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linux/drivers/hwmon/lm87.c
Thomas Gleixner 74ba9207e1 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 61 
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version this program is distributed in the
  hope that it will be useful but without any warranty without even
  the implied warranty of merchantability or fitness for a particular
  purpose see the gnu general public license for more details you
  should have received a copy of the gnu general public license along
  with this program if not write to the free software foundation inc
  675 mass ave cambridge ma 02139 usa

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 441 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190520071858.739733335@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-24 17:36:45 +02:00

1008 lines
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* lm87.c
*
* Copyright (C) 2000 Frodo Looijaard <frodol@dds.nl>
* Philip Edelbrock <phil@netroedge.com>
* Stephen Rousset <stephen.rousset@rocketlogix.com>
* Dan Eaton <dan.eaton@rocketlogix.com>
* Copyright (C) 2004-2008 Jean Delvare <jdelvare@suse.de>
*
* Original port to Linux 2.6 by Jeff Oliver.
*
* The LM87 is a sensor chip made by National Semiconductor. It monitors up
* to 8 voltages (including its own power source), up to three temperatures
* (its own plus up to two external ones) and up to two fans. The default
* configuration is 6 voltages, two temperatures and two fans (see below).
* Voltages are scaled internally with ratios such that the nominal value of
* each voltage correspond to a register value of 192 (which means a
* resolution of about 0.5% of the nominal value). Temperature values are
* reported with a 1 deg resolution and a 3-4 deg accuracy. Complete
* datasheet can be obtained from National's website at:
* http://www.national.com/pf/LM/LM87.html
*
* Some functions share pins, so not all functions are available at the same
* time. Which are depends on the hardware setup. This driver normally
* assumes that firmware configured the chip correctly. Where this is not
* the case, platform code must set the I2C client's platform_data to point
* to a u8 value to be written to the channel register.
* For reference, here is the list of exclusive functions:
* - in0+in5 (default) or temp3
* - fan1 (default) or in6
* - fan2 (default) or in7
* - VID lines (default) or IRQ lines (not handled by this driver)
*
* The LM87 additionally features an analog output, supposedly usable to
* control the speed of a fan. All new chips use pulse width modulation
* instead. The LM87 is the only hardware monitoring chipset I know of
* which uses amplitude modulation. Be careful when using this feature.
*
* This driver also supports the ADM1024, a sensor chip made by Analog
* Devices. That chip is fully compatible with the LM87. Complete
* datasheet can be obtained from Analog's website at:
* http://www.analog.com/en/prod/0,2877,ADM1024,00.html
*/
#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/hwmon-vid.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/regulator/consumer.h>
/*
* Addresses to scan
* LM87 has three possible addresses: 0x2c, 0x2d and 0x2e.
*/
static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
/*
* The LM87 registers
*/
/* nr in 0..5 */
#define LM87_REG_IN(nr) (0x20 + (nr))
#define LM87_REG_IN_MAX(nr) (0x2B + (nr) * 2)
#define LM87_REG_IN_MIN(nr) (0x2C + (nr) * 2)
/* nr in 0..1 */
#define LM87_REG_AIN(nr) (0x28 + (nr))
#define LM87_REG_AIN_MIN(nr) (0x1A + (nr))
#define LM87_REG_AIN_MAX(nr) (0x3B + (nr))
static u8 LM87_REG_TEMP[3] = { 0x27, 0x26, 0x20 };
static u8 LM87_REG_TEMP_HIGH[3] = { 0x39, 0x37, 0x2B };
static u8 LM87_REG_TEMP_LOW[3] = { 0x3A, 0x38, 0x2C };
#define LM87_REG_TEMP_HW_INT_LOCK 0x13
#define LM87_REG_TEMP_HW_EXT_LOCK 0x14
#define LM87_REG_TEMP_HW_INT 0x17
#define LM87_REG_TEMP_HW_EXT 0x18
/* nr in 0..1 */
#define LM87_REG_FAN(nr) (0x28 + (nr))
#define LM87_REG_FAN_MIN(nr) (0x3B + (nr))
#define LM87_REG_AOUT 0x19
#define LM87_REG_CONFIG 0x40
#define LM87_REG_CHANNEL_MODE 0x16
#define LM87_REG_VID_FAN_DIV 0x47
#define LM87_REG_VID4 0x49
#define LM87_REG_ALARMS1 0x41
#define LM87_REG_ALARMS2 0x42
#define LM87_REG_COMPANY_ID 0x3E
#define LM87_REG_REVISION 0x3F
/*
* Conversions and various macros
* The LM87 uses signed 8-bit values for temperatures.
