1 /* 2 * Keyboard class input driver for the NVIDIA Tegra SoC internal matrix 3 * keyboard controller 4 * 5 * Copyright (c) 2009-2011, NVIDIA Corporation. 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, but WITHOUT 13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 15 * more details. 16 * 17 * You should have received a copy of the GNU General Public License along 18 * with this program; if not, write to the Free Software Foundation, Inc., 19 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. 20 */ 21 22 #include <linux/kernel.h> 23 #include <linux/module.h> 24 #include <linux/input.h> 25 #include <linux/platform_device.h> 26 #include <linux/delay.h> 27 #include <linux/io.h> 28 #include <linux/interrupt.h> 29 #include <linux/of.h> 30 #include <linux/clk.h> 31 #include <linux/slab.h> 32 #include <mach/clk.h> 33 #include <mach/kbc.h> 34 35 #define KBC_MAX_DEBOUNCE_CNT 0x3ffu 36 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 40 41 /* KBC uses a 32KHz clock so a cycle = 1/32Khz */ 42 #define KBC_CYCLE_MS 32 43 44 /* KBC Registers */ 45 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) 53 54 /* KBC Interrupt Register */ 55 #define KBC_INT_0 0x4 56 #define KBC_INT_FIFO_CNT_INT_STATUS (1 << 2) 57 #define KBC_INT_KEYPRESS_INT_STATUS (1 << 0) 58 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 67 68 #define KBC_ROW_SHIFT 3 69 70 struct tegra_kbc { 71 void __iomem *mmio; 72 struct input_dev *idev; 73 unsigned int irq; 74 spinlock_t lock; 75 unsigned int repoll_dly; 76 unsigned long cp_dly_jiffies; 77 unsigned int cp_to_wkup_dly; 78 bool use_fn_map; 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; 85 u32 wakeup_key; 86 struct timer_list timer; 87 struct clk *clk; 88 }; 89 90 static const u32 tegra_kbc_default_keymap[] __devinitdata = { 91 KEY(0, 2, KEY_W), 92 KEY(0, 3, KEY_S), 93 KEY(0, 4, KEY_A), 94 KEY(0, 5, KEY_Z), 95 KEY(0, 7, KEY_FN), 96 97 KEY(1, 7, KEY_LEFTMETA), 98 99 KEY(2, 6, KEY_RIGHTALT), 100 KEY(2, 7, KEY_LEFTALT), 101 102 KEY(3, 0, KEY_5), 103 KEY(3, 1, KEY_4), 104 KEY(3, 2, KEY_R), 105 KEY(3, 3, KEY_E), 106 KEY(3, 4, KEY_F), 107 KEY(3, 5, KEY_D), 108 KEY(3, 6, KEY_X), 109 110 KEY(4, 0, KEY_7), 111 KEY(4, 1, KEY_6), 112 KEY(4, 2, KEY_T), 113 KEY(4, 3, KEY_H), 114 KEY(4, 4, KEY_G), 115 KEY(4, 5, KEY_V), 116 KEY(4, 6, KEY_C), 117 KEY(4, 7, KEY_SPACE), 118 119 KEY(5, 0, KEY_9), 120 KEY(5, 1, KEY_8), 121 KEY(5, 2, KEY_U), 122 KEY(5, 3, KEY_Y), 123 KEY(5, 4, KEY_J), 124 KEY(5, 5, KEY_N), 125 KEY(5, 6, KEY_B), 126 KEY(5, 7, KEY_BACKSLASH), 127 128 KEY(6, 0, KEY_MINUS), 129 KEY(6, 1, KEY_0), 130 KEY(6, 2, KEY_O), 131 KEY(6, 3, KEY_I), 132 KEY(6, 4, KEY_L), 133 KEY(6, 5, KEY_K), 134 KEY(6, 6, KEY_COMMA), 135 KEY(6, 7, KEY_M), 136 137 KEY(7, 1, KEY_EQUAL), 138 KEY(7, 2, KEY_RIGHTBRACE), 139 KEY(7, 3, KEY_ENTER), 140 KEY(7, 7, KEY_MENU), 141 142 KEY(8, 4, KEY_RIGHTSHIFT), 