Re: [PATCH] iio: st-sensors: add support for lis3lv02d accelerometer

[Jonathan Cameron <jic23-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>]

On 23/08/14 18:31, Linus Walleij wrote:
> This adds support for the LIS3LV02 accelerometer found in the
> ST Microelectronics Nomadik board series.
> 
> Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
> Cc: Denis CIOCCA <denis.ciocca-qxv4g6HH51o@public.gmane.org>
> Cc: Lee Jones <lee.jones-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
> Signed-off-by: Linus Walleij <linus.walleij-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
This is a little 'interesting', given the part is already supported by
drivers/misc/lis3lv02d*.c and already has bindings under there.
Documentation/devicetree/bindings/misc/lis302.txt
(some of these are interesting).

Do we think this is the right way to handle the alternative support
here?

Denis, if you have time, could you take a look at this addition to your
driver.

If anyone wants to look at what the misc driver supports that we still
don't have in the IIO driver then that would be great!

Jonathan

> ---
>  .../devicetree/bindings/iio/st-sensors.txt         |  1 +
>  drivers/iio/accel/st_accel.h                       |  1 +
>  drivers/iio/accel/st_accel_core.c                  | 81 ++++++++++++++++++++++
>  drivers/iio/accel/st_accel_i2c.c                   |  4 ++
>  4 files changed, 87 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/iio/st-sensors.txt b/Documentation/devicetree/bindings/iio/st-sensors.txt
> index a7a0a15913ad..d2aaca974531 100644
> --- a/Documentation/devicetree/bindings/iio/st-sensors.txt
> +++ b/Documentation/devicetree/bindings/iio/st-sensors.txt
> @@ -23,6 +23,7 @@ standard bindings from pinctrl/pinctrl-bindings.txt.
>  Valid compatible strings:
>  
>  Accelerometers:
> +- st,lis3lv02dl-accel
>  - st,lsm303dlh-accel
>  - st,lsm303dlhc-accel
>  - st,lis3dh-accel
> diff --git a/drivers/iio/accel/st_accel.h b/drivers/iio/accel/st_accel.h
> index c3877630b2e4..38a0e9932549 100644
> --- a/drivers/iio/accel/st_accel.h
> +++ b/drivers/iio/accel/st_accel.h
> @@ -14,6 +14,7 @@
>  #include <linux/types.h>
>  #include <linux/iio/common/st_sensors.h>
>  
> +#define LIS3LV02DL_ACCEL_DEV_NAME	"lis3lv02dl_accel"
>  #define LSM303DLHC_ACCEL_DEV_NAME	"lsm303dlhc_accel"
>  #define LIS3DH_ACCEL_DEV_NAME		"lis3dh"
>  #define LSM330D_ACCEL_DEV_NAME		"lsm330d_accel"
> diff --git a/drivers/iio/accel/st_accel_core.c b/drivers/iio/accel/st_accel_core.c
> index 087864854c61..d4dd05d0b24d 100644
> --- a/drivers/iio/accel/st_accel_core.c
> +++ b/drivers/iio/accel/st_accel_core.c
> @@ -129,6 +129,30 @@
>  #define ST_ACCEL_3_IG1_EN_MASK			0x08
>  #define ST_ACCEL_3_MULTIREAD_BIT		false
>  
> +/* CUSTOM VALUES FOR SENSOR 4 */
I wish now we'd nipped this naming convention in the bud and insisted
on naming after a relevant part. Oh well.

