git.oblomov.eu Git - linux-2.6/blob - drivers/media/video/em28xx/em28xx-dvb.c

   1 /*
   2  DVB device driver for em28xx
   3
   4  (c) 2008 Mauro Carvalho Chehab <mchehab@infradead.org>
   5
   6  Based on cx88-dvb and saa7134-dvb originally written by:
   7         (c) 2004, 2005 Chris Pascoe <c.pascoe@itee.uq.edu.au>
   8         (c) 2004 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
   9
  10  This program is free software; you can redistribute it and/or modify
  11  it under the terms of the GNU General Public License as published by
  12  the Free Software Foundation; either version 2 of the License.
  13  */
  14
  15 #include <linux/kernel.h>
  16 #include <linux/usb.h>
  17
  18 #include "em28xx.h"
  19 #include <media/v4l2-common.h>
  20 #include <media/videobuf-vmalloc.h>
  21
  22 #include "lgdt330x.h"
  23
  24 MODULE_DESCRIPTION("driver for em28xx based DVB cards");
  25 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
  26 MODULE_LICENSE("GPL");
  27
  28 static unsigned int debug;
  29 module_param(debug, int, 0644);
  30 MODULE_PARM_DESC(debug, "enable debug messages [dvb]");
  31
  32 DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr);
  33
  34 #define dprintk(level, fmt, arg...) do {                        \
  35 if (debug >= level)                                             \
  36         printk(KERN_DEBUG "%s/2-dvb: " fmt, dev->name, ## arg)  \
  37 } while (0)
  38
  39 static int
  40 buffer_setup(struct videobuf_queue *vq, unsigned int *count, unsigned int *size)
  41 {
  42         struct em28xx_fh *fh = vq->priv_data;
  43         struct em28xx        *dev = fh->dev;
  44
  45         *size = 16 * fh->dev->width * fh->dev->height >> 3;
  46         if (0 == *count)
  47                 *count = EM28XX_DEF_BUF;
  48
  49         if (*count < EM28XX_MIN_BUF)
  50                 *count = EM28XX_MIN_BUF;
  51
  52         dev->mode = EM28XX_DIGITAL_MODE;
  53
  54         return 0;
  55 }
  56
  57 /* ------------------------------------------------------------------ */
  58
  59 static struct lgdt330x_config em2880_lgdt3303_dev = {
  60         .demod_address = 0x0e,
  61         .demod_chip = LGDT3303,
  62 };
  63
  64 /* ------------------------------------------------------------------ */
  65
  66 static int attach_xc3028(u8 addr, struct em28xx *dev)
  67 {
  68         struct dvb_frontend *fe;
  69         struct xc2028_ctrl ctl;
  70         struct xc2028_config cfg;
  71
  72         memset (&cfg, 0, sizeof(cfg));
  73         cfg.i2c_adap  = &dev->i2c_adap;
  74         cfg.i2c_addr  = addr;
  75         cfg.ctrl      = &ctl;
  76         cfg.callback  = em28xx_tuner_callback;
  77
  78         em28xx_setup_xc3028(dev, &ctl);
  79
  80         if (!dev->dvb.frontend) {
  81                 printk(KERN_ERR "%s/2: dvb frontend not attached. "
  82                                 "Can't attach xc3028\n",
  83                        dev->name);
  84                 return -EINVAL;
  85         }
  86
  87         fe = dvb_attach(xc2028_attach, dev->dvb.frontend, &cfg);
  88         if (!fe) {
  89                 printk(KERN_ERR "%s/2: xc3028 attach failed\n",
  90                        dev->name);
  91                 dvb_frontend_detach(dev->dvb.frontend);
  92                 dvb_unregister_frontend(dev->dvb.frontend);
  93                 dev->dvb.frontend = NULL;
  94                 return -EINVAL;
  95         }
  96
  97         printk(KERN_INFO "%s/2: xc3028 attached\n", dev->name);
  98
  99         return 0;
 100 }
 101
 102 static int dvb_init(struct em28xx *dev)
 103 {
 104         /* init struct videobuf_dvb */
 105         dev->dvb.name = dev->name;
 106
 107         dev->qops->buf_setup = buffer_setup;
 108
 109         videobuf_queue_vmalloc_init(&dev->dvb.dvbq, dev->qops,
 110                         &dev->udev->dev, &dev->slock,
 111                         V4L2_BUF_TYPE_VIDEO_CAPTURE,
 112                         V4L2_FIELD_ALTERNATE,
 113                         sizeof(struct em28xx_buffer), dev);
 114
 115         /* init frontend */
 116         switch (dev->model) {
 117         case EM2880_BOARD_HAUPPAUGE_WINTV_HVR_950:
 118                 /* Enable lgdt330x */
 119                 dev->mode = EM28XX_ANALOG_MODE;
 120                 em28xx_tuner_callback(dev, XC2028_TUNER_RESET, 0);
 121
 122                 dev->dvb.frontend = dvb_attach(lgdt330x_attach,
 123                                                &em2880_lgdt3303_dev,
 124                                                &dev->i2c_adap);
 125                 if (attach_xc3028(0x61, dev) < 0)
 126                         return -EINVAL;
 127                 break;
 128         default:
 129                 printk(KERN_ERR "%s/2: The frontend of your DVB/ATSC card"
 130                                 " isn't supported yet\n",
 131                        dev->name);
 132                 break;
 133         }
 134         if (NULL == dev->dvb.frontend) {
 135                 printk(KERN_ERR
 136                        "%s/2: frontend initialization failed\n",
 137                        dev->name);
 138                 return -EINVAL;
 139         }
 140
 141         /* register everything */
 142         return videobuf_dvb_register(&dev->dvb, THIS_MODULE, dev,
 143                                      &dev->udev->dev,
 144                                      adapter_nr);
 145 }
 146
 147 static int dvb_fini(struct em28xx *dev)
 148 {
 149         if (dev->dvb.frontend)
 150                 videobuf_dvb_unregister(&dev->dvb);
 151
 152         return 0;
 153 }
 154
 155 static struct em28xx_ops dvb_ops = {
 156         .id   = EM28XX_DVB,
 157         .name = "Em28xx dvb Extension",
 158         .init = dvb_init,
 159         .fini = dvb_fini,
 160 };
 161
 162 static int __init em28xx_dvb_register(void)
 163 {
 164         return em28xx_register_extension(&dvb_ops);
 165 }
 166
 167 static void __exit em28xx_dvb_unregister(void)
 168 {
 169         em28xx_unregister_extension(&dvb_ops);
 170 }
 171
 172 module_init(em28xx_dvb_register);
 173 module_exit(em28xx_dvb_unregister);