From: Rob Herring <robherring2@gmail.com> To: Stephen Warren <swarren@nvidia.com> Cc: Thomas Gleixner <tglx@linutronix.de>, Mark Brown <broonie@opensource.wolfsonmicro.com>, Liam Girdwood <lrg@ti.com>, Chris Ball <cjb@laptop.org>, ccross@android.com, olof@lixom.net, alsa-devel@alsa-project.org, linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-tegra@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH 1/3] irq: If an IRQ is a GPIO, request and configure it Date: Thu, 04 Aug 2011 20:54:59 -0500 [thread overview] Message-ID: <4E3B4D73.9030505@gmail.com> (raw) In-Reply-To: <1312498820-2275-2-git-send-email-swarren@nvidia.com> On 08/04/2011 06:00 PM, Stephen Warren wrote: > Many IRQs are associated with GPIO pins. When the pin is used as an IRQ, > it can't be used as anything else; it should be requested. Enhance the > core interrupt code to call gpio_request() and gpio_direction_input() for > any IRQ that is also a GPIO. This prevents duplication of these calls in > each driver that uses an IRQ. > > Signed-off-by: Stephen Warren <swarren@nvidia.com> > --- > kernel/irq/manage.c | 23 +++++++++++++++++++++-- > 1 files changed, 21 insertions(+), 2 deletions(-) > > diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c > index 0a7840a..6e2db72 100644 > --- a/kernel/irq/manage.c > +++ b/kernel/irq/manage.c > @@ -7,6 +7,7 @@ > * This file contains driver APIs to the irq subsystem. > */ > > +#include <linux/gpio.h> > #include <linux/irq.h> > #include <linux/kthread.h> > #include <linux/module.h> > @@ -875,7 +876,7 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new) > struct irqaction *old, **old_ptr; > const char *old_name = NULL; > unsigned long flags, thread_mask = 0; > - int ret, nested, shared = 0; > + int ret, nested, shared = 0, gpio = -1; > cpumask_var_t mask; > > if (!desc) > @@ -978,6 +979,16 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new) > old = *old_ptr; > } while (old); > shared = 1; > + } else { > + gpio = irq_to_gpio(irq); If you read the documentation for gpio, it is not recommended to use irq_to_gpio. There's only a handful of users. Part of the problem is it is platform specific and the gpio core cannot convert irq to gpio number. Here is the relevant section: Non-error values returned from irq_to_gpio() would most commonly be used with gpio_get_value(), for example to initialize or update driver state when the IRQ is edge-triggered. Note that some platforms don't support this reverse mapping, so you should avoid using it. Rob > + if (gpio_is_valid(gpio)) { > + ret = gpio_request(gpio, new->name); > + if (ret < 0) > + goto out_mask; > + ret = gpio_direction_input(gpio); > + if (ret < 0) > + goto out_mask; > + } > } > > /* > @@ -1083,6 +1094,8 @@ mismatch: > ret = -EBUSY; > > out_mask: > + if (gpio_is_valid(gpio)) > + gpio_free(gpio); > raw_spin_unlock_irqrestore(&desc->lock, flags); > free_cpumask_var(mask); > > @@ -1127,6 +1140,7 @@ static struct irqaction *__free_irq(unsigned int irq, void *dev_id) > struct irq_desc *desc = irq_to_desc(irq); > struct irqaction *action, **action_ptr; > unsigned long flags; > + int gpio; > > WARN(in_interrupt(), "Trying to free IRQ %d from IRQ context!\n", irq); > > @@ -1165,8 +1179,13 @@ static struct irqaction *__free_irq(unsigned int irq, void *dev_id) > #endif > > /* If this was the last handler, shut down the IRQ line: */ > - if (!desc->action) > + if (!desc->action) { > irq_shutdown(desc); > + /* If the IRQ line is a GPIO, it's no longer in use */ > + gpio = irq_to_gpio(irq); > + if (gpio_is_valid(gpio)) > + gpio_free(gpio); > + } > > #ifdef CONFIG_SMP > /* make sure affinity_hint is cleaned up */
