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linux/drivers/hwmon/lm78.c
Andrew Davis e49d1a1d33 hwmon: (lm78) Remove use of i2c_match_id() 
The function i2c_match_id() is used to fetch the matching ID from
the i2c_device_id table. This is often used to then retrieve the
matching driver_data. This can be done in one step with the helper
i2c_get_match_data().

This helper has a couple other benefits:
 * It doesn't need the i2c_device_id passed in so we do not need
   to have that forward declared, allowing us to remove those or
   move the i2c_device_id table down to its more natural spot
   with the other module info.
 * It also checks for device match data, which allows for OF and
   ACPI based probing. That means we do not have to manually check
   those first and can remove those checks.

Signed-off-by: Andrew Davis <afd@ti.com>
Link: https://lore.kernel.org/r/20240403203633.914389-15-afd@ti.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2024-06-08 16:07:33 -07:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* lm78.c - Part of lm_sensors, Linux kernel modules for hardware
* monitoring
* Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl>
* Copyright (c) 2007, 2011 Jean Delvare <jdelvare@suse.de>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#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-vid.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.h>
#ifdef CONFIG_ISA
#include <linux/platform_device.h>
#include <linux/ioport.h>
#include <linux/io.h>
#endif
/* Addresses to scan */
static const unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d,
0x2e, 0x2f, I2C_CLIENT_END };
enum chips { lm78, lm79 };
/* Many LM78 constants specified below */
/* Length of ISA address segment */
#define LM78_EXTENT 8
/* Where are the ISA address/data registers relative to the base address */
#define LM78_ADDR_REG_OFFSET 5
#define LM78_DATA_REG_OFFSET 6
/* The LM78 registers */
#define LM78_REG_IN_MAX(nr) (0x2b + (nr) * 2)
#define LM78_REG_IN_MIN(nr) (0x2c + (nr) * 2)
#define LM78_REG_IN(nr) (0x20 + (nr))
#define LM78_REG_FAN_MIN(nr) (0x3b + (nr))
#define LM78_REG_FAN(nr) (0x28 + (nr))
#define LM78_REG_TEMP 0x27
#define LM78_REG_TEMP_OVER 0x39
#define LM78_REG_TEMP_HYST 0x3a
#define LM78_REG_ALARM1 0x41
#define LM78_REG_ALARM2 0x42
#define LM78_REG_VID_FANDIV 0x47
#define LM78_REG_CONFIG 0x40
#define LM78_REG_CHIPID 0x49
#define LM78_REG_I2C_ADDR 0x48
/*
* Conversions. Rounding and limit checking is only done on the TO_REG
* variants.
*/
/*
* IN: mV (0V to 4.08V)
* REG: 16mV/bit
*/
static inline u8 IN_TO_REG(unsigned long val)
{
unsigned long nval = clamp_val(val, 0, 4080);
return (nval + 8) / 16;
}
#define IN_FROM_REG(val) ((val) * 16)
static inline u8 FAN_TO_REG(long rpm, int div)
{
if (rpm <= 0)
return 255;
if (rpm > 1350000)
return 1;
return clamp_val((1350000 + rpm * div / 2) / (rpm * div), 1, 254);
}
static inline int FAN_FROM_REG(u8 val, int div)
{
return val == 0 ? -1 : val == 255 ? 0 : 1350000 / (val * div);
}
/*
* TEMP: mC (-128C to +127C)
* REG: 1C/bit, two's complement
*/
static inline s8 TEMP_TO_REG(long val)
{
int nval = clamp_val(val, -128000, 127000) ;
return nval < 0 ? (nval - 500) / 1000 : (nval + 500) / 1000;
}
static inline int TEMP_FROM_REG(s8 val)
{
return val * 1000;
}
#define DIV_FROM_REG(val) (1 << (val))
struct lm78_data {
struct i2c_client *client;
struct mutex lock;
enum chips type;
