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    Subject[PATCH v10 5/8] tpm: device class for tpm
    Date
    Added own device class for TPM. Uses MISC_MAJOR:TPM_MINOR for the
    first character device in order to retain backwards compatibility.
    Added tpm_dev_release() back attached to the character device.

    I've been running this code now for a while on my laptop (Lenovo
    T430S) TrouSerS works perfectly without modifications. I don't
    believe it breaks anything significantly.

    The sysfs attributes that have been placed under the wrong place
    and are against sysfs-rules.txt should be probably left to
    stagnate under platform device directory and start defining
    new sysfs attributes to the char device directory.

    Guidelines for future TPM sysfs attributes should be probably
    along the lines of

    - Single flat set of mandatory sysfs attributes. For example,
    current PPI interface is way way too rich when you only want
    to use it to clear and activate the TPM.

    - Define sysfs attribute if and only if there's no way to get
    the value from ring-3. No attributes for TPM properties. It's
    just unnecessary maintenance hurdle that we don't want.

    Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
    Reviewed-by: Jasob Gunthorpe <jason.gunthorpe@obsidianresearch.com>
    Reviewed-by: Stephan Berger <stephan.berger@linux.vnet.ibm.com>
    ---
    Documentation/ABI/stable/sysfs-class-tpm | 22 +++++-----
    drivers/char/tpm/tpm-chip.c | 72 +++++++++++++++++++++++++++-----
    drivers/char/tpm/tpm-dev.c | 36 ++--------------
    drivers/char/tpm/tpm-interface.c | 29 +++++++++++++
    drivers/char/tpm/tpm.h | 12 ++++--
    drivers/char/tpm/tpm_i2c_nuvoton.c | 2 +-
    drivers/char/tpm/tpm_tis.c | 4 +-
    7 files changed, 116 insertions(+), 61 deletions(-)

    diff --git a/Documentation/ABI/stable/sysfs-class-tpm b/Documentation/ABI/stable/sysfs-class-tpm
    index a60b45e..9f790ee 100644
    --- a/Documentation/ABI/stable/sysfs-class-tpm
    +++ b/Documentation/ABI/stable/sysfs-class-tpm
    @@ -1,4 +1,4 @@
    -What: /sys/class/misc/tpmX/device/
    +What: /sys/class/tpm/tpmX/device/
    Date: April 2005
    KernelVersion: 2.6.12
    Contact: tpmdd-devel@lists.sf.net
    @@ -6,7 +6,7 @@ Description: The device/ directory under a specific TPM instance exposes
    the properties of that TPM chip


    -What: /sys/class/misc/tpmX/device/active
    +What: /sys/class/tpm/tpmX/device/active
    Date: April 2006
    KernelVersion: 2.6.17
    Contact: tpmdd-devel@lists.sf.net
    @@ -18,7 +18,7 @@ Description: The "active" property prints a '1' if the TPM chip is accepting
    section 17 for more information on which commands are
    available.

    -What: /sys/class/misc/tpmX/device/cancel
    +What: /sys/class/tpm/tpmX/device/cancel
    Date: June 2005
    KernelVersion: 2.6.13
    Contact: tpmdd-devel@lists.sf.net
    @@ -26,7 +26,7 @@ Description: The "cancel" property allows you to cancel the currently
    pending TPM command. Writing any value to cancel will call the
    TPM vendor specific cancel operation.

    -What: /sys/class/misc/tpmX/device/caps
    +What: /sys/class/tpm/tpmX/device/caps
    Date: April 2005
    KernelVersion: 2.6.12
    Contact: tpmdd-devel@lists.sf.net
    @@ -43,7 +43,7 @@ Description: The "caps" property contains TPM manufacturer and version info.
    the chip supports. Firmware version is that of the chip and
    is manufacturer specific.

    -What: /sys/class/misc/tpmX/device/durations
    +What: /sys/class/tpm/tpmX/device/durations
    Date: March 2011
    KernelVersion: 3.1
    Contact: tpmdd-devel@lists.sf.net
    @@ -66,7 +66,7 @@ Description: The "durations" property shows the 3 vendor-specific values
    scaled to be displayed in usecs. In this case "[adjusted]"
    will be displayed in place of "[original]".

    -What: /sys/class/misc/tpmX/device/enabled
    +What: /sys/class/tpm/tpmX/device/enabled
    Date: April 2006
    KernelVersion: 2.6.17
    Contact: tpmdd-devel@lists.sf.net
    @@ -75,7 +75,7 @@ Description: The "enabled" property prints a '1' if the TPM chip is enabled,
    may be visible but produce a '0' after some operation that
    disables the TPM.

