ACPI: add ACPICA version in sysfs

Add an ACPI attribute to indicate ACPICA version.
/proc/acpi/version is deprecated by /sys/module/acpi/parameters/acpica_version.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/drivers/acpi/system.c b/drivers/acpi/system.c
index d86dcb3c2366..407b0e0281db 100644
--- a/drivers/acpi/system.c
+++ b/drivers/acpi/system.c
@@ -32,6 +32,11 @@
 
 #define _COMPONENT              ACPI_SYSTEM_COMPONENT
 ACPI_MODULE_NAME("acpi_system")
+#ifdef MODULE_PARAM_PREFIX
+#undef MODULE_PARAM_PREFIX
+#endif
+#define MODULE_PARAM_PREFIX "acpi."
+
 #define ACPI_SYSTEM_CLASS               "system"
 #define ACPI_SYSTEM_DRIVER_NAME         "ACPI System Driver"
 #define ACPI_SYSTEM_DEVICE_NAME         "System"
@@ -41,9 +46,23 @@ ACPI_MODULE_NAME("acpi_system")
 #define ACPI_SYSTEM_FILE_FADT           "fadt"
 extern struct fadt_descriptor acpi_fadt;
 
+/*
+ * Make ACPICA version work as module param
+ */
+static int param_get_acpica_version(char *buffer, struct kernel_param *kp) {
+        int result;
+
+        result = sprintf(buffer, "%x", ACPI_CA_VERSION);
+
+        return result;
+}
+
+module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444);
+
 /* --------------------------------------------------------------------------
                               FS Interface (/proc)
    -------------------------------------------------------------------------- */
+#ifdef CONFIG_ACPI_PROCFS
 
 static int acpi_system_read_info(struct seq_file *seq, void *offset)
 {
@@ -63,6 +82,7 @@ static const struct file_operations acpi_system_info_ops = {
         .llseek = seq_lseek,
         .release = single_release,
 };
+#endif
 
 static ssize_t acpi_system_read_dsdt(struct file *, char __user *, size_t,
                                      loff_t *);
@@ -128,6 +148,7 @@ static int __init acpi_system_init(void)
         if (acpi_disabled)
                 return 0;
 
+#ifdef CONFIG_ACPI_PROCFS
         /* 'info' [R] */
         name = ACPI_SYSTEM_FILE_INFO;
         entry = create_proc_entry(name, S_IRUGO, acpi_root_dir);
@@ -136,6 +157,7 @@ static int __init acpi_system_init(void)
         else {
                 entry->proc_fops = &acpi_system_info_ops;
         }
+#endif
 
         /* 'dsdt' [R] */
         name = ACPI_SYSTEM_FILE_DSDT;
@@ -159,7 +181,9 @@ static int __init acpi_system_init(void)
       Error:
         remove_proc_entry(ACPI_SYSTEM_FILE_FADT, acpi_root_dir);
         remove_proc_entry(ACPI_SYSTEM_FILE_DSDT, acpi_root_dir);
+#ifdef CONFIG_ACPI_PROCFS
         remove_proc_entry(ACPI_SYSTEM_FILE_INFO, acpi_root_dir);
+#endif
 
         error = -EFAULT;
         goto Done;