static int __init panel_init_module()

in panel.c [1619:1729]

• 83 lines of code
• 21 McCabe index (conditional complexity)

static int __init panel_init_module(void)
{
	int selected_keypad_type = NOT_SET, err;

	/* take care of an eventual profile */
	switch (profile) {
	case PANEL_PROFILE_CUSTOM:
		/* custom profile */
		selected_keypad_type = DEFAULT_KEYPAD_TYPE;
		selected_lcd_type = DEFAULT_LCD_TYPE;
		break;
	case PANEL_PROFILE_OLD:
		/* 8 bits, 2*16, old keypad */
		selected_keypad_type = KEYPAD_TYPE_OLD;
		selected_lcd_type = LCD_TYPE_OLD;

		/* TODO: This two are a little hacky, sort it out later */
		if (lcd_width == NOT_SET)
			lcd_width = 16;
		if (lcd_hwidth == NOT_SET)
			lcd_hwidth = 16;
		break;
	case PANEL_PROFILE_NEW:
		/* serial, 2*16, new keypad */
		selected_keypad_type = KEYPAD_TYPE_NEW;
		selected_lcd_type = LCD_TYPE_KS0074;
		break;
	case PANEL_PROFILE_HANTRONIX:
		/* 8 bits, 2*16 hantronix-like, no keypad */
		selected_keypad_type = KEYPAD_TYPE_NONE;
		selected_lcd_type = LCD_TYPE_HANTRONIX;
		break;
	case PANEL_PROFILE_NEXCOM:
		/* generic 8 bits, 2*16, nexcom keypad, eg. Nexcom. */
		selected_keypad_type = KEYPAD_TYPE_NEXCOM;
		selected_lcd_type = LCD_TYPE_NEXCOM;
		break;
	case PANEL_PROFILE_LARGE:
		/* 8 bits, 2*40, old keypad */
		selected_keypad_type = KEYPAD_TYPE_OLD;
		selected_lcd_type = LCD_TYPE_OLD;
		break;
	}

	/*
	 * Overwrite selection with module param values (both keypad and lcd),
	 * where the deprecated params have lower prio.
	 */
	if (keypad_enabled != NOT_SET)
		selected_keypad_type = keypad_enabled;
	if (keypad_type != NOT_SET)
		selected_keypad_type = keypad_type;

	keypad.enabled = (selected_keypad_type > 0);

	if (lcd_enabled != NOT_SET)
		selected_lcd_type = lcd_enabled;
	if (lcd_type != NOT_SET)
		selected_lcd_type = lcd_type;

	lcd.enabled = (selected_lcd_type > 0);

	if (lcd.enabled) {
		/*
		 * Init lcd struct with load-time values to preserve exact
		 * current functionality (at least for now).
		 */
		lcd.charset = lcd_charset;
		lcd.proto = lcd_proto;
		lcd.pins.e = lcd_e_pin;
		lcd.pins.rs = lcd_rs_pin;
		lcd.pins.rw = lcd_rw_pin;
		lcd.pins.cl = lcd_cl_pin;
		lcd.pins.da = lcd_da_pin;
		lcd.pins.bl = lcd_bl_pin;
	}

	switch (selected_keypad_type) {
	case KEYPAD_TYPE_OLD:
		keypad_profile = old_keypad_profile;
		break;
	case KEYPAD_TYPE_NEW:
		keypad_profile = new_keypad_profile;
		break;
	case KEYPAD_TYPE_NEXCOM:
		keypad_profile = nexcom_keypad_profile;
		break;
	default:
		keypad_profile = NULL;
		break;
	}

	if (!lcd.enabled && !keypad.enabled) {
		/* no device enabled, let's exit */
		pr_err("panel driver disabled.\n");
		return -ENODEV;
	}

	err = parport_register_driver(&panel_driver);
	if (err) {
		pr_err("could not register with parport. Aborting.\n");
		return err;
	}

	if (pprt)
		pr_info("panel driver registered on parport%d (io=0x%lx).\n",
			parport, pprt->port->base);
	else
		pr_info("panel driver not yet registered\n");
	return 0;
}