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 = 33 find_first_zero_bit(&line6pcm->in.active_urbs, LINE6_ISO_BUFFERS); 34 35 if (index < 0 || index >= 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; 48 urb_size += line6pcm->max_packet_size; 49 } 50 51 urb_in->transfer_buffer = 52 line6pcm->in.buffer + 53 index * LINE6_ISO_PACKETS * line6pcm->max_packet_size; 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 < 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 = line6pcm->properties->bytes_per_frame; 94 int frames = fsize / bytes_per_frame; 95 96 if (runtime == NULL) 97 return; 98 99 if (line6pcm->in.pos_done + frames > runtime->buffer_size) { 100 /* 101 The transferred area goes over buffer boundary, 102 copy two separate chunks. 103 */ 104 int len; 105 106 len = runtime->buffer_size - line6pcm->in.pos_done; 107 108 if (len > 0) { 109 memcpy(runtime->dma_area + 110 line6pcm->in.pos_done * bytes_per_frame, fbuf, 111 len * bytes_per_frame); 112 memcpy(runtime->dma_area, fbuf + len * bytes_per_frame, 113 (frames - len) * bytes_per_frame); 114 } else { 115 /* this is somewhat paranoid */ 116 dev_err(line6pcm->line6->ifcdev, 117 "driver bug: len = %d\n", len); 118 } 119 } else { 120 /* copy single chunk */ 121 memcpy(runtime->dma_area + 122 line6pcm->in.pos_done * bytes_per_frame, fbuf, fsize); 123 } 124 125 line6pcm->in.pos_done += frames; 126 if (line6pcm->in.pos_done >= runtime->buffer_size) 127 line6pcm->in.pos_done -= runtime->buffer_size; 128 } 129 130 void line6_capture_check_period(struct snd_line6_pcm *line6pcm, int length) 131 { 132 struct snd_pcm_substream *substream = 133 get_substream(line6pcm, SNDRV_PCM_STREAM_CAPTURE); 134 135 line6pcm->in.bytes += length; 136 if (line6pcm->in.bytes >= line6pcm->in.period) { 137 line6pcm->in.bytes %= line6pcm->in.period; 138 spin_unlock(&line6pcm->in.lock); 139 snd_pcm_period_elapsed(substream); 140 spin_lock(&line6pcm->in.lock); 141 } 142 } 143 144 /* 145 * Callback for completed capture URB. 146 */ 147 static void audio_in_callback(struct urb *urb) 148 { 149 int i, index, length = 0, shutdown = 0; 150 unsigned long flags; 151 152 struct snd_line6_pcm *line6pcm = (struct snd_line6_pcm *)urb->context; 153 154 line6pcm->in.last_frame = urb->start_frame; 155 156 /* find index of URB */ 157 for (index = 0; index < LINE6_ISO_BUFFERS; ++index) 158 if (urb == line6pcm->in.urbs[index]) 159 break; 160 161 spin_lock_irqsave(&line6pcm->in.lock, flags); 162 163 for (i = 0; i < LINE6_ISO_PACKETS; ++i) { 164 char *fbuf; 165 int fsize; 166 struct usb_iso_packet_descriptor *fin = &urb->iso_frame_desc[i]; 167 168 if (fin->status == -EXDEV) { 169 shutdown = 1; 170 break; 171 } 172 173 fbuf = urb->transfer_buffer + fin->offset; 174 fsize = fin->actual_length; 175 176 if (fsize > line6pcm->max_packet_size) { 177 dev_err(line6pcm->line6->ifcdev, 178 "driver and/or device bug: packet too large (%d > %d)\n", 179 fsize, line6pcm->max_packet_size); 180 } 181 182 length += fsize; 183 184 /* the following assumes LINE6_ISO_PACKETS == 1: */ 185 line6pcm->prev_fbuf = fbuf; 186 line6pcm->prev_fsize = fsize; 187 188 if (!test_bit(LINE6_STREAM_IMPULSE, &line6pcm->in.running) && 189 test_bit(LINE6_STREAM_PCM, &line6pcm->in.running) && 190 fsize > 0) 191 line6_capture_copy(line6pcm, fbuf, fsize); 192 } 193 194 clear_bit(index, &line6pcm->in.active_urbs); 195 196 if (test_and_clear_bit(index, &line6pcm->in.unlink_urbs)) 197 shutdown = 1; 198 199 if (!shutdown) { 200 submit_audio_in_urb(line6pcm); 201 202 if (!test_bit(LINE6_STREAM_IMPULSE, &line6pcm->in.running) && 203 test_bit(LINE6_STREAM_PCM, &line6pcm->in.running)) 204 line6_capture_check_period(line6pcm, length); 205 } 206 207 spin_unlock_irqrestore(&line6pcm->in.lock, flags); 208 } 209 210 /* open capture callback */ 211 static int snd_line6_capture_open(struct snd_pcm_substream *substream) 212 { 213 int err; 214 struct snd_pcm_runtime *runtime = substream->runtime; 215 struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream); 216 217 err = snd_pcm_hw_constraint_ratdens(runtime, 0, 218 SNDRV_PCM_HW_PARAM_RATE, 219 &line6pcm->properties->rates); 220 if (err < 0) 221 return err; 222 223 runtime->hw = line6pcm->properties->capture_hw; 224 return 0; 225 } 226 227 /* close capture callback */ 228 static int snd_line6_capture_close(struct snd_pcm_substream *substream) 229 { 230 return 0; 231 } 232 233 /* capture operators */ 234 struct snd_pcm_ops snd_line6_capture_ops = { 235 .open = snd_line6_capture_open, 236 .close = snd_line6_capture_close, 237 .ioctl = snd_pcm_lib_ioctl, 238 .hw_params = snd_line6_hw_params, 239 .hw_free = snd_line6_hw_free, 240 .prepare = snd_line6_prepare, 241 .trigger = snd_line6_trigger, 242 .pointer = snd_line6_pointer, 243 }; 244 245 int line6_create_audio_in_urbs(struct snd_line6_pcm *line6pcm) 246 { 247 struct usb_line6 *line6 = line6pcm->line6; 248 int i; 249 250 /* create audio URBs and fill in constant values: */ 251 for (i = 0; i < LINE6_ISO_BUFFERS; ++i) { 252 struct urb *urb; 253 254 /* URB for audio in: */ 255 urb = line6pcm->in.urbs[i] = 256 usb_alloc_urb(LINE6_ISO_PACKETS, GFP_KERNEL); 257 258 if (urb == NULL) 259 return -ENOMEM; 260 261 urb->dev = line6->usbdev; 262 urb->pipe = 263 usb_rcvisocpipe(line6->usbdev, 264 line6->properties->ep_audio_r & 265 USB_ENDPOINT_NUMBER_MASK); 266 urb->transfer_flags = URB_ISO_ASAP; 267 urb->start_frame = -1; 268 urb->number_of_packets = LINE6_ISO_PACKETS; 269 urb->interval = LINE6_ISO_INTERVAL; 270 urb->error_count = 0; 271 urb->complete = audio_in_callback; 272 } 273 274 return 0; 275 } 276