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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * OMAP4 Keypad Driver
4 *
5 * Copyright (C) 2010 Texas Instruments
6 *
7 * Author: Abraham Arce <x0066660@ti.com>
8 * Initial Code: Syed Rafiuddin <rafiuddin.syed@ti.com>
9 */
10
11#include <linux/module.h>
12#include <linux/interrupt.h>
13#include <linux/platform_device.h>
14#include <linux/errno.h>
15#include <linux/io.h>
16#include <linux/of.h>
17#include <linux/input.h>
18#include <linux/input/matrix_keypad.h>
19#include <linux/slab.h>
20#include <linux/pm_runtime.h>
21#include <linux/pm_wakeirq.h>
22
23/* OMAP4 registers */
24#define OMAP4_KBD_REVISION 0x00
25#define OMAP4_KBD_SYSCONFIG 0x10
26#define OMAP4_KBD_SYSSTATUS 0x14
27#define OMAP4_KBD_IRQSTATUS 0x18
28#define OMAP4_KBD_IRQENABLE 0x1C
29#define OMAP4_KBD_WAKEUPENABLE 0x20
30#define OMAP4_KBD_PENDING 0x24
31#define OMAP4_KBD_CTRL 0x28
32#define OMAP4_KBD_DEBOUNCINGTIME 0x2C
33#define OMAP4_KBD_LONGKEYTIME 0x30
34#define OMAP4_KBD_TIMEOUT 0x34
35#define OMAP4_KBD_STATEMACHINE 0x38
36#define OMAP4_KBD_ROWINPUTS 0x3C
37#define OMAP4_KBD_COLUMNOUTPUTS 0x40
38#define OMAP4_KBD_FULLCODE31_0 0x44
39#define OMAP4_KBD_FULLCODE63_32 0x48
40
41/* OMAP4 bit definitions */
42#define OMAP4_DEF_IRQENABLE_EVENTEN BIT(0)
43#define OMAP4_DEF_IRQENABLE_LONGKEY BIT(1)
44#define OMAP4_DEF_WUP_EVENT_ENA BIT(0)
45#define OMAP4_DEF_WUP_LONG_KEY_ENA BIT(1)
46#define OMAP4_DEF_CTRL_NOSOFTMODE BIT(1)
47#define OMAP4_DEF_CTRL_PTV_SHIFT 2
48
49/* OMAP4 values */
50#define OMAP4_VAL_IRQDISABLE 0x0
51
52/*
53 * Errata i689: If a key is released for a time shorter than debounce time,
54 * the keyboard will idle and never detect the key release. The workaround
55 * is to use at least a 12ms debounce time. See omap5432 TRM chapter
56 * "26.4.6.2 Keyboard Controller Timer" for more information.
57 */
58#define OMAP4_KEYPAD_PTV_DIV_128 0x6
59#define OMAP4_KEYPAD_DEBOUNCINGTIME_MS(dbms, ptv) \
60 ((((dbms) * 1000) / ((1 << ((ptv) + 1)) * (1000000 / 32768))) - 1)
61#define OMAP4_VAL_DEBOUNCINGTIME_16MS \
62 OMAP4_KEYPAD_DEBOUNCINGTIME_MS(16, OMAP4_KEYPAD_PTV_DIV_128)
63#define OMAP4_KEYPAD_AUTOIDLE_MS 50 /* Approximate measured time */
64#define OMAP4_KEYPAD_IDLE_CHECK_MS (OMAP4_KEYPAD_AUTOIDLE_MS / 2)
65
66enum {
67 KBD_REVISION_OMAP4 = 0,
68 KBD_REVISION_OMAP5,
69};
70
71struct omap4_keypad {
72 struct input_dev *input;
73
74 void __iomem *base;
75 unsigned int irq;
76 struct mutex lock; /* for key scan */
77
78 unsigned int rows;
79 unsigned int cols;
80 u32 reg_offset;
81 u32 irqreg_offset;
82 unsigned int row_shift;
83 bool no_autorepeat;
84 u64 keys;
85 unsigned short *keymap;
86};
87
88static int kbd_readl(struct omap4_keypad *keypad_data, u32 offset)
89{
90 return __raw_readl(keypad_data->base +
91 keypad_data->reg_offset + offset);
92}
93
94static void kbd_writel(struct omap4_keypad *keypad_data, u32 offset, u32 value)
95{
96 __raw_writel(value,
97 keypad_data->base + keypad_data->reg_offset + offset);
