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ad4e09b1 KS |
1 | /* |
2 | * linux/drivers/input/keyboard/omap-keypad.c | |
3 | * | |
4 | * OMAP Keypad Driver | |
5 | * | |
6 | * Copyright (C) 2003 Nokia Corporation | |
96de0e25 | 7 | * Written by Timo Teräs <ext-timo.teras@nokia.com> |
ad4e09b1 KS |
8 | * |
9 | * Added support for H2 & H3 Keypad | |
10 | * Copyright (C) 2004 Texas Instruments | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License as published by | |
14 | * the Free Software Foundation; either version 2 of the License, or | |
15 | * (at your option) any later version. | |
16 | * | |
17 | * This program is distributed in the hope that it will be useful, | |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU General Public License for more details. | |
21 | * | |
22 | * You should have received a copy of the GNU General Public License | |
23 | * along with this program; if not, write to the Free Software | |
24 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
25 | */ | |
26 | ||
27 | #include <linux/module.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/interrupt.h> | |
30 | #include <linux/types.h> | |
31 | #include <linux/input.h> | |
32 | #include <linux/kernel.h> | |
33 | #include <linux/delay.h> | |
34 | #include <linux/platform_device.h> | |
35 | #include <linux/mutex.h> | |
36 | #include <linux/errno.h> | |
37 | #include <asm/arch/gpio.h> | |
38 | #include <asm/arch/keypad.h> | |
39 | #include <asm/arch/menelaus.h> | |
40 | #include <asm/irq.h> | |
41 | #include <asm/hardware.h> | |
42 | #include <asm/io.h> | |
43 | #include <asm/mach-types.h> | |
44 | #include <asm/arch/mux.h> | |
45 | ||
46 | #undef NEW_BOARD_LEARNING_MODE | |
47 | ||
48 | static void omap_kp_tasklet(unsigned long); | |
49 | static void omap_kp_timer(unsigned long); | |
50 | ||
51 | static unsigned char keypad_state[8]; | |
52 | static DEFINE_MUTEX(kp_enable_mutex); | |
53 | static int kp_enable = 1; | |
54 | static int kp_cur_group = -1; | |
55 | ||
56 | struct omap_kp { | |
57 | struct input_dev *input; | |
58 | struct timer_list timer; | |
59 | int irq; | |
60 | unsigned int rows; | |
61 | unsigned int cols; | |
62 | unsigned long delay; | |
63 | unsigned int debounce; | |
64 | }; | |
65 | ||
66 | DECLARE_TASKLET_DISABLED(kp_tasklet, omap_kp_tasklet, 0); | |
67 | ||
68 | static int *keymap; | |
69 | static unsigned int *row_gpios; | |
70 | static unsigned int *col_gpios; | |
71 | ||
72 | #ifdef CONFIG_ARCH_OMAP2 | |
73 | static void set_col_gpio_val(struct omap_kp *omap_kp, u8 value) | |
74 | { | |
75 | int col; | |
76 | for (col = 0; col < omap_kp->cols; col++) { | |
77 | if (value & (1 << col)) | |
78 | omap_set_gpio_dataout(col_gpios[col], 1); | |
79 | else | |
80 | omap_set_gpio_dataout(col_gpios[col], 0); | |
81 | } | |
82 | } | |
83 | ||
84 | static u8 get_row_gpio_val(struct omap_kp *omap_kp) | |
85 | { | |
86 | int row; | |
87 | u8 value = 0; | |
88 | ||
89 | for (row = 0; row < omap_kp->rows; row++) { | |
90 | if (omap_get_gpio_datain(row_gpios[row])) | |
91 | value |= (1 << row); | |
92 | } | |
93 | return value; | |
94 | } | |
95 | #else | |
96 | #define set_col_gpio_val(x, y) do {} while (0) | |
97 | #define get_row_gpio_val(x) 0 | |
