--- /dev/null
+/*
+ * HIDPP protocol for Logitech Unifying receivers
+ *
+ * Copyright (c) 2011 Logitech (c)
+ * Copyright (c) 2012-2013 Google (c)
+ * Copyright (c) 2013-2014 Red Hat Inc.
+ */
+
+/*
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; version 2 of the License.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/device.h>
+#include <linux/hid.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/sched.h>
+#include <linux/kfifo.h>
+#include <linux/input/mt.h>
+#include <asm/unaligned.h>
+#include "hid-ids.h"
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
+MODULE_AUTHOR("Nestor Lopez Casado <nlopezcasad@logitech.com>");
+
+static bool disable_raw_mode;
+module_param(disable_raw_mode, bool, 0644);
+MODULE_PARM_DESC(disable_raw_mode,
+ "Disable Raw mode reporting for touchpads and keep firmware gestures.");
+
+#define REPORT_ID_HIDPP_SHORT 0x10
+#define REPORT_ID_HIDPP_LONG 0x11
+
+#define HIDPP_REPORT_SHORT_LENGTH 7
+#define HIDPP_REPORT_LONG_LENGTH 20
+
+#define HIDPP_QUIRK_CLASS_WTP BIT(0)
+
+/* bits 1..20 are reserved for classes */
+#define HIDPP_QUIRK_DELAYED_INIT BIT(21)
+#define HIDPP_QUIRK_WTP_PHYSICAL_BUTTONS BIT(22)
+
+/*
+ * There are two hidpp protocols in use, the first version hidpp10 is known
+ * as register access protocol or RAP, the second version hidpp20 is known as
+ * feature access protocol or FAP
+ *
+ * Most older devices (including the Unifying usb receiver) use the RAP protocol
+ * where as most newer devices use the FAP protocol. Both protocols are
+ * compatible with the underlying transport, which could be usb, Unifiying, or
+ * bluetooth. The message lengths are defined by the hid vendor specific report
+ * descriptor for the HIDPP_SHORT report type (total message lenth 7 bytes) and
+ * the HIDPP_LONG report type (total message length 20 bytes)
+ *
+ * The RAP protocol uses both report types, whereas the FAP only uses HIDPP_LONG
+ * messages. The Unifying receiver itself responds to RAP messages (device index
+ * is 0xFF for the receiver), and all messages (short or long) with a device
+ * index between 1 and 6 are passed untouched to the corresponding paired
+ * Unifying device.
+ *
+ * The paired device can be RAP or FAP, it will receive the message untouched
+ * from the Unifiying receiver.
+ */
+
+struct fap {
+ u8 feature_index;
+ u8 funcindex_clientid;
+ u8 params[HIDPP_REPORT_LONG_LENGTH - 4U];
+};
+
+struct rap {
+ u8 sub_id;
+ u8 reg_address;
+ u8 params[HIDPP_REPORT_LONG_LENGTH - 4U];
+};
+
+struct hidpp_report {
+ u8 report_id;
+ u8 device_index;
+ union {
+ struct fap fap;
+ struct rap rap;
+ u8 rawbytes[sizeof(struct fap)];
+ };
+} __packed;
+
+struct hidpp_device {
+ struct hid_device *hid_dev;
+ struct mutex send_mutex;
+ void *send_receive_buf;
+ char *name; /* will never be NULL and should not be freed */
+ wait_queue_head_t wait;
+ bool answer_available;
+ u8 protocol_major;
+ u8 protocol_minor;
+
+ void *private_data;
+
+ struct work_struct work;
+ struct kfifo delayed_work_fifo;
+ atomic_t connected;
+ struct input_dev *delayed_input;
+
+ unsigned long quirks;
+};
+
+
+/* HID++ 1.0 error codes */
+#define HIDPP_ERROR 0x8f
+#define HIDPP_ERROR_SUCCESS 0x00
+#define HIDPP_ERROR_INVALID_SUBID 0x01
+#define HIDPP_ERROR_INVALID_ADRESS 0x02
+#define HIDPP_ERROR_INVALID_VALUE 0x03
+#define HIDPP_ERROR_CONNECT_FAIL 0x04
+#define HIDPP_ERROR_TOO_MANY_DEVICES 0x05
+#define HIDPP_ERROR_ALREADY_EXISTS 0x06
+#define HIDPP_ERROR_BUSY 0x07
+#define HIDPP_ERROR_UNKNOWN_DEVICE 0x08
+#define HIDPP_ERROR_RESOURCE_ERROR 0x09
+#define HIDPP_ERROR_REQUEST_UNAVAILABLE 0x0a
+#define HIDPP_ERROR_INVALID_PARAM_VALUE 0x0b
+#define HIDPP_ERROR_WRONG_PIN_CODE 0x0c
+/* HID++ 2.0 error codes */
+#define HIDPP20_ERROR 0xff
+
+static void hidpp_connect_event(struct hidpp_device *hidpp_dev);
+
+static int __hidpp_send_report(struct hid_device *hdev,
+ struct hidpp_report *hidpp_report)
+{
+ int fields_count, ret;
+
+ switch (hidpp_report->report_id) {
+ case REPORT_ID_HIDPP_SHORT:
+ fields_count = HIDPP_REPORT_SHORT_LENGTH;
+ break;
