forked from luck/tmp_suning_uos_patched
d9b1b78773
Every usb serial driver should have a pointer to the corresponding usb driver. So the usb serial core can add a new id not only to the usb serial driver, but also to the usb driver. Also the usb drivers of ark3116, mos7720 and mos7840 missed the flag no_dynamic_id=1. This is added now. Signed-off-by: Johannes Hölzl <johannes.hoelzl@gmx.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
632 lines
16 KiB
C
632 lines
16 KiB
C
/*
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* AIRcable USB Bluetooth Dongle Driver.
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*
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* Copyright (C) 2006 Manuel Francisco Naranjo (naranjo.manuel@gmail.com)
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* This program is free software; you can redistribute it and/or modify it under
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* the terms of the GNU General Public License version 2 as published by the
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* Free Software Foundation.
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*
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* The device works as an standard CDC device, it has 2 interfaces, the first
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* one is for firmware access and the second is the serial one.
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* The protocol is very simply, there are two posibilities reading or writing.
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* When writting the first urb must have a Header that starts with 0x20 0x29 the
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* next two bytes must say how much data will be sended.
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* When reading the process is almost equal except that the header starts with
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* 0x00 0x20.
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*
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* The device simply need some stuff to understand data comming from the usb
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* buffer: The First and Second byte is used for a Header, the Third and Fourth
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* tells the device the amount of information the package holds.
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* Packages are 60 bytes long Header Stuff.
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* When writting to the device the first two bytes of the header are 0x20 0x29
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* When reading the bytes are 0x00 0x20, or 0x00 0x10, there is an strange
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* situation, when too much data arrives to the device because it sends the data
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* but with out the header. I will use a simply hack to override this situation,
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* if there is data coming that does not contain any header, then that is data
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* that must go directly to the tty, as there is no documentation about if there
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* is any other control code, I will simply check for the first
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* one.
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*
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* The driver registers himself with the USB-serial core and the USB Core. I had
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* to implement a probe function agains USB-serial, because other way, the
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* driver was attaching himself to both interfaces. I have tryed with different
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* configurations of usb_serial_driver with out exit, only the probe function
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* could handle this correctly.
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*
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* I have taken some info from a Greg Kroah-Hartman article:
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* http://www.linuxjournal.com/article/6573
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* And from Linux Device Driver Kit CD, which is a great work, the authors taken
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* the work to recompile lots of information an knowladge in drivers development
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* and made it all avaible inside a cd.
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* URL: http://kernel.org/pub/linux/kernel/people/gregkh/ddk/
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*
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*/
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#include <linux/tty.h>
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#include <linux/tty_flip.h>
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#include <linux/circ_buf.h>
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#include <linux/usb.h>
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#include <linux/usb/serial.h>
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static int debug;
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/* Vendor and Product ID */
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#define AIRCABLE_VID 0x16CA
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#define AIRCABLE_USB_PID 0x1502
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/* write buffer size defines */
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#define AIRCABLE_BUF_SIZE 2048
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/* Protocol Stuff */
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#define HCI_HEADER_LENGTH 0x4
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#define TX_HEADER_0 0x20
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#define TX_HEADER_1 0x29
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#define RX_HEADER_0 0x00
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#define RX_HEADER_1 0x20
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#define MAX_HCI_FRAMESIZE 60
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#define HCI_COMPLETE_FRAME 64
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/* rx_flags */
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#define THROTTLED 0x01
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#define ACTUALLY_THROTTLED 0x02
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/*
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* Version Information
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*/
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#define DRIVER_VERSION "v1.0b2"
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#define DRIVER_AUTHOR "Naranjo, Manuel Francisco <naranjo.manuel@gmail.com>"
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#define DRIVER_DESC "AIRcable USB Driver"
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/* ID table that will be registered with USB core */
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static struct usb_device_id id_table [] = {
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{ USB_DEVICE(AIRCABLE_VID, AIRCABLE_USB_PID) },
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{ },
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};
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MODULE_DEVICE_TABLE(usb, id_table);
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/* Internal Structure */
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struct aircable_private {
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spinlock_t rx_lock; /* spinlock for the receive lines */
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struct circ_buf *tx_buf; /* write buffer */
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struct circ_buf *rx_buf; /* read buffer */
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int rx_flags; /* for throttilng */
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struct work_struct rx_work; /* work cue for the receiving line */
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struct usb_serial_port *port; /* USB port with which associated */
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};
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/* Private methods */
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/* Circular Buffer Methods, code from ti_usb_3410_5052 used */
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/*
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* serial_buf_clear
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*
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* Clear out all data in the circular buffer.
