[PATCH] irq: Add function pointer table for generic-chip

[Nobuhiro Iwamatsu]

This adds the function table to access it with function pointer
by some functions providedd in generic-chip.
The driver who uses the function offered in generic-chip can use
this via this function table.

For example, driver is used as follows.
...
chip.irq_ack = &irq_gc_function_tbl.ack_set_bit;
chip.irq_mask = &irq_gc_function_tbl.mask_clr_bit;
...

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@xxxxxxxxxxx>
---
 include/linux/irq.h       |   16 ++++++++++++++++
 kernel/irq/generic-chip.c |   18 ++++++++++++++++++
 2 files changed, 34 insertions(+), 0 deletions(-)

diff --git a/include/linux/irq.h b/include/linux/irq.h
index bff29c5..8b271cc 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -700,6 +700,22 @@ void irq_gc_mask_disable_reg_and_ack(struct irq_data *d);
 void irq_gc_eoi(struct irq_data *d);
 int irq_gc_set_wake(struct irq_data *d, unsigned int on);

+/* Generic chip callback function table */
+struct irq_gc_functions {
+	void (* noop)(struct irq_data *d);
+	void (* mask_disable_reg)(struct irq_data *d);
+	void (* mask_set_bit)(struct irq_data *d);
+	void (* mask_clr_bit)(struct irq_data *d);
+	void (* unmask_enable_reg)(struct irq_data *d);
+	void (* ack_set_bit)(struct irq_data *d);
+	void (* ack_clr_bit)(struct irq_data *d);
+	void (* mask_disable_reg_and_ack)(struct irq_data *d);
+	void (* eoi)(struct irq_data *d);
+	int (* set_wake)(struct irq_data *d, unsigned int on);
+};
+
+extern struct irq_gc_functions irq_gc_function_tbl;
+
 /* Setup functions for irq_chip_generic */
 struct irq_chip_generic *
 irq_alloc_generic_chip(const char *name, int nr_ct, unsigned int irq_base,
diff --git a/kernel/irq/generic-chip.c b/kernel/irq/generic-chip.c
index 6cb7613..03df526 100644
--- a/kernel/irq/generic-chip.c
+++ b/kernel/irq/generic-chip.c
@@ -183,6 +183,24 @@ int irq_gc_set_wake(struct irq_data *d, unsigned int on)
 }

 /**
+ * irq generic chip user needs to access irq_gc_XXX function using
+ * irq_gc_function_tbl.
+ */
+struct irq_gc_functions irq_gc_function_tbl ={
+	.noop = irq_gc_noop,
+	.mask_disable_reg = irq_gc_mask_disable_reg,
+	.mask_set_bit = irq_gc_mask_set_bit,
+	.mask_clr_bit = irq_gc_mask_clr_bit,
+	.unmask_enable_reg = irq_gc_unmask_enable_reg,
+	.ack_set_bit = irq_gc_ack_set_bit,
+	.ack_clr_bit = irq_gc_ack_clr_bit,
+	.mask_disable_reg_and_ack = irq_gc_mask_disable_reg_and_ack,
+	.eoi = irq_gc_eoi,
+	.set_wake = irq_gc_set_wake,
+};
+EXPORT_SYMBOL_GPL(irq_gc_function_tbl);
+
+/**
  * irq_alloc_generic_chip - Allocate a generic chip and initialize it
  * @name:	Name of the irq chip
  * @num_ct:	Number of irq_chip_type instances associated with this
-- 
1.7.7
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