linux驱动板载信息注册

来源：互联网发布：公务员恋爱知乎编辑：程序博客网时间：2024/05/22 14:39

一、定义板载信息数组

static struct i2c_board_info i2c_devs3[] __initdata = {    /* add by cym 20130318 support for FT5X0X TouchScreen */    #if defined(CONFIG_TOUCHSCREEN_FT5X0X)    {        I2C_BOARD_INFO("ft5x0x_ts", 0x70>>1),        .irq = IRQ_EINT(4),        .platform_data = &ft5x0x_pdata,    },}

二、注册板载信息

i2c_register_board_info(3, i2c_devs3, ARRAY_SIZE(i2c_devs3));

三、注册板载信息的函数实现

int __initi2c_register_board_info(int busnum,    struct i2c_board_info const *info, unsigned len){    int status;    down_write(&__i2c_board_lock);    /* dynamic bus numbers will be assigned after the last static one */    if (busnum >= __i2c_first_dynamic_bus_num)        __i2c_first_dynamic_bus_num = busnum + 1;    for (status = 0; len; len--, info++) {        struct i2c_devinfo  *devinfo;        devinfo = kzalloc(sizeof(*devinfo), GFP_KERNEL);        if (!devinfo) {            pr_debug("i2c-core: can't register boardinfo!\n");            status = -ENOMEM;            break;        }        devinfo->busnum = busnum;        devinfo->board_info = *info;        list_add_tail(&devinfo->list, &__i2c_board_list);    }    up_write(&__i2c_board_lock);    return status;}

0 0