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 debounce-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 unsigned short keycode; 349 int i; 350 int error; 351 352 error = matrix_keypad_build_keymap(pdata->matrix_keymap_data, NULL, 353 pdata->matrix_key_rows, 354 pdata->matrix_key_cols, 355 keypad->keycodes, input_dev); 356 if (error) 357 return error; 358 359 /* 360 * The keycodes may not only include matrix keys but also the direct 361 * or rotary keys. 362 */ 363 input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes); 364 365 /* For direct keys. */ 366 for (i = 0; i < pdata->direct_key_num; i++) { 367 keycode = pdata->direct_key_map[i]; 368 keypad->keycodes[MAX_MATRIX_KEY_NUM + i] = keycode; 369 __set_bit(keycode, input_dev->keybit); 370 } 371 372 if (pdata->enable_rotary0) { 373 if (pdata->rotary0_up_key && pdata->rotary0_down_key) { 374 keycode = pdata->rotary0_up_key; 375 keypad->keycodes[MAX_MATRIX_KEY_NUM + 0] = keycode; 376 __set_bit(keycode, input_dev->keybit); 377 378 keycode = pdata->rotary0_down_key; 379 keypad->keycodes[MAX_MATRIX_KEY_NUM + 1] = keycode; 380 __set_bit(keycode, input_dev->keybit); 381 382 keypad->rotary_rel_code[0] = -1; 383 } else { 384 keypad->rotary_rel_code[0] = pdata->rotary0_rel_code; 385 __set_bit(pdata->rotary0_rel_code, input_dev->relbit); 386 } 387 } 388 389 if (pdata->enable_rotary1) { 390 if (pdata->rotary1_up_key && pdata->rotary1_down_key) { 391 keycode = pdata->rotary1_up_key; 392 keypad->keycodes[MAX_MATRIX_KEY_NUM + 2] = keycode; 393 __set_bit(keycode, input_dev->keybit); 394 395 keycode = pdata->rotary1_down_key; 396 keypad->keycodes[MAX_MATRIX_KEY_NUM + 3] = keycode; 397 __set_bit(keycode, input_dev->keybit); 398 399 keypad->rotary_rel_code[1] = -1; 400 } else { 401 keypad->rotary_rel_code[1] = pdata->rotary1_rel_code; 402 __set_bit(pdata->rotary1_rel_code, input_dev->relbit); 403 } 404 } 405 406 __clear_bit(KEY_RESERVED, input_dev->keybit); 407 408 return 0; 409 } 410 411 static void pxa27x_keypad_scan_matrix(struct pxa27x_keypad *keypad) 412 { 413 const struct pxa27x_keypad_platform_data *pdata = keypad->pdata; 414 struct input_dev *input_dev = keypad->input_dev; 415 int row, col, num_keys_pressed = 0; 416 uint32_t new_state[MAX_MATRIX_KEY_COLS]; 417 uint32_t kpas = keypad_readl(KPAS); 418 419 num_keys_pressed = KPAS_MUKP(kpas); 420 421 memset(new_state, 0, sizeof(new_state)); 422 423 if (num_keys_pressed == 0) 424 goto scan; 425 426 if (num_keys_pressed == 1) { 427 col = KPAS_CP(kpas); 428 row = KPAS_RP(kpas); 429 430 /* if invalid row/col, treat as no key pressed */ 431 if (col >= pdata->matrix_key_cols || 432 row >= pdata->matrix_key_rows) 433 goto scan; 434 435 new_state[col] = (1 << row); 436 goto scan; 437 } 438 439 if (num_keys_pressed > 1) { 440 uint32_t kpasmkp0 = keypad_readl(KPASMKP0); 441 uint32_t kpasmkp1 = keypad_readl(KPASMKP1); 442 uint32_t kpasmkp2 = keypad_readl(KPASMKP2); 443 uint32_t kpasmkp3 = keypad_readl(KPASMKP3); 444 445 new_state[0] = kpasmkp0 & KPASMKP_MKC_MASK; 446 new_state[1] = (kpasmkp0 >> 16) & KPASMKP_MKC_MASK; 447 new_state[2] = kpasmkp1 & KPASMKP_MKC_MASK; 448 new_state[3] = (kpasmkp1 >> 16) & KPASMKP_MKC_MASK; 449 new_state[4] = kpasmkp2 & KPASMKP_MKC_MASK; 450 new_state[5] = (kpasmkp2 >> 16) & KPASMKP_MKC_MASK; 451 new_state[6] = kpasmkp3 & KPASMKP_MKC_MASK; 452 new_state[7] = (kpasmkp3 >> 16) & KPASMKP_MKC_MASK; 453 } 454 scan: 455 for (col = 0; col < pdata->matrix_key_cols; col++) { 456 uint32_t bits_changed; 457 int code; 458 459 bits_changed = keypad->matrix_key_state[col] ^ new_state[col]; 460 if (bits_changed == 0) 461 continue; 462 463 for (row = 0; row < pdata->matrix_key_rows; row++) { 464 if ((bits_changed & (1 << row)) == 0) 465 continue; 466 467 code = MATRIX_SCAN_CODE(row, col, keypad->row_shift); 468 469 input_event(input_dev, EV_MSC, MSC_SCAN, code); 470 input_report_key(input_dev, keypad->keycodes[code], 471 new_state[col] & (1 << row)); 472 } 473 } 474 input_sync(input_dev); 475 memcpy(keypad->matrix_key_state, new_state, sizeof(new_state)); 476 } 477 478 #define DEFAULT_KPREC (0x007f007f) 479 480 static inline int rotary_delta(uint32_t kprec) 481 { 482 if (kprec & KPREC_OF0) 483 return (kprec & 0xff) + 0x7f; 484 else if (kprec & KPREC_UF0) 485 return (kprec & 0xff) - 0x7f - 0xff; 486 else 487 return (kprec & 0xff) - 0x7f; 488 } 489 490 static void report_rotary_event(struct pxa27x_keypad *keypad, int r, int delta) 491 { 492 struct input_dev *dev = keypad->input_dev; 493 494 if (delta == 0) 495 return; 496 497 if (keypad->rotary_rel_code[r] == -1) { 498 int code = MAX_MATRIX_KEY_NUM + 2 * r + (delta > 0 ? 0 : 1); 499 unsigned char keycode = keypad->keycodes[code]; 500 501 /* simulate a press-n-release */ 502 input_event(dev, EV_MSC, MSC_SCAN, code); 503 input_report_key(dev, keycode, 1); 504 input_sync(dev); 505 input_event(dev, EV_MSC, MSC_SCAN, code); 506 input_report_key(dev, keycode, 0); 507 input_sync(dev); 508 } else { 509 input_report_rel(dev, keypad->rotary_rel_code[r], delta); 510 input_sync(dev); 511 } 512 } 513 514 static void pxa27x_keypad_scan_rotary(struct pxa27x_keypad *keypad) 515 { 516 const struct pxa27x_keypad_platform_data *pdata = keypad->pdata; 517 uint32_t kprec; 518 519 /* read and reset to default count value */ 520 kprec = keypad_readl(KPREC); 521 keypad_writel(KPREC, DEFAULT_KPREC); 522 523 if (pdata->enable_rotary0) 524 report_rotary_event(keypad, 0, rotary_delta(kprec)); 525 526 if (pdata->enable_rotary1) 527 report_rotary_event(keypad, 1, rotary_delta(kprec >> 16)); 528 } 529 530 static void pxa27x_keypad_scan_direct(struct pxa27x_keypad *keypad) 531 { 532 const struct pxa27x_keypad_platform_data *pdata = keypad->pdata; 533 struct input_dev *input_dev = keypad->input_dev; 534 unsigned int new_state; 535 uint32_t kpdk, bits_changed; 536 int i; 537 538 kpdk = keypad_readl(KPDK); 539 540 if (pdata->enable_rotary0 || pdata->enable_rotary1) 541 pxa27x_keypad_scan_rotary(keypad); 542 543 /* 544 * The KPDR_DK only output the key pin level, so it relates to board, 545 * and low level may be active. 546 */ 547 if (pdata->direct_key_low_active) 548 new_state = ~KPDK_DK(kpdk) & keypad->direct_key_mask; 549 else 550 new_state = KPDK_DK(kpdk) & keypad->direct_key_mask; 551 552 bits_changed = keypad->direct_key_state ^ new_state; 553 554 if (bits_changed == 0) 555 return; 556 557 for (i = 0; i < pdata->direct_key_num; i++) { 558 if (bits_changed & (1 << i)) { 559 int code = MAX_MATRIX_KEY_NUM + i; 560 561 input_event(input_dev, EV_MSC, MSC_SCAN, code); 562 input_report_key(input_dev, keypad->keycodes[code], 563 new_state & (1 << i)); 564 } 565 } 566 input_sync(input_dev); 567 keypad->direct_key_state = new_state; 568 } 569 570 static void clear_wakeup_event(struct pxa27x_keypad *keypad) 571 { 572 const struct pxa27x_keypad_platform_data *pdata = keypad->pdata; 573 574 if (pdata->clear_wakeup_event) 575 (pdata->clear_wakeup_event)(); 576 } 577 578 static irqreturn_t pxa27x_keypad_irq_handler(int irq, void *dev_id) 579 { 580 struct pxa27x_keypad *keypad = dev_id; 581 unsigned long kpc = keypad_readl(KPC); 582 583 clear_wakeup_event(keypad); 584 585 if (kpc & KPC_DI) 586 