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linux/drivers/iio/magnetometer/st_magn_core.c
Alexandru Ardelean e426965154 iio: st_sensors: remove reference to parent device object on st_sensor_data 
The idea behind it, is that all devm_ calls in ST sensors are bound to the
parent device object.

However, the reference to that object is kept on both the st_sensor_data
struct and the IIO object parent (indio_dev->dev.parent).

This change only adds a bit consistency and uses the reference stored on
indio_dev->dev.parent, to enforce the assumption that all ST sensors' devm_
calls are bound to the same reference as the one store on st_sensor_data.

Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Alexandru Ardelean <aardelean@deviqon.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20210823112204.243255-6-aardelean@deviqon.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2021-09-14 12:00:32 +01:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* STMicroelectronics magnetometers driver
*
* Copyright 2012-2013 STMicroelectronics Inc.
*
* Denis Ciocca <denis.ciocca@st.com>
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/sysfs.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/trigger.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_2000MG 2000
#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_15000MG 15000
#define ST_MAGN_FS_AVL_16000MG 16000
/* Special L addresses for Sensor 2 */
#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
/* Special L addresses for sensor 3 */
#define ST_MAGN_3_OUT_X_L_ADDR 0x68
#define ST_MAGN_3_OUT_Y_L_ADDR 0x6a
#define ST_MAGN_3_OUT_Z_L_ADDR 0x6c
/* Special L addresses for sensor 4 */
#define ST_MAGN_4_OUT_X_L_ADDR 0x08
#define ST_MAGN_4_OUT_Y_L_ADDR 0x0a
#define ST_MAGN_4_OUT_Z_L_ADDR 0x0c
static const struct iio_mount_matrix *
st_magn_get_mount_matrix(const struct iio_dev *indio_dev,
const struct iio_chan_spec *chan)
{
struct st_sensor_data *mdata = iio_priv(indio_dev);
return &mdata->mount_matrix;
}
static const struct iio_chan_spec_ext_info st_magn_mount_matrix_ext_info[] = {
IIO_MOUNT_MATRIX(IIO_SHARED_BY_ALL, st_magn_get_mount_matrix),
{ }
};
static const struct iio_chan_spec st_magn_16bit_channels[] = {
ST_SENSORS_LSM_CHANNELS_EXT(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_magn_mount_matrix_ext_info),
ST_SENSORS_LSM_CHANNELS_EXT(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_magn_mount_matrix_ext_info),
ST_SENSORS_LSM_CHANNELS_EXT(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,
st_magn_mount_matrix_ext_info),
IIO_CHAN_SOFT_TIMESTAMP(3)
};
static const struct iio_chan_spec st_magn_2_16bit_channels[] = {
ST_SENSORS_LSM_CHANNELS_EXT(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_magn_mount_matrix_ext_info),
ST_SENSORS_LSM_CHANNELS_EXT(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_magn_mount_matrix_ext_info),
ST_SENSORS_LSM_CHANNELS_EXT(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,
