![Stephen Kitt](/assets/img/avatar_default.png)
Many hwmon drivers don't use the id information provided by the old i2c probe function, and the remainder can easily be adapted to the new form ("probe_new") by calling i2c_match_id explicitly. This avoids scanning the identifier tables during probes. Drivers which didn't use the id are converted as-is; drivers which did are modified as follows: * if the information in i2c_client is sufficient, that's used instead (client->name); * anything else is handled by calling i2c_match_id() with the same level of error-handling (if any) as before. A few drivers aren't included in this patch because they have a different set of maintainers. They will be covered by other patches. Signed-off-by: Stephen Kitt <steve@sk2.org> Link: https://lore.kernel.org/r/20200813160222.1503401-1-steve@sk2.org Signed-off-by: Guenter Roeck <linux@roeck-us.net>
594 lines
17 KiB
C
594 lines
17 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* max6639.c - Support for Maxim MAX6639
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*
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* 2-Channel Temperature Monitor with Dual PWM Fan-Speed Controller
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*
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* Copyright (C) 2010, 2011 Roland Stigge <stigge@antcom.de>
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*
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* based on the initial MAX6639 support from semptian.net
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* by He Changqing <hechangqing@semptian.com>
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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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#include <linux/platform_data/max6639.h>
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/* Addresses to scan */
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static const unsigned short normal_i2c[] = { 0x2c, 0x2e, 0x2f, I2C_CLIENT_END };
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/* The MAX6639 registers, valid channel numbers: 0, 1 */
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#define MAX6639_REG_TEMP(ch) (0x00 + (ch))
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#define MAX6639_REG_STATUS 0x02
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#define MAX6639_REG_OUTPUT_MASK 0x03
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#define MAX6639_REG_GCONFIG 0x04
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#define MAX6639_REG_TEMP_EXT(ch) (0x05 + (ch))
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#define MAX6639_REG_ALERT_LIMIT(ch) (0x08 + (ch))
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#define MAX6639_REG_OT_LIMIT(ch) (0x0A + (ch))
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#define MAX6639_REG_THERM_LIMIT(ch) (0x0C + (ch))
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#define MAX6639_REG_FAN_CONFIG1(ch) (0x10 + (ch) * 4)
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#define MAX6639_REG_FAN_CONFIG2a(ch) (0x11 + (ch) * 4)
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#define MAX6639_REG_FAN_CONFIG2b(ch) (0x12 + (ch) * 4)
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#define MAX6639_REG_FAN_CONFIG3(ch) (0x13 + (ch) * 4)
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#define MAX6639_REG_FAN_CNT(ch) (0x20 + (ch))
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#define MAX6639_REG_TARGET_CNT(ch) (0x22 + (ch))
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#define MAX6639_REG_FAN_PPR(ch) (0x24 + (ch))
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#define MAX6639_REG_TARGTDUTY(ch) (0x26 + (ch))
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#define MAX6639_REG_FAN_START_TEMP(ch) (0x28 + (ch))
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#define MAX6639_REG_DEVID 0x3D
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#define MAX6639_REG_MANUID 0x3E
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#define MAX6639_REG_DEVREV 0x3F
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/* Register bits */
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#define MAX6639_GCONFIG_STANDBY 0x80
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#define MAX6639_GCONFIG_POR 0x40
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#define MAX6639_GCONFIG_DISABLE_TIMEOUT 0x20
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#define MAX6639_GCONFIG_CH2_LOCAL 0x10
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#define MAX6639_GCONFIG_PWM_FREQ_HI 0x08
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#define MAX6639_FAN_CONFIG1_PWM 0x80
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#define MAX6639_FAN_CONFIG3_THERM_FULL_SPEED 0x40
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static const int rpm_ranges[] = { 2000, 4000, 8000, 16000 };
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#define FAN_FROM_REG(val, rpm_range) ((val) == 0 || (val) == 255 ? \
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0 : (rpm_ranges[rpm_range] * 30) / (val))
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#define TEMP_LIMIT_TO_REG(val) clamp_val((val) / 1000, 0, 255)
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/*
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* Client data (each client gets its own)
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*/
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struct max6639_data {
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struct i2c_client *client;
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struct mutex update_lock;
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char valid; /* !=0 if following fields are valid */
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unsigned long last_updated; /* In jiffies */
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/* Register values sampled regularly */
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u16 temp[2]; /* Temperature, in 1/8 C, 0..255 C */
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bool temp_fault[2]; /* Detected temperature diode failure */
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u8 fan[2]; /* Register value: TACH count for fans >=30 */
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u8 status; /* Detected channel alarms and fan failures */
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/* Register values only written to */
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u8 pwm[2]; /* Register value: Duty cycle 0..120 */
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u8 temp_therm[2]; /* THERM Temperature, 0..255 C (->_max) */
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u8 temp_alert[2]; /* ALERT Temperature, 0..255 C (->_crit) */
