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1/*
2 * Copyright (C) ST-Ericsson SA 2010
3 *
4 * Author: Jayeeta Banerjee <jayeeta.banerjee@stericsson.com>
5 * Author: Sundar Iyer <sundar.iyer@stericsson.com>
6 *
7 * License Terms: GNU General Public License, version 2
8 *
9 * TC35893 MFD Keypad Controller driver
10 */
11
12#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/interrupt.h>
15#include <linux/input.h>
16#include <linux/platform_device.h>
17#include <linux/input/matrix_keypad.h>
18#include <linux/i2c.h>
19#include <linux/slab.h>
20#include <linux/mfd/tc3589x.h>
21
22/* Maximum supported keypad matrix row/columns size */
23#define TC3589x_MAX_KPROW 8
24#define TC3589x_MAX_KPCOL 12
25
26/* keypad related Constants */
27#define TC3589x_MAX_DEBOUNCE_SETTLE 0xFF
28#define DEDICATED_KEY_VAL 0xFF
29
30/* Pull up/down masks */
31#define TC3589x_NO_PULL_MASK 0x0
32#define TC3589x_PULL_DOWN_MASK 0x1
33#define TC3589x_PULL_UP_MASK 0x2
34#define TC3589x_PULLUP_ALL_MASK 0xAA
35#define TC3589x_IO_PULL_VAL(index, mask) ((mask)<<((index)%4)*2))
36
37/* Bit masks for IOCFG register */
38#define IOCFG_BALLCFG 0x01
39#define IOCFG_IG 0x08
40
41#define KP_EVCODE_COL_MASK 0x0F
42#define KP_EVCODE_ROW_MASK 0x70
43#define KP_RELEASE_EVT_MASK 0x80
44
45#define KP_ROW_SHIFT 4
46
47#define KP_NO_VALID_KEY_MASK 0x7F
48
49/* bit masks for RESTCTRL register */
50#define TC3589x_KBDRST 0x2
51#define TC3589x_IRQRST 0x10
52#define TC3589x_RESET_ALL 0x1B
53
54/* KBDMFS register bit mask */
55#define TC3589x_KBDMFS_EN 0x1
56
57/* CLKEN register bitmask */
58#define KPD_CLK_EN 0x1
59
60/* RSTINTCLR register bit mask */
61#define IRQ_CLEAR 0x1
62
63/* bit masks for keyboard interrupts*/
64#define TC3589x_EVT_LOSS_INT 0x8
65#define TC3589x_EVT_INT 0x4
66#define TC3589x_KBD_LOSS_INT 0x2
67#define TC3589x_KBD_INT 0x1
68
69/* bit masks for keyboard interrupt clear*/
70#define TC3589x_EVT_INT_CLR 0x2
71#define TC3589x_KBD_INT_CLR 0x1
72
73#define TC3589x_KBD_KEYMAP_SIZE 64
74
75/**
76 * struct tc_keypad - data structure used by keypad driver
77 * @input: pointer to input device object
78 * @board: keypad platform device
79 * @krow: number of rows
80 * @kcol: number of coloumns
81 * @keymap: matrix scan code table for keycodes
82 */
83struct tc_keypad {
84 struct tc3589x *tc3589x;
85 struct input_dev *input;
86 const struct tc3589x_keypad_platform_data *board;
87 unsigned int krow;
88 unsigned int kcol;
89 unsigned short keymap[TC3589x_KBD_KEYMAP_SIZE];
90 bool keypad_stopped;
91};
92
93static int __devinit tc3589x_keypad_init_key_hardware(struct tc_keypad *keypad)
94{
95 int ret;
96 struct tc3589x *tc3589x = keypad->tc3589x;
97 u8 settle_time = keypad->board->settle_time;
98 u8 dbounce_period = keypad->board->debounce_period;
99 u8 rows = keypad->board->krow & 0xf; /* mask out the nibble */
100 u8 column = keypad->board->kcol & 0xf; /* mask out the nibble */
101
102 /* validate platform configurations */
103 if (keypad->board->kcol > TC3589x_MAX_KPCOL ||
104 keypad->board->krow > TC3589x_MAX_KPROW ||
105 keypad->board->debounce_period > TC3589x_MAX_DEBOUNCE_SETTLE ||
106 keypad->board->settle_time > TC3589x_MAX_DEBOUNCE_SETTLE)
107 return -EINVAL;
108
109 /* configure KBDSIZE 4 LSbits for cols and 4 MSbits for rows */
