linux/drivers/spi/spi-ch341.c

// SPDX-License-Identifier: GPL-2.0
//
// QiHeng Electronics ch341a USB-to-SPI adapter driver
//
// Copyright (C) 2024 Johannes Thumshirn <[email protected]>
//
// Based on ch341a_spi.c from the flashrom project.

#include <linux/module.h>
#include <linux/usb.h>
#include <linux/spi/spi.h>

#define CH341_PACKET_LENGTH …
#define CH341_DEFAULT_TIMEOUT …

#define CH341A_CMD_UIO_STREAM …

#define CH341A_CMD_UIO_STM_END …
#define CH341A_CMD_UIO_STM_DIR …
#define CH341A_CMD_UIO_STM_OUT …

#define CH341A_CMD_I2C_STREAM …
#define CH341A_CMD_I2C_STM_SET …
#define CH341A_CMD_I2C_STM_END …

#define CH341A_CMD_SPI_STREAM …

#define CH341A_STM_I2C_100K …

struct ch341_spi_dev { … };

static void ch341_set_cs(struct spi_device *spi, bool is_high)
{ … }

static int ch341_transfer_one(struct spi_controller *host,
			      struct spi_device *spi,
			      struct spi_transfer *trans)
{ … }

static void ch341_recv(struct urb *urb)
{ … }

static int ch341_config_stream(struct ch341_spi_dev *ch341)
{ … }

static int ch341_enable_pins(struct ch341_spi_dev *ch341, bool enable)
{ … }

static struct spi_board_info chip = …;

static int ch341_probe(struct usb_interface *intf,
		       const struct usb_device_id *id)
{ … }

static void ch341_disconnect(struct usb_interface *intf)
{ … }

static const struct usb_device_id ch341_id_table[] = …;
MODULE_DEVICE_TABLE(usb, ch341_id_table);

static struct usb_driver ch341a_usb_driver = …;
module_usb_driver(…) …;

MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;