Commit 56e1df49 authored by Tomasz Stanislawski's avatar Tomasz Stanislawski Committed by Mauro Carvalho Chehab
Browse files

[media] v4l: s5p-tv: add sii9234 driver 



SiI9234 is a converter of HDMI signal into MHL. The chip is present on some
boards from Samsung S5P family. The chip's configuration procedure is based on
MHD_SiI9234 driver created by doonsoo45.kim.

The driver is using:
- i2c framework
- v4l2 framework
- runtime PM

Signed-off-by: default avatarTomasz Stanislawski <t.stanislaws@samsung.com>
Signed-off-by: default avatarKyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent e861dccc

drivers/media/video/s5p-tv/Kconfig

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Original line number Diff line number Diff line
@@ -46,6 +46,16 @@ config VIDEO_SAMSUNG_S5P_HDMIPHY 
	  as module. It is an I2C driver, that exposes a V4L2

	  subdev for use by other drivers.



config VIDEO_SAMSUNG_S5P_SII9234

	tristate "Samsung SII9234 Driver"

	depends on VIDEO_DEV && VIDEO_V4L2 && I2C

	depends on VIDEO_SAMSUNG_S5P_TV

	help

	  Say Y here if you want support for the MHL interface

	  in S5P Samsung SoC. The driver can be compiled

	  as module. It is an I2C driver, that exposes a V4L2

	  subdev for use by other drivers.



config VIDEO_SAMSUNG_S5P_SDO

	tristate "Samsung Analog TV Driver"

	depends on VIDEO_DEV && VIDEO_V4L2

drivers/media/video/s5p-tv/Makefile

+2 −0
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@@ -8,6 +8,8 @@ 


obj-$(CONFIG_VIDEO_SAMSUNG_S5P_HDMIPHY) += s5p-hdmiphy.o

s5p-hdmiphy-y += hdmiphy_drv.o

obj-$(CONFIG_VIDEO_SAMSUNG_S5P_SII9234) += s5p-sii9234.o

s5p-sii9234-y += sii9234_drv.o

obj-$(CONFIG_VIDEO_SAMSUNG_S5P_HDMI) += s5p-hdmi.o

s5p-hdmi-y += hdmi_drv.o

obj-$(CONFIG_VIDEO_SAMSUNG_S5P_SDO) += s5p-sdo.o

drivers/media/video/s5p-tv/sii9234_drv.c

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/*

 * Samsung MHL interface driver

 *

 * Copyright (C) 2011 Samsung Electronics Co.Ltd

 * Author: 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 Foundation;  either version 2 of the  License, or (at your

 * option) any later version.

 */



#include <linux/delay.h>

#include <linux/err.h>

#include <linux/freezer.h>

#include <linux/gpio.h>

#include <linux/i2c.h>

#include <linux/interrupt.h>

#include <linux/irq.h>

#include <linux/kthread.h>

#include <linux/module.h>

#include <linux/pm_runtime.h>

#include <linux/regulator/machine.h>

#include <linux/slab.h>



#include <mach/gpio.h>

#include <plat/gpio-cfg.h>



#include <media/sii9234.h>

#include <media/v4l2-subdev.h>



MODULE_AUTHOR("Tomasz Stanislawski <t.stanislaws@samsung.com>");

MODULE_DESCRIPTION("Samsung MHL interface driver");

MODULE_LICENSE("GPL");



struct sii9234_context {

	struct i2c_client *client;

	struct regulator *power;

	int gpio_n_reset;

	struct v4l2_subdev sd;

};



static inline struct sii9234_context *sd_to_context(struct v4l2_subdev *sd)

{

	return container_of(sd, struct sii9234_context, sd);

}



static inline int sii9234_readb(struct i2c_client *client, int addr)

{

	return i2c_smbus_read_byte_data(client, addr);

}



static inline int sii9234_writeb(struct i2c_client *client, int addr, int value)

{

	return i2c_smbus_write_byte_data(client, addr, value);

}



static inline int sii9234_writeb_mask(struct i2c_client *client, int addr,

	int value, int mask)

{

	int ret;



	ret = i2c_smbus_read_byte_data(client, addr);

	if (ret < 0)

		return ret;

	ret = (ret & ~mask) | (value & mask);

	return i2c_smbus_write_byte_data(client, addr, ret);

}



static inline int sii9234_readb_idx(struct i2c_client *client, int addr)

