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Message-ID: <20180622001124.GF79890@dtor-ws>
Date: Thu, 21 Jun 2018 17:11:24 -0700
From: Dmitry Torokhov <dmitry.torokhov@...il.com>
To: Janusz Krzysztofik <jmkrzyszt@...il.com>
Cc: Tony Lindgren <tony@...mide.com>,
Aaro Koskinen <aaro.koskinen@....fi>,
"David S . Miller " <davem@...emloft.net>,
Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Randy Dunlap <rdunlap@...radead.org>,
Linus Walleij <linus.walleij@...aro.org>,
Mark Brown <broonie@...nel.org>,
Liam Girdwood <lgirdwood@...il.com>,
linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org,
linux-input@...r.kernel.org, linux-gpio@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 09/10] Input: ams_delta_serio: use IRQ resource
On Fri, Jun 22, 2018 at 12:41:27AM +0200, Janusz Krzysztofik wrote:
> The driver still obtains IRQ number from a hardcoded GPIO. Use IRQ
> resource instead.
>
> For this to work on Amstrad Delta, add the IRQ resource to
> ams-delta-serio platform device structure. Obtain the IRQ number
> assigned to "keybrd_clk" GPIO pin from FIQ initialization routine.
>
> As a benefit, the driver no longer needs to include
> <mach/board-ams-delta.h>.
>
> Signed-off-by: Janusz Krzysztofik <jmkrzyszt@...il.com>
Input bits look good.
Acked-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
> ---
> Changelog:
> v2: - obsolete assignment of handle_simple_irq() removed from the driver
> and replaced with a comment in the FIQ init file,
> - rebased on v4.18-rc1, no conflicts.
>
> arch/arm/mach-omap1/ams-delta-fiq.c | 20 +++++++++++++++++++-
> arch/arm/mach-omap1/ams-delta-fiq.h | 3 ++-
> arch/arm/mach-omap1/board-ams-delta.c | 17 ++++++++++++++++-
> drivers/input/serio/ams_delta_serio.c | 32 +++++++++-----------------------
> 4 files changed, 46 insertions(+), 26 deletions(-)
>
> diff --git a/arch/arm/mach-omap1/ams-delta-fiq.c b/arch/arm/mach-omap1/ams-delta-fiq.c
> index e72935034d42..82ca4246a5e4 100644
> --- a/arch/arm/mach-omap1/ams-delta-fiq.c
> +++ b/arch/arm/mach-omap1/ams-delta-fiq.c
> @@ -20,6 +20,7 @@
> #include <linux/module.h>
> #include <linux/io.h>
> #include <linux/platform_data/ams-delta-fiq.h>
> +#include <linux/platform_device.h>
>
> #include <mach/board-ams-delta.h>
>
> @@ -84,7 +85,8 @@ static irqreturn_t deferred_fiq(int irq, void *dev_id)
> return IRQ_HANDLED;
> }
>
> -void __init ams_delta_init_fiq(struct gpio_chip *chip)
> +void __init ams_delta_init_fiq(struct gpio_chip *chip,
> + struct platform_device *serio)
> {
> struct gpio_desc *gpiod, *data = NULL, *clk = NULL;
> void *fiqhandler_start;
> @@ -201,6 +203,22 @@ void __init ams_delta_init_fiq(struct gpio_chip *chip)
> val = omap_readl(OMAP_IH1_BASE + offset) | 1;
> omap_writel(val, OMAP_IH1_BASE + offset);
>
> + /* Initialize serio device IRQ resource */
> + serio->resource[0].start = gpiod_to_irq(clk);
> + serio->resource[0].end = serio->resource[0].start;
> +
> + /*
> + * Since FIQ handler performs handling of GPIO registers for
> + * "keybrd_clk" IRQ pin, ams_delta_serio driver used to set
> + * handle_simple_irq() as active IRQ handler for that pin to avoid
> + * bad interaction with gpio-omap driver. This is no longer needed
> + * as handle_simple_irq() is now the default handler for OMAP GPIO
> + * edge interrupts.
> + * This comment replaces the obsolete code which has been removed
> + * from the ams_delta_serio driver and stands here only as a reminder
> + * of that dependency on gpio-omap driver behavior.
> + */
> +
> return;
>
> out_gpio:
> diff --git a/arch/arm/mach-omap1/ams-delta-fiq.h b/arch/arm/mach-omap1/ams-delta-fiq.h
> index 3f691d68aa62..fd76df3cce37 100644
> --- a/arch/arm/mach-omap1/ams-delta-fiq.h
> +++ b/arch/arm/mach-omap1/ams-delta-fiq.h
> @@ -35,7 +35,8 @@
> #ifndef __ASSEMBLER__
> extern unsigned char qwerty_fiqin_start, qwerty_fiqin_end;
>
> -extern void __init ams_delta_init_fiq(struct gpio_chip *chip);
> +extern void __init ams_delta_init_fiq(struct gpio_chip *chip,
> + struct platform_device *pdev);
> #endif
>
> #endif
> diff --git a/arch/arm/mach-omap1/board-ams-delta.c b/arch/arm/mach-omap1/board-ams-delta.c
> index fe9a3e7cbfeb..84177ba3e39a 100644
> --- a/arch/arm/mach-omap1/board-ams-delta.c
> +++ b/arch/arm/mach-omap1/board-ams-delta.c
> @@ -504,9 +504,24 @@ static struct platform_device cx20442_codec_device = {
> .id = -1,
> };
>
> +static struct resource ams_delta_serio_resources[] = {
> + {
> + .flags = IORESOURCE_IRQ,
> + /*
> + * Initialize IRQ resource with invalid IRQ number.
