[mirror_ubuntu-artful-kernel.git] / drivers / iio / pressure / st_pressure_core.c

/*
 * STMicroelectronics pressures driver
 *
 * Copyright 2013 STMicroelectronics Inc.
 *
 * Denis Ciocca <denis.ciocca@st.com>
 *
 * Licensed under the GPL-2.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/mutex.h>
#include <linux/interrupt.h>
#include <linux/i2c.h>
#include <linux/gpio.h>
#include <linux/irq.h>
#include <linux/delay.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/trigger.h>
#include <linux/iio/buffer.h>
#include <asm/unaligned.h>

#include <linux/iio/common/st_sensors.h>
#include "st_pressure.h"

/*
 * About determining pressure scaling factors
 * ------------------------------------------
 *
 * Datasheets specify typical pressure sensitivity so that pressure is computed
 * according to the following equation :
 *     pressure[mBar] = raw / sensitivity
 * where :
 *     raw          the 24 bits long raw sampled pressure
 *     sensitivity  a scaling factor specified by the datasheet in LSB/mBar
 *
 * IIO ABI expects pressure to be expressed as kPascal, hence pressure should be
 * computed according to :
 *     pressure[kPascal] = pressure[mBar] / 10
 *                       = raw / (sensitivity * 10)                          (1)
 *
 * Finally, st_press_read_raw() returns pressure scaling factor as an
 * IIO_VAL_INT_PLUS_NANO with a zero integral part and "gain" as decimal part.
 * Therefore, from (1), "gain" becomes :
 *     gain = 10^9 / (sensitivity * 10)
 *          = 10^8 / sensitivity
 *
 * About determining temperature scaling factors and offsets
 * ---------------------------------------------------------
 *
 * Datasheets specify typical temperature sensitivity and offset so that
 * temperature is computed according to the following equation :
 *     temp[Celsius] = offset[Celsius] + (raw / sensitivity)
 * where :
 *     raw          the 16 bits long raw sampled temperature
 *     offset       a constant specified by the datasheet in degree Celsius
 *                  (sometimes zero)
 *     sensitivity  a scaling factor specified by the datasheet in LSB/Celsius
 *
 * IIO ABI expects temperature to be expressed as milli degree Celsius such as
 * user space should compute temperature according to :
 *     temp[mCelsius] = temp[Celsius] * 10^3
 *                    = (offset[Celsius] + (raw / sensitivity)) * 10^3
 *                    = ((offset[Celsius] * sensitivity) + raw) *
 *                      (10^3 / sensitivity)                                 (2)
 *
 * IIO ABI expects user space to apply offset and scaling factors to raw samples
 * according to :
 *     temp[mCelsius] = (OFFSET + raw) * SCALE
 * where :
 *     OFFSET an arbitrary constant exposed by device
 *     SCALE  an arbitrary scaling factor exposed by device
 *
 * Matching OFFSET and SCALE with members of (2) gives :
 *     OFFSET = offset[Celsius] * sensitivity                                (3)
 *     SCALE  = 10^3 / sensitivity                                           (4)
 *
 * st_press_read_raw() returns temperature scaling factor as an
 * IIO_VAL_FRACTIONAL with a 10^3 numerator and "gain2" as denominator.
 * Therefore, from (3), "gain2" becomes :
 *     gain2 = sensitivity
 *
 * When declared within channel, i.e. for a non zero specified offset,
 * st_press_read_raw() will return the latter as an IIO_VAL_FRACTIONAL such as :
 *     numerator = OFFSET * 10^3
 *     denominator = 10^3
 * giving from (4):
 *     numerator = offset[Celsius] * 10^3 * sensitivity
 *               = offset[mCelsius] * gain2
 */

#define MCELSIUS_PER_CELSIUS			1000

/* Default pressure sensitivity */
#define ST_PRESS_LSB_PER_MBAR			4096UL
#define ST_PRESS_KPASCAL_NANO_SCALE		(100000000UL / \
						 ST_PRESS_LSB_PER_MBAR)

/* Default temperature sensitivity */
#define ST_PRESS_LSB_PER_CELSIUS		480UL
#define ST_PRESS_MILLI_CELSIUS_OFFSET		42500UL

/* FULLSCALE */
#define ST_PRESS_FS_AVL_1100MB			1100
#define ST_PRESS_FS_AVL_1260MB			1260

#define ST_PRESS_1_OUT_XL_ADDR			0x28
#define ST_TEMP_1_OUT_L_ADDR			0x2b

/* LPS001WP pressure resolution */
#define ST_PRESS_LPS001WP_LSB_PER_MBAR		16UL
/* LPS001WP temperature resolution */
#define ST_PRESS_LPS001WP_LSB_PER_CELSIUS	64UL
/* LPS001WP pressure gain */
#define ST_PRESS_LPS001WP_FS_AVL_PRESS_GAIN \
	(100000000UL / ST_PRESS_LPS001WP_LSB_PER_MBAR)
/* LPS001WP pressure and temp L addresses */
#define ST_PRESS_LPS001WP_OUT_L_ADDR		0x28
#define ST_TEMP_LPS001WP_OUT_L_ADDR		0x2a

/* LPS25H pressure and temp L addresses */
#define ST_PRESS_LPS25H_OUT_XL_ADDR		0x28
#define ST_TEMP_LPS25H_OUT_L_ADDR		0x2b

/* LPS22HB temperature sensitivity */
#define ST_PRESS_LPS22HB_LSB_PER_CELSIUS	100UL

static const struct iio_chan_spec st_press_1_channels[] = {
	{
		.type = IIO_PRESSURE,
		.address = ST_PRESS_1_OUT_XL_ADDR,
		.scan_index = 0,
		.scan_type = {
			.sign = 's',
			.realbits = 24,
			.storagebits = 32,
			.endianness = IIO_LE,
		},
		.info_mask_separate =
			BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
	},
	{
		.type = IIO_TEMP,
		.address = ST_TEMP_1_OUT_L_ADDR,
		.scan_index = 1,
		.scan_type = {
			.sign = 's',
			.realbits = 16,
			.storagebits = 16,
			.endianness = IIO_LE,
		},
		.info_mask_separate =
			BIT(IIO_CHAN_INFO_RAW) |
			BIT(IIO_CHAN_INFO_SCALE) |
			BIT(IIO_CHAN_INFO_OFFSET),
		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
	},
	IIO_CHAN_SOFT_TIMESTAMP(2)
};