110 ret = tc3589x_reg_write(tc3589x, TC3589x_KBDSIZE,
111 (rows << KP_ROW_SHIFT) | column);
112 if (ret < 0)
113 return ret;
114
115 /* configure dedicated key config, no dedicated key selected */
116 ret = tc3589x_reg_write(tc3589x, TC3589x_KBCFG_LSB, DEDICATED_KEY_VAL);
117 if (ret < 0)
118 return ret;
119
120 ret = tc3589x_reg_write(tc3589x, TC3589x_KBCFG_MSB, DEDICATED_KEY_VAL);
121 if (ret < 0)
122 return ret;
123
124 /* Configure settle time */
125 ret = tc3589x_reg_write(tc3589x, TC3589x_KBDSETTLE_REG, settle_time);
126 if (ret < 0)
127 return ret;
128
129 /* Configure debounce time */
130 ret = tc3589x_reg_write(tc3589x, TC3589x_KBDBOUNCE, dbounce_period);
131 if (ret < 0)
132 return ret;
133
134 /* Start of initialise keypad GPIOs */
135 ret = tc3589x_set_bits(tc3589x, TC3589x_IOCFG, 0x0, IOCFG_IG);
136 if (ret < 0)
137 return ret;
138
139 /* Configure pull-up resistors for all row GPIOs */
140 ret = tc3589x_reg_write(tc3589x, TC3589x_IOPULLCFG0_LSB,
141 TC3589x_PULLUP_ALL_MASK);
142 if (ret < 0)
143 return ret;
144
145 ret = tc3589x_reg_write(tc3589x, TC3589x_IOPULLCFG0_MSB,
146 TC3589x_PULLUP_ALL_MASK);
147 if (ret < 0)
148 return ret;
149
150 /* Configure pull-up resistors for all column GPIOs */
151 ret = tc3589x_reg_write(tc3589x, TC3589x_IOPULLCFG1_LSB,
152 TC3589x_PULLUP_ALL_MASK);
153 if (ret < 0)
154 return ret;
155
156 ret = tc3589x_reg_write(tc3589x, TC3589x_IOPULLCFG1_MSB,
157 TC3589x_PULLUP_ALL_MASK);
158 if (ret < 0)
159 return ret;
160
161 ret = tc3589x_reg_write(tc3589x, TC3589x_IOPULLCFG2_LSB,
162 TC3589x_PULLUP_ALL_MASK);
163
164 return ret;
165}
166
167#define TC35893_DATA_REGS 4
168#define TC35893_KEYCODE_FIFO_EMPTY 0x7f
169#define TC35893_KEYCODE_FIFO_CLEAR 0xff
170#define TC35893_KEYPAD_ROW_SHIFT 0x3
171
172static irqreturn_t tc3589x_keypad_irq(int irq, void *dev)
173{
174 struct tc_keypad *keypad = dev;
175 struct tc3589x *tc3589x = keypad->tc3589x;
176 u8 i, row_index, col_index, kbd_code, up;
177 u8 code;
178
179 for (i = 0; i < TC35893_DATA_REGS * 2; i++) {
180 kbd_code = tc3589x_reg_read(tc3589x, TC3589x_EVTCODE_FIFO);
181
182 /* loop till fifo is empty and no more keys are pressed */
183 if (kbd_code == TC35893_KEYCODE_FIFO_EMPTY ||
184 kbd_code == TC35893_KEYCODE_FIFO_CLEAR)
185 continue;
186
187 /* valid key is found */
188 col_index = kbd_code & KP_EVCODE_COL_MASK;
189 row_index = (kbd_code & KP_EVCODE_ROW_MASK) >> KP_ROW_SHIFT;
190 code = MATRIX_SCAN_CODE(row_index, col_index,
191 TC35893_KEYPAD_ROW_SHIFT);
192 up = kbd_code & KP_RELEASE_EVT_MASK;
193
194 input_event(keypad->input, EV_MSC, MSC_SCAN, code);
195 input_report_key(keypad->input, keypad->keymap[code], !up);
196 input_sync(keypad->input);
197 }
198
199 /* clear IRQ */
200 tc3589x_set_bits(tc3589x, TC3589x_KBDIC,
201 0x0, TC3589x_EVT_INT_CLR | TC3589x_KBD_INT_CLR);
202 /* enable IRQ */
203 tc3589x_set_bits(tc3589x, TC3589x_KBDMSK,
204 0x0, TC3589x_EVT_LOSS_INT | TC3589x_EVT_INT);
205
206 return IRQ_HANDLED;
207}
208
209static int tc3589x_keypad_enable(struct tc_keypad *keypad)
210{
211 struct tc3589x *tc3589x = keypad->tc3589x;
212 int ret;
213
214 /* pull the keypad module out of reset */
215 ret = tc3589x_set_bits(tc3589x, TC3589x_RSTCTRL, TC3589x_KBDRST, 0x0);
