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According to the March 2013 revision of the LM82 datasheet, the latest LM82 die revision is 0x03. This was confirmed and observed with a real chip. Further details in this revision of the LM82 datasheet suggest that LM82 is now just a repackaged LM83. Such versions of LM82 will be detected as LM83. Add comment to the code explaining why this may happen. Signed-off-by: Guenter Roeck <linux@roeck-us.net>
419 lines
11 KiB
C
419 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* lm83.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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* Heavily inspired from the lm78, lm75 and adm1021 drivers. The LM83 is
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* a sensor chip made by National Semiconductor. It reports up to four
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* temperatures (its own plus up to three external ones) with a 1 deg
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* resolution and a 3-4 deg accuracy. Complete datasheet can be obtained
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* from National's website at:
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* http://www.national.com/pf/LM/LM83.html
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* Since the datasheet omits to give the chip stepping code, I give it
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* here: 0x03 (at register 0xff).
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*
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* Also supports the LM82 temp sensor, which is basically a stripped down
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* model of the LM83. Datasheet is here:
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* http://www.national.com/pf/LM/LM82.html
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*/
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#include <linux/err.h>
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#include <linux/i2c.h>
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#include <linux/init.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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#include <linux/sysfs.h>
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/*
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* Addresses to scan
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* Address is selected using 2 three-level pins, resulting in 9 possible
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* addresses.
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*/
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static const unsigned short normal_i2c[] = {
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0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
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enum chips { lm83, lm82 };
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/*
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* The LM83 registers
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* Manufacturer ID is 0x01 for National Semiconductor.
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*/
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#define LM83_REG_R_MAN_ID 0xFE
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#define LM83_REG_R_CHIP_ID 0xFF
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#define LM83_REG_R_CONFIG 0x03
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#define LM83_REG_W_CONFIG 0x09
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#define LM83_REG_R_STATUS1 0x02
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#define LM83_REG_R_STATUS2 0x35
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#define LM83_REG_R_LOCAL_TEMP 0x00
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#define LM83_REG_R_LOCAL_HIGH 0x05
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#define LM83_REG_W_LOCAL_HIGH 0x0B
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#define LM83_REG_R_REMOTE1_TEMP 0x30
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#define LM83_REG_R_REMOTE1_HIGH 0x38
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#define LM83_REG_W_REMOTE1_HIGH 0x50
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#define LM83_REG_R_REMOTE2_TEMP 0x01
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#define LM83_REG_R_REMOTE2_HIGH 0x07
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#define LM83_REG_W_REMOTE2_HIGH 0x0D
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#define LM83_REG_R_REMOTE3_TEMP 0x31
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#define LM83_REG_R_REMOTE3_HIGH 0x3A
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#define LM83_REG_W_REMOTE3_HIGH 0x52
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#define LM83_REG_R_TCRIT 0x42
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#define LM83_REG_W_TCRIT 0x5A
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static const u8 LM83_REG_TEMP[] = {
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LM83_REG_R_LOCAL_TEMP,
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LM83_REG_R_REMOTE1_TEMP,
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LM83_REG_R_REMOTE2_TEMP,
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LM83_REG_R_REMOTE3_TEMP,
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LM83_REG_R_LOCAL_HIGH,
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LM83_REG_R_REMOTE1_HIGH,
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LM83_REG_R_REMOTE2_HIGH,
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LM83_REG_R_REMOTE3_HIGH,
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LM83_REG_R_TCRIT,
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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 lm83_data {
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struct regmap *regmap;
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const struct attribute_group *groups[3];
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};
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/* regmap code */
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static int lm83_regmap_reg_read(void *context, unsigned int reg, unsigned int *val)
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{
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struct i2c_client *client = context;
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int ret;
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ret = i2c_smbus_read_byte_data(client, reg);
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if (ret < 0)
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return ret;
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*val = ret;
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return 0;
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}
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/*
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* The regmap write function maps read register addresses to write register
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* addresses. This is necessary for regmap register caching to work.
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* An alternative would be to clear the regmap cache whenever a register is
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* written, but that would be much more expensive.