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*/
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static void serial_buf_clear(struct circ_buf *cb)
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{
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cb->head = cb->tail = 0;
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}
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/*
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* serial_buf_alloc
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*
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* Allocate a circular buffer and all associated memory.
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*/
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static struct circ_buf *serial_buf_alloc(void)
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{
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struct circ_buf *cb;
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cb = kmalloc(sizeof(struct circ_buf), GFP_KERNEL);
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if (cb == NULL)
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return NULL;
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cb->buf = kmalloc(AIRCABLE_BUF_SIZE, GFP_KERNEL);
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if (cb->buf == NULL) {
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kfree(cb);
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return NULL;
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}
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serial_buf_clear(cb);
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return cb;
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}
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/*
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* serial_buf_free
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*
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* Free the buffer and all associated memory.
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*/
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static void serial_buf_free(struct circ_buf *cb)
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{
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kfree(cb->buf);
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kfree(cb);
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}
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/*
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* serial_buf_data_avail
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*
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* Return the number of bytes of data available in the circular
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* buffer.
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*/
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static int serial_buf_data_avail(struct circ_buf *cb)
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{
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return CIRC_CNT(cb->head,cb->tail,AIRCABLE_BUF_SIZE);
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}
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/*
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* serial_buf_put
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*
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* Copy data data from a user buffer and put it into the circular buffer.
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* Restrict to the amount of space available.
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*
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* Return the number of bytes copied.
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*/
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static int serial_buf_put(struct circ_buf *cb, const char *buf, int count)
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{
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int c, ret = 0;
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while (1) {
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c = CIRC_SPACE_TO_END(cb->head, cb->tail, AIRCABLE_BUF_SIZE);
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if (count < c)
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c = count;
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if (c <= 0)
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break;
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memcpy(cb->buf + cb->head, buf, c);
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cb->head = (cb->head + c) & (AIRCABLE_BUF_SIZE-1);
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buf += c;
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count -= c;
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ret= c;
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}
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return ret;
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}
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/*
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* serial_buf_get
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*
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* Get data from the circular buffer and copy to the given buffer.
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* Restrict to the amount of data available.
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*
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* Return the number of bytes copied.
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*/
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static int serial_buf_get(struct circ_buf *cb, char *buf, int count)
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{
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int c, ret = 0;
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while (1) {
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c = CIRC_CNT_TO_END(cb->head, cb->tail, AIRCABLE_BUF_SIZE);
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if (count < c)
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c = count;
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if (c <= 0)
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break;
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memcpy(buf, cb->buf + cb->tail, c);
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cb->tail = (cb->tail + c) & (AIRCABLE_BUF_SIZE-1);
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buf += c;
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count -= c;
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ret= c;
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}
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return ret;
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}
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/* End of circula buffer methods */
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static void aircable_send(struct usb_serial_port *port)
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{
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int count, result;
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struct aircable_private *priv = usb_get_serial_port_data(port);
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unsigned char* buf;
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dbg("%s - port %d", __FUNCTION__, port->number);
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if (port->write_urb_busy)
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return;
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count = min(serial_buf_data_avail(priv->tx_buf), MAX_HCI_FRAMESIZE);
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if (count == 0)
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return;
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buf = kzalloc(count + HCI_HEADER_LENGTH, GFP_ATOMIC);
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if (!buf) {
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err("%s- kzalloc(%d) failed.", __FUNCTION__,
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count + HCI_HEADER_LENGTH);
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return;
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}
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buf[0] = TX_HEADER_0;
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buf[1] = TX_HEADER_1;
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buf[2] = (unsigned char)count;
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buf[3] = (unsigned char)(count >> 8);
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serial_buf_get(priv->tx_buf,buf + HCI_HEADER_LENGTH, MAX_HCI_FRAMESIZE);
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memcpy(port->write_urb->transfer_buffer, buf,
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count + HCI_HEADER_LENGTH);
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kfree(buf);
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port->write_urb_busy = 1;
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usb_serial_debug_data(debug, &port->dev, __FUNCTION__,
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count + HCI_HEADER_LENGTH,
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port->write_urb->transfer_buffer);
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port->write_urb->transfer_buffer_length = count + HCI_HEADER_LENGTH;
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port->write_urb->dev = port->serial->dev;
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result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
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if (result) {
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dev_err(&port->dev,
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"%s - failed submitting write urb, error %d\n",
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__FUNCTION__, result);
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port->write_urb_busy = 0;
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}
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schedule_work(&port->work);
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}
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static void aircable_read(struct work_struct *work)
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{
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struct aircable_private *priv =
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container_of(work, struct aircable_private, rx_work);
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struct usb_serial_port *port = priv->port;
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struct tty_struct *tty;
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unsigned char *data;
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int count;
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if (priv->rx_flags & THROTTLED){
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if (priv->rx_flags & ACTUALLY_THROTTLED)
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schedule_work(&priv->rx_work);
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return;
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}
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/* By now I will flush data to the tty in packages of no more than
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* 64 bytes, to ensure I do not get throttled.
