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Add driver mechanism so we can have several distinct backends

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Inspired from the kernel mechanism.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>
This commit is contained in:
Benjamin Tissoires
2015-08-14 17:36:36 -04:00
parent 3188b97f9c
commit ca4af6f359
2 changed files with 76 additions and 1 deletions
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25
src/libratbag-private.h
View File

@@ -24,11 +24,36 @@
#ifndef LIBRATBAG_PRIVATE_H
#define LIBRATBAG_PRIVATE_H
#include <linux/input.h>
#include "libratbag.h"
#include "libratbag-util.h"
#define BUS_ANY 0xffff
#define VENDOR_ANY 0xffff
#define PRODUCT_ANY 0xffff
#define VERSION_ANY 0xffff
struct ratbag_driver;
struct ratbag {
int evdev_fd;
int refcount;
struct ratbag_driver *driver;
};
struct ratbag_id {
struct input_id id;
unsigned long data;
};
struct ratbag_driver {
char *name;
const struct ratbag_id *table_ids;
/* private */
struct list link;
};
void ratbag_device_init(struct ratbag *rb, int fd);

52
src/libratbag.c
View File

@@ -24,7 +24,7 @@
#include "config.h"
#include <assert.h>
#include <errno.h>
#include <linux/input.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
@@ -33,6 +33,8 @@
#include "libratbag-util.h"
struct libratbag {
struct list drivers;
int refcount;
libratbag_log_handler log_handler;
enum libratbag_log_priority log_priority;
@@ -86,12 +88,45 @@ ratbag_device_init(struct ratbag *rb, int fd)
rb->refcount = 1;
}
static inline bool
ratbag_match_id(const struct input_id *dev_id, const struct input_id *match_id)
{
return (match_id->bustype == BUS_ANY || match_id->bustype == dev_id->bustype) &&
(match_id->vendor == VENDOR_ANY || match_id->vendor == dev_id->vendor) &&
(match_id->product == PRODUCT_ANY || match_id->product == dev_id->product) &&
(match_id->version == VERSION_ANY || match_id->version == dev_id->version);
}
static struct ratbag_driver *
ratbag_find_driver(struct libratbag *libratbag, const struct input_id *dev_id)
{
struct ratbag_driver *driver;
const struct ratbag_id *matching_id;
list_for_each(driver, &libratbag->drivers, link) {
log_debug(libratbag, "testing against %s\n", driver->name);
matching_id = driver->table_ids;
do {
if (ratbag_match_id(dev_id, &matching_id->id)) {
return driver;
}
matching_id++;
} while (matching_id->id.bustype != 0 ||
matching_id->id.vendor != 0 ||
matching_id->id.product != 0 ||
matching_id->id.version != 0);
}
return NULL;
}
LIBRATBAG_EXPORT struct ratbag*
ratbag_new_from_fd(struct libratbag *libratbag, int fd)
{
int rc;
struct input_id ids;
struct ratbag *ratbag = NULL;
struct ratbag_driver *driver;
if (!libratbag) {
fprintf(stderr, "libratbag is NULL\n");
@@ -108,6 +143,14 @@ ratbag_new_from_fd(struct libratbag *libratbag, int fd)
ratbag_device_init(ratbag, fd);
driver = ratbag_find_driver(libratbag, &ids);
if (!driver) {
errno = ENOTSUP;
goto out_err;
}
ratbag->driver = driver;
return ratbag;
out_err:
@@ -130,6 +173,12 @@ ratbag_unref(struct ratbag *ratbag)
return NULL;
}
static void
ratbag_register_driver(struct libratbag *libratbag, struct ratbag_driver *driver)
{
list_insert(&libratbag->drivers, &driver->link);
}
LIBRATBAG_EXPORT struct libratbag *
libratbag_create_context(void)
{
@@ -141,6 +190,7 @@ libratbag_create_context(void)
libratbag->refcount = 1;
list_init(&libratbag->drivers);
libratbag->log_handler = libratbag_default_log_func;
libratbag->log_priority = LIBRATBAG_LOG_PRIORITY_DEBUG;