455 lines
13 KiB
C
455 lines
13 KiB
C
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/*
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* An hwmon driver for accton as7315_27xb Power Module
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*
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* Copyright (C) 2019 Accton Technology Corporation.
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* Brandon Chuang <brandon_chuang@accton.com.tw>
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*
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* Based on ad7414.c
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* Copyright 2006 Stefan Roese <sr at denx.de>, DENX Software Engineering
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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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#include <linux/printk.h>
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#define DRV_NAME "as7315_27xb_psu"
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#define PSU_STATUS_I2C_ADDR 0x64
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#define PSU_STATUS_I2C_REG_OFFSET 0x2
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#define USE_BYTE_ACCESS 0 /*Somehow i2c block access is failed on this platform.*/
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#define UPDATE_PERIOD (HZ*2)
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#define MAX_OUTPUT_LENGTH 32
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#define BASIC_EEPROM_SIZE 32
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#define IS_POWER_GOOD(id, value) (!!(value & BIT(id + 2)))
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#define IS_PRESENT(id, value) (!(value & BIT(id)))
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/* Addresses scanned
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*/
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static const unsigned short normal_i2c[] = { I2C_CLIENT_END };
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/* Each client has this additional data
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*/
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struct as7315_27xb_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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u8 index; /* PSU index */
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u8 status; /* Status(present/power_good) register read from CPLD */
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char eeprom[BASIC_EEPROM_SIZE*2]; /* EEPROM*/
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};
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enum as7315_27xb_psu_sysfs_attributes {
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PSU_INDEX,
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PSU_PRESENT,
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PSU_MODEL_NAME,
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PSU_POWER_GOOD,
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PSU_SERIAL_NUMBER
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};
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enum psu_type {
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PSU_YM_1401_A, /* AC110V - B2F */
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PSU_YM_2401_JCR, /* AC110V - F2B */
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PSU_YM_2401_JDR, /* AC110V - B2F */
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PSU_YM_2401_TCR, /* AC110V - B2F */
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PSU_CPR_4011_4M11, /* AC110V - F2B */
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PSU_CPR_4011_4M21, /* AC110V - B2F */
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PSU_CPR_6011_2M11, /* AC110V - F2B */
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PSU_CPR_6011_2M21, /* AC110V - B2F */
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PSU_UM400D_01G, /* DC48V - F2B */
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PSU_UM400D01_01G, /* DC48V - B2F */
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PSU_BEL_TOT120, /* DC48V - N/A */
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PSU_TYPE_MAX
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};
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struct model_info {
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enum psu_type type;
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u8 offset;
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char* model_name;
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u8 serial_offset;
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};
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struct model_info models[] = {
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{PSU_YM_1401_A, 0x20, "YM-1401ACR",0x35},
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{PSU_YM_2401_JCR, 0x20, "YM-2401JCR",0x35},
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{PSU_YM_2401_JDR, 0x20, "YM-2401JDR",0x35},
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{PSU_YM_2401_TCR, 0x20, "YM-2401TCR",0x35},
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{PSU_CPR_4011_4M11, 0x26, "CPR-4011-4M11",0x47},
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{PSU_CPR_4011_4M21, 0x26, "CPR-4011-4M21",0x47},
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{PSU_CPR_6011_2M11, 0x26, "CPR-6011-2M11",0x46},
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{PSU_CPR_6011_2M21, 0x26, "CPR-6011-2M21",0x46},
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{PSU_UM400D_01G, 0x50, "um400d01G",0x50},
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{PSU_UM400D01_01G, 0x50, "um400d01-01G",0x50},
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{PSU_BEL_TOT120, 0x0A, "CRXT-T0T120",0x18},
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};
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static ssize_t show_index(struct device *dev, struct device_attribute *da, char *buf);
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static ssize_t show_status(struct device *dev, struct device_attribute *da, char *buf);
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static ssize_t show_model_name(struct device *dev, struct device_attribute *da, char *buf);
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static ssize_t show_serial_number(struct device *dev, struct device_attribute *da,char *buf);
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static int as7315_27xb_psu_block_read(struct i2c_client *client, u8 command, u8 *data,int data_len);
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static int as7315_27xb_psu_model_name_get(
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struct device *dev, char *buf);
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static int as7315_27xb_psu_serial_number_get(
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struct device *dev, enum psu_type type, char *out);
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static struct as7315_27xb_psu_data *as7315_27xb_psu_update_device(struct device *dev);
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extern int accton_i2c_cpld_read(u8 cpld_addr, u8 reg);
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/* sysfs attributes for hwmon
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*/
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static SENSOR_DEVICE_ATTR(psu_index, S_IRUGO, show_index, NULL, PSU_INDEX);
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static SENSOR_DEVICE_ATTR(psu_present, S_IRUGO, show_status, NULL, PSU_PRESENT);
