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path: root/drivers/auxdisplay/cfag12864b.c
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Diffstat (limited to 'drivers/auxdisplay/cfag12864b.c')
-rw-r--r--drivers/auxdisplay/cfag12864b.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/auxdisplay/cfag12864b.c b/drivers/auxdisplay/cfag12864b.c
index 889583d..cb44cb4 100644
--- a/drivers/auxdisplay/cfag12864b.c
+++ b/drivers/auxdisplay/cfag12864b.c
@@ -312,6 +312,17 @@ EXPORT_SYMBOL_GPL(cfag12864b_disable);
EXPORT_SYMBOL_GPL(cfag12864b_isenabled);
/*
+ * Is the module inited?
+ */
+
+static unsigned char cfag12864b_inited;
+unsigned char cfag12864b_isinited(void)
+{
+ return cfag12864b_inited;
+}
+EXPORT_SYMBOL_GPL(cfag12864b_isinited);
+
+/*
* Module Init & Exit
*/
@@ -319,6 +330,13 @@ static int __init cfag12864b_init(void)
{
int ret = -EINVAL;
+ /* ks0108_init() must be called first */
+ if (!ks0108_isinited()) {
+ printk(KERN_ERR CFAG12864B_NAME ": ERROR: "
+ "ks0108 is not initialized\n");
+ goto none;
+ }
+
if (PAGE_SIZE < CFAG12864B_SIZE) {
printk(KERN_ERR CFAG12864B_NAME ": ERROR: "
"page size (%i) < cfag12864b size (%i)\n",
@@ -354,6 +372,7 @@ static int __init cfag12864b_init(void)
cfag12864b_clear();
cfag12864b_on();
+ cfag12864b_inited = 1;
return 0;
cachealloced:
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