Introduced sane limits checking for all chip modules

Like the LM78 before, all chips now handle strange values written to /proc/...
with grace - that is, they convert them to the most sane value considering
the circumstances, instead of reacting with strange resulting values
(note that they were already crash-free).

I also removed a factor '2' in the computation of the fan speeds in the
gl518sm module. This is conforming with the sheet; if your fan gives two
'ticks' for each rotation, just modify sensors.conf.

I tried to introduce rounding and limit checking to the maxilife module.
The VID computation is not yet rounded - I need the real formula for that.


git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@382 7894878c-1315-0410-8ee3-d5d059ff63e0

kernel/chips/sis5595.c

@@ -83,26 +83,26 @@ SENSORS_INSMOD_1(sis5595);
 
 #define SIS5595_REG_CONFIG 0x40
 
-/* Conversions. Rounding is only done on the TO_REG variants. */
-#define IN_TO_REG(val)  (((val) * 10 + 8)/16)
+/* Conversions. Rounding and limit checking is only done on the TO_REG
+   variants. Note that you should be a bit careful with which arguments
+   these macros are called: arguments may be evaluated more than once.
+   Fixing this is just not worth it. */
+
+#define IN_TO_REG(val)  (SENSORS_LIMIT((((val) * 10 + 8)/16),0,255))
 #define IN_FROM_REG(val) (((val) *  16) / 10)
 
-static inline unsigned char
-FAN_TO_REG (unsigned rpm, unsigned divisor)
+extern inline u8 FAN_TO_REG(long rpm, int div)
 {
-  unsigned val;
-  
   if (rpm == 0)
-      return 255;
-
-  val = (1350000 + rpm * divisor / 2) / (rpm * divisor);
-  if (val > 255)
-      val = 255;
-  return val;
+    return 255;
+  rpm = SENSORS_LIMIT(rpm,1,1000000);
+  return SENSORS_LIMIT((1350000 + rpm*div/2) / (rpm*div),1,254);
 }
+
 #define FAN_FROM_REG(val,div) ((val)==0?-1:(val)==255?0:1350000/((val)*(div)))
 
-#define TEMP_TO_REG(val) (((val)<0?(((val)-5)/10)&0xff:((val)+5)/10) & 0xff)
+#define TEMP_TO_REG(val) (SENSORS_LIMIT(((val)<0?(((val)-5)/10):\
+                                                 ((val)+5)/10),0,255))
 #define TEMP_FROM_REG(val) (((val)>0x80?(val)-0x100:(val))*10)
 
 #define ALARMS_FROM_REG(val) (val)