Commit | Line | Data |
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16216333 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
11f5b30d RI |
2 | /* |
3 | * Keyboard class input driver for the NVIDIA Tegra SoC internal matrix | |
4 | * keyboard controller | |
5 | * | |
6 | * Copyright (c) 2009-2011, NVIDIA Corporation. | |
11f5b30d RI |
7 | */ |
8 | ||
3f27757a | 9 | #include <linux/kernel.h> |
11f5b30d RI |
10 | #include <linux/module.h> |
11 | #include <linux/input.h> | |
12 | #include <linux/platform_device.h> | |
13 | #include <linux/delay.h> | |
14 | #include <linux/io.h> | |
15 | #include <linux/interrupt.h> | |
a445c7f0 | 16 | #include <linux/of.h> |
e10af9e7 | 17 | #include <linux/of_device.h> |
11f5b30d RI |
18 | #include <linux/clk.h> |
19 | #include <linux/slab.h> | |
9eee07d3 | 20 | #include <linux/input/matrix_keypad.h> |
fe6b0dfa | 21 | #include <linux/reset.h> |
ba52a7fc | 22 | #include <linux/err.h> |
11f5b30d | 23 | |
9eee07d3 SW |
24 | #define KBC_MAX_KPENT 8 |
25 | ||
e10af9e7 LD |
26 | /* Maximum row/column supported by Tegra KBC yet is 16x8 */ |
27 | #define KBC_MAX_GPIO 24 | |
28 | /* Maximum keys supported by Tegra KBC yet is 16 x 8*/ | |
29 | #define KBC_MAX_KEY (16 * 8) | |
9eee07d3 | 30 | |
11f5b30d RI |
31 | #define KBC_MAX_DEBOUNCE_CNT 0x3ffu |
32 | ||
33 | /* KBC row scan time and delay for beginning the row scan. */ | |
34 | #define KBC_ROW_SCAN_TIME 16 | |
35 | #define KBC_ROW_SCAN_DLY 5 | |
36 | ||
37 | /* KBC uses a 32KHz clock so a cycle = 1/32Khz */ | |
3f27757a | 38 | #define KBC_CYCLE_MS 32 |
11f5b30d RI |
39 | |
40 | /* KBC Registers */ | |
41 | ||
42 | /* KBC Control Register */ | |
43 | #define KBC_CONTROL_0 0x0 | |
44 | #define KBC_FIFO_TH_CNT_SHIFT(cnt) (cnt << 14) | |
45 | #define KBC_DEBOUNCE_CNT_SHIFT(cnt) (cnt << 4) | |
46 | #define KBC_CONTROL_FIFO_CNT_INT_EN (1 << 3) | |
b6834b02 | 47 | #define KBC_CONTROL_KEYPRESS_INT_EN (1 << 1) |
11f5b30d RI |
48 | #define KBC_CONTROL_KBC_EN (1 << 0) |
49 | ||
50 | /* KBC Interrupt Register */ | |
51 | #define KBC_INT_0 0x4 | |
52 | #define KBC_INT_FIFO_CNT_INT_STATUS (1 << 2) | |
fd0fc213 | 53 | #define KBC_INT_KEYPRESS_INT_STATUS (1 << 0) |
11f5b30d RI |
54 | |
55 | #define KBC_ROW_CFG0_0 0x8 | |
56 | #define KBC_COL_CFG0_0 0x18 | |
d0d150ec | 57 | #define KBC_TO_CNT_0 0x24 |
11f5b30d RI |
58 | #define KBC_INIT_DLY_0 0x28 |
59 | #define KBC_RPT_DLY_0 0x2c | |
60 | #define KBC_KP_ENT0_0 0x30 | |
61 | #define KBC_KP_ENT1_0 0x34 | |
62 | #define KBC_ROW0_MASK_0 0x38 | |
63 | ||
64 | #define KBC_ROW_SHIFT 3 | |
65 | ||
9eee07d3 SW |
66 | enum tegra_pin_type { |
67 | PIN_CFG_IGNORE, | |
68 | PIN_CFG_COL, | |
69 | PIN_CFG_ROW, | |
70 | }; | |
71 | ||
e10af9e7 LD |
72 | /* Tegra KBC hw support */ |
73 | struct tegra_kbc_hw_support { | |
74 | int max_rows; | |
75 | int max_columns; | |
76 | }; | |
77 | ||
9eee07d3 SW |
78 | struct tegra_kbc_pin_cfg { |
79 | enum tegra_pin_type type; | |
80 | unsigned char num; | |
81 | }; | |
82 | ||
11f5b30d | 83 | struct tegra_kbc { |
9eee07d3 SW |
84 | struct device *dev; |
85 | unsigned int debounce_cnt; | |
86 | unsigned int repeat_cnt; | |
87 | struct tegra_kbc_pin_cfg pin_cfg[KBC_MAX_GPIO]; | |
88 | const struct matrix_keymap_data *keymap_data; | |
89 | bool wakeup; | |
11f5b30d RI |
90 | void __iomem *mmio; |
91 | struct input_dev *idev; | |
9eee07d3 | 92 | int irq; |
11f5b30d RI |
93 | spinlock_t lock; |
94 | unsigned int repoll_dly; | |
95 | unsigned long cp_dly_jiffies; | |
d0d150ec | 96 | unsigned int cp_to_wkup_dly; |
4e8b65f6 | 97 | bool use_fn_map; |
34abeeb2 | 98 | bool use_ghost_filter; |
fd0fc213 | 99 | bool keypress_caused_wake; |
4e8b65f6 | 100 | unsigned short keycode[KBC_MAX_KEY * 2]; |
11f5b30d RI |
101 | unsigned short current_keys[KBC_MAX_KPENT]; |
102 | unsigned int num_pressed_keys; | |
fd0fc213 | 103 | u32 wakeup_key; |
