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504 lines
12 KiB
504 lines
12 KiB
// 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 <[email protected]> |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("MAX31790 sensor driver"); |
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MODULE_LICENSE("GPL");
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