Alberto Panizzo | 76cdc08 | 2010-01-31 17:52:07 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Driver for the IMX keypad port. |
| 3 | * Copyright (C) 2009 Alberto Panizzo <maramaopercheseimorto@gmail.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License version 2 as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | * <<Power management needs to be implemented>>. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/clk.h> |
| 13 | #include <linux/delay.h> |
| 14 | #include <linux/device.h> |
| 15 | #include <linux/err.h> |
| 16 | #include <linux/init.h> |
| 17 | #include <linux/input/matrix_keypad.h> |
| 18 | #include <linux/interrupt.h> |
| 19 | #include <linux/io.h> |
| 20 | #include <linux/jiffies.h> |
| 21 | #include <linux/kernel.h> |
| 22 | #include <linux/module.h> |
| 23 | #include <linux/platform_device.h> |
| 24 | #include <linux/timer.h> |
| 25 | |
| 26 | /* |
| 27 | * Keypad Controller registers (halfword) |
| 28 | */ |
| 29 | #define KPCR 0x00 /* Keypad Control Register */ |
| 30 | |
| 31 | #define KPSR 0x02 /* Keypad Status Register */ |
| 32 | #define KBD_STAT_KPKD (0x1 << 0) /* Key Press Interrupt Status bit (w1c) */ |
| 33 | #define KBD_STAT_KPKR (0x1 << 1) /* Key Release Interrupt Status bit (w1c) */ |
| 34 | #define KBD_STAT_KDSC (0x1 << 2) /* Key Depress Synch Chain Status bit (w1c)*/ |
| 35 | #define KBD_STAT_KRSS (0x1 << 3) /* Key Release Synch Status bit (w1c)*/ |
| 36 | #define KBD_STAT_KDIE (0x1 << 8) /* Key Depress Interrupt Enable Status bit */ |
| 37 | #define KBD_STAT_KRIE (0x1 << 9) /* Key Release Interrupt Enable */ |
| 38 | #define KBD_STAT_KPPEN (0x1 << 10) /* Keypad Clock Enable */ |
| 39 | |
| 40 | #define KDDR 0x04 /* Keypad Data Direction Register */ |
| 41 | #define KPDR 0x06 /* Keypad Data Register */ |
| 42 | |
| 43 | #define MAX_MATRIX_KEY_ROWS 8 |
| 44 | #define MAX_MATRIX_KEY_COLS 8 |
| 45 | #define MATRIX_ROW_SHIFT 3 |
| 46 | |
| 47 | #define MAX_MATRIX_KEY_NUM (MAX_MATRIX_KEY_ROWS * MAX_MATRIX_KEY_COLS) |
| 48 | |
| 49 | struct imx_keypad { |
| 50 | |
| 51 | struct clk *clk; |
| 52 | struct input_dev *input_dev; |
| 53 | void __iomem *mmio_base; |
| 54 | |
| 55 | int irq; |
| 56 | struct timer_list check_matrix_timer; |
| 57 | |
| 58 | /* |
| 59 | * The matrix is stable only if no changes are detected after |
| 60 | * IMX_KEYPAD_SCANS_FOR_STABILITY scans |
| 61 | */ |
| 62 | #define IMX_KEYPAD_SCANS_FOR_STABILITY 3 |
| 63 | int stable_count; |
| 64 | |
| 65 | bool enabled; |
| 66 | |
| 67 | /* Masks for enabled rows/cols */ |
| 68 | unsigned short rows_en_mask; |
| 69 | unsigned short cols_en_mask; |
| 70 | |
| 71 | unsigned short keycodes[MAX_MATRIX_KEY_NUM]; |
| 72 | |
| 73 | /* |
| 74 | * Matrix states: |
| 75 | * -stable: achieved after a complete debounce process. |
| 76 | * -unstable: used in the debouncing process. |
| 77 | */ |
| 78 | unsigned short matrix_stable_state[MAX_MATRIX_KEY_COLS]; |
| 79 | unsigned short matrix_unstable_state[MAX_MATRIX_KEY_COLS]; |
| 80 | }; |
| 81 | |
| 82 | /* Scan the matrix and return the new state in *matrix_volatile_state. */ |
