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/*
* 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"
#define ST_PRESS_MBAR_TO_KPASCAL(x) (x * 10)
#define ST_PRESS_NUMBER_DATA_CHANNELS 1
/* DEFAULT VALUE FOR SENSORS */
#define ST_PRESS_DEFAULT_OUT_XL_ADDR 0x28
#define ST_TEMP_DEFAULT_OUT_L_ADDR 0x2b
/* FULLSCALE */
#define ST_PRESS_FS_AVL_1260MB 1260
/* CUSTOM VALUES FOR SENSOR 1 */
#define ST_PRESS_1_WAI_EXP 0xbb
#define ST_PRESS_1_ODR_ADDR 0x20
#define ST_PRESS_1_ODR_MASK 0x70
#define ST_PRESS_1_ODR_AVL_1HZ_VAL 0x01
#define ST_PRESS_1_ODR_AVL_7HZ_VAL 0x05
#define ST_PRESS_1_ODR_AVL_13HZ_VAL 0x06
#define ST_PRESS_1_ODR_AVL_25HZ_VAL 0x07
#define ST_PRESS_1_PW_ADDR 0x20
#define ST_PRESS_1_PW_MASK 0x80
#define ST_PRESS_1_FS_ADDR 0x23
#define ST_PRESS_1_FS_MASK 0x30
#define ST_PRESS_1_FS_AVL_1260_VAL 0x00
#define ST_PRESS_1_FS_AVL_1260_GAIN ST_PRESS_MBAR_TO_KPASCAL(244141)
#define ST_PRESS_1_FS_AVL_TEMP_GAIN 2083000
#define ST_PRESS_1_BDU_ADDR 0x20
#define ST_PRESS_1_BDU_MASK 0x04
#define ST_PRESS_1_DRDY_IRQ_ADDR 0x22
#define ST_PRESS_1_DRDY_IRQ_MASK 0x04
#define ST_PRESS_1_MULTIREAD_BIT true
#define ST_PRESS_1_TEMP_OFFSET 42500
static const struct iio_chan_spec st_press_channels[] = {
ST_SENSORS_LSM_CHANNELS(IIO_PRESSURE,
BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
ST_SENSORS_SCAN_X, 0, IIO_NO_MOD, 'u', IIO_LE, 24, 24,
ST_PRESS_DEFAULT_OUT_XL_ADDR),
ST_SENSORS_LSM_CHANNELS(IIO_TEMP,
BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE) |
BIT(IIO_CHAN_INFO_OFFSET),
-1, 0, IIO_NO_MOD, 's', IIO_LE, 16, 16,
ST_TEMP_DEFAULT_OUT_L_ADDR),
IIO_CHAN_SOFT_TIMESTAMP(1)
};
static const struct st_sensors st_press_sensors[] = {
{
.wai = ST_PRESS_1_WAI_EXP,
.sensors_supported = {
[0] = LPS331AP_PRESS_DEV_NAME,
},
.ch = (struct iio_chan_spec *)st_press_channels,
.odr = {
.addr = ST_PRESS_1_ODR_ADDR,
.mask = ST_PRESS_1_ODR_MASK,
.odr_avl = {
{ 1, ST_PRESS_1_ODR_AVL_1HZ_VAL, },
{ 7, ST_PRESS_1_ODR_AVL_7HZ_VAL, },
{ 13, ST_PRESS_1_ODR_AVL_13HZ_VAL, },
{ 25, ST_PRESS_1_ODR_AVL_25HZ_VAL, },
},
},
.pw = {
.addr = ST_PRESS_1_PW_ADDR,
.mask = ST_PRESS_1_PW_MASK,
.value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
.value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
},
.fs = {
.addr = ST_PRESS_1_FS_ADDR,
.mask = ST_PRESS_1_FS_MASK,
.fs_avl = {
[0] = {
.num = ST_PRESS_FS_AVL_1260MB,
.value = ST_PRESS_1_FS_AVL_1260_VAL,
.gain = ST_PRESS_1_FS_AVL_1260_GAIN,
.gain2 = ST_PRESS_1_FS_AVL_TEMP_GAIN,
},
},
},
.bdu = {
.addr = ST_PRESS_1_BDU_ADDR,
.mask = ST_PRESS_1_BDU_MASK,
},
.drdy_irq = {
.addr = ST_PRESS_1_DRDY_IRQ_ADDR,
.mask = ST_PRESS_1_DRDY_IRQ_MASK,
},
.multi_read_bit = ST_PRESS_1_MULTIREAD_BIT,
.bootime = 2,
},
};
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 *pdata = 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:
*val = 0;
switch (ch->type) {
case IIO_PRESSURE:
*val2 = pdata->current_fullscale->gain;
break;
case IIO_TEMP:
*val2 = pdata->current_fullscale->gain2;
break;
default:
err = -EINVAL;
goto read_error;
}
return IIO_VAL_INT_PLUS_NANO;
case IIO_CHAN_INFO_OFFSET:
switch (ch->type) {
case IIO_TEMP:
*val = 425;
*val2 = 10;
break;
default:
err = -EINVAL;
goto read_error;
}
return IIO_VAL_FRACTIONAL;
default:
return -EINVAL;
}
read_error:
return err;
}
static ST_SENSOR_DEV_ATTR_SAMP_FREQ();
static ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL();
static struct attribute *st_press_attributes[] = {
&iio_dev_attr_sampling_frequency_available.dev_attr.attr,
&iio_dev_attr_sampling_frequency.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,
};
#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,
};
#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)
{
int err;
struct st_sensor_data *pdata = iio_priv(indio_dev);
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->info = &press_info;
err = st_sensors_check_device_support(indio_dev,
ARRAY_SIZE(st_press_sensors), st_press_sensors);
if (err < 0)
goto st_press_common_probe_error;
pdata->num_data_channels = ST_PRESS_NUMBER_DATA_CHANNELS;
pdata->multiread_bit = pdata->sensor->multi_read_bit;
indio_dev->channels = pdata->sensor->ch;
indio_dev->num_channels = ARRAY_SIZE(st_press_channels);
pdata->current_fullscale = (struct st_sensor_fullscale_avl *)
&pdata->sensor->fs.fs_avl[0];
pdata->odr = pdata->sensor->odr.odr_avl[0].hz;
err = st_sensors_init_sensor(indio_dev);
if (err < 0)
goto st_press_common_probe_error;
if (pdata->get_irq_data_ready(indio_dev) > 0) {
err = st_press_allocate_ring(indio_dev);
if (err < 0)
goto st_press_common_probe_error;
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;
return err;
st_press_device_register_error:
if (pdata->get_irq_data_ready(indio_dev) > 0)
st_sensors_deallocate_trigger(indio_dev);
st_press_probe_trigger_error:
if (pdata->get_irq_data_ready(indio_dev) > 0)
st_press_deallocate_ring(indio_dev);
st_press_common_probe_error:
return err;
}
EXPORT_SYMBOL(st_press_common_probe);
void st_press_common_remove(struct iio_dev *indio_dev)
{
struct st_sensor_data *pdata = iio_priv(indio_dev);
iio_device_unregister(indio_dev);
if (pdata->get_irq_data_ready(indio_dev) > 0) {
st_sensors_deallocate_trigger(indio_dev);
st_press_deallocate_ring(indio_dev);
}
iio_device_free(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");
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