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-rw-r--r--drivers/staging/comedi/comedi.h39
1 files changed, 21 insertions, 18 deletions
diff --git a/drivers/staging/comedi/comedi.h b/drivers/staging/comedi/comedi.h
index e90b17775284..09a940066c0e 100644
--- a/drivers/staging/comedi/comedi.h
+++ b/drivers/staging/comedi/comedi.h
@@ -1005,35 +1005,38 @@ enum i8254_mode {
* and INSN_DEVICE_CONFIG_GET_ROUTES.
*/
#define NI_NAMES_BASE 0x8000u
+
+#define _TERM_N(base, n, x) ((base) + ((x) & ((n) - 1)))
+
/*
* not necessarily all allowed 64 PFIs are valid--certainly not for all devices
*/
-#define NI_PFI(x) (NI_NAMES_BASE + ((x) & 0x3f))
+#define NI_PFI(x) _TERM_N(NI_NAMES_BASE, 64, x)
/* 8 trigger lines by standard, Some devices cannot talk to all eight. */
-#define TRIGGER_LINE(x) (NI_PFI(-1) + 1 + ((x) & 0x7))
+#define TRIGGER_LINE(x) _TERM_N(NI_PFI(-1) + 1, 8, x)
/* 4 RTSI shared MUXes to route signals to/from TRIGGER_LINES on NI hardware */
-#define NI_RTSI_BRD(x) (TRIGGER_LINE(-1) + 1 + ((x) & 0x3))
+#define NI_RTSI_BRD(x) _TERM_N(TRIGGER_LINE(-1) + 1, 4, x)
/* *** Counter/timer names : 8 counters max *** */
-#define NI_COUNTER_NAMES_BASE (NI_RTSI_BRD(-1) + 1)
-#define NI_MAX_COUNTERS 7
-#define NI_CtrSource(x) (NI_COUNTER_NAMES_BASE + ((x) & NI_MAX_COUNTERS))
+#define NI_MAX_COUNTERS 8
+#define NI_COUNTER_NAMES_BASE (NI_RTSI_BRD(-1) + 1)
+#define NI_CtrSource(x) _TERM_N(NI_COUNTER_NAMES_BASE, NI_MAX_COUNTERS, x)
/* Gate, Aux, A,B,Z are all treated, at times as gates */
-#define NI_GATES_NAMES_BASE (NI_CtrSource(-1) + 1)
-#define NI_CtrGate(x) (NI_GATES_NAMES_BASE + ((x) & NI_MAX_COUNTERS))
-#define NI_CtrAux(x) (NI_CtrGate(-1) + 1 + ((x) & NI_MAX_COUNTERS))
-#define NI_CtrA(x) (NI_CtrAux(-1) + 1 + ((x) & NI_MAX_COUNTERS))
-#define NI_CtrB(x) (NI_CtrA(-1) + 1 + ((x) & NI_MAX_COUNTERS))
-#define NI_CtrZ(x) (NI_CtrB(-1) + 1 + ((x) & NI_MAX_COUNTERS))
-#define NI_GATES_NAMES_MAX NI_CtrZ(-1)
-#define NI_CtrArmStartTrigger(x) (NI_CtrZ(-1) + 1 + ((x) & NI_MAX_COUNTERS))
+#define NI_GATES_NAMES_BASE (NI_CtrSource(-1) + 1)
+#define NI_CtrGate(x) _TERM_N(NI_GATES_NAMES_BASE, NI_MAX_COUNTERS, x)
+#define NI_CtrAux(x) _TERM_N(NI_CtrGate(-1) + 1, NI_MAX_COUNTERS, x)
+#define NI_CtrA(x) _TERM_N(NI_CtrAux(-1) + 1, NI_MAX_COUNTERS, x)
+#define NI_CtrB(x) _TERM_N(NI_CtrA(-1) + 1, NI_MAX_COUNTERS, x)
+#define NI_CtrZ(x) _TERM_N(NI_CtrB(-1) + 1, NI_MAX_COUNTERS, x)
+#define NI_GATES_NAMES_MAX NI_CtrZ(-1)
+#define NI_CtrArmStartTrigger(x) _TERM_N(NI_CtrZ(-1) + 1, NI_MAX_COUNTERS, x)
#define NI_CtrInternalOutput(x) \
- (NI_CtrArmStartTrigger(-1) + 1 + ((x) & NI_MAX_COUNTERS))
+ _TERM_N(NI_CtrArmStartTrigger(-1) + 1, NI_MAX_COUNTERS, x)
/** external pin(s) labeled conveniently as Ctr<i>Out. */
-#define NI_CtrOut(x) (NI_CtrInternalOutput(-1) + 1 + ((x) & NI_MAX_COUNTERS))
+#define NI_CtrOut(x) _TERM_N(NI_CtrInternalOutput(-1) + 1, NI_MAX_COUNTERS, x)
/** For Buffered sampling of ctr -- x series capability. */
-#define NI_CtrSampleClock(x) (NI_CtrOut(-1) + 1 + ((x) & NI_MAX_COUNTERS))
-#define NI_COUNTER_NAMES_MAX NI_CtrSampleClock(-1)
+#define NI_CtrSampleClock(x) _TERM_N(NI_CtrOut(-1) + 1, NI_MAX_COUNTERS, x)
+#define NI_COUNTER_NAMES_MAX NI_CtrSampleClock(-1)
enum ni_common_signal_names {
/* PXI_Star: this is a non-NI-specific signal */

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