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abituguru.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* abituguru.c Copyright (c) 2005-2006 Hans de Goede <hdegoede@redhat.com>
*/
/*
* This driver supports the sensor part of the first and second revision of
* the custom Abit uGuru chip found on Abit uGuru motherboards. Note: because
* of lack of specs the CPU/RAM voltage & frequency control is not supported!
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/mutex.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/dmi.h>
#include <linux/io.h>
/* Banks */
#define ABIT_UGURU_ALARM_BANK 0x20 /* 1x 3 bytes */
#define ABIT_UGURU_SENSOR_BANK1 0x21 /* 16x volt and temp */
#define ABIT_UGURU_FAN_PWM 0x24 /* 3x 5 bytes */
#define ABIT_UGURU_SENSOR_BANK2 0x26 /* fans */
/* max nr of sensors in bank1, a bank1 sensor can be in, temp or nc */
#define ABIT_UGURU_MAX_BANK1_SENSORS 16
/*
* Warning if you increase one of the 2 MAX defines below to 10 or higher you
* should adjust the belonging _NAMES_LENGTH macro for the 2 digit number!
*/
/* max nr of sensors in bank2, currently mb's with max 6 fans are known */
#define ABIT_UGURU_MAX_BANK2_SENSORS 6
/* max nr of pwm outputs, currently mb's with max 5 pwm outputs are known */
#define ABIT_UGURU_MAX_PWMS 5
/* uGuru sensor bank 1 flags */ /* Alarm if: */
#define ABIT_UGURU_TEMP_HIGH_ALARM_ENABLE 0x01 /* temp over warn */
#define ABIT_UGURU_VOLT_HIGH_ALARM_ENABLE 0x02 /* volt over max */
#define ABIT_UGURU_VOLT_LOW_ALARM_ENABLE 0x04 /* volt under min */
#define ABIT_UGURU_TEMP_HIGH_ALARM_FLAG 0x10 /* temp is over warn */
#define ABIT_UGURU_VOLT_HIGH_ALARM_FLAG 0x20 /* volt is over max */
#define ABIT_UGURU_VOLT_LOW_ALARM_FLAG 0x40 /* volt is under min */
/* uGuru sensor bank 2 flags */ /* Alarm if: */
#define ABIT_UGURU_FAN_LOW_ALARM_ENABLE 0x01 /* fan under min */
/* uGuru sensor bank common flags */
#define ABIT_UGURU_BEEP_ENABLE 0x08 /* beep if alarm */
#define ABIT_UGURU_SHUTDOWN_ENABLE 0x80 /* shutdown if alarm */
/* uGuru fan PWM (speed control) flags */
#define ABIT_UGURU_FAN_PWM_ENABLE 0x80 /* enable speed control */
/* Values used for conversion */
#define ABIT_UGURU_FAN_MAX 15300 /* RPM */
/* Bank1 sensor types */
#define ABIT_UGURU_IN_SENSOR 0
#define ABIT_UGURU_TEMP_SENSOR 1
#define ABIT_UGURU_NC 2
/*
* In many cases we need to wait for the uGuru to reach a certain status, most
* of the time it will reach this status within 30 - 90 ISA reads, and thus we
* can best busy wait. This define gives the total amount of reads to try.
*/
#define ABIT_UGURU_WAIT_TIMEOUT 125
/*
* However sometimes older versions of the uGuru seem to be distracted and they
* do not respond for a long time. To handle this we sleep before each of the
* last ABIT_UGURU_WAIT_TIMEOUT_SLEEP tries.
*/
#define ABIT_UGURU_WAIT_TIMEOUT_SLEEP 5
/*
* Normally all expected status in abituguru_ready, are reported after the
* first read, but sometimes not and we need to poll.