216 if (ret < 0)
217 return ret;
218
219 /* configure KBDMFS */
220 ret = tc3589x_set_bits(tc3589x, TC3589x_KBDMFS, 0x0, TC3589x_KBDMFS_EN);
221 if (ret < 0)
222 return ret;
223
224 /* enable the keypad clock */
225 ret = tc3589x_set_bits(tc3589x, TC3589x_CLKEN, 0x0, KPD_CLK_EN);
226 if (ret < 0)
227 return ret;
228
229 /* clear pending IRQs */
230 ret = tc3589x_set_bits(tc3589x, TC3589x_RSTINTCLR, 0x0, 0x1);
231 if (ret < 0)
232 return ret;
233
234 /* enable the IRQs */
235 ret = tc3589x_set_bits(tc3589x, TC3589x_KBDMSK, 0x0,
236 TC3589x_EVT_LOSS_INT | TC3589x_EVT_INT);
237 if (ret < 0)
238 return ret;
239
240 keypad->keypad_stopped = false;
241
242 return ret;
243}
244
245static int tc3589x_keypad_disable(struct tc_keypad *keypad)
246{
247 struct tc3589x *tc3589x = keypad->tc3589x;
248 int ret;
249
250 /* clear IRQ */
251 ret = tc3589x_set_bits(tc3589x, TC3589x_KBDIC,
252 0x0, TC3589x_EVT_INT_CLR | TC3589x_KBD_INT_CLR);
253 if (ret < 0)
254 return ret;
255
256 /* disable all interrupts */
257 ret = tc3589x_set_bits(tc3589x, TC3589x_KBDMSK,
258 ~(TC3589x_EVT_LOSS_INT | TC3589x_EVT_INT), 0x0);
259 if (ret < 0)
260 return ret;
261
262 /* disable the keypad module */
263 ret = tc3589x_set_bits(tc3589x, TC3589x_CLKEN, 0x1, 0x0);
264 if (ret < 0)
265 return ret;
266
267 /* put the keypad module into reset */
268 ret = tc3589x_set_bits(tc3589x, TC3589x_RSTCTRL, TC3589x_KBDRST, 0x1);
269
270 keypad->keypad_stopped = true;
271
272 return ret;
273}
274
275static int tc3589x_keypad_open(struct input_dev *input)
276{
277 int error;
278 struct tc_keypad *keypad = input_get_drvdata(input);
279
280 /* enable the keypad module */
281 error = tc3589x_keypad_enable(keypad);
282 if (error < 0) {
283 dev_err(&input->dev, "failed to enable keypad module\n");
284 return error;
285 }
286
287 error = tc3589x_keypad_init_key_hardware(keypad);
288 if (error < 0) {
289 dev_err(&input->dev, "failed to configure keypad module\n");
290 return error;
291 }
292
293 return 0;
294}
295
296static void tc3589x_keypad_close(struct input_dev *input)
297{
298 struct tc_keypad *keypad = input_get_drvdata(input);
299
300 /* disable the keypad module */
301 tc3589x_keypad_disable(keypad);
302}
303
304static int __devinit tc3589x_keypad_probe(struct platform_device *pdev)
305{
306 struct tc3589x *tc3589x = dev_get_drvdata(pdev->dev.parent);
307 struct tc_keypad *keypad;
308 struct input_dev *input;
309 const struct tc3589x_keypad_platform_data *plat;
310 int error, irq;
311
312 plat = tc3589x->pdata->keypad;
313 if (!plat) {
314 dev_err(&pdev->dev, "invalid keypad platform data\n");
315 return -EINVAL;
316 }
317
318 irq = platform_get_irq(pdev, 0);
319 if (irq < 0)
320 return irq;
321
322 keypad = kzalloc(sizeof(struct tc_keypad), GFP_KERNEL);
323 input = input_allocate_device();
324 if (!keypad || !input) {
325 dev_err(&pdev->dev, "failed to allocate keypad memory\n");
326 error = -ENOMEM;
327 goto err_free_mem;
328 }
329
330 keypad->board = plat;
331 keypad->input = input;
332 keypad->tc3589x = tc3589x;
333
334 input->id.bustype = BUS_I2C;
335 input->name = pdev->name;
336 input->dev.parent = &pdev->dev;
337
338 input->keycode = keypad->keymap;
339 input->keycodesize = sizeof(keypad->keymap[0]);