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* Ask USB mailing list for better aproach.
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*/
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tty = port->tty;
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if (!tty) {
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schedule_work(&priv->rx_work);
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err("%s - No tty available", __FUNCTION__);
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return ;
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}
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count = min(64, serial_buf_data_avail(priv->rx_buf));
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if (count <= 0)
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return; //We have finished sending everything.
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tty_prepare_flip_string(tty, &data, count);
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if (!data){
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err("%s- kzalloc(%d) failed.", __FUNCTION__, count);
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return;
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}
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serial_buf_get(priv->rx_buf, data, count);
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tty_flip_buffer_push(tty);
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if (serial_buf_data_avail(priv->rx_buf))
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schedule_work(&priv->rx_work);
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return;
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}
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/* End of private methods */
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static int aircable_probe(struct usb_serial *serial,
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const struct usb_device_id *id)
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{
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struct usb_host_interface *iface_desc = serial->interface->cur_altsetting;
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struct usb_endpoint_descriptor *endpoint;
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int num_bulk_out=0;
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int i;
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for (i = 0; i < iface_desc->desc.bNumEndpoints; i++) {
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endpoint = &iface_desc->endpoint[i].desc;
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if (usb_endpoint_is_bulk_out(endpoint)) {
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dbg("found bulk out on endpoint %d", i);
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++num_bulk_out;
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}
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}
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if (num_bulk_out == 0) {
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dbg("Invalid interface, discarding");
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return -ENODEV;
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}
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return 0;
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}
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static int aircable_attach (struct usb_serial *serial)
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{
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struct usb_serial_port *port = serial->port[0];
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struct aircable_private *priv;
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priv = kzalloc(sizeof(struct aircable_private), GFP_KERNEL);
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if (!priv){
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err("%s- kmalloc(%Zd) failed.", __FUNCTION__,
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sizeof(struct aircable_private));
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return -ENOMEM;
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}
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/* Allocation of Circular Buffers */
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priv->tx_buf = serial_buf_alloc();
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if (priv->tx_buf == NULL) {
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kfree(priv);
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return -ENOMEM;
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}
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priv->rx_buf = serial_buf_alloc();
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if (priv->rx_buf == NULL) {
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kfree(priv->tx_buf);
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kfree(priv);
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return -ENOMEM;
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}
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priv->rx_flags &= ~(THROTTLED | ACTUALLY_THROTTLED);
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priv->port = port;
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INIT_WORK(&priv->rx_work, aircable_read);
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usb_set_serial_port_data(serial->port[0], priv);
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return 0;
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}
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static void aircable_shutdown(struct usb_serial *serial)
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{
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struct usb_serial_port *port = serial->port[0];
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struct aircable_private *priv = usb_get_serial_port_data(port);
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dbg("%s", __FUNCTION__);
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if (priv) {
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serial_buf_free(priv->tx_buf);
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serial_buf_free(priv->rx_buf);
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usb_set_serial_port_data(port, NULL);
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kfree(priv);
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}