11f5b30d RI |
104 | struct timer_list timer; |
105 | struct clk *clk; | |
fe6b0dfa | 106 | struct reset_control *rst; |
e10af9e7 LD |
107 | const struct tegra_kbc_hw_support *hw_support; |
108 | int max_keys; | |
109 | int num_rows_and_columns; | |
11f5b30d RI |
110 | }; |
111 | ||
11f5b30d RI |
112 | static void tegra_kbc_report_released_keys(struct input_dev *input, |
113 | unsigned short old_keycodes[], | |
114 | unsigned int old_num_keys, | |
115 | unsigned short new_keycodes[], | |
116 | unsigned int new_num_keys) | |
117 | { | |
118 | unsigned int i, j; | |
119 | ||
120 | for (i = 0; i < old_num_keys; i++) { | |
121 | for (j = 0; j < new_num_keys; j++) | |
122 | if (old_keycodes[i] == new_keycodes[j]) | |
123 | break; | |
124 | ||
125 | if (j == new_num_keys) | |
126 | input_report_key(input, old_keycodes[i], 0); | |
127 | } | |
128 | } | |
129 | ||
130 | static void tegra_kbc_report_pressed_keys(struct input_dev *input, | |
131 | unsigned char scancodes[], | |
132 | unsigned short keycodes[], | |
133 | unsigned int num_pressed_keys) | |
134 | { | |
135 | unsigned int i; | |
136 | ||
137 | for (i = 0; i < num_pressed_keys; i++) { | |
138 | input_event(input, EV_MSC, MSC_SCAN, scancodes[i]); | |
139 | input_report_key(input, keycodes[i], 1); | |
140 | } | |
141 | } | |
142 | ||
143 | static void tegra_kbc_report_keys(struct tegra_kbc *kbc) | |
144 | { | |
145 | unsigned char scancodes[KBC_MAX_KPENT]; | |
146 | unsigned short keycodes[KBC_MAX_KPENT]; | |
147 | u32 val = 0; | |
148 | unsigned int i; | |
149 | unsigned int num_down = 0; | |
4e8b65f6 | 150 | bool fn_keypress = false; |
34abeeb2 RI |
151 | bool key_in_same_row = false; |
152 | bool key_in_same_col = false; | |
11f5b30d | 153 | |
11f5b30d RI |
154 | for (i = 0; i < KBC_MAX_KPENT; i++) { |
155 | if ((i % 4) == 0) | |
156 | val = readl(kbc->mmio + KBC_KP_ENT0_0 + i); | |
157 | ||
158 | if (val & 0x80) { | |
159 | unsigned int col = val & 0x07; | |
160 | unsigned int row = (val >> 3) & 0x0f; | |
161 | unsigned char scancode = | |
162 | MATRIX_SCAN_CODE(row, col, KBC_ROW_SHIFT); | |
163 | ||
164 | scancodes[num_down] = scancode; | |
4e8b65f6 RI |
165 | keycodes[num_down] = kbc->keycode[scancode]; |
166 | /* If driver uses Fn map, do not report the Fn key. */ | |
167 | if ((keycodes[num_down] == KEY_FN) && kbc->use_fn_map) | |
168 | fn_keypress = true; | |
169 | else | |
170 | num_down++; | |
11f5b30d RI |
171 | } |
172 | ||
173 | val >>= 8; | |
174 | } | |
4e8b65f6 | 175 | |
34abeeb2 RI |
176 | /* |
177 | * Matrix keyboard designs are prone to keyboard ghosting. | |
178 | * Ghosting occurs if there are 3 keys such that - | |
179 | * any 2 of the 3 keys share a row, and any 2 of them share a column. | |
180 | * If so ignore the key presses for this iteration. | |
181 | */ | |
95439cba | 182 | if (kbc->use_ghost_filter && num_down >= 3) { |
34abeeb2 RI |
183 | for (i = 0; i < num_down; i++) { |
184 | unsigned int j; | |
185 | u8 curr_col = scancodes[i] & 0x07; | |
186 | u8 curr_row = scancodes[i] >> KBC_ROW_SHIFT; | |
187 | ||
188 | /* | |
189 | * Find 2 keys such that one key is in the same row | |
190 | * and the other is in the same column as the i-th key. | |
191 | */ | |
192 | for (j = i + 1; j < num_down; j++) { | |
193 | u8 col = scancodes[j] & 0x07; | |
194 | u8 row = scancodes[j] >> KBC_ROW_SHIFT; | |
195 | ||
196 | if (col == curr_col) | |
197 | key_in_same_col = true; | |
198 | if (row == curr_row) | |
199 | key_in_same_row = true; | |
200 | } | |
201 | } | |
202 | } | |
203 | ||
4e8b65f6 RI |
204 | /* |
205 | * If the platform uses Fn keymaps, translate keys on a Fn keypress. | |
e10af9e7 | 206 | * Function keycodes are max_keys apart from the plain keycodes. |
4e8b65f6 RI |
207 | */ |
208 | if (fn_keypress) { | |
209 | for (i = 0; i < num_down; i++) { | |
e10af9e7 | 210 | scancodes[i] += kbc->max_keys; |
