[RK3288] [Android6.0] Debug Notes---PMU (rk818) register read and write "Turn"

This article was reproduced from: http://blog.csdn.net/kris_fei/article/details/76919134

Platform:rockchip
Os:android 6.0
kernel:3.10.92

RK's PMU module only provides read and write for each individual register, and the driver provides this node for use:/sys/rk818/rk818_test
Example:

• Read:

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

• Write:

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

Code Implementation section:
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,ConstChar *buf, size_t N) {u32 getdata[8];    U8 regaddr; U8 data;char cmd;Constchar *buftmp = BUF; struct rk818 *rk818 = g_rk818;/** * W Addr (8Bit) regaddr (8Bit) data0 (8Bit) data1 (8Bit) data2 (8Bit) data3 (8Bit) *:d ATA can is less than 4 byte * R Regad DR (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, 0]); PRINTK ( "cmd:%c%x\n", cmd, Getdata[0]); regaddr = (U8) (getdata[< Span class= "Hljs-number" >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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If you want to implement all register dumps, you can add an option, like other PMU module methods.

[RK3288] [Android6.0] Debug Notes---PMU (rk818) register read and write "Turn"