This patch adds helper functions for registering/unregistering
LED class flash devices as V4L2 subdevs. The functions should
be called from the LED subsystem device driver. In case the
support for V4L2 Flash sub-devices is disabled in the kernel
config the functions' empty versions will be used.
Signed-off-by: Jacek Anaszewski <j.anaszewski@xxxxxxxxxxx>
Acked-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
Cc: Sakari Ailus <sakari.ailus@xxxxxx>
Cc: Hans Verkuil <hans.verkuil@xxxxxxxxx>
---
drivers/media/v4l2-core/Kconfig | 11 +
drivers/media/v4l2-core/Makefile | 2 +
drivers/media/v4l2-core/v4l2-flash.c | 580 ++++++++++++++++++++++++++++++++++
include/media/v4l2-flash.h | 137 ++++++++
4 files changed, 730 insertions(+)
create mode 100644 drivers/media/v4l2-core/v4l2-flash.c
create mode 100644 include/media/v4l2-flash.h
diff --git a/drivers/media/v4l2-core/Kconfig b/drivers/media/v4l2-core/Kconfig
index 9ca0f8d..3ae3f0f 100644
--- a/drivers/media/v4l2-core/Kconfig
+++ b/drivers/media/v4l2-core/Kconfig
@@ -35,6 +35,17 @@ config V4L2_MEM2MEM_DEV
tristate
depends on VIDEOBUF2_CORE
+# Used by LED subsystem flash drivers
+config V4L2_FLASH_LED_CLASS
+ bool "Enable support for Flash sub-devices"
+ depends on VIDEO_V4L2_SUBDEV_API
+ depends on LEDS_CLASS_FLASH
+ ---help---
+ Say Y here to enable support for Flash sub-devices, which allow
+ to control LED class devices with use of V4L2 Flash controls.
+
+ When in doubt, say N.
+
# Used by drivers that need Videobuf modules
config VIDEOBUF_GEN
tristate
diff --git a/drivers/media/v4l2-core/Makefile b/drivers/media/v4l2-core/Makefile
index 63d29f2..44e858c 100644
--- a/drivers/media/v4l2-core/Makefile
+++ b/drivers/media/v4l2-core/Makefile
@@ -22,6 +22,8 @@ obj-$(CONFIG_VIDEO_TUNER) += tuner.o
obj-$(CONFIG_V4L2_MEM2MEM_DEV) += v4l2-mem2mem.o
+obj-$(CONFIG_V4L2_FLASH_LED_CLASS) += v4l2-flash.o
+
obj-$(CONFIG_VIDEOBUF_GEN) += videobuf-core.o
obj-$(CONFIG_VIDEOBUF_DMA_SG) += videobuf-dma-sg.o
obj-$(CONFIG_VIDEOBUF_DMA_CONTIG) += videobuf-dma-contig.o
diff --git a/drivers/media/v4l2-core/v4l2-flash.c b/drivers/media/v4l2-core/v4l2-flash.c
new file mode 100644
index 0000000..21080c6
--- /dev/null
+++ b/drivers/media/v4l2-core/v4l2-flash.c
@@ -0,0 +1,580 @@
+/*
+ * V4L2 Flash LED sub-device registration helpers.
+ *
+ * Copyright (C) 2014 Samsung Electronics Co., Ltd
+ * Author: Jacek Anaszewski <j.anaszewski@xxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation."
