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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> | |
5a0e3ad6 | 37 | #include <linux/slab.h> |
1bc857f7 | 38 | #include <asm/gpio.h> |
ce491cf8 TL |
39 | #include <plat/keypad.h> |
40 | #include <plat/menelaus.h> | |
ad4e09b1 | 41 | #include <asm/irq.h> |
a09e64fb | 42 | #include <mach/hardware.h> |
ad4e09b1 | 43 | #include <asm/io.h> |
ce491cf8 | 44 | #include <plat/mux.h> |
ad4e09b1 KS |
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; | |
1932811f | 64 | unsigned short keymap[]; |
ad4e09b1 KS |
65 | }; |
66 | ||
7c8ad982 | 67 | static DECLARE_TASKLET_DISABLED(kp_tasklet, omap_kp_tasklet, 0); |
ad4e09b1 | 68 | |
ad4e09b1 KS |
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; | |
93a22f8b DB |
76 | |
77 | for (col = 0; col < omap_kp->cols; col++) | |
78 | gpio_set_value(col_gpios[col], value & (1 << col)); | |
ad4e09b1 KS |
79 | } |
80 | ||
81 | static u8 get_row_gpio_val(struct omap_kp *omap_kp) | |
82 | { | |
83 | int row; | |
84 | u8 value = 0; | |
85 | ||
86 | for (row = 0; row < omap_kp->rows; row++) { | |
93a22f8b | 87 | if (gpio_get_value(row_gpios[row])) |
ad4e09b1 KS |
88 | value |= (1 << row); |
89 | } | |
90 | return value; | |
91 | } | |
92 | #else | |
93 | #define set_col_gpio_val(x, y) do {} while (0) | |
94 | #define get_row_gpio_val(x) 0 | |
95 | #endif | |
96 | ||
7d12e780 | 97 | static irqreturn_t omap_kp_interrupt(int irq, void *dev_id) |
ad4e09b1 KS |
98 | { |
99 | struct omap_kp *omap_kp = dev_id; | |
100 | ||
101 | /* disable keyboard interrupt and schedule for handling */ | |
102 | if (cpu_is_omap24xx()) { | |
103 | int i; | |
0f751719 BN |
104 | |
105 | for (i = 0; i < omap_kp->rows; i++) { | |
106 | int gpio_irq = gpio_to_irq(row_gpios[i]); | |
107 | /* | |
108 | * The interrupt which we're currently handling should | |
109 | * be disabled _nosync() to avoid deadlocks waiting | |
110 | * for this handler to complete. All others should | |
111 | * be disabled the regular way for SMP safety. | |
112 | */ | |
113 | if (gpio_irq == irq) | |
114 | disable_irq_nosync(gpio_irq); | |
115 | else | |
116 | disable_irq(gpio_irq); | |
117 | } | |
ad4e09b1 KS |
118 | } else |
119 | /* disable keyboard interrupt and schedule for handling */ | |
6175556f | 120 | omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); |
ad4e09b1 KS |
121 | |
122 | tasklet_schedule(&kp_tasklet); | |
123 | ||
124 | return IRQ_HANDLED; | |
125 | } | |
126 | ||
127 | static void omap_kp_timer(unsigned long data) | |
128 | { | |
129 | tasklet_schedule(&kp_tasklet); | |
130 | } | |
131 | ||
132 | static void omap_kp_scan_keypad(struct omap_kp *omap_kp, unsigned char *state) | |
133 | { | |
134 | int col = 0; | |
135 | ||
136 | /* read the keypad status */ | |
137 | if (cpu_is_omap24xx()) { | |
ad4e09b1 KS |
138 | /* read the keypad status */ |
139 | for (col = 0; col < omap_kp->cols; col++) { | |
140 | set_col_gpio_val(omap_kp, ~(1 << col)); | |
