[deliverable/linux.git] / drivers / media / video / tuner-3036.c

/*
 * Driver for Philips SAB3036 "CITAC" tuner control chip.
 *
 * Author: Phil Blundell <philb@gnu.org>
 *
 * The SAB3036 is just about different enough from the chips that
 * tuner.c copes with to make it not worth the effort to crowbar
 * the support into that file.  So instead we have a separate driver. 
 *
 * 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.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/init.h>

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

#include <media/tuner.h>

static int debug;	/* insmod parameter */
static int this_adap;

static struct i2c_client client_template;

/* Addresses to scan */
static unsigned short normal_i2c[] = { 0x60, 0x61, I2C_CLIENT_END };
static unsigned short ignore = I2C_CLIENT_END;

static struct i2c_client_address_data addr_data = {
	.normal_i2c	= normal_i2c,
	.probe		= &ignore,
	.ignore		= &ignore,
};

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

static unsigned char
tuner_getstatus (struct i2c_client *c)
{
	unsigned char byte;
	if (i2c_master_recv(c, &byte, 1) != 1)
		printk(KERN_ERR "tuner-3036: I/O error.\n");
	return byte;
}

#define TUNER_FL        0x80

static int 
tuner_islocked (struct i2c_client *c)
{
        return (tuner_getstatus(c) & TUNER_FL);
}

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

static void 
set_tv_freq(struct i2c_client *c, int freq)
{
	u16 div = ((freq * 20) / 16);
	unsigned long give_up = jiffies + HZ;
	unsigned char buffer[2];

	if (debug)
		printk(KERN_DEBUG "tuner: setting frequency %dMHz, divisor %x\n", freq / 16, div);
	
	/* Select high tuning current */
	buffer[0] = 0x29;
	buffer[1] = 0x3e;

	if (i2c_master_send(c, buffer, 2) != 2)
		printk("tuner: i2c i/o error 1\n");
	
	buffer[0] = 0x80 | ((div>>8) & 0x7f);
	buffer[1] = div & 0xff;

	if (i2c_master_send(c, buffer, 2) != 2)
		printk("tuner: i2c i/o error 2\n");
	
	while (!tuner_islocked(c) && time_before(jiffies, give_up))
		schedule();
	       
	if (!tuner_islocked(c))
		printk(KERN_WARNING "tuner: failed to achieve PLL lock\n");
	
	/* Select low tuning current and engage AFC */
	buffer[0] = 0x29;
	buffer[1] = 0xb2;

	if (i2c_master_send(c, buffer, 2) != 2)
		printk("tuner: i2c i/o error 3\n");

	if (debug)
		printk(KERN_DEBUG "tuner: status %02x\n", tuner_getstatus(c));
}

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

static int 
tuner_attach(struct i2c_adapter *adap, int addr, int kind)
{
	static unsigned char buffer[] = { 0x29, 0x32, 0x2a, 0, 0x2b, 0 };

	struct i2c_client *client;

	if (this_adap > 0)
		return -1;
	this_adap++;
	
        client_template.adapter = adap;
        client_template.addr = addr;

	client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
        if (client == NULL)
                return -ENOMEM;
        memcpy(client, &client_template, sizeof(struct i2c_client));

	printk("tuner: SAB3036 found, status %02x\n", tuner_getstatus(client));

        i2c_attach_client(client);

	if (i2c_master_send(client, buffer, 2) != 2)
		printk("tuner: i2c i/o error 1\n");
	if (i2c_master_send(client, buffer+2, 2) != 2)
		printk("tuner: i2c i/o error 2\n");
	if (i2c_master_send(client, buffer+4, 2) != 2)
		printk("tuner: i2c i/o error 3\n");
	return 0;
}

static int 
tuner_detach(struct i2c_client *c)
{
	return 0;
}

static int 
tuner_command(struct i2c_client *client, unsigned int cmd, void *arg)
{
	int *iarg = (int*)arg;

	switch (cmd) 
	{
		case VIDIOCSFREQ:
			set_tv_freq(client, *iarg);
			break;
	    
		default:
			return -EINVAL;
	}
	return 0;
}

static int 
tuner_probe(struct i2c_adapter *adap)
{
	this_adap = 0;
	if (adap->id == I2C_HW_B_LP)
		return i2c_probe(adap, &addr_data, tuner_attach);
	return 0;
}

