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linux/drivers/hwmon/nct6775-platform.c
Zev Weiss f4e6960f4f hwmon: (nct6775) Fix platform driver suspend regression 
Commit c3963bc0a0 ("hwmon: (nct6775) Split core and platform
driver") introduced a slight change in nct6775_suspend() in order to
avoid an otherwise-needless symbol export for nct6775_update_device(),
replacing a call to that function with a simple dev_get_drvdata()
instead.

As it turns out, there is no guarantee that nct6775_update_device()
is ever called prior to suspend. If this happens, the resume function
ends up writing bad data into the various chip registers, which results
in a crash shortly after resume.

To fix the problem, just add the symbol export and return to using
nct6775_update_device() as was employed previously.

Reported-by: Zoltán Kővágó <dirty.ice.hu@gmail.com>
Tested-by: Zoltán Kővágó <dirty.ice.hu@gmail.com>
Fixes: c3963bc0a0 ("hwmon: (nct6775) Split core and platform driver")
Cc: stable@kernel.org
Signed-off-by: Zev Weiss <zev@bewilderbeest.net>
Link: https://lore.kernel.org/r/20220810052646.13825-1-zev@bewilderbeest.net
[groeck: Updated description]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2022-08-10 06:37:01 -07:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* nct6775 - Platform driver for the hardware monitoring
* functionality of Nuvoton NCT677x Super-I/O chips
*
* Copyright (C) 2012 Guenter Roeck <linux@roeck-us.net>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/acpi.h>
#include <linux/dmi.h>
#include <linux/hwmon-sysfs.h>
#include <linux/hwmon-vid.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/wmi.h>
#include "nct6775.h"
enum sensor_access { access_direct, access_asuswmi };
static const char * const nct6775_sio_names[] __initconst = {
"NCT6106D",
"NCT6116D",
"NCT6775F",
"NCT6776D/F",
"NCT6779D",
"NCT6791D",
"NCT6792D",
"NCT6793D",
"NCT6795D",
"NCT6796D",
"NCT6797D",
"NCT6798D",
};
static unsigned short force_id;
module_param(force_id, ushort, 0);
MODULE_PARM_DESC(force_id, "Override the detected device ID");
static unsigned short fan_debounce;
module_param(fan_debounce, ushort, 0);
MODULE_PARM_DESC(fan_debounce, "Enable debouncing for fan RPM signal");
#define DRVNAME "nct6775"
#define NCT6775_PORT_CHIPID 0x58
/*
* ISA constants
*/
#define IOREGION_ALIGNMENT (~7)
#define IOREGION_OFFSET 5
#define IOREGION_LENGTH 2
#define ADDR_REG_OFFSET 0
#define DATA_REG_OFFSET 1
/*
* Super-I/O constants and functions
*/
#define NCT6775_LD_ACPI 0x0a
#define NCT6775_LD_HWM 0x0b
#define NCT6775_LD_VID 0x0d
#define NCT6775_LD_12 0x12
#define SIO_REG_LDSEL 0x07 /* Logical device select */
#define SIO_REG_DEVID 0x20 /* Device ID (2 bytes) */
#define SIO_REG_ENABLE 0x30 /* Logical device enable */
#define SIO_REG_ADDR 0x60 /* Logical device address (2 bytes) */
#define SIO_NCT6106_ID 0xc450
#define SIO_NCT6116_ID 0xd280
#define SIO_NCT6775_ID 0xb470
#define SIO_NCT6776_ID 0xc330
#define SIO_NCT6779_ID 0xc560
#define SIO_NCT6791_ID 0xc800
#define SIO_NCT6792_ID 0xc910
#define SIO_NCT6793_ID 0xd120
#define SIO_NCT6795_ID 0xd350
#define SIO_NCT6796_ID 0xd420
#define SIO_NCT6797_ID 0xd450
#define SIO_NCT6798_ID 0xd428
#define SIO_ID_MASK 0xFFF8
/*
* Control registers
*/
#define NCT6775_REG_CR_FAN_DEBOUNCE 0xf0
struct nct6775_sio_data {
int sioreg;
int ld;
enum kinds kind;
enum sensor_access access;
/* superio_() callbacks */
void (*sio_outb)(struct nct6775_sio_data *sio_data, int reg, int val);
int (*sio_inb)(struct nct6775_sio_data *sio_data, int reg);
void (*sio_select)(struct nct6775_sio_data *sio_data, int ld);
int (*sio_enter)(struct nct6775_sio_data *sio_data);
void (*sio_exit)(struct nct6775_sio_data *sio_data);
};
#define ASUSWMI_MONITORING_GUID "466747A0-70EC-11DE-8A39-0800200C9A66"
#define ASUSWMI_METHODID_RSIO 0x5253494F
#define ASUSWMI_METHODID_WSIO 0x5753494F
#define ASUSWMI_METHODID_RHWM 0x5248574D
#define ASUSWMI_METHODID_WHWM 0x5748574D
