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/of_device.h>
31 #include <linux/clk.h>
32 #include <linux/slab.h>
33 #include <linux/input/matrix_keypad.h>
34 #include <linux/reset.h>
35 #include <linux/err.h>
36
37 #define KBC_MAX_KPENT 8
38
39 /* Maximum row/column supported by Tegra KBC yet is 16x8 */
40 #define KBC_MAX_GPIO 24
41 /* Maximum keys supported by Tegra KBC yet is 16 x 8*/
42 #define KBC_MAX_KEY (16 * 8)
43
44 #define KBC_MAX_DEBOUNCE_CNT 0x3ffu
45
46 /* KBC row scan time and delay for beginning the row scan. */
47 #define KBC_ROW_SCAN_TIME 16
48 #define KBC_ROW_SCAN_DLY 5
49
50 /* KBC uses a 32KHz clock so a cycle = 1/32Khz */
51 #define KBC_CYCLE_MS 32
52
53 /* KBC Registers */
54
55 /* KBC Control Register */
56 #define KBC_CONTROL_0 0x0
57 #define KBC_FIFO_TH_CNT_SHIFT(cnt) (cnt << 14)
58 #define KBC_DEBOUNCE_CNT_SHIFT(cnt) (cnt << 4)
59 #define KBC_CONTROL_FIFO_CNT_INT_EN (1 << 3)
60 #define KBC_CONTROL_KEYPRESS_INT_EN (1 << 1)
61 #define KBC_CONTROL_KBC_EN (1 << 0)
62
63 /* KBC Interrupt Register */
64 #define KBC_INT_0 0x4
65 #define KBC_INT_FIFO_CNT_INT_STATUS (1 << 2)
66 #define KBC_INT_KEYPRESS_INT_STATUS (1 << 0)
67
68 #define KBC_ROW_CFG0_0 0x8
69 #define KBC_COL_CFG0_0 0x18
70 #define KBC_TO_CNT_0 0x24
71 #define KBC_INIT_DLY_0 0x28
72 #define KBC_RPT_DLY_0 0x2c
73 #define KBC_KP_ENT0_0 0x30
74 #define KBC_KP_ENT1_0 0x34
75 #define KBC_ROW0_MASK_0 0x38
76
77 #define KBC_ROW_SHIFT 3
78
79 enum tegra_pin_type {
80 PIN_CFG_IGNORE,
81 PIN_CFG_COL,
82 PIN_CFG_ROW,
83 };
84
85 /* Tegra KBC hw support */
86 struct tegra_kbc_hw_support {
87 int max_rows;
88 int max_columns;
89 };
90
91 struct tegra_kbc_pin_cfg {
92 enum tegra_pin_type type;
93 unsigned char num;
94 };
95
96 struct tegra_kbc {
97 struct device *dev;
98 unsigned int debounce_cnt;
99 unsigned int repeat_cnt;
100 struct tegra_kbc_pin_cfg pin_cfg[KBC_MAX_GPIO];
101 const struct matrix_keymap_data *keymap_data;
102 bool wakeup;
103 void __iomem *mmio;
104 struct input_dev *idev;
105 int irq;
106 spinlock_t lock;
107 unsigned int repoll_dly;
108 unsigned long cp_dly_jiffies;
109 unsigned int cp_to_wkup_dly;
110 bool use_fn_map;
111 bool use_ghost_filter;
112 bool keypress_caused_wake;
113 unsigned short keycode[KBC_MAX_KEY * 2];
114 unsigned short current_keys[KBC_MAX_KPENT];
115 unsigned int num_pressed_keys;
116 u32 wakeup_key;
117 struct timer_list timer;
118 struct clk *clk;
119 struct reset_control *rst;
120 const struct tegra_kbc_hw_support *hw_support;
121 int max_keys;
122 int num_rows_and_columns;
123 };
124
tegra_kbc_report_released_keys(struct input_dev * input,unsigned short old_keycodes[],unsigned int old_num_keys,unsigned short new_keycodes[],unsigned int new_num_keys)125 static void tegra_kbc_report_released_keys(struct input_dev *input,
126 unsigned short old_keycodes[],
