mirror of
https://github.com/polhenarejos/pico-rng.git
synced 2026-04-27 17:23:22 +02:00
111 lines
2.9 KiB
C
111 lines
2.9 KiB
C
#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/usb.h>
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#include <linux/ioctl.h>
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#include <linux/slab.h>
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#include <linux/fs.h>
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#include <linux/kernel.h>
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#include <linux/semaphore.h>
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#include <asm/uaccess.h>
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Mickey Malone");
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MODULE_DESCRIPTION("Random number generator using a Raspberry Pi Pico");
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MODULE_VERSION("1.0");
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/**
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* Static constants
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**/
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#define VENDOR_ID 0x0
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#define PRODUCT_ID 0x4
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#define SC_MINOR_BASE 31
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/**
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* Helper macros
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**/
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#define LOGGER_INFO(fmt, args ...) printk( KERN_INFO "[info] %s(%d): " fmt, __FUNCTION__, __LINE__, ## args)
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#define LOGGER_ERR(fmt, args ...) printk( KERN_ERR "[err] %s(%d): " fmt, __FUNCTION__, __LINE__, ## args)
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#define LOGGER_WARN(fmt, args ...) printk( KERN_ERR "[warn] %s(%d): " fmt, __FUNCTION__, __LINE__, ## args)
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#define LOGGER_DEBUG(fmt, args ...) if (debug == 1) { printk( KERN_DEBUG "[debug] %s(%d): " fmt, __FUNCTION__, __LINE__, ## args); }
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/**
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* Prototype Functions
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**/
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static int pico_rng_usb_probe(struct usb_interface *interface, const struct usb_device_id *id);
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static void pico_rng_usb_disconnect(struct usb_interface *interface);
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static int __init pico_rng_driver_init(void);
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static void __exit pico_rng_driver_exit(void);
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/**
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* Data structure of the USB vid:pid device that we will support
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**/
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static struct usb_device_id pico_rng_usb_table [] = {
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{ USB_DEVICE(VENDOR_ID, PRODUCT_ID) },
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{ }
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};
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/**
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* USB driver data structure
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**/
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static struct usb_driver pico_rng_usb_driver = {
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.name = "pico_rng",
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.id_table = pico_rng_usb_table,
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.probe = pico_rng_usb_probe,
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.disconnect = pico_rng_usb_disconnect,
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};
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/**
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* USB: Probe
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* This method will be called if the device we plug in matches the vid:pid we are listening for
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**/
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static int pico_rng_usb_probe(struct usb_interface *interface, const struct usb_device_id *id)
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{
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LOGGER_INFO("pico rng usb device initialized\n");
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// TODO: Setup USB device, create seed thread to continuously gather entropy from device.
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return 0;
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}
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/**
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* USB:disconnect
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* This method is used to cleanup everything after the device is disconnected
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**/
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static void pico_rng_usb_disconnect(struct usb_interface *interface)
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{
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LOGGER_INFO("pico rng usb device disconnected\n");
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}
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static int __init pico_rng_driver_init(void)
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{
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int result;
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LOGGER_INFO("pico rng driver debut\n");
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result = usb_register(&pico_rng_usb_driver);
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if(result)
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{
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LOGGER_ERR("registering pico rng driver failed\n");
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}
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else
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{
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LOGGER_INFO("pico rng driver registered successfully\n");
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}
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return result;
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}
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static void __exit pico_rng_driver_exit(void)
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{
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usb_deregister(&pico_rng_usb_driver);
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return;
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}
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module_init(pico_rng_driver_init);
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module_exit(pico_rng_driver_exit);
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