drivers/mmc/core/sdio_cis.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * linux/drivers/mmc/core/sdio_cis.c
  *
  * Author:	Nicolas Pitre
  * Created:	June 11, 2007
  * Copyright:	MontaVista Software Inc.
  *
  * Copyright 2007 Pierre Ossman
  */

 #include <linux/kernel.h>
 #include <linux/slab.h>

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

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

 #define SDIO_READ_CIS_TIMEOUT_MS  (10 * 1000) /* 10s */

 static int cistpl_vers_1(struct mmc_card *card, struct sdio_func *func,
 			 const unsigned char *buf, unsigned size)
 {
 	u8 major_rev, minor_rev;
 	unsigned i, nr_strings;
 	char **buffer, *string;

 	if (size < 2)
 		return 0;

 	major_rev = buf[0];
 	minor_rev = buf[1];

 	/* Find all null-terminated (including zero length) strings in
 	   the TPLLV1_INFO field. Trailing garbage is ignored. */
 	buf += 2;
 	size -= 2;

 	nr_strings = 0;
 	for (i = 0; i < size; i++) {
 		if (buf[i] == 0xff)
 			break;
 		if (buf[i] == 0)
 			nr_strings++;
 	}
 	if (nr_strings == 0)
 		return 0;

 	size = i;

 	buffer = kzalloc(sizeof(char*) * nr_strings + size, GFP_KERNEL);
 	if (!buffer)
 		return -ENOMEM;

 	string = (char*)(buffer + nr_strings);

 	for (i = 0; i < nr_strings; i++) {
 		buffer[i] = string;
 		strcpy(string, buf);
 		string += strlen(string) + 1;
 		buf += strlen(buf) + 1;
 	}

 	if (func) {
 		func->major_rev = major_rev;
 		func->minor_rev = minor_rev;
 		func->num_info = nr_strings;
 		func->info = (const char**)buffer;
 	} else {
 		card->major_rev = major_rev;
 		card->minor_rev = minor_rev;
 		card->num_info = nr_strings;
 		card->info = (const char**)buffer;
 	}

 	return 0;
 }

 static int cistpl_manfid(struct mmc_card *card, struct sdio_func *func,
 			 const unsigned char *buf, unsigned size)
 {
 	unsigned int vendor, device;

 	/* TPLMID_MANF */
 	vendor = buf[0] | (buf[1] << 8);

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

 	if (func) {
 		func->vendor = vendor;
 		func->device = device;
 	} else {
 		card->cis.vendor = vendor;
 		card->cis.device = device;
 	}

 	return 0;
 }

 static const unsigned char speed_val[16] =
 	{ 0, 10, 12, 13, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80 };
 static const unsigned int speed_unit[8] =
 	{ 10000, 100000, 1000000, 10000000, 0, 0, 0, 0 };


 typedef int (tpl_parse_t)(struct mmc_card *, struct sdio_func *,
 			   const unsigned char *, unsigned);

 struct cis_tpl {
 	unsigned char code;
 	unsigned char min_size;
 	tpl_parse_t *parse;
 };

 static int cis_tpl_parse(struct mmc_card *card, struct sdio_func *func,
 			 const char *tpl_descr,
 			 const struct cis_tpl *tpl, int tpl_count,
 			 unsigned char code,
 			 const unsigned char *buf, unsigned size)
 {
 	int i, ret;

 	/* look for a matching code in the table */
 	for (i = 0; i < tpl_count; i++, tpl++) {
 		if (tpl->code == code)
 			break;
 	}
 	if (i < tpl_count) {
 		if (size >= tpl->min_size) {
 			if (tpl->parse)
 				ret = tpl->parse(card, func, buf, size);
 			else
 				ret = -EILSEQ;	/* known tuple, not parsed */
 		} else {
 			/* invalid tuple */
 			ret = -EINVAL;
 		}
 		if (ret && ret != -EILSEQ && ret != -ENOENT) {
 			pr_err("%s: bad %s tuple 0x%02x (%u bytes)\n",
 			       mmc_hostname(card->host), tpl_descr, code, size);
 		}
 	} else {
 		/* unknown tuple */
 		ret = -ENOENT;
 	}

 	return ret;
 }

 static int cistpl_funce_common(struct mmc_card *card, struct sdio_func *func,
 			       const unsigned char *buf, unsigned size)
 {
 	/* Only valid for the common CIS (function 0) */
 	if (func)
 		return -EINVAL;

 	/* TPLFE_FN0_BLK_SIZE */
 	card->cis.blksize = buf[1] | (buf[2] << 8);

