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

Jonathan Cameron
2008-07-23T17:11:51Z

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);