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>
---
drivers/media/v4l2-core/Kconfig | 10 +
drivers/media/v4l2-core/Makefile | 2 +
drivers/media/v4l2-core/v4l2-flash.c | 393 ++++++++++++++++++++++++++++++++++
include/media/v4l2-flash.h | 119 ++++++++++
4 files changed, 524 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 2189bfb..1f8514d 100644
--- a/drivers/media/v4l2-core/Kconfig
+++ b/drivers/media/v4l2-core/Kconfig
@@ -35,6 +35,16 @@ config V4L2_MEM2MEM_DEV
tristate
depends on VIDEOBUF2_CORE
+# Used by LED subsystem flash drivers
+config V4L2_FLASH
+ bool "Enable support for Flash sub-devices"
+ 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 c6ae7ba..8e37ab4 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-$(CONFIG_V4L2_FLASH) += v4l2-flash.o
+
obj-$(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..f1be332
--- /dev/null
+++ b/drivers/media/v4l2-core/v4l2-flash.c
@@ -0,0 +1,393 @@
+/*
+ * 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/leds_flash.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-dev.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-event.h>
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-flash.h>
+
+static inline enum led_brightness v4l2_flash_intensity_to_led_brightness(
+ struct led_ctrl *config,
+ u32 intensity)
+{
+ return intensity / config->step;
+}
+
+static inline u32 v4l2_flash_led_brightness_to_intensity(
+ struct led_ctrl *config,
+ enum led_brightness brightness)
+{
+ return brightness * config->step;
+}
+
+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 *led_cdev = v4l2_flash->led_cdev;
+ struct led_flash *flash = led_cdev->flash;
+ struct v4l2_flash_ctrl *ctrl = &v4l2_flash->ctrl;
+ u32 fault;
+ int ret;
+
+ switch (c->id) {
+ case V4L2_CID_FLASH_TORCH_INTENSITY:
+ if (ctrl->led_mode->val == V4L2_FLASH_LED_MODE_TORCH) {
+ ret = v4l2_call_flash_op(brightness_update, led_cdev);
+ if (ret < 0)
+ return ret;
+ ctrl->torch_intensity->val =
+ v4l2_flash_led_brightness_to_intensity(
+ &led_cdev->brightness_ctrl,
+ led_cdev->brightness);
+ }
+ return 0;
+ case V4L2_CID_FLASH_INTENSITY:
+ ret = v4l2_call_flash_op(flash_brightness_update, led_cdev);
+ if (ret < 0)
+ return ret;
+ /* no conversion is needed */
+ c->val = flash->brightness.val;
+ return 0;
+ case V4L2_CID_FLASH_INDICATOR_INTENSITY:
+ ret = v4l2_call_flash_op(indicator_brightness_update, led_cdev);
+ if (ret < 0)
+ return ret;
+ /* no conversion is needed */
+ c->val = flash->indicator_brightness->val;
+ return 0;
+ case V4L2_CID_FLASH_STROBE_STATUS:
+ ret = v4l2_call_flash_op(strobe_get, led_cdev);
+ if (ret < 0)
+ return ret;
+ c->val = !!ret;
+ return 0;
+ case V4L2_CID_FLASH_FAULT:
+ /* led faults map directly to V4L2 flash faults */
+ ret = v4l2_call_flash_op(fault_get, led_cdev, &fault);
+ if (!ret)
+ c->val = fault;
+ return ret;
+ 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 *led_cdev = v4l2_flash->led_cdev;
+ struct v4l2_flash_ctrl *ctrl = &v4l2_flash->ctrl;
+ 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:
+ v4l2_call_flash_op(brightness_set, led_cdev, 0);
+ return v4l2_call_flash_op(strobe_set, led_cdev, false);
+ case V4L2_FLASH_LED_MODE_FLASH:
+ /* Turn off torch LED */
+ v4l2_call_flash_op(brightness_set, led_cdev, 0);
+ external_strobe = (ctrl->source->val ==
+ V4L2_FLASH_STROBE_SOURCE_EXTERNAL);
+ return v4l2_call_flash_op(external_strobe_set, led_cdev,
+ external_strobe);
+ case V4L2_FLASH_LED_MODE_TORCH:
+ /* Stop flash strobing */
+ ret = v4l2_call_flash_op(strobe_set, led_cdev, false);
+ if (ret)
+ return ret;
+ /* torch is always triggered by software */
+ ret = v4l2_call_flash_op(external_strobe_set, led_cdev,
+ false);
+ if (ret)
+ return ret;
+
+ torch_brightness =
+ v4l2_flash_intensity_to_led_brightness(