pxa27x_keypad_scan_direct(keypad); 587 588 if (kpc & KPC_MI) 589 pxa27x_keypad_scan_matrix(keypad); 590 591 return IRQ_HANDLED; 592 } 593 594 static void pxa27x_keypad_config(struct pxa27x_keypad *keypad) 595 { 596 const struct pxa27x_keypad_platform_data *pdata = keypad->pdata; 597 unsigned int mask = 0, direct_key_num = 0; 598 unsigned long kpc = 0; 599 600 /* clear pending interrupt bit */ 601 keypad_readl(KPC); 602 603 /* enable matrix keys with automatic scan */ 604 if (pdata->matrix_key_rows && pdata->matrix_key_cols) { 605 kpc |= KPC_ASACT | KPC_MIE | KPC_ME | KPC_MS_ALL; 606 kpc |= KPC_MKRN(pdata->matrix_key_rows) | 607 KPC_MKCN(pdata->matrix_key_cols); 608 } 609 610 /* enable rotary key, debounce interval same as direct keys */ 611 if (pdata->enable_rotary0) { 612 mask |= 0x03; 613 direct_key_num = 2; 614 kpc |= KPC_REE0; 615 } 616 617 if (pdata->enable_rotary1) { 618 mask |= 0x0c; 619 direct_key_num = 4; 620 kpc |= KPC_REE1; 621 } 622 623 if (pdata->direct_key_num > direct_key_num) 624 direct_key_num = pdata->direct_key_num; 625 626 /* 627 * Direct keys usage may not start from KP_DKIN0, check the platfrom 628 * mask data to config the specific. 629 */ 630 if (pdata->direct_key_mask) 631 keypad->direct_key_mask = pdata->direct_key_mask; 632 else 633 keypad->direct_key_mask = ((1 << direct_key_num) - 1) & ~mask; 634 635 /* enable direct key */ 636 if (direct_key_num) 637 kpc |= KPC_DE | KPC_DIE | KPC_DKN(direct_key_num); 638 639 keypad_writel(KPC, kpc | KPC_RE_ZERO_DEB); 640 keypad_writel(KPREC, DEFAULT_KPREC); 641 keypad_writel(KPKDI, pdata->debounce_interval); 642 } 643 644 static int pxa27x_keypad_open(struct input_dev *dev) 645 { 646 struct pxa27x_keypad *keypad = input_get_drvdata(dev); 647 648 /* Enable unit clock */ 649 clk_prepare_enable(keypad->clk); 650 pxa27x_keypad_config(keypad); 651 652 return 0; 653 } 654 655 static void pxa27x_keypad_close(struct input_dev *dev) 656 { 657 struct pxa27x_keypad *keypad = input_get_drvdata(dev); 658 659 /* Disable clock unit */ 660 clk_disable_unprepare(keypad->clk); 661 } 662 663 #ifdef CONFIG_PM_SLEEP 664 static int pxa27x_keypad_suspend(struct device *dev) 665 { 666 struct platform_device *pdev = to_platform_device(dev); 667 struct pxa27x_keypad *keypad = platform_get_drvdata(pdev); 668 669 /* 670 * If the keypad is used a wake up source, clock can not be disabled. 671 * Or it can not detect the key pressing. 672 */ 673 if (device_may_wakeup(&pdev->dev)) 674 enable_irq_wake(keypad->irq); 675 else 676 clk_disable_unprepare(keypad->clk); 677 678 return 0; 679 } 680 681 static int pxa27x_keypad_resume(struct device *dev) 682 { 683 struct platform_device *pdev = to_platform_device(dev); 684 struct pxa27x_keypad *keypad = platform_get_drvdata(pdev); 685 struct input_dev *input_dev = keypad->input_dev; 686 687 /* 688 * If the keypad is used as wake up source, the clock is not turned 689 * off. So do not need configure it again. 690 */ 691 if (device_may_wakeup(&pdev->dev)) { 692 disable_irq_wake(keypad->irq); 693 } else { 694 mutex_lock(&input_dev->mutex); 695 696 if (input_dev->users) { 697 /* Enable unit clock */ 698 clk_prepare_enable(keypad->clk); 699 pxa27x_keypad_config(keypad); 700 } 701 702 mutex_unlock(&input_dev->mutex); 703 } 704 705 return 0; 706 } 707 #endif 708 709 static SIMPLE_DEV_PM_OPS(pxa27x_keypad_pm_ops, 710 pxa27x_keypad_suspend, pxa27x_keypad_resume); 711 712 713 static int pxa27x_keypad_probe(struct platform_device *pdev) 714 { 715 const struct pxa27x_keypad_platform_data *pdata = 716 dev_get_platdata(&pdev->dev); 717 struct device_node *np = pdev->dev.of_node; 718 struct pxa27x_keypad *keypad; 719 struct input_dev *input_dev; 720 struct resource *res; 721 int irq, error; 722 723 /* Driver need build keycode from device tree or pdata */ 724 if (!np && !pdata) 725 return -EINVAL; 726 727 irq = platform_get_irq(pdev, 0); 728 if (irq < 0) { 729 dev_err(&pdev->dev, "failed to get keypad irq\n"); 730 return -ENXIO; 731 } 732 733 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 734 if (res == NULL) { 735 dev_err(&pdev->dev, "failed to get I/O memory\n"); 736 return -ENXIO; 737 } 738 739 keypad = devm_kzalloc(&pdev->dev, sizeof(*keypad), 740 GFP_KERNEL); 741 if (!keypad) 742 return -ENOMEM; 743 744 input_dev = devm_input_allocate_device(&pdev->dev); 745 if (!input_dev) 746 return -ENOMEM; 747 748 keypad->pdata = pdata; 749 keypad->input_dev = input_dev; 750 keypad->irq = irq; 751 752 keypad->mmio_base = devm_ioremap_resource(&pdev->dev, res); 753 if (IS_ERR(keypad->mmio_base)) 754 return PTR_ERR(keypad->mmio_base); 755 756 keypad->clk = devm_clk_get(&pdev->dev, NULL); 757 if (IS_ERR(keypad->clk)) { 758 dev_err(&pdev->dev, "failed to get keypad clock\n"); 759 return PTR_ERR(keypad->clk); 760 } 761 762 input_dev->name = pdev->name; 763 input_dev->id.bustype = BUS_HOST; 764 input_dev->open = pxa27x_keypad_open; 765 input_dev->close = pxa27x_keypad_close; 766 input_dev->dev.parent = &pdev->dev; 767 768 input_dev->keycode = keypad->keycodes; 769 input_dev->keycodesize = sizeof(keypad->keycodes[0]); 770 input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes); 771 772 input_set_drvdata(input_dev, keypad); 773 774 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP); 775 input_set_capability(input_dev, EV_MSC, MSC_SCAN); 776 777 if (pdata) { 778 error = pxa27x_keypad_build_keycode(keypad); 779 } else { 780 error = pxa27x_keypad_build_keycode_from_dt(keypad); 781 /* 782 * Data that we get from DT resides in dynamically 783 * allocated memory so we need to update our pdata 784 * pointer. 785 */ 786 pdata = keypad->pdata; 787 } 788 if (error) { 789 dev_err(&pdev->dev, "failed to build keycode\n"); 790 return error; 791 } 792 793 keypad->row_shift = get_count_order(pdata->matrix_key_cols); 794 795 if ((pdata->enable_rotary0 && keypad->rotary_rel_code[0] != -1) || 796 (pdata->enable_rotary1 && keypad->rotary_rel_code[1] != -1)) { 797 input_dev->evbit[0] |= BIT_MASK(EV_REL); 798 } 799 800 error = devm_request_irq(&pdev->dev, irq, pxa27x_keypad_irq_handler, 801 0, pdev->name, keypad); 802 if (error) { 803 dev_err(&pdev->dev, "failed to request IRQ\n"); 804 return error; 805 } 806 807 /* Register the input device */ 808 error = input_register_device(input_dev); 809 if (error) { 810 dev_err(&pdev->dev, "failed to register input device\n"); 811 return error; 812 } 813 814 platform_set_drvdata(pdev, keypad); 815 device_init_wakeup(&pdev->dev, 1); 816 817 return 0; 818 } 819 820 #ifdef CONFIG_OF 821 static const struct of_device_id pxa27x_keypad_dt_match[] = { 822 { .compatible = "marvell,pxa27x-keypad" }, 823 {}, 824 }; 825 MODULE_DEVICE_TABLE(of, pxa27x_keypad_dt_match); 826 #endif 827 828 static struct platform_driver pxa27x_keypad_driver = { 829 .probe = pxa27x_keypad_probe, 830 .driver = { 831 .name = "pxa27x-keypad", 832 .of_match_table = of_match_ptr(pxa27x_keypad_dt_match), 833 .pm = &pxa27x_keypad_pm_ops, 834 }, 835 }; 836 module_platform_driver(pxa27x_keypad_driver); 837 838 MODULE_DESCRIPTION("PXA27x Keypad Controller Driver"); 839 MODULE_LICENSE("GPL"); 840 /* work with hotplug and coldplug */ 841 MODULE_ALIAS("platform:pxa27x-keypad"); 842