1/*
2 * Marvell 88PM80x ONKEY driver
3 *
4 * Copyright (C) 2012 Marvell International Ltd.
5 * Haojian Zhuang <haojian.zhuang@marvell.com>
6 * Qiao Zhou <zhouqiao@marvell.com>
7 *
8 * This file is subject to the terms and conditions of the GNU General
9 * Public License. See the file "COPYING" in the main directory of this
10 * archive for more details.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
22#include <linux/kernel.h>
23#include <linux/module.h>
24#include <linux/input.h>
25#include <linux/mfd/88pm80x.h>
26#include <linux/regmap.h>
27#include <linux/slab.h>
28
29#define PM800_LONG_ONKEY_EN (1 << 0)
30#define PM800_LONG_KEY_DELAY (8) /* 1 .. 16 seconds */
31#define PM800_LONKEY_PRESS_TIME ((PM800_LONG_KEY_DELAY-1) << 4)
32#define PM800_LONKEY_PRESS_TIME_MASK (0xF0)
33#define PM800_SW_PDOWN (1 << 5)
34
35struct pm80x_onkey_info {
36 struct input_dev *idev;
37 struct pm80x_chip *pm80x;
38 struct regmap *map;
39 int irq;
40};
41
42/* 88PM80x gives us an interrupt when ONKEY is held */
43static irqreturn_t pm80x_onkey_handler(int irq, void *data)
44{
45 struct pm80x_onkey_info *info = data;
46 int ret = 0;
47 unsigned int val;
48
49 ret = regmap_read(info->map, PM800_STATUS_1, &val);
50 if (ret < 0) {
51 dev_err(info->idev->dev.parent, "failed to read status: %d\n", ret);
52 return IRQ_NONE;
53 }
54 val &= PM800_ONKEY_STS1;
55
56 input_report_key(info->idev, KEY_POWER, val);
57 input_sync(info->idev);
58
59 return IRQ_HANDLED;
60}
61
62static SIMPLE_DEV_PM_OPS(pm80x_onkey_pm_ops, pm80x_dev_suspend,
63 pm80x_dev_resume);
64
65static int pm80x_onkey_probe(struct platform_device *pdev)
66{
67
68 struct pm80x_chip *chip = dev_get_drvdata(pdev->dev.parent);
69 struct pm80x_onkey_info *info;
70 int err;
71
72 info = kzalloc(sizeof(struct pm80x_onkey_info), GFP_KERNEL);
73 if (!info)
74 return -ENOMEM;
75
76 info->pm80x = chip;
77
78 info->irq = platform_get_irq(pdev, 0);
79 if (info->irq < 0) {
80 dev_err(&pdev->dev, "No IRQ resource!\n");
81 err = -EINVAL;
82 goto out;
83 }
84
85 info->map = info->pm80x->regmap;
86 if (!info->map) {
87 dev_err(&pdev->dev, "no regmap!\n");
88 err = -EINVAL;
89 goto out;
90 }
91
92 info->idev = input_allocate_device();
93 if (!info->idev) {
94 dev_err(&pdev->dev, "Failed to allocate input dev\n");
95 err = -ENOMEM;
96 goto out;
97 }
98
99 info->idev->name = "88pm80x_on";
100 info->idev->phys = "88pm80x_on/input0";
101 info->idev->id.bustype = BUS_I2C;
102 info->idev->dev.parent = &pdev->dev;
103 info->idev->evbit[0] = BIT_MASK(EV_KEY);
104 __set_bit(KEY_POWER, info->idev->keybit);
105
106 err = pm80x_request_irq(info->pm80x, info->irq, pm80x_onkey_handler,
107 IRQF_ONESHOT, "onkey", info);
108 if (err < 0) {
109 dev_err(&pdev->dev, "Failed to request IRQ: #%d: %d\n",
110 info->irq, err);
111 goto out_reg;
112 }
113
114 err = input_register_device(info->idev);
115 if (err) {
116 dev_err(&pdev->dev, "Can't register input device: %d\n", err);
117 goto out_irq;
118 }
119
120 platform_set_drvdata(pdev, info);
121
122 /* Enable long onkey detection */
123 regmap_update_bits(info->map, PM800_RTC_MISC4, PM800_LONG_ONKEY_EN,
124 PM800_LONG_ONKEY_EN);
125 /* Set 8-second interval */
126 regmap_update_bits(info->map, PM800_RTC_MISC3,
127 PM800_LONKEY_PRESS_TIME_MASK,
128 PM800_LONKEY_PRESS_TIME);
129
130 device_init_wakeup(&pdev->dev, 1);
131 return 0;
132
133out_irq:
134 pm80x_free_irq(info->pm80x, info->irq, info);
135out_reg:
136 input_free_device(info->idev);
137out:
138 kfree(info);
139 return err;
140}
141
142static int pm80x_onkey_remove(struct platform_device *pdev)
143{
144 struct pm80x_onkey_info *info = platform_get_drvdata(pdev);
145
146 pm80x_free_irq(info->pm80x, info->irq, info);
147 input_unregister_device(info->idev);
148 kfree(info);
149 return 0;
150}
151
152static struct platform_driver pm80x_onkey_driver = {
153 .driver = {
154 .name = "88pm80x-onkey",
155 .pm = &pm80x_onkey_pm_ops,
156 },
157 .probe = pm80x_onkey_probe,
158 .remove = pm80x_onkey_remove,
159};
160
161module_platform_driver(pm80x_onkey_driver);
162
163MODULE_LICENSE("GPL");
164MODULE_DESCRIPTION("Marvell 88PM80x ONKEY driver");
165MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>");
166MODULE_ALIAS("platform:88pm80x-onkey");
167