| 83 | static void imx_keypad_scan_matrix(struct imx_keypad *keypad, |
| 84 | unsigned short *matrix_volatile_state) |
| 85 | { |
| 86 | int col; |
| 87 | unsigned short reg_val; |
| 88 | |
| 89 | for (col = 0; col < MAX_MATRIX_KEY_COLS; col++) { |
| 90 | if ((keypad->cols_en_mask & (1 << col)) == 0) |
| 91 | continue; |
| 92 | /* |
| 93 | * Discharge keypad capacitance: |
| 94 | * 2. write 1s on column data. |
| 95 | * 3. configure columns as totem-pole to discharge capacitance. |
| 96 | * 4. configure columns as open-drain. |
| 97 | */ |
| 98 | reg_val = readw(keypad->mmio_base + KPDR); |
| 99 | reg_val |= 0xff00; |
| 100 | writew(reg_val, keypad->mmio_base + KPDR); |
| 101 | |
| 102 | reg_val = readw(keypad->mmio_base + KPCR); |
| 103 | reg_val &= ~((keypad->cols_en_mask & 0xff) << 8); |
| 104 | writew(reg_val, keypad->mmio_base + KPCR); |
| 105 | |
| 106 | udelay(2); |
| 107 | |
| 108 | reg_val = readw(keypad->mmio_base + KPCR); |
| 109 | reg_val |= (keypad->cols_en_mask & 0xff) << 8; |
| 110 | writew(reg_val, keypad->mmio_base + KPCR); |
| 111 | |
| 112 | /* |
| 113 | * 5. Write a single column to 0, others to 1. |
| 114 | * 6. Sample row inputs and save data. |
| 115 | * 7. Repeat steps 2 - 6 for remaining columns. |
| 116 | */ |
| 117 | reg_val = readw(keypad->mmio_base + KPDR); |
| 118 | reg_val &= ~(1 << (8 + col)); |
| 119 | writew(reg_val, keypad->mmio_base + KPDR); |
| 120 | |
| 121 | /* |
| 122 | * Delay added to avoid propagating the 0 from column to row |
| 123 | * when scanning. |
| 124 | */ |
| 125 | udelay(5); |
| 126 | |
| 127 | /* |
| 128 | * 1s in matrix_volatile_state[col] means key pressures |
| 129 | * throw data from non enabled rows. |
| 130 | */ |
| 131 | reg_val = readw(keypad->mmio_base + KPDR); |
| 132 | matrix_volatile_state[col] = (~reg_val) & keypad->rows_en_mask; |
| 133 | } |
| 134 | |
| 135 | /* |
| 136 | * Return in standby mode: |
| 137 | * 9. write 0s to columns |
| 138 | */ |
| 139 | reg_val = readw(keypad->mmio_base + KPDR); |
| 140 | reg_val &= 0x00ff; |
| 141 | writew(reg_val, keypad->mmio_base + KPDR); |
| 142 | } |
| 143 | |
| 144 | /* |
| 145 | * Compare the new matrix state (volatile) with the stable one stored in |
| 146 | * keypad->matrix_stable_state and fire events if changes are detected. |
| 147 | */ |
| 148 | static void imx_keypad_fire_events(struct imx_keypad *keypad, |
| 149 | unsigned short *matrix_volatile_state) |
| 150 | { |
| 151 | struct input_dev *input_dev = keypad->input_dev; |
| 152 | int row, col; |
| 153 | |
| 154 | for (col = 0; col < MAX_MATRIX_KEY_COLS; col++) { |
| 155 | unsigned short bits_changed; |
| 156 | int code; |
| 157 | |
| 158 | if ((keypad->cols_en_mask & (1 << col)) == 0) |
| 159 | continue; /* Column is not enabled */ |
| 160 | |
| 161 | bits_changed = keypad->matrix_stable_state[col] ^ |
| 162 | matrix_volatile_state[col]; |
| 163 | |
| 164 | if (bits_changed == 0) |
| 165 | continue; /* Column does not contain changes */ |
| 166 | |
| 167 | for (row = 0; row < MAX_MATRIX_KEY_ROWS; row++) { |
