diff options
Diffstat (limited to 'sound/firewire/fireworks/fireworks_transaction.c')
| -rw-r--r-- | sound/firewire/fireworks/fireworks_transaction.c | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/sound/firewire/fireworks/fireworks_transaction.c b/sound/firewire/fireworks/fireworks_transaction.c new file mode 100644 index 000000000000..aac91d8485d5 --- /dev/null +++ b/sound/firewire/fireworks/fireworks_transaction.c @@ -0,0 +1,190 @@ +/* + * fireworks_transaction.c - a part of driver for Fireworks based devices + * + * Copyright (c) 2013-2014 Takashi Sakamoto + * + * Licensed under the terms of the GNU General Public License, version 2. + */ + +/* + * Fireworks have its own transaction. The transaction can be delivered by AV/C + * Vendor Specific command. But at least Windows driver and firmware version 5.5 + * or later don't use it. + * + * Transaction substance: + * At first, 6 data exist. Following to the 6 data, parameters for each + * commands exists. All of parameters are 32 bit alighed to big endian. + * data[0]: Length of transaction substance + * data[1]: Transaction version + * data[2]: Sequence number. This is incremented by the device + * data[3]: transaction category + * data[4]: transaction command + * data[5]: return value in response. + * data[6-]: parameters + * + * Transaction address: + * command: 0xecc000000000 + * response: 0xecc080000000 (default) + * + * I note that the address for response can be changed by command. But this + * module uses the default address. + */ +#include "./fireworks.h" + +#define MEMORY_SPACE_EFW_COMMAND 0xecc000000000 +#define MEMORY_SPACE_EFW_RESPONSE 0xecc080000000 + +#define ERROR_RETRIES 3 +#define ERROR_DELAY_MS 5 +#define EFC_TIMEOUT_MS 125 + +static DEFINE_SPINLOCK(transaction_queues_lock); +static LIST_HEAD(transaction_queues); + +enum transaction_queue_state { + STATE_PENDING, + STATE_BUS_RESET, + STATE_COMPLETE +}; + +struct transaction_queue { + struct list_head list; + struct fw_unit *unit; + void *buf; + unsigned int size; + u32 seqnum; + enum transaction_queue_state state; + wait_queue_head_t wait; +}; + +int snd_efw_transaction_run(struct fw_unit *unit, + const void *cmd, unsigned int cmd_size, + void *resp, unsigned int resp_size) +{ + struct transaction_queue t; + unsigned int tries; + int ret; + + t.unit = unit; + t.buf = resp; + t.size = resp_size; + t.seqnum = be32_to_cpu(((struct snd_efw_transaction *)cmd)->seqnum) + 1; + t.state = STATE_PENDING; + init_waitqueue_head(&t.wait); + + spin_lock_irq(&transaction_queues_lock); + list_add_tail(&t.list, &transaction_queues); + spin_unlock_irq(&transaction_queues_lock); + + tries = 0; + do { + ret = snd_fw_transaction(unit, TCODE_WRITE_BLOCK_REQUEST, + MEMORY_SPACE_EFW_COMMAND, + (void *)cmd, cmd_size, 0); + if (ret < 0) + break; + + wait_event_timeout(t.wait, t.state != STATE_PENDING, + msecs_to_jiffies(EFC_TIMEOUT_MS)); + + if (t.state == STATE_COMPLETE) { + ret = t.size; + break; + } else if (t.state == STATE_BUS_RESET) { + msleep(ERROR_DELAY_MS); + } else if (++tries >= ERROR_RETRIES) { + dev_err(&t.unit->device, "EFW transaction timed out\n"); + ret = -EIO; + break; + } + } while (1); + + spin_lock_irq(&transaction_queues_lock); + list_del(&t.list); + spin_unlock_irq(&transaction_queues_lock); + + return ret; +} + +static void +efw_response(struct fw_card *card, struct fw_request *request, + int tcode, int destination, int source, + int generation, unsigned long long offset, + void *data, size_t length, void *callback_data) +{ + struct fw_device *device; + struct transaction_queue *t; + unsigned long flags; + int rcode; + u32 seqnum; + + rcode = RCODE_TYPE_ERROR; + if (length < sizeof(struct snd_efw_transaction)) { + rcode = RCODE_DATA_ERROR; + goto end; + } else if (offset != MEMORY_SPACE_EFW_RESPONSE) { + rcode = RCODE_ADDRESS_ERROR; + goto end; + } + + seqnum = be32_to_cpu(((struct snd_efw_transaction *)data)->seqnum); + + spin_lock_irqsave(&transaction_queues_lock, flags); + list_for_each_entry(t, &transaction_queues, list) { + device = fw_parent_device(t->unit); + if ((device->card != card) || + (device->generation != generation)) + continue; + smp_rmb(); /* node_id vs. generation */ + if (device->node_id != source) + continue; + + if ((t->state == STATE_PENDING) && (t->seqnum == seqnum)) { + t->state = STATE_COMPLETE; + t->size = min_t(unsigned int, length, t->size); + memcpy(t->buf, data, t->size); + wake_up(&t->wait); + rcode = RCODE_COMPLETE; + } + } + spin_unlock_irqrestore(&transaction_queues_lock, flags); +end: + fw_send_response(card, request, rcode); +} + +void snd_efw_transaction_bus_reset(struct fw_unit *unit) +{ + struct transaction_queue *t; + + spin_lock_irq(&transaction_queues_lock); + list_for_each_entry(t, &transaction_queues, list) { + if ((t->unit == unit) && + (t->state == STATE_PENDING)) { + t->state = STATE_BUS_RESET; + wake_up(&t->wait); + } + } + spin_unlock_irq(&transaction_queues_lock); +} + +static struct fw_address_handler resp_register_handler = { + .length = SND_EFW_RESPONSE_MAXIMUM_BYTES, + .address_callback = efw_response +}; + +int snd_efw_transaction_register(void) +{ + static const struct fw_address_region resp_register_region = { + .start = MEMORY_SPACE_EFW_RESPONSE, + .end = MEMORY_SPACE_EFW_RESPONSE + + SND_EFW_RESPONSE_MAXIMUM_BYTES + }; + return fw_core_add_address_handler(&resp_register_handler, + &resp_register_region); +} + +void snd_efw_transaction_unregister(void) +{ + WARN_ON(!list_empty(&transaction_queues)); + fw_core_remove_address_handler(&resp_register_handler); +} |