static const struct iio_chan_spec st_press_lps001wp_channels[] = {
	{
		.type = IIO_PRESSURE,
		.address = ST_PRESS_LPS001WP_OUT_L_ADDR,
		.scan_index = 0,
		.scan_type = {
			.sign = 's',
			.realbits = 16,
			.storagebits = 16,
			.endianness = IIO_LE,
		},
		.info_mask_separate =
			BIT(IIO_CHAN_INFO_RAW) |
			BIT(IIO_CHAN_INFO_SCALE),
	},
	{
		.type = IIO_TEMP,
		.address = ST_TEMP_LPS001WP_OUT_L_ADDR,
		.scan_index = 1,
		.scan_type = {
			.sign = 's',
			.realbits = 16,
			.storagebits = 16,
			.endianness = IIO_LE,
		},
		.info_mask_separate =
			BIT(IIO_CHAN_INFO_RAW) |
			BIT(IIO_CHAN_INFO_SCALE),
	},
	IIO_CHAN_SOFT_TIMESTAMP(2)
};

static const struct iio_chan_spec st_press_lps22hb_channels[] = {
	{
		.type = IIO_PRESSURE,
		.address = ST_PRESS_1_OUT_XL_ADDR,
		.scan_index = 0,
		.scan_type = {
			.sign = 's',
			.realbits = 24,
			.storagebits = 32,
			.endianness = IIO_LE,
		},
		.info_mask_separate =
			BIT(IIO_CHAN_INFO_RAW) |
			BIT(IIO_CHAN_INFO_SCALE),
		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
	},
	{
		.type = IIO_TEMP,
		.address = ST_TEMP_1_OUT_L_ADDR,
		.scan_index = 1,
		.scan_type = {
			.sign = 's',
			.realbits = 16,
			.storagebits = 16,
			.endianness = IIO_LE,
		},
		.info_mask_separate =
			BIT(IIO_CHAN_INFO_RAW) |
			BIT(IIO_CHAN_INFO_SCALE),
		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
	},
	IIO_CHAN_SOFT_TIMESTAMP(2)
};

static const struct st_sensor_settings st_press_sensors_settings[] = {
	{
		/*
		 * CUSTOM VALUES FOR LPS331AP SENSOR
		 * See LPS331AP datasheet:
		 * http://www2.st.com/resource/en/datasheet/lps331ap.pdf
		 */
		.wai = 0xbb,
		.wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
		.sensors_supported = {
			[0] = LPS331AP_PRESS_DEV_NAME,
		},
		.ch = (struct iio_chan_spec *)st_press_1_channels,
		.num_ch = ARRAY_SIZE(st_press_1_channels),
		.odr = {
			.addr = 0x20,
			.mask = 0x70,
			.odr_avl = {
				{ .hz = 1, .value = 0x01 },
				{ .hz = 7, .value = 0x05 },
				{ .hz = 13, .value = 0x06 },
				{ .hz = 25, .value = 0x07 },
			},
		},
		.pw = {
			.addr = 0x20,
			.mask = 0x80,
			.value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
			.value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
		},
		.fs = {
			.addr = 0x23,
			.mask = 0x30,
			.fs_avl = {
				/*
				 * Pressure and temperature sensitivity values
				 * as defined in table 3 of LPS331AP datasheet.
				 */
				[0] = {
					.num = ST_PRESS_FS_AVL_1260MB,
					.gain = ST_PRESS_KPASCAL_NANO_SCALE,
					.gain2 = ST_PRESS_LSB_PER_CELSIUS,
				},
			},
		},
		.bdu = {
			.addr = 0x20,
			.mask = 0x04,
		},
		.drdy_irq = {
			.addr = 0x22,
			.mask_int1 = 0x04,
			.mask_int2 = 0x20,
			.addr_ihl = 0x22,
			.mask_ihl = 0x80,
			.addr_od = 0x22,
			.mask_od = 0x40,
			.addr_stat_drdy = ST_SENSORS_DEFAULT_STAT_ADDR,
		},
		.multi_read_bit = true,
		.bootime = 2,
	},
	{
		/*
		 * CUSTOM VALUES FOR LPS001WP SENSOR
		 */
		.wai = 0xba,
		.wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
		.sensors_supported = {
			[0] = LPS001WP_PRESS_DEV_NAME,
		},
		.ch = (struct iio_chan_spec *)st_press_lps001wp_channels,
		.num_ch = ARRAY_SIZE(st_press_lps001wp_channels),
		.odr = {
			.addr = 0x20,
			.mask = 0x30,
			.odr_avl = {
				{ .hz = 1, .value = 0x01 },
				{ .hz = 7, .value = 0x02 },
				{ .hz = 13, .value = 0x03 },
			},
		},
		.pw = {
			.addr = 0x20,
			.mask = 0x40,
			.value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
			.value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
		},
		.fs = {
			.fs_avl = {
				/*
				 * Pressure and temperature resolution values
				 * as defined in table 3 of LPS001WP datasheet.
				 */
				[0] = {
					.num = ST_PRESS_FS_AVL_1100MB,
					.gain = ST_PRESS_LPS001WP_FS_AVL_PRESS_GAIN,
					.gain2 = ST_PRESS_LPS001WP_LSB_PER_CELSIUS,
				},
			},
		},
		.bdu = {
			.addr = 0x20,
			.mask = 0x04,
		},
		.drdy_irq = {
			.addr = 0,
		},
		.multi_read_bit = true,
		.bootime = 2,
	},
	{
		/*
		 * CUSTOM VALUES FOR LPS25H SENSOR
		 * See LPS25H datasheet:
		 * http://www2.st.com/resource/en/datasheet/lps25h.pdf
		 */
		.wai = 0xbd,
		.wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
		.sensors_supported = {
			[0] = LPS25H_PRESS_DEV_NAME,
		},
		.ch = (struct iio_chan_spec *)st_press_1_channels,
		.num_ch = ARRAY_SIZE(st_press_1_channels),
		.odr = {
			.addr = 0x20,
			.mask = 0x70,
			.odr_avl = {
				{ .hz = 1, .value = 0x01 },
				{ .hz = 7, .value = 0x02 },
				{ .hz = 13, .value = 0x03 },
				{ .hz = 25, .value = 0x04 },
			},
		},
		.pw = {
			.addr = 0x20,
			.mask = 0x80,
			.value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
			.value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
		},
		.fs = {
			.fs_avl = {
				/*
				 * Pressure and temperature sensitivity values
				 * as defined in table 3 of LPS25H datasheet.
				 */
				[0] = {
					.num = ST_PRESS_FS_AVL_1260MB,
					.gain = ST_PRESS_KPASCAL_NANO_SCALE,
					.gain2 = ST_PRESS_LSB_PER_CELSIUS,
				},
			},
		},
		.bdu = {
			.addr = 0x20,
			.mask = 0x04,
		},
		.drdy_irq = {
			.addr = 0x23,
			.mask_int1 = 0x01,
			.mask_int2 = 0x10,
			.addr_ihl = 0x22,
			.mask_ihl = 0x80,
			.addr_od = 0x22,
			.mask_od = 0x40,
			.addr_stat_drdy = ST_SENSORS_DEFAULT_STAT_ADDR,
		},
		.multi_read_bit = true,
		.bootime = 2,
	},
	{
		/*
		 * CUSTOM VALUES FOR LPS22HB SENSOR
		 * See LPS22HB datasheet:
		 * http://www2.st.com/resource/en/datasheet/lps22hb.pdf
		 */
		.wai = 0xb1,
		.wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
		.sensors_supported = {
			[0] = LPS22HB_PRESS_DEV_NAME,
		},
		.ch = (struct iio_chan_spec *)st_press_lps22hb_channels,
		.num_ch = ARRAY_SIZE(st_press_lps22hb_channels),
		.odr = {
			.addr = 0x10,
			.mask = 0x70,
			.odr_avl = {
				{ .hz = 1, .value = 0x01 },
				{ .hz = 10, .value = 0x02 },
				{ .hz = 25, .value = 0x03 },
				{ .hz = 50, .value = 0x04 },
				{ .hz = 75, .value = 0x05 },
			},
		},
		.pw = {
			.addr = 0x10,
			.mask = 0x70,
			.value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
		},
		.fs = {
			.fs_avl = {
				/*
				 * Pressure and temperature sensitivity values
				 * as defined in table 3 of LPS22HB datasheet.
				 */
				[0] = {
					.num = ST_PRESS_FS_AVL_1260MB,
					.gain = ST_PRESS_KPASCAL_NANO_SCALE,
					.gain2 = ST_PRESS_LPS22HB_LSB_PER_CELSIUS,
				},
			},
		},
		.bdu = {
			.addr = 0x10,
			.mask = 0x02,
		},
		.drdy_irq = {
			.addr = 0x12,
			.mask_int1 = 0x04,
			.mask_int2 = 0x08,
			.addr_ihl = 0x12,
			.mask_ihl = 0x80,
			.addr_od = 0x12,
			.mask_od = 0x40,
			.addr_stat_drdy = ST_SENSORS_DEFAULT_STAT_ADDR,
		},
		.multi_read_bit = false,
		.bootime = 2,
	},
};

