181 lines
3.8 KiB
C
181 lines
3.8 KiB
C
/*
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* linux/drivers/mmc/core/host.c
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*
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* Copyright (C) 2003 Russell King, All Rights Reserved.
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* Copyright (C) 2007-2008 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 host class device management
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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/idr.h>
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#include <linux/pagemap.h>
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#include <linux/leds.h>
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#include <linux/mmc/host.h>
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#include "core.h"
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#include "host.h"
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#define cls_dev_to_mmc_host(d) container_of(d, struct mmc_host, class_dev)
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static void mmc_host_classdev_release(struct device *dev)
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{
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struct mmc_host *host = cls_dev_to_mmc_host(dev);
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kfree(host);
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}
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static struct class mmc_host_class = {
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.name = "mmc_host",
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.dev_release = mmc_host_classdev_release,
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};
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int mmc_register_host_class(void)
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{
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return class_register(&mmc_host_class);
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}
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void mmc_unregister_host_class(void)
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{
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class_unregister(&mmc_host_class);
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}
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static DEFINE_IDR(mmc_host_idr);
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static DEFINE_SPINLOCK(mmc_host_lock);
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/**
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* mmc_alloc_host - initialise the per-host structure.
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* @extra: sizeof private data structure
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* @dev: pointer to host device model structure
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*
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* Initialise the per-host structure.
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*/
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struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
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{
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int err;
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struct mmc_host *host;
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if (!idr_pre_get(&mmc_host_idr, GFP_KERNEL))
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return NULL;
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host = kzalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL);
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if (!host)
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return NULL;
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spin_lock(&mmc_host_lock);
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err = idr_get_new(&mmc_host_idr, host, &host->index);
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spin_unlock(&mmc_host_lock);
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if (err)
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goto free;
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dev_set_name(&host->class_dev, "mmc%d", host->index);
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host->parent = dev;
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host->class_dev.parent = dev;
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host->class_dev.class = &mmc_host_class;
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device_initialize(&host->class_dev);
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spin_lock_init(&host->lock);
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init_waitqueue_head(&host->wq);
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INIT_DELAYED_WORK(&host->detect, mmc_rescan);
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INIT_DELAYED_WORK_DEFERRABLE(&host->disable, mmc_host_deeper_disable);
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/*
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* By default, hosts do not support SGIO or large requests.
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* They have to set these according to their abilities.
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*/
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host->max_hw_segs = 1;
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host->max_phys_segs = 1;
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host->max_seg_size = PAGE_CACHE_SIZE;
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host->max_req_size = PAGE_CACHE_SIZE;
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host->max_blk_size = 512;
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host->max_blk_count = PAGE_CACHE_SIZE / 512;
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return host;
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free:
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kfree(host);
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return NULL;
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}
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EXPORT_SYMBOL(mmc_alloc_host);
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/**
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* mmc_add_host - initialise host hardware
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* @host: mmc host
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*
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* Register the host with the driver model. The host must be
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* prepared to start servicing requests before this function
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* completes.
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*/
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int mmc_add_host(struct mmc_host *host)
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{
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int err;
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WARN_ON((host->caps & MMC_CAP_SDIO_IRQ) &&
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!host->ops->enable_sdio_irq);
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led_trigger_register_simple(dev_name(&host->class_dev), &host->led);
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err = device_add(&host->class_dev);
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if (err)
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return err;
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#ifdef CONFIG_DEBUG_FS
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mmc_add_host_debugfs(host);
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#endif
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mmc_start_host(host);
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return 0;
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}
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EXPORT_SYMBOL(mmc_add_host);
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/**
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* mmc_remove_host - remove host hardware
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* @host: mmc host
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*
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* Unregister and remove all cards associated with this host,
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* and power down the MMC bus. No new requests will be issued
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* after this function has returned.
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*/
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void mmc_remove_host(struct mmc_host *host)
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{
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mmc_stop_host(host);
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#ifdef CONFIG_DEBUG_FS
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mmc_remove_host_debugfs(host);
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#endif
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device_del(&host->class_dev);
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led_trigger_unregister_simple(host->led);
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}
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EXPORT_SYMBOL(mmc_remove_host);
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/**
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* mmc_free_host - free the host structure
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* @host: mmc host
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*
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* Free the host once all references to it have been dropped.
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*/
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void mmc_free_host(struct mmc_host *host)
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{
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spin_lock(&mmc_host_lock);
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idr_remove(&mmc_host_idr, host->index);
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spin_unlock(&mmc_host_lock);
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put_device(&host->class_dev);
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}
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EXPORT_SYMBOL(mmc_free_host);
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