blob: 80af4460801862b52039663c1f58fbb2b8434bbd [file] [log] [blame]
Haojian Zhuang37345742010-05-22 00:57:26 -07001/**
2 * max8925_onkey.c - 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
30#define HARDRESET_EN (1 << 7)
31#define PWREN_EN (1 << 7)
32
33struct max8925_onkey_info {
34 struct input_dev *idev;
35 struct i2c_client *i2c;
36 int irq;
37};
38
39/*
40 * MAX8925 gives us an interrupt when ONKEY is held for 3 seconds.
41 * max8925_set_bits() operates I2C bus and may sleep. So implement
42 * it in thread IRQ handler.
43 */
44static irqreturn_t max8925_onkey_handler(int irq, void *data)
45{
46 struct max8925_onkey_info *info = data;
47
48 input_report_key(info->idev, KEY_POWER, 1);
49 input_sync(info->idev);
50
51 /* Enable hardreset to halt if system isn't shutdown on time */
52 max8925_set_bits(info->i2c, MAX8925_SYSENSEL,
53 HARDRESET_EN, HARDRESET_EN);
54
55 return IRQ_HANDLED;
56}
57
58static int __devinit max8925_onkey_probe(struct platform_device *pdev)
59{
60 struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
61 struct max8925_onkey_info *info;
62 int error;
63
64 info = kzalloc(sizeof(struct max8925_onkey_info), GFP_KERNEL);
65 if (!info)
66 return -ENOMEM;
67
68 info->i2c = chip->i2c;
69 info->irq = chip->irq_base + MAX8925_IRQ_GPM_SW_3SEC;
70
71 info->idev = input_allocate_device();
72 if (!info->idev) {
73 dev_err(chip->dev, "Failed to allocate input dev\n");
74 error = -ENOMEM;
75 goto out_input;
76 }
77
78 info->idev->name = "max8925_on";
79 info->idev->phys = "max8925_on/input0";
80 info->idev->id.bustype = BUS_I2C;
81 info->idev->dev.parent = &pdev->dev;
82 info->idev->evbit[0] = BIT_MASK(EV_KEY);
83 info->idev->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);
84
85 error = request_threaded_irq(info->irq, NULL, max8925_onkey_handler,
86 IRQF_ONESHOT, "onkey", info);
87 if (error < 0) {
88 dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
89 info->irq, error);
90 goto out_irq;
91 }
92
93 error = input_register_device(info->idev);
94 if (error) {
95 dev_err(chip->dev, "Can't register input device: %d\n", error);
96 goto out;
97 }
98
99 platform_set_drvdata(pdev, info);
100
101 return 0;
102
103out:
104 free_irq(info->irq, info);
105out_irq:
106 input_free_device(info->idev);
107out_input:
108 kfree(info);
109 return error;
110}
111
112static int __devexit max8925_onkey_remove(struct platform_device *pdev)
113{
114 struct max8925_onkey_info *info = platform_get_drvdata(pdev);
115
116 free_irq(info->irq, info);
117 input_unregister_device(info->idev);
118 kfree(info);
119
120 platform_set_drvdata(pdev, NULL);
121
122 return 0;
123}
124
125static struct platform_driver max8925_onkey_driver = {
126 .driver = {
127 .name = "max8925-onkey",
128 .owner = THIS_MODULE,
129 },
130 .probe = max8925_onkey_probe,
131 .remove = __devexit_p(max8925_onkey_remove),
132};
133
134static int __init max8925_onkey_init(void)
135{
136 return platform_driver_register(&max8925_onkey_driver);
137}
138module_init(max8925_onkey_init);
139
140static void __exit max8925_onkey_exit(void)
141{
142 platform_driver_unregister(&max8925_onkey_driver);
143}
144module_exit(max8925_onkey_exit);
145
146MODULE_DESCRIPTION("Maxim MAX8925 ONKEY driver");
147MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
148MODULE_LICENSE("GPL");