radio-rtrack2.c revision 0d0fbf8152fb3bb4393be11e8df7f70e1fbbd738 
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 */
10
11#include <linux/module.h>	/* Modules 			*/
12#include <linux/init.h>		/* Initdata			*/
13#include <linux/ioport.h>	/* request_region		*/
14#include <linux/delay.h>	/* udelay			*/
15#include <asm/io.h>		/* outb, outb_p			*/
16#include <asm/uaccess.h>	/* copy to/from user		*/
17#include <linux/videodev.h>	/* kernel radio structs		*/
18#include <linux/config.h>	/* CONFIG_RADIO_RTRACK2_PORT 	*/
19#include <linux/spinlock.h>
20
21#ifndef CONFIG_RADIO_RTRACK2_PORT
22#define CONFIG_RADIO_RTRACK2_PORT -1
23#endif
24
25static int io = CONFIG_RADIO_RTRACK2_PORT;
26static int radio_nr = -1;
27static spinlock_t lock;
28
29struct rt_device
30{
31	int port;
32	unsigned long curfreq;
33	int muted;
34};
35
36
37/* local things */
38
39static void rt_mute(struct rt_device *dev)
40{
41        if(dev->muted)
42		return;
43	spin_lock(&lock);
44	outb(1, io);
45	spin_unlock(&lock);
46	dev->muted = 1;
47}
48
49static void rt_unmute(struct rt_device *dev)
50{
51	if(dev->muted == 0)
52		return;
53	spin_lock(&lock);
54	outb(0, io);
55	spin_unlock(&lock);
56	dev->muted = 0;
57}
58
59static void zero(void)
60{
61        outb_p(1, io);
62	outb_p(3, io);
63	outb_p(1, io);
64}
65
66static void one(void)
67{
68        outb_p(5, io);
69	outb_p(7, io);
70	outb_p(5, io);
71}
72
73static int rt_setfreq(struct rt_device *dev, unsigned long freq)
74{
75	int i;
76
77	freq = freq / 200 + 856;
78
79	spin_lock(&lock);
80
81	outb_p(0xc8, io);
82	outb_p(0xc9, io);
83	outb_p(0xc9, io);
84
85	for (i = 0; i < 10; i++)
86		zero ();
87
88	for (i = 14; i >= 0; i--)
89		if (freq & (1 << i))
90			one ();
91		else
92			zero ();
93
94	outb_p(0xc8, io);
95	if (!dev->muted)
96		outb_p(0, io);
97
98	spin_unlock(&lock);
99	return 0;
100}
101
102static int rt_getsigstr(struct rt_device *dev)
103{
104	if (inb(io) & 2)	/* bit set = no signal present	*/
105		return 0;
106	return 1;		/* signal present		*/
107}
108
109static int rt_do_ioctl(struct inode *inode, struct file *file,
110		       unsigned int cmd, void *arg)
111{
112	struct video_device *dev = video_devdata(file);
113	struct rt_device *rt=dev->priv;
114
115	switch(cmd)
116	{
117		case VIDIOCGCAP:
118		{
119			struct video_capability *v = arg;
120			memset(v,0,sizeof(*v));
121			v->type=VID_TYPE_TUNER;
122			v->channels=1;
123			v->audios=1;
124			strcpy(v->name, "RadioTrack II");
125			return 0;
126		}
127		case VIDIOCGTUNER:
128		{
129			struct video_tuner *v = arg;
130			if(v->tuner)	/* Only 1 tuner */
131				return -EINVAL;
132			v->rangelow=88*16000;
133			v->rangehigh=108*16000;
134			v->flags=VIDEO_TUNER_LOW;
135			v->mode=VIDEO_MODE_AUTO;
136			v->signal=0xFFFF*rt_getsigstr(rt);
137			strcpy(v->name, "FM");
138			return 0;
139		}
140		case VIDIOCSTUNER:
141		{
142			struct video_tuner *v = arg;
143			if(v->tuner!=0)
