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max1363.c
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/*
* iio/adc/max1363.c
* Copyright (C) 2008-2010 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
*
* Driver for max1363 and similar chips.
*
* 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.
*/
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/sysfs.h>
#include <linux/list.h>
#include <linux/i2c.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/events.h>
#include <linux/iio/buffer.h>
#include <linux/iio/driver.h>
#include <linux/iio/kfifo_buf.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_buffer.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 including 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_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
#define MAX1363_MAX_CHANNELS 25
/**
* struct max1363_mode - scan mode information
* @conf: The corresponding value of the configuration register
* @modemask: Bit mask corresponding to channels enabled in this mode
*/
struct max1363_mode {
int8_t conf;
DECLARE_BITMAP(modemask, MAX1363_MAX_CHANNELS);
};
/* 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,
/* Differential single read */
d0m1, d2m3, d4m5, d6m7, d8m9, d10m11,
d1m0, d3m2, d5m4, d7m6, d9m8, d11m10,
/* Scan to channel and mid to channel where overlapping */
s0to1, s0to2, s2to3, s0to3, s0to4, s0to5, s0to6,
s6to7, s0to7, s6to8, s0to8, s6to9,
s0to9, s6to10, s0to10, s6to11, s0to11,
/* Differential scan to channel and mid to channel where overlapping */
d0m1to2m3, d0m1to4m5, d0m1to6m7, d6m7to8m9,
d0m1to8m9, d6m7to10m11, d0m1to10m11, d1m0to3m2,
d1m0to5m4, d1m0to7m6, d7m6to9m8, d1m0to9m8,
d7m6to11m10, d1m0to11m10,
};
/**
* struct max1363_chip_info - chip specifc information
* @info: iio core function callbacks structure
* @channels: channel specification
* @num_channels: number of channels
* @mode_list: array of available scan modes
* @default_mode: the scan mode in which the chip starts up
* @int_vref_mv: the internal reference voltage
* @num_modes: number of modes
* @bits: accuracy of the adc in bits
*/
struct max1363_chip_info {
const struct iio_info *info;
const struct iio_chan_spec *channels;
int num_channels;
const enum max1363_modes *mode_list;
enum max1363_modes default_mode;
u16 int_vref_mv;
u8 num_modes;
u8 bits;
};
/**
* struct max1363_state - driver instance specific data
* @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
* @requestedmask: a valid requested set of channels
* @reg: supply regulator
* @monitor_on: whether monitor mode is enabled
* @monitor_speed: parameter corresponding to device monitor speed setting
* @mask_high: bitmask for enabled high thresholds
* @mask_low: bitmask for enabled low thresholds
* @thresh_high: high threshold values
* @thresh_low: low threshold values
* @vref: Reference voltage regulator
* @vref_uv: Actual (external or internal) reference voltage
* @send: function used to send data to the chip
* @recv: function used to receive data from the chip
*/
struct max1363_state {
struct i2c_client *client;
u8 setupbyte;
u8 configbyte;
const struct max1363_chip_info *chip_info;
const struct max1363_mode *current_mode;
u32 requestedmask;
struct regulator *reg;
