// SPDX-License-Identifier: GPL-2.0-or-later /* * lm87.c * * Copyright (C) 2000 Frodo Looijaard <[email protected]> * Philip Edelbrock <[email protected]> * Stephen Rousset <[email protected]> * Dan Eaton <[email protected]> * Copyright (C) 2004-2008 Jean Delvare <[email protected]> * * Original port to Linux 2.6 by Jeff Oliver. * * The LM87 is a sensor chip made by National Semiconductor. It monitors up * to 8 voltages (including its own power source), up to three temperatures * (its own plus up to two external ones) and up to two fans. The default * configuration is 6 voltages, two temperatures and two fans (see below). * Voltages are scaled internally with ratios such that the nominal value of * each voltage correspond to a register value of 192 (which means a * resolution of about 0.5% of the nominal value). Temperature values are * reported with a 1 deg resolution and a 3-4 deg accuracy. Complete * datasheet can be obtained from National's website at: * http://www.national.com/pf/LM/LM87.html * * Some functions share pins, so not all functions are available at the same * time. Which are depends on the hardware setup. This driver normally * assumes that firmware configured the chip correctly. Where this is not * the case, platform code must set the I2C client's platform_data to point * to a u8 value to be written to the channel register. * For reference, here is the list of exclusive functions: * - in0+in5 (default) or temp3 * - fan1 (default) or in6 * - fan2 (default) or in7 * - VID lines (default) or IRQ lines (not handled by this driver) * * The LM87 additionally features an analog output, supposedly usable to * control the speed of a fan. All new chips use pulse width modulation * instead. The LM87 is the only hardware monitoring chipset I know of * which uses amplitude modulation. Be careful when using this feature. * * This driver also supports the ADM1024, a sensor chip made by Analog * Devices. That chip is fully compatible with the LM87. Complete * datasheet can be obtained from Analog's website at: * https://www.analog.com/en/prod/0,2877,ADM1024,00.html */ #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/hwmon-vid.h> #include <linux/err.h> #include <linux/mutex.h> #include <linux/regulator/consumer.h> /* * Addresses to scan * LM87 has three possible addresses: 0x2c, 0x2d and 0x2e. */ static const unsigned short normal_i2c[] = …; /* * The LM87 registers */ /* nr in 0..5 */ #define LM87_REG_IN(nr) … #define LM87_REG_IN_MAX(nr) … #define LM87_REG_IN_MIN(nr) … /* nr in 0..1 */ #define LM87_REG_AIN(nr) … #define LM87_REG_AIN_MIN(nr) … #define LM87_REG_AIN_MAX(nr) … static u8 LM87_REG_TEMP[3] = …; static u8 LM87_REG_TEMP_HIGH[3] = …; static u8 LM87_REG_TEMP_LOW[3] = …; #define LM87_REG_TEMP_HW_INT_LOCK … #define LM87_REG_TEMP_HW_EXT_LOCK … #define LM87_REG_TEMP_HW_INT … #define LM87_REG_TEMP_HW_EXT … /* nr in 0..1 */ #define LM87_REG_FAN(nr) … #define LM87_REG_FAN_MIN(nr) … #define LM87_REG_AOUT … #define LM87_REG_CONFIG … #define LM87_REG_CHANNEL_MODE … #define LM87_REG_VID_FAN_DIV … #define LM87_REG_VID4 … #define LM87_REG_ALARMS1 … #define LM87_REG_ALARMS2 … #define LM87_REG_COMPANY_ID … #define LM87_REG_REVISION … /* * Conversions and various macros * The LM87 uses signed 8-bit values for temperatures. */ #define IN_FROM_REG(reg, scale) … #define IN_TO_REG(val, scale) … #define TEMP_FROM_REG(reg) … #define TEMP_TO_REG(val) … #define FAN_FROM_REG(reg, div) … #define FAN_TO_REG(val, div) … #define FAN_DIV_FROM_REG(reg) … /* analog out is 9.80mV/LSB */ #define AOUT_FROM_REG(reg) … #define AOUT_TO_REG(val) … /* nr in 0..1 */ #define CHAN_NO_FAN(nr) … #define CHAN_TEMP3 … #define CHAN_VCC_5V … #define CHAN_NO_VID … /* * Client data (each client gets its own) */ struct lm87_data { … }; static inline int lm87_read_value(struct i2c_client *client, u8 reg) { … } static inline int lm87_write_value(struct i2c_client *client, u8 reg, u8 value) { … } static struct lm87_data *lm87_update_device(struct device *dev) { … } /* * Sysfs stuff */ static ssize_t in_input_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static ssize_t in_min_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static ssize_t in_max_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static ssize_t in_min_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { … } static ssize_t in_max_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { … } static SENSOR_DEVICE_ATTR_RO(in0_input, in_input, 0); static SENSOR_DEVICE_ATTR_RW(in0_min, in_min, 0); static SENSOR_DEVICE_ATTR_RW(in0_max, in_max, 0); static SENSOR_DEVICE_ATTR_RO(in1_input, in_input, 1); static SENSOR_DEVICE_ATTR_RW(in1_min, in_min, 1); static SENSOR_DEVICE_ATTR_RW(in1_max, in_max, 1); static SENSOR_DEVICE_ATTR_RO(in2_input, in_input, 2); static SENSOR_DEVICE_ATTR_RW(in2_min, in_min, 2); static SENSOR_DEVICE_ATTR_RW(in2_max, in_max, 2); static SENSOR_DEVICE_ATTR_RO(in3_input, in_input, 3); static SENSOR_DEVICE_ATTR_RW(in3_min, in_min, 3); static SENSOR_DEVICE_ATTR_RW(in3_max, in_max, 3); static SENSOR_DEVICE_ATTR_RO(in4_input, in_input, 4); static SENSOR_DEVICE_ATTR_RW(in4_min, in_min, 4); static SENSOR_DEVICE_ATTR_RW(in4_max, in_max, 4); static SENSOR_DEVICE_ATTR_RO(in5_input, in_input, 5); static SENSOR_DEVICE_ATTR_RW(in5_min, in_min, 5); static SENSOR_DEVICE_ATTR_RW(in5_max, in_max, 5); static SENSOR_DEVICE_ATTR_RO(in6_input, in_input, 6); static SENSOR_DEVICE_ATTR_RW(in6_min, in_min, 6); static