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540 giacomo 1
/*
2
 * Video capture interface for Linux
3
 *
4
 *              A generic video device interface for the LINUX operating system
5
 *              using a set of device structures/vectors for low level operations.
6
 *
7
 *              This program is free software; you can redistribute it and/or
8
 *              modify it under the terms of the GNU General Public License
9
 *              as published by the Free Software Foundation; either version
10
 *              2 of the License, or (at your option) any later version.
11
 *
12
 * Author:      Alan Cox, <alan@redhat.com>
13
 *
14
 * Fixes:       20000516  Claudio Matsuoka <claudio@conectiva.com>
15
 *              - Added procfs support
16
 */
17
 
18
#include <linuxcomp.h>
19
 
20
#include <linux/module.h>
21
#include <linux/types.h>
22
#include <linux/kernel.h>
23
#include <linux/sched.h>
24
#include <linux/smp_lock.h>
25
#include <linux/mm.h>
26
#include <linux/string.h>
27
#include <linux/errno.h>
28
#include <linux/init.h>
29
#include <linux/kmod.h>
30
#include <linux/slab.h>
31
#include <linux/devfs_fs_kernel.h>
32
#include <asm/uaccess.h>
33
#include <asm/system.h>
34
#include <asm/semaphore.h>
35
 
36
#include <linux/videodev.h>
37
 
38
#define VIDEO_NUM_DEVICES       256
39
#define VIDEO_NAME              "video4linux"
40
 
41
/*
42
 *      sysfs stuff
43
 */
44
 
45
static ssize_t show_name(struct class_device *cd, char *buf)
46
{
47
        struct video_device *vfd = container_of(cd, struct video_device, class_dev);
48
        return sprintf26(buf,"%.*s\n",(int)sizeof(vfd->name),vfd->name);
49
}
50
 
51
static ssize_t show_dev(struct class_device *cd, char *buf)
52
{
53
        struct video_device *vfd = container_of(cd, struct video_device, class_dev);
54
        dev_t dev = MKDEV(VIDEO_MAJOR, vfd->minor);
55
        return print_dev_t(buf,dev);
56
}
57
 
58
static CLASS_DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
59
static CLASS_DEVICE_ATTR(dev,  S_IRUGO, show_dev, NULL);
60
 
61
struct video_device *video_device_alloc(void)
62
{
63
        struct video_device *vfd;
64
 
65
        vfd = kmalloc(sizeof(*vfd),GFP_KERNEL);
66
        if (NULL == vfd)
67
                return NULL;
68
        memset(vfd,0,sizeof(*vfd));
69
        return vfd;
70
}
71
 
72
void video_device_release(struct video_device *vfd)
73
{
74
        kfree(vfd);
75
}
76
 
77
static void video_release(struct class_device *cd)
78
{
79
        struct video_device *vfd = container_of(cd, struct video_device, class_dev);
80
 
81
#if 1 /* needed until all drivers are fixed */
82
        if (!vfd->release)
83
                return;
84
#endif
85
        vfd->release(vfd);
86
}
87
 
88
static struct class video_class = {
89
        .name    = VIDEO_NAME,
90
        .release = video_release,
91
};
92
 
93
/*
94
 *      Active devices
95
 */
96
 
97
static struct video_device *video_device[VIDEO_NUM_DEVICES];
98
static DECLARE_MUTEX(videodev_lock);
99
 
100
struct video_device* video_devdata(struct file *file)
101
{
102
        return video_device[iminor(file->f_dentry->d_inode)];
103
}
104
 
105
/*
106
 *      Open a video device.
107
 */
108
static int video_open(struct inode *inode, struct file *file)
109
{
110
        unsigned int minor = iminor(inode);
111
        int err = 0;
112
        struct video_device *vfl;
113
        struct file_operations *old_fops;
114
 
115
        if(minor>=VIDEO_NUM_DEVICES)
116
                return -ENODEV;
117
        //down(&videodev_lock);
118
        vfl=video_device[minor];
119
        if(vfl==NULL) {
120
                //up(&videodev_lock);
121
                //request_module("char-major-%d-%d", VIDEO_MAJOR, minor);
122
                //down(&videodev_lock);
123
                vfl=video_device[minor];
124
                if (vfl==NULL) {
125
                        //up(&videodev_lock);
126
                        return -ENODEV;
127
                }
128
        }
129
        old_fops = file->f_op;
130
        file->f_op = fops_get(vfl->fops);
131
        if(file->f_op->open)
132
                err = file->f_op->open(inode,file);
133
        if (err) {
134
                fops_put(file->f_op);
135
                file->f_op = fops_get(old_fops);
136
        }
137
        fops_put(old_fops);
138
        //up(&videodev_lock);
139
        return err;
140
}
141
 
142
/*
143
 * helper function -- handles userspace copying for ioctl arguments
144
 */
145
int
146
video_usercopy(struct inode *inode, struct file *file,
147
               unsigned int cmd, unsigned long arg,
148
               int (*func)(struct inode *inode, struct file *file,
149
                           unsigned int cmd, void *arg))
150
{
151
        char    sbuf[128];
152
        void    *mbuf = NULL;
153
        void    *parg = NULL;
154
        int     err  = -EINVAL;
155
 
156
        /*  Copy arguments into temp kernel buffer  */
157
        switch (_IOC_DIR(cmd)) {
158
        case _IOC_NONE:
159
                parg = (void *)arg;
160
                break;
161
        case _IOC_READ: /* some v4l ioctls are marked wrong ... */
162
        case _IOC_WRITE:
163
        case (_IOC_WRITE | _IOC_READ):
164
                if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
165
                        parg = sbuf;
166
                } else {
167
                        /* too big to allocate from stack */
168
                        mbuf = kmalloc(_IOC_SIZE(cmd),GFP_KERNEL);
169
                        if (NULL == mbuf)
170
                                return -ENOMEM;
171
                        parg = mbuf;
172
                }
173
 
174
                err = -EFAULT;
175
                if (copy_from_user(parg, (void *)arg, _IOC_SIZE(cmd)))
176
                        goto out;
177
                break;
178
        }
179
 
180
        /* call driver */
181
        err = func(inode, file, cmd, parg);
182
        if (err == -ENOIOCTLCMD)
183
                err = -EINVAL;
184
        if (err < 0)
185
                goto out;
186
 
187
        /*  Copy results into user buffer  */
188
        switch (_IOC_DIR(cmd))
189
        {
190
        case _IOC_READ:
191
        case (_IOC_WRITE | _IOC_READ):
192
                if (copy_to_user((void *)arg, parg, _IOC_SIZE(cmd)))
193
                        err = -EFAULT;
194
                break;
195
        }
196
 
197
out:
198
        if (mbuf)
199
                kfree(mbuf);
200
        return err;
201
}
202
 
203
/*
204
 * open/release helper functions -- handle exclusive opens
205
 */
206
extern int video_exclusive_open(struct inode *inode, struct file *file)
207
{
208
        struct  video_device *vfl = video_devdata(file);
209
        int retval = 0;
210
 
211
        //down(&vfl->lock);
212
        if (vfl->users) {
213
                retval = -EBUSY;
214
        } else {
215
                vfl->users++;
216
        }
217
        //up(&vfl->lock);
218
        return retval;
219
}
220
 
221
extern int video_exclusive_release(struct inode *inode, struct file *file)
222
{
223
        struct  video_device *vfl = video_devdata(file);
224
 
225
        vfl->users--;
226
        return 0;
227
}
228
 
229
extern struct file_operations video_fops;
230
 
231
/**
232
 *      video_register_device - register video4linux devices
233
 *      @vfd:  video device structure we want to register
234
 *      @type: type of device to register
235
 *      @nr:   which device number (0 == /dev/video0, 1 == /dev/video1, ...
236
 *             -1 == first free)
237
 *     
238
 *      The registration code assigns minor numbers based on the type
239
 *      requested. -ENFILE is returned in all the device slots for this
240
 *      category are full. If not then the minor field is set and the
241
 *      driver initialize function is called (if non %NULL).
242
 *
243
 *      Zero is returned on success.
244
 *
245
 *      Valid types are
246
 *
247
 *      %VFL_TYPE_GRABBER - A frame grabber
248
 *
249
 *      %VFL_TYPE_VTX - A teletext device
250
 *
251
 *      %VFL_TYPE_VBI - Vertical blank data (undecoded)
252
 *
253
 *      %VFL_TYPE_RADIO - A radio card 
254
 */
255
 
256
int video_register_device(struct video_device *vfd, int type, int nr)
257
{
258
        int i=0;
259
        int base;
260
        int end;
261
        char *name_base;
262
 
263
        switch(type)
264
        {
265
                case VFL_TYPE_GRABBER:
266
                        base=0;
267
                        end=64;
268
                        name_base = "video";
269
                        break;
270
                case VFL_TYPE_VTX:
271
                        base=192;
272
                        end=224;
273
                        name_base = "vtx";
274
                        break;
275
                case VFL_TYPE_VBI:
276
                        base=224;
277
                        end=240;
278
                        name_base = "vbi";
279
                        break;
280
                case VFL_TYPE_RADIO:
281
                        base=64;
282
                        end=128;
283
                        name_base = "radio";
284
                        break;
285
                default:
286
                        return -1;
287
        }
288
 
289
        /* pick a minor number */
290
        //down(&videodev_lock);
291
        if (-1 == nr) {
292
                /* use first free */
293
                for(i=base;i<end;i++)
294
                        if (NULL == video_device[i])
295
                                break;
296
                if (i == end) {
297
                        //up(&videodev_lock);
298
                        return -ENFILE;
299
                }
300
        } else {
301
                /* use the one the driver asked for */
302
                i = base+nr;
303
                if (NULL != video_device[i]) {
304
                        //up(&videodev_lock);
305
                        return -ENFILE;
306
                }
307
        }
308
        video_device[i]=vfd;
309
        vfd->minor=i;
310
        //up(&videodev_lock);
311
 
