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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> | |
a09e64fb RK |
37 | #include <mach/gpio.h> |
38 | #include <mach/keypad.h> | |
39 | #include <mach/menelaus.h> | |
ad4e09b1 | 40 | #include <asm/irq.h> |
a09e64fb | 41 | #include <mach/hardware.h> |
ad4e09b1 | 42 | #include <asm/io.h> |
a09e64fb | 43 | #include <mach/mux.h> |
ad4e09b1 KS |
44 | |
45 | #undef NEW_BOARD_LEARNING_MODE | |
46 | ||
47 | static void omap_kp_tasklet(unsigned long); | |
48 | static void omap_kp_timer(unsigned long); | |
49 | ||
50 | static unsigned char keypad_state[8]; | |
51 | static DEFINE_MUTEX(kp_enable_mutex); | |
52 | static int kp_enable = 1; | |
53 | static int kp_cur_group = -1; | |
54 | ||
55 | struct omap_kp { | |
56 | struct input_dev *input; | |
57 | struct timer_list timer; | |
58 | int irq; | |
59 | unsigned int rows; | |
60 | unsigned int cols; | |
61 | unsigned long delay; | |
62 | unsigned int debounce; | |
63 | }; | |
64 | ||
65 | DECLARE_TASKLET_DISABLED(kp_tasklet, omap_kp_tasklet, 0); | |
66 | ||
67 | static int *keymap; | |
68 | static unsigned int *row_gpios; | |
69 | static unsigned int *col_gpios; | |
70 | ||
71 | #ifdef CONFIG_ARCH_OMAP2 | |
72 | static void set_col_gpio_val(struct omap_kp *omap_kp, u8 value) | |
73 | { | |
74 | int col; | |
75 | for (col = 0; col < omap_kp->cols; col++) { | |
76 | if (value & (1 << col)) | |
77 | omap_set_gpio_dataout(col_gpios[col], 1); | |
78 | else | |
79 | omap_set_gpio_dataout(col_gpios[col], 0); | |
80 | } | |
81 | } | |
82 | ||
83 | static u8 get_row_gpio_val(struct omap_kp *omap_kp) | |
84 | { | |
85 | int row; | |
86 | u8 value = 0; | |
87 | ||
88 | for (row = 0; row < omap_kp->rows; row++) { | |
89 | if (omap_get_gpio_datain(row_gpios[row])) | |
90 | value |= (1 << row); | |
91 | } | |
92 | return value; | |
93 | } | |
94 | #else | |
95 | #define set_col_gpio_val(x, y) do {} while (0) | |
96 | #define get_row_gpio_val(x) 0 | |
97 | #endif | |
98 | ||
7d12e780 | 99 | static irqreturn_t omap_kp_interrupt(int irq, void *dev_id) |
ad4e09b1 KS |
100 | { |
101 | struct omap_kp *omap_kp = dev_id; | |
102 | ||
103 | /* disable keyboard interrupt and schedule for handling */ | |
104 | if (cpu_is_omap24xx()) { | |
105 | int i; | |
106 | for (i = 0; i < omap_kp->rows; i++) | |
107 | disable_irq(OMAP_GPIO_IRQ(row_gpios[i])); | |
108 | } else | |
109 | /* disable keyboard interrupt and schedule for handling */ | |
110 | omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); | |
111 | ||
112 | tasklet_schedule(&kp_tasklet); | |
113 | ||
114 | return IRQ_HANDLED; | |
115 | } | |
116 | ||
117 | static void omap_kp_timer(unsigned long data) | |
118 | { | |
119 | tasklet_schedule(&kp_tasklet); | |
120 | } | |
121 | ||
122 | static void omap_kp_scan_keypad(struct omap_kp *omap_kp, unsigned char *state) | |
123 | { | |
124 | int col = 0; | |
125 | ||
126 | /* read the keypad status */ | |
127 | if (cpu_is_omap24xx()) { | |
128 | int i; | |
129 | for (i = 0; i < omap_kp->rows; i++) | |
