| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame] | 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 | |