[PATCH v2 0/8] iio: mma8452: support more devices and improve driver

[PATCH v2 0/8] iio: mma8452: support more devices and improve driver

[Martin Kepplinger]

This is the 2nd version that adds support for motion interrupts and 3 more
accelerometer chips, two of which use them because they don't support the
until now included transient interrupt sources:

MMA8453Q, MMA8652FC and MMA8653FC; datasheets are in the commit messages.

The driver and module name remains the same, seperating it from the device
names it now supports.

On top of this, there are minor documentation additions, and more notably,
the change of the existing iio event type from IIO_EV_TYPE_THRESH to
IIO_EV_TYPE_MAG since it's the magnitude of the threshold that is relevant
for these devices, not a signed value.

Please review and test if you can. For MMA8452Q, other than the event type,
nothing should have changed.

[PATCH 1/8] iio: mma8452: refactor for seperating chip specific data

[Martin Kepplinger]

This adds a struct mma_chip_info to hold data that will remain specific to
the chip in use. It is provided during probe() and linked in
struct of_device_id.

Also this suggests that the driver is called "mma8452" and now handles the
MMA8452Q device, but is not limited to it.

Signed-off-by: Martin Kepplinger <martin.kepplinger-SN7IsUiht6C/RdPyistoZJqQE7yCjDx5@public.gmane.org>
Signed-off-by: Christoph Muellner <christoph.muellner-SN7IsUiht6C/RdPyistoZJqQE7yCjDx5@public.gmane.org>
---
 drivers/iio/accel/mma8452.c | 161 ++++++++++++++++++++++++++++++--------------
 1 file changed, 110 insertions(+), 51 deletions(-)

diff --git a/drivers/iio/accel/mma8452.c b/drivers/iio/accel/mma8452.c
index e8e2077..b2ebfcb 100644
--- a/drivers/iio/accel/mma8452.c
+++ b/drivers/iio/accel/mma8452.c
@@ -23,7 +23,9 @@
 #include <linux/iio/triggered_buffer.h>
 #include <linux/iio/events.h>
 #include <linux/delay.h>
+#include <linux/of_device.h>
 
+#define DRIVER_NAME "mma8452"
 #define MMA8452_STATUS 0x00
 #define MMA8452_OUT_X 0x01 /* MSB first, 12-bit  */
 #define MMA8452_OUT_Y 0x03
@@ -78,6 +80,25 @@ struct mma8452_data {
 	struct mutex lock;
 	u8 ctrl_reg1;
 	u8 data_cfg;
+	const struct mma_chip_info *chip_info;
+};
+
+struct mma_chip_info {
+	u8 chip_id;
+	const struct iio_chan_spec *channels;
+	int num_channels;
+	/* 3 modes: 2g, 4g, 8g; 2 ints: m/s^2 and micro m/s^2 */
+	const int mma_scales[3][2];
+	u8 ev_cfg;
+	u8 ev_cfg_ele;
+	u8 ev_cfg_chan_shift;
+	u8 ev_src;
+	u8 ev_src_xe;
+	u8 ev_src_ye;
+	u8 ev_src_ze;
+	u8 ev_ths;
+	u8 ev_ths_mask;
+	u8 ev_count;
 };
 
 static int mma8452_drdy(struct mma8452_data *data)
@@ -143,16 +164,6 @@ static const int mma8452_samp_freq[8][2] = {
 	{6, 250000}, {1, 560000}
 };
 
-/*
- * Hardware has fullscale of -2G, -4G, -8G corresponding to raw value -2048
- * The userspace interface uses m/s^2 and we declare micro units
- * So scale factor is given by:
- * 	g * N * 1000000 / 2048 for N = 2, 4, 8 and g=9.80665
- */
-static const int mma8452_scales[3][2] = {
-	{0, 9577}, {0, 19154}, {0, 38307}
-};
-
 /* Datasheet table 35  (step time vs sample frequency) */
 static const int mma8452_transient_time_step_us[8] = {
 	1250,
@@ -187,8 +198,11 @@ static ssize_t mma8452_show_samp_freq_avail(struct device *dev,
 static ssize_t mma8452_show_scale_avail(struct device *dev,
 				struct device_attribute *attr, char *buf)
 {
-	return mma8452_show_int_plus_micros(buf, mma8452_scales,
-		ARRAY_SIZE(mma8452_scales));
+	struct mma8452_data *data = iio_priv(i2c_get_clientdata(
+					     to_i2c_client(dev)));
+
+	return mma8452_show_int_plus_micros(buf, data->chip_info->mma_scales,
+		ARRAY_SIZE(data->chip_info->mma_scales));
 }
 
