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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 | // SPDX-License-Identifier: GPL-2.0 /* * /dev/lcd driver for Apple Network Servers. */ #include <linux/types.h> #include <linux/errno.h> #include <linux/kernel.h> #include <linux/miscdevice.h> #include <linux/fcntl.h> #include <linux/module.h> #include <linux/delay.h> #include <linux/fs.h> #include <linux/uaccess.h> #include <asm/sections.h> #include <asm/prom.h> #include <asm/io.h> #include "ans-lcd.h" #define ANSLCD_ADDR 0xf301c000 #define ANSLCD_CTRL_IX 0x00 #define ANSLCD_DATA_IX 0x10 static unsigned long anslcd_short_delay = 80; static unsigned long anslcd_long_delay = 3280; static volatile unsigned char __iomem *anslcd_ptr; static DEFINE_MUTEX(anslcd_mutex); #undef DEBUG static void anslcd_write_byte_ctrl ( unsigned char c ) { #ifdef DEBUG printk(KERN_DEBUG "LCD: CTRL byte: %02x\n",c); #endif out_8(anslcd_ptr + ANSLCD_CTRL_IX, c); switch(c) { case 1: case 2: case 3: udelay(anslcd_long_delay); break; default: udelay(anslcd_short_delay); } } static void anslcd_write_byte_data ( unsigned char c ) { out_8(anslcd_ptr + ANSLCD_DATA_IX, c); udelay(anslcd_short_delay); } static ssize_t anslcd_write( struct file * file, const char __user * buf, size_t count, loff_t *ppos ) { const char __user *p = buf; int i; #ifdef DEBUG printk(KERN_DEBUG "LCD: write\n"); #endif if (!access_ok(VERIFY_READ, buf, count)) return -EFAULT; mutex_lock(&anslcd_mutex); for ( i = *ppos; count > 0; ++i, ++p, --count ) { char c; __get_user(c, p); anslcd_write_byte_data( c ); } mutex_unlock(&anslcd_mutex); *ppos = i; return p - buf; } static long anslcd_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { char ch, __user *temp; long ret = 0; #ifdef DEBUG printk(KERN_DEBUG "LCD: ioctl(%d,%d)\n",cmd,arg); #endif mutex_lock(&anslcd_mutex); switch ( cmd ) { case ANSLCD_CLEAR: anslcd_write_byte_ctrl ( 0x38 ); anslcd_write_byte_ctrl ( 0x0f ); anslcd_write_byte_ctrl ( 0x06 ); anslcd_write_byte_ctrl ( 0x01 ); anslcd_write_byte_ctrl ( 0x02 ); break; case ANSLCD_SENDCTRL: temp = (char __user *) arg; __get_user(ch, temp); for (; ch; temp++) { /* FIXME: This is ugly, but should work, as a \0 byte is not a valid command code */ anslcd_write_byte_ctrl ( ch ); __get_user(ch, temp); } break; case ANSLCD_SETSHORTDELAY: if (!capable(CAP_SYS_ADMIN)) ret =-EACCES; else anslcd_short_delay=arg; break; case ANSLCD_SETLONGDELAY: if (!capable(CAP_SYS_ADMIN)) ret = -EACCES; else anslcd_long_delay=arg; break; default: ret = -EINVAL; } mutex_unlock(&anslcd_mutex); return ret; } static int anslcd_open( struct inode * inode, struct file * file ) { return 0; } const struct file_operations anslcd_fops = { .write = anslcd_write, .unlocked_ioctl = anslcd_ioctl, .open = anslcd_open, .llseek = default_llseek, }; static struct miscdevice anslcd_dev = { ANSLCD_MINOR, "anslcd", &anslcd_fops }; const char anslcd_logo[] = "********************" /* Line #1 */ "* LINUX! *" /* Line #3 */ "* Welcome to *" /* Line #2 */ "********************"; /* Line #4 */ static int __init anslcd_init(void) { int a; int retval; struct device_node* node; node = of_find_node_by_name(NULL, "lcd"); if (!node || !node->parent || strcmp(node->parent->name, "gc")) { of_node_put(node); return -ENODEV; } of_node_put(node); anslcd_ptr = ioremap(ANSLCD_ADDR, 0x20); retval = misc_register(&anslcd_dev); if(retval < 0){ printk(KERN_INFO "LCD: misc_register failed\n"); iounmap(anslcd_ptr); return retval; } #ifdef DEBUG printk(KERN_DEBUG "LCD: init\n"); #endif mutex_lock(&anslcd_mutex); anslcd_write_byte_ctrl ( 0x38 ); anslcd_write_byte_ctrl ( 0x0c ); anslcd_write_byte_ctrl ( 0x06 ); anslcd_write_byte_ctrl ( 0x01 ); anslcd_write_byte_ctrl ( 0x02 ); for(a=0;a<80;a++) { anslcd_write_byte_data(anslcd_logo[a]); } mutex_unlock(&anslcd_mutex); return 0; } static void __exit anslcd_exit(void) { misc_deregister(&anslcd_dev); iounmap(anslcd_ptr); } module_init(anslcd_init); module_exit(anslcd_exit); |