drivers/media/platform/s5p-tv/sdo_drv.c - arm/linux-arm64-legacy - Git at Google

 /*
  * Samsung Standard Definition Output (SDO) driver
  *
  * Copyright (c) 2010-2011 Samsung Electronics Co., Ltd.
  *
  * Tomasz Stanislawski, <t.stanislaws@samsung.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published
  * by the Free Software Foundiation. either version 2 of the License,
  * or (at your option) any later version
  */

 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/irq.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/regulator/consumer.h>
 #include <linux/slab.h>

 #include <media/v4l2-subdev.h>

 #include "regs-sdo.h"

 MODULE_AUTHOR("Tomasz Stanislawski, <t.stanislaws@samsung.com>");
 MODULE_DESCRIPTION("Samsung Standard Definition Output (SDO)");
 MODULE_LICENSE("GPL");

 #define SDO_DEFAULT_STD	V4L2_STD_PAL

 struct sdo_format {
 	v4l2_std_id id;
 	/* all modes are 720 pixels wide */
 	unsigned int height;
 	unsigned int cookie;
 };

 struct sdo_device {
 	/** pointer to device parent */
 	struct device *dev;
 	/** base address of SDO registers */
 	void __iomem *regs;
 	/** SDO interrupt */
 	unsigned int irq;
 	/** DAC source clock */
 	struct clk *sclk_dac;
 	/** DAC clock */
 	struct clk *dac;
 	/** DAC physical interface */
 	struct clk *dacphy;
 	/** clock for control of VPLL */
 	struct clk *fout_vpll;
 	/** vpll rate before sdo stream was on */
 	unsigned long vpll_rate;
 	/** regulator for SDO IP power */
 	struct regulator *vdac;
 	/** regulator for SDO plug detection */
 	struct regulator *vdet;
 	/** subdev used as device interface */
 	struct v4l2_subdev sd;
 	/** current format */
 	const struct sdo_format *fmt;
 };

 static inline struct sdo_device *sd_to_sdev(struct v4l2_subdev *sd)
 {
 	return container_of(sd, struct sdo_device, sd);
 }

 static inline
 void sdo_write_mask(struct sdo_device *sdev, u32 reg_id, u32 value, u32 mask)
 {
 	u32 old = readl(sdev->regs + reg_id);
 	value = (value & mask) | (old & ~mask);
 	writel(value, sdev->regs + reg_id);
 }

 static inline
 void sdo_write(struct sdo_device *sdev, u32 reg_id, u32 value)
 {
 	writel(value, sdev->regs + reg_id);
 }

 static inline
 u32 sdo_read(struct sdo_device *sdev, u32 reg_id)
 {
 	return readl(sdev->regs + reg_id);
 }

 static irqreturn_t sdo_irq_handler(int irq, void *dev_data)
 {
 	struct sdo_device *sdev = dev_data;

 	/* clear interrupt */
 	sdo_write_mask(sdev, SDO_IRQ, ~0, SDO_VSYNC_IRQ_PEND);
 	return IRQ_HANDLED;
 }

 static void sdo_reg_debug(struct sdo_device *sdev)
 {
 #define DBGREG(reg_id) \
 	dev_info(sdev->dev, #reg_id " = %08x\n", \
 		sdo_read(sdev, reg_id))

 	DBGREG(SDO_CLKCON);
 	DBGREG(SDO_CONFIG);
 	DBGREG(SDO_VBI);
 	DBGREG(SDO_DAC);
 	DBGREG(SDO_IRQ);
 	DBGREG(SDO_IRQMASK);
 	DBGREG(SDO_VERSION);
 }

 static const struct sdo_format sdo_format[] = {
 	{ V4L2_STD_PAL_N,	.height = 576, .cookie = SDO_PAL_N },
 	{ V4L2_STD_PAL_Nc,	.height = 576, .cookie = SDO_PAL_NC },
 	{ V4L2_STD_PAL_M,	.height = 480, .cookie = SDO_PAL_M },
 	{ V4L2_STD_PAL_60,	.height = 480, .cookie = SDO_PAL_60 },
 	{ V4L2_STD_NTSC_443,	.height = 480, .cookie = SDO_NTSC_443 },
 	{ V4L2_STD_PAL,		.height = 576, .cookie = SDO_PAL_BGHID },
 	{ V4L2_STD_NTSC_M,	.height = 480, .cookie = SDO_NTSC_M },
 };

 static const struct sdo_format *sdo_find_format(v4l2_std_id id)
 {
 	int i;
 	for (i = 0; i < ARRAY_SIZE(sdo_format); ++i)
 		if (sdo_format[i].id & id)
 			return &sdo_format[i];
 	return NULL;
 }

