/* * max6639.c - Support for Maxim MAX6639 * * 2-Channel Temperature Monitor with Dual PWM Fan-Speed Controller * * Copyright (C) 2010, 2011 Roland Stigge * * based on the initial MAX6639 support from semptian.net * by He Changqing * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include #include #include #include #include #include #include #include #include #include /* Addresses to scan */ static 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 static const int rpm_ranges[] = { 2000, 4000, 8000, 16000 }; #define FAN_FROM_REG(val, div, rpm_range) ((val) == 0 ? -1 : \ (val) == 255 ? 0 : (rpm_ranges[rpm_range] * 30) / ((div + 1) * (val))) #define TEMP_LIMIT_TO_REG(val) SENSORS_LIMIT((val) / 1000, 0, 255) /* * Client data (each client gets its own) */ struct max6639_data { struct device *hwmon_dev; struct mutex update_lock; char valid; /* !=0 if following fields are valid */ unsigned long last_updated; /* In jiffies */ /* Register values sampled regularly */ u16 temp[2]; /* Temperature, in 1/8 C, 0..255 C */ bool temp_fault[2]; /* Detected temperature diode failure */ u8 fan[2]; /* Register value: TACH count for fans >=30 */ u8 status; /* Detected channel alarms and fan failures */ /* Register values only written to */ u8 pwm[2]; /* Register value: Duty cycle 0..120 */ u8 temp_therm[2]; /* THERM Temperature, 0..255 C (->_max) */ u8 temp_alert[2]; /* ALERT Temperature, 0..255 C (->_crit) */ u8 temp_ot[2]; /* OT Temperature, 0..255 C (->_emergency) */ /* 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 */ }; static struct max6639_data *max6639_update_device(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct max6639_data *data = i2c_get_clientdata(client); struct max6639_data *ret = data; int i; int status_reg; mutex_lock(&data->update_lock); if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) { int res; dev_dbg(&client->dev, "Starting max6639 update\n"); status_reg = i2c_smbus_read_byte_data(client, MAX6639_REG_STATUS); if (status_reg < 0) { ret = ERR_PTR(status_reg); goto abort; } data->status = status_reg; for (i = 0; i < 2; i++) { res = i2c_smbus_read_byte_data(client, MAX6639_REG_FAN_CNT(i)); if (res < 0) { ret = ERR_PTR(res); goto abort; } data->fan[i] = res; res = i2c_smbus_read_byte_data(client, MAX6639_REG_TEMP_EXT(i)); if (res < 0) { ret = ERR_PTR(res); goto abort; } data->temp[i] = res >> 5; data->temp_fault[i] = res & 0x01; res = i2c_smbus_read_byte_data(client, MAX6639_REG_TEMP(i)); if (res < 0) { ret = ERR_PTR(res); goto abort; } data->temp[i] |= res << 3; } data->last_updated = jiffies; data->valid = 1; } abort: mutex_unlock(&data->update_lock); return ret; } static ssize_t show_temp_input(struct device *dev, struct device_attribute *dev_attr, char *buf) { long temp; struct max6639_data *data = max6639_update_device(dev); struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); if (IS_ERR(data)) return PTR_ERR(data); temp = data->temp[attr->index] * 125; return sprintf(buf, "%ld\n", temp); } static ssize_t show_temp_fault(struct device *dev, struct device_attribute *dev_attr, char *buf) { struct max6639_data *data = max6639_update_device(dev); struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); if (IS_ERR(data)) return PTR_ERR(data); return sprintf(buf, "%d\n", data->temp_fault[attr->index]); } static ssize_t show_temp_max(struct device *dev, struct device_attribute *dev_attr, char *buf) { struct i2c_client *client = to_i2c_client(dev); struct max6639_data *data = i2c_get_clientdata(client); struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); return sprintf(buf, "%d\n", (data->temp_therm[attr->index] * 1000)); } static ssize_t set_temp_max(struct device *dev, struct device_attribute *dev_attr, const char *buf, size_t count) { struct i2c_client *client = to_i2c_client(dev); struct max6639_data *data = i2c_get_clientdata(client); struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); unsigned long val; int res; res = strict_strtoul(buf, 10, &val); if (res) return res; mutex_lock(&data->update_lock); data->temp_therm[attr->index] = TEMP_LIMIT_TO_REG(val); i2c_smbus_write_byte_data(client, MAX6639_REG_THERM_LIMIT(attr->index), data->temp_therm[attr->index]); mutex_unlock(&data->update_lock); return count; } static ssize_t show_temp_crit(struct device *dev, struct device_attribute *dev_attr, char *buf) { struct i2c_client *client = to_i2c_client(dev); struct max6639_data *data = i2c_get_clientdata(client); struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); return sprintf(buf, "%d\n", (data->temp_alert[attr->index] * 1000)); } static ssize_t set_temp_crit(struct device *dev, struct device_attribute *dev_attr, const char *buf, size_t count) { struct i2c_client *client = to_i2c_client(dev); struct max6639_data *data = i2c_get_clientdata(client); struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); unsigned long val; int res; res = strict_strtoul(buf, 10, &val); if (res) return res; mutex_lock(&data->update_lock); data->temp_alert[attr->index] = TEMP_LIMIT_TO_REG(val); i2c_smbus_write_byte_data(client, MAX6639_REG_ALERT_LIMIT(attr->index), data->temp_alert[attr->index]); mutex_unlock(&data->update_lock); return count; } static ssize_t show_temp_emergency(struct device *dev, struct device_attribute *dev_attr, char *buf) { struct i2c_client *client = to_i2c_client(dev); struct max6639_data *data = i2c_get_clientdata(client); struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); return sprintf(buf, "%d\n", (data->temp_ot[attr->index] * 1000)); } static ssize_t set_temp_emergency(struct device *dev, struct device_attribute *dev_attr, const char *buf, size_t count) { struct i2c_client *client = to_i2c_client(dev); struct max6639_data *data = i2c_get_clientdata(client); struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); unsigned long val; int res; res = strict_strtoul(buf, 10, &val); if (res) return res; mutex_lock(&data->update_lock); data->temp_ot[attr->index] = TEMP_LIMIT_TO_REG(val); i2c_smbus_write_byte_data(client, MAX6639_REG_OT_LIMIT(attr->index), data->temp_ot[attr->index]); mutex_unlock(&data->update_lock); return count; } static ssize_t show_pwm(struct device *dev, struct device_attribute *dev_attr, char *buf) { struct i2c_client *client = to_i2c_client(dev); struct max6639_data *data = i2c_get_clientdata(client); struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); return sprintf(buf, "%d\n", data->pwm[attr->index] * 255 / 120); } static ssize_t set_pwm(struct device *dev, struct device_attribute *dev_attr, const char *buf, size_t count) { struct i2c_client *client = to_i2c_client(dev); struct max6639_data *data = i2c_get_clientdata(client); struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); unsigned long val; int res; res = strict_strtoul(buf, 10, &val); if (res) return res; val = SENSORS_LIMIT(val, 0, 255); mutex_lock(&data->update_lock); data->pwm[attr->index] = (u8)(val * 120 / 255); i2c_smbus_write_byte_data(client, MAX6639_REG_TARGTDUTY(attr->index), data->pwm[attr->index]); mutex_unlock(&data->update_lock); return count; } static ssize_t show_fan_input(struct device *dev, struct device_attribute *dev_attr, char *buf) { struct max6639_data *data = max6639_update_device(dev); struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); if (IS_ERR(data)) return PTR_ERR(data); return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index], data->ppr, data->rpm_range)); } static ssize_t show_alarm(struct device *dev, struct device_attribute *dev_attr, char *buf) { struct max6639_data *data = max6639_update_device(dev); struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr); if (IS_ERR(data)) return PTR_ERR(data); return sprintf(buf, "%d\n", !!(data->status & (1 << attr->index))); } static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input, NULL, 0); static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input, NULL, 1); static SENSOR_DEVICE_ATTR(temp1_fault, S_IRUGO, show_temp_fault, NULL, 0); static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_temp_fault, NULL, 1); static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max, set_temp_max, 0); static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_max, set_temp_max, 1); static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp_crit, set_temp_crit, 0); static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp_crit, set_temp_crit, 1); static SENSOR_DEVICE_ATTR(temp1_emergency, S_IWUSR | S_IRUGO, show_temp_emergency, set_temp_emergency, 0); static SENSOR_DEVICE_ATTR(temp2_emergency, S_IWUSR | S_IRUGO, show_temp_emergency, set_temp_emergency, 1); static SENSOR_DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, show_pwm, set_pwm, 0); static SENSOR_DEVICE_ATTR(pwm2, S_IWUSR | S_IRUGO, show_pwm, set_pwm, 1); static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input, NULL, 0); static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input, NULL, 1); static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, show_alarm, NULL, 1); static SENSOR_DEVICE_ATTR(fan2_fault, S_IRUGO, show_alarm, NULL, 0); static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 3); static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 2); static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 7); static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 6); static SENSOR_DEVICE_ATTR(temp1_emergency_alarm, S_IRUGO, show_alarm, NULL, 5); static SENSOR_DEVICE_ATTR(temp2_emergency_alarm, S_IRUGO, show_alarm, NULL, 4); static struct attribute *max6639_attributes[] = { &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 }; static const struct attribute_group max6639_group = { .attrs = max6639_attributes, }; /* * 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_init_client(struct i2c_client *client) { struct max6639_data *data = i2c_get_clientdata(client); struct max6639_platform_data *max6639_info = client->dev.platform_data; int i = 0; int rpm_range = 1; /* default: 4000 RPM */ int err = 0; /* Reset chip to default values, see below for GCONFIG setup */ err = i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG, MAX6639_GCONFIG_POR); if (err) goto exit; /* Fans pulse per revolution is 2 by default */ if (max6639_info && max6639_info->ppr > 0 && max6639_info->ppr < 5) data->ppr = max6639_info->ppr; else data->ppr = 2; data->ppr -= 1; err = i2c_smbus_write_byte_data(client, MAX6639_REG_FAN_PPR(i), data->ppr << 5); if (err) goto exit; if (max6639_info) rpm_range = rpm_range_to_reg(max6639_info->rpm_range); data->rpm_range = rpm_range; for (i = 0; i < 2; i++) { /* Fans config PWM, RPM */ err = i2c_smbus_write_byte_data(client, MAX6639_REG_FAN_CONFIG1(i), MAX6639_FAN_CONFIG1_PWM | rpm_range); if (err) goto exit; /* Fans PWM polarity high by default */ if (max6639_info && max6639_info->pwm_polarity == 0) err = i2c_smbus_write_byte_data(client, MAX6639_REG_FAN_CONFIG2a(i), 0x00); else err = i2c_smbus_write_byte_data(client, MAX6639_REG_FAN_CONFIG2a(i), 0x02); if (err) goto exit; /* * /THERM full speed enable, * PWM frequency 25kHz, see also GCONFIG below */ err = i2c_smbus_write_byte_data(client, MAX6639_REG_FAN_CONFIG3(i), MAX6639_FAN_CONFIG3_THERM_FULL_SPEED | 0x03); if (err) goto exit; /* Max. temp. 80C/90C/100C */ data->temp_therm[i] = 80; data->temp_alert[i] = 90; data->temp_ot[i] = 100; err = i2c_smbus_write_byte_data(client, MAX6639_REG_THERM_LIMIT(i), data->temp_therm[i]); if (err) goto exit; err = i2c_smbus_write_byte_data(client, MAX6639_REG_ALERT_LIMIT(i), data->temp_alert[i]); if (err) goto exit; err = i2c_smbus_write_byte_data(client, MAX6639_REG_OT_LIMIT(i), data->temp_ot[i]); if (err) goto exit; /* PWM 120/120 (i.e. 100%) */ data->pwm[i] = 120; err = i2c_smbus_write_byte_data(client, MAX6639_REG_TARGTDUTY(i), data->pwm[i]); if (err) goto exit; } /* Start monitoring */ err = i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG, MAX6639_GCONFIG_DISABLE_TIMEOUT | MAX6639_GCONFIG_CH2_LOCAL | MAX6639_GCONFIG_PWM_FREQ_HI); exit: return err; } /* 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; strlcpy(info->type, "max6639", I2C_NAME_SIZE); return 0; } static int max6639_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct max6639_data *data; int err; data = kzalloc(sizeof(struct max6639_data), GFP_KERNEL); if (!data) { err = -ENOMEM; goto exit; } i2c_set_clientdata(client, data); mutex_init(&data->update_lock); /* Initialize the max6639 chip */ err = max6639_init_client(client); if (err < 0) goto error_free; /* Register sysfs hooks */ err = sysfs_create_group(&client->dev.kobj, &max6639_group); if (err) goto error_free; data->hwmon_dev = hwmon_device_register(&client->dev); if (IS_ERR(data->hwmon_dev)) { err = PTR_ERR(data->hwmon_dev); goto error_remove; } dev_info(&client->dev, "temperature sensor and fan control found\n"); return 0; error_remove: sysfs_remove_group(&client->dev.kobj, &max6639_group); error_free: kfree(data); exit: return err; } static int max6639_remove(struct i2c_client *client) { struct max6639_data *data = i2c_get_clientdata(client); hwmon_device_unregister(data->hwmon_dev); sysfs_remove_group(&client->dev.kobj, &max6639_group); kfree(data); return 0; } static int max6639_suspend(struct i2c_client *client, pm_message_t mesg) { int data = i2c_smbus_read_byte_data(client, MAX6639_REG_GCONFIG); if (data < 0) return data; return i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG, data | MAX6639_GCONFIG_STANDBY); } static int max6639_resume(struct i2c_client *client) { int data = i2c_smbus_read_byte_data(client, MAX6639_REG_GCONFIG); if (data < 0) return data; return i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG, data & ~MAX6639_GCONFIG_STANDBY); } static const struct i2c_device_id max6639_id[] = { {"max6639", 0}, { } }; MODULE_DEVICE_TABLE(i2c, max6639_id); static struct i2c_driver max6639_driver = { .class = I2C_CLASS_HWMON, .driver = { .name = "max6639", }, .probe = max6639_probe, .remove = max6639_remove, .suspend = max6639_suspend, .resume = max6639_resume, .id_table = max6639_id, .detect = max6639_detect, .address_list = normal_i2c, }; static int __init max6639_init(void) { return i2c_add_driver(&max6639_driver); } static void __exit max6639_exit(void) { i2c_del_driver(&max6639_driver); } MODULE_AUTHOR("Roland Stigge "); MODULE_DESCRIPTION("max6639 driver"); MODULE_LICENSE("GPL"); module_init(max6639_init); module_exit(max6639_exit);