gpio: move sysfs support to its own file

[firefly-linux-kernel-4.4.55.git] / drivers / gpio / gpiolib.h

diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h
index 1a4103dd38df4695a35a316d4903fabc872aaec0..98020c393eb3749b219200aadf0da2cde2b66728 100644 (file)
--- a/drivers/gpio/gpiolib.h
+++ b/drivers/gpio/gpiolib.h
@@ -51,4 +51,95 @@ void gpiochip_free_own_desc(struct gpio_desc *desc);
 struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np,
                   const char *list_name, int index, enum of_gpio_flags *flags);
 
+extern struct spinlock gpio_lock;
+extern struct list_head gpio_chips;
+
+struct gpio_desc {
+       struct gpio_chip        *chip;
+       unsigned long           flags;
+/* flag symbols are bit numbers */
+#define FLAG_REQUESTED 0
+#define FLAG_IS_OUT    1
+#define FLAG_EXPORT    2       /* protected by sysfs_lock */
+#define FLAG_SYSFS     3       /* exported via /sys/class/gpio/control */
+#define FLAG_TRIG_FALL 4       /* trigger on falling edge */
+#define FLAG_TRIG_RISE 5       /* trigger on rising edge */
+#define FLAG_ACTIVE_LOW        6       /* value has active low */
+#define FLAG_OPEN_DRAIN        7       /* Gpio is open drain type */
+#define FLAG_OPEN_SOURCE 8     /* Gpio is open source type */
+#define FLAG_USED_AS_IRQ 9     /* GPIO is connected to an IRQ */
+
+#define ID_SHIFT       16      /* add new flags before this one */
+
+#define GPIO_FLAGS_MASK                ((1 << ID_SHIFT) - 1)
+#define GPIO_TRIGGER_MASK      (BIT(FLAG_TRIG_FALL) | BIT(FLAG_TRIG_RISE))
+
+       const char              *label;
+};
+
+int gpiod_request(struct gpio_desc *desc, const char *label);
+void gpiod_free(struct gpio_desc *desc);
+
+/*
+ * Return the GPIO number of the passed descriptor relative to its chip
+ */
+static int __maybe_unused gpio_chip_hwgpio(const struct gpio_desc *desc)
+{
+       return desc - &desc->chip->desc[0];
+}
+
+/* With descriptor prefix */
+
+#define gpiod_emerg(desc, fmt, ...)                                           \
+       pr_emerg("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",\
+                ##__VA_ARGS__)
+#define gpiod_crit(desc, fmt, ...)                                            \
+       pr_crit("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
+                ##__VA_ARGS__)
+#define gpiod_err(desc, fmt, ...)                                             \
+       pr_err("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",  \
+                ##__VA_ARGS__)
+#define gpiod_warn(desc, fmt, ...)                                            \
+       pr_warn("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
+                ##__VA_ARGS__)
+#define gpiod_info(desc, fmt, ...)                                            \
+       pr_info("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
+                ##__VA_ARGS__)
+#define gpiod_dbg(desc, fmt, ...)                                             \
+       pr_debug("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",\
+                ##__VA_ARGS__)
+
+/* With chip prefix */
+
+#define chip_emerg(chip, fmt, ...)                                     \
+       pr_emerg("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
+#define chip_crit(chip, fmt, ...)                                      \
+       pr_crit("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
+#define chip_err(chip, fmt, ...)                                       \
+       pr_err("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
+#define chip_warn(chip, fmt, ...)                                      \
+       pr_warn("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
+#define chip_info(chip, fmt, ...)                                      \
+       pr_info("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
+#define chip_dbg(chip, fmt, ...)                                       \
+       pr_debug("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
+
+#ifdef CONFIG_GPIO_SYSFS
+
+int gpiochip_export(struct gpio_chip *chip);
+void gpiochip_unexport(struct gpio_chip *chip);
+
+#else
+
+static inline int gpiochip_export(struct gpio_chip *chip)
+{
+       return 0;
+}
+
+static inline void gpiochip_unexport(struct gpio_chip *chip)
+{
+}
+
+#endif /* CONFIG_GPIO_SYSFS */
+
 #endif /* GPIOLIB_H */