[PATCH] tpm: driver for next generation TPM chips

The driver for the next generation of TPM chips version 1.2 including support
for interrupts.  The Trusted Computing Group has written the TPM Interface
Specification (TIS) which defines a common interface for all manufacturer's
1.2 TPM's thus the name tpm_tis.

Signed-off-by: Leendert van Doorn <[email protected]>
Signed-off-by: Kylene Hall <[email protected]>
Cc: Greg KH <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

Author: Leendert van Doorn

drivers/char/tpm/Kconfig

@@ -20,9 +20,18 @@ config TCG_TPM
 	  Note: For more TPM drivers enable CONFIG_PNP, CONFIG_ACPI
 	  and CONFIG_PNPACPI.
 
+config TCG_TIS
+	tristate "TPM Interface Specification 1.2 Interface"
+	depends on TCG_TPM
+	---help---
+	  If you have a TPM security chip that is compliant with the
+	  TCG TIS 1.2 TPM specification say Yes and it will be accessible
+	  from within Linux.  To compile this driver as a module, choose
+	  M here; the module will be called tpm_tis.
+
 config TCG_NSC
 	tristate "National Semiconductor TPM Interface"
-	depends on TCG_TPM
+	depends on TCG_TPM && PNPACPI
 	---help---
 	  If you have a TPM security chip from National Semicondutor 
 	  say Yes and it will be accessible from within Linux.  To 

drivers/char/tpm/Makefile

@@ -5,6 +5,7 @@ obj-$(CONFIG_TCG_TPM) += tpm.o
 ifdef CONFIG_ACPI
 	obj-$(CONFIG_TCG_TPM) += tpm_bios.o
 endif
+obj-$(CONFIG_TCG_TIS) += tpm_tis.o
 obj-$(CONFIG_TCG_NSC) += tpm_nsc.o
 obj-$(CONFIG_TCG_ATMEL) += tpm_atmel.o
 obj-$(CONFIG_TCG_INFINEON) += tpm_infineon.o

drivers/char/tpm/tpm.c

@@ -390,6 +390,9 @@ static ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
 		goto out;
 	}
 
+	if (chip->vendor.irq)
+		goto out_recv;
+
 	stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal);
 	do {
 		u8 status = chip->vendor.status(chip);

drivers/char/tpm/tpm.h

@@ -64,6 +64,8 @@ struct tpm_vendor_specific {
 	void __iomem *iobase;		/* ioremapped address */
 	unsigned long base;		/* TPM base address */
 
+	int irq;
+
 	int region_size;
 	int have_region;
 
@@ -73,8 +75,13 @@ struct tpm_vendor_specific {
 	u8 (*status) (struct tpm_chip *);
 	struct miscdevice miscdev;
 	struct attribute_group *attr_group;
+	struct list_head list;
+	int locality;
 	u32 timeout_a, timeout_b, timeout_c, timeout_d;
 	u32 duration[3];
+
+	wait_queue_head_t read_queue;
+	wait_queue_head_t int_queue;
 };
 
 struct tpm_chip {
@@ -100,6 +107,8 @@ struct tpm_chip {
 	struct list_head list;
 };
 
+#define to_tpm_chip(n) container_of(n, struct tpm_chip, vendor)
+
 static inline int tpm_read_index(int base, int index)
 {
 	outb(index, base);