From: mjchen <mjchen@xxxxxxxxxxx>
Adds a new keypad driver for the MA35D1 platform.
The driver supports key scanning and interrupt handling.
Signed-off-by: mjchen <mjchen@xxxxxxxxxxx>
---
drivers/input/keyboard/Kconfig | 10 +
drivers/input/keyboard/Makefile | 1 +
drivers/input/keyboard/ma35d1_keypad.c | 312 +++++++++++++++++++++++++
3 files changed, 323 insertions(+)
create mode 100644 drivers/input/keyboard/ma35d1_keypad.c
diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index 721ab69e84ac..ce9bd5cc13a1 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -797,4 +797,14 @@ config KEYBOARD_CYPRESS_SF
To compile this driver as a module, choose M here: the
module will be called cypress-sf.
+config KEYBOARD_MA35D1
+ tristate "Nuvoton MA35D1 keypad driver"
+ depends on ARCH_MA35
+ select INPUT_MATRIXKMAP
+ help
+ Say Y here if you want to use Nuvoton MA35D1 keypad.
+
+ To compile this driver as a module, choose M here: the
+ module will be called ma35d1-keypad.
+
endif
diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
index 1e0721c30709..9b858cdd1b6b 100644
--- a/drivers/input/keyboard/Makefile
+++ b/drivers/input/keyboard/Makefile
@@ -70,3 +70,4 @@ obj-$(CONFIG_KEYBOARD_TEGRA) += tegra-kbc.o
obj-$(CONFIG_KEYBOARD_TM2_TOUCHKEY) += tm2-touchkey.o
obj-$(CONFIG_KEYBOARD_TWL4030) += twl4030_keypad.o
obj-$(CONFIG_KEYBOARD_XTKBD) += xtkbd.o
+obj-$(CONFIG_KEYBOARD_MA35D1) += ma35d1_keypad.o
diff --git a/drivers/input/keyboard/ma35d1_keypad.c b/drivers/input/keyboard/ma35d1_keypad.c
new file mode 100644
index 000000000000..20b5b1b91127
--- /dev/null
+++ b/drivers/input/keyboard/ma35d1_keypad.c
@@ -0,0 +1,312 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * MA35D1 keypad driver
+ * Copyright (C) 2024 Nuvoton Technology Corp.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/input.h>
+#include <linux/platform_device.h>
+#include <linux/input/matrix_keypad.h>
+#include <linux/clk.h>
+#include <linux/of.h>
+
+/* Keypad Interface Registers */
+#define KPI_CONF 0x00
+#define KPI_3KCONF 0x04
+#define KPI_STATUS 0x08
+#define KPI_RSTC 0x0C
+#define KPI_KEST 0x10
+#define KPI_KPE0 0x18
+#define KPI_KPE1 0x1C
+#define KPI_KRE0 0x20
+#define KPI_KRE1 0x24
+#define KPI_PRESCALDIV 0x28
+
+/* KPI_CONF - Keypad Configuration Register */
+#define KROW GENMASK(30, 28) /* Keypad Matrix ROW number */
+#define KCOL GENMASK(26, 24) /* Keypad Matrix COL Number */
+#define DB_CLKSEL GENMASK(19, 16) /* De-bounce sampling cycle selection */
+#define PRESCALE GENMASK(15, 8) /* Row Scan Cycle Pre-scale Value */
+#define WAKEUP BIT(5) /* Lower Power Wakeup Enable */
+#define INTEN BIT(3) /* Key Interrupt Enable Control */
+#define RKINTEN BIT(2) /* Release Key Interrupt Enable */
+#define PKINTEN BIT(1) /* Press Key Interrupt Enable Control */
+#define ENKP BIT(0) /* Keypad Scan Enable */
+
+/* KPI_STATUS - Keypad Status Register */
+#define PKEY_INT BIT(4) /* Press key interrupt */
+#define RKEY_INT BIT(3) /* Release key interrupt */
+#define KEY_INT BIT(2) /* Key Interrupt */
+#define RST_3KEY BIT(1) /* 3-Keys Reset Flag */
+#define PDWAKE BIT(0) /* Power Down Wakeup Flag */
+
+#define DEFAULT_DEBOUNCE 1
+#define DEFAULT_PRE_SCALE 1
+#define DEFAULT_PRE_SCALEDIV 32
+
+struct ma35d1_keypad {
+ struct clk *clk;
+ struct input_dev *input_dev;
+ void __iomem *mmio_base;
+ int irq;
+ unsigned int kpi_row;
+ unsigned int kpi_col;
+ unsigned int debounce_val;
+ unsigned int pre_scale;
