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Message-Id: <e828eb98bf5b36fea2bd89760d7bc3cf3d5b6755.1285870690.git.srajiv@linux.vnet.ibm.com>
Date: Thu, 30 Sep 2010 16:09:20 -0300
From: Rajiv Andrade <srajiv@...ux.vnet.ibm.com>
To: linux-kernel@...r.kernel.org
Cc: jmorris@...ei.org, joe@...ches.com, christophe-h.ricard@...com
Subject: [PATCH 1/3] TPM: new stm i2c device driver
From: Christophe Henri RICARD <christophe-h.ricard@...com>
This driver uses the Linux I2C, TPM and generic gpio interfaces.
Signed-off-by: Christophe Henri RICARD <christophe-h.ricard@...com>
Signed-off-by: Rajiv Andrade <srajiv@...ux.vnet.ibm.com>
---
Documentation/tpm/tpm_stm_st19_i2c.txt | 168 +++++++
drivers/char/tpm/Kconfig | 9 +
drivers/char/tpm/Makefile | 1 +
drivers/char/tpm/tpm_stm_st19_i2c.c | 822 ++++++++++++++++++++++++++++++++
drivers/char/tpm/tpm_stm_st19_i2c.h | 63 +++
include/linux/i2c/tpm_stm_st19_i2c.h | 45 ++
6 files changed, 1108 insertions(+), 0 deletions(-)
create mode 100644 Documentation/tpm/tpm_stm_st19_i2c.txt
create mode 100644 drivers/char/tpm/tpm_stm_st19_i2c.c
create mode 100644 drivers/char/tpm/tpm_stm_st19_i2c.h
create mode 100644 include/linux/i2c/tpm_stm_st19_i2c.h
diff --git a/Documentation/tpm/tpm_stm_st19_i2c.txt b/Documentation/tpm/tpm_stm_st19_i2c.txt
new file mode 100644
index 0000000..39e3ed8
--- /dev/null
+++ b/Documentation/tpm/tpm_stm_st19_i2c.txt
@@ -0,0 +1,168 @@
+/*
+ * STMicroelectronics TPM I2C Linux driver for TPM ST19NP18
+ * Copyright (C) 2009, 2010 STMicroelectronics
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * STMicroelectronics version 1.2.0, Copyright (C) 2010
+ * STMicroelectronics comes with ABSOLUTELY NO WARRANTY.
+ * This is free software, and you are welcome to redistribute it
+ * under certain conditions.
+ *
+ * @Author: Christophe RICARD tpmsupport@...com
+ */
+
+PURPOSE OF THE DOCUMENT
+------------------------
+This document is intend to describe how to install the TPM driver for
+TPM ST19NP18 using I2C protocols.
+
+
+PLATFORM USED FOR TESTING
+--------------------------
+During the development, several embedded platforms running ARM CPU have been
+used.
+Validated platforms listing:
+- TI Beagleboard
+- STMicroelectronics Spear 300
+- STMicroelectronics Spear 600
+
+REQUIREMENTS
+-------------
+Software
+=========
+This TPM driver could be install under a kernel which implement at least the
+following features:
+- Linux GENERIC_GPIO programming interfaces.
+- I2C new style programming interface base (with probe & remove functions)
+- 1 I2C adapter (I2C Linux controller driver) or use of I2C_GPIO driver for I2C
+bitbanging.
+
+
+Hardware
+=========
+To run a TPM the platform needs at least:
+- 2 Power supply (3.3V).
+- 1 I2C controller or 2 GPIOs used for SDA & SCL (I2C bit bang method).
+- 2 GPIOs for signals accept_command & data_available.
+
+TPM I2C speed is 100Khz (Maximum)
+
+All TPM signals work at 3.3V
+
+HOW TO INSTALL
+---------------
+Platform installation file
+===========================
+(N.B: platform file in arch/<processor_type>/mach-<platform-name>/
+
+
+1 - Software integration
+=========================
+<processor_type> could be: alpha, arm, avr32, blackfin, cris, frv, h8300, ia64,
+m32r, m68k, m68knommu, parisc, powerpc, s390, sh, sparc, sparc64, um, x86,
+xtensa...
+<platform-name> corresponds to your platform
+
+In the file where the machine_init() function exists, the developer must
+declare:
+- 1 struct st19np18_platform_data to provide which gpio the driver will use.
+ * The accept_pin and data_avail_pin gpio are configured as input only.
+ * This gpio management is under the platform developer responsability.
+
+Finally in the machine_init() function provided in the same file, the developer
+should use the well known function i2c_register_board_info() from the I2C Linux
+API Core.
+
+2- Hardware integration
+========================
+- ST recommends connecting VPS1 and VPS2 to board power supply and at least two
+GNDs (on each side of TSSOP28 package). (See datasheet for further informations)
+
+- As the ST19NP18 has no internal pull up, ST recommands to had:
+ * 2 external pull up on SDA & SCL signals (RpSDA/RpSCL) with value according
+to the abacus on page 40 or the "I2C Bus specification", version 2.1 January
+2000.
+
+
+Platform integration advises
+=============================
+
+For power management purposes, the kernel will send a TPM_SaveState command in the
+suspend tpm driver function.
+If the platform generate a TPM Init event on wakeup, the first TPM command that should
+be executed before the Linux kernel is back (resume function execution) is
+TPM_Startup(ST_STATE).
