Commit | Line | Data |
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1da177e4 LT |
1 | /* GemTek radio card driver for Linux (C) 1998 Jonas Munsin <jmunsin@iki.fi> |
2 | * | |
3 | * GemTek hasn't released any specs on the card, so the protocol had to | |
4 | * be reverse engineered with dosemu. | |
5 | * | |
6 | * Besides the protocol changes, this is mostly a copy of: | |
7 | * | |
8 | * RadioTrack II driver for Linux radio support (C) 1998 Ben Pfaff | |
9 | * | |
10 | * Based on RadioTrack I/RadioReveal (C) 1997 M. Kirkwood | |
11 | * Converted to new API by Alan Cox <Alan.Cox@linux.org> | |
12 | * Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org> | |
13 | * | |
14 | * TODO: Allow for more than one of these foolish entities :-) | |
15 | * | |
16 | */ | |
17 | ||
18 | #include <linux/module.h> /* Modules */ | |
19 | #include <linux/init.h> /* Initdata */ | |
20 | #include <linux/ioport.h> /* check_region, request_region */ | |
21 | #include <linux/delay.h> /* udelay */ | |
22 | #include <asm/io.h> /* outb, outb_p */ | |
23 | #include <asm/uaccess.h> /* copy to/from user */ | |
24 | #include <linux/videodev.h> /* kernel radio structs */ | |
25 | #include <linux/config.h> /* CONFIG_RADIO_GEMTEK_PORT */ | |
26 | #include <linux/spinlock.h> | |
27 | ||
28 | #ifndef CONFIG_RADIO_GEMTEK_PORT | |
29 | #define CONFIG_RADIO_GEMTEK_PORT -1 | |
30 | #endif | |
31 | ||
32 | static int io = CONFIG_RADIO_GEMTEK_PORT; | |
33 | static int radio_nr = -1; | |
34 | static spinlock_t lock; | |
35 | ||
36 | struct gemtek_device | |
37 | { | |
38 | int port; | |
39 | unsigned long curfreq; | |
40 | int muted; | |
41 | }; | |
42 | ||
43 | ||
44 | /* local things */ | |
45 | ||
46 | /* the correct way to mute the gemtek may be to write the last written | |
47 | * frequency || 0x10, but just writing 0x10 once seems to do it as well | |
48 | */ | |
49 | static void gemtek_mute(struct gemtek_device *dev) | |
50 | { | |
51 | if(dev->muted) | |
52 | return; | |
53 | spin_lock(&lock); | |
54 | outb(0x10, io); | |
55 | spin_unlock(&lock); | |
56 | dev->muted = 1; | |
57 | } | |
58 | ||
59 | static void gemtek_unmute(struct gemtek_device *dev) | |
60 | { | |
61 | if(dev->muted == 0) | |
62 | return; | |
63 | spin_lock(&lock); | |
64 | outb(0x20, io); | |
65 | spin_unlock(&lock); | |
66 | dev->muted = 0; | |
67 | } | |
68 | ||
69 | static void zero(void) | |
70 | { | |
71 | outb_p(0x04, io); | |
72 | udelay(5); | |
73 | outb_p(0x05, io); | |
74 | udelay(5); | |
75 | } | |
76 | ||
77 | static void one(void) | |
78 | { | |
79 | outb_p(0x06, io); | |
80 | udelay(5); | |
81 | outb_p(0x07, io); | |
82 | udelay(5); | |
83 | } | |
84 | ||
85 | static int gemtek_setfreq(struct gemtek_device *dev, unsigned long freq) | |
86 | { | |
87 | int i; | |
88 | ||
89 | /* freq = 78.25*((float)freq/16000.0 + 10.52); */ | |
90 | ||
91 | freq /= 16; | |
92 | freq += 10520; | |
93 | freq *= 7825; | |
94 | freq /= 100000; | |
95 | ||
96 | spin_lock(&lock); | |
97 | ||
98 | /* 2 start bits */ | |