340 input->keycodemax = ARRAY_SIZE(keypad->keymap);
341
342 input->open = tc3589x_keypad_open;
343 input->close = tc3589x_keypad_close;
344
345 input_set_drvdata(input, keypad);
346
347 input_set_capability(input, EV_MSC, MSC_SCAN);
348
349 __set_bit(EV_KEY, input->evbit);
350 if (!plat->no_autorepeat)
351 __set_bit(EV_REP, input->evbit);
352
353 matrix_keypad_build_keymap(plat->keymap_data, 0x3,
354 input->keycode, input->keybit);
355
356 error = request_threaded_irq(irq, NULL,
357 tc3589x_keypad_irq, plat->irqtype,
358 "tc3589x-keypad", keypad);
359 if (error < 0) {
360 dev_err(&pdev->dev,
361 "Could not allocate irq %d,error %d\n",
362 irq, error);
363 goto err_free_mem;
364 }
365
366 error = input_register_device(input);
367 if (error) {
368 dev_err(&pdev->dev, "Could not register input device\n");
369 goto err_free_irq;
370 }
371
372 /* let platform decide if keypad is a wakeup source or not */
373 device_init_wakeup(&pdev->dev, plat->enable_wakeup);
374 device_set_wakeup_capable(&pdev->dev, plat->enable_wakeup);
375
376 platform_set_drvdata(pdev, keypad);
377
378 return 0;
379
380err_free_irq:
381 free_irq(irq, keypad);
382err_free_mem:
383 input_free_device(input);
384 kfree(keypad);
385 return error;
386}
387
388static int __devexit tc3589x_keypad_remove(struct platform_device *pdev)
389{
390 struct tc_keypad *keypad = platform_get_drvdata(pdev);
391 int irq = platform_get_irq(pdev, 0);
392
393 if (!keypad->keypad_stopped)
394 tc3589x_keypad_disable(keypad);
395
396 free_irq(irq, keypad);
397
398 input_unregister_device(keypad->input);
399
400 kfree(keypad);
401
402 return 0;
403}
404
405#ifdef CONFIG_PM_SLEEP
406static int tc3589x_keypad_suspend(struct device *dev)
407{
408 struct platform_device *pdev = to_platform_device(dev);
409 struct tc_keypad *keypad = platform_get_drvdata(pdev);
410 int irq = platform_get_irq(pdev, 0);
411
412 /* keypad is already off; we do nothing */
413 if (keypad->keypad_stopped)
414 return 0;
415
416 /* if device is not a wakeup source, disable it for powersave */
417 if (!device_may_wakeup(&pdev->dev))
418 tc3589x_keypad_disable(keypad);
419 else
420 enable_irq_wake(irq);
421
422 return 0;
423}
424
425static int tc3589x_keypad_resume(struct device *dev)
426{
427 struct platform_device *pdev = to_platform_device(dev);
428 struct tc_keypad *keypad = platform_get_drvdata(pdev);
429 int irq = platform_get_irq(pdev, 0);
430
431 if (!keypad->keypad_stopped)
432 return 0;
433
434 /* enable the device to resume normal operations */
435 if (!device_may_wakeup(&pdev->dev))
436 tc3589x_keypad_enable(keypad);
437 else
438 disable_irq_wake(irq);
439
440 return 0;
441}
442#endif
443
444static SIMPLE_DEV_PM_OPS(tc3589x_keypad_dev_pm_ops,
445 tc3589x_keypad_suspend, tc3589x_keypad_resume);
446
447static struct platform_driver tc3589x_keypad_driver = {
448 .driver = {
449 .name = "tc3589x-keypad",
450 .owner = THIS_MODULE,
451 .pm = &tc3589x_keypad_dev_pm_ops,
452 },
453 .probe = tc3589x_keypad_probe,
454 .remove = __devexit_p(tc3589x_keypad_remove),
455};
456
457static int __init tc3589x_keypad_init(void)
458{
459 return platform_driver_register(&tc3589x_keypad_driver);
460}
461module_init(tc3589x_keypad_init);
462
463static void __exit tc3589x_keypad_exit(void)
