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28#include <linux/kernel.h>
29#include <linux/module.h>
30#include <linux/init.h>
31#include <linux/interrupt.h>
32#include <linux/input.h>
33#include <linux/platform_device.h>
34#include <linux/i2c/twl4030.h>
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51#define TWL4030_MAX_ROWS 8
52#define TWL4030_MAX_COLS 8
53#define TWL4030_ROW_SHIFT 3
54#define TWL4030_KEYMAP_SIZE (TWL4030_MAX_ROWS * TWL4030_MAX_COLS)
55
56struct twl4030_keypad {
57 unsigned short keymap[TWL4030_KEYMAP_SIZE];
58 u16 kp_state[TWL4030_MAX_ROWS];
59 unsigned n_rows;
60 unsigned n_cols;
61 unsigned irq;
62
63 struct device *dbg_dev;
64 struct input_dev *input;
65};
66
67
68
69
70#define PTV_PRESCALER 4
71
72
73#define KEYP_CTRL 0x00
74#define KEYP_DEB 0x01
75#define KEYP_LONG_KEY 0x02
76#define KEYP_LK_PTV 0x03
77#define KEYP_TIMEOUT_L 0x04
78#define KEYP_TIMEOUT_H 0x05
79#define KEYP_KBC 0x06
80#define KEYP_KBR 0x07
81#define KEYP_SMS 0x08
82#define KEYP_FULL_CODE_7_0 0x09
83#define KEYP_FULL_CODE_15_8 0x0a
84#define KEYP_FULL_CODE_23_16 0x0b
85#define KEYP_FULL_CODE_31_24 0x0c
86#define KEYP_FULL_CODE_39_32 0x0d
87#define KEYP_FULL_CODE_47_40 0x0e
88#define KEYP_FULL_CODE_55_48 0x0f
89#define KEYP_FULL_CODE_63_56 0x10
90#define KEYP_ISR1 0x11
91#define KEYP_IMR1 0x12
92#define KEYP_ISR2 0x13
93#define KEYP_IMR2 0x14
94#define KEYP_SIR 0x15
95#define KEYP_EDR 0x16
96#define KEYP_SIH_CTRL 0x17
97
98
99#define KEYP_CTRL_SOFT_NRST BIT(0)
100#define KEYP_CTRL_SOFTMODEN BIT(1)
101#define KEYP_CTRL_LK_EN BIT(2)
102#define KEYP_CTRL_TOE_EN BIT(3)
103#define KEYP_CTRL_TOLE_EN BIT(4)
104#define KEYP_CTRL_RP_EN BIT(5)
105#define KEYP_CTRL_KBD_ON BIT(6)
106
107
108#define KEYP_PERIOD_US(t, prescale) ((t) / (31 << (prescale + 1)) - 1)
109
110
111#define KEYP_LK_PTV_PTV_SHIFT 5
112
113
114#define KEYP_IMR1_MIS BIT(3)
115#define KEYP_IMR1_TO BIT(2)
116#define KEYP_IMR1_LK BIT(1)
117#define KEYP_IMR1_KP BIT(0)
118
119
120#define KEYP_EDR_KP_FALLING 0x01
121#define KEYP_EDR_KP_RISING 0x02
122#define KEYP_EDR_KP_BOTH 0x03
123#define KEYP_EDR_LK_FALLING 0x04
124#define KEYP_EDR_LK_RISING 0x08
125#define KEYP_EDR_TO_FALLING 0x10
126#define KEYP_EDR_TO_RISING 0x20
127#define KEYP_EDR_MIS_FALLING 0x40
128#define KEYP_EDR_MIS_RISING 0x80
129
130
131
132
133static int twl4030_kpread(struct twl4030_keypad *kp,
134 u8 *data, u32 reg, u8 num_bytes)
135{
136 int ret = twl4030_i2c_read(TWL4030_MODULE_KEYPAD, data, reg, num_bytes);
137
138 if (ret < 0)
139 dev_warn(kp->dbg_dev,
140 "Couldn't read TWL4030: %X - ret %d[%x]\n",
141 reg, ret, ret);
142
143 return ret;
144}
145
146static int twl4030_kpwrite_u8(struct twl4030_keypad *kp, u8 data, u32 reg)
147{
148 int ret = twl4030_i2c_write_u8(TWL4030_MODULE_KEYPAD, data, reg);
149
150 if (ret < 0)
151 dev_warn(kp->dbg_dev,
152 "Could not write TWL4030: %X - ret %d[%x]\n",
153 reg, ret, ret);
154
155 return ret;
156}
157
158static inline u16 twl4030_col_xlate(struct twl4030_keypad *kp, u8 col)
159{
160
161
162
163
164
165 if (col == 0xFF)
166 return 1 << kp->n_cols;
167 else
168 return col & ((1 << kp->n_cols) - 1);
169}
170
171static int twl4030_read_kp_matrix_state(struct twl4030_keypad *kp, u16 *state)
172{
173 u8 new_state[TWL4030_MAX_ROWS];
174 int row;