98}
99
100static int kbd_read_irqreg(struct omap4_keypad *keypad_data, u32 offset)
101{
102 return __raw_readl(keypad_data->base +
103 keypad_data->irqreg_offset + offset);
104}
105
106static void kbd_write_irqreg(struct omap4_keypad *keypad_data,
107 u32 offset, u32 value)
108{
109 __raw_writel(value,
110 keypad_data->base + keypad_data->irqreg_offset + offset);
111}
112
113static int omap4_keypad_report_keys(struct omap4_keypad *keypad_data,
114 u64 keys, bool down)
115{
116 struct input_dev *input_dev = keypad_data->input;
117 unsigned int col, row, code;
118 DECLARE_BITMAP(mask, 64);
119 unsigned long bit;
120 int events = 0;
121
122 bitmap_from_u64(mask, keys);
123
124 for_each_set_bit(bit, mask, keypad_data->rows * BITS_PER_BYTE) {
125 row = bit / BITS_PER_BYTE;
126 col = bit % BITS_PER_BYTE;
127 code = MATRIX_SCAN_CODE(row, col, keypad_data->row_shift);
128
129 input_event(input_dev, EV_MSC, MSC_SCAN, code);
130 input_report_key(input_dev, keypad_data->keymap[code], down);
131
132 events++;
133 }
134
135 if (events)
136 input_sync(input_dev);
137
138 return events;
139}
140
141static void omap4_keypad_scan_keys(struct omap4_keypad *keypad_data, u64 keys)
142{
143 u64 changed;
144
145 mutex_lock(&keypad_data->lock);
146
147 changed = keys ^ keypad_data->keys;
148
149 /*
150 * Report key up events separately and first. This matters in case we
151 * lost key-up interrupt and just now catching up.
152 */
153 omap4_keypad_report_keys(keypad_data, changed & ~keys, false);
154
155 /* Report key down events */
156 omap4_keypad_report_keys(keypad_data, changed & keys, true);
157
158 keypad_data->keys = keys;
159
160 mutex_unlock(&keypad_data->lock);
161}
162
163/* Interrupt handlers */
164static irqreturn_t omap4_keypad_irq_handler(int irq, void *dev_id)
165{
166 struct omap4_keypad *keypad_data = dev_id;
167
168 if (kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS))
169 return IRQ_WAKE_THREAD;
170
171 return IRQ_NONE;
172}
173
174static irqreturn_t omap4_keypad_irq_thread_fn(int irq, void *dev_id)
175{
176 struct omap4_keypad *keypad_data = dev_id;
177 struct device *dev = keypad_data->input->dev.parent;
178 u32 low, high;
179 int error;
180 u64 keys;
181
182 error = pm_runtime_resume_and_get(dev);
183 if (error)
184 return IRQ_NONE;
185
186 low = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE31_0);
187 high = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE63_32);
188 keys = low | (u64)high << 32;
189
190 omap4_keypad_scan_keys(keypad_data, keys);
191
192 /* clear pending interrupts */
193 kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
194 kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
195
196 pm_runtime_mark_last_busy(dev);
197 pm_runtime_put_autosuspend(dev);
198
199 return IRQ_HANDLED;
200}
201
202static int omap4_keypad_open(struct input_dev *input)
203{
204 struct omap4_keypad *keypad_data = input_get_drvdata(input);
205 struct device *dev = input->dev.parent;
206 int error;
207
