Bluetooth: Add HCI SPI driver
This driver acts as a pass-through, taking raw HCI data, converting it to SPI comms and vice versa. It works in the same way as the existing H:4 and H:5 drivers, only it uses SPI instead of UART. In this first release, the only BLE board which has been tested is the X-NUCLEO-IDB05A1: http://www.st.com/en/ecosystems/x-nucleo-idb05a1.html Although the current supported SPI format works like the one below, it should be trivial to adapt it to support other chips with a different format. SANITY CHECK = 0x02 SPI WRITE = 0x0A SPI READ = 0x0B Tx Format: [HOST] {SPI WRITE} 0x00 0x00 0x00 0x00 {HCI MESSAGE ...} [CHIP] {SANITY CHECK} {FLASH SIZE} 0x00 0x00 0x00 {0xFF * MESSAGE LEN} Rx Format: {IRQ LINE GOES HIGH} [HOST] {SPI READ} 0x00 0x00 0x00 0x00 {0xFF * BYTES TO READ} [CHIP] 0x02 {FLASH SIZE} 0x00 {BYTES TO READ} 0x00 {HCI MESSAGE ...} Change-Id: I4a00711c922d9ea02c5e2afb0d16715e413b1ed5 Signed-off-by: Lee Jones <lee.jones@linaro.org>
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3 changed files with 433 additions and 0 deletions
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@ -48,6 +48,16 @@ config BLUETOOTH_H5
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Bluetooth three-wire (H:5) UART driver. Implementation of HCI
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Bluetooth three-wire (H:5) UART driver. Implementation of HCI
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Three-Wire UART Transport Layer.
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Three-Wire UART Transport Layer.
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config BLUETOOTH_SPI
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bool "SPI HCI"
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select SPI
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help
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Supports Bluetooth ICs using SPI as the communication protocol.
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HCI packets are sent and received as single Byte transferrs,
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prepended after a known header. Headers may vary per device, so
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additional platform specific knowlege may need to be added as
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devices are. Current driver supports; ST X-NUCLEO BLE series.
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config BLUETOOTH_NO_DRIVER
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config BLUETOOTH_NO_DRIVER
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bool "No default HCI driver"
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bool "No default HCI driver"
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help
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help
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@ -73,6 +83,17 @@ config BLUETOOTH_UART_ON_DEV_NAME
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This option specifies the name of UART device to be used
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This option specifies the name of UART device to be used
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for Bluetooth.
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for Bluetooth.
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config BLUETOOTH_SPI_DEV_NAME
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string "Device Name of SPI Device for Bluetooth"
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default "SPI_0"
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depends on BLUETOOTH_SPI
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help
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This option specifies the name of SPI device to be used for Bluetooth.
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On the controller side, this SPI device is used to encapsulate the
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RAW HCI frames to send further up the stack. On the BLE stack side,
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this device is used to reply back with HCI frames that are sent over
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the air.
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# Headroom that the driver needs for sending and receiving buffers.
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# Headroom that the driver needs for sending and receiving buffers.
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# Add a new 'default' entry for each new driver.
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# Add a new 'default' entry for each new driver.
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@ -84,6 +105,7 @@ config BLUETOOTH_HCI_SEND_RESERVE
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default 0
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default 0
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default 0 if BLUETOOTH_H4
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default 0 if BLUETOOTH_H4
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default 1 if BLUETOOTH_H5
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default 1 if BLUETOOTH_H5
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default 1 if BLUETOOTH_SPI
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# Needed headroom for incoming buffers (from controller)
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# Needed headroom for incoming buffers (from controller)
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config BLUETOOTH_HCI_RECV_RESERVE
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config BLUETOOTH_HCI_RECV_RESERVE
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@ -93,3 +115,62 @@ config BLUETOOTH_HCI_RECV_RESERVE
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default 0
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default 0
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default 0 if BLUETOOTH_H4
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default 0 if BLUETOOTH_H4
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default 0 if BLUETOOTH_H5
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default 0 if BLUETOOTH_H5
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if BLUETOOTH_SPI
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config BLUETOOTH_SPI_CHIP_SELECT_DEV_NAME
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string "Chip Select (CS) line driver name"
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help
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This option specifies the name of GPIO driver controlling
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the Chip Select (CS) line.