127 unsigned int old_num_keys,
128 unsigned short new_keycodes[],
129 unsigned int new_num_keys)
130 {
131 unsigned int i, j;
132
133 for (i = 0; i < old_num_keys; i++) {
134 for (j = 0; j < new_num_keys; j++)
135 if (old_keycodes[i] == new_keycodes[j])
136 break;
137
138 if (j == new_num_keys)
139 input_report_key(input, old_keycodes[i], 0);
140 }
141 }
142
tegra_kbc_report_pressed_keys(struct input_dev * input,unsigned char scancodes[],unsigned short keycodes[],unsigned int num_pressed_keys)143 static void tegra_kbc_report_pressed_keys(struct input_dev *input,
144 unsigned char scancodes[],
145 unsigned short keycodes[],
146 unsigned int num_pressed_keys)
147 {
148 unsigned int i;
149
150 for (i = 0; i < num_pressed_keys; i++) {
151 input_event(input, EV_MSC, MSC_SCAN, scancodes[i]);
152 input_report_key(input, keycodes[i], 1);
153 }
154 }
155
tegra_kbc_report_keys(struct tegra_kbc * kbc)156 static void tegra_kbc_report_keys(struct tegra_kbc *kbc)
157 {
158 unsigned char scancodes[KBC_MAX_KPENT];
159 unsigned short keycodes[KBC_MAX_KPENT];
160 u32 val = 0;
161 unsigned int i;
162 unsigned int num_down = 0;
163 bool fn_keypress = false;
164 bool key_in_same_row = false;
165 bool key_in_same_col = false;
166
167 for (i = 0; i < KBC_MAX_KPENT; i++) {
168 if ((i % 4) == 0)
169 val = readl(kbc->mmio + KBC_KP_ENT0_0 + i);
170
171 if (val & 0x80) {
172 unsigned int col = val & 0x07;
173 unsigned int row = (val >> 3) & 0x0f;
174 unsigned char scancode =
175 MATRIX_SCAN_CODE(row, col, KBC_ROW_SHIFT);
176
177 scancodes[num_down] = scancode;
178 keycodes[num_down] = kbc->keycode[scancode];
179 /* If driver uses Fn map, do not report the Fn key. */
180 if ((keycodes[num_down] == KEY_FN) && kbc->use_fn_map)
181 fn_keypress = true;
182 else
183 num_down++;
184 }
185
186 val >>= 8;
187 }
188
189 /*
190 * Matrix keyboard designs are prone to keyboard ghosting.
191 * Ghosting occurs if there are 3 keys such that -
192 * any 2 of the 3 keys share a row, and any 2 of them share a column.
193 * If so ignore the key presses for this iteration.
194 */
195 if (kbc->use_ghost_filter && num_down >= 3) {
196 for (i = 0; i < num_down; i++) {
197 unsigned int j;
198 u8 curr_col = scancodes[i] & 0x07;
199 u8 curr_row = scancodes[i] >> KBC_ROW_SHIFT;
200
201 /*
202 * Find 2 keys such that one key is in the same row
203 * and the other is in the same column as the i-th key.
204 */
205 for (j = i + 1; j < num_down; j++) {
206 u8 col = scancodes[j] & 0x07;
207 u8 row = scancodes[j] >> KBC_ROW_SHIFT;
208
209 if (col == curr_col)
210 key_in_same_col = true;
211 if (row == curr_row)
212 key_in_same_row = true;
213 }
214 }
215 }
216
217 /*
218 * If the platform uses Fn keymaps, translate keys on a Fn keypress.
219 * Function keycodes are max_keys apart from the plain keycodes.
