1 /* radio-aztech.c - Aztech radio card driver for Linux 2.2
2 *
3 * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
4 * Adapted to support the Video for Linux API by
5 * Russell Kroll <rkroll@exploits.org>. Based on original tuner code by:
6 *
7 * Quay Ly
8 * Donald Song
9 * Jason Lewis (jlewis@twilight.vtc.vsc.edu)
10 * Scott McGrath (smcgrath@twilight.vtc.vsc.edu)
11 * William McGrath (wmcgrath@twilight.vtc.vsc.edu)
12 *
13 * The basis for this code may be found at http://bigbang.vtc.vsc.edu/fmradio/
14 * along with more information on the card itself.
15 *
16 * History:
17 * 1999-02-24 Russell Kroll <rkroll@exploits.org>
18 * Fine tuning/VIDEO_TUNER_LOW
19 * Range expanded to 87-108 MHz (from 87.9-107.8)
20 *
21 * Notable changes from the original source:
22 * - includes stripped down to the essentials
23 * - for loops used as delays replaced with udelay()
24 * - #defines removed, changed to static values
25 * - tuning structure changed - no more character arrays, other changes
26 */
27
28 #include <linux/module.h> /* Modules */
29 #include <linux/init.h> /* Initdata */
30 #include <linux/ioport.h> /* request_region */
31 #include <linux/delay.h> /* udelay */
32 #include <linux/videodev2.h> /* kernel radio structs */
33 #include <linux/version.h> /* for KERNEL_VERSION MACRO */
34 #include <linux/io.h> /* outb, outb_p */
35 #include <media/v4l2-device.h>
36 #include <media/v4l2-ioctl.h>
37
38 MODULE_AUTHOR("Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
39 MODULE_DESCRIPTION("A driver for the Aztech radio card.");
40 MODULE_LICENSE("GPL");
41
42 /* acceptable ports: 0x350 (JP3 shorted), 0x358 (JP3 open) */
43
44 #ifndef CONFIG_RADIO_AZTECH_PORT
45 #define CONFIG_RADIO_AZTECH_PORT -1
46 #endif
47
48 static int io = CONFIG_RADIO_AZTECH_PORT;
49 static int radio_nr = -1;
50 static int radio_wait_time = 1000;
51
52 module_param(io, int, 0);
53 module_param(radio_nr, int, 0);
54 MODULE_PARM_DESC(io, "I/O address of the Aztech card (0x350 or 0x358)");
55
56 #define RADIO_VERSION KERNEL_VERSION(0, 0, 2)
57
58 struct aztech
59 {
60 struct v4l2_device v4l2_dev;
61 struct video_device vdev;
62 int io;
63 int curvol;
64 unsigned long curfreq;
65 int stereo;
66 struct mutex lock;
67 };
68
69 static struct aztech aztech_card;
70
71 static int volconvert(int level)
72 {
73 level >>= 14; /* Map 16bits down to 2 bit */
74 level &= 3;
75
76 /* convert to card-friendly values */
77 switch (level) {
78 case 0:
79 return 0;
80 case 1:
81 return 1;
82 case 2:
83 return 4;
84 case 3:
85 return 5;
86 }
87 return 0; /* Quieten gcc */
88 }
89
90 static void send_0_byte(struct aztech *az)
91 {
92 udelay(radio_wait_time);
93 outb_p(2 + volconvert(az->curvol), az->io);
94 outb_p(64 + 2 + volconvert(az->curvol), az->io);
95 }
96
97 static void send_1_byte(struct aztech *az)
98 {
99 udelay (radio_wait_time);
100 outb_p(128 + 2 + volconvert(az->curvol), az->io);
101 outb_p(128 + 64 + 2 + volconvert(az->curvol), az->io);
102 }
103
104 static int az_setvol(struct aztech *az, int vol)
105 {
106 mutex_lock(&az->lock);
107 outb(volconvert(vol), az->io);
108 mutex_unlock(&az->lock);
109 return 0;
110 }
111
112 /* thanks to Michael Dwyer for giving me a dose of clues in
113 * the signal strength department..
