[linux-block.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 probe[2]        = { I2C_CLIENT_END, I2C_CLIENT_END };
static unsigned short ignore[2]       = { I2C_CLIENT_END, I2C_CLIENT_END };
static unsigned short force[2]        = { I2C_CLIENT_END, I2C_CLIENT_END };

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

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

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 TUNER_SET_TVFREQ:
			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_ALGO_BIT | I2C_HW_B_LP))
		return i2c_probe(adap, &addr_data, tuner_attach);
	return 0;
}

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

static struct i2c_driver 
i2c_driver_tuner = 
{
	.owner		=	THIS_MODULE,
	.name		=	"sab3036",
	.id		=	I2C_DRIVERID_SAB3036,
        .flags		=	I2C_DF_NOTIFY,
	.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 };
1da177e4	38	static unsigned short probe[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
1da177e4	39	static unsigned short ignore[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
1da177e4 LT	40	static unsigned short force[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
	41
	42	static struct i2c_client_address_data addr_data = {
b3d5496e JD	43	.normal_i2c = normal_i2c,
	44	.probe = probe,
	45	.ignore = ignore,
	46	.force = force,
1da177e4 LT	47	};
	48
	49	/* ---------------------------------------------------------------------- */
	50
	51	static unsigned char
	52	tuner_getstatus (struct i2c_client *c)
	53	{
	54	unsigned char byte;
	55	if (i2c_master_recv(c, &byte, 1) != 1)
	56	printk(KERN_ERR "tuner-3036: I/O error.\n");
	57	return byte;
	58	}
	59
	60	#define TUNER_FL 0x80
	61
	62	static int
	63	tuner_islocked (struct i2c_client *c)
	64	{
	65	return (tuner_getstatus(c) & TUNER_FL);
	66	}
	67
	68	/* ---------------------------------------------------------------------- */
	69
	70	static void
	71	set_tv_freq(struct i2c_client *c, int freq)
	72	{
	73	u16 div = ((freq * 20) / 16);
	74	unsigned long give_up = jiffies + HZ;
	75	unsigned char buffer[2];
	76
	77	if (debug)
	78	printk(KERN_DEBUG "tuner: setting frequency %dMHz, divisor %x\n", freq / 16, div);
	79
	80	/* Select high tuning current */
	81	buffer[0] = 0x29;
	82	buffer[1] = 0x3e;
	83
	84	if (i2c_master_send(c, buffer, 2) != 2)
	85	printk("tuner: i2c i/o error 1\n");
	86
	87	buffer[0] = 0x80 \| ((div>>8) & 0x7f);
	88	buffer[1] = div & 0xff;
	89
	90	if (i2c_master_send(c, buffer, 2) != 2)
	91	printk("tuner: i2c i/o error 2\n");
	92
	93	while (!tuner_islocked(c) && time_before(jiffies, give_up))
	94	schedule();
	95
	96	if (!tuner_islocked(c))
	97	printk(KERN_WARNING "tuner: failed to achieve PLL lock\n");
	98
	99	/* Select low tuning current and engage AFC */
	100	buffer[0] = 0x29;
	101	buffer[1] = 0xb2;
	102
	103	if (i2c_master_send(c, buffer, 2) != 2)
	104	printk("tuner: i2c i/o error 3\n");
	105
	106	if (debug)
	107	printk(KERN_DEBUG "tuner: status %02x\n", tuner_getstatus(c));
	108	}
	109
	110	/* ---------------------------------------------------------------------- */
111
112	static int
113	tuner_attach(struct i2c_adapter *adap, int addr, int kind)
114	{
115	static unsigned char buffer[] = { 0x29, 0x32, 0x2a, 0, 0x2b, 0 };
116
117	struct i2c_client *client;
118
119	if (this_adap > 0)
120	return -1;
121	this_adap++;
122
123	client_template.adapter = adap;
124	client_template.addr = addr;
125
126	client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
127	if (client == NULL)
128	return -ENOMEM;
129	memcpy(client, &client_template, sizeof(struct i2c_client));
130
131	printk("tuner: SAB3036 found, status %02x\n", tuner_getstatus(client));
132
133	i2c_attach_client(client);
134
135	if (i2c_master_send(client, buffer, 2) != 2)
136	printk("tuner: i2c i/o error 1\n");
137	if (i2c_master_send(client, buffer+2, 2) != 2)
138	printk("tuner: i2c i/o error 2\n");
139	if (i2c_master_send(client, buffer+4, 2) != 2)
140	printk("tuner: i2c i/o error 3\n");
141	return 0;
142	}
143
144	static int
145	tuner_detach(struct i2c_client *c)
146	{
147	return 0;
148	}
149
150	static int
151	tuner_command(struct i2c_client client, unsigned int cmd, void arg)
152	{
153	int iarg = (int)arg;
154
155	switch (cmd)
156	{
157	case TUNER_SET_TVFREQ:
158	set_tv_freq(client, *iarg);
159	break;
160
161	default:
162	return -EINVAL;
163	}
164	return 0;
165	}
166
167	static int
168	tuner_probe(struct i2c_adapter *adap)
169	{
170	this_adap = 0;
171	if (adap->id == (I2C_ALGO_BIT \| I2C_HW_B_LP))
172	return i2c_probe(adap, &addr_data, tuner_attach);
173	return 0;
174	}
175
176	/* ----------------------------------------------------------------------- */
177
178	static struct i2c_driver
179	i2c_driver_tuner =
180	{
181	.owner = THIS_MODULE,
182	.name = "sab3036",
183	.id = I2C_DRIVERID_SAB3036,
184	.flags = I2C_DF_NOTIFY,
185	.attach_adapter = tuner_probe,
186	.detach_client = tuner_detach,
187	.command = tuner_command
188	};
189
190	static struct i2c_client client_template =
191	{
192	.driver = &i2c_driver_tuner,
193	.name = "SAB3036",
194	};
195
196	static int __init
197	tuner3036_init(void)
198	{
199	i2c_add_driver(&i2c_driver_tuner);
200	return 0;
201	}
202
203	static void __exit
204	tuner3036_exit(void)
205	{
206	i2c_del_driver(&i2c_driver_tuner);
207	}
208
209	MODULE_DESCRIPTION("SAB3036 tuner driver");
210	MODULE_AUTHOR("Philip Blundell <philb@gnu.org>");
211	MODULE_LICENSE("GPL");
212
213	module_param(debug, int, 0);
214	MODULE_PARM_DESC(debug,"Enable debugging output");
215
216	module_init(tuner3036_init);
217	module_exit(tuner3036_exit);