// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* emc2103.c - Support for SMSC EMC2103
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* Copyright (c) 2010 SMSC
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/jiffies.h>
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#include <linux/i2c.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/err.h>
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#include <linux/mutex.h>
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/* Addresses scanned */
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static const unsigned short normal_i2c[] = { 0x2E, I2C_CLIENT_END };
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static const u8 REG_TEMP[4] = { 0x00, 0x02, 0x04, 0x06 };
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static const u8 REG_TEMP_MIN[4] = { 0x3c, 0x38, 0x39, 0x3a };
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static const u8 REG_TEMP_MAX[4] = { 0x34, 0x30, 0x31, 0x32 };
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#define REG_CONF1 0x20
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#define REG_TEMP_MAX_ALARM 0x24
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#define REG_TEMP_MIN_ALARM 0x25
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#define REG_FAN_CONF1 0x42
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#define REG_FAN_TARGET_LO 0x4c
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#define REG_FAN_TARGET_HI 0x4d
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#define REG_FAN_TACH_HI 0x4e
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#define REG_FAN_TACH_LO 0x4f
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#define REG_PRODUCT_ID 0xfd
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#define REG_MFG_ID 0xfe
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/* equation 4 from datasheet: rpm = (3932160 * multipler) / count */
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#define FAN_RPM_FACTOR 3932160
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/*
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* 2103-2 and 2103-4's 3rd temperature sensor can be connected to two diodes
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* in anti-parallel mode, and in this configuration both can be read
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* independently (so we have 4 temperature inputs). The device can't
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* detect if it's connected in this mode, so we have to manually enable
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* it. Default is to leave the device in the state it's already in (-1).
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* This parameter allows APD mode to be optionally forced on or off
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*/
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static int apd = -1;
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module_param(apd, bint, 0);
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MODULE_PARM_DESC(apd, "Set to zero to disable anti-parallel diode mode");
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struct temperature {
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s8 degrees;
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u8 fraction; /* 0-7 multiples of 0.125 */
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};
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struct emc2103_data {
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struct i2c_client *client;
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const struct attribute_group *groups[4];
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struct mutex update_lock;
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bool valid; /* registers are valid */
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bool fan_rpm_control;
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int temp_count; /* num of temp sensors */
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unsigned long last_updated; /* in jiffies */
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struct temperature temp[4]; /* internal + 3 external */
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s8 temp_min[4]; /* no fractional part */
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s8 temp_max[4]; /* no fractional part */
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u8 temp_min_alarm;
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u8 temp_max_alarm;
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u8 fan_multiplier;
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u16 fan_tach;
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u16 fan_target;
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};
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static int read_u8_from_i2c(struct i2c_client *client, u8 i2c_reg, u8 *output)
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{
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int status = i2c_smbus_read_byte_data(client, i2c_reg);
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if (status < 0) {
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dev_warn(&client->dev, "reg 0x%02x, err %d\n",
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i2c_reg, status);
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} else {
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*output = status;
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}
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return status;
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}
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static void read_temp_from_i2c(struct i2c_client *client, u8 i2c_reg,
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struct temperature *temp)
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{
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u8 degrees, fractional;
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if (read_u8_from_i2c(client, i2c_reg, °rees) < 0)
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return;
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if (read_u8_from_i2c(client, i2c_reg + 1, &fractional) < 0)
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return;
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temp->degrees = degrees;
