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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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7ea9fde760
512 is the value used by wMaxPacketSize, as specified by the USB Spec. This makes sure this driver uses, by default, the most optimal value for IN and OUT endpoint requests. Signed-off-by: Felipe F. Tonello <eu@felipetonello.com> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
188 lines
5.0 KiB
C
188 lines
5.0 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/module.h>
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#include <sound/initval.h>
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#include <linux/usb/composite.h>
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#include <linux/usb/gadget.h>
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#include "u_midi.h"
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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 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 = 512;
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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 and write 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 = DYNAMIC */
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.bDeviceClass = USB_CLASS_PER_INTERFACE,
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.idVendor = cpu_to_le16(DRIVER_VENDOR_NUM),
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.idProduct = 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 struct usb_function_instance *fi_midi;
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static struct usb_function *f_midi;
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static int midi_unbind(struct usb_composite_dev *dev)
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{
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usb_put_function(f_midi);
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usb_put_function_instance(fi_midi);
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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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.MaxPower = CONFIG_USB_GADGET_VBUS_DRAW,
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};
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static int midi_bind_config(struct usb_configuration *c)
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{
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int status;
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f_midi = usb_get_function(fi_midi);
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if (IS_ERR(f_midi))
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return PTR_ERR(f_midi);
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status = usb_add_function(c, f_midi);
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if (status < 0) {
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usb_put_function(f_midi);
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return status;
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}
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return 0;
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}
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static int midi_bind(struct usb_composite_dev *cdev)
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{
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struct f_midi_opts *midi_opts;
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int status;
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fi_midi = usb_get_function_instance("midi");
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if (IS_ERR(fi_midi))
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return PTR_ERR(fi_midi);
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midi_opts = container_of(fi_midi, struct f_midi_opts, func_inst);
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midi_opts->index = index;
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midi_opts->id = id;
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midi_opts->in_ports = in_ports;
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midi_opts->out_ports = out_ports;
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midi_opts->buflen = buflen;
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midi_opts->qlen = qlen;
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status = usb_string_ids_tab(cdev, strings_dev);
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if (status < 0)
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goto put;
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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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goto put;
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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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put:
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usb_put_function_instance(fi_midi);
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return status;
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}
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static 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 = midi_unbind,
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};
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module_usb_composite_driver(midi_driver);
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