d1325cf450
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>
624 lines
16 KiB
C
624 lines
16 KiB
C
/*
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* linux/drivers/industrialio/adc/max1363.c
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* Copyright (C) 2008 Jonathan Cameron
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*
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* based on linux/drivers/i2c/chips/max123x
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* Copyright (C) 2002-2004 Stefan Eletzhofer
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*
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* based on linux/drivers/acron/char/pcf8583.c
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* Copyright (C) 2000 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* max1363.c
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*
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* Partial support for max1363 and similar chips.
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*
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* Not currently implemented.
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*
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* - Monitor interrrupt generation.
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* - Control of internal reference.
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* - Sysfs scan interface currently assumes unipolar mode.
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*/
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#include <linux/interrupt.h>
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#include <linux/gpio.h>
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#include <linux/workqueue.h>
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/sysfs.h>
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#include <linux/list.h>
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#include <linux/i2c.h>
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#include <linux/rtc.h>
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#include <linux/regulator/consumer.h>
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#include "../iio.h"
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#include "../sysfs.h"
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#include "max1363.h"
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/* Available scan modes.
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* Awkwardly the associated enum is in the header so it is available to
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* the ring buffer code.
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*/
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static const struct max1363_mode max1363_mode_table[] = {
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MAX1363_MODE_SINGLE(0),
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MAX1363_MODE_SINGLE(1),
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MAX1363_MODE_SINGLE(2),
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MAX1363_MODE_SINGLE(3),
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MAX1363_MODE_SINGLE(4),
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MAX1363_MODE_SINGLE(5),
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MAX1363_MODE_SINGLE(6),
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MAX1363_MODE_SINGLE(7),
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MAX1363_MODE_SINGLE(8),
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MAX1363_MODE_SINGLE(9),
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MAX1363_MODE_SINGLE(10),
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MAX1363_MODE_SINGLE(11),
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MAX1363_MODE_SINGLE_TIMES_8(0),
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MAX1363_MODE_SINGLE_TIMES_8(1),
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MAX1363_MODE_SINGLE_TIMES_8(2),
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MAX1363_MODE_SINGLE_TIMES_8(3),
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MAX1363_MODE_SINGLE_TIMES_8(4),
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MAX1363_MODE_SINGLE_TIMES_8(5),
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MAX1363_MODE_SINGLE_TIMES_8(6),
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MAX1363_MODE_SINGLE_TIMES_8(7),
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MAX1363_MODE_SINGLE_TIMES_8(8),
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MAX1363_MODE_SINGLE_TIMES_8(9),
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MAX1363_MODE_SINGLE_TIMES_8(10),
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MAX1363_MODE_SINGLE_TIMES_8(11),
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MAX1363_MODE_SCAN_TO_CHANNEL(1),
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MAX1363_MODE_SCAN_TO_CHANNEL(2),
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MAX1363_MODE_SCAN_TO_CHANNEL(3),
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MAX1363_MODE_SCAN_TO_CHANNEL(4),
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MAX1363_MODE_SCAN_TO_CHANNEL(5),
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MAX1363_MODE_SCAN_TO_CHANNEL(6),
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MAX1363_MODE_SCAN_TO_CHANNEL(7),
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MAX1363_MODE_SCAN_TO_CHANNEL(8),
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MAX1363_MODE_SCAN_TO_CHANNEL(9),
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MAX1363_MODE_SCAN_TO_CHANNEL(10),
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MAX1363_MODE_SCAN_TO_CHANNEL(11),
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MAX1363_MODE_DIFF_SINGLE(0, 1),
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MAX1363_MODE_DIFF_SINGLE(2, 3),
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MAX1363_MODE_DIFF_SINGLE(4, 5),
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MAX1363_MODE_DIFF_SINGLE(6, 7),
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MAX1363_MODE_DIFF_SINGLE(8, 9),
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MAX1363_MODE_DIFF_SINGLE(10, 11),
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MAX1363_MODE_DIFF_SINGLE(1, 0),
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MAX1363_MODE_DIFF_SINGLE(3, 2),
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MAX1363_MODE_DIFF_SINGLE(5, 4),
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MAX1363_MODE_DIFF_SINGLE(7, 6),
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MAX1363_MODE_DIFF_SINGLE(9, 8),
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MAX1363_MODE_DIFF_SINGLE(11, 10),
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MAX1363_MODE_DIFF_SINGLE_TIMES_8(0, 1),
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MAX1363_MODE_DIFF_SINGLE_TIMES_8(2, 3),
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MAX1363_MODE_DIFF_SINGLE_TIMES_8(4, 5),
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MAX1363_MODE_DIFF_SINGLE_TIMES_8(6, 7),
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MAX1363_MODE_DIFF_SINGLE_TIMES_8(8, 9),
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MAX1363_MODE_DIFF_SINGLE_TIMES_8(10, 11),
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MAX1363_MODE_DIFF_SINGLE_TIMES_8(1, 0),
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MAX1363_MODE_DIFF_SINGLE_TIMES_8(3, 2),
