From: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
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@xxxxxxxxxxx>
Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
Acked-by: Mark Brown <broonie@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
Cc: <linux-mmc@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/mmc/host/sdhci.c | 26 +++++++++++++++++++++++++-
drivers/mmc/host/sdhci.h | 2 ++
2 files changed, 27 insertions(+), 1 deletion(-)
diff -puN drivers/mmc/host/sdhci.c~sdhci-add-regulator-support drivers/mmc/host/sdhci.c
--- a/drivers/mmc/host/sdhci.c~sdhci-add-regulator-support
+++ a/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 @@ int sdhci_suspend_host(struct sdhci_host
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 sdhci_resume_host(struct sdhci_host
{
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 @@ int sdhci_add_host(struct sdhci_host *ho
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 @@ void sdhci_remove_host(struct sdhci_host
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);
diff -puN drivers/mmc/host/sdhci.h~sdhci-add-regulator-support drivers/mmc/host/sdhci.h
--- a/drivers/mmc/host/sdhci.h~sdhci-add-regulator-support
+++ a/drivers/mmc/host/sdhci.h
@@ -249,6 +249,8 @@ struct sdhci_host {
const struct sdhci_ops *ops; /* Low level hw interface */
+ struct regulator *vmmc; /* Power regulator */
+
/* Internal data */
struct mmc_host *mmc; /* MMC structure */
u64 dma_mask; /* custom DMA mask */
_
--
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