[media] v4l: Add v4l2 subdev driver for S5P/EXYNOS4 MIPI-CSI receivers

Add the subdev driver for the MIPI CSIS units available in S5P and
Exynos4 SoC series. This driver supports both CSIS0 and CSIS1
MIPI-CSI2 receivers.
The driver requires Runtime PM to be enabled for proper operation.
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/Kconfig

@@ -946,6 +946,15 @@ config  VIDEO_SAMSUNG_S5P_FIMC
 	  To compile this driver as a module, choose M here: the
 	  module will be called s5p-fimc.
 
+config VIDEO_S5P_MIPI_CSIS
+	tristate "Samsung S5P and EXYNOS4 MIPI CSI receiver driver"
+	depends on VIDEO_V4L2 && PM_RUNTIME && VIDEO_V4L2_SUBDEV_API
+	---help---
+	  This is a v4l2 driver for Samsung S5P/EXYNOS4 MIPI-CSI receiver.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called s5p-csis.
+
 #
 # USB Multimedia device configuration
 #

drivers/media/video/s5p-fimc/Makefile

+s5p-fimc-objs := fimc-core.o fimc-reg.o fimc-capture.o
+s5p-csis-objs := mipi-csis.o
 
-obj-$(CONFIG_VIDEO_SAMSUNG_S5P_FIMC) := s5p-fimc.o
-s5p-fimc-y := fimc-core.o fimc-reg.o fimc-capture.o
+obj-$(CONFIG_VIDEO_S5P_MIPI_CSIS)	+= s5p-csis.o
+obj-$(CONFIG_VIDEO_SAMSUNG_S5P_FIMC)	+= s5p-fimc.o

drivers/media/video/s5p-fimc/mipi-csis.c

+/*
+ * Samsung S5P/EXYNOS4 SoC series MIPI-CSI receiver driver
+ *
+ * Copyright (C) 2011 Samsung Electronics Co., Ltd.
+ * Contact: Sylwester Nawrocki, <s.nawrocki@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/clk.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/kernel.h>
+#include <linux/memory.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/videodev2.h>
+#include <media/v4l2-subdev.h>
+#include <plat/mipi_csis.h>
+#include "mipi-csis.h"
+
+static int debug;
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug, "Debug level (0-1)");
+
+/* Register map definition */
+
+/* CSIS global control */
+#define S5PCSIS_CTRL			0x00
+#define S5PCSIS_CTRL_DPDN_DEFAULT	(0 << 31)
+#define S5PCSIS_CTRL_DPDN_SWAP		(1 << 31)
+#define S5PCSIS_CTRL_ALIGN_32BIT	(1 << 20)
+#define S5PCSIS_CTRL_UPDATE_SHADOW	(1 << 16)
+#define S5PCSIS_CTRL_WCLK_EXTCLK	(1 << 8)
+#define S5PCSIS_CTRL_RESET		(1 << 4)
+#define S5PCSIS_CTRL_ENABLE		(1 << 0)
+
+/* D-PHY control */
+#define S5PCSIS_DPHYCTRL		0x04
+#define S5PCSIS_DPHYCTRL_HSS_MASK	(0x1f << 27)
+#define S5PCSIS_DPHYCTRL_ENABLE		(0x1f << 0)
+
+#define S5PCSIS_CONFIG			0x08
+#define S5PCSIS_CFG_FMT_YCBCR422_8BIT	(0x1e << 2)
+#define S5PCSIS_CFG_FMT_RAW8		(0x2a << 2)
+#define S5PCSIS_CFG_FMT_RAW10		(0x2b << 2)
+#define S5PCSIS_CFG_FMT_RAW12		(0x2c << 2)
+/* User defined formats, x = 1...4 */
+#define S5PCSIS_CFG_FMT_USER(x)		((0x30 + x - 1) << 2)
+#define S5PCSIS_CFG_FMT_MASK		(0x3f << 2)
+#define S5PCSIS_CFG_NR_LANE_MASK	3
+
+/* Interrupt mask. */
+#define S5PCSIS_INTMSK			0x10
+#define S5PCSIS_INTMSK_EN_ALL		0xf000003f
+#define S5PCSIS_INTSRC			0x14
+
+/* Pixel resolution */
+#define S5PCSIS_RESOL			0x2c
