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linux/drivers/iio/adc/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
*
* 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.
*
* - Control of internal reference.
*/
#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/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
*/
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;
};
#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_write_basic_config(struct i2c_client *client,
unsigned char d1,
unsigned char d2)
{
u8 tx_buf[2] = {d1, d2};
return i2c_master_send(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->client,
st->setupbyte,
st->configbyte);
}
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 = i2c_master_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 = i2c_master_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;
unsigned long scale_uv;
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:
scale_uv = st->vref_uv >> st->chip_info->bits;
*val = scale_uv / 1000;
*val2 = (scale_uv % 1000) * 1000;
return IIO_VAL_INT_PLUS_MICRO;
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,
};
#define MAX1363_EV_M \
(IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING) \
| IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING))
#define MAX1363_CHAN_U(num, addr, si, bits, evmask) \
{ \
.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_mask = evmask, \
}
/* bipolar channel */
#define MAX1363_CHAN_B(num, num2, addr, si, bits, evmask) \
{ \
.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_mask = evmask, \
}
#define MAX1363_4X_CHANS(bits, em) { \
MAX1363_CHAN_U(0, _s0, 0, bits, em), \
MAX1363_CHAN_U(1, _s1, 1, bits, em), \
MAX1363_CHAN_U(2, _s2, 2, bits, em), \
MAX1363_CHAN_U(3, _s3, 3, bits, em), \
MAX1363_CHAN_B(0, 1, d0m1, 4, bits, em), \
MAX1363_CHAN_B(2, 3, d2m3, 5, bits, em), \
MAX1363_CHAN_B(1, 0, d1m0, 6, bits, em), \
MAX1363_CHAN_B(3, 2, d3m2, 7, bits, em), \
IIO_CHAN_SOFT_TIMESTAMP(8) \
}
static const struct iio_chan_spec max1036_channels[] = MAX1363_4X_CHANS(8, 0);
static const struct iio_chan_spec max1136_channels[] = MAX1363_4X_CHANS(10, 0);
static const struct iio_chan_spec max1236_channels[] = MAX1363_4X_CHANS(12, 0);
static const struct iio_chan_spec max1361_channels[] =
MAX1363_4X_CHANS(10, MAX1363_EV_M);
static const struct iio_chan_spec max1363_channels[] =
MAX1363_4X_CHANS(12, MAX1363_EV_M);
/* 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, 0), \
MAX1363_CHAN_U(1, _s1, 1, bits, 0), \
MAX1363_CHAN_U(2, _s2, 2, bits, 0), \
MAX1363_CHAN_U(3, _s3, 3, bits, 0), \
MAX1363_CHAN_U(4, _s4, 4, bits, 0), \
MAX1363_CHAN_U(5, _s5, 5, bits, 0), \
MAX1363_CHAN_U(6, _s6, 6, bits, 0), \
MAX1363_CHAN_U(7, _s7, 7, bits, 0), \
MAX1363_CHAN_U(8, _s8, 8, bits, 0), \
MAX1363_CHAN_U(9, _s9, 9, bits, 0), \
MAX1363_CHAN_U(10, _s10, 10, bits, 0), \
MAX1363_CHAN_U(11, _s11, 11, bits, 0), \
MAX1363_CHAN_B(0, 1, d0m1, 12, bits, 0), \
MAX1363_CHAN_B(2, 3, d2m3, 13, bits, 0), \
MAX1363_CHAN_B(4, 5, d4m5, 14, bits, 0), \
MAX1363_CHAN_B(6, 7, d6m7, 15, bits, 0), \
MAX1363_CHAN_B(8, 9, d8m9, 16, bits, 0), \
MAX1363_CHAN_B(10, 11, d10m11, 17, bits, 0), \