130 | disable_irq(OMAP_GPIO_IRQ(row_gpios[i])); | |
131 | ||
132 | /* read the keypad status */ | |
133 | for (col = 0; col < omap_kp->cols; col++) { | |
134 | set_col_gpio_val(omap_kp, ~(1 << col)); | |
135 | state[col] = ~(get_row_gpio_val(omap_kp)) & 0x3f; | |
136 | } | |
137 | set_col_gpio_val(omap_kp, 0); | |
138 | ||
139 | } else { | |
140 | /* disable keyboard interrupt and schedule for handling */ | |
141 | omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); | |
142 | ||
143 | /* read the keypad status */ | |
144 | omap_writew(0xff, OMAP_MPUIO_BASE + OMAP_MPUIO_KBC); | |
145 | for (col = 0; col < omap_kp->cols; col++) { | |
146 | omap_writew(~(1 << col) & 0xff, | |
147 | OMAP_MPUIO_BASE + OMAP_MPUIO_KBC); | |
148 | ||
149 | udelay(omap_kp->delay); | |
150 | ||
151 | state[col] = ~omap_readw(OMAP_MPUIO_BASE + | |
152 | OMAP_MPUIO_KBR_LATCH) & 0xff; | |
153 | } | |
154 | omap_writew(0x00, OMAP_MPUIO_BASE + OMAP_MPUIO_KBC); | |
155 | udelay(2); | |
156 | } | |
157 | } | |
158 | ||
159 | static inline int omap_kp_find_key(int col, int row) | |
160 | { | |
161 | int i, key; | |
162 | ||
163 | key = KEY(col, row, 0); | |
164 | for (i = 0; keymap[i] != 0; i++) | |
165 | if ((keymap[i] & 0xff000000) == key) | |
166 | return keymap[i] & 0x00ffffff; | |
167 | return -1; | |
168 | } | |
169 | ||
170 | static void omap_kp_tasklet(unsigned long data) | |
171 | { | |
172 | struct omap_kp *omap_kp_data = (struct omap_kp *) data; | |
173 | unsigned char new_state[8], changed, key_down = 0; | |
174 | int col, row; | |
175 | int spurious = 0; | |
176 | ||
177 | /* check for any changes */ | |
178 | omap_kp_scan_keypad(omap_kp_data, new_state); | |
179 | ||
180 | /* check for changes and print those */ | |
181 | for (col = 0; col < omap_kp_data->cols; col++) { | |
182 | changed = new_state[col] ^ keypad_state[col]; | |
183 | key_down |= new_state[col]; | |
184 | if (changed == 0) | |
185 | continue; | |
186 | ||
187 | for (row = 0; row < omap_kp_data->rows; row++) { | |
188 | int key; | |
189 | if (!(changed & (1 << row))) | |
190 | continue; | |
191 | #ifdef NEW_BOARD_LEARNING_MODE | |
192 | printk(KERN_INFO "omap-keypad: key %d-%d %s\n", col, | |
193 | row, (new_state[col] & (1 << row)) ? | |
194 | "pressed" : "released"); | |
195 | #else | |
196 | key = omap_kp_find_key(col, row); | |
197 | if (key < 0) { | |
198 | printk(KERN_WARNING | |
199 | "omap-keypad: Spurious key event %d-%d\n", | |
200 | col, row); | |
201 | /* We scan again after a couple of seconds */ | |
202 | spurious = 1; | |
203 | continue; | |
204 | } | |
205 | ||
206 | if (!(kp_cur_group == (key & GROUP_MASK) || | |
207 | kp_cur_group == -1)) | |
208 | continue; | |
209 | ||
210 | kp_cur_group = key & GROUP_MASK; | |
211 | input_report_key(omap_kp_data->input, key & ~GROUP_MASK, | |
212 | new_state[col] & (1 << row)); | |
213 | #endif | |
214 | } | |
215 | } | |
216 | memcpy(keypad_state, new_state, sizeof(keypad_state)); | |
217 | ||
218 | if (key_down) { | |
219 | int delay = HZ / 20; | |
