iio: mma8452: add support for MMA8652FC and MMA8653FC

MMA8652FC and MMA8653FC don't provide the transient interrupt source, so
the motion interrupt source is used by providing a new iio_chan_spec
definition, so that other supported devices are not affected by this.

Datasheets for the newly supported devices are available at Freescale's
website:

http://cache.freescale.com/files/sensors/doc/data_sheet/MMA8652FC.pdf
http://cache.freescale.com/files/sensors/doc/data_sheet/MMA8653FC.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>

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

@@ -1,10 +1,12 @@
-Freescale MMA8452Q or MMA8453Q triaxial accelerometer
+Freescale MMA8452Q, MMA8453Q, MMA8652FC or MMA8653FC triaxial accelerometer
 
 Required properties:
 
   - compatible: should contain one of
     * "fsl,mma8452"
     * "fsl,mma8453"
+    * "fsl,mma8652"
+    * "fsl,mma8653"
   - reg: the I2C address of the chip
 
 Optional properties:

drivers/iio/accel/Kconfig

@@ -106,7 +106,7 @@ config MMA8452
 	select IIO_TRIGGERED_BUFFER
 	help
 	  Say yes here to build support for the following Freescale 3-axis
-	  accelerometers: MMA8452Q, MMA8453Q.
+	  accelerometers: 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

@@ -3,6 +3,8 @@
  *
  * MMA8452Q (12 bit)
  * MMA8453Q (10 bit)
+ * MMA8652FC (12 bit)
+ * MMA8653FC (10 bit)
  *
  * Copyright 2014 Peter Meerwald <pmeerw@pmeerw.net>
  *
@@ -84,6 +86,8 @@
 
 #define  MMA8452_DEVICE_ID			0x2a
 #define  MMA8453_DEVICE_ID			0x3a
+#define MMA8652_DEVICE_ID			0x4a
+#define MMA8653_DEVICE_ID			0x5a
 
 struct mma8452_data {
 	struct i2c_client *client;
@@ -791,6 +795,26 @@ static struct attribute_group mma8452_event_attribute_group = {
 	.num_event_specs = ARRAY_SIZE(mma8452_transient_event), \
 }
 
+#define MMA8652_CHANNEL(axis, idx, bits) { \
+	.type = IIO_ACCEL, \
+	.modified = 1, \
+	.channel2 = IIO_MOD_##axis, \
+	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
+		BIT(IIO_CHAN_INFO_CALIBBIAS), \
+	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ) | \
+		BIT(IIO_CHAN_INFO_SCALE), \
+	.scan_index = idx, \
+	.scan_type = { \
+		.sign = 's', \
+		.realbits = (bits), \
+		.storagebits = 16, \
+		.shift = 16 - (bits), \
+		.endianness = IIO_BE, \
+	}, \
+	.event_spec = mma8452_motion_event, \
+	.num_event_specs = ARRAY_SIZE(mma8452_motion_event), \
+}
+
 static const struct iio_chan_spec mma8452_channels[] = {
 	MMA8452_CHANNEL(X, 0, 12),
 	MMA8452_CHANNEL(Y, 1, 12),
@@ -805,9 +829,25 @@ static const struct iio_chan_spec mma8453_channels[] = {
 	IIO_CHAN_SOFT_TIMESTAMP(3),
 };
 
+static const struct iio_chan_spec mma8652_channels[] = {
+	MMA8652_CHANNEL(X, 0, 12),
+	MMA8652_CHANNEL(Y, 1, 12),
+	MMA8652_CHANNEL(Z, 2, 12),
+	IIO_CHAN_SOFT_TIMESTAMP(3),
+};
+
+static const struct iio_chan_spec mma8653_channels[] = {
+	MMA8652_CHANNEL(X, 0, 10),
+	MMA8652_CHANNEL(Y, 1, 10),
+	MMA8652_CHANNEL(Z, 2, 10),
+	IIO_CHAN_SOFT_TIMESTAMP(3),
+};
+
 enum {
 	mma8452,
 	mma8453,
+	mma8652,
+	mma8653,
 };
 
