Haiku Community

Status on i2c support?

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bighill November 18, 2024, 5:36pm 1

I’ve been reading up on previous threads on i2c hardware, such as touchpads. The most recent thread I could fint is from late last year.

What is the status on this in b5 as of now?
Are there any updates or recent developments on this?

Been wanting to take my X1 g9 over to Haiku, but while testing on live environment I’ve found that that the touchpad sadly doesn’t work… trackpoint works though, but that is now as elegant an efficient.
External mouse is only an option when not using it on the go…

marcoapc November 19, 2024, 4:13pm 2

Not much, you can see the Beta 5 changelog and there are important tickets open:

https://dev.haiku-os.org/wiki/R1/Beta5/GitChangelog

https://dev.haiku-os.org/query?component=Drivers%2FInput%2FHID%2FI2C&status=!closed

1 Like

MichaelPeppers November 19, 2024, 5:37pm 3

It probably depends on how old the hardware is, the touchpad on my c.ca 2018 Samsung laptop works okay, but is detected as a 3-button PS/2 mouse (and it only has 2 buttons)

Lt_Henry November 20, 2024, 3:21pm 4

We have support for PCH i2c bus, and HID devices on top of that, as touchpads or touchscreens. Even some specific devices as ELAN.

We lack however, support for designware i2c bus, and it is widely used today. I would like to help with this but I have no experience with this kind of drivers.

2 Likes

marcoapc November 20, 2024, 9:46pm 5

OpenBSD and NetBSD use the same dwiic driver, it’s interesting to see the source code and this documentation:

gist.github.com

https://gist.github.com/jcs/0973ae50738e58ae40d2bd11270acc3b

ihidev.md

## The Problem

- I2C-connected Windows Precision Touchpads on Skylake and newer laptops don't generate interrupts through the IOAPIC when using OpenBSD - polling has to be used to fetch touchpad data

### OpenBSD

````
ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 20, 120 pins
[...]
dwiic0 at pci0 dev 21 function 0 "Intel 100 Series I2C" rev 0x21: apic 2 int 16

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https://iccircle.com/static/upload/img20240313113743.pdf

Here is the driver source code for zephyrproject-rtos, interesting as a reference:

github.com

zephyrproject-rtos/zephyr/blob/main/drivers/i2c/i2c_dw.c

/* dw_i2c.c - I2C file for Design Ware */

/*
 * Copyright (c) 2015 Intel Corporation
 * Copyright (c) 2022 Andrei-Edward Popa
 *
 * SPDX-License-Identifier: Apache-2.0
 */
#include <stddef.h>
#include <zephyr/types.h>
#include <stdlib.h>
#include <stdbool.h>

#include <zephyr/drivers/i2c.h>
#include <zephyr/kernel.h>
#include <zephyr/init.h>
#include <zephyr/pm/device.h>
#include <zephyr/arch/cpu.h>
#include <string.h>

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github.com

zephyrproject-rtos/zephyr/blob/main/drivers/i2c/Kconfig.dw

# Copyright (c) 2018 Intel Corporation
# SPDX-License-Identifier: Apache-2.0

menuconfig I2C_DW
	bool "Design Ware I2C support"
	default y
	depends on DT_HAS_SNPS_DESIGNWARE_I2C_ENABLED
	help
	  Enable the Design Ware I2C driver

config I2C_DW_CLOCK_SPEED
	int "Set the clock speed for I2C"
	depends on I2C_DW
	default 32

config I2C_DW_LPSS_DMA
	bool "Use I2C integrated DMA for asynchronous transfer"
	depends on I2C_DW
	select DMA
	select DMA_INTEL_LPSS

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github.com

zephyrproject-rtos/zephyr/blob/main/drivers/i2c/i2c_dw.h

/* dw_i2c.h - header for Design Ware I2C operations */

/*
 * Copyright (c) 2015 Intel Corporation
 *
 * SPDX-License-Identifier: Apache-2.0
 */
#ifndef ZEPHYR_DRIVERS_I2C_I2C_DW_H_
#define ZEPHYR_DRIVERS_I2C_I2C_DW_H_

#include <zephyr/drivers/i2c.h>
#include <stdbool.h>

#define DT_DRV_COMPAT snps_designware_i2c

#if DT_ANY_INST_ON_BUS_STATUS_OKAY(pcie)
BUILD_ASSERT(IS_ENABLED(CONFIG_PCIE), "DW I2C in DT needs CONFIG_PCIE");
#include <zephyr/drivers/pcie/pcie.h>
#endif

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github.com

zephyrproject-rtos/zephyr/blob/main/drivers/i2c/i2c_dw_registers.h

/* i2c_dw_registers.h - array access for I2C Design Ware registers */

/*
 * Copyright (c) 2015 Intel Corporation
 *
 * SPDX-License-Identifier: Apache-2.0
 */
#ifndef ZEPHYR_DRIVERS_I2C_I2C_DW_REGISTERS_H_
#define ZEPHYR_DRIVERS_I2C_I2C_DW_REGISTERS_H_

#ifdef __cplusplus
extern "C" {
#endif

/*  IC_CON bits */
union ic_con_register {
	uint32_t raw;
	struct {
		uint32_t master_mode: 1 __packed;
		uint32_t speed: 2 __packed;

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1 Like

bighill November 21, 2024, 5:03pm 6

Interesting… hopefullt someone can manage to compile a driver for this on Haiku.
I love that Haiku supports and runs on old HW, but I also love modern laptops with more portability and longer batterylife…

1 Like

ubu January 2, 2025, 1:51pm 7

Don’t diss the trackpoint

The thing i was missing was the universalscroller package, so i can scroll using middle mouse + trackpoint to scroll

1 Like

bighill January 2, 2025, 2:40pm 8

UniversalScroller works for me. Alas, there is no replacing a touchpad with multitouch.

Lt_Henry January 2, 2025, 3:09pm 9

There are some moderated good news here. I’ve pushed an i2c bus driver and it is being reviewed right now.

I’ve tested on a pair of laptops and trackpads works… but there are glitches to fix on the HID layer also (we are not ready for multi-touch events).

So… I guess that somewhere in this 2025 we should have modern trackpads working.

12 Likes

bighill January 2, 2025, 4:41pm 10

I KNEW this would be a good year! <3

2 Likes

bighill February 28, 2025, 3:27pm 11

Any news on this? fingerscrossed
I’ve been testing the Nightlies, but still no touchpad.

2 Likes