{

	int ret;

	ret = i2c_smbus_write_byte_data(client, 0xbc, addr >> 8);

	if (ret < 0)

		return ret;

	ret = i2c_smbus_write_byte_data(client, 0xbd, addr & 0xff);

	if (ret < 0)

		return ret;

	return i2c_smbus_read_byte_data(client, 0xbe);

}



static inline int sii9234_writeb_idx(struct i2c_client *client, int addr,

	int value)

{

	int ret;

	ret = i2c_smbus_write_byte_data(client, 0xbc, addr >> 8);

	if (ret < 0)

		return ret;

	ret = i2c_smbus_write_byte_data(client, 0xbd, addr & 0xff);

	if (ret < 0)

		return ret;

	ret = i2c_smbus_write_byte_data(client, 0xbe, value);

	return ret;

}



static inline int sii9234_writeb_idx_mask(struct i2c_client *client, int addr,

	int value, int mask)

{

	int ret;



	ret = sii9234_readb_idx(client, addr);

	if (ret < 0)

		return ret;

	ret = (ret & ~mask) | (value & mask);

	return sii9234_writeb_idx(client, addr, ret);

}



static int sii9234_reset(struct sii9234_context *ctx)

{

	struct i2c_client *client = ctx->client;

	struct device *dev = &client->dev;

	int ret, tries;



	gpio_direction_output(ctx->gpio_n_reset, 1);

	mdelay(1);

	gpio_direction_output(ctx->gpio_n_reset, 0);

	mdelay(1);

	gpio_direction_output(ctx->gpio_n_reset, 1);

	mdelay(1);



	/* going to TTPI mode */

	ret = sii9234_writeb(client, 0xc7, 0);

	if (ret < 0) {

		dev_err(dev, "failed to set TTPI mode\n");

		return ret;

	}

	for (tries = 0; tries < 100 ; ++tries) {

		ret = sii9234_readb(client, 0x1b);

		if (ret > 0)

			break;

		if (ret < 0) {

			dev_err(dev, "failed to reset device\n");

			return -EIO;

		}

		mdelay(1);

	}

	if (tries == 100) {

		dev_err(dev, "maximal number of tries reached\n");

		return -EIO;

	}



	return 0;

}



static int sii9234_verify_version(struct i2c_client *client)

{

	struct device *dev = &client->dev;

	int family, rev, tpi_rev, dev_id, sub_id, hdcp, id;



	family = sii9234_readb(client, 0x1b);

	rev = sii9234_readb(client, 0x1c) & 0x0f;

	tpi_rev = sii9234_readb(client, 0x1d) & 0x7f;

	dev_id = sii9234_readb_idx(client, 0x0103);

	sub_id = sii9234_readb_idx(client, 0x0102);

	hdcp = sii9234_readb(client, 0x30);



	if (family < 0 || rev < 0 || tpi_rev < 0 || dev_id < 0 ||

		sub_id < 0 || hdcp < 0) {

		dev_err(dev, "failed to read chip's version\n");

		return -EIO;

	}



	id = (dev_id << 8) | sub_id;



	dev_info(dev, "chip: SiL%02x family: %02x, rev: %02x\n",

		id, family, rev);

	dev_info(dev, "tpi_rev:%02x, hdcp: %02x\n", tpi_rev, hdcp);

	if (id != 0x9234) {

		dev_err(dev, "not supported chip\n");

		return -ENODEV;

	}



	return 0;

