Date:   Tue, 8 Aug 2023 15:25:01 +0800
From:   Wenhua Lin <Wenhua.Lin@...soc.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Nuno Sá <nuno.sa@...log.com>,
        Arnd Bergmann <arnd@...db.de>,
        Samuel Holland <samuel@...lland.org>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        Mattijs Korpershoek <mkorpershoek@...libre.com>,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
        Orson Zhai <orsonzhai@...il.com>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        Chunyan Zhang <zhang.lyra@...il.com>
CC:     <linux-serial@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        wenhua lin <wenhua.lin1994@...il.com>,
        Wenhua Lin <Wenhua.Lin@...soc.com>,
        Xiongpeng Wu <xiongpeng.wu@...soc.com>
Subject: [PATCH] input: keyboard: Add sprd-keypad driver

Add matrix keypad driver, support matrix keypad function.

Signed-off-by: Wenhua Lin <Wenhua.Lin@...soc.com>
---
 drivers/input/keyboard/Kconfig       |  10 +
 drivers/input/keyboard/Makefile      |   1 +
 drivers/input/keyboard/sprd_keypad.c | 418 +++++++++++++++++++++++++++
 3 files changed, 429 insertions(+)
 create mode 100644 drivers/input/keyboard/sprd_keypad.c

diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index 1d0c5f4c0f99..f35d9bf05f72 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -809,4 +809,14 @@ config KEYBOARD_CYPRESS_SF
 	  To compile this driver as a module, choose M here: the
 	  module will be called cypress-sf.
 
+config KEYBOARD_SPRD
+	tristate "Spreadtrum keyboard support"
+	depends on ARCH_SPRD || COMPILE_TEST
+	select INPUT_MATRIXKMAP
+	help
+	  Keypad controller is used to interface a SoC with a matrix-keypad device,
+	  The keypad controller supports multiple row and column lines.
+	  Say Y if you want to use the SPRD keyboard.
+	  Say M if you want to use the SPRD keyboard on SoC as module.
+
 endif
diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
index aecef00c5d09..b747112461b1 100644
--- a/drivers/input/keyboard/Makefile
+++ b/drivers/input/keyboard/Makefile
@@ -66,6 +66,7 @@ obj-$(CONFIG_KEYBOARD_STOWAWAY)		+= stowaway.o
 obj-$(CONFIG_KEYBOARD_ST_KEYSCAN)	+= st-keyscan.o
 obj-$(CONFIG_KEYBOARD_SUN4I_LRADC)	+= sun4i-lradc-keys.o
 obj-$(CONFIG_KEYBOARD_SUNKBD)		+= sunkbd.o
+obj-$(CONFIG_KEYBOARD_SPRD)		+= sprd_keypad.o
 obj-$(CONFIG_KEYBOARD_TC3589X)		+= tc3589x-keypad.o
 obj-$(CONFIG_KEYBOARD_TEGRA)		+= tegra-kbc.o
 obj-$(CONFIG_KEYBOARD_TM2_TOUCHKEY)	+= tm2-touchkey.o
diff --git a/drivers/input/keyboard/sprd_keypad.c b/drivers/input/keyboard/sprd_keypad.c
new file mode 100644
index 000000000000..5b88072831e8
--- /dev/null
+++ b/drivers/input/keyboard/sprd_keypad.c
@@ -0,0 +1,418 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018 Spreadtrum Communications Inc.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/input/matrix_keypad.h>
