input: misc: cm3218: suspend/resume state maintenance
[linux-2.6.git] / Documentation / auxdisplay / cfag12864b-example.c
1 /*
2  *    Filename: cfag12864b-example.c
3  *     Version: 0.1.0
4  * Description: cfag12864b LCD userspace example program
5  *     License: GPLv2
6  *
7  *      Author: Copyright (C) Miguel Ojeda Sandonis
8  *        Date: 2006-10-31
9  *
10  *  This program is free software; you can redistribute it and/or modify
11  *  it under the terms of the GNU General Public License version 2 as
12  *  published by the Free Software Foundation.
13  *
14  *  This program is distributed in the hope that it will be useful,
15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17  *  GNU General Public License for more details.
18  *
19  *  You should have received a copy of the GNU General Public License
20  *  along with this program; if not, write to the Free Software
21  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
22  *
23  */
24
25 /*
26  * ------------------------
27  * start of cfag12864b code
28  * ------------------------
29  */
30
31 #include <string.h>
32 #include <fcntl.h>
33 #include <unistd.h>
34 #include <sys/types.h>
35 #include <sys/stat.h>
36 #include <sys/mman.h>
37
38 #define CFAG12864B_WIDTH                (128)
39 #define CFAG12864B_HEIGHT               (64)
40 #define CFAG12864B_SIZE                 (128 * 64 / 8)
41 #define CFAG12864B_BPB                  (8)
42 #define CFAG12864B_ADDRESS(x, y)        ((y) * CFAG12864B_WIDTH / \
43                                         CFAG12864B_BPB + (x) / CFAG12864B_BPB)
44 #define CFAG12864B_BIT(n)               (((unsigned char) 1) << (n))
45
46 #undef CFAG12864B_DOCHECK
47 #ifdef CFAG12864B_DOCHECK
48         #define CFAG12864B_CHECK(x, y)          ((x) < CFAG12864B_WIDTH && \
49                                                 (y) < CFAG12864B_HEIGHT)
50 #else
51         #define CFAG12864B_CHECK(x, y)          (1)
52 #endif
53
54 int cfag12864b_fd;
55 unsigned char * cfag12864b_mem;
56 unsigned char cfag12864b_buffer[CFAG12864B_SIZE];
57
58 /*
59  * init a cfag12864b framebuffer device
60  *
61  * No error:       return = 0
62  * Unable to open: return = -1
63  * Unable to mmap: return = -2
64  */
65 static int cfag12864b_init(char *path)
66 {
67         cfag12864b_fd = open(path, O_RDWR);
68         if (cfag12864b_fd == -1)
69                 return -1;
70
71         cfag12864b_mem = mmap(0, CFAG12864B_SIZE, PROT_READ | PROT_WRITE,
72                 MAP_SHARED, cfag12864b_fd, 0);
73         if (cfag12864b_mem == MAP_FAILED) {
74                 close(cfag12864b_fd);
75                 return -2;
76         }
77
78         return 0;
79 }
80
81 /*
82  * exit a cfag12864b framebuffer device
83  */
84 static void cfag12864b_exit(void)
85 {
86         munmap(cfag12864b_mem, CFAG12864B_SIZE);
87         close(cfag12864b_fd);
88 }
89
90 /*
91  * set (x, y) pixel
92  */
93 static void cfag12864b_set(unsigned char x, unsigned char y)
94 {
95         if (CFAG12864B_CHECK(x, y))
96                 cfag12864b_buffer[CFAG12864B_ADDRESS(x, y)] |=
97                         CFAG12864B_BIT(x % CFAG12864B_BPB);
98 }
99
100 /*
101  * unset (x, y) pixel
102  */
103 static void cfag12864b_unset(unsigned char x, unsigned char y)
104 {
105         if (CFAG12864B_CHECK(x, y))
106                 cfag12864b_buffer[CFAG12864B_ADDRESS(x, y)] &=
107                         ~CFAG12864B_BIT(x % CFAG12864B_BPB);
108 }
109
110 /*
111  * is set (x, y) pixel?
