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Date: Thu, 2 Nov 2017 07:04:00 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Lei YU <mine260309@...il.com>, Jean Delvare <jdelvare@...e.com>
Cc: linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org,
Joel Stanley <joel@....id.au>, Andrew Jeffery <andrew@...id.au>
Subject: Re: [PATCH 1/2] drivers: hwmon: Add W83773G driver
On 11/01/2017 11:33 PM, Lei YU wrote:
> Nuvoton W83773G is a hardware monitor IC providing one local
> temperature and two remote temperature sensors.
>
This chip is pretty close to LM90. Have you explored adding support for it
to the LM90 driver ?
> Signed-off-by: Lei YU <mine260309@...il.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 <ngruend@...ibm.com>");
> +MODULE_DESCRIPTION("W83773G temperature sensor driver");
> +MODULE_LICENSE("GPL");
>
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