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1364 lines
34 KiB
1364 lines
34 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* f_midi.c -- USB MIDI class function 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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* Rewritten for the composite framework |
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* Copyright (C) 2011 Daniel Mack <[email protected]> |
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* |
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* Based on drivers/usb/gadget/f_audio.c, |
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* Copyright (C) 2008 Bryan Wu <[email protected]> |
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* Copyright (C) 2008 Analog Devices, Inc |
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* |
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* and drivers/usb/gadget/midi.c, |
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* Copyright (C) 2006 Thumtronics Pty Ltd. |
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* Ben Williamson <[email protected]> |
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*/ |
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|
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include <linux/device.h> |
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#include <linux/kfifo.h> |
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#include <linux/spinlock.h> |
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|
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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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|
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#include <linux/usb/ch9.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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|
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#include "u_f.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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|
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static const char f_midi_shortname[] = "f_midi"; |
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static const char f_midi_longname[] = "MIDI Gadget"; |
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|
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/* |
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* We can only handle 16 cables on one single endpoint, as cable numbers are |
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* stored in 4-bit fields. And as the interface currently only holds one |
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* single endpoint, this is the maximum number of ports we can allow. |
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*/ |
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#define MAX_PORTS 16 |
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|
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/* MIDI message states */ |
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enum { |
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STATE_INITIAL = 0, /* pseudo state */ |
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STATE_1PARAM, |
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STATE_2PARAM_1, |
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STATE_2PARAM_2, |
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STATE_SYSEX_0, |
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STATE_SYSEX_1, |
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STATE_SYSEX_2, |
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STATE_REAL_TIME, |
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STATE_FINISHED, /* pseudo state */ |
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}; |
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|
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/* |
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* This is a gadget, and the IN/OUT naming is from the host's perspective. |
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* USB -> OUT endpoint -> rawmidi |
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* USB <- IN endpoint <- rawmidi |
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*/ |
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struct gmidi_in_port { |
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struct snd_rawmidi_substream *substream; |
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int active; |
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uint8_t cable; |
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uint8_t state; |
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uint8_t data[2]; |
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}; |
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|
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struct f_midi { |
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struct usb_function func; |
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struct usb_gadget *gadget; |
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struct usb_ep *in_ep, *out_ep; |
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struct snd_card *card; |
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struct snd_rawmidi *rmidi; |
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u8 ms_id; |
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|
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struct snd_rawmidi_substream *out_substream[MAX_PORTS]; |
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|
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unsigned long out_triggered; |
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struct work_struct work; |
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unsigned int in_ports; |
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unsigned int out_ports; |
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int index; |
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char *id; |
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unsigned int buflen, qlen; |
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/* This fifo is used as a buffer ring for pre-allocated IN usb_requests */ |
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DECLARE_KFIFO_PTR(in_req_fifo, struct usb_request *); |
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spinlock_t transmit_lock; |
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unsigned int in_last_port; |
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unsigned char free_ref; |
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|
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struct gmidi_in_port in_ports_array[/* in_ports */]; |
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}; |
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|
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static inline struct f_midi *func_to_midi(struct usb_function *f) |
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{ |
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return container_of(f, struct f_midi, func); |
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} |
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|
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static void f_midi_transmit(struct f_midi *midi); |
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static void f_midi_rmidi_free(struct snd_rawmidi *rmidi); |
