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hid-logitech-hidpp.c
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hid-logitech-hidpp.c
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// SPDX-License-Identifier: GPL-2.0-only
/*
* HIDPP protocol for Logitech receivers
*
* Copyright (c) 2011 Logitech (c)
* Copyright (c) 2012-2013 Google (c)
* Copyright (c) 2013-2014 Red Hat Inc.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/device.h>
#include <linux/input.h>
#include <linux/usb.h>
#include <linux/hid.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/sched/clock.h>
#include <linux/kfifo.h>
#include <linux/input/mt.h>
#include <linux/workqueue.h>
#include <linux/atomic.h>
#include <linux/fixp-arith.h>
#include <asm/unaligned.h>
#include "usbhid/usbhid.h"
#include "hid-ids.h"
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Benjamin Tissoires <[email protected]>");
MODULE_AUTHOR("Nestor Lopez Casado <[email protected]>");
MODULE_AUTHOR("Bastien Nocera <[email protected]>");
static bool disable_tap_to_click;
module_param(disable_tap_to_click, bool, 0644);
MODULE_PARM_DESC(disable_tap_to_click,
"Disable Tap-To-Click mode reporting for touchpads (only on the K400 currently).");
/* Define a non-zero software ID to identify our own requests */
#define LINUX_KERNEL_SW_ID 0x01
#define REPORT_ID_HIDPP_SHORT 0x10
#define REPORT_ID_HIDPP_LONG 0x11
#define REPORT_ID_HIDPP_VERY_LONG 0x12
#define HIDPP_REPORT_SHORT_LENGTH 7
#define HIDPP_REPORT_LONG_LENGTH 20
#define HIDPP_REPORT_VERY_LONG_MAX_LENGTH 64
#define HIDPP_REPORT_SHORT_SUPPORTED BIT(0)
#define HIDPP_REPORT_LONG_SUPPORTED BIT(1)
#define HIDPP_REPORT_VERY_LONG_SUPPORTED BIT(2)
#define HIDPP_SUB_ID_CONSUMER_VENDOR_KEYS 0x03
#define HIDPP_SUB_ID_ROLLER 0x05
#define HIDPP_SUB_ID_MOUSE_EXTRA_BTNS 0x06
#define HIDPP_SUB_ID_USER_IFACE_EVENT 0x08
#define HIDPP_USER_IFACE_EVENT_ENCRYPTION_KEY_LOST BIT(5)
#define HIDPP_QUIRK_CLASS_WTP BIT(0)
#define HIDPP_QUIRK_CLASS_M560 BIT(1)
#define HIDPP_QUIRK_CLASS_K400 BIT(2)
#define HIDPP_QUIRK_CLASS_G920 BIT(3)
#define HIDPP_QUIRK_CLASS_K750 BIT(4)
/* bits 2..20 are reserved for classes */
/* #define HIDPP_QUIRK_CONNECT_EVENTS BIT(21) disabled */
#define HIDPP_QUIRK_WTP_PHYSICAL_BUTTONS BIT(22)
#define HIDPP_QUIRK_DELAYED_INIT BIT(23)
#define HIDPP_QUIRK_FORCE_OUTPUT_REPORTS BIT(24)
#define HIDPP_QUIRK_UNIFYING BIT(25)
#define HIDPP_QUIRK_HIDPP_WHEELS BIT(26)
#define HIDPP_QUIRK_HIDPP_EXTRA_MOUSE_BTNS BIT(27)
#define HIDPP_QUIRK_HIDPP_CONSUMER_VENDOR_KEYS BIT(28)
#define HIDPP_QUIRK_HI_RES_SCROLL_1P0 BIT(29)
#define HIDPP_QUIRK_WIRELESS_STATUS BIT(30)
/* These are just aliases for now */
#define HIDPP_QUIRK_KBD_SCROLL_WHEEL HIDPP_QUIRK_HIDPP_WHEELS
#define HIDPP_QUIRK_KBD_ZOOM_WHEEL HIDPP_QUIRK_HIDPP_WHEELS
/* Convenience constant to check for any high-res support. */
#define HIDPP_CAPABILITY_HI_RES_SCROLL (HIDPP_CAPABILITY_HIDPP10_FAST_SCROLL | \
HIDPP_CAPABILITY_HIDPP20_HI_RES_SCROLL | \
HIDPP_CAPABILITY_HIDPP20_HI_RES_WHEEL)
#define HIDPP_CAPABILITY_HIDPP10_BATTERY BIT(0)
#define HIDPP_CAPABILITY_HIDPP20_BATTERY BIT(1)
#define HIDPP_CAPABILITY_BATTERY_MILEAGE BIT(2)
#define HIDPP_CAPABILITY_BATTERY_LEVEL_STATUS BIT(3)
#define HIDPP_CAPABILITY_BATTERY_VOLTAGE BIT(4)
#define HIDPP_CAPABILITY_BATTERY_PERCENTAGE BIT(5)
#define HIDPP_CAPABILITY_UNIFIED_BATTERY BIT(6)
#define HIDPP_CAPABILITY_HIDPP20_HI_RES_WHEEL BIT(7)
