kernel/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. (Try to) detect if we must register ac97 mixer
  24  * 2. Support stream at lower speed: lower frame rate or lower frame size.
  25  *
  26  */
  27
  28 #include <linux/module.h>
  29 #include <linux/init.h>
  30 #include <linux/kernel.h>
  31 #include <linux/errno.h>
  32 #include <linux/slab.h>
  33
  34 #include <linux/usb.h>
  35 #include <linux/mm.h>
  36 #include <linux/vmalloc.h>
  37 #include <media/saa7115.h>
  38
  39 #include "stk1160.h"
  40 #include "stk1160-reg.h"
  41
  42 static unsigned int input;
  43 module_param(input, int, 0644);
  44 MODULE_PARM_DESC(input, "Set default input");
  45
  46 MODULE_LICENSE("GPL");
  47 MODULE_AUTHOR("Ezequiel Garcia");
  48 MODULE_DESCRIPTION("STK1160 driver");
  49
  50 /* Devices supported by this driver */
  51 static struct usb_device_id stk1160_id_table[] = {
  52         { USB_DEVICE(0x05e1, 0x0408) },
  53         { }
  54 };
  55 MODULE_DEVICE_TABLE(usb, stk1160_id_table);
  56
  57 /* saa7113 I2C address */
  58 static unsigned short saa7113_addrs[] = {
  59         0x4a >> 1,
  60         I2C_CLIENT_END
  61 };
  62
  63 /*
  64  * Read/Write stk registers
  65  */
  66 int stk1160_read_reg(struct stk1160 *dev, u16 reg, u8 *value)
  67 {
  68         int ret;
  69         int pipe = usb_rcvctrlpipe(dev->udev, 0);
  70         u8 *buf;
  71
  72         *value = 0;
  73
  74         buf = kmalloc(sizeof(u8), GFP_KERNEL);
  75         if (!buf)
  76                 return -ENOMEM;
  77         ret = usb_control_msg(dev->udev, pipe, 0x00,
  78                         USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  79                         0x00, reg, buf, sizeof(u8), HZ);
  80         if (ret < 0) {
  81                 stk1160_err("read failed on reg 0x%x (%d)\n",
  82                         reg, ret);
  83                 kfree(buf);
  84                 return ret;
  85         }
  86
  87         *value = *buf;
  88         kfree(buf);
  89         return 0;
  90 }
  91
  92 int stk1160_write_reg(struct stk1160 *dev, u16 reg, u16 value)
  93 {
  94         int ret;
  95         int pipe = usb_sndctrlpipe(dev->udev, 0);
  96
  97         ret =  usb_control_msg(dev->udev, pipe, 0x01,
  98                         USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  99                         value, reg, NULL, 0, HZ);
 100         if (ret < 0) {
 101                 stk1160_err("write failed on reg 0x%x (%d)\n",
 102                         reg, ret);
 103                 return ret;
 104         }
 105
 106         return 0;
 107 }
 108
 109 void stk1160_select_input(struct stk1160 *dev)
 110 {
 111         int route;
 112         static const u8 gctrl[] = {
 113                 0x98, 0x90, 0x88, 0x80, 0x98
 114         };
 115
 116         if (dev->ctl_input == STK1160_SVIDEO_INPUT)
 117                 route = SAA7115_SVIDEO3;
 118         else
 119                 route = SAA7115_COMPOSITE0;
 120
 121         if (dev->ctl_input < ARRAY_SIZE(gctrl)) {
 122                 v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_routing,
 123                                 route, 0, 0);
 124                 stk1160_write_reg(dev, STK1160_GCTRL, gctrl[dev->ctl_input]);
 125         }
 126 }
 127
 128 /* TODO: We should break this into pieces */
 129 static void stk1160_reg_reset(struct stk1160 *dev)
 130 {
 131         int i;
 132
 133         static const struct regval ctl[] = {
 134                 {STK1160_GCTRL+2, 0x0078},
 135
 136                 {STK1160_RMCTL+1, 0x0000},
 137                 {STK1160_RMCTL+3, 0x0002},
 138
 139                 {STK1160_PLLSO,   0x0010},
 140                 {STK1160_PLLSO+1, 0x0000},
