/* * Linux driver for TerraTec DMX 6Fire USB * * Device communications * * Author: Torsten Schenk * 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; } value='10'>10space:mode:
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