summaryrefslogtreecommitdiffstats
path: root/drivers/input/misc/axp20x-pek.c
blob: 04da7916eb70987f96f6873500c105a76d9c8c18 (plain)
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
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
/*
 * axp20x power button driver.
 *
 * Copyright (C) 2013 Carlo Caione <carlo@caione.org>
 *
 * This file is subject to the terms and conditions of the GNU General
 * Public License. See the file "COPYING" in the main directory of this
 * archive for more details.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 */

#include <linux/acpi.h>
#include <linux/errno.h>
#include <linux/irq.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/mfd/axp20x.h>
#include <linux/module.h>
#include <linux/platform_data/x86/soc.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>

#define AXP20X_PEK_STARTUP_MASK		(0xc0)
#define AXP20X_PEK_SHUTDOWN_MASK	(0x03)

struct axp20x_info {
	const struct axp20x_time *startup_time;
	unsigned int startup_mask;
	const struct axp20x_time *shutdown_time;
	unsigned int shutdown_mask;
};

struct axp20x_pek {
	struct axp20x_dev *axp20x;
	struct input_dev *input;
	struct axp20x_info *info;
	int irq_dbr;
	int irq_dbf;
};

struct axp20x_time {
	unsigned int time;
	unsigned int idx;
};

static const struct axp20x_time startup_time[] = {
	{ .time = 128,  .idx = 0 },
	{ .time = 1000, .idx = 2 },
	{ .time = 3000, .idx = 1 },
	{ .time = 2000, .idx = 3 },
};

static const struct axp20x_time axp221_startup_time[] = {
	{ .time = 128,  .idx = 0 },
	{ .time = 1000, .idx = 1 },
	{ .time = 2000, .idx = 2 },
	{ .time = 3000, .idx = 3 },
};

static const struct axp20x_time shutdown_time[] = {
	{ .time = 4000,  .idx = 0 },
	{ .time = 6000,  .idx = 1 },
	{ .time = 8000,  .idx = 2 },
	{ .time = 10000, .idx = 3 },
};

static const struct axp20x_info axp20x_info = {
	.startup_time = startup_time,
	.startup_mask = AXP20X_PEK_STARTUP_MASK,
	.shutdown_time = shutdown_time,
	.shutdown_mask = AXP20X_PEK_SHUTDOWN_MASK,
};

static const struct axp20x_info axp221_info = {
	.startup_time = axp221_startup_time,
	.startup_mask = AXP20X_PEK_STARTUP_MASK,
	.shutdown_time = shutdown_time,
	.shutdown_mask = AXP20X_PEK_SHUTDOWN_MASK,
};

static ssize_t axp20x_show_attr(struct device *dev,
				const struct axp20x_time *time,
				unsigned int mask, char *buf)
{
	struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
	unsigned int val;
	int ret, i;

	ret = regmap_read(axp20x_pek->axp20x->regmap, AXP20X_PEK_KEY, &val);
	if (ret != 0)
		return ret;

	val &= mask;
	val >>= ffs(mask) - 1;

	for (i = 0; i < 4; i++)
		if (val == time[i].idx)
			val = time[i].time;

	return sprintf(buf, "%u\n", val);
}

static ssize_t axp20x_show_attr_startup(struct device *dev,
					struct device_attribute *attr,
					char *buf)
{
	struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);

	return axp20x_show_attr(dev, axp20x_pek->info->startup_time,
				axp20x_pek->info->startup_mask, buf);
}

static ssize_t axp20x_show_attr_shutdown(struct device *dev,
					 struct device_attribute *attr,
					 char *buf)
{
	struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);

	return axp20x_show_attr(dev, axp20x_pek->info->shutdown_time,
				axp20x_pek->info->shutdown_mask, buf);
}

static ssize_t axp20x_store_attr(struct device *dev,
				 const struct axp20x_time *time,
				 unsigned int mask, const char *buf,
				 size_t count)
{
	struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
	char val_str[20];
	size_t len;
	int ret, i;
	unsigned int val, idx = 0;
	unsigned int best_err = UINT_MAX;

	val_str[sizeof(val_str) - 1] = '\0';
	strncpy(val_str, buf, sizeof(val_str) - 1);
	len = strlen(val_str);

	if (len && val_str[len - 1] == '\n')
		val_str[len - 1] = '\0';

	ret = kstrtouint(val_str, 10, &val);
	if (ret)
		return ret;