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MAX1363_MODE_DIFF_SINGLE_TIMES_8(5, 4),
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MAX1363_MODE_DIFF_SINGLE_TIMES_8(7, 6),
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MAX1363_MODE_DIFF_SINGLE_TIMES_8(9, 8),
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MAX1363_MODE_DIFF_SINGLE_TIMES_8(11, 10),
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MAX1363_MODE_DIFF_SCAN_TO_CHANNEL_NAMED(0-1...2-3, 2, 2),
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MAX1363_MODE_DIFF_SCAN_TO_CHANNEL_NAMED(0-1...4-5, 4, 3),
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MAX1363_MODE_DIFF_SCAN_TO_CHANNEL_NAMED(0-1...6-7, 6, 4),
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MAX1363_MODE_DIFF_SCAN_TO_CHANNEL_NAMED(0-1...8-9, 8, 5),
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MAX1363_MODE_DIFF_SCAN_TO_CHANNEL_NAMED(0-1...10-11, 10, 6),
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MAX1363_MODE_DIFF_SCAN_TO_CHANNEL_NAMED(1-0...3-2, 3, 2),
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MAX1363_MODE_DIFF_SCAN_TO_CHANNEL_NAMED(1-0...5-4, 5, 3),
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MAX1363_MODE_DIFF_SCAN_TO_CHANNEL_NAMED(1-0...7-6, 7, 4),
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MAX1363_MODE_DIFF_SCAN_TO_CHANNEL_NAMED(1-0...9-8, 9, 5),
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MAX1363_MODE_DIFF_SCAN_TO_CHANNEL_NAMED(1-0...11-10, 11, 6),
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MAX1236_MODE_SCAN_MID_TO_CHANNEL(2, 3),
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MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 7),
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MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 8),
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MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 9),
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MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 10),
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MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 11),
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MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL_NAMED(6-7...8-9, 8, 2),
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MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL_NAMED(6-7...10-11, 10, 3),
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MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL_NAMED(7-6...9-8, 9, 2),
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MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL_NAMED(7-6...11-10, 11, 3),
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};
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/* Applies to max1363 */
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static const enum max1363_modes max1363_mode_list[] = {
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_s0, _s1, _s2, _s3,
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se0, se1, se2, se3,
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s0to1, s0to2, s0to3,
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d0m1, d2m3, d1m0, d3m2,
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de0m1, de2m3, de1m0, de3m2,
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d0m1to2m3, d1m0to3m2,
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};
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/* Appies to max1236, max1237 */
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static const enum max1363_modes max1236_mode_list[] = {
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_s0, _s1, _s2, _s3,
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se0, se1, se2, se3,
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s0to1, s0to2, s0to3,
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d0m1, d2m3, d1m0, d3m2,
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de0m1, de2m3, de1m0, de3m2,
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d0m1to2m3, d1m0to3m2,
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s2to3,
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};
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/* Applies to max1238, max1239 */
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static const enum max1363_modes max1238_mode_list[] = {
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_s0, _s1, _s2, _s3, _s4, _s5, _s6, _s7, _s8, _s9, _s10, _s11,
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se0, se1, se2, se3, se4, se5, se6, se7, se8, se9, se10, se11,
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s0to1, s0to2, s0to3, s0to4, s0to5, s0to6,
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s0to7, s0to8, s0to9, s0to10, s0to11,
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d0m1, d2m3, d4m5, d6m7, d8m9, d10m11,
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d1m0, d3m2, d5m4, d7m6, d9m8, d11m10,
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de0m1, de2m3, de4m5, de6m7, de8m9, de10m11,
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de1m0, de3m2, de5m4, de7m6, de9m8, de11m10,
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d0m1to2m3, d0m1to4m5, d0m1to6m7, d0m1to8m9, d0m1to10m11,
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d1m0to3m2, d1m0to5m4, d1m0to7m6, d1m0to9m8, d1m0to11m10,
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s6to7, s6to8, s6to9, s6to10, s6to11,
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s6m7to8m9, s6m7to10m11, s7m6to9m8, s7m6to11m10,
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};
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enum { max1361,
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max1362,
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max1363,
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max1364,
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max1136,
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max1137,
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max1138,
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max1139,
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max1236,
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max1237,
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max1238,
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max1239,
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};
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/* max1363 and max1368 tested - rest from data sheet */
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static const struct max1363_chip_info max1363_chip_info_tbl[] = {
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{
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.name = "max1361",
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.num_inputs = 4,
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.monitor_mode = 1,
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.mode_list = max1363_mode_list,
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.num_modes = ARRAY_SIZE(max1363_mode_list),
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.default_mode = s0to3,
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}, {
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.name = "max1362",
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.num_inputs = 4,
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.monitor_mode = 1,
