SFI: add sysfs interface for SFI tables.

Analogous to ACPI's /sys/firmware/acpi/tables/...

create /sys/firmware/sfi/tables/

The tables are primariy for the kernel,
but sometimes it is useful for user-space to be
able to read them.

Signed-off-by: Feng Tang <feng.tang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 41 insertions, 0 deletions

diff --git a/drivers/sfi/sfi_acpi.c b/drivers/sfi/sfi_acpi.c
index 34aba30eb84b..f5b4ca581541 100644
--- a/drivers/sfi/sfi_acpi.c
+++ b/drivers/sfi/sfi_acpi.c
@@ -173,3 +173,44 @@ int sfi_acpi_table_parse(char *signature, char *oem_id, char *oem_table_id,
         sfi_acpi_put_table(table);
         return ret;
 }
+
+static ssize_t sfi_acpi_table_show(struct file *filp, struct kobject *kobj,
+                               struct bin_attribute *bin_attr, char *buf,
+                               loff_t offset, size_t count)
+{
+        struct sfi_table_attr *tbl_attr =
+            container_of(bin_attr, struct sfi_table_attr, attr);
+        struct acpi_table_header *th = NULL;
+        struct sfi_table_key key;
+        ssize_t cnt;
+
+        key.sig = tbl_attr->name;
+        key.oem_id = NULL;
+        key.oem_table_id = NULL;
+
+        th = sfi_acpi_get_table(&key);
+        if (!th)
+                return 0;
+
+        cnt =  memory_read_from_buffer(buf, count, &offset,
+                                        th, th->length);
+        sfi_acpi_put_table(th);
+
+        return cnt;
+}
+
+
+void __init sfi_acpi_sysfs_init(void)
+{
+        u32 tbl_cnt, i;
+        struct sfi_table_attr *tbl_attr;
+
+        tbl_cnt = XSDT_GET_NUM_ENTRIES(xsdt_va, u64);
+        for (i = 0; i < tbl_cnt; i++) {
+                tbl_attr =
+                        sfi_sysfs_install_table(xsdt_va->table_offset_entry[i]);
+                tbl_attr->attr.read = sfi_acpi_table_show;
+        }
+
+        return;
+}