1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Cobalt button interface driver.
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2007-2008 Yoichi Yuasa <yuasa@linux-mips.org>
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun #include <linux/input.h>
8*4882a593Smuzhiyun #include <linux/io.h>
9*4882a593Smuzhiyun #include <linux/ioport.h>
10*4882a593Smuzhiyun #include <linux/module.h>
11*4882a593Smuzhiyun #include <linux/platform_device.h>
12*4882a593Smuzhiyun #include <linux/slab.h>
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun #define BUTTONS_POLL_INTERVAL 30 /* msec */
15*4882a593Smuzhiyun #define BUTTONS_COUNT_THRESHOLD 3
16*4882a593Smuzhiyun #define BUTTONS_STATUS_MASK 0xfe000000
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun static const unsigned short cobalt_map[] = {
19*4882a593Smuzhiyun KEY_RESERVED,
20*4882a593Smuzhiyun KEY_RESTART,
21*4882a593Smuzhiyun KEY_LEFT,
22*4882a593Smuzhiyun KEY_UP,
23*4882a593Smuzhiyun KEY_DOWN,
24*4882a593Smuzhiyun KEY_RIGHT,
25*4882a593Smuzhiyun KEY_ENTER,
26*4882a593Smuzhiyun KEY_SELECT
27*4882a593Smuzhiyun };
28*4882a593Smuzhiyun
29*4882a593Smuzhiyun struct buttons_dev {
30*4882a593Smuzhiyun unsigned short keymap[ARRAY_SIZE(cobalt_map)];
31*4882a593Smuzhiyun int count[ARRAY_SIZE(cobalt_map)];
32*4882a593Smuzhiyun void __iomem *reg;
33*4882a593Smuzhiyun };
34*4882a593Smuzhiyun
handle_buttons(struct input_dev * input)35*4882a593Smuzhiyun static void handle_buttons(struct input_dev *input)
36*4882a593Smuzhiyun {
37*4882a593Smuzhiyun struct buttons_dev *bdev = input_get_drvdata(input);
38*4882a593Smuzhiyun uint32_t status;
39*4882a593Smuzhiyun int i;
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun status = ~readl(bdev->reg) >> 24;
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun for (i = 0; i < ARRAY_SIZE(bdev->keymap); i++) {
44*4882a593Smuzhiyun if (status & (1U << i)) {
45*4882a593Smuzhiyun if (++bdev->count[i] == BUTTONS_COUNT_THRESHOLD) {
46*4882a593Smuzhiyun input_event(input, EV_MSC, MSC_SCAN, i);
47*4882a593Smuzhiyun input_report_key(input, bdev->keymap[i], 1);
48*4882a593Smuzhiyun input_sync(input);
49*4882a593Smuzhiyun }
50*4882a593Smuzhiyun } else {
51*4882a593Smuzhiyun if (bdev->count[i] >= BUTTONS_COUNT_THRESHOLD) {
52*4882a593Smuzhiyun input_event(input, EV_MSC, MSC_SCAN, i);
53*4882a593Smuzhiyun input_report_key(input, bdev->keymap[i], 0);
54*4882a593Smuzhiyun input_sync(input);
55*4882a593Smuzhiyun }
56*4882a593Smuzhiyun bdev->count[i] = 0;
57*4882a593Smuzhiyun }
58*4882a593Smuzhiyun }
59*4882a593Smuzhiyun }
60*4882a593Smuzhiyun
cobalt_buttons_probe(struct platform_device * pdev)61*4882a593Smuzhiyun static int cobalt_buttons_probe(struct platform_device *pdev)
62*4882a593Smuzhiyun {
63*4882a593Smuzhiyun struct buttons_dev *bdev;
64*4882a593Smuzhiyun struct input_dev *input;
65*4882a593Smuzhiyun struct resource *res;
