MSM7227A使用gpio-I2C的修改点

 （scene：蓝牙设备使用了普通gpio来模拟i2c接口，使用了管脚76和80）

1.       Modem部分

修改文件：

1)       TLMMBspMsm_XXX.h

该文件定义了各个gpio的默认设置，如是否上拉，需要确认

BSP_GPIO_OUT_76 = GPIO_CFG(76, 0, BSP_GPIO_OUTPUT, BSP_GPIO_NO_PULL, BSP_GPIO_2MA, RMT_TO_ALL),

BSP_GPIO_OUT_80 = GPIO_CFG(80, 0, BSP_GPIO_OUTPUT, BSP_GPIO_NO_PULL, BSP_GPIO_2MA, RMT_TO_ALL),

 

2)       TLMMBsp_XXX.c

将SLEEP_CONFIGS中的gpio编号设置为0xFF

uint32 SLEEP_CONFIGS[TLMM_BSP_NUM_GPIO] =

{

// GPIO_CFG(76, 0, BSP_GPIO_INPUT, BSP_GPIO_PULL_DOWN, BSP_GPIO_2MA, HAL_TLMM_OUTPUT_LOW),     /* 76    */ //GPIO_CFG(80, 0, BSP_GPIO_INPUT, BSP_GPIO_PULL_DOWN, BSP_GPIO_2MA, HAL_TLMM_OUTPUT_LOW),            /* 80    */

GPIO_CFG(0xFF, 0, BSP_GPIO_INPUT, BSP_GPIO_PULL_DOWN, BSP_GPIO_2MA, HAL_TLMM_OUTPUT_LOW),               /* 76    */        

    GPIO_CFG(0xFF, 0, BSP_GPIO_OUTPUT, BSP_GPIO_NO_PULL, BSP_GPIO_2MA, HAL_TLMM_OUTPUT_LOW),      /*80*/     

}

将PRIMARY_CONFIGS中的对应管脚设置为输出

uint32 PRIMARY_CONFIGS[TLMM_BSP_NUM_GPIO] =

{

BSP_GPIO_OUT_76,

BSP_GPIO_OUT_80,

}

将TLMM_OWNERS中对应的管脚设置为

TLMM_BSP_OwnerProcType TLMM_OWNERS[TLMM_BSP_NUM_GPIO] =

{

TLMM_OWNER_PERIPHERAL, /* 76  */

TLMM_OWNER_PERIPHERAL, /* 80  */

}

 

2.       AP部分

修改文件：

1）  Board-trebon.c 增加对应的device结构体（如蓝牙设备使用了普通gpio作为i2c接口）

/*

I2c-gpio.c文件中定义了名字为"i2c-gpio"的driver

static struct platform_driver i2c_gpio_driver = {

    .driver                            = {

                  .name = "i2c-gpio",

                  .owner              = THIS_MODULE,

    },

    .probe                             = i2c_gpio_probe,

    .remove                         = __devexit_p(i2c_gpio_remove),

};

*/

 

static struct i2c_gpio_platform_data bt_i2c_gpio_data = {

        .sda_pin    = GPIO_BT_SDA,  //GPIO_76设置gpio管脚

        .scl_pin    = GPIO_BT_SCL,  //GPIO_80

        .udelay             = 1,

};

 

static struct platform_device bt_i2c_gpio_device = { 

        .name       = "i2c-gpio", //这里的设备名和driver的名字保持一致

        .id     =  5,  //和其他设备共享一个以"i2c-gpio"为名字的driver, 这里和其他设备的id要不一样,如触摸屏可能是4

        .dev        = {

                      .platform_data  = &bt_i2c_gpio_data,

        },

};

 

将device加入到surf_ffa_devices列表里面

static struct platform_device *surf_ffa_devices[] __initdata = {

       &bt_i2c_gpio_device,

}

 

 

在i2c设备初始化函数msm_device_i2c_init()中加入初始化配置

static void __init msm_device_i2c_init(void)

{

         gpio_tlmm_config(GPIO_CFG(GPIO_BT_SDA, 0, GPIO_CFG_OUTPUT,

                                                  GPIO_CFG_PULL_UP, GPIO_CFG_2MA),GPIO_CFG_ENABLE);

        gpio_tlmm_config(GPIO_CFG(GPIO_BT_SCL, 0, GPIO_CFG_OUTPUT,

                                              GPIO_CFG_PULL_UP, GPIO_CFG_2MA),GPIO_CFG_ENABLE);

}