mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-28 13:34:38 +08:00
1f4d4af4d7
coccicheck complains about the use of snprintf() in sysfs
show functions.
drivers/hwmon/ina3221.c:701:8-16: WARNING: use scnprintf or sprintf
This results in a large number of patch submissions. Fix it all in
one go using the following coccinelle rules. Use sysfs_emit instead
of scnprintf or sprintf since that makes more sense.
@depends on patch@
identifier show, dev, attr, buf;
@@
ssize_t show(struct device *dev, struct device_attribute *attr, char *buf)
{
<...
return
- snprintf(buf, \( PAGE_SIZE \| PAGE_SIZE - 1 \),
+ sysfs_emit(buf,
...);
...>
}
@depends on patch@
identifier show, dev, attr, buf, rc;
@@
ssize_t show(struct device *dev, struct device_attribute *attr, char *buf)
{
<...
rc =
- snprintf(buf, \( PAGE_SIZE \| PAGE_SIZE - 1 \),
+ sysfs_emit(buf,
...);
...>
}
While at it, remove unnecessary braces and as well as unnecessary
else after return statements to address checkpatch warnings in the
resulting patch.
Cc: Zihao Tang <tangzihao1@hisilicon.com>
Cc: Jay Fang <f.fangjian@huawei.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
222 lines
6.1 KiB
C
222 lines
6.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* Driver for Linear Technology LTC4222 Dual Hot Swap controller
|
|
*
|
|
* Copyright (c) 2014 Guenter Roeck
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/err.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/hwmon.h>
|
|
#include <linux/hwmon-sysfs.h>
|
|
#include <linux/jiffies.h>
|
|
#include <linux/regmap.h>
|
|
|
|
/* chip registers */
|
|
|
|
#define LTC4222_CONTROL1 0xd0
|
|
#define LTC4222_ALERT1 0xd1
|
|
#define LTC4222_STATUS1 0xd2
|
|
#define LTC4222_FAULT1 0xd3
|
|
#define LTC4222_CONTROL2 0xd4
|
|
#define LTC4222_ALERT2 0xd5
|
|
#define LTC4222_STATUS2 0xd6
|
|
#define LTC4222_FAULT2 0xd7
|
|
#define LTC4222_SOURCE1 0xd8
|
|
#define LTC4222_SOURCE2 0xda
|
|
#define LTC4222_ADIN1 0xdc
|
|
#define LTC4222_ADIN2 0xde
|
|
#define LTC4222_SENSE1 0xe0
|
|
#define LTC4222_SENSE2 0xe2
|
|
#define LTC4222_ADC_CONTROL 0xe4
|
|
|
|
/*
|
|
* Fault register bits
|
|
*/
|
|
#define FAULT_OV BIT(0)
|
|
#define FAULT_UV BIT(1)
|
|
#define FAULT_OC BIT(2)
|
|
#define FAULT_POWER_BAD BIT(3)
|
|
#define FAULT_FET_BAD BIT(5)
|
|
|
|
/* Return the voltage from the given register in mV or mA */
|
|
static int ltc4222_get_value(struct device *dev, u8 reg)
|
|
{
|
|
struct regmap *regmap = dev_get_drvdata(dev);
|
|
unsigned int val;
|
|
u8 buf[2];
|
|
int ret;
|
|
|
|
ret = regmap_bulk_read(regmap, reg, buf, 2);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
val = ((buf[0] << 8) + buf[1]) >> 6;
|
|
|
|
switch (reg) {
|
|
case LTC4222_ADIN1:
|
|
case LTC4222_ADIN2:
|
|
/* 1.25 mV resolution. Convert to mV. */
|
|
val = DIV_ROUND_CLOSEST(val * 5, 4);
|
|
break;
|
|
case LTC4222_SOURCE1:
|
|
case LTC4222_SOURCE2:
|
|
/* 31.25 mV resolution. Convert to mV. */
|
|
val = DIV_ROUND_CLOSEST(val * 125, 4);
|
|
break;
|
|
case LTC4222_SENSE1:
|
|
case LTC4222_SENSE2:
|
|
/*
|
|
* 62.5 uV resolution. Convert to current as measured with
|
|
* an 1 mOhm sense resistor, in mA. If a different sense
|
|
* resistor is installed, calculate the actual current by
|
|
* dividing the reported current by the sense resistor value
|
|
* in mOhm.
|
|
*/
|
|
val = DIV_ROUND_CLOSEST(val * 125, 2);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
return val;
|
|
}
|
|
|
|
static ssize_t ltc4222_value_show(struct device *dev,
|
|
struct device_attribute *da, char *buf)
|
|
{
|
|
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
|
|
int value;
|
|
|
|
value = ltc4222_get_value(dev, attr->index);
|
|
if (value < 0)
|
|
return value;
|
|
return sysfs_emit(buf, "%d\n", value);
|
|
}
|
|
|
|
static ssize_t ltc4222_bool_show(struct device *dev,
|
|
struct device_attribute *da, char *buf)
|
|
{
|
|
struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(da);
|
|
struct regmap *regmap = dev_get_drvdata(dev);
|
|
unsigned int fault;
|
|
int ret;
|
|
|
|
ret = regmap_read(regmap, attr->nr, &fault);
|
|
if (ret < 0)
|
|
return ret;
|
|
fault &= attr->index;
|
|
if (fault) /* Clear reported faults in chip register */
|
|
regmap_update_bits(regmap, attr->nr, attr->index, 0);
|
|
|
|
return sysfs_emit(buf, "%d\n", !!fault);
|
|
}
|
|
|
|
/* Voltages */
|
|
static SENSOR_DEVICE_ATTR_RO(in1_input, ltc4222_value, LTC4222_SOURCE1);
|
|
static SENSOR_DEVICE_ATTR_RO(in2_input, ltc4222_value, LTC4222_ADIN1);
|
|
static SENSOR_DEVICE_ATTR_RO(in3_input, ltc4222_value, LTC4222_SOURCE2);
|
|
static SENSOR_DEVICE_ATTR_RO(in4_input, ltc4222_value, LTC4222_ADIN2);
|
|
|
|
/*
|
|
* Voltage alarms
|
|
* UV/OV faults are associated with the input voltage, and power bad and fet
|
|
* faults are associated with the output voltage.