98 | #endif | |
99 | ||
7d12e780 | 100 | static irqreturn_t omap_kp_interrupt(int irq, void *dev_id) |
ad4e09b1 KS |
101 | { |
102 | struct omap_kp *omap_kp = dev_id; | |
103 | ||
104 | /* disable keyboard interrupt and schedule for handling */ | |
105 | if (cpu_is_omap24xx()) { | |
106 | int i; | |
107 | for (i = 0; i < omap_kp->rows; i++) | |
108 | disable_irq(OMAP_GPIO_IRQ(row_gpios[i])); | |
109 | } else | |
110 | /* disable keyboard interrupt and schedule for handling */ | |
111 | omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); | |
112 | ||
113 | tasklet_schedule(&kp_tasklet); | |
114 | ||
115 | return IRQ_HANDLED; | |
116 | } | |
117 | ||
118 | static void omap_kp_timer(unsigned long data) | |
119 | { | |
120 | tasklet_schedule(&kp_tasklet); | |
121 | } | |
122 | ||
123 | static void omap_kp_scan_keypad(struct omap_kp *omap_kp, unsigned char *state) | |
124 | { | |
125 | int col = 0; | |
126 | ||
127 | /* read the keypad status */ | |
128 | if (cpu_is_omap24xx()) { | |
129 | int i; | |
130 | for (i = 0; i < omap_kp->rows; i++) | |
131 | disable_irq(OMAP_GPIO_IRQ(row_gpios[i])); | |
132 | ||
133 | /* read the keypad status */ | |
134 | for (col = 0; col < omap_kp->cols; col++) { | |
135 | set_col_gpio_val(omap_kp, ~(1 << col)); | |
136 | state[col] = ~(get_row_gpio_val(omap_kp)) & 0x3f; | |
137 | } | |
138 | set_col_gpio_val(omap_kp, 0); | |
139 | ||
140 | } else { | |
141 | /* disable keyboard interrupt and schedule for handling */ | |
142 | omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); | |
143 | ||
144 | /* read the keypad status */ | |
145 | omap_writew(0xff, OMAP_MPUIO_BASE + OMAP_MPUIO_KBC); | |
146 | for (col = 0; col < omap_kp->cols; col++) { | |
147 | omap_writew(~(1 << col) & 0xff, | |
148 | OMAP_MPUIO_BASE + OMAP_MPUIO_KBC); | |
149 | ||
150 | udelay(omap_kp->delay); | |
151 | ||
152 | state[col] = ~omap_readw(OMAP_MPUIO_BASE + | |
153 | OMAP_MPUIO_KBR_LATCH) & 0xff; | |
154 | } | |
155 | omap_writew(0x00, OMAP_MPUIO_BASE + OMAP_MPUIO_KBC); | |
156 | udelay(2); | |
157 | } | |
158 | } | |
159 | ||
160 | static inline int omap_kp_find_key(int col, int row) | |
161 | { | |
162 | int i, key; | |
163 | ||
164 | key = KEY(col, row, 0); | |
165 | for (i = 0; keymap[i] != 0; i++) | |
166 | if ((keymap[i] & 0xff000000) == key) | |
167 | return keymap[i] & 0x00ffffff; | |
168 | return -1; | |
169 | } | |
170 | ||
171 | static void omap_kp_tasklet(unsigned long data) | |
172 | { | |
173 | struct omap_kp *omap_kp_data = (struct omap_kp *) data; | |
174 | unsigned char new_state[8], changed, key_down = 0; | |
175 | int col, row; | |
176 | int spurious = 0; | |
177 | ||
178 | /* check for any changes */ | |
179 | omap_kp_scan_keypad(omap_kp_data, new_state); | |
180 | ||
181 | /* check for changes and print those */ | |
182 | for (col = 0; col < omap_kp_data->cols; col++) { | |
183 | changed = new_state[col] ^ keypad_state[col]; | |
184 | key_down |= new_state[col]; | |
185 | if (changed == 0) | |
186 | continue; | |
187 | ||
188 | for (row = 0; row < omap_kp_data->rows; row++) { | |
189 | int key; | |
190 | if (!(changed & (1 << row))) | |
191 | continue; | |
192 | #ifdef NEW_BOARD_LEARNING_MODE | |
193 | printk(KERN_INFO "omap-keypad: key %d-%d %s\n", col, | |
