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sonic-buildimage/platform/broadcom/sonic-platform-modules-juniper/qfx5200/modules/jnx-psu-monitor.c
ciju-juniper 695652c9d1
[platform]: Adding platform support for Juniper QFX5200 (#4376) 
This is a 1RU switch with 32 QSFP28 (40G/100G) ports on
Broadcom Tomahawk I chipset. CPU used in QFX5200-32C-S
is Intel Ivy Bridge. The machine has Redundant and
hot-swappable Power Supply (1+1) and also has Redundant
and hot swappable fans (5).

Signed-off-by: Ciju Rajan K <crajank@juniper.net>
Signed-off-by: Ashish Bhensdadia <bashish@juniper.net>
2020-04-16 03:09:32 -07:00

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/*
* A hwmon PSU monitoring driver for Juniper QFX5200 platform
*
* Copyright (C) 2020 Juniper Networks.
* Ciju Rajan K <crajank@juniper.net>
*
* Based on ym2651.c by Brandon Chuang <brandon_chuang@accton.com.tw>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/module.h>
#include <linux/jiffies.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/sysfs.h>
#include <linux/slab.h>
#define TEMP_INT_MASK (0xFFC0)
#define V_IN_INT_MASK (0xFFE0)
#define V_OUT_INT_MASK (0xFF00)
#define INVALID_READING (0xFFFF)
#define TEMP_FR_LEN 6
#define V_IN_FR_LEN 5
#define V_OUT_FR_LEN 8
static const unsigned short normal_i2c[] = { 0x58, 0x58, I2C_CLIENT_END };
struct psu_data {
struct device *hwmon_dev;
struct mutex update_lock;
char valid; /* !=0 if registers are valid */
unsigned long last_updated; /* In jiffies */
u16 v_out;
u16 i_out;
u16 v_in;
u16 i_in;
u16 temp1_input;
u16 temp2_input;
u16 temp3_input;
u16 temp4_input;
u16 fan1_input;
u16 fan2_input;
};
static ssize_t show_word(struct device *dev, struct device_attribute *da,
char *buf);
static struct psu_data *psu_update_device(struct device *dev);
enum psu_sysfs_attributes {
PSU_V_OUT,
PSU_I_OUT,
PSU_V_IN,
PSU_I_IN,
PSU_TEMP1_INPUT,
PSU_TEMP2_INPUT,
PSU_TEMP3_INPUT,
PSU_TEMP4_INPUT,
PSU_FAN1_RPM,
PSU_FAN2_RPM,
};
/*
* sysfs attributes for hwmon
*/
static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_word, NULL, PSU_V_OUT);
static SENSOR_DEVICE_ATTR(curr2_input, S_IRUGO, show_word, NULL, PSU_I_OUT);
static SENSOR_DEVICE_ATTR(psu_v_in, S_IRUGO, show_word, NULL, PSU_V_IN);
static SENSOR_DEVICE_ATTR(psu_i_in, S_IRUGO, show_word, NULL, PSU_I_IN);
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_word, NULL, PSU_TEMP1_INPUT);
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_word, NULL, PSU_TEMP2_INPUT);
static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_word, NULL, PSU_TEMP3_INPUT);
static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_word, NULL, PSU_TEMP4_INPUT);
static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_word, NULL, PSU_FAN1_RPM);
static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_word, NULL, PSU_FAN2_RPM);
static struct attribute *psu_attributes[] = {
&sensor_dev_attr_in3_input.dev_attr.attr,
&sensor_dev_attr_curr2_input.dev_attr.attr,
&sensor_dev_attr_psu_v_in.dev_attr.attr,
&sensor_dev_attr_psu_i_in.dev_attr.attr,
&sensor_dev_attr_temp1_input.dev_attr.attr,
&sensor_dev_attr_temp2_input.dev_attr.attr,
&sensor_dev_attr_temp3_input.dev_attr.attr,
&sensor_dev_attr_temp4_input.dev_attr.attr,
&sensor_dev_attr_fan1_input.dev_attr.attr,
&sensor_dev_attr_fan2_input.dev_attr.attr,
NULL
};
static short convert_to_decimal(u16 value,
u16 data_mask,
u8 fr_len)
{
return (((short)value >= 0) ? ((value & data_mask) >> fr_len) :
(-((((~(value & data_mask)) >> fr_len) + 1))));
}
static ssize_t show_word(struct device *dev, struct device_attribute *da,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
struct psu_data *data = psu_update_device(dev);
u32 value = 0x0000;
switch (attr->index) {
case PSU_V_OUT:
value = 1000 * convert_to_decimal(data->v_out,
V_OUT_INT_MASK,
V_OUT_FR_LEN);
break;
case PSU_V_IN:
