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linux/drivers/iio/magnetometer/st_magn_core.c
Alban Bedel 8e71c04f86 iio:st_sensors: Fix oops when probing SPI devices 
In SPI mode the transfer buffer is locked with a mutex. However this
mutex is only initilized after the probe, but some transfer needs to
be done in the probe.

To fix this bug we move the mutex initialization at the beginning of
the device probe.

Signed-off-by: Alban Bedel <alban.bedel@avionic-design.de>
Acked-by: Denis Ciocca <denis.ciocca@st.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2015-04-26 18:24:08 +01:00

441 lines
12 KiB
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/*
* STMicroelectronics magnetometers driver
*
* Copyright 2012-2013 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/buffer.h>
#include <linux/iio/common/st_sensors.h>
#include "st_magn.h"
#define ST_MAGN_NUMBER_DATA_CHANNELS 3
/* DEFAULT VALUE FOR SENSORS */
#define ST_MAGN_DEFAULT_OUT_X_H_ADDR 0X03
#define ST_MAGN_DEFAULT_OUT_Y_H_ADDR 0X07
#define ST_MAGN_DEFAULT_OUT_Z_H_ADDR 0X05
/* FULLSCALE */
#define ST_MAGN_FS_AVL_1300MG 1300
#define ST_MAGN_FS_AVL_1900MG 1900
#define ST_MAGN_FS_AVL_2500MG 2500
#define ST_MAGN_FS_AVL_4000MG 4000
#define ST_MAGN_FS_AVL_4700MG 4700
#define ST_MAGN_FS_AVL_5600MG 5600
#define ST_MAGN_FS_AVL_8000MG 8000
#define ST_MAGN_FS_AVL_8100MG 8100
#define ST_MAGN_FS_AVL_12000MG 12000
#define ST_MAGN_FS_AVL_16000MG 16000
/* CUSTOM VALUES FOR SENSOR 1 */
#define ST_MAGN_1_WAI_EXP 0x3c
#define ST_MAGN_1_ODR_ADDR 0x00
#define ST_MAGN_1_ODR_MASK 0x1c
#define ST_MAGN_1_ODR_AVL_1HZ_VAL 0x00
#define ST_MAGN_1_ODR_AVL_2HZ_VAL 0x01
#define ST_MAGN_1_ODR_AVL_3HZ_VAL 0x02
#define ST_MAGN_1_ODR_AVL_8HZ_VAL 0x03
#define ST_MAGN_1_ODR_AVL_15HZ_VAL 0x04
#define ST_MAGN_1_ODR_AVL_30HZ_VAL 0x05
#define ST_MAGN_1_ODR_AVL_75HZ_VAL 0x06
#define ST_MAGN_1_ODR_AVL_220HZ_VAL 0x07
#define ST_MAGN_1_PW_ADDR 0x02
#define ST_MAGN_1_PW_MASK 0x03
#define ST_MAGN_1_PW_ON 0x00
#define ST_MAGN_1_PW_OFF 0x03
#define ST_MAGN_1_FS_ADDR 0x01
#define ST_MAGN_1_FS_MASK 0xe0
#define ST_MAGN_1_FS_AVL_1300_VAL 0x01
#define ST_MAGN_1_FS_AVL_1900_VAL 0x02
#define ST_MAGN_1_FS_AVL_2500_VAL 0x03
#define ST_MAGN_1_FS_AVL_4000_VAL 0x04
#define ST_MAGN_1_FS_AVL_4700_VAL 0x05
#define ST_MAGN_1_FS_AVL_5600_VAL 0x06
#define ST_MAGN_1_FS_AVL_8100_VAL 0x07
#define ST_MAGN_1_FS_AVL_1300_GAIN_XY 909
#define ST_MAGN_1_FS_AVL_1900_GAIN_XY 1169
#define ST_MAGN_1_FS_AVL_2500_GAIN_XY 1492
#define ST_MAGN_1_FS_AVL_4000_GAIN_XY 2222
#define ST_MAGN_1_FS_AVL_4700_GAIN_XY 2500
#define ST_MAGN_1_FS_AVL_5600_GAIN_XY 3030
#define ST_MAGN_1_FS_AVL_8100_GAIN_XY 4347
#define ST_MAGN_1_FS_AVL_1300_GAIN_Z 1020
#define ST_MAGN_1_FS_AVL_1900_GAIN_Z 1315
#define ST_MAGN_1_FS_AVL_2500_GAIN_Z 1666
#define ST_MAGN_1_FS_AVL_4000_GAIN_Z 2500
#define ST_MAGN_1_FS_AVL_4700_GAIN_Z 2816
#define ST_MAGN_1_FS_AVL_5600_GAIN_Z 3389
