutex_unlock(&data->lock);
	405
5e913d27 TB	406	return ret;
	407	case IIO_CHAN_INFO_SAMP_FREQ:
	408	for (i = 0; i < ARRAY_SIZE(stk8312_samp_freq_table); i++)
	409	if (val == stk8312_samp_freq_table[i].val &&
	410	val2 == stk8312_samp_freq_table[i].val2) {
	411	index = i;
	412	break;
	413	}
	414	if (index < 0)
	415	return -EINVAL;
	416	mutex_lock(&data->lock);
	417	ret = stk8312_set_sample_rate(data, index);
	418	mutex_unlock(&data->lock);
	419
90bad33a TB	420	return ret;
	421	}
	422
	423	return -EINVAL;
	424	}
	425
	426	static const struct iio_info stk8312_info = {
	427	.driver_module = THIS_MODULE,
	428	.read_raw = stk8312_read_raw,
	429	.write_raw = stk8312_write_raw,
	430	.attrs = &stk8312_attribute_group,
	431	};
	432
95c12bba TB	433	static irqreturn_t stk8312_trigger_handler(int irq, void *p)
	434	{
	435	struct iio_poll_func *pf = p;
	436	struct iio_dev *indio_dev = pf->indio_dev;
	437	struct stk8312_data *data = iio_priv(indio_dev);
	438	int bit, ret, i = 0;
	439	u8 buffer[STK8312_ALL_CHANNEL_SIZE];
	440
	441	mutex_lock(&data->lock);
	442	/*
	443	* Do a bulk read if all channels are requested,
	444	* from 0x00 (XOUT) to 0x02 (ZOUT)
	445	*/
	446	if (*(indio_dev->active_scan_mask) == STK8312_ALL_CHANNEL_MASK) {
	447	ret = i2c_smbus_read_i2c_block_data(data->client,
	448	STK8312_REG_XOUT,
	449	STK8312_ALL_CHANNEL_SIZE,
	450	buffer);
	451	if (ret < STK8312_ALL_CHANNEL_SIZE) {
	452	dev_err(&data->client->dev, "register read failed\n");
	453	mutex_unlock(&data->lock);
	454	goto err;
	455	}
	456	data->buffer[0] = buffer[0];
	457	data->buffer[1] = buffer[1];
	458	data->buffer[2] = buffer[2];
	459	} else {
	460	for_each_set_bit(bit, indio_dev->active_scan_mask,
	461	indio_dev->masklength) {
	462	ret = stk8312_read_accel(data, bit);
	463	if (ret < 0) {
	464	mutex_unlock(&data->lock);
	465	goto err;
	466	}
	467	data->buffer[i++] = ret;
	468	}
	469	}
	470	mutex_unlock(&data->lock);
	471
	472	iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
	473	pf->timestamp);
	474	err:
	475	iio_trigger_notify_done(indio_dev->trig);
	476
	477	return IRQ_HANDLED;
	478	}
	479
	480	static irqreturn_t stk8312_data_rdy_trig_poll(int irq, void *private)
	481	{
	482	struct iio_dev *indio_dev = private;
	483	struct stk8312_data *data = iio_priv(indio_dev);
	484
	485	if (data->dready_trigger_on)
	486	iio_trigger_poll(data->dready_trig);
	487
	488	return IRQ_HANDLED;
	489	}
	490
	491	static int stk8312_buffer_preenable(struct iio_dev *indio_dev)
	492	{
	493	struct stk8312_data *data = iio_priv(indio_dev);
	494
	495	return stk8312_set_mode(data, data->mode \| STK8312_MODE_ACTIVE);
	496	}
497
498	static int stk8312_buffer_postdisable(struct iio_dev *indio_dev)
499	{
500	struct stk8312_data *data = iio_priv(indio_dev);
501
502	return stk8312_set_mode(data, data->mode & (~STK8312_MODE_ACTIVE));
503	}
504
505	static const struct iio_buffer_setup_ops stk8312_buffer_setup_ops = {
506	.preenable = stk8312_buffer_preenable,
