LINUX 3.X 1-WIRE

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本文介绍如何为DS28E01一维总线设备配置Linux内核驱动，包括修改设备树、内核配置及加载模块等步骤，并验证驱动是否正确安装。

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PLATFORM:LINUX 3.14 AM437X
Deivce: ds28e01

1.设备树

STEP1：

   onewire {
           compatible      = "w1-gpio";
           pinctrl-names   = "default";
           pinctrl-0       = <&dallas_w1_pins>;
           status          = "okay";
           /* 1-wire test pin GPIO4_0*/
           gpios           = <&gpio4 0 0>;
           #if 0
               /* enno 1-wire ds28e01 USB1_DRVVBUS.GPIO3_13*/
               gpios           = <&gpio3 13 0>;
           #endif
   };

   STEP2：
   /* 1-wire test pin */
   dallas_w1_pins: pinmux_dallas_w1_pins {
       pinctrl-single,pins = <0x1B0 (PIN_INPUT | INPUT_EN | MUX_MODE7) >;/* AE17= GPIO4_0 = cam0_hd.GPIO4_0,MODE7 TLD437X TEST */
   };
#if 0
   /* 1-wire ds28e01 USB1_DRVVBUS.GPIO3_13 */
   dallas_w1_pins: pinmux_dallas_w1_pins {
       pinctrl-single,pins = <0x2C4 (PIN_INPUT | INPUT_EN | MUX_MODE7) >;/* F25 = GPIO3_13/gpio0_25 = USB1_DRVVBUS.GPIO3_13, MODE7 not use*/
   };
#endif

2.修改步骤
1.make menuconfig
     -> Device Drivers
         -> Dallas's 1-wire support
           -> 1-wire Bus Masters

   < > Matrox G400 transport layer for 1-wire
     < > DS2490 USB <-> W1 transport layer for 1-wire
     < > Maxim DS2482 I2C to 1-Wire bridge
     < > Maxim DS1WM 1-wire busmaster
     <M> GPIO 1-wire busmaster
     < > OMAP HDQ driver

   即.config
   CONFIG_W1_MASTER_GPIO=M
2.修改kernel
   路径：xxxx/kernel/drivers/w1/w1_family.h
   第40行添加：#define W1_FAMILY_DS28E01   0x2F

   $insmod w1-gpio.ko
   $insmod w1_ds28e04.ko

3.确认挂载成功
   $cd /sys/bus/w1/devices
   $ls

note1:
   如果有设备,则挂载成功，/sys/bus/w1/devices文件下除了w1_bus_master1文件，还有其他的
   例如:2f-00000123e80e
   2f---------------->family   (2 Bytes)
   00000123e80e ----->id       (12 Bytes)
   如果没有相应family的驱动，则添加默认驱动
       *debug内核调试信息：w1_master_driver w1_bus_master1: Family 2f for 2f.00000123e80e.09 is not registered
       *解决方法：添加ds28e01 family的驱动，添加0x2f
   09---------------->crc      (2 Bytes)
   2f.00000123e80e.09->1-wire 64 Bits地址


参考：

http://linux-sunxi.org/1-Wire
sha1加密驱动：
http://blog.youkuaiyun.com/wangjasonlinux/article/details/8993408