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/interrupt.h>
30 #include <linux/i2c/twl4030.h>
34 #define PWR_PWRON_IRQ (1<<0)
37 #define PWR_PWRON_RISING (1<<1)
38 #define PWR_PWRON_FALLING (1<<0)
39 #define PWR_PWRON_BOTH (PWR_PWRON_RISING | PWR_PWRON_FALLING)
41 #define PWR_SIH_CTRL 7
43 #define STS_HW_CONDITIONS 0xf
45 static struct input_dev *powerbutton_dev;
47 static irqreturn_t powerbutton_irq(int irq, void *dev_id)
53 /* WORKAROUND for lockdep forcing IRQF_DISABLED on us, which
54 * we don't want and can't tolerate. Although it might be
55 * friendlier not to borrow this thread context...
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 pr_err("twl4030: i2c error %d while reading TWL4030"
67 " PM_MASTER STS_HW_CONDITIONS register\n", err);
73 static int __init twl4030_pwrbutton_init(void)
79 if (request_irq(TWL4030_PWRIRQ_PWRBTN, powerbutton_irq, 0,
80 "PwrButton", NULL) < 0) {
81 printk(KERN_ERR "Unable to allocate IRQ for power button\n");
86 powerbutton_dev = input_allocate_device();
87 if (!powerbutton_dev) {
89 "Unable to allocate input device for power button\n");
91 goto free_irq_and_out;
94 powerbutton_dev->evbit[0] = BIT_MASK(EV_KEY);
95 powerbutton_dev->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);
96 powerbutton_dev->name = "triton2-pwrbutton";
98 err = input_register_device(powerbutton_dev);
100 input_free_device(powerbutton_dev);
101 goto free_irq_and_out;
104 /* FIXME just pass IRQF_EDGE_FALLING | IRQF_EDGE_RISING
105 * to request_irq(), once MODULE_INT supports them...
107 err = twl4030_i2c_read_u8(TWL4030_MODULE_INT, &value, PWR_EDR1);
109 printk(KERN_WARNING "I2C error %d while reading TWL4030"
110 " INT PWR_EDR1 register\n", err);
114 err = twl4030_i2c_write_u8(TWL4030_MODULE_INT,
115 value | PWR_PWRON_BOTH, PWR_EDR1);
118 printk(KERN_WARNING "I2C error %d while writing TWL4030"
119 " INT PWR_EDR1 register\n", err);
123 printk(KERN_INFO "triton2 power button driver initialized\n");
129 input_unregister_device(powerbutton_dev);
131 free_irq(TWL4030_PWRIRQ_PWRBTN, NULL);
135 module_init(twl4030_pwrbutton_init);
137 static void __exit twl4030_pwrbutton_exit(void)
139 free_irq(TWL4030_PWRIRQ_PWRBTN, NULL);
140 input_unregister_device(powerbutton_dev);
141 input_free_device(powerbutton_dev);
143 module_exit(twl4030_pwrbutton_exit);
145 MODULE_DESCRIPTION("Triton2 Power Button");
146 MODULE_LICENSE("GPL");
147 MODULE_AUTHOR("Peter De Schrijver");