diff options
| author | Mattijs Korpershoek <mkorpershoek@baylibre.com> | 2022-07-26 15:56:10 +0300 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2022-08-11 01:51:01 +0300 |
| commit | 51c88597517d9625c127f0d8f8f3bf04ef5f8d76 (patch) | |
| tree | c530183ca5ed9ce6e48c0319c3cbbb78a38757cf /drivers/input/keyboard/mt6779-keypad.c | |
| parent | e76be36ad9e8560f6d1b02ad12dc912eaa19ddd1 (diff) | |
| download | linux-51c88597517d9625c127f0d8f8f3bf04ef5f8d76.tar.xz | |
Input: mt6779-keypad - support double keys matrix
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>
Diffstat (limited to 'drivers/input/keyboard/mt6779-keypad.c')
| -rw-r--r-- | drivers/input/keyboard/mt6779-keypad.c | 32 |
1 files changed, 31 insertions, 1 deletions
diff --git a/drivers/input/keyboard/mt6779-keypad.c b/drivers/input/keyboard/mt6779-keypad.c index 9decdfa68555..a05e70af1fd0 100644 --- a/drivers/input/keyboard/mt6779-keypad.c +++ b/drivers/input/keyboard/mt6779-keypad.c @@ -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, |