#define ST_MAGN_1_FS_AVL_8100_GAIN_Z 4878
#define ST_MAGN_1_MULTIREAD_BIT false
/* CUSTOM VALUES FOR SENSOR 2 */
#define ST_MAGN_2_WAI_EXP 0x3d
#define ST_MAGN_2_ODR_ADDR 0x20
#define ST_MAGN_2_ODR_MASK 0x1c
#define ST_MAGN_2_ODR_AVL_1HZ_VAL 0x00
#define ST_MAGN_2_ODR_AVL_2HZ_VAL 0x01
#define ST_MAGN_2_ODR_AVL_3HZ_VAL 0x02
#define ST_MAGN_2_ODR_AVL_5HZ_VAL 0x03
#define ST_MAGN_2_ODR_AVL_10HZ_VAL 0x04
#define ST_MAGN_2_ODR_AVL_20HZ_VAL 0x05
#define ST_MAGN_2_ODR_AVL_40HZ_VAL 0x06
#define ST_MAGN_2_ODR_AVL_80HZ_VAL 0x07
#define ST_MAGN_2_PW_ADDR 0x22
#define ST_MAGN_2_PW_MASK 0x03
#define ST_MAGN_2_PW_ON 0x00
#define ST_MAGN_2_PW_OFF 0x03
#define ST_MAGN_2_FS_ADDR 0x21
#define ST_MAGN_2_FS_MASK 0x60
#define ST_MAGN_2_FS_AVL_4000_VAL 0x00
#define ST_MAGN_2_FS_AVL_8000_VAL 0x01
#define ST_MAGN_2_FS_AVL_12000_VAL 0x02
#define ST_MAGN_2_FS_AVL_16000_VAL 0x03
#define ST_MAGN_2_FS_AVL_4000_GAIN 146
#define ST_MAGN_2_FS_AVL_8000_GAIN 292
#define ST_MAGN_2_FS_AVL_12000_GAIN 438
#define ST_MAGN_2_FS_AVL_16000_GAIN 584
#define ST_MAGN_2_MULTIREAD_BIT false
#define ST_MAGN_2_OUT_X_L_ADDR 0x28
#define ST_MAGN_2_OUT_Y_L_ADDR 0x2a
#define ST_MAGN_2_OUT_Z_L_ADDR 0x2c
static const struct iio_chan_spec st_magn_16bit_channels[] = {
ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
ST_SENSORS_SCAN_X, 1, IIO_MOD_X, 's', IIO_BE, 16, 16,
ST_MAGN_DEFAULT_OUT_X_H_ADDR),
ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
ST_SENSORS_SCAN_Y, 1, IIO_MOD_Y, 's', IIO_BE, 16, 16,
ST_MAGN_DEFAULT_OUT_Y_H_ADDR),
ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
ST_SENSORS_SCAN_Z, 1, IIO_MOD_Z, 's', IIO_BE, 16, 16,
ST_MAGN_DEFAULT_OUT_Z_H_ADDR),
IIO_CHAN_SOFT_TIMESTAMP(3)
};
static const struct iio_chan_spec st_magn_2_16bit_channels[] = {
ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
ST_SENSORS_SCAN_X, 1, IIO_MOD_X, 's', IIO_LE, 16, 16,
ST_MAGN_2_OUT_X_L_ADDR),
ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
ST_SENSORS_SCAN_Y, 1, IIO_MOD_Y, 's', IIO_LE, 16, 16,
ST_MAGN_2_OUT_Y_L_ADDR),
ST_SENSORS_LSM_CHANNELS(IIO_MAGN,
BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
ST_SENSORS_SCAN_Z, 1, IIO_MOD_Z, 's', IIO_LE, 16, 16,
ST_MAGN_2_OUT_Z_L_ADDR),
IIO_CHAN_SOFT_TIMESTAMP(3)
};
static const struct st_sensor_settings st_magn_sensors_settings[] = {
{
.wai = ST_MAGN_1_WAI_EXP,
.sensors_supported = {
[0] = LSM303DLHC_MAGN_DEV_NAME,
[1] = LSM303DLM_MAGN_DEV_NAME,
},
.ch = (struct iio_chan_spec *)st_magn_16bit_channels,
.odr = {
.addr = ST_MAGN_1_ODR_ADDR,
.mask = ST_MAGN_1_ODR_MASK,
.odr_avl = {
{ 1, ST_MAGN_1_ODR_AVL_1HZ_VAL, },
{ 2, ST_MAGN_1_ODR_AVL_2HZ_VAL, },
{ 3, ST_MAGN_1_ODR_AVL_3HZ_VAL, },
{ 8, ST_MAGN_1_ODR_AVL_8HZ_VAL, },
{ 15, ST_MAGN_1_ODR_AVL_15HZ_VAL, },
{ 30, ST_MAGN_1_ODR_AVL_30HZ_VAL, },
{ 75, ST_MAGN_1_ODR_AVL_75HZ_VAL, },
{ 220, ST_MAGN_1_ODR_AVL_220HZ_VAL, },
},
},
.pw = {
.addr = ST_MAGN_1_PW_ADDR,
.mask = ST_MAGN_1_PW_MASK,
.value_on = ST_MAGN_1_PW_ON,
