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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * $Id: video-buf-dvb.c,v 1.7 2004/12/09 12:51:35 kraxel Exp $
3 *
4 * some helper function for simple DVB cards which simply DMA the
5 * complete transport stream and let the computer sort everything else
6 * (i.e. we are using the software demux, ...). Also uses the
7 * video-buf to manage DMA buffers.
8 *
9 * (c) 2004 Gerd Knorr <kraxel@bytesex.org> [SUSE Labs]
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 */
16
17#include <linux/module.h>
18#include <linux/init.h>
19#include <linux/device.h>
20#include <linux/fs.h>
21#include <linux/kthread.h>
22#include <linux/file.h>
23#include <linux/suspend.h>
24
25#include <media/video-buf.h>
26#include <media/video-buf-dvb.h>
27
28/* ------------------------------------------------------------------ */
29
30MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
31MODULE_LICENSE("GPL");
32
33static unsigned int debug = 0;
34module_param(debug, int, 0644);
35MODULE_PARM_DESC(debug,"enable debug messages");
36
37#define dprintk(fmt, arg...) if (debug) \
38 printk(KERN_DEBUG "%s/dvb: " fmt, dvb->name , ## arg)
39
40/* ------------------------------------------------------------------ */
41
42static int videobuf_dvb_thread(void *data)
43{
44 struct videobuf_dvb *dvb = data;
45 struct videobuf_buffer *buf;
46 unsigned long flags;
47 int err;
48
49 dprintk("dvb thread started\n");
50 videobuf_read_start(&dvb->dvbq);
51
52 for (;;) {
53 /* fetch next buffer */
54 buf = list_entry(dvb->dvbq.stream.next,
55 struct videobuf_buffer, stream);
56 list_del(&buf->stream);
57 err = videobuf_waiton(buf,0,1);
58 BUG_ON(0 != err);
59
60 /* no more feeds left or stop_feed() asked us to quit */
61 if (0 == dvb->nfeeds)
62 break;
63 if (kthread_should_stop())
64 break;
65 if (current->flags & PF_FREEZE)
66 refrigerator(PF_FREEZE);
67
68 /* feed buffer data to demux */
69 if (buf->state == STATE_DONE)
70 dvb_dmx_swfilter(&dvb->demux, buf->dma.vmalloc,
71 buf->size);
72
73 /* requeue buffer */
74 list_add_tail(&buf->stream,&dvb->dvbq.stream);
75 spin_lock_irqsave(dvb->dvbq.irqlock,flags);
76 dvb->dvbq.ops->buf_queue(&dvb->dvbq,buf);
77 spin_unlock_irqrestore(dvb->dvbq.irqlock,flags);
78 }
79
80 videobuf_read_stop(&dvb->dvbq);
81 dprintk("dvb thread stopped\n");
82
83 /* Hmm, linux becomes *very* unhappy without this ... */
84 while (!kthread_should_stop()) {
85 set_current_state(TASK_INTERRUPTIBLE);
86 schedule();
87 }
88 return 0;
89}
90
91static int videobuf_dvb_start_feed(struct dvb_demux_feed *feed)
92{
93 struct dvb_demux *demux = feed->demux;
94 struct videobuf_dvb *dvb = demux->priv;
95 int rc;
96
97 if (!demux->dmx.frontend)
98 return -EINVAL;
99
100 down(&dvb->lock);
101 dvb->nfeeds++;
102 rc = dvb->nfeeds;
103
104 if (NULL != dvb->thread)
105 goto out;
106 dvb->thread = kthread_run(videobuf_dvb_thread,
107 dvb, "%s dvb", dvb->name);
108 if (IS_ERR(dvb->thread)) {
109 rc = PTR_ERR(dvb->thread);
110 dvb->thread = NULL;
111 }
112
113out:
114 up(&dvb->lock);
115 return rc;
116}
117
118static int videobuf_dvb_stop_feed(struct dvb_demux_feed *feed)
119{
120 struct dvb_demux *demux = feed->demux;
121 struct videobuf_dvb *dvb = demux->priv;
122 int err = 0;
123
124 down(&dvb->lock);
125 dvb->nfeeds--;
126 if (0 == dvb->nfeeds && NULL != dvb->thread) {
127 // FIXME: cx8802_cancel_buffers(dev);
128 err = kthread_stop(dvb->thread);
129 dvb->thread = NULL;
130 }
131 up(&dvb->lock);
132 return err;
133}
134
135/* ------------------------------------------------------------------ */
136
137int videobuf_dvb_register(struct videobuf_dvb *dvb,
138 struct module *module,
139 void *adapter_priv)
140{
141 int result;
142
143 init_MUTEX(&dvb->lock);
144
145 /* register adapter */
146 result = dvb_register_adapter(&dvb->adapter, dvb->name, module);
