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USB fixes for 3.12-final
Here is a set of patches that revert all of the changes done to the pl2303 USB serial driver in the 3.12-rc timeframe, as it turns out they break some devices that work just fine on 3.11. As it's not a good idea to break working systems, drop them all and they will be reworked for future kernel versions such that there is no breakage. I've also included a MAINTAINERS update for the USB serial subsystem and a new device id for the ftdi_sio driver as well. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.19 (GNU/Linux) iEYEABECAAYFAlJz3VcACgkQMUfUDdst+ylxEQCgwiApcUC8e01hmRsuQxrbTC+v 2P8AnA6PIkyK5vO6+8BCy4YDx93dIwyQ =Tn7c -----END PGP SIGNATURE----- Merge tag 'usb-3.12-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb Pull USB fixes from Greg KH: "Here is a set of patches that revert all of the changes done to the pl2303 USB serial driver in the 3.12-rc timeframe, as it turns out they break some devices that work just fine on 3.11. As it's not a good idea to break working systems, drop them all and they will be reworked for future kernel versions such that there is no breakage. I've also included a MAINTAINERS update for the USB serial subsystem and a new device id for the ftdi_sio driver as well" * tag 'usb-3.12-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: USB: serial: ftdi_sio: add id for Z3X Box device USB: Maintainers change for usb serial drivers Revert "USB: pl2303: restrict the divisor based baud rate encoding method to the "HX" chip type" Revert "usb: pl2303: fix+improve the divsor based baud rate encoding method" Revert "usb: pl2303: do not round to the next nearest standard baud rate for the divisor based baud rate encoding method" Revert "usb: pl2303: remove 500000 baud from the list of standard baud rates" Revert "usb: pl2303: move the two baud rate encoding methods to separate functions" Revert "usb: pl2303: increase the allowed baud rate range for the divisor based encoding method" Revert "usb: pl2303: also use the divisor based baud rate encoding method for baud rates < 115200 with HX chips" Revert "usb: pl2303: add two comments concerning the supported baud rates with HX chips" Revert "pl2303: simplify the else-if contruct for type_1 chips in pl2303_startup()" Revert "pl2303: improve the chip type information output on startup" Revert "pl2303: improve the chip type detection/distinction" Revert "USB: pl2303: distinguish between original and cloned HX chips"
This commit is contained in:
Linus Torvalds
commit
9119e33e50
53
MAINTAINERS
53
MAINTAINERS
@ -8917,61 +8917,14 @@ W: http://pegasus2.sourceforge.net/
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S: Maintained
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F: drivers/net/usb/rtl8150.c
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USB SERIAL BELKIN F5U103 DRIVER
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M: William Greathouse <wgreathouse@smva.com>
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USB SERIAL SUBSYSTEM
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M: Johan Hovold <jhovold@gmail.com>
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L: linux-usb@vger.kernel.org
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S: Maintained
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F: drivers/usb/serial/belkin_sa.*
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USB SERIAL CYPRESS M8 DRIVER
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M: Lonnie Mendez <dignome@gmail.com>
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L: linux-usb@vger.kernel.org
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S: Maintained
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W: http://geocities.com/i0xox0i
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W: http://firstlight.net/cvs
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F: drivers/usb/serial/cypress_m8.*
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USB SERIAL CYBERJACK DRIVER
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M: Matthias Bruestle and Harald Welte <support@reiner-sct.com>
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W: http://www.reiner-sct.de/support/treiber_cyberjack.php
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S: Maintained
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F: drivers/usb/serial/cyberjack.c
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USB SERIAL DIGI ACCELEPORT DRIVER
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M: Peter Berger <pberger@brimson.com>
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M: Al Borchers <alborchers@steinerpoint.com>
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L: linux-usb@vger.kernel.org
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S: Maintained
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F: drivers/usb/serial/digi_acceleport.c
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USB SERIAL DRIVER
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M: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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L: linux-usb@vger.kernel.org
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S: Supported
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F: Documentation/usb/usb-serial.txt
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F: drivers/usb/serial/generic.c
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F: drivers/usb/serial/usb-serial.c
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F: drivers/usb/serial/
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F: include/linux/usb/serial.h
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USB SERIAL EMPEG EMPEG-CAR MARK I/II DRIVER
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M: Gary Brubaker <xavyer@ix.netcom.com>
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L: linux-usb@vger.kernel.org
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S: Maintained
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F: drivers/usb/serial/empeg.c
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USB SERIAL KEYSPAN DRIVER
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M: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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L: linux-usb@vger.kernel.org
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S: Maintained
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F: drivers/usb/serial/*keyspan*
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USB SERIAL WHITEHEAT DRIVER
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M: Support Department <support@connecttech.com>
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L: linux-usb@vger.kernel.org
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W: http://www.connecttech.com
