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Date: Thu, 2 Nov 2017 14:33:57 +0800
From: Lei YU <mine260309@...il.com>
To: Jean Delvare <jdelvare@...e.com>,
Guenter Roeck <linux@...ck-us.net>
Cc: Lei YU <mine260309@...il.com>, linux-kernel@...r.kernel.org,
linux-hwmon@...r.kernel.org, Joel Stanley <joel@....id.au>,
Andrew Jeffery <andrew@...id.au>
Subject: [PATCH 1/2] drivers: hwmon: Add W83773G driver
Nuvoton W83773G is a hardware monitor IC providing one local
temperature and two remote temperature sensors.
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");
--
1.9.1
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