Komal Shah | ad4e09b | 2006-09-29 01:59:19 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/drivers/input/keyboard/omap-keypad.c |
| 3 | * |
| 4 | * OMAP Keypad Driver |
| 5 | * |
| 6 | * Copyright (C) 2003 Nokia Corporation |
| 7 | * Written by Timo Teräs <ext-timo.teras@nokia.com> |
| 8 | * |
| 9 | * Added support for H2 & H3 Keypad |
| 10 | * Copyright (C) 2004 Texas Instruments |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU General Public License as published by |
| 14 | * the Free Software Foundation; either version 2 of the License, or |
| 15 | * (at your option) any later version. |
| 16 | * |
| 17 | * This program is distributed in the hope that it will be useful, |
| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | * GNU General Public License for more details. |
| 21 | * |
| 22 | * You should have received a copy of the GNU General Public License |
| 23 | * along with this program; if not, write to the Free Software |
| 24 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 25 | */ |
| 26 | |
| 27 | #include <linux/module.h> |
| 28 | #include <linux/init.h> |
| 29 | #include <linux/interrupt.h> |
| 30 | #include <linux/types.h> |
| 31 | #include <linux/input.h> |
| 32 | #include <linux/kernel.h> |
| 33 | #include <linux/delay.h> |
| 34 | #include <linux/platform_device.h> |
| 35 | #include <linux/mutex.h> |
| 36 | #include <linux/errno.h> |
| 37 | #include <asm/arch/gpio.h> |
| 38 | #include <asm/arch/keypad.h> |
| 39 | #include <asm/arch/menelaus.h> |
| 40 | #include <asm/irq.h> |
| 41 | #include <asm/hardware.h> |
| 42 | #include <asm/io.h> |
| 43 | #include <asm/mach-types.h> |
| 44 | #include <asm/arch/mux.h> |
| 45 | |
| 46 | #undef NEW_BOARD_LEARNING_MODE |
| 47 | |
| 48 | static void omap_kp_tasklet(unsigned long); |
| 49 | static void omap_kp_timer(unsigned long); |
| 50 | |
| 51 | static unsigned char keypad_state[8]; |
| 52 | static DEFINE_MUTEX(kp_enable_mutex); |
| 53 | static int kp_enable = 1; |
| 54 | static int kp_cur_group = -1; |
| 55 | |
| 56 | struct omap_kp { |
| 57 | struct input_dev *input; |
| 58 | struct timer_list timer; |
| 59 | int irq; |
| 60 | unsigned int rows; |
| 61 | unsigned int cols; |
| 62 | unsigned long delay; |
| 63 | unsigned int debounce; |
| 64 | }; |
| 65 | |
| 66 | DECLARE_TASKLET_DISABLED(kp_tasklet, omap_kp_tasklet, 0); |
| 67 | |
| 68 | static int *keymap; |
| 69 | static unsigned int *row_gpios; |
| 70 | static unsigned int *col_gpios; |
| 71 | |
| 72 | #ifdef CONFIG_ARCH_OMAP2 |
| 73 | static void set_col_gpio_val(struct omap_kp *omap_kp, u8 value) |
| 74 | { |
| 75 | int col; |
| 76 | for (col = 0; col < omap_kp->cols; col++) { |
| 77 | if (value & (1 << col)) |
| 78 | omap_set_gpio_dataout(col_gpios[col], 1); |
| 79 | else |
| 80 | omap_set_gpio_dataout(col_gpios[col], 0); |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | static u8 get_row_gpio_val(struct omap_kp *omap_kp) |
| 85 | { |
| 86 | int row; |
| 87 | u8 value = 0; |
| 88 | |
| 89 | for (row = 0; row < omap_kp->rows; row++) { |
| 90 | if (omap_get_gpio_datain(row_gpios[row])) |
| 91 | value |= (1 << row); |
| 92 | } |
| 93 | return value; |
| 94 | } |
| 95 | #else |
| 96 | #define set_col_gpio_val(x, y) do {} while (0) |
| 97 | #define get_row_gpio_val(x) 0 |
| 98 | #endif |