MAX1363_CHAN_B(1, 0, d1m0, 18, bits, 0), \
MAX1363_CHAN_B(3, 2, d3m2, 19, bits, 0), \
MAX1363_CHAN_B(5, 4, d5m4, 20, bits, 0), \
MAX1363_CHAN_B(7, 6, d7m6, 21, bits, 0), \
MAX1363_CHAN_B(9, 8, d9m8, 22, bits, 0), \
MAX1363_CHAN_B(11, 10, d11m10, 23, bits, 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, 0), \
MAX1363_CHAN_U(1, _s1, 1, bits, 0), \
MAX1363_CHAN_U(2, _s2, 2, bits, 0), \
MAX1363_CHAN_U(3, _s3, 3, bits, 0), \
MAX1363_CHAN_U(4, _s4, 4, bits, 0), \
MAX1363_CHAN_U(5, _s5, 5, bits, 0), \
MAX1363_CHAN_U(6, _s6, 6, bits, 0), \
MAX1363_CHAN_U(7, _s7, 7, bits, 0), \
MAX1363_CHAN_B(0, 1, d0m1, 8, bits, 0), \
MAX1363_CHAN_B(2, 3, d2m3, 9, bits, 0), \
MAX1363_CHAN_B(4, 5, d4m5, 10, bits, 0), \
MAX1363_CHAN_B(6, 7, d6m7, 11, bits, 0), \
MAX1363_CHAN_B(1, 0, d1m0, 12, bits, 0), \
MAX1363_CHAN_B(3, 2, d3m2, 13, bits, 0), \
MAX1363_CHAN_B(5, 4, d5m4, 14, bits, 0), \
MAX1363_CHAN_B(7, 6, d7m6, 15, bits, 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, 0), \
MAX1363_CHAN_U(1, _s1, 1, bits, 0), \
MAX1363_CHAN_B(0, 1, d0m1, 2, bits, 0), \
MAX1363_CHAN_B(1, 0, d1m0, 3, bits, 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,
u64 event_code,
int *val)
{
struct max1363_state *st = iio_priv(indio_dev);
if (IIO_EVENT_CODE_EXTRACT_DIR(event_code) == IIO_EV_DIR_FALLING)
*val = st->thresh_low[IIO_EVENT_CODE_EXTRACT_CHAN(event_code)];
else
*val = st->thresh_high[IIO_EVENT_CODE_EXTRACT_CHAN(event_code)];
return 0;
}
static int max1363_write_thresh(struct iio_dev *indio_dev,
u64 event_code,
int val)
{
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 (IIO_EVENT_CODE_EXTRACT_DIR(event_code)) {
case IIO_EV_DIR_FALLING:
st->thresh_low[IIO_EVENT_CODE_EXTRACT_CHAN(event_code)] = val;
break;
case IIO_EV_DIR_RISING:
st->thresh_high[IIO_EVENT_CODE_EXTRACT_CHAN(event_code)] = val;
break;
}
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();
unsigned long mask, loc;
u8 rx;
u8 tx[2] = { st->setupbyte,
MAX1363_MON_INT_ENABLE | (st->monitor_speed << 1) | 0xF0 };
i2c_master_recv(st->client, &rx, 1);
mask = rx;
for_each_set_bit(loc, &mask, 8)
iio_push_event(indio_dev, max1363_event_codes[loc], timestamp);
i2c_master_send(st->client, tx, 2);
return IRQ_HANDLED;
}
static int max1363_read_event_config(struct iio_dev *indio_dev,
u64 event_code)
{
struct max1363_state *st = iio_priv(indio_dev);
int val;
int number = IIO_EVENT_CODE_EXTRACT_CHAN(event_code);
mutex_lock(&indio_dev->mlock);
if (IIO_EVENT_CODE_EXTRACT_DIR(event_code) == 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->client,
st->setupbyte,
st->configbyte);
}
/* 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 = i2c_master_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 = i2c_master_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,
u64 event_code,
int state)
{
int ret = 0;
struct max1363_state *st = iio_priv(indio_dev);
u16 unifiedmask;
int number = IIO_EVENT_CODE_EXTRACT_CHAN(event_code);
mutex_lock(&indio_dev->mlock);
unifiedmask = st->mask_low | st->mask_high;
if (IIO_EVENT_CODE_EXTRACT_DIR(event_code) == 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;
}
/*
* As with scan_elements, only certain sets of these can
* be combined.
