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i2c-piix4-aura-dkms/src/i2c-nct6775.c

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/*
* i2c-nct6775 - Driver for the SMBus master functionality of
* Nuvoton NCT677x Super-I/O chips
*
* Copyright (C) 2019 Adam Honse <calcprogrammer1@gmail.com>
*
* Derived from nct6775 hwmon driver
* Copyright (C) 2012 Guenter Roeck <linux@roeck-us.net>
*
* 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.
*
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/platform_device.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/delay.h>
#include <linux/ioport.h>
#include <linux/i2c.h>
#include <linux/acpi.h>
#include <linux/bitops.h>
#include <linux/dmi.h>
#include <linux/io.h>
#include <linux/nospec.h>
#define DRVNAME "i2c-nct6775"
/* Nuvoton SMBus address offsets */
#define SMBHSTDAT (0 + nuvoton_nct6793d_smba)
#define SMBBLKSZ (1 + nuvoton_nct6793d_smba)
#define SMBHSTCMD (2 + nuvoton_nct6793d_smba)
#define SMBHSTIDX (3 + nuvoton_nct6793d_smba) //Index field is the Command field on other controllers
#define SMBHSTCTL (4 + nuvoton_nct6793d_smba)
#define SMBHSTADD (5 + nuvoton_nct6793d_smba)
#define SMBHSTERR (9 + nuvoton_nct6793d_smba)
#define SMBHSTSTS (0xE + nuvoton_nct6793d_smba)
/* Command register */
#define NCT6793D_READ_BYTE 0
#define NCT6793D_READ_WORD 1
#define NCT6793D_READ_BLOCK 2
#define NCT6793D_BLOCK_WRITE_READ_PROC_CALL 3
#define NCT6793D_PROC_CALL 4
#define NCT6793D_WRITE_BYTE 8
#define NCT6793D_WRITE_WORD 9
#define NCT6793D_WRITE_BLOCK 10
/* Control register */
#define NCT6793D_MANUAL_START 128
#define NCT6793D_SOFT_RESET 64
/* Error register */
#define NCT6793D_NO_ACK 32
/* Status register */
#define NCT6793D_FIFO_EMPTY 1
#define NCT6793D_FIFO_FULL 2
#define NCT6793D_MANUAL_ACTIVE 4
#define NCT6775_LD_SMBUS 0x0B
/* Other settings */
#define MAX_RETRIES 400
enum kinds { nct6106, nct6775, nct6776, nct6779, nct6791, nct6792, nct6793,
nct6795, nct6796, nct6798 };
struct nct6775_sio_data {
int sioreg;
enum kinds kind;
};
/* used to set data->name = nct6775_device_names[data->sio_kind] */
static const char * const nct6775_device_names[] = {
"nct6106",
"nct6775",
"nct6776",
"nct6779",
"nct6791",
"nct6792",
"nct6793",
"nct6795",
"nct6796",
"nct6798",
};
static const char * const nct6775_sio_names[] __initconst = {
"NCT6106D",
"NCT6775F",
"NCT6776D/F",
"NCT6779D",
"NCT6791D",
"NCT6792D",
"NCT6793D",
"NCT6795D",
"NCT6796D",
"NCT6798D",
};
#define SIO_REG_LDSEL 0x07 /* Logical device select */
#define SIO_REG_DEVID 0x20 /* Device ID (2 bytes) */
#define SIO_REG_SMBA 0x62 /* SMBus base address register */
#define SIO_NCT6106_ID 0xc450
#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_NCT6798_ID 0xd428
#define SIO_ID_MASK 0xFFF0
static inline void
superio_outb(int ioreg, int reg, int val)
{
outb(reg, ioreg);
outb(val, ioreg + 1);
}
static inline int
superio_inb(int ioreg, int reg)
{
outb(reg, ioreg);
return inb(ioreg + 1);
}
static inline void
superio_select(int ioreg, int ld)
{
outb(SIO_REG_LDSEL, ioreg);
outb(ld, ioreg + 1);
}
static inline int
superio_enter(int ioreg)
{
/*
* 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 inline void
superio_exit(int ioreg)
{
outb(0xaa, ioreg);
outb(0x02, ioreg);
outb(0x02, ioreg + 1);
release_region(ioreg, 2);
}
/*
* ISA constants
*/
#define IOREGION_ALIGNMENT (~7)
#define IOREGION_LENGTH 2
#define ADDR_REG_OFFSET 0
#define DATA_REG_OFFSET 1
#define NCT6775_REG_BANK 0x4E
#define NCT6775_REG_CONFIG 0x40
static struct i2c_adapter *nct6775_adapter;
struct i2c_nct6775_adapdata {
unsigned short smba;
};
/* Return negative errno on error. */
static s32 nct6775_access(struct i2c_adapter * adap, u16 addr,
unsigned short flags, char read_write,
