diff options
author | Jonathan Cameron <jic23@cam.ac.uk> | 2009-08-18 18:06:20 +0100 |
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committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-09-15 12:02:24 -0700 |
commit | d1325cf45077bd27db3271dfc320c40bf65a8a07 (patch) | |
tree | 59954caa5fada2767cc0647828a4b621c99b8958 /drivers/staging/iio/adc | |
parent | 847ec80bbaa76aae41062d6802cea9c1b2289f14 (diff) | |
download | op-kernel-dev-d1325cf45077bd27db3271dfc320c40bf65a8a07.zip op-kernel-dev-d1325cf45077bd27db3271dfc320c40bf65a8a07.tar.gz |
Staging: IIO: max1363 ADC driver
Core support for MAX1361, MAX1362, MAX1363, MAX1364,
MAX1136, MAX1137, MAX1138, MAX1139, MAX1236, MAX1237,
MAX1238, MAX1239.
Ring buffer support later in series.
Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/staging/iio/adc')
-rw-r--r-- | drivers/staging/iio/adc/Kconfig | 13 | ||||
-rw-r--r-- | drivers/staging/iio/adc/Makefile | 7 | ||||
-rw-r--r-- | drivers/staging/iio/adc/max1363.h | 257 | ||||
-rw-r--r-- | drivers/staging/iio/adc/max1363_core.c | 623 |
4 files changed, 900 insertions, 0 deletions
diff --git a/drivers/staging/iio/adc/Kconfig b/drivers/staging/iio/adc/Kconfig new file mode 100644 index 0000000..b8c2858 --- /dev/null +++ b/drivers/staging/iio/adc/Kconfig @@ -0,0 +1,13 @@ +# +# ADC drivers +# +comment "Analog to digital convertors" + +config MAX1363 + tristate "MAXIM max1363 ADC driver" + depends on I2C + 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. diff --git a/drivers/staging/iio/adc/Makefile b/drivers/staging/iio/adc/Makefile new file mode 100644 index 0000000..2a37fee --- /dev/null +++ b/drivers/staging/iio/adc/Makefile @@ -0,0 +1,7 @@ + +# Makefile for industrial I/O ADC drivers +# + +max1363-y := max1363_core.o + +obj-$(CONFIG_MAX1363) += max1363.o diff --git a/drivers/staging/iio/adc/max1363.h b/drivers/staging/iio/adc/max1363.h new file mode 100644 index 0000000..a9d5c21 --- /dev/null +++ b/drivers/staging/iio/adc/max1363.h @@ -0,0 +1,257 @@ +#ifndef _MAX1363_H_ +#define _MAX1363_H_ + +#define MAX1363_SETUP_BYTE(a) ((a) | 0x80) + +/* There is a fair bit more defined here than currently + * used, but the intention is to support everything these + * chips do in the long run */ + +/* 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 + +/* think about includeing max11600 etc - more settings */ +#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. + * For now monitor modes are not implemented as the relevant + * line is not connected on my test board. + * The definitions are here as I intend to add this soon. + */ +#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 - scan mode information + * @name: Name used to identify the scan mode. + * @conf: The corresponding value of the configuration register + * @numvals: The number of values returned by a single scan + */ +struct max1363_mode { + const char *name; + int8_t conf; + 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, \ +} + +/* Not currently handled */ +#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 in max1363_core */ +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, +}; + +/** + * struct max1363_chip_info - chip specifc information + * @name: indentification string for chip + * @num_inputs: number of physical inputs on chip + * @int_vref_mv: the internal reference voltage + * @monitor_mode: whether the chip supports monitor interrupts + * @mode_list: array of available scan modes + * @num_modes: the number of scan modes available + * @default_mode: the scan mode in which the chip starts up + */ +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; +}; + + +/** + * struct max1363_state - driver instance specific data + * @indio_dev: the industrial I/O device + * @client: i2c_client + * @setupbyte: cache of current device setup byte + * @configbyte: cache of current device config byte + * @chip_info: chip model specific constants, available modes etc + * @current_mode: the scan mode of this chip + * @poll_work: bottom half of polling interrupt