220 */
221 if (fn_keypress) {
222 for (i = 0; i < num_down; i++) {
223 scancodes[i] += kbc->max_keys;
224 keycodes[i] = kbc->keycode[scancodes[i]];
225 }
226 }
227
228 /* Ignore the key presses for this iteration? */
229 if (key_in_same_col && key_in_same_row)
230 return;
231
232 tegra_kbc_report_released_keys(kbc->idev,
233 kbc->current_keys, kbc->num_pressed_keys,
234 keycodes, num_down);
235 tegra_kbc_report_pressed_keys(kbc->idev, scancodes, keycodes, num_down);
236 input_sync(kbc->idev);
237
238 memcpy(kbc->current_keys, keycodes, sizeof(kbc->current_keys));
239 kbc->num_pressed_keys = num_down;
240 }
241
tegra_kbc_set_fifo_interrupt(struct tegra_kbc * kbc,bool enable)242 static void tegra_kbc_set_fifo_interrupt(struct tegra_kbc *kbc, bool enable)
243 {
244 u32 val;
245
246 val = readl(kbc->mmio + KBC_CONTROL_0);
247 if (enable)
248 val |= KBC_CONTROL_FIFO_CNT_INT_EN;
249 else
250 val &= ~KBC_CONTROL_FIFO_CNT_INT_EN;
251 writel(val, kbc->mmio + KBC_CONTROL_0);
252 }
253
tegra_kbc_keypress_timer(struct timer_list * t)254 static void tegra_kbc_keypress_timer(struct timer_list *t)
255 {
256 struct tegra_kbc *kbc = from_timer(kbc, t, timer);
257 unsigned long flags;
258 u32 val;
259 unsigned int i;
260
261 spin_lock_irqsave(&kbc->lock, flags);
262
263 val = (readl(kbc->mmio + KBC_INT_0) >> 4) & 0xf;
264 if (val) {
265 unsigned long dly;
266
267 tegra_kbc_report_keys(kbc);
268
269 /*
270 * If more than one keys are pressed we need not wait
271 * for the repoll delay.
272 */
273 dly = (val == 1) ? kbc->repoll_dly : 1;
274 mod_timer(&kbc->timer, jiffies + msecs_to_jiffies(dly));
275 } else {
276 /* Release any pressed keys and exit the polling loop */
277 for (i = 0; i < kbc->num_pressed_keys; i++)
278 input_report_key(kbc->idev, kbc->current_keys[i], 0);
279 input_sync(kbc->idev);
280
281 kbc->num_pressed_keys = 0;
282
283 /* All keys are released so enable the keypress interrupt */
284 tegra_kbc_set_fifo_interrupt(kbc, true);
285 }
286
287 spin_unlock_irqrestore(&kbc->lock, flags);
288 }
289
tegra_kbc_isr(int irq,void * args)290 static irqreturn_t tegra_kbc_isr(int irq, void *args)
291 {
292 struct tegra_kbc *kbc = args;
293 unsigned long flags;
294 u32 val;
295
296 spin_lock_irqsave(&kbc->lock, flags);
297
298 /*
299 * Quickly bail out & reenable interrupts if the fifo threshold
300 * count interrupt wasn't the interrupt source
301 */
302 val = readl(kbc->mmio + KBC_INT_0);
303 writel(val, kbc->mmio + KBC_INT_0);
304
305 if (val & KBC_INT_FIFO_CNT_INT_STATUS) {
306 /*
307 * Until all keys are released, defer further processing to
308 * the polling loop in tegra_kbc_keypress_timer.