dde4ac07 | 141 | state[col] = ~(get_row_gpio_val(omap_kp)) & 0xff; |
ad4e09b1 KS |
142 | } |
143 | set_col_gpio_val(omap_kp, 0); | |
144 | ||
145 | } else { | |
146 | /* disable keyboard interrupt and schedule for handling */ | |
6175556f | 147 | omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); |
ad4e09b1 KS |
148 | |
149 | /* read the keypad status */ | |
6175556f | 150 | omap_writew(0xff, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC); |
ad4e09b1 KS |
151 | for (col = 0; col < omap_kp->cols; col++) { |
152 | omap_writew(~(1 << col) & 0xff, | |
6175556f | 153 | OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC); |
ad4e09b1 KS |
154 | |
155 | udelay(omap_kp->delay); | |
156 | ||
6175556f | 157 | state[col] = ~omap_readw(OMAP1_MPUIO_BASE + |
ad4e09b1 KS |
158 | OMAP_MPUIO_KBR_LATCH) & 0xff; |
159 | } | |
6175556f | 160 | omap_writew(0x00, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC); |
ad4e09b1 KS |
161 | udelay(2); |
162 | } | |
163 | } | |
164 | ||
ad4e09b1 KS |
165 | static void omap_kp_tasklet(unsigned long data) |
166 | { | |
167 | struct omap_kp *omap_kp_data = (struct omap_kp *) data; | |
da1f026b JK |
168 | unsigned short *keycodes = omap_kp_data->input->keycode; |
169 | unsigned int row_shift = get_count_order(omap_kp_data->cols); | |
ad4e09b1 KS |
170 | unsigned char new_state[8], changed, key_down = 0; |
171 | int col, row; | |
172 | int spurious = 0; | |
173 | ||
174 | /* check for any changes */ | |
175 | omap_kp_scan_keypad(omap_kp_data, new_state); | |
176 | ||
177 | /* check for changes and print those */ | |
178 | for (col = 0; col < omap_kp_data->cols; col++) { | |
179 | changed = new_state[col] ^ keypad_state[col]; | |
180 | key_down |= new_state[col]; | |
181 | if (changed == 0) | |
182 | continue; | |
183 | ||
184 | for (row = 0; row < omap_kp_data->rows; row++) { | |
185 | int key; | |
186 | if (!(changed & (1 << row))) | |
187 | continue; | |
188 | #ifdef NEW_BOARD_LEARNING_MODE | |
189 | printk(KERN_INFO "omap-keypad: key %d-%d %s\n", col, | |
190 | row, (new_state[col] & (1 << row)) ? | |
191 | "pressed" : "released"); | |
192 | #else | |
da1f026b | 193 | key = keycodes[MATRIX_SCAN_CODE(row, col, row_shift)]; |
ad4e09b1 KS |
194 | if (key < 0) { |
195 | printk(KERN_WARNING | |
196 | "omap-keypad: Spurious key event %d-%d\n", | |
197 | col, row); | |
198 | /* We scan again after a couple of seconds */ | |
199 | spurious = 1; | |
200 | continue; | |
201 | } | |
202 | ||
203 | if (!(kp_cur_group == (key & GROUP_MASK) || | |
204 | kp_cur_group == -1)) | |
205 | continue; | |
206 | ||
207 | kp_cur_group = key & GROUP_MASK; | |
208 | input_report_key(omap_kp_data->input, key & ~GROUP_MASK, | |
209 | new_state[col] & (1 << row)); | |
210 | #endif | |
211 | } | |
212 | } | |
b27af563 | 213 | input_sync(omap_kp_data->input); |
ad4e09b1 KS |
214 | memcpy(keypad_state, new_state, sizeof(keypad_state)); |
215 | ||
216 | if (key_down) { | |
217 | int delay = HZ / 20; | |
218 | /* some key is pressed - keep irq disabled and use timer | |