 static int sdo_g_tvnorms_output(struct v4l2_subdev *sd, v4l2_std_id *std)
 {
 	*std = V4L2_STD_NTSC_M | V4L2_STD_PAL_M | V4L2_STD_PAL |
 		V4L2_STD_PAL_N | V4L2_STD_PAL_Nc |
 		V4L2_STD_NTSC_443 | V4L2_STD_PAL_60;
 	return 0;
 }

 static int sdo_s_std_output(struct v4l2_subdev *sd, v4l2_std_id std)
 {
 	struct sdo_device *sdev = sd_to_sdev(sd);
 	const struct sdo_format *fmt;
 	fmt = sdo_find_format(std);
 	if (fmt == NULL)
 		return -EINVAL;
 	sdev->fmt = fmt;
 	return 0;
 }

 static int sdo_g_std_output(struct v4l2_subdev *sd, v4l2_std_id *std)
 {
 	*std = sd_to_sdev(sd)->fmt->id;
 	return 0;
 }

 static int sdo_g_mbus_fmt(struct v4l2_subdev *sd,
 	struct v4l2_mbus_framefmt *fmt)
 {
 	struct sdo_device *sdev = sd_to_sdev(sd);

 	if (!sdev->fmt)
 		return -ENXIO;
 	/* all modes are 720 pixels wide */
 	fmt->width = 720;
 	fmt->height = sdev->fmt->height;
 	fmt->code = V4L2_MBUS_FMT_FIXED;
 	fmt->field = V4L2_FIELD_INTERLACED;
 	fmt->colorspace = V4L2_COLORSPACE_JPEG;
 	return 0;
 }

 static int sdo_s_power(struct v4l2_subdev *sd, int on)
 {
 	struct sdo_device *sdev = sd_to_sdev(sd);
 	struct device *dev = sdev->dev;
 	int ret;

 	dev_info(dev, "sdo_s_power(%d)\n", on);

 	if (on)
 		ret = pm_runtime_get_sync(dev);
 	else
 		ret = pm_runtime_put_sync(dev);

 	/* only values < 0 indicate errors */
 	return IS_ERR_VALUE(ret) ? ret : 0;
 }

 static int sdo_streamon(struct sdo_device *sdev)
 {
 	int ret;

 	/* set proper clock for Timing Generator */
 	sdev->vpll_rate = clk_get_rate(sdev->fout_vpll);
 	ret = clk_set_rate(sdev->fout_vpll, 54000000);
 	if (ret < 0) {
 		dev_err(sdev->dev, "Failed to set vpll rate\n");
 		return ret;
 	}
 	dev_info(sdev->dev, "fout_vpll.rate = %lu\n",
 	clk_get_rate(sdev->fout_vpll));
 	/* enable clock in SDO */
 	sdo_write_mask(sdev, SDO_CLKCON, ~0, SDO_TVOUT_CLOCK_ON);
 	ret = clk_prepare_enable(sdev->dacphy);
 	if (ret < 0) {
 		dev_err(sdev->dev, "clk_prepare_enable(dacphy) failed\n");
 		goto fail;
 	}
 	/* enable DAC */
 	sdo_write_mask(sdev, SDO_DAC, ~0, SDO_POWER_ON_DAC);
 	sdo_reg_debug(sdev);
 	return 0;

 fail:
 	sdo_write_mask(sdev, SDO_CLKCON, 0, SDO_TVOUT_CLOCK_ON);
 	clk_set_rate(sdev->fout_vpll, sdev->vpll_rate);
 	return ret;
 }

 static int sdo_streamoff(struct sdo_device *sdev)
 {
 	int tries;

 	sdo_write_mask(sdev, SDO_DAC, 0, SDO_POWER_ON_DAC);
 	clk_disable_unprepare(sdev->dacphy);
 	sdo_write_mask(sdev, SDO_CLKCON, 0, SDO_TVOUT_CLOCK_ON);
 	for (tries = 100; tries; --tries) {
 		if (sdo_read(sdev, SDO_CLKCON) & SDO_TVOUT_CLOCK_READY)
 			break;
 		mdelay(1);
 	}
 	if (tries == 0)
 		dev_err(sdev->dev, "failed to stop streaming\n");
 	clk_set_rate(sdev->fout_vpll, sdev->vpll_rate);
 	return tries ? 0 : -EIO;
 }

