mirror of
https://github.com/torvalds/linux.git
synced 2024-12-05 18:41:23 +00:00
f1fc688c65
Switch to using the new API kobj_to_dev() to fix the below warnning: drivers/hwmon/max6650.c:324:60-61: WARNING opportunity for kobj_to_dev(). Signed-off-by: Tian Tao <tiantao6@hisilicon.com> Link: https://lore.kernel.org/r/1609376621-46463-1-git-send-email-tiantao6@hisilicon.com Signed-off-by: Guenter Roeck <linux@roeck-us.net>
831 lines
19 KiB
C
831 lines
19 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* max6650.c - Part of lm_sensors, Linux kernel modules for hardware
|
|
* monitoring.
|
|
*
|
|
* (C) 2007 by Hans J. Koch <hjk@hansjkoch.de>
|
|
*
|
|
* based on code written by John Morris <john.morris@spirentcom.com>
|
|
* Copyright (c) 2003 Spirent Communications
|
|
* and Claus Gindhart <claus.gindhart@kontron.com>
|
|
*
|
|
* This module has only been tested with the MAX6650 chip. It should
|
|
* also work with the MAX6651. It does not distinguish max6650 and max6651
|
|
* chips.
|
|
*
|
|
* The datasheet was last seen at:
|
|
*
|
|
* http://pdfserv.maxim-ic.com/en/ds/MAX6650-MAX6651.pdf
|
|
*/
|
|
|
|
#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/of_device.h>
|
|
#include <linux/thermal.h>
|
|
|
|
/*
|
|
* Insmod parameters
|
|
*/
|
|
|
|
/* fan_voltage: 5=5V fan, 12=12V fan, 0=don't change */
|
|
static int fan_voltage;
|
|
/* prescaler: Possible values are 1, 2, 4, 8, 16 or 0 for don't change */
|
|
static int prescaler;
|
|
/* clock: The clock frequency of the chip (max6651 can be clocked externally) */
|
|
static int clock = 254000;
|
|
|
|
module_param(fan_voltage, int, 0444);
|
|
module_param(prescaler, int, 0444);
|
|
module_param(clock, int, 0444);
|
|
|
|
/*
|
|
* MAX 6650/6651 registers
|
|
*/
|
|
|
|
#define MAX6650_REG_SPEED 0x00
|
|
#define MAX6650_REG_CONFIG 0x02
|
|
#define MAX6650_REG_GPIO_DEF 0x04
|
|
#define MAX6650_REG_DAC 0x06
|
|
#define MAX6650_REG_ALARM_EN 0x08
|
|
#define MAX6650_REG_ALARM 0x0A
|
|
#define MAX6650_REG_TACH0 0x0C
|
|
#define MAX6650_REG_TACH1 0x0E
|
|
#define MAX6650_REG_TACH2 0x10
|
|
#define MAX6650_REG_TACH3 0x12
|
|
#define MAX6650_REG_GPIO_STAT 0x14
|
|
#define MAX6650_REG_COUNT 0x16
|
|
|
|
/*
|
|
* Config register bits
|
|
*/
|
|
|
|
#define MAX6650_CFG_V12 0x08
|
|
#define MAX6650_CFG_PRESCALER_MASK 0x07
|
|
#define MAX6650_CFG_PRESCALER_2 0x01
|
|
#define MAX6650_CFG_PRESCALER_4 0x02
|
|
#define MAX6650_CFG_PRESCALER_8 0x03
|
|
#define MAX6650_CFG_PRESCALER_16 0x04
|
|
#define MAX6650_CFG_MODE_MASK 0x30
|
|
#define MAX6650_CFG_MODE_ON 0x00
|
|
#define MAX6650_CFG_MODE_OFF 0x10
|
|
#define MAX6650_CFG_MODE_CLOSED_LOOP 0x20
|
|
#define MAX6650_CFG_MODE_OPEN_LOOP 0x30
|
|
#define MAX6650_COUNT_MASK 0x03
|
|
|
|
/*
|
|
* Alarm status register bits
|
|
*/
|
|
|
|
#define MAX6650_ALRM_MAX 0x01
|
|
#define MAX6650_ALRM_MIN 0x02
|
|
#define MAX6650_ALRM_TACH 0x04
|
|
#define MAX6650_ALRM_GPIO1 0x08
|
|
#define MAX6650_ALRM_GPIO2 0x10
|
|
|
|
/* Minimum and maximum values of the FAN-RPM */
|
|
#define FAN_RPM_MIN 240
|
|
#define FAN_RPM_MAX 30000
|
|
|
|
#define DIV_FROM_REG(reg) (1 << ((reg) & 7))