 static ssize_t mma8452_show_hp_cutoff_avail(struct device *dev,
@@ -219,8 +233,8 @@ static int mma8452_get_samp_freq_index(struct mma8452_data *data,
 static int mma8452_get_scale_index(struct mma8452_data *data,
 	int val, int val2)
 {
-	return mma8452_get_int_plus_micros_index(mma8452_scales,
-		ARRAY_SIZE(mma8452_scales), val, val2);
+	return mma8452_get_int_plus_micros_index(data->chip_info->mma_scales,
+		ARRAY_SIZE(data->chip_info->mma_scales), val, val2);
 }
 
 static int mma8452_get_hp_filter_index(struct mma8452_data *data,
@@ -229,7 +243,7 @@ static int mma8452_get_hp_filter_index(struct mma8452_data *data,
 	int i = mma8452_get_odr_index(data);
 
 	return mma8452_get_int_plus_micros_index(mma8452_hp_filter_cutoff[i],
-		ARRAY_SIZE(mma8452_scales[0]), val, val2);
+		ARRAY_SIZE(data->chip_info->mma_scales[0]), val, val2);
 }
 
 static int mma8452_read_hp_filter(struct mma8452_data *data, int *hz, int *uHz)
@@ -266,13 +280,14 @@ static int mma8452_read_raw(struct iio_dev *indio_dev,
 		mutex_unlock(&data->lock);
 		if (ret < 0)
 			return ret;
-		*val = sign_extend32(
-			be16_to_cpu(buffer[chan->scan_index]) >> 4, 11);
+		*val = sign_extend32(be16_to_cpu(
+			buffer[chan->scan_index]) >> chan->scan_type.shift,
+			chan->scan_type.realbits - 1);
 		return IIO_VAL_INT;
 	case IIO_CHAN_INFO_SCALE:
 		i = data->data_cfg & MMA8452_DATA_CFG_FS_MASK;
-		*val = mma8452_scales[i][0];
-		*val2 = mma8452_scales[i][1];
+		*val = data->chip_info->mma_scales[i][0];
+		*val2 = data->chip_info->mma_scales[i][1];
 		return IIO_VAL_INT_PLUS_MICRO;
 	case IIO_CHAN_INFO_SAMP_FREQ:
 		i = mma8452_get_odr_index(data);
@@ -420,16 +435,16 @@ static int mma8452_read_thresh(struct iio_dev *indio_dev,
 	switch (info) {
 	case IIO_EV_INFO_VALUE:
 		ret = i2c_smbus_read_byte_data(data->client,
-					       MMA8452_TRANSIENT_THS);
+					       data->chip_info->ev_ths);
 		if (ret < 0)
 			return ret;
 
-		*val = ret & MMA8452_TRANSIENT_THS_MASK;
+		*val = ret & data->chip_info->ev_ths_mask;
 		return IIO_VAL_INT;
 
 	case IIO_EV_INFO_PERIOD:
 		ret = i2c_smbus_read_byte_data(data->client,
-					       MMA8452_TRANSIENT_COUNT);
+					       data->chip_info->ev_count);
 		if (ret < 0)
 			return ret;
 
@@ -472,8 +487,11 @@ static int mma8452_write_thresh(struct iio_dev *indio_dev,
 
 	switch (info) {
 	case IIO_EV_INFO_VALUE:
-		return mma8452_change_config(data, MMA8452_TRANSIENT_THS,
-					     val & MMA8452_TRANSIENT_THS_MASK);
+		if (val < 0 || val > 127) /* LSB 0.6178 m/s^2 */
+			return -EINVAL;
+
+		return mma8452_change_config(data, data->chip_info->ev_ths,
+					     val);
 
 	case IIO_EV_INFO_PERIOD:
 		steps = (val * USEC_PER_SEC + val2) /
@@ -483,7 +501,7 @@ static int mma8452_write_thresh(struct iio_dev *indio_dev,
 		if (steps > 0xff)
 			return -EINVAL;
 
-		return mma8452_change_config(data, MMA8452_TRANSIENT_COUNT,
+		return mma8452_change_config(data, data->chip_info->ev_count,
 					     steps);
 	case IIO_EV_INFO_HIGH_PASS_FILTER_3DB:
 		reg = i2c_smbus_read_byte_data(data->client,
@@ -512,13 +530,15 @@ static int mma8452_read_event_config(struct iio_dev *indio_dev,
 				     enum iio_event_direction dir)
 {
 	struct mma8452_data *data = iio_priv(indio_dev);
+	const struct mma_chip_info *chip = data->chip_info;
 	int ret;
 
