// SPDX-License-Identifier: GPL-2.0-or-later /* * w83l785ts.c - Part of lm_sensors, Linux kernel modules for hardware * monitoring * Copyright (C) 2003-2009 Jean Delvare <[email protected]> * * Inspired from the lm83 driver. The W83L785TS-S is a sensor chip made * by Winbond. It reports a single external temperature with a 1 deg * resolution and a 3 deg accuracy. Datasheet can be obtained from * Winbond's website at: * http://www.winbond-usa.com/products/winbond_products/pdfs/PCIC/W83L785TS-S.pdf * * Ported to Linux 2.6 by Wolfgang Ziegler <[email protected]> and Jean Delvare * <[email protected]>. * * Thanks to James Bolt <[email protected]> for benchmarking the read * error handling mechanism. */ #include <linux/module.h> #include <linux/delay.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> /* How many retries on register read error */ #define MAX_RETRIES … /* * Address to scan * Address is fully defined internally and cannot be changed. */ static const unsigned short normal_i2c[] = …; /* * The W83L785TS-S registers * Manufacturer ID is 0x5CA3 for Winbond. */ #define W83L785TS_REG_MAN_ID1 … #define W83L785TS_REG_MAN_ID2 … #define W83L785TS_REG_CHIP_ID … #define W83L785TS_REG_CONFIG … #define W83L785TS_REG_TYPE … #define W83L785TS_REG_TEMP … #define W83L785TS_REG_TEMP_OVER … /* * Conversions * The W83L785TS-S uses signed 8-bit values. */ #define TEMP_FROM_REG(val) … /* * Functions declaration */ static int w83l785ts_probe(struct i2c_client *client); static int w83l785ts_detect(struct i2c_client *client, struct i2c_board_info *info); static void w83l785ts_remove(struct i2c_client *client); static u8 w83l785ts_read_value(struct i2c_client *client, u8 reg, u8 defval); static struct w83l785ts_data *w83l785ts_update_device(struct device *dev); /* * Driver data (common to all clients) */ static const struct i2c_device_id w83l785ts_id[] = …; MODULE_DEVICE_TABLE(i2c, w83l785ts_id); static struct i2c_driver w83l785ts_driver = …; /* * Client data (each client gets its own) */ struct w83l785ts_data { … }; /* * Sysfs stuff */ static ssize_t show_temp(struct device *dev, struct device_attribute *devattr, char *buf) { … } static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0); static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp, NULL, 1); /* * Real code */ /* Return 0 if detection is successful, -ENODEV otherwise */ static int w83l785ts_detect(struct i2c_client *client, struct i2c_board_info *info) { … } static int w83l785ts_probe(struct i2c_client *client) { … } static void w83l785ts_remove(struct i2c_client *client) { … } static u8 w83l785ts_read_value(struct i2c_client *client, u8 reg, u8 defval) { … } static struct w83l785ts_data *w83l785ts_update_device(struct device *dev) { … } module_i2c_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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