radio-rtrack2.c revision 7d7b4b635298fcf4c205a89486eb5f397c130f5b 
1/* RadioTrack II driver for Linux radio support (C) 1998 Ben Pfaff
2 *
3 * Based on RadioTrack I/RadioReveal (C) 1997 M. Kirkwood
4 * Converted to new API by Alan Cox <alan@lxorguk.ukuu.org.uk>
5 * Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org>
6 *
7 * TODO: Allow for more than one of these foolish entities :-)
8 *
9 * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
10 */
11
12#include <linux/module.h>	/* Modules 			*/
13#include <linux/init.h>		/* Initdata			*/
14#include <linux/ioport.h>	/* request_region		*/
15#include <linux/delay.h>	/* udelay			*/
16#include <linux/videodev2.h>	/* kernel radio structs		*/
17#include <linux/mutex.h>
18#include <linux/version.h>      /* for KERNEL_VERSION MACRO     */
19#include <linux/io.h>		/* outb, outb_p			*/
20#include <linux/uaccess.h>	/* copy to/from user		*/
21#include <media/v4l2-device.h>
22#include <media/v4l2-ioctl.h>
23
24MODULE_AUTHOR("Ben Pfaff");
25MODULE_DESCRIPTION("A driver for the RadioTrack II radio card.");
26MODULE_LICENSE("GPL");
27
28#ifndef CONFIG_RADIO_RTRACK2_PORT
29#define CONFIG_RADIO_RTRACK2_PORT -1
30#endif
31
32static int io = CONFIG_RADIO_RTRACK2_PORT;
33static int radio_nr = -1;
34
35module_param(io, int, 0);
36MODULE_PARM_DESC(io, "I/O address of the RadioTrack card (0x20c or 0x30c)");
37module_param(radio_nr, int, 0);
38
39#define RADIO_VERSION KERNEL_VERSION(0, 0, 2)
40
41struct rtrack2
42{
43	struct v4l2_device v4l2_dev;
44	struct video_device vdev;
45	int io;
46	unsigned long curfreq;
47	int muted;
48	struct mutex lock;
49};
50
51static struct rtrack2 rtrack2_card;
52
53
54/* local things */
55
56static void rt_mute(struct rtrack2 *dev)
57{
58	if (dev->muted)
59		return;
60	mutex_lock(&dev->lock);
61	outb(1, dev->io);
62	mutex_unlock(&dev->lock);
63	dev->muted = 1;
64}
65
66static void rt_unmute(struct rtrack2 *dev)
67{
68	if(dev->muted == 0)
69		return;
70	mutex_lock(&dev->lock);
71	outb(0, dev->io);
72	mutex_unlock(&dev->lock);
73	dev->muted = 0;
74}
75
76static void zero(struct rtrack2 *dev)
77{
78	outb_p(1, dev->io);
79	outb_p(3, dev->io);
80	outb_p(1, dev->io);
81}
82
83static void one(struct rtrack2 *dev)
84{
85	outb_p(5, dev->io);
86	outb_p(7, dev->io);
87	outb_p(5, dev->io);
88}
89
90static int rt_setfreq(struct rtrack2 *dev, unsigned long freq)
91{
92	int i;
93
94	mutex_lock(&dev->lock);
95	dev->curfreq = freq;
96	freq = freq / 200 + 856;
97
98	outb_p(0xc8, dev->io);
99	outb_p(0xc9, dev->io);
100	outb_p(0xc9, dev->io);
101
102	for (i = 0; i < 10; i++)
103		zero(dev);
104
105	for (i = 14; i >= 0; i--)
106		if (freq & (1 << i))
107			one(dev);
108		else
109			zero(dev);
110
111	outb_p(0xc8, dev->io);
112	if (!dev->muted)
113		outb_p(0, dev->io);
114
115	mutex_unlock(&dev->lock);
116	return 0;
117}
118
119static int vidioc_querycap(struct file *file, void *priv,
120				struct v4l2_capability *v)
121{
122	strlcpy(v->driver, "radio-rtrack2", sizeof(v->driver));
