iio: add driver for Freescale MMA9551L

Add support for Freescale MMA9551L Intelligent Motion-Sensing Platform.
The driver supports raw reads for acceleration and inclination, as well
as configuring inclination rate-of-change events.  The events can be
used similarly to an Android sensor Tilt event.

The specifications can be downloaded from:
http://www.freescale.com/files/sensors/doc/ref_manual/MMA955xLSWRM.pdf

Signed-off-by: Irina Tirdea <irina.tirdea@intel.com>
Signed-off-by: Vlad Dogaru <vlad.dogaru@intel.com>
Reviewed-by: Hartmut Knaack <knaack.h@gmx.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

3 files changed, 965 insertions, 0 deletions

diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig
index 9b9be8725e9d..d80616d77034 100644
--- a/drivers/iio/accel/Kconfig
+++ b/drivers/iio/accel/Kconfig
@@ -105,4 +105,14 @@ config KXCJK1013
 	  To compile this driver as a module, choose M here: the module will
 	  be called kxcjk-1013.
 
+config MMA9551
+	tristate "Freescale MMA9551L Intelligent Motion-Sensing Platform Driver"
+	depends on I2C
+	help
+	  Say yes here to build support for the Freescale MMA9551L
+	  Intelligent Motion-Sensing Platform Driver.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called mma9551.
+
 endmenu
diff --git a/drivers/iio/accel/Makefile b/drivers/iio/accel/Makefile
index a593996c6539..de5b9cb9670f 100644
--- a/drivers/iio/accel/Makefile
+++ b/drivers/iio/accel/Makefile
@@ -9,6 +9,7 @@ obj-$(CONFIG_HID_SENSOR_ACCEL_3D) += hid-sensor-accel-3d.o
 obj-$(CONFIG_KXCJK1013) += kxcjk-1013.o
 obj-$(CONFIG_KXSD9)	+= kxsd9.o
 obj-$(CONFIG_MMA8452)	+= mma8452.o
+obj-$(CONFIG_MMA9551)	+= mma9551.o
 
 obj-$(CONFIG_IIO_ST_ACCEL_3AXIS) += st_accel.o
 st_accel-y := st_accel_core.o
diff --git a/drivers/iio/accel/mma9551.c b/drivers/iio/accel/mma9551.c
new file mode 100644
index 000000000000..1be125bb9161
--- /dev/null
+++ b/drivers/iio/accel/mma9551.c
@@ -0,0 +1,954 @@
+/*
+ * Freescale MMA9551L Intelligent Motion-Sensing Platform driver
+ * Copyright (c) 2014, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/acpi.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/events.h>
+
+#define MMA9551_DRV_NAME		"mma9551"
+#define MMA9551_IRQ_NAME		"mma9551_event"
+#define MMA9551_GPIO_NAME		"mma9551_int"
+#define MMA9551_GPIO_COUNT		4
+
+/* Applications IDs */
+#define MMA9551_APPID_VERSION		0x00
+#define MMA9551_APPID_GPIO		0x03
+#define MMA9551_APPID_AFE		0x06
+#define MMA9551_APPID_TILT		0x0B
+#define MMA9551_APPID_SLEEP_WAKE	0x12
+#define MMA9551_APPID_RESET		0x17
+#define MMA9551_APPID_NONE		0xff
+
+/* Command masks for mailbox write command */
+#define MMA9551_CMD_READ_VERSION_INFO	0x00
