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",
(unsigned int)PAGE_SIZE, CFAG12864B_SIZE);
ret = -ENOMEM;
goto none;
}
cfag12864b_buffer = (unsigned char *) __get_free_page(GFP_KERNEL);
if (cfag12864b_buffer == NULL) {
printk(KERN_ERR CFAG12864B_NAME ": ERROR: "
"can't get a free page\n");
ret = -ENOMEM;
goto none;
}
cfag12864b_cache = kmalloc(sizeof(unsigned char) *
CFAG12864B_SIZE, GFP_KERNEL);
if (cfag12864b_buffer == NULL) {
printk(KERN_ERR CFAG12864B_NAME ": ERROR: "
"can't alloc cache buffer (%i bytes)\n",
CFAG12864B_SIZE);
ret = -ENOMEM;
goto bufferalloced;
}
cfag12864b_workqueue = create_singlethread_workqueue(CFAG12864B_NAME);
if (cfag12864b_workqueue == NULL)
goto cachealloced;
memset(cfag12864b_buffer, 0, CFAG12864B_SIZE);
cfag12864b_clear();
cfag12864b_on();
cfag12864b_inited = 1;
return 0;
cachealloced:
kfree(cfag12864b_cache);
bufferalloced:
free_page((unsigned long) cfag12864b_buffer);
none:
return ret;
}
static int __init cfag12864b_init(void)
{
int ret = -EINVAL;
if (!ks0108_isinited()) {
printk(KERN_ERR CFAG12864B_NAME ": ERROR: "
"ks0108 is not initialized\n");
goto none;
}
BUILD_BUG_ON(PAGE_SIZE < CFAG12864B_SIZE);
cfag12864b_buffer = (unsigned char *) get_zeroed_page(GFP_KERNEL);
if (cfag12864b_buffer == NULL) {
printk(KERN_ERR CFAG12864B_NAME ": ERROR: "
"can't get a free page\n");
ret = -ENOMEM;
goto none;
}
cfag12864b_cache = kmalloc(sizeof(unsigned char) *
CFAG12864B_SIZE, GFP_KERNEL);
if (cfag12864b_cache == NULL) {
printk(KERN_ERR CFAG12864B_NAME ": ERROR: "
"can't alloc cache buffer (%i bytes)\n",
CFAG12864B_SIZE);
ret = -ENOMEM;
goto bufferalloced;
}
cfag12864b_workqueue = create_singlethread_workqueue(CFAG12864B_NAME);
if (cfag12864b_workqueue == NULL)
goto cachealloced;
cfag12864b_clear();
cfag12864b_on();
cfag12864b_inited = 1;
return 0;
cachealloced:
kfree(cfag12864b_cache);
bufferalloced:
free_page((unsigned long) cfag12864b_buffer);
none:
return ret;
}