#define HIDPP_CAPABILITY_HIDPP20_HI_RES_SCROLL BIT(8)
#define HIDPP_CAPABILITY_HIDPP10_FAST_SCROLL BIT(9)
#define HIDPP_CAPABILITY_ADC_MEASUREMENT BIT(10)
#define lg_map_key_clear(c) hid_map_usage_clear(hi, usage, bit, max, EV_KEY, (c))
/*
* 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_VERY_LONG_MAX_LENGTH - 4U];
};
struct rap {
u8 sub_id;
u8 reg_address;
u8 params[HIDPP_REPORT_VERY_LONG_MAX_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_battery {
u8 feature_index;
u8 solar_feature_index;
u8 voltage_feature_index;
u8 adc_measurement_feature_index;
struct power_supply_desc desc;
struct power_supply *ps;
char name[64];
int status;
int capacity;
int level;
int voltage;
int charge_type;
bool online;
u8 supported_levels_1004;
};
/**
* struct hidpp_scroll_counter - Utility class for processing high-resolution
* scroll events.
* @dev: the input device for which events should be reported.
* @wheel_multiplier: the scalar multiplier to be applied to each wheel event
* @remainder: counts the number of high-resolution units moved since the last
* low-resolution event (REL_WHEEL or REL_HWHEEL) was sent. Should
* only be used by class methods.
* @direction: direction of last movement (1 or -1)
* @last_time: last event time, used to reset remainder after inactivity
*/
struct hidpp_scroll_counter {
int wheel_multiplier;
int remainder;
int direction;
unsigned long long last_time;
};
struct hidpp_device {
struct hid_device *hid_dev;
struct input_dev *input;
struct mutex send_mutex;
void *send_receive_buf;
char *name; /* will never be NULL and should not be freed */
wait_queue_head_t wait;
int very_long_report_length;
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;
unsigned long capabilities;
u8 supported_reports;
struct hidpp_battery battery;
struct hidpp_scroll_counter vertical_wheel_counter;
u8 wireless_feature_index;
};
/* 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_NO_ERROR 0x00
#define HIDPP20_ERROR_UNKNOWN 0x01
#define HIDPP20_ERROR_INVALID_ARGS 0x02
#define HIDPP20_ERROR_OUT_OF_RANGE 0x03
#define HIDPP20_ERROR_HW_ERROR 0x04
#define HIDPP20_ERROR_LOGITECH_INTERNAL 0x05
#define HIDPP20_ERROR_INVALID_FEATURE_INDEX 0x06
#define HIDPP20_ERROR_INVALID_FUNCTION_ID 0x07
#define HIDPP20_ERROR_BUSY 0x08
#define HIDPP20_ERROR_UNSUPPORTED 0x09
#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)
{
struct hidpp_device *hidpp = hid_get_drvdata(hdev);
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;
case REPORT_ID_HIDPP_VERY_LONG:
fields_count = hidpp->very_long_report_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;
if (hidpp->quirks & HIDPP_QUIRK_FORCE_OUTPUT_REPORTS) {
ret = hid_hw_output_report(hdev, (u8 *)hidpp_report, fields_count);
} else {
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 = -1;
int max_retries = 3;
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;
for (; max_retries != 0 && ret; max_retries--) {
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));
break;
}
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;
break;
}
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);
break;
}
if ((response->report_id == REPORT_ID_HIDPP_LONG ||
response->report_id == REPORT_ID_HIDPP_VERY_LONG) &&
response->fap.feature_index == HIDPP20_ERROR) {
ret = response->fap.params[1];
if (ret != HIDPP20_ERROR_BUSY) {
dbg_hid("%s:got hidpp 2.0 error %02X\n", __func__, ret);
break;
}
