162306a36Sopenharmony_ci// SPDX-License-Identifier: GPL-2.0-or-later 262306a36Sopenharmony_ci/* 362306a36Sopenharmony_ci * max6650.c - Part of lm_sensors, Linux kernel modules for hardware 462306a36Sopenharmony_ci * monitoring. 562306a36Sopenharmony_ci * 662306a36Sopenharmony_ci * (C) 2007 by Hans J. Koch <hjk@hansjkoch.de> 762306a36Sopenharmony_ci * 862306a36Sopenharmony_ci * based on code written by John Morris <john.morris@spirentcom.com> 962306a36Sopenharmony_ci * Copyright (c) 2003 Spirent Communications 1062306a36Sopenharmony_ci * and Claus Gindhart <claus.gindhart@kontron.com> 1162306a36Sopenharmony_ci * 1262306a36Sopenharmony_ci * This module has only been tested with the MAX6650 chip. It should 1362306a36Sopenharmony_ci * also work with the MAX6651. It does not distinguish max6650 and max6651 1462306a36Sopenharmony_ci * chips. 1562306a36Sopenharmony_ci * 1662306a36Sopenharmony_ci * The datasheet was last seen at: 1762306a36Sopenharmony_ci * 1862306a36Sopenharmony_ci * http://pdfserv.maxim-ic.com/en/ds/MAX6650-MAX6651.pdf 1962306a36Sopenharmony_ci */ 2062306a36Sopenharmony_ci 2162306a36Sopenharmony_ci#include <linux/module.h> 2262306a36Sopenharmony_ci#include <linux/init.h> 2362306a36Sopenharmony_ci#include <linux/slab.h> 2462306a36Sopenharmony_ci#include <linux/jiffies.h> 2562306a36Sopenharmony_ci#include <linux/i2c.h> 2662306a36Sopenharmony_ci#include <linux/hwmon.h> 2762306a36Sopenharmony_ci#include <linux/hwmon-sysfs.h> 2862306a36Sopenharmony_ci#include <linux/err.h> 2962306a36Sopenharmony_ci#include <linux/of_device.h> 3062306a36Sopenharmony_ci#include <linux/thermal.h> 3162306a36Sopenharmony_ci 3262306a36Sopenharmony_ci/* 3362306a36Sopenharmony_ci * Insmod parameters 3462306a36Sopenharmony_ci */ 3562306a36Sopenharmony_ci 3662306a36Sopenharmony_ci/* fan_voltage: 5=5V fan, 12=12V fan, 0=don't change */ 3762306a36Sopenharmony_cistatic int fan_voltage; 3862306a36Sopenharmony_ci/* prescaler: Possible values are 1, 2, 4, 8, 16 or 0 for don't change */ 3962306a36Sopenharmony_cistatic int prescaler; 4062306a36Sopenharmony_ci/* clock: The clock frequency of the chip (max6651 can be clocked externally) */ 4162306a36Sopenharmony_cistatic int clock = 254000; 4262306a36Sopenharmony_ci 4362306a36Sopenharmony_cimodule_param(fan_voltage, int, 0444); 4462306a36Sopenharmony_cimodule_param(prescaler, int, 0444); 4562306a36Sopenharmony_cimodule_param(clock, int, 0444); 4662306a36Sopenharmony_ci 4762306a36Sopenharmony_ci/* 4862306a36Sopenharmony_ci * MAX 6650/6651 registers 4962306a36Sopenharmony_ci */ 5062306a36Sopenharmony_ci 5162306a36Sopenharmony_ci#define MAX6650_REG_SPEED 0x00 5262306a36Sopenharmony_ci#define MAX6650_REG_CONFIG 0x02 5362306a36Sopenharmony_ci#define MAX6650_REG_GPIO_DEF 0x04 5462306a36Sopenharmony_ci#define MAX6650_REG_DAC 0x06 5562306a36Sopenharmony_ci#define MAX6650_REG_ALARM_EN 0x08 5662306a36Sopenharmony_ci#define MAX6650_REG_ALARM 0x0A 5762306a36Sopenharmony_ci#define MAX6650_REG_TACH0 0x0C 5862306a36Sopenharmony_ci#define MAX6650_REG_TACH1 0x0E 5962306a36Sopenharmony_ci#define MAX6650_REG_TACH2 0x10 6062306a36Sopenharmony_ci#define MAX6650_REG_TACH3 0x12 6162306a36Sopenharmony_ci#define MAX6650_REG_GPIO_STAT 0x14 6262306a36Sopenharmony_ci#define MAX6650_REG_COUNT 0x16 6362306a36Sopenharmony_ci 6462306a36Sopenharmony_ci/* 6562306a36Sopenharmony_ci * Config register bits 6662306a36Sopenharmony_ci */ 6762306a36Sopenharmony_ci 6862306a36Sopenharmony_ci#define MAX6650_CFG_V12 0x08 6962306a36Sopenharmony_ci#define MAX6650_CFG_PRESCALER_MASK 0x07 7062306a36Sopenharmony_ci#define MAX6650_CFG_PRESCALER_2 0x01 7162306a36Sopenharmony_ci#define MAX6650_CFG_PRESCALER_4 0x02 7262306a36Sopenharmony_ci#define MAX6650_CFG_PRESCALER_8 0x03 7362306a36Sopenharmony_ci#define MAX6650_CFG_PRESCALER_16 0x04 7462306a36Sopenharmony_ci#define MAX6650_CFG_MODE_MASK 0x30 7562306a36Sopenharmony_ci#define MAX6650_CFG_MODE_ON 0x00 7662306a36Sopenharmony_ci#define MAX6650_CFG_MODE_OFF 0x10 7762306a36Sopenharmony_ci#define MAX6650_CFG_MODE_CLOSED_LOOP 0x20 7862306a36Sopenharmony_ci#define MAX6650_CFG_MODE_OPEN_LOOP 0x30 7962306a36Sopenharmony_ci#define MAX6650_COUNT_MASK 0x03 8062306a36Sopenharmony_ci 8162306a36Sopenharmony_ci/* 8262306a36Sopenharmony_ci * Alarm status register bits 8362306a36Sopenharmony_ci */ 8462306a36Sopenharmony_ci 8562306a36Sopenharmony_ci#define MAX6650_ALRM_MAX 0x01 8662306a36Sopenharmony_ci#define MAX6650_ALRM_MIN 0x02 8762306a36Sopenharmony_ci#define MAX6650_ALRM_TACH 0x04 8862306a36Sopenharmony_ci#define MAX6650_ALRM_GPIO1 0x08 8962306a36Sopenharmony_ci#define MAX6650_ALRM_GPIO2 0x10 9062306a36Sopenharmony_ci 9162306a36Sopenharmony_ci/* Minimum and maximum values of the FAN-RPM */ 9262306a36Sopenharmony_ci#define FAN_RPM_MIN 240 9362306a36Sopenharmony_ci#define FAN_RPM_MAX 30000 9462306a36Sopenharmony_ci 9562306a36Sopenharmony_ci#define DIV_FROM_REG(reg) (1 << ((reg) & 7)) 9662306a36Sopenharmony_ci#define DAC_LIMIT(v12) ((v12) ? 