[PATCH] tpm: command duration update

With the TPM 1.2 Specification, each command is classified as short, medium or
long and the chip tells you the maximum amount of time for a response to each
class of command.  This patch provides and array of the classifications and a
function to determine how long the response should be waited for.  Also, it
uses that information in the command processing to determine how long to poll
for.  The function is exported so the 1.2 driver can use the functionality to
determine how long to wait for a DataAvailable interrupt if interrupts are
being used.

Signed-off-by: Kylene Hall <kjhall@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/char/tpm/tpm.h

@@ -63,6 +63,7 @@ struct tpm_vendor_specific {
 	u8 (*status) (struct tpm_chip *);
 	struct miscdevice miscdev;
 	struct attribute_group *attr_group;
+	u32 duration[3];
 };
 
 struct tpm_chip {
@@ -100,6 +101,7 @@ static inline void tpm_write_index(int base, int index, int value)
 	outb(value & 0xFF, base+1);
 }
 
+extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32);
 extern struct tpm_chip* tpm_register_hardware(struct device *,
 				 const struct tpm_vendor_specific *);
 extern int tpm_open(struct inode *, struct file *);