V4L/DVB (5423): M920x: i2c cleanups
- Implement m920x i2c as suggested by Pierre Willenbrock
- remove "magic" hack
- r/w bit is not part of the i2c address
- move hardware remarks to header file
Signed-off-by: Aapo Tahkola <aet@rasterburn.org>
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
diff --git a/drivers/media/dvb/dvb-usb/m920x.h b/drivers/media/dvb/dvb-usb/m920x.h
index c354196..c5ef592 100644
--- a/drivers/media/dvb/dvb-usb/m920x.h
+++ b/drivers/media/dvb/dvb-usb/m920x.h
@@ -19,17 +19,35 @@
#define M9206_MAX_FILTERS 8
-#define M9206_I2C_TUNER 0
-#define M9206_I2C_DEMOD 1
-#define M9206_I2C_MAX 2
+/*
+sequences found in logs:
+[index value]
+0x80 write addr
+(0x00 out byte)*
+0x40 out byte
+
+0x80 write addr
+(0x00 out byte)*
+0x80 read addr
+(0x21 in byte)*
+0x60 in byte
+
+this sequence works:
+0x80 read addr
+(0x21 in byte)*
+0x60 in byte
+
+_my guess_:
+0x80: begin i2c transfer using address. value=address<<1|(reading?1:0)
+0x00: write byte
+0x21: read byte, more to follow
+0x40: write last byte of message sequence
+0x60: read last byte of message sequence
+ */
struct m9206_state {
u16 filters[M9206_MAX_FILTERS];
int filtering_enabled;
int rep_count;
- struct {
- unsigned char addr;
- unsigned char magic;
- }i2c_r[M9206_I2C_MAX];
};
#endif