*/
#define IN_FROM_REG(reg, scale) (((reg) * (scale) + 96) / 192)
#define IN_TO_REG(val, scale) ((val) <= 0 ? 0 : \
(val) >= (scale) * 255 / 192 ? 255 : \
((val) * 192 + (scale) / 2) / (scale))
#define TEMP_FROM_REG(reg) ((reg) * 1000)
#define TEMP_TO_REG(val) ((val) <= -127500 ? -128 : \
(val) >= 126500 ? 127 : \
(((val) < 0 ? (val) - 500 : \
(val) + 500) / 1000))
#define FAN_FROM_REG(reg, div) ((reg) == 255 || (reg) == 0 ? 0 : \
(1350000 + (reg)*(div) / 2) / ((reg) * (div)))
#define FAN_TO_REG(val, div) ((val) * (div) * 255 <= 1350000 ? 255 : \
(1350000 + (val)*(div) / 2) / ((val) * (div)))
#define FAN_DIV_FROM_REG(reg) (1 << (reg))
/* analog out is 9.80mV/LSB */
#define AOUT_FROM_REG(reg) (((reg) * 98 + 5) / 10)
#define AOUT_TO_REG(val) ((val) <= 0 ? 0 : \
(val) >= 2500 ? 255 : \
((val) * 10 + 49) / 98)
/* nr in 0..1 */
#define CHAN_NO_FAN(nr) (1 << (nr))
#define CHAN_TEMP3 (1 << 2)
#define CHAN_VCC_5V (1 << 3)
#define CHAN_NO_VID (1 << 7)
/*
* Client data (each client gets its own)
*/
struct lm87_data {
struct mutex update_lock;
char valid; /* zero until following fields are valid */
unsigned long last_updated; /* In jiffies */
u8 channel; /* register value */
u8 config; /* original register value */
u8 in[8]; /* register value */
u8 in_max[8]; /* register value */
u8 in_min[8]; /* register value */
u16 in_scale[8];
s8 temp[3]; /* register value */
s8 temp_high[3]; /* register value */
s8 temp_low[3]; /* register value */
s8 temp_crit_int; /* min of two register values */
s8 temp_crit_ext; /* min of two register values */
u8 fan[2]; /* register value */
u8 fan_min[2]; /* register value */
u8 fan_div[2]; /* register value, shifted right */
u8 aout; /* register value */
u16 alarms; /* register values, combined */
u8 vid; /* register values, combined */
u8 vrm;
const struct attribute_group *attr_groups[6];
};
static inline int lm87_read_value(struct i2c_client *client, u8 reg)
{
return i2c_smbus_read_byte_data(client, reg);
}
static inline int lm87_write_value(struct i2c_client *client, u8 reg, u8 value)
{
return i2c_smbus_write_byte_data(client, reg, value);
}
static struct lm87_data *lm87_update_device(struct device *dev)
{
struct i2c_client *client = dev_get_drvdata(dev);
struct lm87_data *data = i2c_get_clientdata(client);
mutex_lock(&data->update_lock);
if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
int i, j;
dev_dbg(&client->dev, "Updating data.\n");
i = (data->channel & CHAN_TEMP3) ? 1 : 0;
j = (data->channel & CHAN_TEMP3) ? 5 : 6;
for (; i < j; i++) {
data->in[i] = lm87_read_value(client,
LM87_REG_IN(i));
data->in_min[i] = lm87_read_value(client,
LM87_REG_IN_MIN(i));
data->in_max[i] = lm87_read_value(client,
LM87_REG_IN_MAX(i));
}
for (i = 0; i < 2; i++) {
if (data->channel & CHAN_NO_FAN(i)) {
data->in[6+i] = lm87_read_value(client,
LM87_REG_AIN(i));
data->in_max[6+i] = lm87_read_value(client,
LM87_REG_AIN_MAX(i));
data->in_min[6+i] = lm87_read_value(client,
LM87_REG_AIN_MIN(i));
} else {
data->fan[i] = lm87_read_value(client,
LM87_REG_FAN(i));
data->fan_min[i] = lm87_read_value(client,
LM87_REG_FAN_MIN(i));
}
}
j = (data->channel & CHAN_TEMP3) ? 3 : 2;
for (i = 0 ; i < j; i++) {
data->temp[i] = lm87_read_value(client,
LM87_REG_TEMP[i]);
data->temp_high[i] = lm87_read_value(client,
LM87_REG_TEMP_HIGH[i]);
data->temp_low[i] = lm87_read_value(client,
LM87_REG_TEMP_LOW[i]);
}
i = lm87_read_value(client, LM87_REG_TEMP_HW_INT_LOCK);
j = lm87_read_value(client, LM87_REG_TEMP_HW_INT);
data->temp_crit_int = min(i, j);
i = lm87_read_value(client, LM87_REG_TEMP_HW_EXT_LOCK);
j = lm87_read_value(client, LM87_REG_TEMP_HW_EXT);
data->temp_crit_ext = min(i, j);
