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27#include <linux/module.h>
28#include <linux/init.h>
29#include <linux/interrupt.h>
30#include <linux/types.h>
31#include <linux/input.h>
32#include <linux/kernel.h>
33#include <linux/delay.h>
34#include <linux/platform_device.h>
35#include <linux/mutex.h>
36#include <linux/errno.h>
37#include <linux/slab.h>
38#include <asm/gpio.h>
39#include <plat/keypad.h>
40#include <plat/menelaus.h>
41#include <asm/irq.h>
42#include <mach/hardware.h>
43#include <asm/io.h>
44#include <plat/mux.h>
45
46#undef NEW_BOARD_LEARNING_MODE
47
48static void omap_kp_tasklet(unsigned long);
49static void omap_kp_timer(unsigned long);
50
51static unsigned char keypad_state[8];
52static DEFINE_MUTEX(kp_enable_mutex);
53static int kp_enable = 1;
54static int kp_cur_group = -1;
55
56struct omap_kp {
57 struct input_dev *input;
58 struct timer_list timer;
59 int irq;
60 unsigned int rows;
61 unsigned int cols;
62 unsigned long delay;
63 unsigned int debounce;
64 unsigned short keymap[];
65};
66
67static DECLARE_TASKLET_DISABLED(kp_tasklet, omap_kp_tasklet, 0);
68
69static unsigned int *row_gpios;
70static unsigned int *col_gpios;
71
72#ifdef CONFIG_ARCH_OMAP2
73static void set_col_gpio_val(struct omap_kp *omap_kp, u8 value)
74{
75 int col;
76
77 for (col = 0; col < omap_kp->cols; col++)
78 gpio_set_value(col_gpios[col], value & (1 << col));
79}
80
81static u8 get_row_gpio_val(struct omap_kp *omap_kp)
82{
83 int row;
84 u8 value = 0;
85
86 for (row = 0; row < omap_kp->rows; row++) {
87 if (gpio_get_value(row_gpios[row]))
88 value |= (1 << row);
89 }
90 return value;
91}
92#else
93#define set_col_gpio_val(x, y) do {} while (0)
94#define get_row_gpio_val(x) 0
95#endif
96
97static irqreturn_t omap_kp_interrupt(int irq, void *dev_id)
98{
99 struct omap_kp *omap_kp = dev_id;
100
101
102 if (cpu_is_omap24xx()) {
103 int i;
104
105 for (i = 0; i < omap_kp->rows; i++) {
106 int gpio_irq = gpio_to_irq(row_gpios[i]);
107
108
109
110
111
112
113 if (gpio_irq == irq)
114 disable_irq_nosync(gpio_irq);
115 else
116 disable_irq(gpio_irq);
117 }
118 } else
119
120 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
121
122 tasklet_schedule(&kp_tasklet);
123
124 return IRQ_HANDLED;
125}
126
127static void omap_kp_timer(unsigned long data)
128{
129 tasklet_schedule(&kp_tasklet);
130}
131
132static void omap_kp_scan_keypad(struct omap_kp *omap_kp, unsigned char *state)
133{
134 int col = 0;
135
136
137 if (cpu_is_omap24xx()) {
138
139 for (col = 0; col < omap_kp->cols; col++) {
140 set_col_gpio_val(omap_kp, ~(1 << col));
141 state[col] = ~(get_row_gpio_val(omap_kp)) & 0xff;
142 }
143 set_col_gpio_val(omap_kp, 0);
144
145 } else {
146
147 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
148
149
150 omap_writew(0xff, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC);
151 for (col = 0; col < omap_kp->cols; col++) {
152 omap_writew(~(1 << col) & 0xff,
153 OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC);
154
155 udelay(omap_kp->delay);
156
157 state[col] = ~omap_readw(OMAP1_MPUIO_BASE +
158 OMAP_MPUIO_KBR_LATCH) & 0xff;
159 }
160 omap_writew(0x00, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC);
161 udelay(2);
162 }
163}
164
165static void omap_kp_tasklet(unsigned long data)
166{
167 struct omap_kp *omap_kp_data = (struct omap_kp *) data;
168 unsigned short *keycodes = omap_kp_data->input->keycode;
169 unsigned int row_shift = get_count_order(omap_kp_data->cols);
170 unsigned char new_state[8], changed, key_down = 0;
171 int col, row;
172 int spurious = 0;
173
174
175 omap_kp_scan_keypad(omap_kp_data, new_state);
176
177
178 for (col = 0; col < omap_kp_data->cols; col++) {
179 changed = new_state[col] ^ keypad_state[col];
180 key_down |= new_state[col];
181 if (changed == 0)
182 continue;
183
184 for (row = 0; row < omap_kp_data->rows; row++) {
185 int key;
186 if (!(changed & (1 << row)))
187 continue;
188#ifdef NEW_BOARD_LEARNING_MODE
189 printk(KERN_INFO "omap-keypad: key %d-%d %s\n", col,
190 row, (new_state[col] & (1 << row)) ?
