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Common kernel modules. These will be built and installed automatically for each kernel.

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This commit is contained in:
Jeffrey Townsend
2017-01-01 18:04:42 +00:00
parent f6f9cdc99a
commit fb2009914b
1 changed files with 397 additions and 0 deletions
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packages/base/any/kernels/modules/cpr_4011_4mxx.c Normal file
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/*
* An hwmon driver for the CPR-4011-4Mxx Redundant Power Module
*
* Copyright (C) Brandon Chuang <brandon_chuang@accton.com.tw>
*
* Based on ad7414.c
* Copyright 2006 Stefan Roese <sr at denx.de>, DENX Software Engineering
*
* 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 MAX_FAN_DUTY_CYCLE 100
/* Addresses scanned
*/
static const unsigned short normal_i2c[] = { 0x3c, 0x3d, 0x3e, 0x3f, I2C_CLIENT_END };
/* Each client has this additional data
*/
struct cpr_4011_4mxx_data {
struct device *hwmon_dev;
struct mutex update_lock;
char valid; /* !=0 if registers are valid */
unsigned long last_updated; /* In jiffies */
u8 vout_mode; /* Register value */
u16 v_in; /* Register value */
u16 v_out; /* Register value */
u16 i_in; /* Register value */
u16 i_out; /* Register value */
u16 p_in; /* Register value */
u16 p_out; /* Register value */
u16 temp_input[2]; /* Register value */
u8 fan_fault; /* Register value */
u16 fan_duty_cycle[2]; /* Register value */
u16 fan_speed[2]; /* Register value */
};
static ssize_t show_linear(struct device *dev, struct device_attribute *da, char *buf);
static ssize_t show_fan_fault(struct device *dev, struct device_attribute *da, char *buf);
static ssize_t show_vout(struct device *dev, struct device_attribute *da, char *buf);
static ssize_t set_fan_duty_cycle(struct device *dev, struct device_attribute *da, const char *buf, size_t count);
static int cpr_4011_4mxx_write_word(struct i2c_client *client, u8 reg, u16 value);
static struct cpr_4011_4mxx_data *cpr_4011_4mxx_update_device(struct device *dev);
enum cpr_4011_4mxx_sysfs_attributes {
PSU_V_IN,
PSU_V_OUT,
PSU_I_IN,
PSU_I_OUT,
PSU_P_IN,
PSU_P_OUT,
PSU_TEMP1_INPUT,
PSU_FAN1_FAULT,
PSU_FAN1_DUTY_CYCLE,
PSU_FAN1_SPEED,
};
/* sysfs attributes for hwmon
*/
static SENSOR_DEVICE_ATTR(psu_v_in, S_IRUGO, show_linear, NULL, PSU_V_IN);
static SENSOR_DEVICE_ATTR(psu_v_out, S_IRUGO, show_vout, NULL, PSU_V_OUT);
static SENSOR_DEVICE_ATTR(psu_i_in, S_IRUGO, show_linear, NULL, PSU_I_IN);
static SENSOR_DEVICE_ATTR(psu_i_out, S_IRUGO, show_linear, NULL, PSU_I_OUT);
static SENSOR_DEVICE_ATTR(psu_p_in, S_IRUGO, show_linear, NULL, PSU_P_IN);
static SENSOR_DEVICE_ATTR(psu_p_out, S_IRUGO, show_linear, NULL, PSU_P_OUT);
static SENSOR_DEVICE_ATTR(psu_temp1_input, S_IRUGO, show_linear, NULL, PSU_TEMP1_INPUT);
static SENSOR_DEVICE_ATTR(psu_fan1_fault, S_IRUGO, show_fan_fault, NULL, PSU_FAN1_FAULT);
static SENSOR_DEVICE_ATTR(psu_fan1_duty_cycle_percentage, S_IWUSR | S_IRUGO, show_linear, set_fan_duty_cycle, PSU_FAN1_DUTY_CYCLE);
static SENSOR_DEVICE_ATTR(psu_fan1_speed_rpm, S_IRUGO, show_linear, NULL, PSU_FAN1_SPEED);
static struct attribute *cpr_4011_4mxx_attributes[] = {
&sensor_dev_attr_psu_v_in.dev_attr.attr,
&sensor_dev_attr_psu_v_out.dev_attr.attr,