+#define MMA9551_CMD_READ_CONFIG		0x10
+#define MMA9551_CMD_WRITE_CONFIG	0x20
+#define MMA9551_CMD_READ_STATUS		0x30
+
+enum mma9551_gpio_pin {
+	mma9551_gpio6 = 0,
+	mma9551_gpio7,
+	mma9551_gpio8,
+	mma9551_gpio9,
+	mma9551_gpio_max = mma9551_gpio9,
+};
+
+/* Mailbox read command */
+#define MMA9551_RESPONSE_COCO		BIT(7)
+
+/* Error-Status codes returned in mailbox read command */
+#define MMA9551_MCI_ERROR_NONE			0x00
+#define MMA9551_MCI_ERROR_PARAM			0x04
+#define MMA9551_MCI_INVALID_COUNT		0x19
+#define MMA9551_MCI_ERROR_COMMAND		0x1C
+#define MMA9551_MCI_ERROR_INVALID_LENGTH	0x21
+#define MMA9551_MCI_ERROR_FIFO_BUSY		0x22
+#define MMA9551_MCI_ERROR_FIFO_ALLOCATED	0x23
+#define MMA9551_MCI_ERROR_FIFO_OVERSIZE		0x24
+
+/* GPIO Application */
+#define MMA9551_GPIO_POL_MSB		0x08
+#define MMA9551_GPIO_POL_LSB		0x09
+
+/* Sleep/Wake application */
+#define MMA9551_SLEEP_CFG		0x06
+#define MMA9551_SLEEP_CFG_SNCEN		BIT(0)
+#define MMA9551_SLEEP_CFG_SCHEN		BIT(2)
+
+/* AFE application */
+#define MMA9551_AFE_X_ACCEL_REG		0x00
+#define MMA9551_AFE_Y_ACCEL_REG		0x02
+#define MMA9551_AFE_Z_ACCEL_REG		0x04
+
+/* Tilt application (inclination in IIO terms). */
+#define MMA9551_TILT_XZ_ANG_REG		0x00
+#define MMA9551_TILT_YZ_ANG_REG		0x01
+#define MMA9551_TILT_XY_ANG_REG		0x02
+#define MMA9551_TILT_ANGFLG		BIT(7)
+#define MMA9551_TILT_QUAD_REG		0x03
+#define MMA9551_TILT_XY_QUAD_SHIFT	0
+#define MMA9551_TILT_YZ_QUAD_SHIFT	2
+#define MMA9551_TILT_XZ_QUAD_SHIFT	4
+#define MMA9551_TILT_CFG_REG		0x01
+#define MMA9551_TILT_ANG_THRESH_MASK	GENMASK(3, 0)
+
+/* Tilt events are mapped to the first three GPIO pins. */
+enum mma9551_tilt_axis {
+	mma9551_x = 0,
+	mma9551_y,
+	mma9551_z,
+};
+
+/*
+ * A response is composed of:
+ * - control registers: MB0-3
+ * - data registers: MB4-31
+ *
+ * A request is composed of:
+ * - mbox to write to (always 0)
+ * - control registers: MB1-4
+ * - data registers: MB5-31
+ */
+#define MMA9551_MAILBOX_CTRL_REGS	4
+#define MMA9551_MAX_MAILBOX_DATA_REGS	28
+#define MMA9551_MAILBOX_REGS		32
+
+#define MMA9551_I2C_READ_RETRIES	5
+#define MMA9551_I2C_READ_DELAY	50	/* us */
+
+struct mma9551_mbox_request {
+	u8 start_mbox;		/* Always 0. */
+	u8 app_id;
+	/*
+	 * See Section 5.3.1 of the MMA955xL Software Reference Manual.
+	 *
+	 * Bit 7: reserved, always 0
+	 * Bits 6-4: command
+	 * Bits 3-0: upper bits of register offset
+	 */
+	u8 cmd_off;
+	u8 lower_off;
+	u8 nbytes;
+	u8 buf[MMA9551_MAX_MAILBOX_DATA_REGS - 1];
+} __packed;
+
+struct mma9551_mbox_response {
+	u8 app_id;
+	/*
+	 * See Section 5.3.3 of the MMA955xL Software Reference Manual.
+	 *
+	 * Bit 7: COCO
+	 * Bits 6-0: Error code.