191 "pressed" : "released");
192#else
193 key = keycodes[MATRIX_SCAN_CODE(row, col, row_shift)];
194 if (key < 0) {
195 printk(KERN_WARNING
196 "omap-keypad: Spurious key event %d-%d\n",
197 col, row);
198
199 spurious = 1;
200 continue;
201 }
202
203 if (!(kp_cur_group == (key & GROUP_MASK) ||
204 kp_cur_group == -1))
205 continue;
206
207 kp_cur_group = key & GROUP_MASK;
208 input_report_key(omap_kp_data->input, key & ~GROUP_MASK,
209 new_state[col] & (1 << row));
210#endif
211 }
212 }
213 input_sync(omap_kp_data->input);
214 memcpy(keypad_state, new_state, sizeof(keypad_state));
215
216 if (key_down) {
217 int delay = HZ / 20;
218
219
220 if (spurious)
221 delay = 2 * HZ;
222 mod_timer(&omap_kp_data->timer, jiffies + delay);
223 } else {
224
225 if (cpu_is_omap24xx()) {
226 int i;
227 for (i = 0; i < omap_kp_data->rows; i++)
228 enable_irq(gpio_to_irq(row_gpios[i]));
229 } else {
230 omap_writew(0, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
231 kp_cur_group = -1;
232 }
233 }
234}
235
236static ssize_t omap_kp_enable_show(struct device *dev,
237 struct device_attribute *attr, char *buf)
238{
239 return sprintf(buf, "%u\n", kp_enable);
240}
241
242static ssize_t omap_kp_enable_store(struct device *dev, struct device_attribute *attr,
243 const char *buf, size_t count)
244{
245 int state;
246
247 if (sscanf(buf, "%u", &state) != 1)
248 return -EINVAL;
249
250 if ((state != 1) && (state != 0))
251 return -EINVAL;
252
253 mutex_lock(&kp_enable_mutex);
254 if (state != kp_enable) {
255 if (state)
256 enable_irq(INT_KEYBOARD);
257 else
258 disable_irq(INT_KEYBOARD);
259 kp_enable = state;
260 }
261 mutex_unlock(&kp_enable_mutex);
262
263 return strnlen(buf, count);
264}
265
266static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, omap_kp_enable_show, omap_kp_enable_store);
267
268#ifdef CONFIG_PM
269static int omap_kp_suspend(struct platform_device *dev, pm_message_t state)
270{
271
272
273 return 0;
274}
275
276static int omap_kp_resume(struct platform_device *dev)
277{
278
279
280 return 0;
281}
282#else
283#define omap_kp_suspend NULL
284#define omap_kp_resume NULL
285#endif
286
287static int __devinit omap_kp_probe(struct platform_device *pdev)
288{
289 struct omap_kp *omap_kp;
290 struct input_dev *input_dev;
291 struct omap_kp_platform_data *pdata = pdev->dev.platform_data;
292 int i, col_idx, row_idx, irq_idx, ret;
293 unsigned int row_shift, keycodemax;
294
295 if (!pdata->rows || !pdata->cols || !pdata->keymap_data) {
296 printk(KERN_ERR "No rows, cols or keymap_data from pdata\n");
297 return -EINVAL;
298 }
299
300 row_shift = get_count_order(pdata->cols);
301 keycodemax = pdata->rows << row_shift;
302
303 omap_kp = kzalloc(sizeof(struct omap_kp) +
304 keycodemax * sizeof(unsigned short), GFP_KERNEL);
305 input_dev = input_allocate_device();
306 if (!omap_kp || !input_dev) {
307 kfree(omap_kp);
308 input_free_device(input_dev);
309 return -ENOMEM;
310 }
311
312 platform_set_drvdata(pdev, omap_kp);
313
314 omap_kp->input = input_dev;
315
316
317 if (!cpu_is_omap24xx())
318 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
319
320 if (pdata->delay)
321 omap_kp->delay = pdata->delay;
322
323 if (pdata->row_gpios && pdata->col_gpios) {
324 row_gpios = pdata->row_gpios;
325 col_gpios = pdata->col_gpios;
326 }
327
328 omap_kp->rows = pdata->rows;
329 omap_kp->cols = pdata->cols;
330
331 if (cpu_is_omap24xx()) {
332
333 for (col_idx = 0; col_idx < omap_kp->cols; col_idx++) {
334 if (gpio_request(col_gpios[col_idx], "omap_kp_col") < 0) {
335 printk(KERN_ERR "Failed to request"
336 "GPIO%d for keypad\n",
337 col_gpios[col_idx]);
338 goto err1;
339 }