507	.postenable = iio_triggered_buffer_postenable,
508	.predisable = iio_triggered_buffer_predisable,
509	.postdisable = stk8312_buffer_postdisable,
510	};
511
512	static int stk8312_gpio_probe(struct i2c_client *client)
513	{
514	struct device *dev;
515	struct gpio_desc *gpio;
516	int ret;
517
518	if (!client)
519	return -EINVAL;
520
521	dev = &client->dev;
522
523	/* data ready gpio interrupt pin */
524	gpio = devm_gpiod_get_index(dev, STK8312_GPIO, 0, GPIOD_IN);
525	if (IS_ERR(gpio)) {
526	dev_err(dev, "acpi gpio get index failed\n");
527	return PTR_ERR(gpio);
528	}
529
530	ret = gpiod_to_irq(gpio);
531	dev_dbg(dev, "GPIO resource, no:%d irq:%d\n", desc_to_gpio(gpio), ret);
532
533	return ret;
534	}
535
90bad33a TB	536	static int stk8312_probe(struct i2c_client *client,
	537	const struct i2c_device_id *id)
	538	{
	539	int ret;
	540	struct iio_dev *indio_dev;
	541	struct stk8312_data *data;
	542
	543	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
	544	if (!indio_dev) {
	545	dev_err(&client->dev, "iio allocation failed!\n");
	546	return -ENOMEM;
	547	}
	548
	549	data = iio_priv(indio_dev);
	550	data->client = client;
	551	i2c_set_clientdata(client, indio_dev);
	552	mutex_init(&data->lock);
	553
	554	indio_dev->dev.parent = &client->dev;
	555	indio_dev->info = &stk8312_info;
	556	indio_dev->name = STK8312_DRIVER_NAME;
	557	indio_dev->modes = INDIO_DIRECT_MODE;
	558	indio_dev->channels = stk8312_channels;
	559	indio_dev->num_channels = ARRAY_SIZE(stk8312_channels);
	560
	561	/* A software reset is recommended at power-on */
	562	ret = i2c_smbus_write_byte_data(data->client, STK8312_REG_RESET, 0x00);
	563	if (ret < 0) {
	564	dev_err(&client->dev, "failed to reset sensor\n");
	565	return ret;
	566	}
5e913d27	567	data->sample_rate_idx = STK8312_SR_400HZ_IDX;
03ecd50c	568	ret = stk8312_set_range(data, STK8312_RNG_6G);
90bad33a TB	569	if (ret < 0)
	570	return ret;
	571
03ecd50c HK	572	ret = stk8312_set_mode(data,
03ecd50c HK	573	STK8312_MODE_INT_AH_PP \| STK8312_MODE_ACTIVE);
90bad33a TB	574	if (ret < 0)
	575	return ret;
	576
95c12bba TB	577	if (client->irq < 0)
	578	client->irq = stk8312_gpio_probe(client);
	579
	580	if (client->irq >= 0) {
	581	ret = devm_request_threaded_irq(&client->dev, client->irq,
	582	stk8312_data_rdy_trig_poll,
	583	NULL,
	584	IRQF_TRIGGER_RISING \|
	585	IRQF_ONESHOT,
	586	STK8312_IRQ_NAME,
	587	indio_dev);
	588	if (ret < 0) {
	589	dev_err(&client->dev, "request irq %d failed\n",
	590	client->irq);
	591	goto err_power_off;
	592	}
	593
	594	data->dready_trig = devm_iio_trigger_alloc(&client->dev,
	595	"%s-dev%d",
	596	indio_dev->name,
	597	indio_dev->id);
	598	if (!data->dready_trig) {
	599	ret = -ENOMEM;
	600	goto err_power_off;
	601	}
	602
	603	data->dready_trig->dev.parent = &client->dev;
	604	data->dready_trig->ops = &stk8312_trigger_ops;
	605	iio_trigger_set_drvdata(data->dready_trig, indio_dev);
	606	ret = iio_trigger_register(data->dready_trig);
	607	if (ret) {
	608	dev_err(&client->dev, "iio trigger register failed\n");