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u8 temp_ot[2]; /* OT Temperature, 0..255 C (->_emergency) */
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/* Register values initialized only once */
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u8 ppr; /* Pulses per rotation 0..3 for 1..4 ppr */
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u8 rpm_range; /* Index in above rpm_ranges table */
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};
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static struct max6639_data *max6639_update_device(struct device *dev)
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{
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struct max6639_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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struct max6639_data *ret = data;
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int i;
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int status_reg;
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mutex_lock(&data->update_lock);
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if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
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int res;
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dev_dbg(&client->dev, "Starting max6639 update\n");
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status_reg = i2c_smbus_read_byte_data(client,
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MAX6639_REG_STATUS);
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if (status_reg < 0) {
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ret = ERR_PTR(status_reg);
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goto abort;
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}
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data->status = status_reg;
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for (i = 0; i < 2; i++) {
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res = i2c_smbus_read_byte_data(client,
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MAX6639_REG_FAN_CNT(i));
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if (res < 0) {
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ret = ERR_PTR(res);
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goto abort;
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}
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data->fan[i] = res;
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res = i2c_smbus_read_byte_data(client,
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MAX6639_REG_TEMP_EXT(i));
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if (res < 0) {
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ret = ERR_PTR(res);
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goto abort;
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}
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data->temp[i] = res >> 5;
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data->temp_fault[i] = res & 0x01;
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res = i2c_smbus_read_byte_data(client,
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MAX6639_REG_TEMP(i));
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if (res < 0) {
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ret = ERR_PTR(res);
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goto abort;
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}
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data->temp[i] |= res << 3;
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}
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data->last_updated = jiffies;
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data->valid = 1;
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}
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abort:
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mutex_unlock(&data->update_lock);
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return ret;
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}
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static ssize_t temp_input_show(struct device *dev,
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struct device_attribute *dev_attr, char *buf)
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{
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long temp;
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struct max6639_data *data = max6639_update_device(dev);
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struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
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if (IS_ERR(data))
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return PTR_ERR(data);
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temp = data->temp[attr->index] * 125;
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return sprintf(buf, "%ld\n", temp);
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}
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static ssize_t temp_fault_show(struct device *dev,
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struct device_attribute *dev_attr, char *buf)
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{
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struct max6639_data *data = max6639_update_device(dev);
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struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
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if (IS_ERR(data))
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return PTR_ERR(data);
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return sprintf(buf, "%d\n", data->temp_fault[attr->index]);
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}
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static ssize_t temp_max_show(struct device *dev,
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struct device_attribute *dev_attr, char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
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struct max6639_data *data = dev_get_drvdata(dev);
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return sprintf(buf, "%d\n", (data->temp_therm[attr->index] * 1000));
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}
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static ssize_t temp_max_store(struct device *dev,
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struct device_attribute *dev_attr,
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const char *buf, size_t count)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
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struct max6639_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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unsigned long val;