static int st_press_write_raw(struct iio_dev *indio_dev,
			      struct iio_chan_spec const *ch,
			      int val,
			      int val2,
			      long mask)
{
	int err;

	switch (mask) {
	case IIO_CHAN_INFO_SAMP_FREQ:
		if (val2)
			return -EINVAL;
		mutex_lock(&indio_dev->mlock);
		err = st_sensors_set_odr(indio_dev, val);
		mutex_unlock(&indio_dev->mlock);
		return err;
	default:
		return -EINVAL;
	}
}

static int st_press_read_raw(struct iio_dev *indio_dev,
			struct iio_chan_spec const *ch, int *val,
							int *val2, long mask)
{
	int err;
	struct st_sensor_data *press_data = iio_priv(indio_dev);

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		err = st_sensors_read_info_raw(indio_dev, ch, val);
		if (err < 0)
			goto read_error;

		return IIO_VAL_INT;
	case IIO_CHAN_INFO_SCALE:
		switch (ch->type) {
		case IIO_PRESSURE:
			*val = 0;
			*val2 = press_data->current_fullscale->gain;
			return IIO_VAL_INT_PLUS_NANO;
		case IIO_TEMP:
			*val = MCELSIUS_PER_CELSIUS;
			*val2 = press_data->current_fullscale->gain2;
			return IIO_VAL_FRACTIONAL;
		default:
			err = -EINVAL;
			goto read_error;
		}

	case IIO_CHAN_INFO_OFFSET:
		switch (ch->type) {
		case IIO_TEMP:
			*val = ST_PRESS_MILLI_CELSIUS_OFFSET *
			       press_data->current_fullscale->gain2;
			*val2 = MCELSIUS_PER_CELSIUS;
			break;
		default:
			err = -EINVAL;
			goto read_error;
		}

		return IIO_VAL_FRACTIONAL;
	case IIO_CHAN_INFO_SAMP_FREQ:
		*val = press_data->odr;
		return IIO_VAL_INT;
	default:
		return -EINVAL;
	}

read_error:
	return err;
}

static ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL();

static struct attribute *st_press_attributes[] = {
	&iio_dev_attr_sampling_frequency_available.dev_attr.attr,
	NULL,
};

static const struct attribute_group st_press_attribute_group = {
	.attrs = st_press_attributes,
};

static const struct iio_info press_info = {
	.driver_module = THIS_MODULE,
	.attrs = &st_press_attribute_group,
	.read_raw = &st_press_read_raw,
	.write_raw = &st_press_write_raw,
	.debugfs_reg_access = &st_sensors_debugfs_reg_access,
};

#ifdef CONFIG_IIO_TRIGGER
static const struct iio_trigger_ops st_press_trigger_ops = {
	.owner = THIS_MODULE,
	.set_trigger_state = ST_PRESS_TRIGGER_SET_STATE,
	.validate_device = st_sensors_validate_device,
};
#define ST_PRESS_TRIGGER_OPS (&st_press_trigger_ops)
#else
#define ST_PRESS_TRIGGER_OPS NULL
#endif

int st_press_common_probe(struct iio_dev *indio_dev)
{
	struct st_sensor_data *press_data = iio_priv(indio_dev);
	struct st_sensors_platform_data *pdata =
		(struct st_sensors_platform_data *)press_data->dev->platform_data;
	int irq = press_data->get_irq_data_ready(indio_dev);
	int err;

	indio_dev->modes = INDIO_DIRECT_MODE;
	indio_dev->info = &press_info;
	mutex_init(&press_data->tb.buf_lock);

	err = st_sensors_power_enable(indio_dev);
	if (err)
		return err;

	err = st_sensors_check_device_support(indio_dev,
					ARRAY_SIZE(st_press_sensors_settings),
					st_press_sensors_settings);
	if (err < 0)
		goto st_press_power_off;

