[lm-sensors] [Patch 2/4] Max1363 (and similar) ADCs

[Jonathan Cameron <Jonathan.Cameron@gmail.com>]

From: Jonathan Cameron <jic23@cam.ac.uk>

Add support for a number of Maxim ADCs.
(max1361, max1362, max1363, max1364, max1136, max1136, max1137, max1138,
max1139, max1236, max1237, max11238, max1239)
Supplies direct access interfaces and a software ring buffer using a periodic
timer to provide the triggering interrupt.

Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
---
Patch depends on iio_core patch

 drivers/industrialio/Kconfig       |    2
 drivers/industrialio/Makefile      |    2
 drivers/industrialio/adc/Kconfig   |   12
 drivers/industrialio/adc/Makefile  |    4
 drivers/industrialio/adc/max1363.c | 1008 +++++++++++++++++++++++++++++++++++++
 5 files changed, 1028 insertions(+)

--- a/drivers/industrialio/Kconfig	2008-07-23 16:05:18.000000000 +0100
+++ b/drivers/industrialio/Kconfig	2008-07-23 15:44:45.000000000 +0100
@@ -16,4 +16,6 @@ config INDUSTRIALIO_PTIMER_BOARDINFO
        boolean
        default y
 
+source drivers/industrialio/adc/Kconfig
+
 endif
--- a/drivers/industrialio/Makefile	2008-07-23 16:05:18.000000000 +0100
+++ b/drivers/industrialio/Makefile	2008-07-23 16:24:31.000000000 +0100
@@ -5,3 +5,5 @@ industrialio-objs := industrialio-core.o
 
 obj-$(CONFIG_INDUSTRIALIO)	+= industrialio.o
 obj-$(CONFIG_INDUSTRIALIO_PTIMER_BOARDINFO) += industrialio_ptimer_board_info.o
+
+obj-y += adc/

--- a/drivers/industrialio/adc/Kconfig	1970-01-01 01:00:00.000000000 +0100
+++ b/drivers/industrialio/adc/Kconfig	2008-07-23 16:16:13.000000000 +0100
@@ -0,0 +1,12 @@
+#
+# ADC drivers
+#
+
+config MAX1363
+	tristate "MAXIM max1363 ADC driver"
+	help
+	  Say yes here to build support for many MAXIM i2c analog to digital
+	  convertors (ADC). (max1361, max1362, max1363, max1364, max1136,
+	  max1136, max1137, max1138, max1139, max1236, max1237, max11238,
+	  max1239) Provides direct access via sysfs and sw ring buffer using
+	  a periodic timer if available.
--- a/drivers/industrialio/adc/Makefile	1970-01-01 01:00:00.000000000 +0100
+++ b/drivers/industrialio/adc/Makefile	2008-07-23 16:16:44.000000000 +0100
@@ -0,0 +1,4 @@
+
+# Makefile for industrial I/O ADC drivers
+#
+obj-$(CONFIG_MAX1363) += max1363.o
--- a/drivers/industrialio/adc/max1363.c	1970-01-01 01:00:00.000000000 +0100
+++ b/drivers/industrialio/adc/max1363.c	2008-07-23 16:47:19.000000000 +0100
@@ -0,0 +1,1008 @@
+ /*
+ * linux/drivers/industrialio/adc/max1363.c
+ * Copyright (C) 2008 Jonathan Cameron
+ *
+ * based on linux/drivers/i2c/chips/max123x
+ * Copyright (C) 2002-2004 Stefan Eletzhofer
+ *
+ * based on linux/drivers/acron/char/pcf8583.c
+ * Copyright (C) 2000 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * max1363.c
+ */
+
+
+#include <linux/interrupt.h>
+#include <linux/gpio.h>
+#include <linux/workqueue.h>
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+
+#include <linux/sysfs.h>
+#include <linux/list.h>
+#include <linux/i2c.h>
+#include <linux/rtc.h>
+#include <linux/industrialio.h>
+#include <linux/industrialio_sysfs.h>
+
+
+#define MAX1363_SETUP_BYTE(a) ((a) | 0x80)
+
+/* see data sheets */
+/* max1363 and max1236, max1237, max1238, max1239 */
+#define MAX1363_SETUP_AIN3_IS_AIN3_REF_IS_VDD 0x00
+#define MAX1363_SETUP_AIN3_IS_REF_EXT_TO_REF 0x20
+#define MAX1363_SETUP_AIN3_IS_AIN3_REF_IS_INT 0x40
+#define MAX1363_SETUP_AIN3_IS_REF_REF_IS_INT 0x60
+#define MAX1363_SETUP_POWER_UP_INT_REF 0x10
+#define MAX1363_SETUP_POWER_DOWN_INT_REF 0x00
+
+
+#define MAX1363_SETUP_EXT_CLOCK 0x08
+#define MAX1363_SETUP_INT_CLOCK 0x00
+#define MAX1363_SETUP_UNIPOLAR 0x00
+#define MAX1363_SETUP_BIPOLAR 0x04
+#define MAX1363_SETUP_RESET 0x00
+#define MAX1363_SETUP_NORESET 0x02
+/* max1363 only - though don't care on others */
+#define MAX1363_SETUP_MONITOR_SETUP 0x01
+