i = lm87_read_value(client, LM87_REG_VID_FAN_DIV);
data->fan_div[0] = (i >> 4) & 0x03;
data->fan_div[1] = (i >> 6) & 0x03;
data->vid = (i & 0x0F)
| (lm87_read_value(client, LM87_REG_VID4) & 0x01)
<< 4;
data->alarms = lm87_read_value(client, LM87_REG_ALARMS1)
| (lm87_read_value(client, LM87_REG_ALARMS2)
<< 8);
data->aout = lm87_read_value(client, LM87_REG_AOUT);
data->last_updated = jiffies;
data->valid = 1;
}
mutex_unlock(&data->update_lock);
return data;
}
/*
* Sysfs stuff
*/
static ssize_t in_input_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct lm87_data *data = lm87_update_device(dev);
int nr = to_sensor_dev_attr(attr)->index;
return sprintf(buf, "%u\n", IN_FROM_REG(data->in[nr],
data->in_scale[nr]));
}
static ssize_t in_min_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct lm87_data *data = lm87_update_device(dev);
int nr = to_sensor_dev_attr(attr)->index;
return sprintf(buf, "%u\n", IN_FROM_REG(data->in_min[nr],
data->in_scale[nr]));
}
static ssize_t in_max_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct lm87_data *data = lm87_update_device(dev);
int nr = to_sensor_dev_attr(attr)->index;
return sprintf(buf, "%u\n", IN_FROM_REG(data->in_max[nr],
data->in_scale[nr]));
}
static ssize_t in_min_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct i2c_client *client = dev_get_drvdata(dev);
struct lm87_data *data = i2c_get_clientdata(client);
int nr = to_sensor_dev_attr(attr)->index;
long val;
int err;
err = kstrtol(buf, 10, &val);
if (err)
return err;
mutex_lock(&data->update_lock);
data->in_min[nr] = IN_TO_REG(val, data->in_scale[nr]);
lm87_write_value(client, nr < 6 ? LM87_REG_IN_MIN(nr) :
LM87_REG_AIN_MIN(nr - 6), data->in_min[nr]);
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t in_max_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct i2c_client *client = dev_get_drvdata(dev);
struct lm87_data *data = i2c_get_clientdata(client);
int nr = to_sensor_dev_attr(attr)->index;
long val;
int err;
err = kstrtol(buf, 10, &val);
if (err)
return err;
mutex_lock(&data->update_lock);
data->in_max[nr] = IN_TO_REG(val, data->in_scale[nr]);
lm87_write_value(client, nr < 6 ? LM87_REG_IN_MAX(nr) :
LM87_REG_AIN_MAX(nr - 6), data->in_max[nr]);
mutex_unlock(&data->update_lock);
return count;
}
static SENSOR_DEVICE_ATTR_RO(in0_input, in_input, 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_input, 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_input, 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_input, 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_input, 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_input, 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_input, 6);
static SENSOR_DEVICE_ATTR_RW(in6_min, in_min, 6);
static SENSOR_DEVICE_ATTR_RW(in6_max, in_max, 6);
static SENSOR_DEVICE_ATTR_RO(in7_input, in_input, 7);
static SENSOR_DEVICE_ATTR_RW(in7_min, in_min, 7);
static SENSOR_DEVICE_ATTR_RW(in7_max, in_max, 7);
static ssize_t temp_input_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct lm87_data *data = lm87_update_device(dev);
int nr = to_sensor_dev_attr(attr)->index;
return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
}
static ssize_t temp_low_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct lm87_data *data = lm87_update_device(dev);
int nr = to_sensor_dev_attr(attr)->index;
return sprintf(buf, "%d\n",
TEMP_FROM_REG(data->temp_low[nr]));
}
static ssize_t temp_high_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct lm87_data *data = lm87_update_device(dev);
int nr = to_sensor_dev_attr(attr)->index;
return sprintf(buf, "%d\n",
TEMP_FROM_REG(data->temp_high[nr]));