	/*
	 * Skip timestamping channel while declaring available channels to
	 * common st_sensor layer. Look at st_sensors_get_buffer_element() to
	 * see how timestamps are explicitly pushed as last samples block
	 * element.
	 */
	press_data->num_data_channels = press_data->sensor_settings->num_ch - 1;
	press_data->multiread_bit = press_data->sensor_settings->multi_read_bit;
	indio_dev->channels = press_data->sensor_settings->ch;
	indio_dev->num_channels = press_data->sensor_settings->num_ch;

	press_data->current_fullscale =
		(struct st_sensor_fullscale_avl *)
			&press_data->sensor_settings->fs.fs_avl[0];

	press_data->odr = press_data->sensor_settings->odr.odr_avl[0].hz;

	/* Some devices don't support a data ready pin. */
	if (!pdata && press_data->sensor_settings->drdy_irq.addr)
		pdata =	(struct st_sensors_platform_data *)&default_press_pdata;

	err = st_sensors_init_sensor(indio_dev, press_data->dev->platform_data);
	if (err < 0)
		goto st_press_power_off;

	err = st_press_allocate_ring(indio_dev);
	if (err < 0)
		goto st_press_power_off;

	if (irq > 0) {
		err = st_sensors_allocate_trigger(indio_dev,
						  ST_PRESS_TRIGGER_OPS);
		if (err < 0)
			goto st_press_probe_trigger_error;
	}

	err = iio_device_register(indio_dev);
	if (err)
		goto st_press_device_register_error;

	dev_info(&indio_dev->dev, "registered pressure sensor %s\n",
		 indio_dev->name);

	return err;

st_press_device_register_error:
	if (irq > 0)
		st_sensors_deallocate_trigger(indio_dev);
st_press_probe_trigger_error:
	st_press_deallocate_ring(indio_dev);
st_press_power_off:
	st_sensors_power_disable(indio_dev);

	return err;
}
EXPORT_SYMBOL(st_press_common_probe);

void st_press_common_remove(struct iio_dev *indio_dev)
{
	struct st_sensor_data *press_data = iio_priv(indio_dev);

	st_sensors_power_disable(indio_dev);

	iio_device_unregister(indio_dev);
	if (press_data->get_irq_data_ready(indio_dev) > 0)
		st_sensors_deallocate_trigger(indio_dev);

	st_press_deallocate_ring(indio_dev);
}
EXPORT_SYMBOL(st_press_common_remove);

MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
MODULE_DESCRIPTION("STMicroelectronics pressures driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
217494e5 DC	1	/*
	2	* STMicroelectronics pressures driver
	3	*
	4	* Copyright 2013 STMicroelectronics Inc.
	5	*
	6	* Denis Ciocca <denis.ciocca@st.com>
	7	*
	8	* Licensed under the GPL-2.
	9	*/
	10
	11	#include <linux/kernel.h>
	12	#include <linux/module.h>
	13	#include <linux/slab.h>
	14	#include <linux/errno.h>
	15	#include <linux/types.h>
	16	#include <linux/mutex.h>
	17	#include <linux/interrupt.h>
	18	#include <linux/i2c.h>
	19	#include <linux/gpio.h>
	20	#include <linux/irq.h>
	21	#include <linux/delay.h>
	22	#include <linux/iio/iio.h>
	23	#include <linux/iio/sysfs.h>
	24	#include <linux/iio/trigger.h>
	25	#include <linux/iio/buffer.h>
	26	#include <asm/unaligned.h>
	27
	28	#include <linux/iio/common/st_sensors.h>
	29	#include "st_pressure.h"
	30
19b7b8a8 GB	31	/*
	32	* About determining pressure scaling factors
	33	* ------------------------------------------
	34	*
	35	* Datasheets specify typical pressure sensitivity so that pressure is computed
	36	* according to the following equation :
	37	* pressure[mBar] = raw / sensitivity
	38	* where :
	39	* raw the 24 bits long raw sampled pressure
	40	* sensitivity a scaling factor specified by the datasheet in LSB/mBar
	41	*
	42	* IIO ABI expects pressure to be expressed as kPascal, hence pressure should be
	43	* computed according to :
	44	* pressure[kPascal] = pressure[mBar] / 10
	45	* = raw / (sensitivity * 10) (1)
	46	*
	47	* Finally, st_press_read_raw() returns pressure scaling factor as an
	48	* IIO_VAL_INT_PLUS_NANO with a zero integral part and "gain" as decimal part.
	49	* Therefore, from (1), "gain" becomes :
	50	* gain = 10^9 / (sensitivity * 10)
	51	* = 10^8 / sensitivity
	52	*
	53	* About determining temperature scaling factors and offsets
	54	* ---------------------------------------------------------
	55	*
	56	* Datasheets specify typical temperature sensitivity and offset so that
	57	* temperature is computed according to the following equation :
	58	* temp[Celsius] = offset[Celsius] + (raw / sensitivity)
	59	* where :
	60	* raw the 16 bits long raw sampled temperature
	61	* offset a constant specified by the datasheet in degree Celsius
	62	* (sometimes zero)
	63	* sensitivity a scaling factor specified by the datasheet in LSB/Celsius
	64	*
	65	* IIO ABI expects temperature to be expressed as milli degree Celsius such as
	66	* user space should compute temperature according to :
	67	* temp[mCelsius] = temp[Celsius] * 10^3
	68	* = (offset[Celsius] + (raw / sensitivity)) * 10^3
	69	* = ((offset[Celsius] * sensitivity) + raw) *
	70	* (10^3 / sensitivity) (2)
	71	*
	72	* IIO ABI expects user space to apply offset and scaling factors to raw samples
	73	* according to :
	74	* temp[mCelsius] = (OFFSET + raw) * SCALE
	75	* where :
	76	* OFFSET an arbitrary constant exposed by device
	77	* SCALE an arbitrary scaling factor exposed by device
	78	*
	79	* Matching OFFSET and SCALE with members of (2) gives :
	80	* OFFSET = offset[Celsius] * sensitivity (3)
	81	* SCALE = 10^3 / sensitivity (4)
	82	*
	83	* st_press_read_raw() returns temperature scaling factor as an
	84	* IIO_VAL_FRACTIONAL with a 10^3 numerator and "gain2" as denominator.
	85	* Therefore, from (3), "gain2" becomes :
	86	* gain2 = sensitivity
	87	*
	88	* When declared within channel, i.e. for a non zero specified offset,
	89	* st_press_read_raw() will return the latter as an IIO_VAL_FRACTIONAL such as :
	90	* numerator = OFFSET * 10^3
	91	* denominator = 10^3
	92	* giving from (4):
	93	* numerator = offset[Celsius] * 10^3 * sensitivity
	94	* = offset[mCelsius] * gain2
95	*/
96
d43a4115 GB	97	#define MCELSIUS_PER_CELSIUS 1000
	98
	99	/* Default pressure sensitivity */
67dbf54a JA	100	#define ST_PRESS_LSB_PER_MBAR 4096UL
	101	#define ST_PRESS_KPASCAL_NANO_SCALE (100000000UL / \
	102	ST_PRESS_LSB_PER_MBAR)
d43a4115 GB	103
d43a4115 GB	104	/* Default temperature sensitivity */
1003eb67	105	#define ST_PRESS_LSB_PER_CELSIUS 480UL
d43a4115 GB	106	#define ST_PRESS_MILLI_CELSIUS_OFFSET 42500UL
d43a4115 GB	107
217494e5	108	/* FULLSCALE */
d43a4115	109	#define ST_PRESS_FS_AVL_1100MB 1100
217494e5 DC	110	#define ST_PRESS_FS_AVL_1260MB 1260
217494e5 DC	111
93187840 DC	112	#define ST_PRESS_1_OUT_XL_ADDR 0x28
	113	#define ST_TEMP_1_OUT_L_ADDR 0x2b
	114
d43a4115 GB	115	/* LPS001WP pressure resolution */
	116	#define ST_PRESS_LPS001WP_LSB_PER_MBAR 16UL
	117	/* LPS001WP temperature resolution */
	118	#define ST_PRESS_LPS001WP_LSB_PER_CELSIUS 64UL
91a86a3b	119	/* LPS001WP pressure gain */
d43a4115 GB	120	#define ST_PRESS_LPS001WP_FS_AVL_PRESS_GAIN \
d43a4115 GB	121	(100000000UL / ST_PRESS_LPS001WP_LSB_PER_MBAR)
91a86a3b	122	/* LPS001WP pressure and temp L addresses */
7885a8ce LJ	123	#define ST_PRESS_LPS001WP_OUT_L_ADDR 0x28
	124	#define ST_TEMP_LPS001WP_OUT_L_ADDR 0x2a
	125
91a86a3b	126	/* LPS25H pressure and temp L addresses */
93187840 DC	127	#define ST_PRESS_LPS25H_OUT_XL_ADDR 0x28
	128	#define ST_TEMP_LPS25H_OUT_L_ADDR 0x2b
	129
85d79136 GB	130	/* LPS22HB temperature sensitivity */
	131	#define ST_PRESS_LPS22HB_LSB_PER_CELSIUS 100UL
	132
93187840	133	static const struct iio_chan_spec st_press_1_channels[] = {
2f5effcb LJ	134	{
2f5effcb LJ	135	.type = IIO_PRESSURE,
93187840	136	.address = ST_PRESS_1_OUT_XL_ADDR,
b4701fd6	137	.scan_index = 0,
2f5effcb	138	.scan_type = {
