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>
33 #define PWR_PWRON_IRQ (1<<0)
35 #define STS_HW_CONDITIONS 0xf
38 /* FIXME have this constant delivered to us as part of the
39 * twl4030-core setup ...
41 #define TWL4030_PWRIRQ_PWRBTN (TWL4030_PWR_IRQ_BASE + 0)
43 static struct input_dev *powerbutton_dev;
45 static irqreturn_t powerbutton_irq(int irq, void *dev_id)
51 /* WORKAROUND for lockdep forcing IRQF_DISABLED on us, which
52 * we don't want and can't tolerate. Although it might be
53 * friendlier not to borrow this thread context...
58 err = twl4030_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &value,
61 input_report_key(powerbutton_dev, KEY_POWER,
62 value & PWR_PWRON_IRQ);
64 pr_err("twl4030: i2c error %d while reading TWL4030"
65 " PM_MASTER STS_HW_CONDITIONS register\n", err);
71 static int __init twl4030_pwrbutton_init(void)
76 err = request_irq(TWL4030_PWRIRQ_PWRBTN, powerbutton_irq,
77 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
80 pr_debug("Can't get IRQ for power button: %d\n", err);
84 powerbutton_dev = input_allocate_device();
85 if (!powerbutton_dev) {
86 pr_debug("Can't allocate power button\n");
88 goto free_irq_and_out;
91 powerbutton_dev->evbit[0] = BIT_MASK(EV_KEY);
92 powerbutton_dev->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);
93 powerbutton_dev->name = "triton2-pwrbutton";
95 err = input_register_device(powerbutton_dev);
97 pr_debug("Can't register power button: %d\n", err);
101 printk(KERN_INFO "triton2 power button driver initialized\n");
107 input_free_device(powerbutton_dev);
109 free_irq(TWL4030_PWRIRQ_PWRBTN, NULL);
113 module_init(twl4030_pwrbutton_init);
115 static void __exit twl4030_pwrbutton_exit(void)
117 free_irq(TWL4030_PWRIRQ_PWRBTN, NULL);
118 input_unregister_device(powerbutton_dev);
119 input_free_device(powerbutton_dev);
121 module_exit(twl4030_pwrbutton_exit);
123 MODULE_DESCRIPTION("Triton2 Power Button");
124 MODULE_LICENSE("GPL");
125 MODULE_AUTHOR("Peter De Schrijver");