+From 5ea2e152d846bf60901107fefd81a58f792f3bc2 Mon Sep 17 00:00:00 2001
+From: Christian Lamparter <chunkeey@gmail.com>
+Date: Fri, 10 Jun 2016 03:00:46 +0200
+Subject: [PATCH] hwmon: add driver for Microchip TC654/TC655 PWM fan
+ controllers
+
+This patch adds a hwmon driver for the Microchip TC654 and TC655
+Dual SMBus PWM Fan Speed Controllers with Fan Fault detection.
+
+The chip is described in the DS2001734C Spec Document from Microchip.
+It supports:
+ - Shared PWM Fan Drive for two fans
+ - Provides RPM
+ - automatic PWM controller (needs additional
+ NTC/PTC Thermistors.)
+ - Overtemperature alarm (when using NTC/PTC
+ Thermistors)
+
+Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
+---
+ drivers/hwmon/Kconfig | 10 +
+ drivers/hwmon/Makefile | 1 +
+ drivers/hwmon/tc654.c | 969 +++++++++++++++++++++++++++++++++++++++++++++++++
+ 3 files changed, 980 insertions(+)
+ create mode 100644 drivers/hwmon/tc654.c
+
+--- a/drivers/hwmon/Kconfig
++++ b/drivers/hwmon/Kconfig
+@@ -1549,6 +1549,16 @@ config SENSORS_INA3221
+ This driver can also be built as a module. If so, the module
+ will be called ina3221.
+
++config SENSORS_TC654
++ tristate "Microchip TC654 and TC655"
++ depends on I2C
++ help
++ If you say yes here you get support for Microchip TC655 and TC654
++ Dual PWM Fan Speed Controllers and sensor chips.
++
++ This driver can also be built as a module. If so, the module
++ will be called tc654.
++
+ config SENSORS_TC74
+ tristate "Microchip TC74"
+ depends on I2C
+--- a/drivers/hwmon/Makefile
++++ b/drivers/hwmon/Makefile
+@@ -148,6 +148,7 @@ obj-$(CONFIG_SENSORS_SMSC47B397)+= smsc4
+ obj-$(CONFIG_SENSORS_SMSC47M1) += smsc47m1.o
+ obj-$(CONFIG_SENSORS_SMSC47M192)+= smsc47m192.o
+ obj-$(CONFIG_SENSORS_AMC6821) += amc6821.o
++obj-$(CONFIG_SENSORS_TC654) += tc654.o
+ obj-$(CONFIG_SENSORS_TC74) += tc74.o
+ obj-$(CONFIG_SENSORS_THMC50) += thmc50.o
+ obj-$(CONFIG_SENSORS_TMP102) += tmp102.o
+--- /dev/null
++++ b/drivers/hwmon/tc654.c
+@@ -0,0 +1,969 @@
++/*
++ * tc654.c - Support for Microchip TC654/TC655
++ * "A Dual SMBus PWM FAN Speed Controllers with Fan Fault Detection"
++ *
++ * Copyright (c) 2016 Christian Lamparter <chunkeey@gmail.com>
++ *
++ * This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License as published by
++ * the Free Software Foundation version 2 of the License.
++ *
++ * This program is distributed in the hope that it will be useful,
++ * but WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
++ * GNU General Public License for more details.
++ *
++ * The chip is described in the DS2001734C Spec Document from Microchip.
++ */
++
++#include <linux/module.h>
++#include <linux/init.h>
++#include <linux/slab.h>
++#include <linux/jiffies.h>
++#include <linux/i2c.h>
++#include <linux/hwmon.h>
++#include <linux/hwmon-sysfs.h>
++#include <linux/err.h>
++#include <linux/mutex.h>
++#include <linux/thermal.h>
++
++/* Hardware definitions */
++/* 5.1.4 Address Byte stats that TC654/TC655 are fixed at 0x1b */
++static const unsigned short normal_i2c[] = { 0x1b, I2C_CLIENT_END };
++
++enum TC654_REGS {
++ TC654_REG_RPM1 = 0x00,
++ TC654_REG_RPM2,
++ TC654_REG_FAN1_FAULT_THRESH,
++ TC654_REG_FAN2_FAULT_THRESH,
++ TC654_REG_CONFIG,
++ TC654_REG_STATUS,
++ TC654_REG_DUTY_CYCLE,
++ TC654_REG_MFR_ID,