208 error = pm_runtime_resume_and_get(dev);
209 if (error)
210 return error;
211
212 disable_irq(keypad_data->irq);
213
214 kbd_writel(keypad_data, OMAP4_KBD_CTRL,
215 OMAP4_DEF_CTRL_NOSOFTMODE |
216 (OMAP4_KEYPAD_PTV_DIV_128 << OMAP4_DEF_CTRL_PTV_SHIFT));
217 kbd_writel(keypad_data, OMAP4_KBD_DEBOUNCINGTIME,
218 OMAP4_VAL_DEBOUNCINGTIME_16MS);
219 /* clear pending interrupts */
220 kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
221 kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
222 kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
223 OMAP4_DEF_IRQENABLE_EVENTEN);
224 kbd_writel(keypad_data, OMAP4_KBD_WAKEUPENABLE,
225 OMAP4_DEF_WUP_EVENT_ENA);
226
227 enable_irq(keypad_data->irq);
228
229 pm_runtime_mark_last_busy(dev);
230 pm_runtime_put_autosuspend(dev);
231
232 return 0;
233}
234
235static void omap4_keypad_stop(struct omap4_keypad *keypad_data)
236{
237 /* Disable interrupts and wake-up events */
238 kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
239 OMAP4_VAL_IRQDISABLE);
240 kbd_writel(keypad_data, OMAP4_KBD_WAKEUPENABLE, 0);
241
242 /* clear pending interrupts */
243 kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
244 kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
245}
246
247static void omap4_keypad_close(struct input_dev *input)
248{
249 struct omap4_keypad *keypad_data = input_get_drvdata(input);
250 struct device *dev = input->dev.parent;
251 int error;
252
253 error = pm_runtime_resume_and_get(dev);
254 if (error)
255 dev_err(dev, "%s: pm_runtime_resume_and_get() failed: %d\n",
256 __func__, error);
257
258 disable_irq(keypad_data->irq);
259 omap4_keypad_stop(keypad_data);
260 enable_irq(keypad_data->irq);
261
262 pm_runtime_mark_last_busy(dev);
263 pm_runtime_put_autosuspend(dev);
264}
265
266static int omap4_keypad_parse_dt(struct device *dev,
267 struct omap4_keypad *keypad_data)
268{
269 struct device_node *np = dev->of_node;
270 int err;
271
272 err = matrix_keypad_parse_properties(dev, &keypad_data->rows,
273 &keypad_data->cols);
274 if (err)
275 return err;
276
277 if (of_get_property(np, "linux,input-no-autorepeat", NULL))
278 keypad_data->no_autorepeat = true;
279
280 return 0;
281}
282
283static int omap4_keypad_check_revision(struct device *dev,
284 struct omap4_keypad *keypad_data)
285{
286 unsigned int rev;
287
288 rev = __raw_readl(keypad_data->base + OMAP4_KBD_REVISION);
289 rev &= 0x03 << 30;
290 rev >>= 30;
291 switch (rev) {
292 case KBD_REVISION_OMAP4:
293 keypad_data->reg_offset = 0x00;
294 keypad_data->irqreg_offset = 0x00;
295 break;
296 case KBD_REVISION_OMAP5:
297 keypad_data->reg_offset = 0x10;
298 keypad_data->irqreg_offset = 0x0c;
299 break;
300 default:
301 dev_err(dev, "Keypad reports unsupported revision %d", rev);
302 return -EINVAL;
303 }
304
305 return 0;
306}
307
308/*
309 * Errata ID i689 "1.32 Keyboard Key Up Event Can Be Missed".
310 * Interrupt may not happen for key-up events. We must clear stuck
311 * key-up events after the keyboard hardware has auto-idled.
