Linux-libre 4.2-gnu

12 files changed, 1248 insertions, 87 deletions

diff --git a/drivers/media/v4l2-core/Kconfig b/drivers/media/v4l2-core/Kconfig
index ba7e21a73..b4b022933 100644
--- a/drivers/media/v4l2-core/Kconfig
+++ b/drivers/media/v4l2-core/Kconfig
@@ -44,6 +44,17 @@ config V4L2_MEM2MEM_DEV
         tristate
         depends on VIDEOBUF2_CORE
 
+# Used by LED subsystem flash drivers
+config V4L2_FLASH_LED_CLASS
+	tristate "V4L2 flash API for LED flash class devices"
+	depends on VIDEO_V4L2_SUBDEV_API
+	depends on LEDS_CLASS_FLASH
+	---help---
+	  Say Y here to enable V4L2 flash API support for LED flash
+	  class drivers.
+
+	  When in doubt, say N.
+
 # Used by drivers that need Videobuf modules
 config VIDEOBUF_GEN
 	tristate
@@ -89,7 +100,7 @@ config VIDEOBUF2_VMALLOC
 
 config VIDEOBUF2_DMA_SG
 	tristate
-	#depends on HAS_DMA
+	depends on HAS_DMA
 	select VIDEOBUF2_CORE
 	select VIDEOBUF2_MEMOPS
 
diff --git a/drivers/media/v4l2-core/Makefile b/drivers/media/v4l2-core/Makefile
index 63d29f275..dc3de00d6 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-$(CONFIG_V4L2_FLASH_LED_CLASS) += v4l2-flash-led-class.o
+
 obj-$(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-async.c b/drivers/media/v4l2-core/v4l2-async.c
index 85a6a3412..5bada202b 100644
--- a/drivers/media/v4l2-core/v4l2-async.c
+++ b/drivers/media/v4l2-core/v4l2-async.c
@@ -22,10 +22,10 @@
 #include <media/v4l2-device.h>
 #include <media/v4l2-subdev.h>
 
-static bool match_i2c(struct device *dev, struct v4l2_async_subdev *asd)
+static bool match_i2c(struct v4l2_subdev *sd, struct v4l2_async_subdev *asd)
 {
 #if IS_ENABLED(CONFIG_I2C)
-	struct i2c_client *client = i2c_verify_client(dev);
+	struct i2c_client *client = i2c_verify_client(sd->dev);
 	return client &&
 		asd->match.i2c.adapter_id == client->adapter->nr &&
 		asd->match.i2c.address == client->addr;
@@ -34,14 +34,24 @@ static bool match_i2c(struct device *dev, struct v4l2_async_subdev *asd)
 #endif
 }
 
-static bool match_devname(struct device *dev, struct v4l2_async_subdev *asd)
+static bool match_devname(struct v4l2_subdev *sd,
+			  struct v4l2_async_subdev *asd)
 {
-	return !strcmp(asd->match.device_name.name, dev_name(dev));
+	return !strcmp(asd->match.device_name.name, dev_name(sd->dev));
 }
 
-static bool match_of(struct device *dev, struct v4l2_async_subdev *asd)
+static bool match_of(struct v4l2_subdev *sd, struct v4l2_async_subdev *asd)
 {
-	return dev->of_node == asd->match.of.node;
+	return sd->of_node == asd->match.of.node;
+}
+
+static bool match_custom(struct v4l2_subdev *sd, struct v4l2_async_subdev *asd)
+{
+	if (!asd->match.custom.match)
+		/* Match always */
+		return true;
+
+	return asd->match.custom.match(sd->dev, asd);
 }
 
 static LIST_HEAD(subdev_list);
@@ -51,17 +61,14 @@ static DEFINE_MUTEX(list_lock);
 static struct v4l2_async_subdev *v4l2_async_belongs(struct v4l2_async_notifier *notifier,
 						    struct v4l2_subdev *sd)
 {
+	bool (*match)(struct v4l2_subdev *, struct v4l2_async_subdev *);
 	struct v4l2_async_subdev *asd;
-	bool (*match)(struct device *, struct v4l2_async_subdev *);
 
 	list_for_each_entry(asd, &notifier->waiting, list) {
 		/* bus_type has been verified valid before */
 		switch (asd->match_type) {
 		case V4L2_ASYNC_MATCH_CUSTOM:
-			match = asd->match.custom.match;
-			if (!match)
-				/* Match always */
-				return asd;
+			match = match_custom;
 			break;
 		case V4L2_ASYNC_MATCH_DEVNAME:
 			match = match_devname;
@@ -79,7 +86,7 @@ static struct v4l2_async_subdev *v4l2_async_belongs(struct v4l2_async_notifier *
 		}
 
 		/* match cannot be NULL here */
-		if (match(sd->dev, asd))
+		if (match(sd, asd))
 			return asd;
 	}
 
@@ -266,6 +273,14 @@ int v4l2_async_register_subdev(struct v4l2_subdev *sd)
 {
 	struct v4l2_async_notifier *notifier;
 
+	/*
+	 * No reference taken. The reference is held by the device
+	 * (struct v4l2_subdev.dev), and async sub-device does not
+	 * exist independently of the device at any point of time.
+	 */
+	if (!sd->of_node && sd->dev)
+		sd->of_node = sd->dev->of_node;
+
 	mutex_lock(&list_lock);
 
 	INIT_LIST_HEAD(&sd->async_list);
diff --git a/drivers/media/v4l2-core/v4l2-dv-timings.c b/drivers/media/v4l2-core/v4l2-dv-timings.c
index c0e96382f..04dc71e3e 100644
--- a/drivers/media/v4l2-core/v4l2-dv-timings.c
+++ b/drivers/media/v4l2-core/v4l2-dv-timings.c
@@ -25,6 +25,7 @@
 #include <linux/videodev2.h>
 #include <linux/v4l2-dv-timings.h>
 #include <media/v4l2-dv-timings.h>
+#include <linux/math64.h>
 
 MODULE_AUTHOR("Hans Verkuil");
 MODULE_DESCRIPTION("V4L2 DV Timings Helper Functions");
@@ -261,6 +262,8 @@ void v4l2_print_dv_timings(const char *dev_prefix, const char *prefix,
 
 	htot = V4L2_DV_BT_FRAME_WIDTH(bt);
 	vtot = V4L2_DV_BT_FRAME_HEIGHT(bt);
+	if (bt->interlaced)
+		vtot /= 2;
 
 	if (prefix == NULL)
 		prefix = "";
@@ -281,6 +284,11 @@ void v4l2_print_dv_timings(const char *dev_prefix, const char *prefix,
 			dev_prefix, bt->vfrontporch,
 			(bt->polarities & V4L2_DV_VSYNC_POS_POL) ? "+" : "-",
 			bt->vsync, bt->vbackporch);
+	if (bt->interlaced)
+		pr_info("%s: vertical bottom field: fp = %u, %ssync = %u, bp = %u\n",
+			dev_prefix, bt->il_vfrontporch,
+			(bt->polarities & V4L2_DV_VSYNC_POS_POL) ? "+" : "-",
+			bt->il_vsync, bt->il_vbackporch);
 	pr_info("%s: pixelclock: %llu\n", dev_prefix, bt->pixelclock);
 	pr_info("%s: flags (0x%x):%s%s%s%s%s\n", dev_prefix, bt->flags,
 			(bt->flags & V4L2_DV_FL_REDUCED_BLANKING) ?
@@ -313,6 +321,7 @@ EXPORT_SYMBOL_GPL(v4l2_print_dv_timings);
 #define CVT_MIN_V_BPORCH	7	/* lines */
 #define CVT_MIN_V_PORCH_RND	3	/* lines */
 #define CVT_MIN_VSYNC_BP	550	/* min time of vsync + back porch (us) */
+#define CVT_HSYNC_PERCENT       8       /* nominal hsync as percentage of line */
 
 /* Normal blanking for CVT uses GTF to calculate horizontal blanking */
 #define CVT_CELL_GRAN		8	/* character cell granularity */
@@ -337,6 +346,7 @@ EXPORT_SYMBOL_GPL(v4l2_print_dv_timings);
  * @vsync - the height of the vertical sync in lines.
  * @polarities - the horizontal and vertical polarities (same as struct
  *		v4l2_bt_timings polarities).
+ * @interlaced - if this flag is true, it indicates interlaced format
  * @fmt - the resulting timings.
  *
  * This function will attempt to detect if the given values correspond to a
@@ -348,7 +358,7 @@ EXPORT_SYMBOL_GPL(v4l2_print_dv_timings);
  * detection function.
  */
 bool v4l2_detect_cvt(unsigned frame_height, unsigned hfreq, unsigned vsync,
-		u32 polarities, struct v4l2_dv_timings *fmt)
+		u32 polarities, bool interlaced, struct v4l2_dv_timings *fmt)
 {
 	int  v_fp, v_bp, h_fp, h_bp, hsync;
 	int  frame_width, image_height, image_width;
@@ -365,22 +375,32 @@ bool v4l2_detect_cvt(unsigned frame_height, unsigned hfreq, unsigned vsync,
 	else
 		return false;
 
+	if (hfreq == 0)
+		return false;
+
 	/* Vertical */
 	if (reduced_blanking) {
 		v_fp = CVT_RB_V_FPORCH;
-		v_bp = (CVT_RB_MIN_V_BLANK * hfreq + 1999999) / 1000000;
+		v_bp = (CVT_RB_MIN_V_BLANK * hfreq) / 1000000 + 1;
 		v_bp -= vsync + v_fp;
 
 		if (v_bp < CVT_RB_MIN_V_BPORCH)
 			v_bp = CVT_RB_MIN_V_BPORCH;
 	} else {
 		v_fp = CVT_MIN_V_PORCH_RND;
-		v_bp = (CVT_MIN_VSYNC_BP * hfreq + 1999999) / 1000000 - vsync;
+		v_bp = (CVT_MIN_VSYNC_BP * hfreq) / 1000000 + 1 - vsync;
 
 		if (v_bp < CVT_MIN_V_BPORCH)
 			v_bp = CVT_MIN_V_BPORCH;
 	}
-	image_height = (frame_height - v_fp - vsync - v_bp + 1) & ~0x1;
+
+	if (interlaced)
+		image_height = (frame_height - 2 * v_fp - 2 * vsync - 2 * v_bp) & ~0x1;
+	else
+		image_height = (frame_height - v_fp - vsync - v_bp + 1) & ~0x1;
+
+	if (image_height < 0)
+		return false;
 
 	/* Aspect ratio based on vsync */
 	switch (vsync) {
@@ -436,8 +456,8 @@ bool v4l2_detect_cvt(unsigned frame_height, unsigned hfreq, unsigned vsync,
 		h_bp = h_blank / 2;
 		frame_width = image_width + h_blank;
 
-		hsync = (frame_width * 8 + 50) / 100;
-		hsync = hsync - hsync % CVT_CELL_GRAN;
+		hsync = frame_width * CVT_HSYNC_PERCENT / 100;
+		hsync = (hsync / CVT_CELL_GRAN) * CVT_CELL_GRAN;
 		h_fp = h_blank - hsync - h_bp;
 	}
 
