1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
/*
* 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 = {
.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)
{
return i2c_add_driver(&i2c_driver_tuner);
}
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);
|