	609	goto err_power_off;
	610	}
	611	}
	612
	613	ret = iio_triggered_buffer_setup(indio_dev,
	614	iio_pollfunc_store_time,
	615	stk8312_trigger_handler,
	616	&stk8312_buffer_setup_ops);
	617	if (ret < 0) {
	618	dev_err(&client->dev, "iio triggered buffer setup failed\n");
	619	goto err_trigger_unregister;
	620	}
	621
90bad33a TB	622	ret = iio_device_register(indio_dev);
	623	if (ret < 0) {
	624	dev_err(&client->dev, "device_register failed\n");
95c12bba	625	goto err_buffer_cleanup;
90bad33a TB	626	}
90bad33a TB	627
18422bb3	628	return 0;
95c12bba TB	629
	630	err_buffer_cleanup:
	631	iio_triggered_buffer_cleanup(indio_dev);
	632	err_trigger_unregister:
	633	if (data->dready_trig)
	634	iio_trigger_unregister(data->dready_trig);
	635	err_power_off:
	636	stk8312_set_mode(data, STK8312_MODE_STANDBY);
	637	return ret;
90bad33a TB	638	}
	639
	640	static int stk8312_remove(struct i2c_client *client)
	641	{
	642	struct iio_dev *indio_dev = i2c_get_clientdata(client);
95c12bba	643	struct stk8312_data *data = iio_priv(indio_dev);
90bad33a TB	644
90bad33a TB	645	iio_device_unregister(indio_dev);
95c12bba	646	iio_triggered_buffer_cleanup(indio_dev);
90bad33a	647
95c12bba TB	648	if (data->dready_trig)
	649	iio_trigger_unregister(data->dready_trig);
	650
	651	return stk8312_set_mode(data, STK8312_MODE_STANDBY);
90bad33a TB	652	}
	653
	654	#ifdef CONFIG_PM_SLEEP
	655	static int stk8312_suspend(struct device *dev)
	656	{
	657	struct stk8312_data *data;
	658
	659	data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
	660
95c12bba	661	return stk8312_set_mode(data, data->mode & (~STK8312_MODE_ACTIVE));
90bad33a TB	662	}
	663
	664	static int stk8312_resume(struct device *dev)
	665	{
	666	struct stk8312_data *data;
	667
	668	data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
	669
95c12bba	670	return stk8312_set_mode(data, data->mode \| STK8312_MODE_ACTIVE);
90bad33a TB	671	}
	672
	673	static SIMPLE_DEV_PM_OPS(stk8312_pm_ops, stk8312_suspend, stk8312_resume);
	674
	675	#define STK8312_PM_OPS (&stk8312_pm_ops)
	676	#else
	677	#define STK8312_PM_OPS NULL
	678	#endif
	679
	680	static const struct i2c_device_id stk8312_i2c_id[] = {
	681	{"STK8312", 0},
	682	{}
	683	};
58e446fc	684	MODULE_DEVICE_TABLE(i2c, stk8312_i2c_id);
90bad33a TB	685
	686	static const struct acpi_device_id stk8312_acpi_id[] = {
	687	{"STK8312", 0},
	688	{}
	689	};
	690
	691	MODULE_DEVICE_TABLE(acpi, stk8312_acpi_id);
	692
	693	static struct i2c_driver stk8312_driver = {
	694	.driver = {
03ecd50c	695	.name = STK8312_DRIVER_NAME,
90bad33a TB	696	.pm = STK8312_PM_OPS,
	697	.acpi_match_table = ACPI_PTR(stk8312_acpi_id),
	698	},
	699	.probe = stk8312_probe,
	700	.remove = stk8312_remove,
	701	.id_table = stk8312_i2c_id,
	702	};
	703
	704	module_i2c_driver(stk8312_driver);
	705
	706	MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>");
	707	MODULE_DESCRIPTION("STK8312 3-Axis Accelerometer driver");
	708	MODULE_LICENSE("GPL v2");