+ case REPORT_ID_HIDPP_LONG:
+ fields_count = HIDPP_REPORT_LONG_LENGTH;
+ break;
+ default:
+ return -ENODEV;
+ }
+
+ /*
+ * set the device_index as the receiver, it will be overwritten by
+ * hid_hw_request if needed
+ */
+ hidpp_report->device_index = 0xff;
+
+ ret = hid_hw_raw_request(hdev, hidpp_report->report_id,
+ (u8 *)hidpp_report, fields_count, HID_OUTPUT_REPORT,
+ HID_REQ_SET_REPORT);
+
+ 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)
+{
+ int ret;
+
+ mutex_lock(&hidpp->send_mutex);
+
+ hidpp->send_receive_buf = response;
+ hidpp->answer_available = false;
+
+ /*
+ * So that we can later validate the answer when it arrives
+ * in hidpp_raw_event
+ */
+ *response = *message;
+
+ ret = __hidpp_send_report(hidpp->hid_dev, message);
+
+ if (ret) {
+ dbg_hid("__hidpp_send_report returned err: %d\n", ret);
+ memset(response, 0, sizeof(struct hidpp_report));
+ goto exit;
+ }
+
+ if (!wait_event_timeout(hidpp->wait, hidpp->answer_available,
+ 5*HZ)) {
+ dbg_hid("%s:timeout waiting for response\n", __func__);
+ memset(response, 0, sizeof(struct hidpp_report));
+ ret = -ETIMEDOUT;
+ }
+
+ if (response->report_id == REPORT_ID_HIDPP_SHORT &&
+ response->rap.sub_id == HIDPP_ERROR) {
+ ret = response->rap.params[1];
+ dbg_hid("%s:got hidpp error %02X\n", __func__, ret);
+ goto exit;
+ }
+
+ if (response->report_id == REPORT_ID_HIDPP_LONG &&
+ response->fap.feature_index == HIDPP20_ERROR) {
+ ret = response->fap.params[1];
+ dbg_hid("%s:got hidpp 2.0 error %02X\n", __func__, ret);
+ goto exit;
+ }
+
+exit:
+ mutex_unlock(&hidpp->send_mutex);
+ return ret;
+
+}
+
+static int hidpp_send_fap_command_sync(struct hidpp_device *hidpp,
+ u8 feat_index, u8 funcindex_clientid, u8 *params, int param_count,
+ struct hidpp_report *response)
+{
+ struct hidpp_report *message;
+ int ret;
+
+ if (param_count > sizeof(message->fap.params))
+ return -EINVAL;
+
+ message = kzalloc(sizeof(struct hidpp_report), GFP_KERNEL);
+ if (!message)
+ return -ENOMEM;
+ message->report_id = REPORT_ID_HIDPP_LONG;
+ message->fap.feature_index = feat_index;
+ message->fap.funcindex_clientid = funcindex_clientid;
+ memcpy(&message->fap.params, params, param_count);
+
+ ret = hidpp_send_message_sync(hidpp, message, response);
+ kfree(message);
+ return ret;
+}
+
+static int hidpp_send_rap_command_sync(struct hidpp_device *hidpp_dev,
+ u8 report_id, u8 sub_id, u8 reg_address, u8 *params, int param_count,
+ struct hidpp_report *response)
+{
+ struct hidpp_report *message;
+ int ret;
+
+ if ((report_id != REPORT_ID_HIDPP_SHORT) &&
+ (report_id != REPORT_ID_HIDPP_LONG))
+ return -EINVAL;
+
+ if (param_count > sizeof(message->rap.params))
+ return -EINVAL;
+
+ message = kzalloc(sizeof(struct hidpp_report), GFP_KERNEL);
+ if (!message)
+ return -ENOMEM;
+ message->report_id = report_id;
+ message->rap.sub_id = sub_id;
+ message->rap.reg_address = reg_address;
+ memcpy(&message->rap.params, params, param_count);
+
+ ret = hidpp_send_message_sync(hidpp_dev, message, response);
+ kfree(message);
+ return ret;
+}
+
+static void delayed_work_cb(struct work_struct *work)
+{
+ struct hidpp_device *hidpp = container_of(work, struct hidpp_device,
+ work);
+ hidpp_connect_event(hidpp);
+}
+
+static inline bool hidpp_match_answer(struct hidpp_report *question,
+ struct hidpp_report *answer)
+{
+ return (answer->fap.feature_index == question->fap.feature_index) &&
+ (answer->fap.funcindex_clientid == question->fap.funcindex_clientid);
+}
+
+static inline bool hidpp_match_error(struct hidpp_report *question,
+ struct hidpp_report *answer)
+{
+ return ((answer->rap.sub_id == HIDPP_ERROR) ||
+ (answer->fap.feature_index == HIDPP20_ERROR)) &&
+ (answer->fap.funcindex_clientid == question->fap.feature_index) &&
+ (answer->fap.params[0] == question->fap.funcindex_clientid);
+}
+
+static inline bool hidpp_report_is_connect_event(struct hidpp_report *report)
+{
+ return (report->report_id == REPORT_ID_HIDPP_SHORT) &&
+ (report->rap.sub_id == 0x41);
+}
+
+/**
+ * hidpp_prefix_name() prefixes the current given name with "Logitech ".