*/
static struct attribute *max1363_event_attributes[] = {
&iio_dev_attr_sampling_frequency.dev_attr.attr,
&iio_const_attr_sampling_frequency_available.dev_attr.attr,
NULL,
};
static struct attribute_group max1363_event_attribute_group = {
.attrs = max1363_event_attributes,
.name = "events",
};
static int max1363_update_scan_mode(struct iio_dev *indio_dev,
const unsigned long *scan_mask)
{
struct max1363_state *st = iio_priv(indio_dev);
/*
* Need to figure out the current mode based upon the requested
* scan mask in iio_dev
*/
st->current_mode = max1363_match_mode(scan_mask, st->chip_info);
if (!st->current_mode)
return -EINVAL;
max1363_set_scan_mode(st);
return 0;
}
static const struct iio_info max1238_info = {
.read_raw = &max1363_read_raw,
.driver_module = THIS_MODULE,
.update_scan_mode = &max1363_update_scan_mode,
};
static const struct iio_info max1363_info = {
.read_event_value = &max1363_read_thresh,
.write_event_value = &max1363_write_thresh,
.read_event_config = &max1363_read_event_config,
.write_event_config = &max1363_write_event_config,
.read_raw = &max1363_read_raw,
.update_scan_mode = &max1363_update_scan_mode,
.driver_module = THIS_MODULE,
.event_attrs = &max1363_event_attribute_group,
};
/* max1363 and max1368 tested - rest from data sheet */
static const struct max1363_chip_info max1363_chip_info_tbl[] = {
[max1361] = {
.bits = 10,
.int_vref_mv = 2048,
.mode_list = max1363_mode_list,
.num_modes = ARRAY_SIZE(max1363_mode_list),
.default_mode = s0to3,
.channels = max1361_channels,
.num_channels = ARRAY_SIZE(max1361_channels),
.info = &max1363_info,
},
[max1362] = {
.bits = 10,
.int_vref_mv = 4096,
.mode_list = max1363_mode_list,
.num_modes = ARRAY_SIZE(max1363_mode_list),
.default_mode = s0to3,
.channels = max1361_channels,
.num_channels = ARRAY_SIZE(max1361_channels),
.info = &max1363_info,
},
[max1363] = {
.bits = 12,
.int_vref_mv = 2048,
.mode_list = max1363_mode_list,
.num_modes = ARRAY_SIZE(max1363_mode_list),
.default_mode = s0to3,
.channels = max1363_channels,
.num_channels = ARRAY_SIZE(max1363_channels),
.info = &max1363_info,
},
[max1364] = {
.bits = 12,
.int_vref_mv = 4096,
.mode_list = max1363_mode_list,
.num_modes = ARRAY_SIZE(max1363_mode_list),
.default_mode = s0to3,
.channels = max1363_channels,
.num_channels = ARRAY_SIZE(max1363_channels),
.info = &max1363_info,
},
[max1036] = {
.bits = 8,
.int_vref_mv = 4096,
.mode_list = max1236_mode_list,
.num_modes = ARRAY_SIZE(max1236_mode_list),
.default_mode = s0to3,
.info = &max1238_info,
.channels = max1036_channels,
.num_channels = ARRAY_SIZE(max1036_channels),
},
[max1037] = {
.bits = 8,
.int_vref_mv = 2048,
.mode_list = max1236_mode_list,
.num_modes = ARRAY_SIZE(max1236_mode_list),
.default_mode = s0to3,
.info = &max1238_info,
.channels = max1036_channels,
.num_channels = ARRAY_SIZE(max1036_channels),
},
[max1038] = {
.bits = 8,
.int_vref_mv = 4096,
.mode_list = max1238_mode_list,
.num_modes = ARRAY_SIZE(max1238_mode_list),
.default_mode = s0to11,
.info = &max1238_info,
.channels = max1038_channels,
.num_channels = ARRAY_SIZE(max1038_channels),
},
[max1039] = {
.bits = 8,
.int_vref_mv = 2048,
