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Linux 3.4.102
[linux/fpc-iii.git] / drivers / input / keyboard / tegra-kbc.c
blobfe4ac95ca6c8d340b23ac20909c8407c14637c98
1 /*
2 * Keyboard class input driver for the NVIDIA Tegra SoC internal matrix
3 * keyboard controller
4 *
5 * Copyright (c) 2009-2011, NVIDIA Corporation.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * more details.
16 *
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, write to the Free Software Foundation, Inc.,
19 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
20 */
21
22 #include <linux/kernel.h>
23 #include <linux/module.h>
24 #include <linux/input.h>
25 #include <linux/platform_device.h>
26 #include <linux/delay.h>
27 #include <linux/io.h>
28 #include <linux/interrupt.h>
29 #include <linux/of.h>
30 #include <linux/clk.h>
31 #include <linux/slab.h>
32 #include <mach/clk.h>
33 #include <mach/kbc.h>
34
35 #define KBC_MAX_DEBOUNCE_CNT 0x3ffu
36
37 /* KBC row scan time and delay for beginning the row scan. */
38 #define KBC_ROW_SCAN_TIME 16
39 #define KBC_ROW_SCAN_DLY 5
40
41 /* KBC uses a 32KHz clock so a cycle = 1/32Khz */
42 #define KBC_CYCLE_MS 32
43
44 /* KBC Registers */
45
46 /* KBC Control Register */
47 #define KBC_CONTROL_0 0x0
48 #define KBC_FIFO_TH_CNT_SHIFT(cnt) (cnt << 14)
49 #define KBC_DEBOUNCE_CNT_SHIFT(cnt) (cnt << 4)
50 #define KBC_CONTROL_FIFO_CNT_INT_EN (1 << 3)
51 #define KBC_CONTROL_KEYPRESS_INT_EN (1 << 1)
52 #define KBC_CONTROL_KBC_EN (1 << 0)
53
54 /* KBC Interrupt Register */
55 #define KBC_INT_0 0x4
56 #define KBC_INT_FIFO_CNT_INT_STATUS (1 << 2)
57 #define KBC_INT_KEYPRESS_INT_STATUS (1 << 0)
58
59 #define KBC_ROW_CFG0_0 0x8
60 #define KBC_COL_CFG0_0 0x18
61 #define KBC_TO_CNT_0 0x24
62 #define KBC_INIT_DLY_0 0x28
63 #define KBC_RPT_DLY_0 0x2c
64 #define KBC_KP_ENT0_0 0x30
65 #define KBC_KP_ENT1_0 0x34
66 #define KBC_ROW0_MASK_0 0x38
67
68 #define KBC_ROW_SHIFT 3
69
70 struct tegra_kbc {
71 void __iomem *mmio;
72 struct input_dev *idev;
73 unsigned int irq;
74 spinlock_t lock;
75 unsigned int repoll_dly;
76 unsigned long cp_dly_jiffies;
77 unsigned int cp_to_wkup_dly;
78 bool use_fn_map;
79 bool use_ghost_filter;
80 bool keypress_caused_wake;
81 const struct tegra_kbc_platform_data *pdata;
82 unsigned short keycode[KBC_MAX_KEY * 2];
83 unsigned short current_keys[KBC_MAX_KPENT];
84 unsigned int num_pressed_keys;
85 u32 wakeup_key;
86 struct timer_list timer;
87 struct clk *clk;
88 };
89
90 static const u32 tegra_kbc_default_keymap[] __devinitdata = {
91 KEY(0, 2, KEY_W),
92 KEY(0, 3, KEY_S),
93 KEY(0, 4, KEY_A),
94 KEY(0, 5, KEY_Z),
95 KEY(0, 7, KEY_FN),
96
97 KEY(1, 7, KEY_LEFTMETA),
98
99 KEY(2, 6, KEY_RIGHTALT),
100 KEY(2, 7, KEY_LEFTALT),
101
102 KEY(3, 0, KEY_5),
103 KEY(3, 1, KEY_4),
104 KEY(3, 2, KEY_R),
