mfd: Add initial WM8994 support

The WM8994 is a highly integrated ultra low power audio hub CODEC.
Since it includes on-board regulators and GPIOs it is represented
as a multi-function device, though the overwhelming majority of
the functionality is provided by the ASoC CODEC driver.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/mfd/Kconfig

@@ -295,6 +295,18 @@ config MFD_WM8350_I2C
 	  I2C as the control interface.  Additional options must be
 	  selected to enable support for the functionality of the chip.
 
+config MFD_WM8994
+	tristate "Support Wolfson Microelectronics WM8994"
+	select MFD_CORE
+	depends on I2C
+	help
+	  The WM8994 is a highly integrated hi-fi CODEC designed for
+	  smartphone applicatiosn.  As well as audio functionality it
+	  has on board GPIO and regulator functionality which is
+	  supported via the relevant subsystems.  This driver provides
+	  core support for the WM8994, in order to use the actual
+	  functionaltiy of the device other drivers must be enabled.
+
 config MFD_PCF50633
 	tristate "Support for NXP PCF50633"
 	depends on I2C

drivers/mfd/Makefile

@@ -25,6 +25,7 @@ wm8350-objs			:= wm8350-core.o wm8350-regmap.o wm8350-gpio.o
 wm8350-objs			+= wm8350-irq.o
 obj-$(CONFIG_MFD_WM8350)	+= wm8350.o
 obj-$(CONFIG_MFD_WM8350_I2C)	+= wm8350-i2c.o
+obj-$(CONFIG_MFD_WM8994)	+= wm8994-core.o
 
 obj-$(CONFIG_TPS65010)		+= tps65010.o
 obj-$(CONFIG_MENELAUS)		+= menelaus.o

include/linux/mfd/wm8994/core.h

+/*
+ * include/linux/mfd/wm8994/core.h -- Core interface for WM8994
+ *
+ * Copyright 2009 Wolfson Microelectronics PLC.
+ *
+ * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
+ *
+ *  This program is free software; you can redistribute  it and/or modify it
+ *  under  the terms of  the GNU General  Public License as published by the
+ *  Free Software Foundation;  either version 2 of the  License, or (at your
+ *  option) any later version.
+ *
+ */
+
+#ifndef __MFD_WM8994_CORE_H__
+#define __MFD_WM8994_CORE_H__
+
+struct regulator_dev;
+struct regulator_bulk_data;
+
+#define WM8994_NUM_GPIO_REGS 11
+#define WM8994_NUM_LDO_REGS 2
+
+struct wm8994 {
+	struct mutex io_lock;
+
+	struct device *dev;
+	int (*read_dev)(struct wm8994 *wm8994, unsigned short reg,
+			int bytes, void *dest);
+	int (*write_dev)(struct wm8994 *wm8994, unsigned short reg,
+			 int bytes, void *src);
+
+	void *control_data;
+
+	int gpio_base;
+
+	/* Used over suspend/resume */
+	u16 ldo_regs[WM8994_NUM_LDO_REGS];
+	u16 gpio_regs[WM8994_NUM_GPIO_REGS];
+
+	struct regulator_dev *dbvdd;
+	struct regulator_bulk_data *supplies;
+};
+
+/* Device I/O API */
+int wm8994_reg_read(struct wm8994 *wm8994, unsigned short reg);
+int wm8994_reg_write(struct wm8994 *wm8994, unsigned short reg,
+		 unsigned short val);
+int wm8994_set_bits(struct wm8994 *wm8994, unsigned short reg,
+		    unsigned short mask, unsigned short val);
+int wm8994_bulk_read(struct wm8994 *wm8994, unsigned short reg,
+		     int count, u16 *buf);
+
+#endif