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*/
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static int lm83_regmap_reg_write(void *context, unsigned int reg, unsigned int val)
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{
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struct i2c_client *client = context;
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switch (reg) {
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case LM83_REG_R_CONFIG:
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case LM83_REG_R_LOCAL_HIGH:
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case LM83_REG_R_REMOTE2_HIGH:
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reg += 0x06;
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break;
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case LM83_REG_R_REMOTE1_HIGH:
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case LM83_REG_R_REMOTE3_HIGH:
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case LM83_REG_R_TCRIT:
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reg += 0x18;
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break;
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default:
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break;
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}
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return i2c_smbus_write_byte_data(client, reg, val);
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}
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static bool lm83_regmap_is_volatile(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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case LM83_REG_R_LOCAL_TEMP:
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case LM83_REG_R_REMOTE1_TEMP:
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case LM83_REG_R_REMOTE2_TEMP:
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case LM83_REG_R_REMOTE3_TEMP:
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case LM83_REG_R_STATUS1:
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case LM83_REG_R_STATUS2:
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return true;
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default:
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return false;
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}
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}
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static const struct regmap_config lm83_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.cache_type = REGCACHE_RBTREE,
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.volatile_reg = lm83_regmap_is_volatile,
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.reg_read = lm83_regmap_reg_read,
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.reg_write = lm83_regmap_reg_write,
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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 temp_show(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 lm83_data *data = dev_get_drvdata(dev);
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unsigned int regval;
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int ret;
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ret = regmap_read(data->regmap, LM83_REG_TEMP[attr->index], ®val);
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if (ret)
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return ret;
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return sprintf(buf, "%d\n", (s8)regval * 1000);
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}
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static ssize_t temp_store(struct device *dev,
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struct device_attribute *devattr, const char *buf,
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size_t count)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct lm83_data *data = dev_get_drvdata(dev);
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unsigned int regval;
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long val;
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int err;
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err = kstrtol(buf, 10, &val);
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if (err < 0)
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return err;
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regval = DIV_ROUND_CLOSEST(clamp_val(val, -128000, 127000), 1000);
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err = regmap_write(data->regmap, LM83_REG_TEMP[attr->index], regval);
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return err ? : count;
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}
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static ssize_t alarms_show(struct device *dev, struct device_attribute *dummy,
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char *buf)
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{
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struct lm83_data *data = dev_get_drvdata(dev);
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unsigned int alarms, regval;
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int err;
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err = regmap_read(data->regmap, LM83_REG_R_STATUS1, ®val);
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if (err < 0)
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return err;
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alarms = regval;
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err = regmap_read(data->regmap, LM83_REG_R_STATUS2, ®val);
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if (err < 0)
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return err;
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alarms |= regval << 8;
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return sprintf(buf, "%u\n", alarms);
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}
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static ssize_t alarm_show(struct device *dev,
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struct device_attribute *devattr, 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 lm83_data *data = dev_get_drvdata(dev);
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int bitnr = attr->index;
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unsigned int alarm;
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int reg, err;
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if (bitnr < 8) {
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reg = LM83_REG_R_STATUS1;
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} else {
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reg = LM83_REG_R_STATUS2;
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bitnr -= 8;
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}
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err = regmap_read(data->regmap, reg, &alarm);
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if (err < 0)
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return err;
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return sprintf(buf, "%d\n", (alarm >> bitnr) & 1);
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}
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static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0);
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static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1);
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static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 2);
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static SENSOR_DEVICE_ATTR_RO(temp4_input, temp, 3);
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static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, 4);
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static SENSOR_DEVICE_ATTR_RW(temp2_max, temp, 5);
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static SENSOR_DEVICE_ATTR_RW(temp3_max, temp, 6);
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static SENSOR_DEVICE_ATTR_RW(temp4_max, temp, 7);
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static SENSOR_DEVICE_ATTR_RO(temp1_crit, temp, 8);
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static SENSOR_DEVICE_ATTR_RO(temp2_crit, temp, 8);
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static SENSOR_DEVICE_ATTR_RW(temp3_crit, temp, 8);
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static SENSOR_DEVICE_ATTR_RO(temp4_crit, temp, 8);
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/* Individual alarm files */
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static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 0);
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static SENSOR_DEVICE_ATTR_RO(temp3_crit_alarm, alarm, 1);
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static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 2);
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static SENSOR_DEVICE_ATTR_RO(temp3_max_alarm, alarm, 4);
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static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 6);
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static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, 8);
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static SENSOR_DEVICE_ATTR_RO(temp4_crit_alarm, alarm, 9);
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static SENSOR_DEVICE_ATTR_RO(temp4_fault, alarm, 10);
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static SENSOR_DEVICE_ATTR_RO(temp4_max_alarm, alarm, 12);
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static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 13);
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static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 15);