/* Using monitor modes and buffer at the same time is
currently not supported */
bool monitor_on;
unsigned int monitor_speed:3;
u8 mask_high;
u8 mask_low;
/* 4x unipolar first then the fours bipolar ones */
s16 thresh_high[8];
s16 thresh_low[8];
struct regulator *vref;
u32 vref_uv;
int (*send)(const struct i2c_client *client,
const char *buf, int count);
int (*recv)(const struct i2c_client *client,
char *buf, int count);
};
#define MAX1363_MODE_SINGLE(_num, _mask) { \
.conf = MAX1363_CHANNEL_SEL(_num) \
| MAX1363_CONFIG_SCAN_SINGLE_1 \
| MAX1363_CONFIG_SE, \
.modemask[0] = _mask, \
}
#define MAX1363_MODE_SCAN_TO_CHANNEL(_num, _mask) { \
.conf = MAX1363_CHANNEL_SEL(_num) \
| MAX1363_CONFIG_SCAN_TO_CS \
| MAX1363_CONFIG_SE, \
.modemask[0] = _mask, \
}
/* note not available for max1363 hence naming */
#define MAX1236_MODE_SCAN_MID_TO_CHANNEL(_mid, _num, _mask) { \
.conf = MAX1363_CHANNEL_SEL(_num) \
| MAX1236_SCAN_MID_TO_CHANNEL \
| MAX1363_CONFIG_SE, \
.modemask[0] = _mask \
}
#define MAX1363_MODE_DIFF_SINGLE(_nump, _numm, _mask) { \
.conf = MAX1363_CHANNEL_SEL(_nump) \
| MAX1363_CONFIG_SCAN_SINGLE_1 \
| MAX1363_CONFIG_DE, \
.modemask[0] = _mask \
}
/* Can't think how to automate naming so specify for now */
#define MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(_num, _numvals, _mask) { \
.conf = MAX1363_CHANNEL_SEL(_num) \
| MAX1363_CONFIG_SCAN_TO_CS \
| MAX1363_CONFIG_DE, \
.modemask[0] = _mask \
}
/* note only available for max1363 hence naming */
#define MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL(_num, _numvals, _mask) { \
.conf = MAX1363_CHANNEL_SEL(_num) \
| MAX1236_SCAN_MID_TO_CHANNEL \
| MAX1363_CONFIG_SE, \
.modemask[0] = _mask \
}
static const struct max1363_mode max1363_mode_table[] = {
/* All of the single channel options first */
MAX1363_MODE_SINGLE(0, 1 << 0),
MAX1363_MODE_SINGLE(1, 1 << 1),
MAX1363_MODE_SINGLE(2, 1 << 2),
MAX1363_MODE_SINGLE(3, 1 << 3),
MAX1363_MODE_SINGLE(4, 1 << 4),
MAX1363_MODE_SINGLE(5, 1 << 5),
MAX1363_MODE_SINGLE(6, 1 << 6),
MAX1363_MODE_SINGLE(7, 1 << 7),
MAX1363_MODE_SINGLE(8, 1 << 8),
MAX1363_MODE_SINGLE(9, 1 << 9),
MAX1363_MODE_SINGLE(10, 1 << 10),
MAX1363_MODE_SINGLE(11, 1 << 11),
MAX1363_MODE_DIFF_SINGLE(0, 1, 1 << 12),
MAX1363_MODE_DIFF_SINGLE(2, 3, 1 << 13),
MAX1363_MODE_DIFF_SINGLE(4, 5, 1 << 14),
MAX1363_MODE_DIFF_SINGLE(6, 7, 1 << 15),
MAX1363_MODE_DIFF_SINGLE(8, 9, 1 << 16),
MAX1363_MODE_DIFF_SINGLE(10, 11, 1 << 17),
MAX1363_MODE_DIFF_SINGLE(1, 0, 1 << 18),
MAX1363_MODE_DIFF_SINGLE(3, 2, 1 << 19),
MAX1363_MODE_DIFF_SINGLE(5, 4, 1 << 20),
MAX1363_MODE_DIFF_SINGLE(7, 6, 1 << 21),
MAX1363_MODE_DIFF_SINGLE(9, 8, 1 << 22),
MAX1363_MODE_DIFF_SINGLE(11, 10, 1 << 23),
/* The multichannel scans next */
MAX1363_MODE_SCAN_TO_CHANNEL(1, 0x003),
MAX1363_MODE_SCAN_TO_CHANNEL(2, 0x007),
MAX1236_MODE_SCAN_MID_TO_CHANNEL(2, 3, 0x00C),
MAX1363_MODE_SCAN_TO_CHANNEL(3, 0x00F),
MAX1363_MODE_SCAN_TO_CHANNEL(4, 0x01F),
MAX1363_MODE_SCAN_TO_CHANNEL(5, 0x03F),
MAX1363_MODE_SCAN_TO_CHANNEL(6, 0x07F),
MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 7, 0x0C0),
MAX1363_MODE_SCAN_TO_CHANNEL(7, 0x0FF),
MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 8, 0x1C0),
MAX1363_MODE_SCAN_TO_CHANNEL(8, 0x1FF),
MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 9, 0x3C0),
MAX1363_MODE_SCAN_TO_CHANNEL(9, 0x3FF),
MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 10, 0x7C0),
MAX1363_MODE_SCAN_TO_CHANNEL(10, 0x7FF),
MAX1236_MODE_SCAN_MID_TO_CHANNEL(6, 11, 0xFC0),
MAX1363_MODE_SCAN_TO_CHANNEL(11, 0xFFF),
MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(2, 2, 0x003000),
MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(4, 3, 0x007000),
MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(6, 4, 0x00F000),
MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL(8, 2, 0x018000),
MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(8, 5, 0x01F000),
MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL(10, 3, 0x038000),
MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(10, 6, 0x3F000),
MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(3, 2, 0x0C0000),
MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(5, 3, 0x1C0000),
MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(7, 4, 0x3C0000),
MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL(9, 2, 0x600000),
MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(9, 5, 0x7C0000),
MAX1236_MODE_DIFF_SCAN_MID_TO_CHANNEL(11, 3, 0xE00000),
MAX1363_MODE_DIFF_SCAN_TO_CHANNEL(11, 6, 0xFC0000),
};
static const struct max1363_mode
*max1363_match_mode(const unsigned long *mask,
const struct max1363_chip_info *ci)
{
int i;
if (mask)
for (i = 0; i < ci->num_modes; i++)
if (bitmap_subset(mask,
max1363_mode_table[ci->mode_list[i]].
modemask,
MAX1363_MAX_CHANNELS))
return &max1363_mode_table[ci->mode_list[i]];
return NULL;
}
static int max1363_smbus_send(const struct i2c_client *client, const char *buf,
int count)
{
int i, err;
for (i = err = 0; err == 0 && i < count; ++i)
err = i2c_smbus_write_byte(client, buf[i]);
return err ? err : count;
}
static int max1363_smbus_recv(const struct i2c_client *client, char *buf,
int count)
{
int i, ret;
for (i = 0; i < count; ++i) {
ret = i2c_smbus_read_byte(client);
if (ret < 0)
return ret;
buf[i] = ret;
}
return count;
}
static int max1363_write_basic_config(struct max1363_state *st)
{
u8 tx_buf[2] = { st->setupbyte, st->configbyte };
return st->send(st->client, tx_buf, 2);
}
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);
}
static int max1363_read_single_chan(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val,
long m)
{
int ret = 0;
s32 data;
u8 rxbuf[2];
struct max1363_state *st = iio_priv(indio_dev);
struct i2c_client *client = st->client;
mutex_lock(&indio_dev->mlock);
/*
* If monitor mode is enabled, the method for reading a single
* channel will have to be rather different and has not yet
* been implemented.
*
* Also, cannot read directly if buffered capture enabled.
*/
if (st->monitor_on || iio_buffer_enabled(indio_dev)) {
ret = -EBUSY;
goto error_ret;
}
/* Check to see if current scan mode is correct */
if (st->current_mode != &max1363_mode_table[chan->address]) {
/* Update scan mode if needed */
st->current_mode = &max1363_mode_table[chan->address];
ret = max1363_set_scan_mode(st);
if (ret < 0)
goto error_ret;
}
if (st->chip_info->bits != 8) {
/* Get reading */
data = st->recv(client, rxbuf, 2);
if (data < 0) {
ret = data;
goto error_ret;
}
