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 <linux/slab.h> 38 #include <asm/gpio.h> 39 #include <plat/keypad.h> 40 #include <plat/menelaus.h> 41 #include <asm/irq.h> 42 #include <mach/hardware.h> 43 #include <asm/io.h> 44 #include <plat/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 static DECLARE_TASKLET_DISABLED(kp_tasklet, omap_kp_tasklet, 0); 67 68 static unsigned int *row_gpios; 69 static unsigned int *col_gpios; 70 71 #ifdef CONFIG_ARCH_OMAP2 72 static void set_col_gpio_val(struct omap_kp *omap_kp, u8 value) 73 { 74 int col; 75 76 for (col = 0; col < omap_kp->cols; col++) 77 gpio_set_value(col_gpios[col], value & (1 << col)); 78 } 79 80 static u8 get_row_gpio_val(struct omap_kp *omap_kp) 81 { 82 int row; 83 u8 value = 0; 84 85 for (row = 0; row < omap_kp->rows; row++) { 86 if (gpio_get_value(row_gpios[row])) 87 value |= (1 << row); 88 } 89 return value; 90 } 91 #else 92 #define set_col_gpio_val(x, y) do {} while (0) 93 #define get_row_gpio_val(x) 0 94 #endif 95 96 static irqreturn_t omap_kp_interrupt(int irq, void *dev_id) 97 { 98 struct omap_kp *omap_kp = dev_id; 99 100 /* disable keyboard interrupt and schedule for handling */ 101 if (cpu_is_omap24xx()) { 102 int i; 103 104 for (i = 0; i < omap_kp->rows; i++) { 105 int gpio_irq = gpio_to_irq(row_gpios[i]); 106 /* 107 * The interrupt which we're currently handling should 108 * be disabled _nosync() to avoid deadlocks waiting 109 * for this handler to complete. All others should 110 * be disabled the regular way for SMP safety. 111 */ 112 if (gpio_irq == irq) 113 disable_irq_nosync(gpio_irq); 114 else 115 disable_irq(gpio_irq); 116 } 117 } else 118 /* disable keyboard interrupt and schedule for handling */ 119 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); 120 121 tasklet_schedule(&kp_tasklet); 122 123 return IRQ_HANDLED; 124 } 125 126 static void omap_kp_timer(unsigned long data) 127 { 128 tasklet_schedule(&kp_tasklet); 129 } 130 131 static void omap_kp_scan_keypad(struct omap_kp *omap_kp, unsigned char *state) 132 { 133 int col = 0; 134 135 /* read the keypad status */ 136 if (cpu_is_omap24xx()) { 137 /* read the keypad status */ 138 for (col = 0; col < omap_kp->cols; col++) { 139 set_col_gpio_val(omap_kp, ~(1 << col)); 140 state[col] = ~(get_row_gpio_val(omap_kp)) & 0xff; 141 } 142 set_col_gpio_val(omap_kp, 0); 143 144 } else { 145 /* disable keyboard interrupt and schedule for handling */ 146 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); 147 148 /* read the keypad status */ 149 omap_writew(0xff, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC); 150 for (col = 0; col < omap_kp->cols; col++) { 151 omap_writew(~(1 << col) & 0xff, 152 OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC); 153 154 udelay(omap_kp->delay); 155 156 state[col] = ~omap_readw(OMAP1_MPUIO_BASE + 157 OMAP_MPUIO_KBR_LATCH) & 0xff; 158 } 159 omap_writew(0x00, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC); 160 udelay(2); 161 } 162 } 163 164 static void omap_kp_tasklet(unsigned long data) 165 { 166 struct omap_kp *omap_kp_data = (struct omap_kp *) data; 167 unsigned short *keycodes = omap_kp_data->input->keycode; 168 unsigned int row_shift = get_count_order(omap_kp_data->cols); 169 unsigned char new_state[8], changed, key_down = 0; 170 int col, row; 171 int spurious = 0; 172 173 /* check for any changes */ 174 omap_kp_scan_keypad(omap_kp_data, new_state); 175 176 /* check for changes and print those */ 177 for (col = 0; col < omap_kp_data->cols; col++) { 178 changed = new_state[col] ^ keypad_state[col]; 179 key_down |= new_state[col]; 180 if (changed == 0) 181 continue; 182 183 for (row = 0; row < omap_kp_data->rows; row++) { 184 int key; 185 if (!(changed & (1 << row))) 186 continue; 187 #ifdef NEW_BOARD_LEARNING_MODE 188 printk(KERN_INFO "omap-keypad: key %d-%d %s\n", col, 189 row, (new_state[col] & (1 << row)) ? 