2 * Keyboard class input driver for the NVIDIA Tegra SoC internal matrix
5 * Copyright (c) 2009-2011, NVIDIA Corporation.
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.
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
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.
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>
28 #include <linux/interrupt.h>
30 #include <linux/clk.h>
31 #include <linux/slab.h>
35 #define KBC_MAX_DEBOUNCE_CNT 0x3ffu
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
41 /* KBC uses a 32KHz clock so a cycle = 1/32Khz */
42 #define KBC_CYCLE_MS 32
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)
54 /* KBC Interrupt Register */
56 #define KBC_INT_FIFO_CNT_INT_STATUS (1 << 2)
57 #define KBC_INT_KEYPRESS_INT_STATUS (1 << 0)
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
68 #define KBC_ROW_SHIFT 3
72 struct input_dev *idev;
75 unsigned int repoll_dly;
76 unsigned long cp_dly_jiffies;
77 unsigned int cp_to_wkup_dly;
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;
86 struct timer_list timer;
90 static const u32 tegra_kbc_default_keymap[] __devinitdata = {
97 KEY(1, 7, KEY_LEFTMETA),
99 KEY(2, 6, KEY_RIGHTALT),
100 KEY(2, 7, KEY_LEFTALT),
117 KEY(4, 7, KEY_SPACE),
126 KEY(5, 7, KEY_BACKSLASH),
128 KEY(6, 0, KEY_MINUS),
134 KEY(6, 6, KEY_COMMA),
137 KEY(7, 1, KEY_EQUAL),
138 KEY(7, 2, KEY_RIGHTBRACE),
139 KEY(7, 3, KEY_ENTER),
142 KEY(8, 4, KEY_RIGHTSHIFT),
143 KEY(8, 5, KEY_LEFTSHIFT),
145 KEY(9, 5, KEY_RIGHTCTRL),
146 KEY(9, 7, KEY_LEFTCTRL),
148 KEY(11, 0, KEY_LEFTBRACE),
150 KEY(11, 2, KEY_APOSTROPHE),
151 KEY(11, 3, KEY_SEMICOLON),
152 KEY(11, 4, KEY_SLASH),
157 KEY(12, 2, KEY_BACKSPACE),
161 KEY(12, 6, KEY_PRINT),
162 KEY(12, 7, KEY_PAUSE),
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),
182 KEY(15, 1, KEY_GRAVE),
187 KEY(15, 6, KEY_CAPSLOCK),
190 /* Software Handled Function Keys */
198 KEY(22, 1, KEY_KPSLASH),
205 KEY(27, 1, KEY_KPASTERISK),
206 KEY(27, 3, KEY_KPMINUS),
207 KEY(27, 4, KEY_KPPLUS),
208 KEY(27, 5, KEY_KPDOT),
210 KEY(28, 5, KEY_VOLUMEUP),
212 KEY(29, 3, KEY_HOME),
214 KEY(29, 5, KEY_BRIGHTNESSDOWN),
215 KEY(29, 6, KEY_VOLUMEDOWN),
216 KEY(29, 7, KEY_BRIGHTNESSUP),
218 KEY(30, 0, KEY_NUMLOCK),
219 KEY(30, 1, KEY_SCROLLLOCK),
220 KEY(30, 2, KEY_MUTE),
222 KEY(31, 4, KEY_HELP),
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),
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)
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])
244 if (j == new_num_keys)
245 input_report_key(input, old_keycodes[i], 0);
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)
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);
262 static void tegra_kbc_report_keys(struct tegra_kbc *kbc)
264 unsigned char scancodes[KBC_MAX_KPENT];
265 unsigned short keycodes[KBC_MAX_KPENT];
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;
273 for (i = 0; i < KBC_MAX_KPENT; i++) {
275 val = readl(kbc->mmio + KBC_KP_ENT0_0 + i);
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);
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)
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.
301 if (kbc->use_ghost_filter && num_down >= 3) {
302 for (i = 0; i < num_down; i++) {
304 u8 curr_col = scancodes[i] & 0x07;
305 u8 curr_row = scancodes[i] >> KBC_ROW_SHIFT;
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.
311 for (j = i + 1; j < num_down; j++) {
312 u8 col = scancodes[j] & 0x07;
313 u8 row = scancodes[j] >> KBC_ROW_SHIFT;
316 key_in_same_col = true;
318 key_in_same_row = true;
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.
