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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2022 MediaTek Inc.
* Author Fengping Yu <fengping.yu@mediatek.com>
*/
#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/input/matrix_keypad.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/property.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#define MTK_KPD_NAME "mt6779-keypad"
#define MTK_KPD_MEM 0x0004
#define MTK_KPD_DEBOUNCE 0x0018
#define MTK_KPD_DEBOUNCE_MASK GENMASK(13, 0)
#define MTK_KPD_DEBOUNCE_MAX_MS 256
#define MTK_KPD_SEL 0x0020
#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)
#define MTK_KPD_SEL_ROWMASK(r) GENMASK((r) + 3, 4)
#define MTK_KPD_NUM_MEMS 5
#define MTK_KPD_NUM_BITS 136 /* 4*32+8 MEM5 only use 8 BITS */
struct mt6779_keypad {
struct regmap *regmap;
struct input_dev *input_dev;
struct clk *clk;
u32 n_rows;
u32 n_cols;
DECLARE_BITMAP(keymap_state, MTK_KPD_NUM_BITS);
};
static const struct regmap_config mt6779_keypad_regmap_cfg = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = sizeof(u32),
.max_register = 36,
};
static irqreturn_t mt6779_keypad_irq_handler(int irq, void *dev_id)
{
struct mt6779_keypad *keypad = dev_id;
const unsigned short *keycode = keypad->input_dev->keycode;
DECLARE_BITMAP(new_state, MTK_KPD_NUM_BITS);
DECLARE_BITMAP(change, MTK_KPD_NUM_BITS);
unsigned int bit_nr, key;
unsigned int row, col;
unsigned int scancode;
unsigned int row_shift = get_count_order(keypad->n_cols);
bool pressed;
regmap_bulk_read(keypad->regmap, MTK_KPD_MEM,
new_state, MTK_KPD_NUM_MEMS);
bitmap_xor(change, new_state, keypad->keymap_state, MTK_KPD_NUM_BITS);
for_each_set_bit(bit_nr, change, MTK_KPD_NUM_BITS) {
/*
* Registers are 32bits, but only bits [15:0] are used to
* indicate key status.
*/
if (bit_nr % 32 >= 16)
continue;
key = bit_nr / 32 * 16 + bit_nr % 32;
row = key / 9;
col = key % 9;
scancode = MATRIX_SCAN_CODE(row, col, row_shift);
/* 1: not pressed, 0: pressed */
pressed = !test_bit(bit_nr, new_state);
dev_dbg(&keypad->input_dev->dev, "%s",
pressed ? "pressed" : "released");
input_event(keypad->input_dev, EV_MSC, MSC_SCAN, scancode);
input_report_key(keypad->input_dev, keycode[scancode], pressed);
input_sync(keypad->input_dev);
dev_dbg(&keypad->input_dev->dev,
"report Linux keycode = %d\n", keycode[scancode]);
}
bitmap_copy(keypad->keymap_state, new_state, MTK_KPD_NUM_BITS);
return IRQ_HANDLED;
}
static void mt6779_keypad_clk_disable(void *data)
{
clk_disable_unprepare(data);
}
static int mt6779_keypad_pdrv_probe(struct platform_device *pdev)
{
struct mt6779_keypad *keypad;
void __iomem *base;
int irq;
u32 debounce;
bool wakeup;
int error;
keypad = devm_kzalloc(&pdev->dev, sizeof(*keypad), GFP_KERNEL);
if (!keypad)
return -ENOMEM;
base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(base))
return PTR_ERR(base);
keypad->regmap = devm_regmap_init_mmio(&pdev->dev, base,
&mt6779_keypad_regmap_cfg);
if (IS_ERR(keypad->regmap)) {
dev_err(&pdev->dev,
"regmap init failed:%pe\n", keypad->regmap);
return PTR_ERR(keypad->regmap);
}
bitmap_fill(keypad->keymap_state, MTK_KPD_NUM_BITS);
keypad->input_dev = devm_input_allocate_device(&pdev->dev);
if (!keypad->input_dev) {
dev_err(&pdev->dev, "Failed to allocate input dev\n");
return -ENOMEM;
}
keypad->input_dev->name = MTK_KPD_NAME;
keypad->input_dev->id.bustype = BUS_HOST;
error = matrix_keypad_parse_properties(&pdev->dev, &keypad->n_rows,
&keypad->n_cols);
if (error) {
dev_err(&pdev->dev, "Failed to parse keypad params\n");
return error;
}
if (device_property_read_u32(&pdev->dev, "debounce-delay-ms",
&debounce))
debounce = 16;
if (debounce > MTK_KPD_DEBOUNCE_MAX_MS) {
dev_err(&pdev->dev,
"Debounce time exceeds the maximum allowed time %dms\n",
MTK_KPD_DEBOUNCE_MAX_MS);
return -EINVAL;
}
wakeup = device_property_read_bool(&pdev->dev, "wakeup-source");
dev_dbg(&pdev->dev, "n_row=%d n_col=%d debounce=%d\n",
keypad->n_rows, keypad->n_cols, debounce);
error = matrix_keypad_build_keymap(NULL, NULL,
keypad->n_rows, keypad->n_cols,
NULL, keypad->input_dev);
if (error) {
dev_err(&pdev->dev, "Failed to build keymap\n");
return error;
}
input_set_capability(keypad->input_dev, EV_MSC, MSC_SCAN);
regmap_write(keypad->regmap, MTK_KPD_DEBOUNCE,
(debounce * (1 << 5)) & MTK_KPD_DEBOUNCE_MASK);
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,
MTK_KPD_SEL_COLMASK(keypad->n_cols));
keypad->clk = devm_clk_get(&pdev->dev, "kpd");
if (IS_ERR(keypad->clk))
return PTR_ERR(keypad->clk);
error = clk_prepare_enable(keypad->clk);
if (error) {
dev_err(&pdev->dev, "cannot prepare/enable keypad clock\n");
return error;
}
error = devm_add_action_or_reset(&pdev->dev, mt6779_keypad_clk_disable,
keypad->clk);
if (error)
return error;
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
error = devm_request_threaded_irq(&pdev->dev, irq,
NULL, mt6779_keypad_irq_handler,
IRQF_ONESHOT, MTK_KPD_NAME, keypad);
if (error) {
dev_err(&pdev->dev, "Failed to request IRQ#%d: %d\n",
irq, error);
return error;
}
error = input_register_device(keypad->input_dev);
if (error) {
dev_err(&pdev->dev, "Failed to register device\n");
return error;
}
error = device_init_wakeup(&pdev->dev, wakeup);
if (error)
dev_warn(&pdev->dev, "device_init_wakeup() failed: %d\n",
error);
return 0;
}
static const struct of_device_id mt6779_keypad_of_match[] = {
{ .compatible = "mediatek,mt6779-keypad" },
{ .compatible = "mediatek,mt6873-keypad" },
{ /* sentinel */ }
};
static struct platform_driver mt6779_keypad_pdrv = {
.probe = mt6779_keypad_pdrv_probe,
.driver = {
.name = MTK_KPD_NAME,
.of_match_table = mt6779_keypad_of_match,
},
};
module_platform_driver(mt6779_keypad_pdrv);
MODULE_AUTHOR("Mediatek Corporation");
MODULE_DESCRIPTION("MTK Keypad (KPD) Driver");
MODULE_LICENSE("GPL");
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