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[60.250.192.107]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-20e7f0f6e89sm68503615ad.277.2024.10.24.01.59.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 24 Oct 2024 01:59:53 -0700 (PDT) From: Ming Yu X-Google-Original-From: Ming Yu To: tmyu0@nuvoton.com, lee@kernel.org, linus.walleij@linaro.org, brgl@bgdev.pl, andi.shyti@kernel.org, mkl@pengutronix.de, mailhol.vincent@wanadoo.fr, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, wim@linux-watchdog.org, linux@roeck-us.net, jdelvare@suse.com, jic23@kernel.org, lars@metafoo.de, ukleinek@kernel.org, alexandre.belloni@bootlin.com Cc: linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org, linux-i2c@vger.kernel.org, linux-can@vger.kernel.org, netdev@vger.kernel.org, linux-watchdog@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-iio@vger.kernel.org, linux-pwm@vger.kernel.org, linux-rtc@vger.kernel.org Subject: [PATCH v1 2/9] gpio: Add Nuvoton NCT6694 GPIO support Date: Thu, 24 Oct 2024 16:59:15 +0800 Message-Id: <20241024085922.133071-3-tmyu0@nuvoton.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241024085922.133071-1-tmyu0@nuvoton.com> References: <20241024085922.133071-1-tmyu0@nuvoton.com> Precedence: bulk X-Mailing-List: linux-watchdog@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 This driver supports GPIO and IRQ functionality for NCT6694 MFD device based on USB interface. Signed-off-by: Ming Yu --- MAINTAINERS | 1 + drivers/gpio/Kconfig | 12 + drivers/gpio/Makefile | 1 + drivers/gpio/gpio-nct6694.c | 489 ++++++++++++++++++++++++++++++++++++ 4 files changed, 503 insertions(+) create mode 100644 drivers/gpio/gpio-nct6694.c diff --git a/MAINTAINERS b/MAINTAINERS index 30157ca95cf3..2c86d5dab3f1 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -16438,6 +16438,7 @@ NUVOTON NCT6694 MFD DRIVER M: Ming Yu L: linux-kernel@vger.kernel.org S: Supported +F: drivers/gpio/gpio-nct6694.c F: drivers/mfd/nct6694.c F: include/linux/mfd/nct6694.h diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index d93cd4f722b4..aa78ad9ff4ac 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -1450,6 +1450,18 @@ config GPIO_MAX77650 GPIO driver for MAX77650/77651 PMIC from Maxim Semiconductor. These chips have a single pin that can be configured as GPIO. +config GPIO_NCT6694 + tristate "Nuvoton NCT6694 GPIO controller support" + depends on MFD_NCT6694 + select GENERIC_IRQ_CHIP + select GPIOLIB_IRQCHIP + help + This driver supports 8 GPIO pins per bank that can all be interrupt + sources. + + This driver can also be built as a module. If so, the module will be + called gpio-nct6694. + config GPIO_PALMAS bool "TI PALMAS series PMICs GPIO" depends on MFD_PALMAS diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 1429e8c0229b..02c94aa28017 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -121,6 +121,7 @@ obj-$(CONFIG_GPIO_MXC) += gpio-mxc.o obj-$(CONFIG_GPIO_MXS) += gpio-mxs.o obj-$(CONFIG_GPIO_NOMADIK) += gpio-nomadik.o