326 lines
8.0 KiB
C
326 lines
8.0 KiB
C
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/*
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* fireworks_transaction.c - a part of driver for Fireworks based devices
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*
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* Copyright (c) 2013-2014 Takashi Sakamoto
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*
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* Licensed under the terms of the GNU General Public License, version 2.
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*/
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/*
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* Fireworks have its own transaction. The transaction can be delivered by AV/C
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* Vendor Specific command frame or usual asynchronous transaction. At least,
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* Windows driver and firmware version 5.5 or later don't use AV/C command.
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*
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* Transaction substance:
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* At first, 6 data exist. Following to the data, parameters for each command
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* exist. All of the parameters are 32 bit aligned to big endian.
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* data[0]: Length of transaction substance
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* data[1]: Transaction version
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* data[2]: Sequence number. This is incremented by the device
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* data[3]: Transaction category
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* data[4]: Transaction command
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* data[5]: Return value in response.
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* data[6-]: Parameters
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*
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* Transaction address:
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* command: 0xecc000000000
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* response: 0xecc080000000 (default)
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*
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* I note that the address for response can be changed by command. But this
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* module uses the default address.
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*/
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#include "./fireworks.h"
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#define MEMORY_SPACE_EFW_COMMAND 0xecc000000000ULL
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#define MEMORY_SPACE_EFW_RESPONSE 0xecc080000000ULL
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#define ERROR_RETRIES 3
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#define ERROR_DELAY_MS 5
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#define EFC_TIMEOUT_MS 125
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static DEFINE_SPINLOCK(instances_lock);
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static struct snd_efw *instances[SNDRV_CARDS] = SNDRV_DEFAULT_PTR;
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static DEFINE_SPINLOCK(transaction_queues_lock);
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static LIST_HEAD(transaction_queues);
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enum transaction_queue_state {
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STATE_PENDING,
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STATE_BUS_RESET,
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STATE_COMPLETE
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};
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struct transaction_queue {
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struct list_head list;
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struct fw_unit *unit;
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void *buf;
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unsigned int size;
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u32 seqnum;
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enum transaction_queue_state state;
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wait_queue_head_t wait;
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};
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int snd_efw_transaction_cmd(struct fw_unit *unit,
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const void *cmd, unsigned int size)
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{
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return snd_fw_transaction(unit, TCODE_WRITE_BLOCK_REQUEST,
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MEMORY_SPACE_EFW_COMMAND,
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(void *)cmd, size, 0);
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}
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int snd_efw_transaction_run(struct fw_unit *unit,
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const void *cmd, unsigned int cmd_size,
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void *resp, unsigned int resp_size)
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{
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struct transaction_queue t;
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unsigned int tries;
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int ret;
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t.unit = unit;
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t.buf = resp;
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t.size = resp_size;
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t.seqnum = be32_to_cpu(((struct snd_efw_transaction *)cmd)->seqnum) + 1;
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t.state = STATE_PENDING;
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init_waitqueue_head(&t.wait);
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spin_lock_irq(&transaction_queues_lock);
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list_add_tail(&t.list, &transaction_queues);
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spin_unlock_irq(&transaction_queues_lock);
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tries = 0;
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do {
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ret = snd_efw_transaction_cmd(t.unit, (void *)cmd, cmd_size);
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if (ret < 0)
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break;
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wait_event_timeout(t.wait, t.state != STATE_PENDING,
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msecs_to_jiffies(EFC_TIMEOUT_MS));
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if (t.state == STATE_COMPLETE) {
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ret = t.size;
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break;
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} else if (t.state == STATE_BUS_RESET) {
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msleep(ERROR_DELAY_MS);
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} else if (++tries >= ERROR_RETRIES) {
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dev_err(&t.unit->device, "EFW transaction timed out\n");
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ret = -EIO;
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break;
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}
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} while (1);
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spin_lock_irq(&transaction_queues_lock);
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list_del(&t.list);
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spin_unlock_irq(&transaction_queues_lock);
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return ret;
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}
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static void
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copy_resp_to_buf(struct snd_efw *efw, void *data, size_t length, int *rcode)
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{
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size_t capacity, till_end;
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struct snd_efw_transaction *t;
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t = (struct snd_efw_transaction *)data;
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length = min_t(size_t, be32_to_cpu(t->length) * sizeof(u32), length);
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spin_lock_irq(&efw->lock);
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if (efw->push_ptr < efw->pull_ptr)
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capacity = (unsigned int)(efw->pull_ptr - efw->push_ptr);
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else
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capacity = snd_efw_resp_buf_size -
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(unsigned int)(efw->push_ptr - efw->pull_ptr);
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/* confirm enough space for this response */
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if (capacity < length) {
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*rcode = RCODE_CONFLICT_ERROR;
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goto end;
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}
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/* copy to ring buffer */
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while (length > 0) {
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till_end = snd_efw_resp_buf_size -
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(unsigned int)(efw->push_ptr - efw->resp_buf);
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till_end = min_t(unsigned int, length, till_end);
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memcpy(efw->push_ptr, data, till_end);
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efw->push_ptr += till_end;
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if (efw->push_ptr >= efw->resp_buf + snd_efw_resp_buf_size)
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efw->push_ptr -= snd_efw_resp_buf_size;
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length -= till_end;
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data += till_end;
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}
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/* for hwdep */
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wake_up(&efw->hwdep_wait);
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*rcode = RCODE_COMPLETE;
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end:
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spin_unlock_irq(&efw->lock);
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}
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static void
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handle_resp_for_user(struct fw_card *card, int generation, int source,
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void *data, size_t length, int *rcode)
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{
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struct fw_device *device;
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struct snd_efw *efw;
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unsigned int i;
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spin_lock_irq(&instances_lock);
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for (i = 0; i < SNDRV_CARDS; i++) {
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efw = instances[i];
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if (efw == NULL)
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continue;
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device = fw_parent_device(efw->unit);
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if ((device->card != card) ||
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(device->generation != generation))
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continue;
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smp_rmb(); /* node id vs. generation */
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if (device->node_id != source)
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continue;
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break;
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}
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if (i == SNDRV_CARDS)
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goto end;
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copy_resp_to_buf(efw, data, length, rcode);
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end:
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spin_unlock_irq(&instances_lock);
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}
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static void
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handle_resp_for_kernel(struct fw_card *card, int generation, int source,
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void *data, size_t length, int *rcode, u32 seqnum)
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{
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struct fw_device *device;
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struct transaction_queue *t;
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unsigned long flags;
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spin_lock_irqsave(&transaction_queues_lock, flags);
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list_for_each_entry(t, &transaction_queues, list) {
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device = fw_parent_device(t->unit);
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if ((device->card != card) ||
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(device->generation != generation))
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continue;
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smp_rmb(); /* node_id vs. generation */
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if (device->node_id != source)
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continue;
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if ((t->state == STATE_PENDING) && (t->seqnum == seqnum)) {
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t->state = STATE_COMPLETE;
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t->size = min_t(unsigned int, length, t->size);
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memcpy(t->buf, data, t->size);
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wake_up(&t->wait);
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*rcode = RCODE_COMPLETE;
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}
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}
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spin_unlock_irqrestore(&transaction_queues_lock, flags);
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}
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static void
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efw_response(struct fw_card *card, struct fw_request *request,
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int tcode, int destination, int source,
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int generation, unsigned long long offset,
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void *data, size_t length, void *callback_data)
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{
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int rcode, dummy;
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u32 seqnum;
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rcode = RCODE_TYPE_ERROR;
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if (length < sizeof(struct snd_efw_transaction)) {
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rcode = RCODE_DATA_ERROR;
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goto end;
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} else if (offset != MEMORY_SPACE_EFW_RESPONSE) {
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rcode = RCODE_ADDRESS_ERROR;
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goto end;
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}
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seqnum = be32_to_cpu(((struct snd_efw_transaction *)data)->seqnum);
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if (seqnum > SND_EFW_TRANSACTION_USER_SEQNUM_MAX + 1) {
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handle_resp_for_kernel(card, generation, source,
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data, length, &rcode, seqnum);
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if (snd_efw_resp_buf_debug)
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handle_resp_for_user(card, generation, source,
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data, length, &dummy);
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} else {
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handle_resp_for_user(card, generation, source,
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data, length, &rcode);
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}
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end:
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fw_send_response(card, request, rcode);
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}
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void snd_efw_transaction_add_instance(struct snd_efw *efw)
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{
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unsigned int i;
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spin_lock_irq(&instances_lock);
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for (i = 0; i < SNDRV_CARDS; i++) {
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if (instances[i] != NULL)
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continue;
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instances[i] = efw;
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break;
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}
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spin_unlock_irq(&instances_lock);
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}
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void snd_efw_transaction_remove_instance(struct snd_efw *efw)
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{
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unsigned int i;
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spin_lock_irq(&instances_lock);
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for (i = 0; i < SNDRV_CARDS; i++) {
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if (instances[i] != efw)
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continue;
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instances[i] = NULL;
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}
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spin_unlock_irq(&instances_lock);
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}
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void snd_efw_transaction_bus_reset(struct fw_unit *unit)
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{
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struct transaction_queue *t;
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spin_lock_irq(&transaction_queues_lock);
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list_for_each_entry(t, &transaction_queues, list) {
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if ((t->unit == unit) &&
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(t->state == STATE_PENDING)) {
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t->state = STATE_BUS_RESET;
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wake_up(&t->wait);
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}
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}
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spin_unlock_irq(&transaction_queues_lock);
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}
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static struct fw_address_handler resp_register_handler = {
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.length = SND_EFW_RESPONSE_MAXIMUM_BYTES,
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.address_callback = efw_response
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};
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int snd_efw_transaction_register(void)
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{
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static const struct fw_address_region resp_register_region = {
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.start = MEMORY_SPACE_EFW_RESPONSE,
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.end = MEMORY_SPACE_EFW_RESPONSE +
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SND_EFW_RESPONSE_MAXIMUM_BYTES
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};
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return fw_core_add_address_handler(&resp_register_handler,
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&resp_register_region);
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}
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void snd_efw_transaction_unregister(void)
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{
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WARN_ON(!list_empty(&transaction_queues));
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fw_core_remove_address_handler(&resp_register_handler);
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}
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