linux/drivers/usb/serial/safe_serial.c
Greg Kroah-Hartman 6ca98bc284 USB: serial: Remove redundant license text
Now that the SPDX tag is in all USB files, that identifies the license
in a specific and legally-defined manner.  So the extra GPL text wording
can be removed as it is no longer needed at all.

This is done on a quest to remove the 700+ different ways that files in
the kernel describe the GPL license text.  And there's unneeded stuff
like the address (sometimes incorrect) for the FSF which is never
needed.

No copyright headers or other non-license-description text was removed.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-04 11:55:38 +01:00

302 lines
9.7 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Safe Encapsulated USB Serial Driver
*
* Copyright (C) 2010 Johan Hovold <jhovold@gmail.com>
* Copyright (C) 2001 Lineo
* Copyright (C) 2001 Hewlett-Packard
*
* By:
* Stuart Lynne <sl@lineo.com>, Tom Rushworth <tbr@lineo.com>
*/
/*
* The encapsultaion is designed to overcome difficulties with some USB
* hardware.
*
* While the USB protocol has a CRC over the data while in transit, i.e. while
* being carried over the bus, there is no end to end protection. If the
* hardware has any problems getting the data into or out of the USB transmit
* and receive FIFO's then data can be lost.
*
* This protocol adds a two byte trailer to each USB packet to specify the
* number of bytes of valid data and a 10 bit CRC that will allow the receiver
* to verify that the entire USB packet was received without error.
*
* Because in this case the sender and receiver are the class and function
* drivers there is now end to end protection.
*
* There is an additional option that can be used to force all transmitted
* packets to be padded to the maximum packet size. This provides a work
* around for some devices which have problems with small USB packets.
*
* Assuming a packetsize of N:
*
* 0..N-2 data and optional padding
*
* N-2 bits 7-2 - number of bytes of valid data
* bits 1-0 top two bits of 10 bit CRC
* N-1 bottom 8 bits of 10 bit CRC
*
*
* | Data Length | 10 bit CRC |
* + 7 . 6 . 5 . 4 . 3 . 2 . 1 . 0 | 7 . 6 . 5 . 4 . 3 . 2 . 1 . 0 +
*
* The 10 bit CRC is computed across the sent data, followed by the trailer
* with the length set and the CRC set to zero. The CRC is then OR'd into
* the trailer.
*
* When received a 10 bit CRC is computed over the entire frame including
* the trailer and should be equal to zero.
*
* Two module parameters are used to control the encapsulation, if both are
* turned of the module works as a simple serial device with NO
* encapsulation.
*
* See linux/drivers/usbd/serial_fd for a device function driver
* implementation of this.
*
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/gfp.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/uaccess.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
static bool safe = true;
static bool padded = IS_ENABLED(CONFIG_USB_SERIAL_SAFE_PADDED);
#define DRIVER_AUTHOR "sl@lineo.com, tbr@lineo.com, Johan Hovold <jhovold@gmail.com>"
#define DRIVER_DESC "USB Safe Encapsulated Serial"
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
module_param(safe, bool, 0);
MODULE_PARM_DESC(safe, "Turn Safe Encapsulation On/Off");
module_param(padded, bool, 0);
MODULE_PARM_DESC(padded, "Pad to full wMaxPacketSize On/Off");
#define CDC_DEVICE_CLASS 0x02
#define CDC_INTERFACE_CLASS 0x02
#define CDC_INTERFACE_SUBCLASS 0x06
#define LINEO_INTERFACE_CLASS 0xff
#define LINEO_INTERFACE_SUBCLASS_SAFENET 0x01
#define LINEO_SAFENET_CRC 0x01
#define LINEO_SAFENET_CRC_PADDED 0x02
#define LINEO_INTERFACE_SUBCLASS_SAFESERIAL 0x02
