mfd: PCF50633 adc driver

This patch adds basic support for the PCF50633 ADC. The subtractive mode
is not supported yet.

Since we don't have adc subsystem, it currently lives in drivers/mfd.

Signed-off-by: Balaji Rao <balajirrao@openmoko.org>
Cc: Andy Green <andy@openmoko.com>
Acked-by: Jonathan Cameron <jonathan.cameron@gmail.com>
Signed-off-by: Samuel Ortiz <sameo@openedhand.com>

include/linux/mfd/pcf50633/adc.h

@@ -0,0 +1,72 @@
+/*
+ * adc.h  -- Driver for NXP PCF50633 ADC
+ *
+ * (C) 2006-2008 by Openmoko, Inc.
+ * All rights reserved.
+ *
+ * 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 __LINUX_MFD_PCF50633_ADC_H
+#define __LINUX_MFD_PCF50633_ADC_H
+
+#include <linux/mfd/pcf50633/core.h>
+#include <linux/platform_device.h>
+
+/* ADC Registers */
+#define PCF50633_REG_ADCC3		0x52
+#define PCF50633_REG_ADCC2		0x53
+#define PCF50633_REG_ADCC1		0x54
+#define PCF50633_REG_ADCS1		0x55
+#define PCF50633_REG_ADCS2		0x56
+#define PCF50633_REG_ADCS3		0x57
+
+#define PCF50633_ADCC1_ADCSTART		0x01
+#define PCF50633_ADCC1_RES_10BIT	0x02
+#define PCF50633_ADCC1_AVERAGE_NO	0x00
+#define PCF50633_ADCC1_AVERAGE_4	0x04
+#define PCF50633_ADCC1_AVERAGE_8	0x08
+#define PCF50633_ADCC1_AVERAGE_16	0x0c
+#define PCF50633_ADCC1_MUX_BATSNS_RES	0x00
+#define PCF50633_ADCC1_MUX_BATSNS_SUBTR	0x10
+#define PCF50633_ADCC1_MUX_ADCIN2_RES	0x20
+#define PCF50633_ADCC1_MUX_ADCIN2_SUBTR	0x30
+#define PCF50633_ADCC1_MUX_BATTEMP	0x60
+#define PCF50633_ADCC1_MUX_ADCIN1	0x70
+#define PCF50633_ADCC1_AVERAGE_MASK	0x0c
+#define PCF50633_ADCC1_ADCMUX_MASK	0xf0
+
+#define PCF50633_ADCC2_RATIO_NONE	0x00
+#define PCF50633_ADCC2_RATIO_BATTEMP	0x01
+#define PCF50633_ADCC2_RATIO_ADCIN1	0x02
+#define PCF50633_ADCC2_RATIO_BOTH	0x03
+#define PCF50633_ADCC2_RATIOSETTL_100US 0x04
+
+#define PCF50633_ADCC3_ACCSW_EN		0x01
+#define PCF50633_ADCC3_NTCSW_EN		0x04
+#define PCF50633_ADCC3_RES_DIV_TWO	0x10
+#define PCF50633_ADCC3_RES_DIV_THREE	0x00
+
+#define PCF50633_ADCS3_REF_NTCSW	0x00
+#define PCF50633_ADCS3_REF_ACCSW	0x10
+#define PCF50633_ADCS3_REF_2V0		0x20
+#define PCF50633_ADCS3_REF_VISA		0x30
+#define PCF50633_ADCS3_REF_2V0_2	0x70
+#define PCF50633_ADCS3_ADCRDY		0x80
+
+#define PCF50633_ADCS3_ADCDAT1L_MASK	0x03
+#define PCF50633_ADCS3_ADCDAT2L_MASK	0x0c
+#define PCF50633_ADCS3_ADCDAT2L_SHIFT	2
+#define PCF50633_ASCS3_REF_MASK		0x70
+
+extern int
+pcf50633_adc_async_read(struct pcf50633 *pcf, int mux, int avg,
+		void (*callback)(struct pcf50633 *, void *, int),
+		void *callback_param);
+extern int
+pcf50633_adc_sync_read(struct pcf50633 *pcf, int mux, int avg);
+
+#endif /* __LINUX_PCF50633_ADC_H */