Add support for V4L2 Flash sub-device to the aat1290 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@xxxxxxxxxxx>
Acked-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
Cc: Bryan Wu <cooloney@xxxxxxxxx>
Cc: Richard Purdie <rpurdie@xxxxxxxxx>
Cc: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
---
drivers/leds/leds-aat1290.c | 163 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 163 insertions(+)
diff --git a/drivers/leds/leds-aat1290.c b/drivers/leds/leds-aat1290.c
index b217f0a..0e32be7 100644
--- a/drivers/leds/leds-aat1290.c
+++ b/drivers/leds/leds-aat1290.c
@@ -20,6 +20,7 @@
#include <linux/of_gpio.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
+#include <media/v4l2-flash.h>
#include <linux/workqueue.h>
#define AAT1290_MOVIE_MODE_CURRENT_ADDR 17
@@ -46,6 +47,9 @@
#define AAT1290_MM_CURRENT_SCALE_SIZE 15
struct aat1290_led_settings {
+#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
+ struct led_flash_setting torch_brightness;
+#endif
struct led_flash_setting flash_timeout;
};
@@ -57,11 +61,19 @@ struct aat1290_led {
/* related LED Flash class device */
struct led_classdev_flash fled_cdev;
+ /* V4L2 Flash device */
+ struct v4l2_flash *v4l2_flash;
/* FLEN pin */
int flen_gpio;
/* EN|SET pin */
int en_set_gpio;
+#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
+ /* chooses flash strobe source - external or SoC gpio */
+ int ext_strobe_gpio;
+ /* movie mode current scale */
+ int *mm_current_scale;
+#endif
/* maximum flash timeout */
u32 max_flash_tm;
@@ -279,6 +291,15 @@ static void aat1290_init_flash_settings(struct aat1290_led *led,
{
struct led_flash_setting *setting;
+#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
+ /* Init flash intensity setting */
+ setting = &s->torch_brightness;
+ setting->min = led->mm_current_scale[0];
+ setting->max = led->mm_current_scale[AAT1290_MM_CURRENT_SCALE_SIZE - 1];
+ setting->step = 1;
+ setting->val = setting->max;
+#endif
+
/* Init flash timeout setting */
setting = &s->flash_timeout;
setting->min = led->max_flash_tm / AAT1290_FLASH_TM_NUM_LEVELS;
@@ -287,6 +308,97 @@ static void aat1290_init_flash_settings(struct aat1290_led *led,
setting->val = setting->max;
}
+#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
+enum led_brightness aat1290_intensity_to_brightness(
+ struct v4l2_flash *v4l2_flash,
+ s32 intensity)
+{
+ struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
+ struct aat1290_led *led = fled_cdev_to_led(fled_cdev);
+ int i;
+
+ for (i = AAT1290_MM_CURRENT_SCALE_SIZE - 1; i >= 0; --i)
+ if (intensity >= led->mm_current_scale[i])
+ return i + 1;
+
+ return 1;
+}
+
+s32 aat1290_brightness_to_intensity(struct v4l2_flash *v4l2_flash,
+ enum led_brightness brightness)
+{
+ struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
+ struct aat1290_led *led = fled_cdev_to_led(fled_cdev);
+
+ return led->mm_current_scale[brightness - 1];
+}
+
+static int aat1290_led_external_strobe_set(struct v4l2_flash *v4l2_flash,
+ bool enable)
+{
+ struct aat1290_led *led = fled_cdev_to_led(v4l2_flash->fled_cdev);
+
+ led->movie_mode = false;
+ gpio_set_value(led->flen_gpio, 0);
+ gpio_set_value(led->en_set_gpio, 0);
+ gpio_set_value(led->ext_strobe_gpio, enable);
+
+ return 0;
+}
+
+int init_mm_current_scale(struct aat1290_led *led)
+{
+ int max_mm_current_percent[] = { 20, 22, 25, 28, 32, 36, 40, 45, 50, 56,
+ 63, 71, 79, 89, 100 };
+ int i, max_mm_current = AAT1290_MAX_MM_CURRENT(led->max_flash_current);
+
+ led->mm_current_scale = devm_kzalloc(&led->pdev->dev,
+ sizeof(max_mm_current_percent),
+ GFP_KERNEL);
+ if (!led->mm_current_scale)
+ return -ENOMEM;
+
+ for (i = 0; i < AAT1290_MM_CURRENT_SCALE_SIZE; ++i)