147 if (result < 0) {
148 printk(KERN_WARNING "%s: dvb_register_adapter failed (errno = %d)\n",
149 dvb->name, result);
150 goto fail_adapter;
151 }
Johannes Stezenbachfdc53a62005-05-16 21:54:39 -0700152 dvb->adapter.priv = adapter_priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153
154 /* register frontend */
Johannes Stezenbachfdc53a62005-05-16 21:54:39 -0700155 result = dvb_register_frontend(&dvb->adapter, dvb->frontend);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 if (result < 0) {
157 printk(KERN_WARNING "%s: dvb_register_frontend failed (errno = %d)\n",
158 dvb->name, result);
159 goto fail_frontend;
160 }
161
162 /* register demux stuff */
163 dvb->demux.dmx.capabilities =
164 DMX_TS_FILTERING | DMX_SECTION_FILTERING |
165 DMX_MEMORY_BASED_FILTERING;
166 dvb->demux.priv = dvb;
167 dvb->demux.filternum = 256;
168 dvb->demux.feednum = 256;
169 dvb->demux.start_feed = videobuf_dvb_start_feed;
170 dvb->demux.stop_feed = videobuf_dvb_stop_feed;
171 result = dvb_dmx_init(&dvb->demux);
172 if (result < 0) {
173 printk(KERN_WARNING "%s: dvb_dmx_init failed (errno = %d)\n",
174 dvb->name, result);
175 goto fail_dmx;
176 }
177
178 dvb->dmxdev.filternum = 256;
179 dvb->dmxdev.demux = &dvb->demux.dmx;
180 dvb->dmxdev.capabilities = 0;
Johannes Stezenbachfdc53a62005-05-16 21:54:39 -0700181 result = dvb_dmxdev_init(&dvb->dmxdev, &dvb->adapter);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 if (result < 0) {
183 printk(KERN_WARNING "%s: dvb_dmxdev_init failed (errno = %d)\n",
184 dvb->name, result);
185 goto fail_dmxdev;
186 }
187
188 dvb->fe_hw.source = DMX_FRONTEND_0;
189 result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_hw);
190 if (result < 0) {
191 printk(KERN_WARNING "%s: add_frontend failed (DMX_FRONTEND_0, errno = %d)\n",
192 dvb->name, result);
193 goto fail_fe_hw;
194 }
195
196 dvb->fe_mem.source = DMX_MEMORY_FE;
197 result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_mem);
198 if (result < 0) {
199 printk(KERN_WARNING "%s: add_frontend failed (DMX_MEMORY_FE, errno = %d)\n",
200 dvb->name, result);
201 goto fail_fe_mem;
202 }
203
204 result = dvb->demux.dmx.connect_frontend(&dvb->demux.dmx, &dvb->fe_hw);
205 if (result < 0) {
206 printk(KERN_WARNING "%s: connect_frontend failed (errno = %d)\n",
207 dvb->name, result);
208 goto fail_fe_conn;
209 }
210
211 /* register network adapter */
Johannes Stezenbachfdc53a62005-05-16 21:54:39 -0700212 dvb_net_init(&dvb->adapter, &dvb->net, &dvb->demux.dmx);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 return 0;
214
215fail_fe_conn:
216 dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
217fail_fe_mem:
218 dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
219fail_fe_hw:
220 dvb_dmxdev_release(&dvb->dmxdev);
221fail_dmxdev:
222 dvb_dmx_release(&dvb->demux);
223fail_dmx:
224 dvb_unregister_frontend(dvb->frontend);
225fail_frontend:
Johannes Stezenbachfdc53a62005-05-16 21:54:39 -0700226 dvb_unregister_adapter(&dvb->adapter);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227fail_adapter:
228 return result;
229}
230
231void videobuf_dvb_unregister(struct videobuf_dvb *dvb)
232{
233 dvb_net_release(&dvb->net);
234 dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
235 dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
236 dvb_dmxdev_release(&dvb->dmxdev);
237 dvb_dmx_release(&dvb->demux);
238 dvb_unregister_frontend(dvb->frontend);
Johannes Stezenbachfdc53a62005-05-16 21:54:39 -0700239 dvb_unregister_adapter(&dvb->adapter);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240}
241
242EXPORT_SYMBOL(videobuf_dvb_register);
243EXPORT_SYMBOL(videobuf_dvb_unregister);
244
245/* ------------------------------------------------------------------ */
246/*
247 * Local variables:
248 * c-basic-offset: 8
249 * compile-command: "make DVB=1"
250 * End:
251 */