2 * Linux driver for TerraTec DMX 6Fire USB
4 * Device communications
6 * Author: Torsten Schenk <torsten.schenk@zoho.com>
7 * Created: Jan 01, 2011
8 * Copyright: (C) Torsten Schenk
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
25 static void usb6fire_comm_init_urb(struct comm_runtime *rt, struct urb *urb,
26 u8 *buffer, void *context, void(*handler)(struct urb *urb))
29 urb->transfer_buffer = buffer;
30 urb->pipe = usb_sndintpipe(rt->chip->dev, COMM_EP);
31 urb->complete = handler;
32 urb->context = context;
34 urb->dev = rt->chip->dev;
37 static void usb6fire_comm_receiver_handler(struct urb *urb)
39 struct comm_runtime *rt = urb->context;
40 struct midi_runtime *midi_rt = rt->chip->midi;
43 if (rt->receiver_buffer[0] == 0x10) /* midi in event */
45 midi_rt->in_received(midi_rt,
46 rt->receiver_buffer + 2,
47 rt->receiver_buffer[1]);
50 if (!rt->chip->shutdown) {
52 urb->actual_length = 0;
53 if (usb_submit_urb(urb, GFP_ATOMIC) < 0)
54 dev_warn(&urb->dev->dev,
55 "comm data receiver aborted.\n");
59 static void usb6fire_comm_init_buffer(u8 *buffer, u8 id, u8 request,
67 buffer[1] = 0x05; /* length (starting at buffer[2]) */
74 buffer[1] = 0x0b; /* length (starting at buffer[2]) */
96 static int usb6fire_comm_send_buffer(u8 *buffer, struct usb_device *dev)
101 ret = usb_interrupt_msg(dev, usb_sndintpipe(dev, COMM_EP),
102 buffer, buffer[1] + 2, &actual_len, HZ);
105 else if (actual_len != buffer[1] + 2)
110 static int usb6fire_comm_write8(struct comm_runtime *rt, u8 request,
116 /* 13: maximum length of message */
117 buffer = kmalloc(13, GFP_KERNEL);
121 usb6fire_comm_init_buffer(buffer, 0x00, request, reg, value, 0x00);
122 ret = usb6fire_comm_send_buffer(buffer, rt->chip->dev);
128 static int usb6fire_comm_write16(struct comm_runtime *rt, u8 request,
129 u8 reg, u8 vl, u8 vh)
134 /* 13: maximum length of message */
135 buffer = kmalloc(13, GFP_KERNEL);
139 usb6fire_comm_init_buffer(buffer, 0x00, request, reg, vl, vh);
140 ret = usb6fire_comm_send_buffer(buffer, rt->chip->dev);
146 int usb6fire_comm_init(struct sfire_chip *chip)
148 struct comm_runtime *rt = kzalloc(sizeof(struct comm_runtime),
156 rt->receiver_buffer = kzalloc(COMM_RECEIVER_BUFSIZE, GFP_KERNEL);
157 if (!rt->receiver_buffer) {
166 rt->init_urb = usb6fire_comm_init_urb;
167 rt->write8 = usb6fire_comm_write8;
168 rt->write16 = usb6fire_comm_write16;
170 /* submit an urb that receives communication data from device */
171 urb->transfer_buffer = rt->receiver_buffer;
172 urb->transfer_buffer_length = COMM_RECEIVER_BUFSIZE;
173 urb->pipe = usb_rcvintpipe(chip->dev, COMM_EP);
174 urb->dev = chip->dev;
175 urb->complete = usb6fire_comm_receiver_handler;
178 ret = usb_submit_urb(urb, GFP_KERNEL);
180 kfree(rt->receiver_buffer);
182 dev_err(&chip->dev->dev, "cannot create comm data receiver.");
189 void usb6fire_comm_abort(struct sfire_chip *chip)
191 struct comm_runtime *rt = chip->comm;
194 usb_poison_urb(&rt->receiver);
197 void usb6fire_comm_destroy(struct sfire_chip *chip)
199 struct comm_runtime *rt = chip->comm;
201 kfree(rt->receiver_buffer);