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}
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static int aircable_write_room(struct usb_serial_port *port)
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{
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struct aircable_private *priv = usb_get_serial_port_data(port);
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return serial_buf_data_avail(priv->tx_buf);
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}
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static int aircable_write(struct usb_serial_port *port,
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const unsigned char *source, int count)
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{
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struct aircable_private *priv = usb_get_serial_port_data(port);
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int temp;
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dbg("%s - port %d, %d bytes", __FUNCTION__, port->number, count);
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usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, source);
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if (!count){
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dbg("%s - write request of 0 bytes", __FUNCTION__);
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return count;
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}
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temp = serial_buf_put(priv->tx_buf, source, count);
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aircable_send(port);
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if (count > AIRCABLE_BUF_SIZE)
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count = AIRCABLE_BUF_SIZE;
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return count;
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}
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static void aircable_write_bulk_callback(struct urb *urb)
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{
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struct usb_serial_port *port = urb->context;
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int result;
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dbg("%s - urb->status: %d", __FUNCTION__ , urb->status);
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/* This has been taken from cypress_m8.c cypress_write_int_callback */
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switch (urb->status) {
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case 0:
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/* success */
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break;
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case -ECONNRESET:
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case -ENOENT:
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case -ESHUTDOWN:
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/* this urb is terminated, clean up */
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dbg("%s - urb shutting down with status: %d",
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__FUNCTION__, urb->status);
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port->write_urb_busy = 0;
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return;
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default:
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/* error in the urb, so we have to resubmit it */
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dbg("%s - Overflow in write", __FUNCTION__);
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dbg("%s - nonzero write bulk status received: %d",
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__FUNCTION__, urb->status);
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port->write_urb->transfer_buffer_length = 1;
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port->write_urb->dev = port->serial->dev;
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result = usb_submit_urb(port->write_urb, GFP_KERNEL);
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if (result)
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dev_err(&urb->dev->dev,
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"%s - failed resubmitting write urb, error %d\n",
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__FUNCTION__, result);
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else
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return;
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}
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port->write_urb_busy = 0;
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aircable_send(port);
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}
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static void aircable_read_bulk_callback(struct urb *urb)
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{
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struct usb_serial_port *port = urb->context;
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struct aircable_private *priv = usb_get_serial_port_data(port);
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struct tty_struct *tty;
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unsigned long no_packages, remaining, package_length, i;
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int result, shift = 0;
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unsigned char *temp;
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dbg("%s - port %d", __FUNCTION__, port->number);
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if (urb->status) {
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dbg("%s - urb->status = %d", __FUNCTION__, urb->status);
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if (!port->open_count) {
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dbg("%s - port is closed, exiting.", __FUNCTION__);
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return;
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}
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if (urb->status == -EPROTO) {
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dbg("%s - caught -EPROTO, resubmitting the urb",
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__FUNCTION__);
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usb_fill_bulk_urb(port->read_urb, port->serial->dev,