+	 */
+	u8 coco_err;
+	u8 nbytes;
+	u8 req_bytes;
+	u8 buf[MMA9551_MAX_MAILBOX_DATA_REGS];
+} __packed;
+
+struct mma9551_version_info {
+	__be32 device_id;
+	u8 rom_version[2];
+	u8 fw_version[2];
+	u8 hw_version[2];
+	u8 fw_build[2];
+};
+
+struct mma9551_data {
+	struct i2c_client *client;
+	struct mutex mutex;
+	int event_enabled[3];
+	int irqs[MMA9551_GPIO_COUNT];
+};
+
+static int mma9551_transfer(struct i2c_client *client,
+			    u8 app_id, u8 command, u16 offset,
+			    u8 *inbytes, int num_inbytes,
+			    u8 *outbytes, int num_outbytes)
+{
+	struct mma9551_mbox_request req;
+	struct mma9551_mbox_response rsp;
+	struct i2c_msg in, out;
+	u8 req_len, err_code;
+	int ret, retries;
+
+	if (offset >= 1 << 12) {
+		dev_err(&client->dev, "register offset too large\n");
+		return -EINVAL;
+	}
+
+	req_len = 1 + MMA9551_MAILBOX_CTRL_REGS + num_inbytes;
+	req.start_mbox = 0;
+	req.app_id = app_id;
+	req.cmd_off = command | (offset >> 8);
+	req.lower_off = offset;
+
+	if (command == MMA9551_CMD_WRITE_CONFIG)
+		req.nbytes = num_inbytes;
+	else
+		req.nbytes = num_outbytes;
+	if (num_inbytes)
+		memcpy(req.buf, inbytes, num_inbytes);
+
+	out.addr = client->addr;
+	out.flags = 0;
+	out.len = req_len;
+	out.buf = (u8 *)&req;
+
+	ret = i2c_transfer(client->adapter, &out, 1);
+	if (ret < 0) {
+		dev_err(&client->dev, "i2c write failed\n");
+		return ret;
+	}
+
+	retries = MMA9551_I2C_READ_RETRIES;
+	do {
+		udelay(MMA9551_I2C_READ_DELAY);
+
+		in.addr = client->addr;
+		in.flags = I2C_M_RD;
+		in.len = sizeof(rsp);
+		in.buf = (u8 *)&rsp;
+
+		ret = i2c_transfer(client->adapter, &in, 1);
+		if (ret < 0) {
+			dev_err(&client->dev, "i2c read failed\n");
+			return ret;
+		}
+
+		if (rsp.coco_err & MMA9551_RESPONSE_COCO)
+			break;
+	} while (--retries > 0);
+
+	if (retries == 0) {
+		dev_err(&client->dev,
+			"timed out while waiting for command response\n");
+		return -ETIMEDOUT;
+	}
+
+	if (rsp.app_id != app_id) {
+		dev_err(&client->dev,
+			"app_id mismatch in response got %02x expected %02x\n",
+			rsp.app_id, app_id);
+		return -EINVAL;
+	}
+
+	err_code = rsp.coco_err & ~MMA9551_RESPONSE_COCO;
+	if (err_code != MMA9551_MCI_ERROR_NONE) {
+		dev_err(&client->dev, "read returned error %x\n", err_code);
+		return -EINVAL;
+	}
+
+	if (rsp.nbytes != rsp.req_bytes) {
+		dev_err(&client->dev,
+			"output length mismatch got %d expected %d\n",
+			rsp.nbytes, rsp.req_bytes);
+		return -EINVAL;
+	}
+
+	if (num_outbytes)
+		memcpy(outbytes, rsp.buf, num_outbytes);
+
+	return 0;
+}
+
+static int mma9551_read_config_byte(struct i2c_client *client, u8 app_id,
+				    u16 reg, u8 *val)
+{
+	return mma9551_transfer(client, app_id, MMA9551_CMD_READ_CONFIG,
+				reg, NULL, 0, val, 1);
+}
+
+static int mma9551_write_config_byte(struct i2c_client *client, u8 app_id,
+				     u16 reg, u8 val)
+{
+	return mma9551_transfer(client, app_id, MMA9551_CMD_WRITE_CONFIG, reg,
+				&val, 1, NULL, 0);
+}
+
+static int mma9551_read_status_byte(struct i2c_client *client, u8 app_id,
+				    u16 reg, u8 *val)
+{
+	return mma9551_transfer(client, app_id, MMA9551_CMD_READ_STATUS,
+				reg, NULL, 0, val, 1);
+}
+
+static int mma9551_read_status_word(struct i2c_client *client, u8 app_id,
+				    u16 reg, u16 *val)
+{
+	int ret;
+	__be16 v;
+
+	ret = mma9551_transfer(client, app_id, MMA9551_CMD_READ_STATUS,
+			       reg, NULL, 0, (u8 *)&v, 2);
+	*val = be16_to_cpu(v);
+
+	return ret;
+}
+
+static int mma9551_update_config_bits(struct i2c_client *client, u8 app_id,
+				      u16 reg, u8 mask, u8 val)
+{
+	int ret;
+	u8 tmp, orig;
+
+	ret = mma9551_read_config_byte(client, app_id, reg, &orig);
+	if (ret < 0)
+		return ret;
+
+	tmp = orig & ~mask;
+	tmp |= val & mask;
+
+	if (tmp == orig)
+		return 0;
+
+	return mma9551_write_config_byte(client, app_id, reg, tmp);
+}
+
+/*
+ * The polarity parameter is described in section 6.2.2, page 66, of the
+ * Software Reference Manual.  Basically, polarity=0 means the interrupt
+ * line has the same value as the selected bit, while polarity=1 means
+ * the line is inverted.
