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V4L/DVB (11798): xc5000: add "no_poweroff" module option 

Provide for the ability for a user to disable putting the tuner to sleep, in
case he doesn't want to incur the cost of reloading the firmware when starting
up his/her application.  The module options are intentionally identical to
xc3028.

Signed-off-by: Devin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Devin Heitmueller 2009-04-28 13:53:38 -03:00 committed by Mauro Carvalho Chehab
parent 34a0db9202
commit b6bd5eb871
1 changed files with 10 additions and 0 deletions
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10
drivers/media/common/tuners/xc5000.c
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@ -36,6 +36,12 @@ static int debug;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
static int no_poweroff;
module_param(no_poweroff, int, 0644);
MODULE_PARM_DESC(no_poweroff, "0 (default) powers device off when not used.\n"
"\t\t1 keep device energized and with tuner ready all the times.\n"
"\t\tFaster, but consumes more power and keeps the device hotter");
static DEFINE_MUTEX(xc5000_list_mutex);
static LIST_HEAD(hybrid_tuner_instance_list);
@ -857,6 +863,10 @@ static int xc5000_sleep(struct dvb_frontend *fe)
dprintk(1, "%s()\n", __func__);
/* Avoid firmware reload on slow devices */
if (no_poweroff)
return 0;
/* According to Xceive technical support, the "powerdown" register
was removed in newer versions of the firmware. The "supported"
way to sleep the tuner is to pull the reset pin low for 10ms */