1 /*
2 * 88pm860x_onkey.c - Marvell 88PM860x ONKEY driver
3 *
4 * Copyright (C) 2009-2010 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/88pm860x.h>
28 #include <linux/slab.h>
29 #include <linux/device.h>
30
31 #define PM8607_WAKEUP 0x0b
32
33 #define LONG_ONKEY_EN (1 << 1)
34 #define ONKEY_STATUS (1 << 0)
35
36 struct pm860x_onkey_info {
37 struct input_dev *idev;
38 struct pm860x_chip *chip;
39 struct i2c_client *i2c;
40 struct device *dev;
41 int irq;
42 };
43
44 /* 88PM860x gives us an interrupt when ONKEY is held */
pm860x_onkey_handler(int irq,void * data)45 static irqreturn_t pm860x_onkey_handler(int irq, void *data)
46 {
47 struct pm860x_onkey_info *info = data;
48 int ret;
49
50 ret = pm860x_reg_read(info->i2c, PM8607_STATUS_2);
51 ret &= ONKEY_STATUS;
52 input_report_key(info->idev, KEY_POWER, ret);
53 input_sync(info->idev);
54
55 /* Enable 8-second long onkey detection */
56 pm860x_set_bits(info->i2c, PM8607_WAKEUP, 3, LONG_ONKEY_EN);
57 return IRQ_HANDLED;
58 }
59
pm860x_onkey_probe(struct platform_device * pdev)60 static int pm860x_onkey_probe(struct platform_device *pdev)
61 {
62 struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
63 struct pm860x_onkey_info *info;
64 int irq, ret;
65
66 irq = platform_get_irq(pdev, 0);
67 if (irq < 0)
68 return -EINVAL;
69
70 info = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_onkey_info),
71 GFP_KERNEL);
72 if (!info)
73 return -ENOMEM;
74 info->chip = chip;
75 info->i2c = (chip->id == CHIP_PM8607) ? chip->client : chip->companion;
76 info->dev = &pdev->dev;
77 info->irq = irq;
78
79 info->idev = devm_input_allocate_device(&pdev->dev);
80 if (!info->idev) {
81 dev_err(chip->dev, "Failed to allocate input dev\n");
82 return -ENOMEM;
83 }
84
85 info->idev->name = "88pm860x_on";
86 info->idev->phys = "88pm860x_on/input0";
87 info->idev->id.bustype = BUS_I2C;
88 info->idev->dev.parent = &pdev->dev;
89 info->idev->evbit[0] = BIT_MASK(EV_KEY);
90 info->idev->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);
91
92 ret = input_register_device(info->idev);
93 if (ret) {
94 dev_err(chip->dev, "Can't register input device: %d\n", ret);
95 return ret;
96 }
97
98 ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL,
99 pm860x_onkey_handler, IRQF_ONESHOT,
100 "onkey", info);
101 if (ret < 0) {
102 dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
103 info->irq, ret);
104 return ret;
105 }
106
107 platform_set_drvdata(pdev, info);
108 device_init_wakeup(&pdev->dev, 1);
109
110 return 0;
111 }
112
pm860x_onkey_suspend(struct device * dev)113 static int pm860x_onkey_suspend(struct device *dev)
114 {
115 struct platform_device *pdev = to_platform_device(dev);
116 struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
117
118 if (device_may_wakeup(dev))
119 chip->wakeup_flag |= 1 << PM8607_IRQ_ONKEY;
120 return 0;
121 }
pm860x_onkey_resume(struct device * dev)122 static int pm860x_onkey_resume(struct device *dev)
123 {
124 struct platform_device *pdev = to_platform_device(dev);
125 struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
126
127 if (device_may_wakeup(dev))
128 chip->wakeup_flag &= ~(1 << PM8607_IRQ_ONKEY);
129 return 0;
130 }
131
132 static DEFINE_SIMPLE_DEV_PM_OPS(pm860x_onkey_pm_ops,
133 pm860x_onkey_suspend, pm860x_onkey_resume);
134
135 static struct platform_driver pm860x_onkey_driver = {
136 .driver = {
137 .name = "88pm860x-onkey",
138 .pm = pm_sleep_ptr(&pm860x_onkey_pm_ops),
139 },
140 .probe = pm860x_onkey_probe,
141 };
142 module_platform_driver(pm860x_onkey_driver);
143
144 MODULE_DESCRIPTION("Marvell 88PM860x ONKEY driver");
145 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
146 MODULE_LICENSE("GPL");
147