+
+Here is an example with beagleboard:
+====================================
+Depending on the platform, the developper should specify in
+the platform init file the following informations:
+- The platform gpio's used to managed the tpm's accept_pin/data_avail_pin
+(in a struct st19np18_platform_data declaration).
+- The TPM I2C 7 bits address (TPM_I2C_ST19_ADDR_WR) (in a struct i2c_board_info).
+
+Then the developper should add the TPM slave device to the good i2c adapter with the
+i2c_register_board_info function (Assuming that the gpio and the i2c bus are well configured).
+
+file arch\arm\mach-omap2\board-omap3beagle.c
+add the following:
+-----------------------------------------------------------------------
+
+static struct st19np18_platform_data tpm_data = {
+ .accept_pin = 135,
+ .data_avail_pin = 143,
+};
+
+static struct i2c_board_info __initdata tpm_st19_i2c_board_info[] = {
+ {
+ I2C_BOARD_INFO(TPM_DRIVER_NAME, TPM_I2C_ST19_ADDR_WR),
+ .platform_data = &tpm_data,
+ },
+};
+
+------------------------------------------------------------------------
+Then complete the beagleboard init to be like that:
+------------------------------------------------------------------------
+static void __init omap3_beagle_init(void)
+{
+ omap3_mux_init(board_mux, OMAP_PACKAGE_CBB);
+ omap3_beagle_i2c_init();
+ platform_add_devices(omap3_beagle_devices,
+ ARRAY_SIZE(omap3_beagle_devices));
+ omap_serial_init();
+
+ omap_mux_init_gpio(170, OMAP_PIN_INPUT);
+ gpio_request(170, "DVI_nPD");
+ /* REVISIT leave DVI powered down until it's needed ... */
+ gpio_direction_output(170, true);
+
+ usb_musb_init(&musb_board_data);
+ usb_ehci_init(&ehci_pdata);
+ omap3beagle_flash_init();
+
+ beagle_display_init();
+
+ /* Ensure SDRC pins are mux'd for self-refresh */
+ omap_mux_init_signal("sdrc_cke0", OMAP_PIN_OUTPUT);
+ omap_mux_init_signal("sdrc_cke1", OMAP_PIN_OUTPUT);
+ omap_mux_init_gpio(((struct st19np18_platform_data *)
+ tpm_st19_i2c_board_info[0].platform_data)->data_avail_pin,
+ OMAP_PIN_INPUT);
+ omap_mux_init_gpio(((struct st19np18_platform_data *)
+ tpm_st19_i2c_board_info[0].platform_data)->accept_pin,
+ OMAP_PIN_INPUT);
+
+ i2c_register_board_info(3, tpm_st19_i2c_board_info, ARRAY_SIZE(tpm_st19_i2c_board_info));
+}
diff --git a/drivers/char/tpm/Kconfig b/drivers/char/tpm/Kconfig
index 4dc338f..2e99033 100644
--- a/drivers/char/tpm/Kconfig
+++ b/drivers/char/tpm/Kconfig
@@ -60,4 +60,13 @@ config TCG_INFINEON
Further information on this driver and the supported hardware
can be found at http://www.prosec.rub.de/tpm
+config TCG_ST19_I2C
+ tristate "STMicroelectronics ST19 I2C TPM"
+ depends on I2C
+ depends on GPIOLIB
+ ---help---
+ If you have a TPM security chip from STMicroelectronics working with
+ an I2C bus 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_stm_st19_i2c.
endif # TCG_TPM
diff --git a/drivers/char/tpm/Makefile b/drivers/char/tpm/Makefile
index ea3a1e0..f2f9526 100644
--- a/drivers/char/tpm/Makefile
+++ b/drivers/char/tpm/Makefile
@@ -9,3 +9,4 @@ 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
+obj-$(CONFIG_TCG_ST19_I2C) += tpm_stm_st19_i2c.o
diff --git a/drivers/char/tpm/tpm_stm_st19_i2c.c b/drivers/char/tpm/tpm_stm_st19_i2c.c
new file mode 100644
index 0000000..35307d2
--- /dev/null
+++ b/drivers/char/tpm/tpm_stm_st19_i2c.c
@@ -0,0 +1,822 @@
+/*
+ * STMicroelectronics TPM I2C Linux driver for TPM ST19NP18
+ * Copyright (C) 2009, 2010 STMicroelectronics
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * STMicroelectronics version 1.2.0, Copyright (C) 2010
+ * STMicroelectronics comes with ABSOLUTELY NO WARRANTY.
+ * This is free software, and you are welcome to redistribute it
+ * under certain conditions.
+ *
+ * @Author: Christophe RICARD tpmsupport@...com
+ *
+ * @File: tpm_stm_st19_i2c.c
+ *
+ * @Synopsis:
+ * ----------------------------------------------------------------------
+ * 02/12/2008
+ * - Stand alone implementation (without any TPM api)
+ * ----------------------------------------------------------------------
+ * 03/02/2010
+ * - Power management (suspend and resume functions)
+ * implementation
+ * ----------------------------------------------------------------------
+ * 03/19/2010
+ * - Use of the linux kernel TPM api --> driver/char/tpm
+ * ----------------------------------------------------------------------
+ * 05/26/2010
+ * - Update code for code submission and bug fixes:
+ * - Comments spelling fixes
+ * - Lindent script execution
+ * - checkpatch.pl script execution
+ * - fix syslog error when loaded as a module:
+ * "release() function missing and must be fixed"
+ * - name files change from
+ * stm_st19_tpm_i2c to tpm_stm_st19_i2c
+ * ----------------------------------------------------------------------
+ * 06/15/2010
+ * - Update for new tpm core device.
