drivers/media/dvb/dvb-usb/cxusb.c

   1 /* DVB USB compliant linux driver for Conexant USB reference design.
   2  *
   3  * The Conexant reference design I saw on their website was only for analogue
   4  * capturing (using the cx25842). The box I took to write this driver (reverse
   5  * engineered) is the one labeled Medion MD95700. In addition to the cx25842
   6  * for analogue capturing it also has a cx22702 DVB-T demodulator on the main
   7  * board. Besides it has a atiremote (X10) and a USB2.0 hub onboard.
   8  *
   9  * Maybe it is a little bit premature to call this driver cxusb, but I assume
  10  * the USB protocol is identical or at least inherited from the reference
  11  * design, so it can be reused for the "analogue-only" device (if it will
  12  * appear at all).
  13  *
  14  * TODO: check if the cx25840-driver (from ivtv) can be used for the analogue
  15  * part
  16  *
  17  * Copyright (C) 2005 Patrick Boettcher (patrick.boettcher@desy.de)
  18  *
  19  *      This program is free software; you can redistribute it and/or modify it
  20  *      under the terms of the GNU General Public License as published by the Free
  21  *      Software Foundation, version 2.
  22  *
  23  * see Documentation/dvb/README.dvb-usb for more information
  24  */
  25 #include "cxusb.h"
  26
  27 #include "cx22702.h"
  28
  29 /* debug */
  30 int dvb_usb_cxusb_debug;
  31 module_param_named(debug,dvb_usb_cxusb_debug, int, 0644);
  32 MODULE_PARM_DESC(debug, "set debugging level (1=rc (or-able))." DVB_USB_DEBUG_STATUS);
  33
  34 static int cxusb_ctrl_msg(struct dvb_usb_device *d,
  35                 u8 cmd, u8 *wbuf, int wlen, u8 *rbuf, int rlen)
  36 {
  37         int wo = (rbuf == NULL || rlen == 0); /* write-only */
  38         u8 sndbuf[1+wlen];
  39         memset(sndbuf,0,1+wlen);
  40
  41         sndbuf[0] = cmd;
  42         memcpy(&sndbuf[1],wbuf,wlen);
  43         if (wo)
  44                 dvb_usb_generic_write(d,sndbuf,1+wlen);
  45         else
  46                 dvb_usb_generic_rw(d,sndbuf,1+wlen,rbuf,rlen,0);
  47
  48         return 0;
  49 }
  50
  51 /* I2C */
  52 static void cxusb_set_i2c_path(struct dvb_usb_device *d, enum cxusb_i2c_pathes path)
  53 {
  54         struct cxusb_state *st = d->priv;
  55         u8 o[2],i;
  56
  57         if (path == st->cur_i2c_path)
  58                 return;
  59
  60         o[0] = IOCTL_SET_I2C_PATH;
  61         switch (path) {
  62                 case PATH_CX22702:
  63                         o[1] = 0;
  64                         break;
  65                 case PATH_TUNER_OTHER:
  66                         o[1] = 1;
  67                         break;
  68                 default:
  69                         err("unkown i2c path");
  70                         return;
  71         }
  72         cxusb_ctrl_msg(d,CMD_IOCTL,o,2,&i,1);
  73
  74         if (i != 0x01)
  75                 deb_info("i2c_path setting failed.\n");
  76
  77         st->cur_i2c_path = path;
  78 }
  79
  80 static int cxusb_i2c_xfer(struct i2c_adapter *adap,struct i2c_msg msg[],int num)
  81 {
  82         struct dvb_usb_device *d = i2c_get_adapdata(adap);
  83         int i;
  84
  85         if (down_interruptible(&d->i2c_sem) < 0)
  86                 return -EAGAIN;
  87
  88         if (num > 2)
  89                 warn("more than 2 i2c messages at a time is not handled yet. TODO.");
  90
  91         for (i = 0; i < num; i++) {
  92
  93                 switch (msg[i].addr) {