+ */
+static void hidpp_prefix_name(char **name, int name_length)
+{
+#define PREFIX_LENGTH 9 /* "Logitech " */
+
+ int new_length;
+ char *new_name;
+
+ if (name_length > PREFIX_LENGTH &&
+ strncmp(*name, "Logitech ", PREFIX_LENGTH) == 0)
+ /* The prefix has is already in the name */
+ return;
+
+ new_length = PREFIX_LENGTH + name_length;
+ new_name = kzalloc(new_length, GFP_KERNEL);
+ if (!new_name)
+ return;
+
+ snprintf(new_name, new_length, "Logitech %s", *name);
+
+ kfree(*name);
+
+ *name = new_name;
+}
+
+/* -------------------------------------------------------------------------- */
+/* HIDP++ 1.0 commands */
+/* -------------------------------------------------------------------------- */
+
+#define HIDPP_SET_REGISTER 0x80
+#define HIDPP_GET_REGISTER 0x81
+#define HIDPP_SET_LONG_REGISTER 0x82
+#define HIDPP_GET_LONG_REGISTER 0x83
+
+#define HIDPP_REG_PAIRING_INFORMATION 0xB5
+#define DEVICE_NAME 0x40
+
+static char *hidpp_get_unifying_name(struct hidpp_device *hidpp_dev)
+{
+ struct hidpp_report response;
+ int ret;
+ /* hid-logitech-dj is in charge of setting the right device index */
+ u8 params[1] = { DEVICE_NAME };
+ char *name;
+ int len;
+
+ ret = hidpp_send_rap_command_sync(hidpp_dev,
+ REPORT_ID_HIDPP_SHORT,
+ HIDPP_GET_LONG_REGISTER,
+ HIDPP_REG_PAIRING_INFORMATION,
+ params, 1, &response);
+ if (ret)
+ return NULL;
+
+ len = response.rap.params[1];
+
+ if (2 + len > sizeof(response.rap.params))
+ return NULL;
+
+ name = kzalloc(len + 1, GFP_KERNEL);
+ if (!name)
+ return NULL;
+
+ memcpy(name, &response.rap.params[2], len);
+
+ /* include the terminating '\0' */
+ hidpp_prefix_name(&name, len + 1);
+
+ return name;
+}
+
+/* -------------------------------------------------------------------------- */
+/* 0x0000: Root */
+/* -------------------------------------------------------------------------- */
+
+#define HIDPP_PAGE_ROOT 0x0000
+#define HIDPP_PAGE_ROOT_IDX 0x00
+
+#define CMD_ROOT_GET_FEATURE 0x01
+#define CMD_ROOT_GET_PROTOCOL_VERSION 0x11
+
+static int hidpp_root_get_feature(struct hidpp_device *hidpp, u16 feature,
+ u8 *feature_index, u8 *feature_type)
+{
+ struct hidpp_report response;
+ int ret;
+ u8 params[2] = { feature >> 8, feature & 0x00FF };
+
+ ret = hidpp_send_fap_command_sync(hidpp,
+ HIDPP_PAGE_ROOT_IDX,
+ CMD_ROOT_GET_FEATURE,
+ params, 2, &response);
+ if (ret)
+ return ret;
+
+ *feature_index = response.fap.params[0];
+ *feature_type = response.fap.params[1];
+
+ return ret;
+}
+
+static int hidpp_root_get_protocol_version(struct hidpp_device *hidpp)
+{
+ struct hidpp_report response;
+ int ret;
+
+ ret = hidpp_send_fap_command_sync(hidpp,
+ HIDPP_PAGE_ROOT_IDX,
+ CMD_ROOT_GET_PROTOCOL_VERSION,
+ NULL, 0, &response);
+
+ if (ret == HIDPP_ERROR_INVALID_SUBID) {
+ hidpp->protocol_major = 1;
+ hidpp->protocol_minor = 0;
+ return 0;
+ }
+
+ /* the device might not be connected */
+ if (ret == HIDPP_ERROR_RESOURCE_ERROR)
+ return -EIO;
+
+ if (ret > 0) {
+ hid_err(hidpp->hid_dev, "%s: received protocol error 0x%02x\n",
+ __func__, ret);
+ return -EPROTO;
+ }
+ if (ret)
+ return ret;
+
+ hidpp->protocol_major = response.fap.params[0];
+ hidpp->protocol_minor = response.fap.params[1];
+
+ return ret;
+}
+
+static bool hidpp_is_connected(struct hidpp_device *hidpp)
+{
+ int ret;
+
+ ret = hidpp_root_get_protocol_version(hidpp);
+ if (!ret)
+ hid_dbg(hidpp->hid_dev, "HID++ %u.%u device connected.\n",
+ hidpp->protocol_major, hidpp->protocol_minor);
+ return ret == 0;
+}
+
+/* -------------------------------------------------------------------------- */
+/* 0x0005: GetDeviceNameType */
+/* -------------------------------------------------------------------------- */
+
+#define HIDPP_PAGE_GET_DEVICE_NAME_TYPE 0x0005
+
+#define CMD_GET_DEVICE_NAME_TYPE_GET_COUNT 0x01
+#define CMD_GET_DEVICE_NAME_TYPE_GET_DEVICE_NAME 0x11
+#define CMD_GET_DEVICE_NAME_TYPE_GET_TYPE 0x21
+
+static int hidpp_devicenametype_get_count(struct hidpp_device *hidpp,
+ u8 feature_index, u8 *nameLength)
+{
+ struct hidpp_report response;
+ int ret;
+
+ 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;
+
+ *nameLength = response.fap.params[0];
+
+ return ret;
+}
+
+static int hidpp_devicenametype_get_device_name(struct hidpp_device *hidpp,