| 99 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 100 | static irqreturn_t omap_kp_interrupt(int irq, void *dev_id) |
Komal Shah | ad4e09b | 2006-09-29 01:59:19 -0700 | [diff] [blame] | 101 | { |
| 102 | struct omap_kp *omap_kp = dev_id; |
| 103 | |
| 104 | /* disable keyboard interrupt and schedule for handling */ |
| 105 | if (cpu_is_omap24xx()) { |
| 106 | int i; |
| 107 | for (i = 0; i < omap_kp->rows; i++) |
| 108 | disable_irq(OMAP_GPIO_IRQ(row_gpios[i])); |
| 109 | } else |
| 110 | /* disable keyboard interrupt and schedule for handling */ |
| 111 | omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); |
| 112 | |
| 113 | tasklet_schedule(&kp_tasklet); |
| 114 | |
| 115 | return IRQ_HANDLED; |
| 116 | } |
| 117 | |
| 118 | static void omap_kp_timer(unsigned long data) |
| 119 | { |
| 120 | tasklet_schedule(&kp_tasklet); |
| 121 | } |
| 122 | |
| 123 | static void omap_kp_scan_keypad(struct omap_kp *omap_kp, unsigned char *state) |
| 124 | { |
| 125 | int col = 0; |
| 126 | |
| 127 | /* read the keypad status */ |
| 128 | if (cpu_is_omap24xx()) { |
| 129 | int i; |
| 130 | for (i = 0; i < omap_kp->rows; i++) |
| 131 | disable_irq(OMAP_GPIO_IRQ(row_gpios[i])); |
| 132 | |
| 133 | /* read the keypad status */ |
| 134 | for (col = 0; col < omap_kp->cols; col++) { |
| 135 | set_col_gpio_val(omap_kp, ~(1 << col)); |
| 136 | state[col] = ~(get_row_gpio_val(omap_kp)) & 0x3f; |
| 137 | } |
| 138 | set_col_gpio_val(omap_kp, 0); |
| 139 | |
| 140 | } else { |
| 141 | /* disable keyboard interrupt and schedule for handling */ |
| 142 | omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); |
| 143 | |
| 144 | /* read the keypad status */ |
| 145 | omap_writew(0xff, OMAP_MPUIO_BASE + OMAP_MPUIO_KBC); |
| 146 | for (col = 0; col < omap_kp->cols; col++) { |
| 147 | omap_writew(~(1 << col) & 0xff, |
| 148 | OMAP_MPUIO_BASE + OMAP_MPUIO_KBC); |
| 149 | |
| 150 | udelay(omap_kp->delay); |
| 151 | |
| 152 | state[col] = ~omap_readw(OMAP_MPUIO_BASE + |
| 153 | OMAP_MPUIO_KBR_LATCH) & 0xff; |
| 154 | } |
| 155 | omap_writew(0x00, OMAP_MPUIO_BASE + OMAP_MPUIO_KBC); |
| 156 | udelay(2); |
| 157 | } |
| 158 | } |
| 159 | |
| 160 | static inline int omap_kp_find_key(int col, int row) |
| 161 | { |
| 162 | int i, key; |
| 163 | |
| 164 | key = KEY(col, row, 0); |
| 165 | for (i = 0; keymap[i] != 0; i++) |
| 166 | if ((keymap[i] & 0xff000000) == key) |
| 167 | return keymap[i] & 0x00ffffff; |
| 168 | return -1; |
| 169 | } |
| 170 | |
| 171 | static void omap_kp_tasklet(unsigned long data) |
| 172 | { |
| 173 | struct omap_kp *omap_kp_data = (struct omap_kp *) data; |
| 174 | unsigned char new_state[8], changed, key_down = 0; |
| 175 | int col, row; |
| 176 | int spurious = 0; |
| 177 | |
| 178 | /* check for any changes */ |
| 179 | omap_kp_scan_keypad(omap_kp_data, new_state); |
| 180 | |
| 181 | /* check for changes and print those */ |
| 182 | for (col = 0; col < omap_kp_data->cols; col++) { |
| 183 | changed = new_state[col] ^ keypad_state[col]; |
| 184 | key_down |= new_state[col]; |
| 185 | if (changed == 0) |
| 186 | continue; |
| 187 | |
| 188 | for (row = 0; row < omap_kp_data->rows; row++) { |
| 189 | int key; |
| 190 | if (!(changed & (1 << row))) |
| 191 | continue; |
| 192 | #ifdef NEW_BOARD_LEARNING_MODE |
