+++ /dev/null
-/*
- * Stanton Control System 1 MIDI driver
- *
- * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
- * Licensed under the terms of the GNU General Public License, version 2.
- */
-
-#include <linux/device.h>
-#include <linux/firewire.h>
-#include <linux/firewire-constants.h>
-#include <linux/interrupt.h>
-#include <linux/module.h>
-#include <linux/mod_devicetable.h>
-#include <linux/slab.h>
-#include <linux/string.h>
-#include <linux/wait.h>
-#include <sound/core.h>
-#include <sound/initval.h>
-#include <sound/rawmidi.h>
-#include "lib.h"
-
-#define OUI_STANTON 0x001260
-#define MODEL_SCS_1M 0x001000
-#define MODEL_SCS_1D 0x002000
-
-#define HSS1394_ADDRESS 0xc007dedadadaULL
-#define HSS1394_MAX_PACKET_SIZE 64
-
-#define HSS1394_TAG_USER_DATA 0x00
-#define HSS1394_TAG_CHANGE_ADDRESS 0xf1
-
-struct scs {
- struct snd_card *card;
- struct fw_unit *unit;
- struct fw_address_handler hss_handler;
- struct fw_transaction transaction;
- bool transaction_running;
- bool output_idle;
- u8 output_status;
- u8 output_bytes;
- bool output_escaped;
- bool output_escape_high_nibble;
- u8 input_escape_count;
- struct snd_rawmidi_substream *output;
- struct snd_rawmidi_substream *input;
- struct tasklet_struct tasklet;
- wait_queue_head_t idle_wait;
- u8 *buffer;
-};
-
-static const u8 sysex_escape_prefix[] = {
- 0xf0, /* SysEx begin */
- 0x00, 0x01, 0x60, /* Stanton DJ */
- 0x48, 0x53, 0x53, /* "HSS" */
-};
-
-static int scs_output_open(struct snd_rawmidi_substream *stream)
-{
- struct scs *scs = stream->rmidi->private_data;
-
- scs->output_status = 0;
- scs->output_bytes = 1;
- scs->output_escaped = false;
-
- return 0;
-}
-
-static int scs_output_close(struct snd_rawmidi_substream *stream)
-{
- return 0;
-}
-
-static void scs_output_trigger(struct snd_rawmidi_substream *stream, int up)
-{
- struct scs *scs = stream->rmidi->private_data;
-
- ACCESS_ONCE(scs->output) = up ? stream : NULL;
- if (up) {
- scs->output_idle = false;
- tasklet_schedule(&scs->tasklet);
- }
-}
-
-static void scs_write_callback(struct fw_card *card, int rcode,
- void *data, size_t length, void *callback_data)
-{
- struct scs *scs = callback_data;
-
- if (rcode == RCODE_GENERATION) {
- /* TODO: retry this packet */
- }
-
- scs->transaction_running = false;
- tasklet_schedule(&scs->tasklet);
-}
-
-static bool is_valid_running_status(u8 status)
-{
- return status >= 0x80 && status <= 0xef;
-}
-
-static bool is_one_byte_cmd(u8 status)
-{
- return status == 0xf6 ||
- status >= 0xf8;
-}
-
-static bool is_two_bytes_cmd(u8 status)
-{
- return (status >= 0xc0 && status <= 0xdf) ||
- status == 0xf1 ||
- status == 0xf3;
-}
-
-static bool is_three_bytes_cmd(u8 status)
-{
- return (status >= 0x80 && status <= 0xbf) ||
- (status >= 0xe0 && status <= 0xef) ||
- status == 0xf2;
-}
-
-static bool is_invalid_cmd(u8 status)
-{
- return status == 0xf4 ||
- status == 0xf5 ||
- status == 0xf9 ||
- status == 0xfd;
-}
-
-static void scs_output_tasklet(unsigned long data)
-{
- struct scs *scs = (void *)data;
- struct snd_rawmidi_substream *stream;
- unsigned int i;
- u8 byte;
- struct fw_device *dev;
- int generation;
-
- if (scs->transaction_running)
- return;
-
- stream = ACCESS_ONCE(scs->output);
- if (!stream) {
- scs->output_idle = true;
- wake_up(&scs->idle_wait);
- return;
- }
-
- i = scs->output_bytes;
- for (;;) {
- if (snd_rawmidi_transmit(stream, &byte, 1) != 1) {
- scs->output_bytes = i;
- scs->output_idle = true;
- wake_up(&scs->idle_wait);
- return;
- }
- /*
- * Convert from real MIDI to what I think the device expects (no
- * running status, one command per packet, unescaped SysExs).