1b211d48	139	.sign = 's',
2f5effcb	140	.realbits = 24,
c9d5e5b9	141	.storagebits = 32,
2f5effcb LJ	142	.endianness = IIO_LE,
	143	},
	144	.info_mask_separate =
217494e5	145	BIT(IIO_CHAN_INFO_RAW) \| BIT(IIO_CHAN_INFO_SCALE),
7f0d8740	146	.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
2f5effcb LJ	147	},
	148	{
	149	.type = IIO_TEMP,
93187840	150	.address = ST_TEMP_1_OUT_L_ADDR,
b4701fd6	151	.scan_index = 1,
2f5effcb	152	.scan_type = {
1b211d48	153	.sign = 's',
2f5effcb LJ	154	.realbits = 16,
	155	.storagebits = 16,
	156	.endianness = IIO_LE,
	157	},
	158	.info_mask_separate =
	159	BIT(IIO_CHAN_INFO_RAW) \|
	160	BIT(IIO_CHAN_INFO_SCALE) \|
	161	BIT(IIO_CHAN_INFO_OFFSET),
7f0d8740	162	.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
2f5effcb	163	},
b4701fd6	164	IIO_CHAN_SOFT_TIMESTAMP(2)
217494e5 DC	165	};
217494e5 DC	166
7885a8ce LJ	167	static const struct iio_chan_spec st_press_lps001wp_channels[] = {
	168	{
	169	.type = IIO_PRESSURE,
7885a8ce	170	.address = ST_PRESS_LPS001WP_OUT_L_ADDR,
b4701fd6	171	.scan_index = 0,
7885a8ce	172	.scan_type = {
1b211d48	173	.sign = 's',
7885a8ce LJ	174	.realbits = 16,
	175	.storagebits = 16,
	176	.endianness = IIO_LE,
	177	},
d43a4115 GB	178	.info_mask_separate =
	179	BIT(IIO_CHAN_INFO_RAW) \|
	180	BIT(IIO_CHAN_INFO_SCALE),
7885a8ce LJ	181	},
	182	{
	183	.type = IIO_TEMP,
7885a8ce	184	.address = ST_TEMP_LPS001WP_OUT_L_ADDR,
b4701fd6	185	.scan_index = 1,
7885a8ce	186	.scan_type = {
1b211d48	187	.sign = 's',
7885a8ce LJ	188	.realbits = 16,
	189	.storagebits = 16,
	190	.endianness = IIO_LE,
	191	},
	192	.info_mask_separate =
	193	BIT(IIO_CHAN_INFO_RAW) \|
d43a4115	194	BIT(IIO_CHAN_INFO_SCALE),
7885a8ce	195	},
b4701fd6	196	IIO_CHAN_SOFT_TIMESTAMP(2)
7885a8ce LJ	197	};
7885a8ce LJ	198
e039e2f5 GB	199	static const struct iio_chan_spec st_press_lps22hb_channels[] = {
	200	{
	201	.type = IIO_PRESSURE,
e039e2f5 GB	202	.address = ST_PRESS_1_OUT_XL_ADDR,
	203	.scan_index = 0,
	204	.scan_type = {
1b211d48	205	.sign = 's',
e039e2f5	206	.realbits = 24,
c9d5e5b9	207	.storagebits = 32,
e039e2f5 GB	208	.endianness = IIO_LE,
	209	},
	210	.info_mask_separate =
	211	BIT(IIO_CHAN_INFO_RAW) \|
	212	BIT(IIO_CHAN_INFO_SCALE),
	213	.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
e039e2f5	214	},
85d79136 GB	215	{
	216	.type = IIO_TEMP,
	217	.address = ST_TEMP_1_OUT_L_ADDR,
	218	.scan_index = 1,
	219	.scan_type = {
	220	.sign = 's',
	221	.realbits = 16,
	222	.storagebits = 16,
	223	.endianness = IIO_LE,
	224	},
	225	.info_mask_separate =
	226	BIT(IIO_CHAN_INFO_RAW) \|
	227	BIT(IIO_CHAN_INFO_SCALE),
	228	.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
	229	},
	230	IIO_CHAN_SOFT_TIMESTAMP(2)
e039e2f5 GB	231	};
e039e2f5 GB	232
a7ee8839	233	static const struct st_sensor_settings st_press_sensors_settings[] = {
217494e5	234	{
91a86a3b LW	235	/*
	236	* CUSTOM VALUES FOR LPS331AP SENSOR
	237	* See LPS331AP datasheet:
	238	* http://www2.st.com/resource/en/datasheet/lps331ap.pdf
	239	*/
	240	.wai = 0xbb,
bc27381e	241	.wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
217494e5 DC	242	.sensors_supported = {
	243	[0] = LPS331AP_PRESS_DEV_NAME,
	244	},
93187840 DC	245	.ch = (struct iio_chan_spec *)st_press_1_channels,
93187840 DC	246	.num_ch = ARRAY_SIZE(st_press_1_channels),
217494e5	247	.odr = {
91a86a3b LW	248	.addr = 0x20,
91a86a3b LW	249	.mask = 0x70,
217494e5	250	.odr_avl = {
91a86a3b LW	251	{ .hz = 1, .value = 0x01 },
	252	{ .hz = 7, .value = 0x05 },
	253	{ .hz = 13, .value = 0x06 },
	254	{ .hz = 25, .value = 0x07 },
217494e5 DC	255	},
	256	},
	257	.pw = {
91a86a3b LW	258	.addr = 0x20,
91a86a3b LW	259	.mask = 0x80,
217494e5 DC	260	.value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
	261	.value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
	262	},
	263	.fs = {
91a86a3b LW	264	.addr = 0x23,
91a86a3b LW	265	.mask = 0x30,
217494e5	266	.fs_avl = {
d43a4115 GB	267	/*
	268	* Pressure and temperature sensitivity values
	269	* as defined in table 3 of LPS331AP datasheet.
	270	*/
217494e5 DC	271	[0] = {
217494e5 DC	272	.num = ST_PRESS_FS_AVL_1260MB,
d43a4115 GB	273	.gain = ST_PRESS_KPASCAL_NANO_SCALE,
d43a4115 GB	274	.gain2 = ST_PRESS_LSB_PER_CELSIUS,
217494e5 DC	275	},
	276	},
	277	},
	278	.bdu = {
91a86a3b LW	279	.addr = 0x20,
91a86a3b LW	280	.mask = 0x04,
217494e5 DC	281	},
217494e5 DC	282	.drdy_irq = {
91a86a3b LW	283	.addr = 0x22,
	284	.mask_int1 = 0x04,
	285	.mask_int2 = 0x20,
	286	.addr_ihl = 0x22,
	287	.mask_ihl = 0x80,
	288	.addr_od = 0x22,
	289	.mask_od = 0x40,
97865fe4	290	.addr_stat_drdy = ST_SENSORS_DEFAULT_STAT_ADDR,
217494e5	291	},
91a86a3b	292	.multi_read_bit = true,
217494e5 DC	293	.bootime = 2,
217494e5 DC	294	},
7885a8ce	295	{
91a86a3b LW	296	/*
	297	* CUSTOM VALUES FOR LPS001WP SENSOR
	298	*/
	299	.wai = 0xba,
bc27381e	300	.wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
7885a8ce LJ	301	.sensors_supported = {
	302	[0] = LPS001WP_PRESS_DEV_NAME,
	303	},
	304	.ch = (struct iio_chan_spec *)st_press_lps001wp_channels,
	305	.num_ch = ARRAY_SIZE(st_press_lps001wp_channels),
	306	.odr = {
91a86a3b LW	307	.addr = 0x20,
91a86a3b LW	308	.mask = 0x30,
7885a8ce	309	.odr_avl = {
91a86a3b LW	310	{ .hz = 1, .value = 0x01 },
	311	{ .hz = 7, .value = 0x02 },
	312	{ .hz = 13, .value = 0x03 },
7885a8ce LJ	313	},
	314	},
	315	.pw = {
91a86a3b LW	316	.addr = 0x20,
91a86a3b LW	317	.mask = 0x40,
7885a8ce LJ	318	.value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