328 for (i = 0; i < num_down; i++) {
329 scancodes[i] += KBC_MAX_KEY;
330 keycodes[i] = kbc->keycode[scancodes[i]];
334 /* Ignore the key presses for this iteration? */
335 if (key_in_same_col && key_in_same_row)
338 tegra_kbc_report_released_keys(kbc->idev,
339 kbc->current_keys, kbc->num_pressed_keys,
341 tegra_kbc_report_pressed_keys(kbc->idev, scancodes, keycodes, num_down);
342 input_sync(kbc->idev);
344 memcpy(kbc->current_keys, keycodes, sizeof(kbc->current_keys));
345 kbc->num_pressed_keys = num_down;
348 static void tegra_kbc_set_fifo_interrupt(struct tegra_kbc *kbc, bool enable)
352 val = readl(kbc->mmio + KBC_CONTROL_0);
354 val |= KBC_CONTROL_FIFO_CNT_INT_EN;
356 val &= ~KBC_CONTROL_FIFO_CNT_INT_EN;
357 writel(val, kbc->mmio + KBC_CONTROL_0);
360 static void tegra_kbc_set_keypress_interrupt(struct tegra_kbc *kbc, bool enable)
364 val = readl(kbc->mmio + KBC_CONTROL_0);
366 val |= KBC_CONTROL_KEYPRESS_INT_EN;
368 val &= ~KBC_CONTROL_KEYPRESS_INT_EN;
369 writel(val, kbc->mmio + KBC_CONTROL_0);
372 static void tegra_kbc_keypress_timer(unsigned long data)
374 struct tegra_kbc *kbc = (struct tegra_kbc *)data;
379 spin_lock_irqsave(&kbc->lock, flags);
381 val = (readl(kbc->mmio + KBC_INT_0) >> 4) & 0xf;
385 tegra_kbc_report_keys(kbc);
388 * If more than one keys are pressed we need not wait
389 * for the repoll delay.
391 dly = (val == 1) ? kbc->repoll_dly : 1;
392 mod_timer(&kbc->timer, jiffies + msecs_to_jiffies(dly));
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);
399 kbc->num_pressed_keys = 0;
401 /* All keys are released so enable the keypress interrupt */
402 tegra_kbc_set_fifo_interrupt(kbc, true);
405 spin_unlock_irqrestore(&kbc->lock, flags);
408 static irqreturn_t tegra_kbc_isr(int irq, void *args)
410 struct tegra_kbc *kbc = args;
414 spin_lock_irqsave(&kbc->lock, flags);
417 * Quickly bail out & reenable interrupts if the fifo threshold
418 * count interrupt wasn't the interrupt source
420 val = readl(kbc->mmio + KBC_INT_0);
421 writel(val, kbc->mmio + KBC_INT_0);
423 if (val & KBC_INT_FIFO_CNT_INT_STATUS) {
425 * Until all keys are released, defer further processing to
426 * the polling loop in tegra_kbc_keypress_timer.
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;
435 spin_unlock_irqrestore(&kbc->lock, flags);
440 static void tegra_kbc_setup_wakekeys(struct tegra_kbc *kbc, bool filter)
442 const struct tegra_kbc_platform_data *pdata = kbc->pdata;
444 unsigned int rst_val;
446 /* Either mask all keys or none. */
447 rst_val = (filter && !pdata->wakeup) ? ~0 : 0;
449 for (i = 0; i < KBC_MAX_ROW; i++)
450 writel(rst_val, kbc->mmio + KBC_ROW0_MASK_0 + i * 4);
453 static void tegra_kbc_config_pins(struct tegra_kbc *kbc)
455 const struct tegra_kbc_platform_data *pdata = kbc->pdata;
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);
471 switch (pdata->pin_cfg[i].type) {
473 row_cfg |= ((pdata->pin_cfg[i].num << 1) | 1) << r_shft;
477 col_cfg |= ((pdata->pin_cfg[i].num << 1) | 1) << c_shft;
484 writel(row_cfg, kbc->mmio + r_offs);
485 writel(col_cfg, kbc->mmio + c_offs);
489 static int tegra_kbc_start(struct tegra_kbc *kbc)
491 const struct tegra_kbc_platform_data *pdata = kbc->pdata;
492 unsigned int debounce_cnt;
495 clk_enable(kbc->clk);
497 /* Reset the KBC controller to clear all previous status.*/
498 tegra_periph_reset_assert(kbc->clk);
500 tegra_periph_reset_deassert(kbc->clk);
503 tegra_kbc_config_pins(kbc);
504 tegra_kbc_setup_wakekeys(kbc, false);
506 writel(pdata->repeat_cnt, kbc->mmio + KBC_RPT_DLY_0);
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);
517 * Compute the delay(ns) from interrupt mode to continuous polling
518 * mode so the timer routine is scheduled appropriately.