	for (i = 3; i >= 0; i--) {
		unsigned int err;

		err = abs(time[i].time - val);
		if (err < best_err) {
			best_err = err;
			idx = time[i].idx;
		}

		if (!err)
			break;
	}

	idx <<= ffs(mask) - 1;
	ret = regmap_update_bits(axp20x_pek->axp20x->regmap, AXP20X_PEK_KEY,
				 mask, idx);
	if (ret != 0)
		return -EINVAL;

	return count;
}

static ssize_t axp20x_store_attr_startup(struct device *dev,
					 struct device_attribute *attr,
					 const char *buf, size_t count)
{
	struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);

	return axp20x_store_attr(dev, axp20x_pek->info->startup_time,
				 axp20x_pek->info->startup_mask, buf, count);
}

static ssize_t axp20x_store_attr_shutdown(struct device *dev,
					  struct device_attribute *attr,
					  const char *buf, size_t count)
{
	struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);

	return axp20x_store_attr(dev, axp20x_pek->info->shutdown_time,
				 axp20x_pek->info->shutdown_mask, buf, count);
}

static DEVICE_ATTR(startup, 0644, axp20x_show_attr_startup,
		   axp20x_store_attr_startup);
static DEVICE_ATTR(shutdown, 0644, axp20x_show_attr_shutdown,
		   axp20x_store_attr_shutdown);

static struct attribute *axp20x_attrs[] = {
	&dev_attr_startup.attr,
	&dev_attr_shutdown.attr,
	NULL,
};
ATTRIBUTE_GROUPS(axp20x);

static irqreturn_t axp20x_pek_irq(int irq, void *pwr)
{
	struct input_dev *idev = pwr;
	struct axp20x_pek *axp20x_pek = input_get_drvdata(idev);

	/*
	 * The power-button is connected to ground so a falling edge (dbf)
	 * means it is pressed.
	 */
	if (irq == axp20x_pek->irq_dbf)
		input_report_key(idev, KEY_POWER, true);
	else if (irq == axp20x_pek->irq_dbr)
		input_report_key(idev, KEY_POWER, false);

	input_sync(idev);

	return IRQ_HANDLED;
}

static int axp20x_pek_probe_input_device(struct axp20x_pek *axp20x_pek,
					 struct platform_device *pdev)
{
	struct axp20x_dev *axp20x = axp20x_pek->axp20x;
	struct input_dev *idev;
	int error;

	axp20x_pek->irq_dbr = platform_get_irq_byname(pdev, "PEK_DBR");
	if (axp20x_pek->irq_dbr < 0)
		return axp20x_pek->irq_dbr;
	axp20x_pek->irq_dbr = regmap_irq_get_virq(axp20x->regmap_irqc,
						  axp20x_pek->irq_dbr);

	axp20x_pek->irq_dbf = platform_get_irq_byname(pdev, "PEK_DBF");
	if (axp20x_pek->irq_dbf < 0)
		return axp20x_pek->irq_dbf;
	axp20x_pek->irq_dbf = regmap_irq_get_virq(axp20x->regmap_irqc,
						  axp20x_pek->irq_dbf);

	axp20x_pek->input = devm_input_allocate_device(&pdev->dev);
	if (!axp20x_pek->input)
		return -ENOMEM;

	idev = axp20x_pek->input;

	idev->name = "axp20x-pek";
	idev->phys = "m1kbd/input2";
	idev->dev.parent = &pdev->dev;

	input_set_capability(idev, EV_KEY, KEY_POWER);

	input_set_drvdata(idev, axp20x_pek);

	error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbr,
					     axp20x_pek_irq, 0,
					     "axp20x-pek-dbr", idev);
	if (error < 0) {
		dev_err(&pdev->dev, "Failed to request dbr IRQ#%d: %d\n",
			axp20x_pek->irq_dbr, error);
		return error;
	}

	error = devm_request_any_context_irq(&pdev->dev, axp20x_pek->irq_dbf,
					  axp20x_pek_irq, 0,
					  "axp20x-pek-dbf", idev);
	if (error < 0) {
		dev_err(&pdev->dev, "Failed to request dbf IRQ#%d: %d\n",
			axp20x_pek->irq_dbf, error);
		return error;
	}

	error = input_register_device(idev);
	if (error) {
		dev_err(&pdev->dev, "Can't register input device: %d\n",
			error);
		return error;
	}

	device_init_wakeup(&pdev->dev, true);