143 KEY(8, 5, KEY_LEFTSHIFT), 144 145 KEY(9, 5, KEY_RIGHTCTRL), 146 KEY(9, 7, KEY_LEFTCTRL), 147 148 KEY(11, 0, KEY_LEFTBRACE), 149 KEY(11, 1, KEY_P), 150 KEY(11, 2, KEY_APOSTROPHE), 151 KEY(11, 3, KEY_SEMICOLON), 152 KEY(11, 4, KEY_SLASH), 153 KEY(11, 5, KEY_DOT), 154 155 KEY(12, 0, KEY_F10), 156 KEY(12, 1, KEY_F9), 157 KEY(12, 2, KEY_BACKSPACE), 158 KEY(12, 3, KEY_3), 159 KEY(12, 4, KEY_2), 160 KEY(12, 5, KEY_UP), 161 KEY(12, 6, KEY_PRINT), 162 KEY(12, 7, KEY_PAUSE), 163 164 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), 171 172 KEY(14, 0, KEY_F11), 173 KEY(14, 1, KEY_F12), 174 KEY(14, 2, KEY_F8), 175 KEY(14, 3, KEY_Q), 176 KEY(14, 4, KEY_F4), 177 KEY(14, 5, KEY_F3), 178 KEY(14, 6, KEY_1), 179 KEY(14, 7, KEY_F7), 180 181 KEY(15, 0, KEY_ESC), 182 KEY(15, 1, KEY_GRAVE), 183 KEY(15, 2, KEY_F5), 184 KEY(15, 3, KEY_TAB), 185 KEY(15, 4, KEY_F1), 186 KEY(15, 5, KEY_F2), 187 KEY(15, 6, KEY_CAPSLOCK), 188 KEY(15, 7, KEY_F6), 189 190 /* Software Handled Function Keys */ 191 KEY(20, 0, KEY_KP7), 192 193 KEY(21, 0, KEY_KP9), 194 KEY(21, 1, KEY_KP8), 195 KEY(21, 2, KEY_KP4), 196 KEY(21, 4, KEY_KP1), 197 198 KEY(22, 1, KEY_KPSLASH), 199 KEY(22, 2, KEY_KP6), 200 KEY(22, 3, KEY_KP5), 201 KEY(22, 4, KEY_KP3), 202 KEY(22, 5, KEY_KP2), 203 KEY(22, 7, KEY_KP0), 204 205 KEY(27, 1, KEY_KPASTERISK), 206 KEY(27, 3, KEY_KPMINUS), 207 KEY(27, 4, KEY_KPPLUS), 208 KEY(27, 5, KEY_KPDOT), 209 210 KEY(28, 5, KEY_VOLUMEUP), 211 212 KEY(29, 3, KEY_HOME), 213 KEY(29, 4, KEY_END), 214 KEY(29, 5, KEY_BRIGHTNESSDOWN), 215 KEY(29, 6, KEY_VOLUMEDOWN), 216 KEY(29, 7, KEY_BRIGHTNESSUP), 217 218 KEY(30, 0, KEY_NUMLOCK), 219 KEY(30, 1, KEY_SCROLLLOCK), 220 KEY(30, 2, KEY_MUTE), 221 222 KEY(31, 4, KEY_HELP), 223 }; 224 225 static const 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), 229 }; 230 231 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) 236 { 237 unsigned int i, j; 238 239 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]) 242 break; 243 244 if (j == new_num_keys) 245 input_report_key(input, old_keycodes[i], 0); 246 } 247 } 248 249 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) 253 { 254 unsigned int i; 255 256 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); 259 } 260 } 261 262 static void tegra_kbc_report_keys(struct tegra_kbc *kbc) 263 { 264 unsigned char scancodes[KBC_MAX_KPENT]; 265 unsigned short keycodes[KBC_MAX_KPENT]; 266 u32 val = 0; 267 unsigned int i; 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; 272 273 for (i = 0; i < KBC_MAX_KPENT; i++) { 274 if ((i % 4) == 0) 275 val = readl(kbc->mmio + KBC_KP_ENT0_0 + i); 276 277 if (val & 0x80) { 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); 282 283 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) 287 fn_keypress = true; 288 else 289 num_down++; 290 } 291 292 val >>= 8; 293 } 294 295 /* 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. 