 static int sdo_s_stream(struct v4l2_subdev *sd, int on)
 {
 	struct sdo_device *sdev = sd_to_sdev(sd);
 	return on ? sdo_streamon(sdev) : sdo_streamoff(sdev);
 }

 static const struct v4l2_subdev_core_ops sdo_sd_core_ops = {
 	.s_power = sdo_s_power,
 };

 static const struct v4l2_subdev_video_ops sdo_sd_video_ops = {
 	.s_std_output = sdo_s_std_output,
 	.g_std_output = sdo_g_std_output,
 	.g_tvnorms_output = sdo_g_tvnorms_output,
 	.g_mbus_fmt = sdo_g_mbus_fmt,
 	.s_stream = sdo_s_stream,
 };

 static const struct v4l2_subdev_ops sdo_sd_ops = {
 	.core = &sdo_sd_core_ops,
 	.video = &sdo_sd_video_ops,
 };

 static int sdo_runtime_suspend(struct device *dev)
 {
 	struct v4l2_subdev *sd = dev_get_drvdata(dev);
 	struct sdo_device *sdev = sd_to_sdev(sd);

 	dev_info(dev, "suspend\n");
 	regulator_disable(sdev->vdet);
 	regulator_disable(sdev->vdac);
 	clk_disable_unprepare(sdev->sclk_dac);
 	return 0;
 }

 static int sdo_runtime_resume(struct device *dev)
 {
 	struct v4l2_subdev *sd = dev_get_drvdata(dev);
 	struct sdo_device *sdev = sd_to_sdev(sd);
 	int ret;

 	dev_info(dev, "resume\n");

 	ret = clk_prepare_enable(sdev->sclk_dac);
 	if (ret < 0)
 		return ret;

 	ret = regulator_enable(sdev->vdac);
 	if (ret < 0)
 		goto dac_clk_dis;

 	ret = regulator_enable(sdev->vdet);
 	if (ret < 0)
 		goto vdac_r_dis;

 	/* software reset */
 	sdo_write_mask(sdev, SDO_CLKCON, ~0, SDO_TVOUT_SW_RESET);
 	mdelay(10);
 	sdo_write_mask(sdev, SDO_CLKCON, 0, SDO_TVOUT_SW_RESET);

 	/* setting TV mode */
 	sdo_write_mask(sdev, SDO_CONFIG, sdev->fmt->cookie, SDO_STANDARD_MASK);
 	/* XXX: forcing interlaced mode using undocumented bit */
 	sdo_write_mask(sdev, SDO_CONFIG, 0, SDO_PROGRESSIVE);
 	/* turn all VBI off */
 	sdo_write_mask(sdev, SDO_VBI, 0, SDO_CVBS_WSS_INS |
 		SDO_CVBS_CLOSED_CAPTION_MASK);
 	/* turn all post processing off */
 	sdo_write_mask(sdev, SDO_CCCON, ~0, SDO_COMPENSATION_BHS_ADJ_OFF |
 		SDO_COMPENSATION_CVBS_COMP_OFF);
 	sdo_reg_debug(sdev);
 	return 0;

 vdac_r_dis:
 	regulator_disable(sdev->vdac);
 dac_clk_dis:
 	clk_disable_unprepare(sdev->sclk_dac);
 	return ret;
 }

 static const struct dev_pm_ops sdo_pm_ops = {
 	.runtime_suspend = sdo_runtime_suspend,
 	.runtime_resume	 = sdo_runtime_resume,
 };

 static int sdo_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct sdo_device *sdev;
 	struct resource *res;
 	int ret = 0;
 	struct clk *sclk_vpll;

 	dev_info(dev, "probe start\n");
 	sdev = devm_kzalloc(&pdev->dev, sizeof(*sdev), GFP_KERNEL);
 	if (!sdev) {
 		dev_err(dev, "not enough memory.\n");
 		ret = -ENOMEM;
 		goto fail;
 	}
 	sdev->dev = dev;

 	/* mapping registers */
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (res == NULL) {
 		dev_err(dev, "get memory resource failed.\n");
 		ret = -ENXIO;
 		goto fail;
 	}

 	sdev->regs = devm_ioremap(&pdev->dev, res->start, resource_size(res));
 	if (sdev->regs == NULL) {
 		dev_err(dev, "register mapping failed.\n");
 		ret = -ENXIO;
 		goto fail;
 	}

