V4L/DVB (8108): Fix open/close race in saa7134
[linux-3.10.git] / drivers / media / video / saa7134 / saa7134-empress.c
1 /*
2  *
3  * (c) 2004 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
4  *
5  *  This program is free software; you can redistribute it and/or modify
6  *  it under the terms of the GNU General Public License as published by
7  *  the Free Software Foundation; either version 2 of the License, or
8  *  (at your option) any later version.
9  *
10  *  This program is distributed in the hope that it will be useful,
11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13  *  GNU General Public License for more details.
14  *
15  *  You should have received a copy of the GNU General Public License
16  *  along with this program; if not, write to the Free Software
17  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18  */
19
20 #include <linux/init.h>
21 #include <linux/list.h>
22 #include <linux/module.h>
23 #include <linux/kernel.h>
24 #include <linux/slab.h>
25 #include <linux/delay.h>
26
27 #include "saa7134-reg.h"
28 #include "saa7134.h"
29
30 #include <media/saa6752hs.h>
31 #include <media/v4l2-common.h>
32
33 /* ------------------------------------------------------------------ */
34
35 MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
36 MODULE_LICENSE("GPL");
37
38 static unsigned int empress_nr[] = {[0 ... (SAA7134_MAXBOARDS - 1)] = UNSET };
39
40 module_param_array(empress_nr, int, NULL, 0444);
41 MODULE_PARM_DESC(empress_nr,"ts device number");
42
43 static unsigned int debug;
44 module_param(debug, int, 0644);
45 MODULE_PARM_DESC(debug,"enable debug messages");
46
47 #define dprintk(fmt, arg...)    if (debug)                      \
48         printk(KERN_DEBUG "%s/empress: " fmt, dev->name , ## arg)
49
50 /* ------------------------------------------------------------------ */
51
52 static void ts_reset_encoder(struct saa7134_dev* dev)
53 {
54         if (!dev->empress_started)
55                 return;
56
57         saa_writeb(SAA7134_SPECIAL_MODE, 0x00);
58         msleep(10);
59         saa_writeb(SAA7134_SPECIAL_MODE, 0x01);
60         msleep(100);
61         dev->empress_started = 0;
62 }
63
64 static int ts_init_encoder(struct saa7134_dev* dev)
65 {
66         struct v4l2_ext_controls ctrls = { V4L2_CTRL_CLASS_MPEG, 0 };
67
68         ts_reset_encoder(dev);
69         saa7134_i2c_call_clients(dev, VIDIOC_S_EXT_CTRLS, &ctrls);
70         dev->empress_started = 1;
71         return 0;
72 }
73
74 /* ------------------------------------------------------------------ */
75
76 static int ts_open(struct inode *inode, struct file *file)
77 {
78         int minor = iminor(inode);
79         struct saa7134_dev *dev;
80         int err;
81
82         list_for_each_entry(dev, &saa7134_devlist, devlist)
83                 if (dev->empress_dev && dev->empress_dev->minor == minor)
84                         goto found;
85         return -ENODEV;
86  found:
87
88         dprintk("open minor=%d\n",minor);
89         err = -EBUSY;
90         if (!mutex_trylock(&dev->empress_tsq.vb_lock))
91                 goto done;
92         if (dev->empress_users)
93                 goto done_up;
94
95         /* Unmute audio */
96         saa_writeb(SAA7134_AUDIO_MUTE_CTRL,
97                 saa_readb(SAA7134_AUDIO_MUTE_CTRL) & ~(1 << 6));
98
99         dev->empress_users++;
100         file->private_data = dev;
101         err = 0;
102
103 done_up:
104         mutex_unlock(&dev->empress_tsq.vb_lock);
105 done:
106         return err;
107 }
108
109 static int ts_release(struct inode *inode, struct file *file)
110 {
111         struct saa7134_dev *dev = file->private_data;
112
113         mutex_lock(&dev->empress_tsq.vb_lock);
114
115         videobuf_stop(&dev->empress_tsq);
116         videobuf_mmap_free(&dev->empress_tsq);
117
118         /* stop the encoder */
119         ts_reset_encoder(dev);
120
121         /* Mute audio */
