mmc: core: use a more generic name for slot function types and fields

struct mmc_host::hotplug is becoming a generic hook for slot functions.
Rename it accordingly.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Chris Ball <cjb@laptop.org>

3 files changed, 20 insertions, 7 deletions

diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
index 91c84c7a1829..b8c5290571f1 100644
--- a/drivers/mmc/core/host.c
+++ b/drivers/mmc/core/host.c
@@ -327,6 +327,8 @@ struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
 
         mmc_host_clk_init(host);
 
+        host->slot.cd_irq = -EINVAL;
+
         spin_lock_init(&host->lock);
         init_waitqueue_head(&host->wq);
         INIT_DELAYED_WORK(&host->detect, mmc_rescan);
diff --git a/drivers/mmc/core/slot-gpio.c b/drivers/mmc/core/slot-gpio.c
index 979671053436..468e5a0e5126 100644
--- a/drivers/mmc/core/slot-gpio.c
+++ b/drivers/mmc/core/slot-gpio.c
@@ -56,8 +56,8 @@ int mmc_gpio_request_cd(struct mmc_host *host, unsigned int gpio)
                 goto eirqreq;
 
         ctx->cd_gpio = gpio;
-        host->hotplug.irq = irq;
-        host->hotplug.handler_priv = ctx;
+        host->slot.cd_irq = irq;
+        host->slot.handler_priv = ctx;
 
         return 0;
 
@@ -71,12 +71,12 @@ EXPORT_SYMBOL(mmc_gpio_request_cd);
 
 void mmc_gpio_free_cd(struct mmc_host *host)
 {
-        struct mmc_gpio *ctx = host->hotplug.handler_priv;
+        struct mmc_gpio *ctx = host->slot.handler_priv;
 
         if (!ctx)
                 return;
 
-        free_irq(host->hotplug.irq, host);
+        free_irq(host->slot.cd_irq, host);
         gpio_free(ctx->cd_gpio);
         kfree(ctx);
 }
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 9deb725799e7..90b6a38b0374 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -150,8 +150,19 @@ struct mmc_async_req {
         int (*err_check) (struct mmc_card *, struct mmc_async_req *);
 };
 
-struct mmc_hotplug {
-        unsigned int irq;
+/**
+ * struct mmc_slot - MMC slot functions
+ *
+ * @cd_irq:             MMC/SD-card slot hotplug detection IRQ or -EINVAL
+ * @handler_priv:       MMC/SD-card slot context
+ *
+ * Some MMC/SD host controllers implement slot-functions like card and
+ * write-protect detection natively. However, a large number of controllers
+ * leave these functions to the CPU. This struct provides a hook to attach
+ * such slot-function drivers.
+ */
+struct mmc_slot {
+        int cd_irq;
         void *handler_priv;
 };
 
@@ -297,7 +308,7 @@ struct mmc_host {
 
         struct delayed_work     detect;
         int                     detect_change;  /* card detect flag */
-        struct mmc_hotplug      hotplug;
+        struct mmc_slot         slot;
 
         const struct mmc_bus_ops *bus_ops;      /* current bus driver */
         unsigned int            bus_refs;       /* reference counter */