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S: Supported
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F: drivers/usb/serial/whiteheat*
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USB SMSC75XX ETHERNET DRIVER
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M: Steve Glendinning <steve.glendinning@shawell.net>
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L: netdev@vger.kernel.org
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@ -904,6 +904,7 @@ static struct usb_device_id id_table_combined [] = {
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{ USB_DEVICE(FTDI_VID, FTDI_LUMEL_PD12_PID) },
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/* Crucible Devices */
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{ USB_DEVICE(FTDI_VID, FTDI_CT_COMET_PID) },
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{ USB_DEVICE(FTDI_VID, FTDI_Z3X_PID) },
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{ } /* Terminating entry */
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};
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@ -1307,3 +1307,9 @@
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* Manufacturer: Crucible Technologies
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*/
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#define FTDI_CT_COMET_PID 0x8e08
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/*
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* Product: Z3X Box
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* Manufacturer: Smart GSM Team
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*/
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#define FTDI_Z3X_PID 0x0011
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@ -4,11 +4,6 @@
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* Copyright (C) 2001-2007 Greg Kroah-Hartman (greg@kroah.com)
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* Copyright (C) 2003 IBM Corp.
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*
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* Copyright (C) 2009, 2013 Frank Schäfer <fschaefer.oss@googlemail.com>
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* - fixes, improvements and documentation for the baud rate encoding methods
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* Copyright (C) 2013 Reinhard Max <max@suse.de>
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* - fixes and improvements for the divisor based baud rate encoding method
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*
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* Original driver for 2.2.x by anonymous
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*
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* This program is free software; you can redistribute it and/or
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@ -134,18 +129,10 @@ MODULE_DEVICE_TABLE(usb, id_table);
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enum pl2303_type {
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type_0, /* H version ? */
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type_1, /* H version ? */
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HX_TA, /* HX(A) / X(A) / TA version */ /* TODO: improve */
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HXD_EA_RA_SA, /* HXD / EA / RA / SA version */ /* TODO: improve */
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TB, /* TB version */
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HX_CLONE, /* Cheap and less functional clone of the HX chip */
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type_0, /* don't know the difference between type 0 and */
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type_1, /* type 1, until someone from prolific tells us... */
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HX, /* HX version of the pl2303 chip */
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};
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/*
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* NOTE: don't know the difference between type 0 and type 1,
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* until someone from Prolific tells us...
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* TODO: distinguish between X/HX, TA and HXD, EA, RA, SA variants
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*/
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struct pl2303_serial_private {
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enum pl2303_type type;
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@ -185,7 +172,6 @@ static int pl2303_startup(struct usb_serial *serial)
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{
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struct pl2303_serial_private *spriv;
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enum pl2303_type type = type_0;
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char *type_str = "unknown (treating as type_0)";
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unsigned char *buf;
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spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
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@ -198,53 +184,15 @@ static int pl2303_startup(struct usb_serial *serial)
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return -ENOMEM;
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}
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if (serial->dev->descriptor.bDeviceClass == 0x02) {
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if (serial->dev->descriptor.bDeviceClass == 0x02)
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type = type_0;
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type_str = "type_0";
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} else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40) {
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/*
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* NOTE: The bcdDevice version is the only difference between
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* the device descriptors of the X/HX, HXD, EA, RA, SA, TA, TB
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*/
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if (le16_to_cpu(serial->dev->descriptor.bcdDevice) == 0x300) {
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/* Check if the device is a clone */
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pl2303_vendor_read(0x9494, 0, serial, buf);
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/*
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* NOTE: Not sure if this read is really needed.
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* The HX returns 0x00, the clone 0x02, but the Windows
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* driver seems to ignore the value and continues.