- */
- if (scs->output_escaped && byte < 0x80) {
- if (scs->output_escape_high_nibble) {
- if (i < HSS1394_MAX_PACKET_SIZE) {
- scs->buffer[i] = byte << 4;
- scs->output_escape_high_nibble = false;
- }
- } else {
- scs->buffer[i++] |= byte & 0x0f;
- scs->output_escape_high_nibble = true;
- }
- } else if (byte < 0x80) {
- if (i == 1) {
- if (!is_valid_running_status(scs->output_status))
- continue;
- scs->buffer[0] = HSS1394_TAG_USER_DATA;
- scs->buffer[i++] = scs->output_status;
- }
- scs->buffer[i++] = byte;
- if ((i == 3 && is_two_bytes_cmd(scs->output_status)) ||
- (i == 4 && is_three_bytes_cmd(scs->output_status)))
- break;
- if (i == 1 + ARRAY_SIZE(sysex_escape_prefix) &&
- !memcmp(scs->buffer + 1, sysex_escape_prefix,
- ARRAY_SIZE(sysex_escape_prefix))) {
- scs->output_escaped = true;
- scs->output_escape_high_nibble = true;
- i = 0;
- }
- if (i >= HSS1394_MAX_PACKET_SIZE)
- i = 1;
- } else if (byte == 0xf7) {
- if (scs->output_escaped) {
- if (i >= 1 && scs->output_escape_high_nibble &&
- scs->buffer[0] != HSS1394_TAG_CHANGE_ADDRESS)
- break;
- } else {
- if (i > 1 && scs->output_status == 0xf0) {
- scs->buffer[i++] = 0xf7;
- break;
- }
- }
- i = 1;
- scs->output_escaped = false;
- } else if (!is_invalid_cmd(byte) &&
- byte < 0xf8) {
- i = 1;
- scs->buffer[0] = HSS1394_TAG_USER_DATA;
- scs->buffer[i++] = byte;
- scs->output_status = byte;
- scs->output_escaped = false;
- if (is_one_byte_cmd(byte))
- break;
- }
- }
- scs->output_bytes = 1;
- scs->output_escaped = false;
-
- scs->transaction_running = true;
- dev = fw_parent_device(scs->unit);
- generation = dev->generation;
- smp_rmb(); /* node_id vs. generation */
- fw_send_request(dev->card, &scs->transaction, TCODE_WRITE_BLOCK_REQUEST,
- dev->node_id, generation, dev->max_speed,
- HSS1394_ADDRESS, scs->buffer, i,
- scs_write_callback, scs);
-}
-
-static void scs_output_drain(struct snd_rawmidi_substream *stream)
-{
- struct scs *scs = stream->rmidi->private_data;
-
- wait_event(scs->idle_wait, scs->output_idle);
-}
-
-static struct snd_rawmidi_ops output_ops = {
- .open = scs_output_open,
- .close = scs_output_close,
- .trigger = scs_output_trigger,
- .drain = scs_output_drain,
-};
-
-static int scs_input_open(struct snd_rawmidi_substream *stream)
-{
- struct scs *scs = stream->rmidi->private_data;
-
- scs->input_escape_count = 0;
-
- return 0;
-}
-
-static int scs_input_close(struct snd_rawmidi_substream *stream)
-{
- return 0;
-}
-
-static void scs_input_trigger(struct snd_rawmidi_substream *stream, int up)
-{
- struct scs *scs = stream->rmidi->private_data;
-
- ACCESS_ONCE(scs->input) = up ? stream : NULL;
-}
-
-static void scs_input_escaped_byte(struct snd_rawmidi_substream *stream,
- u8 byte)
-{
- u8 nibbles[2];
-
- nibbles[0] = byte >> 4;
- nibbles[1] = byte & 0x0f;
- snd_rawmidi_receive(stream, nibbles, 2);
-}
-
-static void scs_input_midi_byte(struct scs *scs,
- struct snd_rawmidi_substream *stream,
- u8 byte)
-{
- if (scs->input_escape_count > 0) {
- scs_input_escaped_byte(stream, byte);
- scs->input_escape_count--;
- if (scs->input_escape_count == 0)
- snd_rawmidi_receive(stream, (const u8[]) { 0xf7 }, 1);
- } else if (byte == 0xf9) {
