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i2c-ch341.c
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/*
* Driver for the CH341 USB-I2C adapter
*
* Copyright (c) 2014 Marco Gittler
*
* Derived from:
* i2c-tiny-usb.c
* Copyright (C) 2006-2007 Till Harbaum (Till@Harbaum.org)
*
* 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, version 2.
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/i2c.h>
#define DRIVER_NAME "i2c-ch341-u2c"
#define USB_VENDOR_ID_CH341 0x1a86
#define USB_DEVICE_ID_CH341_U2C 0x5512
#define DEFAULT_CONFIGURATION 0x01
#define DEFAULT_TIMEOUT 100 // 100mS for USB timeouts
#define mCH341_PACKET_LENGTH 32
#define mCH341_PKT_LEN_SHORT 8
#define mCH341_ENDP_INTER_UP 0x81
#define mCH341_ENDP_INTER_DOWN 0x01
#define mCH341_ENDP_DATA_UP 0x82
#define mCH341_ENDP_DATA_DOWN 0x02
#define mCH341_VENDOR_READ 0xC0
#define mCH341_VENDOR_WRITE 0x40
#define mCH341_PARA_INIT 0xB1
#define mCH341_I2C_STATUS 0x52
#define mCH341_I2C_COMMAND 0x53
#define mCH341_PARA_CMD_R0 0xAC
#define mCH341_PARA_CMD_R1 0xAD
#define mCH341_PARA_CMD_W0 0xA6
#define mCH341_PARA_CMD_W1 0xA7
#define mCH341_PARA_CMD_STS 0xA0
#define mCH341A_CMD_SET_OUTPUT 0xA1
#define mCH341A_CMD_IO_ADDR 0xA2
#define mCH341A_CMD_PRINT_OUT 0xA3
#define mCH341A_CMD_SPI_STREAM 0xA8
#define mCH341A_CMD_SIO_STREAM 0xA9
#define mCH341A_CMD_I2C_STREAM 0xAA
#define mCH341A_CMD_UIO_STREAM 0xAB
#define mCH341A_BUF_CLEAR 0xB2
#define mCH341A_I2C_CMD_X 0x54
#define mCH341A_DELAY_MS 0x5E
#define mCH341A_GET_VER 0x5F
#define mCH341_EPP_IO_MAX ( mCH341_PACKET_LENGTH - 1 )
#define mCH341A_EPP_IO_MAX 0xFF
#define mCH341A_CMD_IO_ADDR_W 0x00
#define mCH341A_CMD_IO_ADDR_R 0x80
#define mCH341A_CMD_I2C_STM_STA 0x74
#define mCH341A_CMD_I2C_STM_STO 0x75
#define mCH341A_CMD_I2C_STM_OUT 0x80
#define mCH341A_CMD_I2C_STM_IN 0xC0
#define mCH341A_CMD_I2C_STM_MAX ( min( 0x3F, mCH341_PACKET_LENGTH ) )
#define mCH341A_CMD_I2C_STM_SET 0x60
#define mCH341A_CMD_I2C_STM_US 0x40
#define mCH341A_CMD_I2C_STM_MS 0x50
#define mCH341A_CMD_I2C_STM_DLY 0x0F
#define mCH341A_CMD_I2C_STM_END 0x00
#define mCH341A_CMD_UIO_STM_IN 0x00
#define mCH341A_CMD_UIO_STM_DIR 0x40
#define mCH341A_CMD_UIO_STM_OUT 0x80
#define mCH341A_CMD_UIO_STM_US 0xC0
#define mCH341A_CMD_UIO_STM_END 0x20
#define mCH341_PARA_MODE_EPP 0x00
#define mCH341_PARA_MODE_EPP17 0x00
#define mCH341_PARA_MODE_EPP19 0x01
#define mCH341_PARA_MODE_MEM 0x02
#define CH341_I2C_LOW_SPEED 0 // low speed - 20kHz
#define CH341_I2C_STANDARD_SPEED 1 // standard speed - 100kHz
#define CH341_I2C_FAST_SPEED 2 // fast speed - 400kHz
#define CH341_I2C_HIGH_SPEED 3 // high speed - 750kHz
#define U2C_I2C_FREQ_FAST 400000
#define U2C_I2C_FREQ_STD 100000
#define U2C_I2C_FREQ(s) (1000000 / (2 * (s - 1) + 10))
#define RESP_OK 0x00
#define RESP_FAILED 0x01
#define RESP_BAD_MEMADDR 0x04
#define RESP_DATA_ERR 0x05
#define RESP_NOT_IMPLEMENTED 0x06