220 | /* some key is pressed - keep irq disabled and use timer | |
221 | * to poll the keypad */ | |
222 | if (spurious) | |
223 | delay = 2 * HZ; | |
224 | mod_timer(&omap_kp_data->timer, jiffies + delay); | |
225 | } else { | |
226 | /* enable interrupts */ | |
227 | if (cpu_is_omap24xx()) { | |
228 | int i; | |
229 | for (i = 0; i < omap_kp_data->rows; i++) | |
230 | enable_irq(OMAP_GPIO_IRQ(row_gpios[i])); | |
231 | } else { | |
232 | omap_writew(0, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); | |
233 | kp_cur_group = -1; | |
234 | } | |
9360353f | 235 | } |
ad4e09b1 KS |
236 | } |
237 | ||
238 | static ssize_t omap_kp_enable_show(struct device *dev, | |
239 | struct device_attribute *attr, char *buf) | |
240 | { | |
241 | return sprintf(buf, "%u\n", kp_enable); | |
242 | } | |
243 | ||
244 | static ssize_t omap_kp_enable_store(struct device *dev, struct device_attribute *attr, | |
245 | const char *buf, size_t count) | |
246 | { | |
247 | int state; | |
248 | ||
249 | if (sscanf(buf, "%u", &state) != 1) | |
250 | return -EINVAL; | |
251 | ||
252 | if ((state != 1) && (state != 0)) | |
253 | return -EINVAL; | |
254 | ||
255 | mutex_lock(&kp_enable_mutex); | |
256 | if (state != kp_enable) { | |
257 | if (state) | |
258 | enable_irq(INT_KEYBOARD); | |
259 | else | |
260 | disable_irq(INT_KEYBOARD); | |
261 | kp_enable = state; | |
262 | } | |
263 | mutex_unlock(&kp_enable_mutex); | |
264 | ||
265 | return strnlen(buf, count); | |
266 | } | |
267 | ||
268 | static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, omap_kp_enable_show, omap_kp_enable_store); | |
269 | ||
270 | #ifdef CONFIG_PM | |
271 | static int omap_kp_suspend(struct platform_device *dev, pm_message_t state) | |
272 | { | |
273 | /* Nothing yet */ | |
274 | ||
275 | return 0; | |
276 | } | |
277 | ||
278 | static int omap_kp_resume(struct platform_device *dev) | |
279 | { | |
280 | /* Nothing yet */ | |
281 | ||
282 | return 0; | |
283 | } | |
284 | #else | |
285 | #define omap_kp_suspend NULL | |
286 | #define omap_kp_resume NULL | |
287 | #endif | |
288 | ||
289 | static int __init omap_kp_probe(struct platform_device *pdev) | |
290 | { | |
291 | struct omap_kp *omap_kp; | |
292 | struct input_dev *input_dev; | |
293 | struct omap_kp_platform_data *pdata = pdev->dev.platform_data; | |
294 | int i, col_idx, row_idx, irq_idx, ret; | |
295 | ||
296 | if (!pdata->rows || !pdata->cols || !pdata->keymap) { | |
297 | printk(KERN_ERR "No rows, cols or keymap from pdata\n"); | |
298 | return -EINVAL; | |
299 | } | |
300 | ||
301 | omap_kp = kzalloc(sizeof(struct omap_kp), GFP_KERNEL); | |
302 | input_dev = input_allocate_device(); | |
303 | if (!omap_kp || !input_dev) { | |
304 | kfree(omap_kp); | |
305 | input_free_device(input_dev); | |
306 | return -ENOMEM; | |
307 | } | |
308 | ||
309 | platform_set_drvdata(pdev, omap_kp); | |
310 | ||
311 | omap_kp->input = input_dev; | |
312 | ||
313 | /* Disable the interrupt for the MPUIO keyboard */ | |
314 | if (!cpu_is_omap24xx()) | |
