hid-logitech-hidpp.c 105 KB
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// SPDX-License-Identifier: GPL-2.0-only
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/*
 *  HIDPP protocol for Logitech Unifying 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>
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#include <linux/input.h>
#include <linux/usb.h>
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#include <linux/hid.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/sched.h>
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#include <linux/sched/clock.h>
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#include <linux/kfifo.h>
#include <linux/input/mt.h>
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#include <linux/workqueue.h>
#include <linux/atomic.h>
#include <linux/fixp-arith.h>
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#include <asm/unaligned.h>
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#include "usbhid/usbhid.h"
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#include "hid-ids.h"

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
MODULE_AUTHOR("Nestor Lopez Casado <nlopezcasad@logitech.com>");

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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.");

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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).");

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#define REPORT_ID_HIDPP_SHORT			0x10
#define REPORT_ID_HIDPP_LONG			0x11
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#define REPORT_ID_HIDPP_VERY_LONG		0x12
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#define HIDPP_REPORT_SHORT_LENGTH		7
#define HIDPP_REPORT_LONG_LENGTH		20
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#define HIDPP_REPORT_VERY_LONG_MAX_LENGTH	64
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#define HIDPP_SUB_ID_CONSUMER_VENDOR_KEYS	0x03
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#define HIDPP_SUB_ID_ROLLER			0x05
#define HIDPP_SUB_ID_MOUSE_EXTRA_BTNS		0x06

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#define HIDPP_QUIRK_CLASS_WTP			BIT(0)
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#define HIDPP_QUIRK_CLASS_M560			BIT(1)
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#define HIDPP_QUIRK_CLASS_K400			BIT(2)
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#define HIDPP_QUIRK_CLASS_G920			BIT(3)
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#define HIDPP_QUIRK_CLASS_K750			BIT(4)
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/* bits 2..20 are reserved for classes */
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/* #define HIDPP_QUIRK_CONNECT_EVENTS		BIT(21) disabled */
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#define HIDPP_QUIRK_WTP_PHYSICAL_BUTTONS	BIT(22)
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#define HIDPP_QUIRK_NO_HIDINPUT			BIT(23)
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#define HIDPP_QUIRK_FORCE_OUTPUT_REPORTS	BIT(24)
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#define HIDPP_QUIRK_UNIFYING			BIT(25)
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#define HIDPP_QUIRK_HI_RES_SCROLL_1P0		BIT(26)
#define HIDPP_QUIRK_HI_RES_SCROLL_X2120		BIT(27)
#define HIDPP_QUIRK_HI_RES_SCROLL_X2121		BIT(28)
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#define HIDPP_QUIRK_HIDPP_WHEELS		BIT(29)
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#define HIDPP_QUIRK_HIDPP_EXTRA_MOUSE_BTNS	BIT(30)
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#define HIDPP_QUIRK_HIDPP_CONSUMER_VENDOR_KEYS	BIT(31)
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/* 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
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/* Convenience constant to check for any high-res support. */
#define HIDPP_QUIRK_HI_RES_SCROLL	(HIDPP_QUIRK_HI_RES_SCROLL_1P0 | \
					 HIDPP_QUIRK_HI_RES_SCROLL_X2120 | \
					 HIDPP_QUIRK_HI_RES_SCROLL_X2121)
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#define HIDPP_QUIRK_DELAYED_INIT		HIDPP_QUIRK_NO_HIDINPUT
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#define HIDPP_CAPABILITY_HIDPP10_BATTERY	BIT(0)
#define HIDPP_CAPABILITY_HIDPP20_BATTERY	BIT(1)
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#define HIDPP_CAPABILITY_BATTERY_MILEAGE	BIT(2)
#define HIDPP_CAPABILITY_BATTERY_LEVEL_STATUS	BIT(3)
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/*
 * 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;
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	u8 params[HIDPP_REPORT_VERY_LONG_MAX_LENGTH - 4U];
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};

struct rap {
	u8 sub_id;
	u8 reg_address;
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	u8 params[HIDPP_REPORT_VERY_LONG_MAX_LENGTH - 4U];
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};

struct hidpp_report {
	u8 report_id;
	u8 device_index;
	union {
		struct fap fap;
		struct rap rap;
		u8 rawbytes[sizeof(struct fap)];
	};
} __packed;

