mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-17 01:04:19 +08:00
31ef9134eb
Add a driver for two playback-only FireWire devices based on the OXFW970
chip.
v2: better AMDTP API abstraction; fix fw_unit leak; small fixes
v3: cache the iPCR value
v4: FireWave constraints; fix fw_device reference counting;
fix PCR caching; small changes and fixes
v5: volume/mute support; fix crashing due to pcm stop races
v6: fix build; one-channel volume for LaCie
v7: use signed values to make volume (range checks) work; fix function
block IDs for volume/mute; always use channel 0 for LaCie volume
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Acked-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Tested-by: Jay Fenlason <fenlason@redhat.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
86 lines
2.3 KiB
C
86 lines
2.3 KiB
C
/*
|
|
* miscellaneous helper functions
|
|
*
|
|
* Copyright (c) Clemens Ladisch <clemens@ladisch.de>
|
|
* Licensed under the terms of the GNU General Public License, version 2.
|
|
*/
|
|
|
|
#include <linux/delay.h>
|
|
#include <linux/device.h>
|
|
#include <linux/firewire.h>
|
|
#include <linux/module.h>
|
|
#include "lib.h"
|
|
|
|
#define ERROR_RETRY_DELAY_MS 5
|
|
|
|
/**
|
|
* rcode_string - convert a firewire result code to a string
|
|
* @rcode: the result
|
|
*/
|
|
const char *rcode_string(unsigned int rcode)
|
|
{
|
|
static const char *const names[] = {
|
|
[RCODE_COMPLETE] = "complete",
|
|
[RCODE_CONFLICT_ERROR] = "conflict error",
|
|
[RCODE_DATA_ERROR] = "data error",
|
|
[RCODE_TYPE_ERROR] = "type error",
|
|
[RCODE_ADDRESS_ERROR] = "address error",
|
|
[RCODE_SEND_ERROR] = "send error",
|
|
[RCODE_CANCELLED] = "cancelled",
|
|
[RCODE_BUSY] = "busy",
|
|
[RCODE_GENERATION] = "generation",
|
|
[RCODE_NO_ACK] = "no ack",
|
|
};
|
|
|
|
if (rcode < ARRAY_SIZE(names) && names[rcode])
|
|
return names[rcode];
|
|
else
|
|
return "unknown";
|
|
}
|
|
EXPORT_SYMBOL(rcode_string);
|
|
|
|
/**
|
|
* snd_fw_transaction - send a request and wait for its completion
|
|
* @unit: the driver's unit on the target device
|
|
* @tcode: the transaction code
|
|
* @offset: the address in the target's address space
|
|
* @buffer: input/output data
|
|
* @length: length of @buffer
|
|
*
|
|
* Submits an asynchronous request to the target device, and waits for the
|
|
* response. The node ID and the current generation are derived from @unit.
|
|
* On a bus reset or an error, the transaction is retried a few times.
|
|
* Returns zero on success, or a negative error code.
|
|
*/
|
|
int snd_fw_transaction(struct fw_unit *unit, int tcode,
|
|
u64 offset, void *buffer, size_t length)
|
|
{
|
|
struct fw_device *device = fw_parent_device(unit);
|
|
int generation, rcode, tries = 0;
|
|
|
|
for (;;) {
|
|
generation = device->generation;
|
|
smp_rmb(); /* node_id vs. generation */
|
|
rcode = fw_run_transaction(device->card, tcode,
|
|
device->node_id, generation,
|
|
device->max_speed, offset,
|
|
buffer, length);
|
|
|
|
if (rcode == RCODE_COMPLETE)
|
|
return 0;
|
|
|
|
if (rcode_is_permanent_error(rcode) || ++tries >= 3) {
|
|
dev_err(&unit->device, "transaction failed: %s\n",
|
|
rcode_string(rcode));
|
|
return -EIO;
|
|
}
|
|
|
|
msleep(ERROR_RETRY_DELAY_MS);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(snd_fw_transaction);
|
|
|
|
MODULE_DESCRIPTION("FireWire audio helper functions");
|
|
MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
|
|
MODULE_LICENSE("GPL v2");
|