/* For ISA device only */
const char *name;
int isa_addr;
struct mutex update_lock;
bool valid; /* true if following fields are valid */
unsigned long last_updated; /* In jiffies */
u8 in[7]; /* Register value */
u8 in_max[7]; /* Register value */
u8 in_min[7]; /* Register value */
u8 fan[3]; /* Register value */
u8 fan_min[3]; /* Register value */
s8 temp; /* Register value */
s8 temp_over; /* Register value */
s8 temp_hyst; /* Register value */
u8 fan_div[3]; /* Register encoding, shifted right */
u8 vid; /* Register encoding, combined */
u16 alarms; /* Register encoding, combined */
};
static int lm78_read_value(struct lm78_data *data, u8 reg);
static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value);
static struct lm78_data *lm78_update_device(struct device *dev);
static void lm78_init_device(struct lm78_data *data);
/* 7 Voltages */
static ssize_t in_show(struct device *dev, struct device_attribute *da,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
struct lm78_data *data = lm78_update_device(dev);
return sprintf(buf, "%d\n", IN_FROM_REG(data->in[attr->index]));
}
static ssize_t in_min_show(struct device *dev, struct device_attribute *da,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
struct lm78_data *data = lm78_update_device(dev);
return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[attr->index]));
}
static ssize_t in_max_show(struct device *dev, struct device_attribute *da,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
struct lm78_data *data = lm78_update_device(dev);
return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[attr->index]));
}
static ssize_t in_min_store(struct device *dev, struct device_attribute *da,
const char *buf, size_t count)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
struct lm78_data *data = dev_get_drvdata(dev);
int nr = attr->index;
unsigned long val;
int err;
err = kstrtoul(buf, 10, &val);
if (err)
return err;
mutex_lock(&data->update_lock);
data->in_min[nr] = IN_TO_REG(val);
lm78_write_value(data, LM78_REG_IN_MIN(nr), data->in_min[nr]);
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t in_max_store(struct device *dev, struct device_attribute *da,
const char *buf, size_t count)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
struct lm78_data *data = dev_get_drvdata(dev);
int nr = attr->index;
unsigned long val;
int err;
err = kstrtoul(buf, 10, &val);
if (err)
return err;
mutex_lock(&data->update_lock);
data->in_max[nr] = IN_TO_REG(val);
lm78_write_value(data, LM78_REG_IN_MAX(nr), data->in_max[nr]);
mutex_unlock(&data->update_lock);
return count;
}
static SENSOR_DEVICE_ATTR_RO(in0_input, in, 0);
static SENSOR_DEVICE_ATTR_RW(in0_min, in_min, 0);
static SENSOR_DEVICE_ATTR_RW(in0_max, in_max, 0);
static SENSOR_DEVICE_ATTR_RO(in1_input, in, 1);
static SENSOR_DEVICE_ATTR_RW(in1_min, in_min, 1);
static SENSOR_DEVICE_ATTR_RW(in1_max, in_max, 1);
static SENSOR_DEVICE_ATTR_RO(in2_input, in, 2);
static SENSOR_DEVICE_ATTR_RW(in2_min, in_min, 2);
static SENSOR_DEVICE_ATTR_RW(in2_max, in_max, 2);
static SENSOR_DEVICE_ATTR_RO(in3_input, in, 3);
static SENSOR_DEVICE_ATTR_RW(in3_min, in_min, 3);
static SENSOR_DEVICE_ATTR_RW(in3_max, in_max, 3);
static SENSOR_DEVICE_ATTR_RO(in4_input, in, 4);
static SENSOR_DEVICE_ATTR_RW(in4_min, in_min, 4);
static SENSOR_DEVICE_ATTR_RW(in4_max, in_max, 4);
static SENSOR_DEVICE_ATTR_RO(in5_input, in, 5);
static SENSOR_DEVICE_ATTR_RW(in5_min, in_min, 5);