122         saa_writeb(SAA7134_AUDIO_MUTE_CTRL,
123                 saa_readb(SAA7134_AUDIO_MUTE_CTRL) | (1 << 6));
124
125         dev->empress_users--;
126
127         mutex_unlock(&dev->empress_tsq.vb_lock);
128
129         return 0;
130 }
131
132 static ssize_t
133 ts_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
134 {
135         struct saa7134_dev *dev = file->private_data;
136
137         if (!dev->empress_started)
138                 ts_init_encoder(dev);
139
140         return videobuf_read_stream(&dev->empress_tsq,
141                                     data, count, ppos, 0,
142                                     file->f_flags & O_NONBLOCK);
143 }
144
145 static unsigned int
146 ts_poll(struct file *file, struct poll_table_struct *wait)
147 {
148         struct saa7134_dev *dev = file->private_data;
149
150         return videobuf_poll_stream(file, &dev->empress_tsq, wait);
151 }
152
153
154 static int
155 ts_mmap(struct file *file, struct vm_area_struct * vma)
156 {
157         struct saa7134_dev *dev = file->private_data;
158
159         return videobuf_mmap_mapper(&dev->empress_tsq, vma);
160 }
161
162 /*
163  * This function is _not_ called directly, but from
164  * video_generic_ioctl (and maybe others).  userspace
165  * copying is done already, arg is a kernel pointer.
166  */
167
168 static int empress_querycap(struct file *file, void  *priv,
169                                         struct v4l2_capability *cap)
170 {
171         struct saa7134_dev *dev = file->private_data;
172
173         strcpy(cap->driver, "saa7134");
174         strlcpy(cap->card, saa7134_boards[dev->board].name,
175                 sizeof(cap->card));
176         sprintf(cap->bus_info, "PCI:%s", pci_name(dev->pci));
177         cap->version = SAA7134_VERSION_CODE;
178         cap->capabilities =
179                 V4L2_CAP_VIDEO_CAPTURE |
180                 V4L2_CAP_READWRITE |
181                 V4L2_CAP_STREAMING;
182         return 0;
183 }
184
185 static int empress_enum_input(struct file *file, void *priv,
186                                         struct v4l2_input *i)
187 {
188         if (i->index != 0)
189                 return -EINVAL;
190
191         i->type = V4L2_INPUT_TYPE_CAMERA;
192         strcpy(i->name, "CCIR656");
193
194         return 0;
195 }
196
197 static int empress_g_input(struct file *file, void *priv, unsigned int *i)
198 {
199         *i = 0;
200         return 0;
201 }
202
203 static int empress_s_input(struct file *file, void *priv, unsigned int i)
204 {
205         if (i != 0)
206                 return -EINVAL;
207
208         return 0;
209 }
210
211 static int empress_enum_fmt_cap(struct file *file, void  *priv,
212                                         struct v4l2_fmtdesc *f)
213 {
214         if (f->index != 0)
215                 return -EINVAL;
216
217         strlcpy(f->description, "MPEG TS", sizeof(f->description));
218         f->pixelformat = V4L2_PIX_FMT_MPEG;
219
220         return 0;
221 }
222
223 static int empress_g_fmt_cap(struct file *file, void *priv,
224                                 struct v4l2_format *f)
225 {
226         struct saa7134_dev *dev = file->private_data;
227
228         saa7134_i2c_call_clients(dev, VIDIOC_G_FMT, f);
229
230         f->fmt.pix.pixelformat  = V4L2_PIX_FMT_MPEG;
231         f->fmt.pix.sizeimage    = TS_PACKET_SIZE * dev->ts.nr_packets;
232
233         return 0;
234 }
235
236 static int empress_s_fmt_cap(struct file *file, void *priv,
237                                 struct v4l2_format *f)
238 {
239         struct saa7134_dev *dev = file->private_data;
240
241         saa7134_i2c_call_clients(dev, VIDIOC_S_FMT, f);
242
243         f->fmt.pix.pixelformat  = V4L2_PIX_FMT_MPEG;
244         f->fmt.pix.sizeimage    = TS_PACKET_SIZE * dev->ts.nr_packets;
245
246         return 0;
247 }
248
249
250 static int empress_reqbufs(struct file *file, void *priv,
251                                         struct v4l2_requestbuffers *p)
