1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 *
4 * h3600 atmel micro companion support, key subdevice
5 * based on previous kernel 2.4 version
6 * Author : Alessandro Gardich <gremlin@gremlin.it>
7 * Author : Linus Walleij <linus.walleij@linaro.org>
8 */
9#include <linux/module.h>
10#include <linux/init.h>
11#include <linux/fs.h>
12#include <linux/interrupt.h>
13#include <linux/sched.h>
14#include <linux/pm.h>
15#include <linux/sysctl.h>
16#include <linux/proc_fs.h>
17#include <linux/delay.h>
18#include <linux/device.h>
19#include <linux/input.h>
20#include <linux/platform_device.h>
21#include <linux/mfd/ipaq-micro.h>
22
23struct ipaq_micro_keys {
24	struct ipaq_micro *micro;
25	struct input_dev *input;
26	u16 *codes;
27};
28
29static const u16 micro_keycodes[] = {
30	KEY_RECORD,		/* 1:  Record button			*/
31	KEY_CALENDAR,		/* 2:  Calendar				*/
32	KEY_ADDRESSBOOK,	/* 3:  Contacts (looks like Outlook)	*/
33	KEY_MAIL,		/* 4:  Envelope (Q on older iPAQs)	*/
34	KEY_HOMEPAGE,		/* 5:  Start (looks like swoopy arrow)	*/
35	KEY_UP,			/* 6:  Up				*/
36	KEY_RIGHT,		/* 7:  Right				*/
37	KEY_LEFT,		/* 8:  Left				*/
38	KEY_DOWN,		/* 9:  Down				*/
39};
40
41static void micro_key_receive(void *data, int len, unsigned char *msg)
42{
43	struct ipaq_micro_keys *keys = data;
44	int key, down;
45
46	down = 0x80 & msg[0];
47	key  = 0x7f & msg[0];
48
49	if (key < ARRAY_SIZE(micro_keycodes)) {
50		input_report_key(keys->input, keys->codes[key], down);
51		input_sync(keys->input);
52	}
53}
54
55static void micro_key_start(struct ipaq_micro_keys *keys)
56{
57	spin_lock(&keys->micro->lock);
58	keys->micro->key = micro_key_receive;
59	keys->micro->key_data = keys;
60	spin_unlock(&keys->micro->lock);
61}
62
63static void micro_key_stop(struct ipaq_micro_keys *keys)
64{
65	spin_lock(&keys->micro->lock);
66	keys->micro->key = NULL;
67	keys->micro->key_data = NULL;
68	spin_unlock(&keys->micro->lock);
69}
70
71static int micro_key_open(struct input_dev *input)
72{
73	struct ipaq_micro_keys *keys = input_get_drvdata(input);
74
75	micro_key_start(keys);
76
77	return 0;
78}
79
80static void micro_key_close(struct input_dev *input)
81{
82	struct ipaq_micro_keys *keys = input_get_drvdata(input);
83
84	micro_key_stop(keys);
85}
86
87static int micro_key_probe(struct platform_device *pdev)
88{
89	struct ipaq_micro_keys *keys;
90	int error;
91	int i;
92
93	keys = devm_kzalloc(&pdev->dev, sizeof(*keys), GFP_KERNEL);
94	if (!keys)
95		return -ENOMEM;
96
97	keys->micro = dev_get_drvdata(pdev->dev.parent);
98
99	keys->input = devm_input_allocate_device(&pdev->dev);
100	if (!keys->input)
101		return -ENOMEM;
102
103	keys->input->keycodesize = sizeof(micro_keycodes[0]);
104	keys->input->keycodemax = ARRAY_SIZE(micro_keycodes);
105	keys->codes = devm_kmemdup(&pdev->dev, micro_keycodes,
106			   keys->input->keycodesize * keys->input->keycodemax,
107			   GFP_KERNEL);
108	if (!keys->codes)
109		return -ENOMEM;
110
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 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 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_device_enabled(input))
147		micro_key_start(keys);
148
149	mutex_unlock(&input->mutex);
150
151	return 0;
152}
153
154static DEFINE_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	= pm_sleep_ptr(&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