linux-kernel - [PATCH] HID: cp2112: make the irqchip immutable

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Message-Id: <20230822152244.214394-1-brgl@bgdev.pl>
Date:   Tue, 22 Aug 2023 17:22:44 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>
Cc:     linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-input@...r.kernel.org,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH] HID: cp2112: make the irqchip immutable

From: Bartosz Golaszewski <bartosz.golaszewski@...aro.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@...aro.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