On Tue, 12 Feb 2019 13:15:54 +0000,
Bartosz Golaszewski <[email protected]> wrote:
>
> From: Bartosz Golaszewski <[email protected]>
>
> Provide a helper that allows users to retrieve the current irq type
> of dummy interrupts.
>
> Internally: store the type in the line context when the irq_set_type()
> callback is called.
>
> This is required by the gpio-mockup module which wants to track the
> state of GPIO lines and simulate rising and falling edge interrupts.
>
> Signed-off-by: Bartosz Golaszewski <[email protected]>
> ---
> include/linux/irq_sim.h | 2 ++
> kernel/irq/irq_sim.c | 23 +++++++++++++++++++++++
> 2 files changed, 25 insertions(+)
>
> diff --git a/include/linux/irq_sim.h b/include/linux/irq_sim.h
> index 4500d453a63e..c73be0a2c15c 100644
> --- a/include/linux/irq_sim.h
> +++ b/include/linux/irq_sim.h
> @@ -22,6 +22,7 @@ struct irq_sim_work_ctx {
> struct irq_sim_irq_ctx {
> int irqnum;
> bool enabled;
> + int type;
> };
>
> struct irq_sim {
> @@ -37,5 +38,6 @@ int devm_irq_sim_init(struct device *dev, struct irq_sim
> *sim,
> void irq_sim_fini(struct irq_sim *sim);
> void irq_sim_fire(struct irq_sim *sim, unsigned int offset);
> int irq_sim_irqnum(struct irq_sim *sim, unsigned int offset);
> +unsigned int irq_sim_get_type(struct irq_sim *sim, unsigned int offset);
>
> #endif /* _LINUX_IRQ_SIM_H */
> diff --git a/kernel/irq/irq_sim.c b/kernel/irq/irq_sim.c
> index 98a20e1594ce..74561a0dca65 100644
> --- a/kernel/irq/irq_sim.c
> +++ b/kernel/irq/irq_sim.c
> @@ -25,10 +25,20 @@ static void irq_sim_irqunmask(struct irq_data *data)
> irq_ctx->enabled = true;
> }
>
> +static int irq_sim_set_type(struct irq_data *data, unsigned int type)
> +{
> + struct irq_sim_irq_ctx *irq_ctx = irq_data_get_irq_chip_data(data);
> +
> + irq_ctx->type = type;
> +
> + return 0;
> +}
In the cover letter, you say you only support edge. And yet you don't
reject any of the level configuration. That's not right.
> +
> static struct irq_chip irq_sim_irqchip = {
> .name = "irq_sim",
> .irq_mask = irq_sim_irqmask,
> .irq_unmask = irq_sim_irqunmask,
> + .irq_set_type = irq_sim_set_type,
> };
>
> static void irq_sim_handle_irq(struct irq_work *work)
> @@ -180,3 +190,16 @@ int irq_sim_irqnum(struct irq_sim *sim, unsigned int
> offset)
> return sim->irqs[offset].irqnum;
> }
> EXPORT_SYMBOL_GPL(irq_sim_irqnum);
> +
> +/**
> + * irq_sim_get_type - Get the type configuration for a dummy interrupt.
> + *
> + * @sim: The interrupt simulator object.
> + * @offset: Offset of the simulated interrupt for which to retrieve
> + * the type.
> + */
> +unsigned int irq_sim_get_type(struct irq_sim *sim, unsigned int offset)
> +{
> + return sim->irqs[offset].type;
> +}
> +EXPORT_SYMBOL_GPL(irq_sim_get_type);
This just shows that the way you have architected the whole thing is
backward. The irq_set_type callback should push the configuration
wherever it makes sense instead of offering a retrieving API exposing
random bits of the data structures.
Thanks,
M.
--
Jazz is not dead, it just smell funny.
