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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/media/radio/radio-aztech.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/media/radio/radio-aztech.c')
-rw-r--r--drivers/media/radio/radio-aztech.c315
1 files changed, 315 insertions, 0 deletions
diff --git a/drivers/media/radio/radio-aztech.c b/drivers/media/radio/radio-aztech.c
new file mode 100644
index 000000000000..013c835ed910
--- /dev/null
+++ b/drivers/media/radio/radio-aztech.c
@@ -0,0 +1,315 @@
1/* radio-aztech.c - Aztech radio card driver for Linux 2.2
2 *
3 * Adapted to support the Video for Linux API by
4 * Russell Kroll <rkroll@exploits.org>. Based on original tuner code by:
5 *
6 * Quay Ly
7 * Donald Song
8 * Jason Lewis (jlewis@twilight.vtc.vsc.edu)
9 * Scott McGrath (smcgrath@twilight.vtc.vsc.edu)
10 * William McGrath (wmcgrath@twilight.vtc.vsc.edu)
11 *
12 * The basis for this code may be found at http://bigbang.vtc.vsc.edu/fmradio/
13 * along with more information on the card itself.
14 *
15 * History:
16 * 1999-02-24 Russell Kroll <rkroll@exploits.org>
17 * Fine tuning/VIDEO_TUNER_LOW
18 * Range expanded to 87-108 MHz (from 87.9-107.8)
19 *
20 * Notable changes from the original source:
21 * - includes stripped down to the essentials
22 * - for loops used as delays replaced with udelay()
23 * - #defines removed, changed to static values
24 * - tuning structure changed - no more character arrays, other changes
25*/
26
27#include <linux/module.h> /* Modules */
28#include <linux/init.h> /* Initdata */
29#include <linux/ioport.h> /* check_region, request_region */
30#include <linux/delay.h> /* udelay */
31#include <asm/io.h> /* outb, outb_p */
32#include <asm/uaccess.h> /* copy to/from user */
33#include <linux/videodev.h> /* kernel radio structs */
34#include <linux/config.h> /* CONFIG_RADIO_AZTECH_PORT */
35
36/* acceptable ports: 0x350 (JP3 shorted), 0x358 (JP3 open) */
37
38#ifndef CONFIG_RADIO_AZTECH_PORT
39#define CONFIG_RADIO_AZTECH_PORT -1
40#endif
41
42static int io = CONFIG_RADIO_AZTECH_PORT;
43static int radio_nr = -1;
44static int radio_wait_time = 1000;
45static struct semaphore lock;
46
47struct az_device
48{
49 int curvol;
50 unsigned long curfreq;
51 int stereo;
52};
53
54static int volconvert(int level)
55{
56 level>>=14; /* Map 16bits down to 2 bit */
57 level&=3;
58
59 /* convert to card-friendly values */
60 switch (level)
61 {
62 case 0:
63 return 0;
64 case 1:
65 return 1;
66 case 2:
67 return 4;
68 case 3:
69 return 5;
70 }
71 return 0; /* Quieten gcc */
72}
73
74static void send_0_byte (struct az_device *dev)
75{
76 udelay(radio_wait_time);
77 outb_p(2+volconvert(dev->curvol), io);
78 outb_p(64+2+volconvert(dev->curvol), io);
79}
80
81static void send_1_byte (struct az_device *dev)
82{
83 udelay (radio_wait_time);
84 outb_p(128+2+volconvert(dev->curvol), io);
85 outb_p(128+64+2+volconvert(dev->curvol), io);
86}
87
88static int az_setvol(struct az_device *dev, int vol)
89{
90 down(&lock);
91 outb (volconvert(vol), io);
92 up(&lock);
93 return 0;
94}
95
96/* thanks to Michael Dwyer for giving me a dose of clues in
97 * the signal strength department..
98 *
99 * This card has a stereo bit - bit 0 set = mono, not set = stereo
100 * It also has a "signal" bit - bit 1 set = bad signal, not set = good
101 *
102 */
103
104static int az_getsigstr(struct az_device *dev)
105{
106 if (inb(io) & 2) /* bit set = no signal present */
107 return 0;
108 return 1; /* signal present */
109}
110
111static int az_getstereo(struct az_device *dev)
112{
113 if (inb(io) & 1) /* bit set = mono */
114 return 0;
115 return 1; /* stereo */
116}
117
118static int az_setfreq(struct az_device *dev, unsigned long frequency)
119{
120 int i;
121
122 frequency += 171200; /* Add 10.7 MHz IF */
123 frequency /= 800; /* Convert to 50 kHz units */
124
125 down(&lock);
126
127 send_0_byte (dev); /* 0: LSB of frequency */
128
129 for (i = 0; i < 13; i++) /* : frequency bits (1-13) */
130 if (frequency & (1 << i))
131 send_1_byte (dev);
132 else
133 send_0_byte (dev);
134
135 send_0_byte (dev); /* 14: test bit - always 0 */
136 send_0_byte (dev); /* 15: test bit - always 0 */
137 send_0_byte (dev); /* 16: band data 0 - always 0 */