+ */
+static int mma9551_gpio_config(struct i2c_client *client,
+			       enum mma9551_gpio_pin pin,
+			       u8 app_id, u8 bitnum, int polarity)
+{
+	u8 reg, pol_mask, pol_val;
+	int ret;
+
+	if (pin > mma9551_gpio_max) {
+		dev_err(&client->dev, "bad GPIO pin\n");
+		return -EINVAL;
+	}
+
+	/*
+	 * Pin 6 is configured by regs 0x00 and 0x01, pin 7 by 0x02 and
+	 * 0x03, and so on.
+	 */
+	reg = pin * 2;
+
+	ret = mma9551_write_config_byte(client, MMA9551_APPID_GPIO,
+					reg, app_id);
+	if (ret < 0) {
+		dev_err(&client->dev, "error setting GPIO app_id\n");
+		return ret;
+	}
+
+	ret = mma9551_write_config_byte(client, MMA9551_APPID_GPIO,
+					reg + 1, bitnum);
+	if (ret < 0) {
+		dev_err(&client->dev, "error setting GPIO bit number\n");
+		return ret;
+	}
+
+	switch (pin) {
+	case mma9551_gpio6:
+		reg = MMA9551_GPIO_POL_LSB;
+		pol_mask = 1 << 6;
+		break;
+	case mma9551_gpio7:
+		reg = MMA9551_GPIO_POL_LSB;
+		pol_mask = 1 << 7;
+		break;
+	case mma9551_gpio8:
+		reg = MMA9551_GPIO_POL_MSB;
+		pol_mask = 1 << 0;
+		break;
+	case mma9551_gpio9:
+		reg = MMA9551_GPIO_POL_MSB;
+		pol_mask = 1 << 1;
+		break;
+	}
+	pol_val = polarity ? pol_mask : 0;
+
+	ret = mma9551_update_config_bits(client, MMA9551_APPID_GPIO, reg,
+					 pol_mask, pol_val);
+	if (ret < 0)
+		dev_err(&client->dev, "error setting GPIO polarity\n");
+
+	return ret;
+}
+
+static int mma9551_read_version(struct i2c_client *client)
+{
+	struct mma9551_version_info info;
+	int ret;
+
+	ret = mma9551_transfer(client, MMA9551_APPID_VERSION, 0x00, 0x00,
+			       NULL, 0, (u8 *)&info, sizeof(info));
+	if (ret < 0)
+		return ret;
+
+	dev_info(&client->dev, "Device ID 0x%x, firmware version %02x.%02x\n",
+		 be32_to_cpu(info.device_id), info.fw_version[0],
+		 info.fw_version[1]);
+
+	return 0;
+}
+
+/*
+ * Use 'false' as the second parameter to cause the device to enter
+ * sleep.