#define RESP_NACK 0x07
#define RESP_TIMEOUT 0x09
#define CH341_OUTBUF_LEN 128
#define CH341_INBUF_LEN 256 /* Maximum supported receive length */
struct i2c_ch341_u2c {
u8 obuffer[CH341_OUTBUF_LEN]; /* output buffer */
u8 ibuffer[CH341_INBUF_LEN]; /* input buffer */
int ep_in, ep_out; /* Endpoints */
struct usb_device *usb_dev; /* the usb device for this device */
struct usb_interface *interface;/* the interface for this device */
struct i2c_adapter adapter; /* i2c related things */
int olen; /* Output buffer length */
int ocount; /* Number of enqueued messages */
int ilen;
int check_ack;
};
static uint frequency = U2C_I2C_FREQ_STD; /* I2C clock frequency in Hz */
module_param(frequency, uint, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(frequency, "I2C clock frequency in hertz");
static int ch341_usb_transfer(struct i2c_ch341_u2c *dev)
{
int ret = 0;
int actual;
int i;
if (!dev->olen || !dev->ocount) {
return -EINVAL;
}
ret = usb_bulk_msg(dev->usb_dev,
usb_sndbulkpipe(dev->usb_dev, dev->ep_out),
dev->obuffer, dev->olen, &actual,
DEFAULT_TIMEOUT);
if (!ret) {
dev->ocount = 1;
for (i = 0; i < dev->ocount; i++) {
int tmpret;
memset(dev->ibuffer, 0, 256);
tmpret = usb_bulk_msg(dev->usb_dev,
usb_rcvbulkpipe(dev->usb_dev,
dev->ep_in),
dev->ibuffer,
sizeof(dev->ibuffer), &actual,
DEFAULT_TIMEOUT);
if (dev->olen > 1 && dev->obuffer[0] == 0xaa && dev->obuffer[1] == 0x60) {
return 0; // set speed should not fail
}
//if (actual>0)
ret = tmpret;
//dev->ilen=actual;
if (dev->check_ack == 0 && (dev->ibuffer[0 ] & 0x80) != 0) { //detect chip write len 0
//dev_info(&dev->interface->dev,"_nackonly %d ",-EIO);
return -EIO;
}
if (ret == 0 && actual > 0) {
//dev_info(&dev->interface->dev,"__ibuf 0=%02x 1=%02x ",dev->ibuffer[0],dev->ibuffer[1]);
ret = actual;
dev->ilen = actual;
/*switch (dev->ibuffer[actual - 1]&0x80) {
case RESP_TIMEOUT:
ret = -ETIMEDOUT;
break;
case RESP_OK:
ret = actual - 1;
break;
default:
//ret = 0;
dev->ilen=actual;
break;
}*/
}
}
}
dev->olen = 0;
dev->ocount = 0;
return ret;
}
/* Send command (no data) */
static int ch341_usb_cmd_msg(struct i2c_ch341_u2c *dev, u8 *msg, u8 len)
{
//dev_info(&dev->interface->dev,"%s",__FUNCTION__);
memcpy(dev->obuffer, msg, len);
dev->olen = len;
dev->ocount++;
return ch341_usb_transfer(dev);
}
static int ch341_usb_cmd_read_addr(struct i2c_ch341_u2c *dev, u8 addr, u8 *data, u8 datalen, bool recv_len)
{
u8 msg0[256];
int msgsize = 0, ret, ilen = datalen;
msg0[msgsize++] = mCH341A_CMD_I2C_STREAM;
msg0[msgsize++] = mCH341A_CMD_I2C_STM_STA;
msg0[msgsize++] = mCH341A_CMD_I2C_STM_OUT | (recv_len ? 1 : 0); // 1 bytE
msg0[msgsize++] = (addr) | 0x01 ; //&0xfe;
for (; ilen > 0 ; ilen--) {
msg0[msgsize++] = mCH341A_CMD_I2C_STM_IN | (ilen - 1);
}
msg0[msgsize++] = mCH341A_CMD_I2C_STM_STO;
msg0[msgsize++] = mCH341A_CMD_I2C_STM_END;
dev->check_ack = recv_len;
