1 /* SF16FMI radio driver for Linux radio support
2 * heavily based on rtrack driver...
3 * (c) 1997 M. Kirkwood
4 * (c) 1998 Petr Vandrovec, vandrove@vc.cvut.cz
5 *
6 * Fitted to new interface by Alan Cox <alan.cox@linux.org>
7 * Made working and cleaned up functions <mikael.hedin@irf.se>
8 * Support for ISAPnP by Ladislav Michl <ladis@psi.cz>
9 *
10 * Notes on the hardware
11 *
12 * Frequency control is done digitally -- ie out(port,encodefreq(95.8));
13 * No volume control - only mute/unmute - you have to use line volume
14 * control on SB-part of SF16FMI
15 *
16 */
17
18 #include <linux/kernel.h> /* __setup */
19 #include <linux/module.h> /* Modules */
20 #include <linux/init.h> /* Initdata */
21 #include <linux/ioport.h> /* request_region */
22 #include <linux/delay.h> /* udelay */
23 #include <linux/videodev.h> /* kernel radio structs */
24 #include <linux/isapnp.h>
25 #include <asm/io.h> /* outb, outb_p */
26 #include <asm/uaccess.h> /* copy to/from user */
27 #include <linux/mutex.h>
28
29 struct fmi_device
30 {
31 int port;
32 int curvol; /* 1 or 0 */
33 unsigned long curfreq; /* freq in kHz */
34 __u32 flags;
35 };
36
37 static int io = -1;
38 static int radio_nr = -1;
39 static struct pnp_dev *dev = NULL;
40 static struct mutex lock;
41
42 /* freq is in 1/16 kHz to internal number, hw precision is 50 kHz */
43 /* It is only useful to give freq in intervall of 800 (=0.05Mhz),
44 * other bits will be truncated, e.g 92.7400016 -> 92.7, but
45 * 92.7400017 -> 92.75
46 */
47 #define RSF16_ENCODE(x) ((x)/800+214)
48 #define RSF16_MINFREQ 87*16000
49 #define RSF16_MAXFREQ 108*16000
50
51 static void outbits(int bits, unsigned int data, int port)
52 {
53 while(bits--) {
54 if(data & 1) {
55 outb(5, port);
56 udelay(6);
57 outb(7, port);
58 udelay(6);
59 } else {
60 outb(1, port);
61 udelay(6);
62 outb(3, port);
63 udelay(6);
64 }
65 data>>=1;
66 }
67 }
68
69 static inline void fmi_mute(int port)
70 {
71 mutex_lock(&lock);
72 outb(0x00, port);
73 mutex_unlock(&lock);
74 }
75
76 static inline void fmi_unmute(int port)
77 {
78 mutex_lock(&lock);
79 outb(0x08, port);
80 mutex_unlock(&lock);
81 }
82
83 static inline int fmi_setfreq(struct fmi_device *dev)
84 {
85 int myport = dev->port;
86 unsigned long freq = dev->curfreq;
87
88 mutex_lock(&lock);
89
90 outbits(16, RSF16_ENCODE(freq), myport);
91 outbits(8, 0xC0, myport);
92 msleep(143); /* was schedule_timeout(HZ/7) */
93 mutex_unlock(&lock);