309 */
310 tegra_kbc_set_fifo_interrupt(kbc, false);
311 mod_timer(&kbc->timer, jiffies + kbc->cp_dly_jiffies);
312 } else if (val & KBC_INT_KEYPRESS_INT_STATUS) {
313 /* We can be here only through system resume path */
314 kbc->keypress_caused_wake = true;
315 }
316
317 spin_unlock_irqrestore(&kbc->lock, flags);
318
319 return IRQ_HANDLED;
320 }
321
tegra_kbc_setup_wakekeys(struct tegra_kbc * kbc,bool filter)322 static void tegra_kbc_setup_wakekeys(struct tegra_kbc *kbc, bool filter)
323 {
324 int i;
325 unsigned int rst_val;
326
327 /* Either mask all keys or none. */
328 rst_val = (filter && !kbc->wakeup) ? ~0 : 0;
329
330 for (i = 0; i < kbc->hw_support->max_rows; i++)
331 writel(rst_val, kbc->mmio + KBC_ROW0_MASK_0 + i * 4);
332 }
333
tegra_kbc_config_pins(struct tegra_kbc * kbc)334 static void tegra_kbc_config_pins(struct tegra_kbc *kbc)
335 {
336 int i;
337
338 for (i = 0; i < KBC_MAX_GPIO; i++) {
339 u32 r_shft = 5 * (i % 6);
340 u32 c_shft = 4 * (i % 8);
341 u32 r_mask = 0x1f << r_shft;
342 u32 c_mask = 0x0f << c_shft;
343 u32 r_offs = (i / 6) * 4 + KBC_ROW_CFG0_0;
344 u32 c_offs = (i / 8) * 4 + KBC_COL_CFG0_0;
345 u32 row_cfg = readl(kbc->mmio + r_offs);
346 u32 col_cfg = readl(kbc->mmio + c_offs);
347
348 row_cfg &= ~r_mask;
349 col_cfg &= ~c_mask;
350
351 switch (kbc->pin_cfg[i].type) {
352 case PIN_CFG_ROW:
353 row_cfg |= ((kbc->pin_cfg[i].num << 1) | 1) << r_shft;
354 break;
355
356 case PIN_CFG_COL:
357 col_cfg |= ((kbc->pin_cfg[i].num << 1) | 1) << c_shft;
358 break;
359
360 case PIN_CFG_IGNORE:
361 break;
362 }
363
364 writel(row_cfg, kbc->mmio + r_offs);
365 writel(col_cfg, kbc->mmio + c_offs);
366 }
367 }
368
tegra_kbc_start(struct tegra_kbc * kbc)369 static int tegra_kbc_start(struct tegra_kbc *kbc)
370 {
371 unsigned int debounce_cnt;
372 u32 val = 0;
373 int ret;
374
375 ret = clk_prepare_enable(kbc->clk);
376 if (ret)
377 return ret;
378
379 /* Reset the KBC controller to clear all previous status.*/
380 reset_control_assert(kbc->rst);
381 udelay(100);
382 reset_control_deassert(kbc->rst);
383 udelay(100);
384
385 tegra_kbc_config_pins(kbc);
386 tegra_kbc_setup_wakekeys(kbc, false);
387
388 writel(kbc->repeat_cnt, kbc->mmio + KBC_RPT_DLY_0);
389
390 /* Keyboard debounce count is maximum of 12 bits. */
391 debounce_cnt = min(kbc->debounce_cnt, KBC_MAX_DEBOUNCE_CNT);
392 val = KBC_DEBOUNCE_CNT_SHIFT(debounce_cnt);
393 val |= KBC_FIFO_TH_CNT_SHIFT(1); /* set fifo interrupt threshold to 1 */
394 val |= KBC_CONTROL_FIFO_CNT_INT_EN; /* interrupt on FIFO threshold */
395 val |= KBC_CONTROL_KBC_EN; /* enable */
396 writel(val, kbc->mmio + KBC_CONTROL_0);
397
398 /*
399 * Compute the delay(ns) from interrupt mode to continuous polling
400 * mode so the timer routine is scheduled appropriately.
401 */
402 val = readl(kbc->mmio + KBC_INIT_DLY_0);
403 kbc->cp_dly_jiffies = usecs_to_jiffies((val & 0xfffff) * 32);
404
405 kbc->num_pressed_keys = 0;
406
407 /*
408 * Atomically clear out any remaining entries in the key FIFO
409 * and enable keyboard interrupts.