.value_off = ST_MAGN_1_PW_OFF,
},
.fs = {
.addr = ST_MAGN_1_FS_ADDR,
.mask = ST_MAGN_1_FS_MASK,
.fs_avl = {
[0] = {
.num = ST_MAGN_FS_AVL_1300MG,
.value = ST_MAGN_1_FS_AVL_1300_VAL,
.gain = ST_MAGN_1_FS_AVL_1300_GAIN_XY,
.gain2 = ST_MAGN_1_FS_AVL_1300_GAIN_Z,
},
[1] = {
.num = ST_MAGN_FS_AVL_1900MG,
.value = ST_MAGN_1_FS_AVL_1900_VAL,
.gain = ST_MAGN_1_FS_AVL_1900_GAIN_XY,
.gain2 = ST_MAGN_1_FS_AVL_1900_GAIN_Z,
},
[2] = {
.num = ST_MAGN_FS_AVL_2500MG,
.value = ST_MAGN_1_FS_AVL_2500_VAL,
.gain = ST_MAGN_1_FS_AVL_2500_GAIN_XY,
.gain2 = ST_MAGN_1_FS_AVL_2500_GAIN_Z,
},
[3] = {
.num = ST_MAGN_FS_AVL_4000MG,
.value = ST_MAGN_1_FS_AVL_4000_VAL,
.gain = ST_MAGN_1_FS_AVL_4000_GAIN_XY,
.gain2 = ST_MAGN_1_FS_AVL_4000_GAIN_Z,
},
[4] = {
.num = ST_MAGN_FS_AVL_4700MG,
.value = ST_MAGN_1_FS_AVL_4700_VAL,
.gain = ST_MAGN_1_FS_AVL_4700_GAIN_XY,
.gain2 = ST_MAGN_1_FS_AVL_4700_GAIN_Z,
},
[5] = {
.num = ST_MAGN_FS_AVL_5600MG,
.value = ST_MAGN_1_FS_AVL_5600_VAL,
.gain = ST_MAGN_1_FS_AVL_5600_GAIN_XY,
.gain2 = ST_MAGN_1_FS_AVL_5600_GAIN_Z,
},
[6] = {
.num = ST_MAGN_FS_AVL_8100MG,
.value = ST_MAGN_1_FS_AVL_8100_VAL,
.gain = ST_MAGN_1_FS_AVL_8100_GAIN_XY,
.gain2 = ST_MAGN_1_FS_AVL_8100_GAIN_Z,
},
},
},
.multi_read_bit = ST_MAGN_1_MULTIREAD_BIT,
.bootime = 2,
},
{
.wai = ST_MAGN_2_WAI_EXP,
.sensors_supported = {
[0] = LIS3MDL_MAGN_DEV_NAME,
},
.ch = (struct iio_chan_spec *)st_magn_2_16bit_channels,
.odr = {
.addr = ST_MAGN_2_ODR_ADDR,
.mask = ST_MAGN_2_ODR_MASK,
.odr_avl = {
{ 1, ST_MAGN_2_ODR_AVL_1HZ_VAL, },
{ 2, ST_MAGN_2_ODR_AVL_2HZ_VAL, },
{ 3, ST_MAGN_2_ODR_AVL_3HZ_VAL, },
{ 5, ST_MAGN_2_ODR_AVL_5HZ_VAL, },
{ 10, ST_MAGN_2_ODR_AVL_10HZ_VAL, },
{ 20, ST_MAGN_2_ODR_AVL_20HZ_VAL, },
{ 40, ST_MAGN_2_ODR_AVL_40HZ_VAL, },
{ 80, ST_MAGN_2_ODR_AVL_80HZ_VAL, },
},
},
.pw = {
.addr = ST_MAGN_2_PW_ADDR,
.mask = ST_MAGN_2_PW_MASK,
.value_on = ST_MAGN_2_PW_ON,
.value_off = ST_MAGN_2_PW_OFF,
},
.fs = {
.addr = ST_MAGN_2_FS_ADDR,
.mask = ST_MAGN_2_FS_MASK,
.fs_avl = {
[0] = {
.num = ST_MAGN_FS_AVL_4000MG,
.value = ST_MAGN_2_FS_AVL_4000_VAL,
.gain = ST_MAGN_2_FS_AVL_4000_GAIN,
},
[1] = {
.num = ST_MAGN_FS_AVL_8000MG,
.value = ST_MAGN_2_FS_AVL_8000_VAL,
.gain = ST_MAGN_2_FS_AVL_8000_GAIN,
},
[2] = {
.num = ST_MAGN_FS_AVL_12000MG,
.value = ST_MAGN_2_FS_AVL_12000_VAL,
.gain = ST_MAGN_2_FS_AVL_12000_GAIN,
},
[3] = {
.num = ST_MAGN_FS_AVL_16000MG,
.value = ST_MAGN_2_FS_AVL_16000_VAL,
.gain = ST_MAGN_2_FS_AVL_16000_GAIN,
},
},
},
.multi_read_bit = ST_MAGN_2_MULTIREAD_BIT,
.bootime = 2,
},
};
static int st_magn_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 *mdata = 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;
if ((ch->scan_index == ST_SENSORS_SCAN_Z) &&
(mdata->current_fullscale->gain2 != 0))
*val2 = mdata->current_fullscale->gain2;
else
*val2 = mdata->current_fullscale->gain;
return IIO_VAL_INT_PLUS_MICRO;
case IIO_CHAN_INFO_SAMP_FREQ:
*val = mdata->odr;
return IIO_VAL_INT;
default:
return -EINVAL;