@@ -450,11 +470,27 @@ bool v4l2_detect_cvt(unsigned frame_height, unsigned hfreq, unsigned vsync,
 	fmt->bt.hsync = hsync;
 	fmt->bt.vsync = vsync;
 	fmt->bt.hbackporch = frame_width - image_width - h_fp - hsync;
-	fmt->bt.vbackporch = frame_height - image_height - v_fp - vsync;
+
+	if (!interlaced) {
+		fmt->bt.vbackporch = frame_height - image_height - v_fp - vsync;
+		fmt->bt.interlaced = V4L2_DV_PROGRESSIVE;
+	} else {
+		fmt->bt.vbackporch = (frame_height - image_height - 2 * v_fp -
+				      2 * vsync) / 2;
+		fmt->bt.il_vbackporch = frame_height - image_height - 2 * v_fp -
+					2 * vsync - fmt->bt.vbackporch;
+		fmt->bt.il_vfrontporch = v_fp;
+		fmt->bt.il_vsync = vsync;
+		fmt->bt.flags |= V4L2_DV_FL_HALF_LINE;
+		fmt->bt.interlaced = V4L2_DV_INTERLACED;
+	}
+
 	fmt->bt.pixelclock = pix_clk;
 	fmt->bt.standards = V4L2_DV_BT_STD_CVT;
+
 	if (reduced_blanking)
 		fmt->bt.flags |= V4L2_DV_FL_REDUCED_BLANKING;
+
 	return true;
 }
 EXPORT_SYMBOL_GPL(v4l2_detect_cvt);
@@ -493,6 +529,7 @@ EXPORT_SYMBOL_GPL(v4l2_detect_cvt);
  * @vsync - the height of the vertical sync in lines.
  * @polarities - the horizontal and vertical polarities (same as struct
  *		v4l2_bt_timings polarities).
+ * @interlaced - if this flag is true, it indicates interlaced format
  * @aspect - preferred aspect ratio. GTF has no method of determining the
  *		aspect ratio in order to derive the image width from the
  *		image height, so it has to be passed explicitly. Usually
@@ -508,6 +545,7 @@ bool v4l2_detect_gtf(unsigned frame_height,
 		unsigned hfreq,
 		unsigned vsync,
 		u32 polarities,
+		bool interlaced,
 		struct v4l2_fract aspect,
 		struct v4l2_dv_timings *fmt)
 {
@@ -527,10 +565,19 @@ bool v4l2_detect_gtf(unsigned frame_height,
 	else
 		return false;
 
+	if (hfreq == 0)
+		return false;
+
 	/* Vertical */
 	v_fp = GTF_V_FP;
-	v_bp = (GTF_MIN_VSYNC_BP * hfreq + 999999) / 1000000 - vsync;
-	image_height = (frame_height - v_fp - vsync - v_bp + 1) & ~0x1;
+	v_bp = (GTF_MIN_VSYNC_BP * hfreq + 500000) / 1000000 - vsync;
+	if (interlaced)
+		image_height = (frame_height - 2 * v_fp - 2 * vsync - 2 * v_bp) & ~0x1;
+	else
+		image_height = (frame_height - v_fp - vsync - v_bp + 1) & ~0x1;
+
+	if (image_height < 0)
+		return false;
 
 	if (aspect.numerator == 0 || aspect.denominator == 0) {
 		aspect.numerator = 16;
@@ -540,25 +587,35 @@ bool v4l2_detect_gtf(unsigned frame_height,
 	image_width = (image_width + GTF_CELL_GRAN/2) & ~(GTF_CELL_GRAN - 1);
 
 	/* Horizontal */
-	if (default_gtf)
-		h_blank = ((image_width * GTF_D_C_PRIME * hfreq) -
-					(image_width * GTF_D_M_PRIME * 1000) +
-			(hfreq * (100 - GTF_D_C_PRIME) + GTF_D_M_PRIME * 1000) / 2) /
-			(hfreq * (100 - GTF_D_C_PRIME) + GTF_D_M_PRIME * 1000);
-	else
-		h_blank = ((image_width * GTF_S_C_PRIME * hfreq) -
-					(image_width * GTF_S_M_PRIME * 1000) +
-			(hfreq * (100 - GTF_S_C_PRIME) + GTF_S_M_PRIME * 1000) / 2) /
-			(hfreq * (100 - GTF_S_C_PRIME) + GTF_S_M_PRIME * 1000);
+	if (default_gtf) {
+		u64 num;
+		u32 den;
+
+		num = ((image_width * GTF_D_C_PRIME * (u64)hfreq) -
+		      ((u64)image_width * GTF_D_M_PRIME * 1000));
+		den = (hfreq * (100 - GTF_D_C_PRIME) + GTF_D_M_PRIME * 1000) *
+		      (2 * GTF_CELL_GRAN);
+		h_blank = div_u64((num + (den >> 1)), den);
+		h_blank *= (2 * GTF_CELL_GRAN);
+	} else {
+		u64 num;
+		u32 den;
+
+		num = ((image_width * GTF_S_C_PRIME * (u64)hfreq) -
+		      ((u64)image_width * GTF_S_M_PRIME * 1000));
+		den = (hfreq * (100 - GTF_S_C_PRIME) + GTF_S_M_PRIME * 1000) *
+		      (2 * GTF_CELL_GRAN);
+		h_blank = div_u64((num + (den >> 1)), den);
+		h_blank *= (2 * GTF_CELL_GRAN);
+	}
 
-	h_blank = h_blank - h_blank % (2 * GTF_CELL_GRAN);
 	frame_width = image_width + h_blank;
 
 	pix_clk = (image_width + h_blank) * hfreq;
 	pix_clk = pix_clk / GTF_PXL_CLK_GRAN * GTF_PXL_CLK_GRAN;
 
 	hsync = (frame_width * 8 + 50) / 100;
-	hsync = hsync - hsync % GTF_CELL_GRAN;
+	hsync = ((hsync + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN) * GTF_CELL_GRAN;
 
 	h_fp = h_blank / 2 - hsync;
 
