> -----Original Message----- > From: Hein_Tibosch [mailto:[email protected]] > Sent: Tuesday, December 06, 2011 8:11 PM > To: Huang Changming-R66093 > Cc: [email protected]; Huang Changming-R66093; Chris Ball > Subject: Re: [PATCH 4/5 v2] SDHCI: add sdhci_get_cd callback to detect > the card > > Hi Jerry, > > On 12/6/2011 5:15 PM, [email protected] wrote: > > From: Jerry Huang <[email protected]> > > > > Add callback function sdhci_get_cd to detect the card. > > And one new callback added to implement the card detect in sdhci > struncture. > > If special platform has the card detect callback, it will return the > > card state, the value zero is for absent cardi and one is for present > card. > > If the controller don't support card detect, sdhci_get_cd will return - > ENOSYS. > > > > Signed-off-by: Jerry Huang <[email protected]> > > CC: Chris Ball <[email protected]> > > --- > > changes for v2: > > - when controller don't support get_cd, return -ENOSYS > > - add new callback for sdhci to detect the card > > - add the CC > > > > drivers/mmc/host/sdhci.c | 21 +++++++++++++++++++++ > > drivers/mmc/host/sdhci.h | 2 ++ > > 2 files changed, 23 insertions(+), 0 deletions(-) > > > > diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index > > 6d8eea3..2196c5e 100644 > > --- a/drivers/mmc/host/sdhci.c > > +++ b/drivers/mmc/host/sdhci.c > > @@ -2,6 +2,7 @@ > > * linux/drivers/mmc/host/sdhci.c - Secure Digital Host Controller > Interface driver > > * > > * Copyright (C) 2005-2008 Pierre Ossman, All Rights Reserved. > > + * Copyright (C) 2011 Freescale Semiconductor Inc. > > * > > * This program is free software; you can redistribute it and/or > modify > > * it under the terms of the GNU General Public License as published > > by @@ -1518,6 +1519,25 @@ static int sdhci_get_ro(struct mmc_host *mmc) > > return ret; > > } > > > > +/* Return values for the sdjco_get_cd callback: > > + * 0 for a absent card > > + * 1 for a present card > > + * -ENOSYS when not supported (equal to NULL callback) > > + */ > > +static int sdhci_get_cd(struct mmc_host *mmc) { > > + struct sdhci_host *host = mmc_priv(mmc); > > + unsigned long flags; > > + int present = -ENOSYS; > > + > > + spin_lock_irqsave(&host->lock, flags); > > + if (host->ops->get_cd) > > + present = host->ops->get_cd(host); > > + spin_unlock_irqrestore(&host->lock, flags); > > Maybe only use spin-lock if get_cd is defined? > Yes, I will move it.
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