Nuvoton W83773G is a hardware monitor IC providing one local temperature and two remote temperature sensors.
Signed-off-by: Lei YU <mine260...@gmail.com> --- drivers/hwmon/Kconfig | 11 ++ drivers/hwmon/Makefile | 1 + drivers/hwmon/w83773g.c | 276 ++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 288 insertions(+) create mode 100644 drivers/hwmon/w83773g.c diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index d654314..d148b70 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -1710,6 +1710,17 @@ config SENSORS_VT8231 This driver can also be built as a module. If so, the module will be called vt8231. +config SENSORS_W83773G + tristate "Nuvoton W83773G" + depends on I2C + select HWMON_VID + help + If you say yes here you get support for the Nuvoton W83773G hardware + monitoring chip. + + This driver can also be built as a module. If so, the module + will be called w83773g. + config SENSORS_W83781D tristate "Winbond W83781D, W83782D, W83783S, Asus AS99127F" depends on I2C diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile index c84d978..0649ad8 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile @@ -13,6 +13,7 @@ obj-$(CONFIG_SENSORS_ATK0110) += asus_atk0110.o # asb100, then w83781d go first, as they can override other drivers' addresses. obj-$(CONFIG_SENSORS_ASB100) += asb100.o obj-$(CONFIG_SENSORS_W83627HF) += w83627hf.o +obj-$(CONFIG_SENSORS_W83773G) += w83773g.o obj-$(CONFIG_SENSORS_W83792D) += w83792d.o obj-$(CONFIG_SENSORS_W83793) += w83793.o obj-$(CONFIG_SENSORS_W83795) += w83795.o diff --git a/drivers/hwmon/w83773g.c b/drivers/hwmon/w83773g.c new file mode 100644 index 0000000..16d5fa0 --- /dev/null +++ b/drivers/hwmon/w83773g.c @@ -0,0 +1,276 @@ +/* + * Copyright (C) 2017 IBM Corp. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + */ + +/* + * Driver for the Nuvoton W83773G SMBus temperature sensor IC. + * Supported models: W83773G + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/jiffies.h> +#include <linux/i2c.h> +#include <linux/hwmon.h> +#include <linux/hwmon-sysfs.h> +#include <linux/err.h> +#include <linux/mutex.h> +#include <linux/of_device.h> +#include <linux/sysfs.h> + +/* Addresses to scan */ +static const unsigned short normal_i2c[] = { 0x4c, 0x4d, I2C_CLIENT_END }; + +enum chips { w83773g }; + +/* The W83773 registers */ +#define W83773_CONVERSION_RATE_REG_READ 0x04 +#define W83773_CONVERSION_RATE_REG_WRITE 0x0A +#define W83773_MANUFACTURER_ID_REG 0xFE +#define W83773_LOCAL_TEMP 0x00 + +static const u8 W83773_STATUS[2] = { 0x02, 0x17 }; + +static const u8 W83773_TEMP_LSB[2] = { 0x10, 0x25 }; +static const u8 W83773_TEMP_MSB[2] = { 0x01, 0x24 }; + +static const u8 W83773_OFFSET_LSB[2] = { 0x12, 0x16 }; +static const u8 W83773_OFFSET_MSB[2] = { 0x11, 0x15 }; + +/* Manufacturer / Device ID's */ +#define W83773_MANUFACTURER_ID 0x5c + + +/* this is the number of sensors in the device */ +static const struct i2c_device_id w83773_id[] = { + { "w83773g", 3 }, + { } +}; + +MODULE_DEVICE_TABLE(i2c, w83773_id); + +static const struct of_device_id w83773_of_match[] = { + { + .compatible = "nuvoton,w83773g", + .data = (void *)3 + }, + + { }, +}; +MODULE_DEVICE_TABLE(of, w83773_of_match); + +/* + * W83773G has 3 temp sensors: + * Channel 0 is the local sensor + * Channel 1-2 are two remote sensors + */ +struct w83773_data { + struct i2c_client *client; + struct mutex update_lock; + u32 temp_config[4]; + struct hwmon_channel_info temp_info; + const struct hwmon_channel_info *info[2]; + struct hwmon_chip_info chip; + bool valid; + unsigned long last_updated; + int channels; + s8 temp_local; + s8 status[2]; + s8 temp_hb[2]; + s8 temp_lb[2]; + s8 offset_hb[2]; + s8 offset_lb[2]; +}; + +static long temp_of_local(s8 reg) +{ + return reg * 1000; +} + +static long temp_of_remote(s8 hb, s8 lb, s8 offset_hb, s8 offset_lb) +{ + return (hb + offset_hb) * 1000 + ((u8)(lb + offset_lb) >> 5) * 125; +} + + +static struct w83773_data *w83773_update_device(struct device *dev) +{ + struct w83773_data *data = dev_get_drvdata(dev); + struct i2c_client *client = data->client; + int i; + + mutex_lock(&data->update_lock); + + if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) { + data->temp_local = i2c_smbus_read_byte_data(client, W83773_LOCAL_TEMP); + for (i = 0; i < data->channels - 1; i++) { + data->status[i] = i2c_smbus_read_byte_data(client, W83773_STATUS[i]); + data->temp_hb[i] = i2c_smbus_read_byte_data(client, W83773_TEMP_MSB[i]); + data->temp_lb[i] = i2c_smbus_read_byte_data(client, W83773_TEMP_LSB[i]); + data->offset_hb[i] = i2c_smbus_read_byte_data(client, W83773_OFFSET_MSB[i]); + data->offset_lb[i] = i2c_smbus_read_byte_data(client, W83773_OFFSET_LSB[i]); + } + data->last_updated = jiffies; + data->valid = true; + } + + mutex_unlock(&data->update_lock); + + return data; +} + +static int w83773_read(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, long *val) +{ + struct w83773_data *w83773 = w83773_update_device(dev); + + switch (attr) { + case hwmon_temp_input: + if (channel == 0) { + /* channel 0 is the local temp */ + *val = temp_of_local(w83773->temp_local); + } + else { + /* channel 1-2 are the remote temps */ + channel--; + *val = temp_of_remote( + w83773->temp_hb[channel], + w83773->temp_lb[channel], + w83773->offset_hb[channel], + w83773->offset_lb[channel]); + } + return 0; + case hwmon_temp_fault: + if (channel == 0) + *val = 0; + else + /* Check the status register bit 2 for faults */ + *val = (w83773->status[channel - 1] & 0x04) >> 2; + return 0; + default: + return -EOPNOTSUPP; + } + +} + +static umode_t w83773_is_visible(const void *data, enum hwmon_sensor_types type, + u32 attr, int channel) +{ + switch (attr) { + case hwmon_temp_fault: + if (channel == 0) + return 0; + return S_IRUGO; + case hwmon_temp_input: + return S_IRUGO; + default: + return 0; + } +} + +static int w83773_init_client(struct i2c_client *client) +{ + /* Set the conversion rate to 2 Hz */ + i2c_smbus_write_byte_data(client, W83773_CONVERSION_RATE_REG_WRITE, 0x05); + + return 0; +} + +static int w83773_detect(struct i2c_client *client, + struct i2c_board_info *info) +{ + enum chips kind; + struct i2c_adapter *adapter = client->adapter; + const char * const names[] = { "W83773G" }; + u8 reg; + + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) + return -ENODEV; + + reg = i2c_smbus_read_byte_data(client, W83773_MANUFACTURER_ID_REG); + if (reg != W83773_MANUFACTURER_ID) + return -ENODEV; + + reg = i2c_smbus_read_byte_data(client, W83773_CONVERSION_RATE_REG_READ); + if (reg & 0xf8) + return -ENODEV; + + kind = w83773g; + + strlcpy(info->type, w83773_id[kind].name, I2C_NAME_SIZE); + dev_info(&adapter->dev, "Detected Nuvoton %s chip at 0x%02x\n", + names[kind], client->addr); + + return 0; +} + +static const struct hwmon_ops w83773_ops = { + .is_visible = w83773_is_visible, + .read = w83773_read, +}; + +static int w83773_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct device *dev = &client->dev; + struct device *hwmon_dev; + struct w83773_data *data; + int i, err; + + data = devm_kzalloc(dev, sizeof(struct w83773_data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + mutex_init(&data->update_lock); + if (client->dev.of_node) + data->channels = (int)of_device_get_match_data(&client->dev); + else + data->channels = id->driver_data; + data->client = client; + + err = w83773_init_client(client); + if (err) + return err; + + for (i = 0; i < data->channels; i++) + data->temp_config[i] = HWMON_T_INPUT | HWMON_T_FAULT; + + data->chip.ops = &w83773_ops; + data->chip.info = data->info; + + data->info[0] = &data->temp_info; + + data->temp_info.type = hwmon_temp; + data->temp_info.config = data->temp_config; + + hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, + data, + &data->chip, + NULL); + return PTR_ERR_OR_ZERO(hwmon_dev); +} + +static struct i2c_driver w83773_driver = { + .class = I2C_CLASS_HWMON, + .driver = { + .name = "w83773g", + .of_match_table = of_match_ptr(w83773_of_match), + }, + .probe = w83773_probe, + .id_table = w83773_id, + .detect = w83773_detect, + .address_list = normal_i2c, +}; + +module_i2c_driver(w83773_driver); + +MODULE_AUTHOR("Nickolaus Gruendler <ngru...@us.ibm.com>"); +MODULE_DESCRIPTION("W83773G temperature sensor driver"); +MODULE_LICENSE("GPL"); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-hwmon" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html