&sensor_dev_attr_psu_i_in.dev_attr.attr,
&sensor_dev_attr_psu_i_out.dev_attr.attr,
&sensor_dev_attr_psu_p_in.dev_attr.attr,
&sensor_dev_attr_psu_p_out.dev_attr.attr,
&sensor_dev_attr_psu_temp1_input.dev_attr.attr,
&sensor_dev_attr_psu_fan1_fault.dev_attr.attr,
&sensor_dev_attr_psu_fan1_duty_cycle_percentage.dev_attr.attr,
&sensor_dev_attr_psu_fan1_speed_rpm.dev_attr.attr,
NULL
};
static int two_complement_to_int(u16 data, u8 valid_bit, int mask)
{
u16 valid_data = data & mask;
bool is_negative = valid_data >> (valid_bit - 1);
return is_negative ? (-(((~valid_data) & mask) + 1)) : valid_data;
}
static ssize_t set_fan_duty_cycle(struct device *dev, struct device_attribute *da,
const char *buf, size_t count)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
struct i2c_client *client = to_i2c_client(dev);
struct cpr_4011_4mxx_data *data = i2c_get_clientdata(client);
int nr = (attr->index == PSU_FAN1_DUTY_CYCLE) ? 0 : 1;
long speed;
int error;
error = kstrtol(buf, 10, &speed);
if (error)
return error;
if (speed < 0 || speed > MAX_FAN_DUTY_CYCLE)
return -EINVAL;
mutex_lock(&data->update_lock);
data->fan_duty_cycle[nr] = speed;
cpr_4011_4mxx_write_word(client, 0x3B + nr, data->fan_duty_cycle[nr]);
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t show_linear(struct device *dev, struct device_attribute *da,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
struct cpr_4011_4mxx_data *data = cpr_4011_4mxx_update_device(dev);
u16 value = 0;
int exponent, mantissa;
int multiplier = 1000;
switch (attr->index) {
case PSU_V_IN:
value = data->v_in;
break;
case PSU_I_IN:
value = data->i_in;
break;
case PSU_I_OUT:
value = data->i_out;
break;
case PSU_P_IN:
value = data->p_in;
break;
case PSU_P_OUT:
value = data->p_out;
break;
case PSU_TEMP1_INPUT:
value = data->temp_input[0];
break;
case PSU_FAN1_DUTY_CYCLE:
multiplier = 1;
value = data->fan_duty_cycle[0];
break;
case PSU_FAN1_SPEED:
multiplier = 1;
value = data->fan_speed[0];
break;
default:
break;
}
exponent = two_complement_to_int(value >> 11, 5, 0x1f);
mantissa = two_complement_to_int(value & 0x7ff, 11, 0x7ff);
return (exponent >= 0) ? sprintf(buf, "%d\n", (mantissa << exponent) * multiplier) :
sprintf(buf, "%d\n", (mantissa * multiplier) / (1 << -exponent));
}
static ssize_t show_fan_fault(struct device *dev, struct device_attribute *da,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
struct cpr_4011_4mxx_data *data = cpr_4011_4mxx_update_device(dev);
u8 shift = (attr->index == PSU_FAN1_FAULT) ? 7 : 6;
return sprintf(buf, "%d\n", data->fan_fault >> shift);
}
static ssize_t show_vout(struct device *dev, struct device_attribute *da,
char *buf)
{
struct cpr_4011_4mxx_data *data = cpr_4011_4mxx_update_device(dev);
int exponent, mantissa;
int multiplier = 1000;
exponent = two_complement_to_int(data->vout_mode, 5, 0x1f);
mantissa = data->v_out;
return (exponent > 0) ? sprintf(buf, "%d\n", (mantissa << exponent) * multiplier) :
sprintf(buf, "%d\n", (mantissa * multiplier) / (1 << -exponent));
}
static const struct attribute_group cpr_4011_4mxx_group = {
.attrs = cpr_4011_4mxx_attributes,
};
static int cpr_4011_4mxx_probe(struct i2c_client *client,
const struct i2c_device_id *dev_id)
{
struct cpr_4011_4mxx_data *data;
