ACPI: EC: Drop ECDT-based boot_ec as soon as we find DSDT-based one.
[linux-2.6] / 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/types.h>
10 #include <linux/errno.h>
11 #include <linux/tty.h>
12 #include <linux/timer.h>
13 #include <linux/kernel.h>
14 #include <linux/wait.h>
15 #include <linux/string.h>
16 #include <linux/slab.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         /* enforce single access */
71         if (vfd_is_open)
72                 return -EBUSY;
73         vfd_is_open = 1;
74
75         return 0;
76 }
77
78 static int briq_panel_release(struct inode *ino, struct file *filep)
79 {
80         if (!vfd_is_open)
81                 return -ENODEV;
82
83         vfd_is_open = 0;
84
85         return 0;
86 }
87
88 static ssize_t briq_panel_read(struct file *file, char __user *buf, size_t count,
89                          loff_t *ppos)
90 {
91         unsigned short c;
92         unsigned char cp;
93
94         if (!vfd_is_open)
95                 return -ENODEV;
96
97         c = (inb(BRIQ_PANEL_LED_IOPORT) & 0x000c) | (ledpb & 0x0003);
98         set_led(' ');
99         /* upper button released */
100         if ((!(ledpb & 0x0004)) && (c & 0x0004)) {
101                 cp = ' ';
102                 ledpb = c;
103                 if (copy_to_user(buf, &cp, 1))
104                         return -EFAULT;
105                 return 1;
106         }
107         /* lower button released */
108         else if ((!(ledpb & 0x0008)) && (c & 0x0008)) {
109                 cp = '\r';
110                 ledpb = c;
111                 if (copy_to_user(buf, &cp, 1))
112                         return -EFAULT;
113                 return 1;
114         } else {
115                 ledpb = c;
116                 return 0;
117         }
118 }
119
120 static void scroll_vfd( void )
121 {
122         int     i;
123
124         for (i=0; i<20; i++) {
125                 vfd[i] = vfd[i+20];
126                 vfd[i+20] = ' ';
127         }
128         vfd_cursor = 20;
129 }
130
131 static ssize_t briq_panel_write(struct file *file, const char __user *buf, size_t len,
132                           loff_t *ppos)
133 {
134         size_t indx = len;
135         int i, esc = 0;
136
137         if (!vfd_is_open)
138                 return -EBUSY;
139
140         for (;;) {
141                 char c;
142                 if (!indx)
143                         break;
144                 if (get_user(c, buf))
145                         return -EFAULT;
146                 if (esc) {
147                         set_led(c);
148                         esc = 0;
149                 } else if (c == 27) {
150                         esc = 1;
151                 } else if (c == 12) {
152                         /* do a form feed */
153                         for (i=0; i<40; i++)
154                                 vfd[i] = ' ';
155                         vfd_cursor = 0;
156                 } else if (c == 10) {
157                         if (vfd_cursor < 20)
158                                 vfd_cursor = 20;
159                         else if (vfd_cursor < 40)
160                                 vfd_cursor = 40;
161                         else if (vfd_cursor < 60)
162                                 vfd_cursor = 60;
163                         if (vfd_cursor > 59)
164                                 scroll_vfd();
165                 } else {
166                         /* just a character */
167                         if (vfd_cursor > 39)
168                                 scroll_vfd();
169                         vfd[vfd_cursor++] = c;
170                 }
171                 indx--;
172                 buf++;
173         }
174         update_vfd();
175
176         return len;
177 }
178
179 static const struct file_operations briq_panel_fops = {
180         .owner          = THIS_MODULE,
181         .read           = briq_panel_read,
182         .write          = briq_panel_write,
183         .open           = briq_panel_open,
184         .release        = briq_panel_release,
185 };
186
187 static struct miscdevice briq_panel_miscdev = {
188         BRIQ_PANEL_MINOR,
189         "briq_panel",
190         &briq_panel_fops
191 };
192
193 static int __init briq_panel_init(void)
194 {
195         struct device_node *root = of_find_node_by_path("/");
196         const char *machine;
197         int i;
198
199         machine = of_get_property(root, "model", NULL);
200         if (!machine || strncmp(machine, "TotalImpact,BRIQ-1", 18) != 0) {
201                 of_node_put(root);
202                 return -ENODEV;
203         }
204         of_node_put(root);
205
206         printk(KERN_INFO
207                 "briq_panel: v%s Dr. Karsten Jeppesen (kj@totalimpact.com)\n",
208                 BRIQ_PANEL_VER);
209
210         if (!request_region(BRIQ_PANEL_VFD_IOPORT, 4, "BRIQ Front Panel"))
211                 return -EBUSY;
212
213         if (!request_region(BRIQ_PANEL_LED_IOPORT, 2, "BRIQ Front Panel")) {
214                 release_region(BRIQ_PANEL_VFD_IOPORT, 4);
215                 return -EBUSY;
216         }
217         ledpb = inb(BRIQ_PANEL_LED_IOPORT) & 0x000c;
218
219         if (misc_register(&briq_panel_miscdev) < 0) {
220                 release_region(BRIQ_PANEL_VFD_IOPORT, 4);
221                 release_region(BRIQ_PANEL_LED_IOPORT, 2);
222                 return -EBUSY;
223         }
224
225         outb(0x38, BRIQ_PANEL_VFD_IOPORT);      /* Function set */
226         outb(0x01, BRIQ_PANEL_VFD_IOPORT);      /* Clear display */
227         outb(0x0c, BRIQ_PANEL_VFD_IOPORT);      /* Display on */
228         outb(0x06, BRIQ_PANEL_VFD_IOPORT);      /* Entry normal */
229         for (i=0; i<40; i++)
230                 vfd[i]=' ';
231 #ifndef MODULE
232         vfd[0] = 'L';
233         vfd[1] = 'o';
234         vfd[2] = 'a';
235         vfd[3] = 'd';
236         vfd[4] = 'i';
237         vfd[5] = 'n';
238         vfd[6] = 'g';
239         vfd[7] = ' ';
240         vfd[8] = '.';
241         vfd[9] = '.';
242         vfd[10] = '.';
243 #endif /* !MODULE */
244
245         update_vfd();
246
247         return 0;
248 }
249
250 static void __exit briq_panel_exit(void)
251 {
252         misc_deregister(&briq_panel_miscdev);
253         release_region(BRIQ_PANEL_VFD_IOPORT, 4);
254         release_region(BRIQ_PANEL_LED_IOPORT, 2);
255 }
256
257 module_init(briq_panel_init);
258 module_exit(briq_panel_exit);
259
260 MODULE_LICENSE("GPL");
261 MODULE_AUTHOR("Karsten Jeppesen <karsten@jeppesens.com>");
262 MODULE_DESCRIPTION("Driver for the Total Impact briQ front panel");