105 KEY(3, 3, KEY_E),
106 KEY(3, 4, KEY_F),
107 KEY(3, 5, KEY_D),
108 KEY(3, 6, KEY_X),
109
110 KEY(4, 0, KEY_7),
111 KEY(4, 1, KEY_6),
112 KEY(4, 2, KEY_T),
113 KEY(4, 3, KEY_H),
114 KEY(4, 4, KEY_G),
115 KEY(4, 5, KEY_V),
116 KEY(4, 6, KEY_C),
117 KEY(4, 7, KEY_SPACE),
118
119 KEY(5, 0, KEY_9),
120 KEY(5, 1, KEY_8),
121 KEY(5, 2, KEY_U),
122 KEY(5, 3, KEY_Y),
123 KEY(5, 4, KEY_J),
124 KEY(5, 5, KEY_N),
125 KEY(5, 6, KEY_B),
126 KEY(5, 7, KEY_BACKSLASH),
127
128 KEY(6, 0, KEY_MINUS),
129 KEY(6, 1, KEY_0),
130 KEY(6, 2, KEY_O),
131 KEY(6, 3, KEY_I),
132 KEY(6, 4, KEY_L),
133 KEY(6, 5, KEY_K),
134 KEY(6, 6, KEY_COMMA),
135 KEY(6, 7, KEY_M),
136
137 KEY(7, 1, KEY_EQUAL),
138 KEY(7, 2, KEY_RIGHTBRACE),
139 KEY(7, 3, KEY_ENTER),
140 KEY(7, 7, KEY_MENU),
141
142 KEY(8, 4, KEY_RIGHTSHIFT),
143 KEY(8, 5, KEY_LEFTSHIFT),
144
145 KEY(9, 5, KEY_RIGHTCTRL),
146 KEY(9, 7, KEY_LEFTCTRL),
147
148 KEY(11, 0, KEY_LEFTBRACE),
149 KEY(11, 1, KEY_P),
150 KEY(11, 2, KEY_APOSTROPHE),
151 KEY(11, 3, KEY_SEMICOLON),
152 KEY(11, 4, KEY_SLASH),
153 KEY(11, 5, KEY_DOT),
154
155 KEY(12, 0, KEY_F10),
156 KEY(12, 1, KEY_F9),
157 KEY(12, 2, KEY_BACKSPACE),
158 KEY(12, 3, KEY_3),
159 KEY(12, 4, KEY_2),
160 KEY(12, 5, KEY_UP),
161 KEY(12, 6, KEY_PRINT),
162 KEY(12, 7, KEY_PAUSE),
163
164 KEY(13, 0, KEY_INSERT),
165 KEY(13, 1, KEY_DELETE),
166 KEY(13, 3, KEY_PAGEUP),
167 KEY(13, 4, KEY_PAGEDOWN),
168 KEY(13, 5, KEY_RIGHT),
169 KEY(13, 6, KEY_DOWN),
170 KEY(13, 7, KEY_LEFT),
171
172 KEY(14, 0, KEY_F11),
173 KEY(14, 1, KEY_F12),
174 KEY(14, 2, KEY_F8),
175 KEY(14, 3, KEY_Q),
176 KEY(14, 4, KEY_F4),
177 KEY(14, 5, KEY_F3),
178 KEY(14, 6, KEY_1),
179 KEY(14, 7, KEY_F7),
180
181 KEY(15, 0, KEY_ESC),
182 KEY(15, 1, KEY_GRAVE),
183 KEY(15, 2, KEY_F5),
184 KEY(15, 3, KEY_TAB),
185 KEY(15, 4, KEY_F1),
186 KEY(15, 5, KEY_F2),
187 KEY(15, 6, KEY_CAPSLOCK),
188 KEY(15, 7, KEY_F6),
189
190 /* Software Handled Function Keys */
191 KEY(20, 0, KEY_KP7),
192
193 KEY(21, 0, KEY_KP9),
194 KEY(21, 1, KEY_KP8),
195 KEY(21, 2, KEY_KP4),
196 KEY(21, 4, KEY_KP1),
197
198 KEY(22, 1, KEY_KPSLASH),
199 KEY(22, 2, KEY_KP6),
200 KEY(22, 3, KEY_KP5),
201 KEY(22, 4, KEY_KP3),
202 KEY(22, 5, KEY_KP2),
203 KEY(22, 7, KEY_KP0),
204
205 KEY(27, 1, KEY_KPASTERISK),
206 KEY(27, 3, KEY_KPMINUS),
207 KEY(27, 4, KEY_KPPLUS),
208 KEY(27, 5, KEY_KPDOT),
209
210 KEY(28, 5, KEY_VOLUMEUP),
211
212 KEY(29, 3, KEY_HOME),
213 KEY(29, 4, KEY_END),
214 KEY(29, 5, KEY_BRIGHTNESSDOWN),
215 KEY(29, 6, KEY_VOLUMEDOWN),
216 KEY(29, 7, KEY_BRIGHTNESSUP),
217
218 KEY(30, 0, KEY_NUMLOCK),
219 KEY(30, 1, KEY_SCROLLLOCK),
220 KEY(30, 2, KEY_MUTE),
221
222 KEY(31, 4, KEY_HELP),
223 };
224
225 static const
226 struct matrix_keymap_data tegra_kbc_default_keymap_data __devinitdata = {
227 .keymap = tegra_kbc_default_keymap,
