linux-kernel - [PATCH v2 3/5] gpiolib: Refactor gpiolib_dbg_show() with help of for_each_gpio

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Date:   Fri,  8 Apr 2022 21:18:52 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH v2 3/5] gpiolib: Refactor gpiolib_dbg_show() with help of for_each_gpio_desc()

Use for_each_gpio_desc() and since we would need to touch the entire
conditionals, do the following:
- rename last occurrence of gdesc to desc
- use short ternary operator ?:
- join two seq_printf() calls into single one
- fix indentation of the seq_printf() parameters

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
v2: rebased on patch 1
 drivers/gpio/gpiolib.c | 38 ++++++++++++++++++--------------------
 1 file changed, 18 insertions(+), 20 deletions(-)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 58a57540b834..43b0cae69bcd 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -4394,34 +4394,32 @@ core_initcall(gpiolib_dev_init);
 
 static void gpiolib_dbg_show(struct seq_file *s, struct gpio_device *gdev)
 {
-	unsigned		i;
 	struct gpio_chip	*gc = gdev->chip;
+	struct gpio_desc	*desc;
 	unsigned		gpio = gdev->base;
-	struct gpio_desc	*gdesc = &gdev->descs[0];
+	int			value;
 	bool			is_out;
 	bool			is_irq;
 	bool			active_low;
 
-	for (i = 0; i < gdev->ngpio; i++, gpio++, gdesc++) {
-		if (!test_bit(FLAG_REQUESTED, &gdesc->flags)) {
-			if (gdesc->name) {
-				seq_printf(s, " gpio-%-3d (%-20.20s)\n",
-					   gpio, gdesc->name);
-			}
-			continue;
+	for_each_gpio_desc(gc, desc) {
+		if (test_bit(FLAG_REQUESTED, &desc->flags)) {
+			gpiod_get_direction(desc);
+			is_out = test_bit(FLAG_IS_OUT, &desc->flags);
+			value = gc->get ? gc->get(gc, gpio_chip_hwgpio(desc)) : -EIO;
+			is_irq = test_bit(FLAG_USED_AS_IRQ, &desc->flags);
+			active_low = test_bit(FLAG_ACTIVE_LOW, &desc->flags);
+			seq_printf(s, " gpio-%-3d (%-20.20s|%-20.20s) %s %s %s%s\n",
+				   gpio, desc->name ?: "", desc->label,
+				   is_out ? "out" : "in ",
+				   value >= 0 ? (value ? "hi" : "lo") : "?  ",
+				   is_irq ? "IRQ " : "",
+				   active_low ? "ACTIVE LOW" : "");
+		} else if (desc->name) {
+			seq_printf(s, " gpio-%-3d (%-20.20s)\n", gpio, desc->name);
 		}
 
-		gpiod_get_direction(gdesc);
-		is_out = test_bit(FLAG_IS_OUT, &gdesc->flags);
-		is_irq = test_bit(FLAG_USED_AS_IRQ, &gdesc->flags);
-		active_low = test_bit(FLAG_ACTIVE_LOW, &gdesc->flags);
-		seq_printf(s, " gpio-%-3d (%-20.20s|%-20.20s) %s %s %s%s",
-			gpio, gdesc->name ? gdesc->name : "", gdesc->label,
-			is_out ? "out" : "in ",
-			gc->get ? (gc->get(gc, i) ? "hi" : "lo") : "?  ",
-			is_irq ? "IRQ " : "",
-			active_low ? "ACTIVE LOW" : "");
-		seq_printf(s, "\n");
+		gpio++;
 	}
 }
 
-- 
2.35.1