Added missing tegra files.HEADmaster

1 files changed, 188 insertions, 0 deletions

diff --git a/drivers/staging/iio/trigger.h b/drivers/staging/iio/trigger.h
new file mode 100644
index 00000000000..e0b58ed749b
--- /dev/null
+++ b/drivers/staging/iio/trigger.h
@@ -0,0 +1,188 @@
+/* The industrial I/O core, trigger handling functions
+ *
+ * Copyright (c) 2008 Jonathan Cameron
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+#include <linux/irq.h>
+
+#ifndef _IIO_TRIGGER_H_
+#define _IIO_TRIGGER_H_
+
+struct iio_subirq {
+        bool enabled;
+};
+
+/**
+ * struct iio_trigger - industrial I/O trigger device
+ *
+ * @id:                 [INTERN] unique id number
+ * @name:               [DRIVER] unique name
+ * @dev:                [DRIVER] associated device (if relevant)
+ * @private_data:       [DRIVER] device specific data
+ * @list:               [INTERN] used in maintenance of global trigger list
+ * @alloc_list:         [DRIVER] used for driver specific trigger list
+ * @owner:              [DRIVER] used to monitor usage count of the trigger.
+ * @use_count:          use count for the trigger
+ * @set_trigger_state:  [DRIVER] switch on/off the trigger on demand
+ * @try_reenable:       function to reenable the trigger when the
+ *                      use count is zero (may be NULL)
+ * @validate_device:    function to validate the device when the
+ *                      current trigger gets changed.
+ * @subirq_chip:        [INTERN] associate 'virtual' irq chip.
+ * @subirq_base:        [INTERN] base number for irqs provided by trigger.
+ * @subirqs:            [INTERN] information about the 'child' irqs.
+ * @pool:               [INTERN] bitmap of irqs currently in use.
+ * @pool_lock:          [INTERN] protection of the irq pool.
+ **/
+struct iio_trigger {
+        int                             id;
+        const char                      *name;
+        struct device                   dev;
+
+        void                            *private_data;
+        struct list_head                list;
+        struct list_head                alloc_list;
+        struct module                   *owner;
+        int use_count;
+
+        int (*set_trigger_state)(struct iio_trigger *trig, bool state);
+        int (*try_reenable)(struct iio_trigger *trig);
+        int (*validate_device)(struct iio_trigger *trig,
+                               struct iio_dev *indio_dev);
+
+        struct irq_chip                 subirq_chip;
+        int                             subirq_base;
+
+        struct iio_subirq subirqs[CONFIG_IIO_CONSUMERS_PER_TRIGGER];
+        unsigned long pool[BITS_TO_LONGS(CONFIG_IIO_CONSUMERS_PER_TRIGGER)];
+        struct mutex                    pool_lock;
+};
+
+/**
+ * struct iio_poll_func - poll function pair
+ *
+ * @private_data:               data specific to device (passed into poll func)
+ * @h:                          the function that is actually run on trigger
+ * @thread:                     threaded interrupt part
+ * @type:                       the type of interrupt (basically if oneshot)
+ * @name:                       name used to identify the trigger consumer.
+ * @irq:                        the corresponding irq as allocated from the
+ *                              trigger pool
+ * @timestamp:                  some devices need a timestamp grabbed as soon
+ *                              as possible after the trigger - hence handler
+ *                              passes it via here.
+ **/
+struct iio_poll_func {
+        void                            *private_data;
+        irqreturn_t (*h)(int irq, void *p);
+        irqreturn_t (*thread)(int irq, void *p);
+        int type;
+        char *name;
+        int irq;
+        s64 timestamp;
+};
+
+static inline struct iio_trigger *to_iio_trigger(struct device *d)
+{
+        return container_of(d, struct iio_trigger, dev);
+};
+
+static inline void iio_put_trigger(struct iio_trigger *trig)
+{
+        put_device(&trig->dev);
+        module_put(trig->owner);
+};
+
+static inline void iio_get_trigger(struct iio_trigger *trig)
+{
+        __module_get(trig->owner);
+        get_device(&trig->dev);
+};
+
+/**
+ * iio_trigger_register() - register a trigger with the IIO core
+ * @trig_info:  trigger to be registered
+ **/
+int iio_trigger_register(struct iio_trigger *trig_info);
+
+/**
+ * iio_trigger_unregister() - unregister a trigger from the core
+ * @trig_info:  trigger to be unregistered
+ **/
+void iio_trigger_unregister(struct iio_trigger *trig_info);
+
+/**
+ * iio_trigger_attach_poll_func() - add a function pair to be run on trigger
+ * @trig:       trigger to which the function pair are being added
+ * @pf:         poll function pair
+ **/
+int iio_trigger_attach_poll_func(struct iio_trigger *trig,
+                                 struct iio_poll_func *pf);
+
+/**
+ * iio_trigger_dettach_poll_func() -    remove function pair from those to be
+ *                                      run on trigger
+ * @trig:       trigger from which the function is being removed
+ * @pf:         poll function pair
+ **/
+int iio_trigger_dettach_poll_func(struct iio_trigger *trig,
+                                  struct iio_poll_func *pf);
+
+/**
+ * iio_trigger_poll() - called on a trigger occurring
+ * @trig: trigger which occurred
+ *
+ * Typically called in relevant hardware interrupt handler.
+ **/
+void iio_trigger_poll(struct iio_trigger *trig, s64 time);
+void iio_trigger_poll_chained(struct iio_trigger *trig, s64 time);
+void iio_trigger_notify_done(struct iio_trigger *trig);
+
+irqreturn_t iio_trigger_generic_data_rdy_poll(int irq, void *private);
+
+static inline int iio_trigger_get_irq(struct iio_trigger *trig)
+{
+        int ret;
+        mutex_lock(&trig->pool_lock);
+        ret = bitmap_find_free_region(trig->pool,
+                                      CONFIG_IIO_CONSUMERS_PER_TRIGGER,
+                                      ilog2(1));
+        mutex_unlock(&trig->pool_lock);
+        if (ret >= 0)
+                ret += trig->subirq_base;
+
+        return ret;
+};
+
+static inline void iio_trigger_put_irq(struct iio_trigger *trig, int irq)
+{
+        mutex_lock(&trig->pool_lock);
+        clear_bit(irq - trig->subirq_base, trig->pool);
+        mutex_unlock(&trig->pool_lock);
+};
+
+struct iio_poll_func
+*iio_alloc_pollfunc(irqreturn_t (*h)(int irq, void *p),
+                    irqreturn_t (*thread)(int irq, void *p),
+                    int type,
+                    void *private,
+                    const char *fmt,
+                    ...);
+void iio_dealloc_pollfunc(struct iio_poll_func *pf);
+irqreturn_t iio_pollfunc_store_time(int irq, void *p);
+
+/*
+ * Two functions for common case where all that happens is a pollfunc
+ * is attached and detached from a trigger
+ */
+int iio_triggered_ring_postenable(struct iio_dev *indio_dev);
+int iio_triggered_ring_predisable(struct iio_dev *indio_dev);
+
+struct iio_trigger *iio_allocate_trigger(const char *fmt, ...)
+        __attribute__((format(printf, 1, 2)));
+void iio_free_trigger(struct iio_trigger *trig);
+
+#endif /* _IIO_TRIGGER_H_ */