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.mode_list = max1363_mode_list,
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.num_modes = ARRAY_SIZE(max1363_mode_list),
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.default_mode = s0to3,
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}, {
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.name = "max1363",
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.num_inputs = 4,
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.monitor_mode = 1,
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.mode_list = max1363_mode_list,
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.num_modes = ARRAY_SIZE(max1363_mode_list),
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.default_mode = s0to3,
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}, {
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.name = "max1364",
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.num_inputs = 4,
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.monitor_mode = 1,
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.mode_list = max1363_mode_list,
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.num_modes = ARRAY_SIZE(max1363_mode_list),
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.default_mode = s0to3,
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}, {
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.name = "max1136",
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.num_inputs = 4,
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.int_vref_mv = 4096,
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.mode_list = max1236_mode_list,
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.num_modes = ARRAY_SIZE(max1236_mode_list),
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.default_mode = s0to3,
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}, {
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.name = "max1137",
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.num_inputs = 4,
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.int_vref_mv = 2048,
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.mode_list = max1236_mode_list,
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.num_modes = ARRAY_SIZE(max1236_mode_list),
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.default_mode = s0to3,
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}, {
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.name = "max1138",
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.num_inputs = 12,
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.int_vref_mv = 4096,
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.mode_list = max1238_mode_list,
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.num_modes = ARRAY_SIZE(max1238_mode_list),
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.default_mode = s0to11,
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}, {
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.name = "max1139",
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.num_inputs = 12,
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.int_vref_mv = 2048,
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.mode_list = max1238_mode_list,
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.num_modes = ARRAY_SIZE(max1238_mode_list),
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.default_mode = s0to11,
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}, {
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.name = "max1236",
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.num_inputs = 4,
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.int_vref_mv = 4096,
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.mode_list = max1236_mode_list,
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.num_modes = ARRAY_SIZE(max1236_mode_list),
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.default_mode = s0to3,
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}, {
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.name = "max1237",
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.num_inputs = 4,
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.int_vref_mv = 2048,
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.mode_list = max1236_mode_list,
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.num_modes = ARRAY_SIZE(max1236_mode_list),
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.default_mode = s0to3,
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}, {
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.name = "max1238",
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.num_inputs = 12,
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.int_vref_mv = 4096,
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.mode_list = max1238_mode_list,
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.num_modes = ARRAY_SIZE(max1238_mode_list),
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.default_mode = s0to11,
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}, {
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.name = "max1239",
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.num_inputs = 12,
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.int_vref_mv = 2048,
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.mode_list = max1238_mode_list,
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.num_modes = ARRAY_SIZE(max1238_mode_list),
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.default_mode = s0to11,
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},
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};
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static int max1363_write_basic_config(struct i2c_client *client,
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unsigned char d1,
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unsigned char d2)
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{
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int ret;
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u8 *tx_buf = kmalloc(2 , GFP_KERNEL);
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if (!tx_buf)
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return -ENOMEM;
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tx_buf[0] = d1;
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tx_buf[1] = d2;
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ret = i2c_master_send(client, tx_buf, 2);
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kfree(tx_buf);
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return (ret > 0) ? 0 : ret;
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}
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static int max1363_set_scan_mode(struct max1363_state *st)
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{
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st->configbyte &= ~(MAX1363_CHANNEL_SEL_MASK
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| MAX1363_SCAN_MASK
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| MAX1363_SE_DE_MASK);
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st->configbyte |= st->current_mode->conf;
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return max1363_write_basic_config(st->client,
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st->setupbyte,
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st->configbyte);