94 if (dev->curvol) fmi_unmute(myport);
95 return 0;
96 }
97
98 static inline int fmi_getsigstr(struct fmi_device *dev)
99 {
100 int val;
101 int res;
102 int myport = dev->port;
103
104
105 mutex_lock(&lock);
106 val = dev->curvol ? 0x08 : 0x00; /* unmute/mute */
107 outb(val, myport);
108 outb(val | 0x10, myport);
109 msleep(143); /* was schedule_timeout(HZ/7) */
110 res = (int)inb(myport+1);
111 outb(val, myport);
112
113 mutex_unlock(&lock);
114 return (res & 2) ? 0 : 0xFFFF;
115 }
116
117 static int fmi_do_ioctl(struct inode *inode, struct file *file,
118 unsigned int cmd, void *arg)
119 {
120 struct video_device *dev = video_devdata(file);
121 struct fmi_device *fmi=dev->priv;
122
123 switch(cmd)
124 {
125 case VIDIOCGCAP:
126 {
127 struct video_capability *v = arg;
128 memset(v,0,sizeof(*v));
129 strcpy(v->name, "SF16-FMx radio");
130 v->type=VID_TYPE_TUNER;
131 v->channels=1;
132 v->audios=1;
133 return 0;
134 }
135 case VIDIOCGTUNER:
136 {
137 struct video_tuner *v = arg;
138 int mult;
139
140 if(v->tuner) /* Only 1 tuner */
141 return -EINVAL;
142 strcpy(v->name, "FM");
143 mult = (fmi->flags & VIDEO_TUNER_LOW) ? 1 : 1000;
144 v->rangelow = RSF16_MINFREQ/mult;
145 v->rangehigh = RSF16_MAXFREQ/mult;
146 v->flags=fmi->flags;
147 v->mode=VIDEO_MODE_AUTO;
148 v->signal = fmi_getsigstr(fmi);
149 return 0;
150 }
151 case VIDIOCSTUNER:
152 {
153 struct video_tuner *v = arg;
154 if(v->tuner!=0)
155 return -EINVAL;
156 fmi->flags = v->flags & VIDEO_TUNER_LOW;
157 /* Only 1 tuner so no setting needed ! */
158 return 0;
159 }
160 case VIDIOCGFREQ:
161 {
162 unsigned long *freq = arg;
163 *freq = fmi->curfreq;
164 if (!(fmi->flags & VIDEO_TUNER_LOW))
165 *freq /= 1000;
166 return 0;
167 }
168 case VIDIOCSFREQ:
169 {
170 unsigned long *freq = arg;
171 if (!(fmi->flags & VIDEO_TUNER_LOW))
172 *freq *= 1000;
173 if (*freq < RSF16_MINFREQ || *freq > RSF16_MAXFREQ )
174 return -EINVAL;
175 /*rounding in steps of 800 to match th freq
176 that will be used */
177 fmi->curfreq = (*freq/800)*800;
178 fmi_setfreq(fmi);
179 return 0;
180 }
181 case VIDIOCGAUDIO:
182 {
183 struct video_audio *v = arg;
184 memset(v,0,sizeof(*v));
185 v->flags=( (!fmi->curvol)*VIDEO_AUDIO_MUTE | VIDEO_AUDIO_MUTABLE);
186 strcpy(v->name, "Radio");
187 v->mode=VIDEO_SOUND_STEREO;
188 return 0;
189 }
190 case VIDIOCSAUDIO:
191 {
192 struct video_audio *v = arg;
193 if(v->audio)
194 return -EINVAL;
195 fmi->curvol= v->flags&VIDEO_AUDIO_MUTE ? 0 : 1;
196 fmi->curvol ?