static SENSOR_DEVICE_ATTR_RW(in5_max, in_max, 5);
static SENSOR_DEVICE_ATTR_RO(in6_input, in, 6);
static SENSOR_DEVICE_ATTR_RW(in6_min, in_min, 6);
static SENSOR_DEVICE_ATTR_RW(in6_max, in_max, 6);
/* Temperature */
static ssize_t temp1_input_show(struct device *dev,
struct device_attribute *da, char *buf)
{
struct lm78_data *data = lm78_update_device(dev);
return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp));
}
static ssize_t temp1_max_show(struct device *dev, struct device_attribute *da,
char *buf)
{
struct lm78_data *data = lm78_update_device(dev);
return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_over));
}
static ssize_t temp1_max_store(struct device *dev,
struct device_attribute *da, const char *buf,
size_t count)
{
struct lm78_data *data = dev_get_drvdata(dev);
long val;
int err;
err = kstrtol(buf, 10, &val);
if (err)
return err;
mutex_lock(&data->update_lock);
data->temp_over = TEMP_TO_REG(val);
lm78_write_value(data, LM78_REG_TEMP_OVER, data->temp_over);
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t temp1_max_hyst_show(struct device *dev,
struct device_attribute *da, char *buf)
{
struct lm78_data *data = lm78_update_device(dev);
return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_hyst));
}
static ssize_t temp1_max_hyst_store(struct device *dev,
struct device_attribute *da,
const char *buf, size_t count)
{
struct lm78_data *data = dev_get_drvdata(dev);
long val;
int err;
err = kstrtol(buf, 10, &val);
if (err)
return err;
mutex_lock(&data->update_lock);
data->temp_hyst = TEMP_TO_REG(val);
lm78_write_value(data, LM78_REG_TEMP_HYST, data->temp_hyst);
mutex_unlock(&data->update_lock);
return count;
}
static DEVICE_ATTR_RO(temp1_input);
static DEVICE_ATTR_RW(temp1_max);
static DEVICE_ATTR_RW(temp1_max_hyst);
/* 3 Fans */
static ssize_t fan_show(struct device *dev, struct device_attribute *da,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
struct lm78_data *data = lm78_update_device(dev);
int nr = attr->index;
return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
DIV_FROM_REG(data->fan_div[nr])));
}
static ssize_t fan_min_show(struct device *dev, struct device_attribute *da,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
struct lm78_data *data = lm78_update_device(dev);
int nr = attr->index;
return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
DIV_FROM_REG(data->fan_div[nr])));
}
static ssize_t fan_min_store(struct device *dev, struct device_attribute *da,
const char *buf, size_t count)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
struct lm78_data *data = dev_get_drvdata(dev);
int nr = attr->index;
unsigned long val;
int err;
err = kstrtoul(buf, 10, &val);
if (err)
return err;
mutex_lock(&data->update_lock);
data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
lm78_write_value(data, LM78_REG_FAN_MIN(nr), data->fan_min[nr]);
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t fan_div_show(struct device *dev, struct device_attribute *da,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
struct lm78_data *data = lm78_update_device(dev);
return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[attr->index]));
}
/*
* Note: we save and restore the fan minimum here, because its value is
* determined in part by the fan divisor. This follows the principle of
* least surprise; the user doesn't expect the fan minimum to change just
* because the divisor changed.
