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31#include <linux/module.h>
32#include <linux/init.h>
33#include <linux/ioport.h>
34#include <linux/version.h>
35#include <linux/videodev2.h>
36#include <linux/io.h>
37#include <media/v4l2-device.h>
38#include <media/v4l2-ioctl.h>
39
40MODULE_AUTHOR("Dr. Henrik Seidel");
41MODULE_DESCRIPTION("A driver for the Typhoon radio card (a.k.a. EcoRadio).");
42MODULE_LICENSE("GPL");
43
44#ifndef CONFIG_RADIO_TYPHOON_PORT
45#define CONFIG_RADIO_TYPHOON_PORT -1
46#endif
47
48#ifndef CONFIG_RADIO_TYPHOON_MUTEFREQ
49#define CONFIG_RADIO_TYPHOON_MUTEFREQ 0
50#endif
51
52static int io = CONFIG_RADIO_TYPHOON_PORT;
53static int radio_nr = -1;
54
55module_param(io, int, 0);
56MODULE_PARM_DESC(io, "I/O address of the Typhoon card (0x316 or 0x336)");
57
58module_param(radio_nr, int, 0);
59
60static unsigned long mutefreq = CONFIG_RADIO_TYPHOON_MUTEFREQ;
61module_param(mutefreq, ulong, 0);
62MODULE_PARM_DESC(mutefreq, "Frequency used when muting the card (in kHz)");
63
64#define RADIO_VERSION KERNEL_VERSION(0, 1, 1)
65
66#define BANNER "Typhoon Radio Card driver v0.1.1\n"
67
68struct typhoon {
69 struct v4l2_device v4l2_dev;
70 struct video_device vdev;
71 int io;
72 int curvol;
73 int muted;
74 unsigned long curfreq;
75 unsigned long mutefreq;
76 struct mutex lock;
77};
78
79static struct typhoon typhoon_card;
80
81static void typhoon_setvol_generic(struct typhoon *dev, int vol)
82{
83 mutex_lock(&dev->lock);
84 vol >>= 14;
85 vol &= 3;
86 outb_p(vol / 2, dev->io);
87 outb_p(vol % 2, dev->io + 2);
88 mutex_unlock(&dev->lock);
89}
90
91static int typhoon_setfreq_generic(struct typhoon *dev,
92 unsigned long frequency)
93{
94 unsigned long outval;
95 unsigned long x;
96
97
98
99
100
101
102
103
104
105
106
107
108 mutex_lock(&dev->lock);
109 x = frequency / 160;
110 outval = (x * x + 2500) / 5000;
111 outval = (outval * x + 5000) / 10000;
112 outval -= (10 * x * x + 10433) / 20866;
113 outval += 4 * x - 11505;
114
115 outb_p((outval >> 8) & 0x01, dev->io + 4);
116 outb_p(outval >> 9, dev->io + 6);
117 outb_p(outval & 0xff, dev->io + 8);
118 mutex_unlock(&dev->lock);
119
120 return 0;
121}
122
123static int typhoon_setfreq(struct typhoon *dev, unsigned long frequency)
124{
125 typhoon_setfreq_generic(dev, frequency);
126 dev->curfreq = frequency;
127 return 0;
128}
129
130static void typhoon_mute(struct typhoon *dev)
131{
132 if (dev->muted == 1)
133 return;
134 typhoon_setvol_generic(dev, 0);
135 typhoon_setfreq_generic(dev, dev->mutefreq);
136 dev->muted = 1;
137}
138
139static void typhoon_unmute(struct typhoon *dev)
140{
141 if (dev->muted == 0)
142 return;
143 typhoon_setfreq_generic(dev, dev->curfreq);
144 typhoon_setvol_generic(dev, dev->curvol);
145 dev->muted = 0;
146}
147
148static int typhoon_setvol(struct typhoon *dev, int vol)
149{
150 if (dev->muted && vol != 0) {
151 dev->curvol = vol;
152 typhoon_unmute(dev);
153 return 0;
154 }
155 if (vol == dev->curvol)
156 return 0;
157
158 if (vol == 0) {
159 typhoon_mute(dev);
160 dev->curvol = vol;
161 return 0;
162 }
163 typhoon_setvol_generic(dev, vol);
164 dev->curvol = vol;
165 return 0;
166}
167
168static int vidioc_querycap(struct file *file, void *priv,
169 struct v4l2_capability *v)
170{
171 strlcpy(v->driver, "radio-typhoon", sizeof(v->driver));