+#define CSIS_MAX_PIX_WIDTH		0xffff
+#define CSIS_MAX_PIX_HEIGHT		0xffff
+
+enum {
+	CSIS_CLK_MUX,
+	CSIS_CLK_GATE,
+};
+
+static char *csi_clock_name[] = {
+	[CSIS_CLK_MUX]  = "sclk_csis",
+	[CSIS_CLK_GATE] = "csis",
+};
+#define NUM_CSIS_CLOCKS	ARRAY_SIZE(csi_clock_name)
+
+enum {
+	ST_POWERED	= 1,
+	ST_STREAMING	= 2,
+	ST_SUSPENDED	= 4,
+};
+
+/**
+ * struct csis_state - the driver's internal state data structure
+ * @lock: mutex serializing the subdev and power management operations,
+ *        protecting @format and @flags members
+ * @pads: CSIS pads array
+ * @sd: v4l2_subdev associated with CSIS device instance
+ * @pdev: CSIS platform device
+ * @regs_res: requested I/O register memory resource
+ * @regs: mmaped I/O registers memory
+ * @clock: CSIS clocks
+ * @irq: requested s5p-mipi-csis irq number
+ * @flags: the state variable for power and streaming control
+ * @csis_fmt: current CSIS pixel format
+ * @format: common media bus format for the source and sink pad
+ */
+struct csis_state {
+	struct mutex lock;
+	struct media_pad pads[CSIS_PADS_NUM];
+	struct v4l2_subdev sd;
+	struct platform_device *pdev;
+	struct resource *regs_res;
+	void __iomem *regs;
+	struct clk *clock[NUM_CSIS_CLOCKS];
+	int irq;
+	struct regulator *supply;
+	u32 flags;
+	const struct csis_pix_format *csis_fmt;
+	struct v4l2_mbus_framefmt format;
+};
+
+/**
+ * struct csis_pix_format - CSIS pixel format description
+ * @pix_width_alignment: horizontal pixel alignment, width will be
+ *                       multiple of 2^pix_width_alignment
+ * @code: corresponding media bus code
+ * @fmt_reg: S5PCSIS_CONFIG register value
+ */
+struct csis_pix_format {
+	unsigned int pix_width_alignment;
+	enum v4l2_mbus_pixelcode code;
+	u32 fmt_reg;
+};
+
+static const struct csis_pix_format s5pcsis_formats[] = {
+	{
+		.code = V4L2_MBUS_FMT_VYUY8_2X8,
+		.fmt_reg = S5PCSIS_CFG_FMT_YCBCR422_8BIT,
+	}, {
+		.code = V4L2_MBUS_FMT_JPEG_1X8,
+		.fmt_reg = S5PCSIS_CFG_FMT_USER(1),
+	},
+};
+
+#define s5pcsis_write(__csis, __r, __v) writel(__v, __csis->regs + __r)
+#define s5pcsis_read(__csis, __r) readl(__csis->regs + __r)
+
+static struct csis_state *sd_to_csis_state(struct v4l2_subdev *sdev)
+{
+	return container_of(sdev, struct csis_state, sd);
+}
+
+static const struct csis_pix_format *find_csis_format(
+	struct v4l2_mbus_framefmt *mf)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(s5pcsis_formats); i++)
+		if (mf->code == s5pcsis_formats[i].code)
+			return &s5pcsis_formats[i];
+	return NULL;
+}
+
+static void s5pcsis_enable_interrupts(struct csis_state *state, bool on)
+{
+	u32 val = s5pcsis_read(state, S5PCSIS_INTMSK);
+
+	val = on ? val | S5PCSIS_INTMSK_EN_ALL :
+		   val & ~S5PCSIS_INTMSK_EN_ALL;
+	s5pcsis_write(state, S5PCSIS_INTMSK, val);
+}
+
+static void s5pcsis_reset(struct csis_state *state)
+{
+	u32 val = s5pcsis_read(state, S5PCSIS_CTRL);
+
