From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- drivers/hwmon/tc654.c | 572 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 572 insertions(+) create mode 100644 drivers/hwmon/tc654.c (limited to 'drivers/hwmon/tc654.c') diff --git a/drivers/hwmon/tc654.c b/drivers/hwmon/tc654.c new file mode 100644 index 000000000..54cd33d09 --- /dev/null +++ b/drivers/hwmon/tc654.c @@ -0,0 +1,572 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * tc654.c - Linux kernel modules for fan speed controller + * + * Copyright (C) 2016 Allied Telesis Labs NZ + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +enum tc654_regs { + TC654_REG_RPM1 = 0x00, /* RPM Output 1 */ + TC654_REG_RPM2 = 0x01, /* RPM Output 2 */ + TC654_REG_FAN_FAULT1 = 0x02, /* Fan Fault 1 Threshold */ + TC654_REG_FAN_FAULT2 = 0x03, /* Fan Fault 2 Threshold */ + TC654_REG_CONFIG = 0x04, /* Configuration */ + TC654_REG_STATUS = 0x05, /* Status */ + TC654_REG_DUTY_CYCLE = 0x06, /* Fan Speed Duty Cycle */ + TC654_REG_MFR_ID = 0x07, /* Manufacturer Identification */ + TC654_REG_VER_ID = 0x08, /* Version Identification */ +}; + +/* Macros to easily index the registers */ +#define TC654_REG_RPM(idx) (TC654_REG_RPM1 + (idx)) +#define TC654_REG_FAN_FAULT(idx) (TC654_REG_FAN_FAULT1 + (idx)) + +/* Config register bits */ +#define TC654_REG_CONFIG_RES BIT(6) /* Resolution Selection */ +#define TC654_REG_CONFIG_DUTYC BIT(5) /* Duty Cycle Control */ +#define TC654_REG_CONFIG_SDM BIT(0) /* Shutdown Mode */ + +/* Status register bits */ +#define TC654_REG_STATUS_F2F BIT(1) /* Fan 2 Fault */ +#define TC654_REG_STATUS_F1F BIT(0) /* Fan 1 Fault */ + +/* RPM resolution for RPM Output registers */ +#define TC654_HIGH_RPM_RESOLUTION 25 /* 25 RPM resolution */ +#define TC654_LOW_RPM_RESOLUTION 50 /* 50 RPM resolution */ + +/* Convert to the fan fault RPM threshold from register value */ +#define TC654_FAN_FAULT_FROM_REG(val) ((val) * 50) /* 50 RPM resolution */ + +/* Convert to register value from the fan fault RPM threshold */ +#define TC654_FAN_FAULT_TO_REG(val) (((val) / 50) & 0xff) + +/* Register data is read (and cached) at most once per second. */ +#define TC654_UPDATE_INTERVAL HZ + +struct tc654_data { + struct i2c_client *client; + + /* update mutex */ + struct mutex update_lock; + + /* tc654 register cache */ + bool valid; + unsigned long last_updated; /* in jiffies */ + + u8 rpm_output[2]; /* The fan RPM data for fans 1 and 2 is then + * written to registers RPM1 and RPM2 + */ + u8 fan_fault[2]; /* The Fan Fault Threshold Registers are used to + * set the fan fault threshold levels for fan 1 + * and fan 2 + */ + u8 config; /* The Configuration Register is an 8-bit read/ + * writable multi-function control register + * 7: Fan Fault Clear + * 1 = Clear Fan Fault + * 0 = Normal Operation (default) + * 6: Resolution Selection for RPM Output Registers + * RPM Output Registers (RPM1 and RPM2) will be + * set for + * 1 = 25 RPM (9-bit) resolution + * 0 = 50 RPM (8-bit) resolution (default) + * 5: Duty Cycle Control Method + * The V OUT duty cycle will be controlled via + * 1 = the SMBus interface. + * 0 = via the V IN analog input pin. (default) + * 4,3: Fan 2 Pulses Per Rotation + * 00 = 1 + * 01 = 2 (default) + * 10 = 4 + * 11 = 8 + * 2,1: Fan 1 Pulses Per Rotation + * 00 = 1 + * 01 = 2 (default) + * 10 = 4 + * 11 = 8 + * 0: Shutdown Mode + * 1 = Shutdown mode. + * 0 = Normal operation. (default) + */ + u8 status; /* The Status register provides all the information + * about what is going on within the TC654/TC655 + * devices. + * 7,6: Unimplemented, Read as '0' + * 5: Over-Temperature Fault Condition + * 1 = Over-Temperature condition has occurred + * 0 = Normal operation. V IN is less than 2.6V + * 4: RPM2 Counter Overflow + * 1 = Fault condition + * 0 = Normal operation + * 3: RPM1 Counter Overflow + * 1 = Fault condition + * 0 = Normal operation + * 2: V IN Input Status + * 1 = V IN is open + * 0 = Normal operation. voltage present at V IN + * 1: Fan 2 Fault + * 1 = Fault condition + * 0 = Normal operation + * 0: Fan 1 Fault + * 1 = Fault condition + * 0 = Normal operation + */ + u8 duty_cycle; /* The DUTY_CYCLE register is a 4-bit read/ + * writable register used to control the duty + * cycle of the V OUT output. + */ +}; + +/* helper to grab and cache data, at most one time per second */ +static struct tc654_data *tc654_update_client(struct device *dev) +{ + struct tc654_data *data = dev_get_drvdata(dev); + struct i2c_client *client = data->client; + int ret = 0; + + mutex_lock(&data->update_lock); + if (time_before(jiffies, data->last_updated + TC654_UPDATE_INTERVAL) && + likely(data->valid)) + goto out; + + ret = i2c_smbus_read_byte_data(client, TC654_REG_RPM(0)); + if (ret < 0) + goto out; + data->rpm_output[0] = ret; + + ret = i2c_smbus_read_byte_data(client, TC654_REG_RPM(1)); + if (ret < 0) + goto out; + data->rpm_output[1] = ret; + + ret = i2c_smbus_read_byte_data(client, TC654_REG_FAN_FAULT(0)); + if (ret < 0) + goto out; + data->fan_fault[0] = ret; + + ret = i2c_smbus_read_byte_data(client, TC654_REG_FAN_FAULT(1)); + if (ret < 0) + goto out; + data->fan_fault[1] = ret; + + ret = i2c_smbus_read_byte_data(client, TC654_REG_CONFIG); + if (ret < 0) + goto out; + data->config = ret; + + ret = i2c_smbus_read_byte_data(client, TC654_REG_STATUS); + if (ret < 0) + goto out; + data->status = ret; + + ret = i2c_smbus_read_byte_data(client, TC654_REG_DUTY_CYCLE); + if (ret < 0) + goto out; + data->duty_cycle = ret & 0x0f; + + data->last_updated = jiffies; + data->valid = true; +out: + mutex_unlock(&data->update_lock); + + if (ret < 0) /* upon error, encode it in return value */ + data = ERR_PTR(ret); + + return data; +} + +/* + * sysfs attributes + */ + +static ssize_t fan_show(struct device *dev, struct device_attribute *da, + char *buf) +{ + int nr = to_sensor_dev_attr(da)->index; + struct tc654_data *data = tc654_update_client(dev); + int val; + + if (IS_ERR(data)) + return PTR_ERR(data); + + if (data->config & TC654_REG_CONFIG_RES) + val = data->rpm_output[nr] * TC654_HIGH_RPM_RESOLUTION; + else + val = data->rpm_output[nr] * TC654_LOW_RPM_RESOLUTION; + + return sprintf(buf, "%d\n", val); +} + +static ssize_t fan_min_show(struct device *dev, struct device_attribute *da, + char *buf) +{ + int nr = to_sensor_dev_attr(da)->index; + struct tc654_data *data = tc654_update_client(dev); + + if (IS_ERR(data)) + return PTR_ERR(data); + + return sprintf(buf, "%d\n", + TC654_FAN_FAULT_FROM_REG(data->fan_fault[nr])); +} + +static ssize_t fan_min_store(struct device *dev, struct device_attribute *da, + const char *buf, size_t count) +{ + int nr = to_sensor_dev_attr(da)->index; + struct tc654_data *data = dev_get_drvdata(dev); + struct i2c_client *client = data->client; + unsigned long val; + int ret; + + if (kstrtoul(buf, 10, &val)) + return -EINVAL; + + val = clamp_val(val, 0, 12750); + + mutex_lock(&data->update_lock); + + data->fan_fault[nr] = TC654_FAN_FAULT_TO_REG(val); + ret = i2c_smbus_write_byte_data(client, TC654_REG_FAN_FAULT(nr), + data->fan_fault[nr]); + + mutex_unlock(&data->update_lock); + return ret < 0 ? ret : count; +} + +static ssize_t fan_alarm_show(struct device *dev, struct device_attribute *da, + char *buf) +{ + int nr = to_sensor_dev_attr(da)->index; + struct tc654_data *data = tc654_update_client(dev); + int val; + + if (IS_ERR(data)) + return PTR_ERR(data); + + if (nr == 0) + val = !!(data->status & TC654_REG_STATUS_F1F); + else + val = !!