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 
26 static 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 
49 static int io = CONFIG_RADIO_RTRACK2_PORT;
50 static int radio_nr = -1;
51 static spinlock_t lock;
52 
53 struct 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 
64 static 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 
74 static 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 
84 static void zero(void)
85 {
86 	outb_p(1, io);
87 	outb_p(3, io);
88 	outb_p(1, io);
89 }
90 
91 static void one(void)
92 {
93 	outb_p(5, io);
94 	outb_p(7, io);
95 	outb_p(5, io);
96 }
97 
98 static 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 
127 static 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 
138 static 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 
147 static 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 
154 static 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 
173 static 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 
183 static 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 
193 static 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 
208 static 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 
227 static 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 
249 static 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 
260 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
261 {
262 	*i = 0;
263 	return 0;
264 }
265 
266 static 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 
273 static 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 
281 static struct rt_device rtrack2_unit;
282 
283 static int rtrack2_exclusive_open(struct inode *inode, struct file *file)
284 {
285 	return test_and_set_bit(0, &rtrack2_unit.in_use) ? -EBUSY : 0;
286 }
287 
288 static int rtrack2_exclusive_release(struct inode *inode, struct file *file)
289 {
290 	clear_bit(0, &rtrack2_unit.in_use);
291 	return 0;
292 }
293 
294 static const struct file_operations rtrack2_fops = {
295 	.owner		= THIS_MODULE,
296 	.open           = rtrack2_exclusive_open,
297 	.release        = rtrack2_exclusive_release,
298 	.ioctl		= video_ioctl2,
299 #ifdef CONFIG_COMPAT
300 	.compat_ioctl	= v4l_compat_ioctl32,
301 #endif
302 	.llseek         = no_llseek,
303 };
304 
305 static const struct v4l2_ioctl_ops rtrack2_ioctl_ops = {
306 	.vidioc_querycap    = vidioc_querycap,
307 	.vidioc_g_tuner     = vidioc_g_tuner,
308 	.vidioc_s_tuner     = vidioc_s_tuner,
309 	.vidioc_g_frequency = vidioc_g_frequency,
310 	.vidioc_s_frequency = vidioc_s_frequency,
311 	.vidioc_queryctrl   = vidioc_queryctrl,
312 	.vidioc_g_ctrl      = vidioc_g_ctrl,
313 	.vidioc_s_ctrl      = vidioc_s_ctrl,
314 	.vidioc_g_audio     = vidioc_g_audio,
315 	.vidioc_s_audio     = vidioc_s_audio,
316 	.vidioc_g_input     = vidioc_g_input,
317 	.vidioc_s_input     = vidioc_s_input,
318 };
319 
320 static struct video_device rtrack2_radio = {
321 	.name		= "RadioTrack II radio",
322 	.fops           = &rtrack2_fops,
323 	.ioctl_ops 	= &rtrack2_ioctl_ops,
324 	.release	= video_device_release_empty,
325 };
326 
327 static int __init rtrack2_init(void)
328 {
329 	if(io==-1)
330 	{
331 		printk(KERN_ERR "You must set an I/O address with io=0x20c or io=0x30c\n");
332 		return -EINVAL;
333 	}
334 	if (!request_region(io, 4, "rtrack2"))
335 	{
336 		printk(KERN_ERR "rtrack2: port 0x%x already in use\n", io);
337 		return -EBUSY;
338 	}
339 
340 	video_set_drvdata(&rtrack2_radio, &rtrack2_unit);
341 
342 	spin_lock_init(&lock);
343 	if (video_register_device(&rtrack2_radio, VFL_TYPE_RADIO, radio_nr) < 0) {
344 		release_region(io, 4);
345 		return -EINVAL;
346 	}
347 
348 	printk(KERN_INFO "AIMSlab Radiotrack II card driver.\n");
349 
350 	/* mute card - prevents noisy bootups */
351 	outb(1, io);
352 	rtrack2_unit.muted = 1;
353 
354 	return 0;
355 }
356 
357 MODULE_AUTHOR("Ben Pfaff");
358 MODULE_DESCRIPTION("A driver for the RadioTrack II radio card.");
359 MODULE_LICENSE("GPL");
360 
361 module_param(io, int, 0);
362 MODULE_PARM_DESC(io, "I/O address of the RadioTrack card (0x20c or 0x30c)");
363 module_param(radio_nr, int, 0);
364 
365 static void __exit rtrack2_cleanup_module(void)
366 {
367 	video_unregister_device(&rtrack2_radio);
368 	release_region(io,4);
369 }
370 
371 module_init(rtrack2_init);
372 module_exit(rtrack2_cleanup_module);
373 
374 /*
375   Local variables:
376   compile-command: "mmake"
377   End:
378 */
379