1 | /* |
2 | * MAX8925 ONKEY driver |
3 | * |
4 | * Copyright (C) 2009 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/max8925.h> |
28 | #include <linux/slab.h> |
29 | #include <linux/device.h> |
30 | |
31 | #define SW_INPUT (1 << 7) /* 0/1 -- up/down */ |
32 | #define HARDRESET_EN (1 << 7) |
33 | #define PWREN_EN (1 << 7) |
34 | |
35 | struct max8925_onkey_info { |
36 | struct input_dev *idev; |
37 | struct i2c_client *i2c; |
38 | struct device *dev; |
39 | unsigned int irq[2]; |
40 | }; |
41 | |
42 | /* |
43 | * MAX8925 gives us an interrupt when ONKEY is pressed or released. |
44 | * max8925_set_bits() operates I2C bus and may sleep. So implement |
45 | * it in thread IRQ handler. |
46 | */ |
47 | static irqreturn_t max8925_onkey_handler(int irq, void *data) |
48 | { |
49 | struct max8925_onkey_info *info = data; |
50 | int state; |
51 | |
52 | state = max8925_reg_read(info->i2c, MAX8925_ON_OFF_STATUS); |
53 | |
54 | input_report_key(dev: info->idev, KEY_POWER, value: state & SW_INPUT); |
55 | input_sync(dev: info->idev); |
56 | |
57 | dev_dbg(info->dev, "onkey state:%d\n" , state); |
58 | |
59 | /* Enable hardreset to halt if system isn't shutdown on time */ |
60 | max8925_set_bits(info->i2c, MAX8925_SYSENSEL, |
61 | HARDRESET_EN, HARDRESET_EN); |
62 | |
63 | return IRQ_HANDLED; |
64 | } |
65 | |
66 | static int max8925_onkey_probe(struct platform_device *pdev) |
67 | { |
68 | struct max8925_chip *chip = dev_get_drvdata(dev: pdev->dev.parent); |
69 | struct max8925_onkey_info *info; |
70 | struct input_dev *input; |
71 | int irq[2], error; |
72 | |
73 | irq[0] = platform_get_irq(pdev, 0); |
74 | if (irq[0] < 0) |
75 | return -EINVAL; |
76 | |
77 | irq[1] = platform_get_irq(pdev, 1); |
78 | if (irq[1] < 0) |
79 | return -EINVAL; |
80 | |
81 | info = devm_kzalloc(dev: &pdev->dev, size: sizeof(struct max8925_onkey_info), |
82 | GFP_KERNEL); |
83 | if (!info) |
84 | return -ENOMEM; |
85 | |
86 | input = devm_input_allocate_device(&pdev->dev); |
87 | if (!input) |
88 | return -ENOMEM; |
89 | |
90 | info->idev = input; |
91 | info->i2c = chip->i2c; |
92 | info->dev = &pdev->dev; |
93 | info->irq[0] = irq[0]; |
94 | info->irq[1] = irq[1]; |
95 | |
96 | input->name = "max8925_on" ; |
97 | input->phys = "max8925_on/input0" ; |
98 | input->id.bustype = BUS_I2C; |
99 | input->dev.parent = &pdev->dev; |
100 | input_set_capability(dev: input, EV_KEY, KEY_POWER); |
101 | |
102 | error = devm_request_threaded_irq(dev: &pdev->dev, irq: irq[0], NULL, |
103 | thread_fn: max8925_onkey_handler, IRQF_ONESHOT, |
104 | devname: "onkey-down" , dev_id: info); |
105 | if (error < 0) { |
106 | dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n" , |
107 | irq[0], error); |
108 | return error; |
109 | } |
110 | |
111 | error = devm_request_threaded_irq(dev: &pdev->dev, irq: irq[1], NULL, |
112 | thread_fn: max8925_onkey_handler, IRQF_ONESHOT, |
113 | devname: "onkey-up" , dev_id: info); |
114 | if (error < 0) { |
115 | dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n" , |
116 | irq[1], error); |
117 | return error; |
118 | } |
119 | |
120 | error = input_register_device(info->idev); |
121 | if (error) { |
122 | dev_err(chip->dev, "Can't register input device: %d\n" , error); |
123 | return error; |
124 | } |
125 | |
126 | platform_set_drvdata(pdev, data: info); |
127 | device_init_wakeup(dev: &pdev->dev, enable: 1); |
128 | |
129 | return 0; |
130 | } |
131 | |
132 | static int max8925_onkey_suspend(struct device *dev) |
133 | { |
134 | struct platform_device *pdev = to_platform_device(dev); |
135 | struct max8925_onkey_info *info = platform_get_drvdata(pdev); |
136 | struct max8925_chip *chip = dev_get_drvdata(dev: pdev->dev.parent); |
137 | |
138 | if (device_may_wakeup(dev)) { |
139 | chip->wakeup_flag |= 1 << info->irq[0]; |
140 | chip->wakeup_flag |= 1 << info->irq[1]; |
141 | } |
142 | |
143 | return 0; |
144 | } |
145 | |
146 | static int max8925_onkey_resume(struct device *dev) |
147 | { |
148 | struct platform_device *pdev = to_platform_device(dev); |
149 | struct max8925_onkey_info *info = platform_get_drvdata(pdev); |
150 | struct max8925_chip *chip = dev_get_drvdata(dev: pdev->dev.parent); |
151 | |
152 | if (device_may_wakeup(dev)) { |
153 | chip->wakeup_flag &= ~(1 << info->irq[0]); |
154 | chip->wakeup_flag &= ~(1 << info->irq[1]); |
155 | } |
156 | |
157 | return 0; |
158 | } |
159 | |
160 | static DEFINE_SIMPLE_DEV_PM_OPS(max8925_onkey_pm_ops, |
161 | max8925_onkey_suspend, max8925_onkey_resume); |
162 | |
163 | static struct platform_driver max8925_onkey_driver = { |
164 | .driver = { |
165 | .name = "max8925-onkey" , |
166 | .pm = pm_sleep_ptr(&max8925_onkey_pm_ops), |
167 | }, |
168 | .probe = max8925_onkey_probe, |
169 | }; |
170 | module_platform_driver(max8925_onkey_driver); |
171 | |
172 | MODULE_DESCRIPTION("Maxim MAX8925 ONKEY driver" ); |
173 | MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>" ); |
174 | MODULE_LICENSE("GPL" ); |
175 | |