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1 /*
2  * driver/media/radio/radio-tea5764.c
3  *
4  * Driver for TEA5764 radio chip for linux 2.6.
5  * This driver is for TEA5764 chip from NXP, used in EZX phones from Motorola.
6  * The I2C protocol is used for communicate with chip.
7  *
8  * Based in radio-tea5761.c Copyright (C) 2005 Nokia Corporation
9  *
10  *  Copyright (c) 2008 Fabio Belavenuto <belavenuto@gmail.com>
11  *
12  * This program is free software; you can redistribute it and/or modify
13  * it under the terms of the GNU General Public License as published by
14  * the Free Software Foundation; either version 2 of the License, or
15  * (at your option) any later version.
16  *
17  * This program is distributed in the hope that it will be useful,
18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
20  * GNU General Public License for more details.
21  *
22  * You should have received a copy of the GNU General Public License
23  * along with this program; if not, write to the Free Software
24  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25  *
26  * History:
27  * 2008-12-06   Fabio Belavenuto <belavenuto@gmail.com>
28  *              initial code
29  *
30  * TODO:
31  *  add platform_data support for IRQs platform dependencies
32  *  add RDS support
33  */
34 #include <linux/kernel.h>
35 #include <linux/module.h>
36 #include <linux/init.h>                 /* Initdata                     */
37 #include <linux/videodev2.h>            /* kernel radio structs         */
38 #include <linux/i2c.h>                  /* I2C                          */
39 #include <media/v4l2-common.h>
40 #include <media/v4l2-ioctl.h>
41 #include <linux/version.h>              /* for KERNEL_VERSION MACRO     */
42
43 #define DRIVER_VERSION  "v0.01"
44 #define RADIO_VERSION   KERNEL_VERSION(0, 0, 1)
45
46 #define DRIVER_AUTHOR   "Fabio Belavenuto <belavenuto@gmail.com>"
47 #define DRIVER_DESC     "A driver for the TEA5764 radio chip for EZX Phones."
48
49 #define PINFO(format, ...)\
50         printk(KERN_INFO KBUILD_MODNAME ": "\
51                 DRIVER_VERSION ": " format "\n", ## __VA_ARGS__)
52 #define PWARN(format, ...)\
53         printk(KERN_WARNING KBUILD_MODNAME ": "\
54                 DRIVER_VERSION ": " format "\n", ## __VA_ARGS__)
55 # define PDEBUG(format, ...)\
56         printk(KERN_DEBUG KBUILD_MODNAME ": "\
57                 DRIVER_VERSION ": " format "\n", ## __VA_ARGS__)
58
59 /* Frequency limits in MHz -- these are European values.  For Japanese
60 devices, that would be 76000 and 91000.  */
61 #define FREQ_MIN  87500
62 #define FREQ_MAX 108000
63 #define FREQ_MUL 16
64
65 /* TEA5764 registers */
66 #define TEA5764_MANID           0x002b
67 #define TEA5764_CHIPID          0x5764
68
69 #define TEA5764_INTREG_BLMSK    0x0001
70 #define TEA5764_INTREG_FRRMSK   0x0002
71 #define TEA5764_INTREG_LEVMSK   0x0008
72 #define TEA5764_INTREG_IFMSK    0x0010
73 #define TEA5764_INTREG_BLMFLAG  0x0100
74 #define TEA5764_INTREG_FRRFLAG  0x0200
75 #define TEA5764_INTREG_LEVFLAG  0x0800
76 #define TEA5764_INTREG_IFFLAG   0x1000
77
78 #define TEA5764_FRQSET_SUD      0x8000
79 #define TEA5764_FRQSET_SM       0x4000
80
81 #define TEA5764_TNCTRL_PUPD1    0x8000
82 #define TEA5764_TNCTRL_PUPD0    0x4000
83 #define TEA5764_TNCTRL_BLIM     0x2000
84 #define TEA5764_TNCTRL_SWPM     0x1000
85 #define TEA5764_TNCTRL_IFCTC    0x0800
86 #define TEA5764_TNCTRL_AFM      0x0400
87 #define TEA5764_TNCTRL_SMUTE    0x0200
88 #define TEA5764_TNCTRL_SNC      0x0100
89 #define TEA5764_TNCTRL_MU       0x0080
90 #define TEA5764_TNCTRL_SSL1     0x0040
91 #define TEA5764_TNCTRL_SSL0     0x0020
92 #define TEA5764_TNCTRL_HLSI     0x0010
93 #define TEA5764_TNCTRL_MST      0x0008
94 #define TEA5764_TNCTRL_SWP      0x0004