| 168 | if ((keypad->rows_en_mask & (1 << row)) == 0) |
| 169 | continue; /* Row is not enabled */ |
| 170 | if ((bits_changed & (1 << row)) == 0) |
| 171 | continue; /* Row does not contain changes */ |
| 172 | |
| 173 | code = MATRIX_SCAN_CODE(row, col, MATRIX_ROW_SHIFT); |
| 174 | input_event(input_dev, EV_MSC, MSC_SCAN, code); |
| 175 | input_report_key(input_dev, keypad->keycodes[code], |
| 176 | matrix_volatile_state[col] & (1 << row)); |
| 177 | dev_dbg(&input_dev->dev, "Event code: %d, val: %d", |
| 178 | keypad->keycodes[code], |
| 179 | matrix_volatile_state[col] & (1 << row)); |
| 180 | } |
| 181 | } |
| 182 | input_sync(input_dev); |
| 183 | } |
| 184 | |
| 185 | /* |
| 186 | * imx_keypad_check_for_events is the timer handler. |
| 187 | */ |
| 188 | static void imx_keypad_check_for_events(unsigned long data) |
| 189 | { |
| 190 | struct imx_keypad *keypad = (struct imx_keypad *) data; |
| 191 | unsigned short matrix_volatile_state[MAX_MATRIX_KEY_COLS]; |
| 192 | unsigned short reg_val; |
| 193 | bool state_changed, is_zero_matrix; |
| 194 | int i; |
| 195 | |
| 196 | memset(matrix_volatile_state, 0, sizeof(matrix_volatile_state)); |
| 197 | |
| 198 | imx_keypad_scan_matrix(keypad, matrix_volatile_state); |
| 199 | |
| 200 | state_changed = false; |
| 201 | for (i = 0; i < MAX_MATRIX_KEY_COLS; i++) { |
| 202 | if ((keypad->cols_en_mask & (1 << i)) == 0) |
| 203 | continue; |
| 204 | |
| 205 | if (keypad->matrix_unstable_state[i] ^ matrix_volatile_state[i]) { |
| 206 | state_changed = true; |
| 207 | break; |
| 208 | } |
| 209 | } |
| 210 | |
| 211 | /* |
| 212 | * If the matrix state is changed from the previous scan |
| 213 | * (Re)Begin the debouncing process, saving the new state in |
| 214 | * keypad->matrix_unstable_state. |
| 215 | * else |
| 216 | * Increase the count of number of scans with a stable state. |
| 217 | */ |
| 218 | if (state_changed) { |
| 219 | memcpy(keypad->matrix_unstable_state, matrix_volatile_state, |
| 220 | sizeof(matrix_volatile_state)); |
| 221 | keypad->stable_count = 0; |
| 222 | } else |
| 223 | keypad->stable_count++; |
| 224 | |
| 225 | /* |
| 226 | * If the matrix is not as stable as we want reschedule scan |
| 227 | * in the near future. |
| 228 | */ |
| 229 | if (keypad->stable_count < IMX_KEYPAD_SCANS_FOR_STABILITY) { |
| 230 | mod_timer(&keypad->check_matrix_timer, |
| 231 | jiffies + msecs_to_jiffies(10)); |
| 232 | return; |
| 233 | } |
| 234 | |
| 235 | /* |
| 236 | * If the matrix state is stable, fire the events and save the new |
| 237 | * stable state. Note, if the matrix is kept stable for longer |
| 238 | * (keypad->stable_count > IMX_KEYPAD_SCANS_FOR_STABILITY) all |
| 239 | * events have already been generated. |
| 240 | */ |
| 241 | if (keypad->stable_count == IMX_KEYPAD_SCANS_FOR_STABILITY) { |
| 242 | imx_keypad_fire_events(keypad, matrix_volatile_state); |
| 243 | |
| 244 | memcpy(keypad->matrix_stable_state, matrix_volatile_state, |
| 245 | sizeof(matrix_volatile_state)); |
| 246 | } |
| 247 | |