180 : 76) 9762306a36Sopenharmony_ci 9862306a36Sopenharmony_ci/* 9962306a36Sopenharmony_ci * Client data (each client gets its own) 10062306a36Sopenharmony_ci */ 10162306a36Sopenharmony_ci 10262306a36Sopenharmony_cistruct max6650_data { 10362306a36Sopenharmony_ci struct i2c_client *client; 10462306a36Sopenharmony_ci struct mutex update_lock; /* protect alarm register updates */ 10562306a36Sopenharmony_ci int nr_fans; 10662306a36Sopenharmony_ci bool valid; /* false until following fields are valid */ 10762306a36Sopenharmony_ci unsigned long last_updated; /* in jiffies */ 10862306a36Sopenharmony_ci 10962306a36Sopenharmony_ci /* register values */ 11062306a36Sopenharmony_ci u8 speed; 11162306a36Sopenharmony_ci u8 config; 11262306a36Sopenharmony_ci u8 tach[4]; 11362306a36Sopenharmony_ci u8 count; 11462306a36Sopenharmony_ci u8 dac; 11562306a36Sopenharmony_ci u8 alarm; 11662306a36Sopenharmony_ci u8 alarm_en; 11762306a36Sopenharmony_ci unsigned long cooling_dev_state; 11862306a36Sopenharmony_ci}; 11962306a36Sopenharmony_ci 12062306a36Sopenharmony_cistatic const u8 tach_reg[] = { 12162306a36Sopenharmony_ci MAX6650_REG_TACH0, 12262306a36Sopenharmony_ci MAX6650_REG_TACH1, 12362306a36Sopenharmony_ci MAX6650_REG_TACH2, 12462306a36Sopenharmony_ci MAX6650_REG_TACH3, 12562306a36Sopenharmony_ci}; 12662306a36Sopenharmony_ci 12762306a36Sopenharmony_cistatic const struct of_device_id __maybe_unused max6650_dt_match[] = { 12862306a36Sopenharmony_ci { 12962306a36Sopenharmony_ci .compatible = "maxim,max6650", 13062306a36Sopenharmony_ci .data = (void *)1 13162306a36Sopenharmony_ci }, 13262306a36Sopenharmony_ci { 13362306a36Sopenharmony_ci .compatible = "maxim,max6651", 13462306a36Sopenharmony_ci .data = (void *)4 13562306a36Sopenharmony_ci }, 13662306a36Sopenharmony_ci { }, 13762306a36Sopenharmony_ci}; 13862306a36Sopenharmony_ciMODULE_DEVICE_TABLE(of, max6650_dt_match); 13962306a36Sopenharmony_ci 14062306a36Sopenharmony_cistatic int dac_to_pwm(int dac, bool v12) 14162306a36Sopenharmony_ci{ 14262306a36Sopenharmony_ci /* 14362306a36Sopenharmony_ci * Useful range for dac is 0-180 for 12V fans and 0-76 for 5V fans. 14462306a36Sopenharmony_ci * Lower DAC values mean higher speeds. 14562306a36Sopenharmony_ci */ 14662306a36Sopenharmony_ci return clamp_val(255 - (255 * dac) / DAC_LIMIT(v12), 0, 255); 14762306a36Sopenharmony_ci} 14862306a36Sopenharmony_ci 14962306a36Sopenharmony_cistatic u8 pwm_to_dac(unsigned int pwm, bool v12) 15062306a36Sopenharmony_ci{ 15162306a36Sopenharmony_ci int limit = DAC_LIMIT(v12); 15262306a36Sopenharmony_ci 15362306a36Sopenharmony_ci return limit - (limit * pwm) / 255; 15462306a36Sopenharmony_ci} 15562306a36Sopenharmony_ci 15662306a36Sopenharmony_cistatic struct max6650_data *max6650_update_device(struct device *dev) 15762306a36Sopenharmony_ci{ 15862306a36Sopenharmony_ci struct max6650_data *data = dev_get_drvdata(dev); 15962306a36Sopenharmony_ci struct i2c_client *client = data->client; 16062306a36Sopenharmony_ci int reg, err = 0; 16162306a36Sopenharmony_ci int i; 16262306a36Sopenharmony_ci 16362306a36Sopenharmony_ci mutex_lock(&data->update_lock); 16462306a36Sopenharmony_ci 16562306a36Sopenharmony_ci if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { 16662306a36Sopenharmony_ci for (i = 0; i < data->nr_fans; i++) { 16762306a36Sopenharmony_ci reg = i2c_smbus_read_byte_data(client, tach_reg[i]); 16862306a36Sopenharmony_ci if (reg < 0) { 16962306a36Sopenharmony_ci err = reg; 17062306a36Sopenharmony_ci goto error; 17162306a36Sopenharmony_ci } 17262306a36Sopenharmony_ci data->tach[i] = reg; 17362306a36Sopenharmony_ci } 17462306a36Sopenharmony_ci 17562306a36Sopenharmony_ci /* 17662306a36Sopenharmony_ci * Alarms are cleared on read in case the condition that 17762306a36Sopenharmony_ci * caused the alarm is removed. Keep the value latched here 17862306a36Sopenharmony_ci * for providing the register through different alarm files. 17962306a36Sopenharmony_ci */ 18062306a36Sopenharmony_ci reg = i2c_smbus_read_byte_data(client, MAX6650_REG_ALARM); 18162306a36Sopenharmony_ci if (reg < 0) { 18262306a36Sopenharmony_ci err = reg; 18362306a36Sopenharmony_ci goto error; 18462306a36Sopenharmony_ci } 18562306a36Sopenharmony_ci data->alarm |= reg; 18662306a36Sopenharmony_ci data->last_updated = jiffies; 18762306a36Sopenharmony_ci data->valid = true; 18862306a36Sopenharmony_ci } 18962306a36Sopenharmony_ci 19062306a36Sopenharmony_cierror: 19162306a36Sopenharmony_ci mutex_unlock(&data->update_lock); 19262306a36Sopenharmony_ci if (err) 19362306a36Sopenharmony_ci data = ERR_PTR(err); 19462306a36Sopenharmony_ci return data; 19562306a36Sopenharmony_ci} 19662306a36Sopenharmony_ci 19762306a36Sopenharmony_ci/* 19862306a36Sopenharmony_ci * Change the operating mode of the chip (if needed). 19962306a36Sopenharmony_ci * mode is one of the MAX6650_CFG_MODE_* values. 