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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
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+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"
+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.
+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: