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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: Martin Kepplinger <martin.kepplinger@theobroma-systems.com>
Signed-off-by: Christoph Muellner <christoph.muellner@theobroma-systems.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Martin Kepplinger 2016-01-16 15:35:22 +01:00 committed by Jonathan Cameron
parent 36775d5701
commit 244a93f651
3 changed files with 41 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
Documentation/devicetree/bindings/iio/accel/mma8452.txt
View File

@ -1,8 +1,10 @@
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"

2
drivers/iio/accel/Kconfig
View File

@ -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.

44
drivers/iio/accel/mma8452.c
View File

@ -1,6 +1,7 @@
/*
* 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[] = {
[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 -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),
/*
* Hardware has fullscale of -2G, -4G, -8G corresponding to
* raw value -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, 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: