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@lxorguk.ukuu.org.uk>
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 <media/v4l2-ioctl.h>
28 #include <linux/isapnp.h>
29 #include <asm/io.h> /* outb, outb_p */
30 #include <asm/uaccess.h> /* copy to/from user */
31 #include <linux/mutex.h>
32
33 #define RADIO_VERSION KERNEL_VERSION(0,0,2)
34
35 static struct v4l2_queryctrl radio_qctrl[] = {
36 {
37 .id = V4L2_CID_AUDIO_MUTE,
38 .name = "Mute",
39 .minimum = 0,
40 .maximum = 1,
41 .default_value = 1,
42 .type = V4L2_CTRL_TYPE_BOOLEAN,
43 }
44 };
45
46 struct fmi_device
47 {
48 unsigned long in_use;
49 int port;
50 int curvol; /* 1 or 0 */
51 unsigned long curfreq; /* freq in kHz */
52 __u32 flags;
53 };
54
55 static int io = -1;
56 static int radio_nr = -1;
57 static struct pnp_dev *dev = NULL;
58 static struct mutex lock;
59
60 /* freq is in 1/16 kHz to internal number, hw precision is 50 kHz */
61 /* It is only useful to give freq in intervall of 800 (=0.05Mhz),
62 * other bits will be truncated, e.g 92.7400016 -> 92.7, but
63 * 92.7400017 -> 92.75
64 */
65 #define RSF16_ENCODE(x) ((x)/800+214)
66 #define RSF16_MINFREQ 87*16000
67 #define RSF16_MAXFREQ 108*16000
68
outbits(int bits,unsigned int data,int port)69 static void outbits(int bits, unsigned int data, int port)
70 {
71 while(bits--) {
72 if(data & 1) {
73 outb(5, port);
74 udelay(6);
75 outb(7, port);
76 udelay(6);
77 } else {
78 outb(1, port);
79 udelay(6);
80 outb(3, port);
81 udelay(6);
82 }
83 data>>=1;
84 }
85 }
86
fmi_mute(int port)87 static inline void fmi_mute(int port)
88 {
89 mutex_lock(&lock);
90 outb(0x00, port);
91 mutex_unlock(&lock);
92 }
93
fmi_unmute(int port)94 static inline void fmi_unmute(int port)
95 {
96 mutex_lock(&lock);
97 outb(0x08, port);
98 mutex_unlock(&lock);
99 }
100
fmi_setfreq(struct fmi_device * dev)101 static inline int fmi_setfreq(struct fmi_device *dev)
102 {
103 int myport = dev->port;
104 unsigned long freq = dev->curfreq;
105
106 mutex_lock(&lock);
107
108 outbits(16, RSF16_ENCODE(freq), myport);
109 outbits(8, 0xC0, myport);
110 msleep(143); /* was schedule_timeout(HZ/7) */
111 mutex_unlock(&lock);
112 if (dev->curvol) fmi_unmute(myport);
113 return 0;
114 }
115
fmi_getsigstr(struct fmi_device * dev)116 static inline int fmi_getsigstr(struct fmi_device *dev)
117 {
118 int val;
119 int res;
120 int myport = dev->port;
121
122
123 mutex_lock(&lock);
124 val = dev->curvol ? 0x08 : 0x00; /* unmute/mute */
125 outb(val, myport);
126 outb(val | 0x10, myport);
127 msleep(143); /* was schedule_timeout(HZ/7) */
128 res = (int)inb(myport+1);
129 outb(val, myport);
130
131 mutex_unlock(&lock);
132 return (res & 2) ? 0 : 0xFFFF;
133 }
134
vidioc_querycap(struct file * file,void * priv,struct v4l2_capability * v)135 static int vidioc_querycap(struct file *file, void *priv,
136 struct v4l2_capability *v)
137 {
138 strlcpy(v->driver, "radio-sf16fmi", sizeof(v->driver));
139 strlcpy(v->card, "SF16-FMx radio", sizeof(v->card));
140 sprintf(v->bus_info, "ISA");
141 v->version = RADIO_VERSION;
142 v->capabilities = V4L2_CAP_TUNER;
143 return 0;
144 }
145
vidioc_g_tuner(struct file * file,void * priv,struct v4l2_tuner * v)146 static int vidioc_g_tuner(struct file *file, void *priv,
147 struct v4l2_tuner *v)
148 {
149 int mult;
150 struct fmi_device *fmi = video_drvdata(file);
151
