284 lines
7.2 KiB
C
284 lines
7.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* w83l785ts.c - Part of lm_sensors, Linux kernel modules for hardware
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* monitoring
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* Copyright (C) 2003-2009 Jean Delvare <jdelvare@suse.de>
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*
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* Inspired from the lm83 driver. The W83L785TS-S is a sensor chip made
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* by Winbond. It reports a single external temperature with a 1 deg
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* resolution and a 3 deg accuracy. Datasheet can be obtained from
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* Winbond's website at:
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* http://www.winbond-usa.com/products/winbond_products/pdfs/PCIC/W83L785TS-S.pdf
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*
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* Ported to Linux 2.6 by Wolfgang Ziegler <nuppla@gmx.at> and Jean Delvare
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* <jdelvare@suse.de>.
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*
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* Thanks to James Bolt <james@evilpenguin.com> for benchmarking the read
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* error handling mechanism.
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*/
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/jiffies.h>
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#include <linux/i2c.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/err.h>
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#include <linux/mutex.h>
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/* How many retries on register read error */
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#define MAX_RETRIES 5
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/*
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* Address to scan
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* Address is fully defined internally and cannot be changed.
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*/
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static const unsigned short normal_i2c[] = { 0x2e, I2C_CLIENT_END };
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/*
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* The W83L785TS-S registers
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* Manufacturer ID is 0x5CA3 for Winbond.
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*/
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#define W83L785TS_REG_MAN_ID1 0x4D
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#define W83L785TS_REG_MAN_ID2 0x4C
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#define W83L785TS_REG_CHIP_ID 0x4E
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#define W83L785TS_REG_CONFIG 0x40
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#define W83L785TS_REG_TYPE 0x52
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#define W83L785TS_REG_TEMP 0x27
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#define W83L785TS_REG_TEMP_OVER 0x53 /* not sure about this one */
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/*
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* Conversions
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* The W83L785TS-S uses signed 8-bit values.
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*/
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#define TEMP_FROM_REG(val) ((val) * 1000)
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/*
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* Functions declaration
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*/
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static int w83l785ts_probe(struct i2c_client *client);
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static int w83l785ts_detect(struct i2c_client *client,
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struct i2c_board_info *info);
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static void w83l785ts_remove(struct i2c_client *client);
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static u8 w83l785ts_read_value(struct i2c_client *client, u8 reg, u8 defval);
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static struct w83l785ts_data *w83l785ts_update_device(struct device *dev);
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/*
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* Driver data (common to all clients)
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*/
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static const struct i2c_device_id w83l785ts_id[] = {
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{ "w83l785ts", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, w83l785ts_id);
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static struct i2c_driver w83l785ts_driver = {
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.class = I2C_CLASS_HWMON,
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.driver = {
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.name = "w83l785ts",
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},
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.probe_new = w83l785ts_probe,
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.remove = w83l785ts_remove,
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.id_table = w83l785ts_id,
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.detect = w83l785ts_detect,
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.address_list = normal_i2c,
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};
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/*
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* Client data (each client gets its own)
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*/
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struct w83l785ts_data {
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struct device *hwmon_dev;
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struct mutex update_lock;
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bool valid; /* false until following fields are valid */
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unsigned long last_updated; /* in jiffies */
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/* registers values */
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s8 temp[2]; /* 0: input, 1: critical limit */
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};
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/*
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* Sysfs stuff
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*/
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static ssize_t show_temp(struct device *dev, struct device_attribute *devattr,
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char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct w83l785ts_data *data = w83l785ts_update_device(dev);
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return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
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}
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static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
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static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp, NULL, 1);
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/*
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* Real code
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*/
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/* Return 0 if detection is successful, -ENODEV otherwise */
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static int w83l785ts_detect(struct i2c_client *client,
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struct i2c_board_info *info)
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{
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struct i2c_adapter *adapter = client->adapter;
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u16 man_id;
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u8 chip_id;
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
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return -ENODEV;
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/* detection */
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if ((w83l785ts_read_value(client, W83L785TS_REG_CONFIG, 0) & 0x80)
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|| (w83l785ts_read_value(client, W83L785TS_REG_TYPE, 0) & 0xFC)) {
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dev_dbg(&adapter->dev,
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"W83L785TS-S detection failed at 0x%02x\n",
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client->addr);
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return -ENODEV;
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}
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/* Identification */
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man_id = (w83l785ts_read_value(client, W83L785TS_REG_MAN_ID1, 0) << 8)
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+ w83l785ts_read_value(client, W83L785TS_REG_MAN_ID2, 0);
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chip_id = w83l785ts_read_value(client, W83L785TS_REG_CHIP_ID, 0);
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if (man_id != 0x5CA3 /* Winbond */
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|| chip_id != 0x70) { /* W83L785TS-S */
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dev_dbg(&adapter->dev,
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"Unsupported chip (man_id=0x%04X, chip_id=0x%02X)\n",
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man_id, chip_id);
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return -ENODEV;
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}
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strscpy(info->type, "w83l785ts", I2C_NAME_SIZE);
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return 0;
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}
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static int w83l785ts_probe(struct i2c_client *client)
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{
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struct w83l785ts_data *data;
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struct device *dev = &client->dev;
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int err;
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data = devm_kzalloc(dev, sizeof(struct w83l785ts_data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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i2c_set_clientdata(client, data);
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mutex_init(&data->update_lock);
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/*
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* Initialize the W83L785TS chip
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* Nothing yet, assume it is already started.
