[mirror_ubuntu-artful-kernel.git] / drivers / media / video / tda9840.c

 /*
    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;		/* 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]: ", KBUILD_MODNAME, __func__, __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_ADDR_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 (!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_HW_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 = {
	.driver = {
		.name = "tda9840",
	},
	.id	= I2C_DRIVERID_TDA9840,
	.attach_adapter	= attach,
	.detach_client	= detach,
	.command	= command,
};

static struct i2c_client client_template = {
	.name = "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");
Commit	Line	Data
1da177e4 LT	1	/*
	2	tda9840 - i2c-driver for the tda9840 by SGS Thomson
	3
	4	Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
	5
	6	The tda9840 is a stereo/dual sound processor with digital
	7	identification. It can be found at address 0x84 on the i2c-bus.
	8
	9	For detailed informations download the specifications directly
	10	from SGS Thomson at http://www.st.com
	11
	12	This program is free software; you can redistribute it and/or modify
	13	it under the terms of the GNU General Public License as published by
	14	the Free Software Foundation; either version 2 of the License, or
	15	(at your option) any later version.
	16
	17	This program is distributed in the hope that it will be useful,
	18	but WITHOUT ANY WARRANTY; without even the implied warranty of
	19	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	20	GNU General Public License for more details.
	21
	22	You should have received a copy of the GNU General Public License
	23	along with this program; if not, write to the Free Software
	24	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	25	*/
	26
a8733ca5	27
1da177e4 LT	28	#include <linux/module.h>
	29	#include <linux/ioctl.h>
	30	#include <linux/i2c.h>
	31
	32	#include "tda9840.h"
	33
ff699e6b	34	static int debug; /* insmod parameter */
1da177e4 LT	35	module_param(debug, int, 0644);
1da177e4 LT	36	MODULE_PARM_DESC(debug, "Turn on/off device debugging (default:off).");
f87086e3	37
1da177e4	38	#define dprintk(args...) \
7e28adb2	39	do { if (debug) { printk("%s: %s()[%d]: ", KBUILD_MODNAME, __func__, __LINE__); printk(args); } } while (0)
1da177e4 LT	40
	41	#define SWITCH 0x00
	42	#define LEVEL_ADJUST 0x02
	43	#define STEREO_ADJUST 0x03
	44	#define TEST 0x04
	45
	46	/* addresses to scan, found only at 0x42 (7-Bit) */
09df1c16	47	static unsigned short normal_i2c[] = { I2C_ADDR_TDA9840, I2C_CLIENT_END };
1da177e4 LT	48
	49	/* magic definition of all other variables and things */
	50	I2C_CLIENT_INSMOD;
	51
	52	static struct i2c_driver driver;
	53	static struct i2c_client client_template;
	54
	55	static int command(struct i2c_client client, unsigned int cmd, void arg)
	56	{
	57	int result;
	58	int byte = (int )arg;
	59
	60	switch (cmd) {
	61	case TDA9840_SWITCH:
	62
	63	dprintk("TDA9840_SWITCH: 0x%02x\n", byte);
	64
	65	if (byte != TDA9840_SET_MONO
	66	&& byte != TDA9840_SET_MUTE
	67	&& byte != TDA9840_SET_STEREO
	68	&& byte != TDA9840_SET_LANG1
	69	&& byte != TDA9840_SET_LANG2
	70	&& byte != TDA9840_SET_BOTH
	71	&& byte != TDA9840_SET_BOTH_R
	72	&& byte != TDA9840_SET_EXTERNAL) {
	73	return -EINVAL;
	74	}
	75
	76	result = i2c_smbus_write_byte_data(client, SWITCH, byte);
	77	if (result)
	78	dprintk("i2c_smbus_write_byte() failed, ret:%d\n", result);
	79	break;
	80
	81	case TDA9840_LEVEL_ADJUST:
	82
	83	dprintk("TDA9840_LEVEL_ADJUST: %d\n", byte);
	84
	85	/* check for correct range */
	86	if (byte > 25 \|\| byte < -20)
	87	return -EINVAL;
	88
	89	/* calculate actual value to set, see specs, page 18 */
	90	byte /= 5;
	91	if (0 < byte)
	92	byte += 0x8;
	93	else
	94	byte = -byte;
	95
	96	result = i2c_smbus_write_byte_data(client, LEVEL_ADJUST, byte);
	97	if (result)
	98	dprintk("i2c_smbus_write_byte() failed, ret:%d\n", result);
	99	break;
	100
	101	case TDA9840_STEREO_ADJUST:
	102
	103	dprintk("TDA9840_STEREO_ADJUST: %d\n", byte);
