tpm: Pull everything related to /dev/tpmX into tpm-dev.c
CLASS-dev.c is a common idiom for Linux subsystems
This pulls all the code related to the miscdev into tpm-dev.c and makes it
static. The identical file_operation structs in the drivers are purged and the
tpm common code unconditionally creates the miscdev.
Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Reviewed-by: Joel Schopp <jschopp@linux.vnet.ibm.com>
Reviewed-by: Ashley Lai <adlai@linux.vnet.ibm.com>
[phuewe:
tpm_dev_release is now used only in this file, thus the EXPORT_SYMBOL
can be dropped and the function be marked as static.
It has no other in-kernel users]
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 6ae41d3..0b9e9ca 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -312,23 +312,6 @@
TPM_MEDIUM,
};
-static void user_reader_timeout(unsigned long ptr)
-{
- struct tpm_chip *chip = (struct tpm_chip *) ptr;
-
- schedule_work(&chip->work);
-}
-
-static void timeout_work(struct work_struct *work)
-{
- struct tpm_chip *chip = container_of(work, struct tpm_chip, work);
-
- mutex_lock(&chip->buffer_mutex);
- atomic_set(&chip->data_pending, 0);
- memset(chip->data_buffer, 0, TPM_BUFSIZE);
- mutex_unlock(&chip->buffer_mutex);
-}
-
/*
* Returns max number of jiffies to wait
*/
@@ -355,8 +338,8 @@
/*
* Internal kernel interface to transmit TPM commands
*/
-static ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
- size_t bufsiz)
+ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
+ size_t bufsiz)
{
ssize_t rc;
u32 count, ordinal;
@@ -1151,127 +1134,6 @@
return -ETIME;
}
EXPORT_SYMBOL_GPL(wait_for_tpm_stat);
-/*
- * Device file system interface to the TPM
- *
- * It's assured that the chip will be opened just once,
- * by the check of is_open variable, which is protected
- * by driver_lock.
- */
-int tpm_open(struct inode *inode, struct file *file)
-{
- 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");
- return -EBUSY;
- }
-
- chip->data_buffer = kzalloc(TPM_BUFSIZE, GFP_KERNEL);
- if (chip->data_buffer == NULL) {
- clear_bit(0, &chip->is_open);
- return -ENOMEM;
- }
-
- atomic_set(&chip->data_pending, 0);
-
- file->private_data = chip;
- get_device(chip->dev);
- return 0;
-}
-EXPORT_SYMBOL_GPL(tpm_open);
-
-/*
- * Called on file close
- */
-int tpm_release(struct inode *inode, struct file *file)
-{
- struct tpm_chip *chip = file->private_data;
-
- del_singleshot_timer_sync(&chip->user_read_timer);
- flush_work(&chip->work);
- file->private_data = NULL;
- atomic_set(&chip->data_pending, 0);
- kzfree(chip->data_buffer);
- clear_bit(0, &chip->is_open);
- put_device(chip->dev);
- return 0;
-}
-EXPORT_SYMBOL_GPL(tpm_release);
-
-ssize_t tpm_write(struct file *file, const char __user *buf,
- size_t size, loff_t *off)
-{
- struct tpm_chip *chip = file->private_data;
- size_t in_size = size;
- ssize_t out_size;
-
- /* cannot perform a write until the read has cleared
- either via tpm_read or a user_read_timer timeout.
- This also prevents splitted buffered writes from blocking here.
