tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 *
3 * some helper function for simple DVB cards which simply DMA the
4 * complete transport stream and let the computer sort everything else
5 * (i.e. we are using the software demux, ...). Also uses the
6 * video-buf to manage DMA buffers.
7 *
8 * (c) 2004 Gerd Knorr <kraxel@bytesex.org> [SUSE Labs]
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 */
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/freezer.h>
24
25#include <media/videobuf-dma-sg.h>
26#include <media/videobuf-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 struct videobuf_dmabuf *dma;
49
50 dprintk("dvb thread started\n");
51 set_freezable();
52 videobuf_read_start(&dvb->dvbq);
53
54 for (;;) {
55 /* fetch next buffer */
56 buf = list_entry(dvb->dvbq.stream.next,
57 struct videobuf_buffer, stream);
58 list_del(&buf->stream);
59 err = videobuf_waiton(buf,0,1);
60
61 /* no more feeds left or stop_feed() asked us to quit */
62 if (0 == dvb->nfeeds)
63 break;
64 if (kthread_should_stop())
65 break;
66 try_to_freeze();
67
68 /* feed buffer data to demux */
69 dma=videobuf_to_dma(buf);
70 if (buf->state == VIDEOBUF_DONE)
71 dvb_dmx_swfilter(&dvb->demux, dma->vmalloc,
72 buf->size);
73
74 /* requeue buffer */
75 list_add_tail(&buf->stream,&dvb->dvbq.stream);
76 spin_lock_irqsave(dvb->dvbq.irqlock,flags);
77 dvb->dvbq.ops->buf_queue(&dvb->dvbq,buf);
78 spin_unlock_irqrestore(dvb->dvbq.irqlock,flags);
79 }
80
81 videobuf_read_stop(&dvb->dvbq);
82 dprintk("dvb thread stopped\n");
83
84 /* Hmm, linux becomes *very* unhappy without this ... */
85 while (!kthread_should_stop()) {
86 set_current_state(TASK_INTERRUPTIBLE);
87 schedule();
88 }
89 return 0;
90}
91
92static int videobuf_dvb_start_feed(struct dvb_demux_feed *feed)
93{
94 struct dvb_demux *demux = feed->demux;
95 struct videobuf_dvb *dvb = demux->priv;
96 int rc;
97
98 if (!demux->dmx.frontend)
99 return -EINVAL;
100
101 mutex_lock(&dvb->lock);
102 dvb->nfeeds++;
103 rc = dvb->nfeeds;
104
105 if (NULL != dvb->thread)
106 goto out;
107 dvb->thread = kthread_run(videobuf_dvb_thread,
108 dvb, "%s dvb", dvb->name);
109 if (IS_ERR(dvb->thread)) {
110 rc = PTR_ERR(dvb->thread);
111 dvb->thread = NULL;
112 }
113
114out:
115 mutex_unlock(&dvb->lock);
116 return rc;
117}
118
119static int videobuf_dvb_stop_feed(struct dvb_demux_feed *feed)
120{
121 struct dvb_demux *demux = feed->demux;
122 struct videobuf_dvb *dvb = demux->priv;
123 int err = 0;
124
125 mutex_lock(&dvb->lock);
126 dvb->nfeeds--;
127 if (0 == dvb->nfeeds && NULL != dvb->thread) {
128 // FIXME: cx8802_cancel_buffers(dev);
129 err = kthread_stop(dvb->thread);
130 dvb->thread = NULL;
131 }
132 mutex_unlock(&dvb->lock);
133 return err;
134}
135
136/* ------------------------------------------------------------------ */
137
138int videobuf_dvb_register(struct videobuf_dvb *dvb,
139 struct module *module,
140 void *adapter_priv,
141 struct device *device)
142{
143 int result;
144
145 mutex_init(&dvb->lock);
146
147 /* register adapter */
148 result = dvb_register_adapter(&dvb->adapter, dvb->name, module, device);
149 if (result < 0) {
150 printk(KERN_WARNING "%s: dvb_register_adapter failed (errno = %d)\n",
