wl12xx platform data

最新推荐文章于 2018-10-11 09:08:58 发布

原创最新推荐文章于 2018-10-11 09:08:58 发布 · 1k 阅读

1 ·

CC 4.0 BY-SA版权

文章标签：

#struct #delay #module #input

WIFI 专栏收录该内容

6 篇文章

订阅专栏

本文介绍了WL1271无线模块在OMAP3EVM开发板上的平台数据配置过程，包括platform_data的初始化、电源管理和中断设置等关键步骤。

wl1271的 platform_data 在/arch/arm/mach-omap2/board-xx.c中：

1. platform_data 初始化：

#ifdef CONFIG_WL12XX_PLATFORM_DATA
    //Adlink SP-10W61
    #define OMAP3EVM_WLAN_PMENA_GPIO (61)       //定义了2个专用gpio
    #define OMAP3EVM_WLAN_IRQ_GPIO (10)
    static struct regulator_consumer_supply omap3evm_vmmc2_supply =    //电源管理相关
        REGULATOR_SUPPLY("vmmc", "mmci-omap-hs.1");
    /* VMMC2 for driving the WL12xx module */
    static struct regulator_init_data omap3evm_vmmc2 = {
        .constraints = {
            .valid_ops_mask = REGULATOR_CHANGE_STATUS,
        },
        .num_consumer_supplies = 1,                                //一个电源供电：vmmc
        .consumer_supplies = &omap3evm_vmmc2_supply,
    };
    static struct fixed_voltage_config omap3evm_vwlan = {            //wlan voltage相关
        .supply_name = "vwl1271",
        .microvolts = 1800000, /* 1.80V */
        .gpio = OMAP3EVM_WLAN_PMENA_GPIO,
        .startup_delay = 70000, /* 70ms */
        .enable_high = 1,
        .enabled_at_boot = 0,
        .init_data = &omap3evm_vmmc2,
    };
    static struct platform_device omap3evm_wlan_regulator = {      //platform 终于浮出水面了
        .name = "reg-fixed-voltage",
        .id = 1,
        .dev = {
            .platform_data = &omap3evm_vwlan,
        },
    };
    struct wl12xx_platform_data omap3evm_wlan_data __initdata = {
        .irq = OMAP_GPIO_IRQ(OMAP3EVM_WLAN_IRQ_GPIO),              //中断号irq赋值
        .board_ref_clock = WL12XX_REFCLOCK_38, /* 38.4 MHz */      //时钟，wl12xx时钟源
    };
    #endif

2. 注册platform driver:

#ifdef CONFIG_WL12XX_PLATFORM_DATA
        omap_mux_init_gpio(61, OMAP_PIN_INPUT_PULLUP); // Adlink SP-10W61
        /* WL12xx WLAN Init */
        if (wl12xx_set_platform_data(&omap3evm_wlan_data))      //把omap3evm_wlan_data，复制给platform_data
            pr_err("error setting wl12xx data\n");
        platform_device_register(&omap3evm_wlan_regulator);      //注册platform设备。
    #endif

3. wl12xx_set_platform_data() 和 wl12xx_get_platform_data()：
代码在drivers/net/wireless/wl12xx/wl12xx_platform_data.c中。
config中需要配置wl1271_platform_data选项：

#include <linux/module.h>
    #include <linux/err.h>
    #include <linux/wl12xx.h>
    static const struct wl12xx_platform_data *platform_data;
        
    int __init wl12xx_set_platform_data(const struct wl12xx_platform_data *data)
    {
        if (platform_data)
            return -EBUSY;
        if (!data)
            return -EINVAL;
        
        platform_data = kmemdup(data, sizeof(*data), GFP_KERNEL);    //复制内存
        if (!platform_data)
            return -ENOMEM;
        
        return 0;
    }
    const struct wl12xx_platform_data *wl12xx_get_platform_data(void)
    {
        if (!platform_data)
            return ERR_PTR(-ENODEV);
        
        return platform_data;                     //得到这里的全局变量platform_data.
    }
    EXPORT_SYMBOL(wl12xx_get_platform_data);