+ * num_opens --> is_open
+ * ----------------------------------------------------------------------
+ * 07/08/2010
+ * - Update probe, resume suspend functions
+ * - Fix issue suspend buffer and work around related to the
+ * chip->data_buffer not allocated.
+ * ----------------------------------------------------------------------
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/i2c-id.h>
+#include <linux/wait.h>
+#include <linux/string.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/sysfs.h>
+#include <linux/gpio.h>
+#include <linux/sched.h>
+#include <linux/uaccess.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+
+#include <linux/i2c/tpm_stm_st19_i2c.h>
+
+#include "tpm.h"
+
+#include "tpm_stm_st19_i2c.h"
+
+/*
+ * @Comments: tpm_stm_st19_platform_specific.h deliver shows a platform specific
+ * file example.
+ * It has been created to split TPM datas and platform.
+ * This example could be used when the driver is built as a module.
+ * In case of other platform, please add a struct i2c_board_info in your arch/
+ * platform file.
+ */
+static struct st19np18_platform_data *pin_infos;
+
+/*
+ * gpio_readpin is a wrapper to read a gpio value.
+ * Use generic gpio APIs
+ * @param: pin_id, the pin identifier where the value will be read.
+ * @return: the gpio value (should be 0 or 1) or negative errno
+ */
+static int gpio_readpin(int pin_id)
+{
+ int ret;
+ ret = gpio_direction_input(pin_id);
+ if (ret == 0)
+ return gpio_get_value(pin_id);
+ return ret;
+}
+
+/*
+ * gpio_writepin is a wrapper to write a gpio value.
+ * Use generic gpio APIs.
+ * @param: pin_id, the pin identifier where the value will be wrote.
+ * @param: value, the value that will be written.
+ * @return: 0 in case of success
+ */
+#ifdef DEBUG
+static int gpio_writepin(int pin_id, int value)
+{
+ int ret;
+ ret = gpio_direction_output(pin_id, value);
+
+ if (ret == 0)
+ gpio_set_value(pin_id, value);
+ return ret;
+}
+#endif
+
+static int wait_until_good_shape(void)
+{
+ int state_data = 0;
+ int state_command = 0;
+ int timeout = msecs_to_jiffies(STARTUP_WAIT_INTERVAL);
+ int time = msecs_to_jiffies(TICK_GPIO_SPOOLING);
+ int ret = 0;
+ wait_queue_head_t queue;
+
+ int wait_time = 0;
+ DEFINE_WAIT(__wait);
+ init_waitqueue_head(&queue);
+
+ do {
+ prepare_to_wait(&queue, &__wait, TASK_INTERRUPTIBLE);
+ state_data = gpio_readpin(pin_infos->data_avail_pin);
+ state_command = gpio_readpin(pin_infos->accept_pin);
+
+ if (state_data == 0 && state_command > 0)
+ return 0;
+ else if (wait_time >= timeout)
+ return -EIO;
+ else if (!signal_pending(current)) {
+ ret = schedule_timeout(time);
+ wait_time += time;
+ } else
+ ret = -ERESTARTSYS;
+ } while (1);
+ finish_wait(&queue, &__wait);
+
+ return ret;
+}
+
+/*
+ * wait_event_interruptible_on_gpio is a function that poll on
+ * GPIO dataavailable and GPIO acceptcommand
+ * @param: queue, the queue where the work will be stored
+ * @param: timeout, maximal pooling time.
+ * @return: DATA_ON in case of data_available pin goes high (logical value 1).
+ * COMMAND_ON in case of accept_command pin goes high (logical value 1).
+ * -EIO in case of data_available & accept_command pin goes high
+ * (logical value 1).
+ * -EPERM in case of data_available & accept_command pin still low
+ * (logical value 0).
+ */
+static int wait_event_interruptible_on_gpio(wait_queue_head_t queue,
+ int timeout)
+{
+ int state_data = 0;
+ int state_command = 0;
+ int ret = msecs_to_jiffies(TICK_GPIO_SPOOLING);
+ struct tpm_chip *chip =
+ (struct tpm_chip *)i2c_get_clientdata(pin_infos->client);
+ int long_timeout =
+ tpm_calc_ordinal_duration(chip, TPM_I2C_ORDINAL_LONG);
+ int wait_time = 0;
+ DEFINE_WAIT(__wait);
+
+ if (timeout > long_timeout)
+ timeout = long_timeout;
+
+ do {
+ prepare_to_wait(&queue, &__wait, TASK_INTERRUPTIBLE);
+ state_data = gpio_readpin(pin_infos->data_avail_pin);
+ state_command = gpio_readpin(pin_infos->accept_pin);
+
+ if (state_data > 0 || state_command > 0)
+ break;
+ else if (wait_time >= timeout)
+ break;
+ else if (!signal_pending(current)) {
+ ret =
+ schedule_timeout(msecs_to_jiffies
+ (TICK_GPIO_SPOOLING));
+ wait_time += msecs_to_jiffies(TICK_GPIO_SPOOLING);
+ } else {
+ ret = -ERESTARTSYS;
+ break;
+ }
+ } while (1);
+ finish_wait(&queue, &__wait);
+
+ return (state_data && state_command) ? -EIO : state_data ? DATA_ON :
+ state_command ? COMMAND_ON : -EPERM;
+}
+
+/*
+ * responseSize return the command size
+ * @param: buffer, command buffer.