 static const struct mma_chip_info mma_chip_info_table[] = {
@@ -850,6 +890,38 @@ static const struct mma_chip_info mma_chip_info_table[] = {
 		.ev_ths_mask = MMA8452_TRANSIENT_THS_MASK,
 		.ev_count = MMA8452_TRANSIENT_COUNT,
 	},
+	[mma8652] = {
+		.chip_id = MMA8652_DEVICE_ID,
+		.channels = mma8652_channels,
+		.num_channels = ARRAY_SIZE(mma8652_channels),
+		.mma_scales = { {0, 9577}, {0, 19154}, {0, 38307} },
+		.ev_cfg = MMA8452_FF_MT_CFG,
+		.ev_cfg_ele = MMA8452_FF_MT_CFG_ELE,
+		.ev_cfg_chan_shift = 3,
+		.ev_src = MMA8452_FF_MT_SRC,
+		.ev_src_xe = MMA8452_FF_MT_SRC_XHE,
+		.ev_src_ye = MMA8452_FF_MT_SRC_YHE,
+		.ev_src_ze = MMA8452_FF_MT_SRC_ZHE,
+		.ev_ths = MMA8452_FF_MT_THS,
+		.ev_ths_mask = MMA8452_FF_MT_THS_MASK,
+		.ev_count = MMA8452_FF_MT_COUNT,
+	},
+	[mma8653] = {
+		.chip_id = MMA8653_DEVICE_ID,
+		.channels = mma8653_channels,
+		.num_channels = ARRAY_SIZE(mma8653_channels),
+		.mma_scales = { {0, 38307}, {0, 76614}, {0, 153228} },
+		.ev_cfg = MMA8452_FF_MT_CFG,
+		.ev_cfg_ele = MMA8452_FF_MT_CFG_ELE,
+		.ev_cfg_chan_shift = 3,
+		.ev_src = MMA8452_FF_MT_SRC,
+		.ev_src_xe = MMA8452_FF_MT_SRC_XHE,
+		.ev_src_ye = MMA8452_FF_MT_SRC_YHE,
+		.ev_src_ze = MMA8452_FF_MT_SRC_ZHE,
+		.ev_ths = MMA8452_FF_MT_THS,
+		.ev_ths_mask = MMA8452_FF_MT_THS_MASK,
+		.ev_count = MMA8452_FF_MT_COUNT,
+	},
 };
 
 static struct attribute *mma8452_attributes[] = {
@@ -972,6 +1044,8 @@ 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] },
+	{ .compatible = "fsl,mma8652", .data = &mma_chip_info_table[mma8652] },
+	{ .compatible = "fsl,mma8653", .data = &mma_chip_info_table[mma8653] },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, mma8452_dt_ids);
@@ -984,13 +1058,6 @@ static int mma8452_probe(struct i2c_client *client,
 	int ret;
 	const struct of_device_id *match;
 
-	ret = i2c_smbus_read_byte_data(client, MMA8452_WHO_AM_I);
-	if (ret < 0)
-		return ret;
-
-	if (ret != MMA8452_DEVICE_ID && ret != MMA8453_DEVICE_ID)
-		return -ENODEV;
-
 	match = of_match_device(mma8452_dt_ids, &client->dev);
 	if (!match) {
 		dev_err(&client->dev, "unknown device model\n");
@@ -1006,6 +1073,21 @@ static int mma8452_probe(struct i2c_client *client,
 	mutex_init(&data->lock);
 	data->chip_info = match->data;
 
+	ret = i2c_smbus_read_byte_data(client, MMA8452_WHO_AM_I);
+	if (ret < 0)
+		return ret;
+
+	switch (ret) {
+	case MMA8452_DEVICE_ID:
+	case MMA8453_DEVICE_ID:
+	case MMA8652_DEVICE_ID:
+	case MMA8653_DEVICE_ID:
+		if (ret == data->chip_info->chip_id)
+			break;
+	default:
+		return -ENODEV;
+	}
+
 	dev_info(&client->dev, "registering %s accelerometer; ID 0x%x\n",
 		 match->compatible, data->chip_info->chip_id);
 
@@ -1138,6 +1220,8 @@ static SIMPLE_DEV_PM_OPS(mma8452_pm_ops, mma8452_suspend, mma8452_resume);
 static const struct i2c_device_id mma8452_id[] = {
 	{ "mma8452", mma8452 },
 	{ "mma8453", mma8453 },
+	{ "mma8652", mma8652 },
+	{ "mma8653", mma8653 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, mma8452_id);