}
static ssize_t temp_low_store(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t count)
{
struct i2c_client *client = dev_get_drvdata(dev);
struct lm87_data *data = i2c_get_clientdata(client);
int nr = to_sensor_dev_attr(attr)->index;
long val;
int err;
err = kstrtol(buf, 10, &val);
if (err)
return err;
mutex_lock(&data->update_lock);
data->temp_low[nr] = TEMP_TO_REG(val);
lm87_write_value(client, LM87_REG_TEMP_LOW[nr], data->temp_low[nr]);
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t temp_high_store(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t count)
{
struct i2c_client *client = dev_get_drvdata(dev);
struct lm87_data *data = i2c_get_clientdata(client);
int nr = to_sensor_dev_attr(attr)->index;
long val;
int err;
err = kstrtol(buf, 10, &val);
if (err)
return err;
mutex_lock(&data->update_lock);
data->temp_high[nr] = TEMP_TO_REG(val);
lm87_write_value(client, LM87_REG_TEMP_HIGH[nr], data->temp_high[nr]);
mutex_unlock(&data->update_lock);
return count;
}
static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0);
static SENSOR_DEVICE_ATTR_RW(temp1_min, temp_low, 0);
static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_high, 0);
static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_input, 1);
static SENSOR_DEVICE_ATTR_RW(temp2_min, temp_low, 1);
static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_high, 1);
static SENSOR_DEVICE_ATTR_RO(temp3_input, temp_input, 2);
static SENSOR_DEVICE_ATTR_RW(temp3_min, temp_low, 2);
static SENSOR_DEVICE_ATTR_RW(temp3_max, temp_high, 2);
static ssize_t temp1_crit_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct lm87_data *data = lm87_update_device(dev);
return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_int));
}
static ssize_t temp2_crit_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct lm87_data *data = lm87_update_device(dev);
return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_ext));
}
static DEVICE_ATTR_RO(temp1_crit);
static DEVICE_ATTR_RO(temp2_crit);
static DEVICE_ATTR(temp3_crit, 0444, temp2_crit_show, NULL);
static ssize_t fan_input_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct lm87_data *data = lm87_update_device(dev);
int nr = to_sensor_dev_attr(attr)->index;
return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
FAN_DIV_FROM_REG(data->fan_div[nr])));
}
static ssize_t fan_min_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct lm87_data *data = lm87_update_device(dev);
int nr = to_sensor_dev_attr(attr)->index;
return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
FAN_DIV_FROM_REG(data->fan_div[nr])));
}
static ssize_t fan_div_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct lm87_data *data = lm87_update_device(dev);
int nr = to_sensor_dev_attr(attr)->index;
return sprintf(buf, "%d\n",
FAN_DIV_FROM_REG(data->fan_div[nr]));
}
static ssize_t fan_min_store(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t count)
{
struct i2c_client *client = dev_get_drvdata(dev);
struct lm87_data *data = i2c_get_clientdata(client);
int nr = to_sensor_dev_attr(attr)->index;
long val;
int err;
err = kstrtol(buf, 10, &val);
if (err)
return err;
mutex_lock(&data->update_lock);
data->fan_min[nr] = FAN_TO_REG(val,
FAN_DIV_FROM_REG(data->fan_div[nr]));
lm87_write_value(client, LM87_REG_FAN_MIN(nr), data->fan_min[nr]);
mutex_unlock(&data->update_lock);
return count;
}
/*
* Note: we save and restore the fan minimum here, because its value is
* determined in part by the fan clock divider. This follows the principle
* of least surprise; the user doesn't expect the fan minimum to change just
* because the divider changed.