+ &led_cdev->brightness_ctrl,
+ ctrl->torch_intensity->val);
+ v4l2_call_flash_op(brightness_set, led_cdev,
+ torch_brightness);
+ return ret;
+ }
+ break;
+ case V4L2_CID_FLASH_STROBE_SOURCE:
+ return v4l2_call_flash_op(external_strobe_set, led_cdev,
+ c->val == V4L2_FLASH_STROBE_SOURCE_EXTERNAL);
+ 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 v4l2_call_flash_op(strobe_set, led_cdev, true);
+ case V4L2_CID_FLASH_STROBE_STOP:
+ return v4l2_call_flash_op(strobe_set, led_cdev, false);
+ case V4L2_CID_FLASH_TIMEOUT:
+ ret = v4l2_call_flash_op(timeout_set, led_cdev, c->val);
+ case V4L2_CID_FLASH_INTENSITY:
+ /* no conversion is needed */
+ return v4l2_call_flash_op(flash_brightness_set, led_cdev,
+ c->val);
+ case V4L2_CID_FLASH_INDICATOR_INTENSITY:
+ /* no conversion is needed */
+ return v4l2_call_flash_op(indicator_brightness_set, led_cdev,
+ c->val);
+ case V4L2_CID_FLASH_TORCH_INTENSITY:
+ if (ctrl->led_mode->val == V4L2_FLASH_LED_MODE_TORCH) {
+ torch_brightness =
+ v4l2_flash_intensity_to_led_brightness(
+ &led_cdev->brightness_ctrl,
+ ctrl->torch_intensity->val);
+ v4l2_call_flash_op(brightness_set, led_cdev,
+ torch_brightness);
+ }
+ 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_controls(struct v4l2_flash *v4l2_flash)
+
+{
+ struct led_classdev *led_cdev = v4l2_flash->led_cdev;
+ struct led_flash *flash = led_cdev->flash;
+ bool has_indicator = flash->indicator_brightness;
+ struct v4l2_ctrl *ctrl;
+ struct led_ctrl *ctrl_cfg;
+ unsigned int mask;
+ int ret, max, num_ctrls;
+
+ num_ctrls = flash->has_flash_led ? 8 : 2;
+ if (flash->fault_flags)
+ ++num_ctrls;
+ if (has_indicator)
+ ++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->has_flash_led)
+ 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 = &led_cdev->brightness_ctrl;
+ 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->val);
+ if (ctrl)
+ ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
+ v4l2_flash->ctrl.torch_intensity = ctrl;
+
+ if (flash->has_flash_led) {
+ /* 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);
+
+ /* 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 (ctrl)
+ ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE |
+ V4L2_CTRL_FLAG_READ_ONLY;
+
+ /* Configure FLASH_TIMEOUT ctrl */
+ ctrl_cfg = &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->val);
+ if (ctrl)
+ ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
+
+ /* Configure FLASH_INTENSITY ctrl */
+ ctrl_cfg = &flash->brightness;
+ 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->val);
+ if (ctrl)
+ ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
+
+ if (flash->fault_flags) {
+ /* Configure FLASH_FAULT ctrl */
+ ctrl = v4l2_ctrl_new_std(&v4l2_flash->hdl,
+ &v4l2_flash_ctrl_ops,
+ V4L2_CID_FLASH_FAULT, 0,
+ flash->fault_flags,
+ 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 = flash->indicator_brightness;
+ 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->val);
+ if (ctrl)
+ ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
+ }
+ }
+
+ if (v4l2_flash->hdl.error) {
+ ret = v4l2_flash->hdl.error;
+ goto error_free;
+ }
+
+ ret = v4l2_ctrl_handler_setup(&v4l2_flash->hdl);
+ if (ret < 0)
+ goto error_free;
+
+ v4l2_flash->subdev.ctrl_handler = &v4l2_flash->hdl;
+
+ return 0;
+
+error_free:
+ 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 *led_cdev = v4l2_flash->led_cdev;
+
+ mutex_lock(&led_cdev->led_lock);
+ v4l2_call_flash_op(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 *led_cdev = v4l2_flash->led_cdev;
+
+ mutex_lock(&led_cdev->led_lock);
+ v4l2_call_flash_op(sysfs_unlock, led_cdev);
+ mutex_unlock(&led_cdev->led_lock);
+
+ return 0;
+}
+
+static const struct v4l2_subdev_internal_ops v4l2_flash_subdev_internal_ops = {
+ .open = v4l2_flash_open,