-	ret = i2c_smbus_read_byte_data(data->client, MMA8452_TRANSIENT_CFG);
+	ret = i2c_smbus_read_byte_data(data->client,
+				       data->chip_info->ev_cfg);
 	if (ret < 0)
 		return ret;
 
-	return ret & MMA8452_TRANSIENT_CFG_CHAN(chan->scan_index) ? 1 : 0;
+	return ret & BIT(chan->scan_index + chip->ev_cfg_chan_shift) ? 1 : 0;
 }
 
 static int mma8452_write_event_config(struct iio_dev *indio_dev,
@@ -528,20 +548,21 @@ static int mma8452_write_event_config(struct iio_dev *indio_dev,
 				      int state)
 {
 	struct mma8452_data *data = iio_priv(indio_dev);
+	const struct mma_chip_info *chip = data->chip_info;
 	int val;
 
-	val = i2c_smbus_read_byte_data(data->client, MMA8452_TRANSIENT_CFG);
+	val = i2c_smbus_read_byte_data(data->client, chip->ev_cfg);
 	if (val < 0)
 		return val;
 
 	if (state)
-		val |= MMA8452_TRANSIENT_CFG_CHAN(chan->scan_index);
+		val |= BIT(chan->scan_index + chip->ev_cfg_chan_shift);
 	else
-		val &= ~MMA8452_TRANSIENT_CFG_CHAN(chan->scan_index);
+		val &= ~BIT(chan->scan_index + chip->ev_cfg_chan_shift);
 
 	val |= MMA8452_TRANSIENT_CFG_ELE;
 
-	return mma8452_change_config(data, MMA8452_TRANSIENT_CFG, val);
+	return mma8452_change_config(data, chip->ev_cfg, val);
 }
 
 static void mma8452_transient_interrupt(struct iio_dev *indio_dev)
@@ -550,25 +571,25 @@ static void mma8452_transient_interrupt(struct iio_dev *indio_dev)
 	s64 ts = iio_get_time_ns();
 	int src;
 
-	src = i2c_smbus_read_byte_data(data->client, MMA8452_TRANSIENT_SRC);
+	src = i2c_smbus_read_byte_data(data->client, data->chip_info->ev_src);
 	if (src < 0)
 		return;
 
-	if (src & MMA8452_TRANSIENT_SRC_XTRANSE)
+	if (src & data->chip_info->ev_src_xe)
 		iio_push_event(indio_dev,
 			       IIO_MOD_EVENT_CODE(IIO_ACCEL, 0, IIO_MOD_X,
 						  IIO_EV_TYPE_THRESH,
 						  IIO_EV_DIR_RISING),
 			       ts);
 
-	if (src & MMA8452_TRANSIENT_SRC_YTRANSE)
+	if (src & data->chip_info->ev_src_ye)
 		iio_push_event(indio_dev,
 			       IIO_MOD_EVENT_CODE(IIO_ACCEL, 0, IIO_MOD_Y,
 						  IIO_EV_TYPE_THRESH,
 						  IIO_EV_DIR_RISING),
 			       ts);
 
-	if (src & MMA8452_TRANSIENT_SRC_ZTRANSE)
+	if (src & data->chip_info->ev_src_ze)
 		iio_push_event(indio_dev,
 			       IIO_MOD_EVENT_CODE(IIO_ACCEL, 0, IIO_MOD_Z,
 						  IIO_EV_TYPE_THRESH,
@@ -669,7 +690,7 @@ static struct attribute_group mma8452_event_attribute_group = {
 	.name = "events",
 };
 
-#define MMA8452_CHANNEL(axis, idx) { \
+#define MMA8452_CHANNEL(axis, idx, bits) { \
 	.type = IIO_ACCEL, \
 	.modified = 1, \
 	.channel2 = IIO_MOD_##axis, \
@@ -681,9 +702,9 @@ static struct attribute_group mma8452_event_attribute_group = {
 	.scan_index = idx, \
 	.scan_type = { \
 		.sign = 's', \
-		.realbits = 12, \
+		.realbits = (bits), \
 		.storagebits = 16, \
-		.shift = 4, \
+		.shift = 16 - (bits), \
 		.endianness = IIO_BE, \
 	}, \
 	.event_spec = mma8452_transient_event, \
@@ -691,12 +712,42 @@ static struct attribute_group mma8452_event_attribute_group = {
 }
 
 static const struct iio_chan_spec mma8452_channels[] = {
-	MMA8452_CHANNEL(X, 0),
-	MMA8452_CHANNEL(Y, 1),
-	MMA8452_CHANNEL(Z, 2),
+	MMA8452_CHANNEL(X, 0, 12),
+	MMA8452_CHANNEL(Y, 1, 12),
+	MMA8452_CHANNEL(Z, 2, 12),
 	IIO_CHAN_SOFT_TIMESTAMP(3),
 };
 