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struct hidpp_battery {
	u8 feature_index;
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	u8 solar_feature_index;
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	struct power_supply_desc desc;
	struct power_supply *ps;
	char name[64];
	int status;
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	int capacity;
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	int level;
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	bool online;
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};

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/**
 * 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;
};

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struct hidpp_device {
	struct hid_device *hid_dev;
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	struct input_dev *input;
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	struct mutex send_mutex;
	void *send_receive_buf;
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	char *name;		/* will never be NULL and should not be freed */
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	wait_queue_head_t wait;
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	int very_long_report_length;
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	bool answer_available;
	u8 protocol_major;
	u8 protocol_minor;

	void *private_data;

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	struct work_struct work;
	struct kfifo delayed_work_fifo;
	atomic_t connected;
	struct input_dev *delayed_input;

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	unsigned long quirks;
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	unsigned long capabilities;
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	struct hidpp_battery battery;
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	struct hidpp_scroll_counter vertical_wheel_counter;
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};
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/* HID++ 1.0 error codes */
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#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
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/* HID++ 2.0 error codes */
#define HIDPP20_ERROR				0xff
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static void hidpp_connect_event(struct hidpp_device *hidpp_dev);

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static int __hidpp_send_report(struct hid_device *hdev,
				struct hidpp_report *hidpp_report)
{
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	struct hidpp_device *hidpp = hid_get_drvdata(hdev);
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	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;
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	case REPORT_ID_HIDPP_VERY_LONG:
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		fields_count = hidpp->very_long_report_length;
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		break;
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	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;

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	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);
	}
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	return ret == fields_count ? 0 : -1;
}

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/**
 * 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...)
 */
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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 &&
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	    response->rap.sub_id == HIDPP_ERROR) {
		ret = response->rap.params[1];
		dbg_hid("%s:got hidpp error %02X\n", __func__, ret);
		goto exit;
	}

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	if ((response->report_id == REPORT_ID_HIDPP_LONG ||
			response->report_id == REPORT_ID_HIDPP_VERY_LONG) &&
			response->fap.feature_index == HIDPP20_ERROR) {
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		ret = response->fap.params[1];
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		dbg_hid("%s:got hidpp 2.0 error %02X\n", __func__, ret);
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		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)
{
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	struct hidpp_report *message;
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	int ret;

	if (param_count > sizeof(message->fap.params))
		return -EINVAL;

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	message = kzalloc(sizeof(struct hidpp_report), GFP_KERNEL);
	if (!message)
		return -ENOMEM;
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	if (param_count > (HIDPP_REPORT_LONG_LENGTH - 4))
		message->report_id = REPORT_ID_HIDPP_VERY_LONG;
	else
		message->report_id = REPORT_ID_HIDPP_LONG;
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	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;
}

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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)
{
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	struct hidpp_report *message;
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	int ret, max_count;
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	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:
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		max_count = hidpp_dev->very_long_report_length - 4;
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		break;
	default:
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		return -EINVAL;
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	}
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	if (param_count > max_count)
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		return -EINVAL;

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	message = kzalloc(sizeof(struct hidpp_report), GFP_KERNEL);
	if (!message)
		return -ENOMEM;
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	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;
}

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static void delayed_work_cb(struct work_struct *work)
{
	struct hidpp_device *hidpp = container_of(work, struct hidpp_device,
							work);
	hidpp_connect_event(hidpp);
}

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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)
{
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	return ((answer->rap.sub_id == HIDPP_ERROR) ||
	    (answer->fap.feature_index == HIDPP20_ERROR)) &&
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	    (answer->fap.funcindex_clientid == question->fap.feature_index) &&
	    (answer->fap.params[0] == question->fap.funcindex_clientid);
}

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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);
}

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/**
 * 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;
}

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/**
 * hidpp_scroll_counter_handle_scroll() - Send high- and low-resolution scroll
 *                                        events given a high-resolution wheel
 *                                        movement.
 * @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.
 */
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static void hidpp_scroll_counter_handle_scroll(struct input_dev *input_dev,
					       struct hidpp_scroll_counter *counter,
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					       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;
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	input_report_rel(input_dev, REL_WHEEL_HI_RES, hi_res_value);
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	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);
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		input_report_rel(input_dev, REL_WHEEL, low_res_value);
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		remainder -= low_res_value * 120;
	}
	counter->remainder = remainder;
}

