1 files changed, 78 insertions, 0 deletions
diff --git a/drivers/media/usb/dvb-usb/m920x.h b/drivers/media/usb/dvb-usb/m920x.h
new file mode 100644
index 000000000..bab3c6ac7
--- /dev/null
+++ b/drivers/media/usb/dvb-usb/m920x.h
@@ -0,0 +1,78 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _DVB_USB_M920X_H_
+#define _DVB_USB_M920X_H_
+
+#define DVB_USB_LOG_PREFIX "m920x"
+#include "dvb-usb.h"
+
+#define deb(args...)   dprintk(dvb_usb_m920x_debug,0x01,args)
+
+#define M9206_CORE	0x22
+#define M9206_RC_STATE	0xff51
+#define M9206_RC_KEY	0xff52
+#define M9206_RC_INIT1	0xff54
+#define M9206_RC_INIT2	0xff55
+#define M9206_FW_GO	0xff69
+
+#define M9206_I2C	0x23
+#define M9206_FILTER	0x25
+#define M9206_FW	0x30
+
+#define M9206_MAX_FILTERS 8
+#define M9206_MAX_ADAPTERS 4
+
+/*
+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
+
+Guess at API of the I2C function:
+I2C operation is done one byte at a time with USB control messages.  The
+index the messages is sent to is made up of a set of flags that control
+the I2C bus state:
+0x80:  Send START condition.  After a START condition, one would normally
+       always send the 7-bit slave I2C address as the 7 MSB, followed by
+       the read/write bit as the LSB.
+0x40:  Send STOP condition.  This should be set on the last byte of an
+       I2C transaction.
+0x20:  Read a byte from the slave.  As opposed to writing a byte to the
+       slave.  The slave will normally not produce any data unless you
+       set the R/W bit to 1 when sending the slave's address after the
+       START condition.
+0x01:  Respond with ACK, as opposed to a NACK.  For a multi-byte read,
+       the master should send an ACK, that is pull SDA low during the 9th
+       clock cycle, after every byte but the last.  This flags only makes
+       sense when bit 0x20 is set, indicating a read.
+
+What any other bits might mean, or how to get the slave's ACK/NACK
+response to a write, is unknown.
+*/
+
+struct m920x_state {
+	u16 filters[M9206_MAX_ADAPTERS][M9206_MAX_FILTERS];
+	int filtering_enabled[M9206_MAX_ADAPTERS];
+	int rep_count;
+};
+
+/* Initialisation data for the m920x
+ */
+
+struct m920x_inits {
+	u16 address;
+	u8  data;
+};
+
+#endif