#define ASUSWMI_UNSUPPORTED_METHOD 0xFFFFFFFE
static int nct6775_asuswmi_evaluate_method(u32 method_id, u8 bank, u8 reg, u8 val, u32 *retval)
{
#if IS_ENABLED(CONFIG_ACPI_WMI)
u32 args = bank | (reg << 8) | (val << 16);
struct acpi_buffer input = { (acpi_size) sizeof(args), &args };
struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
acpi_status status;
union acpi_object *obj;
u32 tmp = ASUSWMI_UNSUPPORTED_METHOD;
status = wmi_evaluate_method(ASUSWMI_MONITORING_GUID, 0,
method_id, &input, &output);
if (ACPI_FAILURE(status))
return -EIO;
obj = output.pointer;
if (obj && obj->type == ACPI_TYPE_INTEGER)
tmp = obj->integer.value;
if (retval)
*retval = tmp;
kfree(obj);
if (tmp == ASUSWMI_UNSUPPORTED_METHOD)
return -ENODEV;
return 0;
#else
return -EOPNOTSUPP;
#endif
}
static inline int nct6775_asuswmi_write(u8 bank, u8 reg, u8 val)
{
return nct6775_asuswmi_evaluate_method(ASUSWMI_METHODID_WHWM, bank,
reg, val, NULL);
}
static inline int nct6775_asuswmi_read(u8 bank, u8 reg, u8 *val)
{
u32 ret, tmp = 0;
ret = nct6775_asuswmi_evaluate_method(ASUSWMI_METHODID_RHWM, bank,
reg, 0, &tmp);
*val = tmp;
return ret;
}
static int superio_wmi_inb(struct nct6775_sio_data *sio_data, int reg)
{
int tmp = 0;
nct6775_asuswmi_evaluate_method(ASUSWMI_METHODID_RSIO, sio_data->ld,
reg, 0, &tmp);
return tmp;
}
static void superio_wmi_outb(struct nct6775_sio_data *sio_data, int reg, int val)
{
nct6775_asuswmi_evaluate_method(ASUSWMI_METHODID_WSIO, sio_data->ld,
reg, val, NULL);
}
static void superio_wmi_select(struct nct6775_sio_data *sio_data, int ld)
{
sio_data->ld = ld;
}
static int superio_wmi_enter(struct nct6775_sio_data *sio_data)
{
return 0;
}
static void superio_wmi_exit(struct nct6775_sio_data *sio_data)
{
}
static void superio_outb(struct nct6775_sio_data *sio_data, int reg, int val)
{
int ioreg = sio_data->sioreg;
outb(reg, ioreg);
outb(val, ioreg + 1);
}
static int superio_inb(struct nct6775_sio_data *sio_data, int reg)
{
int ioreg = sio_data->sioreg;
outb(reg, ioreg);
return inb(ioreg + 1);
}
static void superio_select(struct nct6775_sio_data *sio_data, int ld)
{
int ioreg = sio_data->sioreg;
outb(SIO_REG_LDSEL, ioreg);
outb(ld, ioreg + 1);
}
static int superio_enter(struct nct6775_sio_data *sio_data)
{
int ioreg = sio_data->sioreg;
/*
* Try to reserve <ioreg> and <ioreg + 1> for exclusive access.
*/
if (!request_muxed_region(ioreg, 2, DRVNAME))
return -EBUSY;
outb(0x87, ioreg);
outb(0x87, ioreg);
return 0;
}
static void superio_exit(struct nct6775_sio_data *sio_data)
{
int ioreg = sio_data->sioreg;
outb(0xaa, ioreg);
outb(0x02, ioreg);
outb(0x02, ioreg + 1);
release_region(ioreg, 2);
}
static inline void nct6775_wmi_set_bank(struct nct6775_data *data, u16 reg)
{
u8 bank = reg >> 8;
data->bank = bank;
}
static int nct6775_wmi_reg_read(void *ctx, unsigned int reg, unsigned int *val)
{
struct nct6775_data *data = ctx;
int err, word_sized = nct6775_reg_is_word_sized(data, reg);
u8 tmp = 0;
u16 res;
nct6775_wmi_set_bank(data, reg);
err = nct6775_asuswmi_read(data->bank, reg & 0xff, &tmp);
if (err)
return err;
res = tmp;
if (word_sized) {
err = nct6775_asuswmi_read(data->bank, (reg & 0xff) + 1, &tmp);
if (err)
return err;
res = (res << 8) + tmp;
}
*val = res;
return 0;
}
static int nct6775_wmi_reg_write(void *ctx, unsigned int reg, unsigned int value)
{
struct nct6775_data *data = ctx;
int res, word_sized = nct6775_reg_is_word_sized(data, reg);
nct6775_wmi_set_bank(data, reg);
if (word_sized) {
res = nct6775_asuswmi_write(data->bank, reg & 0xff, value >> 8);
if (res)
return res;
res = nct6775_asuswmi_write(data->bank, (reg & 0xff) + 1, value);
} else {
res = nct6775_asuswmi_write(data->bank, reg & 0xff, value);
}
return res;
}
/*
* On older chips, only registers 0x50-0x5f are banked.
* On more recent chips, all registers are banked.
* Assume that is the case and set the bank number for each access.
* Cache the bank number so it only needs to be set if it changes.
