qcom platform 子系统(3)

来源：互联网发布：中国移动摇话费软件编辑：程序博客网时间：2024/05/22 09:00

/******************************************************************************/
/*怎样重启子系统？*/
/******************************************************************************/
root@gemini:/sys/kernel/debug/msm_subsys # ls -al
-rw-r--r-- root root 0 1970-01-01 08:00 AR6320
-rw-r--r-- root root 0 1970-01-01 08:00 a530_zap
-rw-r--r-- root root 0 1970-01-01 08:00 adsp
-rw-r--r-- root root 0 1970-01-01 08:00 modem
-rw-r--r-- root root 0 1970-01-01 08:00 slpi
-rw-r--r-- root root 0 1970-01-01 08:00 venus
static ssize_t subsys_debugfs_read(struct file *filp, char __user *ubuf,
size_t cnt, loff_t *ppos)
{
int r;
char buf[40];
struct subsys_device *subsys = filp->private_data;

r = snprintf(buf, sizeof(buf), "%d\n", subsys->count);
return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
}

static ssize_t subsys_debugfs_write(struct file *filp,
const char __user *ubuf, size_t cnt, loff_t *ppos)
{
struct subsys_device *subsys = filp->private_data;
char buf[10];
char *cmp;

cnt = min(cnt, sizeof(buf) - 1);
if (copy_from_user(&buf, ubuf, cnt))
return -EFAULT;
buf[cnt] = '\0';
cmp = strstrip(buf);

if (!strcmp(cmp, "restart")) {
if (subsystem_restart_dev(subsys))
return -EIO;
} else if (!strcmp(cmp, "get")) {
if (subsystem_get(subsys->desc->name))
return -EIO;
} else if (!strcmp(cmp, "put")) {
subsystem_put(subsys);
} else {
return -EINVAL;
}

return cnt;

}

echo "restart" > xxxx

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