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config BLUETOOTH_SPI_IRQ_DEV_NAME
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string "IRQ line driver name"
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help
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This option specifies the name of GPIO driver controlling
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the chip's IRQ line.
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config BLUETOOTH_SPI_RESET_DEV_NAME
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string "Reset line driver name"
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help
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This option specifies the name of GPIO driver controlling
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the chip's Reset line.
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config BLUETOOTH_SPI_CHIP_SELECT_PIN
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int "SPI Chip Select (CS) line number"
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help
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This option specifies the Chip Select (CS) line number on the SPI
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device
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config BLUETOOTH_SPI_IRQ_PIN
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int "SPI IRQ line number"
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help
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This option specifies the Reset line number on the SPI device
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config BLUETOOTH_SPI_RESET_PIN
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int "SPI Reset line number"
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help
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This option specifies the Reset line number on the SPI device
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config BLUETOOTH_SPI_RX_BUFFER_SIZE
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int "Receive buffer length"
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default 96
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help
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This option specifies the size of the RX buffer. Try to keep this
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as small as possible, since it's stored on the stack.
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config BLUETOOTH_SPI_TX_BUFFER_SIZE
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int "Transmit buffer length"
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default 64
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help
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This option specifies the size of the TX buffer. Try to keep this
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as small as possible, since it's stored on the stack.
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config BLUETOOTH_SPI_MAX_CLK_FREQ
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int "Maximum clock frequency for the HCI SPI interface"
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default 5000000
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help
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This option specifies the maximum clock rate the HCI SPI
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interface is capable of running at.
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endif # BLUETOOTH_SPI
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@ -1,2 +1,3 @@
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obj-$(CONFIG_BLUETOOTH_H4) += h4.o
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obj-$(CONFIG_BLUETOOTH_H4) += h4.o
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obj-$(CONFIG_BLUETOOTH_H5) += h5.o
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obj-$(CONFIG_BLUETOOTH_H5) += h5.o
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obj-$(CONFIG_BLUETOOTH_SPI) += spi.o
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351
drivers/bluetooth/hci/spi.c
Normal file
351
drivers/bluetooth/hci/spi.c
Normal file
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@ -0,0 +1,351 @@
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/* spi.c - SPI based Bluetooth driver */
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/*
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* Copyright (c) 2017 Linaro Ltd.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <gpio.h>
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#include <init.h>
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#include <spi.h>
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#include <misc/util.h>
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#define BT_DBG_ENABLED IS_ENABLED(CONFIG_BLUETOOTH_DEBUG_HCI_DRIVER)
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#include <bluetooth/log.h>
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#include <bluetooth/hci_driver.h>
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#define HCI_CMD 0x01
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#define HCI_ACL 0x02
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#define HCI_SCO 0x03
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#define HCI_EVT 0x04
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/* Special Values */
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#define SPI_WRITE 0x0A
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#define SPI_READ 0x0B
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#define READY_NOW 0x02
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#define EVT_BLUE_INITIALIZED 0x01
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/* Offsets */
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#define STATUS_HEADER_READY 0
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#define STATUS_HEADER_TOREAD 3
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#define EVT_HEADER_TYPE 0
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#define EVT_HEADER_EVENT 1
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#define EVT_HEADER_SIZE 2
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#define EVT_VENDOR_CODE_LSB 3
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#define EVT_VENDOR_CODE_MSB 4
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#define CMD_OGF 1
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#define CMD_OCF 2
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#define GPIO_IRQ_PIN CONFIG_BLUETOOTH_SPI_IRQ_PIN
