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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 | // SPDX-License-Identifier: GPL-2.0-or-later /* * Linux driver for TerraTec DMX 6Fire USB * * Device communications * * Author: Torsten Schenk <torsten.schenk@zoho.com> * Created: Jan 01, 2011 * Copyright: (C) Torsten Schenk */ #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, 1000); 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; } |