|
|
*/
|
|
static SENSOR_DEVICE_ATTR_2_RO(in1_min_alarm, ltc4222_bool, LTC4222_FAULT1,
|
|
FAULT_UV);
|
|
static SENSOR_DEVICE_ATTR_2_RO(in1_max_alarm, ltc4222_bool, LTC4222_FAULT1,
|
|
FAULT_OV);
|
|
static SENSOR_DEVICE_ATTR_2_RO(in2_alarm, ltc4222_bool, LTC4222_FAULT1,
|
|
FAULT_POWER_BAD | FAULT_FET_BAD);
|
|
|
|
static SENSOR_DEVICE_ATTR_2_RO(in3_min_alarm, ltc4222_bool, LTC4222_FAULT2,
|
|
FAULT_UV);
|
|
static SENSOR_DEVICE_ATTR_2_RO(in3_max_alarm, ltc4222_bool, LTC4222_FAULT2,
|
|
FAULT_OV);
|
|
static SENSOR_DEVICE_ATTR_2_RO(in4_alarm, ltc4222_bool, LTC4222_FAULT2,
|
|
FAULT_POWER_BAD | FAULT_FET_BAD);
|
|
|
|
/* Current (via sense resistor) */
|
|
static SENSOR_DEVICE_ATTR_RO(curr1_input, ltc4222_value, LTC4222_SENSE1);
|
|
static SENSOR_DEVICE_ATTR_RO(curr2_input, ltc4222_value, LTC4222_SENSE2);
|
|
|
|
/* Overcurrent alarm */
|
|
static SENSOR_DEVICE_ATTR_2_RO(curr1_max_alarm, ltc4222_bool, LTC4222_FAULT1,
|
|
FAULT_OC);
|
|
static SENSOR_DEVICE_ATTR_2_RO(curr2_max_alarm, ltc4222_bool, LTC4222_FAULT2,
|
|
FAULT_OC);
|
|
|
|
static struct attribute *ltc4222_attrs[] = {
|
|
&sensor_dev_attr_in1_input.dev_attr.attr,
|
|
&sensor_dev_attr_in1_min_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_in1_max_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_in2_input.dev_attr.attr,
|
|
&sensor_dev_attr_in2_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_in3_input.dev_attr.attr,
|
|
&sensor_dev_attr_in3_min_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_in3_max_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_in4_input.dev_attr.attr,
|
|
&sensor_dev_attr_in4_alarm.dev_attr.attr,
|
|
|
|
&sensor_dev_attr_curr1_input.dev_attr.attr,
|
|
&sensor_dev_attr_curr1_max_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_curr2_input.dev_attr.attr,
|
|
&sensor_dev_attr_curr2_max_alarm.dev_attr.attr,
|
|
|
|
NULL,
|
|
};
|
|
ATTRIBUTE_GROUPS(ltc4222);
|
|
|
|
static const struct regmap_config ltc4222_regmap_config = {
|
|
.reg_bits = 8,
|
|
.val_bits = 8,
|
|
.max_register = LTC4222_ADC_CONTROL,
|
|
};
|
|
|
|
static int ltc4222_probe(struct i2c_client *client)
|
|
{
|
|
struct device *dev = &client->dev;
|
|
struct device *hwmon_dev;
|
|
struct regmap *regmap;
|
|
|
|
regmap = devm_regmap_init_i2c(client, <c4222_regmap_config);
|
|
if (IS_ERR(regmap)) {
|
|
dev_err(dev, "failed to allocate register map\n");
|
|
return PTR_ERR(regmap);
|
|
}
|
|
|
|
/* Clear faults */
|
|
regmap_write(regmap, LTC4222_FAULT1, 0x00);
|
|
regmap_write(regmap, LTC4222_FAULT2, 0x00);
|
|
|
|
hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
|
|
regmap,
|
|
ltc4222_groups);
|
|
return PTR_ERR_OR_ZERO(hwmon_dev);
|
|
}
|
|
|
|
static const struct i2c_device_id ltc4222_id[] = {
|
|
{"ltc4222", 0},
|
|
{ }
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(i2c, ltc4222_id);
|
|
|
|
static struct i2c_driver ltc4222_driver = {
|
|
.driver = {
|
|
.name = "ltc4222",
|
|
},
|
|
.probe_new = ltc4222_probe,
|
|
.id_table = ltc4222_id,
|
|
};
|
|
|
|
module_i2c_driver(ltc4222_driver);
|
|
|
|
MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
|
|
MODULE_DESCRIPTION("LTC4222 driver");
|
|
MODULE_LICENSE("GPL");
|