315 | omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); | |
316 | ||
317 | keymap = pdata->keymap; | |
318 | ||
319 | if (pdata->rep) | |
9360353f | 320 | __set_bit(EV_REP, input_dev->evbit); |
ad4e09b1 KS |
321 | |
322 | if (pdata->delay) | |
323 | omap_kp->delay = pdata->delay; | |
324 | ||
325 | if (pdata->row_gpios && pdata->col_gpios) { | |
326 | row_gpios = pdata->row_gpios; | |
327 | col_gpios = pdata->col_gpios; | |
328 | } | |
329 | ||
330 | omap_kp->rows = pdata->rows; | |
331 | omap_kp->cols = pdata->cols; | |
332 | ||
333 | if (cpu_is_omap24xx()) { | |
334 | /* Cols: outputs */ | |
335 | for (col_idx = 0; col_idx < omap_kp->cols; col_idx++) { | |
336 | if (omap_request_gpio(col_gpios[col_idx]) < 0) { | |
337 | printk(KERN_ERR "Failed to request" | |
338 | "GPIO%d for keypad\n", | |
339 | col_gpios[col_idx]); | |
340 | goto err1; | |
341 | } | |
342 | omap_set_gpio_direction(col_gpios[col_idx], 0); | |
343 | } | |
344 | /* Rows: inputs */ | |
345 | for (row_idx = 0; row_idx < omap_kp->rows; row_idx++) { | |
346 | if (omap_request_gpio(row_gpios[row_idx]) < 0) { | |
347 | printk(KERN_ERR "Failed to request" | |
348 | "GPIO%d for keypad\n", | |
349 | row_gpios[row_idx]); | |
350 | goto err2; | |
351 | } | |
352 | omap_set_gpio_direction(row_gpios[row_idx], 1); | |
353 | } | |
da3e4c88 DB |
354 | } else { |
355 | col_idx = 0; | |
356 | row_idx = 0; | |
ad4e09b1 KS |
357 | } |
358 | ||
359 | setup_timer(&omap_kp->timer, omap_kp_timer, (unsigned long)omap_kp); | |
360 | ||
361 | /* get the irq and init timer*/ | |
362 | tasklet_enable(&kp_tasklet); | |
363 | kp_tasklet.data = (unsigned long) omap_kp; | |
364 | ||
365 | ret = device_create_file(&pdev->dev, &dev_attr_enable); | |
366 | if (ret < 0) | |
367 | goto err2; | |
368 | ||
369 | /* setup input device */ | |
9360353f | 370 | __set_bit(EV_KEY, input_dev->evbit); |
ad4e09b1 | 371 | for (i = 0; keymap[i] != 0; i++) |
9360353f | 372 | __set_bit(keymap[i] & KEY_MAX, input_dev->keybit); |
ad4e09b1 KS |
373 | input_dev->name = "omap-keypad"; |
374 | input_dev->phys = "omap-keypad/input0"; | |
469ba4df | 375 | input_dev->dev.parent = &pdev->dev; |
ad4e09b1 KS |
376 | |
377 | input_dev->id.bustype = BUS_HOST; | |
378 | input_dev->id.vendor = 0x0001; | |
379 | input_dev->id.product = 0x0001; | |
380 | input_dev->id.version = 0x0100; | |
381 | ||
ad4e09b1 KS |
382 | ret = input_register_device(omap_kp->input); |
383 | if (ret < 0) { | |
384 | printk(KERN_ERR "Unable to register omap-keypad input device\n"); | |
385 | goto err3; | |
386 | } | |
387 | ||
388 | if (pdata->dbounce) | |
389 | omap_writew(0xff, OMAP_MPUIO_BASE + OMAP_MPUIO_GPIO_DEBOUNCING); | |
390 | ||
391 | /* scan current status and enable interrupt */ | |
392 | omap_kp_scan_keypad(omap_kp, keypad_state); | |
393 | if (!cpu_is_omap24xx()) { | |
394 | omap_kp->irq = platform_get_irq(pdev, 0); | |
395 | if (omap_kp->irq >= 0) { | |
396 | if (request_irq(omap_kp->irq, omap_kp_interrupt, 0, | |
397 | "omap-keypad", omap_kp) < 0) | |
398 | goto err4; | |
399 | } | |
