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linux-stable/drivers/hwmon/emc6w201.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
/*
* emc6w201.c - Hardware monitoring driver for the SMSC EMC6W201
* Copyright (C) 2011 Jean Delvare <jdelvare@suse.de>
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.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>
/*
* Addresses to scan
*/
static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
/*
* The EMC6W201 registers
*/
#define EMC6W201_REG_IN(nr) (0x20 + (nr))
#define EMC6W201_REG_TEMP(nr) (0x26 + (nr))
#define EMC6W201_REG_FAN(nr) (0x2C + (nr) * 2)
#define EMC6W201_REG_COMPANY 0x3E
#define EMC6W201_REG_VERSTEP 0x3F
#define EMC6W201_REG_CONFIG 0x40
#define EMC6W201_REG_IN_LOW(nr) (0x4A + (nr) * 2)
#define EMC6W201_REG_IN_HIGH(nr) (0x4B + (nr) * 2)
#define EMC6W201_REG_TEMP_LOW(nr) (0x56 + (nr) * 2)
#define EMC6W201_REG_TEMP_HIGH(nr) (0x57 + (nr) * 2)
#define EMC6W201_REG_FAN_MIN(nr) (0x62 + (nr) * 2)
enum subfeature { input, min, max };
/*
* Per-device data
*/
struct emc6w201_data {
struct i2c_client *client;
struct mutex update_lock;
char valid; /* zero until following fields are valid */
unsigned long last_updated; /* in jiffies */
/* registers values */
u8 in[3][6];
s8 temp[3][6];
u16 fan[2][5];
};
/*
* Combine LSB and MSB registers in a single value
* Locking: must be called with data->update_lock held
*/
static u16 emc6w201_read16(struct i2c_client *client, u8 reg)
{
int lsb, msb;
lsb = i2c_smbus_read_byte_data(client, reg);
msb = i2c_smbus_read_byte_data(client, reg + 1);
if (unlikely(lsb < 0 || msb < 0)) {
dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n",
16, "read", reg);
return 0xFFFF; /* Arbitrary value */
}
return (msb << 8) | lsb;
}
/*
* Write 16-bit value to LSB and MSB registers
* Locking: must be called with data->update_lock held
*/
static int emc6w201_write16(struct i2c_client *client, u8 reg, u16 val)
{
int err;
err = i2c_smbus_write_byte_data(client, reg, val & 0xff);
if (likely(!err))
err = i2c_smbus_write_byte_data(client, reg + 1, val >> 8);
if (unlikely(err < 0))
dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n",
16, "write", reg);
return err;
}
/* Read 8-bit value from register */
static u8 emc6w201_read8(struct i2c_client *client, u8 reg)
{
int val;
val = i2c_smbus_read_byte_data(client, reg);
if (unlikely(val < 0)) {
dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n",
8, "read", reg);
return 0x00; /* Arbitrary value */
}
return val;
}
/* Write 8-bit value to register */
static int emc6w201_write8(struct i2c_client *client, u8 reg, u8 val)
{
int err;
err = i2c_smbus_write_byte_data(client, reg, val);
if (unlikely(err < 0))
dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n",
8, "write", reg);
return err;
}
static struct emc6w201_data *emc6w201_update_device(struct device *dev)
{
struct emc6w201_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
int nr;
mutex_lock(&data->update_lock);
if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
for (nr = 0; nr < 6; nr++) {
data->in[input][nr] =
emc6w201_read8(client,
EMC6W201_REG_IN(nr));
data->in[min][nr] =
emc6w201_read8(client,
EMC6W201_REG_IN_LOW(nr));
data->in[max][nr] =
emc6w201_read8(client,
EMC6W201_REG_IN_HIGH(nr));
}
for (nr = 0; nr < 6; nr++) {
data->temp[input][nr] =
emc6w201_read8(client,
EMC6W201_REG_TEMP(nr));
data->temp[min][nr] =
