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[60.250.192.107]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-720bc2c39acsm10382484b3a.137.2024.11.05.18.39.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 05 Nov 2024 18:39:40 -0800 (PST) From: Eason Yang To: avifishman70@gmail.com, tmaimon77@gmail.com, tali.perry1@gmail.com, venture@google.com, yuenn@google.com, benjaminfair@google.com, jic23@kernel.org, lars@metafoo.de, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, nuno.sa@analog.com, dlechner@baylibre.com, javier.carrasco.cruz@gmail.com, andy@kernel.org, marcelo.schmitt@analog.com, olivier.moysan@foss.st.com, mitrutzceclan@gmail.com, matteomartelli3@gmail.com, alisadariana@gmail.com, joao.goncalves@toradex.com, marius.cristea@microchip.com, mike.looijmans@topic.nl, chanh@os.amperecomputing.com, KWLIU@nuvoton.com, yhyang2@nuvoton.com Cc: openbmc@lists.ozlabs.org, linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Eason Yang Subject: [PATCH v1 1/2] dt-bindings: iio: adc: Add binding for Nuvoton NCT720x ADCs Date: Wed, 6 Nov 2024 10:39:15 +0800 Message-Id: <20241106023916.440767-2-j2anfernee@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241106023916.440767-1-j2anfernee@gmail.com> References: <20241106023916.440767-1-j2anfernee@gmail.com> Precedence: bulk X-Mailing-List: linux-iio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 This adds a binding specification for the Nuvoton NCT7201/NCT7202 family of ADCs. Signed-off-by: Eason Yang --- .../bindings/iio/adc/nuvoton,nct720x.yaml | 47 +++++++++++++++++++ MAINTAINERS | 1 + 2 files changed, 48 insertions(+) create mode 100644 Documentation/devicetree/bindings/iio/adc/nuvoton,nct720x.yaml diff --git a/Documentation/devicetree/bindings/iio/adc/nuvoton,nct720x.yaml b/Documentation/devicetree/bindings/iio/adc/nuvoton,nct720x.yaml new file mode 100644 index 000000000000..3052039af10e --- /dev/null +++ b/Documentation/devicetree/bindings/iio/adc/nuvoton,nct720x.yaml @@ -0,0 +1,47 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/iio/adc/nuvoton,nct720x.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Nuvoton nct7202 and similar ADCs + +maintainers: + - Eason Yang + +description: | + Family of ADCs with i2c interface. + +properties: + compatible: + enum: + - nuvoton,nct7201 + - nuvoton,nct7202 + + reg: + maxItems: 1 + + read-vin-data-size: + description: number of data bits per read vin + $ref: /schemas/types.yaml#/definitions/uint32 + enum: [8, 16] + +required: + - compatible + - reg + - read-vin-data-size + +additionalProperties: false + +examples: + - | + i2c { + #address-cells = <1>; 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[60.250.192.107]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-720bc2c39acsm10382484b3a.137.2024.11.05.18.39.