Re: [PATCH v2 2/7] gpio: Add Nuvoton NCT6694 GPIO support
From: Bartosz Golaszewski <hidden>
Date: 2024-11-21 08:28:28
Also in:
linux-can, linux-gpio, linux-hwmon, linux-i2c, linux-rtc, linux-watchdog, lkml
On Thu, Nov 21, 2024 at 7:41 AM Ming Yu [off-list ref] wrote:
quoted hunk ↗ jump to hunk
This driver supports GPIO and IRQ functionality for NCT6694 MFD device based on USB interface. Signed-off-by: Ming Yu <tmyu0@nuvoton.com> --- MAINTAINERS | 1 + drivers/gpio/Kconfig | 12 + drivers/gpio/Makefile | 1 + drivers/gpio/gpio-nct6694.c | 441 ++++++++++++++++++++++++++++++++++++ 4 files changed, 455 insertions(+) create mode 100644 drivers/gpio/gpio-nct6694.cdiff --git a/MAINTAINERS b/MAINTAINERS index 9c9a94ff8f98..6688c5c470b7 100644 --- a/MAINTAINERS +++ b/MAINTAINERS@@ -16545,6 +16545,7 @@ NUVOTON NCT6694 MFD DRIVER M: Ming Yu <tmyu0@nuvoton.com> L: linux-kernel@vger.kernel.org S: Supported +F: drivers/gpio/gpio-nct6694.c F: drivers/mfd/nct6694.c F: include/linux/mfd/nct6694.hdiff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 56fee58e281e..7773b5326e60 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig@@ -1460,6 +1460,18 @@ 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_PALMASdiff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index af3ba4d81b58..ad80a078b27b 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile@@ -123,6 +123,7 @@ 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.odiff --git a/drivers/gpio/gpio-nct6694.c b/drivers/gpio/gpio-nct6694.c new file mode 100644 index 000000000000..1776200b3a04 --- /dev/null +++ b/drivers/gpio/gpio-nct6694.c@@ -0,0 +1,441 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Nuvoton NCT6694 GPIO controller driver based on USB interface. + * + * Copyright (C) 2024 Nuvoton Technology Corp. + */ + +#include <linux/gpio/driver.h> +#include <linux/interrupt.h> +#include <linux/mfd/core.h> +#include <linux/mfd/nct6694.h> +#include <linux/module.h> +#include <linux/platform_device.h> + +/* Host interface */ +#define NCT6694_GPIO_MOD 0xFF +#define NCT6694_GPIO_LEN 0x01 + +/* Report Channel */ +#define NCT6694_GPIO_VER 0x90 +#define NCT6694_GPIO_VALID 0x110 +#define NCT6694_GPI_DATA 0x120 +#define NCT6694_GPO_DIR 0x170 +#define NCT6694_GPO_TYPE 0x180 +#define NCT6694_GPO_DATA 0x190 + +#define NCT6694_GPI_STS 0x130 +#define NCT6694_GPI_CLR 0x140 +#define NCT6694_GPI_FALLING 0x150 +#define NCT6694_GPI_RISING 0x160 + +#define NCT6694_NR_GPIO 8 + +struct nct6694_gpio_data { + struct nct6694 *nct6694; + struct gpio_chip gpio; + struct mutex lock; + /* Protect irq operation */ + struct mutex irq_lock; + + unsigned char xmit_buf; + unsigned char irq_trig_falling; + unsigned char irq_trig_rising; + + /* Current gpio group */ + unsigned char group; + + /* GPIO line names */ + char **names;
You only use this in probe() and after assigning it to gc->names, you never reference it again. You don't need this field here, it can be a local variable in probe().