(data->status & TC654_REG_STATUS_F2F); + + return sprintf(buf, "%d\n", val); +} + +static const u8 TC654_FAN_PULSE_SHIFT[] = { 1, 3 }; + +static ssize_t fan_pulses_show(struct device *dev, + struct device_attribute *da, char *buf) +{ + int nr = to_sensor_dev_attr(da)->index; + struct tc654_data *data = tc654_update_client(dev); + u8 val; + + if (IS_ERR(data)) + return PTR_ERR(data); + + val = BIT((data->config >> TC654_FAN_PULSE_SHIFT[nr]) & 0x03); + return sprintf(buf, "%d\n", val); +} + +static ssize_t fan_pulses_store(struct device *dev, + struct device_attribute *da, const char *buf, + size_t count) +{ + int nr = to_sensor_dev_attr(da)->index; + struct tc654_data *data = dev_get_drvdata(dev); + struct i2c_client *client = data->client; + u8 config; + unsigned long val; + int ret; + + if (kstrtoul(buf, 10, &val)) + return -EINVAL; + + switch (val) { + case 1: + config = 0; + break; + case 2: + config = 1; + break; + case 4: + config = 2; + break; + case 8: + config = 3; + break; + default: + return -EINVAL; + } + + mutex_lock(&data->update_lock); + + data->config &= ~(0x03 << TC654_FAN_PULSE_SHIFT[nr]); + data->config |= (config << TC654_FAN_PULSE_SHIFT[nr]); + ret = i2c_smbus_write_byte_data(client, TC654_REG_CONFIG, data->config); + + mutex_unlock(&data->update_lock); + return ret < 0 ? ret : count; +} + +static ssize_t pwm_mode_show(struct device *dev, struct device_attribute *da, + char *buf) +{ + struct tc654_data *data = tc654_update_client(dev); + + if (IS_ERR(data)) + return PTR_ERR(data); + + return sprintf(buf, "%d\n", !!(data->config & TC654_REG_CONFIG_DUTYC)); +} + +static ssize_t pwm_mode_store(struct device *dev, struct device_attribute *da, + const char *buf, size_t count) +{ + struct tc654_data *data = dev_get_drvdata(dev); + struct i2c_client *client = data->client; + unsigned long val; + int ret; + + if (kstrtoul(buf, 10, &val)) + return -EINVAL; + + if (val != 0 && val != 1) + return -EINVAL; + + mutex_lock(&data->update_lock); + + if (val) + data->config |= TC654_REG_CONFIG_DUTYC; + else + data->config &= ~TC654_REG_CONFIG_DUTYC; + + ret = i2c_smbus_write_byte_data(client, TC654_REG_CONFIG, data->config); + + mutex_unlock(&data->update_lock); + return ret < 0 ? ret : count; +} + +static const int tc654_pwm_map[16] = { 77, 88, 102, 112, 124, 136, 148, 160, + 172, 184, 196, 207, 219, 231, 243, 255}; + +static ssize_t pwm_show(struct device *dev, struct device_attribute *da, + char *buf) +{ + struct tc654_data *data = tc654_update_client(dev); + int pwm; + + if (IS_ERR(data)) + return PTR_ERR(data); + + if (data->config & TC654_REG_CONFIG_SDM) + pwm = 0; + else + pwm = tc654_pwm_map[data->duty_cycle]; + + return sprintf(buf, "%d\n", pwm); +} + +static int _set_pwm(struct tc654_data *data, unsigned long val) +{ + struct i2c_client *client = data->client; + int ret; + + mutex_lock(&data->update_lock); + + if (val == 0) { + data->config |= TC654_REG_CONFIG_SDM; + data->duty_cycle = 0; + } else { + data->config &= ~TC654_REG_CONFIG_SDM; + data->duty_cycle = val - 1; + } + + ret = i2c_smbus_write_byte_data(client, TC654_REG_CONFIG, data->config); + if (ret < 0) + goto out; + + ret = i2c_smbus_write_byte_data(client, TC654_REG_DUTY_CYCLE, + data->duty_cycle); + +out: + mutex_unlock(&data->update_lock); + return ret; +} + +static ssize_t pwm_store(struct device *dev, struct device_attribute *da, + const char *buf, size_t count) +{ + struct tc654_data *data = dev_get_drvdata(dev); + unsigned long val; + int ret; + + if (kstrtoul(buf, 10, &val)) + return -EINVAL; + if (val > 255) + return -EINVAL; + if (val > 0) + val = find_closest(val, tc654_pwm_map, ARRAY_SIZE(tc654_pwm_map)) + 1; + + ret = _set_pwm(data, val); + return ret < 0 ? ret : count; +} + +static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, 0); +static SENSOR_DEVICE_ATTR_RO(fan2_input, fan, 1); +static