LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Jonathan Cameron <jic23@kernel.org>
To: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Lars-Peter Clausen <lars@metafoo.de>,
	Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
	linux-iio@vger.kernel.org, <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 15/16] iio: adc: max1027: Support software triggers
Date: Mon, 30 Aug 2021 11:50:46 +0100	[thread overview]
Message-ID: <20210830115046.3727ccc4@jic23-huawei> (raw)
In-Reply-To: <20210818111139.330636-16-miquel.raynal@bootlin.com>

On Wed, 18 Aug 2021 13:11:38 +0200
Miquel Raynal <miquel.raynal@bootlin.com> wrote:

> Now that max1027_trigger_handler() has been freed from handling hardware
> triggers EOC situations, we can use it for what it has been designed in
> the first place: trigger software originated conversions.

As mentioned earlier, this is not how I'd normally expect this sort of
case to be handled. I'd be expecting the cnvst trigger to still be calling
this function and the function to do the relevant check to ensure it
knows the data is already available in that case.

> In other
> words, when userspace initiates a conversion with a sysfs trigger or a
> hrtimer trigger, we must do all configuration steps, ie:
> 1- Configuring the trigger
> 2- Configuring the channels to scan
> 3- Starting the conversion (actually done automatically by step 2 in
>    this case)
> 4- Waiting for the conversion to end
> 5- Retrieving the data from the ADC
> 6- Push the data to the IIO core and notify it
> 
> Add the missing steps to this helper and drop the trigger verification
> hook otherwise software triggers would simply not be accepted at all.
> 
> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
> ---
>  drivers/iio/adc/max1027.c | 26 ++++++++++++++------------
>  1 file changed, 14 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/iio/adc/max1027.c b/drivers/iio/adc/max1027.c
> index 8c5995ae59f2..bb437e43adaf 100644
> --- a/drivers/iio/adc/max1027.c
> +++ b/drivers/iio/adc/max1027.c
> @@ -413,17 +413,6 @@ static int max1027_debugfs_reg_access(struct iio_dev *indio_dev,
>  	return spi_write(st->spi, val, 1);
>  }
>  
> -static int max1027_validate_trigger(struct iio_dev *indio_dev,
> -				    struct iio_trigger *trig)
> -{
> -	struct max1027_state *st = iio_priv(indio_dev);
> -
> -	if (st->trig != trig)
> -		return -EINVAL;
> -
> -	return 0;
> -}
> -
>  static int max1027_set_cnvst_trigger_state(struct iio_trigger *trig, bool state)
>  {
>  	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
> @@ -512,7 +501,21 @@ static irqreturn_t max1027_trigger_handler(int irq, void *private)
>  
>  	pr_debug("%s(irq=%d, private=0x%p)\n", __func__, irq, private);
>  
> +	ret = max1027_configure_trigger(indio_dev);

I'd not expect to see this ever time.  The configuration shouldn't change
from one call of this function to the next.

> +	if (ret)
> +		goto out;
> +
> +	ret = max1027_configure_chans_to_scan(indio_dev);

This should also not change unless it is also responsible for the 'go' signal.
If that's true then it is badly named.

> +	if (ret)
> +		goto out;
> +
> +	ret = max1027_wait_eoc(indio_dev);
> +	if (ret)
> +		goto out;
> +
>  	ret = max1027_read_scan(indio_dev);
> +
> +out:
>  	if (ret)
>  		dev_err(&indio_dev->dev,
>  			"Cannot read scanned values (%d)\n", ret);
> @@ -529,7 +532,6 @@ static const struct iio_trigger_ops max1027_trigger_ops = {
>  
>  static const struct iio_info max1027_info = {
>  	.read_raw = &max1027_read_raw,
> -	.validate_trigger = &max1027_validate_trigger,
>  	.debugfs_reg_access = &max1027_debugfs_reg_access,
>  };
>  


  parent reply	other threads:[~2021-08-30 10:47 UTC|newest]

