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[60.250.192.107]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-20e7f0f6e89sm68503615ad.277.2024.10.24.01.59.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 24 Oct 2024 01:59:58 -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 3/9] i2c: Add Nuvoton NCT6694 I2C support Date: Thu, 24 Oct 2024 16:59:16 +0800 Message-Id: <20241024085922.133071-4-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-iio@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 | 166 +++++++++++++++++++++++++++++++ 4 files changed, 178 insertions(+) create mode 100644 drivers/i2c/busses/i2c-nct6694.c diff --git a/MAINTAINERS b/MAINTAINERS index 2c86d5dab3f1..1cc64f9f154a 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -16439,6 +16439,7 @@ 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 6b3ba7e5723a..01a60de4b8a4 100644 --- a/drivers/i2c/busses/Kconfig +++ b/drivers/i2c/busses/Kconfig @@ -1315,6 +1315,16 @@ 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-nct6604. + 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 ecc07c50f2a0..3c4a0ea5a46f 100644 --- a/drivers/i2c/busses/Makefile +++ b/drivers/i2c/busses/Makefile @@ -135,6 +135,7 @@ 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_CP2615) += i2c-cp2615.o +obj-$(CONFIG_I2C_NCT6694) += i2c-nct6694.o obj-$(CONFIG_I2C_PARPORT) += i2c-parport.o obj-$(CONFIG_I2C_PCI1XXXX) += i2c-mchp-pci1xxxx.o obj-$(CONFIG_I2C_ROBOTFUZZ_OSIF) += i2c-robotfuzz-osif.o diff --git a/drivers/i2c/busses/i2c-nct6694.c b/drivers/i2c/busses/i2c-nct6694.c new file mode 100644 index 000000000000..b33d90f26f9f --- /dev/null +++ b/drivers/i2c/busses/i2c-nct6694.c @@ -0,0 +1,166 @@ +// 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 + +/* Host interface */ +#define REQUEST_I2C_MOD 0x03 + +/* Message Channel*/ +/* Command 00h */ +#define REQUEST_I2C_OFFSET 0x0000 /* OFFSET = SEL|CMD */ +#define REQUEST_I2C_LEN 0x90 +#define I2C_PORT_IDX 0x00 +#define I2C_BR_IDX 0x01 +#define I2C_ADDR_IDX 0x02 +#define I2C_W_CNT_IDX 0x03 +#define I2C_R_CNT_IDX 0x04 + +#define I2C_RD_IDX 0x50 +#define I2C_WR_IDX 0x10 + +#define DRVNAME "nct6694-i2c" + +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 nct6694_i2c_data { + struct nct6694 *nct6694; + struct i2c_adapter adapter; + 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; + int ret, i; + + for (i = 0; i < num ; i++) { + unsigned char buf[REQUEST_I2C_LEN] = {0}; + struct i2c_msg *msg_temp = &msgs[i]; + + if (msg_temp->len > 64) + return -EPROTO; + + buf[I2C_PORT_IDX] = data->port; + buf[I2C_BR_IDX] = data->br; + buf[I2C_ADDR_IDX] = i2c_8bit_addr_from_msg(msg_temp); + if (msg_temp->flags & I2C_M_RD) { + buf[I2C_R_CNT_IDX] = msg_temp->len; + ret = nct6694_write_msg(data->nct6694, REQUEST_I2C_MOD, + REQUEST_I2C_OFFSET, REQUEST_I2C_LEN, + buf); + if (ret < 0) + return 0; + memcpy(msg_temp->buf, buf + I2C_RD_IDX, msg_temp->len); + } else { + buf[I2C_W_CNT_IDX] = msg_temp->len; + memcpy(buf + I2C_WR_IDX, msg_temp->buf, msg_temp->len); + ret = nct6694_write_msg(data->nct6694, REQUEST_I2C_MOD, + REQUEST_I2C_OFFSET, REQUEST_I2C_LEN, + buf); + if (ret < 0) + return 0; + } + } + + 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; + int ret; + + 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); + + ret = i2c_add_adapter(&data->adapter); + if (ret) { + dev_err(&pdev->dev, "%s: Failed to register I2C Adapter: %pe\n", + __func__, ERR_PTR(ret)); + } + + return ret; +} + +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 = DRVNAME, + }, + .probe = nct6694_i2c_probe, + .remove = nct6694_i2c_remove, +}; + +static int __init nct6694_init(void) +{ + int err; + + err = platform_driver_register(&nct6694_i2c_driver); + if (!err) { + if (err) + platform_driver_unregister(&nct6694_i2c_driver); + } + + return err; +} +subsys_initcall(nct6694_init); + +static void __exit nct6694_exit(void) +{ + platform_driver_unregister(&nct6694_i2c_driver); +} +module_exit(nct6694_exit); + +MODULE_DESCRIPTION("USB-I2C adapter driver for NCT6694"); +MODULE_AUTHOR("Ming Yu "); +MODULE_LICENSE("GPL");