 	/* TPLFE_MAX_TRAN_SPEED */
 	card->cis.max_dtr = speed_val[(buf[3] >> 3) & 15] *
 			    speed_unit[buf[3] & 7];

 	return 0;
 }

 static int cistpl_funce_func(struct mmc_card *card, struct sdio_func *func,
 			     const unsigned char *buf, unsigned size)
 {
 	unsigned vsn;
 	unsigned min_size;

 	/* Only valid for the individual function's CIS (1-7) */
 	if (!func)
 		return -EINVAL;

 	/*
 	 * This tuple has a different length depending on the SDIO spec
 	 * version.
 	 */
 	vsn = func->card->cccr.sdio_vsn;
 	min_size = (vsn == SDIO_SDIO_REV_1_00) ? 28 : 42;

 	if (size == 28 && vsn == SDIO_SDIO_REV_1_10) {
 		pr_warn("%s: card has broken SDIO 1.1 CIS, forcing SDIO 1.0\n",
 			mmc_hostname(card->host));
 		vsn = SDIO_SDIO_REV_1_00;
 	} else if (size < min_size) {
 		return -EINVAL;
 	}

 	/* TPLFE_MAX_BLK_SIZE */
 	func->max_blksize = buf[12] | (buf[13] << 8);

 	/* TPLFE_ENABLE_TIMEOUT_VAL, present in ver 1.1 and above */
 	if (vsn > SDIO_SDIO_REV_1_00)
 		func->enable_timeout = (buf[28] | (buf[29] << 8)) * 10;
 	else
 		func->enable_timeout = jiffies_to_msecs(HZ);

 	return 0;
 }

 /*
  * Known TPLFE_TYPEs table for CISTPL_FUNCE tuples.
  *
  * Note that, unlike PCMCIA, CISTPL_FUNCE tuples are not parsed depending
  * on the TPLFID_FUNCTION value of the previous CISTPL_FUNCID as on SDIO
  * TPLFID_FUNCTION is always hardcoded to 0x0C.
  */
 static const struct cis_tpl cis_tpl_funce_list[] = {
 	{	0x00,	4,	cistpl_funce_common		},
 	{	0x01,	0,	cistpl_funce_func		},
 	{	0x04,	1+1+6,	/* CISTPL_FUNCE_LAN_NODE_ID */	},
 };

 static int cistpl_funce(struct mmc_card *card, struct sdio_func *func,
 			const unsigned char *buf, unsigned size)
 {
 	if (size < 1)
 		return -EINVAL;

 	return cis_tpl_parse(card, func, "CISTPL_FUNCE",
 			     cis_tpl_funce_list,
 			     ARRAY_SIZE(cis_tpl_funce_list),
 			     buf[0], buf, size);
 }

 /* Known TPL_CODEs table for CIS tuples */
 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		},
 	{	0x91,	2,	/* cistpl_sdio_std */	},
 };

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

 	/*
 	 * Note that this works for the common CIS (function number 0) as
 	 * well as a function's CIS * since SDIO_CCCR_CIS and SDIO_FBR_CIS
 	 * have the same offset.
 	 */
 	for (i = 0; i < 3; i++) {
 		unsigned char x, fn;

 		if (func)
 			fn = func->num;
 		else
 			fn = 0;

 		ret = mmc_io_rw_direct(card, 0, 0,
 			SDIO_FBR_BASE(fn) + SDIO_FBR_CIS + i, 0, &x);
 		if (ret)
 			return ret;
 		ptr |= x << (i * 8);
 	}

 	if (func)
 		prev = &func->tuples;
 	else
 		prev = &card->tuples;

 	if (*prev)
 		return -EINVAL;

 	do {
 		unsigned char tpl_code, tpl_link;
 		unsigned long timeout = jiffies +
 			msecs_to_jiffies(SDIO_READ_CIS_TIMEOUT_MS);

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

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

 		/* null entries have no link field or data */
 		if (tpl_code == 0x00)
 			continue;

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

 		/* a size of 0xff also means we're done */
 		if (tpl_link == 0xff)
 			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(card, 0, 0,
 					       ptr + i, 0, &this->data[i]);
 			if (ret)
 				break;
 		}
 		if (ret) {
 			kfree(this);
 			break;
 		}

 		/* Try to parse the CIS tuple */
 		ret = cis_tpl_parse(card, func, "CIS",
 				    cis_tpl_list, ARRAY_SIZE(cis_tpl_list),
 				    tpl_code, this->data, tpl_link);
 		if (ret == -EILSEQ || ret == -ENOENT) {
 			/*
 			 * The tuple is unknown or known but not parsed.
 			 * Queue the tuple for the function driver.
 			 */
 			this->next = NULL;
 			this->code = tpl_code;
 			this->size = tpl_link;
 			*prev = this;
 			prev = &this->next;

 			if (ret == -ENOENT) {

 				if (time_after(jiffies, timeout))
 					break;

