linux下一个iic驱动（按键+点灯）-互斥
一、前提：
硬件部分：
1. rk3399开发板，其中的某一路iic，这个作为总线的主控制器
2. gd32单片机，其中的某一路iic，从设备。主要是按键上报和灯的亮灭控制。（按键大约30个，灯在键的下面，对应有30个左右。）
3. iic主要的功能是两个部分，是主动上报按键值，和接收点灯命令（收到后需要发送应答）。
4. 该路iic总线上还有一个触摸屏的设备。（不在介绍范围，这个说明一下单片机端不能改为主设备，cpu改为从设备的原因）。
5.cpu与单片机之间有一个中断io引脚，用于有按键（或者应答）数据时，提示cpu（rk3399）的作用，低电平有效。
软件部分：
1.linux4.4.194的内核，arm64平台，自编ic驱动程序。
2.单片机也是自己做的iic程序，使用硬件iic，协议自定义，与驱动一致即可。（本文不介绍单片机的程序）。
3.数据帧的格式（前期已经定好，不再修改）：cpu（rk3399，下同）发送指令由5个字节组成，设备（单片机，下同）回复指令由7个字节组成。
cpu主动发送部分：
设备发送部分：
二、iic驱动基本思路和逻辑
1. 发送数据时，首先把数据组合好，调用i2c_master_send，完成发送。（比如点亮熄灭的命令）
i2c_master_send(s_jc_keyboard_info.i2c_client, (char *)&keyboard_send_msg, sizeof(KEYBOARD_I2C_SEND_MSG_S)) != sizeof(KEYBOARD_I2C_SEND_MSG_S)2.接收数据，单片机发送数据时，是肯定有一个中断触发cpu，所以cpu处理是在中断处理函数中。
收到中断后，考虑到iic的数据是串行通信，比较费时，所以采用工作队列的方式处理，收到中断，其实就是启动一次工作队列，这时使用了内核自己的队列。
队列启动后，使用i2c_master_recv接收数据，然后根据协议解析数据，完成相关的操作。
static irqreturn_t s_jc_keyboard_i2c_isr(int irq, void *dev_id)
{
if(irq != s_jc_keyboard_info.i2c_client->irq) {
return IRQ_NONE;
}
if(!schedule_work(&jc_keyboard_work)) {
pr_err("Error schedule_work!\n");
}
return IRQ_HANDLED;
}i2c_master_recv(s_jc_keyboard_info.i2c_client, (char *)&keyboard_recv_msg, sizeof(KEYBOARD_I2C_RECV_MSG_S)) != sizeof(KEYBOARD_I2C_RECV_MSG_S)三、一个互斥问题。
1. 有闪烁灯的控制，而且是多个灯的闪烁，频率
这种情况，cpu主动发送数据和设备应答的数据（cpu主动读取数据）比较多，每一次设备应答都会中断，中断比较频繁。
2.同时多次按键，组合键
这个情况下，中断比较多，cpu主要是读取数据。
3.确实有异常的表现，报出一些数据帧不能解析的错误，偶尔有按键不能正常上报按下和松开的状态。
4.客户在使用的时候，发现多个灯闪的时候，会出现比较大的卡顿现象（后来分析其实是命令丢失，就是第一个点亮或熄灭命令发了很久之后，才开始闪），同时按键也会出现失灵的现象（可能要多次按键才会作用）。
5. 不知道是不是频繁中断的影响，schedule_work偶尔也会报出错误提示，原因未知。
四、解决思路
1. 中断是个问题，cpu发送数据和接收数据的过程中是很有可能被中断打断的，这个打断会不会导致数据帧出现错误。尤其是有数据下发的点灯命令和频繁按键上报的情况。
2.点灯命令的应答和按键上报的中断同时（或者间隔很短的情况下）会如何？
3.加上互斥锁（iic_idel_Mutex），一个发送流程（包括发送和接收应答）走完，才能进行下一步操作。比如点灯，必须把数据发完，同时接收到应答（或者超时）才能发送下一帧数据。
4.第二把互斥锁（iic_Mutex，不知道是否多余），每一次发送和接收都加锁，接收发送函数结束后解锁。
5.加上自定义的一个工作队列，使用自己的工作队列处理中断事件。
五、加上锁后，基本解决这个问题。
详细请参考一下源代码（部分主要源码，h文件省略了）
/*
* jc_keyboard.c
*
* Created on: Dec 25, 2021
* Author: dazhi
*/
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include "jc_keyboard.h"
#include "jc_keyboard_cmd.h"
#include "jc_keyuser.h"
#define JC_KEYBOARD_DRIVER_NAME "jc_keyboard"
#define JC_KEYBOARD_IRQ_GPIO_NAME "jc_keyboard_irq_gpio"
#define JC_KEYBOARD_IRQ_NAME "jc_keyboard_irq"
#define JC_KEYBOARD_MISCDEV_MINOR (20)
#define JC_KEYBOARD_I2C_TIMEOUT (4000) //4000 --> 1s 2022-09-06 dazhi修改，客户处调试暂时已通过。
#define NO_POLL_MODE //不主动查询，需要单片机给出中断才行。
#define USE_SELF_WORK_QUEUE
//static int jc_keyboard_inited = -1; //是否加载成功，2023-01-09
#ifdef USE_SELF_WORK_QUEUE
//分配工作队列的指针
static struct workqueue_struct *jc_keyboard_wq;
#endif
static int debug_print = 0; //默认不打印调试语句
static struct mutex iic_Mutex; //互斥锁
static struct mutex iic_idel_Mutex; //iic空闲互斥锁
static volatile unsigned long wait_respon_bits = 0; //需要等待什么应答，每一个位对应一种需求
module_param(debug_print,int, 0644); //加载时传递参数
typedef struct {
int irq_gpio;
struct input_dev *input_dev;
struct i2c_client *i2c_client;
struct semaphore ioctl_sem;
} JC_KEYBOARD_INFO;
static char s_i2c_reply_ret = 0;
static struct miscdevice s_jc_keyboard_miscdevice;
static struct work_struct jc_keyboard_work;
static JC_KEYBOARD_INFO s_jc_keyboard_info;
//按键转换值的数组，定义在jc_keyuser.h
static const unsigned char s_user_key_value[] = {
0,
USER_KEY_VALUE_FUNCTION_1, //0x1
USER_KEY_VALUE_FUNCTION_2, //0x2
