kernel/drivers/media/usb/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 #include <linux/kernel.h>
  17 #include <linux/errno.h>
  18 #include <linux/slab.h>
  19 #include <linux/mm.h>
  20 #include <linux/usb.h>
  21
  22 #include "as102_drv.h"
  23 #include "as102_usb_drv.h"
  24 #include "as102_fw.h"
  25
  26 static void as102_usb_disconnect(struct usb_interface *interface);
  27 static int as102_usb_probe(struct usb_interface *interface,
  28                            const struct usb_device_id *id);
  29
  30 static int as102_usb_start_stream(struct as102_dev_t *dev);
  31 static void as102_usb_stop_stream(struct as102_dev_t *dev);
  32
  33 static int as102_open(struct inode *inode, struct file *file);
  34 static int as102_release(struct inode *inode, struct file *file);
  35
  36 static struct usb_device_id as102_usb_id_table[] = {
  37         { USB_DEVICE(AS102_USB_DEVICE_VENDOR_ID, AS102_USB_DEVICE_PID_0001) },
  38         { USB_DEVICE(PCTV_74E_USB_VID, PCTV_74E_USB_PID) },
  39         { USB_DEVICE(ELGATO_EYETV_DTT_USB_VID, ELGATO_EYETV_DTT_USB_PID) },
  40         { USB_DEVICE(NBOX_DVBT_DONGLE_USB_VID, NBOX_DVBT_DONGLE_USB_PID) },
  41         { USB_DEVICE(SKY_IT_DIGITAL_KEY_USB_VID, SKY_IT_DIGITAL_KEY_USB_PID) },
  42         { } /* Terminating entry */
  43 };
  44
  45 /* Note that this table must always have the same number of entries as the
  46    as102_usb_id_table struct */
  47 static const char * const as102_device_names[] = {
  48         AS102_REFERENCE_DESIGN,
  49         AS102_PCTV_74E,
  50         AS102_ELGATO_EYETV_DTT_NAME,
  51         AS102_NBOX_DVBT_DONGLE_NAME,
  52         AS102_SKY_IT_DIGITAL_KEY_NAME,
  53         NULL /* Terminating entry */
  54 };
  55
  56 /* eLNA configuration: devices built on the reference design work best
  57    with 0xA0, while custom designs seem to require 0xC0 */
  58 static uint8_t const as102_elna_cfg[] = {
  59         0xA0,
  60         0xC0,
  61         0xC0,
  62         0xA0,
  63         0xA0,
  64         0x00 /* Terminating entry */
  65 };
  66
  67 struct usb_driver as102_usb_driver = {
  68         .name           = DRIVER_FULL_NAME,
  69         .probe          = as102_usb_probe,
  70         .disconnect     = as102_usb_disconnect,
  71         .id_table       = as102_usb_id_table
  72 };
  73
  74 static const struct file_operations as102_dev_fops = {
  75         .owner          = THIS_MODULE,
  76         .open           = as102_open,
  77         .release        = as102_release,
  78 };
  79
  80 static struct usb_class_driver as102_usb_class_driver = {
  81         .name           = "aton2-%d",
  82         .fops           = &as102_dev_fops,
  83         .minor_base     = AS102_DEVICE_MAJOR,
  84 };
  85
  86 static int as102_usb_xfer_cmd(struct as10x_bus_adapter_t *bus_adap,
  87                               unsigned char *send_buf, int send_buf_len,
  88                               unsigned char *recv_buf, int recv_buf_len)
  89 {
  90         int ret = 0;
  91
  92         if (send_buf != NULL) {
  93                 ret = usb_control_msg(bus_adap->usb_dev,
  94                                       usb_sndctrlpipe(bus_adap->usb_dev, 0),
  95                                       AS102_USB_DEVICE_TX_CTRL_CMD,
  96                                       USB_DIR_OUT | USB_TYPE_VENDOR |
  97                                       USB_RECIP_DEVICE,
  98                                       bus_adap->cmd_xid, /* value */
  99                                       0, /* index */
 100                                       send_buf, send_buf_len,
 101                                       USB_CTRL_SET_TIMEOUT /* 200 */);
 102                 if (ret < 0) {
 103                         dev_dbg(&bus_adap->usb_dev->dev,
 104                                 "usb_control_msg(send) failed, err %i\n", ret);
 105                         return ret;
 106                 }
 107
 108                 if (ret != send_buf_len) {
 109                         dev_dbg(&bus_adap->usb_dev->dev,
