LXR linux/drivers/media/video/pvrusb2/pvrusb2-eeprom.c

   1/*
   2 *
   3 *
   4 *  Copyright (C) 2005 Mike Isely <isely@pobox.com>
   5 *  Copyright (C) 2004 Aurelien Alleaume <slts@free.fr>
   6 *
   7 *  This program is free software; you can redistribute it and/or modify
   8 *  it under the terms of the GNU General Public License as published by
   9 *  the Free Software Foundation; either version 2 of the License
  10 *
  11 *  This program is distributed in the hope that it will be useful,
  12 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 *  GNU General Public License for more details.
  15 *
  16 *  You should have received a copy of the GNU General Public License
  17 *  along with this program; if not, write to the Free Software
  18 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19 *
  20 */
  21
  22#include <linux/slab.h>
  23#include "pvrusb2-eeprom.h"
  24#include "pvrusb2-hdw-internal.h"
  25#include "pvrusb2-debug.h"
  26
  27#define trace_eeprom(...) pvr2_trace(PVR2_TRACE_EEPROM,__VA_ARGS__)
  28
  29
  30
  31/*
  32
  33   Read and analyze data in the eeprom.  Use tveeprom to figure out
  34   the packet structure, since this is another Hauppauge device and
  35   internally it has a family resemblance to ivtv-type devices
  36
  37*/
  38
  39#include <media/tveeprom.h>
  40
  41/* We seem to only be interested in the last 128 bytes of the EEPROM */
  42#define EEPROM_SIZE 128
  43
  44/* Grab EEPROM contents, needed for direct method. */
  45static u8 *pvr2_eeprom_fetch(struct pvr2_hdw *hdw)
  46{
  47        struct i2c_msg msg[2];
  48        u8 *eeprom;
  49        u8 iadd[2];
  50        u8 addr;
  51        u16 eepromSize;
  52        unsigned int offs;
  53        int ret;
  54        int mode16 = 0;
  55        unsigned pcnt,tcnt;
  56        eeprom = kmalloc(EEPROM_SIZE,GFP_KERNEL);
  57        if (!eeprom) {
  58                pvr2_trace(PVR2_TRACE_ERROR_LEGS,
  59                           "Failed to allocate memory"
  60                           " required to read eeprom");
  61                return NULL;
  62        }
  63
  64        trace_eeprom("Value for eeprom addr from controller was 0x%x",
  65                     hdw->eeprom_addr);
  66        addr = hdw->eeprom_addr;
  67        /* Seems that if the high bit is set, then the *real* eeprom
  68           address is shifted right now bit position (noticed this in
  69           newer PVR USB2 hardware) */
  70        if (addr & 0x80) addr >>= 1;
  71
  72        /* FX2 documentation states that a 16bit-addressed eeprom is
  73           expected if the I2C address is an odd number (yeah, this is
  74           strange but it's what they do) */
  75        mode16 = (addr & 1);
  76        eepromSize = (mode16 ? 4096 : 256);
  77        trace_eeprom("Examining %d byte eeprom at location 0x%x"
  78                     " using %d bit addressing",eepromSize,addr,
  79                     mode16 ? 16 : 8);
  80
  81        msg[0].addr = addr;
  82        msg[0].flags = 0;
  83        msg[0].len = mode16 ? 2 : 1;
  84        msg[0].buf = iadd;
  85        msg[1].addr = addr;
  86        msg[1].flags = I2C_M_RD;
  87
  88        /* We have to do the actual eeprom data fetch ourselves, because
  89           (1) we're only fetching part of the eeprom, and (2) if we were
  90           getting the whole thing our I2C driver can't grab it in one
  91           pass - which is what tveeprom is otherwise going to attempt */
  92        memset(eeprom,0,EEPROM_SIZE);
  93        for (tcnt = 0; tcnt < EEPROM_SIZE; tcnt += pcnt) {
  94                pcnt = 16;
  95                if (pcnt + tcnt > EEPROM_SIZE) pcnt = EEPROM_SIZE-tcnt;
  96                offs = tcnt + (eepromSize - EEPROM_SIZE);
  97                if (mode16) {
  98                        iadd[0] = offs >> 8;
  99                        iadd[1] = offs;
 100                } else {
 101                        iadd[0] = offs;
 102                }
 103                msg[1].len = pcnt;
 104                msg[1].buf = eeprom+tcnt;
 105                if ((ret = i2c_transfer(&hdw->i2c_adap,
 106                                        msg,ARRAY_SIZE(msg))) != 2) {
 107                        pvr2_trace(PVR2_TRACE_ERROR_LEGS,
 108                                   "eeprom fetch set offs err=%d",ret);
 109                        kfree(eeprom);
 110                        return NULL;
 111                }
 112        }
 113        return eeprom;
 114}
 115
 116
 117/* Directly call eeprom analysis function within tveeprom. */
 118int pvr2_eeprom_analyze(struct pvr2_hdw *hdw)
 119{
 120        u8 *eeprom;
 121        struct tveeprom tvdata;
 122
 123        memset(&tvdata,0,sizeof(tvdata));
 124
 125        eeprom = pvr2_eeprom_fetch(hdw);
 126        if (!eeprom) return -EINVAL;
 127
 128        {
 129                struct i2c_client fake_client;
 130                /* Newer version expects a useless client interface */
 131                fake_client.addr = hdw->eeprom_addr;
 132                fake_client.adapter = &hdw->i2c_adap;
 133                tveeprom_hauppauge_analog(&fake_client,&tvdata,eeprom);
 134        }
 135
 136        trace_eeprom("eeprom assumed v4l tveeprom module");
 137        trace_eeprom("eeprom direct call results:");
 138        trace_eeprom("has_radio=%d",tvdata.has_radio);
 139        trace_eeprom("tuner_type=%d",tvdata.tuner_type);
 140        trace_eeprom("tuner_formats=0x%x",tvdata.tuner_formats);
 141        trace_eeprom("audio_processor=%d",tvdata.audio_processor);
 142        trace_eeprom("model=%d",tvdata.model);
 143        trace_eeprom("revision=%d",tvdata.revision);
 144        trace_eeprom("serial_number=%d",tvdata.serial_number);
 145        trace_eeprom("rev_str=%s",tvdata.rev_str);
 146        hdw->tuner_type = tvdata.tuner_type;
 147        hdw->tuner_updated = !0;
 148        hdw->serial_number = tvdata.serial_number;
 149        hdw->std_mask_eeprom = tvdata.tuner_formats;
 150
 151        kfree(eeprom);
 152
 153        return 0;
 154}
 155
 156/*
 157  Stuff for Emacs to see, in order to encourage consistent editing style:
 158  *** Local Variables: ***
 159  *** mode: c ***
 160  *** fill-column: 70 ***
 161  *** tab-width: 8 ***
 162  *** c-basic-offset: 8 ***
 163  *** End: ***
 164  */
 165