From 21abf103818a4735e80fb0ab03934bed8ae9a028 Mon Sep 17 00:00:00 2001 From: Linus Walleij Date: Tue, 4 Sep 2018 13:31:45 +0200 Subject: gpio: Pass a flag to gpiochip_request_own_desc() Before things go out of hand, make it possible to pass flags when requesting "own" descriptors from a gpio_chip. This is necessary if the chip wants to request a GPIO with active low semantics, for example. Cc: Janusz Krzysztofik Cc: Thomas Petazzoni Cc: Jason Cooper Cc: Jiri Kosina Cc: Roger Quadros Reviewed-by: Gregory CLEMENT Signed-off-by: Linus Walleij --- drivers/gpio/gpio-mvebu.c | 2 +- drivers/gpio/gpiolib-acpi.c | 13 +++---------- drivers/gpio/gpiolib.c | 21 +++++++++++++++++++-- 3 files changed, 23 insertions(+), 13 deletions(-) (limited to 'drivers/gpio') diff --git a/drivers/gpio/gpio-mvebu.c b/drivers/gpio/gpio-mvebu.c index 6e02148c208b..6c675c5accba 100644 --- a/drivers/gpio/gpio-mvebu.c +++ b/drivers/gpio/gpio-mvebu.c @@ -608,7 +608,7 @@ static int mvebu_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm) ret = -EBUSY; } else { desc = gpiochip_request_own_desc(&mvchip->chip, - pwm->hwpwm, "mvebu-pwm"); + pwm->hwpwm, "mvebu-pwm", 0); if (IS_ERR(desc)) { ret = PTR_ERR(desc); goto out; diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c index 55b72fbe1631..722a9befa8a9 100644 --- a/drivers/gpio/gpiolib-acpi.c +++ b/drivers/gpio/gpiolib-acpi.c @@ -167,7 +167,7 @@ static acpi_status acpi_gpiochip_request_interrupt(struct acpi_resource *ares, if (!handler) return AE_OK; - desc = gpiochip_request_own_desc(chip, pin, "ACPI:Event"); + desc = gpiochip_request_own_desc(chip, pin, "ACPI:Event", 0); if (IS_ERR(desc)) { dev_err(chip->parent, "Failed to request GPIO\n"); return AE_ERROR; @@ -884,21 +884,14 @@ acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address, const char *label = "ACPI:OpRegion"; int err; - desc = gpiochip_request_own_desc(chip, pin, label); + desc = gpiochip_request_own_desc(chip, pin, label, + flags); if (IS_ERR(desc)) { status = AE_ERROR; mutex_unlock(&achip->conn_lock); goto out; } - err = gpiod_configure_flags(desc, label, 0, flags); - if (err < 0) { - status = AE_NOT_CONFIGURED; - gpiochip_free_own_desc(desc); - mutex_unlock(&achip->conn_lock); - goto out; - } - conn = kzalloc(sizeof(*conn), GFP_KERNEL); if (!conn) { status = AE_NO_MEMORY; diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index d61fdcb26fbd..2ec8b0d2096a 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -2454,6 +2454,7 @@ EXPORT_SYMBOL_GPL(gpiochip_is_requested); * @chip: GPIO chip * @hwnum: hardware number of the GPIO for which to request the descriptor * @label: label for the GPIO + * @flags: flags for this GPIO or 0 if default * * Function allows GPIO chip drivers to request and use their own GPIO * descriptors via gpiolib API. Difference to gpiod_request() is that this @@ -2466,7 +2467,8 @@ EXPORT_SYMBOL_GPL(gpiochip_is_requested); * code on failure. */ struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *chip, u16 hwnum, - const char *label) + const char *label, + enum gpiod_flags flags) { struct gpio_desc *desc = gpiochip_get_desc(chip, hwnum); int err; @@ -2480,6 +2482,13 @@ struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *chip, u16 hwnum, if (err < 0) return ERR_PTR(err); + err = gpiod_configure_flags(desc, label, 0, flags); + if (err) { + chip_err(chip, "setup of own GPIO %s failed\n", label); + gpiod_free_commit(desc); + return ERR_PTR(err); + } + return desc; } EXPORT_SYMBOL_GPL(gpiochip_request_own_desc); @@ -4332,7 +4341,15 @@ int gpiod_hog(struct gpio_desc *desc, const char *name, chip = gpiod_to_chip(desc); hwnum = gpio_chip_hwgpio(desc); - local_desc = gpiochip_request_own_desc(chip, hwnum, name); + /* + * FIXME: not very elegant that we call gpiod_configure_flags() + * twice here (once inside gpiochip_request_own_desc() and + * again here), but the gpiochip_request_own_desc() is external + * and cannot really pass the lflags so this is the lesser evil + * at the moment. Pass zero as dflags on this first call so we + * don't screw anything up. + */ + local_desc = gpiochip_request_own_desc(chip, hwnum, name, 0); if (IS_ERR(local_desc)) { status = PTR_ERR(local_desc); pr_err("requesting hog GPIO %s (chip %s, offset %d) failed, %d\n", -- cgit v1.2.3-59-g8ed1b