1 /* radio-trust.c - Trust FM Radio card driver for Linux 2.2
2 * by Eric Lammerts <eric@scintilla.utwente.nl>
3 *
4 * Based on radio-aztech.c. Original notes:
5 *
6 * Adapted to support the Video for Linux API by
7 * Russell Kroll <rkroll@exploits.org>. Based on original tuner code by:
8 *
9 * Quay Ly
10 * Donald Song
11 * Jason Lewis (jlewis@twilight.vtc.vsc.edu)
12 * Scott McGrath (smcgrath@twilight.vtc.vsc.edu)
13 * William McGrath (wmcgrath@twilight.vtc.vsc.edu)
14 *
15 * The basis for this code may be found at http://bigbang.vtc.vsc.edu/fmradio/
16 */
17
18 #include <stdarg.h>
19 #include <linux/module.h>
20 #include <linux/init.h>
21 #include <linux/ioport.h>
22 #include <asm/io.h>
23 #include <asm/uaccess.h>
24 #include <linux/videodev.h>
25 #include <linux/config.h> /* CONFIG_RADIO_TRUST_PORT */
26
27 /* acceptable ports: 0x350 (JP3 shorted), 0x358 (JP3 open) */
28
29 #ifndef CONFIG_RADIO_TRUST_PORT
30 #define CONFIG_RADIO_TRUST_PORT -1
31 #endif
32
33 static int io = CONFIG_RADIO_TRUST_PORT;
34 static int radio_nr = -1;
35 static int ioval = 0xf;
36 static __u16 curvol;
37 static __u16 curbass;
38 static __u16 curtreble;
39 static unsigned long curfreq;
40 static int curstereo;
41 static int curmute;
42
43 /* i2c addresses */
44 #define TDA7318_ADDR 0x88
45 #define TSA6060T_ADDR 0xc4
46
47 #define TR_DELAY do { inb(io); inb(io); inb(io); } while(0)
48 #define TR_SET_SCL outb(ioval |= 2, io)
49 #define TR_CLR_SCL outb(ioval &= 0xfd, io)
50 #define TR_SET_SDA outb(ioval |= 1, io)
51 #define TR_CLR_SDA outb(ioval &= 0xfe, io)
52
53 static void write_i2c(int n, ...)
54 {
55 unsigned char val, mask;
56 va_list args;
57
58 va_start(args, n);
59
60 /* start condition */
61 TR_SET_SDA;
62 TR_SET_SCL;
63 TR_DELAY;
64 TR_CLR_SDA;
65 TR_CLR_SCL;
66 TR_DELAY;
67
68 for(; n; n--) {
69 val = va_arg(args, unsigned);
70 for(mask = 0x80; mask; mask >>= 1) {
71 if(val & mask)
72 TR_SET_SDA;
73 else
74 TR_CLR_SDA;
75 TR_SET_SCL;
76 TR_DELAY;
77 TR_CLR_SCL;
78 TR_DELAY;
79 }
80 /* acknowledge bit */
81 TR_SET_SDA;
82 TR_SET_SCL;
83 TR_DELAY;
84 TR_CLR_SCL;
85 TR_DELAY;
86 }
87
88 /* stop condition */
89 TR_CLR_SDA;
90 TR_DELAY;
91 TR_SET_SCL;
92 TR_DELAY;
93 TR_SET_SDA;
94 TR_DELAY;
95
96 va_end(args);
97 }
98
99 static void tr_setvol(__u16 vol)
100 {
101 curvol = vol / 2048;
102 write_i2c(2, TDA7318_ADDR, curvol ^ 0x1f);
103 }
104
105 static int basstreble2chip[15] = {
106 0, 1, 2, 3, 4, 5, 6, 7, 14, 13, 12, 11, 10, 9, 8
107 };
108
109 static void tr_setbass(__u16 bass)
110 {
111 curbass = bass / 4370;
112 write_i2c(2, TDA7318_ADDR, 0x60 | basstreble2chip[curbass]);
113 }
114
115 static void tr_settreble(__u16 treble)
116 {
117 curtreble = treble / 4370;
118 write_i2c(2, TDA7318_ADDR, 0x70 | basstreble2chip[curtreble]);
119 }
120
121 static void tr_setstereo(int stereo)
122 {
123 curstereo = !!stereo;
124 ioval = (ioval & 0xfb) | (!curstereo << 2);
125 outb(ioval, io);
126 }
127
128 static void tr_setmute(int mute)
129 {
130 curmute = !!mute;
131 ioval = (ioval & 0xf7) | (curmute << 3);
132 outb(ioval, io);
133 }
134
135 static int tr_getsigstr(void)
136 {
137 int i, v;
138
139 for(i = 0, v = 0; i < 100; i++) v |= inb(io);
140 return (v & 1)? 0 : 0xffff;
141 }
142
143 static int tr_getstereo(void)
144 {
145 /* don't know how to determine it, just return the setting */
146 return curstereo;
147 }
148
149 static void tr_setfreq(unsigned long f)
150 {
151 f /= 160; /* Convert to 10 kHz units */
152 f += 1070; /* Add 10.7 MHz IF */
153
154 write_i2c(5, TSA6060T_ADDR, (f << 1) | 1, f >> 7, 0x60 | ((f >> 15) & 1), 0);
155 }
156
157 static int tr_do_ioctl(struct inode *inode, struct file *file,
158 unsigned int cmd, void *arg)
159 {
160 switch(cmd)
161 {
162 case VIDIOCGCAP:
163 {
164 struct video_capability *v = arg;
165
166 memset(v,0,sizeof(*v));
167 v->type=VID_TYPE_TUNER;
168 v->channels=1;
169 v->audios=1;