++ TC654_REG_VER_ID,
++
++ /* keep last */
++ __TC654_REG_NUM,
++};
++
++#define TC654_MFR_ID_MICROCHIP 0x84
++#define TC654_VER_ID 0x00
++#define TC655_VER_ID 0x01
++
++enum TC654_CONTROL_BITS {
++ TC654_CTRL_SDM = BIT(0),
++ TC654_CTRL_F1PPR_S = 1,
++ TC654_CTRL_F1PPR_M = (BIT(1) | BIT(2)),
++ TC654_CTRL_F2PPR_S = 3,
++ TC654_CTRL_F2PPR_M = (BIT(3) | BIT(4)),
++ TC654_CTRL_DUTYC = BIT(5),
++ TC654_CTRL_RES = BIT(6),
++ TC654_CTRL_FFCLR = BIT(7),
++};
++
++enum TC654_STATUS_BITS {
++ TC654_STATUS_F1F = BIT(0),
++ TC654_STATUS_F2F = BIT(1),
++ TC654_STATUS_VSTAT = BIT(2),
++ TC654_STATUS_R1CO = BIT(3),
++ TC654_STATUS_R2CO = BIT(4),
++ TC654_STATUS_OTF = BIT(5),
++};
++
++enum TC654_FAN {
++ TC654_FAN1 = 0,
++ TC654_FAN2,
++
++ /* keep last */
++ __NUM_TC654_FAN,
++};
++
++enum TC654_FAN_MODE {
++ TC654_PWM_OFF, /* Shutdown Mode - switch of both fans */
++ TC654_PWM_VIN, /* Fans will be controlled via V_in analog input pin */
++ TC654_PWM_3000, /* sets fans to 30% duty cycle */
++ TC654_PWM_3467,
++ TC654_PWM_3933, /* default case - if V_in pin is open */
++ TC654_PWM_4400,
++ TC654_PWM_4867,
++ TC654_PWM_5333,
++ TC654_PWM_5800,
++ TC654_PWM_6267,
++ TC654_PWM_6733,
++ TC654_PWM_7200,
++ TC654_PWM_7667,
++ TC654_PWM_8133,
++ TC654_PWM_8600,
++ TC654_PWM_9067,
++ TC654_PWM_9533,
++ TC654_PWM_10000, /* sets fans to 100% duty cycle */
++};
++
++enum TC654_ALARMS {
++ TC654_ALARM_FAN1_FAULT,
++ TC654_ALARM_FAN2_FAULT,
++ TC654_ALARM_FAN1_COUNTER_OVERFLOW,
++ TC654_ALARM_FAN2_COUNTER_OVERFLOW,
++ TC654_ALARM_OVER_TEMPERATURE,
++
++ /* KEEP LAST */
++ __NUM_TC654_ALARMS,
++};
++
++static const struct pwm_table_entry {
++ u8 min;
++ enum TC654_FAN_MODE mode;
++} pwm_table[] = {
++ { 0, TC654_PWM_OFF },
++ { 1, TC654_PWM_3000 },
++ { 88, TC654_PWM_3467 },
++ {101, TC654_PWM_3933 },
++ {113, TC654_PWM_4400 },
++ {125, TC654_PWM_4867 },
++ {137, TC654_PWM_5333 },
++ {148, TC654_PWM_5800 },
++ {160, TC654_PWM_6267 },
++ {172, TC654_PWM_6733 },
++ {184, TC654_PWM_7200 },
++ {196, TC654_PWM_7667 },
++ {208, TC654_PWM_8133 },
++ {220, TC654_PWM_8600 },
++ {232, TC654_PWM_9067 },
++ {244, TC654_PWM_9533 },
++ {255, TC654_PWM_10000 },
++};
++
++/* driver context */
++struct tc654 {
++ struct i2c_client *client;
++
++ struct mutex update_lock;
++
++ unsigned long last_updated; /* in jiffies */
++ u8 cached_regs[__TC654_REG_NUM];
++
++ bool valid; /* monitored registers are valid */
++ u16 fan_input[__NUM_TC654_FAN];
++ bool alarms[__NUM_TC654_ALARMS];
++ bool vin_status;
++ bool pwm_manual;
++
++ /* optional cooling device */
++ struct thermal_cooling_device *cdev;
++};
++
++/* hardware accessors and functions */
++static int read_tc(struct tc654 *tc, u8 reg)
++{
++ s32 status;
++
++ if (reg <= TC654_REG_VER_ID) {
++ /* Table 6.1 states that all registers are readable */
++ status = i2c_smbus_read_byte_data(tc->client, reg);
++ } else
++ status = -EINVAL;
++
++ if (status < 0) {
++ dev_warn(&tc->client->dev, "can't read register 0x%02x due to error (%d)",
++ reg, status);
++ } else {
++ tc->cached_regs[reg] = status;
++ }
++
++ return status;
++}
++
++static int write_tc(struct tc654 *tc, u8 i2c_reg, u8 val)
++{
++ s32 status;
++
++ /*
++ * Table 6.1 states that both fan threshold registers,
++ * the Config and Duty Cycle are writeable.
