include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit...
[linux-3.10.git] / drivers / char / briq_panel.c
1 /*
2  * Drivers for the Total Impact PPC based computer "BRIQ"
3  * by Dr. Karsten Jeppesen
4  *
5  */
6
7 #include <linux/module.h>
8
9 #include <linux/smp_lock.h>
10 #include <linux/types.h>
11 #include <linux/errno.h>
12 #include <linux/tty.h>
13 #include <linux/timer.h>
14 #include <linux/kernel.h>
15 #include <linux/wait.h>
16 #include <linux/string.h>
17 #include <linux/ioport.h>
18 #include <linux/delay.h>
19 #include <linux/miscdevice.h>
20 #include <linux/fs.h>
21 #include <linux/mm.h>
22 #include <linux/init.h>
23
24 #include <asm/uaccess.h>
25 #include <asm/io.h>
26 #include <asm/prom.h>
27
28 #define         BRIQ_PANEL_MINOR        156
29 #define         BRIQ_PANEL_VFD_IOPORT   0x0390
30 #define         BRIQ_PANEL_LED_IOPORT   0x0398
31 #define         BRIQ_PANEL_VER          "1.1 (04/20/2002)"
32 #define         BRIQ_PANEL_MSG0         "Loading Linux"
33
34 static int              vfd_is_open;
35 static unsigned char    vfd[40];
36 static int              vfd_cursor;
37 static unsigned char    ledpb, led;
38
39 static void update_vfd(void)
40 {
41         int     i;
42
43         /* cursor home */
44         outb(0x02, BRIQ_PANEL_VFD_IOPORT);
45         for (i=0; i<20; i++)
46                 outb(vfd[i], BRIQ_PANEL_VFD_IOPORT + 1);
47
48         /* cursor to next line */
49         outb(0xc0, BRIQ_PANEL_VFD_IOPORT);
50         for (i=20; i<40; i++)
51                 outb(vfd[i], BRIQ_PANEL_VFD_IOPORT + 1);
52
53 }
54
55 static void set_led(char state)
56 {
57         if (state == 'R')
58                 led = 0x01;
59         else if (state == 'G')
60                 led = 0x02;
61         else if (state == 'Y')
62                 led = 0x03;
63         else if (state == 'X')
64                 led = 0x00;
65         outb(led, BRIQ_PANEL_LED_IOPORT);
66 }
67
68 static int briq_panel_open(struct inode *ino, struct file *filep)
69 {
70         lock_kernel();
71         /* enforce single access, vfd_is_open is protected by BKL */
72         if (vfd_is_open) {
73                 unlock_kernel();
74                 return -EBUSY;
75         }
76         vfd_is_open = 1;
77
78         unlock_kernel();
79         return 0;
80 }
81
82 static int briq_panel_release(struct inode *ino, struct file *filep)
83 {
84         if (!vfd_is_open)
85                 return -ENODEV;
86
87         vfd_is_open = 0;
88
89         return 0;
90 }
91
92 static ssize_t briq_panel_read(struct file *file, char __user *buf, size_t count,
93                          loff_t *ppos)
94 {
95         unsigned short c;
96         unsigned char cp;
97
98         if (!vfd_is_open)
99                 return -ENODEV;
100
101         c = (inb(BRIQ_PANEL_LED_IOPORT) & 0x000c) | (ledpb & 0x0003);
102         set_led(' ');
103         /* upper button released */
104         if ((!(ledpb & 0x0004)) && (c & 0x0004)) {
105                 cp = ' ';
106                 ledpb = c;
107                 if (copy_to_user(buf, &cp, 1))
108                         return -EFAULT;
109                 return 1;
110         }
111         /* lower button released */
112         else if ((!(ledpb & 0x0008)) && (c & 0x0008)) {
113                 cp = '\r';
114                 ledpb = c;
115                 if (copy_to_user(buf, &cp, 1))
116                         return -EFAULT;
117                 return 1;
118         } else {
119                 ledpb = c;
120                 return 0;
121         }
122 }
123
124 static void scroll_vfd( void )
125 {
126         int     i;
127
128         for (i=0; i<20; i++) {
129                 vfd[i] = vfd[i+20];
130                 vfd[i+20] = ' ';
131         }
132         vfd_cursor = 20;
133 }
134
135 static ssize_t briq_panel_write(struct file *file, const char __user *buf, size_t len,
136                           loff_t *ppos)
137 {
138         size_t indx = len;
139         int i, esc = 0;
140
141         if (!vfd_is_open)
142                 return -EBUSY;
143
144         for (;;) {
145                 char c;
146                 if (!indx)
147                         break;
