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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> | |
b9e06694 | 26 | |
8eec8a11 HL |
27 | #include <asm/intel_scu_ipc.h> |
28 | ||
29 | #define DRIVER_NAME "msic_power_btn" | |
30 | ||
8eec8a11 | 31 | #define MSIC_PB_STATUS 0x3f |
b9e06694 | 32 | #define MSIC_PB_LEVEL (1 << 3) /* 1 - release, 0 - press */ |
8eec8a11 HL |
33 | |
34 | static irqreturn_t mfld_pb_isr(int irq, void *dev_id) | |
35 | { | |
b9e06694 | 36 | struct input_dev *input = dev_id; |
8eec8a11 HL |
37 | int ret; |
38 | u8 pbstat; | |
39 | ||
40 | ret = intel_scu_ipc_ioread8(MSIC_PB_STATUS, &pbstat); | |
b9e06694 AP |
41 | if (ret < 0) { |
42 | dev_err(input->dev.parent, "Read error %d while reading" | |
43 | " MSIC_PB_STATUS\n", ret); | |
44 | } else { | |
45 | input_event(input, EV_KEY, KEY_POWER, | |
46 | !(pbstat & MSIC_PB_LEVEL)); | |
47 | input_sync(input); | |
48 | } | |
8eec8a11 HL |
49 | |
50 | return IRQ_HANDLED; | |
51 | } | |
52 | ||
53 | static int __devinit mfld_pb_probe(struct platform_device *pdev) | |
54 | { | |
8eec8a11 | 55 | struct input_dev *input; |
b9e06694 | 56 | int irq = platform_get_irq(pdev, 0); |
8eec8a11 HL |
57 | int error; |
58 | ||
8eec8a11 HL |
59 | if (irq < 0) |
60 | return -EINVAL; | |
61 | ||
8eec8a11 | 62 | input = input_allocate_device(); |
b9e06694 AP |
63 | if (!input) { |
64 | dev_err(&pdev->dev, "Input device allocation error\n"); | |
65 | return -ENOMEM; | |
8eec8a11 HL |
66 | } |
67 | ||
8eec8a11 HL |
68 | input->name = pdev->name; |
69 | input->phys = "power-button/input0"; | |
70 | input->id.bustype = BUS_HOST; | |
71 | input->dev.parent = &pdev->dev; | |
72 | ||
73 | input_set_capability(input, EV_KEY, KEY_POWER); | |
74 | ||
b9e06694 AP |
75 | error = request_threaded_irq(irq, NULL, mfld_pb_isr, 0, |
76 | DRIVER_NAME, input); | |
8eec8a11 | 77 | if (error) { |
b9e06694 AP |
78 | dev_err(&pdev->dev, "Unable to request irq %d for mfld power" |
79 | "button\n", irq); | |
80 | goto err_free_input; | |
8eec8a11 HL |
81 | } |
82 | ||
83 | error = input_register_device(input); | |
84 | if (error) { | |
b9e06694 AP |
85 | dev_err(&pdev->dev, "Unable to register input dev, error " |
86 | "%d\n", error); | |
8eec8a11 HL |
87 | goto err_free_irq; |
88 | } | |
89 | ||
b9e06694 | 90 | platform_set_drvdata(pdev, input); |
8eec8a11 HL |
91 | return 0; |
92 | ||
93 | err_free_irq: | |
b9e06694 AP |
94 | free_irq(irq, input); |
95 | err_free_input: | |
8eec8a11 | 96 | input_free_device(input); |
8eec8a11 HL |
97 | return error; |
98 | } | |
99 | ||
100 | static int __devexit mfld_pb_remove(struct platform_device *pdev) | |
101 | { | |
b9e06694 AP |
102 | struct input_dev *input = platform_get_drvdata(pdev); |
103 | int irq = platform_get_irq(pdev, 0); | |
8eec8a11 | 104 | |
b9e06694 AP |
105 | free_irq(irq, input); |
106 | input_unregister_device(input); | |
8eec8a11 | 107 | platform_set_drvdata(pdev, NULL); |
b9e06694 | 108 | |
8eec8a11 HL |
109 | return 0; |
110 | } | |
111 | ||
112 | static struct platform_driver mfld_pb_driver = { | |
113 | .driver = { | |
114 | .name = DRIVER_NAME, | |
115 | .owner = THIS_MODULE, | |
116 | }, | |
117 | .probe = mfld_pb_probe, | |
118 | .remove = __devexit_p(mfld_pb_remove), | |
119 | }; | |
120 | ||
121 | static int __init mfld_pb_init(void) | |
122 | { | |
123 | return platform_driver_register(&mfld_pb_driver); | |
124 | } | |
125 | module_init(mfld_pb_init); | |
126 | ||
127 | static void __exit mfld_pb_exit(void) | |
128 | { | |
129 | platform_driver_unregister(&mfld_pb_driver); | |
130 | } | |
131 | module_exit(mfld_pb_exit); | |
132 | ||
133 | MODULE_AUTHOR("Hong Liu <hong.liu@intel.com>"); | |
134 | MODULE_DESCRIPTION("Intel Medfield Power Button Driver"); | |
135 | MODULE_LICENSE("GPL v2"); | |
136 | MODULE_ALIAS("platform:" DRIVER_NAME); |