 #define FMT(type) "%s: queuing " type " CIS tuple 0x%02x [%*ph] (%u bytes)\n"
 				/*
 				 * Tuples in this range are reserved for
 				 * vendors, so don't warn about them
 				 */
 				if (tpl_code >= 0x80 && tpl_code <= 0x8f)
 					pr_debug_ratelimited(FMT("vendor"),
 						mmc_hostname(card->host),
 						tpl_code, tpl_link, this->data,
 						tpl_link);
 				else
 					pr_warn_ratelimited(FMT("unknown"),
 						mmc_hostname(card->host),
 						tpl_code, tpl_link, this->data,
 						tpl_link);
 			}

 			/* keep on analyzing tuples */
 			ret = 0;
 		} else {
 			/*
 			 * We don't need the tuple anymore if it was
 			 * successfully parsed by the SDIO core or if it is
 			 * not going to be queued for a driver.
 			 */
 			kfree(this);
 		}

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

 	/*
 	 * Link in all unknown tuples found in the common CIS so that
 	 * drivers don't have to go digging in two places.
 	 */
 	if (func)
 		*prev = card->tuples;

 	return ret;
 }

 int sdio_read_common_cis(struct mmc_card *card)
 {
 	return sdio_read_cis(card, NULL);
 }

 void sdio_free_common_cis(struct mmc_card *card)
 {
 	struct sdio_func_tuple *tuple, *victim;

 	tuple = card->tuples;

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

 	card->tuples = NULL;
 }

 int sdio_read_func_cis(struct sdio_func *func)
 {
 	int ret;

 	ret = sdio_read_cis(func->card, func);
 	if (ret)
 		return ret;

 	/*
 	 * Since we've linked to tuples in the card structure,
 	 * we must make sure we have a reference to it.
 	 */
 	get_device(&func->card->dev);

 	/*
 	 * Vendor/device id is optional for function CIS, so
 	 * copy it from the card structure as needed.
 	 */
 	if (func->vendor == 0) {
 		func->vendor = func->card->cis.vendor;
 		func->device = func->card->cis.device;
 	}

 	return 0;
 }

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

 	tuple = func->tuples;

 	while (tuple && tuple != func->card->tuples) {
 		victim = tuple;
 		tuple = tuple->next;
 		kfree(victim);
 	}

 	func->tuples = NULL;

 	/*
 	 * We have now removed the link to the tuples in the
 	 * card structure, so remove the reference.
 	 */
 	put_device(&func->card->dev);
 }
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* linux/drivers/mmc/core/sdio_cis.c
	*
	* Author: Nicolas Pitre
	* Created: June 11, 2007
	* Copyright: MontaVista Software Inc.
	*
	* Copyright 2007 Pierre Ossman
	*/

	#include <linux/kernel.h>
	#include <linux/slab.h>

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

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

	#define SDIO_READ_CIS_TIMEOUT_MS (10 * 1000) /* 10s */

	static int cistpl_vers_1(struct mmc_card card, struct sdio_func func,
	const unsigned char *buf, unsigned size)
	{
	u8 major_rev, minor_rev;
	unsigned i, nr_strings;
	char *buffer, string;

	if (size < 2)
	return 0;

	major_rev = buf[0];
	minor_rev = buf[1];

	/* Find all null-terminated (including zero length) strings in
	the TPLLV1_INFO field. Trailing garbage is ignored. */
	buf += 2;
	size -= 2;

	nr_strings = 0;
	for (i = 0; i < size; i++) {
	if (buf[i] == 0xff)
	break;
	if (buf[i] == 0)
	nr_strings++;
	}
	if (nr_strings == 0)
	return 0;

	size = i;

	buffer = kzalloc(sizeof(char) nr_strings + size, GFP_KERNEL);
	if (!buffer)
	return -ENOMEM;

	string = (char*)(buffer + nr_strings);

	for (i = 0; i < nr_strings; i++) {
	buffer[i] = string;
	strcpy(string, buf);
	string += strlen(string) + 1;
	buf += strlen(buf) + 1;
	}

	if (func) {
	func->major_rev = major_rev;
	func->minor_rev = minor_rev;
	func->num_info = nr_strings;
	func->info = (const char**)buffer;
	} else {
	card->major_rev = major_rev;
	card->minor_rev = minor_rev;
	card->num_info = nr_strings;
	card->info = (const char**)buffer;
	}

	return 0;
	}

	static int cistpl_manfid(struct mmc_card card, struct sdio_func func,
	const unsigned char *buf, unsigned size)
	{
	unsigned int vendor, device;