312 */
313static int __maybe_unused omap4_keypad_runtime_suspend(struct device *dev)
314{
315 struct platform_device *pdev = to_platform_device(dev);
316 struct omap4_keypad *keypad_data = platform_get_drvdata(pdev);
317 u32 active;
318
319 active = kbd_readl(keypad_data, OMAP4_KBD_STATEMACHINE);
320 if (active) {
321 pm_runtime_mark_last_busy(dev);
322 return -EBUSY;
323 }
324
325 omap4_keypad_scan_keys(keypad_data, 0);
326
327 return 0;
328}
329
330static const struct dev_pm_ops omap4_keypad_pm_ops = {
331 SET_RUNTIME_PM_OPS(omap4_keypad_runtime_suspend, NULL, NULL)
332};
333
334static void omap4_disable_pm(void *d)
335{
336 pm_runtime_dont_use_autosuspend(d);
337 pm_runtime_disable(d);
338}
339
340static int omap4_keypad_probe(struct platform_device *pdev)
341{
342 struct device *dev = &pdev->dev;
343 struct omap4_keypad *keypad_data;
344 struct input_dev *input_dev;
345 struct resource *res;
346 unsigned int max_keys;
347 int irq;
348 int error;
349
350 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
351 if (!res) {
352 dev_err(&pdev->dev, "no base address specified\n");
353 return -EINVAL;
354 }
355
356 irq = platform_get_irq(pdev, 0);
357 if (irq < 0)
358 return irq;
359
360 keypad_data = devm_kzalloc(dev, sizeof(*keypad_data), GFP_KERNEL);
361 if (!keypad_data) {
362 dev_err(dev, "keypad_data memory allocation failed\n");
363 return -ENOMEM;
364 }
365
366 keypad_data->irq = irq;
367 mutex_init(&keypad_data->lock);
368 platform_set_drvdata(pdev, keypad_data);
369
370 error = omap4_keypad_parse_dt(dev, keypad_data);
371 if (error)
372 return error;
373
374 keypad_data->base = devm_ioremap_resource(dev, res);
375 if (IS_ERR(keypad_data->base))
376 return PTR_ERR(keypad_data->base);
377
378 pm_runtime_use_autosuspend(dev);
379 pm_runtime_set_autosuspend_delay(dev, OMAP4_KEYPAD_IDLE_CHECK_MS);
380 pm_runtime_enable(dev);
381
382 error = devm_add_action_or_reset(dev, omap4_disable_pm, dev);
383 if (error) {
384 dev_err(dev, "unable to register cleanup action\n");
385 return error;
386 }
387
388 /*
389 * Enable clocks for the keypad module so that we can read
390 * revision register.
391 */
392 error = pm_runtime_resume_and_get(dev);
393 if (error) {
394 dev_err(dev, "pm_runtime_resume_and_get() failed\n");
395 return error;
396 }
397
398 error = omap4_keypad_check_revision(dev, keypad_data);
399 if (!error) {
400 /* Ensure device does not raise interrupts */
401 omap4_keypad_stop(keypad_data);
402 }
403
404 pm_runtime_mark_last_busy(dev);
405 pm_runtime_put_autosuspend(dev);
406 if (error)
407 return error;
408
409 /* input device allocation */
410 keypad_data->input = input_dev = devm_input_allocate_device(dev);
411 if (!input_dev)
412 return -ENOMEM;
413
414 input_dev->name = pdev->name;
415 input_dev->id.bustype = BUS_HOST;
416 input_dev->id.vendor = 0x0001;
417 input_dev->id.product = 0x0001;
418 input_dev->id.version = 0x0001;
419
420 input_dev->open = omap4_keypad_open;
421 input_dev->close = omap4_keypad_close;
422
423 input_set_capability(input_dev, EV_MSC, MSC_SCAN);
424 if (!keypad_data->no_autorepeat)
425 __set_bit(EV_REP, input_dev->evbit);
426
427 input_set_drvdata(input_dev, keypad_data);
428