SENSOR_DEVICE_ATTR_RW(in6_max, in_max, 6); static SENSOR_DEVICE_ATTR_RO(in7_input, in_input, 7); static SENSOR_DEVICE_ATTR_RW(in7_min, in_min, 7); static SENSOR_DEVICE_ATTR_RW(in7_max, in_max, 7); static ssize_t temp_input_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static ssize_t temp_low_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static ssize_t temp_high_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static ssize_t temp_low_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { … } static ssize_t temp_high_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { … } static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0); static SENSOR_DEVICE_ATTR_RW(temp1_min, temp_low, 0); static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_high, 0); static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_input, 1); static SENSOR_DEVICE_ATTR_RW(temp2_min, temp_low, 1); static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_high, 1); static SENSOR_DEVICE_ATTR_RO(temp3_input, temp_input, 2); static SENSOR_DEVICE_ATTR_RW(temp3_min, temp_low, 2); static SENSOR_DEVICE_ATTR_RW(temp3_max, temp_high, 2); static ssize_t temp1_crit_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static ssize_t temp2_crit_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static DEVICE_ATTR_RO(temp1_crit); static DEVICE_ATTR_RO(temp2_crit); static DEVICE_ATTR(temp3_crit, 0444, temp2_crit_show, NULL); static ssize_t fan_input_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static ssize_t fan_min_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static ssize_t fan_div_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static ssize_t fan_min_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { … } /* * Note: we save and restore the fan minimum here, because its value is * determined in part by the fan clock divider. This follows the principle * of least surprise; the user doesn't expect the fan minimum to change just * because the divider changed. */ static ssize_t fan_div_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { … } static SENSOR_DEVICE_ATTR_RO(fan1_input, fan_input, 0); static SENSOR_DEVICE_ATTR_RW(fan1_min, fan_min, 0); static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0); static SENSOR_DEVICE_ATTR_RO(fan2_input, fan_input, 1); static SENSOR_DEVICE_ATTR_RW(fan2_min, fan_min, 1); static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1); static ssize_t alarms_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static DEVICE_ATTR_RO(alarms); static ssize_t cpu0_vid_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static DEVICE_ATTR_RO(cpu0_vid); static ssize_t vrm_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static ssize_t vrm_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { … } static DEVICE_ATTR_RW(vrm); static ssize_t aout_output_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static ssize_t aout_output_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { … } static DEVICE_ATTR_RW(aout_output); static ssize_t alarm_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static SENSOR_DEVICE_ATTR_RO(in0_alarm, alarm, 0); static SENSOR_DEVICE_ATTR_RO(in1_alarm, alarm, 1); static SENSOR_DEVICE_ATTR_RO(in2_alarm, alarm, 2); static SENSOR_DEVICE_ATTR_RO(in3_alarm, alarm, 3); static SENSOR_DEVICE_ATTR_RO(in4_alarm, alarm, 8); static SENSOR_DEVICE_ATTR_RO(in5_alarm, alarm, 9); static SENSOR_DEVICE_ATTR_RO(in6_alarm, alarm, 6); static SENSOR_DEVICE_ATTR_RO(in7_alarm, alarm, 7); static SENSOR_DEVICE_ATTR_RO(temp1_alarm, alarm, 4); static SENSOR_DEVICE_ATTR_RO(temp2_alarm, alarm, 5); static SENSOR_DEVICE_ATTR_RO(temp3_alarm, alarm, 5); static SENSOR_DEVICE_ATTR_RO(fan1_alarm, alarm, 6); static SENSOR_DEVICE_ATTR_RO(fan2_alarm, alarm, 7); static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 14); static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 15); /* * Real code */ static struct attribute *lm87_attributes[] = …; static const struct attribute_group lm87_group = …; static struct attribute *lm87_attributes_in6[] = …; static const struct attribute_group lm87_group_in6 = …; static struct attribute *lm87_attributes_fan1[] = …; static const struct attribute_group lm87_group_fan1 = …; static struct attribute *lm87_attributes_in7[] = …; static const struct attribute_group lm87_group_in7 = …; static struct attribute *lm87_attributes_fan2[] = …; static const struct attribute_group lm87_group_fan2 = …; static struct attribute *lm87_attributes_temp3[] = …; static const struct attribute_group lm87_group_temp3 = …; static struct attribute *lm87_attributes_in0_5[] = …; static const struct attribute_group lm87_group_in0_5 = …; static struct attribute *lm87_attributes_vid[] = …; static const struct attribute_group lm87_group_vid = …; /* Return 0 if detection is successful, -ENODEV otherwise */ static int lm87_detect(struct i2c_client *client, struct i2c_board_info *info) { … } static void lm87_restore_config(void *arg) { … } static int lm87_init_client(struct i2c_client *client) { … } static int lm87_probe(struct i2c_client *client) { … } /* * Driver data (common to all clients) */ static const struct i2c_device_id lm87_id[] = …; MODULE_DEVICE_TABLE(i2c, lm87_id); static const struct of_device_id lm87_of_match[] = …; MODULE_DEVICE_TABLE(of, lm87_of_match); static struct i2c_driver lm87_driver = …; module_i2c_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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