drivers/media/usb/stk1160/stk1160-core.c

   1 /*
   2  * STK1160 driver
   3  *
   4  * Copyright (C) 2012 Ezequiel Garcia
   5  * <elezegarcia--a.t--gmail.com>
   6  *
   7  * Based on Easycap driver by R.M. Thomas
   8  *      Copyright (C) 2010 R.M. Thomas
   9  *      <rmthomas--a.t--sciolus.org>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * TODO:
  22  *
  23  * 1. Support stream at lower speed: lower frame rate or lower frame size.
  24  *
  25  */
  26
  27 #include <linux/module.h>
  28 #include <linux/init.h>
  29 #include <linux/kernel.h>
  30 #include <linux/errno.h>
  31 #include <linux/slab.h>
  32
  33 #include <linux/usb.h>
  34 #include <linux/mm.h>
  35 #include <linux/vmalloc.h>
  36 #include <media/i2c/saa7115.h>
  37
  38 #include "stk1160.h"
  39 #include "stk1160-reg.h"
  40
  41 static unsigned int input;
  42 module_param(input, int, 0644);
  43 MODULE_PARM_DESC(input, "Set default input");
  44
  45 MODULE_LICENSE("GPL");
  46 MODULE_AUTHOR("Ezequiel Garcia");
  47 MODULE_DESCRIPTION("STK1160 driver");
  48
  49 /* Devices supported by this driver */
  50 static const struct usb_device_id stk1160_id_table[] = {
  51         { USB_DEVICE(0x05e1, 0x0408) },
  52         { }
  53 };
  54 MODULE_DEVICE_TABLE(usb, stk1160_id_table);
  55
  56 /* saa7113 I2C address */
  57 static unsigned short saa7113_addrs[] = {
  58         0x4a >> 1,
  59         I2C_CLIENT_END
  60 };
  61
  62 /*
  63  * Read/Write stk registers
  64  */
  65 int stk1160_read_reg(struct stk1160 *dev, u16 reg, u8 *value)
  66 {
  67         int ret;
  68         int pipe = usb_rcvctrlpipe(dev->udev, 0);
  69         u8 *buf;
  70
  71         *value = 0;
  72
  73         buf = kmalloc(sizeof(u8), GFP_KERNEL);
  74         if (!buf)
  75                 return -ENOMEM;
  76         ret = usb_control_msg(dev->udev, pipe, 0x00,
  77                         USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  78                         0x00, reg, buf, sizeof(u8), HZ);
  79         if (ret < 0) {
  80                 stk1160_err("read failed on reg 0x%x (%d)\n",
  81                         reg, ret);
  82                 kfree(buf);
  83                 return ret;
  84         }
  85
  86         *value = *buf;
  87         kfree(buf);
  88         return 0;
  89 }
  90
  91 int stk1160_write_reg(struct stk1160 *dev, u16 reg, u16 value)
  92 {
  93         int ret;
  94         int pipe = usb_sndctrlpipe(dev->udev, 0);
  95
  96         ret =  usb_control_msg(dev->udev, pipe, 0x01,
  97                         USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  98                         value, reg, NULL, 0, HZ);
  99         if (ret < 0) {
 100                 stk1160_err("write failed on reg 0x%x (%d)\n",
 101                         reg, ret);
 102                 return ret;
 103         }
 104
 105         return 0;
 106 }
 107
 108 void stk1160_select_input(struct stk1160 *dev)
 109 {
 110         int route;
 111         static const u8 gctrl[] = {
 112                 0x98, 0x90, 0x88, 0x80, 0x98
 113         };
 114
 115         if (dev->ctl_input == STK1160_SVIDEO_INPUT)
 116                 route = SAA7115_SVIDEO3;
 117         else
 118                 route = SAA7115_COMPOSITE0;
 119
 120         if (dev->ctl_input < ARRAY_SIZE(gctrl)) {
 121                 v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_routing,
 122                                 route, 0, 0);
 123                 stk1160_write_reg(dev, STK1160_GCTRL, gctrl[dev->ctl_input]);
 124         }
 125 }
 126
 127 /* TODO: We should break this into pieces */
 128 static void stk1160_reg_reset(struct stk1160 *dev)
 129 {
 130         int i;
 131
 132         static const struct regval ctl[] = {
 133                 {STK1160_GCTRL+2, 0x0078},
 134
 135                 {STK1160_RMCTL+1, 0x0000},
 136                 {STK1160_RMCTL+3, 0x0002},