st_magn_mount_matrix_ext_info),
IIO_CHAN_SOFT_TIMESTAMP(3)
};
static const struct iio_chan_spec st_magn_3_16bit_channels[] = {
ST_SENSORS_LSM_CHANNELS_EXT(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_3_OUT_X_L_ADDR,
st_magn_mount_matrix_ext_info),
ST_SENSORS_LSM_CHANNELS_EXT(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_3_OUT_Y_L_ADDR,
st_magn_mount_matrix_ext_info),
ST_SENSORS_LSM_CHANNELS_EXT(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_3_OUT_Z_L_ADDR,
st_magn_mount_matrix_ext_info),
IIO_CHAN_SOFT_TIMESTAMP(3)
};
static const struct iio_chan_spec st_magn_4_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_4_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_4_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_4_OUT_Z_L_ADDR),
IIO_CHAN_SOFT_TIMESTAMP(3)
};
static const struct st_sensor_settings st_magn_sensors_settings[] = {
{
.wai = 0, /* This sensor has no valid WhoAmI report 0 */
.wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
.sensors_supported = {
[0] = LSM303DLH_MAGN_DEV_NAME,
},
.ch = (struct iio_chan_spec *)st_magn_16bit_channels,
.odr = {
.addr = 0x00,
.mask = 0x1c,
.odr_avl = {
{ .hz = 1, .value = 0x00 },
{ .hz = 2, .value = 0x01 },
{ .hz = 3, .value = 0x02 },
{ .hz = 8, .value = 0x03 },
{ .hz = 15, .value = 0x04 },
{ .hz = 30, .value = 0x05 },
{ .hz = 75, .value = 0x06 },
/* 220 Hz, 0x07 reportedly exist */
},
},
.pw = {
.addr = 0x02,
.mask = 0x03,
.value_on = 0x00,
.value_off = 0x03,
},
.fs = {
.addr = 0x01,
.mask = 0xe0,
.fs_avl = {
[0] = {
.num = ST_MAGN_FS_AVL_1300MG,
.value = 0x01,
.gain = 1100,
.gain2 = 980,
},
[1] = {
.num = ST_MAGN_FS_AVL_1900MG,
.value = 0x02,
.gain = 855,
.gain2 = 760,
},
[2] = {
.num = ST_MAGN_FS_AVL_2500MG,
.value = 0x03,
.gain = 670,
.gain2 = 600,
},
[3] = {
.num = ST_MAGN_FS_AVL_4000MG,
.value = 0x04,
.gain = 450,
.gain2 = 400,
},
[4] = {
.num = ST_MAGN_FS_AVL_4700MG,
.value = 0x05,
.gain = 400,
.gain2 = 355,
},
[5] = {
.num = ST_MAGN_FS_AVL_5600MG,
.value = 0x06,
.gain = 330,
.gain2 = 295,
},
[6] = {
.num = ST_MAGN_FS_AVL_8100MG,
.value = 0x07,
.gain = 230,
.gain2 = 205,
},
},
},
.multi_read_bit = false,
.bootime = 2,
},
{
.wai = 0x3c,
.wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
.sensors_supported = {
[0] = LSM303DLHC_MAGN_DEV_NAME,
[1] = LSM303DLM_MAGN_DEV_NAME,
},
.ch = (struct iio_chan_spec *)st_magn_16bit_channels,
.odr = {
.addr = 0x00,
.mask = 0x1c,
.odr_avl = {
{ .hz = 1, .value = 0x00 },
{ .hz = 2, .value = 0x01 },
{ .hz = 3, .value = 0x02 },
{ .hz = 8, .value = 0x03 },
{ .hz = 15, .value = 0x04 },
{ .hz = 30, .value = 0x05 },
{ .hz = 75, .value = 0x06 },
{ .hz = 220, .value = 0x07 },
},
},
.pw = {
.addr = 0x02,
.mask = 0x03,
.value_on = 0x00,
.value_off = 0x03,
},
.fs = {
.addr = 0x01,
.mask = 0xe0,
.fs_avl = {
[0] = {
.num = ST_MAGN_FS_AVL_1300MG,
.value = 0x01,
.gain = 909,
.gain2 = 1020,
},
[1] = {
.num = ST_MAGN_FS_AVL_1900MG,
.value = 0x02,