 	/* acquiring interrupt */
 	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 	if (res == NULL) {
 		dev_err(dev, "get interrupt resource failed.\n");
 		ret = -ENXIO;
 		goto fail;
 	}
 	ret = devm_request_irq(&pdev->dev, res->start, sdo_irq_handler, 0,
 			       "s5p-sdo", sdev);
 	if (ret) {
 		dev_err(dev, "request interrupt failed.\n");
 		goto fail;
 	}
 	sdev->irq = res->start;

 	/* acquire clocks */
 	sdev->sclk_dac = clk_get(dev, "sclk_dac");
 	if (IS_ERR(sdev->sclk_dac)) {
 		dev_err(dev, "failed to get clock 'sclk_dac'\n");
 		ret = PTR_ERR(sdev->sclk_dac);
 		goto fail;
 	}
 	sdev->dac = clk_get(dev, "dac");
 	if (IS_ERR(sdev->dac)) {
 		dev_err(dev, "failed to get clock 'dac'\n");
 		ret = PTR_ERR(sdev->dac);
 		goto fail_sclk_dac;
 	}
 	sdev->dacphy = clk_get(dev, "dacphy");
 	if (IS_ERR(sdev->dacphy)) {
 		dev_err(dev, "failed to get clock 'dacphy'\n");
 		ret = PTR_ERR(sdev->dacphy);
 		goto fail_dac;
 	}
 	sclk_vpll = clk_get(dev, "sclk_vpll");
 	if (IS_ERR(sclk_vpll)) {
 		dev_err(dev, "failed to get clock 'sclk_vpll'\n");
 		ret = PTR_ERR(sclk_vpll);
 		goto fail_dacphy;
 	}
 	clk_set_parent(sdev->sclk_dac, sclk_vpll);
 	clk_put(sclk_vpll);
 	sdev->fout_vpll = clk_get(dev, "fout_vpll");
 	if (IS_ERR(sdev->fout_vpll)) {
 		dev_err(dev, "failed to get clock 'fout_vpll'\n");
 		ret = PTR_ERR(sdev->fout_vpll);
 		goto fail_dacphy;
 	}
 	dev_info(dev, "fout_vpll.rate = %lu\n", clk_get_rate(sclk_vpll));

 	/* acquire regulator */
 	sdev->vdac = devm_regulator_get(dev, "vdd33a_dac");
 	if (IS_ERR(sdev->vdac)) {
 		dev_err(dev, "failed to get regulator 'vdac'\n");
 		ret = PTR_ERR(sdev->vdac);
 		goto fail_fout_vpll;
 	}
 	sdev->vdet = devm_regulator_get(dev, "vdet");
 	if (IS_ERR(sdev->vdet)) {
 		dev_err(dev, "failed to get regulator 'vdet'\n");
 		ret = PTR_ERR(sdev->vdet);
 		goto fail_fout_vpll;
 	}

 	/* enable gate for dac clock, because mixer uses it */
 	ret = clk_prepare_enable(sdev->dac);
 	if (ret < 0) {
 		dev_err(dev, "clk_prepare_enable(dac) failed\n");
 		goto fail_fout_vpll;
 	}

 	/* configure power management */
 	pm_runtime_enable(dev);

 	/* configuration of interface subdevice */
 	v4l2_subdev_init(&sdev->sd, &sdo_sd_ops);
 	sdev->sd.owner = THIS_MODULE;
 	strlcpy(sdev->sd.name, "s5p-sdo", sizeof(sdev->sd.name));

 	/* set default format */
 	sdev->fmt = sdo_find_format(SDO_DEFAULT_STD);
 	BUG_ON(sdev->fmt == NULL);

 	/* keeping subdev in device's private for use by other drivers */
 	dev_set_drvdata(dev, &sdev->sd);

 	dev_info(dev, "probe succeeded\n");
 	return 0;

 fail_fout_vpll:
 	clk_put(sdev->fout_vpll);
 fail_dacphy:
 	clk_put(sdev->dacphy);
 fail_dac:
 	clk_put(sdev->dac);
 fail_sclk_dac:
 	clk_put(sdev->sclk_dac);
 fail:
 	dev_info(dev, "probe failed\n");
 	return ret;
 }

 static int sdo_remove(struct platform_device *pdev)
 {
 	struct v4l2_subdev *sd = dev_get_drvdata(&pdev->dev);
 	struct sdo_device *sdev = sd_to_sdev(sd);

 	pm_runtime_disable(&pdev->dev);
 	clk_disable_unprepare(sdev->dac);
 	clk_put(sdev->fout_vpll);
 	clk_put(sdev->dacphy);
 	clk_put(sdev->dac);
 	clk_put(sdev->sclk_dac);

 	dev_info(&pdev->dev, "remove successful\n");
 	return 0;
 }

 static struct platform_driver sdo_driver __refdata = {
 	.probe = sdo_probe,
 	.remove = sdo_remove,
 	.driver = {
 		.name = "s5p-sdo",
 		.owner = THIS_MODULE,
 		.pm = &sdo_pm_ops,
 	}
 };

 module_platform_driver(sdo_driver);
	/*
	* Samsung Standard Definition Output (SDO) driver
	*
	* Copyright (c) 2010-2011 Samsung Electronics Co., Ltd.
	*
	* Tomasz Stanislawski, <t.stanislaws@samsung.com>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published
	* by the Free Software Foundiation. either version 2 of the License,
	* or (at your option) any later version
	*/

