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linux-next/drivers/hwmon/lm95241.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
/*
* Copyright (C) 2008, 2010 Davide Rizzo <elpa.rizzo@gmail.com>
*
* The LM95241 is a sensor chip made by National Semiconductors.
* It reports up to three temperatures (its own plus up to two external ones).
* Complete datasheet can be obtained from National's website at:
* http://www.national.com/ds.cgi/LM/LM95241.pdf
*/
#include <linux/bitops.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/jiffies.h>
#include <linux/hwmon.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#define DEVNAME "lm95241"
static const unsigned short normal_i2c[] = {
0x19, 0x2a, 0x2b, I2C_CLIENT_END };
/* LM95241 registers */
#define LM95241_REG_R_MAN_ID 0xFE
#define LM95241_REG_R_CHIP_ID 0xFF
#define LM95241_REG_R_STATUS 0x02
#define LM95241_REG_RW_CONFIG 0x03
#define LM95241_REG_RW_REM_FILTER 0x06
#define LM95241_REG_RW_TRUTHERM 0x07
#define LM95241_REG_W_ONE_SHOT 0x0F
#define LM95241_REG_R_LOCAL_TEMPH 0x10
#define LM95241_REG_R_REMOTE1_TEMPH 0x11
#define LM95241_REG_R_REMOTE2_TEMPH 0x12
#define LM95241_REG_R_LOCAL_TEMPL 0x20
#define LM95241_REG_R_REMOTE1_TEMPL 0x21
#define LM95241_REG_R_REMOTE2_TEMPL 0x22
#define LM95241_REG_RW_REMOTE_MODEL 0x30
/* LM95241 specific bitfields */
#define CFG_STOP BIT(6)
#define CFG_CR0076 0x00
#define CFG_CR0182 BIT(4)
#define CFG_CR1000 BIT(5)
#define CFG_CR2700 (BIT(4) | BIT(5))
#define CFG_CRMASK (BIT(4) | BIT(5))
#define R1MS_MASK BIT(0)
#define R2MS_MASK BIT(2)
#define R1DF_MASK BIT(1)
#define R2DF_MASK BIT(2)
#define R1FE_MASK BIT(0)
#define R2FE_MASK BIT(2)
#define R1DM BIT(0)
#define R2DM BIT(1)
#define TT1_SHIFT 0
#define TT2_SHIFT 4
#define TT_OFF 0
#define TT_ON 1
#define TT_MASK 7
#define NATSEMI_MAN_ID 0x01
#define LM95231_CHIP_ID 0xA1
#define LM95241_CHIP_ID 0xA4
static const u8 lm95241_reg_address[] = {
LM95241_REG_R_LOCAL_TEMPH,
LM95241_REG_R_LOCAL_TEMPL,
LM95241_REG_R_REMOTE1_TEMPH,
LM95241_REG_R_REMOTE1_TEMPL,
LM95241_REG_R_REMOTE2_TEMPH,
LM95241_REG_R_REMOTE2_TEMPL
};
/* Client data (each client gets its own) */
struct lm95241_data {
struct i2c_client *client;
struct mutex update_lock;
unsigned long last_updated; /* in jiffies */
unsigned long interval; /* in milli-seconds */
char valid; /* zero until following fields are valid */
/* registers values */
u8 temp[ARRAY_SIZE(lm95241_reg_address)];
u8 status, config, model, trutherm;
};
/* Conversions */
static int temp_from_reg_signed(u8 val_h, u8 val_l)
{
s16 val_hl = (val_h << 8) | val_l;
return val_hl * 1000 / 256;
}
static int temp_from_reg_unsigned(u8 val_h, u8 val_l)
{
u16 val_hl = (val_h << 8) | val_l;
return val_hl * 1000 / 256;
}
static struct lm95241_data *lm95241_update_device(struct device *dev)
{
struct lm95241_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
mutex_lock(&data->update_lock);
if (time_after(jiffies, data->last_updated
+ msecs_to_jiffies(data->interval)) ||
!data->valid) {
int i;
dev_dbg(dev, "Updating lm95241 data.\n");
for (i = 0; i < ARRAY_SIZE(lm95241_reg_address); i++)
data->temp[i]
= i2c_smbus_read_byte_data(client,
lm95241_reg_address[i]);
data->status = i2c_smbus_read_byte_data(client,
LM95241_REG_R_STATUS);
data->last_updated = jiffies;
data->valid = 1;
}
mutex_unlock(&data->update_lock);
return data;
}
static int lm95241_read_chip(struct device *dev, u32 attr, int channel,
long *val)
{
struct lm95241_data *data = dev_get_drvdata(dev);
switch (attr) {
case hwmon_chip_update_interval:
*val = data->interval;
return 0;
default:
return -EOPNOTSUPP;
}
}