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*/
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pl2303_vendor_write(0x0606, 0xaa, serial);
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pl2303_vendor_read(0x8686, 0, serial, buf);
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if (buf[0] != 0xaa) {
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type = HX_CLONE;
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type_str = "X/HX clone (limited functionality)";
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} else {
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type = HX_TA;
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type_str = "X/HX/TA";
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}
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pl2303_vendor_write(0x0606, 0x00, serial);
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} else if (le16_to_cpu(serial->dev->descriptor.bcdDevice)
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== 0x400) {
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type = HXD_EA_RA_SA;
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type_str = "HXD/EA/RA/SA";
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} else if (le16_to_cpu(serial->dev->descriptor.bcdDevice)
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== 0x500) {
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type = TB;
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type_str = "TB";
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} else {
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dev_info(&serial->interface->dev,
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"unknown/unsupported device type\n");
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kfree(spriv);
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kfree(buf);
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return -ENODEV;
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}
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} else if (serial->dev->descriptor.bDeviceClass == 0x00
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|| serial->dev->descriptor.bDeviceClass == 0xFF) {
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else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40)
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type = HX;
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else if (serial->dev->descriptor.bDeviceClass == 0x00)
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type = type_1;
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type_str = "type_1";
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}
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dev_dbg(&serial->interface->dev, "device type: %s\n", type_str);
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else if (serial->dev->descriptor.bDeviceClass == 0xFF)
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type = type_1;
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dev_dbg(&serial->interface->dev, "device type: %d\n", type);
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spriv->type = type;
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usb_set_serial_data(serial, spriv);
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@ -259,10 +207,10 @@ static int pl2303_startup(struct usb_serial *serial)
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pl2303_vendor_read(0x8383, 0, serial, buf);
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pl2303_vendor_write(0, 1, serial);
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pl2303_vendor_write(1, 0, serial);
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if (type == type_0 || type == type_1)
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pl2303_vendor_write(2, 0x24, serial);
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else
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if (type == HX)
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pl2303_vendor_write(2, 0x44, serial);
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else
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pl2303_vendor_write(2, 0x24, serial);
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kfree(buf);
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return 0;
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@ -316,174 +264,65 @@ static int pl2303_set_control_lines(struct usb_serial_port *port, u8 value)
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return retval;
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}
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static int pl2303_baudrate_encode_direct(int baud, enum pl2303_type type,
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u8 buf[4])
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static void pl2303_encode_baudrate(struct tty_struct *tty,
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struct usb_serial_port *port,
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u8 buf[4])
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{
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/*
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* NOTE: Only the values defined in baud_sup are supported !
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* => if unsupported values are set, the PL2303 uses 9600 baud instead
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* => HX clones just don't work at unsupported baud rates < 115200 baud,
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* for baud rates > 115200 they run at 115200 baud
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*/
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const int baud_sup[] = { 75, 150, 300, 600, 1200, 1800, 2400, 3600,
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4800, 7200, 9600, 14400, 19200, 28800, 38400,
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57600, 115200, 230400, 460800, 614400, 921600,
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1228800, 2457600, 3000000, 6000000, 12000000 };
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/*
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* NOTE: With the exception of type_0/1 devices, the following
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* additional baud rates are supported (tested with HX rev. 3A only):
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* 110*, 56000*, 128000, 134400, 161280, 201600, 256000*, 268800,
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* 403200, 806400. (*: not HX and HX clones)
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*
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* Maximum values: HXD, TB: 12000000; HX, TA: 6000000;
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* type_0+1: 1228800; RA: 921600; HX clones, SA: 115200
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*
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* As long as we are not using this encoding method for anything else
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* than the type_0+1, HX and HX clone chips, there is no point in
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* complicating the code to support them.
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*/
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4800, 7200, 9600, 14400, 19200, 28800, 38400,
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57600, 115200, 230400, 460800, 500000, 614400,
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921600, 1228800, 2457600, 3000000, 6000000 };
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struct usb_serial *serial = port->serial;
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struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
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int baud;
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int i;
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/*
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* NOTE: Only the values defined in baud_sup are supported!
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* => if unsupported values are set, the PL2303 seems to use
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* 9600 baud (at least my PL2303X always does)
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*/
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baud = tty_get_baud_rate(tty);
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dev_dbg(&port->dev, "baud requested = %d\n", baud);
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if (!baud)
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return;
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/* Set baudrate to nearest supported value */
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for (i = 0; i < ARRAY_SIZE(baud_sup); ++i) {
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if (baud_sup[i] > baud)
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break;
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}
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if (i == ARRAY_SIZE(baud_sup))
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baud = baud_sup[i - 1];
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else if (i > 0 && (baud_sup[i] - baud) > (baud - baud_sup[i - 1]))
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baud = baud_sup[i - 1];
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else
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baud = baud_sup[i];
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/* Respect the chip type specific baud rate limits */
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/*
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* FIXME: as long as we don't know how to distinguish between the
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* HXD, EA, RA, and SA chip variants, allow the max. value of 12M.
