1 /* Terratec ActiveRadio ISA Standalone card driver for Linux radio support
2 * (c) 1999 R. Offermanns (rolf@offermanns.de)
3 * based on the aimslab radio driver from M. Kirkwood
4 * many thanks to Michael Becker and Friedhelm Birth (from TerraTec)
5 *
6 *
7 * History:
8 * 1999-05-21 First preview release
9 *
10 * Notes on the hardware:
11 * There are two "main" chips on the card:
12 * - Philips OM5610 (http://www-us.semiconductors.philips.com/acrobat/datasheets/OM5610_2.pdf)
13 * - Philips SAA6588 (http://www-us.semiconductors.philips.com/acrobat/datasheets/SAA6588_1.pdf)
14 * (you can get the datasheet at the above links)
15 *
16 * Frequency control is done digitally -- ie out(port,encodefreq(95.8));
17 * Volume Control is done digitally
18 *
19 * Converted to the radio-isa framework by Hans Verkuil <hans.verkuil@cisco.com>
20 * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
21 */
22
23 #include <linux/module.h> /* Modules */
24 #include <linux/init.h> /* Initdata */
25 #include <linux/ioport.h> /* request_region */
26 #include <linux/videodev2.h> /* kernel radio structs */
27 #include <linux/mutex.h>
28 #include <linux/io.h> /* outb, outb_p */
29 #include <linux/slab.h>
30 #include <media/v4l2-device.h>
31 #include <media/v4l2-ioctl.h>
32 #include "radio-isa.h"
33
34 MODULE_AUTHOR("R. Offermans & others");
35 MODULE_DESCRIPTION("A driver for the TerraTec ActiveRadio Standalone radio card.");
36 MODULE_LICENSE("GPL");
37 MODULE_VERSION("0.1.99");
38
39 /* Note: there seems to be only one possible port (0x590), but without
40 hardware this is hard to verify. For now, this is the only one we will
41 support. */
42 static int io = 0x590;
43 static int radio_nr = -1;
44
45 module_param(radio_nr, int, 0444);
46 MODULE_PARM_DESC(radio_nr, "Radio device number");
47
48 #define WRT_DIS 0x00
49 #define CLK_OFF 0x00
50 #define IIC_DATA 0x01
51 #define IIC_CLK 0x02
52 #define DATA 0x04
53 #define CLK_ON 0x08
54 #define WRT_EN 0x10
55
terratec_alloc(void)56 static struct radio_isa_card *terratec_alloc(void)
57 {
58 return kzalloc(sizeof(struct radio_isa_card), GFP_KERNEL);
59 }
60
terratec_s_mute_volume(struct radio_isa_card * isa,bool mute,int vol)61 static int terratec_s_mute_volume(struct radio_isa_card *isa, bool mute, int vol)
62 {
63 int i;
64
65 if (mute)
66 vol = 0;
67 vol = vol + (vol * 32); /* change both channels */
68 for (i = 0; i < 8; i++) {
69 if (vol & (0x80 >> i))
70 outb(0x80, isa->io + 1);
71 else
72 outb(0x00, isa->io + 1);
73 }
74 return 0;
75 }
76
77
78 /* this is the worst part in this driver */
79 /* many more or less strange things are going on here, but hey, it works :) */
80
terratec_s_frequency(struct radio_isa_card * isa,u32 freq)81 static int terratec_s_frequency(struct radio_isa_card *isa, u32 freq)
82 {
83 int i;
84 int p;
85 int temp;
86 long rest;
87 unsigned char buffer[25]; /* we have to bit shift 25 registers */
88
89 freq = freq / 160; /* convert the freq. to a nice to handle value */
90 memset(buffer, 0, sizeof(buffer));
91
92 rest = freq * 10 + 10700; /* I once had understood what is going on here */
93 /* maybe some wise guy (friedhelm?) can comment this stuff */
94 i = 13;
95 p = 10;
96 temp = 102400;
97 while (rest != 0) {
98 if (rest % temp == rest)
99 buffer[i] = 0;
100 else {
101 buffer[i] = 1;
102 rest = rest - temp;
103 }
104 i--;
105 p--;
106 temp = temp / 2;
107 }
108
109 for (i = 24; i > -1; i--) { /* bit shift the values to the radiocard */
110 if (buffer[i] == 1) {
111 outb(WRT_EN | DATA, isa->io);
112 outb(WRT_EN | DATA | CLK_ON, isa->io);
113 outb(WRT_EN | DATA, isa->io);
114 } else {
115 outb(WRT_EN | 0x00, isa->io);
116 outb(WRT_EN | 0x00 | CLK_ON, isa->io);
117 }
118 }
119 outb(0x00, isa->io);
120 return 0;
121 }
122
terratec_g_signal(struct radio_isa_card * isa)123 static u32 terratec_g_signal(struct radio_isa_card *isa)
124 {
125 /* bit set = no signal present */
126 return (inb(isa->io) & 2) ? 0 : 0xffff;
127 }
128
129 static const struct radio_isa_ops terratec_ops = {
130 .alloc = terratec_alloc,
131 .s_mute_volume = terratec_s_mute_volume,
132 .s_frequency = terratec_s_frequency,
133 .g_signal = terratec_g_signal,
134 };
135
136 static const int terratec_ioports[] = { 0x590 };
137
138 static struct radio_isa_driver terratec_driver = {
139 .driver = {
140 .match = radio_isa_match,
141 .probe = radio_isa_probe,
142 .remove = radio_isa_remove,
143 .driver = {
144 .name = "radio-terratec",
145 },
146 },
147 .io_params = &io,
148 .radio_nr_params = &radio_nr,
149 .io_ports = terratec_ioports,
150 .num_of_io_ports = ARRAY_SIZE(terratec_ioports),
151 .region_size = 2,
152 .card = "TerraTec ActiveRadio",
153 .ops = &terratec_ops,
154 .has_stereo = true,
155 .max_volume = 10,
156 };
157
terratec_init(void)158 static int __init terratec_init(void)
159 {
160 return isa_register_driver(&terratec_driver.driver, 1);
161 }
162
terratec_exit(void)163 static void __exit terratec_exit(void)
164 {
165 isa_unregister_driver(&terratec_driver.driver);
166 }
167
168 module_init(terratec_init);
169 module_exit(terratec_exit);
170
171