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[PATCH] sd: read-only switch

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Support for the read-only switch on SD cards which must be enforced by the
host.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Pierre Ossman 2005-09-06 15:18:52 -07:00 committed by Linus Torvalds
parent 335eadf2ef
commit a00fc09029
4 changed files with 34 additions and 18 deletions
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39
drivers/mmc/mmc.c
View file

@ -413,8 +413,7 @@ static void mmc_decode_cid(struct mmc_card *card)
card->cid.month = UNSTUFF_BITS(resp, 8, 4);
card->cid.year += 2000; /* SD cards year offset */
}
else {
} else {
/*
* The selection of the format here is based upon published
* specs from sandisk and from what people have reported.
@ -494,8 +493,7 @@ static void mmc_decode_csd(struct mmc_card *card)
csd->capacity = (1 + m) << (e + 2);
csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
}
else {
} else {
/*
* We only understand CSD structure v1.1 and v1.2.
* v1.2 has extra information in bits 15, 11 and 10.
@ -738,10 +736,20 @@ static void mmc_discover_cards(struct mmc_host *host)
err = mmc_wait_for_cmd(host, &cmd, CMD_RETRIES);
if (err != MMC_ERR_NONE)
mmc_card_set_dead(card);
else
else {
card->rca = cmd.resp[0] >> 16;
}
else {
if (!host->ops->get_ro) {
printk(KERN_WARNING "%s: host does not "
"support reading read-only "
"switch. assuming write-enable.\n",
mmc_hostname(host));
} else {
if (host->ops->get_ro(host))
mmc_card_set_readonly(card);
}
}
} else {
cmd.opcode = MMC_SET_RELATIVE_ADDR;
cmd.arg = card->rca << 16;
cmd.flags = MMC_RSP_R1;
@ -833,24 +841,23 @@ static void mmc_setup(struct mmc_host *host)
int err;
u32 ocr;
host->mode = MMC_MODE_MMC;
host->mode = MMC_MODE_SD;
mmc_power_up(host);
mmc_idle_cards(host);
err = mmc_send_op_cond(host, 0, &ocr);
err = mmc_send_app_op_cond(host, 0, &ocr);
/*
* If we fail to detect any cards then try
* searching for SD cards.
* If we fail to detect any SD cards then try
* searching for MMC cards.
*/
if (err != MMC_ERR_NONE)
{
err = mmc_send_app_op_cond(host, 0, &ocr);
if (err != MMC_ERR_NONE) {
host->mode = MMC_MODE_MMC;
err = mmc_send_op_cond(host, 0, &ocr);
if (err != MMC_ERR_NONE)
return;
host->mode = MMC_MODE_SD;
}
host->ocr = mmc_select_voltage(host, ocr);

9
drivers/mmc/mmc_block.c
View file

@ -95,6 +95,10 @@ static int mmc_blk_open(struct inode *inode, struct file *filp)
if (md->usage == 2)
check_disk_change(inode->i_bdev);
ret = 0;
if ((filp->f_mode & FMODE_WRITE) &&
mmc_card_readonly(md->queue.card))
ret = -EROFS;
}
return ret;
@ -403,9 +407,10 @@ static int mmc_blk_probe(struct mmc_card *card)
if (err)
goto out;
printk(KERN_INFO "%s: %s %s %dKiB\n",
printk(KERN_INFO "%s: %s %s %dKiB %s\n",
md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
(card->csd.capacity << card->csd.read_blkbits) / 1024);
(card->csd.capacity << card->csd.read_blkbits) / 1024,
mmc_card_readonly(card)?"(ro)":"");
mmc_set_drvdata(card, md);
add_disk(md->disk);

3
include/linux/mmc/card.h
View file

@ -48,6 +48,7 @@ struct mmc_card {
#define MMC_STATE_DEAD (1<<1) /* device no longer in stack */
#define MMC_STATE_BAD (1<<2) /* unrecognised device */
#define MMC_STATE_SDCARD (1<<3) /* is an SD card */
#define MMC_STATE_READONLY (1<<4) /* card is read-only */
u32 raw_cid[4]; /* raw card CID */
u32 raw_csd[4]; /* raw card CSD */
struct mmc_cid cid; /* card identification */
@ -58,11 +59,13 @@ struct mmc_card {
#define mmc_card_dead(c) ((c)->state & MMC_STATE_DEAD)
#define mmc_card_bad(c) ((c)->state & MMC_STATE_BAD)
#define mmc_card_sd(c) ((c)->state & MMC_STATE_SDCARD)
#define mmc_card_readonly(c) ((c)->state & MMC_STATE_READONLY)
#define mmc_card_set_present(c) ((c)->state |= MMC_STATE_PRESENT)
#define mmc_card_set_dead(c) ((c)->state |= MMC_STATE_DEAD)
#define mmc_card_set_bad(c) ((c)->state |= MMC_STATE_BAD)
#define mmc_card_set_sd(c) ((c)->state |= MMC_STATE_SDCARD)
#define mmc_card_set_readonly(c) ((c)->state |= MMC_STATE_READONLY)
#define mmc_card_name(c) ((c)->cid.prod_name)
#define mmc_card_id(c) ((c)->dev.bus_id)

1
include/linux/mmc/host.h
View file

@ -62,6 +62,7 @@ struct mmc_ios {
struct mmc_host_ops {
void (*request)(struct mmc_host *host, struct mmc_request *req);
void (*set_ios)(struct mmc_host *host, struct mmc_ios *ios);
int (*get_ro)(struct mmc_host *host);
};
struct mmc_card;