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[media] xc4000: implemented power management

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The following patch implements the xc4000_sleep() function.
The 'no_powerdown' module parameter is now interpreted differently:
  - 0 uses a device-specific default
  - 1 disables power management like before
  - 2 enables power management

Signed-off-by: Istvan Varga <istvan_v@mailbox.hu>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Istvan Varga 2011-06-04 12:03:03 -03:00 committed by Mauro Carvalho Chehab
parent 0b4021321c
commit 5272f6b1f4
1 changed files with 34 additions and 5 deletions
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39
drivers/media/common/tuners/xc4000.c
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@ -43,9 +43,11 @@ 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");
MODULE_PARM_DESC(no_poweroff, "\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.\n"
"\t\t2: powers device off when not used.\n"
"\t\t0 (default): use device-specific default mode.");
#define XC4000_DEFAULT_FIRMWARE "xc4000.fw"
@ -102,6 +104,7 @@ struct xc4000_priv {
/* Misc Defines */
#define MAX_TV_STANDARD 24
#define XC_MAX_I2C_WRITE_LENGTH 64
#define XC_POWERED_DOWN 0x80000000U
/* Signal Types */
#define XC_RF_MODE_AIR 0
@ -1365,8 +1368,34 @@ static int xc4000_get_status(struct dvb_frontend *fe, u32 *status)
static int xc4000_sleep(struct dvb_frontend *fe)
{
/* FIXME: djh disable this for now... */
return XC_RESULT_SUCCESS;
struct xc4000_priv *priv = fe->tuner_priv;
int ret = XC_RESULT_SUCCESS;
dprintk(1, "%s()\n", __func__);
mutex_lock(&priv->lock);
/* Avoid firmware reload on slow devices */
if ((no_poweroff == 2 ||
(no_poweroff == 0 &&
priv->card_type != XC4000_CARD_WINFAST_CX88)) &&
(priv->cur_fw.type & BASE) != 0) {
/* force reset and firmware reload */
priv->cur_fw.type = XC_POWERED_DOWN;
if (xc_write_reg(priv, XREG_POWER_DOWN, 0)
!= XC_RESULT_SUCCESS) {
printk(KERN_ERR
"xc4000: %s() unable to shutdown tuner\n",
__func__);
ret = -EREMOTEIO;
}
xc_wait(20);
}
mutex_unlock(&priv->lock);
return ret;
}
static int xc4000_init(struct dvb_frontend *fe)