123	strlcpy(v->card, "RadioTrack II", sizeof(v->card));
124	strlcpy(v->bus_info, "ISA", sizeof(v->bus_info));
125	v->version = RADIO_VERSION;
126	v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
127	return 0;
128}
129
130static int vidioc_s_tuner(struct file *file, void *priv,
131				struct v4l2_tuner *v)
132{
133	return v->index ? -EINVAL : 0;
134}
135
136static int rt_getsigstr(struct rtrack2 *dev)
137{
138	int sig = 1;
139
140	mutex_lock(&dev->lock);
141	if (inb(dev->io) & 2)	/* bit set = no signal present	*/
142		sig = 0;
143	mutex_unlock(&dev->lock);
144	return sig;
145}
146
147static int vidioc_g_tuner(struct file *file, void *priv,
148				struct v4l2_tuner *v)
149{
150	struct rtrack2 *rt = video_drvdata(file);
151
152	if (v->index > 0)
153		return -EINVAL;
154
155	strlcpy(v->name, "FM", sizeof(v->name));
156	v->type = V4L2_TUNER_RADIO;
157	v->rangelow = 88 * 16000;
158	v->rangehigh = 108 * 16000;
159	v->rxsubchans = V4L2_TUNER_SUB_MONO;
160	v->capability = V4L2_TUNER_CAP_LOW;
161	v->audmode = V4L2_TUNER_MODE_MONO;
162	v->signal = 0xFFFF * rt_getsigstr(rt);
163	return 0;
164}
165
166static int vidioc_s_frequency(struct file *file, void *priv,
167				struct v4l2_frequency *f)
168{
169	struct rtrack2 *rt = video_drvdata(file);
170
171	rt_setfreq(rt, f->frequency);
172	return 0;
173}
174
175static int vidioc_g_frequency(struct file *file, void *priv,
176				struct v4l2_frequency *f)
177{
178	struct rtrack2 *rt = video_drvdata(file);
179
180	f->type = V4L2_TUNER_RADIO;
181	f->frequency = rt->curfreq;
182	return 0;
183}
184
185static int vidioc_queryctrl(struct file *file, void *priv,
186				struct v4l2_queryctrl *qc)
187{
188	switch (qc->id) {
189	case V4L2_CID_AUDIO_MUTE:
190		return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
191	case V4L2_CID_AUDIO_VOLUME:
192		return v4l2_ctrl_query_fill(qc, 0, 65535, 65535, 65535);
193	}
194	return -EINVAL;
195}
196
197static int vidioc_g_ctrl(struct file *file, void *priv,
198				struct v4l2_control *ctrl)
199{
200	struct rtrack2 *rt = video_drvdata(file);
201
202	switch (ctrl->id) {
203	case V4L2_CID_AUDIO_MUTE:
204		ctrl->value = rt->muted;
205		return 0;
206	case V4L2_CID_AUDIO_VOLUME:
207		if (rt->muted)
208			ctrl->value = 0;
209		else
210			ctrl->value = 65535;
211		return 0;
212	}
213	return -EINVAL;
214}
215
216static int vidioc_s_ctrl(struct file *file, void *priv,
217				struct v4l2_control *ctrl)
218{
219	struct rtrack2 *rt = video_drvdata(file);
220
221	switch (ctrl->id) {
222	case V4L2_CID_AUDIO_MUTE:
223		if (ctrl->value)
224			rt_mute(rt);
225		else
226			rt_unmute(rt);
227		return 0;
228	case V4L2_CID_AUDIO_VOLUME:
229		if (ctrl->value)
230			rt_unmute(rt);
231		else
232			rt_mute(rt);
233		return 0;
234	}
235	return -EINVAL;
236}
237
238static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
239{
240	*i = 0;
241	return 0;
242}
243
244static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
245{
246	return i ? -EINVAL : 0;
