ltp-guf-test (aio): added support for absolute device-names (refs #39960)

* @aio@ tool can now use device-names of the form
** e.g. @iio:device0/in_voltage_raw@ to specify devices relative to @/sys/bus/iio/devices/@, as before
** or e.g. @/dev/ain1/in_voltage_raw@ to specify absolute device names

Change-Id: Id0e38ea614e03b3f3363209a5ce3af21c5a7fb0a

runtest/sanvito-custom

@@ -14,6 +14,10 @@
 #-----------------------------------------------------------------------------#
 
 # Vorm Start einmal:
+# source /opt/ltp/setup.sh
+#
+# setup.sh:
+###########
 # export PATH=$PATH:/opt/ltp/testcases/bin
 # export DISPLAY=:0
 
@@ -25,7 +29,7 @@ Testimage_display           bball -f -l 0.1 &
 
 Touchtest_remove_socket     rm -f /opt/touch_tst_socket
 Touchtest_start             touchmon -d -i /dev/input/event0 -s /opt/touch_tst_socket -p 0
-Network_start				iptables -P INPUT ACCEPT; iptables -P OUTPUT ACCEPT;
+Network_start				iptables -P INPUT ACCEPT; iptables -P OUTPUT ACCEPT; iptables -P FORWARD ACCEPT;
 #Network_eth0                ifconfig lan1 add 192.168.1.1
 #Network_eth1                ifconfig lan2 add 192.168.2.1
 #Network_eth2                ifconfig lan3 add 192.168.3.1
@@ -37,7 +41,7 @@ Buzzer_start				echo 0 >/sys/class/pwm/pwmchip3/export; echo 333333 >/sys/class/
 #LED_Power_start				echo 0 >/sys/class/pwm/pwmchip2/export; echo 2000000 >/sys/class/pwm/pwmchip2/pwm0/period; echo 1000000 >/sys/class/pwm/pwmchip2/pwm0/duty_cycle; echo 1 >/sys/class/pwm/pwmchip2/pwm0/enable
 #LED_Error_start				echo 0 >/sys/class/pwm/pwmchip1/export; echo 2000000 >/sys/class/pwm/pwmchip1/pwm0/period; echo 1000000 >/sys/class/pwm/pwmchip1/pwm0/duty_cycle; echo 1 >/sys/class/pwm/pwmchip1/pwm0/enable
 Ambient_Proximity			ambprox_setup.sh 
-USB_stick_start				ubus call board enable '{"name": "usb"}'
+USB_stick_start				ubus call board enable '{"name": "usb"}'; mount -o remount,rw /tmp/E26F-BE71; 
 
