radio-rtrack2.c revision bec43661b1dc0075b7445223ba775674133b164d 
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 <asm/io.h>		/* outb, outb_p			*/
17#include <asm/uaccess.h>	/* copy to/from user		*/
18#include <linux/videodev2.h>	/* kernel radio structs		*/
19#include <media/v4l2-common.h>
20#include <media/v4l2-ioctl.h>
21#include <linux/spinlock.h>
22
23#include <linux/version.h>      /* for KERNEL_VERSION MACRO     */
24#define RADIO_VERSION KERNEL_VERSION(0,0,2)
25
26static struct v4l2_queryctrl radio_qctrl[] = {
27	{
28		.id            = V4L2_CID_AUDIO_MUTE,
29		.name          = "Mute",
30		.minimum       = 0,
31		.maximum       = 1,
32		.default_value = 1,
33		.type          = V4L2_CTRL_TYPE_BOOLEAN,
34	},{
35		.id            = V4L2_CID_AUDIO_VOLUME,
36		.name          = "Volume",
37		.minimum       = 0,
38		.maximum       = 65535,
39		.step          = 65535,
40		.default_value = 0xff,
41		.type          = V4L2_CTRL_TYPE_INTEGER,
42	}
43};
44
45#ifndef CONFIG_RADIO_RTRACK2_PORT
46#define CONFIG_RADIO_RTRACK2_PORT -1
47#endif
48
49static int io = CONFIG_RADIO_RTRACK2_PORT;
50static int radio_nr = -1;
51static spinlock_t lock;
52
53struct rt_device
54{
55	unsigned long in_use;
56	int port;
57	unsigned long curfreq;
58	int muted;
59};
60
61
62/* local things */
63
64static void rt_mute(struct rt_device *dev)
65{
66	if(dev->muted)
67		return;
68	spin_lock(&lock);
69	outb(1, io);
70	spin_unlock(&lock);
71	dev->muted = 1;
72}
73
74static void rt_unmute(struct rt_device *dev)
75{
76	if(dev->muted == 0)
77		return;
78	spin_lock(&lock);
79	outb(0, io);
80	spin_unlock(&lock);
81	dev->muted = 0;
82}
83
84static void zero(void)
85{
86	outb_p(1, io);
87	outb_p(3, io);
88	outb_p(1, io);
89}
90
91static void one(void)
92{
93	outb_p(5, io);
94	outb_p(7, io);
95	outb_p(5, io);
96}
97
98static int rt_setfreq(struct rt_device *dev, unsigned long freq)
99{
100	int i;
101
102	freq = freq / 200 + 856;
103
104	spin_lock(&lock);
105
106	outb_p(0xc8, io);
107	outb_p(0xc9, io);
108	outb_p(0xc9, io);
109
110	for (i = 0; i < 10; i++)
111		zero ();
112
113	for (i = 14; i >= 0; i--)
114		if (freq & (1 << i))
115			one ();
116		else
117			zero ();
118
119	outb_p(0xc8, io);
120	if (!dev->muted)
121		outb_p(0, io);
122
123	spin_unlock(&lock);
124	return 0;
125}
126
127static int vidioc_querycap(struct file *file, void *priv,
128				struct v4l2_capability *v)
129{
130	strlcpy(v->driver, "radio-rtrack2", sizeof(v->driver));
131	strlcpy(v->card, "RadioTrack II", sizeof(v->card));
132	sprintf(v->bus_info, "ISA");
133	v->version = RADIO_VERSION;
134	v->capabilities = V4L2_CAP_TUNER;
135	return 0;
136}
137
138static int vidioc_s_tuner(struct file *file, void *priv,
139				struct v4l2_tuner *v)
140{
141	if (v->index > 0)
142		return -EINVAL;
143
144	return 0;
145}
146
147static int rt_getsigstr(struct rt_device *dev)
148{
149	if (inb(io) & 2)	/* bit set = no signal present	*/
150		return 0;
151	return 1;		/* signal present		*/
152}
153
154static int vidioc_g_tuner(struct file *file, void *priv,
155				struct v4l2_tuner *v)
156{
157	struct rt_device *rt = video_drvdata(file);
158
159	if (v->index > 0)
160		return -EINVAL;
161
162	strcpy(v->name, "FM");
163	v->type = V4L2_TUNER_RADIO;
164	v->rangelow = (88*16000);
165	v->rangehigh = (108*16000);
166	v->rxsubchans = V4L2_TUNER_SUB_MONO;
167	v->capability = V4L2_TUNER_CAP_LOW;
168	v->audmode = V4L2_TUNER_MODE_MONO;
169	v->signal = 0xFFFF*rt_getsigstr(rt);
170	return 0;
171}
172
173static int vidioc_s_frequency(struct file *file, void *priv,
174				struct v4l2_frequency *f)
175{
176	struct rt_device *rt = video_drvdata(file);
177
178	rt->curfreq = f->frequency;
179	rt_setfreq(rt, rt->curfreq);
180	return 0;
181}
182
183static int vidioc_g_frequency(struct file *file, void *priv,
184				struct v4l2_frequency *f)
185{
186	struct rt_device *rt = video_drvdata(file);
187
188	f->type = V4L2_TUNER_RADIO;
189	f->frequency = rt->curfreq;
190	return 0;
191}
192
193static int vidioc_queryctrl(struct file *file, void *priv,
194				struct v4l2_queryctrl *qc)
195{
196	int i;
197
198	for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
199		if (qc->id && qc->id == radio_qctrl[i].id) {
200			memcpy(qc, &(radio_qctrl[i]),