+	s5pcsis_write(state, S5PCSIS_CTRL, val | S5PCSIS_CTRL_RESET);
+	udelay(10);
+}
+
+static void s5pcsis_system_enable(struct csis_state *state, int on)
+{
+	u32 val;
+
+	val = s5pcsis_read(state, S5PCSIS_CTRL);
+	if (on)
+		val |= S5PCSIS_CTRL_ENABLE;
+	else
+		val &= ~S5PCSIS_CTRL_ENABLE;
+	s5pcsis_write(state, S5PCSIS_CTRL, val);
+
+	val = s5pcsis_read(state, S5PCSIS_DPHYCTRL);
+	if (on)
+		val |= S5PCSIS_DPHYCTRL_ENABLE;
+	else
+		val &= ~S5PCSIS_DPHYCTRL_ENABLE;
+	s5pcsis_write(state, S5PCSIS_DPHYCTRL, val);
+}
+
+/* Called with the state.lock mutex held */
+static void __s5pcsis_set_format(struct csis_state *state)
+{
+	struct v4l2_mbus_framefmt *mf = &state->format;
+	u32 val;
+
+	v4l2_dbg(1, debug, &state->sd, "fmt: %d, %d x %d\n",
+		 mf->code, mf->width, mf->height);
+
+	/* Color format */
+	val = s5pcsis_read(state, S5PCSIS_CONFIG);
+	val = (val & ~S5PCSIS_CFG_FMT_MASK) | state->csis_fmt->fmt_reg;
+	s5pcsis_write(state, S5PCSIS_CONFIG, val);
+
+	/* Pixel resolution */
+	val = (mf->width << 16) | mf->height;
+	s5pcsis_write(state, S5PCSIS_RESOL, val);
+}
+
+static void s5pcsis_set_hsync_settle(struct csis_state *state, int settle)
+{
+	u32 val = s5pcsis_read(state, S5PCSIS_DPHYCTRL);
+
+	val = (val & ~S5PCSIS_DPHYCTRL_HSS_MASK) | (settle << 27);
+	s5pcsis_write(state, S5PCSIS_DPHYCTRL, val);
+}
+
+static void s5pcsis_set_params(struct csis_state *state)
+{
+	struct s5p_platform_mipi_csis *pdata = state->pdev->dev.platform_data;
+	u32 val;
+
+	val = s5pcsis_read(state, S5PCSIS_CONFIG);
+	val = (val & ~S5PCSIS_CFG_NR_LANE_MASK) | (pdata->lanes - 1);
+	s5pcsis_write(state, S5PCSIS_CONFIG, val);
+
+	__s5pcsis_set_format(state);
+	s5pcsis_set_hsync_settle(state, pdata->hs_settle);
+
+	val = s5pcsis_read(state, S5PCSIS_CTRL);
+	if (pdata->alignment == 32)
+		val |= S5PCSIS_CTRL_ALIGN_32BIT;
+	else /* 24-bits */
+		val &= ~S5PCSIS_CTRL_ALIGN_32BIT;
+	/* Not using external clock. */
+	val &= ~S5PCSIS_CTRL_WCLK_EXTCLK;
+	s5pcsis_write(state, S5PCSIS_CTRL, val);
+
+	/* Update the shadow register. */
+	val = s5pcsis_read(state, S5PCSIS_CTRL);
+	s5pcsis_write(state, S5PCSIS_CTRL, val | S5PCSIS_CTRL_UPDATE_SHADOW);
+}
+
+static void s5pcsis_clk_put(struct csis_state *state)
+{
+	int i;
+
+	for (i = 0; i < NUM_CSIS_CLOCKS; i++)
+		if (!IS_ERR_OR_NULL(state->clock[i]))
+			clk_put(state->clock[i]);
+}
+
+static int s5pcsis_clk_get(struct csis_state *state)
+{
+	struct device *dev = &state->pdev->dev;
+	int i;
+
+	for (i = 0; i < NUM_CSIS_CLOCKS; i++) {
+		state->clock[i] = clk_get(dev, csi_clock_name[i]);
+		if (IS_ERR(state->clock[i])) {
+			s5pcsis_clk_put(state);
+			dev_err(dev, "failed to get clock: %s\n",
+				csi_clock_name[i]);
+			return -ENXIO;
+		}
+	}
+	return 0;
+}
+
+static int s5pcsis_s_power(struct v4l2_subdev *sd, int on)
+{
+	struct csis_state *state = sd_to_csis_state(sd);
+	struct device *dev = &state->pdev->dev;
+
+	if (on)
