505 строки
12 KiB
C
505 строки
12 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* max31790.c - Part of lm_sensors, Linux kernel modules for hardware
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* monitoring.
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*
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* (C) 2015 by Il Han <corone.il.han@gmail.com>
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*/
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#include <linux/err.h>
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#include <linux/hwmon.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/slab.h>
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/* MAX31790 registers */
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#define MAX31790_REG_GLOBAL_CONFIG 0x00
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#define MAX31790_REG_FAN_CONFIG(ch) (0x02 + (ch))
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#define MAX31790_REG_FAN_DYNAMICS(ch) (0x08 + (ch))
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#define MAX31790_REG_FAN_FAULT_STATUS2 0x10
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#define MAX31790_REG_FAN_FAULT_STATUS1 0x11
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#define MAX31790_REG_TACH_COUNT(ch) (0x18 + (ch) * 2)
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#define MAX31790_REG_PWM_DUTY_CYCLE(ch) (0x30 + (ch) * 2)
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#define MAX31790_REG_PWMOUT(ch) (0x40 + (ch) * 2)
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#define MAX31790_REG_TARGET_COUNT(ch) (0x50 + (ch) * 2)
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/* Fan Config register bits */
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#define MAX31790_FAN_CFG_RPM_MODE 0x80
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#define MAX31790_FAN_CFG_TACH_INPUT_EN 0x08
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#define MAX31790_FAN_CFG_TACH_INPUT 0x01
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/* Fan Dynamics register bits */
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#define MAX31790_FAN_DYN_SR_SHIFT 5
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#define MAX31790_FAN_DYN_SR_MASK 0xE0
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#define SR_FROM_REG(reg) (((reg) & MAX31790_FAN_DYN_SR_MASK) \
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>> MAX31790_FAN_DYN_SR_SHIFT)
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#define FAN_RPM_MIN 120
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#define FAN_RPM_MAX 7864320
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#define RPM_FROM_REG(reg, sr) (((reg) >> 4) ? \
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((60 * (sr) * 8192) / ((reg) >> 4)) : \
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FAN_RPM_MAX)
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#define RPM_TO_REG(rpm, sr) ((60 * (sr) * 8192) / ((rpm) * 2))
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#define NR_CHANNEL 6
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/*
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* Client data (each client gets its own)
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*/
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struct max31790_data {
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struct i2c_client *client;
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struct mutex update_lock;
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bool valid; /* zero until following fields are valid */
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unsigned long last_updated; /* in jiffies */
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/* register values */
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u8 fan_config[NR_CHANNEL];
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u8 fan_dynamics[NR_CHANNEL];
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u16 fault_status;
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u16 tach[NR_CHANNEL * 2];
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u16 pwm[NR_CHANNEL];
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u16 target_count[NR_CHANNEL];
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};
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static struct max31790_data *max31790_update_device(struct device *dev)
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{
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struct max31790_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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struct max31790_data *ret = data;
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int i;
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int rv;
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mutex_lock(&data->update_lock);
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if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
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rv = i2c_smbus_read_byte_data(client,
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MAX31790_REG_FAN_FAULT_STATUS1);
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if (rv < 0)
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goto abort;
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data->fault_status = rv & 0x3F;
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rv = i2c_smbus_read_byte_data(client,
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MAX31790_REG_FAN_FAULT_STATUS2);
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if (rv < 0)
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goto abort;
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data->fault_status |= (rv & 0x3F) << 6;
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for (i = 0; i < NR_CHANNEL; i++) {
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rv = i2c_smbus_read_word_swapped(client,
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MAX31790_REG_TACH_COUNT(i));
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if (rv < 0)
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goto abort;
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data->tach[i] = rv;
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if (data->fan_config[i]
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& MAX31790_FAN_CFG_TACH_INPUT) {
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rv = i2c_smbus_read_word_swapped(client,
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MAX31790_REG_TACH_COUNT(NR_CHANNEL
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+ i));
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if (rv < 0)
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goto abort;
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data->tach[NR_CHANNEL + i] = rv;
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} else {
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rv = i2c_smbus_read_word_swapped(client,
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MAX31790_REG_PWMOUT(i));
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if (rv < 0)
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goto abort;
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data->pwm[i] = rv;
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rv = i2c_smbus_read_word_swapped(client,
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MAX31790_REG_TARGET_COUNT(i));
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if (rv < 0)
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goto abort;
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data->target_count[i] = rv;
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}
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}
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data->last_updated = jiffies;
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data->valid = true;
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}
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goto done;
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abort:
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data->valid = false;
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ret = ERR_PTR(rv);
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done:
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mutex_unlock(&data->update_lock);
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return ret;
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}
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static const u8 tach_period[8] = { 1, 2, 4, 8, 16, 32, 32, 32 };
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static u8 get_tach_period(u8 fan_dynamics)
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{
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return tach_period[SR_FROM_REG(fan_dynamics)];
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}
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static u8 bits_for_tach_period(int rpm)
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{
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u8 bits;
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if (rpm < 500)
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bits = 0x0;
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else if (rpm < 1000)
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bits = 0x1;
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else if (rpm < 2000)
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bits = 0x2;
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else if (rpm < 4000)
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bits = 0x3;
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else if (rpm < 8000)
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bits = 0x4;
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else
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bits = 0x5;
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return bits;
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}
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static int max31790_read_fan(struct device *dev, u32 attr, int channel,
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long *val)
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{
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struct max31790_data *data = max31790_update_device(dev);
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int sr, rpm;
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if (IS_ERR(data))
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return PTR_ERR(data);
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switch (attr) {
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case hwmon_fan_input:
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sr = get_tach_period(data->fan_dynamics[channel]);
