Android bcm4330 Bluetooth BT driver debugging record

There are very few BT drivers on the Internet, so I recorded the steps during the development process. For mutual learning and discussion.

1. Migration of Bt DRIVER:

1. enableeffectch in boadconfig. mk

Board_have_bluetooth: = true

2. Implement rfkill driver for BT power management.

Kernel/driver/Bluetooth/bluetooth-power.c Qualcomm this file basically does not need to be moved.

In kernel \ arch \ Arm \ mach_msm7x27.c: static int rjth_power (INT on)

Implementation: power-on: Low bt_reset pin and bt_reg_on pin

Mdelay (10 );

Increase bt_resetpin and bt_reg_on pin

Mdelay (150)

Power-off: lower bt_reset pin and bt_reg_on pin

 

3. rebuildandroid image and reboot

Command Line test:

Echo 0>/sys/class/rfkill/rfkill0/State // BT power-off

Echo 1>/sys/class/rfkill/rfkill0/State // BT power-on

Brcm_patchram_plus-d -- patchram/etc/firmware/bcm4329b0000002.002.023.0061.0062.hcd/dev/ttyhs0

Hciattach-s115200/dev/ttyhs0 any

If no error message is displayed, use the following test:

Hciconfig hci0up

Hcitool Scan

 

4. Implement BT sleep wake-up Mechanism

Kernel \ drivers \ Bluetooth \ bluesleep. c In general, this file is slightly changed, but it may be logically problematic. Small changes are required.

In kernel \ arch \ Arm \ mach_xxx/board_xxx.c: bluesleep_resources, define gpio_host_wake (BT wake-up host foot), gpio_ext_wake (host wake-up BT foot), and host_wake (BT wake-up ).

Note: The board_xxx.c files of different platforms have different names. Please confirm

5. System Integration

1) Check the following content in init. qcom. RC:

Service hciattach/system/bin/sh/system/etc/init. qcom. bt. Sh

User Bluetooth

Group qcom_oncrpc Bluetooth net_bt_admin

Disabled

Oneshot

 

2) Modify init. qcom. bt. Sh.

Confirmation:

Export th_sleep_path =/proc/Bluetooth/sleep/proto

Echo 1> $ th_sleep_path

/System/bin/hciattach-N/dev/ttyhs0 any 3000000 flow & changed:

./Brcm_patchram_plus -- enable_lpm-enable_hci -- patchram/system/etc/WiFi/bcm4329bt. HCD -- baudrate3000000/dev/ttyhs0 &

Note: Qualcomm downloads the firmware command.

 

6. recompile the system. Now BT should be able to run.

Ii. BT sleep wake-up configuration

BT sleep in Driver/Bluetooth/bluesleep. in C, the first driver name is "bluesleep" and arch/ARM/Mach-MSM/board-msm7x30.c match to execute platform_driver_probe (& bluesleep_driver, bluesleep_probe) call static int _ init bluesleep_probe (struct platform_device * pdev). Two pins host_wake_bt & bt_wake_host will be configured here.

BSI = kzarloc (sizeof (struct bluesleep_info), gfp_kernel );
If (! BSI)
Return-enomem;

Res = platform_get_resource_byname (pdev, ioresource_io,
"Gpio_host_wake ");
If (! Res ){
Bt_err ("couldn't find host_wake gpio \ n ");
Ret =-enodev;
Goto free_bsi;
}
BSI-> host_wake = res-> start;
// [SIMT-zhangmin-111230] change the configuration of Bt sleep gpio from bt_power to here {
Gpio_tlmm_config (gpio_cfg (BSI-> host_wake, 0, gpio_cfg_input, gpio_cfg_no_pull, gpio_cfg_2ma), gpio_cfg_enable );
// [SIMT-zhangmin-111230]}
Ret = gpio_request (BSI-> host_wake, "bt_host_wake ");
If (RET)
Goto free_bsi;
Ret = gpio_direction_input (BSI-> host_wake );

BSI-> host_wake_irq = platform_get_irq_byname (pdev, "host_wake ");

As shown in the above Code, we mainly set host_wake_bt to the output foot, bt_wake_host to the input foot, and bt_wake_host to the center broken foot, waiting for the BT chip to wake up.

Then, create the BT directory/proc/Bluetooth/sleep/read the host_wake_bt status in btwake in the bluesleep_init function. The read status value is 0 or 1.

Or in the BT directory/proc/Bluetooth/sleep/write the host_wake_bt status in btwake. The write status value is 0 or 1.