+		return pm_runtime_get_sync(dev);
+
+	return pm_runtime_put_sync(dev);
+}
+
+static void s5pcsis_start_stream(struct csis_state *state)
+{
+	s5pcsis_reset(state);
+	s5pcsis_set_params(state);
+	s5pcsis_system_enable(state, true);
+	s5pcsis_enable_interrupts(state, true);
+}
+
+static void s5pcsis_stop_stream(struct csis_state *state)
+{
+	s5pcsis_enable_interrupts(state, false);
+	s5pcsis_system_enable(state, false);
+}
+
+/* v4l2_subdev operations */
+static int s5pcsis_s_stream(struct v4l2_subdev *sd, int enable)
+{
+	struct csis_state *state = sd_to_csis_state(sd);
+	int ret = 0;
+
+	v4l2_dbg(1, debug, sd, "%s: %d, state: 0x%x\n",
+		 __func__, enable, state->flags);
+
+	if (enable) {
+		ret = pm_runtime_get_sync(&state->pdev->dev);
+		if (ret && ret != 1)
+			return ret;
+	}
+	mutex_lock(&state->lock);
+	if (enable) {
+		if (state->flags & ST_SUSPENDED) {
+			ret = -EBUSY;
+			goto unlock;
+		}
+		s5pcsis_start_stream(state);
+		state->flags |= ST_STREAMING;
+	} else {
+		s5pcsis_stop_stream(state);
+		state->flags &= ~ST_STREAMING;
+	}
+unlock:
+	mutex_unlock(&state->lock);
+	if (!enable)
+		pm_runtime_put(&state->pdev->dev);
+
+	return ret == 1 ? 0 : ret;
+}
+
+static int s5pcsis_enum_mbus_code(struct v4l2_subdev *sd,
+				  struct v4l2_subdev_fh *fh,
+				  struct v4l2_subdev_mbus_code_enum *code)
+{
+	if (code->index >= ARRAY_SIZE(s5pcsis_formats))
+		return -EINVAL;
+
+	code->code = s5pcsis_formats[code->index].code;
+	return 0;
+}
+
+static struct csis_pix_format const *s5pcsis_try_format(
+	struct v4l2_mbus_framefmt *mf)
+{
+	struct csis_pix_format const *csis_fmt;
+
+	csis_fmt = find_csis_format(mf);
+	if (csis_fmt == NULL)
+		csis_fmt = &s5pcsis_formats[0];
+
+	mf->code = csis_fmt->code;
+	v4l_bound_align_image(&mf->width, 1, CSIS_MAX_PIX_WIDTH,
+			      csis_fmt->pix_width_alignment,
+			      &mf->height, 1, CSIS_MAX_PIX_HEIGHT, 1,
+			      0);
+	return csis_fmt;
+}
+
+static struct v4l2_mbus_framefmt *__s5pcsis_get_format(
+		struct csis_state *state, struct v4l2_subdev_fh *fh,
+		u32 pad, enum v4l2_subdev_format_whence which)
+{
+	if (which == V4L2_SUBDEV_FORMAT_TRY)
+		return fh ? v4l2_subdev_get_try_format(fh, pad) : NULL;
+
+	return &state->format;
+}
+
+static int s5pcsis_set_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
+			   struct v4l2_subdev_format *fmt)
+{
+	struct csis_state *state = sd_to_csis_state(sd);
+	struct csis_pix_format const *csis_fmt;
+	struct v4l2_mbus_framefmt *mf;
+
+	if (fmt->pad != CSIS_PAD_SOURCE && fmt->pad != CSIS_PAD_SINK)
+		return -EINVAL;
+
+	mf = __s5pcsis_get_format(state, fh, fmt->pad, fmt->which);
+
+	if (fmt->pad == CSIS_PAD_SOURCE) {
+		if (mf) {
+			mutex_lock(&state->lock);
+			fmt->format = *mf;
+			mutex_unlock(&state->lock);
+		}
+		return 0;
+	}
+	csis_fmt = s5pcsis_try_format(&fmt->format);
+	if (mf) {
+		mutex_lock(&state->lock);
+		*mf = fmt->format;