@@ -571,11 +628,27 @@ bool v4l2_detect_gtf(unsigned frame_height,
 	fmt->bt.hsync = hsync;
 	fmt->bt.vsync = vsync;
 	fmt->bt.hbackporch = frame_width - image_width - h_fp - hsync;
-	fmt->bt.vbackporch = frame_height - image_height - v_fp - vsync;
+
+	if (!interlaced) {
+		fmt->bt.vbackporch = frame_height - image_height - v_fp - vsync;
+		fmt->bt.interlaced = V4L2_DV_PROGRESSIVE;
+	} else {
+		fmt->bt.vbackporch = (frame_height - image_height - 2 * v_fp -
+				      2 * vsync) / 2;
+		fmt->bt.il_vbackporch = frame_height - image_height - 2 * v_fp -
+					2 * vsync - fmt->bt.vbackporch;
+		fmt->bt.il_vfrontporch = v_fp;
+		fmt->bt.il_vsync = vsync;
+		fmt->bt.flags |= V4L2_DV_FL_HALF_LINE;
+		fmt->bt.interlaced = V4L2_DV_INTERLACED;
+	}
+
 	fmt->bt.pixelclock = pix_clk;
 	fmt->bt.standards = V4L2_DV_BT_STD_GTF;
+
 	if (!default_gtf)
 		fmt->bt.flags |= V4L2_DV_FL_REDUCED_BLANKING;
+
 	return true;
 }
 EXPORT_SYMBOL_GPL(v4l2_detect_gtf);
diff --git a/drivers/media/v4l2-core/v4l2-flash-led-class.c b/drivers/media/v4l2-core/v4l2-flash-led-class.c
new file mode 100644
index 000000000..5bdfb8d52
--- /dev/null
+++ b/drivers/media/v4l2-core/v4l2-flash-led-class.c
@@ -0,0 +1,710 @@
+/*
+ * V4L2 flash LED sub-device registration helpers.
+ *
+ *	Copyright (C) 2015 Samsung Electronics Co., Ltd
+ *	Author: Jacek Anaszewski <j.anaszewski@samsung.com>
+ *
+ * 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/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <media/v4l2-flash-led-class.h>
+
+#define has_flash_op(v4l2_flash, op)				\
+	(v4l2_flash && v4l2_flash->ops->op)
+
+#define call_flash_op(v4l2_flash, op, arg)			\
+		(has_flash_op(v4l2_flash, op) ?			\
+			v4l2_flash->ops->op(v4l2_flash, arg) :	\
+			-EINVAL)
+
+enum ctrl_init_data_id {
+	LED_MODE,
+	TORCH_INTENSITY,
+	FLASH_INTENSITY,
+	INDICATOR_INTENSITY,
+	FLASH_TIMEOUT,
+	STROBE_SOURCE,
+	/*
+	 * Only above values are applicable to
+	 * the 'ctrls' array in the struct v4l2_flash.
+	 */
+	FLASH_STROBE,
+	STROBE_STOP,
+	STROBE_STATUS,
+	FLASH_FAULT,
+	NUM_FLASH_CTRLS,
+};
+
+static enum led_brightness __intensity_to_led_brightness(
+					struct v4l2_ctrl *ctrl, s32 intensity)
+{
+	intensity -= ctrl->minimum;
+	intensity /= (u32) ctrl->step;
+
+	/*
+	 * Indicator LEDs, unlike torch LEDs, are turned on/off basing on
+	 * the state of V4L2_CID_FLASH_INDICATOR_INTENSITY control only.
+	 * Therefore it must be possible to set it to 0 level which in
+	 * the LED subsystem reflects LED_OFF state.
+	 */
+	if (ctrl->minimum)
+		++intensity;
+
+	return intensity;
+}
+
+static s32 __led_brightness_to_intensity(struct v4l2_ctrl *ctrl,
+					 enum led_brightness brightness)
+{
+	/*
+	 * Indicator LEDs, unlike torch LEDs, are turned on/off basing on
+	 * the state of V4L2_CID_FLASH_INDICATOR_INTENSITY control only.
+	 * Do not decrement brightness read from the LED subsystem for
+	 * indicator LED as it may equal 0. For torch LEDs this function
+	 * is called only when V4L2_FLASH_LED_MODE_TORCH is set and the
+	 * brightness read is guaranteed to be greater than 0. In the mode
+	 * V4L2_FLASH_LED_MODE_NONE the cached torch intensity value is used.
+	 */
+	if (ctrl->id != V4L2_CID_FLASH_INDICATOR_INTENSITY)
+		--brightness;
+
+	return (brightness * ctrl->step) + ctrl->minimum;
+}
+
+static void v4l2_flash_set_led_brightness(struct v4l2_flash *v4l2_flash,
+					struct v4l2_ctrl *ctrl)
+{
+	struct v4l2_ctrl **ctrls = v4l2_flash->ctrls;
+	enum led_brightness brightness;
+
+	if (has_flash_op(v4l2_flash, intensity_to_led_brightness))
+		brightness = call_flash_op(v4l2_flash,
+					intensity_to_led_brightness,
+					ctrl->val);
+	else
+		brightness = __intensity_to_led_brightness(ctrl, ctrl->val);
+	/*
+	 * In case a LED Flash class driver provides ops for custom
+	 * brightness <-> intensity conversion, it also must have defined
+	 * related v4l2 control step == 1. In such a case a backward conversion
+	 * from led brightness to v4l2 intensity is required to find out the
+	 * the aligned intensity value.
+	 */
+	if (has_flash_op(v4l2_flash, led_brightness_to_intensity))
+		ctrl->val = call_flash_op(v4l2_flash,
+					led_brightness_to_intensity,
+					brightness);
+
+	if (ctrl == ctrls[TORCH_INTENSITY]) {
+		if (ctrls[LED_MODE]->val != V4L2_FLASH_LED_MODE_TORCH)
+			return;
+
+		led_set_brightness(&v4l2_flash->fled_cdev->led_cdev,
+					brightness);
+	} else {
+		led_set_brightness(&v4l2_flash->iled_cdev->led_cdev,
+					brightness);
+	}
+}
+
+static int v4l2_flash_update_led_brightness(struct v4l2_flash *v4l2_flash,
+					struct v4l2_ctrl *ctrl)
+{
+	struct v4l2_ctrl **ctrls = v4l2_flash->ctrls;
+	struct led_classdev *led_cdev;
+	int ret;
+
+	if (ctrl == ctrls[TORCH_INTENSITY]) {
+		/*
+		 * Update torch brightness only if in TORCH_MODE. In other modes
+		 * torch led is turned off, which would spuriously inform the
+		 * user space that V4L2_CID_FLASH_TORCH_INTENSITY control value
+		 * has changed to 0.
+		 */
+		if (ctrls[LED_MODE]->val != V4L2_FLASH_LED_MODE_TORCH)
+			return 0;
+		led_cdev = &v4l2_flash->fled_cdev->led_cdev;
+	} else {
+		led_cdev = &v4l2_flash->iled_cdev->led_cdev;
+	}
+
+	ret = led_update_brightness(led_cdev);
+	if (ret < 0)
+		return ret;
+
+	if (has_flash_op(v4l2_flash, led_brightness_to_intensity))
+		ctrl->val = call_flash_op(v4l2_flash,
+						led_brightness_to_intensity,
+						led_cdev->brightness);
+	else
+		ctrl->val = __led_brightness_to_intensity(ctrl,
+						led_cdev->brightness);
+
+	return 0;
+}
+
+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 *fled_cdev = v4l2_flash->fled_cdev;
+	bool is_strobing;
+	int ret;
+
+	switch (c->id) {
+	case V4L2_CID_FLASH_TORCH_INTENSITY:
+	case V4L2_CID_FLASH_INDICATOR_INTENSITY:
+		return v4l2_flash_update_led_brightness(v4l2_flash, c);
+	case V4L2_CID_FLASH_INTENSITY:
+		ret = led_update_flash_brightness(fled_cdev);
+		if (ret < 0)
+			return ret;
+		/*
+		 * No conversion is needed as LED Flash class also uses
+		 * microamperes for flash intensity units.
+		 */
+		c->val = fled_cdev->brightness.val;
+		return 0;
+	case V4L2_CID_FLASH_STROBE_STATUS:
+		ret = led_get_flash_strobe(fled_cdev, &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 */
+		return led_get_flash_fault(fled_cdev, &c->val);
+	default:
+		return -EINVAL;
+	}
+}
+
+static bool __software_strobe_mode_inactive(struct v4l2_ctrl **ctrls)
+{
+	return ((ctrls[LED_MODE]->val != V4L2_FLASH_LED_MODE_FLASH) ||
+		(ctrls[STROBE_SOURCE] && (ctrls[STROBE_SOURCE]->val !=
+				V4L2_FLASH_STROBE_SOURCE_SOFTWARE)));
+}
+
+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 *fled_cdev = v4l2_flash->fled_cdev;
+	struct led_classdev *led_cdev = &fled_cdev->led_cdev;
+	struct v4l2_ctrl **ctrls = v4l2_flash->ctrls;
+	bool external_strobe;
+	int ret = 0;
+
+	switch (c->id) {
+	case V4L2_CID_FLASH_LED_MODE:
+		switch (c->val) {
+		case V4L2_FLASH_LED_MODE_NONE:
+			led_set_brightness(led_cdev, LED_OFF);
+			return led_set_flash_strobe(fled_cdev, false);
+		case V4L2_FLASH_LED_MODE_FLASH:
+			/* Turn the torch LED off */
+			led_set_brightness(led_cdev, LED_OFF);
+			if (ctrls[STROBE_SOURCE]) {
+				external_strobe = (ctrls[STROBE_SOURCE]->val ==
+					V4L2_FLASH_STROBE_SOURCE_EXTERNAL);
+
+				ret = call_flash_op(v4l2_flash,
+						external_strobe_set,
+						external_strobe);
+			}
+			return ret;
+		case V4L2_FLASH_LED_MODE_TORCH:
+			if (ctrls[STROBE_SOURCE]) {
+				ret = call_flash_op(v4l2_flash,
+						external_strobe_set,
+						false);
+				if (ret < 0)
+					return ret;
+			}
+			/* Stop flash strobing */
+			ret = led_set_flash_strobe(fled_cdev, false);
+			if (ret < 0)
+				return ret;
+
+			v4l2_flash_set_led_brightness(v4l2_flash,
+							ctrls[TORCH_INTENSITY]);
+			return 0;
+		}
+		break;
+	case V4L2_CID_FLASH_STROBE_SOURCE:
+		external_strobe = (c->val == V4L2_FLASH_STROBE_SOURCE_EXTERNAL);
+		/*
+		 * For some hardware arrangements setting strobe source may
+		 * affect torch mode. Therefore, if not in the flash mode,
+		 * cache only this setting. It will be applied upon switching
+		 * to flash mode.
+		 */
+		if (ctrls[LED_MODE]->val != V4L2_FLASH_LED_MODE_FLASH)
+			return 0;
+
+		return call_flash_op(v4l2_flash, external_strobe_set,
+					external_strobe);
+	case V4L2_CID_FLASH_STROBE:
+		if (__software_strobe_mode_inactive(ctrls))
+			return -EBUSY;
+		return led_set_flash_strobe(fled_cdev, true);
+	case V4L2_CID_FLASH_STROBE_STOP:
+		if (__software_strobe_mode_inactive(ctrls))
+			return -EBUSY;
+		return led_set_flash_strobe(fled_cdev, false);
+	case V4L2_CID_FLASH_TIMEOUT:
+		/*
+		 * No conversion is needed as LED Flash class also uses
+		 * microseconds for flash timeout units.
+		 */
+		return led_set_flash_timeout(fled_cdev, c->val);
+	case V4L2_CID_FLASH_INTENSITY:
+		/*
+		 * No conversion is needed as LED Flash class also uses
+		 * microamperes for flash intensity units.
+		 */
+		return led_set_flash_brightness(fled_cdev, c->val);
+	case V4L2_CID_FLASH_TORCH_INTENSITY:
+	case V4L2_CID_FLASH_INDICATOR_INTENSITY:
+		v4l2_flash_set_led_brightness(v4l2_flash, c);
+		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 void __lfs_to_v4l2_ctrl_config(struct led_flash_setting *s,
+				struct v4l2_ctrl_config *c)
+{
+	c->min = s->min;
+	c->max = s->max;
+	c->step = s->step;
+	c->def = s->val;
+}
+
+static void __fill_ctrl_init_data(struct v4l2_flash *v4l2_flash,
+			  struct v4l2_flash_config *flash_cfg,
+			  struct v4l2_flash_ctrl_data *ctrl_init_data)
+{
+	struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
+	const struct led_flash_ops *fled_cdev_ops = fled_cdev->ops;
+	struct led_classdev *led_cdev = &fled_cdev->led_cdev;
+	struct v4l2_ctrl_config *ctrl_cfg;
+	u32 mask;
+
+	/* Init FLASH_FAULT ctrl data */
+	if (flash_cfg->flash_faults) {
+		ctrl_init_data[FLASH_FAULT].cid = V4L2_CID_FLASH_FAULT;
+		ctrl_cfg = &ctrl_init_data[FLASH_FAULT].config;
+		ctrl_cfg->id = V4L2_CID_FLASH_FAULT;
+		ctrl_cfg->max = flash_cfg->flash_faults;
+		ctrl_cfg->flags = V4L2_CTRL_FLAG_VOLATILE |
+				  V4L2_CTRL_FLAG_READ_ONLY;
+	}
+
+	/* Init FLASH_LED_MODE ctrl data */
+	mask = 1 << V4L2_FLASH_LED_MODE_NONE |
+	       1 << V4L2_FLASH_LED_MODE_TORCH;
+	if (led_cdev->flags & LED_DEV_CAP_FLASH)
+		mask |= 1 << V4L2_FLASH_LED_MODE_FLASH;
+
+	ctrl_init_data[LED_MODE].cid = V4L2_CID_FLASH_LED_MODE;
+	ctrl_cfg = &ctrl_init_data[LED_MODE].config;
+	ctrl_cfg->id = V4L2_CID_FLASH_LED_MODE;
+	ctrl_cfg->max = V4L2_FLASH_LED_MODE_TORCH;
+	ctrl_cfg->menu_skip_mask = ~mask;
+	ctrl_cfg->def = V4L2_FLASH_LED_MODE_NONE;
+	ctrl_cfg->flags = 0;
+
+	/* Init TORCH_INTENSITY ctrl data */
+	ctrl_init_data[TORCH_INTENSITY].cid = V4L2_CID_FLASH_TORCH_INTENSITY;
+	ctrl_cfg = &ctrl_init_data[TORCH_INTENSITY].config;
+	__lfs_to_v4l2_ctrl_config(&flash_cfg->torch_intensity, ctrl_cfg);
+	ctrl_cfg->id = V4L2_CID_FLASH_TORCH_INTENSITY;
+	ctrl_cfg->flags = V4L2_CTRL_FLAG_VOLATILE |
+			  V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
+
+	/* Init INDICATOR_INTENSITY ctrl data */
+	if (v4l2_flash->iled_cdev) {
+		ctrl_init_data[INDICATOR_INTENSITY].cid =
+					V4L2_CID_FLASH_INDICATOR_INTENSITY;
+		ctrl_cfg = &ctrl_init_data[INDICATOR_INTENSITY].config;
+		__lfs_to_v4l2_ctrl_config(&flash_cfg->indicator_intensity,
+					  ctrl_cfg);
+		ctrl_cfg->id = V4L2_CID_FLASH_INDICATOR_INTENSITY;
+		ctrl_cfg->min = 0;
+		ctrl_cfg->flags = V4L2_CTRL_FLAG_VOLATILE |
+				  V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
+	}
+
+	if (!(led_cdev->flags & LED_DEV_CAP_FLASH))
+		return;
+
+	/* Init FLASH_STROBE ctrl data */
+	ctrl_init_data[FLASH_STROBE].cid = V4L2_CID_FLASH_STROBE;
+	ctrl_cfg = &ctrl_init_data[FLASH_STROBE].config;
+	ctrl_cfg->id = V4L2_CID_FLASH_STROBE;
+
+	/* Init STROBE_STOP ctrl data */
+	ctrl_init_data[STROBE_STOP].cid = V4L2_CID_FLASH_STROBE_STOP;
+	ctrl_cfg = &ctrl_init_data[STROBE_STOP].config;
+	ctrl_cfg->id = V4L2_CID_FLASH_STROBE_STOP;
+
+	/* Init FLASH_STROBE_SOURCE ctrl data */
+	if (flash_cfg->has_external_strobe) {
+		mask = (1 << V4L2_FLASH_STROBE_SOURCE_SOFTWARE) |
+		       (1 << V4L2_FLASH_STROBE_SOURCE_EXTERNAL);
+		ctrl_init_data[STROBE_SOURCE].cid =
+					V4L2_CID_FLASH_STROBE_SOURCE;
+		ctrl_cfg = &ctrl_init_data[STROBE_SOURCE].config;
+		ctrl_cfg->id = V4L2_CID_FLASH_STROBE_SOURCE;
+		ctrl_cfg->max = V4L2_FLASH_STROBE_SOURCE_EXTERNAL;
+		ctrl_cfg->menu_skip_mask = ~mask;
+		ctrl_cfg->def = V4L2_FLASH_STROBE_SOURCE_SOFTWARE;
+	}
+
+	/* Init STROBE_STATUS ctrl data */
+	if (fled_cdev_ops->strobe_get) {
+		ctrl_init_data[STROBE_STATUS].cid =
+					V4L2_CID_FLASH_STROBE_STATUS;
+		ctrl_cfg = &ctrl_init_data[STROBE_STATUS].config;
+		ctrl_cfg->id = V4L2_CID_FLASH_STROBE_STATUS;
+		ctrl_cfg->flags = V4L2_CTRL_FLAG_VOLATILE |
+				  V4L2_CTRL_FLAG_READ_ONLY;
+	}
+
+	/* Init FLASH_TIMEOUT ctrl data */
+	if (fled_cdev_ops->timeout_set) {
+		ctrl_init_data[FLASH_TIMEOUT].cid = V4L2_CID_FLASH_TIMEOUT;
+		ctrl_cfg = &ctrl_init_data[FLASH_TIMEOUT].config;
+		__lfs_to_v4l2_ctrl_config(&fled_cdev->timeout, ctrl_cfg);
+		ctrl_cfg->id = V4L2_CID_FLASH_TIMEOUT;
+	}
+
+	/* Init FLASH_INTENSITY ctrl data */
+	if (fled_cdev_ops->flash_brightness_set) {
+		ctrl_init_data[FLASH_INTENSITY].cid = V4L2_CID_FLASH_INTENSITY;
+		ctrl_cfg = &ctrl_init_data[FLASH_INTENSITY].config;
+		__lfs_to_v4l2_ctrl_config(&fled_cdev->brightness, ctrl_cfg);
+		ctrl_cfg->id = V4L2_CID_FLASH_INTENSITY;
+		ctrl_cfg->flags = V4L2_CTRL_FLAG_VOLATILE |
+				  V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
+	}
+}
+
+static int v4l2_flash_init_controls(struct v4l2_flash *v4l2_flash,
+				struct v4l2_flash_config *flash_cfg)
+
+{
+	struct v4l2_flash_ctrl_data *ctrl_init_data;
+	struct v4l2_ctrl *ctrl;
+	struct v4l2_ctrl_config *ctrl_cfg;
+	int i, ret, num_ctrls = 0;
+
+	v4l2_flash->ctrls = devm_kzalloc(v4l2_flash->sd.dev,
+					sizeof(*v4l2_flash->ctrls) *
+					(STROBE_SOURCE + 1), GFP_KERNEL);
+	if (!v4l2_flash->ctrls)
+		return -ENOMEM;
+
+	/* allocate memory dynamically so as not to exceed stack frame size */
+	ctrl_init_data = kcalloc(NUM_FLASH_CTRLS, sizeof(*ctrl_init_data),
+					GFP_KERNEL);
+	if (!ctrl_init_data)
+		return -ENOMEM;
+
+	__fill_ctrl_init_data(v4l2_flash, flash_cfg, ctrl_init_data);
+
+	for (i = 0; i < NUM_FLASH_CTRLS; ++i)
+		if (ctrl_init_data[i].cid)
+			++num_ctrls;
+
+	v4l2_ctrl_handler_init(&v4l2_flash->hdl, num_ctrls);
+
+	for (i = 0; i < NUM_FLASH_CTRLS; ++i) {
+		ctrl_cfg = &ctrl_init_data[i].config;
+		if (!ctrl_init_data[i].cid)
+			continue;
+
+		if (ctrl_cfg->id == V4L2_CID_FLASH_LED_MODE ||
+		    ctrl_cfg->id == V4L2_CID_FLASH_STROBE_SOURCE)
+			ctrl = v4l2_ctrl_new_std_menu(&v4l2_flash->hdl,
+						&v4l2_flash_ctrl_ops,
+						ctrl_cfg->id,
+						ctrl_cfg->max,
+						ctrl_cfg->menu_skip_mask,
+						ctrl_cfg->def);
+		else
+			ctrl = v4l2_ctrl_new_std(&v4l2_flash->hdl,
+						&v4l2_flash_ctrl_ops,
+						ctrl_cfg->id,
+						ctrl_cfg->min,
+						ctrl_cfg->max,
+						ctrl_cfg->step,
+						ctrl_cfg->def);
+
+		if (ctrl)
+			ctrl->flags |= ctrl_cfg->flags;
+
+		if (i <= STROBE_SOURCE)
+			v4l2_flash->ctrls[i] = ctrl;
+	}
+
+	kfree(ctrl_init_data);
+
+	if (v4l2_flash->hdl.error) {
+		ret = v4l2_flash->hdl.error;
+		goto error_free_handler;
+	}
+
+	v4l2_ctrl_handler_setup(&v4l2_flash->hdl);
+
+	v4l2_flash->sd.ctrl_handler = &v4l2_flash->hdl;
+
+	return 0;
+
+error_free_handler:
+	v4l2_ctrl_handler_free(&v4l2_flash->hdl);
+	return ret;
+}
+
+static int __sync_device_with_v4l2_controls(struct v4l2_flash *v4l2_flash)
+{
+	struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
+	struct v4l2_ctrl **ctrls = v4l2_flash->ctrls;
+	int ret = 0;
+
+	v4l2_flash_set_led_brightness(v4l2_flash, ctrls[TORCH_INTENSITY]);
+
+	if (ctrls[INDICATOR_INTENSITY])
+		v4l2_flash_set_led_brightness(v4l2_flash,
+						ctrls[INDICATOR_INTENSITY]);
+
+	if (ctrls[FLASH_TIMEOUT]) {
+		ret = led_set_flash_timeout(fled_cdev,
+					ctrls[FLASH_TIMEOUT]->val);
+		if (ret < 0)
+			return ret;
+	}
+
+	if (ctrls[FLASH_INTENSITY]) {
+		ret = led_set_flash_brightness(fled_cdev,
+					ctrls[FLASH_INTENSITY]->val);
+		if (ret < 0)
+			return ret;
+	}
+
+	/*
+	 * For some hardware arrangements setting strobe source may affect
+	 * torch mode. Synchronize strobe source setting only if not in torch
+	 * mode. For torch mode case it will get synchronized upon switching
+	 * to flash mode.
+	 */
+	if (ctrls[STROBE_SOURCE] &&
+	    ctrls[LED_MODE]->val != V4L2_FLASH_LED_MODE_TORCH)
+		ret = call_flash_op(v4l2_flash, external_strobe_set,
+					ctrls[STROBE_SOURCE]->val);
+
+	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 *fled_cdev = v4l2_flash->fled_cdev;
+	struct led_classdev *led_cdev = &fled_cdev->led_cdev;
+	struct led_classdev_flash *iled_cdev = v4l2_flash->iled_cdev;
+	struct led_classdev *led_cdev_ind = NULL;
+	int ret = 0;
+
+	if (!v4l2_fh_is_singular(&fh->vfh))
+		return 0;
+
+	mutex_lock(&led_cdev->led_access);
+
+	led_sysfs_disable(led_cdev);
+	led_trigger_remove(led_cdev);
+
+	mutex_unlock(&led_cdev->led_access);
+
+	if (iled_cdev) {
+		led_cdev_ind = &iled_cdev->led_cdev;
+
+		mutex_lock(&led_cdev_ind->led_access);
+
+		led_sysfs_disable(led_cdev_ind);
+		led_trigger_remove(led_cdev_ind);
+
+		mutex_unlock(&led_cdev_ind->led_access);
+	}
+
+	ret = __sync_device_with_v4l2_controls(v4l2_flash);
+	if (ret < 0)
+		goto out_sync_device;
+
+	return 0;
+out_sync_device:
+	mutex_lock(&led_cdev->led_access);
+	led_sysfs_enable(led_cdev);
+	mutex_unlock(&led_cdev->led_access);
+
+	if (led_cdev_ind) {
+		mutex_lock(&led_cdev_ind->led_access);
+		led_sysfs_enable(led_cdev_ind);
+		mutex_unlock(&led_cdev_ind->led_access);
+	}
+
+	return ret;
+}
+
+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 *fled_cdev = v4l2_flash->fled_cdev;
+	struct led_classdev *led_cdev = &fled_cdev->led_cdev;
+	struct led_classdev_flash *iled_cdev = v4l2_flash->iled_cdev;
+	int ret = 0;
+
+	if (!v4l2_fh_is_singular(&fh->vfh))
+		return 0;
+
+	mutex_lock(&led_cdev->led_access);
+
+	if (v4l2_flash->ctrls[STROBE_SOURCE])
+		ret = v4l2_ctrl_s_ctrl(v4l2_flash->ctrls[STROBE_SOURCE],
+				V4L2_FLASH_STROBE_SOURCE_SOFTWARE);
+	led_sysfs_enable(led_cdev);
+
+	mutex_unlock(&led_cdev->led_access);
+
+	if (iled_cdev) {
+		struct led_classdev *led_cdev_ind = &iled_cdev->led_cdev;
+
+		mutex_lock(&led_cdev_ind->led_access);
+		led_sysfs_enable(led_cdev_ind);
+		mutex_unlock(&led_cdev_ind->led_access);
+	}
+
+	return ret;
+}
+
+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,
+};
+
+struct v4l2_flash *v4l2_flash_init(
+	struct device *dev, struct device_node *of_node,
+	struct led_classdev_flash *fled_cdev,
+	struct led_classdev_flash *iled_cdev,
+	const struct v4l2_flash_ops *ops,
+	struct v4l2_flash_config *config)
+{
+	struct v4l2_flash *v4l2_flash;
+	struct led_classdev *led_cdev;
+	struct v4l2_subdev *sd;
+	int ret;
+
+	if (!fled_cdev || !ops || !config)
+		return ERR_PTR(-EINVAL);
+
+	led_cdev = &fled_cdev->led_cdev;
+
+	v4l2_flash = devm_kzalloc(led_cdev->dev, sizeof(*v4l2_flash),
+					GFP_KERNEL);
+	if (!v4l2_flash)
+		return ERR_PTR(-ENOMEM);
+
+	sd = &v4l2_flash->sd;
+	v4l2_flash->fled_cdev = fled_cdev;
+	v4l2_flash->iled_cdev = iled_cdev;
+	v4l2_flash->ops = ops;
+	sd->dev = dev;
+	sd->of_node = of_node;
+	v4l2_subdev_init(sd, &v4l2_flash_subdev_ops);
+	sd->internal_ops = &v4l2_flash_subdev_internal_ops;
+	sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+	strlcpy(sd->name, config->dev_name, sizeof(sd->name));
+
+	ret = media_entity_init(&sd->entity, 0, NULL, 0);
+	if (ret < 0)
+		return ERR_PTR(ret);
+
+	sd->entity.type = MEDIA_ENT_T_V4L2_SUBDEV_FLASH;
+
+	ret = v4l2_flash_init_controls(v4l2_flash, config);
+	if (ret < 0)
+		goto err_init_controls;
+
+	if (sd->of_node)
+		of_node_get(sd->of_node);
+	else
+		of_node_get(led_cdev->dev->of_node);
+
+	ret = v4l2_async_register_subdev(sd);
+	if (ret < 0)
+		goto err_async_register_sd;
+
+	return v4l2_flash;
+
+err_async_register_sd:
+	of_node_put(led_cdev->dev->of_node);
+	v4l2_ctrl_handler_free(sd->ctrl_handler);
+err_init_controls:
+	media_entity_cleanup(&sd->entity);
+
+	return ERR_PTR(ret);
+}
+EXPORT_SYMBOL_GPL(v4l2_flash_init);
+
+void v4l2_flash_release(struct v4l2_flash *v4l2_flash)
+{
+	struct v4l2_subdev *sd;
+	struct led_classdev *led_cdev;
+
+	if (IS_ERR_OR_NULL(v4l2_flash))
+		return;
+
+	sd = &v4l2_flash->sd;
+	led_cdev = &v4l2_flash->fled_cdev->led_cdev;
+
+	v4l2_async_unregister_subdev(sd);
+
+	if (sd->of_node)
+		of_node_put(sd->of_node);
+	else
+		of_node_put(led_cdev->dev->of_node);
+
+	v4l2_ctrl_handler_free(sd->ctrl_handler);
+	media_entity_cleanup(&sd->entity);
+}
+EXPORT_SYMBOL_GPL(v4l2_flash_release);
+
+MODULE_AUTHOR("Jacek Anaszewski <j.anaszewski@samsung.com>");
+MODULE_DESCRIPTION("V4L2 Flash sub-device helpers");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
index aa407cb5f..85de4557f 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -142,6 +142,7 @@ const char *v4l2_field_names[] = {
 EXPORT_SYMBOL(v4l2_field_names);
 