*/
static ssize_t fan_div_store(struct device *dev, struct device_attribute *da,
const char *buf, size_t count)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
struct lm78_data *data = dev_get_drvdata(dev);
int nr = attr->index;
unsigned long min;
u8 reg;
unsigned long val;
int err;
err = kstrtoul(buf, 10, &val);
if (err)
return err;
mutex_lock(&data->update_lock);
min = FAN_FROM_REG(data->fan_min[nr],
DIV_FROM_REG(data->fan_div[nr]));
switch (val) {
case 1:
data->fan_div[nr] = 0;
break;
case 2:
data->fan_div[nr] = 1;
break;
case 4:
data->fan_div[nr] = 2;
break;
case 8:
data->fan_div[nr] = 3;
break;
default:
dev_err(dev,
"fan_div value %ld not supported. Choose one of 1, 2, 4 or 8!\n",
val);
mutex_unlock(&data->update_lock);
return -EINVAL;
}
reg = lm78_read_value(data, LM78_REG_VID_FANDIV);
switch (nr) {
case 0:
reg = (reg & 0xcf) | (data->fan_div[nr] << 4);
break;
case 1:
reg = (reg & 0x3f) | (data->fan_div[nr] << 6);
break;
}
lm78_write_value(data, LM78_REG_VID_FANDIV, reg);
data->fan_min[nr] =
FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
lm78_write_value(data, LM78_REG_FAN_MIN(nr), data->fan_min[nr]);
mutex_unlock(&data->update_lock);
return count;
}
static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, 0);
static SENSOR_DEVICE_ATTR_RW(fan1_min, fan_min, 0);
static SENSOR_DEVICE_ATTR_RO(fan2_input, fan, 1);
static SENSOR_DEVICE_ATTR_RW(fan2_min, fan_min, 1);
static SENSOR_DEVICE_ATTR_RO(fan3_input, fan, 2);
static SENSOR_DEVICE_ATTR_RW(fan3_min, fan_min, 2);
/* Fan 3 divisor is locked in H/W */
static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0);
static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1);
static SENSOR_DEVICE_ATTR_RO(fan3_div, fan_div, 2);
/* VID */
static ssize_t cpu0_vid_show(struct device *dev, struct device_attribute *da,
char *buf)
{
struct lm78_data *data = lm78_update_device(dev);
return sprintf(buf, "%d\n", vid_from_reg(data->vid, 82));
}
static DEVICE_ATTR_RO(cpu0_vid);
/* Alarms */
static ssize_t alarms_show(struct device *dev, struct device_attribute *da,
char *buf)
{
struct lm78_data *data = lm78_update_device(dev);
return sprintf(buf, "%u\n", data->alarms);
}
static DEVICE_ATTR_RO(alarms);
static ssize_t alarm_show(struct device *dev, struct device_attribute *da,
char *buf)
{
struct lm78_data *data = lm78_update_device(dev);
int nr = to_sensor_dev_attr(da)->index;
return sprintf(buf, "%u\n", (data->alarms >> nr) & 1);
}
static SENSOR_DEVICE_ATTR_RO(in0_alarm, alarm, 0);
static SENSOR_DEVICE_ATTR_RO(in1_alarm, alarm, 1);
static SENSOR_DEVICE_ATTR_RO(in2_alarm, alarm, 2);
static SENSOR_DEVICE_ATTR_RO(in3_alarm, alarm, 3);
static SENSOR_DEVICE_ATTR_RO(in4_alarm, alarm, 8);
static SENSOR_DEVICE_ATTR_RO(in5_alarm, alarm, 9);
static SENSOR_DEVICE_ATTR_RO(in6_alarm, alarm, 10);
static SENSOR_DEVICE_ATTR_RO(fan1_alarm, alarm, 6);
static SENSOR_DEVICE_ATTR_RO(fan2_alarm, alarm, 7);
static SENSOR_DEVICE_ATTR_RO(fan3_alarm, alarm, 11);
static SENSOR_DEVICE_ATTR_RO(temp1_alarm, alarm, 4);
