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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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99495c7061
This patch removes the dependency on the usb_serial interface and names some magic constants Signed-off-by: René Bürgel <rene.buergel@sohard.de> -- Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
/*
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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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* 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 version
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* 2 as published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/init.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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/* EZ-USB Control and Status Register. Bit 0 controls 8051 reset */
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#define CPUCS_REG 0x7F92
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/* Command for writing to internal memory */
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#define WRITE_INT_RAM 0xA0
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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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int result;
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unsigned char *transfer_buffer;
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if (!dev) {
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printk(KERN_ERR "ezusb: %s - no physical device present, "
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"failing.\n", __func__);
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return -ENODEV;
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}
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transfer_buffer = kmemdup(data, length, GFP_KERNEL);
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if (!transfer_buffer) {
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dev_err(&dev->dev, "%s - kmalloc(%d) failed.\n",
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__func__, length);
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return -ENOMEM;
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}
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result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), request,
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USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
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address, 0, transfer_buffer, length, 3000);
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kfree(transfer_buffer);
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return result;
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}
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EXPORT_SYMBOL_GPL(ezusb_writememory);
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int ezusb_set_reset(struct usb_device *dev, 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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EXPORT_SYMBOL_GPL(ezusb_set_reset);
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