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
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@ -874,6 +874,16 @@ config I2C_PARPORT_LIGHT
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This support is also available as a module. If so, the module
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will be called i2c-parport-light.
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config I2C_ROBOTFUZZ_OSIF
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tristate "RobotFuzz Open Source InterFace USB adapter"
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depends on USB
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help
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If you say yes to this option, support will be included for the
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RobotFuzz Open Source InterFace USB to I2C interface.
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This driver can also be built as a module. If so, the module
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will be called i2c-osif.
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config I2C_TAOS_EVM
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tristate "TAOS evaluation module"
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depends on TTY
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@ -84,6 +84,7 @@ obj-$(CONFIG_I2C_RCAR) += i2c-rcar.o
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obj-$(CONFIG_I2C_DIOLAN_U2C) += i2c-diolan-u2c.o
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obj-$(CONFIG_I2C_PARPORT) += i2c-parport.o
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obj-$(CONFIG_I2C_PARPORT_LIGHT) += i2c-parport-light.o
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obj-$(CONFIG_I2C_ROBOTFUZZ_OSIF) += i2c-robotfuzz-osif.o
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obj-$(CONFIG_I2C_TAOS_EVM) += i2c-taos-evm.o
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obj-$(CONFIG_I2C_TINY_USB) += i2c-tiny-usb.o
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obj-$(CONFIG_I2C_VIPERBOARD) += i2c-viperboard.o
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@ -0,0 +1,202 @@
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/*
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* Driver for RobotFuzz OSIF
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*
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* Copyright (c) 2013 Andrew Lunn <andrew@lunn.ch>
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* Copyright (c) 2007 Barry Carter <Barry.Carter@robotfuzz.com>
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*
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* Based on the i2c-tiny-usb by
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*
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* Copyright (C) 2006 Til Harbaum (Till@Harbaum.org)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/i2c.h>
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#include <linux/slab.h>
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#include <linux/usb.h>
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#define OSIFI2C_READ 20
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#define OSIFI2C_WRITE 21
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#define OSIFI2C_STOP 22
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#define OSIFI2C_STATUS 23
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#define OSIFI2C_SET_BIT_RATE 24
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#define STATUS_ADDRESS_ACK 0
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#define STATUS_ADDRESS_NAK 2
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struct osif_priv {
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struct usb_device *usb_dev;
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struct usb_interface *interface;
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struct i2c_adapter adapter;
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unsigned char status;
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};
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static int osif_usb_read(struct i2c_adapter *adapter, int cmd,
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int value, int index, void *data, int len)
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{
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struct osif_priv *priv = adapter->algo_data;
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return usb_control_msg(priv->usb_dev, usb_rcvctrlpipe(priv->usb_dev, 0),
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cmd, USB_TYPE_VENDOR | USB_RECIP_INTERFACE |
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USB_DIR_IN, value, index, data, len, 2000);
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}
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static int osif_usb_write(struct i2c_adapter *adapter, int cmd,
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int value, int index, void *data, int len)
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{
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struct osif_priv *priv = adapter->algo_data;
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return usb_control_msg(priv->usb_dev, usb_sndctrlpipe(priv->usb_dev, 0),
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cmd, USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
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value, index, data, len, 2000);
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}
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static int osif_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs,
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int num)
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{
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struct osif_priv *priv = adapter->algo_data;
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struct i2c_msg *pmsg;
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int ret = 0;
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int i, cmd;
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for (i = 0; ret >= 0 && i < num; i++) {
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pmsg = &msgs[i];
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if (pmsg->flags & I2C_M_RD) {
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cmd = OSIFI2C_READ;
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ret = osif_usb_read(adapter, cmd, pmsg->flags,
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pmsg->addr, pmsg->buf,
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pmsg->len);
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if (ret != pmsg->len) {
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dev_err(&adapter->dev, "failure reading data\n");
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return -EREMOTEIO;
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}
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} else {
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cmd = OSIFI2C_WRITE;
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ret = osif_usb_write(adapter, cmd, pmsg->flags,
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pmsg->addr, pmsg->buf, pmsg->len);
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if (ret != pmsg->len) {
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dev_err(&adapter->dev, "failure writing data\n");
