max44000: Initial triggered buffer support (06ad7ea1) · Commits · e / devices / android_kernel_teracube_2e

drivers/iio/light/max44000.c

+62 −0

Original line number	Diff line number	Diff line
		@@ -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;
		}