648 lines
14 KiB
C
648 lines
14 KiB
C
/*
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* i2c-nct6775 - Driver for the SMBus master functionality of
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* Nuvoton NCT677x Super-I/O chips
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*
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* Copyright (C) 2019 Adam Honse <calcprogrammer1@gmail.com>
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*
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* Derived from nct6775 hwmon driver
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* Copyright (C) 2012 Guenter Roeck <linux@roeck-us.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/jiffies.h>
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#include <linux/platform_device.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/hwmon-vid.h>
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#include <linux/err.h>
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#include <linux/mutex.h>
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#include <linux/delay.h>
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#include <linux/ioport.h>
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#include <linux/i2c.h>
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#include <linux/acpi.h>
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#include <linux/bitops.h>
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#include <linux/dmi.h>
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#include <linux/io.h>
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#include <linux/nospec.h>
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#define DRVNAME "i2c-nct6775"
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/* Nuvoton SMBus address offsets */
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#define SMBHSTDAT (0 + nuvoton_nct6793d_smba)
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#define SMBBLKSZ (1 + nuvoton_nct6793d_smba)
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#define SMBHSTCMD (2 + nuvoton_nct6793d_smba)
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#define SMBHSTIDX (3 + nuvoton_nct6793d_smba) //Index field is the Command field on other controllers
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#define SMBHSTCTL (4 + nuvoton_nct6793d_smba)
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#define SMBHSTADD (5 + nuvoton_nct6793d_smba)
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#define SMBHSTERR (9 + nuvoton_nct6793d_smba)
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#define SMBHSTSTS (0xE + nuvoton_nct6793d_smba)
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/* Command register */
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#define NCT6793D_READ_BYTE 0
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#define NCT6793D_READ_WORD 1
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#define NCT6793D_READ_BLOCK 2
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#define NCT6793D_BLOCK_WRITE_READ_PROC_CALL 3
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#define NCT6793D_PROC_CALL 4
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#define NCT6793D_WRITE_BYTE 8
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#define NCT6793D_WRITE_WORD 9
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#define NCT6793D_WRITE_BLOCK 10
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/* Control register */
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#define NCT6793D_MANUAL_START 128
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#define NCT6793D_SOFT_RESET 64
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/* Error register */
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#define NCT6793D_NO_ACK 32
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/* Status register */
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#define NCT6793D_FIFO_EMPTY 1
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#define NCT6793D_FIFO_FULL 2
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#define NCT6793D_MANUAL_ACTIVE 4
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#define NCT6775_LD_SMBUS 0x0B
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/* Other settings */
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#define MAX_RETRIES 400
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enum kinds { nct6106, nct6775, nct6776, nct6779, nct6791, nct6792, nct6793,
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nct6795, nct6796, nct6798 };
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struct nct6775_sio_data {
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int sioreg;
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enum kinds kind;
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};
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/* used to set data->name = nct6775_device_names[data->sio_kind] */
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static const char * const nct6775_device_names[] = {
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"nct6106",
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"nct6775",
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"nct6776",
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"nct6779",
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"nct6791",
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"nct6792",
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"nct6793",
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"nct6795",
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"nct6796",
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"nct6798",
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};
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static const char * const nct6775_sio_names[] __initconst = {
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"NCT6106D",
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"NCT6775F",
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"NCT6776D/F",
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"NCT6779D",
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"NCT6791D",
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"NCT6792D",
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"NCT6793D",
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"NCT6795D",
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"NCT6796D",
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"NCT6798D",
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};
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#define SIO_REG_LDSEL 0x07 /* Logical device select */
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#define SIO_REG_DEVID 0x20 /* Device ID (2 bytes) */
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#define SIO_REG_SMBA 0x62 /* SMBus base address register */
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#define SIO_NCT6106_ID 0xc450
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#define SIO_NCT6775_ID 0xb470
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#define SIO_NCT6776_ID 0xc330
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#define SIO_NCT6779_ID 0xc560
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#define SIO_NCT6791_ID 0xc800
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#define SIO_NCT6792_ID 0xc910
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#define SIO_NCT6793_ID 0xd120
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#define SIO_NCT6795_ID 0xd350
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#define SIO_NCT6796_ID 0xd420
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#define SIO_NCT6798_ID 0xd428
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#define SIO_ID_MASK 0xFFF0
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static inline void
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superio_outb(int ioreg, int reg, int val)
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{
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outb(reg, ioreg);
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outb(val, ioreg + 1);
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}
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static inline int
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superio_inb(int ioreg, int reg)
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{
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outb(reg, ioreg);
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return inb(ioreg + 1);
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}
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static inline void
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superio_select(int ioreg, int ld)
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{
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outb(SIO_REG_LDSEL, ioreg);
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outb(ld, ioreg + 1);
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}
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static inline int
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superio_enter(int ioreg)
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{
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/*
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* Try to reserve <ioreg> and <ioreg + 1> for exclusive access.