dbg_hid("%s:got busy hidpp 2.0 error %02X, retrying\n", __func__, ret);
}
}
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)) {
hid_dbg(hidpp->hid_dev,
"Invalid number of parameters passed to command (%d != %llu)\n",
param_count,
(unsigned long long) sizeof(message->fap.params));
return -EINVAL;
}
message = kzalloc(sizeof(struct hidpp_report), GFP_KERNEL);
if (!message)
return -ENOMEM;
if (param_count > (HIDPP_REPORT_LONG_LENGTH - 4))
message->report_id = REPORT_ID_HIDPP_VERY_LONG;
else
message->report_id = REPORT_ID_HIDPP_LONG;
message->fap.feature_index = feat_index;
message->fap.funcindex_clientid = funcindex_clientid | LINUX_KERNEL_SW_ID;
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, max_count;
/* Send as long report if short reports are not supported. */
if (report_id == REPORT_ID_HIDPP_SHORT &&
!(hidpp_dev->supported_reports & HIDPP_REPORT_SHORT_SUPPORTED))
report_id = REPORT_ID_HIDPP_LONG;
switch (report_id) {
case REPORT_ID_HIDPP_SHORT:
max_count = HIDPP_REPORT_SHORT_LENGTH - 4;
break;
case REPORT_ID_HIDPP_LONG:
max_count = HIDPP_REPORT_LONG_LENGTH - 4;
break;
case REPORT_ID_HIDPP_VERY_LONG:
max_count = hidpp_dev->very_long_report_length - 4;
break;
default:
return -EINVAL;
}
if (param_count > max_count)
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_device *hidpp,
struct hidpp_report *report)
{
return (hidpp->wireless_feature_index &&
(report->fap.feature_index == hidpp->wireless_feature_index)) ||
((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;
}
/*
* Updates the USB wireless_status based on whether the headset
* is turned on and reachable.
*/
static void hidpp_update_usb_wireless_status(struct hidpp_device *hidpp)
{
struct hid_device *hdev = hidpp->hid_dev;
struct usb_interface *intf;
if (!(hidpp->quirks & HIDPP_QUIRK_WIRELESS_STATUS))
return;
if (!hid_is_usb(hdev))
return;
intf = to_usb_interface(hdev->dev.parent);
usb_set_wireless_status(intf, hidpp->battery.online ?
USB_WIRELESS_STATUS_CONNECTED :
USB_WIRELESS_STATUS_DISCONNECTED);
}
/**
* hidpp_scroll_counter_handle_scroll() - Send high- and low-resolution scroll
* events given a high-resolution wheel
* movement.
* @input_dev: Pointer to the input device
* @counter: a hid_scroll_counter struct describing the wheel.
* @hi_res_value: the movement of the wheel, in the mouse's high-resolution
* units.
*
* Given a high-resolution movement, this function converts the movement into
* fractions of 120 and emits high-resolution scroll events for the input
* device. It also uses the multiplier from &struct hid_scroll_counter to
* emit low-resolution scroll events when appropriate for
* backwards-compatibility with userspace input libraries.
*/
static void hidpp_scroll_counter_handle_scroll(struct input_dev *input_dev,
struct hidpp_scroll_counter *counter,
int hi_res_value)
{
int low_res_value, remainder, direction;
unsigned long long now, previous;
hi_res_value = hi_res_value * 120/counter->wheel_multiplier;
input_report_rel(input_dev, REL_WHEEL_HI_RES, hi_res_value);
remainder = counter->remainder;
direction = hi_res_value > 0 ? 1 : -1;
now = sched_clock();
previous = counter->last_time;
counter->last_time = now;
/*
* Reset the remainder after a period of inactivity or when the
* direction changes. This prevents the REL_WHEEL emulation point
* from sliding for devices that don't always provide the same
* number of movements per detent.
