linux-kernel - [PATCH v5 0/1] Add a driver for the ChromeOS human presence sensor (HPS)

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Message-Id: <20221012040918.272582-1-dcallagh@chromium.org>
Date:   Wed, 12 Oct 2022 15:09:17 +1100
From:   Dan Callaghan <dcallagh@...omium.org>
To:     chrome-platform@...ts.linux.dev
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Sami Kyöstilä <skyostil@...omium.org>,
        Benson Leung <bleung@...omium.org>,
        Tzung-Bi Shih <tzungbi@...nel.org>,
        Dan Callaghan <dcallagh@...omium.org>
Subject: [PATCH v5 0/1] Add a driver for the ChromeOS human presence sensor (HPS)

This series adds a driver for the ChromeOS human presence sensor
(a.k.a. HPS) device, attached on the I2C bus. The sensor is a
hardware-isolated module which reports a high-level presence signal,
e.g., whether there is person in front of the computer or not.

The driver exposes the device to userspace as a character device, which
can be used to control the power state of the device. The driver
automatically turns power off to the sensor unless a process is using
it.

More information about HPS, its firmware and communication protocol can
be found at
https://chromium.googlesource.com/chromiumos/platform/hps-firmware.

Changes in v5:
- Updated MAINTAINERS.

Changes in v4:
- Simplified open/release pm logic.
- Renamed device to "cros-hps".
- Stylistics cleanups.

Changes in v3:
- Moved from drivers/misc to drivers/platform/chrome.

Changes in v2:
- Removed custom ioctl interface.
- Reworked to use miscdev.

Sami Kyöstilä (1):
  platform/chrome: add a driver for HPS

 MAINTAINERS                            |   6 +
 drivers/platform/chrome/Kconfig        |  10 ++
 drivers/platform/chrome/Makefile       |   1 +
 drivers/platform/chrome/cros_hps_i2c.c | 151 +++++++++++++++++++++++++
 4 files changed, 168 insertions(+)
 create mode 100644 drivers/platform/chrome/cros_hps_i2c.c

base-commit: 8edd2752b0aa498b3a61f3caee8f79f7e0567fad
-- 
2.38.0.rc1.362.ged0d419d3c-goog