From: Michael Gernoth <michael@gernoth.net>
Date: Wed, 25 May 2011 10:32:12 +0000 (+0200)
Subject: unload support
X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/ms2-kexec/commitdiff_plain/81799b4e51fac01194bbea1cbbe2c176554e505e?ds=inline

unload support
---

diff --git a/headphone_cons.c b/headphone_cons.c
index edf8d16..1e35070 100644
--- a/headphone_cons.c
+++ b/headphone_cons.c
@@ -6,6 +6,8 @@
 #include <linux/gpio_mapping.h>
 #include <linux/gpio.h>
 
+static int hs_switch = -1;
+
 /*
  * int add_preferred_console(char *name, int idx, char *options)
  * c0069208 T add_preferred_console
@@ -15,25 +17,43 @@ static int (*add_preferred_console)(char *, int, char*) = (int (*)(char*, int, c
 
 static int __init headphone_cons_init(void)
 {
-	int hs_switch;
-
 	/* Get the headset switch gpio number from devtree */
 	hs_switch = get_gpio_by_name("headset_uart_switch");
 	if (hs_switch < 0)
 		return -EINVAL;
 
+	printk(KERN_INFO "headset_uart_switch: %d\n", hs_switch);
+
+	printk(KERN_INFO "value: %d\n", gpio_get_value(hs_switch));
+
+#if 0
 	/* configure headset switch gpio as output and
 	   direction based on devtree setting */
-	gpio_request(hs_switch, "mapphone audio headset uart switch");
+	if (gpio_request(hs_switch, "mapphone audio headset uart switch") < 0)
+		return -ENODEV;
+#endif
 
 	/* route kernel uart out headset jack */
 	gpio_direction_output(hs_switch, 0);
+	printk(KERN_INFO "value: %d\n", gpio_get_value(hs_switch));
 
-	add_preferred_console("ttyS", 1, "115200");
+	add_preferred_console("ttyS", 0, "115200");
 	return 0;
 }
 
+static void __exit headphone_cons_exit(void)
+{
+	if (hs_switch < 0)
+		return;
+
+	printk(KERN_INFO "value: %d\n", gpio_get_value(hs_switch));
+	gpio_direction_output(hs_switch, 1);
+	printk(KERN_INFO "value: %d\n", gpio_get_value(hs_switch));
+}
+
+
 module_init(headphone_cons_init);
+module_exit(headphone_cons_exit);
 
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Michael Gernoth <michael@gernoth.net>");