data = (rxbuf[1] | rxbuf[0] << 8) &
((1 << st->chip_info->bits) - 1);
} else {
/* Get reading */
data = st->recv(client, rxbuf, 1);
if (data < 0) {
ret = data;
goto error_ret;
}
data = rxbuf[0];
}
*val = data;
error_ret:
mutex_unlock(&indio_dev->mlock);
return ret;
}
static int max1363_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val,
int *val2,
long m)
{
struct max1363_state *st = iio_priv(indio_dev);
int ret;
switch (m) {
case IIO_CHAN_INFO_RAW:
ret = max1363_read_single_chan(indio_dev, chan, val, m);
if (ret < 0)
return ret;
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
*val = st->vref_uv / 1000;
*val2 = st->chip_info->bits;
return IIO_VAL_FRACTIONAL_LOG2;
default:
return -EINVAL;
}
return 0;
}
/* Applies to max1363 */
static const enum max1363_modes max1363_mode_list[] = {
_s0, _s1, _s2, _s3,
s0to1, s0to2, s0to3,
d0m1, d2m3, d1m0, d3m2,
d0m1to2m3, d1m0to3m2,
};
static const struct iio_event_spec max1363_events[] = {
{
.type = IIO_EV_TYPE_THRESH,
.dir = IIO_EV_DIR_RISING,
.mask_separate = BIT(IIO_EV_INFO_VALUE) |
BIT(IIO_EV_INFO_ENABLE),
}, {
.type = IIO_EV_TYPE_THRESH,
.dir = IIO_EV_DIR_FALLING,
.mask_separate = BIT(IIO_EV_INFO_VALUE) |
BIT(IIO_EV_INFO_ENABLE),
},
};
#define MAX1363_CHAN_U(num, addr, si, bits, ev_spec, num_ev_spec) \
{ \
.type = IIO_VOLTAGE, \
.indexed = 1, \
.channel = num, \
.address = addr, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
.datasheet_name = "AIN"#num, \
.scan_type = { \
.sign = 'u', \
.realbits = bits, \
.storagebits = (bits > 8) ? 16 : 8, \
.endianness = IIO_BE, \
}, \
.scan_index = si, \
.event_spec = ev_spec, \
.num_event_specs = num_ev_spec, \
}
/* bipolar channel */
#define MAX1363_CHAN_B(num, num2, addr, si, bits, ev_spec, num_ev_spec) \
{ \
.type = IIO_VOLTAGE, \
.differential = 1, \
.indexed = 1, \
.channel = num, \
.channel2 = num2, \
.address = addr, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
.datasheet_name = "AIN"#num"-AIN"#num2, \
.scan_type = { \
.sign = 's', \
.realbits = bits, \
.storagebits = (bits > 8) ? 16 : 8, \
.endianness = IIO_BE, \
}, \
.scan_index = si, \
.event_spec = ev_spec, \
.num_event_specs = num_ev_spec, \
}
#define MAX1363_4X_CHANS(bits, ev_spec, num_ev_spec) { \
MAX1363_CHAN_U(0, _s0, 0, bits, ev_spec, num_ev_spec), \
MAX1363_CHAN_U(1, _s1, 1, bits, ev_spec, num_ev_spec), \
MAX1363_CHAN_U(2, _s2, 2, bits, ev_spec, num_ev_spec), \
MAX1363_CHAN_U(3, _s3, 3, bits, ev_spec, num_ev_spec), \
MAX1363_CHAN_B(0, 1, d0m1, 4, bits, ev_spec, num_ev_spec), \
MAX1363_CHAN_B(2, 3, d2m3, 5, bits, ev_spec, num_ev_spec), \
MAX1363_CHAN_B(1, 0, d1m0, 6, bits, ev_spec, num_ev_spec), \
MAX1363_CHAN_B(3, 2, d3m2, 7, bits, ev_spec, num_ev_spec), \
IIO_CHAN_SOFT_TIMESTAMP(8) \
}
static const struct iio_chan_spec max1036_channels[] =
MAX1363_4X_CHANS(8, NULL, 0);
static const struct iio_chan_spec max1136_channels[] =
MAX1363_4X_CHANS(10, NULL, 0);
static const struct iio_chan_spec max1236_channels[] =
MAX1363_4X_CHANS(12, NULL, 0);
static const struct iio_chan_spec max1361_channels[] =
MAX1363_4X_CHANS(10, max1363_events, ARRAY_SIZE(max1363_events));
static const struct iio_chan_spec max1363_channels[] =
MAX1363_4X_CHANS(12, max1363_events, ARRAY_SIZE(max1363_events));