175 int ret = twl4030_kpread(kp, new_state,
176 KEYP_FULL_CODE_7_0, kp->n_rows);
177 if (ret >= 0)
178 for (row = 0; row < kp->n_rows; row++)
179 state[row] = twl4030_col_xlate(kp, new_state[row]);
180
181 return ret;
182}
183
184static int twl4030_is_in_ghost_state(struct twl4030_keypad *kp, u16 *key_state)
185{
186 int i;
187 u16 check = 0;
188
189 for (i = 0; i < kp->n_rows; i++) {
190 u16 col = key_state[i];
191
192 if ((col & check) && hweight16(col) > 1)
193 return 1;
194
195 check |= col;
196 }
197
198 return 0;
199}
200
201static void twl4030_kp_scan(struct twl4030_keypad *kp, bool release_all)
202{
203 struct input_dev *input = kp->input;
204 u16 new_state[TWL4030_MAX_ROWS];
205 int col, row;
206
207 if (release_all)
208 memset(new_state, 0, sizeof(new_state));
209 else {
210
211 int ret = twl4030_read_kp_matrix_state(kp, new_state);
212
213 if (ret < 0)
214 return;
215
216 if (twl4030_is_in_ghost_state(kp, new_state))
217 return;
218 }
219
220
221 for (row = 0; row < kp->n_rows; row++) {
222 int changed = new_state[row] ^ kp->kp_state[row];
223
224 if (!changed)
225 continue;
226
227 for (col = 0; col < kp->n_cols; col++) {
228 int code;
229
230 if (!(changed & (1 << col)))
231 continue;
232
233 dev_dbg(kp->dbg_dev, "key [%d:%d] %s\n", row, col,
234 (new_state[row] & (1 << col)) ?
235 "press" : "release");
236
237 code = MATRIX_SCAN_CODE(row, col, TWL4030_ROW_SHIFT);
238 input_event(input, EV_MSC, MSC_SCAN, code);
239 input_report_key(input, kp->keymap[code],
240 new_state[row] & (1 << col));
241 }
242 kp->kp_state[row] = new_state[row];
243 }
244 input_sync(input);
245}
246
247
248
249
250static irqreturn_t do_kp_irq(int irq, void *_kp)
251{
252 struct twl4030_keypad *kp = _kp;
253 u8 reg;
254 int ret;
255
256#ifdef CONFIG_LOCKDEP
257
258
259
260
261 local_irq_enable();
262#endif
263
264
265 ret = twl4030_kpread(kp, ®, KEYP_ISR1, 1);
266
267
268
269 if (ret >= 0 && (reg & KEYP_IMR1_KP))
270 twl4030_kp_scan(kp, false);
271 else
272 twl4030_kp_scan(kp, true);
273
274 return IRQ_HANDLED;
275}
276
277static int __devinit twl4030_kp_program(struct twl4030_keypad *kp)
278{
279 u8 reg;
280 int i;
281
282
283 reg = KEYP_CTRL_SOFT_NRST | KEYP_CTRL_SOFTMODEN
284 | KEYP_CTRL_TOE_EN | KEYP_CTRL_KBD_ON;
285 if (twl4030_kpwrite_u8(kp, reg, KEYP_CTRL) < 0)
286 return -EIO;
287
288
289
290
291
292
293 reg = KEYP_EDR_KP_BOTH | KEYP_EDR_TO_RISING;
294 if (twl4030_kpwrite_u8(kp, reg, KEYP_EDR) < 0)
295 return -EIO;
296
297
298 reg = (PTV_PRESCALER << KEYP_LK_PTV_PTV_SHIFT);
299 if (twl4030_kpwrite_u8(kp, reg, KEYP_LK_PTV) < 0)
300 return -EIO;
301
302
303 i = KEYP_PERIOD_US(20000, PTV_PRESCALER);
304 if (twl4030_kpwrite_u8(kp, i, KEYP_DEB) < 0)
305 return -EIO;
306
307
308 i = KEYP_PERIOD_US(200000, PTV_PRESCALER);
309 if (twl4030_kpwrite_u8(kp, (i & 0xFF), KEYP_TIMEOUT_L) < 0)
310 return -EIO;
311
312 if (twl4030_kpwrite_u8(kp, (i >> 8), KEYP_TIMEOUT_H) < 0)
313 return -EIO;
314
315
316
317
318
319 reg = TWL4030_SIH_CTRL_COR_MASK | TWL4030_SIH_CTRL_PENDDIS_MASK;
320 if (twl4030_kpwrite_u8(kp, reg, KEYP_SIH_CTRL) < 0)
321 return -EIO;
322
323
324 if (twl4030_read_kp_matrix_state(kp, kp->kp_state) < 0)
325 return -EIO;
326
327 return 0;
328}
329
330
331
332
333
334static int __devinit twl4030_kp_probe(struct platform_device *pdev)
