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path: root/drivers/gpio/gpiolib.c
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Diffstat (limited to 'drivers/gpio/gpiolib.c')
-rw-r--r--drivers/gpio/gpiolib.c129
1 files changed, 4 insertions, 125 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 7582207c92e7..412d64e93cfb 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -95,39 +95,6 @@ int desc_to_gpio(const struct gpio_desc *desc)
EXPORT_SYMBOL_GPL(desc_to_gpio);
-/* Warn when drivers omit gpio_request() calls -- legal but ill-advised
- * when setting direction, and otherwise illegal. Until board setup code
- * and drivers use explicit requests everywhere (which won't happen when
- * those calls have no teeth) we can't avoid autorequesting. This nag
- * message should motivate switching to explicit requests... so should
- * the weaker cleanup after faults, compared to gpio_request().
- *
- * NOTE: the autorequest mechanism is going away; at this point it's
- * only "legal" in the sense that (old) code using it won't break yet,
- * but instead only triggers a WARN() stack dump.
- */
-static int gpio_ensure_requested(struct gpio_desc *desc)
-{
- const struct gpio_chip *chip = desc->chip;
- const int gpio = desc_to_gpio(desc);
-
- if (WARN(test_and_set_bit(FLAG_REQUESTED, &desc->flags) == 0,
- "autorequest GPIO-%d\n", gpio)) {
- if (!try_module_get(chip->owner)) {
- gpiod_err(desc, "%s: module can't be gotten\n",
- __func__);
- clear_bit(FLAG_REQUESTED, &desc->flags);
- /* lose */
- return -EIO;
- }
- desc_set_label(desc, "[auto]");
- /* caller must chip->request() w/o spinlock */
- if (chip->request)
- return 1;
- }
- return 0;
-}
-
/**
* gpiod_to_chip - Return the GPIO chip to which a GPIO descriptor belongs
* @desc: descriptor to return the chip of
@@ -964,10 +931,8 @@ void gpiochip_free_own_desc(struct gpio_desc *desc)
*/
int gpiod_direction_input(struct gpio_desc *desc)
{
- unsigned long flags;
struct gpio_chip *chip;
int status = -EINVAL;
- int offset;
if (!desc || !desc->chip) {
pr_warn("%s: invalid GPIO\n", __func__);
@@ -982,52 +947,20 @@ int gpiod_direction_input(struct gpio_desc *desc)
return -EIO;
}
- spin_lock_irqsave(&gpio_lock, flags);
-
- status = gpio_ensure_requested(desc);
- if (status < 0)
- goto fail;
-
- /* now we know the gpio is valid and chip won't vanish */
-
- spin_unlock_irqrestore(&gpio_lock, flags);
-
- might_sleep_if(chip->can_sleep);
-
- offset = gpio_chip_hwgpio(desc);
- if (status) {
- status = chip->request(chip, offset);
- if (status < 0) {
- gpiod_dbg(desc, "%s: chip request fail, %d\n",
- __func__, status);
- /* and it's not available to anyone else ...
- * gpio_request() is the fully clean solution.
- */
- goto lose;
- }
- }
-
- status = chip->direction_input(chip, offset);
+ status = chip->direction_input(chip, gpio_chip_hwgpio(desc));
if (status == 0)
clear_bit(FLAG_IS_OUT, &desc->flags);
trace_gpio_direction(desc_to_gpio(desc), 1, status);
-lose:
- return status;
-fail:
- spin_unlock_irqrestore(&gpio_lock, flags);
- if (status)
- gpiod_dbg(desc, "%s: status %d\n", __func__, status);
+
return status;
}
EXPORT_SYMBOL_GPL(gpiod_direction_input);
static int _gpiod_direction_output_raw(struct gpio_desc *desc, int value)
{
- unsigned long flags;
struct gpio_chip *chip;
int status = -EINVAL;
- int offset;
/* GPIOs used for IRQs shall not be set as output */
if (test_bit(FLAG_USED_AS_IRQ, &desc->flags)) {
@@ -1053,42 +986,11 @@ static int _gpiod_direction_output_raw(struct gpio_desc *desc, int value)
return -EIO;
}
- spin_lock_irqsave(&gpio_lock, flags);
-
- status = gpio_ensure_requested(desc);
- if (status < 0)
- goto fail;
-
- /* now we know the gpio is valid and chip won't vanish */
-
- spin_unlock_irqrestore(&gpio_lock, flags);
-
- might_sleep_if(chip->can_sleep);
-
- offset = gpio_chip_hwgpio(desc);
- if (status) {
- status = chip->request(chip, offset);
- if (status < 0) {
- gpiod_dbg(desc, "%s: chip request fail, %d\n",
- __func__, status);
- /* and it's not available to anyone else ...
- * gpio_request() is the fully clean solution.
- */
- goto lose;
- }
- }
-
- status = chip->direction_output(chip, offset, value);
+ status = chip->direction_output(chip, gpio_chip_hwgpio(desc), value);
if (status == 0)
set_bit(FLAG_IS_OUT, &desc->flags);
trace_gpio_value(desc_to_gpio(desc), 0, value);
trace_gpio_direction(desc_to_gpio(desc), 0, status);
-lose:
- return status;
-fail:
- spin_unlock_irqrestore(&gpio_lock, flags);
- if (status)
- gpiod_dbg(desc, "%s: gpio status %d\n", __func__, status);
return status;
}
@@ -1147,10 +1049,7 @@ EXPORT_SYMBOL_GPL(gpiod_direction_output);
*/
int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce)
{
- unsigned long flags;
struct gpio_chip *chip;
- int status = -EINVAL;
- int offset;
if (!desc || !desc->chip) {
pr_warn("%s: invalid GPIO\n", __func__);
@@ -1165,27 +1064,7 @@ int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce)
return -ENOTSUPP;
}
- spin_lock_irqsave(&gpio_lock, flags);
-
- status = gpio_ensure_requested(desc);
- if (status < 0)
- goto fail;
-
- /* now we know the gpio is valid and chip won't vanish */
-
- spin_unlock_irqrestore(&gpio_lock, flags);
-
- might_sleep_if(chip->can_sleep);
-
- offset = gpio_chip_hwgpio(desc);
- return chip->set_debounce(chip, offset, debounce);
-
-fail:
- spin_unlock_irqrestore(&gpio_lock, flags);
- if (status)
- gpiod_dbg(desc, "%s: status %d\n", __func__, status);
-
- return status;
+ return chip->set_debounce(chip, gpio_chip_hwgpio(desc), debounce);
}
EXPORT_SYMBOL_GPL(gpiod_set_debounce);

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