From 9df731a176aab8e03b984b681b1bea01ccff6644 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Mon, 06 Nov 2023 07:23:06 +0000
Subject: [PATCH] rk3568 rt uboot init
---
u-boot/drivers/input/adc_key.c | 62 ++++++++++++++++++++-----------
1 files changed, 40 insertions(+), 22 deletions(-)
diff --git a/u-boot/drivers/input/adc_key.c b/u-boot/drivers/input/adc_key.c
index 391e324..32e63d0 100644
--- a/u-boot/drivers/input/adc_key.c
+++ b/u-boot/drivers/input/adc_key.c
@@ -11,13 +11,10 @@
static int adc_key_ofdata_to_platdata(struct udevice *dev)
{
struct dm_key_uclass_platdata *uc_key;
- u32 chn[2], mV;
- int vref, ret;
-#ifdef CONFIG_SARADC_ROCKCHIP_V2
- int range = 4096; /* 12-bit adc */
-#else
- int range = 1024; /* 10-bit adc */
-#endif
+ int t, down_threshold = -1, up_threshold;
+ int ret, num = 0, volt_margin = 150000; /* will be div 2 */
+ u32 voltage, chn[2];
+ ofnode node;
uc_key = dev_get_uclass_platdata(dev);
if (!uc_key)
@@ -33,29 +30,50 @@
return -EINVAL;
}
- vref = dev_read_u32_default(dev_get_parent(dev),
+ up_threshold = 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;
- }
+ if (up_threshold < 0)
+ return -ENODATA;
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;
+ if (uc_key->code < 0)
+ return -ENODATA;
+
+ voltage = dev_read_u32_default(dev, "press-threshold-microvolt", -ENODATA);
+ if (voltage < 0)
+ return -ENODATA;
+
+ dev_for_each_subnode(node, dev->parent) {
+ ret = ofnode_read_s32(node, "press-threshold-microvolt", &t);
+ if (ret)
+ return ret;
+
+ if (t > voltage && t < up_threshold)
+ up_threshold = t;
+ else if (t < voltage && t > down_threshold)
+ down_threshold = t;
+ num++;
}
- 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;
+ /* although one node only, it doesn't mean only one key on hardware */
+ if (num == 1) {
+ down_threshold = voltage - volt_margin;
+ up_threshold = voltage + volt_margin;
}
+ uc_key->in_volt = 1;
uc_key->channel = chn[1];
- uc_key->adcval = mV / (vref / range);
+ uc_key->center = voltage;
+ /*
+ * Define the voltage range such that the button is only pressed
+ * when the voltage is closest to its own press-threshold-microvolt
+ */
+ if (down_threshold < 0)
+ uc_key->min = 0;
+ else
+ uc_key->min = down_threshold + (voltage - down_threshold) / 2;
+
+ uc_key->max = voltage + (up_threshold - voltage) / 2;
return 0;
}
--
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