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/device.h> 24 #include <linux/platform_device.h> 25 #include <linux/clk.h> 26 #include <linux/err.h> 27 #include <linux/input/matrix_keypad.h> 28 #include <linux/slab.h> 29 #include <linux/of.h> 30 31 #include <asm/mach/arch.h> 32 #include <asm/mach/map.h> 33 34 #include <mach/hardware.h> 35 #include <linux/platform_data/keypad-pxa27x.h> 36 /* 37 * Keypad Controller registers 38 */ 39 #define KPC 0x0000 /* Keypad Control register */ 40 #define KPDK 0x0008 /* Keypad Direct Key register */ 41 #define KPREC 0x0010 /* Keypad Rotary Encoder register */ 42 #define KPMK 0x0018 /* Keypad Matrix Key register */ 43 #define KPAS 0x0020 /* Keypad Automatic Scan register */ 44 45 /* Keypad Automatic Scan Multiple Key Presser register 0-3 */ 46 #define KPASMKP0 0x0028 47 #define KPASMKP1 0x0030 48 #define KPASMKP2 0x0038 49 #define KPASMKP3 0x0040 50 #define KPKDI 0x0048 51 52 /* bit definitions */ 53 #define KPC_MKRN(n) ((((n) - 1) & 0x7) << 26) /* matrix key row number */ 54 #define KPC_MKCN(n) ((((n) - 1) & 0x7) << 23) /* matrix key column number */ 55 #define KPC_DKN(n) ((((n) - 1) & 0x7) << 6) /* direct key number */ 56 57 #define KPC_AS (0x1 << 30) /* Automatic Scan bit */ 58 #define KPC_ASACT (0x1 << 29) /* Automatic Scan on Activity */ 59 #define KPC_MI (0x1 << 22) /* Matrix interrupt bit */ 60 #define KPC_IMKP (0x1 << 21) /* Ignore Multiple Key Press */ 61 62 #define KPC_MS(n) (0x1 << (13 + (n))) /* Matrix scan line 'n' */ 63 #define KPC_MS_ALL (0xff << 13) 64 65 #define KPC_ME (0x1 << 12) /* Matrix Keypad Enable */ 66 #define KPC_MIE (0x1 << 11) /* Matrix Interrupt Enable */ 67 #define KPC_DK_DEB_SEL (0x1 << 9) /* Direct Keypad Debounce Select */ 68 #define KPC_DI (0x1 << 5) /* Direct key interrupt bit */ 69 #define KPC_RE_ZERO_DEB (0x1 << 4) /* Rotary Encoder Zero Debounce */ 70 #define KPC_REE1 (0x1 << 3) /* Rotary Encoder1 Enable */ 71 #define KPC_REE0 (0x1 << 2) /* Rotary Encoder0 Enable */ 72 #define KPC_DE (0x1 << 1) /* Direct Keypad Enable */ 73 #define KPC_DIE (0x1 << 0) /* Direct Keypad interrupt Enable */ 74 75 #define KPDK_DKP (0x1 << 31) 76 #define KPDK_DK(n) ((n) & 0xff) 77 78 #define KPREC_OF1 (0x1 << 31) 79 #define kPREC_UF1 (0x1 << 30) 80 #define KPREC_OF0 (0x1 << 15) 81 #define KPREC_UF0 (0x1 << 14) 82 83 #define KPREC_RECOUNT0(n) ((n) & 0xff) 84 #define KPREC_RECOUNT1(n) (((n) >> 16) & 0xff) 85 86 #define KPMK_MKP (0x1 << 31) 87 #define KPAS_SO (0x1 << 31) 88 #define KPASMKPx_SO (0x1 << 31) 89 90 #define KPAS_MUKP(n) (((n) >> 26) & 0x1f) 91 #define KPAS_RP(n) (((n) >> 4) & 0xf) 92 #define KPAS_CP(n) ((n) & 0xf) 93 94 #define KPASMKP_MKC_MASK (0xff) 95 96 #define keypad_readl(off) __raw_readl(keypad->mmio_base + (off)) 97 #define keypad_writel(off, v) __raw_writel((v), keypad->mmio_base + (off)) 98 99 #define MAX_MATRIX_KEY_NUM (MAX_MATRIX_KEY_ROWS * MAX_MATRIX_KEY_COLS) 100 #define MAX_KEYPAD_KEYS (MAX_MATRIX_KEY_NUM + MAX_DIRECT_KEY_NUM) 101 102 struct pxa27x_keypad { 103 const struct pxa27x_keypad_platform_data *pdata; 104 105 struct clk *clk; 106 struct input_dev *input_dev; 107 void __iomem *mmio_base; 108 109 int irq; 110 111 unsigned short keycodes[MAX_KEYPAD_KEYS]; 112 int rotary_rel_code[2]; 113 114 /* state row bits of each column scan */ 115 uint32_t matrix_key_state[MAX_MATRIX_KEY_COLS]; 116 uint32_t direct_key_state; 117 118 unsigned int direct_key_mask; 119 }; 120 121 #ifdef CONFIG_OF 122 static int pxa27x_keypad_matrix_key_parse_dt(struct pxa27x_keypad *keypad, 123 struct pxa27x_keypad_platform_data *pdata) 124 { 125 struct input_dev *input_dev = keypad->input_dev; 126 struct device *dev = input_dev->dev.parent; 127 u32 rows, cols; 128 int error; 129 130 error = matrix_keypad_parse_of_params(dev, &rows, &cols); 131 if (error) 132 return error; 133 134 if (rows > MAX_MATRIX_KEY_ROWS || cols > MAX_MATRIX_KEY_COLS) { 135 dev_err(dev, "rows or cols exceeds maximum value\n"); 136 return -EINVAL; 137 } 138 139 pdata->matrix_key_rows = rows; 140 pdata->matrix_key_cols = cols; 141 142 error = matrix_keypad_build_keymap(NULL, NULL, 143 pdata->matrix_key_rows, 144 pdata->matrix_key_cols, 145 keypad->keycodes, input_dev); 146 if (error) 147 return error; 148 149 return 0; 150 } 151 152 static int pxa27x_keypad_direct_key_parse_dt(struct pxa27x_keypad *keypad, 153 struct pxa27x_keypad_platform_data *pdata) 154 { 155 struct input_dev *input_dev = keypad->input_dev; 156 struct device *dev = input_dev->dev.parent; 157 struct device_node *np = dev->of_node; 158 const __be16 *prop; 159 unsigned short code; 160 unsigned int proplen, size; 161 int i; 162 int error; 163 164 error = of_property_read_u32(np, "marvell,direct-key-count", 165 &pdata->direct_key_num); 166 if (error) { 167 /* 168 * If do not have marvel,direct-key-count defined, 169 * it means direct key is not supported. 170 */ 171 return error == -EINVAL ? 0 : error; 172 } 173 174 error = of_property_read_u32(np, "marvell,direct-key-mask", 175 &pdata->direct_key_mask); 176 if (error) { 177 if (error != -EINVAL) 178 return error; 179 180 /* 181 * If marvell,direct-key-mask is not defined, driver will use 182 * default value. Default value is set when configure the keypad. 183 */ 184 pdata->direct_key_mask = 0; 185 } 186 187 pdata->direct_key_low_active = of_property_read_bool(np, 188 "marvell,direct-key-low-active"); 189 190 prop = of_get_property(np, "marvell,direct-key-map", &proplen); 191 if (!prop) 192 return -EINVAL; 193 194 if (proplen % sizeof(u16)) 195 return -EINVAL; 196 197 size = proplen / sizeof(u16); 198 199 /* Only MAX_DIRECT_KEY_NUM is accepted.