From e2faf04f8f6deefa10710b52756aaebc1ee1f6f2 Mon Sep 17 00:00:00 2001 From: Peter Wu Date: Tue, 30 Apr 2013 17:40:53 +0200 Subject: ltunify: preliminary HID++ 2.0 support, add TODO --- hidpp20.c | 156 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 156 insertions(+) create mode 100644 hidpp20.c (limited to 'hidpp20.c') diff --git a/hidpp20.c b/hidpp20.c new file mode 100644 index 0000000..06e8ad2 --- /dev/null +++ b/hidpp20.c @@ -0,0 +1,156 @@ +#include +#include +#include +#include +#include + +typedef unsigned char u8; + +#define SHORT_MESSAGE 0x10 +#define LONG_MESSAGE 0x11 + +struct hidpp2_message { + u8 report_id; + u8 device_index; + u8 feature_index; +#define HIDPP_SET_FUNC(msg, func) ((msg)->func_swId |= ((func) << 4)) + u8 func_swId; + u8 params[16]; // 3 or 16 params +} __attribute__((__packed__)); + +struct feature { + uint16_t featureId; +#define FEAT_TYPE_MASK 0xc0 +#define FEAT_TYPE_OBSOLETE 0x80 +#define FEAT_TYPE_SWHIDDEN 0x40 + u8 featureType; +}; + +#define SOFTWARE_ID 0x04 /* getRandom() -- guaranteed to be random. */ + +#define FEATURE_INDEX_IROOT 0x00 + +#define FID_IFEATURESET 0x0001 +static +const char * +get_feature_name(uint16_t featureId) { + switch (featureId) { + case 0x0000: return "IRoot"; + case FID_IFEATURESET: return "IFeatureSet"; + case 0x0003: return "IFirmwareInfo"; + case 0x0005: return "GetDeviceNameType"; + case 0x1000: return "batteryLevelStatus"; + case 0x1B00: return "SpecialKeysMSEButtons"; + case 0x1D4B: return "WirelessDeviceStatus"; + default: return "unknown"; + } +} + +/** + * Initialize common values of a HID++ 2.0 message: report_id, device_index and + * software ID. Remaining fields: feature_index, func, params. + */ +#define INIT_HIDPP_SHORT(msg, dev_index) \ + memset((msg), 0, sizeof *(msg)); \ + (msg)->report_id = SHORT_MESSAGE; \ + (msg)->device_index = dev_index; \ + (msg)->func_swId = SOFTWARE_ID + +static +bool +do_hidpp2_request(int fd, struct hidpp2_message *msg) { + struct hidpp_message *hid10_message = (struct hidpp_message *) msg; + + if (!do_write(fd, hid10_message)) { + return false; + } + + // use do_read_skippy in case there are interleaving notifications + // sub id is feature index in HID++ 2.0 + if (!do_read_skippy(fd, hid10_message, 0x11, hid10_message->sub_id)) { + puts("WTF"); + return false; + } + + return true; +} + +// Returns feature index for featureId +static +u8 +get_feature(int fd, u8 device_index, uint16_t featureId) { + struct hidpp2_message msg; + INIT_HIDPP_SHORT(&msg, device_index); + msg.feature_index = FEATURE_INDEX_IROOT; + HIDPP_SET_FUNC(&msg, 0); // GetFeature(featureId) + msg.params[0] = featureId >> 8; + msg.params[1] = featureId & 0xFF; + if (!do_hidpp2_request(fd, &msg)) { + return 0; + } + return msg.params[0]; +} + +// Returns number of features or 0 on error. +static +u8 +get_feature_count(int fd, u8 device_index, u8 ifeatIndex) { + struct hidpp2_message msg; + INIT_HIDPP_SHORT(&msg, device_index); + // XXX: is this variable? Can't it be hard-coded to 0x01? + msg.feature_index = ifeatIndex; + HIDPP_SET_FUNC(&msg, 0); // GetCount() + if (!do_hidpp2_request(fd, &msg)) { + fprintf(stderr, "Failed to request features count\n"); + return 0; + } + return msg.params[0]; +} + +// Get featureId and type for a given featureIndex. +static +bool +get_featureId(int fd, u8 device_index, u8 ifeatIndex, u8 featureIndex, struct feature *feat) { + struct hidpp2_message msg; + INIT_HIDPP_SHORT(&msg, device_index); + // XXX: is this variable? Can't it be hard-coded to 0x01? + msg.feature_index = ifeatIndex; + HIDPP_SET_FUNC(&msg, 1); // GetFeatureId(featureIndex) + msg.params[0] = featureIndex; + if (!do_hidpp2_request(fd, &msg)) { + return false; + } + feat->featureId = (msg.params[0] << 8) | msg.params[1]; + feat->featureType = msg.params[2]; + return true; +} + +void +hidpp20_print_features(int fd, u8 device_index) { + u8 i, count, ifeatIndex; + + ifeatIndex = get_feature(fd, device_index, FID_IFEATURESET); + if (!ifeatIndex) { + fprintf(stderr, "Failed to get feature information\n"); + return; + } + count = get_feature_count(fd, device_index, ifeatIndex); + + printf("Total number of HID++ 2.0 features: %i\n", count); + for (i = 0; i <= count; i++) { + struct feature feat; + if (get_featureId(fd, device_index, ifeatIndex, i, &feat)) { + printf(" %2i: [%04X] %c%c %s\n", i, feat.featureId, + feat.featureType & FEAT_TYPE_OBSOLETE ? 'O' : ' ', + feat.featureType & FEAT_TYPE_SWHIDDEN ? 'H' : ' ', + get_feature_name(feat.featureId)); + if (feat.featureType & ~FEAT_TYPE_MASK) { + printf("Warning: unrecognized feature flags: %#04x\n", + feat.featureType & ~FEAT_TYPE_MASK); + } + } else { + fprintf(stderr, "Failed to get feature, is device connected?\n"); + } + } + puts("(O = obsolete feature; H = SW hidden feature)"); +} -- cgit v1.2.1