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linux-zen-desktop/drivers/misc/eeprom/idt_89hpesx.c

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Initial commit
2023-08-30 17:31:07 +02:00
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2016 T-Platforms. All Rights Reserved.
*
* IDT PCIe-switch NTB Linux driver
*
* Contact Information:
* Serge Semin <fancer.lancer@gmail.com>, <Sergey.Semin@t-platforms.ru>
*/
/*
* NOTE of the IDT 89HPESx SMBus-slave interface driver
* This driver primarily is developed to have an access to EEPROM device of
* IDT PCIe-switches. IDT provides a simple SMBus interface to perform IO-
* operations from/to EEPROM, which is located at private (so called Master)
* SMBus of switches. Using that interface this the driver creates a simple
* binary sysfs-file in the device directory:
* /sys/bus/i2c/devices/<bus>-<devaddr>/eeprom
* In case if read-only flag is specified in the dts-node of device desription,
* User-space applications won't be able to write to the EEPROM sysfs-node.
* Additionally IDT 89HPESx SMBus interface has an ability to write/read
* data of device CSRs. This driver exposes debugf-file to perform simple IO
* operations using that ability for just basic debug purpose. Particularly
* next file is created in the specific debugfs-directory:
* /sys/kernel/debug/idt_csr/
* Format of the debugfs-node is:
* $ cat /sys/kernel/debug/idt_csr/<bus>-<devaddr>/<devname>;
* <CSR address>:<CSR value>
* So reading the content of the file gives current CSR address and it value.
* If User-space application wishes to change current CSR address,
* it can just write a proper value to the sysfs-file:
* $ echo "<CSR address>" > /sys/kernel/debug/idt_csr/<bus>-<devaddr>/<devname>
* If it wants to change the CSR value as well, the format of the write
* operation is:
* $ echo "<CSR address>:<CSR value>" > \
* /sys/kernel/debug/idt_csr/<bus>-<devaddr>/<devname>;
* CSR address and value can be any of hexadecimal, decimal or octal format.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/sizes.h>
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/sysfs.h>
#include <linux/debugfs.h>
#include <linux/mod_devicetable.h>
#include <linux/property.h>
#include <linux/i2c.h>
#include <linux/pci_ids.h>
#include <linux/delay.h>
#define IDT_NAME "89hpesx"
#define IDT_89HPESX_DESC "IDT 89HPESx SMBus-slave interface driver"
#define IDT_89HPESX_VER "1.0"
MODULE_DESCRIPTION(IDT_89HPESX_DESC);
MODULE_VERSION(IDT_89HPESX_VER);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("T-platforms");
/*
* csr_dbgdir - CSR read/write operations Debugfs directory
*/
static struct dentry *csr_dbgdir;
/*
* struct idt_89hpesx_dev - IDT 89HPESx device data structure
* @eesize: Size of EEPROM in bytes (calculated from "idt,eecompatible")
* @eero: EEPROM Read-only flag
* @eeaddr: EEPROM custom address
*
* @inieecmd: Initial cmd value for EEPROM read/write operations
* @inicsrcmd: Initial cmd value for CSR read/write operations
* @iniccode: Initialial command code value for IO-operations
*
* @csr: CSR address to perform read operation
*
* @smb_write: SMBus write method
* @smb_read: SMBus read method
* @smb_mtx: SMBus mutex
*
* @client: i2c client used to perform IO operations
*
* @ee_file: EEPROM read/write sysfs-file
*/
struct idt_smb_seq;
struct idt_89hpesx_dev {
u32 eesize;
bool eero;
u8 eeaddr;
u8 inieecmd;
u8 inicsrcmd;
u8 iniccode;
u16 csr;
int (*smb_write)(struct idt_89hpesx_dev *, const struct idt_smb_seq *);
int (*smb_read)(struct idt_89hpesx_dev *, struct idt_smb_seq *);
struct mutex smb_mtx;
struct i2c_client *client;
struct bin_attribute *ee_file;
struct dentry *csr_dir;
};
/*
* struct idt_smb_seq - sequence of data to be read/written from/to IDT 89HPESx
* @ccode: SMBus command code
* @bytecnt: Byte count of operation
* @data: Data to by written
*/
struct idt_smb_seq {
u8 ccode;
u8 bytecnt;
u8 *data;
};
/*
* struct idt_eeprom_seq - sequence of data to be read/written from/to EEPROM
* @cmd: Transaction CMD
* @eeaddr: EEPROM custom address
* @memaddr: Internal memory address of EEPROM
* @data: Data to be written at the memory address
*/
struct idt_eeprom_seq {
u8 cmd;
u8 eeaddr;
u16 memaddr;
u8 data;
} __packed;
/*
* struct idt_csr_seq - sequence of data to be read/written from/to CSR
* @cmd: Transaction CMD
* @csraddr: Internal IDT device CSR address
* @data: Data to be read/written from/to the CSR address
*/
struct idt_csr_seq {
u8 cmd;
u16 csraddr;
u32 data;
} __packed;
/*
* SMBus command code macros
* @CCODE_END: Indicates the end of transaction
* @CCODE_START: Indicates the start of transaction
* @CCODE_CSR: CSR read/write transaction
* @CCODE_EEPROM: EEPROM read/write transaction
* @CCODE_BYTE: Supplied data has BYTE length
* @CCODE_WORD: Supplied data has WORD length
* @CCODE_BLOCK: Supplied data has variable length passed in bytecnt
* byte right following CCODE byte
*/
#define CCODE_END ((u8)0x01)
#define CCODE_START ((u8)0x02)
#define CCODE_CSR ((u8)0x00)
#define CCODE_EEPROM ((u8)0x04)
#define CCODE_BYTE ((u8)0x00)
#define CCODE_WORD ((u8)0x20)
#define CCODE_BLOCK ((u8)0x40)
#define CCODE_PEC ((u8)0x80)
/*
* EEPROM command macros
* @EEPROM_OP_WRITE: EEPROM write operation
* @EEPROM_OP_READ: EEPROM read operation
* @EEPROM_USA: Use specified address of EEPROM
* @EEPROM_NAERR: EEPROM device is not ready to respond
