923f92ebb4
In former commit, ALSA dice driver postpone sound card registration after IEEE 1394 bus is calm. This idea has advantages for the other drivers. This commit adds a helper function for it to firewire-lib module. The function is really for the specific purpose. Callers should initialize delayed work structure with callback function. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
82 lines
2 KiB
C
82 lines
2 KiB
C
#ifndef SOUND_FIREWIRE_LIB_H_INCLUDED
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#define SOUND_FIREWIRE_LIB_H_INCLUDED
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#include <linux/firewire-constants.h>
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#include <linux/types.h>
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#include <linux/sched.h>
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#include <sound/rawmidi.h>
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struct fw_unit;
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#define FW_GENERATION_MASK 0x00ff
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#define FW_FIXED_GENERATION 0x0100
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#define FW_QUIET 0x0200
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int snd_fw_transaction(struct fw_unit *unit, int tcode,
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u64 offset, void *buffer, size_t length,
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unsigned int flags);
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/* returns true if retrying the transaction would not make sense */
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static inline bool rcode_is_permanent_error(int rcode)
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{
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return rcode == RCODE_TYPE_ERROR || rcode == RCODE_ADDRESS_ERROR;
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}
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void snd_fw_schedule_registration(struct fw_unit *unit,
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struct delayed_work *dwork);
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struct snd_fw_async_midi_port;
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typedef int (*snd_fw_async_midi_port_fill)(
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struct snd_rawmidi_substream *substream,
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u8 *buf);
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struct snd_fw_async_midi_port {
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struct fw_device *parent;
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struct work_struct work;
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bool idling;
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ktime_t next_ktime;
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bool error;
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u64 addr;
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struct fw_transaction transaction;
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u8 *buf;
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unsigned int len;
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struct snd_rawmidi_substream *substream;
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snd_fw_async_midi_port_fill fill;
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unsigned int consume_bytes;
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};
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int snd_fw_async_midi_port_init(struct snd_fw_async_midi_port *port,
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struct fw_unit *unit, u64 addr, unsigned int len,
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snd_fw_async_midi_port_fill fill);
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void snd_fw_async_midi_port_destroy(struct snd_fw_async_midi_port *port);
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/**
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* snd_fw_async_midi_port_run - run transactions for the async MIDI port
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* @port: the asynchronous MIDI port
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* @substream: the MIDI substream
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*/
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static inline void
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snd_fw_async_midi_port_run(struct snd_fw_async_midi_port *port,
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struct snd_rawmidi_substream *substream)
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{
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if (!port->error) {
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port->substream = substream;
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schedule_work(&port->work);
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}
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}
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/**
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* snd_fw_async_midi_port_finish - finish the asynchronous MIDI port
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* @port: the asynchronous MIDI port
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*/
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static inline void
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snd_fw_async_midi_port_finish(struct snd_fw_async_midi_port *port)
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{
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port->substream = NULL;
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port->error = false;
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}
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#endif
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