drivers/media/usb/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. */
  45 static 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 required to read eeprom");
  60                 return NULL;
  61         }
  62
  63         trace_eeprom("Value for eeprom addr from controller was 0x%x",
  64                      hdw->eeprom_addr);
  65         addr = hdw->eeprom_addr;
  66         /* Seems that if the high bit is set, then the *real* eeprom
  67            address is shifted right now bit position (noticed this in
  68            newer PVR USB2 hardware) */
  69         if (addr & 0x80) addr >>= 1;
  70
  71         /* FX2 documentation states that a 16bit-addressed eeprom is
  72            expected if the I2C address is an odd number (yeah, this is
  73            strange but it's what they do) */
  74         mode16 = (addr & 1);
  75         eepromSize = (mode16 ? 4096 : 256);
  76         trace_eeprom("Examining %d byte eeprom at location 0x%x using %d bit addressing",
  77                      eepromSize, addr,
  78                      mode16 ? 16 : 8);
  79
  80         msg[0].addr = addr;
  81         msg[0].flags = 0;
  82         msg[0].len = mode16 ? 2 : 1;
  83         msg[0].buf = iadd;
  84         msg[1].addr = addr;
  85         msg[1].flags = I2C_M_RD;
  86
  87         /* We have to do the actual eeprom data fetch ourselves, because
  88            (1) we're only fetching part of the eeprom, and (2) if we were
  89            getting the whole thing our I2C driver can't grab it in one
  90            pass - which is what tveeprom is otherwise going to attempt */
  91         memset(eeprom,0,EEPROM_SIZE);
  92         for (tcnt = 0; tcnt < EEPROM_SIZE; tcnt += pcnt) {
  93                 pcnt = 16;
  94                 if (pcnt + tcnt > EEPROM_SIZE) pcnt = EEPROM_SIZE-tcnt;
  95                 offs = tcnt + (eepromSize - EEPROM_SIZE);
  96                 if (mode16) {
  97                         iadd[0] = offs >> 8;
  98                         iadd[1] = offs;
  99                 } else {
 100                         iadd[0] = offs;
 101                 }
 102                 msg[1].len = pcnt;
 103                 msg[1].buf = eeprom+tcnt;
 104                 if ((ret = i2c_transfer(&hdw->i2c_adap,
 105                                         msg,ARRAY_SIZE(msg))) != 2) {
 106                         pvr2_trace(PVR2_TRACE_ERROR_LEGS,
 107                                    "eeprom fetch set offs err=%d",ret);
 108                         kfree(eeprom);
 109                         return NULL;
 110                 }
 111         }
 112         return eeprom;
 113 }
 114
 115
 116 /* Directly call eeprom analysis function within tveeprom. */
 117 int pvr2_eeprom_analyze(struct pvr2_hdw *hdw)
 118 {
 119         u8 *eeprom;
 120         struct tveeprom tvdata;
 121
 122         memset(&tvdata,0,sizeof(tvdata));
 123
 124         eeprom = pvr2_eeprom_fetch(hdw);
 125         if (!eeprom) return -EINVAL;
 126
 127         {
 128                 struct i2c_client fake_client;
 129                 /* Newer version expects a useless client interface */
 130                 fake_client.addr = hdw->eeprom_addr;
 131                 fake_client.adapter = &hdw->i2c_adap;
 132                 tveeprom_hauppauge_analog(&fake_client,&tvdata,eeprom);
 133         }
 134
 135         trace_eeprom("eeprom assumed v4l tveeprom module");
 136         trace_eeprom("eeprom direct call results:");
 137         trace_eeprom("has_radio=%d",tvdata.has_radio);
 138         trace_eeprom("tuner_type=%d",tvdata.tuner_type);
 139         trace_eeprom("tuner_formats=0x%x",tvdata.tuner_formats);
 140         trace_eeprom("audio_processor=%d",tvdata.audio_processor);
 141         trace_eeprom("model=%d",tvdata.model);
 142         trace_eeprom("revision=%d",tvdata.revision);
 143         trace_eeprom("serial_number=%d",tvdata.serial_number);
 144         trace_eeprom("rev_str=%s",tvdata.rev_str);
 145         hdw->tuner_type = tvdata.tuner_type;
 146         hdw->tuner_updated = !0;
 147         hdw->serial_number = tvdata.serial_number;
 148         hdw->std_mask_eeprom = tvdata.tuner_formats;
 149
 150         kfree(eeprom);
 151
 152         return 0;
 153 }