190 "pressed" : "released"); 191 #else 192 key = keycodes[MATRIX_SCAN_CODE(row, col, row_shift)]; 193 if (key < 0) { 194 printk(KERN_WARNING 195 "omap-keypad: Spurious key event %d-%d\n", 196 col, row); 197 /* We scan again after a couple of seconds */ 198 spurious = 1; 199 continue; 200 } 201 202 if (!(kp_cur_group == (key & GROUP_MASK) || 203 kp_cur_group == -1)) 204 continue; 205 206 kp_cur_group = key & GROUP_MASK; 207 input_report_key(omap_kp_data->input, key & ~GROUP_MASK, 208 new_state[col] & (1 << row)); 209 #endif 210 } 211 } 212 input_sync(omap_kp_data->input); 213 memcpy(keypad_state, new_state, sizeof(keypad_state)); 214 215 if (key_down) { 216 int delay = HZ / 20; 217 /* some key is pressed - keep irq disabled and use timer 218 * to poll the keypad */ 219 if (spurious) 220 delay = 2 * HZ; 221 mod_timer(&omap_kp_data->timer, jiffies + delay); 222 } else { 223 /* enable interrupts */ 224 if (cpu_is_omap24xx()) { 225 int i; 226 for (i = 0; i < omap_kp_data->rows; i++) 227 enable_irq(gpio_to_irq(row_gpios[i])); 228 } else { 229 omap_writew(0, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); 230 kp_cur_group = -1; 231 } 232 } 233 } 234 235 static ssize_t omap_kp_enable_show(struct device *dev, 236 struct device_attribute *attr, char *buf) 237 { 238 return sprintf(buf, "%u\n", kp_enable); 239 } 240 241 static ssize_t omap_kp_enable_store(struct device *dev, struct device_attribute *attr, 242 const char *buf, size_t count) 243 { 244 int state; 245 246 if (sscanf(buf, "%u", &state) != 1) 247 return -EINVAL; 248 249 if ((state != 1) && (state != 0)) 250 return -EINVAL; 251 252 mutex_lock(&kp_enable_mutex); 253 if (state != kp_enable) { 254 if (state) 255 enable_irq(INT_KEYBOARD); 256 else 257 disable_irq(INT_KEYBOARD); 258 kp_enable = state; 259 } 260 mutex_unlock(&kp_enable_mutex); 261 262 return strnlen(buf, count); 263 } 264 265 static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, omap_kp_enable_show, omap_kp_enable_store); 266 267 #ifdef CONFIG_PM 268 static int omap_kp_suspend(struct platform_device *dev, pm_message_t state) 269 { 270 /* Nothing yet */ 271 272 return 0; 273 } 274 275 static int omap_kp_resume(struct platform_device *dev) 276 { 277 /* Nothing yet */ 278 279 return 0; 280 } 281 #else 282 #define omap_kp_suspend NULL 283 #define omap_kp_resume NULL 284 #endif 285 286 static int __devinit omap_kp_probe(struct platform_device *pdev) 287 { 288 struct omap_kp *omap_kp; 289 struct input_dev *input_dev; 290 struct omap_kp_platform_data *pdata = pdev->dev.platform_data; 291 int i, col_idx, row_idx, irq_idx, ret; 292 unsigned int row_shift, keycodemax; 293 294 if (!pdata->rows || !pdata->cols || !pdata->keymap_data) { 295 printk(KERN_ERR "No rows, cols or keymap_data from pdata\n"); 296 return -EINVAL; 297 } 298 299 row_shift = get_count_order(pdata->cols); 300 keycodemax = pdata->rows << row_shift; 301 302 omap_kp = kzalloc(sizeof(struct omap_kp) + 303 keycodemax * sizeof(unsigned short), GFP_KERNEL); 304 input_dev = input_allocate_device(); 305 if (!omap_kp || !input_dev) { 306 kfree(omap_kp); 307 input_free_device(input_dev); 308 return -ENOMEM; 309 } 310 311 platform_set_drvdata(pdev, omap_kp); 312 313 omap_kp->input = input_dev; 314 315 /* Disable the interrupt for the MPUIO keyboard */ 316 if (!cpu_is_omap24xx()) 317 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); 318 319 input_dev->keycode = &omap_kp[1]; 320 input_dev->keycodesize = sizeof(unsigned short); 321 input_dev->keycodemax = keycodemax; 322 323 if (pdata->rep) 324 __set_bit(EV_REP, input_dev->evbit); 325 326 if (pdata->delay) 327 omap_kp->delay = pdata->delay; 328 329 if (pdata->row_gpios && pdata->col_gpios) { 330 row_gpios = pdata->row_gpios; 331 col_gpios = pdata->col_gpios; 332 } 333 334 omap_kp->rows = pdata->rows; 335 omap_kp->cols = pdata->cols; 336 337 if (cpu_is_omap24xx()) { 338 /* Cols: outputs */ 339 for (col_idx = 0; col_idx < omap_kp->cols; col_idx++) { 340 if (gpio_request(col_gpios[col_idx], "omap_kp_col") < 