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authorAnton Vorontsov <avorontsov@ru.mvista.com>2008-06-17 16:17:39 +0200
committerPierre Ossman <drzeus@drzeus.cx>2008-07-15 14:14:41 +0200
commit08f80bb5196517a0dfe50dc7c10f234c0ff2f0e8 (patch)
treeaee5e1808521eb3c00ff37d50a2e8957bebbd34b /drivers/mmc
parentmmc_spi: add support for card-detection polling (diff)
downloadlinux-08f80bb5196517a0dfe50dc7c10f234c0ff2f0e8.tar.xz
linux-08f80bb5196517a0dfe50dc7c10f234c0ff2f0e8.zip
mmc: change .get_ro() callback semantics
Now get_ro() callback must return 0/1 values for its logical states, and negative errno values in case of error. If particular host instance doesn't support RO/WP switch, it should return -ENOSYS. This patch changes some hosts in two ways: 1. Now functions should be smart to not return negative values in "RO asserted" case (particularly gpio_ calls could return negative values for the outermost GPIOs). Also, board code usually passes get_ro() callbacks that directly return gpioreg & bit result, so at91_mci, imxmmc, pxamci and mmc_spi's get_ro() handlers need take special care when returning platform's values to the mmc core. 2. In case of host instance didn't implement get_ro() callback, it should really return -ENOSYS and let the mmc core decide what to do about it (mmc core thinks the same way as the hosts, so it isn't functional change). Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com> Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/core/sd.c4
-rw-r--r--drivers/mmc/host/at91_mci.c18
-rw-r--r--drivers/mmc/host/imxmmc.c9
-rw-r--r--drivers/mmc/host/mmc_spi.c9
-rw-r--r--drivers/mmc/host/pxamci.c9
-rw-r--r--drivers/mmc/host/wbsd.c2
6 files changed, 28 insertions, 23 deletions
diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index 7ef3b15c5e3d..b122eb9ea453 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -494,13 +494,13 @@ static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
* Check if read-only switch is active.
*/
if (!oldcard) {
- if (!host->ops->get_ro) {
+ if (!host->ops->get_ro || host->ops->get_ro(host) < 0) {
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))
+ if (host->ops->get_ro(host) > 0)
mmc_card_set_readonly(card);
}
}
diff --git a/drivers/mmc/host/at91_mci.c b/drivers/mmc/host/at91_mci.c
index 8979ad330a4d..b9d4ed6b29b1 100644
--- a/drivers/mmc/host/at91_mci.c
+++ b/drivers/mmc/host/at91_mci.c
@@ -793,19 +793,15 @@ static irqreturn_t at91_mmc_det_irq(int irq, void *_host)
static int at91_mci_get_ro(struct mmc_host *mmc)
{
- int read_only = 0;
struct at91mci_host *host = mmc_priv(mmc);
- if (host->board->wp_pin) {
- read_only = gpio_get_value(host->board->wp_pin);
- printk(KERN_WARNING "%s: card is %s\n", mmc_hostname(mmc),
- (read_only ? "read-only" : "read-write") );
- }
- else {
- printk(KERN_WARNING "%s: host does not support reading read-only "
- "switch. Assuming write-enable.\n", mmc_hostname(mmc));
- }
- return read_only;
+ if (host->board->wp_pin)
+ return !!gpio_get_value(host->board->wp_pin);
+ /*
+ * Board doesn't support read only detection; let the mmc core
+ * decide what to do.
+ */
+ return -ENOSYS;
}
static const struct mmc_host_ops at91_mci_ops = {
diff --git a/drivers/mmc/host/imxmmc.c b/drivers/mmc/host/imxmmc.c
index eed211b2ac70..5e880c0f1349 100644
--- a/drivers/mmc/host/imxmmc.c
+++ b/drivers/mmc/host/imxmmc.c
@@ -892,9 +892,12 @@ static int imxmci_get_ro(struct mmc_host *mmc)
struct imxmci_host *host = mmc_priv(mmc);
if (host->pdata && host->pdata->get_ro)
- return host->pdata->get_ro(mmc_dev(mmc));
- /* Host doesn't support read only detection so assume writeable */
- return 0;
+ return !!host->pdata->get_ro(mmc_dev(mmc));
+ /*
+ * Board doesn't support read only detection; let the mmc core
+ * decide what to do.
+ */
+ return -ENOSYS;
}
diff --git a/drivers/mmc/host/mmc_spi.c b/drivers/mmc/host/mmc_spi.c
index 547eb857b1b3..4e82f64a96bc 100644
--- a/drivers/mmc/host/mmc_spi.c
+++ b/drivers/mmc/host/mmc_spi.c
@@ -1126,9 +1126,12 @@ static int mmc_spi_get_ro(struct mmc_host *mmc)
struct mmc_spi_host *host = mmc_priv(mmc);
if (host->pdata && host->pdata->get_ro)
- return host->pdata->get_ro(mmc->parent);
- /* board doesn't support read only detection; assume writeable */
- return 0;
+ return !!host->pdata->get_ro(mmc->parent);
+ /*
+ * Board doesn't support read only detection; let the mmc core
+ * decide what to do.
+ */
+ return -ENOSYS;
}
static int mmc_spi_get_cd(struct mmc_host *mmc)
diff --git a/drivers/mmc/host/pxamci.c b/drivers/mmc/host/pxamci.c
index d89475d36988..d39f59738866 100644
--- a/drivers/mmc/host/pxamci.c
+++ b/drivers/mmc/host/pxamci.c
@@ -374,9 +374,12 @@ static int pxamci_get_ro(struct mmc_host *mmc)
struct pxamci_host *host = mmc_priv(mmc);
if (host->pdata && host->pdata->get_ro)
- return host->pdata->get_ro(mmc_dev(mmc));
- /* Host doesn't support read only detection so assume writeable */
- return 0;
+ return !!host->pdata->get_ro(mmc_dev(mmc));
+ /*
+ * Board doesn't support read only detection; let the mmc core
+ * decide what to do.
+ */
+ return -ENOSYS;
}
static void pxamci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
diff --git a/drivers/mmc/host/wbsd.c b/drivers/mmc/host/wbsd.c
index c303e7f57ab4..67e5a9b80f53 100644
--- a/drivers/mmc/host/wbsd.c
+++ b/drivers/mmc/host/wbsd.c
@@ -939,7 +939,7 @@ static int wbsd_get_ro(struct mmc_host *mmc)
spin_unlock_bh(&host->lock);
- return csr & WBSD_WRPT;
+ return !!(csr & WBSD_WRPT);
}
static const struct mmc_host_ops wbsd_ops = {