Merge branch 'linus' into core/rcu
[linux-2.6] / drivers / media / video / pvrusb2 / pvrusb2-video-v4l.c
1 /*
2  *
3  *
4  *  Copyright (C) 2005 Mike Isely <isely@pobox.com>
5  *  Copyright (C) 2004 Aurelien Alleaume <slts@free.fr>
6  *
7  *  This program is free software; you can redistribute it and/or modify
8  *  it under the terms of the GNU General Public License as published by
9  *  the Free Software Foundation; either version 2 of the License
10  *
11  *  This program is distributed in the hope that it will be useful,
12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  *  GNU General Public License for more details.
15  *
16  *  You should have received a copy of the GNU General Public License
17  *  along with this program; if not, write to the Free Software
18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
19  *
20  */
21
22 /*
23
24    This source file is specifically designed to interface with the
25    saa711x support that is available in the v4l available starting
26    with linux 2.6.15.
27
28 */
29
30 #include "pvrusb2-video-v4l.h"
31 #include "pvrusb2-i2c-cmd-v4l2.h"
32
33
34 #include "pvrusb2-hdw-internal.h"
35 #include "pvrusb2-debug.h"
36 #include <linux/videodev2.h>
37 #include <media/v4l2-common.h>
38 #include <media/saa7115.h>
39 #include <linux/errno.h>
40 #include <linux/slab.h>
41
42 struct pvr2_v4l_decoder {
43         struct pvr2_i2c_handler handler;
44         struct pvr2_decoder_ctrl ctrl;
45         struct pvr2_i2c_client *client;
46         struct pvr2_hdw *hdw;
47         unsigned long stale_mask;
48 };
49
50
51 struct routing_scheme {
52         const int *def;
53         unsigned int cnt;
54 };
55
56
57 static const int routing_scheme0[] = {
58         [PVR2_CVAL_INPUT_TV] = SAA7115_COMPOSITE4,
59         /* In radio mode, we mute the video, but point at one
60            spot just to stay consistent */
61         [PVR2_CVAL_INPUT_RADIO] = SAA7115_COMPOSITE5,
62         [PVR2_CVAL_INPUT_COMPOSITE] = SAA7115_COMPOSITE5,
63         [PVR2_CVAL_INPUT_SVIDEO] =  SAA7115_SVIDEO2,
64 };
65
66 static const struct routing_scheme routing_schemes[] = {
67         [PVR2_ROUTING_SCHEME_HAUPPAUGE] = {
68                 .def = routing_scheme0,
69                 .cnt = ARRAY_SIZE(routing_scheme0),
70         },
71 };
72
73 static void set_input(struct pvr2_v4l_decoder *ctxt)
74 {
75         struct pvr2_hdw *hdw = ctxt->hdw;
76         struct v4l2_routing route;
77         const struct routing_scheme *sp;
78         unsigned int sid = hdw->hdw_desc->signal_routing_scheme;
79
80         pvr2_trace(PVR2_TRACE_CHIPS,"i2c v4l2 set_input(%d)",hdw->input_val);
81
82         if ((sid < ARRAY_SIZE(routing_schemes)) &&
83             ((sp = routing_schemes + sid) != NULL) &&
84             (hdw->input_val >= 0) &&
85             (hdw->input_val < sp->cnt)) {
86                 route.input = sp->def[hdw->input_val];
87         } else {
88                 pvr2_trace(PVR2_TRACE_ERROR_LEGS,
89                            "*** WARNING *** i2c v4l2 set_input:"
90                            " Invalid routing scheme (%u) and/or input (%d)",
91                            sid,hdw->input_val);
92                 return;
93         }
94
95         route.output = 0;
96         pvr2_i2c_client_cmd(ctxt->client,VIDIOC_INT_S_VIDEO_ROUTING,&route);
97 }
98
99
100 static int check_input(struct pvr2_v4l_decoder *ctxt)
101 {
102         struct pvr2_hdw *hdw = ctxt->hdw;
103         return hdw->input_dirty != 0;
104 }
105
106
107 static void set_audio(struct pvr2_v4l_decoder *ctxt)
108 {
109         u32 val;
110         struct pvr2_hdw *hdw = ctxt->hdw;
111
112         pvr2_trace(PVR2_TRACE_CHIPS,"i2c v4l2 set_audio %d",
113                    hdw->srate_val);
114         switch (hdw->srate_val) {
115         default:
116         case V4L2_MPEG_AUDIO_SAMPLING_FREQ_48000:
117                 val = 48000;
118                 break;
119         case V4L2_MPEG_AUDIO_SAMPLING_FREQ_44100:
120                 val = 44100;
121                 break;
122         case V4L2_MPEG_AUDIO_SAMPLING_FREQ_32000:
123                 val = 32000;
124                 break;
125         }
