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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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e3315b439c
When physical controls on SCS.1 models are operated, the models transfer MIDI messages in asynchronous transactions on IEEE 1394 bus. The models have a register to have an address for the transactions, and drivers can register own address for this purpose. This commit keeps a region of address, registers it and adds a handler for the transactions. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
90 lines
2.3 KiB
C
90 lines
2.3 KiB
C
/*
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* oxfw-scs1x.c - a part of driver for OXFW970/971 based devices
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*
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* Copyright (c) Clemens Ladisch <clemens@ladisch.de>
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* Copyright (c) 2015 Takashi Sakamoto <o-takashi@sakamocchi.jp>
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*
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* Licensed under the terms of the GNU General Public License, version 2.
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*/
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#include "oxfw.h"
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#define HSS1394_ADDRESS 0xc007dedadadaULL
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#define HSS1394_MAX_PACKET_SIZE 64
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#define HSS1394_TAG_CHANGE_ADDRESS 0xf1
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struct fw_scs1x {
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struct fw_address_handler hss_handler;
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};
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static void handle_hss(struct fw_card *card, struct fw_request *request,
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int tcode, int destination, int source, int generation,
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unsigned long long offset, void *data, size_t length,
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void *callback_data)
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{
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fw_send_response(card, request, RCODE_COMPLETE);
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}
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static int register_address(struct snd_oxfw *oxfw)
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{
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struct fw_scs1x *scs = oxfw->spec;
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__be64 data;
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data = cpu_to_be64(((u64)HSS1394_TAG_CHANGE_ADDRESS << 56) |
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scs->hss_handler.offset);
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return snd_fw_transaction(oxfw->unit, TCODE_WRITE_BLOCK_REQUEST,
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HSS1394_ADDRESS, &data, sizeof(data), 0);
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}
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static void remove_scs1x(struct snd_rawmidi *rmidi)
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{
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struct fw_scs1x *scs = rmidi->private_data;
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fw_core_remove_address_handler(&scs->hss_handler);
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}
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void snd_oxfw_scs1x_update(struct snd_oxfw *oxfw)
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{
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register_address(oxfw);
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}
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int snd_oxfw_scs1x_add(struct snd_oxfw *oxfw)
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{
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struct snd_rawmidi *rmidi;
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struct fw_scs1x *scs;
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int err;
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scs = kzalloc(sizeof(struct fw_scs1x), GFP_KERNEL);
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if (scs == NULL)
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return -ENOMEM;
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oxfw->spec = scs;
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/* Allocate own handler for imcoming asynchronous transaction. */
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scs->hss_handler.length = HSS1394_MAX_PACKET_SIZE;
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scs->hss_handler.address_callback = handle_hss;
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scs->hss_handler.callback_data = scs;
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err = fw_core_add_address_handler(&scs->hss_handler,
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&fw_high_memory_region);
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if (err < 0)
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return err;
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err = register_address(oxfw);
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if (err < 0)
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goto err_allocated;
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/* Use unique name for backward compatibility to scs1x module. */
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err = snd_rawmidi_new(oxfw->card, "SCS.1x", 0, 0, 0, &rmidi);
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if (err < 0)
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goto err_allocated;
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rmidi->private_data = scs;
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rmidi->private_free = remove_scs1x;
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snprintf(rmidi->name, sizeof(rmidi->name),
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"%s MIDI", oxfw->card->shortname);
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return 0;
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err_allocated:
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fw_core_remove_address_handler(&scs->hss_handler);
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return err;
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}
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