[deliverable/linux.git] / drivers / iio / accel / stk8ba50.c

/**
 * Sensortek STK8BA50 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.
 *
 * STK8BA50 7-bit I2C address: 0x18.
 */

#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/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 STK8BA50_REG_XOUT			0x02
#define STK8BA50_REG_YOUT			0x04
#define STK8BA50_REG_ZOUT			0x06
#define STK8BA50_REG_RANGE			0x0F
#define STK8BA50_REG_BWSEL			0x10
#define STK8BA50_REG_POWMODE			0x11
#define STK8BA50_REG_SWRST			0x14
#define STK8BA50_REG_INTEN2			0x17
#define STK8BA50_REG_INTMAP2			0x1A

#define STK8BA50_MODE_NORMAL			0
#define STK8BA50_MODE_SUSPEND			1
#define STK8BA50_MODE_POWERBIT			BIT(7)
#define STK8BA50_DATA_SHIFT			6
#define STK8BA50_RESET_CMD			0xB6
#define STK8BA50_SR_1792HZ_IDX			7
#define STK8BA50_DREADY_INT_MASK		0x10
#define STK8BA50_DREADY_INT_MAP			0x81
#define STK8BA50_ALL_CHANNEL_MASK		7
#define STK8BA50_ALL_CHANNEL_SIZE		6

#define STK8BA50_DRIVER_NAME			"stk8ba50"
#define STK8BA50_IRQ_NAME			"stk8ba50_event"

#define STK8BA50_SCALE_AVAIL			"0.0384 0.0767 0.1534 0.3069"

/*
 * The accelerometer has four measurement ranges:
 * +/-2g; +/-4g; +/-8g; +/-16g
 *
 * Acceleration values are 10-bit, 2's complement.
 * Scales are calculated as following:
 *
 * scale1 = (2 + 2) * 9.81 / (2^10 - 1)   = 0.0384
 * scale2 = (4 + 4) * 9.81 / (2^10 - 1)   = 0.0767
 * etc.
 *
 * Scales are stored in this format:
 * { <register value>, <scale value> }
 *
 * Locally, the range is stored as a table index.
 */
static const struct {
	u8 reg_val;
	u32 scale_val;
} stk8ba50_scale_table[] = {
	{3, 38400}, {5, 76700}, {8, 153400}, {12, 306900}
};

/* Sample rates are stored as { <register value>, <Hz value> } */
static const struct {
	u8 reg_val;
	u16 samp_freq;
} stk8ba50_samp_freq_table[] = {
	{0x08, 14},  {0x09, 25},  {0x0A, 56},  {0x0B, 112},
	{0x0C, 224}, {0x0D, 448}, {0x0E, 896}, {0x0F, 1792}
};

/* Used to map scan mask bits to their corresponding channel register. */
static const int stk8ba50_channel_table[] = {
	STK8BA50_REG_XOUT,
	STK8BA50_REG_YOUT,
	STK8BA50_REG_ZOUT
};

struct stk8ba50_data {
	struct i2c_client *client;
	struct mutex lock;
	int range;
	u8 sample_rate_idx;
	struct iio_trigger *dready_trig;
	bool dready_trigger_on;
	/*
	 * 3 x 16-bit channels (10-bit data, 6-bit padding) +
	 * 1 x 16 padding +
	 * 4 x 16 64-bit timestamp
	 */
	s16 buffer[8];
};

#define STK8BA50_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 = 10,						\
		.storagebits = 16,					\
		.shift = STK8BA50_DATA_SHIFT,				\
		.endianness = IIO_CPU,					\
	},								\
}

static const struct iio_chan_spec stk8ba50_channels[] = {
	STK8BA50_ACCEL_CHANNEL(0, STK8BA50_REG_XOUT, X),
	STK8BA50_ACCEL_CHANNEL(1, STK8BA50_REG_YOUT, Y),
	STK8BA50_ACCEL_CHANNEL(2, STK8BA50_REG_ZOUT, Z),
	IIO_CHAN_SOFT_TIMESTAMP(3),
};

static IIO_CONST_ATTR(in_accel_scale_available, STK8BA50_SCALE_AVAIL);

static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("14 25 56 112 224 448 896 1792");

static struct attribute *stk8ba50_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 stk8ba50_attribute_group = {
	.attrs = stk8ba50_attributes
};

static int stk8ba50_read_accel(struct stk8ba50_data *data, u8 reg)
{
	int ret;
	struct i2c_client *client = data->client;

	ret = i2c_smbus_read_word_data(client, reg);
	if (ret < 0) {
		dev_err(&client->dev, "register read failed\n");
		return ret;
	}

	return ret;
}

static int stk8ba50_data_rdy_trigger_set_state(struct iio_trigger *trig,
					       bool state)
{
	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
	struct stk8ba50_data *data = iio_priv(indio_dev);
	int ret;

	if (state)
		ret = i2c_smbus_write_byte_data(data->client,
			STK8BA50_REG_INTEN2, STK8BA50_DREADY_INT_MASK);
	else
		ret = i2c_smbus_write_byte_data(data->client,
			STK8BA50_REG_INTEN2, 0x00);