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usb_rcvbulkpipe(port->serial->dev,
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port->bulk_in_endpointAddress),
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port->read_urb->transfer_buffer,
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port->read_urb->transfer_buffer_length,
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aircable_read_bulk_callback, port);
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result = usb_submit_urb(urb, GFP_ATOMIC);
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if (result)
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dev_err(&urb->dev->dev,
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"%s - failed resubmitting read urb, error %d\n",
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__FUNCTION__, result);
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return;
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}
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dbg("%s - unable to handle the error, exiting.", __FUNCTION__);
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return;
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}
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usb_serial_debug_data(debug, &port->dev, __FUNCTION__,
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urb->actual_length,urb->transfer_buffer);
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tty = port->tty;
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if (tty && urb->actual_length) {
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if (urb->actual_length <= 2) {
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/* This is an incomplete package */
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serial_buf_put(priv->rx_buf, urb->transfer_buffer,
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urb->actual_length);
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} else {
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temp = urb->transfer_buffer;
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if (temp[0] == RX_HEADER_0)
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shift = HCI_HEADER_LENGTH;
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remaining = urb->actual_length;
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no_packages = urb->actual_length / (HCI_COMPLETE_FRAME);
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if (urb->actual_length % HCI_COMPLETE_FRAME != 0)
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no_packages+=1;
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for (i = 0; i < no_packages ;i++) {
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if (remaining > (HCI_COMPLETE_FRAME))
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package_length = HCI_COMPLETE_FRAME;
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else
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package_length = remaining;
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remaining -= package_length;
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|
|
serial_buf_put(priv->rx_buf,
|
|
urb->transfer_buffer + shift +
|
|
(HCI_COMPLETE_FRAME) * (i),
|
|
package_length - shift);
|
|
}
|
|
}
|
|
aircable_read(&priv->rx_work);
|
|
}
|
|
|
|
/* Schedule the next read _if_ we are still open */
|
|
if (port->open_count) {
|
|
usb_fill_bulk_urb(port->read_urb, port->serial->dev,
|
|
usb_rcvbulkpipe(port->serial->dev,
|
|
port->bulk_in_endpointAddress),
|
|
port->read_urb->transfer_buffer,
|
|
port->read_urb->transfer_buffer_length,
|
|
aircable_read_bulk_callback, port);
|
|
|
|
result = usb_submit_urb(urb, GFP_ATOMIC);
|
|
if (result)
|
|
dev_err(&urb->dev->dev,
|
|
"%s - failed resubmitting read urb, error %d\n",
|
|
__FUNCTION__, result);
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
/* Based on ftdi_sio.c throttle */
|
|
static void aircable_throttle(struct usb_serial_port *port)
|
|
{
|
|
struct aircable_private *priv = usb_get_serial_port_data(port);
|
|
unsigned long flags;
|
|
|
|
dbg("%s - port %d", __FUNCTION__, port->number);
|
|
|
|
spin_lock_irqsave(&priv->rx_lock, flags);
|
|
priv->rx_flags |= THROTTLED;
|
|
spin_unlock_irqrestore(&priv->rx_lock, flags);
|
|
}
|
|
|
|
/* Based on ftdi_sio.c unthrottle */
|
|
static void aircable_unthrottle(struct usb_serial_port *port)
|
|
{
|
|
struct aircable_private *priv = usb_get_serial_port_data(port);
|
|
int actually_throttled;
|
|
unsigned long flags;
|
|
|
|
dbg("%s - port %d", __FUNCTION__, port->number);
|
|
|
|
spin_lock_irqsave(&priv->rx_lock, flags);
|
|
actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
|
|
priv->rx_flags &= ~(THROTTLED | ACTUALLY_THROTTLED);
|
|
spin_unlock_irqrestore(&priv->rx_lock, flags);
|
|
|
|
if (actually_throttled)
|
|
schedule_work(&priv->rx_work);
|
|
}
|
|
|
|
static struct usb_driver aircable_driver = {
|
|
.name = "aircable",
|
|
.probe = usb_serial_probe,
|
|
.disconnect = usb_serial_disconnect,
|
|
.id_table = id_table,
|
|
.no_dynamic_id = 1,
|
|
};
|
|
|
|
static struct usb_serial_driver aircable_device = {
|
|
.description = "aircable",
|
|
.usb_driver = &aircable_driver,
|
|
.id_table = id_table,
|
|
.num_ports = 1,
|
|
.attach = aircable_attach,
|
|
.probe = aircable_probe,
|
|
.shutdown = aircable_shutdown,
|
|
.write = aircable_write,
|
|
.write_room = aircable_write_room,
|
|
.write_bulk_callback = aircable_write_bulk_callback,
|
|
.read_bulk_callback = aircable_read_bulk_callback,
|
|
.throttle = aircable_throttle,
|
|
.unthrottle = aircable_unthrottle,
|
|
};
|
|
|
|
static int __init aircable_init (void)
|
|
{
|
|
int retval;
|
|
retval = usb_serial_register(&aircable_device);
|
|
if (retval)
|
|
goto failed_serial_register;
|
|
retval = usb_register(&aircable_driver);
|
|
if (retval)
|
|
goto failed_usb_register;
|
|
return 0;
|
|
|
|
failed_serial_register:
|
|
usb_serial_deregister(&aircable_device);
|
|
failed_usb_register:
|
|
return retval;
|
|
}
|
|
|
|
static void __exit aircable_exit (void)
|
|
{
|
|
usb_deregister(&aircable_driver);
|
|
usb_serial_deregister(&aircable_device);
|
|
}
|
|
|
|
MODULE_AUTHOR(DRIVER_AUTHOR);
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|
|
MODULE_VERSION(DRIVER_VERSION);
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(aircable_init);
|
|
module_exit(aircable_exit);
|
|
|
|
module_param(debug, bool, S_IRUGO | S_IWUSR);
|
|
MODULE_PARM_DESC(debug, "Debug enabled or not");
|