fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / drivers / input / keyboard / locomokbd.c
blob7a41b271f222cfb5bdf5b68cd6946e27d6c88bf8
1 /*
2 * Copyright (c) 2005 John Lenz
4 * Based on from xtkbd.c
5 */
7 /*
8 * LoCoMo keyboard driver for Linux/ARM
9 */
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.
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.
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
28 #include <linux/slab.h>
29 #include <linux/module.h>
30 #include <linux/init.h>
31 #include <linux/input.h>
32 #include <linux/delay.h>
33 #include <linux/device.h>
34 #include <linux/interrupt.h>
35 #include <linux/ioport.h>
37 #include <asm/hardware/locomo.h>
38 #include <asm/irq.h>
40 MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>");
41 MODULE_DESCRIPTION("LoCoMo keyboard driver");
42 MODULE_LICENSE("GPL");
44 #define LOCOMOKBD_NUMKEYS 128
46 #define KEY_ACTIVITY KEY_F16
47 #define KEY_CONTACT KEY_F18
48 #define KEY_CENTER KEY_F15
50 static unsigned char locomokbd_keycode[LOCOMOKBD_NUMKEYS] = {
51 0, KEY_ESC, KEY_ACTIVITY, 0, 0, 0, 0, 0, 0, 0, /* 0 - 9 */
52 0, 0, 0, 0, 0, 0, 0, KEY_MENU, KEY_HOME, KEY_CONTACT, /* 10 - 19 */
53 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 20 - 29 */
54 0, 0, 0, KEY_CENTER, 0, KEY_MAIL, 0, 0, 0, 0, /* 30 - 39 */
55 0, 0, 0, 0, 0, 0, 0, 0, 0, KEY_RIGHT, /* 40 - 49 */
56 KEY_UP, KEY_LEFT, 0, 0, KEY_P, 0, KEY_O, KEY_I, KEY_Y, KEY_T, /* 50 - 59 */
57 KEY_E, KEY_W, 0, 0, 0, 0, KEY_DOWN, KEY_ENTER, 0, 0, /* 60 - 69 */
58 KEY_BACKSPACE, 0, KEY_L, KEY_U, KEY_H, KEY_R, KEY_D, KEY_Q, 0, 0, /* 70 - 79 */
59 0, 0, 0, 0, 0, 0, KEY_ENTER, KEY_RIGHTSHIFT, KEY_K, KEY_J, /* 80 - 89 */
60 KEY_G, KEY_F, KEY_X, KEY_S, 0, 0, 0, 0, 0, 0, /* 90 - 99 */
61 0, 0, KEY_DOT, 0, KEY_COMMA, KEY_N, KEY_B, KEY_C, KEY_Z, KEY_A, /* 100 - 109 */
62 KEY_LEFTSHIFT, KEY_TAB, KEY_LEFTCTRL, 0, 0, 0, 0, 0, 0, 0, /* 110 - 119 */
63 KEY_M, KEY_SPACE, KEY_V, KEY_APOSTROPHE, KEY_SLASH, 0, 0, 0 /* 120 - 128 */
66 #define KB_ROWS 16
67 #define KB_COLS 8
68 #define KB_ROWMASK(r) (1 << (r))
69 #define SCANCODE(c,r) ( ((c)<<4) + (r) + 1 )
70 #define NR_SCANCODES 128
72 #define KB_DELAY 8
73 #define SCAN_INTERVAL (HZ/10)
74 #define LOCOMOKBD_PRESSED 1
76 struct locomokbd {
77 unsigned char keycode[LOCOMOKBD_NUMKEYS];
78 struct input_dev *input;
79 char phys[32];
81 struct locomo_dev *ldev;
82 unsigned long base;
83 spinlock_t lock;
85 struct timer_list timer;
88 /* helper functions for reading the keyboard matrix */
89 static inline void locomokbd_charge_all(unsigned long membase)
91 locomo_writel(0x00FF, membase + LOCOMO_KSC);
94 static inline void locomokbd_activate_all(unsigned long membase)
96 unsigned long r;
98 locomo_writel(0, membase + LOCOMO_KSC);
99 r = locomo_readl(membase + LOCOMO_KIC);
100 r &= 0xFEFF;
101 locomo_writel(r, membase + LOCOMO_KIC);
104 static inline void locomokbd_activate_col(unsigned long membase, int col)
106 unsigned short nset;
107 unsigned short nbset;
109 nset = 0xFF & ~(1 << col);
110 nbset = (nset << 8) + nset;
111 locomo_writel(nbset, membase + LOCOMO_KSC);
114 static inline void locomokbd_reset_col(unsigned long membase, int col)
116 unsigned short nbset;
118 nbset = ((0xFF & ~(1 << col)) << 8) + 0xFF;
119 locomo_writel(nbset, membase + LOCOMO_KSC);
123 * The LoCoMo keyboard only generates interrupts when a key is pressed.
124 * So when a key is pressed, we enable a timer. This timer scans the
125 * keyboard, and this is how we detect when the key is released.
