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Commit 244a93f6 authored by Martin Kepplinger's avatar Martin Kepplinger Committed by Jonathan Cameron
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iio: mma8452: add support for MMA8451Q 

This adds support for this series' 14 bit accelerometer chip, MMA8451Q.
It's datasheet is available at the vendor's website:

https://cache.freescale.com/files/sensors/doc/data_sheet/MMA8451Q.pdf



Signed-off-by: default avatarMartin Kepplinger <martin.kepplinger@theobroma-systems.com>
Signed-off-by: default avatarChristoph Muellner <christoph.muellner@theobroma-systems.com>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent 36775d57

Documentation/devicetree/bindings/iio/accel/mma8452.txt

+3 −1
Original line number Diff line number Diff line 
Freescale MMA8452Q, MMA8453Q, MMA8652FC or MMA8653FC triaxial accelerometer

Freescale MMA8451Q, MMA8452Q, MMA8453Q, MMA8652FC or MMA8653FC

triaxial accelerometer



Required properties:



  - compatible: should contain one of

    * "fsl,mma8451"

    * "fsl,mma8452"

    * "fsl,mma8453"

    * "fsl,mma8652"

drivers/iio/accel/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -143,7 +143,7 @@ config MMA8452 
	select IIO_TRIGGERED_BUFFER

	help

	  Say yes here to build support for the following Freescale 3-axis

	  accelerometers: MMA8452Q, MMA8453Q, MMA8652FC, MMA8653FC.

	  accelerometers: MMA8451Q, MMA8452Q, MMA8453Q, MMA8652FC, MMA8653FC.



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

	  will be called mma8452.

drivers/iio/accel/mma8452.c

+36 −6
Original line number Diff line number Diff line 
/*

 * mma8452.c - Support for following Freescale 3-axis accelerometers:

 *

 * MMA8451Q (14 bit)

 * MMA8452Q (12 bit)

 * MMA8453Q (10 bit)

 * MMA8652FC (12 bit)
@@ -85,6 +86,7 @@ 
#define  MMA8452_INT_FF_MT			BIT(2)

#define  MMA8452_INT_TRANS			BIT(5)



#define MMA8451_DEVICE_ID			0x1a

#define MMA8452_DEVICE_ID			0x2a

#define MMA8453_DEVICE_ID			0x3a

#define MMA8652_DEVICE_ID			0x4a
@@ -942,6 +944,14 @@ static struct attribute_group mma8452_event_attribute_group = { 
	.num_event_specs = ARRAY_SIZE(mma8452_motion_event), \

}



static const struct iio_chan_spec mma8451_channels[] = {

	MMA8452_CHANNEL(X, idx_x, 14),

	MMA8452_CHANNEL(Y, idx_y, 14),

	MMA8452_CHANNEL(Z, idx_z, 14),

	IIO_CHAN_SOFT_TIMESTAMP(idx_ts),

	MMA8452_FREEFALL_CHANNEL(IIO_MOD_X_AND_Y_AND_Z),

};



static const struct iio_chan_spec mma8452_channels[] = {

	MMA8452_CHANNEL(X, idx_x, 12),

	MMA8452_CHANNEL(Y, idx_y, 12),
@@ -975,6 +985,7 @@ static const struct iio_chan_spec mma8653_channels[] = { 
};



enum {

	mma8451,

	mma8452,

	mma8453,

	mma8652,
@@ -982,17 +993,34 @@ enum { 
};



static const struct mma_chip_info mma_chip_info_table[] = {

	[mma8452] = {

		.chip_id = MMA8452_DEVICE_ID,

		.channels = mma8452_channels,

		.num_channels = ARRAY_SIZE(mma8452_channels),

	[mma8451] = {

		.chip_id = MMA8451_DEVICE_ID,

		.channels = mma8451_channels,

		.num_channels = ARRAY_SIZE(mma8451_channels),

		/*

		 * Hardware has fullscale of -2G, -4G, -8G corresponding to

		 * raw value -2048 for 12 bit or -512 for 10 bit.

		 * raw value -8192 for 14 bit, -2048 for 12 bit or -512 for 10

		 * bit.

		 * The userspace interface uses m/s^2 and we declare micro units

		 * So scale factor for 12 bit here is given by:

		 * 	g * N * 1000000 / 2048 for N = 2, 4, 8 and g=9.80665

		 */

		.mma_scales = { {0, 2394}, {0, 4788}, {0, 9577} },

		.ev_cfg = MMA8452_TRANSIENT_CFG,

		.ev_cfg_ele = MMA8452_TRANSIENT_CFG_ELE,

		.ev_cfg_chan_shift = 1,

		.ev_src = MMA8452_TRANSIENT_SRC,

		.ev_src_xe = MMA8452_TRANSIENT_SRC_XTRANSE,

		.ev_src_ye = MMA8452_TRANSIENT_SRC_YTRANSE,

		.ev_src_ze = MMA8452_TRANSIENT_SRC_ZTRANSE,

		.ev_ths = MMA8452_TRANSIENT_THS,

		.ev_ths_mask = MMA8452_TRANSIENT_THS_MASK,

		.ev_count = MMA8452_TRANSIENT_COUNT,

	},

	[mma8452] = {

		.chip_id = MMA8452_DEVICE_ID,

		.channels = mma8452_channels,

		.num_channels = ARRAY_SIZE(mma8452_channels),

		.mma_scales = { {0, 9577}, {0, 19154}, {0, 38307} },

		.ev_cfg = MMA8452_TRANSIENT_CFG,

		.ev_cfg_ele = MMA8452_TRANSIENT_CFG_ELE,
@@ -1173,6 +1201,7 @@ static int mma8452_reset(struct i2c_client *client) 
}



static const struct of_device_id mma8452_dt_ids[] = {

	{ .compatible = "fsl,mma8451", .data = &mma_chip_info_table[mma8451] },

	{ .compatible = "fsl,mma8452", .data = &mma_chip_info_table[mma8452] },

	{ .compatible = "fsl,mma8453", .data = &mma_chip_info_table[mma8453] },

	{ .compatible = "fsl,mma8652", .data = &mma_chip_info_table[mma8652] },
@@ -1209,6 +1238,7 @@ static int mma8452_probe(struct i2c_client *client, 
		return ret;



	switch (ret) {

	case MMA8451_DEVICE_ID:

	case MMA8452_DEVICE_ID:

	case MMA8453_DEVICE_ID:

	case MMA8652_DEVICE_ID: