mmc: basic SDIO device model
Add the sdio bus type and basic device handling.
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
diff --git a/drivers/mmc/core/sdio_bus.c b/drivers/mmc/core/sdio_bus.c
new file mode 100644
index 0000000..59c909e
--- /dev/null
+++ b/drivers/mmc/core/sdio_bus.c
@@ -0,0 +1,129 @@
+/*
+ * linux/drivers/mmc/core/sdio_bus.c
+ *
+ * Copyright 2007 Pierre Ossman
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ *
+ * SDIO function driver model
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+
+#include <linux/mmc/card.h>
+#include <linux/mmc/sdio_func.h>
+
+#include "sdio_bus.h"
+
+#define dev_to_sdio_func(d) container_of(d, struct sdio_func, dev)
+
+/*
+ * This currently matches any SDIO function to any driver in order
+ * to help initial development and testing.
+ */
+static int sdio_bus_match(struct device *dev, struct device_driver *drv)
+{
+ return 1;
+}
+
+static int
+sdio_bus_uevent(struct device *dev, char **envp, int num_envp, char *buf,
+ int buf_size)
+{
+ envp[0] = NULL;
+
+ return 0;
+}
+
+static int sdio_bus_probe(struct device *dev)
+{
+ return -ENODEV;
+}
+
+static int sdio_bus_remove(struct device *dev)
+{
+ return 0;
+}
+
+static struct bus_type sdio_bus_type = {
+ .name = "sdio",
+ .match = sdio_bus_match,
+ .uevent = sdio_bus_uevent,
+ .probe = sdio_bus_probe,
+ .remove = sdio_bus_remove,
+};
+
+int sdio_register_bus(void)
+{
+ return bus_register(&sdio_bus_type);
+}
+
+void sdio_unregister_bus(void)
+{
+ bus_unregister(&sdio_bus_type);
+}
+
+static void sdio_release_func(struct device *dev)
+{
+ struct sdio_func *func = dev_to_sdio_func(dev);
+
+ kfree(func);
+}
+
+/*
+ * Allocate and initialise a new SDIO function structure.
+ */
+struct sdio_func *sdio_alloc_func(struct mmc_card *card)
+{
+ struct sdio_func *func;
+
+ func = kmalloc(sizeof(struct sdio_func), GFP_KERNEL);
+ if (!func)
+ return ERR_PTR(-ENOMEM);
+
+ memset(func, 0, sizeof(struct sdio_func));
+
+ func->card = card;
+
+ device_initialize(&func->dev);
+
+ func->dev.parent = &card->dev;
+ func->dev.bus = &sdio_bus_type;
+ func->dev.release = sdio_release_func;
+
+ return func;
+}
+
+/*
+ * Register a new SDIO function with the driver model.
+ */
+int sdio_add_func(struct sdio_func *func)
+{
+ int ret;
+
+ snprintf(func->dev.bus_id, sizeof(func->dev.bus_id),
+ "%s:%d", mmc_card_id(func->card), func->num);
+
+ ret = device_add(&func->dev);
+ if (ret == 0)
+ sdio_func_set_present(func);
+
+ return ret;
+}
+
+/*
+ * Unregister a SDIO function with the driver model, and
+ * (eventually) free it.
+ */
+void sdio_remove_func(struct sdio_func *func)
+{
+ if (sdio_func_present(func))
+ device_del(&func->dev);
+
+ put_device(&func->dev);
+}
+