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static void f_midi_free_inst(struct usb_function_instance *f); |
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|
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DECLARE_UAC_AC_HEADER_DESCRIPTOR(1); |
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DECLARE_USB_MIDI_OUT_JACK_DESCRIPTOR(1); |
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DECLARE_USB_MS_ENDPOINT_DESCRIPTOR(16); |
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|
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/* B.3.1 Standard AC Interface Descriptor */ |
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static struct usb_interface_descriptor ac_interface_desc = { |
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.bLength = USB_DT_INTERFACE_SIZE, |
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.bDescriptorType = USB_DT_INTERFACE, |
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/* .bInterfaceNumber = DYNAMIC */ |
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/* .bNumEndpoints = DYNAMIC */ |
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.bInterfaceClass = USB_CLASS_AUDIO, |
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.bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL, |
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/* .iInterface = DYNAMIC */ |
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}; |
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|
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/* B.3.2 Class-Specific AC Interface Descriptor */ |
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static struct uac1_ac_header_descriptor_1 ac_header_desc = { |
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.bLength = UAC_DT_AC_HEADER_SIZE(1), |
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.bDescriptorType = USB_DT_CS_INTERFACE, |
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.bDescriptorSubtype = USB_MS_HEADER, |
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.bcdADC = cpu_to_le16(0x0100), |
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.wTotalLength = cpu_to_le16(UAC_DT_AC_HEADER_SIZE(1)), |
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.bInCollection = 1, |
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/* .baInterfaceNr = DYNAMIC */ |
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}; |
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|
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/* B.4.1 Standard MS Interface Descriptor */ |
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static struct usb_interface_descriptor ms_interface_desc = { |
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.bLength = USB_DT_INTERFACE_SIZE, |
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.bDescriptorType = USB_DT_INTERFACE, |
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/* .bInterfaceNumber = DYNAMIC */ |
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.bNumEndpoints = 2, |
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.bInterfaceClass = USB_CLASS_AUDIO, |
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.bInterfaceSubClass = USB_SUBCLASS_MIDISTREAMING, |
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/* .iInterface = DYNAMIC */ |
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}; |
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|
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/* B.4.2 Class-Specific MS Interface Descriptor */ |
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static struct usb_ms_header_descriptor ms_header_desc = { |
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.bLength = USB_DT_MS_HEADER_SIZE, |
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.bDescriptorType = USB_DT_CS_INTERFACE, |
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.bDescriptorSubtype = USB_MS_HEADER, |
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.bcdMSC = cpu_to_le16(0x0100), |
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/* .wTotalLength = DYNAMIC */ |
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}; |
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|
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/* B.5.1 Standard Bulk OUT Endpoint Descriptor */ |
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static struct usb_endpoint_descriptor bulk_out_desc = { |
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.bLength = USB_DT_ENDPOINT_AUDIO_SIZE, |
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.bDescriptorType = USB_DT_ENDPOINT, |
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.bEndpointAddress = USB_DIR_OUT, |
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.bmAttributes = USB_ENDPOINT_XFER_BULK, |
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}; |
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static struct usb_ss_ep_comp_descriptor bulk_out_ss_comp_desc = { |
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.bLength = sizeof(bulk_out_ss_comp_desc), |
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.bDescriptorType = USB_DT_SS_ENDPOINT_COMP, |
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/* .bMaxBurst = 0, */ |
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/* .bmAttributes = 0, */ |
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}; |
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|
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/* B.5.2 Class-specific MS Bulk OUT Endpoint Descriptor */ |
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static struct usb_ms_endpoint_descriptor_16 ms_out_desc = { |
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/* .bLength = DYNAMIC */ |
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.bDescriptorType = USB_DT_CS_ENDPOINT, |
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.bDescriptorSubtype = USB_MS_GENERAL, |
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/* .bNumEmbMIDIJack = DYNAMIC */ |
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/* .baAssocJackID = DYNAMIC */ |
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}; |
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|
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/* B.6.1 Standard Bulk IN Endpoint Descriptor */ |
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static struct usb_endpoint_descriptor bulk_in_desc = { |
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.bLength = USB_DT_ENDPOINT_AUDIO_SIZE, |
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.bDescriptorType = USB_DT_ENDPOINT, |
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.bEndpointAddress = USB_DIR_IN, |
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.bmAttributes = USB_ENDPOINT_XFER_BULK, |
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}; |
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static struct usb_ss_ep_comp_descriptor bulk_in_ss_comp_desc = { |
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.bLength = sizeof(bulk_in_ss_comp_desc), |
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.bDescriptorType = USB_DT_SS_ENDPOINT_COMP, |
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/* .bMaxBurst = 0, */ |
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/* .bmAttributes = 0, */ |
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}; |
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|
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/* B.6.2 Class-specific MS Bulk IN Endpoint Descriptor */ |