+ u8 feature_index, u8 char_index, char *device_name, int len_buf)
+{
+ struct hidpp_report response;
+ int ret, i;
+ int count;
+
+ ret = hidpp_send_fap_command_sync(hidpp, feature_index,
+ 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;
+
+ if (response.report_id == REPORT_ID_HIDPP_LONG)
+ count = HIDPP_REPORT_LONG_LENGTH - 4;
+ else
+ count = HIDPP_REPORT_SHORT_LENGTH - 4;
+
+ if (len_buf < count)
+ count = len_buf;
+
+ for (i = 0; i < count; i++)
+ device_name[i] = response.fap.params[i];
+
+ return count;
+}
+
+static char *hidpp_get_device_name(struct hidpp_device *hidpp)
+{
+ u8 feature_type;
+ u8 feature_index;
+ u8 __name_length;
+ char *name;
+ unsigned index = 0;
+ int ret;
+
+ ret = hidpp_root_get_feature(hidpp, HIDPP_PAGE_GET_DEVICE_NAME_TYPE,
+ &feature_index, &feature_type);
+ if (ret)
+ return NULL;
+
+ ret = hidpp_devicenametype_get_count(hidpp, feature_index,
+ &__name_length);
+ if (ret)
+ return NULL;
+
+ name = kzalloc(__name_length + 1, GFP_KERNEL);
+ if (!name)
+ return NULL;
+
+ while (index < __name_length) {
+ ret = hidpp_devicenametype_get_device_name(hidpp,
+ feature_index, index, name + index,
+ __name_length - index);
+ if (ret <= 0) {
+ kfree(name);
+ return NULL;
+ }
+ index += ret;
+ }
+
+ /* include the terminating '\0' */
+ hidpp_prefix_name(&name, __name_length + 1);
+
+ return name;
+}
+
+/* -------------------------------------------------------------------------- */
+/* 0x6100: TouchPadRawXY */
+/* -------------------------------------------------------------------------- */
+
+#define HIDPP_PAGE_TOUCHPAD_RAW_XY 0x6100
+
+#define CMD_TOUCHPAD_GET_RAW_INFO 0x01
+#define CMD_TOUCHPAD_SET_RAW_REPORT_STATE 0x21
+
+#define EVENT_TOUCHPAD_RAW_XY 0x00
+
+#define TOUCHPAD_RAW_XY_ORIGIN_LOWER_LEFT 0x01
+#define TOUCHPAD_RAW_XY_ORIGIN_UPPER_LEFT 0x03
+
+struct hidpp_touchpad_raw_info {
+ u16 x_size;
+ u16 y_size;
+ u8 z_range;
+ u8 area_range;
+ u8 timestamp_unit;
+ u8 maxcontacts;
+ u8 origin;
+ u16 res;
+};
+
+struct hidpp_touchpad_raw_xy_finger {
+ u8 contact_type;
+ u8 contact_status;
+ u16 x;
+ u16 y;
+ u8 z;
+ u8 area;
+ u8 finger_id;
+};
+
+struct hidpp_touchpad_raw_xy {
+ u16 timestamp;
+ struct hidpp_touchpad_raw_xy_finger fingers[2];
+ u8 spurious_flag;
+ u8 end_of_frame;
+ u8 finger_count;
+ u8 button;
+};
+
+static int hidpp_touchpad_get_raw_info(struct hidpp_device *hidpp,
+ u8 feature_index, struct hidpp_touchpad_raw_info *raw_info)
+{
+ struct hidpp_report response;
+ int ret;
+ u8 *params = (u8 *)response.fap.params;
+
+ 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;
+
+ raw_info->x_size = get_unaligned_be16(¶ms[0]);
+ raw_info->y_size = get_unaligned_be16(¶ms[2]);
+ raw_info->z_range = params[4];
+ raw_info->area_range = params[5];
+ raw_info->maxcontacts = params[7];
+ raw_info->origin = params[8];
+ /* res is given in unit per inch */
+ raw_info->res = get_unaligned_be16(¶ms[13]) * 2 / 51;
+
+ return ret;
+}
+
+static int hidpp_touchpad_set_raw_report_state(struct hidpp_device *hidpp_dev,
+ u8 feature_index, bool send_raw_reports,
+ bool sensor_enhanced_settings)
+{
+ struct hidpp_report response;
+
+ /*
+ * Params:
+ * bit 0 - enable raw
+ * bit 1 - 16bit Z, no area
+ * bit 2 - enhanced sensitivity
+ * bit 3 - width, height (4 bits each) instead of area
+ * bit 4 - send raw + gestures (degrades smoothness)
+ * remaining bits - reserved
+ */
+ u8 params = send_raw_reports | (sensor_enhanced_settings << 2);
+
+ return hidpp_send_fap_command_sync(hidpp_dev, feature_index,
+ CMD_TOUCHPAD_SET_RAW_REPORT_STATE, ¶ms, 1, &response);
+}
+
+static void hidpp_touchpad_touch_event(u8 *data,
+ struct hidpp_touchpad_raw_xy_finger *finger)
+{
+ u8 x_m = data[0] << 2;
+ u8 y_m = data[2] << 2;
+
+ finger->x = x_m << 6 | data[1];
+ finger->y = y_m << 6 | data[3];
+
+ finger->contact_type = data[0] >> 6;
+ finger->contact_status = data[2] >> 6;
+
+ finger->z = data[4];
+ finger->area = data[5];
+ finger->finger_id = data[6] >> 4;
+}
+
+static void hidpp_touchpad_raw_xy_event(struct hidpp_device *hidpp_dev,
+ u8 *data, struct hidpp_touchpad_raw_xy *raw_xy)
+{
+ memset(raw_xy, 0, sizeof(struct hidpp_touchpad_raw_xy));
+ raw_xy->end_of_frame = data[8] & 0x01;
