From 736bb6bb01a2a180b6f062e792bd03658d57ab7e Mon Sep 17 00:00:00 2001 From: Adrian Hunter Date: Wed, 11 Feb 2009 14:52:20 +0200 Subject: [PATCH] mmc: Add Extended CSD register to debugfs Extended CSD is a MMC card register. As increasingly interesting fields are being added to Extended CSD, it is helpful to see its value. Note that SD cards do not have an Extended CSD register, so it is MMC only. Signed-off-by: Adrian Hunter Signed-off-by: Pierre Ossman --- drivers/mmc/core/debugfs.c | 67 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 67 insertions(+) diff --git a/drivers/mmc/core/debugfs.c b/drivers/mmc/core/debugfs.c index 1237bb4c722..610dbd1fcc8 100644 --- a/drivers/mmc/core/debugfs.c +++ b/drivers/mmc/core/debugfs.c @@ -184,6 +184,68 @@ static int mmc_dbg_card_status_get(void *data, u64 *val) DEFINE_SIMPLE_ATTRIBUTE(mmc_dbg_card_status_fops, mmc_dbg_card_status_get, NULL, "%08llx\n"); +#define EXT_CSD_STR_LEN 1025 + +static int mmc_ext_csd_open(struct inode *inode, struct file *filp) +{ + struct mmc_card *card = inode->i_private; + char *buf; + ssize_t n = 0; + u8 *ext_csd; + int err, i; + + buf = kmalloc(EXT_CSD_STR_LEN + 1, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + ext_csd = kmalloc(512, GFP_KERNEL); + if (!ext_csd) { + err = -ENOMEM; + goto out_free; + } + + mmc_claim_host(card->host); + err = mmc_send_ext_csd(card, ext_csd); + mmc_release_host(card->host); + if (err) + goto out_free; + + for (i = 511; i >= 0; i--) + n += sprintf(buf + n, "%02x", ext_csd[i]); + n += sprintf(buf + n, "\n"); + BUG_ON(n != EXT_CSD_STR_LEN); + + filp->private_data = buf; + kfree(ext_csd); + return 0; + +out_free: + kfree(buf); + kfree(ext_csd); + return err; +} + +static ssize_t mmc_ext_csd_read(struct file *filp, char __user *ubuf, + size_t cnt, loff_t *ppos) +{ + char *buf = filp->private_data; + + return simple_read_from_buffer(ubuf, cnt, ppos, + buf, EXT_CSD_STR_LEN); +} + +static int mmc_ext_csd_release(struct inode *inode, struct file *file) +{ + kfree(file->private_data); + return 0; +} + +static struct file_operations mmc_dbg_ext_csd_fops = { + .open = mmc_ext_csd_open, + .read = mmc_ext_csd_read, + .release = mmc_ext_csd_release, +}; + void mmc_add_card_debugfs(struct mmc_card *card) { struct mmc_host *host = card->host; @@ -211,6 +273,11 @@ void mmc_add_card_debugfs(struct mmc_card *card) &mmc_dbg_card_status_fops)) goto err; + if (mmc_card_mmc(card)) + if (!debugfs_create_file("ext_csd", S_IRUSR, root, card, + &mmc_dbg_ext_csd_fops)) + goto err; + return; err: -- 2.41.1