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temp->fraction = (fractional & 0xe0) >> 5;
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}
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static void read_fan_from_i2c(struct i2c_client *client, u16 *output,
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u8 hi_addr, u8 lo_addr)
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{
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u8 high_byte, lo_byte;
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if (read_u8_from_i2c(client, hi_addr, &high_byte) < 0)
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return;
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if (read_u8_from_i2c(client, lo_addr, &lo_byte) < 0)
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return;
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*output = ((u16)high_byte << 5) | (lo_byte >> 3);
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}
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static void write_fan_target_to_i2c(struct i2c_client *client, u16 new_target)
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{
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u8 high_byte = (new_target & 0x1fe0) >> 5;
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u8 low_byte = (new_target & 0x001f) << 3;
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i2c_smbus_write_byte_data(client, REG_FAN_TARGET_LO, low_byte);
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i2c_smbus_write_byte_data(client, REG_FAN_TARGET_HI, high_byte);
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}
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static void read_fan_config_from_i2c(struct i2c_client *client)
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{
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struct emc2103_data *data = i2c_get_clientdata(client);
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u8 conf1;
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if (read_u8_from_i2c(client, REG_FAN_CONF1, &conf1) < 0)
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return;
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data->fan_multiplier = 1 << ((conf1 & 0x60) >> 5);
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data->fan_rpm_control = (conf1 & 0x80) != 0;
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}
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static struct emc2103_data *emc2103_update_device(struct device *dev)
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{
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struct emc2103_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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mutex_lock(&data->update_lock);
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if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
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|| !data->valid) {
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int i;
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for (i = 0; i < data->temp_count; i++) {
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read_temp_from_i2c(client, REG_TEMP[i], &data->temp[i]);
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read_u8_from_i2c(client, REG_TEMP_MIN[i],
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&data->temp_min[i]);
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read_u8_from_i2c(client, REG_TEMP_MAX[i],
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&data->temp_max[i]);
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}
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read_u8_from_i2c(client, REG_TEMP_MIN_ALARM,
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&data->temp_min_alarm);
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read_u8_from_i2c(client, REG_TEMP_MAX_ALARM,
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&data->temp_max_alarm);
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read_fan_from_i2c(client, &data->fan_tach,
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REG_FAN_TACH_HI, REG_FAN_TACH_LO);
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read_fan_from_i2c(client, &data->fan_target,
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REG_FAN_TARGET_HI, REG_FAN_TARGET_LO);
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read_fan_config_from_i2c(client);
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data->last_updated = jiffies;
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data->valid = true;
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}
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mutex_unlock(&data->update_lock);
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return data;
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}
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static ssize_t
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temp_show(struct device *dev, struct device_attribute *da, char *buf)
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{
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int nr = to_sensor_dev_attr(da)->index;
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struct emc2103_data *data = emc2103_update_device(dev);
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int millidegrees = data->temp[nr].degrees * 1000
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+ data->temp[nr].fraction * 125;
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return sprintf(buf, "%d\n", millidegrees);
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}
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static ssize_t
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temp_min_show(struct device *dev, struct device_attribute *da, char *buf)
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{
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int nr = to_sensor_dev_attr(da)->index;
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struct emc2103_data *data = emc2103_update_device(dev);
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int millidegrees = data->temp_min[nr] * 1000;
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return sprintf(buf, "%d\n", millidegrees);
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}