464{
465 return platform_driver_unregister(&tc3589x_keypad_driver);
466}
467module_exit(tc3589x_keypad_exit);
468
469MODULE_LICENSE("GPL v2");
470MODULE_AUTHOR("Jayeeta Banerjee/Sundar Iyer");
471MODULE_DESCRIPTION("TC35893 Keypad Driver");
472MODULE_ALIAS("platform:tc3589x-keypad");
1/*
2 * Copyright (C) ST-Ericsson SA 2010
3 *
4 * Author: Jayeeta Banerjee <jayeeta.banerjee@stericsson.com>
5 * Author: Sundar Iyer <sundar.iyer@stericsson.com>
6 *
7 * License Terms: GNU General Public License, version 2
8 *
9 * TC35893 MFD Keypad Controller driver
10 */
11
12#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/interrupt.h>
15#include <linux/input.h>
16#include <linux/platform_device.h>
17#include <linux/input/matrix_keypad.h>
18#include <linux/i2c.h>
19#include <linux/slab.h>
20#include <linux/mfd/tc3589x.h>
21
22/* Maximum supported keypad matrix row/columns size */
23#define TC3589x_MAX_KPROW 8
24#define TC3589x_MAX_KPCOL 12
25
26/* keypad related Constants */
27#define TC3589x_MAX_DEBOUNCE_SETTLE 0xFF
28#define DEDICATED_KEY_VAL 0xFF
29
30/* Pull up/down masks */
31#define TC3589x_NO_PULL_MASK 0x0
32#define TC3589x_PULL_DOWN_MASK 0x1
33#define TC3589x_PULL_UP_MASK 0x2
34#define TC3589x_PULLUP_ALL_MASK 0xAA
35#define TC3589x_IO_PULL_VAL(index, mask) ((mask)<<((index)%4)*2))
36
37/* Bit masks for IOCFG register */
38#define IOCFG_BALLCFG 0x01
39#define IOCFG_IG 0x08
40
41#define KP_EVCODE_COL_MASK 0x0F
42#define KP_EVCODE_ROW_MASK 0x70
43#define KP_RELEASE_EVT_MASK 0x80
44
45#define KP_ROW_SHIFT 4
46
47#define KP_NO_VALID_KEY_MASK 0x7F
48
49/* bit masks for RESTCTRL register */
50#define TC3589x_KBDRST 0x2
51#define TC3589x_IRQRST 0x10
52#define TC3589x_RESET_ALL 0x1B
53
54/* KBDMFS register bit mask */
55#define TC3589x_KBDMFS_EN 0x1
56
57/* CLKEN register bitmask */
58#define KPD_CLK_EN 0x1
59
60/* RSTINTCLR register bit mask */
61#define IRQ_CLEAR 0x1
62
63/* bit masks for keyboard interrupts*/
64#define TC3589x_EVT_LOSS_INT 0x8
65#define TC3589x_EVT_INT 0x4
66#define TC3589x_KBD_LOSS_INT 0x2
67#define TC3589x_KBD_INT 0x1
68
69/* bit masks for keyboard interrupt clear*/
70#define TC3589x_EVT_INT_CLR 0x2
71#define TC3589x_KBD_INT_CLR 0x1
72
73#define TC3589x_KBD_KEYMAP_SIZE 64
74
75/**
76 * struct tc_keypad - data structure used by keypad driver
77 * @tc3589x: pointer to tc35893
78 * @input: pointer to input device object
79 * @board: keypad platform device
80 * @krow: number of rows
81 * @kcol: number of columns
82 * @keymap: matrix scan code table for keycodes
83 * @keypad_stopped: holds keypad status
84 */
85struct tc_keypad {
86 struct tc3589x *tc3589x;
87 struct input_dev *input;
88 const struct tc3589x_keypad_platform_data *board;
89 unsigned int krow;
90 unsigned int kcol;
91 unsigned short keymap[TC3589x_KBD_KEYMAP_SIZE];
92 bool keypad_stopped;
93};
94
95static int tc3589x_keypad_init_key_hardware(struct tc_keypad *keypad)
96{
97 int ret;
98 struct tc3589x *tc3589x = keypad->tc3589x;
99 const struct tc3589x_keypad_platform_data *board = keypad->board;
100
101 /* validate platform configuration */
102 if (board->kcol > TC3589x_MAX_KPCOL || board->krow > TC3589x_MAX_KPROW)
103 return -EINVAL;
104
105 /* configure KBDSIZE 4 LSbits for cols and 4 MSbits for rows */
