android4.4移植到5.1.1遇到的问题

公司平板项目从android4.4（linux kernel V3.8）环境升级到5.1.1(linux kernel V3.10)，有不少框架发生了改变，我是偏驱动的，在此做记录，想到哪写到哪。

kernel

1. __devXXX

大约包括__devinit, __devinitdata, __devinitconst, __devexit, __devexitdata, __devexitconst
在移植aw2013指示灯芯片及max7359键盘芯片时，碰到error
expected ‘=’ ‘ ’ ‘ ’ ‘asm’ or ‘__attribute__’ before这样的错误。网上解释如下：

具体可以参考：

a whole set of __dev... macros are no longer used or defined Here is the list: __devinit, __devinitdata, __devinitconst, __devexit, __devexitdata, __devexitconst background: These attributes were used on certain driver functions and data declarations, putting
them in a separate section that could be discarded under certain circumstances. This functionality is no longer relevant, and the macros were removed in version 3.8 of the kernel. The macros should no longer be used. Just remove the attributes any place they
are used. see this commit: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=54b956b903607
解决办法：

删除或者重新define为空(如#define __devinit)

2. IDR

移植电量计碰到。

API发生了改变

解决1：用新的API代替

对于电池：

以前（linux v3.8）

/* If the system has several batteries we need a different name for each
* of them...
*/
static DEFINE_IDR(battery_id);
static DEFINE_MUTEX(battery_mutex);

/* Get new ID for the new battery device */
retval = idr_pre_get(&battery_id, GFP_KERNEL);
if (retval == 0)
return -ENOMEM;
mutex_lock(&battery_mutex);
retval = idr_get_new(&battery_id, client, &num);
mutex_unlock(&battery_mutex);

//移除
mutex_lock(&battery_mutex);
idr_remove(&battery_id, num);
mutex_unlock(&battery_mutex);

现在（linux v3.10）

/* If the system has several batteries we need a different name for each
* of them...
*/
//定义id
static DEFINE_IDR(battery_id);
static DEFINE_MUTEX(battery_mutex);

/* Get new ID for the new battery device */
/*_________<span style="color:#ff0000;">linux v3.8</span>__________*/
//retval = idr_pre_get(&battery_id, GFP_KERNEL);//保留资源
//if (retval == 0)
//	return -ENOMEM;
//mutex_lock(&battery_mutex);
//retval = idr_get_new(&battery_id, client, &num);//申请id
//mutex_unlock(&battery_mutex);

/*_________<span style="color:#ff0000;">linux v3.10</span>__________*/
mutex_lock(&battery_mutex);
num = idr_alloc(&battery_id, client, 0, 0, GFP_KERNEL);
mutex_unlock(&battery_mutex);

//移除id
mutex_lock(&battery_mutex);
idr_remove(&battery_id, num);
mutex_unlock(&battery_mutex);

解决2：在驱动.c包含idr.h前做如下处理

#undef
__deprecated

#define __deprecated

#include <linux/idr.h>

3. earlysuspend移除

将#include <linux/earlysuspend.h>以及
CONFIG_HAS_EARLYSUSPEND等相关代码移除