*/ 200 if (size > MAX_DIRECT_KEY_NUM) 201 return -EINVAL; 202 203 for (i = 0; i < size; i++) { 204 code = be16_to_cpup(prop + i); 205 keypad->keycodes[MAX_MATRIX_KEY_NUM + i] = code; 206 __set_bit(code, input_dev->keybit); 207 } 208 209 return 0; 210 } 211 212 static int pxa27x_keypad_rotary_parse_dt(struct pxa27x_keypad *keypad, 213 struct pxa27x_keypad_platform_data *pdata) 214 { 215 const __be32 *prop; 216 int i, relkey_ret; 217 unsigned int code, proplen; 218 const char *rotaryname[2] = { 219 "marvell,rotary0", "marvell,rotary1"}; 220 const char relkeyname[] = {"marvell,rotary-rel-key"}; 221 struct input_dev *input_dev = keypad->input_dev; 222 struct device *dev = input_dev->dev.parent; 223 struct device_node *np = dev->of_node; 224 225 relkey_ret = of_property_read_u32(np, relkeyname, &code); 226 /* if can read correct rotary key-code, we do not need this. */ 227 if (relkey_ret == 0) { 228 unsigned short relcode; 229 230 /* rotary0 taks lower half, rotary1 taks upper half. */ 231 relcode = code & 0xffff; 232 pdata->rotary0_rel_code = (code & 0xffff); 233 __set_bit(relcode, input_dev->relbit); 234 235 relcode = code >> 16; 236 pdata->rotary1_rel_code = relcode; 237 __set_bit(relcode, input_dev->relbit); 238 } 239 240 for (i = 0; i < 2; i++) { 241 prop = of_get_property(np, rotaryname[i], &proplen); 242 /* 243 * If the prop is not set, it means keypad does not need 244 * initialize the rotaryX. 245 */ 246 if (!prop) 247 continue; 248 249 code = be32_to_cpup(prop); 250 /* 251 * Not all up/down key code are valid. 252 * Now we depends on direct-rel-code. 253 */ 254 if ((!(code & 0xffff) || !(code >> 16)) && relkey_ret) { 255 return relkey_ret; 256 } else { 257 unsigned int n = MAX_MATRIX_KEY_NUM + (i << 1); 258 unsigned short keycode; 259 260 keycode = code & 0xffff; 261 keypad->keycodes[n] = keycode; 262 __set_bit(keycode, input_dev->keybit); 263 264 keycode = code >> 16; 265 keypad->keycodes[n + 1] = keycode; 266 __set_bit(keycode, input_dev->keybit); 267 268 if (i == 0) 269 pdata->rotary0_rel_code = -1; 270 else 271 pdata->rotary1_rel_code = -1; 272 } 273 if (i == 0) 274 pdata->enable_rotary0 = 1; 275 else 276 pdata->enable_rotary1 = 1; 277 } 278 279 keypad->rotary_rel_code[0] = pdata->rotary0_rel_code; 280 keypad->rotary_rel_code[1] = pdata->rotary1_rel_code; 281 282 return 0; 283 } 284 285 static int pxa27x_keypad_build_keycode_from_dt(struct pxa27x_keypad *keypad) 286 { 287 struct input_dev *input_dev = keypad->input_dev; 288 struct device *dev = input_dev->dev.parent; 289 struct device_node *np = dev->of_node; 290 struct pxa27x_keypad_platform_data *pdata; 291 int error; 292 293 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); 294 if (!pdata) { 295 dev_err(dev, "failed to allocate memory for pdata\n"); 296 return -ENOMEM; 297 } 298 299 error = pxa27x_keypad_matrix_key_parse_dt(keypad, pdata); 300 if (error) { 301 dev_err(dev, "failed to parse matrix key\n"); 302 return error; 303 } 304 305 error = pxa27x_keypad_direct_key_parse_dt(keypad, pdata); 306 if (error) { 307 dev_err(dev, "failed to parse direct key\n"); 308 return error; 309 } 310 311 error = pxa27x_keypad_rotary_parse_dt(keypad, pdata); 312 if (error) { 313 dev_err(dev, "failed to parse rotary key\n"); 314 