drivers/staging/media/as102/as102_usb_drv.c

   1 /*
   2  * Abilis Systems Single DVB-T Receiver
   3  * Copyright (C) 2008 Pierrick Hascoet <pierrick.hascoet@abilis.com>
   4  * Copyright (C) 2010 Devin Heitmueller <dheitmueller@kernellabs.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2, or (at your option)
   9  * any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20 #include <linux/kernel.h>
  21 #include <linux/errno.h>
  22 #include <linux/slab.h>
  23 #include <linux/mm.h>
  24 #include <linux/usb.h>
  25
  26 #include "as102_drv.h"
  27 #include "as102_usb_drv.h"
  28 #include "as102_fw.h"
  29
  30 static void as102_usb_disconnect(struct usb_interface *interface);
  31 static int as102_usb_probe(struct usb_interface *interface,
  32                            const struct usb_device_id *id);
  33
  34 static int as102_usb_start_stream(struct as102_dev_t *dev);
  35 static void as102_usb_stop_stream(struct as102_dev_t *dev);
  36
  37 static int as102_open(struct inode *inode, struct file *file);
  38 static int as102_release(struct inode *inode, struct file *file);
  39
  40 static struct usb_device_id as102_usb_id_table[] = {
  41         { USB_DEVICE(AS102_USB_DEVICE_VENDOR_ID, AS102_USB_DEVICE_PID_0001) },
  42         { USB_DEVICE(PCTV_74E_USB_VID, PCTV_74E_USB_PID) },
  43         { USB_DEVICE(ELGATO_EYETV_DTT_USB_VID, ELGATO_EYETV_DTT_USB_PID) },
  44         { USB_DEVICE(NBOX_DVBT_DONGLE_USB_VID, NBOX_DVBT_DONGLE_USB_PID) },
  45         { } /* Terminating entry */
  46 };
  47
  48 /* Note that this table must always have the same number of entries as the
  49    as102_usb_id_table struct */
  50 static const char *as102_device_names[] = {
  51         AS102_REFERENCE_DESIGN,
  52         AS102_PCTV_74E,
  53         AS102_ELGATO_EYETV_DTT_NAME,
  54         AS102_NBOX_DVBT_DONGLE_NAME,
  55         NULL /* Terminating entry */
  56 };
  57
  58 struct usb_driver as102_usb_driver = {
  59         .name       =  DRIVER_FULL_NAME,
  60         .probe      =  as102_usb_probe,
  61         .disconnect =  as102_usb_disconnect,
  62         .id_table   =  as102_usb_id_table
  63 };
  64
  65 static const struct file_operations as102_dev_fops = {
  66         .owner   = THIS_MODULE,
  67         .open    = as102_open,
  68         .release = as102_release,
  69 };
  70
  71 static struct usb_class_driver as102_usb_class_driver = {
  72         .name           = "aton2-%d",
  73         .fops           = &as102_dev_fops,
  74         .minor_base     = AS102_DEVICE_MAJOR,
  75 };
  76
  77 static int as102_usb_xfer_cmd(struct as102_bus_adapter_t *bus_adap,
  78                               unsigned char *send_buf, int send_buf_len,
  79                               unsigned char *recv_buf, int recv_buf_len)
  80 {
  81         int ret = 0;
  82         ENTER();
  83
  84         if (send_buf != NULL) {
  85                 ret = usb_control_msg(bus_adap->usb_dev,
  86                                       usb_sndctrlpipe(bus_adap->usb_dev, 0),
  87                                       AS102_USB_DEVICE_TX_CTRL_CMD,
  88                                       USB_DIR_OUT | USB_TYPE_VENDOR |
  89                                       USB_RECIP_DEVICE,
  90                                       bus_adap->cmd_xid, /* value */
  91                                       0, /* index */
  92                                       send_buf, send_buf_len,
  93                                       USB_CTRL_SET_TIMEOUT /* 200 */);
  94                 if (ret < 0) {
  95                         dprintk(debug, "usb_control_msg(send) failed, err %i\n",
  96                                         ret);
  97                         return ret;
  98                 }
  99
 100                 if (ret != send_buf_len) {
 101                         dprintk(debug, "only wrote %d of %d bytes\n",
 102                                         ret, send_buf_len);
 103                         return -1;
 104                 }
 105         }
 106
 107         if (recv_buf != NULL) {
 108 #ifdef TRACE
 109                 dprintk(debug, "want to read: %d bytes\n", recv_buf_len);
 110 #endif
 111                 ret = usb_control_msg(bus_adap->usb_dev,
 112                                       usb_rcvctrlpipe(bus_adap->usb_dev, 0),
