Merge tag 'for-3.9-rc3' of git://openrisc.net/jonas/linux
[linux-2.6/cjktty.git] / drivers / macintosh / ans-lcd.c
blob1a57e88a38f7554ef3c09199090ce52575d041ef
1 /*
2 * /dev/lcd driver for Apple Network Servers.
3 */
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>
12 #include <linux/fs.h>
14 #include <asm/uaccess.h>
15 #include <asm/sections.h>
16 #include <asm/prom.h>
17 #include <asm/io.h>
19 #include "ans-lcd.h"
21 #define ANSLCD_ADDR 0xf301c000
22 #define ANSLCD_CTRL_IX 0x00
23 #define ANSLCD_DATA_IX 0x10
25 static unsigned long anslcd_short_delay = 80;
26 static unsigned long anslcd_long_delay = 3280;
27 static volatile unsigned char __iomem *anslcd_ptr;
28 static DEFINE_MUTEX(anslcd_mutex);
30 #undef DEBUG
32 static void
33 anslcd_write_byte_ctrl ( unsigned char c )
35 #ifdef DEBUG
36 printk(KERN_DEBUG "LCD: CTRL byte: %02x\n",c);
37 #endif
38 out_8(anslcd_ptr + ANSLCD_CTRL_IX, c);
39 switch(c) {
40 case 1:
41 case 2:
42 case 3:
43 udelay(anslcd_long_delay); break;
44 default: udelay(anslcd_short_delay);
48 static void
49 anslcd_write_byte_data ( unsigned char c )
51 out_8(anslcd_ptr + ANSLCD_DATA_IX, c);
52 udelay(anslcd_short_delay);
55 static ssize_t
56 anslcd_write( struct file * file, const char __user * buf,
57 size_t count, loff_t *ppos )
59 const char __user *p = buf;
60 int i;
62 #ifdef DEBUG
63 printk(KERN_DEBUG "LCD: write\n");
64 #endif
66 if (!access_ok(VERIFY_READ, buf, count))
67 return -EFAULT;
69 mutex_lock(&anslcd_mutex);
70 for ( i = *ppos; count > 0; ++i, ++p, --count )
72 char c;
73 __get_user(c, p);
74 anslcd_write_byte_data( c );
76 mutex_unlock(&anslcd_mutex);
77 *ppos = i;
78 return p - buf;
81 static long
82 anslcd_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
84 char ch, __user *temp;
85 long ret = 0;
87 #ifdef DEBUG
88 printk(KERN_DEBUG "LCD: ioctl(%d,%d)\n",cmd,arg);
89 #endif
91 mutex_lock(&anslcd_mutex);
93 switch ( cmd )
95 case ANSLCD_CLEAR:
96 anslcd_write_byte_ctrl ( 0x38 );
97 anslcd_write_byte_ctrl ( 0x0f );
98 anslcd_write_byte_ctrl ( 0x06 );
99 anslcd_write_byte_ctrl ( 0x01 );
100 anslcd_write_byte_ctrl ( 0x02 );
101 break;
102 case ANSLCD_SENDCTRL:
103 temp = (char __user *) arg;
104 __get_user(ch, temp);
105 for (; ch; temp++) { /* FIXME: This is ugly, but should work, as a \0 byte is not a valid command code */
106 anslcd_write_byte_ctrl ( ch );
107 __get_user(ch, temp);
109 break;
110 case ANSLCD_SETSHORTDELAY:
111 if (!capable(CAP_SYS_ADMIN))
112 ret =-EACCES;
113 else
114 anslcd_short_delay=arg;
115 break;
116 case ANSLCD_SETLONGDELAY:
117 if (!capable(CAP_SYS_ADMIN))
118 ret = -EACCES;
119 else
120 anslcd_long_delay=arg;
121 break;
122 default:
123 ret = -EINVAL;
126 mutex_unlock(&anslcd_mutex);
127 return ret;
130 static int
131 anslcd_open( struct inode * inode, struct file * file )
133 return 0;
136 const struct file_operations anslcd_fops = {
137 .write = anslcd_write,
138 .unlocked_ioctl = anslcd_ioctl,
139 .open = anslcd_open,
140 .llseek = default_llseek,
143 static struct miscdevice anslcd_dev = {
144 ANSLCD_MINOR,
145 "anslcd",
146 &anslcd_fops
149 const char anslcd_logo[] = "********************" /* Line #1 */
150 "* LINUX! *" /* Line #3 */
151 "* Welcome to *" /* Line #2 */
152 "********************"; /* Line #4 */
154 static int __init
155 anslcd_init(void)
157 int a;
158 int retval;
159 struct device_node* node;
161 node = of_find_node_by_name(NULL, "lcd");
162 if (!node || !node->parent || strcmp(node->parent->name, "gc")) {
163 of_node_put(node);
164 return -ENODEV;
166 of_node_put(node);
168 anslcd_ptr = ioremap(ANSLCD_ADDR, 0x20);
170 retval = misc_register(&anslcd_dev);
171 if(retval < 0){
172 printk(KERN_INFO "LCD: misc_register failed\n");
173 iounmap(anslcd_ptr);
174 return retval;
177 #ifdef DEBUG
178 printk(KERN_DEBUG "LCD: init\n");
179 #endif
181 mutex_lock(&anslcd_mutex);
182 anslcd_write_byte_ctrl ( 0x38 );
183 anslcd_write_byte_ctrl ( 0x0c );
184 anslcd_write_byte_ctrl ( 0x06 );
185 anslcd_write_byte_ctrl ( 0x01 );
186 anslcd_write_byte_ctrl ( 0x02 );
187 for(a=0;a<80;a++) {
188 anslcd_write_byte_data(anslcd_logo[a]);
190 mutex_unlock(&anslcd_mutex);
191 return 0;
194 static void __exit
195 anslcd_exit(void)
197 misc_deregister(&anslcd_dev);
198 iounmap(anslcd_ptr);
201 module_init(anslcd_init);
202 module_exit(anslcd_exit);