Merge git://git.kernel.org/pub/scm/linux/kernel/git/lwfinger/r8192E into staging...
[zen-stable.git] / drivers / input / misc / wm831x-on.c
blobc3d7ba5f5b47037c3b8c46b62ca7d6ad931e62db
1 /**
2 * wm831x-on.c - WM831X ON pin driver
4 * Copyright (C) 2009 Wolfson Microelectronics plc
6 * This file is subject to the terms and conditions of the GNU General
7 * Public License. See the file "COPYING" in the main directory of this
8 * archive for more details.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 #include <linux/module.h>
21 #include <linux/init.h>
22 #include <linux/slab.h>
23 #include <linux/kernel.h>
24 #include <linux/errno.h>
25 #include <linux/input.h>
26 #include <linux/interrupt.h>
27 #include <linux/platform_device.h>
28 #include <linux/workqueue.h>
29 #include <linux/mfd/wm831x/core.h>
31 struct wm831x_on {
32 struct input_dev *dev;
33 struct delayed_work work;
34 struct wm831x *wm831x;
38 * The chip gives us an interrupt when the ON pin is asserted but we
39 * then need to poll to see when the pin is deasserted.
41 static void wm831x_poll_on(struct work_struct *work)
43 struct wm831x_on *wm831x_on = container_of(work, struct wm831x_on,
44 work.work);
45 struct wm831x *wm831x = wm831x_on->wm831x;
46 int poll, ret;
48 ret = wm831x_reg_read(wm831x, WM831X_ON_PIN_CONTROL);
49 if (ret >= 0) {
50 poll = !(ret & WM831X_ON_PIN_STS);
52 input_report_key(wm831x_on->dev, KEY_POWER, poll);
53 input_sync(wm831x_on->dev);
54 } else {
55 dev_err(wm831x->dev, "Failed to read ON status: %d\n", ret);
56 poll = 1;
59 if (poll)
60 schedule_delayed_work(&wm831x_on->work, 100);
63 static irqreturn_t wm831x_on_irq(int irq, void *data)
65 struct wm831x_on *wm831x_on = data;
67 schedule_delayed_work(&wm831x_on->work, 0);
69 return IRQ_HANDLED;
72 static int __devinit wm831x_on_probe(struct platform_device *pdev)
74 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
75 struct wm831x_on *wm831x_on;
76 int irq = platform_get_irq(pdev, 0);
77 int ret;
79 wm831x_on = kzalloc(sizeof(struct wm831x_on), GFP_KERNEL);
80 if (!wm831x_on) {
81 dev_err(&pdev->dev, "Can't allocate data\n");
82 return -ENOMEM;
85 wm831x_on->wm831x = wm831x;
86 INIT_DELAYED_WORK(&wm831x_on->work, wm831x_poll_on);
88 wm831x_on->dev = input_allocate_device();
89 if (!wm831x_on->dev) {
90 dev_err(&pdev->dev, "Can't allocate input dev\n");
91 ret = -ENOMEM;
92 goto err;
95 wm831x_on->dev->evbit[0] = BIT_MASK(EV_KEY);
96 wm831x_on->dev->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);
97 wm831x_on->dev->name = "wm831x_on";
98 wm831x_on->dev->phys = "wm831x_on/input0";
99 wm831x_on->dev->dev.parent = &pdev->dev;
101 ret = request_threaded_irq(irq, NULL, wm831x_on_irq,
102 IRQF_TRIGGER_RISING, "wm831x_on",
103 wm831x_on);
104 if (ret < 0) {
105 dev_err(&pdev->dev, "Unable to request IRQ: %d\n", ret);
106 goto err_input_dev;
108 ret = input_register_device(wm831x_on->dev);
109 if (ret) {
110 dev_dbg(&pdev->dev, "Can't register input device: %d\n", ret);
111 goto err_irq;
114 platform_set_drvdata(pdev, wm831x_on);
116 return 0;
118 err_irq:
119 free_irq(irq, wm831x_on);
120 err_input_dev:
121 input_free_device(wm831x_on->dev);
122 err:
123 kfree(wm831x_on);
124 return ret;
127 static int __devexit wm831x_on_remove(struct platform_device *pdev)
129 struct wm831x_on *wm831x_on = platform_get_drvdata(pdev);
130 int irq = platform_get_irq(pdev, 0);
132 free_irq(irq, wm831x_on);
133 cancel_delayed_work_sync(&wm831x_on->work);
134 input_unregister_device(wm831x_on->dev);
135 kfree(wm831x_on);
137 return 0;
140 static struct platform_driver wm831x_on_driver = {
141 .probe = wm831x_on_probe,
142 .remove = __devexit_p(wm831x_on_remove),
143 .driver = {
144 .name = "wm831x-on",
145 .owner = THIS_MODULE,
149 static int __init wm831x_on_init(void)
151 return platform_driver_register(&wm831x_on_driver);
153 module_init(wm831x_on_init);
155 static void __exit wm831x_on_exit(void)
157 platform_driver_unregister(&wm831x_on_driver);
159 module_exit(wm831x_on_exit);
161 MODULE_ALIAS("platform:wm831x-on");
162 MODULE_DESCRIPTION("WM831x ON pin");
163 MODULE_LICENSE("GPL");
164 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");