326 lines
8.7 KiB
C
326 lines
8.7 KiB
C
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/*
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* A hwmon PSU monitoring driver for Juniper QFX5200 platform
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*
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* Copyright (C) 2020 Juniper Networks.
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* Ciju Rajan K <crajank@juniper.net>
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*
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* Based on ym2651.c by Brandon Chuang <brandon_chuang@accton.com.tw>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.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/sysfs.h>
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#include <linux/slab.h>
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#define TEMP_INT_MASK (0xFFC0)
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#define V_IN_INT_MASK (0xFFE0)
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#define V_OUT_INT_MASK (0xFF00)
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#define INVALID_READING (0xFFFF)
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#define TEMP_FR_LEN 6
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#define V_IN_FR_LEN 5
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#define V_OUT_FR_LEN 8
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static const unsigned short normal_i2c[] = { 0x58, 0x58, I2C_CLIENT_END };
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struct psu_data {
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struct device *hwmon_dev;
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struct mutex update_lock;
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char valid; /* !=0 if registers are valid */
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unsigned long last_updated; /* In jiffies */
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u16 v_out;
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u16 i_out;
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u16 v_in;
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u16 i_in;
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u16 temp1_input;
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u16 temp2_input;
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u16 temp3_input;
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u16 temp4_input;
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u16 fan1_input;
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u16 fan2_input;
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};
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static ssize_t show_word(struct device *dev, struct device_attribute *da,
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char *buf);
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static struct psu_data *psu_update_device(struct device *dev);
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enum psu_sysfs_attributes {
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PSU_V_OUT,
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PSU_I_OUT,
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PSU_V_IN,
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PSU_I_IN,
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PSU_TEMP1_INPUT,
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PSU_TEMP2_INPUT,
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PSU_TEMP3_INPUT,
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PSU_TEMP4_INPUT,
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PSU_FAN1_RPM,
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PSU_FAN2_RPM,
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};
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/*
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* sysfs attributes for hwmon
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*/
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static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_word, NULL, PSU_V_OUT);
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static SENSOR_DEVICE_ATTR(curr2_input, S_IRUGO, show_word, NULL, PSU_I_OUT);
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static SENSOR_DEVICE_ATTR(psu_v_in, S_IRUGO, show_word, NULL, PSU_V_IN);
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static SENSOR_DEVICE_ATTR(psu_i_in, S_IRUGO, show_word, NULL, PSU_I_IN);
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static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_word, NULL, PSU_TEMP1_INPUT);
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static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_word, NULL, PSU_TEMP2_INPUT);
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static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_word, NULL, PSU_TEMP3_INPUT);
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static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_word, NULL, PSU_TEMP4_INPUT);
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static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_word, NULL, PSU_FAN1_RPM);
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static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_word, NULL, PSU_FAN2_RPM);
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static struct attribute *psu_attributes[] = {
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&sensor_dev_attr_in3_input.dev_attr.attr,
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&sensor_dev_attr_curr2_input.dev_attr.attr,
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&sensor_dev_attr_psu_v_in.dev_attr.attr,
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&sensor_dev_attr_psu_i_in.dev_attr.attr,
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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_temp3_input.dev_attr.attr,
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&sensor_dev_attr_temp4_input.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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NULL
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};
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static short convert_to_decimal(u16 value,
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u16 data_mask,
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u8 fr_len)
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{
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return (((short)value >= 0) ? ((value & data_mask) >> fr_len) :
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(-((((~(value & data_mask)) >> fr_len) + 1))));
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}
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static ssize_t show_word(struct device *dev, struct device_attribute *da,
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char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
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struct psu_data *data = psu_update_device(dev);
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u32 value = 0x0000;
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switch (attr->index) {
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case PSU_V_OUT:
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value = 1000 * convert_to_decimal(data->v_out,
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V_OUT_INT_MASK,
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V_OUT_FR_LEN);
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break;
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case PSU_V_IN:
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value = convert_to_decimal(data->v_in,
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V_IN_INT_MASK,
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V_IN_FR_LEN);
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break;
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case PSU_I_IN:
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value = data->i_in;
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break;
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case PSU_I_OUT:
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value = 1000 * data->i_out / 64;
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break;
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case PSU_FAN1_RPM:
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value = data->fan1_input;
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break;
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case PSU_FAN2_RPM:
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value = data->fan2_input;
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break;
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case PSU_TEMP1_INPUT:
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value = 1000 * convert_to_decimal(data->temp1_input,
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TEMP_INT_MASK,
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TEMP_FR_LEN);
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break;
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case PSU_TEMP2_INPUT:
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value = 1000 * convert_to_decimal(data->temp2_input,
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TEMP_INT_MASK,
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TEMP_FR_LEN);
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break;
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case PSU_TEMP3_INPUT:
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value = 1000 * convert_to_decimal(data->temp3_input,