4e8b65f6 RI |
211 | keycodes[i] = kbc->keycode[scancodes[i]]; |
212 | } | |
213 | } | |
214 | ||
34abeeb2 RI |
215 | /* Ignore the key presses for this iteration? */ |
216 | if (key_in_same_col && key_in_same_row) | |
217 | return; | |
218 | ||
11f5b30d RI |
219 | tegra_kbc_report_released_keys(kbc->idev, |
220 | kbc->current_keys, kbc->num_pressed_keys, | |
221 | keycodes, num_down); | |
222 | tegra_kbc_report_pressed_keys(kbc->idev, scancodes, keycodes, num_down); | |
223 | input_sync(kbc->idev); | |
224 | ||
225 | memcpy(kbc->current_keys, keycodes, sizeof(kbc->current_keys)); | |
226 | kbc->num_pressed_keys = num_down; | |
227 | } | |
228 | ||
d0d150ec RI |
229 | static void tegra_kbc_set_fifo_interrupt(struct tegra_kbc *kbc, bool enable) |
230 | { | |
231 | u32 val; | |
232 | ||
233 | val = readl(kbc->mmio + KBC_CONTROL_0); | |
234 | if (enable) | |
235 | val |= KBC_CONTROL_FIFO_CNT_INT_EN; | |
236 | else | |
237 | val &= ~KBC_CONTROL_FIFO_CNT_INT_EN; | |
238 | writel(val, kbc->mmio + KBC_CONTROL_0); | |
239 | } | |
240 | ||
4ea40278 | 241 | static void tegra_kbc_keypress_timer(struct timer_list *t) |
11f5b30d | 242 | { |
4ea40278 | 243 | struct tegra_kbc *kbc = from_timer(kbc, t, timer); |
11f5b30d RI |
244 | unsigned long flags; |
245 | u32 val; | |
246 | unsigned int i; | |
247 | ||
95439cba DT |
248 | spin_lock_irqsave(&kbc->lock, flags); |
249 | ||
11f5b30d RI |
250 | val = (readl(kbc->mmio + KBC_INT_0) >> 4) & 0xf; |
251 | if (val) { | |
252 | unsigned long dly; | |
253 | ||
254 | tegra_kbc_report_keys(kbc); | |
255 | ||
256 | /* | |
257 | * If more than one keys are pressed we need not wait | |
258 | * for the repoll delay. | |
259 | */ | |
260 | dly = (val == 1) ? kbc->repoll_dly : 1; | |
261 | mod_timer(&kbc->timer, jiffies + msecs_to_jiffies(dly)); | |
262 | } else { | |
263 | /* Release any pressed keys and exit the polling loop */ | |
264 | for (i = 0; i < kbc->num_pressed_keys; i++) | |
265 | input_report_key(kbc->idev, kbc->current_keys[i], 0); | |
266 | input_sync(kbc->idev); | |
267 | ||
268 | kbc->num_pressed_keys = 0; | |
269 | ||
270 | /* All keys are released so enable the keypress interrupt */ | |
d0d150ec | 271 | tegra_kbc_set_fifo_interrupt(kbc, true); |
11f5b30d | 272 | } |
95439cba DT |
273 | |
274 | spin_unlock_irqrestore(&kbc->lock, flags); | |
11f5b30d RI |
275 | } |
276 | ||
277 | static irqreturn_t tegra_kbc_isr(int irq, void *args) | |
278 | { | |
279 | struct tegra_kbc *kbc = args; | |
95439cba | 280 | unsigned long flags; |
d0d150ec | 281 | u32 val; |
11f5b30d | 282 | |
95439cba | 283 | spin_lock_irqsave(&kbc->lock, flags); |
11f5b30d RI |
284 | |
285 | /* | |
286 | * Quickly bail out & reenable interrupts if the fifo threshold | |
287 | * count interrupt wasn't the interrupt source | |
288 | */ | |
289 | val = readl(kbc->mmio + KBC_INT_0); | |
290 | writel(val, kbc->mmio + KBC_INT_0); | |
291 | ||
292 | if (val & KBC_INT_FIFO_CNT_INT_STATUS) { | |
293 | /* | |
95439cba DT |
294 | * Until all keys are released, defer further processing to |
295 | * the polling loop in tegra_kbc_keypress_timer. | |
11f5b30d | 296 | */ |
95439cba | 297 | tegra_kbc_set_fifo_interrupt(kbc, false); |
11f5b30d | 298 | mod_timer(&kbc->timer, jiffies + kbc->cp_dly_jiffies); |
fd0fc213 RI |
299 | } else if (val & KBC_INT_KEYPRESS_INT_STATUS) { |
300 | /* We can be here only through system resume path */ | |
301 | kbc->keypress_caused_wake = true; | |
11f5b30d RI |
302 | } |
303 | ||
95439cba DT |
304 | spin_unlock_irqrestore(&kbc->lock, flags); |
305 | ||
11f5b30d RI |
306 | return IRQ_HANDLED; |
307 | } | |
308 | ||
309 | static void tegra_kbc_setup_wakekeys(struct tegra_kbc *kbc, bool filter) | |
310 | { | |
11f5b30d RI |
311 | int i; |
312 | unsigned int rst_val; | |
313 | ||
baafb435 | 314 | /* Either mask all keys or none. */ |
