Commit 08837438 authored by Rajiv Andrade's avatar Rajiv Andrade Committed by James Morris
Browse files

TPM: sysfs functions consolidation 



According to Dave Hansen's comments on the tpm_show_*, some of these functions
present a pattern when allocating data[] memory space and also when setting its
content. A new function was created so that this pattern could be consolidated.
Also, replaced the data[] command vectors and its indexes by meaningful structures
as pointed out by Matt Helsley too.

Signed-off-by: default avatarRajiv Andrade <srajiv@linux.vnet.ibm.com>
Signed-off-by: default avatarJames Morris <jmorris@namei.org>
parent faa3aad7

drivers/char/tpm/tpm.c

+142 −269
Original line number Diff line number Diff line
@@ -429,134 +429,148 @@ out: 
#define TPM_DIGEST_SIZE 20

#define TPM_ERROR_SIZE 10

#define TPM_RET_CODE_IDX 6

#define TPM_GET_CAP_RET_SIZE_IDX 10

#define TPM_GET_CAP_RET_UINT32_1_IDX 14

#define TPM_GET_CAP_RET_UINT32_2_IDX 18

#define TPM_GET_CAP_RET_UINT32_3_IDX 22

#define TPM_GET_CAP_RET_UINT32_4_IDX 26

#define TPM_GET_CAP_PERM_DISABLE_IDX 16

#define TPM_GET_CAP_PERM_INACTIVE_IDX 18

#define TPM_GET_CAP_RET_BOOL_1_IDX 14

#define TPM_GET_CAP_TEMP_INACTIVE_IDX 16



#define TPM_CAP_IDX 13

#define TPM_CAP_SUBCAP_IDX 21



enum tpm_capabilities {

	TPM_CAP_FLAG = 4,

	TPM_CAP_PROP = 5,

	TPM_CAP_FLAG = cpu_to_be32(4),

	TPM_CAP_PROP = cpu_to_be32(5),

	CAP_VERSION_1_1 = cpu_to_be32(0x06),

	CAP_VERSION_1_2 = cpu_to_be32(0x1A)

};



enum tpm_sub_capabilities {

	TPM_CAP_PROP_PCR = 0x1,

	TPM_CAP_PROP_MANUFACTURER = 0x3,

	TPM_CAP_FLAG_PERM = 0x8,

	TPM_CAP_FLAG_VOL = 0x9,

	TPM_CAP_PROP_OWNER = 0x11,

	TPM_CAP_PROP_TIS_TIMEOUT = 0x15,

	TPM_CAP_PROP_TIS_DURATION = 0x20,

};

	TPM_CAP_PROP_PCR = cpu_to_be32(0x101),

	TPM_CAP_PROP_MANUFACTURER = cpu_to_be32(0x103),

	TPM_CAP_FLAG_PERM = cpu_to_be32(0x108),

	TPM_CAP_FLAG_VOL = cpu_to_be32(0x109),

	TPM_CAP_PROP_OWNER = cpu_to_be32(0x111),

	TPM_CAP_PROP_TIS_TIMEOUT = cpu_to_be32(0x115),

	TPM_CAP_PROP_TIS_DURATION = cpu_to_be32(0x120),



/*

 * This is a semi generic GetCapability command for use

 * with the capability type TPM_CAP_PROP or TPM_CAP_FLAG

 * and their associated sub_capabilities.

 */



static const u8 tpm_cap[] = {

	0, 193,			/* TPM_TAG_RQU_COMMAND */

	0, 0, 0, 22,		/* length */

	0, 0, 0, 101,		/* TPM_ORD_GetCapability */

	0, 0, 0, 0,		/* TPM_CAP_<TYPE> */

	0, 0, 0, 4,		/* TPM_CAP_SUB_<TYPE> size */

	0, 0, 1, 0		/* TPM_CAP_SUB_<TYPE> */

};



static ssize_t transmit_cmd(struct tpm_chip *chip, u8 *data, int len,

			    char *desc)

static ssize_t transmit_cmd(struct tpm_chip *chip, struct tpm_cmd_t *cmd,

			    int len, const char *desc)

{

	int err;



	len = tpm_transmit(chip, data, len);

	len = tpm_transmit(chip,(u8 *) cmd, len);

	if (len <  0)

		return len;

	if (len == TPM_ERROR_SIZE) {

		err = be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX)));

		err = be32_to_cpu(cmd->header.out.return_code);

		dev_dbg(chip->dev, "A TPM error (%d) occurred %s\n", err, desc);

		return err;