128 /* Scan the hardware keyboard and push any changes up through the input layer */
129 static void locomokbd_scankeyboard(struct locomokbd *locomokbd)
131 unsigned int row, col, rowd, scancode;
132 unsigned long flags;
133 unsigned int num_pressed;
134 unsigned long membase = locomokbd->base;
136 spin_lock_irqsave(&locomokbd->lock, flags);
138 locomokbd_charge_all(membase);
140 num_pressed = 0;
141 for (col = 0; col < KB_COLS; col++) {
143 locomokbd_activate_col(membase, col);
144 udelay(KB_DELAY);
146 rowd = ~locomo_readl(membase + LOCOMO_KIB);
147 for (row = 0; row < KB_ROWS; row++) {
148 scancode = SCANCODE(col, row);
149 if (rowd & KB_ROWMASK(row)) {
150 num_pressed += 1;
151 input_report_key(locomokbd->input, locomokbd->keycode[scancode], 1);
152 } else {
153 input_report_key(locomokbd->input, locomokbd->keycode[scancode], 0);
156 locomokbd_reset_col(membase, col);
158 locomokbd_activate_all(membase);
160 input_sync(locomokbd->input);
162 /* if any keys are pressed, enable the timer */
163 if (num_pressed)
164 mod_timer(&locomokbd->timer, jiffies + SCAN_INTERVAL);
166 spin_unlock_irqrestore(&locomokbd->lock, flags);
170 * LoCoMo keyboard interrupt handler.
172 static irqreturn_t locomokbd_interrupt(int irq, void *dev_id)
174 struct locomokbd *locomokbd = dev_id;
175 /** wait chattering delay **/
176 udelay(100);
178 locomokbd_scankeyboard(locomokbd);
180 return IRQ_HANDLED;
184 * LoCoMo timer checking for released keys
186 static void locomokbd_timer_callback(unsigned long data)
188 struct locomokbd *locomokbd = (struct locomokbd *) data;
189 locomokbd_scankeyboard(locomokbd);
192 static int locomokbd_probe(struct locomo_dev *dev)
194 struct locomokbd *locomokbd;
195 struct input_dev *input_dev;
196 int i, err;
198 locomokbd = kzalloc(sizeof(struct locomokbd), GFP_KERNEL);
199 input_dev = input_allocate_device();
200 if (!locomokbd || !input_dev) {
201 err = -ENOMEM;
202 goto err_free_mem;
205 /* try and claim memory region */
206 if (!request_mem_region((unsigned long) dev->mapbase,
207 dev->length,
208 LOCOMO_DRIVER_NAME(dev))) {
209 err = -EBUSY;
210 printk(KERN_ERR "locomokbd: Can't acquire access to io memory for keyboard\n");
211 goto err_free_mem;
214 locomokbd->ldev = dev;
215 locomo_set_drvdata(dev, locomokbd);
217 locomokbd->base = (unsigned long) dev->mapbase;
219 spin_lock_init(&locomokbd->lock);
221 init_timer(&locomokbd->timer);
222 locomokbd->timer.function = locomokbd_timer_callback;
223 locomokbd->timer.data = (unsigned long) locomokbd;
225 locomokbd->input = input_dev;
226 strcpy(locomokbd->phys, "locomokbd/input0");
228 input_dev->name = "LoCoMo keyboard";
229 input_dev->phys = locomokbd->phys;
230 input_dev->id.bustype = BUS_HOST;
231 input_dev->id.vendor = 0x0001;
232 input_dev->id.product = 0x0001;
233 input_dev->id.version = 0x0100;
234 input_dev->dev.parent = &dev->dev;
236 input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REP);
237 input_dev->keycode = locomokbd->keycode;
238 input_dev->keycodesize = sizeof(unsigned char);
239 input_dev->keycodemax = ARRAY_SIZE(locomokbd_keycode);
241 memcpy(locomokbd->keycode, locomokbd_keycode, sizeof(locomokbd->keycode));
242 for (i = 0; i < LOCOMOKBD_NUMKEYS; i++)
243 set_bit(locomokbd->keycode[i], input_dev->keybit);
244 clear_bit(0, input_dev->keybit);
246 /* attempt to get the interrupt */
247 err = request_irq(dev->irq[0], locomokbd_interrupt, 0, "locomokbd", locomokbd);
248 if (err) {
249 printk(KERN_ERR "locomokbd: Can't get irq for keyboard\n");
250 goto err_release_region;
253 err = input_register_device(locomokbd->input);
254 if (err)
255 goto err_free_irq;
257 return 0;
259 err_free_irq:
260 free_irq(dev->irq[0], locomokbd);
261 err_release_region:
262 release_mem_region((unsigned long) dev->mapbase, dev->length);
263 locomo_set_drvdata(dev, NULL);
264 err_free_mem:
265 input_free_device(input_dev);
266 kfree(locomokbd);
268 return err;
271 static int locomokbd_remove(struct locomo_dev *dev)
273 struct locomokbd *locomokbd = locomo_get_drvdata(dev);
275 free_irq(dev->irq[0], locomokbd);
277 del_timer_sync(&locomokbd->timer);
279 input_unregister_device(locomokbd->input);
280 locomo_set_drvdata(dev, NULL);
282 release_mem_region((unsigned long) dev->mapbase, dev->length);
284 kfree(locomokbd);
286 return 0;
289 static struct locomo_driver keyboard_driver = {
290 .drv = {
291 .name = "locomokbd"
293 .devid = LOCOMO_DEVID_KEYBOARD,
294 .probe = locomokbd_probe,
295 .remove = locomokbd_remove,
298 static int __init locomokbd_init(void)
300 return locomo_driver_register(&keyboard_driver);
303 static void __exit locomokbd_exit(void)
305 locomo_driver_unregister(&keyboard_driver);
308 module_init(locomokbd_init);
309 module_exit(locomokbd_exit);