USER_KEY_VALUE_FUNCTION_3, //0x3
USER_KEY_VALUE_FUNCTION_4, //0x4
USER_KEY_VALUE_FUNCTION_5, //0x5
USER_KEY_VALUE_FUNCTION_6, //0x6
USER_KEY_VALUE_FUNCTION_7, //0x7
USER_KEY_VALUE_FUNCTION_8, //0x8
USER_KEY_VALUE_FUNCTION_9, //0x9
USER_KEY_VALUE_FUNCTION_10, //0xa
USER_KEY_VALUE_FUNCTION_11, //0xb
USER_KEY_VALUE_FUNCTION_12, //0xc
USER_KEY_VALUE_0, //索引号13 -- 数字0
USER_KEY_VALUE_1, //索引号14 -- 数字1
USER_KEY_VALUE_2, //索引号15 -- 数字2
USER_KEY_VALUE_3, //索引号16 -- 数字3
USER_KEY_VALUE_4, //索引号17 -- 数字4
USER_KEY_VALUE_5, //索引号18 -- 数字5
USER_KEY_VALUE_6, //索引号19 -- 数字6
USER_KEY_VALUE_7, //索引号20 -- 数字7
USER_KEY_VALUE_8, //索引号21 -- 数字8
USER_KEY_VALUE_9, //索引号22 -- 数字9
USER_KEY_VALUE_ASTERISK, //索引号23 --
USER_KEY_VALUE_POUND, //索引号24 --
USER_KEY_VALUE_TELL, //索引号25
USER_KEY_VALUE_VOLUME_INCREASE, //索引号26
USER_KEY_VALUE_VOLUME_DECREASE, //索引号27
USER_KEY_VALUE_SWITCH,
USER_KEY_VALUE_INSIDE,
USER_KEY_VALUE_OUTSIDE,
USER_KEY_VALUE_UP, //索引号31
USER_KEY_VALUE_DOWN, //索引号32
USER_KEY_VALUE_PTT, //索引号33
USER_KEY_VALUE_LEFT, //索引号34
USER_KEY_VALUE_RIGHT, //索引号35
USER_KEY_VALUE_OK, //索引号36
USER_KEY_VALUE_KEEP, //索引号37
USER_KEY_VALUE_SET, //索引号38
USER_KEY_VALUE_TEST //索引号39---> 0x27
};
//左侧（中括号中的数）是客户自动自定义的键值 比如KC_L1 --> 1
//右侧是s_user_key_value中对应值得索引号，比如数字0，在数组中排13，就是0xd，
static const unsigned char s_user_map_led_value[] = {
[1] = 0x01 , //图示1左1 //KC_L1 1
[3] = 0x02 , //图示2左2 //KC_L2 3
[5] = 0x03 , //图示3左3 //KC_L3 5
[7] = 0x04 , //图示4左4 //KC_L4 7
[9] = 0x05 , //图示5左5 //KC_L5 9
[44] = 0x06 , //图示6左6 //KC_L6 44
[2] = 0x07 , //图示7右1 //KC_R1 2
[4] = 0x08 , //图示8右2 //KC_R2 4
[6] = 0x09 , //图示9右3 //KC_R3 6
[8] = 0x0A , //图示10右4 //KC_R4 8
[10] = 0x0B , //图示11右5 //KC_R5 10
[45] = 0x0C , //图示12右6 //KC_R6 45
[27] = 0x0D , //0 //KC_NUM0 27
[18] = 0x0E , //1 //KC_NUM1 18
[19] = 0x0F , //2 //KC_NUM2 19
[20] = 0x10 , //3 //KC_NUM3 20
[21] = 0x11 , //4 //KC_NUM4 21
[22] = 0x12 , //5 //KC_NUM5 22
[23] = 0x13 , //6 //KC_NUM6 23
[24] = 0x14 , //7 //KC_NUM7 24
[25] = 0x15 , //8 //KC_NUM8 25
[26] = 0x16 , //9 //KC_NUM9 26
[28] = 0x17 , //* //KC_DOT 28
[29] = 0x18 , //# //KC_CLEAR 29
[13] = 0x19 , //电话（拨号） //KC_TEL 13
[35] = 0x1A , //音量+ //KC_VOLUME_UP 35
[36] = 0x1B , //音量- //KC_VOLUME_DOWN 36
[14] = 0x27 , //TEST //KC_TESKKEY 14 //原0x1c改0x27
[11] = 0x1D , //内通 //KC_INC 11
[12] = 0x1E , //外通 //KC_EXC 12
[30] = 0x1F , //上 //KC_UP 30
[31] = 0x20 , //下 //KC_DOWN 31
[17] = 0x21 , //PTT //KC_PTT 17
[32] = 0x22 , //左 //KC_LEFT 32
[33] = 0x23 , //右 //KC_FIGHT 33
[34] = 0x24 , //OK //KC_OK 34
[15] = 0x25 , //保持 //KC_HOLD 15
[43] = 0x26 , //设置/摘挂机 //KC_RECOV 16改成43 原来[16] = 0x26 ,
[42] = 0x27 , //测试/复位 //KC_xxx
[37] = 0x28 , //指示灯-红 //LED_RED 37
[38] = 0x29 , //指示灯-绿 //LED_GREEN 38
[39] = 0x2A , //指示灯-蓝 //KC_BLUE 39
[40] = 0x2B //全部键灯 //ALL_KEY_LED 40
};
static const struct of_device_id s_jc_keyboard_match_table[] = {
{ .compatible = "jc,keyboard", },
{},
};
static const struct i2c_device_id s_jc_keyboard_i2c_id[] = {
{ JC_KEYBOARD_DRIVER_NAME, 0},
{}
};
static void s_jc_keyboard_work_func_t(struct work_struct *work) {
KEYBOARD_I2C_RECV_MSG_S keyboard_recv_msg;
unsigned char i = 0;
unsigned char cmd_verify_tmp = 0;
// pr_err("2023debug s_jc_keyboard_work_func_t\n");
memset(&keyboard_recv_msg, 0, sizeof(KEYBOARD_I2C_RECV_MSG_S));
mutex_lock(&iic_Mutex); //加锁
