ODROID-C5: debian: change build rule

Change-Id: I44b0fcb6a753cab1f8bafbadb21d0f2a5602a30b

debian/rules

@@ -2,8 +2,10 @@
 
 define firmware
 	make distclean
-	echo CONFIG_MACH_LINUX=y | tr -d '[[:space:]]' \
-		> $(shell pwd)/.config && make olddefconfig
+	echo CONFIG_MACH_LINUX=y \
+		> $(shell pwd)/.config
+	 echo CONFIG_MACH_LINUX_ODROIDC5=y | tr -d '[[:space:]]' \
+		>> $(shell pwd)/.config && make olddefconfig
 	TOPDIR=$(shell pwd) make
 	mkdir -p $(shell pwd)/firmware/LINUX
 	cp out/klipper.elf $(shell pwd)/firmware/LINUX/klipper_mcu

src/linux/Kconfig

@@ -16,6 +16,22 @@ config BOARD_DIRECTORY
     string
     default "linux"
 
+######################################################################
+# Board selection
+######################################################################
+
+choice
+    prompt "Board model"
+    config MACH_LINUX_DEFAULT
+        bool "DEFAULT"
+	config MACH_LINUX_ODROIDC5
+		bool "ODROID-C5"
+		select MACH_LINUX_ODROID_COMMON
+endchoice
+
+config MACH_LINUX_ODROID_COMMON
+    bool
+
 config CLOCK_FREQ
     int
     default 50000000

src/linux/Makefile

@@ -3,10 +3,13 @@
 dirs-y += src/linux src/generic
 
 src-y += linux/main.c linux/timer.c linux/console.c linux/watchdog.c
-src-y += linux/pca9685.c linux/spidev.c linux/analog.c linux/hard_pwm.c
+src-y += linux/pca9685.c linux/spidev.c linux/hard_pwm.c
 src-y += linux/i2c.c linux/gpio.c generic/crc16_ccitt.c generic/alloc.c
 src-y += linux/sensor_ds18b20.c
 
+src-$(CONFIG_MACH_LINUX_DEFAULT) += linux/analog.c
+src-$(CONFIG_MACH_LINUX_ODROIDC5) += linux/analog_odroidc5.c
+
 CFLAGS_klipper.elf += -lutil -lrt -lpthread
 
 flash: $(OUT)klipper.elf

src/linux/analog.c

@@ -13,55 +13,29 @@
 #include "internal.h" // report_errno
 #include "sched.h" // sched_shutdown
 
-// ODROID-C5
-DECL_CONSTANT("ADC_MAX", 1800);
+DECL_CONSTANT("ADC_MAX", 4095); // Assume 12bit adc
 
 #define ANALOG_START (1<<12)
 
 DECL_ENUMERATION_RANGE("pin", "analog0", ANALOG_START, 8);
 
-// ODROID-C5
-#define IIO_PATH "/sys/bus/iio/devices/iio:device0/in_voltage0_raw"
-#define SCALE_PATH "/sys/bus/iio/devices/iio:device0/in_voltage_scale"
-#define OFFSET_PATH "/sys/bus/iio/devices/iio:device0/in_voltage_offset"
+#define IIO_PATH "/sys/bus/iio/devices/iio:device0/in_voltage%d_raw"
 
 struct gpio_adc
 gpio_adc_setup(uint32_t pin)
 {
-    struct gpio_adc g;
-	int fd;
-    char buf[64];
-    int ret;
+    char fname[256];
+    snprintf(fname, sizeof(fname), IIO_PATH, pin-ANALOG_START);
 
-	fd = open(SCALE_PATH, O_RDONLY);
-    ret = read(fd, buf, sizeof(buf)-1);
-    if (ret <= 0) {
-        goto fail;
-    }
-    buf[ret] = '\0';
-    g.scale = atof(buf) * 1000;
-    close(fd);
-
-    fd = open(OFFSET_PATH, O_RDONLY);
-    ret = read(fd, buf, sizeof(buf)-1);
-    if (ret <= 0) {
-        goto fail;
-    }
-    buf[ret] = '\0';
-    g.offset = atoi(buf);
-    close(fd);
-
-    fd = open(IIO_PATH, O_RDONLY|O_CLOEXEC);
+    int fd = open(fname, O_RDONLY|O_CLOEXEC);
     if (fd < 0) {
         report_errno("analog open", fd);
         goto fail;
     }
-    ret = set_non_blocking(fd);
+    int ret = set_non_blocking(fd);
     if (ret < 0)
         goto fail;
-
-    g.fd = fd;
-    return g;
+    return (struct gpio_adc){ .fd = fd };
 fail:
     if (fd >= 0)
         close(fd);
@@ -78,7 +52,6 @@ uint16_t
 gpio_adc_read(struct gpio_adc g)
 {
     char buf[64];
-    int voltage;
     int ret = pread(g.fd, buf, sizeof(buf)-1, 0);
     if (ret <= 0) {
         report_errno("analog read", ret);
@@ -86,14 +59,7 @@ gpio_adc_read(struct gpio_adc g)
         return 0;
     }
     buf[ret] = '\0';
-
-	voltage = atoi(buf) + g.offset;
-	voltage = voltage > 0 ? voltage : 0;
-	voltage = voltage * g.scale;
-	voltage = voltage < 1800000 ? voltage : 1800000;
-	voltage /= 1000;
-
-    return voltage;
+    return atoi(buf);
 }
 