 141                 {STK1160_PLLSO+2, 0x0014},
 142                 {STK1160_PLLSO+3, 0x000E},
 143
 144                 {STK1160_PLLFD,   0x0046},
 145
 146                 /* Timing generator setup */
 147                 {STK1160_TIGEN,   0x0012},
 148                 {STK1160_TICTL,   0x002D},
 149                 {STK1160_TICTL+1, 0x0001},
 150                 {STK1160_TICTL+2, 0x0000},
 151                 {STK1160_TICTL+3, 0x0000},
 152                 {STK1160_TIGEN,   0x0080},
 153
 154                 {0xffff, 0xffff}
 155         };
 156
 157         for (i = 0; ctl[i].reg != 0xffff; i++)
 158                 stk1160_write_reg(dev, ctl[i].reg, ctl[i].val);
 159 }
 160
 161 static void stk1160_release(struct v4l2_device *v4l2_dev)
 162 {
 163         struct stk1160 *dev = container_of(v4l2_dev, struct stk1160, v4l2_dev);
 164
 165         stk1160_info("releasing all resources\n");
 166
 167         stk1160_i2c_unregister(dev);
 168
 169         v4l2_ctrl_handler_free(&dev->ctrl_handler);
 170         v4l2_device_unregister(&dev->v4l2_dev);
 171         kfree(dev->alt_max_pkt_size);
 172         kfree(dev);
 173 }
 174
 175 /* high bandwidth multiplier, as encoded in highspeed endpoint descriptors */
 176 #define hb_mult(wMaxPacketSize) (1 + (((wMaxPacketSize) >> 11) & 0x03))
 177
 178 /*
 179  * Scan usb interface and populate max_pkt_size array
 180  * with information on each alternate setting.
 181  * The array should be allocated by the caller.
 182  */
 183 static int stk1160_scan_usb(struct usb_interface *intf, struct usb_device *udev,
 184                 unsigned int *max_pkt_size)
 185 {
 186         int i, e, sizedescr, size, ifnum;
 187         const struct usb_endpoint_descriptor *desc;
 188
 189         bool has_video = false, has_audio = false;
 190         const char *speed;
 191
 192         ifnum = intf->altsetting[0].desc.bInterfaceNumber;
 193
 194         /* Get endpoints */
 195         for (i = 0; i < intf->num_altsetting; i++) {
 196
 197                 for (e = 0; e < intf->altsetting[i].desc.bNumEndpoints; e++) {
 198
 199                         /* This isn't clear enough, at least to me */
 200                         desc = &intf->altsetting[i].endpoint[e].desc;
 201                         sizedescr = le16_to_cpu(desc->wMaxPacketSize);
 202                         size = sizedescr & 0x7ff;
 203
 204                         if (udev->speed == USB_SPEED_HIGH)
 205                                 size = size * hb_mult(sizedescr);
 206
 207                         if (usb_endpoint_xfer_isoc(desc) &&
 208                             usb_endpoint_dir_in(desc)) {
 209                                 switch (desc->bEndpointAddress) {
 210                                 case STK1160_EP_AUDIO:
 211                                         has_audio = true;
 212                                         break;
 213                                 case STK1160_EP_VIDEO:
 214                                         has_video = true;
 215                                         max_pkt_size[i] = size;
 216                                         break;
 217                                 }
 218                         }
 219                 }
 220         }
 221
 222         /* Is this even possible? */
 223         if (!(has_audio || has_video)) {
 224                 dev_err(&udev->dev, "no audio or video endpoints found\n");
 225                 return -ENODEV;
 226         }
 227
 228         switch (udev->speed) {
 229         case USB_SPEED_LOW:
 230                 speed = "1.5";
 231                 break;
 232         case USB_SPEED_FULL:
 233                 speed = "12";
 234                 break;
 235         case USB_SPEED_HIGH:
 236                 speed = "480";
