![Sebastian Andrzej Siewior](/assets/img/avatar_default.png)
The bcdDevice field is defined as |Device release number in binary-coded decimal in the USB 2.0 specification. We use this field to distinguish the UDCs from each other. In theory this could be used on the host side to apply certain quirks if the "special" UDC in combination with this gadget is used. This hasn't been done as far as I am aware. In practice it would be better to fix the UDC driver before shipping since a later release might not need this quirk anymore. There are some driver in tree (on the host side) which use the bcdDevice field to figure out special workarounds for a given firmware revision. This seems to make sense. Therefore this patch converts all gadgets (except a few) to use the kernel version instead a random 2 or 3 plus the UDC number. The few that don't report kernel's version are: - webcam This one reports always a version 0x10 so allow it to do so in future. - nokia This one reports always 0x211. The comment says that this gadget works only if the UDC supports altsettings so I added a check for this. - serial This one reports 0x2400 + UDC number. Since the gadget version is 2.4 this could make sense. Therefore bcdDevice is 0x2400 here. I also remove various gadget_is_<name> macros which are unused. The remaining few macros should be moved to feature / bug bitfield. Acked-by: Michal Nazarewicz <mina86@mina86.com> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Felipe Balbi <balbi@ti.com>
178 lines
4.8 KiB
C
178 lines
4.8 KiB
C
/*
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* gmidi.c -- USB MIDI Gadget Driver
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*
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* Copyright (C) 2006 Thumtronics Pty Ltd.
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* Developed for Thumtronics by Grey Innovation
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* Ben Williamson <ben.williamson@greyinnovation.com>
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*
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* This software is distributed under the terms of the GNU General Public
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* License ("GPL") version 2, as published by the Free Software Foundation.
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*
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* This code is based in part on:
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*
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* Gadget Zero driver, Copyright (C) 2003-2004 David Brownell.
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* USB Audio driver, Copyright (C) 2002 by Takashi Iwai.
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* USB MIDI driver, Copyright (C) 2002-2005 Clemens Ladisch.
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*
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* Refer to the USB Device Class Definition for MIDI Devices:
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* http://www.usb.org/developers/devclass_docs/midi10.pdf
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*/
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/* #define VERBOSE_DEBUG */
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <sound/core.h>
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#include <sound/initval.h>
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#include <sound/rawmidi.h>
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#include <linux/usb/ch9.h>
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#include <linux/usb/composite.h>
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#include <linux/usb/gadget.h>
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#include <linux/usb/audio.h>
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#include <linux/usb/midi.h>
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#include "gadget_chips.h"
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#include "f_midi.c"
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/*-------------------------------------------------------------------------*/
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MODULE_AUTHOR("Ben Williamson");
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MODULE_LICENSE("GPL v2");
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static const char shortname[] = "g_midi";
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static const char longname[] = "MIDI Gadget";
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USB_GADGET_COMPOSITE_OPTIONS();
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static int index = SNDRV_DEFAULT_IDX1;
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module_param(index, int, S_IRUGO);
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MODULE_PARM_DESC(index, "Index value for the USB MIDI Gadget adapter.");
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static char *id = SNDRV_DEFAULT_STR1;
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module_param(id, charp, S_IRUGO);
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MODULE_PARM_DESC(id, "ID string for the USB MIDI Gadget adapter.");
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static unsigned int buflen = 256;
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module_param(buflen, uint, S_IRUGO);
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MODULE_PARM_DESC(buflen, "MIDI buffer length");
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static unsigned int qlen = 32;
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module_param(qlen, uint, S_IRUGO);
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MODULE_PARM_DESC(qlen, "USB read request queue length");
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static unsigned int in_ports = 1;
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module_param(in_ports, uint, S_IRUGO);
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MODULE_PARM_DESC(in_ports, "Number of MIDI input ports");
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static unsigned int out_ports = 1;
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module_param(out_ports, uint, S_IRUGO);
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MODULE_PARM_DESC(out_ports, "Number of MIDI output ports");
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/* Thanks to Grey Innovation for donating this product ID.
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*
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* DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!!
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* Instead: allocate your own, using normal USB-IF procedures.
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*/
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#define DRIVER_VENDOR_NUM 0x17b3 /* Grey Innovation */
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#define DRIVER_PRODUCT_NUM 0x0004 /* Linux-USB "MIDI Gadget" */
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/* string IDs are assigned dynamically */
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#define STRING_DESCRIPTION_IDX USB_GADGET_FIRST_AVAIL_IDX
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static struct usb_device_descriptor device_desc = {
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.bLength = USB_DT_DEVICE_SIZE,
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.bDescriptorType = USB_DT_DEVICE,
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.bcdUSB = __constant_cpu_to_le16(0x0200),
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.bDeviceClass = USB_CLASS_PER_INTERFACE,
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.idVendor = __constant_cpu_to_le16(DRIVER_VENDOR_NUM),
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.idProduct = __constant_cpu_to_le16(DRIVER_PRODUCT_NUM),
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/* .iManufacturer = DYNAMIC */
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/* .iProduct = DYNAMIC */
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.bNumConfigurations = 1,
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};
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static struct usb_string strings_dev[] = {
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[USB_GADGET_MANUFACTURER_IDX].s = "Grey Innovation",
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[USB_GADGET_PRODUCT_IDX].s = "MIDI Gadget",
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[USB_GADGET_SERIAL_IDX].s = "",
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[STRING_DESCRIPTION_IDX].s = "MIDI",
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{ } /* end of list */
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};
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static struct usb_gadget_strings stringtab_dev = {
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.language = 0x0409, /* en-us */
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.strings = strings_dev,
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};
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static struct usb_gadget_strings *dev_strings[] = {
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&stringtab_dev,
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NULL,
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};
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static int __exit midi_unbind(struct usb_composite_dev *dev)
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{
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return 0;
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}
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static struct usb_configuration midi_config = {
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.label = "MIDI Gadget",
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.bConfigurationValue = 1,
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/* .iConfiguration = DYNAMIC */
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.bmAttributes = USB_CONFIG_ATT_ONE,
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.bMaxPower = CONFIG_USB_GADGET_VBUS_DRAW / 2,
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};
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static int __init midi_bind_config(struct usb_configuration *c)
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{
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return f_midi_bind_config(c, index, id,
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in_ports, out_ports,
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buflen, qlen);
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}
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static int __init midi_bind(struct usb_composite_dev *cdev)
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{
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int status;
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status = usb_string_ids_tab(cdev, strings_dev);
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if (status < 0)
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return status;
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device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id;
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device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id;
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midi_config.iConfiguration = strings_dev[STRING_DESCRIPTION_IDX].id;
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status = usb_add_config(cdev, &midi_config, midi_bind_config);
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if (status < 0)
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return status;
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usb_composite_overwrite_options(cdev, &coverwrite);
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pr_info("%s\n", longname);
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return 0;
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}
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static __refdata struct usb_composite_driver midi_driver = {
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.name = (char *) longname,
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.dev = &device_desc,
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.strings = dev_strings,
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.max_speed = USB_SPEED_HIGH,
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.bind = midi_bind,
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.unbind = __exit_p(midi_unbind),
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};
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static int __init midi_init(void)
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{
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return usb_composite_probe(&midi_driver);
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}
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module_init(midi_init);
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static void __exit midi_cleanup(void)
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{
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usb_composite_unregister(&midi_driver);
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}
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module_exit(midi_cleanup);
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