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 05 Nov 2024 18:39:45 -0800 (PST) From: Eason Yang To: avifishman70@gmail.com, tmaimon77@gmail.com, tali.perry1@gmail.com, venture@google.com, yuenn@google.com, benjaminfair@google.com, jic23@kernel.org, lars@metafoo.de, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, nuno.sa@analog.com, dlechner@baylibre.com, javier.carrasco.cruz@gmail.com, andy@kernel.org, marcelo.schmitt@analog.com, olivier.moysan@foss.st.com, mitrutzceclan@gmail.com, matteomartelli3@gmail.com, alisadariana@gmail.com, joao.goncalves@toradex.com, marius.cristea@microchip.com, mike.looijmans@topic.nl, chanh@os.amperecomputing.com, KWLIU@nuvoton.com, yhyang2@nuvoton.com Cc: openbmc@lists.ozlabs.org, linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Eason Yang Subject: [PATCH v1 2/2] iio: adc: add Nuvoton NCT720x ADC driver Date: Wed, 6 Nov 2024 10:39:16 +0800 Message-Id: <20241106023916.440767-3-j2anfernee@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241106023916.440767-1-j2anfernee@gmail.com> References: <20241106023916.440767-1-j2anfernee@gmail.com> Precedence: bulk X-Mailing-List: linux-iio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Add Nuvoton NCT7201/NCT7202 system voltage monitor 12-bit ADC driver NCT7201/NCT7202 supports up to 12 analog voltage monitor inputs and up to 4 SMBus addresses by ADDR pin. Meanwhile, ALERT# hardware event pins for independent alarm signals, and the all threshold values could be set for system protection without any timing delay. It also supports reset input RSTIN# to recover system from a fault condition. Currently, only single-edge mode conversion and threshold events support. Signed-off-by: Eason Yang --- MAINTAINERS | 1 + drivers/iio/adc/Kconfig | 9 + drivers/iio/adc/Makefile | 1 + drivers/iio/adc/nct720x.c | 617 ++++++++++++++++++++++++++++++++++++++ 4 files changed, 628 insertions(+) create mode 100644 drivers/iio/adc/nct720x.c diff --git a/MAINTAINERS b/MAINTAINERS index 68570c58e7aa..9940de0ddca2 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2753,6 +2753,7 @@ F: arch/arm/mach-npcm/ F: arch/arm64/boot/dts/nuvoton/ F: drivers/*/*/*npcm* F: drivers/*/*npcm* +F: drivers/iio/adc/nct720x.c F: drivers/rtc/rtc-nct3018y.c F: include/dt-bindings/clock/nuvoton,npcm7xx-clock.h F: include/dt-bindings/clock/nuvoton,npcm845-clk.h diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index 6c4e74420fd2..adbbf0ca6f57 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -1008,6 +1008,15 @@ config NAU7802 To compile this driver as a module, choose M here: the module will be called nau7802. +config NCT720X + tristate "Nuvoton Instruments NCT7201 and NCT7202 Power Monitor" + depends on I2C + help + If you say yes here you get support for the Nuvoton NCT7201 and + NCT7202 Voltage Monitor. + This driver can also be built as a module. If so, the module + will be called nct720x. + config NPCM_ADC tristate "Nuvoton NPCM ADC driver" depends on ARCH_NPCM || COMPILE_TEST diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile index 7b91cd98c0e0..f53318e5aa04 100644 --- a/drivers/iio/adc/Makefile +++ b/drivers/iio/adc/Makefile @@ -91,6 +91,7 @@ obj-$(CONFIG_MESON_SARADC) += meson_saradc.o obj-$(CONFIG_MP2629_ADC) += mp2629_adc.o obj-$(CONFIG_MXS_LRADC_ADC) += mxs-lradc-adc.o obj-$(CONFIG_NAU7802) += nau7802.o +obj-$(CONFIG_NCT720X) += nct720x.o obj-$(CONFIG_NPCM_ADC) += npcm_adc.o obj-$(CONFIG_PAC1921) += pac1921.o obj-$(CONFIG_PAC1934) += pac1934.o diff --git a/drivers/iio/adc/nct720x.c b/drivers/iio/adc/nct720x.c new file mode 100644 index 000000000000..e589479fd06e --- /dev/null +++ b/drivers/iio/adc/nct720x.c @@ -0,0 +1,617 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Driver for Nuvoton nct7201 and nct7202 power monitor chips. + * + * Copyright (c) 2022 Nuvoton Inc. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define REG_CHIP_ID 0xFD +#define NCT720X_ID 0xD7 +#define REG_VENDOR_ID 0xFE +#define NUVOTON_ID 0x50 +#define REG_DEVICE_ID 0xFF +#define NCT720X_DEVICE_ID 0x12 +#define VIN_MAX 12 /* Counted from 1 */ +#define NCT7201_VIN_MAX 8 +#define NCT7202_VIN_MAX 12 +#define NCT720X_IN_SCALING 4995 + +#define REG_INTERRUPT_STATUS_1 0x0C +#define REG_INTERRUPT_STATUS_2 0x0D +#define REG_VOLT_LOW_BYTE 0x0F +#define REG_CONFIGURATION 0x10 +#define CONFIGURATION_START BIT(0) +#define CONFIGURATION_ALERT_MSK BIT(1) +#define CONFIGURATION_CONV_RATE BIT(2) +#define CONFIGURATION_INIT BIT(7) + +#define REG_ADVANCED_CONFIGURATION 0x11 +#define ADVANCED_CONF_MOD_ALERT BIT(0) +#define ADVANCED_CONF_MOD_STS BIT(1) +#define ADVANCED_CONF_FAULT_QUEUE BIT(2) +#define ADVANCED_CONF_EN_DEEP_SHUTDOWN BIT(4) +#define ADVANCED_CONF_EN_SMB_TIMEOUT BIT(5) +#define ADVANCED_CONF_MOD_RSTIN BIT(7) + +#define REG_CHANNEL_INPUT_MODE 0x12 +#define REG_CHANNEL_ENABLE_1 0x13 +#define REG_CHANNEL_ENABLE_2 0x14 +#define REG_INTERRUPT_MASK_1 0x15 +#define REG_INTERRUPT_MASK_2 0x16 +#define REG_BUSY_STATUS 0x1E +#define REG_ONE_SHOT 0x1F +#define REG_SMUS_ADDRESS 0xFC + +static const u8 REG_VIN[VIN_MAX] = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, + 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B}; +static const u8 REG_VIN_HIGH_LIMIT[VIN_MAX] = { 0x20, 0x22, 0x24, 0x26, 0x28, 0x2A, + 0x2C, 0x2E, 0x30, 0x32, 0x34, 0x36}; +static const u8 REG_VIN_LOW_LIMIT[VIN_MAX] = { 0x21, 0x23, 0x25, 0x27, 0x29, 0x2B, + 0x2D, 0x2F, 0x31, 0x33, 0x35, 0x37}; +static const u8 REG_VIN_HIGH_LIMIT_LSB[VIN_MAX] = { 0x40, 0x42, 0x44, 0x46, 0x48, 0x4A, + 0x4C, 0x4E, 0x50, 0x52, 0x54, 0x56}; +static const u8 REG_VIN_LOW_LIMIT_LSB[VIN_MAX] = { 0x41, 0x43, 0x45, 0x47, 0x49, 0x4B, + 0x4D, 0x4F, 0x51, 0x53, 0x55, 0x57}; +static u8 nct720x_chan_to_index[] = { + 0, /* Not used */ + 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 +}; + + +/* List of supported devices */ +enum nct720x_chips { + nct7201, nct7202 +}; + +struct nct720x_chip_info { + struct i2c_client *client; + enum nct720x_chips type; + struct mutex access_lock; /* for multi-byte read and write operations */ + int vin_max; /* number of VIN channels */ + u32 vin_mask; + bool use_read_byte_vin; +}; + +static const struct iio_event_spec nct720x_events[] = { + { + .type = IIO_EV_TYPE_THRESH, + .dir = IIO_EV_DIR_RISING, + .mask_separate = BIT(IIO_EV_INFO_VALUE) | + BIT(IIO_EV_INFO_ENABLE), + }, { + .type = IIO_EV_TYPE_THRESH, + .dir = IIO_EV_DIR_FALLING, + .mask_separate = BIT(IIO_EV_INFO_VALUE) | + BIT(IIO_EV_INFO_ENABLE), + }, +}; + +#define NCT720X_VOLTAGE_CHANNEL(chan, addr) \ + { \ + .type = IIO_VOLTAGE, \ + .indexed = 1, \ + .channel = chan, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), \ + .address = addr, \ + .event_spec = nct720x_events, \ + .num_event_specs = ARRAY_SIZE(nct720x_events), \ + } + +#define