}



static u8 data[][3] = {

/* setup from driver created by doonsoo45.kim */

	{ 0x01, 0x05, 0x04 }, /* Enable Auto soft reset on SCDT = 0 */

	{ 0x01, 0x08, 0x35 }, /* Power Up TMDS Tx Core */

	{ 0x01, 0x0d, 0x1c }, /* HDMI Transcode mode enable */

	{ 0x01, 0x2b, 0x01 }, /* Enable HDCP Compliance workaround */

	{ 0x01, 0x79, 0x40 }, /* daniel test...MHL_INT */

	{ 0x01, 0x80, 0x34 }, /* Enable Rx PLL Clock Value */

	{ 0x01, 0x90, 0x27 }, /* Enable CBUS discovery */

	{ 0x01, 0x91, 0xe5 }, /* Skip RGND detection */

	{ 0x01, 0x92, 0x46 }, /* Force MHD mode */

	{ 0x01, 0x93, 0xdc }, /* Disable CBUS pull-up during RGND measurement */

	{ 0x01, 0x94, 0x66 }, /* 1.8V CBUS VTH & GND threshold */

	{ 0x01, 0x95, 0x31 }, /* RGND block & single discovery attempt */

	{ 0x01, 0x96, 0x22 }, /* use 1K and 2K setting */

	{ 0x01, 0xa0, 0x10 }, /* SIMG: Term mode */

	{ 0x01, 0xa1, 0xfc }, /* Disable internal Mobile HD driver */

	{ 0x01, 0xa3, 0xfa }, /* SIMG: Output Swing  default EB, 3x Clk Mult */

	{ 0x01, 0xa5, 0x80 }, /* SIMG: RGND Hysterisis, 3x mode for Beast */

	{ 0x01, 0xa6, 0x0c }, /* SIMG: Swing Offset */

	{ 0x02, 0x3d, 0x3f }, /* Power up CVCC 1.2V core */

	{ 0x03, 0x00, 0x00 }, /* SIMG: correcting HW default */

	{ 0x03, 0x11, 0x01 }, /* Enable TxPLL Clock */

	{ 0x03, 0x12, 0x15 }, /* Enable Tx Clock Path & Equalizer */

	{ 0x03, 0x13, 0x60 }, /* SIMG: Set termination value */

	{ 0x03, 0x14, 0xf0 }, /* SIMG: Change CKDT level */

	{ 0x03, 0x17, 0x07 }, /* SIMG: PLL Calrefsel */

	{ 0x03, 0x1a, 0x20 }, /* VCO Cal */

	{ 0x03, 0x22, 0xe0 }, /* SIMG: Auto EQ */

	{ 0x03, 0x23, 0xc0 }, /* SIMG: Auto EQ */

	{ 0x03, 0x24, 0xa0 }, /* SIMG: Auto EQ */

	{ 0x03, 0x25, 0x80 }, /* SIMG: Auto EQ */

	{ 0x03, 0x26, 0x60 }, /* SIMG: Auto EQ */

	{ 0x03, 0x27, 0x40 }, /* SIMG: Auto EQ */

	{ 0x03, 0x28, 0x20 }, /* SIMG: Auto EQ */

	{ 0x03, 0x29, 0x00 }, /* SIMG: Auto EQ */

	{ 0x03, 0x31, 0x0b }, /* SIMG: Rx PLL BW value from I2C BW ~ 4MHz */

	{ 0x03, 0x45, 0x06 }, /* SIMG: DPLL Mode */

	{ 0x03, 0x4b, 0x06 }, /* SIMG: Correcting HW default */

	{ 0x03, 0x4c, 0xa0 }, /* Manual zone control */

	{ 0x03, 0x4d, 0x02 }, /* SIMG: PLL Mode Value (order is important) */

};



static int sii9234_set_internal(struct sii9234_context *ctx)

{

	struct i2c_client *client = ctx->client;

	int i, ret;



	for (i = 0; i < ARRAY_SIZE(data); ++i) {

		int addr = (data[i][0] << 8) | data[i][1];

		ret = sii9234_writeb_idx(client, addr, data[i][2]);

		if (ret < 0)

			return ret;

	}

	return 0;

}



static int sii9234_runtime_suspend(struct device *dev)

{

	struct v4l2_subdev *sd = dev_get_drvdata(dev);

	struct sii9234_context *ctx = sd_to_context(sd);

	struct i2c_client *client = ctx->client;



	dev_info(dev, "suspend start\n");



	sii9234_writeb_mask(client, 0x1e, 3, 3);

	regulator_disable(ctx->power);



	return 0;

}



static int sii9234_runtime_resume(struct device *dev)

{

	struct v4l2_subdev *sd = dev_get_drvdata(dev);

	struct sii9234_context *ctx = sd_to_context(sd);

	struct i2c_client *client = ctx->client;

	int ret;



	dev_info(dev, "resume start\n");

	regulator_enable(ctx->power);



	ret = sii9234_reset(ctx);

	if (ret)

		goto fail;



	/* enable tpi */

	ret = sii9234_writeb_mask(client, 0x1e, 1, 0);

	if (ret < 0)

		goto fail;

	ret = sii9234_set_internal(ctx);

	if (ret < 0)

		goto fail;



	return 0;



fail:

	dev_err(dev, "failed to resume\n");

	regulator_disable(ctx->power);



	return ret;

}



static const struct dev_pm_ops sii9234_pm_ops = {

	.runtime_suspend = sii9234_runtime_suspend,

	.runtime_resume	 = sii9234_runtime_resume,

};



static int sii9234_s_power(struct v4l2_subdev *sd, int on)