obj-$(CONFIG_GPIO_NPCM_SGPIO) += gpio-npcm-sgpio.o +obj-$(CONFIG_GPIO_NCT6694) += gpio-nct6694.o obj-$(CONFIG_GPIO_OCTEON) += gpio-octeon.o obj-$(CONFIG_GPIO_OMAP) += gpio-omap.o obj-$(CONFIG_GPIO_PALMAS) += gpio-palmas.o diff --git a/drivers/gpio/gpio-nct6694.c b/drivers/gpio/gpio-nct6694.c new file mode 100644 index 000000000000..42c0e6e76730 --- /dev/null +++ b/drivers/gpio/gpio-nct6694.c @@ -0,0 +1,489 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Nuvoton NCT6694 GPIO controller driver based on USB interface. + * + * Copyright (C) 2024 Nuvoton Technology Corp. + */ + +#include +#include +#include +#include +#include +#include +#include + +#define DRVNAME "nct6694-gpio" + +/* Host interface */ +#define REQUEST_GPIO_MOD 0xFF +#define REQUEST_GPIO_LEN 0x01 + +/* Report Channel */ +#define GPIO_VER_REG 0x90 +#define GPIO_VALID_REG 0x110 +#define GPI_DATA_REG 0x120 +#define GPO_DIR_REG 0x170 +#define GPO_TYPE_REG 0x180 +#define GPO_DATA_REG 0x190 + +#define GPI_STS_REG 0x130 +#define GPI_CLR_REG 0x140 +#define GPI_FALLING_REG 0x150 +#define GPI_RISING_REG 0x160 + +struct nct6694_gpio_data { + struct nct6694 *nct6694; + struct gpio_chip gpio; + struct work_struct irq_work; + struct work_struct irq_trig_work; + + /* Protect irq operation */ + struct mutex irq_lock; + + unsigned char irq_trig_falling; + unsigned char irq_trig_rising; + + /* Current gpio group */ + unsigned char group; +}; + +static int nct6694_get_direction(struct gpio_chip *gpio, unsigned int offset) +{ + struct nct6694_gpio_data *data = gpiochip_get_data(gpio); + unsigned char buf; + int ret; + + ret = nct6694_read_msg(data->nct6694, REQUEST_GPIO_MOD, + GPO_DIR_REG + data->group, + REQUEST_GPIO_LEN, 0, 1, &buf); + if (ret < 0) + return ret; + + return !(BIT(offset) & buf); +} + +static int nct6694_direction_input(struct gpio_chip *gpio, unsigned int offset) +{ + struct nct6694_gpio_data *data = gpiochip_get_data(gpio); + unsigned char buf; + int ret; + + ret = nct6694_read_msg(data->nct6694, REQUEST_GPIO_MOD, + GPO_DIR_REG + data->group, + REQUEST_GPIO_LEN, 0, 1, &buf); + if (ret < 0) + return ret; + + buf &= ~(1 << offset); + + ret = nct6694_write_msg(data->nct6694, REQUEST_GPIO_MOD, + GPO_DIR_REG + data->group, + REQUEST_GPIO_LEN, &buf); + + return ret; +} + +static int nct6694_direction_output(struct gpio_chip *gpio, + unsigned int offset, int val) +{ + struct nct6694_gpio_data *data = gpiochip_get_data(gpio); + unsigned char buf; + int ret; + + /* Set direction to output */ + ret = nct6694_read_msg(data->nct6694, REQUEST_GPIO_MOD, + GPO_DIR_REG + data->group, + REQUEST_GPIO_LEN, 0, 1, &buf); + if (ret < 0) + return ret; + + buf |= (1 << offset); + ret = nct6694_write_msg(data->nct6694, REQUEST_GPIO_MOD, + GPO_DIR_REG + data->group, + REQUEST_GPIO_LEN, &buf); + if (ret < 0) + return ret; + + /* Then set output level */ + ret = nct6694_read_msg(data->nct6694, 0xFF, + GPO_DATA_REG + data->group, + REQUEST_GPIO_LEN, 0, 1, &buf); + if (ret < 0) + return ret; + + if (val) + buf |= (1 << offset); + else + buf &= ~(1 << offset); + + ret = nct6694_write_msg(data->nct6694, REQUEST_GPIO_MOD, + GPO_DATA_REG + data->group, + REQUEST_GPIO_LEN, &buf); + + return ret; +} + +static int nct6694_get_value(struct gpio_chip *gpio, unsigned int offset) +{ + struct nct6694_gpio_data *data = gpiochip_get_data(gpio); + unsigned char buf; + int ret; + + ret = nct6694_read_msg(data->nct6694, REQUEST_GPIO_MOD, + GPO_DIR_REG + data->group, + REQUEST_GPIO_LEN, 0, 1, &buf); + if (ret < 0) + return ret; + + if (BIT(offset) & buf) { + ret = nct6694_read_msg(data->nct6694, REQUEST_GPIO_MOD, + GPO_DATA_REG + data->group, + REQUEST_GPIO_LEN, 0, 1, &buf); + if (ret < 0) + return ret; + + return !!(BIT(offset) & buf); + } + + ret = nct6694_read_msg(data->nct6694, REQUEST_GPIO_MOD, + GPI_DATA_REG + data->group, + REQUEST_GPIO_LEN, 0, 1, &buf); + if (ret < 0) + return ret; + + return !!(BIT(offset) & buf); +} + +static void nct6694_set_value(struct gpio_chip *gpio, unsigned int offset, + int val) +{ + struct nct6694_gpio_data *data = gpiochip_get_data(gpio); + unsigned char buf; + + nct6694_read_msg(data->nct6694, REQUEST_GPIO_MOD, + GPO_DATA_REG + data->group, + REQUEST_GPIO_LEN, 0, 1, &buf); + + if (val) + buf |= (1 << offset); + else + buf &= ~(1 << offset); + + nct6694_write_msg(data->nct6694, REQUEST_GPIO_MOD, + GPO_DATA_REG + data->group, + REQUEST_GPIO_LEN, &buf); +} + +static int nct6694_set_config(struct gpio_chip *gpio, unsigned int offset, + unsigned long config) +{ + struct nct6694_gpio_data *data = gpiochip_get_data(gpio); + unsigned char buf; + int ret; + + ret = nct6694_read_msg(data->nct6694, REQUEST_GPIO_MOD, + GPO_TYPE_REG + data->group, + REQUEST_GPIO_LEN, 0, 1, &buf); + if (ret < 0) + return ret; + + switch (pinconf_to_config_param(config)) { + case PIN_CONFIG_DRIVE_OPEN_DRAIN: + buf |= (1 << offset); + break; + case PIN_CONFIG_DRIVE_PUSH_PULL: + buf &= ~(1 << offset); + break; + default: + return -EOPNOTSUPP; + } + + ret = nct6694_write_msg(data->nct6694, REQUEST_GPIO_MOD, + GPO_TYPE_REG + data->group, + REQUEST_GPIO_LEN, &buf); + + return ret; +} + +static int nct6694_init_valid_mask(struct gpio_chip *gpio, + unsigned long *valid_mask, + unsigned int ngpios) +{ + struct nct6694_gpio_data *data = gpiochip_get_data(gpio); + unsigned char buf; + int ret; + + ret = nct6694_read_msg(data->nct6694, REQUEST_GPIO_MOD, + GPIO_VALID_REG + data->group, + REQUEST_GPIO_LEN, 0, 1, &buf); + if (ret < 0) + return ret; + + *valid_mask = buf; + + return ret; +} + +static void nct6694_irq(struct work_struct *irq_work) +{ + struct nct6694_gpio_data *data; + unsigned char status; + + data = container_of(irq_work, struct nct6694_gpio_data, irq_work); + + nct6694_read_msg(data->nct6694, REQUEST_GPIO_MOD, + GPI_STS_REG + data->group, 1, + 0, 1, &status); + + while (status) { + int bit = __ffs(status); + unsigned char val = BIT(bit); + + handle_nested_irq(irq_find_mapping(data->gpio.irq.domain, bit)); + status &= ~(1 << bit); + nct6694_write_msg(data->nct6694, REQUEST_GPIO_MOD, + GPI_CLR_REG + data->group, + REQUEST_GPIO_LEN, &val); + } +} + +static void nct6694_gpio_handler(void *private_data) +{ + struct nct6694_gpio_data *data = private_data; + struct nct6694 *nct6694 = data->nct6694; + + queue_work(nct6694->async_workqueue, &data->irq_work); +} + +static int nct6694_get_irq_trig(struct nct6694_gpio_data *data) +{ + int ret; + + ret = nct6694_read_msg(data->nct6694, REQUEST_GPIO_MOD, + GPI_FALLING_REG + data->group, + 1, 0, 1, &data->irq_trig_falling); + if (ret) + return ret; + + ret = nct6694_read_msg(data->nct6694, REQUEST_GPIO_MOD, + GPI_RISING_REG + data->group, + 1, 0, 1, &data->irq_trig_rising); + + return ret; +} + +static void nct6694_irq_mask(struct irq_data *d) +{ + struct gpio_chip *gpio = irq_data_get_irq_chip_data(d); + irq_hw_number_t hwirq = irqd_to_hwirq(d); + + gpiochip_disable_irq(gpio, hwirq); +} + +static void nct6694_irq_unmask(struct irq_data *d) +{ + struct gpio_chip *gpio = irq_data_get_irq_chip_data(d); + irq_hw_number_t hwirq = irqd_to_hwirq(d); + + gpiochip_enable_irq(gpio, hwirq); +} + +static void nct6694_irq_trig(struct work_struct *irq_trig_work) +{ + struct nct6694_gpio_data *data; + + data = container_of(irq_trig_work, struct nct6694_gpio_data, + irq_trig_work); + + nct6694_write_msg(data->nct6694, REQUEST_GPIO_MOD, + GPI_FALLING_REG + data->group, + 1, &data->irq_trig_falling); + + nct6694_write_msg(data->nct6694, REQUEST_GPIO_MOD, + GPI_RISING_REG + data->group, + 1, &data->irq_trig_rising); +} + +static int nct6694_irq_set_type(struct irq_data *d, unsigned int type) +{ + struct gpio_chip *gpio = irq_data_get_irq_chip_data(d); + struct nct6694_gpio_data *data = gpiochip_get_data(gpio); + struct nct6694 *nct6694 = data->nct6694; + irq_hw_number_t hwirq = irqd_to_hwirq(d); + + switch (type) { + case IRQ_TYPE_EDGE_RISING: + data->irq_trig_rising |= BIT(hwirq); + break; + + case IRQ_TYPE_EDGE_FALLING: + data->irq_trig_falling |= BIT(hwirq); + break; + + case IRQ_TYPE_EDGE_BOTH: + data->irq_trig_rising |= BIT(hwirq); + data->irq_trig_falling |= BIT(hwirq); + break; + + default: + return -EOPNOTSUPP; + } + + queue_work(nct6694->async_workqueue, &data->irq_trig_work); + + return 0; +} + +static void nct6694_irq_bus_lock(struct irq_data *d) +{ + struct gpio_chip *gpio = irq_data_get_irq_chip_data(d); + struct nct6694_gpio_data *data = gpiochip_get_data(gpio); + + mutex_lock(&data->irq_lock); +} + +static void nct6694_irq_bus_sync_unlock(struct irq_data *d) +{ + struct gpio_chip *gpio = irq_data_get_irq_chip_data(d); + struct nct6694_gpio_data *data = gpiochip_get_data(gpio); + + mutex_unlock(&data->irq_lock); +} + +static const struct irq_chip nct6694_irq_chip = { + .name = "nct6694", + .irq_mask = nct6694_irq_mask, + .irq_unmask = nct6694_irq_unmask, + .irq_set_type = nct6694_irq_set_type, + .irq_bus_lock = nct6694_irq_bus_lock, + .irq_bus_sync_unlock = nct6694_irq_bus_sync_unlock, + .flags = IRQCHIP_IMMUTABLE, + GPIOCHIP_IRQ_RESOURCE_HELPERS, +}; + +static const char * const