[PATCH] HID: cp2112: make the irqchip immutable

[PATCH] HID: cp2112: make the irqchip immutable

[Bartosz Golaszewski]

From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

This make the GPIO irqchip exposed by the CP2112 driver use an immutable
irq_chip struct thus addressing the following warning on probe:

  (cp2112_gpio): not an immutable chip, please consider fixing it!

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
---
 drivers/hid/hid-cp2112.c | 26 +++++++++++++++-----------
 1 file changed, 15 insertions(+), 11 deletions(-)

diff --git a/drivers/hid/hid-cp2112.c b/drivers/hid/hid-cp2112.c
index 27cadadda7c9..01f2a7211033 100644
--- a/drivers/hid/hid-cp2112.c
+++ b/drivers/hid/hid-cp2112.c
@@ -163,7 +163,6 @@ struct cp2112_device {
 	atomic_t read_avail;
 	atomic_t xfer_avail;
 	struct gpio_chip gc;
-	struct irq_chip irq;
 	u8 *in_out_buffer;
 	struct mutex lock;
 
@@ -1082,6 +1081,7 @@ static void cp2112_gpio_irq_mask(struct irq_data *d)
 	struct cp2112_device *dev = gpiochip_get_data(gc);
 
 	__clear_bit(d->hwirq, &dev->irq_mask);
+	gpiochip_disable_irq(gc, irqd_to_hwirq(d));
 }
 
 static void cp2112_gpio_irq_unmask(struct irq_data *d)
@@ -1089,6 +1089,7 @@ static void cp2112_gpio_irq_unmask(struct irq_data *d)
 	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 	struct cp2112_device *dev = gpiochip_get_data(gc);
 
+	gpiochip_enable_irq(gc, irqd_to_hwirq(d));
 	__set_bit(d->hwirq, &dev->irq_mask);
 }
 
@@ -1228,6 +1229,18 @@ static int __maybe_unused cp2112_allocate_irq(struct cp2112_device *dev,
 	return ret;
 }
 
+static const struct irq_chip cp2112_irq_chip = {
+	.name		= "cp2112-gpio",
+	.irq_startup	= cp2112_gpio_irq_startup,
+	.irq_shutdown	= cp2112_gpio_irq_shutdown,
+	.irq_ack	= cp2112_gpio_irq_ack,
+	.irq_mask	= cp2112_gpio_irq_mask,
+	.irq_unmask	= cp2112_gpio_irq_unmask,
+	.irq_set_type	= cp2112_gpio_irq_type,
+	.flags		= IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_IMMUTABLE,
+	GPIOCHIP_IRQ_RESOURCE_HELPERS,
+};
+
 static int cp2112_probe(struct hid_device *hdev, const struct hid_device_id *id)
 {
 	struct cp2112_device *dev;
@@ -1337,17 +1350,8 @@ static int cp2112_probe(struct hid_device *hdev, const struct hid_device_id *id)
 	dev->gc.can_sleep		= 1;
 	dev->gc.parent			= &hdev->dev;
 
-	dev->irq.name = "cp2112-gpio";
-	dev->irq.irq_startup = cp2112_gpio_irq_startup;
-	dev->irq.irq_shutdown = cp2112_gpio_irq_shutdown;
-	dev->irq.irq_ack = cp2112_gpio_irq_ack;
-	dev->irq.irq_mask = cp2112_gpio_irq_mask;
-	dev->irq.irq_unmask = cp2112_gpio_irq_unmask;
-	dev->irq.irq_set_type = cp2112_gpio_irq_type;
-	dev->irq.flags = IRQCHIP_MASK_ON_SUSPEND;
-
 	girq = &dev->gc.irq;
-	girq->chip = &dev->irq;
+	gpio_irq_chip_set_chip(girq, &cp2112_irq_chip);
 	/* The event comes from the outside so no parent handler */
 	girq->parent_handler = NULL;
 	girq->num_parents = 0;
-- 
2.39.2

Re: [PATCH] HID: cp2112: make the irqchip immutable

[Andy Shevchenko]

On Tue, Aug 22, 2023 at 05:22:44PM +0200, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
> 
> This make the GPIO irqchip exposed by the CP2112 driver use an immutable
> irq_chip struct thus addressing the following warning on probe:
> 
>   (cp2112_gpio): not an immutable chip, please consider fixing it!

https://git.kernel.org/pub/scm/linux/kernel/git/hid/hid.git/commit/?h=for-next&id=3e2977c425ad2789ca18084fff913cceacae75a2

Can you test HID for-next for this hardware?

