diff options
Diffstat (limited to 'drivers/usb/gadget/legacy/gmidi.c')
| -rw-r--r-- | drivers/usb/gadget/legacy/gmidi.c | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/drivers/usb/gadget/legacy/gmidi.c b/drivers/usb/gadget/legacy/gmidi.c new file mode 100644 index 000000000..9eea2d18f --- /dev/null +++ b/drivers/usb/gadget/legacy/gmidi.c @@ -0,0 +1,185 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * gmidi.c -- USB MIDI Gadget Driver + * + * Copyright (C) 2006 Thumtronics Pty Ltd. + * Developed for Thumtronics by Grey Innovation + * Ben Williamson <ben.williamson@greyinnovation.com> + * + * This code is based in part on: + * + * Gadget Zero driver, Copyright (C) 2003-2004 David Brownell. + * USB Audio driver, Copyright (C) 2002 by Takashi Iwai. + * USB MIDI driver, Copyright (C) 2002-2005 Clemens Ladisch. + * + * Refer to the USB Device Class Definition for MIDI Devices: + * http://www.usb.org/developers/devclass_docs/midi10.pdf + */ + +/* #define VERBOSE_DEBUG */ + +#include <linux/kernel.h> +#include <linux/module.h> + +#include <sound/initval.h> + +#include <linux/usb/composite.h> +#include <linux/usb/gadget.h> + +#include "u_midi.h" + +/*-------------------------------------------------------------------------*/ + +MODULE_AUTHOR("Ben Williamson"); +MODULE_LICENSE("GPL v2"); + +static const char longname[] = "MIDI Gadget"; + +USB_GADGET_COMPOSITE_OPTIONS(); + +static int index = SNDRV_DEFAULT_IDX1; +module_param(index, int, S_IRUGO); +MODULE_PARM_DESC(index, "Index value for the USB MIDI Gadget adapter."); + +static char *id = SNDRV_DEFAULT_STR1; +module_param(id, charp, S_IRUGO); +MODULE_PARM_DESC(id, "ID string for the USB MIDI Gadget adapter."); + +static unsigned int buflen = 512; +module_param(buflen, uint, S_IRUGO); +MODULE_PARM_DESC(buflen, "MIDI buffer length"); + +static unsigned int qlen = 32; +module_param(qlen, uint, S_IRUGO); +MODULE_PARM_DESC(qlen, "USB read and write request queue length"); + +static unsigned int in_ports = 1; +module_param(in_ports, uint, S_IRUGO); +MODULE_PARM_DESC(in_ports, "Number of MIDI input ports"); + +static unsigned int out_ports = 1; +module_param(out_ports, uint, S_IRUGO); +MODULE_PARM_DESC(out_ports, "Number of MIDI output ports"); + +/* Thanks to Grey Innovation for donating this product ID. + * + * DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!! + * Instead: allocate your own, using normal USB-IF procedures. + */ +#define DRIVER_VENDOR_NUM 0x17b3 /* Grey Innovation */ +#define DRIVER_PRODUCT_NUM 0x0004 /* Linux-USB "MIDI Gadget" */ + +/* string IDs are assigned dynamically */ + +#define STRING_DESCRIPTION_IDX USB_GADGET_FIRST_AVAIL_IDX + +static struct usb_device_descriptor device_desc = { + .bLength = USB_DT_DEVICE_SIZE, + .bDescriptorType = USB_DT_DEVICE, + /* .bcdUSB = DYNAMIC */ + .bDeviceClass = USB_CLASS_PER_INTERFACE, + .idVendor = cpu_to_le16(DRIVER_VENDOR_NUM), + .idProduct = cpu_to_le16(DRIVER_PRODUCT_NUM), + /* .iManufacturer = DYNAMIC */ + /* .iProduct = DYNAMIC */ + .bNumConfigurations = 1, +}; + +static struct usb_string strings_dev[] = { + [USB_GADGET_MANUFACTURER_IDX].s = "Grey Innovation", + [USB_GADGET_PRODUCT_IDX].s = "MIDI Gadget", + [USB_GADGET_SERIAL_IDX].s = "", + [STRING_DESCRIPTION_IDX].s = "MIDI", + { } /* end of list */ +}; + +static struct usb_gadget_strings stringtab_dev = { + .language = 0x0409, /* en-us */ + .strings = strings_dev, +}; + +static struct usb_gadget_strings *dev_strings[] = { + &stringtab_dev, + NULL, +}; + +static struct usb_function_instance *fi_midi; +static struct usb_function *f_midi; + +static int midi_unbind(struct usb_composite_dev *dev) +{ + usb_put_function(f_midi); + usb_put_function_instance(fi_midi); + return 0; +} + +static struct usb_configuration midi_config = { + .label = "MIDI Gadget", + .bConfigurationValue = 1, + /* .iConfiguration = DYNAMIC */ + .bmAttributes = USB_CONFIG_ATT_ONE, + .MaxPower = CONFIG_USB_GADGET_VBUS_DRAW, +}; + +static int midi_bind_config(struct usb_configuration *c) +{ + int status; + + f_midi = usb_get_function(fi_midi); + if (IS_ERR(f_midi)) + return PTR_ERR(f_midi); + + status = usb_add_function(c, f_midi); + if (status < 0) { + usb_put_function(f_midi); + return status; + } + + return 0; +} + +static int midi_bind(struct usb_composite_dev *cdev) +{ + struct f_midi_opts *midi_opts; + int status; + + fi_midi = usb_get_function_instance("midi"); + if (IS_ERR(fi_midi)) + return PTR_ERR(fi_midi); + + midi_opts = container_of(fi_midi, struct f_midi_opts, func_inst); + midi_opts->index = index; + midi_opts->id = id; + midi_opts->in_ports = in_ports; + midi_opts->out_ports = out_ports; + midi_opts->buflen = buflen; + midi_opts->qlen = qlen; + + status = usb_string_ids_tab(cdev, strings_dev); + if (status < 0) + goto put; + device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id; + device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id; + midi_config.iConfiguration = strings_dev[STRING_DESCRIPTION_IDX].id; + + status = usb_add_config(cdev, &midi_config, midi_bind_config); + if (status < 0) + goto put; + usb_composite_overwrite_options(cdev, &coverwrite); + pr_info("%s\n", longname); + return 0; +put: + usb_put_function_instance(fi_midi); + return status; +} + +static struct usb_composite_driver midi_driver = { + .name = (char *) longname, + .dev = &device_desc, + .strings = dev_strings, + .max_speed = USB_SPEED_HIGH, + .bind = midi_bind, + .unbind = midi_unbind, +}; + +module_usb_composite_driver(midi_driver); |