1 | /* |
2 | * 88pm860x_onkey.c - Marvell 88PM860x ONKEY driver |
3 | * |
4 | * Copyright (C) 2009-2010 Marvell International Ltd. |
5 | * Haojian Zhuang <haojian.zhuang@marvell.com> |
6 | * |
7 | * This file is subject to the terms and conditions of the GNU General |
8 | * Public License. See the file "COPYING" in the main directory of this |
9 | * archive for more details. |
10 | * |
11 | * This program is distributed in the hope that it will be useful, |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | * GNU General Public License for more details. |
15 | * |
16 | * You should have received a copy of the GNU General Public License |
17 | * along with this program; if not, write to the Free Software |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
19 | */ |
20 | |
21 | #include <linux/kernel.h> |
22 | #include <linux/module.h> |
23 | #include <linux/platform_device.h> |
24 | #include <linux/i2c.h> |
25 | #include <linux/input.h> |
26 | #include <linux/interrupt.h> |
27 | #include <linux/mfd/88pm860x.h> |
28 | #include <linux/slab.h> |
29 | #include <linux/device.h> |
30 | |
31 | #define PM8607_WAKEUP 0x0b |
32 | |
33 | #define LONG_ONKEY_EN (1 << 1) |
34 | #define ONKEY_STATUS (1 << 0) |
35 | |
36 | struct pm860x_onkey_info { |
37 | struct input_dev *idev; |
38 | struct pm860x_chip *chip; |
39 | struct i2c_client *i2c; |
40 | struct device *dev; |
41 | int irq; |
42 | }; |
43 | |
44 | /* 88PM860x gives us an interrupt when ONKEY is held */ |
45 | static irqreturn_t pm860x_onkey_handler(int irq, void *data) |
46 | { |
47 | struct pm860x_onkey_info *info = data; |
48 | int ret; |
49 | |
50 | ret = pm860x_reg_read(info->i2c, PM8607_STATUS_2); |
51 | ret &= ONKEY_STATUS; |
52 | input_report_key(dev: info->idev, KEY_POWER, value: ret); |
53 | input_sync(dev: info->idev); |
54 | |
55 | /* Enable 8-second long onkey detection */ |
56 | pm860x_set_bits(info->i2c, PM8607_WAKEUP, 3, LONG_ONKEY_EN); |
57 | return IRQ_HANDLED; |
58 | } |
59 | |
60 | static int pm860x_onkey_probe(struct platform_device *pdev) |
61 | { |
62 | struct pm860x_chip *chip = dev_get_drvdata(dev: pdev->dev.parent); |
63 | struct pm860x_onkey_info *info; |
64 | int irq, ret; |
65 | |
66 | irq = platform_get_irq(pdev, 0); |
67 | if (irq < 0) |
68 | return -EINVAL; |
69 | |
70 | info = devm_kzalloc(dev: &pdev->dev, size: sizeof(struct pm860x_onkey_info), |
71 | GFP_KERNEL); |
72 | if (!info) |
73 | return -ENOMEM; |
74 | info->chip = chip; |
75 | info->i2c = (chip->id == CHIP_PM8607) ? chip->client : chip->companion; |
76 | info->dev = &pdev->dev; |
77 | info->irq = irq; |
78 | |
79 | info->idev = devm_input_allocate_device(&pdev->dev); |
80 | if (!info->idev) { |
81 | dev_err(chip->dev, "Failed to allocate input dev\n" ); |
82 | return -ENOMEM; |
83 | } |
84 | |
85 | info->idev->name = "88pm860x_on" ; |
86 | info->idev->phys = "88pm860x_on/input0" ; |
87 | info->idev->id.bustype = BUS_I2C; |
88 | info->idev->dev.parent = &pdev->dev; |
89 | info->idev->evbit[0] = BIT_MASK(EV_KEY); |
90 | info->idev->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER); |
91 | |
92 | ret = input_register_device(info->idev); |
93 | if (ret) { |
94 | dev_err(chip->dev, "Can't register input device: %d\n" , ret); |
95 | return ret; |
96 | } |
97 | |
98 | ret = devm_request_threaded_irq(dev: &pdev->dev, irq: info->irq, NULL, |
99 | thread_fn: pm860x_onkey_handler, IRQF_ONESHOT, |
100 | devname: "onkey" , dev_id: info); |
101 | if (ret < 0) { |
102 | dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n" , |
103 | info->irq, ret); |
104 | return ret; |
105 | } |
106 | |
107 | platform_set_drvdata(pdev, data: info); |
108 | device_init_wakeup(dev: &pdev->dev, enable: 1); |
109 | |
110 | return 0; |
111 | } |
112 | |
113 | static int pm860x_onkey_suspend(struct device *dev) |
114 | { |
115 | struct platform_device *pdev = to_platform_device(dev); |
116 | struct pm860x_chip *chip = dev_get_drvdata(dev: pdev->dev.parent); |
117 | |
118 | if (device_may_wakeup(dev)) |
119 | chip->wakeup_flag |= 1 << PM8607_IRQ_ONKEY; |
120 | return 0; |
121 | } |
122 | static int pm860x_onkey_resume(struct device *dev) |
123 | { |
124 | struct platform_device *pdev = to_platform_device(dev); |
125 | struct pm860x_chip *chip = dev_get_drvdata(dev: pdev->dev.parent); |
126 | |
127 | if (device_may_wakeup(dev)) |
128 | chip->wakeup_flag &= ~(1 << PM8607_IRQ_ONKEY); |
129 | return 0; |
130 | } |
131 | |
132 | static DEFINE_SIMPLE_DEV_PM_OPS(pm860x_onkey_pm_ops, |
133 | pm860x_onkey_suspend, pm860x_onkey_resume); |
134 | |
135 | static struct platform_driver pm860x_onkey_driver = { |
136 | .driver = { |
137 | .name = "88pm860x-onkey" , |
138 | .pm = pm_sleep_ptr(&pm860x_onkey_pm_ops), |
139 | }, |
140 | .probe = pm860x_onkey_probe, |
141 | }; |
142 | module_platform_driver(pm860x_onkey_driver); |
143 | |
144 | MODULE_DESCRIPTION("Marvell 88PM860x ONKEY driver" ); |
145 | MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>" ); |
146 | MODULE_LICENSE("GPL" ); |
147 | |