+ led->mm_current_scale[i] = max_mm_current *
+ max_mm_current_percent[i] / 100;
+
+ return 0;
+}
+
+static void aat1290_init_v4l2_ctrl_config(struct aat1290_led *led,
+ struct aat1290_led_settings *s,
+ struct v4l2_flash_ctrl_config *config)
+{
+ struct led_flash_setting *setting;
+ struct v4l2_ctrl_config *c;
+
+ c = &config->intensity;
+ setting = &s->torch_brightness;
+ c->min = setting->min;
+ c->max = setting->max;
+ c->step = setting->step;
+ c->def = setting->val;
+
+ c = &config->flash_timeout;
+ setting = &s->flash_timeout;
+ c->min = setting->min;
+ c->max = setting->max;
+ c->step = setting->step;
+ c->def = setting->val;
+
+ config->has_external_strobe = gpio_is_valid(led->ext_strobe_gpio);
+}
+
+static const struct v4l2_flash_ops v4l2_flash_ops = {
+ .external_strobe_set = aat1290_led_external_strobe_set,
+ .intensity_to_led_brightness = aat1290_intensity_to_brightness,
+ .led_brightness_to_intensity = aat1290_brightness_to_intensity,
+};
+#else
+#define aat1290_init_v4l2_ctrl_config(led, s, config)
+#define init_mm_current_scale(led) (0)
+#endif
+
static const struct led_flash_ops flash_ops = {
.strobe_set = aat1290_led_flash_strobe_set,
.timeout_set = aat1290_led_flash_timeout_set,
@@ -299,6 +411,10 @@ static int aat1290_led_probe(struct platform_device *pdev)
struct aat1290_led *led;
struct led_classdev *led_cdev;
struct led_classdev_flash *fled_cdev;
+#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
+ struct v4l2_flash_ctrl_config v4l2_flash_config;
+ int ext_strobe_gpio;
+#endif
struct aat1290_led_settings settings;
int flen_gpio, enset_gpio, ret;
@@ -342,6 +458,21 @@ static int aat1290_led_probe(struct platform_device *pdev)
}
led->en_set_gpio = enset_gpio;
+#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
+ ext_strobe_gpio = of_get_gpio(dev_node, 2);
+ if (gpio_is_valid(ext_strobe_gpio)) {
+ ret = devm_gpio_request_one(dev, ext_strobe_gpio, GPIOF_DIR_OUT,
+ "aat1290_en_hw_strobe");
+ if (ret < 0) {
+ dev_err(dev,
+ "failed to request GPIO %d, error %d\n",
+ ext_strobe_gpio, ret);
+ return ret;
+ }
+ }
+ led->ext_strobe_gpio = ext_strobe_gpio;
+#endif
+
fled_cdev = &led->fled_cdev;
led_cdev = &fled_cdev->led_cdev;
@@ -349,9 +480,20 @@ static int aat1290_led_probe(struct platform_device *pdev)
if (ret < 0)
return ret;
+ /*
+ * Initialize non-linear movie mode current scale basing
+ * on the max flash current from Device Tree binding.
+ */
+ ret = init_mm_current_scale(led);
+ if (ret < 0)
+ return ret;
+
/* Init flash settings */
aat1290_init_flash_settings(led, &settings);
+ /* Init V4L2 Flash controls basing on initialized settings */
+ aat1290_init_v4l2_ctrl_config(led, &settings, &v4l2_flash_config);
+
fled_cdev->timeout = settings.flash_timeout;
fled_cdev->ops = &flash_ops;
@@ -370,13 +512,34 @@ static int aat1290_led_probe(struct platform_device *pdev)
mutex_init(&led->lock);
+ of_node_get(dev_node);
+ led_cdev->dev->of_node = dev_node;
+
+ /* Create V4L2 Flash subdev. */
+ led->v4l2_flash = v4l2_flash_init(fled_cdev,
+ &v4l2_flash_ops,
+ &v4l2_flash_config);
+ if (IS_ERR(led->v4l2_flash)) {
+ ret = PTR_ERR(led->v4l2_flash);
+ goto error_v4l2_flash_init;
+ }
+
return 0;
+
+error_v4l2_flash_init:
+ of_node_put(dev_node);
+ led_classdev_flash_unregister(fled_cdev);
+ mutex_destroy(&led->lock);
+
+ return ret;
}
static int aat1290_led_remove(struct platform_device *pdev)
{
struct aat1290_led *led = platform_get_drvdata(pdev);
+ v4l2_flash_release(led->v4l2_flash);
+ of_node_put(led->fled_cdev.led_cdev.dev->of_node);
led_classdev_flash_unregister(&led->fled_cdev);
cancel_work_sync(&led->work_brightness_set);
--
1.7.9.5
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