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authorPierre Ossman <drzeus@drzeus.cx>2007-05-19 13:39:01 +0200
committerPierre Ossman <drzeus@drzeus.cx>2007-07-09 21:27:56 +0200
commit4101c16a910b15afd190c6bc7d45864461cf5c25 (patch)
tree76d88e3bfd6723fc86c13c635b3c2b73c73c6978 /drivers/mmc/core/bus.c
parent7de064ebc67d9baf6c933d3a7046feb9b4eced05 (diff)
mmc: refactor bus operations
Move bus operations to its own file for the sake of clarity. Also delegate sysfs attributes to bus handlers in preparation for other more exotic types. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
Diffstat (limited to 'drivers/mmc/core/bus.c')
-rw-r--r--drivers/mmc/core/bus.c253
1 files changed, 253 insertions, 0 deletions
diff --git a/drivers/mmc/core/bus.c b/drivers/mmc/core/bus.c
new file mode 100644
index 00000000000..348b566bf4f
--- /dev/null
+++ b/drivers/mmc/core/bus.c
@@ -0,0 +1,253 @@
+/*
+ * linux/drivers/mmc/core/bus.c
+ *
+ * Copyright (C) 2003 Russell King, All Rights Reserved.
+ * Copyright (C) 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 version 2 as
+ * published by the Free Software Foundation.
+ *
+ * MMC card bus driver model
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+
+#include <linux/mmc/card.h>
+#include <linux/mmc/host.h>
+
+#include "sysfs.h"
+#include "core.h"
+#include "bus.h"
+
+#define dev_to_mmc_card(d) container_of(d, struct mmc_card, dev)
+#define to_mmc_driver(d) container_of(d, struct mmc_driver, drv)
+
+static ssize_t mmc_type_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct mmc_card *card = dev_to_mmc_card(dev);
+
+ switch (card->type) {
+ case MMC_TYPE_MMC:
+ return sprintf(buf, "MMC\n");
+ case MMC_TYPE_SD:
+ return sprintf(buf, "SD\n");
+ default:
+ return -EFAULT;
+ }
+}
+
+static struct device_attribute mmc_dev_attrs[] = {
+ MMC_ATTR_RO(type),
+ __ATTR_NULL,
+};
+
+/*
+ * This currently matches any MMC driver to any MMC card - drivers
+ * themselves make the decision whether to drive this card in their
+ * probe method.
+ */
+static int mmc_bus_match(struct device *dev, struct device_driver *drv)
+{
+ return 1;
+}
+
+static int
+mmc_bus_uevent(struct device *dev, char **envp, int num_envp, char *buf,
+ int buf_size)
+{
+ struct mmc_card *card = dev_to_mmc_card(dev);
+ int retval = 0, i = 0, length = 0;
+
+#define add_env(fmt,val) do { \
+ retval = add_uevent_var(envp, num_envp, &i, \
+ buf, buf_size, &length, \
+ fmt, val); \
+ if (retval) \
+ return retval; \
+} while (0);
+
+ switch (card->type) {
+ case MMC_TYPE_MMC:
+ add_env("MMC_TYPE=%s", "MMC");
+ break;
+ case MMC_TYPE_SD:
+ add_env("MMC_TYPE=%s", "SD");
+ break;
+ }
+
+ add_env("MMC_NAME=%s", mmc_card_name(card));
+
+#undef add_env
+
+ envp[i] = NULL;
+
+ return 0;
+}
+
+static int mmc_bus_probe(struct device *dev)
+{
+ struct mmc_driver *drv = to_mmc_driver(dev->driver);
+ struct mmc_card *card = dev_to_mmc_card(dev);
+
+ return drv->probe(card);
+}
+
+static int mmc_bus_remove(struct device *dev)
+{
+ struct mmc_driver *drv = to_mmc_driver(dev->driver);
+ struct mmc_card *card = dev_to_mmc_card(dev);
