Commit c5ea1b58 authored by Martin Kepplinger's avatar Martin Kepplinger Committed by Jonathan Cameron
Browse files

iio: mma8452: add support for MMA8453Q accelerometer chip 

This adds support for the 10 bit version if Freescale's accelerometers
of this series. The datasheet is available at Freescale's website:

http://cache.freescale.com/files/sensors/doc/data_sheet/MMA8453Q.pdf



It creates a devicetree bindings file to document the new functionality
and removes the driver from the trivial-devices list.

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 c3cdd6e4

Documentation/devicetree/bindings/i2c/trivial-devices.txt

+0 −1
Original line number Diff line number Diff line
@@ -54,7 +54,6 @@ epson,rx8581 I2C-BUS INTERFACE REAL TIME CLOCK MODULE 
fsl,mag3110		MAG3110: Xtrinsic High Accuracy, 3D Magnetometer

fsl,mc13892		MC13892: Power Management Integrated Circuit (PMIC) for i.MX35/51

fsl,mma8450		MMA8450Q: Xtrinsic Low-power, 3-axis Xtrinsic Accelerometer

fsl,mma8452		MMA8452Q: 3-axis 12-bit / 8-bit Digital Accelerometer

fsl,mpr121		MPR121: Proximity Capacitive Touch Sensor Controller

fsl,sgtl5000		SGTL5000: Ultra Low-Power Audio Codec

gmt,g751		G751: Digital Temperature Sensor and Thermal Watchdog with Two-Wire Interface

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

0 → 100644
+22 −0
Original line number Diff line number Diff line 
Freescale MMA8452Q or MMA8453Q triaxial accelerometer



Required properties:



  - compatible: should contain one of

    * "fsl,mma8452"

    * "fsl,mma8453"

  - reg: the I2C address of the chip



Optional properties:



  - interrupt-parent: should be the phandle for the interrupt controller

  - interrupts: interrupt mapping for GPIO IRQ



Example:



	mma8453fc@1d {

		compatible = "fsl,mma8453";

		reg = <0x1d>;

		interrupt-parent = <&gpio1>;

		interrupts = <5 0>;

	};

drivers/iio/accel/Kconfig

+3 −3
Original line number Diff line number Diff line
@@ -100,13 +100,13 @@ config KXCJK1013 
	  be called kxcjk-1013.



config MMA8452

	tristate "Freescale MMA8452Q Accelerometer Driver"

	tristate "Freescale MMA8452Q and similar Accelerometers Driver"

	depends on I2C

	select IIO_BUFFER

	select IIO_TRIGGERED_BUFFER

	help

	  Say yes here to build support for the Freescale MMA8452Q 3-axis

	  accelerometer.

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

	  accelerometers: MMA8452Q, MMA8453Q.



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

	  will be called mma8452.

drivers/iio/accel/mma8452.c

+34 −3
Original line number Diff line number Diff line 
/*

 * mma8452.c - Support for Freescale MMA8452Q 3-axis 12-bit accelerometer

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

 *

 * MMA8452Q (12 bit)

 * MMA8453Q (10 bit)

 *

 * Copyright 2014 Peter Meerwald <pmeerw@pmeerw.net>

 *
@@ -26,7 +29,7 @@ 


#define MMA8452_STATUS				0x00

#define  MMA8452_STATUS_DRDY			(BIT(2) | BIT(1) | BIT(0))

#define MMA8452_OUT_X				0x01 /* MSB first, 12-bit  */

#define MMA8452_OUT_X				0x01 /* MSB first */

#define MMA8452_OUT_Y				0x03

#define MMA8452_OUT_Z				0x05

#define MMA8452_INT_SRC				0x0c
@@ -69,6 +72,7 @@ 
#define  MMA8452_INT_TRANS			BIT(5)



#define  MMA8452_DEVICE_ID			0x2a

#define  MMA8453_DEVICE_ID			0x3a



struct mma8452_data {

	struct i2c_client *client;
@@ -768,8 +772,16 @@ static const struct iio_chan_spec mma8452_channels[] = { 
	IIO_CHAN_SOFT_TIMESTAMP(3),

};



static const struct iio_chan_spec mma8453_channels[] = {

	MMA8452_CHANNEL(X, 0, 10),

	MMA8452_CHANNEL(Y, 1, 10),

	MMA8452_CHANNEL(Z, 2, 10),

	IIO_CHAN_SOFT_TIMESTAMP(3),

};



enum {

	mma8452,

	mma8453,

};



static const struct mma_chip_info mma_chip_info_table[] = {
@@ -796,6 +808,22 @@ static const struct mma_chip_info mma_chip_info_table[] = { 
		.ev_ths_mask = MMA8452_TRANSIENT_THS_MASK,

		.ev_count = MMA8452_TRANSIENT_COUNT,

	},

	[mma8453] = {

		.chip_id = MMA8453_DEVICE_ID,

		.channels = mma8453_channels,

		.num_channels = ARRAY_SIZE(mma8453_channels),

		.mma_scales = { {0, 38307}, {0, 76614}, {0, 153228} },

		.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,

	},

};



static struct attribute *mma8452_attributes[] = {
@@ -917,6 +945,7 @@ static int mma8452_reset(struct i2c_client *client) 


static const struct of_device_id mma8452_dt_ids[] = {

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

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

	{ }

};

MODULE_DEVICE_TABLE(of, mma8452_dt_ids);
@@ -932,7 +961,8 @@ static int mma8452_probe(struct i2c_client *client, 
	ret = i2c_smbus_read_byte_data(client, MMA8452_WHO_AM_I);

	if (ret < 0)

		return ret;

	if (ret != MMA8452_DEVICE_ID)



	if (ret != MMA8452_DEVICE_ID && ret != MMA8453_DEVICE_ID)

		return -ENODEV;



	match = of_match_device(mma8452_dt_ids, &client->dev);
@@ -1079,6 +1109,7 @@ static SIMPLE_DEV_PM_OPS(mma8452_pm_ops, mma8452_suspend, mma8452_resume); 


static const struct i2c_device_id mma8452_id[] = {

	{ "mma8452", mma8452 },

	{ "mma8453", mma8453 },

	{ }

};

MODULE_DEVICE_TABLE(i2c, mma8452_id);

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