forked from luck/tmp_suning_uos_patched
i2c: Add bus driver for for OSIF USB i2c device.
OSIF, Open Source InterFace, is a USB based i2c bus master. The origional design was based on i2c-tiny-usb, but more modern versions of the firmware running on the MegaAVR microcontroller use a different protocol over the USB. This code is based on Barry Carter <barry.carter@gmail.com> driver. Signed-off-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Andrew Lunn
Wolfram Sang
parent
e5c6e7f296
commit
83e53a8f12
@ -874,6 +874,16 @@ config I2C_PARPORT_LIGHT
|
||||
This support is also available as a module. If so, the module
|
||||
will be called i2c-parport-light.
|
||||
|
||||
config I2C_ROBOTFUZZ_OSIF
|
||||
tristate "RobotFuzz Open Source InterFace USB adapter"
|
||||
depends on USB
|
||||
help
|
||||
If you say yes to this option, support will be included for the
|
||||
RobotFuzz Open Source InterFace USB to I2C interface.
|
||||
|
||||
This driver can also be built as a module. If so, the module
|
||||
will be called i2c-osif.
|
||||
|
||||
config I2C_TAOS_EVM
|
||||
tristate "TAOS evaluation module"
|
||||
depends on TTY
|
||||
|
||||
@ -84,6 +84,7 @@ obj-$(CONFIG_I2C_RCAR) += i2c-rcar.o
|
||||
obj-$(CONFIG_I2C_DIOLAN_U2C) += i2c-diolan-u2c.o
|
||||
obj-$(CONFIG_I2C_PARPORT) += i2c-parport.o
|
||||
obj-$(CONFIG_I2C_PARPORT_LIGHT) += i2c-parport-light.o
|
||||
obj-$(CONFIG_I2C_ROBOTFUZZ_OSIF) += i2c-robotfuzz-osif.o
|
||||
obj-$(CONFIG_I2C_TAOS_EVM) += i2c-taos-evm.o
|
||||
obj-$(CONFIG_I2C_TINY_USB) += i2c-tiny-usb.o
|
||||
obj-$(CONFIG_I2C_VIPERBOARD) += i2c-viperboard.o
|
||||
|
||||
202
drivers/i2c/busses/i2c-robotfuzz-osif.c
Normal file
202
drivers/i2c/busses/i2c-robotfuzz-osif.c
Normal file
@ -0,0 +1,202 @@
|
||||
/*
|
||||
* Driver for RobotFuzz OSIF
|
||||
*
|
||||
* Copyright (c) 2013 Andrew Lunn <andrew@lunn.ch>
|
||||
* Copyright (c) 2007 Barry Carter <Barry.Carter@robotfuzz.com>
|
||||
*
|
||||
* Based on the i2c-tiny-usb by
|
||||
*
|
||||
* Copyright (C) 2006 Til 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/module.h>
|
||||
#include <linux/errno.h>
|
||||
#include <linux/i2c.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/usb.h>
|
||||
|
||||
#define OSIFI2C_READ 20
|
||||
#define OSIFI2C_WRITE 21
|
||||
#define OSIFI2C_STOP 22
|
||||
#define OSIFI2C_STATUS 23
|
||||
#define OSIFI2C_SET_BIT_RATE 24
|
||||
|
||||
#define STATUS_ADDRESS_ACK 0
|
||||
#define STATUS_ADDRESS_NAK 2
|
||||
|
||||
struct osif_priv {
|
||||
struct usb_device *usb_dev;
|
||||
struct usb_interface *interface;
|
||||
struct i2c_adapter adapter;
|
||||
unsigned char status;
|
||||
};
|
||||
|
||||
static int osif_usb_read(struct i2c_adapter *adapter, int cmd,
|
||||
int value, int index, void *data, int len)
|
||||
{
|
||||
struct osif_priv *priv = adapter->algo_data;
|
||||
|
||||
return usb_control_msg(priv->usb_dev, usb_rcvctrlpipe(priv->usb_dev, 0),
|
||||
cmd, USB_TYPE_VENDOR | USB_RECIP_INTERFACE |
|
||||
USB_DIR_IN, value, index, data, len, 2000);
|
||||
}
|
||||
|
||||
static int osif_usb_write(struct i2c_adapter *adapter, int cmd,
|
||||
int value, int index, void *data, int len)
|
||||
{
|
||||
|
||||
struct osif_priv *priv = adapter->algo_data;
|
||||
|
||||
return usb_control_msg(priv->usb_dev, usb_sndctrlpipe(priv->usb_dev, 0),
|
||||
cmd, USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
|
||||
value, index, data, len, 2000);
|
||||
}
|
||||
|
||||
static int osif_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs,
|
||||
int num)
|
||||
{
|
||||
struct osif_priv *priv = adapter->algo_data;
|
||||
struct i2c_msg *pmsg;
|
||||
int ret = 0;
|
||||
int i, cmd;
|
||||
|
||||
for (i = 0; ret >= 0 && i < num; i++) {
|
||||
pmsg = &msgs[i];
|
||||
|
||||
if (pmsg->flags & I2C_M_RD) {
|
||||
cmd = OSIFI2C_READ;
|
||||
|
||||
ret = osif_usb_read(adapter, cmd, pmsg->flags,
|
||||
pmsg->addr, pmsg->buf,
|
||||
pmsg->len);
|
||||
if (ret != pmsg->len) {
|
