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linux/drivers/media/video/pvrusb2/pvrusb2-audio.c
Mike Isely f5174af201 V4L/DVB (6698): pvrusb2: Implement signal routing schemes 
The exact routing of video and audio signals within a device is a
device-specific attribute.  Hauppauge devices do it one way; other
types of device may route things differently.  Unfortunately it is
rather impractical to define chip-specific routing at the device
attribute level, so instead what happens here is that "schemes" are
defined.  Each chip level interface implements its part of a given
scheme and the scheme as a whole is made into a device specific
attribute controlled via a table entry in pvrusb2-devattr.c.  The only
scheme defined here is for Hauppauge devices, but clearly this opens
the door for other possibilities to follow.

Signed-off-by: Mike Isely <isely@pobox.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-01-25 19:03:05 -02:00

193 lines
4.9 KiB
C
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/*
*
* $Id$
*
* Copyright (C) 2005 Mike Isely <isely@pobox.com>
* Copyright (C) 2004 Aurelien Alleaume <slts@free.fr>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include "pvrusb2-audio.h"
#include "pvrusb2-hdw-internal.h"
#include "pvrusb2-debug.h"
#include <linux/videodev2.h>
#include <media/msp3400.h>
#include <media/v4l2-common.h>
struct pvr2_msp3400_handler {
struct pvr2_hdw *hdw;
struct pvr2_i2c_client *client;
struct pvr2_i2c_handler i2c_handler;
unsigned long stale_mask;
};
struct routing_scheme {
const int *def;
unsigned int cnt;
};
static const int routing_scheme0[] = {
[PVR2_CVAL_INPUT_TV] = MSP_INPUT_DEFAULT,
[PVR2_CVAL_INPUT_RADIO] = MSP_INPUT(MSP_IN_SCART2,
MSP_IN_TUNER1,
MSP_DSP_IN_SCART,
MSP_DSP_IN_SCART),
[PVR2_CVAL_INPUT_COMPOSITE] = MSP_INPUT(MSP_IN_SCART1,
MSP_IN_TUNER1,
MSP_DSP_IN_SCART,
MSP_DSP_IN_SCART),
[PVR2_CVAL_INPUT_SVIDEO] = MSP_INPUT(MSP_IN_SCART1,
MSP_IN_TUNER1,
MSP_DSP_IN_SCART,
MSP_DSP_IN_SCART),
};
static const struct routing_scheme routing_schemes[] = {
[PVR2_ROUTING_SCHEME_HAUPPAUGE] = {
.def = routing_scheme0,
.cnt = ARRAY_SIZE(routing_scheme0),
},
};
/* This function selects the correct audio input source */
static void set_stereo(struct pvr2_msp3400_handler *ctxt)
{
struct pvr2_hdw *hdw = ctxt->hdw;
struct v4l2_routing route;
const struct routing_scheme *sp;
unsigned int sid = hdw->hdw_desc->signal_routing_scheme;
pvr2_trace(PVR2_TRACE_CHIPS,"i2c msp3400 v4l2 set_stereo");
if ((sid < ARRAY_SIZE(routing_schemes)) &&
((sp = routing_schemes + sid) != 0) &&
(hdw->input_val >= 0) &&
(hdw->input_val < sp->cnt)) {
route.input = sp->def[hdw->input_val];
} else {
pvr2_trace(PVR2_TRACE_ERROR_LEGS,
"*** WARNING *** i2c msp3400 v4l2 set_stereo:"
" Invalid routing scheme (%u) and/or input (%d)",
sid,hdw->input_val);
return;
}
route.output = MSP_OUTPUT(MSP_SC_IN_DSP_SCART1);
pvr2_i2c_client_cmd(ctxt->client,VIDIOC_INT_S_AUDIO_ROUTING,&route);
}
static int check_stereo(struct pvr2_msp3400_handler *ctxt)
{
struct pvr2_hdw *hdw = ctxt->hdw;
return hdw->input_dirty;
}
struct pvr2_msp3400_ops {
void (*update)(struct pvr2_msp3400_handler *);
int (*check)(struct pvr2_msp3400_handler *);
};
static const struct pvr2_msp3400_ops msp3400_ops[] = {
{ .update = set_stereo, .check = check_stereo},
};
static int msp3400_check(struct pvr2_msp3400_handler *ctxt)
{
unsigned long msk;
unsigned int idx;
for (idx = 0; idx < ARRAY_SIZE(msp3400_ops); idx++) {
msk = 1 << idx;
if (ctxt->stale_mask & msk) continue;
if (msp3400_ops[idx].check(ctxt)) {
ctxt->stale_mask |= msk;
}
}
return ctxt->stale_mask != 0;
}
static void msp3400_update(struct pvr2_msp3400_handler *ctxt)
{
unsigned long msk;
unsigned int idx;
for (idx = 0; idx < ARRAY_SIZE(msp3400_ops); idx++) {
msk = 1 << idx;
if (!(ctxt->stale_mask & msk)) continue;
ctxt->stale_mask &= ~msk;
msp3400_ops[idx].update(ctxt);
}
}
static void pvr2_msp3400_detach(struct pvr2_msp3400_handler *ctxt)
{
ctxt->client->handler = NULL;
kfree(ctxt);
}
static unsigned int pvr2_msp3400_describe(struct pvr2_msp3400_handler *ctxt,
char *buf,unsigned int cnt)
{
return scnprintf(buf,cnt,"handler: pvrusb2-audio v4l2");
}
static const struct pvr2_i2c_handler_functions msp3400_funcs = {
.detach = (void (*)(void *))pvr2_msp3400_detach,
.check = (int (*)(void *))msp3400_check,
.update = (void (*)(void *))msp3400_update,
.describe = (unsigned int (*)(void *,char *,unsigned int))pvr2_msp3400_describe,
};
int pvr2_i2c_msp3400_setup(struct pvr2_hdw *hdw,struct pvr2_i2c_client *cp)
{
struct pvr2_msp3400_handler *ctxt;
if (cp->handler) return 0;
ctxt = kzalloc(sizeof(*ctxt),GFP_KERNEL);
if (!ctxt) return 0;
ctxt->i2c_handler.func_data = ctxt;
ctxt->i2c_handler.func_table = &msp3400_funcs;
ctxt->client = cp;
ctxt->hdw = hdw;
ctxt->stale_mask = (1 << ARRAY_SIZE(msp3400_ops)) - 1;
cp->handler = &ctxt->i2c_handler;
pvr2_trace(PVR2_TRACE_CHIPS,"i2c 0x%x msp3400 V4L2 handler set up",
cp->client->addr);
return !0;
}
/*
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*/
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