 113                                       AS102_USB_DEVICE_RX_CTRL_CMD,
 114                                       USB_DIR_IN | USB_TYPE_VENDOR |
 115                                       USB_RECIP_DEVICE,
 116                                       bus_adap->cmd_xid, /* value */
 117                                       0, /* index */
 118                                       recv_buf, recv_buf_len,
 119                                       USB_CTRL_GET_TIMEOUT /* 200 */);
 120                 if (ret < 0) {
 121                         dprintk(debug, "usb_control_msg(recv) failed, err %i\n",
 122                                         ret);
 123                         return ret;
 124                 }
 125 #ifdef TRACE
 126                 dprintk(debug, "read %d bytes\n", recv_buf_len);
 127 #endif
 128         }
 129
 130         LEAVE();
 131         return ret;
 132 }
 133
 134 static int as102_send_ep1(struct as102_bus_adapter_t *bus_adap,
 135                           unsigned char *send_buf,
 136                           int send_buf_len,
 137                           int swap32)
 138 {
 139         int ret = 0, actual_len;
 140
 141         ret = usb_bulk_msg(bus_adap->usb_dev,
 142                            usb_sndbulkpipe(bus_adap->usb_dev, 1),
 143                            send_buf, send_buf_len, &actual_len, 200);
 144         if (ret) {
 145                 dprintk(debug, "usb_bulk_msg(send) failed, err %i\n", ret);
 146                 return ret;
 147         }
 148
 149         if (actual_len != send_buf_len) {
 150                 dprintk(debug, "only wrote %d of %d bytes\n",
 151                                 actual_len, send_buf_len);
 152                 return -1;
 153         }
 154         return ret ? ret : actual_len;
 155 }
 156
 157 static int as102_read_ep2(struct as102_bus_adapter_t *bus_adap,
 158                    unsigned char *recv_buf, int recv_buf_len)
 159 {
 160         int ret = 0, actual_len;
 161
 162         if (recv_buf == NULL)
 163                 return -EINVAL;
 164
 165         ret = usb_bulk_msg(bus_adap->usb_dev,
 166                            usb_rcvbulkpipe(bus_adap->usb_dev, 2),
 167                            recv_buf, recv_buf_len, &actual_len, 200);
 168         if (ret) {
 169                 dprintk(debug, "usb_bulk_msg(recv) failed, err %i\n", ret);
 170                 return ret;
 171         }
 172
 173         if (actual_len != recv_buf_len) {
 174                 dprintk(debug, "only read %d of %d bytes\n",
 175                                 actual_len, recv_buf_len);
 176                 return -1;
 177         }
 178         return ret ? ret : actual_len;
 179 }
 180
 181 struct as102_priv_ops_t as102_priv_ops = {
 182         .upload_fw_pkt  = as102_send_ep1,
 183         .xfer_cmd       = as102_usb_xfer_cmd,
 184         .as102_read_ep2 = as102_read_ep2,
 185         .start_stream   = as102_usb_start_stream,
 186         .stop_stream    = as102_usb_stop_stream,
 187 };
 188
 189 static int as102_submit_urb_stream(struct as102_dev_t *dev, struct urb *urb)
 190 {
 191         int err;
 192
 193         usb_fill_bulk_urb(urb,
 194                           dev->bus_adap.usb_dev,
 195                           usb_rcvbulkpipe(dev->bus_adap.usb_dev, 0x2),
 196                           urb->transfer_buffer,
 197                           AS102_USB_BUF_SIZE,
 198                           as102_urb_stream_irq,
 199                           dev);
 200
 201         err = usb_submit_urb(urb, GFP_ATOMIC);
 202         if (err)
 203                 dprintk(debug, "%s: usb_submit_urb failed\n", __func__);
 204
 205         return err;
 206 }
 207
 208 #if (LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 18))
 209 void as102_urb_stream_irq(struct urb *urb, struct pt_regs *regs)
 210 #else
 211 void as102_urb_stream_irq(struct urb *urb)
 212 #endif
 213 {
 214         struct as102_dev_t *as102_dev = urb->context;
 215
 216         if (urb->actual_length > 0) {
 217                 dvb_dmx_swfilter(&as102_dev->dvb_dmx,
 218                                  urb->transfer_buffer,
 219                                  urb->actual_length);
 220         } else {
 221                 if (urb->actual_length == 0)
