1 /* 2 * Line 6 Linux USB driver 3 * 4 * Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at) 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License as 8 * published by the Free Software Foundation, version 2. 9 * 10 */ 11 12 #include <linux/slab.h> 13 #include <sound/core.h> 14 #include <sound/pcm.h> 15 #include <sound/pcm_params.h> 16 17 #include "capture.h" 18 #include "driver.h" 19 #include "pcm.h" 20 21 /* 22 Find a free URB and submit it. 23 must be called in line6pcm->in.lock context 24 */ 25 static int submit_audio_in_urb(struct snd_line6_pcm *line6pcm) 26 { 27 int index; 28 int i, urb_size; 29 int ret; 30 struct urb *urb_in; 31 32 index = find_first_zero_bit(&line6pcm->in.active_urbs, 33 line6pcm->line6->iso_buffers); 34 35 if (index < 0 || index >= line6pcm->line6->iso_buffers) { 36 dev_err(line6pcm->line6->ifcdev, "no free URB found\n"); 37 return -EINVAL; 38 } 39 40 urb_in = line6pcm->in.urbs[index]; 41 urb_size = 0; 42 43 for (i = 0; i < LINE6_ISO_PACKETS; ++i) { 44 struct usb_iso_packet_descriptor *fin = 45 &urb_in->iso_frame_desc[i]; 46 fin->offset = urb_size; 47 fin->length = line6pcm->max_packet_size_in; 48 urb_size += line6pcm->max_packet_size_in; 49 } 50 51 urb_in->transfer_buffer = 52 line6pcm->in.buffer + 53 index * LINE6_ISO_PACKETS * line6pcm->max_packet_size_in; 54 urb_in->transfer_buffer_length = urb_size; 55 urb_in->context = line6pcm; 56 57 ret = usb_submit_urb(urb_in, GFP_ATOMIC); 58 59 if (ret == 0) 60 set_bit(index, &line6pcm->in.active_urbs); 61 else 62 dev_err(line6pcm->line6->ifcdev, 63 "URB in #%d submission failed (%d)\n", index, ret); 64 65 return 0; 66 } 67 68 /* 69 Submit all currently available capture URBs. 70 must be called in line6pcm->in.lock context 71 */ 72 int line6_submit_audio_in_all_urbs(struct snd_line6_pcm *line6pcm) 73 { 74 int ret = 0, i; 75 76 for (i = 0; i < line6pcm->line6->iso_buffers; ++i) { 77 ret = submit_audio_in_urb(line6pcm); 78 if (ret < 0) 79 break; 80 } 81 82 return ret; 83 } 84 85 /* 86 Copy data into ALSA capture buffer. 87 */ 88 void line6_capture_copy(struct snd_line6_pcm *line6pcm, char *fbuf, int fsize) 89 { 90 struct snd_pcm_substream *substream = 91 get_substream(line6pcm, SNDRV_PCM_STREAM_CAPTURE); 92 struct snd_pcm_runtime *runtime = substream->runtime; 93 const int bytes_per_frame = 94 line6pcm->properties->bytes_per_channel * 95 line6pcm->properties->capture_hw.channels_max; 96 int frames = fsize / bytes_per_frame; 97 98 if (runtime == NULL) 99 return; 100 101 if (line6pcm->in.pos_done + frames > runtime->buffer_size) { 102 /* 103 The transferred area goes over buffer boundary, 104 copy two separate chunks. 105 */ 106 int len; 107 108 len = runtime->buffer_size - line6pcm->in.pos_done; 109 110 if (len > 0) { 111 memcpy(runtime->dma_area + 112 line6pcm->in.pos_done * bytes_per_frame, fbuf, 113 len * bytes_per_frame); 114 memcpy(runtime->dma_area, fbuf + len * bytes_per_frame, 115 (frames - len) * bytes_per_frame); 116 } else { 117 /* this is somewhat paranoid */ 118 dev_err(line6pcm->line6->ifcdev, 119 "driver bug: len = %d\n", len); 120 } 121 } else { 122 /* copy single chunk */ 123 memcpy(runtime->dma_area + 124 line6pcm->in.pos_done * bytes_per_frame, fbuf, fsize); 125 } 126 127 line6pcm->in.pos_done += frames; 128 if (line6pcm->in.pos_done >= runtime->buffer_size) 129 line6pcm->in.pos_done -= runtime->buffer_size; 130 } 131 132 void line6_capture_check_period(struct snd_line6_pcm *line6pcm, int length) 133 { 134 struct snd_pcm_substream *substream = 135 get_substream(line6pcm, SNDRV_PCM_STREAM_CAPTURE); 136 137 line6pcm->in.bytes += length; 138 if (line6pcm->in.bytes >= line6pcm->in.period) { 139 line6pcm->in.bytes %= line6pcm->in.period; 140 spin_unlock(&line6pcm->in.lock); 141 snd_pcm_period_elapsed(substream); 142 spin_lock(&line6pcm->in.lock); 143 } 144 } 145 146 /* 147 * Callback for completed capture URB. 148 */ 149 static void audio_in_callback(struct urb *urb) 150 { 151 int i, index, length = 0, shutdown = 0; 152 unsigned long flags; 153 154 struct snd_line6_pcm *line6pcm = (struct snd_line6_pcm *)urb->context; 155 156 