u8 command, int size, union i2c_smbus_data * data)
{
struct i2c_nct6775_adapdata *adapdata = i2c_get_adapdata(adap);
unsigned short nuvoton_nct6793d_smba = adapdata->smba;
int i, len, cnt;
union i2c_smbus_data tmp_data;
int timeout = 0;
tmp_data.word = 0;
cnt = 0;
len = 0;
outb_p(NCT6793D_SOFT_RESET, SMBHSTCTL);
switch (size) {
case I2C_SMBUS_QUICK:
outb_p((addr << 1) | read_write,
SMBHSTADD);
break;
case I2C_SMBUS_BYTE_DATA:
tmp_data.byte = data->byte;
case I2C_SMBUS_BYTE:
outb_p((addr << 1) | read_write,
SMBHSTADD);
outb_p(command, SMBHSTIDX);
if (read_write == I2C_SMBUS_WRITE) {
outb_p(tmp_data.byte, SMBHSTDAT);
outb_p(NCT6793D_WRITE_BYTE, SMBHSTCMD);
}
else {
outb_p(NCT6793D_READ_BYTE, SMBHSTCMD);
}
break;
case I2C_SMBUS_WORD_DATA:
outb_p((addr << 1) | read_write,
SMBHSTADD);
outb_p(command, SMBHSTIDX);
if (read_write == I2C_SMBUS_WRITE) {
outb_p(data->word & 0xff, SMBHSTDAT);
outb_p((data->word & 0xff00) >> 8, SMBHSTDAT);
outb_p(NCT6793D_WRITE_WORD, SMBHSTCMD);
}
else {
outb_p(NCT6793D_READ_WORD, SMBHSTCMD);
}
break;
case I2C_SMBUS_BLOCK_DATA:
outb_p((addr << 1) | read_write,
SMBHSTADD);
outb_p(command, SMBHSTIDX);
if (read_write == I2C_SMBUS_WRITE) {
len = data->block[0];
if (len == 0 || len > I2C_SMBUS_BLOCK_MAX)
return -EINVAL;
outb_p(len, SMBBLKSZ);
cnt = 1;
if (len >= 4) {
for (i = cnt; i <= 4; i++) {
outb_p(data->block[i], SMBHSTDAT);
}
len -= 4;
cnt += 4;
}
else {
for (i = cnt; i <= len; i++ ) {
outb_p(data->block[i], SMBHSTDAT);
}
len = 0;
}
outb_p(NCT6793D_WRITE_BLOCK, SMBHSTCMD);
}
else {
return -ENOTSUPP;
}
break;
default:
dev_warn(&adap->dev, "Unsupported transaction %d\n", size);
return -EOPNOTSUPP;
}
outb_p(NCT6793D_MANUAL_START, SMBHSTCTL);
while ((size == I2C_SMBUS_BLOCK_DATA) && (len > 0)) {
if (read_write == I2C_SMBUS_WRITE) {
timeout = 0;
while ((inb_p(SMBHSTSTS) & NCT6793D_FIFO_EMPTY) == 0)
{
if(timeout > MAX_RETRIES)
{
return -ETIMEDOUT;
}
usleep_range(250, 500);
timeout++;
}
//Load more bytes into FIFO
if (len >= 4) {
for (i = cnt; i <= (cnt + 4); i++) {
outb_p(data->block[i], SMBHSTDAT);
}
len -= 4;
cnt += 4;
}
else {
for (i = cnt; i <= (cnt + len); i++) {
outb_p(data->block[i], SMBHSTDAT);
}
len = 0;
}
}
else {
return -ENOTSUPP;
}
}
//wait for manual mode to complete
timeout = 0;
while ((inb_p(SMBHSTSTS) & NCT6793D_MANUAL_ACTIVE) != 0)
{
if(timeout > MAX_RETRIES)
{
return -ETIMEDOUT;
}
usleep_range(250, 500);
timeout++;
}
if ((inb_p(SMBHSTERR) & NCT6793D_NO_ACK) != 0) {
return -ENXIO;
}
else if ((read_write == I2C_SMBUS_WRITE) || (size == I2C_SMBUS_QUICK)) {
return 0;
}
switch (size) {
case I2C_SMBUS_QUICK:
case I2C_SMBUS_BYTE_DATA:
data->byte = inb_p(SMBHSTDAT);
break;
case I2C_SMBUS_WORD_DATA:
data->word = inb_p(SMBHSTDAT) + (inb_p(SMBHSTDAT) << 8);
break;
}
return 0;
}
static u32 nct6775_func(struct i2c_adapter *adapter)
{
return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
I2C_FUNC_SMBUS_BLOCK_DATA;
}
static const struct i2c_algorithm smbus_algorithm = {
.smbus_xfer = nct6775_access,
.functionality = nct6775_func,
};
static int nct6775_add_adapter(unsigned short smba, const char *name, struct i2c_adapter **padap)
{
struct i2c_adapter *adap;
struct i2c_nct6775_adapdata *adapdata;
int retval;
adap = kzalloc(sizeof(*adap), GFP_KERNEL);
if (adap == NULL) {
return -ENOMEM;
}
adap->owner = THIS_MODULE;
adap->class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
adap->algo = &smbus_algorithm;
adapdata = kzalloc(sizeof(*adapdata), GFP_KERNEL);
if (adapdata == NULL) {
kfree(adap);
return -ENOMEM;
}
adapdata->smba = smba;
snprintf(adap->name, sizeof(adap->name),
"SMBus NCT67xx adapter%s at %04x", name, smba);
i2c_set_adapdata(adap, adapdata);
retval = i2c_add_adapter(adap);
if (retval) {
kfree(adapdata);
kfree(adap);