- */
- if (atomic_read(&chip->data_pending) != 0)
- return -EBUSY;
-
- if (in_size > TPM_BUFSIZE)
- return -E2BIG;
-
- mutex_lock(&chip->buffer_mutex);
-
- if (copy_from_user
- (chip->data_buffer, (void __user *) buf, in_size)) {
- mutex_unlock(&chip->buffer_mutex);
- return -EFAULT;
- }
-
- /* atomic tpm command send and result receive */
- out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE);
- if (out_size < 0) {
- mutex_unlock(&chip->buffer_mutex);
- return out_size;
- }
-
- atomic_set(&chip->data_pending, out_size);
- mutex_unlock(&chip->buffer_mutex);
-
- /* Set a timeout by which the reader must come claim the result */
- mod_timer(&chip->user_read_timer, jiffies + (60 * HZ));
-
- return in_size;
-}
-EXPORT_SYMBOL_GPL(tpm_write);
-
-ssize_t tpm_read(struct file *file, char __user *buf,
- size_t size, loff_t *off)
-{
- struct tpm_chip *chip = file->private_data;
- ssize_t ret_size;
- int rc;
-
- del_singleshot_timer_sync(&chip->user_read_timer);
- flush_work(&chip->work);
- ret_size = atomic_read(&chip->data_pending);
- if (ret_size > 0) { /* relay data */
- ssize_t orig_ret_size = ret_size;
- if (size < ret_size)
- ret_size = size;
-
- mutex_lock(&chip->buffer_mutex);
- rc = copy_to_user(buf, chip->data_buffer, ret_size);
- memset(chip->data_buffer, 0, orig_ret_size);
- if (rc)
- ret_size = -EFAULT;
-
- mutex_unlock(&chip->buffer_mutex);
- }
-
- atomic_set(&chip->data_pending, 0);
-
- return ret_size;
-}
-EXPORT_SYMBOL_GPL(tpm_read);
void tpm_remove_hardware(struct device *dev)
{
@@ -1287,7 +1149,7 @@
spin_unlock(&driver_lock);
synchronize_rcu();
- misc_deregister(&chip->vendor.miscdev);
+ tpm_dev_del_device(chip);
sysfs_remove_group(&dev->kobj, chip->vendor.attr_group);
tpm_remove_ppi(&dev->kobj);
tpm_bios_log_teardown(chip->bios_dir);
@@ -1448,7 +1310,7 @@
* Once all references to platform device are down to 0,
* release all allocated structures.
*/
-void tpm_dev_release(struct device *dev)
+static void tpm_dev_release(struct device *dev)
{
struct tpm_chip *chip = dev_get_drvdata(dev);
@@ -1460,7 +1322,6 @@
chip->release(dev);
kfree(chip);
}
-EXPORT_SYMBOL_GPL(tpm_dev_release);
/*
* Called from tpm_<specific>.c probe function only for devices
@@ -1480,15 +1341,9 @@
if (chip == NULL)
return NULL;
- mutex_init(&chip->buffer_mutex);
mutex_init(&chip->tpm_mutex);
INIT_LIST_HEAD(&chip->list);
- INIT_WORK(&chip->work, timeout_work);
-
- setup_timer(&chip->user_read_timer, user_reader_timeout,
- (unsigned long)chip);
-
memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific));
chip->dev_num = find_first_zero_bit(dev_mask, TPM_NUM_DEVICES);
@@ -1496,40 +1351,26 @@
if (chip->dev_num >= TPM_NUM_DEVICES) {
dev_err(dev, "No available tpm device numbers\n");
goto out_free;
- } else if (chip->dev_num == 0)
- chip->vendor.miscdev.minor = TPM_MINOR;
- else
- chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR;
+ }
set_bit(chip->dev_num, dev_mask);
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);
chip->release = dev->release;
dev->release = tpm_dev_release;
dev_set_drvdata(dev, chip);
- if (misc_register(&chip->vendor.miscdev)) {
- dev_err(chip->dev,
- "unable to misc_register %s, minor %d\n",
- chip->vendor.miscdev.name,
- chip->vendor.miscdev.minor);
+ if (tpm_dev_add_device(chip))
goto put_device;
- }
- if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group)) {
- misc_deregister(&chip->vendor.miscdev);
- goto put_device;
- }
+ if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group))
+ goto del_misc;
- if (tpm_add_ppi(&dev->kobj)) {
- misc_deregister(&chip->vendor.miscdev);
- goto put_device;
- }
+ if (tpm_add_ppi(&dev->kobj))
+ goto del_misc;
chip->bios_dir = tpm_bios_log_setup(chip->devname);
@@ -1540,6 +1381,8 @@
return chip;
+del_misc:
+ tpm_dev_del_device(chip);
put_device:
put_device(chip->dev);
out_free: