1 /* 2 * linux/drivers/input/keyboard/pxa27x_keypad.c 3 * 4 * Driver for the pxa27x matrix keyboard controller. 5 * 6 * Created: Feb 22, 2007 7 * Author: Rodolfo Giometti <giometti@linux.it> 8 * 9 * Based on a previous implementations by Kevin O'Connor 10 * <kevin_at_koconnor.net> and Alex Osborne <bobofdoom@gmail.com> and 11 * on some suggestions by Nicolas Pitre <nico@fluxnic.net>. 12 * 13 * This program is free software; you can redistribute it and/or modify 14 * it under the terms of the GNU General Public License version 2 as 15 * published by the Free Software Foundation. 16 */ 17 18 19 #include <linux/kernel.h> 20 #include <linux/module.h> 21 #include <linux/interrupt.h> 22 #include <linux/input.h> 23 #include <linux/io.h> 24 #include <linux/device.h> 25 #include <linux/platform_device.h> 26 #include <linux/clk.h> 27 #include <linux/err.h> 28 #include <linux/input/matrix_keypad.h> 29 #include <linux/slab.h> 30 #include <linux/of.h> 31 32 #include <linux/platform_data/keypad-pxa27x.h> 33 /* 34 * Keypad Controller registers 35 */ 36 #define KPC 0x0000 /* Keypad Control register */ 37 #define KPDK 0x0008 /* Keypad Direct Key register */ 38 #define KPREC 0x0010 /* Keypad Rotary Encoder register */ 39 #define KPMK 0x0018 /* Keypad Matrix Key register */ 40 #define KPAS 0x0020 /* Keypad Automatic Scan register */ 41 42 /* Keypad Automatic Scan Multiple Key Presser register 0-3 */ 43 #define KPASMKP0 0x0028 44 #define KPASMKP1 0x0030 45 #define KPASMKP2 0x0038 46 #define KPASMKP3 0x0040 47 #define KPKDI 0x0048 48 49 /* bit definitions */ 50 #define KPC_MKRN(n) ((((n) - 1) & 0x7) << 26) /* matrix key row number */ 51 #define KPC_MKCN(n) ((((n) - 1) & 0x7) << 23) /* matrix key column number */ 52 #define KPC_DKN(n) ((((n) - 1) & 0x7) << 6) /* direct key number */ 53 54 #define KPC_AS (0x1 << 30) /* Automatic Scan bit */ 55 #define KPC_ASACT (0x1 << 29) /* Automatic Scan on Activity */ 56 #define KPC_MI (0x1 << 22) /* Matrix interrupt bit */ 57 #define KPC_IMKP (0x1 << 21) /* Ignore Multiple Key Press */ 58 59 #define KPC_MS(n) (0x1 << (13 + (n))) /* Matrix scan line 'n' */ 60 #define KPC_MS_ALL (0xff << 13) 61 62 #define KPC_ME (0x1 << 12) /* Matrix Keypad Enable */ 63 #define KPC_MIE (0x1 << 11) /* Matrix Interrupt Enable */ 64 #define KPC_DK_DEB_SEL (0x1 << 9) /* Direct Keypad Debounce Select */ 65 #define KPC_DI (0x1 << 5) /* Direct key interrupt bit */ 66 #define KPC_RE_ZERO_DEB (0x1 << 4) /* Rotary Encoder Zero Debounce */ 67 #define KPC_REE1 (0x1 << 3) /* Rotary Encoder1 Enable */ 68 #define KPC_REE0 (0x1 << 2) /* Rotary Encoder0 Enable */ 69 #define KPC_DE (0x1 << 1) /* Direct Keypad Enable */ 70 #define KPC_DIE (0x1 << 0) /* Direct Keypad interrupt Enable */ 71 72 #define KPDK_DKP (0x1 << 31) 73 #define KPDK_DK(n) ((n) & 0xff) 74 75 #define KPREC_OF1 (0x1 << 31) 76 #define kPREC_UF1 (0x1 << 30) 77 #define KPREC_OF0 (0x1 << 15) 78 #define KPREC_UF0 (0x1 << 14) 79 80 #define KPREC_RECOUNT0(n) ((n) & 0xff) 81 #define KPREC_RECOUNT1(n) (((n) >> 16) & 0xff) 82 83 #define KPMK_MKP (0x1 << 31) 84 #define KPAS_SO (0x1 << 31) 85 #define KPASMKPx_SO (0x1 << 31) 86 87 #define KPAS_MUKP(n) (((n) >> 26) & 0x1f) 88 #define KPAS_RP(n) (((n) >> 4) & 0xf) 89 #define KPAS_CP(n) ((n) & 0xf) 90 91 #define KPASMKP_MKC_MASK (0xff) 92 93 #define keypad_readl(off) __raw_readl(keypad->mmio_base + (off)) 94 #define keypad_writel(off, v) __raw_writel((v), keypad->mmio_base + (off)) 95 96 #define MAX_MATRIX_KEY_NUM (MAX_MATRIX_KEY_ROWS * MAX_MATRIX_KEY_COLS) 97 #define MAX_KEYPAD_KEYS (MAX_MATRIX_KEY_NUM + MAX_DIRECT_KEY_NUM) 98 99 struct pxa27x_keypad { 100 const struct pxa27x_keypad_platform_data *pdata; 101 102 struct clk *clk; 103 struct input_dev *input_dev; 104 void __iomem *mmio_base; 105 106 int irq; 107 108 unsigned short keycodes[MAX_KEYPAD_KEYS]; 109 int rotary_rel_code[2]; 110 111 unsigned int row_shift; 112 113 /* state row bits of each column scan */ 114 uint32_t matrix_key_state[MAX_MATRIX_KEY_COLS]; 115 uint32_t direct_key_state; 116 117 unsigned int direct_key_mask; 118 }; 119 120 #ifdef CONFIG_OF 121 static int pxa27x_keypad_matrix_key_parse_dt(struct pxa27x_keypad *keypad, 122 struct pxa27x_keypad_platform_data *pdata) 123 { 124 struct input_dev *input_dev = keypad->input_dev; 125 struct device *dev = input_dev->dev.parent; 126 u32 rows, cols; 127 int error; 128 129 error = matrix_keypad_parse_of_params(dev, &rows, &cols); 130 if (error) 131 return error; 132 133 if (rows > MAX_MATRIX_KEY_ROWS || cols > MAX_MATRIX_KEY_COLS) { 134 dev_err(dev, "rows or cols exceeds maximum value\n"); 135 return -EINVAL; 136 } 137 138 pdata->matrix_key_rows = rows; 139 pdata->matrix_key_cols = cols; 140 141 error = matrix_keypad_build_keymap(NULL, NULL, 142 pdata->matrix_key_rows, 143 pdata->matrix_key_cols, 144 keypad->keycodes, input_dev); 145 if (error) 146 return error; 147 148 return 0; 149 } 150 151 static int pxa27x_keypad_direct_key_parse_dt(struct pxa27x_keypad *keypad, 152 struct pxa27x_keypad_platform_data *pdata) 153 { 154 struct input_dev *input_dev = keypad->input_dev; 155 struct device *dev = input_dev->dev.parent; 156 struct device_node *np = dev->of_node; 157 const __be16 *prop; 158 unsigned short code; 159 unsigned int proplen, size; 160 int i; 161 int error; 162 163 error = of_property_read_u32(np, "marvell,direct-key-count", 164 &pdata->direct_key_num); 165 if (error) { 166 /* 167 * If do not have marvel,direct-key-count defined, 168 * it means direct key is not supported. 169 */ 170 return error == -EINVAL ? 0 : error; 171 } 172 173 error = of_property_read_u32(np, "marvell,direct-key-mask", 174 &pdata->direct_key_mask); 175 if (error) { 176 if (error != -EINVAL) 177 return error; 178 179 /* 180 * If marvell,direct-key-mask is not defined, driver will use 181 * default value. Default value is set when configure the keypad. 182 */ 183 pdata->direct_key_mask = 0; 184 } 185 186 pdata->direct_key_low_active = of_property_read_bool(np, 187 "marvell,direct-key-low-active"); 188 189 prop = of_get_property(np, "marvell,direct-key-map", &proplen); 190 if (!prop) 191 return -EINVAL; 192 193 if (proplen % sizeof(u16)) 194 return -EINVAL; 195 196 size = proplen / sizeof(u16); 197 198 /* Only MAX_DIRECT_KEY_NUM is accepted.*/ 199 if (size > MAX_DIRECT_KEY_NUM) 200 return -EINVAL; 201 202 for (i = 0; i < size; i++) { 203 code = be16_to_cpup(prop + i); 204 keypad->keycodes[MAX_MATRIX_KEY_NUM + i] = code; 205 __set_bit(code, input_dev->keybit); 206 } 207 208 return 0; 209 } 210 211 static int pxa27x_keypad_rotary_parse_dt(struct pxa27x_keypad *keypad, 212 struct pxa27x_keypad_platform_data *pdata) 213 { 214 const __be32 *prop; 215 int i, relkey_ret; 216 unsigned int code, proplen; 217 const char *rotaryname[2] = { 218 "marvell,rotary0", "marvell,rotary1"}; 219 const char relkeyname[] = {"marvell,rotary-rel-key"}; 220 struct input_dev *input_dev = keypad->input_dev; 221 struct device *dev = input_dev->dev.parent; 222 struct device_node *np = dev->of_node; 223 224 relkey_ret = of_property_read_u32(np, relkeyname, &code); 225 /* if can read correct rotary key-code, we do not need this. */ 226 if (relkey_ret == 0) { 227 unsigned short relcode; 228 229 /* rotary0 taks lower half, rotary1 taks upper half. */ 230 relcode = code & 0xffff; 231 pdata->rotary0_rel_code = (code & 0xffff); 232 __set_bit(relcode, input_dev->relbit); 233 234 relcode = code >> 16; 235 pdata->rotary1_rel_code = relcode; 236 __set_bit(relcode, input_dev->relbit); 237 } 238 239 for (i = 0; i < 2; i++) { 240 prop = of_get_property(np, rotaryname[i], &proplen); 241 /* 242 * If the prop is not set, it means keypad does not need 243 * initialize the rotaryX. 244 */ 245 if (!prop) 246 continue; 247 248 code = be32_to_cpup(prop); 249 /* 250 * Not all up/down key code are valid. 251 * Now we depends on direct-rel-code. 252 */ 253 if ((!(code & 0xffff) || !(code >> 16)) && relkey_ret) { 254 return relkey_ret; 255 } else { 256 unsigned int n = MAX_MATRIX_KEY_NUM + (i << 1); 257 unsigned short keycode; 258 259 keycode = code & 0xffff; 260 keypad->keycodes[n] = keycode; 261 __set_bit(keycode, input_dev->keybit); 262 263 keycode = code >> 16; 264 keypad->keycodes[n + 1] = keycode; 265 __set_bit(keycode, input_dev->keybit); 266 267 if (i == 0) 268 pdata->rotary0_rel_code = -1; 269 else 270 pdata->rotary1_rel_code = -1; 271 } 272 if (i == 0) 273 pdata->enable_rotary0 = 1; 274 else 275 pdata->enable_rotary1 = 1; 276 } 277 278 keypad->rotary_rel_code[0] = pdata->rotary0_rel_code; 279 keypad->rotary_rel_code[1] = pdata->rotary1_rel_code; 280 281 return 0; 282 } 283 284 static int pxa27x_keypad_build_keycode_from_dt(struct pxa27x_keypad *keypad) 285 { 286 struct input_dev *input_dev = keypad->input_dev; 287 struct device *dev = input_dev->dev.parent; 288 struct device_node *np = dev->of_node; 289 struct pxa27x_keypad_platform_data *pdata; 290 int error; 291 292 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); 293 if (!pdata) { 294 dev_err(dev, "failed to allocate memory for pdata\n"); 295 return -ENOMEM; 296 } 297 298 error = pxa27x_keypad_matrix_key_parse_dt(keypad, pdata); 299 if (error) { 300 dev_err(dev, "failed to parse matrix key\n"); 301 return error; 302 } 303 304 error = pxa27x_keypad_direct_key_parse_dt(keypad, pdata); 305 if (error) { 306 dev_err(dev, "failed to parse direct key\n"); 307 return error; 308 } 309 310 error = pxa27x_keypad_rotary_parse_dt(keypad, pdata); 311 if (error) { 312 dev_err(dev, "failed to parse rotary key\n"); 313 return error; 314 } 315 316 error = of_property_read_u32(np, "marvell,debounce-interval", 317 &pdata->debounce_interval); 318 if (error) { 319 dev_err(dev, "failed to parse debpunce-interval\n"); 320 return error; 321 } 322 323 /* 324 * The keycodes may not only includes matrix key but also the direct 325 * key or rotary key. 326 */ 327 input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes); 328 329 keypad->pdata = pdata; 330 return 0; 331 } 332 333 #else 334 335 static int pxa27x_keypad_build_keycode_from_dt(struct pxa27x_keypad *keypad) 336 { 337 dev_info(keypad->input_dev->dev.parent, "missing platform data\n"); 338 339 return -EINVAL; 340 } 341 342 #endif 343 344 static int pxa27x_keypad_build_keycode(struct pxa27x_keypad *keypad) 345 { 346 const struct pxa27x_keypad_platform_data *pdata = keypad->pdata; 347 struct input_dev *input_dev = keypad->input_dev; 348 const struct matrix_keymap_data *keymap_data = 349 pdata ? pdata->matrix_keymap_data : NULL; 350 unsigned short keycode; 351 int i; 352 int error; 353 354 error = matrix_keypad_build_keymap(keymap_data, NULL, 355 pdata->matrix_key_rows, 356 pdata->matrix_key_cols, 357 keypad->keycodes, input_dev); 358 if (error) 359 return error; 360 361 /* 362 * The keycodes may not only include matrix keys but also the direct 363 * or rotary keys. 364 */ 365 input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes); 366 367 /* For direct keys. */ 368 for (i = 0; i < pdata->direct_key_num; i++) { 369 keycode = pdata->direct_key_map[i]; 370 keypad->keycodes[MAX_MATRIX_KEY_NUM + i] = keycode; 371 __set_bit(keycode, input_dev->keybit); 372 } 373 374 if (pdata->enable_rotary0) { 375 if (pdata->rotary0_up_key && pdata->rotary0_down_key) { 376 keycode = pdata->rotary0_up_key; 377 keypad->keycodes[MAX_MATRIX_KEY_NUM + 0] = keycode; 378 __set_bit(keycode, input_dev->keybit); 379 380 keycode = pdata->rotary0_down_key; 381 keypad->keycodes[MAX_MATRIX_KEY_NUM + 1] = keycode; 382 __set_bit(keycode, input_dev->keybit); 383 384 keypad->rotary_rel_code[0] = -1; 385 } else { 386 keypad->rotary_rel_code[0] = pdata->rotary0_rel_code; 387 __set_bit(pdata->rotary0_rel_code, input_dev->relbit); 388 } 389 } 390 391 if (pdata->enable_rotary1) { 392 if (pdata->rotary1_up_key && pdata->rotary1_down_key) { 393 keycode = pdata->rotary1_up_key; 394 keypad->keycodes[MAX_MATRIX_KEY_NUM + 2] = keycode; 395 __set_bit(keycode, input_dev->keybit); 396 397 keycode = pdata->rotary1_down_key; 398 keypad->keycodes[MAX_MATRIX_KEY_NUM + 3] = keycode; 399 __set_bit(keycode, input_dev->keybit); 400 401 keypad->rotary_rel_code[1] = -1; 402 } else { 403 keypad->rotary_rel_code[1] = pdata->rotary1_rel_code; 404 __set_bit(pdata->rotary1_rel_code, input_dev->relbit); 405 } 406 } 407 408 __clear_bit(KEY_RESERVED, input_dev->keybit); 409 410 return 0; 411 } 412 413 static void pxa27x_keypad_scan_matrix(struct pxa27x_keypad *keypad) 414 { 415 const struct pxa27x_keypad_platform_data *pdata = keypad->pdata; 416 struct input_dev *input_dev = keypad->input_dev; 417 int row, col, num_keys_pressed = 0; 418 uint32_t new_state[MAX_MATRIX_KEY_COLS]; 419 uint32_t kpas = keypad_readl(KPAS); 420 421 num_keys_pressed = KPAS_MUKP(kpas); 422 423 memset(new_state, 0, sizeof(new_state)); 424 425 if (num_keys_pressed == 0) 426 goto scan; 427 428 if (num_keys_pressed == 1) { 429 col = KPAS_CP(kpas); 430 row = KPAS_RP(kpas); 431 432 /* if invalid row/col, treat as no key pressed */ 433 if (col >= pdata->matrix_key_cols || 434 row >= pdata->matrix_key_rows) 435 goto scan; 436 437 new_state[col] = (1 << row); 438 goto scan; 439 } 440 441 if (num_keys_pressed > 1) { 442 uint32_t kpasmkp0 = keypad_readl(KPASMKP0); 443 uint32_t kpasmkp1 = keypad_readl(KPASMKP1); 444 uint32_t kpasmkp2 = keypad_readl(KPASMKP2); 445 uint32_t kpasmkp3 = keypad_readl(KPASMKP3); 446 447 new_state[0] = kpasmkp0 & KPASMKP_MKC_MASK; 448 new_state[1] = (kpasmkp0 >> 16) & KPASMKP_MKC_MASK; 449 new_state[2] = kpasmkp1 & KPASMKP_MKC_MASK; 450 new_state[3] = (kpasmkp1 >> 16) & KPASMKP_MKC_MASK; 451 new_state[4] = kpasmkp2 & KPASMKP_MKC_MASK; 452 new_state[5] = (kpasmkp2 >> 16) & KPASMKP_MKC_MASK; 453 new_state[6] = kpasmkp3 & KPASMKP_MKC_MASK; 454 new_state[7] = (kpasmkp3 >> 16) & KPASMKP_MKC_MASK; 455 } 456 scan: 457 for (col = 0; col < pdata->matrix_key_cols; col++) { 458 uint32_t bits_changed; 459 int code; 460 461 bits_changed = keypad->matrix_key_state[col] ^ new_state[col]; 462 if (bits_changed == 0) 463 continue; 464 465 for (row = 0; row < pdata->matrix_key_rows; row++) { 466 if ((bits_changed & (1 << row)) == 0) 467 continue; 468 469 code = MATRIX_SCAN_CODE(row, col, keypad->row_shift); 470 471 input_event(input_dev, EV_MSC, MSC_SCAN, code); 472 input_report_key(input_dev, keypad->keycodes[code], 473 new_state[col] & (1 << row)); 474 } 475 } 476 input_sync(input_dev); 477 memcpy(keypad->matrix_key_state, new_state, sizeof(new_state)); 478 } 479 480 #define DEFAULT_KPREC (0x007f007f) 481 482 static inline int rotary_delta(uint32_t kprec) 483 { 484 if (kprec & KPREC_OF0) 485 return (kprec & 0xff) + 0x7f; 486 else if (kprec & KPREC_UF0) 487 return (kprec & 0xff) - 0x7f - 0xff; 488 else 489 return (kprec & 0xff) - 0x7f; 490 } 491 492 static void report_rotary_event(struct pxa27x_keypad *keypad, int r, int delta) 493 { 494 struct input_dev *dev = keypad->input_dev; 495 496 if (delta == 0) 497 return; 498 499 if (keypad->rotary_rel_code[r] == -1) { 500 int code = MAX_MATRIX_KEY_NUM + 2 * r + (delta > 0 ? 0 : 1); 501 unsigned char keycode = keypad->keycodes[code]; 502 503 /* simulate a press-n-release */ 504 input_event(dev, EV_MSC, MSC_SCAN, code); 505 input_report_key(dev, keycode, 1); 506 input_sync(dev); 507 input_event(dev, EV_MSC, MSC_SCAN, code); 508 input_report_key(dev, keycode, 0); 509 input_sync(dev); 510 } else { 511 input_report_rel(dev, keypad->rotary_rel_code[r], delta); 512 input_sync(dev); 513 } 514 } 515 516 static void pxa27x_keypad_scan_rotary(struct pxa27x_keypad *keypad) 517 { 518 const struct pxa27x_keypad_platform_data *pdata = keypad->pdata; 519 uint32_t kprec; 520 521 /* read and reset to default count value */ 522 kprec = keypad_readl(KPREC); 523 keypad_writel(KPREC, DEFAULT_KPREC); 524 525 if (pdata->enable_rotary0) 526 report_rotary_event(keypad, 0, rotary_delta(kprec)); 527 528 if (pdata->enable_rotary1) 529 report_rotary_event(keypad, 1, rotary_delta(kprec >> 16)); 530 } 531 532 static void pxa27x_keypad_scan_direct(struct pxa27x_keypad *keypad) 533 { 534 const struct pxa27x_keypad_platform_data *pdata = keypad->pdata; 535 struct input_dev *input_dev = keypad->input_dev; 536 unsigned int new_state; 537 uint32_t kpdk, bits_changed; 538 int i; 539 540 kpdk = keypad_readl(KPDK); 541 542 if (pdata->enable_rotary0 || pdata->enable_rotary1) 543 pxa27x_keypad_scan_rotary(keypad); 544 545 /* 546 * The KPDR_DK only output the key pin level, so it relates to board, 547 * and low level may be active. 548 */ 549 if (pdata->direct_key_low_active) 550 new_state = ~KPDK_DK(kpdk) & keypad->direct_key_mask; 551 else 552 new_state = KPDK_DK(kpdk) & keypad->direct_key_mask; 553 554 bits_changed = keypad->direct_key_state ^ new_state; 555 556 if (bits_changed == 0) 557 return; 558 559 for (i = 0; i < pdata->direct_key_num; i++) { 560 if (bits_changed & (1 << i)) { 561 int code = MAX_MATRIX_KEY_NUM + i; 562 563 input_event(input_dev, EV_MSC, MSC_SCAN, code); 564 input_report_key(input_dev, keypad->keycodes[code], 565 new_state & (1 << i)); 566 } 567 } 568 input_sync(input_dev); 569 keypad->direct_key_state = new_state; 570 } 571 572 static void clear_wakeup_event(struct pxa27x_keypad *keypad) 573 { 574 const struct pxa27x_keypad_platform_data *pdata = keypad->pdata; 575 576 if (pdata->clear_wakeup_event) 577 (pdata->clear_wakeup_event)(); 578 } 579 580 static irqreturn_t pxa27x_keypad_irq_handler(int irq, void *dev_id) 581 { 582 struct pxa27x_keypad *keypad = dev_id; 583 unsigned long kpc = keypad_readl(KPC); 584 585 clear_wakeup_event(keypad); 586 587 if (kpc & KPC_DI) 588 pxa27x_keypad_scan_direct(keypad); 589 590 if (kpc & KPC_MI) 591 pxa27x_keypad_scan_matrix(keypad); 592 593 return IRQ_HANDLED; 594 } 595 596 static void pxa27x_keypad_config(struct pxa27x_keypad *keypad) 597 { 598 const struct pxa27x_keypad_platform_data *pdata = keypad->pdata; 599 unsigned int mask = 0, direct_key_num = 0; 600 unsigned long kpc = 0; 601 602 /* clear pending interrupt bit */ 603 keypad_readl(KPC); 604 605 /* enable matrix keys with automatic scan */ 606 if (pdata->matrix_key_rows && pdata->matrix_key_cols) { 607 kpc |= KPC_ASACT | KPC_MIE | KPC_ME | KPC_MS_ALL; 608 kpc |= KPC_MKRN(pdata->matrix_key_rows) | 609 KPC_MKCN(pdata->matrix_key_cols); 610 } 611 612 /* enable rotary key, debounce interval same as direct keys */ 613 if (pdata->enable_rotary0) { 614 mask |= 0x03; 615 direct_key_num = 2; 616 kpc |= KPC_REE0; 617 } 618 619 if (pdata->enable_rotary1) { 620 mask |= 0x0c; 621 direct_key_num = 4; 622 kpc |= KPC_REE1; 623 } 624 625 if (pdata->direct_key_num > direct_key_num) 626 direct_key_num = pdata->direct_key_num; 627 628 /* 629 * Direct keys usage may not start from KP_DKIN0, check the platfrom 630 * mask data to config the specific. 