* @EEPROM_LAERR: EEPROM arbitration loss error
* @EEPROM_MSS: EEPROM misplace start & stop bits error
* @EEPROM_WR_CNT: Bytes count to perform write operation
* @EEPROM_WRRD_CNT: Bytes count to write before reading
* @EEPROM_RD_CNT: Bytes count to perform read operation
* @EEPROM_DEF_SIZE: Fall back size of EEPROM
* @EEPROM_DEF_ADDR: Defatul EEPROM address
* @EEPROM_TOUT: Timeout before retry read operation if eeprom is busy
*/
#define EEPROM_OP_WRITE ((u8)0x00)
#define EEPROM_OP_READ ((u8)0x01)
#define EEPROM_USA ((u8)0x02)
#define EEPROM_NAERR ((u8)0x08)
#define EEPROM_LAERR ((u8)0x10)
#define EEPROM_MSS ((u8)0x20)
#define EEPROM_WR_CNT ((u8)5)
#define EEPROM_WRRD_CNT ((u8)4)
#define EEPROM_RD_CNT ((u8)5)
#define EEPROM_DEF_SIZE ((u16)4096)
#define EEPROM_DEF_ADDR ((u8)0x50)
#define EEPROM_TOUT (100)
/*
* CSR command macros
* @CSR_DWE: Enable all four bytes of the operation
* @CSR_OP_WRITE: CSR write operation
* @CSR_OP_READ: CSR read operation
* @CSR_RERR: Read operation error
* @CSR_WERR: Write operation error
* @CSR_WR_CNT: Bytes count to perform write operation
* @CSR_WRRD_CNT: Bytes count to write before reading
* @CSR_RD_CNT: Bytes count to perform read operation
* @CSR_MAX: Maximum CSR address
* @CSR_DEF: Default CSR address
* @CSR_REAL_ADDR: CSR real unshifted address
*/
#define CSR_DWE ((u8)0x0F)
#define CSR_OP_WRITE ((u8)0x00)
#define CSR_OP_READ ((u8)0x10)
#define CSR_RERR ((u8)0x40)
#define CSR_WERR ((u8)0x80)
#define CSR_WR_CNT ((u8)7)
#define CSR_WRRD_CNT ((u8)3)
#define CSR_RD_CNT ((u8)7)
#define CSR_MAX ((u32)0x3FFFF)
#define CSR_DEF ((u16)0x0000)
#define CSR_REAL_ADDR(val) ((unsigned int)val << 2)
/*
* IDT 89HPESx basic register
* @IDT_VIDDID_CSR: PCIe VID and DID of IDT 89HPESx
* @IDT_VID_MASK: Mask of VID
*/
#define IDT_VIDDID_CSR ((u32)0x0000)
#define IDT_VID_MASK ((u32)0xFFFF)
/*
* IDT 89HPESx can send NACK when new command is sent before previous one
* fininshed execution. In this case driver retries operation
* certain times.
* @RETRY_CNT: Number of retries before giving up and fail
* @idt_smb_safe: Generate a retry loop on corresponding SMBus method
*/
#define RETRY_CNT (128)
#define idt_smb_safe(ops, args...) ({ \
int __retry = RETRY_CNT; \
s32 __sts; \
do { \
__sts = i2c_smbus_ ## ops ## _data(args); \
} while (__retry-- && __sts < 0); \
__sts; \
})
/*===========================================================================
* i2c bus level IO-operations
*===========================================================================
*/
/*
* idt_smb_write_byte() - SMBus write method when I2C_SMBUS_BYTE_DATA operation
* is only available
* @pdev: Pointer to the driver data
* @seq: Sequence of data to be written
*/
static int idt_smb_write_byte(struct idt_89hpesx_dev *pdev,
const struct idt_smb_seq *seq)
{
s32 sts;
u8 ccode;
int idx;
/* Loop over the supplied data sending byte one-by-one */
for (idx = 0; idx < seq->bytecnt; idx++) {
/* Collect the command code byte */
ccode = seq->ccode | CCODE_BYTE;
if (idx == 0)
ccode |= CCODE_START;
if (idx == seq->bytecnt - 1)
ccode |= CCODE_END;
/* Send data to the device */
sts = idt_smb_safe(write_byte, pdev->client, ccode,
seq->data[idx]);
if (sts != 0)
return (int)sts;
}
return 0;
}
/*
* idt_smb_read_byte() - SMBus read method when I2C_SMBUS_BYTE_DATA operation
* is only available
* @pdev: Pointer to the driver data
* @seq: Buffer to read data to
*/
static int idt_smb_read_byte(struct idt_89hpesx_dev *pdev,
struct idt_smb_seq *seq)
{
s32 sts;
u8 ccode;
int idx;
/* Loop over the supplied buffer receiving byte one-by-one */
for (idx = 0; idx < seq->bytecnt; idx++) {
/* Collect the command code byte */
ccode = seq->ccode | CCODE_BYTE;
if (idx == 0)
ccode |= CCODE_START;
if (idx == seq->bytecnt - 1)
ccode |= CCODE_END;
/* Read data from the device */
sts = idt_smb_safe(read_byte, pdev->client, ccode);
if (sts < 0)
return (int)sts;
seq->data[idx] = (u8)sts;
}
return 0;
}
/*
* idt_smb_write_word() - SMBus write method when I2C_SMBUS_BYTE_DATA and
* I2C_FUNC_SMBUS_WORD_DATA operations are available
* @pdev: Pointer to the driver data
* @seq: Sequence of data to be written
*/
static int idt_smb_write_word(struct idt_89hpesx_dev *pdev,
const struct idt_smb_seq *seq)
{
s32 sts;
u8 ccode;
int idx, evencnt;
/* Calculate the even count of data to send */
evencnt = seq->bytecnt - (seq->bytecnt % 2);
/* Loop over the supplied data sending two bytes at a time */
for (idx = 0; idx < evencnt; idx += 2) {
/* Collect the command code byte */
ccode = seq->ccode | CCODE_WORD;
if (idx == 0)
ccode |= CCODE_START;
if (idx == evencnt - 2)
ccode |= CCODE_END;
/* Send word data to the device */
sts = idt_smb_safe(write_word, pdev->client, ccode,
*(u16 *)&seq->data[idx]);
if (sts != 0)
return (int)sts;
}
/* If there is odd number of bytes then send just one last byte */
if (seq->bytecnt != evencnt) {
/* Collect the command code byte */
ccode = seq->ccode | CCODE_BYTE | CCODE_END;
if (idx == 0)
ccode |= CCODE_START;
/* Send byte data to the device */
sts = idt_smb_safe(write_byte, pdev->client, ccode,
seq->data[idx]);
if (sts != 0)
return (int)sts;
}
return 0;
}
/*
* idt_smb_read_word() - SMBus read method when I2C_SMBUS_BYTE_DATA and
* I2C_FUNC_SMBUS_WORD_DATA operations are available
* @pdev: Pointer to the driver data
* @seq: Buffer to read data to
*/
static int idt_smb_read_word(struct idt_89hpesx_dev *pdev,