	#include <linux/clk.h>
	#include <linux/delay.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/interrupt.h>
	#include <linux/io.h>
	#include <linux/irq.h>
	#include <linux/platform_device.h>
	#include <linux/pm_runtime.h>
	#include <linux/regulator/consumer.h>
	#include <linux/slab.h>

	#include <media/v4l2-subdev.h>

	#include "regs-sdo.h"

	MODULE_AUTHOR("Tomasz Stanislawski, <t.stanislaws@samsung.com>");
	MODULE_DESCRIPTION("Samsung Standard Definition Output (SDO)");
	MODULE_LICENSE("GPL");

	#define SDO_DEFAULT_STD V4L2_STD_PAL

	struct sdo_format {
	v4l2_std_id id;
	/* all modes are 720 pixels wide */
	unsigned int height;
	unsigned int cookie;
	};

	struct sdo_device {
	/** pointer to device parent */
	struct device *dev;
	/** base address of SDO registers */
	void __iomem *regs;
	/** SDO interrupt */
	unsigned int irq;
	/** DAC source clock */
	struct clk *sclk_dac;
	/** DAC clock */
	struct clk *dac;
	/** DAC physical interface */
	struct clk *dacphy;
	/** clock for control of VPLL */
	struct clk *fout_vpll;
	/** vpll rate before sdo stream was on */
	unsigned long vpll_rate;
	/** regulator for SDO IP power */
	struct regulator *vdac;
	/** regulator for SDO plug detection */
	struct regulator *vdet;
	/** subdev used as device interface */
	struct v4l2_subdev sd;
	/** current format */
	const struct sdo_format *fmt;
	};

	static inline struct sdo_device sd_to_sdev(struct v4l2_subdev sd)
	{
	return container_of(sd, struct sdo_device, sd);
	}

	static inline
	void sdo_write_mask(struct sdo_device *sdev, u32 reg_id, u32 value, u32 mask)
	{
	u32 old = readl(sdev->regs + reg_id);
	value = (value & mask) \| (old & ~mask);
	writel(value, sdev->regs + reg_id);
	}

	static inline
	void sdo_write(struct sdo_device *sdev, u32 reg_id, u32 value)
	{
	writel(value, sdev->regs + reg_id);
	}

	static inline
	u32 sdo_read(struct sdo_device *sdev, u32 reg_id)
	{
	return readl(sdev->regs + reg_id);
	}

	static irqreturn_t sdo_irq_handler(int irq, void *dev_data)
	{
	struct sdo_device *sdev = dev_data;

	/* clear interrupt */
	sdo_write_mask(sdev, SDO_IRQ, ~0, SDO_VSYNC_IRQ_PEND);
	return IRQ_HANDLED;
	}

	static void sdo_reg_debug(struct sdo_device *sdev)
	{
	#define DBGREG(reg_id) \
	dev_info(sdev->dev, #reg_id " = %08x\n", \
	sdo_read(sdev, reg_id))

	DBGREG(SDO_CLKCON);
	DBGREG(SDO_CONFIG);
	DBGREG(SDO_VBI);
	DBGREG(SDO_DAC);
	DBGREG(SDO_IRQ);
	DBGREG(SDO_IRQMASK);
	DBGREG(SDO_VERSION);
	}

	static const struct sdo_format sdo_format[] = {
	{ V4L2_STD_PAL_N, .height = 576, .cookie = SDO_PAL_N },
	{ V4L2_STD_PAL_Nc, .height = 576, .cookie = SDO_PAL_NC },
	{ V4L2_STD_PAL_M, .height = 480, .cookie = SDO_PAL_M },
	{ V4L2_STD_PAL_60, .height = 480, .cookie = SDO_PAL_60 },
	{ V4L2_STD_NTSC_443, .height = 480, .cookie = SDO_NTSC_443 },
	{ V4L2_STD_PAL, .height = 576, .cookie = SDO_PAL_BGHID },
	{ V4L2_STD_NTSC_M, .height = 480, .cookie = SDO_NTSC_M },
	};