+ */
+static int mma9551_set_device_state(struct i2c_client *client,
+				    bool enable)
+{
+	return mma9551_update_config_bits(client, MMA9551_APPID_SLEEP_WAKE,
+					  MMA9551_SLEEP_CFG,
+					  MMA9551_SLEEP_CFG_SNCEN,
+					  enable ? 0 : MMA9551_SLEEP_CFG_SNCEN);
+}
+
+static int mma9551_read_incli_chan(struct i2c_client *client,
+				   const struct iio_chan_spec *chan,
+				   int *val)
+{
+	u8 quad_shift, angle, quadrant;
+	u16 reg_addr;
+	int ret;
+
+	switch (chan->channel2) {
+	case IIO_MOD_X:
+		reg_addr = MMA9551_TILT_YZ_ANG_REG;
+		quad_shift = MMA9551_TILT_YZ_QUAD_SHIFT;
+		break;
+	case IIO_MOD_Y:
+		reg_addr = MMA9551_TILT_XZ_ANG_REG;
+		quad_shift = MMA9551_TILT_XZ_QUAD_SHIFT;
+		break;
+	case IIO_MOD_Z:
+		reg_addr = MMA9551_TILT_XY_ANG_REG;
+		quad_shift = MMA9551_TILT_XY_QUAD_SHIFT;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	ret = mma9551_read_status_byte(client, MMA9551_APPID_TILT,
+				       reg_addr, &angle);
+	if (ret < 0)
+		return ret;
+
+	ret = mma9551_read_status_byte(client, MMA9551_APPID_TILT,
+				       MMA9551_TILT_QUAD_REG, &quadrant);
+	if (ret < 0)
+		return ret;
+
+	angle &= ~MMA9551_TILT_ANGFLG;
+	quadrant = (quadrant >> quad_shift) & 0x03;
+
+	if (quadrant == 1 || quadrant == 3)
+		*val = 90 * (quadrant + 1) - angle;
+	else
+		*val = angle + 90 * quadrant;
+
+	return IIO_VAL_INT;
+}
+
+static int mma9551_read_accel_chan(struct i2c_client *client,
+				   const struct iio_chan_spec *chan,
+				   int *val, int *val2)
+{
+	u16 reg_addr;
+	s16 raw_accel;
+	int ret;
+
+	switch (chan->channel2) {
+	case IIO_MOD_X:
+		reg_addr = MMA9551_AFE_X_ACCEL_REG;
+		break;
+	case IIO_MOD_Y:
+		reg_addr = MMA9551_AFE_Y_ACCEL_REG;
+		break;
+	case IIO_MOD_Z:
+		reg_addr = MMA9551_AFE_Z_ACCEL_REG;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	ret = mma9551_read_status_word(client, MMA9551_APPID_AFE,
+				       reg_addr, &raw_accel);
+	if (ret < 0)
+		return ret;
+
+	*val = raw_accel;
+
+	return IIO_VAL_INT;
+}
+
+static int mma9551_read_raw(struct iio_dev *indio_dev,
+			    struct iio_chan_spec const *chan,
+			    int *val, int *val2, long mask)
+{
+	struct mma9551_data *data = iio_priv(indio_dev);
+	int ret;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_PROCESSED:
+		switch (chan->type) {
+		case IIO_INCLI:
+			mutex_lock(&data->mutex);
+			ret = mma9551_read_incli_chan(data->client, chan, val);
+			mutex_unlock(&data->mutex);
+			return ret;
+		default:
+			return -EINVAL;
+		}
+	case IIO_CHAN_INFO_RAW:
+		switch (chan->type) {
+		case IIO_ACCEL:
+			mutex_lock(&data->mutex);
+			ret = mma9551_read_accel_chan(data->client,
+						      chan, val, val2);
+			mutex_unlock(&data->mutex);
+			return ret;
+		default:
+			return -EINVAL;
+		}
+	case IIO_CHAN_INFO_SCALE:
+		switch (chan->type) {
+		case IIO_ACCEL:
+			*val = 0;
+			*val2 = 2440;
+			return IIO_VAL_INT_PLUS_MICRO;
+		default:
+			return -EINVAL;
+		}
+	default:
+		return -EINVAL;
+	}
+}
+
+static int mma9551_read_event_config(struct iio_dev *indio_dev,
+				     const struct iio_chan_spec *chan,
+				     enum iio_event_type type,
+				     enum iio_event_direction dir)
+{
+	struct mma9551_data *data = iio_priv(indio_dev);
+
+	switch (chan->type) {
+	case IIO_INCLI:
+		/* IIO counts axes from 1, because IIO_NO_MOD is 0. */
+		return data->event_enabled[chan->channel2 - 1];
+	default:
+		return -EINVAL;