struct idt_smb_seq *seq)
{
s32 sts;
u8 ccode;
int idx, evencnt;
/* Calculate the even count of data to send */
evencnt = seq->bytecnt - (seq->bytecnt % 2);
/* Loop over the supplied data reading two bytes at a time */
for (idx = 0; idx < evencnt; idx += 2) {
/* Collect the command code byte */
ccode = seq->ccode | CCODE_WORD;
if (idx == 0)
ccode |= CCODE_START;
if (idx == evencnt - 2)
ccode |= CCODE_END;
/* Read word data from the device */
sts = idt_smb_safe(read_word, pdev->client, ccode);
if (sts < 0)
return (int)sts;
*(u16 *)&seq->data[idx] = (u16)sts;
}
/* If there is odd number of bytes then receive just one last byte */
if (seq->bytecnt != evencnt) {
/* Collect the command code byte */
ccode = seq->ccode | CCODE_BYTE | CCODE_END;
if (idx == 0)
ccode |= CCODE_START;
/* Read last data byte from the device */
sts = idt_smb_safe(read_byte, pdev->client, ccode);
if (sts < 0)
return (int)sts;
seq->data[idx] = (u8)sts;
}
return 0;
}
/*
* idt_smb_write_block() - SMBus write method when I2C_SMBUS_BLOCK_DATA
* operation is available
* @pdev: Pointer to the driver data
* @seq: Sequence of data to be written
*/
static int idt_smb_write_block(struct idt_89hpesx_dev *pdev,
const struct idt_smb_seq *seq)
{
u8 ccode;
/* Return error if too much data passed to send */
if (seq->bytecnt > I2C_SMBUS_BLOCK_MAX)
return -EINVAL;
/* Collect the command code byte */
ccode = seq->ccode | CCODE_BLOCK | CCODE_START | CCODE_END;
/* Send block of data to the device */
return idt_smb_safe(write_block, pdev->client, ccode, seq->bytecnt,
seq->data);
}
/*
* idt_smb_read_block() - SMBus read method when I2C_SMBUS_BLOCK_DATA
* operation is available
* @pdev: Pointer to the driver data
* @seq: Buffer to read data to
*/
static int idt_smb_read_block(struct idt_89hpesx_dev *pdev,
struct idt_smb_seq *seq)
{
s32 sts;
u8 ccode;
/* Return error if too much data passed to send */
if (seq->bytecnt > I2C_SMBUS_BLOCK_MAX)
return -EINVAL;
/* Collect the command code byte */
ccode = seq->ccode | CCODE_BLOCK | CCODE_START | CCODE_END;
/* Read block of data from the device */
sts = idt_smb_safe(read_block, pdev->client, ccode, seq->data);
if (sts != seq->bytecnt)
return (sts < 0 ? sts : -ENODATA);
return 0;
}
/*
* idt_smb_write_i2c_block() - SMBus write method when I2C_SMBUS_I2C_BLOCK_DATA
* operation is available
* @pdev: Pointer to the driver data
* @seq: Sequence of data to be written
*
* NOTE It's usual SMBus write block operation, except the actual data length is
* sent as first byte of data
*/
static int idt_smb_write_i2c_block(struct idt_89hpesx_dev *pdev,
const struct idt_smb_seq *seq)
{
u8 ccode, buf[I2C_SMBUS_BLOCK_MAX + 1];
/* Return error if too much data passed to send */
if (seq->bytecnt > I2C_SMBUS_BLOCK_MAX)
return -EINVAL;
/* Collect the data to send. Length byte must be added prior the data */
buf[0] = seq->bytecnt;
memcpy(&buf[1], seq->data, seq->bytecnt);
/* Collect the command code byte */
ccode = seq->ccode | CCODE_BLOCK | CCODE_START | CCODE_END;
/* Send length and block of data to the device */
return idt_smb_safe(write_i2c_block, pdev->client, ccode,
seq->bytecnt + 1, buf);
}
/*
* idt_smb_read_i2c_block() - SMBus read method when I2C_SMBUS_I2C_BLOCK_DATA
* operation is available
* @pdev: Pointer to the driver data
* @seq: Buffer to read data to
*
* NOTE It's usual SMBus read block operation, except the actual data length is
* retrieved as first byte of data
*/
static int idt_smb_read_i2c_block(struct idt_89hpesx_dev *pdev,
struct idt_smb_seq *seq)
{
u8 ccode, buf[I2C_SMBUS_BLOCK_MAX + 1];
s32 sts;
/* Return error if too much data passed to send */
if (seq->bytecnt > I2C_SMBUS_BLOCK_MAX)
return -EINVAL;
/* Collect the command code byte */
ccode = seq->ccode | CCODE_BLOCK | CCODE_START | CCODE_END;
/* Read length and block of data from the device */
sts = idt_smb_safe(read_i2c_block, pdev->client, ccode,
seq->bytecnt + 1, buf);
if (sts != seq->bytecnt + 1)
return (sts < 0 ? sts : -ENODATA);
if (buf[0] != seq->bytecnt)
return -ENODATA;
/* Copy retrieved data to the output data buffer */
memcpy(seq->data, &buf[1], seq->bytecnt);
return 0;
}
/*===========================================================================
* EEPROM IO-operations
*===========================================================================
*/
/*
* idt_eeprom_read_byte() - read just one byte from EEPROM
* @pdev: Pointer to the driver data
* @memaddr: Start EEPROM memory address
* @data: Data to be written to EEPROM
*/
static int idt_eeprom_read_byte(struct idt_89hpesx_dev *pdev, u16 memaddr,
u8 *data)
{
struct device *dev = &pdev->client->dev;
struct idt_eeprom_seq eeseq;
struct idt_smb_seq smbseq;
int ret, retry;
/* Initialize SMBus sequence fields */
smbseq.ccode = pdev->iniccode | CCODE_EEPROM;
smbseq.data = (u8 *)&eeseq;
/*
* Sometimes EEPROM may respond with NACK if it's busy with previous
* operation, so we need to perform a few attempts of read cycle
*/
retry = RETRY_CNT;
do {
/* Send EEPROM memory address to read data from */
smbseq.bytecnt = EEPROM_WRRD_CNT;
eeseq.cmd = pdev->inieecmd | EEPROM_OP_READ;
eeseq.eeaddr = pdev->eeaddr;
eeseq.memaddr = cpu_to_le16(memaddr);
ret = pdev->smb_write(pdev, &smbseq);
if (ret != 0) {
dev_err(dev, "Failed to init eeprom addr 0x%02x",
memaddr);
break;
}
/* Perform read operation */
smbseq.bytecnt = EEPROM_RD_CNT;
ret = pdev->smb_read(pdev, &smbseq);
