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 * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
17 */
18
19 #include <linux/version.h>
20 #include <linux/kernel.h> /* __setup */
21 #include <linux/module.h> /* Modules */
22 #include <linux/init.h> /* Initdata */
23 #include <linux/ioport.h> /* request_region */
24 #include <linux/delay.h> /* udelay */
25 #include <linux/videodev2.h> /* kernel radio structs */
26 #include <media/v4l2-common.h>
27 #include <linux/isapnp.h>
28 #include <asm/io.h> /* outb, outb_p */
29 #include <asm/uaccess.h> /* copy to/from user */
30 #include <linux/mutex.h>
31
32 #define RADIO_VERSION KERNEL_VERSION(0,0,2)
33
34 static struct v4l2_queryctrl radio_qctrl[] = {
35 {
36 .id = V4L2_CID_AUDIO_MUTE,
37 .name = "Mute",
38 .minimum = 0,
39 .maximum = 1,
40 .default_value = 1,
41 .type = V4L2_CTRL_TYPE_BOOLEAN,
42 }
43 };
44
45 struct fmi_device
46 {
47 int port;
48 int curvol; /* 1 or 0 */
49 unsigned long curfreq; /* freq in kHz */
50 __u32 flags;
51 };
52
53 static int io = -1;
54 static int radio_nr = -1;
55 static struct pnp_dev *dev = NULL;
56 static struct mutex lock;
57
58 /* freq is in 1/16 kHz to internal number, hw precision is 50 kHz */
59 /* It is only useful to give freq in intervall of 800 (=0.05Mhz),
60 * other bits will be truncated, e.g 92.7400016 -> 92.7, but
61 * 92.7400017 -> 92.75
62 */
63 #define RSF16_ENCODE(x) ((x)/800+214)
64 #define RSF16_MINFREQ 87*16000
65 #define RSF16_MAXFREQ 108*16000
66
67 static void outbits(int bits, unsigned int data, int port)
68 {
69 while(bits--) {
70 if(data & 1) {
71 outb(5, port);
72 udelay(6);
73 outb(7, port);
74 udelay(6);
75 } else {
76 outb(1, port);
77 udelay(6);
78 outb(3, port);
79 udelay(6);
80 }
81 data>>=1;
82 }
83 }
84
85 static inline void fmi_mute(int port)
86 {
87 mutex_lock(&lock);
88 outb(0x00, port);
89 mutex_unlock(&lock);
90 }
91
92 static inline void fmi_unmute(int port)
93 {
94 mutex_lock(&lock);
95 outb(0x08, port);
96 mutex_unlock(&lock);
97 }
98
99 static inline int fmi_setfreq(struct fmi_device *dev)
100 {
101 int myport = dev->port;
102 unsigned long freq = dev->curfreq;
103
104 mutex_lock(&lock);
105
106 outbits(16, RSF16_ENCODE(freq), myport);
107 outbits(8, 0xC0, myport);
108 msleep(143); /* was schedule_timeout(HZ/7) */
109 mutex_unlock(&lock);
110 if (dev->curvol) fmi_unmute(myport);
111 return 0;
112 }
113
114 static inline int fmi_getsigstr(struct fmi_device *dev)
115 {
116 int val;
117 int res;
118 int myport = dev->port;
119
120
121 mutex_lock(&lock);
122 val = dev->curvol ? 0x08 : 0x00; /* unmute/mute */
123 outb(val, myport);
124 outb(val | 0x10, myport);
125 msleep(143); /* was schedule_timeout(HZ/7) */
126 res = (int)inb(myport+1);
127 outb(val, myport);
128
129 mutex_unlock(&lock);
130 return (res & 2) ? 0 : 0xFFFF;
131 }
132
133 static int vidioc_querycap(struct file *file, void *priv,
134 struct v4l2_capability *v)
135 {
136 strlcpy(v->driver, "radio-sf16fmi", sizeof(v->driver));
137 strlcpy(v->card, "SF16-FMx radio", sizeof(v->card));
138 sprintf(v->bus_info, "ISA");