Thread overview: 71+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-18 11:11 [PATCH 00/16] Bring software triggers support to MAX1027-like ADCs Miquel Raynal
2021-08-18 11:11 ` [PATCH 01/16] iio: adc: max1027: Fix wrong shift with 12-bit devices Miquel Raynal
2021-08-20  7:02   ` Sa, Nuno
2021-08-30  9:57     ` Jonathan Cameron
2021-08-18 11:11 ` [PATCH 02/16] iio: adc: max1027: Fix the number of max1X31 channels Miquel Raynal
2021-08-20  7:03   ` Sa, Nuno
2021-08-30 10:00     ` Jonathan Cameron
2021-08-18 11:11 ` [PATCH 03/16] iio: adc: max1027: Push only the requested samples Miquel Raynal
2021-08-20  7:10   ` Sa, Nuno
2021-08-30 10:07     ` Jonathan Cameron
2021-08-30 10:49       ` Sa, Nuno
2021-08-30 14:29         ` Jonathan Cameron
2021-08-30 15:02           ` Sa, Nuno
2021-09-01  8:12             ` Miquel Raynal
2021-09-04 14:06               ` Jonathan Cameron
2021-09-06  8:59               ` Sa, Nuno
2021-09-06 16:56                 ` Jonathan Cameron
2021-09-06 17:34                   ` Miquel Raynal
2021-08-30 10:06   ` Jonathan Cameron
2021-08-18 11:11 ` [PATCH 04/16] iio: adc: max1027: Lower conversion time Miquel Raynal
2021-08-20  7:12   ` Sa, Nuno
2021-08-30 10:10   ` Jonathan Cameron
2021-08-18 11:11 ` [PATCH 05/16] iio: adc: max1027: Drop extra warning message Miquel Raynal
2021-08-20  7:12   ` Sa, Nuno
2021-08-30 10:12   ` Jonathan Cameron
2021-08-18 11:11 ` [PATCH 06/16] iio: adc: max1027: Rename a helper Miquel Raynal
2021-08-20  7:13   ` Sa, Nuno
2021-08-18 11:11 ` [PATCH 07/16] iio: adc: max1027: Create a helper to configure the trigger Miquel Raynal
2021-08-20  7:16   ` Sa, Nuno
2021-08-30 10:16   ` Jonathan Cameron
2021-08-18 11:11 ` [PATCH 08/16] iio: adc: max1027: Explain better how the trigger state gets changed Miquel Raynal
2021-08-20  7:17   ` Sa, Nuno
2021-08-18 11:11 ` [PATCH 09/16] iio: adc: max1027: Create a helper to configure the channels to scan Miquel Raynal
2021-08-20  7:18   ` Sa, Nuno
2021-08-18 11:11 ` [PATCH 10/16] iio: adc: max1027: Prevent single channel accesses during buffer reads Miquel Raynal
2021-08-20  7:20   ` Sa, Nuno
2021-08-20  7:30     ` Sa, Nuno
2021-08-30 10:20       ` Jonathan Cameron
2021-09-02  8:56         ` Miquel Raynal
2021-08-18 11:11 ` [PATCH 11/16] iio: adc: max1027: Separate the IRQ handler from the read logic Miquel Raynal
2021-08-20  7:23   ` Sa, Nuno
2021-09-02  8:55     ` Miquel Raynal
2021-09-04 14:08       ` Jonathan Cameron
2021-08-18 11:11 ` [PATCH 12/16] iio: adc: max1027: Introduce an end of conversion helper Miquel Raynal
2021-08-20  7:28   ` Sa, Nuno
2021-09-02  9:26     ` Miquel Raynal
2021-08-30 10:34   ` Jonathan Cameron
2021-08-18 11:11 ` [PATCH 13/16] iio: adc: max1027: Prepare re-using the EOC interrupt Miquel Raynal
2021-08-20  7:31   ` Sa, Nuno
2021-08-30 10:30   ` Jonathan Cameron
2021-08-30 10:47   ` Jonathan Cameron
2021-08-18 11:11 ` [PATCH 14/16] iio: adc: max1027: Consolidate the end of conversion helper Miquel Raynal
2021-08-20  7:45   ` Sa, Nuno
2021-08-30 10:37   ` Jonathan Cameron
2021-08-30 12:44     ` Sa, Nuno
2021-08-30 14:32       ` Jonathan Cameron
2021-09-02 15:12       ` Miquel Raynal
2021-09-03 14:28         ` Sa, Nuno
2021-09-03 14:46           ` Miquel Raynal
2021-09-05  9:41             ` Jonathan Cameron
2021-09-06  9:12               ` Sa, Nuno
2021-09-06  9:30                 ` Sa, Nuno
2021-08-18 11:11 ` [PATCH 15/16] iio: adc: max1027: Support software triggers Miquel Raynal
2021-08-20  7:58   ` Sa, Nuno
2021-09-02 12:25     ` Miquel Raynal
2021-09-03 14:20       ` Sa, Nuno
2021-08-30 10:50   ` Jonathan Cameron [this message]
2021-09-02 15:21     ` Miquel Raynal
2021-09-05  9:43       ` Jonathan Cameron
2021-08-18 11:11 ` [PATCH 16/16] iio: adc: max1027: Enable software triggers to be used without IRQ Miquel Raynal
2021-08-30 10:54   ` Jonathan Cameron

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210830115046.3727ccc4@jic23-huawei \
    --to=jic23@kernel.org \
    --cc=lars@metafoo.de \
    --cc=linux-iio@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=miquel.raynal@bootlin.com \
    --cc=thomas.petazzoni@bootlin.com \
    --subject='Re: [PATCH 15/16] iio: adc: max1027: Support software triggers' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).