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static struct usb_ms_endpoint_descriptor_16 ms_in_desc = { |
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/* .bLength = DYNAMIC */ |
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.bDescriptorType = USB_DT_CS_ENDPOINT, |
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.bDescriptorSubtype = USB_MS_GENERAL, |
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/* .bNumEmbMIDIJack = DYNAMIC */ |
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/* .baAssocJackID = DYNAMIC */ |
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}; |
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|
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/* string IDs are assigned dynamically */ |
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#define STRING_FUNC_IDX 0 |
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static struct usb_string midi_string_defs[] = { |
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[STRING_FUNC_IDX].s = "MIDI function", |
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{ } /* end of list */ |
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}; |
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|
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static struct usb_gadget_strings midi_stringtab = { |
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.language = 0x0409, /* en-us */ |
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.strings = midi_string_defs, |
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}; |
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|
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static struct usb_gadget_strings *midi_strings[] = { |
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&midi_stringtab, |
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NULL, |
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}; |
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static inline struct usb_request *midi_alloc_ep_req(struct usb_ep *ep, |
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unsigned length) |
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{ |
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return alloc_ep_req(ep, length); |
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} |
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static const uint8_t f_midi_cin_length[] = { |
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0, 0, 2, 3, 3, 1, 2, 3, 3, 3, 3, 3, 2, 2, 3, 1 |
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}; |
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|
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/* |
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* Receives a chunk of MIDI data. |
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*/ |
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static void f_midi_read_data(struct usb_ep *ep, int cable, |
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uint8_t *data, int length) |
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{ |
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struct f_midi *midi = ep->driver_data; |
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struct snd_rawmidi_substream *substream = midi->out_substream[cable]; |
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|
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if (!substream) |
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/* Nobody is listening - throw it on the floor. */ |
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return; |
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if (!test_bit(cable, &midi->out_triggered)) |
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return; |
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snd_rawmidi_receive(substream, data, length); |
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} |
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static void f_midi_handle_out_data(struct usb_ep *ep, struct usb_request *req) |
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{ |
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unsigned int i; |
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u8 *buf = req->buf; |
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|
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for (i = 0; i + 3 < req->actual; i += 4) |
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if (buf[i] != 0) { |
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int cable = buf[i] >> 4; |
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int length = f_midi_cin_length[buf[i] & 0x0f]; |
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f_midi_read_data(ep, cable, &buf[i + 1], length); |
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} |
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} |
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|
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static void |
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f_midi_complete(struct usb_ep *ep, struct usb_request *req) |
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{ |
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struct f_midi *midi = ep->driver_data; |
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struct usb_composite_dev *cdev = midi->func.config->cdev; |
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int status = req->status; |
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switch (status) { |
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case 0: /* normal completion */ |
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if (ep == midi->out_ep) { |
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/* We received stuff. req is queued again, below */ |
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f_midi_handle_out_data(ep, req); |
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} else if (ep == midi->in_ep) { |
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/* Our transmit completed. See if there's more to go. |
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* f_midi_transmit eats req, don't queue it again. */ |
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req->length = 0; |
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f_midi_transmit(midi); |
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return; |
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} |
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break; |
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|
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/* this endpoint is normally active while we're configured */ |
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case -ECONNABORTED: /* hardware forced ep reset */ |
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case -ECONNRESET: /* request dequeued */ |
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case -ESHUTDOWN: /* disconnect from host */ |
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VDBG(cdev, "%s gone (%d), %d/%d\n", ep->name, status, |
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req->actual, req->length); |
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if (ep == midi->out_ep) { |
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f_midi_handle_out_data(ep, req); |
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/* We don't need to free IN requests because it's handled |
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* by the midi->in_req_fifo. */ |
