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Commit 90593899 authored by Johan Hovold's avatar Johan Hovold Committed by Greg Kroah-Hartman
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USB: sam-ba: add driver for Atmel SAM Boot Assistant (SAM-BA) 



Add new driver to access the SAM-BA boot application of Atmel AT91SAM
devices.

The SAM-BA firmware cannot handle merged write requests so we cannot use
the generic write implementation (which uses the port write fifo).

Tested with the SAM-BA 2.10 tools and an Atmel at91sam9260-ek.

Signed-off-by: default avatarJohan Hovold <jhovold@gmail.com>
Tested-by: default avatarPeter Korsgaard <jacmet@sunsite.dk>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent c6a76781

drivers/usb/serial/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -527,6 +527,15 @@ config USB_SERIAL_SAFE_PADDED 
	bool "USB Secure Encapsulated Driver - Padded"

	depends on USB_SERIAL_SAFE



config USB_SERIAL_SAMBA

	tristate "USB Atmel SAM Boot Assistant (SAM-BA) driver"

	help

	  Say Y here if you want to access the SAM-BA boot application of an

	  Atmel AT91SAM device.



	  To compile this driver as a module, choose M here: the

	  module will be called sam-ba.



config USB_SERIAL_SIEMENS_MPI

	tristate "USB Siemens MPI driver"

	help

drivers/usb/serial/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -48,6 +48,7 @@ obj-$(CONFIG_USB_SERIAL_PL2303) += pl2303.o 
obj-$(CONFIG_USB_SERIAL_QCAUX)			+= qcaux.o

obj-$(CONFIG_USB_SERIAL_QUALCOMM)		+= qcserial.o

obj-$(CONFIG_USB_SERIAL_SAFE)			+= safe_serial.o

obj-$(CONFIG_USB_SERIAL_SAMBA)			+= sam-ba.o

obj-$(CONFIG_USB_SERIAL_SIEMENS_MPI)		+= siemens_mpi.o

obj-$(CONFIG_USB_SERIAL_SIERRAWIRELESS)		+= sierra.o

obj-$(CONFIG_USB_SERIAL_SPCP8X5)		+= spcp8x5.o

drivers/usb/serial/sam-ba.c

0 → 100644
+206 −0
Original line number Diff line number Diff line 
/*

 * 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");