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linux_dsm_epyc7002/drivers/hwmon/lineage-pem.c
Stephen Kitt 6748703856 hwmon: use simple i2c probe function 
Many hwmon drivers don't use the id information provided by the old
i2c probe function, and the remainder can easily be adapted to the new
form ("probe_new") by calling i2c_match_id explicitly.

This avoids scanning the identifier tables during probes.

Drivers which didn't use the id are converted as-is; drivers which did
are modified as follows:

* if the information in i2c_client is sufficient, that's used instead
  (client->name);
* anything else is handled by calling i2c_match_id() with the same
  level of error-handling (if any) as before.

A few drivers aren't included in this patch because they have a
different set of maintainers. They will be covered by other patches.

Signed-off-by: Stephen Kitt <steve@sk2.org>
Link: https://lore.kernel.org/r/20200813160222.1503401-1-steve@sk2.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2020-09-23 09:42:39 -07:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Driver for Lineage Compact Power Line series of power entry modules.
*
* Copyright (C) 2010, 2011 Ericsson AB.
*
* Documentation:
* http://www.lineagepower.com/oem/pdf/CPLI2C.pdf
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/jiffies.h>
/*
* This driver supports various Lineage Compact Power Line DC/DC and AC/DC
* converters such as CP1800, CP2000AC, CP2000DC, CP2100DC, and others.
*
* The devices are nominally PMBus compliant. However, most standard PMBus
* commands are not supported. Specifically, all hardware monitoring and
* status reporting commands are non-standard. For this reason, a standard
* PMBus driver can not be used.
*
* All Lineage CPL devices have a built-in I2C bus master selector (PCA9541).
* To ensure device access, this driver should only be used as client driver
* to the pca9541 I2C master selector driver.
*/
/* Command codes */
#define PEM_OPERATION 0x01
#define PEM_CLEAR_INFO_FLAGS 0x03
#define PEM_VOUT_COMMAND 0x21
#define PEM_VOUT_OV_FAULT_LIMIT 0x40
#define PEM_READ_DATA_STRING 0xd0
#define PEM_READ_INPUT_STRING 0xdc
#define PEM_READ_FIRMWARE_REV 0xdd
#define PEM_READ_RUN_TIMER 0xde
#define PEM_FAN_HI_SPEED 0xdf
#define PEM_FAN_NORMAL_SPEED 0xe0
#define PEM_READ_FAN_SPEED 0xe1
/* offsets in data string */
#define PEM_DATA_STATUS_2 0
#define PEM_DATA_STATUS_1 1
#define PEM_DATA_ALARM_2 2
#define PEM_DATA_ALARM_1 3
#define PEM_DATA_VOUT_LSB 4
#define PEM_DATA_VOUT_MSB 5
#define PEM_DATA_CURRENT 6
#define PEM_DATA_TEMP 7
/* Virtual entries, to report constants */
#define PEM_DATA_TEMP_MAX 10
#define PEM_DATA_TEMP_CRIT 11
/* offsets in input string */
#define PEM_INPUT_VOLTAGE 0
#define PEM_INPUT_POWER_LSB 1
#define PEM_INPUT_POWER_MSB 2
/* offsets in fan data */
#define PEM_FAN_ADJUSTMENT 0
#define PEM_FAN_FAN1 1
#define PEM_FAN_FAN2 2
#define PEM_FAN_FAN3 3
/* Status register bits */
#define STS1_OUTPUT_ON (1 << 0)
#define STS1_LEDS_FLASHING (1 << 1)
#define STS1_EXT_FAULT (1 << 2)
#define STS1_SERVICE_LED_ON (1 << 3)
#define STS1_SHUTDOWN_OCCURRED (1 << 4)
#define STS1_INT_FAULT (1 << 5)
#define STS1_ISOLATION_TEST_OK (1 << 6)
#define STS2_ENABLE_PIN_HI (1 << 0)
#define STS2_DATA_OUT_RANGE (1 << 1)
#define STS2_RESTARTED_OK (1 << 1)
#define STS2_ISOLATION_TEST_FAIL (1 << 3)
#define STS2_HIGH_POWER_CAP (1 << 4)
#define STS2_INVALID_INSTR (1 << 5)
#define STS2_WILL_RESTART (1 << 6)
#define STS2_PEC_ERR (1 << 7)
/* Alarm register bits */
#define ALRM1_VIN_OUT_LIMIT (1 << 0)
#define ALRM1_VOUT_OUT_LIMIT (1 << 1)
