radio-rtrack2.c revision ab84f5736086b84d99015cd82515a31b95e03f48 
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 <media/v4l2-device.h>
21#include <media/v4l2-ioctl.h>
22
23MODULE_AUTHOR("Ben Pfaff");
24MODULE_DESCRIPTION("A driver for the RadioTrack II radio card.");
25MODULE_LICENSE("GPL");
26
27#ifndef CONFIG_RADIO_RTRACK2_PORT
28#define CONFIG_RADIO_RTRACK2_PORT -1
29#endif
30
31static int io = CONFIG_RADIO_RTRACK2_PORT;
32static int radio_nr = -1;
33
34module_param(io, int, 0);
35MODULE_PARM_DESC(io, "I/O address of the RadioTrack card (0x20c or 0x30c)");
36module_param(radio_nr, int, 0);
37
38#define RADIO_VERSION KERNEL_VERSION(0, 0, 2)
39
40struct rtrack2
41{
42	struct v4l2_device v4l2_dev;
43	struct video_device vdev;
44	int io;
45	unsigned long curfreq;
46	int muted;
47	struct mutex lock;
48};
49
50static struct rtrack2 rtrack2_card;
51
52
53/* local things */
54
55static void rt_mute(struct rtrack2 *dev)
56{
57	if (dev->muted)
58		return;
59	mutex_lock(&dev->lock);
60	outb(1, dev->io);
61	mutex_unlock(&dev->lock);
62	dev->muted = 1;
63}
64
65static void rt_unmute(struct rtrack2 *dev)
66{
67	if(dev->muted == 0)
68		return;
69	mutex_lock(&dev->lock);
70	outb(0, dev->io);
71	mutex_unlock(&dev->lock);
72	dev->muted = 0;
73}
74
75static void zero(struct rtrack2 *dev)
76{
77	outb_p(1, dev->io);
78	outb_p(3, dev->io);
79	outb_p(1, dev->io);
80}
81
82static void one(struct rtrack2 *dev)
83{
84	outb_p(5, dev->io);
85	outb_p(7, dev->io);
86	outb_p(5, dev->io);
87}
88
89static int rt_setfreq(struct rtrack2 *dev, unsigned long freq)
90{
91	int i;
92
93	mutex_lock(&dev->lock);
94	dev->curfreq = freq;
95	freq = freq / 200 + 856;
96
97	outb_p(0xc8, dev->io);
98	outb_p(0xc9, dev->io);
99	outb_p(0xc9, dev->io);
100
101	for (i = 0; i < 10; i++)
102		zero(dev);
103
104	for (i = 14; i >= 0; i--)
105		if (freq & (1 << i))
106			one(dev);
107		else
108			zero(dev);
109
110	outb_p(0xc8, dev->io);
111	if (!dev->muted)
112		outb_p(0, dev->io);
113
114	mutex_unlock(&dev->lock);
115	return 0;
116}
117
118static int vidioc_querycap(struct file *file, void *priv,
119				struct v4l2_capability *v)
120{
121	strlcpy(v->driver, "radio-rtrack2", sizeof(v->driver));
122	strlcpy(v->card, "RadioTrack II", sizeof(v->card));
123	strlcpy(v->bus_info, "ISA", sizeof(v->bus_info));
124	v->version = RADIO_VERSION;
125	v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
126	return 0;
127}
128
129static int vidioc_s_tuner(struct file *file, void *priv,
130				struct v4l2_tuner *v)
131{
132	return v->index ? -EINVAL : 0;
133}
134
135static int rt_getsigstr(struct rtrack2 *dev)
136{
137	int sig = 1;
138
139	mutex_lock(&dev->lock);
140	if (inb(dev->io) & 2)	/* bit set = no signal present	*/
141		sig = 0;
142	mutex_unlock(&dev->lock);
143	return sig;
144}
145
146static int vidioc_g_tuner(struct file *file, void *priv,
147				struct v4l2_tuner *v)
148{
149	struct rtrack2 *rt = video_drvdata(file);
150
151	if (v->index > 0)
152		return -EINVAL;
153
154	strlcpy(v->name, "FM", sizeof(v->name));
155	v->type = V4L2_TUNER_RADIO;
156	v->rangelow = 88 * 16000;
157	v->rangehigh = 108 * 16000;
158	v->rxsubchans = V4L2_TUNER_SUB_MONO;
159	v->capability = V4L2_TUNER_CAP_LOW;
160	v->audmode = V4L2_TUNER_MODE_MONO;
161	v->signal = 0xFFFF * rt_getsigstr(rt);
162	return 0;
163}
164
165static int vidioc_s_frequency(struct file *file, void *priv,
166				struct v4l2_frequency *f)
167{
168	struct rtrack2 *rt = video_drvdata(file);
169
170	rt_setfreq(rt, f->frequency);
171	return 0;
172}
173
174static int vidioc_g_frequency(struct file *file, void *priv,
175				struct v4l2_frequency *f)
176{
177	struct rtrack2 *rt = video_drvdata(file);
178
179	f->type = V4L2_TUNER_RADIO;
180	f->frequency = rt->curfreq;
181	return 0;
182}
183
184static int vidioc_queryctrl(struct file *file, void *priv,
185				struct v4l2_queryctrl *qc)
186{
187	switch (qc->id) {
188	case V4L2_CID_AUDIO_MUTE:
189		return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
190	case V4L2_CID_AUDIO_VOLUME:
191		return v4l2_ctrl_query_fill(qc, 0, 65535, 65535, 65535);