if (ret != 0) {
dev_err(dev, "Failed to read eeprom data 0x%02x",
memaddr);
break;
}
/* Restart read operation if the device is busy */
if (retry && (eeseq.cmd & EEPROM_NAERR)) {
dev_dbg(dev, "EEPROM busy, retry reading after %d ms",
EEPROM_TOUT);
msleep(EEPROM_TOUT);
continue;
}
/* Check whether IDT successfully read data from EEPROM */
if (eeseq.cmd & (EEPROM_NAERR | EEPROM_LAERR | EEPROM_MSS)) {
dev_err(dev,
"Communication with eeprom failed, cmd 0x%hhx",
eeseq.cmd);
ret = -EREMOTEIO;
break;
}
/* Save retrieved data and exit the loop */
*data = eeseq.data;
break;
} while (retry--);
/* Return the status of operation */
return ret;
}
/*
* idt_eeprom_write() - EEPROM write operation
* @pdev: Pointer to the driver data
* @memaddr: Start EEPROM memory address
* @len: Length of data to be written
* @data: Data to be written to EEPROM
*/
static int idt_eeprom_write(struct idt_89hpesx_dev *pdev, u16 memaddr, u16 len,
const u8 *data)
{
struct device *dev = &pdev->client->dev;
struct idt_eeprom_seq eeseq;
struct idt_smb_seq smbseq;
int ret;
u16 idx;
/* Initialize SMBus sequence fields */
smbseq.ccode = pdev->iniccode | CCODE_EEPROM;
smbseq.data = (u8 *)&eeseq;
/* Send data byte-by-byte, checking if it is successfully written */
for (idx = 0; idx < len; idx++, memaddr++) {
/* Lock IDT SMBus device */
mutex_lock(&pdev->smb_mtx);
/* Perform write operation */
smbseq.bytecnt = EEPROM_WR_CNT;
eeseq.cmd = pdev->inieecmd | EEPROM_OP_WRITE;
eeseq.eeaddr = pdev->eeaddr;
eeseq.memaddr = cpu_to_le16(memaddr);
eeseq.data = data[idx];
ret = pdev->smb_write(pdev, &smbseq);
if (ret != 0) {
dev_err(dev,
"Failed to write 0x%04hx:0x%02hhx to eeprom",
memaddr, data[idx]);
goto err_mutex_unlock;
}
/*
* Check whether the data is successfully written by reading
* from the same EEPROM memory address.
*/
eeseq.data = ~data[idx];
ret = idt_eeprom_read_byte(pdev, memaddr, &eeseq.data);
if (ret != 0)
goto err_mutex_unlock;
/* Check whether the read byte is the same as written one */
if (eeseq.data != data[idx]) {
dev_err(dev, "Values don't match 0x%02hhx != 0x%02hhx",
eeseq.data, data[idx]);
ret = -EREMOTEIO;
goto err_mutex_unlock;
}
/* Unlock IDT SMBus device */
err_mutex_unlock:
mutex_unlock(&pdev->smb_mtx);
if (ret != 0)
return ret;
}
return 0;
}
/*
* idt_eeprom_read() - EEPROM read operation
* @pdev: Pointer to the driver data
* @memaddr: Start EEPROM memory address
* @len: Length of data to read
* @buf: Buffer to read data to
*/
static int idt_eeprom_read(struct idt_89hpesx_dev *pdev, u16 memaddr, u16 len,
u8 *buf)
{
int ret;
u16 idx;
/* Read data byte-by-byte, retrying if it wasn't successful */
for (idx = 0; idx < len; idx++, memaddr++) {
/* Lock IDT SMBus device */
mutex_lock(&pdev->smb_mtx);
/* Just read the byte to the buffer */
ret = idt_eeprom_read_byte(pdev, memaddr, &buf[idx]);
/* Unlock IDT SMBus device */
mutex_unlock(&pdev->smb_mtx);
/* Return error if read operation failed */
if (ret != 0)
return ret;
}
return 0;
}
/*===========================================================================
* CSR IO-operations
*===========================================================================
*/
/*
* idt_csr_write() - CSR write operation
* @pdev: Pointer to the driver data
* @csraddr: CSR address (with no two LS bits)
* @data: Data to be written to CSR
*/
static int idt_csr_write(struct idt_89hpesx_dev *pdev, u16 csraddr,
const u32 data)
{
struct device *dev = &pdev->client->dev;
struct idt_csr_seq csrseq;
struct idt_smb_seq smbseq;
int ret;
/* Initialize SMBus sequence fields */
smbseq.ccode = pdev->iniccode | CCODE_CSR;
smbseq.data = (u8 *)&csrseq;
/* Lock IDT SMBus device */
mutex_lock(&pdev->smb_mtx);
/* Perform write operation */
smbseq.bytecnt = CSR_WR_CNT;
csrseq.cmd = pdev->inicsrcmd | CSR_OP_WRITE;
csrseq.csraddr = cpu_to_le16(csraddr);
csrseq.data = cpu_to_le32(data);
ret = pdev->smb_write(pdev, &smbseq);
if (ret != 0) {
dev_err(dev, "Failed to write 0x%04x: 0x%04x to csr",
CSR_REAL_ADDR(csraddr), data);
goto err_mutex_unlock;
}
/* Send CSR address to read data from */
smbseq.bytecnt = CSR_WRRD_CNT;
csrseq.cmd = pdev->inicsrcmd | CSR_OP_READ;
ret = pdev->smb_write(pdev, &smbseq);
if (ret != 0) {
dev_err(dev, "Failed to init csr address 0x%04x",
CSR_REAL_ADDR(csraddr));
goto err_mutex_unlock;
}
/* Perform read operation */
smbseq.bytecnt = CSR_RD_CNT;
ret = pdev->smb_read(pdev, &smbseq);
if (ret != 0) {
dev_err(dev, "Failed to read csr 0x%04x",
CSR_REAL_ADDR(csraddr));
goto err_mutex_unlock;
}
/* Check whether IDT successfully retrieved CSR data */
if (csrseq.cmd & (CSR_RERR | CSR_WERR)) {
dev_err(dev, "IDT failed to perform CSR r/w");
ret = -EREMOTEIO;
goto err_mutex_unlock;
}
/* Unlock IDT SMBus device */
err_mutex_unlock:
mutex_unlock(&pdev->smb_mtx);
return ret;
}
/*
* idt_csr_read() - CSR read operation
* @pdev: Pointer to the driver data
* @csraddr: CSR address (with no two LS bits)
* @data: Data to be written to CSR
*/
static int idt_csr_read(struct idt_89hpesx_dev *pdev, u16 csraddr, u32 *data)
{
struct device *dev = &pdev->client->dev;
struct idt_csr_seq csrseq;
struct idt_smb_seq smbseq;
int ret;
/* Initialize SMBus sequence fields */
smbseq.ccode = pdev->iniccode | CCODE_CSR;
smbseq.data = (u8 *)&csrseq;
/* Lock IDT SMBus device */
mutex_lock(&pdev->smb_mtx);
/* Send CSR register address before reading it */
smbseq.bytecnt = CSR_WRRD_CNT;