#define ALRM1_OV_VOLT_SHUTDOWN (1 << 2)
#define ALRM1_VIN_OVERCURRENT (1 << 3)
#define ALRM1_TEMP_WARNING (1 << 4)
#define ALRM1_TEMP_SHUTDOWN (1 << 5)
#define ALRM1_PRIMARY_FAULT (1 << 6)
#define ALRM1_POWER_LIMIT (1 << 7)
#define ALRM2_5V_OUT_LIMIT (1 << 1)
#define ALRM2_TEMP_FAULT (1 << 2)
#define ALRM2_OV_LOW (1 << 3)
#define ALRM2_DCDC_TEMP_HIGH (1 << 4)
#define ALRM2_PRI_TEMP_HIGH (1 << 5)
#define ALRM2_NO_PRIMARY (1 << 6)
#define ALRM2_FAN_FAULT (1 << 7)
#define FIRMWARE_REV_LEN 4
#define DATA_STRING_LEN 9
#define INPUT_STRING_LEN 5 /* 4 for most devices */
#define FAN_SPEED_LEN 5
struct pem_data {
struct i2c_client *client;
const struct attribute_group *groups[4];
struct mutex update_lock;
bool valid;
bool fans_supported;
int input_length;
unsigned long last_updated; /* in jiffies */
u8 firmware_rev[FIRMWARE_REV_LEN];
u8 data_string[DATA_STRING_LEN];
u8 input_string[INPUT_STRING_LEN];
u8 fan_speed[FAN_SPEED_LEN];
};
static int pem_read_block(struct i2c_client *client, u8 command, u8 *data,
int data_len)
{
u8 block_buffer[I2C_SMBUS_BLOCK_MAX];
int result;
result = i2c_smbus_read_block_data(client, command, block_buffer);
if (unlikely(result < 0))
goto abort;
if (unlikely(result == 0xff || result != data_len)) {
result = -EIO;
goto abort;
}
memcpy(data, block_buffer, data_len);
result = 0;
abort:
return result;
}
static struct pem_data *pem_update_device(struct device *dev)
{
struct pem_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
struct pem_data *ret = data;
mutex_lock(&data->update_lock);
if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
int result;
/* Read data string */
result = pem_read_block(client, PEM_READ_DATA_STRING,
data->data_string,
sizeof(data->data_string));
if (unlikely(result < 0)) {
ret = ERR_PTR(result);
goto abort;
}
/* Read input string */
if (data->input_length) {
result = pem_read_block(client, PEM_READ_INPUT_STRING,
data->input_string,
data->input_length);
if (unlikely(result < 0)) {
ret = ERR_PTR(result);
goto abort;
}
}
/* Read fan speeds */
if (data->fans_supported) {
result = pem_read_block(client, PEM_READ_FAN_SPEED,
data->fan_speed,
sizeof(data->fan_speed));
if (unlikely(result < 0)) {
ret = ERR_PTR(result);
goto abort;
}
}
i2c_smbus_write_byte(client, PEM_CLEAR_INFO_FLAGS);
data->last_updated = jiffies;
data->valid = 1;
}
abort:
mutex_unlock(&data->update_lock);
return ret;
}
static long pem_get_data(u8 *data, int len, int index)
{
long val;
switch (index) {
case PEM_DATA_VOUT_LSB:
val = (data[index] + (data[index+1] << 8)) * 5 / 2;
break;
case PEM_DATA_CURRENT:
val = data[index] * 200;
break;
case PEM_DATA_TEMP:
val = data[index] * 1000;
break;
case PEM_DATA_TEMP_MAX:
val = 97 * 1000; /* 97 degrees C per datasheet */
break;
case PEM_DATA_TEMP_CRIT:
val = 107 * 1000; /* 107 degrees C per datasheet */
break;
default:
WARN_ON_ONCE(1);
val = 0;
}
return val;
}
static long pem_get_input(u8 *data, int len, int index)
{
long val;
switch (index) {
case PEM_INPUT_VOLTAGE:
if (len == INPUT_STRING_LEN)
val = (data[index] + (data[index+1] << 8) - 75) * 1000;
else
val = (data[index] - 75) * 1000;
break;
case PEM_INPUT_POWER_LSB:
if (len == INPUT_STRING_LEN)
index++;
val = (data[index] + (data[index+1] << 8)) * 1000000L;
break;
default:
WARN_ON_ONCE(1);
val = 0;
}
return val;
}
static long pem_get_fan(u8 *data, int len, int index)
{
long val;
switch (index) {
case PEM_FAN_FAN1:
case PEM_FAN_FAN2:
case PEM_FAN_FAN3:
val = data[index] * 100;
break;
default:
WARN_ON_ONCE(1);
val = 0;
}
return val;
}
/*
* Show boolean, either a fault or an alarm.
