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-rw-r--r--drivers/iio/accel/mma8452.c160
1 files changed, 144 insertions, 16 deletions
diff --git a/drivers/iio/accel/mma8452.c b/drivers/iio/accel/mma8452.c
index ccc632a7cf01..77b71c2dfd72 100644
--- a/drivers/iio/accel/mma8452.c
+++ b/drivers/iio/accel/mma8452.c
@@ -15,7 +15,7 @@
*
* 7-bit I2C slave address 0x1c/0x1d (pin selectable)
*
- * TODO: orientation / freefall events, autosleep
+ * TODO: orientation events, autosleep
*/
#include <linux/module.h>
@@ -416,6 +416,51 @@ fail:
return ret;
}
+/* returns >0 if in freefall mode, 0 if not or <0 if an error occured */
+static int mma8452_freefall_mode_enabled(struct mma8452_data *data)
+{
+ int val;
+ const struct mma_chip_info *chip = data->chip_info;
+
+ val = i2c_smbus_read_byte_data(data->client, chip->ev_cfg);
+ if (val < 0)
+ return val;
+
+ return !(val & MMA8452_FF_MT_CFG_OAE);
+}
+
+static int mma8452_set_freefall_mode(struct mma8452_data *data, bool state)
+{
+ int val;
+ const struct mma_chip_info *chip = data->chip_info;
+
+ if ((state && mma8452_freefall_mode_enabled(data)) ||
+ (!state && !(mma8452_freefall_mode_enabled(data))))
+ return 0;
+
+ val = i2c_smbus_read_byte_data(data->client, chip->ev_cfg);
+ if (val < 0)
+ return val;
+
+ if (state) {
+ val |= BIT(idx_x + chip->ev_cfg_chan_shift);
+ val |= BIT(idx_y + chip->ev_cfg_chan_shift);
+ val |= BIT(idx_z + chip->ev_cfg_chan_shift);
+ val &= ~MMA8452_FF_MT_CFG_OAE;
+ } else {
+ val &= ~BIT(idx_x + chip->ev_cfg_chan_shift);
+ val &= ~BIT(idx_y + chip->ev_cfg_chan_shift);
+ val &= ~BIT(idx_z + chip->ev_cfg_chan_shift);
+ val |= MMA8452_FF_MT_CFG_OAE;
+ }
+
+ val = mma8452_change_config(data, chip->ev_cfg, val);
+ if (val)
+ return val;
+
+ return 0;
+}
+
static int mma8452_set_hp_filter_frequency(struct mma8452_data *data,
int val, int val2)
{
@@ -609,12 +654,22 @@ static int mma8452_read_event_config(struct iio_dev *indio_dev,
const struct mma_chip_info *chip = data->chip_info;
int ret;
- ret = i2c_smbus_read_byte_data(data->client,
- data->chip_info->ev_cfg);
- if (ret < 0)
- return ret;
+ switch (dir) {
+ case IIO_EV_DIR_FALLING:
+ return mma8452_freefall_mode_enabled(data);
+ case IIO_EV_DIR_RISING:
+ if (mma8452_freefall_mode_enabled(data))
+ return 0;
+
+ ret = i2c_smbus_read_byte_data(data->client,
+ data->chip_info->ev_cfg);
+ if (ret < 0)
+ return ret;
- return !!(ret & BIT(chan->scan_index + chip->ev_cfg_chan_shift));
+ return !!(ret & BIT(chan->scan_index + chip->ev_cfg_chan_shift));
+ default:
+ return -EINVAL;
+ }
}
static int mma8452_write_event_config(struct iio_dev *indio_dev,
@@ -627,19 +682,35 @@ static int mma8452_write_event_config(struct iio_dev *indio_dev,
const struct mma_chip_info *chip = data->chip_info;
int val;
- val = i2c_smbus_read_byte_data(data->client, chip->ev_cfg);
- if (val < 0)
- return val;
+ switch (dir) {
+ case IIO_EV_DIR_FALLING:
+ return mma8452_set_freefall_mode(data, state);
+ case IIO_EV_DIR_RISING:
+ val = i2c_smbus_read_byte_data(data->client, chip->ev_cfg);
+ if (val < 0)
+ return val;
+
+ if (state) {
+ if (mma8452_freefall_mode_enabled(data)) {
+ val &= ~BIT(idx_x + chip->ev_cfg_chan_shift);
+ val &= ~BIT(idx_y + chip->ev_cfg_chan_shift);
+ val &= ~BIT(idx_z + chip->ev_cfg_chan_shift);
+ val |= MMA8452_FF_MT_CFG_OAE;
+ }
+ val |= BIT(chan->scan_index + chip->ev_cfg_chan_shift);
+ } else {
+ if (mma8452_freefall_mode_enabled(data))
+ return 0;
- if (state)
- val |= BIT(chan->scan_index + chip->ev_cfg_chan_shift);
- else
- val &= ~BIT(chan->scan_index + chip->ev_cfg_chan_shift);
