1 /* Typhoon Radio Card driver for radio support
2 * (c) 1999 Dr. Henrik Seidel <Henrik.Seidel@gmx.de>
5 * http://194.18.155.92/idc/prod2.idc?nr=50753&lang=e
7 * Notes on the hardware
9 * This card has two output sockets, one for speakers and one for line.
10 * The speaker output has volume control, but only in four discrete
11 * steps. The line output has neither volume control nor mute.
13 * The card has auto-stereo according to its manual, although it all
14 * sounds mono to me (even with the Win/DOS drivers). Maybe it's my
15 * antenna - I really don't know for sure.
17 * Frequency control is done digitally.
19 * Volume control is done digitally, but there are only four different
20 * possible values. So you should better always turn the volume up and
21 * use line control. I got the best results by connecting line output
22 * to the sound card microphone input. For such a configuration the
23 * volume control has no effect, since volume control only influences
26 * There is no explicit mute/unmute. So I set the radio frequency to a
27 * value where I do expect just noise and turn the speaker volume down.
28 * The frequency change is necessary since the card never seems to be
31 * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
34 #include <linux/module.h> /* Modules */
35 #include <linux/init.h> /* Initdata */
36 #include <linux/ioport.h> /* request_region */
37 #include <linux/proc_fs.h> /* radio card status report */
38 #include <asm/io.h> /* outb, outb_p */
39 #include <asm/uaccess.h> /* copy to/from user */
40 #include <linux/videodev2.h> /* kernel radio structs */
41 #include <media/v4l2-common.h>
43 #include <linux/version.h> /* for KERNEL_VERSION MACRO */
44 #define RADIO_VERSION KERNEL_VERSION(0,1,1)
45 #define BANNER "Typhoon Radio Card driver v0.1.1\n"
47 static struct v4l2_queryctrl radio_qctrl[] = {
49 .id = V4L2_CID_AUDIO_MUTE,
54 .type = V4L2_CTRL_TYPE_BOOLEAN,
56 .id = V4L2_CID_AUDIO_VOLUME,
61 .default_value = 0xff,
62 .type = V4L2_CTRL_TYPE_INTEGER,
67 #ifndef CONFIG_RADIO_TYPHOON_PORT
68 #define CONFIG_RADIO_TYPHOON_PORT -1
71 #ifndef CONFIG_RADIO_TYPHOON_MUTEFREQ
72 #define CONFIG_RADIO_TYPHOON_MUTEFREQ 0
75 #ifndef CONFIG_PROC_FS
76 #undef CONFIG_RADIO_TYPHOON_PROC_FS
79 struct typhoon_device {
84 unsigned long curfreq;
85 unsigned long mutefreq;
89 static void typhoon_setvol_generic(struct typhoon_device *dev, int vol);
90 static int typhoon_setfreq_generic(struct typhoon_device *dev,
91 unsigned long frequency);
92 static int typhoon_setfreq(struct typhoon_device *dev, unsigned long frequency);
93 static void typhoon_mute(struct typhoon_device *dev);
94 static void typhoon_unmute(struct typhoon_device *dev);
95 static int typhoon_setvol(struct typhoon_device *dev, int vol);
96 #ifdef CONFIG_RADIO_TYPHOON_PROC_FS
97 static int typhoon_get_info(char *buf, char **start, off_t offset, int len);
100 static void typhoon_setvol_generic(struct typhoon_device *dev, int vol)
102 mutex_lock(&dev->lock);
103 vol >>= 14; /* Map 16 bit to 2 bit */
105 outb_p(vol / 2, dev->iobase); /* Set the volume, high bit. */
106 outb_p(vol % 2, dev->iobase + 2); /* Set the volume, low bit. */
107 mutex_unlock(&dev->lock);
110 static int typhoon_setfreq_generic(struct typhoon_device *dev,
111 unsigned long frequency)
113 unsigned long outval;
117 * The frequency transfer curve is not linear. The best fit I could
120 * outval = -155 + exp((f + 15.55) * 0.057))
122 * where frequency f is in MHz. Since we don't have exp in the kernel,
123 * I approximate this function by a third order polynomial.
