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leds: max77693: add support for V4L2 Flash sub-device 

Add support for V4L2 Flash sub-device to the max77693 LED Flash class
driver. The support allows for V4L2 Flash sub-device to take the control
of the LED Flash class device.

Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Bryan Wu <cooloney@gmail.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
hifive-unleashed-5.1
Jacek Anaszewski 2015-06-08 02:02:20 -07:00 committed by Bryan Wu
parent 42bd6f59ae
commit 0b380186a5
1 changed files with 123 additions and 6 deletions
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129
drivers/leds/leds-max77693.c
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@ -20,6 +20,7 @@
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <media/v4l2-flash-led-class.h>
#define MODE_OFF 0
#define MODE_FLASH(a) (1 << (a))
@ -62,6 +63,8 @@ struct max77693_sub_led {
struct led_classdev_flash fled_cdev;
/* assures led-triggers compatibility */
struct work_struct work_brightness_set;
/* V4L2 Flash device */
struct v4l2_flash *v4l2_flash;
/* brightness cache */
unsigned int torch_brightness;
@ -627,7 +630,8 @@ static int max77693_led_flash_timeout_set(
}
static int max77693_led_parse_dt(struct max77693_led_device *led,
struct max77693_led_config_data *cfg)
struct max77693_led_config_data *cfg,
struct device_node **sub_nodes)
{
struct device *dev = &led->pdev->dev;
struct max77693_sub_led *sub_leds = led->sub_leds;
@ -674,6 +678,13 @@ static int max77693_led_parse_dt(struct max77693_led_device *led,
return -EINVAL;
}
if (sub_nodes[fled_id]) {
dev_err(dev,
"Conflicting \"led-sources\" DT properties\n");
return -EINVAL;
}
sub_nodes[fled_id] = child_node;
sub_leds[fled_id].fled_id = fled_id;
cfg->label[fled_id] =
@ -786,11 +797,12 @@ static void max77693_led_validate_configuration(struct max77693_led_device *led,
}
static int max77693_led_get_configuration(struct max77693_led_device *led,
struct max77693_led_config_data *cfg)
struct max77693_led_config_data *cfg,
struct device_node **sub_nodes)
{
int ret;
ret = max77693_led_parse_dt(led, cfg);
ret = max77693_led_parse_dt(led, cfg, sub_nodes);
if (ret < 0)
return ret;
@ -838,6 +850,71 @@ static void max77693_init_flash_settings(struct max77693_sub_led *sub_led,
setting->val = setting->max;
}
#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
static int max77693_led_external_strobe_set(
struct v4l2_flash *v4l2_flash,
bool enable)
{
struct max77693_sub_led *sub_led =
flcdev_to_sub_led(v4l2_flash->fled_cdev);
struct max77693_led_device *led = sub_led_to_led(sub_led);
int fled_id = sub_led->fled_id;
int ret;
mutex_lock(&led->lock);
if (enable)
ret = max77693_add_mode(led, MODE_FLASH_EXTERNAL(fled_id));
else
ret = max77693_clear_mode(led, MODE_FLASH_EXTERNAL(fled_id));
mutex_unlock(&led->lock);
return ret;
}
static void max77693_init_v4l2_flash_config(struct max77693_sub_led *sub_led,
struct max77693_led_config_data *led_cfg,
struct v4l2_flash_config *v4l2_sd_cfg)
{
struct max77693_led_device *led = sub_led_to_led(sub_led);
struct device *dev = &led->pdev->dev;
struct max77693_dev *iodev = dev_get_drvdata(dev->parent);
struct i2c_client *i2c = iodev->i2c;
struct led_flash_setting *s;
snprintf(v4l2_sd_cfg->dev_name, sizeof(v4l2_sd_cfg->dev_name),
"%s %d-%04x", sub_led->fled_cdev.led_cdev.name,
i2c_adapter_id(i2c->adapter), i2c->addr);
s = &v4l2_sd_cfg->torch_intensity;
s->min = TORCH_IOUT_MIN;
s->max = sub_led->fled_cdev.led_cdev.max_brightness * TORCH_IOUT_STEP;
s->step = TORCH_IOUT_STEP;
s->val = s->max;
/* Init flash faults config */
