From 12e1e6960130673aabbbe7f094c4690b00618881 Mon Sep 17 00:00:00 2001 From: Ian Abbott Date: Thu, 23 Jul 2015 16:46:59 +0100 Subject: [PATCH] staging: comedi: usbduxsigma: remove AI scan_begin_src == TRIG_FOLLOW The AI subdevice `cmdtest` handler `usbduxsigma_ai_cmdtest()` ensures that `cmd->scan_begin_src == TRIG_TIMER` by the end of step 2 of the command checking code, so assume that this is the case for step 3 onwards and remove the redundant code. Signed-off-by: Ian Abbott Reviewed-by: Bernd Porr Reviewed-by: H Hartley Sweeten Signed-off-by: Greg Kroah-Hartman --- drivers/staging/comedi/drivers/usbduxsigma.c | 47 ++++++++------------ 1 file changed, 19 insertions(+), 28 deletions(-) diff --git a/drivers/staging/comedi/drivers/usbduxsigma.c b/drivers/staging/comedi/drivers/usbduxsigma.c index dcb7f3037dea..fdc880a4adaf 100644 --- a/drivers/staging/comedi/drivers/usbduxsigma.c +++ b/drivers/staging/comedi/drivers/usbduxsigma.c @@ -482,6 +482,7 @@ static int usbduxsigma_ai_cmdtest(struct comedi_device *dev, struct usbduxsigma_private *devpriv = dev->private; int high_speed = devpriv->high_speed; int interval = usbduxsigma_chans_to_interval(cmd->chanlist_len); + unsigned int tmp; int err = 0; /* Step 1 : check if triggers are trivially valid */ @@ -509,36 +510,26 @@ static int usbduxsigma_ai_cmdtest(struct comedi_device *dev, err |= comedi_check_trigger_arg_is(&cmd->start_arg, 0); - if (cmd->scan_begin_src == TRIG_FOLLOW) /* internal trigger */ - err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, 0); + if (high_speed) { + /* + * In high speed mode microframes are possible. + * However, during one microframe we can roughly + * sample two channels. Thus, the more channels + * are in the channel list the more time we need. + */ + err |= comedi_check_trigger_arg_min(&cmd->scan_begin_arg, + (125000 * interval)); - if (cmd->scan_begin_src == TRIG_TIMER) { - unsigned int tmp; - - if (high_speed) { - /* - * In high speed mode microframes are possible. - * However, during one microframe we can roughly - * sample two channels. Thus, the more channels - * are in the channel list the more time we need. - */ - err |= comedi_check_trigger_arg_min(&cmd-> - scan_begin_arg, - (1000000 / 8 * - interval)); - - tmp = (cmd->scan_begin_arg / 125000) * 125000; - } else { - /* full speed */ - /* 1kHz scans every USB frame */ - err |= comedi_check_trigger_arg_min(&cmd-> - scan_begin_arg, - 1000000); - - tmp = (cmd->scan_begin_arg / 1000000) * 1000000; - } - err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, tmp); + tmp = (cmd->scan_begin_arg / 125000) * 125000; + } else { + /* full speed */ + /* 1kHz scans every USB frame */ + err |= comedi_check_trigger_arg_min(&cmd->scan_begin_arg, + 1000000); + + tmp = (cmd->scan_begin_arg / 1000000) * 1000000; } + err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, tmp); err |= comedi_check_trigger_arg_is(&cmd->scan_end_arg, cmd->chanlist_len); -- 2.39.5