139 v->version = RADIO_VERSION;
140 v->capabilities = V4L2_CAP_TUNER;
141 return 0;
142 }
143
144 static int vidioc_g_tuner(struct file *file, void *priv,
145 struct v4l2_tuner *v)
146 {
147 int mult;
148 struct video_device *dev = video_devdata(file);
149 struct fmi_device *fmi = dev->priv;
150
151 if (v->index > 0)
152 return -EINVAL;
153
154 strcpy(v->name, "FM");
155 v->type = V4L2_TUNER_RADIO;
156 mult = (fmi->flags & V4L2_TUNER_CAP_LOW) ? 1 : 1000;
157 v->rangelow = RSF16_MINFREQ/mult;
158 v->rangehigh = RSF16_MAXFREQ/mult;
159 v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_MODE_STEREO;
160 v->capability = fmi->flags&V4L2_TUNER_CAP_LOW;
161 v->audmode = V4L2_TUNER_MODE_STEREO;
162 v->signal = fmi_getsigstr(fmi);
163 return 0;
164 }
165
166 static int vidioc_s_tuner(struct file *file, void *priv,
167 struct v4l2_tuner *v)
168 {
169 if (v->index > 0)
170 return -EINVAL;
171 return 0;
172 }
173
174 static 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 fmi_device *fmi = dev->priv;
179
180 if (!(fmi->flags & V4L2_TUNER_CAP_LOW))
181 f->frequency *= 1000;
182 if (f->frequency < RSF16_MINFREQ ||
183 f->frequency > RSF16_MAXFREQ )
184 return -EINVAL;
185 /*rounding in steps of 800 to match th freq
186 that will be used */
187 fmi->curfreq = (f->frequency/800)*800;
188 fmi_setfreq(fmi);
189 return 0;
190 }
191
192 static int vidioc_g_frequency(struct file *file, void *priv,
193 struct v4l2_frequency *f)
194 {
195 struct video_device *dev = video_devdata(file);
196 struct fmi_device *fmi = dev->priv;
197
198 f->type = V4L2_TUNER_RADIO;
199 f->frequency = fmi->curfreq;
200 if (!(fmi->flags & V4L2_TUNER_CAP_LOW))
201 f->frequency /= 1000;
202 return 0;
203 }
204
205 static int vidioc_queryctrl(struct file *file, void *priv,
206 struct v4l2_queryctrl *qc)
207 {
208 int i;
209
210 for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
211 if (qc->id && qc->id == radio_qctrl[i].id) {
212 memcpy(qc, &(radio_qctrl[i]),
213 sizeof(*qc));
214 return 0;
215 }
216 }
217 return -EINVAL;
218 }
219
220 static int vidioc_g_ctrl(struct file *file, void *priv,
221 struct v4l2_control *ctrl)
222 {
223 struct video_device *dev = video_devdata(file);
224 struct fmi_device *fmi = dev->priv;
225
226 switch (ctrl->id) {
227 case V4L2_CID_AUDIO_MUTE:
228 ctrl->value = fmi->curvol;
229 return 0;
230 }
231 return -EINVAL;
232 }
233
234 static int vidioc_s_ctrl(struct file *file, void *priv,
235 struct v4l2_control *ctrl)
236 {
237 struct video_device *dev = video_devdata(file);
238 struct fmi_device *fmi = dev->priv;
239
240 switch (ctrl->id) {
241 case V4L2_CID_AUDIO_MUTE:
242 if (ctrl->value)
243 fmi_mute(fmi->port);
244 else
245 fmi_unmute(fmi->port);
246 fmi->curvol = ctrl->value;
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 fmi_device fmi_unit;
285
286 static const struct file_operations fmi_fops = {
287 .owner = THIS_MODULE,
288 .open = video_exclusive_open,
289 .release = video_exclusive_release,
290 .ioctl = video_ioctl2,
291 .compat_ioctl = v4l_compat_ioctl32,
292 .llseek = no_llseek,
293 };
294