.gain = 1169,
.gain2 = 1315,
},
[2] = {
.num = ST_MAGN_FS_AVL_2500MG,
.value = 0x03,
.gain = 1492,
.gain2 = 1666,
},
[3] = {
.num = ST_MAGN_FS_AVL_4000MG,
.value = 0x04,
.gain = 2222,
.gain2 = 2500,
},
[4] = {
.num = ST_MAGN_FS_AVL_4700MG,
.value = 0x05,
.gain = 2500,
.gain2 = 2816,
},
[5] = {
.num = ST_MAGN_FS_AVL_5600MG,
.value = 0x06,
.gain = 3030,
.gain2 = 3389,
},
[6] = {
.num = ST_MAGN_FS_AVL_8100MG,
.value = 0x07,
.gain = 4347,
.gain2 = 4878,
},
},
},
.multi_read_bit = false,
.bootime = 2,
},
{
.wai = 0x3d,
.wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
.sensors_supported = {
[0] = LIS3MDL_MAGN_DEV_NAME,
[1] = LSM9DS1_MAGN_DEV_NAME,
},
.ch = (struct iio_chan_spec *)st_magn_2_16bit_channels,
.odr = {
.addr = 0x20,
.mask = 0x1c,
.odr_avl = {
{ .hz = 1, .value = 0x00 },
{ .hz = 2, .value = 0x01 },
{ .hz = 3, .value = 0x02 },
{ .hz = 5, .value = 0x03 },
{ .hz = 10, .value = 0x04 },
{ .hz = 20, .value = 0x05 },
{ .hz = 40, .value = 0x06 },
{ .hz = 80, .value = 0x07 },
},
},
.pw = {
.addr = 0x22,
.mask = 0x03,
.value_on = 0x00,
.value_off = 0x03,
},
.fs = {
.addr = 0x21,
.mask = 0x60,
.fs_avl = {
[0] = {
.num = ST_MAGN_FS_AVL_4000MG,
.value = 0x00,
.gain = 146,
},
[1] = {
.num = ST_MAGN_FS_AVL_8000MG,
.value = 0x01,
.gain = 292,
},
[2] = {
.num = ST_MAGN_FS_AVL_12000MG,
.value = 0x02,
.gain = 438,
},
[3] = {
.num = ST_MAGN_FS_AVL_16000MG,
.value = 0x03,
.gain = 584,
},
},
},
.bdu = {
.addr = 0x24,
.mask = 0x40,
},
.drdy_irq = {
/* drdy line is routed drdy pin */
.stat_drdy = {
.addr = ST_SENSORS_DEFAULT_STAT_ADDR,
.mask = 0x07,
},
},
.sim = {
.addr = 0x22,
.value = BIT(2),
},
.multi_read_bit = true,
.bootime = 2,
},
{
.wai = 0x40,
.wai_addr = 0x4f,
.sensors_supported = {
[0] = LSM303AGR_MAGN_DEV_NAME,
[1] = LIS2MDL_MAGN_DEV_NAME,
[2] = IIS2MDC_MAGN_DEV_NAME,
},
.ch = (struct iio_chan_spec *)st_magn_3_16bit_channels,
.odr = {
.addr = 0x60,
.mask = 0x0c,
.odr_avl = {
{ .hz = 10, .value = 0x00 },
{ .hz = 20, .value = 0x01 },
{ .hz = 50, .value = 0x02 },
{ .hz = 100, .value = 0x03 },
},
},
.pw = {
.addr = 0x60,
.mask = 0x03,
.value_on = 0x00,
.value_off = 0x03,
},
.fs = {
.fs_avl = {
[0] = {
.num = ST_MAGN_FS_AVL_15000MG,
.gain = 1500,
},
},
},
.bdu = {
.addr = 0x62,
.mask = 0x10,
},
.drdy_irq = {
.int1 = {
.addr = 0x62,
.mask = 0x01,
},
.stat_drdy = {
.addr = 0x67,
.mask = 0x07,
},
},
.multi_read_bit = false,
.bootime = 2,
},
{
.wai = 0x49,
.wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
.sensors_supported = {
[0] = LSM9DS0_IMU_DEV_NAME,
},
.ch = (struct iio_chan_spec *)st_magn_4_16bit_channels,
.odr = {
.addr = 0x24,
.mask = GENMASK(4, 2),
.odr_avl = {
{ 3, 0x00, },
{ 6, 0x01, },
{ 12, 0x02, },
{ 25, 0x03, },
{ 50, 0x04, },
{ 100, 0x05, },
},
},
.pw = {
.addr = 0x26,
.mask = GENMASK(1, 0),
.value_on = 0x00,
.value_off = 0x03,
},
.fs = {
.addr = 0x25,
.mask = GENMASK(6, 5),
.fs_avl = {
[0] = {
.num = ST_MAGN_FS_AVL_2000MG,
.value = 0x00,
.gain = 73,
},
[1] = {
