373 lines
11 KiB
C
373 lines
11 KiB
C
/*
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* An hwmon driver for accton as5812_54t Power Module
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*
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* Copyright (C) 2015 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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#define PSU_STATUS_I2C_ADDR 0x60
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#define PSU_STATUS_I2C_REG_OFFSET 0x2
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#define IS_POWER_GOOD(id, value) (!!(value & BIT(id*4 + 1)))
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#define IS_PRESENT(id, value) (!(value & BIT(id*4)))
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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 int as5812_54t_psu_read_block(struct i2c_client *client, u8 command, u8 *data,int data_len);
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extern int accton_i2c_cpld_read(unsigned short cpld_addr, u8 reg);
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static int as5812_54t_psu_model_name_get(struct device *dev);
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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 as5812_54t_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 model_name[14]; /* Model name, read from eeprom */
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};
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static struct as5812_54t_psu_data *as5812_54t_psu_update_device(struct device *dev);
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enum as5812_54t_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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};
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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_power_good, S_IRUGO, show_status, NULL, PSU_POWER_GOOD);
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static struct attribute *as5812_54t_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_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 as5812_54t_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 as5812_54t_psu_data *data = as5812_54t_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_model_name(struct device *dev, struct device_attribute *da,
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char *buf)
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{
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struct as5812_54t_psu_data *data = as5812_54t_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 (as5812_54t_psu_model_name_get(dev) < 0) {
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return -ENXIO;
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}
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return sprintf(buf, "%s\n", data->model_name);
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}
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static const struct attribute_group as5812_54t_psu_group = {
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.attrs = as5812_54t_psu_attributes,
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};
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static int as5812_54t_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 as5812_54t_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 as5812_54t_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, &as5812_54t_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, &as5812_54t_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 as5812_54t_psu_remove(struct i2c_client *client)
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{
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struct as5812_54t_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, &as5812_54t_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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as5812_54t_psu1,
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as5812_54t_psu2
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};
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static const struct i2c_device_id as5812_54t_psu_id[] = {
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{ "as5812_54t_psu1", as5812_54t_psu1 },
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{ "as5812_54t_psu2", as5812_54t_psu2 },
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{}
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};
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MODULE_DEVICE_TABLE(i2c, as5812_54t_psu_id);
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static struct i2c_driver as5812_54t_psu_driver = {
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.class = I2C_CLASS_HWMON,
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.driver = {
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.name = "as5812_54t_psu",
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},
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.probe = as5812_54t_psu_probe,
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.remove = as5812_54t_psu_remove,
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.id_table = as5812_54t_psu_id,
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.address_list = normal_i2c,
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};
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static int as5812_54t_psu_read_block(struct i2c_client *client, u8 command, u8 *data,
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int data_len)
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{
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int result = i2c_smbus_read_i2c_block_data(client, command, data_len, data);
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if (unlikely(result < 0))
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goto abort;
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if (unlikely(result != data_len)) {
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result = -EIO;
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goto abort;
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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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enum psu_type {
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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_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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};
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struct model_name_info {
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enum psu_type type;
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u8 offset;
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u8 length;
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char* model_name;
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};
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struct model_name_info models[] = {
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{PSU_YM_2401_JCR, 0x20, 11, "YM-2401JCR"},
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{PSU_YM_2401_JDR, 0x20, 11, "YM-2401JDR"},
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{PSU_CPR_4011_4M11, 0x26, 13, "CPR-4011-4M11"},
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{PSU_CPR_4011_4M21, 0x26, 13, "CPR-4011-4M21"},
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{PSU_CPR_6011_2M11, 0x26, 13, "CPR-6011-2M11"},
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{PSU_CPR_6011_2M21, 0x26, 13, "CPR-6011-2M21"},
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{PSU_UM400D_01G, 0x50, 9, "um400d01G"},
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{PSU_UM400D01_01G, 0x50, 12, "um400d01-01G"},
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};
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static int as5812_54t_psu_model_name_get(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct as5812_54t_psu_data *data = i2c_get_clientdata(client);
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int i, status;
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for (i = 0; i < ARRAY_SIZE(models); i++) {
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memset(data->model_name, 0, sizeof(data->model_name));
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status = as5812_54t_psu_read_block(client, models[i].offset,
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data->model_name, models[i].length);
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if (status < 0) {
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data->model_name[0] = '\0';
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dev_dbg(&client->dev, "unable to read model name from (0x%x) offset(0x%x)\n",
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client->addr, models[i].offset);
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return status;
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}
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else {
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data->model_name[models[i].length] = '\0';
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}
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if (i == PSU_YM_2401_JCR || i == PSU_YM_2401_JDR) {
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/* Skip the meaningless data byte 8*/
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data->model_name[8] = data->model_name[9];
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data->model_name[9] = data->model_name[10];
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data->model_name[10] = '\0';
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}
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/* Determine if the model name is known, if not, read next index
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*/
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if (strncmp(data->model_name, models[i].model_name, models[i].length) == 0) {
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return 0;
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}
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else {
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data->model_name[0] = '\0';
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}
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}
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return -ENODATA;
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}
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static struct as5812_54t_psu_data *as5812_54t_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 as5812_54t_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 status = -1;
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dev_dbg(&client->dev, "Starting as5812_54t update\n");
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data->valid = 0;
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/* Read psu status */
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status = accton_i2c_cpld_read(PSU_STATUS_I2C_ADDR, PSU_STATUS_I2C_REG_OFFSET);
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if (status < 0) {
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dev_dbg(&client->dev, "cpld reg (0x%x) err %d\n", PSU_STATUS_I2C_ADDR, status);
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goto exit;
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}
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else {
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data->status = status;
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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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exit:
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mutex_unlock(&data->update_lock);
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return data;
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}
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static int __init as5812_54t_psu_init(void)
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{
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extern int platform_accton_as5812_54t(void);
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if (!platform_accton_as5812_54t()) {
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return -ENODEV;
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}
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return i2c_add_driver(&as5812_54t_psu_driver);
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}
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static void __exit as5812_54t_psu_exit(void)
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{
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i2c_del_driver(&as5812_54t_psu_driver);
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}
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MODULE_AUTHOR("Brandon Chuang <brandon_chuang@accton.com.tw>");
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MODULE_DESCRIPTION("accton as5812_54t_psu driver");
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MODULE_LICENSE("GPL");
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module_init(as5812_54t_psu_init);
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module_exit(as5812_54t_psu_exit);
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