X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=kernel%2Fprintk.c;h=8fb01c32aa3bb7eaf44f5b9e63e316628dd935c1;hb=3b7253238801a7b97b3929d8db2fa7a0721fb17b;hp=c46a20a19a153f06e938d469bf760ee893b63114;hpb=3bb5da3837cc1aa17736b05139c9a22c3794851a;p=pandora-kernel.git

diff --git a/kernel/printk.c b/kernel/printk.c
index c46a20a19a15..8fb01c32aa3b 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -111,6 +111,9 @@ struct console_cmdline
 	char	name[8];			/* Name of the driver	    */
 	int	index;				/* Minor dev. to use	    */
 	char	*options;			/* Options for the driver   */
+#ifdef CONFIG_A11Y_BRAILLE_CONSOLE
+	char	*brl_options;			/* Options for braille driver */
+#endif
 };
 
 #define MAX_CMDLINECONSOLES 8
@@ -643,8 +646,21 @@ static int acquire_console_semaphore_for_printk(unsigned int cpu)
 {
 	int retval = 0;
 
-	if (can_use_console(cpu))
-		retval = !try_acquire_console_sem();
+	if (!try_acquire_console_sem()) {
+		retval = 1;
+
+		/*
+		 * If we can't use the console, we need to release
+		 * the console semaphore by hand to avoid flushing
+		 * the buffer. We need to hold the console semaphore
+		 * in order to do this test safely.
+		 */
+		if (!can_use_console(cpu)) {
+			console_locked = 0;
+			up(&console_sem);
+			retval = 0;
+		}
+	}
 	printk_cpu = UINT_MAX;
 	spin_unlock(&logbuf_lock);
 	return retval;
@@ -795,15 +811,60 @@ static void call_console_drivers(unsigned start, unsigned end)
 
 #endif
 
+static int __add_preferred_console(char *name, int idx, char *options,
+				   char *brl_options)
+{
+	struct console_cmdline *c;
+	int i;
+
+	/*
+	 *	See if this tty is not yet registered, and
+	 *	if we have a slot free.
+	 */
+	for (i = 0; i < MAX_CMDLINECONSOLES && console_cmdline[i].name[0]; i++)
+		if (strcmp(console_cmdline[i].name, name) == 0 &&
+			  console_cmdline[i].index == idx) {
+				if (!brl_options)
+					selected_console = i;
+				return 0;
+		}
+	if (i == MAX_CMDLINECONSOLES)
+		return -E2BIG;
+	if (!brl_options)
+		selected_console = i;
+	c = &console_cmdline[i];
+	strlcpy(c->name, name, sizeof(c->name));
+	c->options = options;
+#ifdef CONFIG_A11Y_BRAILLE_CONSOLE
+	c->brl_options = brl_options;
+#endif
+	c->index = idx;
+	return 0;
+}
 /*
  * Set up a list of consoles.  Called from init/main.c
  */
 static int __init console_setup(char *str)
 {
 	char buf[sizeof(console_cmdline[0].name) + 4]; /* 4 for index */
-	char *s, *options;
+	char *s, *options, *brl_options = NULL;
 	int idx;
 
+#ifdef CONFIG_A11Y_BRAILLE_CONSOLE
+	if (!memcmp(str, "brl,", 4)) {
+		brl_options = "";
+		str += 4;
+	} else if (!memcmp(str, "brl=", 4)) {
+		brl_options = str + 4;
+		str = strchr(brl_options, ',');
+		if (!str) {
+			printk(KERN_ERR "need port name after brl=\n");
+			return 1;
+		}
+		*(str++) = 0;
+	}
+#endif
+
 	/*
 	 * Decode str into name, index, options.
 	 */
@@ -828,7 +889,7 @@ static int __init console_setup(char *str)
 	idx = simple_strtoul(s, NULL, 10);
 	*s = 0;
 