+enum {
+	mma8452,
+};
+
+/*
+ * 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 is given by:
+ *	g * N * 1000000 / 2048 for N = 2, 4, 8 and g=9.80665
+ */
+
+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),
+		.mma_scales = { {0, 9577}, {0, 19154}, {0, 38307} },
+		.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[] = {
 	&iio_dev_attr_sampling_frequency_available.dev_attr.attr,
 	&iio_dev_attr_in_accel_scale_available.dev_attr.attr,
@@ -813,12 +864,18 @@ static int mma8452_reset(struct i2c_client *client)
 	return -ETIMEDOUT;
 }
 
+static const struct of_device_id mma8452_dt_ids[] = {
+	{ .compatible = "fsl,mma8452", .data = &mma_chip_info_table[mma8452] },
+	{ }
+};
+
 static int mma8452_probe(struct i2c_client *client,
 			 const struct i2c_device_id *id)
 {
 	struct mma8452_data *data;
 	struct iio_dev *indio_dev;
 	int ret;
+	const struct of_device_id *match;
 
 	ret = i2c_smbus_read_byte_data(client, MMA8452_WHO_AM_I);
 	if (ret < 0)
@@ -826,21 +883,28 @@ static int mma8452_probe(struct i2c_client *client,
 	if (ret != MMA8452_DEVICE_ID)
 		return -ENODEV;
 
+	match = of_match_device(mma8452_dt_ids, &client->dev);
+	if (!match) {
+		dev_err(&client->dev, "unknown device model\n");
+		return -ENODEV;
+	}
+
 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
 	if (!indio_dev)
 		return -ENOMEM;
 
 	data = iio_priv(indio_dev);
 	data->client = client;
+	data->chip_info = match->data;
 	mutex_init(&data->lock);
 
 	i2c_set_clientdata(client, indio_dev);
 	indio_dev->info = &mma8452_info;
-	indio_dev->name = id->name;
+	indio_dev->name = DRIVER_NAME;
 	indio_dev->dev.parent = &client->dev;
 	indio_dev->modes = INDIO_DIRECT_MODE;
-	indio_dev->channels = mma8452_channels;
-	indio_dev->num_channels = ARRAY_SIZE(mma8452_channels);
+	indio_dev->channels = data->chip_info->channels;
+	indio_dev->num_channels = data->chip_info->num_channels;
 	indio_dev->available_scan_masks = mma8452_scan_masks;
 
 	ret = mma8452_reset(client);
@@ -959,19 +1023,14 @@ static SIMPLE_DEV_PM_OPS(mma8452_pm_ops, mma8452_suspend, mma8452_resume);
 #endif
 
 static const struct i2c_device_id mma8452_id[] = {
-	{ "mma8452", 0 },
+	{ "mma8452", mma8452 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, mma8452_id);
 
-static const struct of_device_id mma8452_dt_ids[] = {
-	{ .compatible = "fsl,mma8452" },
-	{ }
-};
-
 static struct i2c_driver mma8452_driver = {
 	.driver = {
-		.name	= "mma8452",
+		.name	= DRIVER_NAME,
 		.of_match_table = of_match_ptr(mma8452_dt_ids),
 		.pm	= MMA8452_PM_OPS,
 	},
-- 
2.1.4

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[PATCH 2/8] iio: mma8452: add support for MMA8453Q accelerometer chip

[Martin Kepplinger]

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

Signed-off-by: Martin Kepplinger <martin.kepplinger-SN7IsUiht6C/RdPyistoZJqQE7yCjDx5@public.gmane.org>
Signed-off-by: Christoph Muellner <christoph.muellner-SN7IsUiht6C/RdPyistoZJqQE7yCjDx5@public.gmane.org>
---
 drivers/iio/accel/Kconfig   |  6 +++---
 drivers/iio/accel/mma8452.c | 41 ++++++++++++++++++++++++++++++++++++++---
 2 files changed, 41 insertions(+), 6 deletions(-)

diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig
index 00e7bcb..91fab16 100644
--- a/drivers/iio/accel/Kconfig
+++ b/drivers/iio/accel/Kconfig
@@ -87,13 +87,13 @@ config KXSD9
 	  will be called kxsd9.
 