 222                         memset(urb->transfer_buffer, 0, AS102_USB_BUF_SIZE);
 223         }
 224
 225         /* is not stopped, re-submit urb */
 226         if (as102_dev->streaming)
 227                 as102_submit_urb_stream(as102_dev, urb);
 228 }
 229
 230 static void as102_free_usb_stream_buffer(struct as102_dev_t *dev)
 231 {
 232         int i;
 233
 234         ENTER();
 235
 236         for (i = 0; i < MAX_STREAM_URB; i++)
 237                 usb_free_urb(dev->stream_urb[i]);
 238
 239         usb_free_coherent(dev->bus_adap.usb_dev,
 240                         MAX_STREAM_URB * AS102_USB_BUF_SIZE,
 241                         dev->stream,
 242                         dev->dma_addr);
 243         LEAVE();
 244 }
 245
 246 static int as102_alloc_usb_stream_buffer(struct as102_dev_t *dev)
 247 {
 248         int i, ret = 0;
 249
 250         ENTER();
 251
 252         dev->stream = usb_alloc_coherent(dev->bus_adap.usb_dev,
 253                                        MAX_STREAM_URB * AS102_USB_BUF_SIZE,
 254                                        GFP_KERNEL,
 255                                        &dev->dma_addr);
 256         if (!dev->stream) {
 257                 dprintk(debug, "%s: usb_buffer_alloc failed\n", __func__);
 258                 return -ENOMEM;
 259         }
 260
 261         memset(dev->stream, 0, MAX_STREAM_URB * AS102_USB_BUF_SIZE);
 262
 263         /* init urb buffers */
 264         for (i = 0; i < MAX_STREAM_URB; i++) {
 265                 struct urb *urb;
 266
 267                 urb = usb_alloc_urb(0, GFP_ATOMIC);
 268                 if (urb == NULL) {
 269                         dprintk(debug, "%s: usb_alloc_urb failed\n", __func__);
 270                         as102_free_usb_stream_buffer(dev);
 271                         return -ENOMEM;
 272                 }
 273
 274                 urb->transfer_buffer = dev->stream + (i * AS102_USB_BUF_SIZE);
 275                 urb->transfer_buffer_length = AS102_USB_BUF_SIZE;
 276
 277                 dev->stream_urb[i] = urb;
 278         }
 279         LEAVE();
 280         return ret;
 281 }
 282
 283 static void as102_usb_stop_stream(struct as102_dev_t *dev)
 284 {
 285         int i;
 286
 287         for (i = 0; i < MAX_STREAM_URB; i++)
 288                 usb_kill_urb(dev->stream_urb[i]);
 289 }
 290
 291 static int as102_usb_start_stream(struct as102_dev_t *dev)
 292 {
 293         int i, ret = 0;
 294
 295         for (i = 0; i < MAX_STREAM_URB; i++) {
 296                 ret = as102_submit_urb_stream(dev, dev->stream_urb[i]);
 297                 if (ret) {
 298                         as102_usb_stop_stream(dev);
 299                         return ret;
 300                 }
 301         }
 302
 303         return 0;
 304 }
 305
 306 static void as102_usb_release(struct kref *kref)
 307 {
 308         struct as102_dev_t *as102_dev;
 309
 310         ENTER();
 311
 312         as102_dev = container_of(kref, struct as102_dev_t, kref);
 313         if (as102_dev != NULL) {
 314                 usb_put_dev(as102_dev->bus_adap.usb_dev);
 315                 kfree(as102_dev);
 316         }
 317
 318         LEAVE();
 319 }
 320
 321 static void as102_usb_disconnect(struct usb_interface *intf)
 322 {
 323         struct as102_dev_t *as102_dev;
 324
 325         ENTER();
 326
 327         /* extract as102_dev_t from usb_device private data */
 328         as102_dev = usb_get_intfdata(intf);
 329
 330         /* unregister dvb layer */
 331         as102_dvb_unregister(as102_dev);
 332
 333         /* free usb buffers */
 334         as102_free_usb_stream_buffer(as102_dev);
 335
 336         usb_set_intfdata(intf, NULL);
 337
 338         /* usb unregister device */
 339         usb_deregister_dev(intf, &as102_usb_class_driver);
 340
 341         /* decrement usage counter */
 342         kref_put(&as102_dev->kref, as102_usb_release);
 343
 344         printk(KERN_INFO "%s: device has been disconnected\n", DRIVER_NAME);
 345
 346         LEAVE();
 347 }
 348
 349 static int as102_usb_probe(struct usb_interface *intf,
 350                            const struct usb_device_id *id)
 351 {
 352         int ret;
 353         struct as102_dev_t *as102_dev;
 354         int i;
 355
 356         ENTER();
 357
 358         as102_dev = kzalloc(sizeof(struct as102_dev_t), GFP_KERNEL);
