drivers/media/video/tda9840.c - kernel/msm-4.9 - Gitiles

  /*
     tda9840 - i2c-driver for the tda9840 by SGS Thomson

     Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>

     The tda9840 is a stereo/dual sound processor with digital
     identification. It can be found at address 0x84 on the i2c-bus.

     For detailed informations download the specifications directly
     from SGS Thomson at http://www.st.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.

     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/ioctl.h>
 #include <linux/i2c.h>

 #include "tda9840.h"

 static int debug = 0;		/* insmod parameter */
 module_param(debug, int, 0644);
 MODULE_PARM_DESC(debug, "Turn on/off device debugging (default:off).");
 #define dprintk(args...) \
             do { if (debug) { printk("%s: %s()[%d]: ",__stringify(KBUILD_MODNAME), __FUNCTION__, __LINE__); printk(args); } } while (0)

 #define	SWITCH		0x00
 #define	LEVEL_ADJUST	0x02
 #define	STEREO_ADJUST	0x03
 #define	TEST		0x04

 /* addresses to scan, found only at 0x42 (7-Bit) */
 static unsigned short normal_i2c[] = { I2C_TDA9840, I2C_CLIENT_END };

 /* magic definition of all other variables and things */
 I2C_CLIENT_INSMOD;

 static struct i2c_driver driver;
 static struct i2c_client client_template;

 static int command(struct i2c_client *client, unsigned int cmd, void *arg)
 {
 	int result;
 	int byte = *(int *)arg;

 	switch (cmd) {
 	case TDA9840_SWITCH:

 		dprintk("TDA9840_SWITCH: 0x%02x\n", byte);

 		if (byte != TDA9840_SET_MONO
 		    && byte != TDA9840_SET_MUTE
 		    && byte != TDA9840_SET_STEREO
 		    && byte != TDA9840_SET_LANG1
 		    && byte != TDA9840_SET_LANG2
 		    && byte != TDA9840_SET_BOTH
 		    && byte != TDA9840_SET_BOTH_R
 		    && byte != TDA9840_SET_EXTERNAL) {
 			return -EINVAL;
 		}

 		result = i2c_smbus_write_byte_data(client, SWITCH, byte);
 		if (result)
 			dprintk("i2c_smbus_write_byte() failed, ret:%d\n", result);
 		break;

 	case TDA9840_LEVEL_ADJUST:

 		dprintk("TDA9840_LEVEL_ADJUST: %d\n", byte);

 		/* check for correct range */
 		if (byte > 25 || byte < -20)
 			return -EINVAL;

 		/* calculate actual value to set, see specs, page 18 */
 		byte /= 5;
 		if (0 < byte)
 			byte += 0x8;
 		else
 			byte = -byte;

 		result = i2c_smbus_write_byte_data(client, LEVEL_ADJUST, byte);
 		if (result)
 			dprintk("i2c_smbus_write_byte() failed, ret:%d\n", result);
 		break;

 	case TDA9840_STEREO_ADJUST:

 		dprintk("TDA9840_STEREO_ADJUST: %d\n", byte);

 		/* check for correct range */
 		if (byte > 25 || byte < -24)
 			return -EINVAL;

 		/* calculate actual value to set */
 		byte /= 5;
 		if (0 < byte)
 			byte += 0x20;
 		else
 			byte = -byte;

 		result = i2c_smbus_write_byte_data(client, STEREO_ADJUST, byte);
 		if (result)
 			dprintk("i2c_smbus_write_byte() failed, ret:%d\n", result);
 		break;

 	case TDA9840_DETECT: {
 		int *ret = (int *)arg;

 		byte = i2c_smbus_read_byte_data(client, STEREO_ADJUST);
 		if (byte == -1) {
 			dprintk("i2c_smbus_read_byte_data() failed\n");
 			return -EIO;
 		}

 		if (0 != (byte & 0x80)) {
 			dprintk("TDA9840_DETECT: register contents invalid\n");
 			return -EINVAL;
 		}

 		dprintk("TDA9840_DETECT: byte: 0x%02x\n", byte);
 		*ret = ((byte & 0x60) >> 5);
 		result = 0;
 		break;
 	}
 	case TDA9840_TEST:
 		dprintk("TDA9840_TEST: 0x%02x\n", byte);

 		/* mask out irrelevant bits */
 		byte &= 0x3;

 		result = i2c_smbus_write_byte_data(client, TEST, byte);
 		if (result)
 			dprintk("i2c_smbus_write_byte() failed, ret:%d\n", result);
 		break;
 	default:
 		return -ENOIOCTLCMD;
 	}

 	if (result)
 		return -EIO;

 	return 0;
 }

 static int detect(struct i2c_adapter *adapter, int address, int kind)
 {
 	struct i2c_client *client;
 	int result = 0;

 	int byte = 0x0;