9eee07d3 | 315 | rst_val = (filter && !kbc->wakeup) ? ~0 : 0; |
11f5b30d | 316 | |
e10af9e7 | 317 | for (i = 0; i < kbc->hw_support->max_rows; i++) |
11f5b30d | 318 | writel(rst_val, kbc->mmio + KBC_ROW0_MASK_0 + i * 4); |
11f5b30d RI |
319 | } |
320 | ||
321 | static void tegra_kbc_config_pins(struct tegra_kbc *kbc) | |
322 | { | |
11f5b30d RI |
323 | int i; |
324 | ||
325 | for (i = 0; i < KBC_MAX_GPIO; i++) { | |
326 | u32 r_shft = 5 * (i % 6); | |
327 | u32 c_shft = 4 * (i % 8); | |
7530c4a1 RI |
328 | u32 r_mask = 0x1f << r_shft; |
329 | u32 c_mask = 0x0f << c_shft; | |
11f5b30d RI |
330 | u32 r_offs = (i / 6) * 4 + KBC_ROW_CFG0_0; |
331 | u32 c_offs = (i / 8) * 4 + KBC_COL_CFG0_0; | |
332 | u32 row_cfg = readl(kbc->mmio + r_offs); | |
333 | u32 col_cfg = readl(kbc->mmio + c_offs); | |
334 | ||
335 | row_cfg &= ~r_mask; | |
336 | col_cfg &= ~c_mask; | |
337 | ||
9eee07d3 | 338 | switch (kbc->pin_cfg[i].type) { |
023cea0e | 339 | case PIN_CFG_ROW: |
9eee07d3 | 340 | row_cfg |= ((kbc->pin_cfg[i].num << 1) | 1) << r_shft; |
023cea0e SR |
341 | break; |
342 | ||
343 | case PIN_CFG_COL: | |
9eee07d3 | 344 | col_cfg |= ((kbc->pin_cfg[i].num << 1) | 1) << c_shft; |
023cea0e SR |
345 | break; |
346 | ||
347 | case PIN_CFG_IGNORE: | |
348 | break; | |
349 | } | |
11f5b30d RI |
350 | |
351 | writel(row_cfg, kbc->mmio + r_offs); | |
352 | writel(col_cfg, kbc->mmio + c_offs); | |
353 | } | |
354 | } | |
355 | ||
356 | static int tegra_kbc_start(struct tegra_kbc *kbc) | |
357 | { | |
11f5b30d RI |
358 | unsigned int debounce_cnt; |
359 | u32 val = 0; | |
8a7f102c | 360 | int ret; |
11f5b30d | 361 | |
8a7f102c AY |
362 | ret = clk_prepare_enable(kbc->clk); |
363 | if (ret) | |
364 | return ret; | |
11f5b30d RI |
365 | |
366 | /* Reset the KBC controller to clear all previous status.*/ | |
fe6b0dfa | 367 | reset_control_assert(kbc->rst); |
11f5b30d | 368 | udelay(100); |
fae16989 | 369 | reset_control_deassert(kbc->rst); |
11f5b30d RI |
370 | udelay(100); |
371 | ||
372 | tegra_kbc_config_pins(kbc); | |
373 | tegra_kbc_setup_wakekeys(kbc, false); | |
374 | ||
9eee07d3 | 375 | writel(kbc->repeat_cnt, kbc->mmio + KBC_RPT_DLY_0); |
11f5b30d RI |
376 | |
377 | /* Keyboard debounce count is maximum of 12 bits. */ | |
9eee07d3 | 378 | debounce_cnt = min(kbc->debounce_cnt, KBC_MAX_DEBOUNCE_CNT); |
11f5b30d RI |
379 | val = KBC_DEBOUNCE_CNT_SHIFT(debounce_cnt); |
380 | val |= KBC_FIFO_TH_CNT_SHIFT(1); /* set fifo interrupt threshold to 1 */ | |
381 | val |= KBC_CONTROL_FIFO_CNT_INT_EN; /* interrupt on FIFO threshold */ | |
382 | val |= KBC_CONTROL_KBC_EN; /* enable */ | |
383 | writel(val, kbc->mmio + KBC_CONTROL_0); | |
384 | ||
385 | /* | |
386 | * Compute the delay(ns) from interrupt mode to continuous polling | |
387 | * mode so the timer routine is scheduled appropriately. | |
388 | */ | |
389 | val = readl(kbc->mmio + KBC_INIT_DLY_0); | |
390 | kbc->cp_dly_jiffies = usecs_to_jiffies((val & 0xfffff) * 32); | |
391 | ||
392 | kbc->num_pressed_keys = 0; | |
393 | ||
394 | /* | |
395 | * Atomically clear out any remaining entries in the key FIFO | |
396 | * and enable keyboard interrupts. | |
397 | */ | |
11f5b30d RI |
398 | while (1) { |
399 | val = readl(kbc->mmio + KBC_INT_0); | |
400 | val >>= 4; | |
401 | if (!val) | |
402 | break; | |
403 | ||
404 | val = readl(kbc->mmio + KBC_KP_ENT0_0); | |
405 | val = readl(kbc->mmio + KBC_KP_ENT1_0); | |
406 | } | |
407 | writel(0x7, kbc->mmio + KBC_INT_0); | |
11f5b30d RI |
408 | |
409 | enable_irq(kbc->irq); | |
410 | ||
411 | return 0; | |
412 | } | |
413 | ||
414 | static void tegra_kbc_stop(struct tegra_kbc *kbc) | |
415 | { | |
416 | unsigned long flags; | |
417 | u32 val; | |
418 | ||
419 | spin_lock_irqsave(&kbc->lock, flags); | |
420 | val = readl(kbc->mmio + KBC_CONTROL_0); | |
421 | val &= ~1; | |
422 | writel(val, kbc->mmio + KBC_CONTROL_0); | |
