1 /* 2 * Copyright (c) 2005 John Lenz 3 * 4 * Based on from xtkbd.c 5 */ 6 7 /* 8 * LoCoMo keyboard driver for Linux/ARM 9 */ 10 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 28 #include <linux/config.h> 29 #include <linux/slab.h> 30 #include <linux/module.h> 31 #include <linux/init.h> 32 #include <linux/input.h> 33 #include <linux/delay.h> 34 #include <linux/device.h> 35 #include <linux/interrupt.h> 36 #include <linux/ioport.h> 37 38 #include <asm/hardware/locomo.h> 39 #include <asm/irq.h> 40 41 MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>"); 42 MODULE_DESCRIPTION("LoCoMo keyboard driver"); 43 MODULE_LICENSE("GPL"); 44 45 #define LOCOMOKBD_NUMKEYS 128 46 47 #define KEY_ACTIVITY KEY_F16 48 #define KEY_CONTACT KEY_F18 49 #define KEY_CENTER KEY_F15 50 51 static unsigned char locomokbd_keycode[LOCOMOKBD_NUMKEYS] = { 52 0, KEY_ESC, KEY_ACTIVITY, 0, 0, 0, 0, 0, 0, 0, /* 0 - 9 */ 53 0, 0, 0, 0, 0, 0, 0, KEY_MENU, KEY_HOME, KEY_CONTACT, /* 10 - 19 */ 54 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 20 - 29 */ 55 0, 0, 0, KEY_CENTER, 0, KEY_MAIL, 0, 0, 0, 0, /* 30 - 39 */ 56 0, 0, 0, 0, 0, 0, 0, 0, 0, KEY_RIGHT, /* 40 - 49 */ 57 KEY_UP, KEY_LEFT, 0, 0, KEY_P, 0, KEY_O, KEY_I, KEY_Y, KEY_T, /* 50 - 59 */ 58 KEY_E, KEY_W, 0, 0, 0, 0, KEY_DOWN, KEY_ENTER, 0, 0, /* 60 - 69 */ 59 KEY_BACKSPACE, 0, KEY_L, KEY_U, KEY_H, KEY_R, KEY_D, KEY_Q, 0, 0, /* 70 - 79 */ 60 0, 0, 0, 0, 0, 0, KEY_ENTER, KEY_RIGHTSHIFT, KEY_K, KEY_J, /* 80 - 89 */ 61 KEY_G, KEY_F, KEY_X, KEY_S, 0, 0, 0, 0, 0, 0, /* 90 - 99 */ 62 0, 0, KEY_DOT, 0, KEY_COMMA, KEY_N, KEY_B, KEY_C, KEY_Z, KEY_A, /* 100 - 109 */ 63 KEY_LEFTSHIFT, KEY_TAB, KEY_LEFTCTRL, 0, 0, 0, 0, 0, 0, 0, /* 110 - 119 */ 64 KEY_M, KEY_SPACE, KEY_V, KEY_APOSTROPHE, KEY_SLASH, 0, 0, 0 /* 120 - 128 */ 65 }; 66 67 #define KB_ROWS 16 68 #define KB_COLS 8 69 #define KB_ROWMASK(r) (1 << (r)) 70 #define SCANCODE(c,r) ( ((c)<<4) + (r) + 1 ) 71 #define NR_SCANCODES 128 72 73 #define KB_DELAY 8 74 #define SCAN_INTERVAL (HZ/10) 75 #define LOCOMOKBD_PRESSED 1 76 77 struct locomokbd { 78 unsigned char keycode[LOCOMOKBD_NUMKEYS]; 79 struct input_dev *input; 80 char phys[32]; 81 82 struct locomo_dev *ldev; 83 unsigned long base; 84 spinlock_t lock; 85 86 struct timer_list timer; 87 }; 88 89 /* helper functions for reading the keyboard matrix */ 90 static inline void locomokbd_charge_all(unsigned long membase) 91 { 92 locomo_writel(0x00FF, membase + LOCOMO_KSC); 93 } 94 95 static inline void locomokbd_activate_all(unsigned long membase) 96 { 97 unsigned long r; 98 99 locomo_writel(0, membase + LOCOMO_KSC); 100 r = locomo_readl(membase + LOCOMO_KIC); 101 r &= 0xFEFF; 102 locomo_writel(r, membase + LOCOMO_KIC); 103 } 104 105 static inline void locomokbd_activate_col(unsigned long membase, int col) 106 { 107 unsigned short nset; 108 unsigned short nbset; 109 110 nset = 0xFF & ~(1 << col); 111 nbset = (nset << 8) + nset; 112 locomo_writel(nbset, membase + LOCOMO_KSC); 113 } 114 115 static inline void locomokbd_reset_col(unsigned long membase, int col) 116 { 117 unsigned short nbset; 118 119 nbset = ((0xFF & ~(1 << col)) << 8) + 0xFF; 120 locomo_writel(nbset, membase + LOCOMO_KSC); 121 } 122 123 /* 124 * The LoCoMo keyboard only generates interrupts when a key is pressed. 125 * So when a key is pressed, we enable a timer. This timer scans the 126 * keyboard, and this is how we detect when the key is released. 127 */ 128 129 /* Scan the hardware keyboard and push any changes up through the input layer */ 130 static void locomokbd_scankeyboard(struct locomokbd *locomokbd, struct pt_regs *regs) 131 { 132 unsigned int row, col, rowd, scancode; 133 unsigned long flags; 134 unsigned int num_pressed; 135 unsigned long membase = locomokbd->base; 136 137 spin_lock_irqsave(&locomokbd->lock, flags); 138 139 input_regs(locomokbd->input, regs); 140 141 locomokbd_charge_all(membase); 142 143 num_pressed = 0; 144 for (col = 0; col < KB_COLS; col++) { 145 146 locomokbd_activate_col(membase, col); 147 udelay(KB_DELAY); 148 149 rowd = ~locomo_readl(membase + LOCOMO_KIB); 150 for (row = 0; row < KB_ROWS; row++) { 151 scancode = SCANCODE(col, row); 152 if (rowd & KB_ROWMASK(row)) { 153 num_pressed += 1; 154 input_report_key(locomokbd->input, locomokbd->keycode[scancode], 1); 155 } else { 156 input_report_key(locomokbd->input, locomokbd->keycode[scancode], 0); 157 } 158 } 159 locomokbd_reset_col(membase, col); 160 } 161 locomokbd_activate_all(membase); 162 163 input_sync(locomokbd->input); 164 165 /* if any keys are pressed, enable the timer */ 166 if (num_pressed) 167 mod_timer(&locomokbd->timer, jiffies + SCAN_INTERVAL); 168 169 spin_unlock_irqrestore(&locomokbd->lock, flags); 170 } 171 172 /* 173 * LoCoMo keyboard interrupt handler. 