+};
+
+static int nct6694_get_direction(struct gpio_chip *gpio, unsigned int offset)
+{
+ struct nct6694_gpio_data *data = gpiochip_get_data(gpio);
+ int ret;
+
+ guard(mutex)(&data->lock);
+
+ ret = nct6694_read_msg(data->nct6694, NCT6694_GPIO_MOD,
+ NCT6694_GPO_DIR + data->group,
+ NCT6694_GPIO_LEN, &data->xmit_buf);
+ if (ret < 0)
+ return ret;
+
+ return !(BIT(offset) & data->xmit_buf);
+}
+
+static int nct6694_direction_input(struct gpio_chip *gpio, unsigned int offset)
+{
+ struct nct6694_gpio_data *data = gpiochip_get_data(gpio);
+ int ret;
+
+ guard(mutex)(&data->lock);
+
+ ret = nct6694_read_msg(data->nct6694, NCT6694_GPIO_MOD,
+ NCT6694_GPO_DIR + data->group,
+ NCT6694_GPIO_LEN, &data->xmit_buf);
+ if (ret < 0)
+ return ret;
+
+ data->xmit_buf &= ~(1 << offset);
+
+ return nct6694_write_msg(data->nct6694, NCT6694_GPIO_MOD,
+ NCT6694_GPO_DIR + data->group,
+ NCT6694_GPIO_LEN, &data->xmit_buf);
+}
+
+static int nct6694_direction_output(struct gpio_chip *gpio,
+ unsigned int offset, int val)
+{
+ struct nct6694_gpio_data *data = gpiochip_get_data(gpio);
+ int ret;
+
+ guard(mutex)(&data->lock);
+
+ /* Set direction to output */
+ ret = nct6694_read_msg(data->nct6694, NCT6694_GPIO_MOD,
+ NCT6694_GPO_DIR + data->group,
+ NCT6694_GPIO_LEN, &data->xmit_buf);
+ if (ret < 0)
+ return ret;
+
+ data->xmit_buf |= (1 << offset);
+ ret = nct6694_write_msg(data->nct6694, NCT6694_GPIO_MOD,
+ NCT6694_GPO_DIR + data->group,
+ NCT6694_GPIO_LEN, &data->xmit_buf);
+ if (ret < 0)
+ return ret;
+
+ /* Then set output level */
+ ret = nct6694_read_msg(data->nct6694, NCT6694_GPIO_MOD,
+ NCT6694_GPO_DATA + data->group,
+ NCT6694_GPIO_LEN, &data->xmit_buf);
+ if (ret < 0)
+ return ret;
+
+ if (val)
+ data->xmit_buf |= (1 << offset);
+ else
+ data->xmit_buf &= ~(1 << offset);
+
+ return nct6694_write_msg(data->nct6694, NCT6694_GPIO_MOD,
+ NCT6694_GPO_DATA + data->group,
+ NCT6694_GPIO_LEN, &data->xmit_buf);
+}
+
+static int nct6694_get_value(struct gpio_chip *gpio, unsigned int offset)
+{
+ struct nct6694_gpio_data *data = gpiochip_get_data(gpio);
+ int ret;
+
+ guard(mutex)(&data->lock);
+
+ ret = nct6694_read_msg(data->nct6694, NCT6694_GPIO_MOD,
+ NCT6694_GPO_DIR + data->group,
+ NCT6694_GPIO_LEN, &data->xmit_buf);
+ if (ret < 0)
+ return ret;
+
+ if (BIT(offset) & data->xmit_buf) {
+ ret = nct6694_read_msg(data->nct6694, NCT6694_GPIO_MOD,
+ NCT6694_GPO_DATA + data->group,
+ NCT6694_GPIO_LEN, &data->xmit_buf);
+ if (ret < 0)
+ return ret;
+
+ return !!(BIT(offset) & data->xmit_buf);
+ }
+
+ ret = nct6694_read_msg(data->nct6694, NCT6694_GPIO_MOD,
+ NCT6694_GPI_DATA + data->group,
+ NCT6694_GPIO_LEN, &data->xmit_buf);
+ if (ret < 0)
+ return ret;
+
+ return !!(BIT(offset) & data->xmit_buf);
+}
+
+static void nct6694_set_value(struct gpio_chip *gpio, unsigned int offset,
+ int val)
+{
+ struct nct6694_gpio_data *data = gpiochip_get_data(gpio);
+
+ guard(mutex)(&data->lock);
+
+ nct6694_read_msg(data->nct6694, NCT6694_GPIO_MOD,
+ NCT6694_GPO_DATA + data->group,
+ NCT6694_GPIO_LEN, &data->xmit_buf);
+
+ if (val)
+ data->xmit_buf |= (1 << offset);
+ else
+ data->xmit_buf &= ~(1 << offset);
+
+ nct6694_write_msg(data->nct6694, NCT6694_GPIO_MOD,
+ NCT6694_GPO_DATA + data->group,
+ NCT6694_GPIO_LEN, &data->xmit_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);
+ int ret;
+
+ guard(mutex)(&data->lock);
+
+ ret = nct6694_read_msg(data->nct6694, NCT6694_GPIO_MOD,
+ NCT6694_GPO_TYPE + data->group,
+ NCT6694_GPIO_LEN, &data->xmit_buf);
+ if (ret < 0)
+ return ret;
+
+ switch (pinconf_to_config_param(config)) {
+ case PIN_CONFIG_DRIVE_OPEN_DRAIN:
+ data->xmit_buf |= (1 << offset);
+ break;
+ case PIN_CONFIG_DRIVE_PUSH_PULL:
+ data->xmit_buf &= ~(1 << offset);
+ break;
+ default:
+ return -ENOTSUPP;
+ }
+
+ return nct6694_write_msg(data->nct6694, NCT6694_GPIO_MOD,
+ NCT6694_GPO_TYPE + data->group,
+ NCT6694_GPIO_LEN, &data->xmit_buf);
+}
+
+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);
+ int ret;
+
+ guard(mutex)(&data->lock);
+
+ ret = nct6694_read_msg(data->nct6694, NCT6694_GPIO_MOD,