	104
	105	/* check for correct range */
	106	if (byte > 25 \|\| byte < -24)
	107	return -EINVAL;
	108
	109	/* calculate actual value to set */
	110	byte /= 5;
	111	if (0 < byte)
112	byte += 0x20;
113	else
114	byte = -byte;
115
116	result = i2c_smbus_write_byte_data(client, STEREO_ADJUST, byte);
117	if (result)
118	dprintk("i2c_smbus_write_byte() failed, ret:%d\n", result);
119	break;
120
121	case TDA9840_DETECT: {
122	int ret = (int )arg;
123
124	byte = i2c_smbus_read_byte_data(client, STEREO_ADJUST);
125	if (byte == -1) {
126	dprintk("i2c_smbus_read_byte_data() failed\n");
127	return -EIO;
128	}
129
130	if (0 != (byte & 0x80)) {
131	dprintk("TDA9840_DETECT: register contents invalid\n");
132	return -EINVAL;
133	}
134
135	dprintk("TDA9840_DETECT: byte: 0x%02x\n", byte);
136	*ret = ((byte & 0x60) >> 5);
137	result = 0;
138	break;
139	}
140	case TDA9840_TEST:
141	dprintk("TDA9840_TEST: 0x%02x\n", byte);
142
143	/* mask out irrelevant bits */
144	byte &= 0x3;
145
146	result = i2c_smbus_write_byte_data(client, TEST, byte);
147	if (result)
148	dprintk("i2c_smbus_write_byte() failed, ret:%d\n", result);
149	break;
150	default:
151	return -ENOIOCTLCMD;
152	}
153
154	if (result)
155	return -EIO;
156
157	return 0;
158	}
159
160	static int detect(struct i2c_adapter *adapter, int address, int kind)
161	{
162	struct i2c_client *client;
163	int result = 0;
164
165	int byte = 0x0;
166
167	/* let's see whether this adapter can support what we need */
168	if (0 == i2c_check_functionality(adapter,
169	I2C_FUNC_SMBUS_READ_BYTE_DATA \|
170	I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) {
171	return 0;
172	}
173
174	/* allocate memory for client structure */
175	client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
5fa1247a	176	if (!client) {
1da177e4 LT	177	printk("not enough kernel memory\n");
	178	return -ENOMEM;
	179	}
	180
	181	/* fill client structure */
	182	memcpy(client, &client_template, sizeof(struct i2c_client));
	183	client->addr = address;
	184	client->adapter = adapter;
	185
	186	/* tell the i2c layer a new client has arrived */
	187	if (0 != (result = i2c_attach_client(client))) {
	188	kfree(client);
	189	return result;
	190	}
	191
	192	/* set initial values for level & stereo - adjustment, mode */
	193	byte = 0;
	194	result = command(client, TDA9840_LEVEL_ADJUST, &byte);
	195	result += command(client, TDA9840_STEREO_ADJUST, &byte);
	196	byte = TDA9840_SET_MONO;
	197	result = command(client, TDA9840_SWITCH, &byte);
	198	if (result) {
	199	dprintk("could not initialize tda9840\n");
	200	return -ENODEV;
	201	}
	202
	203	printk("tda9840: detected @ 0x%02x on adapter %s\n", address, &client->adapter->name[0]);
	204	return 0;
	205	}
	206
	207	static int attach(struct i2c_adapter *adapter)
	208	{
	209	/* let's see whether this is a know adapter we can attach to */
1684a984	210	if (adapter->id != I2C_HW_SAA7146) {
1da177e4 LT	211	dprintk("refusing to probe on unknown adapter [name='%s',id=0x%x]\n", adapter->name, adapter->id);
	212	return -ENODEV;
	213	}
	214
	215	return i2c_probe(adapter, &addr_data, &detect);
	216	}
	217
	218	static int detach(struct i2c_client *client)
	219	{
	220	int ret = i2c_detach_client(client);
	221	kfree(client);
	222	return ret;
	223	}
	224
	225	static struct i2c_driver driver = {
604f28e2	226	.driver = {
a8733ca5	227	.name = "tda9840",
604f28e2	228	},
1da177e4	229	.id = I2C_DRIVERID_TDA9840,
1da177e4 LT	230	.attach_adapter = attach,
	231	.detach_client = detach,
	232	.command = command,
	233	};
	234
	235	static struct i2c_client client_template = {
fae91e72	236	.name = "tda9840",
1da177e4 LT	237	.driver = &driver,
	238	};
	239
	240	static int __init this_module_init(void)
	241	{
	242	return i2c_add_driver(&driver);
	243	}
	244
	245	static void __exit this_module_exit(void)
	246	{
	247	i2c_del_driver(&driver);
	248	}
	249
	250	module_init(this_module_init);
	251	module_exit(this_module_exit);
	252
	253	MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
	254	MODULE_DESCRIPTION("tda9840 driver");
	255	MODULE_LICENSE("GPL");