219 | * to poll the keypad */ | |
220 | if (spurious) | |
221 | delay = 2 * HZ; | |
222 | mod_timer(&omap_kp_data->timer, jiffies + delay); | |
223 | } else { | |
224 | /* enable interrupts */ | |
225 | if (cpu_is_omap24xx()) { | |
226 | int i; | |
227 | for (i = 0; i < omap_kp_data->rows; i++) | |
15f74b03 | 228 | enable_irq(gpio_to_irq(row_gpios[i])); |
ad4e09b1 | 229 | } else { |
6175556f | 230 | omap_writew(0, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); |
ad4e09b1 KS |
231 | kp_cur_group = -1; |
232 | } | |
9360353f | 233 | } |
ad4e09b1 KS |
234 | } |
235 | ||
236 | static ssize_t omap_kp_enable_show(struct device *dev, | |
237 | struct device_attribute *attr, char *buf) | |
238 | { | |
239 | return sprintf(buf, "%u\n", kp_enable); | |
240 | } | |
241 | ||
242 | static ssize_t omap_kp_enable_store(struct device *dev, struct device_attribute *attr, | |
243 | const char *buf, size_t count) | |
244 | { | |
245 | int state; | |
246 | ||
247 | if (sscanf(buf, "%u", &state) != 1) | |
248 | return -EINVAL; | |
249 | ||
250 | if ((state != 1) && (state != 0)) | |
251 | return -EINVAL; | |
252 | ||
253 | mutex_lock(&kp_enable_mutex); | |
254 | if (state != kp_enable) { | |
255 | if (state) | |
256 | enable_irq(INT_KEYBOARD); | |
257 | else | |
258 | disable_irq(INT_KEYBOARD); | |
259 | kp_enable = state; | |
260 | } | |
261 | mutex_unlock(&kp_enable_mutex); | |
262 | ||
263 | return strnlen(buf, count); | |
264 | } | |
265 | ||
266 | static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, omap_kp_enable_show, omap_kp_enable_store); | |
267 | ||
268 | #ifdef CONFIG_PM | |
269 | static int omap_kp_suspend(struct platform_device *dev, pm_message_t state) | |
270 | { | |
271 | /* Nothing yet */ | |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
276 | static int omap_kp_resume(struct platform_device *dev) | |
277 | { | |
278 | /* Nothing yet */ | |
279 | ||
280 | return 0; | |
281 | } | |
282 | #else | |
283 | #define omap_kp_suspend NULL | |
284 | #define omap_kp_resume NULL | |
285 | #endif | |
286 | ||
d63dab00 | 287 | static int __devinit omap_kp_probe(struct platform_device *pdev) |
ad4e09b1 KS |
288 | { |
289 | struct omap_kp *omap_kp; | |
290 | struct input_dev *input_dev; | |
291 | struct omap_kp_platform_data *pdata = pdev->dev.platform_data; | |
292 | int i, col_idx, row_idx, irq_idx, ret; | |
da1f026b | 293 | unsigned int row_shift, keycodemax; |
ad4e09b1 | 294 | |
da1f026b JK |
295 | if (!pdata->rows || !pdata->cols || !pdata->keymap_data) { |
296 | printk(KERN_ERR "No rows, cols or keymap_data from pdata\n"); | |
ad4e09b1 KS |
297 | return -EINVAL; |
298 | } | |
299 | ||
da1f026b JK |
300 | row_shift = get_count_order(pdata->cols); |
301 | keycodemax = pdata->rows << row_shift; | |
302 | ||
303 | omap_kp = kzalloc(sizeof(struct omap_kp) + | |
304 | keycodemax * sizeof(unsigned short), GFP_KERNEL); | |
ad4e09b1 KS |
305 | input_dev = input_allocate_device(); |
306 | if (!omap_kp || !input_dev) { | |