295 static struct video_device fmi_radio=
296 {
297 .owner = THIS_MODULE,
298 .name = "SF16FMx radio",
299 .type = VID_TYPE_TUNER,
300 .fops = &fmi_fops,
301 .vidioc_querycap = vidioc_querycap,
302 .vidioc_g_tuner = vidioc_g_tuner,
303 .vidioc_s_tuner = vidioc_s_tuner,
304 .vidioc_g_audio = vidioc_g_audio,
305 .vidioc_s_audio = vidioc_s_audio,
306 .vidioc_g_input = vidioc_g_input,
307 .vidioc_s_input = vidioc_s_input,
308 .vidioc_g_frequency = vidioc_g_frequency,
309 .vidioc_s_frequency = vidioc_s_frequency,
310 .vidioc_queryctrl = vidioc_queryctrl,
311 .vidioc_g_ctrl = vidioc_g_ctrl,
312 .vidioc_s_ctrl = vidioc_s_ctrl,
313 };
314
315 /* ladis: this is my card. does any other types exist? */
316 static struct isapnp_device_id id_table[] __devinitdata = {
317 { ISAPNP_ANY_ID, ISAPNP_ANY_ID,
318 ISAPNP_VENDOR('M','F','R'), ISAPNP_FUNCTION(0xad10), 0},
319 { ISAPNP_CARD_END, },
320 };
321
322 MODULE_DEVICE_TABLE(isapnp, id_table);
323
324 static int __init isapnp_fmi_probe(void)
325 {
326 int i = 0;
327
328 while (id_table[i].card_vendor != 0 && dev == NULL) {
329 dev = pnp_find_dev(NULL, id_table[i].vendor,
330 id_table[i].function, NULL);
331 i++;
332 }
333
334 if (!dev)
335 return -ENODEV;
336 if (pnp_device_attach(dev) < 0)
337 return -EAGAIN;
338 if (pnp_activate_dev(dev) < 0) {
339 printk ("radio-sf16fmi: PnP configure failed (out of resources?)\n");
340 pnp_device_detach(dev);
341 return -ENOMEM;
342 }
343 if (!pnp_port_valid(dev, 0)) {
344 pnp_device_detach(dev);
345 return -ENODEV;
346 }
347
348 i = pnp_port_start(dev, 0);
349 printk ("radio-sf16fmi: PnP reports card at %#x\n", i);
350
351 return i;
352 }
353
354 static int __init fmi_init(void)
355 {
356 if (io < 0)
357 io = isapnp_fmi_probe();
358 if (io < 0) {
359 printk(KERN_ERR "radio-sf16fmi: No PnP card found.\n");
360 return io;
361 }
362 if (!request_region(io, 2, "radio-sf16fmi")) {
363 printk(KERN_ERR "radio-sf16fmi: port 0x%x already in use\n", io);
364 pnp_device_detach(dev);
365 return -EBUSY;
366 }
367
368 fmi_unit.port = io;
369 fmi_unit.curvol = 0;
370 fmi_unit.curfreq = 0;
371 fmi_unit.flags = V4L2_TUNER_CAP_LOW;
372 fmi_radio.priv = &fmi_unit;
373
374 mutex_init(&lock);
375
376 if (video_register_device(&fmi_radio, VFL_TYPE_RADIO, radio_nr) == -1) {
377 release_region(io, 2);
378 return -EINVAL;
379 }
380
381 printk(KERN_INFO "SF16FMx radio card driver at 0x%x\n", io);
382 /* mute card - prevents noisy bootups */
383 fmi_mute(io);
384 return 0;
385 }
386
387 MODULE_AUTHOR("Petr Vandrovec, vandrove@vc.cvut.cz and M. Kirkwood");
388 MODULE_DESCRIPTION("A driver for the SF16MI radio.");
389 MODULE_LICENSE("GPL");
390
391 module_param(io, int, 0);
392 MODULE_PARM_DESC(io, "I/O address of the SF16MI card (0x284 or 0x384)");
393 module_param(radio_nr, int, 0);
394
395 static void __exit fmi_cleanup_module(void)
396 {
397 video_unregister_device(&fmi_radio);
398 release_region(io, 2);
399 if (dev)
400 pnp_device_detach(dev);
401 }
402
403 module_init(fmi_init);
404 module_exit(fmi_cleanup_module);
405
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