	}

	return 0;

}



#define TPM_INTERNAL_RESULT_SIZE 200

#define TPM_TAG_RQU_COMMAND cpu_to_be16(193)

#define TPM_ORD_GET_CAP cpu_to_be32(101)



static const struct tpm_input_header tpm_getcap_header = {

	.tag = TPM_TAG_RQU_COMMAND,

	.length = cpu_to_be32(22),

	.ordinal = TPM_ORD_GET_CAP

};



ssize_t tpm_getcap(struct device *dev, __be32 subcap_id, cap_t *cap,

		   const char *desc)

{

	struct tpm_cmd_t tpm_cmd;

	int rc;

	struct tpm_chip *chip = dev_get_drvdata(dev);



	tpm_cmd.header.in = tpm_getcap_header;

	if (subcap_id == CAP_VERSION_1_1 || subcap_id == CAP_VERSION_1_2) {

		tpm_cmd.params.getcap_in.cap = subcap_id;

		/*subcap field not necessary */

		tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(0);

		tpm_cmd.header.in.length -= cpu_to_be32(sizeof(__be32));

	} else {

		if (subcap_id == TPM_CAP_FLAG_PERM ||

		    subcap_id == TPM_CAP_FLAG_VOL)

			tpm_cmd.params.getcap_in.cap = TPM_CAP_FLAG;

		else

			tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;

		tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);

		tpm_cmd.params.getcap_in.subcap = subcap_id;

	}

	rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, desc);

	if (!rc)

		*cap = tpm_cmd.params.getcap_out.cap;

	return rc;

}



void tpm_gen_interrupt(struct tpm_chip *chip)

{

	u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 30)];

	struct	tpm_cmd_t tpm_cmd;

	ssize_t rc;



	memcpy(data, tpm_cap, sizeof(tpm_cap));

	data[TPM_CAP_IDX] = TPM_CAP_PROP;

	data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_TIS_TIMEOUT;

	tpm_cmd.header.in = tpm_getcap_header;

	tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;

	tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);

	tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;



	rc = transmit_cmd(chip, data, sizeof(data),

	rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,

			"attempting to determine the timeouts");

}

EXPORT_SYMBOL_GPL(tpm_gen_interrupt);



void tpm_get_timeouts(struct tpm_chip *chip)

{

	u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 30)];

	struct tpm_cmd_t tpm_cmd;

	struct timeout_t *timeout_cap;

	struct duration_t *duration_cap;

	ssize_t rc;

	u32 timeout;



	memcpy(data, tpm_cap, sizeof(tpm_cap));

	data[TPM_CAP_IDX] = TPM_CAP_PROP;

	data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_TIS_TIMEOUT;

	tpm_cmd.header.in = tpm_getcap_header;

	tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;

	tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);

	tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;



	rc = transmit_cmd(chip, data, sizeof(data),

	rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,

			"attempting to determine the timeouts");

	if (rc)

		goto duration;



	if (be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_SIZE_IDX)))

	if (be32_to_cpu(tpm_cmd.header.out.length)

	    != 4 * sizeof(u32))

		goto duration;



	timeout_cap = &tpm_cmd.params.getcap_out.cap.timeout;

	/* Don't overwrite default if value is 0 */

	timeout =

	    be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX)));

	timeout = be32_to_cpu(timeout_cap->a);

	if (timeout)

		chip->vendor.timeout_a = usecs_to_jiffies(timeout);

	timeout =

	    be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_2_IDX)));

	timeout = be32_to_cpu(timeout_cap->b);

	if (timeout)

		chip->vendor.timeout_b = usecs_to_jiffies(timeout);

	timeout =

	    be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_3_IDX)));

	timeout = be32_to_cpu(timeout_cap->c);

	if (timeout)

		chip->vendor.timeout_c = usecs_to_jiffies(timeout);

	timeout =

	    be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_4_IDX)));

	timeout = be32_to_cpu(timeout_cap->d);

	if (timeout)

		chip->vendor.timeout_d = usecs_to_jiffies(timeout);



duration:

	memcpy(data, tpm_cap, sizeof(tpm_cap));

	data[TPM_CAP_IDX] = TPM_CAP_PROP;

	data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_TIS_DURATION;

	tpm_cmd.header.in = tpm_getcap_header;

	tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;

	tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);

	tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_DURATION;



	rc = transmit_cmd(chip, data, sizeof(data),

	rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,

			"attempting to determine the durations");

	if (rc)

		return;



	if (be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_SIZE_IDX)))

	if (be32_to_cpu(tpm_cmd.header.out.return_code)