/* Applies to max1236, max1237 */
static const enum max1363_modes max1236_mode_list[] = {
_s0, _s1, _s2, _s3,
s0to1, s0to2, s0to3,
d0m1, d2m3, d1m0, d3m2,
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,
s0to1, s0to2, s0to3, s0to4, s0to5, s0to6,
s0to7, s0to8, s0to9, s0to10, s0to11,
d0m1, d2m3, d4m5, d6m7, d8m9, d10m11,
d1m0, d3m2, d5m4, d7m6, d9m8, d11m10,
d0m1to2m3, d0m1to4m5, d0m1to6m7, d0m1to8m9, d0m1to10m11,
d1m0to3m2, d1m0to5m4, d1m0to7m6, d1m0to9m8, d1m0to11m10,
s6to7, s6to8, s6to9, s6to10, s6to11,
d6m7to8m9, d6m7to10m11, d7m6to9m8, d7m6to11m10,
};
#define MAX1363_12X_CHANS(bits) { \
MAX1363_CHAN_U(0, _s0, 0, bits, NULL, 0), \
MAX1363_CHAN_U(1, _s1, 1, bits, NULL, 0), \
MAX1363_CHAN_U(2, _s2, 2, bits, NULL, 0), \
MAX1363_CHAN_U(3, _s3, 3, bits, NULL, 0), \
MAX1363_CHAN_U(4, _s4, 4, bits, NULL, 0), \
MAX1363_CHAN_U(5, _s5, 5, bits, NULL, 0), \
MAX1363_CHAN_U(6, _s6, 6, bits, NULL, 0), \
MAX1363_CHAN_U(7, _s7, 7, bits, NULL, 0), \
MAX1363_CHAN_U(8, _s8, 8, bits, NULL, 0), \
MAX1363_CHAN_U(9, _s9, 9, bits, NULL, 0), \
MAX1363_CHAN_U(10, _s10, 10, bits, NULL, 0), \
MAX1363_CHAN_U(11, _s11, 11, bits, NULL, 0), \
MAX1363_CHAN_B(0, 1, d0m1, 12, bits, NULL, 0), \
MAX1363_CHAN_B(2, 3, d2m3, 13, bits, NULL, 0), \
MAX1363_CHAN_B(4, 5, d4m5, 14, bits, NULL, 0), \
MAX1363_CHAN_B(6, 7, d6m7, 15, bits, NULL, 0), \
MAX1363_CHAN_B(8, 9, d8m9, 16, bits, NULL, 0), \
MAX1363_CHAN_B(10, 11, d10m11, 17, bits, NULL, 0), \
MAX1363_CHAN_B(1, 0, d1m0, 18, bits, NULL, 0), \
MAX1363_CHAN_B(3, 2, d3m2, 19, bits, NULL, 0), \
MAX1363_CHAN_B(5, 4, d5m4, 20, bits, NULL, 0), \
MAX1363_CHAN_B(7, 6, d7m6, 21, bits, NULL, 0), \
MAX1363_CHAN_B(9, 8, d9m8, 22, bits, NULL, 0), \
MAX1363_CHAN_B(11, 10, d11m10, 23, bits, NULL, 0), \
IIO_CHAN_SOFT_TIMESTAMP(24) \
}
static const struct iio_chan_spec max1038_channels[] = MAX1363_12X_CHANS(8);
static const struct iio_chan_spec max1138_channels[] = MAX1363_12X_CHANS(10);
static const struct iio_chan_spec max1238_channels[] = MAX1363_12X_CHANS(12);
static const enum max1363_modes max11607_mode_list[] = {
_s0, _s1, _s2, _s3,
s0to1, s0to2, s0to3,
s2to3,
d0m1, d2m3, d1m0, d3m2,
d0m1to2m3, d1m0to3m2,
};
static const enum max1363_modes max11608_mode_list[] = {
_s0, _s1, _s2, _s3, _s4, _s5, _s6, _s7,
s0to1, s0to2, s0to3, s0to4, s0to5, s0to6, s0to7,
s6to7,
d0m1, d2m3, d4m5, d6m7,
d1m0, d3m2, d5m4, d7m6,
d0m1to2m3, d0m1to4m5, d0m1to6m7,
d1m0to3m2, d1m0to5m4, d1m0to7m6,
};
#define MAX1363_8X_CHANS(bits) { \
MAX1363_CHAN_U(0, _s0, 0, bits, NULL, 0), \
MAX1363_CHAN_U(1, _s1, 1, bits, NULL, 0), \
MAX1363_CHAN_U(2, _s2, 2, bits, NULL, 0), \
MAX1363_CHAN_U(3, _s3, 3, bits, NULL, 0), \
MAX1363_CHAN_U(4, _s4, 4, bits, NULL, 0), \
MAX1363_CHAN_U(5, _s5, 5, bits, NULL, 0), \
MAX1363_CHAN_U(6, _s6, 6, bits, NULL, 0), \
MAX1363_CHAN_U(7, _s7, 7, bits, NULL, 0), \
MAX1363_CHAN_B(0, 1, d0m1, 8, bits, NULL, 0), \
MAX1363_CHAN_B(2, 3, d2m3, 9, bits, NULL, 0), \
MAX1363_CHAN_B(4, 5, d4m5, 10, bits, NULL, 0), \
MAX1363_CHAN_B(6, 7, d6m7, 11, bits, NULL, 0), \
MAX1363_CHAN_B(1, 0, d1m0, 12, bits, NULL, 0), \
MAX1363_CHAN_B(3, 2, d3m2, 13, bits, NULL, 0), \
MAX1363_CHAN_B(5, 4, d5m4, 14, bits, NULL, 0), \
MAX1363_CHAN_B(7, 6, d7m6, 15, bits, NULL, 0), \
IIO_CHAN_SOFT_TIMESTAMP(16) \