429 keypad_data->row_shift = get_count_order(keypad_data->cols);
430 max_keys = keypad_data->rows << keypad_data->row_shift;
431 keypad_data->keymap = devm_kcalloc(dev,
432 max_keys,
433 sizeof(keypad_data->keymap[0]),
434 GFP_KERNEL);
435 if (!keypad_data->keymap) {
436 dev_err(dev, "Not enough memory for keymap\n");
437 return -ENOMEM;
438 }
439
440 error = matrix_keypad_build_keymap(NULL, NULL,
441 keypad_data->rows, keypad_data->cols,
442 keypad_data->keymap, input_dev);
443 if (error) {
444 dev_err(dev, "failed to build keymap\n");
445 return error;
446 }
447
448 error = devm_request_threaded_irq(dev, keypad_data->irq,
449 omap4_keypad_irq_handler,
450 omap4_keypad_irq_thread_fn,
451 IRQF_ONESHOT,
452 "omap4-keypad", keypad_data);
453 if (error) {
454 dev_err(dev, "failed to register interrupt\n");
455 return error;
456 }
457
458 error = input_register_device(keypad_data->input);
459 if (error) {
460 dev_err(dev, "failed to register input device\n");
461 return error;
462 }
463
464 device_init_wakeup(dev, true);
465 error = dev_pm_set_wake_irq(dev, keypad_data->irq);
466 if (error)
467 dev_warn(dev, "failed to set up wakeup irq: %d\n", error);
468
469 return 0;
470}
471
472static int omap4_keypad_remove(struct platform_device *pdev)
473{
474 dev_pm_clear_wake_irq(&pdev->dev);
475
476 return 0;
477}
478
479static const struct of_device_id omap_keypad_dt_match[] = {
480 { .compatible = "ti,omap4-keypad" },
481 {},
482};
483MODULE_DEVICE_TABLE(of, omap_keypad_dt_match);
484
485static struct platform_driver omap4_keypad_driver = {
486 .probe = omap4_keypad_probe,
487 .remove = omap4_keypad_remove,
488 .driver = {
489 .name = "omap4-keypad",
490 .of_match_table = omap_keypad_dt_match,
491 .pm = &omap4_keypad_pm_ops,
492 },
493};
494module_platform_driver(omap4_keypad_driver);
495
496MODULE_AUTHOR("Texas Instruments");
497MODULE_DESCRIPTION("OMAP4 Keypad Driver");
498MODULE_LICENSE("GPL");
499MODULE_ALIAS("platform:omap4-keypad");
1/*
2 * OMAP4 Keypad Driver
3 *
4 * Copyright (C) 2010 Texas Instruments
5 *
6 * Author: Abraham Arce <x0066660@ti.com>
7 * Initial Code: Syed Rafiuddin <rafiuddin.syed@ti.com>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23
24#include <linux/module.h>
25#include <linux/init.h>
26#include <linux/interrupt.h>
27#include <linux/platform_device.h>
28#include <linux/errno.h>
29#include <linux/io.h>
30#include <linux/input.h>
31#include <linux/slab.h>
32#include <linux/pm_runtime.h>
33
34#include <linux/platform_data/omap4-keypad.h>
35
36/* OMAP4 registers */
37#define OMAP4_KBD_REVISION 0x00
38#define OMAP4_KBD_SYSCONFIG 0x10
39#define OMAP4_KBD_SYSSTATUS 0x14
40#define OMAP4_KBD_IRQSTATUS 0x18
41#define OMAP4_KBD_IRQENABLE 0x1C
42#define OMAP4_KBD_WAKEUPENABLE 0x20
43#define OMAP4_KBD_PENDING 0x24
44#define OMAP4_KBD_CTRL 0x28
45#define OMAP4_KBD_DEBOUNCINGTIME 0x2C
46#define OMAP4_KBD_LONGKEYTIME 0x30
47#define OMAP4_KBD_TIMEOUT 0x34
48#define OMAP4_KBD_STATEMACHINE 0x38
49#define OMAP4_KBD_ROWINPUTS 0x3C
50#define OMAP4_KBD_COLUMNOUTPUTS 0x40
51#define OMAP4_KBD_FULLCODE31_0 0x44
52#define OMAP4_KBD_FULLCODE63_32 0x48
53
54/* OMAP4 bit definitions */
55#define OMAP4_DEF_IRQENABLE_EVENTEN (1 << 0)
