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 <linux/spinlock.h>
21 
22 #include <linux/version.h>      /* for KERNEL_VERSION MACRO     */
23 #define RADIO_VERSION KERNEL_VERSION(0,0,2)
24 
25 static struct v4l2_queryctrl radio_qctrl[] = {
26 	{
27 		.id            = V4L2_CID_AUDIO_MUTE,
28 		.name          = "Mute",
29 		.minimum       = 0,
30 		.maximum       = 1,
31 		.default_value = 1,
32 		.type          = V4L2_CTRL_TYPE_BOOLEAN,
33 	},{
34 		.id            = V4L2_CID_AUDIO_VOLUME,
35 		.name          = "Volume",
36 		.minimum       = 0,
37 		.maximum       = 65535,
38 		.step          = 65535,
39 		.default_value = 0xff,
40 		.type          = V4L2_CTRL_TYPE_INTEGER,
41 	}
42 };
43 
44 #ifndef CONFIG_RADIO_RTRACK2_PORT
45 #define CONFIG_RADIO_RTRACK2_PORT -1
46 #endif
47 
48 static int io = CONFIG_RADIO_RTRACK2_PORT;
49 static int radio_nr = -1;
50 static spinlock_t lock;
51 
52 struct rt_device
53 {
54 	int port;
55 	unsigned long curfreq;
56 	int muted;
57 };
58 
59 
60 /* local things */
61 
62 static void rt_mute(struct rt_device *dev)
63 {
64 	if(dev->muted)
65 		return;
66 	spin_lock(&lock);
67 	outb(1, io);
68 	spin_unlock(&lock);
69 	dev->muted = 1;
70 }
71 
72 static void rt_unmute(struct rt_device *dev)
73 {
74 	if(dev->muted == 0)
75 		return;
76 	spin_lock(&lock);
77 	outb(0, io);
78 	spin_unlock(&lock);
79 	dev->muted = 0;
80 }
81 
82 static void zero(void)
83 {
84 	outb_p(1, io);
85 	outb_p(3, io);
86 	outb_p(1, io);
87 }
88 
89 static void one(void)
90 {
91 	outb_p(5, io);
92 	outb_p(7, io);
93 	outb_p(5, io);
94 }
95 
96 static int rt_setfreq(struct rt_device *dev, unsigned long freq)
97 {
98 	int i;
99 
100 	freq = freq / 200 + 856;
101 
102 	spin_lock(&lock);
103 
104 	outb_p(0xc8, io);
105 	outb_p(0xc9, io);
106 	outb_p(0xc9, io);
107 
108 	for (i = 0; i < 10; i++)
109 		zero ();
110 
111 	for (i = 14; i >= 0; i--)
112 		if (freq & (1 << i))
113 			one ();
114 		else
115 			zero ();
116 
117 	outb_p(0xc8, io);
118 	if (!dev->muted)
119 		outb_p(0, io);
120 
121 	spin_unlock(&lock);
122 	return 0;
123 }
124 
125 static int vidioc_querycap(struct file *file, void *priv,
126 				struct v4l2_capability *v)
127 {
128 	strlcpy(v->driver, "radio-rtrack2", sizeof(v->driver));
129 	strlcpy(v->card, "RadioTrack II", sizeof(v->card));
130 	sprintf(v->bus_info, "ISA");
131 	v->version = RADIO_VERSION;
132 	v->capabilities = V4L2_CAP_TUNER;
133 	return 0;
134 }
135 
136 static int vidioc_s_tuner(struct file *file, void *priv,
137 				struct v4l2_tuner *v)
138 {
139 	if (v->index > 0)
140 		return -EINVAL;
141 
142 	return 0;
143 }
144 
145 static int rt_getsigstr(struct rt_device *dev)
146 {
147 	if (inb(io) & 2)	/* bit set = no signal present	*/
148 		return 0;
149 	return 1;		/* signal present		*/
150 }
151 
152 static int vidioc_g_tuner(struct file *file, void *priv,
153 				struct v4l2_tuner *v)
154 {
155 	struct video_device *dev = video_devdata(file);
156 	struct rt_device *rt = dev->priv;
157 
158 	if (v->index > 0)
159 		return -EINVAL;
160 
161 	strcpy(v->name, "FM");
162 	v->type = V4L2_TUNER_RADIO;
163 	v->rangelow = (88*16000);
164 	v->rangehigh = (108*16000);
165 	v->rxsubchans = V4L2_TUNER_SUB_MONO;
166 	v->capability = V4L2_TUNER_CAP_LOW;
167 	v->audmode = V4L2_TUNER_MODE_MONO;
168 	v->signal = 0xFFFF*rt_getsigstr(rt);
169 	return 0;
170 }
171 
172 static int vidioc_s_frequency(struct file *file, void *priv,
173 				struct v4l2_frequency *f)
174 {
175 	struct video_device *dev = video_devdata(file);
176 	struct rt_device *rt = dev->priv;
177 
178 	rt->curfreq = f->frequency;
179 	rt_setfreq(rt, rt->curfreq);
180 	return 0;
181 }
182 
183 static int vidioc_g_frequency(struct file *file, void *priv,
184 				struct v4l2_frequency *f)
185 {
186 	struct video_device *dev = video_devdata(file);
187 	struct rt_device *rt = dev->priv;
188 
189 	f->type = V4L2_TUNER_RADIO;
190 	f->frequency = rt->curfreq;
191 	return 0;
192 }
193 
194 static int vidioc_queryctrl(struct file *file, void *priv,
195 				struct v4l2_queryctrl *qc)
196 {
197 	int i;
198 
199 	for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
200 		if (qc->id && qc->id == radio_qctrl[i].id) {