520 val = readl(kbc->mmio + KBC_INIT_DLY_0);
521 kbc->cp_dly_jiffies = usecs_to_jiffies((val & 0xfffff) * 32);
523 kbc->num_pressed_keys = 0;
526 * Atomically clear out any remaining entries in the key FIFO
527 * and enable keyboard interrupts.
530 val = readl(kbc->mmio + KBC_INT_0);
535 val = readl(kbc->mmio + KBC_KP_ENT0_0);
536 val = readl(kbc->mmio + KBC_KP_ENT1_0);
538 writel(0x7, kbc->mmio + KBC_INT_0);
540 enable_irq(kbc->irq);
545 static void tegra_kbc_stop(struct tegra_kbc *kbc)
550 spin_lock_irqsave(&kbc->lock, flags);
551 val = readl(kbc->mmio + KBC_CONTROL_0);
553 writel(val, kbc->mmio + KBC_CONTROL_0);
554 spin_unlock_irqrestore(&kbc->lock, flags);
556 disable_irq(kbc->irq);
557 del_timer_sync(&kbc->timer);
559 clk_disable(kbc->clk);
562 static int tegra_kbc_open(struct input_dev *dev)
564 struct tegra_kbc *kbc = input_get_drvdata(dev);
566 return tegra_kbc_start(kbc);
569 static void tegra_kbc_close(struct input_dev *dev)
571 struct tegra_kbc *kbc = input_get_drvdata(dev);
573 return tegra_kbc_stop(kbc);
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)
584 for (i = 0; i < KBC_MAX_GPIO; i++) {
585 const struct tegra_kbc_pin_cfg *pin_cfg = &pdata->pin_cfg[i];
587 switch (pin_cfg->type) {
589 if (pin_cfg->num >= KBC_MAX_ROW) {
591 "pin_cfg[%d]: invalid row number %d\n",
599 if (pin_cfg->num >= KBC_MAX_COL) {
601 "pin_cfg[%d]: invalid column number %d\n",
612 "pin_cfg[%d]: invalid entry type %d\n",
613 pin_cfg->type, pin_cfg->num);
622 static struct tegra_kbc_platform_data * __devinit tegra_kbc_dt_parse_pdata(
623 struct platform_device *pdev)
625 struct tegra_kbc_platform_data *pdata;
626 struct device_node *np = pdev->dev.of_node;
633 pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
637 if (!of_property_read_u32(np, "nvidia,debounce-delay-ms", &prop))
638 pdata->debounce_cnt = prop;
640 if (!of_property_read_u32(np, "nvidia,repeat-delay-ms", &prop))
641 pdata->repeat_cnt = prop;
643 if (of_find_property(np, "nvidia,needs-ghost-filter", NULL))
644 pdata->use_ghost_filter = true;
646 if (of_find_property(np, "nvidia,wakeup-source", NULL))
647 pdata->wakeup = true;
650 * All currently known keymaps with device tree support use the same
651 * pin_cfg, so set it up here.
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;
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;
666 static inline struct tegra_kbc_platform_data *tegra_kbc_dt_parse_pdata(
667 struct platform_device *pdev)
673 static int __devinit tegra_kbd_setup_keymap(struct tegra_kbc *kbc)
675 const struct tegra_kbc_platform_data *pdata = kbc->pdata;
676 const struct matrix_keymap_data *keymap_data = pdata->keymap_data;
677 unsigned int keymap_rows = KBC_MAX_KEY;
680 if (keymap_data && pdata->use_fn_map)
683 retval = matrix_keypad_build_keymap(keymap_data, NULL,
684 keymap_rows, KBC_MAX_COL,
685 kbc->keycode, kbc->idev);
686 if (retval == -ENOSYS || retval == -ENOENT) {
688 * If there is no OF support in kernel or keymap
689 * property is missing, use default keymap.