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/* -------------------------------------------------------------------------- */
/* 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

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/**
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 * hidpp10_set_register - Modify a HID++ 1.0 register.
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 * @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.
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 * @mask: mask of the bits to modify
 * @value: new values for the bits in mask
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 * Return: 0 if successful, otherwise a negative error code.
 */
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static int hidpp10_set_register(struct hidpp_device *hidpp_dev,
	u8 register_address, u8 byte, u8 mask, u8 value)
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{
	struct hidpp_report response;
	int ret;
	u8 params[3] = { 0 };

	ret = hidpp_send_rap_command_sync(hidpp_dev,
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					  REPORT_ID_HIDPP_SHORT,
					  HIDPP_GET_REGISTER,
					  register_address,
					  NULL, 0, &response);
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	if (ret)
		return ret;

	memcpy(params, response.rap.params, 3);

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	params[byte] &= ~mask;
	params[byte] |= value & mask;
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	return hidpp_send_rap_command_sync(hidpp_dev,
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					   REPORT_ID_HIDPP_SHORT,
					   HIDPP_SET_REGISTER,
					   register_address,
					   params, 3, &response);
}

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#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)
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static int hidpp10_enable_battery_reporting(struct hidpp_device *hidpp_dev)
{
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	return hidpp10_set_register(hidpp_dev, HIDPP_REG_ENABLE_REPORTS, 0,
			  HIDPP_ENABLE_BAT_REPORT, HIDPP_ENABLE_BAT_REPORT);
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}

#define HIDPP_REG_FEATURES				0x01
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#define HIDPP_ENABLE_SPECIAL_BUTTON_FUNC		BIT(1)
#define HIDPP_ENABLE_FAST_SCROLL			BIT(6)
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/* On HID++ 1.0 devices, high-res scroll was called "scrolling acceleration". */
static int hidpp10_enable_scrolling_acceleration(struct hidpp_device *hidpp_dev)
{
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	return hidpp10_set_register(hidpp_dev, HIDPP_REG_FEATURES, 0,
			  HIDPP_ENABLE_FAST_SCROLL, HIDPP_ENABLE_FAST_SCROLL);
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}

#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;
}

737
#define HIDPP_REG_PAIRING_INFORMATION			0xB5
738 739
#define HIDPP_EXTENDED_PAIRING				0x30
#define HIDPP_DEVICE_NAME				0x40
740

741
static char *hidpp_unifying_get_name(struct hidpp_device *hidpp_dev)
742 743 744
{
	struct hidpp_report response;
	int ret;
745
	u8 params[1] = { HIDPP_DEVICE_NAME };
746 747 748 749 750 751 752 753 754 755 756 757 758
	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];

759 760 761
	if (2 + len > sizeof(response.rap.params))
		return NULL;

762 763 764
	if (len < 4) /* logitech devices are usually at least Xddd */
		return NULL;

765 766 767 768 769
	name = kzalloc(len + 1, GFP_KERNEL);
	if (!name)
		return NULL;

	memcpy(name, &response.rap.params[2], len);
770 771 772 773

	/* include the terminating '\0' */
	hidpp_prefix_name(&name, len + 1);

774 775 776
	return name;
}

777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824
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), "%04x-%4phD",
		 hdev->product, &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;
}

825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848
/* -------------------------------------------------------------------------- */
/* 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;

849 850 851
	if (response.fap.params[0] == 0)
		return -ENOENT;

852 853 854 855 856 857 858 859
	*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)
{
860 861
	const u8 ping_byte = 0x5a;
	u8 ping_data[3] = { 0, 0, ping_byte };
862 863 864
	struct hidpp_report response;
	int ret;

865 866
	ret = hidpp_send_rap_command_sync(hidpp,
			REPORT_ID_HIDPP_SHORT,
867 868
			HIDPP_PAGE_ROOT_IDX,
			CMD_ROOT_GET_PROTOCOL_VERSION,
869
			ping_data, sizeof(ping_data), &response);
870

