Add a function to get a regulator, supplying card's Vdd on a specific host.
If such a regulator is found, the function checks, whether a valid OCR mask
can be obtained from this regulator, and whether it can switch card's power
on and off.
Signed-off-by: Guennadi Liakhovetski <g.liakhovet...@gmx.de>
Cc: Mark Brown <broo...@opensource.wolfsonmicro.com>
---
drivers/mmc/core/core.c | 27 +++++++++++++++++++++++++++
include/linux/mmc/host.h | 6 ++++++
2 files changed, 33 insertions(+), 0 deletions(-)
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 7474c47..ccb5c8a 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -1012,6 +1012,33 @@ int mmc_regulator_set_ocr(struct mmc_host *mmc,
}
EXPORT_SYMBOL(mmc_regulator_set_ocr);
+struct regulator *mmc_regulator_get_vmmc(struct mmc_host *mmc)
+{
+ struct device *dev = mmc_dev(mmc);
+ struct regulator *supply = devm_regulator_get(dev, "vmmc");
+ int ret;
+
+ if (IS_ERR(supply))
+ return NULL;
+
+ ret = mmc_regulator_get_ocrmask(supply);
+ if (ret > 0)
+ mmc->ocr_avail = ret;
+
+ if (regulator_can_change_status(supply)) {
+ mmc->caps |= MMC_CAP_POWER_OFF_CARD;
+ return supply;
+ }
+
+ devm_regulator_put(supply);
+
+ if (ret <= 0)
+ dev_warn(dev, "Ignoring useless (dummy?) regulator\n");
+
+ return NULL;
+}
+EXPORT_SYMBOL(mmc_regulator_get_vmmc);
+
#endif /* CONFIG_REGULATOR */
/*
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index cbde4b7..bcf5562 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -362,6 +362,7 @@ int mmc_regulator_get_ocrmask(struct regulator *supply);
int mmc_regulator_set_ocr(struct mmc_host *mmc,
struct regulator *supply,
unsigned short vdd_bit);
+struct regulator *mmc_regulator_get_vmmc(struct mmc_host *mmc);
#else
static inline int mmc_regulator_get_ocrmask(struct regulator *supply)
{
@@ -374,6 +375,11 @@ static inline int mmc_regulator_set_ocr(struct mmc_host
*mmc,
{
return 0;
}
+
+static inline struct regulator *mmc_regulator_get_vmmc(struct mmc_host *mmc)
+{
+ return NULL;
+}
#endif
int mmc_card_awake(struct mmc_host *host);
--
1.7.2.5
--
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