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static ssize_t
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temp_max_show(struct device *dev, struct device_attribute *da, char *buf)
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{
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int nr = to_sensor_dev_attr(da)->index;
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struct emc2103_data *data = emc2103_update_device(dev);
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int millidegrees = data->temp_max[nr] * 1000;
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return sprintf(buf, "%d\n", millidegrees);
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}
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static ssize_t
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temp_fault_show(struct device *dev, struct device_attribute *da, char *buf)
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{
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int nr = to_sensor_dev_attr(da)->index;
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struct emc2103_data *data = emc2103_update_device(dev);
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bool fault = (data->temp[nr].degrees == -128);
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return sprintf(buf, "%d\n", fault ? 1 : 0);
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}
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static ssize_t
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temp_min_alarm_show(struct device *dev, struct device_attribute *da,
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char *buf)
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{
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int nr = to_sensor_dev_attr(da)->index;
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struct emc2103_data *data = emc2103_update_device(dev);
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bool alarm = data->temp_min_alarm & (1 << nr);
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return sprintf(buf, "%d\n", alarm ? 1 : 0);
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}
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static ssize_t
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temp_max_alarm_show(struct device *dev, struct device_attribute *da,
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char *buf)
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{
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int nr = to_sensor_dev_attr(da)->index;
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struct emc2103_data *data = emc2103_update_device(dev);
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bool alarm = data->temp_max_alarm & (1 << nr);
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return sprintf(buf, "%d\n", alarm ? 1 : 0);
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}
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static ssize_t temp_min_store(struct device *dev, struct device_attribute *da,
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const char *buf, size_t count)
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{
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int nr = to_sensor_dev_attr(da)->index;
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struct emc2103_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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long val;
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int result = kstrtol(buf, 10, &val);
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if (result < 0)
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return result;
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val = DIV_ROUND_CLOSEST(clamp_val(val, -63000, 127000), 1000);
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mutex_lock(&data->update_lock);
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data->temp_min[nr] = val;
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i2c_smbus_write_byte_data(client, REG_TEMP_MIN[nr], val);
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mutex_unlock(&data->update_lock);
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return count;
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}
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static ssize_t temp_max_store(struct device *dev, struct device_attribute *da,
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const char *buf, size_t count)
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{
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int nr = to_sensor_dev_attr(da)->index;
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struct emc2103_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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long val;
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int result = kstrtol(buf, 10, &val);
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if (result < 0)
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return result;
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val = DIV_ROUND_CLOSEST(clamp_val(val, -63000, 127000), 1000);
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mutex_lock(&data->update_lock);
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data->temp_max[nr] = val;
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i2c_smbus_write_byte_data(client, REG_TEMP_MAX[nr], val);
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mutex_unlock(&data->update_lock);
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return count;
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}
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static ssize_t
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fan1_input_show(struct device *dev, struct device_attribute *da, char *buf)
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{
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struct emc2103_data *data = emc2103_update_device(dev);
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int rpm = 0;
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if (data->fan_tach != 0)
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rpm = (FAN_RPM_FACTOR * data->fan_multiplier) / data->fan_tach;
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return sprintf(buf, "%d\n", rpm);
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}
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static ssize_t
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fan1_div_show(struct device *dev, struct device_attribute *da, char *buf)
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{
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struct emc2103_data *data = emc2103_update_device(dev);
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int fan_div = 8 / data->fan_multiplier;
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return sprintf(buf, "%d\n", fan_div);
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}
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/*
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* Note: we also update the fan target here, because its value is
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* determined in part by the fan clock divider. This follows the principle
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* of least surprise; the user doesn't expect the fan target to change just
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* because the divider changed.
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*/
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static ssize_t fan1_div_store(struct device *dev, struct device_attribute *da,
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const char *buf, size_t count)
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{
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struct emc2103_data *data = emc2103_update_device(dev);
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struct i2c_client *client = data->client;
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int new_range_bits, old_div = 8 / data->fan_multiplier;
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long new_div;
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int status = kstrtol(buf, 10, &new_div);
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if (status < 0)
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return status;
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if (new_div == old_div) /* No change */
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return count;
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switch (new_div) {
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case 1:
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new_range_bits = 3;
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break;
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case 2:
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new_range_bits = 2;
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break;
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case 4:
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new_range_bits = 1;
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break;
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case 8:
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new_range_bits = 0;
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break;
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default:
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return -EINVAL;
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}
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mutex_lock(&data->update_lock);
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status = i2c_smbus_read_byte_data(client, REG_FAN_CONF1);
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if (status < 0) {
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dev_dbg(&client->dev, "reg 0x%02x, err %d\n",
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REG_FAN_CONF1, status);
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mutex_unlock(&data->update_lock);
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return status;
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}
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status &= 0x9F;
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status |= (new_range_bits << 5);
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i2c_smbus_write_byte_data(client, REG_FAN_CONF1, status);
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data->fan_multiplier = 8 / new_div;
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/* update fan target if high byte is not disabled */
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if ((data->fan_target & 0x1fe0) != 0x1fe0) {
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u16 new_target = (data->fan_target * old_div) / new_div;
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data->fan_target = min(new_target, (u16)0x1fff);
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write_fan_target_to_i2c(client, data->fan_target);
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}
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/* invalidate data to force re-read from hardware */
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data->valid = false;
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mutex_unlock(&data->update_lock);
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return count;
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}
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static ssize_t
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fan1_target_show(struct device *dev, struct device_attribute *da, char *buf)
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{
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struct emc2103_data *data = emc2103_update_device(dev);
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int rpm = 0;
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/* high byte of 0xff indicates disabled so return 0 */
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if ((data->fan_target != 0) && ((data->fan_target & 0x1fe0) != 0x1fe0))
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rpm = (FAN_RPM_FACTOR * data->fan_multiplier)
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/ data->fan_target;
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return sprintf(buf, "%d\n", rpm);
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}
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static ssize_t fan1_target_store(struct device *dev,
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struct device_attribute *da, const char *buf,