ret = ch341_usb_cmd_msg(dev, msg0, msgsize);
if (ret >= 0) {
memcpy(data, dev->ibuffer + (recv_len ? 0 : 1), dev->ilen - (recv_len ? 1 : 0));
}
return ret;
}
static int ch341_usb_cmd_write_addr(struct i2c_ch341_u2c *dev, u8 addr, u8 *data, u8 datalen)
{
u8 msg0[256];
int msgsize = 0, ret = -5;
msg0[msgsize++] = mCH341A_CMD_I2C_STREAM,
msg0[msgsize++] = mCH341A_CMD_I2C_STM_STA,
msg0[msgsize++] = mCH341A_CMD_I2C_STM_OUT | (datalen > 0 ? datalen + 1 : 0), // 1 byte
msg0[msgsize++] = addr & 0xfe,
dev->check_ack = 0; //(datalen>0);
memcpy(msg0 + msgsize, data, datalen);
msgsize += datalen;
msg0[msgsize++] = mCH341A_CMD_I2C_STM_STO;
msg0[msgsize++] = mCH341A_CMD_I2C_STM_END;
ret = ch341_usb_cmd_msg(dev, msg0, msgsize);
if (datalen > 0 && ret == -ETIMEDOUT) {
ret = 0;
}
return ret;
}
/*
static int ch341_i2c_start(struct i2c_ch341_u2c *dev)
{
u8 msg[]={
mCH341A_CMD_I2C_STREAM,
mCH341A_CMD_I2C_STM_STA,
mCH341A_CMD_I2C_STM_END
};
dev_info(&dev->interface->dev,"%s",__FUNCTION__);
return ch341_usb_cmd_msg(dev,msg,3);
}
static int ch341_i2c_stop(struct i2c_ch341_u2c *dev)
{
u8 msg[]={
mCH341A_CMD_I2C_STREAM,
mCH341A_CMD_I2C_STM_STO,
mCH341A_CMD_I2C_STM_END
};
dev_info(&dev->interface->dev,"%s",__FUNCTION__);
return ch341_usb_cmd_msg(dev,msg,3);
}
*/
static int ch341_set_speed(struct i2c_ch341_u2c *dev, u8 speed)
{
u8 msg[] = {
mCH341A_CMD_I2C_STREAM,
mCH341A_CMD_I2C_STM_SET | (speed & 0x03),
mCH341A_CMD_I2C_STM_END
};
return ch341_usb_cmd_msg(dev, msg, 3);
}
static int ch341_init(struct i2c_ch341_u2c *dev)
{
int speed, freq, ret;
dev_info(&dev->interface->dev, "%s", __FUNCTION__);
if (frequency >= 750000) {
speed = CH341_I2C_HIGH_SPEED;
freq = frequency;
} else if (frequency >= 400000) {
speed = CH341_I2C_FAST_SPEED;
freq = frequency;
} else if (frequency >= 200000 || frequency == 0) {
speed = CH341_I2C_STANDARD_SPEED;
freq = frequency;
} else {
speed = CH341_I2C_LOW_SPEED;
freq = frequency;
}
dev_info(&dev->interface->dev,
"CH341 U2C at USB bus %03d address %03d speed %d Hz\n",
dev->usb_dev->bus->busnum, dev->usb_dev->devnum, freq);
/* Set I2C speed */
ret = ch341_set_speed(dev, speed);
if (ret < 0) {
return ret;
}
return ret;
}
/* i2c layer */
static int ch341_usb_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs,
int num)
{
struct i2c_ch341_u2c *dev = i2c_get_adapdata(adapter);
struct i2c_msg *pmsg;
int i, ret;
for (i = 0; i < num; i++) {
pmsg = &msgs[i];
if (pmsg->flags & I2C_M_RD) {
int recv_len = pmsg->flags & I2C_M_RECV_LEN;
dev->ilen = recv_len;
ret = ch341_usb_cmd_read_addr(dev, pmsg->addr << 1 , pmsg->buf, pmsg->len, recv_len);
if (recv_len && ret > 0) {
pmsg->len = ret;
}
if (ret < 0) {
goto abort;
}
} else {
ret = ch341_usb_cmd_write_addr(dev, pmsg->addr << 1, pmsg->buf, pmsg->len);
if (ret < 0) {
goto abort;
}
}
}
ret = num;
abort:
//ch341_i2c_stop(dev);
return (ret < 0) ? ret : num;
}
/*
* Return list of supported functionality.
