| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * max1619.c - Part of lm_sensors, Linux kernel modules for hardware |
| * monitoring |
| * Copyright (C) 2003-2004 Oleksij Rempel <bug-track@fisher-privat.net> |
| * Jean Delvare <jdelvare@suse.de> |
| * |
| * Based on the lm90 driver. The MAX1619 is a sensor chip made by Maxim. |
| * It reports up to two temperatures (its own plus up to |
| * one external one). Complete datasheet can be |
| * obtained from Maxim's website at: |
| * http://pdfserv.maxim-ic.com/en/ds/MAX1619.pdf |
| */ |
| |
| #include <linux/err.h> |
| #include <linux/hwmon.h> |
| #include <linux/i2c.h> |
| #include <linux/init.h> |
| #include <linux/module.h> |
| #include <linux/regmap.h> |
| #include <linux/util_macros.h> |
| |
| static const unsigned short normal_i2c[] = { |
| 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END }; |
| |
| #define MAX1619_REG_LOCAL_TEMP 0x00 |
| #define MAX1619_REG_REMOTE_TEMP 0x01 |
| #define MAX1619_REG_STATUS 0x02 |
| #define MAX1619_REG_CONFIG 0x03 |
| #define MAX1619_REG_CONVRATE 0x04 |
| #define MAX1619_REG_REMOTE_HIGH 0x07 |
| #define MAX1619_REG_REMOTE_LOW 0x08 |
| #define MAX1619_REG_REMOTE_CRIT 0x10 |
| #define MAX1619_REG_REMOTE_CRIT_HYST 0x11 |
| #define MAX1619_REG_MAN_ID 0xFE |
| #define MAX1619_REG_CHIP_ID 0xFF |
| |
| static int get_alarms(struct regmap *regmap) |
| { |
| static u32 regs[2] = { MAX1619_REG_STATUS, MAX1619_REG_CONFIG }; |
| u8 regdata[2]; |
| int ret; |
| |
| ret = regmap_multi_reg_read(regmap, regs, regdata, 2); |
| if (ret) |
| return ret; |
| |
| /* OVERT status bit may be reversed */ |
| if (!(regdata[1] & 0x20)) |
| regdata[0] ^= 0x02; |
| |
| return regdata[0] & 0x1e; |
| } |
| |
| static int max1619_temp_read(struct regmap *regmap, u32 attr, int channel, long *val) |
| { |
| int reg = -1, alarm_bit = 0; |
| u32 temp; |
| int ret; |
| |
| switch (attr) { |
| case hwmon_temp_input: |
| reg = channel ? MAX1619_REG_REMOTE_TEMP : MAX1619_REG_LOCAL_TEMP; |
| break; |
| case hwmon_temp_min: |
| reg = MAX1619_REG_REMOTE_LOW; |
| break; |
| case hwmon_temp_max: |
| reg = MAX1619_REG_REMOTE_HIGH; |
| break; |
| case hwmon_temp_crit: |
| reg = MAX1619_REG_REMOTE_CRIT; |
| break; |
| case hwmon_temp_crit_hyst: |
| reg = MAX1619_REG_REMOTE_CRIT_HYST; |
| break; |
| case hwmon_temp_min_alarm: |
| alarm_bit = 3; |
| break; |
| case hwmon_temp_max_alarm: |
| alarm_bit = 4; |
| break; |
| case hwmon_temp_crit_alarm: |
| alarm_bit = 1; |
| break; |
| case hwmon_temp_fault: |
| alarm_bit = 2; |
| break; |
| default: |
| return -EOPNOTSUPP; |
| } |
| if (reg >= 0) { |
| ret = regmap_read(regmap, reg, &temp); |
| if (ret < 0) |
| return ret; |
| *val = sign_extend32(temp, 7) * 1000; |
| } else { |
| ret = get_alarms(regmap); |
| if (ret < 0) |
| return ret; |
| *val = !!(ret & BIT(alarm_bit)); |
| } |
| return 0; |
| } |
| |
| static u16 update_intervals[] = { 16000, 8000, 4000, 2000, 1000, 500, 250, 125 }; |
| |
| static int max1619_chip_read(struct regmap *regmap, u32 attr, long *val) |
| { |
| int alarms, ret; |
| u32 regval; |
| |
| switch (attr) { |
| case hwmon_chip_update_interval: |
| ret = regmap_read(regmap, MAX1619_REG_CONVRATE, ®val); |
| if (ret < 0) |
| return ret; |
| *val = update_intervals[regval & 7]; |
| break; |
| case hwmon_chip_alarms: |
| alarms = get_alarms(regmap); |
| if (alarms < 0) |
| return alarms; |
| *val = alarms; |
| break; |
| default: |
| return -EOPNOTSUPP; |
| } |
| return 0; |
| } |
| |
| static int max1619_read(struct device *dev, enum hwmon_sensor_types type, |