 config MMA8452
-	tristate "Freescale MMA8452Q Accelerometer Driver"
+	tristate "Freescale MMA8452 Accelerometer 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.
diff --git a/drivers/iio/accel/mma8452.c b/drivers/iio/accel/mma8452.c
index b2ebfcb..209b0d7 100644
--- a/drivers/iio/accel/mma8452.c
+++ b/drivers/iio/accel/mma8452.c
@@ -1,5 +1,8 @@
 /*
- * mma8452.c - Support for Freescale MMA8452Q 3-axis 12-bit accelerometer
+ * mma8452.c - Support for following Freescale 3-axis accelerometers:
+ *
+ *	MMA8452Q
+ *	MMA8453Q
  *
  * Copyright 2014 Peter Meerwald <pmeerw-jW+XmwGofnusTnJN9+BGXg@public.gmane.org>
  *
@@ -27,7 +30,7 @@
 
 #define DRIVER_NAME "mma8452"
 #define MMA8452_STATUS 0x00
-#define MMA8452_OUT_X 0x01 /* MSB first, 12-bit  */
+#define MMA8452_OUT_X 0x01 /* MSB first, 10 or 12-bit  */
 #define MMA8452_OUT_Y 0x03
 #define MMA8452_OUT_Z 0x05
 #define MMA8452_INT_SRC 0x0c
@@ -74,6 +77,7 @@
 #define MMA8452_INT_TRANS	BIT(5)
 
 #define MMA8452_DEVICE_ID 0x2a
+#define MMA8453_DEVICE_ID 0x3a
 
 struct mma8452_data {
 	struct i2c_client *client;
@@ -718,8 +722,16 @@ 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,
 };
 
 /*
@@ -747,7 +759,24 @@ 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[] = {
 	&iio_dev_attr_sampling_frequency_available.dev_attr.attr,
 	&iio_dev_attr_in_accel_scale_available.dev_attr.attr,
@@ -866,6 +895,7 @@ 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] },
 	{ }
 };
 
@@ -880,7 +910,8 @@ 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);
@@ -898,6 +929,9 @@ static int mma8452_probe(struct i2c_client *client,
 	data->chip_info = match->data;
 	mutex_init(&data->lock);
 
+	dev_info(&client->dev, "registering %s accelerometer; ID 0x%x\n",
+		match->compatible, data->chip_info->chip_id);
+
 	i2c_set_clientdata(client, indio_dev);
 	indio_dev->info = &mma8452_info;
 	indio_dev->name = DRIVER_NAME;
@@ -1024,6 +1058,7 @@ 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);
-- 
2.1.4

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[PATCH 3/8] iio: mma8452: add freefall / motion interrupt source

[Martin Kepplinger]

This adds the freefall / motion interrupt source definitions to the driver.
It is not in use now, but mma_chip_info and iio_chan_spec can easily be
adapted to use it instead of the transient interrupt source.

Signed-off-by: Martin Kepplinger <martin.kepplinger-SN7IsUiht6C/RdPyistoZJqQE7yCjDx5@public.gmane.org>
Signed-off-by: Christoph Muellner <christoph.muellner-SN7IsUiht6C/RdPyistoZJqQE7yCjDx5@public.gmane.org>
---
 drivers/iio/accel/mma8452.c | 45 ++++++++++++++++++++++++++++++++++++---------
 1 file changed, 36 insertions(+), 9 deletions(-)

diff --git a/drivers/iio/accel/mma8452.c b/drivers/iio/accel/mma8452.c
index 209b0d7..0498b6e 100644
--- a/drivers/iio/accel/mma8452.c
+++ b/drivers/iio/accel/mma8452.c
@@ -38,9 +38,18 @@
 #define MMA8452_DATA_CFG 0x0e
 #define MMA8452_HP_FILTER_CUTOFF 0x0f
 #define MMA8452_HP_FILTER_CUTOFF_SEL_MASK	(BIT(0) | BIT(1))
+#define MMA8452_FF_MT_CFG 0x15
+#define MMA8452_FF_MT_CFG_OAE			BIT(6)
+#define MMA8452_FF_MT_CFG_ELE			BIT(7)
+#define MMA8452_FF_MT_SRC 0x16
+#define MMA8452_FF_MT_SRC_XHE			BIT(1)
+#define MMA8452_FF_MT_SRC_YHE			BIT(3)
+#define MMA8452_FF_MT_SRC_ZHE			BIT(5)
+#define MMA8452_FF_MT_THS 0x17
+#define MMA8452_FF_MT_THS_MASK 0x7f
+#define MMA8452_FF_MT_COUNT 0x18
 #define MMA8452_TRANSIENT_CFG 0x1d
 #define MMA8452_TRANSIENT_CFG_ELE		BIT(4)
-#define MMA8452_TRANSIENT_CFG_CHAN(chan)	BIT(chan + 1)
 #define MMA8452_TRANSIENT_CFG_HPF_BYP		BIT(0)
 #define MMA8452_TRANSIENT_SRC 0x1e
 #define MMA8452_TRANSIENT_SRC_XTRANSE		BIT(1)
@@ -74,6 +83,7 @@
 #define MMA8452_DATA_CFG_HPF_MASK BIT(4)
 
