- 根目录:
- 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"
#define ST_PRESS_LSB_PER_MBAR 4096UL
#define ST_PRESS_KPASCAL_NANO_SCALE (100000000UL / \
ST_PRESS_LSB_PER_MBAR)
#define ST_PRESS_LSB_PER_CELSIUS 480UL
#define ST_PRESS_CELSIUS_NANO_SCALE (1000000000UL / \
ST_PRESS_LSB_PER_CELSIUS)
#define ST_PRESS_NUMBER_DATA_CHANNELS 1
/* FULLSCALE */
#define ST_PRESS_FS_AVL_1260MB 1260
#define ST_PRESS_1_OUT_XL_ADDR 0x28
#define ST_TEMP_1_OUT_L_ADDR 0x2b
/* CUSTOM VALUES FOR LPS331AP SENSOR */
#define ST_PRESS_LPS331AP_WAI_EXP 0xbb
#define ST_PRESS_LPS331AP_ODR_ADDR 0x20
#define ST_PRESS_LPS331AP_ODR_MASK 0x70
#define ST_PRESS_LPS331AP_ODR_AVL_1HZ_VAL 0x01
#define ST_PRESS_LPS331AP_ODR_AVL_7HZ_VAL 0x05
#define ST_PRESS_LPS331AP_ODR_AVL_13HZ_VAL 0x06
#define ST_PRESS_LPS331AP_ODR_AVL_25HZ_VAL 0x07
#define ST_PRESS_LPS331AP_PW_ADDR 0x20
#define ST_PRESS_LPS331AP_PW_MASK 0x80
#define ST_PRESS_LPS331AP_FS_ADDR 0x23
#define ST_PRESS_LPS331AP_FS_MASK 0x30
#define ST_PRESS_LPS331AP_FS_AVL_1260_VAL 0x00
#define ST_PRESS_LPS331AP_FS_AVL_1260_GAIN ST_PRESS_KPASCAL_NANO_SCALE
#define ST_PRESS_LPS331AP_FS_AVL_TEMP_GAIN ST_PRESS_CELSIUS_NANO_SCALE
#define ST_PRESS_LPS331AP_BDU_ADDR 0x20
#define ST_PRESS_LPS331AP_BDU_MASK 0x04
#define ST_PRESS_LPS331AP_DRDY_IRQ_ADDR 0x22
#define ST_PRESS_LPS331AP_DRDY_IRQ_INT1_MASK 0x04
#define ST_PRESS_LPS331AP_DRDY_IRQ_INT2_MASK 0x20
#define ST_PRESS_LPS331AP_MULTIREAD_BIT true
#define ST_PRESS_LPS331AP_TEMP_OFFSET 42500
/* CUSTOM VALUES FOR LPS001WP SENSOR */
#define ST_PRESS_LPS001WP_WAI_EXP 0xba
#define ST_PRESS_LPS001WP_ODR_ADDR 0x20
#define ST_PRESS_LPS001WP_ODR_MASK 0x30
#define ST_PRESS_LPS001WP_ODR_AVL_1HZ_VAL 0x01
#define ST_PRESS_LPS001WP_ODR_AVL_7HZ_VAL 0x02
#define ST_PRESS_LPS001WP_ODR_AVL_13HZ_VAL 0x03
#define ST_PRESS_LPS001WP_PW_ADDR 0x20
#define ST_PRESS_LPS001WP_PW_MASK 0x40
#define ST_PRESS_LPS001WP_BDU_ADDR 0x20
#define ST_PRESS_LPS001WP_BDU_MASK 0x04
#define ST_PRESS_LPS001WP_MULTIREAD_BIT true
#define ST_PRESS_LPS001WP_OUT_L_ADDR 0x28
#define ST_TEMP_LPS001WP_OUT_L_ADDR 0x2a
/* CUSTOM VALUES FOR LPS25H SENSOR */
#define ST_PRESS_LPS25H_WAI_EXP 0xbd
#define ST_PRESS_LPS25H_ODR_ADDR 0x20
#define ST_PRESS_LPS25H_ODR_MASK 0x70
#define ST_PRESS_LPS25H_ODR_AVL_1HZ_VAL 0x01
#define ST_PRESS_LPS25H_ODR_AVL_7HZ_VAL 0x02
#define ST_PRESS_LPS25H_ODR_AVL_13HZ_VAL 0x03
#define ST_PRESS_LPS25H_ODR_AVL_25HZ_VAL 0x04
#define ST_PRESS_LPS25H_PW_ADDR 0x20
#define ST_PRESS_LPS25H_PW_MASK 0x80
#define ST_PRESS_LPS25H_FS_ADDR 0x00
#define ST_PRESS_LPS25H_FS_MASK 0x00
#define ST_PRESS_LPS25H_FS_AVL_1260_VAL 0x00
#define ST_PRESS_LPS25H_FS_AVL_1260_GAIN ST_PRESS_KPASCAL_NANO_SCALE
#define ST_PRESS_LPS25H_FS_AVL_TEMP_GAIN ST_PRESS_CELSIUS_NANO_SCALE
#define ST_PRESS_LPS25H_BDU_ADDR 0x20
#define ST_PRESS_LPS25H_BDU_MASK 0x04
#define ST_PRESS_LPS25H_DRDY_IRQ_ADDR 0x23
#define ST_PRESS_LPS25H_DRDY_IRQ_INT1_MASK 0x01
#define ST_PRESS_LPS25H_DRDY_IRQ_INT2_MASK 0x10
#define ST_PRESS_LPS25H_MULTIREAD_BIT true