    -What: /sys/class/misc/tpmX/device/owned
    +What: /sys/class/tpm/tpmX/device/owned
    Date: April 2006
    KernelVersion: 2.6.17
    Contact: tpmdd-devel@lists.sf.net
    @@ -83,7 +83,7 @@ Description: The "owned" property produces a '1' if the TPM_TakeOwnership
    ordinal has been executed successfully in the chip. A '0'
    indicates that ownership hasn't been taken.

    -What: /sys/class/misc/tpmX/device/pcrs
    +What: /sys/class/tpm/tpmX/device/pcrs
    Date: April 2005
    KernelVersion: 2.6.12
    Contact: tpmdd-devel@lists.sf.net
    @@ -106,7 +106,7 @@ Description: The "pcrs" property will dump the current value of all Platform
    1.2 chips, PCRs represent SHA-1 hashes, which are 20 bytes
    long. Use the "caps" property to determine TPM version.

    -What: /sys/class/misc/tpmX/device/pubek
    +What: /sys/class/tpm/tpmX/device/pubek
    Date: April 2005
    KernelVersion: 2.6.12
    Contact: tpmdd-devel@lists.sf.net
    @@ -158,7 +158,7 @@ Description: The "pubek" property will return the TPM's public endorsement
    Modulus Length: 256 (bytes)
    Modulus: The 256 byte Endorsement Key modulus

    -What: /sys/class/misc/tpmX/device/temp_deactivated
    +What: /sys/class/tpm/tpmX/device/temp_deactivated
    Date: April 2006
    KernelVersion: 2.6.17
    Contact: tpmdd-devel@lists.sf.net
    @@ -167,7 +167,7 @@ Description: The "temp_deactivated" property returns a '1' if the chip has
    cycle. Whether a warm boot (reboot) will clear a TPM chip
    from a temp_deactivated state is platform specific.

    -What: /sys/class/misc/tpmX/device/timeouts
    +What: /sys/class/tpm/tpmX/device/timeouts
    Date: March 2011
    KernelVersion: 3.1
    Contact: tpmdd-devel@lists.sf.net
    diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
    index e72b042..7596eef 100644
    --- a/drivers/char/tpm/tpm-chip.c
    +++ b/drivers/char/tpm/tpm-chip.c
    @@ -25,6 +25,7 @@
    #include <linux/mutex.h>
    #include <linux/spinlock.h>
    #include <linux/freezer.h>
    +#include <linux/major.h>
    #include "tpm.h"
    #include "tpm_eventlog.h"

    @@ -32,6 +33,9 @@ static DECLARE_BITMAP(dev_mask, TPM_NUM_DEVICES);
    static LIST_HEAD(tpm_chip_list);
    static DEFINE_SPINLOCK(driver_lock);

    +struct class *tpm_class;
    +dev_t tpm_devt;
    +
    /*
    * tpm_chip_find_get - return tpm_chip for a given chip number
    * @chip_num the device number for the chip
    @@ -55,16 +59,14 @@ struct tpm_chip *tpm_chip_find_get(int chip_num)
    }

    /**
    - * tpmm_chip_remove() - free chip memory and device number
    - * @data: points to struct tpm_chip instance
    + * tpm_dev_release() - free chip memory and the device number
    + * @dev: the character device for the TPM chip
    *
    - * This is used internally by tpmm_chip_alloc() and called by devres
    - * when the device is released. This function does the opposite of
    - * tpmm_chip_alloc() freeing memory and the device number.
    + * This is used as the release function for the character device.
    */
    -static void tpmm_chip_remove(void *data)
    +static void tpm_dev_release(struct device *dev)
    {
    - struct tpm_chip *chip = (struct tpm_chip *) data;
    + struct tpm_chip *chip = container_of(dev, struct tpm_chip, dev);

    spin_lock(&driver_lock);
    clear_bit(chip->dev_num, dev_mask);
    @@ -111,18 +113,68 @@ struct tpm_chip *tpmm_chip_alloc(struct device *dev,
    scnprintf(chip->devname, sizeof(chip->devname), "tpm%d", chip->dev_num);

    chip->pdev = dev;
    - devm_add_action(dev, tpmm_chip_remove, chip);
    +
    dev_set_drvdata(dev, chip);

    + chip->dev.class = tpm_class;
    + chip->dev.release = tpm_dev_release;
    + chip->dev.parent = chip->pdev;
    +
    + if (chip->dev_num == 0)
    + chip->dev.devt = MKDEV(MISC_MAJOR, TPM_MINOR);
    + else
    + chip->dev.devt = MKDEV(MAJOR(tpm_devt), chip->dev_num);
    +
    + dev_set_name(&chip->dev, chip->devname);
    +
    + device_initialize(&chip->dev);
    +
    + chip->cdev.owner = chip->pdev->driver->owner;
    + cdev_init(&chip->cdev, &tpm_fops);
    +
    return chip;
    }
    EXPORT_SYMBOL_GPL(tpmm_chip_alloc);