+/* Specific to the max1363 */
+#define MAX1363_MON_RESET_CHAN(a) (1 << ((a) + 4))
+#define MAX1363_MON_CONV_RATE_133ksps 0
+#define MAX1363_MON_CONV_RATE_66_5ksps 0x02
+#define MAX1363_MON_CONV_RATE_33_3ksps 0x04
+#define MAX1363_MON_CONV_RATE_16_6ksps 0x06
+#define MAX1363_MON_CONV_RATE_8_3ksps 0x08
+#define MAX1363_MON_CONV_RATE_4_2ksps 0x0A
+#define MAX1363_MON_CONV_RATE_2_0ksps 0x0C
+#define MAX1363_MON_CONV_RATE_1_0ksps 0x0E
+#define MAX1363_MON_INT_ENABLE 0x01
+
+/* defined for readability reasons */
+/* All chips */
+#define MAX1363_CONFIG_BYTE(a) ((a))
+
+#define MAX1363_CONFIG_SE 0x01
+#define MAX1363_CONFIG_DE 0x00
+
+#define MAX1363_CONFIG_SCAN_TO_CS 0x00
+#define MAX1363_CONFIG_SCAN_SINGLE_8 0x20
+#define MAX1363_CONFIG_SCAN_MONITOR_MODE 0x40
+#define MAX1363_CONFIG_SCAN_SINGLE_1 0x60
+/* max123{6-9} only */
+#define MAX1236_SCAN_MID_TO_CHANNEL 0x40
+
+/* max1363 only - merely part of channel selects or don't care for others*/
+#define MAX1363_CONFIG_EN_MON_MODE_READ 0x18
+
+#define MAX1363_CHANNEL_SEL(a) ((a) << 1)
+
+/* max1363 strictly 0x06 - but doesn't matter */
+#define MAX1363_CHANNEL_SEL_MASK 0x1E
+#define MAX1363_SCAN_MASK 0x60
+#define MAX1363_SE_DE_MASK 0x01
+
+struct max1363_mode {
+	const char *name;
+	int8_t conf;
+	/* The number of values to be read in a single scan */
+	int numvals;
+};
+
+#define MAX1363_MODE_SINGLE(_num) {					\
+		.name = #_num,					\
+			.conf = MAX1363_CHANNEL_SEL(_num)		\
+			| MAX1363_CONFIG_SCAN_SINGLE_1			\
+			| MAX1363_CONFIG_SE,				\
+			.numvals = 1,					\
+			}
+
+#define MAX1363_MODE_SINGLE_TIMES_8(_num) {				\
+		.name = #_num"x8",					\
+			.conf = MAX1363_CHANNEL_SEL(_num)		\
+			| MAX1363_CONFIG_SCAN_SINGLE_8			\
+			| MAX1363_CONFIG_SE,				\
+			.numvals = 8,					\
+			}
+
+#define MAX1363_MODE_SCAN_TO_CHANNEL(_num) {			\
+		.name = "0..."#_num,					\
+			.conf = MAX1363_CHANNEL_SEL(_num)	\
+			| MAX1363_CONFIG_SCAN_TO_CS		\
+			| MAX1363_CONFIG_SE,			\
+			.numvals = _num + 1,			\
+			}
+
+
+/* note not available for max1363 hence naming */
+#define MAX1236_MODE_SCAN_MID_TO_CHANNEL(_mid, _num) {		\
+		.name = #_mid"..."#_num,			\
+			.conf =MAX1363_CHANNEL_SEL(_num)	\
+			| MAX1236_SCAN_MID_TO_CHANNEL		\
+			| MAX1363_CONFIG_SE,			\
+			.numvals = _num - _mid + 1			\
+}
+
+#define MAX1363_MODE_DIFF_SINGLE(_nump, _numm) {			\
+		.name = #_nump"-"#_numm,				\
+			.conf = MAX1363_CHANNEL_SEL(_nump)		\
+			| MAX1363_CONFIG_SCAN_SINGLE_1			\
+			| MAX1363_CONFIG_DE,				\
+			.numvals = 1,					\
+			}
+
+#define MAX1363_MODE_DIFF_SINGLE_TIMES_8(_nump, _numm) {		\
+		.name = #_nump"-"#_numm,				\
+			.conf = MAX1363_CHANNEL_SEL(_nump)		\
+			| MAX1363_CONFIG_SCAN_SINGLE_8			\
+			| MAX1363_CONFIG_DE,				\
+			.numvals = 1,					\
+			}
+
+/* Can't think how to automate naming so specify for now */
+#define MAX1363_MODE_DIFF_SCAN_TO_CHANNEL_NAMED(_name, _num, _numvals) { \
+		.name = #_name,					\
+			.conf = MAX1363_CHANNEL_SEL(_num)		\
+			| MAX1363_CONFIG_SCAN_TO_CS			\
+			| MAX1363_CONFIG_DE,				\
+			.numvals = _numvals,				\
+			}
+
+/* note only available for max1363 hence naming */
+#define MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL_NAMED(_name, _num, _numvals) { \
+		.name = #_name,					\
+			.conf =MAX1363_CHANNEL_SEL(_num)		\
+			| MAX1236_SCAN_MID_TO_CHANNEL			\
+			| MAX1363_CONFIG_SE,				\
+			.numvals = _numvals,				\
+}
+
+/* TODO: make this configurable */
+#define MAX1363_MODE_MONITOR {					\
+		.name = "monitor",				\
+			.conf = MAX1363_CHANNEL_SEL(3)		\
+			| MAX1363_CONFIG_SCAN_MONITOR_MODE	\
+			| MAX1363_CONFIG_SE,			\
+			.numvals = 10,				\
+		}
+
+/* This may seem an overly long winded way to do this, but at least it makes
+ * clear what all the various options actually do. Alternative suggestions
+ * that don't require user to have intimate knowledge of the chip welcomed.