*/
#define ABIT_UGURU_READY_TIMEOUT 5
/* Maximum 3 retries on timedout reads/writes, delay 200 ms before retrying */
#define ABIT_UGURU_MAX_RETRIES 3
#define ABIT_UGURU_RETRY_DELAY (HZ/5)
/* Maximum 2 timeouts in abituguru_update_device, iow 3 in a row is an error */
#define ABIT_UGURU_MAX_TIMEOUTS 2
/* utility macros */
#define ABIT_UGURU_NAME "abituguru"
#define ABIT_UGURU_DEBUG(level, format, arg...) \
do { \
if (level <= verbose) \
pr_debug(format , ## arg); \
} while (0)
/* Macros to help calculate the sysfs_names array length */
/*
* sum of strlen of: in??_input\0, in??_{min,max}\0, in??_{min,max}_alarm\0,
* in??_{min,max}_alarm_enable\0, in??_beep\0, in??_shutdown\0
*/
#define ABITUGURU_IN_NAMES_LENGTH (11 + 2 * 9 + 2 * 15 + 2 * 22 + 10 + 14)
/*
* sum of strlen of: temp??_input\0, temp??_max\0, temp??_crit\0,
* temp??_alarm\0, temp??_alarm_enable\0, temp??_beep\0, temp??_shutdown\0
*/
#define ABITUGURU_TEMP_NAMES_LENGTH (13 + 11 + 12 + 13 + 20 + 12 + 16)
/*
* sum of strlen of: fan?_input\0, fan?_min\0, fan?_alarm\0,
* fan?_alarm_enable\0, fan?_beep\0, fan?_shutdown\0
*/
#define ABITUGURU_FAN_NAMES_LENGTH (11 + 9 + 11 + 18 + 10 + 14)
/*
* sum of strlen of: pwm?_enable\0, pwm?_auto_channels_temp\0,
* pwm?_auto_point{1,2}_pwm\0, pwm?_auto_point{1,2}_temp\0
*/
#define ABITUGURU_PWM_NAMES_LENGTH (12 + 24 + 2 * 21 + 2 * 22)
/* IN_NAMES_LENGTH > TEMP_NAMES_LENGTH so assume all bank1 sensors are in */
#define ABITUGURU_SYSFS_NAMES_LENGTH ( \
ABIT_UGURU_MAX_BANK1_SENSORS * ABITUGURU_IN_NAMES_LENGTH + \
ABIT_UGURU_MAX_BANK2_SENSORS * ABITUGURU_FAN_NAMES_LENGTH + \
ABIT_UGURU_MAX_PWMS * ABITUGURU_PWM_NAMES_LENGTH)
/*
* All the macros below are named identical to the oguru and oguru2 programs
* reverse engineered by Olle Sandberg, hence the names might not be 100%
* logical. I could come up with better names, but I prefer keeping the names
* identical so that this driver can be compared with his work more easily.
*/
/* Two i/o-ports are used by uGuru */
#define ABIT_UGURU_BASE 0x00E0
/* Used to tell uGuru what to read and to read the actual data */
#define ABIT_UGURU_CMD 0x00
/* Mostly used to check if uGuru is busy */
#define ABIT_UGURU_DATA 0x04
#define ABIT_UGURU_REGION_LENGTH 5
/* uGuru status' */
#define ABIT_UGURU_STATUS_WRITE 0x00 /* Ready to be written */
#define ABIT_UGURU_STATUS_READ 0x01 /* Ready to be read */
#define ABIT_UGURU_STATUS_INPUT 0x08 /* More input */
#define ABIT_UGURU_STATUS_READY 0x09 /* Ready to be written */
/* Constants */
/* in (Volt) sensors go up to 3494 mV, temp to 255000 millidegrees Celsius */
static const int abituguru_bank1_max_value[2] = { 3494, 255000 };
/*
* Min / Max allowed values for sensor2 (fan) alarm threshold, these values
* correspond to 300-3000 RPM
*/
static const u8 abituguru_bank2_min_threshold = 5;
static const u8 abituguru_bank2_max_threshold = 50;
/*
* Register 0 is a bitfield, 1 and 2 are pwm settings (255 = 100%), 3 and 4
* are temperature trip points.
*/
static const int abituguru_pwm_settings_multiplier[5] = { 0, 1, 1, 1000, 1000 };
/*
* Min / Max allowed values for pwm_settings. Note: pwm1 (CPU fan) is a
* special case the minimum allowed pwm% setting for this is 30% (77) on
* some MB's this special case is handled in the code!
*/
static const u8 abituguru_pwm_min[5] = { 0, 170, 170, 25, 25 };
static const u8 abituguru_pwm_max[5] = { 0, 255, 255, 75, 75 };
/* Insmod parameters */
static bool force;
module_param(force, bool, 0);
MODULE_PARM_DESC(force, "Set to one to force detection.");
static int bank1_types[ABIT_UGURU_MAX_BANK1_SENSORS] = { -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 };
module_param_array(bank1_types, int, NULL, 0);
MODULE_PARM_DESC(bank1_types, "Bank1 sensortype autodetection override:\n"
" -1 autodetect\n"
" 0 volt sensor\n"
" 1 temp sensor\n"
" 2 not connected");
static int fan_sensors;
module_param(fan_sensors, int, 0);
MODULE_PARM_DESC(fan_sensors, "Number of fan sensors on the uGuru "
"(0 = autodetect)");
static int pwms;
module_param(pwms, int, 0);
MODULE_PARM_DESC(pwms, "Number of PWMs on the uGuru "
"(0 = autodetect)");
/* Default verbose is 2, since this driver is still in the testing phase */
static int verbose = 2;
module_param(verbose, int, 0644);
MODULE_PARM_DESC(verbose, "How verbose should the driver be? (0-3):\n"
" 0 normal output\n"
" 1 + verbose error reporting\n"
" 2 + sensors type probing info\n"
" 3 + retryable error reporting");
/*
* For the Abit uGuru, we need to keep some data in memory.
* The structure is dynamically allocated, at the same time when a new
* abituguru device is allocated.