+#include <linux/io.h>
+#include <linux/interrupt.h>
+#include <linux/clk.h>
+#include <linux/of.h>
+#include <linux/input.h>
+
+#define SPRD_KPD_CTRL			0x0
+#define SPRD_KPD_INT_EN			0x4
+#define SPRD_KPD_INT_RAW_STATUS		0x8
+#define SPRD_KPD_INT_MASK_STATUS	0xc
+#define SPRD_KPD_INT_CLR		0x10
+#define SPRD_KPD_POLARITY		0x18
+#define SPRD_KPD_DEBOUNCE_CNT		0x1c
+#define SPRD_KPD_LONG_KEY_CNT		0x20
+#define SPRD_KPD_SLEEP_CNT		0x24
+#define SPRD_KPD_CLK_DIV_CNT		0x28
+#define SPRD_KPD_KEY_STATUS		0x2c
+#define SPRD_KPD_SLEEP_STATUS		0x30
+#define SPRD_KPD_DEBUG_STATUS1		0x34
+#define SPRD_KPD_DEBUG_STATUS2		0x38
+
+#define SPRD_KPD_EN			BIT(0)
+#define SPRD_KPD_SLEEP_EN		BIT(1)
+#define SPRD_KPD_LONG_KEY_EN		BIT(2)
+
+#define SPRD_KPD_ROWS_MSK		GENMASK(23, 16)
+#define SPRD_KPD_COLS_MSK		GENMASK(15, 8)
+
+#define SPRD_KPD_INT_ALL		GENMASK(11, 0)
+#define SPRD_KPD_INT_DOWNUP		GENMASK(7, 0)
+#define SPRD_KPD_INT_LONG		GENMASK(11, 8)
+
+#define SPRD_KPD_ROW_POLARITY		GENMASK(7, 0)
+#define SPRD_KPD_COL_POLARITY		GENMASK(15, 8)
+
+#define SPRD_KPD_PRESS_INTX(X, V) \
+	(((V) >> (X)) & GENMASK(0, 0))
+#define SPRD_KPD_RELEASE_INTX(X, V) \
+	(((V) >> ((X) + 4)) & GENMASK(0, 0))
+#define SPRD_KPD_INTX_COL(X, V) \
+	(((V) >> ((X) << 3)) & GENMASK(2, 0))
+#define SPRD_KPD_INTX_ROW(X, V) \
+	(((V) >> (((X) << 3) + 4)) & GENMASK(2, 0))
+#define SPRD_KPD_INTX_DOWN(X, V) \
+	(((V) >> (((X) << 3) + 7)) & GENMASK(0, 0))
+
+#define SPRD_KPD_RTC_HZ			32768
+#define SPRD_DEF_LONG_KEY_MS		1000
+#define SPRD_DEF_DIV_CNT		1
+#define SPRD_KPD_INT_CNT		4
+#define SPRD_KPD_ROWS_MAX		8
+#define SPRD_KPD_COLS_MAX		8
+#define SPRD_KPD_ROWS_SHIFT		16
+#define SPRD_KPD_COLS_SHIFT		8
+
+#define SPRD_CAP_WAKEUP			BIT(0)
+#define SPRD_CAP_LONG_KEY		BIT(1)
+#define SPRD_CAP_REPEAT			BIT(2)
+
+struct sprd_keypad_data {
+	u32 rows_en; /* enabled rows bits */
+	u32 cols_en; /* enabled cols bits */
+	u32 num_rows;
+	u32 num_cols;
+	u32 capabilities;
+	u32 debounce_ms;
+	void __iomem *base;
+	struct input_dev *input_dev;
+	struct clk *enable;
+	struct clk *rtc;
+};
+
+static int sprd_keypad_enable(struct sprd_keypad_data *data)
+{
+	struct device *dev = data->input_dev->dev.parent;
+	int ret;
+
+	ret = clk_prepare_enable(data->rtc);
+	if (ret) {
+		dev_err(dev, "enable rtc failed.\n");
+		return ret;
+	}
+
+	ret = clk_prepare_enable(data->enable);
+	if (ret) {
+		dev_err(dev, "enable keypad failed.\n");
+		clk_disable_unprepare(data->rtc);
+		return ret;
+	}
+
+	return 0;
+}
+
+static void sprd_keypad_disable(struct sprd_keypad_data *data)
+{
+	clk_disable_unprepare(data->enable);
+	clk_disable_unprepare(data->rtc);
+}
+
+static irqreturn_t sprd_keypad_handler(int irq, void *id)
+{
+	struct platform_device *pdev = id;
