[PATCH 1/4] tpm: add kdoc for tpm_transmit and tpm_transmit_cmd

* [PATCH 1/4] tpm: add kdoc for tpm_transmit and tpm_transmit_cmd
@ 2016-11-16 17:03 Tomas Winkler
  2016-11-16 17:03 ` [PATCH 2/4 v2] tpm/tpm2-chip: fix kdoc errors Tomas Winkler
                   ` (4 more replies)
  0 siblings, 5 replies; 10+ messages in thread
From: Tomas Winkler @ 2016-11-16 17:03 UTC (permalink / raw)
  To: tpmdd-devel, Jason Gunthorpe, Jarkko Sakkinen; +Cc: linux-kernel, Tomas Winkler

Functions tpm_transmit and transmit_cmd are referenced
from other functions kdoc hence deserve documentation.

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
---
 drivers/char/tpm/tpm-interface.c | 33 ++++++++++++++++++++++++++++-----
 1 file changed, 28 insertions(+), 5 deletions(-)

diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index a2688ac2b48f..56c238a6e005 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -328,8 +328,17 @@ unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip,
 }
 EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration);
 
-/*
- * Internal kernel interface to transmit TPM commands
+/**
+ * tmp_transmit - Internal kernel interface to transmit TPM commands.
+ *
+ * @chip: TPM chip to use
+ * @buf: TPM command buffer
+ * @bufsiz: length of the TPM command buffer
+ * @flags: tpm transmit flags - bitmap
+ *
+ * Return:
+ *     0 when the operation is successful
+ *     A negative number for system errors (errno)
  */
 ssize_t tpm_transmit(struct tpm_chip *chip, const u8 *buf, size_t bufsiz,
 		     unsigned int flags)
@@ -409,9 +418,21 @@ ssize_t tpm_transmit(struct tpm_chip *chip, const u8 *buf, size_t bufsiz,
 	return rc;
 }
 
-#define TPM_DIGEST_SIZE 20
-#define TPM_RET_CODE_IDX 6
-
+/**
+ * tmp_transmit_cmd - send a tpm command to the device
+ *    The function extracts tpm out header return code
+ *
+ * @chip: TPM chip to use
+ * @cmd: TPM command buffer
+ * @len: length of the TPM command
+ * @flags: tpm transmit flags - bitmap
+ * @desc: command description used in the error message
+ *
+ * Return:
+ *     0 when the operation is successful
+ *     A negative number for system errors (errno)
+ *     A positive number for a TPM error.
+ */
 ssize_t tpm_transmit_cmd(struct tpm_chip *chip, const void *cmd,
 			 int len, unsigned int flags, const char *desc)
 {
@@ -434,6 +455,8 @@ ssize_t tpm_transmit_cmd(struct tpm_chip *chip, const void *cmd,
 	return err;
 }
 
+#define TPM_DIGEST_SIZE 20
+#define TPM_RET_CODE_IDX 6
 #define TPM_INTERNAL_RESULT_SIZE 200
 #define TPM_ORD_GET_CAP cpu_to_be32(101)
 #define TPM_ORD_GET_RANDOM cpu_to_be32(70)
-- 
2.7.4

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