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linux/drivers/iio/gyro/st_gyro_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

474 lines
13 KiB
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/*
* STMicroelectronics gyroscopes 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/trigger.h>
#include <linux/iio/buffer.h>
#include <linux/iio/common/st_sensors.h>
#include "st_gyro.h"
#define ST_GYRO_NUMBER_DATA_CHANNELS 3
/* DEFAULT VALUE FOR SENSORS */
#define ST_GYRO_DEFAULT_OUT_X_L_ADDR 0x28
#define ST_GYRO_DEFAULT_OUT_Y_L_ADDR 0x2a
#define ST_GYRO_DEFAULT_OUT_Z_L_ADDR 0x2c
/* FULLSCALE */
#define ST_GYRO_FS_AVL_250DPS 250
#define ST_GYRO_FS_AVL_500DPS 500
#define ST_GYRO_FS_AVL_2000DPS 2000
/* CUSTOM VALUES FOR SENSOR 1 */
#define ST_GYRO_1_WAI_EXP 0xd3
#define ST_GYRO_1_ODR_ADDR 0x20
#define ST_GYRO_1_ODR_MASK 0xc0
#define ST_GYRO_1_ODR_AVL_100HZ_VAL 0x00
#define ST_GYRO_1_ODR_AVL_200HZ_VAL 0x01
#define ST_GYRO_1_ODR_AVL_400HZ_VAL 0x02
#define ST_GYRO_1_ODR_AVL_800HZ_VAL 0x03
#define ST_GYRO_1_PW_ADDR 0x20
#define ST_GYRO_1_PW_MASK 0x08
#define ST_GYRO_1_FS_ADDR 0x23
#define ST_GYRO_1_FS_MASK 0x30
#define ST_GYRO_1_FS_AVL_250_VAL 0x00
#define ST_GYRO_1_FS_AVL_500_VAL 0x01
#define ST_GYRO_1_FS_AVL_2000_VAL 0x02
#define ST_GYRO_1_FS_AVL_250_GAIN IIO_DEGREE_TO_RAD(8750)
#define ST_GYRO_1_FS_AVL_500_GAIN IIO_DEGREE_TO_RAD(17500)
#define ST_GYRO_1_FS_AVL_2000_GAIN IIO_DEGREE_TO_RAD(70000)
#define ST_GYRO_1_BDU_ADDR 0x23
#define ST_GYRO_1_BDU_MASK 0x80
#define ST_GYRO_1_DRDY_IRQ_ADDR 0x22
#define ST_GYRO_1_DRDY_IRQ_INT2_MASK 0x08
#define ST_GYRO_1_MULTIREAD_BIT true
/* CUSTOM VALUES FOR SENSOR 2 */
#define ST_GYRO_2_WAI_EXP 0xd4
#define ST_GYRO_2_ODR_ADDR 0x20
#define ST_GYRO_2_ODR_MASK 0xc0
#define ST_GYRO_2_ODR_AVL_95HZ_VAL 0x00
#define ST_GYRO_2_ODR_AVL_190HZ_VAL 0x01
#define ST_GYRO_2_ODR_AVL_380HZ_VAL 0x02
#define ST_GYRO_2_ODR_AVL_760HZ_VAL 0x03
#define ST_GYRO_2_PW_ADDR 0x20
#define ST_GYRO_2_PW_MASK 0x08
#define ST_GYRO_2_FS_ADDR 0x23
#define ST_GYRO_2_FS_MASK 0x30
#define ST_GYRO_2_FS_AVL_250_VAL 0x00
#define ST_GYRO_2_FS_AVL_500_VAL 0x01
#define ST_GYRO_2_FS_AVL_2000_VAL 0x02
#define ST_GYRO_2_FS_AVL_250_GAIN IIO_DEGREE_TO_RAD(8750)
#define ST_GYRO_2_FS_AVL_500_GAIN IIO_DEGREE_TO_RAD(17500)
#define ST_GYRO_2_FS_AVL_2000_GAIN IIO_DEGREE_TO_RAD(70000)
#define ST_GYRO_2_BDU_ADDR 0x23
#define ST_GYRO_2_BDU_MASK 0x80
#define ST_GYRO_2_DRDY_IRQ_ADDR 0x22
#define ST_GYRO_2_DRDY_IRQ_INT2_MASK 0x08
#define ST_GYRO_2_MULTIREAD_BIT true
/* CUSTOM VALUES FOR SENSOR 3 */
#define ST_GYRO_3_WAI_EXP 0xd7
#define ST_GYRO_3_ODR_ADDR 0x20
#define ST_GYRO_3_ODR_MASK 0xc0
#define ST_GYRO_3_ODR_AVL_95HZ_VAL 0x00
#define ST_GYRO_3_ODR_AVL_190HZ_VAL 0x01
#define ST_GYRO_3_ODR_AVL_380HZ_VAL 0x02
#define ST_GYRO_3_ODR_AVL_760HZ_VAL 0x03
#define ST_GYRO_3_PW_ADDR 0x20