*/
static inline void nct6775_set_bank(struct nct6775_data *data, u16 reg)
{
u8 bank = reg >> 8;
if (data->bank != bank) {
outb_p(NCT6775_REG_BANK, data->addr + ADDR_REG_OFFSET);
outb_p(bank, data->addr + DATA_REG_OFFSET);
data->bank = bank;
}
}
static int nct6775_reg_read(void *ctx, unsigned int reg, unsigned int *val)
{
struct nct6775_data *data = ctx;
int word_sized = nct6775_reg_is_word_sized(data, reg);
nct6775_set_bank(data, reg);
outb_p(reg & 0xff, data->addr + ADDR_REG_OFFSET);
*val = inb_p(data->addr + DATA_REG_OFFSET);
if (word_sized) {
outb_p((reg & 0xff) + 1,
data->addr + ADDR_REG_OFFSET);
*val = (*val << 8) + inb_p(data->addr + DATA_REG_OFFSET);
}
return 0;
}
static int nct6775_reg_write(void *ctx, unsigned int reg, unsigned int value)
{
struct nct6775_data *data = ctx;
int word_sized = nct6775_reg_is_word_sized(data, reg);
nct6775_set_bank(data, reg);
outb_p(reg & 0xff, data->addr + ADDR_REG_OFFSET);
if (word_sized) {
outb_p(value >> 8, data->addr + DATA_REG_OFFSET);
outb_p((reg & 0xff) + 1,
data->addr + ADDR_REG_OFFSET);
}
outb_p(value & 0xff, data->addr + DATA_REG_OFFSET);
return 0;
}
static void nct6791_enable_io_mapping(struct nct6775_sio_data *sio_data)
{
int val;
val = sio_data->sio_inb(sio_data, NCT6791_REG_HM_IO_SPACE_LOCK_ENABLE);
if (val & 0x10) {
pr_info("Enabling hardware monitor logical device mappings.\n");
sio_data->sio_outb(sio_data, NCT6791_REG_HM_IO_SPACE_LOCK_ENABLE,
val & ~0x10);
}
}
static int __maybe_unused nct6775_suspend(struct device *dev)
{
int err;
u16 tmp;
struct nct6775_data *data = nct6775_update_device(dev);
if (IS_ERR(data))
return PTR_ERR(data);
mutex_lock(&data->update_lock);
err = nct6775_read_value(data, data->REG_VBAT, &tmp);
if (err)
goto out;
data->vbat = tmp;
if (data->kind == nct6775) {
err = nct6775_read_value(data, NCT6775_REG_FANDIV1, &tmp);
if (err)
goto out;
data->fandiv1 = tmp;
err = nct6775_read_value(data, NCT6775_REG_FANDIV2, &tmp);
if (err)
goto out;
data->fandiv2 = tmp;
}
out:
mutex_unlock(&data->update_lock);
return err;
}
static int __maybe_unused nct6775_resume(struct device *dev)
{
struct nct6775_data *data = dev_get_drvdata(dev);
struct nct6775_sio_data *sio_data = dev_get_platdata(dev);
int i, j, err = 0;
u8 reg;
mutex_lock(&data->update_lock);
data->bank = 0xff; /* Force initial bank selection */
err = sio_data->sio_enter(sio_data);
if (err)
goto abort;
sio_data->sio_select(sio_data, NCT6775_LD_HWM);
reg = sio_data->sio_inb(sio_data, SIO_REG_ENABLE);
if (reg != data->sio_reg_enable)
sio_data->sio_outb(sio_data, SIO_REG_ENABLE, data->sio_reg_enable);
if (data->kind == nct6791 || data->kind == nct6792 ||
data->kind == nct6793 || data->kind == nct6795 ||
data->kind == nct6796 || data->kind == nct6797 ||
data->kind == nct6798)
nct6791_enable_io_mapping(sio_data);
sio_data->sio_exit(sio_data);
/* Restore limits */
for (i = 0; i < data->in_num; i++) {
if (!(data->have_in & BIT(i)))
continue;
err = nct6775_write_value(data, data->REG_IN_MINMAX[0][i], data->in[i][1]);
if (err)
goto abort;
err = nct6775_write_value(data, data->REG_IN_MINMAX[1][i], data->in[i][2]);
if (err)
goto abort;
}
for (i = 0; i < ARRAY_SIZE(data->fan_min); i++) {
if (!(data->has_fan_min & BIT(i)))
continue;
err = nct6775_write_value(data, data->REG_FAN_MIN[i], data->fan_min[i]);
if (err)
goto abort;
}
for (i = 0; i < NUM_TEMP; i++) {
if (!(data->have_temp & BIT(i)))
continue;
for (j = 1; j < ARRAY_SIZE(data->reg_temp); j++)
if (data->reg_temp[j][i]) {
err = nct6775_write_temp(data, data->reg_temp[j][i],
data->temp[j][i]);
if (err)
goto abort;
}
}
/* Restore other settings */
err = nct6775_write_value(data, data->REG_VBAT, data->vbat);
if (err)
goto abort;
if (data->kind == nct6775) {
err = nct6775_write_value(data, NCT6775_REG_FANDIV1, data->fandiv1);
if (err)
goto abort;
err = nct6775_write_value(data, NCT6775_REG_FANDIV2, data->fandiv2);
}
abort:
/* Force re-reading all values */
data->valid = false;
mutex_unlock(&data->update_lock);
return err;
}
static SIMPLE_DEV_PM_OPS(nct6775_dev_pm_ops, nct6775_suspend, nct6775_resume);
static void
nct6775_check_fan_inputs(struct nct6775_data *data, struct nct6775_sio_data *sio_data)
{
bool fan3pin = false, fan4pin = false, fan4min = false;
bool fan5pin = false, fan6pin = false, fan7pin = false;
bool pwm3pin = false, pwm4pin = false, pwm5pin = false;
bool pwm6pin = false, pwm7pin = false;
/* Store SIO_REG_ENABLE for use during resume */
sio_data->sio_select(sio_data, NCT6775_LD_HWM);
data->sio_reg_enable = sio_data->sio_inb(sio_data, SIO_REG_ENABLE);
/* fan4 and fan5 share some pins with the GPIO and serial flash */
if (data->kind == nct6775) {
int cr2c = sio_data->sio_inb(sio_data, 0x2c);
fan3pin = cr2c & BIT(6);
pwm3pin = cr2c & BIT(7);
/* On NCT6775, fan4 shares pins with the fdc interface */
fan4pin = !(sio_data->sio_inb(sio_data, 0x2A) & 0x80);
} else if (data->kind == nct6776) {
bool gpok = sio_data->sio_inb(sio_data, 0x27) & 0x80;
const char *board_vendor, *board_name;
board_vendor = dmi_get_system_info(DMI_BOARD_VENDOR);
board_name = dmi_get_system_info(DMI_BOARD_NAME);
if (board_name && board_vendor &&
!strcmp(board_vendor, "ASRock")) {
/*
* Auxiliary fan monitoring is not enabled on ASRock
* Z77 Pro4-M if booted in UEFI Ultra-FastBoot mode.