410 */
411 while (1) {
412 val = readl(kbc->mmio + KBC_INT_0);
413 val >>= 4;
414 if (!val)
415 break;
416
417 val = readl(kbc->mmio + KBC_KP_ENT0_0);
418 val = readl(kbc->mmio + KBC_KP_ENT1_0);
419 }
420 writel(0x7, kbc->mmio + KBC_INT_0);
421
422 enable_irq(kbc->irq);
423
424 return 0;
425 }
426
tegra_kbc_stop(struct tegra_kbc * kbc)427 static void tegra_kbc_stop(struct tegra_kbc *kbc)
428 {
429 unsigned long flags;
430 u32 val;
431
432 spin_lock_irqsave(&kbc->lock, flags);
433 val = readl(kbc->mmio + KBC_CONTROL_0);
434 val &= ~1;
435 writel(val, kbc->mmio + KBC_CONTROL_0);
436 spin_unlock_irqrestore(&kbc->lock, flags);
437
438 disable_irq(kbc->irq);
439 del_timer_sync(&kbc->timer);
440
441 clk_disable_unprepare(kbc->clk);
442 }
443
tegra_kbc_open(struct input_dev * dev)444 static int tegra_kbc_open(struct input_dev *dev)
445 {
446 struct tegra_kbc *kbc = input_get_drvdata(dev);
447
448 return tegra_kbc_start(kbc);
449 }
450
tegra_kbc_close(struct input_dev * dev)451 static void tegra_kbc_close(struct input_dev *dev)
452 {
453 struct tegra_kbc *kbc = input_get_drvdata(dev);
454
455 return tegra_kbc_stop(kbc);
456 }
457
tegra_kbc_check_pin_cfg(const struct tegra_kbc * kbc,unsigned int * num_rows)458 static bool tegra_kbc_check_pin_cfg(const struct tegra_kbc *kbc,
459 unsigned int *num_rows)
460 {
461 int i;
462
463 *num_rows = 0;
464
465 for (i = 0; i < KBC_MAX_GPIO; i++) {
466 const struct tegra_kbc_pin_cfg *pin_cfg = &kbc->pin_cfg[i];
467
468 switch (pin_cfg->type) {
469 case PIN_CFG_ROW:
470 if (pin_cfg->num >= kbc->hw_support->max_rows) {
471 dev_err(kbc->dev,
472 "pin_cfg[%d]: invalid row number %d\n",
473 i, pin_cfg->num);
474 return false;
475 }
476 (*num_rows)++;
477 break;
478
479 case PIN_CFG_COL:
480 if (pin_cfg->num >= kbc->hw_support->max_columns) {
481 dev_err(kbc->dev,
482 "pin_cfg[%d]: invalid column number %d\n",
483 i, pin_cfg->num);
484 return false;
485 }
486 break;
487
488 case PIN_CFG_IGNORE:
489 break;
490
491 default:
492 dev_err(kbc->dev,
493 "pin_cfg[%d]: invalid entry type %d\n",
494 pin_cfg->type, pin_cfg->num);
495 return false;
496 }
497 }
498
499 return true;
500 }
501
tegra_kbc_parse_dt(struct tegra_kbc * kbc)502 static int tegra_kbc_parse_dt(struct tegra_kbc *kbc)
503 {
504 struct device_node *np = kbc->dev->of_node;
505 u32 prop;
506 int i;
507 u32 num_rows = 0;
508 u32 num_cols = 0;
509 u32 cols_cfg[KBC_MAX_GPIO];
510 u32 rows_cfg[KBC_MAX_GPIO];
511 int proplen;
512 int ret;
513
514 if (!of_property_read_u32(np, "nvidia,debounce-delay-ms", &prop))
515 kbc->debounce_cnt = prop;
516
517 if (!of_property_read_u32(np, "nvidia,repeat-delay-ms", &prop))
518 kbc->repeat_cnt = prop;
519
520 if (of_find_property(np, "nvidia,needs-ghost-filter", NULL))
521 kbc->use_ghost_filter = true;
522
523 if (of_property_read_bool(np, "wakeup-source") ||
524 of_property_read_bool(np, "nvidia,wakeup-source")) /* legacy */
525 kbc->wakeup = true;
526
527 if (!of_get_property(np, "nvidia,kbc-row-pins", &proplen)) {
528 dev_err(kbc->dev, "property nvidia,kbc-row-pins not found\n");
529 return -ENOENT;
530 }
531 num_rows = proplen / sizeof(u32);
532
533 if (!of_get_property(np, "nvidia,kbc-col-pins", &proplen)) {
534 dev_err(kbc->dev, "property nvidia,kbc-col-pins not found\n");
535 return -ENOENT;
536 }
537 num_cols = proplen / sizeof(u32);
538
539 if (num_rows > kbc->hw_support->max_rows) {
