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mmc: atmel-mci: add suspend/resume support

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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>
This commit is contained in:
Nicolas Ferre 2011-07-06 11:31:36 +02:00 • committed by Chris Ball
parent 0d013bcf5c
commit 5c2f2b9bd0
1 changed files with 63 additions and 0 deletions
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63
drivers/mmc/host/atmel-mci.c
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@ -203,6 +203,7 @@ struct atmel_mci_slot {
#define ATMCI_CARD_PRESENT 0 #define ATMCI_CARD_PRESENT 0
#define ATMCI_CARD_NEED_INIT 1 #define ATMCI_CARD_NEED_INIT 1
#define ATMCI_SHUTDOWN 2 #define ATMCI_SHUTDOWN 2
#define ATMCI_SUSPENDED 3
int detect_pin; int detect_pin;
int wp_pin; int wp_pin;
@ -1878,10 +1879,72 @@ static int __exit atmci_remove(struct platform_device *pdev)
return 0; 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 = { static struct platform_driver atmci_driver = {
.remove = __exit_p(atmci_remove), .remove = __exit_p(atmci_remove),
.driver = { .driver = {
.name = "atmel_mci", .name = "atmel_mci",
.pm = ATMCI_PM_OPS,
}, },
}; };