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free_ep_req(ep, req); |
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} |
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return; |
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|
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case -EOVERFLOW: /* buffer overrun on read means that |
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* we didn't provide a big enough buffer. |
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*/ |
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default: |
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DBG(cdev, "%s complete --> %d, %d/%d\n", ep->name, |
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status, req->actual, req->length); |
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break; |
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case -EREMOTEIO: /* short read */ |
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break; |
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} |
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status = usb_ep_queue(ep, req, GFP_ATOMIC); |
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if (status) { |
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ERROR(cdev, "kill %s: resubmit %d bytes --> %d\n", |
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ep->name, req->length, status); |
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usb_ep_set_halt(ep); |
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/* FIXME recover later ... somehow */ |
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} |
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} |
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static void f_midi_drop_out_substreams(struct f_midi *midi) |
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{ |
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unsigned int i; |
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|
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for (i = 0; i < midi->in_ports; i++) { |
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struct gmidi_in_port *port = midi->in_ports_array + i; |
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struct snd_rawmidi_substream *substream = port->substream; |
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|
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if (port->active && substream) |
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snd_rawmidi_drop_output(substream); |
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} |
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} |
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|
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static int f_midi_start_ep(struct f_midi *midi, |
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struct usb_function *f, |
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struct usb_ep *ep) |
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{ |
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int err; |
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struct usb_composite_dev *cdev = f->config->cdev; |
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|
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usb_ep_disable(ep); |
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|
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err = config_ep_by_speed(midi->gadget, f, ep); |
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if (err) { |
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ERROR(cdev, "can't configure %s: %d\n", ep->name, err); |
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return err; |
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} |
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err = usb_ep_enable(ep); |
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if (err) { |
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ERROR(cdev, "can't start %s: %d\n", ep->name, err); |
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return err; |
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} |
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ep->driver_data = midi; |
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return 0; |
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} |
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|
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static int f_midi_set_alt(struct usb_function *f, unsigned intf, unsigned alt) |
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{ |
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struct f_midi *midi = func_to_midi(f); |
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unsigned i; |
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int err; |
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|
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/* we only set alt for MIDIStreaming interface */ |
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if (intf != midi->ms_id) |
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return 0; |
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err = f_midi_start_ep(midi, f, midi->in_ep); |
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if (err) |
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return err; |
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err = f_midi_start_ep(midi, f, midi->out_ep); |
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if (err) |
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return err; |
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|
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/* pre-allocate write usb requests to use on f_midi_transmit. */ |
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while (kfifo_avail(&midi->in_req_fifo)) { |
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struct usb_request *req = |
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midi_alloc_ep_req(midi->in_ep, midi->buflen); |
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|
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if (req == NULL) |
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return -ENOMEM; |
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req->length = 0; |
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req->complete = f_midi_complete; |
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kfifo_put(&midi->in_req_fifo, req); |
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} |
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|
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/* allocate a bunch of read buffers and queue them all at once. */ |
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for (i = 0; i < midi->qlen && err == 0; i++) { |
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struct usb_request *req = |
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midi_alloc_ep_req(midi->out_ep, midi->buflen); |
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|
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if (req == NULL) |
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return -ENOMEM; |
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req->complete = f_midi_complete; |
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err = usb_ep_queue(midi->out_ep, req, GFP_ATOMIC); |
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if (err) { |
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ERROR(midi, "%s: couldn't enqueue request: %d\n", |
