usb/dvb-usb/m920x.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 #ifndef _DVB_USB_M920X_H_
0003 #define _DVB_USB_M920X_H_
0004
0005 #define DVB_USB_LOG_PREFIX "m920x"
0006 #include "dvb-usb.h"
0007
0008 #define deb(args...)   dprintk(dvb_usb_m920x_debug,0x01,args)
0009
0010 #define M9206_CORE  0x22
0011 #define M9206_RC_STATE  0xff51
0012 #define M9206_RC_KEY    0xff52
0013 #define M9206_RC_INIT1  0xff54
0014 #define M9206_RC_INIT2  0xff55
0015 #define M9206_FW_GO 0xff69
0016
0017 #define M9206_I2C   0x23
0018 #define M9206_FILTER    0x25
0019 #define M9206_FW    0x30
0020
0021 #define M9206_MAX_FILTERS 8
0022 #define M9206_MAX_ADAPTERS 4
0023
0024 /*
0025 sequences found in logs:
0026 [index value]
0027 0x80 write addr
0028 (0x00 out byte)*
0029 0x40 out byte
0030
0031 0x80 write addr
0032 (0x00 out byte)*
0033 0x80 read addr
0034 (0x21 in byte)*
0035 0x60 in byte
0036
0037 this sequence works:
0038 0x80 read addr
0039 (0x21 in byte)*
0040 0x60 in byte
0041
0042 Guess at API of the I2C function:
0043 I2C operation is done one byte at a time with USB control messages.  The
0044 index the messages is sent to is made up of a set of flags that control
0045 the I2C bus state:
0046 0x80:  Send START condition.  After a START condition, one would normally
0047        always send the 7-bit slave I2C address as the 7 MSB, followed by
0048        the read/write bit as the LSB.
0049 0x40:  Send STOP condition.  This should be set on the last byte of an
0050        I2C transaction.
0051 0x20:  Read a byte from the slave.  As opposed to writing a byte to the
0052        slave.  The slave will normally not produce any data unless you
0053        set the R/W bit to 1 when sending the slave's address after the
0054        START condition.
0055 0x01:  Respond with ACK, as opposed to a NACK.  For a multi-byte read,
0056        the master should send an ACK, that is pull SDA low during the 9th
0057        clock cycle, after every byte but the last.  This flags only makes
0058        sense when bit 0x20 is set, indicating a read.
0059
0060 What any other bits might mean, or how to get the slave's ACK/NACK
0061 response to a write, is unknown.
0062 */
0063
0064 struct m920x_state {
0065     u16 filters[M9206_MAX_ADAPTERS][M9206_MAX_FILTERS];
0066     int filtering_enabled[M9206_MAX_ADAPTERS];
0067     int rep_count;
0068 };
0069
0070 /* Initialisation data for the m920x
0071  */
0072
0073 struct m920x_inits {
0074     u16 address;
0075     u8  data;
0076 };
0077
0078 #endif