307 | kfree(omap_kp); | |
308 | input_free_device(input_dev); | |
309 | return -ENOMEM; | |
310 | } | |
311 | ||
312 | platform_set_drvdata(pdev, omap_kp); | |
313 | ||
314 | omap_kp->input = input_dev; | |
315 | ||
316 | /* Disable the interrupt for the MPUIO keyboard */ | |
317 | if (!cpu_is_omap24xx()) | |
6175556f | 318 | omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); |
ad4e09b1 | 319 | |
ad4e09b1 KS |
320 | if (pdata->delay) |
321 | omap_kp->delay = pdata->delay; | |
322 | ||
323 | if (pdata->row_gpios && pdata->col_gpios) { | |
324 | row_gpios = pdata->row_gpios; | |
325 | col_gpios = pdata->col_gpios; | |
326 | } | |
327 | ||
328 | omap_kp->rows = pdata->rows; | |
329 | omap_kp->cols = pdata->cols; | |
330 | ||
331 | if (cpu_is_omap24xx()) { | |
332 | /* Cols: outputs */ | |
333 | for (col_idx = 0; col_idx < omap_kp->cols; col_idx++) { | |
93a22f8b | 334 | if (gpio_request(col_gpios[col_idx], "omap_kp_col") < 0) { |
ad4e09b1 KS |
335 | printk(KERN_ERR "Failed to request" |
336 | "GPIO%d for keypad\n", | |
337 | col_gpios[col_idx]); | |
338 | goto err1; | |
339 | } | |
93a22f8b | 340 | gpio_direction_output(col_gpios[col_idx], 0); |
ad4e09b1 KS |
341 | } |
342 | /* Rows: inputs */ | |
343 | for (row_idx = 0; row_idx < omap_kp->rows; row_idx++) { | |
93a22f8b | 344 | if (gpio_request(row_gpios[row_idx], "omap_kp_row") < 0) { |
ad4e09b1 KS |
345 | printk(KERN_ERR "Failed to request" |
346 | "GPIO%d for keypad\n", | |
347 | row_gpios[row_idx]); | |
348 | goto err2; | |
349 | } | |
93a22f8b | 350 | gpio_direction_input(row_gpios[row_idx]); |
ad4e09b1 | 351 | } |
da3e4c88 DB |
352 | } else { |
353 | col_idx = 0; | |
354 | row_idx = 0; | |
ad4e09b1 KS |
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 */ | |
ad4e09b1 KS |
368 | input_dev->name = "omap-keypad"; |
369 | input_dev->phys = "omap-keypad/input0"; | |
469ba4df | 370 | input_dev->dev.parent = &pdev->dev; |
ad4e09b1 KS |
371 | |
372 | input_dev->id.bustype = BUS_HOST; | |
373 | input_dev->id.vendor = 0x0001; | |
374 | input_dev->id.product = 0x0001; | |
375 | input_dev->id.version = 0x0100; | |
376 | ||
1932811f DT |
377 | if (pdata->rep) |
378 | __set_bit(EV_REP, input_dev->evbit); | |
379 | ||
380 | ret = matrix_keypad_build_keymap(pdata->keymap_data, NULL, | |
381 | pdata->rows, pdata->cols, | |
382 | omap_kp->keymap, input_dev); | |
383 | if (ret < 0) | |
384 | goto err3; | |
385 | ||
ad4e09b1 KS |
386 | ret = input_register_device(omap_kp->input); |
387 | if (ret < 0) { | |
388 | printk(KERN_ERR "Unable to register omap-keypad input device\n"); | |
389 | goto err3; | |
390 | } | |
391 | ||
392 | if (pdata->dbounce) | |
6175556f | 393 | omap_writew(0xff, OMAP1_MPUIO_BASE + OMAP_MPUIO_GPIO_DEBOUNCING); |
ad4e09b1 KS |
394 | |
395 | /* scan current status and enable interrupt */ | |
396 | omap_kp_scan_keypad(omap_kp, keypad_state); | |
397 | if (!cpu_is_omap24xx()) { | |
398 | omap_kp->irq = platform_get_irq(pdev, 0); | |
399 | if (omap_kp->irq >= 0) { | |
