drivers/usb/serial/ipw.c

Source file repositories/reference/linux-study-clean/drivers/usb/serial/ipw.c

File Facts

System
Linux kernel
Corpus path
drivers/usb/serial/ipw.c
Extension
.c
Size
9208 bytes
Lines
313
Domain
Driver Families
Bucket
drivers/usb
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0+
/*
 * IPWireless 3G UMTS TDD Modem driver (USB connected)
 *
 *   Copyright (C) 2004 Roelf Diedericks <roelfd@inet.co.za>
 *   Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
 *
 * All information about the device was acquired using SnoopyPro
 * on MSFT's O/S, and examing the MSFT drivers' debug output
 * (insanely left _on_ in the enduser version)
 *
 * It was written out of frustration with the IPWireless USB modem
 * supplied by Axity3G/Sentech South Africa not supporting
 * Linux whatsoever.
 *
 * Nobody provided any proprietary information that was not already
 * available for this device.
 *
 * The modem adheres to the "3GPP TS  27.007 AT command set for 3G
 * User Equipment (UE)" standard, available from
 * http://www.3gpp.org/ftp/Specs/html-info/27007.htm
 *
 * The code was only tested the IPWireless handheld modem distributed
 * in South Africa by Sentech.
 *
 * It may work for Woosh Inc in .nz too, as it appears they use the
 * same kit.
 *
 * There is still some work to be done in terms of handling
 * DCD, DTR, RTS, CTS which are currently faked.
 * It's good enough for PPP at this point. It's based off all kinds of
 * code found in usb/serial and usb/class
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
#include <linux/uaccess.h>
#include "usb-wwan.h"

#define DRIVER_AUTHOR	"Roelf Diedericks"
#define DRIVER_DESC	"IPWireless tty driver"

#define IPW_TTY_MAJOR	240	/* real device node major id, experimental range */
#define IPW_TTY_MINORS	256	/* we support 256 devices, dunno why, it'd be insane :) */

#define USB_IPW_MAGIC	0x6d02	/* magic number for ipw struct */


/* Message sizes */
#define EVENT_BUFFER_SIZE	0xFF
#define CHAR2INT16(c1, c0)	(((u32)((c1) & 0xff) << 8) + (u32)((c0) & 0xff))

/* vendor/product pairs that are known work with this driver*/
#define IPW_VID		0x0bc3
#define IPW_PID		0x0001


/* Vendor commands: */

/* baud rates */
enum {
	ipw_sio_b256000 = 0x000e,
	ipw_sio_b128000 = 0x001d,
	ipw_sio_b115200 = 0x0020,
	ipw_sio_b57600  = 0x0040,
	ipw_sio_b56000  = 0x0042,
	ipw_sio_b38400  = 0x0060,
	ipw_sio_b19200  = 0x00c0,
	ipw_sio_b14400  = 0x0100,
	ipw_sio_b9600   = 0x0180,
	ipw_sio_b4800   = 0x0300,
	ipw_sio_b2400   = 0x0600,
	ipw_sio_b1200   = 0x0c00,
	ipw_sio_b600    = 0x1800
};

/* data bits */
#define ipw_dtb_7		0x700
#define ipw_dtb_8		0x810	/* ok so the define is misleading, I know, but forces 8,n,1 */
					/* I mean, is there a point to any other setting these days? :) */

/* usb control request types : */
#define IPW_SIO_RXCTL		0x00	/* control bulk rx channel transmissions, value=1/0 (on/off) */

Annotation

Implementation Notes