#define ST_PRESS_LPS25H_TEMP_OFFSET 42500
#define ST_PRESS_LPS25H_OUT_XL_ADDR 0x28
#define ST_TEMP_LPS25H_OUT_L_ADDR 0x2b
static const struct iio_chan_spec st_press_1_channels[] = {
{
.type = IIO_PRESSURE,
.channel2 = IIO_NO_MOD,
.address = ST_PRESS_1_OUT_XL_ADDR,
.scan_index = ST_SENSORS_SCAN_X,
.scan_type = {
.sign = 'u',
.realbits = 24,
.storagebits = 24,
.endianness = IIO_LE,
},
.info_mask_separate =
BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
.modified = 0,
},
{
.type = IIO_TEMP,
.channel2 = IIO_NO_MOD,
.address = ST_TEMP_1_OUT_L_ADDR,
.scan_index = -1,
.scan_type = {
.sign = 'u',
.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),
.modified = 0,
},
IIO_CHAN_SOFT_TIMESTAMP(1)
};
static const struct iio_chan_spec st_press_lps001wp_channels[] = {
{
.type = IIO_PRESSURE,
.channel2 = IIO_NO_MOD,
.address = ST_PRESS_LPS001WP_OUT_L_ADDR,
.scan_index = ST_SENSORS_SCAN_X,
.scan_type = {
.sign = 'u',
.realbits = 16,
.storagebits = 16,
.endianness = IIO_LE,
},
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
.modified = 0,
},
{
.type = IIO_TEMP,
.channel2 = IIO_NO_MOD,
.address = ST_TEMP_LPS001WP_OUT_L_ADDR,
.scan_index = -1,
.scan_type = {
.sign = 'u',
.realbits = 16,
.storagebits = 16,
.endianness = IIO_LE,
},
.info_mask_separate =
BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_OFFSET),
.modified = 0,
},
IIO_CHAN_SOFT_TIMESTAMP(1)
};
static const struct st_sensors st_press_sensors[] = {
{
.wai = ST_PRESS_LPS331AP_WAI_EXP,
.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 = ST_PRESS_LPS331AP_ODR_ADDR,
.mask = ST_PRESS_LPS331AP_ODR_MASK,
.odr_avl = {
{ 1, ST_PRESS_LPS331AP_ODR_AVL_1HZ_VAL, },
{ 7, ST_PRESS_LPS331AP_ODR_AVL_7HZ_VAL, },
{ 13, ST_PRESS_LPS331AP_ODR_AVL_13HZ_VAL, },
{ 25, ST_PRESS_LPS331AP_ODR_AVL_25HZ_VAL, },
},
},
.pw = {
.addr = ST_PRESS_LPS331AP_PW_ADDR,
.mask = ST_PRESS_LPS331AP_PW_MASK,
.value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
.value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
},
.fs = {
.addr = ST_PRESS_LPS331AP_FS_ADDR,
.mask = ST_PRESS_LPS331AP_FS_MASK,
.fs_avl = {
[0] = {
.num = ST_PRESS_FS_AVL_1260MB,
.value = ST_PRESS_LPS331AP_FS_AVL_1260_VAL,
.gain = ST_PRESS_LPS331AP_FS_AVL_1260_GAIN,
.gain2 = ST_PRESS_LPS331AP_FS_AVL_TEMP_GAIN,
},
},
},
.bdu = {
.addr = ST_PRESS_LPS331AP_BDU_ADDR,
.mask = ST_PRESS_LPS331AP_BDU_MASK,
},
.drdy_irq = {
.addr = ST_PRESS_LPS331AP_DRDY_IRQ_ADDR,
.mask_int1 = ST_PRESS_LPS331AP_DRDY_IRQ_INT1_MASK,
.mask_int2 = ST_PRESS_LPS331AP_DRDY_IRQ_INT2_MASK,
},
.multi_read_bit = ST_PRESS_LPS331AP_MULTIREAD_BIT,
.bootime = 2,
},
{
.wai = ST_PRESS_LPS001WP_WAI_EXP,
.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 = ST_PRESS_LPS001WP_ODR_ADDR,
.mask = ST_PRESS_LPS001WP_ODR_MASK,
.odr_avl = {
{ 1, ST_PRESS_LPS001WP_ODR_AVL_1HZ_VAL, },
{ 7, ST_PRESS_LPS001WP_ODR_AVL_7HZ_VAL, },
{ 13, ST_PRESS_LPS001WP_ODR_AVL_13HZ_VAL, },
},
},
.pw = {
.addr = ST_PRESS_LPS001WP_PW_ADDR,
.mask = ST_PRESS_LPS001WP_PW_MASK,