  94                         case 0x63:
  95                                 cxusb_set_i2c_path(d,PATH_CX22702);
  96                                 break;
  97                         default:
  98                                 cxusb_set_i2c_path(d,PATH_TUNER_OTHER);
  99                                 break;
 100                 }
 101
 102                 /* read request */
 103                 if (i+1 < num && (msg[i+1].flags & I2C_M_RD)) {
 104                         u8 obuf[3+msg[i].len], ibuf[1+msg[i+1].len];
 105                         obuf[0] = msg[i].len;
 106                         obuf[1] = msg[i+1].len;
 107                         obuf[2] = msg[i].addr;
 108                         memcpy(&obuf[3],msg[i].buf,msg[i].len);
 109
 110                         if (cxusb_ctrl_msg(d, CMD_I2C_READ,
 111                                                 obuf, 3+msg[i].len,
 112                                                 ibuf, 1+msg[i+1].len) < 0)
 113                                 break;
 114
 115                         if (ibuf[0] != 0x08)
 116                                 deb_info("i2c read could have been failed\n");
 117
 118                         memcpy(msg[i+1].buf,&ibuf[1],msg[i+1].len);
 119
 120                         i++;
 121                 } else { /* write */
 122                         u8 obuf[2+msg[i].len], ibuf;
 123                         obuf[0] = msg[i].addr;
 124                         obuf[1] = msg[i].len;
 125                         memcpy(&obuf[2],msg[i].buf,msg[i].len);
 126
 127                         if (cxusb_ctrl_msg(d,CMD_I2C_WRITE, obuf, 2+msg[i].len, &ibuf,1) < 0)
 128                                 break;
 129                         if (ibuf != 0x08)
 130                                 deb_info("i2c write could have been failed\n");
 131                 }
 132         }
 133
 134         up(&d->i2c_sem);
 135         return i;
 136 }
 137
 138 static u32 cxusb_i2c_func(struct i2c_adapter *adapter)
 139 {
 140         return I2C_FUNC_I2C;
 141 }
 142
 143 static struct i2c_algorithm cxusb_i2c_algo = {
 144         .master_xfer   = cxusb_i2c_xfer,
 145         .functionality = cxusb_i2c_func,
 146 };
 147
 148 static int cxusb_power_ctrl(struct dvb_usb_device *d, int onoff)
 149 {
 150         return 0;
 151 }
 152
 153 static int cxusb_streaming_ctrl(struct dvb_usb_device *d, int onoff)
 154 {
 155         u8 buf[2] = { 0x03, 0x00 };
 156         if (onoff)
 157                 cxusb_ctrl_msg(d,0x36, buf, 2, NULL, 0);
 158         else
 159                 cxusb_ctrl_msg(d,0x37, NULL, 0, NULL, 0);
 160
 161         return 0;
 162 }
 163
 164 struct cx22702_config cxusb_cx22702_config = {
 165         .demod_address = 0x63,
 166
 167         .output_mode = CX22702_PARALLEL_OUTPUT,
 168
 169         .pll_init = dvb_usb_pll_init_i2c,
 170         .pll_set  = dvb_usb_pll_set_i2c,
 171 };
 172
 173 /* Callbacks for DVB USB */
 174 static int cxusb_tuner_attach(struct dvb_usb_device *d)
 175 {
 176         u8 bpll[4] = { 0x0b, 0xdc, 0x9c, 0xa0 };
 177         d->pll_addr = 0x61;
 178         memcpy(d->pll_init,bpll,4);
 179         d->pll_desc = &dvb_pll_fmd1216me;
 180         return 0;
 181 }
 182
 183 static int cxusb_frontend_attach(struct dvb_usb_device *d)
 184 {
 185         u8 buf[2] = { 0x03, 0x00 };
 186         u8 b = 0;
 187
 188         if (usb_set_interface(d->udev,0,0) < 0)
 189                 err("set interface to alts=0 failed");
 190
 191         cxusb_ctrl_msg(d,0xde,&b,0,NULL,0);