+ * @param: size, the buffer size.
+ * @return: the command size.
+ */
+static int responseSize(const char *buffer, size_t size)
+{
+ size_t val = 0;
+ if (size >= TPM_HEADER_SIZE) {
+ val = (size_t) (((unsigned)buffer[2]) << 24
+ | ((unsigned)buffer[3]) << 16
+ | ((unsigned)buffer[4]) << 8 | (unsigned)
+ buffer[5]);
+ }
+
+ if (val < TPM_BUFSIZE)
+ return val;
+ else
+ return TPM_BUFSIZE;
+}
+
+/*
+ * tpm_stm_i2c_send send TPM commands through the I2C bus.
+ * Before sending any TPM commands, tpm_stm_i2c_send poll data_available and
+ * accept_command TPM GPIOs.
+ *
+ * In case the data_available is high (logical value 1), tpm_stm_i2c_send will
+ * empty the TPM FIFO by reading all the datas stored inside the TPM.
+ *
+ * Then, if the accept_command TPM GPIO is high(logical value 1)
+ * tpm_stm_i2c_send will first send the 10 bytes header of the TCG commands and
+ * then send the others bytes by 40 bytes blocks.
+ *
+ * data_available and accept_command TPM GPIOs will goes low when the TPM
+ * compute the command.
+ *
+ * @param: chip, the tpm_chip description as specified in driver/char/tpm/tpm.h.
+ * @param: buf, the buffer to send.
+ * @param: count, the number of bytes to send.
+ * @return: In case of success the number of bytes sent.
+ * In other case, a < 0 value describing the issue.
+ */
+static int tpm_stm_i2c_send(struct tpm_chip *chip, unsigned char *buf,
+ size_t count)
+{
+ u32 ret = 0, i, size, ordinal, pin = 0;
+ struct i2c_client *client;
+
+#ifdef DEBUG
+ printk(KERN_INFO "tpm_st19_i2c: tpm_stm_i2c_send\n");
+#endif
+
+ if (chip == NULL)
+ return -EBUSY;
+ if (count < TPM_HEADER_SIZE)
+ return -EBUSY;
+ client = (struct i2c_client *)pin_infos->client;
+
+ ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
+
+ /* i2c_client initialization */
+ client->flags = 0;
+
+ /* Wait for AcceptCmd signal high */
+ /* Check if data are available before */
+ /* sending data (data_avail_pin hight) */
+ /* If data are available, we read the data */
+ init_waitqueue_head(&pin_infos->write_queue);
+ pin = wait_event_interruptible_on_gpio(pin_infos->write_queue,
+ tpm_calc_ordinal_duration
+ (chip, ordinal));
+ if (pin < 0) {
+ ret = pin;
+ goto end;
+ }
+
+ client->flags = I2C_M_RD;
+
+ size = TPM_HEADER_SIZE;
+ for (i = 0; pin == DATA_ON && i < size;) {
+ ret = i2c_master_recv(client,
+ pin_infos->tpm_i2c_buffer[1],
+ (i == 0) ? TPM_HEADER_SIZE :
+ count - i > TPM_I2C_BLOCK_SIZE ?
+ TPM_I2C_BLOCK_SIZE : count - i);
+ if (ret < 0)
+ goto end;
+ if (i == 0)
+ size =
+ responseSize(pin_infos->tpm_i2c_buffer[1], count);
+ (i == 0) ? (i += TPM_HEADER_SIZE) : (i += TPM_I2C_BLOCK_SIZE);
+
+ if (i < size)
+ pin =
+ wait_event_interruptible_on_gpio(pin_infos->
+ write_queue,
+ msecs_to_jiffies
+ (TPM_I2C_SHORT));
+ }
+
+ pin = wait_event_interruptible_on_gpio(pin_infos->write_queue,
+ msecs_to_jiffies(TPM_I2C_SHORT));
+
+ /* i2c_client initialization */
+ client->flags = 0;
+
+ size = TPM_HEADER_SIZE;
+ for (i = 0; i < size && pin == COMMAND_ON;) {
+ memcpy(pin_infos->tpm_i2c_buffer[0], buf + i,
+ (i == 0) ? TPM_HEADER_SIZE : count - i >
+ TPM_I2C_BLOCK_SIZE ? TPM_I2C_BLOCK_SIZE : count - i);
+
+ if (i == 0) {
+ size = responseSize(buf, count);
+ size = (size < count ? size : count);
+ }
+ ret =
+ i2c_master_send(client,
+ pin_infos->tpm_i2c_buffer[0],
+ count >= TPM_HEADER_SIZE ? (i ==
+ 0) ?
+ TPM_HEADER_SIZE : count - i >
+ TPM_I2C_BLOCK_SIZE ? TPM_I2C_BLOCK_SIZE :
+ count - i : count);
+ if (ret < 0) {
+ printk(KERN_INFO "tpm_st19_i2c: Failed to send data\n");
+ goto end;
+ }
+
+ (i == 0) ? (i += TPM_HEADER_SIZE) : (i += TPM_I2C_BLOCK_SIZE);
+ /* Wait for AcceptCmd signal hight */
+ if (i < size)
+ pin =
+ wait_event_interruptible_on_gpio(pin_infos->
+ write_queue,
+ msecs_to_jiffies
+ (TPM_I2C_SHORT));
+
+ if (pin != COMMAND_ON) {
+ printk(KERN_INFO
+ "tpm_st19_i2c:"
+ " Failed to read gpio pin (AcceptCmd)\n");
+ ret = -EIO;
+ goto end;
+ }
+ }
+ if (i == 0) {
+ printk(KERN_INFO
+ "tpm_st19_i2c: Failed to read gpio pin (AcceptCmd)\n");
+ ret = -EIO;
+ }
+end:
+ return ret ? ret : count;
+}
+
+/*
+ * tpm_stm_i2c_recv received TPM response through the I2C bus.
