240 lines
6.4 KiB
C
240 lines
6.4 KiB
C
/*
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* An hwmon driver for accton as7816_64x Power Module
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*
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* Copyright (C) 2014 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/delay.h>
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#include <linux/dmi.h>
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#define PSU_STATUS_I2C_ADDR 0x60
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#define PSU_STATUS_I2C_REG_OFFSET 0x03
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#define IS_POWER_GOOD(id, value) (!!(value & BIT(2+id)))
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#define IS_PRESENT(id, value) (!(value & BIT(id)))
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static ssize_t show_status(struct device *dev, struct device_attribute *da, char *buf);
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static struct as7816_64x_psu_data *as7816_64x_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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/* 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 as7816_64x_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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};
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enum as7816_64x_psu_sysfs_attributes {
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PSU_PRESENT,
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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_present, S_IRUGO, show_status, NULL, PSU_PRESENT);
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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 *as7816_64x_psu_attributes[] = {
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&sensor_dev_attr_psu_present.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_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 as7816_64x_psu_data *data = as7816_64x_psu_update_device(dev);
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u8 status = 0;
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if (!data->valid) {
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return -EIO;
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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 const struct attribute_group as7816_64x_psu_group = {
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.attrs = as7816_64x_psu_attributes,
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};
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static int as7816_64x_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 as7816_64x_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 as7816_64x_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, &as7816_64x_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, &as7816_64x_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 as7816_64x_psu_remove(struct i2c_client *client)
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{
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struct as7816_64x_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, &as7816_64x_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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as7816_64x_psu1,
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as7816_64x_psu2
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};
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static const struct i2c_device_id as7816_64x_psu_id[] = {
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{ "as7816_64x_psu1", as7816_64x_psu1 },
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{ "as7816_64x_psu2", as7816_64x_psu2 },
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{}
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};
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MODULE_DEVICE_TABLE(i2c, as7816_64x_psu_id);
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static struct i2c_driver as7816_64x_psu_driver = {
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.class = I2C_CLASS_HWMON,
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.driver = {
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.name = "as7816_64x_psu",
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},
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.probe = as7816_64x_psu_probe,
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.remove = as7816_64x_psu_remove,
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.id_table = as7816_64x_psu_id,
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.address_list = normal_i2c,
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};
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static struct as7816_64x_psu_data *as7816_64x_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 as7816_64x_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;
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data->valid = 0;
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dev_dbg(&client->dev, "Starting as7816_64x update\n");
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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 as7816_64x_psu_init(void)
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{
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return i2c_add_driver(&as7816_64x_psu_driver);
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}
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static void __exit as7816_64x_psu_exit(void)
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{
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i2c_del_driver(&as7816_64x_psu_driver);
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}
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module_init(as7816_64x_psu_init);
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module_exit(as7816_64x_psu_exit);
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MODULE_AUTHOR("Brandon Chuang <brandon_chuang@accton.com.tw>");
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MODULE_DESCRIPTION("as7816_64x_psu driver");
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MODULE_LICENSE("GPL");
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