66*4882a593Smuzhiyun int error, i;
67*4882a593Smuzhiyun
68*4882a593Smuzhiyun bdev = devm_kzalloc(&pdev->dev, sizeof(*bdev), GFP_KERNEL);
69*4882a593Smuzhiyun if (!bdev)
70*4882a593Smuzhiyun return -ENOMEM;
71*4882a593Smuzhiyun
72*4882a593Smuzhiyun res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
73*4882a593Smuzhiyun if (!res)
74*4882a593Smuzhiyun return -EBUSY;
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun bdev->reg = devm_ioremap(&pdev->dev, res->start, resource_size(res));
77*4882a593Smuzhiyun if (!bdev->reg)
78*4882a593Smuzhiyun return -ENOMEM;
79*4882a593Smuzhiyun
80*4882a593Smuzhiyun memcpy(bdev->keymap, cobalt_map, sizeof(bdev->keymap));
81*4882a593Smuzhiyun
82*4882a593Smuzhiyun input = devm_input_allocate_device(&pdev->dev);
83*4882a593Smuzhiyun if (!input)
84*4882a593Smuzhiyun return -ENOMEM;
85*4882a593Smuzhiyun
86*4882a593Smuzhiyun input_set_drvdata(input, bdev);
87*4882a593Smuzhiyun
88*4882a593Smuzhiyun input->name = "Cobalt buttons";
89*4882a593Smuzhiyun input->phys = "cobalt/input0";
90*4882a593Smuzhiyun input->id.bustype = BUS_HOST;
91*4882a593Smuzhiyun
92*4882a593Smuzhiyun input->keycode = bdev->keymap;
93*4882a593Smuzhiyun input->keycodemax = ARRAY_SIZE(bdev->keymap);
94*4882a593Smuzhiyun input->keycodesize = sizeof(unsigned short);
95*4882a593Smuzhiyun
96*4882a593Smuzhiyun input_set_capability(input, EV_MSC, MSC_SCAN);
97*4882a593Smuzhiyun __set_bit(EV_KEY, input->evbit);
98*4882a593Smuzhiyun for (i = 0; i < ARRAY_SIZE(cobalt_map); i++)
99*4882a593Smuzhiyun __set_bit(bdev->keymap[i], input->keybit);
100*4882a593Smuzhiyun __clear_bit(KEY_RESERVED, input->keybit);
101*4882a593Smuzhiyun
102*4882a593Smuzhiyun
103*4882a593Smuzhiyun error = input_setup_polling(input, handle_buttons);
104*4882a593Smuzhiyun if (error)
105*4882a593Smuzhiyun return error;
106*4882a593Smuzhiyun
107*4882a593Smuzhiyun input_set_poll_interval(input, BUTTONS_POLL_INTERVAL);
108*4882a593Smuzhiyun
109*4882a593Smuzhiyun error = input_register_device(input);
110*4882a593Smuzhiyun if (error)
111*4882a593Smuzhiyun return error;
112*4882a593Smuzhiyun
113*4882a593Smuzhiyun return 0;
114*4882a593Smuzhiyun }
115*4882a593Smuzhiyun
116*4882a593Smuzhiyun MODULE_AUTHOR("Yoichi Yuasa <yuasa@linux-mips.org>");
117*4882a593Smuzhiyun MODULE_DESCRIPTION("Cobalt button interface driver");
118*4882a593Smuzhiyun MODULE_LICENSE("GPL");
119*4882a593Smuzhiyun /* work with hotplug and coldplug */
120*4882a593Smuzhiyun MODULE_ALIAS("platform:Cobalt buttons");
121*4882a593Smuzhiyun
122*4882a593Smuzhiyun static struct platform_driver cobalt_buttons_driver = {
123*4882a593Smuzhiyun .probe = cobalt_buttons_probe,
124*4882a593Smuzhiyun .driver = {
125*4882a593Smuzhiyun .name = "Cobalt buttons",
126*4882a593Smuzhiyun },
127*4882a593Smuzhiyun };
128*4882a593Smuzhiyun module_platform_driver(cobalt_buttons_driver);
129