	/* TPLMID_MANF */
	vendor = buf[0] \| (buf[1] << 8);

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

	if (func) {
	func->vendor = vendor;
	func->device = device;
	} else {
	card->cis.vendor = vendor;
	card->cis.device = device;
	}

	return 0;
	}

	static const unsigned char speed_val[16] =
	{ 0, 10, 12, 13, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80 };
	static const unsigned int speed_unit[8] =
	{ 10000, 100000, 1000000, 10000000, 0, 0, 0, 0 };


	typedef int (tpl_parse_t)(struct mmc_card , struct sdio_func ,
	const unsigned char *, unsigned);

	struct cis_tpl {
	unsigned char code;
	unsigned char min_size;
	tpl_parse_t *parse;
	};

	static int cis_tpl_parse(struct mmc_card card, struct sdio_func func,
	const char *tpl_descr,
	const struct cis_tpl *tpl, int tpl_count,
	unsigned char code,
	const unsigned char *buf, unsigned size)
	{
	int i, ret;

	/* look for a matching code in the table */
	for (i = 0; i < tpl_count; i++, tpl++) {
	if (tpl->code == code)
	break;
	}
	if (i < tpl_count) {
	if (size >= tpl->min_size) {
	if (tpl->parse)
	ret = tpl->parse(card, func, buf, size);
	else
	ret = -EILSEQ; /* known tuple, not parsed */
	} else {
	/* invalid tuple */
	ret = -EINVAL;
	}
	if (ret && ret != -EILSEQ && ret != -ENOENT) {
	pr_err("%s: bad %s tuple 0x%02x (%u bytes)\n",
	mmc_hostname(card->host), tpl_descr, code, size);
	}
	} else {
	/* unknown tuple */
	ret = -ENOENT;
	}

	return ret;
	}

	static int cistpl_funce_common(struct mmc_card card, struct sdio_func func,
	const unsigned char *buf, unsigned size)
	{
	/* Only valid for the common CIS (function 0) */
	if (func)
	return -EINVAL;

	/* TPLFE_FN0_BLK_SIZE */
	card->cis.blksize = buf[1] \| (buf[2] << 8);

	/* TPLFE_MAX_TRAN_SPEED */
	card->cis.max_dtr = speed_val[(buf[3] >> 3) & 15] *
	speed_unit[buf[3] & 7];

	return 0;
	}

	static int cistpl_funce_func(struct mmc_card card, struct sdio_func func,
	const unsigned char *buf, unsigned size)
	{
	unsigned vsn;
	unsigned min_size;

	/* Only valid for the individual function's CIS (1-7) */
	if (!func)
	return -EINVAL;

	/*
	* This tuple has a different length depending on the SDIO spec
	* version.
	*/
	vsn = func->card->cccr.sdio_vsn;
	min_size = (vsn == SDIO_SDIO_REV_1_00) ? 28 : 42;

	if (size == 28 && vsn == SDIO_SDIO_REV_1_10) {
	pr_warn("%s: card has broken SDIO 1.1 CIS, forcing SDIO 1.0\n",
	mmc_hostname(card->host));
	vsn = SDIO_SDIO_REV_1_00;
	} else if (size < min_size) {
	return -EINVAL;
	}

	/* TPLFE_MAX_BLK_SIZE */
	func->max_blksize = buf[12] \| (buf[13] << 8);

	/* TPLFE_ENABLE_TIMEOUT_VAL, present in ver 1.1 and above */
	if (vsn > SDIO_SDIO_REV_1_00)
	func->enable_timeout = (buf[28] \| (buf[29] << 8)) * 10;
	else
	func->enable_timeout = jiffies_to_msecs(HZ);

	return 0;
	}

	/*
	* Known TPLFE_TYPEs table for CISTPL_FUNCE tuples.
	*
	* Note that, unlike PCMCIA, CISTPL_FUNCE tuples are not parsed depending
	* on the TPLFID_FUNCTION value of the previous CISTPL_FUNCID as on SDIO
	* TPLFID_FUNCTION is always hardcoded to 0x0C.
	*/
	static const struct cis_tpl cis_tpl_funce_list[] = {
	{ 0x00, 4, cistpl_funce_common },
	{ 0x01, 0, cistpl_funce_func },
	{ 0x04, 1+1+6, /* CISTPL_FUNCE_LAN_NODE_ID */ },
	};

	static int cistpl_funce(struct mmc_card card, struct sdio_func func,
	const unsigned char *buf, unsigned size)
	{
	if (size < 1)
	return -EINVAL;

	return cis_tpl_parse(card, func, "CISTPL_FUNCE",
	cis_tpl_funce_list,
	ARRAY_SIZE(cis_tpl_funce_list),
	buf[0], buf, size);
	}

