343 lines
6.9 KiB
C
343 lines
6.9 KiB
C
/*
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* linux/drivers/mmc/core/bus.c
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*
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* Copyright (C) 2003 Russell King, All Rights Reserved.
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* Copyright (C) 2007 Pierre Ossman
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* MMC card bus driver model
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*/
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/pm_runtime.h>
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#include <linux/mmc/card.h>
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#include <linux/mmc/host.h>
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#include "core.h"
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#include "sdio_cis.h"
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#include "bus.h"
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#define to_mmc_driver(d) container_of(d, struct mmc_driver, drv)
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static ssize_t mmc_type_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct mmc_card *card = mmc_dev_to_card(dev);
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switch (card->type) {
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case MMC_TYPE_MMC:
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return sprintf(buf, "MMC\n");
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case MMC_TYPE_SD:
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return sprintf(buf, "SD\n");
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case MMC_TYPE_SDIO:
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return sprintf(buf, "SDIO\n");
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case MMC_TYPE_SD_COMBO:
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return sprintf(buf, "SDcombo\n");
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default:
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return -EFAULT;
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}
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}
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static struct device_attribute mmc_dev_attrs[] = {
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__ATTR(type, S_IRUGO, mmc_type_show, NULL),
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__ATTR_NULL,
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};
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/*
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* This currently matches any MMC driver to any MMC card - drivers
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* themselves make the decision whether to drive this card in their
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* probe method.
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*/
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static int mmc_bus_match(struct device *dev, struct device_driver *drv)
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{
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return 1;
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}
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static int
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mmc_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
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{
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struct mmc_card *card = mmc_dev_to_card(dev);
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const char *type;
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int retval = 0;
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switch (card->type) {
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case MMC_TYPE_MMC:
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type = "MMC";
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break;
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case MMC_TYPE_SD:
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type = "SD";
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break;
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case MMC_TYPE_SDIO:
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type = "SDIO";
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break;
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case MMC_TYPE_SD_COMBO:
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type = "SDcombo";
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break;
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default:
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type = NULL;
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}
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if (type) {
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retval = add_uevent_var(env, "MMC_TYPE=%s", type);
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if (retval)
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return retval;
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}
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retval = add_uevent_var(env, "MMC_NAME=%s", mmc_card_name(card));
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if (retval)
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return retval;
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/*
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* Request the mmc_block device. Note: that this is a direct request
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* for the module it carries no information as to what is inserted.
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*/
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retval = add_uevent_var(env, "MODALIAS=mmc:block");
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return retval;
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}
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static int mmc_bus_probe(struct device *dev)
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{
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struct mmc_driver *drv = to_mmc_driver(dev->driver);
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struct mmc_card *card = mmc_dev_to_card(dev);
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return drv->probe(card);
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}
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static int mmc_bus_remove(struct device *dev)
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{
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struct mmc_driver *drv = to_mmc_driver(dev->driver);
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struct mmc_card *card = mmc_dev_to_card(dev);
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drv->remove(card);
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return 0;
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}
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static int mmc_bus_suspend(struct device *dev, pm_message_t state)
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{
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struct mmc_driver *drv = to_mmc_driver(dev->driver);
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struct mmc_card *card = mmc_dev_to_card(dev);
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int ret = 0;
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if (dev->driver && drv->suspend)
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ret = drv->suspend(card, state);
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return ret;
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}
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static int mmc_bus_resume(struct device *dev)
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{
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struct mmc_driver *drv = to_mmc_driver(dev->driver);
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struct mmc_card *card = mmc_dev_to_card(dev);
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int ret = 0;
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if (dev->driver && drv->resume)
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ret = drv->resume(card);
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return ret;
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}
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#ifdef CONFIG_PM_RUNTIME
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static int mmc_runtime_suspend(struct device *dev)
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{
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struct mmc_card *card = mmc_dev_to_card(dev);
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return mmc_power_save_host(card->host);
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}
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static int mmc_runtime_resume(struct device *dev)
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{
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struct mmc_card *card = mmc_dev_to_card(dev);
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return mmc_power_restore_host(card->host);
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}
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static int mmc_runtime_idle(struct device *dev)
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{
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return pm_runtime_suspend(dev);
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}
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static const struct dev_pm_ops mmc_bus_pm_ops = {
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.runtime_suspend = mmc_runtime_suspend,
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.runtime_resume = mmc_runtime_resume,
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.runtime_idle = mmc_runtime_idle,
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};
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#define MMC_PM_OPS_PTR (&mmc_bus_pm_ops)
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#else /* !CONFIG_PM_RUNTIME */
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#define MMC_PM_OPS_PTR NULL
