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[60.250.196.139]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2f9e1d5f8d6sm4967367a91.7.2025.02.06.23.45.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 06 Feb 2025 23:45:20 -0800 (PST) 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, 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-rtc@vger.kernel.org, linux-usb@vger.kernel.org, Ming Yu Subject: [PATCH v7 1/7] mfd: Add core driver for Nuvoton NCT6694 Date: Fri, 7 Feb 2025 15:44:56 +0800 Message-Id: <20250207074502.1055111-2-a0282524688@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250207074502.1055111-1-a0282524688@gmail.com> References: <20250207074502.1055111-1-a0282524688@gmail.com> Precedence: bulk X-Mailing-List: linux-watchdog@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The Nuvoton NCT6694 is a peripheral expander with 16 GPIO chips, 6 I2C controllers, 2 CANfd controllers, 2 Watchdog timers, ADC, PWM, and RTC. This driver implements USB device functionality and shares the chip's peripherals as a child device. Each child device can use the USB functions nct6694_read_msg() and nct6694_write_msg() to issue a command. They can also request interrupt that will be called when the USB device receives its interrupt pipe. Signed-off-by: Ming Yu --- MAINTAINERS | 7 + drivers/mfd/Kconfig | 18 ++ drivers/mfd/Makefile | 2 + drivers/mfd/nct6694.c | 373 ++++++++++++++++++++++++++++++++++++ include/linux/mfd/nct6694.h | 102 ++++++++++ 5 files changed, 502 insertions(+) create mode 100644 drivers/mfd/nct6694.c create mode 100644 include/linux/mfd/nct6694.h diff --git a/MAINTAINERS b/MAINTAINERS index 873aa2cce4d7..c700a0b96960 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -16918,6 +16918,13 @@ F: drivers/nubus/ F: include/linux/nubus.h F: include/uapi/linux/nubus.h +NUVOTON NCT6694 MFD DRIVER +M: Ming Yu +L: linux-kernel@vger.kernel.org +S: Supported +F: drivers/mfd/nct6694.c +F: include/linux/mfd/nct6694.h + NVIDIA (rivafb and nvidiafb) FRAMEBUFFER DRIVER M: Antonino Daplas L: linux-fbdev@vger.kernel.org diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index 6b0682af6e32..c97a2bdcea0b 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -1045,6 +1045,24 @@ config MFD_MENF21BMC This driver can also be built as a module. If so the module will be called menf21bmc. +config MFD_NCT6694 + tristate "Nuvoton NCT6694 support" + select MFD_CORE + depends on USB + help + This enables support for the Nuvoton USB device NCT6694, which shares + peripherals. + + This driver provides core APIs to access the NCT6694 hardware + monitoring and control features. + + The NCT6694 is a versatile multi-function device that supports + functionalities such as GPIO, I2C, CAN, WDT, HWMON, and RTC + management. + + Additional drivers must be enabled to utilize the specific + functionalities of the device. + config MFD_OCELOT tristate "Microsemi Ocelot External Control Support" depends on SPI_MASTER diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index 9220eaf7cf12..7725b732e265 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -121,6 +121,8 @@ obj-$(CONFIG_MFD_MC13XXX) += mc13xxx-core.o obj-$(CONFIG_MFD_MC13XXX_SPI) += mc13xxx-spi.o obj-$(CONFIG_MFD_MC13XXX_I2C) += mc13xxx-i2c.o +obj-$(CONFIG_MFD_NCT6694) += nct6694.o + obj-$(CONFIG_MFD_CORE) += mfd-core.o ocelot-soc-objs := ocelot-core.o ocelot-spi.o diff --git a/drivers/mfd/nct6694.c b/drivers/mfd/nct6694.c new file mode 100644 index 000000000000..ab857d5b06a5 --- /dev/null +++ b/drivers/mfd/nct6694.c @@ -0,0 +1,373 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Nuvoton NCT6694 core driver using USB interface to provide + * access to the NCT6694 hardware monitoring and control features. + * + * The NCT6694 is a versatile multi-function device that supports + * functionalities such as GPIO, I2C, CAN, WDT, HWMON and RTC + * management. + * + * Copyright (C) 2024 Nuvoton Technology Corp. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static const struct mfd_cell nct6694_dev[] = { + MFD_CELL_BASIC("gpio-nct6694", NULL, NULL, 0, 0x0), + MFD_CELL_BASIC("gpio-nct6694", NULL, NULL, 0, 0x1), + MFD_CELL_BASIC("gpio-nct6694", NULL, NULL, 0, 0x2), + MFD_CELL_BASIC("gpio-nct6694", NULL, NULL, 0, 0x3), + MFD_CELL_BASIC("gpio-nct6694", NULL, NULL, 0, 0x4), + MFD_CELL_BASIC("gpio-nct6694", NULL, NULL, 0, 0x5), + MFD_CELL_BASIC("gpio-nct6694", NULL, NULL, 0, 0x6), + MFD_CELL_BASIC("gpio-nct6694", NULL, NULL, 0, 0x7), + MFD_CELL_BASIC("gpio-nct6694", NULL, NULL, 0, 0x8), + MFD_CELL_BASIC("gpio-nct6694", NULL, NULL, 0, 0x9), + MFD_CELL_BASIC("gpio-nct6694", NULL, NULL, 0, 0xA), + MFD_CELL_BASIC("gpio-nct6694", NULL, NULL, 0, 0xB), + MFD_CELL_BASIC("gpio-nct6694", NULL, NULL, 0, 0xC), + MFD_CELL_BASIC("gpio-nct6694", NULL, NULL, 0, 0xD), + MFD_CELL_BASIC("gpio-nct6694", NULL, NULL, 0, 0xE), + MFD_CELL_BASIC("gpio-nct6694", NULL, NULL, 0, 0xF), + + MFD_CELL_BASIC("i2c-nct6694", NULL, NULL, 0, 0x0), + MFD_CELL_BASIC("i2c-nct6694", NULL, NULL, 0, 0x1), + MFD_CELL_BASIC("i2c-nct6694", NULL, NULL, 0, 0x2), + MFD_CELL_BASIC("i2c-nct6694", NULL, NULL, 0, 0x3), + MFD_CELL_BASIC("i2c-nct6694", NULL, NULL, 0, 0x4), + MFD_CELL_BASIC("i2c-nct6694", NULL, NULL, 0, 0x5), + + MFD_CELL_BASIC("nct6694_canfd", NULL, NULL, 0, 0x0), + MFD_CELL_BASIC("nct6694_canfd", NULL, NULL, 0, 0x1), + + MFD_CELL_BASIC("nct6694_wdt", NULL, NULL, 0, 0x0), + MFD_CELL_BASIC("nct6694_wdt", NULL, NULL, 0, 0x1), + + MFD_CELL_NAME("nct6694-hwmon"), + MFD_CELL_NAME("rtc-nct6694"), +}; + +static int nct6694_response_err_handling(struct nct6694 *nct6694, + unsigned char err_status) +{ + switch (err_status) { + case NCT6694_NO_ERROR: + return err_status; + case NCT6694_NOT_SUPPORT_ERROR: + dev_warn(nct6694->dev, "Command is not supported!\n"); + break; + case NCT6694_NO_RESPONSE_ERROR: + dev_warn(nct6694->dev, "Command received no response!\n"); + break; + case NCT6694_TIMEOUT_ERROR: + dev_warn(nct6694->dev, "Command timed out!\n"); + break; + case NCT6694_PENDING: + dev_warn(nct6694->dev, "Command is pending!