 const char *v4l2_type_names[] = {
+	[0]				   = "0",
 	[V4L2_BUF_TYPE_VIDEO_CAPTURE]      = "vid-cap",
 	[V4L2_BUF_TYPE_VIDEO_OVERLAY]      = "vid-overlay",
 	[V4L2_BUF_TYPE_VIDEO_OUTPUT]       = "vid-out",
@@ -257,7 +258,8 @@ static void v4l_print_format(const void *arg, bool write_only)
 		pr_cont(", width=%u, height=%u, "
 			"pixelformat=%c%c%c%c, field=%s, "
 			"bytesperline=%u, sizeimage=%u, colorspace=%d, "
-			"flags=0x%x, ycbcr_enc=%u, quantization=%u\n",
+			"flags=0x%x, ycbcr_enc=%u, quantization=%u, "
+			"xfer_func=%u\n",
 			pix->width, pix->height,
 			(pix->pixelformat & 0xff),
 			(pix->pixelformat >>  8) & 0xff,
@@ -266,7 +268,7 @@ static void v4l_print_format(const void *arg, bool write_only)
 			prt_names(pix->field, v4l2_field_names),
 			pix->bytesperline, pix->sizeimage,
 			pix->colorspace, pix->flags, pix->ycbcr_enc,
-			pix->quantization);
+			pix->quantization, pix->xfer_func);
 		break;
 	case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
 	case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
@@ -274,7 +276,7 @@ static void v4l_print_format(const void *arg, bool write_only)
 		pr_cont(", width=%u, height=%u, "
 			"format=%c%c%c%c, field=%s, "
 			"colorspace=%d, num_planes=%u, flags=0x%x, "
-			"ycbcr_enc=%u, quantization=%u\n",
+			"ycbcr_enc=%u, quantization=%u, xfer_func=%u\n",
 			mp->width, mp->height,
 			(mp->pixelformat & 0xff),
 			(mp->pixelformat >>  8) & 0xff,
@@ -282,7 +284,7 @@ static void v4l_print_format(const void *arg, bool write_only)
 			(mp->pixelformat >> 24) & 0xff,
 			prt_names(mp->field, v4l2_field_names),
 			mp->colorspace, mp->num_planes, mp->flags,
-			mp->ycbcr_enc, mp->quantization);
+			mp->ycbcr_enc, mp->quantization, mp->xfer_func);
 		for (i = 0; i < mp->num_planes; i++)
 			printk(KERN_DEBUG "plane %u: bytesperline=%u sizeimage=%u\n", i,
 					mp->plane_fmt[i].bytesperline,
@@ -1103,6 +1105,183 @@ static int v4l_enumoutput(const struct v4l2_ioctl_ops *ops,
 	return ops->vidioc_enum_output(file, fh, p);
 }
 