NCT720X_VOLTAGE_CHANNEL_DIFF(chan1, chan2, addr) \ + { \ + .type = IIO_VOLTAGE, \ + .indexed = 1, \ + .channel = (chan1), \ + .channel2 = (chan2), \ + .differential = 1, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), \ + .address = addr, \ + .event_spec = nct720x_events, \ + .num_event_specs = ARRAY_SIZE(nct720x_events), \ + } + +static const struct iio_chan_spec nct720x_channels[] = { + NCT720X_VOLTAGE_CHANNEL(1, 1), + NCT720X_VOLTAGE_CHANNEL(2, 2), + NCT720X_VOLTAGE_CHANNEL(3, 3), + NCT720X_VOLTAGE_CHANNEL(4, 4), + NCT720X_VOLTAGE_CHANNEL(5, 5), + NCT720X_VOLTAGE_CHANNEL(6, 6), + NCT720X_VOLTAGE_CHANNEL(7, 7), + NCT720X_VOLTAGE_CHANNEL(8, 8), + NCT720X_VOLTAGE_CHANNEL(9, 9), + NCT720X_VOLTAGE_CHANNEL(10, 10), + NCT720X_VOLTAGE_CHANNEL(11, 11), + NCT720X_VOLTAGE_CHANNEL(12, 12), + NCT720X_VOLTAGE_CHANNEL_DIFF(1, 2, 1), + NCT720X_VOLTAGE_CHANNEL_DIFF(3, 4, 3), + NCT720X_VOLTAGE_CHANNEL_DIFF(5, 6, 5), + NCT720X_VOLTAGE_CHANNEL_DIFF(7, 8, 7), + NCT720X_VOLTAGE_CHANNEL_DIFF(9, 10, 9), + NCT720X_VOLTAGE_CHANNEL_DIFF(11, 12, 11), +}; + +/* Read 1-byte register. Returns unsigned byte data or -ERRNO on error. */ +static int nct720x_read_reg(struct nct720x_chip_info *chip, u8 reg) +{ + struct i2c_client *client = chip->client; + + return i2c_smbus_read_byte_data(client, reg); +} + +/* Read 1-byte register. Returns unsigned word data or -ERRNO on error. */ +static int nct720x_read_word_swapped_reg(struct nct720x_chip_info *chip, u8 reg) +{ + struct i2c_client *client = chip->client; + + return i2c_smbus_read_word_swapped(client, reg); +} + +/* + * Read 2-byte register. Returns register in big-endian format or + * -ERRNO on error. + */ +static int nct720x_read_reg16(struct nct720x_chip_info *chip, u8 reg) +{ + struct i2c_client *client = chip->client; + int ret, low; + + mutex_lock(&chip->access_lock); + ret = i2c_smbus_read_byte_data(client, reg); + if (ret >= 0) { + low = ret; + ret = i2c_smbus_read_byte_data(client, reg + 1); + if (ret >= 0) + ret = low | (ret << 8); + } + + mutex_unlock(&chip->access_lock); + return ret; +} + +/* Write 1-byte register. Returns 0 or -ERRNO on error. */ +static int nct720x_write_reg(struct nct720x_chip_info *chip, u8 reg, u8 val) +{ + struct i2c_client *client = chip->client; + int err; + + err = i2c_smbus_write_byte_data(client, reg, val); + /* wait for write command to be finished */ + mdelay(10); + + return err; +} + +static int nct720x_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + int index = nct720x_chan_to_index[chan->address]; + int v1, v2, volt, err; + struct nct720x_chip_info *chip = iio_priv(indio_dev); + + if (chan->type != IIO_VOLTAGE) + return -EOPNOTSUPP; + + switch (mask) { + case IIO_CHAN_INFO_PROCESSED: + mutex_lock(&chip->access_lock); + if (chip->use_read_byte_vin) { + /* + * MNTVIN Low Byte together with MNTVIN High Byte + * forms the 13-bit count value. If MNTVIN High + * Byte readout is read successively, the + * NCT7201/NCT7202 will latch the MNTVIN Low Byte + * for next read. + */ + v1 = nct720x_read_reg(chip, REG_VIN[index]); + if (v1 < 0) { + err = v1; + goto abort; + } + + v2 = nct720x_read_reg(chip, REG_VOLT_LOW_BYTE); + if (v2 < 0) { + err = v2; + goto abort; + } + volt = (v1 << 