	    != 3 * sizeof(u32))

		return;



	duration_cap = &tpm_cmd.params.getcap_out.cap.duration;

	chip->vendor.duration[TPM_SHORT] =

	    usecs_to_jiffies(be32_to_cpu

			     (*((__be32 *) (data +

					    TPM_GET_CAP_RET_UINT32_1_IDX))));

	    usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_short));

	/* The Broadcom BCM0102 chipset in a Dell Latitude D820 gets the above

	 * value wrong and apparently reports msecs rather than usecs. So we

	 * fix up the resulting too-small TPM_SHORT value to make things work.
@@ -565,13 +579,9 @@ duration: 
		chip->vendor.duration[TPM_SHORT] = HZ;



	chip->vendor.duration[TPM_MEDIUM] =

	    usecs_to_jiffies(be32_to_cpu

			     (*((__be32 *) (data +

					    TPM_GET_CAP_RET_UINT32_2_IDX))));

	    usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_medium));

	chip->vendor.duration[TPM_LONG] =

	    usecs_to_jiffies(be32_to_cpu

			     (*((__be32 *) (data +

					    TPM_GET_CAP_RET_UINT32_3_IDX))));

	    usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_long));

}

EXPORT_SYMBOL_GPL(tpm_get_timeouts);
@@ -587,36 +597,18 @@ void tpm_continue_selftest(struct tpm_chip *chip) 
}

EXPORT_SYMBOL_GPL(tpm_continue_selftest);



#define  TPM_INTERNAL_RESULT_SIZE 200



ssize_t tpm_show_enabled(struct device * dev, struct device_attribute * attr,

			char *buf)

{

	u8 *data;

	cap_t cap;

	ssize_t rc;



	struct tpm_chip *chip = dev_get_drvdata(dev);

	if (chip == NULL)

		return -ENODEV;



	data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);

	if (!data)

		return -ENOMEM;



	memcpy(data, tpm_cap, sizeof(tpm_cap));

	data[TPM_CAP_IDX] = TPM_CAP_FLAG;

	data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_PERM;



	rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,

			"attemtping to determine the permanent enabled state");

	if (rc) {

		kfree(data);

	rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,

			 "attempting to determine the permanent enabled state");

	if (rc)

		return 0;

	}



	rc = sprintf(buf, "%d\n", !data[TPM_GET_CAP_PERM_DISABLE_IDX]);



	kfree(data);

	rc = sprintf(buf, "%d\n", !cap.perm_flags.disable);

	return rc;

}

EXPORT_SYMBOL_GPL(tpm_show_enabled);
@@ -624,31 +616,15 @@ EXPORT_SYMBOL_GPL(tpm_show_enabled); 
ssize_t tpm_show_active(struct device * dev, struct device_attribute * attr,

			char *buf)

{

	u8 *data;

	cap_t cap;

	ssize_t rc;



	struct tpm_chip *chip = dev_get_drvdata(dev);

	if (chip == NULL)

		return -ENODEV;



	data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);

	if (!data)

		return -ENOMEM;



	memcpy(data, tpm_cap, sizeof(tpm_cap));

	data[TPM_CAP_IDX] = TPM_CAP_FLAG;

	data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_PERM;



	rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,

			"attemtping to determine the permanent active state");

	if (rc) {

		kfree(data);

	rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,

			 "attempting to determine the permanent active state");

	if (rc)

		return 0;

	}



	rc = sprintf(buf, "%d\n", !data[TPM_GET_CAP_PERM_INACTIVE_IDX]);



	kfree(data);

	rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated);

	return rc;

}

EXPORT_SYMBOL_GPL(tpm_show_active);
@@ -656,31 +632,15 @@ EXPORT_SYMBOL_GPL(tpm_show_active); 
ssize_t tpm_show_owned(struct device * dev, struct device_attribute * attr,

			char *buf)

{

	u8 *data;

	cap_t cap;

	ssize_t rc;



	struct tpm_chip *chip = dev_get_drvdata(dev);

	if (chip == NULL)

		return -ENODEV;



	data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);

	if (!data)

		return -ENOMEM;



	memcpy(data, tpm_cap, sizeof(tpm_cap));

	data[TPM_CAP_IDX] = TPM_CAP_PROP;

	data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_OWNER;



	rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,

	rc = tpm_getcap(dev, TPM_CAP_PROP_OWNER, &cap,

			 "attempting to determine the owner state");

	if (rc) {

		kfree(data);

	if (rc)

		return 0;