static struct attribute *lm78_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_in0_alarm.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_in1_alarm.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_in2_alarm.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_in3_alarm.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_in4_alarm.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_in5_alarm.dev_attr.attr,
&sensor_dev_attr_in6_input.dev_attr.attr,
&sensor_dev_attr_in6_min.dev_attr.attr,
&sensor_dev_attr_in6_max.dev_attr.attr,
&sensor_dev_attr_in6_alarm.dev_attr.attr,
&dev_attr_temp1_input.attr,
&dev_attr_temp1_max.attr,
&dev_attr_temp1_max_hyst.attr,
&sensor_dev_attr_temp1_alarm.dev_attr.attr,
&sensor_dev_attr_fan1_input.dev_attr.attr,
&sensor_dev_attr_fan1_min.dev_attr.attr,
&sensor_dev_attr_fan1_div.dev_attr.attr,
&sensor_dev_attr_fan1_alarm.dev_attr.attr,
&sensor_dev_attr_fan2_input.dev_attr.attr,
&sensor_dev_attr_fan2_min.dev_attr.attr,
&sensor_dev_attr_fan2_div.dev_attr.attr,
&sensor_dev_attr_fan2_alarm.dev_attr.attr,
&sensor_dev_attr_fan3_input.dev_attr.attr,
&sensor_dev_attr_fan3_min.dev_attr.attr,
&sensor_dev_attr_fan3_div.dev_attr.attr,
&sensor_dev_attr_fan3_alarm.dev_attr.attr,
&dev_attr_alarms.attr,
&dev_attr_cpu0_vid.attr,
NULL
};
ATTRIBUTE_GROUPS(lm78);
/*
* ISA related code
*/
#ifdef CONFIG_ISA
/* ISA device, if found */
static struct platform_device *pdev;
static unsigned short isa_address = 0x290;
static struct lm78_data *lm78_data_if_isa(void)
{
return pdev ? platform_get_drvdata(pdev) : NULL;
}
/* Returns 1 if the I2C chip appears to be an alias of the ISA chip */
static int lm78_alias_detect(struct i2c_client *client, u8 chipid)
{
struct lm78_data *isa;
int i;
if (!pdev) /* No ISA chip */
return 0;
isa = platform_get_drvdata(pdev);
if (lm78_read_value(isa, LM78_REG_I2C_ADDR) != client->addr)
return 0; /* Address doesn't match */
if ((lm78_read_value(isa, LM78_REG_CHIPID) & 0xfe) != (chipid & 0xfe))
return 0; /* Chip type doesn't match */
/*
* We compare all the limit registers, the config register and the
* interrupt mask registers
*/
for (i = 0x2b; i <= 0x3d; i++) {
if (lm78_read_value(isa, i) !=
i2c_smbus_read_byte_data(client, i))
return 0;
}
if (lm78_read_value(isa, LM78_REG_CONFIG) !=
i2c_smbus_read_byte_data(client, LM78_REG_CONFIG))
return 0;
for (i = 0x43; i <= 0x46; i++) {
if (lm78_read_value(isa, i) !=
i2c_smbus_read_byte_data(client, i))
return 0;
}
return 1;
}
#else /* !CONFIG_ISA */
static int lm78_alias_detect(struct i2c_client *client, u8 chipid)
{
return 0;
}
static struct lm78_data *lm78_data_if_isa(void)
{
return NULL;
}
#endif /* CONFIG_ISA */
static int lm78_i2c_detect(struct i2c_client *client,
struct i2c_board_info *info)
{
int i;
struct lm78_data *isa = lm78_data_if_isa();
const char *client_name;
struct i2c_adapter *adapter = client->adapter;
int address = client->addr;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -ENODEV;
/*
* We block updates of the ISA device to minimize the risk of
* concurrent access to the same LM78 chip through different
* interfaces.