+ raw_xy->spurious_flag = (data[8] >> 1) & 0x01;
+ raw_xy->finger_count = data[15] & 0x0f;
+ raw_xy->button = (data[8] >> 2) & 0x01;
+
+ if (raw_xy->finger_count) {
+ hidpp_touchpad_touch_event(&data[2], &raw_xy->fingers[0]);
+ hidpp_touchpad_touch_event(&data[9], &raw_xy->fingers[1]);
+ }
+}
+
+/* ************************************************************************** */
+/* */
+/* Device Support */
+/* */
+/* ************************************************************************** */
+
+/* -------------------------------------------------------------------------- */
+/* Touchpad HID++ devices */
+/* -------------------------------------------------------------------------- */
+
+#define WTP_MANUAL_RESOLUTION 39
+
+struct wtp_data {
+ struct input_dev *input;
+ u16 x_size, y_size;
+ u8 finger_count;
+ u8 mt_feature_index;
+ u8 button_feature_index;
+ u8 maxcontacts;
+ bool flip_y;
+ unsigned int resolution;
+};
+
+static int wtp_input_mapping(struct hid_device *hdev, struct hid_input *hi,
+ struct hid_field *field, struct hid_usage *usage,
+ unsigned long **bit, int *max)
+{
+ return -1;
+}
+
+static void wtp_populate_input(struct hidpp_device *hidpp,
+ struct input_dev *input_dev, bool origin_is_hid_core)
+{
+ struct wtp_data *wd = hidpp->private_data;
+
+ __set_bit(EV_ABS, input_dev->evbit);
+ __set_bit(EV_KEY, input_dev->evbit);
+ __clear_bit(EV_REL, input_dev->evbit);
+ __clear_bit(EV_LED, input_dev->evbit);
+
+ input_set_abs_params(input_dev, ABS_MT_POSITION_X, 0, wd->x_size, 0, 0);
+ input_abs_set_res(input_dev, ABS_MT_POSITION_X, wd->resolution);
+ input_set_abs_params(input_dev, ABS_MT_POSITION_Y, 0, wd->y_size, 0, 0);
+ input_abs_set_res(input_dev, ABS_MT_POSITION_Y, wd->resolution);
+
+ /* Max pressure is not given by the devices, pick one */
+ input_set_abs_params(input_dev, ABS_MT_PRESSURE, 0, 50, 0, 0);
+
+ input_set_capability(input_dev, EV_KEY, BTN_LEFT);
+
+ if (hidpp->quirks & HIDPP_QUIRK_WTP_PHYSICAL_BUTTONS)
+ input_set_capability(input_dev, EV_KEY, BTN_RIGHT);
+ else
+ __set_bit(INPUT_PROP_BUTTONPAD, input_dev->propbit);
+
+ input_mt_init_slots(input_dev, wd->maxcontacts, INPUT_MT_POINTER |
+ INPUT_MT_DROP_UNUSED);
+
+ wd->input = input_dev;
+}
+
+static void wtp_touch_event(struct wtp_data *wd,
+ struct hidpp_touchpad_raw_xy_finger *touch_report)
+{
+ int slot;
+
+ if (!touch_report->finger_id || touch_report->contact_type)
+ /* no actual data */
+ return;
+
+ slot = input_mt_get_slot_by_key(wd->input, touch_report->finger_id);
+
+ input_mt_slot(wd->input, slot);
+ input_mt_report_slot_state(wd->input, MT_TOOL_FINGER,
+ touch_report->contact_status);
+ if (touch_report->contact_status) {
+ input_event(wd->input, EV_ABS, ABS_MT_POSITION_X,
+ touch_report->x);
+ input_event(wd->input, EV_ABS, ABS_MT_POSITION_Y,
+ wd->flip_y ? wd->y_size - touch_report->y :
+ touch_report->y);
+ input_event(wd->input, EV_ABS, ABS_MT_PRESSURE,
+ touch_report->area);
+ }
+}
+
+static void wtp_send_raw_xy_event(struct hidpp_device *hidpp,
+ struct hidpp_touchpad_raw_xy *raw)
+{
+ struct wtp_data *wd = hidpp->private_data;
+ int i;
+
+ for (i = 0; i < 2; i++)
+ wtp_touch_event(wd, &(raw->fingers[i]));
+
+ if (raw->end_of_frame &&
+ !(hidpp->quirks & HIDPP_QUIRK_WTP_PHYSICAL_BUTTONS))
+ input_event(wd->input, EV_KEY, BTN_LEFT, raw->button);
+
+ if (raw->end_of_frame || raw->finger_count <= 2) {
+ input_mt_sync_frame(wd->input);
+ input_sync(wd->input);
+ }
+}
+
+static int wtp_mouse_raw_xy_event(struct hidpp_device *hidpp, u8 *data)
+{
+ struct wtp_data *wd = hidpp->private_data;
+ u8 c1_area = ((data[7] & 0xf) * (data[7] & 0xf) +
+ (data[7] >> 4) * (data[7] >> 4)) / 2;
+ u8 c2_area = ((data[13] & 0xf) * (data[13] & 0xf) +
+ (data[13] >> 4) * (data[13] >> 4)) / 2;
+ struct hidpp_touchpad_raw_xy raw = {
+ .timestamp = data[1],
+ .fingers = {
+ {
+ .contact_type = 0,
+ .contact_status = !!data[7],
+ .x = get_unaligned_le16(&data[3]),
+ .y = get_unaligned_le16(&data[5]),
+ .z = c1_area,
+ .area = c1_area,
+ .finger_id = data[2],
+ }, {
+ .contact_type = 0,
+ .contact_status = !!data[13],
+ .x = get_unaligned_le16(&data[9]),
+ .y = get_unaligned_le16(&data[11]),
+ .z = c2_area,
+ .area = c2_area,
+ .finger_id = data[8],
+ }
+ },