+		if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE)
+			state->csis_fmt = csis_fmt;
+		mutex_unlock(&state->lock);
+	}
+	return 0;
+}
+
+static int s5pcsis_get_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh,
+			   struct v4l2_subdev_format *fmt)
+{
+	struct csis_state *state = sd_to_csis_state(sd);
+	struct v4l2_mbus_framefmt *mf;
+
+	if (fmt->pad != CSIS_PAD_SOURCE && fmt->pad != CSIS_PAD_SINK)
+		return -EINVAL;
+
+	mf = __s5pcsis_get_format(state, fh, fmt->pad, fmt->which);
+	if (!mf)
+		return -EINVAL;
+
+	mutex_lock(&state->lock);
+	fmt->format = *mf;
+	mutex_unlock(&state->lock);
+	return 0;
+}
+
+static struct v4l2_subdev_core_ops s5pcsis_core_ops = {
+	.s_power = s5pcsis_s_power,
+};
+
+static struct v4l2_subdev_pad_ops s5pcsis_pad_ops = {
+	.enum_mbus_code = s5pcsis_enum_mbus_code,
+	.get_fmt = s5pcsis_get_fmt,
+	.set_fmt = s5pcsis_set_fmt,
+};
+
+static struct v4l2_subdev_video_ops s5pcsis_video_ops = {
+	.s_stream = s5pcsis_s_stream,
+};
+
+static struct v4l2_subdev_ops s5pcsis_subdev_ops = {
+	.core = &s5pcsis_core_ops,
+	.pad = &s5pcsis_pad_ops,
+	.video = &s5pcsis_video_ops,
+};
+
+static irqreturn_t s5pcsis_irq_handler(int irq, void *dev_id)
+{
+	struct csis_state *state = dev_id;
+	u32 val;
+
+	/* Just clear the interrupt pending bits. */
+	val = s5pcsis_read(state, S5PCSIS_INTSRC);
+	s5pcsis_write(state, S5PCSIS_INTSRC, val);
+
+	return IRQ_HANDLED;
+}
+
+static int __devinit s5pcsis_probe(struct platform_device *pdev)
+{
+	struct s5p_platform_mipi_csis *pdata;
+	struct resource *mem_res;
+	struct resource *regs_res;
+	struct csis_state *state;
+	int ret = -ENOMEM;
+
+	state = kzalloc(sizeof(*state), GFP_KERNEL);
+	if (!state)
+		return -ENOMEM;
+
+	mutex_init(&state->lock);
+	state->pdev = pdev;
+
+	pdata = pdev->dev.platform_data;
+	if (pdata == NULL || pdata->phy_enable == NULL) {
+		dev_err(&pdev->dev, "Platform data not fully specified\n");
+		goto e_free;
+	}
+
+	if ((pdev->id == 1 && pdata->lanes > CSIS1_MAX_LANES) ||
+	    pdata->lanes > CSIS0_MAX_LANES) {
+		ret = -EINVAL;
+		dev_err(&pdev->dev, "Unsupported number of data lanes: %d\n",
+			pdata->lanes);
+		goto e_free;
+	}
+
+	mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!mem_res) {
+		dev_err(&pdev->dev, "Failed to get IO memory region\n");
+		goto e_free;
+	}
+
+	regs_res = request_mem_region(mem_res->start, resource_size(mem_res),
+				      pdev->name);
+	if (!regs_res) {
+		dev_err(&pdev->dev, "Failed to request IO memory region\n");
+		goto e_free;
+	}
+	state->regs_res = regs_res;
+
+	state->regs = ioremap(mem_res->start, resource_size(mem_res));
+	if (!state->regs) {
+		dev_err(&pdev->dev, "Failed to remap IO region\n");
+		goto e_reqmem;
+	}
+
+	ret = s5pcsis_clk_get(state);
+	if (ret)
+		goto e_unmap;
+
+	clk_enable(state->clock[CSIS_CLK_MUX]);
+	if (pdata->clk_rate)
+		clk_set_rate(state->clock[CSIS_CLK_MUX], pdata->clk_rate);
+	else