	319	.value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
	320	},
	321	.fs = {
d43a4115 GB	322	.fs_avl = {
	323	/*
	324	* Pressure and temperature resolution values
	325	* as defined in table 3 of LPS001WP datasheet.
	326	*/
	327	[0] = {
	328	.num = ST_PRESS_FS_AVL_1100MB,
	329	.gain = ST_PRESS_LPS001WP_FS_AVL_PRESS_GAIN,
	330	.gain2 = ST_PRESS_LPS001WP_LSB_PER_CELSIUS,
	331	},
	332	},
7885a8ce LJ	333	},
7885a8ce LJ	334	.bdu = {
91a86a3b LW	335	.addr = 0x20,
91a86a3b LW	336	.mask = 0x04,
7885a8ce LJ	337	},
	338	.drdy_irq = {
	339	.addr = 0,
	340	},
91a86a3b	341	.multi_read_bit = true,
7885a8ce LJ	342	.bootime = 2,
7885a8ce LJ	343	},
93187840	344	{
91a86a3b LW	345	/*
	346	* CUSTOM VALUES FOR LPS25H SENSOR
	347	* See LPS25H datasheet:
	348	* http://www2.st.com/resource/en/datasheet/lps25h.pdf
	349	*/
	350	.wai = 0xbd,
bc27381e	351	.wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
93187840 DC	352	.sensors_supported = {
	353	[0] = LPS25H_PRESS_DEV_NAME,
	354	},
	355	.ch = (struct iio_chan_spec *)st_press_1_channels,
	356	.num_ch = ARRAY_SIZE(st_press_1_channels),
	357	.odr = {
91a86a3b LW	358	.addr = 0x20,
91a86a3b LW	359	.mask = 0x70,
93187840	360	.odr_avl = {
91a86a3b LW	361	{ .hz = 1, .value = 0x01 },
	362	{ .hz = 7, .value = 0x02 },
	363	{ .hz = 13, .value = 0x03 },
	364	{ .hz = 25, .value = 0x04 },
93187840 DC	365	},
	366	},
	367	.pw = {
91a86a3b LW	368	.addr = 0x20,
91a86a3b LW	369	.mask = 0x80,
93187840 DC	370	.value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
	371	.value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
	372	},
	373	.fs = {
93187840	374	.fs_avl = {
d43a4115 GB	375	/*
	376	* Pressure and temperature sensitivity values
	377	* as defined in table 3 of LPS25H datasheet.
	378	*/
93187840 DC	379	[0] = {
93187840 DC	380	.num = ST_PRESS_FS_AVL_1260MB,
d43a4115 GB	381	.gain = ST_PRESS_KPASCAL_NANO_SCALE,
d43a4115 GB	382	.gain2 = ST_PRESS_LSB_PER_CELSIUS,
93187840 DC	383	},
	384	},
	385	},
	386	.bdu = {
91a86a3b LW	387	.addr = 0x20,
91a86a3b LW	388	.mask = 0x04,
93187840 DC	389	},
93187840 DC	390	.drdy_irq = {
91a86a3b LW	391	.addr = 0x23,
	392	.mask_int1 = 0x01,
	393	.mask_int2 = 0x10,
	394	.addr_ihl = 0x22,
	395	.mask_ihl = 0x80,
	396	.addr_od = 0x22,
	397	.mask_od = 0x40,
97865fe4	398	.addr_stat_drdy = ST_SENSORS_DEFAULT_STAT_ADDR,
93187840	399	},
91a86a3b	400	.multi_read_bit = true,
93187840 DC	401	.bootime = 2,
93187840 DC	402	},
e039e2f5	403	{
91a86a3b LW	404	/*
	405	* CUSTOM VALUES FOR LPS22HB SENSOR
	406	* See LPS22HB datasheet:
	407	* http://www2.st.com/resource/en/datasheet/lps22hb.pdf
	408	*/
	409	.wai = 0xb1,
e039e2f5 GB	410	.wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
	411	.sensors_supported = {
	412	[0] = LPS22HB_PRESS_DEV_NAME,
	413	},
	414	.ch = (struct iio_chan_spec *)st_press_lps22hb_channels,
	415	.num_ch = ARRAY_SIZE(st_press_lps22hb_channels),
	416	.odr = {
91a86a3b LW	417	.addr = 0x10,
91a86a3b LW	418	.mask = 0x70,
e039e2f5	419	.odr_avl = {
91a86a3b LW	420	{ .hz = 1, .value = 0x01 },
	421	{ .hz = 10, .value = 0x02 },
	422	{ .hz = 25, .value = 0x03 },
	423	{ .hz = 50, .value = 0x04 },
	424	{ .hz = 75, .value = 0x05 },
e039e2f5 GB	425	},
	426	},
	427	.pw = {
91a86a3b LW	428	.addr = 0x10,
91a86a3b LW	429	.mask = 0x70,
e039e2f5 GB	430	.value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
	431	},
	432	.fs = {
	433	.fs_avl = {
19b7b8a8	434	/*
85d79136 GB	435	* Pressure and temperature sensitivity values
85d79136 GB	436	* as defined in table 3 of LPS22HB datasheet.
19b7b8a8	437	*/
e039e2f5 GB	438	[0] = {
	439	.num = ST_PRESS_FS_AVL_1260MB,
	440	.gain = ST_PRESS_KPASCAL_NANO_SCALE,
85d79136	441	.gain2 = ST_PRESS_LPS22HB_LSB_PER_CELSIUS,
e039e2f5 GB	442	},
	443	},
	444	},
	445	.bdu = {
91a86a3b LW	446	.addr = 0x10,
91a86a3b LW	447	.mask = 0x02,
e039e2f5 GB	448	},
e039e2f5 GB	449	.drdy_irq = {
91a86a3b LW	450	.addr = 0x12,
	451	.mask_int1 = 0x04,
	452	.mask_int2 = 0x08,
	453	.addr_ihl = 0x12,
	454	.mask_ihl = 0x80,
	455	.addr_od = 0x12,
	456	.mask_od = 0x40,
05167cdc	457	.addr_stat_drdy = ST_SENSORS_DEFAULT_STAT_ADDR,
e039e2f5	458	},
add6e6ab	459	.multi_read_bit = false,
51f528a1	460	.bootime = 2,
e039e2f5	461	},
217494e5 DC	462	};
217494e5 DC	463
2d239c9e JC	464	static int st_press_write_raw(struct iio_dev *indio_dev,
	465	struct iio_chan_spec const *ch,
	466	int val,
	467	int val2,
	468	long mask)
	469	{
	470	int err;
	471
	472	switch (mask) {
	473	case IIO_CHAN_INFO_SAMP_FREQ:
	474	if (val2)
	475	return -EINVAL;
	476	mutex_lock(&indio_dev->mlock);
	477	err = st_sensors_set_odr(indio_dev, val);
	478	mutex_unlock(&indio_dev->mlock);
	479	return err;
	480	default:
	481	return -EINVAL;
	482	}
	483	}
	484
217494e5 DC	485	static int st_press_read_raw(struct iio_dev *indio_dev,
	486	struct iio_chan_spec const ch, int val,
	487	int *val2, long mask)
	488	{
	489	int err;
a1dcf429	490	struct st_sensor_data *press_data = iio_priv(indio_dev);
217494e5 DC	491
	492	switch (mask) {
	493	case IIO_CHAN_INFO_RAW:
	494	err = st_sensors_read_info_raw(indio_dev, ch, val);
	495	if (err < 0)
	496	goto read_error;
	497
	498	return IIO_VAL_INT;
	499	case IIO_CHAN_INFO_SCALE:
217494e5 DC	500	switch (ch->type) {
217494e5 DC	501	case IIO_PRESSURE:
d43a4115	502	*val = 0;
a1dcf429	503	*val2 = press_data->current_fullscale->gain;
d43a4115	504	return IIO_VAL_INT_PLUS_NANO;
217494e5	505	case IIO_TEMP:
d43a4115	506	*val = MCELSIUS_PER_CELSIUS;
a1dcf429	507	*val2 = press_data->current_fullscale->gain2;
