--- /dev/null
+/*
+ * Linux driver for TerraTec DMX 6Fire USB
+ *
+ * Device communications
+ *
+ * Author: Torsten Schenk <torsten.schenk@zoho.com>
+ * Created: Jan 01, 2011
+ * 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)
+ dev_warn(&urb->dev->dev,
+ "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;
+ int ret;
+
+ /* 13: maximum length of message */
+ buffer = kmalloc(13, GFP_KERNEL);
+ if (!buffer)
+ return -ENOMEM;
+
+ usb6fire_comm_init_buffer(buffer, 0x00, request, reg, value, 0x00);
+ ret = usb6fire_comm_send_buffer(buffer, rt->chip->dev);
+
+ kfree(buffer);
+ return ret;
+}
+
+static int usb6fire_comm_write16(struct comm_runtime *rt, u8 request,
+ u8 reg, u8 vl, u8 vh)
+{
+ u8 *buffer;
+ int ret;
+
+ /* 13: maximum length of message */
+ buffer = kmalloc(13, GFP_KERNEL);
+ if (!buffer)
+ return -ENOMEM;
+
+ usb6fire_comm_init_buffer(buffer, 0x00, request, reg, vl, vh);
+ ret = usb6fire_comm_send_buffer(buffer, rt->chip->dev);
+
+ kfree(buffer);
+ return ret;
+}
+
+int usb6fire_comm_init(struct sfire_chip *chip)
+{
+ struct comm_runtime *rt = kzalloc(sizeof(struct comm_runtime),
+ GFP_KERNEL);
+ struct urb *urb;
+ int ret;
+
+ if (!rt)
+ return -ENOMEM;
+
+ rt->receiver_buffer = kzalloc(COMM_RECEIVER_BUFSIZE, GFP_KERNEL);
+ if (!rt->receiver_buffer) {
+ kfree(rt);
+ return -ENOMEM;
+ }
+
+ urb = &rt->receiver;
+ 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->receiver_buffer);
+ kfree(rt);
+ dev_err(&chip->dev->dev, "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)
+{
+ struct comm_runtime *rt = chip->comm;
+
+ kfree(rt->receiver_buffer);
+ kfree(rt);
+ chip->comm = NULL;
+}
Code Review / kvmfornfv.git / blobdiff