*/
struct abituguru_data {
struct device *hwmon_dev; /* hwmon registered device */
struct mutex update_lock; /* protect access to data and uGuru */
unsigned long last_updated; /* In jiffies */
unsigned short addr; /* uguru base address */
char uguru_ready; /* is the uguru in ready state? */
unsigned char update_timeouts; /*
* number of update timeouts since last
* successful update
*/
/*
* The sysfs attr and their names are generated automatically, for bank1
* we cannot use a predefined array because we don't know beforehand
* of a sensor is a volt or a temp sensor, for bank2 and the pwms its
* easier todo things the same way. For in sensors we have 9 (temp 7)
* sysfs entries per sensor, for bank2 and pwms 6.
*/
struct sensor_device_attribute_2 sysfs_attr[
ABIT_UGURU_MAX_BANK1_SENSORS * 9 +
ABIT_UGURU_MAX_BANK2_SENSORS * 6 + ABIT_UGURU_MAX_PWMS * 6];
/* Buffer to store the dynamically generated sysfs names */
char sysfs_names[ABITUGURU_SYSFS_NAMES_LENGTH];
/* Bank 1 data */
/* number of and addresses of [0] in, [1] temp sensors */
u8 bank1_sensors[2];
u8 bank1_address[2][ABIT_UGURU_MAX_BANK1_SENSORS];
u8 bank1_value[ABIT_UGURU_MAX_BANK1_SENSORS];
/*
* This array holds 3 entries per sensor for the bank 1 sensor settings
* (flags, min, max for voltage / flags, warn, shutdown for temp).
*/
u8 bank1_settings[ABIT_UGURU_MAX_BANK1_SENSORS][3];
/*
* Maximum value for each sensor used for scaling in mV/millidegrees
* Celsius.
*/
int bank1_max_value[ABIT_UGURU_MAX_BANK1_SENSORS];
/* Bank 2 data, ABIT_UGURU_MAX_BANK2_SENSORS entries for bank2 */
u8 bank2_sensors; /* actual number of bank2 sensors found */
u8 bank2_value[ABIT_UGURU_MAX_BANK2_SENSORS];
u8 bank2_settings[ABIT_UGURU_MAX_BANK2_SENSORS][2]; /* flags, min */
/* Alarms 2 bytes for bank1, 1 byte for bank2 */
u8 alarms[3];
/* Fan PWM (speed control) 5 bytes per PWM */
u8 pwms; /* actual number of pwms found */
u8 pwm_settings[ABIT_UGURU_MAX_PWMS][5];
};
static const char *never_happen = "This should never happen.";
static const char *report_this =
"Please report this to the abituguru maintainer (see MAINTAINERS)";
/* wait till the uguru is in the specified state */
static int abituguru_wait(struct abituguru_data *data, u8 state)
{
int timeout = ABIT_UGURU_WAIT_TIMEOUT;
while (inb_p(data->addr + ABIT_UGURU_DATA) != state) {
timeout--;
if (timeout == 0)
return -EBUSY;
/*
* sleep a bit before our last few tries, see the comment on
* this where ABIT_UGURU_WAIT_TIMEOUT_SLEEP is defined.
*/
if (timeout <= ABIT_UGURU_WAIT_TIMEOUT_SLEEP)
msleep(0);
}
return 0;
}
/* Put the uguru in ready for input state */
static int abituguru_ready(struct abituguru_data *data)
{
int timeout = ABIT_UGURU_READY_TIMEOUT;
if (data->uguru_ready)
return 0;
/* Reset? / Prepare for next read/write cycle */
outb(0x00, data->addr + ABIT_UGURU_DATA);
/* Wait till the uguru is ready */
if (abituguru_wait(data, ABIT_UGURU_STATUS_READY)) {
ABIT_UGURU_DEBUG(1,
"timeout exceeded waiting for ready state\n");
return -EIO;
}
/* Cmd port MUST be read now and should contain 0xAC */
while (inb_p(data->addr + ABIT_UGURU_CMD) != 0xAC) {
timeout--;
if (timeout == 0) {
ABIT_UGURU_DEBUG(1,
"CMD reg does not hold 0xAC after ready command\n");
return -EIO;
}
msleep(0);
}
/*
* After this the ABIT_UGURU_DATA port should contain
* ABIT_UGURU_STATUS_INPUT
*/
timeout = ABIT_UGURU_READY_TIMEOUT;
while (inb_p(data->addr + ABIT_UGURU_DATA) != ABIT_UGURU_STATUS_INPUT) {
timeout--;
if (timeout == 0) {
ABIT_UGURU_DEBUG(1,
"state != more input after ready command\n");
return -EIO;
}
msleep(0);
}
data->uguru_ready = 1;
return 0;
}
/*
* Send the bank and then sensor address to the uGuru for the next read/write
* cycle. This function gets called as the first part of a read/write by
* abituguru_read and abituguru_write. This function should never be
* called by any other function.
