From f676376d692d8e02603e2bf1d0b4e8ca1b56506d Mon Sep 17 00:00:00 2001 From: H Hartley Sweeten Date: Mon, 5 Oct 2015 14:23:06 -0700 Subject: [PATCH] staging: comedi: quatech_daqp_cs: remove 'interrupt_mode' The interrupt handler is now only used for the ai async command. Remove the unnecessary 'interrupt_mode' from the private data and tidy up the interrupt handler. Signed-off-by: H Hartley Sweeten Reviewed-by: Ian Abbott Signed-off-by: Greg Kroah-Hartman --- .../staging/comedi/drivers/quatech_daqp_cs.c | 66 ++++++++----------- 1 file changed, 26 insertions(+), 40 deletions(-) diff --git a/drivers/staging/comedi/drivers/quatech_daqp_cs.c b/drivers/staging/comedi/drivers/quatech_daqp_cs.c index bab3293a8705..7432e5761539 100644 --- a/drivers/staging/comedi/drivers/quatech_daqp_cs.c +++ b/drivers/staging/comedi/drivers/quatech_daqp_cs.c @@ -143,8 +143,6 @@ struct daqp_private { int stop; - - enum { semaphore, buffer } interrupt_mode; }; static const struct comedi_lrange range_daqp_ai = { @@ -187,8 +185,6 @@ static int daqp_ai_cancel(struct comedi_device *dev, struct comedi_subdevice *s) /* flush any linguring data in FIFO - superfluous here */ /* outb(DAQP_CMD_RSTF, dev->iobase + DAQP_CMD_REG); */ - devpriv->interrupt_mode = semaphore; - return 0; } @@ -206,10 +202,9 @@ static unsigned int daqp_ai_get_sample(struct comedi_device *dev, return comedi_offset_munge(s, val); } -static enum irqreturn daqp_interrupt(int irq, void *dev_id) +static irqreturn_t daqp_interrupt(int irq, void *dev_id) { struct comedi_device *dev = dev_id; - struct daqp_private *devpriv = dev->private; struct comedi_subdevice *s = dev->read_subdev; struct comedi_cmd *cmd = &s->async->cmd; int loop_limit = 10000; @@ -218,46 +213,39 @@ static enum irqreturn daqp_interrupt(int irq, void *dev_id) if (!dev->attached) return IRQ_NONE; - switch (devpriv->interrupt_mode) { - case semaphore: - break; + status = inb(dev->iobase + DAQP_STATUS_REG); + while (!(status & DAQP_STATUS_FIFO_EMPTY)) { + unsigned short data; - case buffer: - while (!((status = inb(dev->iobase + DAQP_STATUS_REG)) - & DAQP_STATUS_FIFO_EMPTY)) { - unsigned short data; + if (status & DAQP_STATUS_DATA_LOST) { + s->async->events |= COMEDI_CB_OVERFLOW; + dev_warn(dev->class_dev, "data lost\n"); + break; + } - if (status & DAQP_STATUS_DATA_LOST) { - s->async->events |= COMEDI_CB_OVERFLOW; - dev_warn(dev->class_dev, "data lost\n"); - break; - } + data = daqp_ai_get_sample(dev, s); + comedi_buf_write_samples(s, &data, 1); - data = daqp_ai_get_sample(dev, s); - comedi_buf_write_samples(s, &data, 1); + if (cmd->stop_src == TRIG_COUNT && + s->async->scans_done >= cmd->stop_arg) { + s->async->events |= COMEDI_CB_EOA; + break; + } - /* If there's a limit, decrement it - * and stop conversion if zero - */ + if ((loop_limit--) <= 0) + break; - if (cmd->stop_src == TRIG_COUNT && - s->async->scans_done >= cmd->stop_arg) { - s->async->events |= COMEDI_CB_EOA; - break; - } + status = inb(dev->iobase + DAQP_STATUS_REG); + } - if ((loop_limit--) <= 0) - break; - } + if (loop_limit <= 0) { + dev_warn(dev->class_dev, + "loop_limit reached in daqp_interrupt()\n"); + s->async->events |= COMEDI_CB_ERROR; + } - if (loop_limit <= 0) { - dev_warn(dev->class_dev, - "loop_limit reached in daqp_interrupt()\n"); - s->async->events |= COMEDI_CB_ERROR; - } + comedi_handle_events(dev, s); - comedi_handle_events(dev, s); - } return IRQ_HANDLED; } @@ -624,8 +612,6 @@ static int daqp_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s) if (ret) return ret; - devpriv->interrupt_mode = buffer; - /* Start conversion */ outb(DAQP_CMD_ARM | DAQP_CMD_FIFO_DATA, dev->iobase + DAQP_CMD_REG); -- 2.30.2