// SPDX-License-Identifier: GPL-2.0-only /* * Driver for the Diolan u2c-12 USB-I2C adapter * * Copyright (c) 2010-2011 Ericsson AB * * Derived from: * i2c-tiny-usb.c * Copyright (C) 2006-2007 Till Harbaum ([email protected]) */ #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 … #define USB_VENDOR_ID_DIOLAN … #define USB_DEVICE_ID_DIOLAN_U2C … /* commands via USB, must match command ids in the firmware */ #define CMD_I2C_READ … #define CMD_I2C_WRITE … #define CMD_I2C_SCAN … #define CMD_I2C_RELEASE_SDA … #define CMD_I2C_RELEASE_SCL … #define CMD_I2C_DROP_SDA … #define CMD_I2C_DROP_SCL … #define CMD_I2C_READ_SDA … #define CMD_I2C_READ_SCL … #define CMD_GET_FW_VERSION … #define CMD_GET_SERIAL … #define CMD_I2C_START … #define CMD_I2C_STOP … #define CMD_I2C_REPEATED_START … #define CMD_I2C_PUT_BYTE … #define CMD_I2C_GET_BYTE … #define CMD_I2C_PUT_ACK … #define CMD_I2C_GET_ACK … #define CMD_I2C_PUT_BYTE_ACK … #define CMD_I2C_GET_BYTE_ACK … #define CMD_I2C_SET_SPEED … #define CMD_I2C_GET_SPEED … #define CMD_I2C_SET_CLK_SYNC … #define CMD_I2C_GET_CLK_SYNC … #define CMD_I2C_SET_CLK_SYNC_TO … #define CMD_I2C_GET_CLK_SYNC_TO … #define RESP_OK … #define RESP_FAILED … #define RESP_BAD_MEMADDR … #define RESP_DATA_ERR … #define RESP_NOT_IMPLEMENTED … #define RESP_NACK … #define RESP_TIMEOUT … #define U2C_I2C_SPEED_FAST … #define U2C_I2C_SPEED_STD … #define U2C_I2C_SPEED_2KHZ … #define U2C_I2C_SPEED(f) … #define U2C_I2C_FREQ(s) … #define DIOLAN_USB_TIMEOUT … #define DIOLAN_SYNC_TIMEOUT … #define DIOLAN_OUTBUF_LEN … #define DIOLAN_FLUSH_LEN … #define DIOLAN_INBUF_LEN … /* Structure to hold all of our device specific stuff */ struct i2c_diolan_u2c { … }; static uint frequency = …; /* I2C clock frequency in Hz */ module_param(frequency, uint, S_IRUGO | S_IWUSR); MODULE_PARM_DESC(…) …; /* usb layer */ /* Send command to device, and get response. */ static int diolan_usb_transfer(struct i2c_diolan_u2c *dev) { … } static int diolan_write_cmd(struct i2c_diolan_u2c *dev, bool flush) { … } /* Send command (no data) */ static int diolan_usb_cmd(struct i2c_diolan_u2c *dev, u8 command, bool flush) { … } /* Send command with one byte of data */ static int diolan_usb_cmd_data(struct i2c_diolan_u2c *dev, u8 command, u8 data, bool flush) { … } /* Send command with two bytes of data */ static int diolan_usb_cmd_data2(struct i2c_diolan_u2c *dev, u8 command, u8 d1, u8 d2, bool flush) { … } /* * Flush input queue. * If we don't do this at startup and the controller has queued up * messages which were not retrieved, it will stop responding * at some point. */ static void diolan_flush_input(struct i2c_diolan_u2c *dev) { … } static int diolan_i2c_start(struct i2c_diolan_u2c *dev) { … } static int diolan_i2c_repeated_start(struct i2c_diolan_u2c *dev) { … } static int diolan_i2c_stop(struct i2c_diolan_u2c *dev) { … } static int diolan_i2c_get_byte_ack(struct i2c_diolan_u2c *dev, bool ack, u8 *byte) { … } static int diolan_i2c_put_byte_ack(struct i2c_diolan_u2c *dev, u8 byte) { … } static int diolan_set_speed(struct i2c_diolan_u2c *dev, u8 speed) { … } /* Enable or disable clock synchronization (stretching) */ static int diolan_set_clock_synch(struct i2c_diolan_u2c *dev, bool enable) { … } /* Set clock synchronization timeout in ms */ static int diolan_set_clock_synch_timeout(struct i2c_diolan_u2c *dev, int ms) { … } static void diolan_fw_version(struct i2c_diolan_u2c *dev) { … } static void diolan_get_serial(struct i2c_diolan_u2c *dev) { … } static int diolan_init(struct i2c_diolan_u2c *dev) { … } /* i2c layer */ static int diolan_usb_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num) { … } /* * Return list of supported functionality. */ static u32 diolan_usb_func(struct i2c_adapter *a) { … } static const struct i2c_algorithm diolan_usb_algorithm = …; /* device layer */ static const struct usb_device_id diolan_u2c_table[] = …; MODULE_DEVICE_TABLE(usb, diolan_u2c_table); static void diolan_u2c_free(struct i2c_diolan_u2c *dev) { … } static int diolan_u2c_probe(struct usb_interface *interface, const struct usb_device_id *id) { … } static void diolan_u2c_disconnect(struct usb_interface *interface) { … } static struct usb_driver diolan_u2c_driver = …; module_usb_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
Codebase Browser
linux