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max44000: Initial triggered buffer support 

Signed-off-by: Crestez Dan Leonard <leonard.crestez@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
hifive-unleashed-5.1
Crestez Dan Leonard 2016-04-18 17:31:57 +03:00 committed by Jonathan Cameron
parent d5d8f49b63
commit 06ad7ea10e
1 changed files with 62 additions and 0 deletions
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62
drivers/iio/light/max44000.c
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@ -19,6 +19,9 @@
#include <linux/util_macros.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/buffer.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/acpi.h>
#define MAX44000_DRV_NAME "max44000"
@ -125,24 +128,41 @@ static const char max44000_scale_avail_str[] =
"0.5 "
"4";
#define MAX44000_SCAN_INDEX_ALS 0
#define MAX44000_SCAN_INDEX_PRX 1
static const struct iio_chan_spec max44000_channels[] = {
{
.type = IIO_LIGHT,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) |
BIT(IIO_CHAN_INFO_INT_TIME),
.scan_index = MAX44000_SCAN_INDEX_ALS,
.scan_type = {
.sign = 'u',
.realbits = 14,
.storagebits = 16,
}
},
{
.type = IIO_PROXIMITY,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
.scan_index = MAX44000_SCAN_INDEX_PRX,
.scan_type = {
.sign = 'u',
.realbits = 8,
.storagebits = 16,
}
},
IIO_CHAN_SOFT_TIMESTAMP(2),
{
.type = IIO_CURRENT,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_SCALE),
.extend_name = "led",
.output = 1,
.scan_index = -1,
},
};
@ -467,6 +487,41 @@ static const struct regmap_config max44000_regmap_config = {
.cache_type = REGCACHE_RBTREE,
};
static irqreturn_t max44000_trigger_handler(int irq, void *p)
{
struct iio_poll_func *pf = p;
struct iio_dev *indio_dev = pf->indio_dev;
struct max44000_data *data = iio_priv(indio_dev);
u16 buf[8]; /* 2x u16 + padding + 8 bytes timestamp */
int index = 0;
unsigned int regval;
int ret;
mutex_lock(&data->lock);
if (test_bit(MAX44000_SCAN_INDEX_ALS, indio_dev->active_scan_mask)) {
ret = max44000_read_alsval(data);
if (ret < 0)
goto out_unlock;
buf[index++] = ret;
}
if (test_bit(MAX44000_SCAN_INDEX_PRX, indio_dev->active_scan_mask)) {
ret = regmap_read(data->regmap, MAX44000_REG_PRX_DATA, &regval);
if (ret < 0)
goto out_unlock;
buf[index] = regval;
}
mutex_unlock(&data->lock);
iio_push_to_buffers_with_timestamp(indio_dev, buf, iio_get_time_ns());
iio_trigger_notify_done(indio_dev->trig);
return IRQ_HANDLED;
out_unlock:
mutex_unlock(&data->lock);
iio_trigger_notify_done(indio_dev->trig);
return IRQ_HANDLED;
}
static int max44000_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@ -534,6 +589,12 @@ static int max44000_probe(struct i2c_client *client,
return ret;
}
ret = iio_triggered_buffer_setup(indio_dev, NULL, max44000_trigger_handler, NULL);
if (ret < 0) {
dev_err(&client->dev, "iio triggered buffer setup failed\n");
return ret;
}
return iio_device_register(indio_dev);
}
@ -542,6 +603,7 @@ static int max44000_remove(struct i2c_client *client)
struct iio_dev *indio_dev = i2c_get_clientdata(client);
iio_device_unregister(indio_dev);
iio_triggered_buffer_cleanup(indio_dev);
return 0;
}