+ .finger_count = wd->maxcontacts,
+ .spurious_flag = 0,
+ .end_of_frame = (data[0] >> 7) == 0,
+ .button = data[0] & 0x01,
+ };
+
+ wtp_send_raw_xy_event(hidpp, &raw);
+
+ return 1;
+}
+
+static int wtp_raw_event(struct hid_device *hdev, u8 *data, int size)
+{
+ struct hidpp_device *hidpp = hid_get_drvdata(hdev);
+ struct wtp_data *wd = hidpp->private_data;
+ struct hidpp_report *report = (struct hidpp_report *)data;
+ struct hidpp_touchpad_raw_xy raw;
+
+ if (!wd || !wd->input)
+ return 1;
+
+ switch (data[0]) {
+ case 0x02:
+ if (size < 2) {
+ hid_err(hdev, "Received HID report of bad size (%d)",
+ size);
+ return 1;
+ }
+ if (hidpp->quirks & HIDPP_QUIRK_WTP_PHYSICAL_BUTTONS) {
+ input_event(wd->input, EV_KEY, BTN_LEFT,
+ !!(data[1] & 0x01));
+ input_event(wd->input, EV_KEY, BTN_RIGHT,
+ !!(data[1] & 0x02));
+ input_sync(wd->input);
+ return 0;
+ } else {
+ if (size < 21)
+ return 1;
+ return wtp_mouse_raw_xy_event(hidpp, &data[7]);
+ }
+ case REPORT_ID_HIDPP_LONG:
+ /* size is already checked in hidpp_raw_event. */
+ if ((report->fap.feature_index != wd->mt_feature_index) ||
+ (report->fap.funcindex_clientid != EVENT_TOUCHPAD_RAW_XY))
+ return 1;
+ hidpp_touchpad_raw_xy_event(hidpp, data + 4, &raw);
+
+ wtp_send_raw_xy_event(hidpp, &raw);
+ return 0;
+ }
+
+ return 0;
+}
+
+static int wtp_get_config(struct hidpp_device *hidpp)
+{
+ struct wtp_data *wd = hidpp->private_data;
+ struct hidpp_touchpad_raw_info raw_info = {0};
+ u8 feature_type;
+ int ret;
+
+ ret = hidpp_root_get_feature(hidpp, HIDPP_PAGE_TOUCHPAD_RAW_XY,
+ &wd->mt_feature_index, &feature_type);
+ if (ret)
+ /* means that the device is not powered up */
+ return ret;
+
+ ret = hidpp_touchpad_get_raw_info(hidpp, wd->mt_feature_index,
+ &raw_info);
+ if (ret)
+ return ret;
+
+ wd->x_size = raw_info.x_size;
+ wd->y_size = raw_info.y_size;
+ wd->maxcontacts = raw_info.maxcontacts;
+ wd->flip_y = raw_info.origin == TOUCHPAD_RAW_XY_ORIGIN_LOWER_LEFT;
+ wd->resolution = raw_info.res;
+ if (!wd->resolution)
+ wd->resolution = WTP_MANUAL_RESOLUTION;
+
+ return 0;
+}
+
+static int wtp_allocate(struct hid_device *hdev, const struct hid_device_id *id)
+{
+ struct hidpp_device *hidpp = hid_get_drvdata(hdev);
+ struct wtp_data *wd;
+
+ wd = devm_kzalloc(&hdev->dev, sizeof(struct wtp_data),
+ GFP_KERNEL);
+ if (!wd)
+ return -ENOMEM;
+
+ hidpp->private_data = wd;
+
+ return 0;
+};
+
+static int wtp_connect(struct hid_device *hdev, bool connected)
+{
+ struct hidpp_device *hidpp = hid_get_drvdata(hdev);
+ struct wtp_data *wd = hidpp->private_data;
+ int ret;
+
+ if (!connected)
+ return 0;
+
+ if (!wd->x_size) {
+ ret = wtp_get_config(hidpp);
+ if (ret) {
+ hid_err(hdev, "Can not get wtp config: %d\n", ret);
+ return ret;
+ }
+ }
+
+ return hidpp_touchpad_set_raw_report_state(hidpp, wd->mt_feature_index,
+ true, true);
+}
+
+/* -------------------------------------------------------------------------- */
+/* Generic HID++ devices */
+/* -------------------------------------------------------------------------- */
+
+static int hidpp_input_mapping(struct hid_device *hdev, struct hid_input *hi,
+ struct hid_field *field, struct hid_usage *usage,
+ unsigned long **bit, int *max)
+{
+ struct hidpp_device *hidpp = hid_get_drvdata(hdev);
+
+ if (hidpp->quirks & HIDPP_QUIRK_CLASS_WTP)
+ return wtp_input_mapping(hdev, hi, field, usage, bit, max);
+
+ return 0;
+}
+
+static void hidpp_populate_input(struct hidpp_device *hidpp,
+ struct input_dev *input, bool origin_is_hid_core)
+{
+ if (hidpp->quirks & HIDPP_QUIRK_CLASS_WTP)
+ wtp_populate_input(hidpp, input, origin_is_hid_core);
+}
+
+static void hidpp_input_configured(struct hid_device *hdev,
+ struct hid_input *hidinput)
+{
+ struct hidpp_device *hidpp = hid_get_drvdata(hdev);
+ struct input_dev *input = hidinput->input;
+
+ hidpp_populate_input(hidpp, input, true);
+}
+
+static int hidpp_raw_hidpp_event(struct hidpp_device *hidpp, u8 *data,
+ int size)
+{
+ struct hidpp_report *question = hidpp->send_receive_buf;
+ struct hidpp_report *answer = hidpp->send_receive_buf;
+ struct hidpp_report *report = (struct hidpp_report *)data;
+
+ /*
+ * If the mutex is locked then we have a pending answer from a
+ * previously sent command.
