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-rw-r--r--drivers/media/dvb/dvb-usb/m920x.h46
1 files changed, 39 insertions, 7 deletions
diff --git a/drivers/media/dvb/dvb-usb/m920x.h b/drivers/media/dvb/dvb-usb/m920x.h
index c354196ffe5d..7dd3db65c80e 100644
--- a/drivers/media/dvb/dvb-usb/m920x.h
+++ b/drivers/media/dvb/dvb-usb/m920x.h
@@ -19,17 +19,49 @@
19 19
20#define M9206_MAX_FILTERS 8 20#define M9206_MAX_FILTERS 8
21 21
22#define M9206_I2C_TUNER 0 22/*
23#define M9206_I2C_DEMOD 1 23sequences found in logs:
24#define M9206_I2C_MAX 2 24[index value]
250x80 write addr
26(0x00 out byte)*
270x40 out byte
28
290x80 write addr
30(0x00 out byte)*
310x80 read addr
32(0x21 in byte)*
330x60 in byte
34
35this sequence works:
360x80 read addr
37(0x21 in byte)*
380x60 in byte
39
40Guess at API of the I2C function:
41I2C operation is done one byte at a time with USB control messages. The
42index the messages is sent to is made up of a set of flags that control
43the I2C bus state:
440x80: Send START condition. After a START condition, one would normally
45 always send the 7-bit slave I2C address as the 7 MSB, followed by
46 the read/write bit as the LSB.
470x40: Send STOP condition. This should be set on the last byte of an
48 I2C transaction.
490x20: Read a byte from the slave. As opposed to writing a byte to the
50 slave. The slave will normally not produce any data unless you
51 set the R/W bit to 1 when sending the slave's address after the
52 START condition.
530x01: Respond with ACK, as opposed to a NACK. For a multi-byte read,
54 the master should send an ACK, that is pull SDA low during the 9th
55 clock cycle, after every byte but the last. This flags only makes
56 sense when bit 0x20 is set, indicating a read.
57
58What any other bits might mean, or how to get the slave's ACK/NACK
59response to a write, is unknown.
60*/
25 61
26struct m9206_state { 62struct m9206_state {
27 u16 filters[M9206_MAX_FILTERS]; 63 u16 filters[M9206_MAX_FILTERS];
28 int filtering_enabled; 64 int filtering_enabled;
29 int rep_count; 65 int rep_count;
30 struct {
31 unsigned char addr;
32 unsigned char magic;
33 }i2c_r[M9206_I2C_MAX];
34}; 66};
35#endif 67#endif