{

	struct sii9234_context *ctx = sd_to_context(sd);

	int ret;



	if (on)

		ret = pm_runtime_get_sync(&ctx->client->dev);

	else

		ret = pm_runtime_put(&ctx->client->dev);

	/* only values < 0 indicate errors */

	return IS_ERR_VALUE(ret) ? ret : 0;

}



static int sii9234_s_stream(struct v4l2_subdev *sd, int enable)

{

	struct sii9234_context *ctx = sd_to_context(sd);



	/* (dis/en)able TDMS output */

	sii9234_writeb_mask(ctx->client, 0x1a, enable ? 0 : ~0 , 1 << 4);

	return 0;

}



static const struct v4l2_subdev_core_ops sii9234_core_ops = {

	.s_power =  sii9234_s_power,

};



static const struct v4l2_subdev_video_ops sii9234_video_ops = {

	.s_stream =  sii9234_s_stream,

};



static const struct v4l2_subdev_ops sii9234_ops = {

	.core = &sii9234_core_ops,

	.video = &sii9234_video_ops,

};



static int __devinit sii9234_probe(struct i2c_client *client,

	const struct i2c_device_id *id)

{

	struct device *dev = &client->dev;

	struct sii9234_platform_data *pdata = dev->platform_data;

	struct sii9234_context *ctx;

	int ret;



	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);

	if (!ctx) {

		dev_err(dev, "out of memory\n");

		ret = -ENOMEM;

		goto fail;

	}

	ctx->client = client;



	ctx->power = regulator_get(dev, "hdmi-en");

	if (IS_ERR(ctx->power)) {

		dev_err(dev, "failed to acquire regulator hdmi-en\n");

		ret = PTR_ERR(ctx->power);

		goto fail_ctx;

	}



	ctx->gpio_n_reset = pdata->gpio_n_reset;

	ret = gpio_request(ctx->gpio_n_reset, "MHL_RST");

	if (ret) {

		dev_err(dev, "failed to acquire MHL_RST gpio\n");

		goto fail_power;

	}



	v4l2_i2c_subdev_init(&ctx->sd, client, &sii9234_ops);



	pm_runtime_enable(dev);



	/* enable device */

	ret = pm_runtime_get_sync(dev);

	if (ret)

		goto fail_pm;



	/* verify chip version */

	ret = sii9234_verify_version(client);

	if (ret)

		goto fail_pm_get;



	/* stop processing */

	pm_runtime_put(dev);



	dev_info(dev, "probe successful\n");



	return 0;



fail_pm_get:

	pm_runtime_put_sync(dev);



fail_pm:

	pm_runtime_disable(dev);

	gpio_free(ctx->gpio_n_reset);



fail_power:

	regulator_put(ctx->power);



fail_ctx:

	kfree(ctx);



fail:

	dev_err(dev, "probe failed\n");



	return ret;

}



static int __devexit sii9234_remove(struct i2c_client *client)

{

	struct device *dev = &client->dev;

	struct v4l2_subdev *sd = i2c_get_clientdata(client);

	struct sii9234_context *ctx = sd_to_context(sd);



	pm_runtime_disable(dev);

	gpio_free(ctx->gpio_n_reset);

	regulator_put(ctx->power);

	kfree(ctx);



	dev_info(dev, "remove successful\n");



	return 0;

}





static const struct i2c_device_id sii9234_id[] = {

	{ "SII9234", 0 },

	{ },

};



MODULE_DEVICE_TABLE(i2c, sii9234_id);

static struct i2c_driver sii9234_driver = {

	.driver = {

		.name	= "sii9234",

		.owner	= THIS_MODULE,

		.pm = &sii9234_pm_ops,

	},

	.probe		= sii9234_probe,

	.remove		= __devexit_p(sii9234_remove),

	.id_table = sii9234_id,

};



static int __init sii9234_init(void)

{

	return i2c_add_driver(&sii9234_driver);

}

module_init(sii9234_init);



static void __exit sii9234_exit(void)

{

	i2c_del_driver(&sii9234_driver);

}

module_exit(sii9234_exit);

include/media/sii9234.h

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/*

 * Driver header for SII9234 MHL converter chip.

 *

 * Copyright (c) 2011 Samsung Electronics, Co. Ltd

 * Contact: 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 Foundation; either version 2 of the License, or

 * (at your option) any later version.

 */



#ifndef SII9234_H

#define SII9234_H



/**

 * @gpio_n_reset: GPIO driving nRESET pin

 */



struct sii9234_platform_data {

	int gpio_n_reset;

};



#endif /* SII9234_H */

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