228 .keymap_size = ARRAY_SIZE(tegra_kbc_default_keymap),
229 };
230
231 static void tegra_kbc_report_released_keys(struct input_dev *input,
232 unsigned short old_keycodes[],
233 unsigned int old_num_keys,
234 unsigned short new_keycodes[],
235 unsigned int new_num_keys)
236 {
237 unsigned int i, j;
238
239 for (i = 0; i < old_num_keys; i++) {
240 for (j = 0; j < new_num_keys; j++)
241 if (old_keycodes[i] == new_keycodes[j])
242 break;
243
244 if (j == new_num_keys)
245 input_report_key(input, old_keycodes[i], 0);
246 }
247 }
248
249 static void tegra_kbc_report_pressed_keys(struct input_dev *input,
250 unsigned char scancodes[],
251 unsigned short keycodes[],
252 unsigned int num_pressed_keys)
253 {
254 unsigned int i;
255
256 for (i = 0; i < num_pressed_keys; i++) {
257 input_event(input, EV_MSC, MSC_SCAN, scancodes[i]);
258 input_report_key(input, keycodes[i], 1);
259 }
260 }
261
262 static void tegra_kbc_report_keys(struct tegra_kbc *kbc)
263 {
264 unsigned char scancodes[KBC_MAX_KPENT];
265 unsigned short keycodes[KBC_MAX_KPENT];
266 u32 val = 0;
267 unsigned int i;
268 unsigned int num_down = 0;
269 bool fn_keypress = false;
270 bool key_in_same_row = false;
271 bool key_in_same_col = false;
272
273 for (i = 0; i < KBC_MAX_KPENT; i++) {
274 if ((i % 4) == 0)
275 val = readl(kbc->mmio + KBC_KP_ENT0_0 + i);
276
277 if (val & 0x80) {
278 unsigned int col = val & 0x07;
279 unsigned int row = (val >> 3) & 0x0f;
280 unsigned char scancode =
281 MATRIX_SCAN_CODE(row, col, KBC_ROW_SHIFT);
282
283 scancodes[num_down] = scancode;
284 keycodes[num_down] = kbc->keycode[scancode];
285 /* If driver uses Fn map, do not report the Fn key. */
286 if ((keycodes[num_down] == KEY_FN) && kbc->use_fn_map)
287 fn_keypress = true;
288 else
289 num_down++;
290 }
291
292 val >>= 8;
293 }
294
295 /*
296 * Matrix keyboard designs are prone to keyboard ghosting.
297 * Ghosting occurs if there are 3 keys such that -
298 * any 2 of the 3 keys share a row, and any 2 of them share a column.
299 * If so ignore the key presses for this iteration.
300 */
301 if (kbc->use_ghost_filter && num_down >= 3) {
302 for (i = 0; i < num_down; i++) {
303 unsigned int j;
304 u8 curr_col = scancodes[i] & 0x07;
305 u8 curr_row = scancodes[i] >> KBC_ROW_SHIFT;
306
307 /*
308 * Find 2 keys such that one key is in the same row
309 * and the other is in the same column as the i-th key.
310 */
311 for (j = i + 1; j < num_down; j++) {
312 u8 col = scancodes[j] & 0x07;
313 u8 row = scancodes[j] >> KBC_ROW_SHIFT;
314
315 if (col == curr_col)
316 key_in_same_col = true;
317 if (row == curr_row)
318 key_in_same_row = true;
319 }
320 }
321 }
322
323 /*
324 * If the platform uses Fn keymaps, translate keys on a Fn keypress.
325 * Function keycodes are KBC_MAX_KEY apart from the plain keycodes.
