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2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/input/keyboard/sun4i-lradc-keys.c
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@@ -1,17 +1,8 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  * Allwinner sun4i low res adc attached tablet keys driver
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  *
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  * Copyright (C) 2014 Hans de Goede <hdegoede@redhat.com>
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License as published by
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- * the Free Software Foundation; either version 2 of the License, or
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- * (at your option) any later version.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
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  */
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 /*
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@@ -46,6 +37,7 @@
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 #define CONTINUE_TIME_SEL(x)	((x) << 16) /* 4 bits */
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 #define KEY_MODE_SEL(x)		((x) << 12) /* 2 bits */
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 #define LEVELA_B_CNT(x)		((x) << 8)  /* 4 bits */
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+#define HOLD_KEY_EN(x)		((x) << 7)
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 #define HOLD_EN(x)		((x) << 6)
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 #define LEVELB_VOL(x)		((x) << 4)  /* 2 bits */
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 #define SAMPLE_RATE(x)		((x) << 2)  /* 2 bits */
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@@ -63,6 +55,25 @@
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 #define	CHAN0_KEYDOWN_IRQ	BIT(1)
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 #define CHAN0_DATA_IRQ		BIT(0)
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+/* struct lradc_variant - Describe sun4i-a10-lradc-keys hardware variant
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+ * @divisor_numerator:		The numerator of lradc Vref internally divisor
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+ * @divisor_denominator:	The denominator of lradc Vref internally divisor
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+ */
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+struct lradc_variant {
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+	u8 divisor_numerator;
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+	u8 divisor_denominator;
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+};
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+
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+static const struct lradc_variant lradc_variant_a10 = {
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+	.divisor_numerator = 2,
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+	.divisor_denominator = 3
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+};
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+
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+static const struct lradc_variant r_lradc_variant_a83t = {
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+	.divisor_numerator = 3,
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+	.divisor_denominator = 4
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+};
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+
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 struct sun4i_lradc_keymap {
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 	u32 voltage;
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 	u32 keycode;
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@@ -74,6 +85,7 @@
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 	void __iomem *base;
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 	struct regulator *vref_supply;
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 	struct sun4i_lradc_keymap *chan0_map;
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+	const struct lradc_variant *variant;
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 	u32 chan0_map_count;
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 	u32 chan0_keycode;
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 	u32 vref;
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@@ -128,9 +140,9 @@
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 	if (error)
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 		return error;
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-	/* lradc Vref internally is divided by 2/3 */
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-	lradc->vref = regulator_get_voltage(lradc->vref_supply) * 2 / 3;
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-
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+	lradc->vref = regulator_get_voltage(lradc->vref_supply) *
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+		      lradc->variant->divisor_numerator /
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+		      lradc->variant->divisor_denominator;
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 	/*
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 	 * Set sample time to 4 ms / 250 Hz. Wait 2 * 4 ms for key to
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 	 * stabilize on press, wait (1 + 1) * 4 ms for key release
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@@ -185,19 +197,22 @@
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197
 
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 		error = of_property_read_u32(pp, "channel", &channel);
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 		if (error || channel != 0) {
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-			dev_err(dev, "%s: Inval channel prop\n", pp->name);
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+			dev_err(dev, "%pOFn: Inval channel prop\n", pp);
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+			of_node_put(pp);
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 			return -EINVAL;
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 		}
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 		error = of_property_read_u32(pp, "voltage", &map->voltage);
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 		if (error) {
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-			dev_err(dev, "%s: Inval voltage prop\n", pp->name);
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+			dev_err(dev, "%pOFn: Inval voltage prop\n", pp);
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+			of_node_put(pp);
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 			return -EINVAL;
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 		}
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 		error = of_property_read_u32(pp, "linux,code", &map->keycode);
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 		if (error) {
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-			dev_err(dev, "%s: Inval linux,code prop\n", pp->name);
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+			dev_err(dev, "%pOFn: Inval linux,code prop\n", pp);
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+			of_node_put(pp);
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 			return -EINVAL;
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 		}
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@@ -221,6 +236,12 @@
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 	error = sun4i_lradc_load_dt_keymap(dev, lradc);
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 	if (error)
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 		return error;
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+
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+	lradc->variant = of_device_get_match_data(&pdev->dev);
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+	if (!lradc->variant) {
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+		dev_err(&pdev->dev, "Missing sun4i-a10-lradc-keys variant\n");
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+		return -EINVAL;
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+	}
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 	lradc->vref_supply = devm_regulator_get(dev, "vref");
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 	if (IS_ERR(lradc->vref_supply))
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@@ -265,7 +286,10 @@
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 }
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 static const struct of_device_id sun4i_lradc_of_match[] = {
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-	{ .compatible = "allwinner,sun4i-a10-lradc-keys", },
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+	{ .compatible = "allwinner,sun4i-a10-lradc-keys",
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+		.data = &lradc_variant_a10 },
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+	{ .compatible = "allwinner,sun8i-a83t-r-lradc",
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+		.data = &r_lradc_variant_a83t },
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 	{ /* sentinel */ }
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 };
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 MODULE_DEVICE_TABLE(of, sun4i_lradc_of_match);