summaryrefslogtreecommitdiff
path: root/drivers/input/misc/axp20x-pek.c
blob: 400869e61a0663be592e723f8f9de4f3596aaf3d (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
/*
 * 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_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>

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

struct axp20x_pek {
	struct axp20x_dev *axp20x;
	struct input_dev *input;
	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 shutdown_time[] = {
	{ .time = 4000,  .idx = 0 },
	{ .time = 6000,  .idx = 1 },
	{ .time = 8000,  .idx = 2 },
	{ .time = 10000, .idx = 3 },
};

struct axp20x_pek_ext_attr {
	const struct axp20x_time *p_time;
	unsigned int mask;
};

static struct axp20x_pek_ext_attr axp20x_pek_startup_ext_attr = {
	.p_time	= startup_time,
	.mask	= AXP20X_PEK_STARTUP_MASK,
};

static struct axp20x_pek_ext_attr axp20x_pek_shutdown_ext_attr = {
	.p_time	= shutdown_time,
	.mask	= AXP20X_PEK_SHUTDOWN_MASK,
};

static struct axp20x_pek_ext_attr *get_axp_ext_attr(struct device_attribute *attr)
{
	return container_of(attr, struct dev_ext_attribute, attr)->var;
}

static ssize_t axp20x_show_ext_attr(struct device *dev,
				    struct device_attribute *attr, char *buf)
{
	struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
	struct axp20x_pek_ext_attr *axp20x_ea = get_axp_ext_attr(attr);
	unsigned int val;
	int ret, i;

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

	val &= axp20x_ea->mask;
	val >>= ffs(axp20x_ea->mask) - 1;

	for (i = 0; i < 4; i++)
		if (val == axp20x_ea->p_time[i].idx)
			val = axp20x_ea->p_time[i].time;

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

static ssize_t axp20x_store_ext_attr(struct device *dev,
				     struct device_attribute *attr,
				     const char *buf, size_t count)
{
	struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
	struct axp20x_pek_ext_attr *axp20x_ea = get_axp_ext_attr(attr);
	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(axp20x_ea->p_time[i].time - val);
		if (err < best_err) {
			best_err = err;
			idx = axp20x_ea->p_time[i].idx;
		}

		if (!err)
			break;
	}

	idx <<= ffs(axp20x_ea->mask) - 1;
	ret = regmap_update_bits(axp20x_pek->axp20x->regmap,
				 AXP20X_PEK_KEY,
				 axp20x_ea->mask, idx);
	if (ret != 0)
		return -EINVAL;

	return count;
}

static struct dev_ext_attribute axp20x_dev_attr_startup = {
	.attr	= __ATTR(startup, 0644, axp20x_show_ext_attr, axp20x_store_ext_attr),
	.var	= &axp20x_pek_startup_ext_attr,
};

static struct dev_ext_attribute axp20x_dev_attr_shutdown = {
	.attr	= __ATTR(shutdown, 0644, axp20x_show_ext_attr, axp20x_store_ext_attr),
	.var	= &axp20x_pek_shutdown_ext_attr,
};

static struct attribute *axp20x_attributes[] = {
	&axp20x_dev_attr_startup.attr.attr,
	&axp20x_dev_attr_shutdown.attr.attr,
	NULL,
};

static const struct attribute_group axp20x_attribute_group = {
	.attrs = axp20x_attributes,
};

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 void axp20x_remove_sysfs_group(void *_data)
{
	struct device *dev = _data;

	sysfs_remove_group(&dev->kobj, &axp20x_attribute_group);
}

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) {
		dev_err(&pdev->dev, "No IRQ for PEK_DBR, error=%d\n",
				axp20x_pek->irq_dbr);
		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) {
		dev_err(&pdev->dev, "No IRQ for PEK_DBF, error=%d\n",
				axp20x_pek->irq_dbf);
		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;
	}

	return 0;
}

#ifdef CONFIG_ACPI
static bool axp20x_pek_should_register_input(struct axp20x_pek *axp20x_pek,
					     struct platform_device *pdev)
{
	unsigned long long hrv = 0;
	acpi_status status;

	if (IS_ENABLED(CONFIG_INPUT_SOC_BUTTON_ARRAY) &&
	    axp20x_pek->axp20x->variant == AXP288_ID) {
		status = acpi_evaluate_integer(ACPI_HANDLE(pdev->dev.parent),
					       "_HRV", NULL, &hrv);
		if (ACPI_FAILURE(status))
			dev_err(&pdev->dev, "Failed to get PMIC hardware revision\n");

		/*
		 * 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 (hrv == 3 && (acpi_dev_present("INTCFD9", NULL, -1) ||
				 acpi_dev_present("ACPI0011", NULL, -1)))
			return false;

	}

	return true;
}
#else
static bool axp20x_pek_should_register_input(struct axp20x_pek *axp20x_pek,
					     struct platform_device *pdev)
{
	return true;
}
#endif

static int axp20x_pek_probe(struct platform_device *pdev)
{
	struct axp20x_pek *axp20x_pek;
	int error;

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

	error = sysfs_create_group(&pdev->dev.kobj, &axp20x_attribute_group);
	if (error) {
		dev_err(&pdev->dev, "Failed to create sysfs attributes: %d\n",
			error);
		return error;
	}

	error = devm_add_action(&pdev->dev,
				axp20x_remove_sysfs_group, &pdev->dev);
	if (error) {
		axp20x_remove_sysfs_group(&pdev->dev);
		dev_err(&pdev->dev, "Failed to add sysfs cleanup action: %d\n",
			error);
		return error;
	}

	platform_set_drvdata(pdev, axp20x_pek);

	return 0;
}

static struct platform_driver axp20x_pek_driver = {
	.probe		= axp20x_pek_probe,
	.driver		= {
		.name		= "axp20x-pek",
	},
};
module_platform_driver(axp20x_pek_driver);

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