int status;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA)) {
status = -EIO;
goto exit;
}
data = kzalloc(sizeof(struct cpr_4011_4mxx_data), GFP_KERNEL);
if (!data) {
status = -ENOMEM;
goto exit;
}
i2c_set_clientdata(client, data);
data->valid = 0;
mutex_init(&data->update_lock);
dev_info(&client->dev, "chip found\n");
/* Register sysfs hooks */
status = sysfs_create_group(&client->dev.kobj, &cpr_4011_4mxx_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, &cpr_4011_4mxx_group);
exit_free:
kfree(data);
exit:
return status;
}
static int cpr_4011_4mxx_remove(struct i2c_client *client)
{
struct cpr_4011_4mxx_data *data = i2c_get_clientdata(client);
hwmon_device_unregister(data->hwmon_dev);
sysfs_remove_group(&client->dev.kobj, &cpr_4011_4mxx_group);
kfree(data);
return 0;
}
static const struct i2c_device_id cpr_4011_4mxx_id[] = {
{ "cpr_4011_4mxx", 0 },
{}
};
MODULE_DEVICE_TABLE(i2c, cpr_4011_4mxx_id);
static struct i2c_driver cpr_4011_4mxx_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "cpr_4011_4mxx",
},
.probe = cpr_4011_4mxx_probe,
.remove = cpr_4011_4mxx_remove,
.id_table = cpr_4011_4mxx_id,
.address_list = normal_i2c,
};
static int cpr_4011_4mxx_read_byte(struct i2c_client *client, u8 reg)
{
return i2c_smbus_read_byte_data(client, reg);
}
static int cpr_4011_4mxx_read_word(struct i2c_client *client, u8 reg)
{
return i2c_smbus_read_word_data(client, reg);
}
static int cpr_4011_4mxx_write_word(struct i2c_client *client, u8 reg, u16 value)
{
return i2c_smbus_write_word_data(client, reg, value);
}
struct reg_data_byte {
u8 reg;
u8 *value;
};
struct reg_data_word {
u8 reg;
u16 *value;
};
static struct cpr_4011_4mxx_data *cpr_4011_4mxx_update_device(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct cpr_4011_4mxx_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_byte regs_byte[] = { {0x20, &data->vout_mode},
{0x81, &data->fan_fault}};
struct reg_data_word regs_word[] = { {0x88, &data->v_in},
{0x8b, &data->v_out},
{0x89, &data->i_in},
{0x8c, &data->i_out},
{0x96, &data->p_out},
{0x97, &data->p_in},
{0x8d, &(data->temp_input[0])},
{0x8e, &(data->temp_input[1])},
{0x3b, &(data->fan_duty_cycle[0])},
{0x3c, &(data->fan_duty_cycle[1])},
{0x90, &(data->fan_speed[0])},
{0x91, &(data->fan_speed[1])}};
dev_dbg(&client->dev, "Starting cpr_4011_4mxx update\n");
/* Read byte data */
for (i = 0; i < ARRAY_SIZE(regs_byte); i++) {
status = cpr_4011_4mxx_read_byte(client, regs_byte[i].reg);
if (status < 0) {
dev_dbg(&client->dev, "reg %d, err %d\n",
regs_byte[i].reg, status);
}
else {
*(regs_byte[i].value) = status;
}
}
/* Read word data */
for (i = 0; i < ARRAY_SIZE(regs_word); i++) {
status = cpr_4011_4mxx_read_word(client, regs_word[i].reg);
if (status < 0) {
dev_dbg(&client->dev, "reg %d, err %d\n",
regs_word[i].reg, status);
}
else {
*(regs_word[i].value) = status;
}
}
data->last_updated = jiffies;
data->valid = 1;
}
mutex_unlock(&data->update_lock);
return data;
}
static int __init cpr_4011_4mxx_init(void)
{
return i2c_add_driver(&cpr_4011_4mxx_driver);
}
static void __exit cpr_4011_4mxx_exit(void)
{
i2c_del_driver(&cpr_4011_4mxx_driver);
}
MODULE_AUTHOR("Brandon Chuang <brandon_chuang@accton.com.tw>");
MODULE_DESCRIPTION("CPR_4011_4MXX driver");
MODULE_LICENSE("GPL");
module_init(cpr_4011_4mxx_init);
module_exit(cpr_4011_4mxx_exit);