540 dev_err(kbc->dev,
541 "Number of rows is more than supported by hardware\n");
542 return -EINVAL;
543 }
544
545 if (num_cols > kbc->hw_support->max_columns) {
546 dev_err(kbc->dev,
547 "Number of cols is more than supported by hardware\n");
548 return -EINVAL;
549 }
550
551 if (!of_get_property(np, "linux,keymap", &proplen)) {
552 dev_err(kbc->dev, "property linux,keymap not found\n");
553 return -ENOENT;
554 }
555
556 if (!num_rows || !num_cols || ((num_rows + num_cols) > KBC_MAX_GPIO)) {
557 dev_err(kbc->dev,
558 "keypad rows/columns not properly specified\n");
559 return -EINVAL;
560 }
561
562 /* Set all pins as non-configured */
563 for (i = 0; i < kbc->num_rows_and_columns; i++)
564 kbc->pin_cfg[i].type = PIN_CFG_IGNORE;
565
566 ret = of_property_read_u32_array(np, "nvidia,kbc-row-pins",
567 rows_cfg, num_rows);
568 if (ret < 0) {
569 dev_err(kbc->dev, "Rows configurations are not proper\n");
570 return -EINVAL;
571 }
572
573 ret = of_property_read_u32_array(np, "nvidia,kbc-col-pins",
574 cols_cfg, num_cols);
575 if (ret < 0) {
576 dev_err(kbc->dev, "Cols configurations are not proper\n");
577 return -EINVAL;
578 }
579
580 for (i = 0; i < num_rows; i++) {
581 kbc->pin_cfg[rows_cfg[i]].type = PIN_CFG_ROW;
582 kbc->pin_cfg[rows_cfg[i]].num = i;
583 }
584
585 for (i = 0; i < num_cols; i++) {
586 kbc->pin_cfg[cols_cfg[i]].type = PIN_CFG_COL;
587 kbc->pin_cfg[cols_cfg[i]].num = i;
588 }
589
590 return 0;
591 }
592
593 static const struct tegra_kbc_hw_support tegra20_kbc_hw_support = {
594 .max_rows = 16,
595 .max_columns = 8,
596 };
597
598 static const struct tegra_kbc_hw_support tegra11_kbc_hw_support = {
599 .max_rows = 11,
600 .max_columns = 8,
601 };
602
603 static const struct of_device_id tegra_kbc_of_match[] = {
604 { .compatible = "nvidia,tegra114-kbc", .data = &tegra11_kbc_hw_support},
605 { .compatible = "nvidia,tegra30-kbc", .data = &tegra20_kbc_hw_support},
606 { .compatible = "nvidia,tegra20-kbc", .data = &tegra20_kbc_hw_support},
607 { },
608 };
609 MODULE_DEVICE_TABLE(of, tegra_kbc_of_match);
610
tegra_kbc_probe(struct platform_device * pdev)611 static int tegra_kbc_probe(struct platform_device *pdev)
612 {
613 struct tegra_kbc *kbc;
614 struct resource *res;
615 int err;
616 int num_rows = 0;
617 unsigned int debounce_cnt;
618 unsigned int scan_time_rows;
619 unsigned int keymap_rows;
620 const struct of_device_id *match;
621
622 match = of_match_device(tegra_kbc_of_match, &pdev->dev);
623
624 kbc = devm_kzalloc(&pdev->dev, sizeof(*kbc), GFP_KERNEL);
625 if (!kbc) {
626 dev_err(&pdev->dev, "failed to alloc memory for kbc\n");
627 return -ENOMEM;
628 }
629
630 kbc->dev = &pdev->dev;
631 kbc->hw_support = match->data;
632 kbc->max_keys = kbc->hw_support->max_rows *
633 kbc->hw_support->max_columns;
634 kbc->num_rows_and_columns = kbc->hw_support->max_rows +
635 kbc->hw_support->max_columns;
636 keymap_rows = kbc->max_keys;
637 spin_lock_init(&kbc->lock);
638
639 err = tegra_kbc_parse_dt(kbc);
640 if (err)
641 return err;
642
643 if (!tegra_kbc_check_pin_cfg(kbc, &num_rows))
644 return -EINVAL;
645
646 kbc->irq = platform_get_irq(pdev, 0);
647 if (kbc->irq < 0) {
648 dev_err(&pdev->dev, "failed to get keyboard IRQ\n");
649 return -ENXIO;
650 }
651
652 kbc->idev = devm_input_allocate_device(&pdev->dev);
653 if (!kbc->idev) {