+ .close = v4l2_flash_close,
+};
+
+static struct v4l2_subdev_ops v4l2_flash_subdev_ops = {
+};
+
+int v4l2_flash_init(struct led_classdev *led_cdev,
+ const struct v4l2_flash_ops *ops)
+{
+ struct v4l2_flash *flash = &led_cdev->flash->v4l2_flash;
+ struct v4l2_subdev *sd = &flash->subdev;
+ int ret;
+
+ if (!led_cdev || !ops)
+ return -EINVAL;
+
+ flash->led_cdev = led_cdev;
+ 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);
+
+ flash->ops = ops;
+
+ ret = v4l2_flash_init_controls(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_async_register_subdev(sd);
+ if (ret < 0)
+ goto err_init_entity;
+
+ return 0;
+
+err_init_entity:
+ media_entity_cleanup(&sd->entity);
+err_init_controls:
+ v4l2_ctrl_handler_free(sd->ctrl_handler);
+ return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(v4l2_flash_init);
+
+void v4l2_flash_release(struct led_classdev *led_cdev)
+{
+ struct v4l2_flash *flash = &led_cdev->flash->v4l2_flash;
+
+ v4l2_ctrl_handler_free(flash->subdev.ctrl_handler);
+ v4l2_async_unregister_subdev(&flash->subdev);
+ media_entity_cleanup(&flash->subdev.entity);
+}
+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..fe16ddd
--- /dev/null
+++ b/include/media/v4l2-flash.h
@@ -0,0 +1,119 @@
+/*
+ * 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>
+
+#define v4l2_call_flash_op(op, args...) \
+ ((v4l2_flash)->ops->op(args)) \
+
+struct led_classdev;
+enum led_brightness;
+
+struct v4l2_flash_ops {
+ void (*brightness_set)(struct led_classdev *led_cdev,
+ enum led_brightness brightness);
+ int (*brightness_update)(struct led_classdev *led_cdev);
+ int (*flash_brightness_set)(struct led_classdev *led_cdev,
+ u32 brightness);
+ int (*flash_brightness_update)(struct led_classdev *led_cdev);
+ int (*strobe_set)(struct led_classdev *led_cdev,
+ bool state);
+ int (*strobe_get)(struct led_classdev *led_cdev);
+ int (*timeout_set)(struct led_classdev *led_cdev,
+ u32 timeout);
+ int (*indicator_brightness_set)(struct led_classdev *led_cdev,
+ u32 brightness);
+ int (*indicator_brightness_update)(struct led_classdev *led_cdev);
+ int (*external_strobe_set)(struct led_classdev *led_cdev,
+ bool enable);
+ int (*fault_get)(struct led_classdev *led_cdev,
+ 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 - Flash sub-device context
+ * @led_cdev: LED class device controlled by this sub-device
+ * @ops: LED class device ops
+ * @subdev: V4L2 sub-device
+ * @hdl: flash controls handler
+ * @ctrl: state defining controls
+ */
+struct v4l2_flash {
+ struct led_classdev *led_cdev;
+ const struct v4l2_flash_ops *ops;
+
+ struct v4l2_subdev subdev;
+ struct v4l2_ctrl_handler hdl;
+ struct v4l2_flash_ctrl ctrl;
+};
+
+static inline struct v4l2_flash *v4l2_subdev_to_v4l2_flash(struct v4l2_subdev *sd)
+{
+ return container_of(sd, struct v4l2_flash, subdev);
+}
+
+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
+/**
+ * v4l2_flash_init - initialize V4L2 flash led sub-device
+ * @led_cdev: the LED to create subdev upon
+ * @ops: LED subsystem callbacks
+ *
+ * Create V4L2 subdev wrapping given LED subsystem device.
+ */
+int v4l2_flash_init(struct led_classdev *led_cdev,
+ const struct v4l2_flash_ops *ops);
+
+/**
+ * v4l2_flash_release - release V4L2 flash led sub-device
+ * @flash: a structure representing V4L2 flash led device
+ *
+ * Release V4L2 flash led subdev.
+ */
+void v4l2_flash_release(struct led_classdev *led_cdev);
+#else
+static inline int v4l2_flash_init(struct led_classdev *led_cdev,
+ const struct v4l2_flash_ops *ops)
+{
+ return 0;
+}
+
+static inline void v4l2_flash_release(struct led_classdev *led_cdev)
+{
+}
+#endif /* CONFIG_V4L2_FLASH */
+
+#endif /* _V4L2_FLASH_H */
--
1.7.9.5
--
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