20062306a36Sopenharmony_ci */ 20162306a36Sopenharmony_cistatic int max6650_set_operating_mode(struct max6650_data *data, u8 mode) 20262306a36Sopenharmony_ci{ 20362306a36Sopenharmony_ci int result; 20462306a36Sopenharmony_ci u8 config = data->config; 20562306a36Sopenharmony_ci 20662306a36Sopenharmony_ci if (mode == (config & MAX6650_CFG_MODE_MASK)) 20762306a36Sopenharmony_ci return 0; 20862306a36Sopenharmony_ci 20962306a36Sopenharmony_ci config = (config & ~MAX6650_CFG_MODE_MASK) | mode; 21062306a36Sopenharmony_ci 21162306a36Sopenharmony_ci result = i2c_smbus_write_byte_data(data->client, MAX6650_REG_CONFIG, 21262306a36Sopenharmony_ci config); 21362306a36Sopenharmony_ci if (result < 0) 21462306a36Sopenharmony_ci return result; 21562306a36Sopenharmony_ci 21662306a36Sopenharmony_ci data->config = config; 21762306a36Sopenharmony_ci 21862306a36Sopenharmony_ci return 0; 21962306a36Sopenharmony_ci} 22062306a36Sopenharmony_ci 22162306a36Sopenharmony_ci/* 22262306a36Sopenharmony_ci * Set the fan speed to the specified RPM (or read back the RPM setting). 22362306a36Sopenharmony_ci * This works in closed loop mode only. Use pwm1 for open loop speed setting. 22462306a36Sopenharmony_ci * 22562306a36Sopenharmony_ci * The MAX6650/1 will automatically control fan speed when in closed loop 22662306a36Sopenharmony_ci * mode. 22762306a36Sopenharmony_ci * 22862306a36Sopenharmony_ci * Assumptions: 22962306a36Sopenharmony_ci * 23062306a36Sopenharmony_ci * 1) The MAX6650/1 internal 254kHz clock frequency is set correctly. Use 23162306a36Sopenharmony_ci * the clock module parameter if you need to fine tune this. 23262306a36Sopenharmony_ci * 23362306a36Sopenharmony_ci * 2) The prescaler (low three bits of the config register) has already 23462306a36Sopenharmony_ci * been set to an appropriate value. Use the prescaler module parameter 23562306a36Sopenharmony_ci * if your BIOS doesn't initialize the chip properly. 23662306a36Sopenharmony_ci * 23762306a36Sopenharmony_ci * The relevant equations are given on pages 21 and 22 of the datasheet. 23862306a36Sopenharmony_ci * 23962306a36Sopenharmony_ci * From the datasheet, the relevant equation when in regulation is: 24062306a36Sopenharmony_ci * 24162306a36Sopenharmony_ci * [fCLK / (128 x (KTACH + 1))] = 2 x FanSpeed / KSCALE 24262306a36Sopenharmony_ci * 24362306a36Sopenharmony_ci * where: 24462306a36Sopenharmony_ci * 24562306a36Sopenharmony_ci * fCLK is the oscillator frequency (either the 254kHz internal 24662306a36Sopenharmony_ci * oscillator or the externally applied clock) 24762306a36Sopenharmony_ci * 24862306a36Sopenharmony_ci * KTACH is the value in the speed register 24962306a36Sopenharmony_ci * 25062306a36Sopenharmony_ci * FanSpeed is the speed of the fan in rps 25162306a36Sopenharmony_ci * 25262306a36Sopenharmony_ci * KSCALE is the prescaler value (1, 2, 4, 8, or 16) 25362306a36Sopenharmony_ci * 25462306a36Sopenharmony_ci * When reading, we need to solve for FanSpeed. When writing, we need to 25562306a36Sopenharmony_ci * solve for KTACH. 25662306a36Sopenharmony_ci * 25762306a36Sopenharmony_ci * Note: this tachometer is completely separate from the tachometers 25862306a36Sopenharmony_ci * used to measure the fan speeds. Only one fan's speed (fan1) is 25962306a36Sopenharmony_ci * controlled. 26062306a36Sopenharmony_ci */ 26162306a36Sopenharmony_ci 26262306a36Sopenharmony_cistatic int max6650_set_target(struct max6650_data *data, unsigned long rpm) 26362306a36Sopenharmony_ci{ 26462306a36Sopenharmony_ci int kscale, ktach; 26562306a36Sopenharmony_ci 26662306a36Sopenharmony_ci if (rpm == 0) 26762306a36Sopenharmony_ci return max6650_set_operating_mode(data, MAX6650_CFG_MODE_OFF); 26862306a36Sopenharmony_ci 26962306a36Sopenharmony_ci rpm = clamp_val(rpm, FAN_RPM_MIN, FAN_RPM_MAX); 27062306a36Sopenharmony_ci 27162306a36Sopenharmony_ci /* 27262306a36Sopenharmony_ci * Divide the required speed by 60 to get from rpm to rps, then 27362306a36Sopenharmony_ci * use the datasheet equation: 27462306a36Sopenharmony_ci * 27562306a36Sopenharmony_ci * KTACH = [(fCLK x KSCALE) / (256 x FanSpeed)] - 1 27662306a36Sopenharmony_ci */ 27762306a36Sopenharmony_ci 27862306a36Sopenharmony_ci kscale = DIV_FROM_REG(data->config); 27962306a36Sopenharmony_ci ktach = ((clock * kscale) / (256 * rpm / 60)) - 1; 28062306a36Sopenharmony_ci if (ktach < 0) 28162306a36Sopenharmony_ci ktach = 0; 28262306a36Sopenharmony_ci if (ktach > 255) 28362306a36Sopenharmony_ci ktach = 255; 28462306a36Sopenharmony_ci data->speed = ktach; 28562306a36Sopenharmony_ci 28662306a36Sopenharmony_ci return i2c_smbus_write_byte_data(data->client, MAX6650_REG_SPEED, 28762306a36Sopenharmony_ci data->speed); 28862306a36Sopenharmony_ci} 28962306a36Sopenharmony_ci 29062306a36Sopenharmony_ci/* 29162306a36Sopenharmony_ci * Get gpio alarm status: 29262306a36Sopenharmony_ci * Possible values: 29362306a36Sopenharmony_ci * 0 = no alarm 29462306a36Sopenharmony_ci * 1 = alarm 29562306a36Sopenharmony_ci */ 29662306a36Sopenharmony_ci 29762306a36Sopenharmony_cistatic ssize_t alarm_show(struct device *dev, 29862306a36Sopenharmony_ci struct device_attribute *devattr, char *buf) 29962306a36Sopenharmony_ci{ 30062306a36Sopenharmony_ci struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 30162306a36Sopenharmony_ci struct max6650_data *data = max6650_update_device(dev); 30262306a36Sopenharmony_ci