	}



	rc = sprintf(buf, "%d\n", data[TPM_GET_CAP_RET_BOOL_1_IDX]);



	kfree(data);

	rc = sprintf(buf, "%d\n", cap.owned);

	return rc;

}

EXPORT_SYMBOL_GPL(tpm_show_owned);
@@ -688,31 +648,15 @@ EXPORT_SYMBOL_GPL(tpm_show_owned); 
ssize_t tpm_show_temp_deactivated(struct device * dev,

				struct device_attribute * attr, char *buf)

{

	u8 *data;

	cap_t cap;

	ssize_t rc;



	struct tpm_chip *chip = dev_get_drvdata(dev);

	if (chip == NULL)

		return -ENODEV;



	data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);

	if (!data)

		return -ENOMEM;



	memcpy(data, tpm_cap, sizeof(tpm_cap));

	data[TPM_CAP_IDX] = TPM_CAP_FLAG;

	data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_VOL;



	rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,

	rc = tpm_getcap(dev, TPM_CAP_FLAG_VOL, &cap,

			 "attempting to determine the temporary state");

	if (rc) {

		kfree(data);

	if (rc)

		return 0;

	}



	rc = sprintf(buf, "%d\n", data[TPM_GET_CAP_TEMP_INACTIVE_IDX]);



	kfree(data);

	rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated);

	return rc;

}

EXPORT_SYMBOL_GPL(tpm_show_temp_deactivated);
@@ -727,77 +671,64 @@ static const u8 pcrread[] = { 
ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr,

		      char *buf)

{

	cap_t cap;

	u8 *data;

	ssize_t rc;

	int i, j, num_pcrs;

	__be32 index;

	char *str = buf;



	struct tpm_chip *chip = dev_get_drvdata(dev);

	if (chip == NULL)

		return -ENODEV;



	data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);

	if (!data)

		return -ENOMEM;



	memcpy(data, tpm_cap, sizeof(tpm_cap));

	data[TPM_CAP_IDX] = TPM_CAP_PROP;

	data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_PCR;



	rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,

	rc = tpm_getcap(dev, TPM_CAP_PROP_PCR, &cap,

			"attempting to determine the number of PCRS");

	if (rc) {

		kfree(data);

	if (rc)

		return 0;

	}



	num_pcrs = be32_to_cpu(*((__be32 *) (data + 14)));

	num_pcrs = be32_to_cpu(cap.num_pcrs);

	for (i = 0; i < num_pcrs; i++) {

		memcpy(data, pcrread, sizeof(pcrread));

		index = cpu_to_be32(i);

		memcpy(data + 10, &index, 4);

		rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,

		rc = transmit_cmd(chip, (struct tpm_cmd_t *)data,

				  TPM_INTERNAL_RESULT_SIZE,

				  "attempting to read a PCR");

		if (rc)

			goto out;

			break;

		str += sprintf(str, "PCR-%02d: ", i);

		for (j = 0; j < TPM_DIGEST_SIZE; j++)

			str += sprintf(str, "%02X ", *(data + 10 + j));

		str += sprintf(str, "\n");

	}

out:

	kfree(data);

	return str - buf;

}

EXPORT_SYMBOL_GPL(tpm_show_pcrs);



#define  READ_PUBEK_RESULT_SIZE 314

static const u8 readpubek[] = {

	0, 193,			/* TPM_TAG_RQU_COMMAND */

	0, 0, 0, 30,		/* length */

	0, 0, 0, 124,		/* TPM_ORD_ReadPubek */

#define TPM_ORD_READPUBEK cpu_to_be32(124)

struct tpm_input_header tpm_readpubek_header = {

	.tag = TPM_TAG_RQU_COMMAND,

	.length = cpu_to_be32(30),

	.ordinal = TPM_ORD_READPUBEK

};



ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,

		       char *buf)