+	}
+}
+
+static int mma9551_config_incli_event(struct iio_dev *indio_dev,
+				      enum iio_modifier axis,
+				      int state)
+{
+	struct mma9551_data *data = iio_priv(indio_dev);
+	enum mma9551_tilt_axis mma_axis;
+	int ret;
+
+	/* IIO counts axes from 1, because IIO_NO_MOD is 0. */
+	mma_axis = axis - 1;
+
+	if (data->event_enabled[mma_axis] == state)
+		return 0;
+
+	if (state == 0) {
+		ret = mma9551_gpio_config(data->client, mma_axis,
+					  MMA9551_APPID_NONE, 0, 0);
+		if (ret < 0)
+			return ret;
+	} else {
+		int bitnum;
+
+		/* Bit 7 of each angle register holds the angle flag. */
+		switch (axis) {
+		case IIO_MOD_X:
+			bitnum = 7 + 8 * MMA9551_TILT_YZ_ANG_REG;
+			break;
+		case IIO_MOD_Y:
+			bitnum = 7 + 8 * MMA9551_TILT_XZ_ANG_REG;
+			break;
+		case IIO_MOD_Z:
+			bitnum = 7 + 8 * MMA9551_TILT_XY_ANG_REG;
+			break;
+		default:
+			return -EINVAL;
+		}
+
+		ret = mma9551_gpio_config(data->client, mma_axis,
+					  MMA9551_APPID_TILT, bitnum, 0);
+		if (ret < 0)
+			return ret;
+	}
+
+	data->event_enabled[mma_axis] = state;
+
+	return ret;
+}
+
+static int mma9551_write_event_config(struct iio_dev *indio_dev,
+				      const struct iio_chan_spec *chan,
+				      enum iio_event_type type,
+				      enum iio_event_direction dir,
+				      int state)
+{
+	struct mma9551_data *data = iio_priv(indio_dev);
+	int ret;
+
+	switch (chan->type) {
+	case IIO_INCLI:
+		mutex_lock(&data->mutex);
+		ret = mma9551_config_incli_event(indio_dev,
+						 chan->channel2, state);
+		mutex_unlock(&data->mutex);
+		return ret;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int mma9551_write_event_value(struct iio_dev *indio_dev,
+				     const struct iio_chan_spec *chan,
+				     enum iio_event_type type,
+				     enum iio_event_direction dir,
+				     enum iio_event_info info,
+				     int val, int val2)
+{
+	struct mma9551_data *data = iio_priv(indio_dev);
+	int ret;
+
+	switch (chan->type) {
+	case IIO_INCLI:
+		if (val2 != 0 || val < 1 || val > 10)
+			return -EINVAL;
+		mutex_lock(&data->mutex);
+		ret = mma9551_update_config_bits(data->client,
+						 MMA9551_APPID_TILT,
+						 MMA9551_TILT_CFG_REG,
+						 MMA9551_TILT_ANG_THRESH_MASK,
+						 val);
+		mutex_unlock(&data->mutex);
+		return ret;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int mma9551_read_event_value(struct iio_dev *indio_dev,
+				    const struct iio_chan_spec *chan,
+				    enum iio_event_type type,
+				    enum iio_event_direction dir,
+				    enum iio_event_info info,
+				    int *val, int *val2)
+{
+	struct mma9551_data *data = iio_priv(indio_dev);
+	int ret;
+	u8 tmp;
+
+	switch (chan->type) {
+	case IIO_INCLI:
+		mutex_lock(&data->mutex);
+		ret = mma9551_read_config_byte(data->client,
+					       MMA9551_APPID_TILT,
+					       MMA9551_TILT_CFG_REG, &tmp);
+		mutex_unlock(&data->mutex);
+		if (ret < 0)
+			return ret;
+		*val = tmp & MMA9551_TILT_ANG_THRESH_MASK;
+		*val2 = 0;
+		return IIO_VAL_INT;
+	default:
+		return -EINVAL;
+	}
+}
+
+static const struct iio_event_spec mma9551_incli_event = {
+	.type = IIO_EV_TYPE_ROC,
+	.dir = IIO_EV_DIR_RISING,
+	.mask_separate = BIT(IIO_EV_INFO_ENABLE),
+	.mask_shared_by_type = BIT(IIO_EV_INFO_VALUE),
+};
+
+#define MMA9551_ACCEL_CHANNEL(axis) {				\
+	.type = IIO_ACCEL,					\
+	.modified = 1,						\
+	.channel2 = axis,					\
+	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),		\