192	}
193	return -EINVAL;
194}
195
196static int vidioc_g_ctrl(struct file *file, void *priv,
197				struct v4l2_control *ctrl)
198{
199	struct rtrack2 *rt = video_drvdata(file);
200
201	switch (ctrl->id) {
202	case V4L2_CID_AUDIO_MUTE:
203		ctrl->value = rt->muted;
204		return 0;
205	case V4L2_CID_AUDIO_VOLUME:
206		if (rt->muted)
207			ctrl->value = 0;
208		else
209			ctrl->value = 65535;
210		return 0;
211	}
212	return -EINVAL;
213}
214
215static int vidioc_s_ctrl(struct file *file, void *priv,
216				struct v4l2_control *ctrl)
217{
218	struct rtrack2 *rt = video_drvdata(file);
219
220	switch (ctrl->id) {
221	case V4L2_CID_AUDIO_MUTE:
222		if (ctrl->value)
223			rt_mute(rt);
224		else
225			rt_unmute(rt);
226		return 0;
227	case V4L2_CID_AUDIO_VOLUME:
228		if (ctrl->value)
229			rt_unmute(rt);
230		else
231			rt_mute(rt);
232		return 0;
233	}
234	return -EINVAL;
235}
236
237static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
238{
239	*i = 0;
240	return 0;
241}
242
243static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
244{
245	return i ? -EINVAL : 0;
246}
247
248static int vidioc_g_audio(struct file *file, void *priv,
249				struct v4l2_audio *a)
250{
251	a->index = 0;
252	strlcpy(a->name, "Radio", sizeof(a->name));
253	a->capability = V4L2_AUDCAP_STEREO;
254	return 0;
255}
256
257static int vidioc_s_audio(struct file *file, void *priv,
258				struct v4l2_audio *a)
259{
260	return a->index ? -EINVAL : 0;
261}
262
263static int rtrack2_open(struct file *file)
264{
265	return 0;
266}
267
268static int rtrack2_release(struct file *file)
269{
270	return 0;
271}
272
273static const struct v4l2_file_operations rtrack2_fops = {
274	.owner		= THIS_MODULE,
275	.open           = rtrack2_open,
276	.release        = rtrack2_release,
277	.ioctl		= video_ioctl2,
278};
279
280static const struct v4l2_ioctl_ops rtrack2_ioctl_ops = {
281	.vidioc_querycap    = vidioc_querycap,
282	.vidioc_g_tuner     = vidioc_g_tuner,
283	.vidioc_s_tuner     = vidioc_s_tuner,
284	.vidioc_g_frequency = vidioc_g_frequency,
285	.vidioc_s_frequency = vidioc_s_frequency,
286	.vidioc_queryctrl   = vidioc_queryctrl,
287	.vidioc_g_ctrl      = vidioc_g_ctrl,
288	.vidioc_s_ctrl      = vidioc_s_ctrl,
289	.vidioc_g_audio     = vidioc_g_audio,
290	.vidioc_s_audio     = vidioc_s_audio,
291	.vidioc_g_input     = vidioc_g_input,
292	.vidioc_s_input     = vidioc_s_input,
293};
294
295static int __init rtrack2_init(void)
296{
297	struct rtrack2 *dev = &rtrack2_card;
298	struct v4l2_device *v4l2_dev = &dev->v4l2_dev;
299	int res;
300
301	strlcpy(v4l2_dev->name, "rtrack2", sizeof(v4l2_dev->name));
302	dev->io = io;
303	if (dev->io == -1) {
304		v4l2_err(v4l2_dev, "You must set an I/O address with io=0x20c or io=0x30c\n");
305		return -EINVAL;
306	}
307	if (!request_region(dev->io, 4, "rtrack2")) {
308		v4l2_err(v4l2_dev, "port 0x%x already in use\n", dev->io);
309		return -EBUSY;
310	}
311
312	res = v4l2_device_register(NULL, v4l2_dev);
313	if (res < 0) {
314		release_region(dev->io, 4);
315		v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
316		return res;
317	}
318
319	strlcpy(dev->vdev.name, v4l2_dev->name, sizeof(dev->vdev.name));
320	dev->vdev.v4l2_dev = v4l2_dev;
321	dev->vdev.fops = &rtrack2_fops;
322	dev->vdev.ioctl_ops = &rtrack2_ioctl_ops;
323	dev->vdev.release = video_device_release_empty;
324	video_set_drvdata(&dev->vdev, dev);
325
326	mutex_init(&dev->lock);
327	if (video_register_device(&dev->vdev, VFL_TYPE_RADIO, radio_nr) < 0) {
328		v4l2_device_unregister(v4l2_dev);
329		release_region(dev->io, 4);
330		return -EINVAL;
331	}
332
333	v4l2_info(v4l2_dev, "AIMSlab Radiotrack II card driver.\n");
334
335	/* mute card - prevents noisy bootups */
336	outb(1, dev->io);
337	dev->muted = 1;
338
339	return 0;
340}
341
342static void __exit rtrack2_exit(void)
343{
344	struct rtrack2 *dev = &rtrack2_card;
345
346	video_unregister_device(&dev->vdev);
347	v4l2_device_unregister(&dev->v4l2_dev);
348	release_region(dev->io, 4);
349}
350
351module_init(rtrack2_init);
352module_exit(rtrack2_exit);
353