*/
static int abituguru_send_address(struct abituguru_data *data,
u8 bank_addr, u8 sensor_addr, int retries)
{
/*
* assume the caller does error handling itself if it has not requested
* any retries, and thus be quiet.
*/
int report_errors = retries;
for (;;) {
/*
* Make sure the uguru is ready and then send the bank address,
* after this the uguru is no longer "ready".
*/
if (abituguru_ready(data) != 0)
return -EIO;
outb(bank_addr, data->addr + ABIT_UGURU_DATA);
data->uguru_ready = 0;
/*
* Wait till the uguru is ABIT_UGURU_STATUS_INPUT state again
* and send the sensor addr
*/
if (abituguru_wait(data, ABIT_UGURU_STATUS_INPUT)) {
if (retries) {
ABIT_UGURU_DEBUG(3, "timeout exceeded "
"waiting for more input state, %d "
"tries remaining\n", retries);
set_current_state(TASK_UNINTERRUPTIBLE);
schedule_timeout(ABIT_UGURU_RETRY_DELAY);
retries--;
continue;
}
if (report_errors)
ABIT_UGURU_DEBUG(1, "timeout exceeded "
"waiting for more input state "
"(bank: %d)\n", (int)bank_addr);
return -EBUSY;
}
outb(sensor_addr, data->addr + ABIT_UGURU_CMD);
return 0;
}
}
/*
* Read count bytes from sensor sensor_addr in bank bank_addr and store the
* result in buf, retry the send address part of the read retries times.
*/
static int abituguru_read(struct abituguru_data *data,
u8 bank_addr, u8 sensor_addr, u8 *buf, int count, int retries)
{
int i;
/* Send the address */
i = abituguru_send_address(data, bank_addr, sensor_addr, retries);
if (i)
return i;
/* And read the data */
for (i = 0; i < count; i++) {
if (abituguru_wait(data, ABIT_UGURU_STATUS_READ)) {
ABIT_UGURU_DEBUG(retries ? 1 : 3,
"timeout exceeded waiting for "
"read state (bank: %d, sensor: %d)\n",
(int)bank_addr, (int)sensor_addr);
break;
}
buf[i] = inb(data->addr + ABIT_UGURU_CMD);
}
/* Last put the chip back in ready state */
abituguru_ready(data);
return i;
}
/*
* Write count bytes from buf to sensor sensor_addr in bank bank_addr, the send
* address part of the write is always retried ABIT_UGURU_MAX_RETRIES times.
*/
static int abituguru_write(struct abituguru_data *data,
u8 bank_addr, u8 sensor_addr, u8 *buf, int count)
{
/*
* We use the ready timeout as we have to wait for 0xAC just like the
* ready function
*/
int i, timeout = ABIT_UGURU_READY_TIMEOUT;
/* Send the address */
i = abituguru_send_address(data, bank_addr, sensor_addr,
ABIT_UGURU_MAX_RETRIES);
if (i)
return i;
/* And write the data */
for (i = 0; i < count; i++) {
if (abituguru_wait(data, ABIT_UGURU_STATUS_WRITE)) {
ABIT_UGURU_DEBUG(1, "timeout exceeded waiting for "
"write state (bank: %d, sensor: %d)\n",
(int)bank_addr, (int)sensor_addr);
break;
}
outb(buf[i], data->addr + ABIT_UGURU_CMD);
}
/*
* Now we need to wait till the chip is ready to be read again,
* so that we can read 0xAC as confirmation that our write has
* succeeded.
*/
if (abituguru_wait(data, ABIT_UGURU_STATUS_READ)) {
ABIT_UGURU_DEBUG(1, "timeout exceeded waiting for read state "
"after write (bank: %d, sensor: %d)\n", (int)bank_addr,
(int)sensor_addr);
return -EIO;
}
/* Cmd port MUST be read now and should contain 0xAC */
while (inb_p(data->addr + ABIT_UGURU_CMD) != 0xAC) {
timeout--;
if (timeout == 0) {
ABIT_UGURU_DEBUG(1, "CMD reg does not hold 0xAC after "
"write (bank: %d, sensor: %d)\n",
(int)bank_addr, (int)sensor_addr);
return -EIO;
}
msleep(0);
}
/* Last put the chip back in ready state */
abituguru_ready(data);
return i;
}
/*
* Detect sensor type. Temp and Volt sensors are enabled with
* different masks and will ignore enable masks not meant for them.
* This enables us to test what kind of sensor we're dealing with.
* By setting the alarm thresholds so that we will always get an
* alarm for sensor type X and then enabling the sensor as sensor type
* X, if we then get an alarm it is a sensor of type X.
