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		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
132static int 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
146static int 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
160static DEFINE_SIMPLE_DEV_PM_OPS(max8925_onkey_pm_ops,
161				max8925_onkey_suspend, max8925_onkey_resume);
162
163static struct platform_driver max8925_onkey_driver = {
164	.driver		= {
165		.name	= "max8925-onkey",
166		.pm	= pm_sleep_ptr(&max8925_onkey_pm_ops),
167	},
168	.probe		= max8925_onkey_probe,
169};
170module_platform_driver(max8925_onkey_driver);
171
172MODULE_DESCRIPTION("Maxim MAX8925 ONKEY driver");
173MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
174MODULE_LICENSE("GPL");
175