300 */ 301 if (kbc->use_ghost_filter && num_down >= 3) { 302 for (i = 0; i < num_down; i++) { 303 unsigned int j; 304 u8 curr_col = scancodes[i] & 0x07; 305 u8 curr_row = scancodes[i] >> KBC_ROW_SHIFT; 306 307 /* 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. 310 */ 311 for (j = i + 1; j < num_down; j++) { 312 u8 col = scancodes[j] & 0x07; 313 u8 row = scancodes[j] >> KBC_ROW_SHIFT; 314 315 if (col == curr_col) 316 key_in_same_col = true; 317 if (row == curr_row) 318 key_in_same_row = true; 319 } 320 } 321 } 322 323 /* 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. 326 */ 327 if (fn_keypress) { 328 for (i = 0; i < num_down; i++) { 329 scancodes[i] += KBC_MAX_KEY; 330 keycodes[i] = kbc->keycode[scancodes[i]]; 331 } 332 } 333 334 /* Ignore the key presses for this iteration? */ 335 if (key_in_same_col && key_in_same_row) 336 return; 337 338 tegra_kbc_report_released_keys(kbc->idev, 339 kbc->current_keys, kbc->num_pressed_keys, 340 keycodes, num_down); 341 tegra_kbc_report_pressed_keys(kbc->idev, scancodes, keycodes, num_down); 342 input_sync(kbc->idev); 343 344 memcpy(kbc->current_keys, keycodes, sizeof(kbc->current_keys)); 345 kbc->num_pressed_keys = num_down; 346 } 347 348 static void tegra_kbc_set_fifo_interrupt(struct tegra_kbc *kbc, bool enable) 349 { 350 u32 val; 351 352 val = readl(kbc->mmio + KBC_CONTROL_0); 353 if (enable) 354 val |= KBC_CONTROL_FIFO_CNT_INT_EN; 355 else 356 val &= ~KBC_CONTROL_FIFO_CNT_INT_EN; 357 writel(val, kbc->mmio + KBC_CONTROL_0); 358 } 359 360 static void tegra_kbc_set_keypress_interrupt(struct tegra_kbc *kbc, bool enable) 361 { 362 u32 val; 363 364 val = readl(kbc->mmio + KBC_CONTROL_0); 365 if (enable) 366 val |= KBC_CONTROL_KEYPRESS_INT_EN; 367 else 368 val &= ~KBC_CONTROL_KEYPRESS_INT_EN; 369 writel(val, kbc->mmio + KBC_CONTROL_0); 370 } 371 372 static void tegra_kbc_keypress_timer(unsigned long data) 373 { 374 struct tegra_kbc *kbc = (struct tegra_kbc *)data; 375 unsigned long flags; 376 u32 val; 377 unsigned int i; 378 379 spin_lock_irqsave(&kbc->lock, flags); 380 381 val = (readl(kbc->mmio + KBC_INT_0) >> 4) & 0xf; 382 if (val) { 383 unsigned long dly; 384 385 tegra_kbc_report_keys(kbc); 386 387 /* 388 * If more than one keys are pressed we need not wait 389 * for the repoll delay. 390 */ 391 dly = (val == 1) ? kbc->repoll_dly : 1; 392 mod_timer(&kbc->timer, jiffies + msecs_to_jiffies(dly)); 393 } else { 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); 398 399 kbc->num_pressed_keys = 0; 400 401 /* All keys are released so enable the keypress interrupt */ 402 tegra_kbc_set_fifo_interrupt(kbc, true); 403 } 404 405 spin_unlock_irqrestore(&kbc->lock, flags); 406 } 407 408 static irqreturn_t tegra_kbc_isr(int irq, void *args) 409 { 410 struct tegra_kbc *kbc = args; 411 unsigned long flags; 412 u32 