	static const struct sdo_format *sdo_find_format(v4l2_std_id id)
	{
	int i;
	for (i = 0; i < ARRAY_SIZE(sdo_format); ++i)
	if (sdo_format[i].id & id)
	return &sdo_format[i];
	return NULL;
	}

	static int sdo_g_tvnorms_output(struct v4l2_subdev sd, v4l2_std_id std)
	{
	*std = V4L2_STD_NTSC_M \| V4L2_STD_PAL_M \| V4L2_STD_PAL \|
	V4L2_STD_PAL_N \| V4L2_STD_PAL_Nc \|
	V4L2_STD_NTSC_443 \| V4L2_STD_PAL_60;
	return 0;
	}

	static int sdo_s_std_output(struct v4l2_subdev *sd, v4l2_std_id std)
	{
	struct sdo_device *sdev = sd_to_sdev(sd);
	const struct sdo_format *fmt;
	fmt = sdo_find_format(std);
	if (fmt == NULL)
	return -EINVAL;
	sdev->fmt = fmt;
	return 0;
	}

	static int sdo_g_std_output(struct v4l2_subdev sd, v4l2_std_id std)
	{
	*std = sd_to_sdev(sd)->fmt->id;
	return 0;
	}

	static int sdo_g_mbus_fmt(struct v4l2_subdev *sd,
	struct v4l2_mbus_framefmt *fmt)
	{
	struct sdo_device *sdev = sd_to_sdev(sd);

	if (!sdev->fmt)
	return -ENXIO;
	/* all modes are 720 pixels wide */
	fmt->width = 720;
	fmt->height = sdev->fmt->height;
	fmt->code = V4L2_MBUS_FMT_FIXED;
	fmt->field = V4L2_FIELD_INTERLACED;
	fmt->colorspace = V4L2_COLORSPACE_JPEG;
	return 0;
	}

	static int sdo_s_power(struct v4l2_subdev *sd, int on)
	{
	struct sdo_device *sdev = sd_to_sdev(sd);
	struct device *dev = sdev->dev;
	int ret;

	dev_info(dev, "sdo_s_power(%d)\n", on);

	if (on)
	ret = pm_runtime_get_sync(dev);
	else
	ret = pm_runtime_put_sync(dev);

	/* only values < 0 indicate errors */
	return IS_ERR_VALUE(ret) ? ret : 0;
	}

	static int sdo_streamon(struct sdo_device *sdev)
	{
	int ret;

	/* set proper clock for Timing Generator */
	sdev->vpll_rate = clk_get_rate(sdev->fout_vpll);
	ret = clk_set_rate(sdev->fout_vpll, 54000000);
	if (ret < 0) {
	dev_err(sdev->dev, "Failed to set vpll rate\n");
	return ret;
	}
	dev_info(sdev->dev, "fout_vpll.rate = %lu\n",
	clk_get_rate(sdev->fout_vpll));
	/* enable clock in SDO */
	sdo_write_mask(sdev, SDO_CLKCON, ~0, SDO_TVOUT_CLOCK_ON);
	ret = clk_prepare_enable(sdev->dacphy);
	if (ret < 0) {
	dev_err(sdev->dev, "clk_prepare_enable(dacphy) failed\n");
	goto fail;
	}
	/* enable DAC */
	sdo_write_mask(sdev, SDO_DAC, ~0, SDO_POWER_ON_DAC);
	sdo_reg_debug(sdev);
	return 0;

	fail:
	sdo_write_mask(sdev, SDO_CLKCON, 0, SDO_TVOUT_CLOCK_ON);
	clk_set_rate(sdev->fout_vpll, sdev->vpll_rate);
	return ret;
	}

	static int sdo_streamoff(struct sdo_device *sdev)
	{
	int tries;

	sdo_write_mask(sdev, SDO_DAC, 0, SDO_POWER_ON_DAC);
	clk_disable_unprepare(sdev->dacphy);
	sdo_write_mask(sdev, SDO_CLKCON, 0, SDO_TVOUT_CLOCK_ON);
	for (tries = 100; tries; --tries) {
	if (sdo_read(sdev, SDO_CLKCON) & SDO_TVOUT_CLOCK_READY)
	break;
	mdelay(1);
	}
	if (tries == 0)
	dev_err(sdev->dev, "failed to stop streaming\n");
	clk_set_rate(sdev->fout_vpll, sdev->vpll_rate);
	return tries ? 0 : -EIO;
	}

