1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Keyboard class input driver for the NVIDIA Tegra SoC internal matrix 4 * keyboard controller 5 * 6 * Copyright (c) 2009-2011, NVIDIA Corporation. 7 */ 8 9 #include <linux/kernel.h> 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> 16 #include <linux/of.h> 17 #include <linux/of_device.h> 18 #include <linux/clk.h> 19 #include <linux/slab.h> 20 #include <linux/input/matrix_keypad.h> 21 #include <linux/reset.h> 22 #include <linux/err.h> 23 24 #define KBC_MAX_KPENT 8 25 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) 30 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 */ 38 #define KBC_CYCLE_MS 32 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) 47 #define KBC_CONTROL_KEYPRESS_INT_EN (1 << 1) 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) 53 #define KBC_INT_KEYPRESS_INT_STATUS (1 << 0) 54 55 #define KBC_ROW_CFG0_0 0x8 56 #define KBC_COL_CFG0_0 0x18 57 #define KBC_TO_CNT_0 0x24 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 66 enum tegra_pin_type { 67 PIN_CFG_IGNORE, 68 PIN_CFG_COL, 69 PIN_CFG_ROW, 70 }; 71 72 /* Tegra KBC hw support */ 73 struct tegra_kbc_hw_support { 74 int max_rows; 75 int max_columns; 76 }; 77 78 struct tegra_kbc_pin_cfg { 79 enum tegra_pin_type type; 80 unsigned char num; 81 }; 82 83 struct tegra_kbc { 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; 90 void __iomem *mmio; 91 struct input_dev *idev; 92 int irq; 93 spinlock_t lock; 94 unsigned int repoll_dly; 95 unsigned long cp_dly_jiffies; 96 unsigned int cp_to_wkup_dly; 97 bool use_fn_map; 98 bool use_ghost_filter; 99 bool keypress_caused_wake; 100 unsigned short keycode[KBC_MAX_KEY * 2]; 101 unsigned short current_keys[KBC_MAX_KPENT]; 102 unsigned int num_pressed_keys; 103 u32 wakeup_key; 104 struct timer_list timer; 105 struct clk *clk; 106 struct reset_control *rst; 107 const struct tegra_kbc_hw_support *hw_support; 108 int max_keys; 109 int num_rows_and_columns; 110 }; 111 112 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; 150 bool fn_keypress = false; 151 bool key_in_same_row = false; 152 bool key_in_same_col = false; 153 154 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; 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++; 171 } 172 173 val >>= 8; 174 } 175 176 /* 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 */ 182 if (kbc->use_ghost_filter && num_down >= 3) { 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 } 203 204 /* 205 * If the platform uses Fn keymaps, translate keys on a Fn keypress. 206 * Function keycodes are max_keys apart from the plain keycodes. 207 */ 208 if (fn_keypress) { 209 for (i = 0; i < num_down; i++) { 210 scancodes[i] += kbc->max_keys; 211 keycodes[i] = kbc->keycode[scancodes[i]]; 212 } 213 } 214 215 /* Ignore the key presses for this iteration? */ 216 if (key_in_same_col && key_in_same_row) 217 return; 218 219 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 } 228 229 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 } 240 241 static void tegra_kbc_keypress_timer(struct timer_list *t) 242 { 243 struct tegra_kbc *kbc = from_timer(kbc, t, timer); 244 unsigned long flags; 245 u32 val; 246 unsigned int i; 247 248 spin_lock_irqsave(&kbc->lock, flags); 249 250 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 */ 271 tegra_kbc_set_fifo_interrupt(kbc, true); 272 } 273 274 spin_unlock_irqrestore(&kbc->lock, flags); 275 } 276 277 static irqreturn_t tegra_kbc_isr(int irq, void *args) 278 { 279 struct tegra_kbc *kbc = args; 280 unsigned long flags; 281 u32 val; 282 283 spin_lock_irqsave(&kbc->lock, flags); 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 /* 294 * Until all keys are released, defer further processing to 295 * the polling loop in tegra_kbc_keypress_timer. 