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/* Raw alarm file for compatibility */
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static DEVICE_ATTR_RO(alarms);
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static struct attribute *lm83_attributes[] = {
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&sensor_dev_attr_temp1_input.dev_attr.attr,
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&sensor_dev_attr_temp3_input.dev_attr.attr,
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&sensor_dev_attr_temp1_max.dev_attr.attr,
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&sensor_dev_attr_temp3_max.dev_attr.attr,
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&sensor_dev_attr_temp1_crit.dev_attr.attr,
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&sensor_dev_attr_temp3_crit.dev_attr.attr,
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&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
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&sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
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&sensor_dev_attr_temp3_fault.dev_attr.attr,
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&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
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&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
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&dev_attr_alarms.attr,
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NULL
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};
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static const struct attribute_group lm83_group = {
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.attrs = lm83_attributes,
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};
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static struct attribute *lm83_attributes_opt[] = {
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&sensor_dev_attr_temp2_input.dev_attr.attr,
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&sensor_dev_attr_temp4_input.dev_attr.attr,
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&sensor_dev_attr_temp2_max.dev_attr.attr,
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&sensor_dev_attr_temp4_max.dev_attr.attr,
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&sensor_dev_attr_temp2_crit.dev_attr.attr,
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&sensor_dev_attr_temp4_crit.dev_attr.attr,
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&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
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&sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
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&sensor_dev_attr_temp4_fault.dev_attr.attr,
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&sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
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&sensor_dev_attr_temp2_fault.dev_attr.attr,
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&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
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NULL
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};
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static const struct attribute_group lm83_group_opt = {
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.attrs = lm83_attributes_opt,
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};
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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 lm83_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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const char *name;
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u8 man_id, 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 ((i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS1) & 0xA8) ||
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(i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS2) & 0x48) ||
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(i2c_smbus_read_byte_data(client, LM83_REG_R_CONFIG) & 0x41)) {
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dev_dbg(&adapter->dev, "LM83 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 = i2c_smbus_read_byte_data(client, LM83_REG_R_MAN_ID);
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if (man_id != 0x01) /* National Semiconductor */
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return -ENODEV;
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chip_id = i2c_smbus_read_byte_data(client, LM83_REG_R_CHIP_ID);
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switch (chip_id) {
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case 0x03:
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/*
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* According to the LM82 datasheet dated March 2013, recent
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* revisions of LM82 have a die revision of 0x03. This was
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* confirmed with a real chip. Further details in this revision
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* of the LM82 datasheet strongly suggest that LM82 is just a
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* repackaged LM83. It is therefore impossible to distinguish
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* those chips from LM83, and they will be misdetected as LM83.
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*/
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name = "lm83";
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break;
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case 0x01:
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name = "lm82";
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break;
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default:
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/* identification failed */
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dev_dbg(&adapter->dev,
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"Unsupported chip (man_id=0x%02X, 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, name, I2C_NAME_SIZE);
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return 0;
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}
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static const struct i2c_device_id lm83_id[] = {
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{ "lm83", lm83 },
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{ "lm82", lm82 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, lm83_id);
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static int lm83_probe(struct i2c_client *client)
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{
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struct device *dev = &client->dev;
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struct device *hwmon_dev;
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struct lm83_data *data;
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data = devm_kzalloc(dev, sizeof(struct lm83_data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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data->regmap = devm_regmap_init(dev, NULL, client, &lm83_regmap_config);
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if (IS_ERR(data->regmap))
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return PTR_ERR(data->regmap);
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/*
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* Register sysfs hooks
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* The LM82 can only monitor one external diode which is
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* at the same register as the LM83 temp3 entry - so we
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* declare 1 and 3 common, and then 2 and 4 only for the LM83.
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*/
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data->groups[0] = &lm83_group;
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if (i2c_match_id(lm83_id, client)->driver_data == lm83)
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data->groups[1] = &lm83_group_opt;
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hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
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data, data->groups);
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return PTR_ERR_OR_ZERO(hwmon_dev);
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}
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/*
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* Driver data (common to all clients)
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*/
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static struct i2c_driver lm83_driver = {
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.class = I2C_CLASS_HWMON,
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.driver = {
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.name = "lm83",
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},
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.probe_new = lm83_probe,
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.id_table = lm83_id,
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.detect = lm83_detect,
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.address_list = normal_i2c,
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};
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module_i2c_driver(lm83_driver);
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MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
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MODULE_DESCRIPTION("LM83 driver");
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MODULE_LICENSE("GPL");
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