 137
 138                 {STK1160_PLLSO,   0x0010},
 139                 {STK1160_PLLSO+1, 0x0000},
 140                 {STK1160_PLLSO+2, 0x0014},
 141                 {STK1160_PLLSO+3, 0x000E},
 142
 143                 {STK1160_PLLFD,   0x0046},
 144
 145                 /* Timing generator setup */
 146                 {STK1160_TIGEN,   0x0012},
 147                 {STK1160_TICTL,   0x002D},
 148                 {STK1160_TICTL+1, 0x0001},
 149                 {STK1160_TICTL+2, 0x0000},
 150                 {STK1160_TICTL+3, 0x0000},
 151                 {STK1160_TIGEN,   0x0080},
 152
 153                 {0xffff, 0xffff}
 154         };
 155
 156         for (i = 0; ctl[i].reg != 0xffff; i++)
 157                 stk1160_write_reg(dev, ctl[i].reg, ctl[i].val);
 158 }
 159
 160 static void stk1160_release(struct v4l2_device *v4l2_dev)
 161 {
 162         struct stk1160 *dev = container_of(v4l2_dev, struct stk1160, v4l2_dev);
 163
 164         stk1160_dbg("releasing all resources\n");
 165
 166         stk1160_i2c_unregister(dev);
 167
 168         v4l2_ctrl_handler_free(&dev->ctrl_handler);
 169         v4l2_device_unregister(&dev->v4l2_dev);
 170         mutex_destroy(&dev->v4l_lock);
 171         mutex_destroy(&dev->vb_queue_lock);
 172         kfree(dev->alt_max_pkt_size);
 173         kfree(dev);
 174 }
 175
 176 /* high bandwidth multiplier, as encoded in highspeed endpoint descriptors */
 177 #define hb_mult(wMaxPacketSize) (1 + (((wMaxPacketSize) >> 11) & 0x03))
 178
 179 /*
 180  * Scan usb interface and populate max_pkt_size array
 181  * with information on each alternate setting.
 182  * The array should be allocated by the caller.
 183  */
 184 static int stk1160_scan_usb(struct usb_interface *intf, struct usb_device *udev,
 185                 unsigned int *max_pkt_size)
 186 {
 187         int i, e, sizedescr, size, ifnum;
 188         const struct usb_endpoint_descriptor *desc;
 189
 190         bool has_video = false, has_audio = false;
 191         const char *speed;
 192
 193         ifnum = intf->altsetting[0].desc.bInterfaceNumber;
 194
 195         /* Get endpoints */
 196         for (i = 0; i < intf->num_altsetting; i++) {
 197
 198                 for (e = 0; e < intf->altsetting[i].desc.bNumEndpoints; e++) {
 199
 200                         /* This isn't clear enough, at least to me */
 201                         desc = &intf->altsetting[i].endpoint[e].desc;
 202                         sizedescr = le16_to_cpu(desc->wMaxPacketSize);
 203                         size = sizedescr & 0x7ff;
 204
 205                         if (udev->speed == USB_SPEED_HIGH)
 206                                 size = size * hb_mult(sizedescr);
 207
 208                         if (usb_endpoint_xfer_isoc(desc) &&
 209                             usb_endpoint_dir_in(desc)) {
 210                                 switch (desc->bEndpointAddress) {
 211                                 case STK1160_EP_AUDIO:
 212                                         has_audio = true;
 213                                         break;
 214                                 case STK1160_EP_VIDEO:
 215                                         has_video = true;
 216                                         max_pkt_size[i] = size;
 217                                         break;
 218                                 }
 219                         }
 220                 }
 221         }
 222
 223         /* Is this even possible? */
 224         if (!(has_audio || has_video)) {
 225                 dev_err(&udev->dev, "no audio or video endpoints found\n");
 226                 return -ENODEV;
 227         }
 228
 229         switch (udev->speed) {
 230         case USB_SPEED_LOW:
 231                 speed = "1.5";
 232                 break;
 233         case USB_SPEED_FULL:
 234                 speed = "12";