106 ret = tc3589x_reg_write(tc3589x, TC3589x_KBDSIZE,
107 (board->krow << KP_ROW_SHIFT) | board->kcol);
108 if (ret < 0)
109 return ret;
110
111 /* configure dedicated key config, no dedicated key selected */
112 ret = tc3589x_reg_write(tc3589x, TC3589x_KBCFG_LSB, DEDICATED_KEY_VAL);
113 if (ret < 0)
114 return ret;
115
116 ret = tc3589x_reg_write(tc3589x, TC3589x_KBCFG_MSB, DEDICATED_KEY_VAL);
117 if (ret < 0)
118 return ret;
119
120 /* Configure settle time */
121 ret = tc3589x_reg_write(tc3589x, TC3589x_KBDSETTLE_REG,
122 board->settle_time);
123 if (ret < 0)
124 return ret;
125
126 /* Configure debounce time */
127 ret = tc3589x_reg_write(tc3589x, TC3589x_KBDBOUNCE,
128 board->debounce_period);
129 if (ret < 0)
130 return ret;
131
132 /* Start of initialise keypad GPIOs */
133 ret = tc3589x_set_bits(tc3589x, TC3589x_IOCFG, 0x0, IOCFG_IG);
134 if (ret < 0)
135 return ret;
136
137 /* Configure pull-up resistors for all row GPIOs */
138 ret = tc3589x_reg_write(tc3589x, TC3589x_IOPULLCFG0_LSB,
139 TC3589x_PULLUP_ALL_MASK);
140 if (ret < 0)
141 return ret;
142
143 ret = tc3589x_reg_write(tc3589x, TC3589x_IOPULLCFG0_MSB,
144 TC3589x_PULLUP_ALL_MASK);
145 if (ret < 0)
146 return ret;
147
148 /* Configure pull-up resistors for all column GPIOs */
149 ret = tc3589x_reg_write(tc3589x, TC3589x_IOPULLCFG1_LSB,
150 TC3589x_PULLUP_ALL_MASK);
151 if (ret < 0)
152 return ret;
153
154 ret = tc3589x_reg_write(tc3589x, TC3589x_IOPULLCFG1_MSB,
155 TC3589x_PULLUP_ALL_MASK);
156 if (ret < 0)
157 return ret;
158
159 ret = tc3589x_reg_write(tc3589x, TC3589x_IOPULLCFG2_LSB,
160 TC3589x_PULLUP_ALL_MASK);
161
162 return ret;
163}
164
165#define TC35893_DATA_REGS 4
166#define TC35893_KEYCODE_FIFO_EMPTY 0x7f
167#define TC35893_KEYCODE_FIFO_CLEAR 0xff
168#define TC35893_KEYPAD_ROW_SHIFT 0x3
169
170static irqreturn_t tc3589x_keypad_irq(int irq, void *dev)
171{
172 struct tc_keypad *keypad = dev;
173 struct tc3589x *tc3589x = keypad->tc3589x;
174 u8 i, row_index, col_index, kbd_code, up;
175 u8 code;
176
177 for (i = 0; i < TC35893_DATA_REGS * 2; i++) {
178 kbd_code = tc3589x_reg_read(tc3589x, TC3589x_EVTCODE_FIFO);
179
180 /* loop till fifo is empty and no more keys are pressed */
181 if (kbd_code == TC35893_KEYCODE_FIFO_EMPTY ||
182 kbd_code == TC35893_KEYCODE_FIFO_CLEAR)
183 continue;
184
185 /* valid key is found */
186 col_index = kbd_code & KP_EVCODE_COL_MASK;
187 row_index = (kbd_code & KP_EVCODE_ROW_MASK) >> KP_ROW_SHIFT;
188 code = MATRIX_SCAN_CODE(row_index, col_index,
189 TC35893_KEYPAD_ROW_SHIFT);
190 up = kbd_code & KP_RELEASE_EVT_MASK;
191
192 input_event(keypad->input, EV_MSC, MSC_SCAN, code);
193 input_report_key(keypad->input, keypad->keymap[code], !up);
194 input_sync(keypad->input);
195 }
196
197 /* clear IRQ */
198 tc3589x_set_bits(tc3589x, TC3589x_KBDIC,
199 0x0, TC3589x_EVT_INT_CLR | TC3589x_KBD_INT_CLR);
200 /* enable IRQ */
201 tc3589x_set_bits(tc3589x, TC3589x_KBDMSK,
202 0x0, TC3589x_EVT_LOSS_INT | TC3589x_EVT_INT);
203
204 return IRQ_HANDLED;
205}
206
207static int tc3589x_keypad_enable(struct tc_keypad *keypad)
208{
209 struct tc3589x *tc3589x = keypad->tc3589x;
210 int ret;
211
212 /* pull the keypad module out of reset */
213 ret = tc3589x_set_bits(tc3589x, TC3589x_RSTCTRL, TC3589x_KBDRST, 0x0);
