ACPI: thinkpad-acpi: add sysfs support to the cmos command subdriver

Add sysfs attributes to send ThinkPad CMOS commands.

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 33 insertions, 0 deletions

diff --git a/drivers/misc/thinkpad_acpi.c b/drivers/misc/thinkpad_acpi.c
index 79abc6841e30..ba749df189ab 100644
--- a/drivers/misc/thinkpad_acpi.c
+++ b/drivers/misc/thinkpad_acpi.c
@@ -1743,8 +1743,30 @@ static struct ibm_struct bay_driver_data = {
  * CMOS subdriver
  */
 
+/* sysfs cmos_command -------------------------------------------------- */
+static ssize_t cmos_command_store(struct device *dev,
+                            struct device_attribute *attr,
+                            const char *buf, size_t count)
+{
+        unsigned long cmos_cmd;
+        int res;
+
+        if (parse_strtoul(buf, 21, &cmos_cmd))
+                return -EINVAL;
+
+        res = issue_thinkpad_cmos_command(cmos_cmd);
+        return (res)? res : count;
+}
+
+static struct device_attribute dev_attr_cmos_command =
+        __ATTR(cmos_command, S_IWUSR, NULL, cmos_command_store);
+
+/* --------------------------------------------------------------------- */
+
 static int __init cmos_init(struct ibm_init_struct *iibm)
 {
+        int res;
+
         vdbg_printk(TPACPI_DBG_INIT,
                 "initializing cmos commands subdriver\n");
 
@@ -1752,9 +1774,19 @@ static int __init cmos_init(struct ibm_init_struct *iibm)
 
         vdbg_printk(TPACPI_DBG_INIT, "cmos commands are %s\n",
                 str_supported(cmos_handle != NULL));
+
+        res = device_create_file(&tpacpi_pdev->dev, &dev_attr_cmos_command);
+        if (res)
+                return res;
+
         return (cmos_handle)? 0 : 1;
 }
 
+static void cmos_exit(void)
+{
+        device_remove_file(&tpacpi_pdev->dev, &dev_attr_cmos_command);
+}
+
 static int cmos_read(char *p)
 {
         int len = 0;
@@ -1795,6 +1827,7 @@ static struct ibm_struct cmos_driver_data = {
         .name = "cmos",
         .read = cmos_read,
         .write = cmos_write,
+        .exit = cmos_exit,
 };
 
 /*************************************************************************