*/
static u32 ch341_usb_func(struct i2c_adapter *a)
{
return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL ;/*|
I2C_FUNC_SMBUS_READ_BLOCK_DATA | I2C_FUNC_SMBUS_BLOCK_PROC_CALL;*/
}
static const struct i2c_algorithm ch341_usb_algorithm = {
.master_xfer = ch341_usb_xfer,
.functionality = ch341_usb_func,
};
/* device layer */
static const struct usb_device_id ch341_u2c_table[] = {
{ USB_DEVICE(USB_VENDOR_ID_CH341, USB_DEVICE_ID_CH341_U2C) },
{ }
};
MODULE_DEVICE_TABLE(usb, ch341_u2c_table);
static void ch341_u2c_free(struct i2c_ch341_u2c *dev)
{
usb_put_dev(dev->usb_dev);
kfree(dev);
}
static int ch341_u2c_probe(struct usb_interface *interface,
const struct usb_device_id *id)
{
struct usb_device *udev;
struct usb_host_interface *hostif = interface->cur_altsetting;
struct i2c_ch341_u2c *dev;
const int ifnum = interface->altsetting[DEFAULT_CONFIGURATION].desc.bInterfaceNumber;
char *speed;
int ret;
if (hostif->desc.bInterfaceNumber != 0
|| hostif->desc.bNumEndpoints < 2) {
return -ENODEV;
}
/* allocate memory for our device state and initialize it */
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (dev == NULL) {
dev_err(&interface->dev, "no memory for device state\n");
ret = -ENOMEM;
goto error;
}
dev->ep_out = hostif->endpoint[1].desc.bEndpointAddress;
dev_info(&interface->dev, "ep_out=%x\n", dev->ep_out);
dev->ep_in = hostif->endpoint[0].desc.bEndpointAddress;
dev_info(&interface->dev, "ep_in=%x\n", dev->ep_in);
dev->usb_dev = usb_get_dev(interface_to_usbdev(interface));
dev->interface = interface;
udev = dev->usb_dev;
switch (udev->speed) {
case USB_SPEED_LOW:
speed = "1.5";
break;
case USB_SPEED_UNKNOWN:
case USB_SPEED_FULL:
speed = "12";
break;
case USB_SPEED_HIGH:
speed = "480";
break;
default:
speed = "unknown";
}
printk(KERN_INFO DRIVER_NAME
": New device %s %s @ %s Mbps "
"(%04x:%04x, interface %d, class %d, version %d.%02d)\n",
udev->manufacturer ? udev->manufacturer : "",
udev->product ? udev->product : "",
speed,
le16_to_cpu(udev->descriptor.idVendor),
le16_to_cpu(udev->descriptor.idProduct),
ifnum,
interface->altsetting->desc.bInterfaceNumber,
le16_to_cpu(udev->descriptor.bcdDevice % 0xff),
le16_to_cpu(udev->descriptor.bcdDevice >> 8 % 0xff)
);
/* save our data pointer in this interface device */
usb_set_intfdata(interface, dev);
/* setup i2c adapter description */
dev->adapter.owner = THIS_MODULE;
dev->adapter.class = I2C_CLASS_HWMON;
dev->adapter.algo = &ch341_usb_algorithm;
i2c_set_adapdata(&dev->adapter, dev);
snprintf(dev->adapter.name, sizeof(dev->adapter.name),
DRIVER_NAME " at bus %03d device %03d",
dev->usb_dev->bus->busnum, dev->usb_dev->devnum);
dev->adapter.dev.parent = &dev->interface->dev;
/* initialize ch341 i2c interface */
ret = ch341_init(dev);
if (ret < 0) {
dev_err(&interface->dev, "failed to initialize adapter\n");
goto error_free;
}
/* and finally attach to i2c layer */
ret = i2c_add_adapter(&dev->adapter);
if (ret < 0) {
dev_err(&interface->dev, "failed to add I2C adapter\n");
goto error_free;
}
dev_dbg(&interface->dev, "connected " DRIVER_NAME "\n");
return 0;
error_free:
usb_set_intfdata(interface, NULL);
ch341_u2c_free(dev);
error:
return ret;
}
static void ch341_u2c_disconnect(struct usb_interface *interface)
{
struct i2c_ch341_u2c *dev = usb_get_intfdata(interface);
i2c_del_adapter(&dev->adapter);
usb_set_intfdata(interface, NULL);
ch341_u2c_free(dev);
dev_dbg(&interface->dev, "disconnected\n");
}
static struct usb_driver ch341_u2c_driver = {
.name = DRIVER_NAME,
.probe = ch341_u2c_probe,
.disconnect = ch341_u2c_disconnect,
.id_table = ch341_u2c_table,
};
module_usb_driver(ch341_u2c_driver);
MODULE_AUTHOR("Marco Gittler <g.marco@freenet.de>");
MODULE_DESCRIPTION(DRIVER_NAME " driver");
MODULE_LICENSE("GPL");