| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Roland Stigge | 2043 | 69.21% | 2 | 8.70% |
| Naresh Solanki | 512 | 17.34% | 2 | 8.70% |
| Marcello Sylvester Bauer | 186 | 6.30% | 1 | 4.35% |
| Guenter Roeck | 156 | 5.28% | 5 | 21.74% |
| Mark Brown | 16 | 0.54% | 1 | 4.35% |
| Chris D Schimp | 15 | 0.51% | 2 | 8.70% |
| Jingoo Han | 9 | 0.30% | 2 | 8.70% |
| Frans Meulenbroeks | 4 | 0.14% | 1 | 4.35% |
| Jonathan Cameron | 4 | 0.14% | 1 | 4.35% |
| Thomas Gleixner | 2 | 0.07% | 1 | 4.35% |
| Wolfram Sang | 2 | 0.07% | 2 | 8.70% |
| Axel Lin | 2 | 0.07% | 2 | 8.70% |
| Uwe Kleine-König | 1 | 0.03% | 1 | 4.35% |
| Total | 2952 | 23 |
// SPDX-License-Identifier: GPL-2.0-or-later /* * max6639.c - Support for Maxim MAX6639 * * 2-Channel Temperature Monitor with Dual PWM Fan-Speed Controller * * Copyright (C) 2010, 2011 Roland Stigge <stigge@antcom.de> * * based on the initial MAX6639 support from semptian.net * by He Changqing <hechangqing@semptian.com> */ #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/err.h> #include <linux/mutex.h> #include <linux/platform_data/max6639.h> #include <linux/regmap.h> /* Addresses to scan */ static const unsigned short normal_i2c[] = { 0x2c, 0x2e, 0x2f, I2C_CLIENT_END }; /* The MAX6639 registers, valid channel numbers: 0, 1 */ #define MAX6639_REG_TEMP(ch) (0x00 + (ch)) #define MAX6639_REG_STATUS 0x02 #define MAX6639_REG_OUTPUT_MASK 0x03 #define MAX6639_REG_GCONFIG 0x04 #define MAX6639_REG_TEMP_EXT(ch) (0x05 + (ch)) #define MAX6639_REG_ALERT_LIMIT(ch) (0x08 + (ch)) #define MAX6639_REG_OT_LIMIT(ch) (0x0A + (ch)) #define MAX6639_REG_THERM_LIMIT(ch) (0x0C + (ch)) #define MAX6639_REG_FAN_CONFIG1(ch) (0x10 + (ch) * 4) #define MAX6639_REG_FAN_CONFIG2a(ch) (0x11 + (ch) * 4) #define MAX6639_REG_FAN_CONFIG2b(ch) (0x12 + (ch) * 4) #define MAX6639_REG_FAN_CONFIG3(ch) (0x13 + (ch) * 4) #define MAX6639_REG_FAN_CNT(ch) (0x20 + (ch)) #define MAX6639_REG_TARGET_CNT(ch) (0x22 + (ch)) #define MAX6639_REG_FAN_PPR(ch) (0x24 + (ch)) #define MAX6639_REG_TARGTDUTY(ch) (0x26 + (ch)) #define MAX6639_REG_FAN_START_TEMP(ch) (0x28 + (ch)) #define MAX6639_REG_DEVID 0x3D #define MAX6639_REG_MANUID 0x3E #define MAX6639_REG_DEVREV 0x3F /* Register bits */ #define MAX6639_GCONFIG_STANDBY 0x80 #define MAX6639_GCONFIG_POR 0x40 #define MAX6639_GCONFIG_DISABLE_TIMEOUT 0x20 #define MAX6639_GCONFIG_CH2_LOCAL 0x10 #define MAX6639_GCONFIG_PWM_FREQ_HI 0x08 #define MAX6639_FAN_CONFIG1_PWM 0x80 #define MAX6639_FAN_CONFIG3_THERM_FULL_SPEED 0x40 #define MAX6639_NUM_CHANNELS 2 static const int rpm_ranges[] = { 2000, 4000, 8000, 16000 }; #define FAN_FROM_REG(val, rpm_range) ((val) == 0 || (val) == 255 ? \ 0 : (rpm_ranges[rpm_range] * 30) / (val)) #define TEMP_LIMIT_TO_REG(val) clamp_val((val) / 1000, 0, 255) /* * Client data (each client gets its own) */ struct max6639_data { struct regmap *regmap; /* Register values initialized only once */ u8 ppr; /* Pulses per rotation 0..3 for 1..4 ppr */ u8 rpm_range; /* Index in above rpm_ranges table */ /* Optional regulator for FAN supply */ struct regulator *reg; }; static ssize_t temp_input_show(struct device *dev, struct device_attribute *dev_attr, char *buf) { long temp; struct max6639_data *data = dev_get_drvdata(dev); struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); unsigned