{

	u8 *data;

	struct tpm_cmd_t tpm_cmd;

	ssize_t err;

	int i, rc;

	char *str = buf;



	struct tpm_chip *chip = dev_get_drvdata(dev);

	if (chip == NULL)

		return -ENODEV;



	data = kzalloc(READ_PUBEK_RESULT_SIZE, GFP_KERNEL);

	if (!data)

		return -ENOMEM;



	memcpy(data, readpubek, sizeof(readpubek));



	err = transmit_cmd(chip, data, READ_PUBEK_RESULT_SIZE,

	tpm_cmd.header.in = tpm_readpubek_header;

	err = transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE,

			"attempting to read the PUBEK");

	if (err)

		goto out;
@@ -812,7 +743,7 @@ ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr, 
	   256 byte modulus

	   ignore checksum 20 bytes

	 */



	data = tpm_cmd.params.readpubek_out_buffer;

	str +=

	    sprintf(str,

		    "Algorithm: %02X %02X %02X %02X\nEncscheme: %02X %02X\n"
@@ -832,65 +763,33 @@ ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr, 
	}

out:

	rc = str - buf;

	kfree(data);

	return rc;

}

EXPORT_SYMBOL_GPL(tpm_show_pubek);



#define CAP_VERSION_1_1 6

#define CAP_VERSION_1_2 0x1A

#define CAP_VERSION_IDX 13

static const u8 cap_version[] = {

	0, 193,			/* TPM_TAG_RQU_COMMAND */

	0, 0, 0, 18,		/* length */

	0, 0, 0, 101,		/* TPM_ORD_GetCapability */

	0, 0, 0, 0,

	0, 0, 0, 0

};



ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr,

		      char *buf)

{

	u8 *data;

	cap_t cap;

	ssize_t rc;

	char *str = buf;



	struct tpm_chip *chip = dev_get_drvdata(dev);

	if (chip == NULL)

		return -ENODEV;



	data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);

	if (!data)

		return -ENOMEM;



	memcpy(data, tpm_cap, sizeof(tpm_cap));

	data[TPM_CAP_IDX] = TPM_CAP_PROP;

	data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_MANUFACTURER;



	rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,

	rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,

			"attempting to determine the manufacturer");

	if (rc) {

		kfree(data);

	if (rc)

		return 0;

	}



	str += sprintf(str, "Manufacturer: 0x%x\n",

		       be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX))));

		       be32_to_cpu(cap.manufacturer_id));



	memcpy(data, cap_version, sizeof(cap_version));

	data[CAP_VERSION_IDX] = CAP_VERSION_1_1;

	rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,

	rc = tpm_getcap(dev, CAP_VERSION_1_1, &cap,

		        "attempting to determine the 1.1 version");

	if (rc)

		goto out;



		return 0;

	str += sprintf(str,

		       "TCG version: %d.%d\nFirmware version: %d.%d\n",

		       (int) data[14], (int) data[15], (int) data[16],

		       (int) data[17]);



out:

	kfree(data);

		       cap.tpm_version.Major, cap.tpm_version.Minor,

		       cap.tpm_version.revMajor, cap.tpm_version.revMinor);

	return str - buf;

}

EXPORT_SYMBOL_GPL(tpm_show_caps);
@@ -898,51 +797,25 @@ EXPORT_SYMBOL_GPL(tpm_show_caps); 
ssize_t tpm_show_caps_1_2(struct device * dev,

			  struct device_attribute * attr, char *buf)

{

	u8 *data;

	ssize_t len;

	cap_t cap;

	ssize_t rc;

	char *str = buf;



	struct tpm_chip *chip = dev_get_drvdata(dev);

	if (chip == NULL)

		return -ENODEV;



	data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);

	if (!data)

		return -ENOMEM;



	memcpy(data, tpm_cap, sizeof(tpm_cap));

	data[TPM_CAP_IDX] = TPM_CAP_PROP;

	data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_MANUFACTURER;



	len = tpm_transmit(chip, data, TPM_INTERNAL_RESULT_SIZE);

	if (len <= TPM_ERROR_SIZE) {

		dev_dbg(chip->dev, "A TPM error (%d) occurred "

			"attempting to determine the manufacturer\n",

			be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX))));

		kfree(data);

	rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,

			"attempting to determine the manufacturer");

	if (rc)

		return 0;

	}



	str += sprintf(str, "Manufacturer: 0x%x\n",

		       be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX))));



	memcpy(data, cap_version, sizeof(cap_version));

	data[CAP_VERSION_IDX] = CAP_VERSION_1_2;



	len = tpm_transmit(chip, data, TPM_INTERNAL_RESULT_SIZE);

	if (len <= TPM_ERROR_SIZE) {

		dev_err(chip->dev, "A TPM error (%d) occurred "

			"attempting to determine the 1.2 version\n",

			be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX))));

		goto out;

