[PATCH/RFC v8 07/14] exynos4-is: Add support for v4l2-flash subdevs

Jacek Anaszewski
2014-11-28T09:20:10Z

This patch adds suppport for external v4l2-flash devices.
The support includes parsing "flashes" Device Tree property
and asynchronous subdevice registration.

Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Sylwester Nawrocki <s.nawrocki@samsung.com>
---
drivers/media/platform/exynos4-is/media-dev.c | 65 ++++++++++++++++++++++++-
drivers/media/platform/exynos4-is/media-dev.h | 13 ++++-
2 files changed, 75 insertions(+), 3 deletions(-)

diff --git a/drivers/media/platform/exynos4-is/media-dev.c b/drivers/media/platform/exynos4-is/media-dev.c
index f315ef9..8807730 100644
--- a/drivers/media/platform/exynos4-is/media-dev.c
+++ b/drivers/media/platform/exynos4-is/media-dev.c
@@ -451,6 +451,47 @@ rpm_put:
return ret;
}

+static bool match_subdev_name(struct v4l2_subdev *sd,
+ struct v4l2_async_subdev *asd)
+{
+ return !strcmp(sd->name, (char *) asd->match.custom.priv);
+}
+
+static int fimc_md_register_flash_entities(struct fimc_md *fmd)
+{
+ struct device_node *parent = fmd->pdev->dev.of_node;
+ const char *flash_names[FIMC_MAX_FLASHES];
+ int ret, i;
+
+ ret = of_property_count_strings(parent, "flashes");
+ if (ret < 0) {
+ /* the property may not exist - this is valid state */
+ if (ret == -EINVAL)
+ return 0;
+ v4l2_err(&fmd->v4l2_dev, "Failed to retrieve flashes\n");
+ return -EINVAL;
+ }
+
+ fmd->num_flashes = ret;
+
+ if (fmd->num_flashes > FIMC_MAX_FLASHES) {
+ v4l2_err(&fmd->v4l2_dev, "Too many flash leds declared.\n");
+ return -EINVAL;
+ }
+
+ of_property_read_string_array(parent, "flashes", flash_names,
+ fmd->num_flashes);
+
+ for (i = 0; i < fmd->num_flashes; ++i) {
+ fmd->flash[i].asd.match_type = V4L2_ASYNC_MATCH_CUSTOM;
+ fmd->flash[i].asd.match.custom.match = match_subdev_name;
+ fmd->flash[i].asd.match.custom.priv = (void *) flash_names[i];
+ fmd->async_subdevs[fmd->num_sensors + i] = &fmd->flash[i].asd;
+ }
+
+ return 0;
+}
+
static int __of_get_csis_id(struct device_node *np)
{
u32 reg = 0;
@@ -1275,6 +1316,18 @@ static int subdev_notifier_bound(struct v4l2_async_notifier *notifier,
struct fimc_sensor_info *si = NULL;
int i;

+ /* Register flash subdev if detected any */
+ for (i = 0; i < ARRAY_SIZE(fmd->flash); i++) {
+ if (!fmd->flash[i].asd.match.custom.priv)
+ continue;
+ if (!strcmp(fmd->flash[i].asd.match.custom.priv,
+ subdev->name)) {
+ fmd->flash[i].subdev = subdev;
+ fmd->num_flashes++;
+ return 0;
+ }
+ }
+
/* Find platform data for this sensor subdev */
for (i = 0; i < ARRAY_SIZE(fmd->sensor); i++)
if (fmd->sensor[i].asd.match.of.node == subdev->dev->of_node)
@@ -1385,6 +1438,12 @@ static int fimc_md_probe(struct platform_device *pdev)
goto err_m_ent;
}

+ ret = fimc_md_register_flash_entities(fmd);
+ if (ret < 0) {
+ mutex_unlock(&fmd->media_dev.graph_mutex);
+ goto err_m_ent;
+ }
+
mutex_unlock(&fmd->media_dev.graph_mutex);

ret = device_create_file(&pdev->dev, &dev_attr_subdev_conf_mode);
@@ -1401,12 +1460,14 @@ static int fimc_md_probe(struct platform_device *pdev)
goto err_attr;
}

- if (fmd->num_sensors > 0) {
+ if (fmd->num_sensors > 0 || fmd->num_flashes > 0) {
fmd->subdev_notifier.subdevs = fmd->async_subdevs;
- fmd->subdev_notifier.num_subdevs = fmd->num_sensors;
+ fmd->subdev_notifier.num_subdevs = fmd->num_sensors +
+ fmd->num_flashes;
fmd->subdev_notifier.bound = subdev_notifier_bound;
fmd->subdev_notifier.complete = subdev_notifier_complete;
fmd->num_sensors = 0;
+ fmd->num_flashes = 0;

ret = v4l2_async_notifier_register(&fmd->v4l2_dev,
&fmd->subdev_notifier);
diff --git a/drivers/media/platform/exynos4-is/media-dev.h b/drivers/media/platform/exynos4-is/media-dev.h
index 0321454..feff9c8 100644
--- a/drivers/media/platform/exynos4-is/media-dev.h
+++ b/drivers/media/platform/exynos4-is/media-dev.h
@@ -34,6 +34,8 @@

#define FIMC_MAX_SENSORS 4
#define FIMC_MAX_CAMCLKS 2
+#define FIMC_MAX_FLASHES 2
+#define FIMC_MAX_ASYNC_SUBDEVS (FIMC_MAX_SENSORS + FIMC_MAX_FLASHES)
#define DEFAULT_SENSOR_CLK_FREQ 24000000U

/* LCD/ISP Writeback clocks (PIXELASYNCMx) */
@@ -93,6 +95,11 @@ struct fimc_sensor_info {
struct fimc_dev *host;
};

+struct fimc_flash_info {
+ struct v4l2_subdev *subdev;
+ struct v4l2_async_subdev asd;
+};
+
struct cam_clk {
struct clk_hw hw;
struct fimc_md *fmd;
@@ -104,6 +111,8 @@ struct cam_clk {
* @csis: MIPI CSIS subdevs data
* @sensor: array of registered sensor subdevs
* @num_sensors: actual number of registered sensors
+ * @flash: array of registered flash subdevs
+ * @num_flashes: actual number of registered flashes
* @camclk: external sensor clock information
* @fimc: array of registered fimc devices
* @fimc_is: fimc-is data structure
@@ -123,6 +132,8 @@ struct fimc_md {
struct fimc_csis_info csis[CSIS_MAX_ENTITIES];
struct fimc_sensor_info sensor[FIMC_MAX_SENSORS];
int num_sensors;
+ struct fimc_flash_info flash[FIMC_MAX_FLASHES];
+ int num_flashes;
struct fimc_camclk_info camclk[FIMC_MAX_CAMCLKS];
struct clk *wbclk[FIMC_MAX_WBCLKS];
struct fimc_lite *fimc_lite[FIMC_LITE_MAX_DEVS];
@@ -149,7 +160,7 @@ struct fimc_md {
} clk_provider;

struct v4l2_async_notifier subdev_notifier;
- struct v4l2_async_subdev *async_subdevs[FIMC_MAX_SENSORS];
+ struct v4l2_async_subdev *async_subdevs[FIMC_MAX_ASYNC_SUBDEVS];

bool user_subdev_api;
spinlock_t slock;
--
1.7.9.5