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*/
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if (type == HX_TA)
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baud = min_t(int, baud, 6000000);
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else if (type == type_0 || type == type_1)
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/* type_0, type_1 only support up to 1228800 baud */
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if (spriv->type != HX)
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baud = min_t(int, baud, 1228800);
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else if (type == HX_CLONE)
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baud = min_t(int, baud, 115200);
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/* Direct (standard) baud rate encoding method */
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put_unaligned_le32(baud, buf);
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return baud;
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}
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static int pl2303_baudrate_encode_divisor(int baud, enum pl2303_type type,
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u8 buf[4])
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{
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/*
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* Divisor based baud rate encoding method
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*
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* NOTE: HX clones do NOT support this method.
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* It's not clear if the type_0/1 chips support it.
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*
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* divisor = 12MHz * 32 / baudrate = 2^A * B
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*
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* with
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*
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* A = buf[1] & 0x0e
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* B = buf[0] + (buf[1] & 0x01) << 8
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*
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* Special cases:
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* => 8 < B < 16: device seems to work not properly
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* => B <= 8: device uses the max. value B = 512 instead
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*/
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unsigned int A, B;
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/*
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* NOTE: The Windows driver allows maximum baud rates of 110% of the
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* specified maximium value.
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* Quick tests with early (2004) HX (rev. A) chips suggest, that even
|
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* higher baud rates (up to the maximum of 24M baud !) are working fine,
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* but that should really be tested carefully in "real life" scenarios
|
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* before removing the upper limit completely.
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* Baud rates smaller than the specified 75 baud are definitely working
|
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* fine.
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*/
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if (type == type_0 || type == type_1)
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baud = min_t(int, baud, 1228800 * 1.1);
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else if (type == HX_TA)
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baud = min_t(int, baud, 6000000 * 1.1);
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else if (type == HXD_EA_RA_SA)
|
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/* HXD, EA: 12Mbps; RA: 1Mbps; SA: 115200 bps */
|
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/*
|
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* FIXME: as long as we don't know how to distinguish between
|
||||
* these chip variants, allow the max. of these values
|
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*/
|
||||
baud = min_t(int, baud, 12000000 * 1.1);
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else if (type == TB)
|
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baud = min_t(int, baud, 12000000 * 1.1);
|
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/* Determine factors A and B */
|
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A = 0;
|
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B = 12000000 * 32 / baud; /* 12MHz */
|
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B <<= 1; /* Add one bit for rounding */
|
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while (B > (512 << 1) && A <= 14) {
|
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A += 2;
|
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B >>= 2;
|
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}
|
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if (A > 14) { /* max. divisor = min. baudrate reached */
|
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A = 14;
|
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B = 512;
|
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/* => ~45.78 baud */
|
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if (baud <= 115200) {
|
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put_unaligned_le32(baud, buf);
|
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} else {
|
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B = (B + 1) >> 1; /* Round the last bit */
|
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}
|
||||
/* Handle special cases */
|
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if (B == 512)
|
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B = 0; /* also: 1 to 8 */
|
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else if (B < 16)
|
||||
/*
|
||||
* NOTE: With the current algorithm this happens
|
||||
* only for A=0 and means that the min. divisor
|
||||
* (respectively: the max. baudrate) is reached.
