ACPI: thinkpad-acpi: clean up hotkey subdriver

Cleanup hotkey subdriver code.

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

1 files changed, 29 insertions, 17 deletions

diff --git a/drivers/misc/thinkpad_acpi.c b/drivers/misc/thinkpad_acpi.c
index 809ec8400ec5..344eb551c443 100644
--- a/drivers/misc/thinkpad_acpi.c
+++ b/drivers/misc/thinkpad_acpi.c
@@ -511,6 +511,8 @@ static int hotkey_orig_mask;
 
 static int __init hotkey_init(struct ibm_init_struct *iibm)
 {
+        int res;
+
         vdbg_printk(TPACPI_DBG_INIT, "initializing hotkey subdriver\n");
 
         IBM_ACPIHANDLE_INIT(hkey);
@@ -530,8 +532,9 @@ static int __init hotkey_init(struct ibm_init_struct *iibm)
                 vdbg_printk(TPACPI_DBG_INIT, "hotkey masks are %s\n",
                         str_supported(tp_features.hotkey_mask));
 
-                if (!hotkey_get(&hotkey_orig_status, &hotkey_orig_mask))
-                        return -ENODEV;
+                res = hotkey_get(&hotkey_orig_status, &hotkey_orig_mask);
+                if (res)
+                        return res;
         }
 
         return (tp_features.hotkey)? 0 : 1;
@@ -539,9 +542,13 @@ static int __init hotkey_init(struct ibm_init_struct *iibm)
 
 static void hotkey_exit(void)
 {
+        int res;
+
         if (tp_features.hotkey) {
                 dbg_printk(TPACPI_DBG_EXIT, "restoring original hotkey mask\n");
-                hotkey_set(hotkey_orig_status, hotkey_orig_mask);
+                res = hotkey_set(hotkey_orig_status, hotkey_orig_mask);
+                if (res)
+                        printk(IBM_ERR "failed to restore hotkey to BIOS defaults\n");
         }
 }
 
@@ -560,13 +567,13 @@ static void hotkey_notify(struct ibm_struct *ibm, u32 event)
 static int hotkey_get(int *status, int *mask)
 {
         if (!acpi_evalf(hkey_handle, status, "DHKC", "d"))
-                return 0;
+                return -EIO;
 
         if (tp_features.hotkey_mask)
                 if (!acpi_evalf(hkey_handle, mask, "DHKN", "d"))
-                        return 0;
+                        return -EIO;
 
-        return 1;
+        return 0;
 }
 
 static int hotkey_set(int status, int mask)
@@ -574,22 +581,22 @@ static int hotkey_set(int status, int mask)
         int i;
 
         if (!acpi_evalf(hkey_handle, NULL, "MHKC", "vd", status))
-                return 0;
+                return -EIO;
 
         if (tp_features.hotkey_mask)
                 for (i = 0; i < 32; i++) {
                         int bit = ((1 << i) & mask) != 0;
                         if (!acpi_evalf(hkey_handle,
                                         NULL, "MHKM", "vdd", i + 1, bit))
-                                return 0;
+                                return -EIO;
                 }
 
-        return 1;
+        return 0;
 }
 
 static int hotkey_read(char *p)
 {
-        int status, mask;
+        int res, status, mask;
         int len = 0;
 
         if (!tp_features.hotkey) {
@@ -597,8 +604,9 @@ static int hotkey_read(char *p)
                 return len;
         }
 
-        if (!hotkey_get(&status, &mask))
-                return -EIO;
+        res = hotkey_get(&status, &mask);
+        if (res)
+                return res;
 
         len += sprintf(p + len, "status:\t\t%s\n", enabled(status, 0));
         if (tp_features.hotkey_mask) {
@@ -615,15 +623,16 @@ static int hotkey_read(char *p)
 
 static int hotkey_write(char *buf)
 {
-        int status, mask;
+        int res, status, mask;
         char *cmd;
         int do_cmd = 0;
 
         if (!tp_features.hotkey)
                 return -ENODEV;
 
-        if (!hotkey_get(&status, &mask))
-                return -EIO;
+        res = hotkey_get(&status, &mask);
+        if (res)
+                return res;
 
         while ((cmd = next_cmd(&buf))) {
                 if (strlencmp(cmd, "enable") == 0) {
@@ -642,8 +651,11 @@ static int hotkey_write(char *buf)
                 do_cmd = 1;
         }
 
-        if (do_cmd && !hotkey_set(status, mask))
-                return -EIO;
+        if (do_cmd) {
+                res = hotkey_set(status, mask);
+                if (res)
+                        return res;
+        }
 
         return 0;
 }