326 */
327 if (fn_keypress) {
328 for (i = 0; i < num_down; i++) {
329 scancodes[i] += KBC_MAX_KEY;
330 keycodes[i] = kbc->keycode[scancodes[i]];
331 }
332 }
333
334 /* Ignore the key presses for this iteration? */
335 if (key_in_same_col && key_in_same_row)
336 return;
337
338 tegra_kbc_report_released_keys(kbc->idev,
339 kbc->current_keys, kbc->num_pressed_keys,
340 keycodes, num_down);
341 tegra_kbc_report_pressed_keys(kbc->idev, scancodes, keycodes, num_down);
342 input_sync(kbc->idev);
343
344 memcpy(kbc->current_keys, keycodes, sizeof(kbc->current_keys));
345 kbc->num_pressed_keys = num_down;
346 }
347
348 static void tegra_kbc_set_fifo_interrupt(struct tegra_kbc *kbc, bool enable)
349 {
350 u32 val;
351
352 val = readl(kbc->mmio + KBC_CONTROL_0);
353 if (enable)
354 val |= KBC_CONTROL_FIFO_CNT_INT_EN;
355 else
356 val &= ~KBC_CONTROL_FIFO_CNT_INT_EN;
357 writel(val, kbc->mmio + KBC_CONTROL_0);
358 }
359
360 static void tegra_kbc_set_keypress_interrupt(struct tegra_kbc *kbc, bool enable)
361 {
362 u32 val;
363
364 val = readl(kbc->mmio + KBC_CONTROL_0);
365 if (enable)
366 val |= KBC_CONTROL_KEYPRESS_INT_EN;
367 else
368 val &= ~KBC_CONTROL_KEYPRESS_INT_EN;
369 writel(val, kbc->mmio + KBC_CONTROL_0);
370 }
371
372 static void tegra_kbc_keypress_timer(unsigned long data)
373 {
374 struct tegra_kbc *kbc = (struct tegra_kbc *)data;
375 unsigned long flags;
376 u32 val;
377 unsigned int i;
378
379 spin_lock_irqsave(&kbc->lock, flags);
380
381 val = (readl(kbc->mmio + KBC_INT_0) >> 4) & 0xf;
382 if (val) {
383 unsigned long dly;
384
385 tegra_kbc_report_keys(kbc);
386
387 /*
388 * If more than one keys are pressed we need not wait
389 * for the repoll delay.
390 */
391 dly = (val == 1) ? kbc->repoll_dly : 1;
392 mod_timer(&kbc->timer, jiffies + msecs_to_jiffies(dly));
393 } else {
394 /* Release any pressed keys and exit the polling loop */
395 for (i = 0; i < kbc->num_pressed_keys; i++)
396 input_report_key(kbc->idev, kbc->current_keys[i], 0);
397 input_sync(kbc->idev);
398
399 kbc->num_pressed_keys = 0;
400
401 /* All keys are released so enable the keypress interrupt */
402 tegra_kbc_set_fifo_interrupt(kbc, true);
403 }
404
405 spin_unlock_irqrestore(&kbc->lock, flags);
406 }
407
408 static irqreturn_t tegra_kbc_isr(int irq, void *args)
409 {
410 struct tegra_kbc *kbc = args;
411 unsigned long flags;
412 u32 val;
413
414 spin_lock_irqsave(&kbc->lock, flags);
415
416 /*
417 * Quickly bail out & reenable interrupts if the fifo threshold
418 * count interrupt wasn't the interrupt source
419 */
420 val = readl(kbc->mmio + KBC_INT_0);
421 writel(val, kbc->mmio + KBC_INT_0);
422
423 if (val & KBC_INT_FIFO_CNT_INT_STATUS) {
424 /*
425 * Until all keys are released, defer further processing to
426 * the polling loop in tegra_kbc_keypress_timer.
427 */
428 tegra_kbc_set_fifo_interrupt(kbc, false);
429 mod_timer(&kbc->timer, jiffies + kbc->cp_dly_jiffies);
430 } else if (val & KBC_INT_KEYPRESS_INT_STATUS) {
431 /* We can be here only through system resume path */
432 kbc->keypress_caused_wake = true;
433 }
434
435 spin_unlock_irqrestore(&kbc->lock, flags);
436
437 return IRQ_HANDLED;
438 }
439
440 static void tegra_kbc_setup_wakekeys(struct tegra_kbc *kbc, bool filter)
441 {
442 const struct tegra_kbc_platform_data *pdata = kbc->pdata;
443 int i;
444 unsigned int rst_val;
445
446 /* Either mask all keys or none. */
447 rst_val = (filter && !pdata->wakeup) ? ~0 : 0;
448
449 for (i = 0; i < KBC_MAX_ROW; i++)
450 writel(rst_val, kbc->mmio + KBC_ROW0_MASK_0 + i * 4);
451 }
452
453 static void tegra_kbc_config_pins(struct tegra_kbc *kbc)
454 {
455 const struct tegra_kbc_platform_data *pdata = kbc->pdata;
456 int i;
457
458 for (i = 0; i < KBC_MAX_GPIO; i++) {
459 u32 r_shft = 5 * (i % 6);
460 u32 c_shft = 4 * (i % 8);
461 u32 r_mask = 0x1f << r_shft;