194 | row, (new_state[col] & (1 << row)) ? | |
195 | "pressed" : "released"); | |
196 | #else | |
197 | key = omap_kp_find_key(col, row); | |
198 | if (key < 0) { | |
199 | printk(KERN_WARNING | |
200 | "omap-keypad: Spurious key event %d-%d\n", | |
201 | col, row); | |
202 | /* We scan again after a couple of seconds */ | |
203 | spurious = 1; | |
204 | continue; | |
205 | } | |
206 | ||
207 | if (!(kp_cur_group == (key & GROUP_MASK) || | |
208 | kp_cur_group == -1)) | |
209 | continue; | |
210 | ||
211 | kp_cur_group = key & GROUP_MASK; | |
212 | input_report_key(omap_kp_data->input, key & ~GROUP_MASK, | |
213 | new_state[col] & (1 << row)); | |
214 | #endif | |
215 | } | |
216 | } | |
217 | memcpy(keypad_state, new_state, sizeof(keypad_state)); | |
218 | ||
219 | if (key_down) { | |
220 | int delay = HZ / 20; | |
221 | /* some key is pressed - keep irq disabled and use timer | |
222 | * to poll the keypad */ | |
223 | if (spurious) | |
224 | delay = 2 * HZ; | |
225 | mod_timer(&omap_kp_data->timer, jiffies + delay); | |
226 | } else { | |
227 | /* enable interrupts */ | |
228 | if (cpu_is_omap24xx()) { | |
229 | int i; | |
230 | for (i = 0; i < omap_kp_data->rows; i++) | |
231 | enable_irq(OMAP_GPIO_IRQ(row_gpios[i])); | |
232 | } else { | |
233 | omap_writew(0, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); | |
234 | kp_cur_group = -1; | |
235 | } | |
9360353f | 236 | } |
ad4e09b1 KS |
237 | } |
238 | ||
239 | static ssize_t omap_kp_enable_show(struct device *dev, | |
240 | struct device_attribute *attr, char *buf) | |
241 | { | |
242 | return sprintf(buf, "%u\n", kp_enable); | |
243 | } | |
244 | ||
245 | static ssize_t omap_kp_enable_store(struct device *dev, struct device_attribute *attr, | |
246 | const char *buf, size_t count) | |
247 | { | |
248 | int state; | |
249 | ||
250 | if (sscanf(buf, "%u", &state) != 1) | |
251 | return -EINVAL; | |
252 | ||
253 | if ((state != 1) && (state != 0)) | |
254 | return -EINVAL; | |
255 | ||
256 | mutex_lock(&kp_enable_mutex); | |
257 | if (state != kp_enable) { | |
258 | if (state) | |
259 | enable_irq(INT_KEYBOARD); | |
260 | else | |
261 | disable_irq(INT_KEYBOARD); | |
262 | kp_enable = state; | |
263 | } | |
264 | mutex_unlock(&kp_enable_mutex); | |
265 | ||
266 | return strnlen(buf, count); | |
267 | } | |
268 | ||
269 | static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, omap_kp_enable_show, omap_kp_enable_store); | |
270 | ||
271 | #ifdef CONFIG_PM | |
272 | static int omap_kp_suspend(struct platform_device *dev, pm_message_t state) | |
273 | { | |
274 | /* Nothing yet */ | |
275 | ||
276 | return 0; | |
277 | } | |
278 | ||
279 | static int omap_kp_resume(struct platform_device *dev) | |
280 | { | |
281 | /* Nothing yet */ | |
282 | ||
283 | return 0; | |
284 | } | |
285 | #else | |
286 | #define omap_kp_suspend NULL | |
287 | #define omap_kp_resume NULL | |
288 | #endif | |
289 | ||
290 | static int __init omap_kp_probe(struct platform_device *pdev) | |
291 | { | |
292 | struct omap_kp *omap_kp; | |
293 | struct input_dev *input_dev; | |
294 | struct omap_kp_platform_data *pdata = pdev->dev.platform_data; | |
295 | int i, col_idx, row_idx, irq_idx, ret; | |
296 | ||