++ */
++ switch (i2c_reg) {
++ case TC654_REG_FAN1_FAULT_THRESH:
++ case TC654_REG_FAN2_FAULT_THRESH:
++ case TC654_REG_DUTY_CYCLE:
++ case TC654_REG_CONFIG:
++ status = i2c_smbus_write_byte_data(tc->client, i2c_reg, val);
++ break;
++
++ default:
++ return -EINVAL;
++ }
++
++ if (status < 0) {
++ dev_warn(&tc->client->dev, "can't write register 0x%02x with value 0x%02x due to error (%d)",
++ i2c_reg, val, status);
++ } else {
++ tc->cached_regs[i2c_reg] = val;
++ }
++
++ return status;
++}
++
++static int mod_config(struct tc654 *tc, u8 set, u8 clear)
++{
++ u8 val = 0;
++
++ /* a bit can't be set and cleared on the same time. */
++ if (set & clear)
++ return -EINVAL;
++
++ /* invalidate data to force re-read from hardware */
++ tc->valid = false;
++ val = (tc->cached_regs[TC654_REG_CONFIG] | set) & (~clear);
++ return write_tc(tc, TC654_REG_CONFIG, val);
++}
++
++static int read_fan_rpm(struct tc654 *tc, enum TC654_FAN fan)
++{
++ int ret;
++
++ /* 6.1 RPM-OUTPUT1 and RPM-OUTPUT2 registers */
++ ret = read_tc(tc, fan == TC654_FAN1 ? TC654_REG_RPM1 : TC654_REG_RPM2);
++ if (ret < 0)
++ return ret;
++
++ /*
++ * The Resolution Selection Bit in 6.3 CONFIGURATION REGISTER
++ * is needed to convert the raw value to the RPM.
++ * 0 = RPM1 and RPM2 use (8-Bit) resolution => * 50 RPM
++ * 1 = RPM1 and RPM2 use (9-Bit) resolution => * 25 RPM
++ */
++ return ret * (25 <<
++ !(tc->cached_regs[TC654_REG_CONFIG] & TC654_CTRL_RES));
++}
++
++static int write_fan_fault_thresh(struct tc654 *tc, enum TC654_FAN fan,
++ u16 rpm)
++{
++ u8 converted_rpm;
++
++ if (rpm > 12750)
++ return -EINVAL;
++
++ /*
++ * 6.2 FAN_FAULT1 and FAN_FAULT2 Threshold registers
++ *
++ * Both registers operate in 50 RPM mode exclusively.
++ */
++ converted_rpm = rpm / 50;
++
++ /* invalidate data to force re-read from hardware */
++ tc->valid = false;
++ return write_tc(tc, fan == TC654_FAN1 ? TC654_REG_FAN1_FAULT_THRESH :
++ TC654_REG_FAN2_FAULT_THRESH, converted_rpm);
++}
++
++
++static int read_fan_fault_thresh(struct tc654 *tc, enum TC654_FAN fan)
++{
++ /*
++ * 6.2 FAN_FAULT1 and FAN_FAULT2 Threshold registers
++ *
++ * Both registers operate in 50 RPM mode exclusively.
++ */
++ return read_tc(tc, fan == TC654_FAN1 ? TC654_REG_FAN1_FAULT_THRESH :
++ TC654_REG_FAN2_FAULT_THRESH) * 50;
++}
++
++static enum TC654_FAN_MODE get_fan_mode(struct tc654 *tc)
++{
++ if (tc->cached_regs[TC654_REG_CONFIG] & TC654_CTRL_SDM) {
++ return TC654_PWM_OFF;
++ } else if (tc->cached_regs[TC654_REG_CONFIG] & TC654_CTRL_DUTYC) {
++ return TC654_PWM_3000 + tc->cached_regs[TC654_REG_DUTY_CYCLE];
++ } else if (tc->vin_status == 0)
++ return TC654_PWM_VIN;
++
++ return -EINVAL;
++}
++
++static int write_fan_mode(struct tc654 *tc, enum TC654_FAN_MODE mode)
++{
++ int err;
++ u8 pwm_mode;
++ bool in_sdm;
++
++ in_sdm = !!(tc->cached_regs[TC654_REG_CONFIG] &
++ TC654_CTRL_SDM);
++
++ switch (mode) {
++ case TC654_PWM_OFF:
++ if (in_sdm)
++ return 0;
++
++ /* Enter Shutdown Mode - Switches off all fans */
++ err = mod_config(tc, TC654_CTRL_SDM, TC654_CTRL_DUTYC);
++ if (err)
++ return err;
++
++ return 0;
++
++ case TC654_PWM_VIN:
++ if (tc->vin_status) {
++ dev_err(&tc->client->dev,
++ "V_in pin is open, can't enable automatic mode.");
++ return -EINVAL;
++ }
++
++ err = mod_config(tc, 0, TC654_CTRL_SDM | TC654_CTRL_DUTYC);
++ if (err)
++ return err;
++
++ tc->pwm_manual = false;
++ return 0;
++
++ case TC654_PWM_3000:
++ case TC654_PWM_3467:
++ case TC654_PWM_3933:
++ case TC654_PWM_4400:
++ case TC654_PWM_4867:
++ case TC654_PWM_5333:
++ case TC654_PWM_5800:
++ case TC654_PWM_6267:
++ case TC654_PWM_6733:
++ case TC654_PWM_7200:
++ case TC654_PWM_7667:
++ case TC654_PWM_8133:
++ case TC654_PWM_8600:
++ case TC654_PWM_9067:
++ case TC654_PWM_9533:
++ case TC654_PWM_10000:
++ pwm_mode = mode - TC654_PWM_3000;
++ if (!in_sdm) {
++ err = write_tc(tc, TC654_REG_DUTY_CYCLE, pwm_mode);
++ if (err)
++ return err;
++ }
++
++ err = mod_config(tc, TC654_CTRL_DUTYC, TC654_CTRL_SDM);
++ if (err)
++ return err;
++
++ tc->pwm_manual = true;
++
++ if (in_sdm) {
++ /*
++ * In case the TC654/TC655 was in SDM mode, the write
++ * above into the TC654_REG_DUTY_CYCLE register will
++ * have no effect because the chip was switched off.