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return -EREMOTEIO;
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}
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}
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ret = osif_usb_read(adapter, OSIFI2C_STOP, 0, 0, NULL, 0);
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if (ret) {
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dev_err(&adapter->dev, "failure sending STOP\n");
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return -EREMOTEIO;
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}
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/* read status */
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ret = osif_usb_read(adapter, OSIFI2C_STATUS, 0, 0,
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&priv->status, 1);
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if (ret != 1) {
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dev_err(&adapter->dev, "failure reading status\n");
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return -EREMOTEIO;
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}
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if (priv->status != STATUS_ADDRESS_ACK) {
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dev_dbg(&adapter->dev, "status = %d\n", priv->status);
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return -EREMOTEIO;
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}
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}
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return i;
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}
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static u32 osif_func(struct i2c_adapter *adapter)
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{
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return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
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}
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static struct i2c_algorithm osif_algorithm = {
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.master_xfer = osif_xfer,
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.functionality = osif_func,
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};
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#define USB_OSIF_VENDOR_ID 0x1964
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#define USB_OSIF_PRODUCT_ID 0x0001
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static struct usb_device_id osif_table[] = {
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{ USB_DEVICE(USB_OSIF_VENDOR_ID, USB_OSIF_PRODUCT_ID) },
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{ }
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};
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MODULE_DEVICE_TABLE(usb, osif_table);
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static int osif_probe(struct usb_interface *interface,
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const struct usb_device_id *id)
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{
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int ret;
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struct osif_priv *priv;
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u16 version;
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priv = devm_kzalloc(&interface->dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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priv->usb_dev = usb_get_dev(interface_to_usbdev(interface));
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priv->interface = interface;
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usb_set_intfdata(interface, priv);
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priv->adapter.owner = THIS_MODULE;
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priv->adapter.class = I2C_CLASS_HWMON;
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priv->adapter.algo = &osif_algorithm;
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priv->adapter.algo_data = priv;
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snprintf(priv->adapter.name, sizeof(priv->adapter.name),
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"OSIF at bus %03d device %03d",
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priv->usb_dev->bus->busnum, priv->usb_dev->devnum);
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/*
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* Set bus frequency. The frequency is:
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* 120,000,000 / ( 16 + 2 * div * 4^prescale).
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* Using dev = 52, prescale = 0 give 100KHz */
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ret = osif_usb_read(&priv->adapter, OSIFI2C_SET_BIT_RATE, 52, 0,
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NULL, 0);
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if (ret) {
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dev_err(&interface->dev, "failure sending bit rate");
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usb_put_dev(priv->usb_dev);
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return ret;
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}
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i2c_add_adapter(&(priv->adapter));
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version = le16_to_cpu(priv->usb_dev->descriptor.bcdDevice);
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dev_info(&interface->dev,
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"version %x.%02x found at bus %03d address %03d",
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version >> 8, version & 0xff,
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priv->usb_dev->bus->busnum, priv->usb_dev->devnum);
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return 0;
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}
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static void osif_disconnect(struct usb_interface *interface)
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{
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struct osif_priv *priv = usb_get_intfdata(interface);
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i2c_del_adapter(&(priv->adapter));
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usb_set_intfdata(interface, NULL);
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usb_put_dev(priv->usb_dev);
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}
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static struct usb_driver osif_driver = {
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.name = "RobotFuzz Open Source InterFace, OSIF",
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.probe = osif_probe,
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.disconnect = osif_disconnect,
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.id_table = osif_table,
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};
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module_usb_driver(osif_driver);
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MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>");
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MODULE_AUTHOR("Barry Carter <barry.carter@robotfuzz.com>");
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MODULE_DESCRIPTION("RobotFuzz OSIF driver");
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MODULE_LICENSE("GPL v2");
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