On Tue, 12 Jun 2012, Philip Rakity wrote:
>
> On Jun 12, 2012, at 8:57 AM, Guennadi Liakhovetski wrote:
>
> > Add a function to get regulators, supplying card's Vdd and Vccq on a
> > specific host. If a Vdd supplying regulator is found, the function checks,
> > whether a valid OCR mask can be obtained from it. The Vccq regulator is
> > optional. A failure to get it is not fatal.
> >
> > Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@xxxxxx>
> > ---
> >
> > v4:
> >
> > 1. add _GPL to EXPORT_SYMBOL (note: a recently posted patch changes
> > another occurrence of EXPORT_SYMBOL too, so, this patch will apply with a
> > fuzz, if merged after)
> >
> > 2. add an optional vqmmc regulator, which also changes the function
> > prototype
> >
> > 3. print a warning, if failed to get an OCR mask
> >
> > Thanks to all, who commented
> >
> > drivers/mmc/core/core.c | 27 +++++++++++++++++++++++++++
> > include/linux/mmc/host.h | 12 ++++++++++++
> > 2 files changed, 39 insertions(+), 0 deletions(-)
> >
> > diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
> > index 0b6141d..d77a238 100644
> > --- a/drivers/mmc/core/core.c
> > +++ b/drivers/mmc/core/core.c
> > @@ -1013,6 +1013,33 @@ int mmc_regulator_set_ocr(struct mmc_host *mmc,
> > }
> > EXPORT_SYMBOL(mmc_regulator_set_ocr);
> >
> > +int mmc_regulator_get_supply(struct mmc_host *mmc, struct mmc_supply *s)
> > +{
> > + struct device *dev = mmc_dev(mmc);
> > + struct regulator *supply;
> > + int ret;
> > +
> > + if (!mmc || !s)
> > + return -EINVAL;
> > +
> > + supply = devm_regulator_get(dev, "vmmc");
> > +
> > + if (IS_ERR(supply))
> > + return PTR_ERR(supply);
> > +
> > + s->vmmc = supply;
> > + s->vqmmc = devm_regulator_get(dev, "vqmmc");
>
> Should we set vqmmc to NULL if an error was returned ?
Don't think so, drivers can perfectly check for IS_ERR() themselves.
> > +
> > + ret = mmc_regulator_get_ocrmask(supply);
> > + if (ret > 0)
> > + mmc->ocr_avail = ret;
> > + else
> > + dev_warn(mmc_dev(mmc), "Failed getting OCR mask: %d\n", ret);
>
> I was wondering if sdhci (or the other SD Host drivers can work if no ocr_avail mask is set ?
Yes, e.g., if it's a dummy regulator and the board actually doesn't need
one.
> > +
> > + return 0;
> > +}
> > +EXPORT_SYMBOL_GPL(mmc_regulator_get_supply);
> > +
> > #endif /* CONFIG_REGULATOR */
> >
> > /*
> > diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
> > index 0707d22..3192335 100644
> > --- a/include/linux/mmc/host.h
> > +++ b/include/linux/mmc/host.h
> > @@ -359,11 +359,17 @@ static inline void mmc_signal_sdio_irq(struct mmc_host *host)
> >
> > struct regulator;
> >
> > +struct mmc_supply {
> > + struct regulator *vmmc; /* Card power supply */
> > + struct regulator *vqmmc; /* Optional Vccq supply */
> > +};
> > +
> > #ifdef CONFIG_REGULATOR
> > int mmc_regulator_get_ocrmask(struct regulator *supply);
> > int mmc_regulator_set_ocr(struct mmc_host *mmc,
> > struct regulator *supply,
> > unsigned short vdd_bit);
> > +int mmc_regulator_get_supply(struct mmc_host *mmc, struct mmc_supply *s);
> > #else
> > static inline int mmc_regulator_get_ocrmask(struct regulator *supply)
> > {
> > @@ -376,6 +382,12 @@ static inline int mmc_regulator_set_ocr(struct mmc_host *mmc,
> > {
> > return 0;
> > }
> > +
> > +static inline int mmc_regulator_get_supply(struct mmc_host *mmc,
> > + struct mmc_supply *s)
> > +{
> > + return 0;
> > +}
> > #endif
> >
> > int mmc_card_awake(struct mmc_host *host);
> > --
> > 1.7.2.5
Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
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