line6pcm->in.last_frame = urb->start_frame; 157 158 /* find index of URB */ 159 for (index = 0; index < line6pcm->line6->iso_buffers; ++index) 160 if (urb == line6pcm->in.urbs[index]) 161 break; 162 163 spin_lock_irqsave(&line6pcm->in.lock, flags); 164 165 for (i = 0; i < LINE6_ISO_PACKETS; ++i) { 166 char *fbuf; 167 int fsize; 168 struct usb_iso_packet_descriptor *fin = &urb->iso_frame_desc[i]; 169 170 if (fin->status == -EXDEV) { 171 shutdown = 1; 172 break; 173 } 174 175 fbuf = urb->transfer_buffer + fin->offset; 176 fsize = fin->actual_length; 177 178 if (fsize > line6pcm->max_packet_size_in) { 179 dev_err(line6pcm->line6->ifcdev, 180 "driver and/or device bug: packet too large (%d > %d)\n", 181 fsize, line6pcm->max_packet_size_in); 182 } 183 184 length += fsize; 185 186 BUILD_BUG_ON_MSG(LINE6_ISO_PACKETS != 1, 187 "The following code assumes LINE6_ISO_PACKETS == 1"); 188 /* TODO: 189 * Also, if iso_buffers != 2, the prev frame is almost random at 190 * playback side. 191 * This needs to be redesigned. It should be "stable", but we may 192 * experience sync problems on such high-speed configs. 193 */ 194 195 line6pcm->prev_fbuf = fbuf; 196 line6pcm->prev_fsize = fsize / 197 (line6pcm->properties->bytes_per_channel * 198 line6pcm->properties->capture_hw.channels_max); 199 200 if (!test_bit(LINE6_STREAM_IMPULSE, &line6pcm->in.running) && 201 test_bit(LINE6_STREAM_PCM, &line6pcm->in.running) && 202 fsize > 0) 203 line6_capture_copy(line6pcm, fbuf, fsize); 204 } 205 206 clear_bit(index, &line6pcm->in.active_urbs); 207 208 if (test_and_clear_bit(index, &line6pcm->in.unlink_urbs)) 209 shutdown = 1; 210 211 if (!shutdown) { 212 submit_audio_in_urb(line6pcm); 213 214 if (!test_bit(LINE6_STREAM_IMPULSE, &line6pcm->in.running) && 215 test_bit(LINE6_STREAM_PCM, &line6pcm->in.running)) 216 line6_capture_check_period(line6pcm, length); 217 } 218 219 spin_unlock_irqrestore(&line6pcm->in.lock, flags); 220 } 221 222 /* open capture callback */ 223 static int snd_line6_capture_open(struct snd_pcm_substream *substream) 224 { 225 int err; 226 struct snd_pcm_runtime *runtime = substream->runtime; 227 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream); 228 229 err = snd_pcm_hw_constraint_ratdens(runtime, 0, 230 SNDRV_PCM_HW_PARAM_RATE, 231 &line6pcm->properties->rates); 232 if (err < 0) 233 return err; 234 235 line6_pcm_acquire(line6pcm, LINE6_STREAM_CAPTURE_HELPER, false); 236 237 runtime->hw = line6pcm->properties->capture_hw; 238 return 0; 239 } 240 241 /* close capture callback */ 242 static int snd_line6_capture_close(struct snd_pcm_substream *substream) 243 { 244 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream); 245 246 line6_pcm_release(line6pcm, LINE6_STREAM_CAPTURE_HELPER); 247 return 0; 248 } 249 250 /* capture operators */ 251 struct snd_pcm_ops snd_line6_capture_ops = { 252 .open = snd_line6_capture_open, 253 .close = snd_line6_capture_close, 254 .ioctl = snd_pcm_lib_ioctl, 255 .hw_params = snd_line6_hw_params, 256 .hw_free = snd_line6_hw_free, 257 .prepare = snd_line6_prepare, 258 .trigger = snd_line6_trigger, 259 .pointer = snd_line6_pointer, 260 }; 261 262 int line6_create_audio_in_urbs(struct snd_line6_pcm *line6pcm) 263 { 264 struct usb_line6 *line6 = line6pcm->line6; 265 int i; 266 267 line6pcm->in.urbs = kzalloc( 268 sizeof(struct urb *) * line6->iso_buffers, GFP_KERNEL); 269 if (line6pcm->in.urbs == NULL) 270 return -ENOMEM; 271 272 /* create audio URBs and fill in constant values: */ 273 for (i = 0; i < line6->iso_buffers; ++i) { 274 struct urb *urb; 275 276 /* URB for audio in: */ 277 urb = line6pcm->in.urbs[i] = 278 usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL); 279 280 if (urb == NULL) 281 return -ENOMEM; 282 283 urb->dev = line6->usbdev; 284 urb->pipe = 285 usb_rcvisocpipe(line6->usbdev, 286 line6->properties->ep_audio_r & 287 USB_ENDPOINT_NUMBER_MASK); 288 urb->transfer_flags = URB_ISO_ASAP; 289 urb->start_frame = -1; 290 urb->number_of_packets = LINE6_ISO_PACKETS; 291 urb->interval = LINE6_ISO_INTERVAL; 292 urb->error_count = 0; 293 urb->complete = audio_in_callback; 294 } 295 296 return 0; 297 } 298