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
35 struct 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 */
max8925_onkey_handler(int irq,void * data)47 static 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
max8925_onkey_probe(struct platform_device * pdev)66 static 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 return -EINVAL;
76
77 irq[1] = platform_get_irq(pdev, 1);
78 if (irq[1] < 0)
79 return -EINVAL;
80
81 info = devm_kzalloc(&pdev->dev, sizeof(struct max8925_onkey_info),
82 GFP_KERNEL);
83 if (!info)
84 return -ENOMEM;
85
86 input = devm_input_allocate_device(&pdev->dev);
87 if (!input)
88 return -ENOMEM;
89
90 info->idev = input;
91 info->i2c = chip->i2c;
92 info->dev = &pdev->dev;
93 info->irq[0] = irq[0];
94 info->irq[1] = irq[1];
95
96 input->name = "max8925_on";
97 input->phys = "max8925_on/input0";
98 input->id.bustype = BUS_I2C;
99 input->dev.parent = &pdev->dev;
100 input_set_capability(input, EV_KEY, KEY_POWER);
101
102 error = devm_request_threaded_irq(&pdev->dev, irq[0], NULL,
103 max8925_onkey_handler, IRQF_ONESHOT,
104 "onkey-down", info);
105 if (error < 0) {
106 dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
107 irq[0], error);
108 return error;
109 }
110
111 error = devm_request_threaded_irq(&pdev->dev, irq[1], NULL,
112 max8925_onkey_handler, IRQF_ONESHOT,
113 "onkey-up", info);
114 if (error < 0) {
115 dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
116 irq[1], error);
117 return error;
118 }
119
120 error = input_register_device(info->idev);
121 if (error) {
122 dev_err(chip->dev, "Can't register input device: %d\n", error);
123 return error;
124 }
125
126 platform_set_drvdata(pdev, info);
127 device_init_wakeup(&pdev->dev, 1);
128
129 return 0;
130 }
131
max8925_onkey_suspend(struct device * dev)132 static int __maybe_unused max8925_onkey_suspend(struct device *dev)
133 {
134 struct platform_device *pdev = to_platform_device(dev);
135 struct max8925_onkey_info *info = platform_get_drvdata(pdev);
136 struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
137
138 if (device_may_wakeup(dev)) {
139 chip->wakeup_flag |= 1 << info->irq[0];
140 chip->wakeup_flag |= 1 << info->irq[1];
141 }
142
143 return 0;
144 }
145
max8925_onkey_resume(struct device * dev)146 static int __maybe_unused max8925_onkey_resume(struct device *dev)
147 {
148 struct platform_device *pdev = to_platform_device(dev);
149 struct max8925_onkey_info *info = platform_get_drvdata(pdev);
150 struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
151
152 if (device_may_wakeup(dev)) {
153 chip->wakeup_flag &= ~(1 << info->irq[0]);
154 chip->wakeup_flag &= ~(1 << info->irq[1]);
155 }
156
157 return 0;
158 }
159
160 static SIMPLE_DEV_PM_OPS(max8925_onkey_pm_ops, max8925_onkey_suspend, max8925_onkey_resume);
161
162 static struct platform_driver max8925_onkey_driver = {
163 .driver = {
164 .name = "max8925-onkey",
165 .pm = &max8925_onkey_pm_ops,
166 },
167 .probe = max8925_onkey_probe,
168 };
169 module_platform_driver(max8925_onkey_driver);
170
171 MODULE_DESCRIPTION("Maxim MAX8925 ONKEY driver");
172 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
173 MODULE_LICENSE("GPL");
174