423 | spin_unlock_irqrestore(&kbc->lock, flags); | |
424 | ||
425 | disable_irq(kbc->irq); | |
426 | del_timer_sync(&kbc->timer); | |
427 | ||
f762470b | 428 | clk_disable_unprepare(kbc->clk); |
11f5b30d RI |
429 | } |
430 | ||
431 | static int tegra_kbc_open(struct input_dev *dev) | |
432 | { | |
433 | struct tegra_kbc *kbc = input_get_drvdata(dev); | |
434 | ||
435 | return tegra_kbc_start(kbc); | |
436 | } | |
437 | ||
438 | static void tegra_kbc_close(struct input_dev *dev) | |
439 | { | |
440 | struct tegra_kbc *kbc = input_get_drvdata(dev); | |
441 | ||
442 | return tegra_kbc_stop(kbc); | |
443 | } | |
444 | ||
9eee07d3 SW |
445 | static bool tegra_kbc_check_pin_cfg(const struct tegra_kbc *kbc, |
446 | unsigned int *num_rows) | |
11f5b30d RI |
447 | { |
448 | int i; | |
449 | ||
450 | *num_rows = 0; | |
451 | ||
452 | for (i = 0; i < KBC_MAX_GPIO; i++) { | |
9eee07d3 | 453 | const struct tegra_kbc_pin_cfg *pin_cfg = &kbc->pin_cfg[i]; |
11f5b30d | 454 | |
023cea0e SR |
455 | switch (pin_cfg->type) { |
456 | case PIN_CFG_ROW: | |
e10af9e7 | 457 | if (pin_cfg->num >= kbc->hw_support->max_rows) { |
9eee07d3 | 458 | dev_err(kbc->dev, |
11f5b30d RI |
459 | "pin_cfg[%d]: invalid row number %d\n", |
460 | i, pin_cfg->num); | |
461 | return false; | |
462 | } | |
463 | (*num_rows)++; | |
023cea0e SR |
464 | break; |
465 | ||
466 | case PIN_CFG_COL: | |
e10af9e7 | 467 | if (pin_cfg->num >= kbc->hw_support->max_columns) { |
9eee07d3 | 468 | dev_err(kbc->dev, |
11f5b30d RI |
469 | "pin_cfg[%d]: invalid column number %d\n", |
470 | i, pin_cfg->num); | |
471 | return false; | |
472 | } | |
023cea0e SR |
473 | break; |
474 | ||
475 | case PIN_CFG_IGNORE: | |
476 | break; | |
477 | ||
478 | default: | |
9eee07d3 | 479 | dev_err(kbc->dev, |
023cea0e SR |
480 | "pin_cfg[%d]: invalid entry type %d\n", |
481 | pin_cfg->type, pin_cfg->num); | |
482 | return false; | |
11f5b30d RI |
483 | } |
484 | } | |
485 | ||
486 | return true; | |
487 | } | |
488 | ||
9eee07d3 | 489 | static int tegra_kbc_parse_dt(struct tegra_kbc *kbc) |
a445c7f0 | 490 | { |
9eee07d3 | 491 | struct device_node *np = kbc->dev->of_node; |
145e9734 OJ |
492 | u32 prop; |
493 | int i; | |
88390243 LD |
494 | u32 num_rows = 0; |
495 | u32 num_cols = 0; | |
496 | u32 cols_cfg[KBC_MAX_GPIO]; | |
497 | u32 rows_cfg[KBC_MAX_GPIO]; | |
498 | int proplen; | |
499 | int ret; | |
500 | ||
145e9734 | 501 | if (!of_property_read_u32(np, "nvidia,debounce-delay-ms", &prop)) |
9eee07d3 | 502 | kbc->debounce_cnt = prop; |
a445c7f0 | 503 | |
145e9734 | 504 | if (!of_property_read_u32(np, "nvidia,repeat-delay-ms", &prop)) |
9eee07d3 | 505 | kbc->repeat_cnt = prop; |
a445c7f0 | 506 | |
12c7d0ae | 507 | kbc->use_ghost_filter = of_property_present(np, "nvidia,needs-ghost-filter"); |
a445c7f0 | 508 | |
b42a1148 SH |
509 | if (of_property_read_bool(np, "wakeup-source") || |
510 | of_property_read_bool(np, "nvidia,wakeup-source")) /* legacy */ | |
9eee07d3 | 511 | kbc->wakeup = true; |
a445c7f0 | 512 | |
88390243 | 513 | if (!of_get_property(np, "nvidia,kbc-row-pins", &proplen)) { |
9eee07d3 SW |
514 | dev_err(kbc->dev, "property nvidia,kbc-row-pins not found\n"); |
515 | return -ENOENT; | |
88390243 LD |
516 | } |
517 | num_rows = proplen / sizeof(u32); | |
518 | ||
519 | if (!of_get_property(np, "nvidia,kbc-col-pins", &proplen)) { | |
9eee07d3 SW |
520 | dev_err(kbc->dev, "property nvidia,kbc-col-pins not found\n"); |
521 | return -ENOENT; | |
88390243 LD |
522 | } |
523 | num_cols = proplen / sizeof(u32); | |
524 | ||
e10af9e7 LD |
525 | if (num_rows > kbc->hw_support->max_rows) { |
526 | dev_err(kbc->dev, | |
527 | "Number of rows is more than supported by hardware\n"); | |
528 | return -EINVAL; | |
529 | } | |
530 | ||
531 | if (num_cols > kbc->hw_support->max_columns) { | |
532 | dev_err(kbc->dev, | |