172 strlcpy(v->card, "Typhoon Radio", sizeof(v->card));
173 strlcpy(v->bus_info, "ISA", sizeof(v->bus_info));
174 v->version = RADIO_VERSION;
175 v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
176 return 0;
177}
178
179static int vidioc_g_tuner(struct file *file, void *priv,
180 struct v4l2_tuner *v)
181{
182 if (v->index > 0)
183 return -EINVAL;
184
185 strlcpy(v->name, "FM", sizeof(v->name));
186 v->type = V4L2_TUNER_RADIO;
187 v->rangelow = 87.5 * 16000;
188 v->rangehigh = 108 * 16000;
189 v->rxsubchans = V4L2_TUNER_SUB_MONO;
190 v->capability = V4L2_TUNER_CAP_LOW;
191 v->audmode = V4L2_TUNER_MODE_MONO;
192 v->signal = 0xFFFF;
193 return 0;
194}
195
196static int vidioc_s_tuner(struct file *file, void *priv,
197 struct v4l2_tuner *v)
198{
199 return v->index ? -EINVAL : 0;
200}
201
202static int vidioc_g_frequency(struct file *file, void *priv,
203 struct v4l2_frequency *f)
204{
205 struct typhoon *dev = video_drvdata(file);
206
207 if (f->tuner != 0)
208 return -EINVAL;
209 f->type = V4L2_TUNER_RADIO;
210 f->frequency = dev->curfreq;
211 return 0;
212}
213
214static int vidioc_s_frequency(struct file *file, void *priv,
215 struct v4l2_frequency *f)
216{
217 struct typhoon *dev = video_drvdata(file);
218
219 if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
220 return -EINVAL;
221 dev->curfreq = f->frequency;
222 typhoon_setfreq(dev, dev->curfreq);
223 return 0;
224}
225
226static int vidioc_queryctrl(struct file *file, void *priv,
227 struct v4l2_queryctrl *qc)
228{
229 switch (qc->id) {
230 case V4L2_CID_AUDIO_MUTE:
231 return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
232 case V4L2_CID_AUDIO_VOLUME:
233 return v4l2_ctrl_query_fill(qc, 0, 65535, 16384, 65535);
234 }
235 return -EINVAL;
236}
237
238static int vidioc_g_ctrl(struct file *file, void *priv,
239 struct v4l2_control *ctrl)
240{
241 struct typhoon *dev = video_drvdata(file);
242
243 switch (ctrl->id) {
244 case V4L2_CID_AUDIO_MUTE:
245 ctrl->value = dev->muted;
246 return 0;
247 case V4L2_CID_AUDIO_VOLUME:
248 ctrl->value = dev->curvol;
249 return 0;
250 }
251 return -EINVAL;
252}
253
254static int vidioc_s_ctrl (struct file *file, void *priv,
255 struct v4l2_control *ctrl)
256{
257 struct typhoon *dev = video_drvdata(file);
258
259 switch (ctrl->id) {
260 case V4L2_CID_AUDIO_MUTE:
261 if (ctrl->value)
262 typhoon_mute(dev);
263 else
264 typhoon_unmute(dev);
265 return 0;
266 case V4L2_CID_AUDIO_VOLUME:
267 typhoon_setvol(dev, ctrl->value);
268 return 0;
269 }
270 return -EINVAL;
271}
272
273static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
274{
275 *i = 0;
276 return 0;
277}
278
279static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
280{
281 return i ? -EINVAL : 0;
282}
283
284static int vidioc_g_audio(struct file *file, void *priv,
285 struct v4l2_audio *a)
286{
287 a->index = 0;
288 strlcpy(a->name, "Radio", sizeof(a->name));
289 a->capability = V4L2_AUDCAP_STEREO;
290 return 0;
291}
292
293static int vidioc_s_audio(struct file *file, void *priv,
294 struct v4l2_audio *a)
295{
296 return a->index ? -EINVAL : 0;
297}
298
299static int vidioc_log_status(struct file *file, void *priv)
300{
301 struct typhoon *dev = video_drvdata(file);
302 struct v4l2_device *v4l2_dev = &dev->v4l2_dev;