*/
if (now - previous > 1000000000 || direction != counter->direction)
remainder = 0;
counter->direction = direction;
remainder += hi_res_value;
/* Some wheels will rest 7/8ths of a detent from the previous detent
* after slow movement, so we want the threshold for low-res events to
* be in the middle between two detents (e.g. after 4/8ths) as
* opposed to on the detents themselves (8/8ths).
*/
if (abs(remainder) >= 60) {
/* Add (or subtract) 1 because we want to trigger when the wheel
* is half-way to the next detent (i.e. scroll 1 detent after a
* 1/2 detent movement, 2 detents after a 1 1/2 detent movement,
* etc.).
*/
low_res_value = remainder / 120;
if (low_res_value == 0)
low_res_value = (hi_res_value > 0 ? 1 : -1);
input_report_rel(input_dev, REL_WHEEL, low_res_value);
remainder -= low_res_value * 120;
}
counter->remainder = remainder;
}
/* -------------------------------------------------------------------------- */
/* 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
/**
* hidpp10_set_register - Modify a HID++ 1.0 register.
* @hidpp_dev: the device to set the register on.
* @register_address: the address of the register to modify.
* @byte: the byte of the register to modify. Should be less than 3.
* @mask: mask of the bits to modify
* @value: new values for the bits in mask
* Return: 0 if successful, otherwise a negative error code.
*/
static int hidpp10_set_register(struct hidpp_device *hidpp_dev,
u8 register_address, u8 byte, u8 mask, u8 value)
{
struct hidpp_report response;
int ret;
u8 params[3] = { 0 };
ret = hidpp_send_rap_command_sync(hidpp_dev,
REPORT_ID_HIDPP_SHORT,
HIDPP_GET_REGISTER,
register_address,
NULL, 0, &response);
if (ret)
return ret;
memcpy(params, response.rap.params, 3);
params[byte] &= ~mask;
params[byte] |= value & mask;
return hidpp_send_rap_command_sync(hidpp_dev,
REPORT_ID_HIDPP_SHORT,
HIDPP_SET_REGISTER,
register_address,
params, 3, &response);
}
#define HIDPP_REG_ENABLE_REPORTS 0x00
#define HIDPP_ENABLE_CONSUMER_REPORT BIT(0)
#define HIDPP_ENABLE_WHEEL_REPORT BIT(2)
#define HIDPP_ENABLE_MOUSE_EXTRA_BTN_REPORT BIT(3)
#define HIDPP_ENABLE_BAT_REPORT BIT(4)
#define HIDPP_ENABLE_HWHEEL_REPORT BIT(5)
static int hidpp10_enable_battery_reporting(struct hidpp_device *hidpp_dev)
{
return hidpp10_set_register(hidpp_dev, HIDPP_REG_ENABLE_REPORTS, 0,
HIDPP_ENABLE_BAT_REPORT, HIDPP_ENABLE_BAT_REPORT);
}
#define HIDPP_REG_FEATURES 0x01
#define HIDPP_ENABLE_SPECIAL_BUTTON_FUNC BIT(1)
#define HIDPP_ENABLE_FAST_SCROLL BIT(6)
/* On HID++ 1.0 devices, high-res scroll was called "scrolling acceleration". */
static int hidpp10_enable_scrolling_acceleration(struct hidpp_device *hidpp_dev)
{
return hidpp10_set_register(hidpp_dev, HIDPP_REG_FEATURES, 0,
HIDPP_ENABLE_FAST_SCROLL, HIDPP_ENABLE_FAST_SCROLL);
}
#define HIDPP_REG_BATTERY_STATUS 0x07
static int hidpp10_battery_status_map_level(u8 param)
{
int level;
switch (param) {
case 1 ... 2:
level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
break;
case 3 ... 4:
level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
break;
case 5 ... 6:
level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
break;
case 7:
level = POWER_SUPPLY_CAPACITY_LEVEL_HIGH;
break;
default:
level = POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN;
}
return level;
}
static int hidpp10_battery_status_map_status(u8 param)
{
int status;
switch (param) {
case 0x00:
/* discharging (in use) */
status = POWER_SUPPLY_STATUS_DISCHARGING;
break;
case 0x21: /* (standard) charging */
case 0x24: /* fast charging */
case 0x25: /* slow charging */
status = POWER_SUPPLY_STATUS_CHARGING;
break;
case 0x26: /* topping charge */
case 0x22: /* charge complete */
status = POWER_SUPPLY_STATUS_FULL;
break;
case 0x20: /* unknown */
status = POWER_SUPPLY_STATUS_UNKNOWN;
break;
/*
* 0x01...0x1F = reserved (not charging)
