Hi Jerry, On 12/6/2011 5:15 PM, r66093@xxxxxxxxxxxxx wrote: > From: Jerry Huang <Chang-Ming.Huang@xxxxxxxxxxxxx> > > 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 <Chang-Ming.Huang@xxxxxxxxxxxxx> > CC: Chris Ball <cjb@xxxxxxxxxx> > --- > 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? > + > + return present; > +} > + > static void sdhci_enable_sdio_irq_nolock(struct sdhci_host *host, int enable) > { > if (host->flags & SDHCI_DEVICE_DEAD) > @@ -1884,6 +1904,7 @@ static const struct mmc_host_ops sdhci_ops = { > .request = sdhci_request, > .set_ios = sdhci_set_ios, > .get_ro = sdhci_get_ro, > + .get_cd = sdhci_get_cd, > .hw_reset = sdhci_hw_reset, > .enable_sdio_irq = sdhci_enable_sdio_irq, > .start_signal_voltage_switch = sdhci_start_signal_voltage_switch, > diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h > index 0a5b654..82f4d27 100644 > --- a/drivers/mmc/host/sdhci.h > +++ b/drivers/mmc/host/sdhci.h > @@ -69,6 +69,7 @@ > #define SDHCI_SPACE_AVAILABLE 0x00000400 > #define SDHCI_DATA_AVAILABLE 0x00000800 > #define SDHCI_CARD_PRESENT 0x00010000 > +#define SDHCI_CARD_CDPL 0x00040000 > #define SDHCI_WRITE_PROTECT 0x00080000 > #define SDHCI_DATA_LVL_MASK 0x00F00000 > #define SDHCI_DATA_LVL_SHIFT 20 > @@ -261,6 +262,7 @@ struct sdhci_ops { > > void (*set_clock)(struct sdhci_host *host, unsigned int clock); > > + int (*get_cd)(struct sdhci_host *host); > int (*enable_dma)(struct sdhci_host *host); > unsigned int (*get_max_clock)(struct sdhci_host *host); > unsigned int (*get_min_clock)(struct sdhci_host *host); -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html