 #define MMA8452_INT_DRDY	BIT(0)
+#define MMA8452_INT_FF_MT	BIT(2)
 #define MMA8452_INT_TRANS	BIT(5)
 
 #define MMA8452_DEVICE_ID 0x2a
@@ -564,7 +574,8 @@ static int mma8452_write_event_config(struct iio_dev *indio_dev,
 	else
 		val &= ~BIT(chan->scan_index + chip->ev_cfg_chan_shift);
 
-	val |= MMA8452_TRANSIENT_CFG_ELE;
+	val |= chip->ev_cfg_ele;
+	val |= MMA8452_FF_MT_CFG_OAE;
 
 	return mma8452_change_config(data, chip->ev_cfg, val);
 }
@@ -605,6 +616,7 @@ static irqreturn_t mma8452_interrupt(int irq, void *p)
 {
 	struct iio_dev *indio_dev = p;
 	struct mma8452_data *data = iio_priv(indio_dev);
+	const struct mma_chip_info *chip = data->chip_info;
 	int ret = IRQ_NONE;
 	int src;
 
@@ -617,7 +629,10 @@ static irqreturn_t mma8452_interrupt(int irq, void *p)
 		ret = IRQ_HANDLED;
 	}
 
-	if (src & MMA8452_INT_TRANS) {
+	if ((src & MMA8452_INT_TRANS &&
+	     chip->ev_src == MMA8452_TRANSIENT_SRC) ||
+	    (src & MMA8452_INT_FF_MT &&
+	     chip->ev_src == MMA8452_FF_MT_SRC)) {
 		mma8452_transient_interrupt(indio_dev);
 		ret = IRQ_HANDLED;
 	}
@@ -678,6 +693,16 @@ static const struct iio_event_spec mma8452_transient_event[] = {
 	},
 };
 
+static const struct iio_event_spec mma8452_motion_event[] = {
+	{
+		.type = IIO_EV_TYPE_THRESH,
+		.dir = IIO_EV_DIR_RISING,
+		.mask_separate = BIT(IIO_EV_INFO_ENABLE),
+		.mask_shared_by_type = BIT(IIO_EV_INFO_VALUE) |
+					BIT(IIO_EV_INFO_PERIOD)
+	},
+};
+
 /*
  * Threshold is configured in fixed 8G/127 steps regardless of
  * currently selected scale for measurement.
@@ -962,13 +987,15 @@ static int mma8452_probe(struct i2c_client *client,
 
 	if (client->irq) {
 		/*
-		 * Although we enable the transient interrupt source once and
-		 * for all here the transient event detection itself is not
-		 * enabled until userspace asks for it by
-		 * mma8452_write_event_config()
+		 * Although we enable the interrupt sources once and for
+		 * all here the event detection itself is not enabled until
+		 * userspace asks for it by mma8452_write_event_config()
 		 */
-		int supported_interrupts = MMA8452_INT_DRDY | MMA8452_INT_TRANS;
-		int enabled_interrupts = MMA8452_INT_TRANS;
+		int supported_interrupts = MMA8452_INT_DRDY |
+					   MMA8452_INT_TRANS |
+					   MMA8452_INT_FF_MT;
+		int enabled_interrupts = MMA8452_INT_TRANS |
+					 MMA8452_INT_FF_MT;
 
 		/* Assume wired to INT1 pin */
 		ret = i2c_smbus_write_byte_data(client,
-- 
2.1.4

[PATCH 4/8] iio: mma8452: add support for MMA8652FC and MMA8653FC accelerometers

[Martin Kepplinger]

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-SN7IsUiht6C/RdPyistoZJqQE7yCjDx5@public.gmane.org>
Signed-off-by: Christoph Muellner <christoph.muellner-SN7IsUiht6C/RdPyistoZJqQE7yCjDx5@public.gmane.org>
---
 drivers/iio/accel/Kconfig   |  2 +-
 drivers/iio/accel/mma8452.c | 79 ++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 79 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig
index 91fab16..684c8b5 100644
--- a/drivers/iio/accel/Kconfig
+++ b/drivers/iio/accel/Kconfig
@@ -93,7 +93,7 @@ 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.
diff --git a/drivers/iio/accel/mma8452.c b/drivers/iio/accel/mma8452.c
index 0498b6e..ccce925 100644
--- a/drivers/iio/accel/mma8452.c
+++ b/drivers/iio/accel/mma8452.c
@@ -3,6 +3,8 @@
  *
  *	MMA8452Q
  *	MMA8453Q
+ *	MMA8652FC
+ *	MMA8653FC
  *
  * Copyright 2014 Peter Meerwald <pmeerw-jW+XmwGofnusTnJN9+BGXg@public.gmane.org>
  *
@@ -88,6 +90,8 @@
 
