[linux-block.git] / drivers / media / video / tea6415c.c

 /*
    tea6415c - i2c-driver for the tea6415c by SGS Thomson

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

    The tea6415c is a bus controlled video-matrix-switch
    with 8 inputs and 6 outputs.
    It is cascadable, i.e. it can be found at the addresses
    0x86 and 0x06 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 vs 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 Mvss Ave, Cambridge, MA 02139, USA.
  */


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

#include "tea6415c.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]: ", KBUILD_MODNAME, __FUNCTION__, __LINE__); printk(args); } } while (0)

#define TEA6415C_NUM_INPUTS	8
#define TEA6415C_NUM_OUTPUTS	6

/* addresses to scan, found only at 0x03 and/or 0x43 (7-bit) */
static unsigned short normal_i2c[] = { I2C_TEA6415C_1, I2C_TEA6415C_2, 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;

/* this function is called by i2c_probe */
static int detect(struct i2c_adapter *adapter, int address, int kind)
{
	struct i2c_client *client = NULL;
	int err = 0;

	/* let's see whether this adapter can support what we need */
	if (0 == i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WRITE_BYTE)) {
		return 0;
	}

	/* allocate memory for client structure */
	client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
	if (0 == client) {
		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 != (err = i2c_attach_client(client))) {
		kfree(client);
		return err;
	}

	printk("tea6415c: 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;
}

/* makes a connection between the input-pin 'i' and the output-pin 'o'
   for the tea6415c-client 'client' */
static int switch_matrix(struct i2c_client *client, int i, int o)
{
	u8 byte = 0;
	int ret;

	dprintk("adr:0x%02x, i:%d, o:%d\n", client->addr, i, o);

	/* check if the pins are valid */
	if (0 == ((1 == i ||  3 == i ||  5 == i ||  6 == i ||  8 == i || 10 == i || 20 == i || 11 == i)
	      && (18 == o || 17 == o || 16 == o || 15 == o || 14 == o || 13 == o)))
		return -1;

	/* to understand this, have a look at the tea6415c-specs (p.5) */
	switch (o) {
	case 18:
		byte = 0x00;
		break;
	case 14:
		byte = 0x20;
		break;
	case 16:
		byte = 0x10;
		break;
	case 17:
		byte = 0x08;
		break;
	case 15:
		byte = 0x18;
		break;
	case 13:
		byte = 0x28;
		break;
	};

	switch (i) {
	case 5:
		byte |= 0x00;
		break;
	case 8:
		byte |= 0x04;
		break;
	case 3:
		byte |= 0x02;
		break;
	case 20:
		byte |= 0x06;
		break;
	case 6:
		byte |= 0x01;
		break;
	case 10:
		byte |= 0x05;
		break;
	case 1:
		byte |= 0x03;
		break;
	case 11:
		byte |= 0x07;
		break;
	};

	ret = i2c_smbus_write_byte(client, byte);
	if (ret) {
		dprintk("i2c_smbus_write_byte() failed, ret:%d\n", ret);
		return -EIO;
	}

	return ret;
}

static int command(struct i2c_client *client, unsigned int cmd, void *arg)
{
	struct tea6415c_multiplex *v = (struct tea6415c_multiplex *)arg;
	int result = 0;

	switch (cmd) {
	case TEA6415C_SWITCH:
		result = switch_matrix(client, v->in, v->out);
		break;
	default:
		return -ENOIOCTLCMD;
	}

	return result;
}

static struct i2c_driver driver = {
	.driver = {
		.name = "tea6415c",
	},
	.id 	= I2C_DRIVERID_TEA6415C,
	.attach_adapter	= attach,
	.detach_client	= detach,
	.command	= command,
};