include/linux/mfd/wm8994/gpio.h

+/*
+ * include/linux/mfd/wm8994/gpio.h - GPIO configuration for WM8994
+ *
+ * Copyright 2009 Wolfson Microelectronics PLC.
+ *
+ * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
+ *
+ *  This program is free software; you can redistribute  it and/or modify it
+ *  under  the terms of  the GNU General  Public License as published by the
+ *  Free Software Foundation;  either version 2 of the  License, or (at your
+ *  option) any later version.
+ *
+ */
+
+#ifndef __MFD_WM8994_GPIO_H__
+#define __MFD_WM8994_GPIO_H__
+
+#define WM8994_GPIO_MAX 11
+
+#define WM8994_GP_FN_PIN_SPECIFIC    0
+#define WM8994_GP_FN_GPIO            1
+#define WM8994_GP_FN_SDOUT           2
+#define WM8994_GP_FN_IRQ             3
+#define WM8994_GP_FN_TEMPERATURE     4
+#define WM8994_GP_FN_MICBIAS1_DET    5
+#define WM8994_GP_FN_MICBIAS1_SHORT  6
+#define WM8994_GP_FN_MICBIAS2_DET    7
+#define WM8994_GP_FN_MICBIAS2_SHORT  8
+#define WM8994_GP_FN_FLL1_LOCK       9
+#define WM8994_GP_FN_FLL2_LOCK      10
+#define WM8994_GP_FN_SRC1_LOCK      11
+#define WM8994_GP_FN_SRC2_LOCK      12
+#define WM8994_GP_FN_DRC1_ACT       13
+#define WM8994_GP_FN_DRC2_ACT       14
+#define WM8994_GP_FN_DRC3_ACT       15
+#define WM8994_GP_FN_WSEQ_STATUS    16
+#define WM8994_GP_FN_FIFO_ERROR     17
+#define WM8994_GP_FN_OPCLK          18
+
+#define WM8994_GPN_DIR                          0x8000  /* GPN_DIR */
+#define WM8994_GPN_DIR_MASK                     0x8000  /* GPN_DIR */
+#define WM8994_GPN_DIR_SHIFT                        15  /* GPN_DIR */
+#define WM8994_GPN_DIR_WIDTH                         1  /* GPN_DIR */
+#define WM8994_GPN_PU                           0x4000  /* GPN_PU */
+#define WM8994_GPN_PU_MASK                      0x4000  /* GPN_PU */
+#define WM8994_GPN_PU_SHIFT                         14  /* GPN_PU */
+#define WM8994_GPN_PU_WIDTH                          1  /* GPN_PU */
+#define WM8994_GPN_PD                           0x2000  /* GPN_PD */
+#define WM8994_GPN_PD_MASK                      0x2000  /* GPN_PD */
+#define WM8994_GPN_PD_SHIFT                         13  /* GPN_PD */
+#define WM8994_GPN_PD_WIDTH                          1  /* GPN_PD */
+#define WM8994_GPN_POL                          0x0400  /* GPN_POL */
+#define WM8994_GPN_POL_MASK                     0x0400  /* GPN_POL */
+#define WM8994_GPN_POL_SHIFT                        10  /* GPN_POL */
+#define WM8994_GPN_POL_WIDTH                         1  /* GPN_POL */
+#define WM8994_GPN_OP_CFG                       0x0200  /* GPN_OP_CFG */
+#define WM8994_GPN_OP_CFG_MASK                  0x0200  /* GPN_OP_CFG */
+#define WM8994_GPN_OP_CFG_SHIFT                      9  /* GPN_OP_CFG */
+#define WM8994_GPN_OP_CFG_WIDTH                      1  /* GPN_OP_CFG */
+#define WM8994_GPN_DB                           0x0100  /* GPN_DB */
+#define WM8994_GPN_DB_MASK                      0x0100  /* GPN_DB */
+#define WM8994_GPN_DB_SHIFT                          8  /* GPN_DB */
+#define WM8994_GPN_DB_WIDTH                          1  /* GPN_DB */
+#define WM8994_GPN_LVL                          0x0040  /* GPN_LVL */
+#define WM8994_GPN_LVL_MASK                     0x0040  /* GPN_LVL */
+#define WM8994_GPN_LVL_SHIFT                         6  /* GPN_LVL */
+#define WM8994_GPN_LVL_WIDTH                         1  /* GPN_LVL */
+#define WM8994_GPN_FN_MASK                      0x001F  /* GPN_FN - [4:0] */
+#define WM8994_GPN_FN_SHIFT                          0  /* GPN_FN - [4:0] */
+#define WM8994_GPN_FN_WIDTH                          5  /* GPN_FN - [4:0] */
+
+#endif