691 retval = matrix_keypad_build_keymap(
692 &tegra_kbc_default_keymap_data, NULL,
693 keymap_rows, KBC_MAX_COL,
694 kbc->keycode, kbc->idev);
700 static int __devinit tegra_kbc_probe(struct platform_device *pdev)
702 const struct tegra_kbc_platform_data *pdata = pdev->dev.platform_data;
703 struct tegra_kbc *kbc;
704 struct input_dev *input_dev;
705 struct resource *res;
709 unsigned int debounce_cnt;
710 unsigned int scan_time_rows;
713 pdata = tegra_kbc_dt_parse_pdata(pdev);
718 if (!tegra_kbc_check_pin_cfg(pdata, &pdev->dev, &num_rows)) {
723 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
725 dev_err(&pdev->dev, "failed to get I/O memory\n");
730 irq = platform_get_irq(pdev, 0);
732 dev_err(&pdev->dev, "failed to get keyboard IRQ\n");
737 kbc = kzalloc(sizeof(*kbc), GFP_KERNEL);
738 input_dev = input_allocate_device();
739 if (!kbc || !input_dev) {
745 kbc->idev = input_dev;
747 spin_lock_init(&kbc->lock);
748 setup_timer(&kbc->timer, tegra_kbc_keypress_timer, (unsigned long)kbc);
750 res = request_mem_region(res->start, resource_size(res), pdev->name);
752 dev_err(&pdev->dev, "failed to request I/O memory\n");
757 kbc->mmio = ioremap(res->start, resource_size(res));
759 dev_err(&pdev->dev, "failed to remap I/O memory\n");
761 goto err_free_mem_region;
764 kbc->clk = clk_get(&pdev->dev, NULL);
765 if (IS_ERR(kbc->clk)) {
766 dev_err(&pdev->dev, "failed to get keyboard clock\n");
767 err = PTR_ERR(kbc->clk);
772 * The time delay between two consecutive reads of the FIFO is
773 * the sum of the repeat time and the time taken for scanning
774 * the rows. There is an additional delay before the row scanning
775 * starts. The repoll delay is computed in milliseconds.
777 debounce_cnt = min(pdata->debounce_cnt, KBC_MAX_DEBOUNCE_CNT);
778 scan_time_rows = (KBC_ROW_SCAN_TIME + debounce_cnt) * num_rows;
779 kbc->repoll_dly = KBC_ROW_SCAN_DLY + scan_time_rows + pdata->repeat_cnt;
780 kbc->repoll_dly = DIV_ROUND_UP(kbc->repoll_dly, KBC_CYCLE_MS);
782 kbc->wakeup_key = pdata->wakeup_key;
783 kbc->use_fn_map = pdata->use_fn_map;
784 kbc->use_ghost_filter = pdata->use_ghost_filter;
786 input_dev->name = pdev->name;
787 input_dev->id.bustype = BUS_HOST;
788 input_dev->dev.parent = &pdev->dev;
789 input_dev->open = tegra_kbc_open;
790 input_dev->close = tegra_kbc_close;
792 err = tegra_kbd_setup_keymap(kbc);
794 dev_err(&pdev->dev, "failed to setup keymap\n");
798 __set_bit(EV_REP, input_dev->evbit);
799 input_set_capability(input_dev, EV_MSC, MSC_SCAN);
801 input_set_drvdata(input_dev, kbc);
803 err = request_irq(kbc->irq, tegra_kbc_isr,
804 IRQF_NO_SUSPEND | IRQF_TRIGGER_HIGH, pdev->name, kbc);
806 dev_err(&pdev->dev, "failed to request keyboard IRQ\n");
810 disable_irq(kbc->irq);
812 err = input_register_device(kbc->idev);
814 dev_err(&pdev->dev, "failed to register input device\n");
818 platform_set_drvdata(pdev, kbc);
819 device_init_wakeup(&pdev->dev, pdata->wakeup);
824 free_irq(kbc->irq, pdev);
830 release_mem_region(res->start, resource_size(res));
832 input_free_device(input_dev);
835 if (!pdev->dev.platform_data)
841 static int __devexit tegra_kbc_remove(struct platform_device *pdev)
843 struct tegra_kbc *kbc = platform_get_drvdata(pdev);
844 struct resource *res;
846 platform_set_drvdata(pdev, NULL);
848 free_irq(kbc->irq, pdev);
851 input_unregister_device(kbc->idev);
853 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
854 release_mem_region(res->start, resource_size(res));
857 * If we do not have platform data attached to the device we
858 * allocated it ourselves and thus need to free it.