if(i2c_master_recv(s_jc_keyboard_info.i2c_client, (char *)&keyboard_recv_msg, sizeof(KEYBOARD_I2C_RECV_MSG_S)) != sizeof(KEYBOARD_I2C_RECV_MSG_S)) {
pr_err("Error i2c_master_recv, addr = %#x\n", s_jc_keyboard_info.i2c_client->addr);
mutex_unlock(&iic_Mutex); //开锁
return;
}
mutex_unlock(&iic_Mutex); //开锁
if(debug_print)
pr_err("i2c_master_recv: h0 = %#x, h1 = %#x type = %#x, key0=%#x, key1=%#x，key2=%#x,verify=%#x\n",
keyboard_recv_msg.cmd_header0,
keyboard_recv_msg.cmd_header1,
keyboard_recv_msg.cmd_type,
keyboard_recv_msg.cmd_key0,
keyboard_recv_msg.cmd_key1,
keyboard_recv_msg.cmd_key2,
keyboard_recv_msg.cmd_verify);
cmd_verify_tmp = FRAME_VERIFY(
keyboard_recv_msg.cmd_header0,
keyboard_recv_msg.cmd_header1,
keyboard_recv_msg.cmd_type,
keyboard_recv_msg.cmd_key0,
keyboard_recv_msg.cmd_key1,
keyboard_recv_msg.cmd_key2);
if(keyboard_recv_msg.cmd_header0 != FRAME_HEADER_0 || keyboard_recv_msg.cmd_header1 != FRAME_HEADER_1) {
pr_err("Error recv cmd header: %#x %#x\n", keyboard_recv_msg.cmd_header0, keyboard_recv_msg.cmd_header1);
return;
}
if(keyboard_recv_msg.cmd_verify != cmd_verify_tmp) {
if(debug_print)
pr_err("Error verify %#x\n", keyboard_recv_msg.cmd_verify);
return;
}
if((keyboard_recv_msg.cmd_type & 0xfc) == FRAME_CMD_TYPE_KEY_LED_FLASH) //闪烁的指令
{
s_i2c_reply_ret = keyboard_recv_msg.cmd_key2;
clear_bit(KEY_LED_FLASH_RESPONSE_BIT, &wait_respon_bits); //置高某一位
up(&s_jc_keyboard_info.ioctl_sem);
return ;
}
// pr_err("2023debug s_jc_keyboard_work_func_t cmd_type = %d,cmd_key2 = %d\n",keyboard_recv_msg.cmd_type,keyboard_recv_msg.cmd_key2);
switch(keyboard_recv_msg.cmd_type) {
case FRAME_CMD_TYPE_GET_KEY_VALUE_REPLY_PRESS:
case FRAME_CMD_TYPE_GET_KEY_VALUE_REPLY_RELEASE:
if(s_jc_keyboard_info.input_dev) {
// unsigned char key;
unsigned char key_val[3] = {keyboard_recv_msg.cmd_key0,keyboard_recv_msg.cmd_key1,keyboard_recv_msg.cmd_key2};
if(debug_print)
pr_info("key1 = %d key2 = %d key3 = %d\n",key_val[0],key_val[1],key_val[2]);
for(i=0;(i<3);i++)
//for(i=0;(i<3) && key_val[i];i++)
{
//key = keyboard_recv_msg.cmd_key0? keyboard_recv_msg.cmd_key0:keyboard_recv_msg.cmd_key2;
if(key_val[i] < KEY_VALUE_FUNCTION_1 || key_val[i] > KEY_VALUE_TEST) {
continue;
// pr_err("Error key %#x out of range!\n", key_val[i]);
// break;
}
input_report_key(s_jc_keyboard_info.input_dev, s_user_key_value[key_val[i]], (keyboard_recv_msg.cmd_type == FRAME_CMD_TYPE_GET_KEY_VALUE_REPLY_PRESS)? 1:0);
}
input_sync(s_jc_keyboard_info.input_dev);
}
break;
case FRAME_CMD_TYPE_GET_BRIGHTNESS:
s_i2c_reply_ret = keyboard_recv_msg.cmd_key2;
clear_bit(BRIGHTNESS_RESPONSE_BIT, &wait_respon_bits); //清零某一位
up(&s_jc_keyboard_info.ioctl_sem);
break;
case FRAME_CMD_TYPE_GET_PANEL_MODEL:
s_i2c_reply_ret = keyboard_recv_msg.cmd_key2;
clear_bit(PANEL_MODEL_RESPONSE_BIT, &wait_respon_bits); //清零某一位
up(&s_jc_keyboard_info.ioctl_sem);
break;
case FRAME_CMD_TYPE_GET_PANEL_VER:
s_i2c_reply_ret = keyboard_recv_msg.cmd_key2;
clear_bit(PANEL_MODEL_RESPONSE_BIT, &wait_respon_bits); //清零某一位
up(&s_jc_keyboard_info.ioctl_sem);
break;
case FRAME_CMD_TYPE_SET_BRIGHTNESS:
s_i2c_reply_ret = keyboard_recv_msg.cmd_key2;
clear_bit(PANEL_MODEL_RESPONSE_BIT, &wait_respon_bits); //清零某一位
up(&s_jc_keyboard_info.ioctl_sem);
break;
case FRAME_CMD_TYPE_RESET:
s_i2c_reply_ret = keyboard_recv_msg.cmd_key2;