| 248 | is_zero_matrix = true; |
| 249 | for (i = 0; i < MAX_MATRIX_KEY_COLS; i++) { |
| 250 | if (matrix_volatile_state[i] != 0) { |
| 251 | is_zero_matrix = false; |
| 252 | break; |
| 253 | } |
| 254 | } |
| 255 | |
| 256 | |
| 257 | if (is_zero_matrix) { |
| 258 | /* |
| 259 | * All keys have been released. Enable only the KDI |
| 260 | * interrupt for future key presses (clear the KDI |
| 261 | * status bit and its sync chain before that). |
| 262 | */ |
| 263 | reg_val = readw(keypad->mmio_base + KPSR); |
| 264 | reg_val |= KBD_STAT_KPKD | KBD_STAT_KDSC; |
| 265 | writew(reg_val, keypad->mmio_base + KPSR); |
| 266 | |
| 267 | reg_val = readw(keypad->mmio_base + KPSR); |
| 268 | reg_val |= KBD_STAT_KDIE; |
| 269 | reg_val &= ~KBD_STAT_KRIE; |
| 270 | writew(reg_val, keypad->mmio_base + KPSR); |
| 271 | } else { |
| 272 | /* |
| 273 | * Some keys are still pressed. Schedule a rescan in |
| 274 | * attempt to detect multiple key presses and enable |
| 275 | * the KRI interrupt to react quickly to key release |
| 276 | * event. |
| 277 | */ |
| 278 | mod_timer(&keypad->check_matrix_timer, |
| 279 | jiffies + msecs_to_jiffies(60)); |
| 280 | |
| 281 | reg_val = readw(keypad->mmio_base + KPSR); |
| 282 | reg_val |= KBD_STAT_KPKR | KBD_STAT_KRSS; |
| 283 | writew(reg_val, keypad->mmio_base + KPSR); |
| 284 | |
| 285 | reg_val = readw(keypad->mmio_base + KPSR); |
| 286 | reg_val |= KBD_STAT_KRIE; |
| 287 | reg_val &= ~KBD_STAT_KDIE; |
| 288 | writew(reg_val, keypad->mmio_base + KPSR); |
| 289 | } |
| 290 | } |
| 291 | |
| 292 | static irqreturn_t imx_keypad_irq_handler(int irq, void *dev_id) |
| 293 | { |
| 294 | struct imx_keypad *keypad = dev_id; |
| 295 | unsigned short reg_val; |
| 296 | |
| 297 | reg_val = readw(keypad->mmio_base + KPSR); |
| 298 | |
| 299 | /* Disable both interrupt types */ |
| 300 | reg_val &= ~(KBD_STAT_KRIE | KBD_STAT_KDIE); |
| 301 | /* Clear interrupts status bits */ |
| 302 | reg_val |= KBD_STAT_KPKR | KBD_STAT_KPKD; |
| 303 | writew(reg_val, keypad->mmio_base + KPSR); |
| 304 | |
| 305 | if (keypad->enabled) { |
| 306 | /* The matrix is supposed to be changed */ |
| 307 | keypad->stable_count = 0; |
| 308 | |
| 309 | /* Schedule the scanning procedure near in the future */ |
| 310 | mod_timer(&keypad->check_matrix_timer, |
| 311 | jiffies + msecs_to_jiffies(2)); |
| 312 | } |
| 313 | |
| 314 | return IRQ_HANDLED; |
| 315 | } |
| 316 | |
| 317 | static void imx_keypad_config(struct imx_keypad *keypad) |
| 318 | { |
| 319 | unsigned short reg_val; |
| 320 | |
| 321 | /* |
| 322 | * Include enabled rows in interrupt generation (KPCR[7:0]) |
| 323 | * Configure keypad columns as open-drain (KPCR[15:8]) |
| 324 | */ |
| 325 | reg_val = readw(keypad->mmio_base + KPCR); |
| 326 | reg_val |= keypad->rows_en_mask & 0xff; /* rows */ |
| 327 | reg_val |= (keypad->cols_en_mask & 0xff) << 8; /* cols */ |
| 328 | writew(reg_val, keypad->mmio_base + KPCR); |
| 329 | |
| 330 | /* Write 0's to KPDR[15:8] (Colums) */ |
| 331 | reg_val = readw(keypad->mmio_base + KPDR); |
| 332 | reg_val &= 0x00ff; |
