diff options
| author | Jonathan Herman <hermanjl@cs.unc.edu> | 2013-01-22 10:38:37 -0500 |
|---|---|---|
| committer | Jonathan Herman <hermanjl@cs.unc.edu> | 2013-01-22 10:38:37 -0500 |
| commit | fcc9d2e5a6c89d22b8b773a64fb4ad21ac318446 (patch) | |
| tree | a57612d1888735a2ec7972891b68c1ac5ec8faea /drivers/usb/serial/ezusb.c | |
| parent | 8dea78da5cee153b8af9c07a2745f6c55057fe12 (diff) | |
Diffstat (limited to 'drivers/usb/serial/ezusb.c')
| -rw-r--r-- | drivers/usb/serial/ezusb.c | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/drivers/usb/serial/ezusb.c b/drivers/usb/serial/ezusb.c new file mode 100644 index 00000000000..3cfc762f505 --- /dev/null +++ b/drivers/usb/serial/ezusb.c | |||
| @@ -0,0 +1,61 @@ | |||
| 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 | |||
| 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> | ||
| 18 | #include <linux/usb/serial.h> | ||
| 19 | |||
| 20 | /* EZ-USB Control and Status Register. Bit 0 controls 8051 reset */ | ||
| 21 | #define CPUCS_REG 0x7F92 | ||
| 22 | |||
| 23 | int ezusb_writememory(struct usb_serial *serial, int address, | ||
| 24 | unsigned char *data, int length, __u8 request) | ||
| 25 | { | ||
| 26 | int result; | ||
| 27 | unsigned char *transfer_buffer; | ||
| 28 | |||
| 29 | /* dbg("ezusb_writememory %x, %d", address, length); */ | ||
| 30 | if (!serial->dev) { | ||
| 31 | printk(KERN_ERR "ezusb: %s - no physical device present, " | ||
| 32 | "failing.\n", __func__); | ||
| 33 | return -ENODEV; | ||
| 34 | } | ||
| 35 | |||
| 36 | transfer_buffer = kmemdup(data, length, GFP_KERNEL); | ||
| 37 | if (!transfer_buffer) { | ||
| 38 | dev_err(&serial->dev->dev, "%s - kmalloc(%d) failed.\n", | ||
| 39 | __func__, length); | ||
| 40 | return -ENOMEM; | ||
| 41 | } | ||
| 42 | result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), | ||
| 43 | request, 0x40, address, 0, transfer_buffer, length, 3000); | ||
| 44 | kfree(transfer_buffer); | ||
| 45 | return result; | ||
| 46 | } | ||
| 47 | EXPORT_SYMBOL_GPL(ezusb_writememory); | ||
| 48 | |||
| 49 | int ezusb_set_reset(struct usb_serial *serial, unsigned char reset_bit) | ||
| 50 | { | ||
| 51 | int response; | ||
| 52 | |||
| 53 | /* dbg("%s - %d", __func__, reset_bit); */ | ||
| 54 | response = ezusb_writememory(serial, CPUCS_REG, &reset_bit, 1, 0xa0); | ||
| 55 | if (response < 0) | ||
| 56 | dev_err(&serial->dev->dev, "%s- %d failed\n", | ||
| 57 | __func__, reset_bit); | ||
| 58 | return response; | ||
| 59 | } | ||
| 60 | EXPORT_SYMBOL_GPL(ezusb_set_reset); | ||
| 61 | |||