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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * EZ-USB specific functions used by some of the USB to Serial drivers. | |
3 | * | |
4 | * Copyright (C) 1999 - 2002 Greg Kroah-Hartman (greg@kroah.com) | |
5 | * | |
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. | |
9 | */ | |
10 | ||
1da177e4 LT |
11 | #include <linux/kernel.h> |
12 | #include <linux/errno.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/slab.h> | |
15 | #include <linux/tty.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/usb.h> | |
a969888c | 18 | #include <linux/usb/serial.h> |
1da177e4 LT |
19 | |
20 | /* EZ-USB Control and Status Register. Bit 0 controls 8051 reset */ | |
21 | #define CPUCS_REG 0x7F92 | |
22 | ||
80359a9c AC |
23 | int ezusb_writememory(struct usb_serial *serial, int address, |
24 | unsigned char *data, int length, __u8 request) | |
1da177e4 LT |
25 | { |
26 | int result; | |
27 | unsigned char *transfer_buffer; | |
28 | ||
1da177e4 | 29 | if (!serial->dev) { |
194343d9 GKH |
30 | printk(KERN_ERR "ezusb: %s - no physical device present, " |
31 | "failing.\n", __func__); | |
1da177e4 LT |
32 | return -ENODEV; |
33 | } | |
34 | ||
5d7efe5b | 35 | transfer_buffer = kmemdup(data, length, GFP_KERNEL); |
1da177e4 | 36 | if (!transfer_buffer) { |
80359a9c AC |
37 | dev_err(&serial->dev->dev, "%s - kmalloc(%d) failed.\n", |
38 | __func__, length); | |
1da177e4 LT |
39 | return -ENOMEM; |
40 | } | |
80359a9c AC |
41 | result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), |
42 | request, 0x40, address, 0, transfer_buffer, length, 3000); | |
43 | kfree(transfer_buffer); | |
1da177e4 LT |
44 | return result; |
45 | } | |
80359a9c | 46 | EXPORT_SYMBOL_GPL(ezusb_writememory); |
1da177e4 | 47 | |
80359a9c | 48 | int ezusb_set_reset(struct usb_serial *serial, unsigned char reset_bit) |
1da177e4 LT |
49 | { |
50 | int response; | |
51 | ||
80359a9c | 52 | response = ezusb_writememory(serial, CPUCS_REG, &reset_bit, 1, 0xa0); |
1da177e4 | 53 | if (response < 0) |
80359a9c AC |
54 | dev_err(&serial->dev->dev, "%s- %d failed\n", |
55 | __func__, reset_bit); | |
1da177e4 LT |
56 | return response; |
57 | } | |
7bd4b20c | 58 | EXPORT_SYMBOL_GPL(ezusb_set_reset); |
1da177e4 | 59 |