*/
if (isa)
mutex_lock(&isa->update_lock);
if ((i2c_smbus_read_byte_data(client, LM78_REG_CONFIG) & 0x80)
|| i2c_smbus_read_byte_data(client, LM78_REG_I2C_ADDR) != address)
goto err_nodev;
/* Explicitly prevent the misdetection of Winbond chips */
i = i2c_smbus_read_byte_data(client, 0x4f);
if (i == 0xa3 || i == 0x5c)
goto err_nodev;
/* Determine the chip type. */
i = i2c_smbus_read_byte_data(client, LM78_REG_CHIPID);
if (i == 0x00 || i == 0x20 /* LM78 */
|| i == 0x40) /* LM78-J */
client_name = "lm78";
else if ((i & 0xfe) == 0xc0)
client_name = "lm79";
else
goto err_nodev;
if (lm78_alias_detect(client, i)) {
dev_dbg(&adapter->dev,
"Device at 0x%02x appears to be the same as ISA device\n",
address);
goto err_nodev;
}
if (isa)
mutex_unlock(&isa->update_lock);
strscpy(info->type, client_name, I2C_NAME_SIZE);
return 0;
err_nodev:
if (isa)
mutex_unlock(&isa->update_lock);
return -ENODEV;
}
static int lm78_i2c_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct device *hwmon_dev;
struct lm78_data *data;
data = devm_kzalloc(dev, sizeof(struct lm78_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->client = client;
data->type = (uintptr_t)i2c_get_match_data(client);
/* Initialize the LM78 chip */
lm78_init_device(data);
hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
data, lm78_groups);
return PTR_ERR_OR_ZERO(hwmon_dev);
}
static const struct i2c_device_id lm78_i2c_id[] = {
{ "lm78", lm78 },
{ "lm79", lm79 },
{ }
};
MODULE_DEVICE_TABLE(i2c, lm78_i2c_id);
static struct i2c_driver lm78_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "lm78",
},
.probe = lm78_i2c_probe,
.id_table = lm78_i2c_id,
.detect = lm78_i2c_detect,
.address_list = normal_i2c,
};
/*
* The SMBus locks itself, but ISA access must be locked explicitly!
* We don't want to lock the whole ISA bus, so we lock each client
* separately.
* We ignore the LM78 BUSY flag at this moment - it could lead to deadlocks,
* would slow down the LM78 access and should not be necessary.
*/
static int lm78_read_value(struct lm78_data *data, u8 reg)
{
struct i2c_client *client = data->client;
#ifdef CONFIG_ISA
if (!client) { /* ISA device */
int res;
mutex_lock(&data->lock);
outb_p(reg, data->isa_addr + LM78_ADDR_REG_OFFSET);
res = inb_p(data->isa_addr + LM78_DATA_REG_OFFSET);
mutex_unlock(&data->lock);
return res;
} else
#endif
return i2c_smbus_read_byte_data(client, reg);
}
static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value)
{
struct i2c_client *client = data->client;
#ifdef CONFIG_ISA
if (!client) { /* ISA device */
mutex_lock(&data->lock);
outb_p(reg, data->isa_addr + LM78_ADDR_REG_OFFSET);
outb_p(value, data->isa_addr + LM78_DATA_REG_OFFSET);
mutex_unlock(&data->lock);
return 0;
} else
#endif
return i2c_smbus_write_byte_data(client, reg, value);
}
static void lm78_init_device(struct lm78_data *data)
{
u8 config;
int i;
/* Start monitoring */
config = lm78_read_value(data, LM78_REG_CONFIG);
if ((config & 0x09) != 0x01)
lm78_write_value(data, LM78_REG_CONFIG,
(config & 0xf7) | 0x01);
/* A few vars need to be filled upon startup */
for (i = 0; i < 3; i++) {
data->fan_min[i] = lm78_read_value(data,
LM78_REG_FAN_MIN(i));
}