631 */ 632 if (pdata->direct_key_mask) 633 keypad->direct_key_mask = pdata->direct_key_mask; 634 else 635 keypad->direct_key_mask = ((1 << direct_key_num) - 1) & ~mask; 636 637 /* enable direct key */ 638 if (direct_key_num) 639 kpc |= KPC_DE | KPC_DIE | KPC_DKN(direct_key_num); 640 641 keypad_writel(KPC, kpc | KPC_RE_ZERO_DEB); 642 keypad_writel(KPREC, DEFAULT_KPREC); 643 keypad_writel(KPKDI, pdata->debounce_interval); 644 } 645 646 static int pxa27x_keypad_open(struct input_dev *dev) 647 { 648 struct pxa27x_keypad *keypad = input_get_drvdata(dev); 649 650 /* Enable unit clock */ 651 clk_prepare_enable(keypad->clk); 652 pxa27x_keypad_config(keypad); 653 654 return 0; 655 } 656 657 static void pxa27x_keypad_close(struct input_dev *dev) 658 { 659 struct pxa27x_keypad *keypad = input_get_drvdata(dev); 660 661 /* Disable clock unit */ 662 clk_disable_unprepare(keypad->clk); 663 } 664 665 #ifdef CONFIG_PM_SLEEP 666 static int pxa27x_keypad_suspend(struct device *dev) 667 { 668 struct platform_device *pdev = to_platform_device(dev); 669 struct pxa27x_keypad *keypad = platform_get_drvdata(pdev); 670 671 /* 672 * If the keypad is used a wake up source, clock can not be disabled. 673 * Or it can not detect the key pressing. 674 */ 675 if (device_may_wakeup(&pdev->dev)) 676 enable_irq_wake(keypad->irq); 677 else 678 clk_disable_unprepare(keypad->clk); 679 680 return 0; 681 } 682 683 static int pxa27x_keypad_resume(struct device *dev) 684 { 685 struct platform_device *pdev = to_platform_device(dev); 686 struct pxa27x_keypad *keypad = platform_get_drvdata(pdev); 687 struct input_dev *input_dev = keypad->input_dev; 688 689 /* 690 * If the keypad is used as wake up source, the clock is not turned 691 * off. So do not need configure it again. 692 */ 693 if (device_may_wakeup(&pdev->dev)) { 694 disable_irq_wake(keypad->irq); 695 } else { 696 mutex_lock(&input_dev->mutex); 697 698 if (input_dev->users) { 699 /* Enable unit clock */ 700 clk_prepare_enable(keypad->clk); 701 pxa27x_keypad_config(keypad); 702 } 703 704 mutex_unlock(&input_dev->mutex); 705 } 706 707 return 0; 708 } 709 #endif 710 711 static SIMPLE_DEV_PM_OPS(pxa27x_keypad_pm_ops, 712 pxa27x_keypad_suspend, pxa27x_keypad_resume); 713 714 715 static int pxa27x_keypad_probe(struct platform_device *pdev) 716 { 717 const struct pxa27x_keypad_platform_data *pdata = 718 dev_get_platdata(&pdev->dev); 719 struct device_node *np = pdev->dev.of_node; 720 struct pxa27x_keypad *keypad; 721 struct input_dev *input_dev; 722 struct resource *res; 723 int irq, error; 724 725 /* Driver need build keycode from device tree or pdata */ 726 if (!np && !pdata) 727 return -EINVAL; 728 729 irq = platform_get_irq(pdev, 0); 730 if (irq < 0) { 731 dev_err(&pdev->dev, "failed to get keypad irq\n"); 732 return -ENXIO; 733 } 734 735 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 736 if (res == NULL) { 737 dev_err(&pdev->dev, "failed