297 | if (!pdata->rows || !pdata->cols || !pdata->keymap) { | |
298 | printk(KERN_ERR "No rows, cols or keymap from pdata\n"); | |
299 | return -EINVAL; | |
300 | } | |
301 | ||
302 | omap_kp = kzalloc(sizeof(struct omap_kp), GFP_KERNEL); | |
303 | input_dev = input_allocate_device(); | |
304 | if (!omap_kp || !input_dev) { | |
305 | kfree(omap_kp); | |
306 | input_free_device(input_dev); | |
307 | return -ENOMEM; | |
308 | } | |
309 | ||
310 | platform_set_drvdata(pdev, omap_kp); | |
311 | ||
312 | omap_kp->input = input_dev; | |
313 | ||
314 | /* Disable the interrupt for the MPUIO keyboard */ | |
315 | if (!cpu_is_omap24xx()) | |
316 | omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); | |
317 | ||
318 | keymap = pdata->keymap; | |
319 | ||
320 | if (pdata->rep) | |
9360353f | 321 | __set_bit(EV_REP, input_dev->evbit); |
ad4e09b1 KS |
322 | |
323 | if (pdata->delay) | |
324 | omap_kp->delay = pdata->delay; | |
325 | ||
326 | if (pdata->row_gpios && pdata->col_gpios) { | |
327 | row_gpios = pdata->row_gpios; | |
328 | col_gpios = pdata->col_gpios; | |
329 | } | |
330 | ||
331 | omap_kp->rows = pdata->rows; | |
332 | omap_kp->cols = pdata->cols; | |
333 | ||
334 | if (cpu_is_omap24xx()) { | |
335 | /* Cols: outputs */ | |
336 | for (col_idx = 0; col_idx < omap_kp->cols; col_idx++) { | |
337 | if (omap_request_gpio(col_gpios[col_idx]) < 0) { | |
338 | printk(KERN_ERR "Failed to request" | |
339 | "GPIO%d for keypad\n", | |
340 | col_gpios[col_idx]); | |
341 | goto err1; | |
342 | } | |
343 | omap_set_gpio_direction(col_gpios[col_idx], 0); | |
344 | } | |
345 | /* Rows: inputs */ | |
346 | for (row_idx = 0; row_idx < omap_kp->rows; row_idx++) { | |
347 | if (omap_request_gpio(row_gpios[row_idx]) < 0) { | |
348 | printk(KERN_ERR "Failed to request" | |
349 | "GPIO%d for keypad\n", | |
350 | row_gpios[row_idx]); | |
351 | goto err2; | |
352 | } | |
353 | omap_set_gpio_direction(row_gpios[row_idx], 1); | |
354 | } | |
355 | } | |
356 | ||
357 | setup_timer(&omap_kp->timer, omap_kp_timer, (unsigned long)omap_kp); | |
358 | ||
359 | /* get the irq and init timer*/ | |
360 | tasklet_enable(&kp_tasklet); | |
361 | kp_tasklet.data = (unsigned long) omap_kp; | |
362 | ||
363 | ret = device_create_file(&pdev->dev, &dev_attr_enable); | |
364 | if (ret < 0) | |
365 | goto err2; | |
366 | ||
367 | /* setup input device */ | |
9360353f | 368 | __set_bit(EV_KEY, input_dev->evbit); |
ad4e09b1 | 369 | for (i = 0; keymap[i] != 0; i++) |
9360353f | 370 | __set_bit(keymap[i] & KEY_MAX, input_dev->keybit); |
ad4e09b1 KS |
371 | input_dev->name = "omap-keypad"; |
372 | input_dev->phys = "omap-keypad/input0"; | |
469ba4df | 373 | input_dev->dev.parent = &pdev->dev; |
ad4e09b1 KS |
374 | |
375 | input_dev->id.bustype = BUS_HOST; | |
376 | input_dev->id.vendor = 0x0001; | |
377 | input_dev->id.product = 0x0001; | |
378 | input_dev->id.version = 0x0100; | |
379 | ||
ad4e09b1 KS |
380 | ret = input_register_device(omap_kp->input); |
381 | if (ret < 0) { | |
382 | printk(KERN_ERR "Unable to register omap-keypad input device\n"); | |
383 | goto err3; | |
384 | } | |
385 | ||
386 | if (pdata->dbounce) | |
387 | omap_writew(0xff, OMAP_MPUIO_BASE + OMAP_MPUIO_GPIO_DEBOUNCING); | |
388 | ||
