linux-kernel - [PATCH 3/6] staging: comedi: usbduxsigma: remove AI scan_begin_src == TRIG

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Message-Id: <1437666422-25222-4-git-send-email-abbotti@mev.co.uk>
Date:	Thu, 23 Jul 2015 16:46:59 +0100
From:	Ian Abbott <abbotti@....co.uk>
To:	<driverdev-devel@...uxdriverproject.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ian Abbott <abbotti@....co.uk>,
	H Hartley Sweeten <hsweeten@...ionengravers.com>,
	Bernd Porr <mail@...ndporr.me.uk>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH 3/6] 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 <abbotti@....co.uk>
---
 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 dc0b25a..65a0df4 100644
--- a/drivers/staging/comedi/drivers/usbduxsigma.c
+++ b/drivers/staging/comedi/drivers/usbduxsigma.c
@@ -481,6 +481,7 @@ 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 */
@@ -508,36 +509,26 @@ 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);
-- 
2.1.4

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