| 193 | printk(KERN_INFO "omap-keypad: key %d-%d %s\n", col, |
| 194 | row, (new_state[col] & (1 << row)) ? |
| 195 | "pressed" : "released"); |
| 196 | #else |
| 197 | key = omap_kp_find_key(col, row); |
| 198 | if (key < 0) { |
| 199 | printk(KERN_WARNING |
| 200 | "omap-keypad: Spurious key event %d-%d\n", |
| 201 | col, row); |
| 202 | /* We scan again after a couple of seconds */ |
| 203 | spurious = 1; |
| 204 | continue; |
| 205 | } |
| 206 | |
| 207 | if (!(kp_cur_group == (key & GROUP_MASK) || |
| 208 | kp_cur_group == -1)) |
| 209 | continue; |
| 210 | |
| 211 | kp_cur_group = key & GROUP_MASK; |
| 212 | input_report_key(omap_kp_data->input, key & ~GROUP_MASK, |
| 213 | new_state[col] & (1 << row)); |
| 214 | #endif |
| 215 | } |
| 216 | } |
| 217 | memcpy(keypad_state, new_state, sizeof(keypad_state)); |
| 218 | |
| 219 | if (key_down) { |
| 220 | int delay = HZ / 20; |
| 221 | /* some key is pressed - keep irq disabled and use timer |
| 222 | * to poll the keypad */ |
| 223 | if (spurious) |
| 224 | delay = 2 * HZ; |
| 225 | mod_timer(&omap_kp_data->timer, jiffies + delay); |
| 226 | } else { |
| 227 | /* enable interrupts */ |
| 228 | if (cpu_is_omap24xx()) { |
| 229 | int i; |
| 230 | for (i = 0; i < omap_kp_data->rows; i++) |
| 231 | enable_irq(OMAP_GPIO_IRQ(row_gpios[i])); |
| 232 | } else { |
| 233 | omap_writew(0, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); |
| 234 | kp_cur_group = -1; |
| 235 | } |
| 236 | } |
| 237 | } |
| 238 | |
| 239 | static ssize_t omap_kp_enable_show(struct device *dev, |
| 240 | struct device_attribute *attr, char *buf) |
| 241 | { |
| 242 | return sprintf(buf, "%u\n", kp_enable); |
| 243 | } |
| 244 | |
| 245 | static ssize_t omap_kp_enable_store(struct device *dev, struct device_attribute *attr, |
| 246 | const char *buf, size_t count) |
| 247 | { |
| 248 | int state; |
| 249 | |
| 250 | if (sscanf(buf, "%u", &state) != 1) |
| 251 | return -EINVAL; |
| 252 | |
| 253 | if ((state != 1) && (state != 0)) |
| 254 | return -EINVAL; |
| 255 | |
| 256 | mutex_lock(&kp_enable_mutex); |
| 257 | if (state != kp_enable) { |
| 258 | if (state) |
| 259 | enable_irq(INT_KEYBOARD); |
| 260 | else |
| 261 | disable_irq(INT_KEYBOARD); |
| 262 | kp_enable = state; |
| 263 | } |
| 264 | mutex_unlock(&kp_enable_mutex); |
| 265 | |
| 266 | return strnlen(buf, count); |
| 267 | } |
| 268 | |
| 269 | static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, omap_kp_enable_show, omap_kp_enable_store); |
| 270 | |
| 271 | #ifdef CONFIG_PM |
| 272 | static int omap_kp_suspend(struct platform_device *dev, pm_message_t state) |
| 273 | { |
| 274 | /* Nothing yet */ |
| 275 | |
| 276 | return 0; |
| 277 | } |
| 278 | |
| 279 | static int omap_kp_resume(struct platform_device *dev) |
| 280 | { |
| 281 | /* Nothing yet */ |
| 282 | |
| 283 | return 0; |
| 284 | } |
| 285 | #else |
| 286 | #define omap_kp_suspend NULL |
| 287 | #define omap_kp_resume NULL |
| 288 | #endif |
| 289 | |
| 290 | static int __init omap_kp_probe(struct platform_device *pdev) |
| 291 | { |
| 292 | struct omap_kp *omap_kp; |
| 293 | struct input_dev *input_dev; |
| 294 | struct omap_kp_platform_data *pdata = pdev->dev.platform_data; |
| 295 | int i, col_idx, row_idx, irq_idx, ret; |
| 296 | |
