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