> + * It will be replaced with dynamically allocated GPIO IRQ
> + * obtained from GPIO chip as soon as the chip is available.
> + */
> + .start = -EINVAL,
> + .end = -EINVAL,
> + },
> +};
> +
> static struct platform_device ams_delta_serio_device = {
> .name = "ams-delta-serio",
> .id = PLATFORM_DEVID_NONE,
> + .num_resources = ARRAY_SIZE(ams_delta_serio_resources),
> + .resource = ams_delta_serio_resources,
> };
>
> static struct regulator_consumer_supply keybrd_pwr_consumers[] = {
> @@ -615,7 +630,7 @@ static void __init omap_gpio_deps_init(void)
> return;
> }
>
> - ams_delta_init_fiq(chip);
> + ams_delta_init_fiq(chip, &ams_delta_serio_device);
> }
>
> static void __init ams_delta_init(void)
> diff --git a/drivers/input/serio/ams_delta_serio.c b/drivers/input/serio/ams_delta_serio.c
> index 2602f7cff5ae..c1f8226f172e 100644
> --- a/drivers/input/serio/ams_delta_serio.c
> +++ b/drivers/input/serio/ams_delta_serio.c
> @@ -20,7 +20,6 @@
> * However, when used with the E3 mailboard that producecs non-standard
> * scancodes, a custom key table must be prepared and loaded from userspace.
> */
> -#include <linux/gpio.h>
> #include <linux/irq.h>
> #include <linux/platform_data/ams-delta-fiq.h>
> #include <linux/platform_device.h>
> @@ -29,8 +28,6 @@
> #include <linux/slab.h>
> #include <linux/module.h>
>
> -#include <mach/board-ams-delta.h>
> -
> #define DRIVER_NAME "ams-delta-serio"
>
> MODULE_AUTHOR("Matt Callow");
> @@ -113,7 +110,7 @@ static int ams_delta_serio_init(struct platform_device *pdev)
> {
> struct ams_delta_serio *priv;
> struct serio *serio;
> - int err;
> + int irq, err;
>
> priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
> if (!priv)
> @@ -139,26 +136,20 @@ static int ams_delta_serio_init(struct platform_device *pdev)
> return err;
> }
>
> - err = request_irq(gpio_to_irq(AMS_DELTA_GPIO_PIN_KEYBRD_CLK),
> - ams_delta_serio_interrupt, IRQ_TYPE_EDGE_RISING,
> - DRIVER_NAME, priv);
> + irq = platform_get_irq(pdev, 0);
> + if (irq < 0)
> + return -ENXIO;
> +
> + err = devm_request_irq(&pdev->dev, irq, ams_delta_serio_interrupt,
> + IRQ_TYPE_EDGE_RISING, DRIVER_NAME, priv);
> if (err < 0) {
> dev_err(&pdev->dev, "IRQ request failed (%d)\n", err);
> return err;
> }
> - /*
> - * Since GPIO register handling for keyboard clock pin is performed
> - * at FIQ level, switch back from edge to simple interrupt handler
> - * to avoid bad interaction.
> - */
> - irq_set_handler(gpio_to_irq(AMS_DELTA_GPIO_PIN_KEYBRD_CLK),
> - handle_simple_irq);
>
> serio = kzalloc(sizeof(*serio), GFP_KERNEL);
> - if (!serio) {
> - err = -ENOMEM;
> - goto irq;
> - }
> + if (!serio)
> + return -ENOMEM;
>
> priv->serio = serio;
>
> @@ -177,10 +168,6 @@ static int ams_delta_serio_init(struct platform_device *pdev)
> dev_info(&serio->dev, "%s\n", serio->name);
>
> return 0;
> -
> -irq:
> - free_irq(gpio_to_irq(AMS_DELTA_GPIO_PIN_KEYBRD_CLK), priv);
> - return err;
> }
>
> static int ams_delta_serio_exit(struct platform_device *pdev)
> @@ -188,7 +175,6 @@ static int ams_delta_serio_exit(struct platform_device *pdev)
> struct ams_delta_serio *priv = platform_get_drvdata(pdev);
>
> serio_unregister_port(priv->serio);
> - free_irq(gpio_to_irq(AMS_DELTA_GPIO_PIN_KEYBRD_CLK), 0);
>
> return 0;
> }
> --
> 2.16.4
>
--
Dmitry
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