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midi->out_ep->name, err); |
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if (req->buf != NULL) |
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free_ep_req(midi->out_ep, req); |
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return err; |
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} |
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} |
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|
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return 0; |
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} |
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|
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static void f_midi_disable(struct usb_function *f) |
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{ |
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struct f_midi *midi = func_to_midi(f); |
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struct usb_composite_dev *cdev = f->config->cdev; |
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struct usb_request *req = NULL; |
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|
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DBG(cdev, "disable\n"); |
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|
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/* |
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* just disable endpoints, forcing completion of pending i/o. |
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* all our completion handlers free their requests in this case. |
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*/ |
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usb_ep_disable(midi->in_ep); |
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usb_ep_disable(midi->out_ep); |
|
|
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/* release IN requests */ |
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while (kfifo_get(&midi->in_req_fifo, &req)) |
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free_ep_req(midi->in_ep, req); |
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|
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f_midi_drop_out_substreams(midi); |
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} |
|
|
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static int f_midi_snd_free(struct snd_device *device) |
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{ |
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return 0; |
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} |
|
|
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/* |
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* Converts MIDI commands to USB MIDI packets. |
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*/ |
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static void f_midi_transmit_byte(struct usb_request *req, |
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struct gmidi_in_port *port, uint8_t b) |
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{ |
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uint8_t p[4] = { port->cable << 4, 0, 0, 0 }; |
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uint8_t next_state = STATE_INITIAL; |
|
|
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switch (b) { |
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case 0xf8 ... 0xff: |
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/* System Real-Time Messages */ |
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p[0] |= 0x0f; |
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p[1] = b; |
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next_state = port->state; |
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port->state = STATE_REAL_TIME; |
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break; |
|
|
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case 0xf7: |
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/* End of SysEx */ |
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switch (port->state) { |
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case STATE_SYSEX_0: |
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p[0] |= 0x05; |
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p[1] = 0xf7; |
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next_state = STATE_FINISHED; |
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break; |
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case STATE_SYSEX_1: |
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p[0] |= 0x06; |
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p[1] = port->data[0]; |
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p[2] = 0xf7; |
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next_state = STATE_FINISHED; |
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break; |
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case STATE_SYSEX_2: |
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p[0] |= 0x07; |
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p[1] = port->data[0]; |
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p[2] = port->data[1]; |
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p[3] = 0xf7; |
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next_state = STATE_FINISHED; |
|
break; |
|
default: |
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/* Ignore byte */ |
|
next_state = port->state; |
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port->state = STATE_INITIAL; |
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} |
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break; |
|
|
|
case 0xf0 ... 0xf6: |
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/* System Common Messages */ |
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port->data[0] = port->data[1] = 0; |
|
port->state = STATE_INITIAL; |
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switch (b) { |
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case 0xf0: |
|
port->data[0] = b; |
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port->data[1] = 0; |
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next_state = STATE_SYSEX_1; |
|
break; |
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case 0xf1: |
|
case 0xf3: |
|
port->data[0] = b; |
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next_state = STATE_1PARAM; |
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break; |
|
case 0xf2: |
|
port->data[0] = b; |
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next_state = STATE_2PARAM_1; |
|
break; |
|
case 0xf4: |
|
case 0xf5: |
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next_state = STATE_INITIAL; |
|
break; |
|
case 0xf6: |
|
p[0] |= 0x05; |
|
p[1] = 0xf6; |
|
next_state = STATE_FINISHED; |
|
break; |
|
} |
|
break; |
|
|
|
case 0x80 ... 0xef: |
|
/* |
|
* Channel Voice Messages, Channel Mode Messages |
|
* and Control Change Messages. |
|
*/ |
|
port->data[0] = b; |
|
port->data[1] = 0; |
|
port->state = STATE_INITIAL; |
|
if (b >= 0xc0 && b <= 0xdf) |
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next_state = STATE_1PARAM; |
|
else |
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next_state = STATE_2PARAM_1; |
|
break; |
|
|
|
case 0x00 ... 0x7f: |
|
/* Message parameters */ |
|
switch (port->state) { |
|
case STATE_1PARAM: |
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if (port->data[0] < 0xf0) |
|
p[0] |= port->data[0] >> 4; |
|
else |
|
p[0] |= 0x02; |
|
|
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p[1] = port->data[0]; |
|