*/
static int
abituguru_detect_bank1_sensor_type(struct abituguru_data *data,
u8 sensor_addr)
{
u8 val, test_flag, buf[3];
int i, ret = -ENODEV; /* error is the most common used retval :| */
/* If overriden by the user return the user selected type */
if (bank1_types[sensor_addr] >= ABIT_UGURU_IN_SENSOR &&
bank1_types[sensor_addr] <= ABIT_UGURU_NC) {
ABIT_UGURU_DEBUG(2, "assuming sensor type %d for bank1 sensor "
"%d because of \"bank1_types\" module param\n",
bank1_types[sensor_addr], (int)sensor_addr);
return bank1_types[sensor_addr];
}
/* First read the sensor and the current settings */
if (abituguru_read(data, ABIT_UGURU_SENSOR_BANK1, sensor_addr, &val,
1, ABIT_UGURU_MAX_RETRIES) != 1)
return -ENODEV;
/* Test val is sane / usable for sensor type detection. */
if ((val < 10u) || (val > 250u)) {
pr_warn("bank1-sensor: %d reading (%d) too close to limits, "
"unable to determine sensor type, skipping sensor\n",
(int)sensor_addr, (int)val);
/*
* assume no sensor is there for sensors for which we can't
* determine the sensor type because their reading is too close
* to their limits, this usually means no sensor is there.
*/
return ABIT_UGURU_NC;
}
ABIT_UGURU_DEBUG(2, "testing bank1 sensor %d\n", (int)sensor_addr);
/*
* Volt sensor test, enable volt low alarm, set min value ridiculously
* high, or vica versa if the reading is very high. If its a volt
* sensor this should always give us an alarm.
*/
if (val <= 240u) {
buf[0] = ABIT_UGURU_VOLT_LOW_ALARM_ENABLE;
buf[1] = 245;
buf[2] = 250;
test_flag = ABIT_UGURU_VOLT_LOW_ALARM_FLAG;
} else {
buf[0] = ABIT_UGURU_VOLT_HIGH_ALARM_ENABLE;
buf[1] = 5;
buf[2] = 10;
test_flag = ABIT_UGURU_VOLT_HIGH_ALARM_FLAG;
}
if (abituguru_write(data, ABIT_UGURU_SENSOR_BANK1 + 2, sensor_addr,
buf, 3) != 3)
goto abituguru_detect_bank1_sensor_type_exit;
/*
* Now we need 20 ms to give the uguru time to read the sensors
* and raise a voltage alarm
*/
set_current_state(TASK_UNINTERRUPTIBLE);
schedule_timeout(HZ/50);
/* Check for alarm and check the alarm is a volt low alarm. */
if (abituguru_read(data, ABIT_UGURU_ALARM_BANK, 0, buf, 3,
ABIT_UGURU_MAX_RETRIES) != 3)
goto abituguru_detect_bank1_sensor_type_exit;
if (buf[sensor_addr/8] & (0x01 << (sensor_addr % 8))) {
if (abituguru_read(data, ABIT_UGURU_SENSOR_BANK1 + 1,
sensor_addr, buf, 3,
ABIT_UGURU_MAX_RETRIES) != 3)
goto abituguru_detect_bank1_sensor_type_exit;
if (buf[0] & test_flag) {
ABIT_UGURU_DEBUG(2, " found volt sensor\n");
ret = ABIT_UGURU_IN_SENSOR;
goto abituguru_detect_bank1_sensor_type_exit;
} else
ABIT_UGURU_DEBUG(2, " alarm raised during volt "
"sensor test, but volt range flag not set\n");
} else
ABIT_UGURU_DEBUG(2, " alarm not raised during volt sensor "
"test\n");
/*
* Temp sensor test, enable sensor as a temp sensor, set beep value
* ridiculously low (but not too low, otherwise uguru ignores it).
* If its a temp sensor this should always give us an alarm.
*/
buf[0] = ABIT_UGURU_TEMP_HIGH_ALARM_ENABLE;
buf[1] = 5;
buf[2] = 10;
if (abituguru_write(data, ABIT_UGURU_SENSOR_BANK1 + 2, sensor_addr,
buf, 3) != 3)
goto abituguru_detect_bank1_sensor_type_exit;
/*
* Now we need 50 ms to give the uguru time to read the sensors
* and raise a temp alarm
*/
set_current_state(TASK_UNINTERRUPTIBLE);
schedule_timeout(HZ/20);
/* Check for alarm and check the alarm is a temp high alarm. */
if (abituguru_read(data, ABIT_UGURU_ALARM_BANK, 0, buf, 3,
ABIT_UGURU_MAX_RETRIES) != 3)
goto abituguru_detect_bank1_sensor_type_exit;
if (buf[sensor_addr/8] & (0x01 << (sensor_addr % 8))) {
if (abituguru_read(data, ABIT_UGURU_SENSOR_BANK1 + 1,
sensor_addr, buf, 3,
ABIT_UGURU_MAX_RETRIES) != 3)
goto abituguru_detect_bank1_sensor_type_exit;
if (buf[0] & ABIT_UGURU_TEMP_HIGH_ALARM_FLAG) {
ABIT_UGURU_DEBUG(2, " found temp sensor\n");
ret = ABIT_UGURU_TEMP_SENSOR;
goto abituguru_detect_bank1_sensor_type_exit;
} else
ABIT_UGURU_DEBUG(2, " alarm raised during temp "
"sensor test, but temp high flag not set\n");
} else
ABIT_UGURU_DEBUG(2, " alarm not raised during temp sensor "
"test\n");
ret = ABIT_UGURU_NC;
abituguru_detect_bank1_sensor_type_exit:
/*
* Restore original settings, failing here is really BAD, it has been
* reported that some BIOS-es hang when entering the uGuru menu with
* invalid settings present in the uGuru, so we try this 3 times.