#define LINEO_SAFESERIAL_CRC 0x01
#define LINEO_SAFESERIAL_CRC_PADDED 0x02
#define MY_USB_DEVICE(vend, prod, dc, ic, isc) \
.match_flags = USB_DEVICE_ID_MATCH_DEVICE | \
USB_DEVICE_ID_MATCH_DEV_CLASS | \
USB_DEVICE_ID_MATCH_INT_CLASS | \
USB_DEVICE_ID_MATCH_INT_SUBCLASS, \
.idVendor = (vend), \
.idProduct = (prod),\
.bDeviceClass = (dc),\
.bInterfaceClass = (ic), \
.bInterfaceSubClass = (isc),
static const struct usb_device_id id_table[] = {
{MY_USB_DEVICE(0x49f, 0xffff, CDC_DEVICE_CLASS, LINEO_INTERFACE_CLASS, LINEO_INTERFACE_SUBCLASS_SAFESERIAL)}, /* Itsy */
{MY_USB_DEVICE(0x3f0, 0x2101, CDC_DEVICE_CLASS, LINEO_INTERFACE_CLASS, LINEO_INTERFACE_SUBCLASS_SAFESERIAL)}, /* Calypso */
{MY_USB_DEVICE(0x4dd, 0x8001, CDC_DEVICE_CLASS, LINEO_INTERFACE_CLASS, LINEO_INTERFACE_SUBCLASS_SAFESERIAL)}, /* Iris */
{MY_USB_DEVICE(0x4dd, 0x8002, CDC_DEVICE_CLASS, LINEO_INTERFACE_CLASS, LINEO_INTERFACE_SUBCLASS_SAFESERIAL)}, /* Collie */
{MY_USB_DEVICE(0x4dd, 0x8003, CDC_DEVICE_CLASS, LINEO_INTERFACE_CLASS, LINEO_INTERFACE_SUBCLASS_SAFESERIAL)}, /* Collie */
{MY_USB_DEVICE(0x4dd, 0x8004, CDC_DEVICE_CLASS, LINEO_INTERFACE_CLASS, LINEO_INTERFACE_SUBCLASS_SAFESERIAL)}, /* Collie */
{MY_USB_DEVICE(0x5f9, 0xffff, CDC_DEVICE_CLASS, LINEO_INTERFACE_CLASS, LINEO_INTERFACE_SUBCLASS_SAFESERIAL)}, /* Sharp tmp */
{} /* terminating entry */
};
MODULE_DEVICE_TABLE(usb, id_table);
static const __u16 crc10_table[256] = {
0x000, 0x233, 0x255, 0x066, 0x299, 0x0aa, 0x0cc, 0x2ff,
0x301, 0x132, 0x154, 0x367, 0x198, 0x3ab, 0x3cd, 0x1fe,
0x031, 0x202, 0x264, 0x057, 0x2a8, 0x09b, 0x0fd, 0x2ce,
0x330, 0x103, 0x165, 0x356, 0x1a9, 0x39a, 0x3fc, 0x1cf,
0x062, 0x251, 0x237, 0x004, 0x2fb, 0x0c8, 0x0ae, 0x29d,
0x363, 0x150, 0x136, 0x305, 0x1fa, 0x3c9, 0x3af, 0x19c,
0x053, 0x260, 0x206, 0x035, 0x2ca, 0x0f9, 0x09f, 0x2ac,
0x352, 0x161, 0x107, 0x334, 0x1cb, 0x3f8, 0x39e, 0x1ad,
0x0c4, 0x2f7, 0x291, 0x0a2, 0x25d, 0x06e, 0x008, 0x23b,
0x3c5, 0x1f6, 0x190, 0x3a3, 0x15c, 0x36f, 0x309, 0x13a,
0x0f5, 0x2c6, 0x2a0, 0x093, 0x26c, 0x05f, 0x039, 0x20a,
0x3f4, 0x1c7, 0x1a1, 0x392, 0x16d, 0x35e, 0x338, 0x10b,
0x0a6, 0x295, 0x2f3, 0x0c0, 0x23f, 0x00c, 0x06a, 0x259,
0x3a7, 0x194, 0x1f2, 0x3c1, 0x13e, 0x30d, 0x36b, 0x158,
0x097, 0x2a4, 0x2c2, 0x0f1, 0x20e, 0x03d, 0x05b, 0x268,
0x396, 0x1a5, 0x1c3, 0x3f0, 0x10f, 0x33c, 0x35a, 0x169,
0x188, 0x3bb, 0x3dd, 0x1ee, 0x311, 0x122, 0x144, 0x377,
0x289, 0x0ba, 0x0dc, 0x2ef, 0x010, 0x223, 0x245, 0x076,
0x1b9, 0x38a, 0x3ec, 0x1df, 0x320, 0x113, 0x175, 0x346,
0x2b8, 0x08b, 0x0ed, 0x2de, 0x021, 0x212, 0x274, 0x047,
0x1ea, 0x3d9, 0x3bf, 0x18c, 0x373, 0x140, 0x126, 0x315,
0x2eb, 0x0d8, 0x0be, 0x28d, 0x072, 0x241, 0x227, 0x014,
0x1db, 0x3e8, 0x38e, 0x1bd, 0x342, 0x171, 0x117, 0x324,
0x2da, 0x0e9, 0x08f, 0x2bc, 0x043, 0x270, 0x216, 0x025,
0x14c, 0x37f, 0x319, 0x12a, 0x3d5, 0x1e6, 0x180, 0x3b3,
0x24d, 0x07e, 0x018, 0x22b, 0x0d4, 0x2e7, 0x281, 0x0b2,
0x17d, 0x34e, 0x328, 0x11b, 0x3e4, 0x1d7, 0x1b1, 0x382,
0x27c, 0x04f, 0x029, 0x21a, 0x0e5, 0x2d6, 0x2b0, 0x083,
0x12e, 0x31d, 0x37b, 0x148, 0x3b7, 0x184, 0x1e2, 0x3d1,
0x22f, 0x01c, 0x07a, 0x249, 0x0b6, 0x285, 0x2e3, 0x0d0,
0x11f, 0x32c, 0x34a, 0x179, 0x386, 0x1b5, 0x1d3, 0x3e0,
0x21e, 0x02d, 0x04b, 0x278, 0x087, 0x2b4, 0x2d2, 0x0e1,
};
#define CRC10_INITFCS 0x000 /* Initial FCS value */
#define CRC10_GOODFCS 0x000 /* Good final FCS value */
#define CRC10_FCS(fcs, c) ((((fcs) << 8) & 0x3ff) ^ crc10_table[((fcs) >> 2) & 0xff] ^ (c))
/**
* fcs_compute10 - memcpy and calculate 10 bit CRC across buffer
* @sp: pointer to buffer
* @len: number of bytes
* @fcs: starting FCS
*
* Perform a memcpy and calculate fcs using ppp 10bit CRC algorithm. Return
* new 10 bit FCS.