emc6w201_read8(client,
EMC6W201_REG_TEMP_LOW(nr));
data->temp[max][nr] =
emc6w201_read8(client,
EMC6W201_REG_TEMP_HIGH(nr));
}
for (nr = 0; nr < 5; nr++) {
data->fan[input][nr] =
emc6w201_read16(client,
EMC6W201_REG_FAN(nr));
data->fan[min][nr] =
emc6w201_read16(client,
EMC6W201_REG_FAN_MIN(nr));
}
data->last_updated = jiffies;
data->valid = 1;
}
mutex_unlock(&data->update_lock);
return data;
}
/*
* Sysfs callback functions
*/
static const s16 nominal_mv[6] = { 2500, 1500, 3300, 5000, 1500, 1500 };
static ssize_t in_show(struct device *dev, struct device_attribute *devattr,
char *buf)
{
struct emc6w201_data *data = emc6w201_update_device(dev);
int sf = to_sensor_dev_attr_2(devattr)->index;
int nr = to_sensor_dev_attr_2(devattr)->nr;
return sprintf(buf, "%u\n",
(unsigned)data->in[sf][nr] * nominal_mv[nr] / 0xC0);
}
static ssize_t in_store(struct device *dev, struct device_attribute *devattr,
const char *buf, size_t count)
{
struct emc6w201_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
int sf = to_sensor_dev_attr_2(devattr)->index;
int nr = to_sensor_dev_attr_2(devattr)->nr;
int err;
long val;
u8 reg;
err = kstrtol(buf, 10, &val);
if (err < 0)
return err;
val = clamp_val(val, 0, 255 * nominal_mv[nr] / 192);
val = DIV_ROUND_CLOSEST(val * 192, nominal_mv[nr]);
reg = (sf == min) ? EMC6W201_REG_IN_LOW(nr)
: EMC6W201_REG_IN_HIGH(nr);
mutex_lock(&data->update_lock);
data->in[sf][nr] = val;
err = emc6w201_write8(client, reg, data->in[sf][nr]);
mutex_unlock(&data->update_lock);
return err < 0 ? err : count;
}
static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
char *buf)
{
struct emc6w201_data *data = emc6w201_update_device(dev);
int sf = to_sensor_dev_attr_2(devattr)->index;
int nr = to_sensor_dev_attr_2(devattr)->nr;
return sprintf(buf, "%d\n", (int)data->temp[sf][nr] * 1000);
}
static ssize_t temp_store(struct device *dev,
struct device_attribute *devattr, const char *buf,
size_t count)
{
struct emc6w201_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
int sf = to_sensor_dev_attr_2(devattr)->index;
int nr = to_sensor_dev_attr_2(devattr)->nr;
int err;
long val;
u8 reg;
err = kstrtol(buf, 10, &val);
if (err < 0)
return err;
val = clamp_val(val, -127000, 127000);
val = DIV_ROUND_CLOSEST(val, 1000);
reg = (sf == min) ? EMC6W201_REG_TEMP_LOW(nr)
: EMC6W201_REG_TEMP_HIGH(nr);
mutex_lock(&data->update_lock);
data->temp[sf][nr] = val;
err = emc6w201_write8(client, reg, data->temp[sf][nr]);
mutex_unlock(&data->update_lock);
return err < 0 ? err : count;
}
static ssize_t fan_show(struct device *dev, struct device_attribute *devattr,
char *buf)
{
struct emc6w201_data *data = emc6w201_update_device(dev);
int sf = to_sensor_dev_attr_2(devattr)->index;
int nr = to_sensor_dev_attr_2(devattr)->nr;
unsigned rpm;
if (data->fan[sf][nr] == 0 || data->fan[sf][nr] == 0xFFFF)
rpm = 0;
else
rpm = 5400000U / data->fan[sf][nr];
return sprintf(buf, "%u\n", rpm);
}
static ssize_t fan_store(struct device *dev, struct device_attribute *devattr,
const char *buf, size_t count)
{
struct emc6w201_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
int sf = to_sensor_dev_attr_2(devattr)->index;
int nr = to_sensor_dev_attr_2(devattr)->nr;
int err;
unsigned long val;
err = kstrtoul(buf, 10, &val);
if (err < 0)
return err;
if (val == 0) {
val = 0xFFFF;
} else {
val = DIV_ROUND_CLOSEST(5400000U, val);
val = clamp_val(val, 0, 0xFFFE);
}