95 #define TEA5764_TNCTRL_DTC      0x0002
96 #define TEA5764_TNCTRL_AHLSI    0x0001
97
98 #define TEA5764_TUNCHK_LEVEL(x) (((x) & 0x00F0) >> 4)
99 #define TEA5764_TUNCHK_IFCNT(x) (((x) & 0xFE00) >> 9)
100 #define TEA5764_TUNCHK_TUNTO    0x0100
101 #define TEA5764_TUNCHK_LD       0x0008
102 #define TEA5764_TUNCHK_STEREO   0x0004
103
104 #define TEA5764_TESTREG_TRIGFR  0x0800
105
106 struct tea5764_regs {
107         u16 intreg;                             /* INTFLAG & INTMSK */
108         u16 frqset;                             /* FRQSETMSB & FRQSETLSB */
109         u16 tnctrl;                             /* TNCTRL1 & TNCTRL2 */
110         u16 frqchk;                             /* FRQCHKMSB & FRQCHKLSB */
111         u16 tunchk;                             /* IFCHK & LEVCHK */
112         u16 testreg;                            /* TESTBITS & TESTMODE */
113         u16 rdsstat;                            /* RDSSTAT1 & RDSSTAT2 */
114         u16 rdslb;                              /* RDSLBMSB & RDSLBLSB */
115         u16 rdspb;                              /* RDSPBMSB & RDSPBLSB */
116         u16 rdsbc;                              /* RDSBBC & RDSGBC */
117         u16 rdsctrl;                            /* RDSCTRL1 & RDSCTRL2 */
118         u16 rdsbbl;                             /* PAUSEDET & RDSBBL */
119         u16 manid;                              /* MANID1 & MANID2 */
120         u16 chipid;                             /* CHIPID1 & CHIPID2 */
121 } __attribute__ ((packed));
122
123 struct tea5764_write_regs {
124         u8 intreg;                              /* INTMSK */
125         u16 frqset;                             /* FRQSETMSB & FRQSETLSB */
126         u16 tnctrl;                             /* TNCTRL1 & TNCTRL2 */
127         u16 testreg;                            /* TESTBITS & TESTMODE */
128         u16 rdsctrl;                            /* RDSCTRL1 & RDSCTRL2 */
129         u16 rdsbbl;                             /* PAUSEDET & RDSBBL */
130 } __attribute__ ((packed));
131
132 #ifndef RADIO_TEA5764_XTAL
133 #define RADIO_TEA5764_XTAL 1
134 #endif
135
136 static int radio_nr = -1;
137 static int use_xtal = RADIO_TEA5764_XTAL;
138
139 struct tea5764_device {
140         struct i2c_client               *i2c_client;
141         struct video_device             *videodev;
142         struct tea5764_regs             regs;
143         struct mutex                    mutex;
144         int                             users;
145 };
146
147 /* I2C code related */
148 int tea5764_i2c_read(struct tea5764_device *radio)
149 {
150         int i;
151         u16 *p = (u16 *) &radio->regs;
152
153         struct i2c_msg msgs[1] = {
154                 { radio->i2c_client->addr, I2C_M_RD, sizeof(radio->regs),
155                         (void *)&radio->regs },
156         };
157         if (i2c_transfer(radio->i2c_client->adapter, msgs, 1) != 1)
158                 return -EIO;
159         for (i = 0; i < sizeof(struct tea5764_regs) / sizeof(u16); i++)
160                 p[i] = __be16_to_cpu(p[i]);
161
162         return 0;
163 }
164
165 int tea5764_i2c_write(struct tea5764_device *radio)
166 {
167         struct tea5764_write_regs wr;
168         struct tea5764_regs *r = &radio->regs;
169         struct i2c_msg msgs[1] = {
170                 { radio->i2c_client->addr, 0, sizeof(wr), (void *) &wr },
171         };
172         wr.intreg  = r->intreg & 0xff;
173         wr.frqset  = __cpu_to_be16(r->frqset);
174         wr.tnctrl  = __cpu_to_be16(r->tnctrl);
175         wr.testreg = __cpu_to_be16(r->testreg);
176         wr.rdsctrl = __cpu_to_be16(r->rdsctrl);
177         wr.rdsbbl  = __cpu_to_be16(r->rdsbbl);
178         if (i2c_transfer(radio->i2c_client->adapter, msgs, 1) != 1)
179                 return -EIO;