*/
for (i = 0; i < 3; i++)
if (abituguru_write(data, ABIT_UGURU_SENSOR_BANK1 + 2,
sensor_addr, data->bank1_settings[sensor_addr],
3) == 3)
break;
if (i == 3) {
pr_err("Fatal error could not restore original settings. %s %s\n",
never_happen, report_this);
return -ENODEV;
}
return ret;
}
/*
* These functions try to find out how many sensors there are in bank2 and how
* many pwms there are. The purpose of this is to make sure that we don't give
* the user the possibility to change settings for non-existent sensors / pwm.
* The uGuru will happily read / write whatever memory happens to be after the
* memory storing the PWM settings when reading/writing to a PWM which is not
* there. Notice even if we detect a PWM which doesn't exist we normally won't
* write to it, unless the user tries to change the settings.
*
* Although the uGuru allows reading (settings) from non existing bank2
* sensors, my version of the uGuru does seem to stop writing to them, the
* write function above aborts in this case with:
* "CMD reg does not hold 0xAC after write"
*
* Notice these 2 tests are non destructive iow read-only tests, otherwise
* they would defeat their purpose. Although for the bank2_sensors detection a
* read/write test would be feasible because of the reaction above, I've
* however opted to stay on the safe side.
*/
static void
abituguru_detect_no_bank2_sensors(struct abituguru_data *data)
{
int i;
if (fan_sensors > 0 && fan_sensors <= ABIT_UGURU_MAX_BANK2_SENSORS) {
data->bank2_sensors = fan_sensors;
ABIT_UGURU_DEBUG(2, "assuming %d fan sensors because of "
"\"fan_sensors\" module param\n",
(int)data->bank2_sensors);
return;
}
ABIT_UGURU_DEBUG(2, "detecting number of fan sensors\n");
for (i = 0; i < ABIT_UGURU_MAX_BANK2_SENSORS; i++) {
/*
* 0x89 are the known used bits:
* -0x80 enable shutdown
* -0x08 enable beep
* -0x01 enable alarm
* All other bits should be 0, but on some motherboards
* 0x40 (bit 6) is also high for some of the fans??
*/
if (data->bank2_settings[i][0] & ~0xC9) {
ABIT_UGURU_DEBUG(2, " bank2 sensor %d does not seem "
"to be a fan sensor: settings[0] = %02X\n",
i, (unsigned int)data->bank2_settings[i][0]);
break;
}
/* check if the threshold is within the allowed range */
if (data->bank2_settings[i][1] <
abituguru_bank2_min_threshold) {
ABIT_UGURU_DEBUG(2, " bank2 sensor %d does not seem "
"to be a fan sensor: the threshold (%d) is "
"below the minimum (%d)\n", i,
(int)data->bank2_settings[i][1],
(int)abituguru_bank2_min_threshold);
break;
}
if (data->bank2_settings[i][1] >
abituguru_bank2_max_threshold) {
ABIT_UGURU_DEBUG(2, " bank2 sensor %d does not seem "
"to be a fan sensor: the threshold (%d) is "
"above the maximum (%d)\n", i,
(int)data->bank2_settings[i][1],
(int)abituguru_bank2_max_threshold);
break;
}
}
data->bank2_sensors = i;
ABIT_UGURU_DEBUG(2, " found: %d fan sensors\n",
(int)data->bank2_sensors);
}
static void
abituguru_detect_no_pwms(struct abituguru_data *data)
{
int i, j;
if (pwms > 0 && pwms <= ABIT_UGURU_MAX_PWMS) {
data->pwms = pwms;
ABIT_UGURU_DEBUG(2, "assuming %d PWM outputs because of "
"\"pwms\" module param\n", (int)data->pwms);
return;
}
ABIT_UGURU_DEBUG(2, "detecting number of PWM outputs\n");
for (i = 0; i < ABIT_UGURU_MAX_PWMS; i++) {
/*
* 0x80 is the enable bit and the low
* nibble is which temp sensor to use,
* the other bits should be 0
*/
if (data->pwm_settings[i][0] & ~0x8F) {
ABIT_UGURU_DEBUG(2, " pwm channel %d does not seem "
"to be a pwm channel: settings[0] = %02X\n",
i, (unsigned int)data->pwm_settings[i][0]);
break;
}
/*
* the low nibble must correspond to one of the temp sensors
* we've found
*/
for (j = 0; j < data->bank1_sensors[ABIT_UGURU_TEMP_SENSOR];
j++) {
if (data->bank1_address[ABIT_UGURU_TEMP_SENSOR][j] ==
(data->pwm_settings[i][0] & 0x0F))
break;
}
if (j == data->bank1_sensors[ABIT_UGURU_TEMP_SENSOR]) {
ABIT_UGURU_DEBUG(2, " pwm channel %d does not seem "
"to be a pwm channel: %d is not a valid temp "
"sensor address\n", i,