56#define OMAP4_DEF_IRQENABLE_LONGKEY (1 << 1)
57#define OMAP4_DEF_IRQENABLE_TIMEOUTEN (1 << 2)
58#define OMAP4_DEF_WUP_EVENT_ENA (1 << 0)
59#define OMAP4_DEF_WUP_LONG_KEY_ENA (1 << 1)
60#define OMAP4_DEF_CTRL_NOSOFTMODE (1 << 1)
61#define OMAP4_DEF_CTRLPTVVALUE (1 << 2)
62#define OMAP4_DEF_CTRLPTV (1 << 1)
63
64/* OMAP4 values */
65#define OMAP4_VAL_IRQDISABLE 0x00
66#define OMAP4_VAL_DEBOUNCINGTIME 0x07
67#define OMAP4_VAL_FUNCTIONALCFG 0x1E
68
69#define OMAP4_MASK_IRQSTATUSDISABLE 0xFFFF
70
71enum {
72 KBD_REVISION_OMAP4 = 0,
73 KBD_REVISION_OMAP5,
74};
75
76struct omap4_keypad {
77 struct input_dev *input;
78
79 void __iomem *base;
80 unsigned int irq;
81
82 unsigned int rows;
83 unsigned int cols;
84 u32 reg_offset;
85 u32 irqreg_offset;
86 unsigned int row_shift;
87 unsigned char key_state[8];
88 unsigned short keymap[];
89};
90
91static int kbd_readl(struct omap4_keypad *keypad_data, u32 offset)
92{
93 return __raw_readl(keypad_data->base +
94 keypad_data->reg_offset + offset);
95}
96
97static void kbd_writel(struct omap4_keypad *keypad_data, u32 offset, u32 value)
98{
99 __raw_writel(value,
100 keypad_data->base + keypad_data->reg_offset + offset);
101}
102
103static int kbd_read_irqreg(struct omap4_keypad *keypad_data, u32 offset)
104{
105 return __raw_readl(keypad_data->base +
106 keypad_data->irqreg_offset + offset);
107}
108
109static void kbd_write_irqreg(struct omap4_keypad *keypad_data,
110 u32 offset, u32 value)
111{
112 __raw_writel(value,
113 keypad_data->base + keypad_data->irqreg_offset + offset);
114}
115
116
117/* Interrupt handler */
118static irqreturn_t omap4_keypad_interrupt(int irq, void *dev_id)
119{
120 struct omap4_keypad *keypad_data = dev_id;
121 struct input_dev *input_dev = keypad_data->input;
122 unsigned char key_state[ARRAY_SIZE(keypad_data->key_state)];
123 unsigned int col, row, code, changed;
124 u32 *new_state = (u32 *) key_state;
125
126 /* Disable interrupts */
127 kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
128 OMAP4_VAL_IRQDISABLE);
129
130 *new_state = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE31_0);
131 *(new_state + 1) = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE63_32);
132
133 for (row = 0; row < keypad_data->rows; row++) {
134 changed = key_state[row] ^ keypad_data->key_state[row];
135 if (!changed)
136 continue;
137
138 for (col = 0; col < keypad_data->cols; col++) {
139 if (changed & (1 << col)) {
140 code = MATRIX_SCAN_CODE(row, col,
141 keypad_data->row_shift);
142 input_event(input_dev, EV_MSC, MSC_SCAN, code);
143 input_report_key(input_dev,
144 keypad_data->keymap[code],
145 key_state[row] & (1 << col));
146 }
147 }
148 }
149
150 input_sync(input_dev);
151
152 memcpy(keypad_data->key_state, key_state,
153 sizeof(keypad_data->key_state));
154
155 /* clear pending interrupts */
156 kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
157 kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
158
159 /* enable interrupts */
160 kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
161 OMAP4_DEF_IRQENABLE_EVENTEN |
162 OMAP4_DEF_IRQENABLE_LONGKEY);
163
164 return IRQ_HANDLED;
165}
166
167static int omap4_keypad_open(struct input_dev *input)