|
|
#define DAC_LIMIT(v12) ((v12) ? 180 : 76)
|
|
|
|
/*
|
|
* Client data (each client gets its own)
|
|
*/
|
|
|
|
struct max6650_data {
|
|
struct i2c_client *client;
|
|
struct mutex update_lock; /* protect alarm register updates */
|
|
int nr_fans;
|
|
bool valid; /* false until following fields are valid */
|
|
unsigned long last_updated; /* in jiffies */
|
|
|
|
/* register values */
|
|
u8 speed;
|
|
u8 config;
|
|
u8 tach[4];
|
|
u8 count;
|
|
u8 dac;
|
|
u8 alarm;
|
|
u8 alarm_en;
|
|
unsigned long cooling_dev_state;
|
|
};
|
|
|
|
static const u8 tach_reg[] = {
|
|
MAX6650_REG_TACH0,
|
|
MAX6650_REG_TACH1,
|
|
MAX6650_REG_TACH2,
|
|
MAX6650_REG_TACH3,
|
|
};
|
|
|
|
static const struct of_device_id __maybe_unused max6650_dt_match[] = {
|
|
{
|
|
.compatible = "maxim,max6650",
|
|
.data = (void *)1
|
|
},
|
|
{
|
|
.compatible = "maxim,max6651",
|
|
.data = (void *)4
|
|
},
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, max6650_dt_match);
|
|
|
|
static int dac_to_pwm(int dac, bool v12)
|
|
{
|
|
/*
|
|
* Useful range for dac is 0-180 for 12V fans and 0-76 for 5V fans.
|
|
* Lower DAC values mean higher speeds.
|
|
*/
|
|
return clamp_val(255 - (255 * dac) / DAC_LIMIT(v12), 0, 255);
|
|
}
|
|
|
|
static u8 pwm_to_dac(unsigned int pwm, bool v12)
|
|
{
|
|
int limit = DAC_LIMIT(v12);
|
|
|
|
return limit - (limit * pwm) / 255;
|
|
}
|
|
|
|
static struct max6650_data *max6650_update_device(struct device *dev)
|
|
{
|
|
struct max6650_data *data = dev_get_drvdata(dev);
|
|
struct i2c_client *client = data->client;
|
|
int reg, err = 0;
|
|
int i;
|
|
|
|
mutex_lock(&data->update_lock);
|
|
|
|
if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
|
|
for (i = 0; i < data->nr_fans; i++) {
|
|
reg = i2c_smbus_read_byte_data(client, tach_reg[i]);
|
|
if (reg < 0) {
|
|
err = reg;
|
|
goto error;
|
|
}
|
|
data->tach[i] = reg;
|
|
}
|
|
|
|
/*
|
|
* Alarms are cleared on read in case the condition that
|
|
* caused the alarm is removed. Keep the value latched here
|
|
* for providing the register through different alarm files.
|
|
*/
|
|
reg = i2c_smbus_read_byte_data(client, MAX6650_REG_ALARM);
|
|
if (reg < 0) {
|
|
err = reg;
|
|
goto error;
|
|
}
|
|
data->alarm |= reg;
|
|
data->last_updated = jiffies;
|
|
data->valid = true;
|
|
}
|
|
|
|
error:
|
|
mutex_unlock(&data->update_lock);
|
|
if (err)
|
|
data = ERR_PTR(err);
|
|
return data;
|
|
}
|
|
|
|
/*
|
|
* Change the operating mode of the chip (if needed).
|
|
* mode is one of the MAX6650_CFG_MODE_* values.
|
|
*/
|
|
static int max6650_set_operating_mode(struct max6650_data *data, u8 mode)
|
|
{
|
|
int result;
|
|
u8 config = data->config;
|
|
|
|
if (mode == (config & MAX6650_CFG_MODE_MASK))
|
|
return 0;
|
|
|
|
config = (config & ~MAX6650_CFG_MODE_MASK) | mode;
|
|
|
|
result = i2c_smbus_write_byte_data(data->client, MAX6650_REG_CONFIG,
|
|
config);
|
|
if (result < 0)
|
|
return result;
|
|
|
|
data->config = config;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Set the fan speed to the specified RPM (or read back the RPM setting).
