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