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*/
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if (!request_muxed_region(ioreg, 2, DRVNAME))
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return -EBUSY;
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outb(0x87, ioreg);
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outb(0x87, ioreg);
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return 0;
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}
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static inline void
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superio_exit(int ioreg)
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{
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outb(0xaa, ioreg);
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outb(0x02, ioreg);
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outb(0x02, ioreg + 1);
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release_region(ioreg, 2);
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}
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/*
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* ISA constants
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*/
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#define IOREGION_ALIGNMENT (~7)
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#define IOREGION_LENGTH 2
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#define ADDR_REG_OFFSET 0
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#define DATA_REG_OFFSET 1
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#define NCT6775_REG_BANK 0x4E
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#define NCT6775_REG_CONFIG 0x40
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static struct i2c_adapter *nct6775_adapter;
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struct i2c_nct6775_adapdata {
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unsigned short smba;
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};
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/* Return negative errno on error. */
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static s32 nct6775_access(struct i2c_adapter * adap, u16 addr,
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unsigned short flags, char read_write,
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u8 command, int size, union i2c_smbus_data * data)
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{
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struct i2c_nct6775_adapdata *adapdata = i2c_get_adapdata(adap);
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unsigned short nuvoton_nct6793d_smba = adapdata->smba;
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int i, len, cnt;
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union i2c_smbus_data tmp_data;
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int timeout = 0;
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tmp_data.word = 0;
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cnt = 0;
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len = 0;
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outb_p(NCT6793D_SOFT_RESET, SMBHSTCTL);
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switch (size) {
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case I2C_SMBUS_QUICK:
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outb_p((addr << 1) | read_write,
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SMBHSTADD);
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break;
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case I2C_SMBUS_BYTE_DATA:
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tmp_data.byte = data->byte;
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case I2C_SMBUS_BYTE:
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outb_p((addr << 1) | read_write,
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SMBHSTADD);
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outb_p(command, SMBHSTIDX);
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if (read_write == I2C_SMBUS_WRITE) {
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outb_p(tmp_data.byte, SMBHSTDAT);
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outb_p(NCT6793D_WRITE_BYTE, SMBHSTCMD);
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}
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else {
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outb_p(NCT6793D_READ_BYTE, SMBHSTCMD);
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}
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break;
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case I2C_SMBUS_WORD_DATA:
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outb_p((addr << 1) | read_write,
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SMBHSTADD);
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outb_p(command, SMBHSTIDX);
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if (read_write == I2C_SMBUS_WRITE) {
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outb_p(data->word & 0xff, SMBHSTDAT);
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outb_p((data->word & 0xff00) >> 8, SMBHSTDAT);
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outb_p(NCT6793D_WRITE_WORD, SMBHSTCMD);
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}
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else {
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outb_p(NCT6793D_READ_WORD, SMBHSTCMD);
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}
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break;
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case I2C_SMBUS_BLOCK_DATA:
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outb_p((addr << 1) | read_write,
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SMBHSTADD);
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outb_p(command, SMBHSTIDX);
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if (read_write == I2C_SMBUS_WRITE) {
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len = data->block[0];
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if (len == 0 || len > I2C_SMBUS_BLOCK_MAX)
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return -EINVAL;
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outb_p(len, SMBBLKSZ);
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cnt = 1;
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if (len >= 4) {
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for (i = cnt; i <= 4; i++) {
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outb_p(data->block[i], SMBHSTDAT);
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}
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len -= 4;
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cnt += 4;
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}
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else {
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for (i = cnt; i <= len; i++ ) {
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outb_p(data->block[i], SMBHSTDAT);
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}
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len = 0;
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}
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outb_p(NCT6793D_WRITE_BLOCK, SMBHSTCMD);
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}
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else {
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return -ENOTSUPP;
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}
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break;
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default:
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dev_warn(&adap->dev, "Unsupported transaction %d\n", size);
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return -EOPNOTSUPP;
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}
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outb_p(NCT6793D_MANUAL_START, SMBHSTCTL);
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while ((size == I2C_SMBUS_BLOCK_DATA) && (len > 0)) {
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if (read_write == I2C_SMBUS_WRITE) {
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timeout = 0;
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while ((inb_p(SMBHSTSTS) & NCT6793D_FIFO_EMPTY) == 0)
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{
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if(timeout > MAX_RETRIES)
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{
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return -ETIMEDOUT;
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}
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usleep_range(250, 500);
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timeout++;
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}
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//Load more bytes into FIFO
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if (len >= 4) {
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for (i = cnt; i <= (cnt + 4); i++) {
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outb_p(data->block[i], SMBHSTDAT);
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}
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len -= 4;
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cnt += 4;
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}
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else {
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for (i = cnt; i <= (cnt + len); i++) {
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outb_p(data->block[i], SMBHSTDAT);
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}
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len = 0;
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}
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}
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else {
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return -ENOTSUPP;
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}
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}
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//wait for manual mode to complete
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timeout = 0;
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while ((inb_p(SMBHSTSTS) & NCT6793D_MANUAL_ACTIVE) != 0)
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{
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if(timeout > MAX_RETRIES)
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{
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return -ETIMEDOUT;
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}
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usleep_range(250, 500);
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timeout++;
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}
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if ((inb_p(SMBHSTERR) & NCT6793D_NO_ACK) != 0) {
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return -ENXIO;