*/
static ssize_t fan_div_store(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t count)
{
struct i2c_client *client = dev_get_drvdata(dev);
struct lm87_data *data = i2c_get_clientdata(client);
int nr = to_sensor_dev_attr(attr)->index;
long val;
int err;
unsigned long min;
u8 reg;
err = kstrtol(buf, 10, &val);
if (err)
return err;
mutex_lock(&data->update_lock);
min = FAN_FROM_REG(data->fan_min[nr],
FAN_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:
mutex_unlock(&data->update_lock);
return -EINVAL;
}
reg = lm87_read_value(client, LM87_REG_VID_FAN_DIV);
switch (nr) {
case 0:
reg = (reg & 0xCF) | (data->fan_div[0] << 4);
break;
case 1:
reg = (reg & 0x3F) | (data->fan_div[1] << 6);
break;
}
lm87_write_value(client, LM87_REG_VID_FAN_DIV, reg);
data->fan_min[nr] = FAN_TO_REG(min, val);
lm87_write_value(client, LM87_REG_FAN_MIN(nr),
data->fan_min[nr]);
mutex_unlock(&data->update_lock);
return count;
}
static SENSOR_DEVICE_ATTR_RO(fan1_input, fan_input, 0);
static SENSOR_DEVICE_ATTR_RW(fan1_min, fan_min, 0);
static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0);
static SENSOR_DEVICE_ATTR_RO(fan2_input, fan_input, 1);
static SENSOR_DEVICE_ATTR_RW(fan2_min, fan_min, 1);
static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1);
static ssize_t alarms_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct lm87_data *data = lm87_update_device(dev);
return sprintf(buf, "%d\n", data->alarms);
}
static DEVICE_ATTR_RO(alarms);
static ssize_t cpu0_vid_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct lm87_data *data = lm87_update_device(dev);
return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
}
static DEVICE_ATTR_RO(cpu0_vid);
static ssize_t vrm_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct lm87_data *data = dev_get_drvdata(dev);
return sprintf(buf, "%d\n", data->vrm);
}
static ssize_t vrm_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct lm87_data *data = dev_get_drvdata(dev);
unsigned long val;
int err;
err = kstrtoul(buf, 10, &val);
if (err)
return err;
if (val > 255)
return -EINVAL;
data->vrm = val;
return count;
}
static DEVICE_ATTR_RW(vrm);
static ssize_t aout_output_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct lm87_data *data = lm87_update_device(dev);
return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout));
}
static ssize_t aout_output_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct i2c_client *client = dev_get_drvdata(dev);
struct lm87_data *data = i2c_get_clientdata(client);
long val;
int err;
err = kstrtol(buf, 10, &val);
if (err)
return err;
mutex_lock(&data->update_lock);
data->aout = AOUT_TO_REG(val);
lm87_write_value(client, LM87_REG_AOUT, data->aout);
mutex_unlock(&data->update_lock);
return count;
}
static DEVICE_ATTR_RW(aout_output);
static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct lm87_data *data = lm87_update_device(dev);
int bitnr = to_sensor_dev_attr(attr)->index;
return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 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, 6);
static SENSOR_DEVICE_ATTR_RO(in7_alarm, alarm, 7);
static SENSOR_DEVICE_ATTR_RO(temp1_alarm, alarm, 4);
static SENSOR_DEVICE_ATTR_RO(temp2_alarm, alarm, 5);
static SENSOR_DEVICE_ATTR_RO(temp3_alarm, alarm, 5);
static SENSOR_DEVICE_ATTR_RO(fan1_alarm, alarm, 6);
static SENSOR_DEVICE_ATTR_RO(fan2_alarm, alarm, 7);
static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 14);
static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 15);
/*
* Real code
*/
static struct attribute *lm87_attributes[] = {
&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_temp1_input.dev_attr.attr,
&sensor_dev_attr_temp1_max.dev_attr.attr,
&sensor_dev_attr_temp1_min.dev_attr.attr,
&dev_attr_temp1_crit.attr,