+ */
+
+#include <linux/led-class-flash.h>
+#include <linux/mutex.h>
+#include <linux/of_led_flash_manager.h>
+#include <linux/slab.h>
+#include <media/v4l2-flash.h>
+
+#define call_flash_op(v4l2_flash, op, args...) \
+ (v4l2_flash->ops->op ? \
+ v4l2_flash->ops->op(args) : \
+ -EINVAL)
+
+static struct v4l2_device *v4l2_dev;
+static int registered_flashes;
+
+static inline enum led_brightness v4l2_flash_intensity_to_led_brightness(
+ struct v4l2_ctrl_config *config,
+ s32 intensity)
+{
+ return ((intensity - config->min) / config->step) + 1;
+}
+
+static inline s32 v4l2_flash_led_brightness_to_intensity(
+ struct v4l2_ctrl_config *config,
+ enum led_brightness brightness)
+{
+ return ((brightness - 1) * config->step) + config->min;
+}
+
+static int v4l2_flash_g_volatile_ctrl(struct v4l2_ctrl *c)
+
+{
+ struct v4l2_flash *v4l2_flash = v4l2_ctrl_to_v4l2_flash(c);
+ struct led_classdev_flash *flash = v4l2_flash->flash;
+ struct led_classdev *led_cdev = &flash->led_cdev;
+ struct v4l2_flash_ctrl_config *config = &v4l2_flash->config;
+ struct v4l2_flash_ctrl *ctrl = &v4l2_flash->ctrl;
+ bool is_strobing;
+ int ret;
+
+ switch (c->id) {
+ case V4L2_CID_FLASH_TORCH_INTENSITY:
+ /*
+ * Update torch brightness only if in TORCH_MODE,
+ * as otherwise brightness_update op returns 0,
+ * which would spuriously inform user space that
+ * V4L2_CID_FLASH_TORCH_INTENSITY control value
+ * has changed.
+ */
+ if (ctrl->led_mode->val == V4L2_FLASH_LED_MODE_TORCH) {
+ ret = call_flash_op(v4l2_flash, torch_brightness_update,
+ led_cdev);
+ if (ret < 0)
+ return ret;
+ ctrl->torch_intensity->val =
+ v4l2_flash_led_brightness_to_intensity(
+ &config->torch_intensity,
+ led_cdev->brightness);
+ }
+ return 0;
+ case V4L2_CID_FLASH_INTENSITY:
+ ret = call_flash_op(v4l2_flash, flash_brightness_update,
+ flash);
+ if (ret < 0)
+ return ret;
+ /* no conversion is needed */
+ c->val = flash->brightness.val;
+ return 0;
+ case V4L2_CID_FLASH_INDICATOR_INTENSITY:
+ ret = call_flash_op(v4l2_flash, indicator_brightness_update,
+ flash);
+ if (ret < 0)
+ return ret;
+ /* no conversion is needed */
+ c->val = flash->indicator_brightness->val;
+ return 0;
+ case V4L2_CID_FLASH_STROBE_STATUS:
+ ret = call_flash_op(v4l2_flash, strobe_get, flash,
+ &is_strobing);
+ if (ret < 0)
+ return ret;
+ c->val = is_strobing;
+ return 0;
+ case V4L2_CID_FLASH_FAULT:
+ /* led faults map directly to V4L2 flash faults */
+ ret = call_flash_op(v4l2_flash, fault_get, flash, &c->val);
+ return ret;
+ case V4L2_CID_FLASH_STROBE_SOURCE:
+ c->val = flash->external_strobe;
+ return 0;
+ case V4L2_CID_FLASH_STROBE_PROVIDER:
+ c->val = flash->strobe_provider_id;
+ return 0;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int v4l2_flash_s_ctrl(struct v4l2_ctrl *c)
+{
+ struct v4l2_flash *v4l2_flash = v4l2_ctrl_to_v4l2_flash(c);
+ struct led_classdev_flash *flash = v4l2_flash->flash;
+ struct v4l2_flash_ctrl *ctrl = &v4l2_flash->ctrl;