p[2] = b; |
|
/* This is to allow Running State Messages */ |
|
next_state = STATE_1PARAM; |
|
break; |
|
case STATE_2PARAM_1: |
|
port->data[1] = b; |
|
next_state = STATE_2PARAM_2; |
|
break; |
|
case STATE_2PARAM_2: |
|
if (port->data[0] < 0xf0) |
|
p[0] |= port->data[0] >> 4; |
|
else |
|
p[0] |= 0x03; |
|
|
|
p[1] = port->data[0]; |
|
p[2] = port->data[1]; |
|
p[3] = b; |
|
/* This is to allow Running State Messages */ |
|
next_state = STATE_2PARAM_1; |
|
break; |
|
case STATE_SYSEX_0: |
|
port->data[0] = b; |
|
next_state = STATE_SYSEX_1; |
|
break; |
|
case STATE_SYSEX_1: |
|
port->data[1] = b; |
|
next_state = STATE_SYSEX_2; |
|
break; |
|
case STATE_SYSEX_2: |
|
p[0] |= 0x04; |
|
p[1] = port->data[0]; |
|
p[2] = port->data[1]; |
|
p[3] = b; |
|
next_state = STATE_SYSEX_0; |
|
break; |
|
} |
|
break; |
|
} |
|
|
|
/* States where we have to write into the USB request */ |
|
if (next_state == STATE_FINISHED || |
|
port->state == STATE_SYSEX_2 || |
|
port->state == STATE_1PARAM || |
|
port->state == STATE_2PARAM_2 || |
|
port->state == STATE_REAL_TIME) { |
|
|
|
unsigned int length = req->length; |
|
u8 *buf = (u8 *)req->buf + length; |
|
|
|
memcpy(buf, p, sizeof(p)); |
|
req->length = length + sizeof(p); |
|
|
|
if (next_state == STATE_FINISHED) { |
|
next_state = STATE_INITIAL; |
|
port->data[0] = port->data[1] = 0; |
|
} |
|
} |
|
|
|
port->state = next_state; |
|
} |
|
|
|
static int f_midi_do_transmit(struct f_midi *midi, struct usb_ep *ep) |
|
{ |
|
struct usb_request *req = NULL; |
|
unsigned int len, i; |
|
bool active = false; |
|
int err; |
|
|
|
/* |
|
* We peek the request in order to reuse it if it fails to enqueue on |
|
* its endpoint |
|
*/ |
|
len = kfifo_peek(&midi->in_req_fifo, &req); |
|
if (len != 1) { |
|
ERROR(midi, "%s: Couldn't get usb request\n", __func__); |
|
return -1; |
|
} |
|
|
|
/* |
|
* If buffer overrun, then we ignore this transmission. |
|
* IMPORTANT: This will cause the user-space rawmidi device to block |
|
* until a) usb requests have been completed or b) snd_rawmidi_write() |
|
* times out. |
|
*/ |
|
if (req->length > 0) |
|
return 0; |
|
|
|
for (i = midi->in_last_port; i < midi->in_ports; ++i) { |
|
struct gmidi_in_port *port = midi->in_ports_array + i; |
|
struct snd_rawmidi_substream *substream = port->substream; |
|
|
|
if (!port->active || !substream) |
|
continue; |
|
|
|
while (req->length + 3 < midi->buflen) { |
|
uint8_t b; |
|
|
|
if (snd_rawmidi_transmit(substream, &b, 1) != 1) { |
|
port->active = 0; |
|
break; |
|
} |
|
f_midi_transmit_byte(req, port, b); |
|
} |
|
|
|
active = !!port->active; |
|
if (active) |
|
break; |
|
} |
|
midi->in_last_port = active ? i : 0; |
|
|
|
if (req->length <= 0) |
|
goto done; |
|
|
|
err = usb_ep_queue(ep, req, GFP_ATOMIC); |
|
if (err < 0) { |
|
ERROR(midi, "%s failed to queue req: %d\n", |
|
midi->in_ep->name, err); |
|
req->length = 0; /* Re-use request next time. */ |
|
} else { |
|
/* Upon success, put request at the back of the queue. */ |
|
kfifo_skip(&midi->in_req_fifo); |
|
kfifo_put(&midi->in_req_fifo, req); |
|
} |
|
|
|
done: |
|
return active; |
|
} |
|
|
|
static void f_midi_transmit(struct f_midi *midi) |
|
{ |
|
struct usb_ep *ep = midi->in_ep; |
|
int ret; |
|
unsigned long flags; |
|
|
|
/* We only care about USB requests if IN endpoint is enabled */ |
|
if (!ep || !ep->enabled) |
|
goto drop_out; |
|
|
|
spin_lock_irqsave(&midi->transmit_lock, flags); |
|
|
|
do { |
|
ret = f_midi_do_transmit(midi, ep); |
|
if (ret < 0) { |
|
spin_unlock_irqrestore(&midi->transmit_lock, flags); |
|
goto drop_out; |
|
} |
|
} while (ret); |
|
|
|
spin_unlock_irqrestore(&midi->transmit_lock, flags); |
|
|
|
return; |
|
|
|
drop_out: |
|
f_midi_drop_out_substreams(midi); |
|
} |
|
|
|
static void f_midi_in_work(struct work_struct *work) |
|
{ |
|
struct f_midi *midi; |
|
|
|
midi = container_of(work, struct f_midi, work); |
|
f_midi_transmit(midi); |
|
} |
|
|
|
static int f_midi_in_open(struct snd_rawmidi_substream *substream) |
|
{ |
|
struct f_midi *midi = substream->rmidi->private_data; |
|
struct gmidi_in_port *port; |
|
|
|
if (substream->number >= midi->in_ports) |
|
return -EINVAL; |
|
|
|
VDBG(midi, "%s()\n", __func__); |
|
port = midi->in_ports_array + substream->number; |
|
port->substream = substream; |
|
port->state = STATE_INITIAL; |
|
return 0; |
|
} |
|
|
|
static int f_midi_in_close(struct snd_rawmidi_substream *substream) |
|
{ |
|
struct f_midi *midi = substream->rmidi->private_data; |
|
|
|
VDBG(midi, "%s()\n", __func__); |
|
return 0; |
|
} |
|
|
|
static void f_midi_in_trigger(struct snd_rawmidi_substream *substream, int up) |
|
{ |
|
struct f_midi *midi = substream->rmidi->private_data; |
|
|
|
if (substream->number >= midi->in_ports) |
|
return; |
|
|
|
VDBG(midi, "%s() %d\n", __func__, up); |
|
midi->in_ports_array[substream->number].active = up; |
|
if (up) |
|
queue_work(system_highpri_wq, &midi->work); |
|
} |
|
|
|
static int f_midi_out_open(struct snd_rawmidi_substream *substream) |
|
{ |
|
struct f_midi *midi = substream->rmidi->private_data; |
|
|
|
if (substream->number >= MAX_PORTS) |
|
return -EINVAL; |
|
|
|
VDBG(midi, "%s()\n", __func__); |
|
midi->out_substream[substream->number] = substream; |
|
return 0; |
|
} |
|
|
|
static int f_midi_out_close(struct snd_rawmidi_substream *substream) |
|
{ |
|
struct f_midi *midi = substream->rmidi->private_data; |
|
|
|
VDBG(midi, "%s()\n", __func__); |
|
return 0; |
|
} |
|
|
|
static void f_midi_out_trigger(struct snd_rawmidi_substream *substream, int up) |
|
{ |
|
struct f_midi *midi = substream->rmidi->private_data; |
|
|
|
VDBG(midi, "%s()\n", __func__); |
|
|
|
if (up) |
|
set_bit(substream->number, &midi->out_triggered); |
|
else |
|
clear_bit(substream->number, &midi->out_triggered); |
|
} |
|
|
|
static const struct snd_rawmidi_ops gmidi_in_ops = { |
|
.open = f_midi_in_open, |
|
.close = f_midi_in_close, |
|
.trigger = f_midi_in_trigger, |
|
}; |
|
|
|
static const struct snd_rawmidi_ops gmidi_out_ops = { |
|
.open = f_midi_out_open, |
|
.close = f_midi_out_close, |
|
.trigger = f_midi_out_trigger |
|
}; |
|
|
|
static inline void f_midi_unregister_card(struct f_midi *midi) |
|
{ |
|
if (midi->card) { |
|
snd_card_free(midi->card); |
|
midi->card = NULL; |
|
} |
|
} |
|
|
|
/* register as a sound "card" */ |
|
static int f_midi_register_card(struct f_midi *midi) |
|
{ |
|
struct snd_card *card; |
|
struct snd_rawmidi *rmidi; |
|
int err; |
|
static struct snd_device_ops ops = { |
|
.dev_free = f_midi_snd_free, |
|
}; |
|
|
|
err = snd_card_new(&midi->gadget->dev, midi->index, midi->id, |
|
THIS_MODULE, 0, &card); |
|
if (err < 0) { |
|
ERROR(midi, "snd_card_new() failed\n"); |
|
goto fail; |
|
} |
|
midi->card = card; |
|
|
|
err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, midi, &ops); |
|
if (err < 0) { |
|
ERROR(midi, "snd_device_new() failed: error %d\n", err); |
|
goto fail; |
|
} |
|
|
|
strcpy(card->driver, f_midi_longname); |
|
strcpy(card->longname, f_midi_longname); |
|
strcpy(card->shortname, f_midi_shortname); |
|
|
|
/* Set up rawmidi */ |
|
snd_component_add(card, "MIDI"); |
|
err = snd_rawmidi_new(card, card->longname, 0, |
|
midi->out_ports, midi->in_ports, &rmidi); |
|
if (err < 0) { |
|
ERROR(midi, "snd_rawmidi_new() failed: error %d\n", err); |
|
goto fail; |
|
} |
|
midi->rmidi = rmidi; |
|
midi->in_last_port = 0; |
|
strcpy(rmidi->name, card->shortname); |
|
rmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT | |
|
SNDRV_RAWMIDI_INFO_INPUT | |
|
SNDRV_RAWMIDI_INFO_DUPLEX; |
|
rmidi->private_data = midi; |