+ */
+ if (unlikely(mutex_is_locked(&hidpp->send_mutex))) {
+ /*
+ * Check for a correct hidpp20 answer or the corresponding
+ * error
+ */
+ if (hidpp_match_answer(question, report) ||
+ hidpp_match_error(question, report)) {
+ *answer = *report;
+ hidpp->answer_available = true;
+ wake_up(&hidpp->wait);
+ /*
+ * This was an answer to a command that this driver sent
+ * We return 1 to hid-core to avoid forwarding the
+ * command upstream as it has been treated by the driver
+ */
+
+ return 1;
+ }
+ }
+
+ if (unlikely(hidpp_report_is_connect_event(report))) {
+ atomic_set(&hidpp->connected,
+ !(report->rap.params[0] & (1 << 6)));
+ if ((hidpp->quirks & HIDPP_QUIRK_DELAYED_INIT) &&
+ (schedule_work(&hidpp->work) == 0))
+ dbg_hid("%s: connect event already queued\n", __func__);
+ return 1;
+ }
+
+ return 0;
+}
+
+static int hidpp_raw_event(struct hid_device *hdev, struct hid_report *report,
+ u8 *data, int size)
+{
+ struct hidpp_device *hidpp = hid_get_drvdata(hdev);
+ int ret = 0;
+
+ /* Generic HID++ processing. */
+ switch (data[0]) {
+ case REPORT_ID_HIDPP_LONG:
+ if (size != HIDPP_REPORT_LONG_LENGTH) {
+ hid_err(hdev, "received hid++ report of bad size (%d)",
+ size);
+ return 1;
+ }
+ ret = hidpp_raw_hidpp_event(hidpp, data, size);
+ break;
+ case REPORT_ID_HIDPP_SHORT:
+ if (size != HIDPP_REPORT_SHORT_LENGTH) {
+ hid_err(hdev, "received hid++ report of bad size (%d)",
+ size);
+ return 1;
+ }
+ ret = hidpp_raw_hidpp_event(hidpp, data, size);
+ break;
+ }
+
+ /* If no report is available for further processing, skip calling
+ * raw_event of subclasses. */
+ if (ret != 0)
+ return ret;
+
+ if (hidpp->quirks & HIDPP_QUIRK_CLASS_WTP)
+ return wtp_raw_event(hdev, data, size);
+
+ return 0;
+}
+
+static void hidpp_overwrite_name(struct hid_device *hdev, bool use_unifying)
+{
+ struct hidpp_device *hidpp = hid_get_drvdata(hdev);
+ char *name;
+
+ if (use_unifying)
+ /*
+ * the device is connected through an Unifying receiver, and
+ * might not be already connected.
+ * Ask the receiver for its name.
+ */
+ name = hidpp_get_unifying_name(hidpp);
+ else
+ name = hidpp_get_device_name(hidpp);
+
+ if (!name)
+ hid_err(hdev, "unable to retrieve the name of the device");
+ else
+ snprintf(hdev->name, sizeof(hdev->name), "%s", name);
+
+ kfree(name);
+}
+
+static int hidpp_input_open(struct input_dev *dev)
+{
+ struct hid_device *hid = input_get_drvdata(dev);
+
+ return hid_hw_open(hid);
+}
+
+static void hidpp_input_close(struct input_dev *dev)
+{
+ struct hid_device *hid = input_get_drvdata(dev);
+
+ hid_hw_close(hid);
+}
+
+static struct input_dev *hidpp_allocate_input(struct hid_device *hdev)
+{
+ struct input_dev *input_dev = devm_input_allocate_device(&hdev->dev);
+ struct hidpp_device *hidpp = hid_get_drvdata(hdev);
+
+ if (!input_dev)
+ return NULL;
+
+ input_set_drvdata(input_dev, hdev);
+ input_dev->open = hidpp_input_open;
+ input_dev->close = hidpp_input_close;
+
+ input_dev->name = hidpp->name;
+ input_dev->phys = hdev->phys;
+ input_dev->uniq = hdev->uniq;
+ input_dev->id.bustype = hdev->bus;
+ input_dev->id.vendor = hdev->vendor;
+ input_dev->id.product = hdev->product;
+ input_dev->id.version = hdev->version;
+ input_dev->dev.parent = &hdev->dev;
+
+ return input_dev;
+}
+
+static void hidpp_connect_event(struct hidpp_device *hidpp)
+{
+ struct hid_device *hdev = hidpp->hid_dev;
+ int ret = 0;
+ bool connected = atomic_read(&hidpp->connected);
+ struct input_dev *input;
+ char *name, *devm_name;
+
+ if (hidpp->quirks & HIDPP_QUIRK_CLASS_WTP) {
+ ret = wtp_connect(hdev, connected);
+ if (ret)
+ return;
+ }
+
+ if (!connected || hidpp->delayed_input)
+ return;
+
+ if (!hidpp->protocol_major) {
+ ret = !hidpp_is_connected(hidpp);
+ if (ret) {
+ hid_err(hdev, "Can not get the protocol version.\n");
+ return;
+ }
+ }
+
+ /* the device is already connected, we can ask for its name and
+ * protocol */
+ hid_info(hdev, "HID++ %u.%u device connected.\n",
+ hidpp->protocol_major, hidpp->protocol_minor);
+
+ if (!hidpp->name || hidpp->name == hdev->name) {
+ name = hidpp_get_device_name(hidpp);
+ if (!name) {