144				return -EINVAL;
145			/* Only 1 tuner so no setting needed ! */
146			return 0;
147		}
148		case VIDIOCGFREQ:
149		{
150			unsigned long *freq = arg;
151			*freq = rt->curfreq;
152			return 0;
153		}
154		case VIDIOCSFREQ:
155		{
156			unsigned long *freq = arg;
157			rt->curfreq = *freq;
158			rt_setfreq(rt, rt->curfreq);
159			return 0;
160		}
161		case VIDIOCGAUDIO:
162		{
163			struct video_audio *v = arg;
164			memset(v,0, sizeof(*v));
165			v->flags|=VIDEO_AUDIO_MUTABLE;
166			v->volume=1;
167			v->step=65535;
168			strcpy(v->name, "Radio");
169			return 0;
170		}
171		case VIDIOCSAUDIO:
172		{
173			struct video_audio *v = arg;
174			if(v->audio)
175				return -EINVAL;
176
177			if(v->flags&VIDEO_AUDIO_MUTE)
178				rt_mute(rt);
179			else
180			        rt_unmute(rt);
181
182			return 0;
183		}
184		default:
185			return -ENOIOCTLCMD;
186	}
187}
188
189static int rt_ioctl(struct inode *inode, struct file *file,
190		    unsigned int cmd, unsigned long arg)
191{
192	return video_usercopy(inode, file, cmd, arg, rt_do_ioctl);
193}
194
195static struct rt_device rtrack2_unit;
196
197static struct file_operations rtrack2_fops = {
198	.owner		= THIS_MODULE,
199	.open           = video_exclusive_open,
200	.release        = video_exclusive_release,
201	.ioctl		= rt_ioctl,
202	.compat_ioctl	= v4l_compat_ioctl32,
203	.llseek         = no_llseek,
204};
205
206static struct video_device rtrack2_radio=
207{
208	.owner		= THIS_MODULE,
209	.name		= "RadioTrack II radio",
210	.type		= VID_TYPE_TUNER,
211	.hardware	= VID_HARDWARE_RTRACK2,
212	.fops           = &rtrack2_fops,
213};
214
215static int __init rtrack2_init(void)
216{
217	if(io==-1)
218	{
219		printk(KERN_ERR "You must set an I/O address with io=0x20c or io=0x30c\n");
220		return -EINVAL;
221	}
222	if (!request_region(io, 4, "rtrack2"))
223	{
224		printk(KERN_ERR "rtrack2: port 0x%x already in use\n", io);
225		return -EBUSY;
226	}
227
228	rtrack2_radio.priv=&rtrack2_unit;
229
230	spin_lock_init(&lock);
231	if(video_register_device(&rtrack2_radio, VFL_TYPE_RADIO, radio_nr)==-1)
232	{
233		release_region(io, 4);
234		return -EINVAL;
235	}
236
237	printk(KERN_INFO "AIMSlab Radiotrack II card driver.\n");
238
239 	/* mute card - prevents noisy bootups */
240	outb(1, io);
241	rtrack2_unit.muted = 1;
242
243	return 0;
244}
245
246MODULE_AUTHOR("Ben Pfaff");
247MODULE_DESCRIPTION("A driver for the RadioTrack II radio card.");
248MODULE_LICENSE("GPL");
249
250module_param(io, int, 0);
251MODULE_PARM_DESC(io, "I/O address of the RadioTrack card (0x20c or 0x30c)");
252module_param(radio_nr, int, 0);
253
254static void __exit rtrack2_cleanup_module(void)
255{
256	video_unregister_device(&rtrack2_radio);
257	release_region(io,4);
258}
259
260module_init(rtrack2_init);
261module_exit(rtrack2_cleanup_module);
262
263/*
264  Local variables:
265  compile-command: "mmake"
266  End:
267*/
268