drivers/mmc/core/sdio_cis.c

/*
 * linux/drivers/mmc/core/sdio_cis.c
 *
 * Author:	Nicolas Pitre
 * Created:	June 11, 2007
 * Copyright:	MontaVista Software Inc.
 *
 * 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.
 */

#include <linux/kernel.h>

#include <linux/mmc/host.h>
#include <linux/mmc/sdio.h>
#include <linux/mmc/sdio_func.h>

#include "sdio_cis.h"
#include "sdio_ops.h"

static int cistpl_manfid(struct sdio_func *func,
			 const unsigned char *buf,
			 unsigned size)
{
	/* TPLMID_MANF */
	func->vendor = buf[0] | (buf[1] << 8);

	/* TPLMID_CARD */
	func->device = buf[2] | (buf[3] << 8);

	return 0;
}

struct cis_tpl {
	unsigned char code;
	unsigned char min_size;
	int (*parse)(struct sdio_func *, const unsigned char *buf, unsigned size);
};

static const struct cis_tpl cis_tpl_list[] = {
	{	0x15,	3,	/* cistpl_vers_1 */	},
	{	0x20,	4,	cistpl_manfid		},
	{	0x21,	2,	/* cistpl_funcid */	},
	{	0x22,	0,	/* cistpl_funce */	},
};

int sdio_read_cis(struct sdio_func *func)
{
	int ret;
	struct sdio_func_tuple *this, **prev;
	unsigned i, ptr = 0;

	for (i = 0; i < 3; i++) {
		unsigned char x;
		ret = mmc_io_rw_direct(func->card, 0, 0,
				func->num * 0x100 + SDIO_FBR_CIS + i, 0, &x);
		if (ret)
			return ret;
		ptr |= x << (i * 8);
	}

	/* find the list tail */
	for (prev = &func->tuples; *prev; prev = &(*prev)->next);

	do {
		unsigned char tpl_code, tpl_link;

		ret = mmc_io_rw_direct(func->card, 0, 0, ptr++, 0, &tpl_code);
		if (ret)
			break;

		/* 0xff means we're done */
		if (tpl_code == 0xff)
			break;

		ret = mmc_io_rw_direct(func->card, 0, 0, ptr++, 0, &tpl_link);
		if (ret)
			break;

		this = kmalloc(sizeof(*this) + tpl_link, GFP_KERNEL);
		if (!this)
			return -ENOMEM;

		for (i = 0; i < tpl_link; i++) {
			ret = mmc_io_rw_direct(func->card, 0, 0,
					       ptr + i, 0, &this->data[i]);
			if (ret)
				break;
		}
		if (ret) {
			kfree(this);
			break;
		}

		for (i = 0; i < ARRAY_SIZE(cis_tpl_list); i++)
			if (cis_tpl_list[i].code == tpl_code)
				break;
		if (i >= ARRAY_SIZE(cis_tpl_list)) {
			/* this tuple is unknown to the core */
			this->next = NULL;
			this->code = tpl_code;
			this->size = tpl_link;
			*prev = this;
			prev = &this->next;
			printk(KERN_DEBUG
			       "%s: queuing CIS tuple 0x%02x length %u\n",
			       sdio_func_id(func), tpl_code, tpl_link);
		} else {
			const struct cis_tpl *tpl = cis_tpl_list + i;
			if (tpl_link < tpl->min_size) {
				printk(KERN_ERR
				       "%s: bad CIS tuple 0x%02x (length = %u, expected >= %u)\n",
				       sdio_func_id(func), tpl_code, tpl_link, tpl->min_size);
				ret = -EINVAL;
			} else if (tpl->parse)
				ret = tpl->parse(func, this->data, tpl_link);
			kfree(this);
		}

		ptr += tpl_link;
	} while (!ret);

	return ret;
}

void sdio_free_cis(struct sdio_func *func)
{
	struct sdio_func_tuple *tuple, *victim;

	tuple = func->tuples;

	while (tuple) {
		victim = tuple;
		tuple = tuple->next;
		kfree(victim);
	}

	func->tuples = NULL;
}