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185 lines
4.8 KiB
185 lines
4.8 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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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 <[email protected]> |
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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 = 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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