 void

src/linux/analog_odroidc5.c

@@ -0,0 +1,102 @@
+// Read analog values from Linux IIO device
+//
+// Copyright (C) 2017  Kevin O'Connor <kevin@koconnor.net>
+//
+// This file may be distributed under the terms of the GNU GPLv3 license.
+
+#include <fcntl.h> // open
+#include <stdio.h> // snprintf
+#include <stdlib.h> // atoi
+#include <unistd.h> // read
+#include "command.h" // shutdown
+#include "gpio.h" // gpio_adc_setup
+#include "internal.h" // report_errno
+#include "sched.h" // sched_shutdown
+
+// ODROID-C5
+DECL_CONSTANT("ADC_MAX", 1800);
+
+#define ANALOG_START (1<<12)
+
+DECL_ENUMERATION_RANGE("pin", "analog0", ANALOG_START, 8);
+
+// ODROID-C5
+#define IIO_PATH "/sys/bus/iio/devices/iio:device0/in_voltage0_raw"
+#define SCALE_PATH "/sys/bus/iio/devices/iio:device0/in_voltage_scale"
+#define OFFSET_PATH "/sys/bus/iio/devices/iio:device0/in_voltage_offset"
+
+struct gpio_adc
+gpio_adc_setup(uint32_t pin)
+{
+    struct gpio_adc g;
+	int fd;
+    char buf[64];
+    int ret;
+
+	fd = open(SCALE_PATH, O_RDONLY);
+    ret = read(fd, buf, sizeof(buf)-1);
+    if (ret <= 0) {
+        goto fail;
+    }
+    buf[ret] = '\0';
+    g.scale = atof(buf) * 1000;
+    close(fd);
+
+    fd = open(OFFSET_PATH, O_RDONLY);
+    ret = read(fd, buf, sizeof(buf)-1);
+    if (ret <= 0) {
+        goto fail;
+    }
+    buf[ret] = '\0';
+    g.offset = atoi(buf);
+    close(fd);
+
+    fd = open(IIO_PATH, O_RDONLY|O_CLOEXEC);
+    if (fd < 0) {
+        report_errno("analog open", fd);
+        goto fail;
+    }
+    ret = set_non_blocking(fd);
+    if (ret < 0)
+        goto fail;
+
+    g.fd = fd;
+    return g;
+fail:
+    if (fd >= 0)
+        close(fd);
+    shutdown("Unable to open adc device");
+}
+
+uint32_t
+gpio_adc_sample(struct gpio_adc g)
+{
+    return 0;
+}
+
+uint16_t
+gpio_adc_read(struct gpio_adc g)
+{
+    char buf[64];
+    int voltage;
+    int ret = pread(g.fd, buf, sizeof(buf)-1, 0);
+    if (ret <= 0) {
+        report_errno("analog read", ret);
+        try_shutdown("Error on analog read");
+        return 0;
+    }
+    buf[ret] = '\0';
+
+	voltage = atoi(buf) + g.offset;
+	voltage = voltage > 0 ? voltage : 0;
+	voltage = voltage * g.scale;
+	voltage = voltage < 1800000 ? voltage : 1800000;
+	voltage /= 1000;
+
+    return voltage;
+}
+
+void
+gpio_adc_cancel_sample(struct gpio_adc g)
+{
+}

src/linux/gpio.h

@@ -1,6 +1,7 @@
 #ifndef __LINUX_GPIO_H
 #define __LINUX_GPIO_H
 
+#include "autoconf.h" // CONFIG_MACH_LINUX_*
 #include <stdint.h> // uint8_t
 
 struct gpio_out {
@@ -20,8 +21,10 @@ void gpio_in_reset(struct gpio_in g, int8_t pull_up);
 uint8_t gpio_in_read(struct gpio_in g);
 
 struct gpio_adc {
+#ifdef CONFIG_MACH_LINUX_ODROIDC5
     int scale;
     int offset;
+#endif
     int fd;
 };
 struct gpio_adc gpio_adc_setup(uint32_t pin);