// SPDX-License-Identifier: GPL-2.0-only /* * driver for the i2c-tiny-usb adapter - 1.0 * http://www.harbaum.org/till/i2c_tiny_usb * * Copyright (C) 2006-2007 Till Harbaum ([email protected]) */ #include <linux/kernel.h> #include <linux/errno.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/types.h> /* include interfaces to usb layer */ #include <linux/usb.h> /* include interface to i2c layer */ #include <linux/i2c.h> /* commands via USB, must match command ids in the firmware */ #define CMD_ECHO … #define CMD_GET_FUNC … #define CMD_SET_DELAY … #define CMD_GET_STATUS … #define CMD_I2C_IO … #define CMD_I2C_IO_BEGIN … #define CMD_I2C_IO_END … /* i2c bit delay, default is 10us -> 100kHz max (in practice, due to additional delays in the i2c bitbanging code this results in a i2c clock of about 50kHz) */ static unsigned short delay = …; module_param(delay, ushort, 0); MODULE_PARM_DESC(…) …; static int usb_read(struct i2c_adapter *adapter, int cmd, int value, int index, void *data, int len); static int usb_write(struct i2c_adapter *adapter, int cmd, int value, int index, void *data, int len); /* ----- begin of i2c layer ---------------------------------------------- */ #define STATUS_IDLE … #define STATUS_ADDRESS_ACK … #define STATUS_ADDRESS_NAK … static int usb_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num) { … } static u32 usb_func(struct i2c_adapter *adapter) { … } /* This is the actual algorithm we define */ static const struct i2c_algorithm usb_algorithm = …; /* ----- end of i2c layer ------------------------------------------------ */ /* ----- begin of usb layer ---------------------------------------------- */ /* * Initially the usb i2c interface uses a vid/pid pair donated by * Future Technology Devices International Ltd., later a pair was * bought from EZPrototypes */ static const struct usb_device_id i2c_tiny_usb_table[] = …; MODULE_DEVICE_TABLE(usb, i2c_tiny_usb_table); /* Structure to hold all of our device specific stuff */ struct i2c_tiny_usb { … }; static int usb_read(struct i2c_adapter *adapter, int cmd, int value, int index, void *data, int len) { … } static int usb_write(struct i2c_adapter *adapter, int cmd, int value, int index, void *data, int len) { … } static void i2c_tiny_usb_free(struct i2c_tiny_usb *dev) { … } static int i2c_tiny_usb_probe(struct usb_interface *interface, const struct usb_device_id *id) { … } static void i2c_tiny_usb_disconnect(struct usb_interface *interface) { … } static struct usb_driver i2c_tiny_usb_driver = …; module_usb_driver(…) …; /* ----- end of usb layer ------------------------------------------------ */ MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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