138 if (dev->stereo) /* 17: stereo (1 to enable) */
139 send_1_byte (dev);
140 else
141 send_0_byte (dev);
142
143 send_1_byte (dev); /* 18: band data 1 - unknown */
144 send_0_byte (dev); /* 19: time base - always 0 */
145 send_0_byte (dev); /* 20: spacing (0 = 25 kHz) */
146 send_1_byte (dev); /* 21: spacing (1 = 25 kHz) */
147 send_0_byte (dev); /* 22: spacing (0 = 25 kHz) */
148 send_1_byte (dev); /* 23: AM/FM (FM = 1, always) */
149
150 /* latch frequency */
151
152 udelay (radio_wait_time);
153 outb_p(128+64+volconvert(dev->curvol), io);
154
155 up(&lock);
156
157 return 0;
158}
159
160static int az_do_ioctl(struct inode *inode, struct file *file,
161 unsigned int cmd, void *arg)
162{
163 struct video_device *dev = video_devdata(file);
164 struct az_device *az = dev->priv;
165
166 switch(cmd)
167 {
168 case VIDIOCGCAP:
169 {
170 struct video_capability *v = arg;
171 memset(v,0,sizeof(*v));
172 v->type=VID_TYPE_TUNER;
173 v->channels=1;
174 v->audios=1;
175 strcpy(v->name, "Aztech Radio");
176 return 0;
177 }
178 case VIDIOCGTUNER:
179 {
180 struct video_tuner *v = arg;
181 if(v->tuner) /* Only 1 tuner */
182 return -EINVAL;
183 v->rangelow=(87*16000);
184 v->rangehigh=(108*16000);
185 v->flags=VIDEO_TUNER_LOW;
186 v->mode=VIDEO_MODE_AUTO;
187 v->signal=0xFFFF*az_getsigstr(az);
188 if(az_getstereo(az))
189 v->flags|=VIDEO_TUNER_STEREO_ON;
190 strcpy(v->name, "FM");
191 return 0;
192 }
193 case VIDIOCSTUNER:
194 {
195 struct video_tuner *v = arg;
196 if(v->tuner!=0)
197 return -EINVAL;
198 return 0;
199 }
200 case VIDIOCGFREQ:
201 {
202 unsigned long *freq = arg;
203 *freq = az->curfreq;
204 return 0;
205 }
206 case VIDIOCSFREQ:
207 {
208 unsigned long *freq = arg;
209 az->curfreq = *freq;
210 az_setfreq(az, az->curfreq);
211 return 0;
212 }
213 case VIDIOCGAUDIO:
214 {
215 struct video_audio *v = arg;
216 memset(v,0, sizeof(*v));
217 v->flags|=VIDEO_AUDIO_MUTABLE|VIDEO_AUDIO_VOLUME;
218 if(az->stereo)
219 v->mode=VIDEO_SOUND_STEREO;
220 else
221 v->mode=VIDEO_SOUND_MONO;
222 v->volume=az->curvol;
223 v->step=16384;
224 strcpy(v->name, "Radio");
225 return 0;
226 }
227 case VIDIOCSAUDIO:
228 {
229 struct video_audio *v = arg;
230 if(v->audio)
231 return -EINVAL;
232 az->curvol=v->volume;
233
234 az->stereo=(v->mode&VIDEO_SOUND_STEREO)?1:0;
235 if(v->flags&VIDEO_AUDIO_MUTE)
236 az_setvol(az,0);
237 else
238 az_setvol(az,az->curvol);
239 return 0;
240 }
241 default:
242 return -ENOIOCTLCMD;
243 }
244}
245
246static int az_ioctl(struct inode *inode, struct file *file,
247 unsigned int cmd, unsigned long arg)
248{
249 return video_usercopy(inode, file, cmd, arg, az_do_ioctl);
250}
251
252static struct az_device aztech_unit;
253
254static struct file_operations aztech_fops = {
255 .owner = THIS_MODULE,
256 .open = video_exclusive_open,
257 .release = video_exclusive_release,
258 .ioctl = az_ioctl,
259 .llseek = no_llseek,
260};
261
262static struct video_device aztech_radio=
263{
264 .owner = THIS_MODULE,
265 .name = "Aztech radio",
266 .type = VID_TYPE_TUNER,
267 .hardware = VID_HARDWARE_AZTECH,
268 .fops = &aztech_fops,
269};
270
271static int __init aztech_init(void)
272{
273 if(io==-1)
274 {
275 printk(KERN_ERR "You must set an I/O address with io=0x???\n");
276 return -EINVAL;
277 }
278
279 if (!request_region(io, 2, "aztech"))
280 {
281 printk(KERN_ERR "aztech: port 0x%x already in use\n", io);
282 return -EBUSY;
283 }
284
285 init_MUTEX(&lock);
286 aztech_radio.priv=&aztech_unit;
287
288 if(video_register_device(&aztech_radio, VFL_TYPE_RADIO, radio_nr)==-1)
289 {
290 release_region(io,2);
291 return -EINVAL;
292 }
293
294 printk(KERN_INFO "Aztech radio card driver v1.00/19990224 rkroll@exploits.org\n");
295 /* mute card - prevents noisy bootups */
296 outb (0, io);
297 return 0;
298}
299
300MODULE_AUTHOR("Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
301MODULE_DESCRIPTION("A driver for the Aztech radio card.");
302MODULE_LICENSE("GPL");
303
304module_param(io, int, 0);
305module_param(radio_nr, int, 0);
306MODULE_PARM_DESC(io, "I/O address of the Aztech card (0x350 or 0x358)");
307
308static void __exit aztech_cleanup(void)
309{
310 video_unregister_device(&aztech_radio);
311 release_region(io,2);
312}
313
314module_init(aztech_init);
315module_exit(aztech_cleanup);