include/linux/mfd/wm8994/pdata.h

+/*
+ * include/linux/mfd/wm8994/pdata.h -- Platform data for WM8994
+ *
+ * Copyright 2009 Wolfson Microelectronics PLC.
+ *
+ * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
+ *
+ *  This program is free software; you can redistribute  it and/or modify it
+ *  under  the terms of  the GNU General  Public License as published by the
+ *  Free Software Foundation;  either version 2 of the  License, or (at your
+ *  option) any later version.
+ *
+ */
+
+#ifndef __MFD_WM8994_PDATA_H__
+#define __MFD_WM8994_PDATA_H__
+
+#define WM8994_NUM_LDO   2
+#define WM8994_NUM_GPIO 11
+
+struct wm8994_ldo_pdata {
+	/** GPIOs to enable regulator, 0 or less if not available */
+	int enable;
+
+	const char *supply;
+	struct regulator_init_data *init_data;
+};
+
+#define WM8994_CONFIGURE_GPIO 0x8000
+
+#define WM8994_DRC_REGS 5
+#define WM8994_EQ_REGS  19
+
+/**
+ * DRC configurations are specified with a label and a set of register
+ * values to write (the enable bits will be ignored).  At runtime an
+ * enumerated control will be presented for each DRC block allowing
+ * the user to choose the configration to use.
+ *
+ * Configurations may be generated by hand or by using the DRC control
+ * panel provided by the WISCE - see  http://www.wolfsonmicro.com/wisce/
+ * for details.
+ */
+struct wm8994_drc_cfg {
+        const char *name;
+        u16 regs[WM8994_DRC_REGS];
+};
+
+/**
+ * ReTune Mobile configurations are specified with a label, sample
+ * rate and set of values to write (the enable bits will be ignored).
+ *
+ * Configurations are expected to be generated using the ReTune Mobile
+ * control panel in WISCE - see http://www.wolfsonmicro.com/wisce/
+ */
+struct wm8994_retune_mobile_cfg {
+        const char *name;
+        unsigned int rate;
+        u16 regs[WM8994_EQ_REGS];
+};
+
+struct wm8994_pdata {
+	int gpio_base;
+
+	/**
+	 * Default values for GPIOs if non-zero, WM8994_CONFIGURE_GPIO
+	 * can be used for all zero values.
+	 */
+	int gpio_defaults[WM8994_NUM_GPIO];
+
+	struct wm8994_ldo_pdata ldo[WM8994_NUM_LDO];
+
+
+        int num_drc_cfgs;
+        struct wm8994_drc_cfg *drc_cfgs;
+
+        int num_retune_mobile_cfgs;
+        struct wm8994_retune_mobile_cfg *retune_mobile_cfgs;
+
+        /* LINEOUT can be differential or single ended */
+        unsigned int lineout1_diff:1;
+        unsigned int lineout2_diff:1;
+
+        /* Common mode feedback */
+        unsigned int lineout1fb:1;
+        unsigned int lineout2fb:1;
+
+        /* Microphone biases: 0=0.9*AVDD1 1=0.65*AVVD1 */
+        unsigned int micbias1_lvl:1;
+        unsigned int micbias2_lvl:1;
+
+        /* Jack detect threashold levels, see datasheet for values */
+        unsigned int jd_scthr:2;
+        unsigned int jd_thr:2;
+};
+
+#endif