[PATCH 11 of 12] Fix Tpm driver -- add cancel function

[Kylene Hall <kjhall@us.ibm.com>]

Userspcace needs to be able to cancel functions which have been sent to 
the TPM (part of the spec.).  Add a sysfs file that communicates this 
desire to the driver and device.

Signed-off-by: Kylene Hall <kjhall@us.ibm.com>
---
--- linux-2.6.12-rc2/drivers/char/tpm/tpm.h	2005-04-21 18:11:12.000000000 -0500
+++ linux-2.6.12-rc2-tpmdd/drivers/char/tpm/tpm.h	2005-04-21 18:28:09.000000000 -0500
@@ -52,6 +52,7 @@ struct tpm_chip;
 struct tpm_vendor_specific {
 	u8 req_complete_mask;
 	u8 req_complete_val;
+	u8 req_canceled;
 	u16 base;		/* TPM base address */
 
 	int (*recv) (struct tpm_chip *, u8 *, size_t);
diff -urpN --exclude='*.orig' linux-2.6.12-rc2/drivers/char/tpm/tpm_atmel.c linux-2.6.12-rc2-tpmdd/drivers/char/tpm/tpm_atmel.c
--- linux-2.6.12-rc2/drivers/char/tpm/tpm_atmel.c	2005-04-25 18:49:08.000000000 -0500
+++ linux-2.6.12-rc2-tpmdd/drivers/char/tpm/tpm_atmel.c	2005-04-26 15:31:57.000000000 -0500
@@ -132,6 +132,7 @@ static struct tpm_vendor_specific tpm_at
 	.cancel = tpm_atml_cancel,
 	.req_complete_mask = ATML_STATUS_BUSY | ATML_STATUS_DATA_AVAIL,
 	.req_complete_val = ATML_STATUS_DATA_AVAIL,
+	.req_canceled = ATML_STATUS_READY,
 	.base = TPM_ATML_BASE,
 	.attr = TPM_DEVICE_ATTRS,
 	.miscdev.fops = &atmel_ops,
diff -urpN --exclude='*.orig' linux-2.6.12-rc2/drivers/char/tpm/tpm_nsc.c linux-2.6.12-rc2-tpmdd/drivers/char/tpm/tpm_nsc.c
--- linux-2.6.12-rc2/drivers/char/tpm/tpm_nsc.c	2005-04-25 18:49:08.000000000 -0500
+++ linux-2.6.12-rc2-tpmdd/drivers/char/tpm/tpm_nsc.c	2005-04-26 15:32:26.000000000 -0500
@@ -230,6 +230,7 @@ static struct tpm_vendor_specific tpm_ns
 	.cancel = tpm_nsc_cancel,
 	.req_complete_mask = NSC_STATUS_OBF,
 	.req_complete_val = NSC_STATUS_OBF,
+	.req_canceled = NSC_STATUS_RDY,
 	.base = TPM_NSC_BASE,
 	.attr = TPM_DEVICE_ATTRS,
 	.miscdev.fops = &nsc_ops,
--- linux-2.6.12-rc2/drivers/char/tpm/tpm.c	2005-04-27 11:13:29.000000000 -0500
+++ linux-2.6.12-rc2-tpmdd/drivers/chat/tpm/tpm.c	2005-04-27 11:32:35.000000000 -0500
@@ -140,7 +140,7 @@ EXPORT_SYMBOL_GPL(tpm_lpc_bus_init);
 static ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
 			    size_t bufsiz)
 {
-	ssize_t len;
+	ssize_t rc;
 	u32 count;
 	__be32 *native_size;
        unsigned long stop;
@@ -158,10 +158,10 @@ static ssize_t tpm_transmit(struct tpm_c
 
 	down(&chip->tpm_mutex);
 
-	if ((len = chip->vendor->send(chip, (u8 *) buf, count)) < 0) {
+	if ((rc = chip->vendor->send(chip, (u8 *) buf, count)) < 0) {
 		dev_err(&chip->pci_dev->dev,
-			"tpm_transmit: tpm_send: error %d\n", len);
-		return len;
+			"tpm_transmit: tpm_send: error %Zd\n", rc);
+		goto out;
 	}
 
        stop = jiffies + 2 * 60 * HZ;
@@ -171,23 +171,31 @@ static ssize_t tpm_transmit(struct tpm_c
 		    chip->vendor->req_complete_val) {
 			goto out_recv;
 		}
-               msleep(TPM_TIMEOUT); /* CHECK */
+
+		if ((status == chip->vendor->req_canceled)) {
+			dev_err(&chip->pci_dev->dev, "Operation Canceled\n");
+			rc = -ECANCELED;
+			goto out;
+		}
+
+		msleep(TPM_TIMEOUT);	/* CHECK */
 		rmb();
        } while (time_before(jiffies, stop));
 
 
 	chip->vendor->cancel(chip);
-	dev_err(&chip->pci_dev->dev, "Time expired\n");
-	up(&chip->tpm_mutex);
-	return -EIO;
+	dev_err(&chip->pci_dev->dev, "Operation Timed out\n");
+	rc = -ETIME;
+	goto out;
 
 out_recv:
-	len = chip->vendor->recv(chip, (u8 *) buf, bufsiz);
-	if (len < 0)
+	rc = chip->vendor->recv(chip, (u8 *) buf, bufsiz);
+	if (rc < 0)
 		dev_err(&chip->pci_dev->dev,
-			"tpm_transmit: tpm_recv: error %d\n", len);
+			"tpm_transmit: tpm_recv: error %Zd\n", rc);
+out:
 	up(&chip->tpm_mutex);
-	return len;
+	return rc;
 }
 
 #define TPM_DIGEST_SIZE 20
-
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