++ *
++ * Note: The TC654/TC655 have a special "power-on"
++ * feature where the PWM will be forced to 100% for
++ * one full second in order to spin-up a resting fan.
++ */
++ err = write_tc(tc, TC654_REG_DUTY_CYCLE, pwm_mode);
++ if (err)
++ return err;
++ }
++
++ return 0;
++
++ default:
++ return -EINVAL;
++ }
++}
++
++static struct tc654 *tc654_update_device(struct device *dev)
++{
++ struct tc654 *tc = dev_get_drvdata(dev);
++
++ mutex_lock(&tc->update_lock);
++
++ /*
++ * In Chapter "1.0 Electrical Characteristics",
++ * the "Fault Output Response Time" is specified as 2.4 seconds.
++ */
++ if (time_after(jiffies, tc->last_updated + 2 * HZ + (HZ * 2) / 5)
++ || !tc->valid) {
++ size_t i;
++ int ret;
++ bool alarm_triggered;
++
++ tc->valid = false;
++
++ for (i = 0; i < __NUM_TC654_FAN; i++) {
++ ret = read_fan_rpm(tc, i);
++ if (ret < 0)
++ goto out;
++
++ tc->fan_input[i] = ret;
++ }
++
++ ret = read_tc(tc, TC654_REG_STATUS);
++ if (ret < 0)
++ goto out;
++
++ alarm_triggered = !!(ret & (TC654_STATUS_F1F |
++ TC654_STATUS_F2F | TC654_STATUS_R1CO |
++ TC654_STATUS_R2CO | TC654_STATUS_OTF));
++
++ tc->alarms[TC654_ALARM_FAN1_FAULT] = !!(ret & TC654_STATUS_F1F);
++ tc->alarms[TC654_ALARM_FAN2_FAULT] = !!(ret & TC654_STATUS_F2F);
++ tc->alarms[TC654_ALARM_FAN1_COUNTER_OVERFLOW] =
++ !!(ret & TC654_STATUS_R1CO);
++ tc->alarms[TC654_ALARM_FAN2_COUNTER_OVERFLOW] =
++ !!(ret & TC654_STATUS_R2CO);
++ tc->alarms[TC654_ALARM_OVER_TEMPERATURE] =
++ !!(ret & TC654_STATUS_OTF);
++ tc->vin_status = !!(ret & TC654_STATUS_VSTAT);
++
++ /*
++ * From 4.5 and 6.3
++ *
++ * ... "If the V_in pin is open when TC654_CTRL_DUTYC is not
++ * selected, then V_out duty cycle will default to 39.33%.".
++ *
++ * and most importantly 6.5:
++ * ... "V_in pin is open, the duty cycle will go to the default
++ * setting of this register, which is 0010 (39.33%)."
++ */
++ tc->pwm_manual |= tc->vin_status &&
++ (tc->cached_regs[TC654_REG_CONFIG] &
++ TC654_CTRL_DUTYC);
++
++ if (alarm_triggered) {
++ /*
++ * as the name implies, this FLAG needs to be
++ * set in order to clear the FAN Fault error.
++ */
++ ret = mod_config(tc, TC654_CTRL_FFCLR, 0);
++ if (ret < 0)
++ goto out;
++ }
++
++ tc->last_updated = jiffies;
++ tc->valid = true;
++ }
++
++out:
++ mutex_unlock(&tc->update_lock);
++ return tc;
++}
++
++static u8 get_fan_pulse(struct tc654 *tc, enum TC654_FAN fan)
++{
++ u8 fan_pulse_mask = fan == TC654_FAN1 ?