8) | v2; /* Convert back to 16-bit value */ + } else { + /* NCT7201/NCT7202 also supports read word-size data */ + volt = nct720x_read_word_swapped_reg(chip, REG_VIN[index]); + } + + /* Voltage(V) = 13bitCountValue * 0.0004995 */ + volt = (volt >> 3) * NCT720X_IN_SCALING; + *val = volt / 10000; + mutex_unlock(&chip->access_lock); + return IIO_VAL_INT; + default: + return -EINVAL; + } +abort: + mutex_unlock(&chip->access_lock); + return err; +} + +static int nct720x_read_event_value(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir, + enum iio_event_info info, + int *val, int *val2) +{ + struct nct720x_chip_info *chip = iio_priv(indio_dev); + int v1, v2, err; + int volt = 0; + int index = nct720x_chan_to_index[chan->address]; + + if (chan->type != IIO_VOLTAGE) + return -EOPNOTSUPP; + + if (info == IIO_EV_INFO_VALUE) { + if (dir == IIO_EV_DIR_FALLING) { + if (chip->use_read_byte_vin) { + /* + * Low limit VIN Low Byte together with Low limit VIN High Byte + forms the 13-bit count value + */ + mutex_lock(&chip->access_lock); + v1 = nct720x_read_reg(chip, REG_VIN_LOW_LIMIT[index]); + if (v1 < 0) { + err = v1; + goto abort; + } + + v2 = nct720x_read_reg(chip, REG_VIN_LOW_LIMIT_LSB[index]); + if (v2 < 0) { + err = v2; + goto abort; + } + mutex_unlock(&chip->access_lock); + volt = (v1 << 8) | v2; /* Convert back to 16-bit value */ + } else { + /* NCT7201/NCT7202 also supports read word-size data */ + volt = nct720x_read_word_swapped_reg(chip, + REG_VIN_LOW_LIMIT[index]); + } + } else { + if (chip->use_read_byte_vin) { + /* + * High limit VIN Low Byte together with high limit VIN High Byte + * forms the 13-bit count value + */ + mutex_lock(&chip->access_lock); + v1 = nct720x_read_reg(chip, REG_VIN_HIGH_LIMIT[index]); + if (v1 < 0) { + err = v1; + goto abort; + } + + v2 = nct720x_read_reg(chip, REG_VIN_HIGH_LIMIT_LSB[index]); + if (v2 < 0) { + err = v2; + goto abort; + } + mutex_unlock(&chip->access_lock); + volt = (v1 << 8) | v2; /* Convert back to 16-bit value */ + } else { + /* NCT7201/NCT7202 also supports read word-size data */ + volt = nct720x_read_word_swapped_reg(chip, + REG_VIN_HIGH_LIMIT[index]); + } + } + } + /* Voltage(V) = 13bitCountValue * 0.0004995 */ + volt = (volt >> 3) * NCT720X_IN_SCALING; + *val = volt / 10000; + + return IIO_VAL_INT; +abort: + mutex_unlock(&chip->access_lock); + return err; +} + +static int nct720x_write_event_value(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir, + enum iio_event_info info, + int val, int val2) +{ + struct nct720x_chip_info *chip = iio_priv(indio_dev); + int index, err = 0; + long v1, v2, volt; + + index = nct720x_chan_to_index[chan->address]; + volt = (val * 10000) / NCT720X_IN_SCALING; + v1 = volt >> 5; + v2 = (volt & 0x1f) << 3; + + if (chan->type != IIO_VOLTAGE) + return -EOPNOTSUPP; + + if (info == IIO_EV_INFO_VALUE) { + if (dir == IIO_EV_DIR_FALLING) { + mutex_lock(&chip->access_lock); + err = nct720x_write_reg(chip, REG_VIN_LOW_LIMIT[index], v1); + if (err < 0) { + pr_err("Failed to write REG_VIN%d_LOW_LIMIT\n", index + 1); + goto abort; + } + + err = nct720x_write_reg(chip, REG_VIN_LOW_LIMIT_LSB[index], v2); + if (err < 0) { + pr_err("Failed to write REG_VIN%d_LOW_LIMIT_LSB\n", index + 1); + goto abort; + } + } else { + mutex_lock(&chip->access_lock); + err = nct720x_write_reg(chip, REG_VIN_HIGH_LIMIT[index], v1); + if (err < 0) { + pr_err("Failed to write REG_VIN%d_HIGH_LIMIT\n", index + 1); + goto abort; + } + + err = nct720x_write_reg(chip, REG_VIN_HIGH_LIMIT_LSB[index], v2); + if (err < 0) { + pr_err("Failed to write REG_VIN%d_HIGH_LIMIT_LSB\n", index + 1); + goto abort; + } + } + } +abort: + mutex_unlock(&chip->access_lock); + return err; +} + +static int nct720x_read_event_config(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir) +{ + struct nct720x_chip_info *chip = iio_priv(indio_dev); + int index = nct720x_chan_to_index[chan->address]; + + if (chan->type != IIO_VOLTAGE) + return -EOPNOTSUPP; + + return !!(chip->vin_mask & BIT(index)); +} + +static int nct720x_write_event_config(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + enum iio_event_type type, + enum iio_event_direction dir, + int state) +{ + int err = 0; + struct nct720x_chip_info *chip = iio_priv(indio_dev); + int index = nct720x_chan_to_index[chan->address]; + unsigned int mask; + + mask = BIT(index); + + if (chan->type != IIO_VOLTAGE) + return -EOPNOTSUPP; + + if (!state && (chip->vin_mask & mask)) + chip->vin_mask &= ~mask; + else if (state && !(chip->vin_mask & mask)) + chip->vin_mask |= mask; + + mutex_lock(&chip->access_lock); + + err = nct720x_write_reg(chip, REG_CHANNEL_ENABLE_1, chip->vin_mask & 0xff); + if (err < 0) { + pr_err("Failed to write REG_CHANNEL_ENABLE_1\n"); + goto abort; + } + + if (chip->type == nct7202) { + err = nct720x_write_reg(chip, REG_CHANNEL_ENABLE_2, chip->vin_mask >> 8); + if (err < 0) { + pr_err("Failed to write REG_CHANNEL_ENABLE_2\n"); + goto abort; + } + } +abort: + mutex_unlock(&chip->access_lock); + return err; +} + +static int nct720x_detect(struct i2c_client *client, + struct i2c_board_info *info) +{ + struct i2c_adapter *adapter = client->adapter; + + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | + I2C_FUNC_SMBUS_WORD_DATA)) + return -ENODEV; + + /* Determine the chip type. */ + if (i2c_smbus_read_byte_data(client, REG_VENDOR_ID) != NUVOTON_ID || + i2c_smbus_read_byte_data(client, REG_CHIP_ID) != NCT720X_ID || + i2c_smbus_read_byte_data(client, REG_DEVICE_ID) != NCT720X_DEVICE_ID) + return -ENODEV; + + strscpy(info->type, "nct720x", I2C_NAME_SIZE); + + return 0; +} + +static const struct iio_info nct720x_info = { + .read_raw = &nct720x_read_raw, + .read_event_config = &nct720x_read_event_config, + .write_event_config = &nct720x_write_event_config, + .read_event_value = &nct720x_read_event_value, + .write_event_value = &nct720x_write_event_value, +}; + +static const struct i2c_device_id nct720x_id[]; + +static int nct720x_init_chip(struct nct720x_chip_info *chip) +{ + int value = 0; + int err = 0; + + /* Initial reset */ + err = nct720x_write_reg(chip, REG_CONFIGURATION, CONFIGURATION_INIT); + if (err) { + pr_err("Failed to write REG_CONFIGURATION\n"); + return err; + } + + /* Enable Channel */ + err = nct720x_write_reg(chip, REG_CHANNEL_ENABLE_1, 0xff); + if (err) { + pr_err("Failed to write REG_CHANNEL_ENABLE_1\n"); + return err; + } + + if (chip->type == nct7202) { + err = nct720x_write_reg(chip, REG_CHANNEL_ENABLE_2, 0xf); + if (err) { + pr_err("Failed to write REG_CHANNEL_ENABLE_2\n"); + return err; + } + } + + value = nct720x_read_reg16(chip, REG_CHANNEL_ENABLE_1); + if (value < 0) + return value; + chip->vin_mask = value; + + /* Start monitoring if needed */ + value = nct720x_read_reg(chip, REG_CONFIGURATION); + if (value < 0) { + pr_err("Failed to read REG_CONFIGURATION\n"); + return value; + } + + value |= CONFIGURATION_START; + err = nct720x_write_reg(chip, REG_CONFIGURATION, value); + if (err < 0) { + pr_err("Failed to write REG_CONFIGURATION\n"); + return err; + } + + return 0; +} + +static int nct720x_probe(struct i2c_client *client) +{ + const struct i2c_device_id *id = i2c_client_get_device_id(client); + struct nct720x_chip_info *chip; + struct iio_dev *indio_dev; + int ret; + u32 tmp; + + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip)); + if (!indio_dev) + return -ENOMEM; + chip = iio_priv(indio_dev); + + if (client->dev.of_node) + chip->type = (enum nct720x_chips)device_get_match_data(&client->dev); + else + chip->type = i2c_match_id(nct720x_id, client)->driver_data; + + chip->vin_max = (chip->type == nct7201) ? NCT7201_VIN_MAX : NCT7202_VIN_MAX; + + ret = of_property_read_u32(client->dev.of_node, "read-vin-data-size", &tmp); + if (ret < 0) { + pr_err("read-vin-data-size property not found\n"); + return ret; + } + + if (tmp == 8) { + chip->use_read_byte_vin = true; + } else if (tmp == 16) { + chip->use_read_byte_vin = false; + } else { + pr_err("invalid read-vin-data-size (%d)\n", tmp); + return -EINVAL; + } + + mutex_init(&chip->access_lock); + + /* this is only used for device removal purposes */ + i2c_set_clientdata(client, indio_dev); + + chip->client = client; + + ret = nct720x_init_chip(chip); + if (ret < 0) + return ret; + + indio_dev->name = id->name; + indio_dev->channels = nct720x_channels; + indio_dev->num_channels = ARRAY_SIZE(nct720x_channels); + indio_dev->info = &nct720x_info; + indio_dev->modes = INDIO_DIRECT_MODE; + + iio_device_register(indio_dev); + + return 0; +} + +static void nct720x_remove(struct i2c_client *client) +{ + struct iio_dev *indio_dev = i2c_get_clientdata(client); + + iio_device_unregister(indio_dev); +} + +static const unsigned short nct720x_address_list[] = { + 0x1d, 0x1e, 0x35, 0x36, I2C_CLIENT_END +}; + +static const struct i2c_device_id nct720x_id[] = { + { "nct7201", nct7201 }, + { "nct7202", nct7202 }, + {} +}; +MODULE_DEVICE_TABLE(i2c, nct720x_id); + +static const struct of_device_id nct720x_of_match[] = { + { + .compatible = "nuvoton,nct7201", + .data = (void *)nct7201 + }, + { + .compatible = "nuvoton,nct7202", + .data = (void *)nct7202 + }, + { }, +}; + +MODULE_DEVICE_TABLE(of, nct720x_of_match); + +static struct i2c_driver nct720x_driver = { + .driver = { + .name = "nct720x", + .of_match_table = nct720x_of_match, + }, + .probe = nct720x_probe, + .remove = nct720x_remove, + .id_table = nct720x_id, + .detect = nct720x_detect, + .address_list = nct720x_address_list, +}; + +module_i2c_driver(nct720x_driver); + +MODULE_AUTHOR("Eason Yang "); +MODULE_DESCRIPTION("Nuvoton NCT720x voltage monitor driver"); +MODULE_LICENSE("GPL");