From 1392dccbbd70a064864ac698e2897a22a8ce370c Mon Sep 17 00:00:00 2001 From: H Hartley Sweeten Date: Thu, 14 Apr 2016 09:58:01 -0700 Subject: [PATCH] staging: comedi: ni_mio_common: tidy up AO scan begin The (*do_cmdtest) validates that the cmd->scan_begin_src will only be TRIG_TIMER or TRIG_EXT. Refactor ni_ao_cmd_set_update() and remove the BUG() which can never occur. Signed-off-by: H Hartley Sweeten Reviewed-by: Ian Abbott Signed-off-by: Greg Kroah-Hartman --- .../staging/comedi/drivers/ni_mio_common.c | 39 +++++++------------ 1 file changed, 15 insertions(+), 24 deletions(-) diff --git a/drivers/staging/comedi/drivers/ni_mio_common.c b/drivers/staging/comedi/drivers/ni_mio_common.c index c89bd1fbffee..1e2e89fccb5b 100644 --- a/drivers/staging/comedi/drivers/ni_mio_common.c +++ b/drivers/staging/comedi/drivers/ni_mio_common.c @@ -3099,8 +3099,9 @@ static void ni_ao_cmd_set_update(struct comedi_device *dev, NISTC_AO_MODE1_UPDATE_SRC_POLARITY ); - switch (cmd->scan_begin_src) { - case TRIG_TIMER: + if (cmd->scan_begin_src == TRIG_TIMER) { + unsigned int trigvar; + devpriv->ao_cmd2 &= ~NISTC_AO_CMD2_BC_GATE_ENA; /* @@ -3131,35 +3132,25 @@ static void ni_ao_cmd_set_update(struct comedi_device *dev, * eseries/ni67xx and tMSeries.h for mseries. */ - { - unsigned int trigvar; - - trigvar = ni_ns_to_timer(dev, cmd->scan_begin_arg, - CMDF_ROUND_NEAREST); + trigvar = ni_ns_to_timer(dev, cmd->scan_begin_arg, + CMDF_ROUND_NEAREST); - /* - * Wait N TB3 ticks after the start trigger before - * clocking(N must be >=2). - */ - /* following line: 2-1 per STC */ - ni_stc_writel(dev, 1, NISTC_AO_UI_LOADA_REG); - ni_stc_writew(dev, NISTC_AO_CMD1_UI_LOAD, - NISTC_AO_CMD1_REG); - /* following line: N-1 per STC */ - ni_stc_writel(dev, trigvar - 1, NISTC_AO_UI_LOADA_REG); - } - break; - case TRIG_EXT: + /* + * Wait N TB3 ticks after the start trigger before + * clocking (N must be >=2). + */ + /* following line: 2-1 per STC */ + ni_stc_writel(dev, 1, NISTC_AO_UI_LOADA_REG); + ni_stc_writew(dev, NISTC_AO_CMD1_UI_LOAD, NISTC_AO_CMD1_REG); + /* following line: N-1 per STC */ + ni_stc_writel(dev, trigvar - 1, NISTC_AO_UI_LOADA_REG); + } else { /* TRIG_EXT */ /* FIXME: assert scan_begin_arg != 0, ret failure otherwise */ devpriv->ao_cmd2 |= NISTC_AO_CMD2_BC_GATE_ENA; devpriv->ao_mode1 |= NISTC_AO_MODE1_UPDATE_SRC( CR_CHAN(cmd->scan_begin_arg)); if (cmd->scan_begin_arg & CR_INVERT) devpriv->ao_mode1 |= NISTC_AO_MODE1_UPDATE_SRC_POLARITY; - break; - default: - BUG(); - break; } ni_stc_writew(dev, devpriv->ao_cmd2, NISTC_AO_CMD2_REG); -- 2.34.1