mfd: add U300 AB3100 core support

This adds a core driver for the AB3100 mixed-signal circuit
found in the ST-Ericsson U300 series platforms. This driver
is a singleton proxy for all accesses to the AB3100
sub-drivers which will be merged on top of this one, RTC,
regulators, battery and system power control, vibrator,
LEDs, and an ALSA codec.
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Reviewed-by: Mike Rapoport <mike@compulab.co.il>
Reviewed-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/mfd/Kconfig

@@ -241,6 +241,20 @@ config PCF50633_GPIO
 	 Say yes here if you want to include support GPIO for pins on
 	 the PCF50633 chip.
 
+config AB3100_CORE
+	tristate "ST-Ericsson AB3100 Mixed Signal Circuit core functions"
+	depends on I2C
+	default y if ARCH_U300
+	help
+	  Select this to enable the AB3100 Mixed Signal IC core
+	  functionality. This connects to a AB3100 on the I2C bus
+	  and expose a number of symbols needed for dependent devices
+	  to read and write registers and subscribe to events from
+	  this multi-functional IC. This is needed to use other features
+	  of the AB3100 such as battery-backed RTC, charging control,
+	  LEDs, vibrator, system power and temperature, power management
+	  and ALSA sound.
+
 endmenu
 
 menu "Multimedia Capabilities Port drivers"

drivers/mfd/Makefile

@@ -40,4 +40,5 @@ obj-$(CONFIG_PMIC_DA903X)	+= da903x.o
 
 obj-$(CONFIG_MFD_PCF50633)	+= pcf50633-core.o
 obj-$(CONFIG_PCF50633_ADC)	+= pcf50633-adc.o
-obj-$(CONFIG_PCF50633_GPIO)	+= pcf50633-gpio.o
+obj-$(CONFIG_PCF50633_GPIO)	+= pcf50633-gpio.o
\ No newline at end of file
+obj-$(CONFIG_AB3100_CORE)	+= ab3100-core.o

include/linux/mfd/ab3100.h

+/*
+ * Copyright (C) 2007-2009 ST-Ericsson AB
+ * License terms: GNU General Public License (GPL) version 2
+ * AB3100 core access functions
+ * Author: Linus Walleij <linus.walleij@stericsson.com>
+ */
+
+#include <linux/device.h>
+
+#ifndef MFD_AB3100_H
+#define MFD_AB3100_H
+
+#define ABUNKNOWN	0
+#define	AB3000		1
+#define	AB3100		2
+
+/*
+ * AB3100, EVENTA1, A2 and A3 event register flags
+ * these are catenated into a single 32-bit flag in the code
+ * for event notification broadcasts.
+ */
+#define AB3100_EVENTA1_ONSWA				(0x01<<16)
+#define AB3100_EVENTA1_ONSWB				(0x02<<16)
+#define AB3100_EVENTA1_ONSWC				(0x04<<16)
+#define AB3100_EVENTA1_DCIO				(0x08<<16)
+#define AB3100_EVENTA1_OVER_TEMP			(0x10<<16)
+#define AB3100_EVENTA1_SIM_OFF				(0x20<<16)
+#define AB3100_EVENTA1_VBUS				(0x40<<16)
+#define AB3100_EVENTA1_VSET_USB				(0x80<<16)
+
+#define AB3100_EVENTA2_READY_TX				(0x01<<8)
+#define AB3100_EVENTA2_READY_RX				(0x02<<8)
+#define AB3100_EVENTA2_OVERRUN_ERROR			(0x04<<8)
+#define AB3100_EVENTA2_FRAMING_ERROR			(0x08<<8)
+#define AB3100_EVENTA2_CHARG_OVERCURRENT		(0x10<<8)
+#define AB3100_EVENTA2_MIDR				(0x20<<8)
+#define AB3100_EVENTA2_BATTERY_REM			(0x40<<8)
+#define AB3100_EVENTA2_ALARM				(0x80<<8)
+
+#define AB3100_EVENTA3_ADC_TRIG5			(0x01)
+#define AB3100_EVENTA3_ADC_TRIG4			(0x02)
+#define AB3100_EVENTA3_ADC_TRIG3			(0x04)
+#define AB3100_EVENTA3_ADC_TRIG2			(0x08)
+#define AB3100_EVENTA3_ADC_TRIGVBAT			(0x10)
+#define AB3100_EVENTA3_ADC_TRIGVTX			(0x20)
+#define AB3100_EVENTA3_ADC_TRIG1			(0x40)
+#define AB3100_EVENTA3_ADC_TRIG0			(0x80)
+
+/* AB3100, STR register flags */
+#define AB3100_STR_ONSWA				(0x01)
+#define AB3100_STR_ONSWB				(0x02)
+#define AB3100_STR_ONSWC				(0x04)
+#define AB3100_STR_DCIO					(0x08)
+#define AB3100_STR_BOOT_MODE				(0x10)
+#define AB3100_STR_SIM_OFF				(0x20)
+#define AB3100_STR_BATT_REMOVAL				(0x40)
+#define AB3100_STR_VBUS					(0x80)
+
+/**
+ * struct ab3100
+ * @access_mutex: lock out concurrent accesses to the AB3100 registers
+ * @dev: pointer to the containing device
+ * @i2c_client: I2C client for this chip
+ * @testreg_client: secondary client for test registers
+ * @chip_name: name of this chip variant
+ * @chip_id: 8 bit chip ID for this chip variant
+ * @work: an event handling worker
+ * @event_subscribers: event subscribers are listed here
+ * @startup_events: a copy of the first reading of the event registers
+ * @startup_events_read: whether the first events have been read
+ *
+ * This struct is PRIVATE and devices using it should NOT
+ * access ANY fields. It is used as a token for calling the
+ * AB3100 functions.
+ */
+struct ab3100 {
+	struct mutex access_mutex;
+	struct device *dev;
+	struct i2c_client *i2c_client;
+	struct i2c_client *testreg_client;
+	char chip_name[32];
+	u8 chip_id;
+	struct work_struct work;
+	struct blocking_notifier_head event_subscribers;
+	u32 startup_events;
+	bool startup_events_read;
+};
+
+int ab3100_set_register(struct ab3100 *ab3100, u8 reg, u8 regval);
+int ab3100_get_register(struct ab3100 *ab3100, u8 reg, u8 *regval);
+int ab3100_get_register_page(struct ab3100 *ab3100,
+			     u8 first_reg, u8 *regvals, u8 numregs);
+int ab3100_mask_and_set_register(struct ab3100 *ab3100,
+				 u8 reg, u8 andmask, u8 ormask);
+u8 ab3100_get_chip_type(struct ab3100 *ab3100);
+int ab3100_event_register(struct ab3100 *ab3100,
+			  struct notifier_block *nb);
+int ab3100_event_unregister(struct ab3100 *ab3100,
+			    struct notifier_block *nb);
+int ab3100_event_registers_startup_state_get(struct ab3100 *ab3100,
+					     u32 *fatevent);
+
+#endif