\n"); + break; + default: + return -EINVAL; + } + + return -EIO; +} + +int nct6694_read_msg(struct nct6694 *nct6694, const struct nct6694_cmd_header *cmd_hd, void *buf) +{ + union nct6694_usb_msg *msg = nct6694->usb_msg; + int tx_len, rx_len, ret; + + guard(mutex)(&nct6694->access_lock); + + /* Send command packet to USB device */ + memcpy(&msg->cmd_header, cmd_hd, sizeof(*cmd_hd)); + msg->cmd_header.hctrl = NCT6694_HCTRL_GET; + + ret = usb_bulk_msg(nct6694->udev, + usb_sndbulkpipe(nct6694->udev, NCT6694_BULK_OUT_EP), + &msg->cmd_header, sizeof(*msg), &tx_len, + nct6694->timeout); + if (ret) + return ret; + + /* Receive response packet from USB device */ + ret = usb_bulk_msg(nct6694->udev, + usb_rcvbulkpipe(nct6694->udev, NCT6694_BULK_IN_EP), + &msg->response_header, sizeof(*msg), &rx_len, + nct6694->timeout); + if (ret) + return ret; + + /* Receive data packet from USB device */ + ret = usb_bulk_msg(nct6694->udev, + usb_rcvbulkpipe(nct6694->udev, NCT6694_BULK_IN_EP), + buf, le16_to_cpu(cmd_hd->len), &rx_len, + nct6694->timeout); + if (ret) + return ret; + + if (rx_len != le16_to_cpu(cmd_hd->len)) { + dev_err(nct6694->dev, "Expected received length %d, but got %d\n", + le16_to_cpu(cmd_hd->len), rx_len); + return -EIO; + } + + return nct6694_response_err_handling(nct6694, msg->response_header.sts); +} +EXPORT_SYMBOL(nct6694_read_msg); + +int nct6694_write_msg(struct nct6694 *nct6694, const struct nct6694_cmd_header *cmd_hd, void *buf) +{ + union nct6694_usb_msg *msg = nct6694->usb_msg; + int tx_len, rx_len, ret; + + guard(mutex)(&nct6694->access_lock); + + /* Send command packet to USB device */ + memcpy(&msg->cmd_header, cmd_hd, sizeof(*cmd_hd)); + msg->cmd_header.hctrl = NCT6694_HCTRL_SET; + + ret = usb_bulk_msg(nct6694->udev, + usb_sndbulkpipe(nct6694->udev, NCT6694_BULK_OUT_EP), + &msg->cmd_header, sizeof(*msg), &tx_len, + nct6694->timeout); + if (ret) + return ret; + + /* Send data packet to USB device */ + ret = usb_bulk_msg(nct6694->udev, + usb_sndbulkpipe(nct6694->udev, NCT6694_BULK_OUT_EP), + buf, le16_to_cpu(cmd_hd->len), &tx_len, + nct6694->timeout); + if (ret) + return ret; + + /* Receive response packet from USB device */ + ret = usb_bulk_msg(nct6694->udev, + usb_rcvbulkpipe(nct6694->udev, NCT6694_BULK_IN_EP), + &msg->response_header, sizeof(*msg), &rx_len, + nct6694->timeout); + if (ret) + return ret; + + /* Receive data packet from USB device */ + ret = usb_bulk_msg(nct6694->udev, + usb_rcvbulkpipe(nct6694->udev, NCT6694_BULK_IN_EP), + buf, le16_to_cpu(cmd_hd->len), &rx_len, + nct6694->timeout); + if (ret) + return ret; + + if (rx_len != le16_to_cpu(cmd_hd->len)) { + dev_err(nct6694->dev, "Expected transmitted length %d, but got %d\n", + le16_to_cpu(cmd_hd->len), rx_len); + return -EIO; + } + + return nct6694_response_err_handling(nct6694, msg->response_header.sts); +} +EXPORT_SYMBOL(nct6694_write_msg); + +static void usb_int_callback(struct urb *urb) +{ + struct nct6694 *nct6694 = urb->context; + unsigned int *int_status = urb->transfer_buffer; + int ret; + + switch (urb->status) { + case 0: + break; + case -ECONNRESET: + case -ENOENT: + case -ESHUTDOWN: + return; + default: + goto resubmit; + } + + while (*int_status) { + int irq = __ffs(*int_status); + + generic_handle_irq_safe(irq_find_mapping(nct6694->domain, irq)); + *int_status &= ~BIT(irq); + } + +resubmit: + ret = usb_submit_urb(urb, GFP_ATOMIC); + if (ret) + dev_dbg(nct6694->dev, "%s: Failed to resubmit urb, status %pe", + __func__, ERR_PTR(ret)); +} + +static void nct6694_irq_lock(struct irq_data *data) +{ + struct nct6694 *nct6694 = irq_data_get_irq_chip_data(data); + + mutex_lock(&nct6694->irq_lock); +} + +static void nct6694_irq_sync_unlock(struct