val; 413 414 spin_lock_irqsave(&kbc->lock, flags); 415 416 /* 417 * Quickly bail out & reenable interrupts if the fifo threshold 418 * count interrupt wasn't the interrupt source 419 */ 420 val = readl(kbc->mmio + KBC_INT_0); 421 writel(val, kbc->mmio + KBC_INT_0); 422 423 if (val & KBC_INT_FIFO_CNT_INT_STATUS) { 424 /* 425 * Until all keys are released, defer further processing to 426 * the polling loop in tegra_kbc_keypress_timer. 427 */ 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; 433 } 434 435 spin_unlock_irqrestore(&kbc->lock, flags); 436 437 return IRQ_HANDLED; 438 } 439 440 static void tegra_kbc_setup_wakekeys(struct tegra_kbc *kbc, bool filter) 441 { 442 const struct tegra_kbc_platform_data *pdata = kbc->pdata; 443 int i; 444 unsigned int rst_val; 445 446 /* Either mask all keys or none. */ 447 rst_val = (filter && !pdata->wakeup) ? ~0 : 0; 448 449 for (i = 0; i < KBC_MAX_ROW; i++) 450 writel(rst_val, kbc->mmio + KBC_ROW0_MASK_0 + i * 4); 451 } 452 453 static void tegra_kbc_config_pins(struct tegra_kbc *kbc) 454 { 455 const struct tegra_kbc_platform_data *pdata = kbc->pdata; 456 int i; 457 458 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); 467 468 row_cfg &= ~r_mask; 469 col_cfg &= ~c_mask; 470 471 switch (pdata->pin_cfg[i].type) { 472 case PIN_CFG_ROW: 473 row_cfg |= ((pdata->pin_cfg[i].num << 1) | 1) << r_shft; 474 break; 475 476 case PIN_CFG_COL: 477 col_cfg |= ((pdata->pin_cfg[i].num << 1) | 1) << c_shft; 478 break; 479 480 case PIN_CFG_IGNORE: 481 break; 482 } 483 484 writel(row_cfg, kbc->mmio + r_offs); 485 writel(col_cfg, kbc->mmio + c_offs); 486 } 487 } 488 489 static int tegra_kbc_start(struct tegra_kbc *kbc) 490 { 491 const struct tegra_kbc_platform_data *pdata = kbc->pdata; 492 unsigned int debounce_cnt; 493 u32 val = 0; 494 495 clk_enable(kbc->clk); 496 497 /* Reset the KBC controller to clear all previous status.*/ 498 tegra_periph_reset_assert(kbc->clk); 499 udelay(100); 500 tegra_periph_reset_deassert(kbc->clk); 501 udelay(100); 502 503 tegra_kbc_config_pins(kbc); 504 tegra_kbc_setup_wakekeys(kbc, false); 505 506 writel(pdata->repeat_cnt, kbc->mmio + KBC_RPT_DLY_0); 507 508 /* 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); 515 516 /* 517 * Compute the delay(ns) from interrupt mode to continuous polling 518 * mode so the timer routine is scheduled appropriately. 519 */ 520 val = readl(kbc->mmio + KBC_INIT_DLY_0); 521 kbc->cp_dly_jiffies = usecs_to_jiffies((val & 0xfffff) * 32); 522 523 kbc->num_pressed_keys = 0; 524 525 /* 526 * Atomically clear out any remaining entries in the key FIFO 527 * and enable keyboard interrupts. 