| 297 | if (!pdata->rows || !pdata->cols || !pdata->keymap) { |
| 298 | printk(KERN_ERR "No rows, cols or keymap from pdata\n"); |
| 299 | return -EINVAL; |
| 300 | } |
| 301 | |
| 302 | omap_kp = kzalloc(sizeof(struct omap_kp), GFP_KERNEL); |
| 303 | input_dev = input_allocate_device(); |
| 304 | if (!omap_kp || !input_dev) { |
| 305 | kfree(omap_kp); |
| 306 | input_free_device(input_dev); |
| 307 | return -ENOMEM; |
| 308 | } |
| 309 | |
| 310 | platform_set_drvdata(pdev, omap_kp); |
| 311 | |
| 312 | omap_kp->input = input_dev; |
| 313 | |
| 314 | /* Disable the interrupt for the MPUIO keyboard */ |
| 315 | if (!cpu_is_omap24xx()) |
| 316 | omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); |
| 317 | |
| 318 | keymap = pdata->keymap; |
| 319 | |
| 320 | if (pdata->rep) |
| 321 | set_bit(EV_REP, input_dev->evbit); |
| 322 | |
| 323 | if (pdata->delay) |
| 324 | omap_kp->delay = pdata->delay; |
| 325 | |
| 326 | if (pdata->row_gpios && pdata->col_gpios) { |
| 327 | row_gpios = pdata->row_gpios; |
| 328 | col_gpios = pdata->col_gpios; |
| 329 | } |
| 330 | |
| 331 | omap_kp->rows = pdata->rows; |
| 332 | omap_kp->cols = pdata->cols; |
| 333 | |
| 334 | if (cpu_is_omap24xx()) { |
| 335 | /* Cols: outputs */ |
| 336 | for (col_idx = 0; col_idx < omap_kp->cols; col_idx++) { |
| 337 | if (omap_request_gpio(col_gpios[col_idx]) < 0) { |
| 338 | printk(KERN_ERR "Failed to request" |
| 339 | "GPIO%d for keypad\n", |
| 340 | col_gpios[col_idx]); |
| 341 | goto err1; |
| 342 | } |
| 343 | omap_set_gpio_direction(col_gpios[col_idx], 0); |
| 344 | } |
| 345 | /* Rows: inputs */ |
| 346 | for (row_idx = 0; row_idx < omap_kp->rows; row_idx++) { |
| 347 | if (omap_request_gpio(row_gpios[row_idx]) < 0) { |
| 348 | printk(KERN_ERR "Failed to request" |
| 349 | "GPIO%d for keypad\n", |
| 350 | row_gpios[row_idx]); |
| 351 | goto err2; |
| 352 | } |
| 353 | omap_set_gpio_direction(row_gpios[row_idx], 1); |
| 354 | } |
| 355 | } |
| 356 | |
| 357 | setup_timer(&omap_kp->timer, omap_kp_timer, (unsigned long)omap_kp); |
| 358 | |
| 359 | /* get the irq and init timer*/ |
| 360 | tasklet_enable(&kp_tasklet); |
| 361 | kp_tasklet.data = (unsigned long) omap_kp; |
| 362 | |
| 363 | ret = device_create_file(&pdev->dev, &dev_attr_enable); |
| 364 | if (ret < 0) |
| 365 | goto err2; |
| 366 | |
| 367 | /* setup input device */ |
| 368 | set_bit(EV_KEY, input_dev->evbit); |
| 369 | for (i = 0; keymap[i] != 0; i++) |
| 370 | set_bit(keymap[i] & KEY_MAX, input_dev->keybit); |
| 371 | input_dev->name = "omap-keypad"; |
| 372 | input_dev->phys = "omap-keypad/input0"; |
Dmitry Torokhov | 469ba4d | 2007-04-12 01:34:58 -0400 | [diff] [blame^] | 373 | input_dev->dev.parent = &pdev->dev; |
Komal Shah | ad4e09b | 2006-09-29 01:59:19 -0700 | [diff] [blame] | 374 | |
| 375 | input_dev->id.bustype = BUS_HOST; |
| 376 | input_dev->id.vendor = 0x0001; |
| 377 | input_dev->id.product = 0x0001; |
| 378 | input_dev->id.version = 0x0100; |
| 379 | |
| 380 | input_dev->keycode = keymap; |
| 381 | input_dev->keycodesize = sizeof(unsigned int); |
| 382 | input_dev->keycodemax = pdata->keymapsize; |
| 383 | |
| 384 | ret = input_register_device(omap_kp->input); |
| 385 | if (ret < 0) { |
| 386 | printk(KERN_ERR "Unable to register omap-keypad input device\n"); |
| 387 | goto err3; |
