1 files changed, 127 insertions, 0 deletions
diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
new file mode 100644
index 000000000000..5dc172c72f0f
--- /dev/null
+++ b/include/linux/gpio/driver.h
@@ -0,0 +1,127 @@
+#ifndef __LINUX_GPIO_DRIVER_H
+#define __LINUX_GPIO_DRIVER_H
+#include <linux/types.h>
+struct device;
+struct gpio_desc;
+/**
+ * struct gpio_chip - abstract a GPIO controller
+ * @label: for diagnostics
+ * @dev: optional device providing the GPIOs
+ * @owner: helps prevent removal of modules exporting active GPIOs
+ * @list: links gpio_chips together for traversal
+ * @request: optional hook for chip-specific activation, such as
+ *      enabling module power and clock; may sleep
+ * @free: optional hook for chip-specific deactivation, such as
+ *      disabling module power and clock; may sleep
+ * @get_direction: returns direction for signal "offset", 0=out, 1=in,
+ *      (same as GPIOF_DIR_XXX), or negative error
+ * @direction_input: configures signal "offset" as input, or returns error
+ * @direction_output: configures signal "offset" as output, or returns error
+ * @get: returns value for signal "offset"; for output signals this
+ *      returns either the value actually sensed, or zero
+ * @set: assigns output value for signal "offset"
+ * @set_debounce: optional hook for setting debounce time for specified gpio in
+ *      interrupt triggered gpio chips
+ * @to_irq: optional hook supporting non-static gpio_to_irq() mappings;
+ *      implementation may not sleep
+ * @dbg_show: optional routine to show contents in debugfs; default code
+ *      will be used when this is omitted, but custom code can show extra
+ *      state (such as pullup/pulldown configuration).
+ * @base: identifies the first GPIO number handled by this chip; or, if
+ *      negative during registration, requests dynamic ID allocation.
+ * @ngpio: the number of GPIOs handled by this controller; the last GPIO
+ *      handled is (base + ngpio - 1).
+ * @desc: array of ngpio descriptors. Private.
+ * @can_sleep: flag must be set iff get()/set() methods sleep, as they
+ *      must while accessing GPIO expander chips over I2C or SPI
+ * @names: if set, must be an array of strings to use as alternative
+ *      names for the GPIOs in this chip. Any entry in the array
+ *      may be NULL if there is no alias for the GPIO, however the
+ *      array must be @ngpio entries long.  A name can include a single printk
+ *      format specifier for an unsigned int.  It is substituted by the actual
+ *      number of the gpio.
+ *
+ * A gpio_chip can help platforms abstract various sources of GPIOs so
+ * they can all be accessed through a common programing interface.
+ * Example sources would be SOC controllers, FPGAs, multifunction
+ * chips, dedicated GPIO expanders, and so on.
+ *
+ * Each chip controls a number of signals, identified in method calls
+ * by "offset" values in the range 0..(@ngpio - 1).  When those signals
+ * are referenced through calls like gpio_get_value(gpio), the offset
+ * is calculated by subtracting @base from the gpio number.
+ */
+struct gpio_chip {
+        const char              *label;
+        struct device           *dev;
+        struct module           *owner;
+        struct list_head        list;
+        int                     (*request)(struct gpio_chip *chip,
+                                                unsigned offset);
+        void                    (*free)(struct gpio_chip *chip,
+                                                unsigned offset);
+        int                     (*get_direction)(struct gpio_chip *chip,
+                                                unsigned offset);
+        int                     (*direction_input)(struct gpio_chip *chip,
+                                                unsigned offset);
+        int                     (*direction_output)(struct gpio_chip *chip,
+                                                unsigned offset, int value);
+        int                     (*get)(struct gpio_chip *chip,
+                                                unsigned offset);
+        void                    (*set)(struct gpio_chip *chip,
+                                                unsigned offset, int value);
+        int                     (*set_debounce)(struct gpio_chip *chip,
+                                                unsigned offset,
+                                                unsigned debounce);
+        int                     (*to_irq)(struct gpio_chip *chip,
+                                                unsigned offset);
+        void                    (*dbg_show)(struct seq_file *s,
+                                                struct gpio_chip *chip);
+        int                     base;
+        u16                     ngpio;
+        struct gpio_desc        *desc;
+        const char              *const *names;
+        unsigned                can_sleep:1;
+        unsigned                exported:1;
+#if defined(CONFIG_OF_GPIO)
+        /*
+         * If CONFIG_OF is enabled, then all GPIO controllers described in the
+         * device tree automatically may have an OF translation
+         */
+        struct device_node *of_node;
+        int of_gpio_n_cells;
+        int (*of_xlate)(struct gpio_chip *gc,
+                        const struct of_phandle_args *gpiospec, u32 *flags);
+#endif
+#ifdef CONFIG_PINCTRL
+        /*
+         * If CONFIG_PINCTRL is enabled, then gpio controllers can optionally
+         * describe the actual pin range which they serve in an SoC. This
+         * information would be used by pinctrl subsystem to configure
+         * corresponding pins for gpio usage.