    +static int tpm_dev_add_device(struct tpm_chip *chip)
    +{
    + int rc;
    +
    + rc = device_add(&chip->dev);
    + if (rc) {
    + dev_err(&chip->dev,
    + "unable to device_register() %s, major %d, minor %d, err=%d\n",
    + chip->devname, MAJOR(chip->dev.devt),
    + MINOR(chip->dev.devt), rc);
    +
    + return rc;
    + }
    +
    + rc = cdev_add(&chip->cdev, chip->dev.devt, 1);
    + if (rc) {
    + dev_err(&chip->dev,
    + "unable to cdev_add() %s, major %d, minor %d, err=%d\n",
    + chip->devname, MAJOR(chip->dev.devt),
    + MINOR(chip->dev.devt), rc);
    +
    + device_unregister(&chip->dev);
    + return rc;
    + }
    +
    + return rc;
    +}
    +
    +static void tpm_dev_del_device(struct tpm_chip *chip)
    +{
    + cdev_del(&chip->cdev);
    + device_unregister(&chip->dev);
    +}
    +
    /*
    - * tpm_chip_register() - create a misc driver for the TPM chip
    + * tpm_chip_register() - create a character device for the TPM chip
    * @chip: TPM chip to use.
    *
    - * Creates a misc driver for the TPM chip and adds sysfs interfaces for
    + * Creates a character device for the TPM chip and adds sysfs interfaces for
    * the device, PPI and TCPA. As the last step this function adds the
    * chip to the list of TPM chips available for use.
    *
    diff --git a/drivers/char/tpm/tpm-dev.c b/drivers/char/tpm/tpm-dev.c
    index 3568321..de0337e 100644
    --- a/drivers/char/tpm/tpm-dev.c
    +++ b/drivers/char/tpm/tpm-dev.c
    @@ -17,7 +17,6 @@
    * License.
    *
    */
    -#include <linux/miscdevice.h>
    #include <linux/slab.h>
    #include <linux/uaccess.h>
    #include "tpm.h"
    @@ -54,9 +53,8 @@ static void timeout_work(struct work_struct *work)

    static 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);
    + struct tpm_chip *chip =
    + container_of(inode->i_cdev, struct tpm_chip, cdev);
    struct file_priv *priv;

    /* It's assured that the chip will be opened just once,
    @@ -173,7 +171,7 @@ static int tpm_release(struct inode *inode, struct file *file)
    return 0;
    }

    -static const struct file_operations tpm_fops = {
    +const struct file_operations tpm_fops = {
    .owner = THIS_MODULE,
    .llseek = no_llseek,
    .open = tpm_open,
    @@ -182,32 +180,4 @@ static const struct file_operations tpm_fops = {
    .release = tpm_release,
    };

    -int tpm_dev_add_device(struct tpm_chip *chip)
    -{
    - int rc;

    - chip->vendor.miscdev.fops = &tpm_fops;
    - if (chip->dev_num == 0)
    - chip->vendor.miscdev.minor = TPM_MINOR;
    - else
    - chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR;
    -
    - chip->vendor.miscdev.name = chip->devname;
    - chip->vendor.miscdev.parent = chip->pdev;
    -
    - rc = misc_register(&chip->vendor.miscdev);
    - if (rc) {
    - chip->vendor.miscdev.name = NULL;
    - dev_err(chip->pdev,
    - "unable to misc_register %s, minor %d err=%d\n",
    - chip->vendor.miscdev.name,
    - chip->vendor.miscdev.minor, rc);
    - }
    - return rc;
    -}
    -
    -void tpm_dev_del_device(struct tpm_chip *chip)
    -{
    - if (chip->vendor.miscdev.name)
    - misc_deregister(&chip->vendor.miscdev);
    -}
    diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
    index e2af28f..b6f6b17 100644
    --- a/drivers/char/tpm/tpm-interface.c
    +++ b/drivers/char/tpm/tpm-interface.c
    @@ -997,6 +997,35 @@ int tpm_get_random(u32 chip_num, u8 *out, size_t max)
    }
    EXPORT_SYMBOL_GPL(tpm_get_random);