| 388 | } |
| 389 | |
| 390 | if (pdata->dbounce) |
| 391 | omap_writew(0xff, OMAP_MPUIO_BASE + OMAP_MPUIO_GPIO_DEBOUNCING); |
| 392 | |
| 393 | /* scan current status and enable interrupt */ |
| 394 | omap_kp_scan_keypad(omap_kp, keypad_state); |
| 395 | if (!cpu_is_omap24xx()) { |
| 396 | omap_kp->irq = platform_get_irq(pdev, 0); |
| 397 | if (omap_kp->irq >= 0) { |
| 398 | if (request_irq(omap_kp->irq, omap_kp_interrupt, 0, |
| 399 | "omap-keypad", omap_kp) < 0) |
| 400 | goto err4; |
| 401 | } |
| 402 | omap_writew(0, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); |
| 403 | } else { |
| 404 | for (irq_idx = 0; irq_idx < omap_kp->rows; irq_idx++) { |
| 405 | if (request_irq(OMAP_GPIO_IRQ(row_gpios[irq_idx]), |
| 406 | omap_kp_interrupt, |
| 407 | IRQF_TRIGGER_FALLING, |
| 408 | "omap-keypad", omap_kp) < 0) |
| 409 | goto err5; |
| 410 | } |
| 411 | } |
| 412 | return 0; |
| 413 | err5: |
| 414 | for (i = irq_idx-1; i >=0; i--) |
| 415 | free_irq(row_gpios[i], 0); |
| 416 | err4: |
| 417 | input_unregister_device(omap_kp->input); |
| 418 | input_dev = NULL; |
| 419 | err3: |
| 420 | device_remove_file(&pdev->dev, &dev_attr_enable); |
| 421 | err2: |
| 422 | for (i = row_idx-1; i >=0; i--) |
| 423 | omap_free_gpio(row_gpios[i]); |
| 424 | err1: |
| 425 | for (i = col_idx-1; i >=0; i--) |
| 426 | omap_free_gpio(col_gpios[i]); |
| 427 | |
| 428 | kfree(omap_kp); |
| 429 | input_free_device(input_dev); |
| 430 | |
| 431 | return -EINVAL; |
| 432 | } |
| 433 | |
| 434 | static int omap_kp_remove(struct platform_device *pdev) |
| 435 | { |
| 436 | struct omap_kp *omap_kp = platform_get_drvdata(pdev); |
| 437 | |
| 438 | /* disable keypad interrupt handling */ |
| 439 | tasklet_disable(&kp_tasklet); |
| 440 | if (cpu_is_omap24xx()) { |
| 441 | int i; |
| 442 | for (i = 0; i < omap_kp->cols; i++) |
| 443 | omap_free_gpio(col_gpios[i]); |
| 444 | for (i = 0; i < omap_kp->rows; i++) { |
| 445 | omap_free_gpio(row_gpios[i]); |
| 446 | free_irq(OMAP_GPIO_IRQ(row_gpios[i]), 0); |
| 447 | } |
| 448 | } else { |
| 449 | omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); |
| 450 | free_irq(omap_kp->irq, 0); |
| 451 | } |
| 452 | |
| 453 | del_timer_sync(&omap_kp->timer); |
| 454 | tasklet_kill(&kp_tasklet); |
| 455 | |
| 456 | /* unregister everything */ |
| 457 | input_unregister_device(omap_kp->input); |
| 458 | |
| 459 | kfree(omap_kp); |
| 460 | |
| 461 | return 0; |
| 462 | } |
| 463 | |
| 464 | static struct platform_driver omap_kp_driver = { |
| 465 | .probe = omap_kp_probe, |
| 466 | .remove = omap_kp_remove, |
| 467 | .suspend = omap_kp_suspend, |
| 468 | .resume = omap_kp_resume, |
| 469 | .driver = { |
| 470 | .name = "omap-keypad", |
| 471 | }, |
| 472 | }; |
| 473 | |
| 474 | static int __devinit omap_kp_init(void) |
| 475 | { |
| 476 | printk(KERN_INFO "OMAP Keypad Driver\n"); |
| 477 | return platform_driver_register(&omap_kp_driver); |
| 478 | } |
| 479 | |
| 480 | static void __exit omap_kp_exit(void) |
| 481 | { |
| 482 | platform_driver_unregister(&omap_kp_driver); |
| 483 | } |
| 484 | |
| 485 | module_init(omap_kp_init); |
| 486 | module_exit(omap_kp_exit); |
| 487 | |
| 488 | MODULE_AUTHOR("Timo Teräs"); |
| 489 | MODULE_DESCRIPTION("OMAP Keypad Driver"); |
| 490 | MODULE_LICENSE("GPL"); |