170 strcpy(v->name, "Trust FM Radio");
171
172 return 0;
173 }
174 case VIDIOCGTUNER:
175 {
176 struct video_tuner *v = arg;
177
178 if(v->tuner) /* Only 1 tuner */
179 return -EINVAL;
180
181 v->rangelow = 87500 * 16;
182 v->rangehigh = 108000 * 16;
183 v->flags = VIDEO_TUNER_LOW;
184 v->mode = VIDEO_MODE_AUTO;
185
186 v->signal = tr_getsigstr();
187 if(tr_getstereo())
188 v->flags |= VIDEO_TUNER_STEREO_ON;
189
190 strcpy(v->name, "FM");
191
192 return 0;
193 }
194 case VIDIOCSTUNER:
195 {
196 struct video_tuner *v = arg;
197 if(v->tuner != 0)
198 return -EINVAL;
199 return 0;
200 }
201 case VIDIOCGFREQ:
202 {
203 unsigned long *freq = arg;
204 *freq = curfreq;
205 return 0;
206 }
207 case VIDIOCSFREQ:
208 {
209 unsigned long *freq = arg;
210 tr_setfreq(*freq);
211 return 0;
212 }
213 case VIDIOCGAUDIO:
214 {
215 struct video_audio *v = arg;
216
217 memset(v,0, sizeof(*v));
218 v->flags = VIDEO_AUDIO_MUTABLE | VIDEO_AUDIO_VOLUME |
219 VIDEO_AUDIO_BASS | VIDEO_AUDIO_TREBLE;
220 v->mode = curstereo? VIDEO_SOUND_STEREO : VIDEO_SOUND_MONO;
221 v->volume = curvol * 2048;
222 v->step = 2048;
223 v->bass = curbass * 4370;
224 v->treble = curtreble * 4370;
225
226 strcpy(v->name, "Trust FM Radio");
227 return 0;
228 }
229 case VIDIOCSAUDIO:
230 {
231 struct video_audio *v = arg;
232
233 if(v->audio)
234 return -EINVAL;
235 tr_setvol(v->volume);
236 tr_setbass(v->bass);
237 tr_settreble(v->treble);
238 tr_setstereo(v->mode & VIDEO_SOUND_STEREO);
239 tr_setmute(v->flags & VIDEO_AUDIO_MUTE);
240 return 0;
241 }
242 default:
243 return -ENOIOCTLCMD;
244 }
245 }
246
247 static int tr_ioctl(struct inode *inode, struct file *file,
248 unsigned int cmd, unsigned long arg)
249 {
250 return video_usercopy(inode, file, cmd, arg, tr_do_ioctl);
251 }
252
253 static struct file_operations trust_fops = {
254 .owner = THIS_MODULE,
255 .open = video_exclusive_open,
256 .release = video_exclusive_release,
257 .ioctl = tr_ioctl,
258 .compat_ioctl = v4l_compat_ioctl32,
259 .llseek = no_llseek,
260 };
261
262 static struct video_device trust_radio=
263 {
264 .owner = THIS_MODULE,
265 .name = "Trust FM Radio",
266 .type = VID_TYPE_TUNER,
267 .hardware = VID_HARDWARE_TRUST,
268 .fops = &trust_fops,
269 };
270
271 static int __init trust_init(void)
272 {
273 if(io == -1) {
274 printk(KERN_ERR "You must set an I/O address with io=0x???\n");
275 return -EINVAL;
276 }
277 if(!request_region(io, 2, "Trust FM Radio")) {
278 printk(KERN_ERR "trust: port 0x%x already in use\n", io);
279 return -EBUSY;
280 }
281 if(video_register_device(&trust_radio, VFL_TYPE_RADIO, radio_nr)==-1)
282 {
283 release_region(io, 2);
284 return -EINVAL;
285 }
286
287 printk(KERN_INFO "Trust FM Radio card driver v1.0.\n");
288
289 write_i2c(2, TDA7318_ADDR, 0x80); /* speaker att. LF = 0 dB */
290 write_i2c(2, TDA7318_ADDR, 0xa0); /* speaker att. RF = 0 dB */
291 write_i2c(2, TDA7318_ADDR, 0xc0); /* speaker att. LR = 0 dB */
292 write_i2c(2, TDA7318_ADDR, 0xe0); /* speaker att. RR = 0 dB */
293 write_i2c(2, TDA7318_ADDR, 0x40); /* stereo 1 input, gain = 18.75 dB */
294
295 tr_setvol(0x8000);
296 tr_setbass(0x8000);
297 tr_settreble(0x8000);
298 tr_setstereo(1);
299
300 /* mute card - prevents noisy bootups */
301 tr_setmute(1);
302
303 return 0;
304 }
305
306 MODULE_AUTHOR("Eric Lammerts, Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
307 MODULE_DESCRIPTION("A driver for the Trust FM Radio card.");
308 MODULE_LICENSE("GPL");
309
310 module_param(io, int, 0);
311 MODULE_PARM_DESC(io, "I/O address of the Trust FM Radio card (0x350 or 0x358)");
312 module_param(radio_nr, int, 0);
313
314 static void __exit cleanup_trust_module(void)
315 {
316 video_unregister_device(&trust_radio);
317 release_region(io, 2);
318 }
319
320 module_init(trust_init);
321 module_exit(cleanup_trust_module);
322
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