return error; 315 } 316 317 error = of_property_read_u32(np, "marvell,debounce-interval", 318 &pdata->debounce_interval); 319 if (error) { 320 dev_err(dev, "failed to parse debpunce-interval\n"); 321 return error; 322 } 323 324 /* 325 * The keycodes may not only includes matrix key but also the direct 326 * key or rotary key. 327 */ 328 input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes); 329 330 keypad->pdata = pdata; 331 return 0; 332 } 333 334 #else 335 336 static int pxa27x_keypad_build_keycode_from_dt(struct pxa27x_keypad *keypad) 337 { 338 dev_info(keypad->input_dev->dev.parent, "missing platform data\n"); 339 340 return -EINVAL; 341 } 342 343 #endif 344 345 static int pxa27x_keypad_build_keycode(struct pxa27x_keypad *keypad) 346 { 347 const struct pxa27x_keypad_platform_data *pdata = keypad->pdata; 348 struct input_dev *input_dev = keypad->input_dev; 349 const struct matrix_keymap_data *keymap_data = 350 pdata ? pdata->matrix_keymap_data : NULL; 351 unsigned short keycode; 352 int i; 353 int error; 354 355 error = matrix_keypad_build_keymap(keymap_data, NULL, 356 pdata->matrix_key_rows, 357 pdata->matrix_key_cols, 358 keypad->keycodes, input_dev); 359 if (error) 360 return error; 361 362 /* 363 * The keycodes may not only include matrix keys but also the direct 364 * or rotary keys. 365 */ 366 input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes); 367 368 /* For direct keys. */ 369 for (i = 0; i < pdata->direct_key_num; i++) { 370 keycode = pdata->direct_key_map[i]; 371 keypad->keycodes[MAX_MATRIX_KEY_NUM + i] = keycode; 372 __set_bit(keycode, input_dev->keybit); 373 } 374 375 if (pdata->enable_rotary0) { 376 if (pdata->rotary0_up_key && pdata->rotary0_down_key) { 377 keycode = pdata->rotary0_up_key; 378 keypad->keycodes[MAX_MATRIX_KEY_NUM + 0] = keycode; 379 __set_bit(keycode, input_dev->keybit); 380 381 keycode = pdata->rotary0_down_key; 382 keypad->keycodes[MAX_MATRIX_KEY_NUM + 1] = keycode; 383 __set_bit(keycode, input_dev->keybit); 384 385 keypad->rotary_rel_code[0] = -1; 386 } else { 387 keypad->rotary_rel_code[0] = pdata->rotary0_rel_code; 388 __set_bit(pdata->rotary0_rel_code, input_dev->relbit); 389 } 390 } 391 392 if (pdata->enable_rotary1) { 393 if (pdata->rotary1_up_key && pdata->rotary1_down_key) { 394 keycode = pdata->rotary1_up_key; 395 keypad->keycodes[MAX_MATRIX_KEY_NUM + 2] = keycode; 396 __set_bit(keycode, input_dev->keybit); 397 398 keycode = pdata->rotary1_down_key; 399 keypad->keycodes[MAX_MATRIX_KEY_NUM + 3] = keycode; 400 __set_bit(keycode, input_dev->keybit); 401 402 keypad->rotary_rel_code[1] = -1; 403 } else { 404 keypad->rotary_rel_code[1] = pdata->rotary1_rel_code; 405 __set_bit(pdata->rotary1_rel_code, input_dev->relbit); 406 } 407 } 408 409 __clear_bit(KEY_RESERVED, input_dev->keybit); 410 411 return 0; 412 } 413 414 static void pxa27x_keypad_scan_matrix(struct pxa27x_keypad *keypad) 415 { 416 const struct pxa27x_keypad_platform_data *pdata = keypad->pdata; 417 struct input_dev *input_dev = keypad->input_dev; 418 int row, col, num_keys_pressed = 0; 419 uint32_t new_state[MAX_MATRIX_KEY_COLS]; 420 uint32_t kpas = keypad_readl(KPAS); 421 422 num_keys_pressed = KPAS_MUKP(kpas); 423 424 memset(new_state, 0, sizeof(new_state)); 425 426 if (num_keys_pressed == 0) 427 goto scan; 428 429 if (num_keys_pressed == 1) { 430 col = KPAS_CP(kpas); 431 row = KPAS_RP(kpas); 432 433 /* if invalid row/col, treat as no key pressed */ 434 if (col >= pdata->matrix_key_cols || 435 row >= pdata->matrix_key_rows) 436 goto scan; 437 438 new_state[col] = (1 << row); 439 goto scan; 440 } 441 442 if (num_keys_pressed > 1) { 443 uint32_t kpasmkp0 = keypad_readl(KPASMKP0); 444 uint32_t kpasmkp1 = keypad_readl(KPASMKP1); 445 uint32_t kpasmkp2 = keypad_readl(KPASMKP2); 446 uint32_t kpasmkp3 = keypad_readl(KPASMKP3); 447 448 new_state[0] = kpasmkp0 & KPASMKP_MKC_MASK; 449 new_state[1] = (kpasmkp0 >> 16) & KPASMKP_MKC_MASK; 450 new_state[2] = kpasmkp1 & KPASMKP_MKC_MASK; 451 new_state[3] = (kpasmkp1 >> 16) & KPASMKP_MKC_MASK; 452 new_state[4] = kpasmkp2 & KPASMKP_MKC_MASK; 453 new_state[5] = (kpasmkp2 >> 16) & KPASMKP_MKC_MASK; 454 new_state[6] = kpasmkp3 & KPASMKP_MKC_MASK; 455 new_state[7] = (kpasmkp3 >> 16) & KPASMKP_MKC_MASK; 456 } 457 scan: 458 for (col = 0; col < pdata->matrix_key_cols; col++) { 459 uint32_t bits_changed; 460 int code; 461 462 bits_changed = keypad->matrix_key_state[col] ^ new_state[col]; 463 if (bits_changed == 0) 464 continue; 465 466 for (row = 0; row < pdata->matrix_key_rows; row++) { 467 if ((bits_changed & (1 << row)) == 0) 468 continue; 469 470 code = MATRIX_SCAN_CODE(row, col, MATRIX_ROW_SHIFT); 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 = kzalloc(sizeof(struct pxa27x_keypad), GFP_KERNEL); 742 input_dev = input_allocate_device(); 743 if (!keypad || !input_dev) { 744 dev_err(&pdev->dev, "failed to allocate memory\n"); 745 error = -ENOMEM; 746 goto failed_free; 747 } 748 749 keypad->pdata = pdata; 750 keypad->input_dev = input_dev; 751 keypad->irq = irq; 752 753 res = request_mem_region(res->start, resource_size(res), pdev->name); 754 if (res == NULL) { 755 dev_err(&pdev->dev, "failed to request I/O memory\n"); 756 error = -EBUSY; 757 goto failed_free; 758 } 759 760 keypad->mmio_base = ioremap(res->start, resource_size(res)); 761 if (keypad->mmio_base == NULL) { 762 dev_err(&pdev->dev, "failed to remap I/O memory\n"); 763 error = -ENXIO; 764 goto failed_free_mem; 765 } 766 767 keypad->clk = clk_get(&pdev->dev, NULL); 768 if (IS_ERR(keypad->clk)) { 769 dev_err(&pdev->dev, "failed to get keypad clock\n"); 770 error = PTR_ERR(keypad->clk); 771 goto failed_free_io; 772 } 773 774 input_dev->name = pdev->name; 775 input_dev->id.bustype = BUS_HOST; 776 input_dev->open = pxa27x_keypad_open; 777 input_dev->close = pxa27x_keypad_close; 778 input_dev->dev.parent = &pdev->dev; 779 780 input_dev->keycode = keypad->keycodes; 