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author | Srikant Patnaik | 2015-01-11 12:28:04 +0530 |
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committer | Srikant Patnaik | 2015-01-11 12:28:04 +0530 |
commit | 871480933a1c28f8a9fed4c4d34d06c439a7a422 (patch) | |
tree | 8718f573808810c2a1e8cb8fb6ac469093ca2784 /drivers/usb/serial/ezusb.c | |
parent | 9d40ac5867b9aefe0722bc1f110b965ff294d30d (diff) | |
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Moved, renamed, and deleted files
The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.
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 00000000..3cfc762f --- /dev/null +++ b/drivers/usb/serial/ezusb.c @@ -0,0 +1,61 @@ +/* + * 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/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 <linux/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 request) +{ + int result; + unsigned char *transfer_buffer; + + /* dbg("ezusb_writememory %x, %d", address, length); */ + if (!serial->dev) { + printk(KERN_ERR "ezusb: %s - no physical device present, " + "failing.\n", __func__); + return -ENODEV; + } + + transfer_buffer = kmemdup(data, length, GFP_KERNEL); + if (!transfer_buffer) { + dev_err(&serial->dev->dev, "%s - kmalloc(%d) failed.\n", + __func__, length); + return -ENOMEM; + } + result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), + request, 0x40, address, 0, transfer_buffer, length, 3000); + kfree(transfer_buffer); + return result; +} +EXPORT_SYMBOL_GPL(ezusb_writememory); + +int ezusb_set_reset(struct usb_serial *serial, unsigned char reset_bit) +{ + int response; + + /* dbg("%s - %d", __func__, reset_bit); */ + response = ezusb_writememory(serial, CPUCS_REG, &reset_bit, 1, 0xa0); + if (response < 0) + dev_err(&serial->dev->dev, "%s- %d failed\n", + __func__, reset_bit); + return response; +} +EXPORT_SYMBOL_GPL(ezusb_set_reset); + |