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH] HID: cp2112: make the irqchip immutable

[Bartosz Golaszewski]

On Tue, Aug 22, 2023 at 5:28 PM Andy Shevchenko
<andriy.shevchenko@linux.intel.com> wrote:
>
> On Tue, Aug 22, 2023 at 05:22:44PM +0200, Bartosz Golaszewski wrote:
> > From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
> >
> > This make the GPIO irqchip exposed by the CP2112 driver use an immutable
> > irq_chip struct thus addressing the following warning on probe:
> >
> >   (cp2112_gpio): not an immutable chip, please consider fixing it!
>
> https://git.kernel.org/pub/scm/linux/kernel/git/hid/hid.git/commit/?h=for-next&id=3e2977c425ad2789ca18084fff913cceacae75a2
>
> Can you test HID for-next for this hardware?
>

Ah you beat me to it. I didn't see this one.

Bart

Re: [PATCH] HID: cp2112: make the irqchip immutable

[Andy Shevchenko]

On Tue, Aug 22, 2023 at 05:38:45PM +0200, Bartosz Golaszewski wrote:
> On Tue, Aug 22, 2023 at 5:28 PM Andy Shevchenko
> <andriy.shevchenko@linux.intel.com> wrote:
> > On Tue, Aug 22, 2023 at 05:22:44PM +0200, Bartosz Golaszewski wrote:
> > > From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
> > >
> > > This make the GPIO irqchip exposed by the CP2112 driver use an immutable
> > > irq_chip struct thus addressing the following warning on probe:
> > >
> > >   (cp2112_gpio): not an immutable chip, please consider fixing it!
> >
> > https://git.kernel.org/pub/scm/linux/kernel/git/hid/hid.git/commit/?h=for-next&id=3e2977c425ad2789ca18084fff913cceacae75a2
> >
> > Can you test HID for-next for this hardware?
> 
> Ah you beat me to it. I didn't see this one.

Now looking at it, I don't understand why I added a call to IRQ shutdown
callback... (Looks like it slipped from experimental patch.) If you can
test this, would be nice.

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH] HID: cp2112: make the irqchip immutable

[Bartosz Golaszewski]

On Tue, Aug 22, 2023 at 5:50 PM Andy Shevchenko
<andriy.shevchenko@linux.intel.com> wrote:
>
> On Tue, Aug 22, 2023 at 05:38:45PM +0200, Bartosz Golaszewski wrote:
> > On Tue, Aug 22, 2023 at 5:28 PM Andy Shevchenko
> > <andriy.shevchenko@linux.intel.com> wrote:
> > > On Tue, Aug 22, 2023 at 05:22:44PM +0200, Bartosz Golaszewski wrote:
> > > > From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
> > > >
> > > > This make the GPIO irqchip exposed by the CP2112 driver use an immutable
> > > > irq_chip struct thus addressing the following warning on probe:
> > > >
> > > >   (cp2112_gpio): not an immutable chip, please consider fixing it!
> > >
> > > https://git.kernel.org/pub/scm/linux/kernel/git/hid/hid.git/commit/?h=for-next&id=3e2977c425ad2789ca18084fff913cceacae75a2
> > >
> > > Can you test HID for-next for this hardware?
> >
> > Ah you beat me to it. I didn't see this one.
>
> Now looking at it, I don't understand why I added a call to IRQ shutdown
> callback... (Looks like it slipped from experimental patch.) If you can
> test this, would be nice.
>

Yeah it works alright.

It's already in next but FWIW:

Tested-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

Re: [PATCH] HID: cp2112: make the irqchip immutable

[Linus Walleij]

On Tue, Aug 22, 2023 at 5:22 PM Bartosz Golaszewski <brgl@bgdev.pl> wrote:

> From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
>
> This make the GPIO irqchip exposed by the CP2112 driver use an immutable
> irq_chip struct thus addressing the following warning on probe:
>
>   (cp2112_gpio): not an immutable chip, please consider fixing it!
>
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

Thanks for fixing this. FWIW:
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>

Marc Z, have you checked how we stand with immutable GPIO
irqchips? We should be able to smoke it out to default behaviour
soon I think.

Yours,
Linus Walleij

Re: [PATCH] HID: cp2112: make the irqchip immutable

[Marc Zyngier]

On Wed, 23 Aug 2023 13:14:59 +0100,
Linus Walleij <linus.walleij@linaro.org> wrote:
> 
> On Tue, Aug 22, 2023 at 5:22 PM Bartosz Golaszewski <brgl@bgdev.pl> wrote:
> 
> > From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
> >
> > This make the GPIO irqchip exposed by the CP2112 driver use an immutable
> > irq_chip struct thus addressing the following warning on probe:
> >
> >   (cp2112_gpio): not an immutable chip, please consider fixing it!
> >
> > Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
> 
> Thanks for fixing this. FWIW:
> Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
> 
> Marc Z, have you checked how we stand with immutable GPIO
> irqchips? We should be able to smoke it out to default behaviour
> soon I think.

I haven't recently checked, but I'm still in favour of actively
make the new behaviour the only one supported. The sooner we break
things, the better...

	M.

-- 
Without deviation from the norm, progress is not possible.