+static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
+{
+	const unsigned sz = sizeof(fmt->description);
+	const char *descr = NULL;
+	u32 flags = 0;
+
+	/*
+	 * We depart from the normal coding style here since the descriptions
+	 * should be aligned so it is easy to see which descriptions will be
+	 * longer than 31 characters (the max length for a description).
+	 * And frankly, this is easier to read anyway.
+	 *
+	 * Note that gcc will use O(log N) comparisons to find the right case.
+	 */
+	switch (fmt->pixelformat) {
+	/* Max description length mask:	descr = "0123456789012345678901234567890" */
+	case V4L2_PIX_FMT_RGB332:	descr = "8-bit RGB 3-3-2"; break;
+	case V4L2_PIX_FMT_RGB444:	descr = "16-bit A/XRGB 4-4-4-4"; break;
+	case V4L2_PIX_FMT_ARGB444:	descr = "16-bit ARGB 4-4-4-4"; break;
+	case V4L2_PIX_FMT_XRGB444:	descr = "16-bit XRGB 4-4-4-4"; break;
+	case V4L2_PIX_FMT_RGB555:	descr = "16-bit A/XRGB 1-5-5-5"; break;
+	case V4L2_PIX_FMT_ARGB555:	descr = "16-bit ARGB 1-5-5-5"; break;
+	case V4L2_PIX_FMT_XRGB555:	descr = "16-bit XRGB 1-5-5-5"; break;
+	case V4L2_PIX_FMT_RGB565:	descr = "16-bit RGB 5-6-5"; break;
+	case V4L2_PIX_FMT_RGB555X:	descr = "16-bit A/XRGB 1-5-5-5 BE"; break;
+	case V4L2_PIX_FMT_ARGB555X:	descr = "16-bit ARGB 1-5-5-5 BE"; break;
+	case V4L2_PIX_FMT_XRGB555X:	descr = "16-bit XRGB 1-5-5-5 BE"; break;
+	case V4L2_PIX_FMT_RGB565X:	descr = "16-bit RGB 5-6-5 BE"; break;
+	case V4L2_PIX_FMT_BGR666:	descr = "18-bit BGRX 6-6-6-14"; break;
+	case V4L2_PIX_FMT_BGR24:	descr = "24-bit BGR 8-8-8"; break;
+	case V4L2_PIX_FMT_RGB24:	descr = "24-bit RGB 8-8-8"; break;
+	case V4L2_PIX_FMT_BGR32:	descr = "32-bit BGRA/X 8-8-8-8"; break;
+	case V4L2_PIX_FMT_ABGR32:	descr = "32-bit BGRA 8-8-8-8"; break;
+	case V4L2_PIX_FMT_XBGR32:	descr = "32-bit BGRX 8-8-8-8"; break;
+	case V4L2_PIX_FMT_RGB32:	descr = "32-bit A/XRGB 8-8-8-8"; break;
+	case V4L2_PIX_FMT_ARGB32:	descr = "32-bit ARGB 8-8-8-8"; break;
+	case V4L2_PIX_FMT_XRGB32:	descr = "32-bit XRGB 8-8-8-8"; break;
+	case V4L2_PIX_FMT_GREY:		descr = "8-bit Greyscale"; break;
+	case V4L2_PIX_FMT_Y4:		descr = "4-bit Greyscale"; break;
+	case V4L2_PIX_FMT_Y6:		descr = "6-bit Greyscale"; break;
+	case V4L2_PIX_FMT_Y10:		descr = "10-bit Greyscale"; break;
+	case V4L2_PIX_FMT_Y12:		descr = "12-bit Greyscale"; break;
+	case V4L2_PIX_FMT_Y16:		descr = "16-bit Greyscale"; break;
+	case V4L2_PIX_FMT_Y16_BE:	descr = "16-bit Greyscale BE"; break;
+	case V4L2_PIX_FMT_Y10BPACK:	descr = "10-bit Greyscale (Packed)"; break;
+	case V4L2_PIX_FMT_PAL8:		descr = "8-bit Palette"; break;
+	case V4L2_PIX_FMT_UV8:		descr = "8-bit Chrominance UV 4-4"; break;
+	case V4L2_PIX_FMT_YVU410:	descr = "Planar YVU 4:1:0"; break;
+	case V4L2_PIX_FMT_YVU420:	descr = "Planar YVU 4:2:0"; break;
+	case V4L2_PIX_FMT_YUYV:		descr = "YUYV 4:2:2"; break;
+	case V4L2_PIX_FMT_YYUV:		descr = "YYUV 4:2:2"; break;
+	case V4L2_PIX_FMT_YVYU:		descr = "YVYU 4:2:2"; break;
+	case V4L2_PIX_FMT_UYVY:		descr = "UYVY 4:2:2"; break;
+	case V4L2_PIX_FMT_VYUY:		descr = "VYUY 4:2:2"; break;
+	case V4L2_PIX_FMT_YUV422P:	descr = "Planar YVU 4:2:2"; break;
+	case V4L2_PIX_FMT_YUV411P:	descr = "Planar YUV 4:1:1"; break;
+	case V4L2_PIX_FMT_Y41P:		descr = "YUV 4:1:1 (Packed)"; break;
+	case V4L2_PIX_FMT_YUV444:	descr = "16-bit A/XYUV 4-4-4-4"; break;
+	case V4L2_PIX_FMT_YUV555:	descr = "16-bit A/XYUV 1-5-5-5"; break;
+	case V4L2_PIX_FMT_YUV565:	descr = "16-bit YUV 5-6-5"; break;
+	case V4L2_PIX_FMT_YUV32:	descr = "32-bit A/XYUV 8-8-8-8"; break;
+	case V4L2_PIX_FMT_YUV410:	descr = "Planar YUV 4:1:0"; break;
+	case V4L2_PIX_FMT_YUV420:	descr = "Planar YUV 4:2:0"; break;
+	case V4L2_PIX_FMT_HI240:	descr = "8-bit Dithered RGB (BTTV)"; break;
+	case V4L2_PIX_FMT_HM12:		descr = "YUV 4:2:0 (16x16 Macroblocks)"; break;
+	case V4L2_PIX_FMT_M420:		descr = "YUV 4:2:0 (M420)"; break;
+	case V4L2_PIX_FMT_NV12:		descr = "Y/CbCr 4:2:0"; break;
+	case V4L2_PIX_FMT_NV21:		descr = "Y/CrCb 4:2:0"; break;
+	case V4L2_PIX_FMT_NV16:		descr = "Y/CbCr 4:2:2"; break;
+	case V4L2_PIX_FMT_NV61:		descr = "Y/CrCb 4:2:2"; break;
+	case V4L2_PIX_FMT_NV24:		descr = "Y/CbCr 4:4:4"; break;
+	case V4L2_PIX_FMT_NV42:		descr = "Y/CrCb 4:4:4"; break;
+	case V4L2_PIX_FMT_NV12M:	descr = "Y/CbCr 4:2:0 (N-C)"; break;
+	case V4L2_PIX_FMT_NV21M:	descr = "Y/CrCb 4:2:0 (N-C)"; break;
+	case V4L2_PIX_FMT_NV16M:	descr = "Y/CbCr 4:2:2 (N-C)"; break;
+	case V4L2_PIX_FMT_NV61M:	descr = "Y/CrCb 4:2:2 (N-C)"; break;
+	case V4L2_PIX_FMT_NV12MT:	descr = "Y/CbCr 4:2:0 (64x32 MB, N-C)"; break;
+	case V4L2_PIX_FMT_NV12MT_16X16:	descr = "Y/CbCr 4:2:0 (16x16 MB, N-C)"; break;
+	case V4L2_PIX_FMT_YUV420M:	descr = "Planar YUV 4:2:0 (N-C)"; break;
+	case V4L2_PIX_FMT_YVU420M:	descr = "Planar YVU 4:2:0 (N-C)"; break;
+	case V4L2_PIX_FMT_SBGGR8:	descr = "8-bit Bayer BGBG/GRGR"; break;
+	case V4L2_PIX_FMT_SGBRG8:	descr = "8-bit Bayer GBGB/RGRG"; break;
+	case V4L2_PIX_FMT_SGRBG8:	descr = "8-bit Bayer GRGR/BGBG"; break;
+	case V4L2_PIX_FMT_SRGGB8:	descr = "8-bit Bayer RGRG/GBGB"; break;
+	case V4L2_PIX_FMT_SBGGR10:	descr = "10-bit Bayer BGBG/GRGR"; break;
+	case V4L2_PIX_FMT_SGBRG10:	descr = "10-bit Bayer GBGB/RGRG"; break;
+	case V4L2_PIX_FMT_SGRBG10:	descr = "10-bit Bayer GRGR/BGBG"; break;
+	case V4L2_PIX_FMT_SRGGB10:	descr = "10-bit Bayer RGRG/GBGB"; break;
+	case V4L2_PIX_FMT_SBGGR12:	descr = "12-bit Bayer BGBG/GRGR"; break;
+	case V4L2_PIX_FMT_SGBRG12:	descr = "12-bit Bayer GBGB/RGRG"; break;
+	case V4L2_PIX_FMT_SGRBG12:	descr = "12-bit Bayer GRGR/BGBG"; break;
+	case V4L2_PIX_FMT_SRGGB12:	descr = "12-bit Bayer RGRG/GBGB"; break;
+	case V4L2_PIX_FMT_SBGGR10P:	descr = "10-bit Bayer BGBG/GRGR Packed"; break;
+	case V4L2_PIX_FMT_SGBRG10P:	descr = "10-bit Bayer GBGB/RGRG Packed"; break;
+	case V4L2_PIX_FMT_SGRBG10P:	descr = "10-bit Bayer GRGR/BGBG Packed"; break;
+	case V4L2_PIX_FMT_SRGGB10P:	descr = "10-bit Bayer RGRG/GBGB Packed"; break;
+	case V4L2_PIX_FMT_SBGGR10ALAW8:	descr = "8-bit Bayer BGBG/GRGR (A-law)"; break;
+	case V4L2_PIX_FMT_SGBRG10ALAW8:	descr = "8-bit Bayer GBGB/RGRG (A-law)"; break;
+	case V4L2_PIX_FMT_SGRBG10ALAW8:	descr = "8-bit Bayer GRGR/BGBG (A-law)"; break;
+	case V4L2_PIX_FMT_SRGGB10ALAW8:	descr = "8-bit Bayer RGRG/GBGB (A-law)"; break;
+	case V4L2_PIX_FMT_SBGGR10DPCM8:	descr = "8-bit Bayer BGBG/GRGR (DPCM)"; break;
+	case V4L2_PIX_FMT_SGBRG10DPCM8:	descr = "8-bit Bayer GBGB/RGRG (DPCM)"; break;
+	case V4L2_PIX_FMT_SGRBG10DPCM8:	descr = "8-bit Bayer GRGR/BGBG (DPCM)"; break;
+	case V4L2_PIX_FMT_SRGGB10DPCM8:	descr = "8-bit Bayer RGRG/GBGB (DPCM)"; break;
+	case V4L2_PIX_FMT_SBGGR16:	descr = "16-bit Bayer BGBG/GRGR (Exp.)"; break;
+	case V4L2_PIX_FMT_SN9C20X_I420:	descr = "GSPCA SN9C20X I420"; break;
+	case V4L2_PIX_FMT_SPCA501:	descr = "GSPCA SPCA501"; break;
+	case V4L2_PIX_FMT_SPCA505:	descr = "GSPCA SPCA505"; break;
+	case V4L2_PIX_FMT_SPCA508:	descr = "GSPCA SPCA508"; break;
+	case V4L2_PIX_FMT_STV0680:	descr = "GSPCA STV0680"; break;
+	case V4L2_PIX_FMT_TM6000:	descr = "A/V + VBI Mux Packet"; break;
+	case V4L2_PIX_FMT_CIT_YYVYUY:	descr = "GSPCA CIT YYVYUY"; break;
+	case V4L2_PIX_FMT_KONICA420:	descr = "GSPCA KONICA420"; break;
+	case V4L2_SDR_FMT_CU8:		descr = "Complex U8"; break;
+	case V4L2_SDR_FMT_CU16LE:	descr = "Complex U16LE"; break;
+	case V4L2_SDR_FMT_CS8:		descr = "Complex S8"; break;
+	case V4L2_SDR_FMT_CS14LE:	descr = "Complex S14LE"; break;
+	case V4L2_SDR_FMT_RU12LE:	descr = "Real U12LE"; break;
+
+	default:
+		/* Compressed formats */
+		flags = V4L2_FMT_FLAG_COMPRESSED;
+		switch (fmt->pixelformat) {
+		/* Max description length mask:	descr = "0123456789012345678901234567890" */
+		case V4L2_PIX_FMT_MJPEG:	descr = "Motion-JPEG"; break;
+		case V4L2_PIX_FMT_JPEG:		descr = "JFIF JPEG"; break;
+		case V4L2_PIX_FMT_DV:		descr = "1394"; break;
+		case V4L2_PIX_FMT_MPEG:		descr = "MPEG-1/2/4"; break;
+		case V4L2_PIX_FMT_H264:		descr = "H.264"; break;
+		case V4L2_PIX_FMT_H264_NO_SC:	descr = "H.264 (No Start Codes)"; break;
+		case V4L2_PIX_FMT_H264_MVC:	descr = "H.264 MVC"; break;
+		case V4L2_PIX_FMT_H263:		descr = "H.263"; break;
+		case V4L2_PIX_FMT_MPEG1:	descr = "MPEG-1 ES"; break;
+		case V4L2_PIX_FMT_MPEG2:	descr = "MPEG-2 ES"; break;
+		case V4L2_PIX_FMT_MPEG4:	descr = "MPEG-4 part 2 ES"; break;
+		case V4L2_PIX_FMT_XVID:		descr = "Xvid"; break;
+		case V4L2_PIX_FMT_VC1_ANNEX_G:	descr = "VC-1 (SMPTE 412M Annex G)"; break;
+		case V4L2_PIX_FMT_VC1_ANNEX_L:	descr = "VC-1 (SMPTE 412M Annex L)"; break;
+		case V4L2_PIX_FMT_VP8:		descr = "VP8"; break;
+		case V4L2_PIX_FMT_CPIA1:	descr = "GSPCA CPiA YUV"; break;
+		case V4L2_PIX_FMT_WNVA:		descr = "WNVA"; break;
+		case V4L2_PIX_FMT_SN9C10X:	descr = "GSPCA SN9C10X"; break;
+		case V4L2_PIX_FMT_PWC1:		descr = "Raw Philips Webcam Type (Old)"; break;
+		case V4L2_PIX_FMT_PWC2:		descr = "Raw Philips Webcam Type (New)"; break;
+		case V4L2_PIX_FMT_ET61X251:	descr = "GSPCA ET61X251"; break;
+		case V4L2_PIX_FMT_SPCA561:	descr = "GSPCA SPCA561"; break;
+		case V4L2_PIX_FMT_PAC207:	descr = "GSPCA PAC207"; break;
+		case V4L2_PIX_FMT_MR97310A:	descr = "GSPCA MR97310A"; break;
+		case V4L2_PIX_FMT_JL2005BCD:	descr = "GSPCA JL2005BCD"; break;
+		case V4L2_PIX_FMT_SN9C2028:	descr = "GSPCA SN9C2028"; break;
+		case V4L2_PIX_FMT_SQ905C:	descr = "GSPCA SQ905C"; break;
+		case V4L2_PIX_FMT_PJPG:		descr = "GSPCA PJPG"; break;
+		case V4L2_PIX_FMT_OV511:	descr = "GSPCA OV511"; break;
+		case V4L2_PIX_FMT_OV518:	descr = "GSPCA OV518"; break;
+		case V4L2_PIX_FMT_JPGL:		descr = "JPEG Lite"; break;
+		case V4L2_PIX_FMT_SE401:	descr = "GSPCA SE401"; break;
+		case V4L2_PIX_FMT_S5C_UYVY_JPG:	descr = "S5C73MX interleaved UYVY/JPEG"; break;
+		default:
+			WARN(1, "Unknown pixelformat 0x%08x\n", fmt->pixelformat);
+			if (fmt->description[0])
+				return;
+			flags = 0;
+			snprintf(fmt->description, sz, "%c%c%c%c%s",
+					(char)(fmt->pixelformat & 0x7f),
+					(char)((fmt->pixelformat >> 8) & 0x7f),
+					(char)((fmt->pixelformat >> 16) & 0x7f),
+					(char)((fmt->pixelformat >> 24) & 0x7f),
+					(fmt->pixelformat & (1 << 31)) ? "-BE" : "");
+			break;
+		}
+	}
+
+	if (descr)
+		WARN_ON(strlcpy(fmt->description, descr, sz) >= sz);
+	fmt->flags = flags;
+}
+
 static int v4l_enum_fmt(const struct v4l2_ioctl_ops *ops,
 				struct file *file, void *fh, void *arg)
 {
@@ -1112,34 +1291,43 @@ static int v4l_enum_fmt(const struct v4l2_ioctl_ops *ops,
 	bool is_sdr = vfd->vfl_type == VFL_TYPE_SDR;
 	bool is_rx = vfd->vfl_dir != VFL_DIR_TX;
 	bool is_tx = vfd->vfl_dir != VFL_DIR_RX;
+	int ret = -EINVAL;
 
