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Commit 5272f6b1 authored by Istvan Varga's avatar Istvan Varga Committed by Mauro Carvalho Chehab
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[media] xc4000: implemented power management 



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: default avatarIstvan Varga <istvan_v@mailbox.hu>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent 0b402132

drivers/media/common/tuners/xc4000.c

+34 −5
Original line number Diff line number Diff line
@@ -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)