Commit fc279cc2 authored by Hans Verkuil's avatar Hans Verkuil Committed by Mauro Carvalho Chehab
Browse files

[media] cs3308: add new 8-channel volume control driver 



Add simple support for this 8 channel volume control driver.
Currently all it does is to unmute all 8 channels.

Based upon Devin's initial patch made for an older kernel which I
cleaned up and rebased. Thanks to Kernel Labs for that work.

Signed-off-by: default avatarDevin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: default avatarHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@osg.samsung.com>
parent bfd1bbfb

MAINTAINERS

+9 −0
Original line number Diff line number Diff line
@@ -3094,6 +3094,15 @@ S: Maintained 
F:	crypto/ansi_cprng.c

F:	crypto/rng.c



CS3308 MEDIA DRIVER

M:	Hans Verkuil <hverkuil@xs4all.nl>

L:	linux-media@vger.kernel.org

T:	git git://linuxtv.org/media_tree.git

W:	http://linuxtv.org

S:	Odd Fixes

F:	drivers/media/i2c/cs3308.c

F:	drivers/media/i2c/cs3308.h



CS5535 Audio ALSA driver

M:	Jaya Kumar <jayakumar.alsa@gmail.com>

S:	Maintained

drivers/media/i2c/Kconfig

+10 −0
Original line number Diff line number Diff line
@@ -83,6 +83,16 @@ config VIDEO_MSP3400 
	  To compile this driver as a module, choose M here: the

	  module will be called msp3400.



config VIDEO_CS3308

	tristate "Cirrus Logic CS3308 audio ADC"

	depends on VIDEO_V4L2 && I2C

	---help---

	  Support for the Cirrus Logic CS3308 High Performance 8-Channel

	  Analog Volume Control



	  To compile this driver as a module, choose M here: the

	  module will be called cs3308.



config VIDEO_CS5345

	tristate "Cirrus Logic CS5345 audio ADC"

	depends on VIDEO_V4L2 && I2C

drivers/media/i2c/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -43,6 +43,7 @@ obj-$(CONFIG_VIDEO_TVP7002) += tvp7002.o 
obj-$(CONFIG_VIDEO_TW2804) += tw2804.o

obj-$(CONFIG_VIDEO_TW9903) += tw9903.o

obj-$(CONFIG_VIDEO_TW9906) += tw9906.o

obj-$(CONFIG_VIDEO_CS3308) += cs3308.o

obj-$(CONFIG_VIDEO_CS5345) += cs5345.o

obj-$(CONFIG_VIDEO_CS53L32A) += cs53l32a.o

obj-$(CONFIG_VIDEO_M52790) += m52790.o

drivers/media/i2c/cs3308.c

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/*

 * Cirrus Logic cs3308 8-Channel Analog Volume Control

 *

 * Copyright (C) 2010 Devin Heitmueller <dheitmueller@kernellabs.com>

 * Copyright (C) 2012 Steven Toth <stoth@kernellabs.com>

 *

 * Derived from cs5345.c Copyright (C) 2007 Hans Verkuil

 *

 * 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.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 */





#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/i2c.h>

#include <linux/slab.h>

#include <linux/videodev2.h>

#include <media/v4l2-device.h>



MODULE_DESCRIPTION("i2c device driver for cs3308 8-channel volume control");

MODULE_AUTHOR("Devin Heitmueller");

MODULE_LICENSE("GPL");



static inline int cs3308_write(struct v4l2_subdev *sd, u8 reg, u8 value)

{

	struct i2c_client *client = v4l2_get_subdevdata(sd);



	return i2c_smbus_write_byte_data(client, reg, value);

}



static inline int cs3308_read(struct v4l2_subdev *sd, u8 reg)

{

	struct i2c_client *client = v4l2_get_subdevdata(sd);



	return i2c_smbus_read_byte_data(client, reg);

}



#ifdef CONFIG_VIDEO_ADV_DEBUG

static int cs3308_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)

{

	reg->val = cs3308_read(sd, reg->reg & 0xffff);

	reg->size = 1;

	return 0;

}



static int cs3308_s_register(struct v4l2_subdev *sd, const struct v4l2_dbg_register *reg)

{

	cs3308_write(sd, reg->reg & 0xffff, reg->val & 0xff);

	return 0;

}

#endif



/* ----------------------------------------------------------------------- */



static const struct v4l2_subdev_core_ops cs3308_core_ops = {

#ifdef CONFIG_VIDEO_ADV_DEBUG

	.g_register = cs3308_g_register,

	.s_register = cs3308_s_register,

#endif

};



static const struct v4l2_subdev_ops cs3308_ops = {

	.core = &cs3308_core_ops,

};



/* ----------------------------------------------------------------------- */



static int cs3308_probe(struct i2c_client *client,

			const struct i2c_device_id *id)

{

	struct v4l2_subdev *sd;

	unsigned i;



	/* Check if the adapter supports the needed features */

	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))

		return -EIO;



	if ((i2c_smbus_read_byte_data(client, 0x1c) & 0xf0) != 0xe0)

		return -ENODEV;



	v4l_info(client, "chip found @ 0x%x (%s)\n",

		 client->addr << 1, client->adapter->name);



	sd = kzalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);

	if (sd == NULL)

		return -ENOMEM;



	v4l2_i2c_subdev_init(sd, client, &cs3308_ops);



	/* Set some reasonable defaults */

	cs3308_write(sd, 0x0d, 0x00); /* Power up all channels */

	cs3308_write(sd, 0x0e, 0x00); /* Master Power */

	cs3308_write(sd, 0x0b, 0x00); /* Device Configuration */

	/* Set volume for each channel */

	for (i = 1; i <= 8; i++)

		cs3308_write(sd, i, 0xd2);

	cs3308_write(sd, 0x0a, 0x00); /* Unmute all channels */

	return 0;

}



/* ----------------------------------------------------------------------- */



static int cs3308_remove(struct i2c_client *client)

{

	struct v4l2_subdev *sd = i2c_get_clientdata(client);



	v4l2_device_unregister_subdev(sd);

	kfree(sd);

	return 0;

}



/* ----------------------------------------------------------------------- */



static const struct i2c_device_id cs3308_id[] = {

	{ "cs3308", 0 },

	{ }

};

MODULE_DEVICE_TABLE(i2c, cs3308_id);



static struct i2c_driver cs3308_driver = {

	.driver = {

		.owner  = THIS_MODULE,

		.name   = "cs3308",

	},

	.probe          = cs3308_probe,

	.remove         = cs3308_remove,

	.id_table       = cs3308_id,

};



module_i2c_driver(cs3308_driver);

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