303
304 v4l2_info(v4l2_dev, BANNER);
305#ifdef MODULE
306 v4l2_info(v4l2_dev, "Load type: Driver loaded as a module\n\n");
307#else
308 v4l2_info(v4l2_dev, "Load type: Driver compiled into kernel\n\n");
309#endif
310 v4l2_info(v4l2_dev, "frequency = %lu kHz\n", dev->curfreq >> 4);
311 v4l2_info(v4l2_dev, "volume = %d\n", dev->curvol);
312 v4l2_info(v4l2_dev, "mute = %s\n", dev->muted ? "on" : "off");
313 v4l2_info(v4l2_dev, "io = 0x%x\n", dev->io);
314 v4l2_info(v4l2_dev, "mute frequency = %lu kHz\n", dev->mutefreq >> 4);
315 return 0;
316}
317
318static const struct v4l2_file_operations typhoon_fops = {
319 .owner = THIS_MODULE,
320 .unlocked_ioctl = video_ioctl2,
321};
322
323static const struct v4l2_ioctl_ops typhoon_ioctl_ops = {
324 .vidioc_log_status = vidioc_log_status,
325 .vidioc_querycap = vidioc_querycap,
326 .vidioc_g_tuner = vidioc_g_tuner,
327 .vidioc_s_tuner = vidioc_s_tuner,
328 .vidioc_g_audio = vidioc_g_audio,
329 .vidioc_s_audio = vidioc_s_audio,
330 .vidioc_g_input = vidioc_g_input,
331 .vidioc_s_input = vidioc_s_input,
332 .vidioc_g_frequency = vidioc_g_frequency,
333 .vidioc_s_frequency = vidioc_s_frequency,
334 .vidioc_queryctrl = vidioc_queryctrl,
335 .vidioc_g_ctrl = vidioc_g_ctrl,
336 .vidioc_s_ctrl = vidioc_s_ctrl,
337};
338
339static int __init typhoon_init(void)
340{
341 struct typhoon *dev = &typhoon_card;
342 struct v4l2_device *v4l2_dev = &dev->v4l2_dev;
343 int res;
344
345 strlcpy(v4l2_dev->name, "typhoon", sizeof(v4l2_dev->name));
346 dev->io = io;
347
348 if (dev->io == -1) {
349 v4l2_err(v4l2_dev, "You must set an I/O address with io=0x316 or io=0x336\n");
350 return -EINVAL;
351 }
352
353 if (mutefreq < 87000 || mutefreq > 108500) {
354 v4l2_err(v4l2_dev, "You must set a frequency (in kHz) used when muting the card,\n");
355 v4l2_err(v4l2_dev, "e.g. with \"mutefreq=87500\" (87000 <= mutefreq <= 108500)\n");
356 return -EINVAL;
357 }
358 dev->curfreq = dev->mutefreq = mutefreq << 4;
359
360 mutex_init(&dev->lock);
361 if (!request_region(dev->io, 8, "typhoon")) {
362 v4l2_err(v4l2_dev, "port 0x%x already in use\n",
363 dev->io);
364 return -EBUSY;
365 }
366
367 res = v4l2_device_register(NULL, v4l2_dev);
368 if (res < 0) {
369 release_region(dev->io, 8);
370 v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
371 return res;
372 }
373 v4l2_info(v4l2_dev, BANNER);
374
375 strlcpy(dev->vdev.name, v4l2_dev->name, sizeof(dev->vdev.name));
376 dev->vdev.v4l2_dev = v4l2_dev;
377 dev->vdev.fops = &typhoon_fops;
378 dev->vdev.ioctl_ops = &typhoon_ioctl_ops;
379 dev->vdev.release = video_device_release_empty;
380 video_set_drvdata(&dev->vdev, dev);
381
382
383 typhoon_mute(dev);
384
385 if (video_register_device(&dev->vdev, VFL_TYPE_RADIO, radio_nr) < 0) {
386 v4l2_device_unregister(&dev->v4l2_dev);
387 release_region(dev->io, 8);
388 return -EINVAL;
389 }
390 v4l2_info(v4l2_dev, "port 0x%x.\n", dev->io);
391 v4l2_info(v4l2_dev, "mute frequency is %lu kHz.\n", mutefreq);
392
393 return 0;
394}
395
396static void __exit typhoon_exit(void)
397{
398 struct typhoon *dev = &typhoon_card;
399
400 video_unregister_device(&dev->vdev);
401 v4l2_device_unregister(&dev->v4l2_dev);
402 release_region(dev->io, 8);
403}
404
405module_init(typhoon_init);
406module_exit(typhoon_exit);
407
408