	if (ret < 0)
		dev_err(&data->client->dev, "failed to set trigger state\n");
	else
		data->dready_trigger_on = state;

	return ret;
}

static const struct iio_trigger_ops stk8ba50_trigger_ops = {
	.set_trigger_state = stk8ba50_data_rdy_trigger_set_state,
	.owner = THIS_MODULE,
};

static int stk8ba50_set_power(struct stk8ba50_data *data, bool mode)
{
	int ret;
	u8 masked_reg;
	struct i2c_client *client = data->client;

	ret = i2c_smbus_read_byte_data(client, STK8BA50_REG_POWMODE);
	if (ret < 0)
		goto exit_err;

	if (mode)
		masked_reg = ret | STK8BA50_MODE_POWERBIT;
	else
		masked_reg = ret & (~STK8BA50_MODE_POWERBIT);

	ret = i2c_smbus_write_byte_data(client, STK8BA50_REG_POWMODE,
					masked_reg);
	if (ret < 0)
		goto exit_err;

	return ret;

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

static int stk8ba50_read_raw(struct iio_dev *indio_dev,
			     struct iio_chan_spec const *chan,
			     int *val, int *val2, long mask)
{
	struct stk8ba50_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 = stk8ba50_set_power(data, STK8BA50_MODE_NORMAL);
		if (ret < 0) {
			mutex_unlock(&data->lock);
			return -EINVAL;
		}
		ret = stk8ba50_read_accel(data, chan->address);
		if (ret < 0) {
			stk8ba50_set_power(data, STK8BA50_MODE_SUSPEND);
			mutex_unlock(&data->lock);
			return -EINVAL;
		}
		*val = sign_extend32(ret >> STK8BA50_DATA_SHIFT, 9);
		stk8ba50_set_power(data, STK8BA50_MODE_SUSPEND);
		mutex_unlock(&data->lock);
		return IIO_VAL_INT;
	case IIO_CHAN_INFO_SCALE:
		*val = 0;
		*val2 = stk8ba50_scale_table[data->range].scale_val;
		return IIO_VAL_INT_PLUS_MICRO;
	case IIO_CHAN_INFO_SAMP_FREQ:
		*val = stk8ba50_samp_freq_table
				[data->sample_rate_idx].samp_freq;
		*val2 = 0;
		return IIO_VAL_INT;
	}

	return -EINVAL;
}

static int stk8ba50_write_raw(struct iio_dev *indio_dev,
			      struct iio_chan_spec const *chan,
			      int val, int val2, long mask)
{
	int ret;
	int i;
	int index = -1;
	struct stk8ba50_data *data = iio_priv(indio_dev);

	switch (mask) {
	case IIO_CHAN_INFO_SCALE:
		if (val != 0)
			return -EINVAL;

		for (i = 0; i < ARRAY_SIZE(stk8ba50_scale_table); i++)
			if (val2 == stk8ba50_scale_table[i].scale_val) {
				index = i;
				break;
			}
		if (index < 0)
			return -EINVAL;

		ret = i2c_smbus_write_byte_data(data->client,
				STK8BA50_REG_RANGE,
				stk8ba50_scale_table[index].reg_val);
		if (ret < 0)
			dev_err(&data->client->dev,
					"failed to set measurement range\n");
		else
			data->range = index;

		return ret;
	case IIO_CHAN_INFO_SAMP_FREQ:
		for (i = 0; i < ARRAY_SIZE(stk8ba50_samp_freq_table); i++)
			if (val == stk8ba50_samp_freq_table[i].samp_freq) {
				index = i;
				break;
			}
		if (index < 0)
			return -EINVAL;

		ret = i2c_smbus_write_byte_data(data->client,
				STK8BA50_REG_BWSEL,
				stk8ba50_samp_freq_table[index].reg_val);
		if (ret < 0)
			dev_err(&data->client->dev,
					"failed to set sampling rate\n");
		else
			data->sample_rate_idx = index;

		return ret;
	}

	return -EINVAL;
}

static const struct iio_info stk8ba50_info = {
	.driver_module		= THIS_MODULE,
	.read_raw		= stk8ba50_read_raw,
	.write_raw		= stk8ba50_write_raw,
	.attrs			= &stk8ba50_attribute_group,
};

static irqreturn_t stk8ba50_trigger_handler(int irq, void *p)
{
	struct iio_poll_func *pf = p;
	struct iio_dev *indio_dev = pf->indio_dev;
	struct stk8ba50_data *data = iio_priv(indio_dev);
	int bit, ret, i = 0;