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TEMP_INT_MASK,
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TEMP_FR_LEN);
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break;
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case PSU_TEMP4_INPUT:
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value = 1000 * convert_to_decimal(data->temp4_input,
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TEMP_INT_MASK,
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TEMP_FR_LEN);
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break;
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}
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return sprintf(buf, "%d\n", (int)value);
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}
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static const struct attribute_group jnx_psu_group = {
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.attrs = psu_attributes,
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};
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static int jnx_psu_probe(struct i2c_client *client,
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const struct i2c_device_id *dev_id)
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{
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struct psu_data *data;
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int status;
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_BYTE_DATA |
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I2C_FUNC_SMBUS_WORD_DATA |
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I2C_FUNC_SMBUS_I2C_BLOCK)) {
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status = -EIO;
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goto exit;
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}
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data = kzalloc(sizeof(struct psu_data), GFP_KERNEL);
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if (!data) {
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status = -ENOMEM;
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goto exit;
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}
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i2c_set_clientdata(client, data);
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mutex_init(&data->update_lock);
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dev_dbg(&client->dev, "chip found\n");
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/* Register sysfs hooks */
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status = sysfs_create_group(&client->dev.kobj, &jnx_psu_group);
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if (status) {
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goto exit_free;
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}
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data->hwmon_dev = hwmon_device_register(&client->dev);
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if (IS_ERR(data->hwmon_dev)) {
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status = PTR_ERR(data->hwmon_dev);
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goto exit_remove;
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}
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dev_info(&client->dev, "%s: psu '%s'\n",
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dev_name(data->hwmon_dev), client->name);
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return 0;
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exit_remove:
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sysfs_remove_group(&client->dev.kobj, &jnx_psu_group);
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exit_free:
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kfree(data);
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exit:
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return status;
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}
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static int jnx_psu_remove(struct i2c_client *client)
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{
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struct psu_data *data = i2c_get_clientdata(client);
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hwmon_device_unregister(data->hwmon_dev);
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sysfs_remove_group(&client->dev.kobj, &jnx_psu_group);
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kfree(data);
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return 0;
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}
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enum {
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JPSU,
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};
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static const struct i2c_device_id psu_id[] = {
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{ "jpsu", JPSU },
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{}
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};
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MODULE_DEVICE_TABLE(i2c, psu_id);
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static struct i2c_driver jnx_psu_monitor_driver = {
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.class = I2C_CLASS_HWMON,
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.driver = {
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.name = "jnx-psu-monitor",
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},
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.probe = jnx_psu_probe,
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.remove = jnx_psu_remove,
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.id_table = psu_id,
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.address_list = normal_i2c,
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};
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static int psu_read_word(struct i2c_client *client, u8 reg)
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{
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return i2c_smbus_read_word_data(client, reg);
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}
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struct reg_data_word {
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u8 reg;
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u16 *value;
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};
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static struct psu_data *psu_update_device(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct psu_data *data = i2c_get_clientdata(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, status;
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struct reg_data_word regs_word[] = {
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{0x00, &data->temp1_input},
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{0x01, &data->temp2_input},
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{0x02, &data->temp3_input},
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{0x03, &data->temp4_input},
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{0x28, &data->v_out},
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{0x32, &data->v_in},
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{0x33, &data->i_out},
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{0x3D, &data->i_in},
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{0x20, &data->fan1_input},
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{0x21, &data->fan2_input}
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};
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dev_dbg(dev, "Starting psu monitoring update\n");
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/* Read word data */
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for (i = 0; i < ARRAY_SIZE(regs_word); i++) {
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status = psu_read_word(client, regs_word[i].reg);
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if (status < 0)
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{
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dev_dbg(&client->dev, "reg %d, err %d\n",
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regs_word[i].reg, status);
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*(regs_word[i].value) = 0;
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}
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else {
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u16 value = (u16)status;
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(INVALID_READING != value) ? (*(regs_word[i].value) = status) :
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(*(regs_word[i].value) = 0);
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}
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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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mutex_unlock(&data->update_lock);
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return data;
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}
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module_i2c_driver(jnx_psu_monitor_driver);
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MODULE_AUTHOR("Ciju Rajan K <crajank@juniper.net>");
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MODULE_DESCRIPTION("Juniper PSU monitoring driver for QFX5200");
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MODULE_LICENSE("GPL");
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