|
||||
* Apparently the formula for higher speeds is:
|
||||
* baudrate = 12M * 32 / (2^buf[1]) / buf[0]
|
||||
*/
|
||||
B = 16; /* => 24 MBaud */
|
||||
/* Encode the baud rate */
|
||||
buf[3] = 0x80; /* Select divisor encoding method */
|
||||
buf[2] = 0;
|
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buf[1] = (A & 0x0e); /* A */
|
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buf[1] |= ((B & 0x100) >> 8); /* MSB of B */
|
||||
buf[0] = B & 0xff; /* 8 LSBs of B */
|
||||
/* Calculate the actual/resulting baud rate */
|
||||
if (B <= 8)
|
||||
B = 512;
|
||||
baud = 12000000 * 32 / ((1 << A) * B);
|
||||
unsigned tmp = 12000000 * 32 / baud;
|
||||
buf[3] = 0x80;
|
||||
buf[2] = 0;
|
||||
buf[1] = (tmp >= 256);
|
||||
while (tmp >= 256) {
|
||||
tmp >>= 2;
|
||||
buf[1] <<= 1;
|
||||
}
|
||||
buf[0] = tmp;
|
||||
}
|
||||
|
||||
return baud;
|
||||
}
|
||||
|
||||
static void pl2303_encode_baudrate(struct tty_struct *tty,
|
||||
struct usb_serial_port *port,
|
||||
enum pl2303_type type,
|
||||
u8 buf[4])
|
||||
{
|
||||
int baud;
|
||||
|
||||
baud = tty_get_baud_rate(tty);
|
||||
dev_dbg(&port->dev, "baud requested = %d\n", baud);
|
||||
if (!baud)
|
||||
return;
|
||||
/*
|
||||
* There are two methods for setting/encoding the baud rate
|
||||
* 1) Direct method: encodes the baud rate value directly
|
||||
* => supported by all chip types
|
||||
* 2) Divisor based method: encodes a divisor to a base value (12MHz*32)
|
||||
* => not supported by HX clones (and likely type_0/1 chips)
|
||||
*
|
||||
* NOTE: Although the divisor based baud rate encoding method is much
|
||||
* more flexible, some of the standard baud rate values can not be
|
||||
* realized exactly. But the difference is very small (max. 0.2%) and
|
||||
* the device likely uses the same baud rate generator for both methods
|
||||
* so that there is likley no difference.
|
||||
*/
|
||||
if (type == type_0 || type == type_1 || type == HX_CLONE)
|
||||
baud = pl2303_baudrate_encode_direct(baud, type, buf);
|
||||
else
|
||||
baud = pl2303_baudrate_encode_divisor(baud, type, buf);
|
||||
/* Save resulting baud rate */
|
||||
tty_encode_baud_rate(tty, baud, baud);
|
||||
dev_dbg(&port->dev, "baud set = %d\n", baud);
|
||||
@ -540,8 +379,8 @@ static void pl2303_set_termios(struct tty_struct *tty,
|
||||
dev_dbg(&port->dev, "data bits = %d\n", buf[6]);
|
||||
}
|
||||
|
||||
/* For reference: buf[0]:buf[3] baud rate value */
|
||||
pl2303_encode_baudrate(tty, port, spriv->type, buf);
|
||||
/* For reference buf[0]:buf[3] baud rate value */
|
||||
pl2303_encode_baudrate(tty, port, &buf[0]);
|
||||
|
||||
/* For reference buf[4]=0 is 1 stop bits */
|
||||
/* For reference buf[4]=1 is 1.5 stop bits */
|
||||
@ -618,10 +457,10 @@ static void pl2303_set_termios(struct tty_struct *tty,
|
||||
dev_dbg(&port->dev, "0xa1:0x21:0:0 %d - %7ph\n", i, buf);
|
||||
|
||||
if (C_CRTSCTS(tty)) {
|
||||
if (spriv->type == type_0 || spriv->type == type_1)
|
||||
pl2303_vendor_write(0x0, 0x41, serial);
|
||||
else
|
||||
if (spriv->type == HX)
|
||||
pl2303_vendor_write(0x0, 0x61, serial);
|
||||
else
|
||||
pl2303_vendor_write(0x0, 0x41, serial);
|
||||
} else {
|
||||
pl2303_vendor_write(0x0, 0x0, serial);
|
||||
}
|
||||
@ -658,7 +497,7 @@ static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port)
|
||||
struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
|
||||
int result;
|
||||
|
||||
if (spriv->type == type_0 || spriv->type == type_1) {
|
||||
if (spriv->type != HX) {
|
||||
usb_clear_halt(serial->dev, port->write_urb->pipe);
|
||||
usb_clear_halt(serial->dev, port->read_urb->pipe);
|
||||
} else {
|
||||
@ -833,7 +672,6 @@ static void pl2303_break_ctl(struct tty_struct *tty, int break_state)
|
||||
result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
|
||||
BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
|
||||
0, NULL, 0, 100);
|
||||
/* NOTE: HX clones don't support sending breaks, -EPIPE is returned */
|
||||
if (result)
|
||||
dev_err(&port->dev, "error sending break = %d\n", result);
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user