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}
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else if ((read_write == I2C_SMBUS_WRITE) || (size == I2C_SMBUS_QUICK)) {
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return 0;
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}
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switch (size) {
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case I2C_SMBUS_QUICK:
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case I2C_SMBUS_BYTE_DATA:
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data->byte = inb_p(SMBHSTDAT);
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break;
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case I2C_SMBUS_WORD_DATA:
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data->word = inb_p(SMBHSTDAT) + (inb_p(SMBHSTDAT) << 8);
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break;
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}
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return 0;
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}
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static u32 nct6775_func(struct i2c_adapter *adapter)
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{
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return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
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I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
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I2C_FUNC_SMBUS_BLOCK_DATA;
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}
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static const struct i2c_algorithm smbus_algorithm = {
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.smbus_xfer = nct6775_access,
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.functionality = nct6775_func,
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};
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static int nct6775_add_adapter(unsigned short smba, const char *name, struct i2c_adapter **padap)
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{
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struct i2c_adapter *adap;
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struct i2c_nct6775_adapdata *adapdata;
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int retval;
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adap = kzalloc(sizeof(*adap), GFP_KERNEL);
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if (adap == NULL) {
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return -ENOMEM;
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}
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adap->owner = THIS_MODULE;
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adap->class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
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adap->algo = &smbus_algorithm;
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adapdata = kzalloc(sizeof(*adapdata), GFP_KERNEL);
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if (adapdata == NULL) {
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kfree(adap);
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return -ENOMEM;
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}
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adapdata->smba = smba;
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snprintf(adap->name, sizeof(adap->name),
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"SMBus NCT67xx adapter%s at %04x", name, smba);
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i2c_set_adapdata(adap, adapdata);
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retval = i2c_add_adapter(adap);
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if (retval) {
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kfree(adapdata);
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kfree(adap);
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return retval;
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}
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*padap = adap;
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return 0;
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}
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static void nct6775_remove_adapter(struct i2c_adapter *adap)
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{
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struct i2c_nct6775_adapdata *adapdata = i2c_get_adapdata(adap);
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if (adapdata->smba) {
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i2c_del_adapter(adap);
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kfree(adapdata);
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kfree(adap);
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}
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}
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//static SIMPLE_DEV_PM_OPS(nct6775_dev_pm_ops, nct6775_suspend, nct6775_resume);
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/*
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* when Super-I/O functions move to a separate file, the Super-I/O
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* bus will manage the lifetime of the device and this module will only keep
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* track of the nct6775 driver. But since we use platform_device_alloc(), we
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* must keep track of the device
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*/
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static struct platform_device *pdev[2];
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static int nct6775_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct nct6775_sio_data *sio_data = dev_get_platdata(dev);
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struct resource *res;
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res = platform_get_resource(pdev, IORESOURCE_IO, 0);
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if (!devm_request_region(&pdev->dev, res->start, IOREGION_LENGTH,
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DRVNAME))
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return -EBUSY;
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switch (sio_data->kind) {
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case nct6791:
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case nct6792:
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case nct6793:
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case nct6795:
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case nct6796:
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case nct6798:
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nct6775_add_adapter(res->start, "", &nct6775_adapter);
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break;
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default:
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return -ENODEV;
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}
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return 0;
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}
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/*
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static void nct6791_enable_io_mapping(int sioaddr)
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{
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int val;
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val = superio_inb(sioaddr, NCT6791_REG_HM_IO_SPACE_LOCK_ENABLE);
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if (val & 0x10) {
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pr_info("Enabling hardware monitor logical device mappings.\n");
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superio_outb(sioaddr, NCT6791_REG_HM_IO_SPACE_LOCK_ENABLE,
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val & ~0x10);
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}
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}*/
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static struct platform_driver i2c_nct6775_driver = {
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.driver = {
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.name = DRVNAME,
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// .pm = &nct6775_dev_pm_ops,
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},
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.probe = nct6775_probe,
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};
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static void __exit i2c_nct6775_exit(void)
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{
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int i;
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if(nct6775_adapter)
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nct6775_remove_adapter(nct6775_adapter);
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for (i = 0; i < ARRAY_SIZE(pdev); i++) {
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if (pdev[i])
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platform_device_unregister(pdev[i]);
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}
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platform_driver_unregister(&i2c_nct6775_driver);
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}
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/* nct6775_find() looks for a '627 in the Super-I/O config space */
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static int __init nct6775_find(int sioaddr, struct nct6775_sio_data *sio_data)
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{
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u16 val;
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int err;
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int addr;
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err = superio_enter(sioaddr);
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if (err)
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return err;
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val = (superio_inb(sioaddr, SIO_REG_DEVID) << 8) |
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superio_inb(sioaddr, SIO_REG_DEVID + 1);
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switch (val & SIO_ID_MASK) {
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case SIO_NCT6106_ID:
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sio_data->kind = nct6106;
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break;
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case SIO_NCT6775_ID:
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sio_data->kind = nct6775;
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break;
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case SIO_NCT6776_ID:
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sio_data->kind = nct6776;
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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);
|