On 26 January 2015 at 13:28, Ivan Khoronzhuk <ivan.khoronz...@linaro.org> wrote:
> There are situations when code needs to access SMBIOS entry table
> area, but cannot use /dev/mem for this. As the table format is
> consistent only for a version, and can be changed, use binary
> attribute to give access to raw SMBIOS entry table area.
>
> Signed-off-by: Ivan Khoronzhuk <ivan.khoronz...@linaro.org>
Reviewed-by: Ard Biesheuvel <ard.biesheu...@linaro.org>
> ---
> drivers/firmware/dmi-sysfs.c | 42 ++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 42 insertions(+)
>
> diff --git a/drivers/firmware/dmi-sysfs.c b/drivers/firmware/dmi-sysfs.c
> index e0f1cb3..61b6a38 100644
> --- a/drivers/firmware/dmi-sysfs.c
> +++ b/drivers/firmware/dmi-sysfs.c
> @@ -29,6 +29,8 @@
> #define MAX_ENTRY_TYPE 255 /* Most of these aren't used, but we consider
> the top entry type is only 8 bits */
>
> +static const u8 *smbios_raw_header;
> +
> struct dmi_sysfs_entry {
> struct dmi_header dh;
> struct kobject kobj;
> @@ -646,9 +648,37 @@ static void cleanup_entry_list(void)
> }
> }
>
> +static ssize_t smbios_entry_area_raw_read(struct file *filp,
> + struct kobject *kobj,
> + struct bin_attribute *bin_attr,
> + char *buf, loff_t pos, size_t count)
> +{
> + ssize_t size;
> +
> + size = bin_attr->size;
> +
> + if (size > pos)
> + size -= pos;
> + else
> + return 0;
> +
> + if (count < size)
> + size = count;
> +
> + memcpy(buf, &smbios_raw_header[pos], size);
> +
> + return size;
> +}
> +
> +static struct bin_attribute smbios_raw_area_attr = {
> + .read = smbios_entry_area_raw_read,
> + .attr = {.name = "smbios_raw_header", .mode = 0400},
> +};
> +
> static int __init dmi_sysfs_init(void)
> {
> int error = -ENOMEM;
> + int size;
> int val;
>
> /* Set up our directory */
> @@ -669,6 +699,18 @@ static int __init dmi_sysfs_init(void)
> goto err;
> }
>
> + smbios_raw_header = dmi_get_smbios_entry_area(&size);
> + if (!smbios_raw_header) {
> + pr_debug("dmi-sysfs: SMBIOS raw data is not available.\n");
> + error = -ENODATA;
> + goto err;
> + }
> +
> + /* Create the raw binary file to access the entry area */
> + smbios_raw_area_attr.size = size;
> + if (sysfs_create_bin_file(dmi_kobj, &smbios_raw_area_attr))
> + goto err;
> +
> pr_debug("dmi-sysfs: loaded.\n");
>
> return 0;
> --
> 1.9.1
>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
