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 struct snd_fw_async_midi_port;
  26 typedef int (*snd_fw_async_midi_port_fill)(
  27                                 struct snd_rawmidi_substream *substream,
  28                                 u8 *buf);
  29
  30 struct snd_fw_async_midi_port {
  31         struct fw_device *parent;
  32         struct work_struct work;
  33         bool idling;
  34         ktime_t next_ktime;
  35         bool error;
  36
  37         u64 addr;
  38         struct fw_transaction transaction;
  39
  40         u8 *buf;
  41         unsigned int len;
  42
  43         struct snd_rawmidi_substream *substream;
  44         snd_fw_async_midi_port_fill fill;
  45         int consume_bytes;
  46 };
  47
  48 int snd_fw_async_midi_port_init(struct snd_fw_async_midi_port *port,
  49                 struct fw_unit *unit, u64 addr, unsigned int len,
  50                 snd_fw_async_midi_port_fill fill);
  51 void snd_fw_async_midi_port_destroy(struct snd_fw_async_midi_port *port);
  52
  53 /**
  54  * snd_fw_async_midi_port_run - run transactions for the async MIDI port
  55  * @port: the asynchronous MIDI port
  56  * @substream: the MIDI substream
  57  */
  58 static inline void
  59 snd_fw_async_midi_port_run(struct snd_fw_async_midi_port *port,
  60                            struct snd_rawmidi_substream *substream)
  61 {
  62         if (!port->error) {
  63                 port->substream = substream;
  64                 schedule_work(&port->work);
  65         }
  66 }
  67
  68 /**
  69  * snd_fw_async_midi_port_finish - finish the asynchronous MIDI port
  70  * @port: the asynchronous MIDI port
  71  */
  72 static inline void
  73 snd_fw_async_midi_port_finish(struct snd_fw_async_midi_port *port)
  74 {
  75         port->substream = NULL;
  76         port->error = false;
  77 }
  78
  79 #endif