+ * Before receiving any TPM response, tpm_stm_i2c_recv poll data_available and
+ * accept_command TPM GPIOs.
+ *
+ * In case the accept_command is high (logical value 1), tpm_stm_i2c_recv will
+ * do nothing.
+ *
+ * Then, if the data_available TPM GPIO is high(logical value 1)
+ * tpm_stm_i2c_recv will first receive the 10 bytes header of the TCG TPM
+ * response and then receive the others bytes by 40 bytes blocks.
+ *
+ * accept_command TPM GPIOs will goes high when the TPM Fofo is empty.
+ *
+ * @param: chip, the tpm_chip description as specified in driver/char/tpm/tpm.h.
+ * @param: buf, the buffer to store datas.
+ * @param: count, the number of bytes to send.
+ * @return: In case of success the number of bytes received.
+ * In other case, a < 0 value describing the issue.
+ */
+static int tpm_stm_i2c_recv(struct tpm_chip *chip, unsigned char *buf,
+ size_t count)
+{
+ int ret = 0;
+ int i, size;
+ int pin = 0;
+ struct i2c_client *client;
+
+#ifdef DEBUG
+ printk(KERN_INFO "tpm_st19_i2c: tpm_stm_i2c_recv\n");
+#endif
+
+ if (chip == NULL)
+ return -EBUSY;
+ if (count < TPM_HEADER_SIZE)
+ return -EBUSY;
+
+ client = (struct i2c_client *)pin_infos->client;
+
+ /* Configure TPM I2C */
+ client->flags = I2C_M_RD;
+
+ /* Spool on the good gpio as long as pin GPIO 3 not HIGHT */
+ init_waitqueue_head(&chip->vendor.read_queue);
+ pin = wait_event_interruptible_on_gpio(chip->vendor.read_queue,
+ tpm_calc_ordinal_duration
+ (chip, TPM_I2C_ORDINAL_LONG));
+
+ size = TPM_HEADER_SIZE;
+ for (i = 0; i < size && pin == DATA_ON;) {
+ ret =
+ i2c_master_recv(client,
+ pin_infos->tpm_i2c_buffer[1],
+ (count >= TPM_HEADER_SIZE ? i ==
+ 0 ? TPM_HEADER_SIZE : (size - i) >
+ TPM_I2C_BLOCK_SIZE ? TPM_I2C_BLOCK_SIZE :
+ size - i : count));
+ if (ret < 0) {
+ printk(KERN_INFO
+ "tpm_st19_i2c:"
+ " Failed to read gpio pin (DataAvalaible)\n");
+ goto end;
+ }
+
+ if (buf != NULL) {
+ memcpy(buf + i, pin_infos->tpm_i2c_buffer[1],
+ (count >= TPM_HEADER_SIZE ? i == 0 ?
+ TPM_HEADER_SIZE : (size - i) >
+ TPM_I2C_BLOCK_SIZE ? TPM_I2C_BLOCK_SIZE : size -
+ i : count));
+
+ if (i == 0) {
+ size = responseSize(buf, size);
+ if (size > count)
+ size = count;
+ }
+ } else {
+ printk(KERN_INFO "tpm_st19_i2c: read buffer is NULL\n");
+ goto end;
+ }
+
+ (i == 0) ? (i += TPM_HEADER_SIZE) : (i += TPM_I2C_BLOCK_SIZE);
+
+ if (i < size)
+ pin =
+ wait_event_interruptible_on_gpio(chip->vendor.
+ read_queue,
+ msecs_to_jiffies
+ (TPM_I2C_SHORT));
+ }
+
+ if (i == 0) {
+ printk(KERN_INFO
+ "tpm_st19_i2c: "
+ "Failed to read gpio pin (DataAvalaible)\n");
+ ret = -EIO;
+ goto end;
+ }
+ return size;
+end:
+ return ret;
+}
+
+/*
+ * tpm_stm_i2c_cancel, cancel is not implemented.
+ * @param: chip, the tpm_chip description as specified in driver/char/tpm/tpm.h.
+ */
+static void tpm_stm_i2c_cancel(struct tpm_chip *chip)
+{
+} /* tpm_stm_i2c_cancel() */
+
+/*
+ * tpm_stm_i2c_status is not implemented because TIS registers are not
+ * implemented.
+ */
+static u8 tpm_stm_i2c_status(struct tpm_chip *chip)
+{
+ return -ENOSYS;
+} /* tpm_stm_i2c_status() */
+
+#ifdef _MODULE
+
+static void tpm_st19_i2c_dummy(struct device *dev)
+{
+
+} /*tpm_st19_i2c_dummy() */
+
+/*
+ * tpm_st19_i2c_release do nothing
+ * @param: kobj, not used
+ */
+static void tpm_st19_i2c_release(struct kobject *kobj)
+{
+ struct tpm_chip *chip;
+ printk(KERN_INFO "tpm_st19_i2c_release\n");
+
+ if (_client != NULL) {
+ chip = (struct tpm_chip *)i2c_get_clientdata(_client);
+
+ if (chip != NULL) {
+ chip->release = tpm_st19_i2c_dummy;
+ chip->dev->release(chip->dev);
+ }
+ }
+} /* tpm_st19_i2c_release() */
+#endif /*_MODULE */
+/*
+ * tpm_st19_i2c_ioctl provides 2 handles:
+ * - TPMIOC_CANCEL: allow to CANCEL a TPM commands execution.