201						sizeof(*qc));
202			return 0;
203		}
204	}
205	return -EINVAL;
206}
207
208static int vidioc_g_ctrl(struct file *file, void *priv,
209				struct v4l2_control *ctrl)
210{
211	struct rt_device *rt = video_drvdata(file);
212
213	switch (ctrl->id) {
214	case V4L2_CID_AUDIO_MUTE:
215		ctrl->value = rt->muted;
216		return 0;
217	case V4L2_CID_AUDIO_VOLUME:
218		if (rt->muted)
219			ctrl->value = 0;
220		else
221			ctrl->value = 65535;
222		return 0;
223	}
224	return -EINVAL;
225}
226
227static int vidioc_s_ctrl(struct file *file, void *priv,
228				struct v4l2_control *ctrl)
229{
230	struct rt_device *rt = video_drvdata(file);
231
232	switch (ctrl->id) {
233	case V4L2_CID_AUDIO_MUTE:
234		if (ctrl->value)
235			rt_mute(rt);
236		else
237			rt_unmute(rt);
238		return 0;
239	case V4L2_CID_AUDIO_VOLUME:
240		if (ctrl->value)
241			rt_unmute(rt);
242		else
243			rt_mute(rt);
244		return 0;
245	}
246	return -EINVAL;
247}
248
249static int vidioc_g_audio(struct file *file, void *priv,
250				struct v4l2_audio *a)
251{
252	if (a->index > 1)
253		return -EINVAL;
254
255	strcpy(a->name, "Radio");
256	a->capability = V4L2_AUDCAP_STEREO;
257	return 0;
258}
259
260static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
261{
262	*i = 0;
263	return 0;
264}
265
266static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
267{
268	if (i != 0)
269		return -EINVAL;
270	return 0;
271}
272
273static int vidioc_s_audio(struct file *file, void *priv,
274				struct v4l2_audio *a)
275{
276	if (a->index != 0)
277		return -EINVAL;
278	return 0;
279}
280
281static struct rt_device rtrack2_unit;
282
283static int rtrack2_exclusive_open(struct file *file)
284{
285	return test_and_set_bit(0, &rtrack2_unit.in_use) ? -EBUSY : 0;
286}
287
288static int rtrack2_exclusive_release(struct file *file)
289{
290	clear_bit(0, &rtrack2_unit.in_use);
291	return 0;
292}
293
294static const struct v4l2_file_operations rtrack2_fops = {
295	.owner		= THIS_MODULE,
296	.open           = rtrack2_exclusive_open,
297	.release        = rtrack2_exclusive_release,
298	.ioctl		= video_ioctl2,
299};
300
301static const struct v4l2_ioctl_ops rtrack2_ioctl_ops = {
302	.vidioc_querycap    = vidioc_querycap,
303	.vidioc_g_tuner     = vidioc_g_tuner,
304	.vidioc_s_tuner     = vidioc_s_tuner,
305	.vidioc_g_frequency = vidioc_g_frequency,
306	.vidioc_s_frequency = vidioc_s_frequency,
307	.vidioc_queryctrl   = vidioc_queryctrl,
308	.vidioc_g_ctrl      = vidioc_g_ctrl,
309	.vidioc_s_ctrl      = vidioc_s_ctrl,
310	.vidioc_g_audio     = vidioc_g_audio,
311	.vidioc_s_audio     = vidioc_s_audio,
312	.vidioc_g_input     = vidioc_g_input,
313	.vidioc_s_input     = vidioc_s_input,
314};
315
316static struct video_device rtrack2_radio = {
317	.name		= "RadioTrack II radio",
318	.fops           = &rtrack2_fops,
319	.ioctl_ops 	= &rtrack2_ioctl_ops,
320	.release	= video_device_release_empty,
321};
322
323static int __init rtrack2_init(void)
324{
325	if(io==-1)
326	{
327		printk(KERN_ERR "You must set an I/O address with io=0x20c or io=0x30c\n");
328		return -EINVAL;
329	}
330	if (!request_region(io, 4, "rtrack2"))
331	{
332		printk(KERN_ERR "rtrack2: port 0x%x already in use\n", io);
333		return -EBUSY;
334	}
335
336	video_set_drvdata(&rtrack2_radio, &rtrack2_unit);
337
338	spin_lock_init(&lock);
339	if (video_register_device(&rtrack2_radio, VFL_TYPE_RADIO, radio_nr) < 0) {
340		release_region(io, 4);
341		return -EINVAL;
342	}
343
344	printk(KERN_INFO "AIMSlab Radiotrack II card driver.\n");
345
346	/* mute card - prevents noisy bootups */
347	outb(1, io);
348	rtrack2_unit.muted = 1;
349
350	return 0;
351}
352
353MODULE_AUTHOR("Ben Pfaff");
354MODULE_DESCRIPTION("A driver for the RadioTrack II radio card.");
355MODULE_LICENSE("GPL");
356
357module_param(io, int, 0);
358MODULE_PARM_DESC(io, "I/O address of the RadioTrack card (0x20c or 0x30c)");
359module_param(radio_nr, int, 0);
360
361static void __exit rtrack2_cleanup_module(void)
362{
363	video_unregister_device(&rtrack2_radio);
364	release_region(io,4);
365}
366
367module_init(rtrack2_init);
368module_exit(rtrack2_cleanup_module);
369
370/*
371  Local variables:
372  compile-command: "mmake"
373  End:
374*/
375