+	struct device *dev = &pdev->dev;
+	struct sprd_keypad_data *data = platform_get_drvdata(pdev);
+	u32 int_status = readl_relaxed(data->base + SPRD_KPD_INT_MASK_STATUS);
+	u32 key_status = readl_relaxed(data->base + SPRD_KPD_KEY_STATUS);
+	unsigned short *keycodes = data->input_dev->keycode;
+	u32 row_shift = get_count_order(data->num_cols);
+	unsigned short key;
+	int col, row;
+	u32 i;
+
+	writel_relaxed(SPRD_KPD_INT_ALL, data->base + SPRD_KPD_INT_CLR);
+
+	for (i = 0; i < SPRD_KPD_INT_CNT; i++) {
+		if (SPRD_KPD_PRESS_INTX(i, int_status)) {
+			col = SPRD_KPD_INTX_COL(i, key_status);
+			row = SPRD_KPD_INTX_ROW(i, key_status);
+			key = keycodes[MATRIX_SCAN_CODE(row, col, row_shift)];
+			input_report_key(data->input_dev, key, 1);
+			input_sync(data->input_dev);
+			dev_dbg(dev, "%dD\n", key);
+		}
+		if (SPRD_KPD_RELEASE_INTX(i, int_status)) {
+			col = SPRD_KPD_INTX_COL(i, key_status);
+			row = SPRD_KPD_INTX_ROW(i, key_status);
+			key = keycodes[MATRIX_SCAN_CODE(row, col, row_shift)];
+			input_report_key(data->input_dev, key, 0);
+			input_sync(data->input_dev);
+			dev_dbg(dev, "%dU\n", key);
+		}
+	}
+
+	return IRQ_HANDLED;
+}
+
+static u32 sprd_keypad_time_to_counter(u32 array_size, u32 time_ms)
+{
+	u32 value;
+
+	/*
+	 * y(ms) = (x + 1) * array_size
+	 *		/ (32.768 / (clk_div_num + 1))
+	 * y means time in ms
+	 * x means counter
+	 * array_size equal to rows * columns
+	 * clk_div_num is devider to keypad source clock
+	 **/
+	value = SPRD_KPD_RTC_HZ * time_ms;
+	value = value / (1000 * array_size *
+			(SPRD_DEF_DIV_CNT + 1));
+	if (value >= 1)
+		value -= 1;
+
+	return value;
+}
+
+static int sprd_keypad_hw_init(struct sprd_keypad_data *data)
+{
+	u32 value;
+
+	writel_relaxed(SPRD_KPD_INT_ALL, data->base + SPRD_KPD_INT_CLR);
+	writel_relaxed(SPRD_KPD_ROW_POLARITY | SPRD_KPD_COL_POLARITY,
+			data->base + SPRD_KPD_POLARITY);
+	writel_relaxed(SPRD_DEF_DIV_CNT, data->base + SPRD_KPD_CLK_DIV_CNT);
+
+	value = sprd_keypad_time_to_counter(data->num_rows * data->num_cols,
+						SPRD_DEF_LONG_KEY_MS);
+	writel_relaxed(value, data->base + SPRD_KPD_LONG_KEY_CNT);
+
+	value = sprd_keypad_time_to_counter(data->num_rows * data->num_cols,
+						data->debounce_ms);
+	writel_relaxed(value, data->base + SPRD_KPD_DEBOUNCE_CNT);
+
+	value = SPRD_KPD_INT_DOWNUP;
+	if (data->capabilities & SPRD_CAP_LONG_KEY)
+		value |= SPRD_KPD_INT_LONG;
+	writel_relaxed(value, data->base + SPRD_KPD_INT_EN);
+
+	value = SPRD_KPD_RTC_HZ - 1;
+	writel_relaxed(value, data->base + SPRD_KPD_SLEEP_CNT);
+
+	/* set enabled rows and columns */
+	value = (((data->rows_en << SPRD_KPD_ROWS_SHIFT)
+		| (data->cols_en << SPRD_KPD_COLS_SHIFT))
+		& (SPRD_KPD_ROWS_MSK | SPRD_KPD_COLS_MSK))
+		| SPRD_KPD_EN | SPRD_KPD_SLEEP_EN;
+	if (data->capabilities & SPRD_CAP_LONG_KEY)