bool alarm; 30362306a36Sopenharmony_ci 30462306a36Sopenharmony_ci if (IS_ERR(data)) 30562306a36Sopenharmony_ci return PTR_ERR(data); 30662306a36Sopenharmony_ci 30762306a36Sopenharmony_ci alarm = data->alarm & attr->index; 30862306a36Sopenharmony_ci if (alarm) { 30962306a36Sopenharmony_ci mutex_lock(&data->update_lock); 31062306a36Sopenharmony_ci data->alarm &= ~attr->index; 31162306a36Sopenharmony_ci data->valid = false; 31262306a36Sopenharmony_ci mutex_unlock(&data->update_lock); 31362306a36Sopenharmony_ci } 31462306a36Sopenharmony_ci 31562306a36Sopenharmony_ci return sprintf(buf, "%d\n", alarm); 31662306a36Sopenharmony_ci} 31762306a36Sopenharmony_ci 31862306a36Sopenharmony_cistatic SENSOR_DEVICE_ATTR_RO(gpio1_alarm, alarm, MAX6650_ALRM_GPIO1); 31962306a36Sopenharmony_cistatic SENSOR_DEVICE_ATTR_RO(gpio2_alarm, alarm, MAX6650_ALRM_GPIO2); 32062306a36Sopenharmony_ci 32162306a36Sopenharmony_cistatic umode_t max6650_attrs_visible(struct kobject *kobj, struct attribute *a, 32262306a36Sopenharmony_ci int n) 32362306a36Sopenharmony_ci{ 32462306a36Sopenharmony_ci struct device *dev = kobj_to_dev(kobj); 32562306a36Sopenharmony_ci struct max6650_data *data = dev_get_drvdata(dev); 32662306a36Sopenharmony_ci struct device_attribute *devattr; 32762306a36Sopenharmony_ci 32862306a36Sopenharmony_ci /* 32962306a36Sopenharmony_ci * Hide the alarms that have not been enabled by the firmware 33062306a36Sopenharmony_ci */ 33162306a36Sopenharmony_ci 33262306a36Sopenharmony_ci devattr = container_of(a, struct device_attribute, attr); 33362306a36Sopenharmony_ci if (devattr == &sensor_dev_attr_gpio1_alarm.dev_attr || 33462306a36Sopenharmony_ci devattr == &sensor_dev_attr_gpio2_alarm.dev_attr) { 33562306a36Sopenharmony_ci if (!(data->alarm_en & to_sensor_dev_attr(devattr)->index)) 33662306a36Sopenharmony_ci return 0; 33762306a36Sopenharmony_ci } 33862306a36Sopenharmony_ci 33962306a36Sopenharmony_ci return a->mode; 34062306a36Sopenharmony_ci} 34162306a36Sopenharmony_ci 34262306a36Sopenharmony_cistatic struct attribute *max6650_attrs[] = { 34362306a36Sopenharmony_ci &sensor_dev_attr_gpio1_alarm.dev_attr.attr, 34462306a36Sopenharmony_ci &sensor_dev_attr_gpio2_alarm.dev_attr.attr, 34562306a36Sopenharmony_ci NULL 34662306a36Sopenharmony_ci}; 34762306a36Sopenharmony_ci 34862306a36Sopenharmony_cistatic const struct attribute_group max6650_group = { 34962306a36Sopenharmony_ci .attrs = max6650_attrs, 35062306a36Sopenharmony_ci .is_visible = max6650_attrs_visible, 35162306a36Sopenharmony_ci}; 35262306a36Sopenharmony_ci 35362306a36Sopenharmony_cistatic const struct attribute_group *max6650_groups[] = { 35462306a36Sopenharmony_ci &max6650_group, 35562306a36Sopenharmony_ci NULL 35662306a36Sopenharmony_ci}; 35762306a36Sopenharmony_ci 35862306a36Sopenharmony_cistatic int max6650_init_client(struct max6650_data *data, 35962306a36Sopenharmony_ci struct i2c_client *client) 36062306a36Sopenharmony_ci{ 36162306a36Sopenharmony_ci struct device *dev = &client->dev; 36262306a36Sopenharmony_ci int reg; 36362306a36Sopenharmony_ci int err; 36462306a36Sopenharmony_ci u32 voltage; 36562306a36Sopenharmony_ci u32 prescale; 36662306a36Sopenharmony_ci u32 target_rpm; 36762306a36Sopenharmony_ci 36862306a36Sopenharmony_ci if (of_property_read_u32(dev->of_node, "maxim,fan-microvolt", 36962306a36Sopenharmony_ci &voltage)) 37062306a36Sopenharmony_ci voltage = fan_voltage; 37162306a36Sopenharmony_ci else 37262306a36Sopenharmony_ci voltage /= 1000000; /* Microvolts to volts */ 37362306a36Sopenharmony_ci if (of_property_read_u32(dev->of_node, "maxim,fan-prescale", 37462306a36Sopenharmony_ci &prescale)) 37562306a36Sopenharmony_ci prescale = prescaler; 37662306a36Sopenharmony_ci 37762306a36Sopenharmony_ci reg = i2c_smbus_read_byte_data(client, MAX6650_REG_CONFIG); 37862306a36Sopenharmony_ci if (reg < 0) { 37962306a36Sopenharmony_ci dev_err(dev, "Error reading config register, aborting.\n"); 38062306a36Sopenharmony_ci return reg; 38162306a36Sopenharmony_ci } 38262306a36Sopenharmony_ci 38362306a36Sopenharmony_ci switch (voltage) { 38462306a36Sopenharmony_ci case 0: 38562306a36Sopenharmony_ci break; 38662306a36Sopenharmony_ci case 5: 38762306a36Sopenharmony_ci reg &= ~MAX6650_CFG_V12; 38862306a36Sopenharmony_ci break; 38962306a36Sopenharmony_ci case 12: 39062306a36Sopenharmony_ci reg |= MAX6650_CFG_V12; 39162306a36Sopenharmony_ci break; 39262306a36Sopenharmony_ci default: 39362306a36Sopenharmony_ci dev_err(dev, "illegal value for fan_voltage (%d)\n", voltage); 39462306a36Sopenharmony_ci } 39562306a36Sopenharmony_ci 39662306a36Sopenharmony_ci switch (prescale) { 39762306a36Sopenharmony_ci case 0: 39862306a36Sopenharmony_ci break; 39962306a36Sopenharmony_ci case 1: 40062306a36Sopenharmony_ci reg &= ~MAX6650_CFG_PRESCALER_MASK; 40162306a36Sopenharmony_ci break; 40262306a36Sopenharmony_ci case 2: 40362306a36Sopenharmony_ci reg = (reg & ~MAX6650_CFG_PRESCALER_MASK) 40462306a36Sopenharmony_ci | MAX6650_CFG_PRESCALER_2; 40562306a36Sopenharmony_ci break; 40662306a36Sopenharmony_ci case 4: 40762306a36Sopenharmony_ci