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8eec8a11 HL |
1 | /* |
2 | * Power button driver for Medfield. | |
3 | * | |
4 | * Copyright (C) 2010 Intel Corp | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; version 2 of the License. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License along | |
16 | * with this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
18 | */ | |
19 | ||
20 | #include <linux/module.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/interrupt.h> | |
23 | #include <linux/slab.h> | |
24 | #include <linux/platform_device.h> | |
25 | #include <linux/input.h> | |
26 | #include <asm/intel_scu_ipc.h> | |
27 | ||
28 | #define DRIVER_NAME "msic_power_btn" | |
29 | ||
30 | #define MSIC_IRQ_STAT 0x02 | |
31 | #define MSIC_IRQ_PB (1 << 0) | |
32 | #define MSIC_PB_CONFIG 0x3e | |
33 | #define MSIC_PB_STATUS 0x3f | |
34 | #define MSIC_PB_LEVEL (1 << 3) /* 1 - release, 0 - press */ | |
35 | ||
36 | struct mfld_pb_priv { | |
37 | struct input_dev *input; | |
38 | unsigned int irq; | |
39 | }; | |
40 | ||
41 | static irqreturn_t mfld_pb_isr(int irq, void *dev_id) | |
42 | { | |
43 | struct mfld_pb_priv *priv = dev_id; | |
44 | int ret; | |
45 | u8 pbstat; | |
46 | ||
47 | ret = intel_scu_ipc_ioread8(MSIC_PB_STATUS, &pbstat); | |
48 | if (ret < 0) | |
49 | return IRQ_HANDLED; | |
50 | ||
51 | input_event(priv->input, EV_KEY, KEY_POWER, !(pbstat & MSIC_PB_LEVEL)); | |
52 | input_sync(priv->input); | |
53 | ||
54 | return IRQ_HANDLED; | |
55 | } | |
56 | ||
57 | static int __devinit mfld_pb_probe(struct platform_device *pdev) | |
58 | { | |
59 | struct mfld_pb_priv *priv; | |
60 | struct input_dev *input; | |
61 | int irq; | |
62 | int error; | |
63 | ||
64 | irq = platform_get_irq(pdev, 0); | |
65 | if (irq < 0) | |
66 | return -EINVAL; | |
67 | ||
68 | priv = kzalloc(sizeof(struct mfld_pb_priv), GFP_KERNEL); | |
69 | input = input_allocate_device(); | |
70 | if (!priv || !input) { | |
71 | error = -ENOMEM; | |
72 | goto err_free_mem; | |
73 | } | |
74 | ||
75 | priv->input = input; | |
76 | priv->irq = irq; | |
77 | ||
78 | input->name = pdev->name; | |
79 | input->phys = "power-button/input0"; | |
80 | input->id.bustype = BUS_HOST; | |
81 | input->dev.parent = &pdev->dev; | |
82 | ||
83 | input_set_capability(input, EV_KEY, KEY_POWER); | |
84 | ||
85 | error = request_threaded_irq(priv->irq, NULL, mfld_pb_isr, | |
86 | 0, DRIVER_NAME, priv); | |
87 | if (error) { | |
88 | dev_err(&pdev->dev, | |
89 | "unable to request irq %d for mfld power button\n", | |
90 | irq); | |
91 | goto err_free_mem; | |
92 | } | |
93 | ||
94 | error = input_register_device(input); | |
95 | if (error) { | |
96 | dev_err(&pdev->dev, | |
97 | "unable to register input dev, error %d\n", error); | |
98 | goto err_free_irq; | |
99 | } | |
100 | ||
101 | platform_set_drvdata(pdev, priv); | |
102 | return 0; | |
103 | ||
104 | err_free_irq: | |
105 | free_irq(priv->irq, priv); | |
106 | err_free_mem: | |
107 | input_free_device(input); | |
108 | kfree(priv); | |
109 | return error; | |
110 | } | |
111 | ||
112 | static int __devexit mfld_pb_remove(struct platform_device *pdev) | |
113 | { | |
114 | struct mfld_pb_priv *priv = platform_get_drvdata(pdev); | |
115 | ||
116 | free_irq(priv->irq, priv); | |
117 | input_unregister_device(priv->input); | |
118 | kfree(priv); | |
119 | ||
120 | platform_set_drvdata(pdev, NULL); | |
121 | return 0; | |
122 | } | |
123 | ||
124 | static struct platform_driver mfld_pb_driver = { | |
125 | .driver = { | |
126 | .name = DRIVER_NAME, | |
127 | .owner = THIS_MODULE, | |
128 | }, | |
129 | .probe = mfld_pb_probe, | |
130 | .remove = __devexit_p(mfld_pb_remove), | |
131 | }; | |
132 | ||
133 | static int __init mfld_pb_init(void) | |
134 | { | |
135 | return platform_driver_register(&mfld_pb_driver); | |
136 | } | |
137 | module_init(mfld_pb_init); | |
138 | ||
139 | static void __exit mfld_pb_exit(void) | |
140 | { | |
141 | platform_driver_unregister(&mfld_pb_driver); | |
142 | } | |
143 | module_exit(mfld_pb_exit); | |
144 | ||
145 | MODULE_AUTHOR("Hong Liu <hong.liu@intel.com>"); | |
146 | MODULE_DESCRIPTION("Intel Medfield Power Button Driver"); | |
147 | MODULE_LICENSE("GPL v2"); | |
148 | MODULE_ALIAS("platform:" DRIVER_NAME); |