389 | /* scan current status and enable interrupt */ | |
390 | omap_kp_scan_keypad(omap_kp, keypad_state); | |
391 | if (!cpu_is_omap24xx()) { | |
392 | omap_kp->irq = platform_get_irq(pdev, 0); | |
393 | if (omap_kp->irq >= 0) { | |
394 | if (request_irq(omap_kp->irq, omap_kp_interrupt, 0, | |
395 | "omap-keypad", omap_kp) < 0) | |
396 | goto err4; | |
397 | } | |
398 | omap_writew(0, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); | |
399 | } else { | |
400 | for (irq_idx = 0; irq_idx < omap_kp->rows; irq_idx++) { | |
401 | if (request_irq(OMAP_GPIO_IRQ(row_gpios[irq_idx]), | |
9360353f | 402 | omap_kp_interrupt, |
ad4e09b1 | 403 | IRQF_TRIGGER_FALLING, |
9360353f | 404 | "omap-keypad", omap_kp) < 0) |
ad4e09b1 KS |
405 | goto err5; |
406 | } | |
407 | } | |
408 | return 0; | |
409 | err5: | |
9360353f | 410 | for (i = irq_idx - 1; i >=0; i--) |
ad4e09b1 KS |
411 | free_irq(row_gpios[i], 0); |
412 | err4: | |
413 | input_unregister_device(omap_kp->input); | |
414 | input_dev = NULL; | |
415 | err3: | |
416 | device_remove_file(&pdev->dev, &dev_attr_enable); | |
417 | err2: | |
418 | for (i = row_idx-1; i >=0; i--) | |
419 | omap_free_gpio(row_gpios[i]); | |
420 | err1: | |
421 | for (i = col_idx-1; i >=0; i--) | |
422 | omap_free_gpio(col_gpios[i]); | |
423 | ||
424 | kfree(omap_kp); | |
425 | input_free_device(input_dev); | |
426 | ||
427 | return -EINVAL; | |
428 | } | |
429 | ||
430 | static int omap_kp_remove(struct platform_device *pdev) | |
431 | { | |
432 | struct omap_kp *omap_kp = platform_get_drvdata(pdev); | |
433 | ||
434 | /* disable keypad interrupt handling */ | |
435 | tasklet_disable(&kp_tasklet); | |
436 | if (cpu_is_omap24xx()) { | |
437 | int i; | |
438 | for (i = 0; i < omap_kp->cols; i++) | |
9360353f | 439 | omap_free_gpio(col_gpios[i]); |
ad4e09b1 | 440 | for (i = 0; i < omap_kp->rows; i++) { |
9360353f | 441 | omap_free_gpio(row_gpios[i]); |
ad4e09b1 KS |
442 | free_irq(OMAP_GPIO_IRQ(row_gpios[i]), 0); |
443 | } | |
444 | } else { | |
445 | omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); | |
446 | free_irq(omap_kp->irq, 0); | |
447 | } | |
448 | ||
449 | del_timer_sync(&omap_kp->timer); | |
450 | tasklet_kill(&kp_tasklet); | |
451 | ||
452 | /* unregister everything */ | |
453 | input_unregister_device(omap_kp->input); | |
454 | ||
455 | kfree(omap_kp); | |
456 | ||
457 | return 0; | |
458 | } | |
459 | ||
460 | static struct platform_driver omap_kp_driver = { | |
461 | .probe = omap_kp_probe, | |
462 | .remove = omap_kp_remove, | |
463 | .suspend = omap_kp_suspend, | |
464 | .resume = omap_kp_resume, | |
465 | .driver = { | |
466 | .name = "omap-keypad", | |
467 | }, | |
468 | }; | |
469 | ||
470 | static int __devinit omap_kp_init(void) | |
471 | { | |
472 | printk(KERN_INFO "OMAP Keypad Driver\n"); | |
473 | return platform_driver_register(&omap_kp_driver); | |
474 | } | |
475 | ||
476 | static void __exit omap_kp_exit(void) | |
477 | { | |
478 | platform_driver_unregister(&omap_kp_driver); | |
479 | } | |
480 | ||
481 | module_init(omap_kp_init); | |
482 | module_exit(omap_kp_exit); | |
483 | ||
96de0e25 | 484 | MODULE_AUTHOR("Timo Teräs"); |
ad4e09b1 KS |
485 | MODULE_DESCRIPTION("OMAP Keypad Driver"); |
486 | MODULE_LICENSE("GPL"); |