* .nr points to the register, .index is the bit mask to check
*/
static ssize_t pem_bool_show(struct device *dev, struct device_attribute *da,
char *buf)
{
struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(da);
struct pem_data *data = pem_update_device(dev);
u8 status;
if (IS_ERR(data))
return PTR_ERR(data);
status = data->data_string[attr->nr] & attr->index;
return snprintf(buf, PAGE_SIZE, "%d\n", !!status);
}
static ssize_t pem_data_show(struct device *dev, struct device_attribute *da,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
struct pem_data *data = pem_update_device(dev);
long value;
if (IS_ERR(data))
return PTR_ERR(data);
value = pem_get_data(data->data_string, sizeof(data->data_string),
attr->index);
return snprintf(buf, PAGE_SIZE, "%ld\n", value);
}
static ssize_t pem_input_show(struct device *dev, struct device_attribute *da,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
struct pem_data *data = pem_update_device(dev);
long value;
if (IS_ERR(data))
return PTR_ERR(data);
value = pem_get_input(data->input_string, sizeof(data->input_string),
attr->index);
return snprintf(buf, PAGE_SIZE, "%ld\n", value);
}
static ssize_t pem_fan_show(struct device *dev, struct device_attribute *da,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
struct pem_data *data = pem_update_device(dev);
long value;
if (IS_ERR(data))
return PTR_ERR(data);
value = pem_get_fan(data->fan_speed, sizeof(data->fan_speed),
attr->index);
return snprintf(buf, PAGE_SIZE, "%ld\n", value);
}
/* Voltages */
static SENSOR_DEVICE_ATTR_RO(in1_input, pem_data, PEM_DATA_VOUT_LSB);
static SENSOR_DEVICE_ATTR_2_RO(in1_alarm, pem_bool, PEM_DATA_ALARM_1,
ALRM1_VOUT_OUT_LIMIT);
static SENSOR_DEVICE_ATTR_2_RO(in1_crit_alarm, pem_bool, PEM_DATA_ALARM_1,
ALRM1_OV_VOLT_SHUTDOWN);
static SENSOR_DEVICE_ATTR_RO(in2_input, pem_input, PEM_INPUT_VOLTAGE);
static SENSOR_DEVICE_ATTR_2_RO(in2_alarm, pem_bool, PEM_DATA_ALARM_1,
ALRM1_VIN_OUT_LIMIT | ALRM1_PRIMARY_FAULT);
/* Currents */
static SENSOR_DEVICE_ATTR_RO(curr1_input, pem_data, PEM_DATA_CURRENT);
static SENSOR_DEVICE_ATTR_2_RO(curr1_alarm, pem_bool, PEM_DATA_ALARM_1,
ALRM1_VIN_OVERCURRENT);
/* Power */
static SENSOR_DEVICE_ATTR_RO(power1_input, pem_input, PEM_INPUT_POWER_LSB);
static SENSOR_DEVICE_ATTR_2_RO(power1_alarm, pem_bool, PEM_DATA_ALARM_1,
ALRM1_POWER_LIMIT);
/* Fans */
static SENSOR_DEVICE_ATTR_RO(fan1_input, pem_fan, PEM_FAN_FAN1);
static SENSOR_DEVICE_ATTR_RO(fan2_input, pem_fan, PEM_FAN_FAN2);
static SENSOR_DEVICE_ATTR_RO(fan3_input, pem_fan, PEM_FAN_FAN3);
static SENSOR_DEVICE_ATTR_2_RO(fan1_alarm, pem_bool, PEM_DATA_ALARM_2,
ALRM2_FAN_FAULT);
/* Temperatures */
static SENSOR_DEVICE_ATTR_RO(temp1_input, pem_data, PEM_DATA_TEMP);
static SENSOR_DEVICE_ATTR_RO(temp1_max, pem_data, PEM_DATA_TEMP_MAX);
static SENSOR_DEVICE_ATTR_RO(temp1_crit, pem_data, PEM_DATA_TEMP_CRIT);
static SENSOR_DEVICE_ATTR_2_RO(temp1_alarm, pem_bool, PEM_DATA_ALARM_1,
ALRM1_TEMP_WARNING);
static SENSOR_DEVICE_ATTR_2_RO(temp1_crit_alarm, pem_bool, PEM_DATA_ALARM_1,
ALRM1_TEMP_SHUTDOWN);
static SENSOR_DEVICE_ATTR_2_RO(temp1_fault, pem_bool, PEM_DATA_ALARM_2,
ALRM2_TEMP_FAULT);
static struct attribute *pem_attributes[] = {
&sensor_dev_attr_in1_input.dev_attr.attr,
&sensor_dev_attr_in1_alarm.dev_attr.attr,
&sensor_dev_attr_in1_crit_alarm.dev_attr.attr,
&sensor_dev_attr_in2_alarm.dev_attr.attr,
&sensor_dev_attr_curr1_alarm.dev_attr.attr,
&sensor_dev_attr_power1_alarm.dev_attr.attr,
&sensor_dev_attr_fan1_alarm.dev_attr.attr,
&sensor_dev_attr_temp1_input.dev_attr.attr,
&sensor_dev_attr_temp1_max.dev_attr.attr,