 	/* let's see whether this adapter can support what we need */
 	if (0 == i2c_check_functionality(adapter,
 				    I2C_FUNC_SMBUS_READ_BYTE_DATA |
 				    I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) {
 		return 0;
 	}

 	/* allocate memory for client structure */
 	client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
 	if (0 == client) {
 		printk("not enough kernel memory\n");
 		return -ENOMEM;
 	}

 	/* fill client structure */
 	memcpy(client, &client_template, sizeof(struct i2c_client));
 	client->addr = address;
 	client->adapter = adapter;

 	/* tell the i2c layer a new client has arrived */
 	if (0 != (result = i2c_attach_client(client))) {
 		kfree(client);
 		return result;
 	}

 	/* set initial values for level & stereo - adjustment, mode */
 	byte = 0;
 	result  = command(client, TDA9840_LEVEL_ADJUST, &byte);
 	result += command(client, TDA9840_STEREO_ADJUST, &byte);
 	byte = TDA9840_SET_MONO;
 	result = command(client, TDA9840_SWITCH, &byte);
 	if (result) {
 		dprintk("could not initialize tda9840\n");
 		return -ENODEV;
 	}

 	printk("tda9840: detected @ 0x%02x on adapter %s\n", address, &client->adapter->name[0]);
 	return 0;
 }

 static int attach(struct i2c_adapter *adapter)
 {
 	/* let's see whether this is a know adapter we can attach to */
 	if (adapter->id != I2C_ALGO_SAA7146) {
 		dprintk("refusing to probe on unknown adapter [name='%s',id=0x%x]\n", adapter->name, adapter->id);
 		return -ENODEV;
 	}

 	return i2c_probe(adapter, &addr_data, &detect);
 }

 static int detach(struct i2c_client *client)
 {
 	int ret = i2c_detach_client(client);
 	kfree(client);
 	return ret;
 }

 static struct i2c_driver driver = {
 	.owner	= THIS_MODULE,
 	.name	= "tda9840",
 	.id	= I2C_DRIVERID_TDA9840,
 	.flags	= I2C_DF_NOTIFY,
 	.attach_adapter	= attach,
 	.detach_client	= detach,
 	.command	= command,
 };

 static struct i2c_client client_template = {
 	I2C_DEVNAME("tda9840"),
 	.driver = &driver,
 };

 static int __init this_module_init(void)
 {
 	return i2c_add_driver(&driver);
 }

 static void __exit this_module_exit(void)
 {
 	i2c_del_driver(&driver);
 }

 module_init(this_module_init);
 module_exit(this_module_exit);

 MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
 MODULE_DESCRIPTION("tda9840 driver");
 MODULE_LICENSE("GPL");
	/*
	tda9840 - i2c-driver for the tda9840 by SGS Thomson

	Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>

	The tda9840 is a stereo/dual sound processor with digital
	identification. It can be found at address 0x84 on the i2c-bus.

	For detailed informations download the specifications directly
	from SGS Thomson at http://www.st.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.

	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/ioctl.h>
	#include <linux/i2c.h>

	#include "tda9840.h"

	static int debug = 0; /* insmod parameter */
	module_param(debug, int, 0644);
	MODULE_PARM_DESC(debug, "Turn on/off device debugging (default:off).");
	#define dprintk(args...) \
	do { if (debug) { printk("%s: %s()[%d]: ",__stringify(KBUILD_MODNAME), __FUNCTION__, __LINE__); printk(args); } } while (0)

	#define SWITCH 0x00
	#define LEVEL_ADJUST 0x02
	#define STEREO_ADJUST 0x03
	#define TEST 0x04

	/* addresses to scan, found only at 0x42 (7-Bit) */
	static unsigned short normal_i2c[] = { I2C_TDA9840, I2C_CLIENT_END };

	/* magic definition of all other variables and things */
	I2C_CLIENT_INSMOD;

	static struct i2c_driver driver;
	static struct i2c_client client_template;

	static int command(struct i2c_client client, unsigned int cmd, void arg)
	{
	int result;
	int byte = (int )arg;

	switch (cmd) {
	case TDA9840_SWITCH:

	dprintk("TDA9840_SWITCH: 0x%02x\n", byte);

	if (byte != TDA9840_SET_MONO
	&& byte != TDA9840_SET_MUTE
	&& byte != TDA9840_SET_STEREO
	&& byte != TDA9840_SET_LANG1
	&& byte != TDA9840_SET_LANG2
	&& byte != TDA9840_SET_BOTH
	&& byte != TDA9840_SET_BOTH_R
	&& byte != TDA9840_SET_EXTERNAL) {
	return -EINVAL;
	}

	result = i2c_smbus_write_byte_data(client, SWITCH, byte);
	if (result)
	dprintk("i2c_smbus_write_byte() failed, ret:%d\n", result);
	break;

	case TDA9840_LEVEL_ADJUST:

	dprintk("TDA9840_LEVEL_ADJUST: %d\n", byte);