clear_bit(RESET_RESPONSE_BIT, &wait_respon_bits); //清零某一位
up(&s_jc_keyboard_info.ioctl_sem);
break;
case FRAME_CMD_TYPE_KEY_LED_ON:
s_i2c_reply_ret = keyboard_recv_msg.cmd_key2;
clear_bit(KEY_LED_ON_RESPONSE_BIT, &wait_respon_bits); //清零某一位
up(&s_jc_keyboard_info.ioctl_sem);
break;
case FRAME_CMD_TYPE_KEY_LED_OFF:
s_i2c_reply_ret = keyboard_recv_msg.cmd_key2;
clear_bit(KEY_LED_OFF_RESPONSE_BIT, &wait_respon_bits); //清零某一位
up(&s_jc_keyboard_info.ioctl_sem);
break;
default:
pr_err("Error non-supported cmd %#x\n", keyboard_recv_msg.cmd_type);
break;
}
}
#ifndef NO_POLL_MODE
//读取消息超时的处理
static int s_jc_keyboard_inttimeout_func_t(void) {
KEYBOARD_I2C_RECV_MSG_S keyboard_recv_msg;
unsigned char cmd_verify_tmp = 0;
// if(jc_keyboard_inited != 1) //驱动没有加载成功！！
// return -1;
// pr_err("2023debug s_jc_keyboard_inttimeout_func_t\n");
memset(&keyboard_recv_msg, 0, sizeof(KEYBOARD_I2C_RECV_MSG_S));
mutex_lock(&iic_Mutex); //加锁
if(i2c_master_recv(s_jc_keyboard_info.i2c_client, (char *)&keyboard_recv_msg, sizeof(KEYBOARD_I2C_RECV_MSG_S)) != sizeof(KEYBOARD_I2C_RECV_MSG_S)) {
pr_err("Error i2c_master_recv, addr = %#x\n", s_jc_keyboard_info.i2c_client->addr);
mutex_unlock(&iic_Mutex); //开锁
return -1;
}
mutex_unlock(&iic_Mutex); //开锁
cmd_verify_tmp = FRAME_VERIFY(
keyboard_recv_msg.cmd_header0,
keyboard_recv_msg.cmd_header1,
keyboard_recv_msg.cmd_type,
keyboard_recv_msg.cmd_key0,
keyboard_recv_msg.cmd_key1,
keyboard_recv_msg.cmd_key2);
if(keyboard_recv_msg.cmd_header0 != FRAME_HEADER_0 || keyboard_recv_msg.cmd_header1 != FRAME_HEADER_1) {
pr_err("Error recv cmd header: %#x %#x\n", keyboard_recv_msg.cmd_header0, keyboard_recv_msg.cmd_header1);
return -1;
}
if(keyboard_recv_msg.cmd_verify != cmd_verify_tmp) {
pr_err("Error verify %#x\n", keyboard_recv_msg.cmd_verify);
return -1;
}
switch(keyboard_recv_msg.cmd_type) {
case FRAME_CMD_TYPE_GET_KEY_VALUE_REPLY_PRESS:
case FRAME_CMD_TYPE_GET_KEY_VALUE_REPLY_RELEASE:
if(s_jc_keyboard_info.input_dev) {
unsigned char key = keyboard_recv_msg.cmd_key0? keyboard_recv_msg.cmd_key0:keyboard_recv_msg.cmd_key2;
if(key < KEY_VALUE_FUNCTION_1 || key > KEY_VALUE_TEST) {
pr_err("Error key %#x out of range!\n", key);
break;
}
input_report_key(s_jc_keyboard_info.input_dev, s_user_key_value[key], (keyboard_recv_msg.cmd_type == FRAME_CMD_TYPE_GET_KEY_VALUE_REPLY_PRESS)? 1:0);
input_sync(s_jc_keyboard_info.input_dev);
}
break;
case FRAME_CMD_TYPE_GET_BRIGHTNESS:
case FRAME_CMD_TYPE_GET_PANEL_MODEL:
case FRAME_CMD_TYPE_GET_PANEL_VER:
case FRAME_CMD_TYPE_SET_BRIGHTNESS:
case FRAME_CMD_TYPE_RESET:
case FRAME_CMD_TYPE_KEY_LED_ON:
case FRAME_CMD_TYPE_KEY_LED_OFF:
s_i2c_reply_ret = keyboard_recv_msg.cmd_key2;
// up(&s_jc_keyboard_info.ioctl_sem);
break;
default:
pr_err("Error non-supported cmd %#x\n", keyboard_recv_msg.cmd_type);
return -1;
}
return 0;
}
#endif
static irqreturn_t s_jc_keyboard_i2c_isr(int irq, void *dev_id)
{
if(irq != s_jc_keyboard_info.i2c_client->irq) {
return IRQ_NONE;
}
if(debug_print)
pr_err("enter jc_keyboard_i2c_isr\n");
#ifdef USE_SELF_WORK_QUEUE
//将自己的工作和自己的工作队列进行管理，然后再登记
if(!queue_work(jc_keyboard_wq, &jc_keyboard_work)) {
pr_err("Error queue_work 2023!\n");
}
#else
if(!schedule_work(&jc_keyboard_work)) {
pr_err("Error schedule_work!\n");
}
#endif
return IRQ_HANDLED;
}
static int s_jc_keyboard_irq_init(void) {