781 input_dev->keycodesize = sizeof(keypad->keycodes[0]); 782 input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes); 783 784 input_set_drvdata(input_dev, keypad); 785 786 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP); 787 input_set_capability(input_dev, EV_MSC, MSC_SCAN); 788 789 if (pdata) { 790 error = pxa27x_keypad_build_keycode(keypad); 791 } else { 792 error = pxa27x_keypad_build_keycode_from_dt(keypad); 793 /* 794 * Data that we get from DT resides in dynamically 795 * allocated memory so we need to update our pdata 796 * pointer. 797 */ 798 pdata = keypad->pdata; 799 } 800 if (error) { 801 dev_err(&pdev->dev, "failed to build keycode\n"); 802 goto failed_put_clk; 803 } 804 805 if ((pdata->enable_rotary0 && keypad->rotary_rel_code[0] != -1) || 806 (pdata->enable_rotary1 && keypad->rotary_rel_code[1] != -1)) { 807 input_dev->evbit[0] |= BIT_MASK(EV_REL); 808 } 809 810 error = request_irq(irq, pxa27x_keypad_irq_handler, 0, 811 pdev->name, keypad); 812 if (error) { 813 dev_err(&pdev->dev, "failed to request IRQ\n"); 814 goto failed_put_clk; 815 } 816 817 /* Register the input device */ 818 error = input_register_device(input_dev); 819 if (error) { 820 dev_err(&pdev->dev, "failed to register input device\n"); 821 goto failed_free_irq; 822 } 823 824 platform_set_drvdata(pdev, keypad); 825 device_init_wakeup(&pdev->dev, 1); 826 827 return 0; 828 829 failed_free_irq: 830 free_irq(irq, keypad); 831 failed_put_clk: 832 clk_put(keypad->clk); 833 failed_free_io: 834 iounmap(keypad->mmio_base); 835 failed_free_mem: 836 release_mem_region(res->start, resource_size(res)); 837 failed_free: 838 input_free_device(input_dev); 839 kfree(keypad); 840 return error; 841 } 842 843 static int pxa27x_keypad_remove(struct platform_device *pdev) 844 { 845 struct pxa27x_keypad *keypad = platform_get_drvdata(pdev); 846 struct resource *res; 847 848 free_irq(keypad->irq, keypad); 849 clk_put(keypad->clk); 850 851 input_unregister_device(keypad->input_dev); 852 iounmap(keypad->mmio_base); 853 854 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 855 release_mem_region(res->start, resource_size(res)); 856 857 kfree(keypad); 858 859 return 0; 860 } 861 862 /* work with hotplug and coldplug */ 863 MODULE_ALIAS("platform:pxa27x-keypad"); 864 865 #ifdef CONFIG_OF 866 static const struct of_device_id pxa27x_keypad_dt_match[] = { 867 { .compatible = "marvell,pxa27x-keypad" }, 868 {}, 869 }; 870 MODULE_DEVICE_TABLE(of, pxa27x_keypad_dt_match); 871 #endif 872 873 static struct platform_driver pxa27x_keypad_driver = { 874 .probe = pxa27x_keypad_probe, 875 .remove = pxa27x_keypad_remove, 876 .driver = { 877 .name = "pxa27x-keypad", 878 .of_match_table = of_match_ptr(pxa27x_keypad_dt_match), 879 .owner = THIS_MODULE, 880 .pm = &pxa27x_keypad_pm_ops, 881 }, 882 }; 883 module_platform_driver(pxa27x_keypad_driver); 884 885 MODULE_DESCRIPTION("PXA27x Keypad Controller Driver"); 886 MODULE_LICENSE("GPL"); 887