180         return 0;
181 }
182
183 /* V4L2 code related */
184 static struct v4l2_queryctrl radio_qctrl[] = {
185         {
186                 .id            = V4L2_CID_AUDIO_MUTE,
187                 .name          = "Mute",
188                 .minimum       = 0,
189                 .maximum       = 1,
190                 .default_value = 1,
191                 .type          = V4L2_CTRL_TYPE_BOOLEAN,
192         }
193 };
194
195 static void tea5764_power_up(struct tea5764_device *radio)
196 {
197         struct tea5764_regs *r = &radio->regs;
198
199         if (!(r->tnctrl & TEA5764_TNCTRL_PUPD0)) {
200                 r->tnctrl &= ~(TEA5764_TNCTRL_AFM | TEA5764_TNCTRL_MU |
201                                TEA5764_TNCTRL_HLSI);
202                 if (!use_xtal)
203                         r->testreg |= TEA5764_TESTREG_TRIGFR;
204                 else
205                         r->testreg &= ~TEA5764_TESTREG_TRIGFR;
206
207                 r->tnctrl |= TEA5764_TNCTRL_PUPD0;
208                 tea5764_i2c_write(radio);
209         }
210 }
211
212 static void tea5764_power_down(struct tea5764_device *radio)
213 {
214         struct tea5764_regs *r = &radio->regs;
215
216         if (r->tnctrl & TEA5764_TNCTRL_PUPD0) {
217                 r->tnctrl &= ~TEA5764_TNCTRL_PUPD0;
218                 tea5764_i2c_write(radio);
219         }
220 }
221
222 static void tea5764_set_freq(struct tea5764_device *radio, int freq)
223 {
224         struct tea5764_regs *r = &radio->regs;
225
226         /* formula: (freq [+ or -] 225000) / 8192 */
227         if (r->tnctrl & TEA5764_TNCTRL_HLSI)
228                 r->frqset = (freq + 225000) / 8192;
229         else
230                 r->frqset = (freq - 225000) / 8192;
231 }
232
233 static int tea5764_get_freq(struct tea5764_device *radio)
234 {
235         struct tea5764_regs *r = &radio->regs;
236
237         if (r->tnctrl & TEA5764_TNCTRL_HLSI)
238                 return (r->frqchk * 8192) - 225000;
239         else
240                 return (r->frqchk * 8192) + 225000;
241 }
242
243 /* tune an frequency, freq is defined by v4l's TUNER_LOW, i.e. 1/16th kHz */
244 static void tea5764_tune(struct tea5764_device *radio, int freq)
245 {
246         tea5764_set_freq(radio, freq);
247         if (tea5764_i2c_write(radio))
248                 PWARN("Could not set frequency!");
249 }
250
251 static void tea5764_set_audout_mode(struct tea5764_device *radio, int audmode)
252 {
253         struct tea5764_regs *r = &radio->regs;
254         int tnctrl = r->tnctrl;
255
256         if (audmode == V4L2_TUNER_MODE_MONO)
257                 r->tnctrl |= TEA5764_TNCTRL_MST;
258         else
259                 r->tnctrl &= ~TEA5764_TNCTRL_MST;
260         if (tnctrl != r->tnctrl)
261                 tea5764_i2c_write(radio);
262 }
263
264 static int tea5764_get_audout_mode(struct tea5764_device *radio)
265 {
266         struct tea5764_regs *r = &radio->regs;
267
268         if (r->tnctrl & TEA5764_TNCTRL_MST)
269                 return V4L2_TUNER_MODE_MONO;
270         else
271                 return V4L2_TUNER_MODE_STEREO;
272 }
273
274 static void tea5764_mute(struct tea5764_device *radio, int on)
275 {
276         struct tea5764_regs *r = &radio->regs;
277         int tnctrl = r->tnctrl;
278
279         if (on)
280                 r->tnctrl |= TEA5764_TNCTRL_MU;
281         else
282                 r->tnctrl &= ~TEA5764_TNCTRL_MU;
283         if (tnctrl != r->tnctrl)
284                 tea5764_i2c_write(radio);
285 }
286
287 static int tea5764_is_muted(struct tea5764_device *radio)
288 {
289         return radio->regs.tnctrl & TEA5764_TNCTRL_MU;
290 }
291
292 /* V4L2 vidioc */
293 static int vidioc_querycap(struct file *file, void  *priv,
294                                         struct v4l2_capability *v)