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}
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static int max1363_initial_setup(struct max1363_state *st)
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{
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st->setupbyte = MAX1363_SETUP_AIN3_IS_AIN3_REF_IS_VDD
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| MAX1363_SETUP_POWER_UP_INT_REF
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| MAX1363_SETUP_INT_CLOCK
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| MAX1363_SETUP_UNIPOLAR
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| MAX1363_SETUP_NORESET;
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/* Set scan mode writes the config anyway so wait until then*/
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st->setupbyte = MAX1363_SETUP_BYTE(st->setupbyte);
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st->current_mode = &max1363_mode_table[st->chip_info->default_mode];
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st->configbyte = MAX1363_CONFIG_BYTE(st->configbyte);
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return max1363_set_scan_mode(st);
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}
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static ssize_t max1363_show_av_scan_modes(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct iio_dev *dev_info = dev_get_drvdata(dev);
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struct max1363_state *st = dev_info->dev_data;
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int i, len = 0;
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for (i = 0; i < st->chip_info->num_modes; i++)
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len += sprintf(buf + len, "%s ",
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max1363_mode_table[st->chip_info
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->mode_list[i]].name);
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len += sprintf(buf + len, "\n");
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return len;
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}
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/* The dev here is the sysfs related one, not the underlying i2c one */
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static ssize_t max1363_scan_direct(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct iio_dev *dev_info = dev_get_drvdata(dev);
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struct max1363_state *st = dev_info->dev_data;
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int len = 0, ret, i;
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struct i2c_client *client = st->client;
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char *rxbuf;
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if (st->current_mode->numvals == 0)
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return 0;
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rxbuf = kmalloc(st->current_mode->numvals*2, GFP_KERNEL);
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if (rxbuf == NULL)
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return -ENOMEM;
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/* Interpretation depends on whether these are signed or not!*/
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/* Assume not for now */
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ret = i2c_master_recv(client, rxbuf, st->current_mode->numvals*2);
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if (ret < 0)
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return ret;
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for (i = 0; i < st->current_mode->numvals; i++)
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len += sprintf(buf+len, "%d ",
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((int)(rxbuf[i*2+0]&0x0F) << 8)
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+ ((int)(rxbuf[i*2+1])));
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kfree(rxbuf);
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len += sprintf(buf + len, "\n");
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return len;
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}
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static ssize_t max1363_scan(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct iio_dev *dev_info = dev_get_drvdata(dev);
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int ret;
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mutex_lock(&dev_info->mlock);
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if (dev_info->currentmode == INDIO_RING_TRIGGERED)
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ret = max1363_scan_from_ring(dev, attr, buf);
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else
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ret = max1363_scan_direct(dev, attr, buf);
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mutex_unlock(&dev_info->mlock);
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return ret;
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}
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/* Cannot query the device, so use local copy of state */
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static ssize_t max1363_show_scan_mode(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct iio_dev *dev_info = dev_get_drvdata(dev);
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struct max1363_state *st = dev_info->dev_data;
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return sprintf(buf, "%s\n", st->current_mode->name);
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}
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static const struct max1363_mode
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*__max1363_find_mode_in_ci(const struct max1363_chip_info *info,
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const char *buf)
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{
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int i;
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for (i = 0; i < info->num_modes; i++)
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if (strcmp(max1363_mode_table[info->mode_list[i]].name, buf)
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== 0)
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return &max1363_mode_table[info->mode_list[i]];
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return NULL;
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}
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static ssize_t max1363_store_scan_mode(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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size_t len)
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{
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struct iio_dev *dev_info = dev_get_drvdata(dev);
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struct max1363_state *st = dev_info->dev_data;
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const struct max1363_mode *new_mode;
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int ret;
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mutex_lock(&dev_info->mlock);
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new_mode = NULL;
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/* 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);
|