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size_t count)
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{
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struct emc2103_data *data = emc2103_update_device(dev);
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struct i2c_client *client = data->client;
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unsigned long rpm_target;
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int result = kstrtoul(buf, 10, &rpm_target);
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if (result < 0)
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return result;
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/* Datasheet states 16384 as maximum RPM target (table 3.2) */
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rpm_target = clamp_val(rpm_target, 0, 16384);
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mutex_lock(&data->update_lock);
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if (rpm_target == 0)
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data->fan_target = 0x1fff;
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else
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data->fan_target = clamp_val(
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(FAN_RPM_FACTOR * data->fan_multiplier) / rpm_target,
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0, 0x1fff);
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write_fan_target_to_i2c(client, data->fan_target);
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mutex_unlock(&data->update_lock);
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return count;
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}
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static ssize_t
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fan1_fault_show(struct device *dev, struct device_attribute *da, char *buf)
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{
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struct emc2103_data *data = emc2103_update_device(dev);
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bool fault = ((data->fan_tach & 0x1fe0) == 0x1fe0);
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return sprintf(buf, "%d\n", fault ? 1 : 0);
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}
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static ssize_t
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pwm1_enable_show(struct device *dev, struct device_attribute *da, char *buf)
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{
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struct emc2103_data *data = emc2103_update_device(dev);
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return sprintf(buf, "%d\n", data->fan_rpm_control ? 3 : 0);
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}
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static ssize_t pwm1_enable_store(struct device *dev,
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struct device_attribute *da, const char *buf,
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size_t count)
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{
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struct emc2103_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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long new_value;
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u8 conf_reg;
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int result = kstrtol(buf, 10, &new_value);
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if (result < 0)
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return result;
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mutex_lock(&data->update_lock);
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switch (new_value) {
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case 0:
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data->fan_rpm_control = false;
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break;
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case 3:
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data->fan_rpm_control = true;
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break;
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default:
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count = -EINVAL;
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goto err;
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}
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result = read_u8_from_i2c(client, REG_FAN_CONF1, &conf_reg);
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if (result < 0) {
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count = result;
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goto err;
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}
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if (data->fan_rpm_control)
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conf_reg |= 0x80;
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else
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conf_reg &= ~0x80;
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i2c_smbus_write_byte_data(client, REG_FAN_CONF1, conf_reg);
|
err:
|
mutex_unlock(&data->update_lock);
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return count;
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}
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static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0);
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static SENSOR_DEVICE_ATTR_RW(temp1_min, temp_min, 0);
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static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_max, 0);
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static SENSOR_DEVICE_ATTR_RO(temp1_fault, temp_fault, 0);
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static SENSOR_DEVICE_ATTR_RO(temp1_min_alarm, temp_min_alarm, 0);
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static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, temp_max_alarm, 0);
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static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1);
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static SENSOR_DEVICE_ATTR_RW(temp2_min, temp_min, 1);