&sensor_dev_attr_temp1_alarm.dev_attr.attr,
&sensor_dev_attr_temp2_input.dev_attr.attr,
&sensor_dev_attr_temp2_max.dev_attr.attr,
&sensor_dev_attr_temp2_min.dev_attr.attr,
&dev_attr_temp2_crit.attr,
&sensor_dev_attr_temp2_alarm.dev_attr.attr,
&sensor_dev_attr_temp2_fault.dev_attr.attr,
&dev_attr_alarms.attr,
&dev_attr_aout_output.attr,
NULL
};
static const struct attribute_group lm87_group = {
.attrs = lm87_attributes,
};
static struct attribute *lm87_attributes_in6[] = {
&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,
NULL
};
static const struct attribute_group lm87_group_in6 = {
.attrs = lm87_attributes_in6,
};
static struct attribute *lm87_attributes_fan1[] = {
&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,
NULL
};
static const struct attribute_group lm87_group_fan1 = {
.attrs = lm87_attributes_fan1,
};
static struct attribute *lm87_attributes_in7[] = {
&sensor_dev_attr_in7_input.dev_attr.attr,
&sensor_dev_attr_in7_min.dev_attr.attr,
&sensor_dev_attr_in7_max.dev_attr.attr,
&sensor_dev_attr_in7_alarm.dev_attr.attr,
NULL
};
static const struct attribute_group lm87_group_in7 = {
.attrs = lm87_attributes_in7,
};
static struct attribute *lm87_attributes_fan2[] = {
&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,
NULL
};
static const struct attribute_group lm87_group_fan2 = {
.attrs = lm87_attributes_fan2,
};
static struct attribute *lm87_attributes_temp3[] = {
&sensor_dev_attr_temp3_input.dev_attr.attr,
&sensor_dev_attr_temp3_max.dev_attr.attr,
&sensor_dev_attr_temp3_min.dev_attr.attr,
&dev_attr_temp3_crit.attr,
&sensor_dev_attr_temp3_alarm.dev_attr.attr,
&sensor_dev_attr_temp3_fault.dev_attr.attr,
NULL
};
static const struct attribute_group lm87_group_temp3 = {
.attrs = lm87_attributes_temp3,
};
static struct attribute *lm87_attributes_in0_5[] = {
&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_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,
NULL
};
static const struct attribute_group lm87_group_in0_5 = {
.attrs = lm87_attributes_in0_5,
};
static struct attribute *lm87_attributes_vid[] = {
&dev_attr_cpu0_vid.attr,
&dev_attr_vrm.attr,
NULL
};
static const struct attribute_group lm87_group_vid = {
.attrs = lm87_attributes_vid,
};
/* Return 0 if detection is successful, -ENODEV otherwise */
static int lm87_detect(struct i2c_client *client, struct i2c_board_info *info)
{
struct i2c_adapter *adapter = client->adapter;
const char *name;
u8 cid, rev;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -ENODEV;
if (lm87_read_value(client, LM87_REG_CONFIG) & 0x80)
return -ENODEV;
/* Now, we do the remaining detection. */
cid = lm87_read_value(client, LM87_REG_COMPANY_ID);
rev = lm87_read_value(client, LM87_REG_REVISION);
if (cid == 0x02 /* National Semiconductor */
&& (rev >= 0x01 && rev <= 0x08))
name = "lm87";
else if (cid == 0x41 /* Analog Devices */
&& (rev & 0xf0) == 0x10)
name = "adm1024";
else {
dev_dbg(&adapter->dev, "LM87 detection failed at 0x%02x\n",
client->addr);
return -ENODEV;
}
strlcpy(info->type, name, I2C_NAME_SIZE);
return 0;
}
static void lm87_restore_config(void *arg)
{
struct i2c_client *client = arg;
struct lm87_data *data = i2c_get_clientdata(client);
lm87_write_value(client, LM87_REG_CONFIG, data->config);
}
static int lm87_init_client(struct i2c_client *client)
{
struct lm87_data *data = i2c_get_clientdata(client);
int rc;
struct device_node *of_node = client->dev.of_node;
u8 val = 0;
struct regulator *vcc = NULL;
if (of_node) {
if (of_property_read_bool(of_node, "has-temp3"))
val |= CHAN_TEMP3;
if (of_property_read_bool(of_node, "has-in6"))
val |= CHAN_NO_FAN(0);
if (of_property_read_bool(of_node, "has-in7"))
val |= CHAN_NO_FAN(1);
vcc = devm_regulator_get_optional(&client->dev, "vcc");