335{
336 struct twl4030_keypad_data *pdata = pdev->dev.platform_data;
337 const struct matrix_keymap_data *keymap_data = pdata->keymap_data;
338 struct twl4030_keypad *kp;
339 struct input_dev *input;
340 u8 reg;
341 int error;
342
343 if (!pdata || !pdata->rows || !pdata->cols ||
344 pdata->rows > TWL4030_MAX_ROWS || pdata->cols > TWL4030_MAX_COLS) {
345 dev_err(&pdev->dev, "Invalid platform_data\n");
346 return -EINVAL;
347 }
348
349 kp = kzalloc(sizeof(*kp), GFP_KERNEL);
350 input = input_allocate_device();
351 if (!kp || !input) {
352 error = -ENOMEM;
353 goto err1;
354 }
355
356
357 kp->dbg_dev = &pdev->dev;
358 kp->input = input;
359
360 kp->n_rows = pdata->rows;
361 kp->n_cols = pdata->cols;
362 kp->irq = platform_get_irq(pdev, 0);
363
364
365 __set_bit(EV_KEY, input->evbit);
366
367
368 if (pdata->rep)
369 __set_bit(EV_REP, input->evbit);
370
371 input_set_capability(input, EV_MSC, MSC_SCAN);
372
373 input->name = "TWL4030 Keypad";
374 input->phys = "twl4030_keypad/input0";
375 input->dev.parent = &pdev->dev;
376
377 input->id.bustype = BUS_HOST;
378 input->id.vendor = 0x0001;
379 input->id.product = 0x0001;
380 input->id.version = 0x0003;
381
382 input->keycode = kp->keymap;
383 input->keycodesize = sizeof(kp->keymap[0]);
384 input->keycodemax = ARRAY_SIZE(kp->keymap);
385
386 matrix_keypad_build_keymap(keymap_data, TWL4030_ROW_SHIFT,
387 input->keycode, input->keybit);
388
389 error = input_register_device(input);
390 if (error) {
391 dev_err(kp->dbg_dev,
392 "Unable to register twl4030 keypad device\n");
393 goto err1;
394 }
395
396 error = twl4030_kp_program(kp);
397 if (error)
398 goto err2;
399
400
401
402
403
404
405
406 error = request_irq(kp->irq, do_kp_irq, 0, pdev->name, kp);
407 if (error) {
408 dev_info(kp->dbg_dev, "request_irq failed for irq no=%d\n",
409 kp->irq);
410 goto err3;
411 }
412
413
414 reg = (u8) ~(KEYP_IMR1_KP | KEYP_IMR1_TO);
415 if (twl4030_kpwrite_u8(kp, reg, KEYP_IMR1)) {
416 error = -EIO;
417 goto err4;
418 }
419
420 platform_set_drvdata(pdev, kp);
421 return 0;
422
423err4:
424
425 (void) twl4030_kpwrite_u8(kp, 0xff, KEYP_IMR1);
426err3:
427 free_irq(kp->irq, NULL);
428err2:
429 input_unregister_device(input);
430 input = NULL;
431err1:
432 input_free_device(input);
433 kfree(kp);
434 return error;
435}
436
437static int __devexit twl4030_kp_remove(struct platform_device *pdev)
438{
439 struct twl4030_keypad *kp = platform_get_drvdata(pdev);
440
441 free_irq(kp->irq, kp);
442 input_unregister_device(kp->input);
443 platform_set_drvdata(pdev, NULL);
444 kfree(kp);
445
446 return 0;
447}
448
449
450
451
452
453
454
455static struct platform_driver twl4030_kp_driver = {
456 .probe = twl4030_kp_probe,
457 .remove = __devexit_p(twl4030_kp_remove),
458 .driver = {
459 .name = "twl4030_keypad",
460 .owner = THIS_MODULE,
461 },
462};
463
464static int __init twl4030_kp_init(void)
465{
466 return platform_driver_register(&twl4030_kp_driver);
467}
468module_init(twl4030_kp_init);
469
470static void __exit twl4030_kp_exit(void)
471{
472 platform_driver_unregister(&twl4030_kp_driver);
473}
474module_exit(twl4030_kp_exit);
475
476MODULE_AUTHOR("Texas Instruments");
477MODULE_DESCRIPTION("TWL4030 Keypad Driver");
478MODULE_LICENSE("GPL");
479MODULE_ALIAS("platform:twl4030_keypad");
480
481