csrseq.cmd = pdev->inicsrcmd | CSR_OP_READ;
csrseq.csraddr = cpu_to_le16(csraddr);
ret = pdev->smb_write(pdev, &smbseq);
if (ret != 0) {
dev_err(dev, "Failed to init csr address 0x%04x",
CSR_REAL_ADDR(csraddr));
goto err_mutex_unlock;
}
/* Perform read operation */
smbseq.bytecnt = CSR_RD_CNT;
ret = pdev->smb_read(pdev, &smbseq);
if (ret != 0) {
dev_err(dev, "Failed to read csr 0x%04x",
CSR_REAL_ADDR(csraddr));
goto err_mutex_unlock;
}
/* Check whether IDT successfully retrieved CSR data */
if (csrseq.cmd & (CSR_RERR | CSR_WERR)) {
dev_err(dev, "IDT failed to perform CSR r/w");
ret = -EREMOTEIO;
goto err_mutex_unlock;
}
/* Save data retrieved from IDT */
*data = le32_to_cpu(csrseq.data);
/* Unlock IDT SMBus device */
err_mutex_unlock:
mutex_unlock(&pdev->smb_mtx);
return ret;
}
/*===========================================================================
* Sysfs/debugfs-nodes IO-operations
*===========================================================================
*/
/*
* eeprom_write() - EEPROM sysfs-node write callback
* @filep: Pointer to the file system node
* @kobj: Pointer to the kernel object related to the sysfs-node
* @attr: Attributes of the file
* @buf: Buffer to write data to
* @off: Offset at which data should be written to
* @count: Number of bytes to write
*/
static ssize_t eeprom_write(struct file *filp, struct kobject *kobj,
struct bin_attribute *attr,
char *buf, loff_t off, size_t count)
{
struct idt_89hpesx_dev *pdev;
int ret;
/* Retrieve driver data */
pdev = dev_get_drvdata(kobj_to_dev(kobj));
/* Perform EEPROM write operation */
ret = idt_eeprom_write(pdev, (u16)off, (u16)count, (u8 *)buf);
return (ret != 0 ? ret : count);
}
/*
* eeprom_read() - EEPROM sysfs-node read callback
* @filep: Pointer to the file system node
* @kobj: Pointer to the kernel object related to the sysfs-node
* @attr: Attributes of the file
* @buf: Buffer to write data to
* @off: Offset at which data should be written to
* @count: Number of bytes to write
*/
static ssize_t eeprom_read(struct file *filp, struct kobject *kobj,
struct bin_attribute *attr,
char *buf, loff_t off, size_t count)
{
struct idt_89hpesx_dev *pdev;
int ret;
/* Retrieve driver data */
pdev = dev_get_drvdata(kobj_to_dev(kobj));
/* Perform EEPROM read operation */
ret = idt_eeprom_read(pdev, (u16)off, (u16)count, (u8 *)buf);
return (ret != 0 ? ret : count);
}
/*
* idt_dbgfs_csr_write() - CSR debugfs-node write callback
* @filep: Pointer to the file system file descriptor
* @buf: Buffer to read data from
* @count: Size of the buffer
* @offp: Offset within the file
*
* It accepts either "0x<reg addr>:0x<value>" for saving register address
* and writing value to specified DWORD register or "0x<reg addr>" for
* just saving register address in order to perform next read operation.
*
* WARNING No spaces are allowed. Incoming string must be strictly formated as:
* "<reg addr>:<value>". Register address must be aligned within 4 bytes
* (one DWORD).
*/
static ssize_t idt_dbgfs_csr_write(struct file *filep, const char __user *ubuf,
size_t count, loff_t *offp)
{
struct idt_89hpesx_dev *pdev = filep->private_data;
char *colon_ch, *csraddr_str, *csrval_str;
int ret, csraddr_len;
u32 csraddr, csrval;
char *buf;
if (*offp)
return 0;
/* Copy data from User-space */
buf = kmalloc(count + 1, GFP_KERNEL);
if (!buf)
return -ENOMEM;
if (copy_from_user(buf, ubuf, count)) {
ret = -EFAULT;
goto free_buf;
}
buf[count] = 0;
/* Find position of colon in the buffer */
colon_ch = strnchr(buf, count, ':');
/*
* If there is colon passed then new CSR value should be parsed as
* well, so allocate buffer for CSR address substring.
* If no colon is found, then string must have just one number with
* no new CSR value
*/
if (colon_ch != NULL) {
csraddr_len = colon_ch - buf;
csraddr_str =
kmalloc(csraddr_len + 1, GFP_KERNEL);
if (csraddr_str == NULL) {
ret = -ENOMEM;
goto free_buf;
}
/* Copy the register address to the substring buffer */
strncpy(csraddr_str, buf, csraddr_len);
csraddr_str[csraddr_len] = '\0';
/* Register value must follow the colon */
csrval_str = colon_ch + 1;
} else /* if (str_colon == NULL) */ {
csraddr_str = (char *)buf; /* Just to shut warning up */
csraddr_len = strnlen(csraddr_str, count);
csrval_str = NULL;
}
/* Convert CSR address to u32 value */
ret = kstrtou32(csraddr_str, 0, &csraddr);
if (ret != 0)
goto free_csraddr_str;
/* Check whether passed register address is valid */
if (csraddr > CSR_MAX || !IS_ALIGNED(csraddr, SZ_4)) {
ret = -EINVAL;
goto free_csraddr_str;
}
/* Shift register address to the right so to have u16 address */
pdev->csr = (csraddr >> 2);
/* Parse new CSR value and send it to IDT, if colon has been found */
if (colon_ch != NULL) {
ret = kstrtou32(csrval_str, 0, &csrval);
if (ret != 0)
goto free_csraddr_str;
ret = idt_csr_write(pdev, pdev->csr, csrval);
if (ret != 0)
goto free_csraddr_str;
}
/* Free memory only if colon has been found */
free_csraddr_str:
if (colon_ch != NULL)
kfree(csraddr_str);
/* Free buffer allocated for data retrieved from User-space */
free_buf:
kfree(buf);
return (ret != 0 ? ret : count);
}
/*
* idt_dbgfs_csr_read() - CSR debugfs-node read callback
* @filep: Pointer to the file system file descriptor
* @buf: Buffer to write data to
* @count: Size of the buffer
* @offp: Offset within the file
*
* It just prints the pair "0x<reg addr>:0x<value>" to passed buffer.
