168ed8338SJoseph Chen /* 268ed8338SJoseph Chen * (C) Copyright 2017 Rockchip Electronics Co., Ltd 368ed8338SJoseph Chen * 468ed8338SJoseph Chen * SPDX-License-Identifier: GPL-2.0+ 568ed8338SJoseph Chen */ 668ed8338SJoseph Chen 768ed8338SJoseph Chen #include <common.h> 8*5a54baa7SJoseph Chen #include <dm.h> 968ed8338SJoseph Chen #include <key.h> 1068ed8338SJoseph Chen 11*5a54baa7SJoseph Chen static int adc_key_ofdata_to_platdata(struct udevice *dev) 1268ed8338SJoseph Chen { 13*5a54baa7SJoseph Chen struct dm_key_uclass_platdata *uc_key; 14*5a54baa7SJoseph Chen u32 chn[2], mV; 1564048c53SJoseph Chen int vref, ret; 1668ed8338SJoseph Chen 17*5a54baa7SJoseph Chen uc_key = dev_get_uclass_platdata(dev); 18*5a54baa7SJoseph Chen if (!uc_key) 19*5a54baa7SJoseph Chen return -ENXIO; 20*5a54baa7SJoseph Chen 21*5a54baa7SJoseph Chen uc_key->type = ADC_KEY; 22*5a54baa7SJoseph Chen uc_key->name = dev_read_string(dev, "label"); 23*5a54baa7SJoseph Chen ret = dev_read_u32_array(dev_get_parent(dev), 24*5a54baa7SJoseph Chen "io-channels", chn, ARRAY_SIZE(chn)); 25*5a54baa7SJoseph Chen if (ret) { 26*5a54baa7SJoseph Chen printf("%s: read 'io-channels' failed, ret=%d\n", 27*5a54baa7SJoseph Chen uc_key->name, ret); 28*5a54baa7SJoseph Chen return -EINVAL; 29*5a54baa7SJoseph Chen } 30*5a54baa7SJoseph Chen 31*5a54baa7SJoseph Chen vref = dev_read_u32_default(dev_get_parent(dev), 32*5a54baa7SJoseph Chen "keyup-threshold-microvolt", -ENODATA); 3368ed8338SJoseph Chen if (vref < 0) { 34*5a54baa7SJoseph Chen printf("%s: read 'keyup-threshold-microvolt' failed, ret=%d\n", 35*5a54baa7SJoseph Chen uc_key->name, vref); 3668ed8338SJoseph Chen return -EINVAL; 3768ed8338SJoseph Chen } 3868ed8338SJoseph Chen 39*5a54baa7SJoseph Chen uc_key->code = dev_read_u32_default(dev, "linux,code", -ENODATA); 40*5a54baa7SJoseph Chen if (uc_key->code < 0) { 41*5a54baa7SJoseph Chen printf("%s: read 'linux,code' failed\n", uc_key->name); 4268ed8338SJoseph Chen return -EINVAL; 4368ed8338SJoseph Chen } 4468ed8338SJoseph Chen 45*5a54baa7SJoseph Chen mV = dev_read_u32_default(dev, "press-threshold-microvolt", -ENODATA); 46*5a54baa7SJoseph Chen if (mV < 0) { 47*5a54baa7SJoseph Chen printf("%s: read 'press-threshold-microvolt' failed\n", 48*5a54baa7SJoseph Chen uc_key->name); 49*5a54baa7SJoseph Chen return -EINVAL; 5068ed8338SJoseph Chen } 5164048c53SJoseph Chen 52*5a54baa7SJoseph Chen uc_key->channel = chn[1]; 53*5a54baa7SJoseph Chen uc_key->adcval = mV / (vref / 1024); 5468ed8338SJoseph Chen 5568ed8338SJoseph Chen return 0; 5668ed8338SJoseph Chen } 5768ed8338SJoseph Chen 58*5a54baa7SJoseph Chen U_BOOT_DRIVER(adc_key) = { 59*5a54baa7SJoseph Chen .name = "adc_key", 60*5a54baa7SJoseph Chen .id = UCLASS_KEY, 61*5a54baa7SJoseph Chen .ofdata_to_platdata = adc_key_ofdata_to_platdata, 6268ed8338SJoseph Chen }; 6368ed8338SJoseph Chen 64*5a54baa7SJoseph Chen /* Key Bus */ 65*5a54baa7SJoseph Chen static int adc_key_bus_bind(struct udevice *dev) 66*5a54baa7SJoseph Chen { 67*5a54baa7SJoseph Chen return key_bind_children(dev, "adc_key"); 68*5a54baa7SJoseph Chen } 69*5a54baa7SJoseph Chen 70*5a54baa7SJoseph Chen static const struct udevice_id adc_key_bus_match[] = { 7168ed8338SJoseph Chen { .compatible = "adc-keys" }, 7268ed8338SJoseph Chen { }, 7368ed8338SJoseph Chen }; 7468ed8338SJoseph Chen 75*5a54baa7SJoseph Chen U_BOOT_DRIVER(adc_key_bus) = { 76*5a54baa7SJoseph Chen .name = "adc_key_bus", 77*5a54baa7SJoseph Chen .id = UCLASS_SIMPLE_BUS, 78*5a54baa7SJoseph Chen .of_match = adc_key_bus_match, 79*5a54baa7SJoseph Chen .bind = adc_key_bus_bind, 8068ed8338SJoseph Chen }; 81