	mutex_lock(&data->lock);
	/*
	 * Do a bulk read if all channels are requested,
	 * from 0x02 (XOUT1) to 0x07 (ZOUT2)
	 */
	if (*(indio_dev->active_scan_mask) == STK8BA50_ALL_CHANNEL_MASK) {
		ret = i2c_smbus_read_i2c_block_data(data->client,
						    STK8BA50_REG_XOUT,
						    STK8BA50_ALL_CHANNEL_SIZE,
						    (u8 *)data->buffer);
		if (ret < STK8BA50_ALL_CHANNEL_SIZE) {
			dev_err(&data->client->dev, "register read failed\n");
			goto err;
		}
	} else {
		for_each_set_bit(bit, indio_dev->active_scan_mask,
				 indio_dev->masklength) {
			ret = stk8ba50_read_accel(data,
						  stk8ba50_channel_table[bit]);
			if (ret < 0)
				goto err;

			data->buffer[i++] = ret;
		}
	}
	iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
					   pf->timestamp);
err:
	mutex_unlock(&data->lock);
	iio_trigger_notify_done(indio_dev->trig);

	return IRQ_HANDLED;
}

static irqreturn_t stk8ba50_data_rdy_trig_poll(int irq, void *private)
{
	struct iio_dev *indio_dev = private;
	struct stk8ba50_data *data = iio_priv(indio_dev);

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

	return IRQ_HANDLED;
}

static int stk8ba50_buffer_preenable(struct iio_dev *indio_dev)
{
	struct stk8ba50_data *data = iio_priv(indio_dev);

	return stk8ba50_set_power(data, STK8BA50_MODE_NORMAL);
}

static int stk8ba50_buffer_postdisable(struct iio_dev *indio_dev)
{
	struct stk8ba50_data *data = iio_priv(indio_dev);

	return stk8ba50_set_power(data, STK8BA50_MODE_SUSPEND);
}

static const struct iio_buffer_setup_ops stk8ba50_buffer_setup_ops = {
	.preenable   = stk8ba50_buffer_preenable,
	.postenable  = iio_triggered_buffer_postenable,
	.predisable  = iio_triggered_buffer_predisable,
	.postdisable = stk8ba50_buffer_postdisable,
};

static int stk8ba50_probe(struct i2c_client *client,
			  const struct i2c_device_id *id)
{
	int ret;
	struct iio_dev *indio_dev;
	struct stk8ba50_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 = &stk8ba50_info;
	indio_dev->name = STK8BA50_DRIVER_NAME;
	indio_dev->modes = INDIO_DIRECT_MODE;
	indio_dev->channels = stk8ba50_channels;
	indio_dev->num_channels = ARRAY_SIZE(stk8ba50_channels);

	/* Reset all registers on startup */
	ret = i2c_smbus_write_byte_data(client,
			STK8BA50_REG_SWRST, STK8BA50_RESET_CMD);
	if (ret < 0) {
		dev_err(&client->dev, "failed to reset sensor\n");
		goto err_power_off;
	}

	/* The default range is +/-2g */
	data->range = 0;

	/* The default sampling rate is 1792 Hz (maximum) */
	data->sample_rate_idx = STK8BA50_SR_1792HZ_IDX;

	/* Set up interrupts */
	ret = i2c_smbus_write_byte_data(client,
			STK8BA50_REG_INTEN2, STK8BA50_DREADY_INT_MASK);
	if (ret < 0) {
		dev_err(&client->dev, "failed to set up interrupts\n");
		goto err_power_off;
	}
	ret = i2c_smbus_write_byte_data(client,
			STK8BA50_REG_INTMAP2, STK8BA50_DREADY_INT_MAP);
	if (ret < 0) {
		dev_err(&client->dev, "failed to set up interrupts\n");
		goto err_power_off;
	}

	if (client->irq > 0) {
		ret = devm_request_threaded_irq(&client->dev, client->irq,
						stk8ba50_data_rdy_trig_poll,
						NULL,
						IRQF_TRIGGER_RISING |
						IRQF_ONESHOT,
						STK8BA50_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 = &stk8ba50_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,
					 stk8ba50_trigger_handler,
					 &stk8ba50_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 ret;

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:
	stk8ba50_set_power(data, STK8BA50_MODE_SUSPEND);
	return ret;
}

static int stk8ba50_remove(struct i2c_client *client)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(client);
	struct stk8ba50_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 stk8ba50_set_power(data, STK8BA50_MODE_SUSPEND);
}

#ifdef CONFIG_PM_SLEEP
static int stk8ba50_suspend(struct device *dev)
{
	struct stk8ba50_data *data;

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

	return stk8ba50_set_power(data, STK8BA50_MODE_SUSPEND);
}

static int stk8ba50_resume(struct device *dev)
{
	struct stk8ba50_data *data;

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

	return stk8ba50_set_power(data, STK8BA50_MODE_NORMAL);
}

static SIMPLE_DEV_PM_OPS(stk8ba50_pm_ops, stk8ba50_suspend, stk8ba50_resume);

#define STK8BA50_PM_OPS (&stk8ba50_pm_ops)
#else
#define STK8BA50_PM_OPS NULL
#endif

static const struct i2c_device_id stk8ba50_i2c_id[] = {
	{"stk8ba50", 0},
	{}
};
MODULE_DEVICE_TABLE(i2c, stk8ba50_i2c_id);

static const struct acpi_device_id stk8ba50_acpi_id[] = {
	{"STK8BA50", 0},
	{}
};