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

static struct i2c_driver 
i2c_driver_tuner = 
{
	.driver = {
		.owner	=	THIS_MODULE,
		.name	=	"sab3036",
	},
	.id		=	I2C_DRIVERID_SAB3036,
	.attach_adapter =	tuner_probe,
	.detach_client  =	tuner_detach,
	.command	=	tuner_command
};

static struct i2c_client client_template =
{
        .driver		= &i2c_driver_tuner,
	.name		= "SAB3036",
};

static int __init
tuner3036_init(void)
{
	i2c_add_driver(&i2c_driver_tuner);
	return 0;
}

static void __exit
tuner3036_exit(void)
{
	i2c_del_driver(&i2c_driver_tuner);
}

MODULE_DESCRIPTION("SAB3036 tuner driver");
MODULE_AUTHOR("Philip Blundell <philb@gnu.org>");
MODULE_LICENSE("GPL");

module_param(debug, int, 0);
MODULE_PARM_DESC(debug,"Enable debugging output");

module_init(tuner3036_init);
module_exit(tuner3036_exit);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Driver for Philips SAB3036 "CITAC" tuner control chip.
	3	*
	4	* Author: Phil Blundell <philb@gnu.org>
	5	*
	6	* The SAB3036 is just about different enough from the chips that
	7	* tuner.c copes with to make it not worth the effort to crowbar
	8	* the support into that file. So instead we have a separate driver.
	9	*
	10	* This program is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU General Public License
	12	* as published by the Free Software Foundation; either version
	13	* 2 of the License, or (at your option) any later version.
	14	*/
	15
	16	#include <linux/module.h>
	17	#include <linux/kernel.h>
	18	#include <linux/sched.h>
	19	#include <linux/string.h>
	20	#include <linux/timer.h>
	21	#include <linux/delay.h>
	22	#include <linux/errno.h>
	23	#include <linux/slab.h>
	24	#include <linux/init.h>
	25
	26	#include <linux/i2c.h>
	27	#include <linux/videodev.h>
	28
	29	#include <media/tuner.h>
	30
	31	static int debug; /* insmod parameter */
	32	static int this_adap;
	33
	34	static struct i2c_client client_template;
	35
	36	/* Addresses to scan */
b3d5496e	37	static unsigned short normal_i2c[] = { 0x60, 0x61, I2C_CLIENT_END };
68cc9d0b	38	static unsigned short ignore = I2C_CLIENT_END;
1da177e4 LT	39
1da177e4 LT	40	static struct i2c_client_address_data addr_data = {
b3d5496e	41	.normal_i2c = normal_i2c,
68cc9d0b JD	42	.probe = &ignore,
68cc9d0b JD	43	.ignore = &ignore,
1da177e4 LT	44	};
	45
	46	/* ---------------------------------------------------------------------- */
	47
	48	static unsigned char
	49	tuner_getstatus (struct i2c_client *c)
	50	{
	51	unsigned char byte;
	52	if (i2c_master_recv(c, &byte, 1) != 1)
	53	printk(KERN_ERR "tuner-3036: I/O error.\n");
	54	return byte;
	55	}
	56
	57	#define TUNER_FL 0x80
	58
	59	static int
	60	tuner_islocked (struct i2c_client *c)
	61	{
	62	return (tuner_getstatus(c) & TUNER_FL);
	63	}
	64
	65	/* ---------------------------------------------------------------------- */
	66
	67	static void
	68	set_tv_freq(struct i2c_client *c, int freq)
	69	{
	70	u16 div = ((freq * 20) / 16);
	71	unsigned long give_up = jiffies + HZ;
	72	unsigned char buffer[2];
	73
	74	if (debug)
	75	printk(KERN_DEBUG "tuner: setting frequency %dMHz, divisor %x\n", freq / 16, div);
	76
	77	/* Select high tuning current */
	78	buffer[0] = 0x29;
	79	buffer[1] = 0x3e;
	80
	81	if (i2c_master_send(c, buffer, 2) != 2)
	82	printk("tuner: i2c i/o error 1\n");
	83