462 u32 c_mask = 0x0f << c_shft;
463 u32 r_offs = (i / 6) * 4 + KBC_ROW_CFG0_0;
464 u32 c_offs = (i / 8) * 4 + KBC_COL_CFG0_0;
465 u32 row_cfg = readl(kbc->mmio + r_offs);
466 u32 col_cfg = readl(kbc->mmio + c_offs);
467
468 row_cfg &= ~r_mask;
469 col_cfg &= ~c_mask;
470
471 switch (pdata->pin_cfg[i].type) {
472 case PIN_CFG_ROW:
473 row_cfg |= ((pdata->pin_cfg[i].num << 1) | 1) << r_shft;
474 break;
475
476 case PIN_CFG_COL:
477 col_cfg |= ((pdata->pin_cfg[i].num << 1) | 1) << c_shft;
478 break;
479
480 case PIN_CFG_IGNORE:
481 break;
482 }
483
484 writel(row_cfg, kbc->mmio + r_offs);
485 writel(col_cfg, kbc->mmio + c_offs);
486 }
487 }
488
489 static int tegra_kbc_start(struct tegra_kbc *kbc)
490 {
491 const struct tegra_kbc_platform_data *pdata = kbc->pdata;
492 unsigned int debounce_cnt;
493 u32 val = 0;
494
495 clk_enable(kbc->clk);
496
497 /* Reset the KBC controller to clear all previous status.*/
498 tegra_periph_reset_assert(kbc->clk);
499 udelay(100);
500 tegra_periph_reset_deassert(kbc->clk);
501 udelay(100);
502
503 tegra_kbc_config_pins(kbc);
504 tegra_kbc_setup_wakekeys(kbc, false);
505
506 writel(pdata->repeat_cnt, kbc->mmio + KBC_RPT_DLY_0);
507
508 /* Keyboard debounce count is maximum of 12 bits. */
509 debounce_cnt = min(pdata->debounce_cnt, KBC_MAX_DEBOUNCE_CNT);
510 val = KBC_DEBOUNCE_CNT_SHIFT(debounce_cnt);
511 val |= KBC_FIFO_TH_CNT_SHIFT(1); /* set fifo interrupt threshold to 1 */
512 val |= KBC_CONTROL_FIFO_CNT_INT_EN; /* interrupt on FIFO threshold */
513 val |= KBC_CONTROL_KBC_EN; /* enable */
514 writel(val, kbc->mmio + KBC_CONTROL_0);
515
516 /*
517 * Compute the delay(ns) from interrupt mode to continuous polling
518 * mode so the timer routine is scheduled appropriately.
519 */
520 val = readl(kbc->mmio + KBC_INIT_DLY_0);
521 kbc->cp_dly_jiffies = usecs_to_jiffies((val & 0xfffff) * 32);
522
523 kbc->num_pressed_keys = 0;
524
525 /*
526 * Atomically clear out any remaining entries in the key FIFO
527 * and enable keyboard interrupts.
528 */
529 while (1) {
530 val = readl(kbc->mmio + KBC_INT_0);
531 val >>= 4;
532 if (!val)
533 break;
534
535 val = readl(kbc->mmio + KBC_KP_ENT0_0);
536 val = readl(kbc->mmio + KBC_KP_ENT1_0);
537 }
538 writel(0x7, kbc->mmio + KBC_INT_0);
539
540 enable_irq(kbc->irq);
541
542 return 0;
543 }
544
545 static void tegra_kbc_stop(struct tegra_kbc *kbc)
546 {
547 unsigned long flags;
548 u32 val;
549
550 spin_lock_irqsave(&kbc->lock, flags);
551 val = readl(kbc->mmio + KBC_CONTROL_0);
552 val &= ~1;
553 writel(val, kbc->mmio + KBC_CONTROL_0);
554 spin_unlock_irqrestore(&kbc->lock, flags);
555
556 disable_irq(kbc->irq);
557 del_timer_sync(&kbc->timer);
558
559 clk_disable(kbc->clk);
560 }
561
562 static int tegra_kbc_open(struct input_dev *dev)
563 {
564 struct tegra_kbc *kbc = input_get_drvdata(dev);
565
566 return tegra_kbc_start(kbc);
567 }
568
569 static void tegra_kbc_close(struct input_dev *dev)
570 {
571 struct tegra_kbc *kbc = input_get_drvdata(dev);
572
573 return tegra_kbc_stop(kbc);
574 }
575
576 static bool __devinit
577 tegra_kbc_check_pin_cfg(const struct tegra_kbc_platform_data *pdata,
578 struct device *dev, unsigned int *num_rows)
579 {
580 int i;
581
582 *num_rows = 0;
583
584 for (i = 0; i < KBC_MAX_GPIO; i++) {
585 const struct tegra_kbc_pin_cfg *pin_cfg = &pdata->pin_cfg[i];
586
587 switch (pin_cfg->type) {
588 case PIN_CFG_ROW:
589 if (pin_cfg->num >= KBC_MAX_ROW) {
590 dev_err(dev,
591 "pin_cfg[%d]: invalid row number %d\n",
592 i, pin_cfg->num);
593 return false;
594 }
595 (*num_rows)++;
596 break;
597
598 case PIN_CFG_COL:
599 if (pin_cfg->num >= KBC_MAX_COL) {
600 dev_err(dev,
601 "pin_cfg[%d]: invalid column number %d\n",
602 i, pin_cfg->num);
603 return false;
604 }
605 break;
606
607 case PIN_CFG_IGNORE:
608 break;
609
610 default:
611 dev_err(dev,