if(s_jc_keyboard_info.irq_gpio <= 0) {
pr_err("Error irq_gpio is %d\n", s_jc_keyboard_info.irq_gpio);
return -1;
}
if(s_jc_keyboard_info.i2c_client->irq <= 0) {
pr_err("Error irq is %d\n", s_jc_keyboard_info.i2c_client->irq);
return -1;
}
if(gpio_request(s_jc_keyboard_info.irq_gpio, JC_KEYBOARD_IRQ_GPIO_NAME)) {
pr_err("Error gpio_request %s\n", JC_KEYBOARD_IRQ_GPIO_NAME);
return -1;
}
if(gpio_direction_input(s_jc_keyboard_info.irq_gpio)) {
pr_err("Error gpio_direction_input %d\n", s_jc_keyboard_info.irq_gpio);
gpio_free(s_jc_keyboard_info.irq_gpio);
return -1;
}
INIT_WORK(&jc_keyboard_work, s_jc_keyboard_work_func_t);
#ifdef USE_SELF_WORK_QUEUE
//创建自己的工作队列和自己的内核线程
jc_keyboard_wq = create_workqueue("myjc_keyboard_wq");
#endif
if(request_irq(s_jc_keyboard_info.i2c_client->irq, s_jc_keyboard_i2c_isr, IRQF_TRIGGER_FALLING, JC_KEYBOARD_IRQ_NAME, NULL)) {
pr_err("Error request_irq!\n");
gpio_free(s_jc_keyboard_info.irq_gpio);
return -1;
}
return 0;
}
static int s_jc_keyboard_irq_exit(void) {
if(s_jc_keyboard_info.i2c_client->irq > 0) {
free_irq(s_jc_keyboard_info.i2c_client->irq, NULL);
}
if(s_jc_keyboard_info.irq_gpio > 0) {
gpio_free(s_jc_keyboard_info.irq_gpio);
}
#ifdef USE_SELF_WORK_QUEUE
//销毁自己的工作队列和内核线程
destroy_workqueue(jc_keyboard_wq);
#endif
return 0;
}
static int s_jc_keyboard_input_init(void) {
int i = 0;
if(s_jc_keyboard_info.input_dev) {
pr_err("Error input_dev is not null!\n");
return -1;
}
if(!(s_jc_keyboard_info.input_dev = input_allocate_device())) {
pr_err("Error input_allocate_device!\n");
return -1;
}
s_jc_keyboard_info.input_dev->name = JC_KEYBOARD_DRIVER_NAME;
for(i = KEY_VALUE_FUNCTION_1; i <= KEY_VALUE_TEST; i ++) {
input_set_capability(s_jc_keyboard_info.input_dev, EV_KEY, s_user_key_value[i]);
}
if(input_register_device(s_jc_keyboard_info.input_dev)) {
pr_err("Error input_register_device!\n");
input_free_device(s_jc_keyboard_info.input_dev);
s_jc_keyboard_info.input_dev = NULL;
return -1;
}
return 0;
}
static int s_jc_keyboard_input_exit(void) {
if(!s_jc_keyboard_info.input_dev) {
pr_err("Error input_dev is null!\n");
return -1;
}
input_unregister_device(s_jc_keyboard_info.input_dev);
input_free_device(s_jc_keyboard_info.input_dev);
s_jc_keyboard_info.input_dev = NULL;
return 0;
}
static long s_jc_keyboard_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long argv) {
KEYBOARD_I2C_SEND_MSG_S keyboard_send_msg;
if(debug_print)
pr_err("enter jc_keyboard_unlocked_ioctl\n");
// if(jc_keyboard_inited != 1) //驱动没有加载成功！！
// return -1;
if(_IOC_TYPE(cmd) != KEYBOARD_IOC_MAGIC) {
pr_err("Error cmd %d\n", cmd);
return -1;
}
memset(&keyboard_send_msg, 0, sizeof(KEYBOARD_I2C_SEND_MSG_S));
keyboard_send_msg.cmd_header0 = FRAME_HEADER_0;
keyboard_send_msg.cmd_header1 = FRAME_HEADER_1;
switch(cmd) {
case KEYBOARD_IOC_GET_BRIGHTNESS:
keyboard_send_msg.cmd_type = FRAME_CMD_TYPE_GET_BRIGHTNESS;
set_bit(BRIGHTNESS_RESPONSE_BIT, &wait_respon_bits); //置高某一位
break;
case KEYBOARD_IOC_SET_BRIGHTNESS:
if(!argv || copy_from_user(&keyboard_send_msg.cmd, (void *)argv, 1)) {
pr_err("Error copy_from_user!\n");
return -2;
}
if(keyboard_send_msg.cmd < FRAME_CMD_TYPE_SET_BRIGHTNESS_MIN || keyboard_send_msg.cmd > FRAME_CMD_TYPE_SET_BRIGHTNESS_MAX) {
pr_err("Error brightness out of range!\n");
return -3;
}