+ struct v4l2_flash_ctrl_config *config = &v4l2_flash->config;
+ enum led_brightness torch_brightness;
+ bool external_strobe;
+ int ret;
+
+ switch (c->id) {
+ case V4L2_CID_FLASH_LED_MODE:
+ switch (c->val) {
+ case V4L2_FLASH_LED_MODE_NONE:
+ call_flash_op(v4l2_flash, torch_brightness_set,
+ &flash->led_cdev, 0);
+ return call_flash_op(v4l2_flash, strobe_set, flash,
+ false);
+ case V4L2_FLASH_LED_MODE_FLASH:
+ /* Turn off torch LED */
+ call_flash_op(v4l2_flash, torch_brightness_set,
+ &flash->led_cdev, 0);
+ external_strobe = (ctrl->source->val ==
+ V4L2_FLASH_STROBE_SOURCE_EXTERNAL);
+ return call_flash_op(v4l2_flash, external_strobe_set,
+ flash, external_strobe);
+ case V4L2_FLASH_LED_MODE_TORCH:
+ /* Stop flash strobing */
+ ret = call_flash_op(v4l2_flash, strobe_set, flash,
+ false);
+ if (ret)
+ return ret;
+
+ torch_brightness =
+ v4l2_flash_intensity_to_led_brightness(
+ &config->torch_intensity,
+ ctrl->torch_intensity->val);
+ call_flash_op(v4l2_flash, torch_brightness_set,
+ &flash->led_cdev, torch_brightness);
+ return ret;
+ }
+ break;
+ case V4L2_CID_FLASH_STROBE_SOURCE:
+ external_strobe = (c->val == V4L2_FLASH_STROBE_SOURCE_EXTERNAL);
+
+ return call_flash_op(v4l2_flash, external_strobe_set, flash,
+ external_strobe);
+ case V4L2_CID_FLASH_STROBE:
+ if (ctrl->led_mode->val != V4L2_FLASH_LED_MODE_FLASH ||
+ ctrl->source->val != V4L2_FLASH_STROBE_SOURCE_SOFTWARE)
+ return -EINVAL;
+ return call_flash_op(v4l2_flash, strobe_set, flash, true);
+ case V4L2_CID_FLASH_STROBE_STOP:
+ return call_flash_op(v4l2_flash, strobe_set, flash, false);
+ case V4L2_CID_FLASH_TIMEOUT:
+ return call_flash_op(v4l2_flash, timeout_set, flash, c->val);
+ case V4L2_CID_FLASH_INTENSITY:
+ /* no conversion is needed */
+ return call_flash_op(v4l2_flash, flash_brightness_set, flash,
+ c->val);
+ case V4L2_CID_FLASH_INDICATOR_INTENSITY:
+ /* no conversion is needed */
+ return call_flash_op(v4l2_flash, indicator_brightness_set,
+ flash, c->val);
+ case V4L2_CID_FLASH_TORCH_INTENSITY:
+ /*
+ * If not in MODE_TORCH don't call led-class brightness_set
+ * op, as it would result in turning the torch led on.
+ * Instead the value is cached only and will be written
+ * to the device upon transition to MODE_TORCH.
+ */
+ if (ctrl->led_mode->val == V4L2_FLASH_LED_MODE_TORCH) {
+ torch_brightness =
+ v4l2_flash_intensity_to_led_brightness(
+ &config->torch_intensity,
+ ctrl->torch_intensity->val);
+ call_flash_op(v4l2_flash, torch_brightness_set,
+ &flash->led_cdev, torch_brightness);
+ }
+ return 0;
+ case V4L2_CID_FLASH_STROBE_PROVIDER:
+ flash->strobe_provider_id = c->val;
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+static const struct v4l2_ctrl_ops v4l2_flash_ctrl_ops = {
+ .g_volatile_ctrl = v4l2_flash_g_volatile_ctrl,
+ .s_ctrl = v4l2_flash_s_ctrl,
+};
+
+static int v4l2_flash_init_strobe_providers_menu(struct v4l2_flash *v4l2_flash)
+{
+ struct led_classdev_flash *flash = v4l2_flash->flash;
