1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
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(unsigned long);
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
67#ifdef CONFIG_ARCH_OMAP2
68static void set_col_gpio_val(struct omap_kp *omap_kp, u8 value)
69{
70 int col;
71
72 for (col = 0; col < omap_kp->cols; col++)
73 gpio_set_value(col_gpios[col], value & (1 << col));
74}
75
76static u8 get_row_gpio_val(struct omap_kp *omap_kp)
77{
78 int row;
79 u8 value = 0;
80
81 for (row = 0; row < omap_kp->rows; row++) {
82 if (gpio_get_value(row_gpios[row]))
83 value |= (1 << row);
84 }
85 return value;
86}
87#else
88#define set_col_gpio_val(x, y) do {} while (0)
89#define get_row_gpio_val(x) 0
90#endif
91
92static irqreturn_t omap_kp_interrupt(int irq, void *dev_id)
93{
94
95 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
96
97 tasklet_schedule(&kp_tasklet);
98
99 return IRQ_HANDLED;
100}
101
102static void omap_kp_timer(unsigned long data)
103{
104 tasklet_schedule(&kp_tasklet);
105}
106
107static void omap_kp_scan_keypad(struct omap_kp *omap_kp, unsigned char *state)
108{
109 int col = 0;
110
111
112 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
113
114
115 omap_writew(0xff, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC);
116 for (col = 0; col < omap_kp->cols; col++) {
117 omap_writew(~(1 << col) & 0xff,
118 OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC);
119
120 udelay(omap_kp->delay);
121
122 state[col] = ~omap_readw(OMAP1_MPUIO_BASE +
123 OMAP_MPUIO_KBR_LATCH) & 0xff;
124 }
125 omap_writew(0x00, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC);
126 udelay(2);
127}
128
129static void omap_kp_tasklet(unsigned long data)
130{
131 struct omap_kp *omap_kp_data = (struct omap_kp *) data;
132 unsigned short *keycodes = omap_kp_data->input->keycode;
133 unsigned int row_shift = get_count_order(omap_kp_data->cols);
134 unsigned char new_state[8], changed, key_down = 0;
135 int col, row;
136 int spurious = 0;
137
138
139 omap_kp_scan_keypad(omap_kp_data, new_state);
140
141
142 for (col = 0; col < omap_kp_data->cols; col++) {
143 changed = new_state[col] ^ keypad_state[col];
144 key_down |= new_state[col];
145 if (changed == 0)
146 continue;
147
148 for (row = 0; row < omap_kp_data->rows; row++) {
149 int key;
150 if (!(changed & (1 << row)))
151 continue;
152#ifdef NEW_BOARD_LEARNING_MODE
153 printk(KERN_INFO "omap-keypad: key %d-%d %s\n", col,
154 row, (new_state[col] & (1 << row)) ?
155 "pressed" : "released");
156#else
157 key = keycodes[MATRIX_SCAN_CODE(row, col, row_shift)];
158 if (key < 0) {
159 printk(KERN_WARNING
160 "omap-keypad: Spurious key event %d-%d\n",
161 col, row);
162
163 spurious = 1;
164 continue;
165 }
166
167 if (!(kp_cur_group == (key & GROUP_MASK) ||
168 kp_cur_group == -1))
169 continue;
170
171 kp_cur_group = key & GROUP_MASK;
172 input_report_key(omap_kp_data->input, key & ~GROUP_MASK,
173 new_state[col] & (1 << row));
174#endif
175 }
176 }
177 input_sync(omap_kp_data->input);
178 memcpy(keypad_state, new_state, sizeof(keypad_state));
179
180 if (key_down) {
181 int delay = HZ / 20;
182
183
184 if (spurious)
185 delay = 2 * HZ;
186 mod_timer(&omap_kp_data->timer, jiffies + delay);
187 } else {
188
189 omap_writew(0, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
190 kp_cur_group = -1;
191 }
192}
193
194static ssize_t omap_kp_enable_show(struct device *dev,
195 struct device_attribute *attr, char *buf)
196{
197 return sprintf(buf, "%u\n", kp_enable);
198}
199
200static ssize_t omap_kp_enable_store(struct device *dev, struct device_attribute *attr,
201 const char *buf, size_t count)
202{
203 struct omap_kp *omap_kp = dev_get_drvdata(dev);
204 int state;
205
206 if (sscanf(buf, "%u", &state) != 1)
207 return -EINVAL;
208
209 if ((state != 1) && (state != 0))
210 return -EINVAL;
211
212 mutex_lock(&kp_enable_mutex);
213 if (state != kp_enable) {
214 if (state)
215 enable_irq(omap_kp->irq);
216 else
217 disable_irq(omap_kp->irq);
218 kp_enable = state;
219 }
220 mutex_unlock(&kp_enable_mutex);
221
222 return strnlen(buf, count);
223}
224
225static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, omap_kp_enable_show, omap_kp_enable_store);