+ val &= ~BIT(chan->scan_index + chip->ev_cfg_chan_shift);
+ }
- val |= chip->ev_cfg_ele;
- val |= MMA8452_FF_MT_CFG_OAE;
+ val |= chip->ev_cfg_ele;
- return mma8452_change_config(data, chip->ev_cfg, val);
+ return mma8452_change_config(data, chip->ev_cfg, val);
+ default:
+ return -EINVAL;
+ }
}
static void mma8452_transient_interrupt(struct iio_dev *indio_dev)
@@ -652,6 +723,16 @@ static void mma8452_transient_interrupt(struct iio_dev *indio_dev)
if (src < 0)
return;
+ if (mma8452_freefall_mode_enabled(data)) {
+ iio_push_event(indio_dev,
+ IIO_MOD_EVENT_CODE(IIO_ACCEL, 0,
+ IIO_MOD_X_AND_Y_AND_Z,
+ IIO_EV_TYPE_MAG,
+ IIO_EV_DIR_FALLING),
+ ts);
+ return;
+ }
+
if (src & data->chip_info->ev_src_xe)
iio_push_event(indio_dev,
IIO_MOD_EVENT_CODE(IIO_ACCEL, 0, IIO_MOD_X,
@@ -745,6 +826,27 @@ static int mma8452_reg_access_dbg(struct iio_dev *indio_dev,
return 0;
}
+static const struct iio_event_spec mma8452_freefall_event[] = {
+ {
+ .type = IIO_EV_TYPE_MAG,
+ .dir = IIO_EV_DIR_FALLING,
+ .mask_separate = BIT(IIO_EV_INFO_ENABLE),
+ .mask_shared_by_type = BIT(IIO_EV_INFO_VALUE) |
+ BIT(IIO_EV_INFO_PERIOD) |
+ BIT(IIO_EV_INFO_HIGH_PASS_FILTER_3DB)
+ },
+};
+
+static const struct iio_event_spec mma8652_freefall_event[] = {
+ {
+ .type = IIO_EV_TYPE_MAG,
+ .dir = IIO_EV_DIR_FALLING,
+ .mask_separate = BIT(IIO_EV_INFO_ENABLE),
+ .mask_shared_by_type = BIT(IIO_EV_INFO_VALUE) |
+ BIT(IIO_EV_INFO_PERIOD)
+ },
+};
+
static const struct iio_event_spec mma8452_transient_event[] = {
{
.type = IIO_EV_TYPE_MAG,
@@ -781,6 +883,24 @@ static struct attribute_group mma8452_event_attribute_group = {
.attrs = mma8452_event_attributes,
};
+#define MMA8452_FREEFALL_CHANNEL(modifier) { \
+ .type = IIO_ACCEL, \
+ .modified = 1, \
+ .channel2 = modifier, \
+ .scan_index = -1, \
+ .event_spec = mma8452_freefall_event, \
+ .num_event_specs = ARRAY_SIZE(mma8452_freefall_event), \
+}
+
+#define MMA8652_FREEFALL_CHANNEL(modifier) { \
+ .type = IIO_ACCEL, \
+ .modified = 1, \
+ .channel2 = modifier, \
+ .scan_index = -1, \
+ .event_spec = mma8652_freefall_event, \
+ .num_event_specs = ARRAY_SIZE(mma8652_freefall_event), \
+}
+
#define MMA8452_CHANNEL(axis, idx, bits) { \
.type = IIO_ACCEL, \
.modified = 1, \
@@ -827,6 +947,7 @@ static const struct iio_chan_spec mma8452_channels[] = {
MMA8452_CHANNEL(Y, idx_y, 12),
MMA8452_CHANNEL(Z, idx_z, 12),
IIO_CHAN_SOFT_TIMESTAMP(idx_ts),
+ MMA8452_FREEFALL_CHANNEL(IIO_MOD_X_AND_Y_AND_Z),
};
static const struct iio_chan_spec mma8453_channels[] = {
@@ -834,6 +955,7 @@ static const struct iio_chan_spec mma8453_channels[] = {
MMA8452_CHANNEL(Y, idx_y, 10),
MMA8452_CHANNEL(Z, idx_z, 10),
IIO_CHAN_SOFT_TIMESTAMP(idx_ts),
+ MMA8452_FREEFALL_CHANNEL(IIO_MOD_X_AND_Y_AND_Z),
};
static const struct iio_chan_spec mma8652_channels[] = {
@@ -841,6 +963,7 @@ static const struct iio_chan_spec mma8652_channels[] = {
MMA8652_CHANNEL(Y, idx_y, 12),
MMA8652_CHANNEL(Z, idx_z, 12),
IIO_CHAN_SOFT_TIMESTAMP(idx_ts),
+ MMA8652_FREEFALL_CHANNEL(IIO_MOD_X_AND_Y_AND_Z),
};
static const struct iio_chan_spec mma8653_channels[] = {
@@ -848,6 +971,7 @@ static const struct iio_chan_spec mma8653_channels[] = {
MMA8652_CHANNEL(Y, idx_y, 10),
MMA8652_CHANNEL(Z, idx_z, 10),
IIO_CHAN_SOFT_TIMESTAMP(idx_ts),
+ MMA8652_FREEFALL_CHANNEL(IIO_MOD_X_AND_Y_AND_Z),
};
enum {
@@ -1190,6 +1314,10 @@ static int mma8452_probe(struct i2c_client *client,
if (ret < 0)
goto buffer_cleanup;
+ ret = mma8452_set_freefall_mode(data, false);
+ if (ret)
+ return ret;
+
return 0;
buffer_cleanup:
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-13 22:35:46 +0300