&sensor_dev_attr_temp1_crit.dev_attr.attr,
&sensor_dev_attr_temp1_alarm.dev_attr.attr,
&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
&sensor_dev_attr_temp1_fault.dev_attr.attr,
NULL,
};
static const struct attribute_group pem_group = {
.attrs = pem_attributes,
};
static struct attribute *pem_input_attributes[] = {
&sensor_dev_attr_in2_input.dev_attr.attr,
&sensor_dev_attr_curr1_input.dev_attr.attr,
&sensor_dev_attr_power1_input.dev_attr.attr,
NULL
};
static const struct attribute_group pem_input_group = {
.attrs = pem_input_attributes,
};
static struct attribute *pem_fan_attributes[] = {
&sensor_dev_attr_fan1_input.dev_attr.attr,
&sensor_dev_attr_fan2_input.dev_attr.attr,
&sensor_dev_attr_fan3_input.dev_attr.attr,
NULL
};
static const struct attribute_group pem_fan_group = {
.attrs = pem_fan_attributes,
};
static int pem_probe(struct i2c_client *client)
{
struct i2c_adapter *adapter = client->adapter;
struct device *dev = &client->dev;
struct device *hwmon_dev;
struct pem_data *data;
int ret, idx = 0;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BLOCK_DATA
| I2C_FUNC_SMBUS_WRITE_BYTE))
return -ENODEV;
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->client = client;
mutex_init(&data->update_lock);
/*
* We use the next two commands to determine if the device is really
* there.
*/
ret = pem_read_block(client, PEM_READ_FIRMWARE_REV,
data->firmware_rev, sizeof(data->firmware_rev));
if (ret < 0)
return ret;
ret = i2c_smbus_write_byte(client, PEM_CLEAR_INFO_FLAGS);
if (ret < 0)
return ret;
dev_info(dev, "Firmware revision %d.%d.%d\n",
data->firmware_rev[0], data->firmware_rev[1],
data->firmware_rev[2]);
/* sysfs hooks */
data->groups[idx++] = &pem_group;
/*
* Check if input readings are supported.
* This is the case if we can read input data,
* and if the returned data is not all zeros.
* Note that input alarms are always supported.
*/
ret = pem_read_block(client, PEM_READ_INPUT_STRING,
data->input_string,
sizeof(data->input_string) - 1);
if (!ret && (data->input_string[0] || data->input_string[1] ||
data->input_string[2]))
data->input_length = sizeof(data->input_string) - 1;
else if (ret < 0) {
/* Input string is one byte longer for some devices */
ret = pem_read_block(client, PEM_READ_INPUT_STRING,
data->input_string,
sizeof(data->input_string));
if (!ret && (data->input_string[0] || data->input_string[1] ||
data->input_string[2] || data->input_string[3]))
data->input_length = sizeof(data->input_string);
}
if (data->input_length)
data->groups[idx++] = &pem_input_group;
/*
* Check if fan speed readings are supported.
* This is the case if we can read fan speed data,
* and if the returned data is not all zeros.
* Note that the fan alarm is always supported.
*/
ret = pem_read_block(client, PEM_READ_FAN_SPEED,
data->fan_speed,
sizeof(data->fan_speed));
if (!ret && (data->fan_speed[0] || data->fan_speed[1] ||
data->fan_speed[2] || data->fan_speed[3])) {
data->fans_supported = true;
data->groups[idx++] = &pem_fan_group;
}
hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
data, data->groups);
return PTR_ERR_OR_ZERO(hwmon_dev);
}
static const struct i2c_device_id pem_id[] = {
{"lineage_pem", 0},
{}
};
MODULE_DEVICE_TABLE(i2c, pem_id);
static struct i2c_driver pem_driver = {
.driver = {
.name = "lineage_pem",
},
.probe_new = pem_probe,
.id_table = pem_id,
};
module_i2c_driver(pem_driver);
MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
MODULE_DESCRIPTION("Lineage CPL PEM hardware monitoring driver");
MODULE_LICENSE("GPL");
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