+ */
+
+/* This must be maintained along side the max1363_mode_table below */
+enum max1363_modes {
+	/* Single read of a single channel */
+	_s0, _s1, _s2, _s3, _s4, _s5, _s6, _s7, _s8, _s9, _s10, _s11,
+	/* Eight reads of a single channel */
+	se0, se1, se2, se3, se4, se5, se6, se7, se8, se9, se10, se11,
+	/* Scan to channel */
+	s0to1, s0to2, s0to3, s0to4, s0to5, s0to6,
+	s0to7, s0to8, s0to9, s0to10, s0to11,
+	/* Differential single read */
+	d0m1, d2m3, d4m5, d6m7, d8m9, d10m11,
+	d1m0, d3m2, d5m4, d7m6, d9m8, d11m10,
+	/* Differential single read 8 times */
+	de0m1, de2m3, de4m5, de6m7, de8m9, de10m11,
+	de1m0, de3m2, de5m4, de7m6, de9m8, de11m10,
+	/* Differential scan to channel */
+	d0m1to2m3, d0m1to4m5, d0m1to6m7, d0m1to8m9, d0m1to10m11,
+	d1m0to3m2, d1m0to5m4, d1m0to7m6, d1m0to9m8, d1m0to11m10,
+	/* Scan mid to channel max123{6-9} only */
+	s2to3, s6to7, s6to8, s6to9, s6to10, s6to11,
+	/* Differential scan mid to channel */
+	s6m7to8m9, s6m7to10m11, s7m6to9m8, s7m6to11m10,
+} max1363_mode_t;
+
+
+static const struct  max1363_mode max1363_mode_table[] = {
+	MAX1363_MODE_SINGLE(0),
+	MAX1363_MODE_SINGLE(1),
+	MAX1363_MODE_SINGLE(2),
+	MAX1363_MODE_SINGLE(3),
+	MAX1363_MODE_SINGLE(4),
+	MAX1363_MODE_SINGLE(5),
+	MAX1363_MODE_SINGLE(6),
+	MAX1363_MODE_SINGLE(7),
+	MAX1363_MODE_SINGLE(8),
+	MAX1363_MODE_SINGLE(9),
+	MAX1363_MODE_SINGLE(10),
+	MAX1363_MODE_SINGLE(11),
+
+	MAX1363_MODE_SINGLE_TIMES_8(0),
+	MAX1363_MODE_SINGLE_TIMES_8(1),
+	MAX1363_MODE_SINGLE_TIMES_8(2),
+	MAX1363_MODE_SINGLE_TIMES_8(3),
+	MAX1363_MODE_SINGLE_TIMES_8(4),
+	MAX1363_MODE_SINGLE_TIMES_8(5),
+	MAX1363_MODE_SINGLE_TIMES_8(6),
+	MAX1363_MODE_SINGLE_TIMES_8(7),
+	MAX1363_MODE_SINGLE_TIMES_8(8),
+	MAX1363_MODE_SINGLE_TIMES_8(9),
+	MAX1363_MODE_SINGLE_TIMES_8(10),
+	MAX1363_MODE_SINGLE_TIMES_8(11),
+
+	MAX1363_MODE_SCAN_TO_CHANNEL(1),
+	MAX1363_MODE_SCAN_TO_CHANNEL(2),
+	MAX1363_MODE_SCAN_TO_CHANNEL(3),
+	MAX1363_MODE_SCAN_TO_CHANNEL(4),
+	MAX1363_MODE_SCAN_TO_CHANNEL(5),
+	MAX1363_MODE_SCAN_TO_CHANNEL(6),
+	MAX1363_MODE_SCAN_TO_CHANNEL(7),
+	MAX1363_MODE_SCAN_TO_CHANNEL(8),
+	MAX1363_MODE_SCAN_TO_CHANNEL(9),
+	MAX1363_MODE_SCAN_TO_CHANNEL(10),
+	MAX1363_MODE_SCAN_TO_CHANNEL(11),
+
+	MAX1363_MODE_DIFF_SINGLE(0, 1),
+	MAX1363_MODE_DIFF_SINGLE(2, 3),
+	MAX1363_MODE_DIFF_SINGLE(4, 5),
+	MAX1363_MODE_DIFF_SINGLE(6, 7),
+	MAX1363_MODE_DIFF_SINGLE(8, 9),
+	MAX1363_MODE_DIFF_SINGLE(10, 11),
+	MAX1363_MODE_DIFF_SINGLE(1, 0),
+	MAX1363_MODE_DIFF_SINGLE(3, 2),
+	MAX1363_MODE_DIFF_SINGLE(5, 4),
+	MAX1363_MODE_DIFF_SINGLE(7, 6),
+	MAX1363_MODE_DIFF_SINGLE(9, 8),
+	MAX1363_MODE_DIFF_SINGLE(11, 10),
+
+	MAX1363_MODE_DIFF_SINGLE_TIMES_8(0, 1),
+	MAX1363_MODE_DIFF_SINGLE_TIMES_8(2, 3),
+	MAX1363_MODE_DIFF_SINGLE_TIMES_8(4, 5),
+	MAX1363_MODE_DIFF_SINGLE_TIMES_8(6, 7),
+	MAX1363_MODE_DIFF_SINGLE_TIMES_8(8, 9),
+	MAX1363_MODE_DIFF_SINGLE_TIMES_8(10, 11),
+	MAX1363_MODE_DIFF_SINGLE_TIMES_8(1, 0),
+	MAX1363_MODE_DIFF_SINGLE_TIMES_8(3, 2),
+	MAX1363_MODE_DIFF_SINGLE_TIMES_8(5, 4),
+	MAX1363_MODE_DIFF_SINGLE_TIMES_8(7, 6),
+	MAX1363_MODE_DIFF_SINGLE_TIMES_8(9, 8),
+	MAX1363_MODE_DIFF_SINGLE_TIMES_8(11, 10),
+
+	MAX1363_MODE_DIFF_SCAN_TO_CHANNEL_NAMED(0-1...2-3, 2, 2),
+	MAX1363_MODE_DIFF_SCAN_TO_CHANNEL_NAMED(0-1...4-5, 4, 3),
+	MAX1363_MODE_DIFF_SCAN_TO_CHANNEL_NAMED(0-1...6-7, 6, 4),
+	MAX1363_MODE_DIFF_SCAN_TO_CHANNEL_NAMED(0-1...8-9, 8, 5),
+	MAX1363_MODE_DIFF_SCAN_TO_CHANNEL_NAMED(0-1...10-11, 10, 6),
+	MAX1363_MODE_DIFF_SCAN_TO_CHANNEL_NAMED(1-0...3-2, 3, 2),
+	MAX1363_MODE_DIFF_SCAN_TO_CHANNEL_NAMED(1-0...5-4, 5, 3),
+	MAX1363_MODE_DIFF_SCAN_TO_CHANNEL_NAMED(1-0...7-6, 7, 4),
+	MAX1363_MODE_DIFF_SCAN_TO_CHANNEL_NAMED(1-0...9-8, 9, 5),
+	MAX1363_MODE_DIFF_SCAN_TO_CHANNEL_NAMED(1-0...11-10, 11, 6),
+
+	MAX1236_MODE_SCAN_MID_TO_CHANNEL(2, 3),
+	MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 7),