99 | outb_p(0x03, io); | |
100 | udelay(5); | |
101 | outb_p(0x07, io); | |
102 | udelay(5); | |
103 | ||
104 | /* 28 frequency bits (lsb first) */ | |
105 | for (i = 0; i < 14; i++) | |
106 | if (freq & (1 << i)) | |
107 | one(); | |
108 | else | |
109 | zero(); | |
110 | /* 36 unknown bits */ | |
111 | for (i = 0; i < 11; i++) | |
112 | zero(); | |
113 | one(); | |
114 | for (i = 0; i < 4; i++) | |
115 | zero(); | |
116 | one(); | |
117 | zero(); | |
118 | ||
119 | /* 2 end bits */ | |
120 | outb_p(0x03, io); | |
121 | udelay(5); | |
122 | outb_p(0x07, io); | |
123 | udelay(5); | |
124 | ||
125 | spin_unlock(&lock); | |
126 | ||
127 | return 0; | |
128 | } | |
129 | ||
130 | static int gemtek_getsigstr(struct gemtek_device *dev) | |
131 | { | |
132 | spin_lock(&lock); | |
133 | inb(io); | |
134 | udelay(5); | |
135 | spin_unlock(&lock); | |
136 | if (inb(io) & 8) /* bit set = no signal present */ | |
137 | return 0; | |
138 | return 1; /* signal present */ | |
139 | } | |
140 | ||
141 | static int gemtek_do_ioctl(struct inode *inode, struct file *file, | |
142 | unsigned int cmd, void *arg) | |
143 | { | |
144 | struct video_device *dev = video_devdata(file); | |
145 | struct gemtek_device *rt=dev->priv; | |
146 | ||
147 | switch(cmd) | |
148 | { | |
149 | case VIDIOCGCAP: | |
150 | { | |
151 | struct video_capability *v = arg; | |
152 | memset(v,0,sizeof(*v)); | |
153 | v->type=VID_TYPE_TUNER; | |
154 | v->channels=1; | |
155 | v->audios=1; | |
156 | strcpy(v->name, "GemTek"); | |
157 | return 0; | |
158 | } | |
159 | case VIDIOCGTUNER: | |
160 | { | |
161 | struct video_tuner *v = arg; | |
162 | if(v->tuner) /* Only 1 tuner */ | |
163 | return -EINVAL; | |
164 | v->rangelow=87*16000; | |
165 | v->rangehigh=108*16000; | |
166 | v->flags=VIDEO_TUNER_LOW; | |
167 | v->mode=VIDEO_MODE_AUTO; | |
168 | v->signal=0xFFFF*gemtek_getsigstr(rt); | |
169 | strcpy(v->name, "FM"); | |
170 | return 0; | |
171 | } | |
172 | case VIDIOCSTUNER: | |
173 | { | |
174 | struct video_tuner *v = arg; | |
175 | if(v->tuner!=0) | |
176 | return -EINVAL; | |
177 | /* Only 1 tuner so no setting needed ! */ | |
178 | return 0; | |
179 | } | |
180 | case VIDIOCGFREQ: | |
181 | { | |
182 | unsigned long *freq = arg; | |
183 | *freq = rt->curfreq; | |
184 | return 0; | |
185 | } | |
186 | case VIDIOCSFREQ: | |
187 | { | |
188 | unsigned long *freq = arg; | |
189 | rt->curfreq = *freq; | |
190 | /* needs to be called twice in order for getsigstr to work */ | |
191 | gemtek_setfreq(rt, rt->curfreq); | |
192 | gemtek_setfreq(rt, rt->curfreq); | |
193 | return 0; | |
194 | } | |
195 | case VIDIOCGAUDIO: | |
196 | { | |
197 | struct video_audio *v = arg; | |
198 | memset(v,0, sizeof(*v)); | |
199 | v->flags|=VIDEO_AUDIO_MUTABLE; | |
200 | v->volume=1; | |
201 | v->step=65535; | |
202 | strcpy(v->name, "Radio"); | |
203 | return 0; | |
204 | } | |
205 | case VIDIOCSAUDIO: | |
206 | { | |
207 | struct video_audio *v = arg; | |
208 | if(v->audio) | |
209 | return -EINVAL; | |
