[PATCH 5/5] max44000: Initial triggered buffer support

From: Crestez Dan Leonard
Date: Thu Apr 07 2016 - 12:22:50 EST


Signed-off-by: Crestez Dan Leonard <leonard.crestez@xxxxxxxxx>
---
drivers/iio/light/max44000.c | 63 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 63 insertions(+)

diff --git a/drivers/iio/light/max44000.c b/drivers/iio/light/max44000.c
index e479c53..7b1f8bc 100644
--- a/drivers/iio/light/max44000.c
+++ b/drivers/iio/light/max44000.c
@@ -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"
@@ -123,24 +126,41 @@ 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 = 8,
+ }
},
+ 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,
},
};

@@ -456,6 +476,42 @@ static int max44000_force_write_defaults(struct max44000_data *data)
return 0;
}

+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[indio_dev->scan_bytes / 2];
+ u8 *pos = (u8 *)buf;
+ unsigned int regval;
+ int ret;
+
+ mutex_lock(&data->lock);
+ if (*indio_dev->active_scan_mask & (1 << MAX44000_SCAN_INDEX_ALS)) {
+ ret = max44000_read_alsval(data);
+ if (ret < 0)
+ goto out_unlock;
+ *((u16 *)pos) = ret;
+ pos += 2;
+ }
+ if (*indio_dev->active_scan_mask & (1 << MAX44000_SCAN_INDEX_PRX)) {
+ ret = regmap_read(data->regmap, MAX44000_REG_PRX_DATA, &regval);
+ if (ret < 0)
+ goto out_unlock;
+ *pos = 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)
{
@@ -513,6 +569,12 @@ 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);
}

@@ -521,6 +583,7 @@ 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;
}

--
2.8.0.rc3