linux-kernel - [PATCH] mmc: core: Add a capability for disabling mmc cards

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Message-Id: <1368517100-22243-1-git-send-email-adam.lee@canonical.com>
Date:	Tue, 14 May 2013 15:38:17 +0800
From:	Adam Lee <adam.lee@...onical.com>
To:	linux-kernel@...r.kernel.org
Cc:	nico@...xnic.net, Doug Anderson <dianders@...omium.org>,
	Alim Akhtar <alim.akhtar@...sung.com>
Subject: [PATCH] mmc: core: Add a capability for disabling mmc cards

On some systems we need a way to disable MMC card support in a MMC/SD
card slot due to the legal concern.

Add support in the core SD/MMC code to support this.

Signed-off-by: Doug Anderson <dianders@...omium.org>
Signed-off-by: Alim Akhtar <alim.akhtar@...sung.com>
Signed-off-by: Adam Lee <adam.lee@...onical.com>
---
 drivers/mmc/core/core.c  |    2 +-
 include/linux/mmc/host.h |    1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index c40396f..4788b88 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -2271,7 +2271,7 @@ static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq)
 		return 0;
 	if (!mmc_attach_sd(host))
 		return 0;
-	if (!mmc_attach_mmc(host))
+	if (!(host->caps2 & MMC_CAP2_NO_MMC) && !mmc_attach_mmc(host))
 		return 0;
 
 	mmc_power_off(host);
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index e326ae2..ffe5c3d 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -281,6 +281,7 @@ struct mmc_host {
 #define MMC_CAP2_PACKED_CMD	(MMC_CAP2_PACKED_RD | \
 				 MMC_CAP2_PACKED_WR)
 #define MMC_CAP2_NO_PRESCAN_POWERUP (1 << 14)	/* Don't power up before scan */
+#define MMC_CAP2_NO_MMC		(1 << 15)	/* Only SD supported, not MMC */
 
 	mmc_pm_flag_t		pm_caps;	/* supported pm features */
 
-- 
1.7.10.4

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