mmc: sh_mobile_sdhi: support modular mmc-core with non-standard hotplug

Currently if a platform wants to implement a non-standard card-detection
method, it would need to call tmio_mmc_cd_wakeup(), which is an inline
function, calling mmc_detect_change(). For this the platform would have
to link mmc_core statically into the kernel, losing the ability to build
it as a module. This patch adds a callback to the sh_mobile_sdhi driver,
which eliminates this dependency.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Acked-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Chris Ball <cjb@laptop.org>

2 files changed, 20 insertions, 2 deletions

diff --git a/drivers/mmc/host/sh_mobile_sdhi.c b/drivers/mmc/host/sh_mobile_sdhi.c
index 07ff3fee77b3..934b68e9efc3 100644
--- a/drivers/mmc/host/sh_mobile_sdhi.c
+++ b/drivers/mmc/host/sh_mobile_sdhi.c
@@ -90,6 +90,15 @@ static int sh_mobile_sdhi_write16_hook(struct tmio_mmc_host *host, int addr)
         return 0;
 }
 
+static void sh_mobile_sdhi_cd_wakeup(const struct platform_device *pdev)
+{
+        mmc_detect_change(dev_get_drvdata(&pdev->dev), msecs_to_jiffies(100));
+}
+
+static const struct sh_mobile_sdhi_ops sdhi_ops = {
+        .cd_wakeup = sh_mobile_sdhi_cd_wakeup,
+};
+
 static int __devinit sh_mobile_sdhi_probe(struct platform_device *pdev)
 {
         struct sh_mobile_sdhi *priv;
@@ -110,7 +119,7 @@ static int __devinit sh_mobile_sdhi_probe(struct platform_device *pdev)
         p->pdata = mmc_data;
 
         if (p->init) {
-                ret = p->init(pdev);
+                ret = p->init(pdev, &sdhi_ops);
                 if (ret)
                         goto einit;
         }
diff --git a/include/linux/mmc/sh_mobile_sdhi.h b/include/linux/mmc/sh_mobile_sdhi.h
index 686b85bfb7a5..e94e620aeddc 100644
--- a/include/linux/mmc/sh_mobile_sdhi.h
+++ b/include/linux/mmc/sh_mobile_sdhi.h
@@ -10,6 +10,14 @@ struct tmio_mmc_data;
 #define SH_MOBILE_SDHI_IRQ_SDCARD       "sdcard"
 #define SH_MOBILE_SDHI_IRQ_SDIO         "sdio"
 
+/**
+ * struct sh_mobile_sdhi_ops - SDHI driver callbacks
+ * @cd_wakeup:          trigger a card-detection run
+ */
+struct sh_mobile_sdhi_ops {
+        void (*cd_wakeup)(const struct platform_device *pdev);
+};
+
 struct sh_mobile_sdhi_info {
         int dma_slave_tx;
         int dma_slave_rx;
@@ -22,7 +30,8 @@ struct sh_mobile_sdhi_info {
         int (*get_cd)(struct platform_device *pdev);
 
         /* callbacks for board specific setup code */
-        int (*init)(struct platform_device *pdev);
+        int (*init)(struct platform_device *pdev,
+                    const struct sh_mobile_sdhi_ops *ops);
         void (*cleanup)(struct platform_device *pdev);
 };