|
|
* This works in closed loop mode only. Use pwm1 for open loop speed setting.
|
|
*
|
|
* The MAX6650/1 will automatically control fan speed when in closed loop
|
|
* mode.
|
|
*
|
|
* Assumptions:
|
|
*
|
|
* 1) The MAX6650/1 internal 254kHz clock frequency is set correctly. Use
|
|
* the clock module parameter if you need to fine tune this.
|
|
*
|
|
* 2) The prescaler (low three bits of the config register) has already
|
|
* been set to an appropriate value. Use the prescaler module parameter
|
|
* if your BIOS doesn't initialize the chip properly.
|
|
*
|
|
* The relevant equations are given on pages 21 and 22 of the datasheet.
|
|
*
|
|
* From the datasheet, the relevant equation when in regulation is:
|
|
*
|
|
* [fCLK / (128 x (KTACH + 1))] = 2 x FanSpeed / KSCALE
|
|
*
|
|
* where:
|
|
*
|
|
* fCLK is the oscillator frequency (either the 254kHz internal
|
|
* oscillator or the externally applied clock)
|
|
*
|
|
* KTACH is the value in the speed register
|
|
*
|
|
* FanSpeed is the speed of the fan in rps
|
|
*
|
|
* KSCALE is the prescaler value (1, 2, 4, 8, or 16)
|
|
*
|
|
* When reading, we need to solve for FanSpeed. When writing, we need to
|
|
* solve for KTACH.
|
|
*
|
|
* Note: this tachometer is completely separate from the tachometers
|
|
* used to measure the fan speeds. Only one fan's speed (fan1) is
|
|
* controlled.
|
|
*/
|
|
|
|
static int max6650_set_target(struct max6650_data *data, unsigned long rpm)
|
|
{
|
|
int kscale, ktach;
|
|
|
|
if (rpm == 0)
|
|
return max6650_set_operating_mode(data, MAX6650_CFG_MODE_OFF);
|
|
|
|
rpm = clamp_val(rpm, FAN_RPM_MIN, FAN_RPM_MAX);
|
|
|
|
/*
|
|
* Divide the required speed by 60 to get from rpm to rps, then
|
|
* use the datasheet equation:
|
|
*
|
|
* KTACH = [(fCLK x KSCALE) / (256 x FanSpeed)] - 1
|
|
*/
|
|
|
|
kscale = DIV_FROM_REG(data->config);
|
|
ktach = ((clock * kscale) / (256 * rpm / 60)) - 1;
|
|
if (ktach < 0)
|
|
ktach = 0;
|
|
if (ktach > 255)
|
|
ktach = 255;
|
|
data->speed = ktach;
|
|
|
|
return i2c_smbus_write_byte_data(data->client, MAX6650_REG_SPEED,
|
|
data->speed);
|
|
}
|
|
|
|
/*
|
|
* Get gpio alarm status:
|
|
* Possible values:
|
|
* 0 = no alarm
|
|
* 1 = alarm
|
|
*/
|
|
|
|
static ssize_t alarm_show(struct device *dev,
|
|
struct device_attribute *devattr, char *buf)
|
|
{
|
|
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
|
|
struct max6650_data *data = max6650_update_device(dev);
|
|
bool alarm;
|
|
|
|
if (IS_ERR(data))
|
|
return PTR_ERR(data);
|
|
|
|
alarm = data->alarm & attr->index;
|
|
if (alarm) {
|
|
mutex_lock(&data->update_lock);
|
|
data->alarm &= ~attr->index;
|
|
data->valid = false;
|
|
mutex_unlock(&data->update_lock);
|
|
}
|
|
|
|
return sprintf(buf, "%d\n", alarm);
|
|
}
|
|
|
|
static SENSOR_DEVICE_ATTR_RO(gpio1_alarm, alarm, MAX6650_ALRM_GPIO1);
|
|
static SENSOR_DEVICE_ATTR_RO(gpio2_alarm, alarm, MAX6650_ALRM_GPIO2);
|
|
|
|
static umode_t max6650_attrs_visible(struct kobject *kobj, struct attribute *a,
|
|
int n)
|
|
{
|
|
struct device *dev = kobj_to_dev(kobj);
|
|
struct max6650_data *data = dev_get_drvdata(dev);
