4 * Copyright (C) 2009 Marvell International Ltd.
5 * Haojian Zhuang <haojian.zhuang@marvell.com>
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.
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.
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
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>
30 #define SW_INPUT (1 << 7) /* 0/1 -- up/down */
31 #define HARDRESET_EN (1 << 7)
32 #define PWREN_EN (1 << 7)
34 struct max8925_onkey_info {
35 struct input_dev *idev;
36 struct i2c_client *i2c;
42 * MAX8925 gives us an interrupt when ONKEY is pressed or released.
43 * max8925_set_bits() operates I2C bus and may sleep. So implement
44 * it in thread IRQ handler.
46 static irqreturn_t max8925_onkey_handler(int irq, void *data)
48 struct max8925_onkey_info *info = data;
51 state = max8925_reg_read(info->i2c, MAX8925_ON_OFF_STATUS);
53 input_report_key(info->idev, KEY_POWER, state & SW_INPUT);
54 input_sync(info->idev);
56 dev_dbg(info->dev, "onkey state:%d\n", state);
58 /* Enable hardreset to halt if system isn't shutdown on time */
59 max8925_set_bits(info->i2c, MAX8925_SYSENSEL,
60 HARDRESET_EN, HARDRESET_EN);
65 static int __devinit max8925_onkey_probe(struct platform_device *pdev)
67 struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
68 struct max8925_onkey_info *info;
69 struct input_dev *input;
72 irq[0] = platform_get_irq(pdev, 0);
74 dev_err(&pdev->dev, "No IRQ resource!\n");
78 irq[1] = platform_get_irq(pdev, 1);
80 dev_err(&pdev->dev, "No IRQ resource!\n");
84 info = kzalloc(sizeof(struct max8925_onkey_info), GFP_KERNEL);
85 input = input_allocate_device();
86 if (!info || !input) {
92 info->i2c = chip->i2c;
93 info->dev = &pdev->dev;
94 info->irq[0] = irq[0];
95 info->irq[1] = irq[1];
97 input->name = "max8925_on";
98 input->phys = "max8925_on/input0";
99 input->id.bustype = BUS_I2C;
100 input->dev.parent = &pdev->dev;
101 input_set_capability(input, EV_KEY, KEY_POWER);
103 irq[0] += chip->irq_base;
104 irq[1] += chip->irq_base;
106 error = request_threaded_irq(irq[0], NULL, max8925_onkey_handler,
107 IRQF_ONESHOT, "onkey-down", info);
109 dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
114 error = request_threaded_irq(irq[1], NULL, max8925_onkey_handler,
115 IRQF_ONESHOT, "onkey-up", info);
117 dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
122 error = input_register_device(info->idev);
124 dev_err(chip->dev, "Can't register input device: %d\n", error);
128 platform_set_drvdata(pdev, info);
129 device_init_wakeup(&pdev->dev, 1);
134 free_irq(irq[1], info);
136 free_irq(irq[0], info);
138 input_free_device(input);
144 static int __devexit max8925_onkey_remove(struct platform_device *pdev)
146 struct max8925_onkey_info *info = platform_get_drvdata(pdev);
147 struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
149 free_irq(info->irq[0] + chip->irq_base, info);
150 free_irq(info->irq[1] + chip->irq_base, info);
151 input_unregister_device(info->idev);
154 platform_set_drvdata(pdev, NULL);
159 #ifdef CONFIG_PM_SLEEP
160 static int max8925_onkey_suspend(struct device *dev)
162 struct platform_device *pdev = to_platform_device(dev);
163 struct max8925_onkey_info *info = platform_get_drvdata(pdev);
164 struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
166 if (device_may_wakeup(dev)) {
167 chip->wakeup_flag |= 1 << info->irq[0];
168 chip->wakeup_flag |= 1 << info->irq[1];
174 static int max8925_onkey_resume(struct device *dev)
176 struct platform_device *pdev = to_platform_device(dev);
177 struct max8925_onkey_info *info = platform_get_drvdata(pdev);
178 struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
180 if (device_may_wakeup(dev)) {
181 chip->wakeup_flag &= ~(1 << info->irq[0]);
182 chip->wakeup_flag &= ~(1 << info->irq[1]);
189 static SIMPLE_DEV_PM_OPS(max8925_onkey_pm_ops, max8925_onkey_suspend, max8925_onkey_resume);
191 static struct platform_driver max8925_onkey_driver = {
193 .name = "max8925-onkey",
194 .owner = THIS_MODULE,
195 .pm = &max8925_onkey_pm_ops,
197 .probe = max8925_onkey_probe,
198 .remove = max8925_onkey_remove,
200 module_platform_driver(max8925_onkey_driver);
202 MODULE_DESCRIPTION("Maxim MAX8925 ONKEY driver");
203 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
204 MODULE_LICENSE("GPL");