+ * See tpm_stm_i2c_cancel description above
+ * - TPMIOC_TRANSMIT: allow to transmit a TPM commands.
+ *
+ * @return: In case of success, return TPM response size.
+ * In other case return < 0 value describing the issue.
+ */
+static ssize_t tpm_st19_i2c_ioctl(struct inode *inode, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ int in_size = 0, out_size = 0;
+ struct tpm_chip *chip = file->private_data;
+
+ switch (cmd) {
+ case TPMIOC_CANCEL:
+ tpm_stm_i2c_cancel(chip);
+ return -ENOSYS;
+ case TPMIOC_TRANSMIT:
+ if (copy_from_user(pin_infos->tpm_i2c_buffer[0],
+ (const char *)arg, TPM_HEADER_SIZE))
+ return -EFAULT;
+ in_size = responseSize(pin_infos->tpm_i2c_buffer[0],
+ TPM_HEADER_SIZE);
+ if (in_size > sizeof(pin_infos->tpm_i2c_buffer[0]))
+ in_size = sizeof(pin_infos->tpm_i2c_buffer[0]);
+ if (copy_from_user(pin_infos->tpm_i2c_buffer[0],
+ (const char *)arg, in_size))
+ return -EFAULT;
+ tpm_stm_i2c_send(chip, pin_infos->tpm_i2c_buffer[0], in_size);
+
+ out_size = tpm_stm_i2c_recv(chip, pin_infos->tpm_i2c_buffer[1],
+ TPM_BUFSIZE);
+ if (copy_to_user((char *)arg, pin_infos->tpm_i2c_buffer[1],
+ out_size))
+ return -EFAULT;
+ return out_size;
+ default:
+ return -ENOTTY;
+ }
+ return -ENOTTY;
+}
+
+static const struct file_operations tpm_st19_i2c_fops = {
+ .owner = THIS_MODULE,
+ .llseek = no_llseek,
+ .read = tpm_read,
+ .ioctl = tpm_st19_i2c_ioctl,
+ .write = tpm_write,
+ .open = tpm_open,
+ .release = tpm_release,
+};
+
+static DEVICE_ATTR(pubek, S_IRUGO, tpm_show_pubek, NULL);
+static DEVICE_ATTR(pcrs, S_IRUGO, tpm_show_pcrs, NULL);
+static DEVICE_ATTR(enabled, S_IRUGO, tpm_show_enabled, NULL);
+static DEVICE_ATTR(active, S_IRUGO, tpm_show_active, NULL);
+static DEVICE_ATTR(owned, S_IRUGO, tpm_show_owned, NULL);
+static DEVICE_ATTR(temp_deactivated, S_IRUGO, tpm_show_temp_deactivated, NULL);
+static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps_1_2, NULL);
+static DEVICE_ATTR(cancel, S_IWUSR | S_IWGRP, NULL, tpm_store_cancel);
+
+static struct attribute *stm_tpm_attrs[] = {
+ &dev_attr_pubek.attr,
+ &dev_attr_pcrs.attr,
+ &dev_attr_enabled.attr,
+ &dev_attr_active.attr,
+ &dev_attr_owned.attr,
+ &dev_attr_temp_deactivated.attr,
+ &dev_attr_caps.attr,
+ &dev_attr_cancel.attr, NULL,
+};
+
+static struct attribute_group stm_tpm_attr_grp = {
+ .attrs = stm_tpm_attrs
+};
+
+static struct tpm_vendor_specific st_i2c_tpm = {
+ .send = tpm_stm_i2c_send,
+ .recv = tpm_stm_i2c_recv,
+ .cancel = tpm_stm_i2c_cancel,
+ .status = tpm_stm_i2c_status,
+ .attr_group = &stm_tpm_attr_grp,
+ .miscdev = {.fops = &tpm_st19_i2c_fops,},
+};
+
+/*
+ * tpm_st19_i2c_probe initialize the TPM device
+ * @param: client, the i2c_client drescription (TPM I2C description).
+ * @param: id, the i2c_device_id struct.
+ * @return: 0 in case of success.
+ * -1 in other case.