v4l2_sd_cfg->flash_faults = LED_FAULT_OVER_VOLTAGE |
LED_FAULT_SHORT_CIRCUIT |
LED_FAULT_OVER_CURRENT;
v4l2_sd_cfg->has_external_strobe = true;
}
static const struct v4l2_flash_ops v4l2_flash_ops = {
.external_strobe_set = max77693_led_external_strobe_set,
};
#else
static inline void max77693_init_v4l2_flash_config(
struct max77693_sub_led *sub_led,
struct max77693_led_config_data *led_cfg,
struct v4l2_flash_config *v4l2_sd_cfg)
{
}
static const struct v4l2_flash_ops v4l2_flash_ops;
#endif
static void max77693_init_fled_cdev(struct max77693_sub_led *sub_led,
struct max77693_led_config_data *led_cfg)
{
@ -870,12 +947,45 @@ static void max77693_init_fled_cdev(struct max77693_sub_led *sub_led,
sub_led->flash_timeout = fled_cdev->timeout.val;
}
static int max77693_register_led(struct max77693_sub_led *sub_led,
struct max77693_led_config_data *led_cfg,
struct device_node *sub_node)
{
struct max77693_led_device *led = sub_led_to_led(sub_led);
struct led_classdev_flash *fled_cdev = &sub_led->fled_cdev;
struct device *dev = &led->pdev->dev;
struct v4l2_flash_config v4l2_sd_cfg = {};
int ret;
/* Register in the LED subsystem */
ret = led_classdev_flash_register(dev, fled_cdev);
if (ret < 0)
return ret;
max77693_init_v4l2_flash_config(sub_led, led_cfg, &v4l2_sd_cfg);
/* Register in the V4L2 subsystem. */
sub_led->v4l2_flash = v4l2_flash_init(dev, sub_node, fled_cdev, NULL,
&v4l2_flash_ops, &v4l2_sd_cfg);
if (IS_ERR(sub_led->v4l2_flash)) {
ret = PTR_ERR(sub_led->v4l2_flash);
goto err_v4l2_flash_init;
}
return 0;
err_v4l2_flash_init:
led_classdev_flash_unregister(fled_cdev);
return ret;
}
static int max77693_led_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct max77693_dev *iodev = dev_get_drvdata(dev->parent);
struct max77693_led_device *led;
struct max77693_sub_led *sub_leds;
struct device_node *sub_nodes[2] = {};
struct max77693_led_config_data led_cfg = {};
int init_fled_cdev[2], i, ret;
@ -889,7 +999,7 @@ static int max77693_led_probe(struct platform_device *pdev)
sub_leds = led->sub_leds;
platform_set_drvdata(pdev, led);
ret = max77693_led_get_configuration(led, &led_cfg);
ret = max77693_led_get_configuration(led, &led_cfg, sub_nodes);
if (ret < 0)
return ret;
@ -911,8 +1021,12 @@ static int max77693_led_probe(struct platform_device *pdev)
/* Initialize LED Flash class device */
max77693_init_fled_cdev(&sub_leds[i], &led_cfg);
/* Register LED Flash class device */
ret = led_classdev_flash_register(dev, &sub_leds[i].fled_cdev);
/*
* Register LED Flash class device and corresponding
* V4L2 Flash device.
*/
ret = max77693_register_led(&sub_leds[i], &led_cfg,
sub_nodes[i]);
if (ret < 0) {
/*
* At this moment FLED1 might have been already
@ -931,6 +1045,7 @@ err_register_led2:
/* It is possible than only FLED2 was to be registered */
if (!init_fled_cdev[FLED1])
goto err_register_led1;
v4l2_flash_release(sub_leds[FLED1].v4l2_flash);
led_classdev_flash_unregister(&sub_leds[FLED1].fled_cdev);
err_register_led1:
mutex_destroy(&led->lock);
@ -944,11 +1059,13 @@ static int max77693_led_remove(struct platform_device *pdev)
struct max77693_sub_led *sub_leds = led->sub_leds;
if (led->iout_joint || max77693_fled_used(led, FLED1)) {
v4l2_flash_release(sub_leds[FLED1].v4l2_flash);
led_classdev_flash_unregister(&sub_leds[FLED1].fled_cdev);
cancel_work_sync(&sub_leds[FLED1].work_brightness_set);
}
if (!led->iout_joint && max77693_fled_used(led, FLED2)) {
v4l2_flash_release(sub_leds[FLED2].v4l2_flash);
led_classdev_flash_unregister(&sub_leds[FLED2].fled_cdev);
cancel_work_sync(&sub_leds[FLED2].work_brightness_set);
}