+++ /dev/null
-/*
- * Atmel SAM Boot Assistant (SAM-BA) driver
- *
- * Copyright (C) 2010 Johan Hovold <jhovold@gmail.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/tty.h>
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/usb.h>
-#include <linux/usb/serial.h>
-
-
-#define DRIVER_VERSION "v1.0"
-#define DRIVER_AUTHOR "Johan Hovold <jhovold@gmail.com>"
-#define DRIVER_DESC "Atmel SAM Boot Assistant (SAM-BA) driver"
-
-#define SAMBA_VENDOR_ID 0x3eb
-#define SAMBA_PRODUCT_ID 0x6124
-
-
-static int debug;
-
-static const struct usb_device_id id_table[] = {
- /*
- * NOTE: Only match the CDC Data interface.
- */
- { USB_DEVICE_AND_INTERFACE_INFO(SAMBA_VENDOR_ID, SAMBA_PRODUCT_ID,
- USB_CLASS_CDC_DATA, 0, 0) },
- { }
-};
-MODULE_DEVICE_TABLE(usb, id_table);
-
-static struct usb_driver samba_driver = {
- .name = "sam-ba",
- .probe = usb_serial_probe,
- .disconnect = usb_serial_disconnect,
- .id_table = id_table,
- .no_dynamic_id = 1,
-};
-
-
-/*
- * NOTE: The SAM-BA firmware cannot handle merged write requests so we cannot
- * use the generic write implementation (which uses the port write fifo).
- */
-static int samba_write(struct tty_struct *tty, struct usb_serial_port *port,
- const unsigned char *buf, int count)
-{
- struct urb *urb;
- unsigned long flags;
- int result;
- int i;
-
- if (!count)
- return 0;
-
- count = min_t(int, count, port->bulk_out_size);
-
- spin_lock_irqsave(&port->lock, flags);
- if (!port->write_urbs_free) {
- spin_unlock_irqrestore(&port->lock, flags);
- return 0;
- }
- i = find_first_bit(&port->write_urbs_free,
- ARRAY_SIZE(port->write_urbs));
- __clear_bit(i, &port->write_urbs_free);
- port->tx_bytes += count;
- spin_unlock_irqrestore(&port->lock, flags);
-
- urb = port->write_urbs[i];
- memcpy(urb->transfer_buffer, buf, count);
- urb->transfer_buffer_length = count;
- usb_serial_debug_data(debug, &port->dev, __func__, count,
- urb->transfer_buffer);
- result = usb_submit_urb(urb, GFP_ATOMIC);
- if (result) {
- dev_err(&port->dev, "%s - error submitting urb: %d\n",
- __func__, result);
- spin_lock_irqsave(&port->lock, flags);
- __set_bit(i, &port->write_urbs_free);
- port->tx_bytes -= count;
- spin_unlock_irqrestore(&port->lock, flags);
-
- return result;
- }
-
- return count;
-}
-
-static int samba_write_room(struct tty_struct *tty)
-{
- struct usb_serial_port *port = tty->driver_data;
- unsigned long flags;
- unsigned long free;
- int count;
- int room;
-
- spin_lock_irqsave(&port->lock, flags);
- free = port->write_urbs_free;
- spin_unlock_irqrestore(&port->lock, flags);
-
- count = hweight_long(free);
- room = count * port->bulk_out_size;
-
- dbg("%s - returns %d", __func__, room);
-
- return room;
-}
-
-static int samba_chars_in_buffer(struct tty_struct *tty)
-{
- struct usb_serial_port *port = tty->driver_data;
- unsigned long flags;
- int chars;
-
- spin_lock_irqsave(&port->lock, flags);
- chars = port->tx_bytes;
- spin_unlock_irqrestore(&port->lock, flags);
-
- dbg("%s - returns %d", __func__, chars);
-
- return chars;
-}
-
-static void samba_write_bulk_callback(struct urb *urb)
-{
- struct usb_serial_port *port = urb->context;
- unsigned long flags;
- int i;
-
- dbg("%s - port %d", __func__, port->number);
-
- for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i) {
- if (port->write_urbs[i] == urb)
- break;
- }
- spin_lock_irqsave(&port->lock, flags);
- __set_bit(i, &port->write_urbs_free);
- port->tx_bytes -= urb->transfer_buffer_length;
- spin_unlock_irqrestore(&port->lock, flags);
-
- if (urb->status)
- dbg("%s - non-zero urb status: %d", __func__, urb->status);
-
- usb_serial_port_softint(port);
-}
-
-static struct usb_serial_driver samba_device = {
- .driver = {
- .owner = THIS_MODULE,
- .name = "sam-ba",
- },
- .usb_driver = &samba_driver,
- .id_table = id_table,
- .num_ports = 1,
- .bulk_in_size = 512,
- .bulk_out_size = 2048,
- .write = samba_write,
- .write_room = samba_write_room,
- .chars_in_buffer = samba_chars_in_buffer,
- .write_bulk_callback = samba_write_bulk_callback,
- .throttle = usb_serial_generic_throttle,
- .unthrottle = usb_serial_generic_unthrottle,
-};
-
-static int __init samba_init(void)
-{
- int retval;
-
- retval = usb_serial_register(&samba_device);
- if (retval)
- return retval;
-
- retval = usb_register(&samba_driver);
- if (retval) {
- usb_serial_deregister(&samba_device);
- return retval;
- }
-
- printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ": "
- DRIVER_DESC "\n");
- return 0;
-}
-
-static void __exit samba_exit(void)
-{
- usb_deregister(&samba_driver);
- usb_serial_deregister(&samba_device);
-}
-
-module_init(samba_init);
-module_exit(samba_exit);
-
-MODULE_AUTHOR(DRIVER_AUTHOR);
-MODULE_DESCRIPTION(DRIVER_DESC);
-MODULE_VERSION(DRIVER_VERSION);
-MODULE_LICENSE("GPL");
-
-module_param(debug, bool, S_IRUGO | S_IWUSR);
-MODULE_PARM_DESC(debug, "Enable verbose debugging messages");
projects / cascardo / linux.git / commitdiff