.mode_list = max1238_mode_list,
.num_modes = ARRAY_SIZE(max1238_mode_list),
.default_mode = s0to11,
.info = &max1238_info,
.channels = max1038_channels,
.num_channels = ARRAY_SIZE(max1038_channels),
},
[max1136] = {
.bits = 10,
.int_vref_mv = 4096,
.mode_list = max1236_mode_list,
.num_modes = ARRAY_SIZE(max1236_mode_list),
.default_mode = s0to3,
.info = &max1238_info,
.channels = max1136_channels,
.num_channels = ARRAY_SIZE(max1136_channels),
},
[max1137] = {
.bits = 10,
.int_vref_mv = 2048,
.mode_list = max1236_mode_list,
.num_modes = ARRAY_SIZE(max1236_mode_list),
.default_mode = s0to3,
.info = &max1238_info,
.channels = max1136_channels,
.num_channels = ARRAY_SIZE(max1136_channels),
},
[max1138] = {
.bits = 10,
.int_vref_mv = 4096,
.mode_list = max1238_mode_list,
.num_modes = ARRAY_SIZE(max1238_mode_list),
.default_mode = s0to11,
.info = &max1238_info,
.channels = max1138_channels,
.num_channels = ARRAY_SIZE(max1138_channels),
},
[max1139] = {
.bits = 10,
.int_vref_mv = 2048,
.mode_list = max1238_mode_list,
.num_modes = ARRAY_SIZE(max1238_mode_list),
.default_mode = s0to11,
.info = &max1238_info,
.channels = max1138_channels,
.num_channels = ARRAY_SIZE(max1138_channels),
},
[max1236] = {
.bits = 12,
.int_vref_mv = 4096,
.mode_list = max1236_mode_list,
.num_modes = ARRAY_SIZE(max1236_mode_list),
.default_mode = s0to3,
.info = &max1238_info,
.channels = max1236_channels,
.num_channels = ARRAY_SIZE(max1236_channels),
},
[max1237] = {
.bits = 12,
.int_vref_mv = 2048,
.mode_list = max1236_mode_list,
.num_modes = ARRAY_SIZE(max1236_mode_list),
.default_mode = s0to3,
.info = &max1238_info,
.channels = max1236_channels,
.num_channels = ARRAY_SIZE(max1236_channels),
},
[max1238] = {
.bits = 12,
.int_vref_mv = 4096,
.mode_list = max1238_mode_list,
.num_modes = ARRAY_SIZE(max1238_mode_list),
.default_mode = s0to11,
.info = &max1238_info,
.channels = max1238_channels,
.num_channels = ARRAY_SIZE(max1238_channels),
},
[max1239] = {
.bits = 12,
.int_vref_mv = 2048,
.mode_list = max1238_mode_list,
.num_modes = ARRAY_SIZE(max1238_mode_list),
.default_mode = s0to11,
.info = &max1238_info,
.channels = max1238_channels,
.num_channels = ARRAY_SIZE(max1238_channels),
},
[max11600] = {
.bits = 8,
.int_vref_mv = 4096,
.mode_list = max11607_mode_list,
.num_modes = ARRAY_SIZE(max11607_mode_list),
.default_mode = s0to3,
.info = &max1238_info,
.channels = max1036_channels,
.num_channels = ARRAY_SIZE(max1036_channels),
},
[max11601] = {
.bits = 8,
.int_vref_mv = 2048,
.mode_list = max11607_mode_list,
.num_modes = ARRAY_SIZE(max11607_mode_list),
.default_mode = s0to3,
.info = &max1238_info,
.channels = max1036_channels,
.num_channels = ARRAY_SIZE(max1036_channels),
},
[max11602] = {
.bits = 8,
.int_vref_mv = 4096,
.mode_list = max11608_mode_list,
.num_modes = ARRAY_SIZE(max11608_mode_list),
.default_mode = s0to7,
.info = &max1238_info,
.channels = max11602_channels,
.num_channels = ARRAY_SIZE(max11602_channels),
},
[max11603] = {
.bits = 8,
.int_vref_mv = 2048,
.mode_list = max11608_mode_list,
.num_modes = ARRAY_SIZE(max11608_mode_list),
.default_mode = s0to7,
.info = &max1238_info,