+	MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 8),
+	MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 9),
+	MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 10),
+	MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 11),
+
+	MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL_NAMED(6-7...8-9, 8, 2),
+	MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL_NAMED(6-7...10-11, 10, 3),
+	MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL_NAMED(7-6...9-8, 9, 2),
+	MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL_NAMED(7-6...11-10, 11, 3),
+};
+
+/* Applies to max1363 */
+static const enum max1363_modes max1363_mode_list[] = {
+	_s0, _s1, _s2, _s3,
+	se0, se1, se2, se3,
+	s0to1, s0to2, s0to3,
+	d0m1, d2m3, d1m0, d3m2,
+	de0m1, de2m3, de1m0, de3m2,
+	d0m1to2m3, d1m0to3m2,
+};
+
+/* Appies to max1236, max1237 */
+static const enum max1363_modes max1236_mode_list[] = {
+	_s0, _s1, _s2, _s3,
+	se0, se1, se2, se3,
+	s0to1, s0to2, s0to3,
+	d0m1, d2m3, d1m0, d3m2,
+	de0m1, de2m3, de1m0, de3m2,
+	d0m1to2m3, d1m0to3m2,
+	s2to3,
+};
+
+/* Applies to max1238, max1239 */
+static const enum max1363_modes max1238_mode_list[] = {
+	_s0, _s1, _s2, _s3, _s4, _s5, _s6, _s7, _s8, _s9, _s10, _s11,
+	se0, se1, se2, se3, se4, se5, se6, se7, se8, se9, se10, se11,
+	s0to1, s0to2, s0to3, s0to4, s0to5, s0to6,
+	s0to7, s0to8, s0to9, s0to10, s0to11,
+	d0m1, d2m3, d4m5, d6m7, d8m9, d10m11,
+	d1m0, d3m2, d5m4, d7m6, d9m8, d11m10,
+	de0m1, de2m3, de4m5, de6m7, de8m9, de10m11,
+	de1m0, de3m2, de5m4, de7m6, de9m8, de11m10,
+	d0m1to2m3, d0m1to4m5, d0m1to6m7, d0m1to8m9, d0m1to10m11,
+	d1m0to3m2, d1m0to5m4, d1m0to7m6, d1m0to9m8, d1m0to11m10,
+	s2to3, s6to7, s6to8, s6to9, s6to10, s6to11,
+	s6m7to8m9, s6m7to10m11, s7m6to9m8, s7m6to11m10,
+};
+struct max1363_chip_info {
+	const char *name;
+	u8 num_inputs;
+	u16 int_vref_mv;
+	bool monitor_mode;
+	const enum max1363_modes *mode_list;
+	int num_modes;
+	enum max1363_modes default_mode;
+};
+
+
+enum { max1361,
+       max1362,
+       max1363,
+       max1364,
+
+       max1136,
+       max1137,
+       max1138,
+       max1139,
+       max1236,
+       max1237,
+       max1238,
+       max1239,
+};
+
+/* max1363 and max1368 tested - rest from data sheet */
+static const struct max1363_chip_info max1363_chip_info_tbl[] = {
+	{
+		.name = "max1361",
+		.num_inputs = 4,
+		.monitor_mode = 1,
+		.mode_list = max1363_mode_list,
+		.num_modes = ARRAY_SIZE(max1363_mode_list),
+		.default_mode = s0to3,
+	}, {
+		.name = "max1362",
+		.num_inputs = 4,
+		.monitor_mode = 1,
+		.mode_list = max1363_mode_list,
+		.num_modes = ARRAY_SIZE(max1363_mode_list),
+		.default_mode = s0to3,
+	}, {
+		.name = "max1363",
+		.num_inputs = 4,
+		.monitor_mode = 1,
+		.mode_list = max1363_mode_list,
+		.num_modes = ARRAY_SIZE(max1363_mode_list),
+		.default_mode = s0to3,
+	}, {
+		.name = "max1364",
+		.num_inputs = 4,
+		.monitor_mode = 1,
+		.mode_list = max1363_mode_list,
+		.num_modes = ARRAY_SIZE(max1363_mode_list),
+		.default_mode = s0to3,
+	}, {
+		.name = "max1136",
+		.num_inputs = 4,
+		.int_vref_mv = 4096,
+		.mode_list = max1236_mode_list,
+		.num_modes = ARRAY_SIZE(max1236_mode_list),
+		.default_mode = s0to3,
+	}, {
+		.name = "max1137",
+		.num_inputs = 4,
+		.int_vref_mv = 2048,
+		.mode_list = max1236_mode_list,
+		.num_modes = ARRAY_SIZE(max1236_mode_list),
+		.default_mode = s0to3,
+	}, {
+		.name = "max1138",
+		.num_inputs = 12,
+		.int_vref_mv = 4096,
+		.mode_list = max1238_mode_list,
+		.num_modes = ARRAY_SIZE(max1238_mode_list),
+		.default_mode = s0to11,
+	}, {
+		.name = "max1139",
+		.num_inputs = 12,
+		.int_vref_mv = 2048,
+		.mode_list = max1238_mode_list,
+		.num_modes = ARRAY_SIZE(max1238_mode_list),
+		.default_mode = s0to11,
+	}, {
+		.name = "max1236",
