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RK3399
回帖（1）
2022-3-7 10:35:58
static struct kobject *rk8xx_kobj;
static struct device_attribute rk8xx_attrs =
__ATTR(rk8xx_dbg, 0200, NULL, rk8xx_dbg_store);
rk8xx_dbg：是操作的文件
0200 ：权限
NULL : 显示函数，cat该文件时，此函数被调用。
rk8xx_dbg_store：写函数，echo内容到该文件时，此函数被调用。
创建文件操作的文件
rk8xx_kobj = kobject_create_and_add("rk8xx", NULL);
if (rk8xx_kobj) {
ret = sysfs_create_file(rk8xx_kobj, &rk8xx_attrs.attr);
if (ret)
dev_err(&client->dev, "create rk8xx sysfs errorn");
}
static ssize_t rk8xx_dbg_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
int ret;
char cmd;
u32 input[2], addr, data;
struct rk808 *rk808 = i2c_get_clientdata(rk808_i2c_client);
ret = sscanf(buf, "%c ", &cmd);
switch (cmd) {
case 'w':
ret = sscanf(buf, "%c %x %x ", &cmd, &input[0], &input[1]);
if (ret != 3) {
pr_err("erro! cmd format: echo w [addr] [value]n");
goto out;
}
addr = input[0] & 0xff;
data = input[1] & 0xff;
pr_info("cmd : %c %x %xnn", cmd, input[0], input[1]);
regmap_write(rk808->regmap, addr, data);
regmap_read(rk808->regmap, addr, &data);
pr_info("new: %x %xn", addr, data);
break;
case 'r':
ret = sscanf(buf, "%c %x ", &cmd, &input[0]);
if (ret != 2) {
pr_err("erro! cmd format: echo r [addr]n");
goto out;
}
pr_info("cmd : %c %xnn", cmd, input[0]);
addr = input[0] & 0xff;
regmap_read(rk808->regmap, addr, &data);
pr_info("%x %xn", input[0], data);
break;
default:
pr_err("Unknown commandn");
break;
}
out:
return count;
}
有关kobj,kobject后面有机会单独分析
static struct kobject *rk8xx_kobj;
static struct device_attribute rk8xx_attrs =
__ATTR(rk8xx_dbg, 0200, NULL, rk8xx_dbg_store);
rk8xx_dbg：是操作的文件
0200 ：权限
NULL : 显示函数，cat该文件时，此函数被调用。
rk8xx_dbg_store：写函数，echo内容到该文件时，此函数被调用。
创建文件操作的文件
rk8xx_kobj = kobject_create_and_add("rk8xx", NULL);
if (rk8xx_kobj) {
ret = sysfs_create_file(rk8xx_kobj, &rk8xx_attrs.attr);
if (ret)
dev_err(&client->dev, "create rk8xx sysfs errorn");
}
static ssize_t rk8xx_dbg_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
int ret;
char cmd;
u32 input[2], addr, data;
struct rk808 *rk808 = i2c_get_clientdata(rk808_i2c_client);
ret = sscanf(buf, "%c ", &cmd);
switch (cmd) {
case 'w':
ret = sscanf(buf, "%c %x %x ", &cmd, &input[0], &input[1]);
if (ret != 3) {
pr_err("erro! cmd format: echo w [addr] [value]n");
goto out;
}
addr = input[0] & 0xff;
data = input[1] & 0xff;
pr_info("cmd : %c %x %xnn", cmd, input[0], input[1]);
regmap_write(rk808->regmap, addr, data);
regmap_read(rk808->regmap, addr, &data);
pr_info("new: %x %xn", addr, data);
break;
case 'r':
ret = sscanf(buf, "%c %x ", &cmd, &input[0]);
if (ret != 2) {
pr_err("erro! cmd format: echo r [addr]n");
goto out;
}
pr_info("cmd : %c %xnn", cmd, input[0]);
addr = input[0] & 0xff;
regmap_read(rk808->regmap, addr, &data);
pr_info("%x %xn", input[0], data);
break;
default:
pr_err("Unknown commandn");
break;
}
out:
return count;
}
有关kobj,kobject后面有机会单独分析
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