linux内核中的MFD子系统【转】

struct mfd_cell {
    const char      *name;
    int         id;

    /* refcounting for multiple drivers to use a single cell */
    atomic_t        *usage_count;
    int         (*enable)(struct platform_device *dev);
    int         (*disable)(struct platform_device *dev);

    int         (*suspend)(struct platform_device *dev);
    int         (*resume)(struct platform_device *dev);

    /* platform data passed to the sub devices drivers */
    void            *platform_data;
    size_t          pdata_size;

    /* device properties passed to the sub devices drivers */
    struct property_entry *properties;

    /*  
     * Device Tree compatible string
     * See: Documentation/devicetree/usage-model.txt Chapter 2.2 for details
     */
    const char      *of_compatible;

    /* Matches ACPI */
    const struct mfd_cell_acpi_match    *acpi_match;

    /*  
     * These resources can be specified relative to the parent device.
     * For accessing hardware you should use resources from the platform dev
     */
    int         num_resources;
    const struct resource   *resources;

    /* don‘t check for resource conflicts */
    bool            ignore_resource_conflicts;

    /*  
     * Disable runtime PM callbacks for this subdevice - see
     * pm_runtime_no_callbacks().
     */
    bool            pm_runtime_no_callbacks;

    /* A list of regulator supplies that should be mapped to the MFD
     * device rather than the child device when requested
     */
    const char * const  *parent_supplies;
    int         num_parent_supplies;
};

static const struct mfd_cell tps6507x_devs[] = { 
    {   
        .name = "tps6507x-pmic",
    },  
    {   
        .name = "tps6507x-ts",
    },  
};

static struct i2c_driver tps6507x_i2c_driver = {
    .driver = {
           .name = "tps6507x",
           .of_match_table = of_match_ptr(tps6507x_of_match),
    },
    .probe = tps6507x_i2c_probe,
    .id_table = tps6507x_i2c_id,
};

struct tps6507x_dev {
    struct device *dev;
    struct i2c_client *i2c_client;
    int (*read_dev)(struct tps6507x_dev *tps6507x, char reg, int size,
            void *dest);
    int (*write_dev)(struct tps6507x_dev *tps6507x, char reg, int size,
             void *src);

    /* Client devices */
    struct tps6507x_pmic *pmic;
};

　　　　　　　　　　　　　　static struct regulator_ops tps6507x_pmic_ops = { 
    　　　　　　　　　　　　　　.is_enabled = tps6507x_pmic_is_enabled, 检查tps6507x的pmic功能是否已经使能了
    　　　　　　　　　　　　　　.enable = tps6507x_pmic_enable, 使能tps6507x的pmic功能
    　　　　　　　　　　　　　　.disable = tps6507x_pmic_disable, 禁用tsp6507x的pmic功能
    　　　　　　　　　　　　　　.get_voltage_sel = tps6507x_pmic_get_voltage_sel, 获取电压值
   　　　　　　　　　　　　　　 .set_voltage_sel = tps6507x_pmic_set_voltage_sel, 设置电压值
    　　　　　　　　　　　　　　.list_voltage = regulator_list_voltage_table, 列出电压表
    　　　　　　　　　　　　　　.map_voltage = regulator_map_voltage_ascend,
　　　　　　　　　　　　　　};

static const struct mfd_cell da9063_common_devs[] = { 
    {   
        .name       = DA9063_DRVNAME_REGULATORS,
        .num_resources  = ARRAY_SIZE(da9063_regulators_resources),
        .resources  = da9063_regulators_resources,
    },  
    {   
        .name       = DA9063_DRVNAME_LEDS,
    },  
    {   
        .name       = DA9063_DRVNAME_WATCHDOG,
        .of_compatible  = "dlg,da9063-watchdog",
    },  
    {   
        .name       = DA9063_DRVNAME_HWMON,
        .num_resources  = ARRAY_SIZE(da9063_hwmon_resources),
        .resources  = da9063_hwmon_resources,
    },  
    {   
        .name       = DA9063_DRVNAME_ONKEY,
        .num_resources  = ARRAY_SIZE(da9063_onkey_resources),
        .resources  = da9063_onkey_resources,
        .of_compatible = "dlg,da9063-onkey",
    },  
    {
        .name       = DA9063_DRVNAME_VIBRATION,
    },
};

/* Only present on DA9063 , not on DA9063L */
static const struct mfd_cell da9063_devs[] = {
    {
        .name       = DA9063_DRVNAME_RTC,
        .num_resources  = ARRAY_SIZE(da9063_rtc_resources),
        .resources  = da9063_rtc_resources,
        .of_compatible  = "dlg,da9063-rtc",
    },
};

struct da9063 {
    /* Device */
    struct device   *dev;
    enum da9063_type type;
    unsigned char   variant_code;
    unsigned int    flags;

    /* Control interface */
    struct regmap   *regmap;

    /* Interrupts */
    int     chip_irq;
    unsigned int    irq_base;
    struct regmap_irq_chip_data *regmap_irq;
};