drivers/media/usb/dvb-usb/m920x.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _DVB_USB_M920X_H_
   3 #define _DVB_USB_M920X_H_
   4
   5 #define DVB_USB_LOG_PREFIX "m920x"
   6 #include "dvb-usb.h"
   7
   8 #define deb(args...)   dprintk(dvb_usb_m920x_debug,0x01,args)
   9
  10 #define M9206_CORE      0x22
  11 #define M9206_RC_STATE  0xff51
  12 #define M9206_RC_KEY    0xff52
  13 #define M9206_RC_INIT1  0xff54
  14 #define M9206_RC_INIT2  0xff55
  15 #define M9206_FW_GO     0xff69
  16
  17 #define M9206_I2C       0x23
  18 #define M9206_FILTER    0x25
  19 #define M9206_FW        0x30
  20
  21 #define M9206_MAX_FILTERS 8
  22 #define M9206_MAX_ADAPTERS 4
  23
  24 /*
  25 sequences found in logs:
  26 [index value]
  27 0x80 write addr
  28 (0x00 out byte)*
  29 0x40 out byte
  30
  31 0x80 write addr
  32 (0x00 out byte)*
  33 0x80 read addr
  34 (0x21 in byte)*
  35 0x60 in byte
  36
  37 this sequence works:
  38 0x80 read addr
  39 (0x21 in byte)*
  40 0x60 in byte
  41
  42 Guess at API of the I2C function:
  43 I2C operation is done one byte at a time with USB control messages.  The
  44 index the messages is sent to is made up of a set of flags that control
  45 the I2C bus state:
  46 0x80:  Send START condition.  After a START condition, one would normally
  47        always send the 7-bit slave I2C address as the 7 MSB, followed by
  48        the read/write bit as the LSB.
  49 0x40:  Send STOP condition.  This should be set on the last byte of an
  50        I2C transaction.
  51 0x20:  Read a byte from the slave.  As opposed to writing a byte to the
  52        slave.  The slave will normally not produce any data unless you
  53        set the R/W bit to 1 when sending the slave's address after the
  54        START condition.
  55 0x01:  Respond with ACK, as opposed to a NACK.  For a multi-byte read,
  56        the master should send an ACK, that is pull SDA low during the 9th
  57        clock cycle, after every byte but the last.  This flags only makes
  58        sense when bit 0x20 is set, indicating a read.
  59
  60 What any other bits might mean, or how to get the slave's ACK/NACK
  61 response to a write, is unknown.
  62 */
  63
  64 struct m920x_state {
  65         u16 filters[M9206_MAX_ADAPTERS][M9206_MAX_FILTERS];
  66         int filtering_enabled[M9206_MAX_ADAPTERS];
  67         int rep_count;
  68 };
  69
  70 /* Initialisation data for the m920x
  71  */
  72
  73 struct m920x_inits {
  74         u16 address;
  75         u8  data;
  76 };
  77
  78 #endif