#define ST_GYRO_3_PW_MASK 0x08
#define ST_GYRO_3_FS_ADDR 0x23
#define ST_GYRO_3_FS_MASK 0x30
#define ST_GYRO_3_FS_AVL_250_VAL 0x00
#define ST_GYRO_3_FS_AVL_500_VAL 0x01
#define ST_GYRO_3_FS_AVL_2000_VAL 0x02
#define ST_GYRO_3_FS_AVL_250_GAIN IIO_DEGREE_TO_RAD(8750)
#define ST_GYRO_3_FS_AVL_500_GAIN IIO_DEGREE_TO_RAD(17500)
#define ST_GYRO_3_FS_AVL_2000_GAIN IIO_DEGREE_TO_RAD(70000)
#define ST_GYRO_3_BDU_ADDR 0x23
#define ST_GYRO_3_BDU_MASK 0x80
#define ST_GYRO_3_DRDY_IRQ_ADDR 0x22
#define ST_GYRO_3_DRDY_IRQ_INT2_MASK 0x08
#define ST_GYRO_3_MULTIREAD_BIT true
static const struct iio_chan_spec st_gyro_16bit_channels[] = {
ST_SENSORS_LSM_CHANNELS(IIO_ANGL_VEL,
BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
ST_SENSORS_SCAN_X, 1, IIO_MOD_X, 's', IIO_LE, 16, 16,
ST_GYRO_DEFAULT_OUT_X_L_ADDR),
ST_SENSORS_LSM_CHANNELS(IIO_ANGL_VEL,
BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
ST_SENSORS_SCAN_Y, 1, IIO_MOD_Y, 's', IIO_LE, 16, 16,
ST_GYRO_DEFAULT_OUT_Y_L_ADDR),
ST_SENSORS_LSM_CHANNELS(IIO_ANGL_VEL,
BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
ST_SENSORS_SCAN_Z, 1, IIO_MOD_Z, 's', IIO_LE, 16, 16,
ST_GYRO_DEFAULT_OUT_Z_L_ADDR),
IIO_CHAN_SOFT_TIMESTAMP(3)
};
static const struct st_sensor_settings st_gyro_sensors_settings[] = {
{
.wai = ST_GYRO_1_WAI_EXP,
.sensors_supported = {
[0] = L3G4200D_GYRO_DEV_NAME,
[1] = LSM330DL_GYRO_DEV_NAME,
},
.ch = (struct iio_chan_spec *)st_gyro_16bit_channels,
.odr = {
.addr = ST_GYRO_1_ODR_ADDR,
.mask = ST_GYRO_1_ODR_MASK,
.odr_avl = {
{ 100, ST_GYRO_1_ODR_AVL_100HZ_VAL, },
{ 200, ST_GYRO_1_ODR_AVL_200HZ_VAL, },
{ 400, ST_GYRO_1_ODR_AVL_400HZ_VAL, },
{ 800, ST_GYRO_1_ODR_AVL_800HZ_VAL, },
},
},
.pw = {
.addr = ST_GYRO_1_PW_ADDR,
.mask = ST_GYRO_1_PW_MASK,
.value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
.value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
},
.enable_axis = {
.addr = ST_SENSORS_DEFAULT_AXIS_ADDR,
.mask = ST_SENSORS_DEFAULT_AXIS_MASK,
},
.fs = {
.addr = ST_GYRO_1_FS_ADDR,
.mask = ST_GYRO_1_FS_MASK,
.fs_avl = {
[0] = {
.num = ST_GYRO_FS_AVL_250DPS,
.value = ST_GYRO_1_FS_AVL_250_VAL,
.gain = ST_GYRO_1_FS_AVL_250_GAIN,
},
[1] = {
.num = ST_GYRO_FS_AVL_500DPS,
.value = ST_GYRO_1_FS_AVL_500_VAL,
.gain = ST_GYRO_1_FS_AVL_500_GAIN,
},
[2] = {
.num = ST_GYRO_FS_AVL_2000DPS,
.value = ST_GYRO_1_FS_AVL_2000_VAL,
.gain = ST_GYRO_1_FS_AVL_2000_GAIN,
},
},
},
.bdu = {
.addr = ST_GYRO_1_BDU_ADDR,
.mask = ST_GYRO_1_BDU_MASK,
},
.drdy_irq = {
.addr = ST_GYRO_1_DRDY_IRQ_ADDR,
.mask_int2 = ST_GYRO_1_DRDY_IRQ_INT2_MASK,
},
.multi_read_bit = ST_GYRO_1_MULTIREAD_BIT,
.bootime = 2,
},
{
.wai = ST_GYRO_2_WAI_EXP,
.sensors_supported = {
[0] = L3GD20_GYRO_DEV_NAME,
[1] = LSM330D_GYRO_DEV_NAME,
[2] = LSM330DLC_GYRO_DEV_NAME,
[3] = L3G4IS_GYRO_DEV_NAME,
[4] = LSM330_GYRO_DEV_NAME,
},
.ch = (struct iio_chan_spec *)st_gyro_16bit_channels,