return retval;
}
*padap = adap;
return 0;
}
static void nct6775_remove_adapter(struct i2c_adapter *adap)
{
struct i2c_nct6775_adapdata *adapdata = i2c_get_adapdata(adap);
if (adapdata->smba) {
i2c_del_adapter(adap);
kfree(adapdata);
kfree(adap);
}
}
//static SIMPLE_DEV_PM_OPS(nct6775_dev_pm_ops, nct6775_suspend, nct6775_resume);
/*
* 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 int nct6775_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct nct6775_sio_data *sio_data = dev_get_platdata(dev);
struct resource *res;
res = platform_get_resource(pdev, IORESOURCE_IO, 0);
if (!devm_request_region(&pdev->dev, res->start, IOREGION_LENGTH,
DRVNAME))
return -EBUSY;
switch (sio_data->kind) {
case nct6791:
case nct6792:
case nct6793:
case nct6795:
case nct6796:
case nct6798:
nct6775_add_adapter(res->start, "", &nct6775_adapter);
break;
default:
return -ENODEV;
}
return 0;
}
/*
static void nct6791_enable_io_mapping(int sioaddr)
{
int val;
val = superio_inb(sioaddr, NCT6791_REG_HM_IO_SPACE_LOCK_ENABLE);
if (val & 0x10) {
pr_info("Enabling hardware monitor logical device mappings.\n");
superio_outb(sioaddr, NCT6791_REG_HM_IO_SPACE_LOCK_ENABLE,
val & ~0x10);
}
}*/
static struct platform_driver i2c_nct6775_driver = {
.driver = {
.name = DRVNAME,
// .pm = &nct6775_dev_pm_ops,
},
.probe = nct6775_probe,
};
static void __exit i2c_nct6775_exit(void)
{
int i;
if(nct6775_adapter)
nct6775_remove_adapter(nct6775_adapter);
for (i = 0; i < ARRAY_SIZE(pdev); i++) {
if (pdev[i])
platform_device_unregister(pdev[i]);
}
platform_driver_unregister(&i2c_nct6775_driver);
}
/* 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;
err = superio_enter(sioaddr);
if (err)
return err;
val = (superio_inb(sioaddr, SIO_REG_DEVID) << 8) |
superio_inb(sioaddr, SIO_REG_DEVID + 1);
switch (val & SIO_ID_MASK) {
case SIO_NCT6106_ID:
sio_data->kind = nct6106;
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_NCT6798_ID:
sio_data->kind = nct6798;
break;
default:
if (val != 0xffff)
pr_debug("unsupported chip ID: 0x%04x\n", val);
superio_exit(sioaddr);
return -ENODEV;
}
/* We have a known chip, find the SMBus I/O address */
superio_select(sioaddr, NCT6775_LD_SMBUS);
val = (superio_inb(sioaddr, SIO_REG_SMBA) << 8)
| superio_inb(sioaddr, SIO_REG_SMBA + 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");
superio_exit(sioaddr);
return -ENODEV;
}
//if (sio_data->kind == nct6791 || sio_data->kind == nct6792 ||
// sio_data->kind == nct6793 || sio_data->kind == nct6795 ||
// sio_data->kind == nct6796)
// nct6791_enable_io_mapping(sioaddr);
superio_exit(sioaddr);
pr_info("Found %s or compatible chip at %#x:%#x\n",
nct6775_sio_names[sio_data->kind], sioaddr, addr);
sio_data->sioreg = sioaddr;
return addr;
}
static int __init i2c_nct6775_init(void)
{
int i, err;
bool found = false;
int address;
struct resource res;
struct nct6775_sio_data sio_data;
int sioaddr[2] = { 0x2e, 0x4e };
err = platform_driver_register(&i2c_nct6775_driver);
if (err)
return err;
/*
* 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++) {
address = nct6775_find(sioaddr[i], &sio_data);
if (address <= 0)
continue;
found = true;
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;
memset(&res, 0, sizeof(res));
res.name = DRVNAME;
res.start = address;
res.end = address + 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 >= 0) {
if (pdev[i])
platform_device_unregister(pdev[i]);
}
exit_unregister:
platform_driver_unregister(&i2c_nct6775_driver);
return err;
}
MODULE_AUTHOR("Adam Honse <calcprogrammer1@gmail.com>");
MODULE_DESCRIPTION("SMBus driver for NCT6775F and compatible chips");
MODULE_LICENSE("GPL");
module_init(i2c_nct6775_init);
module_exit(i2c_nct6775_exit);
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