tpm: merge duplicate transmit_cmd() functions

Merged transmit_cmd() functions in tpm-interface.c and tpm-sysfs.c.
Added "tpm_" prefix for consistency sake. Changed cmd parameter as
opaque. This enables to use separate command structures for TPM1
and TPM2 commands in future. Loose coupling works fine here.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Reviewed-by: Jasob Gunthorpe <jason.gunthorpe@obsidianresearch.com>
Reviewed-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Reviewed-by: Peter Huewe <peterhuewe@gmx.de>
Tested-by: Scot Doyle <lkml14@scotdoyle.com>
Tested-by: Peter Huewe <peterhuewe@gmx.de>
Signed-off-by: Peter Huewe <peterhuewe@gmx.de>

diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index cfb9089..c17aa45 100644 (file)
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -398,9 +398,10 @@ out:
 #define TPM_DIGEST_SIZE 20
 #define TPM_RET_CODE_IDX 6
 
-static ssize_t transmit_cmd(struct tpm_chip *chip, struct tpm_cmd_t *cmd,
-                           int len, const char *desc)
+ssize_t tpm_transmit_cmd(struct tpm_chip *chip, void *cmd,
+                        int len, const char *desc)
 {
+       struct tpm_output_header *header;
        int err;
 
        len = tpm_transmit(chip, (u8 *) cmd, len);
@@ -409,7 +410,9 @@ static ssize_t transmit_cmd(struct tpm_chip *chip, struct tpm_cmd_t *cmd,
        else if (len < TPM_HEADER_SIZE)
                return -EFAULT;
 
-       err = be32_to_cpu(cmd->header.out.return_code);
+       header = cmd;
+
+       err = be32_to_cpu(header->return_code);
        if (err != 0 && desc)
                dev_err(chip->dev, "A TPM error (%d) occurred %s\n", err, desc);
 
@@ -448,7 +451,7 @@ ssize_t tpm_getcap(struct device *dev, __be32 subcap_id, cap_t *cap,
                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);
+       rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, desc);
        if (!rc)
                *cap = tpm_cmd.params.getcap_out.cap;
        return rc;
@@ -464,8 +467,8 @@ void tpm_gen_interrupt(struct tpm_chip *chip)
        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, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
-                       "attempting to determine the timeouts");
+       rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
+                             "attempting to determine the timeouts");
 }
 EXPORT_SYMBOL_GPL(tpm_gen_interrupt);
 
@@ -484,8 +487,8 @@ static int tpm_startup(struct tpm_chip *chip, __be16 startup_type)
        struct tpm_cmd_t start_cmd;
        start_cmd.header.in = tpm_startup_header;
        start_cmd.params.startup_in.startup_type = startup_type;
-       return transmit_cmd(chip, &start_cmd, TPM_INTERNAL_RESULT_SIZE,
-                           "attempting to start the TPM");
+       return tpm_transmit_cmd(chip, &start_cmd, TPM_INTERNAL_RESULT_SIZE,
+                               "attempting to start the TPM");
 }
 
 int tpm_get_timeouts(struct tpm_chip *chip)
@@ -500,7 +503,7 @@ int tpm_get_timeouts(struct tpm_chip *chip)
        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, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, NULL);
+       rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, NULL);
 
        if (rc == TPM_ERR_INVALID_POSTINIT) {
                /* The TPM is not started, we are the first to talk to it.
@@ -513,7 +516,7 @@ int tpm_get_timeouts(struct tpm_chip *chip)
                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, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
+               rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
                                  NULL);
        }
        if (rc) {
@@ -575,8 +578,8 @@ duration:
        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, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
-                       "attempting to determine the durations");
+       rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
+                             "attempting to determine the durations");
        if (rc)
                return rc;
 
@@ -631,8 +634,8 @@ static int tpm_continue_selftest(struct tpm_chip *chip)
        struct tpm_cmd_t cmd;
 
        cmd.header.in = continue_selftest_header;
-       rc = transmit_cmd(chip, &cmd, CONTINUE_SELFTEST_RESULT_SIZE,
-                         "continue selftest");
+       rc = tpm_transmit_cmd(chip, &cmd, CONTINUE_SELFTEST_RESULT_SIZE,
+                             "continue selftest");
        return rc;
 }
 