 	switch (p->type) {
 	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 		if (unlikely(!is_rx || !is_vid || !ops->vidioc_enum_fmt_vid_cap))
 			break;
-		return ops->vidioc_enum_fmt_vid_cap(file, fh, arg);
+		ret = ops->vidioc_enum_fmt_vid_cap(file, fh, arg);
+		break;
 	case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
 		if (unlikely(!is_rx || !is_vid || !ops->vidioc_enum_fmt_vid_cap_mplane))
 			break;
-		return ops->vidioc_enum_fmt_vid_cap_mplane(file, fh, arg);
+		ret = ops->vidioc_enum_fmt_vid_cap_mplane(file, fh, arg);
+		break;
 	case V4L2_BUF_TYPE_VIDEO_OVERLAY:
 		if (unlikely(!is_rx || !is_vid || !ops->vidioc_enum_fmt_vid_overlay))
 			break;
-		return ops->vidioc_enum_fmt_vid_overlay(file, fh, arg);
+		ret = ops->vidioc_enum_fmt_vid_overlay(file, fh, arg);
+		break;
 	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
 		if (unlikely(!is_tx || !is_vid || !ops->vidioc_enum_fmt_vid_out))
 			break;
-		return ops->vidioc_enum_fmt_vid_out(file, fh, arg);
+		ret = ops->vidioc_enum_fmt_vid_out(file, fh, arg);
+		break;
 	case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
 		if (unlikely(!is_tx || !is_vid || !ops->vidioc_enum_fmt_vid_out_mplane))
 			break;
-		return ops->vidioc_enum_fmt_vid_out_mplane(file, fh, arg);
+		ret = ops->vidioc_enum_fmt_vid_out_mplane(file, fh, arg);
+		break;
 	case V4L2_BUF_TYPE_SDR_CAPTURE:
 		if (unlikely(!is_rx || !is_sdr || !ops->vidioc_enum_fmt_sdr_cap))
 			break;
-		return ops->vidioc_enum_fmt_sdr_cap(file, fh, arg);
+		ret = ops->vidioc_enum_fmt_sdr_cap(file, fh, arg);
+		break;
 	}
-	return -EINVAL;
+	if (ret == 0)
+		v4l_fill_fmtdesc(p);
+	return ret;
 }
 
 static int v4l_g_fmt(const struct v4l2_ioctl_ops *ops,
@@ -1618,6 +1806,8 @@ static int v4l_create_bufs(const struct v4l2_ioctl_ops *ops,
 	if (ret)
 		return ret;
 