static int lm95241_read_temp(struct device *dev, u32 attr, int channel,
long *val)
{
struct lm95241_data *data = lm95241_update_device(dev);
switch (attr) {
case hwmon_temp_input:
if (!channel || (data->config & BIT(channel - 1)))
*val = temp_from_reg_signed(data->temp[channel * 2],
data->temp[channel * 2 + 1]);
else
*val = temp_from_reg_unsigned(data->temp[channel * 2],
data->temp[channel * 2 + 1]);
return 0;
case hwmon_temp_min:
if (channel == 1)
*val = (data->config & R1DF_MASK) ? -128000 : 0;
else
*val = (data->config & R2DF_MASK) ? -128000 : 0;
return 0;
case hwmon_temp_max:
if (channel == 1)
*val = (data->config & R1DF_MASK) ? 127875 : 255875;
else
*val = (data->config & R2DF_MASK) ? 127875 : 255875;
return 0;
case hwmon_temp_type:
if (channel == 1)
*val = (data->model & R1MS_MASK) ? 1 : 2;
else
*val = (data->model & R2MS_MASK) ? 1 : 2;
return 0;
case hwmon_temp_fault:
if (channel == 1)
*val = !!(data->status & R1DM);
else
*val = !!(data->status & R2DM);
return 0;
default:
return -EOPNOTSUPP;
}
}
static int lm95241_read(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long *val)
{
switch (type) {
case hwmon_chip:
return lm95241_read_chip(dev, attr, channel, val);
case hwmon_temp:
return lm95241_read_temp(dev, attr, channel, val);
default:
return -EOPNOTSUPP;
}
}
static int lm95241_write_chip(struct device *dev, u32 attr, int channel,
long val)
{
struct lm95241_data *data = dev_get_drvdata(dev);
int convrate;
u8 config;
int ret;
mutex_lock(&data->update_lock);
switch (attr) {
case hwmon_chip_update_interval:
config = data->config & ~CFG_CRMASK;
if (val < 130) {
convrate = 76;
config |= CFG_CR0076;
} else if (val < 590) {
convrate = 182;
config |= CFG_CR0182;
} else if (val < 1850) {
convrate = 1000;
config |= CFG_CR1000;
} else {
convrate = 2700;
config |= CFG_CR2700;
}
data->interval = convrate;
data->config = config;
ret = i2c_smbus_write_byte_data(data->client,
LM95241_REG_RW_CONFIG, config);
break;
default:
ret = -EOPNOTSUPP;
break;
}
mutex_unlock(&data->update_lock);
return ret;
}
static int lm95241_write_temp(struct device *dev, u32 attr, int channel,
long val)
{
struct lm95241_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
int ret;
mutex_lock(&data->update_lock);
switch (attr) {
case hwmon_temp_min:
if (channel == 1) {
if (val < 0)
data->config |= R1DF_MASK;
else
data->config &= ~R1DF_MASK;
} else {
if (val < 0)
data->config |= R2DF_MASK;
else
data->config &= ~R2DF_MASK;
}
data->valid = 0;
ret = i2c_smbus_write_byte_data(client, LM95241_REG_RW_CONFIG,
data->config);
break;
case hwmon_temp_max:
if (channel == 1) {
if (val <= 127875)
data->config |= R1DF_MASK;
else
data->config &= ~R1DF_MASK;
} else {
if (val <= 127875)
data->config |= R2DF_MASK;
else
data->config &= ~R2DF_MASK;
}
data->valid = 0;
ret = i2c_smbus_write_byte_data(client, LM95241_REG_RW_CONFIG,
data->config);
break;
case hwmon_temp_type:
if (val != 1 && val != 2) {
ret = -EINVAL;
break;
}
if (channel == 1) {
data->trutherm &= ~(TT_MASK << TT1_SHIFT);
if (val == 1) {
data->model |= R1MS_MASK;
data->trutherm |= (TT_ON << TT1_SHIFT);
} else {
data->model &= ~R1MS_MASK;
data->trutherm |= (TT_OFF << TT1_SHIFT);
}
} else {
data->trutherm &= ~(TT_MASK << TT2_SHIFT);
if (val == 1) {
data->model |= R2MS_MASK;
data->trutherm |= (TT_ON << TT2_SHIFT);
} else {
data->model &= ~R2MS_MASK;
data->trutherm |= (TT_OFF << TT2_SHIFT);
}
}
ret = i2c_smbus_write_byte_data(client,
LM95241_REG_RW_REMOTE_MODEL,
data->model);
if (ret < 0)
break;
ret = i2c_smbus_write_byte_data(client, LM95241_REG_RW_TRUTHERM,
data->trutherm);
break;
default:
ret = -EOPNOTSUPP;
break;
}
mutex_unlock(&data->update_lock);
return ret;