SENSOR_DEVICE_ATTR_RW(fan1_min, fan_min, 0); +static SENSOR_DEVICE_ATTR_RW(fan2_min, fan_min, 1); +static SENSOR_DEVICE_ATTR_RO(fan1_alarm, fan_alarm, 0); +static SENSOR_DEVICE_ATTR_RO(fan2_alarm, fan_alarm, 1); +static SENSOR_DEVICE_ATTR_RW(fan1_pulses, fan_pulses, 0); +static SENSOR_DEVICE_ATTR_RW(fan2_pulses, fan_pulses, 1); +static SENSOR_DEVICE_ATTR_RW(pwm1_mode, pwm_mode, 0); +static SENSOR_DEVICE_ATTR_RW(pwm1, pwm, 0); + +/* Driver data */ +static struct attribute *tc654_attrs[] = { + &sensor_dev_attr_fan1_input.dev_attr.attr, + &sensor_dev_attr_fan2_input.dev_attr.attr, + &sensor_dev_attr_fan1_min.dev_attr.attr, + &sensor_dev_attr_fan2_min.dev_attr.attr, + &sensor_dev_attr_fan1_alarm.dev_attr.attr, + &sensor_dev_attr_fan2_alarm.dev_attr.attr, + &sensor_dev_attr_fan1_pulses.dev_attr.attr, + &sensor_dev_attr_fan2_pulses.dev_attr.attr, + &sensor_dev_attr_pwm1_mode.dev_attr.attr, + &sensor_dev_attr_pwm1.dev_attr.attr, + NULL +}; + +ATTRIBUTE_GROUPS(tc654); + +/* + * thermal cooling device functions + * + * Account for the "ShutDown Mode (SDM)" state by offsetting + * the 16 PWM duty cycle states by 1. + * + * State 0 = 0% PWM | Shutdown - Fan(s) are off + * State 1 = 30% PWM | duty_cycle = 0 + * State 2 = ~35% PWM | duty_cycle = 1 + * [...] + * State 15 = ~95% PWM | duty_cycle = 14 + * State 16 = 100% PWM | duty_cycle = 15 + */ +#define TC654_MAX_COOLING_STATE 16 + +static int tc654_get_max_state(struct thermal_cooling_device *cdev, unsigned long *state) +{ + *state = TC654_MAX_COOLING_STATE; + return 0; +} + +static int tc654_get_cur_state(struct thermal_cooling_device *cdev, unsigned long *state) +{ + struct tc654_data *data = tc654_update_client(cdev->devdata); + + if (IS_ERR(data)) + return PTR_ERR(data); + + if (data->config & TC654_REG_CONFIG_SDM) + *state = 0; /* FAN is off */ + else + *state = data->duty_cycle + 1; /* offset PWM States by 1 */ + + return 0; +} + +static int tc654_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state) +{ + struct tc654_data *data = tc654_update_client(cdev->devdata); + + if (IS_ERR(data)) + return PTR_ERR(data); + + return _set_pwm(data, clamp_val(state, 0, TC654_MAX_COOLING_STATE)); +} + +static const struct thermal_cooling_device_ops tc654_fan_cool_ops = { + .get_max_state = tc654_get_max_state, + .get_cur_state = tc654_get_cur_state, + .set_cur_state = tc654_set_cur_state, +}; + +/* + * device probe and removal + */ + +static int tc654_probe(struct i2c_client *client) +{ + struct device *dev = &client->dev; + struct tc654_data *data; + struct device *hwmon_dev; + int ret; + + if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) + return -ENODEV; + + data = devm_kzalloc(dev, sizeof(struct tc654_data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->client = client; + mutex_init(&data->update_lock); + + ret = i2c_smbus_read_byte_data(client, TC654_REG_CONFIG); + if (ret < 0) + return ret; + + data->config = ret; + + hwmon_dev = + devm_hwmon_device_register_with_groups(dev, client->name, data, + tc654_groups); + if (IS_ERR(hwmon_dev)) + return PTR_ERR(hwmon_dev); + + if (IS_ENABLED(CONFIG_THERMAL)) { + struct thermal_cooling_device *cdev; + + cdev = devm_thermal_of_cooling_device_register(dev, dev->of_node, client->name, + hwmon_dev, &tc654_fan_cool_ops); + return PTR_ERR_OR_ZERO(cdev); + } + + return 0; +} + +static const struct i2c_device_id tc654_id[] = { + {"tc654", 0}, + {"tc655", 0}, + {} +}; + +MODULE_DEVICE_TABLE(i2c, tc654_id); + +static struct i2c_driver tc654_driver = { + .driver = { + .name = "tc654", + }, + .probe_new = tc654_probe, + .id_table = tc654_id, +}; + +module_i2c_driver(tc654_driver); + +MODULE_AUTHOR("Allied Telesis Labs"); +MODULE_DESCRIPTION("Microchip TC654/TC655 driver"); +MODULE_LICENSE("GPL"); -- cgit v1.2.3