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 <[email protected]>
> ---
>
> 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 ?
> +
> + 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 ?
> +
> + 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
>
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