From 5275a652d296711aaf7f2f4173c8db153e5777c3 Mon Sep 17 00:00:00 2001 From: Uri Yanai Date: Sun, 14 Aug 2016 11:46:36 +0300 Subject: mmc: sd: Export SD Status via “ssr” device attribute MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The SD Status register contains several important fields related to the SD Card proprietary features. Those fields may be used by user space applications for vendor specific usage. None of those fields are exported today by the driver to user space. In this patch, we are reading the SD Status register and exporting (using MMC_DEV_ATTR) the SD Status register to the user space. Signed-off-by: Uri Yanai Signed-off-by: Ulf Hansson --- drivers/mmc/core/sd.c | 37 +++++++++++++++++++------------------ 1 file changed, 19 insertions(+), 18 deletions(-) (limited to 'drivers') diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c index 0123936241b0..73c762a28dfe 100644 --- a/drivers/mmc/core/sd.c +++ b/drivers/mmc/core/sd.c @@ -223,8 +223,7 @@ static int mmc_decode_scr(struct mmc_card *card) static int mmc_read_ssr(struct mmc_card *card) { unsigned int au, es, et, eo; - int err, i; - u32 *ssr; + int i; if (!(card->csd.cmdclass & CCC_APP_SPEC)) { pr_warn("%s: card lacks mandatory SD Status function\n", @@ -232,33 +231,27 @@ static int mmc_read_ssr(struct mmc_card *card) return 0; } - ssr = kmalloc(64, GFP_KERNEL); - if (!ssr) - return -ENOMEM; - - err = mmc_app_sd_status(card, ssr); - if (err) { + if (mmc_app_sd_status(card, card->raw_ssr)) { pr_warn("%s: problem reading SD Status register\n", mmc_hostname(card->host)); - err = 0; - goto out; + return 0; } for (i = 0; i < 16; i++) - ssr[i] = be32_to_cpu(ssr[i]); + card->raw_ssr[i] = be32_to_cpu(card->raw_ssr[i]); /* * UNSTUFF_BITS only works with four u32s so we have to offset the * bitfield positions accordingly. */ - au = UNSTUFF_BITS(ssr, 428 - 384, 4); + au = UNSTUFF_BITS(card->raw_ssr, 428 - 384, 4); if (au) { if (au <= 9 || card->scr.sda_spec3) { card->ssr.au = sd_au_size[au]; - es = UNSTUFF_BITS(ssr, 408 - 384, 16); - et = UNSTUFF_BITS(ssr, 402 - 384, 6); + es = UNSTUFF_BITS(card->raw_ssr, 408 - 384, 16); + et = UNSTUFF_BITS(card->raw_ssr, 402 - 384, 6); if (es && et) { - eo = UNSTUFF_BITS(ssr, 400 - 384, 2); + eo = UNSTUFF_BITS(card->raw_ssr, 400 - 384, 2); card->ssr.erase_timeout = (et * 1000) / es; card->ssr.erase_offset = eo * 1000; } @@ -267,9 +260,8 @@ static int mmc_read_ssr(struct mmc_card *card) mmc_hostname(card->host)); } } -out: - kfree(ssr); - return err; + + return 0; } /* @@ -666,6 +658,14 @@ MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1], MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1], card->raw_csd[2], card->raw_csd[3]); MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]); +MMC_DEV_ATTR(ssr, + "%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x\n", + card->raw_ssr[0], card->raw_ssr[1], card->raw_ssr[2], + card->raw_ssr[3], card->raw_ssr[4], card->raw_ssr[5], + card->raw_ssr[6], card->raw_ssr[7], card->raw_ssr[8], + card->raw_ssr[9], card->raw_ssr[10], card->raw_ssr[11], + card->raw_ssr[12], card->raw_ssr[13], card->raw_ssr[14], + card->raw_ssr[15]); MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year); MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9); MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9); @@ -698,6 +698,7 @@ static struct attribute *sd_std_attrs[] = { &dev_attr_cid.attr, &dev_attr_csd.attr, &dev_attr_scr.attr, + &dev_attr_ssr.attr, &dev_attr_date.attr, &dev_attr_erase_size.attr, &dev_attr_preferred_erase_size.attr, -- cgit v1.2.3