533 | "Number of cols is more than supported by hardware\n"); | |
534 | return -EINVAL; | |
535 | } | |
536 | ||
88390243 | 537 | if (!of_get_property(np, "linux,keymap", &proplen)) { |
9eee07d3 SW |
538 | dev_err(kbc->dev, "property linux,keymap not found\n"); |
539 | return -ENOENT; | |
a445c7f0 OJ |
540 | } |
541 | ||
88390243 | 542 | if (!num_rows || !num_cols || ((num_rows + num_cols) > KBC_MAX_GPIO)) { |
9eee07d3 | 543 | dev_err(kbc->dev, |
660c5a6c | 544 | "keypad rows/columns not properly specified\n"); |
9eee07d3 | 545 | return -EINVAL; |
88390243 LD |
546 | } |
547 | ||
548 | /* Set all pins as non-configured */ | |
e10af9e7 | 549 | for (i = 0; i < kbc->num_rows_and_columns; i++) |
9eee07d3 | 550 | kbc->pin_cfg[i].type = PIN_CFG_IGNORE; |
88390243 LD |
551 | |
552 | ret = of_property_read_u32_array(np, "nvidia,kbc-row-pins", | |
553 | rows_cfg, num_rows); | |
554 | if (ret < 0) { | |
9eee07d3 SW |
555 | dev_err(kbc->dev, "Rows configurations are not proper\n"); |
556 | return -EINVAL; | |
88390243 LD |
557 | } |
558 | ||
559 | ret = of_property_read_u32_array(np, "nvidia,kbc-col-pins", | |
560 | cols_cfg, num_cols); | |
561 | if (ret < 0) { | |
9eee07d3 SW |
562 | dev_err(kbc->dev, "Cols configurations are not proper\n"); |
563 | return -EINVAL; | |
88390243 LD |
564 | } |
565 | ||
566 | for (i = 0; i < num_rows; i++) { | |
9eee07d3 SW |
567 | kbc->pin_cfg[rows_cfg[i]].type = PIN_CFG_ROW; |
568 | kbc->pin_cfg[rows_cfg[i]].num = i; | |
88390243 LD |
569 | } |
570 | ||
571 | for (i = 0; i < num_cols; i++) { | |
9eee07d3 SW |
572 | kbc->pin_cfg[cols_cfg[i]].type = PIN_CFG_COL; |
573 | kbc->pin_cfg[cols_cfg[i]].num = i; | |
a445c7f0 OJ |
574 | } |
575 | ||
9eee07d3 | 576 | return 0; |
a445c7f0 | 577 | } |
a445c7f0 | 578 | |
e10af9e7 LD |
579 | static const struct tegra_kbc_hw_support tegra20_kbc_hw_support = { |
580 | .max_rows = 16, | |
581 | .max_columns = 8, | |
582 | }; | |
583 | ||
584 | static const struct tegra_kbc_hw_support tegra11_kbc_hw_support = { | |
585 | .max_rows = 11, | |
586 | .max_columns = 8, | |
587 | }; | |
588 | ||
589 | static const struct of_device_id tegra_kbc_of_match[] = { | |
590 | { .compatible = "nvidia,tegra114-kbc", .data = &tegra11_kbc_hw_support}, | |
591 | { .compatible = "nvidia,tegra30-kbc", .data = &tegra20_kbc_hw_support}, | |
592 | { .compatible = "nvidia,tegra20-kbc", .data = &tegra20_kbc_hw_support}, | |
593 | { }, | |
594 | }; | |
595 | MODULE_DEVICE_TABLE(of, tegra_kbc_of_match); | |
596 | ||
5298cc4c | 597 | static int tegra_kbc_probe(struct platform_device *pdev) |
11f5b30d | 598 | { |
11f5b30d | 599 | struct tegra_kbc *kbc; |
11f5b30d | 600 | int err; |
11f5b30d RI |
601 | int num_rows = 0; |
602 | unsigned int debounce_cnt; | |
603 | unsigned int scan_time_rows; | |
e10af9e7 LD |
604 | unsigned int keymap_rows; |
605 | const struct of_device_id *match; | |
606 | ||
3cbd04f8 | 607 | match = of_match_device(tegra_kbc_of_match, &pdev->dev); |
11f5b30d | 608 | |
9eee07d3 SW |
609 | kbc = devm_kzalloc(&pdev->dev, sizeof(*kbc), GFP_KERNEL); |
610 | if (!kbc) { | |
611 | dev_err(&pdev->dev, "failed to alloc memory for kbc\n"); | |
612 | return -ENOMEM; | |
613 | } | |
614 | ||
615 | kbc->dev = &pdev->dev; | |
e10af9e7 LD |
616 | kbc->hw_support = match->data; |
617 | kbc->max_keys = kbc->hw_support->max_rows * | |
618 | kbc->hw_support->max_columns; | |
619 | kbc->num_rows_and_columns = kbc->hw_support->max_rows + | |
620 | kbc->hw_support->max_columns; | |
621 | keymap_rows = kbc->max_keys; | |
9eee07d3 | 622 | spin_lock_init(&kbc->lock); |
11f5b30d | 623 | |
9eee07d3 SW |
624 | err = tegra_kbc_parse_dt(kbc); |
625 | if (err) | |
626 | return err; | |
a445c7f0 | 627 | |
9eee07d3 | 628 | if (!tegra_kbc_check_pin_cfg(kbc, &num_rows)) |
00eb81e5 LD |
629 | return -EINVAL; |
630 | ||
9eee07d3 | 631 | kbc->irq = platform_get_irq(pdev, 0); |