612 "pin_cfg[%d]: invalid entry type %d\n",
613 pin_cfg->type, pin_cfg->num);
614 return false;
615 }
616 }
617
618 return true;
619 }
620
621 #ifdef CONFIG_OF
622 static struct tegra_kbc_platform_data * __devinit
623 tegra_kbc_dt_parse_pdata(struct platform_device *pdev)
624 {
625 struct tegra_kbc_platform_data *pdata;
626 struct device_node *np = pdev->dev.of_node;
627 u32 prop;
628 int i;
629
630 if (!np)
631 return NULL;
632
633 pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
634 if (!pdata)
635 return NULL;
636
637 if (!of_property_read_u32(np, "nvidia,debounce-delay-ms", &prop))
638 pdata->debounce_cnt = prop;
639
640 if (!of_property_read_u32(np, "nvidia,repeat-delay-ms", &prop))
641 pdata->repeat_cnt = prop;
642
643 if (of_find_property(np, "nvidia,needs-ghost-filter", NULL))
644 pdata->use_ghost_filter = true;
645
646 if (of_find_property(np, "nvidia,wakeup-source", NULL))
647 pdata->wakeup = true;
648
649 /*
650 * All currently known keymaps with device tree support use the same
651 * pin_cfg, so set it up here.
652 */
653 for (i = 0; i < KBC_MAX_ROW; i++) {
654 pdata->pin_cfg[i].num = i;
655 pdata->pin_cfg[i].type = PIN_CFG_ROW;
656 }
657
658 for (i = 0; i < KBC_MAX_COL; i++) {
659 pdata->pin_cfg[KBC_MAX_ROW + i].num = i;
660 pdata->pin_cfg[KBC_MAX_ROW + i].type = PIN_CFG_COL;
661 }
662
663 pdata->keymap_data = matrix_keyboard_of_fill_keymap(np, "linux,keymap");
664
665 /* FIXME: Add handling of linux,fn-keymap here */
666
667 return pdata;
668 }
669 #else
670 static inline struct tegra_kbc_platform_data *tegra_kbc_dt_parse_pdata(
671 struct platform_device *pdev)
672 {
673 return NULL;
674 }
675 #endif
676
677 static int __devinit tegra_kbc_probe(struct platform_device *pdev)
678 {
679 const struct tegra_kbc_platform_data *pdata = pdev->dev.platform_data;
680 const struct matrix_keymap_data *keymap_data;
681 struct tegra_kbc *kbc;
682 struct input_dev *input_dev;
683 struct resource *res;
684 int irq;
685 int err;
686 int num_rows = 0;
687 unsigned int debounce_cnt;
688 unsigned int scan_time_rows;
689
690 if (!pdata)
691 pdata = tegra_kbc_dt_parse_pdata(pdev);
692
693 if (!pdata)
694 return -EINVAL;
695
696 if (!tegra_kbc_check_pin_cfg(pdata, &pdev->dev, &num_rows)) {
697 err = -EINVAL;
698 goto err_free_pdata;
699 }
700
701 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
702 if (!res) {
703 dev_err(&pdev->dev, "failed to get I/O memory\n");
704 err = -ENXIO;
705 goto err_free_pdata;
706 }
707
708 irq = platform_get_irq(pdev, 0);
709 if (irq < 0) {
710 dev_err(&pdev->dev, "failed to get keyboard IRQ\n");
711 err = -ENXIO;
712 goto err_free_pdata;
713 }
714
715 kbc = kzalloc(sizeof(*kbc), GFP_KERNEL);
716 input_dev = input_allocate_device();
717 if (!kbc || !input_dev) {
718 err = -ENOMEM;
719 goto err_free_mem;
720 }
721
722 kbc->pdata = pdata;
723 kbc->idev = input_dev;
724 kbc->irq = irq;
725 spin_lock_init(&kbc->lock);
726 setup_timer(&kbc->timer, tegra_kbc_keypress_timer, (unsigned long)kbc);
727
728 res = request_mem_region(res->start, resource_size(res), pdev->name);
729 if (!res) {
730 dev_err(&pdev->dev, "failed to request I/O memory\n");
731 err = -EBUSY;
732 goto err_free_mem;
733 }
734
735 kbc->mmio = ioremap(res->start, resource_size(res));
736 if (!kbc->mmio) {
737 dev_err(&pdev->dev, "failed to remap I/O memory\n");
738 err = -ENXIO;
739 goto err_free_mem_region;
740 }
741
742 kbc->clk = clk_get(&pdev->dev, NULL);
743 if (IS_ERR(kbc->clk)) {
744 dev_err(&pdev->dev, "failed to get keyboard clock\n");
745 err = PTR_ERR(kbc->clk);
746 goto err_iounmap;
747 }
748
749 /*
750 * The time delay between two consecutive reads of the FIFO is
751 * the sum of the repeat time and the time taken for scanning
752 * the rows. There is an additional delay before the row scanning
753 * starts. The repoll delay is computed in milliseconds.
