gpiolib request/free hooks

[linux-2.6-omap-h63xx.git] / include / asm-generic / gpio.h

diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h
index a3034d20ebd5ef2f7d264b62311afa06a7ac7327..48cc5d97addfc817c8074bc84496d8dc3a00b995 100644 (file)
--- a/include/asm-generic/gpio.h
+++ b/include/asm-generic/gpio.h
@@ -2,6 +2,7 @@
 #define _ASM_GENERIC_GPIO_H
 
 #include <linux/types.h>
+#include <linux/errno.h>
 
 #ifdef CONFIG_GPIOLIB
 
@@ -13,7 +14,7 @@
  *
  * While the GPIO programming interface defines valid GPIO numbers
  * to be in the range 0..MAX_INT, this library restricts them to the
- * smaller range 0..ARCH_NR_GPIOS.
+ * smaller range 0..ARCH_NR_GPIOS-1.
  */
 
 #ifndef ARCH_NR_GPIOS
@@ -34,11 +35,17 @@ struct module;
  * @label: for diagnostics
  * @dev: optional device providing the GPIOs
  * @owner: helps prevent removal of modules exporting active GPIOs
+ * @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
  * @direction_input: configures signal "offset" as input, or returns error
  * @get: returns value for signal "offset"; for output signals this
  *     returns either the value actually sensed, or zero
  * @direction_output: configures signal "offset" as output, or returns error
  * @set: assigns output value for signal "offset"
+ * @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).
@@ -64,6 +71,11 @@ struct gpio_chip {
        struct device           *dev;
        struct module           *owner;
 
+       int                     (*request)(struct gpio_chip *chip,
+                                               unsigned offset);
+       void                    (*free)(struct gpio_chip *chip,
+                                               unsigned offset);
+
        int                     (*direction_input)(struct gpio_chip *chip,
                                                unsigned offset);
        int                     (*get)(struct gpio_chip *chip,
@@ -72,6 +84,10 @@ struct gpio_chip {
                                                unsigned offset, int value);
        void                    (*set)(struct gpio_chip *chip,
                                                unsigned offset, int value);
+
+       int                     (*to_irq)(struct gpio_chip *chip,
+                                               unsigned offset);
+
        void                    (*dbg_show)(struct seq_file *s,
                                                struct gpio_chip *chip);
        int                     base;
@@ -111,6 +127,7 @@ extern void __gpio_set_value(unsigned gpio, int value);
 
 extern int __gpio_cansleep(unsigned gpio);
 
+extern int __gpio_to_irq(unsigned gpio);
 
 #ifdef CONFIG_GPIO_SYSFS