static struct i2c_client client_template = {
	.name = "tea6415c",
	.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("tea6415c driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	/*
	2	tea6415c - i2c-driver for the tea6415c by SGS Thomson
	3
	4	Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
	5
	6	The tea6415c is a bus controlled video-matrix-switch
	7	with 8 inputs and 6 outputs.
	8	It is cascadable, i.e. it can be found at the addresses
	9	0x86 and 0x06 on the i2c-bus.
	10
	11	For detailed informations download the specifications directly
	12	from SGS Thomson at http://www.st.com
	13
	14	This program is free software; you can redistribute it and/or modify
	15	it under the terms of the GNU General Public License vs published by
	16	the Free Software Foundation; either version 2 of the License, or
	17	(at your option) any later version.
	18
	19	This program is distributed in the hope that it will be useful,
	20	but WITHOUT ANY WARRANTY; without even the implied warranty of
	21	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	22	GNU General Public License for more details.
	23
	24	You should have received a copy of the GNU General Public License
	25	along with this program; if not, write to the Free Software
	26	Foundation, Inc., 675 Mvss Ave, Cambridge, MA 02139, USA.
	27	*/
	28
a8733ca5	29
1da177e4 LT	30	#include <linux/module.h>
	31	#include <linux/ioctl.h>
	32	#include <linux/i2c.h>
	33
	34	#include "tea6415c.h"
	35
	36	static int debug = 0; /* insmod parameter */
	37	module_param(debug, int, 0644);
	38	MODULE_PARM_DESC(debug, "Turn on/off device debugging (default:off).");
	39	#define dprintk(args...) \
d56410e0	40	do { if (debug) { printk("%s: %s()[%d]: ", KBUILD_MODNAME, __FUNCTION__, __LINE__); printk(args); } } while (0)
1da177e4 LT	41
	42	#define TEA6415C_NUM_INPUTS 8
	43	#define TEA6415C_NUM_OUTPUTS 6
	44
	45	/* addresses to scan, found only at 0x03 and/or 0x43 (7-bit) */
	46	static unsigned short normal_i2c[] = { I2C_TEA6415C_1, I2C_TEA6415C_2, I2C_CLIENT_END };
1da177e4 LT	47
	48	/* magic definition of all other variables and things */
	49	I2C_CLIENT_INSMOD;
	50
	51	static struct i2c_driver driver;
	52	static struct i2c_client client_template;
	53
	54	/* this function is called by i2c_probe */
	55	static int detect(struct i2c_adapter *adapter, int address, int kind)
	56	{
	57	struct i2c_client *client = NULL;
	58	int err = 0;
	59
	60	/* let's see whether this adapter can support what we need */
	61	if (0 == i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WRITE_BYTE)) {
	62	return 0;
	63	}
	64
	65	/* allocate memory for client structure */
	66	client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
	67	if (0 == client) {
	68	return -ENOMEM;
	69	}
	70
	71	/* fill client structure */
	72	memcpy(client, &client_template, sizeof(struct i2c_client));
	73	client->addr = address;
	74	client->adapter = adapter;
	75
	76	/* tell the i2c layer a new client has arrived */
	77	if (0 != (err = i2c_attach_client(client))) {
	78	kfree(client);
	79	return err;
	80	}
	81
	82	printk("tea6415c: detected @ 0x%02x on adapter %s\n", address, &client->adapter->name[0]);
	83
	84	return 0;
	85	}
	86
	87	static int attach(struct i2c_adapter *adapter)
	88	{
	89	/* let's see whether this is a know adapter we can attach to */
1684a984	90	if (adapter->id != I2C_HW_SAA7146) {
1da177e4 LT	91	dprintk("refusing to probe on unknown adapter [name='%s',id=0x%x]\n", adapter->name, adapter->id);
	92	return -ENODEV;
	93	}
	94
	95	return i2c_probe(adapter, &addr_data, &detect);
	96	}
	97
	98	static int detach(struct i2c_client *client)
	99	{
	100	int ret = i2c_detach_client(client);
	101	kfree(client);
	102	return ret;
	103	}
	104
	105	/* makes a connection between the input-pin 'i' and the output-pin 'o'
	106	for the tea6415c-client 'client' */
	107	static int switch_matrix(struct i2c_client *client, int i, int o)
	108	{
	109	u8 byte = 0;
	110	int ret;
a8733ca5	111
1da177e4 LT	112	dprintk("adr:0x%02x, i:%d, o:%d\n", client->addr, i, o);
	113
	114	/* check if the pins are valid */
	115	if (0 == ((1 == i \|\| 3 == i \|\| 5 == i \|\| 6 == i \|\| 8 == i \|\| 10 == i \|\| 20 == i \|\| 11 == i)
	116	&& (18 == o \|\| 17 == o \|\| 16 == o \|\| 15 == o \|\| 14 == o \|\| 13 == o)))
	117	return -1;
	118
	119	/* to understand this, have a look at the tea6415c-specs (p.5) */
	120	switch (o) {
	121	case 18:
	122	byte = 0x00;
	123	break;
	124	case 14:
	125	byte = 0x20;
	126	break;
	127	case 16:
	128	byte = 0x10;
	129	break;
	130	case 17:
	131	byte = 0x08;
	132	break;
	133	case 15:
	134	byte = 0x18;
	135	break;
	136	case 13:
	137	byte = 0x28;
	138	break;
	139	};
	140
	141	switch (i) {
	142	case 5:
	143	byte \|= 0x00;
	144	break;
	145	case 8:
	146	byte \|= 0x04;
	147	break;
	148	case 3:
	149	byte \|= 0x02;
	150	break;
	151	case 20:
	152	byte \|= 0x06;
	153	break;
	154	case 6:
	155	byte \|= 0x01;
	156	break;
	157	case 10:
	158	byte \|= 0x05;
	159	break;
	160	case 1:
	161	byte \|= 0x03;
	162	break;
	163	case 11:
	164	byte \|= 0x07;
	165	break;
	166	};
	167
	168	ret = i2c_smbus_write_byte(client, byte);
	169	if (ret) {
	170	dprintk("i2c_smbus_write_byte() failed, ret:%d\n", ret);
	171	return -EIO;
	172	}
	173
	174	return ret;
	175	}
176
177	static int command(struct i2c_client client, unsigned int cmd, void arg)
178	{
179	struct tea6415c_multiplex v = (struct tea6415c_multiplex )arg;
180	int result = 0;
181
182	switch (cmd) {
183	case TEA6415C_SWITCH:
184	result = switch_matrix(client, v->in, v->out);
185	break;
186	default:
187	return -ENOIOCTLCMD;
188	}
189
190	return result;
191	}
192
193	static struct i2c_driver driver = {
604f28e2	194	.driver = {
a8733ca5	195	.name = "tea6415c",
604f28e2	196	},
1da177e4	197	.id = I2C_DRIVERID_TEA6415C,
1da177e4 LT	198	.attach_adapter = attach,
	199	.detach_client = detach,
	200	.command = command,
	201	};
	202
	203	static struct i2c_client client_template = {
fae91e72	204	.name = "tea6415c",
1da177e4 LT	205	.driver = &driver,
	206	};
	207
	208	static int __init this_module_init(void)
	209	{
	210	return i2c_add_driver(&driver);
	211	}
	212
	213	static void __exit this_module_exit(void)
	214	{
	215	i2c_del_driver(&driver);
	216	}
	217
	218	module_init(this_module_init);
	219	module_exit(this_module_exit);
	220
	221	MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
	222	MODULE_DESCRIPTION("tea6415c driver");
	223	MODULE_LICENSE("GPL");