2 * EZ-USB specific functions used by some of the USB to Serial drivers.
4 * Copyright (C) 1999 - 2002 Greg Kroah-Hartman (greg@kroah.com)
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License version
8 * 2 as published by the Free Software Foundation.
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/slab.h>
14 #include <linux/module.h>
15 #include <linux/usb.h>
17 /* EZ-USB Control and Status Register. Bit 0 controls 8051 reset */
18 #define CPUCS_REG 0x7F92
20 /* Command for writing to internal memory */
21 #define WRITE_INT_RAM 0xA0
23 int ezusb_writememory(struct usb_device
*dev
, int address
,
24 unsigned char *data
, int length
, __u8 request
)
27 unsigned char *transfer_buffer
;
30 printk(KERN_ERR
"ezusb: %s - no physical device present, "
31 "failing.\n", __func__
);
35 transfer_buffer
= kmemdup(data
, length
, GFP_KERNEL
);
36 if (!transfer_buffer
) {
37 dev_err(&dev
->dev
, "%s - kmalloc(%d) failed.\n",
41 result
= usb_control_msg(dev
, usb_sndctrlpipe(dev
, 0), request
,
42 USB_DIR_OUT
| USB_TYPE_VENDOR
| USB_RECIP_DEVICE
,
43 address
, 0, transfer_buffer
, length
, 3000);
45 kfree(transfer_buffer
);
48 EXPORT_SYMBOL_GPL(ezusb_writememory
);
50 int ezusb_set_reset(struct usb_device
*dev
, unsigned char reset_bit
)
52 int response
= ezusb_writememory(dev
, CPUCS_REG
, &reset_bit
, 1, WRITE_INT_RAM
);
54 dev_err(&dev
->dev
, "%s-%d failed: %d\n",
55 __func__
, reset_bit
, response
);
58 EXPORT_SYMBOL_GPL(ezusb_set_reset
);