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 
23 struct ipaq_micro_keys {
24 	struct ipaq_micro *micro;
25 	struct input_dev *input;
26 	u16 *codes;
27 };
28 
29 static 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 
41 static 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 
55 static 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 
63 static 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 
71 static 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 
80 static 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 
87 static 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 	keys->input->keycode = keys->codes;
109 
110 	__set_bit(EV_KEY, keys->input->evbit);
111 	for (i = 0; i < ARRAY_SIZE(micro_keycodes); i++)
112 		__set_bit(micro_keycodes[i], keys->input->keybit);
113 
114 	keys->input->name = "h3600 micro keys";
115 	keys->input->open = micro_key_open;
116 	keys->input->close = micro_key_close;
117 	input_set_drvdata(keys->input, keys);
118 
119 	error = input_register_device(keys->input);
120 	if (error)
121 		return error;
122 
123 	platform_set_drvdata(pdev, keys);
124 	return 0;
125 }
126 
127 static int __maybe_unused micro_key_suspend(struct device *dev)
128 {
129 	struct ipaq_micro_keys *keys = dev_get_drvdata(dev);
130 
131 	micro_key_stop(keys);
132 
133 	return 0;
134 }
135 
136 static int __maybe_unused micro_key_resume(struct device *dev)
137 {
138 	struct ipaq_micro_keys *keys = dev_get_drvdata(dev);
139 	struct input_dev *input = keys->input;
140 
141 	mutex_lock(&input->mutex);
142 
143 	if (input->users)
144 		micro_key_start(keys);
145 
146 	mutex_unlock(&input->mutex);
147 
148 	return 0;
149 }
150 
151 static SIMPLE_DEV_PM_OPS(micro_key_dev_pm_ops,
152 			 micro_key_suspend, micro_key_resume);
153 
154 static struct platform_driver micro_key_device_driver = {
155 	.driver = {
156 		.name    = "ipaq-micro-keys",
157 		.pm	= &micro_key_dev_pm_ops,
158 	},
159 	.probe   = micro_key_probe,
160 };
161 module_platform_driver(micro_key_device_driver);
162 
163 MODULE_LICENSE("GPL");
164 MODULE_DESCRIPTION("driver for iPAQ Atmel micro keys");
165 MODULE_ALIAS("platform:ipaq-micro-keys");
166