* Observed with BIOS version 2.00.
*/
if (!strcmp(board_name, "Z77 Pro4-M")) {
if ((data->sio_reg_enable & 0xe0) != 0xe0) {
data->sio_reg_enable |= 0xe0;
sio_data->sio_outb(sio_data, SIO_REG_ENABLE,
data->sio_reg_enable);
}
}
}
if (data->sio_reg_enable & 0x80)
fan3pin = gpok;
else
fan3pin = !(sio_data->sio_inb(sio_data, 0x24) & 0x40);
if (data->sio_reg_enable & 0x40)
fan4pin = gpok;
else
fan4pin = sio_data->sio_inb(sio_data, 0x1C) & 0x01;
if (data->sio_reg_enable & 0x20)
fan5pin = gpok;
else
fan5pin = sio_data->sio_inb(sio_data, 0x1C) & 0x02;
fan4min = fan4pin;
pwm3pin = fan3pin;
} else if (data->kind == nct6106) {
int cr24 = sio_data->sio_inb(sio_data, 0x24);
fan3pin = !(cr24 & 0x80);
pwm3pin = cr24 & 0x08;
} else if (data->kind == nct6116) {
int cr1a = sio_data->sio_inb(sio_data, 0x1a);
int cr1b = sio_data->sio_inb(sio_data, 0x1b);
int cr24 = sio_data->sio_inb(sio_data, 0x24);
int cr2a = sio_data->sio_inb(sio_data, 0x2a);
int cr2b = sio_data->sio_inb(sio_data, 0x2b);
int cr2f = sio_data->sio_inb(sio_data, 0x2f);
fan3pin = !(cr2b & 0x10);
fan4pin = (cr2b & 0x80) || // pin 1(2)
(!(cr2f & 0x10) && (cr1a & 0x04)); // pin 65(66)
fan5pin = (cr2b & 0x80) || // pin 126(127)
(!(cr1b & 0x03) && (cr2a & 0x02)); // pin 94(96)
pwm3pin = fan3pin && (cr24 & 0x08);
pwm4pin = fan4pin;
pwm5pin = fan5pin;
} else {
/*
* NCT6779D, NCT6791D, NCT6792D, NCT6793D, NCT6795D, NCT6796D,
* NCT6797D, NCT6798D
*/
int cr1a = sio_data->sio_inb(sio_data, 0x1a);
int cr1b = sio_data->sio_inb(sio_data, 0x1b);
int cr1c = sio_data->sio_inb(sio_data, 0x1c);
int cr1d = sio_data->sio_inb(sio_data, 0x1d);
int cr2a = sio_data->sio_inb(sio_data, 0x2a);
int cr2b = sio_data->sio_inb(sio_data, 0x2b);
int cr2d = sio_data->sio_inb(sio_data, 0x2d);
int cr2f = sio_data->sio_inb(sio_data, 0x2f);
bool dsw_en = cr2f & BIT(3);
bool ddr4_en = cr2f & BIT(4);
int cre0;
int creb;
int cred;
sio_data->sio_select(sio_data, NCT6775_LD_12);
cre0 = sio_data->sio_inb(sio_data, 0xe0);
creb = sio_data->sio_inb(sio_data, 0xeb);
cred = sio_data->sio_inb(sio_data, 0xed);
fan3pin = !(cr1c & BIT(5));
fan4pin = !(cr1c & BIT(6));
fan5pin = !(cr1c & BIT(7));
pwm3pin = !(cr1c & BIT(0));
pwm4pin = !(cr1c & BIT(1));
pwm5pin = !(cr1c & BIT(2));
switch (data->kind) {
case nct6791:
fan6pin = cr2d & BIT(1);
pwm6pin = cr2d & BIT(0);
break;
case nct6792:
fan6pin = !dsw_en && (cr2d & BIT(1));
pwm6pin = !dsw_en && (cr2d & BIT(0));
break;
case nct6793:
fan5pin |= cr1b & BIT(5);
fan5pin |= creb & BIT(5);
fan6pin = !dsw_en && (cr2d & BIT(1));
fan6pin |= creb & BIT(3);
pwm5pin |= cr2d & BIT(7);
pwm5pin |= (creb & BIT(4)) && !(cr2a & BIT(0));
pwm6pin = !dsw_en && (cr2d & BIT(0));
pwm6pin |= creb & BIT(2);
break;
case nct6795:
fan5pin |= cr1b & BIT(5);
fan5pin |= creb & BIT(5);
fan6pin = (cr2a & BIT(4)) &&