+ struct led_flash_strobe_provider *provider;
+ struct v4l2_ctrl *ctrl;
+ int i = 0;
+
+ v4l2_flash->strobe_providers_menu =
+ kzalloc(sizeof(char *) * (flash->num_strobe_providers),
+ GFP_KERNEL);
+ if (!v4l2_flash->strobe_providers_menu)
+ return -ENOMEM;
+
+ list_for_each_entry(provider, &flash->strobe_providers, list)
+ v4l2_flash->strobe_providers_menu[i++] =
+ (char *) provider->name;
+
+ ctrl = v4l2_ctrl_new_std_menu_items(
+ &v4l2_flash->hdl, &v4l2_flash_ctrl_ops,
+ V4L2_CID_FLASH_STROBE_PROVIDER,
+ flash->num_strobe_providers - 1,
+ 0, 0,
+ (const char * const *) v4l2_flash->strobe_providers_menu);
+
+ if (ctrl)
+ ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
+
+ return 0;
+}
+
+static int v4l2_flash_init_controls(struct v4l2_flash *v4l2_flash)
+
+{
+ struct led_classdev_flash *flash = v4l2_flash->flash;
+ const struct led_flash_ops *flash_ops = flash->ops;
+ struct led_classdev *led_cdev = &flash->led_cdev;
+ struct v4l2_flash_ctrl_config *config = &v4l2_flash->config;
+ struct v4l2_ctrl *ctrl;
+ struct v4l2_ctrl_config *ctrl_cfg;
+ bool has_flash = led_cdev->flags & LED_DEV_CAP_FLASH;
+ bool has_indicator = led_cdev->flags & LED_DEV_CAP_INDICATOR;
+ bool has_strobe_providers = (flash->num_strobe_providers > 1);
+ unsigned int mask;
+ int ret, max, num_ctrls;
+
+ num_ctrls = has_flash ? 5 : 2;
+ if (has_flash) {
+ if (flash_ops->flash_brightness_set)
+ ++num_ctrls;
+ if (flash_ops->timeout_set)
+ ++num_ctrls;
+ if (flash_ops->strobe_get)
+ ++num_ctrls;
+ if (has_indicator)
+ ++num_ctrls;
+ if (config->flash_faults)
+ ++num_ctrls;
+ if (has_strobe_providers)
+ ++num_ctrls;
+ }
+
+ v4l2_ctrl_handler_init(&v4l2_flash->hdl, num_ctrls);
+
+ mask = 1 << V4L2_FLASH_LED_MODE_NONE |
+ 1 << V4L2_FLASH_LED_MODE_TORCH;
+ if (flash)
+ mask |= 1 << V4L2_FLASH_LED_MODE_FLASH;
+
+ /* Configure FLASH_LED_MODE ctrl */
+ v4l2_flash->ctrl.led_mode = v4l2_ctrl_new_std_menu(
+ &v4l2_flash->hdl,
+ &v4l2_flash_ctrl_ops, V4L2_CID_FLASH_LED_MODE,
+ V4L2_FLASH_LED_MODE_TORCH, ~mask,
+ V4L2_FLASH_LED_MODE_NONE);
+
+ /* Configure TORCH_INTENSITY ctrl */
+ ctrl_cfg = &config->torch_intensity;
+ ctrl = v4l2_ctrl_new_std(&v4l2_flash->hdl, &v4l2_flash_ctrl_ops,
+ V4L2_CID_FLASH_TORCH_INTENSITY,
+ ctrl_cfg->min, ctrl_cfg->max,
+ ctrl_cfg->step, ctrl_cfg->def);
+ if (ctrl)
+ ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
+ v4l2_flash->ctrl.torch_intensity = ctrl;
+
+ if (has_flash) {
+ /* Configure FLASH_STROBE_SOURCE ctrl */
+ mask = 1 << V4L2_FLASH_STROBE_SOURCE_SOFTWARE;
+
+ if (flash->has_external_strobe) {
+ mask |= 1 << V4L2_FLASH_STROBE_SOURCE_EXTERNAL;
+ max = V4L2_FLASH_STROBE_SOURCE_EXTERNAL;
+ } else {
+ max = V4L2_FLASH_STROBE_SOURCE_SOFTWARE;
+ }
+
+ v4l2_flash->ctrl.source = v4l2_ctrl_new_std_menu(
+ &v4l2_flash->hdl,
+ &v4l2_flash_ctrl_ops,
+ V4L2_CID_FLASH_STROBE_SOURCE,
+ max,
+ ~mask,
+ V4L2_FLASH_STROBE_SOURCE_SOFTWARE);
+ if (v4l2_flash->ctrl.source)
+ v4l2_flash->ctrl.source->flags |=
