Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-2.6] / arch / powerpc / platforms / powermac / udbg_adb.c
1 #include <linux/string.h>
2 #include <linux/kernel.h>
3 #include <linux/errno.h>
4 #include <linux/bitops.h>
5 #include <linux/ptrace.h>
6 #include <linux/adb.h>
7 #include <linux/pmu.h>
8 #include <linux/cuda.h>
9 #include <asm/machdep.h>
10 #include <asm/io.h>
11 #include <asm/page.h>
12 #include <asm/xmon.h>
13 #include <asm/prom.h>
14 #include <asm/bootx.h>
15 #include <asm/machdep.h>
16 #include <asm/errno.h>
17 #include <asm/pmac_feature.h>
18 #include <asm/processor.h>
19 #include <asm/delay.h>
20 #include <asm/btext.h>
21 #include <asm/time.h>
22 #include <asm/udbg.h>
23
24 /*
25  * This implementation is "special", it can "patch" the current
26  * udbg implementation and work on top of it. It must thus be
27  * initialized last
28  */
29
30 static void (*udbg_adb_old_putc)(char c);
31 static int (*udbg_adb_old_getc)(void);
32 static int (*udbg_adb_old_getc_poll)(void);
33
34 static enum {
35         input_adb_none,
36         input_adb_pmu,
37         input_adb_cuda,
38 } input_type = input_adb_none;
39
40 int xmon_wants_key, xmon_adb_keycode;
41
42 static inline void udbg_adb_poll(void)
43 {
44 #ifdef CONFIG_ADB_PMU
45         if (input_type == input_adb_pmu)
46                 pmu_poll_adb();
47 #endif /* CONFIG_ADB_PMU */
48 #ifdef CONFIG_ADB_CUDA
49         if (input_type == input_adb_cuda)
50                 cuda_poll();
51 #endif /* CONFIG_ADB_CUDA */
52 }
53
54 #ifdef CONFIG_BOOTX_TEXT
55
56 static int udbg_adb_use_btext;
57 static int xmon_adb_shiftstate;
58
59 static unsigned char xmon_keytab[128] =
60         "asdfhgzxcv\000bqwer"                           /* 0x00 - 0x0f */
61         "yt123465=97-80]o"                              /* 0x10 - 0x1f */
62         "u[ip\rlj'k;\\,/nm."                            /* 0x20 - 0x2f */
63         "\t `\177\0\033\0\0\0\0\0\0\0\0\0\0"            /* 0x30 - 0x3f */
64         "\0.\0*\0+\0\0\0\0\0/\r\0-\0"                   /* 0x40 - 0x4f */
65         "\0\0000123456789\0\0\0";                       /* 0x50 - 0x5f */
66
67 static unsigned char xmon_shift_keytab[128] =
68         "ASDFHGZXCV\000BQWER"                           /* 0x00 - 0x0f */
69         "YT!@#$^%+(&_*)}O"                              /* 0x10 - 0x1f */
70         "U{IP\rLJ\"K:|<?NM>"                            /* 0x20 - 0x2f */
71         "\t ~\177\0\033\0\0\0\0\0\0\0\0\0\0"            /* 0x30 - 0x3f */
72         "\0.\0*\0+\0\0\0\0\0/\r\0-\0"                   /* 0x40 - 0x4f */
73         "\0\0000123456789\0\0\0";                       /* 0x50 - 0x5f */
74
75 static int udbg_adb_local_getc(void)
76 {
77         int k, t, on;
78
79         xmon_wants_key = 1;
80         for (;;) {
81                 xmon_adb_keycode = -1;
82                 t = 0;
83                 on = 0;
84                 k = -1;
85                 do {
86                         if (--t < 0) {
87                                 on = 1 - on;
88                                 btext_drawchar(on? 0xdb: 0x20);
89                                 btext_drawchar('\b');
90                                 t = 200000;
91                         }
92                         udbg_adb_poll();
93                         if (udbg_adb_old_getc_poll)
94                                 k = udbg_adb_old_getc_poll();
95                 } while (k == -1 && xmon_adb_keycode == -1);
96                 if (on)
97                         btext_drawstring(" \b");
98                 if (k != -1)
99                         return k;
100                 k = xmon_adb_keycode;
101
102                 /* test for shift keys */
103                 if ((k & 0x7f) == 0x38 || (k & 0x7f) == 0x7b) {
104                         xmon_adb_shiftstate = (k & 0x80) == 0;
105                         continue;
106                 }
107                 if (k >= 0x80)
108                         continue;       /* ignore up transitions */
109                 k = (xmon_adb_shiftstate? xmon_shift_keytab: xmon_keytab)[k];
110                 if (k != 0)
111                         break;
112         }
113         xmon_wants_key = 0;
114         return k;
115 }
116 #endif /* CONFIG_BOOTX_TEXT */
117
118 static int udbg_adb_getc(void)
119 {
120 #ifdef CONFIG_BOOTX_TEXT
121         if (udbg_adb_use_btext && input_type != input_adb_none)
122                 return udbg_adb_local_getc();
123 #endif
124         if (udbg_adb_old_getc)
125                 return udbg_adb_old_getc();
126         return -1;
127 }
128
129 /* getc_poll() is not really used, unless you have the xmon-over modem
130  * hack that doesn't quite concern us here, thus we just poll the low level
131  * ADB driver to prevent it from timing out and call back the original poll
132  * routine.