296 */ 297 tegra_kbc_set_fifo_interrupt(kbc, false); 298 mod_timer(&kbc->timer, jiffies + kbc->cp_dly_jiffies); 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; 302 } 303 304 spin_unlock_irqrestore(&kbc->lock, flags); 305 306 return IRQ_HANDLED; 307 } 308 309 static void tegra_kbc_setup_wakekeys(struct tegra_kbc *kbc, bool filter) 310 { 311 int i; 312 unsigned int rst_val; 313 314 /* Either mask all keys or none. */ 315 rst_val = (filter && !kbc->wakeup) ? ~0 : 0; 316 317 for (i = 0; i < kbc->hw_support->max_rows; i++) 318 writel(rst_val, kbc->mmio + KBC_ROW0_MASK_0 + i * 4); 319 } 320 321 static void tegra_kbc_config_pins(struct tegra_kbc *kbc) 322 { 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); 328 u32 r_mask = 0x1f << r_shft; 329 u32 c_mask = 0x0f << c_shft; 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; 337 338 switch (kbc->pin_cfg[i].type) { 339 case PIN_CFG_ROW: 340 row_cfg |= ((kbc->pin_cfg[i].num << 1) | 1) << r_shft; 341 break; 342 343 case PIN_CFG_COL: 344 col_cfg |= ((kbc->pin_cfg[i].num << 1) | 1) << c_shft; 345 break; 346 347 case PIN_CFG_IGNORE: 348 break; 349 } 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 { 358 unsigned int debounce_cnt; 359 u32 val = 0; 360 int ret; 361 362 ret = clk_prepare_enable(kbc->clk); 363 if (ret) 364 return ret; 365 366 /* Reset the KBC controller to clear all previous status.*/ 367 reset_control_assert(kbc->rst); 368 udelay(100); 369 reset_control_deassert(kbc->rst); 370 udelay(100); 371 372 tegra_kbc_config_pins(kbc); 373 tegra_kbc_setup_wakekeys(kbc, false); 374 375 writel(kbc->repeat_cnt, kbc->mmio + KBC_RPT_DLY_0); 376 377 /* Keyboard debounce count is maximum of 12 bits. */ 378 debounce_cnt = min(kbc->debounce_cnt, KBC_MAX_DEBOUNCE_CNT); 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 */ 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); 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); 427 428 clk_disable_unprepare(kbc->clk); 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 } 444 445 static bool tegra_kbc_check_pin_cfg(const struct tegra_kbc *kbc, 446 unsigned int *num_rows) 447 { 448 int i; 449 450 *num_rows = 0; 451 452 for (i = 0; i < KBC_MAX_GPIO; i++) { 453 const struct tegra_kbc_pin_cfg *pin_cfg = &kbc->pin_cfg[i]; 454 455 switch (pin_cfg->type) { 456 case PIN_CFG_ROW: 457 if (pin_cfg->num >= kbc->hw_support->max_rows) { 458 dev_err(kbc->dev, 459 "pin_cfg[%d]: invalid row number %d\n", 460 i, pin_cfg->num); 461 return false; 462 } 463 (*num_rows)++; 464 break; 465 466 case PIN_CFG_COL: 467 if (pin_cfg->num >= kbc->hw_support->max_columns) { 468 dev_err(kbc->dev, 469 "pin_cfg[%d]: invalid column number %d\n", 470 i, pin_cfg->num); 471 return false; 472 } 473 break; 474 475 case PIN_CFG_IGNORE: 476 break; 477 478 default: 479 dev_err(kbc->dev, 480 "pin_cfg[%d]: invalid entry type %d\n", 481 pin_cfg->type, pin_cfg->num); 