295 {
296         struct tea5764_device *radio = video_drvdata(file);
297         struct video_device *dev = radio->videodev;
298
299         strlcpy(v->driver, dev->dev.driver->name, sizeof(v->driver));
300         strlcpy(v->card, dev->name, sizeof(v->card));
301         snprintf(v->bus_info, sizeof(v->bus_info), "I2C:%s", dev->dev.bus_id);
302         v->version = RADIO_VERSION;
303         v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
304         return 0;
305 }
306
307 static int vidioc_g_tuner(struct file *file, void *priv,
308                                 struct v4l2_tuner *v)
309 {
310         struct tea5764_device *radio = video_drvdata(file);
311         struct tea5764_regs *r = &radio->regs;
312
313         if (v->index > 0)
314                 return -EINVAL;
315
316         memset(v, 0, sizeof(v));
317         strcpy(v->name, "FM");
318         v->type = V4L2_TUNER_RADIO;
319         tea5764_i2c_read(radio);
320         v->rangelow   = FREQ_MIN * FREQ_MUL;
321         v->rangehigh  = FREQ_MAX * FREQ_MUL;
322         v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO;
323         if (r->tunchk & TEA5764_TUNCHK_STEREO)
324                         v->rxsubchans = V4L2_TUNER_SUB_STEREO;
325         v->audmode = tea5764_get_audout_mode(radio);
326         v->signal = TEA5764_TUNCHK_LEVEL(r->tunchk) * 0xffff / 0xf;
327         v->afc = TEA5764_TUNCHK_IFCNT(r->tunchk);
328
329         return 0;
330 }
331
332 static int vidioc_s_tuner(struct file *file, void *priv,
333                                 struct v4l2_tuner *v)
334 {
335         struct tea5764_device *radio = video_drvdata(file);
336
337         if (v->index > 0)
338                 return -EINVAL;
339
340         tea5764_set_audout_mode(radio, v->audmode);
341         return 0;
342 }
343
344 static int vidioc_s_frequency(struct file *file, void *priv,
345                                 struct v4l2_frequency *f)
346 {
347         struct tea5764_device *radio = video_drvdata(file);
348
349         if (f->tuner != 0)
350                 return -EINVAL;
351         if (f->frequency == 0) {
352                 /* We special case this as a power down control. */
353                 tea5764_power_down(radio);
354         }
355         if (f->frequency < (FREQ_MIN * FREQ_MUL))
356                 return -EINVAL;
357         if (f->frequency > (FREQ_MAX * FREQ_MUL))
358                 return -EINVAL;
359         tea5764_power_up(radio);
360         tea5764_tune(radio, (f->frequency * 125) / 2);
361         return 0;
362 }
363
364 static int vidioc_g_frequency(struct file *file, void *priv,
365                                 struct v4l2_frequency *f)
366 {
367         struct tea5764_device *radio = video_drvdata(file);
368         struct tea5764_regs *r = &radio->regs;
369
370         tea5764_i2c_read(radio);
371         memset(f, 0, sizeof(f));
372         f->type = V4L2_TUNER_RADIO;
373         if (r->tnctrl & TEA5764_TNCTRL_PUPD0)
374                 f->frequency = (tea5764_get_freq(radio) * 2) / 125;
375         else
376                 f->frequency = 0;
377
378         return 0;
379 }
380
381 static int vidioc_queryctrl(struct file *file, void *priv,
382                             struct v4l2_queryctrl *qc)
383 {
384         int i;
385
386         for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
387                 if (qc->id && qc->id == radio_qctrl[i].id) {
388                         memcpy(qc, &(radio_qctrl[i]), sizeof(*qc));
389                         return 0;
390                 }
391         }
392         return -EINVAL;
393 }
394
395 static int vidioc_g_ctrl(struct file *file, void *priv,
396                             struct v4l2_control *ctrl)
397 {
398         struct tea5764_device *radio = video_drvdata(file);