MODULE_DEVICE_TABLE(acpi, stk8ba50_acpi_id);

static struct i2c_driver stk8ba50_driver = {
	.driver = {
		.name = "stk8ba50",
		.pm = STK8BA50_PM_OPS,
		.acpi_match_table = ACPI_PTR(stk8ba50_acpi_id),
	},
	.probe =            stk8ba50_probe,
	.remove =           stk8ba50_remove,
	.id_table =         stk8ba50_i2c_id,
};

module_i2c_driver(stk8ba50_driver);

MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>");
MODULE_DESCRIPTION("STK8BA50 3-Axis Accelerometer driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
884ca456 TB	1	/**
	2	* Sensortek STK8BA50 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	* STK8BA50 7-bit I2C address: 0x18.
	11	*/
	12
	13	#include <linux/acpi.h>
db6a19b8	14	#include <linux/gpio/consumer.h>
884ca456	15	#include <linux/i2c.h>
db6a19b8	16	#include <linux/interrupt.h>
884ca456 TB	17	#include <linux/kernel.h>
884ca456 TB	18	#include <linux/module.h>
db6a19b8	19	#include <linux/iio/buffer.h>
884ca456 TB	20	#include <linux/iio/iio.h>
884ca456 TB	21	#include <linux/iio/sysfs.h>
db6a19b8 TB	22	#include <linux/iio/trigger.h>
	23	#include <linux/iio/triggered_buffer.h>
	24	#include <linux/iio/trigger_consumer.h>
884ca456 TB	25
	26	#define STK8BA50_REG_XOUT 0x02
	27	#define STK8BA50_REG_YOUT 0x04
	28	#define STK8BA50_REG_ZOUT 0x06
	29	#define STK8BA50_REG_RANGE 0x0F
eb2c9ce2	30	#define STK8BA50_REG_BWSEL 0x10
884ca456 TB	31	#define STK8BA50_REG_POWMODE 0x11
884ca456 TB	32	#define STK8BA50_REG_SWRST 0x14
db6a19b8 TB	33	#define STK8BA50_REG_INTEN2 0x17
db6a19b8 TB	34	#define STK8BA50_REG_INTMAP2 0x1A
884ca456 TB	35
	36	#define STK8BA50_MODE_NORMAL 0
	37	#define STK8BA50_MODE_SUSPEND 1
	38	#define STK8BA50_MODE_POWERBIT BIT(7)
	39	#define STK8BA50_DATA_SHIFT 6
	40	#define STK8BA50_RESET_CMD 0xB6
eb2c9ce2	41	#define STK8BA50_SR_1792HZ_IDX 7
db6a19b8 TB	42	#define STK8BA50_DREADY_INT_MASK 0x10
	43	#define STK8BA50_DREADY_INT_MAP 0x81
	44	#define STK8BA50_ALL_CHANNEL_MASK 7
	45	#define STK8BA50_ALL_CHANNEL_SIZE 6
884ca456 TB	46
884ca456 TB	47	#define STK8BA50_DRIVER_NAME "stk8ba50"
db6a19b8	48	#define STK8BA50_IRQ_NAME "stk8ba50_event"
884ca456 TB	49
	50	#define STK8BA50_SCALE_AVAIL "0.0384 0.0767 0.1534 0.3069"
	51
	52	/*
	53	* The accelerometer has four measurement ranges:
	54	* +/-2g; +/-4g; +/-8g; +/-16g
	55	*
	56	* Acceleration values are 10-bit, 2's complement.
	57	* Scales are calculated as following:
	58	*
	59	* scale1 = (2 + 2) * 9.81 / (2^10 - 1) = 0.0384
	60	* scale2 = (4 + 4) * 9.81 / (2^10 - 1) = 0.0767
	61	* etc.
	62	*
	63	* Scales are stored in this format:
	64	* { <register value>, <scale value> }
	65	*
	66	* Locally, the range is stored as a table index.
	67	*/
003f4880 TB	68	static const struct {
	69	u8 reg_val;
	70	u32 scale_val;
	71	} stk8ba50_scale_table[] = {
884ca456 TB	72	{3, 38400}, {5, 76700}, {8, 153400}, {12, 306900}
	73	};
	74
eb2c9ce2 TB	75	/* Sample rates are stored as { <register value>, <Hz value> } */
	76	static const struct {
	77	u8 reg_val;
	78	u16 samp_freq;
	79	} stk8ba50_samp_freq_table[] = {
	80	{0x08, 14}, {0x09, 25}, {0x0A, 56}, {0x0B, 112},
	81	{0x0C, 224}, {0x0D, 448}, {0x0E, 896}, {0x0F, 1792}
	82	};
	83
db6a19b8 TB	84	/* Used to map scan mask bits to their corresponding channel register. */
	85	static const int stk8ba50_channel_table[] = {
	86	STK8BA50_REG_XOUT,
	87	STK8BA50_REG_YOUT,
	88	STK8BA50_REG_ZOUT
	89	};
	90
884ca456 TB	91	struct stk8ba50_data {
	92	struct i2c_client *client;
	93	struct mutex lock;
	94	int range;
eb2c9ce2	95	u8 sample_rate_idx;
db6a19b8 TB	96	struct iio_trigger *dready_trig;