.channels = max11602_channels,
.num_channels = ARRAY_SIZE(max11602_channels),
},
[max11604] = {
.bits = 8,
.int_vref_mv = 4098,
.mode_list = max1238_mode_list,
.num_modes = ARRAY_SIZE(max1238_mode_list),
.default_mode = s0to11,
.info = &max1238_info,
.channels = max1238_channels,
.num_channels = ARRAY_SIZE(max1238_channels),
},
[max11605] = {
.bits = 8,
.int_vref_mv = 2048,
.mode_list = max1238_mode_list,
.num_modes = ARRAY_SIZE(max1238_mode_list),
.default_mode = s0to11,
.info = &max1238_info,
.channels = max1238_channels,
.num_channels = ARRAY_SIZE(max1238_channels),
},
[max11606] = {
.bits = 10,
.int_vref_mv = 4096,
.mode_list = max11607_mode_list,
.num_modes = ARRAY_SIZE(max11607_mode_list),
.default_mode = s0to3,
.info = &max1238_info,
.channels = max1136_channels,
.num_channels = ARRAY_SIZE(max1136_channels),
},
[max11607] = {
.bits = 10,
.int_vref_mv = 2048,
.mode_list = max11607_mode_list,
.num_modes = ARRAY_SIZE(max11607_mode_list),
.default_mode = s0to3,
.info = &max1238_info,
.channels = max1136_channels,
.num_channels = ARRAY_SIZE(max1136_channels),
},
[max11608] = {
.bits = 10,
.int_vref_mv = 4096,
.mode_list = max11608_mode_list,
.num_modes = ARRAY_SIZE(max11608_mode_list),
.default_mode = s0to7,
.info = &max1238_info,
.channels = max11608_channels,
.num_channels = ARRAY_SIZE(max11608_channels),
},
[max11609] = {
.bits = 10,
.int_vref_mv = 2048,
.mode_list = max11608_mode_list,
.num_modes = ARRAY_SIZE(max11608_mode_list),
.default_mode = s0to7,
.info = &max1238_info,
.channels = max11608_channels,
.num_channels = ARRAY_SIZE(max11608_channels),
},
[max11610] = {
.bits = 10,
.int_vref_mv = 4098,
.mode_list = max1238_mode_list,
.num_modes = ARRAY_SIZE(max1238_mode_list),
.default_mode = s0to11,
.info = &max1238_info,
.channels = max1238_channels,
.num_channels = ARRAY_SIZE(max1238_channels),
},
[max11611] = {
.bits = 10,
.int_vref_mv = 2048,
.mode_list = max1238_mode_list,
.num_modes = ARRAY_SIZE(max1238_mode_list),
.default_mode = s0to11,
.info = &max1238_info,
.channels = max1238_channels,
.num_channels = ARRAY_SIZE(max1238_channels),
},
[max11612] = {
.bits = 12,
.int_vref_mv = 4096,
.mode_list = max11607_mode_list,
.num_modes = ARRAY_SIZE(max11607_mode_list),
.default_mode = s0to3,
.info = &max1238_info,
.channels = max1363_channels,
.num_channels = ARRAY_SIZE(max1363_channels),
},
[max11613] = {
.bits = 12,
.int_vref_mv = 2048,
.mode_list = max11607_mode_list,
.num_modes = ARRAY_SIZE(max11607_mode_list),
.default_mode = s0to3,
.info = &max1238_info,
.channels = max1363_channels,
.num_channels = ARRAY_SIZE(max1363_channels),
},
[max11614] = {
.bits = 12,
.int_vref_mv = 4096,
.mode_list = max11608_mode_list,
.num_modes = ARRAY_SIZE(max11608_mode_list),
.default_mode = s0to7,
.info = &max1238_info,
.channels = max11614_channels,
.num_channels = ARRAY_SIZE(max11614_channels),
},
[max11615] = {
.bits = 12,
.int_vref_mv = 2048,
.mode_list = max11608_mode_list,
.num_modes = ARRAY_SIZE(max11608_mode_list),
.default_mode = s0to7,
.info = &max1238_info,
.channels = max11614_channels,
.num_channels = ARRAY_SIZE(max11614_channels),
},
[max11616] = {
.bits = 12,