mutex_lock(&data->update_lock);
data->fan[sf][nr] = val;
err = emc6w201_write16(client, EMC6W201_REG_FAN_MIN(nr),
data->fan[sf][nr]);
mutex_unlock(&data->update_lock);
return err < 0 ? err : count;
}
static SENSOR_DEVICE_ATTR_2_RO(in0_input, in, 0, input);
static SENSOR_DEVICE_ATTR_2_RW(in0_min, in, 0, min);
static SENSOR_DEVICE_ATTR_2_RW(in0_max, in, 0, max);
static SENSOR_DEVICE_ATTR_2_RO(in1_input, in, 1, input);
static SENSOR_DEVICE_ATTR_2_RW(in1_min, in, 1, min);
static SENSOR_DEVICE_ATTR_2_RW(in1_max, in, 1, max);
static SENSOR_DEVICE_ATTR_2_RO(in2_input, in, 2, input);
static SENSOR_DEVICE_ATTR_2_RW(in2_min, in, 2, min);
static SENSOR_DEVICE_ATTR_2_RW(in2_max, in, 2, max);
static SENSOR_DEVICE_ATTR_2_RO(in3_input, in, 3, input);
static SENSOR_DEVICE_ATTR_2_RW(in3_min, in, 3, min);
static SENSOR_DEVICE_ATTR_2_RW(in3_max, in, 3, max);
static SENSOR_DEVICE_ATTR_2_RO(in4_input, in, 4, input);
static SENSOR_DEVICE_ATTR_2_RW(in4_min, in, 4, min);
static SENSOR_DEVICE_ATTR_2_RW(in4_max, in, 4, max);
static SENSOR_DEVICE_ATTR_2_RO(in5_input, in, 5, input);
static SENSOR_DEVICE_ATTR_2_RW(in5_min, in, 5, min);
static SENSOR_DEVICE_ATTR_2_RW(in5_max, in, 5, max);
static SENSOR_DEVICE_ATTR_2_RO(temp1_input, temp, 0, input);
static SENSOR_DEVICE_ATTR_2_RW(temp1_min, temp, 0, min);
static SENSOR_DEVICE_ATTR_2_RW(temp1_max, temp, 0, max);
static SENSOR_DEVICE_ATTR_2_RO(temp2_input, temp, 1, input);
static SENSOR_DEVICE_ATTR_2_RW(temp2_min, temp, 1, min);
static SENSOR_DEVICE_ATTR_2_RW(temp2_max, temp, 1, max);
static SENSOR_DEVICE_ATTR_2_RO(temp3_input, temp, 2, input);
static SENSOR_DEVICE_ATTR_2_RW(temp3_min, temp, 2, min);
static SENSOR_DEVICE_ATTR_2_RW(temp3_max, temp, 2, max);
static SENSOR_DEVICE_ATTR_2_RO(temp4_input, temp, 3, input);
static SENSOR_DEVICE_ATTR_2_RW(temp4_min, temp, 3, min);
static SENSOR_DEVICE_ATTR_2_RW(temp4_max, temp, 3, max);
static SENSOR_DEVICE_ATTR_2_RO(temp5_input, temp, 4, input);
static SENSOR_DEVICE_ATTR_2_RW(temp5_min, temp, 4, min);
static SENSOR_DEVICE_ATTR_2_RW(temp5_max, temp, 4, max);
static SENSOR_DEVICE_ATTR_2_RO(temp6_input, temp, 5, input);
static SENSOR_DEVICE_ATTR_2_RW(temp6_min, temp, 5, min);
static SENSOR_DEVICE_ATTR_2_RW(temp6_max, temp, 5, max);
static SENSOR_DEVICE_ATTR_2_RO(fan1_input, fan, 0, input);
static SENSOR_DEVICE_ATTR_2_RW(fan1_min, fan, 0, min);
static SENSOR_DEVICE_ATTR_2_RO(fan2_input, fan, 1, input);
static SENSOR_DEVICE_ATTR_2_RW(fan2_min, fan, 1, min);
static SENSOR_DEVICE_ATTR_2_RO(fan3_input, fan, 2, input);
static SENSOR_DEVICE_ATTR_2_RW(fan3_min, fan, 2, min);
static SENSOR_DEVICE_ATTR_2_RO(fan4_input, fan, 3, input);
static SENSOR_DEVICE_ATTR_2_RW(fan4_min, fan, 3, min);
static SENSOR_DEVICE_ATTR_2_RO(fan5_input, fan, 4, input);
static SENSOR_DEVICE_ATTR_2_RW(fan5_min, fan, 4, min);
static struct attribute *emc6w201_attrs[] = {
&sensor_dev_attr_in0_input.dev_attr.attr,
&sensor_dev_attr_in0_min.dev_attr.attr,
&sensor_dev_attr_in0_max.dev_attr.attr,
&sensor_dev_attr_in1_input.dev_attr.attr,
&sensor_dev_attr_in1_min.dev_attr.attr,
&sensor_dev_attr_in1_max.dev_attr.attr,
&sensor_dev_attr_in2_input.dev_attr.attr,
&sensor_dev_attr_in2_min.dev_attr.attr,
&sensor_dev_attr_in2_max.dev_attr.attr,
&sensor_dev_attr_in3_input.dev_attr.attr,
&sensor_dev_attr_in3_min.dev_attr.attr,
&sensor_dev_attr_in3_max.dev_attr.attr,
&sensor_dev_attr_in4_input.dev_attr.attr,