| 333 | writew(reg_val, keypad->mmio_base + KPDR); |
| 334 | |
| 335 | /* Configure columns as output, rows as input (KDDR[15:0]) */ |
| 336 | writew(0xff00, keypad->mmio_base + KDDR); |
| 337 | |
| 338 | /* |
| 339 | * Clear Key Depress and Key Release status bit. |
| 340 | * Clear both synchronizer chain. |
| 341 | */ |
| 342 | reg_val = readw(keypad->mmio_base + KPSR); |
| 343 | reg_val |= KBD_STAT_KPKR | KBD_STAT_KPKD | |
| 344 | KBD_STAT_KDSC | KBD_STAT_KRSS; |
| 345 | writew(reg_val, keypad->mmio_base + KPSR); |
| 346 | |
| 347 | /* Enable KDI and disable KRI (avoid false release events). */ |
| 348 | reg_val |= KBD_STAT_KDIE; |
| 349 | reg_val &= ~KBD_STAT_KRIE; |
| 350 | writew(reg_val, keypad->mmio_base + KPSR); |
| 351 | } |
| 352 | |
| 353 | static void imx_keypad_inhibit(struct imx_keypad *keypad) |
| 354 | { |
| 355 | unsigned short reg_val; |
| 356 | |
| 357 | /* Inhibit KDI and KRI interrupts. */ |
| 358 | reg_val = readw(keypad->mmio_base + KPSR); |
| 359 | reg_val &= ~(KBD_STAT_KRIE | KBD_STAT_KDIE); |
| 360 | writew(reg_val, keypad->mmio_base + KPSR); |
| 361 | |
| 362 | /* Colums as open drain and disable all rows */ |
| 363 | writew(0xff00, keypad->mmio_base + KPCR); |
| 364 | } |
| 365 | |
| 366 | static void imx_keypad_close(struct input_dev *dev) |
| 367 | { |
| 368 | struct imx_keypad *keypad = input_get_drvdata(dev); |
| 369 | |
| 370 | dev_dbg(&dev->dev, ">%s\n", __func__); |
| 371 | |
| 372 | /* Mark keypad as being inactive */ |
| 373 | keypad->enabled = false; |
| 374 | synchronize_irq(keypad->irq); |
| 375 | del_timer_sync(&keypad->check_matrix_timer); |
| 376 | |
| 377 | imx_keypad_inhibit(keypad); |
| 378 | |
| 379 | /* Disable clock unit */ |
| 380 | clk_disable(keypad->clk); |
| 381 | } |
| 382 | |
| 383 | static int imx_keypad_open(struct input_dev *dev) |
| 384 | { |
| 385 | struct imx_keypad *keypad = input_get_drvdata(dev); |
| 386 | |
| 387 | dev_dbg(&dev->dev, ">%s\n", __func__); |
| 388 | |
| 389 | /* We became active from now */ |
| 390 | keypad->enabled = true; |
| 391 | |
| 392 | /* Enable the kpp clock */ |
| 393 | clk_enable(keypad->clk); |
| 394 | imx_keypad_config(keypad); |
| 395 | |
| 396 | /* Sanity control, not all the rows must be actived now. */ |
| 397 | if ((readw(keypad->mmio_base + KPDR) & keypad->rows_en_mask) == 0) { |
| 398 | dev_err(&dev->dev, |
| 399 | "too many keys pressed, control pins initialisation\n"); |
| 400 | goto open_err; |
| 401 | } |
| 402 | |
| 403 | return 0; |
| 404 | |
| 405 | open_err: |
| 406 | imx_keypad_close(dev); |
| 407 | return -EIO; |
| 408 | } |
| 409 | |
| 410 | static int __devinit imx_keypad_probe(struct platform_device *pdev) |
| 411 | { |
| 412 | const struct matrix_keymap_data *keymap_data = pdev->dev.platform_data; |
| 413 | struct imx_keypad *keypad; |
| 414 | struct input_dev *input_dev; |
| 415 | struct resource *res; |
| 416 | int irq, error, i; |
| 417 | |
| 418 | if (keymap_data == NULL) { |
| 419 | dev_err(&pdev->dev, "no keymap defined\n"); |
| 420 | return -EINVAL; |
| 421 | } |
