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ARM: 6307/1: mmci: allow the card detect GPIO value not to be inverted

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On some platforms, the GPIO value from the gpio_cd pin doesn't need to
be inverted to get it active high.  Add a cd_invert platform data
parameter and change existing platforms using GPIO for CD (only
Realview) to enable it.

Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Rabin Vincent 2010-08-09 12:54:43 +01:00 committed by Russell King
parent d4348c6789
commit 2971944582
3 changed files with 7 additions and 2 deletions
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2
arch/arm/mach-realview/core.c
View File

@ -259,6 +259,7 @@ struct mmci_platform_data realview_mmc0_plat_data = {
.status = realview_mmc_status,
.gpio_wp = 17,
.gpio_cd = 16,
.cd_invert = true,
};
struct mmci_platform_data realview_mmc1_plat_data = {
@ -266,6 +267,7 @@ struct mmci_platform_data realview_mmc1_plat_data = {
.status = realview_mmc_status,
.gpio_wp = 19,
.gpio_cd = 18,
.cd_invert = true,
};
/*

5
drivers/mmc/host/mmci.c
View File

@ -570,12 +570,13 @@ static int mmci_get_ro(struct mmc_host *mmc)
static int mmci_get_cd(struct mmc_host *mmc)
{
struct mmci_host *host = mmc_priv(mmc);
struct mmci_platform_data *plat = host->plat;
unsigned int status;
if (host->gpio_cd == -ENOSYS)
status = host->plat->status(mmc_dev(host->mmc));
status = plat->status(mmc_dev(host->mmc));
else
status = !gpio_get_value(host->gpio_cd);
status = !!gpio_get_value(host->gpio_cd) ^ plat->cd_invert;
/*
* Use positive logic throughout - status is zero for no card,

2
include/linux/amba/mmci.h
View File

@ -24,6 +24,7 @@
* whether a card is present in the MMC slot or not
* @gpio_wp: read this GPIO pin to see if the card is write protected
* @gpio_cd: read this GPIO pin to detect card insertion
* @cd_invert: true if the gpio_cd pin value is active low
* @capabilities: the capabilities of the block as implemented in
* this platform, signify anything MMC_CAP_* from mmc/host.h
*/
@ -35,6 +36,7 @@ struct mmci_platform_data {
unsigned int (*status)(struct device *);
int gpio_wp;
int gpio_cd;
bool cd_invert;
unsigned long capabilities;
};