.int_vref_mv = 4098,
.mode_list = max1238_mode_list,
.num_modes = ARRAY_SIZE(max1238_mode_list),
.default_mode = s0to11,
.info = &max1238_info,
.channels = max1238_channels,
.num_channels = ARRAY_SIZE(max1238_channels),
},
[max11617] = {
.bits = 12,
.int_vref_mv = 2048,
.mode_list = max1238_mode_list,
.num_modes = ARRAY_SIZE(max1238_mode_list),
.default_mode = s0to11,
.info = &max1238_info,
.channels = max1238_channels,
.num_channels = ARRAY_SIZE(max1238_channels),
},
[max11644] = {
.bits = 12,
.int_vref_mv = 2048,
.mode_list = max11644_mode_list,
.num_modes = ARRAY_SIZE(max11644_mode_list),
.default_mode = s0to1,
.info = &max1238_info,
.channels = max11644_channels,
.num_channels = ARRAY_SIZE(max11644_channels),
},
[max11645] = {
.bits = 12,
.int_vref_mv = 4096,
.mode_list = max11644_mode_list,
.num_modes = ARRAY_SIZE(max11644_mode_list),
.default_mode = s0to1,
.info = &max1238_info,
.channels = max11644_channels,
.num_channels = ARRAY_SIZE(max11644_channels),
},
[max11646] = {
.bits = 10,
.int_vref_mv = 2048,
.mode_list = max11644_mode_list,
.num_modes = ARRAY_SIZE(max11644_mode_list),
.default_mode = s0to1,
.info = &max1238_info,
.channels = max11646_channels,
.num_channels = ARRAY_SIZE(max11646_channels),
},
[max11647] = {
.bits = 10,
.int_vref_mv = 4096,
.mode_list = max11644_mode_list,
.num_modes = ARRAY_SIZE(max11644_mode_list),
.default_mode = s0to1,
.info = &max1238_info,
.channels = max11646_channels,
.num_channels = ARRAY_SIZE(max11646_channels),
},
};
static int max1363_initial_setup(struct max1363_state *st)
{
st->setupbyte = MAX1363_SETUP_INT_CLOCK
| MAX1363_SETUP_UNIPOLAR
| MAX1363_SETUP_NORESET;
if (st->vref)
st->setupbyte |= MAX1363_SETUP_AIN3_IS_REF_EXT_TO_REF;
else
st->setupbyte |= MAX1363_SETUP_POWER_UP_INT_REF
| MAX1363_SETUP_AIN3_IS_AIN3_REF_IS_INT;
/* 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 int max1363_alloc_scan_masks(struct iio_dev *indio_dev)
{
struct max1363_state *st = iio_priv(indio_dev);
unsigned long *masks;
int i;
masks = devm_kzalloc(&indio_dev->dev,
BITS_TO_LONGS(MAX1363_MAX_CHANNELS) * sizeof(long) *
(st->chip_info->num_modes + 1), GFP_KERNEL);
if (!masks)
return -ENOMEM;
for (i = 0; i < st->chip_info->num_modes; i++)
bitmap_copy(masks + BITS_TO_LONGS(MAX1363_MAX_CHANNELS)*i,
max1363_mode_table[st->chip_info->mode_list[i]]
.modemask, MAX1363_MAX_CHANNELS);
indio_dev->available_scan_masks = masks;
return 0;
}
static irqreturn_t max1363_trigger_handler(int irq, void *p)
{
struct iio_poll_func *pf = p;
struct iio_dev *indio_dev = pf->indio_dev;
struct max1363_state *st = iio_priv(indio_dev);
s64 time_ns;
__u8 *rxbuf;
int b_sent;
size_t d_size;
unsigned long numvals = bitmap_weight(st->current_mode->modemask,
MAX1363_MAX_CHANNELS);
/* Ensure the timestamp is 8 byte aligned */
if (st->chip_info->bits != 8)
d_size = numvals*2;
else
d_size = numvals;
if (indio_dev->scan_timestamp) {
d_size += sizeof(s64);
if (d_size % sizeof(s64))
d_size += sizeof(s64) - (d_size % sizeof(s64));
}
/* Monitor mode prevents reading. Whilst not currently implemented
* might as well have this test in here in the meantime as it does
* no harm.
