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1 | /* |
2 | * Filename: cfag12864b.c |
3 | * Version: 0.1.0 |
4 | * Description: cfag12864b LCD driver |
5 | * License: GPLv2 |
6 | * Depends: ks0108 |
7 | * |
8 | * Author: Copyright (C) Miguel Ojeda Sandonis |
9 | * Date: 2006-10-31 |
10 | * |
11 | * This program is free software; you can redistribute it and/or modify |
12 | * it under the terms of the GNU General Public License version 2 as |
13 | * published by the Free Software Foundation. |
14 | * |
15 | * This program is distributed in the hope that it will be useful, |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
18 | * GNU General Public License for more details. |
19 | * |
20 | * You should have received a copy of the GNU General Public License |
21 | * along with this program; if not, write to the Free Software |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
23 | * |
24 | */ |
25 | |
26 | #include <linux/init.h> |
27 | #include <linux/module.h> |
28 | #include <linux/kernel.h> |
29 | #include <linux/fs.h> |
30 | #include <linux/slab.h> |
31 | #include <linux/cdev.h> |
32 | #include <linux/delay.h> |
33 | #include <linux/device.h> |
34 | #include <linux/jiffies.h> |
35 | #include <linux/mutex.h> |
36 | #include <linux/uaccess.h> |
37 | #include <linux/vmalloc.h> |
38 | #include <linux/workqueue.h> |
39 | #include <linux/ks0108.h> |
40 | #include <linux/cfag12864b.h> |
41 | |
42 | |
43 | #define CFAG12864B_NAME "cfag12864b" |
44 | |
45 | /* |
46 | * Module Parameters |
47 | */ |
48 | |
49 | static unsigned int cfag12864b_rate = CONFIG_CFAG12864B_RATE; |
50 | module_param(cfag12864b_rate, uint, S_IRUGO); |
51 | MODULE_PARM_DESC(cfag12864b_rate, |
52 | "Refresh rate (hertz)"); |
53 | |
54 | unsigned int cfag12864b_getrate(void) |
55 | { |
56 | return cfag12864b_rate; |
57 | } |
58 | |
59 | /* |
60 | * cfag12864b Commands |
61 | * |
62 | * E = Enable signal |
63 | * Every time E switch from low to high, |
64 | * cfag12864b/ks0108 reads the command/data. |
65 | * |
66 | * CS1 = First ks0108controller. |
67 | * If high, the first ks0108 controller receives commands/data. |
68 | * |
69 | * CS2 = Second ks0108 controller |
70 | * If high, the second ks0108 controller receives commands/data. |
71 | * |
72 | * DI = Data/Instruction |
73 | * If low, cfag12864b will expect commands. |
74 | * If high, cfag12864b will expect data. |
75 | * |
76 | */ |
77 | |
78 | #define bit(n) (((unsigned char)1)<<(n)) |
79 | |
80 | #define CFAG12864B_BIT_E (0) |
81 | #define CFAG12864B_BIT_CS1 (2) |
82 | #define CFAG12864B_BIT_CS2 (1) |
83 | #define CFAG12864B_BIT_DI (3) |
84 | |
85 | static unsigned char cfag12864b_state; |
86 | |
87 | static void cfag12864b_set(void) |
88 | { |
89 | ks0108_writecontrol(cfag12864b_state); |
90 | } |
91 | |
92 | static void cfag12864b_setbit(unsigned char state, unsigned char n) |
93 | { |
94 | if (state) |
95 | cfag12864b_state |= bit(n); |
96 | else |
97 | cfag12864b_state &= ~bit(n); |
98 | } |
99 | |
100 | static void cfag12864b_e(unsigned char state) |
101 | { |
102 | cfag12864b_setbit(state, CFAG12864B_BIT_E); |
103 | cfag12864b_set(); |
104 | } |
105 | |
106 | static void cfag12864b_cs1(unsigned char state) |
107 | { |
108 | cfag12864b_setbit(state, CFAG12864B_BIT_CS1); |
109 | } |
110 | |
111 | static void cfag12864b_cs2(unsigned char state) |
112 | { |
113 | cfag12864b_setbit(state, CFAG12864B_BIT_CS2); |
114 | } |
115 | |
116 | static void cfag12864b_di(unsigned char state) |
117 | { |
118 | cfag12864b_setbit(state, CFAG12864B_BIT_DI); |
119 | } |
120 | |
121 | static void cfag12864b_setcontrollers(unsigned char first, |
122 | unsigned char second) |