0bec8b7e | 632 | if (kbc->irq < 0) |
00eb81e5 | 633 | return -ENXIO; |
11f5b30d | 634 | |
9eee07d3 SW |
635 | kbc->idev = devm_input_allocate_device(&pdev->dev); |
636 | if (!kbc->idev) { | |
00eb81e5 LD |
637 | dev_err(&pdev->dev, "failed to allocate input device\n"); |
638 | return -ENOMEM; | |
11f5b30d RI |
639 | } |
640 | ||
4ea40278 | 641 | timer_setup(&kbc->timer, tegra_kbc_keypress_timer, 0); |
11f5b30d | 642 | |
83ea7df6 | 643 | kbc->mmio = devm_platform_get_and_ioremap_resource(pdev, 0, NULL); |
ba52a7fc SK |
644 | if (IS_ERR(kbc->mmio)) |
645 | return PTR_ERR(kbc->mmio); | |
11f5b30d | 646 | |
00eb81e5 | 647 | kbc->clk = devm_clk_get(&pdev->dev, NULL); |
11f5b30d RI |
648 | if (IS_ERR(kbc->clk)) { |
649 | dev_err(&pdev->dev, "failed to get keyboard clock\n"); | |
00eb81e5 | 650 | return PTR_ERR(kbc->clk); |
11f5b30d RI |
651 | } |
652 | ||
fe6b0dfa SW |
653 | kbc->rst = devm_reset_control_get(&pdev->dev, "kbc"); |
654 | if (IS_ERR(kbc->rst)) { | |
655 | dev_err(&pdev->dev, "failed to get keyboard reset\n"); | |
656 | return PTR_ERR(kbc->rst); | |
657 | } | |
658 | ||
11f5b30d RI |
659 | /* |
660 | * The time delay between two consecutive reads of the FIFO is | |
661 | * the sum of the repeat time and the time taken for scanning | |
662 | * the rows. There is an additional delay before the row scanning | |
663 | * starts. The repoll delay is computed in milliseconds. | |
664 | */ | |
9eee07d3 | 665 | debounce_cnt = min(kbc->debounce_cnt, KBC_MAX_DEBOUNCE_CNT); |
11f5b30d | 666 | scan_time_rows = (KBC_ROW_SCAN_TIME + debounce_cnt) * num_rows; |
9eee07d3 | 667 | kbc->repoll_dly = KBC_ROW_SCAN_DLY + scan_time_rows + kbc->repeat_cnt; |
3f27757a | 668 | kbc->repoll_dly = DIV_ROUND_UP(kbc->repoll_dly, KBC_CYCLE_MS); |
11f5b30d | 669 | |
9eee07d3 SW |
670 | kbc->idev->name = pdev->name; |
671 | kbc->idev->id.bustype = BUS_HOST; | |
672 | kbc->idev->dev.parent = &pdev->dev; | |
673 | kbc->idev->open = tegra_kbc_open; | |
674 | kbc->idev->close = tegra_kbc_close; | |
11f5b30d | 675 | |
9eee07d3 | 676 | if (kbc->keymap_data && kbc->use_fn_map) |
914e5976 LD |
677 | keymap_rows *= 2; |
678 | ||
9eee07d3 | 679 | err = matrix_keypad_build_keymap(kbc->keymap_data, NULL, |
e10af9e7 LD |
680 | keymap_rows, |
681 | kbc->hw_support->max_columns, | |
9eee07d3 | 682 | kbc->keycode, kbc->idev); |
1932811f | 683 | if (err) { |
b45c8f35 | 684 | dev_err(&pdev->dev, "failed to setup keymap\n"); |
00eb81e5 | 685 | return err; |
1932811f DT |
686 | } |
687 | ||
9eee07d3 SW |
688 | __set_bit(EV_REP, kbc->idev->evbit); |
689 | input_set_capability(kbc->idev, EV_MSC, MSC_SCAN); | |
1932811f | 690 | |
9eee07d3 | 691 | input_set_drvdata(kbc->idev, kbc); |
11f5b30d | 692 | |
00eb81e5 | 693 | err = devm_request_irq(&pdev->dev, kbc->irq, tegra_kbc_isr, |
bcd9730a BS |
694 | IRQF_TRIGGER_HIGH | IRQF_NO_AUTOEN, |
695 | pdev->name, kbc); | |
11f5b30d RI |
696 | if (err) { |
697 | dev_err(&pdev->dev, "failed to request keyboard IRQ\n"); | |
00eb81e5 | 698 | return err; |
11f5b30d RI |
699 | } |
700 | ||
11f5b30d RI |
701 | err = input_register_device(kbc->idev); |
702 | if (err) { | |
703 | dev_err(&pdev->dev, "failed to register input device\n"); | |
00eb81e5 | 704 | return err; |
11f5b30d RI |
705 | } |
706 | ||
707 | platform_set_drvdata(pdev, kbc); | |
9eee07d3 | 708 | device_init_wakeup(&pdev->dev, kbc->wakeup); |
11f5b30d | 709 | |
11f5b30d RI |
710 | return 0; |
711 | } | |
712 | ||
1c407a1b LD |
713 | static void tegra_kbc_set_keypress_interrupt(struct tegra_kbc *kbc, bool enable) |
714 | { | |
715 | u32 val; | |
716 | ||
717 | val = readl(kbc->mmio + KBC_CONTROL_0); | |
718 | if (enable) | |
719 | val |= KBC_CONTROL_KEYPRESS_INT_EN; | |
720 | else | |
721 | val &= ~KBC_CONTROL_KEYPRESS_INT_EN; | |
722 | writel(val, kbc->mmio + KBC_CONTROL_0); | |
723 | } | |
724 | ||
11f5b30d RI |