214 if (ret < 0)
215 return ret;
216
217 /* configure KBDMFS */
218 ret = tc3589x_set_bits(tc3589x, TC3589x_KBDMFS, 0x0, TC3589x_KBDMFS_EN);
219 if (ret < 0)
220 return ret;
221
222 /* enable the keypad clock */
223 ret = tc3589x_set_bits(tc3589x, TC3589x_CLKEN, 0x0, KPD_CLK_EN);
224 if (ret < 0)
225 return ret;
226
227 /* clear pending IRQs */
228 ret = tc3589x_set_bits(tc3589x, TC3589x_RSTINTCLR, 0x0, 0x1);
229 if (ret < 0)
230 return ret;
231
232 /* enable the IRQs */
233 ret = tc3589x_set_bits(tc3589x, TC3589x_KBDMSK, 0x0,
234 TC3589x_EVT_LOSS_INT | TC3589x_EVT_INT);
235 if (ret < 0)
236 return ret;
237
238 keypad->keypad_stopped = false;
239
240 return ret;
241}
242
243static int tc3589x_keypad_disable(struct tc_keypad *keypad)
244{
245 struct tc3589x *tc3589x = keypad->tc3589x;
246 int ret;
247
248 /* clear IRQ */
249 ret = tc3589x_set_bits(tc3589x, TC3589x_KBDIC,
250 0x0, TC3589x_EVT_INT_CLR | TC3589x_KBD_INT_CLR);
251 if (ret < 0)
252 return ret;
253
254 /* disable all interrupts */
255 ret = tc3589x_set_bits(tc3589x, TC3589x_KBDMSK,
256 ~(TC3589x_EVT_LOSS_INT | TC3589x_EVT_INT), 0x0);
257 if (ret < 0)
258 return ret;
259
260 /* disable the keypad module */
261 ret = tc3589x_set_bits(tc3589x, TC3589x_CLKEN, 0x1, 0x0);
262 if (ret < 0)
263 return ret;
264
265 /* put the keypad module into reset */
266 ret = tc3589x_set_bits(tc3589x, TC3589x_RSTCTRL, TC3589x_KBDRST, 0x1);
267
268 keypad->keypad_stopped = true;
269
270 return ret;
271}
272
273static int tc3589x_keypad_open(struct input_dev *input)
274{
275 int error;
276 struct tc_keypad *keypad = input_get_drvdata(input);
277
278 /* enable the keypad module */
279 error = tc3589x_keypad_enable(keypad);
280 if (error < 0) {
281 dev_err(&input->dev, "failed to enable keypad module\n");
282 return error;
283 }
284
285 error = tc3589x_keypad_init_key_hardware(keypad);
286 if (error < 0) {
287 dev_err(&input->dev, "failed to configure keypad module\n");
288 return error;
289 }
290
291 return 0;
292}
293
294static void tc3589x_keypad_close(struct input_dev *input)
295{
296 struct tc_keypad *keypad = input_get_drvdata(input);
297
298 /* disable the keypad module */
299 tc3589x_keypad_disable(keypad);
300}
301
302static int __devinit tc3589x_keypad_probe(struct platform_device *pdev)
303{
304 struct tc3589x *tc3589x = dev_get_drvdata(pdev->dev.parent);
305 struct tc_keypad *keypad;
306 struct input_dev *input;
307 const struct tc3589x_keypad_platform_data *plat;
308 int error, irq;
309
310 plat = tc3589x->pdata->keypad;
311 if (!plat) {
312 dev_err(&pdev->dev, "invalid keypad platform data\n");
313 return -EINVAL;
314 }
315
316 irq = platform_get_irq(pdev, 0);
317 if (irq < 0)
318 return irq;
319
320 keypad = kzalloc(sizeof(struct tc_keypad), GFP_KERNEL);
321 input = input_allocate_device();
322 if (!keypad || !input) {
323 dev_err(&pdev->dev, "failed to allocate keypad memory\n");
324 error = -ENOMEM;
325 goto err_free_mem;
326 }
327
328 keypad->board = plat;
329 keypad->input = input;
330 keypad->tc3589x = tc3589x;
331
332 input->id.bustype = BUS_I2C;
333 input->name = pdev->name;
334 input->dev.parent = &pdev->dev;
335
336 input->open = tc3589x_keypad_open;
337 input->close = tc3589x_keypad_close;
