1 files changed, 103 insertions, 0 deletions
diff --git a/src/drivers/i2c/tpm/tis_i2c.c b/src/drivers/i2c/tpm/tis_i2c.c
new file mode 100644
index 0000000000..59971a2631
--- /dev/null
+++ b/src/drivers/i2c/tpm/tis_i2c.c
@@ -0,0 +1,103 @@
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but without any warranty; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <stdint.h>
+#include <string.h>
+#include <device/i2c.h>
+#include "tis.h"
+#include "tpm.h"
+
+static unsigned bus = 0;
+
+static int opened;
+
+void tis_set_i2c_bus(unsigned _bus)
+{
+	bus = _bus;
+}
+
+int tis_open(void)
+{
+	opened = 1;
+	if (tpm_open(bus, CONFIG_DRIVER_TPM_I2C_ADDR)) {
+		opened = 0;
+		return -1;
+	}
+	return 0;
+}
+
+int tis_close(void)
+{
+	opened = 0;
+	tpm_close();
+	return 0;
+}
+
+int tis_init(void)
+{
+	int chip = CONFIG_DRIVER_TPM_I2C_ADDR;
+
+	/*
+	 * Probe TPM twice; the first probing might fail because TPM is asleep,
+	 * and the probing can wake up TPM.
+	 */
+	uint8_t tmp;
+	if (!bus)
+		return -1;
+
+	if (i2c_read(bus, chip, 0, 0, &tmp, sizeof(tmp)) &&
+			i2c_read(bus, chip, 0, 0, &tmp, sizeof(tmp)))
+		return -1;
+
+	return 0;
+}
+
+int tis_sendrecv(const uint8_t *sendbuf, size_t sbuf_size,
+		uint8_t *recvbuf, size_t *rbuf_len)
+{
+	uint8_t buf[TPM_BUFSIZE];
+
+	if (!opened && tis_open())
+		return -1;
+
+	if (sizeof(buf) < sbuf_size)
+		return -1;
+
+	memcpy(buf, sendbuf, sbuf_size);
+
+	int len = tpm_transmit(buf, sbuf_size);
+
+	if (len < 10) {
+		*rbuf_len = 0;
+		return -1;
+	}
+
+	if (len > *rbuf_len) {
+		*rbuf_len = len;
+		return -1;
+	}
+
+	memcpy(recvbuf, buf, len);
+	*rbuf_len = len;
+
+	return 0;
+}