WARNING: multiple messages have this Message-ID (diff)
From: robherring2@gmail.com (Rob Herring) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH 1/3] irq: If an IRQ is a GPIO, request and configure it Date: Thu, 04 Aug 2011 20:54:59 -0500 [thread overview] Message-ID: <4E3B4D73.9030505@gmail.com> (raw) In-Reply-To: <1312498820-2275-2-git-send-email-swarren@nvidia.com> On 08/04/2011 06:00 PM, Stephen Warren wrote: > Many IRQs are associated with GPIO pins. When the pin is used as an IRQ, > it can't be used as anything else; it should be requested. Enhance the > core interrupt code to call gpio_request() and gpio_direction_input() for > any IRQ that is also a GPIO. This prevents duplication of these calls in > each driver that uses an IRQ. > > Signed-off-by: Stephen Warren <swarren@nvidia.com> > --- > kernel/irq/manage.c | 23 +++++++++++++++++++++-- > 1 files changed, 21 insertions(+), 2 deletions(-) > > diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c > index 0a7840a..6e2db72 100644 > --- a/kernel/irq/manage.c > +++ b/kernel/irq/manage.c > @@ -7,6 +7,7 @@ > * This file contains driver APIs to the irq subsystem. > */ > > +#include <linux/gpio.h> > #include <linux/irq.h> > #include <linux/kthread.h> > #include <linux/module.h> > @@ -875,7 +876,7 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new) > struct irqaction *old, **old_ptr; > const char *old_name = NULL; > unsigned long flags, thread_mask = 0; > - int ret, nested, shared = 0; > + int ret, nested, shared = 0, gpio = -1; > cpumask_var_t mask; > > if (!desc) > @@ -978,6 +979,16 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new) > old = *old_ptr; > } while (old); > shared = 1; > + } else { > + gpio = irq_to_gpio(irq); If you read the documentation for gpio, it is not recommended to use irq_to_gpio. There's only a handful of users. Part of the problem is it is platform specific and the gpio core cannot convert irq to gpio number. Here is the relevant section: Non-error values returned from irq_to_gpio() would most commonly be used with gpio_get_value(), for example to initialize or update driver state when the IRQ is edge-triggered. Note that some platforms don't support this reverse mapping, so you should avoid using it. Rob > + if (gpio_is_valid(gpio)) { > + ret = gpio_request(gpio, new->name); > + if (ret < 0) > + goto out_mask; > + ret = gpio_direction_input(gpio); > + if (ret < 0) > + goto out_mask; > + } > } > > /* > @@ -1083,6 +1094,8 @@ mismatch: > ret = -EBUSY; > > out_mask: > + if (gpio_is_valid(gpio)) > + gpio_free(gpio); > raw_spin_unlock_irqrestore(&desc->lock, flags); > free_cpumask_var(mask); > > @@ -1127,6 +1140,7 @@ static struct irqaction *__free_irq(unsigned int irq, void *dev_id) > struct irq_desc *desc = irq_to_desc(irq); > struct irqaction *action, **action_ptr; > unsigned long flags; > + int gpio; > > WARN(in_interrupt(), "Trying to free IRQ %d from IRQ context!\n", irq); > > @@ -1165,8 +1179,13 @@ static struct irqaction *__free_irq(unsigned int irq, void *dev_id) > #endif > > /* If this was the last handler, shut down the IRQ line: */ > - if (!desc->action) > + if (!desc->action) { > irq_shutdown(desc); > + /* If the IRQ line is a GPIO, it's no longer in use */ > + gpio = irq_to_gpio(irq); > + if (gpio_is_valid(gpio)) > + gpio_free(gpio); > + } > > #ifdef CONFIG_SMP > /* make sure affinity_hint is cleaned up */
