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/interrupt.h> 29 #include <linux/types.h> 30 #include <linux/input.h> 31 #include <linux/kernel.h> 32 #include <linux/delay.h> 33 #include <linux/platform_device.h> 34 #include <linux/mutex.h> 35 #include <linux/errno.h> 36 #include <linux/slab.h> 37 #include <linux/gpio.h> 38 #include <linux/platform_data/gpio-omap.h> 39 #include <linux/platform_data/keypad-omap.h> 40 41 #undef NEW_BOARD_LEARNING_MODE 42 43 static void omap_kp_tasklet(unsigned long); 44 static void omap_kp_timer(unsigned long); 45 46 static unsigned char keypad_state[8]; 47 static DEFINE_MUTEX(kp_enable_mutex); 48 static int kp_enable = 1; 49 static int kp_cur_group = -1; 50 51 struct omap_kp { 52 struct input_dev *input; 53 struct timer_list timer; 54 int irq; 55 unsigned int rows; 56 unsigned int cols; 57 unsigned long delay; 58 unsigned int debounce; 59 unsigned short keymap[]; 60 }; 61 62 static DECLARE_TASKLET_DISABLED(kp_tasklet, omap_kp_tasklet, 0); 63 64 static unsigned int *row_gpios; 65 static unsigned int *col_gpios; 66 67 static irqreturn_t omap_kp_interrupt(int irq, void *dev_id) 68 { 69 /* disable keyboard interrupt and schedule for handling */ 70 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); 71 72 tasklet_schedule(&kp_tasklet); 73 74 return IRQ_HANDLED; 75 } 76 77 static void omap_kp_timer(unsigned long data) 78 { 79 tasklet_schedule(&kp_tasklet); 80 } 81 82 static void omap_kp_scan_keypad(struct omap_kp *omap_kp, unsigned char *state) 83 { 84 int col = 0; 85 86 /* disable keyboard interrupt and schedule for handling */ 87 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); 88 89 /* read the keypad status */ 90 omap_writew(0xff, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC); 91 for (col = 0; col < omap_kp->cols; col++) { 92 omap_writew(~(1 << col) & 0xff, 93 OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC); 94 95 udelay(omap_kp->delay); 96 97 state[col] = ~omap_readw(OMAP1_MPUIO_BASE + 98 OMAP_MPUIO_KBR_LATCH) & 0xff; 99 } 100 omap_writew(0x00, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC); 101 udelay(2); 102 } 103 104 static void omap_kp_tasklet(unsigned long data) 105 { 106 struct omap_kp *omap_kp_data = (struct omap_kp *) data; 107 unsigned short *keycodes = omap_kp_data->input->keycode; 108 unsigned int row_shift = get_count_order(omap_kp_data->cols); 109 unsigned char new_state[8], changed, key_down = 0; 110 int col, row; 111 112 /* check for any changes */ 113 omap_kp_scan_keypad(omap_kp_data, new_state); 114 115 /* check for changes and print those */ 116 for (col = 0; col < omap_kp_data->cols; col++) { 117 changed = new_state[col] ^ keypad_state[col]; 118 key_down |= new_state[col]; 119 if (changed == 0) 120 continue; 121 122 for (row = 0; row < omap_kp_data->rows; row++) { 123 int key; 124 if (!(changed & (1 << row))) 125 continue; 126 #ifdef NEW_BOARD_LEARNING_MODE 127 printk(KERN_INFO "omap-keypad: key %d-%d %s\n", col, 128 row, (new_state[col] & (1 << row)) ? 129 "pressed" : "released"); 130 #else 131 key = keycodes[MATRIX_SCAN_CODE(row, col, row_shift)]; 132 133 if (!(kp_cur_group == (key & GROUP_MASK) || 134 kp_cur_group == -1)) 135 continue; 136 137 kp_cur_group = key & GROUP_MASK; 138 input_report_key(omap_kp_data->input, key & ~GROUP_MASK, 139 new_state[col] & (1 << row)); 140 #endif 141 } 142 } 143 input_sync(omap_kp_data->input); 144 memcpy(keypad_state, new_state, sizeof(keypad_state)); 145 146 if (key_down) { 147 /* some key is pressed - keep irq disabled and use timer 148 * to poll the keypad */ 149 mod_timer(&omap_kp_data->timer, jiffies + HZ / 20); 150 } else { 151 /* enable interrupts */ 152 omap_writew(0, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); 153 kp_cur_group = -1; 154 } 155 } 156 157 static ssize_t omap_kp_enable_show(struct device *dev, 158 struct device_attribute *attr, char *buf) 159 { 160 return sprintf(buf, "%u\n", kp_enable); 161 } 162 163 static ssize_t omap_kp_enable_store(struct device *dev, struct device_attribute *attr, 164 const char *buf, size_t count) 165 { 166 struct omap_kp *omap_kp = dev_get_drvdata(dev); 167 int state; 168 169 if (sscanf(buf, "%u", &state) != 1) 170 return -EINVAL; 171 172 if ((state != 1) && (state != 0)) 173 return -EINVAL; 174 175 mutex_lock(&kp_enable_mutex); 176 if (state != kp_enable) { 