130 lines
2.4 KiB
C
130 lines
2.4 KiB
C
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/*
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* linux/drivers/mmc/core/sdio_bus.c
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*
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* Copyright 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 as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* SDIO function 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/mmc/card.h>
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#include <linux/mmc/sdio_func.h>
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#include "sdio_bus.h"
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#define dev_to_sdio_func(d) container_of(d, struct sdio_func, dev)
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/*
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* This currently matches any SDIO function to any driver in order
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* to help initial development and testing.
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*/
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static int sdio_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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sdio_bus_uevent(struct device *dev, char **envp, int num_envp, char *buf,
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int buf_size)
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{
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envp[0] = NULL;
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return 0;
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}
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static int sdio_bus_probe(struct device *dev)
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{
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return -ENODEV;
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}
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static int sdio_bus_remove(struct device *dev)
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{
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return 0;
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}
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static struct bus_type sdio_bus_type = {
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.name = "sdio",
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.match = sdio_bus_match,
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.uevent = sdio_bus_uevent,
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.probe = sdio_bus_probe,
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.remove = sdio_bus_remove,
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};
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int sdio_register_bus(void)
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{
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return bus_register(&sdio_bus_type);
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}
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void sdio_unregister_bus(void)
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{
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bus_unregister(&sdio_bus_type);
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}
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static void sdio_release_func(struct device *dev)
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{
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struct sdio_func *func = dev_to_sdio_func(dev);
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kfree(func);
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}
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/*
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* Allocate and initialise a new SDIO function structure.
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*/
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struct sdio_func *sdio_alloc_func(struct mmc_card *card)
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{
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struct sdio_func *func;
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func = kmalloc(sizeof(struct sdio_func), GFP_KERNEL);
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if (!func)
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return ERR_PTR(-ENOMEM);
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memset(func, 0, sizeof(struct sdio_func));
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func->card = card;
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device_initialize(&func->dev);
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func->dev.parent = &card->dev;
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func->dev.bus = &sdio_bus_type;
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func->dev.release = sdio_release_func;
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return func;
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}
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/*
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* Register a new SDIO function with the driver model.
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*/
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int sdio_add_func(struct sdio_func *func)
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{
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int ret;
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snprintf(func->dev.bus_id, sizeof(func->dev.bus_id),
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"%s:%d", mmc_card_id(func->card), func->num);
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ret = device_add(&func->dev);
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if (ret == 0)
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sdio_func_set_present(func);
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return ret;
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}
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/*
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* Unregister a SDIO function with the driver model, and
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* (eventually) free it.
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*/
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void sdio_remove_func(struct sdio_func *func)
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{
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if (sdio_func_present(func))
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device_del(&func->dev);
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put_device(&func->dev);
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}
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