 110                         "only wrote %d of %d bytes\n", ret, send_buf_len);
 111                         return -1;
 112                 }
 113         }
 114
 115         if (recv_buf != NULL) {
 116 #ifdef TRACE
 117                 dev_dbg(bus_adap->usb_dev->dev,
 118                         "want to read: %d bytes\n", recv_buf_len);
 119 #endif
 120                 ret = usb_control_msg(bus_adap->usb_dev,
 121                                       usb_rcvctrlpipe(bus_adap->usb_dev, 0),
 122                                       AS102_USB_DEVICE_RX_CTRL_CMD,
 123                                       USB_DIR_IN | USB_TYPE_VENDOR |
 124                                       USB_RECIP_DEVICE,
 125                                       bus_adap->cmd_xid, /* value */
 126                                       0, /* index */
 127                                       recv_buf, recv_buf_len,
 128                                       USB_CTRL_GET_TIMEOUT /* 200 */);
 129                 if (ret < 0) {
 130                         dev_dbg(&bus_adap->usb_dev->dev,
 131                                 "usb_control_msg(recv) failed, err %i\n", ret);
 132                         return ret;
 133                 }
 134 #ifdef TRACE
 135                 dev_dbg(bus_adap->usb_dev->dev,
 136                         "read %d bytes\n", recv_buf_len);
 137 #endif
 138         }
 139
 140         return ret;
 141 }
 142
 143 static int as102_send_ep1(struct as10x_bus_adapter_t *bus_adap,
 144                           unsigned char *send_buf,
 145                           int send_buf_len,
 146                           int swap32)
 147 {
 148         int ret, actual_len;
 149
 150         ret = usb_bulk_msg(bus_adap->usb_dev,
 151                            usb_sndbulkpipe(bus_adap->usb_dev, 1),
 152                            send_buf, send_buf_len, &actual_len, 200);
 153         if (ret) {
 154                 dev_dbg(&bus_adap->usb_dev->dev,
 155                         "usb_bulk_msg(send) failed, err %i\n", ret);
 156                 return ret;
 157         }
 158
 159         if (actual_len != send_buf_len) {
 160                 dev_dbg(&bus_adap->usb_dev->dev, "only wrote %d of %d bytes\n",
 161                         actual_len, send_buf_len);
 162                 return -1;
 163         }
 164         return actual_len;
 165 }
 166
 167 static int as102_read_ep2(struct as10x_bus_adapter_t *bus_adap,
 168                    unsigned char *recv_buf, int recv_buf_len)
 169 {
 170         int ret, actual_len;
 171
 172         if (recv_buf == NULL)
 173                 return -EINVAL;
 174
 175         ret = usb_bulk_msg(bus_adap->usb_dev,
 176                            usb_rcvbulkpipe(bus_adap->usb_dev, 2),
 177                            recv_buf, recv_buf_len, &actual_len, 200);
 178         if (ret) {
 179                 dev_dbg(&bus_adap->usb_dev->dev,
 180                         "usb_bulk_msg(recv) failed, err %i\n", ret);
 181                 return ret;
 182         }
 183
 184         if (actual_len != recv_buf_len) {
 185                 dev_dbg(&bus_adap->usb_dev->dev, "only read %d of %d bytes\n",
 186                         actual_len, recv_buf_len);
 187                 return -1;
 188         }
 189         return actual_len;
 190 }
 191
 192 static struct as102_priv_ops_t as102_priv_ops = {
 193         .upload_fw_pkt  = as102_send_ep1,
 194         .xfer_cmd       = as102_usb_xfer_cmd,
 195         .as102_read_ep2 = as102_read_ep2,
 196         .start_stream   = as102_usb_start_stream,
 197         .stop_stream    = as102_usb_stop_stream,
 198 };
 199
 200 static int as102_submit_urb_stream(struct as102_dev_t *dev, struct urb *urb)
 201 {
 202         int err;
 203
 204         usb_fill_bulk_urb(urb,
 205                           dev->bus_adap.usb_dev,
 206                           usb_rcvbulkpipe(dev->bus_adap.usb_dev, 0x2),
 207                           urb->transfer_buffer,
 208                           AS102_USB_BUF_SIZE,
 209                           as102_urb_stream_irq,