+ V4L2_CTRL_FLAG_VOLATILE;
+
+ /* Configure FLASH_STROBE ctrl */
+ ctrl = v4l2_ctrl_new_std(&v4l2_flash->hdl, &v4l2_flash_ctrl_ops,
+ V4L2_CID_FLASH_STROBE, 0, 1, 1, 0);
+
+ /* Configure FLASH_STROBE_STOP ctrl */
+ ctrl = v4l2_ctrl_new_std(&v4l2_flash->hdl, &v4l2_flash_ctrl_ops,
+ V4L2_CID_FLASH_STROBE_STOP,
+ 0, 1, 1, 0);
+
+ /* Configure FLASH_STROBE_STATUS ctrl */
+ ctrl = v4l2_ctrl_new_std(&v4l2_flash->hdl, &v4l2_flash_ctrl_ops,
+ V4L2_CID_FLASH_STROBE_STATUS,
+ 0, 1, 1, 1);
+
+ if (flash_ops->strobe_get)
+ if (ctrl)
+ ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE |
+ V4L2_CTRL_FLAG_READ_ONLY;
+
+ if (flash_ops->timeout_set) {
+ /* Configure FLASH_TIMEOUT ctrl */
+ ctrl_cfg = &config->flash_timeout;
+ ctrl = v4l2_ctrl_new_std(
+ &v4l2_flash->hdl, &v4l2_flash_ctrl_ops,
+ V4L2_CID_FLASH_TIMEOUT, ctrl_cfg->min,
+ ctrl_cfg->max, ctrl_cfg->step,
+ ctrl_cfg->def);
+ if (ctrl)
+ ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
+ }
+
+ if (flash_ops->flash_brightness_set) {
+ /* Configure FLASH_INTENSITY ctrl */
+ ctrl_cfg = &config->flash_intensity;
+ ctrl = v4l2_ctrl_new_std(
+ &v4l2_flash->hdl,
+ &v4l2_flash_ctrl_ops,
+ V4L2_CID_FLASH_INTENSITY,
+ ctrl_cfg->min, ctrl_cfg->max,
+ ctrl_cfg->step, ctrl_cfg->def);
+ if (ctrl)
+ ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
+ }
+
+ if (config->flash_faults) {
+ /* Configure FLASH_FAULT ctrl */
+ ctrl = v4l2_ctrl_new_std(&v4l2_flash->hdl,
+ &v4l2_flash_ctrl_ops,
+ V4L2_CID_FLASH_FAULT, 0,
+ config->flash_faults,
+ 0, 0);
+ if (ctrl)
+ ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE |
+ V4L2_CTRL_FLAG_READ_ONLY;
+ }
+ if (has_indicator) {
+ /* Configure FLASH_INDICATOR_INTENSITY ctrl */
+ ctrl_cfg = &config->indicator_intensity;
+ ctrl = v4l2_ctrl_new_std(
+ &v4l2_flash->hdl, &v4l2_flash_ctrl_ops,
+ V4L2_CID_FLASH_INDICATOR_INTENSITY,
+ ctrl_cfg->min, ctrl_cfg->max,
+ ctrl_cfg->step, ctrl_cfg->def);
+ if (ctrl)
+ ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
+ }
+
+ if (has_strobe_providers) {
+ /* Configure V4L2_CID_FLASH_STROBE_PROVIDERS ctrl */
+ ret = v4l2_flash_init_strobe_providers_menu(v4l2_flash);
+ if (ret < 0)
+ goto error_free_handler;
+ }
+ }
+
+ if (v4l2_flash->hdl.error) {
+ ret = v4l2_flash->hdl.error;
+ goto error_free_handler;
+ }
+
+ ret = v4l2_ctrl_handler_setup(&v4l2_flash->hdl);
+ if (ret < 0)
+ goto error_free_handler;
+
+ v4l2_flash->sd.ctrl_handler = &v4l2_flash->hdl;
+
+ return 0;
+
+error_free_handler:
+ v4l2_ctrl_handler_free(&v4l2_flash->hdl);
+ return ret;
+}
+
+/*
+ * V4L2 subdev internal operations
+ */
+
+static int v4l2_flash_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
+{
+ struct v4l2_flash *v4l2_flash = v4l2_subdev_to_v4l2_flash(sd);
+ struct led_classdev_flash *flash = v4l2_flash->flash;
+ struct led_classdev *led_cdev = &flash->led_cdev;
+
+ mutex_lock(&led_cdev->led_lock);
+ call_flash_op(v4l2_flash, sysfs_lock, led_cdev);
+ mutex_unlock(&led_cdev->led_lock);
+