152 if (v->index > 0)
153 return -EINVAL;
154
155 strcpy(v->name, "FM");
156 v->type = V4L2_TUNER_RADIO;
157 mult = (fmi->flags & V4L2_TUNER_CAP_LOW) ? 1 : 1000;
158 v->rangelow = RSF16_MINFREQ/mult;
159 v->rangehigh = RSF16_MAXFREQ/mult;
160 v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_MODE_STEREO;
161 v->capability = fmi->flags&V4L2_TUNER_CAP_LOW;
162 v->audmode = V4L2_TUNER_MODE_STEREO;
163 v->signal = fmi_getsigstr(fmi);
164 return 0;
165 }
166
vidioc_s_tuner(struct file * file,void * priv,struct v4l2_tuner * v)167 static int vidioc_s_tuner(struct file *file, void *priv,
168 struct v4l2_tuner *v)
169 {
170 if (v->index > 0)
171 return -EINVAL;
172 return 0;
173 }
174
vidioc_s_frequency(struct file * file,void * priv,struct v4l2_frequency * f)175 static int vidioc_s_frequency(struct file *file, void *priv,
176 struct v4l2_frequency *f)
177 {
178 struct fmi_device *fmi = video_drvdata(file);
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
vidioc_g_frequency(struct file * file,void * priv,struct v4l2_frequency * f)192 static int vidioc_g_frequency(struct file *file, void *priv,
193 struct v4l2_frequency *f)
194 {
195 struct fmi_device *fmi = video_drvdata(file);
196
197 f->type = V4L2_TUNER_RADIO;
198 f->frequency = fmi->curfreq;
199 if (!(fmi->flags & V4L2_TUNER_CAP_LOW))
200 f->frequency /= 1000;
201 return 0;
202 }
203
vidioc_queryctrl(struct file * file,void * priv,struct v4l2_queryctrl * qc)204 static int vidioc_queryctrl(struct file *file, void *priv,
205 struct v4l2_queryctrl *qc)
206 {
207 int i;
208
209 for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
210 if (qc->id && qc->id == radio_qctrl[i].id) {
211 memcpy(qc, &(radio_qctrl[i]),
212 sizeof(*qc));
213 return 0;
214 }
215 }
216 return -EINVAL;
217 }
218
vidioc_g_ctrl(struct file * file,void * priv,struct v4l2_control * ctrl)219 static int vidioc_g_ctrl(struct file *file, void *priv,
220 struct v4l2_control *ctrl)
221 {
222 struct fmi_device *fmi = video_drvdata(file);
223
224 switch (ctrl->id) {
225 case V4L2_CID_AUDIO_MUTE:
226 ctrl->value = fmi->curvol;
227 return 0;
228 }
229 return -EINVAL;
230 }
231
vidioc_s_ctrl(struct file * file,void * priv,struct v4l2_control * ctrl)232 static int vidioc_s_ctrl(struct file *file, void *priv,
233 struct v4l2_control *ctrl)
234 {
235 struct fmi_device *fmi = video_drvdata(file);
236
237 switch (ctrl->id) {
238 case V4L2_CID_AUDIO_MUTE:
239 if (ctrl->value)
240 fmi_mute(fmi->port);
241 else
242 fmi_unmute(fmi->port);
243 fmi->curvol = ctrl->value;
244 return 0;
245 }
246 return -EINVAL;
247 }
248
vidioc_g_audio(struct file * file,void * priv,struct v4l2_audio * a)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
vidioc_g_input(struct file * filp,void * priv,unsigned int * i)260 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
261 {
262 *i = 0;
263 return 0;
264 }
265
vidioc_s_input(struct file * filp,void * priv,unsigned int i)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
vidioc_s_audio(struct file * file,void * priv,struct v4l2_audio * a)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 fmi_device fmi_unit;
282
fmi_exclusive_open(struct file * file)283 static int fmi_exclusive_open(struct file *file)
284 {
285 return test_and_set_bit(0, &fmi_unit.in_use) ? -EBUSY : 0;
286 }
287
fmi_exclusive_release(struct file * file)288 static int fmi_exclusive_release(struct file *file)
