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authorNicolas Pitre <nico@fluxnic.net>2010-03-06 00:43:31 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2010-03-06 22:26:36 +0300
commitda68c4eb258cd9f3f0b8aeb7e46b8118bb6358b6 (patch)
treeb7767ce0b0d05d16dec6eeeadd21bd70cc458ac7 /include/linux/mmc/sdio_func.h
parent9e506f35b1dc327c448d4791bc098f07b9b2efe9 (diff)
downloadlinux-da68c4eb258cd9f3f0b8aeb7e46b8118bb6358b6.tar.xz
sdio: introduce API for special power management features
This patch series provides the core changes needed to allow SDIO cards to remain powered and active while the host system is suspended, and let them wake up the host system when needed. This is used to implement wake-on-lan with SDIO wireless cards at the moment. Patches to add that support to the libertas driver will be posted separately. This patch: Some SDIO cards have the ability to keep on running autonomously when the host system is suspended, and wake it up when needed. This however requires that the host controller preserve power to the card, and configure itself appropriately for wake-up. There is however 4 layers of abstractions involved: the host controller driver, the MMC core code, the SDIO card management code, and the actual SDIO function driver. To make things simple and manageable, host drivers must advertise their PM capabilities with a feature bitmask, then function drivers can query and set those features from their suspend method. Then each layer in the suspend call chain is expected to act upon those bits accordingly. [akpm@linux-foundation.org: fix typo in comment] Signed-off-by: Nicolas Pitre <nico@marvell.com> Cc: <linux-mmc@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/mmc/sdio_func.h')
-rw-r--r--include/linux/mmc/sdio_func.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/mmc/sdio_func.h b/include/linux/mmc/sdio_func.h
index ac3ab683fec6..c6c0cceba5fe 100644
--- a/include/linux/mmc/sdio_func.h
+++ b/include/linux/mmc/sdio_func.h
@@ -15,6 +15,8 @@
#include <linux/device.h>
#include <linux/mod_devicetable.h>
+#include <linux/mmc/pm.h>
+
struct mmc_card;
struct sdio_func;
@@ -153,5 +155,8 @@ extern unsigned char sdio_f0_readb(struct sdio_func *func,
extern void sdio_f0_writeb(struct sdio_func *func, unsigned char b,
unsigned int addr, int *err_ret);
+extern mmc_pm_flag_t sdio_get_host_pm_caps(struct sdio_func *func);
+extern int sdio_set_host_pm_flags(struct sdio_func *func, mmc_pm_flag_t flags);
+
#endif