[PATCH] v4l: 816: added driver for cirrus logic low voltage stereo a-d converter

/*

 * cs53l32a (Adaptec AVC-2010 and AVC-2410) i2c ivtv driver.

 * Copyright (C) 2005  Martin Vaughan

 *

 * Audio source switching for Adaptec AVC-2410 added by Trev Jackson

 *

 * 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.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

 */

#include <linux/module.h>

#include <linux/types.h>

#include <linux/ioctl.h>

#include <asm/uaccess.h>

#include <linux/i2c.h>

#include <linux/videodev.h>

#include <media/audiochip.h>

#include <media/id.h>

MODULE_DESCRIPTION("i2c device driver for cs53l32a Audio ADC");

MODULE_AUTHOR("Martin Vaughan");

MODULE_LICENSE("GPL");

static int debug = 0;

module_param(debug, bool, 0644);

MODULE_PARM_DESC(debug, "Debugging messages\n\t\t\t0=Off (default), 1=On");

#define cs53l32a_dbg(fmt, arg...) \

	do { \

		if (debug) \

			printk(KERN_INFO "%s debug %d-%04x: " fmt, client->driver->name, \

			       i2c_adapter_id(client->adapter), client->addr , ## arg); \

	} while (0)

#define cs53l32a_err(fmt, arg...) do { \

	printk(KERN_ERR "%s %d-%04x: " fmt, client->driver->name, \

		i2c_adapter_id(client->adapter), client->addr , ## arg); } while (0)

#define cs53l32a_info(fmt, arg...) do { \

	printk(KERN_INFO "%s %d-%04x: " fmt, client->driver->name, \

		i2c_adapter_id(client->adapter), client->addr , ## arg); } while (0)

static unsigned short normal_i2c[] = { 0x22 >> 1, I2C_CLIENT_END };

I2C_CLIENT_INSMOD;

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

static int cs53l32a_write(struct i2c_client *client, u8 reg, u8 value)

{

	return i2c_smbus_write_byte_data(client, reg, value);

}

static int cs53l32a_read(struct i2c_client *client, u8 reg)

{

	return i2c_smbus_read_byte_data(client, reg);

}

static int cs53l32a_command(struct i2c_client *client, unsigned int cmd,

			    void *arg)

{

	int *input = arg;

	switch (cmd) {

	case AUDC_SET_INPUT:

		switch (*input) {

		case AUDIO_TUNER:

			cs53l32a_write(client, 0x01, 0x01);

			break;

		case AUDIO_EXTERN:

			cs53l32a_write(client, 0x01, 0x21);

			break;

		case AUDIO_MUTE:

			cs53l32a_write(client, 0x03, 0xF0);

			break;

		case AUDIO_UNMUTE:

			cs53l32a_write(client, 0x03, 0x30);

			break;

		default:

			cs53l32a_err("Invalid input %d.\n", *input);

			return -EINVAL;

		}

		break;

	case VIDIOC_S_CTRL:

		{

			struct v4l2_control *ctrl = arg;

			if (ctrl->id != V4L2_CID_AUDIO_VOLUME)

				return -EINVAL;

			if (ctrl->value > 12 || ctrl->value < -90)

				return -EINVAL;

			cs53l32a_write(client, 0x04, (u8) ctrl->value);

			cs53l32a_write(client, 0x05, (u8) ctrl->value);

			break;

		}

	case VIDIOC_LOG_STATUS:

		{

			u8 v = cs53l32a_read(client, 0x01);

			u8 m = cs53l32a_read(client, 0x03);

			cs53l32a_info("Input: %s%s\n",

				      v == 0x21 ? "external line in" : "tuner",

				      (m & 0xC0) ? " (muted)" : "");

			break;

		}

	default:

		return -EINVAL;

	}

	return 0;

}

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

/* i2c implementation */

/*

 * Generic i2c probe

 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'

 */

static struct i2c_driver i2c_driver;

static int cs53l32a_attach(struct i2c_adapter *adapter, int address, int kind)

{

	struct i2c_client *client;

	int i;

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

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))

		return 0;

	client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);

	if (client == 0)

		return -ENOMEM;

	memset(client, 0, sizeof(struct i2c_client));

	client->addr = address;

	client->adapter = adapter;

	client->driver = &i2c_driver;

	client->flags = I2C_CLIENT_ALLOW_USE;

	snprintf(client->name, sizeof(client->name) - 1, "cs53l32a");

	cs53l32a_info("chip found @ 0x%x (%s)\n", address << 1, adapter->name);

	for (i = 1; i <= 7; i++) {

		u8 v = cs53l32a_read(client, i);

		cs53l32a_dbg("Read Reg %d %02x\n", i, v);

	}

	/* Set cs53l32a internal register for Adaptec 2010/2410 setup */

	cs53l32a_write(client, 0x01, (u8) 0x21);

	cs53l32a_write(client, 0x02, (u8) 0x29);

	cs53l32a_write(client, 0x03, (u8) 0x30);

	cs53l32a_write(client, 0x04, (u8) 0x00);

	cs53l32a_write(client, 0x05, (u8) 0x00);

	cs53l32a_write(client, 0x06, (u8) 0x00);

	cs53l32a_write(client, 0x07, (u8) 0x00);

	/* Display results, should be 0x21,0x29,0x30,0x00,0x00,0x00,0x00 */

	for (i = 1; i <= 7; i++) {

		u8 v = cs53l32a_read(client, i);

		cs53l32a_dbg("Read Reg %d %02x\n", i, v);

	}

	i2c_attach_client(client);

	return 0;

}

static int cs53l32a_probe(struct i2c_adapter *adapter)

{

	return i2c_probe(adapter, &addr_data, cs53l32a_attach);

}

static int cs53l32a_detach(struct i2c_client *client)

{

	int err;

	err = i2c_detach_client(client);

	if (err) {

		return err;

	}

	kfree(client);

	return 0;

}

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

/* i2c implementation */

static struct i2c_driver i2c_driver = {

	.name = "cs53l32a",

	.id = I2C_DRIVERID_CS53L32A,

	.flags = I2C_DF_NOTIFY,

	.attach_adapter = cs53l32a_probe,

	.detach_client = cs53l32a_detach,

	.command = cs53l32a_command,

	.owner = THIS_MODULE,

};

static int __init cs53l32a_init_module(void)

{

	return i2c_add_driver(&i2c_driver);

}

static void __exit cs53l32a_cleanup_module(void)

{

	i2c_del_driver(&i2c_driver);

}

module_init(cs53l32a_init_module);

module_exit(cs53l32a_cleanup_module);