+ hid_err(hdev,
+ "unable to retrieve the name of the device");
+ return;
+ }
+
+ devm_name = devm_kasprintf(&hdev->dev, GFP_KERNEL, "%s", name);
+ kfree(name);
+ if (!devm_name)
+ return;
+
+ hidpp->name = devm_name;
+ }
+
+ input = hidpp_allocate_input(hdev);
+ if (!input) {
+ hid_err(hdev, "cannot allocate new input device: %d\n", ret);
+ return;
+ }
+
+ hidpp_populate_input(hidpp, input, false);
+
+ ret = input_register_device(input);
+ if (ret)
+ input_free_device(input);
+
+ hidpp->delayed_input = input;
+}
+
+static int hidpp_probe(struct hid_device *hdev, const struct hid_device_id *id)
+{
+ struct hidpp_device *hidpp;
+ int ret;
+ bool connected;
+ unsigned int connect_mask = HID_CONNECT_DEFAULT;
+
+ hidpp = devm_kzalloc(&hdev->dev, sizeof(struct hidpp_device),
+ GFP_KERNEL);
+ if (!hidpp)
+ return -ENOMEM;
+
+ hidpp->hid_dev = hdev;
+ hidpp->name = hdev->name;
+ hid_set_drvdata(hdev, hidpp);
+
+ hidpp->quirks = id->driver_data;
+
+ if (disable_raw_mode) {
+ hidpp->quirks &= ~HIDPP_QUIRK_CLASS_WTP;
+ hidpp->quirks &= ~HIDPP_QUIRK_DELAYED_INIT;
+ }
+
+ if (hidpp->quirks & HIDPP_QUIRK_CLASS_WTP) {
+ ret = wtp_allocate(hdev, id);
+ if (ret)
+ goto wtp_allocate_fail;
+ }
+
+ INIT_WORK(&hidpp->work, delayed_work_cb);
+ mutex_init(&hidpp->send_mutex);
+ init_waitqueue_head(&hidpp->wait);
+
+ ret = hid_parse(hdev);
+ if (ret) {
+ hid_err(hdev, "%s:parse failed\n", __func__);
+ goto hid_parse_fail;
+ }
+
+ /* Allow incoming packets */
+ hid_device_io_start(hdev);
+
+ connected = hidpp_is_connected(hidpp);
+ if (id->group != HID_GROUP_LOGITECH_DJ_DEVICE) {
+ if (!connected) {
+ ret = -ENODEV;
+ hid_err(hdev, "Device not connected");
+ hid_device_io_stop(hdev);
+ goto hid_parse_fail;
+ }
+
+ hid_info(hdev, "HID++ %u.%u device connected.\n",
+ hidpp->protocol_major, hidpp->protocol_minor);
+ }
+
+ hidpp_overwrite_name(hdev, id->group == HID_GROUP_LOGITECH_DJ_DEVICE);
+ atomic_set(&hidpp->connected, connected);
+
+ if (connected && (hidpp->quirks & HIDPP_QUIRK_CLASS_WTP)) {
+ ret = wtp_get_config(hidpp);
+ if (ret)
+ goto hid_parse_fail;
+ }
+
+ /* Block incoming packets */
+ hid_device_io_stop(hdev);
+
+ if (hidpp->quirks & HIDPP_QUIRK_DELAYED_INIT)
+ connect_mask &= ~HID_CONNECT_HIDINPUT;
+
+ ret = hid_hw_start(hdev, connect_mask);
+ if (ret) {
+ hid_err(hdev, "%s:hid_hw_start returned error\n", __func__);
+ goto hid_hw_start_fail;
+ }
+
+ if (hidpp->quirks & HIDPP_QUIRK_DELAYED_INIT) {
+ /* Allow incoming packets */
+ hid_device_io_start(hdev);
+
+ hidpp_connect_event(hidpp);
+ }
+
+ return ret;
+
+hid_hw_start_fail:
+hid_parse_fail:
+ cancel_work_sync(&hidpp->work);
+ mutex_destroy(&hidpp->send_mutex);
+wtp_allocate_fail:
+ hid_set_drvdata(hdev, NULL);
+ return ret;
+}
+
+static void hidpp_remove(struct hid_device *hdev)
+{
+ struct hidpp_device *hidpp = hid_get_drvdata(hdev);
+
+ cancel_work_sync(&hidpp->work);
+ mutex_destroy(&hidpp->send_mutex);
+ hid_hw_stop(hdev);
+}
+
+static const struct hid_device_id hidpp_devices[] = {
+ { /* wireless touchpad */
+ HID_DEVICE(BUS_USB, HID_GROUP_LOGITECH_DJ_DEVICE,
+ USB_VENDOR_ID_LOGITECH, 0x4011),
+ .driver_data = HIDPP_QUIRK_CLASS_WTP | HIDPP_QUIRK_DELAYED_INIT |
+ HIDPP_QUIRK_WTP_PHYSICAL_BUTTONS },
+ { /* wireless touchpad T650 */
+ HID_DEVICE(BUS_USB, HID_GROUP_LOGITECH_DJ_DEVICE,
+ USB_VENDOR_ID_LOGITECH, 0x4101),
+ .driver_data = HIDPP_QUIRK_CLASS_WTP | HIDPP_QUIRK_DELAYED_INIT },
+ { /* wireless touchpad T651 */
+ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_LOGITECH,
+ USB_DEVICE_ID_LOGITECH_T651),
+ .driver_data = HIDPP_QUIRK_CLASS_WTP },
+
+ { HID_DEVICE(BUS_USB, HID_GROUP_LOGITECH_DJ_DEVICE,
+ USB_VENDOR_ID_LOGITECH, HID_ANY_ID)},
+ {}
+};
+
+MODULE_DEVICE_TABLE(hid, hidpp_devices);
+
+static struct hid_driver hidpp_driver = {
+ .name = "logitech-hidpp-device",
+ .id_table = hidpp_devices,
+ .probe = hidpp_probe,
+ .remove = hidpp_remove,
+ .raw_event = hidpp_raw_event,
+ .input_configured = hidpp_input_configured,
+ .input_mapping = hidpp_input_mapping,
+};
+
+module_hid_driver(hidpp_driver);
Code Review / kvmfornfv.git / blobdiff