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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 <jmkrzyszt@gmail.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Roger Quadros <rogerq@ti.com>
Reviewed-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Linus Walleij 2018-09-04 13:31:45 +02:00
parent 67566ae474
commit 21abf10381
9 changed files with 34 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
Documentation/driver-api/gpio/driver.rst
View File

@ -434,7 +434,9 @@ try_module_get()). A GPIO driver can use the following functions instead
to request and free descriptors without being pinned to the kernel forever::
struct gpio_desc *gpiochip_request_own_desc(struct gpio_desc *desc,
const char *label)
u16 hwnum,
const char *label,
enum gpiod_flags flags)
void gpiochip_free_own_desc(struct gpio_desc *desc)

2
arch/arm/mach-omap1/ams-delta-fiq.c
View File

@ -103,7 +103,7 @@ 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, pin_name[i]);
gpiod = gpiochip_request_own_desc(chip, i, pin_name[i], 0);
if (IS_ERR(gpiod)) {
pr_err("%s: failed to get GPIO pin %d (%ld)\n",
__func__, i, PTR_ERR(gpiod));

2
arch/arm/mach-omap1/board-ams-delta.c
View File

@ -808,7 +808,7 @@ static void __init ams_delta_led_init(struct gpio_chip *chip)
int i;
for (i = LATCH1_PIN_LED_CAMERA; i < LATCH1_PIN_DOCKIT1; i++) {
gpiod = gpiochip_request_own_desc(chip, i, NULL);
gpiod = gpiochip_request_own_desc(chip, i, "camera-led", 0);
if (IS_ERR(gpiod)) {
pr_warn("%s: %s GPIO %d request failed (%ld)\n",
__func__, LATCH1_LABEL, i, PTR_ERR(gpiod));

2
drivers/gpio/gpio-mvebu.c
View File

@ -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;

13
drivers/gpio/gpiolib-acpi.c
View File

@ -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;

21
drivers/gpio/gpiolib.c
View File

@ -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",

2
drivers/hid/hid-cp2112.c
View File

@ -1203,7 +1203,7 @@ static int __maybe_unused cp2112_allocate_irq(struct cp2112_device *dev,
return -EINVAL;
dev->desc[pin] = gpiochip_request_own_desc(&dev->gc, pin,
"HID/I2C:Event");
"HID/I2C:Event", 0);
if (IS_ERR(dev->desc[pin])) {
dev_err(dev->gc.parent, "Failed to request GPIO\n");
return PTR_ERR(dev->desc[pin]);

3
drivers/memory/omap-gpmc.c
View File

@ -2170,7 +2170,8 @@ static int gpmc_probe_generic_child(struct platform_device *pdev,
unsigned int wait_pin = gpmc_s.wait_pin;
waitpin_desc = gpiochip_request_own_desc(&gpmc->gpio_chip,
wait_pin, "WAITPIN");
wait_pin, "WAITPIN",
0);
if (IS_ERR(waitpin_desc)) {
dev_err(&pdev->dev, "invalid wait-pin: %d\n", wait_pin);
ret = PTR_ERR(waitpin_desc);

4
include/linux/gpio/driver.h
View File

@ -17,6 +17,7 @@ struct device_node;
struct seq_file;
struct gpio_device;
struct module;
enum gpiod_flags;
#ifdef CONFIG_GPIOLIB
@ -604,7 +605,8 @@ gpiochip_remove_pin_ranges(struct gpio_chip *chip)
#endif /* CONFIG_PINCTRL */
struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *chip, u16 hwnum,
const char *label);
const char *label,
enum gpiod_flags flags);
void gpiochip_free_own_desc(struct gpio_desc *desc);
#else /* CONFIG_GPIOLIB */