177 if (state) 178 enable_irq(omap_kp->irq); 179 else 180 disable_irq(omap_kp->irq); 181 kp_enable = state; 182 } 183 mutex_unlock(&kp_enable_mutex); 184 185 return strnlen(buf, count); 186 } 187 188 static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, omap_kp_enable_show, omap_kp_enable_store); 189 190 static int omap_kp_probe(struct platform_device *pdev) 191 { 192 struct omap_kp *omap_kp; 193 struct input_dev *input_dev; 194 struct omap_kp_platform_data *pdata = dev_get_platdata(&pdev->dev); 195 int i, col_idx, row_idx, ret; 196 unsigned int row_shift, keycodemax; 197 198 if (!pdata->rows || !pdata->cols || !pdata->keymap_data) { 199 printk(KERN_ERR "No rows, cols or keymap_data from pdata\n"); 200 return -EINVAL; 201 } 202 203 row_shift = get_count_order(pdata->cols); 204 keycodemax = pdata->rows << row_shift; 205 206 omap_kp = kzalloc(sizeof(struct omap_kp) + 207 keycodemax * sizeof(unsigned short), GFP_KERNEL); 208 input_dev = input_allocate_device(); 209 if (!omap_kp || !input_dev) { 210 kfree(omap_kp); 211 input_free_device(input_dev); 212 return -ENOMEM; 213 } 214 215 platform_set_drvdata(pdev, omap_kp); 216 217 omap_kp->input = input_dev; 218 219 /* Disable the interrupt for the MPUIO keyboard */ 220 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); 221 222 if (pdata->delay) 223 omap_kp->delay = pdata->delay; 224 225 if (pdata->row_gpios && pdata->col_gpios) { 226 row_gpios = pdata->row_gpios; 227 col_gpios = pdata->col_gpios; 228 } 229 230 omap_kp->rows = pdata->rows; 231 omap_kp->cols = pdata->cols; 232 233 col_idx = 0; 234 row_idx = 0; 235 236 setup_timer(&omap_kp->timer, omap_kp_timer, (unsigned long)omap_kp); 237 238 /* get the irq and init timer*/ 239 kp_tasklet.data = (unsigned long) omap_kp; 240 tasklet_enable(&kp_tasklet); 241 242 ret = device_create_file(&pdev->dev, &dev_attr_enable); 243 if (ret < 0) 244 goto err2; 245 246 /* setup input device */ 247 input_dev->name = "omap-keypad"; 248 input_dev->phys = "omap-keypad/input0"; 249 input_dev->dev.parent = &pdev->dev; 250 251 input_dev->id.bustype = BUS_HOST; 252 input_dev->id.vendor = 0x0001; 253 input_dev->id.product = 0x0001; 254 input_dev->id.version = 0x0100; 255 256 if (pdata->rep) 257 __set_bit(EV_REP, input_dev->evbit); 258 259 ret = matrix_keypad_build_keymap(pdata->keymap_data, NULL, 260 pdata->rows, pdata->cols, 261 omap_kp->keymap, input_dev); 262 if (ret < 0) 263 goto err3; 264 265 ret = input_register_device(omap_kp->input); 266 if (ret < 0) { 267 printk(KERN_ERR "Unable to register omap-keypad input device\n"); 268 goto err3; 269 } 270 271 if (pdata->dbounce) 272 omap_writew(0xff, OMAP1_MPUIO_BASE + OMAP_MPUIO_GPIO_DEBOUNCING); 273 274 /* scan current status and enable interrupt */ 275 omap_kp_scan_keypad(omap_kp, keypad_state); 276 omap_kp->irq = platform_get_irq(pdev, 0); 277 if (omap_kp->irq >= 0) { 278 if (request_irq(omap_kp->irq, omap_kp_interrupt, 0, 279 "omap-keypad", omap_kp) < 0) 280 goto err4; 281 } 282 omap_writew(0, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); 283 284 return 0; 285 286 err4: 287 input_unregister_device(omap_kp->input); 288 input_dev = NULL; 289 err3: 290 device_remove_file(&pdev->dev, &dev_attr_enable); 291 err2: 292 for (i = row_idx - 1; i >= 0; i--) 293 gpio_free(row_gpios[i]); 294 for (i = col_idx - 1; i >= 0; i--) 295 gpio_free(col_gpios[i]); 296 297 kfree(omap_kp); 298 input_free_device(input_dev); 299 300 return -EINVAL; 301 } 302 303 static int omap_kp_remove(struct platform_device *pdev) 304 { 305 struct omap_kp *omap_kp = platform_get_drvdata(pdev); 306 307 /* disable keypad interrupt handling */ 308 tasklet_disable(&kp_tasklet); 309 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT); 310 free_irq(omap_kp->irq, omap_kp); 311 312 del_timer_sync(&omap_kp->timer); 313 tasklet_kill(&kp_tasklet); 314 315 /* unregister everything */ 316 input_unregister_device(omap_kp->input); 317 318 kfree(omap_kp); 319 320 return 0; 321 } 322 323 static struct platform_driver omap_kp_driver = { 324 .probe = omap_kp_probe, 325 .remove = omap_kp_remove, 326 .driver = { 327 .name = "omap-keypad", 328 }, 329 }; 330 module_platform_driver(omap_kp_driver); 331 332 MODULE_AUTHOR("Timo Teräs"); 333 MODULE_DESCRIPTION("OMAP Keypad Driver"); 334 MODULE_LICENSE("GPL"); 335 MODULE_ALIAS("platform:omap-keypad"); 336