210 | ||
211 | if(v->flags&VIDEO_AUDIO_MUTE) | |
212 | gemtek_mute(rt); | |
213 | else | |
214 | gemtek_unmute(rt); | |
215 | ||
216 | return 0; | |
217 | } | |
218 | default: | |
219 | return -ENOIOCTLCMD; | |
220 | } | |
221 | } | |
222 | ||
223 | static int gemtek_ioctl(struct inode *inode, struct file *file, | |
224 | unsigned int cmd, unsigned long arg) | |
225 | { | |
226 | return video_usercopy(inode, file, cmd, arg, gemtek_do_ioctl); | |
227 | } | |
228 | ||
229 | static struct gemtek_device gemtek_unit; | |
230 | ||
231 | static struct file_operations gemtek_fops = { | |
232 | .owner = THIS_MODULE, | |
233 | .open = video_exclusive_open, | |
234 | .release = video_exclusive_release, | |
235 | .ioctl = gemtek_ioctl, | |
236 | .llseek = no_llseek, | |
237 | }; | |
238 | ||
239 | static struct video_device gemtek_radio= | |
240 | { | |
241 | .owner = THIS_MODULE, | |
242 | .name = "GemTek radio", | |
243 | .type = VID_TYPE_TUNER, | |
244 | .hardware = VID_HARDWARE_GEMTEK, | |
245 | .fops = &gemtek_fops, | |
246 | }; | |
247 | ||
248 | static int __init gemtek_init(void) | |
249 | { | |
250 | if(io==-1) | |
251 | { | |
252 | printk(KERN_ERR "You must set an I/O address with io=0x20c, io=0x30c, io=0x24c or io=0x34c (io=0x020c or io=0x248 for the combined sound/radiocard)\n"); | |
253 | return -EINVAL; | |
254 | } | |
255 | ||
256 | if (!request_region(io, 4, "gemtek")) | |
257 | { | |
258 | printk(KERN_ERR "gemtek: port 0x%x already in use\n", io); | |
259 | return -EBUSY; | |
260 | } | |
261 | ||
262 | gemtek_radio.priv=&gemtek_unit; | |
263 | ||
264 | if(video_register_device(&gemtek_radio, VFL_TYPE_RADIO, radio_nr)==-1) | |
265 | { | |
266 | release_region(io, 4); | |
267 | return -EINVAL; | |
268 | } | |
269 | printk(KERN_INFO "GemTek Radio Card driver.\n"); | |
270 | ||
271 | spin_lock_init(&lock); | |
272 | ||
273 | /* this is _maybe_ unnecessary */ | |
274 | outb(0x01, io); | |
275 | ||
276 | /* mute card - prevents noisy bootups */ | |
277 | gemtek_unit.muted = 0; | |
278 | gemtek_mute(&gemtek_unit); | |
279 | ||
280 | return 0; | |
281 | } | |
282 | ||
283 | MODULE_AUTHOR("Jonas Munsin"); | |
284 | MODULE_DESCRIPTION("A driver for the GemTek Radio Card"); | |
285 | MODULE_LICENSE("GPL"); | |
286 | ||
287 | module_param(io, int, 0); | |
288 | MODULE_PARM_DESC(io, "I/O address of the GemTek card (0x20c, 0x30c, 0x24c or 0x34c (0x20c or 0x248 have been reported to work for the combined sound/radiocard))."); | |
289 | module_param(radio_nr, int, 0); | |
290 | ||
291 | static void __exit gemtek_cleanup(void) | |
292 | { | |
293 | video_unregister_device(&gemtek_radio); | |
294 | release_region(io,4); | |
295 | } | |
296 | ||
297 | module_init(gemtek_init); | |
298 | module_exit(gemtek_cleanup); | |
299 | ||
300 | /* | |
301 | Local variables: | |
302 | compile-command: "gcc -c -DMODVERSIONS -D__KERNEL__ -DMODULE -O6 -Wall -Wstrict-prototypes -I /home/blp/tmp/linux-2.1.111-rtrack/include radio-rtrack2.c" | |
303 | End: | |
304 | */ |