(!dsw_en || (cred & BIT(4)));
fan6pin |= creb & BIT(3);
pwm5pin |= cr2d & BIT(7);
pwm5pin |= (creb & BIT(4)) && !(cr2a & BIT(0));
pwm6pin = (cr2a & BIT(3)) && (cred & BIT(2));
pwm6pin |= creb & BIT(2);
break;
case nct6796:
fan5pin |= cr1b & BIT(5);
fan5pin |= (cre0 & BIT(3)) && !(cr1b & BIT(0));
fan5pin |= creb & BIT(5);
fan6pin = (cr2a & BIT(4)) &&
(!dsw_en || (cred & BIT(4)));
fan6pin |= creb & BIT(3);
fan7pin = !(cr2b & BIT(2));
pwm5pin |= cr2d & BIT(7);
pwm5pin |= (cre0 & BIT(4)) && !(cr1b & BIT(0));
pwm5pin |= (creb & BIT(4)) && !(cr2a & BIT(0));
pwm6pin = (cr2a & BIT(3)) && (cred & BIT(2));
pwm6pin |= creb & BIT(2);
pwm7pin = !(cr1d & (BIT(2) | BIT(3)));
break;
case nct6797:
fan5pin |= !ddr4_en && (cr1b & BIT(5));
fan5pin |= creb & BIT(5);
fan6pin = cr2a & BIT(4);
fan6pin |= creb & BIT(3);
fan7pin = cr1a & BIT(1);
pwm5pin |= (creb & BIT(4)) && !(cr2a & BIT(0));
pwm5pin |= !ddr4_en && (cr2d & BIT(7));
pwm6pin = creb & BIT(2);
pwm6pin |= cred & BIT(2);
pwm7pin = cr1d & BIT(4);
break;
case nct6798:
fan6pin = !(cr1b & BIT(0)) && (cre0 & BIT(3));
fan6pin |= cr2a & BIT(4);
fan6pin |= creb & BIT(5);
fan7pin = cr1b & BIT(5);
fan7pin |= !(cr2b & BIT(2));
fan7pin |= creb & BIT(3);
pwm6pin = !(cr1b & BIT(0)) && (cre0 & BIT(4));
pwm6pin |= !(cred & BIT(2)) && (cr2a & BIT(3));
pwm6pin |= (creb & BIT(4)) && !(cr2a & BIT(0));
pwm7pin = !(cr1d & (BIT(2) | BIT(3)));
pwm7pin |= cr2d & BIT(7);
pwm7pin |= creb & BIT(2);
break;
default: /* NCT6779D */
break;
}
fan4min = fan4pin;
}
/* fan 1 and 2 (0x03) are always present */
data->has_fan = 0x03 | (fan3pin << 2) | (fan4pin << 3) |
(fan5pin << 4) | (fan6pin << 5) | (fan7pin << 6);
data->has_fan_min = 0x03 | (fan3pin << 2) | (fan4min << 3) |
(fan5pin << 4) | (fan6pin << 5) | (fan7pin << 6);
data->has_pwm = 0x03 | (pwm3pin << 2) | (pwm4pin << 3) |
(pwm5pin << 4) | (pwm6pin << 5) | (pwm7pin << 6);
}
static ssize_t
cpu0_vid_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct nct6775_data *data = dev_get_drvdata(dev);
return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
}
static DEVICE_ATTR_RO(cpu0_vid);
/* Case open detection */
static const u8 NCT6775_REG_CR_CASEOPEN_CLR[] = { 0xe6, 0xee };
static const u8 NCT6775_CR_CASEOPEN_CLR_MASK[] = { 0x20, 0x01 };
static ssize_t
clear_caseopen(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct nct6775_data *data = dev_get_drvdata(dev);
struct nct6775_sio_data *sio_data = data->driver_data;
int nr = to_sensor_dev_attr(attr)->index - INTRUSION_ALARM_BASE;
unsigned long val;
u8 reg;
int ret;
if (kstrtoul(buf, 10, &val) || val != 0)
return -EINVAL;
mutex_lock(&data->update_lock);
/*
* Use CR registers to clear caseopen status.
* The CR registers are the same for all chips, and not all chips
* support clearing the caseopen status through "regular" registers.