|
|
struct device_attribute *devattr;
|
|
|
|
/*
|
|
* Hide the alarms that have not been enabled by the firmware
|
|
*/
|
|
|
|
devattr = container_of(a, struct device_attribute, attr);
|
|
if (devattr == &sensor_dev_attr_gpio1_alarm.dev_attr ||
|
|
devattr == &sensor_dev_attr_gpio2_alarm.dev_attr) {
|
|
if (!(data->alarm_en & to_sensor_dev_attr(devattr)->index))
|
|
return 0;
|
|
}
|
|
|
|
return a->mode;
|
|
}
|
|
|
|
static struct attribute *max6650_attrs[] = {
|
|
&sensor_dev_attr_gpio1_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_gpio2_alarm.dev_attr.attr,
|
|
NULL
|
|
};
|
|
|
|
static const struct attribute_group max6650_group = {
|
|
.attrs = max6650_attrs,
|
|
.is_visible = max6650_attrs_visible,
|
|
};
|
|
|
|
static const struct attribute_group *max6650_groups[] = {
|
|
&max6650_group,
|
|
NULL
|
|
};
|
|
|
|
static int max6650_init_client(struct max6650_data *data,
|
|
struct i2c_client *client)
|
|
{
|
|
struct device *dev = &client->dev;
|
|
int reg;
|
|
int err;
|
|
u32 voltage;
|
|
u32 prescale;
|
|
u32 target_rpm;
|
|
|
|
if (of_property_read_u32(dev->of_node, "maxim,fan-microvolt",
|
|
&voltage))
|
|
voltage = fan_voltage;
|
|
else
|
|
voltage /= 1000000; /* Microvolts to volts */
|
|
if (of_property_read_u32(dev->of_node, "maxim,fan-prescale",
|
|
&prescale))
|
|
prescale = prescaler;
|
|
|
|
reg = i2c_smbus_read_byte_data(client, MAX6650_REG_CONFIG);
|
|
if (reg < 0) {
|
|
dev_err(dev, "Error reading config register, aborting.\n");
|
|
return reg;
|
|
}
|
|
|
|
switch (voltage) {
|
|
case 0:
|
|
break;
|
|
case 5:
|
|
reg &= ~MAX6650_CFG_V12;
|
|
break;
|
|
case 12:
|
|
reg |= MAX6650_CFG_V12;
|
|
break;
|
|
default:
|
|
dev_err(dev, "illegal value for fan_voltage (%d)\n", voltage);
|
|
}
|
|
|
|
switch (prescale) {
|
|
case 0:
|
|
break;
|
|
case 1:
|
|
reg &= ~MAX6650_CFG_PRESCALER_MASK;
|
|
break;
|
|
case 2:
|
|
reg = (reg & ~MAX6650_CFG_PRESCALER_MASK)
|
|
| MAX6650_CFG_PRESCALER_2;
|
|
break;
|
|
case 4:
|
|
reg = (reg & ~MAX6650_CFG_PRESCALER_MASK)
|
|
| MAX6650_CFG_PRESCALER_4;
|
|
break;
|
|
case 8:
|
|
reg = (reg & ~MAX6650_CFG_PRESCALER_MASK)
|
|
| MAX6650_CFG_PRESCALER_8;
|
|
break;
|
|
case 16:
|
|
reg = (reg & ~MAX6650_CFG_PRESCALER_MASK)
|
|
| MAX6650_CFG_PRESCALER_16;
|
|
break;
|
|
default:
|
|
dev_err(dev, "illegal value for prescaler (%d)\n", prescale);
|
|
}
|
|
|
|
dev_info(dev, "Fan voltage: %dV, prescaler: %d.\n",
|
|
(reg & MAX6650_CFG_V12) ? 12 : 5,
|
|
1 << (reg & MAX6650_CFG_PRESCALER_MASK));
|
|
|
|
err = i2c_smbus_write_byte_data(client, MAX6650_REG_CONFIG, reg);
|
|
if (err) {
|
|
dev_err(dev, "Config write error, aborting.\n");
|
|
return err;
|
|
}
|
|
data->config = reg;
|
|
|
|
reg = i2c_smbus_read_byte_data(client, MAX6650_REG_SPEED);
|
|
if (reg < 0) {
|
|
dev_err(dev, "Failed to read speed register, aborting.\n");
|
|
return reg;
|
|
}
|
|
data->speed = reg;
|
|
|
|
reg = i2c_smbus_read_byte_data(client, MAX6650_REG_DAC);
|
|
if (reg < 0) {
|
|
dev_err(dev, "Failed to read DAC register, aborting.\n");
|
|
return reg;
|
|
}
|
|
data->dac = reg;
|
|
|
|
reg = i2c_smbus_read_byte_data(client, MAX6650_REG_COUNT);