151 dvb->name, result);
152 goto fail_adapter;
153 }
154 dvb->adapter.priv = adapter_priv;
155
156 /* register frontend */
157 result = dvb_register_frontend(&dvb->adapter, dvb->frontend);
158 if (result < 0) {
159 printk(KERN_WARNING "%s: dvb_register_frontend failed (errno = %d)\n",
160 dvb->name, result);
161 goto fail_frontend;
162 }
163
164 /* register demux stuff */
165 dvb->demux.dmx.capabilities =
166 DMX_TS_FILTERING | DMX_SECTION_FILTERING |
167 DMX_MEMORY_BASED_FILTERING;
168 dvb->demux.priv = dvb;
169 dvb->demux.filternum = 256;
170 dvb->demux.feednum = 256;
171 dvb->demux.start_feed = videobuf_dvb_start_feed;
172 dvb->demux.stop_feed = videobuf_dvb_stop_feed;
173 result = dvb_dmx_init(&dvb->demux);
174 if (result < 0) {
175 printk(KERN_WARNING "%s: dvb_dmx_init failed (errno = %d)\n",
176 dvb->name, result);
177 goto fail_dmx;
178 }
179
180 dvb->dmxdev.filternum = 256;
181 dvb->dmxdev.demux = &dvb->demux.dmx;
182 dvb->dmxdev.capabilities = 0;
183 result = dvb_dmxdev_init(&dvb->dmxdev, &dvb->adapter);
184 if (result < 0) {
185 printk(KERN_WARNING "%s: dvb_dmxdev_init failed (errno = %d)\n",
186 dvb->name, result);
187 goto fail_dmxdev;
188 }
189
190 dvb->fe_hw.source = DMX_FRONTEND_0;
191 result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_hw);
192 if (result < 0) {
193 printk(KERN_WARNING "%s: add_frontend failed (DMX_FRONTEND_0, errno = %d)\n",
194 dvb->name, result);
195 goto fail_fe_hw;
196 }
197
198 dvb->fe_mem.source = DMX_MEMORY_FE;
199 result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_mem);
200 if (result < 0) {
201 printk(KERN_WARNING "%s: add_frontend failed (DMX_MEMORY_FE, errno = %d)\n",
202 dvb->name, result);
203 goto fail_fe_mem;
204 }
205
206 result = dvb->demux.dmx.connect_frontend(&dvb->demux.dmx, &dvb->fe_hw);
207 if (result < 0) {
208 printk(KERN_WARNING "%s: connect_frontend failed (errno = %d)\n",
209 dvb->name, result);
210 goto fail_fe_conn;
211 }
212
213 /* register network adapter */
214 dvb_net_init(&dvb->adapter, &dvb->net, &dvb->demux.dmx);
215 return 0;
216
217fail_fe_conn:
218 dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
219fail_fe_mem:
220 dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
221fail_fe_hw:
222 dvb_dmxdev_release(&dvb->dmxdev);
223fail_dmxdev:
224 dvb_dmx_release(&dvb->demux);
225fail_dmx:
226 dvb_unregister_frontend(dvb->frontend);
227fail_frontend:
228 dvb_frontend_detach(dvb->frontend);
229 dvb_unregister_adapter(&dvb->adapter);
230fail_adapter:
231 return result;
232}
233
234void videobuf_dvb_unregister(struct videobuf_dvb *dvb)
235{
236 dvb_net_release(&dvb->net);
237 dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
238 dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
239 dvb_dmxdev_release(&dvb->dmxdev);
240 dvb_dmx_release(&dvb->demux);
241 dvb_unregister_frontend(dvb->frontend);
242 dvb_frontend_detach(dvb->frontend);
243 dvb_unregister_adapter(&dvb->adapter);
244}
245
246EXPORT_SYMBOL(videobuf_dvb_register);
247EXPORT_SYMBOL(videobuf_dvb_unregister);
248
249/* ------------------------------------------------------------------ */
250/*
251 * Local variables:
252 * c-basic-offset: 8
253 * compile-command: "make DVB=1"
254 * End:
255 */
256