> +#define ST_ACCEL_4_WAI_EXP			0x3a
> +#define ST_ACCEL_4_ODR_ADDR			0x20
> +#define ST_ACCEL_4_ODR_MASK			0x30 /* DF1 and DF0 */
> +#define ST_ACCEL_4_ODR_AVL_40HZ_VAL		0x00
> +#define ST_ACCEL_4_ODR_AVL_160HZ_VAL		0x01
> +#define ST_ACCEL_4_ODR_AVL_640HZ_VAL		0x02
> +#define ST_ACCEL_4_ODR_AVL_2560HZ_VAL		0x03
> +#define ST_ACCEL_4_PW_ADDR			0x20
> +#define ST_ACCEL_4_PW_MASK			0xc0
> +#define ST_ACCEL_4_FS_ADDR			0x21
> +#define ST_ACCEL_4_FS_MASK			0x80
> +#define ST_ACCEL_4_FS_AVL_2_VAL			0X00
> +#define ST_ACCEL_4_FS_AVL_6_VAL			0X01
> +#define ST_ACCEL_4_FS_AVL_2_GAIN		IIO_G_TO_M_S_2(1024)
> +#define ST_ACCEL_4_FS_AVL_6_GAIN		IIO_G_TO_M_S_2(340)
> +#define ST_ACCEL_4_BDU_ADDR			0x21
> +#define ST_ACCEL_4_BDU_MASK			0x40
> +#define ST_ACCEL_4_DRDY_IRQ_ADDR		0x21
> +#define ST_ACCEL_4_DRDY_IRQ_INT1_MASK		0x04
> +#define ST_ACCEL_4_IG1_EN_ADDR			0x21
> +#define ST_ACCEL_4_IG1_EN_MASK			0x08
> +#define ST_ACCEL_4_MULTIREAD_BIT		true
> +
>  static const struct iio_chan_spec st_accel_12bit_channels[] = {
>  	ST_SENSORS_LSM_CHANNELS(IIO_ACCEL,
>  			BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
> @@ -373,6 +397,63 @@ static const struct st_sensors st_accel_sensors[] = {
>  		.multi_read_bit = ST_ACCEL_3_MULTIREAD_BIT,
>  		.bootime = 2,
>  	},
> +	{
> +		.wai = ST_ACCEL_4_WAI_EXP,
> +		.sensors_supported = {
> +			[0] = LIS3LV02DL_ACCEL_DEV_NAME,
> +		},
> +		.ch = (struct iio_chan_spec *)st_accel_12bit_channels,
> +		.odr = {
> +			.addr = ST_ACCEL_4_ODR_ADDR,
> +			.mask = ST_ACCEL_4_ODR_MASK,
> +			.odr_avl = {
> +				{ 40, ST_ACCEL_4_ODR_AVL_40HZ_VAL },
> +				{ 160, ST_ACCEL_4_ODR_AVL_160HZ_VAL, },
> +				{ 640, ST_ACCEL_4_ODR_AVL_640HZ_VAL, },
> +				{ 2560, ST_ACCEL_4_ODR_AVL_2560HZ_VAL, },
> +			},
> +		},
> +		.pw = {
> +			.addr = ST_ACCEL_4_PW_ADDR,
> +			.mask = ST_ACCEL_4_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_ACCEL_4_FS_ADDR,
> +			.mask = ST_ACCEL_4_FS_MASK,
> +			.fs_avl = {
> +				[0] = {
> +					.num = ST_ACCEL_FS_AVL_2G,
> +					.value = ST_ACCEL_4_FS_AVL_2_VAL,
> +					.gain = ST_ACCEL_4_FS_AVL_2_GAIN,
> +				},
> +				[1] = {
> +					.num = ST_ACCEL_FS_AVL_6G,
> +					.value = ST_ACCEL_4_FS_AVL_6_VAL,
> +					.gain = ST_ACCEL_4_FS_AVL_6_GAIN,
> +				},
> +			},
> +		},
> +		.bdu = {
> +			.addr = ST_ACCEL_4_BDU_ADDR,
> +			.mask = ST_ACCEL_4_BDU_MASK,
> +		},
> +		.drdy_irq = {
> +			.addr = ST_ACCEL_4_DRDY_IRQ_ADDR,
> +			.mask_int1 = ST_ACCEL_4_DRDY_IRQ_INT1_MASK,
> +			.ig1 = {
> +				.en_addr = ST_ACCEL_4_IG1_EN_ADDR,
> +				.en_mask = ST_ACCEL_4_IG1_EN_MASK,
> +			},
> +		},
> +		.multi_read_bit = ST_ACCEL_4_MULTIREAD_BIT,
> +		.bootime = 2, /* guess */
> +	},
>  };
>  
>  static int st_accel_read_raw(struct iio_dev *indio_dev,
> diff --git a/drivers/iio/accel/st_accel_i2c.c b/drivers/iio/accel/st_accel_i2c.c
> index 7164aeff3ab1..146ebce50509 100644
> --- a/drivers/iio/accel/st_accel_i2c.c
> +++ b/drivers/iio/accel/st_accel_i2c.c
> @@ -21,6 +21,10 @@
>  #ifdef CONFIG_OF
>  static const struct of_device_id st_accel_of_match[] = {
>  	{
> +		.compatible = "st,lis3lv02dl-accel",
This one is going to be interesting... There are existing
bindings fo rhte same part in drivers/misc/lis3lv02d_i2c.c


> +		.data = LIS3LV02DL_ACCEL_DEV_NAME,
> +	},
> +	{
>  		.compatible = "st,lsm303dlh-accel",
>  		.data = LSM303DLH_ACCEL_DEV_NAME,
>  	},
>