+		dev_WARN(&pdev->dev, "No clock frequency specified!\n");
+
+	state->irq = platform_get_irq(pdev, 0);
+	if (state->irq < 0) {
+		ret = state->irq;
+		dev_err(&pdev->dev, "Failed to get irq\n");
+		goto e_clkput;
+	}
+
+	if (!pdata->fixed_phy_vdd) {
+		state->supply = regulator_get(&pdev->dev, "vdd");
+		if (IS_ERR(state->supply)) {
+			ret = PTR_ERR(state->supply);
+			state->supply = NULL;
+			goto e_clkput;
+		}
+	}
+
+	ret = request_irq(state->irq, s5pcsis_irq_handler, 0,
+			  dev_name(&pdev->dev), state);
+	if (ret) {
+		dev_err(&pdev->dev, "request_irq failed\n");
+		goto e_regput;
+	}
+
+	v4l2_subdev_init(&state->sd, &s5pcsis_subdev_ops);
+	state->sd.owner = THIS_MODULE;
+	strlcpy(state->sd.name, dev_name(&pdev->dev), sizeof(state->sd.name));
+	state->csis_fmt = &s5pcsis_formats[0];
+
+	state->pads[CSIS_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
+	state->pads[CSIS_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
+	ret = media_entity_init(&state->sd.entity,
+				CSIS_PADS_NUM, state->pads, 0);
+	if (ret < 0)
+		goto e_irqfree;
+
+	/* This allows to retrieve the platform device id by the host driver */
+	v4l2_set_subdevdata(&state->sd, pdev);
+
+	/* .. and a pointer to the subdev. */
+	platform_set_drvdata(pdev, &state->sd);
+
+	state->flags = ST_SUSPENDED;
+	pm_runtime_enable(&pdev->dev);
+
+	return 0;
+
+e_irqfree:
+	free_irq(state->irq, state);
+e_regput:
+	if (state->supply)
+		regulator_put(state->supply);
+e_clkput:
+	clk_disable(state->clock[CSIS_CLK_MUX]);
+	s5pcsis_clk_put(state);
+e_unmap:
+	iounmap(state->regs);
+e_reqmem:
+	release_mem_region(regs_res->start, resource_size(regs_res));
+e_free:
+	kfree(state);
+	return ret;
+}
+
+static int s5pcsis_suspend(struct device *dev)
+{
+	struct s5p_platform_mipi_csis *pdata = dev->platform_data;
+	struct platform_device *pdev = to_platform_device(dev);
+	struct v4l2_subdev *sd = platform_get_drvdata(pdev);
+	struct csis_state *state = sd_to_csis_state(sd);
+	int ret;
+
+	v4l2_dbg(1, debug, sd, "%s: flags: 0x%x\n",
+		 __func__, state->flags);
+
+	mutex_lock(&state->lock);
+	if (state->flags & ST_POWERED) {
+		s5pcsis_stop_stream(state);
+		ret = pdata->phy_enable(state->pdev, false);
+		if (ret)
+			goto unlock;
+		if (state->supply) {
+			ret = regulator_disable(state->supply);
+			if (ret)
+				goto unlock;
+		}
+		clk_disable(state->clock[CSIS_CLK_GATE]);
+		state->flags &= ~ST_POWERED;
+	}
+	state->flags |= ST_SUSPENDED;
+ unlock:
+	mutex_unlock(&state->lock);
+	return ret ? -EAGAIN : 0;
+}
+
+static int s5pcsis_resume(struct device *dev)
+{
+	struct s5p_platform_mipi_csis *pdata = dev->platform_data;
+	struct platform_device *pdev = to_platform_device(dev);
+	struct v4l2_subdev *sd = platform_get_drvdata(pdev);
+	struct csis_state *state = sd_to_csis_state(sd);
+	int ret = 0;
+
+	v4l2_dbg(1, debug, sd, "%s: flags: 0x%x\n",
+		 __func__, state->flags);
+
+	mutex_lock(&state->lock);