340 gpio_direction_output(col_gpios[col_idx], 0);
341 }
342
343 for (row_idx = 0; row_idx < omap_kp->rows; row_idx++) {
344 if (gpio_request(row_gpios[row_idx], "omap_kp_row") < 0) {
345 printk(KERN_ERR "Failed to request"
346 "GPIO%d for keypad\n",
347 row_gpios[row_idx]);
348 goto err2;
349 }
350 gpio_direction_input(row_gpios[row_idx]);
351 }
352 } else {
353 col_idx = 0;
354 row_idx = 0;
355 }
356
357 setup_timer(&omap_kp->timer, omap_kp_timer, (unsigned long)omap_kp);
358
359
360 tasklet_enable(&kp_tasklet);
361 kp_tasklet.data = (unsigned long) omap_kp;
362
363 ret = device_create_file(&pdev->dev, &dev_attr_enable);
364 if (ret < 0)
365 goto err2;
366
367
368 input_dev->name = "omap-keypad";
369 input_dev->phys = "omap-keypad/input0";
370 input_dev->dev.parent = &pdev->dev;
371
372 input_dev->id.bustype = BUS_HOST;
373 input_dev->id.vendor = 0x0001;
374 input_dev->id.product = 0x0001;
375 input_dev->id.version = 0x0100;
376
377 if (pdata->rep)
378 __set_bit(EV_REP, input_dev->evbit);
379
380 ret = matrix_keypad_build_keymap(pdata->keymap_data, NULL,
381 pdata->rows, pdata->cols,
382 omap_kp->keymap, input_dev);
383 if (ret < 0)
384 goto err3;
385
386 ret = input_register_device(omap_kp->input);
387 if (ret < 0) {
388 printk(KERN_ERR "Unable to register omap-keypad input device\n");
389 goto err3;
390 }
391
392 if (pdata->dbounce)
393 omap_writew(0xff, OMAP1_MPUIO_BASE + OMAP_MPUIO_GPIO_DEBOUNCING);
394
395
396 omap_kp_scan_keypad(omap_kp, keypad_state);
397 if (!cpu_is_omap24xx()) {
398 omap_kp->irq = platform_get_irq(pdev, 0);
399 if (omap_kp->irq >= 0) {
400 if (request_irq(omap_kp->irq, omap_kp_interrupt, 0,
401 "omap-keypad", omap_kp) < 0)
402 goto err4;
403 }
404 omap_writew(0, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
405 } else {
406 for (irq_idx = 0; irq_idx < omap_kp->rows; irq_idx++) {
407 if (request_irq(gpio_to_irq(row_gpios[irq_idx]),
408 omap_kp_interrupt,
409 IRQF_TRIGGER_FALLING,
410 "omap-keypad", omap_kp) < 0)
411 goto err5;
412 }
413 }
414 return 0;
415err5:
416 for (i = irq_idx - 1; i >=0; i--)
417 free_irq(row_gpios[i], omap_kp);
418err4:
419 input_unregister_device(omap_kp->input);
420 input_dev = NULL;
421err3:
422 device_remove_file(&pdev->dev, &dev_attr_enable);
423err2:
424 for (i = row_idx - 1; i >=0; i--)
425 gpio_free(row_gpios[i]);
426err1:
427 for (i = col_idx - 1; i >=0; i--)
428 gpio_free(col_gpios[i]);
429
430 kfree(omap_kp);
431 input_free_device(input_dev);
432
433 return -EINVAL;
434}
435
436static int __devexit omap_kp_remove(struct platform_device *pdev)
437{
438 struct omap_kp *omap_kp = platform_get_drvdata(pdev);
439
440
441 tasklet_disable(&kp_tasklet);
442 if (cpu_is_omap24xx()) {
443 int i;
444 for (i = 0; i < omap_kp->cols; i++)
445 gpio_free(col_gpios[i]);
446 for (i = 0; i < omap_kp->rows; i++) {
447 gpio_free(row_gpios[i]);
448 free_irq(gpio_to_irq(row_gpios[i]), omap_kp);
449 }
450 } else {
451 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
452 free_irq(omap_kp->irq, omap_kp);
453 }
454
455 del_timer_sync(&omap_kp->timer);
456 tasklet_kill(&kp_tasklet);
457
458
459 input_unregister_device(omap_kp->input);
460
461 kfree(omap_kp);
462
463 return 0;
464}
465
466static struct platform_driver omap_kp_driver = {
467 .probe = omap_kp_probe,
468 .remove = __devexit_p(omap_kp_remove),
469 .suspend = omap_kp_suspend,
470 .resume = omap_kp_resume,
471 .driver = {
472 .name = "omap-keypad",
473 .owner = THIS_MODULE,
474 },
475};
476module_platform_driver(omap_kp_driver);
477
478MODULE_AUTHOR("Timo Teräs");
479MODULE_DESCRIPTION("OMAP Keypad Driver");
480MODULE_LICENSE("GPL");
481MODULE_ALIAS("platform:omap-keypad");
482