112  *
113  * Pixel off: return = 0
114  * Pixel on:  return = 1
115  */
116 static unsigned char cfag12864b_isset(unsigned char x, unsigned char y)
117 {
118         if (CFAG12864B_CHECK(x, y))
119                 if (cfag12864b_buffer[CFAG12864B_ADDRESS(x, y)] &
120                         CFAG12864B_BIT(x % CFAG12864B_BPB))
121                         return 1;
122
123         return 0;
124 }
125
126 /*
127  * not (x, y) pixel
128  */
129 static void cfag12864b_not(unsigned char x, unsigned char y)
130 {
131         if (cfag12864b_isset(x, y))
132                 cfag12864b_unset(x, y);
133         else
134                 cfag12864b_set(x, y);
135 }
136
137 /*
138  * fill (set all pixels)
139  */
140 static void cfag12864b_fill(void)
141 {
142         unsigned short i;
143
144         for (i = 0; i < CFAG12864B_SIZE; i++)
145                 cfag12864b_buffer[i] = 0xFF;
146 }
147
148 /*
149  * clear (unset all pixels)
150  */
151 static void cfag12864b_clear(void)
152 {
153         unsigned short i;
154
155         for (i = 0; i < CFAG12864B_SIZE; i++)
156                 cfag12864b_buffer[i] = 0;
157 }
158
159 /*
160  * format a [128*64] matrix
161  *
162  * Pixel off: src[i] = 0
163  * Pixel on:  src[i] > 0
164  */
165 static void cfag12864b_format(unsigned char * matrix)
166 {
167         unsigned char i, j, n;
168
169         for (i = 0; i < CFAG12864B_HEIGHT; i++)
170         for (j = 0; j < CFAG12864B_WIDTH / CFAG12864B_BPB; j++) {
171                 cfag12864b_buffer[i * CFAG12864B_WIDTH / CFAG12864B_BPB +
172                         j] = 0;
173                 for (n = 0; n < CFAG12864B_BPB; n++)
174                         if (matrix[i * CFAG12864B_WIDTH +
175                                 j * CFAG12864B_BPB + n])
176                                 cfag12864b_buffer[i * CFAG12864B_WIDTH /
177                                         CFAG12864B_BPB + j] |=
178                                         CFAG12864B_BIT(n);
179         }
180 }
181
182 /*
183  * blit buffer to lcd
184  */
185 static void cfag12864b_blit(void)
186 {
187         memcpy(cfag12864b_mem, cfag12864b_buffer, CFAG12864B_SIZE);
188 }
189
190 /*
191  * ----------------------
192  * end of cfag12864b code
193  * ----------------------
194  */
195
196 #include <stdio.h>
197
198 #define EXAMPLES        6
199
200 static void example(unsigned char n)
201 {
202         unsigned short i, j;
203         unsigned char matrix[CFAG12864B_WIDTH * CFAG12864B_HEIGHT];
204
205         if (n > EXAMPLES)
206                 return;
207
208         printf("Example %i/%i - ", n, EXAMPLES);
209
210         switch (n) {
211         case 1:
212                 printf("Draw points setting bits");
213                 cfag12864b_clear();
214                 for (i = 0; i < CFAG12864B_WIDTH; i += 2)
215                         for (j = 0; j < CFAG12864B_HEIGHT; j += 2)
216                                 cfag12864b_set(i, j);
217                 break;
218
219         case 2:
220                 printf("Clear the LCD");
221                 cfag12864b_clear();
222                 break;
223
224         case 3:
225                 printf("Draw rows formatting a [128*64] matrix");
226                 memset(matrix, 0, CFAG12864B_WIDTH * CFAG12864B_HEIGHT);
227                 for (i = 0; i < CFAG12864B_WIDTH; i++)
228                         for (j = 0; j < CFAG12864B_HEIGHT; j += 2)
229                                 matrix[j * CFAG12864B_WIDTH + i] = 1;
230                 cfag12864b_format(matrix);
231                 break;
232
233         case 4:
234                 printf("Fill the lcd");
235                 cfag12864b_fill();
236                 break;
237
238         case 5:
239                 printf("Draw columns unsetting bits");
240                 for (i = 0; i < CFAG12864B_WIDTH; i += 2)
241                         for (j = 0; j < CFAG12864B_HEIGHT; j++)
242                                 cfag12864b_unset(i, j);
243                 break;
244
245         case 6:
246                 printf("Do negative not-ing all bits");
247                 for (i = 0; i < CFAG12864B_WIDTH; i++)
248                         for (j = 0; j < CFAG12864B_HEIGHT; j ++)
249                                 cfag12864b_not(i, j);
250                 break;
251         }
252
253         puts(" - [Press Enter]");
254 }
255
256 int main(int argc, char *argv[])
257 {
258         unsigned char n;
259
260         if (argc != 2) {
261                 printf(
262                         "Sintax:  %s fbdev\n"
263                         "Usually: /dev/fb0, /dev/fb1...\n", argv[0]);
264                 return -1;
265         }
266
267         if (cfag12864b_init(argv[1])) {
268                 printf("Can't init %s fbdev\n", argv[1]);
269                 return -2;
270         }
271
272         for (n = 1; n <= EXAMPLES; n++) {
273                 example(n);
274                 cfag12864b_blit();
275                 while (getchar() != '\n');
276         }
277
278         cfag12864b_exit();
279
280         return 0;
281 }