399
400         switch (ctrl->id) {
401         case V4L2_CID_AUDIO_MUTE:
402                 tea5764_i2c_read(radio);
403                 ctrl->value = tea5764_is_muted(radio) ? 1 : 0;
404                 return 0;
405         }
406         return -EINVAL;
407 }
408
409 static int vidioc_s_ctrl(struct file *file, void *priv,
410                             struct v4l2_control *ctrl)
411 {
412         struct tea5764_device *radio = video_drvdata(file);
413
414         switch (ctrl->id) {
415         case V4L2_CID_AUDIO_MUTE:
416                 tea5764_mute(radio, ctrl->value);
417                 return 0;
418         }
419         return -EINVAL;
420 }
421
422 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
423 {
424         *i = 0;
425         return 0;
426 }
427
428 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
429 {
430         if (i != 0)
431                 return -EINVAL;
432         return 0;
433 }
434
435 static int vidioc_g_audio(struct file *file, void *priv,
436                            struct v4l2_audio *a)
437 {
438         if (a->index > 1)
439                 return -EINVAL;
440
441         strcpy(a->name, "Radio");
442         a->capability = V4L2_AUDCAP_STEREO;
443         return 0;
444 }
445
446 static int vidioc_s_audio(struct file *file, void *priv,
447                            struct v4l2_audio *a)
448 {
449         if (a->index != 0)
450                 return -EINVAL;
451
452         return 0;
453 }
454
455 static int tea5764_open(struct file *file)
456 {
457         /* Currently we support only one device */
458         int minor = video_devdata(file)->minor;
459         struct tea5764_device *radio = video_drvdata(file);
460
461         if (radio->videodev->minor != minor)
462                 return -ENODEV;
463
464         mutex_lock(&radio->mutex);
465         /* Only exclusive access */
466         if (radio->users) {
467                 mutex_unlock(&radio->mutex);
468                 return -EBUSY;
469         }
470         radio->users++;
471         mutex_unlock(&radio->mutex);
472         file->private_data = radio;
473         return 0;
474 }
475
476 static int tea5764_close(struct file *file)
477 {
478         struct tea5764_device *radio = video_drvdata(file);
479
480         if (!radio)
481                 return -ENODEV;
482         mutex_lock(&radio->mutex);
483         radio->users--;
484         mutex_unlock(&radio->mutex);
485         return 0;
486 }
487
488 /* File system interface */
489 static const struct v4l2_file_operations tea5764_fops = {
490         .owner          = THIS_MODULE,
491         .open           = tea5764_open,
492         .release        = tea5764_close,
493         .ioctl          = video_ioctl2,
494 };
495
496 static const struct v4l2_ioctl_ops tea5764_ioctl_ops = {
497         .vidioc_querycap    = vidioc_querycap,
498         .vidioc_g_tuner     = vidioc_g_tuner,
499         .vidioc_s_tuner     = vidioc_s_tuner,
500         .vidioc_g_audio     = vidioc_g_audio,
501         .vidioc_s_audio     = vidioc_s_audio,
502         .vidioc_g_input     = vidioc_g_input,
503         .vidioc_s_input     = vidioc_s_input,
504         .vidioc_g_frequency = vidioc_g_frequency,
505         .vidioc_s_frequency = vidioc_s_frequency,
506         .vidioc_queryctrl   = vidioc_queryctrl,
507         .vidioc_g_ctrl      = vidioc_g_ctrl,
508         .vidioc_s_ctrl      = vidioc_s_ctrl,
509 };
510
511 /* V4L2 interface */
512 static struct video_device tea5764_radio_template = {
513         .name           = "TEA5764 FM-Radio",
514         .fops           = &tea5764_fops,
515         .ioctl_ops      = &tea5764_ioctl_ops,
516         .release        = video_device_release,
517 };
518
519 /* I2C probe: check if the device exists and register with v4l if it is */
