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注册时间： 2020-04-06

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全志f1c100s使用红外接收功能

使用的linux内核

git clone https://github.com/Lichee-Pi/linux.git --depth=1 -b nano-4.14-exp

1、修改 include/dt-bindings/clock/suniv-ccu.h 文件
在

#define CLK_AVS 66

下面添加

#define CLK_CIR 67

2、修改 drivers/clk/sunxi-ng/ccu-suniv.h 文件
把

#define CLK_NUMBER	(CLK_AVS + 1)

改成

#define CLK_NUMBER	(CLK_CIR + 1)

3、修改 drivers/clk/sunxi-ng/ccu-suniv.c 文件
添加如下定义

static const char * const cir_parents[] = { "losc", "osc24M" };
static SUNXI_CCU_MP_WITH_MUX_GATE(cir_clk, "ir", cir_parents, 0x0b8,
				0, 4,	/* M */
				16, 2,	/* P */
				24, 2,	/* mux */
				BIT(31),	/* gate */
				0);

在 suniv_ccu_clks[] 追加一项 &cir_clk.common,

static struct ccu_common *suniv_ccu_clks[] = {
	......
	&avs_clk.common,
	&cir_clk.common,		// 添加这一行
};

在 suniv_hw_clks 追加一项 &cir_clk.common,

static struct clk_hw_onecell_data suniv_hw_clks = {
	.hws	= {
		......
		[CLK_AVS] = &avs_clk.common.hw,
		[CLK_CIR] = &cir_clk.common.hw,	// 添加这一行
	},
	.num	= CLK_NUMBER,
};

4、修改 suniv.dtsi 文件
添加

cir_pins_a: cir@0 {
	pins = "PE11";
	function = "ir";
	allwinner,muxsel = <4>;
	allwinner,drive = <1>;
	allwinner,pull = <0>;
};
 
cir: cir@1C22C00{ 
	compatible = "allwinner,sun4i-a10-ir";
	reg = <0x01C22C00 0x400>;
	interrupts = <6>;
	clocks = <&ccu CLK_BUS_IR>, <&ccu CLK_CIR>;
	clock-names = "apb", "ir";
	resets = <&ccu RST_BUS_IR>;
	pinctrl-names = "default";
	pinctrl-0 = <&cir_pins_a>;
	status = "okay";
};

5、make ARCH=arm menuconfig打开linux内核配置如下选项：

Device Drivers  --->
	<*> Remote Controller support  --->
		[*]   Remote controller decoders  --->
			<*>   Enable IR raw decoder for the NEC protocol
			<*>   Enable IR raw decoder for the RC-5 protocol
			<*>   Enable IR raw decoder for the RC6 protocol
			<*>   Enable IR raw decoder for the JVC protocol
			<*>   Enable IR raw decoder for the Sony protocol
			<*>   Enable IR raw decoder for the Sanyo protocol
			<*>   Enable IR raw decoder for the Sharp protocol
			<*>   Enable IR raw decoder for the MCE keyboard/mouse protocol
			<*>   Enable IR raw decoder for the XMP protocol
		[*]   Remote Controller devices  --->
			<*>   SUNXI IR remote control

6、重新编译内核，系统启动时若IR初始化正常，将打印如下IR相关的日志信息

[    0.955993] IR NEC protocol handler initialized
[    0.960649] IR RC5(x/sz) protocol handler initialized
[    0.965699] IR RC6 protocol handler initialized
[    0.970268] IR JVC protocol handler initialized
[    0.974788] IR Sony protocol handler initialized
[    0.979426] IR SANYO protocol handler initialized
[    0.984121] IR Sharp protocol handler initialized
[    0.988844] IR MCE Keyboard/mouse protocol handler initialized
[    0.994660] IR XMP protocol handler initialized
[    1.000837] Registered IR keymap rc-empty
[    1.005153] rc rc0: sunxi-ir as /devices/platform/soc/1c22c00.cir/rc/rc0
[    1.012409] input: sunxi-ir as /devices/platform/soc/1c22c00.cir/rc/rc0/input2
[    1.021028] input: MCE IR Keyboard/Mouse (sunxi-ir) as /devices/virtual/input/input3
[    1.029990] sunxi-ir 1c22c00.cir: initialized sunXi IR driver

7、查看红外接收支持的解码协议

# cat /sys/class/rc/rc0/protocols
rc-5 nec rc-6 jvc sony rc-5-sz sanyo sharp mce_kbd xmp

8、使用 NEC 协议

# echo nec > /sys/class/rc/rc0/protocols

# cat /sys/class/rc/rc0/protocols
rc-5 [nec] rc-6 jvc sony rc-5-sz sanyo sharp mce_kbd xmp

9、查看输入设备

# cat /proc/bus/input/devices
I: Bus=0019 Vendor=0001 Product=0001 Version=0100
N: Name="1c24800.rtp"
P: Phys=sun4i_ts/input0
S: Sysfs=/devices/platform/soc/1c24800.rtp/input/input0
U: Uniq=
H: Handlers=event0 
B: PROP=0
B: EV=b
B: KEY=400 0 0 0 0 0 0 0 0 0 0
B: ABS=3
 
I: Bus=0019 Vendor=0000 Product=0000 Version=0000
N: Name="rotary@0"
P: Phys=
S: Sysfs=/devices/platform/rotary@0/input/input1
U: Uniq=
H: Handlers=event1 
B: PROP=0
B: EV=5
B: REL=1
 
I: Bus=0019 Vendor=0001 Product=0001 Version=0100
N: Name="sunxi-ir"
P: Phys=sunxi-ir/input0
S: Sysfs=/devices/platform/soc/1c22c00.cir/rc/rc0/input2
U: Uniq=
H: Handlers=kbd event2 
B: PROP=0
B: EV=100013
B: KEY=1000000 0 0 0 0
B: MSC=10
 
I: Bus=0000 Vendor=0000 Product=0000 Version=0000
N: Name="MCE IR Keyboard/Mouse (sunxi-ir)"
P: Phys=/input0
S: Sysfs=/devices/virtual/input/input3
U: Uniq=
H: Handlers=kbd event3 
B: PROP=0
B: EV=100017
B: KEY=30000 0 7 ff87207a c14057ff febeffdf ffefffff ffffffff fffffffe
B: REL=3
B: MSC=10

10、测试红外接收
从上面输入设备可以看到，ir使用event2，通过使用evtest测试，按下遥控器时，evtest输出如下按键信息，输出的value值与逻辑分析仪采集的数据一致，说明按键码接收正常。

# evtest /dev/input/event2 
Input driver version is 1.0.1
Input device ID: bus 0x19 vendor 0x1 product 0x1 version 0x100
Input device name: "sunxi-ir"
Supported events:
  Event type 0 (EV_SYN)
  Event type 1 (EV_KEY)
    Event code 152 (KEY_SCREENLOCK)
  Event type 4 (EV_MSC)
    Event code 4 (MSC_SCAN)
Key repeat handling:
  Repeat type 20 (EV_REP)
    Repeat code 0 (REP_DELAY)
      Value    500
    Repeat code 1 (REP_PERIOD)
      Value    125
Testing ... (interrupt to exit)
Event: time 68.119608, type 4 (EV_MSC), code 4 (MSC_SCAN), value 114
Event: time 68.119608, -------------- SYN_REPORT ------------
Event: time 68.171084, type 4 (EV_MSC), code 4 (MSC_SCAN), value 114
Event: time 68.171084, -------------- SYN_REPORT ------------