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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 u-boot/drivers/input/adc_key.c
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@@ -11,13 +11,10 @@
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 static int adc_key_ofdata_to_platdata(struct udevice *dev)
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 {
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 	struct dm_key_uclass_platdata *uc_key;
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-	u32 chn[2], mV;
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-	int vref, ret;
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-#ifdef CONFIG_SARADC_ROCKCHIP_V2
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-	int range = 4096;	/* 12-bit adc */
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-#else
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-	int range = 1024;	/* 10-bit adc */
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-#endif
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+	int t, down_threshold = -1, up_threshold;
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+	int ret, num = 0, volt_margin = 150000;	/* will be div 2 */
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+	u32 voltage, chn[2];
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+	ofnode node;
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18
 
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 	uc_key = dev_get_uclass_platdata(dev);
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 	if (!uc_key)
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@@ -33,29 +30,50 @@
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 		return -EINVAL;
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 	}
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-	vref = dev_read_u32_default(dev_get_parent(dev),
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+	up_threshold = dev_read_u32_default(dev_get_parent(dev),
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 				    "keyup-threshold-microvolt", -ENODATA);
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-	if (vref < 0) {
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-		printf("%s: read 'keyup-threshold-microvolt' failed, ret=%d\n",
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-		       uc_key->name, vref);
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-		return -EINVAL;
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-	}
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+	if (up_threshold < 0)
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+		return -ENODATA;
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 	uc_key->code = dev_read_u32_default(dev, "linux,code", -ENODATA);
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-	if (uc_key->code < 0) {
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-		printf("%s: read 'linux,code' failed\n", uc_key->name);
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-		return -EINVAL;
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+	if (uc_key->code < 0)
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+		return -ENODATA;
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+
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+	voltage = dev_read_u32_default(dev, "press-threshold-microvolt", -ENODATA);
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+	if (voltage < 0)
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+		return -ENODATA;
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+
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+	dev_for_each_subnode(node, dev->parent) {
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+		ret = ofnode_read_s32(node, "press-threshold-microvolt", &t);
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+		if (ret)
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+			return ret;
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+
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+		if (t > voltage && t < up_threshold)
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+			up_threshold = t;
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+		else if (t < voltage && t > down_threshold)
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+			down_threshold = t;
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+		num++;
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 	}
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-	mV = dev_read_u32_default(dev, "press-threshold-microvolt", -ENODATA);
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-	if (mV < 0) {
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-		printf("%s: read 'press-threshold-microvolt' failed\n",
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-		       uc_key->name);
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-		return -EINVAL;
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+	/* although one node only, it doesn't mean only one key on hardware */
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+	if (num == 1) {
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+		down_threshold = voltage - volt_margin;
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+		up_threshold = voltage + volt_margin;
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 	}
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63
 
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+	uc_key->in_volt = 1;
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 	uc_key->channel = chn[1];
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-	uc_key->adcval = mV / (vref / range);
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+	uc_key->center = voltage;
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+	/*
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+	 * Define the voltage range such that the button is only pressed
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+	 * when the voltage is closest to its own press-threshold-microvolt
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+	 */
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+	if (down_threshold < 0)
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+		uc_key->min = 0;
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+	else
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+		uc_key->min = down_threshold + (voltage - down_threshold) / 2;
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+
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+	uc_key->max = voltage + (up_threshold - voltage) / 2;
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77
 
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 	return 0;
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 }