Root/
1 | /* |
2 | * /dev/lcd driver for Apple Network Servers. |
3 | */ |
4 | |
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> |
13 | |
14 | #include <asm/uaccess.h> |
15 | #include <asm/sections.h> |
16 | #include <asm/prom.h> |
17 | #include <asm/io.h> |
18 | |
19 | #include "ans-lcd.h" |
20 | |
21 | #define ANSLCD_ADDR 0xf301c000 |
22 | #define ANSLCD_CTRL_IX 0x00 |
23 | #define ANSLCD_DATA_IX 0x10 |
24 | |
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); |
29 | |
30 | #undef DEBUG |
31 | |
32 | static void |
33 | anslcd_write_byte_ctrl ( unsigned char c ) |
34 | { |
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); |
45 | } |
46 | } |
47 | |
48 | static void |
49 | anslcd_write_byte_data ( unsigned char c ) |
50 | { |
51 | out_8(anslcd_ptr + ANSLCD_DATA_IX, c); |
52 | udelay(anslcd_short_delay); |
53 | } |
54 | |
55 | static ssize_t |
56 | anslcd_write( struct file * file, const char __user * buf, |
57 | size_t count, loff_t *ppos ) |
58 | { |
59 | const char __user *p = buf; |
60 | int i; |
61 | |
62 | #ifdef DEBUG |
63 | printk(KERN_DEBUG "LCD: write\n"); |
64 | #endif |
65 | |
66 | if (!access_ok(VERIFY_READ, buf, count)) |
67 | return -EFAULT; |
68 | |
69 | mutex_lock(&anslcd_mutex); |
70 | for ( i = *ppos; count > 0; ++i, ++p, --count ) |
71 | { |
72 | char c; |
73 | __get_user(c, p); |
74 | anslcd_write_byte_data( c ); |
75 | } |
76 | mutex_unlock(&anslcd_mutex); |
77 | *ppos = i; |
78 | return p - buf; |
79 | } |
80 | |
81 | static long |
82 | anslcd_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
83 | { |
84 | char ch, __user *temp; |
85 | long ret = 0; |
86 | |
87 | #ifdef DEBUG |
88 | printk(KERN_DEBUG "LCD: ioctl(%d,%d)\n",cmd,arg); |
89 | #endif |
90 | |
91 | mutex_lock(&anslcd_mutex); |
92 | |
93 | switch ( cmd ) |
94 | { |
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); |
108 | } |
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; |
124 | } |
125 | |
126 | mutex_unlock(&anslcd_mutex); |
127 | return ret; |
128 | } |
129 | |
130 | static int |
131 | anslcd_open( struct inode * inode, struct file * file ) |
132 | { |
133 | return 0; |
134 | } |
135 | |
136 | const struct file_operations anslcd_fops = { |
137 | .write = anslcd_write, |
138 | .unlocked_ioctl = anslcd_ioctl, |
139 | .open = anslcd_open, |
140 | .llseek = default_llseek, |
141 | }; |
142 | |
143 | static struct miscdevice anslcd_dev = { |
144 | ANSLCD_MINOR, |
145 | "anslcd", |
146 | &anslcd_fops |
147 | }; |
148 | |
149 | const char anslcd_logo[] = "********************" /* Line #1 */ |
150 | "* LINUX! *" /* Line #3 */ |
151 | "* Welcome to *" /* Line #2 */ |
152 | "********************"; /* Line #4 */ |
153 | |
154 | static int __init |
155 | anslcd_init(void) |
156 | { |
157 | int a; |
158 | int retval; |
159 | struct device_node* node; |
160 | |
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; |
165 | } |
166 | of_node_put(node); |
167 | |
168 | anslcd_ptr = ioremap(ANSLCD_ADDR, 0x20); |
169 | |
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; |
175 | } |
176 | |
177 | #ifdef DEBUG |
178 | printk(KERN_DEBUG "LCD: init\n"); |
179 | #endif |
180 | |
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]); |
189 | } |
190 | mutex_unlock(&anslcd_mutex); |
191 | return 0; |
192 | } |
193 | |
194 | static void __exit |
195 | anslcd_exit(void) |
196 | { |
197 | misc_deregister(&anslcd_dev); |
198 | iounmap(anslcd_ptr); |
199 | } |
200 | |
201 | module_init(anslcd_init); |
202 | module_exit(anslcd_exit); |
203 |
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