+	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),	\
+}
+
+#define MMA9551_INCLI_CHANNEL(axis) {				\
+	.type = IIO_INCLI,					\
+	.modified = 1,						\
+	.channel2 = axis,					\
+	.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),	\
+	.event_spec = &mma9551_incli_event,			\
+	.num_event_specs = 1,					\
+}
+
+static const struct iio_chan_spec mma9551_channels[] = {
+	MMA9551_ACCEL_CHANNEL(IIO_MOD_X),
+	MMA9551_ACCEL_CHANNEL(IIO_MOD_Y),
+	MMA9551_ACCEL_CHANNEL(IIO_MOD_Z),
+
+	MMA9551_INCLI_CHANNEL(IIO_MOD_X),
+	MMA9551_INCLI_CHANNEL(IIO_MOD_Y),
+	MMA9551_INCLI_CHANNEL(IIO_MOD_Z),
+};
+
+static const struct iio_info mma9551_info = {
+	.driver_module = THIS_MODULE,
+	.read_raw = mma9551_read_raw,
+	.read_event_config = mma9551_read_event_config,
+	.write_event_config = mma9551_write_event_config,
+	.read_event_value = mma9551_read_event_value,
+	.write_event_value = mma9551_write_event_value,
+};
+
+static irqreturn_t mma9551_event_handler(int irq, void *private)
+{
+	struct iio_dev *indio_dev = private;
+	struct mma9551_data *data = iio_priv(indio_dev);
+	int i, ret, mma_axis = -1;
+	u16 reg;
+	u8 val;
+
+	mutex_lock(&data->mutex);
+
+	for (i = 0; i < 3; i++)
+		if (irq == data->irqs[i]) {
+			mma_axis = i;
+			break;
+		}
+
+	if (mma_axis == -1) {
+		/* IRQ was triggered on 4th line, which we don't use. */
+		dev_warn(&data->client->dev,
+			 "irq triggered on unused line %d\n", data->irqs[3]);
+		goto out;
+	}
+
+	switch (mma_axis) {
+	case mma9551_x:
+		reg = MMA9551_TILT_YZ_ANG_REG;
+		break;
+	case mma9551_y:
+		reg = MMA9551_TILT_XZ_ANG_REG;
+		break;
+	case mma9551_z:
+		reg = MMA9551_TILT_XY_ANG_REG;
+		break;
+	}
+
+	/*
+	 * Read the angle even though we don't use it, otherwise we
+	 * won't get any further interrupts.
+	 */
+	ret = mma9551_read_status_byte(data->client, MMA9551_APPID_TILT,
+				       reg, &val);
+	if (ret < 0) {
+		dev_err(&data->client->dev,
+			"error %d reading tilt register in IRQ\n", ret);
+		goto out;
+	}
+
+	iio_push_event(indio_dev,
+		       IIO_MOD_EVENT_CODE(IIO_INCLI, 0, (mma_axis + 1),
+					  IIO_EV_TYPE_ROC, IIO_EV_DIR_RISING),
+		       iio_get_time_ns());
+
+out:
+	mutex_unlock(&data->mutex);
+
+	return IRQ_HANDLED;
+}
+
+static int mma9551_init(struct mma9551_data *data)
+{
+	int ret;
+
+	ret = mma9551_read_version(data->client);
+	if (ret)
+		return ret;
+
+	/* Power on chip and enable doze mode. */
+	return mma9551_update_config_bits(data->client,
+			 MMA9551_APPID_SLEEP_WAKE,
+			 MMA9551_SLEEP_CFG,
+			 MMA9551_SLEEP_CFG_SCHEN | MMA9551_SLEEP_CFG_SNCEN,
+			 MMA9551_SLEEP_CFG_SCHEN);
+}
+
+static int mma9551_gpio_probe(struct iio_dev *indio_dev)
+{
+	struct gpio_desc *gpio;
+	int i, ret;
+	struct mma9551_data *data = iio_priv(indio_dev);
+	struct device *dev = &data->client->dev;
+
+	for (i = 0; i < MMA9551_GPIO_COUNT; i++) {
+		gpio = devm_gpiod_get_index(dev, MMA9551_GPIO_NAME, i);
+		if (IS_ERR(gpio)) {
+			dev_err(dev, "acpi gpio get index failed\n");
+			return PTR_ERR(gpio);
+		}
+
+		ret = gpiod_direction_input(gpio);
+		if (ret)
+			return ret;
+
+		data->irqs[i] = gpiod_to_irq(gpio);
+		ret = devm_request_threaded_irq(dev, data->irqs[i],
+				NULL, mma9551_event_handler,
+				IRQF_TRIGGER_RISING | IRQF_ONESHOT,
+				MMA9551_IRQ_NAME, indio_dev);
+		if (ret < 0) {
+			dev_err(dev, "request irq %d failed\n", data->irqs[i]);
