diff options
Diffstat (limited to 'drivers/hid')
| -rw-r--r-- | drivers/hid/hid-logitech-hidpp.c | 36 |
1 files changed, 32 insertions, 4 deletions
diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c index 8d2d54b527b0..61f9e75c45d2 100644 --- a/drivers/hid/hid-logitech-hidpp.c +++ b/drivers/hid/hid-logitech-hidpp.c @@ -151,6 +151,14 @@ static int __hidpp_send_report(struct hid_device *hdev, return ret == fields_count ? 0 : -1; } +/** + * hidpp_send_message_sync() returns 0 in case of success, and something else + * in case of a failure. + * - If ' something else' is positive, that means that an error has been raised + * by the protocol itself. + * - If ' something else' is negative, that means that we had a classic error + * (-ENOMEM, -EPIPE, etc...) + */ static int hidpp_send_message_sync(struct hidpp_device *hidpp, struct hidpp_report *message, struct hidpp_report *response) @@ -359,8 +367,13 @@ static int hidpp_root_get_protocol_version(struct hidpp_device *hidpp) return 0; } + if (ret > 0) { + hid_err(hidpp->hid_dev, "%s: received protocol error 0x%02x\n", + __func__, ret); + return -EPROTO; + } if (ret) - return -ret; + return ret; hidpp->protocol_major = response.fap.params[0]; hidpp->protocol_minor = response.fap.params[1]; @@ -398,8 +411,13 @@ static int hidpp_devicenametype_get_count(struct hidpp_device *hidpp, ret = hidpp_send_fap_command_sync(hidpp, feature_index, CMD_GET_DEVICE_NAME_TYPE_GET_COUNT, NULL, 0, &response); + if (ret > 0) { + hid_err(hidpp->hid_dev, "%s: received protocol error 0x%02x\n", + __func__, ret); + return -EPROTO; + } if (ret) - return -ret; + return ret; *nameLength = response.fap.params[0]; @@ -417,8 +435,13 @@ static int hidpp_devicenametype_get_device_name(struct hidpp_device *hidpp, CMD_GET_DEVICE_NAME_TYPE_GET_DEVICE_NAME, &char_index, 1, &response); + if (ret > 0) { + hid_err(hidpp->hid_dev, "%s: received protocol error 0x%02x\n", + __func__, ret); + return -EPROTO; + } if (ret) - return -ret; + return ret; if (response.report_id == REPORT_ID_HIDPP_LONG) count = HIDPP_REPORT_LONG_LENGTH - 4; @@ -524,8 +547,13 @@ static int hidpp_touchpad_get_raw_info(struct hidpp_device *hidpp, ret = hidpp_send_fap_command_sync(hidpp, feature_index, CMD_TOUCHPAD_GET_RAW_INFO, NULL, 0, &response); + if (ret > 0) { + hid_err(hidpp->hid_dev, "%s: received protocol error 0x%02x\n", + __func__, ret); + return -EPROTO; + } if (ret) - return -ret; + return ret; raw_info->x_size = get_unaligned_be16(¶ms[0]); raw_info->y_size = get_unaligned_be16(¶ms[2]); |