* 0x23 = charging error
* 0x27..0xff = reserved
*/
default:
status = POWER_SUPPLY_STATUS_NOT_CHARGING;
break;
}
return status;
}
static int hidpp10_query_battery_status(struct hidpp_device *hidpp)
{
struct hidpp_report response;
int ret, status;
ret = hidpp_send_rap_command_sync(hidpp,
REPORT_ID_HIDPP_SHORT,
HIDPP_GET_REGISTER,
HIDPP_REG_BATTERY_STATUS,
NULL, 0, &response);
if (ret)
return ret;
hidpp->battery.level =
hidpp10_battery_status_map_level(response.rap.params[0]);
status = hidpp10_battery_status_map_status(response.rap.params[1]);
hidpp->battery.status = status;
/* the capacity is only available when discharging or full */
hidpp->battery.online = status == POWER_SUPPLY_STATUS_DISCHARGING ||
status == POWER_SUPPLY_STATUS_FULL;
return 0;
}
#define HIDPP_REG_BATTERY_MILEAGE 0x0D
static int hidpp10_battery_mileage_map_status(u8 param)
{
int status;
switch (param >> 6) {
case 0x00:
/* discharging (in use) */
status = POWER_SUPPLY_STATUS_DISCHARGING;
break;
case 0x01: /* charging */
status = POWER_SUPPLY_STATUS_CHARGING;
break;
case 0x02: /* charge complete */
status = POWER_SUPPLY_STATUS_FULL;
break;
/*
* 0x03 = charging error
*/
default:
status = POWER_SUPPLY_STATUS_NOT_CHARGING;
break;
}
return status;
}
static int hidpp10_query_battery_mileage(struct hidpp_device *hidpp)
{
struct hidpp_report response;
int ret, status;
ret = hidpp_send_rap_command_sync(hidpp,
REPORT_ID_HIDPP_SHORT,
HIDPP_GET_REGISTER,
HIDPP_REG_BATTERY_MILEAGE,
NULL, 0, &response);
if (ret)
return ret;
hidpp->battery.capacity = response.rap.params[0];
status = hidpp10_battery_mileage_map_status(response.rap.params[2]);
hidpp->battery.status = status;
/* the capacity is only available when discharging or full */
hidpp->battery.online = status == POWER_SUPPLY_STATUS_DISCHARGING ||
status == POWER_SUPPLY_STATUS_FULL;
return 0;
}
static int hidpp10_battery_event(struct hidpp_device *hidpp, u8 *data, int size)
{
struct hidpp_report *report = (struct hidpp_report *)data;
int status, capacity, level;
bool changed;
if (report->report_id != REPORT_ID_HIDPP_SHORT)
return 0;
switch (report->rap.sub_id) {
case HIDPP_REG_BATTERY_STATUS:
capacity = hidpp->battery.capacity;
level = hidpp10_battery_status_map_level(report->rawbytes[1]);
status = hidpp10_battery_status_map_status(report->rawbytes[2]);
break;
case HIDPP_REG_BATTERY_MILEAGE:
capacity = report->rap.params[0];
level = hidpp->battery.level;
status = hidpp10_battery_mileage_map_status(report->rawbytes[3]);
break;
default:
return 0;
}
changed = capacity != hidpp->battery.capacity ||
level != hidpp->battery.level ||
status != hidpp->battery.status;
/* the capacity is only available when discharging or full */
hidpp->battery.online = status == POWER_SUPPLY_STATUS_DISCHARGING ||
status == POWER_SUPPLY_STATUS_FULL;
if (changed) {
hidpp->battery.level = level;
hidpp->battery.status = status;
if (hidpp->battery.ps)
power_supply_changed(hidpp->battery.ps);
}
return 0;
}
#define HIDPP_REG_PAIRING_INFORMATION 0xB5
#define HIDPP_EXTENDED_PAIRING 0x30
#define HIDPP_DEVICE_NAME 0x40
static char *hidpp_unifying_get_name(struct hidpp_device *hidpp_dev)
{
struct hidpp_report response;
int ret;
u8 params[1] = { HIDPP_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;
if (len < 4) /* logitech devices are usually at least Xddd */
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;
}
static int hidpp_unifying_get_serial(struct hidpp_device *hidpp, u32 *serial)
{
struct hidpp_report response;
int ret;
u8 params[1] = { HIDPP_EXTENDED_PAIRING };
ret = hidpp_send_rap_command_sync(hidpp,
REPORT_ID_HIDPP_SHORT,
HIDPP_GET_LONG_REGISTER,
HIDPP_REG_PAIRING_INFORMATION,
params, 1, &response);
if (ret)
return ret;
/*
* We don't care about LE or BE, we will output it as a string
* with %4phD, so we need to keep the order.
