2 * drivers/i2c/chips/twl4030-pwrbutton.c
4 * Driver for sending triton2 power button event to input-layer
6 * Copyright (C) 2008 Nokia Corporation
8 * Written by Peter De Schrijver <peter.de-schrijver@nokia.com>
10 * This file is subject to the terms and conditions of the GNU General
11 * Public License. See the file "COPYING" in the main directory of this
12 * archive for more details.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 #include <linux/module.h>
25 #include <linux/init.h>
26 #include <linux/kernel.h>
27 #include <linux/errno.h>
28 #include <linux/input.h>
29 #include <linux/timer.h>
30 #include <linux/jiffies.h>
31 #include <linux/kthread.h>
32 #include <linux/interrupt.h>
33 #include <linux/i2c/twl4030.h>
37 #define PWR_PWRON_IRQ (1<<0)
40 #define PWR_PWRON_RISING (1<<1)
41 #define PWR_PWRON_FALLING (1<<0)
42 #define PWR_PWRON_BOTH (PWR_PWRON_RISING | PWR_PWRON_FALLING)
44 #define PWR_SIH_CTRL 7
46 #define STS_HW_CONDITIONS 0xf
48 static struct input_dev *powerbutton_dev;
51 * Note : the following function runs in kernel thread context
55 static irqreturn_t powerbutton_irq(int irq, void *dev_id)
60 err = twl4030_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &value,
63 input_report_key(powerbutton_dev, KEY_POWER,
64 value & PWR_PWRON_IRQ);
66 printk(KERN_WARNING "I2C error %d while reading TWL4030"
67 "PM_MASTER STS_HW_CONDITIONS register\n", err);
73 static int __init twl4030_pwrbutton_init(void)
78 if (request_irq(TWL4030_PWRIRQ_PWRBTN, powerbutton_irq, 0,
79 "PwrButton", NULL) < 0) {
80 printk(KERN_ERR "Unable to allocate IRQ for power button\n");
85 powerbutton_dev = input_allocate_device();
86 if (!powerbutton_dev) {
88 "Unable to allocate input device for power button\n");
90 goto free_irq_and_out;
93 powerbutton_dev->evbit[0] = BIT_MASK(EV_KEY);
94 powerbutton_dev->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);
95 powerbutton_dev->name = "triton2-pwrbutton";
97 err = input_register_device(powerbutton_dev);
101 err = twl4030_i2c_read_u8(TWL4030_MODULE_INT, &value, PWR_IMR1);
103 printk(KERN_WARNING "I2C error %d while reading TWL4030"
104 "INT PWR_IMR1 register\n", err);
109 err = twl4030_i2c_write_u8(TWL4030_MODULE_INT,
110 value & (~PWR_PWRON_IRQ), PWR_IMR1);
112 printk(KERN_WARNING "I2C error %d while writing TWL4030"
113 "INT PWR_IMR1 register\n", err);
117 err = twl4030_i2c_read_u8(TWL4030_MODULE_INT, &value, PWR_EDR1);
119 printk(KERN_WARNING "I2C error %d while reading TWL4030"
120 "INT PWR_EDR1 register\n", err);
124 err = twl4030_i2c_write_u8(TWL4030_MODULE_INT,
125 value | PWR_PWRON_BOTH , PWR_EDR1);
128 printk(KERN_WARNING "I2C error %d while writing TWL4030"
129 "INT PWR_EDR1 register\n", err);
133 printk(KERN_INFO "triton2 power button driver initialized\n");
139 input_free_device(powerbutton_dev);
141 free_irq(TWL4030_PWRIRQ_PWRBTN, NULL);
146 static void __exit twl4030_pwrbutton_exit(void)
148 free_irq(TWL4030_PWRIRQ_PWRBTN, NULL);
149 input_unregister_device(powerbutton_dev);
150 input_free_device(powerbutton_dev);
154 module_init(twl4030_pwrbutton_init);
155 module_exit(twl4030_pwrbutton_exit);
157 MODULE_DESCRIPTION("Triton2 Power Button");
158 MODULE_LICENSE("GPL");
159 MODULE_AUTHOR("Peter De Schrijver");