++ TC654_CTRL_F1PPR_M : TC654_CTRL_F2PPR_M;
++ u8 fan_pulse_shift = fan == TC654_FAN1 ?
++ TC654_CTRL_F1PPR_S : TC654_CTRL_F2PPR_S;
++
++ return 1 << ((tc->cached_regs[TC654_REG_CONFIG] & fan_pulse_mask) >>
++ fan_pulse_shift);
++}
++
++static int
++set_fan_pulse(struct tc654 *tc, enum TC654_FAN fan, int pulses)
++{
++ int old_pulses;
++ int err;
++ u8 new_pulse_per_rotation;
++ u8 fan_pulse_mask = fan == TC654_FAN1 ?
++ TC654_CTRL_F1PPR_M : TC654_CTRL_F2PPR_M;
++ u8 fan_pulse_shift = fan == TC654_FAN1 ?
++ TC654_CTRL_F1PPR_S : TC654_CTRL_F2PPR_S;
++
++ switch (pulses) {
++ case 1:
++ new_pulse_per_rotation = 0;
++ break;
++ case 2:
++ new_pulse_per_rotation = 1;
++ break;
++ case 4:
++ new_pulse_per_rotation = 2;
++ break;
++ case 8:
++ new_pulse_per_rotation = 3;
++ break;
++ default:
++ return -EINVAL;
++ }
++
++ new_pulse_per_rotation <<= fan_pulse_shift;
++ new_pulse_per_rotation &= fan_pulse_mask;
++
++ old_pulses = tc->cached_regs[TC654_REG_CONFIG];
++ old_pulses &= fan_pulse_mask;
++
++ if (new_pulse_per_rotation == old_pulses)
++ return 0;
++
++ mutex_lock(&tc->update_lock);
++ err = mod_config(tc, new_pulse_per_rotation,
++ old_pulses & (~new_pulse_per_rotation));
++ mutex_unlock(&tc->update_lock);
++
++ /* invalidate RPM data to force re-read from hardware */
++ tc->valid = false;
++
++ return err;
++}
++
++static int get_fan_speed(struct tc654 *tc)
++{
++ enum TC654_FAN_MODE mode;
++ size_t i;
++
++ mode = get_fan_mode(tc);
++ for (i = 0; i < ARRAY_SIZE(pwm_table); i++) {
++ if (mode == pwm_table[i].mode)
++ return pwm_table[i].min;
++ }
++
++ return -EINVAL;
++}
++
++static int set_fan_speed(struct tc654 *tc, int new_value)
++{
++ int result;
++ size_t i;
++
++ if (new_value > pwm_table[ARRAY_SIZE(pwm_table) - 1].min ||
++ new_value < pwm_table[0].min)
++ return -EINVAL;
++
++ for (i = 0; i < ARRAY_SIZE(pwm_table); i++) {
++ /* exact match */
++ if (pwm_table[i].min == new_value)
++ break;
++
++ /* a little bit too big - go with the previous entry */
++ if (pwm_table[i].min > new_value) {
++ --i;
++ break;
++ }
++ }
++
++ mutex_lock(&tc->update_lock);
++ result = write_fan_mode(tc, pwm_table[i].mode);
++ mutex_unlock(&tc->update_lock);
++ if (result < 0)
++ return result;
++
++ return 0;
++}
++
++/* sysfs */
++
++static ssize_t
++show_fan_input(struct device *dev, struct device_attribute *da, char *buf)
++{
++ struct tc654 *tc = tc654_update_device(dev);
++ int nr = to_sensor_dev_attr(da)->index;
++
++ return sprintf(buf, "%d\n", tc->fan_input[nr]);
++}
++
++static ssize_t
++show_fan_min(struct device *dev, struct device_attribute *da, char *buf)
++{
++ struct tc654 *tc = dev_get_drvdata(dev);
++ int nr = to_sensor_dev_attr(da)->index;
++
++ return sprintf(buf, "%d\n", read_fan_fault_thresh(tc, nr));
++}
++
++static ssize_t
++show_fan_min_alarm(struct device *dev, struct device_attribute *da, char *buf)
++{
++ struct tc654 *tc = tc654_update_device(dev);
++ int nr = to_sensor_dev_attr(da)->index;
++
++ return sprintf(buf, "%d\n", nr == TC654_FAN1 ?
++ tc->alarms[TC654_ALARM_FAN1_FAULT] :
++ tc->alarms[TC654_ALARM_FAN2_FAULT]);
++}
++
++static ssize_t
++show_fan_max_alarm(struct device *dev, struct device_attribute *da, char *buf)
++{
++ struct tc654 *tc = tc654_update_device(dev);
++ int nr = to_sensor_dev_attr(da)->index;
++
++ return sprintf(buf, "%d\n", nr == TC654_FAN1 ?