+		.num_inputs = 4,
+		.int_vref_mv = 4096,
+		.mode_list = max1236_mode_list,
+		.num_modes = ARRAY_SIZE(max1236_mode_list),
+		.default_mode = s0to3,
+	}, {
+		.name = "max1237",
+		.num_inputs = 4,
+		.int_vref_mv = 2048,
+		.mode_list = max1236_mode_list,
+		.num_modes = ARRAY_SIZE(max1236_mode_list),
+		.default_mode = s0to3,
+	}, {
+		.name = "max1238",
+		.num_inputs = 12,
+		.int_vref_mv = 4096,
+		.mode_list = max1238_mode_list,
+		.num_modes = ARRAY_SIZE(max1238_mode_list),
+		.default_mode = s0to11,
+	}, {
+		.name = "max1239",
+		.num_inputs = 12,
+		.int_vref_mv = 2048,
+		.mode_list = max1238_mode_list,
+		.num_modes = ARRAY_SIZE(max1238_mode_list),
+		.default_mode = s0to11,
+	},
+};
+
+struct max1363_data {
+	struct iio_dev *indio_dev;
+	struct iio_work_cont work_cont_thresh;
+	struct i2c_client *client;
+	/* Device does not support reading config bytes so keep copies here */
+	char setupbyte;
+	char configbyte;
+	const struct max1363_chip_info *chip_info;
+	const struct max1363_mode *current_mode;
+/* periodic interrupt related */
+	struct work_struct poll_work;
+	atomic_t protect_ring;
+};
+
+static int max1363_write_basic_config(struct i2c_client *client,
+				      unsigned char d1,
+				      unsigned char d2)
+{
+	int ret;
+	struct i2c_msg msg = {
+		.addr = client->addr,
+		.flags = 0,
+		.len = 2,
+	};
+	unsigned char *tx_buf;
+
+	tx_buf = kmalloc(2, GFP_KERNEL);
+	tx_buf[0] = d1;
+	tx_buf[1] = d2;
+	msg.buf = tx_buf;
+
+	ret = i2c_transfer(client->adapter, &msg, 1);
+	if (ret = 1)
+		ret = 0;
+
+	kfree(tx_buf);
+	return ret;
+}
+
+/* Monitor mode config */
+static int max1363_write_monitor_config(struct i2c_client *client,
+					unsigned char d1,
+					unsigned char d2)
+{
+	int ret;
+	struct i2c_msg msg = {
+		.addr = client->addr,
+		.flags = 0,
+		.len = 15,
+	};
+	unsigned char *tx_buf;
+	tx_buf = kmalloc(15, GFP_KERNEL);
+	msg.buf = tx_buf;
+	tx_buf[0] = d2;
+	tx_buf[1] = d1 | MAX1363_SETUP_MONITOR_SETUP;
+	/* Always reset alarms for now */
+	tx_buf[2] = MAX1363_MON_RESET_CHAN(0)
+		| MAX1363_MON_RESET_CHAN(1)
+		| MAX1363_MON_RESET_CHAN(2)
+		| MAX1363_MON_RESET_CHAN(3)
+		| MAX1363_MON_CONV_RATE_1_0ksps
+		| MAX1363_MON_INT_ENABLE;
+	/*theshold are interleved gah! */
+	/* lower thesh very little, upper, quite a bit */
+	tx_buf[3] = 0x00;
+	tx_buf[4] = 0x0E;
+	tx_buf[5] = 0x00;
+	/*Channel 1 disable */
+	tx_buf[6] = 0x00;
+	tx_buf[7] = 0x0F;
+	tx_buf[8] = 0x0F;
+	/*Channel 2 disable */
+	tx_buf[9] = 0x00;
+	tx_buf[10] = 0x0F;
+	tx_buf[11] = 0xFF;
+	/* Channel 3 disbale */
+	tx_buf[12] = 0x00;
+	tx_buf[13] = 0x0F;
+	tx_buf[14] = 0xFF;
+
+	ret = i2c_transfer(client->adapter, &msg, 1);
+	if (ret = 1)
+		ret = 0;
+
+	kfree(tx_buf);
+	return ret;
+
+}
+
+static int max1363_set_scan_mode(struct device *dev,
+				 struct max1363_data *data)
+{
+	int ret;
+
+	data->configbyte &= ~(MAX1363_CHANNEL_SEL_MASK
+			      | MAX1363_SCAN_MASK
+			      | MAX1363_SE_DE_MASK);
+	data->configbyte |= data->current_mode->conf;
+
+	ret = max1363_write_basic_config(data->client,
+					 data->setupbyte,
+					 data->configbyte);
+/* TO FINISH IMPLEMENTING
+	ret = max1363_write_monitor_config(data->client,
+					   data->setupbyte,
+					   data->configbyte);*/
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static void max1363_thresh_handler_bh_no_check(struct work_struct *work_s)
+{
+}
+
+static void max1363_thresh_handler_bh(struct work_struct *work_s)
+{
+}
+
+static int max1363_power_down(struct max1363_data *data)
+{
+	return 0;
+}
+
+static int max1363_initial_setup(struct max1363_data *data)
+{
+	int ret;
+
+	data->setupbyte
+		= MAX1363_SETUP_AIN3_IS_AIN3_REF_IS_VDD
+		| MAX1363_SETUP_POWER_UP_INT_REF
+		| MAX1363_SETUP_INT_CLOCK
+		| MAX1363_SETUP_UNIPOLAR
+		| MAX1363_SETUP_NORESET;