}
static int lm95241_write(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long val)
{
switch (type) {
case hwmon_chip:
return lm95241_write_chip(dev, attr, channel, val);
case hwmon_temp:
return lm95241_write_temp(dev, attr, channel, val);
default:
return -EOPNOTSUPP;
}
}
static umode_t lm95241_is_visible(const void *data,
enum hwmon_sensor_types type,
u32 attr, int channel)
{
switch (type) {
case hwmon_chip:
switch (attr) {
case hwmon_chip_update_interval:
return 0644;
}
break;
case hwmon_temp:
switch (attr) {
case hwmon_temp_input:
return 0444;
case hwmon_temp_fault:
return 0444;
case hwmon_temp_min:
case hwmon_temp_max:
case hwmon_temp_type:
return 0644;
}
break;
default:
break;
}
return 0;
}
/* Return 0 if detection is successful, -ENODEV otherwise */
static int lm95241_detect(struct i2c_client *new_client,
struct i2c_board_info *info)
{
struct i2c_adapter *adapter = new_client->adapter;
const char *name;
int mfg_id, chip_id;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -ENODEV;
mfg_id = i2c_smbus_read_byte_data(new_client, LM95241_REG_R_MAN_ID);
if (mfg_id != NATSEMI_MAN_ID)
return -ENODEV;
chip_id = i2c_smbus_read_byte_data(new_client, LM95241_REG_R_CHIP_ID);
switch (chip_id) {
case LM95231_CHIP_ID:
name = "lm95231";
break;
case LM95241_CHIP_ID:
name = "lm95241";
break;
default:
return -ENODEV;
}
/* Fill the i2c board info */
strlcpy(info->type, name, I2C_NAME_SIZE);
return 0;
}
static void lm95241_init_client(struct i2c_client *client,
struct lm95241_data *data)
{
data->interval = 1000;
data->config = CFG_CR1000;
data->trutherm = (TT_OFF << TT1_SHIFT) | (TT_OFF << TT2_SHIFT);
i2c_smbus_write_byte_data(client, LM95241_REG_RW_CONFIG, data->config);
i2c_smbus_write_byte_data(client, LM95241_REG_RW_REM_FILTER,
R1FE_MASK | R2FE_MASK);
i2c_smbus_write_byte_data(client, LM95241_REG_RW_TRUTHERM,
data->trutherm);
i2c_smbus_write_byte_data(client, LM95241_REG_RW_REMOTE_MODEL,
data->model);
}
static const struct hwmon_channel_info *lm95241_info[] = {
HWMON_CHANNEL_INFO(chip,
HWMON_C_UPDATE_INTERVAL),
HWMON_CHANNEL_INFO(temp,
HWMON_T_INPUT,
HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MIN |
HWMON_T_TYPE | HWMON_T_FAULT,
HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MIN |
HWMON_T_TYPE | HWMON_T_FAULT),
NULL
};
static const struct hwmon_ops lm95241_hwmon_ops = {
.is_visible = lm95241_is_visible,
.read = lm95241_read,
.write = lm95241_write,
};
static const struct hwmon_chip_info lm95241_chip_info = {
.ops = &lm95241_hwmon_ops,
.info = lm95241_info,
};
static int lm95241_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct lm95241_data *data;
struct device *hwmon_dev;
data = devm_kzalloc(dev, sizeof(struct lm95241_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->client = client;
mutex_init(&data->update_lock);
/* Initialize the LM95241 chip */
lm95241_init_client(client, data);
hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
data,
&lm95241_chip_info,
NULL);
return PTR_ERR_OR_ZERO(hwmon_dev);
}
/* Driver data (common to all clients) */
static const struct i2c_device_id lm95241_id[] = {
{ "lm95231", 0 },
{ "lm95241", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, lm95241_id);
static struct i2c_driver lm95241_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = DEVNAME,
},
.probe_new = lm95241_probe,
.id_table = lm95241_id,
.detect = lm95241_detect,
.address_list = normal_i2c,
};
module_i2c_driver(lm95241_driver);
MODULE_AUTHOR("Davide Rizzo <elpa.rizzo@gmail.com>");
MODULE_DESCRIPTION("LM95231/LM95241 sensor driver");
MODULE_LICENSE("GPL");
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