diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/char/tpm/Kconfig | 37 | ||||
| -rw-r--r-- | drivers/char/tpm/Makefile | 11 | ||||
| -rw-r--r-- | drivers/char/tpm/tpm-interface.c (renamed from drivers/char/tpm/tpm.c) | 138 | ||||
| -rw-r--r-- | drivers/char/tpm/tpm.h | 3 | ||||
| -rw-r--r-- | drivers/char/tpm/tpm_atmel.c | 2 | ||||
| -rw-r--r-- | drivers/char/tpm/tpm_eventlog.c | 3 | ||||
| -rw-r--r-- | drivers/char/tpm/tpm_i2c_atmel.c | 284 | ||||
| -rw-r--r-- | drivers/char/tpm/tpm_i2c_infineon.c | 4 | ||||
| -rw-r--r-- | drivers/char/tpm/tpm_i2c_nuvoton.c | 710 | ||||
| -rw-r--r-- | drivers/char/tpm/tpm_i2c_stm_st33.c | 12 | ||||
| -rw-r--r-- | drivers/char/tpm/tpm_ibmvtpm.c | 6 | ||||
| -rw-r--r-- | drivers/char/tpm/tpm_ppi.c | 4 | ||||
| -rw-r--r-- | drivers/char/tpm/tpm_tis.c | 2 | ||||
| -rw-r--r-- | drivers/char/tpm/xen-tpmfront.c | 2 |
14 files changed, 1092 insertions, 126 deletions
diff --git a/drivers/char/tpm/Kconfig b/drivers/char/tpm/Kconfig index 94c0c74434ea..1a65838888cd 100644 --- a/drivers/char/tpm/Kconfig +++ b/drivers/char/tpm/Kconfig @@ -33,6 +33,15 @@ config TCG_TIS from within Linux. To compile this driver as a module, choose M here; the module will be called tpm_tis. +config TCG_TIS_I2C_ATMEL + tristate "TPM Interface Specification 1.2 Interface (I2C - Atmel)" + depends on I2C + ---help--- + If you have an Atmel I2C TPM security chip 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_tis_i2c_atmel. + config TCG_TIS_I2C_INFINEON tristate "TPM Interface Specification 1.2 Interface (I2C - Infineon)" depends on I2C @@ -42,7 +51,17 @@ config TCG_TIS_I2C_INFINEON Specification 0.20 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_tis_i2c_infineon. + will be called tpm_i2c_infineon. + +config TCG_TIS_I2C_NUVOTON + tristate "TPM Interface Specification 1.2 Interface (I2C - Nuvoton)" + depends on I2C + ---help--- + If you have a TPM security chip with an I2C interface from + Nuvoton Technology Corp. 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_i2c_nuvoton. config TCG_NSC tristate "National Semiconductor TPM Interface" @@ -82,14 +101,14 @@ config TCG_IBMVTPM as a module, choose M here; the module will be called tpm_ibmvtpm. config TCG_ST33_I2C - tristate "STMicroelectronics ST33 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_st33_i2c. + tristate "STMicroelectronics ST33 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_st33_i2c. config TCG_XEN tristate "XEN TPM Interface" diff --git a/drivers/char/tpm/Makefile b/drivers/char/tpm/Makefile index eb41ff97d0ad..b80a4000daee 100644 --- a/drivers/char/tpm/Makefile +++ b/drivers/char/tpm/Makefile @@ -2,17 +2,20 @@ # Makefile for the kernel tpm device drivers. # obj-$(CONFIG_TCG_TPM) += tpm.o +tpm-y := tpm-interface.o +tpm-$(CONFIG_ACPI) += tpm_ppi.o + ifdef CONFIG_ACPI - obj-$(CONFIG_TCG_TPM) += tpm_bios.o - tpm_bios-objs += tpm_eventlog.o tpm_acpi.o tpm_ppi.o + tpm-y += tpm_eventlog.o tpm_acpi.o else ifdef CONFIG_TCG_IBMVTPM - obj-$(CONFIG_TCG_TPM) += tpm_bios.o - tpm_bios-objs += tpm_eventlog.o tpm_of.o + tpm-y += tpm_eventlog.o tpm_of.o endif endif obj-$(CONFIG_TCG_TIS) += tpm_tis.o +obj-$(CONFIG_TCG_TIS_I2C_ATMEL) += tpm_i2c_atmel.o obj-$(CONFIG_TCG_TIS_I2C_INFINEON) += tpm_i2c_infineon.o +obj-$(CONFIG_TCG_TIS_I2C_NUVOTON) += tpm_i2c_nuvoton.o obj-$(CONFIG_TCG_NSC) += tpm_nsc.o obj-$(CONFIG_TCG_ATMEL) += tpm_atmel.o obj-$(CONFIG_TCG_INFINEON) += tpm_infineon.o diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm-interface.c index e3c974a6c522..6ae41d337630 100644 --- a/drivers/char/tpm/tpm.c +++ b/drivers/char/tpm/tpm-interface.c @@ -10,13 +10,13 @@ * Maintained by: <tpmdd-devel@lists.sourceforge.net> * * Device driver for TCG/TCPA TPM (trusted platform module). - * Specifications at www.trustedcomputinggroup.org + * Specifications at www.trustedcomputinggroup.org * * 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, version 2 of the * License. - * + * * Note, the TPM chip is not interrupt driven (only polling) * and can have very long timeouts (minutes!). Hence the unusual * calls to msleep. @@ -371,13 +371,14 @@ static ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf, return -ENODATA; if (count > bufsiz) { dev_err(chip->dev, - "invalid count value %x %zx \n", count, bufsiz); + "invalid count value %x %zx\n", count, bufsiz); return -E2BIG; } mutex_lock(&chip->tpm_mutex); - if ((rc = chip->vendor.send(chip, (u8 *) buf, count)) < 0) { + rc = chip->vendor.send(chip, (u8 *) buf, count); + if (rc < 0) { dev_err(chip->dev, "tpm_transmit: tpm_send: error %zd\n", rc); goto out; @@ -444,7 +445,7 @@ static ssize_t transmit_cmd(struct tpm_chip *chip, struct tpm_cmd_t *cmd, { int err; - len = tpm_transmit(chip,(u8 *) cmd, len); + len = tpm_transmit(chip, (u8 *) cmd, len); if (len < 0) return len; else if (len < TPM_HEADER_SIZE) @@ -658,7 +659,7 @@ static int tpm_continue_selftest(struct tpm_chip *chip) return rc; } -ssize_t tpm_show_enabled(struct device * dev, struct device_attribute * attr, +ssize_t tpm_show_enabled(struct device *dev, struct device_attribute *attr, char *buf) { cap_t cap; @@ -674,7 +675,7 @@ ssize_t tpm_show_enabled(struct device * dev, struct device_attribute * attr, } EXPORT_SYMBOL_GPL(tpm_show_enabled); -ssize_t tpm_show_active(struct device * dev, struct device_attribute * attr, +ssize_t tpm_show_active(struct device *dev, struct device_attribute *attr, char *buf) { cap_t cap; @@ -690,7 +691,7 @@ ssize_t tpm_show_active(struct device * dev, struct device_attribute * attr, } EXPORT_SYMBOL_GPL(tpm_show_active); -ssize_t tpm_show_owned(struct device * dev, struct device_attribute * attr, +ssize_t tpm_show_owned(struct device *dev, struct device_attribute *attr, char *buf) { cap_t cap; @@ -706,8 +707,8 @@ ssize_t tpm_show_owned(struct device * dev, struct device_attribute * attr, } EXPORT_SYMBOL_GPL(tpm_show_owned); -ssize_t tpm_show_temp_deactivated(struct device * dev, - struct device_attribute * attr, char *buf) +ssize_t tpm_show_temp_deactivated(struct device *dev, + struct device_attribute *attr, char *buf) { cap_t cap; ssize_t rc; @@ -769,10 +770,10 @@ static int __tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf) /** * tpm_pcr_read - read a pcr value - * @chip_num: tpm idx # or ANY + * @chip_num: tpm idx # or ANY * @pcr_idx: pcr idx to retrieve - * @res_buf: TPM_PCR value - * size of res_buf is 20 bytes (or NULL if you don't care) + * @res_buf: TPM_PCR value + * size of res_buf is 20 bytes (or NULL if you don't care) * * The TPM driver should be built-in, but for whatever reason it * isn't, protect against the chip disappearing, by incrementing @@ -794,9 +795,9 @@ EXPORT_SYMBOL_GPL(tpm_pcr_read); /** * tpm_pcr_extend - extend pcr value with hash - * @chip_num: tpm idx # or AN& + * @chip_num: tpm idx # or AN& * @pcr_idx: pcr idx to extend - * @hash: hash value used to extend pcr value + * @hash: hash value used to extend pcr value * * The TPM driver should be built-in, but for whatever reason it * isn't, protect against the chip disappearing, by incrementing @@ -847,8 +848,7 @@ int tpm_do_selftest(struct tpm_chip *chip) unsigned long duration; struct tpm_cmd_t cmd; - duration = tpm_calc_ordinal_duration(chip, - TPM_ORD_CONTINUE_SELFTEST); + duration = tpm_calc_ordinal_duration(chip, TPM_ORD_CONTINUE_SELFTEST); loops = jiffies_to_msecs(duration) / delay_msec; @@ -965,12 +965,12 @@ ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr, if (err) goto out; - /* + /* ignore header 10 bytes algorithm 32 bits (1 == RSA ) encscheme 16 bits sigscheme 16 bits - parameters (RSA 12->bytes: keybit, #primes, expbit) + parameters (RSA 12->bytes: keybit, #primes, expbit) keylenbytes 32 bits 256 byte modulus ignore checksum 20 bytes @@ -1020,43 +1020,33 @@ ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr, str += sprintf(str, "Manufacturer: 0x%x\n", be32_to_cpu(cap.manufacturer_id)); - rc = tpm_getcap(dev, CAP_VERSION_1_1, &cap, - "attempting to determine the 1.1 version"); - if (rc) - return 0; - str += sprintf(str, - "TCG version: %d.%d\nFirmware version: %d.%d\n", - cap.tpm_version.Major, cap.tpm_version.Minor, - cap.tpm_version.revMajor, cap.tpm_version.revMinor); - return str - buf; -} -EXPORT_SYMBOL_GPL(tpm_show_caps); - -ssize_t tpm_show_caps_1_2(struct device * dev, - struct device_attribute * attr, char *buf) -{ - cap_t cap; - ssize_t rc; - char *str = buf; - - rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap, - "attempting to determine the manufacturer"); - if (rc) - return 0; - str += sprintf(str, "Manufacturer: 0x%x\n", - be32_to_cpu(cap.manufacturer_id)); + /* Try to get a TPM version 1.2 TPM_CAP_VERSION_INFO */ rc = tpm_getcap(dev, CAP_VERSION_1_2, &cap, "attempting to determine the 1.2 version"); - if (rc) - return 0; - str += sprintf(str, - "TCG version: %d.%d\nFirmware version: %d.%d\n", - cap.tpm_version_1_2.Major, cap.tpm_version_1_2.Minor, - cap.tpm_version_1_2.revMajor, - cap.tpm_version_1_2.revMinor); + if (!rc) { + str += sprintf(str, + "TCG version: %d.%d\nFirmware version: %d.%d\n", + cap.tpm_version_1_2.Major, + cap.tpm_version_1_2.Minor, + cap.tpm_version_1_2.revMajor, + cap.tpm_version_1_2.revMinor); + } else { + /* Otherwise just use TPM_STRUCT_VER */ + rc = tpm_getcap(dev, CAP_VERSION_1_1, &cap, + "attempting to determine the 1.1 version"); + if (rc) + return 0; + str += sprintf(str, + "TCG version: %d.%d\nFirmware version: %d.%d\n", + cap.tpm_version.Major, + cap.tpm_version.Minor, + cap.tpm_version.revMajor, + cap.tpm_version.revMinor); + } + return str - buf; } -EXPORT_SYMBOL_GPL(tpm_show_caps_1_2); +EXPORT_SYMBOL_GPL(tpm_show_caps); ssize_t tpm_show_durations(struct device *dev, struct device_attribute *attr, char *buf) @@ -1102,8 +1092,8 @@ ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr, } EXPORT_SYMBOL_GPL(tpm_store_cancel); -static bool wait_for_tpm_stat_cond(struct tpm_chip *chip, u8 mask, bool check_cancel, - bool *canceled) +static bool wait_for_tpm_stat_cond(struct tpm_chip *chip, u8 mask, + bool check_cancel, bool *canceled) { u8 status = chip->vendor.status(chip); @@ -1170,38 +1160,25 @@ EXPORT_SYMBOL_GPL(wait_for_tpm_stat); */ int tpm_open(struct inode *inode, struct file *file) { - int minor = iminor(inode); - struct tpm_chip *chip = NULL, *pos; - - rcu_read_lock(); - list_for_each_entry_rcu(pos, &tpm_chip_list, list) { - if (pos->vendor.miscdev.minor == minor) { - chip = pos; - get_device(chip->dev); - break; - } - } - rcu_read_unlock(); - - if (!chip) - return -ENODEV; + struct miscdevice *misc = file->private_data; + struct tpm_chip *chip = container_of(misc, struct tpm_chip, + vendor.miscdev); if (test_and_set_bit(0, &chip->is_open)) { dev_dbg(chip->dev, "Another process owns this TPM\n"); - put_device(chip->dev); return -EBUSY; } chip->data_buffer = kzalloc(TPM_BUFSIZE, GFP_KERNEL); if (chip->data_buffer == NULL) { clear_bit(0, &chip->is_open); - put_device(chip->dev); return -ENOMEM; } atomic_set(&chip->data_pending, 0); file->private_data = chip; + get_device(chip->dev); return 0; } EXPORT_SYMBOL_GPL(tpm_open); @@ -1463,7 +1440,6 @@ void tpm_dev_vendor_release(struct tpm_chip *chip) chip->vendor.release(chip->dev); clear_bit(chip->dev_num, dev_mask); - kfree(chip->vendor.miscdev.name); } EXPORT_SYMBOL_GPL(tpm_dev_vendor_release); @@ -1487,7 +1463,7 @@ void tpm_dev_release(struct device *dev) EXPORT_SYMBOL_GPL(tpm_dev_release); /* - * Called from tpm_<specific>.c probe function only