 192         cxusb_set_i2c_path(d,PATH_TUNER_OTHER);
 193         cxusb_ctrl_msg(d,CMD_POWER_OFF, NULL, 0, &b, 1);
 194
 195         if (usb_set_interface(d->udev,0,6) < 0)
 196                 err("set interface failed");
 197
 198         cxusb_ctrl_msg(d,0x36, buf, 2, NULL, 0);
 199         cxusb_set_i2c_path(d,PATH_CX22702);
 200         cxusb_ctrl_msg(d,CMD_POWER_ON, NULL, 0, &b, 1);
 201
 202         if ((d->fe = cx22702_attach(&cxusb_cx22702_config, &d->i2c_adap)) != NULL)
 203                 return 0;
 204
 205         return -EIO;
 206 }
 207
 208 /* DVB USB Driver stuff */
 209 static struct dvb_usb_properties cxusb_properties;
 210
 211 static int cxusb_probe(struct usb_interface *intf,
 212                 const struct usb_device_id *id)
 213 {
 214         return dvb_usb_device_init(intf,&cxusb_properties,THIS_MODULE);
 215 }
 216
 217 static struct usb_device_id cxusb_table [] = {
 218                 { USB_DEVICE(USB_VID_MEDION, USB_PID_MEDION_MD95700) },
 219                 {}              /* Terminating entry */
 220 };
 221 MODULE_DEVICE_TABLE (usb, cxusb_table);
 222
 223 static struct dvb_usb_properties cxusb_properties = {
 224         .caps = DVB_USB_IS_AN_I2C_ADAPTER,
 225
 226         .usb_ctrl = CYPRESS_FX2,
 227
 228         .size_of_priv     = sizeof(struct cxusb_state),
 229
 230         .streaming_ctrl   = cxusb_streaming_ctrl,
 231         .power_ctrl       = cxusb_power_ctrl,
 232         .frontend_attach  = cxusb_frontend_attach,
 233         .tuner_attach     = cxusb_tuner_attach,
 234
 235         .i2c_algo         = &cxusb_i2c_algo,
 236
 237         .generic_bulk_ctrl_endpoint = 0x01,
 238         /* parameter for the MPEG2-data transfer */
 239         .urb = {
 240                 .type = DVB_USB_ISOC,
 241                 .count = 5,
 242                 .endpoint = 0x02,
 243                 .u = {
 244                         .isoc = {
 245                                 .framesperurb = 32,
 246                                 .framesize = 940,
 247                                 .interval = 5,
 248                         }
 249                 }
 250         },
 251
 252         .num_device_descs = 1,
 253         .devices = {
 254                 {   "Medion MD95700 (MDUSBTV-HYBRID)",
 255                         { NULL },
 256                         { &cxusb_table[0], NULL },
 257                 },
 258         }
 259 };
 260
 261 static struct usb_driver cxusb_driver = {
 262         .owner          = THIS_MODULE,
 263         .name           = "dvb_usb_cxusb",
 264         .probe          = cxusb_probe,
 265         .disconnect = dvb_usb_device_exit,
 266         .id_table       = cxusb_table,
 267 };
 268
 269 /* module stuff */
 270 static int __init cxusb_module_init(void)
 271 {
 272         int result;
 273         if ((result = usb_register(&cxusb_driver))) {
 274                 err("usb_register failed. Error number %d",result);
 275                 return result;
 276         }
 277
 278         return 0;
 279 }
 280
 281 static void __exit cxusb_module_exit(void)
 282 {
 283         /* deregister this driver from the USB subsystem */
 284         usb_deregister(&cxusb_driver);
 285 }
 286
 287 module_init (cxusb_module_init);
 288 module_exit (cxusb_module_exit);
 289
 290 MODULE_AUTHOR("Patrick Boettcher <patrick.boettcher@desy.de>");
 291 MODULE_DESCRIPTION("Driver for Conexant USB2.0 hybrid reference design");
 292 MODULE_VERSION("1.0-alpha");
 293 MODULE_LICENSE("GPL");