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int res;
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res = kstrtoul(buf, 10, &val);
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if (res)
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return res;
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mutex_lock(&data->update_lock);
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data->temp_therm[attr->index] = TEMP_LIMIT_TO_REG(val);
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i2c_smbus_write_byte_data(client,
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MAX6639_REG_THERM_LIMIT(attr->index),
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data->temp_therm[attr->index]);
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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_crit_show(struct device *dev,
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struct device_attribute *dev_attr, char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
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struct max6639_data *data = dev_get_drvdata(dev);
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return sprintf(buf, "%d\n", (data->temp_alert[attr->index] * 1000));
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}
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static ssize_t temp_crit_store(struct device *dev,
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struct device_attribute *dev_attr,
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const char *buf, size_t count)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
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struct max6639_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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unsigned long val;
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int res;
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res = kstrtoul(buf, 10, &val);
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if (res)
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return res;
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mutex_lock(&data->update_lock);
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data->temp_alert[attr->index] = TEMP_LIMIT_TO_REG(val);
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i2c_smbus_write_byte_data(client,
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MAX6639_REG_ALERT_LIMIT(attr->index),
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data->temp_alert[attr->index]);
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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_emergency_show(struct device *dev,
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struct device_attribute *dev_attr,
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char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
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struct max6639_data *data = dev_get_drvdata(dev);
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return sprintf(buf, "%d\n", (data->temp_ot[attr->index] * 1000));
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}
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static ssize_t temp_emergency_store(struct device *dev,
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struct device_attribute *dev_attr,
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const char *buf, size_t count)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
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struct max6639_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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unsigned long val;
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int res;
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res = kstrtoul(buf, 10, &val);
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if (res)
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return res;
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mutex_lock(&data->update_lock);
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data->temp_ot[attr->index] = TEMP_LIMIT_TO_REG(val);
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i2c_smbus_write_byte_data(client,
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MAX6639_REG_OT_LIMIT(attr->index),
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data->temp_ot[attr->index]);
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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 pwm_show(struct device *dev, struct device_attribute *dev_attr,
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char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
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struct max6639_data *data = dev_get_drvdata(dev);
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return sprintf(buf, "%d\n", data->pwm[attr->index] * 255 / 120);
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}
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static ssize_t pwm_store(struct device *dev,
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struct device_attribute *dev_attr, const char *buf,
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size_t count)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
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struct max6639_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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unsigned long val;
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int res;
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res = kstrtoul(buf, 10, &val);
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if (res)
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return res;
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val = clamp_val(val, 0, 255);
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mutex_lock(&data->update_lock);
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data->pwm[attr->index] = (u8)(val * 120 / 255);
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i2c_smbus_write_byte_data(client,
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MAX6639_REG_TARGTDUTY(attr->index),
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data->pwm[attr->index]);
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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 fan_input_show(struct device *dev,
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struct device_attribute *dev_attr, char *buf)
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{
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struct max6639_data *data = max6639_update_device(dev);
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struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