|
rmidi->private_free = f_midi_rmidi_free; |
|
midi->free_ref++; |
|
|
|
/* |
|
* Yes, rawmidi OUTPUT = USB IN, and rawmidi INPUT = USB OUT. |
|
* It's an upside-down world being a gadget. |
|
*/ |
|
snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &gmidi_in_ops); |
|
snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &gmidi_out_ops); |
|
|
|
/* register it - we're ready to go */ |
|
err = snd_card_register(card); |
|
if (err < 0) { |
|
ERROR(midi, "snd_card_register() failed\n"); |
|
goto fail; |
|
} |
|
|
|
VDBG(midi, "%s() finished ok\n", __func__); |
|
return 0; |
|
|
|
fail: |
|
f_midi_unregister_card(midi); |
|
return err; |
|
} |
|
|
|
/* MIDI function driver setup/binding */ |
|
|
|
static int f_midi_bind(struct usb_configuration *c, struct usb_function *f) |
|
{ |
|
struct usb_descriptor_header **midi_function; |
|
struct usb_midi_in_jack_descriptor jack_in_ext_desc[MAX_PORTS]; |
|
struct usb_midi_in_jack_descriptor jack_in_emb_desc[MAX_PORTS]; |
|
struct usb_midi_out_jack_descriptor_1 jack_out_ext_desc[MAX_PORTS]; |
|
struct usb_midi_out_jack_descriptor_1 jack_out_emb_desc[MAX_PORTS]; |
|
struct usb_composite_dev *cdev = c->cdev; |
|
struct f_midi *midi = func_to_midi(f); |
|
struct usb_string *us; |
|
int status, n, jack = 1, i = 0, endpoint_descriptor_index = 0; |
|
|
|
midi->gadget = cdev->gadget; |
|
INIT_WORK(&midi->work, f_midi_in_work); |
|
status = f_midi_register_card(midi); |
|
if (status < 0) |
|
goto fail_register; |
|
|
|
/* maybe allocate device-global string ID */ |
|
us = usb_gstrings_attach(c->cdev, midi_strings, |
|
ARRAY_SIZE(midi_string_defs)); |
|
if (IS_ERR(us)) { |
|
status = PTR_ERR(us); |
|
goto fail; |
|
} |
|
ac_interface_desc.iInterface = us[STRING_FUNC_IDX].id; |
|
|
|
/* We have two interfaces, AudioControl and MIDIStreaming */ |
|
status = usb_interface_id(c, f); |
|
if (status < 0) |
|
goto fail; |
|
ac_interface_desc.bInterfaceNumber = status; |
|
|
|
status = usb_interface_id(c, f); |
|
if (status < 0) |
|
goto fail; |
|
ms_interface_desc.bInterfaceNumber = status; |
|
ac_header_desc.baInterfaceNr[0] = status; |
|
midi->ms_id = status; |
|
|
|
status = -ENODEV; |
|
|
|
/* allocate instance-specific endpoints */ |
|
midi->in_ep = usb_ep_autoconfig(cdev->gadget, &bulk_in_desc); |
|
if (!midi->in_ep) |
|
goto fail; |
|
|
|
midi->out_ep = usb_ep_autoconfig(cdev->gadget, &bulk_out_desc); |
|
if (!midi->out_ep) |
|
goto fail; |
|
|
|
/* allocate temporary function list */ |
|
midi_function = kcalloc((MAX_PORTS * 4) + 11, sizeof(*midi_function), |
|
GFP_KERNEL); |
|
if (!midi_function) { |
|
status = -ENOMEM; |
|
goto fail; |
|
} |
|
|
|
/* |
|
* construct the function's descriptor set. As the number of |
|
* input and output MIDI ports is configurable, we have to do |
|
* it that way. |
|
*/ |
|
|
|
/* add the headers - these are always the same */ |
|
midi_function[i++] = (struct usb_descriptor_header *) &ac_interface_desc; |
|
midi_function[i++] = (struct usb_descriptor_header *) &ac_header_desc; |
|
midi_function[i++] = (struct usb_descriptor_header *) &ms_interface_desc; |
|
|
|
/* calculate the header's wTotalLength */ |
|
n = USB_DT_MS_HEADER_SIZE |
|
+ (midi->in_ports + midi->out_ports) * |
|
(USB_DT_MIDI_IN_SIZE + USB_DT_MIDI_OUT_SIZE(1)); |
|
ms_header_desc.wTotalLength = cpu_to_le16(n); |
|
|
|
midi_function[i++] = (struct usb_descriptor_header *) &ms_header_desc; |
|
|
|
/* configure the external IN jacks, each linked to an embedded OUT jack */ |
|
for (n = 0; n < midi->in_ports; n++) { |
|
struct usb_midi_in_jack_descriptor *in_ext = &jack_in_ext_desc[n]; |
|
struct usb_midi_out_jack_descriptor_1 *out_emb = &jack_out_emb_desc[n]; |
|
|
|
in_ext->bLength = USB_DT_MIDI_IN_SIZE; |
|
in_ext->bDescriptorType = USB_DT_CS_INTERFACE; |
|
in_ext->bDescriptorSubtype = USB_MS_MIDI_IN_JACK; |
|
in_ext->bJackType = USB_MS_EXTERNAL; |
|
in_ext->bJackID = jack++; |
|
in_ext->iJack = 0; |
|
midi_function[i++] = (struct usb_descriptor_header *) in_ext; |
|
|
|
out_emb->bLength = USB_DT_MIDI_OUT_SIZE(1); |
|
out_emb->bDescriptorType = USB_DT_CS_INTERFACE; |
|
out_emb->bDescriptorSubtype = USB_MS_MIDI_OUT_JACK; |
|
out_emb->bJackType = USB_MS_EMBEDDED; |
|
out_emb->bJackID = jack++; |
|
out_emb->bNrInputPins = 1; |
|
out_emb->pins[0].baSourcePin = 1; |
|
out_emb->pins[0].baSourceID = in_ext->bJackID; |
|
out_emb->iJack = 0; |
|
midi_function[i++] = (struct usb_descriptor_header *) out_emb; |
|
|
|
/* link it to the endpoint */ |
|
ms_in_desc.baAssocJackID[n] = out_emb->bJackID; |
|
} |
|
|
|
/* configure the external OUT jacks, each linked to an embedded IN jack */ |
|
for (n = 0; n < midi->out_ports; n++) { |
|
struct usb_midi_in_jack_descriptor *in_emb = &jack_in_emb_desc[n]; |
|
struct usb_midi_out_jack_descriptor_1 *out_ext = &jack_out_ext_desc[n]; |
|
|
|
in_emb->bLength = USB_DT_MIDI_IN_SIZE; |
|
in_emb->bDescriptorType = USB_DT_CS_INTERFACE; |
|
in_emb->bDescriptorSubtype = USB_MS_MIDI_IN_JACK; |
|
in_emb->bJackType = USB_MS_EMBEDDED; |
|
in_emb->bJackID = jack++; |
|
in_emb->iJack = 0; |
|
midi_function[i++] = (struct usb_descriptor_header *) in_emb; |
|
|
|
out_ext->bLength = USB_DT_MIDI_OUT_SIZE(1); |
|
out_ext->bDescriptorType = USB_DT_CS_INTERFACE; |
|
out_ext->bDescriptorSubtype = USB_MS_MIDI_OUT_JACK; |
|
out_ext->bJackType = USB_MS_EXTERNAL; |
|
out_ext->bJackID = jack++; |
|
out_ext->bNrInputPins = 1; |
|
out_ext->iJack = 0; |
|
out_ext->pins[0].baSourceID = in_emb->bJackID; |
|
out_ext->pins[0].baSourcePin = 1; |
|
midi_function[i++] = (struct usb_descriptor_header *) out_ext; |
|
|
|
/* link it to the endpoint */ |
|
ms_out_desc.baAssocJackID[n] = in_emb->bJackID; |
|
} |
|
|
|
/* configure the endpoint descriptors ... */ |
|
ms_out_desc.bLength = USB_DT_MS_ENDPOINT_SIZE(midi->in_ports); |
|
ms_out_desc.bNumEmbMIDIJack = midi->in_ports; |
|
|
|
ms_in_desc.bLength = USB_DT_MS_ENDPOINT_SIZE(midi->out_ports); |
|
ms_in_desc.bNumEmbMIDIJack = midi->out_ports; |
|
|
|
/* ... and add them to the list */ |
|
endpoint_descriptor_index = i; |
|
midi_function[i++] = (struct usb_descriptor_header *) &bulk_out_desc; |
|
midi_function[i++] = (struct usb_descriptor_header *) &ms_out_desc; |
|
midi_function[i++] = (struct usb_descriptor_header *) &bulk_in_desc; |
|
midi_function[i++] = (struct usb_descriptor_header *) &ms_in_desc; |
|
midi_function[i++] = NULL; |
|
|
|
/* |
|
* support all relevant hardware speeds... we expect that when |
|
* hardware is dual speed, all bulk-capable endpoints work at |
|
* both speeds |
|
*/ |
|
/* copy descriptors, and track endpoint copies */ |
|
f->fs_descriptors = usb_copy_descriptors(midi_function); |
|
if (!f->fs_descriptors) |
|
goto fail_f_midi; |
|
|
|
if (gadget_is_dualspeed(c->cdev->gadget)) { |
|
bulk_in_desc.wMaxPacketSize = cpu_to_le16(512); |
|
bulk_out_desc.wMaxPacketSize = cpu_to_le16(512); |
|
f->hs_descriptors = usb_copy_descriptors(midi_function); |
|
if (!f->hs_descriptors) |
|
goto fail_f_midi; |
|
} |
|
|
|
if (gadget_is_superspeed(c->cdev->gadget)) { |
|
bulk_in_desc.wMaxPacketSize = cpu_to_le16(1024); |
|
bulk_out_desc.wMaxPacketSize = cpu_to_le16(1024); |
|
i = endpoint_descriptor_index; |
|
midi_function[i++] = (struct usb_descriptor_header *) |
|
&bulk_out_desc; |
|
midi_function[i++] = (struct usb_descriptor_header *) |
|
&bulk_out_ss_comp_desc; |
|
midi_function[i++] = (struct usb_descriptor_header *) |
|
&ms_out_desc; |
|
midi_function[i++] = (struct usb_descriptor_header *) |
|
&bulk_in_desc; |
|
midi_function[i++] = (struct usb_descriptor_header *) |
|
&bulk_in_ss_comp_desc; |
|