*/
#define CSRBUF_SIZE ((size_t)32)
static ssize_t idt_dbgfs_csr_read(struct file *filep, char __user *ubuf,
size_t count, loff_t *offp)
{
struct idt_89hpesx_dev *pdev = filep->private_data;
u32 csraddr, csrval;
char buf[CSRBUF_SIZE];
int ret, size;
/* Perform CSR read operation */
ret = idt_csr_read(pdev, pdev->csr, &csrval);
if (ret != 0)
return ret;
/* Shift register address to the left so to have real address */
csraddr = ((u32)pdev->csr << 2);
/* Print the "0x<reg addr>:0x<value>" to buffer */
size = snprintf(buf, CSRBUF_SIZE, "0x%05x:0x%08x\n",
(unsigned int)csraddr, (unsigned int)csrval);
/* Copy data to User-space */
return simple_read_from_buffer(ubuf, count, offp, buf, size);
}
/*
* eeprom_attribute - EEPROM sysfs-node attributes
*
* NOTE Size will be changed in compliance with OF node. EEPROM attribute will
* be read-only as well if the corresponding flag is specified in OF node.
*/
static BIN_ATTR_RW(eeprom, EEPROM_DEF_SIZE);
/*
* csr_dbgfs_ops - CSR debugfs-node read/write operations
*/
static const struct file_operations csr_dbgfs_ops = {
.owner = THIS_MODULE,
.open = simple_open,
.write = idt_dbgfs_csr_write,
.read = idt_dbgfs_csr_read
};
/*===========================================================================
* Driver init/deinit methods
*===========================================================================
*/
/*
* idt_set_defval() - disable EEPROM access by default
* @pdev: Pointer to the driver data
*/
static void idt_set_defval(struct idt_89hpesx_dev *pdev)
{
/* If OF info is missing then use next values */
pdev->eesize = 0;
pdev->eero = true;
pdev->inieecmd = 0;
pdev->eeaddr = 0;
}
static const struct i2c_device_id ee_ids[];
/*
* idt_ee_match_id() - check whether the node belongs to compatible EEPROMs
*/
static const struct i2c_device_id *idt_ee_match_id(struct fwnode_handle *fwnode)
{
const struct i2c_device_id *id = ee_ids;
const char *compatible, *p;
char devname[I2C_NAME_SIZE];
int ret;
ret = fwnode_property_read_string(fwnode, "compatible", &compatible);
if (ret)
return NULL;
p = strchr(compatible, ',');
strscpy(devname, p ? p + 1 : compatible, sizeof(devname));
/* Search through the device name */
while (id->name[0]) {
if (strcmp(devname, id->name) == 0)
return id;
id++;
}
return NULL;
}
/*
* idt_get_fw_data() - get IDT i2c-device parameters from device tree
* @pdev: Pointer to the driver data
*/
static void idt_get_fw_data(struct idt_89hpesx_dev *pdev)
{
struct device *dev = &pdev->client->dev;
struct fwnode_handle *fwnode;
const struct i2c_device_id *ee_id = NULL;
u32 eeprom_addr;
int ret;
device_for_each_child_node(dev, fwnode) {
ee_id = idt_ee_match_id(fwnode);
if (ee_id)
break;
dev_warn(dev, "Skip unsupported EEPROM device %pfw\n", fwnode);
}
/* If there is no fwnode EEPROM device, then set zero size */
if (!ee_id) {
dev_warn(dev, "No fwnode, EEPROM access disabled");
idt_set_defval(pdev);
return;
}
/* Retrieve EEPROM size */
pdev->eesize = (u32)ee_id->driver_data;
/* Get custom EEPROM address from 'reg' attribute */
ret = fwnode_property_read_u32(fwnode, "reg", &eeprom_addr);
if (ret || (eeprom_addr == 0)) {
dev_warn(dev, "No EEPROM reg found, use default address 0x%x",
EEPROM_DEF_ADDR);
pdev->inieecmd = 0;
pdev->eeaddr = EEPROM_DEF_ADDR << 1;
} else {
pdev->inieecmd = EEPROM_USA;
pdev->eeaddr = eeprom_addr << 1;
}
/* Check EEPROM 'read-only' flag */
if (fwnode_property_read_bool(fwnode, "read-only"))
pdev->eero = true;
else /* if (!fwnode_property_read_bool(node, "read-only")) */
pdev->eero = false;
fwnode_handle_put(fwnode);
dev_info(dev, "EEPROM of %d bytes found by 0x%x",
pdev->eesize, pdev->eeaddr);
}
/*
* idt_create_pdev() - create and init data structure of the driver
* @client: i2c client of IDT PCIe-switch device
*/
static struct idt_89hpesx_dev *idt_create_pdev(struct i2c_client *client)
{
struct idt_89hpesx_dev *pdev;
/* Allocate memory for driver data */
pdev = devm_kmalloc(&client->dev, sizeof(struct idt_89hpesx_dev),
GFP_KERNEL);
if (pdev == NULL)
return ERR_PTR(-ENOMEM);
/* Initialize basic fields of the data */
pdev->client = client;
i2c_set_clientdata(client, pdev);
/* Read firmware nodes information */
idt_get_fw_data(pdev);
/* Initialize basic CSR CMD field - use full DWORD-sized r/w ops */
pdev->inicsrcmd = CSR_DWE;
pdev->csr = CSR_DEF;
/* Enable Packet Error Checking if it's supported by adapter */
if (i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_PEC)) {
pdev->iniccode = CCODE_PEC;
client->flags |= I2C_CLIENT_PEC;
} else /* PEC is unsupported */ {
pdev->iniccode = 0;
}
return pdev;
}
/*
* idt_free_pdev() - free data structure of the driver
* @pdev: Pointer to the driver data
*/
static void idt_free_pdev(struct idt_89hpesx_dev *pdev)
{
/* Clear driver data from device private field */
i2c_set_clientdata(pdev->client, NULL);
}
/*
* idt_set_smbus_ops() - set supported SMBus operations
* @pdev: Pointer to the driver data
* Return status of smbus check operations
*/
static int idt_set_smbus_ops(struct idt_89hpesx_dev *pdev)
{
struct i2c_adapter *adapter = pdev->client->adapter;
struct device *dev = &pdev->client->dev;