||||
dev_err(&adapter->dev, "failure reading data\n");
|
||||
return -EREMOTEIO;
|
||||
}
|
||||
} else {
|
||||
cmd = OSIFI2C_WRITE;
|
||||
|
||||
ret = osif_usb_write(adapter, cmd, pmsg->flags,
|
||||
pmsg->addr, pmsg->buf, pmsg->len);
|
||||
if (ret != pmsg->len) {
|
||||
dev_err(&adapter->dev, "failure writing data\n");
|
||||
return -EREMOTEIO;
|
||||
}
|
||||
}
|
||||
|
||||
ret = osif_usb_read(adapter, OSIFI2C_STOP, 0, 0, NULL, 0);
|
||||
if (ret) {
|
||||
dev_err(&adapter->dev, "failure sending STOP\n");
|
||||
return -EREMOTEIO;
|
||||
}
|
||||
|
||||
/* read status */
|
||||
ret = osif_usb_read(adapter, OSIFI2C_STATUS, 0, 0,
|
||||
&priv->status, 1);
|
||||
if (ret != 1) {
|
||||
dev_err(&adapter->dev, "failure reading status\n");
|
||||
return -EREMOTEIO;
|
||||
}
|
||||
|
||||
if (priv->status != STATUS_ADDRESS_ACK) {
|
||||
dev_dbg(&adapter->dev, "status = %d\n", priv->status);
|
||||
return -EREMOTEIO;
|
||||
}
|
||||
}
|
||||
|
||||
return i;
|
||||
}
|
||||
|
||||
static u32 osif_func(struct i2c_adapter *adapter)
|
||||
{
|
||||
return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
|
||||
}
|
||||
|
||||
static struct i2c_algorithm osif_algorithm = {
|
||||
.master_xfer = osif_xfer,
|
||||
.functionality = osif_func,
|
||||
};
|
||||
|
||||
#define USB_OSIF_VENDOR_ID 0x1964
|
||||
#define USB_OSIF_PRODUCT_ID 0x0001
|
||||
|
||||
static struct usb_device_id osif_table[] = {
|
||||
{ USB_DEVICE(USB_OSIF_VENDOR_ID, USB_OSIF_PRODUCT_ID) },
|
||||
{ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(usb, osif_table);
|
||||
|
||||
static int osif_probe(struct usb_interface *interface,
|
||||
const struct usb_device_id *id)
|
||||
{
|
||||
int ret;
|
||||
struct osif_priv *priv;
|
||||
u16 version;
|
||||
|
||||
priv = devm_kzalloc(&interface->dev, sizeof(*priv), GFP_KERNEL);
|
||||
if (!priv)
|
||||
return -ENOMEM;
|
||||
|
||||
priv->usb_dev = usb_get_dev(interface_to_usbdev(interface));
|
||||
priv->interface = interface;
|
||||
|
||||
usb_set_intfdata(interface, priv);
|
||||
|
||||
priv->adapter.owner = THIS_MODULE;
|
||||
priv->adapter.class = I2C_CLASS_HWMON;
|
||||
priv->adapter.algo = &osif_algorithm;
|
||||
priv->adapter.algo_data = priv;
|
||||
snprintf(priv->adapter.name, sizeof(priv->adapter.name),
|
||||
"OSIF at bus %03d device %03d",
|
||||
priv->usb_dev->bus->busnum, priv->usb_dev->devnum);
|
||||
|
||||
/*
|
||||
* Set bus frequency. The frequency is:
|
||||
* 120,000,000 / ( 16 + 2 * div * 4^prescale).
|
||||
* Using dev = 52, prescale = 0 give 100KHz */
|
||||
ret = osif_usb_read(&priv->adapter, OSIFI2C_SET_BIT_RATE, 52, 0,
|
||||
NULL, 0);
|
||||
if (ret) {
|
||||
dev_err(&interface->dev, "failure sending bit rate");
|
||||
usb_put_dev(priv->usb_dev);
|
||||
return ret;
|
||||
}
|
||||
|
||||
i2c_add_adapter(&(priv->adapter));
|
||||
|
||||
version = le16_to_cpu(priv->usb_dev->descriptor.bcdDevice);
|
||||
dev_info(&interface->dev,
|
||||
"version %x.%02x found at bus %03d address %03d",
|
||||
version >> 8, version & 0xff,
|
||||
priv->usb_dev->bus->busnum, priv->usb_dev->devnum);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void osif_disconnect(struct usb_interface *interface)
|
||||
{
|
||||
struct osif_priv *priv = usb_get_intfdata(interface);
|
||||
|
||||
i2c_del_adapter(&(priv->adapter));
|
||||
usb_set_intfdata(interface, NULL);
|
||||
usb_put_dev(priv->usb_dev);
|
||||
}
|
||||
|
||||
static struct usb_driver osif_driver = {
|
||||
.name = "RobotFuzz Open Source InterFace, OSIF",
|
||||
.probe = osif_probe,
|
||||
.disconnect = osif_disconnect,
|
||||
.id_table = osif_table,
|
||||
};
|
||||
|
||||
module_usb_driver(osif_driver);
|
||||
|
||||
MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>");
|
||||
MODULE_AUTHOR("Barry Carter <barry.carter@robotfuzz.com>");
|
||||
MODULE_DESCRIPTION("RobotFuzz OSIF driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
Loading…
Reference in New Issue
Block a user