+	CLEAR_AFTER_FIELD(create, format);
+
 	v4l_sanitize_format(&create->format);
 
 	ret = ops->vidioc_create_bufs(file, fh, create);
@@ -2354,7 +2544,7 @@ static long __video_do_ioctl(struct file *file,
 	if (v4l2_is_known_ioctl(cmd)) {
 		info = &v4l2_ioctls[_IOC_NR(cmd)];
 
-	        if (!test_bit(_IOC_NR(cmd), vfd->valid_ioctls) &&
+		if (!test_bit(_IOC_NR(cmd), vfd->valid_ioctls) &&
 		    !((info->flags & INFO_FL_CTRL) && vfh && vfh->ctrl_handler))
 			goto done;
 
diff --git a/drivers/media/v4l2-core/v4l2-mem2mem.c b/drivers/media/v4l2-core/v4l2-mem2mem.c
index 73824a5ad..dc853e57f 100644
--- a/drivers/media/v4l2-core/v4l2-mem2mem.c
+++ b/drivers/media/v4l2-core/v4l2-mem2mem.c
@@ -427,6 +427,25 @@ int v4l2_m2m_dqbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 EXPORT_SYMBOL_GPL(v4l2_m2m_dqbuf);
 
 /**
+ * v4l2_m2m_prepare_buf() - prepare a source or destination buffer, depending on
+ * the type
+ */
+int v4l2_m2m_prepare_buf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
+			 struct v4l2_buffer *buf)
+{
+	struct vb2_queue *vq;
+	int ret;
+
+	vq = v4l2_m2m_get_vq(m2m_ctx, buf->type);
+	ret = vb2_prepare_buf(vq, buf);
+	if (!ret)
+		v4l2_m2m_try_schedule(m2m_ctx);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(v4l2_m2m_prepare_buf);
+
+/**
  * v4l2_m2m_create_bufs() - create a source or destination buffer, depending
  * on the type
  */
@@ -564,8 +583,16 @@ unsigned int v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 
 	if (list_empty(&src_q->done_list))
 		poll_wait(file, &src_q->done_wq, wait);
-	if (list_empty(&dst_q->done_list))
+	if (list_empty(&dst_q->done_list)) {
+		/*
+		 * If the last buffer was dequeued from the capture queue,
+		 * return immediately. DQBUF will return -EPIPE.
+		 */
+		if (dst_q->last_buffer_dequeued)
+			return rc | POLLIN | POLLRDNORM;
+
 		poll_wait(file, &dst_q->done_wq, wait);
+	}
 
 	if (m2m_ctx->m2m_dev->m2m_ops->lock)
 		m2m_ctx->m2m_dev->m2m_ops->lock(m2m_ctx->priv);
@@ -803,6 +830,15 @@ int v4l2_m2m_ioctl_dqbuf(struct file *file, void *priv,
 }
 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_dqbuf);
 
+int v4l2_m2m_ioctl_prepare_buf(struct file *file, void *priv,
+			       struct v4l2_buffer *buf)
+{
+	struct v4l2_fh *fh = file->private_data;
+
+	return v4l2_m2m_prepare_buf(file, fh->m2m_ctx, buf);
+}
+EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_prepare_buf);
+
 int v4l2_m2m_ioctl_expbuf(struct file *file, void *priv,
 				struct v4l2_exportbuffer *eb)
 {
diff --git a/drivers/media/v4l2-core/v4l2-of.c b/drivers/media/v4l2-core/v4l2-of.c
index 83143d39d..b27cbb1f5 100644
--- a/drivers/media/v4l2-core/v4l2-of.c
+++ b/drivers/media/v4l2-core/v4l2-of.c
@@ -14,6 +14,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/slab.h>
 #include <linux/string.h>
 #include <linux/types.h>
 
@@ -92,10 +93,6 @@ static void v4l2_of_parse_parallel_bus(const struct device_node *node,
 		flags |= v ? V4L2_MBUS_VSYNC_ACTIVE_HIGH :
 			V4L2_MBUS_VSYNC_ACTIVE_LOW;
 
-	if (!of_property_read_u32(node, "pclk-sample", &v))
-		flags |= v ? V4L2_MBUS_PCLK_SAMPLE_RISING :
-			V4L2_MBUS_PCLK_SAMPLE_FALLING;
-
 	if (!of_property_read_u32(node, "field-even-active", &v))
 		flags |= v ? V4L2_MBUS_FIELD_EVEN_HIGH :
 			V4L2_MBUS_FIELD_EVEN_LOW;
@@ -104,6 +101,10 @@ static void v4l2_of_parse_parallel_bus(const struct device_node *node,
 	else
 		endpoint->bus_type = V4L2_MBUS_BT656;
 
+	if (!of_property_read_u32(node, "pclk-sample", &v))
+		flags |= v ? V4L2_MBUS_PCLK_SAMPLE_RISING :
+			V4L2_MBUS_PCLK_SAMPLE_FALLING;
+
 	if (!of_property_read_u32(node, "data-active", &v))
 		flags |= v ? V4L2_MBUS_DATA_ACTIVE_HIGH :
 			V4L2_MBUS_DATA_ACTIVE_LOW;
@@ -141,6 +142,10 @@ static void v4l2_of_parse_parallel_bus(const struct device_node *node,
  * V4L2_MBUS_CSI2_CONTINUOUS_CLOCK flag.
  * The caller should hold a reference to @node.
  *
+ * NOTE: This function does not parse properties the size of which is
+ * variable without a low fixed limit. Please use
+ * v4l2_of_alloc_parse_endpoint() in new drivers instead.
+ *
  * Return: 0.
  */
 int v4l2_of_parse_endpoint(const struct device_node *node,
@@ -149,8 +154,9 @@ int v4l2_of_parse_endpoint(const struct device_node *node,
 	int rval;
 
 	of_graph_parse_endpoint(node, &endpoint->base);
-	endpoint->bus_type = 0;
-	memset(&endpoint->bus, 0, sizeof(endpoint->bus));
+	/* Zero fields from bus_type to until the end */
+	memset(&endpoint->bus_type, 0, sizeof(*endpoint) -
+	       offsetof(typeof(*endpoint), bus_type));
 
 	rval = v4l2_of_parse_csi_bus(node, endpoint);
 	if (rval)
@@ -166,6 +172,88 @@ int v4l2_of_parse_endpoint(const struct device_node *node,
 }
 EXPORT_SYMBOL(v4l2_of_parse_endpoint);
 
+/*
+ * v4l2_of_free_endpoint() - free the endpoint acquired by
+ * v4l2_of_alloc_parse_endpoint()
+ * @endpoint - the endpoint the resources of which are to be released
+ *
+ * It is safe to call this function with NULL argument or on an
+ * endpoint the parsing of which failed.
+ */
+void v4l2_of_free_endpoint(struct v4l2_of_endpoint *endpoint)
+{
+	if (IS_ERR_OR_NULL(endpoint))
+		return;
+
+	kfree(endpoint->link_frequencies);
+	kfree(endpoint);
+}
+EXPORT_SYMBOL(v4l2_of_free_endpoint);
+
+/**
+ * v4l2_of_alloc_parse_endpoint() - parse all endpoint node properties
+ * @node: pointer to endpoint device_node
+ *
+ * All properties are optional. If none are found, we don't set any flags.
+ * This means the port has a static configuration and no properties have
+ * to be specified explicitly.
+ * If any properties that identify the bus as parallel are found and
+ * slave-mode isn't set, we set V4L2_MBUS_MASTER. Similarly, if we recognise
+ * the bus as serial CSI-2 and clock-noncontinuous isn't set, we set the
+ * V4L2_MBUS_CSI2_CONTINUOUS_CLOCK flag.
+ * The caller should hold a reference to @node.
+ *
+ * v4l2_of_alloc_parse_endpoint() has two important differences to
+ * v4l2_of_parse_endpoint():
+ *
+ * 1. It also parses variable size data and
+ *
+ * 2. The memory it has allocated to store the variable size data must
+ *    be freed using v4l2_of_free_endpoint() when no longer needed.
+ *
+ * Return: Pointer to v4l2_of_endpoint if successful, on error a
+ * negative error code.
+ */
+struct v4l2_of_endpoint *v4l2_of_alloc_parse_endpoint(
+	const struct device_node *node)
+{
+	struct v4l2_of_endpoint *endpoint;
+	int len;
+	int rval;
+
+	endpoint = kzalloc(sizeof(*endpoint), GFP_KERNEL);
+	if (!endpoint)
+		return ERR_PTR(-ENOMEM);
+
+	rval = v4l2_of_parse_endpoint(node, endpoint);
+	if (rval < 0)
+		goto out_err;
+
+	if (of_get_property(node, "link-frequencies", &len)) {
+		endpoint->link_frequencies = kmalloc(len, GFP_KERNEL);
+		if (!endpoint->link_frequencies) {
+			rval = -ENOMEM;
+			goto out_err;
+		}
+
+		endpoint->nr_of_link_frequencies =
+			len / sizeof(*endpoint->link_frequencies);
+
+		rval = of_property_read_u64_array(
+			node, "link-frequencies", endpoint->link_frequencies,
+			endpoint->nr_of_link_frequencies);
+		if (rval < 0)
+			goto out_err;
+	}
+
+	return endpoint;
+
+out_err:
+	v4l2_of_free_endpoint(endpoint);
+	return ERR_PTR(rval);
+}
+EXPORT_SYMBOL(v4l2_of_alloc_parse_endpoint);
+
 /**
  * v4l2_of_parse_link() - parse a link between two endpoints
  * @node: pointer to the endpoint at the local end of the link
diff --git a/drivers/media/v4l2-core/videobuf2-core.c b/drivers/media/v4l2-core/videobuf2-core.c
index cf9d644a8..a14c428f7 100644
--- a/drivers/media/v4l2-core/videobuf2-core.c
+++ b/drivers/media/v4l2-core/videobuf2-core.c
@@ -182,6 +182,7 @@ module_param(debug, int, 0644);
 				 V4L2_BUF_FLAG_KEYFRAME | V4L2_BUF_FLAG_TIMECODE)
 
 static void __vb2_queue_cancel(struct vb2_queue *q);
+static void __enqueue_in_driver(struct vb2_buffer *vb);
 
 /**
  * __vb2_buf_mem_alloc() - allocate video memory for the given buffer
@@ -714,6 +715,7 @@ static void __fill_v4l2_buffer(struct vb2_buffer *vb, struct v4l2_buffer *b)
 		break;
 	case VB2_BUF_STATE_PREPARING:
 	case VB2_BUF_STATE_DEQUEUED:
+	case VB2_BUF_STATE_REQUEUEING:
 		/* nothing */
 		break;
 	}
@@ -1153,8 +1155,9 @@ EXPORT_SYMBOL_GPL(vb2_plane_cookie);
 /**
  * vb2_buffer_done() - inform videobuf that an operation on a buffer is finished
  * @vb:		vb2_buffer returned from the driver
- * @state:	either VB2_BUF_STATE_DONE if the operation finished successfully
- *		or VB2_BUF_STATE_ERROR if the operation finished with an error.
+ * @state:	either VB2_BUF_STATE_DONE if the operation finished successfully,
+ *		VB2_BUF_STATE_ERROR if the operation finished with an error or
+ *		VB2_BUF_STATE_QUEUED if the driver wants to requeue buffers.
  *		If start_streaming fails then it should return buffers with state
  *		VB2_BUF_STATE_QUEUED to put them back into the queue.
  *
@@ -1180,7 +1183,8 @@ void vb2_buffer_done(struct vb2_buffer *vb, enum vb2_buffer_state state)
 
 	if (WARN_ON(state != VB2_BUF_STATE_DONE &&
 		    state != VB2_BUF_STATE_ERROR &&
-		    state != VB2_BUF_STATE_QUEUED))
+		    state != VB2_BUF_STATE_QUEUED &&
+		    state != VB2_BUF_STATE_REQUEUEING))
 		state = VB2_BUF_STATE_ERROR;
 