*/
ret = sio_data->sio_enter(sio_data);
if (ret) {
count = ret;
goto error;
}
sio_data->sio_select(sio_data, NCT6775_LD_ACPI);
reg = sio_data->sio_inb(sio_data, NCT6775_REG_CR_CASEOPEN_CLR[nr]);
reg |= NCT6775_CR_CASEOPEN_CLR_MASK[nr];
sio_data->sio_outb(sio_data, NCT6775_REG_CR_CASEOPEN_CLR[nr], reg);
reg &= ~NCT6775_CR_CASEOPEN_CLR_MASK[nr];
sio_data->sio_outb(sio_data, NCT6775_REG_CR_CASEOPEN_CLR[nr], reg);
sio_data->sio_exit(sio_data);
data->valid = false; /* Force cache refresh */
error:
mutex_unlock(&data->update_lock);
return count;
}
static SENSOR_DEVICE_ATTR(intrusion0_alarm, 0644, nct6775_show_alarm,
clear_caseopen, INTRUSION_ALARM_BASE);
static SENSOR_DEVICE_ATTR(intrusion1_alarm, 0644, nct6775_show_alarm,
clear_caseopen, INTRUSION_ALARM_BASE + 1);
static SENSOR_DEVICE_ATTR(intrusion0_beep, 0644, nct6775_show_beep,
nct6775_store_beep, INTRUSION_ALARM_BASE);
static SENSOR_DEVICE_ATTR(intrusion1_beep, 0644, nct6775_show_beep,
nct6775_store_beep, INTRUSION_ALARM_BASE + 1);
static SENSOR_DEVICE_ATTR(beep_enable, 0644, nct6775_show_beep,
nct6775_store_beep, BEEP_ENABLE_BASE);
static umode_t nct6775_other_is_visible(struct kobject *kobj,
struct attribute *attr, int index)
{
struct device *dev = kobj_to_dev(kobj);
struct nct6775_data *data = dev_get_drvdata(dev);
if (index == 0 && !data->have_vid)
return 0;
if (index == 1 || index == 2) {
if (data->ALARM_BITS[INTRUSION_ALARM_BASE + index - 1] < 0)
return 0;
}
if (index == 3 || index == 4) {
if (data->BEEP_BITS[INTRUSION_ALARM_BASE + index - 3] < 0)
return 0;
}
return nct6775_attr_mode(data, attr);
}
/*
* nct6775_other_is_visible uses the index into the following array
* to determine if attributes should be created or not.
* Any change in order or content must be matched.
*/
static struct attribute *nct6775_attributes_other[] = {
&dev_attr_cpu0_vid.attr, /* 0 */
&sensor_dev_attr_intrusion0_alarm.dev_attr.attr, /* 1 */
&sensor_dev_attr_intrusion1_alarm.dev_attr.attr, /* 2 */
&sensor_dev_attr_intrusion0_beep.dev_attr.attr, /* 3 */
&sensor_dev_attr_intrusion1_beep.dev_attr.attr, /* 4 */
&sensor_dev_attr_beep_enable.dev_attr.attr, /* 5 */
NULL
};
static const struct attribute_group nct6775_group_other = {
.attrs = nct6775_attributes_other,
.is_visible = nct6775_other_is_visible,
};
static int nct6775_platform_probe_init(struct nct6775_data *data)
{
int err;
u8 cr2a;
struct nct6775_sio_data *sio_data = data->driver_data;
err = sio_data->sio_enter(sio_data);
if (err)
return err;
cr2a = sio_data->sio_inb(sio_data, 0x2a);
switch (data->kind) {
case nct6775:
data->have_vid = (cr2a & 0x40);
break;
case nct6776:
data->have_vid = (cr2a & 0x60) == 0x40;
break;
case nct6106:
case nct6116:
case nct6779:
case nct6791:
case nct6792:
case nct6793:
case nct6795:
case nct6796:
case nct6797:
case nct6798:
break;
}
/*
* Read VID value
* We can get the VID input values directly at logical device D 0xe3.
*/
if (data->have_vid) {
sio_data->sio_select(sio_data, NCT6775_LD_VID);
data->vid = sio_data->sio_inb(sio_data, 0xe3);
data->vrm = vid_which_vrm();
}
if (fan_debounce) {
u8 tmp;
sio_data->sio_select(sio_data, NCT6775_LD_HWM);
tmp = sio_data->sio_inb(sio_data,
NCT6775_REG_CR_FAN_DEBOUNCE);
switch (data->kind) {
case nct6106:
case nct6116:
tmp |= 0xe0;
break;
case nct6775:
tmp |= 0x1e;
break;
case nct6776:
case nct6779:
tmp |= 0x3e;
break;
case nct6791:
case nct6792:
case nct6793:
case nct6795:
case nct6796:
case nct6797:
case nct6798:
tmp |= 0x7e;
break;
}
sio_data->sio_outb(sio_data, NCT6775_REG_CR_FAN_DEBOUNCE,
tmp);
pr_info("Enabled fan debounce for chip %s\n", data->name);
}
nct6775_check_fan_inputs(data, sio_data);
sio_data->sio_exit(sio_data);
return nct6775_add_attr_group(data, &nct6775_group_other);
}
static const struct regmap_config nct6775_regmap_config = {
.reg_bits = 16,
.val_bits = 16,
.reg_read = nct6775_reg_read,
.reg_write = nct6775_reg_write,
};
static const struct regmap_config nct6775_wmi_regmap_config = {
.reg_bits = 16,
.val_bits = 16,
.reg_read = nct6775_wmi_reg_read,
.reg_write = nct6775_wmi_reg_write,
};
