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>

1 files changed, 72 insertions, 0 deletions

diff --git a/include/linux/mfd/pcf50633/adc.h b/include/linux/mfd/pcf50633/adc.h
new file mode 100644
index 000000000000..56669b4183ad
--- /dev/null
+++ b/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 */