next prev parent reply other threads:[~2011-08-05 1:54 UTC|newest] Thread overview: 73+ messages / expand[flat|nested] mbox.gz Atom feed top 2011-08-04 23:00 [RFC PATCH 0/3] If an IRQ is a GPIO, request and configure it Stephen Warren 2011-08-04 23:00 ` Stephen Warren 2011-08-04 23:00 ` Stephen Warren [not found] ` <1312498820-2275-1-git-send-email-swarren-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> 2011-08-04 23:00 ` [PATCH 1/3] irq: " Stephen Warren 2011-08-04 23:00 ` Stephen Warren 2011-08-04 23:00 ` Stephen Warren 2011-08-05 0:01 ` Mark Brown 2011-08-05 0:01 ` Mark Brown 2011-08-05 0:01 ` Mark Brown [not found] ` <20110805000148.GB13321-yzvPICuk2AATkU/dhu1WVueM+bqZidxxQQ4Iyu8u01E@public.gmane.org> 2011-08-05 3:53 ` Stephen Warren 2011-08-05 3:53 ` Stephen Warren 2011-08-05 3:53 ` Stephen Warren 2011-08-05 5:35 ` Mark Brown 2011-08-05 5:35 ` Mark Brown 2011-08-05 5:35 ` Mark Brown [not found] ` <20110805053510.GA16956-yzvPICuk2AATkU/dhu1WVueM+bqZidxxQQ4Iyu8u01E@public.gmane.org> 2011-08-05 8:06 ` Ben Dooks 2011-08-05 8:06 ` Ben Dooks 2011-08-05 8:06 ` Ben Dooks 2011-08-05 8:29 ` Mark Brown 2011-08-05 8:29 ` Mark Brown 2011-08-05 8:29 ` Mark Brown 2011-08-05 15:29 ` Stephen Warren 2011-08-05 15:29 ` Stephen Warren 2011-08-05 15:29 ` Stephen Warren 2011-08-05 16:15 ` Mark Brown 2011-08-05 16:15 ` Mark Brown 2011-08-05 16:15 ` Mark Brown 2011-08-05 1:54 ` Rob Herring [this message] 2011-08-05 1:54 ` Rob Herring 2011-08-05 4:05 ` Stephen Warren 2011-08-05 4:05 ` Stephen Warren 2011-08-05 4:05 ` Stephen Warren 2011-08-05 7:58 ` Ben Dooks 2011-08-05 7:58 ` Ben Dooks 2011-09-02 8:36 ` Thomas Gleixner 2011-09-02 8:36 ` Thomas Gleixner 2011-09-02 15:24 ` Stephen Warren 2011-09-02 15:24 ` Stephen Warren 2011-09-02 15:24 ` Stephen Warren [not found] ` <74CDBE0F657A3D45AFBB94109FB122FF04B327A55C-C7FfzLzN0UxDw2glCA4ptUEOCMrvLtNR@public.gmane.org> 2011-09-02 15:34 ` Stephen Warren 2011-09-02 15:34 ` Stephen Warren 2011-09-02 15:34 ` Stephen Warren 2011-09-02 15:50 ` Thomas Gleixner 2011-09-02 15:50 ` Thomas Gleixner 2011-09-02 15:50 ` Thomas Gleixner 2011-08-04 23:00 ` [PATCH 2/3] mmc: tegra: Don't gpio_request GPIOs used as IRQs Stephen Warren 2011-08-04 23:00 ` Stephen Warren 2011-08-04 23:00 ` Stephen Warren 2011-08-04 23:00 ` [PATCH 3/3] ASoC: jack_add_gpios: " Stephen Warren 2011-08-04 23:00 ` Stephen Warren 2011-08-04 23:00 ` Stephen Warren 2011-08-05 7:55 ` [RFC PATCH 0/3] If an IRQ is a GPIO, request and configure it Ben Dooks 2011-08-05 7:55 ` Ben Dooks 2011-08-05 7:55 ` Ben Dooks 2011-08-05 9:40 ` Russell King - ARM Linux 2011-08-05 9:40 ` Russell King - ARM Linux [not found] ` <20110805094017.GC20575-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org> 2011-08-05 10:30 ` Ben Dooks 2011-08-05 10:30 ` Ben Dooks 2011-08-05 10:30 ` Ben Dooks 2011-08-05 20:25 ` Linus Walleij 2011-08-05 20:25 ` Linus Walleij 2011-08-05 15:43 ` Stephen Warren 2011-08-05 15:43 ` Stephen Warren 2011-08-05 15:43 ` Stephen Warren 2011-08-05 19:15 ` Russell King - ARM Linux 2011-08-05 19:15 ` Russell King - ARM Linux 2011-08-05 19:15 ` Russell King - ARM Linux 2011-08-05 19:33 ` Stephen Warren 2011-08-05 19:33 ` Stephen Warren 2011-08-05 19:33 ` Stephen Warren 2011-08-05 21:40 ` Russell King - ARM Linux 2011-08-05 21:40 ` Russell King - ARM Linux 2011-08-05 21:40 ` Russell King - ARM Linux
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