528 */ 529 while (1) { 530 val = readl(kbc->mmio + KBC_INT_0); 531 val >>= 4; 532 if (!val) 533 break; 534 535 val = readl(kbc->mmio + KBC_KP_ENT0_0); 536 val = readl(kbc->mmio + KBC_KP_ENT1_0); 537 } 538 writel(0x7, kbc->mmio + KBC_INT_0); 539 540 enable_irq(kbc->irq); 541 542 return 0; 543 } 544 545 static void tegra_kbc_stop(struct tegra_kbc *kbc) 546 { 547 unsigned long flags; 548 u32 val; 549 550 spin_lock_irqsave(&kbc->lock, flags); 551 val = readl(kbc->mmio + KBC_CONTROL_0); 552 val &= ~1; 553 writel(val, kbc->mmio + KBC_CONTROL_0); 554 spin_unlock_irqrestore(&kbc->lock, flags); 555 556 disable_irq(kbc->irq); 557 del_timer_sync(&kbc->timer); 558 559 clk_disable(kbc->clk); 560 } 561 562 static int tegra_kbc_open(struct input_dev *dev) 563 { 564 struct tegra_kbc *kbc = input_get_drvdata(dev); 565 566 return tegra_kbc_start(kbc); 567 } 568 569 static void tegra_kbc_close(struct input_dev *dev) 570 { 571 struct tegra_kbc *kbc = input_get_drvdata(dev); 572 573 return tegra_kbc_stop(kbc); 574 } 575 576 static bool __devinit 577 tegra_kbc_check_pin_cfg(const struct tegra_kbc_platform_data *pdata, 578 struct device *dev, unsigned int *num_rows) 579 { 580 int i; 581 582 *num_rows = 0; 583 584 for (i = 0; i < KBC_MAX_GPIO; i++) { 585 const struct tegra_kbc_pin_cfg *pin_cfg = &pdata->pin_cfg[i]; 586 587 switch (pin_cfg->type) { 588 case PIN_CFG_ROW: 589 if (pin_cfg->num >= KBC_MAX_ROW) { 590 dev_err(dev, 591 "pin_cfg[%d]: invalid row number %d\n", 592 i, pin_cfg->num); 593 return false; 594 } 595 (*num_rows)++; 596 break; 597 598 case PIN_CFG_COL: 599 if (pin_cfg->num >= KBC_MAX_COL) { 600 dev_err(dev, 601 "pin_cfg[%d]: invalid column number %d\n", 602 i, pin_cfg->num); 603 return false; 604 } 605 break; 606 607 case PIN_CFG_IGNORE: 608 break; 609 610 default: 611 dev_err(dev, 612 "pin_cfg[%d]: invalid entry type %d\n", 613 pin_cfg->type, pin_cfg->num); 614 return false; 615 } 616 } 617 618 return true; 619 } 620 621 #ifdef CONFIG_OF 622 static struct tegra_kbc_platform_data * __devinit 623 tegra_kbc_dt_parse_pdata(struct platform_device *pdev) 624 { 625 struct tegra_kbc_platform_data *pdata; 626 struct device_node *np = pdev->dev.of_node; 627 u32 prop; 628 int i; 629 630 if (!np) 631 return NULL; 632 633 if (!pdata) 634 return NULL; 635 636 if (!of_property_read_u32(np, "nvidia,debounce-delay-ms", &prop)) 637 pdata->debounce_cnt = prop; 638 639 if (!of_property_read_u32(np, "nvidia,repeat-delay-ms", &prop)) 640 pdata->repeat_cnt = prop; 641 642 if (of_find_property(np, "nvidia,needs-ghost-filter", NULL)) 643 pdata->use_ghost_filter = true; 644 645 if (of_find_property(np, "nvidia,wakeup-source", NULL)) 646 pdata->wakeup = true; 647 648 /* 649 * All currently known keymaps with device tree support use the same 650 * pin_cfg, so set it up here. 651 */ 652 for (i = 0; i < KBC_MAX_ROW; i++) { 653 pdata->pin_cfg[i].num = i; 654 pdata->pin_cfg[i].type = PIN_CFG_ROW; 655 } 656 657 for (i = 0; i < KBC_MAX_COL; i++) { 658 pdata->pin_cfg[KBC_MAX_ROW + i].num = i; 659 pdata->pin_cfg[KBC_MAX_ROW + i].type = PIN_CFG_COL; 660 } 661 