	static int sdo_s_stream(struct v4l2_subdev *sd, int on)
	{
	struct sdo_device *sdev = sd_to_sdev(sd);
	return on ? sdo_streamon(sdev) : sdo_streamoff(sdev);
	}

	static const struct v4l2_subdev_core_ops sdo_sd_core_ops = {
	.s_power = sdo_s_power,
	};

	static const struct v4l2_subdev_video_ops sdo_sd_video_ops = {
	.s_std_output = sdo_s_std_output,
	.g_std_output = sdo_g_std_output,
	.g_tvnorms_output = sdo_g_tvnorms_output,
	.g_mbus_fmt = sdo_g_mbus_fmt,
	.s_stream = sdo_s_stream,
	};

	static const struct v4l2_subdev_ops sdo_sd_ops = {
	.core = &sdo_sd_core_ops,
	.video = &sdo_sd_video_ops,
	};

	static int sdo_runtime_suspend(struct device *dev)
	{
	struct v4l2_subdev *sd = dev_get_drvdata(dev);
	struct sdo_device *sdev = sd_to_sdev(sd);

	dev_info(dev, "suspend\n");
	regulator_disable(sdev->vdet);
	regulator_disable(sdev->vdac);
	clk_disable_unprepare(sdev->sclk_dac);
	return 0;
	}

	static int sdo_runtime_resume(struct device *dev)
	{
	struct v4l2_subdev *sd = dev_get_drvdata(dev);
	struct sdo_device *sdev = sd_to_sdev(sd);
	int ret;

	dev_info(dev, "resume\n");

	ret = clk_prepare_enable(sdev->sclk_dac);
	if (ret < 0)
	return ret;

	ret = regulator_enable(sdev->vdac);
	if (ret < 0)
	goto dac_clk_dis;

	ret = regulator_enable(sdev->vdet);
	if (ret < 0)
	goto vdac_r_dis;

	/* software reset */
	sdo_write_mask(sdev, SDO_CLKCON, ~0, SDO_TVOUT_SW_RESET);
	mdelay(10);
	sdo_write_mask(sdev, SDO_CLKCON, 0, SDO_TVOUT_SW_RESET);

	/* setting TV mode */
	sdo_write_mask(sdev, SDO_CONFIG, sdev->fmt->cookie, SDO_STANDARD_MASK);
	/* XXX: forcing interlaced mode using undocumented bit */
	sdo_write_mask(sdev, SDO_CONFIG, 0, SDO_PROGRESSIVE);
	/* turn all VBI off */
	sdo_write_mask(sdev, SDO_VBI, 0, SDO_CVBS_WSS_INS \|
	SDO_CVBS_CLOSED_CAPTION_MASK);
	/* turn all post processing off */
	sdo_write_mask(sdev, SDO_CCCON, ~0, SDO_COMPENSATION_BHS_ADJ_OFF \|
	SDO_COMPENSATION_CVBS_COMP_OFF);
	sdo_reg_debug(sdev);
	return 0;

	vdac_r_dis:
	regulator_disable(sdev->vdac);
	dac_clk_dis:
	clk_disable_unprepare(sdev->sclk_dac);
	return ret;
	}

	static const struct dev_pm_ops sdo_pm_ops = {
	.runtime_suspend = sdo_runtime_suspend,
	.runtime_resume = sdo_runtime_resume,
	};

	static int sdo_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct sdo_device *sdev;
	struct resource *res;
	int ret = 0;
	struct clk *sclk_vpll;

	dev_info(dev, "probe start\n");
	sdev = devm_kzalloc(&pdev->dev, sizeof(*sdev), GFP_KERNEL);
	if (!sdev) {
	dev_err(dev, "not enough memory.\n");
	ret = -ENOMEM;
	goto fail;
	}
	sdev->dev = dev;

	/* mapping registers */
	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (res == NULL) {
	dev_err(dev, "get memory resource failed.\n");
	ret = -ENXIO;
	goto fail;
	}

	sdev->regs = devm_ioremap(&pdev->dev, res->start, resource_size(res));
	if (sdev->regs == NULL) {
	dev_err(dev, "register mapping failed.\n");
	ret = -ENXIO;
	goto fail;
	}

	/* acquiring interrupt */
	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	if (res == NULL) {
	dev_err(dev, "get interrupt resource failed.\n");
	ret = -ENXIO;
	goto fail;
	}
	ret = devm_request_irq(&pdev->dev, res->start, sdo_irq_handler, 0,
	"s5p-sdo", sdev);
	if (ret) {
	dev_err(dev, "request interrupt failed.\n");
	goto fail;
	}
	sdev->irq = res->start;