for devices + * Called from tpm_<specific>.c probe function only for devices * the driver has determined it should claim. Prior to calling * this function the specific probe function has called pci_enable_device * upon errant exit from this function specific probe function should call @@ -1496,17 +1472,13 @@ EXPORT_SYMBOL_GPL(tpm_dev_release); struct tpm_chip *tpm_register_hardware(struct device *dev, const struct tpm_vendor_specific *entry) { -#define DEVNAME_SIZE 7 - - char *devname; struct tpm_chip *chip; /* Driver specific per-device data */ chip = kzalloc(sizeof(*chip), GFP_KERNEL); - devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL); - if (chip == NULL || devname == NULL) - goto out_free; + if (chip == NULL) + return NULL; mutex_init(&chip->buffer_mutex); mutex_init(&chip->tpm_mutex); @@ -1531,8 +1503,9 @@ struct tpm_chip *tpm_register_hardware(struct device *dev, set_bit(chip->dev_num, dev_mask); - scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num); - chip->vendor.miscdev.name = devname; + scnprintf(chip->devname, sizeof(chip->devname), "%s%d", "tpm", + chip->dev_num); + chip->vendor.miscdev.name = chip->devname; chip->vendor.miscdev.parent = dev; chip->dev = get_device(dev); @@ -1558,7 +1531,7 @@ struct tpm_chip *tpm_register_hardware(struct device *dev, goto put_device; } - chip->bios_dir = tpm_bios_log_setup(devname); + chip->bios_dir = tpm_bios_log_setup(chip->devname); /* Make chip available */ spin_lock(&driver_lock); @@ -1571,7 +1544,6 @@ put_device: put_device(chip->dev); out_free: kfree(chip); - kfree(devname); return NULL; } EXPORT_SYMBOL_GPL(tpm_register_hardware); diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h index a7bfc176ed43..f32847872193 100644 --- a/drivers/char/tpm/tpm.h +++ b/drivers/char/tpm/tpm.h @@ -59,8 +59,6 @@ extern ssize_t tpm_show_pcrs(struct device *, struct device_attribute *attr, char *); extern ssize_t tpm_show_caps(struct device *, struct device_attribute *attr, char *); -extern ssize_t tpm_show_caps_1_2(struct device *, struct device_attribute *attr, - char *); extern ssize_t tpm_store_cancel(struct device *, struct device_attribute *attr, const char *, size_t); extern ssize_t tpm_show_enabled(struct device *, struct device_attribute *attr, @@ -122,6 +120,7 @@ struct tpm_chip { struct device *dev; /* Device stuff */ int dev_num; /* /dev/tpm# */ + char devname[7]; unsigned long is_open; /* only one allowed */ int time_expired; diff --git a/drivers/char/tpm/tpm_atmel.c b/drivers/char/tpm/tpm_atmel.c index 99d6820c611d..c9a528d25d22 100644 --- a/drivers/char/tpm/tpm_atmel.c +++ b/drivers/char/tpm/tpm_atmel.c @@ -202,7 +202,7 @@ static int __init init_atmel(void) have_region = (atmel_request_region - (tpm_atmel.base, region_size, "tpm_atmel0") == NULL) ? 0 : 1; + (base, region_size, "tpm_atmel0") == NULL) ? 0 : 1; pdev = platform_device_register_simple("tpm_atmel", -1, NULL, 0); if (IS_ERR(pdev)) { diff --git a/drivers/char/tpm/tpm_eventlog.c b/drivers/char/tpm/tpm_eventlog.c index 84ddc557b8f8..59f7cb28260b 100644 --- a/drivers/char/tpm/tpm_eventlog.c +++ b/drivers/char/tpm/tpm_eventlog.c @@ -406,7 +406,6 @@ out_tpm: out: return NULL; } -EXPORT_SYMBOL_GPL(tpm_bios_log_setup); void tpm_bios_log_teardown(struct dentry **lst) { @@ -415,5 +414,3 @@ void tpm_bios_log_teardown(struct dentry **lst) for (i = 0; i < 3; i++) securityfs_remove(lst[i]); } -EXPORT_SYMBOL_GPL(tpm_bios_log_teardown); -MODULE_LICENSE("GPL"); diff --git a/drivers/char/tpm/tpm_i2c_atmel.c b/drivers/char/tpm/tpm_i2c_atmel.c new file mode 100644 index 000000000000..c3cd7fe481a1 --- /dev/null +++ b/drivers/char/tpm/tpm_i2c_atmel.c @@ -0,0 +1,284 @@ +/* + * ATMEL I2C TPM AT97SC3204T + * + * Copyright (C) 2012 V Lab Technologies + * Teddy Reed <teddy@prosauce.org> + * Copyright (C) 2013, Obsidian Research Corp. + * Jason Gunthorpe <jgunthorpe@obsidianresearch.com> + * Device driver for ATMEL I2C TPMs. + * + * Teddy Reed determined the basic I2C command flow, unlike other I2C TPM + * devices the raw TCG formatted TPM command data is written via I2C and then + * raw TCG formatted TPM command data is returned via I2C. + * + * TGC status/locality/etc functions seen in the LPC implementation do not + * seem to be present. + * + * 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, see http://www.gnu.org/licenses/>. + */ +#include <linux/init.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/slab.h> +#include <linux/i2c.h> +#include "tpm.h" + +#define I2C_DRIVER_NAME "tpm_i2c_atmel" + +#define TPM_I2C_SHORT_TIMEOUT 750 /* ms */ +#define TPM_I2C_LONG_TIMEOUT 2000 /* 2 sec */ + +#define ATMEL_STS_OK 1 + +struct priv_data { + size_t len; + /* This is the amount we read on the first try. 25 was chosen to fit a + * fair number of read responses in the buffer so a 2nd retry can be + * avoided in small message cases. */ + u8 buffer[sizeof(struct tpm_output_header) + 25]; +}; + +static int i2c_atmel_send(struct tpm_chip *chip, u8 *buf, size_t len) +{ + struct priv_data *priv = chip->vendor.priv; + struct i2c_client *client = to_i2c_client(chip->dev); + s32 status; + + priv->len = 0; + + if (len <= 2) + return -EIO; + + status = i2c_master_send(client, buf, len); + + dev_dbg(chip->dev, + "%s(buf=%*ph len=%0zx) -> sts=%d\n", __func__, + (int)min_t(size_t, 64, len), buf, len, status); + return status; +} + +static int i2c_atmel_recv(struct tpm_chip *chip, u8 *buf, size_t count) +{ + struct priv_data *priv = chip->vendor.priv; + struct i2c_client *client = to_i2c_client(chip->dev); + struct tpm_output_header *hdr = + (struct tpm_output_header *)priv->buffer; + u32 expected_len; + int rc; + + if (priv->len == 0) + return -EIO; + + /* Get the message size from the message