linux-kernel - Re: [PATCH 1/3] staging: comedi: addi_apci_1564: add a subdevice for Change-of-State interrupt support

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Message-ID: <5384BE84.6060209@mev.co.uk>
Date:	Tue, 27 May 2014 17:34:12 +0100
From:	Ian Abbott <abbotti@....co.uk>
To:	Chase Southwood <chase.southwood@...il.com>,
	<gregkh@...uxfoundation.org>
CC:	<hsweeten@...ionengravers.com>, <devel@...verdev.osuosl.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] staging: comedi: addi_apci_1564: add a subdevice
 for Change-of-State interrupt support

On 2014-05-24 23:24, Chase Southwood wrote:
> This board supports an interrupt that can be generated by an AND/OR
> combination of 16 of the input channels.
>
> Create a separate subdevice to handle this interrupt.
>
> In doing this, this patch moves the apci1564_di_config() operation from
> the digital input subdevice to this new subdevice, and also renames it to
> make it more apparent that it is the config operation for the COS interrupt.
>
> Signed-off-by: Chase Southwood <chase.southwood@...il.com>
> Cc: Ian Abbott <abbotti@....co.uk>
> Cc: H Hartley Sweeten <hsweeten@...ionengravers.com>
> ---
>   .../staging/comedi/drivers/addi-data/hwdrv_apci1564.c  |  8 ++++----
>   drivers/staging/comedi/drivers/addi_apci_1564.c        | 18 ++++++++++++++++--
>   2 files changed, 20 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/staging/comedi/drivers/addi-data/hwdrv_apci1564.c b/drivers/staging/comedi/drivers/addi-data/hwdrv_apci1564.c
> index 0ba5385..a38ccf9 100644
> --- a/drivers/staging/comedi/drivers/addi-data/hwdrv_apci1564.c
> +++ b/drivers/staging/comedi/drivers/addi-data/hwdrv_apci1564.c
> @@ -101,10 +101,10 @@ static unsigned int ui_InterruptData, ui_Type;
>    * data[2] Interrupt mask for the mode 1
>    * data[3] Interrupt mask for the mode 2
>    */
> -static int apci1564_di_config(struct comedi_device *dev,
> -			      struct comedi_subdevice *s,
> -			      struct comedi_insn *insn,
> -			      unsigned int *data)
> +static int apci1564_cos_insn_config(struct comedi_device *dev,
> +				    struct comedi_subdevice *s,
> +				    struct comedi_insn *insn,
> +				    unsigned int *data)

Since the original insn_config routine for the "DI" subdevice was quite 
"bespoke" shall we say, I don't think it's worth adopting it "as is" for 
the "COS" subdevice.  Better just to remove it until it can be 
implemented properly.

>   {
>   	struct addi_private *devpriv = dev->private;
>
> diff --git a/drivers/staging/comedi/drivers/addi_apci_1564.c b/drivers/staging/comedi/drivers/addi_apci_1564.c
> index 13d9962..6af1e4c 100644
> --- a/drivers/staging/comedi/drivers/addi_apci_1564.c
> +++ b/drivers/staging/comedi/drivers/addi_apci_1564.c
> @@ -105,7 +105,7 @@ static int apci1564_auto_attach(struct comedi_device *dev,
>   			dev->irq = pcidev->irq;
>   	}
>
> -	ret = comedi_alloc_subdevices(dev, 3);
> +	ret = comedi_alloc_subdevices(dev, 4);
>   	if (ret)
>   		return ret;
>
> @@ -117,7 +117,6 @@ static int apci1564_auto_attach(struct comedi_device *dev,
>   	s->maxdata = 1;
>   	s->len_chanlist = 32;
>   	s->range_table = &range_digital;
> -	s->insn_config = apci1564_di_config;
>   	s->insn_bits = apci1564_di_insn_bits;
>
>   	/*  Allocate and Initialise DO Subdevice Structures */
> @@ -144,6 +143,21 @@ static int apci1564_auto_attach(struct comedi_device *dev,
>   	s->insn_read = apci1564_timer_read;
>   	s->insn_config = apci1564_timer_config;
>
> +	/* Change-Of-State (COS) interrupt subdevice */
> +	s = &dev->subdevices[3];
> +	if (dev->irq) {
> +		dev->read_subdev = s;
> +		s->type = COMEDI_SUBD_DI;
> +		s->subdev_flags = SDF_READABLE | SDF_CMD_READ;
> +		s->n_chan = 1;
> +		s->maxdata = 1;
> +		s->len_chanlist = 1;
> +		s->range_table = &range_digital;
> +		s->insn_config = apci1564_cos_insn_config;

It would be nice to have an 'insn_bits' routine, even if the routine 
just gives back a dummy data value for now.

> +	} else {
> +		s->type = COMEDI_SUBD_UNUSED;
> +	}
> +
>   	return 0;
>   }
>
>


-- 
-=( Ian Abbott @ MEV Ltd.    E-mail: <abbotti@....co.uk>        )=-
-=( Tel: +44 (0)161 477 1898   FAX: +44 (0)161 718 3587         )=-
--
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