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V4L/DVB (6605): Add a modprobe option to manually select audio standard 

While there's no public API to define audio standard, adds a hack option for
select them. This is needed only for NICAM and A2 firmwares, since AM, BTSC and
EAIJ are already properly handled, on firmware version 2.7.

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Mauro Carvalho Chehab 2007-11-15 11:58:00 -03:00
parent d6964aa8d4
commit a82200fb59
1 changed files with 35 additions and 0 deletions
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35
drivers/media/video/tuner-xc2028.c
View File

@ -28,6 +28,20 @@ static int debug;
module_param(debug, int, 0644); module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "enable verbose debug messages"); MODULE_PARM_DESC(debug, "enable verbose debug messages");
static char audio_std[8];
module_param_string(audio_std, audio_std, sizeof(audio_std), 0);
MODULE_PARM_DESC(audio_std,
"Audio standard. XC3028 audio decoder explicitly "
"needs to know what audio\n"
"standard is needed for some video standards with audio A2 or NICAM.\n"
"The valid values are:\n"
"A2\n"
"A2/A\n"
"A2/B\n"
"NICAM\n"
"NICAM/A\n"
"NICAM/B\n");
static LIST_HEAD(xc2028_list); static LIST_HEAD(xc2028_list);
/* struct for storing firmware table */ /* struct for storing firmware table */
struct firmware_description { struct firmware_description {
@ -180,6 +194,24 @@ void dump_firm_type(unsigned int type)
printk("SCODE "); printk("SCODE ");
} }
static v4l2_std_id parse_audio_std_option(void)
{
if (strcasecmp(audio_std, "A2"))
return V4L2_STD_A2;
if (strcasecmp(audio_std, "A2/A"))
return V4L2_STD_A2_A;
if (strcasecmp(audio_std, "A2/B"))
return V4L2_STD_A2_B;
if (strcasecmp(audio_std, "NICAM"))
return V4L2_STD_NICAM;
if (strcasecmp(audio_std, "NICAM/A"))
return V4L2_STD_NICAM_A;
if (strcasecmp(audio_std, "NICAM/B"))
return V4L2_STD_NICAM_B;
return 0;
}
static void free_firmware(struct xc2028_data *priv) static void free_firmware(struct xc2028_data *priv)
{ {
int i; int i;
@ -613,6 +645,9 @@ static int check_firmware(struct dvb_frontend *fe, enum tuner_mode new_mode,
return 0; return 0;
} }
/* Add audio hack to std mask */
std |= parse_audio_std_option();
rc = load_firmware(fe, type, &std); rc = load_firmware(fe, type, &std);
if (rc < 0) if (rc < 0)
return rc; return rc;