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[60.250.196.139]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2f9e1d5f8d6sm4967367a91.7.2025.02.06.23.45.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 06 Feb 2025 23:45:30 -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 3/7] i2c: Add Nuvoton NCT6694 I2C support Date: Fri, 7 Feb 2025 15:44:58 +0800 Message-Id: <20250207074502.1055111-4-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 This driver supports I2C adapter functionality for NCT6694 MFD device based on USB interface, each I2C controller use default baudrate(100K). Signed-off-by: Ming Yu --- MAINTAINERS | 1 + drivers/i2c/busses/Kconfig | 10 ++ drivers/i2c/busses/Makefile | 1 + drivers/i2c/busses/i2c-nct6694.c | 152 +++++++++++++++++++++++++++++++ 4 files changed, 164 insertions(+) create mode 100644 drivers/i2c/busses/i2c-nct6694.c diff --git a/MAINTAINERS b/MAINTAINERS index be7cd44a4c88..1327e7a6e507 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -16923,6 +16923,7 @@ M: Ming Yu L: linux-kernel@vger.kernel.org S: Supported F: drivers/gpio/gpio-nct6694.c +F: drivers/i2c/busses/i2c-nct6694.c F: drivers/mfd/nct6694.c F: include/linux/mfd/nct6694.h diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig index fc438f445771..d0753d0adaae 100644 --- a/drivers/i2c/busses/Kconfig +++ b/drivers/i2c/busses/Kconfig @@ -1329,6 +1329,16 @@ config I2C_LJCA This driver can also be built as a module. If so, the module will be called i2c-ljca. +config I2C_NCT6694 + tristate "Nuvoton NCT6694 I2C adapter support" + depends on MFD_NCT6694 + help + If you say yes to this option, support will be included for Nuvoton + NCT6694, a USB to I2C interface. + + This driver can also be built as a module. If so, the module will + be called i2c-nct6694. + config I2C_CP2615 tristate "Silicon Labs CP2615 USB sound card and I2C adapter" depends on USB diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile index 1c2a4510abe4..c5a60116dd54 100644 --- a/drivers/i2c/busses/Makefile +++ b/drivers/i2c/busses/Makefile @@ -133,6 +133,7 @@ obj-$(CONFIG_I2C_GXP) += i2c-gxp.o obj-$(CONFIG_I2C_DIOLAN_U2C) += i2c-diolan-u2c.o obj-$(CONFIG_I2C_DLN2) += i2c-dln2.o obj-$(CONFIG_I2C_LJCA) += i2c-ljca.o +obj-$(CONFIG_I2C_NCT6694) += i2c-nct6694.o obj-$(CONFIG_I2C_CP2615) += i2c-cp2615.o obj-$(CONFIG_I2C_PARPORT) += i2c-parport.o obj-$(CONFIG_I2C_PCI1XXXX) += i2c-mchp-pci1xxxx.o diff --git a/drivers/i2c/busses/i2c-nct6694.c b/drivers/i2c/busses/i2c-nct6694.c new file mode 100644 index 000000000000..eb5b44182b5b --- /dev/null +++ b/drivers/i2c/busses/i2c-nct6694.c @@ -0,0 +1,152 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Nuvoton NCT6694 I2C adapter driver based on USB interface. + * + * Copyright (C) 2024 Nuvoton Technology Corp. + */ + +#include +#include +#include +#include +#include +#include + +/* + * USB command module type for NCT6694 I2C controller. + * This defines the module type used for communication with the NCT6694 + * I2C controller over the USB interface. + */ +#define NCT6694_I2C_MOD 0x03 + +/* Command 00h - I2C Deliver */ +#define NCT6694_I2C_DELIVER 0x00 +#define NCT6694_I2C_DELIVER_SEL 0x00 + +enum i2c_baudrate { + I2C_BR_25K = 0, + I2C_BR_50K, + I2C_BR_100K, + I2C_BR_200K, + I2C_BR_400K, + I2C_BR_800K, + I2C_BR_1M +}; + +struct __packed nct6694_i2c_deliver { + u8 port; + u8 br; + u8 addr; + u8 w_cnt; + u8 r_cnt; + u8 rsv[11]; + u8 write_data[0x40]; + u8 read_data[0x40]; +}; + +struct nct6694_i2c_data { + struct nct6694 *nct6694; + struct i2c_adapter adapter; + struct nct6694_i2c_deliver deliver; + unsigned char port; + unsigned char br; +}; + +static int nct6694_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) +{ + struct nct6694_i2c_data *data = adap->algo_data; + struct nct6694_i2c_deliver *deliver = &data->deliver; + static const struct nct6694_cmd_header cmd_hd = { + .mod = NCT6694_I2C_MOD, + .cmd = NCT6694_I2C_DELIVER, + .sel = NCT6694_I2C_DELIVER_SEL, + .len = cpu_to_le16(sizeof(*deliver)) + }; + int ret, i; + + for (i = 0; i < num ; i++) { + struct i2c_msg *msg_temp = &msgs[i]; + + memset(deliver, 0, sizeof(*deliver)); + + if (msg_temp->len > 64) + return -EPROTO; + + deliver->port = data->port; + deliver->br = data->br; + deliver->addr = i2c_8bit_addr_from_msg(msg_temp); + if (msg_temp->flags & I2C_M_RD) { + deliver->r_cnt = msg_temp->len; + ret = nct6694_write_msg(data->nct6694, &cmd_hd, deliver); + if (ret < 0) + return ret; + + memcpy(msg_temp->buf, deliver->read_data, msg_temp->len); + } else { + deliver->w_cnt = msg_temp->len; + memcpy(deliver->write_data, msg_temp->buf, msg_temp->len); + ret = nct6694_write_msg(data->nct6694, &cmd_hd, deliver); + if (ret < 0) + return ret; + } + } + + return num; +} + +static u32 nct6694_func(struct i2c_adapter *adapter) +{ + return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; +} + +static const struct i2c_algorithm algorithm = { + .master_xfer = nct6694_xfer, + .functionality = nct6694_func, +}; + +static int nct6694_i2c_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_i2c_data *data; + + data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->nct6694 = nct6694; + data->port = cell->id; + data->br = I2C_BR_100K; + + sprintf(data->adapter.name, "NCT6694 I2C Adapter %d", cell->id); + data->adapter.owner = THIS_MODULE; + data->adapter.algo = &algorithm; + data->adapter.dev.parent = &pdev->dev; + data->adapter.algo_data = data; + + platform_set_drvdata(pdev, data); + + return i2c_add_adapter(&data->adapter); +} + +static void nct6694_i2c_remove(struct platform_device *pdev) +{ + struct nct6694_i2c_data *data = platform_get_drvdata(pdev); + + i2c_del_adapter(&data->adapter); +} + +static struct platform_driver nct6694_i2c_driver = { + .driver = { + .name = "i2c-nct6694", + }, + .probe = nct6694_i2c_probe, + .remove = nct6694_i2c_remove, +}; + +module_platform_driver(nct6694_i2c_driver); + +MODULE_DESCRIPTION("USB-I2C adapter driver for NCT6694"); +MODULE_AUTHOR("Ming Yu "); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:nct6694-i2c");