1/**
2 * MAX8925 ONKEY driver
3 *
4 * Copyright (C) 2009 Marvell International Ltd.
5 * Haojian Zhuang <haojian.zhuang@marvell.com>
6 *
7 * This file is subject to the terms and conditions of the GNU General
8 * Public License. See the file "COPYING" in the main directory of this
9 * archive for more details.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21#include <linux/kernel.h>
22#include <linux/module.h>
23#include <linux/platform_device.h>
24#include <linux/i2c.h>
25#include <linux/input.h>
26#include <linux/interrupt.h>
27#include <linux/mfd/max8925.h>
28#include <linux/slab.h>
29#include <linux/device.h>
30
31#define SW_INPUT (1 << 7) /* 0/1 -- up/down */
32#define HARDRESET_EN (1 << 7)
33#define PWREN_EN (1 << 7)
34
35struct max8925_onkey_info {
36 struct input_dev *idev;
37 struct i2c_client *i2c;
38 struct device *dev;
39 unsigned int irq[2];
40};
41
42/*
43 * MAX8925 gives us an interrupt when ONKEY is pressed or released.
44 * max8925_set_bits() operates I2C bus and may sleep. So implement
45 * it in thread IRQ handler.
46 */
47static irqreturn_t max8925_onkey_handler(int irq, void *data)
48{
49 struct max8925_onkey_info *info = data;
50 int state;
51
52 state = max8925_reg_read(info->i2c, MAX8925_ON_OFF_STATUS);
53
54 input_report_key(info->idev, KEY_POWER, state & SW_INPUT);
55 input_sync(info->idev);
56
57 dev_dbg(info->dev, "onkey state:%d\n", state);
58
59 /* Enable hardreset to halt if system isn't shutdown on time */
60 max8925_set_bits(info->i2c, MAX8925_SYSENSEL,
61 HARDRESET_EN, HARDRESET_EN);
62
63 return IRQ_HANDLED;
64}
65
66static int max8925_onkey_probe(struct platform_device *pdev)
67{
68 struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
69 struct max8925_onkey_info *info;
70 struct input_dev *input;
71 int irq[2], error;
72
73 irq[0] = platform_get_irq(pdev, 0);
74 if (irq[0] < 0) {
75 dev_err(&pdev->dev, "No IRQ resource!\n");
76 return -EINVAL;
77 }
78
79 irq[1] = platform_get_irq(pdev, 1);
80 if (irq[1] < 0) {
81 dev_err(&pdev->dev, "No IRQ resource!\n");
82 return -EINVAL;
83 }
84
85 info = devm_kzalloc(&pdev->dev, sizeof(struct max8925_onkey_info),
86 GFP_KERNEL);
87 if (!info)
88 return -ENOMEM;
89
90 input = devm_input_allocate_device(&pdev->dev);
91 if (!input)
92 return -ENOMEM;
93
94 info->idev = input;
95 info->i2c = chip->i2c;
96 info->dev = &pdev->dev;
97 info->irq[0] = irq[0];
98 info->irq[1] = irq[1];
99
100 input->name = "max8925_on";
101 input->phys = "max8925_on/input0";
102 input->id.bustype = BUS_I2C;
103 input->dev.parent = &pdev->dev;
104 input_set_capability(input, EV_KEY, KEY_POWER);
105
106 error = devm_request_threaded_irq(&pdev->dev, irq[0], NULL,
107 max8925_onkey_handler, IRQF_ONESHOT,
108 "onkey-down", info);
109 if (error < 0) {
110 dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
111 irq[0], error);
112 return error;
113 }
114
115 error = devm_request_threaded_irq(&pdev->dev, irq[1], NULL,
116 max8925_onkey_handler, IRQF_ONESHOT,
117 "onkey-up", info);
118 if (error < 0) {
119 dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
120 irq[1], error);
121 return error;
122 }
123
124 error = input_register_device(info->idev);
125 if (error) {
126 dev_err(chip->dev, "Can't register input device: %d\n", error);
127 return error;
128 }
129
130 platform_set_drvdata(pdev, info);
131 device_init_wakeup(&pdev->dev, 1);
132
133 return 0;
134}
135
136static int __maybe_unused max8925_onkey_suspend(struct device *dev)
137{
138 struct platform_device *pdev = to_platform_device(dev);
139 struct max8925_onkey_info *info = platform_get_drvdata(pdev);
140 struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
141
142 if (device_may_wakeup(dev)) {
143 chip->wakeup_flag |= 1 << info->irq[0];
144 chip->wakeup_flag |= 1 << info->irq[1];
145 }
146
147 return 0;
148}
149
150static int __maybe_unused max8925_onkey_resume(struct device *dev)
151{
152 struct platform_device *pdev = to_platform_device(dev);
153 struct max8925_onkey_info *info = platform_get_drvdata(pdev);
154 struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
155
156 if (device_may_wakeup(dev)) {
157 chip->wakeup_flag &= ~(1 << info->irq[0]);
158 chip->wakeup_flag &= ~(1 << info->irq[1]);
159 }
160
161 return 0;
162}
163
164static SIMPLE_DEV_PM_OPS(max8925_onkey_pm_ops, max8925_onkey_suspend, max8925_onkey_resume);
165
166static struct platform_driver max8925_onkey_driver = {
167 .driver = {
168 .name = "max8925-onkey",
169 .pm = &max8925_onkey_pm_ops,
170 },
171 .probe = max8925_onkey_probe,
172};
173module_platform_driver(max8925_onkey_driver);
174
175MODULE_DESCRIPTION("Maxim MAX8925 ONKEY driver");
176MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
177MODULE_LICENSE("GPL");
178