| 422 | |
| 423 | irq = platform_get_irq(pdev, 0); |
| 424 | if (irq < 0) { |
| 425 | dev_err(&pdev->dev, "no irq defined in platform data\n"); |
| 426 | return -EINVAL; |
| 427 | } |
| 428 | |
| 429 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 430 | if (res == NULL) { |
| 431 | dev_err(&pdev->dev, "no I/O memory defined in platform data\n"); |
| 432 | return -EINVAL; |
| 433 | } |
| 434 | |
| 435 | res = request_mem_region(res->start, resource_size(res), pdev->name); |
| 436 | if (res == NULL) { |
| 437 | dev_err(&pdev->dev, "failed to request I/O memory\n"); |
| 438 | return -EBUSY; |
| 439 | } |
| 440 | |
| 441 | input_dev = input_allocate_device(); |
| 442 | if (!input_dev) { |
| 443 | dev_err(&pdev->dev, "failed to allocate the input device\n"); |
| 444 | error = -ENOMEM; |
| 445 | goto failed_rel_mem; |
| 446 | } |
| 447 | |
| 448 | keypad = kzalloc(sizeof(struct imx_keypad), GFP_KERNEL); |
| 449 | if (!keypad) { |
| 450 | dev_err(&pdev->dev, "not enough memory for driver data\n"); |
| 451 | error = -ENOMEM; |
| 452 | goto failed_free_input; |
| 453 | } |
| 454 | |
| 455 | keypad->input_dev = input_dev; |
| 456 | keypad->irq = irq; |
| 457 | keypad->stable_count = 0; |
| 458 | |
| 459 | setup_timer(&keypad->check_matrix_timer, |
| 460 | imx_keypad_check_for_events, (unsigned long) keypad); |
| 461 | |
| 462 | keypad->mmio_base = ioremap(res->start, resource_size(res)); |
| 463 | if (keypad->mmio_base == NULL) { |
| 464 | dev_err(&pdev->dev, "failed to remap I/O memory\n"); |
| 465 | error = -ENOMEM; |
| 466 | goto failed_free_priv; |
| 467 | } |
| 468 | |
| 469 | keypad->clk = clk_get(&pdev->dev, "kpp"); |
| 470 | if (IS_ERR(keypad->clk)) { |
| 471 | dev_err(&pdev->dev, "failed to get keypad clock\n"); |
| 472 | error = PTR_ERR(keypad->clk); |
| 473 | goto failed_unmap; |
| 474 | } |
| 475 | |
| 476 | /* Search for rows and cols enabled */ |
| 477 | for (i = 0; i < keymap_data->keymap_size; i++) { |
| 478 | keypad->rows_en_mask |= 1 << KEY_ROW(keymap_data->keymap[i]); |
| 479 | keypad->cols_en_mask |= 1 << KEY_COL(keymap_data->keymap[i]); |
| 480 | } |
| 481 | |
| 482 | if (keypad->rows_en_mask > ((1 << MAX_MATRIX_KEY_ROWS) - 1) || |
| 483 | keypad->cols_en_mask > ((1 << MAX_MATRIX_KEY_COLS) - 1)) { |
| 484 | dev_err(&pdev->dev, |
| 485 | "invalid key data (too many rows or colums)\n"); |
| 486 | error = -EINVAL; |
| 487 | goto failed_clock_put; |
| 488 | } |
| 489 | dev_dbg(&pdev->dev, "enabled rows mask: %x\n", keypad->rows_en_mask); |
| 490 | dev_dbg(&pdev->dev, "enabled cols mask: %x\n", keypad->cols_en_mask); |
| 491 | |
| 492 | /* Init the Input device */ |
| 493 | input_dev->name = pdev->name; |
| 494 | input_dev->id.bustype = BUS_HOST; |
| 495 | input_dev->dev.parent = &pdev->dev; |
| 496 | input_dev->open = imx_keypad_open; |
| 497 | input_dev->close = imx_keypad_close; |
| 498 | input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP); |
| 499 | input_dev->keycode = keypad->keycodes; |
| 500 | input_dev->keycodesize = sizeof(keypad->keycodes[0]); |
