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"
  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. */
 118 int 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)
 127                 return -EINVAL;
 128
 129         tveeprom_hauppauge_analog(NULL, &tvdata, eeprom);
 130
 131         trace_eeprom("eeprom assumed v4l tveeprom module");
 132         trace_eeprom("eeprom direct call results:");
 133         trace_eeprom("has_radio=%d",tvdata.has_radio);
 134         trace_eeprom("tuner_type=%d",tvdata.tuner_type);
 135         trace_eeprom("tuner_formats=0x%x",tvdata.tuner_formats);
 136         trace_eeprom("audio_processor=%d",tvdata.audio_processor);
 137         trace_eeprom("model=%d",tvdata.model);
 138         trace_eeprom("revision=%d",tvdata.revision);
 139         trace_eeprom("serial_number=%d",tvdata.serial_number);
 140         trace_eeprom("rev_str=%s",tvdata.rev_str);
 141         hdw->tuner_type = tvdata.tuner_type;
 142         hdw->tuner_updated = !0;
 143         hdw->serial_number = tvdata.serial_number;
 144         hdw->std_mask_eeprom = tvdata.tuner_formats;
 145
 146         kfree(eeprom);
 147
 148         return 0;
 149 }
 150
 151 /*
 152   Stuff for Emacs to see, in order to encourage consistent editing style:
 153   *** Local Variables: ***
 154   *** mode: c ***
 155   *** fill-column: 70 ***
 156   *** tab-width: 8 ***
 157   *** c-basic-offset: 8 ***
 158   *** End: ***
 159   */