174 */ 175 static irqreturn_t locomokbd_interrupt(int irq, void *dev_id, struct pt_regs *regs) 176 { 177 struct locomokbd *locomokbd = dev_id; 178 /** wait chattering delay **/ 179 udelay(100); 180 181 locomokbd_scankeyboard(locomokbd, regs); 182 183 return IRQ_HANDLED; 184 } 185 186 /* 187 * LoCoMo timer checking for released keys 188 */ 189 static void locomokbd_timer_callback(unsigned long data) 190 { 191 struct locomokbd *locomokbd = (struct locomokbd *) data; 192 locomokbd_scankeyboard(locomokbd, NULL); 193 } 194 195 static int locomokbd_probe(struct locomo_dev *dev) 196 { 197 struct locomokbd *locomokbd; 198 struct input_dev *input_dev; 199 int i, ret; 200 201 locomokbd = kzalloc(sizeof(struct locomokbd), GFP_KERNEL); 202 input_dev = input_allocate_device(); 203 if (!locomokbd || !input_dev) { 204 ret = -ENOMEM; 205 goto free; 206 } 207 208 /* try and claim memory region */ 209 if (!request_mem_region((unsigned long) dev->mapbase, 210 dev->length, 211 LOCOMO_DRIVER_NAME(dev))) { 212 ret = -EBUSY; 213 printk(KERN_ERR "locomokbd: Can't acquire access to io memory for keyboard\n"); 214 goto free; 215 } 216 217 locomokbd->ldev = dev; 218 locomo_set_drvdata(dev, locomokbd); 219 220 locomokbd->base = (unsigned long) dev->mapbase; 221 222 spin_lock_init(&locomokbd->lock); 223 224 init_timer(&locomokbd->timer); 225 locomokbd->timer.function = locomokbd_timer_callback; 226 locomokbd->timer.data = (unsigned long) locomokbd; 227 228 locomokbd->input = input_dev; 229 strcpy(locomokbd->phys, "locomokbd/input0"); 230 231 input_dev->name = "LoCoMo keyboard"; 232 input_dev->phys = locomokbd->phys; 233 input_dev->id.bustype = BUS_HOST; 234 input_dev->id.vendor = 0x0001; 235 input_dev->id.product = 0x0001; 236 input_dev->id.version = 0x0100; 237 input_dev->private = locomokbd; 238 239 input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REP); 240 input_dev->keycode = locomokbd->keycode; 241 input_dev->keycodesize = sizeof(unsigned char); 242 input_dev->keycodemax = ARRAY_SIZE(locomokbd_keycode); 243 244 memcpy(locomokbd->keycode, locomokbd_keycode, sizeof(locomokbd->keycode)); 245 for (i = 0; i < LOCOMOKBD_NUMKEYS; i++) 246 set_bit(locomokbd->keycode[i], input_dev->keybit); 247 clear_bit(0, input_dev->keybit); 248 249 /* attempt to get the interrupt */ 250 ret = request_irq(dev->irq[0], locomokbd_interrupt, 0, "locomokbd", locomokbd); 251 if (ret) { 252 printk(KERN_ERR "locomokbd: Can't get irq for keyboard\n"); 253 goto out; 254 } 255 256 input_register_device(locomokbd->input); 257 258 return 0; 259 260 out: 261 release_mem_region((unsigned long) dev->mapbase, dev->length); 262 locomo_set_drvdata(dev, NULL); 263 free: 264 input_free_device(input_dev); 265 kfree(locomokbd); 266 267 return ret; 268 } 269 270 static int locomokbd_remove(struct locomo_dev *dev) 271 { 272 struct locomokbd *locomokbd = locomo_get_drvdata(dev); 273 274 free_irq(dev->irq[0], locomokbd); 275 276 del_timer_sync(&locomokbd->timer); 277 278 input_unregister_device(locomokbd->input); 279 locomo_set_drvdata(dev, NULL); 280 281 release_mem_region((unsigned long) dev->mapbase, dev->length); 282 283 kfree(locomokbd); 284 285 return 0; 286 } 287 288 static struct locomo_driver keyboard_driver = { 289 .drv = { 290 .name = "locomokbd" 291 }, 292 .devid = LOCOMO_DEVID_KEYBOARD, 293 .probe = locomokbd_probe, 294 .remove = locomokbd_remove, 295 }; 296 297 static int __init locomokbd_init(void) 298 { 299 return locomo_driver_register(&keyboard_driver); 300 } 301 302 static void __exit locomokbd_exit(void) 303 { 304 locomo_driver_unregister(&keyboard_driver); 305 } 306 307 module_init(locomokbd_init); 308 module_exit(locomokbd_exit); 309