summaryrefslogtreecommitdiffstats
path: root/sound/firewire/fireworks/fireworks_transaction.c
blob: aa56b8ac537ca71d1db675e0dbc06fdcb66bcf48 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
/*
 * 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	0xecc000000000ULL
#define MEMORY_SPACE_EFW_RESPONSE	0xecc080000000ULL

#define ERROR_RETRIES 3
#define ERROR_DELAY_MS 5
#define EFC_TIMEOUT_MS 125

static DEFINE_SPINLOCK(instances_lock);
static struct snd_efw *instances[SNDRV_CARDS] = SNDRV_DEFAULT_PTR;

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_cmd(struct fw_unit *unit,
			    const void *cmd, unsigned int size)
{
	return snd_fw_transaction(unit, TCODE_WRITE_BLOCK_REQUEST,
				  MEMORY_SPACE_EFW_COMMAND,
				  (void *)cmd, size, 0);
}

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_efw_transaction_cmd(t.unit, (void *)cmd, cmd_size);
		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
copy_resp_to_buf(struct snd_efw *efw, void *data, size_t length, int *rcode)
{
	size_t capacity, till_end;
	struct snd_efw_transaction *t;

	spin_lock_irq(&efw->lock);

	t = (struct snd_efw_transaction *)data;
	length = min_t(size_t, t->length * sizeof(t->length), length);

	if (efw->push_ptr < efw->pull_ptr)
		capacity = (unsigned int)(efw->pull_ptr - efw->push_ptr);
	else
		capacity = snd_efw_resp_buf_size -
			   (unsigned int)(efw->push_ptr - efw->pull_ptr);

	/* confirm enough space for this response */
	if (capacity < length) {
		*rcode = RCODE_CONFLICT_ERROR;
		goto end;
	}

	/* copy to ring buffer */
	while (length > 0) {
		till_end = snd_efw_resp_buf_size -
			   (unsigned int)(efw->push_ptr - efw->resp_buf);
		till_end = min_t(unsigned int, length, till_end);

		memcpy(efw->push_ptr, data, till_end);

		efw->push_ptr += till_end;
		if (efw->push_ptr >= efw->resp_buf + snd_efw_resp_buf_size)
			efw->push_ptr = efw->resp_buf;

		length -= till_end;
		data += till_end;
	}

	/* for hwdep */
	efw->resp_queues++;
	wake_up(&efw->hwdep_wait);

	*rcode = RCODE_COMPLETE;
end:
	spin_unlock_irq(&efw->lock);
}

static void
handle_resp_for_user(struct fw_card *card, int generation, int source,
		     void *data, size_t length, int *rcode)
{
	struct fw_device *device;
	struct snd_efw *efw;
	unsigned int i;

	spin_lock_irq(&instances_lock);

	for (i = 0; i < SNDRV_CARDS; i++) {
		efw = instances[i];
		if (efw == NULL)
			continue;
		device = fw_parent_device(efw->unit);
		if ((device->card != card) ||
		    (device->generation != generation))
			continue;
		smp_rmb();	/* node id vs. generation */
		if (device->node_id != source)
			continue;

		break;
	}
	if (i == SNDRV_CARDS)
		goto end;

	copy_resp_to_buf(efw, data, length, rcode);
end:
	spin_unlock_irq(&instances_lock);
}

static void
handle_resp_for_kernel(struct fw_card *card, int generation, int source,
		       void *data, size_t length, int *rcode, u32 seqnum)
{
	struct fw_device *device;
	struct transaction_queue *t;
	unsigned long flags;

	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);
}

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)
{
	int rcode, dummy;
	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);
	if (seqnum > SND_EFW_TRANSACTION_USER_SEQNUM_MAX + 1) {
		handle_resp_for_kernel(card, generation, source,
				       data, length, &rcode, seqnum);
		if (snd_efw_resp_buf_debug)
			handle_resp_for_user(card, generation, source,
					     data, length, &dummy);
	} else {
		handle_resp_for_user(card, generation, source,
				     data, length, &rcode);
	}
end:
	fw_send_response(card, request, rcode);
}

void snd_efw_transaction_add_instance(struct snd_efw *efw)
{
	unsigned int i;

	spin_lock_irq(&instances_lock);

	for (i = 0; i < SNDRV_CARDS; i++) {
		if (instances[i] != NULL)
			continue;
		instances[i] = efw;
		break;
	}

	spin_unlock_irq(&instances_lock);
}

void snd_efw_transaction_remove_instance(struct snd_efw *efw)
{
	unsigned int i;

	spin_lock_irq(&instances_lock);

	for (i = 0; i < SNDRV_CARDS; i++) {
		if (instances[i] != efw)
			continue;
		instances[i] = NULL;
	}

	spin_unlock_irq(&instances_lock);
}

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);
}