int val; int res; /* * Lock isn't needed as MAX6639_REG_TEMP wpnt change for at least 250ms after reading * MAX6639_REG_TEMP_EXT */ res = regmap_read(data->regmap, MAX6639_REG_TEMP_EXT(attr->index), &val); if (res < 0) return res; temp = val >> 5; res = regmap_read(data->regmap, MAX6639_REG_TEMP(attr->index), &val); if (res < 0) return res; temp |= val << 3; temp *= 125; return sprintf(buf, "%ld\n", temp); } static ssize_t temp_fault_show(struct device *dev, struct device_attribute *dev_attr, char *buf) { struct max6639_data *data = dev_get_drvdata(dev); struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); unsigned int val; int res; res = regmap_read(data->regmap, MAX6639_REG_TEMP_EXT(attr->index), &val); if (res < 0) return res; return sprintf(buf, "%d\n", val & 1); } static ssize_t temp_max_show(struct device *dev, struct device_attribute *dev_attr, char *buf) { struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); struct max6639_data *data = dev_get_drvdata(dev); unsigned int val; int res; res = regmap_read(data->regmap, MAX6639_REG_THERM_LIMIT(attr->index), &val); if (res < 0) return res; return sprintf(buf, "%d\n", (val * 1000)); } static ssize_t temp_max_store(struct device *dev, struct device_attribute *dev_attr, const char *buf, size_t count) { struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); struct max6639_data *data = dev_get_drvdata(dev); unsigned long val; int res; res = kstrtoul(buf, 10, &val); if (res) return res; regmap_write(data->regmap, MAX6639_REG_THERM_LIMIT(attr->index), TEMP_LIMIT_TO_REG(val)); return count; } static ssize_t temp_crit_show(struct device *dev, struct device_attribute *dev_attr, char *buf) { struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); struct max6639_data *data = dev_get_drvdata(dev); unsigned int val; int res; res = regmap_read(data->regmap, MAX6639_REG_ALERT_LIMIT(attr->index), &val); if (res < 0) return res; return sprintf(buf, "%d\n", (val * 1000)); } static ssize_t temp_crit_store(struct device *dev, struct device_attribute *dev_attr, const char *buf, size_t count) { struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); struct max6639_data *data = dev_get_drvdata(dev); unsigned long val; int res; res = kstrtoul(buf, 10, &val); if (res) return res; regmap_write(data->regmap, MAX6639_REG_ALERT_LIMIT(attr->index), TEMP_LIMIT_TO_REG(val)); return count; } static ssize_t temp_emergency_show(struct device *dev, struct device_attribute *dev_attr, char *buf) { struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); struct max6639_data *data = dev_get_drvdata(dev); unsigned int val; int res; res = regmap_read(data->regmap, MAX6639_REG_OT_LIMIT(attr->index), &val); if (res < 0) return res; return sprintf(buf, "%d\n", (val * 1000)); } static ssize_t temp_emergency_store(struct device *dev, struct device_attribute *dev_attr, const char *buf, size_t count) { struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); struct max6639_data *data = dev_get_drvdata(dev); unsigned long val; int res; res = kstrtoul(buf, 10, &val); if (res) return res; regmap_write(data->regmap, MAX6639_REG_OT_LIMIT(attr->index), TEMP_LIMIT_TO_REG(val)); return count; } static ssize_t pwm_show(struct device *dev, struct device_attribute *dev_attr, char *buf) { struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); struct max6639_data *data = dev_get_drvdata(dev); unsigned int val; int res; res = regmap_read(data->regmap, MAX6639_REG_TARGTDUTY(attr->index), &val); if (res < 0) return res; return sprintf(buf, "%d\n", val * 255 / 120); } static ssize_t pwm_store(struct device *dev, struct device_attribute *dev_attr, const char *buf, size_t count) { struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); struct max6639_data *data = dev_get_drvdata(dev); unsigned long val; int res; res = kstrtoul(buf, 10, &val); if (res) return res; val = clamp_val(val, 0, 255); regmap_write(data->regmap, MAX6639_REG_TARGTDUTY(attr->index), val * 120 / 255); return count; } static ssize_t fan_input_show(struct device *dev, struct device_attribute *dev_attr, char *buf) { struct max6639_data *data = dev_get_drvdata(dev); struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); unsigned int val; int res; res = regmap_read(data->regmap, MAX6639_REG_FAN_CNT(attr->index), &val); if (res < 0) return res; return sprintf(buf, "%d\n", FAN_FROM_REG(val, data->rpm_range)); } static ssize_t alarm_show(struct device *dev, struct device_attribute *dev_attr, char *buf) { struct max6639_data *data = dev_get_drvdata(dev); struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); unsigned int val; int res; res = regmap_read(data->regmap, MAX6639_REG_STATUS, &val); if (res < 0) return res; return sprintf(buf, "%d\n", !!(val & (1 << attr->index))); } static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0); static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_input, 1); static SENSOR_DEVICE_ATTR_RO(temp1_fault, temp_fault, 0); static SENSOR_DEVICE_ATTR_RO(temp2_fault, temp_fault, 1); static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_max, 0); static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_max, 1); static SENSOR_DEVICE_ATTR_RW(temp1_crit, temp_crit, 0); static SENSOR_DEVICE_ATTR_RW(temp2_crit, temp_crit, 1); static SENSOR_DEVICE_ATTR_RW(temp1_emergency, temp_emergency, 0); static SENSOR_DEVICE_ATTR_RW(temp2_emergency, temp_emergency, 1); static SENSOR_DEVICE_ATTR_RW(pwm1, pwm, 0); static SENSOR_DEVICE_ATTR_RW(pwm2, pwm, 1); static SENSOR_DEVICE_ATTR_RO(fan1_input, fan_input, 0); static SENSOR_DEVICE_ATTR_RO(fan2_input, fan_input, 1); static SENSOR_DEVICE_ATTR_RO(fan1_fault, alarm, 1); static SENSOR_DEVICE_ATTR_RO(fan2_fault, alarm, 0); static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 3); static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 2); static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 7); static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, 6); static SENSOR_DEVICE_ATTR_RO(temp1_emergency_alarm, alarm, 5); static SENSOR_DEVICE_ATTR_RO(temp2_emergency_alarm, alarm, 4); static struct attribute *max6639_attrs[] = { &sensor_dev_attr_temp1_input.dev_attr.attr, &sensor_dev_attr_temp2_input.dev_attr.attr, &sensor_dev_attr_temp1_fault.dev_attr.attr, &sensor_dev_attr_temp2_fault.dev_attr.attr, &sensor_dev_attr_temp1_max.dev_attr.attr, &sensor_dev_attr_temp2_max.dev_attr.attr, &sensor_dev_attr_temp1_crit.dev_attr.attr, &sensor_dev_attr_temp2_crit.dev_attr.attr, &sensor_dev_attr_temp1_emergency.dev_attr.attr, &sensor_dev_attr_temp2_emergency.dev_attr.attr, &sensor_dev_attr_pwm1.dev_attr.attr, &sensor_dev_attr_pwm2.dev_attr.attr, &sensor_dev_attr_fan1_input.dev_attr.attr, &sensor_dev_attr_fan2_input.dev_attr.attr, &sensor_dev_attr_fan1_fault.dev_attr.attr, &sensor_dev_attr_fan2_fault.dev_attr.attr, &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr, &sensor_dev_attr_temp1_emergency_alarm.dev_attr.attr, &sensor_dev_attr_temp2_emergency_alarm.dev_attr.attr, NULL }; ATTRIBUTE_GROUPS(max6639); /* * returns respective index in rpm_ranges table * 1 by default on invalid range */ static int rpm_range_to_reg(int range) { int i; for (i = 0; i < ARRAY_SIZE(rpm_ranges); i++) { if (rpm_ranges[i] == range) return i; } return 1; /* default: 4000 RPM */ } static int max6639_set_ppr(struct max6639_data *data, u8 channel, u8 ppr) { return regmap_write(data->regmap, MAX6639_REG_FAN_PPR(channel), ppr << 6); } static int max6639_init_client(struct i2c_client *client, struct max6639_data *data) { struct max6639_platform_data *max6639_info = dev_get_platdata(&client->dev); int i; int rpm_range = 1; /* default: 4000 RPM */ int err, ppr; /* Reset chip to default values, see below for GCONFIG setup */ err = regmap_write(data->regmap, MAX6639_REG_GCONFIG, MAX6639_GCONFIG_POR); if (err) return err; /* Fans pulse per revolution is 2 by default */ if (max6639_info && max6639_info->ppr > 0 && max6639_info->ppr < 5) ppr = max6639_info->ppr; else ppr = 2; ppr -= 1; if (max6639_info) rpm_range = rpm_range_to_reg(max6639_info->rpm_range); data->rpm_range = rpm_range; for (i = 0; i < MAX6639_NUM_CHANNELS; i++) { /* Set Fan pulse per revolution */ err = max6639_set_ppr(data, i, ppr); if (err) return err; /* Fans config PWM, RPM */ err = regmap_write(data->regmap, MAX6639_REG_FAN_CONFIG1(i), MAX6639_FAN_CONFIG1_PWM | rpm_range); if (err) return err; /* Fans PWM polarity high by default */ if (max6639_info && max6639_info->pwm_polarity == 0) err = regmap_write(data->regmap, MAX6639_REG_FAN_CONFIG2a(i), 0x00); else err = regmap_write(data->regmap, MAX6639_REG_FAN_CONFIG2a(i), 0x02); if (err) return err; /* * /THERM full speed enable, * PWM frequency 25kHz, see also GCONFIG below */ err = regmap_write(data->regmap, MAX6639_REG_FAN_CONFIG3(i), MAX6639_FAN_CONFIG3_THERM_FULL_SPEED | 0x03); if (err) return err; /* Max. temp. 80C/90C/100C */ err = regmap_write(data->regmap, MAX6639_REG_THERM_LIMIT(i), 80); if (err) return err; err = regmap_write(data->regmap, MAX6639_REG_ALERT_LIMIT(i), 90); if (err) return err; err = regmap_write(data->regmap, MAX6639_REG_OT_LIMIT(i), 100); if (err) return err; /* PWM 120/120 (i.e. 100%) */ err = regmap_write(data->regmap, MAX6639_REG_TARGTDUTY(i), 120); if (err) return err; } /* Start monitoring */ return regmap_write(data->regmap, MAX6639_REG_GCONFIG, MAX6639_GCONFIG_DISABLE_TIMEOUT | MAX6639_GCONFIG_CH2_LOCAL | MAX6639_GCONFIG_PWM_FREQ_HI); } /* Return 0 if detection is successful, -ENODEV otherwise */ static int max6639_detect(struct i2c_client *client, struct i2c_board_info *info) { struct i2c_adapter *adapter = client->adapter; int dev_id, manu_id; if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) return -ENODEV; /* Actual detection via device and manufacturer ID */ dev_id = i2c_smbus_read_byte_data(client, MAX6639_REG_DEVID); manu_id = i2c_smbus_read_byte_data(client, MAX6639_REG_MANUID); if (dev_id != 0x58 || manu_id != 0x4D) return -ENODEV; strscpy(info->type, "max6639", I2C_NAME_SIZE); return 0; } static void max6639_regulator_disable(void *data) { regulator_disable(data); } static bool max6639_regmap_is_volatile(struct device *dev, unsigned int reg) { switch (reg) { case MAX6639_REG_TEMP(0): case MAX6639_REG_TEMP_EXT(0): case MAX6639_REG_TEMP(1): case MAX6639_REG_TEMP_EXT(1): case MAX6639_REG_STATUS: case MAX6639_REG_FAN_CNT(0): case MAX6639_REG_FAN_CNT(1): case MAX6639_REG_TARGTDUTY(0): case MAX6639_REG_TARGTDUTY(1): return true; default: return false; } } static const struct regmap_config max6639_regmap_config = { .reg_bits = 8, .val_bits = 8, .max_register = MAX6639_REG_DEVREV, .cache_type = REGCACHE_MAPLE, .volatile_reg = max6639_regmap_is_volatile, }; static int max6639_probe(struct i2c_client *client) { struct device *dev = &client->dev; struct max6639_data *data; struct device *hwmon_dev; int err; data = devm_kzalloc(dev, sizeof(struct max6639_data), GFP_KERNEL); if (!data) return -ENOMEM; data->regmap = devm_regmap_init_i2c(client, &max6639_regmap_config); if (IS_ERR(data->regmap)) return dev_err_probe(dev, PTR_ERR(data->regmap), "regmap initialization failed\n"); data->reg = devm_regulator_get_optional(dev, "fan"); if (IS_ERR(data->reg)) { if (PTR_ERR(data->reg) != -ENODEV) return PTR_ERR(data->reg); data->reg = NULL; } else { /* Spin up fans */ err = regulator_enable(data->reg); if (err) { dev_err(dev, "Failed to enable fan supply: %d\n", err); return err; } err = devm_add_action_or_reset(dev, max6639_regulator_disable, data->reg); if (err) { dev_err(dev, "Failed to register action: %d\n", err); return err; } } /* Initialize the max6639 chip */ err = max6639_init_client(client, data); if (err < 0) return err; hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, data, max6639_groups); return PTR_ERR_OR_ZERO(hwmon_dev); } static int max6639_suspend(struct device *dev) { struct max6639_data *data = dev_get_drvdata(dev); if (data->reg) regulator_disable(data->reg); return regmap_write_bits(data->regmap, MAX6639_REG_GCONFIG, MAX6639_GCONFIG_STANDBY, MAX6639_GCONFIG_STANDBY); } static int max6639_resume(struct device *dev) { struct max6639_data *data = dev_get_drvdata(dev); int ret; if (data->reg) { ret = regulator_enable(data->reg); if (ret) { dev_err(dev, "Failed to enable fan supply: %d\n", ret); return ret; } } return regmap_write_bits(data->regmap, MAX6639_REG_GCONFIG, MAX6639_GCONFIG_STANDBY, ~MAX6639_GCONFIG_STANDBY); } static const struct i2c_device_id max6639_id[] = { {"max6639"}, { } }; MODULE_DEVICE_TABLE(i2c, max6639_id); static DEFINE_SIMPLE_DEV_PM_OPS(max6639_pm_ops, max6639_suspend, max6639_resume); static const struct of_device_id max6639_of_match[] = { { .compatible = "maxim,max6639", }, { }, }; static struct i2c_driver max6639_driver = { .class = I2C_CLASS_HWMON, .driver = { .name = "max6639", .pm = pm_sleep_ptr(&max6639_pm_ops), .of_match_table = max6639_of_match, }, .probe = max6639_probe, .id_table = max6639_id, .detect = max6639_detect, .address_list = normal_i2c, }; module_i2c_driver(max6639_driver); MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>"); MODULE_DESCRIPTION("max6639 driver"); MODULE_LICENSE("GPL");
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