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authorNicolas Ferre <nicolas.ferre@atmel.com>2011-07-06 11:31:36 +0200
committerChris Ball <cjb@laptop.org>2011-07-20 17:21:08 -0400
commit5c2f2b9bd0db84eabaf0d2cf7a9392a1581c2545 (patch)
tree0134291f090cf26426c6856cb544e009fd74b281 /drivers/mmc
parent0d013bcf5c272faea1f8e7a5ef3cb2e98103d5cb (diff)
mmc: atmel-mci: add suspend/resume support
Take care of slots while going to suspend state. Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com> Reviewed-by: Felipe Balbi <balbi@ti.com> Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/host/atmel-mci.c63
1 files changed, 63 insertions, 0 deletions
diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
index aa8039f473c..fa8cae1d700 100644
--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -203,6 +203,7 @@ struct atmel_mci_slot {
#define ATMCI_CARD_PRESENT 0
#define ATMCI_CARD_NEED_INIT 1
#define ATMCI_SHUTDOWN 2
+#define ATMCI_SUSPENDED 3
int detect_pin;
int wp_pin;
@@ -1878,10 +1879,72 @@ static int __exit atmci_remove(struct platform_device *pdev)
return 0;
}
+#ifdef CONFIG_PM
+static int atmci_suspend(struct device *dev)
+{
+ struct atmel_mci *host = dev_get_drvdata(dev);
+ int i;
+
+ for (i = 0; i < ATMEL_MCI_MAX_NR_SLOTS; i++) {
+ struct atmel_mci_slot *slot = host->slot[i];
+ int ret;
+
+ if (!slot)
+ continue;
+ ret = mmc_suspend_host(slot->mmc);
+ if (ret < 0) {
+ while (--i >= 0) {
+ slot = host->slot[i];
+ if (slot
+ && test_bit(ATMCI_SUSPENDED, &slot->flags)) {
+ mmc_resume_host(host->slot[i]->mmc);
+ clear_bit(ATMCI_SUSPENDED, &slot->flags);
+ }
+ }
+ return ret;
+ } else {
+ set_bit(ATMCI_SUSPENDED, &slot->flags);
+ }
+ }
+
+ return 0;
+}
+
+static int atmci_resume(struct device *dev)
+{
+ struct atmel_mci *host = dev_get_drvdata(dev);
+ int i;
+ int ret = 0;
+
+ for (i = 0; i < ATMEL_MCI_MAX_NR_SLOTS; i++) {
+ struct atmel_mci_slot *slot = host->slot[i];
+ int err;
+
+ slot = host->slot[i];
+ if (!slot)
+ continue;
+ if (!test_bit(ATMCI_SUSPENDED, &slot->flags))
+ continue;
+ err = mmc_resume_host(slot->mmc);
+ if (err < 0)
+ ret = err;
+ else
+ clear_bit(ATMCI_SUSPENDED, &slot->flags);
+ }
+
+ return ret;
+}
+static SIMPLE_DEV_PM_OPS(atmci_pm, atmci_suspend, atmci_resume);
+#define ATMCI_PM_OPS (&atmci_pm)
+#else
+#define ATMCI_PM_OPS NULL
+#endif
+
static struct platform_driver atmci_driver = {
.remove = __exit_p(atmci_remove),
.driver = {
.name = "atmel_mci",
+ .pm = ATMCI_PM_OPS,
},
};