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>

1 files changed, 103 insertions, 0 deletions

diff --git a/include/linux/mfd/ab3100.h b/include/linux/mfd/ab3100.h
new file mode 100644
index 000000000000..7a3f316e3848
--- /dev/null
+++ b/include/linux/mfd/ab3100.h
@@ -0,0 +1,103 @@
+/*
+ * 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