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gpio: pass lookup and descriptor flags to request_own

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When a gpio_chip wants to request a descriptor from itself
using gpiochip_request_own_desc() it needs to be able to specify
fully how to use the descriptor, notably line inversion
semantics. The workaround in the gpiolib.c can be removed
and cases (such as SPI CS) where we need at times to request
a GPIO with line inversion semantics directly on a chip for
workarounds, can be fully supported with this call.

Fix up some users of the API that weren't really using the
last flag to set up the line as input or output properly
but instead just calling direction setting explicitly
after requesting the line.

Cc: Martin Sperl <kernel@martin.sperl.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Linus Walleij 2019-04-26 14:40:18 +02:00
parent 0aa3ebffc4
commit 5923ea6c2c
8 changed files with 34 additions and 38 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/arm/mach-omap1/ams-delta-fiq.c
View File

@ -14,6 +14,7 @@
* the Free Software Foundation.
*/
#include <linux/gpio/consumer.h>
#include <linux/gpio/machine.h>
#include <linux/gpio/driver.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
@ -102,7 +103,8 @@ 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], 0);
gpiod = gpiochip_request_own_desc(chip, i, pin_name[i],
GPIO_ACTIVE_HIGH, GPIOD_IN);
if (IS_ERR(gpiod)) {
pr_err("%s: failed to get GPIO pin %d (%ld)\n",
__func__, i, PTR_ERR(gpiod));

5
arch/arm/mach-omap1/board-ams-delta.c
View File

@ -13,6 +13,7 @@
*/
#include <linux/gpio/driver.h>
#include <linux/gpio/machine.h>
#include <linux/gpio/consumer.h>
#include <linux/gpio.h>
#include <linux/kernel.h>
#include <linux/init.h>
@ -609,12 +610,12 @@ static void __init modem_assign_irq(struct gpio_chip *chip)
struct gpio_desc *gpiod;
gpiod = gpiochip_request_own_desc(chip, AMS_DELTA_GPIO_PIN_MODEM_IRQ,
"modem_irq", 0);
"modem_irq", GPIO_ACTIVE_HIGH,
GPIOD_IN);
if (IS_ERR(gpiod)) {
pr_err("%s: modem IRQ GPIO request failed (%ld)\n", __func__,
PTR_ERR(gpiod));
} else {
gpiod_direction_input(gpiod);
ams_delta_modem_ports[0].irq = gpiod_to_irq(gpiod);
}
}

11
drivers/gpio/gpio-mvebu.c
View File

@ -38,6 +38,7 @@
#include <linux/err.h>
#include <linux/gpio/driver.h>
#include <linux/gpio/consumer.h>
#include <linux/gpio/machine.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/irq.h>
@ -618,18 +619,14 @@ 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", 0);
pwm->hwpwm, "mvebu-pwm",
GPIO_ACTIVE_HIGH,
GPIOD_OUT_LOW);
if (IS_ERR(desc)) {
ret = PTR_ERR(desc);
goto out;
}
ret = gpiod_direction_output(desc, 0);
if (ret) {
gpiochip_free_own_desc(desc);
goto out;
}
mvpwm->gpiod = desc;
}
out:

6
drivers/gpio/gpiolib-acpi.c
View File

@ -217,14 +217,13 @@ static acpi_status acpi_gpiochip_alloc_event(struct acpi_resource *ares,
if (!handler)
return AE_OK;
desc = gpiochip_request_own_desc(chip, pin, "ACPI:Event", 0);
desc = gpiochip_request_own_desc(chip, pin, "ACPI:Event",
GPIO_ACTIVE_HIGH, GPIOD_IN);
if (IS_ERR(desc)) {
dev_err(chip->parent, "Failed to request GPIO\n");
return AE_ERROR;
}
gpiod_direction_input(desc);
ret = gpiochip_lock_as_irq(chip, pin);
if (ret) {
dev_err(chip->parent, "Failed to lock GPIO as interrupt\n");
@ -951,6 +950,7 @@ acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,
const char *label = "ACPI:OpRegion";
desc = gpiochip_request_own_desc(chip, pin, label,
GPIO_ACTIVE_HIGH,
flags);
if (IS_ERR(desc)) {
status = AE_ERROR;

