From: <r66093@freescale.com>
To: linux-mmc@vger.kernel.org
Cc: Jerry Huang <r66093@freescale.com>
Subject: [PATCH 1/3] SDHCI: add sdhci_get_cd callback to detect the card
Date: Fri, 20 May 2011 15:35:12 +0800 [thread overview]
Message-ID: <1305876914-23714-1-git-send-email-r66093@freescale.com> (raw)
From: Jerry Huang <r66093@freescale.com>
Add callback function sdhci_get_cd to detect the card.
In order to check if the card is present,
we will read the PRESENT STATE register and check the bit15.
Signed-off-by: Jerry Huang <r66093@freescale.com>
---
drivers/mmc/host/sdhci.c | 19 +++++++++++++++++++
1 files changed, 19 insertions(+), 0 deletions(-)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 9e15f41..2e60372 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1262,6 +1262,24 @@ static int sdhci_get_ro(struct mmc_host *mmc)
!is_readonly : is_readonly;
}
+static int sdhci_get_cd(struct mmc_host *mmc)
+{
+ struct sdhci_host *host = mmc_priv(mmc);
+ unsigned long flags;
+ int present;
+
+ spin_lock_irqsave(&host->lock, flags);
+
+ if (host->flags & SDHCI_DEVICE_DEAD)
+ present = 0;
+ else
+ present = sdhci_readl(host, SDHCI_PRESENT_STATE);
+
+ spin_unlock_irqrestore(&host->lock, flags);
+
+ return present & SDHCI_CARD_PRESENT;
+}
+
static void sdhci_enable_sdio_irq(struct mmc_host *mmc, int enable)
{
struct sdhci_host *host;
@@ -1288,6 +1306,7 @@ 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,
.enable_sdio_irq = sdhci_enable_sdio_irq,
};
--
1.7.4.1
next reply other threads:[~2011-05-20 8:23 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-20 7:35 r66093 [this message]
2011-05-20 7:35 ` [PATCH 2/3] MMC/SD: add callback function to detect card r66093
2011-05-20 7:35 ` [PATCH 3/3] SDHC/MMC: add f_min to mmc_power_on r66093
-- strict thread matches above, loose matches on Subject: below --
2011-05-12 5:24 [PATCH 1/3] SDHCI: add sdhci_get_cd callback to detect the card r66093
2011-05-11 9:32 Chang-Ming.Huang
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