754 */
755 debounce_cnt = min(pdata->debounce_cnt, KBC_MAX_DEBOUNCE_CNT);
756 scan_time_rows = (KBC_ROW_SCAN_TIME + debounce_cnt) * num_rows;
757 kbc->repoll_dly = KBC_ROW_SCAN_DLY + scan_time_rows + pdata->repeat_cnt;
758 kbc->repoll_dly = DIV_ROUND_UP(kbc->repoll_dly, KBC_CYCLE_MS);
759
760 input_dev->name = pdev->name;
761 input_dev->id.bustype = BUS_HOST;
762 input_dev->dev.parent = &pdev->dev;
763 input_dev->open = tegra_kbc_open;
764 input_dev->close = tegra_kbc_close;
765
766 input_set_drvdata(input_dev, kbc);
767
768 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
769 input_set_capability(input_dev, EV_MSC, MSC_SCAN);
770
771 input_dev->keycode = kbc->keycode;
772 input_dev->keycodesize = sizeof(kbc->keycode[0]);
773 input_dev->keycodemax = KBC_MAX_KEY;
774 if (pdata->use_fn_map)
775 input_dev->keycodemax *= 2;
776
777 kbc->use_fn_map = pdata->use_fn_map;
778 kbc->use_ghost_filter = pdata->use_ghost_filter;
779 keymap_data = pdata->keymap_data ?: &tegra_kbc_default_keymap_data;
780 matrix_keypad_build_keymap(keymap_data, KBC_ROW_SHIFT,
781 input_dev->keycode, input_dev->keybit);
782 kbc->wakeup_key = pdata->wakeup_key;
783
784 err = request_irq(kbc->irq, tegra_kbc_isr,
785 IRQF_NO_SUSPEND | IRQF_TRIGGER_HIGH, pdev->name, kbc);
786 if (err) {
787 dev_err(&pdev->dev, "failed to request keyboard IRQ\n");
788 goto err_put_clk;
789 }
790
791 disable_irq(kbc->irq);
792
793 err = input_register_device(kbc->idev);
794 if (err) {
795 dev_err(&pdev->dev, "failed to register input device\n");
796 goto err_free_irq;
797 }
798
799 platform_set_drvdata(pdev, kbc);
800 device_init_wakeup(&pdev->dev, pdata->wakeup);
801
802 if (!pdev->dev.platform_data)
803 matrix_keyboard_of_free_keymap(pdata->keymap_data);
804
805 return 0;
806
807 err_free_irq:
808 free_irq(kbc->irq, pdev);
809 err_put_clk:
810 clk_put(kbc->clk);
811 err_iounmap:
812 iounmap(kbc->mmio);
813 err_free_mem_region:
814 release_mem_region(res->start, resource_size(res));
815 err_free_mem:
816 input_free_device(input_dev);
817 kfree(kbc);
818 err_free_pdata:
819 if (!pdev->dev.platform_data) {
820 matrix_keyboard_of_free_keymap(pdata->keymap_data);
821 kfree(pdata);
822 }
823
824 return err;
825 }
826
827 static int __devexit tegra_kbc_remove(struct platform_device *pdev)
828 {
829 struct tegra_kbc *kbc = platform_get_drvdata(pdev);
830 struct resource *res;
831
832 platform_set_drvdata(pdev, NULL);
833
834 free_irq(kbc->irq, pdev);
835 clk_put(kbc->clk);
836
837 input_unregister_device(kbc->idev);
838 iounmap(kbc->mmio);
839 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
840 release_mem_region(res->start, resource_size(res));
841
842 /*
843 * If we do not have platform data attached to the device we
844 * allocated it ourselves and thus need to free it.