+ NCT6694_GPIO_VALID + data->group,
+ NCT6694_GPIO_LEN, &data->xmit_buf);
+ if (ret < 0)
+ return ret;
+
+ *valid_mask = data->xmit_buf;
+
+ return ret;
+}
+
+static irqreturn_t nct6694_irq_handler(int irq, void *priv)
+{
+ struct nct6694_gpio_data *data = priv;
+ unsigned char status;
+
+ guard(mutex)(&data->lock);
+
+ nct6694_read_msg(data->nct6694, NCT6694_GPIO_MOD,
+ NCT6694_GPI_STS + data->group,
+ NCT6694_GPIO_LEN, &data->xmit_buf);
+
+ status = data->xmit_buf;
+
+ while (status) {
+ int bit = __ffs(status);
+
+ data->xmit_buf = BIT(bit);
+ handle_nested_irq(irq_find_mapping(data->gpio.irq.domain, bit));
+ status &= ~(1 << bit);
+ nct6694_write_msg(data->nct6694, NCT6694_GPIO_MOD,
+ NCT6694_GPI_CLR + data->group,
+ NCT6694_GPIO_LEN, &data->xmit_buf);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int nct6694_get_irq_trig(struct nct6694_gpio_data *data)
+{
+ int ret;
+
+ guard(mutex)(&data->lock);
+
+ ret = nct6694_read_msg(data->nct6694, NCT6694_GPIO_MOD,
+ NCT6694_GPI_FALLING + data->group,
+ NCT6694_GPIO_LEN, &data->irq_trig_falling);
+ if (ret)
+ return ret;
+
+ return nct6694_read_msg(data->nct6694, NCT6694_GPIO_MOD,
+ NCT6694_GPI_RISING + data->group,
+ NCT6694_GPIO_LEN, &data->irq_trig_rising);
+}
+
+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 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);
+ irq_hw_number_t hwirq = irqd_to_hwirq(d);
+
+ guard(mutex)(&data->lock);
+
+ 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 -ENOTSUPP;
+ }
+
+ 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);
+
+ scoped_guard(mutex, &data->lock) {
+ nct6694_write_msg(data->nct6694, NCT6694_GPIO_MOD,
+ NCT6694_GPI_FALLING + data->group,
+ NCT6694_GPIO_LEN, &data->irq_trig_falling);
+
+ nct6694_write_msg(data->nct6694, NCT6694_GPIO_MOD,
+ NCT6694_GPI_RISING + data->group,
+ NCT6694_GPIO_LEN, &data->irq_trig_rising);
+ }
+
+ mutex_unlock(&data->irq_lock);
+}
+
+static const struct irq_chip nct6694_irq_chip = {
+ .name = "nct6694-gpio",
+ .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 int nct6694_gpio_probe(struct platform_device *pdev)
+{
+ const struct mfd_cell *cell = mfd_get_cell(pdev);
+ struct device *dev = &pdev->dev;
+ struct nct6694 *nct6694 = dev_get_drvdata(pdev->dev.parent);
+ struct nct6694_gpio_data *data;
+ struct gpio_irq_chip *girq;
+ int ret, irq, i;
+
+ irq = irq_create_mapping(nct6694->domain,
+ NCT6694_IRQ_GPIO0 + cell->id);
+ if (!irq)
+ return -EINVAL;
+
+ data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->names = devm_kzalloc(dev, sizeof(char *) * NCT6694_NR_GPIO,devm_kcalloc()?
+ GFP_KERNEL);
+ if (!data->names)
+ return -ENOMEM;
+
+ for (i = 0; i < NCT6694_NR_GPIO; i++) {
+ data->names[i] = devm_kasprintf(dev, GFP_KERNEL, "GPIO%X%d",
+ cell->id, i);
+ if (!data->names[i])
+ return -ENOMEM;
+ }
+
+ data->nct6694 = nct6694;
+ data->group = cell->id;
+
+ data->gpio.names = (const char * const*)data->names;
+ data->gpio.label = pdev->name;
+ 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 = NCT6694_NR_GPIO;
+
+ mutex_init(&data->irq_lock);
+
+ platform_set_drvdata(pdev, data);There is no corresponding platform_get_drvdata() so you don't need this.
+
+ ret = nct6694_get_irq_trig(data);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to get irq trigger type\n");
+
+ /* 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 = devm_request_threaded_irq(dev, irq, NULL, nct6694_irq_handler,
+ IRQF_ONESHOT | IRQF_SHARED,
+ "nct6694-gpio", data);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to request irq\n");
+
+ return devm_gpiochip_add_data(dev, &data->gpio, data);
+}
+
+static struct platform_driver nct6694_gpio_driver = {
+ .driver = {
+ .name = "nct6694-gpio",
+ },
+ .probe = nct6694_gpio_probe,
+};
+
+module_platform_driver(nct6694_gpio_driver);
+
+MODULE_DESCRIPTION("USB-GPIO controller driver for NCT6694");
+MODULE_AUTHOR("Ming Yu [off-list ref]");
+MODULE_LICENSE("GPL");It's an MFD device, don't you need a MODULE_ALIAS() for this module to load? Bart
-- 2.34.1