/* Check i2c adapter read functionality */
if (i2c_check_functionality(adapter,
I2C_FUNC_SMBUS_READ_BLOCK_DATA)) {
pdev->smb_read = idt_smb_read_block;
dev_dbg(dev, "SMBus block-read op chosen");
} else if (i2c_check_functionality(adapter,
I2C_FUNC_SMBUS_READ_I2C_BLOCK)) {
pdev->smb_read = idt_smb_read_i2c_block;
dev_dbg(dev, "SMBus i2c-block-read op chosen");
} else if (i2c_check_functionality(adapter,
I2C_FUNC_SMBUS_READ_WORD_DATA) &&
i2c_check_functionality(adapter,
I2C_FUNC_SMBUS_READ_BYTE_DATA)) {
pdev->smb_read = idt_smb_read_word;
dev_warn(dev, "Use slow word/byte SMBus read ops");
} else if (i2c_check_functionality(adapter,
I2C_FUNC_SMBUS_READ_BYTE_DATA)) {
pdev->smb_read = idt_smb_read_byte;
dev_warn(dev, "Use slow byte SMBus read op");
} else /* no supported smbus read operations */ {
dev_err(dev, "No supported SMBus read op");
return -EPFNOSUPPORT;
}
/* Check i2c adapter write functionality */
if (i2c_check_functionality(adapter,
I2C_FUNC_SMBUS_WRITE_BLOCK_DATA)) {
pdev->smb_write = idt_smb_write_block;
dev_dbg(dev, "SMBus block-write op chosen");
} else if (i2c_check_functionality(adapter,
I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)) {
pdev->smb_write = idt_smb_write_i2c_block;
dev_dbg(dev, "SMBus i2c-block-write op chosen");
} else if (i2c_check_functionality(adapter,
I2C_FUNC_SMBUS_WRITE_WORD_DATA) &&
i2c_check_functionality(adapter,
I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) {
pdev->smb_write = idt_smb_write_word;
dev_warn(dev, "Use slow word/byte SMBus write op");
} else if (i2c_check_functionality(adapter,
I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) {
pdev->smb_write = idt_smb_write_byte;
dev_warn(dev, "Use slow byte SMBus write op");
} else /* no supported smbus write operations */ {
dev_err(dev, "No supported SMBus write op");
return -EPFNOSUPPORT;
}
/* Initialize IDT SMBus slave interface mutex */
mutex_init(&pdev->smb_mtx);
return 0;
}
/*
* idt_check_dev() - check whether it's really IDT 89HPESx device
* @pdev: Pointer to the driver data
* Return status of i2c adapter check operation
*/
static int idt_check_dev(struct idt_89hpesx_dev *pdev)
{
struct device *dev = &pdev->client->dev;
u32 viddid;
int ret;
/* Read VID and DID directly from IDT memory space */
ret = idt_csr_read(pdev, IDT_VIDDID_CSR, &viddid);
if (ret != 0) {
dev_err(dev, "Failed to read VID/DID");
return ret;
}
/* Check whether it's IDT device */
if ((viddid & IDT_VID_MASK) != PCI_VENDOR_ID_IDT) {
dev_err(dev, "Got unsupported VID/DID: 0x%08x", viddid);
return -ENODEV;
}
dev_info(dev, "Found IDT 89HPES device VID:0x%04x, DID:0x%04x",
(viddid & IDT_VID_MASK), (viddid >> 16));
return 0;
}
/*
* idt_create_sysfs_files() - create sysfs attribute files
* @pdev: Pointer to the driver data
* Return status of operation
*/
static int idt_create_sysfs_files(struct idt_89hpesx_dev *pdev)
{
struct device *dev = &pdev->client->dev;
int ret;
/* Don't do anything if EEPROM isn't accessible */
if (pdev->eesize == 0) {
dev_dbg(dev, "Skip creating sysfs-files");
return 0;
}
/* Allocate memory for attribute file */
pdev->ee_file = devm_kmalloc(dev, sizeof(*pdev->ee_file), GFP_KERNEL);
if (!pdev->ee_file)
return -ENOMEM;
/* Copy the declared EEPROM attr structure to change some of fields */
memcpy(pdev->ee_file, &bin_attr_eeprom, sizeof(*pdev->ee_file));
/* In case of read-only EEPROM get rid of write ability */
if (pdev->eero) {
pdev->ee_file->attr.mode &= ~0200;
pdev->ee_file->write = NULL;
}
/* Create EEPROM sysfs file */
pdev->ee_file->size = pdev->eesize;
ret = sysfs_create_bin_file(&dev->kobj, pdev->ee_file);
if (ret != 0) {
dev_err(dev, "Failed to create EEPROM sysfs-node");
return ret;
}
return 0;
}
/*
* idt_remove_sysfs_files() - remove sysfs attribute files
* @pdev: Pointer to the driver data
*/
static void idt_remove_sysfs_files(struct idt_89hpesx_dev *pdev)
{
struct device *dev = &pdev->client->dev;
/* Don't do anything if EEPROM wasn't accessible */
if (pdev->eesize == 0)
return;
/* Remove EEPROM sysfs file */
sysfs_remove_bin_file(&dev->kobj, pdev->ee_file);
}
/*
* idt_create_dbgfs_files() - create debugfs files
* @pdev: Pointer to the driver data
*/
#define CSRNAME_LEN ((size_t)32)
static void idt_create_dbgfs_files(struct idt_89hpesx_dev *pdev)
{
struct i2c_client *cli = pdev->client;
char fname[CSRNAME_LEN];
/* Create Debugfs directory for CSR file */
snprintf(fname, CSRNAME_LEN, "%d-%04hx", cli->adapter->nr, cli->addr);
pdev->csr_dir = debugfs_create_dir(fname, csr_dbgdir);
/* Create Debugfs file for CSR read/write operations */
debugfs_create_file(cli->name, 0600, pdev->csr_dir, pdev,
&csr_dbgfs_ops);
}
/*
* idt_remove_dbgfs_files() - remove debugfs files
* @pdev: Pointer to the driver data
*/
static void idt_remove_dbgfs_files(struct idt_89hpesx_dev *pdev)
{
/* Remove CSR directory and it sysfs-node */
debugfs_remove_recursive(pdev->csr_dir);
}
/*
* idt_probe() - IDT 89HPESx driver probe() callback method
*/
static int idt_probe(struct i2c_client *client)
{
struct idt_89hpesx_dev *pdev;
int ret;
/* Create driver data */
pdev = idt_create_pdev(client);
if (IS_ERR(pdev))