++ tc->alarms[TC654_ALARM_FAN1_COUNTER_OVERFLOW] :
++ tc->alarms[TC654_ALARM_FAN2_COUNTER_OVERFLOW]);
++}
++
++static ssize_t
++set_fan_min(struct device *dev, struct device_attribute *da,
++ const char *buf, size_t count)
++{
++ struct tc654 *tc = dev_get_drvdata(dev);
++ long new_min;
++ int nr = to_sensor_dev_attr(da)->index;
++ int old_min = read_fan_fault_thresh(tc, nr);
++ int status = kstrtol(buf, 10, &new_min);
++
++ if (status < 0)
++ return status;
++
++ new_min = (new_min / 50) * 50;
++ if (new_min == old_min) /* No change */
++ return count;
++
++ if (new_min < 0 || new_min > 12750)
++ return -EINVAL;
++
++ mutex_lock(&tc->update_lock);
++ status = write_fan_fault_thresh(tc, nr, new_min);
++ mutex_unlock(&tc->update_lock);
++ return count;
++}
++
++static ssize_t
++show_fan_max(struct device *dev, struct device_attribute *da, char *buf)
++{
++ struct tc654 *tc = dev_get_drvdata(dev);
++ int max_rpm = tc->cached_regs[TC654_REG_CONFIG] & TC654_CTRL_RES ?
++ (((1 << 9) - 1) * 25) /* ((2**9) - 1) * 25 RPM */:
++ (((1 << 8) - 1) * 50) /* ((2**8) - 1) * 50 RPM */;
++
++ return sprintf(buf, "%d\n", max_rpm);
++}
++
++static ssize_t
++show_fan_fault(struct device *dev, struct device_attribute *da, char *buf)
++{
++ struct tc654 *tc = tc654_update_device(dev);
++ int nr = to_sensor_dev_attr(da)->index;
++ u8 fan_fault_mask = nr == TC654_FAN1 ?
++ TC654_STATUS_F1F : TC654_STATUS_F2F;
++
++ return sprintf(buf, "%d\n",
++ !!(tc->cached_regs[TC654_REG_STATUS] & fan_fault_mask));
++}
++
++static ssize_t
++show_fan_pulses(struct device *dev, struct device_attribute *da, char *buf)
++{
++ struct tc654 *tc = dev_get_drvdata(dev);
++ int nr = to_sensor_dev_attr(da)->index;
++
++ return sprintf(buf, "%d\n", get_fan_pulse(tc, nr));
++}
++
++static ssize_t
++set_fan_pulses(struct device *dev, struct device_attribute *da,
++ const char *buf, size_t count)
++{
++ struct tc654 *tc = dev_get_drvdata(dev);
++ long new_pulse;
++ int nr = to_sensor_dev_attr(da)->index;
++ int status = kstrtol(buf, 10, &new_pulse);
++
++ if (status < 0)
++ return status;
++
++ status = set_fan_pulse(tc, nr, new_pulse);
++ if (status < 0)
++ return status;
++
++ return count;
++}
++
++static ssize_t
++show_pwm_enable(struct device *dev, struct device_attribute *da, char *buf)
++{
++ struct tc654 *tc = tc654_update_device(dev);
++ int pwm_enabled;
++
++ if ((tc->cached_regs[TC654_REG_CONFIG] & TC654_CTRL_SDM) &&
++ !tc->pwm_manual) {
++ pwm_enabled = 0; /* full off */
++ } else {
++ if (tc->valid && tc->vin_status == 0)
++ pwm_enabled = 2; /* automatic fan speed control */
++
++ pwm_enabled = 1; /* PWM Mode */
++ }
++
++ return sprintf(buf, "%d\n", pwm_enabled);
++}
++
++static ssize_t
++set_pwm_enable(struct device *dev, struct device_attribute *da,
++ const char *buf, size_t count)
++{
++ struct tc654 *tc = dev_get_drvdata(dev);
++ long new_value;
++
++ int result = kstrtol(buf, 10, &new_value);
++
++ if (result < 0)
++ return result;
++
++ mutex_lock(&tc->update_lock);
++ switch (new_value) {
++ case 0: /* no fan control (i.e. is OFF) */
++ result = write_fan_mode(tc, TC654_PWM_OFF);
++ tc->pwm_manual = false;
++ break;
++
++ case 1: /* manual fan control enabled (using pwm) */
++ result = write_fan_mode(tc, TC654_PWM_10000);
++ break;
++
++ case 2: /* automatic fan speed control enabled */
++ result = write_fan_mode(tc, TC654_PWM_VIN);
++ break;
++
++ default:
++ result = -EINVAL;
++ }
++
++ mutex_unlock(&tc->update_lock);
++ return result < 0 ? result : count;