+ */
+static int
+tpm_st19_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
+{
+ int err;
+ struct tpm_chip *chip;
+ struct st19np18_platform_data *platform_data;
+
+ printk(KERN_INFO "tpm_st19_i2c: tpm_st19_i2c_probe\n");
+
+ err = 0;
+
+ /* Check I2C platform functionnalities */
+ if (client == NULL) {
+ printk(KERN_INFO "client is NULL. exiting.\n");
+ err = -ENODEV;
+ goto end;
+ }
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+ printk(KERN_INFO "tpm_st19_i2c: client not i2c capable\n");
+ err = -ENODEV;
+ goto end;
+ }
+
+ chip = tpm_register_hardware(&client->dev, &st_i2c_tpm);
+ if (!chip) {
+ err = -ENODEV;
+ goto end;
+ }
+
+ /*
+ * ST19 TPM does not support interrupt. chip->vendor.irq is only
+ * set to a value greater that 0 because status function have no
+ * sense with this device (TIS register not available)
+ */
+ chip->vendor.irq = 1;
+
+ platform_data = client->dev.platform_data;
+ pin_infos = platform_data;
+ platform_data->tpm_i2c_buffer[0] =
+ kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL);
+ if (platform_data->tpm_i2c_buffer[0] == NULL) {
+ err = -ENOMEM;
+ goto _tpm_clean_answer;
+ }
+ platform_data->tpm_i2c_buffer[1] =
+ kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL);
+ if (platform_data->tpm_i2c_buffer[1] == NULL) {
+ err = -ENOMEM;
+ goto _tpm_clean_response;
+ }
+
+ platform_data->client = client;
+
+ /* Register GPIO pin through generic Linux GPIO API */
+ err = gpio_request(platform_data->accept_pin, "accept command");
+ if (err)
+ goto _gpio_init;
+
+ err = gpio_request(platform_data->data_avail_pin, "data available");
+ if (err)
+ goto _gpio_init;
+
+ err = wait_until_good_shape();
+ if (err)
+ goto _gpio_set;
+
+ tpm_get_timeouts(chip);
+
+ /* attach chip datas to client */
+ i2c_set_clientdata(client, chip);
+ pin_infos->bChipF = false;
+
+ printk(KERN_INFO "tpm_st19_i2c: TPM I2C Initialized\n");
+ return 0;
+_gpio_set:
+_gpio_init:
+ if (platform_data) {
+ gpio_free(platform_data->accept_pin);
+ gpio_free(platform_data->data_avail_pin);
+ }
+_tpm_clean_response:
+ tpm_remove_hardware(chip->dev);
+ if (platform_data->tpm_i2c_buffer[1] != NULL) {
+ kfree(platform_data->tpm_i2c_buffer[1]);
+ platform_data->tpm_i2c_buffer[1] = NULL;
+ }
+_tpm_clean_answer:
+ if (platform_data->tpm_i2c_buffer[0] != NULL) {
+ kfree(platform_data->tpm_i2c_buffer[0]);
+ platform_data->tpm_i2c_buffer[0] = NULL;
+ }
+ pin_infos->bChipF = true;
+end:
+ printk(KERN_INFO "tpm_st19_i2c: TPM I2C initialisation fail\n");
+ return err;
+}
+
+/*
+ * tpm_st19_i2c_remove remove the TPM device
+ * @param: client, the i2c_client drescription (TPM I2C description).
+ clear_bit(0, &chip->is_open);
+ * @return: 0 in case of success.
+ */
+static __devexit int tpm_st19_i2c_remove(struct i2c_client *client)
+{
+ struct tpm_chip *chip = (struct tpm_chip *)i2c_get_clientdata(client);
+ printk(KERN_INFO "tpm_st19_i2c: tpm_st19_i2c_remove\n");
+
+ if (pin_infos != NULL) {
+ gpio_free(pin_infos->accept_pin);
+ gpio_free(pin_infos->data_avail_pin);
+
+ /* Check if chip has been previously clean */
+ if (pin_infos->bChipF != true)
+ tpm_remove_hardware(chip->dev);
+ if (pin_infos->tpm_i2c_buffer[1] != NULL) {
+ kfree(pin_infos->tpm_i2c_buffer[1]);
+ pin_infos->tpm_i2c_buffer[1] = NULL;
+ }
+ if (pin_infos->tpm_i2c_buffer[0] != NULL) {
+ kfree(pin_infos->tpm_i2c_buffer[0]);
+ pin_infos->tpm_i2c_buffer[0] = NULL;
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * tpm_st19_i2c_pm_suspend suspend the TPM device
+ * Added: Work around when suspend and no tpm application is running, suspend
+ * may fail because chip->data_buffer is not set (only set in tpm_open in Linux
+ * TPM core)
+ * @param: client, the i2c_client drescription (TPM I2C description).
+ * @param: mesg, the power management message.
+ * @return: 0 in case of success.
+ */
+static int tpm_st19_i2c_pm_suspend(struct i2c_client *client, pm_message_t mesg)
+{
+ struct tpm_chip *chip =
+ (struct tpm_chip *)i2c_get_clientdata(pin_infos->client);
+ int ret = 0;
+ if (chip->data_buffer == NULL)
+ chip->data_buffer = pin_infos->tpm_i2c_buffer[0];
+ ret = tpm_pm_suspend(&client->dev, mesg);
+ return ret;
+} /* tpm_st19_i2c_suspend() */
+
+/*
+ * tpm_st19_i2c_pm_resume resume the TPM device
+ * This part of the Linux driver should be move in an other part or
+ * environment (bootloader ?)
+ * @param: client, the i2c_client drescription (TPM I2C description).
+ * @return: 0 in case of success.
+ */
+static int tpm_st19_i2c_pm_resume(struct i2c_client *client)
+{
+ struct tpm_chip *chip =
+ (struct tpm_chip *)i2c_get_clientdata(pin_infos->client);
+ int ret = 0;
+ if (chip->data_buffer == NULL)
+ chip->data_buffer = pin_infos->tpm_i2c_buffer[0];
+ ret = tpm_pm_resume(&client->dev);
+ return ret;
+} /* tpm_st19_i2c_pm_resume() */
+
+static const struct i2c_device_id tpm_st19_i2c_id[] = {
+ {TPM_DRIVER_NAME, 0},
+ {}
+};
+
+MODULE_DEVICE_TABLE(i2c, tpm_st19_i2c_id);
+
+static struct i2c_driver tpm_st19_i2c_driver = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = TPM_DRIVER_NAME,
+ },
+ .probe = tpm_st19_i2c_probe,
+ .remove = tpm_st19_i2c_remove,
+ .resume = tpm_st19_i2c_pm_resume,
+ .suspend = tpm_st19_i2c_pm_suspend,
+ .id_table = tpm_st19_i2c_id
+};
+
+/*
+ * tpm_st19_i2c_init initialize driver
+ * @return: 0 if successful, else non zero value.
