Commit a82200fb authored by Mauro Carvalho Chehab's avatar Mauro Carvalho Chehab
Browse files

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: default avatarMauro Carvalho Chehab <mchehab@infradead.org>
parent d6964aa8

drivers/media/video/tuner-xc2028.c

+35 −0
Original line number Diff line number Diff line
@@ -28,6 +28,20 @@ static int debug; 
module_param(debug, int, 0644);

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);

/* struct for storing firmware table */

struct firmware_description {
@@ -180,6 +194,24 @@ void dump_firm_type(unsigned int type) 
		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)

{

	int i;
@@ -613,6 +645,9 @@ static int check_firmware(struct dvb_frontend *fe, enum tuner_mode new_mode, 
		return 0;

	}



	/* Add audio hack to std mask */

	std |= parse_audio_std_option();



	rc = load_firmware(fe, type, &std);

	if (rc < 0)

		return rc;