handler + * @protect_ring: used to ensure only one polling bh running at a time + * @reg: supply regulator + */ +struct max1363_state { + struct iio_dev *indio_dev; + struct i2c_client *client; + char setupbyte; + char configbyte; + const struct max1363_chip_info *chip_info; + const struct max1363_mode *current_mode; + struct work_struct poll_work; + atomic_t protect_ring; + struct iio_trigger *trig; + struct regulator *reg; +}; + +static inline void max1363_uninitialize_ring(struct iio_ring_buffer *ring) +{ +}; + +static inline int max1363_initialize_ring(struct iio_ring_buffer *ring) +{ + return 0; +}; + + +static inline ssize_t max1363_scan_from_ring(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + return 0; +}; + +static inline int +max1363_register_ring_funcs_and_init(struct iio_dev *indio_dev) +{ + return 0; +}; + +static inline void max1363_ring_cleanup(struct iio_dev *indio_dev) {}; + +#endif /* _MAX1363_H_ */ diff --git a/drivers/staging/iio/adc/max1363_core.c b/drivers/staging/iio/adc/max1363_core.c new file mode 100644 index 0000000..9703881 --- /dev/null +++ b/drivers/staging/iio/adc/max1363_core.c @@ -0,0 +1,623 @@ + /* + * 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 + * + * Partial support for max1363 and similar chips. + * + * Not currently implemented. + * + * - Monitor interrrupt generation. + * - Control of internal reference. + * - Sysfs scan interface currently assumes unipolar mode. + */ + +#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/regulator/consumer.h> + +#include "../iio.h" +#include "../sysfs.h" + +#include "max1363.h" + +/* Available scan modes. + * Awkwardly the associated enum is in the header so it is available to + * the ring buffer code. + */ +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, + s6to7, s6to8, s6to9, s6to10, s6to11, + s6m7to8m9, s6m7to10m11, s7m6to9m8, s7m6to11m10, +}; + + +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, + }, +}; + +static int max1363_write_basic_config(struct i2c_client *client, + unsigned char d1, + unsigned char d2) +{ + int ret; + u8 *tx_buf = kmalloc(2 , GFP_KERNEL); + if (!tx_buf) + return -ENOMEM; + tx_buf[0] = d1; + tx_buf[1] = d2; + + ret = i2c_master_send(client, tx_buf, 2); + kfree(tx_buf); + return (ret > 0) ? 0 : ret; +} + +static int max1363_set_scan_mode(struct max1363_state *st) +{ + st->configbyte &= ~(MAX1363_CHANNEL_SEL_MASK + | MAX1363_SCAN_MASK + | MAX1363_SE_DE_MASK); + st->configbyte |= st->current_mode->conf; + + return max1363_write_basic_config(st->client, + st->setupbyte, + st->configbyte); +} + +static int max1363_initial_setup(struct max1363_state *st) +{ + st->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; + + /* Set scan mode writes the config anyway so wait until then*/ + st->setupbyte = MAX1363_SETUP_BYTE(st->setupbyte); + st->current_mode = &max1363_mode_table[st->chip_info->default_mode]; + st->configbyte = MAX1363_CONFIG_BYTE(st->configbyte); + + return max1363_set_scan_mode(st); +} + +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_state *st = dev_info->dev_data; + int i, len = 0; + + for (i = 0; i < st->chip_info->num_modes; i++) + len += sprintf(buf + len, "%s ", + max1363_mode_table[st->chip_info + ->mode_list[i]].name); + len += sprintf(buf + len, "\n"); + + return len; +} + + +/* The dev here is the sysfs related one, not the underlying i2c one */ +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_state *st = dev_info->dev_data; + int len = 0, ret, i; + struct i2c_client *client = st->client; + char *rxbuf; + + if (st->current_mode->numvals == 0) + return 0; + rxbuf = kmalloc(st->current_mode->numvals*2, GFP_KERNEL); + if (rxbuf == NULL) + return -ENOMEM; + + /* Interpretation depends on whether these are signed or not!