662 pdata->keymap_data = matrix_keyboard_of_fill_keymap(np, "linux,keymap"); 663 664 /* FIXME: Add handling of linux,fn-keymap here */ 665 666 return pdata; 667 } 668 #else 669 static inline struct tegra_kbc_platform_data *tegra_kbc_dt_parse_pdata( 670 struct platform_device *pdev) 671 { 672 return NULL; 673 } 674 #endif 675 676 static int __devinit tegra_kbc_probe(struct platform_device *pdev) 677 { 678 const struct tegra_kbc_platform_data *pdata = pdev->dev.platform_data; 679 const struct matrix_keymap_data *keymap_data; 680 struct tegra_kbc *kbc; 681 struct input_dev *input_dev; 682 struct resource *res; 683 int irq; 684 int err; 685 int num_rows = 0; 686 unsigned int debounce_cnt; 687 unsigned int scan_time_rows; 688 689 if (!pdata) 690 pdata = tegra_kbc_dt_parse_pdata(pdev); 691 692 if (!pdata) 693 return -EINVAL; 694 695 if (!tegra_kbc_check_pin_cfg(pdata, &pdev->dev, &num_rows)) { 696 err = -EINVAL; 697 goto err_free_pdata; 698 } 699 700 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 701 if (!res) { 702 dev_err(&pdev->dev, "failed to get I/O memory\n"); 703 err = -ENXIO; 704 goto err_free_pdata; 705 } 706 707 irq = platform_get_irq(pdev, 0); 708 if (irq < 0) { 709 dev_err(&pdev->dev, "failed to get keyboard IRQ\n"); 710 err = -ENXIO; 711 goto err_free_pdata; 712 } 713 714 kbc = kzalloc(sizeof(*kbc), GFP_KERNEL); 715 input_dev = input_allocate_device(); 716 if (!kbc || !input_dev) { 717 err = -ENOMEM; 718 goto err_free_mem; 719 } 720 721 kbc->pdata = pdata; 722 kbc->idev = input_dev; 723 kbc->irq = irq; 724 spin_lock_init(&kbc->lock); 725 setup_timer(&kbc->timer, tegra_kbc_keypress_timer, (unsigned long)kbc); 726 727 res = request_mem_region(res->start, resource_size(res), pdev->name); 728 if (!res) { 729 dev_err(&pdev->dev, "failed to request I/O memory\n"); 730 err = -EBUSY; 731 goto err_free_mem; 732 } 733 734 kbc->mmio = ioremap(res->start, resource_size(res)); 735 if (!kbc->mmio) { 736 dev_err(&pdev->dev, "failed to remap I/O memory\n"); 737 err = -ENXIO; 738 goto err_free_mem_region; 739 } 740 741 kbc->clk = clk_get(&pdev->dev, NULL); 742 if (IS_ERR(kbc->clk)) { 743 dev_err(&pdev->dev, "failed to get keyboard clock\n"); 744 err = PTR_ERR(kbc->clk); 745 goto err_iounmap; 746 } 747 748 /* 749 * The time delay between two consecutive reads of the FIFO is 750 * the sum of the repeat time and the time taken for scanning 751 * the rows. There is an additional delay before the row scanning 752 * starts. The repoll delay is computed in milliseconds. 