 237                 break;
 238         default:
 239                 speed = "unknown";
 240         }
 241
 242         dev_info(&udev->dev, "New device %s %s @ %s Mbps (%04x:%04x, interface %d, class %d)\n",
 243                 udev->manufacturer ? udev->manufacturer : "",
 244                 udev->product ? udev->product : "",
 245                 speed,
 246                 le16_to_cpu(udev->descriptor.idVendor),
 247                 le16_to_cpu(udev->descriptor.idProduct),
 248                 ifnum,
 249                 intf->altsetting->desc.bInterfaceNumber);
 250
 251         /* This should never happen, since we rejected audio interfaces */
 252         if (has_audio)
 253                 dev_warn(&udev->dev, "audio interface %d found.\n\
 254                                 This is not implemented by this driver,\
 255                                 you should use snd-usb-audio instead\n", ifnum);
 256
 257         if (has_video)
 258                 dev_info(&udev->dev, "video interface %d found\n",
 259                                 ifnum);
 260
 261         /*
 262          * Make sure we have 480 Mbps of bandwidth, otherwise things like
 263          * video stream wouldn't likely work, since 12 Mbps is generally
 264          * not enough even for most streams.
 265          */
 266         if (udev->speed != USB_SPEED_HIGH)
 267                 dev_warn(&udev->dev, "must be connected to a high-speed USB 2.0 port\n\
 268                                 You may not be able to stream video smoothly\n");
 269
 270         return 0;
 271 }
 272
 273 static int stk1160_probe(struct usb_interface *interface,
 274                 const struct usb_device_id *id)
 275 {
 276         int rc = 0;
 277
 278         unsigned int *alt_max_pkt_size; /* array of wMaxPacketSize */
 279         struct usb_device *udev;
 280         struct stk1160 *dev;
 281
 282         udev = interface_to_usbdev(interface);
 283
 284         /*
 285          * Since usb audio class is supported by snd-usb-audio,
 286          * we reject audio interface.
 287          */
 288         if (interface->altsetting[0].desc.bInterfaceClass == USB_CLASS_AUDIO)
 289                 return -ENODEV;
 290
 291         /* Alloc an array for all possible max_pkt_size */
 292         alt_max_pkt_size = kmalloc(sizeof(alt_max_pkt_size[0]) *
 293                         interface->num_altsetting, GFP_KERNEL);
 294         if (alt_max_pkt_size == NULL)
 295                 return -ENOMEM;
 296
 297         /*
 298          * Scan usb posibilities and populate alt_max_pkt_size array.
 299          * Also, check if device speed is fast enough.
 300          */
 301         rc = stk1160_scan_usb(interface, udev, alt_max_pkt_size);
 302         if (rc < 0) {
 303                 kfree(alt_max_pkt_size);
 304                 return rc;
 305         }
 306
 307         dev = kzalloc(sizeof(struct stk1160), GFP_KERNEL);
 308         if (dev == NULL) {
 309                 kfree(alt_max_pkt_size);
 310                 return -ENOMEM;
 311         }
 312
 313         dev->alt_max_pkt_size = alt_max_pkt_size;
 314         dev->udev = udev;
 315         dev->num_alt = interface->num_altsetting;
 316         dev->ctl_input = input;
 317
 318         /* We save struct device for debug purposes only */
 319         dev->dev = &interface->dev;
 320
 321         usb_set_intfdata(interface, dev);
 322
 323         /* initialize videobuf2 stuff */
 324         rc = stk1160_vb2_setup(dev);
 325         if (rc < 0)
 326                 goto free_err;
 327
 328         /*
 329          * There is no need to take any locks here in probe
 330          * because we register the device node as the *last* thing.