482 return false; 483 } 484 } 485 486 return true; 487 } 488 489 static int tegra_kbc_parse_dt(struct tegra_kbc *kbc) 490 { 491 struct device_node *np = kbc->dev->of_node; 492 u32 prop; 493 int i; 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; 500 501 if (!of_property_read_u32(np, "nvidia,debounce-delay-ms", &prop)) 502 kbc->debounce_cnt = prop; 503 504 if (!of_property_read_u32(np, "nvidia,repeat-delay-ms", &prop)) 505 kbc->repeat_cnt = prop; 506 507 if (of_find_property(np, "nvidia,needs-ghost-filter", NULL)) 508 kbc->use_ghost_filter = true; 509 510 if (of_property_read_bool(np, "wakeup-source") || 511 of_property_read_bool(np, "nvidia,wakeup-source")) /* legacy */ 512 kbc->wakeup = true; 513 514 if (!of_get_property(np, "nvidia,kbc-row-pins", &proplen)) { 515 dev_err(kbc->dev, "property nvidia,kbc-row-pins not found\n"); 516 return -ENOENT; 517 } 518 num_rows = proplen / sizeof(u32); 519 520 if (!of_get_property(np, "nvidia,kbc-col-pins", &proplen)) { 521 dev_err(kbc->dev, "property nvidia,kbc-col-pins not found\n"); 522 return -ENOENT; 523 } 524 num_cols = proplen / sizeof(u32); 525 526 if (num_rows > kbc->hw_support->max_rows) { 527 dev_err(kbc->dev, 528 "Number of rows is more than supported by hardware\n"); 529 return -EINVAL; 530 } 531 532 if (num_cols > kbc->hw_support->max_columns) { 533 dev_err(kbc->dev, 534 "Number of cols is more than supported by hardware\n"); 535 return -EINVAL; 536 } 537 538 if (!of_get_property(np, "linux,keymap", &proplen)) { 539 dev_err(kbc->dev, "property linux,keymap not found\n"); 540 return -ENOENT; 541 } 542 543 if (!num_rows || !num_cols || ((num_rows + num_cols) > KBC_MAX_GPIO)) { 544 dev_err(kbc->dev, 545 "keypad rows/columns not properly specified\n"); 546 return -EINVAL; 547 } 548 549 /* Set all pins as non-configured */ 550 for (i = 0; i < kbc->num_rows_and_columns; i++) 551 kbc->pin_cfg[i].type = PIN_CFG_IGNORE; 552 553 ret = of_property_read_u32_array(np, "nvidia,kbc-row-pins", 554 rows_cfg, num_rows); 555 if (ret < 0) { 556 dev_err(kbc->dev, "Rows configurations are not proper\n"); 557 return -EINVAL; 558 } 559 560 ret = of_property_read_u32_array(np, "nvidia,kbc-col-pins", 561 cols_cfg, num_cols); 562 if (ret < 0) { 563 dev_err(kbc->dev, "Cols configurations are not proper\n"); 564 return -EINVAL; 565 } 566 567 for (i = 0; i < num_rows; i++) { 568 kbc->pin_cfg[rows_cfg[i]].type = PIN_CFG_ROW; 569 kbc->pin_cfg[rows_cfg[i]].num = i; 570 } 571 572 for (i = 0; i < num_cols; i++) { 573 kbc->pin_cfg[cols_cfg[i]].type = PIN_CFG_COL; 574 kbc->pin_cfg[cols_cfg[i]].num = i; 575 } 576 577 return 0; 578 } 579 580 static const struct tegra_kbc_hw_support tegra20_kbc_hw_support = { 581 .max_rows = 16, 582 .max_columns = 8, 583 }; 584 585 static const struct tegra_kbc_hw_support tegra11_kbc_hw_support = { 586 .max_rows = 11, 587 .max_columns = 8, 588 }; 589 590 static const struct of_device_id tegra_kbc_of_match[] = { 591 { .compatible = "nvidia,tegra114-kbc", .data = &tegra11_kbc_hw_support}, 592 { .compatible = "nvidia,tegra30-kbc", .data = &tegra20_kbc_hw_support}, 593 { .compatible = "nvidia,tegra20-kbc", .data = &tegra20_kbc_hw_support}, 594 { }, 595 }; 596 MODULE_DEVICE_TABLE(of, tegra_kbc_of_match); 597 598 static int tegra_kbc_probe(struct platform_device *pdev) 599 { 600 struct tegra_kbc *kbc; 