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rpm = RPM_FROM_REG(data->tach[channel], sr);
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*val = rpm;
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return 0;
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case hwmon_fan_target:
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sr = get_tach_period(data->fan_dynamics[channel]);
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rpm = RPM_FROM_REG(data->target_count[channel], sr);
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*val = rpm;
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return 0;
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case hwmon_fan_fault:
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*val = !!(data->fault_status & (1 << channel));
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return 0;
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default:
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return -EOPNOTSUPP;
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}
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}
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static int max31790_write_fan(struct device *dev, u32 attr, int channel,
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long val)
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{
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struct max31790_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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int target_count;
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int err = 0;
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u8 bits;
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int sr;
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mutex_lock(&data->update_lock);
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switch (attr) {
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case hwmon_fan_target:
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val = clamp_val(val, FAN_RPM_MIN, FAN_RPM_MAX);
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bits = bits_for_tach_period(val);
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data->fan_dynamics[channel] =
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((data->fan_dynamics[channel] &
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~MAX31790_FAN_DYN_SR_MASK) |
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(bits << MAX31790_FAN_DYN_SR_SHIFT));
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err = i2c_smbus_write_byte_data(client,
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MAX31790_REG_FAN_DYNAMICS(channel),
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data->fan_dynamics[channel]);
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if (err < 0)
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break;
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sr = get_tach_period(data->fan_dynamics[channel]);
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target_count = RPM_TO_REG(val, sr);
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target_count = clamp_val(target_count, 0x1, 0x7FF);
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data->target_count[channel] = target_count << 5;
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err = i2c_smbus_write_word_swapped(client,
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MAX31790_REG_TARGET_COUNT(channel),
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data->target_count[channel]);
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break;
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default:
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err = -EOPNOTSUPP;
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break;
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}
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mutex_unlock(&data->update_lock);
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return err;
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}
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static umode_t max31790_fan_is_visible(const void *_data, u32 attr, int channel)
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{
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const struct max31790_data *data = _data;
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u8 fan_config = data->fan_config[channel % NR_CHANNEL];
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switch (attr) {
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case hwmon_fan_input:
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case hwmon_fan_fault:
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if (channel < NR_CHANNEL ||
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(fan_config & MAX31790_FAN_CFG_TACH_INPUT))
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return 0444;
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return 0;
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case hwmon_fan_target:
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if (channel < NR_CHANNEL &&
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!(fan_config & MAX31790_FAN_CFG_TACH_INPUT))
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return 0644;
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return 0;
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default:
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return 0;
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}
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}
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static int max31790_read_pwm(struct device *dev, u32 attr, int channel,
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long *val)
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{
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struct max31790_data *data = max31790_update_device(dev);
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u8 fan_config;
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if (IS_ERR(data))
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return PTR_ERR(data);
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fan_config = data->fan_config[channel];
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switch (attr) {
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case hwmon_pwm_input:
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*val = data->pwm[channel] >> 8;
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return 0;
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case hwmon_pwm_enable:
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if (fan_config & MAX31790_FAN_CFG_RPM_MODE)
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*val = 2;
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else if (fan_config & MAX31790_FAN_CFG_TACH_INPUT_EN)
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*val = 1;
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else
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*val = 0;
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return 0;
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default:
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return -EOPNOTSUPP;
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}
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}
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static int max31790_write_pwm(struct device *dev, u32 attr, int channel,
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long val)
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{
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struct max31790_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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u8 fan_config;
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int err = 0;
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mutex_lock(&data->update_lock);
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switch (attr) {
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case hwmon_pwm_input:
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if (val < 0 || val > 255) {
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err = -EINVAL;
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break;
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}
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data->pwm[channel] = val << 8;
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err = i2c_smbus_write_word_swapped(client,
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MAX31790_REG_PWMOUT(channel),
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data->pwm[channel]);
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break;
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case hwmon_pwm_enable:
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fan_config = data->fan_config[channel];
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if (val == 0) {
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fan_config &= ~(MAX31790_FAN_CFG_TACH_INPUT_EN |
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MAX31790_FAN_CFG_RPM_MODE);
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} else if (val == 1) {
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fan_config = (fan_config |
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MAX31790_FAN_CFG_TACH_INPUT_EN) &
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~MAX31790_FAN_CFG_RPM_MODE;
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} else if (val == 2) {
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fan_config |= MAX31790_FAN_CFG_TACH_INPUT_EN |
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MAX31790_FAN_CFG_RPM_MODE;
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} else {
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err = -EINVAL;
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break;
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}
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data->fan_config[channel] = fan_config;
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err = i2c_smbus_write_byte_data(client,
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MAX31790_REG_FAN_CONFIG(channel),
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fan_config);
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break;
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default:
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err = -EOPNOTSUPP;
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break;
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}
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mutex_unlock(&data->update_lock);
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return err;
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}
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static umode_t max31790_pwm_is_visible(const void *_data, u32 attr, int channel)