 235                 break;
 236         case USB_SPEED_HIGH:
 237                 speed = "480";
 238                 break;
 239         default:
 240                 speed = "unknown";
 241         }
 242
 243         dev_info(&udev->dev, "New device %s %s @ %s Mbps (%04x:%04x, interface %d, class %d)\n",
 244                 udev->manufacturer ? udev->manufacturer : "",
 245                 udev->product ? udev->product : "",
 246                 speed,
 247                 le16_to_cpu(udev->descriptor.idVendor),
 248                 le16_to_cpu(udev->descriptor.idProduct),
 249                 ifnum,
 250                 intf->altsetting->desc.bInterfaceNumber);
 251
 252         /* This should never happen, since we rejected audio interfaces */
 253         if (has_audio)
 254                 dev_warn(&udev->dev, "audio interface %d found.\n\
 255                                 This is not implemented by this driver,\
 256                                 you should use snd-usb-audio instead\n", ifnum);
 257
 258         if (has_video)
 259                 dev_info(&udev->dev, "video interface %d found\n",
 260                                 ifnum);
 261
 262         /*
 263          * Make sure we have 480 Mbps of bandwidth, otherwise things like
 264          * video stream wouldn't likely work, since 12 Mbps is generally
 265          * not enough even for most streams.
 266          */
 267         if (udev->speed != USB_SPEED_HIGH)
 268                 dev_warn(&udev->dev, "must be connected to a high-speed USB 2.0 port\n\
 269                                 You may not be able to stream video smoothly\n");
 270
 271         return 0;
 272 }
 273
 274 static int stk1160_probe(struct usb_interface *interface,
 275                 const struct usb_device_id *id)
 276 {
 277         int rc = 0;
 278
 279         unsigned int *alt_max_pkt_size; /* array of wMaxPacketSize */
 280         struct usb_device *udev;
 281         struct stk1160 *dev;
 282
 283         udev = interface_to_usbdev(interface);
 284
 285         /*
 286          * Since usb audio class is supported by snd-usb-audio,
 287          * we reject audio interface.
 288          */
 289         if (interface->altsetting[0].desc.bInterfaceClass == USB_CLASS_AUDIO)
 290                 return -ENODEV;
 291
 292         /* Alloc an array for all possible max_pkt_size */
 293         alt_max_pkt_size = kmalloc_array(interface->num_altsetting,
 294                                          sizeof(alt_max_pkt_size[0]),
 295                                          GFP_KERNEL);
 296         if (alt_max_pkt_size == NULL)
 297                 return -ENOMEM;
 298
 299         /*
 300          * Scan usb possibilities and populate alt_max_pkt_size array.
 301          * Also, check if device speed is fast enough.
 302          */
 303         rc = stk1160_scan_usb(interface, udev, alt_max_pkt_size);
 304         if (rc < 0) {
 305                 kfree(alt_max_pkt_size);
 306                 return rc;
 307         }
 308
 309         dev = kzalloc(sizeof(struct stk1160), GFP_KERNEL);
 310         if (dev == NULL) {
 311                 kfree(alt_max_pkt_size);
 312                 return -ENOMEM;
 313         }
 314
 315         dev->alt_max_pkt_size = alt_max_pkt_size;
 316         dev->udev = udev;
 317         dev->num_alt = interface->num_altsetting;
 318         dev->ctl_input = input;
 319
 320         /* We save struct device for debug purposes only */
 321         dev->dev = &interface->dev;
 322
 323         usb_set_intfdata(interface, dev);
 324
 325         /* initialize videobuf2 stuff */
 326         rc = stk1160_vb2_setup(dev);
 327         if (rc < 0)
 328                 goto free_err;
 329
 330         /*
 331          * There is no need to take any locks here in probe
 332          * because we register the device node as the *last* thing.
