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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
43static void omap_kp_tasklet(unsigned long);
44static void omap_kp_timer(struct timer_list *);
45
46static unsigned char keypad_state[8];
47static DEFINE_MUTEX(kp_enable_mutex);
48static int kp_enable = 1;
49static int kp_cur_group = -1;
50
51struct 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
62static DECLARE_TASKLET_DISABLED(kp_tasklet, omap_kp_tasklet, 0);
63
64static unsigned int *row_gpios;
65static unsigned int *col_gpios;
66
67static 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
77static void omap_kp_timer(struct timer_list *unused)
78{
79 tasklet_schedule(&kp_tasklet);
80}
81
82static 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
104static 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
157static 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
163static 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
188static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, omap_kp_enable_show, omap_kp_enable_store);
189
190static 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 timer_setup(&omap_kp->timer, omap_kp_timer, 0);
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
286err4:
287 input_unregister_device(omap_kp->input);
288 input_dev = NULL;
289err3:
290 device_remove_file(&pdev->dev, &dev_attr_enable);
291err2:
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
303static 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
323static struct platform_driver omap_kp_driver = {
324 .probe = omap_kp_probe,
325 .remove = omap_kp_remove,
326 .driver = {
327 .name = "omap-keypad",
328 },
329};
330module_platform_driver(omap_kp_driver);
331
332MODULE_AUTHOR("Timo Teräs");
333MODULE_DESCRIPTION("OMAP Keypad Driver");
334MODULE_LICENSE("GPL");
335MODULE_ALIAS("platform:omap-keypad");
336

Warning: That file was not part of the compilation database. It may have many parsing errors.