*/ + /* Assume not for now */ + ret = i2c_master_recv(client, rxbuf, st->current_mode->numvals*2); + + if (ret < 0) + return ret; + for (i = 0; i < st->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_TRIGGERED) + 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) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct max1363_state *st = dev_info->dev_data; + + return sprintf(buf, "%s\n", st->current_mode->name); +} + +static const struct max1363_mode +*__max1363_find_mode_in_ci(const struct max1363_chip_info *info, + const char *buf) +{ + int i; + for (i = 0; i < info->num_modes; i++) + if (strcmp(max1363_mode_table[info->mode_list[i]].name, buf) + == 0) + return &max1363_mode_table[info->mode_list[i]]; + return NULL; +} + +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_state *st = dev_info->dev_data; + const struct max1363_mode *new_mode; + int ret; + + mutex_lock(&dev_info->mlock); + new_mode = NULL; + /* Avoid state changes if a ring buffer is enabled */ + if (!iio_ring_enabled(dev_info)) { + new_mode + = __max1363_find_mode_in_ci(st->chip_info, buf); + if (!new_mode) { + ret = -EINVAL; + goto error_ret; + } + st->current_mode = new_mode; + ret = max1363_set_scan_mode(st); + if (ret) + goto error_ret; + } else { + ret = -EBUSY; + 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 ssize_t max1363_show_name(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct max1363_state *st = dev_info->dev_data; + return sprintf(buf, "%s\n", st->chip_info->name); +} + +IIO_DEVICE_ATTR(name, S_IRUGO, max1363_show_name, NULL, 0); + +/*name export */ + +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, + &iio_dev_attr_name.dev_attr.attr, + NULL, +}; + +static const struct attribute_group max1363_attribute_group = { + .attrs = max1363_attributes, +}; + +static int __devinit max1363_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + int ret, i, regdone = 0; + struct max1363_state *st = kzalloc(sizeof(*st), GFP_KERNEL); + if (st == NULL) { + ret = -ENOMEM; + goto error_ret; + } + + /* this is only used for device removal purposes */ + i2c_set_clientdata(client, st); + + atomic_set(&st->protect_ring, 0); + + /* Find the chip model specific data */ + for (i = 0; i < ARRAY_SIZE(max1363_chip_info_tbl); i++) + if (!strcmp(max1363_chip_info_tbl[i].name, id->name)) { + st->chip_info = &max1363_chip_info_tbl[i]; + break; + }; + /* Unsupported chip */ + if (!st->chip_info) { + dev_err(&client->dev, "%s is not supported\n", id->name); + ret = -ENODEV; + goto error_free_st; + } + st->reg = regulator_get(&client->dev, "vcc"); + if (!IS_ERR(st->reg)) { + ret = regulator_enable(st->reg); + if (ret) + goto error_put_reg; + } + st->client = client; + + st->indio_dev = iio_allocate_device(); + if (st->indio_dev == NULL) { + ret = -ENOMEM; + goto error_disable_reg; + } + + /* Estabilish that the iio_dev is a child of the i2c device */ + st->indio_dev->dev.parent = &client->dev; + st->indio_dev->attrs = &max1363_attribute_group; + st->indio_dev->dev_data = (void *)(st); + st->indio_dev->driver_module = THIS_MODULE; + st->indio_dev->modes = INDIO_DIRECT_MODE; + + ret = max1363_initial_setup(st); + if (ret) + goto error_free_device; + + ret = max1363_register_ring_funcs_and_init(st->indio_dev); + if (ret) + goto error_free_device; + + ret = iio_device_register(st->indio_dev); + if (ret) + goto error_cleanup_ring; + regdone = 1; + ret = max1363_initialize_ring(st->indio_dev->ring); + if (ret) + goto error_cleanup_ring; + return 0; +error_cleanup_ring: + max1363_ring_cleanup(st->indio_dev); +error_free_device: + if (!regdone) + iio_free_device(st->indio_dev); + else + iio_device_unregister(st->indio_dev); +error_disable_reg: + if (!IS_ERR(st->reg)) + regulator_disable(st->reg); +error_put_reg: + if (!IS_ERR(st->reg)) + regulator_put(st->reg); +error_free_st: + kfree(st); + +error_ret: + return ret; +} + +static int max1363_remove(struct i2c_client *client) +{ + struct max1363_state *st = i2c_get_clientdata(client); + struct iio_dev *indio_dev = st->indio_dev; + max1363_uninitialize_ring(indio_dev->ring); + max1363_ring_cleanup(indio_dev); + iio_device_unregister(indio_dev); + if (!IS_ERR(st->reg)) { + regulator_disable(st->reg); + regulator_put(st->reg); + } + kfree(st); + + 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); |