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8#include <linux/delay.h>
9#include <linux/device.h>
10#include <linux/firewire.h>
11#include <linux/module.h>
12#include <linux/slab.h>
13#include "lib.h"
14
15#define ERROR_RETRY_DELAY_MS 20
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33int snd_fw_transaction(struct fw_unit *unit, int tcode,
34 u64 offset, void *buffer, size_t length,
35 unsigned int flags)
36{
37 struct fw_device *device = fw_parent_device(unit);
38 int generation, rcode, tries = 0;
39
40 generation = flags & FW_GENERATION_MASK;
41 for (;;) {
42 if (!(flags & FW_FIXED_GENERATION)) {
43 generation = device->generation;
44 smp_rmb();
45 }
46 rcode = fw_run_transaction(device->card, tcode,
47 device->node_id, generation,
48 device->max_speed, offset,
49 buffer, length);
50
51 if (rcode == RCODE_COMPLETE)
52 return 0;
53
54 if (rcode == RCODE_GENERATION && (flags & FW_FIXED_GENERATION))
55 return -EAGAIN;
56
57 if (rcode_is_permanent_error(rcode) || ++tries >= 3) {
58 if (!(flags & FW_QUIET))
59 dev_err(&unit->device,
60 "transaction failed: %s\n",
61 fw_rcode_string(rcode));
62 return -EIO;
63 }
64
65 msleep(ERROR_RETRY_DELAY_MS);
66 }
67}
68EXPORT_SYMBOL(snd_fw_transaction);
69
70#define PROBE_DELAY_MS (2 * MSEC_PER_SEC)
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84void snd_fw_schedule_registration(struct fw_unit *unit,
85 struct delayed_work *dwork)
86{
87 u64 now, delay;
88
89 now = get_jiffies_64();
90 delay = fw_parent_device(unit)->card->reset_jiffies
91 + msecs_to_jiffies(PROBE_DELAY_MS);
92
93 if (time_after64(delay, now))
94 delay -= now;
95 else
96 delay = 0;
97
98 mod_delayed_work(system_wq, dwork, delay);
99}
100EXPORT_SYMBOL(snd_fw_schedule_registration);
101
102MODULE_DESCRIPTION("FireWire audio helper functions");
103MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
104MODULE_LICENSE("GPL v2");
105