mutex_init(&data->update_lock);
}
static struct lm78_data *lm78_update_device(struct device *dev)
{
struct lm78_data *data = dev_get_drvdata(dev);
int i;
mutex_lock(&data->update_lock);
if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
|| !data->valid) {
dev_dbg(dev, "Starting lm78 update\n");
for (i = 0; i <= 6; i++) {
data->in[i] =
lm78_read_value(data, LM78_REG_IN(i));
data->in_min[i] =
lm78_read_value(data, LM78_REG_IN_MIN(i));
data->in_max[i] =
lm78_read_value(data, LM78_REG_IN_MAX(i));
}
for (i = 0; i < 3; i++) {
data->fan[i] =
lm78_read_value(data, LM78_REG_FAN(i));
data->fan_min[i] =
lm78_read_value(data, LM78_REG_FAN_MIN(i));
}
data->temp = lm78_read_value(data, LM78_REG_TEMP);
data->temp_over =
lm78_read_value(data, LM78_REG_TEMP_OVER);
data->temp_hyst =
lm78_read_value(data, LM78_REG_TEMP_HYST);
i = lm78_read_value(data, LM78_REG_VID_FANDIV);
data->vid = i & 0x0f;
if (data->type == lm79)
data->vid |=
(lm78_read_value(data, LM78_REG_CHIPID) &
0x01) << 4;
else
data->vid |= 0x10;
data->fan_div[0] = (i >> 4) & 0x03;
data->fan_div[1] = i >> 6;
data->alarms = lm78_read_value(data, LM78_REG_ALARM1) +
(lm78_read_value(data, LM78_REG_ALARM2) << 8);
data->last_updated = jiffies;
data->valid = true;
data->fan_div[2] = 1;
}
mutex_unlock(&data->update_lock);
return data;
}
#ifdef CONFIG_ISA
static int lm78_isa_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device *hwmon_dev;
struct lm78_data *data;
struct resource *res;
/* Reserve the ISA region */
res = platform_get_resource(pdev, IORESOURCE_IO, 0);
if (!devm_request_region(dev, res->start + LM78_ADDR_REG_OFFSET,
2, "lm78"))
return -EBUSY;
data = devm_kzalloc(dev, sizeof(struct lm78_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
mutex_init(&data->lock);
data->isa_addr = res->start;
platform_set_drvdata(pdev, data);
if (lm78_read_value(data, LM78_REG_CHIPID) & 0x80) {
data->type = lm79;
data->name = "lm79";
} else {
data->type = lm78;
data->name = "lm78";
}
/* Initialize the LM78 chip */
lm78_init_device(data);
hwmon_dev = devm_hwmon_device_register_with_groups(dev, data->name,
data, lm78_groups);
return PTR_ERR_OR_ZERO(hwmon_dev);
}
static struct platform_driver lm78_isa_driver = {
.driver = {
.name = "lm78",
},
.probe = lm78_isa_probe,
};
/* return 1 if a supported chip is found, 0 otherwise */
static int __init lm78_isa_found(unsigned short address)
{
int val, save, found = 0;
int port;
/*
* Some boards declare base+0 to base+7 as a PNP device, some base+4
* to base+7 and some base+5 to base+6. So we better request each port
* individually for the probing phase.
*/
for (port = address; port < address + LM78_EXTENT; port++) {
if (!request_region(port, 1, "lm78")) {
pr_debug("Failed to request port 0x%x\n", port);
goto release;
}
}
#define REALLY_SLOW_IO
/*
* We need the timeouts for at least some LM78-like
* chips. But only if we read 'undefined' registers.
*/
val = inb_p(address + 1);
if (inb_p(address + 2) != val
|| inb_p(address + 3) != val
|| inb_p(address + 7) != val)
goto release;
#undef REALLY_SLOW_IO
/*
* We should be able to change the 7 LSB of the address port. The
* MSB (busy flag) should be clear initially, set after the write.