+         */
+        struct list_head pin_ranges;
+#endif
+};
+extern const char *gpiochip_is_requested(struct gpio_chip *chip,
+                        unsigned offset);
+/* add/remove chips */
+extern int gpiochip_add(struct gpio_chip *chip);
+extern int __must_check gpiochip_remove(struct gpio_chip *chip);
+extern struct gpio_chip *gpiochip_find(void *data,
+                              int (*match)(struct gpio_chip *chip, void *data));
+/* lock/unlock as IRQ */
+int gpiod_lock_as_irq(struct gpio_desc *desc);
+void gpiod_unlock_as_irq(struct gpio_desc *desc);
+#endif

diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h new file mode 100644 index 000000000000..5dc172c72f0f --- /dev/null +++ b/include/linux/gpio/driver.h
@@ -0,0 +1,127 @@
	1	#ifndef __LINUX_GPIO_DRIVER_H
	2	#define __LINUX_GPIO_DRIVER_H
	3
	4	#include <linux/types.h>
	5
	6	struct device;
	7	struct gpio_desc;
	8
	9	/**
	10	* struct gpio_chip - abstract a GPIO controller
	11	* @label: for diagnostics
	12	* @dev: optional device providing the GPIOs
	13	* @owner: helps prevent removal of modules exporting active GPIOs
	14	* @list: links gpio_chips together for traversal
	15	* @request: optional hook for chip-specific activation, such as
	16	* enabling module power and clock; may sleep
	17	* @free: optional hook for chip-specific deactivation, such as
	18	* disabling module power and clock; may sleep
	19	* @get_direction: returns direction for signal "offset", 0=out, 1=in,
	20	* (same as GPIOF_DIR_XXX), or negative error
	21	* @direction_input: configures signal "offset" as input, or returns error
	22	* @direction_output: configures signal "offset" as output, or returns error
	23	* @get: returns value for signal "offset"; for output signals this
	24	* returns either the value actually sensed, or zero
	25	* @set: assigns output value for signal "offset"
	26	* @set_debounce: optional hook for setting debounce time for specified gpio in
	27	* interrupt triggered gpio chips
	28	* @to_irq: optional hook supporting non-static gpio_to_irq() mappings;
	29	* implementation may not sleep
	30	* @dbg_show: optional routine to show contents in debugfs; default code
	31	* will be used when this is omitted, but custom code can show extra
	32	* state (such as pullup/pulldown configuration).
	33	* @base: identifies the first GPIO number handled by this chip; or, if
	34	* negative during registration, requests dynamic ID allocation.
	35	* @ngpio: the number of GPIOs handled by this controller; the last GPIO
	36	* handled is (base + ngpio - 1).
	37	* @desc: array of ngpio descriptors. Private.
	38	* @can_sleep: flag must be set iff get()/set() methods sleep, as they
	39	* must while accessing GPIO expander chips over I2C or SPI
	40	* @names: if set, must be an array of strings to use as alternative
	41	* names for the GPIOs in this chip. Any entry in the array
	42	* may be NULL if there is no alias for the GPIO, however the
	43	* array must be @ngpio entries long. A name can include a single printk
	44	* format specifier for an unsigned int. It is substituted by the actual
	45	* number of the gpio.
	46	*
	47	* A gpio_chip can help platforms abstract various sources of GPIOs so
	48	* they can all be accessed through a common programing interface.
	49	* Example sources would be SOC controllers, FPGAs, multifunction
	50	* chips, dedicated GPIO expanders, and so on.
	51	*
	52	* Each chip controls a number of signals, identified in method calls
	53	* by "offset" values in the range 0..(@ngpio - 1). When those signals
	54	* are referenced through calls like gpio_get_value(gpio), the offset
	55	* is calculated by subtracting @base from the gpio number.
	56	*/
	57	struct gpio_chip {
	58	const char *label;
	59	struct device *dev;
	60	struct module *owner;
	61	struct list_head list;
	62
	63	int (request)(struct gpio_chip chip,
	64	unsigned offset);
	65	void (free)(struct gpio_chip chip,
	66	unsigned offset);
	67	int (get_direction)(struct gpio_chip chip,
	68	unsigned offset);
	69	int (direction_input)(struct gpio_chip chip,
	70	unsigned offset);
	71	int (direction_output)(struct gpio_chip chip,
	72	unsigned offset, int value);
	73	int (get)(struct gpio_chip chip,
	74	unsigned offset);
	75	void (set)(struct gpio_chip chip,
	76	unsigned offset, int value);
	77	int (set_debounce)(struct gpio_chip chip,
	78	unsigned offset,
	79	unsigned debounce);
	80
	81	int (to_irq)(struct gpio_chip chip,
	82	unsigned offset);
	83
	84	void (dbg_show)(struct seq_file s,
	85	struct gpio_chip *chip);
	86	int base;
	87	u16 ngpio;
	88	struct gpio_desc *desc;
	89	const char const names;
	90	unsigned can_sleep:1;
	91	unsigned exported:1;
	92
	93	#if defined(CONFIG_OF_GPIO)
	94	/*
	95	* If CONFIG_OF is enabled, then all GPIO controllers described in the
	96	* device tree automatically may have an OF translation
	97	*/
	98	struct device_node *of_node;
	99	int of_gpio_n_cells;
	100	int (of_xlate)(struct gpio_chip gc,
	101	const struct of_phandle_args gpiospec, u32 flags);
	102	#endif
	103	#ifdef CONFIG_PINCTRL
	104	/*
	105	* If CONFIG_PINCTRL is enabled, then gpio controllers can optionally
	106	* describe the actual pin range which they serve in an SoC. This
	107	* information would be used by pinctrl subsystem to configure
	108	* corresponding pins for gpio usage.
	109	*/
	110	struct list_head pin_ranges;
	111	#endif
	112	};
	113
	114	extern const char gpiochip_is_requested(struct gpio_chip chip,
	115	unsigned offset);
	116
	117	/* add/remove chips */
	118	extern int gpiochip_add(struct gpio_chip *chip);
	119	extern int __must_check gpiochip_remove(struct gpio_chip *chip);
	120	extern struct gpio_chip gpiochip_find(void data,
	121	int (match)(struct gpio_chip chip, void *data));
	122
	123	/* lock/unlock as IRQ */
	124	int gpiod_lock_as_irq(struct gpio_desc *desc);
	125	void gpiod_unlock_as_irq(struct gpio_desc *desc);
	126
	127	#endif