753 */ 754 debounce_cnt = min(pdata->debounce_cnt, KBC_MAX_DEBOUNCE_CNT); 755 scan_time_rows = (KBC_ROW_SCAN_TIME + debounce_cnt) * num_rows; 756 kbc->repoll_dly = KBC_ROW_SCAN_DLY + scan_time_rows + pdata->repeat_cnt; 757 kbc->repoll_dly = DIV_ROUND_UP(kbc->repoll_dly, KBC_CYCLE_MS); 758 759 input_dev->name = pdev->name; 760 input_dev->id.bustype = BUS_HOST; 761 input_dev->dev.parent = &pdev->dev; 762 input_dev->open = tegra_kbc_open; 763 input_dev->close = tegra_kbc_close; 764 765 input_set_drvdata(input_dev, kbc); 766 767 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP); 768 input_set_capability(input_dev, EV_MSC, MSC_SCAN); 769 770 input_dev->keycode = kbc->keycode; 771 input_dev->keycodesize = sizeof(kbc->keycode[0]); 772 input_dev->keycodemax = KBC_MAX_KEY; 773 if (pdata->use_fn_map) 774 input_dev->keycodemax *= 2; 775 776 kbc->use_fn_map = pdata->use_fn_map; 777 kbc->use_ghost_filter = pdata->use_ghost_filter; 778 keymap_data = pdata->keymap_data ?: &tegra_kbc_default_keymap_data; 779 matrix_keypad_build_keymap(keymap_data, KBC_ROW_SHIFT, 780 input_dev->keycode, input_dev->keybit); 781 kbc->wakeup_key = pdata->wakeup_key; 782 783 err = request_irq(kbc->irq, tegra_kbc_isr, 784 IRQF_NO_SUSPEND | IRQF_TRIGGER_HIGH, pdev->name, kbc); 785 if (err) { 786 dev_err(&pdev->dev, "failed to request keyboard IRQ\n"); 787 goto err_put_clk; 788 } 789 790 disable_irq(kbc->irq); 791 792 err = input_register_device(kbc->idev); 793 if (err) { 794 dev_err(&pdev->dev, "failed to register input device\n"); 795 goto err_free_irq; 796 } 797 798 platform_set_drvdata(pdev, kbc); 799 device_init_wakeup(&pdev->dev, pdata->wakeup); 800 801 if (!pdev->dev.platform_data) 802 matrix_keyboard_of_free_keymap(pdata->keymap_data); 803 804 return 0; 805 806 err_free_irq: 807 free_irq(kbc->irq, pdev); 808 err_put_clk: 809 clk_put(kbc->clk); 810 err_iounmap: 811 iounmap(kbc->mmio); 812 err_free_mem_region: 813 release_mem_region(res->start, resource_size(res)); 814 err_free_mem: 815 input_free_device(input_dev); 816 kfree(kbc); 817 err_free_pdata: 818 if (!pdev->dev.platform_data) { 819 matrix_keyboard_of_free_keymap(pdata->keymap_data); 820 kfree(pdata); 821 } 822 823 return err; 824 } 825 826 static int __devexit tegra_kbc_remove(struct platform_device *pdev) 827 { 828 struct tegra_kbc *kbc = platform_get_drvdata(pdev); 829 struct resource *res; 830 831 platform_set_drvdata(pdev, NULL); 832 833 free_irq(kbc->irq, pdev); 834 clk_put(kbc->clk); 835 836 input_unregister_device(kbc->idev); 837 iounmap(kbc->mmio); 838 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 839 release_mem_region(res->start, resource_size(res)); 840 841 /* 842 * If we do not have platform data attached to the device we 843 * allocated it ourselves and thus need to free it. 844 */ 845 if (!pdev->dev.platform_data) 846 kfree(kbc->pdata); 847 848 kfree(kbc); 849 850 return 0; 851 } 852 853 #ifdef CONFIG_PM_SLEEP 854 static int tegra_kbc_suspend(struct device *dev) 855 { 856 struct platform_device *pdev = to_platform_device(dev); 857 struct tegra_kbc *kbc = platform_get_drvdata(pdev); 858 859 mutex_lock(&kbc->idev->mutex); 860 if (device_may_wakeup(&pdev->dev)) { 861 disable_irq(kbc->irq); 