	}

		       be32_to_cpu(cap.manufacturer_id));

	rc = tpm_getcap(dev, CAP_VERSION_1_2, &cap,

			 "attempting to determine the 1.2 version");

	if (rc)

		return 0;

	str += sprintf(str,

		       "TCG version: %d.%d\nFirmware version: %d.%d\n",

		       (int) data[16], (int) data[17], (int) data[18],

		       (int) data[19]);



out:

	kfree(data);

		       cap.tpm_version_1_2.Major, cap.tpm_version_1_2.Minor,

		       cap.tpm_version_1_2.revMajor,

		       cap.tpm_version_1_2.revMinor);

	return str - buf;

}

EXPORT_SYMBOL_GPL(tpm_show_caps_1_2);

drivers/char/tpm/tpm.h

+124 −0
Original line number Diff line number Diff line
@@ -123,6 +123,130 @@ static inline void tpm_write_index(int base, int index, int value) 
	outb(index, base);

	outb(value & 0xFF, base+1);

}

struct tpm_input_header {

	__be16	tag;

	__be32	length;

	__be32	ordinal;

}__attribute__((packed));



struct tpm_output_header {

	__be16	tag;

	__be32	length;

	__be32	return_code;

}__attribute__((packed));



struct	stclear_flags_t {

	__be16	tag;

	u8	deactivated;

	u8	disableForceClear;

	u8	physicalPresence;

	u8	physicalPresenceLock;

	u8	bGlobalLock;

}__attribute__((packed));



struct	tpm_version_t {

	u8	Major;

	u8	Minor;

	u8	revMajor;

	u8	revMinor;

}__attribute__((packed));



struct	tpm_version_1_2_t {

	__be16	tag;

	u8	Major;

	u8	Minor;

	u8	revMajor;

	u8	revMinor;

}__attribute__((packed));



struct	timeout_t {

	__be32	a;

	__be32	b;

	__be32	c;

	__be32	d;

}__attribute__((packed));



struct duration_t {

	__be32	tpm_short;

	__be32	tpm_medium;

	__be32	tpm_long;

}__attribute__((packed));



struct permanent_flags_t {

	__be16	tag;

	u8	disable;

	u8	ownership;

	u8	deactivated;

	u8	readPubek;

	u8	disableOwnerClear;

	u8	allowMaintenance;

	u8	physicalPresenceLifetimeLock;

	u8	physicalPresenceHWEnable;

	u8	physicalPresenceCMDEnable;

	u8	CEKPUsed;

	u8	TPMpost;

	u8	TPMpostLock;

	u8	FIPS;

	u8	operator;

	u8	enableRevokeEK;

	u8	nvLocked;

	u8	readSRKPub;

	u8	tpmEstablished;

	u8	maintenanceDone;

	u8	disableFullDALogicInfo;

}__attribute__((packed));



typedef union {

	struct	permanent_flags_t perm_flags;

	struct	stclear_flags_t	stclear_flags;

	bool	owned;

	__be32	num_pcrs;

	struct	tpm_version_t	tpm_version;

	struct	tpm_version_1_2_t tpm_version_1_2;

	__be32	manufacturer_id;

	struct timeout_t  timeout;

	struct duration_t duration;

} cap_t;



struct	tpm_getcap_params_in {

	__be32	cap;

	__be32	subcap_size;

	__be32	subcap;

}__attribute__((packed));



struct	tpm_getcap_params_out {

	__be32	cap_size;

	cap_t	cap;

}__attribute__((packed));



struct	tpm_readpubek_params_out {

	u8	algorithm[4];

	u8	encscheme[2];

	u8	sigscheme[2];

	u8	parameters[12]; /*assuming RSA*/

	__be32	keysize;

	u8	modulus[256];

	u8	checksum[20];

}__attribute__((packed));



typedef union {

	struct	tpm_input_header in;

	struct	tpm_output_header out;

} tpm_cmd_header;



typedef union {

	struct	tpm_getcap_params_out getcap_out;

	struct	tpm_readpubek_params_out readpubek_out;

	u8	readpubek_out_buffer[sizeof(struct tpm_readpubek_params_out)];

	struct	tpm_getcap_params_in getcap_in;

} tpm_cmd_params;



struct tpm_cmd_t {

	tpm_cmd_header	header;

	tpm_cmd_params	params;

}__attribute__((packed));



ssize_t	tpm_getcap(struct device *, __be32, cap_t *, const char *);



extern void tpm_get_timeouts(struct tpm_chip *);

extern void tpm_gen_interrupt(struct tpm_chip *);

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