168{
169 struct omap4_keypad *keypad_data = input_get_drvdata(input);
170
171 pm_runtime_get_sync(input->dev.parent);
172
173 disable_irq(keypad_data->irq);
174
175 kbd_writel(keypad_data, OMAP4_KBD_CTRL,
176 OMAP4_VAL_FUNCTIONALCFG);
177 kbd_writel(keypad_data, OMAP4_KBD_DEBOUNCINGTIME,
178 OMAP4_VAL_DEBOUNCINGTIME);
179 kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
180 OMAP4_VAL_IRQDISABLE);
181 kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
182 OMAP4_DEF_IRQENABLE_EVENTEN |
183 OMAP4_DEF_IRQENABLE_LONGKEY);
184 kbd_writel(keypad_data, OMAP4_KBD_WAKEUPENABLE,
185 OMAP4_DEF_WUP_EVENT_ENA | OMAP4_DEF_WUP_LONG_KEY_ENA);
186
187 enable_irq(keypad_data->irq);
188
189 return 0;
190}
191
192static void omap4_keypad_close(struct input_dev *input)
193{
194 struct omap4_keypad *keypad_data = input_get_drvdata(input);
195
196 disable_irq(keypad_data->irq);
197
198 /* Disable interrupts */
199 kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
200 OMAP4_VAL_IRQDISABLE);
201
202 /* clear pending interrupts */
203 kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
204 kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
205
206 enable_irq(keypad_data->irq);
207
208 pm_runtime_put_sync(input->dev.parent);
209}
210
211static int __devinit omap4_keypad_probe(struct platform_device *pdev)
212{
213 const struct omap4_keypad_platform_data *pdata;
214 struct omap4_keypad *keypad_data;
215 struct input_dev *input_dev;
216 struct resource *res;
217 resource_size_t size;
218 unsigned int row_shift, max_keys;
219 int rev;
220 int irq;
221 int error;
222
223 /* platform data */
224 pdata = pdev->dev.platform_data;
225 if (!pdata) {
226 dev_err(&pdev->dev, "no platform data defined\n");
227 return -EINVAL;
228 }
229
230 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
231 if (!res) {
232 dev_err(&pdev->dev, "no base address specified\n");
233 return -EINVAL;
234 }
235
236 irq = platform_get_irq(pdev, 0);
237 if (!irq) {
238 dev_err(&pdev->dev, "no keyboard irq assigned\n");
239 return -EINVAL;
240 }
241
242 if (!pdata->keymap_data) {
243 dev_err(&pdev->dev, "no keymap data defined\n");
244 return -EINVAL;
245 }
246
247 row_shift = get_count_order(pdata->cols);
248 max_keys = pdata->rows << row_shift;
249
250 keypad_data = kzalloc(sizeof(struct omap4_keypad) +
251 max_keys * sizeof(keypad_data->keymap[0]),
252 GFP_KERNEL);
253 if (!keypad_data) {
254 dev_err(&pdev->dev, "keypad_data memory allocation failed\n");
255 return -ENOMEM;
256 }
257
258 size = resource_size(res);
259
260 res = request_mem_region(res->start, size, pdev->name);
261 if (!res) {
262 dev_err(&pdev->dev, "can't request mem region\n");
263 error = -EBUSY;
264 goto err_free_keypad;
265 }
266
267 keypad_data->base = ioremap(res->start, resource_size(res));
268 if (!keypad_data->base) {
269 dev_err(&pdev->dev, "can't ioremap mem resource\n");
270 error = -ENOMEM;
271 goto err_release_mem;
272 }
273
274 keypad_data->irq = irq;
275 keypad_data->row_shift = row_shift;
276 keypad_data->rows = pdata->rows;
277 keypad_data->cols = pdata->cols;
278
279 /*
280 * Enable clocks for the keypad module so that we can read
281 * revision register.