	return 0;
}

static bool axp20x_pek_should_register_input(struct axp20x_pek *axp20x_pek)
{
	if (IS_ENABLED(CONFIG_INPUT_SOC_BUTTON_ARRAY) &&
	    axp20x_pek->axp20x->variant == AXP288_ID) {
		/*
		 * On Cherry Trail platforms (hrv == 3), do not register the
		 * input device if there is an "INTCFD9" or "ACPI0011" gpio
		 * button ACPI device, as that handles the power button too,
		 * and otherwise we end up reporting all presses twice.
		 */
		if (soc_intel_is_cht() &&
				(acpi_dev_present("INTCFD9", NULL, -1) ||
				 acpi_dev_present("ACPI0011", NULL, -1)))
			return false;
	}

	return true;
}

static int axp20x_pek_probe(struct platform_device *pdev)
{
	struct axp20x_pek *axp20x_pek;
	const struct platform_device_id *match = platform_get_device_id(pdev);
	int error;

	if (!match) {
		dev_err(&pdev->dev, "Failed to get platform_device_id\n");
		return -EINVAL;
	}

	axp20x_pek = devm_kzalloc(&pdev->dev, sizeof(struct axp20x_pek),
				  GFP_KERNEL);
	if (!axp20x_pek)
		return -ENOMEM;

	axp20x_pek->axp20x = dev_get_drvdata(pdev->dev.parent);

	if (axp20x_pek_should_register_input(axp20x_pek)) {
		error = axp20x_pek_probe_input_device(axp20x_pek, pdev);
		if (error)
			return error;
	}

	axp20x_pek->info = (struct axp20x_info *)match->driver_data;

	platform_set_drvdata(pdev, axp20x_pek);

	return 0;
}

static int __maybe_unused axp20x_pek_suspend(struct device *dev)
{
	struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);

	/*
	 * As nested threaded IRQs are not automatically disabled during
	 * suspend, we must explicitly disable non-wakeup IRQs.
	 */
	if (device_may_wakeup(dev)) {
		enable_irq_wake(axp20x_pek->irq_dbf);
		enable_irq_wake(axp20x_pek->irq_dbr);
	} else {
		disable_irq(axp20x_pek->irq_dbf);
		disable_irq(axp20x_pek->irq_dbr);
	}

	return 0;
}

static int __maybe_unused axp20x_pek_resume(struct device *dev)
{
	struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);

	if (device_may_wakeup(dev)) {
		disable_irq_wake(axp20x_pek->irq_dbf);
		disable_irq_wake(axp20x_pek->irq_dbr);
	} else {
		enable_irq(axp20x_pek->irq_dbf);
		enable_irq(axp20x_pek->irq_dbr);
	}

	return 0;
}

static int __maybe_unused axp20x_pek_resume_noirq(struct device *dev)
{
	struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);

	if (axp20x_pek->axp20x->variant != AXP288_ID)
		return 0;

	/*
	 * Clear interrupts from button presses during suspend, to avoid
	 * a wakeup power-button press getting reported to userspace.
	 */
	regmap_write(axp20x_pek->axp20x->regmap,
		     AXP20X_IRQ1_STATE + AXP288_IRQ_POKN / 8,
		     BIT(AXP288_IRQ_POKN % 8));

	return 0;
}

static const struct dev_pm_ops axp20x_pek_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(axp20x_pek_suspend, axp20x_pek_resume)
#ifdef CONFIG_PM_SLEEP
	.resume_noirq = axp20x_pek_resume_noirq,
#endif
};

static const struct platform_device_id axp_pek_id_match[] = {
	{
		.name = "axp20x-pek",
		.driver_data = (kernel_ulong_t)&axp20x_info,
	},
	{
		.name = "axp221-pek",
		.driver_data = (kernel_ulong_t)&axp221_info,
	},
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, axp_pek_id_match);

static struct platform_driver axp20x_pek_driver = {
	.probe		= axp20x_pek_probe,
	.id_table	= axp_pek_id_match,
	.driver		= {
		.name		= "axp20x-pek",
		.pm		= &axp20x_pek_pm_ops,
		.dev_groups	= axp20x_groups,
	},
};
module_platform_driver(axp20x_pek_driver);

MODULE_DESCRIPTION("axp20x Power Button");
MODULE_AUTHOR("Carlo Caione <carlo@caione.org>");
MODULE_LICENSE("GPL");