data->pwm_settings[i][0] & 0x0F);
break;
}
/* check if all other settings are within the allowed range */
for (j = 1; j < 5; j++) {
u8 min;
/* special case pwm1 min pwm% */
if ((i == 0) && ((j == 1) || (j == 2)))
min = 77;
else
min = abituguru_pwm_min[j];
if (data->pwm_settings[i][j] < min) {
ABIT_UGURU_DEBUG(2, " pwm channel %d does "
"not seem to be a pwm channel: "
"setting %d (%d) is below the minimum "
"value (%d)\n", i, j,
(int)data->pwm_settings[i][j],
(int)min);
goto abituguru_detect_no_pwms_exit;
}
if (data->pwm_settings[i][j] > abituguru_pwm_max[j]) {
ABIT_UGURU_DEBUG(2, " pwm channel %d does "
"not seem to be a pwm channel: "
"setting %d (%d) is above the maximum "
"value (%d)\n", i, j,
(int)data->pwm_settings[i][j],
(int)abituguru_pwm_max[j]);
goto abituguru_detect_no_pwms_exit;
}
}
/* check that min temp < max temp and min pwm < max pwm */
if (data->pwm_settings[i][1] >= data->pwm_settings[i][2]) {
ABIT_UGURU_DEBUG(2, " pwm channel %d does not seem "
"to be a pwm channel: min pwm (%d) >= "
"max pwm (%d)\n", i,
(int)data->pwm_settings[i][1],
(int)data->pwm_settings[i][2]);
break;
}
if (data->pwm_settings[i][3] >= data->pwm_settings[i][4]) {
ABIT_UGURU_DEBUG(2, " pwm channel %d does not seem "
"to be a pwm channel: min temp (%d) >= "
"max temp (%d)\n", i,
(int)data->pwm_settings[i][3],
(int)data->pwm_settings[i][4]);
break;
}
}
abituguru_detect_no_pwms_exit:
data->pwms = i;
ABIT_UGURU_DEBUG(2, " found: %d PWM outputs\n", (int)data->pwms);
}
/*
* Following are the sysfs callback functions. These functions expect:
* sensor_device_attribute_2->index: sensor address/offset in the bank
* sensor_device_attribute_2->nr: register offset, bitmask or NA.
*/
static struct abituguru_data *abituguru_update_device(struct device *dev);
static ssize_t show_bank1_value(struct device *dev,
struct device_attribute *devattr, char *buf)
{
struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr);
struct abituguru_data *data = abituguru_update_device(dev);
if (!data)
return -EIO;
return sprintf(buf, "%d\n", (data->bank1_value[attr->index] *
data->bank1_max_value[attr->index] + 128) / 255);
}
static ssize_t show_bank1_setting(struct device *dev,
struct device_attribute *devattr, char *buf)
{
struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr);
struct abituguru_data *data = dev_get_drvdata(dev);
return sprintf(buf, "%d\n",
(data->bank1_settings[attr->index][attr->nr] *
data->bank1_max_value[attr->index] + 128) / 255);
}
static ssize_t show_bank2_value(struct device *dev,
struct device_attribute *devattr, char *buf)
{
struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr);
struct abituguru_data *data = abituguru_update_device(dev);
if (!data)
return -EIO;
return sprintf(buf, "%d\n", (data->bank2_value[attr->index] *
ABIT_UGURU_FAN_MAX + 128) / 255);
}
static ssize_t show_bank2_setting(struct device *dev,
struct device_attribute *devattr, char *buf)
{
struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr);
struct abituguru_data *data = dev_get_drvdata(dev);
return sprintf(buf, "%d\n",
(data->bank2_settings[attr->index][attr->nr] *
ABIT_UGURU_FAN_MAX + 128) / 255);
}
static ssize_t store_bank1_setting(struct device *dev, struct device_attribute
*devattr, const char *buf, size_t count)
{
struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr);
struct abituguru_data *data = dev_get_drvdata(dev);
unsigned long val;
ssize_t ret;
ret = kstrtoul(buf, 10, &val);
if (ret)
return ret;
ret = count;
val = (val * 255 + data->bank1_max_value[attr->index] / 2) /
data->bank1_max_value[attr->index];
if (val > 255)
return -EINVAL;
mutex_lock(&data->update_lock);
if (data->bank1_settings[attr->index][attr->nr] != val) {
u8 orig_val = data->bank1_settings[attr->index][attr->nr];
data->bank1_settings[attr->index][attr->nr] = val;
if (abituguru_write(data, ABIT_UGURU_SENSOR_BANK1 + 2,
attr->index, data->bank1_settings[attr->index],
3) <= attr->nr) {
data->bank1_settings[attr->index][attr->nr] = orig_val;
ret = -EIO;
}