0) { 341 printk(KERN_ERR "Failed to request" 342 "GPIO%d for keypad\n", 343 col_gpios[col_idx]); 344 goto err1; 345 } 346 gpio_direction_output(col_gpios[col_idx], 0); 347 } 348 /* Rows: inputs */ 349 for (row_idx = 0; row_idx < omap_kp->rows; row_idx++) { 350 if (gpio_request(row_gpios[row_idx], "omap_kp_row") < 0) { 351 printk(KERN_ERR "Failed to request" 352 "GPIO%d for keypad\n", 353 row_gpios[row_idx]); 354 goto err2; 355 } 356 gpio_direction_input(row_gpios[row_idx]); 357 } 358 } else { 359 col_idx = 0; 360 row_idx = 0; 361 } 362 363 setup_timer(&omap_kp->timer, omap_kp_timer, (unsigned long)omap_kp); 364 365 /* get the irq and init timer*/ 366 tasklet_enable(&kp_tasklet); 367 kp_tasklet.data = (unsigned long) omap_kp; 368 369 ret = device_create_file(&pdev->dev, &dev_attr_enable); 370 if (ret < 0) 371 goto err2; 372 373 /* setup input device */ 374 __set_bit(EV_KEY, input_dev->evbit); 375 matrix_keypad_build_keymap(pdata->keymap_data, row_shift, 376 input_dev->keycode, input_dev->keybit); 377 input_dev->name = "omap-keypad"; 378 input_dev->phys = "omap-keypad/input0"; 379 input_dev->dev.parent = &pdev->dev; 380 381 input_dev->id.bustype = BUS_HOST; 382 input_dev->id.vendor = 0x0001; 383 input_dev->id.product = 0x0001; 384 input_dev->id.version = 0x0100; 385 386 ret = input_register_device(omap_kp->input); 387 if (ret < 0) { 388 printk(KERN_ERR "Unable to register omap-keypad input device\n"); 389 goto err3; 390 } 391 392 if (pdata->dbounce) 393 omap_writew(0xff, OMAP1_MPUIO_BASE + OMAP_MPUIO_GPIO_DEBOUNCING); 394 395 /* scan current status and enable interrupt */ 396 omap_kp_scan_keypad(omap_kp, keypad_state); 397 if (!cpu_is_omap24xx()) { 398 omap_kp->irq = platform_get_irq(pdev, 0); 399 if (omap_kp->irq >= 0) { 400 if (request_irq(omap_kp->irq, omap_kp_interrupt, 0, 401 "omap-keypad", omap_kp) < 0) 402 goto err4; 403 } 404 omap_writew(0, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); 405 } else { 406 for (irq_idx = 0; irq_idx < omap_kp->rows; irq_idx++) { 407 if (request_irq(gpio_to_irq(row_gpios[irq_idx]), 408 omap_kp_interrupt, 409 IRQF_TRIGGER_FALLING, 410 "omap-keypad", omap_kp) < 0) 411 goto err5; 412 } 413 } 414 return 0; 415 err5: 416 for (i = irq_idx - 1; i >=0; i--) 417 free_irq(row_gpios[i], omap_kp); 418 err4: 419 input_unregister_device(omap_kp->input); 420 input_dev = NULL; 421 err3: 422 device_remove_file(&pdev->dev, &dev_attr_enable); 423 err2: 424 for (i = row_idx - 1; i >=0; i--) 425 gpio_free(row_gpios[i]); 426 err1: 427 for (i = col_idx - 1; i >=0; i--) 428 gpio_free(col_gpios[i]); 429 430 kfree(omap_kp); 431 input_free_device(input_dev); 432 433 return -EINVAL; 434 } 435 436 static int __devexit omap_kp_remove(struct platform_device *pdev) 437 { 438 struct omap_kp *omap_kp = platform_get_drvdata(pdev); 439 440 /* disable keypad interrupt handling */ 441 tasklet_disable(&kp_tasklet); 442 if (cpu_is_omap24xx()) { 443 int i; 444 for (i = 0; i < omap_kp->cols; i++) 445 gpio_free(col_gpios[i]); 446 for (i = 0; i < omap_kp->rows; i++) { 447 gpio_free(row_gpios[i]); 448 free_irq(gpio_to_irq(row_gpios[i]), omap_kp); 449 } 450 } else { 451 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); 452 free_irq(omap_kp->irq, omap_kp); 453 } 454 455 del_timer_sync(&omap_kp->timer); 456 tasklet_kill(&kp_tasklet); 457 458 /* unregister everything */ 459 input_unregister_device(omap_kp->input); 460 461 kfree(omap_kp); 462 463 return 0; 464 } 465 466 static struct platform_driver omap_kp_driver = { 467 .probe = omap_kp_probe, 468 .remove = __devexit_p(omap_kp_remove), 469 .suspend = omap_kp_suspend, 470 .resume = omap_kp_resume, 471 .driver = { 472 .name = "omap-keypad", 473 .owner = THIS_MODULE, 474 }, 475 }; 476 module_platform_driver(omap_kp_driver); 477 478 MODULE_AUTHOR("Timo Teräs"); 479 MODULE_DESCRIPTION("OMAP Keypad Driver"); 480 MODULE_LICENSE("GPL"); 481 MODULE_ALIAS("platform:omap-keypad"); 482