keyboard_send_msg.cmd_type = FRAME_CMD_TYPE_SET_BRIGHTNESS;
set_bit(SET_BRIGHTNESS_RESPONSE_BIT, &wait_respon_bits); //置高某一位
break;
case KEYBOARD_IOC_GET_PANEL_MODEL:
keyboard_send_msg.cmd_type = FRAME_CMD_TYPE_GET_PANEL_MODEL;
set_bit(PANEL_MODEL_RESPONSE_BIT, &wait_respon_bits); //置高某一位
break;
case KEYBOARD_IOC_GET_PANEL_VER:
keyboard_send_msg.cmd_type = FRAME_CMD_TYPE_GET_PANEL_VER;
set_bit(PANEL_VER_RESPONSE_BIT, &wait_respon_bits); //置高某一位
break;
case KEYBOARD_IOC_RESET:
keyboard_send_msg.cmd_type = FRAME_CMD_TYPE_RESET;
set_bit(RESET_RESPONSE_BIT, &wait_respon_bits); //置高某一位
break;
case KEYBOARD_IOC_KEY_LED_FLASH: //2023-04-28
{
unsigned char user_val = 0;
unsigned char flashtype = 0;
if(!argv || copy_from_user(&user_val, (void *)argv, 1)) {
pr_err("Error KEYBOARD_IOC_KEY_LED_FLASH copy_from_user!\n");
return -4;
}
keyboard_send_msg.cmd = s_user_map_led_value[user_val & 0x3f];//(user_val & 0x3f); //闪烁哪个灯
flashtype = ((user_val >> 6) & 0x3); //闪烁类型
keyboard_send_msg.cmd_type = FRAME_CMD_TYPE_KEY_LED_FLASH | flashtype; //发过去的命令是0x80，81，82，83
}
set_bit(KEY_LED_FLASH_RESPONSE_BIT, &wait_respon_bits); //置高某一位
break;
case KEYBOARD_IOC_KEY_LED_ON:
case KEYBOARD_IOC_KEY_LED_OFF: {
// int i = KEY_VALUE_FUNCTION_1;
unsigned char user_key_code = 0;
if(!argv || copy_from_user(&user_key_code, (void *)argv, 1)) {
pr_err("Error copy_from_user!\n");
return -5;
}
// for(; i < KEY_VALUE_TEST; i ++) {
// if(s_user_key_value[i] == user_key_code) {
// keyboard_send_msg.cmd = i;
// break;
// }
// }
if(user_key_code < sizeof(s_user_map_led_value)/sizeof(s_user_map_led_value[0]))
keyboard_send_msg.cmd = s_user_map_led_value[user_key_code];
else
keyboard_send_msg.cmd = 0; //20220905
//2023-01-05 不能识别的按键
if(keyboard_send_msg.cmd == 0){
pr_err("Error keyboard_send_msg.cmd == 0! user_key_code = %d\n",user_key_code);
return -6;
}
// if(i >= KEY_VALUE_TEST) {
// if(user_key_code >= KEY_RED_LED && user_key_code <= ALL_KEY_VALUE) { /*lsr modify 20220512 (KEY_BLUE_LED)*/
// keyboard_send_msg.cmd = user_key_code;
// }
// else {
// pr_err("Error key code %#x out of range!\n", keyboard_send_msg.cmd);
// return -1;
// }
// }
if(cmd == KEYBOARD_IOC_KEY_LED_ON) {
keyboard_send_msg.cmd_type = FRAME_CMD_TYPE_KEY_LED_ON;
set_bit(KEY_LED_ON_RESPONSE_BIT, &wait_respon_bits); //置高某一位
}
else {
keyboard_send_msg.cmd_type = FRAME_CMD_TYPE_KEY_LED_OFF;
set_bit(KEY_LED_OFF_RESPONSE_BIT, &wait_respon_bits); //置高某一位
}
break;
}
default:
pr_err("Error non-supported cmd %d\n", cmd);
return -7;
}
keyboard_send_msg.cmd_verify = FRAME_VERIFY(
keyboard_send_msg.cmd_header0,
keyboard_send_msg.cmd_header1,
keyboard_send_msg.cmd_type,
keyboard_send_msg.cmd,
0,
0);
#if 1
if(debug_print)
pr_err("i2c_master_send: h0 = %#x, h1 = %#x type = %#x, %#x, %#x\n",
keyboard_send_msg.cmd_header0,
keyboard_send_msg.cmd_header1,
keyboard_send_msg.cmd_type,
keyboard_send_msg.cmd,
keyboard_send_msg.cmd_verify);
#endif
mutex_lock(&iic_idel_Mutex); //不让发
mutex_lock(&iic_Mutex); //加锁
if(i2c_master_send(s_jc_keyboard_info.i2c_client, (char *)&keyboard_send_msg, sizeof(KEYBOARD_I2C_SEND_MSG_S)) != sizeof(KEYBOARD_I2C_SEND_MSG_S)) {
pr_err("Error i2c_master_send!\n");
mutex_unlock(&iic_Mutex); //开锁
mutex_unlock(&iic_idel_Mutex); //开锁
return -8;
}
mutex_unlock(&iic_Mutex);//开锁
if(down_timeout(&s_jc_keyboard_info.ioctl_sem, JC_KEYBOARD_I2C_TIMEOUT/4)) {