114 *
115 * This card has a stereo bit - bit 0 set = mono, not set = stereo
116 * It also has a "signal" bit - bit 1 set = bad signal, not set = good
117 *
118 */
119
120 static int az_getsigstr(struct aztech *az)
121 {
122 int sig = 1;
123
124 mutex_lock(&az->lock);
125 if (inb(az->io) & 2) /* bit set = no signal present */
126 sig = 0;
127 mutex_unlock(&az->lock);
128 return sig;
129 }
130
131 static int az_getstereo(struct aztech *az)
132 {
133 int stereo = 1;
134
135 mutex_lock(&az->lock);
136 if (inb(az->io) & 1) /* bit set = mono */
137 stereo = 0;
138 mutex_unlock(&az->lock);
139 return stereo;
140 }
141
142 static int az_setfreq(struct aztech *az, unsigned long frequency)
143 {
144 int i;
145
146 mutex_lock(&az->lock);
147
148 az->curfreq = frequency;
149 frequency += 171200; /* Add 10.7 MHz IF */
150 frequency /= 800; /* Convert to 50 kHz units */
151
152 send_0_byte(az); /* 0: LSB of frequency */
153
154 for (i = 0; i < 13; i++) /* : frequency bits (1-13) */
155 if (frequency & (1 << i))
156 send_1_byte(az);
157 else
158 send_0_byte(az);
159
160 send_0_byte(az); /* 14: test bit - always 0 */
161 send_0_byte(az); /* 15: test bit - always 0 */
162 send_0_byte(az); /* 16: band data 0 - always 0 */
163 if (az->stereo) /* 17: stereo (1 to enable) */
164 send_1_byte(az);
165 else
166 send_0_byte(az);
167
168 send_1_byte(az); /* 18: band data 1 - unknown */
169 send_0_byte(az); /* 19: time base - always 0 */
170 send_0_byte(az); /* 20: spacing (0 = 25 kHz) */
171 send_1_byte(az); /* 21: spacing (1 = 25 kHz) */
172 send_0_byte(az); /* 22: spacing (0 = 25 kHz) */
173 send_1_byte(az); /* 23: AM/FM (FM = 1, always) */
174
175 /* latch frequency */
176
177 udelay(radio_wait_time);
178 outb_p(128 + 64 + volconvert(az->curvol), az->io);
179
180 mutex_unlock(&az->lock);
181
182 return 0;
183 }
184
185 static int vidioc_querycap(struct file *file, void *priv,
186 struct v4l2_capability *v)
187 {
188 strlcpy(v->driver, "radio-aztech", sizeof(v->driver));
189 strlcpy(v->card, "Aztech Radio", sizeof(v->card));
190 strlcpy(v->bus_info, "ISA", sizeof(v->bus_info));
191 v->version = RADIO_VERSION;
192 v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
193 return 0;
194 }
195
196 static int vidioc_g_tuner(struct file *file, void *priv,
197 struct v4l2_tuner *v)
198 {
199 struct aztech *az = video_drvdata(file);
200
201 if (v->index > 0)
202 return -EINVAL;
203
204 strlcpy(v->name, "FM", sizeof(v->name));
205 v->type = V4L2_TUNER_RADIO;
206
207 v->rangelow = 87 * 16000;
208 v->rangehigh = 108 * 16000;
209 v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
210 v->capability = V4L2_TUNER_CAP_LOW;
211 if (az_getstereo(az))
212 v->audmode = V4L2_TUNER_MODE_STEREO;
213 else
214 v->audmode = V4L2_TUNER_MODE_MONO;
215 v->signal = 0xFFFF * az_getsigstr(az);
216
217 return 0;
218 }
219
220 static int vidioc_s_tuner(struct file *file, void *priv,
221 struct v4l2_tuner *v)
222 {
223 return v->index ? -EINVAL : 0;
224 }
225
226 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
227 {
228 *i = 0;
229 return 0;
230 }
231
232 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
233 {
234 return i ? -EINVAL : 0;
235 }
236
237 static int vidioc_g_audio(struct file *file, void *priv,
238 struct v4l2_audio *a)
239 {
240 a->index = 0;
241 strlcpy(a->name, "Radio", sizeof(a->name));
242 a->capability = V4L2_AUDCAP_STEREO;
243 return 0;
244 }
245
246 static int vidioc_s_audio(struct file *file, void *priv,
247 struct v4l2_audio *a)
248 {
249 return a->index ? -EINVAL : 0;
250 }
251
252 static int vidioc_s_frequency(struct file *file, void *priv,
253 struct v4l2_frequency *f)
254 {
255 struct aztech *az = video_drvdata(file);
256
257 az_setfreq(az, f->frequency);
258 return 0;
259 }
260
