Re: [PATCH] staging: comedi: clarify/unify macros for NI macro-defined terminals

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 24/10/18 15:33, Spencer E. Olson wrote:
Uses a single macro to define multiple macros that represent a series of
terminals for NI devices.  This patch also redefines NI_MAX_COUNTERS as the
maximum number of counters possible on NI devices (instead of the maximum
index of the counters).  This was a little confusing and caused a bug in
commit 347e244884c3b ("staging: comedi: tio: implement global tio/ctr routing")
when setting/reading registers for counter terminals.

Fixes: 347e244884c3b ("staging: comedi: tio: implement global tio/ctr routing")
Signed-off-by: Spencer E. Olson <olsonse@xxxxxxxxx>
---
  drivers/staging/comedi/comedi.h | 39 ++++++++++++++++++---------------
  1 file 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 */


It's no more ugly than the original, although I pity the fool who has to make sense of the preprocessor output!

Reviewed-by: Ian Abbott <abbotti@xxxxxxxxx>

--
-=( Ian Abbott <abbotti@xxxxxxxxx> || Web: www.mev.co.uk )=-
-=( MEV Ltd. is a company registered in England & Wales. )=-
-=( Registered number: 02862268.  Registered address:    )=-
-=( 15 West Park Road, Bramhall, STOCKPORT, SK7 3JZ, UK. )=-
_______________________________________________
devel mailing list
devel@xxxxxxxxxxxxxxxxxxxxxx
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel



[Index of Archives]     [Linux Driver Backports]     [DMA Engine]     [Linux GPIO]     [Linux SPI]     [Video for Linux]     [Linux USB Devel]     [Linux Coverity]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [Yosemite Backpacking]
  Powered by Linux