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static SENSOR_DEVICE_ATTR(psu_model_name, S_IRUGO, show_model_name,NULL, PSU_MODEL_NAME);
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static SENSOR_DEVICE_ATTR(psu_serial, S_IRUGO, show_serial_number, NULL, PSU_SERIAL_NUMBER);
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static SENSOR_DEVICE_ATTR(psu_power_good, S_IRUGO, show_status, NULL, PSU_POWER_GOOD);
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static struct attribute *as7315_27xb_psu_attributes[] = {
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&sensor_dev_attr_psu_index.dev_attr.attr,
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&sensor_dev_attr_psu_present.dev_attr.attr,
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&sensor_dev_attr_psu_model_name.dev_attr.attr,
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&sensor_dev_attr_psu_serial.dev_attr.attr,
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&sensor_dev_attr_psu_power_good.dev_attr.attr,
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NULL
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};
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static ssize_t show_index(struct device *dev, struct device_attribute *da,
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char *buf)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct as7315_27xb_psu_data *data = i2c_get_clientdata(client);
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return sprintf(buf, "%d\n", data->index);
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}
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static ssize_t show_status(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 as7315_27xb_psu_data *data = as7315_27xb_psu_update_device(dev);
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u8 status = 0;
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if (!data->valid) {
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return sprintf(buf, "0\n");
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}
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if (attr->index == PSU_PRESENT) {
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status = IS_PRESENT(data->index, data->status);
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}
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else { /* PSU_POWER_GOOD */
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status = IS_POWER_GOOD(data->index, data->status);
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}
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return sprintf(buf, "%d\n", status);
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}
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static ssize_t show_serial_number(struct device *dev, struct device_attribute *da,
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char *buf)
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{
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int i;
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struct as7315_27xb_psu_data *data = as7315_27xb_psu_update_device(dev);
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if (!data->valid) {
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return 0;
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}
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if (!IS_PRESENT(data->index, data->status)) {
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return 0;
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}
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i = as7315_27xb_psu_model_name_get(dev, buf);
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if ( i < 0) {
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return -ENXIO;
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}
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if (as7315_27xb_psu_serial_number_get(dev, i, buf) < 0) {
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return -ENXIO;
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}
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return sprintf(buf, "%s\n", buf);
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}
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static ssize_t show_model_name(struct device *dev, struct device_attribute *da,
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char *buf)
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{
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struct as7315_27xb_psu_data *data = as7315_27xb_psu_update_device(dev);
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if (!data->valid) {
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return 0;
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}
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if (!IS_PRESENT(data->index, data->status)) {
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return 0;
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}
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if (as7315_27xb_psu_model_name_get(dev, buf) < 0) {
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return -ENXIO;
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}
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return sprintf(buf, "%s\n", buf);
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}
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static const struct attribute_group as7315_27xb_psu_group = {
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.attrs = as7315_27xb_psu_attributes,
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};
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static int as7315_27xb_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 as7315_27xb_psu_data *data;
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int status;
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if (!i2c_check_functionality(client->adapter, 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 as7315_27xb_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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data->valid = 0;
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data->index = dev_id->driver_data;
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mutex_init(&data->update_lock);
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dev_info(&client->dev, "chip found\n");
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/* Register sysfs hooks */
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status = sysfs_create_group(&client->dev.kobj, &as7315_27xb_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_with_info(&client->dev,
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client->name, NULL, NULL, NULL);
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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, &as7315_27xb_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 as7315_27xb_psu_remove(struct i2c_client *client)
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{
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struct as7315_27xb_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, &as7315_27xb_psu_group);
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kfree(data);
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return 0;
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}
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enum psu_index
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{
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as7315_27xb_psu1,
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as7315_27xb_psu2
