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cb0451e33b
When matching the firmware node with the potential consumer, we
currently omit the con_id string. This can lead to false positives in
the unlikely case of the consumer having been assigned more than one
shared GPIO. Check the connector ID before proceeding.
Fixes: a060b8c511 ("gpiolib: implement low-level, shared GPIO support")
Link: https://lore.kernel.org/r/20251222-gpio-shared-reset-gpio-proxy-v1-2-8d4bba7d8c14@oss.qualcomm.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
74 lines
1.7 KiB
C
74 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __LINUX_GPIO_SHARED_H
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#define __LINUX_GPIO_SHARED_H
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#include <linux/cleanup.h>
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#include <linux/lockdep.h>
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#include <linux/mutex.h>
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#include <linux/spinlock.h>
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struct gpio_device;
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struct gpio_desc;
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struct device;
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#if IS_ENABLED(CONFIG_GPIO_SHARED)
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int gpio_device_setup_shared(struct gpio_device *gdev);
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void gpio_device_teardown_shared(struct gpio_device *gdev);
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int gpio_shared_add_proxy_lookup(struct device *consumer, const char *con_id,
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unsigned long lflags);
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#else
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static inline int gpio_device_setup_shared(struct gpio_device *gdev)
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{
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return 0;
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}
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static inline void gpio_device_teardown_shared(struct gpio_device *gdev) { }
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static inline int gpio_shared_add_proxy_lookup(struct device *consumer,
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const char *con_id,
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unsigned long lflags)
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{
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return 0;
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}
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#endif /* CONFIG_GPIO_SHARED */
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struct gpio_shared_desc {
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struct gpio_desc *desc;
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bool can_sleep;
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unsigned long cfg;
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unsigned int usecnt;
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unsigned int highcnt;
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union {
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struct mutex mutex;
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spinlock_t spinlock;
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};
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};
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struct gpio_shared_desc *devm_gpiod_shared_get(struct device *dev);
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DEFINE_LOCK_GUARD_1(gpio_shared_desc_lock, struct gpio_shared_desc,
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if (_T->lock->can_sleep)
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mutex_lock(&_T->lock->mutex);
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else
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spin_lock_irqsave(&_T->lock->spinlock, _T->flags),
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if (_T->lock->can_sleep)
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mutex_unlock(&_T->lock->mutex);
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else
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spin_unlock_irqrestore(&_T->lock->spinlock, _T->flags),
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unsigned long flags)
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static inline void gpio_shared_lockdep_assert(struct gpio_shared_desc *shared_desc)
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{
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if (shared_desc->can_sleep)
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lockdep_assert_held(&shared_desc->mutex);
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else
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lockdep_assert_held(&shared_desc->spinlock);
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}
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#endif /* __LINUX_GPIO_SHARED_H */
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