| 501 | input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes); |
| 502 | |
| 503 | matrix_keypad_build_keymap(keymap_data, MATRIX_ROW_SHIFT, |
| 504 | keypad->keycodes, input_dev->keybit); |
| 505 | |
| 506 | input_set_capability(input_dev, EV_MSC, MSC_SCAN); |
| 507 | input_set_drvdata(input_dev, keypad); |
| 508 | |
| 509 | /* Ensure that the keypad will stay dormant until opened */ |
| 510 | imx_keypad_inhibit(keypad); |
| 511 | |
| 512 | error = request_irq(irq, imx_keypad_irq_handler, IRQF_DISABLED, |
| 513 | pdev->name, keypad); |
| 514 | if (error) { |
| 515 | dev_err(&pdev->dev, "failed to request IRQ\n"); |
| 516 | goto failed_clock_put; |
| 517 | } |
| 518 | |
| 519 | /* Register the input device */ |
| 520 | error = input_register_device(input_dev); |
| 521 | if (error) { |
| 522 | dev_err(&pdev->dev, "failed to register input device\n"); |
| 523 | goto failed_free_irq; |
| 524 | } |
| 525 | |
| 526 | platform_set_drvdata(pdev, keypad); |
| 527 | device_init_wakeup(&pdev->dev, 1); |
| 528 | |
| 529 | return 0; |
| 530 | |
| 531 | failed_free_irq: |
| 532 | free_irq(irq, pdev); |
| 533 | failed_clock_put: |
| 534 | clk_put(keypad->clk); |
| 535 | failed_unmap: |
| 536 | iounmap(keypad->mmio_base); |
| 537 | failed_free_priv: |
| 538 | kfree(keypad); |
| 539 | failed_free_input: |
| 540 | input_free_device(input_dev); |
| 541 | failed_rel_mem: |
| 542 | release_mem_region(res->start, resource_size(res)); |
| 543 | return error; |
| 544 | } |
| 545 | |
| 546 | static int __devexit imx_keypad_remove(struct platform_device *pdev) |
| 547 | { |
| 548 | struct imx_keypad *keypad = platform_get_drvdata(pdev); |
| 549 | struct resource *res; |
| 550 | |
| 551 | dev_dbg(&pdev->dev, ">%s\n", __func__); |
| 552 | |
| 553 | platform_set_drvdata(pdev, NULL); |
| 554 | |
| 555 | input_unregister_device(keypad->input_dev); |
| 556 | |
| 557 | free_irq(keypad->irq, keypad); |
| 558 | clk_put(keypad->clk); |
| 559 | |
| 560 | iounmap(keypad->mmio_base); |
| 561 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 562 | release_mem_region(res->start, resource_size(res)); |
| 563 | |
| 564 | kfree(keypad); |
| 565 | |
| 566 | return 0; |
| 567 | } |
| 568 | |
| 569 | static struct platform_driver imx_keypad_driver = { |
| 570 | .driver = { |
| 571 | .name = "imx-keypad", |
| 572 | .owner = THIS_MODULE, |
| 573 | }, |
| 574 | .probe = imx_keypad_probe, |
| 575 | .remove = __devexit_p(imx_keypad_remove), |
| 576 | }; |
| 577 | |
| 578 | static int __init imx_keypad_init(void) |
| 579 | { |
| 580 | return platform_driver_register(&imx_keypad_driver); |
| 581 | } |
| 582 | |
| 583 | static void __exit imx_keypad_exit(void) |
| 584 | { |
| 585 | platform_driver_unregister(&imx_keypad_driver); |
| 586 | } |
| 587 | |
| 588 | module_init(imx_keypad_init); |
| 589 | module_exit(imx_keypad_exit); |
| 590 | |
| 591 | MODULE_AUTHOR("Alberto Panizzo <maramaopercheseimorto@gmail.com>"); |
| 592 | MODULE_DESCRIPTION("IMX Keypad Port Driver"); |
| 593 | MODULE_LICENSE("GPL v2"); |
| 594 | MODULE_ALIAS("platform:imx-keypad"); |