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Subject[PATCH 2/2] firmware: dmi-sysfs: add SMBIOS entry point area attribute
Date
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.khoronzhuk@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..b5c0558 100644
--- a/drivers/firmware/dmi-sysfs.c
+++ b/drivers/firmware/dmi-sysfs.c
@@ -46,6 +46,8 @@ struct dmi_sysfs_entry {
static LIST_HEAD(entry_list);
static DEFINE_SPINLOCK(entry_list_lock);

+static unsigned char smbios_raw_header[32];
+
/* dmi_sysfs_attribute - Top level attribute. used by all entries. */
struct dmi_sysfs_attribute {
struct attribute attr;
@@ -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_entry_area_raw_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;
}

+ size = dmi_get_smbios_entry_area(smbios_raw_header);
+ if (size == -ENODATA) {
+ pr_debug("dmi-sysfs: SMBIOS raw data is not available.\n");
+ error = size;
+ goto err;
+ }
+
+ /* Create the raw binary file to access the entry area */
+ smbios_entry_area_raw_attr.size = size;
+ if (sysfs_create_bin_file(dmi_kobj, &smbios_entry_area_raw_attr))
+ goto err;
+
pr_debug("dmi-sysfs: loaded.\n");

return 0;
--
1.9.1


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