value = convert_to_decimal(data->v_in,
V_IN_INT_MASK,
V_IN_FR_LEN);
break;
case PSU_I_IN:
value = data->i_in;
break;
case PSU_I_OUT:
value = 1000 * data->i_out / 64;
break;
case PSU_FAN1_RPM:
value = data->fan1_input;
break;
case PSU_FAN2_RPM:
value = data->fan2_input;
break;
case PSU_TEMP1_INPUT:
value = 1000 * convert_to_decimal(data->temp1_input,
TEMP_INT_MASK,
TEMP_FR_LEN);
break;
case PSU_TEMP2_INPUT:
value = 1000 * convert_to_decimal(data->temp2_input,
TEMP_INT_MASK,
TEMP_FR_LEN);
break;
case PSU_TEMP3_INPUT:
value = 1000 * convert_to_decimal(data->temp3_input,
TEMP_INT_MASK,
TEMP_FR_LEN);
break;
case PSU_TEMP4_INPUT:
value = 1000 * convert_to_decimal(data->temp4_input,
TEMP_INT_MASK,
TEMP_FR_LEN);
break;
}
return sprintf(buf, "%d\n", (int)value);
}
static const struct attribute_group jnx_psu_group = {
.attrs = psu_attributes,
};
static int jnx_psu_probe(struct i2c_client *client,
const struct i2c_device_id *dev_id)
{
struct psu_data *data;
int status;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_BYTE_DATA |
I2C_FUNC_SMBUS_WORD_DATA |
I2C_FUNC_SMBUS_I2C_BLOCK)) {
status = -EIO;
goto exit;
}
data = kzalloc(sizeof(struct psu_data), GFP_KERNEL);
if (!data) {
status = -ENOMEM;
goto exit;
}
i2c_set_clientdata(client, data);
mutex_init(&data->update_lock);
dev_dbg(&client->dev, "chip found\n");
/* Register sysfs hooks */
status = sysfs_create_group(&client->dev.kobj, &jnx_psu_group);
if (status) {
goto exit_free;
}
data->hwmon_dev = hwmon_device_register(&client->dev);
if (IS_ERR(data->hwmon_dev)) {
status = PTR_ERR(data->hwmon_dev);
goto exit_remove;
}
dev_info(&client->dev, "%s: psu '%s'\n",
dev_name(data->hwmon_dev), client->name);
return 0;
exit_remove:
sysfs_remove_group(&client->dev.kobj, &jnx_psu_group);
exit_free:
kfree(data);
exit:
return status;
}
static int jnx_psu_remove(struct i2c_client *client)
{
struct psu_data *data = i2c_get_clientdata(client);
hwmon_device_unregister(data->hwmon_dev);
sysfs_remove_group(&client->dev.kobj, &jnx_psu_group);
kfree(data);
return 0;
}
enum {
JPSU,
};
static const struct i2c_device_id psu_id[] = {
{ "jpsu", JPSU },
{}
};
MODULE_DEVICE_TABLE(i2c, psu_id);
static struct i2c_driver jnx_psu_monitor_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "jnx-psu-monitor",
},
.probe = jnx_psu_probe,
.remove = jnx_psu_remove,
.id_table = psu_id,
.address_list = normal_i2c,
};
static int psu_read_word(struct i2c_client *client, u8 reg)
{
return i2c_smbus_read_word_data(client, reg);
}
struct reg_data_word {
u8 reg;
u16 *value;
};
static struct psu_data *psu_update_device(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct psu_data *data = i2c_get_clientdata(client);
mutex_lock(&data->update_lock);
if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
|| !data->valid) {
int i, status;
struct reg_data_word regs_word[] = {
{0x00, &data->temp1_input},
{0x01, &data->temp2_input},
{0x02, &data->temp3_input},
{0x03, &data->temp4_input},
{0x28, &data->v_out},
{0x32, &data->v_in},
{0x33, &data->i_out},
{0x3D, &data->i_in},
{0x20, &data->fan1_input},
{0x21, &data->fan2_input}
};
dev_dbg(dev, "Starting psu monitoring update\n");
/* Read word data */
for (i = 0; i < ARRAY_SIZE(regs_word); i++) {
status = psu_read_word(client, regs_word[i].reg);
if (status < 0)
{
dev_dbg(&client->dev, "reg %d, err %d\n",
regs_word[i].reg, status);
*(regs_word[i].value) = 0;
}
else {
u16 value = (u16)status;
(INVALID_READING != value) ? (*(regs_word[i].value) = status) :
(*(regs_word[i].value) = 0);
}
}
data->last_updated = jiffies;
data->valid = 1;
}
mutex_unlock(&data->update_lock);
return data;
}
module_i2c_driver(jnx_psu_monitor_driver);
MODULE_AUTHOR("Ciju Rajan K <crajank@juniper.net>");
MODULE_DESCRIPTION("Juniper PSU monitoring driver for QFX5200");
MODULE_LICENSE("GPL");
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