[PATCH 2/3] mmc: sdhci-acpi: support runtime PM for ACPI HID 80860F14 SD cards

Adrian Hunter
2013-05-06T09:12:39Z

Enable runtime PM for ACPI HID 80860F14 SD cards, adding support for
card detect GPIO.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
drivers/mmc/host/sdhci-acpi.c | 64 ++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 63 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/sdhci-acpi.c b/drivers/mmc/host/sdhci-acpi.c
index 706d9cb..17fceba 100644
--- a/drivers/mmc/host/sdhci-acpi.c
+++ b/drivers/mmc/host/sdhci-acpi.c
@@ -31,8 +31,10 @@
#include <linux/bitops.h>
#include <linux/types.h>
#include <linux/err.h>
+#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/acpi.h>
+#include <linux/acpi_gpio.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>

@@ -101,6 +103,8 @@ static const struct sdhci_acpi_slot sdhci_acpi_slot_int_sdio = {
};

static const struct sdhci_acpi_slot sdhci_acpi_slot_int_sd = {
+ .flags = SDHCI_ACPI_SD_CD | SDHCI_ACPI_RUNTIME_PM,
+ .quirks2 = SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON,
};

struct sdhci_acpi_uid_slot {
@@ -161,6 +165,57 @@ static const struct sdhci_acpi_slot *sdhci_acpi_get_slot(acpi_handle handle,
return slot;
}

+#ifdef CONFIG_PM_RUNTIME
+
+static irqreturn_t sdhci_acpi_sd_cd(int irq, void *dev_id)
+{
+ mmc_detect_change(dev_id, msecs_to_jiffies(200));
+ return IRQ_HANDLED;
+}
+
+static int sdhci_acpi_add_own_cd(struct device *dev, int gpio,
+ struct mmc_host *mmc)
+{
+ unsigned long flags;
+ int err, irq;
+
+ if (gpio < 0) {
+ err = gpio;
+ goto out;
+ }
+
+ err = devm_gpio_request_one(dev, gpio, GPIOF_DIR_IN, "sd_cd");
+ if (err)
+ goto out;
+
+ irq = gpio_to_irq(gpio);
+ if (irq < 0)
+ goto out_free;
+
+ flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING;
+ err = devm_request_irq(dev, irq, sdhci_acpi_sd_cd, flags, "sd_cd", mmc);
+ if (err)
+ goto out_free;
+
+ return 0;
+
+out_free:
+ devm_gpio_free(dev, gpio);
+out:
+ dev_warn(dev, "failed to setup card detect wake up\n");
+ return err;
+}
+
+#else
+
+static int sdhci_acpi_add_own_cd(struct device *dev, int gpio,
+ struct mmc_host *mmc)
+{
+ return 0;
+}
+
+#endif
+
static int sdhci_acpi_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@@ -171,7 +226,7 @@ static int sdhci_acpi_probe(struct platform_device *pdev)
struct resource *iomem;
resource_size_t len;
const char *hid;
- int err;
+ int err, gpio;

if (acpi_bus_get_device(handle, &device))
return -ENODEV;
@@ -196,6 +251,8 @@ static int sdhci_acpi_probe(struct platform_device *pdev)
if (IS_ERR(host))
return PTR_ERR(host);

+ gpio = acpi_get_gpio_by_index(dev, 0, NULL);
+
c = sdhci_priv(host);
c->host = host;
c->slot = sdhci_acpi_get_slot(handle, hid);
@@ -251,6 +308,11 @@ static int sdhci_acpi_probe(struct platform_device *pdev)
if (err)
goto err_free;

+ if (sdhci_acpi_flag(c, SDHCI_ACPI_SD_CD)) {
+ if (sdhci_acpi_add_own_cd(dev, gpio, host->mmc))
+ c->use_runtime_pm = false;
+ }
+
if (c->use_runtime_pm) {
pm_runtime_set_active(dev);
pm_suspend_ignore_children(dev, 1);
--
1.7.11.7