31
drivers/gpio/gpiolib.c
View File

@ -2503,7 +2503,11 @@ 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
* @lflags: lookup flags for this GPIO or 0 if default, this can be used to
* specify things like line inversion semantics with the machine flags
* such as GPIO_OUT_LOW
* @dflags: descriptor request flags for this GPIO or 0 if default, this
* can be used to specify consumer semantics such as open drain
*
* Function allows GPIO chip drivers to request and use their own GPIO
* descriptors via gpiolib API. Difference to gpiod_request() is that this
@ -2517,9 +2521,9 @@ EXPORT_SYMBOL_GPL(gpiochip_is_requested);
*/
struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *chip, u16 hwnum,
const char *label,
enum gpiod_flags flags)
enum gpio_lookup_flags lflags,
enum gpiod_flags dflags)
{
unsigned long lflags = GPIO_LOOKUP_FLAGS_DEFAULT;
struct gpio_desc *desc = gpiochip_get_desc(chip, hwnum);
int err;
@ -2532,7 +2536,7 @@ 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, lflags, flags);
err = gpiod_configure_flags(desc, label, lflags, dflags);
if (err) {
chip_err(chip, "setup of own GPIO %s failed\n", label);
gpiod_free_commit(desc);
@ -4420,15 +4424,8 @@ int gpiod_hog(struct gpio_desc *desc, const char *name,
chip = gpiod_to_chip(desc);
hwnum = gpio_chip_hwgpio(desc);
/*
* 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);
local_desc = gpiochip_request_own_desc(chip, hwnum, name,
lflags, dflags);
if (IS_ERR(local_desc)) {
status = PTR_ERR(local_desc);
pr_err("requesting hog GPIO %s (chip %s, offset %d) failed, %d\n",
@ -4436,14 +4433,6 @@ int gpiod_hog(struct gpio_desc *desc, const char *name,
return status;
}
status = gpiod_configure_flags(desc, name, lflags, dflags);
if (status < 0) {
pr_err("setup of hog GPIO %s (chip %s, offset %d) failed, %d\n",
name, chip->label, hwnum, status);
gpiochip_free_own_desc(desc);
return status;
}
/* Mark GPIO as hogged so it can be identified and removed later */
set_bit(FLAG_IS_HOGGED, &desc->flags);

7
drivers/hid/hid-cp2112.c
View File

@ -24,7 +24,8 @@
* https://www.silabs.com/documents/public/application-notes/an495-cp2112-interface-specification.pdf
*/
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/gpio/machine.h>
#include <linux/gpio/driver.h>
#include <linux/hid.h>
#include <linux/hidraw.h>
@ -1203,7 +1204,9 @@ 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", 0);
"HID/I2C:Event",
GPIO_ACTIVE_HIGH,
GPIOD_IN);
if (IS_ERR(dev->desc[pin])) {
dev_err(dev->gc.parent, "Failed to request GPIO\n");
return PTR_ERR(dev->desc[pin]);

4
drivers/memory/omap-gpmc.c
View File

@ -22,6 +22,7 @@
#include <linux/io.h>
#include <linux/gpio/driver.h>
#include <linux/gpio/consumer.h> /* GPIO descriptor enum */
#include <linux/gpio/machine.h>
#include <linux/interrupt.h>
#include <linux/irqdomain.h>
#include <linux/platform_device.h>
@ -2172,7 +2173,8 @@ static int gpmc_probe_generic_child(struct platform_device *pdev,
waitpin_desc = gpiochip_request_own_desc(&gpmc->gpio_chip,
wait_pin, "WAITPIN",
0);
GPIO_ACTIVE_HIGH,
GPIOD_IN);
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

@ -18,6 +18,7 @@ struct seq_file;
struct gpio_device;
struct module;
enum gpiod_flags;
enum gpio_lookup_flags;
#ifdef CONFIG_GPIOLIB
@ -614,7 +615,8 @@ gpiochip_remove_pin_ranges(struct gpio_chip *chip)
struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *chip, u16 hwnum,
const char *label,
enum gpiod_flags flags);
enum gpio_lookup_flags lflags,
enum gpiod_flags dflags);
void gpiochip_free_own_desc(struct gpio_desc *desc);
void devprop_gpiochip_set_names(struct gpio_chip *chip,