871
	if (ret == HIDPP_ERROR_INVALID_SUBID) {
872 873
		hidpp->protocol_major = 1;
		hidpp->protocol_minor = 0;
874
		goto print_version;
875 876
	}

877 878 879 880
	/* the device might not be connected */
	if (ret == HIDPP_ERROR_RESOURCE_ERROR)
		return -EIO;

881 882 883 884 885
	if (ret > 0) {
		hid_err(hidpp->hid_dev, "%s: received protocol error 0x%02x\n",
			__func__, ret);
		return -EPROTO;
	}
886
	if (ret)
887
		return ret;
888

889 890 891 892 893 894 895 896
	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];
897

898 899 900 901
print_version:
	hid_info(hidpp->hid_dev, "HID++ %u.%u device connected.\n",
		 hidpp->protocol_major, hidpp->protocol_minor);
	return 0;
902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922
}

/* -------------------------------------------------------------------------- */
/* 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);

923 924 925 926 927
	if (ret > 0) {
		hid_err(hidpp->hid_dev, "%s: received protocol error 0x%02x\n",
			__func__, ret);
		return -EPROTO;
	}
928
	if (ret)
929
		return ret;
930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946

	*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);

947 948 949 950 951
	if (ret > 0) {
		hid_err(hidpp->hid_dev, "%s: received protocol error 0x%02x\n",
			__func__, ret);
		return -EPROTO;
	}
952
	if (ret)
953
		return ret;
954

955 956
	switch (response.report_id) {
	case REPORT_ID_HIDPP_VERY_LONG:
957
		count = hidpp->very_long_report_length - 4;
958 959
		break;
	case REPORT_ID_HIDPP_LONG:
960
		count = HIDPP_REPORT_LONG_LENGTH - 4;
961 962
		break;
	case REPORT_ID_HIDPP_SHORT:
963
		count = HIDPP_REPORT_SHORT_LENGTH - 4;
964 965 966 967
		break;
	default:
		return -EPROTO;
	}
968 969 970 971 972 973 974 975 976 977

	if (len_buf < count)
		count = len_buf;

	for (i = 0; i < count; i++)
		device_name[i] = response.fap.params[i];

	return count;
}

978
static char *hidpp_get_device_name(struct hidpp_device *hidpp)
979 980 981 982 983 984 985 986 987 988 989
{
	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)
990
		return NULL;
991 992 993 994

	ret = hidpp_devicenametype_get_count(hidpp, feature_index,
		&__name_length);
	if (ret)
995
		return NULL;
996 997 998

	name = kzalloc(__name_length + 1, GFP_KERNEL);
	if (!name)
999
		return NULL;
1000

1001 1002
	while (index < __name_length) {
		ret = hidpp_devicenametype_get_device_name(hidpp,
1003 1004
			feature_index, index, name + index,
			__name_length - index);
1005 1006 1007 1008 1009 1010
		if (ret <= 0) {
			kfree(name);
			return NULL;
		}
		index += ret;
	}
1011

1012 1013 1014
	/* include the terminating '\0' */
	hidpp_prefix_name(&name, __name_length + 1);

1015 1016 1017
	return name;
}

1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028
/* -------------------------------------------------------------------------- */
/* 0x1000: Battery level status                                               */
/* -------------------------------------------------------------------------- */

#define HIDPP_PAGE_BATTERY_LEVEL_STATUS				0x1000

#define CMD_BATTERY_LEVEL_STATUS_GET_BATTERY_LEVEL_STATUS	0x00
#define CMD_BATTERY_LEVEL_STATUS_GET_BATTERY_CAPABILITY		0x10

#define EVENT_BATTERY_LEVEL_STATUS_BROADCAST			0x00

1029 1030 1031 1032 1033 1034 1035 1036
#define FLAG_BATTERY_LEVEL_DISABLE_OSD				BIT(0)
#define FLAG_BATTERY_LEVEL_MILEAGE				BIT(1)
#define FLAG_BATTERY_LEVEL_RECHARGEABLE				BIT(2)

static int hidpp_map_battery_level(int capacity)
{
	if (capacity < 11)
		return POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
1037 1038 1039 1040 1041
	/*
	 * The spec says this should be < 31 but some devices report 30
	 * with brand new batteries and Windows reports 30 as "Good".
	 */
	else if (capacity < 30)
1042 1043 1044 1045 1046 1047
		return POWER_SUPPLY_CAPACITY_LEVEL_LOW;
	else if (capacity < 81)
		return POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
	return POWER_SUPPLY_CAPACITY_LEVEL_FULL;
}

