[RK3288][Android6.0] 调试笔记 --- pmu(rk818)寄存器读写

Platform: Rockchip
OS: Android 6.0
Kernel: 3.10.92

rk的pmu模块只提供了每次单个寄存器的读写，驱动提供了这个节点供使用：/sys/rk818/rk818_test
举例：

• 读取：

echo r 0x23 > /sys/rk818/rk818_test: 读取地址 0x23 的值，r 表示读；

• 写入：

echo w 0x23 0x7f > /sys/rk818/rk818_test: 对地址 0x23 赋值为 0x7f, w 表示写。

---

代码实现部分：
rk818.c

static struct rk818_attribute rk818_attrs[] = {    /*     node_name    permision       show_func   store_func */    __ATTR(rk818_test,  S_IRUGO | S_IWUSR,  rk818_test_show,    rk818_test_store),};

static ssize_t rk818_test_store(struct kobject *kobj, struct kobj_attribute *attr,                                const char *buf, size_t n){    u32 getdata[8];    u8 regAddr;    u8 data;    char cmd;    const char *buftmp = buf;    struct rk818 *rk818 = g_rk818;    /**     * W Addr(8Bit) regAddr(8Bit) data0(8Bit) data1(8Bit) data2(8Bit) data3(8Bit)     *      :data can be less than 4 byte     * R regAddr(8Bit)     * C gpio_name(poweron/powerhold/sleep/boot0/boot1) value(H/L)     */    sscanf(buftmp, "%c ", &cmd);    printk("------zhangqing: get cmd = %c\n", cmd);    switch (cmd) {    case 'w':        sscanf(buftmp, "%c %x %x ", &cmd, &getdata[0], &getdata[1]);        regAddr = (u8)(getdata[0] & 0xff);        data = (u8)(getdata[1] & 0xff);        printk("get value = %x\n", data);        rk818_i2c_write(rk818, regAddr, 1, data);        rk818_i2c_read(rk818, regAddr, 1, &data);        printk("%x   %x\n", getdata[1], data);        break;    case 'r':        sscanf(buftmp, "%c %x ", &cmd, &getdata[0]);        printk("CMD : %c %x\n", cmd, getdata[0]);        regAddr = (u8)(getdata[0] & 0xff);        rk818_i2c_read(rk818, regAddr, 1, &data);        printk("%x %x\n", getdata[0], data);        break;    default:        printk("Unknown command\n");        break;    }    return n;}

如果要实现所有寄存器dump,可以添加一个选项，其他pmu模块方法一样。