	/* check for correct range */
	if (byte > 25 \|\| byte < -20)
	return -EINVAL;

	/* calculate actual value to set, see specs, page 18 */
	byte /= 5;
	if (0 < byte)
	byte += 0x8;
	else
	byte = -byte;

	result = i2c_smbus_write_byte_data(client, LEVEL_ADJUST, byte);
	if (result)
	dprintk("i2c_smbus_write_byte() failed, ret:%d\n", result);
	break;

	case TDA9840_STEREO_ADJUST:

	dprintk("TDA9840_STEREO_ADJUST: %d\n", byte);

	/* check for correct range */
	if (byte > 25 \|\| byte < -24)
	return -EINVAL;

	/* calculate actual value to set */
	byte /= 5;
	if (0 < byte)
	byte += 0x20;
	else
	byte = -byte;

	result = i2c_smbus_write_byte_data(client, STEREO_ADJUST, byte);
	if (result)
	dprintk("i2c_smbus_write_byte() failed, ret:%d\n", result);
	break;

	case TDA9840_DETECT: {
	int ret = (int )arg;

	byte = i2c_smbus_read_byte_data(client, STEREO_ADJUST);
	if (byte == -1) {
	dprintk("i2c_smbus_read_byte_data() failed\n");
	return -EIO;
	}

	if (0 != (byte & 0x80)) {
	dprintk("TDA9840_DETECT: register contents invalid\n");
	return -EINVAL;
	}

	dprintk("TDA9840_DETECT: byte: 0x%02x\n", byte);
	*ret = ((byte & 0x60) >> 5);
	result = 0;
	break;
	}
	case TDA9840_TEST:
	dprintk("TDA9840_TEST: 0x%02x\n", byte);

	/* mask out irrelevant bits */
	byte &= 0x3;

	result = i2c_smbus_write_byte_data(client, TEST, byte);
	if (result)
	dprintk("i2c_smbus_write_byte() failed, ret:%d\n", result);
	break;
	default:
	return -ENOIOCTLCMD;
	}

	if (result)
	return -EIO;

	return 0;
	}

	static int detect(struct i2c_adapter *adapter, int address, int kind)
	{
	struct i2c_client *client;
	int result = 0;

	int byte = 0x0;

	/* let's see whether this adapter can support what we need */
	if (0 == i2c_check_functionality(adapter,
	I2C_FUNC_SMBUS_READ_BYTE_DATA \|
	I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) {
	return 0;
	}

	/* allocate memory for client structure */
	client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
	if (0 == client) {
	printk("not enough kernel memory\n");
	return -ENOMEM;
	}

	/* fill client structure */
	memcpy(client, &client_template, sizeof(struct i2c_client));
	client->addr = address;
	client->adapter = adapter;

	/* tell the i2c layer a new client has arrived */
	if (0 != (result = i2c_attach_client(client))) {
	kfree(client);
	return result;
	}

	/* set initial values for level & stereo - adjustment, mode */
	byte = 0;
	result = command(client, TDA9840_LEVEL_ADJUST, &byte);
	result += command(client, TDA9840_STEREO_ADJUST, &byte);
	byte = TDA9840_SET_MONO;
	result = command(client, TDA9840_SWITCH, &byte);
	if (result) {
	dprintk("could not initialize tda9840\n");
	return -ENODEV;
	}

	printk("tda9840: detected @ 0x%02x on adapter %s\n", address, &client->adapter->name[0]);
	return 0;
	}

	static int attach(struct i2c_adapter *adapter)
	{
	/* let's see whether this is a know adapter we can attach to */
	if (adapter->id != I2C_ALGO_SAA7146) {
	dprintk("refusing to probe on unknown adapter [name='%s',id=0x%x]\n", adapter->name, adapter->id);
	return -ENODEV;
	}

	return i2c_probe(adapter, &addr_data, &detect);
	}

	static int detach(struct i2c_client *client)
	{
	int ret = i2c_detach_client(client);
	kfree(client);
	return ret;
	}

	static struct i2c_driver driver = {
	.owner = THIS_MODULE,
	.name = "tda9840",
	.id = I2C_DRIVERID_TDA9840,
	.flags = I2C_DF_NOTIFY,
	.attach_adapter = attach,
	.detach_client = detach,
	.command = command,
	};

	static struct i2c_client client_template = {
	I2C_DEVNAME("tda9840"),
	.driver = &driver,
	};

	static int __init this_module_init(void)
	{
	return i2c_add_driver(&driver);
	}

	static void __exit this_module_exit(void)
	{
	i2c_del_driver(&driver);
	}

	module_init(this_module_init);
	module_exit(this_module_exit);

	MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
	MODULE_DESCRIPTION("tda9840 driver");
	MODULE_LICENSE("GPL");