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static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_max, 1);
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static SENSOR_DEVICE_ATTR_RO(temp2_fault, temp_fault, 1);
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static SENSOR_DEVICE_ATTR_RO(temp2_min_alarm, temp_min_alarm, 1);
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static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, temp_max_alarm, 1);
|
|
static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 2);
|
static SENSOR_DEVICE_ATTR_RW(temp3_min, temp_min, 2);
|
static SENSOR_DEVICE_ATTR_RW(temp3_max, temp_max, 2);
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static SENSOR_DEVICE_ATTR_RO(temp3_fault, temp_fault, 2);
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static SENSOR_DEVICE_ATTR_RO(temp3_min_alarm, temp_min_alarm, 2);
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static SENSOR_DEVICE_ATTR_RO(temp3_max_alarm, temp_max_alarm, 2);
|
|
static SENSOR_DEVICE_ATTR_RO(temp4_input, temp, 3);
|
static SENSOR_DEVICE_ATTR_RW(temp4_min, temp_min, 3);
|
static SENSOR_DEVICE_ATTR_RW(temp4_max, temp_max, 3);
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static SENSOR_DEVICE_ATTR_RO(temp4_fault, temp_fault, 3);
|
static SENSOR_DEVICE_ATTR_RO(temp4_min_alarm, temp_min_alarm, 3);
|
static SENSOR_DEVICE_ATTR_RO(temp4_max_alarm, temp_max_alarm, 3);
|
|
static DEVICE_ATTR_RO(fan1_input);
|
static DEVICE_ATTR_RW(fan1_div);
|
static DEVICE_ATTR_RW(fan1_target);
|
static DEVICE_ATTR_RO(fan1_fault);
|
|
static DEVICE_ATTR_RW(pwm1_enable);
|
|
/* sensors present on all models */
|
static struct attribute *emc2103_attributes[] = {
|
&sensor_dev_attr_temp1_input.dev_attr.attr,
|
&sensor_dev_attr_temp1_min.dev_attr.attr,
|
&sensor_dev_attr_temp1_max.dev_attr.attr,
|
&sensor_dev_attr_temp1_fault.dev_attr.attr,
|
&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
|
&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
|
&sensor_dev_attr_temp2_input.dev_attr.attr,
|
&sensor_dev_attr_temp2_min.dev_attr.attr,
|
&sensor_dev_attr_temp2_max.dev_attr.attr,
|
&sensor_dev_attr_temp2_fault.dev_attr.attr,
|
&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
|
&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
|
&dev_attr_fan1_input.attr,
|
&dev_attr_fan1_div.attr,
|
&dev_attr_fan1_target.attr,
|
&dev_attr_fan1_fault.attr,
|
&dev_attr_pwm1_enable.attr,
|
NULL
|
};
|
|
/* extra temperature sensors only present on 2103-2 and 2103-4 */
|
static struct attribute *emc2103_attributes_temp3[] = {
|
&sensor_dev_attr_temp3_input.dev_attr.attr,
|
&sensor_dev_attr_temp3_min.dev_attr.attr,
|
&sensor_dev_attr_temp3_max.dev_attr.attr,
|
&sensor_dev_attr_temp3_fault.dev_attr.attr,
|
&sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
|
&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
|
NULL
|
};
|
|
/* extra temperature sensors only present on 2103-2 and 2103-4 in APD mode */
|
static struct attribute *emc2103_attributes_temp4[] = {
|
&sensor_dev_attr_temp4_input.dev_attr.attr,
|
&sensor_dev_attr_temp4_min.dev_attr.attr,
|
&sensor_dev_attr_temp4_max.dev_attr.attr,
|
&sensor_dev_attr_temp4_fault.dev_attr.attr,
|
&sensor_dev_attr_temp4_min_alarm.dev_attr.attr,
|
&sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
|
NULL
|
};
|
|
static const struct attribute_group emc2103_group = {
|
.attrs = emc2103_attributes,
|
};
|
|
static const struct attribute_group emc2103_temp3_group = {
|
.attrs = emc2103_attributes_temp3,
|
};
|
|
static const struct attribute_group emc2103_temp4_group = {
|
.attrs = emc2103_attributes_temp4,
|
};
|
|
static int
|
emc2103_probe(struct i2c_client *client)
|
{
|
struct emc2103_data *data;
|
struct device *hwmon_dev;
|
int status, idx = 0;
|
|
if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
|
return -EIO;
|
|
data = devm_kzalloc(&client->dev, sizeof(struct emc2103_data),
|
GFP_KERNEL);
|
if (!data)
|
return -ENOMEM;
|
|
i2c_set_clientdata(client, data);
|
data->client = client;
|
mutex_init(&data->update_lock);
|
|
/* 2103-2 and 2103-4 have 3 external diodes, 2103-1 has 1 */
|
status = i2c_smbus_read_byte_data(client, REG_PRODUCT_ID);
|
if (status == 0x24) {
|
/* 2103-1 only has 1 external diode */
|
data->temp_count = 2;
|
} else {
|
/* 2103-2 and 2103-4 have 3 or 4 external diodes */
|
status = i2c_smbus_read_byte_data(client, REG_CONF1);
|
if (status < 0) {
|
dev_dbg(&client->dev, "reg 0x%02x, err %d\n", REG_CONF1,
|
status);
|
return status;
|
}
|
|
/* detect current state of hardware */
|
data->temp_count = (status & 0x01) ? 4 : 3;
|
|
/* force APD state if module parameter is set */
|
if (apd == 0) {
|
/* force APD mode off */
|
data->temp_count = 3;
|
status &= ~(0x01);
|
i2c_smbus_write_byte_data(client, REG_CONF1, status);
|
} else if (apd == 1) {
|
/* force APD mode on */
|
data->temp_count = 4;
|
status |= 0x01;
|
i2c_smbus_write_byte_data(client, REG_CONF1, status);
|
}
|
}
|
|
/* sysfs hooks */
|
data->groups[idx++] = &emc2103_group;
|
if (data->temp_count >= 3)
|
data->groups[idx++] = &emc2103_temp3_group;
|
if (data->temp_count == 4)
|
data->groups[idx++] = &emc2103_temp4_group;
|
|
hwmon_dev = devm_hwmon_device_register_with_groups(&client->dev,
|
client->name, data,
|
data->groups);
|
if (IS_ERR(hwmon_dev))
|
return PTR_ERR(hwmon_dev);
|
|
dev_info(&client->dev, "%s: sensor '%s'\n",
|
dev_name(hwmon_dev), client->name);
|
|
return 0;
|
}
|
|
static const struct i2c_device_id emc2103_ids[] = {
|
{ "emc2103", 0, },
|
{ /* LIST END */ }
|
};
|
MODULE_DEVICE_TABLE(i2c, emc2103_ids);
|
|
/* Return 0 if detection is successful, -ENODEV otherwise */
|
static int
|
emc2103_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, REG_MFG_ID);
|
if (manufacturer != 0x5D)
|
return -ENODEV;
|
|
product = i2c_smbus_read_byte_data(new_client, REG_PRODUCT_ID);
|
if ((product != 0x24) && (product != 0x26))
|
return -ENODEV;
|
|
strlcpy(info->type, "emc2103", I2C_NAME_SIZE);
|
|
return 0;
|
}
|
|
static struct i2c_driver emc2103_driver = {
|
.class = I2C_CLASS_HWMON,
|
.driver = {
|
.name = "emc2103",
|
},
|
.probe_new = emc2103_probe,
|
.id_table = emc2103_ids,
|
.detect = emc2103_detect,
|
.address_list = normal_i2c,
|
};
|
|
module_i2c_driver(emc2103_driver);
|
|
MODULE_AUTHOR("Steve Glendinning <steve.glendinning@shawell.net>");
|
MODULE_DESCRIPTION("SMSC EMC2103 hwmon driver");
|
MODULE_LICENSE("GPL");
|