520 static int __devinit tea5764_i2c_probe(struct i2c_client *client,
521                                         const struct i2c_device_id *id)
522 {
523         struct tea5764_device *radio;
524         struct tea5764_regs *r;
525         int ret;
526
527         PDEBUG("probe");
528         radio = kmalloc(sizeof(struct tea5764_device), GFP_KERNEL);
529         if (!radio)
530                 return -ENOMEM;
531
532         mutex_init(&radio->mutex);
533         radio->i2c_client = client;
534         ret = tea5764_i2c_read(radio);
535         if (ret)
536                 goto errfr;
537         r = &radio->regs;
538         PDEBUG("chipid = %04X, manid = %04X", r->chipid, r->manid);
539         if (r->chipid != TEA5764_CHIPID ||
540                 (r->manid & 0x0fff) != TEA5764_MANID) {
541                 PWARN("This chip is not a TEA5764!");
542                 ret = -EINVAL;
543                 goto errfr;
544         }
545
546         radio->videodev = video_device_alloc();
547         if (!(radio->videodev)) {
548                 ret = -ENOMEM;
549                 goto errfr;
550         }
551         memcpy(radio->videodev, &tea5764_radio_template,
552                 sizeof(tea5764_radio_template));
553
554         i2c_set_clientdata(client, radio);
555         video_set_drvdata(radio->videodev, radio);
556
557         ret = video_register_device(radio->videodev, VFL_TYPE_RADIO, radio_nr);
558         if (ret < 0) {
559                 PWARN("Could not register video device!");
560                 goto errrel;
561         }
562
563         /* initialize and power off the chip */
564         tea5764_i2c_read(radio);
565         tea5764_set_audout_mode(radio, V4L2_TUNER_MODE_STEREO);
566         tea5764_mute(radio, 1);
567         tea5764_power_down(radio);
568
569         PINFO("registered.");
570         return 0;
571 errrel:
572         video_device_release(radio->videodev);
573 errfr:
574         kfree(radio);
575         return ret;
576 }
577
578 static int __devexit tea5764_i2c_remove(struct i2c_client *client)
579 {
580         struct tea5764_device *radio = i2c_get_clientdata(client);
581
582         PDEBUG("remove");
583         if (radio) {
584                 tea5764_power_down(radio);
585                 video_unregister_device(radio->videodev);
586                 kfree(radio);
587         }
588         return 0;
589 }
590
591 /* I2C subsystem interface */
592 static const struct i2c_device_id tea5764_id[] = {
593         { "radio-tea5764", 0 },
594         { }                                     /* Terminating entry */
595 };
596 MODULE_DEVICE_TABLE(i2c, tea5764_id);
597
598 static struct i2c_driver tea5764_i2c_driver = {
599         .driver = {
600                 .name = "radio-tea5764",
601                 .owner = THIS_MODULE,
602         },
603         .probe = tea5764_i2c_probe,
604         .remove = __devexit_p(tea5764_i2c_remove),
605         .id_table = tea5764_id,
606 };
607
608 /* init the driver */
609 static int __init tea5764_init(void)
610 {
611         int ret = i2c_add_driver(&tea5764_i2c_driver);
612
613         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ": "
614                 DRIVER_DESC "\n");
615         return ret;
616 }
617
618 /* cleanup the driver */
619 static void __exit tea5764_exit(void)
620 {
621         i2c_del_driver(&tea5764_i2c_driver);
622 }
623
624 MODULE_AUTHOR(DRIVER_AUTHOR);
625 MODULE_DESCRIPTION(DRIVER_DESC);
626 MODULE_LICENSE("GPL");
627
628 module_param(use_xtal, int, 1);
629 MODULE_PARM_DESC(use_xtal, "Chip have a xtal connected in board");
630 module_param(radio_nr, int, 0);
631 MODULE_PARM_DESC(radio_nr, "video4linux device number to use");
632
633 module_init(tea5764_init);
634 module_exit(tea5764_exit);