 359         if (as102_dev == NULL) {
 360                 err("%s: kzalloc failed", __func__);
 361                 return -ENOMEM;
 362         }
 363
 364         /* This should never actually happen */
 365         if ((sizeof(as102_usb_id_table) / sizeof(struct usb_device_id)) !=
 366             (sizeof(as102_device_names) / sizeof(const char *))) {
 367                 printk(KERN_ERR "Device names table invalid size");
 368                 return -EINVAL;
 369         }
 370
 371         /* Assign the user-friendly device name */
 372         for (i = 0; i < (sizeof(as102_usb_id_table) /
 373                          sizeof(struct usb_device_id)); i++) {
 374                 if (id == &as102_usb_id_table[i])
 375                         as102_dev->name = as102_device_names[i];
 376         }
 377
 378         if (as102_dev->name == NULL)
 379                 as102_dev->name = "Unknown AS102 device";
 380
 381         /* set private callback functions */
 382         as102_dev->bus_adap.ops = &as102_priv_ops;
 383
 384         /* init cmd token for usb bus */
 385         as102_dev->bus_adap.cmd = &as102_dev->bus_adap.token.usb.c;
 386         as102_dev->bus_adap.rsp = &as102_dev->bus_adap.token.usb.r;
 387
 388         /* init kernel device reference */
 389         kref_init(&as102_dev->kref);
 390
 391         /* store as102 device to usb_device private data */
 392         usb_set_intfdata(intf, (void *) as102_dev);
 393
 394         /* store in as102 device the usb_device pointer */
 395         as102_dev->bus_adap.usb_dev = usb_get_dev(interface_to_usbdev(intf));
 396
 397         /* we can register the device now, as it is ready */
 398         ret = usb_register_dev(intf, &as102_usb_class_driver);
 399         if (ret < 0) {
 400                 /* something prevented us from registering this driver */
 401                 err("%s: usb_register_dev() failed (errno = %d)",
 402                     __func__, ret);
 403                 goto failed;
 404         }
 405
 406         printk(KERN_INFO "%s: device has been detected\n", DRIVER_NAME);
 407
 408         /* request buffer allocation for streaming */
 409         ret = as102_alloc_usb_stream_buffer(as102_dev);
 410         if (ret != 0)
 411                 goto failed;
 412
 413         /* register dvb layer */
 414         ret = as102_dvb_register(as102_dev);
 415
 416         LEAVE();
 417         return ret;
 418
 419 failed:
 420         usb_set_intfdata(intf, NULL);
 421         kfree(as102_dev);
 422         return ret;
 423 }
 424
 425 static int as102_open(struct inode *inode, struct file *file)
 426 {
 427         int ret = 0, minor = 0;
 428         struct usb_interface *intf = NULL;
 429         struct as102_dev_t *dev = NULL;
 430
 431         ENTER();
 432
 433         /* read minor from inode */
 434         minor = iminor(inode);
 435
 436         /* fetch device from usb interface */
 437         intf = usb_find_interface(&as102_usb_driver, minor);
 438         if (intf == NULL) {
 439                 printk(KERN_ERR "%s: can't find device for minor %d\n",
 440                                 __func__, minor);
 441                 ret = -ENODEV;
 442                 goto exit;
 443         }
 444
 445         /* get our device */
 446         dev = usb_get_intfdata(intf);
 447         if (dev == NULL) {
 448                 ret = -EFAULT;
 449                 goto exit;
 450         }
 451
 452         /* save our device object in the file's private structure */
 453         file->private_data = dev;
 454
 455         /* increment our usage count for the device */
 456         kref_get(&dev->kref);
 457
 458 exit:
 459         LEAVE();
 460         return ret;
 461 }
 462
 463 static int as102_release(struct inode *inode, struct file *file)
 464 {
 465         int ret = 0;
 466         struct as102_dev_t *dev = NULL;
 467
 468         ENTER();
 469
 470         dev = file->private_data;
 471         if (dev != NULL) {
 472                 /* decrement the count on our device */
 473                 kref_put(&dev->kref, as102_usb_release);
 474         }
 475
 476         LEAVE();
 477         return ret;
 478 }
 479
 480 MODULE_DEVICE_TABLE(usb, as102_usb_id_table);
 481
 482 /* EOF - vim: set textwidth=80 ts=8 sw=8 sts=8 noet: */