.odr = {
.addr = ST_GYRO_2_ODR_ADDR,
.mask = ST_GYRO_2_ODR_MASK,
.odr_avl = {
{ 95, ST_GYRO_2_ODR_AVL_95HZ_VAL, },
{ 190, ST_GYRO_2_ODR_AVL_190HZ_VAL, },
{ 380, ST_GYRO_2_ODR_AVL_380HZ_VAL, },
{ 760, ST_GYRO_2_ODR_AVL_760HZ_VAL, },
},
},
.pw = {
.addr = ST_GYRO_2_PW_ADDR,
.mask = ST_GYRO_2_PW_MASK,
.value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
.value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
},
.enable_axis = {
.addr = ST_SENSORS_DEFAULT_AXIS_ADDR,
.mask = ST_SENSORS_DEFAULT_AXIS_MASK,
},
.fs = {
.addr = ST_GYRO_2_FS_ADDR,
.mask = ST_GYRO_2_FS_MASK,
.fs_avl = {
[0] = {
.num = ST_GYRO_FS_AVL_250DPS,
.value = ST_GYRO_2_FS_AVL_250_VAL,
.gain = ST_GYRO_2_FS_AVL_250_GAIN,
},
[1] = {
.num = ST_GYRO_FS_AVL_500DPS,
.value = ST_GYRO_2_FS_AVL_500_VAL,
.gain = ST_GYRO_2_FS_AVL_500_GAIN,
},
[2] = {
.num = ST_GYRO_FS_AVL_2000DPS,
.value = ST_GYRO_2_FS_AVL_2000_VAL,
.gain = ST_GYRO_2_FS_AVL_2000_GAIN,
},
},
},
.bdu = {
.addr = ST_GYRO_2_BDU_ADDR,
.mask = ST_GYRO_2_BDU_MASK,
},
.drdy_irq = {
.addr = ST_GYRO_2_DRDY_IRQ_ADDR,
.mask_int2 = ST_GYRO_2_DRDY_IRQ_INT2_MASK,
},
.multi_read_bit = ST_GYRO_2_MULTIREAD_BIT,
.bootime = 2,
},
{
.wai = ST_GYRO_3_WAI_EXP,
.sensors_supported = {
[0] = L3GD20_GYRO_DEV_NAME,
},
.ch = (struct iio_chan_spec *)st_gyro_16bit_channels,
.odr = {
.addr = ST_GYRO_3_ODR_ADDR,
.mask = ST_GYRO_3_ODR_MASK,
.odr_avl = {
{ 95, ST_GYRO_3_ODR_AVL_95HZ_VAL, },
{ 190, ST_GYRO_3_ODR_AVL_190HZ_VAL, },
{ 380, ST_GYRO_3_ODR_AVL_380HZ_VAL, },
{ 760, ST_GYRO_3_ODR_AVL_760HZ_VAL, },
},
},
.pw = {
.addr = ST_GYRO_3_PW_ADDR,
.mask = ST_GYRO_3_PW_MASK,
.value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
.value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
},
.enable_axis = {
.addr = ST_SENSORS_DEFAULT_AXIS_ADDR,
.mask = ST_SENSORS_DEFAULT_AXIS_MASK,
},
.fs = {
.addr = ST_GYRO_3_FS_ADDR,
.mask = ST_GYRO_3_FS_MASK,
.fs_avl = {
[0] = {
.num = ST_GYRO_FS_AVL_250DPS,
.value = ST_GYRO_3_FS_AVL_250_VAL,
.gain = ST_GYRO_3_FS_AVL_250_GAIN,
},
[1] = {
.num = ST_GYRO_FS_AVL_500DPS,
.value = ST_GYRO_3_FS_AVL_500_VAL,
.gain = ST_GYRO_3_FS_AVL_500_GAIN,
},
[2] = {
.num = ST_GYRO_FS_AVL_2000DPS,
.value = ST_GYRO_3_FS_AVL_2000_VAL,
.gain = ST_GYRO_3_FS_AVL_2000_GAIN,
},
},
},
.bdu = {
.addr = ST_GYRO_3_BDU_ADDR,
.mask = ST_GYRO_3_BDU_MASK,
},
.drdy_irq = {
.addr = ST_GYRO_3_DRDY_IRQ_ADDR,
.mask_int2 = ST_GYRO_3_DRDY_IRQ_INT2_MASK,
},
.multi_read_bit = ST_GYRO_3_MULTIREAD_BIT,
.bootime = 2,
},
};
static int st_gyro_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 *gdata = 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;
*val2 = gdata->current_fullscale->gain;
return IIO_VAL_INT_PLUS_MICRO;
case IIO_CHAN_INFO_SAMP_FREQ:
*val = gdata->odr;
return IIO_VAL_INT;
default:
return -EINVAL;
}
read_error:
return err;
}