++}
++
++static ssize_t
++show_pwm(struct device *dev, struct device_attribute *da, char *buf)
++{
++ struct tc654 *tc = tc654_update_device(dev);
++ int ret;
++
++ ret = get_fan_speed(tc);
++ if (ret < 0)
++ return ret;
++
++ return sprintf(buf, "%d\n", ret);
++}
++
++static ssize_t
++set_pwm(struct device *dev, struct device_attribute *da,
++ const char *buf, size_t count)
++{
++ struct tc654 *tc = dev_get_drvdata(dev);
++ long new_value = -1;
++ int result = kstrtol(buf, 10, &new_value);
++
++ if (result < 0)
++ return result;
++
++ if (new_value < 0 || new_value > INT_MAX)
++ return -EINVAL;
++
++ if (!tc->pwm_manual)
++ return -EINVAL;
++
++ result = set_fan_speed(tc, new_value);
++ if (result < 0)
++ return result;
++
++ return count;
++}
++
++static ssize_t
++show_temp_alarm_otf(struct device *dev, struct device_attribute *da, char *buf)
++{
++ struct tc654 *tc = tc654_update_device(dev);
++
++ return sprintf(buf, "%d\n", tc->alarms[TC654_ALARM_OVER_TEMPERATURE]);
++}
++
++static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input,
++ NULL, TC654_FAN1);
++static SENSOR_DEVICE_ATTR(fan1_min, S_IRUGO | S_IWUSR, show_fan_min,
++ set_fan_min, TC654_FAN1);
++static SENSOR_DEVICE_ATTR(fan1_min_alarm, S_IRUGO, show_fan_min_alarm,
++ NULL, TC654_FAN1);
++static SENSOR_DEVICE_ATTR(fan1_max_alarm, S_IRUGO, show_fan_max_alarm,
++ NULL, TC654_FAN1);
++static SENSOR_DEVICE_ATTR(fan1_max, S_IRUGO, show_fan_max, NULL, TC654_FAN1);
++static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, show_fan_fault,
++ NULL, TC654_FAN1);
++static SENSOR_DEVICE_ATTR(fan1_pulses, S_IRUGO | S_IWUSR, show_fan_pulses,
++ set_fan_pulses, TC654_FAN1);
++static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input,
++ NULL, TC654_FAN2);
++static SENSOR_DEVICE_ATTR(fan2_min, S_IRUGO | S_IWUSR, show_fan_min,
++ set_fan_min, TC654_FAN2);
++static SENSOR_DEVICE_ATTR(fan2_max, S_IRUGO, show_fan_max,
++ NULL, TC654_FAN2);
++static SENSOR_DEVICE_ATTR(fan2_min_alarm, S_IRUGO, show_fan_min_alarm,
++ NULL, TC654_FAN2);
++static SENSOR_DEVICE_ATTR(fan2_max_alarm, S_IRUGO, show_fan_max_alarm,
++ NULL, TC654_FAN2);
++static SENSOR_DEVICE_ATTR(fan2_fault, S_IRUGO, show_fan_fault,
++ NULL, TC654_FAN2);
++static SENSOR_DEVICE_ATTR(fan2_pulses, S_IRUGO | S_IWUSR, show_fan_pulses,
++ set_fan_pulses, TC654_FAN2);
++
++static DEVICE_ATTR(pwm1_enable, S_IRUGO | S_IWUSR, show_pwm_enable,
++ set_pwm_enable);
++static DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_pwm, set_pwm);
++
++static DEVICE_ATTR(temp1_emergency_alarm, S_IRUGO, show_temp_alarm_otf, NULL);
++
++/* sensors present on all models */
++static struct attribute *tc654_attrs[] = {
++ &sensor_dev_attr_fan1_input.dev_attr.attr,
++ &sensor_dev_attr_fan1_min.dev_attr.attr,
++ &sensor_dev_attr_fan1_max.dev_attr.attr,
++ &sensor_dev_attr_fan1_min_alarm.dev_attr.attr,
++ &sensor_dev_attr_fan1_max_alarm.dev_attr.attr,
++ &sensor_dev_attr_fan1_fault.dev_attr.attr,
++ &sensor_dev_attr_fan1_pulses.dev_attr.attr,
++ &sensor_dev_attr_fan2_input.dev_attr.attr,
++ &sensor_dev_attr_fan2_min.dev_attr.attr,
++ &sensor_dev_attr_fan2_max.dev_attr.attr,
++ &sensor_dev_attr_fan2_min_alarm.dev_attr.attr,
++ &sensor_dev_attr_fan2_max_alarm.dev_attr.attr,
++ &sensor_dev_attr_fan2_fault.dev_attr.attr,
++ &sensor_dev_attr_fan2_pulses.dev_attr.attr,
++
++ &dev_attr_pwm1_enable.attr,
++ &dev_attr_pwm1.attr,
++
++ &dev_attr_temp1_emergency_alarm.attr,
++ NULL
++};
++
++ATTRIBUTE_GROUPS(tc654);
++
++/* cooling device */