	97	bool dready_trigger_on;
	98	/*
	99	* 3 x 16-bit channels (10-bit data, 6-bit padding) +
	100	* 1 x 16 padding +
	101	* 4 x 16 64-bit timestamp
	102	*/
	103	s16 buffer[8];
884ca456 TB	104	};
884ca456 TB	105
db6a19b8	106	#define STK8BA50_ACCEL_CHANNEL(index, reg, axis) { \
eb2c9ce2 TB	107	.type = IIO_ACCEL, \
	108	.address = reg, \
	109	.modified = 1, \
	110	.channel2 = IIO_MOD_##axis, \
	111	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
	112	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
	113	BIT(IIO_CHAN_INFO_SAMP_FREQ), \
db6a19b8 TB	114	.scan_index = index, \
	115	.scan_type = { \
	116	.sign = 's', \
	117	.realbits = 10, \
	118	.storagebits = 16, \
	119	.shift = STK8BA50_DATA_SHIFT, \
	120	.endianness = IIO_CPU, \
	121	}, \
884ca456 TB	122	}
	123
	124	static const struct iio_chan_spec stk8ba50_channels[] = {
db6a19b8 TB	125	STK8BA50_ACCEL_CHANNEL(0, STK8BA50_REG_XOUT, X),
	126	STK8BA50_ACCEL_CHANNEL(1, STK8BA50_REG_YOUT, Y),
	127	STK8BA50_ACCEL_CHANNEL(2, STK8BA50_REG_ZOUT, Z),
	128	IIO_CHAN_SOFT_TIMESTAMP(3),
884ca456 TB	129	};
	130
	131	static IIO_CONST_ATTR(in_accel_scale_available, STK8BA50_SCALE_AVAIL);
	132
eb2c9ce2 TB	133	static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("14 25 56 112 224 448 896 1792");
eb2c9ce2 TB	134
884ca456 TB	135	static struct attribute *stk8ba50_attributes[] = {
884ca456 TB	136	&iio_const_attr_in_accel_scale_available.dev_attr.attr,
eb2c9ce2	137	&iio_const_attr_sampling_frequency_available.dev_attr.attr,
884ca456 TB	138	NULL,
	139	};
	140
	141	static const struct attribute_group stk8ba50_attribute_group = {
	142	.attrs = stk8ba50_attributes
	143	};
	144
	145	static int stk8ba50_read_accel(struct stk8ba50_data *data, u8 reg)
	146	{
	147	int ret;
	148	struct i2c_client *client = data->client;
	149
	150	ret = i2c_smbus_read_word_data(client, reg);
	151	if (ret < 0) {
	152	dev_err(&client->dev, "register read failed\n");
	153	return ret;
	154	}
	155
db6a19b8 TB	156	return ret;
	157	}
	158
	159	static int stk8ba50_data_rdy_trigger_set_state(struct iio_trigger *trig,
	160	bool state)
	161	{
	162	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
	163	struct stk8ba50_data *data = iio_priv(indio_dev);
	164	int ret;
	165
	166	if (state)
	167	ret = i2c_smbus_write_byte_data(data->client,
	168	STK8BA50_REG_INTEN2, STK8BA50_DREADY_INT_MASK);
	169	else
	170	ret = i2c_smbus_write_byte_data(data->client,
	171	STK8BA50_REG_INTEN2, 0x00);
	172
	173	if (ret < 0)
	174	dev_err(&data->client->dev, "failed to set trigger state\n");
	175	else
	176	data->dready_trigger_on = state;
	177
	178	return ret;
	179	}
	180
	181	static const struct iio_trigger_ops stk8ba50_trigger_ops = {
	182	.set_trigger_state = stk8ba50_data_rdy_trigger_set_state,
	183	.owner = THIS_MODULE,
	184	};
	185
	186	static int stk8ba50_set_power(struct stk8ba50_data *data, bool mode)
	187	{
	188	int ret;
	189	u8 masked_reg;
	190	struct i2c_client *client = data->client;
	191
	192	ret = i2c_smbus_read_byte_data(client, STK8BA50_REG_POWMODE);
	193	if (ret < 0)
	194	goto exit_err;
	195
	196	if (mode)
	197	masked_reg = ret \| STK8BA50_MODE_POWERBIT;
	198	else
	199	masked_reg = ret & (~STK8BA50_MODE_POWERBIT);
	200
	201	ret = i2c_smbus_write_byte_data(client, STK8BA50_REG_POWMODE,
	202	masked_reg);
	203	if (ret < 0)
	204	goto exit_err;
	205
	206	return ret;
	207
	208	exit_err:
	209	dev_err(&client->dev, "failed to change sensor mode\n");
	210	return ret;
884ca456 TB	211	}
	212
	213	static int stk8ba50_read_raw(struct iio_dev *indio_dev,
