sdhci: add regulator support
This patch adds support for regulator API to sdhci core driver.
Regulators can be used to disable power in suspended state to reduce
dissipated energy.
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.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>
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 70001ec..c86c14af 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -19,6 +19,7 @@
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <linux/scatterlist.h>
+#include <linux/regulator/consumer.h>
#include <linux/leds.h>
@@ -1608,7 +1609,10 @@
free_irq(host->irq, host);
- return 0;
+ if (host->vmmc)
+ ret = regulator_disable(host->vmmc);
+
+ return ret;
}
EXPORT_SYMBOL_GPL(sdhci_suspend_host);
@@ -1617,6 +1621,13 @@
{
int ret;
+ if (host->vmmc) {
+ int ret = regulator_enable(host->vmmc);
+ if (ret)
+ return ret;
+ }
+
+
if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
if (host->ops->enable_dma)
host->ops->enable_dma(host);
@@ -1889,6 +1900,14 @@
if (ret)
goto untasklet;
+ host->vmmc = regulator_get(mmc_dev(mmc), "vmmc");
+ if (IS_ERR(host->vmmc)) {
+ printk(KERN_INFO "%s: no vmmc regulator found\n", mmc_hostname(mmc));
+ host->vmmc = NULL;
+ } else {
+ regulator_enable(host->vmmc);
+ }
+
sdhci_init(host, 0);
#ifdef CONFIG_MMC_DEBUG
@@ -1973,6 +1992,11 @@
tasklet_kill(&host->card_tasklet);
tasklet_kill(&host->finish_tasklet);
+ if (host->vmmc) {
+ regulator_disable(host->vmmc);
+ regulator_put(host->vmmc);
+ }
+
kfree(host->adma_desc);
kfree(host->align_buffer);