twl4030: new-style driver conversion

More updates preparing for upstream merge of twl4030 driver:

 Basic fixes
   -	twl4030-core becomes a new-style I2C driver
   -	declare and use platform_data structure for that core
   -	stop hard-wiring the irq numbers
   -	check functionality that's really used:  I2C, not SMBus
 Cleanup:
   -	remove needless "client string"
   -	remove some fake "bool" types
   -	include catalog part numbers (TPS659{5,3,2}0)
   -	diagnostics should identify the driver!

To use this, all boards with these chips will need to declare this chip
when they declare their active I2C busses (done in a separate patch).

NOTE:  the TWL4030_IRQ_* symbols still need to vanish, along with other
global resource assignments associated with these chips.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Tony Lindgren <tony@atomide.com>

include/linux/i2c/twl4030.h

@@ -52,6 +52,17 @@
 #define TWL4030_MODULE_RTC		0x14
 #define TWL4030_MODULE_SECURED_REG	0x15
 
+struct twl4030_platform_data {
+	unsigned	irq_base, irq_end;
+
+	/* REVISIT more to come ... _nothing_ should be hard-wired */
+};
+
+/*
+ * FIXME completely stop using TWL4030_IRQ_BASE ... instead, pass the
+ * IRQ data to subsidiary devices using platform device resources.
+ */
+
 /* IRQ information-need base */
 #include <mach/irqs.h>
 /* TWL4030 interrupts */