&sensor_dev_attr_in4_min.dev_attr.attr,
&sensor_dev_attr_in4_max.dev_attr.attr,
&sensor_dev_attr_in5_input.dev_attr.attr,
&sensor_dev_attr_in5_min.dev_attr.attr,
&sensor_dev_attr_in5_max.dev_attr.attr,
&sensor_dev_attr_temp1_input.dev_attr.attr,
&sensor_dev_attr_temp1_min.dev_attr.attr,
&sensor_dev_attr_temp1_max.dev_attr.attr,
&sensor_dev_attr_temp2_input.dev_attr.attr,
&sensor_dev_attr_temp2_min.dev_attr.attr,
&sensor_dev_attr_temp2_max.dev_attr.attr,
&sensor_dev_attr_temp3_input.dev_attr.attr,
&sensor_dev_attr_temp3_min.dev_attr.attr,
&sensor_dev_attr_temp3_max.dev_attr.attr,
&sensor_dev_attr_temp4_input.dev_attr.attr,
&sensor_dev_attr_temp4_min.dev_attr.attr,
&sensor_dev_attr_temp4_max.dev_attr.attr,
&sensor_dev_attr_temp5_input.dev_attr.attr,
&sensor_dev_attr_temp5_min.dev_attr.attr,
&sensor_dev_attr_temp5_max.dev_attr.attr,
&sensor_dev_attr_temp6_input.dev_attr.attr,
&sensor_dev_attr_temp6_min.dev_attr.attr,
&sensor_dev_attr_temp6_max.dev_attr.attr,
&sensor_dev_attr_fan1_input.dev_attr.attr,
&sensor_dev_attr_fan1_min.dev_attr.attr,
&sensor_dev_attr_fan2_input.dev_attr.attr,
&sensor_dev_attr_fan2_min.dev_attr.attr,
&sensor_dev_attr_fan3_input.dev_attr.attr,
&sensor_dev_attr_fan3_min.dev_attr.attr,
&sensor_dev_attr_fan4_input.dev_attr.attr,
&sensor_dev_attr_fan4_min.dev_attr.attr,
&sensor_dev_attr_fan5_input.dev_attr.attr,
&sensor_dev_attr_fan5_min.dev_attr.attr,
NULL
};
ATTRIBUTE_GROUPS(emc6w201);
/*
* Driver interface
*/
/* Return 0 if detection is successful, -ENODEV otherwise */
static int emc6w201_detect(struct i2c_client *client,
struct i2c_board_info *info)
{
struct i2c_adapter *adapter = client->adapter;
int company, verstep, config;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -ENODEV;
/* Identification */
company = i2c_smbus_read_byte_data(client, EMC6W201_REG_COMPANY);
if (company != 0x5C)
return -ENODEV;
verstep = i2c_smbus_read_byte_data(client, EMC6W201_REG_VERSTEP);
if (verstep < 0 || (verstep & 0xF0) != 0xB0)
return -ENODEV;
if ((verstep & 0x0F) > 2) {
dev_dbg(&client->dev, "Unknown EMC6W201 stepping %d\n",
verstep & 0x0F);
return -ENODEV;
}
/* Check configuration */
config = i2c_smbus_read_byte_data(client, EMC6W201_REG_CONFIG);
if (config < 0 || (config & 0xF4) != 0x04)
return -ENODEV;
if (!(config & 0x01)) {
dev_err(&client->dev, "Monitoring not enabled\n");
return -ENODEV;
}
strlcpy(info->type, "emc6w201", I2C_NAME_SIZE);
return 0;
}
static int emc6w201_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct emc6w201_data *data;
struct device *hwmon_dev;
data = devm_kzalloc(dev, sizeof(struct emc6w201_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->client = client;
mutex_init(&data->update_lock);
hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
data,
emc6w201_groups);
return PTR_ERR_OR_ZERO(hwmon_dev);
}
static const struct i2c_device_id emc6w201_id[] = {
{ "emc6w201", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, emc6w201_id);
static struct i2c_driver emc6w201_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "emc6w201",
},
.probe_new = emc6w201_probe,
.id_table = emc6w201_id,
.detect = emc6w201_detect,
.address_list = normal_i2c,
};
module_i2c_driver(emc6w201_driver);
MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
MODULE_DESCRIPTION("SMSC EMC6W201 hardware monitoring driver");
MODULE_LICENSE("GPL");
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