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Commit | Line | Data |
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3734574c | 1 | /** |
104a5f3c | 2 | * MAX8925 ONKEY driver |
3734574c HZ |
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> | |
04115e41 | 29 | #include <linux/device.h> |
3734574c | 30 | |
2d95ae3b | 31 | #define SW_INPUT (1 << 7) /* 0/1 -- up/down */ |
3734574c HZ |
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; | |
2d95ae3b | 38 | struct device *dev; |
104a5f3c | 39 | unsigned int irq[2]; |
3734574c HZ |
40 | }; |
41 | ||
42 | /* | |
2d95ae3b | 43 | * MAX8925 gives us an interrupt when ONKEY is pressed or released. |
3734574c HZ |
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; | |
104a5f3c DT |
50 | int state; |
51 | ||
52 | state = max8925_reg_read(info->i2c, MAX8925_ON_OFF_STATUS); | |
53 | ||
54 | input_report_key(info->idev, KEY_POWER, state & SW_INPUT); | |
3734574c HZ |
55 | input_sync(info->idev); |
56 | ||
104a5f3c | 57 | dev_dbg(info->dev, "onkey state:%d\n", state); |
2d95ae3b | 58 | |
3734574c HZ |
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 | ||
5298cc4c | 66 | static int max8925_onkey_probe(struct platform_device *pdev) |
3734574c HZ |
67 | { |
68 | struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); | |
69 | struct max8925_onkey_info *info; | |
104a5f3c | 70 | struct input_dev *input; |
2d95ae3b HZ |
71 | int irq[2], error; |
72 | ||
73 | irq[0] = platform_get_irq(pdev, 0); | |
74 | if (irq[0] < 0) { | |
75 | dev_err(&pdev->dev, "No IRQ resource!\n"); | |
76 | return -EINVAL; | |
77 | } | |
104a5f3c | 78 | |
2d95ae3b HZ |
79 | irq[1] = platform_get_irq(pdev, 1); |
80 | if (irq[1] < 0) { | |
81 | dev_err(&pdev->dev, "No IRQ resource!\n"); | |
82 | return -EINVAL; | |
83 | } | |
3734574c | 84 | |
04115e41 HS |
85 | info = devm_kzalloc(&pdev->dev, sizeof(struct max8925_onkey_info), |
86 | GFP_KERNEL); | |
87 | if (!info) | |
88 | return -ENOMEM; | |
89 | ||
90 | input = devm_input_allocate_device(&pdev->dev); | |
91 | if (!input) | |
92 | return -ENOMEM; | |
3734574c | 93 | |
104a5f3c | 94 | info->idev = input; |
3734574c | 95 | info->i2c = chip->i2c; |
2d95ae3b | 96 | info->dev = &pdev->dev; |
104a5f3c DT |
97 | info->irq[0] = irq[0]; |
98 | info->irq[1] = irq[1]; | |
99 | ||
100 | input->name = "max8925_on"; | |
101 | input->phys = "max8925_on/input0"; | |
102 | input->id.bustype = BUS_I2C; | |
103 | input->dev.parent = &pdev->dev; | |
104 | input_set_capability(input, EV_KEY, KEY_POWER); | |
105 | ||
04115e41 HS |
106 | error = devm_request_threaded_irq(&pdev->dev, irq[0], NULL, |
107 | max8925_onkey_handler, IRQF_ONESHOT, | |
108 | "onkey-down", info); | |
2d95ae3b HZ |
109 | if (error < 0) { |
110 | dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n", | |
111 | irq[0], error); | |
04115e41 | 112 | return error; |
2d95ae3b | 113 | } |
104a5f3c | 114 | |
04115e41 HS |
115 | error = devm_request_threaded_irq(&pdev->dev, irq[1], NULL, |
116 | max8925_onkey_handler, IRQF_ONESHOT, | |
117 | "onkey-up", info); | |
2d95ae3b HZ |
118 | if (error < 0) { |
119 | dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n", | |
120 | irq[1], error); | |
04115e41 | 121 | return error; |
2d95ae3b | 122 | } |
3734574c | 123 | |
3734574c HZ |
124 | error = input_register_device(info->idev); |
125 | if (error) { | |
126 | dev_err(chip->dev, "Can't register input device: %d\n", error); | |
04115e41 | 127 | return error; |
3734574c HZ |
128 | } |
129 | ||
130 | platform_set_drvdata(pdev, info); | |
104a5f3c | 131 | device_init_wakeup(&pdev->dev, 1); |
3734574c | 132 | |
3734574c HZ |
133 | return 0; |
134 | } | |
135 | ||
adab30d7 KL |
136 | #ifdef CONFIG_PM_SLEEP |
137 | static int max8925_onkey_suspend(struct device *dev) | |
138 | { | |
139 | struct platform_device *pdev = to_platform_device(dev); | |
140 | struct max8925_onkey_info *info = platform_get_drvdata(pdev); | |
141 | struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); | |
142 | ||
143 | if (device_may_wakeup(dev)) { | |
104a5f3c DT |
144 | chip->wakeup_flag |= 1 << info->irq[0]; |
145 | chip->wakeup_flag |= 1 << info->irq[1]; | |
adab30d7 KL |
146 | } |
147 | ||
148 | return 0; | |
149 | } | |
150 | ||
151 | static int max8925_onkey_resume(struct device *dev) | |
152 | { | |
153 | struct platform_device *pdev = to_platform_device(dev); | |
154 | struct max8925_onkey_info *info = platform_get_drvdata(pdev); | |
155 | struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); | |
156 | ||
157 | if (device_may_wakeup(dev)) { | |
104a5f3c DT |
158 | chip->wakeup_flag &= ~(1 << info->irq[0]); |
159 | chip->wakeup_flag &= ~(1 << info->irq[1]); | |
adab30d7 KL |
160 | } |
161 | ||
162 | return 0; | |
163 | } | |
164 | #endif | |
165 | ||
166 | static SIMPLE_DEV_PM_OPS(max8925_onkey_pm_ops, max8925_onkey_suspend, max8925_onkey_resume); | |
167 | ||
3734574c HZ |
168 | static struct platform_driver max8925_onkey_driver = { |
169 | .driver = { | |
170 | .name = "max8925-onkey", | |
171 | .owner = THIS_MODULE, | |
adab30d7 | 172 | .pm = &max8925_onkey_pm_ops, |
3734574c HZ |
173 | }, |
174 | .probe = max8925_onkey_probe, | |
3734574c | 175 | }; |
840a746b | 176 | module_platform_driver(max8925_onkey_driver); |
3734574c HZ |
177 | |
178 | MODULE_DESCRIPTION("Maxim MAX8925 ONKEY driver"); | |
179 | MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); | |
180 | MODULE_LICENSE("GPL"); |