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iio: mma8452: Add support for interrupt driven triggers.

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Implement interrupt driven trigger for data ready.
This allows more efficient access to the sample data.

Signed-off-by: Martin Fuzzey <mfuzzey@parkeon.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Martin Fuzzey 2015-06-01 15:39:58 +02:00 committed by Jonathan Cameron
parent 1e79841a00
commit ae6d9ce056
1 changed files with 93 additions and 8 deletions
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101
drivers/iio/accel/mma8452.c
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@ -18,6 +18,8 @@
#include <linux/iio/sysfs.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/buffer.h>
#include <linux/iio/trigger.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/iio/events.h>
#include <linux/delay.h>
@ -66,6 +68,7 @@
#define MMA8452_DATA_CFG_FS_8G 2
#define MMA8452_DATA_CFG_HPF_MASK BIT(4)
#define MMA8452_INT_DRDY BIT(0)
#define MMA8452_INT_TRANS BIT(5)
#define MMA8452_DEVICE_ID 0x2a
@ -577,18 +580,24 @@ static irqreturn_t mma8452_interrupt(int irq, void *p)
{
struct iio_dev *indio_dev = p;
struct mma8452_data *data = iio_priv(indio_dev);
int ret = IRQ_NONE;
int src;
src = i2c_smbus_read_byte_data(data->client, MMA8452_INT_SRC);
if (src < 0)
return IRQ_NONE;
if (src & MMA8452_INT_TRANS) {
mma8452_transient_interrupt(indio_dev);
return IRQ_HANDLED;
if (src & MMA8452_INT_DRDY) {
iio_trigger_poll_chained(indio_dev->trig);
ret = IRQ_HANDLED;
}
return IRQ_NONE;
if (src & MMA8452_INT_TRANS) {
mma8452_transient_interrupt(indio_dev);
ret = IRQ_HANDLED;
}
return ret;
}
static irqreturn_t mma8452_trigger_handler(int irq, void *p)
@ -714,6 +723,72 @@ static const struct iio_info mma8452_info = {
static const unsigned long mma8452_scan_masks[] = {0x7, 0};
static int mma8452_data_rdy_trigger_set_state(struct iio_trigger *trig,
bool state)
{
struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
struct mma8452_data *data = iio_priv(indio_dev);
int reg;
reg = i2c_smbus_read_byte_data(data->client, MMA8452_CTRL_REG4);
if (reg < 0)
return reg;
if (state)
reg |= MMA8452_INT_DRDY;
else
reg &= ~MMA8452_INT_DRDY;
return mma8452_change_config(data, MMA8452_CTRL_REG4, reg);
}
static int mma8452_validate_device(struct iio_trigger *trig,
struct iio_dev *indio_dev)
{
struct iio_dev *indio = iio_trigger_get_drvdata(trig);
if (indio != indio_dev)
return -EINVAL;
return 0;
}
static const struct iio_trigger_ops mma8452_trigger_ops = {
.set_trigger_state = mma8452_data_rdy_trigger_set_state,
.validate_device = mma8452_validate_device,
.owner = THIS_MODULE,
};
static int mma8452_trigger_setup(struct iio_dev *indio_dev)
{
struct mma8452_data *data = iio_priv(indio_dev);
struct iio_trigger *trig;
int ret;
trig = devm_iio_trigger_alloc(&data->client->dev, "%s-dev%d",
indio_dev->name,
indio_dev->id);
if (!trig)
return -ENOMEM;
trig->dev.parent = &data->client->dev;
trig->ops = &mma8452_trigger_ops;
iio_trigger_set_drvdata(trig, indio_dev);
ret = iio_trigger_register(trig);
if (ret)
return ret;
indio_dev->trig = trig;
return 0;
}
static void mma8452_trigger_cleanup(struct iio_dev *indio_dev)
{
if (indio_dev->trig)
iio_trigger_unregister(indio_dev->trig);
}
static int mma8452_reset(struct i2c_client *client)
{
int i;
@ -794,7 +869,8 @@ static int mma8452_probe(struct i2c_client *client,
* enabled until userspace asks for it by
* mma8452_write_event_config()
*/
int supported_interrupts = MMA8452_INT_TRANS;
int supported_interrupts = MMA8452_INT_DRDY | MMA8452_INT_TRANS;
int enabled_interrupts = MMA8452_INT_TRANS;
/* Assume wired to INT1 pin */
ret = i2c_smbus_write_byte_data(client,
@ -805,7 +881,11 @@ static int mma8452_probe(struct i2c_client *client,
ret = i2c_smbus_write_byte_data(client,
MMA8452_CTRL_REG4,
supported_interrupts);
enabled_interrupts);
if (ret < 0)
return ret;
ret = mma8452_trigger_setup(indio_dev);
if (ret < 0)
return ret;
}
@ -815,12 +895,12 @@ static int mma8452_probe(struct i2c_client *client,
ret = i2c_smbus_write_byte_data(client, MMA8452_CTRL_REG1,
data->ctrl_reg1);
if (ret < 0)
return ret;
goto trigger_cleanup;
ret = iio_triggered_buffer_setup(indio_dev, NULL,
mma8452_trigger_handler, NULL);
if (ret < 0)
return ret;
goto trigger_cleanup;
if (client->irq) {
ret = devm_request_threaded_irq(&client->dev,
@ -840,6 +920,10 @@ static int mma8452_probe(struct i2c_client *client,
buffer_cleanup:
iio_triggered_buffer_cleanup(indio_dev);
trigger_cleanup:
mma8452_trigger_cleanup(indio_dev);
return ret;
}
@ -849,6 +933,7 @@ static int mma8452_remove(struct i2c_client *client)
iio_device_unregister(indio_dev);
iio_triggered_buffer_cleanup(indio_dev);
mma8452_trigger_cleanup(indio_dev);
mma8452_standby(iio_priv(indio_dev));
return 0;