*/
*serial = *((u32 *)&response.rap.params[1]);
return 0;
}
static int hidpp_unifying_init(struct hidpp_device *hidpp)
{
struct hid_device *hdev = hidpp->hid_dev;
const char *name;
u32 serial;
int ret;
ret = hidpp_unifying_get_serial(hidpp, &serial);
if (ret)
return ret;
snprintf(hdev->uniq, sizeof(hdev->uniq), "%4phD", &serial);
dbg_hid("HID++ Unifying: Got serial: %s\n", hdev->uniq);
name = hidpp_unifying_get_name(hidpp);
if (!name)
return -EIO;
snprintf(hdev->name, sizeof(hdev->name), "%s", name);
dbg_hid("HID++ Unifying: Got name: %s\n", name);
kfree(name);
return 0;
}
/* -------------------------------------------------------------------------- */
/* 0x0000: Root */
/* -------------------------------------------------------------------------- */
#define HIDPP_PAGE_ROOT 0x0000
#define HIDPP_PAGE_ROOT_IDX 0x00
#define CMD_ROOT_GET_FEATURE 0x00
#define CMD_ROOT_GET_PROTOCOL_VERSION 0x10
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;
if (response.fap.params[0] == 0)
return -ENOENT;
*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)
{
const u8 ping_byte = 0x5a;
u8 ping_data[3] = { 0, 0, ping_byte };
struct hidpp_report response;
int ret;
ret = hidpp_send_rap_command_sync(hidpp,
REPORT_ID_HIDPP_SHORT,
HIDPP_PAGE_ROOT_IDX,
CMD_ROOT_GET_PROTOCOL_VERSION | LINUX_KERNEL_SW_ID,
ping_data, sizeof(ping_data), &response);
if (ret == HIDPP_ERROR_INVALID_SUBID) {
hidpp->protocol_major = 1;
hidpp->protocol_minor = 0;
goto print_version;
}
/* 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;
if (response.rap.params[2] != ping_byte) {
hid_err(hidpp->hid_dev, "%s: ping mismatch 0x%02x != 0x%02x\n",
__func__, response.rap.params[2], ping_byte);
return -EPROTO;
}
hidpp->protocol_major = response.rap.params[0];
hidpp->protocol_minor = response.rap.params[1];
print_version:
hid_info(hidpp->hid_dev, "HID++ %u.%u device connected.\n",
hidpp->protocol_major, hidpp->protocol_minor);
return 0;
}
/* -------------------------------------------------------------------------- */
/* 0x0003: Device Information */
/* -------------------------------------------------------------------------- */
#define HIDPP_PAGE_DEVICE_INFORMATION 0x0003
#define CMD_GET_DEVICE_INFO 0x00
static int hidpp_get_serial(struct hidpp_device *hidpp, u32 *serial)
{
struct hidpp_report response;
u8 feature_type;
u8 feature_index;
int ret;
ret = hidpp_root_get_feature(hidpp, HIDPP_PAGE_DEVICE_INFORMATION,
&feature_index,
&feature_type);
if (ret)
return ret;
ret = hidpp_send_fap_command_sync(hidpp, feature_index,
CMD_GET_DEVICE_INFO,
NULL, 0, &response);
if (ret)
return ret;
/* See hidpp_unifying_get_serial() */
*serial = *((u32 *)&response.rap.params[1]);