+	data->setupbyte = MAX1363_SETUP_BYTE(data->setupbyte);
+	data->current_mode = &max1363_mode_table[data->chip_info->default_mode];
+	data->configbyte = MAX1363_CONFIG_BYTE(data->configbyte);
+	/* Set scan mode writes the config anyway so don't explicitly do it */
+	ret = max1363_set_scan_mode(data->indio_dev->dev, data);
+
+	return ret;
+}
+
+static ssize_t max1363_show_av_scan_modes(struct device *dev,
+					  struct device_attribute *attr,
+					  char *buf)
+{
+	struct iio_dev *dev_info = dev_get_drvdata(dev);
+	struct max1363_data *data = dev_info->dev_data;
+	int i, len = 0;
+
+	for (i = 0; i < data->chip_info->num_modes; i++)
+		len += sprintf(buf + len, "%s ",
+			       max1363_mode_table[data->chip_info
+						  ->mode_list[i]].name);
+	len += sprintf(buf + len, "\n");
+
+	return len;
+}
+
+static ssize_t max1363_scan_from_ring(struct device *dev,
+				      struct device_attribute *attr,
+				      char *buf)
+{
+	struct iio_dev *dev_info = dev_get_drvdata(dev);
+	struct max1363_data *info = dev_info->dev_data;
+	int i, ret, len = 0;
+	char *ring_data;
+
+	ring_data = kmalloc(info->current_mode->numvals*2, GFP_KERNEL);
+	if (ring_data = NULL) {
+		ret = -ENOMEM;
+		goto error_ret;
+	}
+
+	ret = iio_read_last_from_sw_ring(dev_info->ring, ring_data);
+	if (ret)
+		goto error_free_ring_data;
+	len += sprintf(buf+len, "ring ");
+	for (i = 0; i < info->current_mode->numvals; i++)
+		len += sprintf(buf + len, "%d ",
+			       ((int)(ring_data[i*2 + 0]&0x0F) << 8)
+			       + ((int)(ring_data[i*2 + 1])));
+	len += sprintf(buf + len, "\n");
+	kfree(ring_data);
+
+	return len;
+
+error_free_ring_data:
+	kfree(ring_data);
+error_ret:
+	return ret;
+}
+
+static ssize_t max1363_scan_direct(struct device *dev,
+				   struct device_attribute *attr,
+				   char *buf)
+{
+	struct iio_dev *dev_info = dev_get_drvdata(dev);
+	struct max1363_data *data = dev_info->dev_data;
+	int len = 0, ret, i;
+	struct i2c_client *client = to_i2c_client(dev);
+
+
+	struct i2c_msg msg = {
+		.addr = client->addr,
+		.flags = I2C_M_RD,
+		.len = data->current_mode->numvals*2,
+	};
+	char *rxbuf;
+
+	if (data->current_mode->numvals = 0)
+		return 0;
+	rxbuf = kmalloc(data->current_mode->numvals*2, GFP_KERNEL);
+	if (rxbuf = NULL)
+		return -ENOMEM;
+	msg.buf = rxbuf;
+	/* Interpretation depends on whether these are signed or not!*/
+	/* Assume not for now */
+	ret = i2c_transfer(client->adapter, &msg, 1);
+	if (ret = 1)
+		ret = 0;
+	for (i = 0; i < data->current_mode->numvals; i++)
+		len += sprintf(buf+len, "%d ",
+			       ((int)(rxbuf[i*2+0]&0x0F) << 8)
+			       + ((int)(rxbuf[i*2+1])));
+	kfree(rxbuf);
+	len += sprintf(buf + len, "\n");
+
+	return len;
+}
+
+static ssize_t max1363_scan(struct device *dev,
+			    struct device_attribute *attr,
+			    char *buf)
+{
+	struct iio_dev *dev_info = dev_get_drvdata(dev);
+	int ret;
+
+	mutex_lock(&dev_info->mlock);
+	if (dev_info->currentmode = INDIO_RING_POLLED)
+		ret = max1363_scan_from_ring(dev, attr, buf);
+	else
+		ret = max1363_scan_direct(dev, attr, buf);
+	mutex_unlock(&dev_info->mlock);
+
+	return ret;
+}
+
+/* Cannot query the device, so use local copy of state */
+static ssize_t max1363_show_scan_mode(struct device *dev,
+				      struct device_attribute *attr,
+				      char *buf)
+{
+	int len = 0;
+	struct iio_dev *dev_info = dev_get_drvdata(dev);
+	struct max1363_data *data = dev_info->dev_data;
+
+	len += sprintf(buf, "%s\n", data->current_mode->name);
+
+	return len;
+}
+
+static ssize_t max1363_store_scan_mode(struct device *dev,
+				       struct device_attribute *attr,
+				       const char *buf,
+				       size_t len)
+{
+	struct iio_dev *dev_info = dev_get_drvdata(dev);
+	struct max1363_data *data = dev_info->dev_data;
+	int i, ret;
+
+	mutex_lock(&dev_info->mlock);
+	data->current_mode = NULL;