 210                           dev);
 211
 212         err = usb_submit_urb(urb, GFP_ATOMIC);
 213         if (err)
 214                 dev_dbg(&urb->dev->dev,
 215                         "%s: usb_submit_urb failed\n", __func__);
 216
 217         return err;
 218 }
 219
 220 void as102_urb_stream_irq(struct urb *urb)
 221 {
 222         struct as102_dev_t *as102_dev = urb->context;
 223
 224         if (urb->actual_length > 0) {
 225                 dvb_dmx_swfilter(&as102_dev->dvb_dmx,
 226                                  urb->transfer_buffer,
 227                                  urb->actual_length);
 228         } else {
 229                 if (urb->actual_length == 0)
 230                         memset(urb->transfer_buffer, 0, AS102_USB_BUF_SIZE);
 231         }
 232
 233         /* is not stopped, re-submit urb */
 234         if (as102_dev->streaming)
 235                 as102_submit_urb_stream(as102_dev, urb);
 236 }
 237
 238 static void as102_free_usb_stream_buffer(struct as102_dev_t *dev)
 239 {
 240         int i;
 241
 242         for (i = 0; i < MAX_STREAM_URB; i++)
 243                 usb_free_urb(dev->stream_urb[i]);
 244
 245         usb_free_coherent(dev->bus_adap.usb_dev,
 246                         MAX_STREAM_URB * AS102_USB_BUF_SIZE,
 247                         dev->stream,
 248                         dev->dma_addr);
 249 }
 250
 251 static int as102_alloc_usb_stream_buffer(struct as102_dev_t *dev)
 252 {
 253         int i;
 254
 255         dev->stream = usb_alloc_coherent(dev->bus_adap.usb_dev,
 256                                        MAX_STREAM_URB * AS102_USB_BUF_SIZE,
 257                                        GFP_KERNEL,
 258                                        &dev->dma_addr);
 259         if (!dev->stream) {
 260                 dev_dbg(&dev->bus_adap.usb_dev->dev,
 261                         "%s: usb_buffer_alloc failed\n", __func__);
 262                 return -ENOMEM;
 263         }
 264
 265         memset(dev->stream, 0, MAX_STREAM_URB * AS102_USB_BUF_SIZE);
 266
 267         /* init urb buffers */
 268         for (i = 0; i < MAX_STREAM_URB; i++) {
 269                 struct urb *urb;
 270
 271                 urb = usb_alloc_urb(0, GFP_ATOMIC);
 272                 if (urb == NULL) {
 273                         dev_dbg(&dev->bus_adap.usb_dev->dev,
 274                                 "%s: usb_alloc_urb failed\n", __func__);
 275                         as102_free_usb_stream_buffer(dev);
 276                         return -ENOMEM;
 277                 }
 278
 279                 urb->transfer_buffer = dev->stream + (i * AS102_USB_BUF_SIZE);
 280                 urb->transfer_dma = dev->dma_addr + (i * AS102_USB_BUF_SIZE);
 281                 urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 282                 urb->transfer_buffer_length = AS102_USB_BUF_SIZE;
 283
 284                 dev->stream_urb[i] = urb;
 285         }
 286         return 0;
 287 }
 288
 289 static void as102_usb_stop_stream(struct as102_dev_t *dev)
 290 {
 291         int i;
 292
 293         for (i = 0; i < MAX_STREAM_URB; i++)
 294                 usb_kill_urb(dev->stream_urb[i]);
 295 }
 296
 297 static int as102_usb_start_stream(struct as102_dev_t *dev)
 298 {
 299         int i, ret = 0;
 300
 301         for (i = 0; i < MAX_STREAM_URB; i++) {
 302                 ret = as102_submit_urb_stream(dev, dev->stream_urb[i]);
 303                 if (ret) {
 304                         as102_usb_stop_stream(dev);
 305                         return ret;
 306                 }
 307         }
 308
 309         return 0;
 310 }
 311
 312 static void as102_usb_release(struct kref *kref)
 313 {
 314         struct as102_dev_t *as102_dev;
 315
 316         as102_dev = container_of(kref, struct as102_dev_t, kref);
 317         if (as102_dev != NULL) {
 318                 usb_put_dev(as102_dev->bus_adap.usb_dev);
 319                 kfree(as102_dev);
 320         }
 321 }
 322
 323 static void as102_usb_disconnect(struct usb_interface *intf)