- snd_rawmidi_receive(stream, sysex_escape_prefix,
- ARRAY_SIZE(sysex_escape_prefix));
- scs_input_escaped_byte(stream, 0x00);
- scs_input_escaped_byte(stream, 0xf9);
- scs->input_escape_count = 3;
- } else {
- snd_rawmidi_receive(stream, &byte, 1);
- }
-}
-
-static void scs_input_packet(struct scs *scs,
- struct snd_rawmidi_substream *stream,
- const u8 *data, unsigned int bytes)
-{
- unsigned int i;
-
- if (data[0] == HSS1394_TAG_USER_DATA) {
- for (i = 1; i < bytes; ++i)
- scs_input_midi_byte(scs, stream, data[i]);
- } else {
- snd_rawmidi_receive(stream, sysex_escape_prefix,
- ARRAY_SIZE(sysex_escape_prefix));
- for (i = 0; i < bytes; ++i)
- scs_input_escaped_byte(stream, data[i]);
- snd_rawmidi_receive(stream, (const u8[]) { 0xf7 }, 1);
- }
-}
-
-static struct snd_rawmidi_ops input_ops = {
- .open = scs_input_open,
- .close = scs_input_close,
- .trigger = scs_input_trigger,
-};
-
-static int scs_create_midi(struct scs *scs)
-{
- struct snd_rawmidi *rmidi;
- int err;
-
- err = snd_rawmidi_new(scs->card, "SCS.1x", 0, 1, 1, &rmidi);
- if (err < 0)
- return err;
- snprintf(rmidi->name, sizeof(rmidi->name),
- "%s MIDI", scs->card->shortname);
- rmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT |
- SNDRV_RAWMIDI_INFO_INPUT |
- SNDRV_RAWMIDI_INFO_DUPLEX;
- rmidi->private_data = scs;
- snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &output_ops);
- snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &input_ops);
-
- return 0;
-}
-
-static void handle_hss(struct fw_card *card, struct fw_request *request,
- int tcode, int destination, int source, int generation,
- unsigned long long offset, void *data, size_t length,
- void *callback_data)
-{
- struct scs *scs = callback_data;
- struct snd_rawmidi_substream *stream;
-
- if (offset != scs->hss_handler.offset) {
- fw_send_response(card, request, RCODE_ADDRESS_ERROR);
- return;
- }
- if (tcode != TCODE_WRITE_QUADLET_REQUEST &&
- tcode != TCODE_WRITE_BLOCK_REQUEST) {
- fw_send_response(card, request, RCODE_TYPE_ERROR);
- return;
- }
-
- if (length >= 1) {
- stream = ACCESS_ONCE(scs->input);
- if (stream)
- scs_input_packet(scs, stream, data, length);
- }
-
- fw_send_response(card, request, RCODE_COMPLETE);
-}
-
-static int scs_init_hss_address(struct scs *scs)
-{
- __be64 data;
- int err;
-
- data = cpu_to_be64(((u64)HSS1394_TAG_CHANGE_ADDRESS << 56) |
- scs->hss_handler.offset);
- err = snd_fw_transaction(scs->unit, TCODE_WRITE_BLOCK_REQUEST,
- HSS1394_ADDRESS, &data, 8, 0);
- if (err < 0)
- dev_err(&scs->unit->device, "HSS1394 communication failed\n");
-
- return err;
-}
-
-static void scs_card_free(struct snd_card *card)
-{
- struct scs *scs = card->private_data;
-
- fw_core_remove_address_handler(&scs->hss_handler);
- kfree(scs->buffer);
-}
-
-static int scs_probe(struct fw_unit *unit, const struct ieee1394_device_id *id)
-{
- struct fw_device *fw_dev = fw_parent_device(unit);
- struct snd_card *card;
- struct scs *scs;
- int err;
-
- err = snd_card_new(&unit->device, -16, NULL, THIS_MODULE,
- sizeof(*scs), &card);
- if (err < 0)
- return err;
-
- scs = card->private_data;
- scs->card = card;
- scs->unit = unit;