static int nct6775_platform_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct nct6775_sio_data *sio_data = dev_get_platdata(dev);
struct nct6775_data *data;
struct resource *res;
const struct regmap_config *regmapcfg;
if (sio_data->access == access_direct) {
res = platform_get_resource(pdev, IORESOURCE_IO, 0);
if (!devm_request_region(&pdev->dev, res->start, IOREGION_LENGTH, DRVNAME))
return -EBUSY;
}
data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->kind = sio_data->kind;
data->sioreg = sio_data->sioreg;
if (sio_data->access == access_direct) {
data->addr = res->start;
regmapcfg = &nct6775_regmap_config;
} else {
regmapcfg = &nct6775_wmi_regmap_config;
}
platform_set_drvdata(pdev, data);
data->driver_data = sio_data;
data->driver_init = nct6775_platform_probe_init;
return nct6775_probe(&pdev->dev, data, regmapcfg);
}
static struct platform_driver nct6775_driver = {
.driver = {
.name = DRVNAME,
.pm = &nct6775_dev_pm_ops,
},
.probe = nct6775_platform_probe,
};
/* nct6775_find() looks for a '627 in the Super-I/O config space */
static int __init nct6775_find(int sioaddr, struct nct6775_sio_data *sio_data)
{
u16 val;
int err;
int addr;
sio_data->access = access_direct;
sio_data->sioreg = sioaddr;
err = sio_data->sio_enter(sio_data);
if (err)
return err;
val = (sio_data->sio_inb(sio_data, SIO_REG_DEVID) << 8) |
sio_data->sio_inb(sio_data, SIO_REG_DEVID + 1);
if (force_id && val != 0xffff)
val = force_id;
switch (val & SIO_ID_MASK) {
case SIO_NCT6106_ID:
sio_data->kind = nct6106;
break;
case SIO_NCT6116_ID:
sio_data->kind = nct6116;
break;
case SIO_NCT6775_ID:
sio_data->kind = nct6775;
break;
case SIO_NCT6776_ID:
sio_data->kind = nct6776;
break;
case SIO_NCT6779_ID:
sio_data->kind = nct6779;
break;
case SIO_NCT6791_ID:
sio_data->kind = nct6791;
break;
case SIO_NCT6792_ID:
sio_data->kind = nct6792;
break;
case SIO_NCT6793_ID:
sio_data->kind = nct6793;
break;
case SIO_NCT6795_ID:
sio_data->kind = nct6795;
break;
case SIO_NCT6796_ID:
sio_data->kind = nct6796;
break;
case SIO_NCT6797_ID:
sio_data->kind = nct6797;
break;
case SIO_NCT6798_ID:
sio_data->kind = nct6798;
break;
default:
if (val != 0xffff)
pr_debug("unsupported chip ID: 0x%04x\n", val);
sio_data->sio_exit(sio_data);
return -ENODEV;
}
/* We have a known chip, find the HWM I/O address */
sio_data->sio_select(sio_data, NCT6775_LD_HWM);
val = (sio_data->sio_inb(sio_data, SIO_REG_ADDR) << 8)
| sio_data->sio_inb(sio_data, SIO_REG_ADDR + 1);
addr = val & IOREGION_ALIGNMENT;
if (addr == 0) {
pr_err("Refusing to enable a Super-I/O device with a base I/O port 0\n");
sio_data->sio_exit(sio_data);
return -ENODEV;
}
/* Activate logical device if needed */
val = sio_data->sio_inb(sio_data, SIO_REG_ENABLE);
if (!(val & 0x01)) {
pr_warn("Forcibly enabling Super-I/O. Sensor is probably unusable.\n");
sio_data->sio_outb(sio_data, SIO_REG_ENABLE, val | 0x01);
}
if (sio_data->kind == nct6791 || sio_data->kind == nct6792 ||
sio_data->kind == nct6793 || sio_data->kind == nct6795 ||
sio_data->kind == nct6796 || sio_data->kind == nct6797 ||
sio_data->kind == nct6798)
nct6791_enable_io_mapping(sio_data);
sio_data->sio_exit(sio_data);
pr_info("Found %s or compatible chip at %#x:%#x\n",
nct6775_sio_names[sio_data->kind], sioaddr, addr);
return addr;
}
/*
* when Super-I/O functions move to a separate file, the Super-I/O
* bus will manage the lifetime of the device and this module will only keep
* track of the nct6775 driver. But since we use platform_device_alloc(), we
* must keep track of the device
*/
static struct platform_device *pdev[2];
static const char * const asus_wmi_boards[] = {
"PRO H410T",
"ProArt X570-CREATOR WIFI",
"Pro B550M-C",
"Pro WS X570-ACE",
"PRIME B360-PLUS",
"PRIME B460-PLUS",
"PRIME B550-PLUS",
"PRIME B550M-A",
"PRIME B550M-A (WI-FI)",
"PRIME H410M-R",
"PRIME X570-P",
"PRIME X570-PRO",
"ROG CROSSHAIR VIII DARK HERO",
"ROG CROSSHAIR VIII FORMULA",
"ROG CROSSHAIR VIII HERO",
"ROG CROSSHAIR VIII IMPACT",
"ROG STRIX B550-A GAMING",
"ROG STRIX B550-E GAMING",
"ROG STRIX B550-F GAMING",
"ROG STRIX B550-F GAMING (WI-FI)",