nct6694_gpio_name[] = { + "NCT6694-GPIO0", + "NCT6694-GPIO1", + "NCT6694-GPIO2", + "NCT6694-GPIO3", + "NCT6694-GPIO4", + "NCT6694-GPIO5", + "NCT6694-GPIO6", + "NCT6694-GPIO7", + "NCT6694-GPIO8", + "NCT6694-GPIO9", + "NCT6694-GPIOA", + "NCT6694-GPIOB", + "NCT6694-GPIOC", + "NCT6694-GPIOD", + "NCT6694-GPIOE", + "NCT6694-GPIOF", +}; + +static int nct6694_gpio_probe(struct platform_device *pdev) +{ + const struct mfd_cell *cell = mfd_get_cell(pdev); + struct nct6694 *nct6694 = dev_get_drvdata(pdev->dev.parent); + struct nct6694_gpio_data *data; + struct gpio_irq_chip *girq; + int ret; + + data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->nct6694 = nct6694; + data->group = cell->id; + + data->gpio.label = nct6694_gpio_name[cell->id]; + data->gpio.direction_input = nct6694_direction_input; + data->gpio.get = nct6694_get_value; + data->gpio.direction_output = nct6694_direction_output; + data->gpio.set = nct6694_set_value; + data->gpio.get_direction = nct6694_get_direction; + data->gpio.set_config = nct6694_set_config; + data->gpio.init_valid_mask = nct6694_init_valid_mask; + data->gpio.base = -1; + data->gpio.can_sleep = false; + data->gpio.owner = THIS_MODULE; + data->gpio.ngpio = 8; + + INIT_WORK(&data->irq_work, nct6694_irq); + INIT_WORK(&data->irq_trig_work, nct6694_irq_trig); + mutex_init(&data->irq_lock); + + ret = nct6694_register_handler(nct6694, GPIO_IRQ_STATUS, + nct6694_gpio_handler, data); + if (ret) { + dev_err(&pdev->dev, "%s: Failed to register handler: %pe\n", + __func__, ERR_PTR(ret)); + return ret; + } + + platform_set_drvdata(pdev, data); + + ret = nct6694_get_irq_trig(data); + if (ret) + return ret; + + /* Register gpio chip to GPIO framework */ + girq = &data->gpio.irq; + gpio_irq_chip_set_chip(girq, &nct6694_irq_chip); + girq->parent_handler = NULL; + girq->num_parents = 0; + girq->parents = NULL; + girq->default_type = IRQ_TYPE_NONE; + girq->handler = handle_level_irq; + girq->threaded = true; + + ret = gpiochip_add_data(&data->gpio, data); + if (ret) { + dev_err(&pdev->dev, "%s: Failed to register GPIO chip: %pe", + __func__, ERR_PTR(ret)); + return ret; + } + + return 0; +} + +static void nct6694_gpio_remove(struct platform_device *pdev) +{ + struct nct6694_gpio_data *data = platform_get_drvdata(pdev); + + gpiochip_remove(&data->gpio); + cancel_work(&data->irq_work); + cancel_work(&data->irq_trig_work); +} + +static struct platform_driver nct6694_gpio_driver = { + .driver = { + .name = DRVNAME, + }, + .probe = nct6694_gpio_probe, + .remove = nct6694_gpio_remove, +}; + +static int __init nct6694_init(void) +{ + int err; + + err = platform_driver_register(&nct6694_gpio_driver); + if (!err) { + if (err) + platform_driver_unregister(&nct6694_gpio_driver); + } + + return err; +} +subsys_initcall(nct6694_init); + +static void __exit nct6694_exit(void) +{ + platform_driver_unregister(&nct6694_gpio_driver); +} +module_exit(nct6694_exit); + +MODULE_DESCRIPTION("USB-GPIO controller driver for NCT6694"); +MODULE_AUTHOR("Ming Yu "); +MODULE_LICENSE("GPL");