radio-rtrack2.c revision 3ca685aae04960eaa8b2c97baf384996c20cf9ac 
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.Cox@linux.org>
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 video_device *dev = video_devdata(file);
158	struct rt_device *rt = dev->priv;
159
160	if (v->index > 0)
161		return -EINVAL;
162
163	strcpy(v->name, "FM");
164	v->type = V4L2_TUNER_RADIO;
165	v->rangelow = (88*16000);
166	v->rangehigh = (108*16000);
167	v->rxsubchans = V4L2_TUNER_SUB_MONO;
168	v->capability = V4L2_TUNER_CAP_LOW;
169	v->audmode = V4L2_TUNER_MODE_MONO;
170	v->signal = 0xFFFF*rt_getsigstr(rt);
171	return 0;
172}
173
174static int vidioc_s_frequency(struct file *file, void *priv,
175				struct v4l2_frequency *f)
176{
177	struct video_device *dev = video_devdata(file);
178	struct rt_device *rt = dev->priv;
179
180	rt->curfreq = f->frequency;
181	rt_setfreq(rt, rt->curfreq);
182	return 0;
183}
184
185static int vidioc_g_frequency(struct file *file, void *priv,
186				struct v4l2_frequency *f)
187{
188	struct video_device *dev = video_devdata(file);
189	struct rt_device *rt = dev->priv;
190
191	f->type = V4L2_TUNER_RADIO;
192	f->frequency = rt->curfreq;
193	return 0;
194}
195
196static int vidioc_queryctrl(struct file *file, void *priv,
197				struct v4l2_queryctrl *qc)
198{
199	int i;
200
201	for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
202		if (qc->id && qc->id == radio_qctrl[i].id) {
203			memcpy(qc, &(radio_qctrl[i]),
204						sizeof(*qc));
205			return 0;
206		}
207	}
208	return -EINVAL;
209}
210
211static int vidioc_g_ctrl(struct file *file, void *priv,
212				struct v4l2_control *ctrl)
213{
214	struct video_device *dev = video_devdata(file);
215	struct rt_device *rt = dev->priv;
216
217	switch (ctrl->id) {
218	case V4L2_CID_AUDIO_MUTE:
219		ctrl->value = rt->muted;
220		return 0;
221	case V4L2_CID_AUDIO_VOLUME:
222		if (rt->muted)
223			ctrl->value = 0;
224		else
225			ctrl->value = 65535;
226		return 0;
227	}
228	return -EINVAL;
229}
230
231static int vidioc_s_ctrl(struct file *file, void *priv,
232				struct v4l2_control *ctrl)
233{
234	struct video_device *dev = video_devdata(file);
235	struct rt_device *rt = dev->priv;
236
237	switch (ctrl->id) {
238	case V4L2_CID_AUDIO_MUTE:
239		if (ctrl->value)
240			rt_mute(rt);
241		else
242			rt_unmute(rt);
243		return 0;
244	case V4L2_CID_AUDIO_VOLUME:
245		if (ctrl->value)
246			rt_unmute(rt);
247		else
248			rt_mute(rt);
249		return 0;
250	}
251	return -EINVAL;
252}
253
254static int vidioc_g_audio(struct file *file, void *priv,
255				struct v4l2_audio *a)
256{
257	if (a->index > 1)
258		return -EINVAL;
259
260	strcpy(a->name, "Radio");
261	a->capability = V4L2_AUDCAP_STEREO;
262	return 0;
263}
264
265static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
266{
267	*i = 0;
268	return 0;
269}
270
271static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
272{
273	if (i != 0)
274		return -EINVAL;
275	return 0;
276}
277
278static int vidioc_s_audio(struct file *file, void *priv,
279				struct v4l2_audio *a)
280{
281	if (a->index != 0)
282		return -EINVAL;
283	return 0;
284}
285
286static struct rt_device rtrack2_unit;
287
288static int rtrack2_exclusive_open(struct inode *inode, struct file *file)
289{
290	return test_and_set_bit(0, &rtrack2_unit.in_use) ? -EBUSY : 0;
291}
292
293static int rtrack2_exclusive_release(struct inode *inode, struct file *file)
294{
295	clear_bit(0, &rtrack2_unit.in_use);
296	return 0;
297}
298
299static const struct file_operations rtrack2_fops = {
300	.owner		= THIS_MODULE,
301	.open           = rtrack2_exclusive_open,
302	.release        = rtrack2_exclusive_release,
303	.ioctl		= video_ioctl2,
304#ifdef CONFIG_COMPAT
305	.compat_ioctl	= v4l_compat_ioctl32,
306#endif
307	.llseek         = no_llseek,
308};
309
310static const struct v4l2_ioctl_ops rtrack2_ioctl_ops = {
311	.vidioc_querycap    = vidioc_querycap,
312	.vidioc_g_tuner     = vidioc_g_tuner,
313	.vidioc_s_tuner     = vidioc_s_tuner,
314	.vidioc_g_frequency = vidioc_g_frequency,
315	.vidioc_s_frequency = vidioc_s_frequency,
316	.vidioc_queryctrl   = vidioc_queryctrl,
317	.vidioc_g_ctrl      = vidioc_g_ctrl,
318	.vidioc_s_ctrl      = vidioc_s_ctrl,
319	.vidioc_g_audio     = vidioc_g_audio,
320	.vidioc_s_audio     = vidioc_s_audio,
321	.vidioc_g_input     = vidioc_g_input,
322	.vidioc_s_input     = vidioc_s_input,
323};
324
325static struct video_device rtrack2_radio = {
326	.name		= "RadioTrack II radio",
327	.fops           = &rtrack2_fops,
328	.ioctl_ops 	= &rtrack2_ioctl_ops,
329};
330
331static int __init rtrack2_init(void)
332{
333	if(io==-1)
334	{
335		printk(KERN_ERR "You must set an I/O address with io=0x20c or io=0x30c\n");
336		return -EINVAL;
337	}
338	if (!request_region(io, 4, "rtrack2"))
339	{
340		printk(KERN_ERR "rtrack2: port 0x%x already in use\n", io);
341		return -EBUSY;
342	}
343
344	rtrack2_radio.priv=&rtrack2_unit;
345
346	spin_lock_init(&lock);
347	if (video_register_device(&rtrack2_radio, VFL_TYPE_RADIO, radio_nr) < 0) {
348		release_region(io, 4);
349		return -EINVAL;
350	}
351
352	printk(KERN_INFO "AIMSlab Radiotrack II card driver.\n");
353
354	/* mute card - prevents noisy bootups */
355	outb(1, io);
356	rtrack2_unit.muted = 1;
357
358	return 0;
359}
360
361MODULE_AUTHOR("Ben Pfaff");
362MODULE_DESCRIPTION("A driver for the RadioTrack II radio card.");
363MODULE_LICENSE("GPL");
364
365module_param(io, int, 0);
366MODULE_PARM_DESC(io, "I/O address of the RadioTrack card (0x20c or 0x30c)");
367module_param(radio_nr, int, 0);
368
369static void __exit rtrack2_cleanup_module(void)
370{
371	video_unregister_device(&rtrack2_radio);
372	release_region(io,4);
373}
374
375module_init(rtrack2_init);
376module_exit(rtrack2_cleanup_module);
377
378/*
379  Local variables:
380  compile-command: "mmake"
381  End:
382*/
383