1/*
2 * Resume reason sysfs for the Openmoko Freerunner GSM Phone
3 *
4 * (C) 2008 by Openmoko Inc.
5 * Author: Andy Green <andy@openmoko.com>
6 * All rights reserved.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License resume_reason 2 as
10 * published by the Free Software Foundation
11 *
12 */
13
14#include <linux/module.h>
15#include <linux/init.h>
16#include <linux/kernel.h>
17#include <linux/platform_device.h>
18#include <linux/io.h>
19
20#include <mach/regs-gpio.h>
21
22static unsigned int *gstatus4_mapped;
23static char *resume_reasons[17] = {
24	"EINT00_ACCEL1",
25	"EINT01_GSM",
26	"EINT02_BLUETOOTH",
27	"EINT03_DEBUGBRD",
28	"EINT04_JACK",
29	"EINT05_WLAN",
30	"EINT06_AUXKEY",
31	"EINT07_HOLDKEY",
32	"EINT08_ACCEL2",
33	"EINT09_PMU",
34	"EINT10_NULL",
35	"EINT11_NULL",
36	"EINT12_GLAMO",
37	"EINT13_NULL",
38	"EINT14_NULL",
39	"EINT15_NULL",
40	NULL
41};
42
43static ssize_t resume_reason_read(struct device *dev,
44				  struct device_attribute *attr,
45				  char *buf)
46{
47	int bit = 0;
48	char *end = buf;
49
50	for (bit = 0; resume_reasons[bit]; bit++) {
51		if ((*gstatus4_mapped) & (1 << bit))
52			end += sprintf(end, "* %s\n", resume_reasons[bit]);
53		else
54			end += sprintf(end, "  %s\n", resume_reasons[bit]);
55
56	}
57
58	return end - buf;
59}
60
61
62static DEVICE_ATTR(resume_reason, 0644, resume_reason_read, NULL);
63
64static struct attribute *gta02_resume_reason_sysfs_entries[] = {
65	&dev_attr_resume_reason.attr,
66	NULL
67};
68
69static struct attribute_group gta02_resume_reason_attr_group = {
70	.name	= NULL,
71	.attrs	= gta02_resume_reason_sysfs_entries,
72};
73
74static int __init gta02_resume_reason_probe(struct platform_device *pdev)
75{
76	dev_info(&pdev->dev, "starting\n");
77
78	gstatus4_mapped = ioremap(S3C24XX_GSTATUS4, 0x4);
79	if (!gstatus4_mapped) {
80		dev_err(&pdev->dev, "failed to ioremap() memory region\n");
81		return -EINVAL;
82	}
83
84	return sysfs_create_group(&pdev->dev.kobj,
85					    &gta02_resume_reason_attr_group);
86}
87
88static int gta02_resume_reason_remove(struct platform_device *pdev)
89{
90	sysfs_remove_group(&pdev->dev.kobj, &gta02_resume_reason_attr_group);
91	iounmap(gstatus4_mapped);
92	return 0;
93}
94
95static struct platform_driver gta02_resume_reason_driver = {
96	.probe		= gta02_resume_reason_probe,
97	.remove		= gta02_resume_reason_remove,
98	.driver		= {
99		.name		= "gta02-resume-reason",
100	},
101};
102
103static int __devinit gta02_resume_reason_init(void)
104{
105	return platform_driver_register(&gta02_resume_reason_driver);
106}
107
108static void gta02_resume_reason_exit(void)
109{
110	platform_driver_unregister(&gta02_resume_reason_driver);
111}
112
113module_init(gta02_resume_reason_init);
114module_exit(gta02_resume_reason_exit);
115
116MODULE_LICENSE("GPL");
117MODULE_AUTHOR("Andy Green <andy@openmoko.com>");
118MODULE_DESCRIPTION("GTA02 resume_reason");
119