148                 if (get_user(c, buf))
149                         return -EFAULT;
150                 if (esc) {
151                         set_led(c);
152                         esc = 0;
153                 } else if (c == 27) {
154                         esc = 1;
155                 } else if (c == 12) {
156                         /* do a form feed */
157                         for (i=0; i<40; i++)
158                                 vfd[i] = ' ';
159                         vfd_cursor = 0;
160                 } else if (c == 10) {
161                         if (vfd_cursor < 20)
162                                 vfd_cursor = 20;
163                         else if (vfd_cursor < 40)
164                                 vfd_cursor = 40;
165                         else if (vfd_cursor < 60)
166                                 vfd_cursor = 60;
167                         if (vfd_cursor > 59)
168                                 scroll_vfd();
169                 } else {
170                         /* just a character */
171                         if (vfd_cursor > 39)
172                                 scroll_vfd();
173                         vfd[vfd_cursor++] = c;
174                 }
175                 indx--;
176                 buf++;
177         }
178         update_vfd();
179
180         return len;
181 }
182
183 static const struct file_operations briq_panel_fops = {
184         .owner          = THIS_MODULE,
185         .read           = briq_panel_read,
186         .write          = briq_panel_write,
187         .open           = briq_panel_open,
188         .release        = briq_panel_release,
189 };
190
191 static struct miscdevice briq_panel_miscdev = {
192         BRIQ_PANEL_MINOR,
193         "briq_panel",
194         &briq_panel_fops
195 };
196
197 static int __init briq_panel_init(void)
198 {
199         struct device_node *root = of_find_node_by_path("/");
200         const char *machine;
201         int i;
202
203         machine = of_get_property(root, "model", NULL);
204         if (!machine || strncmp(machine, "TotalImpact,BRIQ-1", 18) != 0) {
205                 of_node_put(root);
206                 return -ENODEV;
207         }
208         of_node_put(root);
209
210         printk(KERN_INFO
211                 "briq_panel: v%s Dr. Karsten Jeppesen (kj@totalimpact.com)\n",
212                 BRIQ_PANEL_VER);
213
214         if (!request_region(BRIQ_PANEL_VFD_IOPORT, 4, "BRIQ Front Panel"))
215                 return -EBUSY;
216
217         if (!request_region(BRIQ_PANEL_LED_IOPORT, 2, "BRIQ Front Panel")) {
218                 release_region(BRIQ_PANEL_VFD_IOPORT, 4);
219                 return -EBUSY;
220         }
221         ledpb = inb(BRIQ_PANEL_LED_IOPORT) & 0x000c;
222
223         if (misc_register(&briq_panel_miscdev) < 0) {
224                 release_region(BRIQ_PANEL_VFD_IOPORT, 4);
225                 release_region(BRIQ_PANEL_LED_IOPORT, 2);
226                 return -EBUSY;
227         }
228
229         outb(0x38, BRIQ_PANEL_VFD_IOPORT);      /* Function set */
230         outb(0x01, BRIQ_PANEL_VFD_IOPORT);      /* Clear display */
231         outb(0x0c, BRIQ_PANEL_VFD_IOPORT);      /* Display on */
232         outb(0x06, BRIQ_PANEL_VFD_IOPORT);      /* Entry normal */
233         for (i=0; i<40; i++)
234                 vfd[i]=' ';
235 #ifndef MODULE
236         vfd[0] = 'L';
237         vfd[1] = 'o';
238         vfd[2] = 'a';
239         vfd[3] = 'd';
240         vfd[4] = 'i';
241         vfd[5] = 'n';
242         vfd[6] = 'g';
243         vfd[7] = ' ';
244         vfd[8] = '.';
245         vfd[9] = '.';
246         vfd[10] = '.';
247 #endif /* !MODULE */
248
249         update_vfd();
250
251         return 0;
252 }
253
254 static void __exit briq_panel_exit(void)
255 {
256         misc_deregister(&briq_panel_miscdev);
257         release_region(BRIQ_PANEL_VFD_IOPORT, 4);
258         release_region(BRIQ_PANEL_LED_IOPORT, 2);
259 }
260
261 module_init(briq_panel_init);
262 module_exit(briq_panel_exit);
263
264 MODULE_LICENSE("GPL");
265 MODULE_AUTHOR("Karsten Jeppesen <karsten@jeppesens.com>");
266 MODULE_DESCRIPTION("Driver for the Total Impact briQ front panel");