123 | { |
124 | if (first) |
125 | cfag12864b_cs1(0); |
126 | else |
127 | cfag12864b_cs1(1); |
128 | |
129 | if (second) |
130 | cfag12864b_cs2(0); |
131 | else |
132 | cfag12864b_cs2(1); |
133 | } |
134 | |
135 | static void cfag12864b_controller(unsigned char which) |
136 | { |
137 | if (which == 0) |
138 | cfag12864b_setcontrollers(1, 0); |
139 | else if (which == 1) |
140 | cfag12864b_setcontrollers(0, 1); |
141 | } |
142 | |
143 | static void cfag12864b_displaystate(unsigned char state) |
144 | { |
145 | cfag12864b_di(0); |
146 | cfag12864b_e(1); |
147 | ks0108_displaystate(state); |
148 | cfag12864b_e(0); |
149 | } |
150 | |
151 | static void cfag12864b_address(unsigned char address) |
152 | { |
153 | cfag12864b_di(0); |
154 | cfag12864b_e(1); |
155 | ks0108_address(address); |
156 | cfag12864b_e(0); |
157 | } |
158 | |
159 | static void cfag12864b_page(unsigned char page) |
160 | { |
161 | cfag12864b_di(0); |
162 | cfag12864b_e(1); |
163 | ks0108_page(page); |
164 | cfag12864b_e(0); |
165 | } |
166 | |
167 | static void cfag12864b_startline(unsigned char startline) |
168 | { |
169 | cfag12864b_di(0); |
170 | cfag12864b_e(1); |
171 | ks0108_startline(startline); |
172 | cfag12864b_e(0); |
173 | } |
174 | |
175 | static void cfag12864b_writebyte(unsigned char byte) |
176 | { |
177 | cfag12864b_di(1); |
178 | cfag12864b_e(1); |
179 | ks0108_writedata(byte); |
180 | cfag12864b_e(0); |
181 | } |
182 | |
183 | static void cfag12864b_nop(void) |
184 | { |
185 | cfag12864b_startline(0); |
186 | } |
187 | |
188 | /* |
189 | * cfag12864b Internal Commands |
190 | */ |
191 | |
192 | static void cfag12864b_on(void) |
193 | { |
194 | cfag12864b_setcontrollers(1, 1); |
195 | cfag12864b_displaystate(1); |
196 | } |
197 | |
198 | static void cfag12864b_off(void) |
199 | { |
200 | cfag12864b_setcontrollers(1, 1); |
201 | cfag12864b_displaystate(0); |
202 | } |
203 | |
204 | static void cfag12864b_clear(void) |
205 | { |
206 | unsigned char i, j; |
207 | |
208 | cfag12864b_setcontrollers(1, 1); |
209 | for (i = 0; i < CFAG12864B_PAGES; i++) { |
210 | cfag12864b_page(i); |
211 | cfag12864b_address(0); |
212 | for (j = 0; j < CFAG12864B_ADDRESSES; j++) |
213 | cfag12864b_writebyte(0); |
214 | } |
215 | } |
216 | |
217 | /* |
218 | * Update work |
219 | */ |
220 | |
221 | unsigned char *cfag12864b_buffer; |
222 | static unsigned char *cfag12864b_cache; |
223 | static DEFINE_MUTEX(cfag12864b_mutex); |
224 | static unsigned char cfag12864b_updating; |
225 | static void cfag12864b_update(struct work_struct *delayed_work); |
226 | static struct workqueue_struct *cfag12864b_workqueue; |
227 | static DECLARE_DELAYED_WORK(cfag12864b_work, cfag12864b_update); |
228 | |
229 | static void cfag12864b_queue(void) |
230 | { |
231 | queue_delayed_work(cfag12864b_workqueue, &cfag12864b_work, |
232 | HZ / cfag12864b_rate); |
233 | } |
234 | |
235 | unsigned char cfag12864b_enable(void) |
236 | { |
237 | unsigned char ret; |
238 | |
239 | mutex_lock(&cfag12864b_mutex); |
240 | |
241 | if (!cfag12864b_updating) { |
242 | cfag12864b_updating = 1; |
243 | cfag12864b_queue(); |
244 | ret = 0; |
245 | } else |
246 | ret = 1; |
247 | |
248 | mutex_unlock(&cfag12864b_mutex); |
249 | |
250 | return ret; |
251 | } |
252 | |
253 | void cfag12864b_disable(void) |
254 | { |
255 | mutex_lock(&cfag12864b_mutex); |
256 | |
257 | if (cfag12864b_updating) { |
258 | cfag12864b_updating = 0; |
259 | cancel_delayed_work(&cfag12864b_work); |
260 | flush_workqueue(cfag12864b_workqueue); |
261 | } |
262 | |
263 | mutex_unlock(&cfag12864b_mutex); |
264 | } |
265 | |
266 | unsigned char cfag12864b_isenabled(void) |
267 | { |
268 | return cfag12864b_updating; |
