linux-kernel - Re: [tpmdd-devel] [PATCH] tpm: Add sysfs interface to show TPM family version

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Date:   Mon, 13 Mar 2017 11:46:11 -0700
From:   James Bottomley <James.Bottomley@...senPartnership.com>
To:     Meng.Li@...driver.com, linux-kernel@...r.kernel.org
Cc:     tpmdd-devel@...ts.sourceforge.net
Subject: Re: [tpmdd-devel] [PATCH] tpm: Add sysfs interface to show TPM
 family version

On Mon, 2017-03-13 at 17:20 +0800, Meng.Li@...driver.com wrote:
[...]
> +/**
> + * 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]);
> +	}
> +}
> +

For non-dynamic attributes, use the attribute_group structure in the
device instead.  It will take care of creation and removal
automatically.

James