845 */
846 if (!pdev->dev.platform_data)
847 kfree(kbc->pdata);
848
849 kfree(kbc);
850
851 return 0;
852 }
853
854 #ifdef CONFIG_PM_SLEEP
855 static int tegra_kbc_suspend(struct device *dev)
856 {
857 struct platform_device *pdev = to_platform_device(dev);
858 struct tegra_kbc *kbc = platform_get_drvdata(pdev);
859
860 mutex_lock(&kbc->idev->mutex);
861 if (device_may_wakeup(&pdev->dev)) {
862 disable_irq(kbc->irq);
863 del_timer_sync(&kbc->timer);
864 tegra_kbc_set_fifo_interrupt(kbc, false);
865
866 /* Forcefully clear the interrupt status */
867 writel(0x7, kbc->mmio + KBC_INT_0);
868 /*
869 * Store the previous resident time of continuous polling mode.
870 * Force the keyboard into interrupt mode.
871 */
872 kbc->cp_to_wkup_dly = readl(kbc->mmio + KBC_TO_CNT_0);
873 writel(0, kbc->mmio + KBC_TO_CNT_0);
874
875 tegra_kbc_setup_wakekeys(kbc, true);
876 msleep(30);
877
878 kbc->keypress_caused_wake = false;
879 /* Enable keypress interrupt before going into suspend. */
880 tegra_kbc_set_keypress_interrupt(kbc, true);
881 enable_irq(kbc->irq);
882 enable_irq_wake(kbc->irq);
883 } else {
884 if (kbc->idev->users)
885 tegra_kbc_stop(kbc);
886 }
887 mutex_unlock(&kbc->idev->mutex);
888
889 return 0;
890 }
891
892 static int tegra_kbc_resume(struct device *dev)
893 {
894 struct platform_device *pdev = to_platform_device(dev);
895 struct tegra_kbc *kbc = platform_get_drvdata(pdev);
896 int err = 0;
897
898 mutex_lock(&kbc->idev->mutex);
899 if (device_may_wakeup(&pdev->dev)) {
900 disable_irq_wake(kbc->irq);
901 tegra_kbc_setup_wakekeys(kbc, false);
902 /* We will use fifo interrupts for key detection. */
903 tegra_kbc_set_keypress_interrupt(kbc, false);
904
905 /* Restore the resident time of continuous polling mode. */
906 writel(kbc->cp_to_wkup_dly, kbc->mmio + KBC_TO_CNT_0);
907
908 tegra_kbc_set_fifo_interrupt(kbc, true);
909
910 if (kbc->keypress_caused_wake && kbc->wakeup_key) {
911 /*
912 * We can't report events directly from the ISR
913 * because timekeeping is stopped when processing
914 * wakeup request and we get a nasty warning when
915 * we try to call do_gettimeofday() in evdev
916 * handler.
917 */
918 input_report_key(kbc->idev, kbc->wakeup_key, 1);
919 input_sync(kbc->idev);
920 input_report_key(kbc->idev, kbc->wakeup_key, 0);
921 input_sync(kbc->idev);
922 }
923 } else {
924 if (kbc->idev->users)
925 err = tegra_kbc_start(kbc);
926 }
927 mutex_unlock(&kbc->idev->mutex);
928
929 return err;
930 }
931 #endif
932
933 static SIMPLE_DEV_PM_OPS(tegra_kbc_pm_ops, tegra_kbc_suspend, tegra_kbc_resume);
934
935 static const struct of_device_id tegra_kbc_of_match[] = {
936 { .compatible = "nvidia,tegra20-kbc", },
937 { },
938 };
939 MODULE_DEVICE_TABLE(of, tegra_kbc_of_match);
940
941 static struct platform_driver tegra_kbc_driver = {
942 .probe = tegra_kbc_probe,
943 .remove = __devexit_p(tegra_kbc_remove),
944 .driver = {
945 .name = "tegra-kbc",
946 .owner = THIS_MODULE,
947 .pm = &tegra_kbc_pm_ops,
948 .of_match_table = tegra_kbc_of_match,
949 },
950 };
951 module_platform_driver(tegra_kbc_driver);
952
953 MODULE_LICENSE("GPL");
954 MODULE_AUTHOR("Rakesh Iyer <riyer@nvidia.com>");
955 MODULE_DESCRIPTION("Tegra matrix keyboard controller driver");
956 MODULE_ALIAS("platform:tegra-kbc");
Linux with added FPC-III support