126         pvr2_i2c_client_cmd(ctxt->client,VIDIOC_INT_AUDIO_CLOCK_FREQ,&val);
127 }
128
129
130 static int check_audio(struct pvr2_v4l_decoder *ctxt)
131 {
132         struct pvr2_hdw *hdw = ctxt->hdw;
133         return hdw->srate_dirty != 0;
134 }
135
136
137 struct pvr2_v4l_decoder_ops {
138         void (*update)(struct pvr2_v4l_decoder *);
139         int (*check)(struct pvr2_v4l_decoder *);
140 };
141
142
143 static const struct pvr2_v4l_decoder_ops decoder_ops[] = {
144         { .update = set_input, .check = check_input},
145         { .update = set_audio, .check = check_audio},
146 };
147
148
149 static void decoder_detach(struct pvr2_v4l_decoder *ctxt)
150 {
151         ctxt->client->handler = NULL;
152         pvr2_hdw_set_decoder(ctxt->hdw,NULL);
153         kfree(ctxt);
154 }
155
156
157 static int decoder_check(struct pvr2_v4l_decoder *ctxt)
158 {
159         unsigned long msk;
160         unsigned int idx;
161
162         for (idx = 0; idx < ARRAY_SIZE(decoder_ops); idx++) {
163                 msk = 1 << idx;
164                 if (ctxt->stale_mask & msk) continue;
165                 if (decoder_ops[idx].check(ctxt)) {
166                         ctxt->stale_mask |= msk;
167                 }
168         }
169         return ctxt->stale_mask != 0;
170 }
171
172
173 static void decoder_update(struct pvr2_v4l_decoder *ctxt)
174 {
175         unsigned long msk;
176         unsigned int idx;
177
178         for (idx = 0; idx < ARRAY_SIZE(decoder_ops); idx++) {
179                 msk = 1 << idx;
180                 if (!(ctxt->stale_mask & msk)) continue;
181                 ctxt->stale_mask &= ~msk;
182                 decoder_ops[idx].update(ctxt);
183         }
184 }
185
186
187 static int decoder_detect(struct pvr2_i2c_client *cp)
188 {
189         /* Attempt to query the decoder - let's see if it will answer */
190         struct v4l2_tuner vt;
191         int ret;
192
193         memset(&vt,0,sizeof(vt));
194         ret = pvr2_i2c_client_cmd(cp,VIDIOC_G_TUNER,&vt);
195         return ret == 0; /* Return true if it answered */
196 }
197
198
199 static void decoder_enable(struct pvr2_v4l_decoder *ctxt,int fl)
200 {
201         pvr2_trace(PVR2_TRACE_CHIPS,"i2c v4l2 decoder_enable(%d)",fl);
202         pvr2_v4l2_cmd_stream(ctxt->client,fl);
203 }
204
205
206 static unsigned int decoder_describe(struct pvr2_v4l_decoder *ctxt,char *buf,unsigned int cnt)
207 {
208         return scnprintf(buf,cnt,"handler: pvrusb2-video-v4l");
209 }
210
211
212 static const struct pvr2_i2c_handler_functions hfuncs = {
213         .detach = (void (*)(void *))decoder_detach,
214         .check = (int (*)(void *))decoder_check,
215         .update = (void (*)(void *))decoder_update,
216         .describe = (unsigned int (*)(void *,char *,unsigned int))decoder_describe,
217 };
218
219
220 int pvr2_i2c_decoder_v4l_setup(struct pvr2_hdw *hdw,
221                                struct pvr2_i2c_client *cp)
222 {
223         struct pvr2_v4l_decoder *ctxt;
224
225         if (hdw->decoder_ctrl) return 0;
226         if (cp->handler) return 0;
227         if (!decoder_detect(cp)) return 0;
228
229         ctxt = kzalloc(sizeof(*ctxt),GFP_KERNEL);
230         if (!ctxt) return 0;
231
232         ctxt->handler.func_data = ctxt;
233         ctxt->handler.func_table = &hfuncs;
234         ctxt->ctrl.ctxt = ctxt;
235         ctxt->ctrl.detach = (void (*)(void *))decoder_detach;
236         ctxt->ctrl.enable = (void (*)(void *,int))decoder_enable;
237         ctxt->client = cp;
238         ctxt->hdw = hdw;
239         ctxt->stale_mask = (1 << ARRAY_SIZE(decoder_ops)) - 1;
240         pvr2_hdw_set_decoder(hdw,&ctxt->ctrl);
241         cp->handler = &ctxt->handler;
242         pvr2_trace(PVR2_TRACE_CHIPS,"i2c 0x%x saa711x V4L2 handler set up",
243                    cp->client->addr);
244         return !0;
245 }
246
247
248
249
250 /*
251   Stuff for Emacs to see, in order to encourage consistent editing style:
252   *** Local Variables: ***
253   *** mode: c ***
254   *** fill-column: 70 ***
255   *** tab-width: 8 ***
256   *** c-basic-offset: 8 ***
257   *** End: ***
258   */