| u32 attr, int channel, long *val) |
| { |
| struct regmap *regmap = dev_get_drvdata(dev); |
| |
| switch (type) { |
| case hwmon_chip: |
| return max1619_chip_read(regmap, attr, val); |
| case hwmon_temp: |
| return max1619_temp_read(regmap, attr, channel, val); |
| default: |
| return -EOPNOTSUPP; |
| } |
| } |
| |
| static int max1619_chip_write(struct regmap *regmap, u32 attr, long val) |
| { |
| switch (attr) { |
| case hwmon_chip_update_interval: |
| val = find_closest_descending(val, update_intervals, ARRAY_SIZE(update_intervals)); |
| return regmap_write(regmap, MAX1619_REG_CONVRATE, val); |
| default: |
| return -EOPNOTSUPP; |
| } |
| } |
| |
| static int max1619_temp_write(struct regmap *regmap, |
| u32 attr, int channel, long val) |
| { |
| int reg; |
| |
| switch (attr) { |
| case hwmon_temp_min: |
| reg = MAX1619_REG_REMOTE_LOW; |
| break; |
| case hwmon_temp_max: |
| reg = MAX1619_REG_REMOTE_HIGH; |
| break; |
| case hwmon_temp_crit: |
| reg = MAX1619_REG_REMOTE_CRIT; |
| break; |
| case hwmon_temp_crit_hyst: |
| reg = MAX1619_REG_REMOTE_CRIT_HYST; |
| break; |
| default: |
| return -EOPNOTSUPP; |
| } |
| val = DIV_ROUND_CLOSEST(clamp_val(val, -128000, 127000), 1000); |
| return regmap_write(regmap, reg, val); |
| } |
| |
| static int max1619_write(struct device *dev, enum hwmon_sensor_types type, |
| u32 attr, int channel, long val) |
| { |
| struct regmap *regmap = dev_get_drvdata(dev); |
| |
| switch (type) { |
| case hwmon_chip: |
| return max1619_chip_write(regmap, attr, val); |
| case hwmon_temp: |
| return max1619_temp_write(regmap, attr, channel, val); |
| default: |
| return -EOPNOTSUPP; |
| } |
| } |
| |
| static umode_t max1619_is_visible(const void *_data, enum hwmon_sensor_types type, |
| u32 attr, int channel) |
| { |
| switch (type) { |
| case hwmon_chip: |
| switch (attr) { |
| case hwmon_chip_update_interval: |
| return 0644; |
| case hwmon_chip_alarms: |
| return 0444; |
| default: |
| break; |
| } |
| break; |
| case hwmon_temp: |
| switch (attr) { |
| case hwmon_temp_input: |
| return 0444; |
| case hwmon_temp_min: |
| case hwmon_temp_max: |
| case hwmon_temp_crit: |
| case hwmon_temp_crit_hyst: |
| return 0644; |
| case hwmon_temp_min_alarm: |
| case hwmon_temp_max_alarm: |
| case hwmon_temp_crit_alarm: |
| case hwmon_temp_fault: |
| return 0444; |
| default: |
| break; |
| } |
| break; |
| default: |
| break; |
| } |
| return 0; |
| } |
| |
| static const struct hwmon_channel_info * const max1619_info[] = { |
| HWMON_CHANNEL_INFO(chip, HWMON_C_ALARMS | HWMON_C_UPDATE_INTERVAL), |
| HWMON_CHANNEL_INFO(temp, |
| HWMON_T_INPUT, |
| HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX | |
| HWMON_T_CRIT | HWMON_T_CRIT_HYST | |
| HWMON_T_MIN_ALARM | HWMON_T_MAX_ALARM | |
| HWMON_T_CRIT_ALARM | HWMON_T_FAULT), |
| NULL |
| }; |
| |
| static const struct hwmon_ops max1619_hwmon_ops = { |
| .is_visible = max1619_is_visible, |
| .read = max1619_read, |
| .write = max1619_write, |
| }; |
| |
| static const struct hwmon_chip_info max1619_chip_info = { |
| .ops = &max1619_hwmon_ops, |
| .info = max1619_info, |
| }; |
| |
| /* Return 0 if detection is successful, -ENODEV otherwise */ |
| static int max1619_detect(struct i2c_client *client, |
| struct i2c_board_info *info) |
| { |
| struct i2c_adapter *adapter = client->adapter; |
| int regval; |
| |
| if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) |
| return -ENODEV; |
| |
| regval = i2c_smbus_read_byte_data(client, MAX1619_REG_CONFIG); |
