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