reg = (reg & ~MAX6650_CFG_PRESCALER_MASK) 40862306a36Sopenharmony_ci | MAX6650_CFG_PRESCALER_4; 40962306a36Sopenharmony_ci break; 41062306a36Sopenharmony_ci case 8: 41162306a36Sopenharmony_ci reg = (reg & ~MAX6650_CFG_PRESCALER_MASK) 41262306a36Sopenharmony_ci | MAX6650_CFG_PRESCALER_8; 41362306a36Sopenharmony_ci break; 41462306a36Sopenharmony_ci case 16: 41562306a36Sopenharmony_ci reg = (reg & ~MAX6650_CFG_PRESCALER_MASK) 41662306a36Sopenharmony_ci | MAX6650_CFG_PRESCALER_16; 41762306a36Sopenharmony_ci break; 41862306a36Sopenharmony_ci default: 41962306a36Sopenharmony_ci dev_err(dev, "illegal value for prescaler (%d)\n", prescale); 42062306a36Sopenharmony_ci } 42162306a36Sopenharmony_ci 42262306a36Sopenharmony_ci dev_info(dev, "Fan voltage: %dV, prescaler: %d.\n", 42362306a36Sopenharmony_ci (reg & MAX6650_CFG_V12) ? 12 : 5, 42462306a36Sopenharmony_ci 1 << (reg & MAX6650_CFG_PRESCALER_MASK)); 42562306a36Sopenharmony_ci 42662306a36Sopenharmony_ci err = i2c_smbus_write_byte_data(client, MAX6650_REG_CONFIG, reg); 42762306a36Sopenharmony_ci if (err) { 42862306a36Sopenharmony_ci dev_err(dev, "Config write error, aborting.\n"); 42962306a36Sopenharmony_ci return err; 43062306a36Sopenharmony_ci } 43162306a36Sopenharmony_ci data->config = reg; 43262306a36Sopenharmony_ci 43362306a36Sopenharmony_ci reg = i2c_smbus_read_byte_data(client, MAX6650_REG_SPEED); 43462306a36Sopenharmony_ci if (reg < 0) { 43562306a36Sopenharmony_ci dev_err(dev, "Failed to read speed register, aborting.\n"); 43662306a36Sopenharmony_ci return reg; 43762306a36Sopenharmony_ci } 43862306a36Sopenharmony_ci data->speed = reg; 43962306a36Sopenharmony_ci 44062306a36Sopenharmony_ci reg = i2c_smbus_read_byte_data(client, MAX6650_REG_DAC); 44162306a36Sopenharmony_ci if (reg < 0) { 44262306a36Sopenharmony_ci dev_err(dev, "Failed to read DAC register, aborting.\n"); 44362306a36Sopenharmony_ci return reg; 44462306a36Sopenharmony_ci } 44562306a36Sopenharmony_ci data->dac = reg; 44662306a36Sopenharmony_ci 44762306a36Sopenharmony_ci reg = i2c_smbus_read_byte_data(client, MAX6650_REG_COUNT); 44862306a36Sopenharmony_ci if (reg < 0) { 44962306a36Sopenharmony_ci dev_err(dev, "Failed to read count register, aborting.\n"); 45062306a36Sopenharmony_ci return reg; 45162306a36Sopenharmony_ci } 45262306a36Sopenharmony_ci data->count = reg; 45362306a36Sopenharmony_ci 45462306a36Sopenharmony_ci reg = i2c_smbus_read_byte_data(client, MAX6650_REG_ALARM_EN); 45562306a36Sopenharmony_ci if (reg < 0) { 45662306a36Sopenharmony_ci dev_err(dev, "Failed to read alarm configuration, aborting.\n"); 45762306a36Sopenharmony_ci return reg; 45862306a36Sopenharmony_ci } 45962306a36Sopenharmony_ci data->alarm_en = reg; 46062306a36Sopenharmony_ci 46162306a36Sopenharmony_ci if (!of_property_read_u32(client->dev.of_node, "maxim,fan-target-rpm", 46262306a36Sopenharmony_ci &target_rpm)) { 46362306a36Sopenharmony_ci max6650_set_target(data, target_rpm); 46462306a36Sopenharmony_ci max6650_set_operating_mode(data, MAX6650_CFG_MODE_CLOSED_LOOP); 46562306a36Sopenharmony_ci } 46662306a36Sopenharmony_ci 46762306a36Sopenharmony_ci return 0; 46862306a36Sopenharmony_ci} 46962306a36Sopenharmony_ci 47062306a36Sopenharmony_cistatic int max6650_get_max_state(struct thermal_cooling_device *cdev, 47162306a36Sopenharmony_ci unsigned long *state) 47262306a36Sopenharmony_ci{ 47362306a36Sopenharmony_ci *state = 255; 47462306a36Sopenharmony_ci 47562306a36Sopenharmony_ci return 0; 47662306a36Sopenharmony_ci} 47762306a36Sopenharmony_ci 47862306a36Sopenharmony_cistatic int max6650_get_cur_state(struct thermal_cooling_device *cdev, 47962306a36Sopenharmony_ci unsigned long *state) 48062306a36Sopenharmony_ci{ 48162306a36Sopenharmony_ci struct max6650_data *data = cdev->devdata; 48262306a36Sopenharmony_ci 48362306a36Sopenharmony_ci *state = data->cooling_dev_state; 48462306a36Sopenharmony_ci 48562306a36Sopenharmony_ci return 0; 48662306a36Sopenharmony_ci} 48762306a36Sopenharmony_ci 48862306a36Sopenharmony_cistatic int max6650_set_cur_state(struct thermal_cooling_device *cdev, 48962306a36Sopenharmony_ci unsigned long state) 49062306a36Sopenharmony_ci{ 49162306a36Sopenharmony_ci struct max6650_data *data = cdev->devdata; 49262306a36Sopenharmony_ci struct i2c_client *client = data->client; 49362306a36Sopenharmony_ci int err; 49462306a36Sopenharmony_ci 49562306a36Sopenharmony_ci state = clamp_val(state, 0, 255); 49662306a36Sopenharmony_ci 49762306a36Sopenharmony_ci mutex_lock(&data->update_lock); 49862306a36Sopenharmony_ci 49962306a36Sopenharmony_ci data->dac = pwm_to_dac(state, data->config & MAX6650_CFG_V12); 50062306a36Sopenharmony_ci err = i2c_smbus_write_byte_data(client, MAX6650_REG_DAC, data->dac); 50162306a36Sopenharmony_ci if (!err) { 50262306a36Sopenharmony_ci max6650_set_operating_mode(data, state ? 