127 mutex_lock(&dev->lock);
129 outval = (x * x + 2500) / 5000;
130 outval = (outval * x + 5000) / 10000;
131 outval -= (10 * x * x + 10433) / 20866;
132 outval += 4 * x - 11505;
134 outb_p((outval >> 8) & 0x01, dev->iobase + 4);
135 outb_p(outval >> 9, dev->iobase + 6);
136 outb_p(outval & 0xff, dev->iobase + 8);
137 mutex_unlock(&dev->lock);
142 static int typhoon_setfreq(struct typhoon_device *dev, unsigned long frequency)
144 typhoon_setfreq_generic(dev, frequency);
145 dev->curfreq = frequency;
149 static void typhoon_mute(struct typhoon_device *dev)
153 typhoon_setvol_generic(dev, 0);
154 typhoon_setfreq_generic(dev, dev->mutefreq);
158 static void typhoon_unmute(struct typhoon_device *dev)
162 typhoon_setfreq_generic(dev, dev->curfreq);
163 typhoon_setvol_generic(dev, dev->curvol);
167 static int typhoon_setvol(struct typhoon_device *dev, int vol)
169 if (dev->muted && vol != 0) { /* user is unmuting the card */
174 if (vol == dev->curvol) /* requested volume == current */
177 if (vol == 0) { /* volume == 0 means mute the card */
182 typhoon_setvol_generic(dev, vol);
187 static int vidioc_querycap(struct file *file, void *priv,
188 struct v4l2_capability *v)
190 strlcpy(v->driver, "radio-typhoon", sizeof(v->driver));
191 strlcpy(v->card, "Typhoon Radio", sizeof(v->card));
192 sprintf(v->bus_info, "ISA");
193 v->version = RADIO_VERSION;
194 v->capabilities = V4L2_CAP_TUNER;
198 static int vidioc_g_tuner(struct file *file, void *priv,
199 struct v4l2_tuner *v)
204 strcpy(v->name, "FM");
205 v->type = V4L2_TUNER_RADIO;
206 v->rangelow = (87.5*16000);
207 v->rangehigh = (108*16000);
208 v->rxsubchans = V4L2_TUNER_SUB_MONO;
209 v->capability = V4L2_TUNER_CAP_LOW;
210 v->audmode = V4L2_TUNER_MODE_MONO;
211 v->signal = 0xFFFF; /* We can't get the signal strength */
215 static int vidioc_s_tuner(struct file *file, void *priv,
216 struct v4l2_tuner *v)
224 static int vidioc_s_frequency(struct file *file, void *priv,
225 struct v4l2_frequency *f)
227 struct video_device *dev = video_devdata(file);
228 struct typhoon_device *typhoon = dev->priv;
230 typhoon->curfreq = f->frequency;
231 typhoon_setfreq(typhoon, typhoon->curfreq);
235 static int vidioc_g_frequency(struct file *file, void *priv,
236 struct v4l2_frequency *f)
238 struct video_device *dev = video_devdata(file);
239 struct typhoon_device *typhoon = dev->priv;
241 f->type = V4L2_TUNER_RADIO;
242 f->frequency = typhoon->curfreq;
247 static int vidioc_queryctrl(struct file *file, void *priv,
248 struct v4l2_queryctrl *qc)
252 for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
253 if (qc->id && qc->id == radio_qctrl[i].id) {
254 memcpy(qc, &(radio_qctrl[i]),
262 static int vidioc_g_ctrl(struct file *file, void *priv,
263 struct v4l2_control *ctrl)
265 struct video_device *dev = video_devdata(file);
266 struct typhoon_device *typhoon = dev->priv;
269 case V4L2_CID_AUDIO_MUTE:
270 ctrl->value = typhoon->muted;
272 case V4L2_CID_AUDIO_VOLUME:
273 ctrl->value = typhoon->curvol;
279 static int vidioc_s_ctrl (struct file *file, void *priv,
280 struct v4l2_control *ctrl)
282 struct video_device *dev = video_devdata(file);
283 struct typhoon_device *typhoon = dev->priv;
286 case V4L2_CID_AUDIO_MUTE:
288 typhoon_mute(typhoon);
290 typhoon_unmute(typhoon);
292 case V4L2_CID_AUDIO_VOLUME:
293 typhoon_setvol(typhoon, ctrl->value);
299 static int vidioc_g_audio(struct file *file, void *priv,
300 struct v4l2_audio *a)
305 strcpy(a->name, "Radio");
306 a->capability = V4L2_AUDCAP_STEREO;
310 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
316 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
323 static int vidioc_s_audio(struct file *file, void *priv,
324 struct v4l2_audio *a)
331 static struct typhoon_device typhoon_unit =
333 .iobase = CONFIG_RADIO_TYPHOON_PORT,