d43a4115	508	return IIO_VAL_FRACTIONAL;
217494e5 DC	509	default:
	510	err = -EINVAL;
	511	goto read_error;
	512	}
	513
217494e5 DC	514	case IIO_CHAN_INFO_OFFSET:
	515	switch (ch->type) {
	516	case IIO_TEMP:
d43a4115 GB	517	val = ST_PRESS_MILLI_CELSIUS_OFFSET
	518	press_data->current_fullscale->gain2;
	519	*val2 = MCELSIUS_PER_CELSIUS;
217494e5 DC	520	break;
	521	default:
	522	err = -EINVAL;
	523	goto read_error;
	524	}
	525
	526	return IIO_VAL_FRACTIONAL;
2d239c9e	527	case IIO_CHAN_INFO_SAMP_FREQ:
a1dcf429	528	*val = press_data->odr;
2d239c9e	529	return IIO_VAL_INT;
217494e5 DC	530	default:
	531	return -EINVAL;
	532	}
	533
	534	read_error:
	535	return err;
	536	}
	537
217494e5 DC	538	static ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL();
	539
	540	static struct attribute *st_press_attributes[] = {
	541	&iio_dev_attr_sampling_frequency_available.dev_attr.attr,
217494e5 DC	542	NULL,
	543	};
	544
	545	static const struct attribute_group st_press_attribute_group = {
	546	.attrs = st_press_attributes,
	547	};
	548
	549	static const struct iio_info press_info = {
	550	.driver_module = THIS_MODULE,
	551	.attrs = &st_press_attribute_group,
	552	.read_raw = &st_press_read_raw,
2d239c9e	553	.write_raw = &st_press_write_raw,
a0175b9c	554	.debugfs_reg_access = &st_sensors_debugfs_reg_access,
217494e5 DC	555	};
	556
	557	#ifdef CONFIG_IIO_TRIGGER
	558	static const struct iio_trigger_ops st_press_trigger_ops = {
	559	.owner = THIS_MODULE,
	560	.set_trigger_state = ST_PRESS_TRIGGER_SET_STATE,
65925b65	561	.validate_device = st_sensors_validate_device,
217494e5 DC	562	};
	563	#define ST_PRESS_TRIGGER_OPS (&st_press_trigger_ops)
	564	#else
	565	#define ST_PRESS_TRIGGER_OPS NULL
	566	#endif
	567
0baa3fc1	568	int st_press_common_probe(struct iio_dev *indio_dev)
217494e5	569	{
a1dcf429	570	struct st_sensor_data *press_data = iio_priv(indio_dev);
7383d44b SB	571	struct st_sensors_platform_data *pdata =
7383d44b SB	572	(struct st_sensors_platform_data *)press_data->dev->platform_data;
a1dcf429	573	int irq = press_data->get_irq_data_ready(indio_dev);
a6cc5b25	574	int err;
217494e5 DC	575
	576	indio_dev->modes = INDIO_DIRECT_MODE;
	577	indio_dev->info = &press_info;
8e71c04f	578	mutex_init(&press_data->tb.buf_lock);
217494e5	579
14f295c8 GB	580	err = st_sensors_power_enable(indio_dev);
	581	if (err)
	582	return err;
77448761	583
217494e5	584	err = st_sensors_check_device_support(indio_dev,
a7ee8839 DC	585	ARRAY_SIZE(st_press_sensors_settings),
a7ee8839 DC	586	st_press_sensors_settings);
217494e5	587	if (err < 0)
14f295c8	588	goto st_press_power_off;
217494e5	589
b4701fd6 GB	590	/*
	591	* Skip timestamping channel while declaring available channels to
	592	* common st_sensor layer. Look at st_sensors_get_buffer_element() to
	593	* see how timestamps are explicitly pushed as last samples block
	594	* element.
	595	*/
	596	press_data->num_data_channels = press_data->sensor_settings->num_ch - 1;
a1dcf429 DC	597	press_data->multiread_bit = press_data->sensor_settings->multi_read_bit;
	598	indio_dev->channels = press_data->sensor_settings->ch;
	599	indio_dev->num_channels = press_data->sensor_settings->num_ch;
217494e5	600
e039e2f5 GB	601	press_data->current_fullscale =
	602	(struct st_sensor_fullscale_avl *)
	603	&press_data->sensor_settings->fs.fs_avl[0];
362f2f86	604
a1dcf429	605	press_data->odr = press_data->sensor_settings->odr.odr_avl[0].hz;
217494e5	606
38d1c6a9	607	/* Some devices don't support a data ready pin. */
7383d44b SB	608	if (!pdata && press_data->sensor_settings->drdy_irq.addr)
7383d44b SB	609	pdata = (struct st_sensors_platform_data *)&default_press_pdata;
23cde4d6	610
a1dcf429	611	err = st_sensors_init_sensor(indio_dev, press_data->dev->platform_data);
217494e5	612	if (err < 0)
14f295c8	613	goto st_press_power_off;
217494e5	614
7a137c9c DC	615	err = st_press_allocate_ring(indio_dev);
7a137c9c DC	616	if (err < 0)
14f295c8	617	goto st_press_power_off;
217494e5	618
7a137c9c	619	if (irq > 0) {
217494e5	620	err = st_sensors_allocate_trigger(indio_dev,
a6cc5b25	621	ST_PRESS_TRIGGER_OPS);
217494e5 DC	622	if (err < 0)
	623	goto st_press_probe_trigger_error;
	624	}
	625
	626	err = iio_device_register(indio_dev);
	627	if (err)
	628	goto st_press_device_register_error;
	629
4f544ced LW	630	dev_info(&indio_dev->dev, "registered pressure sensor %s\n",
	631	indio_dev->name);
	632
217494e5 DC	633	return err;
	634
	635	st_press_device_register_error:
a6cc5b25	636	if (irq > 0)
217494e5 DC	637	st_sensors_deallocate_trigger(indio_dev);
217494e5 DC	638	st_press_probe_trigger_error:
7a137c9c	639	st_press_deallocate_ring(indio_dev);
14f295c8 GB	640	st_press_power_off:
14f295c8 GB	641	st_sensors_power_disable(indio_dev);
a6cc5b25	642
217494e5 DC	643	return err;
	644	}
	645	EXPORT_SYMBOL(st_press_common_probe);
	646
	647	void st_press_common_remove(struct iio_dev *indio_dev)
	648	{
a1dcf429	649	struct st_sensor_data *press_data = iio_priv(indio_dev);
217494e5	650
ea7e586b	651	st_sensors_power_disable(indio_dev);
77448761	652
217494e5	653	iio_device_unregister(indio_dev);
a1dcf429	654	if (press_data->get_irq_data_ready(indio_dev) > 0)
217494e5	655	st_sensors_deallocate_trigger(indio_dev);
7a137c9c DC	656
7a137c9c DC	657	st_press_deallocate_ring(indio_dev);
217494e5 DC	658	}
	659	EXPORT_SYMBOL(st_press_common_remove);
	660
	661	MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
	662	MODULE_DESCRIPTION("STMicroelectronics pressures driver");
	663	MODULE_LICENSE("GPL v2");