On Fri, 22 Apr 2011 14:43:11 +0200 Antonio Ospite <osp...@studenti.unina.it> wrote:
> Add support for powering up SD cards driven by regulators.
> This makes the mmc_spi driver work also with the Motorola A910 phone.
>
> Signed-off-by: Antonio Ospite <osp...@studenti.unina.it>
> ---
>
> Changes since v1:
> - Remove the ifdef CONFIG_REGULATOR as regulator_get() degenerates to
> a stub as well when the regulator framework is disabled.
> - Release the regulator in mmc_spi_remove()
>
Ping.
> Thanks,
> Antonio
>
> drivers/mmc/host/mmc_spi.c | 63 +++++++++++++++++++++++++++++++++++--------
> 1 files changed, 51 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/mmc/host/mmc_spi.c b/drivers/mmc/host/mmc_spi.c
> index 0f3672d..62b3b02 100644
> --- a/drivers/mmc/host/mmc_spi.c
> +++ b/drivers/mmc/host/mmc_spi.c
> @@ -31,6 +31,7 @@
> #include <linux/dma-mapping.h>
> #include <linux/crc7.h>
> #include <linux/crc-itu-t.h>
> +#include <linux/regulator/consumer.h>
> #include <linux/scatterlist.h>
>
> #include <linux/mmc/host.h>
> @@ -150,11 +151,13 @@ struct mmc_spi_host {
> */
> void *ones;
> dma_addr_t ones_dma;
> +
> + struct regulator *vcc;
> };
>
> static inline int mmc_spi_canpower(struct mmc_spi_host *host)
> {
> - return host->pdata && host->pdata->setpower;
> + return (host->pdata && host->pdata->setpower) || host->vcc;
> }
>
>
> /****************************************************************************/
> @@ -1225,17 +1228,35 @@ static inline int mmc_spi_setpower(struct
> mmc_spi_host *host,
> unsigned char power_mode,
> unsigned int vdd)
> {
> + if (!mmc_spi_canpower(host))
> + return -ENOSYS;
> +
> /* switch power on/off if possible, accounting for
> * max 250msec powerup time if needed.
> */
> - if (mmc_spi_canpower(host)) {
> - switch (power_mode) {
> - case MMC_POWER_OFF:
> - case MMC_POWER_UP:
> + switch (power_mode) {
> + case MMC_POWER_OFF:
> + if (host->vcc) {
> + int ret = mmc_regulator_set_ocr(host->mmc,
> + host->vcc, 0);
> + if (ret)
> + return ret;
> + } else {
> + host->pdata->setpower(&host->spi->dev, vdd);
> + }
> + break;
> +
> + case MMC_POWER_UP:
> + if (host->vcc) {
> + int ret = mmc_regulator_set_ocr(host->mmc,
> + host->vcc, vdd);
> + if (ret)
> + return ret;
> + } else {
> host->pdata->setpower(&host->spi->dev, vdd);
> - if (power_mode == MMC_POWER_UP)
> - msleep(host->powerup_msecs);
> }
> + msleep(host->powerup_msecs);
> + break;
> }
>
> return 0;
> @@ -1420,12 +1441,27 @@ static int mmc_spi_probe(struct spi_device *spi)
> * and power switching gpios.
> */
> host->pdata = mmc_spi_get_pdata(spi);
> - if (host->pdata)
> - mmc->ocr_avail = host->pdata->ocr_mask;
> - if (!mmc->ocr_avail) {
> - dev_warn(&spi->dev, "ASSUMING 3.2-3.4 V slot power\n");
> - mmc->ocr_avail = MMC_VDD_32_33|MMC_VDD_33_34;
> +
> + host->vcc = regulator_get(mmc_dev(host->mmc), "vmmc");
> + if (IS_ERR(host->vcc)) {
> + host->vcc = NULL;
> + } else {
> + host->mmc->ocr_avail = mmc_regulator_get_ocrmask(host->vcc);
> + if (host->pdata && host->pdata->ocr_mask)
> + dev_warn(mmc_dev(host->mmc),
> + "ocr_mask/setpower will not be used\n");
> }
> +
> + if (host->vcc == NULL) {
> + /* fall-back to platform data */
> + if (host->pdata)
> + mmc->ocr_avail = host->pdata->ocr_mask;
> + if (!mmc->ocr_avail) {
> + dev_warn(&spi->dev, "ASSUMING 3.2-3.4 V slot power\n");
> + mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
> + }
> + }
> +
> if (mmc_spi_canpower(host)) {
> host->powerup_msecs = host->pdata->powerup_msecs;
> if (!host->powerup_msecs || host->powerup_msecs > 250)
> @@ -1523,6 +1559,9 @@ static int __devexit mmc_spi_remove(struct spi_device
> *spi)
> if (host->pdata && host->pdata->exit)
> host->pdata->exit(&spi->dev, mmc);
>
> + if (host->vcc)
> + regulator_put(host->vcc);
> +
> mmc_remove_host(mmc);
>
> if (host->dma_dev) {
> --
> 1.7.4.4
>
>
--
Antonio Ospite
http://ao2.it
PGP public key ID: 0x4553B001
A: Because it messes up the order in which people normally read text.
See http://en.wikipedia.org/wiki/Posting_style
Q: Why is top-posting such a bad thing?
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