654 dev_err(&pdev->dev, "failed to allocate input device\n");
655 return -ENOMEM;
656 }
657
658 timer_setup(&kbc->timer, tegra_kbc_keypress_timer, 0);
659
660 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
661 kbc->mmio = devm_ioremap_resource(&pdev->dev, res);
662 if (IS_ERR(kbc->mmio))
663 return PTR_ERR(kbc->mmio);
664
665 kbc->clk = devm_clk_get(&pdev->dev, NULL);
666 if (IS_ERR(kbc->clk)) {
667 dev_err(&pdev->dev, "failed to get keyboard clock\n");
668 return PTR_ERR(kbc->clk);
669 }
670
671 kbc->rst = devm_reset_control_get(&pdev->dev, "kbc");
672 if (IS_ERR(kbc->rst)) {
673 dev_err(&pdev->dev, "failed to get keyboard reset\n");
674 return PTR_ERR(kbc->rst);
675 }
676
677 /*
678 * The time delay between two consecutive reads of the FIFO is
679 * the sum of the repeat time and the time taken for scanning
680 * the rows. There is an additional delay before the row scanning
681 * starts. The repoll delay is computed in milliseconds.
682 */
683 debounce_cnt = min(kbc->debounce_cnt, KBC_MAX_DEBOUNCE_CNT);
684 scan_time_rows = (KBC_ROW_SCAN_TIME + debounce_cnt) * num_rows;
685 kbc->repoll_dly = KBC_ROW_SCAN_DLY + scan_time_rows + kbc->repeat_cnt;
686 kbc->repoll_dly = DIV_ROUND_UP(kbc->repoll_dly, KBC_CYCLE_MS);
687
688 kbc->idev->name = pdev->name;
689 kbc->idev->id.bustype = BUS_HOST;
690 kbc->idev->dev.parent = &pdev->dev;
691 kbc->idev->open = tegra_kbc_open;
692 kbc->idev->close = tegra_kbc_close;
693
694 if (kbc->keymap_data && kbc->use_fn_map)
695 keymap_rows *= 2;
696
697 err = matrix_keypad_build_keymap(kbc->keymap_data, NULL,
698 keymap_rows,
699 kbc->hw_support->max_columns,
700 kbc->keycode, kbc->idev);
701 if (err) {
702 dev_err(&pdev->dev, "failed to setup keymap\n");
703 return err;
704 }
705
706 __set_bit(EV_REP, kbc->idev->evbit);
707 input_set_capability(kbc->idev, EV_MSC, MSC_SCAN);
708
709 input_set_drvdata(kbc->idev, kbc);
710
711 err = devm_request_irq(&pdev->dev, kbc->irq, tegra_kbc_isr,
712 IRQF_TRIGGER_HIGH, pdev->name, kbc);
713 if (err) {
714 dev_err(&pdev->dev, "failed to request keyboard IRQ\n");
715 return err;
716 }
717
718 disable_irq(kbc->irq);
719
720 err = input_register_device(kbc->idev);
721 if (err) {
722 dev_err(&pdev->dev, "failed to register input device\n");
723 return err;
724 }
725
726 platform_set_drvdata(pdev, kbc);
727 device_init_wakeup(&pdev->dev, kbc->wakeup);
728
729 return 0;
730 }
731
732 #ifdef CONFIG_PM_SLEEP
tegra_kbc_set_keypress_interrupt(struct tegra_kbc * kbc,bool enable)733 static void tegra_kbc_set_keypress_interrupt(struct tegra_kbc *kbc, bool enable)
734 {
735 u32 val;
736
737 val = readl(kbc->mmio + KBC_CONTROL_0);
738 if (enable)
739 val |= KBC_CONTROL_KEYPRESS_INT_EN;
740 else
741 val &= ~KBC_CONTROL_KEYPRESS_INT_EN;
742 writel(val, kbc->mmio + KBC_CONTROL_0);
743 }
744
tegra_kbc_suspend(struct device * dev)745 static int tegra_kbc_suspend(struct device *dev)
746 {
747 struct platform_device *pdev = to_platform_device(dev);
748 struct tegra_kbc *kbc = platform_get_drvdata(pdev);
749
750 mutex_lock(&kbc->idev->mutex);
751 if (device_may_wakeup(&pdev->dev)) {
752 disable_irq(kbc->irq);
753 del_timer_sync(&kbc->timer);
754 tegra_kbc_set_fifo_interrupt(kbc, false);
755
756 /* Forcefully clear the interrupt status */
757 writel(0x7, kbc->mmio + KBC_INT_0);
758 /*
759 * Store the previous resident time of continuous polling mode.