*/
if (numvals == 0)
goto done;
rxbuf = kmalloc(d_size, GFP_KERNEL);
if (rxbuf == NULL)
goto done;
if (st->chip_info->bits != 8)
b_sent = i2c_master_recv(st->client, rxbuf, numvals*2);
else
b_sent = i2c_master_recv(st->client, rxbuf, numvals);
if (b_sent < 0)
goto done_free;
time_ns = iio_get_time_ns();
if (indio_dev->scan_timestamp)
memcpy(rxbuf + d_size - sizeof(s64), &time_ns, sizeof(time_ns));
iio_push_to_buffers(indio_dev, rxbuf);
done_free:
kfree(rxbuf);
done:
iio_trigger_notify_done(indio_dev->trig);
return IRQ_HANDLED;
}
static const struct iio_buffer_setup_ops max1363_buffered_setup_ops = {
.postenable = &iio_triggered_buffer_postenable,
.preenable = &iio_sw_buffer_preenable,
.predisable = &iio_triggered_buffer_predisable,
};
static int max1363_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
int ret;
struct max1363_state *st;
struct iio_dev *indio_dev;
struct regulator *vref;
indio_dev = devm_iio_device_alloc(&client->dev,
sizeof(struct max1363_state));
if (!indio_dev)
return -ENOMEM;
indio_dev->dev.of_node = client->dev.of_node;
ret = iio_map_array_register(indio_dev, client->dev.platform_data);
if (ret < 0)
return ret;
st = iio_priv(indio_dev);
st->reg = devm_regulator_get(&client->dev, "vcc");
if (IS_ERR(st->reg)) {
ret = PTR_ERR(st->reg);
goto error_unregister_map;
}
ret = regulator_enable(st->reg);
if (ret)
goto error_unregister_map;
/* this is only used for device removal purposes */
i2c_set_clientdata(client, indio_dev);
st->chip_info = &max1363_chip_info_tbl[id->driver_data];
st->client = client;
st->vref_uv = st->chip_info->int_vref_mv * 1000;
vref = devm_regulator_get(&client->dev, "vref");
if (!IS_ERR(vref)) {
int vref_uv;
ret = regulator_enable(vref);
if (ret)
goto error_disable_reg;
st->vref = vref;
vref_uv = regulator_get_voltage(vref);
if (vref_uv <= 0) {
ret = -EINVAL;
goto error_disable_reg;
}
st->vref_uv = vref_uv;
}
ret = max1363_alloc_scan_masks(indio_dev);
if (ret)
goto error_disable_reg;
/* Establish that the iio_dev is a child of the i2c device */
indio_dev->dev.parent = &client->dev;
indio_dev->name = id->name;
indio_dev->channels = st->chip_info->channels;
indio_dev->num_channels = st->chip_info->num_channels;
indio_dev->info = st->chip_info->info;
indio_dev->modes = INDIO_DIRECT_MODE;
ret = max1363_initial_setup(st);
if (ret < 0)
goto error_disable_reg;
ret = iio_triggered_buffer_setup(indio_dev, NULL,
&max1363_trigger_handler, &max1363_buffered_setup_ops);
if (ret)
goto error_disable_reg;
if (client->irq) {
ret = devm_request_threaded_irq(&client->dev, st->client->irq,
NULL,
&max1363_event_handler,
IRQF_TRIGGER_RISING | IRQF_ONESHOT,
"max1363_event",
indio_dev);
if (ret)
goto error_uninit_buffer;
}
ret = iio_device_register(indio_dev);
if (ret < 0)
goto error_uninit_buffer;
return 0;
error_uninit_buffer:
iio_triggered_buffer_cleanup(indio_dev);
error_disable_reg:
if (st->vref)
regulator_disable(st->vref);
regulator_disable(st->reg);
error_unregister_map:
iio_map_array_unregister(indio_dev);
return ret;
}
static int max1363_remove(struct i2c_client *client)
{
struct iio_dev *indio_dev = i2c_get_clientdata(client);
struct max1363_state *st = iio_priv(indio_dev);
iio_device_unregister(indio_dev);
iio_triggered_buffer_cleanup(indio_dev);
if (st->vref)
regulator_disable(st->vref);
regulator_disable(st->reg);
iio_map_array_unregister(indio_dev);
return 0;
}
static const struct i2c_device_id max1363_id[] = {
{ "max1361", max1361 },
{ "max1362", max1362 },
{ "max1363", max1363 },
{ "max1364", max1364 },
{ "max1036", max1036 },
{ "max1037", max1037 },
{ "max1038", max1038 },
{ "max1039", max1039 },
{ "max1136", max1136 },
{ "max1137", max1137 },
{ "max1138", max1138 },
{ "max1139", max1139 },
{ "max1236", max1236 },
{ "max1237", max1237 },
{ "max1238", max1238 },
{ "max1239", max1239 },
{ "max11600", max11600 },
{ "max11601", max11601 },
{ "max11602", max11602 },
{ "max11603", max11603 },
{ "max11604", max11604 },
{ "max11605", max11605 },
{ "max11606", max11606 },
{ "max11607", max11607 },
{ "max11608", max11608 },
{ "max11609", max11609 },
{ "max11610", max11610 },
{ "max11611", max11611 },
{ "max11612", max11612 },
{ "max11613", max11613 },
{ "max11614", max11614 },
{ "max11615", max11615 },
{ "max11616", max11616 },
{ "max11617", max11617 },
{}
};
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,
};
module_i2c_driver(max1363_driver);
MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
MODULE_DESCRIPTION("Maxim 1363 ADC");
MODULE_LICENSE("GPL v2");
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