+		value |= SPRD_KPD_LONG_KEY_EN;
+	writel_relaxed(value, data->base + SPRD_KPD_CTRL);
+
+	return 0;
+}
+
+static int __maybe_unused sprd_keypad_suspend(struct device *dev)
+{
+	struct sprd_keypad_data *data = dev_get_drvdata(dev);
+
+	if (!device_may_wakeup(dev))
+		sprd_keypad_disable(data);
+
+	return 0;
+}
+
+static int __maybe_unused sprd_keypad_resume(struct device *dev)
+{
+	struct sprd_keypad_data *data = dev_get_drvdata(dev);
+	int ret = 0;
+
+	if (!device_may_wakeup(dev)) {
+		ret = sprd_keypad_enable(data);
+		if (ret)
+			return ret;
+		ret = sprd_keypad_hw_init(data);
+	}
+
+	return ret;
+}
+
+static SIMPLE_DEV_PM_OPS(sprd_keypad_pm_ops,
+			sprd_keypad_suspend, sprd_keypad_resume);
+
+static int sprd_keypad_parse_dt(struct device *dev)
+{
+	struct sprd_keypad_data *data = dev_get_drvdata(dev);
+	struct device_node *np = dev->of_node;
+	int ret;
+
+	ret = matrix_keypad_parse_properties(dev, &data->num_rows, &data->num_cols);
+	if (ret)
+		return ret;
+
+	if (data->num_rows > SPRD_KPD_ROWS_MAX
+		|| data->num_cols > SPRD_KPD_COLS_MAX) {
+		dev_err(dev, "invalid num_rows or num_cols\n");
+		return -EINVAL;
+	}
+
+	ret = of_property_read_u32(np, "debounce-interval", &data->debounce_ms);
+	if (ret) {
+		data->debounce_ms = 5;
+		dev_warn(dev, "parse debounce-interval failed.\n");
+	}
+
+	if (of_get_property(np, "linux,repeat", NULL))
+		data->capabilities |= SPRD_CAP_REPEAT;
+	if (of_get_property(np, "sprd,support_long_key", NULL))
+		data->capabilities |= SPRD_CAP_LONG_KEY;
+	if (of_get_property(np, "wakeup-source", NULL))
+		data->capabilities |= SPRD_CAP_WAKEUP;
+
+	data->enable = devm_clk_get(dev, "enable");
+	if (IS_ERR(data->enable)) {
+		if (PTR_ERR(data->enable) != -EPROBE_DEFER)
+			dev_err(dev, "get enable clk failed.\n");
+		return PTR_ERR(data->enable);
+	}
+
+	data->rtc = devm_clk_get(dev, "rtc");
+	if (IS_ERR(data->rtc)) {
+		if (PTR_ERR(data->enable) != -EPROBE_DEFER)
+			dev_err(dev, "get rtc clk failed.\n");
+		return PTR_ERR(data->rtc);
+	}
+
+	return 0;
+}
+
+static int sprd_keypad_probe(struct platform_device *pdev)
+{
+	struct sprd_keypad_data *data;
+	struct resource *res;
+	int ret, irq, i, j, row_shift;
+	unsigned long rows, cols;
+	unsigned short *keycodes;
+
+	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	data->base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(data->base)) {
+		dev_err(&pdev->dev, "ioremap resource failed.\n");
+		ret =  PTR_ERR(data->base);
+		goto err_free;
+	}
+
+	platform_set_drvdata(pdev, data);
+	ret = sprd_keypad_parse_dt(&pdev->dev);
+	if (ret) {
+		dev_err(&pdev->dev, "keypad parse dts failed.\n");
+		goto err_free;
+	}
+
+	data->input_dev = devm_input_allocate_device(&pdev->dev);
+	if (IS_ERR(data->input_dev)) {
+		dev_err(&pdev->dev, "alloc input dev failed.\n");
