diff options
Diffstat (limited to 'drivers/usb/serial/ezusb.c')
| -rw-r--r-- | drivers/usb/serial/ezusb.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/drivers/usb/serial/ezusb.c b/drivers/usb/serial/ezusb.c new file mode 100644 index 000000000000..1e419c8d7392 --- /dev/null +++ b/drivers/usb/serial/ezusb.c @@ -0,0 +1,60 @@ +/* + * EZ-USB specific functions used by some of the USB to Serial drivers. + * + * Copyright (C) 1999 - 2002 Greg Kroah-Hartman (greg@kroah.com) + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License version + * 2 as published by the Free Software Foundation. + */ + +#include <linux/config.h> +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/tty.h> +#include <linux/module.h> +#include <linux/usb.h> +#include "usb-serial.h" + +/* EZ-USB Control and Status Register. Bit 0 controls 8051 reset */ +#define CPUCS_REG 0x7F92 + +int ezusb_writememory (struct usb_serial *serial, int address, unsigned char *data, int length, __u8 bRequest) +{ + int result; + unsigned char *transfer_buffer; + + /* dbg("ezusb_writememory %x, %d", address, length); */ + if (!serial->dev) { + err("%s - no physical device present, failing.", __FUNCTION__); + return -ENODEV; + } + + transfer_buffer = kmalloc (length, GFP_KERNEL); + if (!transfer_buffer) { + dev_err(&serial->dev->dev, "%s - kmalloc(%d) failed.\n", __FUNCTION__, length); + return -ENOMEM; + } + memcpy (transfer_buffer, data, length); + result = usb_control_msg (serial->dev, usb_sndctrlpipe(serial->dev, 0), bRequest, 0x40, address, 0, transfer_buffer, length, 3000); + kfree (transfer_buffer); + return result; +} + +int ezusb_set_reset (struct usb_serial *serial, unsigned char reset_bit) +{ + int response; + + /* dbg("%s - %d", __FUNCTION__, reset_bit); */ + response = ezusb_writememory (serial, CPUCS_REG, &reset_bit, 1, 0xa0); + if (response < 0) + dev_err(&serial->dev->dev, "%s- %d failed\n", __FUNCTION__, reset_bit); + return response; +} + + +EXPORT_SYMBOL(ezusb_writememory); +EXPORT_SYMBOL(ezusb_set_reset); + |