static void wm831x_gpio_dbg_show()

in gpio-wm831x.c [154:241]

• 72 lines of code
• 20 McCabe index (conditional complexity)

static void wm831x_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
{
	struct wm831x_gpio *wm831x_gpio = gpiochip_get_data(chip);
	struct wm831x *wm831x = wm831x_gpio->wm831x;
	int i, tristated;

	for (i = 0; i < chip->ngpio; i++) {
		int gpio = i + chip->base;
		int reg;
		const char *label, *pull, *powerdomain;

		/* We report the GPIO even if it's not requested since
		 * we're also reporting things like alternate
		 * functions which apply even when the GPIO is not in
		 * use as a GPIO.
		 */
		label = gpiochip_is_requested(chip, i);
		if (!label)
			label = "Unrequested";

		seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, label);

		reg = wm831x_reg_read(wm831x, WM831X_GPIO1_CONTROL + i);
		if (reg < 0) {
			dev_err(wm831x->dev,
				"GPIO control %d read failed: %d\n",
				gpio, reg);
			seq_putc(s, '\n');
			continue;
		}

		switch (reg & WM831X_GPN_PULL_MASK) {
		case WM831X_GPIO_PULL_NONE:
			pull = "nopull";
			break;
		case WM831X_GPIO_PULL_DOWN:
			pull = "pulldown";
			break;
		case WM831X_GPIO_PULL_UP:
			pull = "pullup";
			break;
		default:
			pull = "INVALID PULL";
			break;
		}

		switch (i + 1) {
		case 1 ... 3:
		case 7 ... 9:
			if (reg & WM831X_GPN_PWR_DOM)
				powerdomain = "VPMIC";
			else
				powerdomain = "DBVDD";
			break;

		case 4 ... 6:
		case 10 ... 12:
			if (reg & WM831X_GPN_PWR_DOM)
				powerdomain = "SYSVDD";
			else
				powerdomain = "DBVDD";
			break;

		case 13 ... 16:
			powerdomain = "TPVDD";
			break;

		default:
			BUG();
			break;
		}

		tristated = reg & WM831X_GPN_TRI;
		if (wm831x->has_gpio_ena)
			tristated = !tristated;

		seq_printf(s, " %s %s %s %s%s\n"
			   "                                  %s%s (0x%4x)\n",
			   reg & WM831X_GPN_DIR ? "in" : "out",
			   wm831x_gpio_get(chip, i) ? "high" : "low",
			   pull,
			   powerdomain,
			   reg & WM831X_GPN_POL ? "" : " inverted",
			   reg & WM831X_GPN_OD ? "open-drain" : "push-pull",
			   tristated ? " tristated" : "",
			   reg);
	}
}