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#define GPIO_CS_PIN CONFIG_BLUETOOTH_SPI_CHIP_SELECT_PIN
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#define GPIO_RESET_PIN CONFIG_BLUETOOTH_SPI_RESET_PIN
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#define MAX_RX_MSG_LEN CONFIG_BLUETOOTH_SPI_RX_BUFFER_SIZE
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#define MAX_TX_MSG_LEN CONFIG_BLUETOOTH_SPI_TX_BUFFER_SIZE
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static struct device *spi_dev;
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static struct device *cs_dev;
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static struct device *irq_dev;
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static struct device *rst_dev;
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static struct gpio_callback gpio_cb;
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static K_SEM_DEFINE(sem_initialised, 0, 1);
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static K_SEM_DEFINE(sem_request, 0, 1);
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static K_SEM_DEFINE(sem_busy, 1, 1);
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static BT_STACK_NOINIT(rx_stack, 448);
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static struct spi_config spi_conf = {
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.config = SPI_WORD(8),
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.max_sys_freq = CONFIG_BLUETOOTH_SPI_MAX_CLK_FREQ,
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};
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#if defined(CONFIG_BLUETOOTH_DEBUG_HCI_DRIVER)
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#include <misc/printk.h>
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static inline void spi_dump_message(const uint8_t *pre, uint8_t *buf,
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uint8_t size)
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{
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uint8_t i, c;
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printk("%s (%d): ", pre, size);
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for (i = 0; i < size; i++) {
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c = buf[i];
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printk("%x ", c);
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if (c >= 31 && c <= 126) {
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printk("[%c] ", c);
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} else {
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printk("[.] ");
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}
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}
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printk("\n");
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}
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#else
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static inline
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void spi_dump_message(const uint8_t *pre, uint8_t *buf, uint8_t size) {}
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#endif
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static inline uint16_t bt_spi_get_cmd(uint8_t *txmsg)
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{
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return (txmsg[CMD_OCF] << 8) | txmsg[CMD_OGF];
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}
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static inline uint16_t bt_spi_get_evt(uint8_t *rxmsg)
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{
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return (rxmsg[EVT_VENDOR_CODE_MSB] << 8) | rxmsg[EVT_VENDOR_CODE_LSB];
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}
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static void bt_spi_isr(struct device *unused1, struct gpio_callback *unused2,
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unsigned int unused3)
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{
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k_sem_give(&sem_request);
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}
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static void bt_spi_handle_vendor_evt(uint8_t *rxmsg)
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{
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switch (bt_spi_get_evt(rxmsg)) {
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case EVT_BLUE_INITIALIZED:
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k_sem_give(&sem_initialised);
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default:
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break;
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}
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}
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static void bt_spi_rx_thread(void)
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{
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struct net_buf *buf;
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uint8_t header_master[5] = { SPI_READ, 0x00, 0x00, 0x00, 0x00 };
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uint8_t header_slave[5];
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uint8_t rxmsg[MAX_RX_MSG_LEN];
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uint8_t dummy = 0xFF, size, i;
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while (true) {
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k_sem_take(&sem_request, K_FOREVER);
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k_sem_take(&sem_busy, K_FOREVER);
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do {
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gpio_pin_write(cs_dev, GPIO_CS_PIN, 1);
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gpio_pin_write(cs_dev, GPIO_CS_PIN, 0);
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spi_transceive(spi_dev,
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header_master, 5, header_slave, 5);
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} while (header_slave[STATUS_HEADER_TOREAD] == 0 ||
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header_slave[STATUS_HEADER_TOREAD] == 0xFF);
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size = header_slave[STATUS_HEADER_TOREAD];
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for (i = 0; i < size; i++) {
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spi_transceive(spi_dev, &dummy, 1, &rxmsg[i], 1);
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}