- tasklet_init(&scs->tasklet, scs_output_tasklet, (unsigned long)scs);
- init_waitqueue_head(&scs->idle_wait);
- scs->output_idle = true;
-
- scs->buffer = kmalloc(HSS1394_MAX_PACKET_SIZE, GFP_KERNEL);
- if (!scs->buffer) {
- err = -ENOMEM;
- goto err_card;
- }
-
- scs->hss_handler.length = HSS1394_MAX_PACKET_SIZE;
- scs->hss_handler.address_callback = handle_hss;
- scs->hss_handler.callback_data = scs;
- err = fw_core_add_address_handler(&scs->hss_handler,
- &fw_high_memory_region);
- if (err < 0)
- goto err_buffer;
-
- card->private_free = scs_card_free;
-
- strcpy(card->driver, "SCS.1x");
- strcpy(card->shortname, "SCS.1x");
- fw_csr_string(unit->directory, CSR_MODEL,
- card->shortname, sizeof(card->shortname));
- snprintf(card->longname, sizeof(card->longname),
- "Stanton DJ %s (GUID %08x%08x) at %s, S%d",
- card->shortname, fw_dev->config_rom[3], fw_dev->config_rom[4],
- dev_name(&unit->device), 100 << fw_dev->max_speed);
- strcpy(card->mixername, card->shortname);
-
- err = scs_init_hss_address(scs);
- if (err < 0)
- goto err_card;
-
- err = scs_create_midi(scs);
- if (err < 0)
- goto err_card;
-
- err = snd_card_register(card);
- if (err < 0)
- goto err_card;
-
- dev_set_drvdata(&unit->device, scs);
-
- return 0;
-
-err_buffer:
- kfree(scs->buffer);
-err_card:
- snd_card_free(card);
- return err;
-}
-
-static void scs_update(struct fw_unit *unit)
-{
- struct scs *scs = dev_get_drvdata(&unit->device);
- int generation;
- __be64 data;
-
- data = cpu_to_be64(((u64)HSS1394_TAG_CHANGE_ADDRESS << 56) |
- scs->hss_handler.offset);
- generation = fw_parent_device(unit)->generation;
- smp_rmb(); /* node_id vs. generation */
- snd_fw_transaction(scs->unit, TCODE_WRITE_BLOCK_REQUEST,
- HSS1394_ADDRESS, &data, 8,
- FW_FIXED_GENERATION | generation);
-}
-
-static void scs_remove(struct fw_unit *unit)
-{
- struct scs *scs = dev_get_drvdata(&unit->device);
-
- snd_card_disconnect(scs->card);
-
- ACCESS_ONCE(scs->output) = NULL;
- ACCESS_ONCE(scs->input) = NULL;
-
- wait_event(scs->idle_wait, scs->output_idle);
-
- tasklet_kill(&scs->tasklet);
-
- snd_card_free_when_closed(scs->card);
-}
-
-static const struct ieee1394_device_id scs_id_table[] = {
- {
- .match_flags = IEEE1394_MATCH_VENDOR_ID |
- IEEE1394_MATCH_MODEL_ID,
- .vendor_id = OUI_STANTON,
- .model_id = MODEL_SCS_1M,
- },
- {
- .match_flags = IEEE1394_MATCH_VENDOR_ID |
- IEEE1394_MATCH_MODEL_ID,
- .vendor_id = OUI_STANTON,
- .model_id = MODEL_SCS_1D,
- },
- {}
-};
-MODULE_DEVICE_TABLE(ieee1394, scs_id_table);
-
-MODULE_DESCRIPTION("SCS.1x MIDI driver");
-MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
-MODULE_LICENSE("GPL v2");
-
-static struct fw_driver scs_driver = {
- .driver = {
- .owner = THIS_MODULE,
- .name = KBUILD_MODNAME,
- .bus = &fw_bus_type,
- },
- .probe = scs_probe,
- .update = scs_update,
- .remove = scs_remove,
- .id_table = scs_id_table,
-};
-
-static int __init alsa_scs1x_init(void)
-{
- return driver_register(&scs_driver.driver);
-}
-
-static void __exit alsa_scs1x_exit(void)
-{
- driver_unregister(&scs_driver.driver);
-}
-
-module_init(alsa_scs1x_init);
-module_exit(alsa_scs1x_exit);
projects / GitHub / MotorolaMobilityLLC / kernel-slsi.git / commitdiff