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staging: comedi: adl_pci9118: clarify async command start

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The async command can start immediately (TRIG_NOW), from an internal
trigger (TRIG_INT), or from an external trigger (TRIG_EXT). Currently
the start of the command is scattered in the DMA and non-DMA helper
functions.

Consolidate the start of the async command at the end of the (*do_cmd)
function. For aesthetics, use the 'cmd->start_src' directly instead
of the 'ai12_startstop' in the private data to determine how to start
the command. This also fixes a minor bug where the external trigger
gets enabled for a start_src == TRIG_INT.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
H Hartley Sweeten 2014-09-09 13:05:53 -07:00 committed by Greg Kroah-Hartman
parent 5e17ae870c
commit e7d2191b0b
1 changed files with 13 additions and 21 deletions
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34
drivers/staging/comedi/drivers/adl_pci9118.c
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@ -142,7 +142,6 @@
#define START_AI_EXT 0x01 /* start measure on external trigger */
#define STOP_AI_EXT 0x02 /* stop measure on external trigger */
#define START_AI_INT 0x04 /* start measure on internal trigger */
#define STOP_AI_INT 0x08 /* stop measure on internal trigger */
#define PCI9118_HALF_FIFO_SZ (1024 / 2)
@ -790,15 +789,12 @@ static int pci9118_ai_inttrig(struct comedi_device *dev,
struct comedi_subdevice *s,
unsigned int trig_num)
{
struct pci9118_private *devpriv = dev->private;
struct comedi_cmd *cmd = &s->async->cmd;
if (trig_num != cmd->start_arg)
return -EINVAL;
devpriv->ai12_startstop &= ~START_AI_INT;
s->async->inttrig = NULL;
pci9118_ai_cmd_start(dev);
return 1;
@ -1112,9 +1108,6 @@ static int pci9118_ai_docmd_sampl(struct comedi_device *dev,
return -EIO;
}
if (devpriv->ai12_startstop)
pci9118_exttrg_enable(dev, true);
if ((devpriv->ai_do == 1) || (devpriv->ai_do == 2))
devpriv->int_ctrl |= PCI9118_INT_CTRL_TIMER;
@ -1122,9 +1115,6 @@ static int pci9118_ai_docmd_sampl(struct comedi_device *dev,
pci9118_amcc_int_ena(dev, true);
if (!(devpriv->ai12_startstop & (START_AI_EXT | START_AI_INT)))
pci9118_ai_cmd_start(dev);
return 0;
}
@ -1166,15 +1156,9 @@ static int pci9118_ai_docmd_dma(struct comedi_device *dev,
return -EIO;
}
if (devpriv->ai12_startstop)
pci9118_exttrg_enable(dev, true);
outl(0x02000000 | AINT_WRITE_COMPL,
devpriv->iobase_a + AMCC_OP_REG_INTCSR);
if (!(devpriv->ai12_startstop & (START_AI_EXT | START_AI_INT)))
pci9118_ai_cmd_start(dev);
return 0;
}
@ -1197,10 +1181,6 @@ static int pci9118_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
devpriv->ai_neverending = 1;
devpriv->ai12_startstop |= STOP_AI_EXT;
}
if (cmd->start_src == TRIG_INT) {
devpriv->ai12_startstop |= START_AI_INT;
s->async->inttrig = pci9118_ai_inttrig;
}
if (cmd->stop_src == TRIG_NONE)
devpriv->ai_neverending = 1;
if (cmd->stop_src == TRIG_COUNT)
@ -1358,8 +1338,20 @@ static int pci9118_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
ret = pci9118_ai_docmd_dma(dev, s);
else
ret = pci9118_ai_docmd_sampl(dev, s);
if (ret)
return ret;
return ret;
/* start async command now or wait for internal trigger */
if (cmd->start_src == TRIG_NOW)
pci9118_ai_cmd_start(dev);
else if (cmd->start_src == TRIG_INT)
s->async->inttrig = pci9118_ai_inttrig;
/* enable external trigger for command start/stop */
if (cmd->start_src == TRIG_EXT || cmd->stop_src == TRIG_EXT)
pci9118_exttrg_enable(dev, true);
return 0;
}
static int pci9118_ai_eoc(struct comedi_device *dev,