driver: added basic razer driver (viper mini)

drivers/razer/Makefile

@@ -0,0 +1,13 @@
+CC=gcc
+CFLAGS=$(shell pkg-config --cflags libusb-1.0) -O3 -Wall -shared
+LDFLAGS=$(shell pkg-config --libs libusb-1.0)
+
+FINAL_ASSETS=$(BUILD_DIR)/drivers/assets/razer-viper_mini.png
+BUILD_DIR=../../build/
+
+all: $(BUILD_DIR)/drivers/razer.so $(FINAL_ASSETS)
+
+$(BUILD_DIR)/drivers/razer.so: razer.c | $(BUILD_DIR)/drivers/
+	$(CC) $(CFLAGS) -o $@ $^
+$(BUILD_DIR)/drivers/assets/%.png: %.png | $(BUILD_DIR)/drivers/assets
+	cp $^ $@

drivers/razer/razer.c

@@ -0,0 +1,106 @@
+#include "razer.h"
+
+static uint8_t compute_crc(void* report)
+{
+    uint8_t* r = report;
+
+    uint8_t crc = 0;
+    for(size_t i = 2; i < REPORT_SIZE - sizeof(report_footer_t); i++)
+    {
+        crc ^= r[i];
+    }
+
+    return crc;
+}
+
+static int send_command(libusb_device_handle* hand, uint8_t command_class, uint8_t command, uint8_t size, void* report)
+{
+    report_header_t* head = report;
+    head->report_size = size;
+    head->command_class = command_class;
+    head->command_id = command;
+
+    report_footer_t* footer = report + REPORT_SIZE - sizeof(report_footer_t);
+    footer->crc = compute_crc(report);
+
+    // Send command
+    int res = libusb_control_transfer(hand,
+    0x21, // request type
+    0x09, // request (SET_REPORT)
+    0x300, // wValue (FEATURE << 8 | REPORT(0))
+    0x0, // wIndex = 0x0 : interface
+    report,
+    REPORT_SIZE, // wLength = 90
+    0 /* timeout*/);
+
+    if(res <= 0) return res;
+
+    // Wait for the mouse to catch the report
+    usleep(100);
+
+    // Get response report
+    res = libusb_control_transfer(hand,
+    0xa1, // request type
+    0x01, // request (GET_REPORT)
+    0x300, // wValue (FEATURE << 8 | REPORT(0))
+    0x0, // wIndex = 0x0 : interface
+    report,
+    REPORT_SIZE, // wLength = 90
+    0);
+
+    return res;
+}
+
+void driver_init(void) {}
+
+uint32_t driver_getkey(void)
+{
+    static int count = 0;
+    count++;
+
+    // Register ALL razer compatible devices
+    uint16_t id = 0;
+    switch(count)
+    {
+        case 1:
+            id = VIPER_MINI_PRODUCT_ID;
+            break;
+        default:
+            id = 0;
+    }
+    
+    if(id == 0) return 0;
+    return (VENDOR_ID << 16) | id;
+}
+
+char* driver_get_name(void* handle)
+{
+    libusb_device* dev = handle;
+
+    struct libusb_device_descriptor desc;
+    libusb_get_device_descriptor(dev, &desc);
+
+    switch(desc.idProduct)
+    {
+        case VIPER_MINI_PRODUCT_ID:
+            return VIPER_MINI_NAME;
+        default:
+            return "Unknown Razer mice";
+    }
+}
+
+char* driver_get_image(void* handle)
+{
+    libusb_device* dev = handle;
+
+    struct libusb_device_descriptor desc;
+    libusb_get_device_descriptor(dev, &desc);
+
+    switch(desc.idProduct)
+    {
+        case VIPER_MINI_PRODUCT_ID:
+            return VIPER_MINI_IMAGE;
+        default:
+            return "";
+    }
+}