+	if (!(state->flags & ST_SUSPENDED))
+		goto unlock;
+
+	if (!(state->flags & ST_POWERED)) {
+		if (state->supply)
+			ret = regulator_enable(state->supply);
+		if (ret)
+			goto unlock;
+
+		ret = pdata->phy_enable(state->pdev, true);
+		if (!ret) {
+			state->flags |= ST_POWERED;
+		} else {
+			regulator_disable(state->supply);
+			goto unlock;
+		}
+		clk_enable(state->clock[CSIS_CLK_GATE]);
+	}
+	if (state->flags & ST_STREAMING)
+		s5pcsis_start_stream(state);
+
+	state->flags &= ~ST_SUSPENDED;
+ unlock:
+	mutex_unlock(&state->lock);
+	return ret ? -EAGAIN : 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int s5pcsis_pm_suspend(struct device *dev)
+{
+	return s5pcsis_suspend(dev);
+}
+
+static int s5pcsis_pm_resume(struct device *dev)
+{
+	int ret;
+
+	ret = s5pcsis_resume(dev);
+
+	if (!ret) {
+		pm_runtime_disable(dev);
+		ret = pm_runtime_set_active(dev);
+		pm_runtime_enable(dev);
+	}
+
+	return ret;
+}
+#endif
+
+static int __devexit s5pcsis_remove(struct platform_device *pdev)
+{
+	struct v4l2_subdev *sd = platform_get_drvdata(pdev);
+	struct csis_state *state = sd_to_csis_state(sd);
+	struct resource *res = state->regs_res;
+
+	pm_runtime_disable(&pdev->dev);
+	s5pcsis_suspend(&pdev->dev);
+	clk_disable(state->clock[CSIS_CLK_MUX]);
+	pm_runtime_set_suspended(&pdev->dev);
+
+	s5pcsis_clk_put(state);
+	if (state->supply)
+		regulator_put(state->supply);
+
+	media_entity_cleanup(&state->sd.entity);
+	free_irq(state->irq, state);
+	iounmap(state->regs);
+	release_mem_region(res->start, resource_size(res));
+	kfree(state);
+
+	return 0;
+}
+
+static const struct dev_pm_ops s5pcsis_pm_ops = {
+	SET_RUNTIME_PM_OPS(s5pcsis_suspend, s5pcsis_resume, NULL)
+	SET_SYSTEM_SLEEP_PM_OPS(s5pcsis_pm_suspend, s5pcsis_pm_resume)
+};
+
+static struct platform_driver s5pcsis_driver = {
+	.probe		= s5pcsis_probe,
+	.remove		= __devexit_p(s5pcsis_remove),
+	.driver		= {
+		.name	= CSIS_DRIVER_NAME,
+		.owner	= THIS_MODULE,
+		.pm	= &s5pcsis_pm_ops,
+	},
+};
+
+static int __init s5pcsis_init(void)
+{
+	return platform_driver_probe(&s5pcsis_driver, s5pcsis_probe);
+}
+
+static void __exit s5pcsis_exit(void)
+{
+	platform_driver_unregister(&s5pcsis_driver);
+}
+
+module_init(s5pcsis_init);
+module_exit(s5pcsis_exit);
+
+MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
+MODULE_DESCRIPTION("S5P/EXYNOS4 MIPI CSI receiver driver");
+MODULE_LICENSE("GPL");

drivers/media/video/s5p-fimc/mipi-csis.h

+/*
+ * Samsung S5P/EXYNOS4 SoC series MIPI-CSI receiver driver
+ *
+ * Copyright (C) 2011 Samsung Electronics Co., Ltd.
+ *
+ * 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 S5P_MIPI_CSIS_H_
+#define S5P_MIPI_CSIS_H_
+
+#define CSIS_DRIVER_NAME	"s5p-mipi-csis"
+#define CSIS_MAX_ENTITIES	2
+#define CSIS0_MAX_LANES		4
+#define CSIS1_MAX_LANES		2
+
+#define CSIS_PAD_SINK		0
+#define CSIS_PAD_SOURCE		1
+#define CSIS_PADS_NUM		2
+
+#endif