linux-kernel - [PATCH v2 0/3] Introduce the ACCES IDIO-16 GPIO library module

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Date:   Sun, 18 Sep 2022 12:50:42 -0400
From:   William Breathitt Gray <william.gray@...aro.org>
To:     brgl@...ev.pl, linus.walleij@...aro.org
Cc:     linux-kernel@...r.kernel.org, andriy.shevchenko@...el.com,
        linux-gpio@...r.kernel.org,
        William Breathitt Gray <william.gray@...aro.org>
Subject: [PATCH v2 0/3] Introduce the ACCES IDIO-16 GPIO library module

Changes in v2:
 - Added offset check for last byte of inputs in idio_16_get() for
   robustness
 - Replaced hardcoded '16' with IDIO_16_NOUT constant in idio_16_get*()
 - Renamed IDIO_16 namespace to GPIO_IDIO_16; adjusted 104-idio-16 and
   pci-idio-16 drivers accordingly
 - Utilized DEFAULT_SYMBOL_NAMESPACE to simplify namespace exports
 - Refactored callbacks to utilize cached output states; idio_16_get()
   callback now requires struct idio_16_state state; adjusted
   104-idio-16 and pci-idio-16 drivers accordingly
 - Moved bitmap_fill() to after idio_16_state_init() in idio_16_probe()
   to prevent clobbering out_state if the implementation of
   idio_16_state_init changes in the future
 - Adjusted offset checks in idio_16_set() and idio_16_get_direction()
   to ">= IDIO_16_NOUT" for consistency
 - Utilized __assign_bit() in idio_16_set()
 - Refactored idio_16_*_multiple() callbacks to utilize bitmap_replace()

In a similar vein as the Intel 8255 interface library module [0], the
ACCES IDIO-16 GPIO library module is introduced to consolidate much of
the shared code between the existing 104-IDIO-16 and PCI-IDIO-16 GPIO
drivers.

The idio-16 module exposes consumer library functions to facilitate
communication with devices within the ACCES IDIO-16 family such as the
104-IDIO-16 and the PCI-IDIO-16.

A CONFIG_GPIO_IDIO_16 Kconfig option is introduced by this patch.
Modules wanting access to these idio-16 library functions should select
this Kconfig option and import the GPIO_IDIO_16 symbol namespace.

[0] https://lore.kernel.org/all/d1a24895f2ea67f689c24c34a20ddb43cd7246af.1658324498.git.william.gray@linaro.org/

William Breathitt Gray (3):
  gpio: idio-16: Introduce the ACCES IDIO-16 GPIO library module
  gpio: 104-idio-16: Utilize the idio-16 GPIO library
  gpio: pci-idio-16: Utilize the idio-16 GPIO library

 MAINTAINERS                     |   7 ++
 drivers/gpio/Kconfig            |  11 +++
 drivers/gpio/Makefile           |   1 +
 drivers/gpio/gpio-104-idio-16.c |  88 ++++---------------
 drivers/gpio/gpio-idio-16.c     | 146 ++++++++++++++++++++++++++++++++
 drivers/gpio/gpio-idio-16.h     |  71 ++++++++++++++++
 drivers/gpio/gpio-pci-idio-16.c | 119 +++-----------------------
 7 files changed, 265 insertions(+), 178 deletions(-)
 create mode 100644 drivers/gpio/gpio-idio-16.c
 create mode 100644 drivers/gpio/gpio-idio-16.h


base-commit: d9e7f0e320516c660d6f33e6c16a3d99970eb14e
-- 
2.37.3