 324 {
 325         struct as102_dev_t *as102_dev;
 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         pr_info("%s: device has been disconnected\n", DRIVER_NAME);
 345 }
 346
 347 static int as102_usb_probe(struct usb_interface *intf,
 348                            const struct usb_device_id *id)
 349 {
 350         int ret;
 351         struct as102_dev_t *as102_dev;
 352         int i;
 353
 354         /* This should never actually happen */
 355         if (ARRAY_SIZE(as102_usb_id_table) !=
 356             (sizeof(as102_device_names) / sizeof(const char *))) {
 357                 pr_err("Device names table invalid size");
 358                 return -EINVAL;
 359         }
 360
 361         as102_dev = kzalloc(sizeof(struct as102_dev_t), GFP_KERNEL);
 362         if (as102_dev == NULL)
 363                 return -ENOMEM;
 364
 365         /* Assign the user-friendly device name */
 366         for (i = 0; i < ARRAY_SIZE(as102_usb_id_table); i++) {
 367                 if (id == &as102_usb_id_table[i]) {
 368                         as102_dev->name = as102_device_names[i];
 369                         as102_dev->elna_cfg = as102_elna_cfg[i];
 370                 }
 371         }
 372
 373         if (as102_dev->name == NULL)
 374                 as102_dev->name = "Unknown AS102 device";
 375
 376         /* set private callback functions */
 377         as102_dev->bus_adap.ops = &as102_priv_ops;
 378
 379         /* init cmd token for usb bus */
 380         as102_dev->bus_adap.cmd = &as102_dev->bus_adap.token.usb.c;
 381         as102_dev->bus_adap.rsp = &as102_dev->bus_adap.token.usb.r;
 382
 383         /* init kernel device reference */
 384         kref_init(&as102_dev->kref);
 385
 386         /* store as102 device to usb_device private data */
 387         usb_set_intfdata(intf, (void *) as102_dev);
 388
 389         /* store in as102 device the usb_device pointer */
 390         as102_dev->bus_adap.usb_dev = usb_get_dev(interface_to_usbdev(intf));
 391
 392         /* we can register the device now, as it is ready */
 393         ret = usb_register_dev(intf, &as102_usb_class_driver);
 394         if (ret < 0) {
 395                 /* something prevented us from registering this driver */
 396                 dev_err(&intf->dev,
 397                         "%s: usb_register_dev() failed (errno = %d)\n",
 398                         __func__, ret);
 399                 goto failed;
 400         }
 401
 402         pr_info("%s: device has been detected\n", DRIVER_NAME);
 403
 404         /* request buffer allocation for streaming */
 405         ret = as102_alloc_usb_stream_buffer(as102_dev);
 406         if (ret != 0)
 407                 goto failed_stream;
 408
 409         /* register dvb layer */
 410         ret = as102_dvb_register(as102_dev);
 411         if (ret != 0)
 412                 goto failed_dvb;
 413
 414         return ret;
 415
 416 failed_dvb:
 417         as102_free_usb_stream_buffer(as102_dev);
 418 failed_stream:
 419         usb_deregister_dev(intf, &as102_usb_class_driver);
 420 failed:
 421         usb_put_dev(as102_dev->bus_adap.usb_dev);
 422         usb_set_intfdata(intf, NULL);
 423         kfree(as102_dev);
 424         return ret;
 425 }
 426
 427 static int as102_open(struct inode *inode, struct file *file)
 428 {
 429         int ret = 0, minor = 0;
 430         struct usb_interface *intf = NULL;
 431         struct as102_dev_t *dev = NULL;
 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                 pr_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         return ret;
 460 }
 461
 462 static int as102_release(struct inode *inode, struct file *file)
 463 {
 464         struct as102_dev_t *dev = NULL;
 465
 466         dev = file->private_data;
 467         if (dev != NULL) {
 468                 /* decrement the count on our device */
 469                 kref_put(&dev->kref, as102_usb_release);
 470         }
 471
 472         return 0;
 473 }
 474
 475 MODULE_DEVICE_TABLE(usb, as102_usb_id_table);