mmc: basic SDIO device model

Add the sdio bus type and basic device handling.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
This commit is contained in:
Pierre Ossman 2007-05-26 13:48:18 +02:00
parent b2bcc798bb
commit e29a7d73f4
7 changed files with 279 additions and 15 deletions

View File

@ -9,5 +9,5 @@ endif
obj-$(CONFIG_MMC) += mmc_core.o
mmc_core-y := core.o sysfs.o bus.o host.o \
mmc.o mmc_ops.o sd.o sd_ops.o \
sdio.o sdio_ops.o
sdio.o sdio_ops.o sdio_bus.o

View File

@ -29,6 +29,7 @@
#include "core.h"
#include "bus.h"
#include "host.h"
#include "sdio_bus.h"
#include "mmc_ops.h"
#include "sd_ops.h"
@ -739,16 +740,32 @@ static int __init mmc_init(void)
return -ENOMEM;
ret = mmc_register_bus();
if (ret == 0) {
ret = mmc_register_host_class();
if (ret)
mmc_unregister_bus();
}
if (ret)
goto destroy_workqueue;
ret = mmc_register_host_class();
if (ret)
goto unregister_bus;
ret = sdio_register_bus();
if (ret)
goto unregister_host_class;
return 0;
unregister_host_class:
mmc_unregister_host_class();
unregister_bus:
mmc_unregister_bus();
destroy_workqueue:
destroy_workqueue(workqueue);
return ret;
}
static void __exit mmc_exit(void)
{
sdio_unregister_bus();
mmc_unregister_host_class();
mmc_unregister_bus();
destroy_workqueue(workqueue);

View File

@ -13,21 +13,49 @@
#include <linux/mmc/host.h>
#include <linux/mmc/card.h>
#include <linux/mmc/sdio_func.h>
#include "core.h"
#include "bus.h"
#include "sdio_bus.h"
#include "mmc_ops.h"
#include "sd_ops.h"
#include "sdio_ops.h"
static int sdio_init_func(struct mmc_card *card, unsigned int fn)
{
struct sdio_func *func;
BUG_ON(fn > SDIO_MAX_FUNCS);
func = sdio_alloc_func(card);
if (IS_ERR(func))
return PTR_ERR(func);
func->num = fn;
card->sdio_func[fn - 1] = func;
return 0;
}
/*
* Host is being removed. Free up the current card.
*/
static void mmc_sdio_remove(struct mmc_host *host)
{
int i;
BUG_ON(!host);
BUG_ON(!host->card);
for (i = 0;i < host->card->sdio_funcs;i++) {
if (host->card->sdio_func[i]) {
sdio_remove_func(host->card->sdio_func[i]);
host->card->sdio_func[i] = NULL;
}
}
mmc_remove_card(host->card);
host->card = NULL;
}
@ -73,7 +101,7 @@ static const struct mmc_bus_ops mmc_sdio_ops = {
int mmc_attach_sdio(struct mmc_host *host, u32 ocr)
{
int err;
int funcs;
int i, funcs;
struct mmc_card *card;
BUG_ON(!host);
@ -132,13 +160,16 @@ int mmc_attach_sdio(struct mmc_host *host, u32 ocr)
}
card->type = MMC_TYPE_SDIO;
card->sdio_funcs = funcs;
host->card = card;
/*
* Set card RCA.
*/
err = mmc_send_relative_addr(host, &card->rca);
if (err)
goto free_card;
goto remove;
mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
@ -147,23 +178,46 @@ int mmc_attach_sdio(struct mmc_host *host, u32 ocr)
*/
err = mmc_select_card(card);
if (err)
goto free_card;
goto remove;
host->card = card;
/*
* Initialize (but don't add) all present functions.
*/
for (i = 0;i < funcs;i++) {
err = sdio_init_func(host->card, i + 1);
if (err)
goto remove;
}
mmc_release_host(host);
/*
* First add the card to the driver model...
*/
err = mmc_add_card(host->card);
if (err)
goto reclaim_host;
goto remove_added;
/*
* ...then the SDIO functions.
*/
for (i = 0;i < funcs;i++) {
err = sdio_add_func(host->card->sdio_func[i]);
if (err)
goto remove_added;
}
return 0;
reclaim_host:
remove_added:
/* Remove without lock if the device has been added. */
mmc_sdio_remove(host);
mmc_claim_host(host);
free_card:
mmc_remove_card(card);
host->card = NULL;
remove:
/* And with lock if it hasn't been added. */
if (host->card)
mmc_sdio_remove(host);
err:
mmc_detach_bus(host);
mmc_release_host(host);