601 struct resource *res; 602 int err; 603 int num_rows = 0; 604 unsigned int debounce_cnt; 605 unsigned int scan_time_rows; 606 unsigned int keymap_rows; 607 const struct of_device_id *match; 608 609 match = of_match_device(tegra_kbc_of_match, &pdev->dev); 610 611 kbc = devm_kzalloc(&pdev->dev, sizeof(*kbc), GFP_KERNEL); 612 if (!kbc) { 613 dev_err(&pdev->dev, "failed to alloc memory for kbc\n"); 614 return -ENOMEM; 615 } 616 617 kbc->dev = &pdev->dev; 618 kbc->hw_support = match->data; 619 kbc->max_keys = kbc->hw_support->max_rows * 620 kbc->hw_support->max_columns; 621 kbc->num_rows_and_columns = kbc->hw_support->max_rows + 622 kbc->hw_support->max_columns; 623 keymap_rows = kbc->max_keys; 624 spin_lock_init(&kbc->lock); 625 626 err = tegra_kbc_parse_dt(kbc); 627 if (err) 628 return err; 629 630 if (!tegra_kbc_check_pin_cfg(kbc, &num_rows)) 631 return -EINVAL; 632 633 kbc->irq = platform_get_irq(pdev, 0); 634 if (kbc->irq < 0) 635 return -ENXIO; 636 637 kbc->idev = devm_input_allocate_device(&pdev->dev); 638 if (!kbc->idev) { 639 dev_err(&pdev->dev, "failed to allocate input device\n"); 640 return -ENOMEM; 641 } 642 643 timer_setup(&kbc->timer, tegra_kbc_keypress_timer, 0); 644 645 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 646 kbc->mmio = devm_ioremap_resource(&pdev->dev, res); 647 if (IS_ERR(kbc->mmio)) 648 return PTR_ERR(kbc->mmio); 649 650 kbc->clk = devm_clk_get(&pdev->dev, NULL); 651 if (IS_ERR(kbc->clk)) { 652 dev_err(&pdev->dev, "failed to get keyboard clock\n"); 653 return PTR_ERR(kbc->clk); 654 } 655 656 kbc->rst = devm_reset_control_get(&pdev->dev, "kbc"); 657 if (IS_ERR(kbc->rst)) { 658 dev_err(&pdev->dev, "failed to get keyboard reset\n"); 659 return PTR_ERR(kbc->rst); 660 } 661 662 /* 663 * The time delay between two consecutive reads of the FIFO is 664 * the sum of the repeat time and the time taken for scanning 665 * the rows. There is an additional delay before the row scanning 666 * starts. The repoll delay is computed in milliseconds. 667 */ 668 debounce_cnt = min(kbc->debounce_cnt, KBC_MAX_DEBOUNCE_CNT); 669 scan_time_rows = (KBC_ROW_SCAN_TIME + debounce_cnt) * num_rows; 670 kbc->repoll_dly = KBC_ROW_SCAN_DLY + scan_time_rows + kbc->repeat_cnt; 671 kbc->repoll_dly = DIV_ROUND_UP(kbc->repoll_dly, KBC_CYCLE_MS); 672 673 kbc->idev->name = pdev->name; 674 kbc->idev->id.bustype = BUS_HOST; 675 kbc->idev->dev.parent = &pdev->dev; 676 kbc->idev->open = tegra_kbc_open; 677 kbc->idev->close = tegra_kbc_close; 678 679 if (kbc->keymap_data && kbc->use_fn_map) 680 keymap_rows *= 2; 681 682 err = matrix_keypad_build_keymap(kbc->keymap_data, NULL, 683 keymap_rows, 684 kbc->hw_support->max_columns, 685 kbc->keycode, kbc->idev); 686 if (err) { 687 dev_err(&pdev->dev, "failed to setup keymap\n"); 688 return err; 689 } 690 691 __set_bit(EV_REP, kbc->idev->evbit); 692 input_set_capability(kbc->idev, EV_MSC, MSC_SCAN); 693 694 input_set_drvdata(kbc->idev, kbc); 695 696 err = devm_request_irq(&pdev->dev, kbc->irq, tegra_kbc_isr, 697 IRQF_TRIGGER_HIGH, pdev->name, kbc); 698 if (err) { 699 dev_err(&pdev->dev, "failed to request keyboard IRQ\n"); 700 return err; 701 } 702 703 disable_irq(kbc->irq); 704 705 err = input_register_device(kbc->idev); 706 if (err) { 707 dev_err(&pdev->dev, "failed to register input device\n"); 708 return err; 709 } 710 711 