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git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
Input: mt6779-keypad - add MediaTek keypad driver
This patch adds matrix keypad support for Mediatek SoCs.
Signed-off-by: fengping.yu <fengping.yu@mediatek.com>
Reviewed-by: Marco Felsch <m.felsch@pengutronix.de>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Link: https://lore.kernel.org/r/20220303154302.252041-3-mkorpershoek@baylibre.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
authored by
fengping.yu
and committed by
Dmitry Torokhov
f28af984
60b2a803
+234
+12
drivers/input/keyboard/Kconfig
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drivers/input/keyboard/Kconfig
···
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To compile this driver as a module, choose M here: the
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module will be called bcm-keypad.
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config KEYBOARD_MT6779
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tristate "MediaTek Keypad Support"
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depends on ARCH_MEDIATEK || COMPILE_TEST
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select REGMAP_MMIO
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select INPUT_MATRIXKMAP
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help
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Say Y here if you want to use the keypad on MediaTek SoCs.
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If unsure, say N.
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To compile this driver as a module, choose M here: the
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module will be called mt6779-keypad.
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config KEYBOARD_MTK_PMIC
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tristate "MediaTek PMIC keys support"
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depends on MFD_MT6397
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drivers/input/keyboard/Makefile
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drivers/input/keyboard/Makefile
···
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obj-$(CONFIG_KEYBOARD_MAX7359) += max7359_keypad.o
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obj-$(CONFIG_KEYBOARD_MCS) += mcs_touchkey.o
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obj-$(CONFIG_KEYBOARD_MPR121) += mpr121_touchkey.o
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obj-$(CONFIG_KEYBOARD_MT6779) += mt6779-keypad.o
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obj-$(CONFIG_KEYBOARD_MTK_PMIC) += mtk-pmic-keys.o
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obj-$(CONFIG_KEYBOARD_NEWTON) += newtonkbd.o
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obj-$(CONFIG_KEYBOARD_NOMADIK) += nomadik-ske-keypad.o
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drivers/input/keyboard/mt6779-keypad.c
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drivers/input/keyboard/mt6779-keypad.c
···
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2022 MediaTek Inc.
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* Author Fengping Yu <fengping.yu@mediatek.com>
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*/
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#include <linux/bitops.h>
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#include <linux/clk.h>
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#include <linux/input/matrix_keypad.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/property.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#define MTK_KPD_NAME "mt6779-keypad"
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#define MTK_KPD_MEM 0x0004
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#define MTK_KPD_DEBOUNCE 0x0018
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#define MTK_KPD_DEBOUNCE_MASK GENMASK(13, 0)
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#define MTK_KPD_DEBOUNCE_MAX_MS 256
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#define MTK_KPD_NUM_MEMS 5
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#define MTK_KPD_NUM_BITS 136 /* 4*32+8 MEM5 only use 8 BITS */
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struct mt6779_keypad {
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struct regmap *regmap;
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struct input_dev *input_dev;
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struct clk *clk;
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void __iomem *base;
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u32 n_rows;
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u32 n_cols;
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DECLARE_BITMAP(keymap_state, MTK_KPD_NUM_BITS);
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};
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static const struct regmap_config mt6779_keypad_regmap_cfg = {
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.reg_bits = 32,
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.val_bits = 32,
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.reg_stride = sizeof(u32),
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.max_register = 36,
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};
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static irqreturn_t mt6779_keypad_irq_handler(int irq, void *dev_id)
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{
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struct mt6779_keypad *keypad = dev_id;
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const unsigned short *keycode = keypad->input_dev->keycode;
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DECLARE_BITMAP(new_state, MTK_KPD_NUM_BITS);
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DECLARE_BITMAP(change, MTK_KPD_NUM_BITS);
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unsigned int bit_nr;
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unsigned int row, col;
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unsigned int scancode;
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unsigned int row_shift = get_count_order(keypad->n_cols);
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bool pressed;
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regmap_bulk_read(keypad->regmap, MTK_KPD_MEM,
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new_state, MTK_KPD_NUM_MEMS);
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bitmap_xor(change, new_state, keypad->keymap_state, MTK_KPD_NUM_BITS);
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for_each_set_bit(bit_nr, change, MTK_KPD_NUM_BITS) {
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/*
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* Registers are 32bits, but only bits [15:0] are used to
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* indicate key status.
