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gpiolib: provide gpiod_remove_hogs()
Currently all users of gpiod_add_hogs() call it only once at system init so there never was any need for a mechanism allowing to remove them. Now the upcoming gpio-sim will need to tear down chips with hogged lines so provide a function that allows to remove hogs. Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Linus Walleij <linus.walleij@linaro.org>
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2 changed files with 13 additions and 0 deletions
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@ -3557,6 +3557,17 @@ void gpiod_add_hogs(struct gpiod_hog *hogs)
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}
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EXPORT_SYMBOL_GPL(gpiod_add_hogs);
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void gpiod_remove_hogs(struct gpiod_hog *hogs)
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{
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struct gpiod_hog *hog;
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mutex_lock(&gpio_machine_hogs_mutex);
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for (hog = &hogs[0]; hog->chip_label; hog++)
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list_del(&hog->list);
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mutex_unlock(&gpio_machine_hogs_mutex);
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}
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EXPORT_SYMBOL_GPL(gpiod_remove_hogs);
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static struct gpiod_lookup_table *gpiod_find_lookup_table(struct device *dev)
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{
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const char *dev_id = dev ? dev_name(dev) : NULL;
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@ -100,6 +100,7 @@ void gpiod_add_lookup_table(struct gpiod_lookup_table *table);
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void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n);
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void gpiod_remove_lookup_table(struct gpiod_lookup_table *table);
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void gpiod_add_hogs(struct gpiod_hog *hogs);
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void gpiod_remove_hogs(struct gpiod_hog *hogs);
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#else /* ! CONFIG_GPIOLIB */
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static inline
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void gpiod_add_lookup_table(struct gpiod_lookup_table *table) {}
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@ -108,6 +109,7 @@ void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n) {}
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static inline
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void gpiod_remove_lookup_table(struct gpiod_lookup_table *table) {}
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static inline void gpiod_add_hogs(struct gpiod_hog *hogs) {}
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static inline void gpiod_remove_hogs(struct gpiod_hog *hogs) {}
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#endif /* CONFIG_GPIOLIB */
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#endif /* __LINUX_GPIO_MACHINE_H */
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