261 static int vidioc_g_frequency(struct file *file, void *priv,
262 struct v4l2_frequency *f)
263 {
264 struct aztech *az = video_drvdata(file);
265
266 f->type = V4L2_TUNER_RADIO;
267 f->frequency = az->curfreq;
268 return 0;
269 }
270
271 static int vidioc_queryctrl(struct file *file, void *priv,
272 struct v4l2_queryctrl *qc)
273 {
274 switch (qc->id) {
275 case V4L2_CID_AUDIO_MUTE:
276 return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
277 case V4L2_CID_AUDIO_VOLUME:
278 return v4l2_ctrl_query_fill(qc, 0, 0xff, 1, 0xff);
279 }
280 return -EINVAL;
281 }
282
283 static int vidioc_g_ctrl(struct file *file, void *priv,
284 struct v4l2_control *ctrl)
285 {
286 struct aztech *az = video_drvdata(file);
287
288 switch (ctrl->id) {
289 case V4L2_CID_AUDIO_MUTE:
290 if (az->curvol == 0)
291 ctrl->value = 1;
292 else
293 ctrl->value = 0;
294 return 0;
295 case V4L2_CID_AUDIO_VOLUME:
296 ctrl->value = az->curvol * 6554;
297 return 0;
298 }
299 return -EINVAL;
300 }
301
302 static int vidioc_s_ctrl(struct file *file, void *priv,
303 struct v4l2_control *ctrl)
304 {
305 struct aztech *az = video_drvdata(file);
306
307 switch (ctrl->id) {
308 case V4L2_CID_AUDIO_MUTE:
309 if (ctrl->value)
310 az_setvol(az, 0);
311 else
312 az_setvol(az, az->curvol);
313 return 0;
314 case V4L2_CID_AUDIO_VOLUME:
315 az_setvol(az, ctrl->value);
316 return 0;
317 }
318 return -EINVAL;
319 }
320
321 static const struct v4l2_file_operations aztech_fops = {
322 .owner = THIS_MODULE,
323 .ioctl = video_ioctl2,
324 };
325
326 static const struct v4l2_ioctl_ops aztech_ioctl_ops = {
327 .vidioc_querycap = vidioc_querycap,
328 .vidioc_g_tuner = vidioc_g_tuner,
329 .vidioc_s_tuner = vidioc_s_tuner,
330 .vidioc_g_audio = vidioc_g_audio,
331 .vidioc_s_audio = vidioc_s_audio,
332 .vidioc_g_input = vidioc_g_input,
333 .vidioc_s_input = vidioc_s_input,
334 .vidioc_g_frequency = vidioc_g_frequency,
335 .vidioc_s_frequency = vidioc_s_frequency,
336 .vidioc_queryctrl = vidioc_queryctrl,
337 .vidioc_g_ctrl = vidioc_g_ctrl,
338 .vidioc_s_ctrl = vidioc_s_ctrl,
339 };
340
341 static int __init aztech_init(void)
342 {
343 struct aztech *az = &aztech_card;
344 struct v4l2_device *v4l2_dev = &az->v4l2_dev;
345 int res;
346
347 strlcpy(v4l2_dev->name, "aztech", sizeof(v4l2_dev->name));
348 az->io = io;
349
350 if (az->io == -1) {
351 v4l2_err(v4l2_dev, "you must set an I/O address with io=0x350 or 0x358\n");
352 return -EINVAL;
353 }
354
355 if (!request_region(az->io, 2, "aztech")) {
356 v4l2_err(v4l2_dev, "port 0x%x already in use\n", az->io);
357 return -EBUSY;
358 }
359
360 res = v4l2_device_register(NULL, v4l2_dev);
361 if (res < 0) {
362 release_region(az->io, 2);
363 v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
364 return res;
365 }
366
367 mutex_init(&az->lock);
368 strlcpy(az->vdev.name, v4l2_dev->name, sizeof(az->vdev.name));
369 az->vdev.v4l2_dev = v4l2_dev;
370 az->vdev.fops = &aztech_fops;
371 az->vdev.ioctl_ops = &aztech_ioctl_ops;
372 az->vdev.release = video_device_release_empty;
373 video_set_drvdata(&az->vdev, az);
374
375 if (video_register_device(&az->vdev, VFL_TYPE_RADIO, radio_nr) < 0) {
376 v4l2_device_unregister(v4l2_dev);
377 release_region(az->io, 2);
378 return -EINVAL;
379 }
380
381 v4l2_info(v4l2_dev, "Aztech radio card driver v1.00/19990224 rkroll@exploits.org\n");
382 /* mute card - prevents noisy bootups */
383 outb(0, az->io);
384 return 0;
385 }
386
387 static void __exit aztech_exit(void)
388 {
389 struct aztech *az = &aztech_card;
390
391 video_unregister_device(&az->vdev);
392 v4l2_device_unregister(&az->v4l2_dev);
393 release_region(az->io, 2);
394 }
395
396 module_init(aztech_init);
397 module_exit(aztech_exit);
398
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