197 fmi_unmute(fmi->port) : fmi_mute(fmi->port);
198 return 0;
199 }
200 case VIDIOCGUNIT:
201 {
202 struct video_unit *v = arg;
203 v->video=VIDEO_NO_UNIT;
204 v->vbi=VIDEO_NO_UNIT;
205 v->radio=dev->minor;
206 v->audio=0; /* How do we find out this??? */
207 v->teletext=VIDEO_NO_UNIT;
208 return 0;
209 }
210 default:
211 return -ENOIOCTLCMD;
212 }
213 }
214
215 static int fmi_ioctl(struct inode *inode, struct file *file,
216 unsigned int cmd, unsigned long arg)
217 {
218 return video_usercopy(inode, file, cmd, arg, fmi_do_ioctl);
219 }
220
221 static struct fmi_device fmi_unit;
222
223 static struct file_operations fmi_fops = {
224 .owner = THIS_MODULE,
225 .open = video_exclusive_open,
226 .release = video_exclusive_release,
227 .ioctl = fmi_ioctl,
228 .compat_ioctl = v4l_compat_ioctl32,
229 .llseek = no_llseek,
230 };
231
232 static struct video_device fmi_radio=
233 {
234 .owner = THIS_MODULE,
235 .name = "SF16FMx radio",
236 .type = VID_TYPE_TUNER,
237 .hardware = VID_HARDWARE_SF16MI,
238 .fops = &fmi_fops,
239 };
240
241 /* ladis: this is my card. does any other types exist? */
242 static struct isapnp_device_id id_table[] __devinitdata = {
243 { ISAPNP_ANY_ID, ISAPNP_ANY_ID,
244 ISAPNP_VENDOR('M','F','R'), ISAPNP_FUNCTION(0xad10), 0},
245 { ISAPNP_CARD_END, },
246 };
247
248 MODULE_DEVICE_TABLE(isapnp, id_table);
249
250 static int isapnp_fmi_probe(void)
251 {
252 int i = 0;
253
254 while (id_table[i].card_vendor != 0 && dev == NULL) {
255 dev = pnp_find_dev(NULL, id_table[i].vendor,
256 id_table[i].function, NULL);
257 i++;
258 }
259
260 if (!dev)
261 return -ENODEV;
262 if (pnp_device_attach(dev) < 0)
263 return -EAGAIN;
264 if (pnp_activate_dev(dev) < 0) {
265 printk ("radio-sf16fmi: PnP configure failed (out of resources?)\n");
266 pnp_device_detach(dev);
267 return -ENOMEM;
268 }
269 if (!pnp_port_valid(dev, 0)) {
270 pnp_device_detach(dev);
271 return -ENODEV;
272 }
273
274 i = pnp_port_start(dev, 0);
275 printk ("radio-sf16fmi: PnP reports card at %#x\n", i);
276
277 return i;
278 }
279
280 static int __init fmi_init(void)
281 {
282 if (io < 0)
283 io = isapnp_fmi_probe();
284 if (io < 0) {
285 printk(KERN_ERR "radio-sf16fmi: No PnP card found.\n");
286 return io;
287 }
288 if (!request_region(io, 2, "radio-sf16fmi")) {
289 printk(KERN_ERR "radio-sf16fmi: port 0x%x already in use\n", io);
290 return -EBUSY;
291 }
292
293 fmi_unit.port = io;
294 fmi_unit.curvol = 0;
295 fmi_unit.curfreq = 0;
296 fmi_unit.flags = VIDEO_TUNER_LOW;
297 fmi_radio.priv = &fmi_unit;
298
299 mutex_init(&lock);
300
301 if (video_register_device(&fmi_radio, VFL_TYPE_RADIO, radio_nr) == -1) {
302 release_region(io, 2);
303 return -EINVAL;
304 }
305
306 printk(KERN_INFO "SF16FMx radio card driver at 0x%x\n", io);
307 /* mute card - prevents noisy bootups */
308 fmi_mute(io);
309 return 0;
310 }
311
312 MODULE_AUTHOR("Petr Vandrovec, vandrove@vc.cvut.cz and M. Kirkwood");
313 MODULE_DESCRIPTION("A driver for the SF16MI radio.");
314 MODULE_LICENSE("GPL");
315
316 module_param(io, int, 0);
317 MODULE_PARM_DESC(io, "I/O address of the SF16MI card (0x284 or 0x384)");
318 module_param(radio_nr, int, 0);
319
320 static void __exit fmi_cleanup_module(void)
321 {
322 video_unregister_device(&fmi_radio);
323 release_region(io, 2);
324 if (dev)
325 pnp_device_detach(dev);
326 }
327
328 module_init(fmi_init);
329 module_exit(fmi_cleanup_module);
330
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