}
static const struct iio_chan_spec max11602_channels[] = MAX1363_8X_CHANS(8);
static const struct iio_chan_spec max11608_channels[] = MAX1363_8X_CHANS(10);
static const struct iio_chan_spec max11614_channels[] = MAX1363_8X_CHANS(12);
static const enum max1363_modes max11644_mode_list[] = {
_s0, _s1, s0to1, d0m1, d1m0,
};
#define MAX1363_2X_CHANS(bits) { \
MAX1363_CHAN_U(0, _s0, 0, bits, NULL, 0), \
MAX1363_CHAN_U(1, _s1, 1, bits, NULL, 0), \
MAX1363_CHAN_B(0, 1, d0m1, 2, bits, NULL, 0), \
MAX1363_CHAN_B(1, 0, d1m0, 3, bits, NULL, 0), \
IIO_CHAN_SOFT_TIMESTAMP(4) \
}
static const struct iio_chan_spec max11646_channels[] = MAX1363_2X_CHANS(10);
static const struct iio_chan_spec max11644_channels[] = MAX1363_2X_CHANS(12);
enum { max1361,
max1362,
max1363,
max1364,
max1036,
max1037,
max1038,
max1039,
max1136,
max1137,
max1138,
max1139,
max1236,
max1237,
max1238,
max1239,
max11600,
max11601,
max11602,
max11603,
max11604,
max11605,
max11606,
max11607,
max11608,
max11609,
max11610,
max11611,
max11612,
max11613,
max11614,
max11615,
max11616,
max11617,
max11644,
max11645,
max11646,
max11647
};
static const int max1363_monitor_speeds[] = { 133000, 665000, 33300, 16600,
8300, 4200, 2000, 1000 };
static ssize_t max1363_monitor_show_freq(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct max1363_state *st = iio_priv(dev_to_iio_dev(dev));
return sprintf(buf, "%d\n", max1363_monitor_speeds[st->monitor_speed]);
}
static ssize_t max1363_monitor_store_freq(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct max1363_state *st = iio_priv(indio_dev);
int i, ret;
unsigned long val;
bool found = false;
ret = kstrtoul(buf, 10, &val);
if (ret)
return -EINVAL;
for (i = 0; i < ARRAY_SIZE(max1363_monitor_speeds); i++)
if (val == max1363_monitor_speeds[i]) {
found = true;
break;
}
if (!found)
return -EINVAL;
mutex_lock(&indio_dev->mlock);
st->monitor_speed = i;
mutex_unlock(&indio_dev->mlock);
return 0;
}
static IIO_DEV_ATTR_SAMP_FREQ(S_IRUGO | S_IWUSR,
max1363_monitor_show_freq,
max1363_monitor_store_freq);
static IIO_CONST_ATTR(sampling_frequency_available,
"133000 665000 33300 16600 8300 4200 2000 1000");
static int max1363_read_thresh(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan, enum iio_event_type type,
enum iio_event_direction dir, enum iio_event_info info, int *val,
int *val2)
{
struct max1363_state *st = iio_priv(indio_dev);
if (dir == IIO_EV_DIR_FALLING)
*val = st->thresh_low[chan->channel];
else
*val = st->thresh_high[chan->channel];
return IIO_VAL_INT;
}
static int max1363_write_thresh(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan, enum iio_event_type type,
enum iio_event_direction dir, enum iio_event_info info, int val,
int val2)
{
struct max1363_state *st = iio_priv(indio_dev);
/* make it handle signed correctly as well */
switch (st->chip_info->bits) {
case 10:
if (val > 0x3FF)
return -EINVAL;
break;
case 12:
if (val > 0xFFF)
return -EINVAL;
break;
}
switch (dir) {
case IIO_EV_DIR_FALLING:
st->thresh_low[chan->channel] = val;
break;
case IIO_EV_DIR_RISING:
st->thresh_high[chan->channel] = val;
break;
default:
return -EINVAL;
}
return 0;
}
static const u64 max1363_event_codes[] = {
IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 0,
IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING),
IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 1,
IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING),
IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 2,
IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING),
IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 3,
IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING),
IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 0,
IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING),
IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 1,
IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING),
IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 2,
IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING),
IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 3,
IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING),
};
static irqreturn_t max1363_event_handler(int irq, void *private)
{
struct iio_dev *indio_dev = private;
struct max1363_state *st = iio_priv(indio_dev);
s64 timestamp = iio_get_time_ns(indio_dev);
unsigned long mask, loc;
u8 rx;
u8 tx[2] = { st->setupbyte,
MAX1363_MON_INT_ENABLE | (st->monitor_speed << 1) | 0xF0 };
st->recv(st->client, &rx, 1);
mask = rx;
for_each_set_bit(loc, &mask, 8)
iio_push_event(indio_dev, max1363_event_codes[loc], timestamp);
st->send(st->client, tx, 2);
return IRQ_HANDLED;
}
static int max1363_read_event_config(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan, enum iio_event_type type,
enum iio_event_direction dir)
{
struct max1363_state *st = iio_priv(indio_dev);
int val;
int number = chan->channel;
mutex_lock(&indio_dev->mlock);
if (dir == IIO_EV_DIR_FALLING)
val = (1 << number) & st->mask_low;
else
val = (1 << number) & st->mask_high;
mutex_unlock(&indio_dev->mlock);
return val;
}
static int max1363_monitor_mode_update(struct max1363_state *st, int enabled)
{
u8 *tx_buf;
int ret, i = 3, j;
unsigned long numelements;
int len;
const long *modemask;
if (!enabled) {
/* transition to buffered capture is not currently supported */
st->setupbyte &= ~MAX1363_SETUP_MONITOR_SETUP;
st->configbyte &= ~MAX1363_SCAN_MASK;
st->monitor_on = false;
return max1363_write_basic_config(st);
}
/* Ensure we are in the relevant mode */
st->setupbyte |= MAX1363_SETUP_MONITOR_SETUP;
st->configbyte &= ~(MAX1363_CHANNEL_SEL_MASK
| MAX1363_SCAN_MASK
| MAX1363_SE_DE_MASK);
st->configbyte |= MAX1363_CONFIG_SCAN_MONITOR_MODE;
if ((st->mask_low | st->mask_high) & 0x0F) {
st->configbyte |= max1363_mode_table[s0to3].conf;
modemask = max1363_mode_table[s0to3].modemask;
} else if ((st->mask_low | st->mask_high) & 0x30) {
st->configbyte |= max1363_mode_table[d0m1to2m3].conf;
modemask = max1363_mode_table[d0m1to2m3].modemask;
} else {
st->configbyte |= max1363_mode_table[d1m0to3m2].conf;
modemask = max1363_mode_table[d1m0to3m2].modemask;
}
numelements = bitmap_weight(modemask, MAX1363_MAX_CHANNELS);
len = 3 * numelements + 3;
tx_buf = kmalloc(len, GFP_KERNEL);
if (!tx_buf) {
ret = -ENOMEM;
goto error_ret;
}
tx_buf[0] = st->configbyte;
tx_buf[1] = st->setupbyte;
tx_buf[2] = (st->monitor_speed << 1);
/*
* So we need to do yet another bit of nefarious scan mode
* setup to match what we need.
