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Message-Id: <20180609140224.32606-7-jmkrzyszt@gmail.com>
Date: Sat, 9 Jun 2018 16:02:21 +0200
From: Janusz Krzysztofik <jmkrzyszt@...il.com>
To: Dmitry Torokhov <dmitry.torokhov@...il.com>,
Tony Lindgren <tony@...mide.com>,
Aaro Koskinen <aaro.koskinen@....fi>
Cc: "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>,
Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>,
Linus Walleij <linus.walleij@...aro.org>,
linux-arm-kernel@...ts.infradead.org, linux-input@...r.kernel.org,
linux-omap@...r.kernel.org, linux-gpio@...r.kernel.org,
linux-kernel@...r.kernel.org,
Janusz Krzysztofik <jmkrzyszt@...il.com>
Subject: [PATCH 07/10] ARM: OMAP1: ams-delta FIQ: Keep serio input GPIOs requested
>From the very beginning, input GPIO pins of ams-delta serio port have
been used by FIQ handler, not serio driver.
Don't request those pins from the ams-delta-serio driver any longer,
instead keep them requested and initialized by the FIQ initialization
routine which already requests them and releases while identifying GPIO
IRQs.
Signed-off-by: Janusz Krzysztofik <jmkrzyszt@...il.com>
---
arch/arm/mach-omap1/ams-delta-fiq.c | 42 ++++++++++++++++++++++++++++++-----
drivers/input/serio/ams_delta_serio.c | 30 ++-----------------------
2 files changed, 39 insertions(+), 33 deletions(-)
diff --git a/arch/arm/mach-omap1/ams-delta-fiq.c b/arch/arm/mach-omap1/ams-delta-fiq.c
index 1d54a6177f14..5a6c59ac9b5f 100644
--- a/arch/arm/mach-omap1/ams-delta-fiq.c
+++ b/arch/arm/mach-omap1/ams-delta-fiq.c
@@ -45,6 +45,11 @@ static struct irq_chip *irq_chip;
static struct irq_data *irq_data[16];
static unsigned int irq_counter[16];
+static const char *pin_name[16] __initconst = {
+ [AMS_DELTA_GPIO_PIN_KEYBRD_DATA] = "keybrd_data",
+ [AMS_DELTA_GPIO_PIN_KEYBRD_CLK] = "keybrd_clk",
+};
+
static irqreturn_t deferred_fiq(int irq, void *dev_id)
{
struct irq_data *d;
@@ -80,7 +85,7 @@ static irqreturn_t deferred_fiq(int irq, void *dev_id)
void __init ams_delta_init_fiq(struct gpio_chip *chip)
{
- struct gpio_desc *gpiod;
+ struct gpio_desc *gpiod, *data = NULL, *clk = NULL;
void *fiqhandler_start;
unsigned int fiqhandler_length;
struct pt_regs FIQ_regs;
@@ -96,7 +101,7 @@ void __init ams_delta_init_fiq(struct gpio_chip *chip)
}
for (i = 0; i < ARRAY_SIZE(irq_data); i++) {
- gpiod = gpiochip_request_own_desc(chip, i, NULL);
+ gpiod = gpiochip_request_own_desc(chip, i, pin_name[i]);
if (IS_ERR(gpiod)) {
pr_err("%s: failed to get GPIO pin %d (%ld)\n",
__func__, i, PTR_ERR(gpiod));
@@ -105,8 +110,27 @@ void __init ams_delta_init_fiq(struct gpio_chip *chip)
/* Store irq_data location for IRQ handler use */
irq_data[i] = irq_get_irq_data(gpiod_to_irq(gpiod));
- gpiochip_free_own_desc(gpiod);
+ /*
+ * FIQ handler takes full control over serio data and clk GPIO
+ * pins. Initiaize them and keep requested so nobody can
+ * interfere. Fail if any of those two couldn't be requested.