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*/
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err = device_create_file(dev, &sensor_dev_attr_temp1_input.dev_attr);
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if (err)
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return err;
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err = device_create_file(dev, &sensor_dev_attr_temp1_max.dev_attr);
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if (err)
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goto exit_remove;
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/* Register sysfs hooks */
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data->hwmon_dev = hwmon_device_register(dev);
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if (IS_ERR(data->hwmon_dev)) {
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err = PTR_ERR(data->hwmon_dev);
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goto exit_remove;
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}
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return 0;
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exit_remove:
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device_remove_file(dev, &sensor_dev_attr_temp1_input.dev_attr);
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device_remove_file(dev, &sensor_dev_attr_temp1_max.dev_attr);
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return err;
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}
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static void w83l785ts_remove(struct i2c_client *client)
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{
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struct w83l785ts_data *data = i2c_get_clientdata(client);
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hwmon_device_unregister(data->hwmon_dev);
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device_remove_file(&client->dev,
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&sensor_dev_attr_temp1_input.dev_attr);
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device_remove_file(&client->dev,
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&sensor_dev_attr_temp1_max.dev_attr);
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}
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static u8 w83l785ts_read_value(struct i2c_client *client, u8 reg, u8 defval)
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{
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int value, i;
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struct device *dev;
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const char *prefix;
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/*
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* We might be called during detection, at which point the client
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* isn't yet fully initialized, so we can't use dev_dbg on it
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*/
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if (i2c_get_clientdata(client)) {
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dev = &client->dev;
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prefix = "";
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} else {
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dev = &client->adapter->dev;
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prefix = "w83l785ts: ";
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}
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/*
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* Frequent read errors have been reported on Asus boards, so we
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* retry on read errors. If it still fails (unlikely), return the
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* default value requested by the caller.
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*/
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for (i = 1; i <= MAX_RETRIES; i++) {
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value = i2c_smbus_read_byte_data(client, reg);
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if (value >= 0) {
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dev_dbg(dev, "%sRead 0x%02x from register 0x%02x.\n",
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prefix, value, reg);
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return value;
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}
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dev_dbg(dev, "%sRead failed, will retry in %d.\n", prefix, i);
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msleep(i);
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}
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dev_err(dev, "%sCouldn't read value from register 0x%02x.\n", prefix,
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reg);
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return defval;
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}
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static struct w83l785ts_data *w83l785ts_update_device(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct w83l785ts_data *data = i2c_get_clientdata(client);
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mutex_lock(&data->update_lock);
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if (!data->valid || time_after(jiffies, data->last_updated + HZ * 2)) {
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dev_dbg(&client->dev, "Updating w83l785ts data.\n");
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data->temp[0] = w83l785ts_read_value(client,
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W83L785TS_REG_TEMP, data->temp[0]);
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data->temp[1] = w83l785ts_read_value(client,
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W83L785TS_REG_TEMP_OVER, data->temp[1]);
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data->last_updated = jiffies;
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data->valid = true;
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}
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mutex_unlock(&data->update_lock);
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return data;
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}
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module_i2c_driver(w83l785ts_driver);
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MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
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MODULE_DESCRIPTION("W83L785TS-S driver");
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MODULE_LICENSE("GPL");
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