@@ -672,8 +675,8 @@ int tpm_pcr_read_dev(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
 
        cmd.header.in = pcrread_header;
        cmd.params.pcrread_in.pcr_idx = cpu_to_be32(pcr_idx);
-       rc = transmit_cmd(chip, &cmd, READ_PCR_RESULT_SIZE,
-                         "attempting to read a pcr value");
+       rc = tpm_transmit_cmd(chip, &cmd, READ_PCR_RESULT_SIZE,
+                             "attempting to read a pcr value");
 
        if (rc == 0)
                memcpy(res_buf, cmd.params.pcrread_out.pcr_result,
@@ -737,8 +740,8 @@ int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash)
        cmd.header.in = pcrextend_header;
        cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(pcr_idx);
        memcpy(cmd.params.pcrextend_in.hash, hash, TPM_DIGEST_SIZE);
-       rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
-                         "attempting extend a PCR value");
+       rc = tpm_transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
+                             "attempting extend a PCR value");
 
        tpm_chip_put(chip);
        return rc;
@@ -817,7 +820,7 @@ int tpm_send(u32 chip_num, void *cmd, size_t buflen)
        if (chip == NULL)
                return -ENODEV;
 
-       rc = transmit_cmd(chip, cmd, buflen, "attempting tpm_cmd");
+       rc = tpm_transmit_cmd(chip, cmd, buflen, "attempting tpm_cmd");
 
        tpm_chip_put(chip);
        return rc;
@@ -938,14 +941,14 @@ int tpm_pm_suspend(struct device *dev)
                cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(tpm_suspend_pcr);
                memcpy(cmd.params.pcrextend_in.hash, dummy_hash,
                       TPM_DIGEST_SIZE);
-               rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
-                                 "extending dummy pcr before suspend");
+               rc = tpm_transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
+                                     "extending dummy pcr before suspend");
        }
 
        /* now do the actual savestate */
        for (try = 0; try < TPM_RETRY; try++) {
                cmd.header.in = savestate_header;
-               rc = transmit_cmd(chip, &cmd, SAVESTATE_RESULT_SIZE, NULL);
+               rc = tpm_transmit_cmd(chip, &cmd, SAVESTATE_RESULT_SIZE, NULL);
 
                /*
                 * If the TPM indicates that it is too busy to respond to
@@ -1022,7 +1025,7 @@ int tpm_get_random(u32 chip_num, u8 *out, size_t max)
                tpm_cmd.header.in = tpm_getrandom_header;
                tpm_cmd.params.getrandom_in.num_bytes = cpu_to_be32(num_bytes);
 
-               err = transmit_cmd(chip, &tpm_cmd,
+               err = tpm_transmit_cmd(chip, &tpm_cmd,
                                   TPM_GETRANDOM_RESULT_SIZE + num_bytes,
                                   "attempting get random");
                if (err)

diff --git a/drivers/char/tpm/tpm-sysfs.c b/drivers/char/tpm/tpm-sysfs.c
index 01730a2..8ecb052 100644 (file)
--- a/drivers/char/tpm/tpm-sysfs.c
+++ b/drivers/char/tpm/tpm-sysfs.c
@@ -20,25 +20,6 @@
 #include <linux/device.h>
 #include "tpm.h"
 
-/* XXX for now this helper is duplicated in tpm-interface.c */
-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, (u8 *) cmd, len);
-       if (len <  0)
-               return len;
-       else if (len < TPM_HEADER_SIZE)
-               return -EFAULT;
-
-       err = be32_to_cpu(cmd->header.out.return_code);
-       if (err != 0 && desc)
-               dev_err(chip->dev, "A TPM error (%d) occurred %s\n", err, desc);
-
-       return err;
-}
-
 #define READ_PUBEK_RESULT_SIZE 314
 #define TPM_ORD_READPUBEK cpu_to_be32(124)
 static struct tpm_input_header tpm_readpubek_header = {
@@ -58,8 +39,8 @@ static ssize_t pubek_show(struct device *dev, struct device_attribute *attr,
        struct tpm_chip *chip = dev_get_drvdata(dev);
 
        tpm_cmd.header.in = tpm_readpubek_header;
-       err = transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE,
-                          "attempting to read the PUBEK");
+       err = tpm_transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE,
+                              "attempting to read the PUBEK");
        if (err)
                goto out;
 

diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index e4d0888..e638eb0 100644 (file)
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -314,9 +314,10 @@ struct tpm_cmd_t {
 } __packed;
 
 ssize_t        tpm_getcap(struct device *, __be32, cap_t *, const char *);
-
 ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
                     size_t bufsiz);
+ssize_t tpm_transmit_cmd(struct tpm_chip *chip, void *cmd, int len,
+                        const char *desc);
 extern int tpm_get_timeouts(struct tpm_chip *);
 extern void tpm_gen_interrupt(struct tpm_chip *);
 extern int tpm_do_selftest(struct tpm_chip *);