 #-----------------------------------------------------------------------------#
 # TESTCASES                                                                   #
@@ -46,17 +50,17 @@ GPIO1                       gpio_inout -o /sys/devices/soc0/gpio_export_keypad_f
 GPIO2                       gpio_inout -o /sys/devices/soc0/gpio_export_keypad_fixed_out/DIG_OUT_2 -g /sys/devices/soc0/gpio_export_keypad_fixed_in/DIG_IN2 -d 1
 Temp                        lm73temp -n lm75
 #MMC_write_25kB              if [ -b /dev/mmcblk1 ]; then df /media/mmcblk1/ | grep mmcblk1 || mount /dev/mmcblk1 /media/mmcblk1;  fwrite -q -n /media/mmcblk1/testfile -b 25000 -d -i 1; else false; fi
-#USB_stick_1_write_25kB      if [ -b /dev/sda ]; then df /tmp/E26F-BE71/ | grep sda || mount /dev/sda /tmp/E26F-BE71/;  fwrite -q -n /tmp/E26F-BE71/testfile -b 60000 -d -i 1; else false; fi
+USB_stick_1_write_25kB      if [ -b /dev/sda ]; then df /tmp/E26F-BE71/ | grep sda || mount -o rw /dev/sda /tmp/E26F-BE71/;  fwrite -q -n /tmp/E26F-BE71/testfile -b 60000 -d -i 1; else false; fi
 #Network_eth0                iptest -q -g 192.168.1.100 -n 2000 -w 50
 #Network_eth1                iptest -q -g 192.168.2.100 -n 2000 -w 50
 #Network_eth2                iptest -q -g 192.168.3.100 -n 2000 -w 50
 RS485_BB2                   rs485pingpong -b 32 -r 6 -s 4800 -x 100 -o 1 -d /dev/xye2 -n  
 RS485_34                    rs485pingpong -b 32 -r 6 -s 4800 -x 100 -o 1 -d /dev/xye4 -n
-#RS485_5                     rs485pingpong -b 32 -r 6 -s 57600 -x 100 -o 1 -d /dev/rs485 
+RS485_5                     rs485pingpong -b 32 -r 6 -s 57600 -x 100 -o 1 -d /dev/rs485 -n
 Touch                       touchmon -z -r /opt/touch_tst_socket
 Ambient						i2c -d /dev/i2c-2 -s 0x60 -a 0x0b -n 0 -x 65536 -m 8 -l 2 -i 10
 Proximity					i2c -d /dev/i2c-2 -s 0x60 -a 0x08 -n 0 -x 65536 -m 8 -l 2 -i 10
-AnalogIO					aio -s iio:device0/in_voltage_raw -o iio:device2/out_voltage0_raw -g 0.078125 -e 0.4 -v -m 5 -i 5; 
+AnalogIO					aio -s /dev/ain1/in_voltage_raw -o /dev/aout1/out_voltage0_raw -e 0.4 -v -m 5 -i 5; 
 Buzzer						echo 1 >/sys/class/pwm/pwmchip3/pwm0/enable; usleep 100000; echo 0 >/sys/class/pwm/pwmchip3/pwm0/enable
 Wait                        sleep 0.9
 

testcases/aio/aio.c

@@ -133,11 +133,23 @@ double getscale(char *device_name, char *scale_name)
 		goto error;
 
 	char *iio_dev = dirname(temp);
-	name = calloc(sizeof(char), strlen(conf_iio_path)+strlen(iio_dev)+strlen(scale_name)+2);
-	if (!name)
-		goto error;
 
-	sprintf(name, "%s%s/%s", conf_iio_path, iio_dev, scale_name);
+	if (device_name[0] != '/') {
+		// assume relative paths are relative to conf_iio_path
+		name = calloc(sizeof(char), strlen(conf_iio_path)+strlen(iio_dev)+strlen(scale_name)+2);
+		if (!name)
+			goto error;
+
+		sprintf(name, "%s%s/%s", conf_iio_path, iio_dev, scale_name);
+	} else {
+		// assume absolute paths are directly usable devices
+		name = calloc(sizeof(char), strlen(iio_dev)+strlen(scale_name)+2);
+		if (!name)
+			goto error;
+
+		sprintf(name, "%s/%s", iio_dev, scale_name);
+	}
+
 	fd = fopen(name, "r");
 	if (!fd)
 		goto error;
@@ -185,14 +197,26 @@ FILE *opendevice(char *device_name, const char *mode)
 		return fd;
 	}
 
-	name = calloc(sizeof(char), strlen(conf_iio_path)+strlen(device_name)+1);
-	if (!name) {
-		tst_brkm(TBROK, cleanup,
-			"Unable to open the IIO device %s. Error: %d, %s",
-			device_name, errno, strerror(errno));
-		return fd;
+	if (device_name[0] != '/') {
+		// assume relative paths are relative to conf_iio_path
+		name = calloc(sizeof(char), strlen(conf_iio_path)+strlen(device_name)+1);
+		if (!name) {
+			tst_brkm(TBROK, cleanup,
+				"Unable to open the IIO device %s. Error: %d, %s",
+				device_name, errno, strerror(errno));
+			return fd;
+		}
+		sprintf(name, "%s%s", conf_iio_path, device_name);
+	} else {
+		// assume absolute paths are directly usable devices
+		name = strdup(device_name);
+		if (!name) {
+			tst_brkm(TBROK, cleanup,
+				"Unable to open the IIO device %s. Error: %d, %s",
+				device_name, errno, strerror(errno));
+			return fd;
+		}
 	}
-	sprintf(name, "%s%s", conf_iio_path, device_name);
 	fd = fopen(name, mode);
 	if (!fd) {
 		tst_brkm(TBROK, cleanup,