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};
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static const struct i2c_device_id as7315_27xb_psu_id[] = {
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{ "as7315_27xb_psu1", as7315_27xb_psu1 },
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{ "as7315_27xb_psu2", as7315_27xb_psu2 },
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{}
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};
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MODULE_DEVICE_TABLE(i2c, as7315_27xb_psu_id);
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static struct i2c_driver as7315_27xb_psu_driver = {
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.class = I2C_CLASS_HWMON,
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.driver = {
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.name = DRV_NAME,
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},
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.probe = as7315_27xb_psu_probe,
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.remove = as7315_27xb_psu_remove,
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.id_table = as7315_27xb_psu_id,
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.address_list = normal_i2c,
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};
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static int as7315_27xb_psu_block_read(struct i2c_client *client,
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u8 command, u8 *data, int max_len)
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{
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int result;
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u8 i, offset;
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if (i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_READ_I2C_BLOCK)) {
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for (i = 0; i < max_len; i += 32) {
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offset = i + command ;
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result = i2c_smbus_read_i2c_block_data(client, offset,
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32, data + i);
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if (result != 32) {
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result = -EIO;
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goto abort;
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}
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}
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} else {
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for (i = 0; i < max_len; i += 2) {
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int word;
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offset = i + command ;
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word = i2c_smbus_read_word_data(client, offset);
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if (word < 0) {
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result = -EIO;
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goto abort;
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}
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data[i] = word & 0xff;
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data[i + 1] = word >> 8;
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}
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}
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result = 0;
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abort:
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return result;
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}
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static int as7315_27xb_psu_serial_number_get(
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struct device *dev, enum psu_type type, char *out)
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{
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char *serial;
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struct as7315_27xb_psu_data *data = as7315_27xb_psu_update_device(dev);
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||
|
|
if (type >= PSU_TYPE_MAX) {
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!data->valid) {
|
||
|
|
out[0] = '\0';
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
serial = data->eeprom + models[type].serial_offset;
|
||
|
|
strncpy(out, serial, MAX_OUTPUT_LENGTH);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int find_model_name_from_eeprom( char *eeprom)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
char *name;
|
||
|
|
|
||
|
|
for (i = 0; i < ARRAY_SIZE(models); i++) {
|
||
|
|
name = eeprom + models[i].offset;
|
||
|
|
if (strncmp(name, models[i].model_name,
|
||
|
|
strlen(models[i].model_name)) == 0) {
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return (i == ARRAY_SIZE(models))? -EINVAL: i;
|
||
|
|
}
|
||
|
|
static int as7315_27xb_psu_model_name_get(
|
||
|
|
struct device *dev, char *buf)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
struct as7315_27xb_psu_data *data = as7315_27xb_psu_update_device(dev);
|
||
|
|
|
||
|
|
if (!data->valid) {
|
||
|
|
return sprintf(buf, "0\n");
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Determine if the model name is known, if not, read next index
|
||
|
|
*/
|
||
|
|
i = find_model_name_from_eeprom(data->eeprom);
|
||
|
|
if (i < 0) {
|
||
|
|
return -ENODATA;
|
||
|
|
}
|
||
|
|
|
||
|
|
mutex_lock(&data->update_lock);
|
||
|
|
strncpy(buf, models[i].model_name, MAX_OUTPUT_LENGTH);
|
||
|
|
/*Work-around for some special models*/
|
||
|
|
if (i == PSU_YM_2401_JCR || i == PSU_YM_2401_JDR ||
|
||
|
|
i == PSU_YM_1401_A || i == PSU_YM_2401_TCR) {
|
||
|
|
/* Skip the meaningless data byte 8*/
|
||
|
|
buf[8] = buf[9];
|
||
|
|
buf[9] = buf[10];
|
||
|
|
buf = '\0';
|
||
|
|
}
|
||
|
|
|
||
|
|
mutex_unlock(&data->update_lock);
|
||
|
|
return i;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct as7315_27xb_psu_data *as7315_27xb_psu_update_device(struct device *dev)
|
||
|
|
{
|
||
|
|
struct i2c_client *client = to_i2c_client(dev);
|
||
|
|
struct as7315_27xb_psu_data *data = i2c_get_clientdata(client);
|
||
|
|
|
||
|
|
mutex_lock(&data->update_lock);
|
||
|
|
if (time_after(jiffies, data->last_updated + UPDATE_PERIOD)
|
||
|
|
|| !data->valid) {
|
||
|
|
int status = -1;
|
||
|
|
|
||
|
|
dev_dbg(&client->dev, "Starting as7315_27xb update\n");
|
||
|
|
data->valid = 0;
|
||
|
|
|
||
|
|
/* Read psu status */
|
||
|
|
status = accton_i2c_cpld_read(PSU_STATUS_I2C_ADDR, PSU_STATUS_I2C_REG_OFFSET);
|
||
|
|
if (status < 0) {
|
||
|
|
dev_dbg(&client->dev,
|
||
|
|
"cpld reg (0x%x) err %d\n", PSU_STATUS_I2C_ADDR, status);
|
||
|
|
goto exit;
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
data->status = status;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/*Read the eeprom of psu*/
|
||
|
|
memset(data->eeprom, 0, sizeof(data->eeprom));
|
||
|
|
status = as7315_27xb_psu_block_read(client, 0,
|
||
|
|
data->eeprom, sizeof(data->eeprom));
|
||
|
|
|
||
|
|
if (status < 0) {
|
||
|
|
dev_dbg(&client->dev, "unable to read eeprom from (0x%x)\n",
|
||
|
|
client->addr);
|
||
|
|
goto exit;
|
||
|
|
}
|
||
|
|
data->last_updated = jiffies;
|
||
|
|
data->valid = 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
exit:
|
||
|
|
mutex_unlock(&data->update_lock);
|
||
|
|
return data;
|
||
|
|
}
|
||
|
|
|
||
|
|
module_i2c_driver(as7315_27xb_psu_driver);
|
||
|
|
|
||
|
|
MODULE_AUTHOR("Brandon Chuang <brandon_chuang@accton.com.tw>");
|
||
|
|
MODULE_DESCRIPTION("accton as7315_27xb_psu driver");
|
||
|
|
MODULE_LICENSE("GPL");
|
||
|
|
|