226
227#ifdef CONFIG_PM
228static int omap_kp_suspend(struct platform_device *dev, pm_message_t state)
229{
230
231
232 return 0;
233}
234
235static int omap_kp_resume(struct platform_device *dev)
236{
237
238
239 return 0;
240}
241#else
242#define omap_kp_suspend NULL
243#define omap_kp_resume NULL
244#endif
245
246static int omap_kp_probe(struct platform_device *pdev)
247{
248 struct omap_kp *omap_kp;
249 struct input_dev *input_dev;
250 struct omap_kp_platform_data *pdata = dev_get_platdata(&pdev->dev);
251 int i, col_idx, row_idx, ret;
252 unsigned int row_shift, keycodemax;
253
254 if (!pdata->rows || !pdata->cols || !pdata->keymap_data) {
255 printk(KERN_ERR "No rows, cols or keymap_data from pdata\n");
256 return -EINVAL;
257 }
258
259 row_shift = get_count_order(pdata->cols);
260 keycodemax = pdata->rows << row_shift;
261
262 omap_kp = kzalloc(sizeof(struct omap_kp) +
263 keycodemax * sizeof(unsigned short), GFP_KERNEL);
264 input_dev = input_allocate_device();
265 if (!omap_kp || !input_dev) {
266 kfree(omap_kp);
267 input_free_device(input_dev);
268 return -ENOMEM;
269 }
270
271 platform_set_drvdata(pdev, omap_kp);
272
273 omap_kp->input = input_dev;
274
275
276 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
277
278 if (pdata->delay)
279 omap_kp->delay = pdata->delay;
280
281 if (pdata->row_gpios && pdata->col_gpios) {
282 row_gpios = pdata->row_gpios;
283 col_gpios = pdata->col_gpios;
284 }
285
286 omap_kp->rows = pdata->rows;
287 omap_kp->cols = pdata->cols;
288
289 col_idx = 0;
290 row_idx = 0;
291
292 setup_timer(&omap_kp->timer, omap_kp_timer, (unsigned long)omap_kp);
293
294
295 tasklet_enable(&kp_tasklet);
296 kp_tasklet.data = (unsigned long) omap_kp;
297
298 ret = device_create_file(&pdev->dev, &dev_attr_enable);
299 if (ret < 0)
300 goto err2;
301
302
303 input_dev->name = "omap-keypad";
304 input_dev->phys = "omap-keypad/input0";
305 input_dev->dev.parent = &pdev->dev;
306
307 input_dev->id.bustype = BUS_HOST;
308 input_dev->id.vendor = 0x0001;
309 input_dev->id.product = 0x0001;
310 input_dev->id.version = 0x0100;
311
312 if (pdata->rep)
313 __set_bit(EV_REP, input_dev->evbit);
314
315 ret = matrix_keypad_build_keymap(pdata->keymap_data, NULL,
316 pdata->rows, pdata->cols,
317 omap_kp->keymap, input_dev);
318 if (ret < 0)
319 goto err3;
320
321 ret = input_register_device(omap_kp->input);
322 if (ret < 0) {
323 printk(KERN_ERR "Unable to register omap-keypad input device\n");
324 goto err3;
325 }
326
327 if (pdata->dbounce)
328 omap_writew(0xff, OMAP1_MPUIO_BASE + OMAP_MPUIO_GPIO_DEBOUNCING);
329
330
331 omap_kp_scan_keypad(omap_kp, keypad_state);
332 omap_kp->irq = platform_get_irq(pdev, 0);
333 if (omap_kp->irq >= 0) {
334 if (request_irq(omap_kp->irq, omap_kp_interrupt, 0,
335 "omap-keypad", omap_kp) < 0)
336 goto err4;
337 }
338 omap_writew(0, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
339
340 return 0;
341
342err4:
343 input_unregister_device(omap_kp->input);
344 input_dev = NULL;
345err3:
346 device_remove_file(&pdev->dev, &dev_attr_enable);
347err2:
348 for (i = row_idx - 1; i >= 0; i--)
349 gpio_free(row_gpios[i]);
350 for (i = col_idx - 1; i >= 0; i--)
351 gpio_free(col_gpios[i]);
352
353 kfree(omap_kp);
354 input_free_device(input_dev);
355
356 return -EINVAL;
357}
358
359static int omap_kp_remove(struct platform_device *pdev)
360{
361 struct omap_kp *omap_kp = platform_get_drvdata(pdev);
362
363
364 tasklet_disable(&kp_tasklet);
365 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
366 free_irq(omap_kp->irq, omap_kp);
367
368 del_timer_sync(&omap_kp->timer);
369 tasklet_kill(&kp_tasklet);
370
371
372 input_unregister_device(omap_kp->input);
373
374 kfree(omap_kp);
375
376 return 0;
377}
378
379static struct platform_driver omap_kp_driver = {
380 .probe = omap_kp_probe,
381 .remove = omap_kp_remove,
382 .suspend = omap_kp_suspend,
383 .resume = omap_kp_resume,
384 .driver = {
385 .name = "omap-keypad",
386 .owner = THIS_MODULE,
387 },
388};
389module_platform_driver(omap_kp_driver);
390
391MODULE_AUTHOR("Timo Teräs");
392MODULE_DESCRIPTION("OMAP Keypad Driver");
393MODULE_LICENSE("GPL");
394MODULE_ALIAS("platform:omap-keypad");
395
