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285 lines
7.2 KiB
285 lines
7.2 KiB
// 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 <[email protected]> |
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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 <[email protected]> and Jean Delvare |
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* <[email protected]>. |
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* |
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* Thanks to James Bolt <[email protected]> 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 int 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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strlcpy(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 int 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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return 0; |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("W83L785TS-S driver"); |
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MODULE_LICENSE("GPL");
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