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 /* GPIO */
  52 static void cxusb_gpio_tuner(struct dvb_usb_device *d, int onoff)
  53 {
  54         struct cxusb_state *st = d->priv;
  55         u8 o[2],i;
  56
  57         if (st->gpio_write_state[GPIO_TUNER] == onoff)
  58                 return;
  59
  60         o[0] = GPIO_TUNER;
  61         o[1] = onoff;
  62         cxusb_ctrl_msg(d,CMD_GPIO_WRITE,o,2,&i,1);
  63
  64         if (i != 0x01)
  65                 deb_info("gpio_write failed.\n");
  66
  67         st->gpio_write_state[GPIO_TUNER] = onoff;
  68 }
  69
  70 /* I2C */
  71 static int cxusb_i2c_xfer(struct i2c_adapter *adap,struct i2c_msg msg[],int num)
  72 {
  73         struct dvb_usb_device *d = i2c_get_adapdata(adap);
  74         int i;
  75
  76         if (down_interruptible(&d->i2c_sem) < 0)
  77                 return -EAGAIN;
  78
  79         if (num > 2)
  80                 warn("more than 2 i2c messages at a time is not handled yet. TODO.");
  81
  82         for (i = 0; i < num; i++) {
  83
  84                 switch (msg[i].addr) {
  85                         case 0x63:
  86                                 cxusb_gpio_tuner(d,0);
  87                                 break;
  88                         default:
  89                                 cxusb_gpio_tuner(d,1);
  90                                 break;
  91                 }
  92
  93                 /* read request */
  94                 if (i+1 < num && (msg[i+1].flags & I2C_M_RD)) {
  95                         u8 obuf[3+msg[i].len], ibuf[1+msg[i+1].len];
  96                         obuf[0] = msg[i].len;
  97                         obuf[1] = msg[i+1].len;
  98                         obuf[2] = msg[i].addr;
  99                         memcpy(&obuf[3],msg[i].buf,msg[i].len);
 100
 101                         if (cxusb_ctrl_msg(d, CMD_I2C_READ,
 102                                                 obuf, 3+msg[i].len,
 103                                                 ibuf, 1+msg[i+1].len) < 0)
 104                                 break;
 105
 106                         if (ibuf[0] != 0x08)
 107                                 deb_info("i2c read could have been failed\n");
 108
 109                         memcpy(msg[i+1].buf,&ibuf[1],msg[i+1].len);
 110
 111                         i++;
 112                 } else { /* write */
 113                         u8 obuf[2+msg[i].len], ibuf;
 114                         obuf[0] = msg[i].addr;
 115                         obuf[1] = msg[i].len;
 116                         memcpy(&obuf[2],msg[i].buf,msg[i].len);
 117
 118                         if (cxusb_ctrl_msg(d,CMD_I2C_WRITE, obuf, 2+msg[i].len, &ibuf,1) < 0)
 119                                 break;
 120                         if (ibuf != 0x08)
 121                                 deb_info("i2c write could have been failed\n");
 122                 }
 123         }
 124
 125         up(&d->i2c_sem);
 126         return i;
 127 }
 128
 129 static u32 cxusb_i2c_func(struct i2c_adapter *adapter)
 130 {
 131         return I2C_FUNC_I2C;
 132 }
 133
 134 static struct i2c_algorithm cxusb_i2c_algo = {
 135         .master_xfer   = cxusb_i2c_xfer,
 136         .functionality = cxusb_i2c_func,
 137 };
 138
 139 static int cxusb_power_ctrl(struct dvb_usb_device *d, int onoff)
 140 {
 141         u8 b = 0;
 142         if (onoff)
 143                 return cxusb_ctrl_msg(d, CMD_POWER_ON, &b, 1, NULL, 0);
 144         else
 145                 return cxusb_ctrl_msg(d, CMD_POWER_OFF, &b, 1, NULL, 0);
 146 }
 147
 148 static int cxusb_streaming_ctrl(struct dvb_usb_device *d, int onoff)
 149 {
 150         u8 buf[2] = { 0x03, 0x00 };
 151         if (onoff)
 152                 cxusb_ctrl_msg(d,CMD_STREAMING_ON, buf, 2, NULL, 0);
 153         else
 154                 cxusb_ctrl_msg(d,CMD_STREAMING_OFF, NULL, 0, NULL, 0);