+ return 0;
+}
+
+static int v4l2_flash_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
+{
+ struct v4l2_flash *v4l2_flash = v4l2_subdev_to_v4l2_flash(sd);
+ struct led_classdev_flash *flash = v4l2_flash->flash;
+ struct led_classdev *led_cdev = &flash->led_cdev;
+
+ mutex_lock(&led_cdev->led_lock);
+ call_flash_op(v4l2_flash, sysfs_unlock, led_cdev);
+ mutex_unlock(&led_cdev->led_lock);
+
+ return 0;
+}
+
+int v4l2_flash_register(struct v4l2_flash *v4l2_flash)
+{
+ struct led_classdev_flash *flash = v4l2_flash->flash;
+ struct led_classdev *led_cdev = &flash->led_cdev;
+ int ret;
+
+ if (!v4l2_dev) {
+ v4l2_dev = kzalloc(sizeof(*v4l2_dev), GFP_KERNEL);
+ if (!v4l2_dev)
+ return -ENOMEM;
+
+ strlcpy(v4l2_dev->name, "v4l2-flash-manager",
+ sizeof(v4l2_dev->name));
+ ret = v4l2_device_register(NULL, v4l2_dev);
+ if (ret < 0) {
+ dev_err(led_cdev->dev->parent,
+ "Failed to register v4l2_device: %d\n", ret);
+ goto err_v4l2_device_register;
+ }
+ }
+
+ ret = v4l2_device_register_subdev(v4l2_dev, &v4l2_flash->sd);
+ if (ret < 0) {
+ dev_err(led_cdev->dev->parent,
+ "Failed to register v4l2_subdev: %d\n", ret);
+ goto err_v4l2_device_register;
+ }
+
+ ret = v4l2_device_register_subdev_node(&v4l2_flash->sd, v4l2_dev);
+ if (ret < 0) {
+ dev_err(led_cdev->dev->parent,
+ "Failed to register v4l2_subdev node: %d\n", ret);
+ goto err_register_subdev_node;
+ }
+
+ ++registered_flashes;
+
+ return 0;
+
+err_register_subdev_node:
+ v4l2_device_unregister_subdev(&v4l2_flash->sd);
+err_v4l2_device_register:
+ kfree(v4l2_flash->strobe_providers_menu);
+ if (v4l2_dev && registered_flashes == 0) {
+ v4l2_device_unregister(v4l2_dev);
+ kfree(v4l2_dev);
+ v4l2_dev = NULL;
+ }
+
+ return ret;
+}
+
+static void v4l2_flash_unregister(struct v4l2_flash *v4l2_flash)
+{
+ if (registered_flashes == 0)
+ return;
+
+ v4l2_device_unregister_subdev(&v4l2_flash->sd);
+
+ --registered_flashes;
+
+ if (registered_flashes == 0) {
+ v4l2_device_unregister(v4l2_dev);
+ kfree(v4l2_dev);
+ v4l2_dev = NULL;
+ }
+}
+
+static const struct v4l2_subdev_internal_ops v4l2_flash_subdev_internal_ops = {
+ .open = v4l2_flash_open,
+ .close = v4l2_flash_close,
+};
+
+static const struct v4l2_subdev_core_ops v4l2_flash_core_ops = {
+ .queryctrl = v4l2_subdev_queryctrl,
+ .querymenu = v4l2_subdev_querymenu,
+};
+
+static const struct v4l2_subdev_ops v4l2_flash_subdev_ops = {
+ .core = &v4l2_flash_core_ops,
+};
+
+int v4l2_flash_init(struct led_classdev_flash *flash,
+ struct v4l2_flash_ctrl_config *config,
+ const struct v4l2_flash_ops *flash_ops,
+ struct v4l2_flash **out_flash)
+{
+ struct v4l2_flash *v4l2_flash;
+ struct led_classdev *led_cdev = &flash->led_cdev;
+ struct v4l2_subdev *sd;
+ int ret;
+
+ if (!flash || !config || !out_flash)
+ return -EINVAL;
+
+ v4l2_flash = kzalloc(sizeof(*v4l2_flash), GFP_KERNEL);
+ if (!v4l2_flash)
+ return -ENOMEM;
+
+ sd = &v4l2_flash->sd;
+ v4l2_flash->flash = flash;
+ v4l2_flash->ops = flash_ops;