 #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;
@@ -740,6 +744,26 @@ 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),
@@ -754,9 +778,25 @@ 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,
 };
 
 /*
@@ -800,6 +840,38 @@ 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[] = {
@@ -921,6 +993,8 @@ 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] },
 	{ }
 };
 
@@ -936,7 +1010,8 @@ static int mma8452_probe(struct i2c_client *client,
 	if (ret < 0)
 		return ret;
 
-	if (ret != MMA8452_DEVICE_ID && ret != MMA8453_DEVICE_ID)
+	if (ret != MMA8452_DEVICE_ID && ret != MMA8453_DEVICE_ID &&
+	    ret != MMA8652_DEVICE_ID && ret != MMA8653_DEVICE_ID)
 		return -ENODEV;
 
 	match = of_match_device(mma8452_dt_ids, &client->dev);
@@ -1086,6 +1161,8 @@ 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);
-- 
2.1.4

[PATCH 5/8] iio: mma8452: add devicetree documentation

[Martin Kepplinger]

Signed-off-by: Martin Kepplinger <martin.kepplinger-SN7IsUiht6C/RdPyistoZJqQE7yCjDx5@public.gmane.org>
Signed-off-by: Christoph Muellner <christoph.muellner-SN7IsUiht6C/RdPyistoZJqQE7yCjDx5@public.gmane.org>
---
 .../devicetree/bindings/iio/accel/mma8452.txt       | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/accel/mma8452.txt

diff --git a/Documentation/devicetree/bindings/iio/accel/mma8452.txt b/Documentation/devicetree/bindings/iio/accel/mma8452.txt
new file mode 100644
index 0000000..8d98e05
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/accel/mma8452.txt
@@ -0,0 +1,21 @@
+Freescale MMA8452Q, MMA8453Q, MMA8652FC or MMA8653FC triaxial accelerometer
+
+Required properties:
+
+  - compatible: should be "fsl,mma8653", "fsl,mma8652", "fsl,mma8453" or
+    "fsl,mma8452" respectively.
+  - 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:
+
+	mma8653fc@1d {
+		compatible = "fsl,mma8653";
+		reg = <0x1d>;
+		interrupt-parent = <&gpio1>;
+		interrupts = <5 0>;
+	};
-- 
2.1.4

[PATCH 6/8] iio: mma8452: add copyright notice comment

[Martin Kepplinger]

Signed-off-by: Martin Kepplinger <martin.kepplinger-SN7IsUiht6C/RdPyistoZJqQE7yCjDx5@public.gmane.org>
Signed-off-by: Christoph Muellner <christoph.muellner-SN7IsUiht6C/RdPyistoZJqQE7yCjDx5@public.gmane.org>
---
 drivers/iio/accel/mma8452.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/iio/accel/mma8452.c b/drivers/iio/accel/mma8452.c
index ccce925..7f6e3b4 100644
--- a/drivers/iio/accel/mma8452.c
+++ b/drivers/iio/accel/mma8452.c
@@ -6,6 +6,7 @@
  *	MMA8652FC
  *	MMA8653FC
  *
+ * Copyright 2015 Martin Kepplinger <martin.kepplinger-SN7IsUiht6C/RdPyistoZJqQE7yCjDx5@public.gmane.org>
  * Copyright 2014 Peter Meerwald <pmeerw-jW+XmwGofnusTnJN9+BGXg@public.gmane.org>
  *
  * This file is subject to the terms and conditions of version 2 of
-- 
2.1.4

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[PATCH 7/8] iio: mma8452: change iio event type to IIO_EV_TYPE_MAG

[Martin Kepplinger]

IIO_EV_TYPE_THRESH in rising direction describes an event where the
threshold is crossed in rising direction, positive or negative values
being possible. This is not the case here.

Since the threshold is no signed value and only the magnitude is compared,
IIO_EV_TYPE_MAG is what describes the behaviour of these devices, see the
sysfs-bus-iio ABI Documentation.

