radio-terratec.c
4.37 KB
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
/* Terratec ActiveRadio ISA Standalone card driver for Linux radio support
* (c) 1999 R. Offermanns (rolf@offermanns.de)
* based on the aimslab radio driver from M. Kirkwood
* many thanks to Michael Becker and Friedhelm Birth (from TerraTec)
*
*
* History:
* 1999-05-21 First preview release
*
* Notes on the hardware:
* There are two "main" chips on the card:
* - Philips OM5610 (http://www-us.semiconductors.philips.com/acrobat/datasheets/OM5610_2.pdf)
* - Philips SAA6588 (http://www-us.semiconductors.philips.com/acrobat/datasheets/SAA6588_1.pdf)
* (you can get the datasheet at the above links)
*
* Frequency control is done digitally -- ie out(port,encodefreq(95.8));
* Volume Control is done digitally
*
* Converted to the radio-isa framework by Hans Verkuil <hans.verkuil@cisco.com>
* Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
*/
#include <linux/module.h> /* Modules */
#include <linux/init.h> /* Initdata */
#include <linux/ioport.h> /* request_region */
#include <linux/videodev2.h> /* kernel radio structs */
#include <linux/mutex.h>
#include <linux/io.h> /* outb, outb_p */
#include <linux/slab.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include "radio-isa.h"
MODULE_AUTHOR("R. Offermans & others");
MODULE_DESCRIPTION("A driver for the TerraTec ActiveRadio Standalone radio card.");
MODULE_LICENSE("GPL");
MODULE_VERSION("0.1.99");
/* Note: there seems to be only one possible port (0x590), but without
hardware this is hard to verify. For now, this is the only one we will
support. */
static int io = 0x590;
static int radio_nr = -1;
module_param(radio_nr, int, 0444);
MODULE_PARM_DESC(radio_nr, "Radio device number");
#define WRT_DIS 0x00
#define CLK_OFF 0x00
#define IIC_DATA 0x01
#define IIC_CLK 0x02
#define DATA 0x04
#define CLK_ON 0x08
#define WRT_EN 0x10
static struct radio_isa_card *terratec_alloc(void)
{
return kzalloc(sizeof(struct radio_isa_card), GFP_KERNEL);
}
static int terratec_s_mute_volume(struct radio_isa_card *isa, bool mute, int vol)
{
int i;
if (mute)
vol = 0;
vol = vol + (vol * 32); /* change both channels */
for (i = 0; i < 8; i++) {
if (vol & (0x80 >> i))
outb(0x80, isa->io + 1);
else
outb(0x00, isa->io + 1);
}
return 0;
}
/* this is the worst part in this driver */
/* many more or less strange things are going on here, but hey, it works :) */
static int terratec_s_frequency(struct radio_isa_card *isa, u32 freq)
{
int i;
int p;
int temp;
long rest;
unsigned char buffer[25]; /* we have to bit shift 25 registers */
freq = freq / 160; /* convert the freq. to a nice to handle value */
memset(buffer, 0, sizeof(buffer));
rest = freq * 10 + 10700; /* I once had understood what is going on here */
/* maybe some wise guy (friedhelm?) can comment this stuff */
i = 13;
p = 10;
temp = 102400;
while (rest != 0) {
if (rest % temp == rest)
buffer[i] = 0;
else {
buffer[i] = 1;
rest = rest - temp;
}
i--;
p--;
temp = temp / 2;
}
for (i = 24; i > -1; i--) { /* bit shift the values to the radiocard */
if (buffer[i] == 1) {
outb(WRT_EN | DATA, isa->io);
outb(WRT_EN | DATA | CLK_ON, isa->io);
outb(WRT_EN | DATA, isa->io);
} else {
outb(WRT_EN | 0x00, isa->io);
outb(WRT_EN | 0x00 | CLK_ON, isa->io);
}
}
outb(0x00, isa->io);
return 0;
}
static u32 terratec_g_signal(struct radio_isa_card *isa)
{
/* bit set = no signal present */
return (inb(isa->io) & 2) ? 0 : 0xffff;
}
static const struct radio_isa_ops terratec_ops = {
.alloc = terratec_alloc,
.s_mute_volume = terratec_s_mute_volume,
.s_frequency = terratec_s_frequency,
.g_signal = terratec_g_signal,
};
static const int terratec_ioports[] = { 0x590 };
static struct radio_isa_driver terratec_driver = {
.driver = {
.match = radio_isa_match,
.probe = radio_isa_probe,
.remove = radio_isa_remove,
.driver = {
.name = "radio-terratec",
},
},
.io_params = &io,
.radio_nr_params = &radio_nr,
.io_ports = terratec_ioports,
.num_of_io_ports = ARRAY_SIZE(terratec_ioports),
.region_size = 2,
.card = "TerraTec ActiveRadio",
.ops = &terratec_ops,
.has_stereo = true,
.max_volume = 10,
};
static int __init terratec_init(void)
{
return isa_register_driver(&terratec_driver.driver, 1);
}
static void __exit terratec_exit(void)
{
isa_unregister_driver(&terratec_driver.driver);
}
module_init(terratec_init);
module_exit(terratec_exit);