 #ifdef CONFIG_VIDEO_ADV_DEBUG
@@ -1197,19 +1201,30 @@ void vb2_buffer_done(struct vb2_buffer *vb, enum vb2_buffer_state state)
 	for (plane = 0; plane < vb->num_planes; ++plane)
 		call_void_memop(vb, finish, vb->planes[plane].mem_priv);
 
-	/* Add the buffer to the done buffers list */
 	spin_lock_irqsave(&q->done_lock, flags);
-	vb->state = state;
-	if (state != VB2_BUF_STATE_QUEUED)
+	if (state == VB2_BUF_STATE_QUEUED ||
+	    state == VB2_BUF_STATE_REQUEUEING) {
+		vb->state = VB2_BUF_STATE_QUEUED;
+	} else {
+		/* Add the buffer to the done buffers list */
 		list_add_tail(&vb->done_entry, &q->done_list);
+		vb->state = state;
+	}
 	atomic_dec(&q->owned_by_drv_count);
 	spin_unlock_irqrestore(&q->done_lock, flags);
 
-	if (state == VB2_BUF_STATE_QUEUED)
+	switch (state) {
+	case VB2_BUF_STATE_QUEUED:
 		return;
-
-	/* Inform any processes that may be waiting for buffers */
-	wake_up(&q->done_wq);
+	case VB2_BUF_STATE_REQUEUEING:
+		if (q->start_streaming_called)
+			__enqueue_in_driver(vb);
+		return;
+	default:
+		/* Inform any processes that may be waiting for buffers */
+		wake_up(&q->done_wq);
+		break;
+	}
 }
 EXPORT_SYMBOL_GPL(vb2_buffer_done);
 
@@ -1239,19 +1254,19 @@ EXPORT_SYMBOL_GPL(vb2_discard_done);
 
 static void vb2_warn_zero_bytesused(struct vb2_buffer *vb)
 {
-	static bool __check_once __read_mostly;
+	static bool check_once;
 
-	if (__check_once)
+	if (check_once)
 		return;
 
-	__check_once = true;
-	__WARN();
+	check_once = true;
+	WARN_ON(1);
 
-	pr_warn_once("use of bytesused == 0 is deprecated and will be removed in the future,\n");
+	pr_warn("use of bytesused == 0 is deprecated and will be removed in the future,\n");
 	if (vb->vb2_queue->allow_zero_bytesused)
-		pr_warn_once("use VIDIOC_DECODER_CMD(V4L2_DEC_CMD_STOP) instead.\n");
+		pr_warn("use VIDIOC_DECODER_CMD(V4L2_DEC_CMD_STOP) instead.\n");
 	else
-		pr_warn_once("use the actual size instead.\n");
+		pr_warn("use the actual size instead.\n");
 }
 
 /**
@@ -1958,6 +1973,11 @@ static int __vb2_wait_for_done_vb(struct vb2_queue *q, int nonblocking)
 			return -EIO;
 		}
 
+		if (q->last_buffer_dequeued) {
+			dprintk(3, "last buffer dequeued already, will not wait for buffers\n");
+			return -EPIPE;
+		}
+
 		if (!list_empty(&q->done_list)) {
 			/*
 			 * Found a buffer that we were waiting for.
@@ -2113,6 +2133,9 @@ static int vb2_internal_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool n
 	/* Remove from videobuf queue */
 	list_del(&vb->queued_entry);
 	q->queued_count--;
+	if (!V4L2_TYPE_IS_OUTPUT(q->type) &&
+	    vb->v4l2_buf.flags & V4L2_BUF_FLAG_LAST)
+		q->last_buffer_dequeued = true;
 	/* go back to dequeued state */
 	__vb2_dqbuf(vb);
 
@@ -2326,6 +2349,7 @@ static int vb2_internal_streamoff(struct vb2_queue *q, enum v4l2_buf_type type)
 	 */
 	__vb2_queue_cancel(q);
 	q->waiting_for_buffers = !V4L2_TYPE_IS_OUTPUT(q->type);
+	q->last_buffer_dequeued = false;
 
 	dprintk(3, "successful\n");
 	return 0;
@@ -2668,8 +2692,16 @@ unsigned int vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait)
 	if (V4L2_TYPE_IS_OUTPUT(q->type) && q->queued_count < q->num_buffers)
 		return res | POLLOUT | POLLWRNORM;
 
-	if (list_empty(&q->done_list))
+	if (list_empty(&q->done_list)) {
+		/*
+		 * If the last buffer was dequeued from a capture queue,
+		 * return immediately. DQBUF will return -EPIPE.
+		 */
+		if (q->last_buffer_dequeued)
+			return res | POLLIN | POLLRDNORM;
+
 		poll_wait(file, &q->done_wq, wait);
+	}
 
 	/*
 	 * Take first buffer available for dequeuing.
diff --git a/drivers/media/v4l2-core/videobuf2-dma-contig.c b/drivers/media/v4l2-core/videobuf2-dma-contig.c
index 644dec73d..94c1e6455 100644
--- a/drivers/media/v4l2-core/videobuf2-dma-contig.c
+++ b/drivers/media/v4l2-core/videobuf2-dma-contig.c
@@ -299,7 +299,6 @@ static struct sg_table *vb2_dc_dmabuf_ops_map(
 	/* stealing dmabuf mutex to serialize map/unmap operations */
 	struct mutex *lock = &db_attach->dmabuf->lock;
 	struct sg_table *sgt;
-	int ret;
 
 	mutex_lock(lock);
 
@@ -318,8 +317,9 @@ static struct sg_table *vb2_dc_dmabuf_ops_map(
 	}
 
 	/* mapping to the client with new direction */
-	ret = dma_map_sg(db_attach->dev, sgt->sgl, sgt->orig_nents, dma_dir);
-	if (ret <= 0) {
+	sgt->nents = dma_map_sg(db_attach->dev, sgt->sgl, sgt->orig_nents,
+				dma_dir);
+	if (!sgt->nents) {
 		pr_err("failed to map scatterlist\n");
 		mutex_unlock(lock);
 		return ERR_PTR(-EIO);
diff --git a/drivers/media/v4l2-core/videobuf2-dma-sg.c b/drivers/media/v4l2-core/videobuf2-dma-sg.c
index 45c708e46..7289b81bd 100644
--- a/drivers/media/v4l2-core/videobuf2-dma-sg.c
+++ b/drivers/media/v4l2-core/videobuf2-dma-sg.c
@@ -147,8 +147,9 @@ static void *vb2_dma_sg_alloc(void *alloc_ctx, unsigned long size,
 	 * No need to sync to the device, this will happen later when the
 	 * prepare() memop is called.
 	 */
-	if (dma_map_sg_attrs(buf->dev, sgt->sgl, sgt->nents,
-			     buf->dma_dir, &attrs) == 0)
+	sgt->nents = dma_map_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents,
+				      buf->dma_dir, &attrs);
+	if (!sgt->nents)
 		goto fail_map;
 
 	buf->handler.refcount = &buf->refcount;
@@ -187,7 +188,7 @@ static void vb2_dma_sg_put(void *buf_priv)
 		dma_set_attr(DMA_ATTR_SKIP_CPU_SYNC, &attrs);
 		dprintk(1, "%s: Freeing buffer of %d pages\n", __func__,
 			buf->num_pages);
-		dma_unmap_sg_attrs(buf->dev, sgt->sgl, sgt->nents,
+		dma_unmap_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents,
 				   buf->dma_dir, &attrs);
 		if (buf->vaddr)
 			vm_unmap_ram(buf->vaddr, buf->num_pages);
@@ -314,9 +315,11 @@ static void *vb2_dma_sg_get_userptr(void *alloc_ctx, unsigned long vaddr,
 	 * No need to sync to the device, this will happen later when the
 	 * prepare() memop is called.
 	 */
-	if (dma_map_sg_attrs(buf->dev, sgt->sgl, sgt->nents,
-			     buf->dma_dir, &attrs) == 0)
+	sgt->nents = dma_map_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents,
+				      buf->dma_dir, &attrs);
+	if (!sgt->nents)
 		goto userptr_fail_map;
+
 	return buf;
 
 userptr_fail_map:
@@ -351,7 +354,8 @@ static void vb2_dma_sg_put_userptr(void *buf_priv)
 
 	dprintk(1, "%s: Releasing userspace buffer of %d pages\n",
 	       __func__, buf->num_pages);
-	dma_unmap_sg_attrs(buf->dev, sgt->sgl, sgt->nents, buf->dma_dir, &attrs);
+	dma_unmap_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents, buf->dma_dir,
+			   &attrs);
 	if (buf->vaddr)
 		vm_unmap_ram(buf->vaddr, buf->num_pages);
 	sg_free_table(buf->dma_sgt);
@@ -502,7 +506,6 @@ static struct sg_table *vb2_dma_sg_dmabuf_ops_map(
 	/* stealing dmabuf mutex to serialize map/unmap operations */
 	struct mutex *lock = &db_attach->dmabuf->lock;
 	struct sg_table *sgt;
-	int ret;
 
 	mutex_lock(lock);
 
@@ -521,8 +524,9 @@ static struct sg_table *vb2_dma_sg_dmabuf_ops_map(
 	}
 
 	/* mapping to the client with new direction */
-	ret = dma_map_sg(db_attach->dev, sgt->sgl, sgt->orig_nents, dma_dir);
-	if (ret <= 0) {
+	sgt->nents = dma_map_sg(db_attach->dev, sgt->sgl, sgt->orig_nents,
+				dma_dir);
+	if (!sgt->nents) {
 		pr_err("failed to map scatterlist\n");
 		mutex_unlock(lock);
 		return ERR_PTR(-EIO);
diff --git a/drivers/media/v4l2-core/videobuf2-vmalloc.c b/drivers/media/v4l2-core/videobuf2-vmalloc.c
index 657ab302a..2fe4c27f5 100644
--- a/drivers/media/v4l2-core/videobuf2-vmalloc.c
+++ b/drivers/media/v4l2-core/videobuf2-vmalloc.c
@@ -287,7 +287,6 @@ static struct sg_table *vb2_vmalloc_dmabuf_ops_map(
 	/* stealing dmabuf mutex to serialize map/unmap operations */
 	struct mutex *lock = &db_attach->dmabuf->lock;
 	struct sg_table *sgt;
-	int ret;
 
 	mutex_lock(lock);
 
@@ -306,8 +305,9 @@ static struct sg_table *vb2_vmalloc_dmabuf_ops_map(
 	}
 
 	/* mapping to the client with new direction */
-	ret = dma_map_sg(db_attach->dev, sgt->sgl, sgt->orig_nents, dma_dir);
-	if (ret <= 0) {
+	sgt->nents = dma_map_sg(db_attach->dev, sgt->sgl, sgt->orig_nents,
+				dma_dir);
+	if (!sgt->nents) {
 		pr_err("failed to map scatterlist\n");
 		mutex_unlock(lock);
 		return ERR_PTR(-EIO);