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Commit 4ec64960 authored by Albert Herranz's avatar Albert Herranz Committed by Linus Torvalds
Browse files

sdio: rework cis tuple parsing 



Rework the current CIS tuple parsing code, reusing the existing
infrastructure and providing an easy way to add new CISTPL_FUNCE parsers
by TPLFE_TYPE.

Valid known CIS tuples are now silently queued for the SDIO function
driver when not parsed/processed (-EILSEQ) by the SDIO core.  Unknown CIS
tuples (-ENOENT) are queued too for the SDIO function driver without
aborting the initialization, but emit a warning in the kernel log.

CISTPL_FUNCE tuples can be "whitelisted" now by adding a matching entry to
the cis_tpl_funce_list table.

Signed-off-by: default avatarAlbert Herranz <albert_herranz@yahoo.es>
Acked-by: default avatarPierre Ossman <pierre@ossman.eu>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent c0521baf

drivers/mmc/core/sdio_cis.c

+93 −74
Original line number Diff line number Diff line
@@ -97,26 +97,56 @@ static const unsigned char speed_val[16] = 
static const unsigned int speed_unit[8] =

	{ 10000, 100000, 1000000, 10000000, 0, 0, 0, 0 };



/* FUNCE tuples with these types get passed to SDIO drivers */

static const unsigned char funce_type_whitelist[] = {

	4 /* CISTPL_FUNCE_LAN_NODE_ID used in Broadcom cards */



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 cistpl_funce_whitelisted(unsigned char type)

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;

	int i, ret;



	for (i = 0; i < ARRAY_SIZE(funce_type_whitelist); i++) {

		if (funce_type_whitelist[i] == type)

			return 1;

	/* look for a matching code in the table */

	for (i = 0; i < tpl_count; i++, tpl++) {

		if (tpl->code == code)

			break;

	}

	return 0;

	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) {

			printk(KERN_ERR "%s: bad %s tuple 0x%02x (%u bytes)\n",

			       mmc_hostname(card->host), tpl_descr, code, size);

		}

	} else {

		/* unknown tuple */

		ret = -ENOENT;

	}



static int cistpl_funce_common(struct mmc_card *card,

	return ret;

}



static int cistpl_funce_common(struct mmc_card *card, struct sdio_func *func,

			       const unsigned char *buf, unsigned size)

{

	if (size < 0x04 || buf[0] != 0)

	/* Only valid for the common CIS (function 0) */

	if (func)

		return -EINVAL;



	/* TPLFE_FN0_BLK_SIZE */
@@ -129,20 +159,24 @@ static int cistpl_funce_common(struct mmc_card *card, 
	return 0;

}



static int cistpl_funce_func(struct sdio_func *func,

static int cistpl_funce_func(struct mmc_card *card, struct sdio_func *func,

			     const unsigned char *buf, unsigned size)

{

	unsigned vsn;

	unsigned min_size;



	/* let SDIO drivers take care of whitelisted FUNCE tuples */

	if (cistpl_funce_whitelisted(buf[0]))

		return -EILSEQ;

	/* 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 < min_size || buf[0] != 1)

	if (size < min_size)

		return -EINVAL;



	/* TPLFE_MAX_BLK_SIZE */
@@ -157,39 +191,32 @@ static int cistpl_funce_func(struct sdio_func *func, 
	return 0;

}



static int cistpl_funce(struct mmc_card *card, struct sdio_func *func,

			const unsigned char *buf, unsigned size)

{

	int ret;



/*

	 * There should be two versions of the CISTPL_FUNCE tuple,

	 * one for the common CIS (function 0) and a version used by

	 * the individual function's CIS (1-7). Yet, the later has a

	 * different length depending on the SDIO spec version.

 * 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.

 */

	if (func)

		ret = cistpl_funce_func(func, buf, size);

	else

		ret = cistpl_funce_common(card, buf, size);

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 */	},

};



	if (ret && ret != -EILSEQ) {

		printk(KERN_ERR "%s: bad CISTPL_FUNCE size %u "

		       "type %u\n", mmc_hostname(card->host), size, buf[0]);

	}

static int cistpl_funce(struct mmc_card *card, struct sdio_func *func,

			const unsigned char *buf, unsigned size)

{

	if (size < 1)

		return -EINVAL;



	return ret;

	return cis_tpl_parse(card, func, "CISTPL_FUNCE",

			     cis_tpl_funce_list,

			     ARRAY_SIZE(cis_tpl_funce_list),

			     buf[0], buf, size);

}



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;

};



/* Known TPL_CODEs table for CIS tuples */

static const struct cis_tpl cis_tpl_list[] = {

	{	0x15,	3,	cistpl_vers_1		},

	{	0x20,	4,	cistpl_manfid		},
@@ -268,46 +295,38 @@ static int sdio_read_cis(struct mmc_card *card, struct sdio_func *func) 
			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)) {

			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",

				       mmc_hostname(card->host),

				       tpl_code, tpl_link, tpl->min_size);

				ret = -EINVAL;

			} else if (tpl->parse) {

				ret = tpl->parse(card, func,

						 this->data, tpl_link);

			}

		/* 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) {

			/*

			 * We don't need the tuple anymore if it was

			 * successfully parsed by the SDIO core or if it is

			 * not going to be parsed by SDIO drivers.

			 * The tuple is unknown or known but not parsed.

			 * Queue the tuple for the function driver.

			 */

			if (!ret || ret != -EILSEQ)

				kfree(this);

		} else {

			/* unknown tuple */

			ret = -EILSEQ;

		}



		if (ret == -EILSEQ) {

			/* this tuple is unknown to the core or whitelisted */

			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",

			       mmc_hostname(card->host), tpl_code, tpl_link);



			if (ret == -ENOENT) {

				/* warn about unknown tuples */

				printk(KERN_WARNING "%s: queuing unknown"

				       " CIS tuple 0x%02x (%u bytes)\n",

				       mmc_hostname(card->host),

				       tpl_code, 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;