725 | static int tegra_kbc_suspend(struct device *dev) |
726 | { | |
727 | struct platform_device *pdev = to_platform_device(dev); | |
728 | struct tegra_kbc *kbc = platform_get_drvdata(pdev); | |
729 | ||
d0d150ec | 730 | mutex_lock(&kbc->idev->mutex); |
11f5b30d | 731 | if (device_may_wakeup(&pdev->dev)) { |
d0d150ec RI |
732 | disable_irq(kbc->irq); |
733 | del_timer_sync(&kbc->timer); | |
734 | tegra_kbc_set_fifo_interrupt(kbc, false); | |
735 | ||
11f5b30d RI |
736 | /* Forcefully clear the interrupt status */ |
737 | writel(0x7, kbc->mmio + KBC_INT_0); | |
d0d150ec RI |
738 | /* |
739 | * Store the previous resident time of continuous polling mode. | |
740 | * Force the keyboard into interrupt mode. | |
741 | */ | |
742 | kbc->cp_to_wkup_dly = readl(kbc->mmio + KBC_TO_CNT_0); | |
743 | writel(0, kbc->mmio + KBC_TO_CNT_0); | |
744 | ||
745 | tegra_kbc_setup_wakekeys(kbc, true); | |
11f5b30d | 746 | msleep(30); |
d0d150ec | 747 | |
fd0fc213 | 748 | kbc->keypress_caused_wake = false; |
b6834b02 RI |
749 | /* Enable keypress interrupt before going into suspend. */ |
750 | tegra_kbc_set_keypress_interrupt(kbc, true); | |
fd0fc213 | 751 | enable_irq(kbc->irq); |
d0d150ec | 752 | enable_irq_wake(kbc->irq); |
11f5b30d | 753 | } else { |
d69f0a43 | 754 | if (input_device_enabled(kbc->idev)) |
11f5b30d | 755 | tegra_kbc_stop(kbc); |
11f5b30d | 756 | } |
d0d150ec | 757 | mutex_unlock(&kbc->idev->mutex); |
11f5b30d RI |
758 | |
759 | return 0; | |
760 | } | |
761 | ||
762 | static int tegra_kbc_resume(struct device *dev) | |
763 | { | |
764 | struct platform_device *pdev = to_platform_device(dev); | |
765 | struct tegra_kbc *kbc = platform_get_drvdata(pdev); | |
766 | int err = 0; | |
767 | ||
d0d150ec | 768 | mutex_lock(&kbc->idev->mutex); |
11f5b30d RI |
769 | if (device_may_wakeup(&pdev->dev)) { |
770 | disable_irq_wake(kbc->irq); | |
771 | tegra_kbc_setup_wakekeys(kbc, false); | |
b6834b02 RI |
772 | /* We will use fifo interrupts for key detection. */ |
773 | tegra_kbc_set_keypress_interrupt(kbc, false); | |
d0d150ec RI |
774 | |
775 | /* Restore the resident time of continuous polling mode. */ | |
776 | writel(kbc->cp_to_wkup_dly, kbc->mmio + KBC_TO_CNT_0); | |
777 | ||
778 | tegra_kbc_set_fifo_interrupt(kbc, true); | |
779 | ||
fd0fc213 RI |
780 | if (kbc->keypress_caused_wake && kbc->wakeup_key) { |
781 | /* | |
782 | * We can't report events directly from the ISR | |
783 | * because timekeeping is stopped when processing | |
784 | * wakeup request and we get a nasty warning when | |
785 | * we try to call do_gettimeofday() in evdev | |
786 | * handler. | |
787 | */ | |
788 | input_report_key(kbc->idev, kbc->wakeup_key, 1); | |
789 | input_sync(kbc->idev); | |
790 | input_report_key(kbc->idev, kbc->wakeup_key, 0); | |
791 | input_sync(kbc->idev); | |
792 | } | |
11f5b30d | 793 | } else { |
d69f0a43 | 794 | if (input_device_enabled(kbc->idev)) |
11f5b30d | 795 | err = tegra_kbc_start(kbc); |
11f5b30d | 796 | } |
d0d150ec | 797 | mutex_unlock(&kbc->idev->mutex); |
11f5b30d RI |
798 | |
799 | return err; | |
800 | } | |
11f5b30d | 801 | |
995765ed JC |
802 | static DEFINE_SIMPLE_DEV_PM_OPS(tegra_kbc_pm_ops, |
803 | tegra_kbc_suspend, tegra_kbc_resume); | |
11f5b30d RI |
804 | |
805 | static struct platform_driver tegra_kbc_driver = { | |
806 | .probe = tegra_kbc_probe, | |
11f5b30d RI |
807 | .driver = { |
808 | .name = "tegra-kbc", | |
995765ed | 809 | .pm = pm_sleep_ptr(&tegra_kbc_pm_ops), |
a445c7f0 | 810 | .of_match_table = tegra_kbc_of_match, |
11f5b30d RI |
811 | }, |
812 | }; | |
5146c84f | 813 | module_platform_driver(tegra_kbc_driver); |
11f5b30d RI |
814 | |
815 | MODULE_LICENSE("GPL"); | |
816 | MODULE_AUTHOR("Rakesh Iyer <riyer@nvidia.com>"); | |
817 | MODULE_DESCRIPTION("Tegra matrix keyboard controller driver"); | |
818 | MODULE_ALIAS("platform:tegra-kbc"); |