|
|
if (reg < 0) {
|
|
dev_err(dev, "Failed to read count register, aborting.\n");
|
|
return reg;
|
|
}
|
|
data->count = reg;
|
|
|
|
reg = i2c_smbus_read_byte_data(client, MAX6650_REG_ALARM_EN);
|
|
if (reg < 0) {
|
|
dev_err(dev, "Failed to read alarm configuration, aborting.\n");
|
|
return reg;
|
|
}
|
|
data->alarm_en = reg;
|
|
|
|
if (!of_property_read_u32(client->dev.of_node, "maxim,fan-target-rpm",
|
|
&target_rpm)) {
|
|
max6650_set_target(data, target_rpm);
|
|
max6650_set_operating_mode(data, MAX6650_CFG_MODE_CLOSED_LOOP);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int max6650_get_max_state(struct thermal_cooling_device *cdev,
|
|
unsigned long *state)
|
|
{
|
|
*state = 255;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int max6650_get_cur_state(struct thermal_cooling_device *cdev,
|
|
unsigned long *state)
|
|
{
|
|
struct max6650_data *data = cdev->devdata;
|
|
|
|
*state = data->cooling_dev_state;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int max6650_set_cur_state(struct thermal_cooling_device *cdev,
|
|
unsigned long state)
|
|
{
|
|
struct max6650_data *data = cdev->devdata;
|
|
struct i2c_client *client = data->client;
|
|
int err;
|
|
|
|
state = clamp_val(state, 0, 255);
|
|
|
|
mutex_lock(&data->update_lock);
|
|
|
|
data->dac = pwm_to_dac(state, data->config & MAX6650_CFG_V12);
|
|
err = i2c_smbus_write_byte_data(client, MAX6650_REG_DAC, data->dac);
|
|
if (!err) {
|
|
max6650_set_operating_mode(data, state ?
|
|
MAX6650_CFG_MODE_OPEN_LOOP :
|
|
MAX6650_CFG_MODE_OFF);
|
|
data->cooling_dev_state = state;
|
|
}
|
|
|
|
mutex_unlock(&data->update_lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
static const struct thermal_cooling_device_ops max6650_cooling_ops = {
|
|
.get_max_state = max6650_get_max_state,
|
|
.get_cur_state = max6650_get_cur_state,
|
|
.set_cur_state = max6650_set_cur_state,
|
|
};
|
|
|
|
static int max6650_read(struct device *dev, enum hwmon_sensor_types type,
|
|
u32 attr, int channel, long *val)
|
|
{
|
|
struct max6650_data *data = max6650_update_device(dev);
|
|
int mode;
|
|
|
|
if (IS_ERR(data))
|
|
return PTR_ERR(data);
|
|
|
|
switch (type) {
|
|
case hwmon_pwm:
|
|
switch (attr) {
|
|
case hwmon_pwm_input:
|
|
*val = dac_to_pwm(data->dac,
|
|
data->config & MAX6650_CFG_V12);
|
|
break;
|
|
case hwmon_pwm_enable:
|
|
/*
|
|
* Possible values:
|
|
* 0 = Fan always on
|
|
* 1 = Open loop, Voltage is set according to speed,
|
|
* not regulated.
|
|
* 2 = Closed loop, RPM for all fans regulated by fan1
|
|
* tachometer
|
|
* 3 = Fan off
|
|
*/
|
|
mode = (data->config & MAX6650_CFG_MODE_MASK) >> 4;
|
|
*val = (4 - mode) & 3; /* {0 1 2 3} -> {0 3 2 1} */
|
|
break;
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
break;
|
|
case hwmon_fan:
|
|
switch (attr) {
|
|
case hwmon_fan_input:
|
|
/*
|
|
* Calculation details:
|
|
*
|
|
* Each tachometer counts over an interval given by the
|
|
* "count" register (0.25, 0.5, 1 or 2 seconds).
|
|
* The driver assumes that the fans produce two pulses
|
|
* per revolution (this seems to be the most common).