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{
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const struct max31790_data *data = _data;
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u8 fan_config = data->fan_config[channel];
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switch (attr) {
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case hwmon_pwm_input:
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case hwmon_pwm_enable:
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if (!(fan_config & MAX31790_FAN_CFG_TACH_INPUT))
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return 0644;
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return 0;
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default:
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return 0;
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}
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}
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static int max31790_read(struct device *dev, enum hwmon_sensor_types type,
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u32 attr, int channel, long *val)
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{
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switch (type) {
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case hwmon_fan:
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return max31790_read_fan(dev, attr, channel, val);
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case hwmon_pwm:
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return max31790_read_pwm(dev, attr, channel, val);
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default:
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return -EOPNOTSUPP;
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}
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}
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static int max31790_write(struct device *dev, enum hwmon_sensor_types type,
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u32 attr, int channel, long val)
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{
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switch (type) {
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case hwmon_fan:
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return max31790_write_fan(dev, attr, channel, val);
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case hwmon_pwm:
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return max31790_write_pwm(dev, attr, channel, val);
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default:
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return -EOPNOTSUPP;
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}
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}
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static umode_t max31790_is_visible(const void *data,
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enum hwmon_sensor_types type,
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u32 attr, int channel)
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{
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switch (type) {
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case hwmon_fan:
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return max31790_fan_is_visible(data, attr, channel);
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case hwmon_pwm:
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return max31790_pwm_is_visible(data, attr, channel);
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default:
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return 0;
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}
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}
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static const struct hwmon_channel_info *max31790_info[] = {
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HWMON_CHANNEL_INFO(fan,
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HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
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HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
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HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
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HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
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HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
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HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT,
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HWMON_F_INPUT | HWMON_F_FAULT,
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HWMON_F_INPUT | HWMON_F_FAULT,
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HWMON_F_INPUT | HWMON_F_FAULT,
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HWMON_F_INPUT | HWMON_F_FAULT,
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HWMON_F_INPUT | HWMON_F_FAULT,
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HWMON_F_INPUT | HWMON_F_FAULT),
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HWMON_CHANNEL_INFO(pwm,
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HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
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HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
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HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
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HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
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HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
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HWMON_PWM_INPUT | HWMON_PWM_ENABLE),
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NULL
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};
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static const struct hwmon_ops max31790_hwmon_ops = {
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.is_visible = max31790_is_visible,
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.read = max31790_read,
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.write = max31790_write,
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};
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static const struct hwmon_chip_info max31790_chip_info = {
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.ops = &max31790_hwmon_ops,
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.info = max31790_info,
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};
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static int max31790_init_client(struct i2c_client *client,
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struct max31790_data *data)
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{
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int i, rv;
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for (i = 0; i < NR_CHANNEL; i++) {
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rv = i2c_smbus_read_byte_data(client,
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MAX31790_REG_FAN_CONFIG(i));
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if (rv < 0)
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return rv;
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data->fan_config[i] = rv;
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rv = i2c_smbus_read_byte_data(client,
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MAX31790_REG_FAN_DYNAMICS(i));
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if (rv < 0)
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return rv;
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data->fan_dynamics[i] = rv;
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}
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return 0;
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}
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static int max31790_probe(struct i2c_client *client)
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{
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struct i2c_adapter *adapter = client->adapter;
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struct device *dev = &client->dev;
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struct max31790_data *data;
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struct device *hwmon_dev;
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int err;
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if (!i2c_check_functionality(adapter,
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I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA))
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return -ENODEV;
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data = devm_kzalloc(dev, sizeof(struct max31790_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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/*
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* Initialize the max31790 chip
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*/
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err = max31790_init_client(client, data);
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if (err)
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return err;
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hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
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data,
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&max31790_chip_info,
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NULL);
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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 max31790_id[] = {
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{ "max31790", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, max31790_id);
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static struct i2c_driver max31790_driver = {
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.class = I2C_CLASS_HWMON,
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.probe_new = max31790_probe,
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.driver = {
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.name = "max31790",
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},
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.id_table = max31790_id,
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};
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module_i2c_driver(max31790_driver);
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MODULE_AUTHOR("Il Han <corone.il.han@gmail.com>");
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MODULE_DESCRIPTION("MAX31790 sensor driver");
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MODULE_LICENSE("GPL");
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