irq_data *data) +{ + struct nct6694 *nct6694 = irq_data_get_irq_chip_data(data); + + mutex_unlock(&nct6694->irq_lock); +} + +static void nct6694_irq_enable(struct irq_data *data) +{ + struct nct6694 *nct6694 = irq_data_get_irq_chip_data(data); + irq_hw_number_t hwirq = irqd_to_hwirq(data); + + nct6694->irq_enable |= BIT(hwirq); +} + +static void nct6694_irq_disable(struct irq_data *data) +{ + struct nct6694 *nct6694 = irq_data_get_irq_chip_data(data); + irq_hw_number_t hwirq = irqd_to_hwirq(data); + + nct6694->irq_enable &= ~BIT(hwirq); +} + +static struct irq_chip nct6694_irq_chip = { + .name = "nct6694-irq", + .flags = IRQCHIP_SKIP_SET_WAKE, + .irq_bus_lock = nct6694_irq_lock, + .irq_bus_sync_unlock = nct6694_irq_sync_unlock, + .irq_enable = nct6694_irq_enable, + .irq_disable = nct6694_irq_disable, +}; + +static int nct6694_irq_domain_map(struct irq_domain *d, unsigned int irq, + irq_hw_number_t hw) +{ + struct nct6694 *nct6694 = d->host_data; + + irq_set_chip_data(irq, nct6694); + irq_set_chip_and_handler(irq, &nct6694_irq_chip, handle_simple_irq); + + return 0; +} + +static void nct6694_irq_domain_unmap(struct irq_domain *d, unsigned int irq) +{ + irq_set_chip_and_handler(irq, NULL, NULL); + irq_set_chip_data(irq, NULL); +} + +static const struct irq_domain_ops nct6694_irq_domain_ops = { + .map = nct6694_irq_domain_map, + .unmap = nct6694_irq_domain_unmap, +}; + +static int nct6694_usb_probe(struct usb_interface *iface, + const struct usb_device_id *id) +{ + struct usb_device *udev = interface_to_usbdev(iface); + struct usb_endpoint_descriptor *int_endpoint; + struct usb_host_interface *interface; + struct device *dev = &iface->dev; + struct nct6694 *nct6694; + int pipe, maxp; + int ret; + + nct6694 = devm_kzalloc(dev, sizeof(*nct6694), GFP_KERNEL); + if (!nct6694) + return -ENOMEM; + + pipe = usb_rcvintpipe(udev, NCT6694_INT_IN_EP); + maxp = usb_maxpacket(udev, pipe); + + nct6694->usb_msg = devm_kzalloc(dev, sizeof(union nct6694_usb_msg), GFP_KERNEL); + if (!nct6694->usb_msg) + return -ENOMEM; + + nct6694->int_buffer = devm_kzalloc(dev, maxp, GFP_KERNEL); + if (!nct6694->int_buffer) + return -ENOMEM; + + nct6694->int_in_urb = usb_alloc_urb(0, GFP_KERNEL); + if (!nct6694->int_in_urb) + return -ENOMEM; + + nct6694->domain = irq_domain_add_simple(NULL, NCT6694_NR_IRQS, 0, + &nct6694_irq_domain_ops, + nct6694); + if (!nct6694->domain) { + ret = -ENODEV; + goto err_urb; + } + + nct6694->dev = dev; + nct6694->udev = udev; + nct6694->timeout = NCT6694_URB_TIMEOUT; /* Wait until URB completes */ + + devm_mutex_init(dev, &nct6694->access_lock); + devm_mutex_init(dev, &nct6694->irq_lock); + + interface = iface->cur_altsetting; + int_endpoint = &interface->endpoint[0].desc; + if (!usb_endpoint_is_int_in(int_endpoint)) { + ret = -ENODEV; + goto err_urb; + } + usb_fill_int_urb(nct6694->int_in_urb, udev, pipe, + nct6694->int_buffer, maxp, usb_int_callback, + nct6694, int_endpoint->bInterval); + ret = usb_submit_urb(nct6694->int_in_urb, GFP_KERNEL); + if (ret) + goto err_urb; + + usb_set_intfdata(iface, nct6694); + + ret = mfd_add_hotplug_devices(dev, nct6694_dev, ARRAY_SIZE(nct6694_dev)); + if (ret) + goto err_mfd; + + return 0; + +err_mfd: + usb_kill_urb(nct6694->int_in_urb); +err_urb: + usb_free_urb(nct6694->int_in_urb); + return ret; +} + +static void nct6694_usb_disconnect(struct usb_interface *iface) +{ + struct nct6694 *nct6694 = usb_get_intfdata(iface); + + mfd_remove_devices(nct6694->dev); + usb_kill_urb(nct6694->int_in_urb); + usb_free_urb(nct6694->int_in_urb); +} + +static const struct usb_device_id nct6694_ids[] = { + { USB_DEVICE_AND_INTERFACE_INFO(NCT6694_VENDOR_ID, + NCT6694_PRODUCT_ID, + 0xFF, 0x00, 0x00)}, + {} +}; +MODULE_DEVICE_TABLE(usb, nct6694_ids); + +static struct usb_driver nct6694_usb_driver = { + .name = "nct6694", + .id_table = nct6694_ids, + .probe = nct6694_usb_probe, + .disconnect = nct6694_usb_disconnect, +}; + +module_usb_driver(nct6694_usb_driver); + +MODULE_DESCRIPTION("USB core driver for NCT6694"); +MODULE_AUTHOR("Ming Yu "); +MODULE_LICENSE("GPL"); diff --git a/include/linux/mfd/nct6694.h b/include/linux/mfd/nct6694.h new file mode 100644 index 000000000000..c75a69f04927 --- /dev/null +++ b/include/linux/mfd/nct6694.h @@ -0,0 +1,102 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Nuvoton NCT6694 USB transaction and data structure. + * + * Copyright (C) 2024 Nuvoton Technology Corp. + */ + +#ifndef __MFD_NCT6694_H +#define __MFD_NCT6694_H + +#define NCT6694_VENDOR_ID 0x0416 +#define NCT6694_PRODUCT_ID 0x200B +#define NCT6694_INT_IN_EP 0x81 +#define NCT6694_BULK_IN_EP 0x02 +#define NCT6694_BULK_OUT_EP 0x03 + +#define NCT6694_HCTRL_SET 0x40 +#define NCT6694_HCTRL_GET 0x80 + +#define NCT6694_URB_TIMEOUT 1000 + +enum nct6694_irq_id { + NCT6694_IRQ_GPIO0 = 0, + NCT6694_IRQ_GPIO1, + NCT6694_IRQ_GPIO2, + NCT6694_IRQ_GPIO3, + NCT6694_IRQ_GPIO4, + NCT6694_IRQ_GPIO5, + NCT6694_IRQ_GPIO6, + NCT6694_IRQ_GPIO7, + NCT6694_IRQ_GPIO8, + NCT6694_IRQ_GPIO9, + NCT6694_IRQ_GPIOA, + NCT6694_IRQ_GPIOB, + NCT6694_IRQ_GPIOC, + NCT6694_IRQ_GPIOD, + NCT6694_IRQ_GPIOE, + NCT6694_IRQ_GPIOF, + NCT6694_IRQ_CAN1, + NCT6694_IRQ_CAN2, + NCT6694_IRQ_RTC, + NCT6694_NR_IRQS, +}; + +enum nct6694_response_err_status { + NCT6694_NO_ERROR = 0, + NCT6694_FORMAT_ERROR, + NCT6694_RESERVED1, + NCT6694_RESERVED2, + NCT6694_NOT_SUPPORT_ERROR, + NCT6694_NO_RESPONSE_ERROR, + NCT6694_TIMEOUT_ERROR, + NCT6694_PENDING, +}; + +struct __packed nct6694_cmd_header { + u8 rsv1; + u8 mod; + union __packed { + __le16 offset; + struct __packed { + u8 cmd; + u8 sel; + }; + }; + u8 hctrl; + u8 rsv2; + __le16 len; +}; + +struct __packed nct6694_response_header { + u8 sequence_id; + u8 sts; + u8 reserved[4]; + __le16 len; +}; + +union __packed nct6694_usb_msg { + struct nct6694_cmd_header cmd_header; + struct nct6694_response_header response_header; +}; + +struct nct6694 { + struct device *dev; + struct irq_domain *domain; + /* Mutex to protect access to the device */ + struct mutex access_lock; + /* Mutex to protect access to the IRQ */ + struct mutex irq_lock; + struct urb *int_in_urb; + struct usb_device *udev; + union nct6694_usb_msg *usb_msg; + unsigned char *int_buffer; + unsigned int irq_enable; + /* Time in msec to wait for the URB to the complete */ + long timeout; +}; + +int nct6694_read_msg(struct nct6694 *nct6694, const struct nct6694_cmd_header *cmd_hd, void *buf); +int nct6694_write_msg(struct nct6694 *nct6694, const struct nct6694_cmd_header *cmd_hd, void *buf); + +#endif