sound/firewire/lib.h

   1 #ifndef SOUND_FIREWIRE_LIB_H_INCLUDED
   2 #define SOUND_FIREWIRE_LIB_H_INCLUDED
   3
   4 #include <linux/firewire-constants.h>
   5 #include <linux/types.h>
   6 #include <linux/sched.h>
   7 #include <sound/rawmidi.h>
   8
   9 struct fw_unit;
  10
  11 #define FW_GENERATION_MASK      0x00ff
  12 #define FW_FIXED_GENERATION     0x0100
  13 #define FW_QUIET                0x0200
  14
  15 int snd_fw_transaction(struct fw_unit *unit, int tcode,
  16                        u64 offset, void *buffer, size_t length,
  17                        unsigned int flags);
  18
  19 /* returns true if retrying the transaction would not make sense */
  20 static inline bool rcode_is_permanent_error(int rcode)
  21 {
  22         return rcode == RCODE_TYPE_ERROR || rcode == RCODE_ADDRESS_ERROR;
  23 }
  24
  25 void snd_fw_schedule_registration(struct fw_unit *unit,
  26                                   struct delayed_work *dwork);
  27
  28 struct snd_fw_async_midi_port;
  29 typedef int (*snd_fw_async_midi_port_fill)(
  30                                 struct snd_rawmidi_substream *substream,
  31                                 u8 *buf);
  32
  33 struct snd_fw_async_midi_port {
  34         struct fw_device *parent;
  35         struct work_struct work;
  36         bool idling;
  37         ktime_t next_ktime;
  38         bool error;
  39
  40         u64 addr;
  41         struct fw_transaction transaction;
  42
  43         u8 *buf;
  44         unsigned int len;
  45
  46         struct snd_rawmidi_substream *substream;
  47         snd_fw_async_midi_port_fill fill;
  48         int consume_bytes;
  49 };
  50
  51 int snd_fw_async_midi_port_init(struct snd_fw_async_midi_port *port,
  52                 struct fw_unit *unit, u64 addr, unsigned int len,
  53                 snd_fw_async_midi_port_fill fill);
  54 void snd_fw_async_midi_port_destroy(struct snd_fw_async_midi_port *port);
  55
  56 /**
  57  * snd_fw_async_midi_port_run - run transactions for the async MIDI port
  58  * @port: the asynchronous MIDI port
  59  * @substream: the MIDI substream
  60  */
  61 static inline void
  62 snd_fw_async_midi_port_run(struct snd_fw_async_midi_port *port,
  63                            struct snd_rawmidi_substream *substream)
  64 {
  65         if (!port->error) {
  66                 port->substream = substream;
  67                 schedule_work(&port->work);
  68         }
  69 }
  70
  71 /**
  72  * snd_fw_async_midi_port_finish - finish the asynchronous MIDI port
  73  * @port: the asynchronous MIDI port
  74  */
  75 static inline void
  76 snd_fw_async_midi_port_finish(struct snd_fw_async_midi_port *port)
  77 {
  78         port->substream = NULL;
  79         port->error = false;
  80 }
  81
  82 #endif