[PATCH v4 0/7] gpio: mockup: improve the user-space testing interface

From: Bartosz Golaszewski
Date: Thu Feb 14 2019 - 08:43:01 EST

From: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>

Hi Marc,

another try at the irq_sim stuff. This time I added a notifier chain to
irq_sim and made gpio-mockup register a notifier block. This way interested
users will get notified about a type config change.

v1 -> v2:
- instead of providing the irq_sim_get_type() helper, move the irq type
logic into the simulator and provide a helper that allows users to specify
the type of the fired interrupt

v2 -> v3:
- switch back to having irq_sim_type() and put the line state logic into the
GPIO testing module

v3- > v4:
- drop irq_sim_get_type() and use a notifier chain instead so that any change
in type configuration can be pushed out to interested users
- change the locking mechanism in gpio-mockup to a spinlock as we can't take
a mutex when a hardirq-safe spinlock in irq_desc is being held when the
irq_set_type() callback is called
- refuse to set any other type than falling or rising edge in irq_set_config

Bartosz Golaszewski (7):
irq/irq_sim: add a notifier chain
gpio: mockup: add locking
gpio: mockup: implement get_multiple()
gpio: mockup: don't create the debugfs link named after the label
gpio: mockup: change the type of 'offset' to unsigned int
gpio: mockup: change the signature of unlocked get/set helpers
gpio: mockup: rework debugfs interface

drivers/gpio/gpio-mockup.c | 215 ++++++++++++++++++++++++++++++++-----
include/linux/irq_sim.h | 22 +++-
kernel/irq/irq_sim.c | 40 +++++++
3 files changed, 246 insertions(+), 31 deletions(-)