1048
static int hidpp20_batterylevel_map_status_capacity(u8 data[3], int *capacity,
1049 1050
						    int *next_capacity,
						    int *level)
1051 1052 1053
{
	int status;

1054 1055
	*capacity = data[0];
	*next_capacity = data[1];
1056
	*level = POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN;
1057

1058 1059
	/* When discharging, we can rely on the device reported capacity.
	 * For all other states the device reports 0 (unknown).
1060 1061 1062 1063
	 */
	switch (data[2]) {
		case 0: /* discharging (in use) */
			status = POWER_SUPPLY_STATUS_DISCHARGING;
1064
			*level = hidpp_map_battery_level(*capacity);
1065 1066 1067 1068 1069 1070 1071 1072 1073
			break;
		case 1: /* recharging */
			status = POWER_SUPPLY_STATUS_CHARGING;
			break;
		case 2: /* charge in final stage */
			status = POWER_SUPPLY_STATUS_CHARGING;
			break;
		case 3: /* charge complete */
			status = POWER_SUPPLY_STATUS_FULL;
1074
			*level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
1075
			*capacity = 100;
1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090
			break;
		case 4: /* recharging below optimal speed */
			status = POWER_SUPPLY_STATUS_CHARGING;
			break;
		/* 5 = invalid battery type
		   6 = thermal error
		   7 = other charging error */
		default:
			status = POWER_SUPPLY_STATUS_NOT_CHARGING;
			break;
	}

	return status;
}

1091 1092 1093 1094
static int hidpp20_batterylevel_get_battery_capacity(struct hidpp_device *hidpp,
						     u8 feature_index,
						     int *status,
						     int *capacity,
1095 1096
						     int *next_capacity,
						     int *level)
1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112
{
	struct hidpp_report response;
	int ret;
	u8 *params = (u8 *)response.fap.params;

	ret = hidpp_send_fap_command_sync(hidpp, feature_index,
					  CMD_BATTERY_LEVEL_STATUS_GET_BATTERY_LEVEL_STATUS,
					  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;

1113
	*status = hidpp20_batterylevel_map_status_capacity(params, capacity,
1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145
							   next_capacity,
							   level);

	return 0;
}

static int hidpp20_batterylevel_get_battery_info(struct hidpp_device *hidpp,
						  u8 feature_index)
{
	struct hidpp_report response;
	int ret;
	u8 *params = (u8 *)response.fap.params;
	unsigned int level_count, flags;

	ret = hidpp_send_fap_command_sync(hidpp, feature_index,
					  CMD_BATTERY_LEVEL_STATUS_GET_BATTERY_CAPABILITY,
					  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;

	level_count = params[0];
	flags = params[1];

	if (level_count < 10 || !(flags & FLAG_BATTERY_LEVEL_MILEAGE))
		hidpp->capabilities |= HIDPP_CAPABILITY_BATTERY_LEVEL_STATUS;
	else
		hidpp->capabilities |= HIDPP_CAPABILITY_BATTERY_MILEAGE;
1146 1147 1148 1149 1150 1151 1152 1153

	return 0;
}

static int hidpp20_query_battery_info(struct hidpp_device *hidpp)
{
	u8 feature_type;
	int ret;
1154
	int status, capacity, next_capacity, level;
1155

1156
	if (hidpp->battery.feature_index == 0xff) {
1157 1158 1159 1160 1161 1162 1163 1164
		ret = hidpp_root_get_feature(hidpp,
					     HIDPP_PAGE_BATTERY_LEVEL_STATUS,
					     &hidpp->battery.feature_index,
					     &feature_type);
		if (ret)
			return ret;
	}

