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
35 struct 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 */
pm80x_onkey_handler(int irq,void * data)43 static 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
62 static SIMPLE_DEV_PM_OPS(pm80x_onkey_pm_ops, pm80x_dev_suspend,
63 pm80x_dev_resume);
64
pm80x_onkey_probe(struct platform_device * pdev)65 static 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 err = -EINVAL;
81 goto out;
82 }
83
84 info->map = info->pm80x->regmap;
85 if (!info->map) {
86 dev_err(&pdev->dev, "no regmap!\n");
87 err = -EINVAL;
88 goto out;
89 }
90
91 info->idev = input_allocate_device();
92 if (!info->idev) {
93 dev_err(&pdev->dev, "Failed to allocate input dev\n");
94 err = -ENOMEM;
95 goto out;
96 }
97
98 info->idev->name = "88pm80x_on";
99 info->idev->phys = "88pm80x_on/input0";
100 info->idev->id.bustype = BUS_I2C;
101 info->idev->dev.parent = &pdev->dev;
102 info->idev->evbit[0] = BIT_MASK(EV_KEY);
103 __set_bit(KEY_POWER, info->idev->keybit);
104
105 err = pm80x_request_irq(info->pm80x, info->irq, pm80x_onkey_handler,
106 IRQF_ONESHOT, "onkey", info);
107 if (err < 0) {
108 dev_err(&pdev->dev, "Failed to request IRQ: #%d: %d\n",
109 info->irq, err);
110 goto out_reg;
111 }
112
113 err = input_register_device(info->idev);
114 if (err) {
115 dev_err(&pdev->dev, "Can't register input device: %d\n", err);
116 goto out_irq;
117 }
118
119 platform_set_drvdata(pdev, info);
120
121 /* Enable long onkey detection */
122 regmap_update_bits(info->map, PM800_RTC_MISC4, PM800_LONG_ONKEY_EN,
123 PM800_LONG_ONKEY_EN);
124 /* Set 8-second interval */
125 regmap_update_bits(info->map, PM800_RTC_MISC3,
126 PM800_LONKEY_PRESS_TIME_MASK,
127 PM800_LONKEY_PRESS_TIME);
128
129 device_init_wakeup(&pdev->dev, 1);
130 return 0;
131
132 out_irq:
133 pm80x_free_irq(info->pm80x, info->irq, info);
134 out_reg:
135 input_free_device(info->idev);
136 out:
137 kfree(info);
138 return err;
139 }
140
pm80x_onkey_remove(struct platform_device * pdev)141 static int pm80x_onkey_remove(struct platform_device *pdev)
142 {
143 struct pm80x_onkey_info *info = platform_get_drvdata(pdev);
144
145 pm80x_free_irq(info->pm80x, info->irq, info);
146 input_unregister_device(info->idev);
147 kfree(info);
148 return 0;
149 }
150
151 static struct platform_driver pm80x_onkey_driver = {
152 .driver = {
153 .name = "88pm80x-onkey",
154 .pm = &pm80x_onkey_pm_ops,
155 },
156 .probe = pm80x_onkey_probe,
157 .remove = pm80x_onkey_remove,
158 };
159
160 module_platform_driver(pm80x_onkey_driver);
161
162 MODULE_LICENSE("GPL");
163 MODULE_DESCRIPTION("Marvell 88PM80x ONKEY driver");
164 MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>");
165 MODULE_ALIAS("platform:88pm80x-onkey");
166