	214	struct iio_chan_spec const *chan,
	215	int val, int val2, long mask)
	216	{
	217	struct stk8ba50_data *data = iio_priv(indio_dev);
db6a19b8	218	int ret;
884ca456 TB	219
	220	switch (mask) {
	221	case IIO_CHAN_INFO_RAW:
db6a19b8 TB	222	if (iio_buffer_enabled(indio_dev))
db6a19b8 TB	223	return -EBUSY;
884ca456	224	mutex_lock(&data->lock);
db6a19b8 TB	225	ret = stk8ba50_set_power(data, STK8BA50_MODE_NORMAL);
	226	if (ret < 0) {
	227	mutex_unlock(&data->lock);
	228	return -EINVAL;
	229	}
	230	ret = stk8ba50_read_accel(data, chan->address);
	231	if (ret < 0) {
	232	stk8ba50_set_power(data, STK8BA50_MODE_SUSPEND);
	233	mutex_unlock(&data->lock);
	234	return -EINVAL;
	235	}
	236	*val = sign_extend32(ret >> STK8BA50_DATA_SHIFT, 9);
	237	stk8ba50_set_power(data, STK8BA50_MODE_SUSPEND);
884ca456 TB	238	mutex_unlock(&data->lock);
	239	return IIO_VAL_INT;
	240	case IIO_CHAN_INFO_SCALE:
	241	*val = 0;
003f4880	242	*val2 = stk8ba50_scale_table[data->range].scale_val;
884ca456	243	return IIO_VAL_INT_PLUS_MICRO;
eb2c9ce2 TB	244	case IIO_CHAN_INFO_SAMP_FREQ:
	245	*val = stk8ba50_samp_freq_table
	246	[data->sample_rate_idx].samp_freq;
	247	*val2 = 0;
	248	return IIO_VAL_INT;
884ca456 TB	249	}
	250
	251	return -EINVAL;
	252	}
	253
	254	static int stk8ba50_write_raw(struct iio_dev *indio_dev,
	255	struct iio_chan_spec const *chan,
	256	int val, int val2, long mask)
	257	{
	258	int ret;
	259	int i;
	260	int index = -1;
	261	struct stk8ba50_data *data = iio_priv(indio_dev);
	262
	263	switch (mask) {
	264	case IIO_CHAN_INFO_SCALE:
	265	if (val != 0)
	266	return -EINVAL;
	267
	268	for (i = 0; i < ARRAY_SIZE(stk8ba50_scale_table); i++)
003f4880	269	if (val2 == stk8ba50_scale_table[i].scale_val) {
884ca456 TB	270	index = i;
	271	break;
	272	}
	273	if (index < 0)
	274	return -EINVAL;
	275
	276	ret = i2c_smbus_write_byte_data(data->client,
	277	STK8BA50_REG_RANGE,
003f4880	278	stk8ba50_scale_table[index].reg_val);
884ca456 TB	279	if (ret < 0)
	280	dev_err(&data->client->dev,
	281	"failed to set measurement range\n");
	282	else
	283	data->range = index;
	284
eb2c9ce2 TB	285	return ret;
	286	case IIO_CHAN_INFO_SAMP_FREQ:
	287	for (i = 0; i < ARRAY_SIZE(stk8ba50_samp_freq_table); i++)
	288	if (val == stk8ba50_samp_freq_table[i].samp_freq) {
	289	index = i;
	290	break;
	291	}
	292	if (index < 0)
	293	return -EINVAL;
	294
	295	ret = i2c_smbus_write_byte_data(data->client,
	296	STK8BA50_REG_BWSEL,
	297	stk8ba50_samp_freq_table[index].reg_val);
	298	if (ret < 0)
	299	dev_err(&data->client->dev,
	300	"failed to set sampling rate\n");
	301	else
	302	data->sample_rate_idx = index;
	303
884ca456 TB	304	return ret;
	305	}
	306
	307	return -EINVAL;
	308	}
	309
	310	static const struct iio_info stk8ba50_info = {
	311	.driver_module = THIS_MODULE,
	312	.read_raw = stk8ba50_read_raw,
	313	.write_raw = stk8ba50_write_raw,
	314	.attrs = &stk8ba50_attribute_group,
	315	};
	316
db6a19b8 TB	317	static irqreturn_t stk8ba50_trigger_handler(int irq, void *p)
	318	{
	319	struct iio_poll_func *pf = p;
	320	struct iio_dev *indio_dev = pf->indio_dev;
	321	struct stk8ba50_data *data = iio_priv(indio_dev);
	322	int bit, ret, i = 0;
	323
	324	mutex_lock(&data->lock);
	325	/*
	326	* Do a bulk read if all channels are requested,
	327	* from 0x02 (XOUT1) to 0x07 (ZOUT2)
	328	*/
	329	if (*(indio_dev->active_scan_mask) == STK8BA50_ALL_CHANNEL_MASK) {
	330	ret = i2c_smbus_read_i2c_block_data(data->client,
	331	STK8BA50_REG_XOUT,
	332	STK8BA50_ALL_CHANNEL_SIZE,
	333	(u8 *)data->buffer);
	334	if (ret < STK8BA50_ALL_CHANNEL_SIZE) {
