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

本文转载自：http://blog.csdn.net/kris_fei/article/details/76919134

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),
};

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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;

}

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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。