midi_function[i++] = (struct usb_descriptor_header *) |
|
&ms_in_desc; |
|
f->ss_descriptors = usb_copy_descriptors(midi_function); |
|
if (!f->ss_descriptors) |
|
goto fail_f_midi; |
|
|
|
if (gadget_is_superspeed_plus(c->cdev->gadget)) { |
|
f->ssp_descriptors = usb_copy_descriptors(midi_function); |
|
if (!f->ssp_descriptors) |
|
goto fail_f_midi; |
|
} |
|
} |
|
|
|
kfree(midi_function); |
|
|
|
return 0; |
|
|
|
fail_f_midi: |
|
kfree(midi_function); |
|
usb_free_all_descriptors(f); |
|
fail: |
|
f_midi_unregister_card(midi); |
|
fail_register: |
|
ERROR(cdev, "%s: can't bind, err %d\n", f->name, status); |
|
|
|
return status; |
|
} |
|
|
|
static inline struct f_midi_opts *to_f_midi_opts(struct config_item *item) |
|
{ |
|
return container_of(to_config_group(item), struct f_midi_opts, |
|
func_inst.group); |
|
} |
|
|
|
static void midi_attr_release(struct config_item *item) |
|
{ |
|
struct f_midi_opts *opts = to_f_midi_opts(item); |
|
|
|
usb_put_function_instance(&opts->func_inst); |
|
} |
|
|
|
static struct configfs_item_operations midi_item_ops = { |
|
.release = midi_attr_release, |
|
}; |
|
|
|
#define F_MIDI_OPT(name, test_limit, limit) \ |
|
static ssize_t f_midi_opts_##name##_show(struct config_item *item, char *page) \ |
|
{ \ |
|
struct f_midi_opts *opts = to_f_midi_opts(item); \ |
|
int result; \ |
|
\ |
|
mutex_lock(&opts->lock); \ |
|
result = sprintf(page, "%d\n", opts->name); \ |
|
mutex_unlock(&opts->lock); \ |
|
\ |
|
return result; \ |
|
} \ |
|
\ |
|
static ssize_t f_midi_opts_##name##_store(struct config_item *item, \ |
|
const char *page, size_t len) \ |
|
{ \ |
|
struct f_midi_opts *opts = to_f_midi_opts(item); \ |
|
int ret; \ |
|
u32 num; \ |
|
\ |
|
mutex_lock(&opts->lock); \ |
|
if (opts->refcnt > 1) { \ |
|
ret = -EBUSY; \ |
|
goto end; \ |
|
} \ |
|
\ |
|
ret = kstrtou32(page, 0, &num); \ |
|
if (ret) \ |
|
goto end; \ |
|
\ |
|
if (test_limit && num > limit) { \ |
|
ret = -EINVAL; \ |
|
goto end; \ |
|
} \ |
|
opts->name = num; \ |
|
ret = len; \ |
|
\ |
|
end: \ |
|
mutex_unlock(&opts->lock); \ |
|
return ret; \ |
|
} \ |
|
\ |
|
CONFIGFS_ATTR(f_midi_opts_, name); |
|
|
|
F_MIDI_OPT(index, true, SNDRV_CARDS); |
|
F_MIDI_OPT(buflen, false, 0); |
|
F_MIDI_OPT(qlen, false, 0); |
|
F_MIDI_OPT(in_ports, true, MAX_PORTS); |
|
F_MIDI_OPT(out_ports, true, MAX_PORTS); |
|
|
|
static ssize_t f_midi_opts_id_show(struct config_item *item, char *page) |
|
{ |
|
struct f_midi_opts *opts = to_f_midi_opts(item); |
|
int result; |
|
|
|
mutex_lock(&opts->lock); |
|
if (opts->id) { |
|
result = strlcpy(page, opts->id, PAGE_SIZE); |
|
} else { |
|
page[0] = 0; |
|
result = 0; |
|
} |
|
|
|
mutex_unlock(&opts->lock); |
|
|
|
return result; |
|
} |
|
|
|
static ssize_t f_midi_opts_id_store(struct config_item *item, |
|
const char *page, size_t len) |
|
{ |
|
struct f_midi_opts *opts = to_f_midi_opts(item); |
|
int ret; |
|
char *c; |
|
|
|
mutex_lock(&opts->lock); |
|
if (opts->refcnt > 1) { |
|
ret = -EBUSY; |
|
goto end; |
|
} |
|
|
|
c = kstrndup(page, len, GFP_KERNEL); |
|
if (!c) { |
|
ret = -ENOMEM; |
|
goto end; |
|
} |
|
if (opts->id_allocated) |
|
kfree(opts->id); |
|
opts->id = c; |
|
opts->id_allocated = true; |
|
ret = len; |
|
end: |
|
mutex_unlock(&opts->lock); |
|
return ret; |
|
} |
|
|
|
CONFIGFS_ATTR(f_midi_opts_, id); |
|
|
|
static struct configfs_attribute *midi_attrs[] = { |
|
&f_midi_opts_attr_index, |
|
&f_midi_opts_attr_buflen, |
|
&f_midi_opts_attr_qlen, |
|
&f_midi_opts_attr_in_ports, |
|
&f_midi_opts_attr_out_ports, |
|
&f_midi_opts_attr_id, |
|
NULL, |
|
}; |
|
|
|
static const struct config_item_type midi_func_type = { |
|
.ct_item_ops = &midi_item_ops, |
|
.ct_attrs = midi_attrs, |
|
.ct_owner = THIS_MODULE, |
|
}; |
|
|
|
static void f_midi_free_inst(struct usb_function_instance *f) |
|
{ |
|
struct f_midi_opts *opts; |
|
bool free = false; |
|
|
|
opts = container_of(f, struct f_midi_opts, func_inst); |
|
|
|
mutex_lock(&opts->lock); |
|
if (!--opts->refcnt) { |
|
free = true; |
|
} |
|
mutex_unlock(&opts->lock); |
|
|
|
if (free) { |
|
if (opts->id_allocated) |
|
kfree(opts->id); |
|
kfree(opts); |
|
} |
|
} |
|
|
|
static struct usb_function_instance *f_midi_alloc_inst(void) |
|
{ |
|
struct f_midi_opts *opts; |
|
|
|
opts = kzalloc(sizeof(*opts), GFP_KERNEL); |
|
if (!opts) |
|
return ERR_PTR(-ENOMEM); |
|
|
|
mutex_init(&opts->lock); |
|
opts->func_inst.free_func_inst = f_midi_free_inst; |
|
opts->index = SNDRV_DEFAULT_IDX1; |
|
opts->id = SNDRV_DEFAULT_STR1; |
|
opts->buflen = 512; |
|
opts->qlen = 32; |
|
opts->in_ports = 1; |
|
opts->out_ports = 1; |
|
opts->refcnt = 1; |
|
|
|
config_group_init_type_name(&opts->func_inst.group, "", |
|
&midi_func_type); |
|
|
|
return &opts->func_inst; |
|
} |
|
|
|
static void f_midi_free(struct usb_function *f) |
|
{ |
|
struct f_midi *midi; |
|
struct f_midi_opts *opts; |
|
bool free = false; |
|
|
|
midi = func_to_midi(f); |
|
opts = container_of(f->fi, struct f_midi_opts, func_inst); |
|
mutex_lock(&opts->lock); |
|
if (!--midi->free_ref) { |
|
kfree(midi->id); |
|
kfifo_free(&midi->in_req_fifo); |
|
kfree(midi); |
|
free = true; |
|
} |
|
mutex_unlock(&opts->lock); |
|
|
|
if (free) |
|
f_midi_free_inst(&opts->func_inst); |
|
} |
|
|
|
static void f_midi_rmidi_free(struct snd_rawmidi *rmidi) |
|
{ |
|
f_midi_free(rmidi->private_data); |
|
} |
|
|
|
static void f_midi_unbind(struct usb_configuration *c, struct usb_function *f) |
|
{ |
|
struct usb_composite_dev *cdev = f->config->cdev; |
|
struct f_midi *midi = func_to_midi(f); |
|
struct snd_card *card; |
|
|
|
DBG(cdev, "unbind\n"); |
|
|
|
/* just to be sure */ |
|
f_midi_disable(f); |
|
|
|
card = midi->card; |
|
midi->card = NULL; |
|
if (card) |
|
snd_card_free_when_closed(card); |
|
|
|
usb_free_all_descriptors(f); |
|
} |
|
|
|
static struct usb_function *f_midi_alloc(struct usb_function_instance *fi) |
|
{ |
|
struct f_midi *midi = NULL; |
|
struct f_midi_opts *opts; |
|
int status, i; |
|
|
|
opts = container_of(fi, struct f_midi_opts, func_inst); |
|
|
|
mutex_lock(&opts->lock); |
|
/* sanity check */ |
|
if (opts->in_ports > MAX_PORTS || opts->out_ports > MAX_PORTS) { |
|
status = -EINVAL; |
|
goto setup_fail; |
|
} |
|
|
|
/* allocate and initialize one new instance */ |
|
midi = kzalloc(struct_size(midi, in_ports_array, opts->in_ports), |
|
GFP_KERNEL); |
|
if (!midi) { |
|
status = -ENOMEM; |
|
goto setup_fail; |
|
} |
|
|
|
for (i = 0; i < opts->in_ports; i++) |
|
midi->in_ports_array[i].cable = i; |
|
|
|
/* set up ALSA midi devices */ |
|
midi->id = kstrdup(opts->id, GFP_KERNEL); |
|
if (opts->id && !midi->id) { |
|
status = -ENOMEM; |
|
goto midi_free; |
|
} |
|
midi->in_ports = opts->in_ports; |
|
midi->out_ports = opts->out_ports; |
|
midi->index = opts->index; |
|
midi->buflen = opts->buflen; |
|
midi->qlen = opts->qlen; |
|
midi->in_last_port = 0; |
|
midi->free_ref = 1; |
|
|
|
status = kfifo_alloc(&midi->in_req_fifo, midi->qlen, GFP_KERNEL); |
|
if (status) |
|
goto midi_free; |
|
|
|
spin_lock_init(&midi->transmit_lock); |
|
|
|
++opts->refcnt; |
|
mutex_unlock(&opts->lock); |
|
|
|
midi->func.name = "gmidi function"; |
|
midi->func.bind = f_midi_bind; |
|
midi->func.unbind = f_midi_unbind; |
|
midi->func.set_alt = f_midi_set_alt; |
|
midi->func.disable = f_midi_disable; |
|
midi->func.free_func = f_midi_free; |
|
|
|
return &midi->func; |
|
|
|
midi_free: |
|
if (midi) |
|
kfree(midi->id); |
|
kfree(midi); |
|
setup_fail: |
|
mutex_unlock(&opts->lock); |
|
|
|
return ERR_PTR(status); |
|
} |
|
|
|
DECLARE_USB_FUNCTION_INIT(midi, f_midi_alloc_inst, f_midi_alloc);
|
|
|