+	for (i = 0; i <  data->chip_info->num_modes; i++) {
+		if (strncmp(max1363_mode_table[data->chip_info->mode_list[i]]
+			   .name, buf, strlen(buf)-1) = 0) {
+			data->current_mode
+				= &max1363_mode_table[data
+						      ->chip_info
+						      ->mode_list[i]];
+			break;
+		}
+	}
+	if (!data->current_mode) {
+		ret = -EINVAL;
+		goto error_ret;
+	}
+	ret =  max1363_set_scan_mode(dev, data);
+	if (ret)
+		goto error_ret;
+	mutex_unlock(&dev_info->mlock);
+
+	return len;
+
+error_ret:
+	mutex_unlock(&dev_info->mlock);
+
+	return ret;
+}
+
+IIO_DEV_ATTR_AVAIL_SCAN_MODES(max1363_show_av_scan_modes);
+IIO_DEV_ATTR_SCAN_MODE(S_IRUGO | S_IWUSR,
+		       max1363_show_scan_mode,
+		       max1363_store_scan_mode);
+
+IIO_DEV_ATTR_SCAN(max1363_scan);
+
+
+static int max1363_ring_preenable(struct iio_dev *indio_dev)
+{
+	struct max1363_data *data = indio_dev->dev_data;
+	indio_dev->ring_bytes_per_datum
+		= data->current_mode->numvals*2 + sizeof(s64);
+	return 0;
+}
+
+static int max1363_ring_postenable(struct iio_dev *indio_dev)
+{
+	return iio_ptimer_irq_set_state(indio_dev, 1);
+}
+
+static int max1363_ring_predisable(struct iio_dev *indio_dev)
+{
+	return iio_ptimer_irq_set_state(indio_dev, 0);
+}
+
+static struct attribute *max1363_attributes[] = {
+	&iio_dev_attr_available_scan_modes.dev_attr.attr,
+	&iio_dev_attr_scan_mode.dev_attr.attr,
+	&iio_dev_attr_scan.dev_attr.attr,
+	NULL,
+};
+
+static const struct attribute_group max1363_attribute_group = {
+	.attrs = max1363_attributes,
+};
+
+static struct attribute *max1363_event_attributes[] = {
+	NULL,
+};
+
+static struct attribute_group max1363_event_attribute_group = {
+	.attrs = max1363_event_attributes,
+};
+
+void max1363_poll_func_th(void *private_data)
+{
+	struct iio_dev *indio_dev = private_data;
+	struct max1363_data *data = indio_dev->dev_data;
+	schedule_work(&data->poll_work);
+	return;
+}
+
+/* Could we have two of these running at once -
+ * yes unfortunately and we can't let that happen
+ * as the ring buffer does not support concurrent writes
+ * hence check if one is running already and stop if it is.*/
+
+static void max1363_poll_bh_to_ring(struct work_struct *work_s)
+{
+	/* This shares a lot with a normal scan read - combine them? */
+	struct max1363_data *data = container_of(work_s, struct max1363_data,
+						 poll_work);
+	struct iio_dev *indio_dev = data->indio_dev;
+	struct iio_sw_ring_buffer *ring = indio_dev->ring;
+	s64 time_ns;
+
+	struct i2c_msg msg = {
+		.addr = data->client->addr,
+		.flags = I2C_M_RD,
+		.len = data->current_mode->numvals*2,
+		};
+	__u8 *rxbuf;
+	int ret;
+
+	if (atomic_inc_return(&data->protect_ring) > 1)
+	  return;
+
+	/* Monitor mode prevents reading */
+	if (data->current_mode->numvals = 0)
+		return;
+	/* FIXME - missmatch in size somewhere */
+	rxbuf = kmalloc(data->current_mode->numvals*2+8, GFP_KERNEL);
+	if (rxbuf = NULL)
+		return;
+	msg.buf = rxbuf;
+	ret = i2c_transfer(data->client->adapter, &msg, 1);
+	if (ret = 1)
+		ret = 0;
+	else if (ret)
+		goto done;
+	time_ns = iio_get_time_ns();
+	memcpy(rxbuf + data->current_mode->numvals*2,
+	       &time_ns, sizeof(time_ns));
+	iio_store_to_sw_ring(ring, rxbuf, time_ns);
+ done:
+	kfree(rxbuf);
+	atomic_dec(&data->protect_ring);
+}
+
+
+static int __devinit max1363_probe(struct i2c_client *client,
+				   const struct i2c_device_id *id)
+{
+	int ret, i;
+	struct max1363_data *data;
+
+	data = kzalloc(sizeof(struct max1363_data), GFP_KERNEL);
+
+	if (data = NULL) {
+		dev_err(&client->dev, "Memory allocation error \n");
+		ret = -ENOMEM;
+		goto error_ret;
+	}
+	atomic_set(&data->protect_ring, 0);
+
+	data->chip_info = NULL;
+	for (i = 0; i < ARRAY_SIZE(max1363_chip_info_tbl); i++)
+		if (!strcmp(max1363_chip_info_tbl[i].name, id->name)) {
+			data->chip_info = &max1363_chip_info_tbl[i];