//没有中断的情况会超时
#ifndef NO_POLL_MODE
if(s_jc_keyboard_inttimeout_func_t())
#endif
{
pr_err("Error down_timeout!\n");
mutex_unlock(&iic_idel_Mutex); //开锁
return -9;
}
}
mutex_unlock(&iic_idel_Mutex); //开锁
switch(cmd) {
case KEYBOARD_IOC_GET_BRIGHTNESS:
if(test_bit(SET_BRIGHTNESS_RESPONSE_BIT, &wait_respon_bits))
{
pr_err("Error KEYBOARD_IOC_GET_BRIGHTNESS down_timeout! ----test_bit\n");
clear_bit(SET_BRIGHTNESS_RESPONSE_BIT, &wait_respon_bits);
return -20;
}
if(!argv || copy_to_user((void *)argv, &s_i2c_reply_ret, 1)) {
pr_err("Error copy_to_user!\n");
return -10;
}
break;
case KEYBOARD_IOC_GET_PANEL_MODEL:
if(test_bit(PANEL_MODEL_RESPONSE_BIT, &wait_respon_bits))
{
pr_err("Error KEYBOARD_IOC_GET_PANEL_MODEL down_timeout! ----test_bit\n");
clear_bit(PANEL_MODEL_RESPONSE_BIT, &wait_respon_bits);
return -21;
}
if(!argv || copy_to_user((void *)argv, &s_i2c_reply_ret, 1)) {
pr_err("Error copy_to_user!\n");
return -10;
}
break;
case KEYBOARD_IOC_GET_PANEL_VER:
if(test_bit(PANEL_VER_RESPONSE_BIT, &wait_respon_bits))
{
pr_err("Error KEYBOARD_IOC_GET_PANEL_VER down_timeout! ----test_bit\n");
clear_bit(PANEL_VER_RESPONSE_BIT, &wait_respon_bits);
return -22;
}
if(!argv || copy_to_user((void *)argv, &s_i2c_reply_ret, 1)) {
pr_err("Error copy_to_user!\n");
return -10;
}
break;
case KEYBOARD_IOC_SET_BRIGHTNESS:
if(test_bit(SET_BRIGHTNESS_RESPONSE_BIT, &wait_respon_bits))
{
pr_err("Error KEYBOARD_IOC_SET_BRIGHTNESS down_timeout! ----test_bit\n");
clear_bit(SET_BRIGHTNESS_RESPONSE_BIT, &wait_respon_bits);
return -23;
}
if(s_i2c_reply_ret == FRAME_CMD_REPLY_FAILED) {
pr_err("Error execute failed!\n");
return -11;
}
break;
case KEYBOARD_IOC_RESET:
if(test_bit(RESET_RESPONSE_BIT, &wait_respon_bits))
{
pr_err("Error KEYBOARD_IOC_RESET down_timeout! ----test_bit\n");
clear_bit(RESET_RESPONSE_BIT, &wait_respon_bits);
return -24;
}
if(s_i2c_reply_ret == FRAME_CMD_REPLY_FAILED) {
pr_err("Error execute failed!\n");
return -11;
}
break;
case KEYBOARD_IOC_KEY_LED_ON:
if(test_bit(KEY_LED_ON_RESPONSE_BIT, &wait_respon_bits))
{
pr_err("Error KEYBOARD_IOC_KEY_LED_ON down_timeout! ----test_bit\n");
clear_bit(KEY_LED_ON_RESPONSE_BIT, &wait_respon_bits);
return -25;
}
if(s_i2c_reply_ret == FRAME_CMD_REPLY_FAILED) {
pr_err("Error execute failed!\n");
return -11;
}
break;
case KEYBOARD_IOC_KEY_LED_OFF: //灯的控制部分，不再等待应答，2022-09-05
if(test_bit(KEY_LED_OFF_RESPONSE_BIT, &wait_respon_bits))
{
pr_err("Error KEYBOARD_IOC_KEY_LED_OFF down_timeout! ----test_bit\n");
clear_bit(KEY_LED_OFF_RESPONSE_BIT, &wait_respon_bits);
return -26;
}//return 0;
if(s_i2c_reply_ret == FRAME_CMD_REPLY_FAILED) {
pr_err("Error execute failed!\n");
return -11;
}
break;
default:
if((cmd & 0xfc) == KEYBOARD_IOC_KEY_LED_FLASH) //闪烁的指令
{
if(test_bit(KEY_LED_FLASH_RESPONSE_BIT, &wait_respon_bits))
{
pr_err("Error KEYBOARD_IOC_KEY_LED_FLASH down_timeout! ----test_bit\n");
clear_bit(KEY_LED_FLASH_RESPONSE_BIT, &wait_respon_bits);
return -27;
}
return 0;
}
break;
}
return 0;
}
static struct file_operations s_jc_keyboard_fops = {
.unlocked_ioctl = s_jc_keyboard_unlocked_ioctl,
};
static int s_jc_keyboard_misc_init(void) {
memset(&s_jc_keyboard_miscdevice, 0, sizeof(struct miscdevice));
s_jc_keyboard_miscdevice.minor = JC_KEYBOARD_MISCDEV_MINOR;