201 			memcpy(qc, &(radio_qctrl[i]),
202 						sizeof(*qc));
203 			return 0;
204 		}
205 	}
206 	return -EINVAL;
207 }
208 
209 static int vidioc_g_ctrl(struct file *file, void *priv,
210 				struct v4l2_control *ctrl)
211 {
212 	struct video_device *dev = video_devdata(file);
213 	struct rt_device *rt = dev->priv;
214 
215 	switch (ctrl->id) {
216 	case V4L2_CID_AUDIO_MUTE:
217 		ctrl->value = rt->muted;
218 		return 0;
219 	case V4L2_CID_AUDIO_VOLUME:
220 		if (rt->muted)
221 			ctrl->value = 0;
222 		else
223 			ctrl->value = 65535;
224 		return 0;
225 	}
226 	return -EINVAL;
227 }
228 
229 static int vidioc_s_ctrl(struct file *file, void *priv,
230 				struct v4l2_control *ctrl)
231 {
232 	struct video_device *dev = video_devdata(file);
233 	struct rt_device *rt = dev->priv;
234 
235 	switch (ctrl->id) {
236 	case V4L2_CID_AUDIO_MUTE:
237 		if (ctrl->value)
238 			rt_mute(rt);
239 		else
240 			rt_unmute(rt);
241 		return 0;
242 	case V4L2_CID_AUDIO_VOLUME:
243 		if (ctrl->value)
244 			rt_unmute(rt);
245 		else
246 			rt_mute(rt);
247 		return 0;
248 	}
249 	return -EINVAL;
250 }
251 
252 static int vidioc_g_audio(struct file *file, void *priv,
253 				struct v4l2_audio *a)
254 {
255 	if (a->index > 1)
256 		return -EINVAL;
257 
258 	strcpy(a->name, "Radio");
259 	a->capability = V4L2_AUDCAP_STEREO;
260 	return 0;
261 }
262 
263 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
264 {
265 	*i = 0;
266 	return 0;
267 }
268 
269 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
270 {
271 	if (i != 0)
272 		return -EINVAL;
273 	return 0;
274 }
275 
276 static int vidioc_s_audio(struct file *file, void *priv,
277 				struct v4l2_audio *a)
278 {
279 	if (a->index != 0)
280 		return -EINVAL;
281 	return 0;
282 }
283 
284 static struct rt_device rtrack2_unit;
285 
286 static const struct file_operations rtrack2_fops = {
287 	.owner		= THIS_MODULE,
288 	.open           = video_exclusive_open,
289 	.release        = video_exclusive_release,
290 	.ioctl		= video_ioctl2,
291 #ifdef CONFIG_COMPAT
292 	.compat_ioctl	= v4l_compat_ioctl32,
293 #endif
294 	.llseek         = no_llseek,
295 };
296 
297 static struct video_device rtrack2_radio=
298 {
299 	.owner		= THIS_MODULE,
300 	.name		= "RadioTrack II radio",
301 	.type		= VID_TYPE_TUNER,
302 	.fops           = &rtrack2_fops,
303 	.vidioc_querycap    = vidioc_querycap,
304 	.vidioc_g_tuner     = vidioc_g_tuner,
305 	.vidioc_s_tuner     = vidioc_s_tuner,
306 	.vidioc_g_frequency = vidioc_g_frequency,
307 	.vidioc_s_frequency = vidioc_s_frequency,
308 	.vidioc_queryctrl   = vidioc_queryctrl,
309 	.vidioc_g_ctrl      = vidioc_g_ctrl,
310 	.vidioc_s_ctrl      = vidioc_s_ctrl,
311 	.vidioc_g_audio     = vidioc_g_audio,
312 	.vidioc_s_audio     = vidioc_s_audio,
313 	.vidioc_g_input     = vidioc_g_input,
314 	.vidioc_s_input     = vidioc_s_input,
315 };
316 
317 static int __init rtrack2_init(void)
318 {
319 	if(io==-1)
320 	{
321 		printk(KERN_ERR "You must set an I/O address with io=0x20c or io=0x30c\n");
322 		return -EINVAL;
323 	}
324 	if (!request_region(io, 4, "rtrack2"))
325 	{
326 		printk(KERN_ERR "rtrack2: port 0x%x already in use\n", io);
327 		return -EBUSY;
328 	}
329 
330 	rtrack2_radio.priv=&rtrack2_unit;
331 
332 	spin_lock_init(&lock);
333 	if(video_register_device(&rtrack2_radio, VFL_TYPE_RADIO, radio_nr)==-1)
334 	{
335 		release_region(io, 4);
336 		return -EINVAL;
337 	}
338 
339 	printk(KERN_INFO "AIMSlab Radiotrack II card driver.\n");
340 
341 	/* mute card - prevents noisy bootups */
342 	outb(1, io);
343 	rtrack2_unit.muted = 1;
344 
345 	return 0;
346 }
347 
348 MODULE_AUTHOR("Ben Pfaff");
349 MODULE_DESCRIPTION("A driver for the RadioTrack II radio card.");
350 MODULE_LICENSE("GPL");
351 
352 module_param(io, int, 0);
353 MODULE_PARM_DESC(io, "I/O address of the RadioTrack card (0x20c or 0x30c)");
354 module_param(radio_nr, int, 0);
355 
356 static void __exit rtrack2_cleanup_module(void)
357 {
358 	video_unregister_device(&rtrack2_radio);
359 	release_region(io,4);
360 }
361 
362 module_init(rtrack2_init);
363 module_exit(rtrack2_cleanup_module);
364 
365 /*
366   Local variables:
367   compile-command: "mmake"
368   End:
369 */
370