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#endif /* !CONFIG_PM_RUNTIME */
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static struct bus_type mmc_bus_type = {
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.name = "mmc",
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.dev_attrs = mmc_dev_attrs,
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.match = mmc_bus_match,
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.uevent = mmc_bus_uevent,
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.probe = mmc_bus_probe,
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.remove = mmc_bus_remove,
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.suspend = mmc_bus_suspend,
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.resume = mmc_bus_resume,
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.pm = MMC_PM_OPS_PTR,
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};
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int mmc_register_bus(void)
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{
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return bus_register(&mmc_bus_type);
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}
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void mmc_unregister_bus(void)
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{
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bus_unregister(&mmc_bus_type);
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}
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/**
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* mmc_register_driver - register a media driver
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* @drv: MMC media driver
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*/
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int mmc_register_driver(struct mmc_driver *drv)
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{
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drv->drv.bus = &mmc_bus_type;
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return driver_register(&drv->drv);
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}
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EXPORT_SYMBOL(mmc_register_driver);
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/**
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* mmc_unregister_driver - unregister a media driver
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* @drv: MMC media driver
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*/
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void mmc_unregister_driver(struct mmc_driver *drv)
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{
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drv->drv.bus = &mmc_bus_type;
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driver_unregister(&drv->drv);
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}
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EXPORT_SYMBOL(mmc_unregister_driver);
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static void mmc_release_card(struct device *dev)
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{
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struct mmc_card *card = mmc_dev_to_card(dev);
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sdio_free_common_cis(card);
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if (card->info)
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kfree(card->info);
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kfree(card);
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}
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/*
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* Allocate and initialise a new MMC card structure.
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*/
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struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type)
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{
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struct mmc_card *card;
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card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL);
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if (!card)
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return ERR_PTR(-ENOMEM);
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card->host = host;
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device_initialize(&card->dev);
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card->dev.parent = mmc_classdev(host);
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card->dev.bus = &mmc_bus_type;
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card->dev.release = mmc_release_card;
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card->dev.type = type;
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return card;
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}
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/*
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* Register a new MMC card with the driver model.
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*/
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int mmc_add_card(struct mmc_card *card)
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{
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int ret;
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const char *type;
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dev_set_name(&card->dev, "%s:%04x", mmc_hostname(card->host), card->rca);
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switch (card->type) {
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case MMC_TYPE_MMC:
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type = "MMC";
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break;
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case MMC_TYPE_SD:
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type = "SD";
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if (mmc_card_blockaddr(card))
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type = "SDHC";
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break;
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case MMC_TYPE_SDIO:
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type = "SDIO";
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break;
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case MMC_TYPE_SD_COMBO:
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type = "SD-combo";
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if (mmc_card_blockaddr(card))
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type = "SDHC-combo";
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default:
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type = "?";
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break;
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}
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if (mmc_host_is_spi(card->host)) {
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printk(KERN_INFO "%s: new %s%s%s card on SPI\n",
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mmc_hostname(card->host),
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mmc_card_highspeed(card) ? "high speed " : "",
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mmc_card_ddr_mode(card) ? "DDR " : "",
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type);
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} else {
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printk(KERN_INFO "%s: new %s%s%s card at address %04x\n",
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mmc_hostname(card->host),
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mmc_card_highspeed(card) ? "high speed " : "",
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mmc_card_ddr_mode(card) ? "DDR " : "",
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type, card->rca);
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}
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ret = device_add(&card->dev);
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if (ret)
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return ret;
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#ifdef CONFIG_DEBUG_FS
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mmc_add_card_debugfs(card);
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#endif
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mmc_card_set_present(card);
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return 0;
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}
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/*
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* Unregister a new MMC card with the driver model, and
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* (eventually) free it.
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*/
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void mmc_remove_card(struct mmc_card *card)
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{
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#ifdef CONFIG_DEBUG_FS
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mmc_remove_card_debugfs(card);
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#endif
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if (mmc_card_present(card)) {
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if (mmc_host_is_spi(card->host)) {
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printk(KERN_INFO "%s: SPI card removed\n",
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mmc_hostname(card->host));
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} else {
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printk(KERN_INFO "%s: card %04x removed\n",
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mmc_hostname(card->host), card->rca);
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}
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device_del(&card->dev);
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}
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put_device(&card->dev);
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}
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