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Commit b6907b0c authored by Daniel Mack's avatar Daniel Mack Committed by David S. Miller
Browse files

net: smsc911x: add power management functions 



This adds a power management implementation for smsc911x.c which assumes
the chips remains powered during suspend. The device is put in its D1
power saving mode.

Signed-off-by: default avatarDaniel Mack <daniel@caiaq.de>
Acked-by: default avatarSteve Glendinning <steve.glendinning@smsc.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c7ae011d

drivers/net/smsc911x.c

+46 −0
Original line number Original line Diff line number Diff line
@@ -2109,12 +2109,58 @@ static int __devinit smsc911x_drv_probe(struct platform_device *pdev) 
	return retval;

	return retval;

}

}





#ifdef CONFIG_PM

/* This implementation assumes the devices remains powered on its VDDVARIO

 * pins during suspend. */



static int smsc911x_suspend(struct platform_device *pdev, pm_message_t state)

{

	struct net_device *dev = platform_get_drvdata(pdev);

	struct smsc911x_data *pdata = netdev_priv(dev);



	/* enable wake on LAN, energy detection and the external PME

	 * signal. */

	smsc911x_reg_write(pdata, PMT_CTRL,

		PMT_CTRL_PM_MODE_D1_ | PMT_CTRL_WOL_EN_ |

		PMT_CTRL_ED_EN_ | PMT_CTRL_PME_EN_);



	return 0;

}



static int smsc911x_resume(struct platform_device *pdev)

{

	struct net_device *dev = platform_get_drvdata(pdev);

	struct smsc911x_data *pdata = netdev_priv(dev);

	unsigned int to = 100;



	/* Note 3.11 from the datasheet:

	 * 	"When the LAN9220 is in a power saving state, a write of any

	 * 	 data to the BYTE_TEST register will wake-up the device."

	 */

	smsc911x_reg_write(pdata, BYTE_TEST, 0);



	/* poll the READY bit in PMT_CTRL. Any other access to the device is

	 * forbidden while this bit isn't set. Try for 100ms and return -EIO

	 * if it failed. */

	while (!(smsc911x_reg_read(pdata, PMT_CTRL) & PMT_CTRL_READY_) && --to)

		udelay(1000);



	return (to == 0) ? -EIO : 0;

}



#else

#define smsc911x_suspend	NULL

#define smsc911x_resume		NULL

#endif



static struct platform_driver smsc911x_driver = {

static struct platform_driver smsc911x_driver = {

	.probe = smsc911x_drv_probe,

	.probe = smsc911x_drv_probe,

	.remove = smsc911x_drv_remove,

	.remove = smsc911x_drv_remove,

	.driver = {

	.driver = {

		.name = SMSC_CHIPNAME,

		.name = SMSC_CHIPNAME,

	},

	},

	.suspend = smsc911x_suspend,

	.resume = smsc911x_resume,

};

};





/* Entry point for loading the module */

/* Entry point for loading the module */