[10/21] gpiolib: replace find_chip_by_name() with gpio_device_find_by_label()

Commit Message

Bartosz Golaszewski Sept. 5, 2023, 6:52 p.m. UTC

From: Bartosz Golaszewski <[e-mail]>

Remove all remaining uses of find_chip_by_name() (and subsequently:
gpiochip_find()) from gpiolib.c and use the new
gpio_device_find_by_label() instead.

Signed-off-by: Bartosz Golaszewski <[e-mail]>
---
 drivers/gpio/gpiolib.c | 36 ++++++++++++------------------------
 1 file changed, 12 insertions(+), 24 deletions(-)

Comments

Andy Shevchenko Sept. 6, 2023, 2:23 p.m. UTC | #1

On Tue, Sep 05, 2023 at 08:52:58PM +0200, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <[e-mail]>
> 
> Remove all remaining uses of find_chip_by_name() (and subsequently:
> gpiochip_find()) from gpiolib.c and use the new
> gpio_device_find_by_label() instead.

...

> -		desc = gpiochip_get_desc(gc, p->chip_hwnum);
> +		desc = gpiochip_get_desc(gdev->chip, p->chip_hwnum);

Why not gpio_device_get_desc()?

Linus Walleij Sept. 7, 2023, 7:20 a.m. UTC | #2

On Tue, Sep 5, 2023 at 8:53 PM Bartosz Golaszewski <[e-mail]> wrote:

> From: Bartosz Golaszewski <[e-mail]>
>
> Remove all remaining uses of find_chip_by_name() (and subsequently:
> gpiochip_find()) from gpiolib.c and use the new
> gpio_device_find_by_label() instead.
>
> Signed-off-by: Bartosz Golaszewski <[e-mail]>

With Andy's comment addressed:
Reviewed-by: Linus Walleij <[e-mail]>

Yours,
Linus Walleij

Patch

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 408f8a7753f9..90e8c3d8b6f6 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1161,18 +1161,6 @@  struct gpio_device *gpio_device_find_by_label(const char *label)
 }
 EXPORT_SYMBOL_GPL(gpio_device_find_by_label);
 
-static int gpiochip_match_name(struct gpio_chip *gc, void *data)
-{
-	const char *name = data;
-
-	return !strcmp(gc->label, name);
-}
-
-static struct gpio_chip *find_chip_by_name(const char *name)
-{
-	return gpiochip_find((void *)name, gpiochip_match_name);
-}
-
 /**
  * gpio_device_get() - Increase the reference count of this GPIO device
  * @gdev: GPIO device to increase the refcount for
@@ -3924,21 +3912,22 @@  EXPORT_SYMBOL_GPL(gpiod_remove_lookup_table);
  */
 void gpiod_add_hogs(struct gpiod_hog *hogs)
 {
-	struct gpio_chip *gc;
 	struct gpiod_hog *hog;
 
 	mutex_lock(&gpio_machine_hogs_mutex);
 
 	for (hog = &hogs[0]; hog->chip_label; hog++) {
+		struct gpio_device *gdev __free(gpio_device_put) = NULL;
+
 		list_add_tail(&hog->list, &gpio_machine_hogs);
 
 		/*
 		 * The chip may have been registered earlier, so check if it
 		 * exists and, if so, try to hog the line now.
 		 */
-		gc = find_chip_by_name(hog->chip_label);
-		if (gc)
-			gpiochip_machine_hog(gc, hog);
+		gdev = gpio_device_find_by_label(hog->chip_label);
+		if (gdev)
+			gpiochip_machine_hog(gdev->chip, hog);
 	}
 
 	mutex_unlock(&gpio_machine_hogs_mutex);
@@ -3999,7 +3988,7 @@  static struct gpio_desc *gpiod_find(struct device *dev, const char *con_id,
 		return desc;
 
 	for (p = &table->table[0]; p->key; p++) {
-		struct gpio_chip *gc;
+		struct gpio_device *gdev __free(gpio_device_put) = NULL;
 
 		/* idx must always match exactly */
 		if (p->idx != idx)
@@ -4021,9 +4010,8 @@  static struct gpio_desc *gpiod_find(struct device *dev, const char *con_id,
 			return ERR_PTR(-EPROBE_DEFER);
 		}
 
-		gc = find_chip_by_name(p->key);
-
-		if (!gc) {
+		gdev = gpio_device_find_by_label(p->key);
+		if (!gdev) {
 			/*
 			 * As the lookup table indicates a chip with
 			 * p->key should exist, assume it may
@@ -4036,15 +4024,15 @@  static struct gpio_desc *gpiod_find(struct device *dev, const char *con_id,
 			return ERR_PTR(-EPROBE_DEFER);
 		}
 
-		if (gc->ngpio <= p->chip_hwnum) {
+		if (gdev->chip->ngpio <= p->chip_hwnum) {
 			dev_err(dev,
 				"requested GPIO %u (%u) is out of range [0..%u] for chip %s\n",
-				idx, p->chip_hwnum, gc->ngpio - 1,
-				gc->label);
+				idx, p->chip_hwnum, gdev->chip->ngpio - 1,
+				gdev->chip->label);
 			return ERR_PTR(-EINVAL);
 		}
 
-		desc = gpiochip_get_desc(gc, p->chip_hwnum);
+		desc = gpiochip_get_desc(gdev->chip, p->chip_hwnum);
 		*flags = p->flags;
 
 		return desc;