400 | if (request_irq(omap_kp->irq, omap_kp_interrupt, 0, | |
401 | "omap-keypad", omap_kp) < 0) | |
402 | goto err4; | |
403 | } | |
6175556f | 404 | omap_writew(0, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); |
ad4e09b1 KS |
405 | } else { |
406 | for (irq_idx = 0; irq_idx < omap_kp->rows; irq_idx++) { | |
15f74b03 | 407 | if (request_irq(gpio_to_irq(row_gpios[irq_idx]), |
9360353f | 408 | omap_kp_interrupt, |
ad4e09b1 | 409 | IRQF_TRIGGER_FALLING, |
9360353f | 410 | "omap-keypad", omap_kp) < 0) |
ad4e09b1 KS |
411 | goto err5; |
412 | } | |
413 | } | |
414 | return 0; | |
415 | err5: | |
9360353f | 416 | for (i = irq_idx - 1; i >=0; i--) |
60c8ba64 | 417 | free_irq(row_gpios[i], omap_kp); |
ad4e09b1 KS |
418 | err4: |
419 | input_unregister_device(omap_kp->input); | |
420 | input_dev = NULL; | |
421 | err3: | |
422 | device_remove_file(&pdev->dev, &dev_attr_enable); | |
423 | err2: | |
da3e4c88 | 424 | for (i = row_idx - 1; i >=0; i--) |
93a22f8b | 425 | gpio_free(row_gpios[i]); |
ad4e09b1 | 426 | err1: |
da3e4c88 | 427 | for (i = col_idx - 1; i >=0; i--) |
93a22f8b | 428 | gpio_free(col_gpios[i]); |
ad4e09b1 KS |
429 | |
430 | kfree(omap_kp); | |
431 | input_free_device(input_dev); | |
432 | ||
433 | return -EINVAL; | |
434 | } | |
435 | ||
d63dab00 | 436 | static int __devexit omap_kp_remove(struct platform_device *pdev) |
ad4e09b1 KS |
437 | { |
438 | struct omap_kp *omap_kp = platform_get_drvdata(pdev); | |
439 | ||
440 | /* disable keypad interrupt handling */ | |
441 | tasklet_disable(&kp_tasklet); | |
442 | if (cpu_is_omap24xx()) { | |
443 | int i; | |
444 | for (i = 0; i < omap_kp->cols; i++) | |
93a22f8b | 445 | gpio_free(col_gpios[i]); |
ad4e09b1 | 446 | for (i = 0; i < omap_kp->rows; i++) { |
93a22f8b | 447 | gpio_free(row_gpios[i]); |
60c8ba64 | 448 | free_irq(gpio_to_irq(row_gpios[i]), omap_kp); |
ad4e09b1 KS |
449 | } |
450 | } else { | |
6175556f | 451 | omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); |
60c8ba64 | 452 | free_irq(omap_kp->irq, omap_kp); |
ad4e09b1 KS |
453 | } |
454 | ||
455 | del_timer_sync(&omap_kp->timer); | |
456 | tasklet_kill(&kp_tasklet); | |
457 | ||
458 | /* unregister everything */ | |
459 | input_unregister_device(omap_kp->input); | |
460 | ||
461 | kfree(omap_kp); | |
462 | ||
463 | return 0; | |
464 | } | |
465 | ||
466 | static struct platform_driver omap_kp_driver = { | |
467 | .probe = omap_kp_probe, | |
d63dab00 | 468 | .remove = __devexit_p(omap_kp_remove), |
ad4e09b1 KS |
469 | .suspend = omap_kp_suspend, |
470 | .resume = omap_kp_resume, | |
471 | .driver = { | |
472 | .name = "omap-keypad", | |
d7b5247b | 473 | .owner = THIS_MODULE, |
ad4e09b1 KS |
474 | }, |
475 | }; | |
5146c84f | 476 | module_platform_driver(omap_kp_driver); |
ad4e09b1 | 477 | |
96de0e25 | 478 | MODULE_AUTHOR("Timo Teräs"); |
ad4e09b1 KS |
479 | MODULE_DESCRIPTION("OMAP Keypad Driver"); |
480 | MODULE_LICENSE("GPL"); | |
d7b5247b | 481 | MODULE_ALIAS("platform:omap-keypad"); |