On Mon, Mar 13, 2017 at 05:20:17PM +0800, [email protected] wrote:
> From: Limeng <[email protected]>
>
> So far, there is not a sysfs interface for user space code to
> check the TPM family version(TPM1.x or TPM2). So, add a
> file named description in /sys/class/tpm/tpmX/ to show it.
>
> Signed-off-by: Meng Li <[email protected]>
> ---
Is this the first or which version of the patch is this? Version
number and changelog are missing :/
/Jarkko
> drivers/char/tpm/tpm-chip.c | 70
> +++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 70 insertions(+)
>
> diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
> index c406343..b222421 100644
> --- a/drivers/char/tpm/tpm-chip.c
> +++ b/drivers/char/tpm/tpm-chip.c
> @@ -36,6 +36,68 @@
> dev_t tpm_devt;
>
> /**
> + * show_description - sysfs interface for checking current TPM hardware
> version.
> + * @dev: pointer to tpm chip device
> + * @attr: unused
> + * @buf: char buffer to be filled with TPM hardware version info
> + *
> + * Provides sysfs interface for showing current TPM hardware version.
> + */
> +static ssize_t show_description(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + struct tpm_chip *chip = (struct tpm_chip *)container_of(dev,struct
> tpm_chip,dev);
> + int ret;
> +
> + if (chip->flags & TPM_CHIP_FLAG_TPM2)
> + ret = sprintf(buf, "TPM 2.0");
> + else
> + ret = sprintf(buf, "TPM 1.x");
> +
> + return ret;
> +}
> +
> +static struct device_attribute tpm_attrs[] = {
> + __ATTR(description, S_IRUGO, show_description, NULL),
> +};
> +
> +/**
> + * tpm_create_sysfs - Create tpm sysfs interface.
> + * @dev: pointer to tpm chip device
> + *
> + * Create sysfs interface for checking current TPM hardware version.
> + */
> +static int tpm_create_sysfs(struct device *dev)
> +{
> + int r, t;
> +
> + for (t = 0; t < ARRAY_SIZE(tpm_attrs); t++) {
> + r = device_create_file(dev, &tpm_attrs[t]);
> + if (r) {
> + dev_err(dev, "failed to create sysfs file\n");
> + return r;
> + }
> + }
> +
> + return 0;
> +}
> +
> +/**
> + * tpm_remove_sysfs - Remove tpm sysfs interface.
> + * @dev: pointer to tpm chip device
> + *
> + * Remove sysfs interface for checking current TPM hardware version.
> + */
> +static void tpm_remove_sysfs(struct device *dev)
> +{
> + int t;
> +
> + for (t = 0; t < ARRAY_SIZE(tpm_attrs); t++) {
> + device_remove_file(dev, &tpm_attrs[t]);
> + }
> +}
> +
> +/**
> * tpm_try_get_ops() - Get a ref to the tpm_chip
> * @chip: Chip to ref
> *
> @@ -363,6 +425,13 @@ int tpm_chip_register(struct tpm_chip *chip)
> return rc;
> }
>
> + rc = tpm_create_sysfs(&chip->dev);
> + if (rc) {
> + tpm_del_legacy_sysfs(chip);
> + tpm_chip_unregister(chip);
> + return rc;
> + }
> +
> return 0;
> }
> EXPORT_SYMBOL_GPL(tpm_chip_register);
> @@ -382,6 +451,7 @@ int tpm_chip_register(struct tpm_chip *chip)
> */
> void tpm_chip_unregister(struct tpm_chip *chip)
> {
> + tpm_remove_sysfs(&chip->dev);
> tpm_del_legacy_sysfs(chip);
> tpm_bios_log_teardown(chip);
> tpm_del_char_device(chip);
> --
> 1.7.9.5
>
------------------------------------------------------------------------------
Announcing the Oxford Dictionaries API! The API offers world-renowned
dictionary content that is easy and intuitive to access. Sign up for an
account today to start using our lexical data to power your apps and
projects. Get started today and enter our developer competition.
http://sdm.link/oxford
_______________________________________________
tpmdd-devel mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/tpmdd-devel