252 {
253         struct saa7134_dev *dev = file->private_data;
254
255         return videobuf_reqbufs(&dev->empress_tsq, p);
256 }
257
258 static int empress_querybuf(struct file *file, void *priv,
259                                         struct v4l2_buffer *b)
260 {
261         struct saa7134_dev *dev = file->private_data;
262
263         return videobuf_querybuf(&dev->empress_tsq, b);
264 }
265
266 static int empress_qbuf(struct file *file, void *priv, struct v4l2_buffer *b)
267 {
268         struct saa7134_dev *dev = file->private_data;
269
270         return videobuf_qbuf(&dev->empress_tsq, b);
271 }
272
273 static int empress_dqbuf(struct file *file, void *priv, struct v4l2_buffer *b)
274 {
275         struct saa7134_dev *dev = file->private_data;
276
277         return videobuf_dqbuf(&dev->empress_tsq, b,
278                                 file->f_flags & O_NONBLOCK);
279 }
280
281 static int empress_streamon(struct file *file, void *priv,
282                                         enum v4l2_buf_type type)
283 {
284         struct saa7134_dev *dev = file->private_data;
285
286         return videobuf_streamon(&dev->empress_tsq);
287 }
288
289 static int empress_streamoff(struct file *file, void *priv,
290                                         enum v4l2_buf_type type)
291 {
292         struct saa7134_dev *dev = file->private_data;
293
294         return videobuf_streamoff(&dev->empress_tsq);
295 }
296
297 static int empress_s_ext_ctrls(struct file *file, void *priv,
298                                struct v4l2_ext_controls *ctrls)
299 {
300         struct saa7134_dev *dev = file->private_data;
301
302         /* count == 0 is abused in saa6752hs.c, so that special
303                 case is handled here explicitly. */
304         if (ctrls->count == 0)
305                 return 0;
306
307         if (ctrls->ctrl_class != V4L2_CTRL_CLASS_MPEG)
308                 return -EINVAL;
309
310         saa7134_i2c_call_clients(dev, VIDIOC_S_EXT_CTRLS, ctrls);
311         ts_init_encoder(dev);
312
313         return 0;
314 }
315
316 static int empress_g_ext_ctrls(struct file *file, void *priv,
317                                struct v4l2_ext_controls *ctrls)
318 {
319         struct saa7134_dev *dev = file->private_data;
320
321         if (ctrls->ctrl_class != V4L2_CTRL_CLASS_MPEG)
322                 return -EINVAL;
323         saa7134_i2c_call_clients(dev, VIDIOC_G_EXT_CTRLS, ctrls);
324
325         return 0;
326 }
327
328 static const struct file_operations ts_fops =
329 {
330         .owner    = THIS_MODULE,
331         .open     = ts_open,
332         .release  = ts_release,
333         .read     = ts_read,
334         .poll     = ts_poll,
335         .mmap     = ts_mmap,
336         .ioctl    = video_ioctl2,
337         .llseek   = no_llseek,
338 };
339
340 /* ----------------------------------------------------------- */
341
342 static struct video_device saa7134_empress_template =
343 {
344         .name          = "saa7134-empress",
345         .type          = 0 /* FIXME */,
346         .type2         = 0 /* FIXME */,
347         .fops          = &ts_fops,
348         .minor         = -1,
349
350         .vidioc_querycap                = empress_querycap,
351         .vidioc_enum_fmt_cap            = empress_enum_fmt_cap,
352         .vidioc_s_fmt_cap               = empress_s_fmt_cap,
353         .vidioc_g_fmt_cap               = empress_g_fmt_cap,
354         .vidioc_reqbufs                 = empress_reqbufs,
355         .vidioc_querybuf                = empress_querybuf,
356         .vidioc_qbuf                    = empress_qbuf,
357         .vidioc_dqbuf                   = empress_dqbuf,
358         .vidioc_streamon                = empress_streamon,
359         .vidioc_streamoff               = empress_streamoff,
360         .vidioc_s_ext_ctrls             = empress_s_ext_ctrls,
361         .vidioc_g_ext_ctrls             = empress_g_ext_ctrls,