header, if we didn't get the + * whole message in read_status then we need to re-read the + * message. */ + expected_len = be32_to_cpu(hdr->length); + if (expected_len > count) + return -ENOMEM; + + if (priv->len >= expected_len) { + dev_dbg(chip->dev, + "%s early(buf=%*ph count=%0zx) -> ret=%d\n", __func__, + (int)min_t(size_t, 64, expected_len), buf, count, + expected_len); + memcpy(buf, priv->buffer, expected_len); + return expected_len; + } + + rc = i2c_master_recv(client, buf, expected_len); + dev_dbg(chip->dev, + "%s reread(buf=%*ph count=%0zx) -> ret=%d\n", __func__, + (int)min_t(size_t, 64, expected_len), buf, count, + expected_len); + return rc; +} + +static void i2c_atmel_cancel(struct tpm_chip *chip) +{ + dev_err(chip->dev, "TPM operation cancellation was requested, but is not supported"); +} + +static u8 i2c_atmel_read_status(struct tpm_chip *chip) +{ + struct priv_data *priv = chip->vendor.priv; + struct i2c_client *client = to_i2c_client(chip->dev); + int rc; + + /* The TPM fails the I2C read until it is ready, so we do the entire + * transfer here and buffer it locally. This way the common code can + * properly handle the timeouts. */ + priv->len = 0; + memset(priv->buffer, 0, sizeof(priv->buffer)); + + + /* Once the TPM has completed the command the command remains readable + * until another command is issued. */ + rc = i2c_master_recv(client, priv->buffer, sizeof(priv->buffer)); + dev_dbg(chip->dev, + "%s: sts=%d", __func__, rc); + if (rc <= 0) + return 0; + + priv->len = rc; + + return ATMEL_STS_OK; +} + +static const struct file_operations i2c_atmel_ops = { + .owner = THIS_MODULE, + .llseek = no_llseek, + .open = tpm_open, + .read = tpm_read, + .write = tpm_write, + .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, NULL); +static DEVICE_ATTR(cancel, S_IWUSR | S_IWGRP, NULL, tpm_store_cancel); +static DEVICE_ATTR(durations, S_IRUGO, tpm_show_durations, NULL); +static DEVICE_ATTR(timeouts, S_IRUGO, tpm_show_timeouts, NULL); + +static struct attribute *i2c_atmel_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, + &dev_attr_durations.attr, + &dev_attr_timeouts.attr, + NULL, +}; + +static struct attribute_group i2c_atmel_attr_grp = { + .attrs = i2c_atmel_attrs +}; + +static bool i2c_atmel_req_canceled(struct tpm_chip *chip, u8 status) +{ + return 0; +} + +static const struct tpm_vendor_specific i2c_atmel = { + .status = i2c_atmel_read_status, + .recv = i2c_atmel_recv, + .send = i2c_atmel_send, + .cancel = i2c_atmel_cancel, + .req_complete_mask = ATMEL_STS_OK, + .req_complete_val = ATMEL_STS_OK, + .req_canceled = i2c_atmel_req_canceled, + .attr_group = &i2c_atmel_attr_grp, + .miscdev.fops = &i2c_atmel_ops, +}; + +static int i2c_atmel_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + int rc; + struct tpm_chip *chip; + struct device *dev = &client->dev; + + if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) + return -ENODEV; + + chip = tpm_register_hardware(dev, &i2c_atmel); + if (!chip) { + dev_err(dev, "%s() error in tpm_register_hardware\n", __func__); + return -ENODEV; + } + + chip->vendor.priv = devm_kzalloc(dev, sizeof(struct priv_data), + GFP_KERNEL); + + /* Default timeouts */ + chip->vendor.timeout_a = msecs_to_jiffies(TPM_I2C_SHORT_TIMEOUT); + chip->vendor.timeout_b = msecs_to_jiffies(TPM_I2C_LONG_TIMEOUT); + chip->vendor.timeout_c = msecs_to_jiffies(TPM_I2C_SHORT_TIMEOUT); + chip->vendor.timeout_d = msecs_to_jiffies(TPM_I2C_SHORT_TIMEOUT); + chip->vendor.irq = 0; + + /* There is no known way to probe for this device, and all version + * information seems to be read via TPM commands. Thus we rely on the + * TPM startup process in the common code to detect the device. */ + if (tpm_get_timeouts(chip)) { + rc = -ENODEV; + goto out_err; + } + + if (tpm_do_selftest(chip)) { + rc = -ENODEV; + goto out_err; + } + + return 0; + +out_err: + tpm_dev_vendor_release(chip); + tpm_remove_hardware(chip->dev); + return rc; +} + +static int i2c_atmel_remove(struct i2c_client *client) +{ + struct device *dev = &(client->dev); + struct tpm_chip *chip = dev_get_drvdata(dev); + + if (chip) + tpm_dev_vendor_release(chip); + tpm_remove_hardware(dev); + kfree(chip); + return 0; +} + +static const struct i2c_device_id i2c_atmel_id[] = { + {I2C_DRIVER_NAME, 0}, + {} +}; +MODULE_DEVICE_TABLE(i2c, i2c_atmel_id); + +#ifdef CONFIG_OF +static const struct of_device_id i2c_atmel_of_match[] = { + {.compatible = "atmel,at97sc3204t"}, + {}, +}; +MODULE_DEVICE_TABLE(of, i2c_atmel_of_match); +#endif + +static SIMPLE_DEV_PM_OPS(i2c_atmel_pm_ops, tpm_pm_suspend, tpm_pm_resume); + +static struct i2c_driver i2c_atmel_driver = { + .id_table = i2c_atmel_id, + .probe = i2c_atmel_probe, + .remove = i2c_atmel_remove, + .driver = { + .name = I2C_DRIVER_NAME, + .owner = THIS_MODULE, + .pm = &i2c_atmel_pm_ops, + .of_match_table = of_match_ptr(i2c_atmel_of_match), + }, +}; + +module_i2c_driver(i2c_atmel_driver); + +MODULE_AUTHOR("Jason Gunthorpe <jgunthorpe@obsidianresearch.com>"); +MODULE_DESCRIPTION("Atmel TPM I2C Driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/char/tpm/tpm_i2c_infineon.c b/drivers/char/tpm/tpm_i2c_infineon.c index b8735de8ce95..fefd2aa5c81e 100644 --- a/drivers/char/tpm/tpm_i2c_infineon.c +++ b/drivers/char/tpm/tpm_i2c_infineon.c @@ -581,7 +581,7 @@ 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(caps, S_IRUGO, tpm_show_caps, NULL); static DEVICE_ATTR(cancel, S_IWUSR | S_IWGRP, NULL, tpm_store_cancel); static DEVICE_ATTR(durations, S_IRUGO, tpm_show_durations, NULL); static DEVICE_ATTR(timeouts, S_IRUGO, tpm_show_timeouts, NULL); @@ -685,7 +685,6 @@ out_vendor: chip->dev->release = NULL; chip->release = NULL; tpm_dev.client = NULL; - dev_set_drvdata(chip->dev, chip); out_err: return rc; } @@ -766,7 +765,6 @@ static int tpm_tis_i2c_remove(struct i2c_client *client) chip->dev->release = NULL; chip->release = NULL; tpm_dev.client = NULL; - dev_set_drvdata(chip->dev, chip); return 0; } diff --git a/drivers/char/tpm/tpm_i2c_nuvoton.c b/drivers/char/tpm/tpm_i2c_nuvoton.c new file mode 100644 index 000000000000..6276fea01ff0 --- /dev/null +++ b/drivers/char/tpm/tpm_i2c_nuvoton.c @@ -0,0 +1,710 @@ +/****************************************************************************** + * Nuvoton TPM I2C Device Driver Interface for WPCT301/NPCT501, + * based on the TCG TPM Interface Spec version 1.2. + * Specifications at www.trustedcomputinggroup.org + * + * Copyright (C) 2011, Nuvoton Technology Corporation. + * Dan Morav <dan.morav@nuvoton.com> + * Copyright (C) 2013, Obsidian Research Corp. + * Jason Gunthorpe <jgunthorpe@obsidianresearch.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, see http://www.gnu.org/licenses/>. + * + * Nuvoton contact information: APC.Support@nuvoton.com + *****************************************************************************/ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/slab.h> +#include <linux/interrupt.h> +#include <linux/wait.h> +#include <linux/i2c.h> +#include "tpm.h" + +/* I2C interface offsets */ +#define TPM_STS 0x00 +#define TPM_BURST_COUNT 0x01 +#define TPM_DATA_FIFO_W 0x20 +#define TPM_DATA_FIFO_R 0x40 +#define TPM_VID_DID_RID 0x60 +/* TPM command header size */ +#define TPM_HEADER_SIZE 10 +#define TPM_RETRY 5 +/* + * I2C bus device maximum buffer size w/o counting I2C address or command + * i.e. max size required for I2C write is 34 = addr, command, 32 bytes data + */ +#define TPM_I2C_MAX_BUF_SIZE 32 +#define TPM_I2C_RETRY_COUNT 32 +#define TPM_I2C_BUS_DELAY 1 /* msec */ +#define TPM_I2C_RETRY_DELAY_SHORT 2 /* msec */ +#define TPM_I2C_RETRY_DELAY_LONG 10 /* msec */ + +#define I2C_DRIVER_NAME "tpm_i2c_nuvoton" + +struct priv_data { + unsigned int intrs; +}; + +static s32 i2c_nuvoton_read_buf(struct i2c_client *client, u8 offset, u8 size, + u8 *data) +{ + s32 status; + + status = i2c_smbus_read_i2c_block_data(client, offset, size, data); + dev_dbg(&client->dev, + "%s(offset=%u size=%u data=%*ph) -> sts=%d\n", __func__, + offset, size, (int)size, data, status); + return status; +} + +static s32 i2c_nuvoton_write_buf(struct i2c_client *client, u8 offset, u8 size, + u8 *data) +{ + s32 status; + + status = i2c_smbus_write_i2c_block_data(client, offset, size, data); + dev_dbg(&client->dev, + "%s(offset=%u size=%u data=%*ph) -> sts=%d\n", __func__, + offset, size, (int)size, data, status); + return status; +} + +#define TPM_STS_VALID 0x80 +#define TPM_STS_COMMAND_READY 0x40 +#define TPM_STS_GO 0x20 +#define TPM_STS_DATA_AVAIL 0x10 +#define TPM_STS_EXPECT 0x08 +#define TPM_STS_RESPONSE_RETRY 0x02 +#define TPM_STS_ERR_VAL 0x07 /* bit2...bit0 reads always 0 */ + +#define TPM_I2C_SHORT_TIMEOUT 750 /* ms */ +#define TPM_I2C_LONG_TIMEOUT 2000 /* 2 sec */ + +/* read TPM_STS register */ +static u8 i2c_nuvoton_read_status(struct tpm_chip *chip) +{ + struct i2c_client *client = to_i2c_client(chip->dev); + s32 status; + u8 data; + + status = i2c_nuvoton_read_buf(client, TPM_STS, 1, &data); + if (status <= 0) { + dev_err(chip->dev, "%s() error return %d\n", __func__, + status); + data = TPM_STS_ERR_VAL; + } + + return data; +} + +/* write byte to TPM_STS register */ +static s32 i2c_nuvoton_write_status(struct i2c_client *client, u8 data) +{ + s32 status; + int i; + + /* this causes the current command to be aborted */ + for (i = 0, status = -1; i < TPM_I2C_RETRY_COUNT && status < 0; i++) { + status = i2c_nuvoton_write_buf(client, TPM_STS, 1, &data); + msleep(TPM_I2C_BUS_DELAY); + } + return status; +} + +/* write commandReady to TPM_STS register */ +static void i2c_nuvoton_ready(struct tpm_chip *chip) +{ + struct i2c_client *client = to_i2c_client(chip->dev); + s32 status; + + /* this causes the current command to be aborted */ + status = i2c_nuvoton_write_status(client, TPM_STS_COMMAND_READY); + if (status < 0) + dev_err(chip->dev, + "%s() fail to write TPM_STS.commandReady\n", __func__); +} + +/* read burstCount field from TPM_STS register + * return -1 on fail to read */ +static int i2c_nuvoton_get_burstcount(struct i2c_client *client, + struct tpm_chip *chip) +{ + unsigned long stop = jiffies + chip->vendor.timeout_d; + s32 status; + int burst_count = -1; + u8 data; + + /* wait for burstcount to be non-zero */ + do { + /* in I2C burstCount is 1 byte */ + status = i2c_nuvoton_read_buf(client, TPM_BURST_COUNT, 1, + &data); + if (status > 0 && data > 0) { + burst_count = min_t(u8, TPM_I2C_MAX_BUF_SIZE, data); + break; + } + msleep(TPM_I2C_BUS_DELAY); + } while (time_before(jiffies, stop)); + + return burst_count; +} + +/* + * WPCT301/NPCT501 SINT# supports only dataAvail + * any call to this function which is not waiting for dataAvail will + * set queue to NULL to avoid waiting for interrupt + */ +static bool i2c_nuvoton_check_status(struct tpm_chip *chip, u8 mask, u8 value) +{ + u8 status = i2c_nuvoton_read_status(chip); + return (status != TPM_STS_ERR_VAL) && ((status & mask) == value); +} + +static int i2c_nuvoton_wait_for_stat(struct tpm_chip *chip, u8 mask, u8 value, + u32 timeout, wait_queue_head_t *queue) +{ + if (chip->vendor.irq && queue) { + s32 rc; + DEFINE_WAIT(wait); + struct priv_data *priv = chip->vendor.priv; + unsigned int cur_intrs = priv->intrs; + + enable_irq(chip->vendor.irq); + rc = wait_event_interruptible_timeout(*queue, + cur_intrs != priv->intrs, + timeout); + if (rc > 0) + return 0; + /* At this point we know that the SINT pin is asserted, so we + * do not need to do i2c_nuvoton_check_status */ + } else { + unsigned long ten_msec, stop; + bool status_valid; + + /* check current status */ + status_valid = i2c_nuvoton_check_status(chip, mask, value); + if (status_valid) + return 0; + + /* use polling to wait for the event */ + ten_msec = jiffies + msecs_to_jiffies(TPM_I2C_RETRY_DELAY_LONG); + stop = jiffies + timeout; + do { + if (time_before(jiffies, ten_msec)) + msleep(TPM_I2C_RETRY_DELAY_SHORT); + else + msleep(TPM_I2C_RETRY_DELAY_LONG); + status_valid = i2c_nuvoton_check_status(chip, mask, + value); + if (status_valid) + return 0; + } while (time_before(jiffies, stop)); + } + dev_err(chip->dev, "%s(%02x, %02x) -> timeout\n", __func__, mask, + value); + return -ETIMEDOUT; +} + +/* wait for dataAvail field to be set in the TPM_STS register */ +static int i2c_nuvoton_wait_for_data_avail(struct tpm_chip *chip, u32 timeout, + wait_queue_head_t *queue) +{ + return i2c_nuvoton_wait_for_stat(chip, + TPM_STS_DATA_AVAIL | TPM_STS_VALID, + TPM_STS_DATA_AVAIL | TPM_STS_VALID, + timeout, queue); +} + +/* Read @count bytes into @buf from TPM_RD_FIFO register */ +static int i2c_nuvoton_recv_data(struct i2c_client *client, + struct tpm_chip *chip, u8 *buf, size_t count) +{ + s32 rc; + int burst_count, bytes2read, size = 0; + + while (size < count && + i2c_nuvoton_wait_for_data_avail(chip, + chip->vendor.timeout_c, + &chip->vendor.read_queue) == 0) { + burst_count = i2c_nuvoton_get_burstcount(client, chip); + if (burst_count < 0) { + dev_err(chip->dev, + "%s() fail to read burstCount=%d\n", __func__, + burst_count); + return -EIO; + } + bytes2read = min_t(size_t, burst_count, count - size); + rc = i2c_nuvoton_read_buf(client, TPM_DATA_FIFO_R, + bytes2read, &buf[size]); + if (rc < 0) { + dev_err(chip->dev, + "%s() fail on i2c_nuvoton_read_buf()=%d\n", + __func__, rc); + return -EIO; + } + dev_dbg(chip->dev, "%s(%d):", __func__, bytes2read); + size += bytes2read; + } + + return size; +} + +/* Read TPM command results */ +static int i2c_nuvoton_recv(struct tpm_chip *chip, u8 *buf, size_t count) +{ + struct device *dev = chip->dev; + struct i2c_client *client = to_i2c_client(dev); + s32 rc; + int expected, status, burst_count, retries, size = 0; + + if (count < TPM_HEADER_SIZE) { + i2c_nuvoton_ready(chip); /* return to idle */ + dev_err(dev, "%s() count < header size\n", __func__); + return -EIO; + } + for (retries = 0; retries < TPM_RETRY; retries++) { + if (retries > 0) { + /* if this is not the first trial, set responseRetry */ + i2c_nuvoton_write_status(client, + TPM_STS_RESPONSE_RETRY); + } + /* + * read first available (> 10 bytes), including: + * tag, paramsize, and result + */ + status = i2c_nuvoton_wait_for_data_avail( + chip, chip->vendor.timeout_c, &chip->vendor.read_queue); + if (status != 0) { + dev_err(dev, "%s() timeout on dataAvail\n", __func__); + size = -ETIMEDOUT; + continue; + } + burst_count = i2c_nuvoton_get_burstcount(client, chip); + if (burst_count < 0) { + dev_err(dev, "%s() fail to get burstCount\n", __func__); + size = -EIO; + continue; + } + size = i2c_nuvoton_recv_data(client, chip, buf, + burst_count); + if (size < TPM_HEADER_SIZE) { + dev_err(dev, "%s() fail to read header\n", __func__); + size = -EIO; + continue; + } + /* + * convert number of expected bytes field from big endian 32 bit + * to machine native + */ + expected = be32_to_cpu(*(__be32 *) (buf + 2)); + if (expected > count) { + dev_err(dev, "%s() expected > count\n", __func__); + size = -EIO; + continue; + } + rc = i2c_nuvoton_recv_data(client, chip, &buf[size], + expected - size); + size += rc; + if (rc < 0 || size < expected) { + dev_err(dev, "%s() fail to read remainder of result\n", + __func__); + size = -EIO; + continue; + } + if (i2c_nuvoton_wait_for_stat( + chip, TPM_STS_VALID | TPM_STS_DATA_AVAIL, + TPM_STS_VALID, chip->vendor.timeout_c, + NULL)) { + dev_err(dev, "%s() error left over data\n", __func__); + size = -ETIMEDOUT; + continue; + } + break; + } + i2c_nuvoton_ready(chip); + dev_dbg(chip->dev, "%s() -> %d\n", __func__, size); + return size; +} + +/* + * Send TPM command. + * + * If interrupts are used (signaled by an irq set in the vendor structure) + * tpm.c can skip polling for the data to be available as the interrupt is + * waited for here + */ +static int i2c_nuvoton_send(struct tpm_chip *chip, u8 *buf, size_t len) +{ + struct device *dev = chip->dev; + struct i2c_client *client = to_i2c_client(dev); + u32 ordinal; + size_t count = 0; + int burst_count, bytes2write, retries, rc = -EIO; + + for (retries = 0; retries < TPM_RETRY; retries++) { + i2c_nuvoton_ready(chip); + if (i2c_nuvoton_wait_for_stat(chip, TPM_STS_COMMAND_READY, + TPM_STS_COMMAND_READY, + chip->vendor.timeout_b, NULL)) { + dev_err(dev, "%s() timeout on commandReady\n", + __func__); + rc = -EIO; + continue; + } + rc = 0; + while (count < len - 1) { + burst_count = i2c_nuvoton_get_burstcount(client, + chip); + if (burst_count < 0) { + dev_err(dev, "%s() fail get burstCount\n", + __func__); + rc = -EIO; + break; + } + bytes2write = min_t(size_t, burst_count, + len - 1 - count); + rc = i2c_nuvoton_write_buf(client, TPM_DATA_FIFO_W, + bytes2write, &buf[count]); + if (rc < 0) { + dev_err(dev, "%s() fail i2cWriteBuf\n", + __func__); + break; + } + dev_dbg(dev, "%s(%d):", __func__, bytes2write); + count += bytes2write; + rc = i2c_nuvoton_wait_for_stat(chip, + TPM_STS_VALID | + TPM_STS_EXPECT, + TPM_STS_VALID | + TPM_STS_EXPECT, + chip->vendor.timeout_c, + NULL); + if (rc < 0) { + dev_err(dev, "%s() timeout on Expect\n", + __func__); + rc = -ETIMEDOUT; + break; + } + } + if (rc < 0) + continue; + + /* write last byte */ + rc = i2c_nuvoton_write_buf(client, TPM_DATA_FIFO_W, 1, + &buf[count]); + if (rc < 0) { + dev_err(dev, "%s() fail