312
        sprintf26(vfd->devfs_name, "v4l/%s%d", name_base, i - base);
313
        devfs_mk_cdev(MKDEV(VIDEO_MAJOR, vfd->minor),
314
                        S_IFCHR | S_IRUSR | S_IWUSR, vfd->devfs_name);
315
        //init_MUTEX(&vfd->lock);
316
 
317
        /* sysfs class */
318
        memset(&vfd->class_dev, 0x00, sizeof(vfd->class_dev));
319
        if (vfd->dev)
320
                vfd->class_dev.dev = vfd->dev;
321
        vfd->class_dev.class       = &video_class;
322
        strncpy(vfd->class_dev.class_id, vfd->devfs_name + 4, BUS_ID_SIZE);
323
        class_device_register(&vfd->class_dev);
324
        class_device_create_file(&vfd->class_dev,
325
                                 &class_device_attr_name);
326
        class_device_create_file(&vfd->class_dev,
327
                                 &class_device_attr_dev);
328
 
329
#if 1 /* needed until all drivers are fixed */
330
        if (!vfd->release)
331
                printk(KERN_WARNING "videodev: \"%s\" has no release callback. "
332
                       "Please fix your driver for proper sysfs support, see "
333
                       "http://lwn.net/Articles/36850/\n", vfd->name);
334
#endif
335
        return 0;
336
}
337
 
338
/**
339
 *      video_unregister_device - unregister a video4linux device
340
 *      @vfd: the device to unregister
341
 *
342
 *      This unregisters the passed device and deassigns the minor
343
 *      number. Future open calls will be met with errors.
344
 */
345
 
346
void video_unregister_device(struct video_device *vfd)
347
{
348
        //down(&videodev_lock);
349
        if(video_device[vfd->minor]!=vfd)
350
                panic("videodev: bad unregister");
351
 
352
        devfs_remove(vfd->devfs_name);
353
        video_device[vfd->minor]=NULL;
354
        class_device_unregister(&vfd->class_dev);
355
        //up(&videodev_lock);
356
}
357
 
358
 
359
static struct file_operations video_fops=
360
{
361
        .owner          = THIS_MODULE,
362
        .llseek         = no_llseek,
363
        .open           = video_open,
364
};
365
 
366
/*
367
 *      Initialise video for linux
368
 */
369
 
370
int __init videodev_init(void)
371
{
372
        printk(KERN_INFO "Linux video capture interface: v1.00\n");
373
        if (register_chrdev(VIDEO_MAJOR,VIDEO_NAME, &video_fops)) {
374
                printk("video_dev: unable to get major %d\n", VIDEO_MAJOR);
375
                return -EIO;
376
        }
377
        class_register(&video_class);
378
        return 0;
379
}
380
 
381
void __exit videodev_exit(void)
382
{
383
        class_unregister(&video_class);
384
        unregister_chrdev(VIDEO_MAJOR, VIDEO_NAME);
385
}
386
 
603 giacomo 387
extern int linuxcomp_setfd(struct inode *i, int i_rdev);
388
 
389
/* Shark Inode emulation */
390
int videodev_open_inode(int num) {
391
 
392
  struct inode *i;
393
 
394
  i = (struct inode *)kmalloc(sizeof(struct inode),GFP_KERNEL);
395
 
396
  linuxcomp_setfd(i,num);
397
 
398
  if (video_open(i,NULL)) {
399
    kfree(i);
400
    return -1;
401
  }
402
 
403
  kfree(i);
404
  return 0;
405
 
406
}
604 giacomo 407
 
408
extern int bttv_ioctl(struct inode *inode, struct file *file,
409
                        unsigned int cmd, unsigned long arg);
410
 
411
int videodev_ioctl_inode(int num,unsigned int cmd,unsigned long arg) {
412
 
413
  struct inode *i;
414
  int res;
603 giacomo 415
 
604 giacomo 416
  i = (struct inode *)kmalloc(sizeof(struct inode),GFP_KERNEL);
417
 
418
  linuxcomp_setfd(i,num);
419
 
420
  res = bttv_ioctl(i,NULL,cmd,arg);
421
 
422
  kfree(i);
423
  return res;
424
 
425
}
426
 
540 giacomo 427
module_init(videodev_init)
428
module_exit(videodev_exit)
429
 
430
EXPORT_SYMBOL(video_register_device);
431
EXPORT_SYMBOL(video_unregister_device);
432
EXPORT_SYMBOL(video_devdata);
433
EXPORT_SYMBOL(video_usercopy);
434
EXPORT_SYMBOL(video_exclusive_open);
435
EXPORT_SYMBOL(video_exclusive_release);
436
EXPORT_SYMBOL(video_device_alloc);
437
EXPORT_SYMBOL(video_device_release);
438
 
439
MODULE_AUTHOR("Alan Cox");
440
MODULE_DESCRIPTION("Device registrar for Video4Linux drivers");
441
MODULE_LICENSE("GPL");
442
 
443
 
444
/*
445
 * Local variables:
446
 * c-basic-offset: 8
447
 * End:
448
 */