summaryrefslogtreecommitdiffstats
path: root/sound/usb/6fire/comm.c
blob: c994daa57af2424a6f8fd8bef1f387ab19b017ac (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
/*
 * Linux driver for TerraTec DMX 6Fire USB
 *
 * Device communications
 *
 * Author:	Torsten Schenk <torsten.schenk@zoho.com>
 * Created:	Jan 01, 2011
 * Version:	0.3.0
 * Copyright:	(C) Torsten Schenk
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include "comm.h"
#include "chip.h"
#include "midi.h"

enum {
	COMM_EP = 1,
	COMM_FPGA_EP = 2
};

static void usb6fire_comm_init_urb(struct comm_runtime *rt, struct urb *urb,
		u8 *buffer, void *context, void(*handler)(struct urb *urb))
{
	usb_init_urb(urb);
	urb->transfer_buffer = buffer;
	urb->pipe = usb_sndintpipe(rt->chip->dev, COMM_EP);
	urb->complete = handler;
	urb->context = context;
	urb->interval = 1;
	urb->dev = rt->chip->dev;
}

static void usb6fire_comm_receiver_handler(struct urb *urb)
{
	struct comm_runtime *rt = urb->context;
	struct midi_runtime *midi_rt = rt->chip->midi;

	if (!urb->status) {
		if (rt->receiver_buffer[0] == 0x10) /* midi in event */
			if (midi_rt)
				midi_rt->in_received(midi_rt,
						rt->receiver_buffer + 2,
						rt->receiver_buffer[1]);
	}

	if (!rt->chip->shutdown) {
		urb->status = 0;
		urb->actual_length = 0;
		if (usb_submit_urb(urb, GFP_ATOMIC) < 0)
			snd_printk(KERN_WARNING PREFIX
					"comm data receiver aborted.\n");
	}
}

static void usb6fire_comm_init_buffer(u8 *buffer, u8 id, u8 request,
		u8 reg, u8 vl, u8 vh)
{
	buffer[0] = 0x01;
	buffer[2] = request;
	buffer[3] = id;
	switch (request) {
	case 0x02:
		buffer[1] = 0x05; /* length (starting at buffer[2]) */
		buffer[4] = reg;
		buffer[5] = vl;
		buffer[6] = vh;
		break;

	case 0x12:
		buffer[1] = 0x0b; /* length (starting at buffer[2]) */
		buffer[4] = 0x00;
		buffer[5] = 0x18;
		buffer[6] = 0x05;
		buffer[7] = 0x00;
		buffer[8] = 0x01;
		buffer[9] = 0x00;
		buffer[10] = 0x9e;
		buffer[11] = reg;
		buffer[12] = vl;
		break;

	case 0x20:
	case 0x21:
	case 0x22:
		buffer[1] = 0x04;
		buffer[4] = reg;
		buffer[5] = vl;
		break;
	}
}

static int usb6fire_comm_send_buffer(u8 *buffer, struct usb_device *dev)
{
	int ret;
	int actual_len;

	ret = usb_interrupt_msg(dev, usb_sndintpipe(dev, COMM_EP),
			buffer, buffer[1] + 2, &actual_len, HZ);
	if (ret < 0)
		return ret;
	else if (actual_len != buffer[1] + 2)
		return -EIO;
	return 0;
}

static int usb6fire_comm_write8(struct comm_runtime *rt, u8 request,
		u8 reg, u8 value)
{
	u8 buffer[13]; /* 13: maximum length of message */

	usb6fire_comm_init_buffer(buffer, 0x00, request, reg, value, 0x00);
	return usb6fire_comm_send_buffer(buffer, rt->chip->dev);
}

static int usb6fire_comm_write16(struct comm_runtime *rt, u8 request,
		u8 reg, u8 vl, u8 vh)
{
	u8 buffer[13]; /* 13: maximum length of message */

	usb6fire_comm_init_buffer(buffer, 0x00, request, reg, vl, vh);
	return usb6fire_comm_send_buffer(buffer, rt->chip->dev);
}

int __devinit usb6fire_comm_init(struct sfire_chip *chip)
{
	struct comm_runtime *rt = kzalloc(sizeof(struct comm_runtime),
			GFP_KERNEL);
	struct urb *urb = &rt->receiver;
	int ret;

	if (!rt)
		return -ENOMEM;

	rt->serial = 1;
	rt->chip = chip;
	usb_init_urb(urb);
	rt->init_urb = usb6fire_comm_init_urb;
	rt->write8 = usb6fire_comm_write8;
	rt->write16 = usb6fire_comm_write16;

	/* submit an urb that receives communication data from device */
	urb->transfer_buffer = rt->receiver_buffer;
	urb->transfer_buffer_length = COMM_RECEIVER_BUFSIZE;
	urb->pipe = usb_rcvintpipe(chip->dev, COMM_EP);
	urb->dev = chip->dev;
	urb->complete = usb6fire_comm_receiver_handler;
	urb->context = rt;
	urb->interval = 1;
	ret = usb_submit_urb(urb, GFP_KERNEL);
	if (ret < 0) {
		kfree(rt);
		snd_printk(KERN_ERR PREFIX "cannot create comm data receiver.");
		return ret;
	}
	chip->comm = rt;
	return 0;
}

void usb6fire_comm_abort(struct sfire_chip *chip)
{
	struct comm_runtime *rt = chip->comm;

	if (rt)
		usb_poison_urb(&rt->receiver);
}

void usb6fire_comm_destroy(struct sfire_chip *chip)
{
	kfree(chip->comm);
	chip->comm = NULL;
}
OpenPOWER on IntegriCloud