    +static int __init tpm_init(void)
    +{
    + int rc;
    +
    + tpm_class = class_create(THIS_MODULE, "tpm");
    + if (IS_ERR(tpm_class)) {
    + pr_err("couldn't create tpm class\n");
    + return PTR_ERR(tpm_class);
    + }
    +
    + rc = alloc_chrdev_region(&tpm_devt, 0, TPM_NUM_DEVICES, "tpm");
    + if (rc < 0) {
    + pr_err("tpm: failed to allocate char dev region\n");
    + class_destroy(tpm_class);
    + return rc;
    + }
    +
    + return 0;
    +}
    +
    +static void __exit tpm_exit(void)
    +{
    + class_destroy(tpm_class);
    + unregister_chrdev_region(tpm_devt, TPM_NUM_DEVICES);
    +}
    +
    +subsys_initcall(tpm_init);
    +module_exit(tpm_exit);
    +
    MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
    MODULE_DESCRIPTION("TPM Driver");
    MODULE_VERSION("2.0");
    diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
    index adf6af8..d46765b 100644
    --- a/drivers/char/tpm/tpm.h
    +++ b/drivers/char/tpm/tpm.h
    @@ -23,11 +23,11 @@
    #include <linux/fs.h>
    #include <linux/mutex.h>
    #include <linux/sched.h>
    -#include <linux/miscdevice.h>
    #include <linux/platform_device.h>
    #include <linux/io.h>
    #include <linux/tpm.h>
    #include <linux/acpi.h>
    +#include <linux/cdev.h>

    enum tpm_const {
    TPM_MINOR = 224, /* officially assigned */
    @@ -74,7 +74,6 @@ struct tpm_vendor_specific {
    int region_size;
    int have_region;

    - struct miscdevice miscdev;
    struct list_head list;
    int locality;
    unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* jiffies */
    @@ -104,6 +103,9 @@ enum tpm_chip_flags {

    struct tpm_chip {
    struct device *pdev; /* Device stuff */
    + struct device dev;
    + struct cdev cdev;
    +
    const struct tpm_class_ops *ops;
    unsigned int flags;

    @@ -326,6 +328,10 @@ struct tpm_cmd_t {
    tpm_cmd_params params;
    } __packed;

    +extern struct class *tpm_class;
    +extern dev_t tpm_devt;
    +extern const struct file_operations tpm_fops;
    +
    ssize_t tpm_getcap(struct device *, __be32, cap_t *, const char *);
    ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
    size_t bufsiz);
    @@ -346,8 +352,6 @@ extern struct tpm_chip *tpmm_chip_alloc(struct device *dev,
    extern int tpm_chip_register(struct tpm_chip *chip);
    extern void tpm_chip_unregister(struct tpm_chip *chip);

    -int tpm_dev_add_device(struct tpm_chip *chip);
    -void tpm_dev_del_device(struct tpm_chip *chip);
    int tpm_sysfs_add_device(struct tpm_chip *chip);
    void tpm_sysfs_del_device(struct tpm_chip *chip);

    diff --git a/drivers/char/tpm/tpm_i2c_nuvoton.c b/drivers/char/tpm/tpm_i2c_nuvoton.c
    index e1eadb0..9d42b7d 100644
    --- a/drivers/char/tpm/tpm_i2c_nuvoton.c
    +++ b/drivers/char/tpm/tpm_i2c_nuvoton.c
    @@ -560,7 +560,7 @@ static int i2c_nuvoton_probe(struct i2c_client *client,
    rc = devm_request_irq(dev, chip->vendor.irq,
    i2c_nuvoton_int_handler,
    IRQF_TRIGGER_LOW,
    - chip->vendor.miscdev.name,
    + chip->devname,
    chip);
    if (rc) {
    dev_err(dev, "%s() Unable to request irq: %d for use\n",
    diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
    index 6b15545..89e1abb 100644
    --- a/drivers/char/tpm/tpm_tis.c
    +++ b/drivers/char/tpm/tpm_tis.c
    @@ -698,7 +698,7 @@ static int tpm_tis_init(struct device *dev, acpi_handle acpi_dev_handle,
    TPM_INT_VECTOR(chip->vendor.locality));
    if (devm_request_irq
    (dev, i, tis_int_probe, IRQF_SHARED,
    - chip->vendor.miscdev.name, chip) != 0) {
    + chip->devname, chip) != 0) {
    dev_info(chip->pdev,
    "Unable to request irq: %d for probe\n",
    i);
    @@ -745,7 +745,7 @@ static int tpm_tis_init(struct device *dev, acpi_handle acpi_dev_handle,
    TPM_INT_VECTOR(chip->vendor.locality));
    if (devm_request_irq
    (dev, chip->vendor.irq, tis_int_handler, IRQF_SHARED,
    - chip->vendor.miscdev.name, chip) != 0) {
    + chip->devname, chip) != 0) {
    dev_info(chip->pdev,
    "Unable to request irq: %d for use\n",
    chip->vendor.irq);
    --
    2.1.0


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