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sdhci: add regulator support

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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>
This commit is contained in:
Marek Szyprowski 2010-08-10 18:01:59 -07:00 committed by Linus Torvalds
parent 17866e14f3
commit 9bea3c850d
2 changed files with 27 additions and 1 deletions
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26
drivers/mmc/host/sdhci.c
View file

@ -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 *host, pm_message_t state)
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 *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 *host)
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 *host, int dead)
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);

2
drivers/mmc/host/sdhci.h
View file

@ -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 */