"ROG STRIX B550-F GAMING WIFI II",
"ROG STRIX B550-I GAMING",
"ROG STRIX B550-XE GAMING (WI-FI)",
"ROG STRIX X570-E GAMING",
"ROG STRIX X570-E GAMING WIFI II",
"ROG STRIX X570-F GAMING",
"ROG STRIX X570-I GAMING",
"ROG STRIX Z390-E GAMING",
"ROG STRIX Z390-F GAMING",
"ROG STRIX Z390-H GAMING",
"ROG STRIX Z390-I GAMING",
"ROG STRIX Z490-A GAMING",
"ROG STRIX Z490-E GAMING",
"ROG STRIX Z490-F GAMING",
"ROG STRIX Z490-G GAMING",
"ROG STRIX Z490-G GAMING (WI-FI)",
"ROG STRIX Z490-H GAMING",
"ROG STRIX Z490-I GAMING",
"TUF GAMING B550M-PLUS",
"TUF GAMING B550M-PLUS (WI-FI)",
"TUF GAMING B550-PLUS",
"TUF GAMING B550-PLUS WIFI II",
"TUF GAMING B550-PRO",
"TUF GAMING X570-PLUS",
"TUF GAMING X570-PLUS (WI-FI)",
"TUF GAMING X570-PRO (WI-FI)",
"TUF GAMING Z490-PLUS",
"TUF GAMING Z490-PLUS (WI-FI)",
};
static int __init sensors_nct6775_platform_init(void)
{
int i, err;
bool found = false;
int address;
struct resource res;
struct nct6775_sio_data sio_data;
int sioaddr[2] = { 0x2e, 0x4e };
enum sensor_access access = access_direct;
const char *board_vendor, *board_name;
u8 tmp;
err = platform_driver_register(&nct6775_driver);
if (err)
return err;
board_vendor = dmi_get_system_info(DMI_BOARD_VENDOR);
board_name = dmi_get_system_info(DMI_BOARD_NAME);
if (board_name && board_vendor &&
!strcmp(board_vendor, "ASUSTeK COMPUTER INC.")) {
err = match_string(asus_wmi_boards, ARRAY_SIZE(asus_wmi_boards),
board_name);
if (err >= 0) {
/* if reading chip id via WMI succeeds, use WMI */
if (!nct6775_asuswmi_read(0, NCT6775_PORT_CHIPID, &tmp) && tmp) {
pr_info("Using Asus WMI to access %#x chip.\n", tmp);
access = access_asuswmi;
} else {
pr_err("Can't read ChipID by Asus WMI.\n");
}
}
}
/*
* initialize sio_data->kind and sio_data->sioreg.
*
* when Super-I/O functions move to a separate file, the Super-I/O
* driver will probe 0x2e and 0x4e and auto-detect the presence of a
* nct6775 hardware monitor, and call probe()
*/
for (i = 0; i < ARRAY_SIZE(pdev); i++) {
sio_data.sio_outb = superio_outb;
sio_data.sio_inb = superio_inb;
sio_data.sio_select = superio_select;
sio_data.sio_enter = superio_enter;
sio_data.sio_exit = superio_exit;
address = nct6775_find(sioaddr[i], &sio_data);
if (address <= 0)
continue;
found = true;
sio_data.access = access;
if (access == access_asuswmi) {
sio_data.sio_outb = superio_wmi_outb;
sio_data.sio_inb = superio_wmi_inb;
sio_data.sio_select = superio_wmi_select;
sio_data.sio_enter = superio_wmi_enter;
sio_data.sio_exit = superio_wmi_exit;
}
pdev[i] = platform_device_alloc(DRVNAME, address);
if (!pdev[i]) {
err = -ENOMEM;
goto exit_device_unregister;
}
err = platform_device_add_data(pdev[i], &sio_data,
sizeof(struct nct6775_sio_data));
if (err)
goto exit_device_put;
if (sio_data.access == access_direct) {
memset(&res, 0, sizeof(res));
res.name = DRVNAME;
res.start = address + IOREGION_OFFSET;
res.end = address + IOREGION_OFFSET + IOREGION_LENGTH - 1;
res.flags = IORESOURCE_IO;
err = acpi_check_resource_conflict(&res);
if (err) {
platform_device_put(pdev[i]);
pdev[i] = NULL;
continue;
}
err = platform_device_add_resources(pdev[i], &res, 1);
if (err)
goto exit_device_put;
}
/* platform_device_add calls probe() */
err = platform_device_add(pdev[i]);
if (err)
goto exit_device_put;
}
if (!found) {
err = -ENODEV;
goto exit_unregister;
}
return 0;
exit_device_put:
platform_device_put(pdev[i]);
exit_device_unregister:
while (i--)
platform_device_unregister(pdev[i]);
exit_unregister:
platform_driver_unregister(&nct6775_driver);
return err;
}
static void __exit sensors_nct6775_platform_exit(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(pdev); i++)
platform_device_unregister(pdev[i]);
platform_driver_unregister(&nct6775_driver);
}
MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
MODULE_DESCRIPTION("Platform driver for NCT6775F and compatible chips");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS(HWMON_NCT6775);
module_init(sensors_nct6775_platform_init);
module_exit(sensors_nct6775_platform_exit);
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