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*/
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if (bit_nr % 32 >= 16)
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continue;
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row = bit_nr / 32;
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col = bit_nr % 32;
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scancode = MATRIX_SCAN_CODE(row, col, row_shift);
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/* 1: not pressed, 0: pressed */
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pressed = !test_bit(bit_nr, new_state);
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dev_dbg(&keypad->input_dev->dev, "%s",
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pressed ? "pressed" : "released");
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input_event(keypad->input_dev, EV_MSC, MSC_SCAN, scancode);
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input_report_key(keypad->input_dev, keycode[scancode], pressed);
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input_sync(keypad->input_dev);
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dev_dbg(&keypad->input_dev->dev,
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"report Linux keycode = %d\n", keycode[scancode]);
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}
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bitmap_copy(keypad->keymap_state, new_state, MTK_KPD_NUM_BITS);
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return IRQ_HANDLED;
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}
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static void mt6779_keypad_clk_disable(void *data)
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{
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clk_disable_unprepare(data);
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}
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static int mt6779_keypad_pdrv_probe(struct platform_device *pdev)
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{
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struct mt6779_keypad *keypad;
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unsigned int irq;
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u32 debounce;
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bool wakeup;
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int error;
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keypad = devm_kzalloc(&pdev->dev, sizeof(*keypad), GFP_KERNEL);
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if (!keypad)
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return -ENOMEM;
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keypad->base = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(keypad->base))
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return PTR_ERR(keypad->base);
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keypad->regmap = devm_regmap_init_mmio(&pdev->dev, keypad->base,
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&mt6779_keypad_regmap_cfg);
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if (IS_ERR(keypad->regmap)) {
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dev_err(&pdev->dev,
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"regmap init failed:%pe\n", keypad->regmap);
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return PTR_ERR(keypad->regmap);
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}
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bitmap_fill(keypad->keymap_state, MTK_KPD_NUM_BITS);
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keypad->input_dev = devm_input_allocate_device(&pdev->dev);
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if (!keypad->input_dev) {
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dev_err(&pdev->dev, "Failed to allocate input dev\n");
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return -ENOMEM;
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}
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keypad->input_dev->name = MTK_KPD_NAME;
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keypad->input_dev->id.bustype = BUS_HOST;
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error = matrix_keypad_parse_properties(&pdev->dev, &keypad->n_rows,
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&keypad->n_cols);
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if (error) {
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dev_err(&pdev->dev, "Failed to parse keypad params\n");
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return error;
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}
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if (device_property_read_u32(&pdev->dev, "debounce-delay-ms",
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&debounce))
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debounce = 16;
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if (debounce > MTK_KPD_DEBOUNCE_MAX_MS) {
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dev_err(&pdev->dev,
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"Debounce time exceeds the maximum allowed time %dms\n",
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MTK_KPD_DEBOUNCE_MAX_MS);
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return -EINVAL;
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}
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wakeup = device_property_read_bool(&pdev->dev, "wakeup-source");
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dev_dbg(&pdev->dev, "n_row=%d n_col=%d debounce=%d\n",
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keypad->n_rows, keypad->n_cols, debounce);
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error = matrix_keypad_build_keymap(NULL, NULL,
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keypad->n_rows, keypad->n_cols,
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NULL, keypad->input_dev);
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if (error) {
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dev_err(&pdev->dev, "Failed to build keymap\n");
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return error;
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}
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input_set_capability(keypad->input_dev, EV_MSC, MSC_SCAN);
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regmap_write(keypad->regmap, MTK_KPD_DEBOUNCE,
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(debounce * (1 << 5)) & MTK_KPD_DEBOUNCE_MASK);
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keypad->clk = devm_clk_get(&pdev->dev, "kpd");
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if (IS_ERR(keypad->clk))
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return PTR_ERR(keypad->clk);
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error = clk_prepare_enable(keypad->clk);
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if (error) {
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dev_err(&pdev->dev, "cannot prepare/enable keypad clock\n");
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return error;
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}
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error = devm_add_action_or_reset(&pdev->dev, mt6779_keypad_clk_disable,
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keypad->clk);
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if (error)
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return error;
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irq = platform_get_irq(pdev, 0);
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if (irq < 0)
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return irq;
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error = devm_request_threaded_irq(&pdev->dev, irq,
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NULL, mt6779_keypad_irq_handler,
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IRQF_ONESHOT, MTK_KPD_NAME, keypad);
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if (error) {
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dev_err(&pdev->dev, "Failed to request IRQ#%d: %d\n",
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irq, error);
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return error;
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}
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error = input_register_device(keypad->input_dev);
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if (error) {
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dev_err(&pdev->dev, "Failed to register device\n");
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return error;
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}
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error = device_init_wakeup(&pdev->dev, wakeup);
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if (error)
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dev_warn(&pdev->dev, "device_init_wakeup() failed: %d\n",
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error);
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return 0;
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}
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static const struct of_device_id mt6779_keypad_of_match[] = {
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{ .compatible = "mediatek,mt6779-keypad" },
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{ .compatible = "mediatek,mt6873-keypad" },
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{ /* sentinel */ }
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};
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static struct platform_driver mt6779_keypad_pdrv = {
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.probe = mt6779_keypad_pdrv_probe,
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.driver = {
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.name = MTK_KPD_NAME,
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.of_match_table = mt6779_keypad_of_match,
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},
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};
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module_platform_driver(mt6779_keypad_pdrv);
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MODULE_AUTHOR("Mediatek Corporation");
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MODULE_DESCRIPTION("MTK Keypad (KPD) Driver");
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MODULE_LICENSE("GPL");