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[60.250.192.107]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2e5ad355bebsm5227508a91.7.2024.10.21.23.32.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 21 Oct 2024 23:32:11 -0700 (PDT) From: mjchen To: linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-input@vger.kernel.org, linux-arm-kernel@lists.infradead.org, mjchen0829@gmail.com, mjchen@nuvoton.com, peng.fan@nxp.com, sudeep.holla@arm.com, arnd@arndb.de, conor+dt@kernel.org, krzk+dt@kernel.org, robh@kernel.org, dmitry.torokhov@gmail.com Subject: [PATCH 2/2] input: keypad: add new keypad driver for MA35D1 Date: Tue, 22 Oct 2024 06:31:58 +0000 Message-Id: <20241022063158.5910-3-mjchen0829@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20241022063158.5910-1-mjchen0829@gmail.com> References: <20241022063158.5910-1-mjchen0829@gmail.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241021_233213_605907_5585ADED X-CRM114-Status: GOOD ( 29.46 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: mjchen Adds a new keypad driver for the MA35D1 platform. The driver supports key scanning and interrupt handling. Signed-off-by: mjchen --- 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 +#include +#include +#include +#include +#include + +/* 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<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"); +