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/*
* (C) Copyright 2017 Rockchip Electronics Co., Ltd
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.h>
#include <key.h>
static int adc_key_ofdata_to_platdata(struct udevice *dev)
{
struct dm_key_uclass_platdata *uc_key;
u32 chn[2], mV;
int vref, ret;
uc_key = dev_get_uclass_platdata(dev);
if (!uc_key)
return -ENXIO;
uc_key->type = ADC_KEY;
uc_key->name = dev_read_string(dev, "label");
ret = dev_read_u32_array(dev_get_parent(dev),
"io-channels", chn, ARRAY_SIZE(chn));
if (ret) {
printf("%s: read 'io-channels' failed, ret=%d\n",
uc_key->name, ret);
return -EINVAL;
}
vref = dev_read_u32_default(dev_get_parent(dev),
"keyup-threshold-microvolt", -ENODATA);
if (vref < 0) {
printf("%s: read 'keyup-threshold-microvolt' failed, ret=%d\n",
uc_key->name, vref);
return -EINVAL;
}
uc_key->code = dev_read_u32_default(dev, "linux,code", -ENODATA);
if (uc_key->code < 0) {
printf("%s: read 'linux,code' failed\n", uc_key->name);
return -EINVAL;
}
mV = dev_read_u32_default(dev, "press-threshold-microvolt", -ENODATA);
if (mV < 0) {
printf("%s: read 'press-threshold-microvolt' failed\n",
uc_key->name);
return -EINVAL;
}
uc_key->channel = chn[1];
uc_key->adcval = mV / (vref / 1024);
return 0;
}
U_BOOT_DRIVER(adc_key) = {
.name = "adc_key",
.id = UCLASS_KEY,
.ofdata_to_platdata = adc_key_ofdata_to_platdata,
};
/* Key Bus */
static int adc_key_bus_bind(struct udevice *dev)
{
return key_bind_children(dev, "adc_key");
}
static const struct udevice_id adc_key_bus_match[] = {
{ .compatible = "adc-keys" },
{ },
};
U_BOOT_DRIVER(adc_key_bus) = {
.name = "adc_key_bus",
.id = UCLASS_SIMPLE_BUS,
.of_match = adc_key_bus_match,
.bind = adc_key_bus_bind,
};
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