if (!IS_ERR(vcc)) {
if (regulator_get_voltage(vcc) == 5000000)
val |= CHAN_VCC_5V;
}
data->channel = val;
lm87_write_value(client,
LM87_REG_CHANNEL_MODE, data->channel);
} else if (dev_get_platdata(&client->dev)) {
data->channel = *(u8 *)dev_get_platdata(&client->dev);
lm87_write_value(client,
LM87_REG_CHANNEL_MODE, data->channel);
} else {
data->channel = lm87_read_value(client, LM87_REG_CHANNEL_MODE);
}
data->config = lm87_read_value(client, LM87_REG_CONFIG) & 0x6F;
rc = devm_add_action(&client->dev, lm87_restore_config, client);
if (rc)
return rc;
if (!(data->config & 0x01)) {
int i;
/* Limits are left uninitialized after power-up */
for (i = 1; i < 6; i++) {
lm87_write_value(client, LM87_REG_IN_MIN(i), 0x00);
lm87_write_value(client, LM87_REG_IN_MAX(i), 0xFF);
}
for (i = 0; i < 2; i++) {
lm87_write_value(client, LM87_REG_TEMP_HIGH[i], 0x7F);
lm87_write_value(client, LM87_REG_TEMP_LOW[i], 0x00);
lm87_write_value(client, LM87_REG_AIN_MIN(i), 0x00);
lm87_write_value(client, LM87_REG_AIN_MAX(i), 0xFF);
}
if (data->channel & CHAN_TEMP3) {
lm87_write_value(client, LM87_REG_TEMP_HIGH[2], 0x7F);
lm87_write_value(client, LM87_REG_TEMP_LOW[2], 0x00);
} else {
lm87_write_value(client, LM87_REG_IN_MIN(0), 0x00);
lm87_write_value(client, LM87_REG_IN_MAX(0), 0xFF);
}
}
/* Make sure Start is set and INT#_Clear is clear */
if ((data->config & 0x09) != 0x01)
lm87_write_value(client, LM87_REG_CONFIG,
(data->config & 0x77) | 0x01);
return 0;
}
static int lm87_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
struct lm87_data *data;
struct device *hwmon_dev;
int err;
unsigned int group_tail = 0;
data = devm_kzalloc(&client->dev, sizeof(struct lm87_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
i2c_set_clientdata(client, data);
mutex_init(&data->update_lock);
/* Initialize the LM87 chip */
err = lm87_init_client(client);
if (err)
return err;
data->in_scale[0] = 2500;
data->in_scale[1] = 2700;
data->in_scale[2] = (data->channel & CHAN_VCC_5V) ? 5000 : 3300;
data->in_scale[3] = 5000;
data->in_scale[4] = 12000;
data->in_scale[5] = 2700;
data->in_scale[6] = 1875;
data->in_scale[7] = 1875;
/*
* Construct the list of attributes, the list depends on the
* configuration of the chip
*/
data->attr_groups[group_tail++] = &lm87_group;
if (data->channel & CHAN_NO_FAN(0))
data->attr_groups[group_tail++] = &lm87_group_in6;
else
data->attr_groups[group_tail++] = &lm87_group_fan1;
if (data->channel & CHAN_NO_FAN(1))
data->attr_groups[group_tail++] = &lm87_group_in7;
else
data->attr_groups[group_tail++] = &lm87_group_fan2;
if (data->channel & CHAN_TEMP3)
data->attr_groups[group_tail++] = &lm87_group_temp3;
else
data->attr_groups[group_tail++] = &lm87_group_in0_5;
if (!(data->channel & CHAN_NO_VID)) {
data->vrm = vid_which_vrm();
data->attr_groups[group_tail++] = &lm87_group_vid;
}
hwmon_dev = devm_hwmon_device_register_with_groups(
&client->dev, client->name, client, data->attr_groups);
return PTR_ERR_OR_ZERO(hwmon_dev);
}
/*
* Driver data (common to all clients)
*/
static const struct i2c_device_id lm87_id[] = {
{ "lm87", 0 },
{ "adm1024", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, lm87_id);
static const struct of_device_id lm87_of_match[] = {
{ .compatible = "ti,lm87" },
{ .compatible = "adi,adm1024" },
{ },
};
MODULE_DEVICE_TABLE(of, lm87_of_match);
static struct i2c_driver lm87_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "lm87",
.of_match_table = lm87_of_match,
},
.probe = lm87_probe,
.id_table = lm87_id,
.detect = lm87_detect,
.address_list = normal_i2c,
};
module_i2c_driver(lm87_driver);
MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de> and others");
MODULE_DESCRIPTION("LM87 driver");
MODULE_LICENSE("GPL");
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