[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[] = {I2C_CLIENT_END};
static unsigned short normal_i2c_range[] = {0x60, 0x61, I2C_CLIENT_END};
static unsigned short probe[2]        = { I2C_CLIENT_END, I2C_CLIENT_END };
static unsigned short probe_range[2]  = { I2C_CLIENT_END, I2C_CLIENT_END };
static unsigned short ignore[2]       = { I2C_CLIENT_END, I2C_CLIENT_END };
static unsigned short ignore_range[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_range, 
	probe, probe_range, 
	ignore, ignore_range, 
	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 */
	37	static unsigned short normal_i2c[] = {I2C_CLIENT_END};
	38	static unsigned short normal_i2c_range[] = {0x60, 0x61, I2C_CLIENT_END};
	39	static unsigned short probe[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
	40	static unsigned short probe_range[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
	41	static unsigned short ignore[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
	42	static unsigned short ignore_range[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
	43	static unsigned short force[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
	44
	45	static struct i2c_client_address_data addr_data = {
	46	normal_i2c, normal_i2c_range,
	47	probe, probe_range,
	48	ignore, ignore_range,
	49	force
	50	};
	51
	52	/* ---------------------------------------------------------------------- */
	53
	54	static unsigned char
	55	tuner_getstatus (struct i2c_client *c)
	56	{
	57	unsigned char byte;
	58	if (i2c_master_recv(c, &byte, 1) != 1)
	59	printk(KERN_ERR "tuner-3036: I/O error.\n");
	60	return byte;
	61	}
	62
	63	#define TUNER_FL 0x80
	64
65	static int
66	tuner_islocked (struct i2c_client *c)
67	{
68	return (tuner_getstatus(c) & TUNER_FL);
69	}
70
71	/* ---------------------------------------------------------------------- */
72
73	static void
74	set_tv_freq(struct i2c_client *c, int freq)
75	{
76	u16 div = ((freq * 20) / 16);
77	unsigned long give_up = jiffies + HZ;
78	unsigned char buffer[2];
79
80	if (debug)
81	printk(KERN_DEBUG "tuner: setting frequency %dMHz, divisor %x\n", freq / 16, div);
82
83	/* Select high tuning current */
84	buffer[0] = 0x29;
85	buffer[1] = 0x3e;
86
87	if (i2c_master_send(c, buffer, 2) != 2)
88	printk("tuner: i2c i/o error 1\n");
89
90	buffer[0] = 0x80 \| ((div>>8) & 0x7f);
91	buffer[1] = div & 0xff;
92
93	if (i2c_master_send(c, buffer, 2) != 2)
94	printk("tuner: i2c i/o error 2\n");
95
96	while (!tuner_islocked(c) && time_before(jiffies, give_up))
97	schedule();
98
99	if (!tuner_islocked(c))
100	printk(KERN_WARNING "tuner: failed to achieve PLL lock\n");
101
102	/* Select low tuning current and engage AFC */
103	buffer[0] = 0x29;
104	buffer[1] = 0xb2;
105
106	if (i2c_master_send(c, buffer, 2) != 2)
107	printk("tuner: i2c i/o error 3\n");
108
109	if (debug)
110	printk(KERN_DEBUG "tuner: status %02x\n", tuner_getstatus(c));
111	}
112
113	/* ---------------------------------------------------------------------- */
114
115	static int
116	tuner_attach(struct i2c_adapter *adap, int addr, int kind)
117	{
118	static unsigned char buffer[] = { 0x29, 0x32, 0x2a, 0, 0x2b, 0 };
119
120	struct i2c_client *client;
121
122	if (this_adap > 0)
123	return -1;
124	this_adap++;
125
126	client_template.adapter = adap;
127	client_template.addr = addr;
128
129	client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
130	if (client == NULL)
131	return -ENOMEM;
132	memcpy(client, &client_template, sizeof(struct i2c_client));
133
134	printk("tuner: SAB3036 found, status %02x\n", tuner_getstatus(client));
135
136	i2c_attach_client(client);
137
138	if (i2c_master_send(client, buffer, 2) != 2)
139	printk("tuner: i2c i/o error 1\n");
140	if (i2c_master_send(client, buffer+2, 2) != 2)
141	printk("tuner: i2c i/o error 2\n");
142	if (i2c_master_send(client, buffer+4, 2) != 2)
143	printk("tuner: i2c i/o error 3\n");
144	return 0;
145	}
146
147	static int
148	tuner_detach(struct i2c_client *c)
149	{
150	return 0;
151	}
152
153	static int
154	tuner_command(struct i2c_client client, unsigned int cmd, void arg)
155	{
156	int iarg = (int)arg;
157
158	switch (cmd)
159	{
160	case TUNER_SET_TVFREQ:
161	set_tv_freq(client, *iarg);
162	break;
163
164	default:
165	return -EINVAL;
166	}
167	return 0;
168	}
169
170	static int
171	tuner_probe(struct i2c_adapter *adap)
172	{
173	this_adap = 0;
174	if (adap->id == (I2C_ALGO_BIT \| I2C_HW_B_LP))
175	return i2c_probe(adap, &addr_data, tuner_attach);
176	return 0;
177	}
178
179	/* ----------------------------------------------------------------------- */
180
181	static struct i2c_driver
182	i2c_driver_tuner =
183	{
184	.owner = THIS_MODULE,
185	.name = "sab3036",
186	.id = I2C_DRIVERID_SAB3036,
187	.flags = I2C_DF_NOTIFY,
188	.attach_adapter = tuner_probe,
189	.detach_client = tuner_detach,
190	.command = tuner_command
191	};
192
193	static struct i2c_client client_template =
194	{
195	.driver = &i2c_driver_tuner,
196	.name = "SAB3036",
197	};
198
199	static int __init
200	tuner3036_init(void)
201	{
202	i2c_add_driver(&i2c_driver_tuner);
203	return 0;
204	}
205
206	static void __exit
207	tuner3036_exit(void)
208	{
209	i2c_del_driver(&i2c_driver_tuner);
210	}
211
212	MODULE_DESCRIPTION("SAB3036 tuner driver");
213	MODULE_AUTHOR("Philip Blundell <philb@gnu.org>");
214	MODULE_LICENSE("GPL");
215
216	module_param(debug, int, 0);
217	MODULE_PARM_DESC(debug,"Enable debugging output");
218
219	module_init(tuner3036_init);
220	module_exit(tuner3036_exit);