2 * linux/drivers/mmc/core/host.c
4 * Copyright (C) 2003 Russell King, All Rights Reserved.
5 * Copyright (C) 2007-2008 Pierre Ossman
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
11 * MMC host class device management
14 #include <linux/device.h>
15 #include <linux/err.h>
16 #include <linux/idr.h>
17 #include <linux/pagemap.h>
18 #include <linux/leds.h>
19 #include <linux/slab.h>
21 #include <linux/mmc/host.h>
26 #define cls_dev_to_mmc_host(d) container_of(d, struct mmc_host, class_dev)
28 static void mmc_host_classdev_release(struct device *dev)
30 struct mmc_host *host = cls_dev_to_mmc_host(dev);
34 static struct class mmc_host_class = {
36 .dev_release = mmc_host_classdev_release,
39 int mmc_register_host_class(void)
41 return class_register(&mmc_host_class);
44 void mmc_unregister_host_class(void)
46 class_unregister(&mmc_host_class);
49 static DEFINE_IDR(mmc_host_idr);
50 static DEFINE_SPINLOCK(mmc_host_lock);
53 * mmc_alloc_host - initialise the per-host structure.
54 * @extra: sizeof private data structure
55 * @dev: pointer to host device model structure
57 * Initialise the per-host structure.
59 struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
62 struct mmc_host *host;
64 if (!idr_pre_get(&mmc_host_idr, GFP_KERNEL))
67 host = kzalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL);
71 spin_lock(&mmc_host_lock);
72 err = idr_get_new(&mmc_host_idr, host, &host->index);
73 spin_unlock(&mmc_host_lock);
77 dev_set_name(&host->class_dev, "mmc%d", host->index);
80 host->class_dev.parent = dev;
81 host->class_dev.class = &mmc_host_class;
82 device_initialize(&host->class_dev);
84 spin_lock_init(&host->lock);
85 init_waitqueue_head(&host->wq);
86 INIT_DELAYED_WORK(&host->detect, mmc_rescan);
87 INIT_DELAYED_WORK_DEFERRABLE(&host->disable, mmc_host_deeper_disable);
90 * By default, hosts do not support SGIO or large requests.
91 * They have to set these according to their abilities.
93 host->max_hw_segs = 1;
94 host->max_phys_segs = 1;
95 host->max_seg_size = PAGE_CACHE_SIZE;
97 host->max_req_size = PAGE_CACHE_SIZE;
98 host->max_blk_size = 512;
99 host->max_blk_count = PAGE_CACHE_SIZE / 512;
108 EXPORT_SYMBOL(mmc_alloc_host);
111 * mmc_add_host - initialise host hardware
114 * Register the host with the driver model. The host must be
115 * prepared to start servicing requests before this function
118 int mmc_add_host(struct mmc_host *host)
122 WARN_ON((host->caps & MMC_CAP_SDIO_IRQ) &&
123 !host->ops->enable_sdio_irq);
125 led_trigger_register_simple(dev_name(&host->class_dev), &host->led);
127 err = device_add(&host->class_dev);
131 #ifdef CONFIG_DEBUG_FS
132 mmc_add_host_debugfs(host);
135 mmc_start_host(host);
140 EXPORT_SYMBOL(mmc_add_host);
143 * mmc_remove_host - remove host hardware
146 * Unregister and remove all cards associated with this host,
147 * and power down the MMC bus. No new requests will be issued
148 * after this function has returned.
150 void mmc_remove_host(struct mmc_host *host)
154 #ifdef CONFIG_DEBUG_FS
155 mmc_remove_host_debugfs(host);
158 device_del(&host->class_dev);
160 led_trigger_unregister_simple(host->led);
163 EXPORT_SYMBOL(mmc_remove_host);
166 * mmc_free_host - free the host structure
169 * Free the host once all references to it have been dropped.
171 void mmc_free_host(struct mmc_host *host)
173 spin_lock(&mmc_host_lock);
174 idr_remove(&mmc_host_idr, host->index);
175 spin_unlock(&mmc_host_lock);
177 put_device(&host->class_dev);
180 EXPORT_SYMBOL(mmc_free_host);