to get I/O memory\n"); 738 return -ENXIO; 739 } 740 741 keypad = devm_kzalloc(&pdev->dev, sizeof(*keypad), 742 GFP_KERNEL); 743 if (!keypad) 744 return -ENOMEM; 745 746 input_dev = devm_input_allocate_device(&pdev->dev); 747 if (!input_dev) 748 return -ENOMEM; 749 750 keypad->pdata = pdata; 751 keypad->input_dev = input_dev; 752 keypad->irq = irq; 753 754 keypad->mmio_base = devm_ioremap_resource(&pdev->dev, res); 755 if (IS_ERR(keypad->mmio_base)) 756 return PTR_ERR(keypad->mmio_base); 757 758 keypad->clk = devm_clk_get(&pdev->dev, NULL); 759 if (IS_ERR(keypad->clk)) { 760 dev_err(&pdev->dev, "failed to get keypad clock\n"); 761 return PTR_ERR(keypad->clk); 762 } 763 764 input_dev->name = pdev->name; 765 input_dev->id.bustype = BUS_HOST; 766 input_dev->open = pxa27x_keypad_open; 767 input_dev->close = pxa27x_keypad_close; 768 input_dev->dev.parent = &pdev->dev; 769 770 input_dev->keycode = keypad->keycodes; 771 input_dev->keycodesize = sizeof(keypad->keycodes[0]); 772 input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes); 773 774 input_set_drvdata(input_dev, keypad); 775 776 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP); 777 input_set_capability(input_dev, EV_MSC, MSC_SCAN); 778 779 if (pdata) { 780 error = pxa27x_keypad_build_keycode(keypad); 781 } else { 782 error = pxa27x_keypad_build_keycode_from_dt(keypad); 783 /* 784 * Data that we get from DT resides in dynamically 785 * allocated memory so we need to update our pdata 786 * pointer. 787 */ 788 pdata = keypad->pdata; 789 } 790 if (error) { 791 dev_err(&pdev->dev, "failed to build keycode\n"); 792 return error; 793 } 794 795 keypad->row_shift = get_count_order(pdata->matrix_key_cols); 796 797 if ((pdata->enable_rotary0 && keypad->rotary_rel_code[0] != -1) || 798 (pdata->enable_rotary1 && keypad->rotary_rel_code[1] != -1)) { 799 input_dev->evbit[0] |= BIT_MASK(EV_REL); 800 } 801 802 error = devm_request_irq(&pdev->dev, irq, pxa27x_keypad_irq_handler, 803 0, pdev->name, keypad); 804 if (error) { 805 dev_err(&pdev->dev, "failed to request IRQ\n"); 806 return error; 807 } 808 809 /* Register the input device */ 810 error = input_register_device(input_dev); 811 if (error) { 812 dev_err(&pdev->dev, "failed to register input device\n"); 813 return error; 814 } 815 816 platform_set_drvdata(pdev, keypad); 817 device_init_wakeup(&pdev->dev, 1); 818 819 return 0; 820 } 821 822 #ifdef CONFIG_OF 823 static const struct of_device_id pxa27x_keypad_dt_match[] = { 824 { .compatible = "marvell,pxa27x-keypad" }, 825 {}, 826 }; 827 MODULE_DEVICE_TABLE(of, pxa27x_keypad_dt_match); 828 #endif 829 830 static struct platform_driver pxa27x_keypad_driver = { 831 .probe = pxa27x_keypad_probe, 832 .driver = { 833 .name = "pxa27x-keypad", 834 .of_match_table = of_match_ptr(pxa27x_keypad_dt_match), 835 .pm = &pxa27x_keypad_pm_ops, 836 }, 837 }; 838 module_platform_driver(pxa27x_keypad_driver); 839 840 MODULE_DESCRIPTION("PXA27x Keypad Controller Driver"); 841 MODULE_LICENSE("GPL"); 842 /* work with hotplug and coldplug */ 843 MODULE_ALIAS("platform:pxa27x-keypad"); 844