50362306a36Sopenharmony_ci MAX6650_CFG_MODE_OPEN_LOOP : 50462306a36Sopenharmony_ci MAX6650_CFG_MODE_OFF); 50562306a36Sopenharmony_ci data->cooling_dev_state = state; 50662306a36Sopenharmony_ci } 50762306a36Sopenharmony_ci 50862306a36Sopenharmony_ci mutex_unlock(&data->update_lock); 50962306a36Sopenharmony_ci 51062306a36Sopenharmony_ci return err; 51162306a36Sopenharmony_ci} 51262306a36Sopenharmony_ci 51362306a36Sopenharmony_cistatic const struct thermal_cooling_device_ops max6650_cooling_ops = { 51462306a36Sopenharmony_ci .get_max_state = max6650_get_max_state, 51562306a36Sopenharmony_ci .get_cur_state = max6650_get_cur_state, 51662306a36Sopenharmony_ci .set_cur_state = max6650_set_cur_state, 51762306a36Sopenharmony_ci}; 51862306a36Sopenharmony_ci 51962306a36Sopenharmony_cistatic int max6650_read(struct device *dev, enum hwmon_sensor_types type, 52062306a36Sopenharmony_ci u32 attr, int channel, long *val) 52162306a36Sopenharmony_ci{ 52262306a36Sopenharmony_ci struct max6650_data *data = max6650_update_device(dev); 52362306a36Sopenharmony_ci int mode; 52462306a36Sopenharmony_ci 52562306a36Sopenharmony_ci if (IS_ERR(data)) 52662306a36Sopenharmony_ci return PTR_ERR(data); 52762306a36Sopenharmony_ci 52862306a36Sopenharmony_ci switch (type) { 52962306a36Sopenharmony_ci case hwmon_pwm: 53062306a36Sopenharmony_ci switch (attr) { 53162306a36Sopenharmony_ci case hwmon_pwm_input: 53262306a36Sopenharmony_ci *val = dac_to_pwm(data->dac, 53362306a36Sopenharmony_ci data->config & MAX6650_CFG_V12); 53462306a36Sopenharmony_ci break; 53562306a36Sopenharmony_ci case hwmon_pwm_enable: 53662306a36Sopenharmony_ci /* 53762306a36Sopenharmony_ci * Possible values: 53862306a36Sopenharmony_ci * 0 = Fan always on 53962306a36Sopenharmony_ci * 1 = Open loop, Voltage is set according to speed, 54062306a36Sopenharmony_ci * not regulated. 54162306a36Sopenharmony_ci * 2 = Closed loop, RPM for all fans regulated by fan1 54262306a36Sopenharmony_ci * tachometer 54362306a36Sopenharmony_ci * 3 = Fan off 54462306a36Sopenharmony_ci */ 54562306a36Sopenharmony_ci mode = (data->config & MAX6650_CFG_MODE_MASK) >> 4; 54662306a36Sopenharmony_ci *val = (4 - mode) & 3; /* {0 1 2 3} -> {0 3 2 1} */ 54762306a36Sopenharmony_ci break; 54862306a36Sopenharmony_ci default: 54962306a36Sopenharmony_ci return -EOPNOTSUPP; 55062306a36Sopenharmony_ci } 55162306a36Sopenharmony_ci break; 55262306a36Sopenharmony_ci case hwmon_fan: 55362306a36Sopenharmony_ci switch (attr) { 55462306a36Sopenharmony_ci case hwmon_fan_input: 55562306a36Sopenharmony_ci /* 55662306a36Sopenharmony_ci * Calculation details: 55762306a36Sopenharmony_ci * 55862306a36Sopenharmony_ci * Each tachometer counts over an interval given by the 55962306a36Sopenharmony_ci * "count" register (0.25, 0.5, 1 or 2 seconds). 56062306a36Sopenharmony_ci * The driver assumes that the fans produce two pulses 56162306a36Sopenharmony_ci * per revolution (this seems to be the most common). 56262306a36Sopenharmony_ci */ 56362306a36Sopenharmony_ci *val = DIV_ROUND_CLOSEST(data->tach[channel] * 120, 56462306a36Sopenharmony_ci DIV_FROM_REG(data->count)); 56562306a36Sopenharmony_ci break; 56662306a36Sopenharmony_ci case hwmon_fan_div: 56762306a36Sopenharmony_ci *val = DIV_FROM_REG(data->count); 56862306a36Sopenharmony_ci break; 56962306a36Sopenharmony_ci case hwmon_fan_target: 57062306a36Sopenharmony_ci /* 57162306a36Sopenharmony_ci * Use the datasheet equation: 57262306a36Sopenharmony_ci * FanSpeed = KSCALE x fCLK / [256 x (KTACH + 1)] 57362306a36Sopenharmony_ci * then multiply by 60 to give rpm. 57462306a36Sopenharmony_ci */ 57562306a36Sopenharmony_ci *val = 60 * DIV_FROM_REG(data->config) * clock / 57662306a36Sopenharmony_ci (256 * (data->speed + 1)); 57762306a36Sopenharmony_ci break; 57862306a36Sopenharmony_ci case hwmon_fan_min_alarm: 57962306a36Sopenharmony_ci *val = !!(data->alarm & MAX6650_ALRM_MIN); 58062306a36Sopenharmony_ci data->alarm &= ~MAX6650_ALRM_MIN; 58162306a36Sopenharmony_ci data->valid = false; 58262306a36Sopenharmony_ci break; 58362306a36Sopenharmony_ci case hwmon_fan_max_alarm: 58462306a36Sopenharmony_ci *val = !!(data->alarm & MAX6650_ALRM_MAX); 58562306a36Sopenharmony_ci data->alarm &= ~MAX6650_ALRM_MAX; 58662306a36Sopenharmony_ci data->valid = false; 58762306a36Sopenharmony_ci break; 58862306a36Sopenharmony_ci case hwmon_fan_fault: 58962306a36Sopenharmony_ci *val = !!(data->alarm & MAX6650_ALRM_TACH); 59062306a36Sopenharmony_ci data->alarm &= ~MAX6650_ALRM_TACH; 59162306a36Sopenharmony_ci data->valid = false; 59262306a36Sopenharmony_ci break; 59362306a36Sopenharmony_ci default: 59462306a36Sopenharmony_ci return -EOPNOTSUPP; 59562306a36Sopenharmony_ci } 59662306a36Sopenharmony_ci break; 59762306a36Sopenharmony_ci default: 59862306a36Sopenharmony_ci return -EOPNOTSUPP; 59962306a36Sopenharmony_ci } 60062306a36Sopenharmony_ci return 0; 60162306a36Sopenharmony_ci} 60262306a36Sopenharmony_ci 60362306a36Sopenharmony_cistatic const u8 max6650_pwm_modes[] = { 60462306a36Sopenharmony_ci MAX6650_CFG_MODE_ON, 60562306a36Sopenharmony_ci MAX6650_CFG_MODE_OPEN_LOOP, 60662306a36Sopenharmony_ci MAX6650_CFG_MODE_CLOSED_LOOP, 60762306a36Sopenharmony_ci MAX6650_CFG_MODE_OFF, 60862306a36Sopenharmony_ci}; 60962306a36Sopenharmony_ci 61062306a36Sopenharmony_cistatic int max6650_write(struct device *dev, enum hwmon_sensor_types type, 61162306a36Sopenharmony_ci u32 attr, int channel, long val) 61262306a36Sopenharmony_ci{ 61362306a36Sopenharmony_ci struct max6650_data *data = dev_get_drvdata(dev); 61462306a36Sopenharmony_ci int ret = 0; 61562306a36Sopenharmony_ci u8 reg; 61662306a36Sopenharmony_ci 61762306a36Sopenharmony_ci mutex_lock(&data->update_lock); 61862306a36Sopenharmony_ci 61962306a36Sopenharmony_ci switch (type) { 62062306a36Sopenharmony_ci case hwmon_pwm: 62162306a36Sopenharmony_ci switch (attr) { 62262306a36Sopenharmony_ci case hwmon_pwm_input: 62362306a36Sopenharmony_ci reg = pwm_to_dac(clamp_val(val, 0, 255), 62462306a36Sopenharmony_ci data->config & MAX6650_CFG_V12); 62562306a36Sopenharmony_ci ret = i2c_smbus_write_byte_data(data->client, 62662306a36Sopenharmony_ci MAX6650_REG_DAC, reg); 62762306a36Sopenharmony_ci if (ret) 62862306a36Sopenharmony_ci break; 62962306a36Sopenharmony_ci data->dac = reg; 63062306a36Sopenharmony_ci break; 63162306a36Sopenharmony_ci case hwmon_pwm_enable: 63262306a36Sopenharmony_ci if (val < 0 || val >= ARRAY_SIZE(max6650_pwm_modes)) { 63362306a36Sopenharmony_ci ret = -EINVAL; 63462306a36Sopenharmony_ci break; 63562306a36Sopenharmony_ci } 63662306a36Sopenharmony_ci ret = max6650_set_operating_mode(data, 63762306a36Sopenharmony_ci max6650_pwm_modes[val]); 63862306a36Sopenharmony_ci break; 63962306a36Sopenharmony_ci default: 64062306a36Sopenharmony_ci ret = -EOPNOTSUPP; 64162306a36Sopenharmony_ci break; 64262306a36Sopenharmony_ci } 64362306a36Sopenharmony_ci break; 64462306a36Sopenharmony_ci case hwmon_fan: 64562306a36Sopenharmony_ci switch (attr) { 64662306a36Sopenharmony_ci case hwmon_fan_div: 64762306a36Sopenharmony_ci switch (val) { 64862306a36Sopenharmony_ci case 1: 64962306a36Sopenharmony_ci reg = 0; 65062306a36Sopenharmony_ci break; 65162306a36Sopenharmony_ci case 2: 65262306a36Sopenharmony_ci reg = 1; 65362306a36Sopenharmony_ci break; 65462306a36Sopenharmony_ci case 4: 65562306a36Sopenharmony_ci reg = 2; 65662306a36Sopenharmony_ci break; 65762306a36Sopenharmony_ci case 8: 65862306a36Sopenharmony_ci reg = 3; 65962306a36Sopenharmony_ci break; 66062306a36Sopenharmony_ci default: 66162306a36Sopenharmony_ci ret = -EINVAL; 66262306a36Sopenharmony_ci goto error; 66362306a36Sopenharmony_ci } 66462306a36Sopenharmony_ci ret = i2c_smbus_write_byte_data(data->client, 66562306a36Sopenharmony_ci MAX6650_REG_COUNT, reg); 66662306a36Sopenharmony_ci if (ret) 66762306a36Sopenharmony_ci break; 66862306a36Sopenharmony_ci data->count = reg; 66962306a36Sopenharmony_ci break; 67062306a36Sopenharmony_ci case hwmon_fan_target: 67162306a36Sopenharmony_ci if (val < 0) { 67262306a36Sopenharmony_ci ret = -EINVAL; 67362306a36Sopenharmony_ci break; 67462306a36Sopenharmony_ci } 67562306a36Sopenharmony_ci ret = max6650_set_target(data, val); 67662306a36Sopenharmony_ci break; 67762306a36Sopenharmony_ci default: 67862306a36Sopenharmony_ci ret = -EOPNOTSUPP; 67962306a36Sopenharmony_ci break; 68062306a36Sopenharmony_ci } 68162306a36Sopenharmony_ci break; 68262306a36Sopenharmony_ci default: 68362306a36Sopenharmony_ci ret = -EOPNOTSUPP; 68462306a36Sopenharmony_ci break; 68562306a36Sopenharmony_ci } 68662306a36Sopenharmony_ci 68762306a36Sopenharmony_cierror: 68862306a36Sopenharmony_ci mutex_unlock(&data->update_lock); 68962306a36Sopenharmony_ci return ret; 69062306a36Sopenharmony_ci} 69162306a36Sopenharmony_ci 69262306a36Sopenharmony_cistatic umode_t max6650_is_visible(const void *_data, 69362306a36Sopenharmony_ci enum hwmon_sensor_types type, u32 attr, 69462306a36Sopenharmony_ci int channel) 69562306a36Sopenharmony_ci{ 69662306a36Sopenharmony_ci const struct max6650_data *data = _data; 69762306a36Sopenharmony_ci 69862306a36Sopenharmony_ci if (channel && (channel >= data->nr_fans || type != hwmon_fan)) 69962306a36Sopenharmony_ci return 0; 70062306a36Sopenharmony_ci 70162306a36Sopenharmony_ci switch (type) { 70262306a36Sopenharmony_ci case hwmon_fan: 70362306a36Sopenharmony_ci switch (attr) { 70462306a36Sopenharmony_ci case hwmon_fan_input: 70562306a36Sopenharmony_ci return 0444; 70662306a36Sopenharmony_ci case hwmon_fan_target: 70762306a36Sopenharmony_ci case hwmon_fan_div: 70862306a36Sopenharmony_ci return 0644; 70962306a36Sopenharmony_ci case hwmon_fan_min_alarm: 71062306a36Sopenharmony_ci if (data->alarm_en & MAX6650_ALRM_MIN) 71162306a36Sopenharmony_ci return 0444; 71262306a36Sopenharmony_ci break; 71362306a36Sopenharmony_ci case hwmon_fan_max_alarm: 71462306a36Sopenharmony_ci if (data->alarm_en & MAX6650_ALRM_MAX) 71562306a36Sopenharmony_ci return 0444; 71662306a36Sopenharmony_ci break; 71762306a36Sopenharmony_ci case hwmon_fan_fault: 71862306a36Sopenharmony_ci if (data->alarm_en & MAX6650_ALRM_TACH) 71962306a36Sopenharmony_ci return 0444; 72062306a36Sopenharmony_ci break; 72162306a36Sopenharmony_ci default: 72262306a36Sopenharmony_ci break; 72362306a36Sopenharmony_ci } 72462306a36Sopenharmony_ci break; 72562306a36Sopenharmony_ci case hwmon_pwm: 72662306a36Sopenharmony_ci switch (attr) { 72762306a36Sopenharmony_ci case