first commit

.gitignore

@@ -0,0 +1,8 @@
+*~
+*.ko
+*.mod*
+*.o
+*.cmd
+Module.symvers
+modules.order
+.tmp_versions/

Makefile

@@ -0,0 +1,16 @@
+obj-m := rx2.o
+KDIR  := /lib/modules/$(shell uname -r)/build
+PWD   := $(shell pwd)
+DEPMOD:=$(shell which depmod)
+# possible bug: maybe this will work only on debian based systems
+SYSMAP:= /boot/System.map-$(shell uname -r)
+
+default:
+	$(MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules
+
+install:
+	$(MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules_install
+	$(DEPMOD) -ae -F $(SYSMAP)
+
+clean:
+	$(MAKE) -C $(KDIR) SUBDIRS=$(PWD) clean

rx2.c

@@ -0,0 +1,113 @@
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/gpio.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <asm/uaccess.h>
+#include <asm/delay.h>
+
+typedef struct { char *key; u8 value; } t_command;
+
+static t_command commands_table[] = {
+  { "ENDCODE",         4},
+  { "FORWARD",        10},
+  { "FORWARD_TURBO",  16},
+  { "TURBO",          22},
+  { "FORWARD_LEFT",   28},
+  { "FORWARD_RIGHT",  34},
+  { "BACKWARD",       40},
+  { "BACKWARD_RIGHT", 46},
+  { "BACKWARD_LEFT",  52},
+  { "LEFT",           58},
+  { "RIGHT",          64}
+};
+
+static ssize_t rx2_dev_write(struct file *filep, const char *buffer, size_t len, loff_t *offset);
+
+static const struct file_operations rx2_fops = {
+  .owner = THIS_MODULE,
+  .write = rx2_dev_write
+};
+
+static struct miscdevice rx2_dev = {
+  MISC_DYNAMIC_MINOR,
+  "rx2",
+  &rx2_fops
+};
+
+static int gpio = -1;
+
+static void rx2_send_command(u8 command) {
+  int w = 0;
+
+  for(w = 0; w < 4; w++) {
+    gpio_set_value(gpio, 1);
+    udelay(1200);
+    gpio_set_value(gpio, 0);
+    udelay(400);
+  }
+
+  for(w = 0; w < command; w++) {
+    gpio_set_value(gpio, 1);
+    udelay(400);
+    gpio_set_value(gpio, 0);
+    udelay(400);
+  }
+}
+
+static ssize_t rx2_dev_write(struct file *filep, const char *buffer, size_t len, loff_t *offset) {
+  u8 n;
+  for(n = 0; n < sizeof(commands_table) / sizeof(t_command); n++) {
+    if(strcmp(commands_table[n].key, buffer) == 0) {
+      printk(KERN_INFO "%s %i\n", commands_table[n].key, commands_table[n].value);
+      rx2_send_command(commands_table[n].value);
+      break;
+    }
+  }
+  return len;
+}
+
+static int __init rx2_init(void) {
+  int ret;
+  
+  if(!gpio_is_valid(gpio)) {
+    printk(KERN_ERR "rx2: invalid gpio\n");
+    return -EINVAL;
+  }
+  ret = gpio_request(gpio, "ant");
+  if(ret) {
+    if (ret == -EINVAL)
+      ret = -EPROBE_DEFER;
+    return ret;
+  }
+  printk(KERN_INFO "rx2: ant on gpio: %i\n",gpio);
+  gpio_direction_output(gpio, 0);
+
+  ret = misc_register(&rx2_dev);
+  
+  if(ret) {
+    printk(KERN_ERR "Unable to register rx2 device\n");
+    gpio_free(gpio);
+    return ret;
+  }          
+  return ret;
+}
+
+static void __exit rx2_exit(void) {
+  gpio_free(gpio);
+  misc_deregister(&rx2_dev);
+}
+
+module_init(rx2_init);
+module_exit(rx2_exit);
+
+module_param(gpio, int, 0444);
+MODULE_PARM_DESC(gpio, "Guess what");
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("encrypt <encrypt@labr.xyz>");
+MODULE_DESCRIPTION("Stupid driver for RX2 ic");
+MODULE_VERSION("0.1");