drivers/media/usb/pvrusb2/pvrusb2-eeprom.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *
   4  *  Copyright (C) 2005 Mike Isely <isely@pobox.com>
   5  *  Copyright (C) 2004 Aurelien Alleaume <slts@free.fr>
   6  */
   7
   8 #include <linux/slab.h>
   9 #include "pvrusb2-eeprom.h"
  10 #include "pvrusb2-hdw-internal.h"
  11 #include "pvrusb2-debug.h"
  12
  13 #define trace_eeprom(...) pvr2_trace(PVR2_TRACE_EEPROM,__VA_ARGS__)
  14
  15
  16
  17 /*
  18
  19    Read and analyze data in the eeprom.  Use tveeprom to figure out
  20    the packet structure, since this is another Hauppauge device and
  21    internally it has a family resemblance to ivtv-type devices
  22
  23 */
  24
  25 #include <media/tveeprom.h>
  26
  27 /* We seem to only be interested in the last 128 bytes of the EEPROM */
  28 #define EEPROM_SIZE 128
  29
  30 /* Grab EEPROM contents, needed for direct method. */
  31 static u8 *pvr2_eeprom_fetch(struct pvr2_hdw *hdw)
  32 {
  33         struct i2c_msg msg[2];
  34         u8 *eeprom;
  35         u8 iadd[2];
  36         u8 addr;
  37         u16 eepromSize;
  38         unsigned int offs;
  39         int ret;
  40         int mode16 = 0;
  41         unsigned pcnt,tcnt;
  42         eeprom = kzalloc(EEPROM_SIZE, GFP_KERNEL);
  43         if (!eeprom) {
  44                 pvr2_trace(PVR2_TRACE_ERROR_LEGS,
  45                            "Failed to allocate memory required to read eeprom");
  46                 return NULL;
  47         }
  48
  49         trace_eeprom("Value for eeprom addr from controller was 0x%x",
  50                      hdw->eeprom_addr);
  51         addr = hdw->eeprom_addr;
  52         /* Seems that if the high bit is set, then the *real* eeprom
  53            address is shifted right now bit position (noticed this in
  54            newer PVR USB2 hardware) */
  55         if (addr & 0x80) addr >>= 1;
  56
  57         /* FX2 documentation states that a 16bit-addressed eeprom is
  58            expected if the I2C address is an odd number (yeah, this is
  59            strange but it's what they do) */
  60         mode16 = (addr & 1);
  61         eepromSize = (mode16 ? 4096 : 256);
  62         trace_eeprom("Examining %d byte eeprom at location 0x%x using %d bit addressing",
  63                      eepromSize, addr,
  64                      mode16 ? 16 : 8);
  65
  66         msg[0].addr = addr;
  67         msg[0].flags = 0;
  68         msg[0].len = mode16 ? 2 : 1;
  69         msg[0].buf = iadd;
  70         msg[1].addr = addr;
  71         msg[1].flags = I2C_M_RD;
  72
  73         /* We have to do the actual eeprom data fetch ourselves, because
  74            (1) we're only fetching part of the eeprom, and (2) if we were
  75            getting the whole thing our I2C driver can't grab it in one
  76            pass - which is what tveeprom is otherwise going to attempt */
  77         for (tcnt = 0; tcnt < EEPROM_SIZE; tcnt += pcnt) {
  78                 pcnt = 16;
  79                 if (pcnt + tcnt > EEPROM_SIZE) pcnt = EEPROM_SIZE-tcnt;
  80                 offs = tcnt + (eepromSize - EEPROM_SIZE);
  81                 if (mode16) {
  82                         iadd[0] = offs >> 8;
  83                         iadd[1] = offs;
  84                 } else {
  85                         iadd[0] = offs;
  86                 }
  87                 msg[1].len = pcnt;
  88                 msg[1].buf = eeprom+tcnt;
  89                 if ((ret = i2c_transfer(&hdw->i2c_adap,
  90                                         msg,ARRAY_SIZE(msg))) != 2) {
  91                         pvr2_trace(PVR2_TRACE_ERROR_LEGS,
  92                                    "eeprom fetch set offs err=%d",ret);
  93                         kfree(eeprom);
  94                         return NULL;
  95                 }
  96         }
  97         return eeprom;
  98 }
  99
 100
 101 /* Directly call eeprom analysis function within tveeprom. */
 102 int pvr2_eeprom_analyze(struct pvr2_hdw *hdw)
 103 {
 104         u8 *eeprom;
 105         struct tveeprom tvdata;
 106
 107         memset(&tvdata,0,sizeof(tvdata));
 108
 109         eeprom = pvr2_eeprom_fetch(hdw);
 110         if (!eeprom)
 111                 return -EINVAL;
 112
 113         tveeprom_hauppauge_analog(&tvdata, eeprom);
 114
 115         trace_eeprom("eeprom assumed v4l tveeprom module");
 116         trace_eeprom("eeprom direct call results:");
 117         trace_eeprom("has_radio=%d",tvdata.has_radio);
 118         trace_eeprom("tuner_type=%d",tvdata.tuner_type);
 119         trace_eeprom("tuner_formats=0x%x",tvdata.tuner_formats);
 120         trace_eeprom("audio_processor=%d",tvdata.audio_processor);
 121         trace_eeprom("model=%d",tvdata.model);
 122         trace_eeprom("revision=%d",tvdata.revision);
 123         trace_eeprom("serial_number=%d",tvdata.serial_number);
 124         trace_eeprom("rev_str=%s",tvdata.rev_str);
 125         hdw->tuner_type = tvdata.tuner_type;
 126         hdw->tuner_updated = !0;
 127         hdw->serial_number = tvdata.serial_number;
 128         hdw->std_mask_eeprom = tvdata.tuner_formats;
 129
 130         kfree(eeprom);
 131
 132         return 0;
 133 }