362         .vidioc_enum_input              = empress_enum_input,
363         .vidioc_g_input                 = empress_g_input,
364         .vidioc_s_input                 = empress_s_input,
365
366         .vidioc_queryctrl               = saa7134_queryctrl,
367         .vidioc_g_ctrl                  = saa7134_g_ctrl,
368         .vidioc_s_ctrl                  = saa7134_s_ctrl,
369
370         .tvnorms                        = SAA7134_NORMS,
371         .current_norm                   = V4L2_STD_PAL,
372 };
373
374 static void empress_signal_update(struct work_struct *work)
375 {
376         struct saa7134_dev* dev =
377                 container_of(work, struct saa7134_dev, empress_workqueue);
378
379         if (dev->nosignal) {
380                 dprintk("no video signal\n");
381                 ts_reset_encoder(dev);
382         } else {
383                 dprintk("video signal acquired\n");
384                 if (dev->empress_users)
385                         ts_init_encoder(dev);
386         }
387 }
388
389 static void empress_signal_change(struct saa7134_dev *dev)
390 {
391         schedule_work(&dev->empress_workqueue);
392 }
393
394
395 static int empress_init(struct saa7134_dev *dev)
396 {
397         int err;
398
399         dprintk("%s: %s\n",dev->name,__func__);
400         dev->empress_dev = video_device_alloc();
401         if (NULL == dev->empress_dev)
402                 return -ENOMEM;
403         *(dev->empress_dev) = saa7134_empress_template;
404         dev->empress_dev->dev     = &dev->pci->dev;
405         dev->empress_dev->release = video_device_release;
406         snprintf(dev->empress_dev->name, sizeof(dev->empress_dev->name),
407                  "%s empress (%s)", dev->name,
408                  saa7134_boards[dev->board].name);
409
410         INIT_WORK(&dev->empress_workqueue, empress_signal_update);
411
412         err = video_register_device(dev->empress_dev,VFL_TYPE_GRABBER,
413                                     empress_nr[dev->nr]);
414         if (err < 0) {
415                 printk(KERN_INFO "%s: can't register video device\n",
416                        dev->name);
417                 video_device_release(dev->empress_dev);
418                 dev->empress_dev = NULL;
419                 return err;
420         }
421         printk(KERN_INFO "%s: registered device video%d [mpeg]\n",
422                dev->name,dev->empress_dev->minor & 0x1f);
423
424         videobuf_queue_sg_init(&dev->empress_tsq, &saa7134_ts_qops,
425                             &dev->pci->dev, &dev->slock,
426                             V4L2_BUF_TYPE_VIDEO_CAPTURE,
427                             V4L2_FIELD_ALTERNATE,
428                             sizeof(struct saa7134_buf),
429                             dev);
430
431         empress_signal_update(&dev->empress_workqueue);
432         return 0;
433 }
434
435 static int empress_fini(struct saa7134_dev *dev)
436 {
437         dprintk("%s: %s\n",dev->name,__func__);
438
439         if (NULL == dev->empress_dev)
440                 return 0;
441         flush_scheduled_work();
442         video_unregister_device(dev->empress_dev);
443         dev->empress_dev = NULL;
444         return 0;
445 }
446
447 static struct saa7134_mpeg_ops empress_ops = {
448         .type          = SAA7134_MPEG_EMPRESS,
449         .init          = empress_init,
450         .fini          = empress_fini,
451         .signal_change = empress_signal_change,
452 };
453
454 static int __init empress_register(void)
455 {
456         return saa7134_ts_register(&empress_ops);
457 }
458
459 static void __exit empress_unregister(void)
460 {
461         saa7134_ts_unregister(&empress_ops);
462 }
463
464 module_init(empress_register);
465 module_exit(empress_unregister);
466
467 /* ----------------------------------------------------------- */
468 /*
469  * Local variables:
470  * c-basic-offset: 8
471  * End:
472  */