+
+ drv->remove(card);
+
+ return 0;
+}
+
+static int mmc_bus_suspend(struct device *dev, pm_message_t state)
+{
+ struct mmc_driver *drv = to_mmc_driver(dev->driver);
+ struct mmc_card *card = dev_to_mmc_card(dev);
+ int ret = 0;
+
+ if (dev->driver && drv->suspend)
+ ret = drv->suspend(card, state);
+ return ret;
+}
+
+static int mmc_bus_resume(struct device *dev)
+{
+ struct mmc_driver *drv = to_mmc_driver(dev->driver);
+ struct mmc_card *card = dev_to_mmc_card(dev);
+ int ret = 0;
+
+ if (dev->driver && drv->resume)
+ ret = drv->resume(card);
+ return ret;
+}
+
+static struct bus_type mmc_bus_type = {
+ .name = "mmc",
+ .dev_attrs = mmc_dev_attrs,
+ .match = mmc_bus_match,
+ .uevent = mmc_bus_uevent,
+ .probe = mmc_bus_probe,
+ .remove = mmc_bus_remove,
+ .suspend = mmc_bus_suspend,
+ .resume = mmc_bus_resume,
+};
+
+int mmc_register_bus(void)
+{
+ return bus_register(&mmc_bus_type);
+}
+
+void mmc_unregister_bus(void)
+{
+ bus_unregister(&mmc_bus_type);
+}
+
+/**
+ * mmc_register_driver - register a media driver
+ * @drv: MMC media driver
+ */
+int mmc_register_driver(struct mmc_driver *drv)
+{
+ drv->drv.bus = &mmc_bus_type;
+ return driver_register(&drv->drv);
+}
+
+EXPORT_SYMBOL(mmc_register_driver);
+
+/**
+ * mmc_unregister_driver - unregister a media driver
+ * @drv: MMC media driver
+ */
+void mmc_unregister_driver(struct mmc_driver *drv)
+{
+ drv->drv.bus = &mmc_bus_type;
+ driver_unregister(&drv->drv);
+}
+
+EXPORT_SYMBOL(mmc_unregister_driver);
+
+static void mmc_release_card(struct device *dev)
+{
+ struct mmc_card *card = dev_to_mmc_card(dev);
+
+ kfree(card);
+}
+
+/*
+ * Allocate and initialise a new MMC card structure.
+ */
+struct mmc_card *mmc_alloc_card(struct mmc_host *host)
+{
+ struct mmc_card *card;
+
+ card = kmalloc(sizeof(struct mmc_card), GFP_KERNEL);
+ if (!card)
+ return ERR_PTR(-ENOMEM);
+
+ memset(card, 0, sizeof(struct mmc_card));
+
+ card->host = host;
+
+ device_initialize(&card->dev);
+
+ card->dev.parent = mmc_classdev(host);
+ card->dev.bus = &mmc_bus_type;
+ card->dev.release = mmc_release_card;
+
+ return card;
+}
+
+/*
+ * Register a new MMC card with the driver model.
+ */
+int mmc_add_card(struct mmc_card *card)
+{
+ int ret;
+
+ snprintf(card->dev.bus_id, sizeof(card->dev.bus_id),
+ "%s:%04x", mmc_hostname(card->host), card->rca);
+
+ card->dev.uevent_suppress = 1;
+
+ ret = device_add(&card->dev);
+ if (ret)
+ return ret;
+
+ if (card->host->bus_ops->sysfs_add) {
+ ret = card->host->bus_ops->sysfs_add(card->host, card);
+ if (ret) {
+ device_del(&card->dev);
+ return ret;
+ }
+ }
+
+ card->dev.uevent_suppress = 0;
+
+ kobject_uevent(&card->dev.kobj, KOBJ_ADD);
+
+ mmc_card_set_present(card);
+
+ return 0;
+}
+
+/*
+ * Unregister a new MMC card with the driver model, and
+ * (eventually) free it.
+ */
+void mmc_remove_card(struct mmc_card *card)
+{
+ if (mmc_card_present(card)) {
+ if (card->host->bus_ops->sysfs_remove)
+ card->host->bus_ops->sysfs_remove(card->host, card);
+ device_del(&card->dev);
+ }
+
+ put_device(&card->dev);
+}
+