| if (regval < 0 || (regval & 0x03)) |
| return -ENODEV; |
| regval = i2c_smbus_read_byte_data(client, MAX1619_REG_CONVRATE); |
| if (regval < 0 || regval > 0x07) |
| return -ENODEV; |
| regval = i2c_smbus_read_byte_data(client, MAX1619_REG_STATUS); |
| if (regval < 0 || (regval & 0x61)) |
| return -ENODEV; |
| |
| regval = i2c_smbus_read_byte_data(client, MAX1619_REG_MAN_ID); |
| if (regval != 0x4d) |
| return -ENODEV; |
| regval = i2c_smbus_read_byte_data(client, MAX1619_REG_CHIP_ID); |
| if (regval != 0x04) |
| return -ENODEV; |
| |
| strscpy(info->type, "max1619", I2C_NAME_SIZE); |
| |
| return 0; |
| } |
| |
| static int max1619_init_chip(struct regmap *regmap) |
| { |
| int ret; |
| |
| ret = regmap_write(regmap, MAX1619_REG_CONVRATE, 5); /* 2 Hz */ |
| if (ret) |
| return ret; |
| |
| /* Start conversions */ |
| return regmap_clear_bits(regmap, MAX1619_REG_CONFIG, 0x40); |
| } |
| |
| /* regmap */ |
| |
| static int max1619_reg_read(void *context, unsigned int reg, unsigned int *val) |
| { |
| int ret; |
| |
| ret = i2c_smbus_read_byte_data(context, reg); |
| if (ret < 0) |
| return ret; |
| |
| *val = ret; |
| return 0; |
| } |
| |
| static int max1619_reg_write(void *context, unsigned int reg, unsigned int val) |
| { |
| int offset = reg < MAX1619_REG_REMOTE_CRIT ? 6 : 2; |
| |
| return i2c_smbus_write_byte_data(context, reg + offset, val); |
| } |
| |
| static bool max1619_regmap_is_volatile(struct device *dev, unsigned int reg) |
| { |
| return reg <= MAX1619_REG_STATUS; |
| } |
| |
| static bool max1619_regmap_is_writeable(struct device *dev, unsigned int reg) |
| { |
| return reg > MAX1619_REG_STATUS && reg <= MAX1619_REG_REMOTE_CRIT_HYST; |
| } |
| |
| static const struct regmap_config max1619_regmap_config = { |
| .reg_bits = 8, |
| .val_bits = 8, |
| .max_register = MAX1619_REG_REMOTE_CRIT_HYST, |
| .cache_type = REGCACHE_MAPLE, |
| .volatile_reg = max1619_regmap_is_volatile, |
| .writeable_reg = max1619_regmap_is_writeable, |
| }; |
| |
| static const struct regmap_bus max1619_regmap_bus = { |
| .reg_write = max1619_reg_write, |
| .reg_read = max1619_reg_read, |
| }; |
| |
| static int max1619_probe(struct i2c_client *client) |
| { |
| struct device *dev = &client->dev; |
| struct device *hwmon_dev; |
| struct regmap *regmap; |
| int ret; |
| |
| regmap = devm_regmap_init(dev, &max1619_regmap_bus, client, |
| &max1619_regmap_config); |
| if (IS_ERR(regmap)) |
| return PTR_ERR(regmap); |
| |
| ret = max1619_init_chip(regmap); |
| if (ret) |
| return ret; |
| |
| hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, |
| regmap, &max1619_chip_info, NULL); |
| return PTR_ERR_OR_ZERO(hwmon_dev); |
| } |
| |
| static const struct i2c_device_id max1619_id[] = { |
| { "max1619" }, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(i2c, max1619_id); |
| |
| #ifdef CONFIG_OF |
| static const struct of_device_id max1619_of_match[] = { |
| { .compatible = "maxim,max1619", }, |
| {}, |
| }; |
| |
| MODULE_DEVICE_TABLE(of, max1619_of_match); |
| #endif |
| |
| static struct i2c_driver max1619_driver = { |
| .class = I2C_CLASS_HWMON, |
| .driver = { |
| .name = "max1619", |
| .of_match_table = of_match_ptr(max1619_of_match), |
| }, |
| .probe = max1619_probe, |
| .id_table = max1619_id, |
| .detect = max1619_detect, |
| .address_list = normal_i2c, |
| }; |
| |
| module_i2c_driver(max1619_driver); |
| |
| MODULE_AUTHOR("Oleksij Rempel <bug-track@fisher-privat.net>, Jean Delvare <jdelvare@suse.de>"); |
| MODULE_DESCRIPTION("MAX1619 sensor driver"); |
| MODULE_LICENSE("GPL"); |