1/* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
2 *
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License version 2 and
5 * only version 2 as published by the Free Software Foundation.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
10 * GNU General Public License for more details.
11 */
12
13#include <linux/module.h>
14#include <linux/kernel.h>
15#include <linux/errno.h>
16#include <linux/slab.h>
17#include <linux/input.h>
18#include <linux/interrupt.h>
19#include <linux/platform_device.h>
20#include <linux/regmap.h>
21#include <linux/log2.h>
22#include <linux/of.h>
23
24#define PON_CNTL_1 0x1C
25#define PON_CNTL_PULL_UP BIT(7)
26#define PON_CNTL_TRIG_DELAY_MASK (0x7)
27
28/**
29 * struct pmic8xxx_pwrkey - pmic8xxx pwrkey information
30 * @key_press_irq: key press irq number
31 */
32struct pmic8xxx_pwrkey {
33	int key_press_irq;
34};
35
36static irqreturn_t pwrkey_press_irq(int irq, void *_pwr)
37{
38	struct input_dev *pwr = _pwr;
39
40	input_report_key(pwr, KEY_POWER, 1);
41	input_sync(pwr);
42
43	return IRQ_HANDLED;
44}
45
46static irqreturn_t pwrkey_release_irq(int irq, void *_pwr)
47{
48	struct input_dev *pwr = _pwr;
49
50	input_report_key(pwr, KEY_POWER, 0);
51	input_sync(pwr);
52
53	return IRQ_HANDLED;
54}
55
56static int __maybe_unused pmic8xxx_pwrkey_suspend(struct device *dev)
57{
58	struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);
59
60	if (device_may_wakeup(dev))
61		enable_irq_wake(pwrkey->key_press_irq);
62
63	return 0;
64}
65
66static int __maybe_unused pmic8xxx_pwrkey_resume(struct device *dev)
67{
68	struct pmic8xxx_pwrkey *pwrkey = dev_get_drvdata(dev);
69
70	if (device_may_wakeup(dev))
71		disable_irq_wake(pwrkey->key_press_irq);
72
73	return 0;
74}
75
76static SIMPLE_DEV_PM_OPS(pm8xxx_pwr_key_pm_ops,
77		pmic8xxx_pwrkey_suspend, pmic8xxx_pwrkey_resume);
78
79static int pmic8xxx_pwrkey_probe(struct platform_device *pdev)
80{
81	struct input_dev *pwr;
82	int key_release_irq = platform_get_irq(pdev, 0);
83	int key_press_irq = platform_get_irq(pdev, 1);
84	int err;
85	unsigned int delay;
86	unsigned int pon_cntl;
87	struct regmap *regmap;
88	struct pmic8xxx_pwrkey *pwrkey;
89	u32 kpd_delay;
90	bool pull_up;
91
92	if (of_property_read_u32(pdev->dev.of_node, "debounce", &kpd_delay))
93		kpd_delay = 15625;
94
95	if (kpd_delay > 62500 || kpd_delay == 0) {
96		dev_err(&pdev->dev, "invalid power key trigger delay\n");
97		return -EINVAL;
98	}
99
100	pull_up = of_property_read_bool(pdev->dev.of_node, "pull-up");
101
102	regmap = dev_get_regmap(pdev->dev.parent, NULL);
103	if (!regmap) {
104		dev_err(&pdev->dev, "failed to locate regmap for the device\n");
105		return -ENODEV;
106	}
107
108	pwrkey = devm_kzalloc(&pdev->dev, sizeof(*pwrkey), GFP_KERNEL);
109	if (!pwrkey)
110		return -ENOMEM;
111
112	pwrkey->key_press_irq = key_press_irq;
113
114	pwr = devm_input_allocate_device(&pdev->dev);
115	if (!pwr) {
116		dev_dbg(&pdev->dev, "Can't allocate power button\n");
117		return -ENOMEM;
118	}
119
120	input_set_capability(pwr, EV_KEY, KEY_POWER);
121
122	pwr->name = "pmic8xxx_pwrkey";
123	pwr->phys = "pmic8xxx_pwrkey/input0";
124
125	delay = (kpd_delay << 10) / USEC_PER_SEC;
126	delay = 1 + ilog2(delay);
127
128	err = regmap_read(regmap, PON_CNTL_1, &pon_cntl);
129	if (err < 0) {
130		dev_err(&pdev->dev, "failed reading PON_CNTL_1 err=%d\n", err);
131		return err;
132	}
133
134	pon_cntl &= ~PON_CNTL_TRIG_DELAY_MASK;
135	pon_cntl |= (delay & PON_CNTL_TRIG_DELAY_MASK);
136	if (pull_up)
137		pon_cntl |= PON_CNTL_PULL_UP;
138	else
139		pon_cntl &= ~PON_CNTL_PULL_UP;
140
141	err = regmap_write(regmap, PON_CNTL_1, pon_cntl);
142	if (err < 0) {
143		dev_err(&pdev->dev, "failed writing PON_CNTL_1 err=%d\n", err);
144		return err;
145	}
146
147	err = devm_request_irq(&pdev->dev, key_press_irq, pwrkey_press_irq,
148			       IRQF_TRIGGER_RISING,
149			       "pmic8xxx_pwrkey_press", pwr);
150	if (err) {
151		dev_err(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
152			key_press_irq, err);
153		return err;
154	}
155
156	err = devm_request_irq(&pdev->dev, key_release_irq, pwrkey_release_irq,
157			       IRQF_TRIGGER_RISING,
158			       "pmic8xxx_pwrkey_release", pwr);
159	if (err) {
160		dev_err(&pdev->dev, "Can't get %d IRQ for pwrkey: %d\n",
161			key_release_irq, err);
162		return err;
163	}
164
165	err = input_register_device(pwr);
166	if (err) {
167		dev_err(&pdev->dev, "Can't register power key: %d\n", err);
168		return err;
169	}
170
171	platform_set_drvdata(pdev, pwrkey);
172	device_init_wakeup(&pdev->dev, 1);
173
174	return 0;
175}
176
177static int pmic8xxx_pwrkey_remove(struct platform_device *pdev)
178{
179	device_init_wakeup(&pdev->dev, 0);
180
181	return 0;
182}
183
184static const struct of_device_id pm8xxx_pwr_key_id_table[] = {
185	{ .compatible = "qcom,pm8058-pwrkey" },
186	{ .compatible = "qcom,pm8921-pwrkey" },
187	{ }
188};
189MODULE_DEVICE_TABLE(of, pm8xxx_pwr_key_id_table);
190
191static struct platform_driver pmic8xxx_pwrkey_driver = {
192	.probe		= pmic8xxx_pwrkey_probe,
193	.remove		= pmic8xxx_pwrkey_remove,
194	.driver		= {
195		.name	= "pm8xxx-pwrkey",
196		.pm	= &pm8xxx_pwr_key_pm_ops,
197		.of_match_table = pm8xxx_pwr_key_id_table,
198	},
199};
200module_platform_driver(pmic8xxx_pwrkey_driver);
201
202MODULE_ALIAS("platform:pmic8xxx_pwrkey");
203MODULE_DESCRIPTION("PMIC8XXX Power Key driver");
204MODULE_LICENSE("GPL v2");
205MODULE_AUTHOR("Trilok Soni <tsoni@codeaurora.org>");
206