+ */
+ switch (i) {
+ case AMS_DELTA_GPIO_PIN_KEYBRD_DATA:
+ data = gpiod;
+ gpiod_direction_input(data);
+ break;
+ case AMS_DELTA_GPIO_PIN_KEYBRD_CLK:
+ clk = gpiod;
+ gpiod_direction_input(clk);
+ break;
+ default:
+ gpiochip_free_own_desc(gpiod);
+ break;
+ }
}
+ if (!data || !clk)
+ goto out_gpio;
fiqhandler_start = &qwerty_fiqin_start;
fiqhandler_length = &qwerty_fiqin_end - &qwerty_fiqin_start;
@@ -117,7 +141,7 @@ void __init ams_delta_init_fiq(struct gpio_chip *chip)
if (retval) {
pr_err("ams_delta_init_fiq(): couldn't claim FIQ, ret=%d\n",
retval);
- return;
+ goto out_gpio;
}
retval = request_irq(INT_DEFERRED_FIQ, deferred_fiq,
@@ -125,7 +149,7 @@ void __init ams_delta_init_fiq(struct gpio_chip *chip)
if (retval < 0) {
pr_err("Failed to get deferred_fiq IRQ, ret=%d\n", retval);
release_fiq(&fh);
- return;
+ goto out_gpio;
}
/*
* Since no set_type() method is provided by OMAP irq chip,
@@ -175,4 +199,12 @@ void __init ams_delta_init_fiq(struct gpio_chip *chip)
offset = IRQ_ILR0_REG_OFFSET + (INT_GPIO_BANK1 - NR_IRQS_LEGACY) * 0x4;
val = omap_readl(OMAP_IH1_BASE + offset) | 1;
omap_writel(val, OMAP_IH1_BASE + offset);
+
+ return;
+
+out_gpio:
+ if (data)
+ gpiochip_free_own_desc(data);
+ if (clk)
+ gpiochip_free_own_desc(clk);
}
diff --git a/drivers/input/serio/ams_delta_serio.c b/drivers/input/serio/ams_delta_serio.c
index 0b4d5a952ecb..a83d8b3cd838 100644
--- a/drivers/input/serio/ams_delta_serio.c
+++ b/drivers/input/serio/ams_delta_serio.c
@@ -110,19 +110,6 @@ static void ams_delta_serio_close(struct serio *serio)
regulator_disable(priv->vcc);
}
-static const struct gpio ams_delta_gpios[] __initconst_or_module = {
- {
- .gpio = AMS_DELTA_GPIO_PIN_KEYBRD_DATA,
- .flags = GPIOF_DIR_IN,
- .label = "serio-data",
- },
- {
- .gpio = AMS_DELTA_GPIO_PIN_KEYBRD_CLK,
- .flags = GPIOF_DIR_IN,
- .label = "serio-clock",
- },
-};
-
static int ams_delta_serio_init(struct platform_device *pdev)
{
struct ams_delta_serio *priv;
@@ -133,13 +120,6 @@ static int ams_delta_serio_init(struct platform_device *pdev)
if (!priv)
return -ENOMEM;
- err = gpio_request_array(ams_delta_gpios,
- ARRAY_SIZE(ams_delta_gpios));
- if (err) {
- dev_err(&pdev->dev, "Couldn't request gpio pins\n");
- goto serio;
- }
-
priv->vcc = devm_regulator_get(&pdev->dev, "vcc");
if (IS_ERR(priv->vcc)) {
err = PTR_ERR(priv->vcc);
@@ -147,7 +127,7 @@ static int ams_delta_serio_init(struct platform_device *pdev)
/* Fail softly if the regulator is not available yet */
if (err == -ENODEV)
err = -EPROBE_DEFER;
- goto gpio;
+ return err;
}
err = request_irq(gpio_to_irq(AMS_DELTA_GPIO_PIN_KEYBRD_CLK),
@@ -155,7 +135,7 @@ static int ams_delta_serio_init(struct platform_device *pdev)
DRIVER_NAME, priv);
if (err < 0) {
dev_err(&pdev->dev, "IRQ request failed (%d)\n", err);
- goto gpio;
+ return err;
}
/*
* Since GPIO register handling for keyboard clock pin is performed
@@ -191,10 +171,6 @@ static int ams_delta_serio_init(struct platform_device *pdev)
irq:
free_irq(gpio_to_irq(AMS_DELTA_GPIO_PIN_KEYBRD_CLK), priv);
-gpio:
- gpio_free_array(ams_delta_gpios,
- ARRAY_SIZE(ams_delta_gpios));
-serio:
return err;
}
@@ -204,8 +180,6 @@ static int ams_delta_serio_exit(struct platform_device *pdev)
serio_unregister_port(priv->serio);
free_irq(gpio_to_irq(AMS_DELTA_GPIO_PIN_KEYBRD_CLK), 0);
- gpio_free_array(ams_delta_gpios,
- ARRAY_SIZE(ams_delta_gpios));
return 0;
}
--
2.16.1
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