289 {
290 clear_bit(0, &fmi_unit.in_use);
291 return 0;
292 }
293
294 static const struct v4l2_file_operations fmi_fops = {
295 .owner = THIS_MODULE,
296 .open = fmi_exclusive_open,
297 .release = fmi_exclusive_release,
298 .ioctl = video_ioctl2,
299 };
300
301 static const struct v4l2_ioctl_ops fmi_ioctl_ops = {
302 .vidioc_querycap = vidioc_querycap,
303 .vidioc_g_tuner = vidioc_g_tuner,
304 .vidioc_s_tuner = vidioc_s_tuner,
305 .vidioc_g_audio = vidioc_g_audio,
306 .vidioc_s_audio = vidioc_s_audio,
307 .vidioc_g_input = vidioc_g_input,
308 .vidioc_s_input = vidioc_s_input,
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 };
315
316 static struct video_device fmi_radio = {
317 .name = "SF16FMx radio",
318 .fops = &fmi_fops,
319 .ioctl_ops = &fmi_ioctl_ops,
320 .release = video_device_release_empty,
321 };
322
323 /* ladis: this is my card. does any other types exist? */
324 static struct isapnp_device_id id_table[] __devinitdata = {
325 { ISAPNP_ANY_ID, ISAPNP_ANY_ID,
326 ISAPNP_VENDOR('M','F','R'), ISAPNP_FUNCTION(0xad10), 0},
327 { ISAPNP_CARD_END, },
328 };
329
330 MODULE_DEVICE_TABLE(isapnp, id_table);
331
isapnp_fmi_probe(void)332 static int __init isapnp_fmi_probe(void)
333 {
334 int i = 0;
335
336 while (id_table[i].card_vendor != 0 && dev == NULL) {
337 dev = pnp_find_dev(NULL, id_table[i].vendor,
338 id_table[i].function, NULL);
339 i++;
340 }
341
342 if (!dev)
343 return -ENODEV;
344 if (pnp_device_attach(dev) < 0)
345 return -EAGAIN;
346 if (pnp_activate_dev(dev) < 0) {
347 printk ("radio-sf16fmi: PnP configure failed (out of resources?)\n");
348 pnp_device_detach(dev);
349 return -ENOMEM;
350 }
351 if (!pnp_port_valid(dev, 0)) {
352 pnp_device_detach(dev);
353 return -ENODEV;
354 }
355
356 i = pnp_port_start(dev, 0);
357 printk ("radio-sf16fmi: PnP reports card at %#x\n", i);
358
359 return i;
360 }
361
fmi_init(void)362 static int __init fmi_init(void)
363 {
364 if (io < 0)
365 io = isapnp_fmi_probe();
366 if (io < 0) {
367 printk(KERN_ERR "radio-sf16fmi: No PnP card found.\n");
368 return io;
369 }
370 if (!request_region(io, 2, "radio-sf16fmi")) {
371 printk(KERN_ERR "radio-sf16fmi: port 0x%x already in use\n", io);
372 pnp_device_detach(dev);
373 return -EBUSY;
374 }
375
376 fmi_unit.port = io;
377 fmi_unit.curvol = 0;
378 fmi_unit.curfreq = 0;
379 fmi_unit.flags = V4L2_TUNER_CAP_LOW;
380 video_set_drvdata(&fmi_radio, &fmi_unit);
381
382 mutex_init(&lock);
383
384 if (video_register_device(&fmi_radio, VFL_TYPE_RADIO, radio_nr) < 0) {
385 release_region(io, 2);
386 return -EINVAL;
387 }
388
389 printk(KERN_INFO "SF16FMx radio card driver at 0x%x\n", io);
390 /* mute card - prevents noisy bootups */
391 fmi_mute(io);
392 return 0;
393 }
394
395 MODULE_AUTHOR("Petr Vandrovec, vandrove@vc.cvut.cz and M. Kirkwood");
396 MODULE_DESCRIPTION("A driver for the SF16MI radio.");
397 MODULE_LICENSE("GPL");
398
399 module_param(io, int, 0);
400 MODULE_PARM_DESC(io, "I/O address of the SF16MI card (0x284 or 0x384)");
401 module_param(radio_nr, int, 0);
402
fmi_cleanup_module(void)403 static void __exit fmi_cleanup_module(void)
404 {
405 video_unregister_device(&fmi_radio);
406 release_region(io, 2);
407 if (dev)
408 pnp_device_detach(dev);
409 }
410
411 module_init(fmi_init);
412 module_exit(fmi_cleanup_module);
413