-	add_preferred_console(buf, idx, options);
+	__add_preferred_console(buf, idx, options, brl_options);
 	return 1;
 }
 __setup("console=", console_setup);
@@ -848,28 +909,7 @@ __setup("console=", console_setup);
  */
 int add_preferred_console(char *name, int idx, char *options)
 {
-	struct console_cmdline *c;
-	int i;
-
-	/*
-	 *	See if this tty is not yet registered, and
-	 *	if we have a slot free.
-	 */
-	for (i = 0; i < MAX_CMDLINECONSOLES && console_cmdline[i].name[0]; i++)
-		if (strcmp(console_cmdline[i].name, name) == 0 &&
-			  console_cmdline[i].index == idx) {
-				selected_console = i;
-				return 0;
-		}
-	if (i == MAX_CMDLINECONSOLES)
-		return -E2BIG;
-	selected_console = i;
-	c = &console_cmdline[i];
-	memcpy(c->name, name, sizeof(c->name));
-	c->name[sizeof(c->name) - 1] = 0;
-	c->options = options;
-	c->index = idx;
-	return 0;
+	return __add_preferred_console(name, idx, options, NULL);
 }
 
 int update_console_cmdline(char *name, int idx, char *name_new, int idx_new, char *options)
@@ -881,7 +921,7 @@ int update_console_cmdline(char *name, int idx, char *name_new, int idx_new, cha
 		if (strcmp(console_cmdline[i].name, name) == 0 &&
 			  console_cmdline[i].index == idx) {
 				c = &console_cmdline[i];
-				memcpy(c->name, name_new, sizeof(c->name));
+				strlcpy(c->name, name_new, sizeof(c->name));
 				c->name[sizeof(c->name) - 1] = 0;
 				c->options = options;
 				c->index = idx_new;
@@ -1150,6 +1190,16 @@ void register_console(struct console *console)
 			continue;
 		if (console->index < 0)
 			console->index = console_cmdline[i].index;
+#ifdef CONFIG_A11Y_BRAILLE_CONSOLE
+		if (console_cmdline[i].brl_options) {
+			console->flags |= CON_BRL;
+			braille_register_console(console,
+					console_cmdline[i].index,
+					console_cmdline[i].options,
+					console_cmdline[i].brl_options);
+			return;
+		}
+#endif
 		if (console->setup &&
 		    console->setup(console, console_cmdline[i].options) != 0)
 			break;
@@ -1208,6 +1258,11 @@ int unregister_console(struct console *console)
         struct console *a, *b;
 	int res = 1;
 
+#ifdef CONFIG_A11Y_BRAILLE_CONSOLE
+	if (console->flags & CON_BRL)
+		return braille_unregister_console(console);
+#endif
+
 	acquire_console_sem();
 	if (console_drivers == console) {
 		console_drivers=console->next;
@@ -1259,8 +1314,8 @@ late_initcall(disable_boot_consoles);
  */
 void tty_write_message(struct tty_struct *tty, char *msg)
 {
-	if (tty && tty->driver->write)
-		tty->driver->write(tty, msg, strlen(msg));
+	if (tty && tty->ops->write)
+		tty->ops->write(tty, msg, strlen(msg));
 	return;
 }
 
@@ -1274,31 +1329,7 @@ void tty_write_message(struct tty_struct *tty, char *msg)
  */
 int __printk_ratelimit(int ratelimit_jiffies, int ratelimit_burst)
 {
-	static DEFINE_SPINLOCK(ratelimit_lock);
-	static unsigned toks = 10 * 5 * HZ;
-	static unsigned long last_msg;
-	static int missed;
-	unsigned long flags;
-	unsigned long now = jiffies;
-
-	spin_lock_irqsave(&ratelimit_lock, flags);
-	toks += now - last_msg;
-	last_msg = now;
-	if (toks > (ratelimit_burst * ratelimit_jiffies))
-		toks = ratelimit_burst * ratelimit_jiffies;
-	if (toks >= ratelimit_jiffies) {
-		int lost = missed;
-
-		missed = 0;
-		toks -= ratelimit_jiffies;
-		spin_unlock_irqrestore(&ratelimit_lock, flags);
-		if (lost)
-			printk(KERN_WARNING "printk: %d messages suppressed.\n", lost);
-		return 1;
-	}
-	missed++;
-	spin_unlock_irqrestore(&ratelimit_lock, flags);
-	return 0;
+	return __ratelimit(ratelimit_jiffies, ratelimit_burst);
 }
 EXPORT_SYMBOL(__printk_ratelimit);