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if (IS_ERR(data))
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return PTR_ERR(data);
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return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index],
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data->rpm_range));
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}
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static ssize_t alarm_show(struct device *dev,
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struct device_attribute *dev_attr, char *buf)
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{
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struct max6639_data *data = max6639_update_device(dev);
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struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
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if (IS_ERR(data))
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return PTR_ERR(data);
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return sprintf(buf, "%d\n", !!(data->status & (1 << attr->index)));
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}
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static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0);
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static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_input, 1);
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static SENSOR_DEVICE_ATTR_RO(temp1_fault, temp_fault, 0);
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static SENSOR_DEVICE_ATTR_RO(temp2_fault, temp_fault, 1);
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static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_max, 0);
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static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_max, 1);
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static SENSOR_DEVICE_ATTR_RW(temp1_crit, temp_crit, 0);
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static SENSOR_DEVICE_ATTR_RW(temp2_crit, temp_crit, 1);
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static SENSOR_DEVICE_ATTR_RW(temp1_emergency, temp_emergency, 0);
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static SENSOR_DEVICE_ATTR_RW(temp2_emergency, temp_emergency, 1);
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static SENSOR_DEVICE_ATTR_RW(pwm1, pwm, 0);
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static SENSOR_DEVICE_ATTR_RW(pwm2, pwm, 1);
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static SENSOR_DEVICE_ATTR_RO(fan1_input, fan_input, 0);
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static SENSOR_DEVICE_ATTR_RO(fan2_input, fan_input, 1);
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static SENSOR_DEVICE_ATTR_RO(fan1_fault, alarm, 1);
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static SENSOR_DEVICE_ATTR_RO(fan2_fault, alarm, 0);
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static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 3);
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static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 2);
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static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 7);
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static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, 6);
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static SENSOR_DEVICE_ATTR_RO(temp1_emergency_alarm, alarm, 5);
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static SENSOR_DEVICE_ATTR_RO(temp2_emergency_alarm, alarm, 4);
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static struct attribute *max6639_attrs[] = {
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&sensor_dev_attr_temp1_input.dev_attr.attr,
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&sensor_dev_attr_temp2_input.dev_attr.attr,
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&sensor_dev_attr_temp1_fault.dev_attr.attr,
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&sensor_dev_attr_temp2_fault.dev_attr.attr,
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&sensor_dev_attr_temp1_max.dev_attr.attr,
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&sensor_dev_attr_temp2_max.dev_attr.attr,
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&sensor_dev_attr_temp1_crit.dev_attr.attr,
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&sensor_dev_attr_temp2_crit.dev_attr.attr,
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&sensor_dev_attr_temp1_emergency.dev_attr.attr,
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&sensor_dev_attr_temp2_emergency.dev_attr.attr,
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&sensor_dev_attr_pwm1.dev_attr.attr,
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&sensor_dev_attr_pwm2.dev_attr.attr,
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&sensor_dev_attr_fan1_input.dev_attr.attr,
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&sensor_dev_attr_fan2_input.dev_attr.attr,
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&sensor_dev_attr_fan1_fault.dev_attr.attr,
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&sensor_dev_attr_fan2_fault.dev_attr.attr,
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&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
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&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
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&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
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&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
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&sensor_dev_attr_temp1_emergency_alarm.dev_attr.attr,
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&sensor_dev_attr_temp2_emergency_alarm.dev_attr.attr,
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NULL
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};
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ATTRIBUTE_GROUPS(max6639);
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/*
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* returns respective index in rpm_ranges table
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* 1 by default on invalid range
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*/
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static int rpm_range_to_reg(int range)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(rpm_ranges); i++) {
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if (rpm_ranges[i] == range)
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return i;
