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https://github.com/torvalds/linux
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ced6a0ba26
The newer usb_control_msg_{send|recv}() API ensures that a short read is
treated as an error, data can be used off the stack, and raw usb pipes need
not be created in the calling functions.
For this reason, the instance of usb_control_msg() has been replaced with
usb_control_msg_send() appropriately.
Reviewed-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Anant Thazhemadam <anant.thazhemadam@gmail.com>
Link: https://lore.kernel.org/r/20210326223251.753952-3-anant.thazhemadam@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
152 lines
4.1 KiB
C
152 lines
4.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* EZ-USB specific functions used by some of the USB to Serial drivers.
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*
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* Copyright (C) 1999 - 2002 Greg Kroah-Hartman (greg@kroah.com)
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/usb.h>
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#include <linux/firmware.h>
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#include <linux/ihex.h>
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#include <linux/usb/ezusb.h>
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struct ezusb_fx_type {
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/* EZ-USB Control and Status Register. Bit 0 controls 8051 reset */
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unsigned short cpucs_reg;
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unsigned short max_internal_adress;
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};
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static const struct ezusb_fx_type ezusb_fx1 = {
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.cpucs_reg = 0x7F92,
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.max_internal_adress = 0x1B3F,
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};
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/* Commands for writing to memory */
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#define WRITE_INT_RAM 0xA0
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#define WRITE_EXT_RAM 0xA3
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static int ezusb_writememory(struct usb_device *dev, int address,
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unsigned char *data, int length, __u8 request)
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{
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if (!dev)
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return -ENODEV;
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return usb_control_msg_send(dev, 0, request,
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USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
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address, 0, data, length, 3000, GFP_KERNEL);
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}
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static int ezusb_set_reset(struct usb_device *dev, unsigned short cpucs_reg,
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unsigned char reset_bit)
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{
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int response = ezusb_writememory(dev, cpucs_reg, &reset_bit, 1, WRITE_INT_RAM);
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if (response < 0)
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dev_err(&dev->dev, "%s-%d failed: %d\n",
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__func__, reset_bit, response);
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return response;
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}
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int ezusb_fx1_set_reset(struct usb_device *dev, unsigned char reset_bit)
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{
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return ezusb_set_reset(dev, ezusb_fx1.cpucs_reg, reset_bit);
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}
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EXPORT_SYMBOL_GPL(ezusb_fx1_set_reset);
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static int ezusb_ihex_firmware_download(struct usb_device *dev,
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struct ezusb_fx_type fx,
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const char *firmware_path)
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{
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int ret = -ENOENT;
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const struct firmware *firmware = NULL;
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const struct ihex_binrec *record;
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if (request_ihex_firmware(&firmware, firmware_path,
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&dev->dev)) {
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dev_err(&dev->dev,
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"%s - request \"%s\" failed\n",
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__func__, firmware_path);
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goto out;
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}
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ret = ezusb_set_reset(dev, fx.cpucs_reg, 0);
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if (ret < 0)
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goto out;
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record = (const struct ihex_binrec *)firmware->data;
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for (; record; record = ihex_next_binrec(record)) {
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if (be32_to_cpu(record->addr) > fx.max_internal_adress) {
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ret = ezusb_writememory(dev, be32_to_cpu(record->addr),
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(unsigned char *)record->data,
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be16_to_cpu(record->len), WRITE_EXT_RAM);
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if (ret < 0) {
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dev_err(&dev->dev, "%s - ezusb_writememory "
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"failed writing internal memory "
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"(%d %04X %p %d)\n", __func__, ret,
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be32_to_cpu(record->addr), record->data,
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be16_to_cpu(record->len));
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goto out;
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}
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}
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}
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ret = ezusb_set_reset(dev, fx.cpucs_reg, 1);
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if (ret < 0)
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goto out;
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record = (const struct ihex_binrec *)firmware->data;
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for (; record; record = ihex_next_binrec(record)) {
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if (be32_to_cpu(record->addr) <= fx.max_internal_adress) {
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ret = ezusb_writememory(dev, be32_to_cpu(record->addr),
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(unsigned char *)record->data,
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be16_to_cpu(record->len), WRITE_INT_RAM);
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if (ret < 0) {
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dev_err(&dev->dev, "%s - ezusb_writememory "
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"failed writing external memory "
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"(%d %04X %p %d)\n", __func__, ret,
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be32_to_cpu(record->addr), record->data,
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be16_to_cpu(record->len));
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goto out;
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}
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}
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}
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ret = ezusb_set_reset(dev, fx.cpucs_reg, 0);
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out:
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release_firmware(firmware);
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return ret;
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}
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int ezusb_fx1_ihex_firmware_download(struct usb_device *dev,
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const char *firmware_path)
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{
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return ezusb_ihex_firmware_download(dev, ezusb_fx1, firmware_path);
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}
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EXPORT_SYMBOL_GPL(ezusb_fx1_ihex_firmware_download);
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#if 0
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/*
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* Once someone one needs these fx2 functions, uncomment them
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* and add them to ezusb.h and all should be good.
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*/
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static struct ezusb_fx_type ezusb_fx2 = {
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.cpucs_reg = 0xE600,
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.max_internal_adress = 0x3FFF,
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};
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int ezusb_fx2_set_reset(struct usb_device *dev, unsigned char reset_bit)
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{
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return ezusb_set_reset(dev, ezusb_fx2.cpucs_reg, reset_bit);
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}
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EXPORT_SYMBOL_GPL(ezusb_fx2_set_reset);
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int ezusb_fx2_ihex_firmware_download(struct usb_device *dev,
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const char *firmware_path)
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{
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return ezusb_ihex_firmware_download(dev, ezusb_fx2, firmware_path);
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}
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EXPORT_SYMBOL_GPL(ezusb_fx2_ihex_firmware_download);
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#endif
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MODULE_LICENSE("GPL");
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