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 adc_key_ofdata_to_platdata(struct udevice *dev) 12 { 13 struct dm_key_uclass_platdata *uc_key; 14 u32 chn[2], mV; 15 int vref, ret; 16 17 uc_key = dev_get_uclass_platdata(dev); 18 if (!uc_key) 19 return -ENXIO; 20 21 uc_key->type = ADC_KEY; 22 uc_key->name = dev_read_string(dev, "label"); 23 ret = dev_read_u32_array(dev_get_parent(dev), 24 "io-channels", chn, ARRAY_SIZE(chn)); 25 if (ret) { 26 printf("%s: read 'io-channels' failed, ret=%d\n", 27 uc_key->name, ret); 28 return -EINVAL; 29 } 30 31 vref = dev_read_u32_default(dev_get_parent(dev), 32 "keyup-threshold-microvolt", -ENODATA); 33 if (vref < 0) { 34 printf("%s: read 'keyup-threshold-microvolt' failed, ret=%d\n", 35 uc_key->name, vref); 36 return -EINVAL; 37 } 38 39 uc_key->code = dev_read_u32_default(dev, "linux,code", -ENODATA); 40 if (uc_key->code < 0) { 41 printf("%s: read 'linux,code' failed\n", uc_key->name); 42 return -EINVAL; 43 } 44 45 mV = dev_read_u32_default(dev, "press-threshold-microvolt", -ENODATA); 46 if (mV < 0) { 47 printf("%s: read 'press-threshold-microvolt' failed\n", 48 uc_key->name); 49 return -EINVAL; 50 } 51 52 uc_key->channel = chn[1]; 53 uc_key->adcval = mV / (vref / 1024); 54 55 return 0; 56 } 57 58 U_BOOT_DRIVER(adc_key) = { 59 .name = "adc_key", 60 .id = UCLASS_KEY, 61 .ofdata_to_platdata = adc_key_ofdata_to_platdata, 62 }; 63 64 /* Key Bus */ 65 static int adc_key_bus_bind(struct udevice *dev) 66 { 67 return key_bind_children(dev, "adc_key"); 68 } 69 70 static const struct udevice_id adc_key_bus_match[] = { 71 { .compatible = "adc-keys" }, 72 { }, 73 }; 74 75 U_BOOT_DRIVER(adc_key_bus) = { 76 .name = "adc_key_bus", 77 .id = UCLASS_SIMPLE_BUS, 78 .of_match = adc_key_bus_match, 79 .bind = adc_key_bus_bind, 80 }; 81