platform_set_drvdata(pdev, kbc); 712 device_init_wakeup(&pdev->dev, kbc->wakeup); 713 714 return 0; 715 } 716 717 #ifdef CONFIG_PM_SLEEP 718 static void tegra_kbc_set_keypress_interrupt(struct tegra_kbc *kbc, bool enable) 719 { 720 u32 val; 721 722 val = readl(kbc->mmio + KBC_CONTROL_0); 723 if (enable) 724 val |= KBC_CONTROL_KEYPRESS_INT_EN; 725 else 726 val &= ~KBC_CONTROL_KEYPRESS_INT_EN; 727 writel(val, kbc->mmio + KBC_CONTROL_0); 728 } 729 730 static int tegra_kbc_suspend(struct device *dev) 731 { 732 struct platform_device *pdev = to_platform_device(dev); 733 struct tegra_kbc *kbc = platform_get_drvdata(pdev); 734 735 mutex_lock(&kbc->idev->mutex); 736 if (device_may_wakeup(&pdev->dev)) { 737 disable_irq(kbc->irq); 738 del_timer_sync(&kbc->timer); 739 tegra_kbc_set_fifo_interrupt(kbc, false); 740 741 /* Forcefully clear the interrupt status */ 742 writel(0x7, kbc->mmio + KBC_INT_0); 743 /* 744 * Store the previous resident time of continuous polling mode. 745 * Force the keyboard into interrupt mode. 746 */ 747 kbc->cp_to_wkup_dly = readl(kbc->mmio + KBC_TO_CNT_0); 748 writel(0, kbc->mmio + KBC_TO_CNT_0); 749 750 tegra_kbc_setup_wakekeys(kbc, true); 751 msleep(30); 752 753 kbc->keypress_caused_wake = false; 754 /* Enable keypress interrupt before going into suspend. */ 755 tegra_kbc_set_keypress_interrupt(kbc, true); 756 enable_irq(kbc->irq); 757 enable_irq_wake(kbc->irq); 758 } else { 759 if (kbc->idev->users) 760 tegra_kbc_stop(kbc); 761 } 762 mutex_unlock(&kbc->idev->mutex); 763 764 return 0; 765 } 766 767 static int tegra_kbc_resume(struct device *dev) 768 { 769 struct platform_device *pdev = to_platform_device(dev); 770 struct tegra_kbc *kbc = platform_get_drvdata(pdev); 771 int err = 0; 772 773 mutex_lock(&kbc->idev->mutex); 774 if (device_may_wakeup(&pdev->dev)) { 775 disable_irq_wake(kbc->irq); 776 tegra_kbc_setup_wakekeys(kbc, false); 777 /* We will use fifo interrupts for key detection. */ 778 tegra_kbc_set_keypress_interrupt(kbc, false); 779 780 /* Restore the resident time of continuous polling mode. */ 781 writel(kbc->cp_to_wkup_dly, kbc->mmio + KBC_TO_CNT_0); 782 783 tegra_kbc_set_fifo_interrupt(kbc, true); 784 785 if (kbc->keypress_caused_wake && kbc->wakeup_key) { 786 /* 787 * We can't report events directly from the ISR 788 * because timekeeping is stopped when processing 789 * wakeup request and we get a nasty warning when 790 * we try to call do_gettimeofday() in evdev 791 * handler. 792 */ 793 input_report_key(kbc->idev, kbc->wakeup_key, 1); 794 input_sync(kbc->idev); 795 input_report_key(kbc->idev, kbc->wakeup_key, 0); 796 input_sync(kbc->idev); 797 } 798 } else { 799 if (kbc->idev->users) 800 err = tegra_kbc_start(kbc); 801 } 802 mutex_unlock(&kbc->idev->mutex); 803 804 return err; 805 } 806 #endif 807 808 static SIMPLE_DEV_PM_OPS(tegra_kbc_pm_ops, tegra_kbc_suspend, tegra_kbc_resume); 809 810 static struct platform_driver tegra_kbc_driver = { 811 .probe = tegra_kbc_probe, 812 .driver = { 813 .name = "tegra-kbc", 814 .pm = &tegra_kbc_pm_ops, 815 .of_match_table = tegra_kbc_of_match, 816 }, 817 }; 818 module_platform_driver(tegra_kbc_driver); 819 820 MODULE_LICENSE("GPL"); 821 MODULE_AUTHOR("Rakesh Iyer <riyer@nvidia.com>"); 822 MODULE_DESCRIPTION("Tegra matrix keyboard controller driver"); 823 MODULE_ALIAS("platform:tegra-kbc"); 824