}
mutex_unlock(&data->update_lock);
return ret;
}
static ssize_t store_bank2_setting(struct device *dev, struct device_attribute
*devattr, const char *buf, size_t count)
{
struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr);
struct abituguru_data *data = dev_get_drvdata(dev);
unsigned long val;
ssize_t ret;
ret = kstrtoul(buf, 10, &val);
if (ret)
return ret;
ret = count;
val = (val * 255 + ABIT_UGURU_FAN_MAX / 2) / ABIT_UGURU_FAN_MAX;
/* this check can be done before taking the lock */
if (val < abituguru_bank2_min_threshold ||
val > abituguru_bank2_max_threshold)
return -EINVAL;
mutex_lock(&data->update_lock);
if (data->bank2_settings[attr->index][attr->nr] != val) {
u8 orig_val = data->bank2_settings[attr->index][attr->nr];
data->bank2_settings[attr->index][attr->nr] = val;
if (abituguru_write(data, ABIT_UGURU_SENSOR_BANK2 + 2,
attr->index, data->bank2_settings[attr->index],
2) <= attr->nr) {
data->bank2_settings[attr->index][attr->nr] = orig_val;
ret = -EIO;
}
}
mutex_unlock(&data->update_lock);
return ret;
}
static ssize_t show_bank1_alarm(struct device *dev,
struct device_attribute *devattr, char *buf)
{
struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr);
struct abituguru_data *data = abituguru_update_device(dev);
if (!data)
return -EIO;
/*
* See if the alarm bit for this sensor is set, and if the
* alarm matches the type of alarm we're looking for (for volt
* it can be either low or high). The type is stored in a few
* readonly bits in the settings part of the relevant sensor.
* The bitmask of the type is passed to us in attr->nr.
*/
if ((data->alarms[attr->index / 8] & (0x01 << (attr->index % 8))) &&
(data->bank1_settings[attr->index][0] & attr->nr))
return sprintf(buf, "1\n");
else
return sprintf(buf, "0\n");
}
static ssize_t show_bank2_alarm(struct device *dev,
struct device_attribute *devattr, char *buf)
{
struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr);
struct abituguru_data *data = abituguru_update_device(dev);
if (!data)
return -EIO;
if (data->alarms[2] & (0x01 << attr->index))
return sprintf(buf, "1\n");
else
return sprintf(buf, "0\n");
}
static ssize_t show_bank1_mask(struct device *dev,
struct device_attribute *devattr, char *buf)
{
struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr);
struct abituguru_data *data = dev_get_drvdata(dev);
if (data->bank1_settings[attr->index][0] & attr->nr)
return sprintf(buf, "1\n");
else
return sprintf(buf, "0\n");
}
static ssize_t show_bank2_mask(struct device *dev,
struct device_attribute *devattr, char *buf)
{
struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr);
struct abituguru_data *data = dev_get_drvdata(dev);
if (data->bank2_settings[attr->index][0] & attr->nr)
return sprintf(buf, "1\n");
else
return sprintf(buf, "0\n");
}
static ssize_t store_bank1_mask(struct device *dev,
struct device_attribute *devattr, const char *buf, size_t count)
{
struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr);
struct abituguru_data *data = dev_get_drvdata(dev);
ssize_t ret;
u8 orig_val;
unsigned long mask;
ret = kstrtoul(buf, 10, &mask);
if (ret)
return ret;
ret = count;
mutex_lock(&data->update_lock);
orig_val = data->bank1_settings[attr->index][0];
if (mask)
data->bank1_settings[attr->index][0] |= attr->nr;
else
data->bank1_settings[attr->index][0] &= ~attr->nr;
if ((data->bank1_settings[attr->index][0] != orig_val) &&
(abituguru_write(data,
ABIT_UGURU_SENSOR_BANK1 + 2, attr->index,
data->bank1_settings[attr->index], 3) < 1)) {
data->bank1_settings[attr->index][0] = orig_val;
ret = -EIO;
}
mutex_unlock(&data->update_lock);
return ret;
}
static ssize_t store_bank2_mask(struct device *dev,
struct device_attribute *devattr, const char *buf, size_t count)
{
struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr);
struct abituguru_data *data = dev_get_drvdata(dev);
ssize_t ret;
u8 orig_val;
unsigned long mask;
ret = kstrtoul(buf, 10, &mask);
if (ret)
return ret;
ret = count;
mutex_lock(&data->update_lock);