	335	dev_err(&data->client->dev, "register read failed\n");
	336	goto err;
	337	}
	338	} else {
	339	for_each_set_bit(bit, indio_dev->active_scan_mask,
	340	indio_dev->masklength) {
	341	ret = stk8ba50_read_accel(data,
	342	stk8ba50_channel_table[bit]);
	343	if (ret < 0)
	344	goto err;
	345
	346	data->buffer[i++] = ret;
	347	}
	348	}
	349	iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
	350	pf->timestamp);
	351	err:
	352	mutex_unlock(&data->lock);
	353	iio_trigger_notify_done(indio_dev->trig);
	354
	355	return IRQ_HANDLED;
	356	}
	357
	358	static irqreturn_t stk8ba50_data_rdy_trig_poll(int irq, void *private)
	359	{
	360	struct iio_dev *indio_dev = private;
	361	struct stk8ba50_data *data = iio_priv(indio_dev);
	362
	363	if (data->dready_trigger_on)
	364	iio_trigger_poll(data->dready_trig);
	365
	366	return IRQ_HANDLED;
	367	}
	368
	369	static int stk8ba50_buffer_preenable(struct iio_dev *indio_dev)
	370	{
	371	struct stk8ba50_data *data = iio_priv(indio_dev);
	372
	373	return stk8ba50_set_power(data, STK8BA50_MODE_NORMAL);
	374	}
	375
	376	static int stk8ba50_buffer_postdisable(struct iio_dev *indio_dev)
	377	{
	378	struct stk8ba50_data *data = iio_priv(indio_dev);
	379
	380	return stk8ba50_set_power(data, STK8BA50_MODE_SUSPEND);
381	}
382
383	static const struct iio_buffer_setup_ops stk8ba50_buffer_setup_ops = {
384	.preenable = stk8ba50_buffer_preenable,
385	.postenable = iio_triggered_buffer_postenable,
386	.predisable = iio_triggered_buffer_predisable,
387	.postdisable = stk8ba50_buffer_postdisable,
388	};
389
884ca456 TB	390	static int stk8ba50_probe(struct i2c_client *client,
	391	const struct i2c_device_id *id)
	392	{
	393	int ret;
	394	struct iio_dev *indio_dev;
	395	struct stk8ba50_data *data;
	396
	397	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
	398	if (!indio_dev) {
	399	dev_err(&client->dev, "iio allocation failed!\n");
	400	return -ENOMEM;
	401	}
	402
	403	data = iio_priv(indio_dev);
	404	data->client = client;
	405	i2c_set_clientdata(client, indio_dev);
	406	mutex_init(&data->lock);
	407
	408	indio_dev->dev.parent = &client->dev;
	409	indio_dev->info = &stk8ba50_info;
	410	indio_dev->name = STK8BA50_DRIVER_NAME;
	411	indio_dev->modes = INDIO_DIRECT_MODE;
	412	indio_dev->channels = stk8ba50_channels;
	413	indio_dev->num_channels = ARRAY_SIZE(stk8ba50_channels);
	414
	415	/* Reset all registers on startup */
	416	ret = i2c_smbus_write_byte_data(client,
	417	STK8BA50_REG_SWRST, STK8BA50_RESET_CMD);
	418	if (ret < 0) {
	419	dev_err(&client->dev, "failed to reset sensor\n");
db42a9be	420	goto err_power_off;
884ca456 TB	421	}
	422
	423	/* The default range is +/-2g */
	424	data->range = 0;
	425
eb2c9ce2 TB	426	/* The default sampling rate is 1792 Hz (maximum) */
	427	data->sample_rate_idx = STK8BA50_SR_1792HZ_IDX;
	428
db6a19b8 TB	429	/* Set up interrupts */
	430	ret = i2c_smbus_write_byte_data(client,
	431	STK8BA50_REG_INTEN2, STK8BA50_DREADY_INT_MASK);
	432	if (ret < 0) {
	433	dev_err(&client->dev, "failed to set up interrupts\n");
	434	goto err_power_off;
	435	}
	436	ret = i2c_smbus_write_byte_data(client,
	437	STK8BA50_REG_INTMAP2, STK8BA50_DREADY_INT_MAP);
	438	if (ret < 0) {
	439	dev_err(&client->dev, "failed to set up interrupts\n");
	440	goto err_power_off;
	441	}
	442
6839c1b0	443	if (client->irq > 0) {
db6a19b8 TB	444	ret = devm_request_threaded_irq(&client->dev, client->irq,
	445	stk8ba50_data_rdy_trig_poll,
	446	NULL,
	447	IRQF_TRIGGER_RISING \|
	448	IRQF_ONESHOT,
	449	STK8BA50_IRQ_NAME,
	450	indio_dev);
