319 lines
9.4 KiB
C
319 lines
9.4 KiB
C
/*
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* An hwmon driver for accton as5812_54t sfp
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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 QSFP_PORT_START_INDEX 49
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#define BIT_INDEX(i) (1ULL << (i))
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/* Addresses scanned
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*/
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static const unsigned short normal_i2c[] = { 0x50, I2C_CLIENT_END };
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/* Each client has this additional data
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*/
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struct as5812_54t_sfp_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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int port; /* Front port index */
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char eeprom[256]; /* eeprom data */
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u8 status; /* bit0:port49, bit1:port50 and so on */
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};
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static struct as5812_54t_sfp_data *as5812_54t_sfp_update_device(struct device *dev, int update_eeprom);
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static ssize_t show_port_number(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_eeprom(struct device *dev, struct device_attribute *da, char *buf);
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extern int accton_i2c_cpld_read(unsigned short cpld_addr, u8 reg);
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extern int accton_i2c_cpld_write(unsigned short cpld_addr, u8 reg, u8 value);
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enum as5812_54t_sfp_sysfs_attributes {
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SFP_IS_PRESENT,
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SFP_PORT_NUMBER,
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SFP_EEPROM,
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SFP_IS_PRESENT_ALL,
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};
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/* sysfs attributes for hwmon
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*/
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static SENSOR_DEVICE_ATTR(sfp_is_present, S_IRUGO, show_status, NULL, SFP_IS_PRESENT);
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static SENSOR_DEVICE_ATTR(sfp_port_number, S_IRUGO, show_port_number, NULL, SFP_PORT_NUMBER);
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static SENSOR_DEVICE_ATTR(sfp_eeprom, S_IRUGO, show_eeprom, NULL, SFP_EEPROM);
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static SENSOR_DEVICE_ATTR(sfp_is_present_all, S_IRUGO, show_status,NULL, SFP_IS_PRESENT_ALL);
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static struct attribute *as5812_54t_sfp_attributes[] = {
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&sensor_dev_attr_sfp_is_present.dev_attr.attr,
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&sensor_dev_attr_sfp_eeprom.dev_attr.attr,
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&sensor_dev_attr_sfp_port_number.dev_attr.attr,
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&sensor_dev_attr_sfp_is_present_all.dev_attr.attr,
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NULL
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};
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static ssize_t show_port_number(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_sfp_data *data = i2c_get_clientdata(client);
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return sprintf(buf, "%d\n",data->port);
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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_sfp_data *data = as5812_54t_sfp_update_device(dev, 0);
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if (attr->index == SFP_IS_PRESENT) {
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u8 val;
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val = (data->status & BIT_INDEX(data->port - QSFP_PORT_START_INDEX)) ? 0 : 1;
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return sprintf(buf, "%d", val);
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}
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else { /* SFP_IS_PRESENT_ALL */
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return sprintf(buf, "%.2x\n", ~data->status);
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}
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}
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static ssize_t show_eeprom(struct device *dev, struct device_attribute *da,
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char *buf)
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{
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struct as5812_54t_sfp_data *data = as5812_54t_sfp_update_device(dev, 1);
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if (!data->valid) {
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return 0;
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}
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if ((data->status & BIT_INDEX(data->port - QSFP_PORT_START_INDEX)) != 0) {
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return 0;
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}
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memcpy(buf, data->eeprom, sizeof(data->eeprom));
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return sizeof(data->eeprom);
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}
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static const struct attribute_group as5812_54t_sfp_group = {
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.attrs = as5812_54t_sfp_attributes,
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};
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static int as5812_54t_sfp_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_sfp_data *data;
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int status;
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
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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_sfp_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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mutex_init(&data->update_lock);
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data->port = dev_id->driver_data;
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i2c_set_clientdata(client, data);
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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_sfp_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: sfp '%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_sfp_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_sfp_remove(struct i2c_client *client)
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{
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struct as5812_54t_sfp_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_sfp_group);
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kfree(data);
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return 0;
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}
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enum port_numbers {
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as5812_54t_qsfp49 = 49,
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as5812_54t_qsfp50,
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as5812_54t_qsfp51,
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as5812_54t_qsfp52,
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as5812_54t_qsfp53,
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as5812_54t_qsfp54
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};
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static const struct i2c_device_id as5812_54t_sfp_id[] = {
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{ "as5812_54t_qsfp49", as5812_54t_qsfp49 }, { "as5812_54t_qsfp50", as5812_54t_qsfp50 },
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{ "as5812_54t_qsfp51", as5812_54t_qsfp51 }, { "as5812_54t_qsfp52", as5812_54t_qsfp52 },
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{ "as5812_54t_qsfp53", as5812_54t_qsfp53 }, { "as5812_54t_qsfp54", as5812_54t_qsfp54 },
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{}
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};
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MODULE_DEVICE_TABLE(i2c, as5812_54t_sfp_id);
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static struct i2c_driver as5812_54t_sfp_driver = {
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.class = I2C_CLASS_HWMON,
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.driver = {
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.name = "as5812_54t_sfp",
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},
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.probe = as5812_54t_sfp_probe,
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.remove = as5812_54t_sfp_remove,
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.id_table = as5812_54t_sfp_id,
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.address_list = normal_i2c,
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};
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static int as5812_54t_sfp_read_byte(struct i2c_client *client, u8 command, u8 *data)
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{
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int result = i2c_smbus_read_byte_data(client, command);
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if (unlikely(result < 0)) {
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dev_dbg(&client->dev, "sfp read byte data failed, command(0x%2x), data(0x%2x)\r\n", command, result);
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goto abort;
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}
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*data = (u8)result;
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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 struct as5812_54t_sfp_data *as5812_54t_sfp_update_device(struct device *dev, int update_eeprom)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct as5812_54t_sfp_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 || update_eeprom) {
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int status = -1;
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int i = 0;
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data->valid = 0;
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//dev_dbg(&client->dev, "Starting as5812_54t sfp status update\n");
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data->status = 0xFF;
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/*
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* Bring QSFPs out of reset,
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* This is a temporary fix until the QSFP+_MOD_RST register
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* can be exposed through the driver.
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*/
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accton_i2c_cpld_write(0x60, 0x23, 0x3F);
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/* Read present status of port 49-54(QSFP port) */
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status = accton_i2c_cpld_read(0x60, 0x22);
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if (status < 0) {
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dev_dbg(&client->dev, "cpld(0x60) reg(0x22) err %d\n", status);
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}
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else {
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data->status = status & 0x3F; /* (u32)status */
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}
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if (update_eeprom) {
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/* Read eeprom data based on port number */
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memset(data->eeprom, 0, sizeof(data->eeprom));
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/* Check if the port is present */
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if ((data->status & BIT_INDEX(data->port - QSFP_PORT_START_INDEX)) == 0) {
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/* read eeprom */
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for (i = 0; i < sizeof(data->eeprom); i++) {
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status = as5812_54t_sfp_read_byte(client, i, data->eeprom + i);
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if (status < 0) {
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dev_dbg(&client->dev, "unable to read eeprom from port(%d)\n",
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data->port);
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goto exit;
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}
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}
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}
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}
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data->valid = 1;
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data->last_updated = jiffies;
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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_sfp_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_sfp_driver);
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}
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static void __exit as5812_54t_sfp_exit(void)
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{
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i2c_del_driver(&as5812_54t_sfp_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_sfp driver");
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MODULE_LICENSE("GPL");
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module_init(as5812_54t_sfp_init);
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module_exit(as5812_54t_sfp_exit);
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