+			break;
+		};
+
+	if (!data->chip_info) {
+		dev_err(&client->dev, "%s is not supported\n", id->name);
+		ret = -ENODEV;
+		goto error_free_data;
+	}
+
+	data->client = client;
+	data->indio_dev = kzalloc(sizeof(struct iio_dev), GFP_KERNEL);
+	if (data->indio_dev = NULL) {
+		dev_err(&client->dev, "Memory allocation error\n");
+		ret = -ENOMEM;
+		goto error_free_data;
+	}
+
+	data->indio_dev->dev = &client->dev;
+	data->indio_dev->num_interrupt_lines = 1;
+	data->indio_dev->event_attrs = &max1363_event_attribute_group;
+	data->indio_dev->attrs = &max1363_attribute_group;
+	data->indio_dev->dev_data = (void *)(data);
+
+	data->indio_dev->modes = INDIO_DIRECT_MODE;
+
+	data->indio_dev->ring_postenable = &max1363_ring_postenable;
+	data->indio_dev->ring_preenable	= &max1363_ring_preenable;
+	data->indio_dev->ring_predisable = &max1363_ring_predisable;
+	data->indio_dev->ring_poll_func = &max1363_poll_func_th;
+	data->indio_dev->ring_length = 500;
+	INIT_WORK(&data->poll_work, &max1363_poll_bh_to_ring);
+/* As this is set a timer will be requested by industrialio-core */
+	data->indio_dev->modes |= INDIO_RING_POLLED;
+
+	/* Poll filled ring buffer - using periodic rtc interrupt for now.
+	 * See discussion with David Brownell on rtc list for other options.
+	 */
+
+	ret = iio_device_register(data->indio_dev);
+	if (ret)
+		goto error_free_device;
+	/* set a sensible default frequency for the timer */
+	if (data->indio_dev->ptimer)
+		iio_ptimer_set_freq(data->indio_dev->ptimer, 128);
+	if (client->irq && gpio_is_valid(irq_to_gpio(client->irq)) > 0) {
+
+		INIT_IIO_WORK_CONT(&data->work_cont_thresh,
+				   max1363_thresh_handler_bh_no_check,
+				   max1363_thresh_handler_bh,
+				   0,
+				   0,
+				   data);
+		ret = iio_register_interrupt_line(client->irq,
+						  data->indio_dev,
+						  0,
+						  IRQF_TRIGGER_RISING,
+						  "max1363");
+		if (ret)
+			goto error_unregister_dev;
+	}
+
+
+	ret = max1363_initial_setup(data);
+	if (ret)
+		goto error_unregister_line;
+
+	return 0;
+
+error_unregister_line:
+	if (client->irq && gpio_is_valid(irq_to_gpio(client->irq)) > 0)
+		iio_unregister_interrupt_line(data->indio_dev, 0);
+
+error_unregister_dev:
+	iio_device_unregister(data->indio_dev);
+error_free_device:
+	kfree(data->indio_dev);
+error_free_data:
+	kfree(data);
+error_ret:
+	return ret;
+}
+
+static int max1363_remove(struct i2c_client *client)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(client);
+	struct max1363_data *data = indio_dev->dev_data;
+	int ret;
+	/* Stop the device */
+	ret = max1363_power_down(data);
+	if (client->irq && gpio_is_valid(irq_to_gpio(client->irq)) > 0)
+		iio_unregister_interrupt_line(data->indio_dev, 0);
+
+	iio_device_unregister(indio_dev);
+	kfree(indio_dev);
+	kfree(data);
+	return 0;
+}
+
+static const struct i2c_device_id max1363_id[] = {
+	{ "max1361", max1361 },
+	{ "max1362", max1362 },
+	{ "max1363", max1363 },
+	{ "max1364", max1364 },
+	{ "max1136", max1136 },
+	{ "max1137", max1137 },
+	{ "max1138", max1138 },
+	{ "max1139", max1139 },
+	{ "max1236", max1236 },
+	{ "max1237", max1237 },
+	{ "max1238", max1238 },
+	{ "max1239", max1239 },
+	{}
+};
+
+MODULE_DEVICE_TABLE(i2c, max1363_id);
+
+static struct i2c_driver max1363_driver = {
+	.driver = {
+		.name		= "max1363",
+	},
+	.probe = max1363_probe,
+	.remove = max1363_remove,
+	.id_table = max1363_id,
+};
+
+
+static __init int max1363_init(void)
+{
+	return i2c_add_driver(&max1363_driver);
+}
+
+static __exit void max1363_exit(void)
+{
+	i2c_del_driver(&max1363_driver);
+}
+
+MODULE_AUTHOR("Jonathan Cameron <jic23@cam.ac.uk");
+MODULE_DESCRIPTION("Maxim 1363 ADC");
+MODULE_LICENSE("GPL v2");
+
+module_init(max1363_init);
+module_exit(max1363_exit);


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