	451	if (ret < 0) {
	452	dev_err(&client->dev, "request irq %d failed\n",
	453	client->irq);
	454	goto err_power_off;
	455	}
	456
	457	data->dready_trig = devm_iio_trigger_alloc(&client->dev,
	458	"%s-dev%d",
	459	indio_dev->name,
	460	indio_dev->id);
	461	if (!data->dready_trig) {
	462	ret = -ENOMEM;
	463	goto err_power_off;
	464	}
	465
	466	data->dready_trig->dev.parent = &client->dev;
	467	data->dready_trig->ops = &stk8ba50_trigger_ops;
	468	iio_trigger_set_drvdata(data->dready_trig, indio_dev);
	469	ret = iio_trigger_register(data->dready_trig);
	470	if (ret) {
	471	dev_err(&client->dev, "iio trigger register failed\n");
	472	goto err_power_off;
	473	}
	474	}
	475
	476	ret = iio_triggered_buffer_setup(indio_dev,
	477	iio_pollfunc_store_time,
	478	stk8ba50_trigger_handler,
	479	&stk8ba50_buffer_setup_ops);
	480	if (ret < 0) {
	481	dev_err(&client->dev, "iio triggered buffer setup failed\n");
	482	goto err_trigger_unregister;
	483	}
	484
884ca456 TB	485	ret = iio_device_register(indio_dev);
	486	if (ret < 0) {
	487	dev_err(&client->dev, "device_register failed\n");
db6a19b8	488	goto err_buffer_cleanup;
884ca456 TB	489	}
	490
	491	return ret;
db42a9be	492
db6a19b8 TB	493	err_buffer_cleanup:
	494	iio_triggered_buffer_cleanup(indio_dev);
	495	err_trigger_unregister:
	496	if (data->dready_trig)
	497	iio_trigger_unregister(data->dready_trig);
db42a9be TB	498	err_power_off:
	499	stk8ba50_set_power(data, STK8BA50_MODE_SUSPEND);
	500	return ret;
884ca456 TB	501	}
	502
	503	static int stk8ba50_remove(struct i2c_client *client)
	504	{
	505	struct iio_dev *indio_dev = i2c_get_clientdata(client);
db6a19b8	506	struct stk8ba50_data *data = iio_priv(indio_dev);
884ca456 TB	507
884ca456 TB	508	iio_device_unregister(indio_dev);
db6a19b8 TB	509	iio_triggered_buffer_cleanup(indio_dev);
	510
	511	if (data->dready_trig)
	512	iio_trigger_unregister(data->dready_trig);
884ca456	513
db6a19b8	514	return stk8ba50_set_power(data, STK8BA50_MODE_SUSPEND);
884ca456 TB	515	}
	516
	517	#ifdef CONFIG_PM_SLEEP
	518	static int stk8ba50_suspend(struct device *dev)
	519	{
	520	struct stk8ba50_data *data;
	521
	522	data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
	523
	524	return stk8ba50_set_power(data, STK8BA50_MODE_SUSPEND);
	525	}
	526
	527	static int stk8ba50_resume(struct device *dev)
	528	{
	529	struct stk8ba50_data *data;
	530
	531	data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
	532
	533	return stk8ba50_set_power(data, STK8BA50_MODE_NORMAL);
	534	}
	535
	536	static SIMPLE_DEV_PM_OPS(stk8ba50_pm_ops, stk8ba50_suspend, stk8ba50_resume);
	537
	538	#define STK8BA50_PM_OPS (&stk8ba50_pm_ops)
	539	#else
	540	#define STK8BA50_PM_OPS NULL
	541	#endif
	542
	543	static const struct i2c_device_id stk8ba50_i2c_id[] = {
	544	{"stk8ba50", 0},
	545	{}
	546	};
58e446fc	547	MODULE_DEVICE_TABLE(i2c, stk8ba50_i2c_id);
884ca456 TB	548
	549	static const struct acpi_device_id stk8ba50_acpi_id[] = {
	550	{"STK8BA50", 0},
	551	{}
	552	};
	553
	554	MODULE_DEVICE_TABLE(acpi, stk8ba50_acpi_id);
	555
	556	static struct i2c_driver stk8ba50_driver = {
	557	.driver = {
	558	.name = "stk8ba50",
	559	.pm = STK8BA50_PM_OPS,
	560	.acpi_match_table = ACPI_PTR(stk8ba50_acpi_id),
	561	},
	562	.probe = stk8ba50_probe,
	563	.remove = stk8ba50_remove,
	564	.id_table = stk8ba50_i2c_id,
	565	};
	566
	567	module_i2c_driver(stk8ba50_driver);
	568
	569	MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>");
	570	MODULE_DESCRIPTION("STK8BA50 3-Axis Accelerometer driver");
	571	MODULE_LICENSE("GPL v2");