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linux/drivers/iio/pressure/st_pressure_core.c
Linus Walleij ea7e586bdd iio: st_sensors: move regulator retrieveal to core 
Currently the pressure sensor has code to retrieve and enable two
regulators for Vdd and Vdd IO, but actually these voltage inputs
are found on all of these ST sensors, so move the regulator
handling to the core and make sure all the ST sensors call these
functions on probe() and remove() to enable/disable power.

Here also mover over to obtaining the regulator from the *parent*
device of the IIO device, as the IIO device is created on-the-fly
in this very subsystem it very unlikely evert have any regulators
attached to it whatsoever. It is much more likely that the parent
is a platform device, possibly instantiated from a device tree,
which in turn have Vdd and Vdd IO supplied assigned to it.

Cc: Lee Jones <lee.jones@linaro.org>
Cc: Denis CIOCCA <denis.ciocca@st.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2014-04-26 11:52:42 +01:00

474 lines
12 KiB
C
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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_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_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,
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");
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