+ */
+static int __init tpm_st19_i2c_init(void)
+{
+ printk(KERN_INFO "tpm_st19_i2c: tpm_st19_i2c_init\n");
+ return i2c_add_driver(&tpm_st19_i2c_driver);
+}
+
+/*
+ * tpm_st19_i2c_exit The kernel calls this function during unloading the
+ * module or during shut down process
+ */
+static void __exit tpm_st19_i2c_exit(void)
+{
+ printk(KERN_INFO "tpm_st19_i2c: tpm_st19_i2c_exit\n");
+ i2c_del_driver(&tpm_st19_i2c_driver);
+}
+
+module_init(tpm_st19_i2c_init);
+module_exit(tpm_st19_i2c_exit);
+
+MODULE_AUTHOR("Christophe Ricard (tpmsupport@...com)");
+MODULE_DESCRIPTION("STM TPM I2C ST19 Driver");
+MODULE_VERSION("1.2.0");
+MODULE_LICENSE("GPL");
diff --git a/drivers/char/tpm/tpm_stm_st19_i2c.h b/drivers/char/tpm/tpm_stm_st19_i2c.h
new file mode 100644
index 0000000..db3a059
--- /dev/null
+++ b/drivers/char/tpm/tpm_stm_st19_i2c.h
@@ -0,0 +1,63 @@
+/*
+ * STMicroelectronics TPM I2C Linux driver for TPM ST19NP18
+ * Copyright (C) 2009, 2010 STMicroelectronics
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * STMicroelectronics version 1.2.0, Copyright (C) 2010
+ * STMicroelectronics comes with ABSOLUTELY NO WARRANTY.
+ * This is free software, and you are welcome to redistribute it
+ * under certain conditions.
+ *
+ * @Author: Christophe RICARD tpmsupport@...com
+ *
+ * @File: stm_st19_tpm_i2c.h
+ *
+ * @Date: 02/12/2008
+ */
+#ifndef __STM_ST19_TPM_I2C_MAIN_H__
+#define __STM_ST19_TPM_I2C_MAIN_H__
+
+#include <linux/pci.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/i2c.h>
+#include <linux/i2c-id.h>
+#include <linux/fs.h>
+#include <linux/miscdevice.h>
+
+#define MINOR_NUM_I2C 224
+
+#define TPM_DRIVER_NAME "st19np18"
+
+#define TPM_BUFSIZE 2048
+
+#define TPM_HEADER_SIZE 10
+#define TPM_I2C_BLOCK_SIZE 0x28
+
+#define TPM_I2C_ORDINAL_LONG 0x0D /* TPM_ORD_TakeOwnership */
+
+#define TPM_I2C_SHORT 2000 /* 2s */
+#define TICK_GPIO_SPOOLING 2
+#define STARTUP_WAIT_INTERVAL 8 /* 8ms */
+
+/* ioctl commands */
+#define TPMIOC_CANCEL _IO('T', 0x00) /* Not supported */
+#define TPMIOC_TRANSMIT _IO('T', 0x01)
+
+#define DATA_ON 1 /* data available */
+#define COMMAND_ON 2 /* accept command */
+
+#endif /* __STM_ST19_TPM_I2C_MAIN_H__ */
diff --git a/include/linux/i2c/tpm_stm_st19_i2c.h b/include/linux/i2c/tpm_stm_st19_i2c.h
new file mode 100644
index 0000000..cdac5f4
--- /dev/null
+++ b/include/linux/i2c/tpm_stm_st19_i2c.h
@@ -0,0 +1,45 @@
+/*
+ * STMicroelectronics TPM I2C Linux driver for TPM ST19NP18
+ * Copyright (C) 2009, 2010 STMicroelectronics
+ * Christophe RICARD tpmsupport@...com
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * STMicroelectronics version 1.2.0, Copyright (C) 2010
+ * STMicroelectronics comes with ABSOLUTELY NO WARRANTY.
+ * This is free software, and you are welcome to redistribute it
+ * under certain conditions.
+ *
+ * @File: stm_st19_tpm_i2c.h
+ *
+ * @Date: 06/15/2008
+ */
+#ifndef __STM_ST19_TPM_I2C_H__
+#define __STM_ST19_TPM_I2C_H__
+
+#include <linux/i2c.h>
+
+#define TPM_DRIVER_NAME "st19np18"
+#define TPM_I2C_ST19_ADDR_WR (0x26 >> 1)
+
+struct st19np18_platform_data {
+ int accept_pin; /* accept command pin */
+ int data_avail_pin;/* data available pin */
+ struct i2c_client *client;
+ bool bChipF;
+ u8 *tpm_i2c_buffer[2]; /* 0 Request 1 Response */
+ wait_queue_head_t write_queue;
+};
+
+#endif /* __STM_ST19_TPM_I2C_H__ */
--
1.7.2.2
--
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