Signed-off-by: Martin Kepplinger <martin.kepplinger-SN7IsUiht6C/RdPyistoZJqQE7yCjDx5@public.gmane.org>
Signed-off-by: Christoph Muellner <christoph.muellner-SN7IsUiht6C/RdPyistoZJqQE7yCjDx5@public.gmane.org>
---
 drivers/iio/accel/mma8452.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/iio/accel/mma8452.c b/drivers/iio/accel/mma8452.c
index 7f6e3b4..e23ebd0 100644
--- a/drivers/iio/accel/mma8452.c
+++ b/drivers/iio/accel/mma8452.c
@@ -598,21 +598,21 @@ static void mma8452_transient_interrupt(struct iio_dev *indio_dev)
 	if (src & data->chip_info->ev_src_xe)
 		iio_push_event(indio_dev,
 			       IIO_MOD_EVENT_CODE(IIO_ACCEL, 0, IIO_MOD_X,
-						  IIO_EV_TYPE_THRESH,
+						  IIO_EV_TYPE_MAG,
 						  IIO_EV_DIR_RISING),
 			       ts);
 
 	if (src & data->chip_info->ev_src_ye)
 		iio_push_event(indio_dev,
 			       IIO_MOD_EVENT_CODE(IIO_ACCEL, 0, IIO_MOD_Y,
-						  IIO_EV_TYPE_THRESH,
+						  IIO_EV_TYPE_MAG,
 						  IIO_EV_DIR_RISING),
 			       ts);
 
 	if (src & data->chip_info->ev_src_ze)
 		iio_push_event(indio_dev,
 			       IIO_MOD_EVENT_CODE(IIO_ACCEL, 0, IIO_MOD_Z,
-						  IIO_EV_TYPE_THRESH,
+						  IIO_EV_TYPE_MAG,
 						  IIO_EV_DIR_RISING),
 			       ts);
 }
@@ -689,7 +689,7 @@ static int mma8452_reg_access_dbg(struct iio_dev *indio_dev,
 
 static const struct iio_event_spec mma8452_transient_event[] = {
 	{
-		.type = IIO_EV_TYPE_THRESH,
+		.type = IIO_EV_TYPE_MAG,
 		.dir = IIO_EV_DIR_RISING,
 		.mask_separate = BIT(IIO_EV_INFO_ENABLE),
 		.mask_shared_by_type = BIT(IIO_EV_INFO_VALUE) |
@@ -700,7 +700,7 @@ static const struct iio_event_spec mma8452_transient_event[] = {
 
 static const struct iio_event_spec mma8452_motion_event[] = {
 	{
-		.type = IIO_EV_TYPE_THRESH,
+		.type = IIO_EV_TYPE_MAG,
 		.dir = IIO_EV_DIR_RISING,
 		.mask_separate = BIT(IIO_EV_INFO_ENABLE),
 		.mask_shared_by_type = BIT(IIO_EV_INFO_VALUE) |
-- 
2.1.4

[PATCH 8/8] iio: mma8452: leave sysfs namings to the iio core

[Martin Kepplinger]

This doesn't actually change anything since the core names the sysfs folder
for the iio event attributes "events" anyways. It only leaves the job to the
core.

Signed-off-by: Martin Kepplinger <martin.kepplinger-SN7IsUiht6C/RdPyistoZJqQE7yCjDx5@public.gmane.org>
Signed-off-by: Christoph Muellner <christoph.muellner-SN7IsUiht6C/RdPyistoZJqQE7yCjDx5@public.gmane.org>
---
 drivers/iio/accel/mma8452.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/iio/accel/mma8452.c b/drivers/iio/accel/mma8452.c
index e23ebd0..2491ed0 100644
--- a/drivers/iio/accel/mma8452.c
+++ b/drivers/iio/accel/mma8452.c
@@ -721,7 +721,6 @@ static struct attribute *mma8452_event_attributes[] = {
 
 static struct attribute_group mma8452_event_attribute_group = {
 	.attrs = mma8452_event_attributes,
-	.name = "events",
 };
 
 #define MMA8452_CHANNEL(axis, idx, bits) { \
-- 
2.1.4

Re: [PATCH v2 0/8] iio: mma8452: support more devices and improve driver

[Martin Kepplinger]

Am 2015-07-01 um 10:21 schrieb Martin Kepplinger:
> This is the 2nd version that adds support for motion interrupts and 3 more
> accelerometer chips, two of which use them because they don't support the
> until now included transient interrupt sources:
> 
> MMA8453Q, MMA8652FC and MMA8653FC; datasheets are in the commit messages.
> 
> The driver and module name remains the same, seperating it from the device
> names it now supports.
> 
> On top of this, there are minor documentation additions, and more notably,
> the change of the existing iio event type from IIO_EV_TYPE_THRESH to
> IIO_EV_TYPE_MAG since it's the magnitude of the threshold that is relevant
> for these devices, not a signed value.
> 
> Please review and test if you can. For MMA8452Q, other than the event type,
> nothing should have changed.
> 

Any wishes, suggestions, objections about this change?

thanks,
                           martin



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