338
339 error = matrix_keypad_build_keymap(plat->keymap_data, NULL,
340 TC3589x_MAX_KPROW, TC3589x_MAX_KPCOL,
341 keypad->keymap, input);
342 if (error) {
343 dev_err(&pdev->dev, "Failed to build keymap\n");
344 goto err_free_mem;
345 }
346
347 input_set_capability(input, EV_MSC, MSC_SCAN);
348 if (!plat->no_autorepeat)
349 __set_bit(EV_REP, input->evbit);
350
351 input_set_drvdata(input, keypad);
352
353 error = request_threaded_irq(irq, NULL,
354 tc3589x_keypad_irq, plat->irqtype,
355 "tc3589x-keypad", keypad);
356 if (error < 0) {
357 dev_err(&pdev->dev,
358 "Could not allocate irq %d,error %d\n",
359 irq, error);
360 goto err_free_mem;
361 }
362
363 error = input_register_device(input);
364 if (error) {
365 dev_err(&pdev->dev, "Could not register input device\n");
366 goto err_free_irq;
367 }
368
369 /* let platform decide if keypad is a wakeup source or not */
370 device_init_wakeup(&pdev->dev, plat->enable_wakeup);
371 device_set_wakeup_capable(&pdev->dev, plat->enable_wakeup);
372
373 platform_set_drvdata(pdev, keypad);
374
375 return 0;
376
377err_free_irq:
378 free_irq(irq, keypad);
379err_free_mem:
380 input_free_device(input);
381 kfree(keypad);
382 return error;
383}
384
385static int __devexit tc3589x_keypad_remove(struct platform_device *pdev)
386{
387 struct tc_keypad *keypad = platform_get_drvdata(pdev);
388 int irq = platform_get_irq(pdev, 0);
389
390 if (!keypad->keypad_stopped)
391 tc3589x_keypad_disable(keypad);
392
393 free_irq(irq, keypad);
394
395 input_unregister_device(keypad->input);
396
397 kfree(keypad);
398
399 return 0;
400}
401
402#ifdef CONFIG_PM_SLEEP
403static int tc3589x_keypad_suspend(struct device *dev)
404{
405 struct platform_device *pdev = to_platform_device(dev);
406 struct tc_keypad *keypad = platform_get_drvdata(pdev);
407 int irq = platform_get_irq(pdev, 0);
408
409 /* keypad is already off; we do nothing */
410 if (keypad->keypad_stopped)
411 return 0;
412
413 /* if device is not a wakeup source, disable it for powersave */
414 if (!device_may_wakeup(&pdev->dev))
415 tc3589x_keypad_disable(keypad);
416 else
417 enable_irq_wake(irq);
418
419 return 0;
420}
421
422static int tc3589x_keypad_resume(struct device *dev)
423{
424 struct platform_device *pdev = to_platform_device(dev);
425 struct tc_keypad *keypad = platform_get_drvdata(pdev);
426 int irq = platform_get_irq(pdev, 0);
427
428 if (!keypad->keypad_stopped)
429 return 0;
430
431 /* enable the device to resume normal operations */
432 if (!device_may_wakeup(&pdev->dev))
433 tc3589x_keypad_enable(keypad);
434 else
435 disable_irq_wake(irq);
436
437 return 0;
438}
439#endif
440
441static SIMPLE_DEV_PM_OPS(tc3589x_keypad_dev_pm_ops,
442 tc3589x_keypad_suspend, tc3589x_keypad_resume);
443
444static struct platform_driver tc3589x_keypad_driver = {
445 .driver = {
446 .name = "tc3589x-keypad",
447 .owner = THIS_MODULE,
448 .pm = &tc3589x_keypad_dev_pm_ops,
449 },
450 .probe = tc3589x_keypad_probe,
451 .remove = __devexit_p(tc3589x_keypad_remove),
452};
453module_platform_driver(tc3589x_keypad_driver);
454
455MODULE_LICENSE("GPL v2");
456MODULE_AUTHOR("Jayeeta Banerjee/Sundar Iyer");
457MODULE_DESCRIPTION("TC35893 Keypad Driver");
458MODULE_ALIAS("platform:tc3589x-keypad");