return PTR_ERR(pdev);
/* Set SMBus operations */
ret = idt_set_smbus_ops(pdev);
if (ret != 0)
goto err_free_pdev;
/* Check whether it is truly IDT 89HPESx device */
ret = idt_check_dev(pdev);
if (ret != 0)
goto err_free_pdev;
/* Create sysfs files */
ret = idt_create_sysfs_files(pdev);
if (ret != 0)
goto err_free_pdev;
/* Create debugfs files */
idt_create_dbgfs_files(pdev);
return 0;
err_free_pdev:
idt_free_pdev(pdev);
return ret;
}
/*
* idt_remove() - IDT 89HPESx driver remove() callback method
*/
static void idt_remove(struct i2c_client *client)
{
struct idt_89hpesx_dev *pdev = i2c_get_clientdata(client);
/* Remove debugfs files first */
idt_remove_dbgfs_files(pdev);
/* Remove sysfs files */
idt_remove_sysfs_files(pdev);
/* Discard driver data structure */
idt_free_pdev(pdev);
}
/*
* ee_ids - array of supported EEPROMs
*/
static const struct i2c_device_id ee_ids[] = {
{ "24c32", 4096},
{ "24c64", 8192},
{ "24c128", 16384},
{ "24c256", 32768},
{ "24c512", 65536},
{}
};
MODULE_DEVICE_TABLE(i2c, ee_ids);
/*
* idt_ids - supported IDT 89HPESx devices
*/
static const struct i2c_device_id idt_ids[] = {
{ "89hpes8nt2", 0 },
{ "89hpes12nt3", 0 },
{ "89hpes24nt6ag2", 0 },
{ "89hpes32nt8ag2", 0 },
{ "89hpes32nt8bg2", 0 },
{ "89hpes12nt12g2", 0 },
{ "89hpes16nt16g2", 0 },
{ "89hpes24nt24g2", 0 },
{ "89hpes32nt24ag2", 0 },
{ "89hpes32nt24bg2", 0 },
{ "89hpes12n3", 0 },
{ "89hpes12n3a", 0 },
{ "89hpes24n3", 0 },
{ "89hpes24n3a", 0 },
{ "89hpes32h8", 0 },
{ "89hpes32h8g2", 0 },
{ "89hpes48h12", 0 },
{ "89hpes48h12g2", 0 },
{ "89hpes48h12ag2", 0 },
{ "89hpes16h16", 0 },
{ "89hpes22h16", 0 },
{ "89hpes22h16g2", 0 },
{ "89hpes34h16", 0 },
{ "89hpes34h16g2", 0 },
{ "89hpes64h16", 0 },
{ "89hpes64h16g2", 0 },
{ "89hpes64h16ag2", 0 },
/* { "89hpes3t3", 0 }, // No SMBus-slave iface */
{ "89hpes12t3g2", 0 },
{ "89hpes24t3g2", 0 },
/* { "89hpes4t4", 0 }, // No SMBus-slave iface */
{ "89hpes16t4", 0 },
{ "89hpes4t4g2", 0 },
{ "89hpes10t4g2", 0 },
{ "89hpes16t4g2", 0 },
{ "89hpes16t4ag2", 0 },
{ "89hpes5t5", 0 },
{ "89hpes6t5", 0 },
{ "89hpes8t5", 0 },
{ "89hpes8t5a", 0 },
{ "89hpes24t6", 0 },
{ "89hpes6t6g2", 0 },
{ "89hpes24t6g2", 0 },
{ "89hpes16t7", 0 },
{ "89hpes32t8", 0 },
{ "89hpes32t8g2", 0 },
{ "89hpes48t12", 0 },
{ "89hpes48t12g2", 0 },
{ /* END OF LIST */ }
};
MODULE_DEVICE_TABLE(i2c, idt_ids);
static const struct of_device_id idt_of_match[] = {
{ .compatible = "idt,89hpes8nt2", },
{ .compatible = "idt,89hpes12nt3", },
{ .compatible = "idt,89hpes24nt6ag2", },
{ .compatible = "idt,89hpes32nt8ag2", },
{ .compatible = "idt,89hpes32nt8bg2", },
{ .compatible = "idt,89hpes12nt12g2", },
{ .compatible = "idt,89hpes16nt16g2", },
{ .compatible = "idt,89hpes24nt24g2", },
{ .compatible = "idt,89hpes32nt24ag2", },
{ .compatible = "idt,89hpes32nt24bg2", },
{ .compatible = "idt,89hpes12n3", },
{ .compatible = "idt,89hpes12n3a", },
{ .compatible = "idt,89hpes24n3", },
{ .compatible = "idt,89hpes24n3a", },
{ .compatible = "idt,89hpes32h8", },
{ .compatible = "idt,89hpes32h8g2", },
{ .compatible = "idt,89hpes48h12", },
{ .compatible = "idt,89hpes48h12g2", },
{ .compatible = "idt,89hpes48h12ag2", },
{ .compatible = "idt,89hpes16h16", },
{ .compatible = "idt,89hpes22h16", },
{ .compatible = "idt,89hpes22h16g2", },
{ .compatible = "idt,89hpes34h16", },
{ .compatible = "idt,89hpes34h16g2", },
{ .compatible = "idt,89hpes64h16", },
{ .compatible = "idt,89hpes64h16g2", },
{ .compatible = "idt,89hpes64h16ag2", },
{ .compatible = "idt,89hpes12t3g2", },
{ .compatible = "idt,89hpes24t3g2", },
{ .compatible = "idt,89hpes16t4", },
{ .compatible = "idt,89hpes4t4g2", },
{ .compatible = "idt,89hpes10t4g2", },
{ .compatible = "idt,89hpes16t4g2", },
{ .compatible = "idt,89hpes16t4ag2", },
{ .compatible = "idt,89hpes5t5", },
{ .compatible = "idt,89hpes6t5", },
{ .compatible = "idt,89hpes8t5", },
{ .compatible = "idt,89hpes8t5a", },
{ .compatible = "idt,89hpes24t6", },
{ .compatible = "idt,89hpes6t6g2", },
{ .compatible = "idt,89hpes24t6g2", },
{ .compatible = "idt,89hpes16t7", },
{ .compatible = "idt,89hpes32t8", },
{ .compatible = "idt,89hpes32t8g2", },
{ .compatible = "idt,89hpes48t12", },
{ .compatible = "idt,89hpes48t12g2", },
{ },
};
MODULE_DEVICE_TABLE(of, idt_of_match);
/*
* idt_driver - IDT 89HPESx driver structure
*/
static struct i2c_driver idt_driver = {
.driver = {
.name = IDT_NAME,
.of_match_table = idt_of_match,
},
.probe_new = idt_probe,
.remove = idt_remove,
.id_table = idt_ids,
};
/*
* idt_init() - IDT 89HPESx driver init() callback method
*/
static int __init idt_init(void)
{
int ret;
/* Create Debugfs directory first */
if (debugfs_initialized())
csr_dbgdir = debugfs_create_dir("idt_csr", NULL);
/* Add new i2c-device driver */
ret = i2c_add_driver(&idt_driver);
if (ret) {
debugfs_remove_recursive(csr_dbgdir);
return ret;
}
return 0;
}
module_init(idt_init);
/*
* idt_exit() - IDT 89HPESx driver exit() callback method
*/
static void __exit idt_exit(void)
{
/* Discard debugfs directory and all files if any */
debugfs_remove_recursive(csr_dbgdir);
/* Unregister i2c-device driver */
i2c_del_driver(&idt_driver);
}
module_exit(idt_exit);