From 308e7f2fecf5accbc543794ba5d8adb145837e0f Mon Sep 17 00:00:00 2001 From: Sam Lantinga Date: Sat, 23 Nov 2019 12:11:20 -0800 Subject: [PATCH] Linux hidapi code dynamically loads udev --- src/hidapi/linux/hid.c | 84 ++++++++++++++++++++++++------------------ 1 file changed, 48 insertions(+), 36 deletions(-) diff --git a/src/hidapi/linux/hid.c b/src/hidapi/linux/hid.c index 2cc2d8b98..bde15dac4 100644 --- a/src/hidapi/linux/hid.c +++ b/src/hidapi/linux/hid.c @@ -48,7 +48,8 @@ #include #include #include -#include +//#include +#include "../../core/linux/SDL_udev.h" #include "hidapi.h" @@ -66,6 +67,8 @@ namespace NAMESPACE #define HIDIOCGFEATURE(len) _IOC(_IOC_WRITE|_IOC_READ, 'H', 0x07, len) #endif +static const SDL_UDEV_Symbols *udev_syms; + /* USB HID device property names */ const char *device_string_names[] = { "manufacturer", @@ -147,7 +150,7 @@ static wchar_t *utf8_to_wchar_t(const char *utf8) string. The returned string must be freed with free() when done.*/ static wchar_t *copy_udev_string(struct udev_device *dev, const char *udev_name) { - return utf8_to_wchar_t(udev_device_get_sysattr_value(dev, udev_name)); + return utf8_to_wchar_t(udev_syms->udev_device_get_sysattr_value(dev, udev_name)); } /* uses_numbered_reports() returns 1 if report_descriptor describes a device @@ -277,7 +280,7 @@ static int is_bluetooth(hid_device *dev) int ret = -1; /* Create the udev object */ - udev = udev_new(); + udev = udev_syms->udev_new(); if (!udev) { printf("Can't create udev\n"); return -1; @@ -286,14 +289,14 @@ static int is_bluetooth(hid_device *dev) /* Get the dev_t (major/minor numbers) from the file handle. */ ret = fstat(dev->device_handle, &s); if (-1 == ret) { - udev_unref(udev); + udev_syms->udev_unref(udev); return ret; } /* Open a udev device from the dev_t. 'c' means character device. */ - udev_dev = udev_device_new_from_devnum(udev, 'c', s.st_rdev); + udev_dev = udev_syms->udev_device_new_from_devnum(udev, 'c', s.st_rdev); if (udev_dev) { - hid_dev = udev_device_get_parent_with_subsystem_devtype( + hid_dev = udev_syms->udev_device_get_parent_with_subsystem_devtype( udev_dev, "hid", NULL); @@ -305,7 +308,7 @@ static int is_bluetooth(hid_device *dev) char *product_name_utf8 = NULL; ret = parse_uevent_info( - udev_device_get_sysattr_value(hid_dev, "uevent"), + udev_syms->udev_device_get_sysattr_value(hid_dev, "uevent"), &bus_type, &dev_vid, &dev_pid, @@ -319,10 +322,10 @@ static int is_bluetooth(hid_device *dev) /* hid_dev doesn't need to be (and can't be) unref'd. I'm not sure why, but it'll throw double-free() errors. */ } - udev_device_unref(udev_dev); + udev_syms->udev_device_unref(udev_dev); } - udev_unref(udev); + udev_syms->udev_unref(udev); return ret; } @@ -339,7 +342,7 @@ static int get_device_string(hid_device *dev, enum device_string_id key, wchar_t char *tmp; /* Create the udev object */ - udev = udev_new(); + udev = udev_syms->udev_new(); if (!udev) { printf("Can't create udev\n"); return -1; @@ -348,13 +351,13 @@ static int get_device_string(hid_device *dev, enum device_string_id key, wchar_t /* Get the dev_t (major/minor numbers) from the file handle. */ ret = fstat(dev->device_handle, &s); if (-1 == ret) { - udev_unref(udev); + udev_syms->udev_unref(udev); return ret; } /* Open a udev device from the dev_t. 'c' means character device. */ - udev_dev = udev_device_new_from_devnum(udev, 'c', s.st_rdev); + udev_dev = udev_syms->udev_device_new_from_devnum(udev, 'c', s.st_rdev); if (udev_dev) { - hid_dev = udev_device_get_parent_with_subsystem_devtype( + hid_dev = udev_syms->udev_device_get_parent_with_subsystem_devtype( udev_dev, "hid", NULL); @@ -365,7 +368,7 @@ static int get_device_string(hid_device *dev, enum device_string_id key, wchar_t size_t retm; ret = parse_uevent_info( - udev_device_get_sysattr_value(hid_dev, "uevent"), + udev_syms->udev_device_get_sysattr_value(hid_dev, "uevent"), &bus_type, &dev_vid, &dev_pid, @@ -401,7 +404,7 @@ static int get_device_string(hid_device *dev, enum device_string_id key, wchar_t } else { /* This is a USB device. Find its parent USB Device node. */ - parent = udev_device_get_parent_with_subsystem_devtype( + parent = udev_syms->udev_device_get_parent_with_subsystem_devtype( udev_dev, "usb", "usb_device"); @@ -416,7 +419,7 @@ static int get_device_string(hid_device *dev, enum device_string_id key, wchar_t goto end; } - str = udev_device_get_sysattr_value(parent, key_str); + str = udev_syms->udev_device_get_sysattr_value(parent, key_str); if (str) { /* Convert the string from UTF-8 to wchar_t */ retm = mbstowcs(string, str, maxlen); @@ -432,10 +435,10 @@ end: free(serial_number_utf8); free(product_name_utf8); - udev_device_unref(udev_dev); + udev_syms->udev_device_unref(udev_dev); /* parent and hid_dev don't need to be (and can't be) unref'd. I'm not sure why, but they'll throw double-free() errors. */ - udev_unref(udev); + udev_syms->udev_unref(udev); return ret; } @@ -451,11 +454,17 @@ int HID_API_EXPORT hid_init(void) kernel_version = detect_kernel_version(); + udev_syms = SDL_UDEV_GetUdevSyms(); + if (!udev_syms) + return -1; + return 0; } int HID_API_EXPORT hid_exit(void) { + SDL_UDEV_ReleaseUdevSyms(); + /* Nothing to do for this in the Linux/hidraw implementation. */ return 0; } @@ -474,20 +483,23 @@ struct hid_device_info HID_API_EXPORT *hid_enumerate(unsigned short vendor_id, hid_init(); /* Create the udev object */ - udev = udev_new(); + udev = udev_syms->udev_new(); if (!udev) { printf("Can't create udev\n"); return NULL; } /* Create a list of the devices in the 'hidraw' subsystem. */ - enumerate = udev_enumerate_new(udev); - udev_enumerate_add_match_subsystem(enumerate, "hidraw"); - udev_enumerate_scan_devices(enumerate); - devices = udev_enumerate_get_list_entry(enumerate); + enumerate = udev_syms->udev_enumerate_new(udev); + udev_syms->udev_enumerate_add_match_subsystem(enumerate, "hidraw"); + udev_syms->udev_enumerate_scan_devices(enumerate); + devices = udev_syms->udev_enumerate_get_list_entry(enumerate); /* For each item, see if it matches the vid/pid, and if so create a udev_device record for it */ - udev_list_entry_foreach(dev_list_entry, devices) { + for (dev_list_entry = devices; + dev_list_entry; + dev_list_entry = udev_syms->udev_list_entry_get_next(dev_list_entry)) { + const char *sysfs_path; const char *dev_path; const char *str; @@ -504,11 +516,11 @@ struct hid_device_info HID_API_EXPORT *hid_enumerate(unsigned short vendor_id, /* Get the filename of the /sys entry for the device and create a udev_device object (dev) representing it */ - sysfs_path = udev_list_entry_get_name(dev_list_entry); - raw_dev = udev_device_new_from_syspath(udev, sysfs_path); - dev_path = udev_device_get_devnode(raw_dev); + sysfs_path = udev_syms->udev_list_entry_get_name(dev_list_entry); + raw_dev = udev_syms->udev_device_new_from_syspath(udev, sysfs_path); + dev_path = udev_syms->udev_device_get_devnode(raw_dev); - hid_dev = udev_device_get_parent_with_subsystem_devtype( + hid_dev = udev_syms->udev_device_get_parent_with_subsystem_devtype( raw_dev, "hid", NULL); @@ -519,7 +531,7 @@ struct hid_device_info HID_API_EXPORT *hid_enumerate(unsigned short vendor_id, } result = parse_uevent_info( - udev_device_get_sysattr_value(hid_dev, "uevent"), + udev_syms->udev_device_get_sysattr_value(hid_dev, "uevent"), &bus_type, &dev_vid, &dev_pid, @@ -582,7 +594,7 @@ struct hid_device_info HID_API_EXPORT *hid_enumerate(unsigned short vendor_id, subsystem/devtype pair of "usb"/"usb_device". This will be several levels up the tree, but the function will find it. */ - usb_dev = udev_device_get_parent_with_subsystem_devtype( + usb_dev = udev_syms->udev_device_get_parent_with_subsystem_devtype( raw_dev, "usb", "usb_device"); @@ -610,16 +622,16 @@ struct hid_device_info HID_API_EXPORT *hid_enumerate(unsigned short vendor_id, cur_dev->product_string = copy_udev_string(usb_dev, device_string_names[DEVICE_STRING_PRODUCT]); /* Release Number */ - str = udev_device_get_sysattr_value(usb_dev, "bcdDevice"); + str = udev_syms->udev_device_get_sysattr_value(usb_dev, "bcdDevice"); cur_dev->release_number = (str)? strtol(str, NULL, 16): 0x0; /* Get a handle to the interface's udev node. */ - intf_dev = udev_device_get_parent_with_subsystem_devtype( + intf_dev = udev_syms->udev_device_get_parent_with_subsystem_devtype( raw_dev, "usb", "usb_interface"); if (intf_dev) { - str = udev_device_get_sysattr_value(intf_dev, "bInterfaceNumber"); + str = udev_syms->udev_device_get_sysattr_value(intf_dev, "bInterfaceNumber"); cur_dev->interface_number = (str)? strtol(str, NULL, 16): -1; } @@ -642,14 +654,14 @@ struct hid_device_info HID_API_EXPORT *hid_enumerate(unsigned short vendor_id, next: free(serial_number_utf8); free(product_name_utf8); - udev_device_unref(raw_dev); + udev_syms->udev_device_unref(raw_dev); /* hid_dev, usb_dev and intf_dev don't need to be (and can't be) unref()d. It will cause a double-free() error. I'm not sure why. */ } /* Free the enumerator and udev objects. */ - udev_enumerate_unref(enumerate); - udev_unref(udev); + udev_syms->udev_enumerate_unref(enumerate); + udev_syms->udev_unref(udev); return root; }