+		ret =  PTR_ERR(data->input_dev);
+		goto err_free;
+	}
+
+	data->input_dev->name = "sprd-keypad";
+	data->input_dev->phys = "sprd-key/input0";
+
+	ret = matrix_keypad_build_keymap(NULL, NULL, data->num_rows,
+					 data->num_cols, NULL, data->input_dev);
+	if (ret) {
+		dev_err(&pdev->dev, "keypad build keymap failed.\n");
+		goto err_free;
+	}
+
+	rows = cols = 0;
+	row_shift = get_count_order(data->num_cols);
+	keycodes = data->input_dev->keycode;
+	for (i = 0; i < data->num_rows; i++) {
+		for (j = 0; j < data->num_cols; j++) {
+			if (!!keycodes[MATRIX_SCAN_CODE(i, j, row_shift)]) {
+				set_bit(i, &rows);
+				set_bit(j, &cols);
+			}
+		}
+	}
+	data->rows_en = rows;
+	data->cols_en = cols;
+
+	if (data->capabilities & SPRD_CAP_REPEAT)
+		set_bit(EV_REP, data->input_dev->evbit);
+
+	input_set_drvdata(data->input_dev, data);
+
+	ret = sprd_keypad_enable(data);
+	if (ret) {
+		dev_err(&pdev->dev, "keypad enable failed.\n");
+		goto err_free;
+	}
+
+	ret = sprd_keypad_hw_init(data);
+	if (ret) {
+		dev_err(&pdev->dev, "keypad hw init failed.\n");
+		goto clk_free;
+	}
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		dev_err(&pdev->dev, "platform get irq failed.\n");
+		goto clk_free;
+	}
+
+	ret = devm_request_irq(&pdev->dev, irq, sprd_keypad_handler,
+				IRQF_NO_SUSPEND, dev_name(&pdev->dev), pdev);
+	if (ret) {
+		dev_err(&pdev->dev, "request irq failed.\n");
+		goto clk_free;
+	}
+
+	ret = input_register_device(data->input_dev);
+	if (ret) {
+		dev_err(&pdev->dev, "register input dev failed\n");
+		goto clk_free;
+	}
+
+	if (data->capabilities & SPRD_CAP_WAKEUP)
+		device_init_wakeup(&pdev->dev, true);
+
+	return 0;
+
+clk_free:
+	sprd_keypad_disable(data);
+err_free:
+	devm_kfree(&pdev->dev, data);
+	return ret;
+}
+
+static int sprd_keypad_remove(struct platform_device *pdev)
+{
+	struct sprd_keypad_data *data = platform_get_drvdata(pdev);
+	int irq = platform_get_irq(pdev, 0);
+
+	if (data->capabilities & SPRD_CAP_WAKEUP)
+		device_init_wakeup(&pdev->dev, false);
+
+	input_unregister_device(data->input_dev);
+	devm_free_irq(&pdev->dev, irq, pdev);
+	sprd_keypad_disable(data);
+
+	return 0;
+}
+
+static const struct of_device_id sprd_keypad_match[] = {
+	{ .compatible = "sprd,sc9860-keypad", },
+	{},
+};
+
+static struct platform_driver sprd_keypad_driver = {
+	.driver = {
+		.name = "sprd-keypad",
+		.owner = THIS_MODULE,
+		.of_match_table = sprd_keypad_match,
+		.pm = &sprd_keypad_pm_ops,
+	},
+	.probe = sprd_keypad_probe,
+	.remove = sprd_keypad_remove,
+};
+
+module_platform_driver(sprd_keypad_driver);
+
+MODULE_DESCRIPTION("Spreadtrum KPD Driver");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Neo Hou <neo.hou@...soc.com>");
-- 
2.17.1

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