	/* Known TPL_CODEs table for CIS tuples */
	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 },
	{ 0x91, 2, /* cistpl_sdio_std */ },
	};

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

	/*
	* Note that this works for the common CIS (function number 0) as
	* well as a function's CIS * since SDIO_CCCR_CIS and SDIO_FBR_CIS
	* have the same offset.
	*/
	for (i = 0; i < 3; i++) {
	unsigned char x, fn;

	if (func)
	fn = func->num;
	else
	fn = 0;

	ret = mmc_io_rw_direct(card, 0, 0,
	SDIO_FBR_BASE(fn) + SDIO_FBR_CIS + i, 0, &x);
	if (ret)
	return ret;
	ptr \|= x << (i * 8);
	}

	if (func)
	prev = &func->tuples;
	else
	prev = &card->tuples;

	if (*prev)
	return -EINVAL;

	do {
	unsigned char tpl_code, tpl_link;
	unsigned long timeout = jiffies +
	msecs_to_jiffies(SDIO_READ_CIS_TIMEOUT_MS);

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

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

	/* null entries have no link field or data */
	if (tpl_code == 0x00)
	continue;

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

	/* a size of 0xff also means we're done */
	if (tpl_link == 0xff)
	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(card, 0, 0,
	ptr + i, 0, &this->data[i]);
	if (ret)
	break;
	}
	if (ret) {
	kfree(this);
	break;
	}

	/* Try to parse the CIS tuple */
	ret = cis_tpl_parse(card, func, "CIS",
	cis_tpl_list, ARRAY_SIZE(cis_tpl_list),
	tpl_code, this->data, tpl_link);
	if (ret == -EILSEQ \|\| ret == -ENOENT) {
	/*
	* The tuple is unknown or known but not parsed.
	* Queue the tuple for the function driver.
	*/
	this->next = NULL;
	this->code = tpl_code;
	this->size = tpl_link;
	*prev = this;
	prev = &this->next;

	if (ret == -ENOENT) {

	if (time_after(jiffies, timeout))
	break;

	#define FMT(type) "%s: queuing " type " CIS tuple 0x%02x [%*ph] (%u bytes)\n"
	/*
	* Tuples in this range are reserved for
	* vendors, so don't warn about them
	*/
	if (tpl_code >= 0x80 && tpl_code <= 0x8f)
	pr_debug_ratelimited(FMT("vendor"),
	mmc_hostname(card->host),
	tpl_code, tpl_link, this->data,
	tpl_link);
	else
	pr_warn_ratelimited(FMT("unknown"),
	mmc_hostname(card->host),
	tpl_code, tpl_link, this->data,
	tpl_link);
	}

	/* keep on analyzing tuples */
	ret = 0;
	} else {
	/*
	* We don't need the tuple anymore if it was
	* successfully parsed by the SDIO core or if it is
	* not going to be queued for a driver.
	*/
	kfree(this);
	}

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

	/*
	* Link in all unknown tuples found in the common CIS so that
	* drivers don't have to go digging in two places.
	*/
	if (func)
	*prev = card->tuples;

	return ret;
	}

	int sdio_read_common_cis(struct mmc_card *card)
	{
	return sdio_read_cis(card, NULL);
	}

	void sdio_free_common_cis(struct mmc_card *card)
	{
	struct sdio_func_tuple tuple, victim;

	tuple = card->tuples;

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

	card->tuples = NULL;
	}

	int sdio_read_func_cis(struct sdio_func *func)
	{
	int ret;

	ret = sdio_read_cis(func->card, func);
	if (ret)
	return ret;

	/*
	* Since we've linked to tuples in the card structure,
	* we must make sure we have a reference to it.
	*/
	get_device(&func->card->dev);

	/*
	* Vendor/device id is optional for function CIS, so
	* copy it from the card structure as needed.
	*/
	if (func->vendor == 0) {
	func->vendor = func->card->cis.vendor;
	func->device = func->card->cis.device;
	}

	return 0;
	}

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

	tuple = func->tuples;

	while (tuple && tuple != func->card->tuples) {
	victim = tuple;
	tuple = tuple->next;
	kfree(victim);
	}

	func->tuples = NULL;

	/*
	* We have now removed the link to the tuples in the
	* card structure, so remove the reference.
	*/
	put_device(&func->card->dev);
	}