	/* acquire clocks */
	sdev->sclk_dac = clk_get(dev, "sclk_dac");
	if (IS_ERR(sdev->sclk_dac)) {
	dev_err(dev, "failed to get clock 'sclk_dac'\n");
	ret = PTR_ERR(sdev->sclk_dac);
	goto fail;
	}
	sdev->dac = clk_get(dev, "dac");
	if (IS_ERR(sdev->dac)) {
	dev_err(dev, "failed to get clock 'dac'\n");
	ret = PTR_ERR(sdev->dac);
	goto fail_sclk_dac;
	}
	sdev->dacphy = clk_get(dev, "dacphy");
	if (IS_ERR(sdev->dacphy)) {
	dev_err(dev, "failed to get clock 'dacphy'\n");
	ret = PTR_ERR(sdev->dacphy);
	goto fail_dac;
	}
	sclk_vpll = clk_get(dev, "sclk_vpll");
	if (IS_ERR(sclk_vpll)) {
	dev_err(dev, "failed to get clock 'sclk_vpll'\n");
	ret = PTR_ERR(sclk_vpll);
	goto fail_dacphy;
	}
	clk_set_parent(sdev->sclk_dac, sclk_vpll);
	clk_put(sclk_vpll);
	sdev->fout_vpll = clk_get(dev, "fout_vpll");
	if (IS_ERR(sdev->fout_vpll)) {
	dev_err(dev, "failed to get clock 'fout_vpll'\n");
	ret = PTR_ERR(sdev->fout_vpll);
	goto fail_dacphy;
	}
	dev_info(dev, "fout_vpll.rate = %lu\n", clk_get_rate(sclk_vpll));

	/* acquire regulator */
	sdev->vdac = devm_regulator_get(dev, "vdd33a_dac");
	if (IS_ERR(sdev->vdac)) {
	dev_err(dev, "failed to get regulator 'vdac'\n");
	ret = PTR_ERR(sdev->vdac);
	goto fail_fout_vpll;
	}
	sdev->vdet = devm_regulator_get(dev, "vdet");
	if (IS_ERR(sdev->vdet)) {
	dev_err(dev, "failed to get regulator 'vdet'\n");
	ret = PTR_ERR(sdev->vdet);
	goto fail_fout_vpll;
	}

	/* enable gate for dac clock, because mixer uses it */
	ret = clk_prepare_enable(sdev->dac);
	if (ret < 0) {
	dev_err(dev, "clk_prepare_enable(dac) failed\n");
	goto fail_fout_vpll;
	}

	/* configure power management */
	pm_runtime_enable(dev);

	/* configuration of interface subdevice */
	v4l2_subdev_init(&sdev->sd, &sdo_sd_ops);
	sdev->sd.owner = THIS_MODULE;
	strlcpy(sdev->sd.name, "s5p-sdo", sizeof(sdev->sd.name));

	/* set default format */
	sdev->fmt = sdo_find_format(SDO_DEFAULT_STD);
	BUG_ON(sdev->fmt == NULL);

	/* keeping subdev in device's private for use by other drivers */
	dev_set_drvdata(dev, &sdev->sd);

	dev_info(dev, "probe succeeded\n");
	return 0;

	fail_fout_vpll:
	clk_put(sdev->fout_vpll);
	fail_dacphy:
	clk_put(sdev->dacphy);
	fail_dac:
	clk_put(sdev->dac);
	fail_sclk_dac:
	clk_put(sdev->sclk_dac);
	fail:
	dev_info(dev, "probe failed\n");
	return ret;
	}

	static int sdo_remove(struct platform_device *pdev)
	{
	struct v4l2_subdev *sd = dev_get_drvdata(&pdev->dev);
	struct sdo_device *sdev = sd_to_sdev(sd);

	pm_runtime_disable(&pdev->dev);
	clk_disable_unprepare(sdev->dac);
	clk_put(sdev->fout_vpll);
	clk_put(sdev->dacphy);
	clk_put(sdev->dac);
	clk_put(sdev->sclk_dac);

	dev_info(&pdev->dev, "remove successful\n");
	return 0;
	}

	static struct platform_driver sdo_driver __refdata = {
	.probe = sdo_probe,
	.remove = sdo_remove,
	.driver = {
	.name = "s5p-sdo",
	.owner = THIS_MODULE,
	.pm = &sdo_pm_ops,
	}
	};

	module_platform_driver(sdo_driver);