282 */
283 pm_runtime_enable(&pdev->dev);
284 error = pm_runtime_get_sync(&pdev->dev);
285 if (error) {
286 dev_err(&pdev->dev, "pm_runtime_get_sync() failed\n");
287 goto err_unmap;
288 }
289 rev = __raw_readl(keypad_data->base + OMAP4_KBD_REVISION);
290 rev &= 0x03 << 30;
291 rev >>= 30;
292 switch (rev) {
293 case KBD_REVISION_OMAP4:
294 keypad_data->reg_offset = 0x00;
295 keypad_data->irqreg_offset = 0x00;
296 break;
297 case KBD_REVISION_OMAP5:
298 keypad_data->reg_offset = 0x10;
299 keypad_data->irqreg_offset = 0x0c;
300 break;
301 default:
302 dev_err(&pdev->dev,
303 "Keypad reports unsupported revision %d", rev);
304 error = -EINVAL;
305 goto err_pm_put_sync;
306 }
307
308 /* input device allocation */
309 keypad_data->input = input_dev = input_allocate_device();
310 if (!input_dev) {
311 error = -ENOMEM;
312 goto err_pm_put_sync;
313 }
314
315 input_dev->name = pdev->name;
316 input_dev->dev.parent = &pdev->dev;
317 input_dev->id.bustype = BUS_HOST;
318 input_dev->id.vendor = 0x0001;
319 input_dev->id.product = 0x0001;
320 input_dev->id.version = 0x0001;
321
322 input_dev->open = omap4_keypad_open;
323 input_dev->close = omap4_keypad_close;
324
325 error = matrix_keypad_build_keymap(pdata->keymap_data, NULL,
326 pdata->rows, pdata->cols,
327 keypad_data->keymap, input_dev);
328 if (error) {
329 dev_err(&pdev->dev, "failed to build keymap\n");
330 goto err_free_input;
331 }
332
333 __set_bit(EV_REP, input_dev->evbit);
334 input_set_capability(input_dev, EV_MSC, MSC_SCAN);
335
336 input_set_drvdata(input_dev, keypad_data);
337
338 error = request_irq(keypad_data->irq, omap4_keypad_interrupt,
339 IRQF_TRIGGER_RISING,
340 "omap4-keypad", keypad_data);
341 if (error) {
342 dev_err(&pdev->dev, "failed to register interrupt\n");
343 goto err_free_input;
344 }
345
346 pm_runtime_put_sync(&pdev->dev);
347
348 error = input_register_device(keypad_data->input);
349 if (error < 0) {
350 dev_err(&pdev->dev, "failed to register input device\n");
351 goto err_pm_disable;
352 }
353
354 platform_set_drvdata(pdev, keypad_data);
355 return 0;
356
357err_pm_disable:
358 pm_runtime_disable(&pdev->dev);
359 free_irq(keypad_data->irq, keypad_data);
360err_free_input:
361 input_free_device(input_dev);
362err_pm_put_sync:
363 pm_runtime_put_sync(&pdev->dev);
364err_unmap:
365 iounmap(keypad_data->base);
366err_release_mem:
367 release_mem_region(res->start, size);
368err_free_keypad:
369 kfree(keypad_data);
370 return error;
371}
372
373static int __devexit omap4_keypad_remove(struct platform_device *pdev)
374{
375 struct omap4_keypad *keypad_data = platform_get_drvdata(pdev);
376 struct resource *res;
377
378 free_irq(keypad_data->irq, keypad_data);
379
380 pm_runtime_disable(&pdev->dev);
381
382 input_unregister_device(keypad_data->input);
383
384 iounmap(keypad_data->base);
385
386 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
387 release_mem_region(res->start, resource_size(res));
388
389 kfree(keypad_data);
390 platform_set_drvdata(pdev, NULL);
391
392 return 0;
393}
394
395static struct platform_driver omap4_keypad_driver = {
396 .probe = omap4_keypad_probe,
397 .remove = __devexit_p(omap4_keypad_remove),
398 .driver = {
399 .name = "omap4-keypad",
400 .owner = THIS_MODULE,
401 },
402};
403module_platform_driver(omap4_keypad_driver);
404
405MODULE_AUTHOR("Texas Instruments");
406MODULE_DESCRIPTION("OMAP4 Keypad Driver");
407MODULE_LICENSE("GPL");
408MODULE_ALIAS("platform:omap4-keypad");