862 del_timer_sync(&kbc->timer); 863 tegra_kbc_set_fifo_interrupt(kbc, false); 864 865 /* Forcefully clear the interrupt status */ 866 writel(0x7, kbc->mmio + KBC_INT_0); 867 /* 868 * Store the previous resident time of continuous polling mode. 869 * Force the keyboard into interrupt mode. 870 */ 871 kbc->cp_to_wkup_dly = readl(kbc->mmio + KBC_TO_CNT_0); 872 writel(0, kbc->mmio + KBC_TO_CNT_0); 873 874 tegra_kbc_setup_wakekeys(kbc, true); 875 msleep(30); 876 877 kbc->keypress_caused_wake = false; 878 /* Enable keypress interrupt before going into suspend. */ 879 tegra_kbc_set_keypress_interrupt(kbc, true); 880 enable_irq(kbc->irq); 881 enable_irq_wake(kbc->irq); 882 } else { 883 if (kbc->idev->users) 884 tegra_kbc_stop(kbc); 885 } 886 mutex_unlock(&kbc->idev->mutex); 887 888 return 0; 889 } 890 891 static int tegra_kbc_resume(struct device *dev) 892 { 893 struct platform_device *pdev = to_platform_device(dev); 894 struct tegra_kbc *kbc = platform_get_drvdata(pdev); 895 int err = 0; 896 897 mutex_lock(&kbc->idev->mutex); 898 if (device_may_wakeup(&pdev->dev)) { 899 disable_irq_wake(kbc->irq); 900 tegra_kbc_setup_wakekeys(kbc, false); 901 /* We will use fifo interrupts for key detection. */ 902 tegra_kbc_set_keypress_interrupt(kbc, false); 903 904 /* Restore the resident time of continuous polling mode. */ 905 writel(kbc->cp_to_wkup_dly, kbc->mmio + KBC_TO_CNT_0); 906 907 tegra_kbc_set_fifo_interrupt(kbc, true); 908 909 if (kbc->keypress_caused_wake && kbc->wakeup_key) { 910 /* 911 * We can't report events directly from the ISR 912 * because timekeeping is stopped when processing 913 * wakeup request and we get a nasty warning when 914 * we try to call do_gettimeofday() in evdev 915 * handler. 916 */ 917 input_report_key(kbc->idev, kbc->wakeup_key, 1); 918 input_sync(kbc->idev); 919 input_report_key(kbc->idev, kbc->wakeup_key, 0); 920 input_sync(kbc->idev); 921 } 922 } else { 923 if (kbc->idev->users) 924 err = tegra_kbc_start(kbc); 925 } 926 mutex_unlock(&kbc->idev->mutex); 927 928 return err; 929 } 930 #endif 931 932 static SIMPLE_DEV_PM_OPS(tegra_kbc_pm_ops, tegra_kbc_suspend, tegra_kbc_resume); 933 934 static const struct of_device_id tegra_kbc_of_match[] = { 935 { .compatible = "nvidia,tegra20-kbc", }, 936 { }, 937 }; 938 MODULE_DEVICE_TABLE(of, tegra_kbc_of_match); 939 940 static struct platform_driver tegra_kbc_driver = { 941 .probe = tegra_kbc_probe, 942 .remove = __devexit_p(tegra_kbc_remove), 943 .driver = { 944 .name = "tegra-kbc", 945 .owner = THIS_MODULE, 946 .pm = &tegra_kbc_pm_ops, 947 .of_match_table = tegra_kbc_of_match, 948 }, 949 }; 950 module_platform_driver(tegra_kbc_driver); 951 952 MODULE_LICENSE("GPL"); 953 MODULE_AUTHOR("Rakesh Iyer <riyer@nvidia.com>"); 954 MODULE_DESCRIPTION("Tegra matrix keyboard controller driver"); 955 MODULE_ALIAS("platform:tegra-kbc"); 956