ipaq-micro-keys.c

  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	guard(spinlock)(&keys->micro->lock);
 58
 59	keys->micro->key = micro_key_receive;
 60	keys->micro->key_data = keys;
 61}
 62
 63static void micro_key_stop(struct ipaq_micro_keys *keys)
 64{
 65	guard(spinlock)(&keys->micro->lock);
 66
 67	keys->micro->key = NULL;
 68	keys->micro->key_data = NULL;
 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_array(&pdev->dev, micro_keycodes, keys->input->keycodemax,
106					 keys->input->keycodesize, GFP_KERNEL);
107	if (!keys->codes)
108		return -ENOMEM;
109
110	keys->input->keycode = keys->codes;
111
112	__set_bit(EV_KEY, keys->input->evbit);
113	for (i = 0; i < ARRAY_SIZE(micro_keycodes); i++)
114		__set_bit(micro_keycodes[i], keys->input->keybit);
115
116	keys->input->name = "h3600 micro keys";
117	keys->input->open = micro_key_open;
118	keys->input->close = micro_key_close;
119	input_set_drvdata(keys->input, keys);
120
121	error = input_register_device(keys->input);
122	if (error)
123		return error;
124
125	platform_set_drvdata(pdev, keys);
126	return 0;
127}
128
129static int micro_key_suspend(struct device *dev)
130{
131	struct ipaq_micro_keys *keys = dev_get_drvdata(dev);
132
133	micro_key_stop(keys);
134
135	return 0;
136}
137
138static int micro_key_resume(struct device *dev)
139{
140	struct ipaq_micro_keys *keys = dev_get_drvdata(dev);
141	struct input_dev *input = keys->input;
142
143	guard(mutex)(&input->mutex);
144
145	if (input_device_enabled(input))
146		micro_key_start(keys);
147
148	return 0;
149}
150
151static DEFINE_SIMPLE_DEV_PM_OPS(micro_key_dev_pm_ops,
152				micro_key_suspend, micro_key_resume);
153
154static struct platform_driver micro_key_device_driver = {
155	.driver = {
156		.name    = "ipaq-micro-keys",
157		.pm	= pm_sleep_ptr(&micro_key_dev_pm_ops),
158	},
159	.probe   = micro_key_probe,
160};
161module_platform_driver(micro_key_device_driver);
162
163MODULE_LICENSE("GPL");
164MODULE_DESCRIPTION("driver for iPAQ Atmel micro keys");
165MODULE_ALIAS("platform:ipaq-micro-keys");