|
|
*/
|
|
*val = DIV_ROUND_CLOSEST(data->tach[channel] * 120,
|
|
DIV_FROM_REG(data->count));
|
|
break;
|
|
case hwmon_fan_div:
|
|
*val = DIV_FROM_REG(data->count);
|
|
break;
|
|
case hwmon_fan_target:
|
|
/*
|
|
* Use the datasheet equation:
|
|
* FanSpeed = KSCALE x fCLK / [256 x (KTACH + 1)]
|
|
* then multiply by 60 to give rpm.
|
|
*/
|
|
*val = 60 * DIV_FROM_REG(data->config) * clock /
|
|
(256 * (data->speed + 1));
|
|
break;
|
|
case hwmon_fan_min_alarm:
|
|
*val = !!(data->alarm & MAX6650_ALRM_MIN);
|
|
data->alarm &= ~MAX6650_ALRM_MIN;
|
|
data->valid = false;
|
|
break;
|
|
case hwmon_fan_max_alarm:
|
|
*val = !!(data->alarm & MAX6650_ALRM_MAX);
|
|
data->alarm &= ~MAX6650_ALRM_MAX;
|
|
data->valid = false;
|
|
break;
|
|
case hwmon_fan_fault:
|
|
*val = !!(data->alarm & MAX6650_ALRM_TACH);
|
|
data->alarm &= ~MAX6650_ALRM_TACH;
|
|
data->valid = false;
|
|
break;
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
break;
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const u8 max6650_pwm_modes[] = {
|
|
MAX6650_CFG_MODE_ON,
|
|
MAX6650_CFG_MODE_OPEN_LOOP,
|
|
MAX6650_CFG_MODE_CLOSED_LOOP,
|
|
MAX6650_CFG_MODE_OFF,
|
|
};
|
|
|
|
static int max6650_write(struct device *dev, enum hwmon_sensor_types type,
|
|
u32 attr, int channel, long val)
|
|
{
|
|
struct max6650_data *data = dev_get_drvdata(dev);
|
|
int ret = 0;
|
|
u8 reg;
|
|
|
|
mutex_lock(&data->update_lock);
|
|
|
|
switch (type) {
|
|
case hwmon_pwm:
|
|
switch (attr) {
|
|
case hwmon_pwm_input:
|
|
reg = pwm_to_dac(clamp_val(val, 0, 255),
|
|
data->config & MAX6650_CFG_V12);
|
|
ret = i2c_smbus_write_byte_data(data->client,
|
|
MAX6650_REG_DAC, reg);
|
|
if (ret)
|
|
break;
|
|
data->dac = reg;
|
|
break;
|
|
case hwmon_pwm_enable:
|
|
if (val < 0 || val >= ARRAY_SIZE(max6650_pwm_modes)) {
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
ret = max6650_set_operating_mode(data,
|
|
max6650_pwm_modes[val]);
|
|
break;
|
|
default:
|
|
ret = -EOPNOTSUPP;
|
|
break;
|
|
}
|
|
break;
|
|
case hwmon_fan:
|
|
switch (attr) {
|
|
case hwmon_fan_div:
|
|
switch (val) {
|
|
case 1:
|
|
reg = 0;
|
|
break;
|
|
case 2:
|
|
reg = 1;
|
|
break;
|
|
case 4:
|
|
reg = 2;
|
|
break;
|
|
case 8:
|
|
reg = 3;
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
goto error;
|
|
}
|
|
ret = i2c_smbus_write_byte_data(data->client,
|
|
MAX6650_REG_COUNT, reg);
|
|
if (ret)
|
|
break;
|
|
data->count = reg;
|
|
break;
|
|
case hwmon_fan_target:
|
|
if (val < 0) {
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
ret = max6650_set_target(data, val);
|
|
break;
|
|
default:
|
|
ret = -EOPNOTSUPP;
|
|
break;
|
|
}
|
|
break;
|
|
default:
|
|
ret = -EOPNOTSUPP;
|
|
break;
|
|
}
|
|
|
|
error:
|
|
mutex_unlock(&data->update_lock);
|
|
return ret;
|
|
}
|
|
|
|
static umode_t max6650_is_visible(const void *_data,
|
|
enum hwmon_sensor_types type, u32 attr,
|
|
int channel)
|
|
{
|
|
const struct max6650_data *data = _data;
|
|
|
|
if (channel && (channel >= data->nr_fans || type != hwmon_fan))
|
|
return 0;
|
|
|
|
switch (type) {
|
|
case hwmon_fan:
|
|
switch (attr) {
|
|