++
++static int tc654_get_max_state(struct thermal_cooling_device *cdev,
++ unsigned long *state)
++{
++ *state = 255;
++ return 0;
++}
++
++static int tc654_get_cur_state(struct thermal_cooling_device *cdev,
++ unsigned long *state)
++{
++ struct tc654 *tc = cdev->devdata;
++ int ret;
++
++ if (!tc)
++ return -EINVAL;
++
++ ret = get_fan_speed(tc);
++ if (ret < 0)
++ return ret;
++
++ *state = ret;
++ return 0;
++}
++
++static int tc654_set_cur_state(struct thermal_cooling_device *cdev,
++ unsigned long state)
++{
++ struct tc654 *tc = cdev->devdata;
++
++ if (!tc)
++ return -EINVAL;
++
++ if (state > INT_MAX)
++ return -EINVAL;
++
++ return set_fan_speed(tc, state);
++}
++
++static const struct thermal_cooling_device_ops tc654_fan_cool_ops = {
++ .get_max_state = tc654_get_max_state,
++ .get_cur_state = tc654_get_cur_state,
++ .set_cur_state = tc654_set_cur_state,
++};
++
++
++/* hardware probe and detection */
++
++static int
++tc654_probe(struct i2c_client *client, const struct i2c_device_id *id)
++{
++ struct tc654 *tc;
++ struct device *hwmon_dev;
++ int ret, i;
++
++ if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
++ return -EIO;
++
++ tc = devm_kzalloc(&client->dev, sizeof(*tc), GFP_KERNEL);
++ if (!tc)
++ return -ENOMEM;
++
++ i2c_set_clientdata(client, tc);
++ tc->client = client;
++ mutex_init(&tc->update_lock);
++
++ /* cache all 8 registers */
++ for (i = 0; i < __TC654_REG_NUM; i++) {
++ ret = read_tc(tc, i);
++ if (ret < 0)
++ return ret;
++ }
++
++ /* sysfs hooks */
++ hwmon_dev = devm_hwmon_device_register_with_groups(&client->dev,
++ client->name, tc,
++ tc654_groups);
++ if (IS_ERR(hwmon_dev))
++ return PTR_ERR(hwmon_dev);
++
++#if IS_ENABLED(CONFIG_OF)
++ /* Optional cooling device register for Device tree platforms */
++ tc->cdev = thermal_of_cooling_device_register(client->dev.of_node,
++ "tc654", tc,
++ &tc654_fan_cool_ops);
++#else /* CONFIG_OF */
++ /* Optional cooling device register for non Device tree platforms */
++ tc->cdev = thermal_cooling_device_register("tc654", tc,
++ &tc654_fan_cool_ops);
++#endif /* CONFIG_OF */
++
++ dev_info(&client->dev, "%s: sensor '%s'\n",
++ dev_name(hwmon_dev), client->name);
++
++ return 0;
++}
++
++static const struct i2c_device_id tc654_ids[] = {
++ { "tc654", 0, },
++ { }
++};
++MODULE_DEVICE_TABLE(i2c, tc654_ids);
++
++/* Return 0 if detection is successful, -ENODEV otherwise */
++static int
++tc654_detect(struct i2c_client *new_client, struct i2c_board_info *info)
++{
++ struct i2c_adapter *adapter = new_client->adapter;
++ int manufacturer, product;
++
++ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
++ return -ENODEV;
++
++ manufacturer = i2c_smbus_read_byte_data(new_client, TC654_REG_MFR_ID);
++ if (manufacturer != TC654_MFR_ID_MICROCHIP)
++ return -ENODEV;
++
++ product = i2c_smbus_read_byte_data(new_client, TC654_REG_VER_ID);
++ if (!((product == TC654_VER_ID) || (product == TC655_VER_ID)))
++ return -ENODEV;
++
++ strlcpy(info->type, "tc654", I2C_NAME_SIZE);
++ return 0;
++}
++
++static struct i2c_driver tc654_driver = {
++ .class = I2C_CLASS_HWMON,
++ .driver = {
++ .name = "tc654",
++ },
++ .probe = tc654_probe,
++ .id_table = tc654_ids,
++ .detect = tc654_detect,
++ .address_list = normal_i2c,
++};
++
++module_i2c_driver(tc654_driver);
++
++MODULE_AUTHOR("Christian Lamparter <chunkeey@gmail.com>");
++MODULE_DESCRIPTION("Microchip TC654/TC655 hwmon driver");
++MODULE_LICENSE("GPL");
projects / openwrt / openwrt.git / commitdiff