+ unsigned int pre_scale_divider;
+};
+
+static void ma35d1_keypad_scan_matrix(struct ma35d1_keypad *keypad, unsigned int status)
+{
+ struct input_dev *input_dev = keypad->input_dev;
+ unsigned int i, j;
+ unsigned int row_add = 0;
+ unsigned int code;
+ unsigned int key;
+ unsigned int press_key;
+ unsigned long KeyEvent[4];
+ unsigned int row_shift = get_count_order(keypad->kpi_col);
+ unsigned short *keymap = input_dev->keycode;
+
+ /* Read key event status */
+ KeyEvent[0] = readl(keypad->mmio_base + KPI_KPE0);
+ KeyEvent[1] = readl(keypad->mmio_base + KPI_KPE1);
+ KeyEvent[2] = readl(keypad->mmio_base + KPI_KRE0);
+ KeyEvent[3] = readl(keypad->mmio_base + KPI_KRE1);
+
+ /* Clear key event status */
+ writel(KeyEvent[0], (keypad->mmio_base + KPI_KPE0));
+ writel(KeyEvent[1], (keypad->mmio_base + KPI_KPE1));
+ writel(KeyEvent[2], (keypad->mmio_base + KPI_KRE0));
+ writel(KeyEvent[3], (keypad->mmio_base + KPI_KRE1));
+
+ for (j = 0; j < 4; j++) {
+ if (KeyEvent[j] != 0) {
+ row_add = (j % 2) ? 4 : 0;
+ press_key = (j < 2) ? 1 : 0;
+
+ for (i = 0; i < 32; i++) {
+ if (KeyEvent[j] & (1<<i)) {
+ code = MATRIX_SCAN_CODE(((i/8) + row_add), (i % 8), row_shift);
+ key = keymap[code];
+
+ input_event(input_dev, EV_MSC, MSC_SCAN, code);
+ input_report_key(input_dev, key, press_key);
+ }
+ }
+ }
+ }
+
+ input_sync(input_dev);
+}
+
+static irqreturn_t ma35d1_keypad_interrupt(int irq, void *dev_id)
+{
+ struct ma35d1_keypad *keypad = dev_id;
+ unsigned int kstatus;
+
+ kstatus = readl(keypad->mmio_base + KPI_STATUS);
+
+ if (kstatus & (PKEY_INT|RKEY_INT)) {
+ ma35d1_keypad_scan_matrix(keypad, kstatus);
+ } else {
+ if (kstatus & PDWAKE)
+ writel(PDWAKE, (keypad->mmio_base + KPI_STATUS));
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int ma35d1_keypad_open(struct input_dev *dev)
+{
+ struct ma35d1_keypad *keypad = input_get_drvdata(dev);
+ unsigned int val, config;
+
+ val = RKINTEN | PKINTEN | INTEN | ENKP;
+ val |= FIELD_PREP(KCOL, (keypad->kpi_col - 1)) | FIELD_PREP(KROW, (keypad->kpi_row - 1));
+
+ if (keypad->debounce_val > 0)
+ config = FIELD_PREP(PRESCALE, (keypad->pre_scale - 1)) |
+ FIELD_PREP(DB_CLKSEL, keypad->debounce_val);
+ else
+ config = FIELD_PREP(PRESCALE, (keypad->pre_scale - 1));
+
+ val |= config;
+
+ writel(val, keypad->mmio_base + KPI_CONF);
+ writel((keypad->pre_scale_divider - 1), keypad->mmio_base + KPI_PRESCALDIV);
+
+ return 0;
+}
+
+static void ma35d1_keypad_close(struct input_dev *dev)
+{
+ struct ma35d1_keypad *keypad = input_get_drvdata(dev);
+
+ clk_disable(keypad->clk);
+}
+
+static int ma35d1_keypad_probe(struct platform_device *pdev)
+{
+ struct ma35d1_keypad *keypad;
+ struct input_dev *input_dev;
+ struct resource *res;
+ int error = 0;
+
+ keypad = devm_kzalloc(&pdev->dev, sizeof(*keypad), GFP_KERNEL);
+ if (!keypad)
+ return -ENOMEM;
+
+
+ input_dev = input_allocate_device();
+ if (!input_dev) {
+ dev_err(&pdev->dev, "failed to allocate input device\n");
+ return -ENOMEM;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "failed to get I/O memory\n");
+ error = -ENXIO;
+ goto failed_free_input;
+ }
+
+ keypad->mmio_base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(keypad->mmio_base)) {
+ dev_err(&pdev->dev, "failed to remap I/O memory\n");
+ return PTR_ERR(keypad->mmio_base);
+ }
+
+ keypad->irq = platform_get_irq(pdev, 0);
+ if (keypad->irq < 0) {
+ dev_err(&pdev->dev, "failed to get IRQ\n");
+ return keypad->irq;
+ }
+
