diff options
| -rw-r--r-- | drivers/auxdisplay/cfag12864b.c | 19 | ||||
| -rw-r--r-- | drivers/auxdisplay/cfag12864bfb.c | 10 | ||||
| -rw-r--r-- | drivers/auxdisplay/ks0108.c | 12 | ||||
| -rw-r--r-- | include/linux/cfag12864b.h | 5 | ||||
| -rw-r--r-- | include/linux/ks0108.h | 3 |
5 files changed, 48 insertions, 1 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: diff --git a/drivers/auxdisplay/cfag12864bfb.c b/drivers/auxdisplay/cfag12864bfb.c index 94765e78315..66fafbb1d08 100644 --- a/drivers/auxdisplay/cfag12864bfb.c +++ b/drivers/auxdisplay/cfag12864bfb.c @@ -137,7 +137,14 @@ static struct platform_device *cfag12864bfb_device; static int __init cfag12864bfb_init(void) { - int ret; + int ret = -EINVAL; + + /* cfag12864b_init() must be called first */ + if (!cfag12864b_isinited()) { + printk(KERN_ERR CFAG12864BFB_NAME ": ERROR: " + "cfag12864b is not initialized\n"); + goto none; + } if (cfag12864b_enable()) { printk(KERN_ERR CFAG12864BFB_NAME ": ERROR: " @@ -162,6 +169,7 @@ static int __init cfag12864bfb_init(void) } } +none: return ret; } diff --git a/drivers/auxdisplay/ks0108.c b/drivers/auxdisplay/ks0108.c index a637575b910..e6c3646ef18 100644 --- a/drivers/auxdisplay/ks0108.c +++ b/drivers/auxdisplay/ks0108.c @@ -111,6 +111,17 @@ EXPORT_SYMBOL_GPL(ks0108_address); EXPORT_SYMBOL_GPL(ks0108_page); /* + * Is the module inited? + */ + +static unsigned char ks0108_inited; +unsigned char ks0108_isinited(void) +{ + return ks0108_inited; +} +EXPORT_SYMBOL_GPL(ks0108_isinited); + +/* * Module Init & Exit */ @@ -142,6 +153,7 @@ static int __init ks0108_init(void) goto registered; } + ks0108_inited = 1; return 0; registered: diff --git a/include/linux/cfag12864b.h b/include/linux/cfag12864b.h index 0bc45e69da5..1605dd8aa64 100644 --- a/include/linux/cfag12864b.h +++ b/include/linux/cfag12864b.h @@ -73,5 +73,10 @@ extern void cfag12864b_disable(void); */ extern unsigned char cfag12864b_isenabled(void); +/* + * Is the module inited? + */ +extern unsigned char cfag12864b_isinited(void); + #endif /* _CFAG12864B_H_ */ diff --git a/include/linux/ks0108.h b/include/linux/ks0108.h index 8047d4b17bf..a2c54acceb4 100644 --- a/include/linux/ks0108.h +++ b/include/linux/ks0108.h @@ -43,4 +43,7 @@ extern void ks0108_address(unsigned char address); /* Set the controller's current page (0..7) */ extern void ks0108_page(unsigned char page); +/* Is the module inited? */ +extern unsigned char ks0108_isinited(void); + #endif /* _KS0108_H_ */ |