+ sd->dev = led_cdev->dev->parent;
+ v4l2_subdev_init(sd, &v4l2_flash_subdev_ops);
+ sd->internal_ops = &v4l2_flash_subdev_internal_ops;
+ sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+ snprintf(sd->name, sizeof(sd->name), led_cdev->name);
+
+ v4l2_flash->config = *config;
+ ret = v4l2_flash_init_controls(v4l2_flash);
+ if (ret < 0)
+ goto err_init_controls;
+
+ ret = media_entity_init(&sd->entity, 0, NULL, 0);
+ if (ret < 0)
+ goto err_init_entity;
+
+ sd->entity.type = MEDIA_ENT_T_V4L2_SUBDEV_FLASH;
+
+ ret = v4l2_flash_register(v4l2_flash);
+ if (ret < 0)
+ goto err_init_entity;
+
+ *out_flash = v4l2_flash;
+
+ return 0;
+
+err_init_entity:
+ media_entity_cleanup(&sd->entity);
+err_init_controls:
+ v4l2_ctrl_handler_free(sd->ctrl_handler);
+ kfree(v4l2_flash);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(v4l2_flash_init);
+
+void v4l2_flash_release(struct v4l2_flash *v4l2_flash)
+{
+ if (!v4l2_flash)
+ return;
+
+ v4l2_flash_unregister(v4l2_flash);
+ v4l2_ctrl_handler_free(v4l2_flash->sd.ctrl_handler);
+ media_entity_cleanup(&v4l2_flash->sd.entity);
+ kfree(v4l2_flash->strobe_providers_menu);
+ kfree(v4l2_flash);
+}
+EXPORT_SYMBOL_GPL(v4l2_flash_release);
diff --git a/include/media/v4l2-flash.h b/include/media/v4l2-flash.h
new file mode 100644
index 0000000..effa46b
--- /dev/null
+++ b/include/media/v4l2-flash.h
@@ -0,0 +1,137 @@
+/*
+ * V4L2 Flash LED sub-device registration helpers.
+ *
+ * Copyright (C) 2014 Samsung Electronics Co., Ltd
+ * Author: Jacek Anaszewski <j.anaszewski@xxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation."
+ */
+
+#ifndef _V4L2_FLASH_H
+#define _V4L2_FLASH_H
+
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-dev.h>
+#include <media/v4l2-event.h>
+#include <media/v4l2-ioctl.h>
+
+struct led_classdev_flash;
+struct led_classdev;
+enum led_brightness;
+
+struct v4l2_flash_ops {
+ int (*torch_brightness_set)(struct led_classdev *led_cdev,
+ enum led_brightness brightness);
+ int (*torch_brightness_update)(struct led_classdev *led_cdev);
+ int (*flash_brightness_set)(struct led_classdev_flash *flash,
+ u32 brightness);
+ int (*flash_brightness_update)(struct led_classdev_flash *flash);
+ int (*strobe_set)(struct led_classdev_flash *flash, bool state);
+ int (*strobe_get)(struct led_classdev_flash *flash, bool *state);
+ int (*timeout_set)(struct led_classdev_flash *flash, u32 timeout);
+ int (*indicator_brightness_set)(struct led_classdev_flash *flash,
+ u32 brightness);
+ int (*indicator_brightness_update)(struct led_classdev_flash *flash);
+ int (*external_strobe_set)(struct led_classdev_flash *flash,
+ bool enable);
+ int (*fault_get)(struct led_classdev_flash *flash, u32 *fault);
+ void (*sysfs_lock)(struct led_classdev *led_cdev);
+ void (*sysfs_unlock)(struct led_classdev *led_cdev);
+};
+
+/**
+ * struct v4l2_flash_ctrl - controls that define the sub-dev's state
+ * @source: V4L2_CID_FLASH_STROBE_SOURCE control
