diff options
| author | Loic Poulain <loic.poulain@intel.com> | 2015-10-01 18:16:21 +0200 |
|---|---|---|
| committer | Marcel Holtmann <marcel@holtmann.org> | 2015-10-03 19:03:15 +0200 |
| commit | d06f107bcd828a6c3ecd4a7d449d5d0c0dba0326 (patch) | |
| tree | f6baf6dc3facd2edafdca06b4bd9e801bc1ef637 /drivers/bluetooth/btintel.h | |
| parent | aa6555622cdf443f0b001352fdc3afb6e7bce20d (diff) | |
Bluetooth: btintel: Add iBT register access over HCI support
Add regmap ibt to support Intel Bluetooth silicon register access
over HCI. Intel BT/FM combo chip allows to read/write some registers
(e.g. FM registers) via its HCI interface.
Read/Write operations are performed via a HCI transaction composed of
a HCI command (host->controller) followed by a HCI command complete
event (controller->host). Read/Write Command opcodes can be specified
to the regmap init function.
We define data formats which are intel/vendor specific.
Register Read/Write HCI command payload (Host):
Field: | REG ADDR | MODE | DATA_LEN | DATA... |
size: | 32b | 8b | 8b | 8b* |
Register Read HCI command complete event payload (Controller):
Field: | CMD STATUS | REG ADDR | DATA... |
size: | 8b | 32b | 8b* |
Register Write HCI command complete event payload (Controller):
Field: | CMD_STATUS |
size: | 8b |
Since this payload is HCI encapsulated, Little Endian byte order is
used.
Write/Read Example:
If we write 0x0000002a at address 0x00008c04, with opcode_write 0xfc5d,
The resulting transaction is (btmon trace):
< HCI Command (0x3f|0x005d) plen 10 [hci0]
04 8c 00 00 02 04 2a 00 00 00
> HCI Event (0x0e) plen 4
Unknown (0x3f|0x005d) ncmd 1
00
Then, if we read the same register with opcode_read 0xfc5e:
< HCI Command (0x3f|0x005e) plen 6 [hci0]
04 8c 00 00 02 04
> HCI Event (0x0e) plen 12 [hci0]
Unknown (0x3f|0x005e) ncmd 1
00 04 8c 00 00 2a 00 00 00
Signed-off-by: Loic Poulain <loic.poulain@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'drivers/bluetooth/btintel.h')
| -rw-r--r-- | drivers/bluetooth/btintel.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/bluetooth/btintel.h b/drivers/bluetooth/btintel.h index 52deaf2817cf..f0655c476fd2 100644 --- a/drivers/bluetooth/btintel.h +++ b/drivers/bluetooth/btintel.h @@ -80,6 +80,9 @@ int btintel_secure_send(struct hci_dev *hdev, u8 fragment_type, u32 plen, const void *param); int btintel_load_ddc_config(struct hci_dev *hdev, const char *ddc_name); +struct regmap *btintel_regmap_init(struct hci_dev *hdev, u16 opcode_read, + u16 opcode_write); + #else static inline int btintel_check_bdaddr(struct hci_dev *hdev) @@ -113,4 +116,10 @@ static inline int btintel_load_ddc_config(struct hci_dev *hdev, return -EOPNOTSUPP; } +static inline struct regmap *btintel_regmap_init(struct hci_dev *hdev, + u16 opcode_read, + u16 opcode_write) +{ + return ERR_PTR(-EINVAL); +} #endif |