}
read_error:
return err;
}
static int st_magn_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan, int val, int val2, long mask)
{
int err;
switch (mask) {
case IIO_CHAN_INFO_SCALE:
err = st_sensors_set_fullscale_by_gain(indio_dev, val2);
break;
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:
err = -EINVAL;
}
return err;
}
static ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL();
static ST_SENSORS_DEV_ATTR_SCALE_AVAIL(in_magn_scale_available);
static struct attribute *st_magn_attributes[] = {
&iio_dev_attr_sampling_frequency_available.dev_attr.attr,
&iio_dev_attr_in_magn_scale_available.dev_attr.attr,
NULL,
};
static const struct attribute_group st_magn_attribute_group = {
.attrs = st_magn_attributes,
};
static const struct iio_info magn_info = {
.driver_module = THIS_MODULE,
.attrs = &st_magn_attribute_group,
.read_raw = &st_magn_read_raw,
.write_raw = &st_magn_write_raw,
};
int st_magn_common_probe(struct iio_dev *indio_dev)
{
struct st_sensor_data *mdata = iio_priv(indio_dev);
int irq = mdata->get_irq_data_ready(indio_dev);
int err;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->info = &magn_info;
mutex_init(&mdata->tb.buf_lock);
st_sensors_power_enable(indio_dev);
err = st_sensors_check_device_support(indio_dev,
ARRAY_SIZE(st_magn_sensors_settings),
st_magn_sensors_settings);
if (err < 0)
return err;
mdata->num_data_channels = ST_MAGN_NUMBER_DATA_CHANNELS;
mdata->multiread_bit = mdata->sensor_settings->multi_read_bit;
indio_dev->channels = mdata->sensor_settings->ch;
indio_dev->num_channels = ST_SENSORS_NUMBER_ALL_CHANNELS;
mdata->current_fullscale = (struct st_sensor_fullscale_avl *)
&mdata->sensor_settings->fs.fs_avl[0];
mdata->odr = mdata->sensor_settings->odr.odr_avl[0].hz;
err = st_sensors_init_sensor(indio_dev, NULL);
if (err < 0)
return err;
err = st_magn_allocate_ring(indio_dev);
if (err < 0)
return err;
if (irq > 0) {
err = st_sensors_allocate_trigger(indio_dev, NULL);
if (err < 0)
goto st_magn_probe_trigger_error;
}
err = iio_device_register(indio_dev);
if (err)
goto st_magn_device_register_error;
dev_info(&indio_dev->dev, "registered magnetometer %s\n",
indio_dev->name);
return 0;
st_magn_device_register_error:
if (irq > 0)
st_sensors_deallocate_trigger(indio_dev);
st_magn_probe_trigger_error:
st_magn_deallocate_ring(indio_dev);
return err;
}
EXPORT_SYMBOL(st_magn_common_probe);
void st_magn_common_remove(struct iio_dev *indio_dev)
{
struct st_sensor_data *mdata = iio_priv(indio_dev);
st_sensors_power_disable(indio_dev);
iio_device_unregister(indio_dev);
if (mdata->get_irq_data_ready(indio_dev) > 0)
st_sensors_deallocate_trigger(indio_dev);
st_magn_deallocate_ring(indio_dev);
}
EXPORT_SYMBOL(st_magn_common_remove);
MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
MODULE_DESCRIPTION("STMicroelectronics magnetometers driver");
MODULE_LICENSE("GPL v2");
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