247}
248
249static int vidioc_g_audio(struct file *file, void *priv,
250				struct v4l2_audio *a)
251{
252	a->index = 0;
253	strlcpy(a->name, "Radio", sizeof(a->name));
254	a->capability = V4L2_AUDCAP_STEREO;
255	return 0;
256}
257
258static int vidioc_s_audio(struct file *file, void *priv,
259				struct v4l2_audio *a)
260{
261	return a->index ? -EINVAL : 0;
262}
263
264static int rtrack2_open(struct file *file)
265{
266	return 0;
267}
268
269static int rtrack2_release(struct file *file)
270{
271	return 0;
272}
273
274static const struct v4l2_file_operations rtrack2_fops = {
275	.owner		= THIS_MODULE,
276	.open           = rtrack2_open,
277	.release        = rtrack2_release,
278	.ioctl		= video_ioctl2,
279};
280
281static const struct v4l2_ioctl_ops rtrack2_ioctl_ops = {
282	.vidioc_querycap    = vidioc_querycap,
283	.vidioc_g_tuner     = vidioc_g_tuner,
284	.vidioc_s_tuner     = vidioc_s_tuner,
285	.vidioc_g_frequency = vidioc_g_frequency,
286	.vidioc_s_frequency = vidioc_s_frequency,
287	.vidioc_queryctrl   = vidioc_queryctrl,
288	.vidioc_g_ctrl      = vidioc_g_ctrl,
289	.vidioc_s_ctrl      = vidioc_s_ctrl,
290	.vidioc_g_audio     = vidioc_g_audio,
291	.vidioc_s_audio     = vidioc_s_audio,
292	.vidioc_g_input     = vidioc_g_input,
293	.vidioc_s_input     = vidioc_s_input,
294};
295
296static int __init rtrack2_init(void)
297{
298	struct rtrack2 *dev = &rtrack2_card;
299	struct v4l2_device *v4l2_dev = &dev->v4l2_dev;
300	int res;
301
302	strlcpy(v4l2_dev->name, "rtrack2", sizeof(v4l2_dev->name));
303	dev->io = io;
304	if (dev->io == -1) {
305		v4l2_err(v4l2_dev, "You must set an I/O address with io=0x20c or io=0x30c\n");
306		return -EINVAL;
307	}
308	if (!request_region(dev->io, 4, "rtrack2")) {
309		v4l2_err(v4l2_dev, "port 0x%x already in use\n", dev->io);
310		return -EBUSY;
311	}
312
313	res = v4l2_device_register(NULL, v4l2_dev);
314	if (res < 0) {
315		release_region(dev->io, 4);
316		v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
317		return res;
318	}
319
320	strlcpy(dev->vdev.name, v4l2_dev->name, sizeof(dev->vdev.name));
321	dev->vdev.v4l2_dev = v4l2_dev;
322	dev->vdev.fops = &rtrack2_fops;
323	dev->vdev.ioctl_ops = &rtrack2_ioctl_ops;
324	dev->vdev.release = video_device_release_empty;
325	video_set_drvdata(&dev->vdev, dev);
326
327	mutex_init(&dev->lock);
328	if (video_register_device(&dev->vdev, VFL_TYPE_RADIO, radio_nr) < 0) {
329		v4l2_device_unregister(v4l2_dev);
330		release_region(dev->io, 4);
331		return -EINVAL;
332	}
333
334	v4l2_info(v4l2_dev, "AIMSlab Radiotrack II card driver.\n");
335
336	/* mute card - prevents noisy bootups */
337	outb(1, dev->io);
338	dev->muted = 1;
339
340	return 0;
341}
342
343static void __exit rtrack2_exit(void)
344{
345	struct rtrack2 *dev = &rtrack2_card;
346
347	video_unregister_device(&dev->vdev);
348	v4l2_device_unregister(&dev->v4l2_dev);
349	release_region(dev->io, 4);
350}
351
352module_init(rtrack2_init);
353module_exit(rtrack2_exit);
354