334 .curfreq = CONFIG_RADIO_TYPHOON_MUTEFREQ,
335 .mutefreq = CONFIG_RADIO_TYPHOON_MUTEFREQ,
338 static const struct file_operations typhoon_fops = {
339 .owner = THIS_MODULE,
340 .open = video_exclusive_open,
341 .release = video_exclusive_release,
342 .ioctl = video_ioctl2,
343 .compat_ioctl = v4l_compat_ioctl32,
347 static struct video_device typhoon_radio =
349 .owner = THIS_MODULE,
350 .name = "Typhoon Radio",
351 .type = VID_TYPE_TUNER,
352 .fops = &typhoon_fops,
353 .vidioc_querycap = vidioc_querycap,
354 .vidioc_g_tuner = vidioc_g_tuner,
355 .vidioc_s_tuner = vidioc_s_tuner,
356 .vidioc_g_audio = vidioc_g_audio,
357 .vidioc_s_audio = vidioc_s_audio,
358 .vidioc_g_input = vidioc_g_input,
359 .vidioc_s_input = vidioc_s_input,
360 .vidioc_g_frequency = vidioc_g_frequency,
361 .vidioc_s_frequency = vidioc_s_frequency,
362 .vidioc_queryctrl = vidioc_queryctrl,
363 .vidioc_g_ctrl = vidioc_g_ctrl,
364 .vidioc_s_ctrl = vidioc_s_ctrl,
367 #ifdef CONFIG_RADIO_TYPHOON_PROC_FS
369 static int typhoon_get_info(char *buf, char **start, off_t offset, int len)
374 #define MODULEPROCSTRING "Driver loaded as a module"
376 #define MODULEPROCSTRING "Driver compiled into kernel"
379 /* output must be kept under PAGE_SIZE */
380 out += sprintf(out, BANNER);
381 out += sprintf(out, "Load type: " MODULEPROCSTRING "\n\n");
382 out += sprintf(out, "frequency = %lu kHz\n",
383 typhoon_unit.curfreq >> 4);
384 out += sprintf(out, "volume = %d\n", typhoon_unit.curvol);
385 out += sprintf(out, "mute = %s\n", typhoon_unit.muted ?
387 out += sprintf(out, "iobase = 0x%x\n", typhoon_unit.iobase);
388 out += sprintf(out, "mute frequency = %lu kHz\n",
389 typhoon_unit.mutefreq >> 4);
393 #endif /* CONFIG_RADIO_TYPHOON_PROC_FS */
395 MODULE_AUTHOR("Dr. Henrik Seidel");
396 MODULE_DESCRIPTION("A driver for the Typhoon radio card (a.k.a. EcoRadio).");
397 MODULE_LICENSE("GPL");
400 static int radio_nr = -1;
402 module_param(io, int, 0);
403 MODULE_PARM_DESC(io, "I/O address of the Typhoon card (0x316 or 0x336)");
404 module_param(radio_nr, int, 0);
407 static unsigned long mutefreq = 0;
408 module_param(mutefreq, ulong, 0);
409 MODULE_PARM_DESC(mutefreq, "Frequency used when muting the card (in kHz)");
412 static int __init typhoon_init(void)
416 printk(KERN_ERR "radio-typhoon: You must set an I/O address with io=0x316 or io=0x336\n");
419 typhoon_unit.iobase = io;
421 if (mutefreq < 87000 || mutefreq > 108500) {
422 printk(KERN_ERR "radio-typhoon: You must set a frequency (in kHz) used when muting the card,\n");
423 printk(KERN_ERR "radio-typhoon: e.g. with \"mutefreq=87500\" (87000 <= mutefreq <= 108500)\n");
426 typhoon_unit.mutefreq = mutefreq;
429 printk(KERN_INFO BANNER);
430 mutex_init(&typhoon_unit.lock);
431 io = typhoon_unit.iobase;
432 if (!request_region(io, 8, "typhoon")) {
433 printk(KERN_ERR "radio-typhoon: port 0x%x already in use\n",
434 typhoon_unit.iobase);
438 typhoon_radio.priv = &typhoon_unit;
439 if (video_register_device(&typhoon_radio, VFL_TYPE_RADIO, radio_nr) == -1)
441 release_region(io, 8);
444 printk(KERN_INFO "radio-typhoon: port 0x%x.\n", typhoon_unit.iobase);
445 printk(KERN_INFO "radio-typhoon: mute frequency is %lu kHz.\n",
446 typhoon_unit.mutefreq);
447 typhoon_unit.mutefreq <<= 4;
449 /* mute card - prevents noisy bootups */
450 typhoon_mute(&typhoon_unit);
452 #ifdef CONFIG_RADIO_TYPHOON_PROC_FS
453 if (!create_proc_info_entry("driver/radio-typhoon", 0, NULL,
455 printk(KERN_ERR "radio-typhoon: registering /proc/driver/radio-typhoon failed\n");
461 static void __exit typhoon_cleanup_module(void)
464 #ifdef CONFIG_RADIO_TYPHOON_PROC_FS
465 remove_proc_entry("driver/radio-typhoon", NULL);
468 video_unregister_device(&typhoon_radio);
469 release_region(io, 8);
472 module_init(typhoon_init);
473 module_exit(typhoon_cleanup_module);