1/*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License version 2 as
4 * published by the Free Software Foundation.
5 *
6 * h3600 atmel micro companion support, key subdevice
7 * based on previous kernel 2.4 version
8 * Author : Alessandro Gardich <gremlin@gremlin.it>
9 * Author : Linus Walleij <linus.walleij@linaro.org>
10 *
11 */
12#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/fs.h>
15#include <linux/interrupt.h>
16#include <linux/sched.h>
17#include <linux/pm.h>
18#include <linux/sysctl.h>
19#include <linux/proc_fs.h>
20#include <linux/delay.h>
21#include <linux/device.h>
22#include <linux/input.h>
23#include <linux/platform_device.h>
24#include <linux/mfd/ipaq-micro.h>
25
26struct ipaq_micro_keys {
27	struct ipaq_micro *micro;
28	struct input_dev *input;
29	u16 *codes;
30};
31
32static const u16 micro_keycodes[] = {
33	KEY_RECORD,		/* 1:  Record button			*/
34	KEY_CALENDAR,		/* 2:  Calendar				*/
35	KEY_ADDRESSBOOK,	/* 3:  Contacts (looks like Outlook)	*/
36	KEY_MAIL,		/* 4:  Envelope (Q on older iPAQs)	*/
37	KEY_HOMEPAGE,		/* 5:  Start (looks like swoopy arrow)	*/
38	KEY_UP,			/* 6:  Up				*/
39	KEY_RIGHT,		/* 7:  Right				*/
40	KEY_LEFT,		/* 8:  Left				*/
41	KEY_DOWN,		/* 9:  Down				*/
42};
43
44static void micro_key_receive(void *data, int len, unsigned char *msg)
45{
46	struct ipaq_micro_keys *keys = data;
47	int key, down;
48
49	down = 0x80 & msg[0];
50	key  = 0x7f & msg[0];
51
52	if (key < ARRAY_SIZE(micro_keycodes)) {
53		input_report_key(keys->input, keys->codes[key], down);
54		input_sync(keys->input);
55	}
56}
57
58static void micro_key_start(struct ipaq_micro_keys *keys)
59{
60	spin_lock(&keys->micro->lock);
61	keys->micro->key = micro_key_receive;
62	keys->micro->key_data = keys;
63	spin_unlock(&keys->micro->lock);
64}
65
66static void micro_key_stop(struct ipaq_micro_keys *keys)
67{
68	spin_lock(&keys->micro->lock);
69	keys->micro->key = NULL;
70	keys->micro->key_data = NULL;
71	spin_unlock(&keys->micro->lock);
72}
73
74static int micro_key_open(struct input_dev *input)
75{
76	struct ipaq_micro_keys *keys = input_get_drvdata(input);
77
78	micro_key_start(keys);
79
80	return 0;
81}
82
83static void micro_key_close(struct input_dev *input)
84{
85	struct ipaq_micro_keys *keys = input_get_drvdata(input);
86
87	micro_key_stop(keys);
88}
89
90static int micro_key_probe(struct platform_device *pdev)
91{
92	struct ipaq_micro_keys *keys;
93	int error;
94	int i;
95
96	keys = devm_kzalloc(&pdev->dev, sizeof(*keys), GFP_KERNEL);
97	if (!keys)
98		return -ENOMEM;
99
100	keys->micro = dev_get_drvdata(pdev->dev.parent);
101
102	keys->input = devm_input_allocate_device(&pdev->dev);
103	if (!keys->input)
104		return -ENOMEM;
105
106	keys->input->keycodesize = sizeof(micro_keycodes[0]);
107	keys->input->keycodemax = ARRAY_SIZE(micro_keycodes);
108	keys->codes = devm_kmemdup(&pdev->dev, micro_keycodes,
109			   keys->input->keycodesize * keys->input->keycodemax,
110			   GFP_KERNEL);
111	keys->input->keycode = keys->codes;
112
113	__set_bit(EV_KEY, keys->input->evbit);
114	for (i = 0; i < ARRAY_SIZE(micro_keycodes); i++)
115		__set_bit(micro_keycodes[i], keys->input->keybit);
116
117	keys->input->name = "h3600 micro keys";
118	keys->input->open = micro_key_open;
119	keys->input->close = micro_key_close;
120	input_set_drvdata(keys->input, keys);
121
122	error = input_register_device(keys->input);
123	if (error)
124		return error;
125
126	platform_set_drvdata(pdev, keys);
127	return 0;
128}
129
130static int __maybe_unused micro_key_suspend(struct device *dev)
131{
132	struct ipaq_micro_keys *keys = dev_get_drvdata(dev);
133
134	micro_key_stop(keys);
135
136	return 0;
137}
138
139static int __maybe_unused micro_key_resume(struct device *dev)
140{
141	struct ipaq_micro_keys *keys = dev_get_drvdata(dev);
142	struct input_dev *input = keys->input;
143
144	mutex_lock(&input->mutex);
145
146	if (input->users)
147		micro_key_start(keys);
148
149	mutex_unlock(&input->mutex);
150
151	return 0;
152}
153
154static SIMPLE_DEV_PM_OPS(micro_key_dev_pm_ops,
155			 micro_key_suspend, micro_key_resume);
156
157static struct platform_driver micro_key_device_driver = {
158	.driver = {
159		.name    = "ipaq-micro-keys",
160		.pm	= &micro_key_dev_pm_ops,
161	},
162	.probe   = micro_key_probe,
163};
164module_platform_driver(micro_key_device_driver);
165
166MODULE_LICENSE("GPL");
167MODULE_DESCRIPTION("driver for iPAQ Atmel micro keys");
168MODULE_ALIAS("platform:ipaq-micro-keys");
169