133  */
134 static int udbg_adb_getc_poll(void)
135 {
136         udbg_adb_poll();
137
138         if (udbg_adb_old_getc_poll)
139                 return udbg_adb_old_getc_poll();
140         return -1;
141 }
142
143 static void udbg_adb_putc(char c)
144 {
145 #ifdef CONFIG_BOOTX_TEXT
146         if (udbg_adb_use_btext)
147                 btext_drawchar(c);
148 #endif
149         if (udbg_adb_old_putc)
150                 return udbg_adb_old_putc(c);
151 }
152
153 void udbg_adb_init_early(void)
154 {
155 #ifdef CONFIG_BOOTX_TEXT
156         if (btext_find_display(1) == 0) {
157                 udbg_adb_use_btext = 1;
158                 udbg_putc = udbg_adb_putc;
159         }
160 #endif
161 }
162
163 int udbg_adb_init(int force_btext)
164 {
165         struct device_node *np;
166
167         /* Capture existing callbacks */
168         udbg_adb_old_putc = udbg_putc;
169         udbg_adb_old_getc = udbg_getc;
170         udbg_adb_old_getc_poll = udbg_getc_poll;
171
172         /* Check if our early init was already called */
173         if (udbg_adb_old_putc == udbg_adb_putc)
174                 udbg_adb_old_putc = NULL;
175 #ifdef CONFIG_BOOTX_TEXT
176         if (udbg_adb_old_putc == btext_drawchar)
177                 udbg_adb_old_putc = NULL;
178 #endif
179
180         /* Set ours as output */
181         udbg_putc = udbg_adb_putc;
182         udbg_getc = udbg_adb_getc;
183         udbg_getc_poll = udbg_adb_getc_poll;
184
185 #ifdef CONFIG_BOOTX_TEXT
186         /* Check if we should use btext output */
187         if (btext_find_display(force_btext) == 0)
188                 udbg_adb_use_btext = 1;
189 #endif
190
191         /* See if there is a keyboard in the device tree with a parent
192          * of type "adb". If not, we return a failure, but we keep the
193          * bext output set for now
194          */
195         for (np = NULL; (np = of_find_node_by_name(np, "keyboard")) != NULL;) {
196                 struct device_node *parent = of_get_parent(np);
197                 int found = (parent && strcmp(parent->type, "adb") == 0);
198                 of_node_put(parent);
199                 if (found)
200                         break;
201         }
202         if (np == NULL)
203                 return -ENODEV;
204         of_node_put(np);
205
206 #ifdef CONFIG_ADB_PMU
207         if (find_via_pmu())
208                 input_type = input_adb_pmu;
209 #endif
210 #ifdef CONFIG_ADB_CUDA
211         if (find_via_cuda())
212                 input_type = input_adb_cuda;
213 #endif
214
215         /* Same as above: nothing found, keep btext set for output */
216         if (input_type == input_adb_none)
217                 return -ENODEV;
218
219         return 0;
220 }