269 | } |
270 | |
271 | static void cfag12864b_update(struct work_struct *work) |
272 | { |
273 | unsigned char c; |
274 | unsigned short i, j, k, b; |
275 | |
276 | if (memcmp(cfag12864b_cache, cfag12864b_buffer, CFAG12864B_SIZE)) { |
277 | for (i = 0; i < CFAG12864B_CONTROLLERS; i++) { |
278 | cfag12864b_controller(i); |
279 | cfag12864b_nop(); |
280 | for (j = 0; j < CFAG12864B_PAGES; j++) { |
281 | cfag12864b_page(j); |
282 | cfag12864b_nop(); |
283 | cfag12864b_address(0); |
284 | cfag12864b_nop(); |
285 | for (k = 0; k < CFAG12864B_ADDRESSES; k++) { |
286 | for (c = 0, b = 0; b < 8; b++) |
287 | if (cfag12864b_buffer |
288 | [i * CFAG12864B_ADDRESSES / 8 |
289 | + k / 8 + (j * 8 + b) * |
290 | CFAG12864B_WIDTH / 8] |
291 | & bit(k % 8)) |
292 | c |= bit(b); |
293 | cfag12864b_writebyte(c); |
294 | } |
295 | } |
296 | } |
297 | |
298 | memcpy(cfag12864b_cache, cfag12864b_buffer, CFAG12864B_SIZE); |
299 | } |
300 | |
301 | if (cfag12864b_updating) |
302 | cfag12864b_queue(); |
303 | } |
304 | |
305 | /* |
306 | * cfag12864b Exported Symbols |
307 | */ |
308 | |
309 | EXPORT_SYMBOL_GPL(cfag12864b_buffer); |
310 | EXPORT_SYMBOL_GPL(cfag12864b_getrate); |
311 | EXPORT_SYMBOL_GPL(cfag12864b_enable); |
312 | EXPORT_SYMBOL_GPL(cfag12864b_disable); |
313 | EXPORT_SYMBOL_GPL(cfag12864b_isenabled); |
314 | |
315 | /* |
316 | * Is the module inited? |
317 | */ |
318 | |
319 | static unsigned char cfag12864b_inited; |
320 | unsigned char cfag12864b_isinited(void) |
321 | { |
322 | return cfag12864b_inited; |
323 | } |
324 | EXPORT_SYMBOL_GPL(cfag12864b_isinited); |
325 | |
326 | /* |
327 | * Module Init & Exit |
328 | */ |
329 | |
330 | static int __init cfag12864b_init(void) |
331 | { |
332 | int ret = -EINVAL; |
333 | |
334 | /* ks0108_init() must be called first */ |
335 | if (!ks0108_isinited()) { |
336 | printk(KERN_ERR CFAG12864B_NAME ": ERROR: " |
337 | "ks0108 is not initialized\n"); |
338 | goto none; |
339 | } |
340 | BUILD_BUG_ON(PAGE_SIZE < CFAG12864B_SIZE); |
341 | |
342 | cfag12864b_buffer = (unsigned char *) get_zeroed_page(GFP_KERNEL); |
343 | if (cfag12864b_buffer == NULL) { |
344 | printk(KERN_ERR CFAG12864B_NAME ": ERROR: " |
345 | "can't get a free page\n"); |
346 | ret = -ENOMEM; |
347 | goto none; |
348 | } |
349 | |
350 | cfag12864b_cache = kmalloc(sizeof(unsigned char) * |
351 | CFAG12864B_SIZE, GFP_KERNEL); |
352 | if (cfag12864b_cache == NULL) { |
353 | printk(KERN_ERR CFAG12864B_NAME ": ERROR: " |
354 | "can't alloc cache buffer (%i bytes)\n", |
355 | CFAG12864B_SIZE); |
356 | ret = -ENOMEM; |
357 | goto bufferalloced; |
358 | } |
359 | |
360 | cfag12864b_workqueue = create_singlethread_workqueue(CFAG12864B_NAME); |
361 | if (cfag12864b_workqueue == NULL) |
362 | goto cachealloced; |
363 | |
364 | cfag12864b_clear(); |
365 | cfag12864b_on(); |
366 | |
367 | cfag12864b_inited = 1; |
368 | return 0; |
369 | |
370 | cachealloced: |
371 | kfree(cfag12864b_cache); |
372 | |
373 | bufferalloced: |
374 | free_page((unsigned long) cfag12864b_buffer); |
375 | |
376 | none: |
377 | return ret; |
378 | } |
379 | |
380 | static void __exit cfag12864b_exit(void) |
381 | { |
382 | cfag12864b_disable(); |
383 | cfag12864b_off(); |
384 | destroy_workqueue(cfag12864b_workqueue); |
385 | kfree(cfag12864b_cache); |
386 | free_page((unsigned long) cfag12864b_buffer); |
387 | } |
388 | |
389 | module_init(cfag12864b_init); |
390 | module_exit(cfag12864b_exit); |
391 | |
392 | MODULE_LICENSE("GPL v2"); |
393 | MODULE_AUTHOR("Miguel Ojeda Sandonis <miguel.ojeda.sandonis@gmail.com>"); |
394 | MODULE_DESCRIPTION("cfag12864b LCD driver"); |
395 |
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