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gpio_pin_write(cs_dev, GPIO_CS_PIN, 1);
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k_sem_give(&sem_busy);
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spi_dump_message("RX:ed", rxmsg, size);
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/* Vendor events are currently unsupported */
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if (rxmsg[EVT_HEADER_EVENT] == BT_HCI_EVT_VENDOR) {
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bt_spi_handle_vendor_evt(rxmsg);
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continue;
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}
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switch (rxmsg[EVT_HEADER_TYPE]) {
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case HCI_EVT:
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buf = bt_buf_get_rx(K_FOREVER);
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bt_buf_set_type(buf, BT_BUF_EVT);
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break;
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case HCI_ACL:
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buf = bt_buf_get_rx(K_FOREVER);
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bt_buf_set_type(buf, BT_BUF_ACL_IN);
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break;
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default:
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BT_ERR("Unknown BT buf type %d", rxmsg[0]);
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continue;
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}
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net_buf_add_mem(buf, &rxmsg[1], rxmsg[EVT_HEADER_SIZE] + 2);
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if (rxmsg[EVT_HEADER_TYPE] == HCI_EVT &&
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bt_hci_evt_is_prio(rxmsg[EVT_HEADER_EVENT])) {
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bt_recv_prio(buf);
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} else {
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bt_recv(buf);
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}
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}
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}
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static int bt_spi_send(struct net_buf *buf)
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{
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uint8_t header[5] = { SPI_WRITE, 0x00, 0x00, 0x00, 0x00 };
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uint8_t rxmsg[MAX_TX_MSG_LEN + 1]; /* Extra Byte to account for TYPE */
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uint32_t pending;
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if (buf->len > MAX_TX_MSG_LEN) {
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BT_ERR("Message too long");
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return -EINVAL;
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}
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/* Allow time for the read thread to handle interrupt */
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while (true) {
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gpio_pin_read(irq_dev, GPIO_IRQ_PIN, &pending);
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if (!pending) {
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break;
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}
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k_sleep(1);
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}
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k_sem_take(&sem_busy, K_FOREVER);
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switch (bt_buf_get_type(buf)) {
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case BT_BUF_ACL_OUT:
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net_buf_push_u8(buf, HCI_ACL);
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break;
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case BT_BUF_CMD:
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net_buf_push_u8(buf, HCI_CMD);
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break;
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default:
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BT_ERR("Unsupported type");
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k_sem_give(&sem_busy);
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return -EINVAL;
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}
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/* Poll sanity values until device has woken-up */
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do {
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gpio_pin_write(cs_dev, GPIO_CS_PIN, 1);
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gpio_pin_write(cs_dev, GPIO_CS_PIN, 0);
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spi_transceive(spi_dev, header, 5, rxmsg, 5);
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/*
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* RX Header (rxmsg) must contain a sanity check Byte and size
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* information. If it does not contain BOTH then it is
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* sleeping or still in the initialisation stage (waking-up).
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*/
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} while (rxmsg[STATUS_HEADER_READY] != READY_NOW ||
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(rxmsg[1] | rxmsg[2] | rxmsg[3] | rxmsg[4]) == 0);
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/* Transmit the message */
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spi_transceive(spi_dev, buf->data, buf->len, rxmsg, buf->len);
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/* Deselect chip */
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||||||
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gpio_pin_write(cs_dev, GPIO_CS_PIN, 1);
|
||||||
|
k_sem_give(&sem_busy);
|
||||||
|
|
||||||
|
spi_dump_message("TX:ed", buf->data, buf->len);
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Since a RESET has been requested, the chip will now restart.
|
||||||
|
* Unfortunately the BlueNRG will reply with "reset received" but
|
||||||
|
* since it does not send back a NOP, we have no way to tell when the
|
||||||
|
* RESET has actually taken palce. Instead, we use the vendor command
|
||||||
|
* EVT_BLUE_INITIALIZED as an indication that it is safe to proceed.
