diff options
Diffstat (limited to 'drivers/auxdisplay/cfag12864b.c')
| -rw-r--r-- | drivers/auxdisplay/cfag12864b.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/auxdisplay/cfag12864b.c b/drivers/auxdisplay/cfag12864b.c index 889583dfc1a..cb44cb4f6a4 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: |