s_jc_keyboard_miscdevice.name = JC_KEYBOARD_DRIVER_NAME;
s_jc_keyboard_miscdevice.fops = &s_jc_keyboard_fops;
if(misc_register(&s_jc_keyboard_miscdevice)) {
pr_err("Error misc_register!\n");
return -1;
}
sema_init(&s_jc_keyboard_info.ioctl_sem, 0);
return 0;
}
static int s_jc_keyboard_misc_exit(void) {
misc_deregister(&s_jc_keyboard_miscdevice);
return 0;
}
static int jc_kayboard_command_for_read(struct i2c_client *client)
{
int ret = -1;
uint8_t tmpbuf[10] = {0};
struct i2c_msg msg[1];
msg[0].addr = client->addr;
msg[0].flags = I2C_M_RD;/*Read*/
msg[0].len = 7;
msg[0].buf = tmpbuf;
ret = i2c_transfer(client->adapter, msg, 1);
return ret;
}
//static void s_jc_keyboard_exit(void);
static int s_jc_keyboard_probe(struct i2c_client *i2c_client, const struct i2c_device_id *i2c_device_id) {
int ret;
// jc_keyboard_inited = -1;
if(debug_print)
pr_err("addr = %#x\n", i2c_client->addr);
ret = jc_kayboard_command_for_read(i2c_client); //尝试着读一次
if(ret < 0) //读不了直接返回
{
pr_err("error : jc_keyboard_command_for_read,no probe\n");
// s_jc_keyboard_exit();
return ret;
}
memset(&s_jc_keyboard_info, 0, sizeof(JC_KEYBOARD_INFO));
if((s_jc_keyboard_info.irq_gpio = of_get_named_gpio(i2c_client->dev.of_node, "irq-gpio", 0)) < 0) {
pr_err("Error of_get_named_gpio %s\n", "irq-gpio");
return -1;
}
if((i2c_client->irq = gpio_to_irq(s_jc_keyboard_info.irq_gpio)) < 0) {
pr_err("Error gpio_to_irq %d\n", s_jc_keyboard_info.irq_gpio);
return -1;
}
s_jc_keyboard_info.i2c_client = i2c_client;
if(s_jc_keyboard_input_init()) {
pr_err("Error s_jc_keyboard_input_init!\n");
return -1;
}
if(s_jc_keyboard_misc_init()) {
pr_err("Error s_jc_keyboard_misc_init!\n");
s_jc_keyboard_input_exit();
return -1;
}
if(s_jc_keyboard_irq_init()) {
pr_err("Error s_jc_keyboard_irq_init!\n");
s_jc_keyboard_misc_exit();
s_jc_keyboard_input_exit();
return -1;
}
mutex_init(&iic_Mutex); //初始化互斥锁
mutex_init(&iic_idel_Mutex);
// jc_keyboard_inited = 1; //加载成功！！
return 0;
}
static int s_jc_keyboard_remove(struct i2c_client *i2c_client) {
// if(jc_keyboard_inited != 1) //驱动没有加载成功！！
// return -1;
if(s_jc_keyboard_irq_exit()) {
pr_err("Error s_jc_keyboard_irq_exit!\n");
}
if(s_jc_keyboard_misc_exit()) {
pr_err("Error s_jc_keyboard_misc_exit!\n");
}
if(s_jc_keyboard_input_exit()) {
pr_err("Error s_jc_keyboard_input_exit!\n");
}
return 0;
}
static struct i2c_driver s_i2c_driver_jc_keyboard = {
.probe = s_jc_keyboard_probe,
.remove = s_jc_keyboard_remove,
.driver = {
.name = JC_KEYBOARD_DRIVER_NAME,
.owner = THIS_MODULE,
.of_match_table = s_jc_keyboard_match_table,
},
.id_table = s_jc_keyboard_i2c_id,
};
// static int s_jc_keyboard_init(void) {
// if(i2c_add_driver(&s_i2c_driver_jc_keyboard)) {
// pr_err("Error s_jc_keyboard_init i2c_add_driver!\n");
// return -1;
// }
// return 0;
// }
// static void s_jc_keyboard_exit(void) {
// return;
// // i2c_del_driver(&s_i2c_driver_jc_keyboard);
// }
module_i2c_driver(s_i2c_driver_jc_keyboard); //2023-03-30 增加
// module_init(s_jc_keyboard_init);
// module_exit(s_jc_keyboard_exit);
// date 需要修改内核的makefile ，注释 886 KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
MODULE_DESCRIPTION("Buildtime :"__DATE__" "__TIME__);
MODULE_AUTHOR("dazhi@jc,keyboard,2023-05");
MODULE_LICENSE("GPL");
MODULE_VERSION("1.1.0"); //2023-05-10 版本1.1.0
这里做了一个简单的分析，解决iic通信时的一个互斥问题，但是可能不是很完善，请各位多多包含指教。