*/
for (j = 0; j < 8; j++)
if (test_bit(j, modemask)) {
/* Establish the mode is in the scan */
if (st->mask_low & (1 << j)) {
tx_buf[i] = (st->thresh_low[j] >> 4) & 0xFF;
tx_buf[i + 1] = (st->thresh_low[j] << 4) & 0xF0;
} else if (j < 4) {
tx_buf[i] = 0;
tx_buf[i + 1] = 0;
} else {
tx_buf[i] = 0x80;
tx_buf[i + 1] = 0;
}
if (st->mask_high & (1 << j)) {
tx_buf[i + 1] |=
(st->thresh_high[j] >> 8) & 0x0F;
tx_buf[i + 2] = st->thresh_high[j] & 0xFF;
} else if (j < 4) {
tx_buf[i + 1] |= 0x0F;
tx_buf[i + 2] = 0xFF;
} else {
tx_buf[i + 1] |= 0x07;
tx_buf[i + 2] = 0xFF;
}
i += 3;
}
ret = st->send(st->client, tx_buf, len);
if (ret < 0)
goto error_ret;
if (ret != len) {
ret = -EIO;
goto error_ret;
}
/*
* Now that we hopefully have sensible thresholds in place it is
* time to turn the interrupts on.
* It is unclear from the data sheet if this should be necessary
* (i.e. whether monitor mode setup is atomic) but it appears to
* be in practice.
*/
tx_buf[0] = st->setupbyte;
tx_buf[1] = MAX1363_MON_INT_ENABLE | (st->monitor_speed << 1) | 0xF0;
ret = st->send(st->client, tx_buf, 2);
if (ret < 0)
goto error_ret;
if (ret != 2) {
ret = -EIO;
goto error_ret;
}
ret = 0;
st->monitor_on = true;
error_ret:
kfree(tx_buf);
return ret;
}
/*
* To keep this manageable we always use one of 3 scan modes.
* Scan 0...3, 0-1,2-3 and 1-0,3-2
*/
static inline int __max1363_check_event_mask(int thismask, int checkmask)
{
int ret = 0;
/* Is it unipolar */
if (thismask < 4) {
if (checkmask & ~0x0F) {
ret = -EBUSY;
goto error_ret;
}
} else if (thismask < 6) {
if (checkmask & ~0x30) {
ret = -EBUSY;
goto error_ret;
}
} else if (checkmask & ~0xC0)
ret = -EBUSY;
error_ret:
return ret;
}
static int max1363_write_event_config(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan, enum iio_event_type type,
enum iio_event_direction dir, int state)
{
int ret = 0;
struct max1363_state *st = iio_priv(indio_dev);
u16 unifiedmask;
int number = chan->channel;
mutex_lock(&indio_dev->mlock);
unifiedmask = st->mask_low | st->mask_high;
if (dir == IIO_EV_DIR_FALLING) {
if (state == 0)
st->mask_low &= ~(1 << number);
else {
ret = __max1363_check_event_mask((1 << number),
unifiedmask);
if (ret)
goto error_ret;
st->mask_low |= (1 << number);
}
} else {
if (state == 0)
st->mask_high &= ~(1 << number);
else {
ret = __max1363_check_event_mask((1 << number),
unifiedmask);
if (ret)
goto error_ret;
st->mask_high |= (1 << number);
}
}
max1363_monitor_mode_update(st, !!(st->mask_high | st->mask_low));
error_ret:
mutex_unlock(&indio_dev->mlock);
return ret;
}
/*