to write last byte\n", + __func__); + rc = -EIO; + continue; + } + dev_dbg(dev, "%s(last): %02x", __func__, buf[count]); + rc = i2c_nuvoton_wait_for_stat(chip, + TPM_STS_VALID | TPM_STS_EXPECT, + TPM_STS_VALID, + chip->vendor.timeout_c, NULL); + if (rc) { + dev_err(dev, "%s() timeout on Expect to clear\n", + __func__); + rc = -ETIMEDOUT; + continue; + } + break; + } + if (rc < 0) { + /* retries == TPM_RETRY */ + i2c_nuvoton_ready(chip); + return rc; + } + /* execute the TPM command */ + rc = i2c_nuvoton_write_status(client, TPM_STS_GO); + if (rc < 0) { + dev_err(dev, "%s() fail to write Go\n", __func__); + i2c_nuvoton_ready(chip); + return rc; + } + ordinal = be32_to_cpu(*((__be32 *) (buf + 6))); + rc = i2c_nuvoton_wait_for_data_avail(chip, + tpm_calc_ordinal_duration(chip, + ordinal), + &chip->vendor.read_queue); + if (rc) { + dev_err(dev, "%s() timeout command duration\n", __func__); + i2c_nuvoton_ready(chip); + return rc; + } + + dev_dbg(dev, "%s() -> %zd\n", __func__, len); + return len; +} + +static bool i2c_nuvoton_req_canceled(struct tpm_chip *chip, u8 status) +{ + return (status == TPM_STS_COMMAND_READY); +} + +static const struct file_operations i2c_nuvoton_ops = { + .owner = THIS_MODULE, + .llseek = no_llseek, + .open = tpm_open, + .read = tpm_read, + .write = tpm_write, + .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, NULL); +static DEVICE_ATTR(cancel, S_IWUSR | S_IWGRP, NULL, tpm_store_cancel); +static DEVICE_ATTR(durations, S_IRUGO, tpm_show_durations, NULL); +static DEVICE_ATTR(timeouts, S_IRUGO, tpm_show_timeouts, NULL); + +static struct attribute *i2c_nuvoton_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, + &dev_attr_durations.attr, + &dev_attr_timeouts.attr, + NULL, +}; + +static struct attribute_group i2c_nuvoton_attr_grp = { + .attrs = i2c_nuvoton_attrs +}; + +static const struct tpm_vendor_specific tpm_i2c = { + .status = i2c_nuvoton_read_status, + .recv = i2c_nuvoton_recv, + .send = i2c_nuvoton_send, + .cancel = i2c_nuvoton_ready, + .req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID, + .req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID, + .req_canceled = i2c_nuvoton_req_canceled, + .attr_group = &i2c_nuvoton_attr_grp, + .miscdev.fops = &i2c_nuvoton_ops, +}; + +/* The only purpose for the handler is to signal to any waiting threads that + * the interrupt is currently being asserted. The driver does not do any + * processing triggered by interrupts, and the chip provides no way to mask at + * the source (plus that would be slow over I2C). Run the IRQ as a one-shot, + * this means it cannot be shared. */ +static irqreturn_t i2c_nuvoton_int_handler(int dummy, void *dev_id) +{ + struct tpm_chip *chip = dev_id; + struct priv_data *priv = chip->vendor.priv; + + priv->intrs++; + wake_up(&chip->vendor.read_queue); + disable_irq_nosync(chip->vendor.irq); + return IRQ_HANDLED; +} + +static int get_vid(struct i2c_client *client, u32 *res) +{ + static const u8 vid_did_rid_value[] = { 0x50, 0x10, 0xfe }; + u32 temp; + s32 rc; + + if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) + return -ENODEV; + rc = i2c_nuvoton_read_buf(client, TPM_VID_DID_RID, 4, (u8 *)&temp); + if (rc < 0) + return rc; + + /* check WPCT301 values - ignore RID */ + if (memcmp(&temp, vid_did_rid_value, sizeof(vid_did_rid_value))) { + /* + * f/w rev 2.81 has an issue where the VID_DID_RID is not + * reporting the right value. so give it another chance at + * offset 0x20 (FIFO_W). + */ + rc = i2c_nuvoton_read_buf(client, TPM_DATA_FIFO_W, 4, + (u8 *) (&temp)); + if (rc < 0) + return rc; + + /* check WPCT301 values - ignore RID */ + if (memcmp(&temp, vid_did_rid_value, + sizeof(vid_did_rid_value))) + return -ENODEV; + } + + *res = temp; + return 0; +} + +static int i2c_nuvoton_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + int rc; + struct tpm_chip *chip; + struct device *dev = &client->dev; + u32 vid = 0; + + rc = get_vid(client, &vid); + if (rc) + return rc; + + dev_info(dev, "VID: %04X DID: %02X RID: %02X\n", (u16) vid, + (u8) (vid >> 16), (u8) (vid >> 24)); + + chip = tpm_register_hardware(dev, &tpm_i2c); + if (!chip) { + dev_err(dev, "%s() error in tpm_register_hardware\n", __func__); + return -ENODEV; + } + + chip->vendor.priv = devm_kzalloc(dev, sizeof(struct priv_data), + GFP_KERNEL); + init_waitqueue_head(&chip->vendor.read_queue); + init_waitqueue_head(&chip->vendor.int_queue); + + /* Default timeouts */ + chip->vendor.timeout_a = msecs_to_jiffies(TPM_I2C_SHORT_TIMEOUT); + chip->vendor.timeout_b = msecs_to_jiffies(TPM_I2C_LONG_TIMEOUT); + chip->vendor.timeout_c = msecs_to_jiffies(TPM_I2C_SHORT_TIMEOUT); + chip->vendor.timeout_d = msecs_to_jiffies(TPM_I2C_SHORT_TIMEOUT); + + /* + * I2C intfcaps (interrupt capabilitieis) in the chip are hard coded to: + * TPM_INTF_INT_LEVEL_LOW | TPM_INTF_DATA_AVAIL_INT + * The IRQ should be set in the i2c_board_info (which is done + * automatically in of_i2c_register_devices, for device tree users */ + chip->vendor.irq = client->irq; + + if (chip->vendor.irq) { + dev_dbg(dev, "%s() chip-vendor.irq\n", __func__); + rc = devm_request_irq(dev, chip->vendor.irq, + i2c_nuvoton_int_handler, + IRQF_TRIGGER_LOW, + chip->vendor.miscdev.name, + chip); + if (rc) { + dev_err(dev, "%s() Unable to request irq: %d for use\n", + __func__, chip->vendor.irq); + chip->vendor.irq = 0; + } else { + /* Clear any pending interrupt */ + i2c_nuvoton_ready(chip); + /* - wait for TPM_STS==0xA0 (stsValid, commandReady) */ + rc = i2c_nuvoton_wait_for_stat(chip, + TPM_STS_COMMAND_READY, + TPM_STS_COMMAND_READY, + chip->vendor.timeout_b, + NULL); + if (rc == 0) { + /* + * TIS is in ready state + * write dummy byte to enter reception state + * TPM_DATA_FIFO_W <- rc (0) + */ + rc = i2c_nuvoton_write_buf(client, + TPM_DATA_FIFO_W, + 1, (u8 *) (&rc)); + if (rc < 0) + goto out_err; + /* TPM_STS <- 0x40 (commandReady) */ + i2c_nuvoton_ready(chip); + } else { + /* + * timeout_b reached - command was + * aborted. TIS should now be in idle state - + * only TPM_STS_VALID should be set + */ + if (i2c_nuvoton_read_status(chip) != + TPM_STS_VALID) { + rc = -EIO; + goto out_err; + } + } + } + } + + if (tpm_get_timeouts(chip)) { + rc = -ENODEV; + goto out_err; + } + + if (tpm_do_selftest(chip)) { + rc = -ENODEV; + goto out_err; + } + + return 0; + +out_err: + tpm_dev_vendor_release(chip); + tpm_remove_hardware(chip->dev); + return rc; +} + +static int i2c_nuvoton_remove(struct i2c_client *client) +{ + struct device *dev = &(client->dev); + struct tpm_chip *chip = dev_get_drvdata(dev); + + if (chip) + tpm_dev_vendor_release(chip); + tpm_remove_hardware(dev); + kfree(chip); + return 0; +} + + +static const struct i2c_device_id i2c_nuvoton_id[] = { + {I2C_DRIVER_NAME, 0}, + {} +}; +MODULE_DEVICE_TABLE(i2c, i2c_nuvoton_id); + +#ifdef CONFIG_OF +static const struct of_device_id i2c_nuvoton_of_match[] = { + {.compatible = "nuvoton,npct501"}, + {.compatible = "winbond,wpct301"}, + {}, +}; +MODULE_DEVICE_TABLE(of, i2c_nuvoton_of_match); +#endif + +static SIMPLE_DEV_PM_OPS(i2c_nuvoton_pm_ops, tpm_pm_suspend, tpm_pm_resume); + +static struct i2c_driver i2c_nuvoton_driver = { + .id_table = i2c_nuvoton_id, + .probe = i2c_nuvoton_probe, + .remove = i2c_nuvoton_remove, + .driver = { + .name = I2C_DRIVER_NAME, + .owner = THIS_MODULE, + .pm = &i2c_nuvoton_pm_ops, + .of_match_table = of_match_ptr(i2c_nuvoton_of_match), + }, +}; + +module_i2c_driver(i2c_nuvoton_driver); + +MODULE_AUTHOR("Dan Morav (dan.morav@nuvoton.com)"); +MODULE_DESCRIPTION("Nuvoton TPM I2C Driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/char/tpm/tpm_i2c_stm_st33.c b/drivers/char/tpm/tpm_i2c_stm_st33.c index 5bb8e2ddd3b3..a0d6ceb5d005 100644 --- a/drivers/char/tpm/tpm_i2c_stm_st33.c +++ b/drivers/char/tpm/tpm_i2c_stm_st33.c @@ -584,7 +584,7 @@ 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(caps, S_IRUGO, tpm_show_caps, NULL); static DEVICE_ATTR(cancel, S_IWUSR | S_IWGRP, NULL, tpm_store_cancel); static struct attribute *stm_tpm_attrs[] = { @@ -746,8 +746,6 @@ tpm_st33_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id) tpm_get_timeouts(chip); - i2c_set_clientdata(client, chip); - dev_info(chip->dev, "TPM I2C Initialized\n"); return 0; _irq_set: @@ -807,24 +805,18 @@ static int tpm_st33_i2c_remove(struct i2c_client *client) #ifdef CONFIG_PM_SLEEP /* * tpm_st33_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_st33_i2c_pm_suspend(struct device *dev) { - struct tpm_chip *chip = dev_get_drvdata(dev); struct st33zp24_platform_data *pin_infos = dev->platform_data; int ret = 0; if (power_mgt) { gpio_set_value(pin_infos->io_lpcpd, 0); } else { - if (chip->data_buffer == NULL) - chip->data_buffer = pin_infos->tpm_i2c_buffer[0]; ret = tpm_pm_suspend(dev); } return ret; @@ -849,8 +841,6 @@ static int tpm_st33_i2c_pm_resume(struct device *dev) TPM_STS_VALID) == TPM_STS_VALID, chip->vendor.timeout_b); } else { - if (chip->data_buffer == NULL) - chip->data_buffer = pin_infos->tpm_i2c_buffer[0]; ret = tpm_pm_resume(dev); if (!ret) tpm_do_selftest(chip); diff --git a/drivers/char/tpm/tpm_ibmvtpm.c b/drivers/char/tpm/tpm_ibmvtpm.c index 56b07c35a13e..2783a42aa732 100644 --- a/drivers/char/tpm/tpm_ibmvtpm.c +++ b/drivers/char/tpm/tpm_ibmvtpm.c @@ -98,7 +98,7 @@ static int tpm_ibmvtpm_recv(struct tpm_chip *chip, u8 *buf, size_t count) if (count < len) { dev_err(ibmvtpm->dev, - "Invalid size in recv: count=%ld, crq_size=%d\n", + "Invalid size in recv: count=%zd, crq_size=%d\n", count, len); return -EIO; } @@ -136,7 +136,7 @@ static int tpm_ibmvtpm_send(struct tpm_chip *chip, u8 *buf, size_t count) if (count > ibmvtpm->rtce_size) { dev_err(ibmvtpm->dev, - "Invalid size in send: count=%ld, rtce_size=%d\n", + "Invalid size in send: count=%zd, rtce_size=%d\n", count, ibmvtpm->rtce_size); return -EIO; } @@ -419,7 +419,7 @@ 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(caps, S_IRUGO, tpm_show_caps, NULL); static DEVICE_ATTR(cancel, S_IWUSR | S_IWGRP, NULL, tpm_store_cancel); static DEVICE_ATTR(durations, S_IRUGO, tpm_show_durations, NULL); static DEVICE_ATTR(timeouts, S_IRUGO, tpm_show_timeouts, NULL); diff --git a/drivers/char/tpm/tpm_ppi.c b/drivers/char/tpm/tpm_ppi.c index 2168d15bc728..8e562dc65601 100644 --- a/drivers/char/tpm/tpm_ppi.c +++ b/drivers/char/tpm/tpm_ppi.c @@ -452,12 +452,8 @@ int tpm_add_ppi(struct kobject *parent) { return sysfs_create_group(parent, &ppi_attr_grp); } -EXPORT_SYMBOL_GPL(tpm_add_ppi); void tpm_remove_ppi(struct kobject *parent) { sysfs_remove_group(parent, &ppi_attr_grp); } -EXPORT_SYMBOL_GPL(tpm_remove_ppi); - -MODULE_LICENSE("GPL"); diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c index 5796d0157ce0..1b74459c0723 100644 --- a/drivers/char/tpm/tpm_tis.c +++ b/drivers/char/tpm/tpm_tis.c @@ -448,7 +448,7 @@ 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(caps, S_IRUGO, tpm_show_caps, NULL); static DEVICE_ATTR(cancel, S_IWUSR | S_IWGRP, NULL, tpm_store_cancel); static DEVICE_ATTR(durations, S_IRUGO, tpm_show_durations, NULL); static DEVICE_ATTR(timeouts, S_IRUGO, tpm_show_timeouts, NULL); diff --git a/drivers/char/tpm/xen-tpmfront.c b/drivers/char/tpm/xen-tpmfront.c index 94c280d36e8b..c8ff4df81779 100644 --- a/drivers/char/tpm/xen-tpmfront.c +++ b/drivers/char/tpm/xen-tpmfront.c @@ -351,8 +351,6 @@ static int tpmfront_probe(struct xenbus_device *dev, tpm_get_timeouts(priv->chip); - dev_set_drvdata(&dev->dev, priv->chip); - return rv; } |