linux-kernel - [PATCH] HID: cp2112: Remove some dead code

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Message-Id: <6ee2132c415db2fc90e7fa2106db427a914cc566.1655563907.git.christophe.jaillet@wanadoo.fr>
Date:   Sat, 18 Jun 2022 16:52:12 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        linux-input@...r.kernel.org
Subject: [PATCH] HID: cp2112: Remove some dead code

Commit 13de9cca514e ("HID: cp2112: add IRQ chip handling") has introduced
cp2112_allocate_irq() that seems to be unused since 2016.

Remove it, remove the associated resources and part of the remove()
function that frees the resources allocated in cp2112_allocate_irq().

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
Compile tested only.

Maybe the issue is completely elsewhere and the probe() should call
cp2112_allocate_irq() in some cases.
---
 drivers/hid/hid-cp2112.c | 52 ----------------------------------------
 1 file changed, 52 deletions(-)

diff --git a/drivers/hid/hid-cp2112.c b/drivers/hid/hid-cp2112.c
index 1e16b0fa310d..67a5ac6be922 100644
--- a/drivers/hid/hid-cp2112.c
+++ b/drivers/hid/hid-cp2112.c
@@ -167,7 +167,6 @@ struct cp2112_device {
 	u8 *in_out_buffer;
 	struct mutex lock;
 
-	struct gpio_desc *desc[8];
 	bool gpio_poll;
 	struct delayed_work gpio_poll_worker;
 	unsigned long irq_mask;
@@ -1183,51 +1182,6 @@ static int cp2112_gpio_irq_type(struct irq_data *d, unsigned int type)
 	return 0;
 }
 
-static int __maybe_unused cp2112_allocate_irq(struct cp2112_device *dev,
-					      int pin)
-{
-	int ret;
-
-	if (dev->desc[pin])
-		return -EINVAL;
-
-	dev->desc[pin] = gpiochip_request_own_desc(&dev->gc, pin,
-						   "HID/I2C:Event",
-						   GPIO_ACTIVE_HIGH,
-						   GPIOD_IN);
-	if (IS_ERR(dev->desc[pin])) {
-		dev_err(dev->gc.parent, "Failed to request GPIO\n");
-		return PTR_ERR(dev->desc[pin]);
-	}
-
-	ret = cp2112_gpio_direction_input(&dev->gc, pin);
-	if (ret < 0) {
-		dev_err(dev->gc.parent, "Failed to set GPIO to input dir\n");
-		goto err_desc;
-	}
-
-	ret = gpiochip_lock_as_irq(&dev->gc, pin);
-	if (ret) {
-		dev_err(dev->gc.parent, "Failed to lock GPIO as interrupt\n");
-		goto err_desc;
-	}
-
-	ret = gpiod_to_irq(dev->desc[pin]);
-	if (ret < 0) {
-		dev_err(dev->gc.parent, "Failed to translate GPIO to IRQ\n");
-		goto err_lock;
-	}
-
-	return ret;
-
-err_lock:
-	gpiochip_unlock_as_irq(&dev->gc, pin);
-err_desc:
-	gpiochip_free_own_desc(dev->desc[pin]);
-	dev->desc[pin] = NULL;
-	return ret;
-}
-
 static int cp2112_probe(struct hid_device *hdev, const struct hid_device_id *id)
 {
 	struct cp2112_device *dev;
@@ -1388,7 +1342,6 @@ static int cp2112_probe(struct hid_device *hdev, const struct hid_device_id *id)
 static void cp2112_remove(struct hid_device *hdev)
 {
 	struct cp2112_device *dev = hid_get_drvdata(hdev);
-	int i;
 
 	sysfs_remove_group(&hdev->dev.kobj, &cp2112_attr_group);
 	i2c_del_adapter(&dev->adap);
@@ -1398,11 +1351,6 @@ static void cp2112_remove(struct hid_device *hdev)
 		cancel_delayed_work_sync(&dev->gpio_poll_worker);
 	}
 
-	for (i = 0; i < ARRAY_SIZE(dev->desc); i++) {
-		gpiochip_unlock_as_irq(&dev->gc, i);
-		gpiochip_free_own_desc(dev->desc[i]);
-	}
-
 	gpiochip_remove(&dev->gc);
 	/* i2c_del_adapter has finished removing all i2c devices from our
 	 * adapter. Well behaved devices should no longer call our cp2112_xfer
-- 
2.34.1