|
||||||
|
*/
|
||||||
|
if (bt_spi_get_cmd(buf->data) == BT_HCI_OP_RESET) {
|
||||||
|
k_sem_take(&sem_initialised, K_FOREVER);
|
||||||
|
}
|
||||||
|
|
||||||
|
net_buf_unref(buf);
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int bt_spi_open(void)
|
||||||
|
{
|
||||||
|
/* Configure RST pin and hold BLE in Reset */
|
||||||
|
gpio_pin_configure(rst_dev, GPIO_RESET_PIN,
|
||||||
|
GPIO_DIR_OUT | GPIO_PUD_PULL_UP);
|
||||||
|
gpio_pin_write(rst_dev, GPIO_RESET_PIN, 0);
|
||||||
|
|
||||||
|
spi_configure(spi_dev, &spi_conf);
|
||||||
|
|
||||||
|
/* Configure the CS (Chip Select) pin */
|
||||||
|
gpio_pin_configure(cs_dev, GPIO_CS_PIN,
|
||||||
|
GPIO_DIR_OUT | GPIO_PUD_PULL_UP);
|
||||||
|
gpio_pin_write(cs_dev, GPIO_CS_PIN, 1);
|
||||||
|
|
||||||
|
/* Configure IRQ pin and the IRQ call-back/handler */
|
||||||
|
gpio_pin_configure(irq_dev, GPIO_IRQ_PIN,
|
||||||
|
GPIO_DIR_IN | GPIO_INT |
|
||||||
|
GPIO_INT_EDGE | GPIO_INT_ACTIVE_HIGH);
|
||||||
|
|
||||||
|
gpio_init_callback(&gpio_cb, bt_spi_isr, BIT(GPIO_IRQ_PIN));
|
||||||
|
|
||||||
|
if (gpio_add_callback(irq_dev, &gpio_cb)) {
|
||||||
|
return -EINVAL;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (gpio_pin_enable_callback(irq_dev, GPIO_IRQ_PIN)) {
|
||||||
|
return -EINVAL;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Start RX thread */
|
||||||
|
k_thread_spawn(rx_stack, sizeof(rx_stack),
|
||||||
|
(k_thread_entry_t)bt_spi_rx_thread,
|
||||||
|
NULL, NULL, NULL, K_PRIO_COOP(7), 0, K_NO_WAIT);
|
||||||
|
|
||||||
|
/* Take BLE out of reset */
|
||||||
|
gpio_pin_write(rst_dev, GPIO_RESET_PIN, 1);
|
||||||
|
|
||||||
|
/* Device will let us know when it's ready */
|
||||||
|
k_sem_take(&sem_initialised, K_FOREVER);
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static struct bt_hci_driver drv = {
|
||||||
|
.name = "BT SPI",
|
||||||
|
.bus = BT_HCI_DRIVER_BUS_SPI,
|
||||||
|
.open = bt_spi_open,
|
||||||
|
.send = bt_spi_send,
|
||||||
|
};
|
||||||
|
|
||||||
|
static int _bt_spi_init(struct device *unused)
|
||||||
|
{
|
||||||
|
ARG_UNUSED(unused);
|
||||||
|
|
||||||
|
spi_dev = device_get_binding(CONFIG_BLUETOOTH_SPI_DEV_NAME);
|
||||||
|
if (!spi_dev) {
|
||||||
|
BT_ERR("Failed to initialize SPI driver: %s",
|
||||||
|
CONFIG_BLUETOOTH_SPI_DEV_NAME);
|
||||||
|
return -EIO;
|
||||||
|
}
|
||||||
|
|
||||||
|
cs_dev = device_get_binding(CONFIG_BLUETOOTH_SPI_CHIP_SELECT_DEV_NAME);
|
||||||
|
if (!cs_dev) {
|
||||||
|
BT_ERR("Failed to initialize GPIO driver: %s",
|
||||||
|
CONFIG_BLUETOOTH_SPI_CHIP_SELECT_DEV_NAME);
|
||||||
|
return -EIO;
|
||||||
|
}
|
||||||
|
|
||||||
|
irq_dev = device_get_binding(CONFIG_BLUETOOTH_SPI_IRQ_DEV_NAME);
|
||||||
|
if (!irq_dev) {
|
||||||
|
BT_ERR("Failed to initialize GPIO driver: %s",
|
||||||
|
CONFIG_BLUETOOTH_SPI_IRQ_DEV_NAME);
|
||||||
|
return -EIO;
|
||||||
|
}
|
||||||
|
|
||||||
|
rst_dev = device_get_binding(CONFIG_BLUETOOTH_SPI_RESET_DEV_NAME);
|
||||||
|
if (!rst_dev) {
|
||||||
|
BT_ERR("Failed to initialize GPIO driver: %s",
|
||||||
|
CONFIG_BLUETOOTH_SPI_RESET_DEV_NAME);
|
||||||
|
return -EIO;
|
||||||
|
}
|
||||||
|
|
||||||
|
bt_hci_driver_register(&drv);
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
SYS_INIT(_bt_spi_init, POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEVICE);
|
Loading…
Add table
Add a link
Reference in a new issue