Commit 6731ca39 authored by Andy Shevchenko's avatar Andy Shevchenko Committed by Jonathan Cameron
Browse files

iio: st_sensors: Add lsm9ds0 IMU support 

We can utilize separate drivers for accelerometer and magnetometer,
so here is the glue driver to enable LSM9DS0 IMU support.

The idea was suggested by Crestez Dan Leonard in [1]. The proposed change
was sent as RFC due to race condition concerns, which are indeed possible.

In order to amend the initial change, I went further by providing a specific
multi-instantiate probe driver that reuses existing accelerometer and
magnetometer.

[1]: https://lore.kernel.org/patchwork/patch/670353/



Suggested-by: default avatarCrestez Dan Leonard <leonard.crestez@intel.com>
Cc: mr.lahorde@laposte.net
Cc: Matija Podravec <matija_podravec@fastmail.fm>
Cc: Sergey Borishchenko <borischenko.sergey@gmail.com>
Signed-off-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20210414195454.84183-6-andriy.shevchenko@linux.intel.com


Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent d61881ef

drivers/iio/accel/st_accel_core.c

+88 −1
Original line number Diff line number Diff line
@@ -980,7 +980,94 @@ static const struct st_sensor_settings st_accel_sensors_settings[] = { 
		.multi_read_bit = true,

		.bootime = 2,

	},



	{

		.wai = 0x49,

		.wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,

		.sensors_supported = {

			[0] = LSM9DS0_IMU_DEV_NAME,

		},

		.ch = (struct iio_chan_spec *)st_accel_16bit_channels,

		.odr = {

			.addr = 0x20,

			.mask = GENMASK(7, 4),

			.odr_avl = {

				{ 3, 0x01, },

				{ 6, 0x02, },

				{ 12, 0x03, },

				{ 25, 0x04, },

				{ 50, 0x05, },

				{ 100, 0x06, },

				{ 200, 0x07, },

				{ 400, 0x08, },

				{ 800, 0x09, },

				{ 1600, 0x0a, },

			},

		},

		.pw = {

			.addr = 0x20,

			.mask = GENMASK(7, 4),

			.value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,

		},

		.enable_axis = {

			.addr = ST_SENSORS_DEFAULT_AXIS_ADDR,

			.mask = ST_SENSORS_DEFAULT_AXIS_MASK,

		},

		.fs = {

			.addr = 0x21,

			.mask = GENMASK(5, 3),

			.fs_avl = {

				[0] = {

					.num = ST_ACCEL_FS_AVL_2G,

					.value = 0x00,

					.gain = IIO_G_TO_M_S_2(61),

				},

				[1] = {

					.num = ST_ACCEL_FS_AVL_4G,

					.value = 0x01,

					.gain = IIO_G_TO_M_S_2(122),

				},

				[2] = {

					.num = ST_ACCEL_FS_AVL_6G,

					.value = 0x02,

					.gain = IIO_G_TO_M_S_2(183),

				},

				[3] = {

					.num = ST_ACCEL_FS_AVL_8G,

					.value = 0x03,

					.gain = IIO_G_TO_M_S_2(244),

				},

				[4] = {

					.num = ST_ACCEL_FS_AVL_16G,

					.value = 0x04,

					.gain = IIO_G_TO_M_S_2(732),

				},

			},

		},

		.bdu = {

			.addr = 0x20,

			.mask = BIT(3),

		},

		.drdy_irq = {

			.int1 = {

				.addr = 0x22,

				.mask = BIT(2),

			},

			.int2 = {

				.addr = 0x23,

				.mask = BIT(3),

			},

			.stat_drdy = {

				.addr = ST_SENSORS_DEFAULT_STAT_ADDR,

				.mask = GENMASK(2, 0),

			},

		},

		.sim = {

			.addr = 0x21,

			.value = BIT(0),

		},

		.multi_read_bit = true,

		.bootime = 2,

	},

};



/* Default accel DRDY is available on INT1 pin */

drivers/iio/imu/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -94,6 +94,7 @@ config KMX61 
source "drivers/iio/imu/inv_icm42600/Kconfig"

source "drivers/iio/imu/inv_mpu6050/Kconfig"

source "drivers/iio/imu/st_lsm6dsx/Kconfig"

source "drivers/iio/imu/st_lsm9ds0/Kconfig"



endmenu

drivers/iio/imu/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -26,3 +26,4 @@ obj-y += inv_mpu6050/ 
obj-$(CONFIG_KMX61) += kmx61.o



obj-y += st_lsm6dsx/

obj-y += st_lsm9ds0/

drivers/iio/imu/st_lsm9ds0/Kconfig

0 → 100644
+28 −0
Original line number Diff line number Diff line 
# SPDX-License-Identifier: GPL-2.0-only



config IIO_ST_LSM9DS0

	tristate "STMicroelectronics LSM9DS0 IMU driver"

	depends on (I2C || SPI_MASTER) && SYSFS

	depends on !SENSORS_LIS3_I2C

	depends on !SENSORS_LIS3_SPI

	select IIO_ST_LSM9DS0_I2C if I2C

	select IIO_ST_LSM9DS0_SPI if SPI_MASTER

	select IIO_ST_ACCEL_3AXIS

	select IIO_ST_MAGN_3AXIS



	help

	  Say yes here to build support for STMicroelectronics LSM9DS0 IMU

	  sensor. Supported devices: accelerometer/magnetometer of lsm9ds0.



	  To compile this driver as a module, choose M here: the module

	  will be called st_lsm9ds0.



config IIO_ST_LSM9DS0_I2C

	tristate

	depends on IIO_ST_LSM9DS0

	select REGMAP_I2C



config IIO_ST_LSM9DS0_SPI

	tristate

	depends on IIO_ST_LSM9DS0

	select REGMAP_SPI

drivers/iio/imu/st_lsm9ds0/Makefile

0 → 100644
+5 −0
Original line number Diff line number Diff line 
# SPDX-License-Identifier: GPL-2.0-only

obj-$(CONFIG_IIO_ST_LSM9DS0) += st_lsm9ds0.o

st_lsm9ds0-y := st_lsm9ds0_core.o

obj-$(CONFIG_IIO_ST_LSM9DS0_I2C) += st_lsm9ds0_i2c.o

obj-$(CONFIG_IIO_ST_LSM9DS0_SPI) += st_lsm9ds0_spi.o