860 if (!pdev->dev.platform_data)
868 #ifdef CONFIG_PM_SLEEP
869 static int tegra_kbc_suspend(struct device *dev)
871 struct platform_device *pdev = to_platform_device(dev);
872 struct tegra_kbc *kbc = platform_get_drvdata(pdev);
874 mutex_lock(&kbc->idev->mutex);
875 if (device_may_wakeup(&pdev->dev)) {
876 disable_irq(kbc->irq);
877 del_timer_sync(&kbc->timer);
878 tegra_kbc_set_fifo_interrupt(kbc, false);
880 /* Forcefully clear the interrupt status */
881 writel(0x7, kbc->mmio + KBC_INT_0);
883 * Store the previous resident time of continuous polling mode.
884 * Force the keyboard into interrupt mode.
886 kbc->cp_to_wkup_dly = readl(kbc->mmio + KBC_TO_CNT_0);
887 writel(0, kbc->mmio + KBC_TO_CNT_0);
889 tegra_kbc_setup_wakekeys(kbc, true);
892 kbc->keypress_caused_wake = false;
893 /* Enable keypress interrupt before going into suspend. */
894 tegra_kbc_set_keypress_interrupt(kbc, true);
895 enable_irq(kbc->irq);
896 enable_irq_wake(kbc->irq);
898 if (kbc->idev->users)
901 mutex_unlock(&kbc->idev->mutex);
906 static int tegra_kbc_resume(struct device *dev)
908 struct platform_device *pdev = to_platform_device(dev);
909 struct tegra_kbc *kbc = platform_get_drvdata(pdev);
912 mutex_lock(&kbc->idev->mutex);
913 if (device_may_wakeup(&pdev->dev)) {
914 disable_irq_wake(kbc->irq);
915 tegra_kbc_setup_wakekeys(kbc, false);
916 /* We will use fifo interrupts for key detection. */
917 tegra_kbc_set_keypress_interrupt(kbc, false);
919 /* Restore the resident time of continuous polling mode. */
920 writel(kbc->cp_to_wkup_dly, kbc->mmio + KBC_TO_CNT_0);
922 tegra_kbc_set_fifo_interrupt(kbc, true);
924 if (kbc->keypress_caused_wake && kbc->wakeup_key) {
926 * We can't report events directly from the ISR
927 * because timekeeping is stopped when processing
928 * wakeup request and we get a nasty warning when
929 * we try to call do_gettimeofday() in evdev
932 input_report_key(kbc->idev, kbc->wakeup_key, 1);
933 input_sync(kbc->idev);
934 input_report_key(kbc->idev, kbc->wakeup_key, 0);
935 input_sync(kbc->idev);
938 if (kbc->idev->users)
939 err = tegra_kbc_start(kbc);
941 mutex_unlock(&kbc->idev->mutex);
947 static SIMPLE_DEV_PM_OPS(tegra_kbc_pm_ops, tegra_kbc_suspend, tegra_kbc_resume);
949 static const struct of_device_id tegra_kbc_of_match[] = {
950 { .compatible = "nvidia,tegra20-kbc", },
953 MODULE_DEVICE_TABLE(of, tegra_kbc_of_match);
955 static struct platform_driver tegra_kbc_driver = {
956 .probe = tegra_kbc_probe,
957 .remove = __devexit_p(tegra_kbc_remove),
960 .owner = THIS_MODULE,
961 .pm = &tegra_kbc_pm_ops,
962 .of_match_table = tegra_kbc_of_match,
965 module_platform_driver(tegra_kbc_driver);
967 MODULE_LICENSE("GPL");
968 MODULE_AUTHOR("Rakesh Iyer <riyer@nvidia.com>");
969 MODULE_DESCRIPTION("Tegra matrix keyboard controller driver");
970 MODULE_ALIAS("platform:tegra-kbc");