case hwmon_fan_input:
|
|
return 0444;
|
|
case hwmon_fan_target:
|
|
case hwmon_fan_div:
|
|
return 0644;
|
|
case hwmon_fan_min_alarm:
|
|
if (data->alarm_en & MAX6650_ALRM_MIN)
|
|
return 0444;
|
|
break;
|
|
case hwmon_fan_max_alarm:
|
|
if (data->alarm_en & MAX6650_ALRM_MAX)
|
|
return 0444;
|
|
break;
|
|
case hwmon_fan_fault:
|
|
if (data->alarm_en & MAX6650_ALRM_TACH)
|
|
return 0444;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
case hwmon_pwm:
|
|
switch (attr) {
|
|
case hwmon_pwm_input:
|
|
case hwmon_pwm_enable:
|
|
return 0644;
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const struct hwmon_channel_info *max6650_info[] = {
|
|
HWMON_CHANNEL_INFO(fan, HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_DIV |
|
|
HWMON_F_MIN_ALARM | HWMON_F_MAX_ALARM |
|
|
HWMON_F_FAULT,
|
|
HWMON_F_INPUT, HWMON_F_INPUT, HWMON_F_INPUT),
|
|
HWMON_CHANNEL_INFO(pwm, HWMON_PWM_INPUT | HWMON_PWM_ENABLE),
|
|
NULL
|
|
};
|
|
|
|
static const struct hwmon_ops max6650_hwmon_ops = {
|
|
.read = max6650_read,
|
|
.write = max6650_write,
|
|
.is_visible = max6650_is_visible,
|
|
};
|
|
|
|
static const struct hwmon_chip_info max6650_chip_info = {
|
|
.ops = &max6650_hwmon_ops,
|
|
.info = max6650_info,
|
|
};
|
|
|
|
static const struct i2c_device_id max6650_id[];
|
|
|
|
static int max6650_probe(struct i2c_client *client)
|
|
{
|
|
struct thermal_cooling_device *cooling_dev;
|
|
struct device *dev = &client->dev;
|
|
const struct of_device_id *of_id =
|
|
of_match_device(of_match_ptr(max6650_dt_match), dev);
|
|
struct max6650_data *data;
|
|
struct device *hwmon_dev;
|
|
int err;
|
|
|
|
data = devm_kzalloc(dev, sizeof(struct max6650_data), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
data->client = client;
|
|
i2c_set_clientdata(client, data);
|
|
mutex_init(&data->update_lock);
|
|
data->nr_fans = of_id ? (int)(uintptr_t)of_id->data :
|
|
i2c_match_id(max6650_id, client)->driver_data;
|
|
|
|
/*
|
|
* Initialize the max6650 chip
|
|
*/
|
|
err = max6650_init_client(data, client);
|
|
if (err)
|
|
return err;
|
|
|
|
hwmon_dev = devm_hwmon_device_register_with_info(dev,
|
|
client->name, data,
|
|
&max6650_chip_info,
|
|
max6650_groups);
|
|
err = PTR_ERR_OR_ZERO(hwmon_dev);
|
|
if (err)
|
|
return err;
|
|
|
|
if (IS_ENABLED(CONFIG_THERMAL)) {
|
|
cooling_dev = devm_thermal_of_cooling_device_register(dev,
|
|
dev->of_node, client->name,
|
|
data, &max6650_cooling_ops);
|
|
if (IS_ERR(cooling_dev)) {
|
|
dev_warn(dev, "thermal cooling device register failed: %ld\n",
|
|
PTR_ERR(cooling_dev));
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id max6650_id[] = {
|
|
{ "max6650", 1 },
|
|
{ "max6651", 4 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, max6650_id);
|
|
|
|
static struct i2c_driver max6650_driver = {
|
|
.driver = {
|
|
.name = "max6650",
|
|
.of_match_table = of_match_ptr(max6650_dt_match),
|
|
},
|
|
.probe_new = max6650_probe,
|
|
.id_table = max6650_id,
|
|
};
|
|
|
|
module_i2c_driver(max6650_driver);
|
|
|
|
MODULE_AUTHOR("Hans J. Koch");
|
|
MODULE_DESCRIPTION("MAX6650 sensor driver");
|
|
MODULE_LICENSE("GPL");
|