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Input: mt6779-keypad - support double keys matrix

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MediaTek keypad has 2 modes of detecting key events:
- single key: each (row, column) can detect one key
- double key: each (row, column) is a group of 2 keys

Double key support exists to minimize cost, since it reduces the number
of pins required for physical keys.

Double key is configured by setting BIT(0) of the KP_SEL register.

Enable double key matrix support based on the mediatek,keys-per-group
device tree property.

Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20220720-mt8183-keypad-v2-5-6d42c357cb76@baylibre.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Mattijs Korpershoek 2022-07-26 14:56:10 +02:00 committed by Dmitry Torokhov
parent e76be36ad9
commit 51c8859751
1 changed files with 31 additions and 1 deletions
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32
drivers/input/keyboard/mt6779-keypad.c
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@ -18,6 +18,7 @@
#define MTK_KPD_DEBOUNCE_MASK GENMASK(13, 0)
#define MTK_KPD_DEBOUNCE_MAX_MS 256
#define MTK_KPD_SEL 0x0020
#define MTK_KPD_SEL_DOUBLE_KP_MODE BIT(0)
#define MTK_KPD_SEL_COL GENMASK(15, 10)
#define MTK_KPD_SEL_ROW GENMASK(9, 4)
#define MTK_KPD_SEL_COLMASK(c) GENMASK((c) + 9, 10)
@ -103,12 +104,21 @@ static void mt6779_keypad_calc_row_col_single(unsigned int key,
*col = key % 9;
}
static void mt6779_keypad_calc_row_col_double(unsigned int key,
unsigned int *row,
unsigned int *col)
{
*row = key / 13;
*col = (key % 13) / 2;
}
static int mt6779_keypad_pdrv_probe(struct platform_device *pdev)
{
struct mt6779_keypad *keypad;
void __iomem *base;
int irq;
u32 debounce;
u32 keys_per_group;
bool wakeup;
int error;
@ -157,7 +167,22 @@ static int mt6779_keypad_pdrv_probe(struct platform_device *pdev)
return -EINVAL;
}
keypad->calc_row_col = mt6779_keypad_calc_row_col_single;
if (device_property_read_u32(&pdev->dev, "mediatek,keys-per-group",
&keys_per_group))
keys_per_group = 1;
switch (keys_per_group) {
case 1:
keypad->calc_row_col = mt6779_keypad_calc_row_col_single;
break;
case 2:
keypad->calc_row_col = mt6779_keypad_calc_row_col_double;
break;
default:
dev_err(&pdev->dev,
"Invalid keys-per-group: %d\n", keys_per_group);
return -EINVAL;
}
wakeup = device_property_read_bool(&pdev->dev, "wakeup-source");
@ -177,6 +202,11 @@ static int mt6779_keypad_pdrv_probe(struct platform_device *pdev)
regmap_write(keypad->regmap, MTK_KPD_DEBOUNCE,
(debounce * (1 << 5)) & MTK_KPD_DEBOUNCE_MASK);
if (keys_per_group == 2)
regmap_update_bits(keypad->regmap, MTK_KPD_SEL,
MTK_KPD_SEL_DOUBLE_KP_MODE,
MTK_KPD_SEL_DOUBLE_KP_MODE);
regmap_update_bits(keypad->regmap, MTK_KPD_SEL, MTK_KPD_SEL_ROW,
MTK_KPD_SEL_ROWMASK(keypad->n_rows));
regmap_update_bits(keypad->regmap, MTK_KPD_SEL, MTK_KPD_SEL_COL,