400 | omap_writew(0, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); | |
401 | } else { | |
402 | for (irq_idx = 0; irq_idx < omap_kp->rows; irq_idx++) { | |
403 | if (request_irq(OMAP_GPIO_IRQ(row_gpios[irq_idx]), | |
9360353f | 404 | omap_kp_interrupt, |
ad4e09b1 | 405 | IRQF_TRIGGER_FALLING, |
9360353f | 406 | "omap-keypad", omap_kp) < 0) |
ad4e09b1 KS |
407 | goto err5; |
408 | } | |
409 | } | |
410 | return 0; | |
411 | err5: | |
9360353f | 412 | for (i = irq_idx - 1; i >=0; i--) |
ad4e09b1 KS |
413 | free_irq(row_gpios[i], 0); |
414 | err4: | |
415 | input_unregister_device(omap_kp->input); | |
416 | input_dev = NULL; | |
417 | err3: | |
418 | device_remove_file(&pdev->dev, &dev_attr_enable); | |
419 | err2: | |
da3e4c88 | 420 | for (i = row_idx - 1; i >=0; i--) |
ad4e09b1 KS |
421 | omap_free_gpio(row_gpios[i]); |
422 | err1: | |
da3e4c88 | 423 | for (i = col_idx - 1; i >=0; i--) |
ad4e09b1 KS |
424 | omap_free_gpio(col_gpios[i]); |
425 | ||
426 | kfree(omap_kp); | |
427 | input_free_device(input_dev); | |
428 | ||
429 | return -EINVAL; | |
430 | } | |
431 | ||
432 | static int omap_kp_remove(struct platform_device *pdev) | |
433 | { | |
434 | struct omap_kp *omap_kp = platform_get_drvdata(pdev); | |
435 | ||
436 | /* disable keypad interrupt handling */ | |
437 | tasklet_disable(&kp_tasklet); | |
438 | if (cpu_is_omap24xx()) { | |
439 | int i; | |
440 | for (i = 0; i < omap_kp->cols; i++) | |
9360353f | 441 | omap_free_gpio(col_gpios[i]); |
ad4e09b1 | 442 | for (i = 0; i < omap_kp->rows; i++) { |
9360353f | 443 | omap_free_gpio(row_gpios[i]); |
ad4e09b1 KS |
444 | free_irq(OMAP_GPIO_IRQ(row_gpios[i]), 0); |
445 | } | |
446 | } else { | |
447 | omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); | |
448 | free_irq(omap_kp->irq, 0); | |
449 | } | |
450 | ||
451 | del_timer_sync(&omap_kp->timer); | |
452 | tasklet_kill(&kp_tasklet); | |
453 | ||
454 | /* unregister everything */ | |
455 | input_unregister_device(omap_kp->input); | |
456 | ||
457 | kfree(omap_kp); | |
458 | ||
459 | return 0; | |
460 | } | |
461 | ||
462 | static struct platform_driver omap_kp_driver = { | |
463 | .probe = omap_kp_probe, | |
464 | .remove = omap_kp_remove, | |
465 | .suspend = omap_kp_suspend, | |
466 | .resume = omap_kp_resume, | |
467 | .driver = { | |
468 | .name = "omap-keypad", | |
d7b5247b | 469 | .owner = THIS_MODULE, |
ad4e09b1 KS |
470 | }, |
471 | }; | |
472 | ||
473 | static int __devinit omap_kp_init(void) | |
474 | { | |
475 | printk(KERN_INFO "OMAP Keypad Driver\n"); | |
476 | return platform_driver_register(&omap_kp_driver); | |
477 | } | |
478 | ||
479 | static void __exit omap_kp_exit(void) | |
480 | { | |
481 | platform_driver_unregister(&omap_kp_driver); | |
482 | } | |
483 | ||
484 | module_init(omap_kp_init); | |
485 | module_exit(omap_kp_exit); | |
486 | ||
96de0e25 | 487 | MODULE_AUTHOR("Timo Teräs"); |
ad4e09b1 KS |
488 | MODULE_DESCRIPTION("OMAP Keypad Driver"); |
489 | MODULE_LICENSE("GPL"); | |
d7b5247b | 490 | MODULE_ALIAS("platform:omap-keypad"); |