+			return ret;
+		}
+
+		dev_dbg(dev, "gpio resource, no:%d irq:%d\n",
+			desc_to_gpio(gpio), data->irqs[i]);
+	}
+
+	return 0;
+}
+
+static const char *mma9551_match_acpi_device(struct device *dev)
+{
+	const struct acpi_device_id *id;
+
+	id = acpi_match_device(dev->driver->acpi_match_table, dev);
+	if (!id)
+		return NULL;
+
+	return dev_name(dev);
+}
+
+static int mma9551_probe(struct i2c_client *client,
+			 const struct i2c_device_id *id)
+{
+	struct mma9551_data *data;
+	struct iio_dev *indio_dev;
+	const char *name = NULL;
+	int ret;
+
+	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	data = iio_priv(indio_dev);
+	i2c_set_clientdata(client, indio_dev);
+	data->client = client;
+
+	if (id)
+		name = id->name;
+	else if (ACPI_HANDLE(&client->dev))
+		name = mma9551_match_acpi_device(&client->dev);
+
+	ret = mma9551_init(data);
+	if (ret < 0)
+		return ret;
+
+	mutex_init(&data->mutex);
+
+	indio_dev->dev.parent = &client->dev;
+	indio_dev->channels = mma9551_channels;
+	indio_dev->num_channels = ARRAY_SIZE(mma9551_channels);
+	indio_dev->name = name;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->info = &mma9551_info;
+
+	ret = mma9551_gpio_probe(indio_dev);
+	if (ret < 0)
+		goto out_poweroff;
+
+	ret = iio_device_register(indio_dev);
+	if (ret < 0) {
+		dev_err(&client->dev, "unable to register iio device\n");
+		goto out_poweroff;
+	}
+
+	return 0;
+
+out_poweroff:
+	mma9551_set_device_state(client, false);
+
+	return ret;
+}
+
+static int mma9551_remove(struct i2c_client *client)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(client);
+	struct mma9551_data *data = iio_priv(indio_dev);
+
+	iio_device_unregister(indio_dev);
+	mutex_lock(&data->mutex);
+	mma9551_set_device_state(data->client, false);
+	mutex_unlock(&data->mutex);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int mma9551_suspend(struct device *dev)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+	struct mma9551_data *data = iio_priv(indio_dev);
+
+	mutex_lock(&data->mutex);
+	mma9551_set_device_state(data->client, false);
+	mutex_unlock(&data->mutex);
+
+	return 0;
+}
+
+static int mma9551_resume(struct device *dev)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+	struct mma9551_data *data = iio_priv(indio_dev);
+
+	mutex_lock(&data->mutex);
+	mma9551_set_device_state(data->client, true);
+	mutex_unlock(&data->mutex);
+
+	return 0;
+}
+#else
+#define mma9551_suspend NULL
+#define mma9551_resume NULL
+#endif
+
+static const struct dev_pm_ops mma9551_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(mma9551_suspend, mma9551_resume)
+};
+
+static const struct acpi_device_id mma9551_acpi_match[] = {
+	{"MMA9551", 0},
+	{},
+};
+
+MODULE_DEVICE_TABLE(acpi, mma9551_acpi_match);
+
+static const struct i2c_device_id mma9551_id[] = {
+	{"mma9551", 0},
+	{}
+};
+
+MODULE_DEVICE_TABLE(i2c, mma9551_id);
+
+static struct i2c_driver mma9551_driver = {
+	.driver = {
+		   .name = MMA9551_DRV_NAME,
+		   .acpi_match_table = ACPI_PTR(mma9551_acpi_match),
+		   .pm = &mma9551_pm_ops,
+		   },
+	.probe = mma9551_probe,
+	.remove = mma9551_remove,
+	.id_table = mma9551_id,
+};
+
+module_i2c_driver(mma9551_driver);
+
+MODULE_AUTHOR("Irina Tirdea <irina.tirdea@intel.com>");
+MODULE_AUTHOR("Vlad Dogaru <vlad.dogaru@intel.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("MMA9551L motion-sensing platform driver");