 155
 156         return 0;
 157 }
 158
 159 struct cx22702_config cxusb_cx22702_config = {
 160         .demod_address = 0x63,
 161
 162         .output_mode = CX22702_PARALLEL_OUTPUT,
 163
 164         .pll_init = dvb_usb_pll_init_i2c,
 165         .pll_set  = dvb_usb_pll_set_i2c,
 166 };
 167
 168 /* Callbacks for DVB USB */
 169 static int cxusb_tuner_attach(struct dvb_usb_device *d)
 170 {
 171         u8 bpll[4] = { 0x0b, 0xdc, 0x9c, 0xa0 };
 172         d->pll_addr = 0x61;
 173         memcpy(d->pll_init,bpll,4);
 174         d->pll_desc = &dvb_pll_fmd1216me;
 175         return 0;
 176 }
 177
 178 static int cxusb_frontend_attach(struct dvb_usb_device *d)
 179 {
 180         u8 b;
 181         if (usb_set_interface(d->udev,0,6) < 0)
 182                 err("set interface failed");
 183
 184         cxusb_ctrl_msg(d,CMD_DIGITAL, NULL, 0, &b, 1);
 185
 186         if ((d->fe = cx22702_attach(&cxusb_cx22702_config, &d->i2c_adap)) != NULL)
 187                 return 0;
 188
 189         return -EIO;
 190 }
 191
 192 /* DVB USB Driver stuff */
 193 static struct dvb_usb_properties cxusb_properties;
 194
 195 static int cxusb_probe(struct usb_interface *intf,
 196                 const struct usb_device_id *id)
 197 {
 198         return dvb_usb_device_init(intf,&cxusb_properties,THIS_MODULE,NULL);
 199 }
 200
 201 static struct usb_device_id cxusb_table [] = {
 202                 { USB_DEVICE(USB_VID_MEDION, USB_PID_MEDION_MD95700) },
 203                 {}              /* Terminating entry */
 204 };
 205 MODULE_DEVICE_TABLE (usb, cxusb_table);
 206
 207 static struct dvb_usb_properties cxusb_properties = {
 208         .caps = DVB_USB_IS_AN_I2C_ADAPTER,
 209
 210         .usb_ctrl = CYPRESS_FX2,
 211
 212         .size_of_priv     = sizeof(struct cxusb_state),
 213
 214         .streaming_ctrl   = cxusb_streaming_ctrl,
 215         .power_ctrl       = cxusb_power_ctrl,
 216         .frontend_attach  = cxusb_frontend_attach,
 217         .tuner_attach     = cxusb_tuner_attach,
 218
 219         .i2c_algo         = &cxusb_i2c_algo,
 220
 221         .generic_bulk_ctrl_endpoint = 0x01,
 222         /* parameter for the MPEG2-data transfer */
 223         .urb = {
 224                 .type = DVB_USB_BULK,
 225                 .count = 5,
 226                 .endpoint = 0x02,
 227                 .u = {
 228                         .bulk = {
 229                                 .buffersize = 8192,
 230                         }
 231                 }
 232         },
 233
 234         .num_device_descs = 1,
 235         .devices = {
 236                 {   "Medion MD95700 (MDUSBTV-HYBRID)",
 237                         { NULL },
 238                         { &cxusb_table[0], NULL },
 239                 },
 240         }
 241 };
 242
 243 static struct usb_driver cxusb_driver = {
 244         .owner          = THIS_MODULE,
 245         .name           = "dvb_usb_cxusb",
 246         .probe          = cxusb_probe,
 247         .disconnect = dvb_usb_device_exit,
 248         .id_table       = cxusb_table,
 249 };
 250
 251 /* module stuff */
 252 static int __init cxusb_module_init(void)
 253 {
 254         int result;
 255         if ((result = usb_register(&cxusb_driver))) {
 256                 err("usb_register failed. Error number %d",result);
 257                 return result;
 258         }
 259
 260         return 0;
 261 }
 262
 263 static void __exit cxusb_module_exit(void)
 264 {
 265         /* deregister this driver from the USB subsystem */
 266         usb_deregister(&cxusb_driver);
 267 }
 268
 269 module_init (cxusb_module_init);
 270 module_exit (cxusb_module_exit);
 271
 272 MODULE_AUTHOR("Patrick Boettcher <patrick.boettcher@desy.de>");
 273 MODULE_DESCRIPTION("Driver for Conexant USB2.0 hybrid reference design");
 274 MODULE_VERSION("1.0-alpha");
 275 MODULE_LICENSE("GPL");