+ keypad->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(keypad->clk)) {
+ dev_err(&pdev->dev, "failed to get core clk: %ld\n", PTR_ERR(keypad->clk));
+ return PTR_ERR(keypad->clk);
+ }
+
+ error = matrix_keypad_parse_properties(&pdev->dev,
+ &(keypad->kpi_row),
+ &(keypad->kpi_col));
+ if (error) {
+ dev_err(&pdev->dev, "failed to parse kp params\n");
+ return error;
+ }
+
+ error = matrix_keypad_build_keymap(NULL, NULL,
+ keypad->kpi_row,
+ keypad->kpi_col,
+ NULL, input_dev);
+ if (error) {
+ dev_err(&pdev->dev, "failed to build keymap\n");
+ return error;
+ }
+
+ keypad->input_dev = input_dev;
+ input_dev->name = pdev->name;
+ input_dev->id.bustype = BUS_HOST;
+ input_dev->open = ma35d1_keypad_open;
+ input_dev->close = ma35d1_keypad_close;
+ input_dev->dev.parent = &pdev->dev;
+
+ if (of_property_read_u32(pdev->dev.of_node, "debounce-period", &(keypad->debounce_val)))
+ keypad->debounce_val = DEFAULT_DEBOUNCE;
+
+ if (of_property_read_u32(pdev->dev.of_node, "per-scale", &(keypad->pre_scale)))
+ keypad->pre_scale = DEFAULT_PRE_SCALE;
+
+ if (of_property_read_u32(pdev->dev.of_node, "per-scalediv", &(keypad->pre_scale_divider)))
+ keypad->pre_scale_divider = DEFAULT_PRE_SCALEDIV;
+
+ __set_bit(EV_REP, input_dev->evbit);
+ input_set_drvdata(input_dev, keypad);
+ input_set_capability(input_dev, EV_MSC, MSC_SCAN);
+
+ error = input_register_device(input_dev);
+ if (error) {
+ dev_err(&pdev->dev, "failed to register input device\n");
+ goto failed_free_input;
+ }
+
+ error = devm_request_irq(&pdev->dev, keypad->irq,
+ ma35d1_keypad_interrupt,
+ IRQF_NO_SUSPEND, pdev->name, keypad);
+ if (error) {
+ dev_err(&pdev->dev, "failed to request IRQ\n");
+ goto failed_unregister_input;
+ }
+
+ platform_set_drvdata(pdev, keypad);
+ device_init_wakeup(&pdev->dev, 1);
+ clk_prepare_enable(keypad->clk);
+
+ return 0;
+
+failed_unregister_input:
+ input_unregister_device(input_dev);
+failed_free_input:
+ input_free_device(input_dev);
+ return error;
+}
+
+static void ma35d1_keypad_remove(struct platform_device *pdev)
+{
+ struct ma35d1_keypad *keypad = platform_get_drvdata(pdev);
+
+ input_unregister_device(keypad->input_dev);
+ clk_disable_unprepare(keypad->clk);
+}
+
+static int ma35d1_keypad_suspend(struct platform_device *pdev,
+ pm_message_t state)
+{
+ struct ma35d1_keypad *keypad = platform_get_drvdata(pdev);
+
+ if (device_may_wakeup(&pdev->dev)) {
+ writel(readl(keypad->mmio_base + KPI_CONF) | WAKEUP, keypad->mmio_base + KPI_CONF);
+ enable_irq_wake(keypad->irq);
+ }
+
+ return 0;
+}
+
+static int ma35d1_keypad_resume(struct platform_device *pdev)
+{
+ struct ma35d1_keypad *keypad = platform_get_drvdata(pdev);
+
+ if (device_may_wakeup(&pdev->dev)) {
+ writel(readl(keypad->mmio_base + KPI_CONF) & ~(WAKEUP),
+ keypad->mmio_base + KPI_CONF);
+ disable_irq_wake(keypad->irq);
+ }
+
+ return 0;
+}
+
+static const struct of_device_id ma35d1_kpi_of_match[] = {
+ { .compatible = "nuvoton,ma35d1-kpi"},
+ {},
+};
+MODULE_DEVICE_TABLE(of, ma35d1_kpi_of_match);
+
+static struct platform_driver ma35d1_keypad_driver = {
+ .probe = ma35d1_keypad_probe,
+ .remove = ma35d1_keypad_remove,
+ .suspend = ma35d1_keypad_suspend,
+ .resume = ma35d1_keypad_resume,
+ .driver = {
+ .name = "ma35d1-kpi",
+ .of_match_table = of_match_ptr(ma35d1_kpi_of_match),
+ },
+};
+module_platform_driver(ma35d1_keypad_driver);
+
+MODULE_AUTHOR("Ming-Jen Chen");
+MODULE_DESCRIPTION("MA35D1 Keypad Driver");
+MODULE_LICENSE("GPL");
+
--
2.17.1
