1. 18 Oct, 2019 1 commit
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    • David Howells's avatar
      Annotate hardware config module parameters in drivers/gpio/ · d759f906
      David Howells authored
      When the kernel is running in secure boot mode, we lock down the kernel to
      prevent userspace from modifying the running kernel image.  Whilst this
      includes prohibiting access to things like /dev/mem, it must also prevent
      access by means of configuring driver modules in such a way as to cause a
      device to access or modify the kernel image.
      To this end, annotate module_param* statements that refer to hardware
      configuration and indicate for future reference what type of parameter they
      specify.  The parameter parser in the core sees this information and can
      skip such parameters with an error message if the kernel is locked down.
      The module initialisation then runs as normal, but just sees whatever the
      default values for those parameters is.
      Note that we do still need to do the module initialisation because some
      drivers have viable defaults set in case parameters aren't specified and
      some drivers support automatic configuration (e.g. PNP or PCI) in addition
      to manually coded parameters.
      This patch annotates drivers in drivers/gpio/.
      Suggested-by: default avatarAlan Cox <gnomes@lxorguk.ukuu.org.uk>
      Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      Acked-by: default avatarWilliam Breathitt Gray <vilhelm.gray@gmail.com>
      Acked-by: default avatarLinus Walleij <linus.walleij@linaro.org>
      cc: Alexandre Courbot <gnurou@gmail.com>
      cc: linux-gpio@vger.kernel.org
  9. 28 Mar, 2017 1 commit
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  11. 26 Jan, 2017 1 commit
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    • William Breathitt Gray's avatar
      gpio: Add GPIO support for the ACCES 104-IDI-48 · 6ddcf9b4
      William Breathitt Gray authored
      The ACCES 104-IDI-48 family of PC/104 utility boards feature 48
      individually optically isolated digital inputs. Enabled inputs feature
      change-of-state detection capability; if change-of-state detection is
      enabled, an interrupt is fired off if a change of input level
      (low-to-high or high-to-low) is detected. Change-of-state IRQs are
      enabled/disabled on 8-bit boundaries, for a total of six boundaries.
      This driver provides GPIO and IRQ support for these 48 channels of
      digital input. The base port address for the device may be configured
      via the idi_48_base module parameter. The interrupt line number for the
      device may be configured via the idi_48_irq module parameter.
      Signed-off-by: default avatarWilliam Breathitt Gray <vilhelm.gray@gmail.com>
      Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>