treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157

[sfrench/cifs-2.6.git] / drivers / input / keyboard / sun4i-lradc-keys.c

diff --git a/drivers/input/keyboard/sun4i-lradc-keys.c b/drivers/input/keyboard/sun4i-lradc-keys.c
index 57272df34cd5447373e32abba853ac694f5af3c0..6ffdc26b9c89a897fee7fcfc7dd2e8f252e60fe4 100644 (file)
--- a/drivers/input/keyboard/sun4i-lradc-keys.c
+++ b/drivers/input/keyboard/sun4i-lradc-keys.c
@@ -1,17 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Allwinner sun4i low res adc attached tablet keys driver
  *
  * Copyright (C) 2014 Hans de Goede <hdegoede@redhat.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
  */
 
 /*
@@ -46,6 +37,7 @@
 #define CONTINUE_TIME_SEL(x)   ((x) << 16) /* 4 bits */
 #define KEY_MODE_SEL(x)                ((x) << 12) /* 2 bits */
 #define LEVELA_B_CNT(x)                ((x) << 8)  /* 4 bits */
+#define HOLD_KEY_EN(x)         ((x) << 7)
 #define HOLD_EN(x)             ((x) << 6)
 #define LEVELB_VOL(x)          ((x) << 4)  /* 2 bits */
 #define SAMPLE_RATE(x)         ((x) << 2)  /* 2 bits */
@@ -63,6 +55,25 @@
 #define        CHAN0_KEYDOWN_IRQ       BIT(1)
 #define CHAN0_DATA_IRQ         BIT(0)
 
+/* struct lradc_variant - Describe sun4i-a10-lradc-keys hardware variant
+ * @divisor_numerator:         The numerator of lradc Vref internally divisor
+ * @divisor_denominator:       The denominator of lradc Vref internally divisor
+ */
+struct lradc_variant {
+       u8 divisor_numerator;
+       u8 divisor_denominator;
+};
+
+static const struct lradc_variant lradc_variant_a10 = {
+       .divisor_numerator = 2,
+       .divisor_denominator = 3
+};
+
+static const struct lradc_variant r_lradc_variant_a83t = {
+       .divisor_numerator = 3,
+       .divisor_denominator = 4
+};
+
 struct sun4i_lradc_keymap {
        u32 voltage;
        u32 keycode;
@@ -74,6 +85,7 @@ struct sun4i_lradc_data {
        void __iomem *base;
        struct regulator *vref_supply;
        struct sun4i_lradc_keymap *chan0_map;
+       const struct lradc_variant *variant;
        u32 chan0_map_count;
        u32 chan0_keycode;
        u32 vref;
@@ -128,9 +140,9 @@ static int sun4i_lradc_open(struct input_dev *dev)
        if (error)
                return error;
 
-       /* lradc Vref internally is divided by 2/3 */
-       lradc->vref = regulator_get_voltage(lradc->vref_supply) * 2 / 3;
-
+       lradc->vref = regulator_get_voltage(lradc->vref_supply) *
+                     lradc->variant->divisor_numerator /
+                     lradc->variant->divisor_denominator;
        /*
         * Set sample time to 4 ms / 250 Hz. Wait 2 * 4 ms for key to
         * stabilize on press, wait (1 + 1) * 4 ms for key release
@@ -222,6 +234,12 @@ static int sun4i_lradc_probe(struct platform_device *pdev)
        if (error)
                return error;
 
+       lradc->variant = of_device_get_match_data(&pdev->dev);
+       if (!lradc->variant) {
+               dev_err(&pdev->dev, "Missing sun4i-a10-lradc-keys variant\n");
+               return -EINVAL;
+       }
+
        lradc->vref_supply = devm_regulator_get(dev, "vref");
        if (IS_ERR(lradc->vref_supply))
                return PTR_ERR(lradc->vref_supply);
@@ -265,7 +283,10 @@ static int sun4i_lradc_probe(struct platform_device *pdev)
 }
 
 static const struct of_device_id sun4i_lradc_of_match[] = {
-       { .compatible = "allwinner,sun4i-a10-lradc-keys", },
+       { .compatible = "allwinner,sun4i-a10-lradc-keys",
+               .data = &lradc_variant_a10 },
+       { .compatible = "allwinner,sun8i-a83t-r-lradc",
+               .data = &r_lradc_variant_a83t },
        { /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, sun4i_lradc_of_match);