Hi Neeraj, > Add hci_nxp to the hci_uart module which adds support for the NXP BT > chips. This driver has Power Save feature that will put the NXP bluetooth > chip into sleep state, whenever there is no activity for certain duration > of time (2000ms), and will be woken up when any activity is to be > initiated. > > The Power Save feature can be configured with the following set > of commands (optional): > hcitool -i hci0 cmd 3F 23 02 00 00 (enable Power Save) > hcitool -i hci0 cmd 3F 23 03 00 00 (disable Power Save) > where, > OGF = 0x3F (vendor specific command) > OCF = 0x23 (command to set Power Save state) > arg[0] = 0x02 (disable Power Save) > arg[0] = 0x03 (enable Power Save) > arg[1,2,...] = XX (don't care) > > The sleep/wake-up source can be configured with the following set > of commands (optional): > hcitool -i hci0 cmd 3F 53 03 14 01 FF (set UART break method) > hcitool -i hci0 cmd 3F 53 03 14 00 FF (set UART DSR method) > where, > OGF = 0x3F (vendor specific command) > OCF = 0x53 (command to set sleep and wake-up source) > arg[0] = 0x00 (Chip to host method NONE) > arg[0] = 0x01 (Chip to host method UART DTR) > arg[0] = 0x02 (Chip to host method UART BREAK) > arg[0] = 0x03 (Chip to host method GPIO) > arg[1] = 0x14 (Chip to host GPIO[20] if arg[0] is 0x03, else 0xFF) > arg[2] = 0x00 (Host to chip method UART DSR) > arg[2] = 0x01 (Host to chip method UART BREAK) > arg[3] = 0xXX (Reserved for future use) > > By default, the hci_nxp sets power save enable, chip to host wake-up > source as GPIO and host to chip sleep and wake-up source as UART > break during driver initialization, by sending the respective > commands to the chip. > > Signed-off-by: Neeraj Sanjay Kale <neeraj.sanjaykale@xxxxxxx> > --- > v2: Changed the subject/summary lines and added more details in the > description. (Paul Menzel) > v3: Made internal functions static, optimized the code, added few > comments. (Sherry Sun) > v4: Reworked entire code to send vendor commands cmd23 and cmd53 by > using __hci_cmd_sync. (Luiz Augusto von Dentz) > v5: Used hci_command_hdr and combined OGF+OCF into a single opcode. > (Luiz Augusto von Dentz) > --- > MAINTAINERS | 6 + > drivers/bluetooth/Kconfig | 10 + > drivers/bluetooth/Makefile | 1 + > drivers/bluetooth/hci_ldisc.c | 6 + > drivers/bluetooth/hci_nxp.c | 592 ++++++++++++++++++++++++++++++++++ > drivers/bluetooth/hci_nxp.h | 94 ++++++ > drivers/bluetooth/hci_uart.h | 8 +- > 7 files changed, 716 insertions(+), 1 deletion(-) > create mode 100644 drivers/bluetooth/hci_nxp.c > create mode 100644 drivers/bluetooth/hci_nxp.h so this is a clear NAK. Add this as serdev driver and not hook further into the mess that is the HCI line discipline. Regards Marcel