hwmon_pwm_input: 72862306a36Sopenharmony_ci case hwmon_pwm_enable: 72962306a36Sopenharmony_ci return 0644; 73062306a36Sopenharmony_ci default: 73162306a36Sopenharmony_ci break; 73262306a36Sopenharmony_ci } 73362306a36Sopenharmony_ci break; 73462306a36Sopenharmony_ci default: 73562306a36Sopenharmony_ci break; 73662306a36Sopenharmony_ci } 73762306a36Sopenharmony_ci return 0; 73862306a36Sopenharmony_ci} 73962306a36Sopenharmony_ci 74062306a36Sopenharmony_cistatic const struct hwmon_channel_info * const max6650_info[] = { 74162306a36Sopenharmony_ci HWMON_CHANNEL_INFO(fan, HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_DIV | 74262306a36Sopenharmony_ci HWMON_F_MIN_ALARM | HWMON_F_MAX_ALARM | 74362306a36Sopenharmony_ci HWMON_F_FAULT, 74462306a36Sopenharmony_ci HWMON_F_INPUT, HWMON_F_INPUT, HWMON_F_INPUT), 74562306a36Sopenharmony_ci HWMON_CHANNEL_INFO(pwm, HWMON_PWM_INPUT | HWMON_PWM_ENABLE), 74662306a36Sopenharmony_ci NULL 74762306a36Sopenharmony_ci}; 74862306a36Sopenharmony_ci 74962306a36Sopenharmony_cistatic const struct hwmon_ops max6650_hwmon_ops = { 75062306a36Sopenharmony_ci .read = max6650_read, 75162306a36Sopenharmony_ci .write = max6650_write, 75262306a36Sopenharmony_ci .is_visible = max6650_is_visible, 75362306a36Sopenharmony_ci}; 75462306a36Sopenharmony_ci 75562306a36Sopenharmony_cistatic const struct hwmon_chip_info max6650_chip_info = { 75662306a36Sopenharmony_ci .ops = &max6650_hwmon_ops, 75762306a36Sopenharmony_ci .info = max6650_info, 75862306a36Sopenharmony_ci}; 75962306a36Sopenharmony_ci 76062306a36Sopenharmony_cistatic const struct i2c_device_id max6650_id[]; 76162306a36Sopenharmony_ci 76262306a36Sopenharmony_cistatic int max6650_probe(struct i2c_client *client) 76362306a36Sopenharmony_ci{ 76462306a36Sopenharmony_ci struct thermal_cooling_device *cooling_dev; 76562306a36Sopenharmony_ci struct device *dev = &client->dev; 76662306a36Sopenharmony_ci const struct of_device_id *of_id = 76762306a36Sopenharmony_ci of_match_device(of_match_ptr(max6650_dt_match), dev); 76862306a36Sopenharmony_ci struct max6650_data *data; 76962306a36Sopenharmony_ci struct device *hwmon_dev; 77062306a36Sopenharmony_ci int err; 77162306a36Sopenharmony_ci 77262306a36Sopenharmony_ci data = devm_kzalloc(dev, sizeof(struct max6650_data), GFP_KERNEL); 77362306a36Sopenharmony_ci if (!data) 77462306a36Sopenharmony_ci return -ENOMEM; 77562306a36Sopenharmony_ci 77662306a36Sopenharmony_ci data->client = client; 77762306a36Sopenharmony_ci i2c_set_clientdata(client, data); 77862306a36Sopenharmony_ci mutex_init(&data->update_lock); 77962306a36Sopenharmony_ci data->nr_fans = of_id ? (int)(uintptr_t)of_id->data : 78062306a36Sopenharmony_ci i2c_match_id(max6650_id, client)->driver_data; 78162306a36Sopenharmony_ci 78262306a36Sopenharmony_ci /* 78362306a36Sopenharmony_ci * Initialize the max6650 chip 78462306a36Sopenharmony_ci */ 78562306a36Sopenharmony_ci err = max6650_init_client(data, client); 78662306a36Sopenharmony_ci if (err) 78762306a36Sopenharmony_ci return err; 78862306a36Sopenharmony_ci 78962306a36Sopenharmony_ci hwmon_dev = devm_hwmon_device_register_with_info(dev, 79062306a36Sopenharmony_ci client->name, data, 79162306a36Sopenharmony_ci &max6650_chip_info, 79262306a36Sopenharmony_ci max6650_groups); 79362306a36Sopenharmony_ci err = PTR_ERR_OR_ZERO(hwmon_dev); 79462306a36Sopenharmony_ci if (err) 79562306a36Sopenharmony_ci return err; 79662306a36Sopenharmony_ci 79762306a36Sopenharmony_ci if (IS_ENABLED(CONFIG_THERMAL)) { 79862306a36Sopenharmony_ci cooling_dev = devm_thermal_of_cooling_device_register(dev, 79962306a36Sopenharmony_ci dev->of_node, client->name, 80062306a36Sopenharmony_ci data, &max6650_cooling_ops); 80162306a36Sopenharmony_ci if (IS_ERR(cooling_dev)) { 80262306a36Sopenharmony_ci dev_warn(dev, "thermal cooling device register failed: %ld\n", 80362306a36Sopenharmony_ci PTR_ERR(cooling_dev)); 80462306a36Sopenharmony_ci } 80562306a36Sopenharmony_ci } 80662306a36Sopenharmony_ci 80762306a36Sopenharmony_ci return 0; 80862306a36Sopenharmony_ci} 80962306a36Sopenharmony_ci 81062306a36Sopenharmony_cistatic const struct i2c_device_id max6650_id[] = { 81162306a36Sopenharmony_ci { "max6650", 1 }, 81262306a36Sopenharmony_ci { "max6651", 4 }, 81362306a36Sopenharmony_ci { } 81462306a36Sopenharmony_ci}; 81562306a36Sopenharmony_ciMODULE_DEVICE_TABLE(i2c, max6650_id); 81662306a36Sopenharmony_ci 81762306a36Sopenharmony_cistatic struct i2c_driver max6650_driver = { 81862306a36Sopenharmony_ci .driver = { 81962306a36Sopenharmony_ci .name = "max6650", 82062306a36Sopenharmony_ci .of_match_table = of_match_ptr(max6650_dt_match), 82162306a36Sopenharmony_ci }, 82262306a36Sopenharmony_ci .probe = max6650_probe, 82362306a36Sopenharmony_ci .id_table = max6650_id, 82462306a36Sopenharmony_ci}; 82562306a36Sopenharmony_ci 82662306a36Sopenharmony_cimodule_i2c_driver(max6650_driver); 82762306a36Sopenharmony_ci 82862306a36Sopenharmony_ciMODULE_AUTHOR("Hans J. Koch"); 82962306a36Sopenharmony_ciMODULE_DESCRIPTION("MAX6650 sensor driver"); 83062306a36Sopenharmony_ciMODULE_LICENSE("GPL"); 831