 331          */
 332         spin_lock_init(&dev->buf_lock);
 333         mutex_init(&dev->v4l_lock);
 334         mutex_init(&dev->vb_queue_lock);
 335
 336         rc = v4l2_ctrl_handler_init(&dev->ctrl_handler, 0);
 337         if (rc) {
 338                 stk1160_err("v4l2_ctrl_handler_init failed (%d)\n", rc);
 339                 goto free_err;
 340         }
 341
 342         /*
 343          * We obtain a v4l2_dev but defer
 344          * registration of video device node as the last thing.
 345          * There is no need to set the name if we give a device struct
 346          */
 347         dev->v4l2_dev.release = stk1160_release;
 348         dev->v4l2_dev.ctrl_handler = &dev->ctrl_handler;
 349         rc = v4l2_device_register(dev->dev, &dev->v4l2_dev);
 350         if (rc) {
 351                 stk1160_err("v4l2_device_register failed (%d)\n", rc);
 352                 goto free_ctrl;
 353         }
 354
 355         rc = stk1160_i2c_register(dev);
 356         if (rc < 0)
 357                 goto unreg_v4l2;
 358
 359         /*
 360          * To the best of my knowledge stk1160 boards only have
 361          * saa7113, but it doesn't hurt to support them all.
 362          */
 363         dev->sd_saa7115 = v4l2_i2c_new_subdev(&dev->v4l2_dev, &dev->i2c_adap,
 364                 "saa7115_auto", 0, saa7113_addrs);
 365
 366         stk1160_info("driver ver %s successfully loaded\n",
 367                 STK1160_VERSION);
 368
 369         /* i2c reset saa711x */
 370         v4l2_device_call_all(&dev->v4l2_dev, 0, core, reset, 0);
 371         v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 0);
 372
 373         /* reset stk1160 to default values */
 374         stk1160_reg_reset(dev);
 375
 376         /* select default input */
 377         stk1160_select_input(dev);
 378
 379         stk1160_ac97_register(dev);
 380
 381         rc = stk1160_video_register(dev);
 382         if (rc < 0)
 383                 goto unreg_i2c;
 384
 385         return 0;
 386
 387 unreg_i2c:
 388         stk1160_i2c_unregister(dev);
 389 unreg_v4l2:
 390         v4l2_device_unregister(&dev->v4l2_dev);
 391 free_ctrl:
 392         v4l2_ctrl_handler_free(&dev->ctrl_handler);
 393 free_err:
 394         kfree(alt_max_pkt_size);
 395         kfree(dev);
 396
 397         return rc;
 398 }
 399
 400 static void stk1160_disconnect(struct usb_interface *interface)
 401 {
 402         struct stk1160 *dev;
 403
 404         dev = usb_get_intfdata(interface);
 405         usb_set_intfdata(interface, NULL);
 406
 407         /*
 408          * Wait until all current v4l2 operation are finished
 409          * then deallocate resources
 410          */
 411         mutex_lock(&dev->vb_queue_lock);
 412         mutex_lock(&dev->v4l_lock);
 413
 414         /* Here is the only place where isoc get released */
 415         stk1160_uninit_isoc(dev);
 416
 417         /* ac97 unregister needs to be done before usb_device is cleared */
 418         stk1160_ac97_unregister(dev);
 419
 420         stk1160_clear_queue(dev);
 421
 422         video_unregister_device(&dev->vdev);
 423         v4l2_device_disconnect(&dev->v4l2_dev);
 424
 425         /* This way current users can detect device is gone */
 426         dev->udev = NULL;
 427
 428         mutex_unlock(&dev->v4l_lock);
 429         mutex_unlock(&dev->vb_queue_lock);
 430
 431         /*
 432          * This calls stk1160_release if it's the last reference.
 433          * therwise, release is posponed until there are no users left.
 434          */
 435         v4l2_device_put(&dev->v4l2_dev);
 436 }
 437
 438 static struct usb_driver stk1160_usb_driver = {
 439         .name = "stk1160",
 440         .id_table = stk1160_id_table,
 441         .probe = stk1160_probe,
 442         .disconnect = stk1160_disconnect,
 443 };
 444
 445 module_usb_driver(stk1160_usb_driver);