+ * @led_mode: V4L2_CID_FLASH_LED_MODE control
+ * @torch_intensity: V4L2_CID_FLASH_TORCH_INTENSITY control
+ */
+struct v4l2_flash_ctrl {
+ struct v4l2_ctrl *source;
+ struct v4l2_ctrl *led_mode;
+ struct v4l2_ctrl *torch_intensity;
+};
+
+/**
+ * struct v4l2_flash_ctrl_config - V4L2 Flash controls initialization data
+ * @torch_intensity: V4L2_CID_FLASH_TORCH_INTENSITY constraints
+ * @flash_intensity: V4L2_CID_FLASH_INTENSITY constraints
+ * @indicator_intensity: V4L2_CID_FLASH_INDICATOR_INTENSITY constraints
+ * @flash_timeout: V4L2_CID_FLASH_TIMEOUT constraints
+ * @flash_fault: possible flash faults
+ */
+struct v4l2_flash_ctrl_config {
+ struct v4l2_ctrl_config torch_intensity;
+ struct v4l2_ctrl_config flash_intensity;
+ struct v4l2_ctrl_config indicator_intensity;
+ struct v4l2_ctrl_config flash_timeout;
+ u32 flash_faults;
+};
+
+/**
+ * struct v4l2_flash - Flash sub-device context
+ * @flash: LED Flash Class device controlled by this sub-device
+ * @ops: LED Flash Class device ops
+ * @sd: V4L2 sub-device
+ * @hdl: flash controls handler
+ * @ctrl: state defining controls
+ * @config: V4L2 Flash controlsrconfiguration data
+ * @software_strobe_gates: route to the software strobe signal
+ * @external_strobe_gates: route to the external strobe signal
+ * @sensors: available external strobe sources
+ */
+struct v4l2_flash {
+ struct led_classdev_flash *flash;
+ const struct v4l2_flash_ops *ops;
+
+ struct v4l2_subdev sd;
+ struct v4l2_ctrl_handler hdl;
+ struct v4l2_flash_ctrl ctrl;
+ struct v4l2_flash_ctrl_config config;
+ char **strobe_providers_menu;
+};
+
+static inline struct v4l2_flash *v4l2_subdev_to_v4l2_flash(
+ struct v4l2_subdev *sd)
+{
+ return container_of(sd, struct v4l2_flash, sd);
+}
+
+static inline struct v4l2_flash *v4l2_ctrl_to_v4l2_flash(struct v4l2_ctrl *c)
+{
+ return container_of(c->handler, struct v4l2_flash, hdl);
+}
+
+#ifdef CONFIG_V4L2_FLASH_LED_CLASS
+/**
+ * v4l2_flash_init - initialize V4L2 flash led sub-device
+ * @led_fdev: the LED Flash Class device to wrap
+ * @config: initialization data for V4L2 Flash controls
+ * @flash_ops: V4L2 Flash device ops
+ * @out_flash: handler to the new V4L2 Flash device
+ *
+ * Create V4L2 subdev wrapping given LED subsystem device.
+
+ * Returns: 0 on success or negative error value on failure
+ */
+int v4l2_flash_init(struct led_classdev_flash *led_fdev,
+ struct v4l2_flash_ctrl_config *config,
+ const struct v4l2_flash_ops *flash_ops,
+ struct v4l2_flash **out_flash);
+
+/**
+ * v4l2_flash_release - release V4L2 Flash sub-device
+ * @flash: the V4L2 Flash device to release
+ *
+ * Release V4L2 flash led subdev.
+ */
+void v4l2_flash_release(struct v4l2_flash *v4l2_flash);
+
+#else
+#define v4l2_flash_init(led_cdev, config, flash_ops, out_flash) (0)
+#define v4l2_flash_release(v4l2_flash)
+#endif /* CONFIG_V4L2_FLASH_LED_CLASS */
+
+#endif /* _V4L2_FLASH_H */
--
1.7.9.5
--
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