static int st_gyro_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_anglvel_scale_available);
static struct attribute *st_gyro_attributes[] = {
&iio_dev_attr_sampling_frequency_available.dev_attr.attr,
&iio_dev_attr_in_anglvel_scale_available.dev_attr.attr,
NULL,
};
static const struct attribute_group st_gyro_attribute_group = {
.attrs = st_gyro_attributes,
};
static const struct iio_info gyro_info = {
.driver_module = THIS_MODULE,
.attrs = &st_gyro_attribute_group,
.read_raw = &st_gyro_read_raw,
.write_raw = &st_gyro_write_raw,
};
#ifdef CONFIG_IIO_TRIGGER
static const struct iio_trigger_ops st_gyro_trigger_ops = {
.owner = THIS_MODULE,
.set_trigger_state = ST_GYRO_TRIGGER_SET_STATE,
};
#define ST_GYRO_TRIGGER_OPS (&st_gyro_trigger_ops)
#else
#define ST_GYRO_TRIGGER_OPS NULL
#endif
int st_gyro_common_probe(struct iio_dev *indio_dev)
{
struct st_sensor_data *gdata = iio_priv(indio_dev);
int irq = gdata->get_irq_data_ready(indio_dev);
int err;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->info = &gyro_info;
mutex_init(&gdata->tb.buf_lock);
st_sensors_power_enable(indio_dev);
err = st_sensors_check_device_support(indio_dev,
ARRAY_SIZE(st_gyro_sensors_settings),
st_gyro_sensors_settings);
if (err < 0)
return err;
gdata->num_data_channels = ST_GYRO_NUMBER_DATA_CHANNELS;
gdata->multiread_bit = gdata->sensor_settings->multi_read_bit;
indio_dev->channels = gdata->sensor_settings->ch;
indio_dev->num_channels = ST_SENSORS_NUMBER_ALL_CHANNELS;
gdata->current_fullscale = (struct st_sensor_fullscale_avl *)
&gdata->sensor_settings->fs.fs_avl[0];
gdata->odr = gdata->sensor_settings->odr.odr_avl[0].hz;
err = st_sensors_init_sensor(indio_dev,
(struct st_sensors_platform_data *)&gyro_pdata);
if (err < 0)
return err;
err = st_gyro_allocate_ring(indio_dev);
if (err < 0)
return err;
if (irq > 0) {
err = st_sensors_allocate_trigger(indio_dev,
ST_GYRO_TRIGGER_OPS);
if (err < 0)
goto st_gyro_probe_trigger_error;
}
err = iio_device_register(indio_dev);
if (err)
goto st_gyro_device_register_error;
dev_info(&indio_dev->dev, "registered gyroscope %s\n",
indio_dev->name);
return 0;
st_gyro_device_register_error:
if (irq > 0)
st_sensors_deallocate_trigger(indio_dev);
st_gyro_probe_trigger_error:
st_gyro_deallocate_ring(indio_dev);
return err;
}
EXPORT_SYMBOL(st_gyro_common_probe);
void st_gyro_common_remove(struct iio_dev *indio_dev)
{
struct st_sensor_data *gdata = iio_priv(indio_dev);
st_sensors_power_disable(indio_dev);
iio_device_unregister(indio_dev);
if (gdata->get_irq_data_ready(indio_dev) > 0)
st_sensors_deallocate_trigger(indio_dev);
st_gyro_deallocate_ring(indio_dev);
}
EXPORT_SYMBOL(st_gyro_common_remove);
MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
MODULE_DESCRIPTION("STMicroelectronics gyroscopes driver");
MODULE_LICENSE("GPL v2");
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