.value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
.value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
},
.fs = {
.addr = 0,
},
.bdu = {
.addr = ST_PRESS_LPS001WP_BDU_ADDR,
.mask = ST_PRESS_LPS001WP_BDU_MASK,
},
.drdy_irq = {
.addr = 0,
},
.multi_read_bit = ST_PRESS_LPS001WP_MULTIREAD_BIT,
.bootime = 2,
},
{
.wai = ST_PRESS_LPS25H_WAI_EXP,
.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 = ST_PRESS_LPS25H_ODR_ADDR,
.mask = ST_PRESS_LPS25H_ODR_MASK,
.odr_avl = {
{ 1, ST_PRESS_LPS25H_ODR_AVL_1HZ_VAL, },
{ 7, ST_PRESS_LPS25H_ODR_AVL_7HZ_VAL, },
{ 13, ST_PRESS_LPS25H_ODR_AVL_13HZ_VAL, },
{ 25, ST_PRESS_LPS25H_ODR_AVL_25HZ_VAL, },
},
},
.pw = {
.addr = ST_PRESS_LPS25H_PW_ADDR,
.mask = ST_PRESS_LPS25H_PW_MASK,
.value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
.value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
},
.fs = {
.addr = ST_PRESS_LPS25H_FS_ADDR,
.mask = ST_PRESS_LPS25H_FS_MASK,
.fs_avl = {
[0] = {
.num = ST_PRESS_FS_AVL_1260MB,
.value = ST_PRESS_LPS25H_FS_AVL_1260_VAL,
.gain = ST_PRESS_LPS25H_FS_AVL_1260_GAIN,
.gain2 = ST_PRESS_LPS25H_FS_AVL_TEMP_GAIN,
},
},
},
.bdu = {
.addr = ST_PRESS_LPS25H_BDU_ADDR,
.mask = ST_PRESS_LPS25H_BDU_MASK,
},
.drdy_irq = {
.addr = ST_PRESS_LPS25H_DRDY_IRQ_ADDR,
.mask_int1 = ST_PRESS_LPS25H_DRDY_IRQ_INT1_MASK,
.mask_int2 = ST_PRESS_LPS25H_DRDY_IRQ_INT2_MASK,
},
.multi_read_bit = ST_PRESS_LPS25H_MULTIREAD_BIT,
.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 *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;
case IIO_CHAN_INFO_SAMP_FREQ:
*val = pdata->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,
};
#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,
struct st_sensors_platform_data *plat_data)
{
struct st_sensor_data *pdata = iio_priv(indio_dev);
int irq = pdata->get_irq_data_ready(indio_dev);
int err;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->info = &press_info;
st_sensors_power_enable(indio_dev);
err = st_sensors_check_device_support(indio_dev,
ARRAY_SIZE(st_press_sensors),
st_press_sensors);
if (err < 0)
return err;
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 = pdata->sensor->num_ch;
if (pdata->sensor->fs.addr != 0)
pdata->current_fullscale = (struct st_sensor_fullscale_avl *)
&pdata->sensor->fs.fs_avl[0];
pdata->odr = pdata->sensor->odr.odr_avl[0].hz;
/* Some devices don't support a data ready pin. */
if (!plat_data && pdata->sensor->drdy_irq.addr)
plat_data =
(struct st_sensors_platform_data *)&default_press_pdata;
err = st_sensors_init_sensor(indio_dev, plat_data);
if (err < 0)
return err;
err = st_press_allocate_ring(indio_dev);
if (err < 0)
return err;
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);
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);
st_sensors_power_disable(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);
}
EXPORT_SYMBOL(st_press_common_remove);
MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
MODULE_DESCRIPTION("STMicroelectronics pressures driver");
MODULE_LICENSE("GPL v2");