2 * /dev/lcd driver for Apple Network Servers.
5 #include <linux/types.h>
6 #include <linux/errno.h>
7 #include <linux/kernel.h>
8 #include <linux/miscdevice.h>
9 #include <linux/fcntl.h>
10 #include <linux/init.h>
11 #include <linux/delay.h>
14 #include <asm/uaccess.h>
15 #include <asm/sections.h>
17 #include <asm/ans-lcd.h>
20 #define ANSLCD_ADDR 0xf301c000
21 #define ANSLCD_CTRL_IX 0x00
22 #define ANSLCD_DATA_IX 0x10
24 static unsigned long anslcd_short_delay = 80;
25 static unsigned long anslcd_long_delay = 3280;
26 static volatile unsigned char __iomem *anslcd_ptr;
31 anslcd_write_byte_ctrl ( unsigned char c )
34 printk(KERN_DEBUG "LCD: CTRL byte: %02x\n",c);
36 out_8(anslcd_ptr + ANSLCD_CTRL_IX, c);
41 udelay(anslcd_long_delay); break;
42 default: udelay(anslcd_short_delay);
47 anslcd_write_byte_data ( unsigned char c )
49 out_8(anslcd_ptr + ANSLCD_DATA_IX, c);
50 udelay(anslcd_short_delay);
54 anslcd_write( struct file * file, const char __user * buf,
55 size_t count, loff_t *ppos )
57 const char __user *p = buf;
61 printk(KERN_DEBUG "LCD: write\n");
64 if (!access_ok(VERIFY_READ, buf, count))
66 for ( i = *ppos; count > 0; ++i, ++p, --count )
70 anslcd_write_byte_data( c );
77 anslcd_ioctl( struct inode * inode, struct file * file,
78 unsigned int cmd, unsigned long arg )
80 char ch, __user *temp;
83 printk(KERN_DEBUG "LCD: ioctl(%d,%d)\n",cmd,arg);
89 anslcd_write_byte_ctrl ( 0x38 );
90 anslcd_write_byte_ctrl ( 0x0f );
91 anslcd_write_byte_ctrl ( 0x06 );
92 anslcd_write_byte_ctrl ( 0x01 );
93 anslcd_write_byte_ctrl ( 0x02 );
96 temp = (char __user *) arg;
98 for (; ch; temp++) { /* FIXME: This is ugly, but should work, as a \0 byte is not a valid command code */
99 anslcd_write_byte_ctrl ( ch );
100 __get_user(ch, temp);
103 case ANSLCD_SETSHORTDELAY:
104 if (!capable(CAP_SYS_ADMIN))
106 anslcd_short_delay=arg;
108 case ANSLCD_SETLONGDELAY:
109 if (!capable(CAP_SYS_ADMIN))
111 anslcd_long_delay=arg;
119 anslcd_open( struct inode * inode, struct file * file )
124 const struct file_operations anslcd_fops = {
125 .write = anslcd_write,
126 .ioctl = anslcd_ioctl,
130 static struct miscdevice anslcd_dev = {
136 const char anslcd_logo[] = "********************" /* Line #1 */
137 "* LINUX! *" /* Line #3 */
138 "* Welcome to *" /* Line #2 */
139 "********************"; /* Line #4 */
146 struct device_node* node;
148 node = of_find_node_by_name(NULL, "lcd");
149 if (!node || !node->parent || strcmp(node->parent->name, "gc")) {
155 anslcd_ptr = ioremap(ANSLCD_ADDR, 0x20);
157 retval = misc_register(&anslcd_dev);
159 printk(KERN_INFO "LCD: misc_register failed\n");
165 printk(KERN_DEBUG "LCD: init\n");
168 anslcd_write_byte_ctrl ( 0x38 );
169 anslcd_write_byte_ctrl ( 0x0c );
170 anslcd_write_byte_ctrl ( 0x06 );
171 anslcd_write_byte_ctrl ( 0x01 );
172 anslcd_write_byte_ctrl ( 0x02 );
174 anslcd_write_byte_data(anslcd_logo[a]);
182 misc_deregister(&anslcd_dev);
186 module_init(anslcd_init);
187 module_exit(anslcd_exit);