use DEFINE_SEMAPHORE in 2.6.37+

Building tp_smapi against 2.6.37 fails because 'DECLARE_MUTEX'
has been removed in 4882720b267b7b1d1b0ce08334b205f0329d4615
in torvalds/linux-2.6.git. Use DEFINE_SEMAPHORE instead.

Author: Tanaka Watanabe

thinkpad_ec.c

@@ -88,7 +88,11 @@ static u64 prefetch_jiffies;                      /* time of prefetch, or: */
 #define TPC_PREFETCH_JUNK   (INITIAL_JIFFIES+1)   /*   Ignore prefetch */
 
 /* Locking: */
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37)
 static DECLARE_MUTEX(thinkpad_ec_mutex);
+#else
+static DEFINE_SEMAPHORE(thinkpad_ec_mutex);
+#endif
 
 /* Kludge in case the ACPI DSDT reserves the ports we need. */
 static int force_io;    /* Willing to do IO to ports we couldn't reserve? */

tp_smapi.c

@@ -109,7 +109,11 @@ static struct { u8 rc; char *msg; int ret; } smapi_retcode[] =
 #define SMAPI_PORT2 0x4F           /* fixed port, meaning unclear */
 static unsigned short smapi_port;  /* APM control port, normally 0xB2 */
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37)
 static DECLARE_MUTEX(smapi_mutex);
+#else
+static DEFINE_SEMAPHORE(smapi_mutex);
+#endif
 
 /**
  * find_smapi_port - read SMAPI port from NVRAM