129
drivers/mmc/core/sdio_bus.c Normal file
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@ -0,0 +1,129 @@
/*
* linux/drivers/mmc/core/sdio_bus.c
*
* Copyright 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 as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* SDIO function driver model
*/
#include <linux/device.h>
#include <linux/err.h>
#include <linux/mmc/card.h>
#include <linux/mmc/sdio_func.h>
#include "sdio_bus.h"
#define dev_to_sdio_func(d) container_of(d, struct sdio_func, dev)
/*
* This currently matches any SDIO function to any driver in order
* to help initial development and testing.
*/
static int sdio_bus_match(struct device *dev, struct device_driver *drv)
{
return 1;
}
static int
sdio_bus_uevent(struct device *dev, char **envp, int num_envp, char *buf,
int buf_size)
{
envp[0] = NULL;
return 0;
}
static int sdio_bus_probe(struct device *dev)
{
return -ENODEV;
}
static int sdio_bus_remove(struct device *dev)
{
return 0;
}
static struct bus_type sdio_bus_type = {
.name = "sdio",
.match = sdio_bus_match,
.uevent = sdio_bus_uevent,
.probe = sdio_bus_probe,
.remove = sdio_bus_remove,
};
int sdio_register_bus(void)
{
return bus_register(&sdio_bus_type);
}
void sdio_unregister_bus(void)
{
bus_unregister(&sdio_bus_type);
}
static void sdio_release_func(struct device *dev)
{
struct sdio_func *func = dev_to_sdio_func(dev);
kfree(func);
}
/*
* Allocate and initialise a new SDIO function structure.
*/
struct sdio_func *sdio_alloc_func(struct mmc_card *card)
{
struct sdio_func *func;
func = kmalloc(sizeof(struct sdio_func), GFP_KERNEL);
if (!func)
return ERR_PTR(-ENOMEM);
memset(func, 0, sizeof(struct sdio_func));
func->card = card;
device_initialize(&func->dev);
func->dev.parent = &card->dev;
func->dev.bus = &sdio_bus_type;
func->dev.release = sdio_release_func;
return func;
}
/*
* Register a new SDIO function with the driver model.
*/
int sdio_add_func(struct sdio_func *func)
{
int ret;
snprintf(func->dev.bus_id, sizeof(func->dev.bus_id),
"%s:%d", mmc_card_id(func->card), func->num);
ret = device_add(&func->dev);
if (ret == 0)
sdio_func_set_present(func);
return ret;
}
/*
* Unregister a SDIO function with the driver model, and
* (eventually) free it.
*/
void sdio_remove_func(struct sdio_func *func)
{
if (sdio_func_present(func))
device_del(&func->dev);
put_device(&func->dev);
}

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@ -0,0 +1,22 @@
/*
* linux/drivers/mmc/core/sdio_bus.h
*
* Copyright 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 as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*/
#ifndef _MMC_CORE_SDIO_BUS_H
#define _MMC_CORE_SDIO_BUS_H
struct sdio_func *sdio_alloc_func(struct mmc_card *card);
int sdio_add_func(struct sdio_func *func);
void sdio_remove_func(struct sdio_func *func);
int sdio_register_bus(void);
void sdio_unregister_bus(void);
#endif

View File

@ -56,6 +56,9 @@ struct sd_switch_caps {
};
struct mmc_host;
struct sdio_func;
#define SDIO_MAX_FUNCS 7
/*
* MMC device
@ -73,6 +76,7 @@ struct mmc_card {
#define MMC_STATE_READONLY (1<<1) /* card is read-only */
#define MMC_STATE_HIGHSPEED (1<<2) /* card is in high speed mode */
#define MMC_STATE_BLOCKADDR (1<<3) /* card uses block-addressing */
u32 raw_cid[4]; /* raw card CID */
u32 raw_csd[4]; /* raw card CSD */
u32 raw_scr[2]; /* raw card SCR */
@ -81,6 +85,9 @@ struct mmc_card {
struct mmc_ext_csd ext_csd; /* mmc v4 extended card specific */
struct sd_scr scr; /* extra SD information */
struct sd_switch_caps sw_caps; /* switch (CMD6) caps */
unsigned int sdio_funcs; /* number of SDIO functions */
struct sdio_func *sdio_func[SDIO_MAX_FUNCS]; /* SDIO functions (devices) */
};
#define mmc_card_mmc(c) ((c)->type == MMC_TYPE_MMC)

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@ -0,0 +1,35 @@
/*
* include/linux/mmc/sdio_func.h
*
* Copyright 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 as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*/
#ifndef MMC_SDIO_FUNC_H
#define MMC_SDIO_FUNC_H
struct mmc_card;
/*
* SDIO function devices
*/
struct sdio_func {
struct mmc_card *card; /* the card this device belongs to */
struct device dev; /* the device */
unsigned int num; /* function number */
unsigned int state; /* function state */
#define SDIO_STATE_PRESENT (1<<0) /* present in sysfs */
};
#define sdio_func_present(f) ((f)->state & SDIO_STATE_PRESENT)
#define sdio_func_set_present(f) ((f)->state |= SDIO_STATE_PRESENT)
#define sdio_func_id(f) ((f)->dev.bus_id)
#endif