1 /*
2 * (C) Copyright 2017 Rockchip Electronics Co., Ltd
3 *
4 * SPDX-License-Identifier: GPL-2.0+
5 */
6
7 #include <common.h>
8 #include <dm.h>
9 #include <key.h>
10
rk_key_ofdata_to_platdata(struct udevice * dev)11 static int rk_key_ofdata_to_platdata(struct udevice *dev)
12 {
13 struct dm_key_uclass_platdata *uc_key;
14 u32 chn[2];
15
16 uc_key = dev_get_uclass_platdata(dev);
17 if (!uc_key)
18 return -ENXIO;
19
20 uc_key->name = dev_read_string(dev, "label");
21 uc_key->code = dev_read_u32_default(dev, "linux,code", -ENODATA);
22
23 if (dev_read_u32_array(dev_get_parent(dev), "io-channels", chn, 2)) {
24 printf("%s: read 'io-channels' failed\n", uc_key->name);
25 return -EINVAL;
26 }
27
28 if (dev_read_bool(dev, "rockchip,adc_value")) {
29 uc_key->type = ADC_KEY;
30 uc_key->in_volt = 0;
31 uc_key->channel = chn[1];
32 uc_key->center = dev_read_u32_default(dev, "rockchip,adc_value", 0);
33 uc_key->min = uc_key->center - 30;
34 if (uc_key->min < 0)
35 uc_key->min = 0;
36 uc_key->max = uc_key->center + 30;
37 } else {
38 uc_key->type = GPIO_KEY;
39 if (dev_read_u32_array(dev, "gpios",
40 uc_key->gpios,
41 ARRAY_SIZE(uc_key->gpios))) {
42 printf("%s: read 'gpios' failed\n", uc_key->name);
43 return -EINVAL;
44 }
45 }
46
47 return 0;
48 }
49
50 U_BOOT_DRIVER(rk_key) = {
51 .name = "rk_key",
52 .id = UCLASS_KEY,
53 .ofdata_to_platdata = rk_key_ofdata_to_platdata,
54 };
55
56 /* Key Bus */
rk_key_bus_bind(struct udevice * dev)57 static int rk_key_bus_bind(struct udevice *dev)
58 {
59 return key_bind_children(dev, "rk_key");
60 }
61
62 static const struct udevice_id rk_key_bus_match[] = {
63 { .compatible = "rockchip,key" },
64 { },
65 };
66
67 U_BOOT_DRIVER(rk_key_bus) = {
68 .name = "rk_key_bus",
69 .id = UCLASS_SIMPLE_BUS,
70 .of_match = rk_key_bus_match,
71 .bind = rk_key_bus_bind,
72 };
73