*/
static inline __u16 fcs_compute10(unsigned char *sp, int len, __u16 fcs)
{
for (; len-- > 0; fcs = CRC10_FCS(fcs, *sp++));
return fcs;
}
static void safe_process_read_urb(struct urb *urb)
{
struct usb_serial_port *port = urb->context;
unsigned char *data = urb->transfer_buffer;
unsigned char length = urb->actual_length;
int actual_length;
__u16 fcs;
if (!length)
return;
if (!safe)
goto out;
if (length < 2) {
dev_err(&port->dev, "malformed packet\n");
return;
}
fcs = fcs_compute10(data, length, CRC10_INITFCS);
if (fcs) {
dev_err(&port->dev, "%s - bad CRC %x\n", __func__, fcs);
return;
}
actual_length = data[length - 2] >> 2;
if (actual_length > (length - 2)) {
dev_err(&port->dev, "%s - inconsistent lengths %d:%d\n",
__func__, actual_length, length);
return;
}
dev_info(&urb->dev->dev, "%s - actual: %d\n", __func__, actual_length);
length = actual_length;
out:
tty_insert_flip_string(&port->port, data, length);
tty_flip_buffer_push(&port->port);
}
static int safe_prepare_write_buffer(struct usb_serial_port *port,
void *dest, size_t size)
{
unsigned char *buf = dest;
int count;
int trailer_len;
int pkt_len;
__u16 fcs;
trailer_len = safe ? 2 : 0;
count = kfifo_out_locked(&port->write_fifo, buf, size - trailer_len,
&port->lock);
if (!safe)
return count;
/* pad if necessary */
if (padded) {
pkt_len = size;
memset(buf + count, '0', pkt_len - count - trailer_len);
} else {
pkt_len = count + trailer_len;
}
/* set count */
buf[pkt_len - 2] = count << 2;
buf[pkt_len - 1] = 0;
/* compute fcs and insert into trailer */
fcs = fcs_compute10(buf, pkt_len, CRC10_INITFCS);
buf[pkt_len - 2] |= fcs >> 8;
buf[pkt_len - 1] |= fcs & 0xff;
return pkt_len;
}
static int safe_startup(struct usb_serial *serial)
{
struct usb_interface_descriptor *desc;
if (serial->dev->descriptor.bDeviceClass != CDC_DEVICE_CLASS)
return -ENODEV;
desc = &serial->interface->cur_altsetting->desc;
if (desc->bInterfaceClass != LINEO_INTERFACE_CLASS)
return -ENODEV;
if (desc->bInterfaceSubClass != LINEO_INTERFACE_SUBCLASS_SAFESERIAL)
return -ENODEV;
switch (desc->bInterfaceProtocol) {
case LINEO_SAFESERIAL_CRC:
break;
case LINEO_SAFESERIAL_CRC_PADDED:
padded = true;
break;
default:
return -EINVAL;
}
return 0;
}
static struct usb_serial_driver safe_device = {
.driver = {
.owner = THIS_MODULE,
.name = "safe_serial",
},
.id_table = id_table,
.num_ports = 1,
.process_read_urb = safe_process_read_urb,
.prepare_write_buffer = safe_prepare_write_buffer,
.attach = safe_startup,
};
static struct usb_serial_driver * const serial_drivers[] = {
&safe_device, NULL
};
module_usb_serial_driver(serial_drivers, id_table);