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}
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return 1; /* default: 4000 RPM */
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}
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static int max6639_init_client(struct i2c_client *client,
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struct max6639_data *data)
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{
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struct max6639_platform_data *max6639_info =
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dev_get_platdata(&client->dev);
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int i;
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int rpm_range = 1; /* default: 4000 RPM */
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int err;
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/* Reset chip to default values, see below for GCONFIG setup */
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err = i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG,
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MAX6639_GCONFIG_POR);
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if (err)
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goto exit;
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/* Fans pulse per revolution is 2 by default */
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if (max6639_info && max6639_info->ppr > 0 &&
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max6639_info->ppr < 5)
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data->ppr = max6639_info->ppr;
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else
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data->ppr = 2;
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data->ppr -= 1;
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if (max6639_info)
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rpm_range = rpm_range_to_reg(max6639_info->rpm_range);
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data->rpm_range = rpm_range;
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for (i = 0; i < 2; i++) {
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/* Set Fan pulse per revolution */
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err = i2c_smbus_write_byte_data(client,
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MAX6639_REG_FAN_PPR(i),
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data->ppr << 6);
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if (err)
|
|
goto exit;
|
|
|
|
/* Fans config PWM, RPM */
|
|
err = i2c_smbus_write_byte_data(client,
|
|
MAX6639_REG_FAN_CONFIG1(i),
|
|
MAX6639_FAN_CONFIG1_PWM | rpm_range);
|
|
if (err)
|
|
goto exit;
|
|
|
|
/* Fans PWM polarity high by default */
|
|
if (max6639_info && max6639_info->pwm_polarity == 0)
|
|
err = i2c_smbus_write_byte_data(client,
|
|
MAX6639_REG_FAN_CONFIG2a(i), 0x00);
|
|
else
|
|
err = i2c_smbus_write_byte_data(client,
|
|
MAX6639_REG_FAN_CONFIG2a(i), 0x02);
|
|
if (err)
|
|
goto exit;
|
|
|
|
/*
|
|
* /THERM full speed enable,
|
|
* PWM frequency 25kHz, see also GCONFIG below
|
|
*/
|
|
err = i2c_smbus_write_byte_data(client,
|
|
MAX6639_REG_FAN_CONFIG3(i),
|
|
MAX6639_FAN_CONFIG3_THERM_FULL_SPEED | 0x03);
|
|
if (err)
|
|
goto exit;
|
|
|
|
/* Max. temp. 80C/90C/100C */
|
|
data->temp_therm[i] = 80;
|
|
data->temp_alert[i] = 90;
|
|
data->temp_ot[i] = 100;
|
|
err = i2c_smbus_write_byte_data(client,
|
|
MAX6639_REG_THERM_LIMIT(i),
|
|
data->temp_therm[i]);
|
|
if (err)
|
|
goto exit;
|
|
err = i2c_smbus_write_byte_data(client,
|
|
MAX6639_REG_ALERT_LIMIT(i),
|
|
data->temp_alert[i]);
|
|
if (err)
|
|
goto exit;
|
|
err = i2c_smbus_write_byte_data(client,
|
|
MAX6639_REG_OT_LIMIT(i), data->temp_ot[i]);
|
|
if (err)
|
|
goto exit;
|
|
|
|
/* PWM 120/120 (i.e. 100%) */
|
|
data->pwm[i] = 120;
|
|
err = i2c_smbus_write_byte_data(client,
|
|
MAX6639_REG_TARGTDUTY(i), data->pwm[i]);
|
|
if (err)
|
|
goto exit;
|
|
}
|
|
/* Start monitoring */
|
|
err = i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG,
|
|
MAX6639_GCONFIG_DISABLE_TIMEOUT | MAX6639_GCONFIG_CH2_LOCAL |
|
|
MAX6639_GCONFIG_PWM_FREQ_HI);
|
|
exit:
|
|
return err;
|
|
}
|
|
|
|
/* Return 0 if detection is successful, -ENODEV otherwise */
|
|
static int max6639_detect(struct i2c_client *client,
|
|
struct i2c_board_info *info)
|
|
{
|
|
struct i2c_adapter *adapter = client->adapter;
|
|
int dev_id, manu_id;
|
|
|
|
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
|
|
return -ENODEV;
|
|
|
|
/* Actual detection via device and manufacturer ID */
|
|
dev_id = i2c_smbus_read_byte_data(client, MAX6639_REG_DEVID);
|
|
manu_id = i2c_smbus_read_byte_data(client, MAX6639_REG_MANUID);
|
|
if (dev_id != 0x58 || manu_id != 0x4D)
|
|
return -ENODEV;
|
|
|
|
strlcpy(info->type, "max6639", I2C_NAME_SIZE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int max6639_probe(struct i2c_client *client)
|
|
{
|
|
struct device *dev = &client->dev;
|
|
struct max6639_data *data;
|
|
struct device *hwmon_dev;
|
|
int err;
|
|
|
|
data = devm_kzalloc(dev, sizeof(struct max6639_data), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
data->client = client;
|
|
mutex_init(&data->update_lock);
|
|
|
|
/* Initialize the max6639 chip */
|
|
err = max6639_init_client(client, data);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
|
|
data,
|
|
max6639_groups);
|
|
return PTR_ERR_OR_ZERO(hwmon_dev);
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int max6639_suspend(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
int data = i2c_smbus_read_byte_data(client, MAX6639_REG_GCONFIG);
|
|
if (data < 0)
|
|
return data;
|
|
|
|
return i2c_smbus_write_byte_data(client,
|
|
MAX6639_REG_GCONFIG, data | MAX6639_GCONFIG_STANDBY);
|
|
}
|
|
|
|
static int max6639_resume(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
int data = i2c_smbus_read_byte_data(client, MAX6639_REG_GCONFIG);
|
|
if (data < 0)
|
|
return data;
|
|
|
|
return i2c_smbus_write_byte_data(client,
|
|
MAX6639_REG_GCONFIG, data & ~MAX6639_GCONFIG_STANDBY);
|
|
}
|
|
#endif /* CONFIG_PM_SLEEP */
|
|
|
|
static const struct i2c_device_id max6639_id[] = {
|
|
{"max6639", 0},
|
|
{ }
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(i2c, max6639_id);
|
|
|
|
static SIMPLE_DEV_PM_OPS(max6639_pm_ops, max6639_suspend, max6639_resume);
|
|
|
|
static struct i2c_driver max6639_driver = {
|
|
.class = I2C_CLASS_HWMON,
|
|
.driver = {
|
|
.name = "max6639",
|
|
.pm = &max6639_pm_ops,
|
|
},
|
|
.probe_new = max6639_probe,
|
|
.id_table = max6639_id,
|
|
.detect = max6639_detect,
|
|
.address_list = normal_i2c,
|
|
};
|
|
|
|
module_i2c_driver(max6639_driver);
|
|
|
|
MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
|
|
MODULE_DESCRIPTION("max6639 driver");
|
|
MODULE_LICENSE("GPL");
|