mmc: sdhci-acpi: support runtime PM for ACPI HID 80860F14 SD cards

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

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 63 insertions, 1 deletions

diff --git a/drivers/mmc/host/sdhci-acpi.c b/drivers/mmc/host/sdhci-acpi.c
index b1a6588b50fa..a51e603acbc5 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);