drivers/razer/razer.h

@@ -0,0 +1,148 @@
+#ifndef RAZER_H
+#define RAZER_H
+
+#include <libusb.h>
+#include <stdlib.h>
+#include <assert.h>
+
+#define VENDOR_ID 0x1532
+
+#define REPORT_SIZE 90
+
+/* Devices */
+#include "viper_mini.h"
+
+typedef struct REPORT_HEADER
+{
+    uint8_t status;
+    uint8_t transaction_id;
+    
+    uint8_t remaining_packets_high;
+    uint8_t remaining_packets_low;
+    uint8_t protocol_type; // 0x0
+    uint8_t report_size;
+
+    uint8_t command_class;
+    uint8_t command_id;
+} __attribute__((packed)) report_header_t;
+
+typedef struct REPORT_FOOTER
+{
+    uint8_t crc; // Control, xored bytes of report
+    uint8_t reserved;
+} __attribute__((packed)) report_footer_t;
+
+/* Commands of the BASIC (0x0) class */
+#define COMMAND_CLASS_BASIC 0x0
+
+struct REPORT_FIRMWARE_VERSION
+{
+    report_header_t header;
+
+    uint8_t version_major;
+    uint8_t version_minor;
+
+    uint8_t zeros[REPORT_SIZE - sizeof(report_header_t) - sizeof(report_footer_t) - 2];
+
+    report_footer_t footer;
+} __attribute__((packed));
+#define REPORT_SIZE_FIRMWARE_VERSION 0x2
+#define COMMAND_REPORT_FIRMWARE_VERSION 0x81
+static_assert(sizeof(struct REPORT_FIRMWARE_VERSION) == REPORT_SIZE, "REPORT_FIRMWARE_VERSION is not of the right size");
+
+struct REPORT_POLLING_RATE
+{
+    report_header_t header;
+
+    // There is another report for up to 8000Hz polling
+    // 0x01: 1000Hz, 0x2: 500Hz, 0x3: 125Hz
+    uint8_t polling_rate;
+
+    uint8_t zeros[REPORT_SIZE - sizeof(report_header_t) - sizeof(report_footer_t) - 1];
+
+    report_footer_t footer;
+} __attribute__((packed));
+static_assert(sizeof(struct REPORT_POLLING_RATE) == REPORT_SIZE, "REPORT_POLLING_RATE is not of the right size");
+#define REPORT_SIZE_POLLING_RATE 0x1
+#define COMMAND_REPORT_POLLING_RATE 0x85
+
+/* Commands of the DPI (0x4) class */
+#define COMMAND_CLASS_DPI 0x4
+
+struct REPORT_DPI
+{
+    report_header_t header;
+
+    uint8_t variable_storage;
+    uint8_t dpi_x_high;
+    uint8_t dpi_x_low;
+    uint8_t dpi_y_high;
+    uint8_t dpi_y_low;
+    uint8_t unknown_0;
+    uint8_t unknown_1;
+
+    uint8_t zeros[REPORT_SIZE - sizeof(report_header_t) - sizeof(report_footer_t) - 7];
+
+    report_footer_t footer;
+} __attribute__((packed));
+static_assert(sizeof(struct REPORT_DPI) == REPORT_SIZE, "REPORT_DPI is not of the right size");
+#define REPORT_SIZE_DPI 0x07
+#define COMMAND_REPORT_DPI 0x85
+
+typedef struct DPI_STAGE
+{
+    uint8_t stage_index;
+    uint8_t dpi_x_high;
+    uint8_t dpi_x_low;
+    uint8_t dpi_y_high;
+    uint8_t dpi_y_low;
+    uint8_t unknown_0;
+    uint8_t unknown_1;
+} __attribute__((packed)) dpi_stage_t;
+struct REPORT_DPI_STAGES
+{
+    report_header_t header;
+
+    uint8_t variable_storage;
+    uint8_t active_dpi_stage;
+    uint8_t dpi_stages_count;
+
+    dpi_stage_t stages[5];
+
+    uint8_t zeros[REPORT_SIZE - sizeof(report_header_t) - sizeof(report_footer_t) - 38];
+
+    report_footer_t footer;
+} __attribute__((packed));
+static_assert(sizeof(struct REPORT_DPI_STAGES) == REPORT_SIZE, "REPORT_DPI_STAGES is not of the right size");
+#define REPORT_SIZE_DPI_STAGES 0x26
+#define COMMAND_REPORT_DPI_STAGES 0x86
+
+/* Commands of the BATTERY (0x7) class */
+#define COMMAND_CLASS_BATTERY 0x7
+
+struct REPORT_BATTERY_LEVEL
+{
+    report_header_t header;
+
+    uint8_t ignored;
+    uint8_t battery_level; // 0-255
+
+    report_footer_t footer;
+} __attribute__((packed));
+#define REPORT_SIZE_BATTERY_LEVEL 0x2
+#define COMMAND_REPORT_BATTERY_LEVEL 0x80
+
+struct REPORT_BATTERY_STATUS
+{
+    report_header_t header;
+
+    uint8_t ignored;
+    uint8_t charging; // 0: not charging, 1:charging
+
+    report_footer_t footer;
+} __attribute__((packed));
+#define REPORT_SIZE_BATTERY_STATUS 0x2
+#define COMMAND_REPORT_BATTERY_STATUS 0x84
+
+
+#endif

drivers/razer/viper_mini.h

@@ -0,0 +1,8 @@
+#ifndef VIPER_MINI_H
+#define VIPER_MINI_H
+
+#define VIPER_MINI_PRODUCT_ID 0x008a
+#define VIPER_MINI_NAME "Viper Mini"
+#define VIPER_MINI_IMAGE "razer-viper_mini.png"
+
+#endif