.num = ST_MAGN_FS_AVL_4000MG,
.value = 0x01,
.gain = 146,
},
[2] = {
.num = ST_MAGN_FS_AVL_8000MG,
.value = 0x02,
.gain = 292,
},
[3] = {
.num = ST_MAGN_FS_AVL_12000MG,
.value = 0x03,
.gain = 438,
},
},
},
.bdu = {
.addr = 0x20,
.mask = BIT(3),
},
.drdy_irq = {
.int1 = {
.addr = 0x22,
.mask = BIT(1),
},
.int2 = {
.addr = 0x23,
.mask = BIT(2),
},
.stat_drdy = {
.addr = 0x07,
.mask = GENMASK(2, 0),
},
},
.sim = {
.addr = 0x21,
.value = BIT(0),
},
.multi_read_bit = true,
.bootime = 2,
},
};
/* Default magn DRDY is available on INT2 pin */
static const struct st_sensors_platform_data default_magn_pdata = {
.drdy_int_pin = 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 = {
.attrs = &st_magn_attribute_group,
.read_raw = &st_magn_read_raw,
.write_raw = &st_magn_write_raw,
.debugfs_reg_access = &st_sensors_debugfs_reg_access,
};
#ifdef CONFIG_IIO_TRIGGER
static const struct iio_trigger_ops st_magn_trigger_ops = {
.set_trigger_state = ST_MAGN_TRIGGER_SET_STATE,
.validate_device = st_sensors_validate_device,
};
#define ST_MAGN_TRIGGER_OPS (&st_magn_trigger_ops)
#else
#define ST_MAGN_TRIGGER_OPS NULL
#endif
/*
* st_magn_get_settings() - get sensor settings from device name
* @name: device name buffer reference.
*
* Return: valid reference on success, NULL otherwise.
*/
const struct st_sensor_settings *st_magn_get_settings(const char *name)
{
int index = st_sensors_get_settings_index(name,
st_magn_sensors_settings,
ARRAY_SIZE(st_magn_sensors_settings));
if (index < 0)
return NULL;
return &st_magn_sensors_settings[index];
}
EXPORT_SYMBOL(st_magn_get_settings);
int st_magn_common_probe(struct iio_dev *indio_dev)
{
struct st_sensor_data *mdata = iio_priv(indio_dev);
struct device *parent = indio_dev->dev.parent;
struct st_sensors_platform_data *pdata = dev_get_platdata(parent);
int err;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->info = &magn_info;
err = st_sensors_verify_id(indio_dev);
if (err < 0)
return err;
mdata->num_data_channels = ST_MAGN_NUMBER_DATA_CHANNELS;
indio_dev->channels = mdata->sensor_settings->ch;
indio_dev->num_channels = ST_SENSORS_NUMBER_ALL_CHANNELS;
err = iio_read_mount_matrix(parent, &mdata->mount_matrix);
if (err)
return err;
mdata->current_fullscale = &mdata->sensor_settings->fs.fs_avl[0];
mdata->odr = mdata->sensor_settings->odr.odr_avl[0].hz;
if (!pdata)
pdata = (struct st_sensors_platform_data *)&default_magn_pdata;
err = st_sensors_init_sensor(indio_dev, pdata);
if (err < 0)
return err;
err = st_magn_allocate_ring(indio_dev);
if (err < 0)
return err;
if (mdata->irq > 0) {
err = st_sensors_allocate_trigger(indio_dev,
ST_MAGN_TRIGGER_OPS);
if (err < 0)
return err;
}
return devm_iio_device_register(parent, indio_dev);
}
EXPORT_SYMBOL(st_magn_common_probe);
MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
MODULE_DESCRIPTION("STMicroelectronics magnetometers driver");
MODULE_LICENSE("GPL v2");
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