*/
save = inb_p(address + LM78_ADDR_REG_OFFSET);
if (save & 0x80)
goto release;
val = ~save & 0x7f;
outb_p(val, address + LM78_ADDR_REG_OFFSET);
if (inb_p(address + LM78_ADDR_REG_OFFSET) != (val | 0x80)) {
outb_p(save, address + LM78_ADDR_REG_OFFSET);
goto release;
}
/* We found a device, now see if it could be an LM78 */
outb_p(LM78_REG_CONFIG, address + LM78_ADDR_REG_OFFSET);
val = inb_p(address + LM78_DATA_REG_OFFSET);
if (val & 0x80)
goto release;
outb_p(LM78_REG_I2C_ADDR, address + LM78_ADDR_REG_OFFSET);
val = inb_p(address + LM78_DATA_REG_OFFSET);
if (val < 0x03 || val > 0x77) /* Not a valid I2C address */
goto release;
/* The busy flag should be clear again */
if (inb_p(address + LM78_ADDR_REG_OFFSET) & 0x80)
goto release;
/* Explicitly prevent the misdetection of Winbond chips */
outb_p(0x4f, address + LM78_ADDR_REG_OFFSET);
val = inb_p(address + LM78_DATA_REG_OFFSET);
if (val == 0xa3 || val == 0x5c)
goto release;
/* Explicitly prevent the misdetection of ITE chips */
outb_p(0x58, address + LM78_ADDR_REG_OFFSET);
val = inb_p(address + LM78_DATA_REG_OFFSET);
if (val == 0x90)
goto release;
/* Determine the chip type */
outb_p(LM78_REG_CHIPID, address + LM78_ADDR_REG_OFFSET);
val = inb_p(address + LM78_DATA_REG_OFFSET);
if (val == 0x00 || val == 0x20 /* LM78 */
|| val == 0x40 /* LM78-J */
|| (val & 0xfe) == 0xc0) /* LM79 */
found = 1;
if (found)
pr_info("Found an %s chip at %#x\n",
val & 0x80 ? "LM79" : "LM78", (int)address);
release:
for (port--; port >= address; port--)
release_region(port, 1);
return found;
}
static int __init lm78_isa_device_add(unsigned short address)
{
struct resource res = {
.start = address,
.end = address + LM78_EXTENT - 1,
.name = "lm78",
.flags = IORESOURCE_IO,
};
int err;
pdev = platform_device_alloc("lm78", address);
if (!pdev) {
err = -ENOMEM;
pr_err("Device allocation failed\n");
goto exit;
}
err = platform_device_add_resources(pdev, &res, 1);
if (err) {
pr_err("Device resource addition failed (%d)\n", err);
goto exit_device_put;
}
err = platform_device_add(pdev);
if (err) {
pr_err("Device addition failed (%d)\n", err);
goto exit_device_put;
}
return 0;
exit_device_put:
platform_device_put(pdev);
exit:
pdev = NULL;
return err;
}
static int __init lm78_isa_register(void)
{
int res;
if (lm78_isa_found(isa_address)) {
res = platform_driver_register(&lm78_isa_driver);
if (res)
goto exit;
/* Sets global pdev as a side effect */
res = lm78_isa_device_add(isa_address);
if (res)
goto exit_unreg_isa_driver;
}
return 0;
exit_unreg_isa_driver:
platform_driver_unregister(&lm78_isa_driver);
exit:
return res;
}
static void lm78_isa_unregister(void)
{
if (pdev) {
platform_device_unregister(pdev);
platform_driver_unregister(&lm78_isa_driver);
}
}
#else /* !CONFIG_ISA */
static int __init lm78_isa_register(void)
{
return 0;
}
static void lm78_isa_unregister(void)
{
}
#endif /* CONFIG_ISA */
static int __init sm_lm78_init(void)
{
int res;
/*
* We register the ISA device first, so that we can skip the
* registration of an I2C interface to the same device.
*/
res = lm78_isa_register();
if (res)
goto exit;
res = i2c_add_driver(&lm78_driver);
if (res)
goto exit_unreg_isa_device;
return 0;
exit_unreg_isa_device:
lm78_isa_unregister();
exit:
return res;
}
static void __exit sm_lm78_exit(void)
{
lm78_isa_unregister();
i2c_del_driver(&lm78_driver);
}
MODULE_AUTHOR("Frodo Looijaard, Jean Delvare <jdelvare@suse.de>");
MODULE_DESCRIPTION("LM78/LM79 driver");
MODULE_LICENSE("GPL");
module_init(sm_lm78_init);
module_exit(sm_lm78_exit);
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