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 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 */ 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