1165 1166 1167
	ret = hidpp20_batterylevel_get_battery_capacity(hidpp,
						hidpp->battery.feature_index,
						&status, &capacity,
1168 1169 1170 1171 1172 1173
						&next_capacity, &level);
	if (ret)
		return ret;

	ret = hidpp20_batterylevel_get_battery_info(hidpp,
						hidpp->battery.feature_index);
1174 1175 1176 1177
	if (ret)
		return ret;

	hidpp->battery.status = status;
1178
	hidpp->battery.capacity = capacity;
1179
	hidpp->battery.level = level;
1180 1181 1182
	/* the capacity is only available when discharging or full */
	hidpp->battery.online = status == POWER_SUPPLY_STATUS_DISCHARGING ||
				status == POWER_SUPPLY_STATUS_FULL;
1183 1184 1185 1186 1187 1188 1189 1190

	return 0;
}

static int hidpp20_battery_event(struct hidpp_device *hidpp,
				 u8 *data, int size)
{
	struct hidpp_report *report = (struct hidpp_report *)data;
1191
	int status, capacity, next_capacity, level;
1192 1193 1194 1195 1196 1197
	bool changed;

	if (report->fap.feature_index != hidpp->battery.feature_index ||
	    report->fap.funcindex_clientid != EVENT_BATTERY_LEVEL_STATUS_BROADCAST)
		return 0;

1198 1199
	status = hidpp20_batterylevel_map_status_capacity(report->fap.params,
							  &capacity,
1200 1201
							  &next_capacity,
							  &level);
1202

1203 1204 1205 1206
	/* the capacity is only available when discharging or full */
	hidpp->battery.online = status == POWER_SUPPLY_STATUS_DISCHARGING ||
				status == POWER_SUPPLY_STATUS_FULL;

1207
	changed = capacity != hidpp->battery.capacity ||
1208
		  level != hidpp->battery.level ||
1209 1210 1211
		  status != hidpp->battery.status;

	if (changed) {
1212
		hidpp->battery.level = level;
1213
		hidpp->battery.capacity = capacity;
1214 1215 1216 1217 1218 1219 1220 1221 1222
		hidpp->battery.status = status;
		if (hidpp->battery.ps)
			power_supply_changed(hidpp->battery.ps);
	}

	return 0;
}

static enum power_supply_property hidpp_battery_props[] = {
1223
	POWER_SUPPLY_PROP_ONLINE,
1224
	POWER_SUPPLY_PROP_STATUS,
1225
	POWER_SUPPLY_PROP_SCOPE,
1226 1227 1228
	POWER_SUPPLY_PROP_MODEL_NAME,
	POWER_SUPPLY_PROP_MANUFACTURER,
	POWER_SUPPLY_PROP_SERIAL_NUMBER,
1229 1230
	0, /* placeholder for POWER_SUPPLY_PROP_CAPACITY, */
	0, /* placeholder for POWER_SUPPLY_PROP_CAPACITY_LEVEL, */
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};

static int hidpp_battery_get_property(struct power_supply *psy,
				      enum power_supply_property psp,
				      union power_supply_propval *val)
{
	struct hidpp_device *hidpp = power_supply_get_drvdata(psy);
	int ret = 0;

	switch(psp) {
		case POWER_SUPPLY_PROP_STATUS:
			val->intval = hidpp->battery.status;
			break;
		case POWER_SUPPLY_PROP_CAPACITY:
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			val->intval = hidpp->battery.capacity;
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			break;
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		case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
			val->intval = hidpp->battery.level;
			break;
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		case POWER_SUPPLY_PROP_SCOPE:
			val->intval = POWER_SUPPLY_SCOPE_DEVICE;
			break;
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		case POWER_SUPPLY_PROP_ONLINE:
			val->intval = hidpp->battery.online;
			break;
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		case POWER_SUPPLY_PROP_MODEL_NAME:
			if (!strncmp(hidpp->name, "Logitech ", 9))
				val->strval = hidpp->name + 9;
			else
				val->strval = hidpp->name;
			break;
		case POWER_SUPPLY_PROP_MANUFACTURER:
			val->strval = "Logitech";
			break;
		case POWER_SUPPLY_PROP_SERIAL_NUMBER:
			val->strval = hidpp->hid_dev->uniq;
			break;
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		default:
			ret = -EINVAL;
			break;
	}

	return ret;
}