 333          */
 334         spin_lock_init(&dev->buf_lock);
 335         mutex_init(&dev->v4l_lock);
 336         mutex_init(&dev->vb_queue_lock);
 337
 338         rc = v4l2_ctrl_handler_init(&dev->ctrl_handler, 0);
 339         if (rc) {
 340                 stk1160_err("v4l2_ctrl_handler_init failed (%d)\n", rc);
 341                 goto free_err;
 342         }
 343
 344         /*
 345          * We obtain a v4l2_dev but defer
 346          * registration of video device node as the last thing.
 347          * There is no need to set the name if we give a device struct
 348          */
 349         dev->v4l2_dev.release = stk1160_release;
 350         dev->v4l2_dev.ctrl_handler = &dev->ctrl_handler;
 351         rc = v4l2_device_register(dev->dev, &dev->v4l2_dev);
 352         if (rc) {
 353                 stk1160_err("v4l2_device_register failed (%d)\n", rc);
 354                 goto free_ctrl;
 355         }
 356
 357         rc = stk1160_i2c_register(dev);
 358         if (rc < 0)
 359                 goto unreg_v4l2;
 360
 361         /*
 362          * To the best of my knowledge stk1160 boards only have
 363          * saa7113, but it doesn't hurt to support them all.
 364          */
 365         dev->sd_saa7115 = v4l2_i2c_new_subdev(&dev->v4l2_dev, &dev->i2c_adap,
 366                 "saa7115_auto", 0, saa7113_addrs);
 367
 368         /* i2c reset saa711x */
 369         v4l2_device_call_all(&dev->v4l2_dev, 0, core, reset, 0);
 370         v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 0);
 371
 372         /* reset stk1160 to default values */
 373         stk1160_reg_reset(dev);
 374
 375         /* select default input */
 376         stk1160_select_input(dev);
 377
 378         stk1160_ac97_setup(dev);
 379
 380         rc = stk1160_video_register(dev);
 381         if (rc < 0)
 382                 goto unreg_i2c;
 383
 384         return 0;
 385
 386 unreg_i2c:
 387         stk1160_i2c_unregister(dev);
 388 unreg_v4l2:
 389         v4l2_device_unregister(&dev->v4l2_dev);
 390 free_ctrl:
 391         v4l2_ctrl_handler_free(&dev->ctrl_handler);
 392 free_err:
 393         kfree(alt_max_pkt_size);
 394         kfree(dev);
 395
 396         return rc;
 397 }
 398
 399 static void stk1160_disconnect(struct usb_interface *interface)
 400 {
 401         struct stk1160 *dev;
 402
 403         dev = usb_get_intfdata(interface);
 404         usb_set_intfdata(interface, NULL);
 405
 406         /*
 407          * Wait until all current v4l2 operation are finished
 408          * then deallocate resources
 409          */
 410         mutex_lock(&dev->vb_queue_lock);
 411         mutex_lock(&dev->v4l_lock);
 412
 413         /* Here is the only place where isoc get released */
 414         stk1160_uninit_isoc(dev);
 415
 416         stk1160_clear_queue(dev);
 417
 418         video_unregister_device(&dev->vdev);
 419         v4l2_device_disconnect(&dev->v4l2_dev);
 420
 421         /* This way current users can detect device is gone */
 422         dev->udev = NULL;
 423
 424         mutex_unlock(&dev->v4l_lock);
 425         mutex_unlock(&dev->vb_queue_lock);
 426
 427         /*
 428          * This calls stk1160_release if it's the last reference.
 429          * Otherwise, release is postponed until there are no users left.
 430          */
 431         v4l2_device_put(&dev->v4l2_dev);
 432 }
 433
 434 static struct usb_driver stk1160_usb_driver = {
 435         .name = "stk1160",
 436         .id_table = stk1160_id_table,
 437         .probe = stk1160_probe,
 438         .disconnect = stk1160_disconnect,
 439 };
 440
 441 module_usb_driver(stk1160_usb_driver);