760 * Force the keyboard into interrupt mode.
761 */
762 kbc->cp_to_wkup_dly = readl(kbc->mmio + KBC_TO_CNT_0);
763 writel(0, kbc->mmio + KBC_TO_CNT_0);
764
765 tegra_kbc_setup_wakekeys(kbc, true);
766 msleep(30);
767
768 kbc->keypress_caused_wake = false;
769 /* Enable keypress interrupt before going into suspend. */
770 tegra_kbc_set_keypress_interrupt(kbc, true);
771 enable_irq(kbc->irq);
772 enable_irq_wake(kbc->irq);
773 } else {
774 if (kbc->idev->users)
775 tegra_kbc_stop(kbc);
776 }
777 mutex_unlock(&kbc->idev->mutex);
778
779 return 0;
780 }
781
tegra_kbc_resume(struct device * dev)782 static int tegra_kbc_resume(struct device *dev)
783 {
784 struct platform_device *pdev = to_platform_device(dev);
785 struct tegra_kbc *kbc = platform_get_drvdata(pdev);
786 int err = 0;
787
788 mutex_lock(&kbc->idev->mutex);
789 if (device_may_wakeup(&pdev->dev)) {
790 disable_irq_wake(kbc->irq);
791 tegra_kbc_setup_wakekeys(kbc, false);
792 /* We will use fifo interrupts for key detection. */
793 tegra_kbc_set_keypress_interrupt(kbc, false);
794
795 /* Restore the resident time of continuous polling mode. */
796 writel(kbc->cp_to_wkup_dly, kbc->mmio + KBC_TO_CNT_0);
797
798 tegra_kbc_set_fifo_interrupt(kbc, true);
799
800 if (kbc->keypress_caused_wake && kbc->wakeup_key) {
801 /*
802 * We can't report events directly from the ISR
803 * because timekeeping is stopped when processing
804 * wakeup request and we get a nasty warning when
805 * we try to call do_gettimeofday() in evdev
806 * handler.
807 */
808 input_report_key(kbc->idev, kbc->wakeup_key, 1);
809 input_sync(kbc->idev);
810 input_report_key(kbc->idev, kbc->wakeup_key, 0);
811 input_sync(kbc->idev);
812 }
813 } else {
814 if (kbc->idev->users)
815 err = tegra_kbc_start(kbc);
816 }
817 mutex_unlock(&kbc->idev->mutex);
818
819 return err;
820 }
821 #endif
822
823 static SIMPLE_DEV_PM_OPS(tegra_kbc_pm_ops, tegra_kbc_suspend, tegra_kbc_resume);
824
825 static struct platform_driver tegra_kbc_driver = {
826 .probe = tegra_kbc_probe,
827 .driver = {
828 .name = "tegra-kbc",
829 .pm = &tegra_kbc_pm_ops,
830 .of_match_table = tegra_kbc_of_match,
831 },
832 };
833 module_platform_driver(tegra_kbc_driver);
834
835 MODULE_LICENSE("GPL");
836 MODULE_AUTHOR("Rakesh Iyer <riyer@nvidia.com>");
837 MODULE_DESCRIPTION("Tegra matrix keyboard controller driver");
838 MODULE_ALIAS("platform:tegra-kbc");
839
