From: Miquel Raynal <miquel.raynal@bootlin.com>
To: "Sa, Nuno" <Nuno.Sa@analog.com>
Cc: Jonathan Cameron <jic23@kernel.org>,
Lars-Peter Clausen <lars@metafoo.de>,
Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
"linux-iio@vger.kernel.org" <linux-iio@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 15/16] iio: adc: max1027: Support software triggers
Date: Thu, 2 Sep 2021 14:25:26 +0200 [thread overview]
Message-ID: <20210902142526.55fca207@xps13> (raw)
In-Reply-To: <SJ0PR03MB63594E162F7246874CD1A72599C19@SJ0PR03MB6359.namprd03.prod.outlook.com>
Hi Nuno,
"Sa, Nuno" <Nuno.Sa@analog.com> wrote on Fri, 20 Aug 2021 07:58:25
+0000:
> > -----Original Message-----
> > From: Miquel Raynal <miquel.raynal@bootlin.com>
> > Sent: Wednesday, August 18, 2021 1:12 PM
> > To: Jonathan Cameron <jic23@kernel.org>; Lars-Peter Clausen
> > <lars@metafoo.de>
> > Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>; linux-
> > iio@vger.kernel.org; linux-kernel@vger.kernel.org; Miquel Raynal
> > <miquel.raynal@bootlin.com>
> > Subject: [PATCH 15/16] iio: adc: max1027: Support software triggers
> >
> > [External]
> >
> > 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. 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);
> > + if (ret)
> > + goto out;
> > +
> > + ret = max1027_configure_chans_to_scan(indio_dev);
> > + if (ret)
> > + goto out;
> > +
> > + ret = max1027_wait_eoc(indio_dev);
> > + if (ret)
> > + goto out;
> > +
> > ret = max1027_read_scan(indio_dev);
>
> There's something that I'm not getting... How are we checking that
> we have software triggers? This API is called only if the device
> allocates it's own trigger which will happen if there's a spi IRQ.
>
> I'm probably missing something as this series is fairly big but the way
> I would do it is (in the probe):
>
> - always call 'devm_iio_triggered_buffer_setup()' function and properly use
> buffer ops [1] (for example, you can use 'validate_scan_mask()' to setup the
> channels to read);
> - only allocate a trigger if an IRQ is present in which case, we assume HW
> triggering is supported.
I think these are the exact steps that are enforced in the next patch,
I can squash them if you wish but I think it makes sense to have it in
two steps.
Thanks,
Miquèl
next prev parent reply other threads:[~2021-09-02 12:25 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 [this message]
2021-09-03 14:20 ` Sa, Nuno
2021-08-30 10:50 ` Jonathan Cameron
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
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