	84	buffer[0] = 0x80 \| ((div>>8) & 0x7f);
	85	buffer[1] = div & 0xff;
	86
	87	if (i2c_master_send(c, buffer, 2) != 2)
	88	printk("tuner: i2c i/o error 2\n");
	89
	90	while (!tuner_islocked(c) && time_before(jiffies, give_up))
	91	schedule();
	92
	93	if (!tuner_islocked(c))
	94	printk(KERN_WARNING "tuner: failed to achieve PLL lock\n");
	95
	96	/* Select low tuning current and engage AFC */
	97	buffer[0] = 0x29;
	98	buffer[1] = 0xb2;
	99
	100	if (i2c_master_send(c, buffer, 2) != 2)
	101	printk("tuner: i2c i/o error 3\n");
	102
	103	if (debug)
	104	printk(KERN_DEBUG "tuner: status %02x\n", tuner_getstatus(c));
	105	}
	106
	107	/* ---------------------------------------------------------------------- */
108
109	static int
110	tuner_attach(struct i2c_adapter *adap, int addr, int kind)
111	{
112	static unsigned char buffer[] = { 0x29, 0x32, 0x2a, 0, 0x2b, 0 };
113
114	struct i2c_client *client;
115
116	if (this_adap > 0)
117	return -1;
118	this_adap++;
119
120	client_template.adapter = adap;
121	client_template.addr = addr;
122
123	client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
124	if (client == NULL)
125	return -ENOMEM;
126	memcpy(client, &client_template, sizeof(struct i2c_client));
127
128	printk("tuner: SAB3036 found, status %02x\n", tuner_getstatus(client));
129
130	i2c_attach_client(client);
131
132	if (i2c_master_send(client, buffer, 2) != 2)
133	printk("tuner: i2c i/o error 1\n");
134	if (i2c_master_send(client, buffer+2, 2) != 2)
135	printk("tuner: i2c i/o error 2\n");
136	if (i2c_master_send(client, buffer+4, 2) != 2)
137	printk("tuner: i2c i/o error 3\n");
138	return 0;
139	}
140
141	static int
142	tuner_detach(struct i2c_client *c)
143	{
144	return 0;
145	}
146
147	static int
148	tuner_command(struct i2c_client client, unsigned int cmd, void arg)
149	{
150	int iarg = (int)arg;
151
152	switch (cmd)
153	{
af9eeed2	154	case VIDIOCSFREQ:
1da177e4 LT	155	set_tv_freq(client, *iarg);
	156	break;
	157
	158	default:
	159	return -EINVAL;
	160	}
	161	return 0;
	162	}
	163
	164	static int
	165	tuner_probe(struct i2c_adapter *adap)
	166	{
	167	this_adap = 0;
c7a46533	168	if (adap->id == I2C_HW_B_LP)
1da177e4 LT	169	return i2c_probe(adap, &addr_data, tuner_attach);
	170	return 0;
	171	}
	172
	173	/* ----------------------------------------------------------------------- */
	174
	175	static struct i2c_driver
	176	i2c_driver_tuner =
	177	{
604f28e2 LR	178	.driver = {
	179	.owner = THIS_MODULE,
	180	.name = "sab3036",
	181	},
1da177e4	182	.id = I2C_DRIVERID_SAB3036,
1da177e4 LT	183	.attach_adapter = tuner_probe,
	184	.detach_client = tuner_detach,
	185	.command = tuner_command
	186	};
	187
	188	static struct i2c_client client_template =
	189	{
	190	.driver = &i2c_driver_tuner,
	191	.name = "SAB3036",
	192	};
	193
	194	static int __init
	195	tuner3036_init(void)
	196	{
	197	i2c_add_driver(&i2c_driver_tuner);
	198	return 0;
	199	}
	200
	201	static void __exit
	202	tuner3036_exit(void)
	203	{
	204	i2c_del_driver(&i2c_driver_tuner);
	205	}
	206
	207	MODULE_DESCRIPTION("SAB3036 tuner driver");
	208	MODULE_AUTHOR("Philip Blundell <philb@gnu.org>");
	209	MODULE_LICENSE("GPL");
	210
	211	module_param(debug, int, 0);
	212	MODULE_PARM_DESC(debug,"Enable debugging output");
	213
	214	module_init(tuner3036_init);
	215	module_exit(tuner3036_exit);