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/*
* Driver for the Diolan DLN-2 USB-ADC adapter
*
* Copyright (c) 2017 Jack Andersen
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, version 2.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/platform_device.h>
#include <linux/mfd/dln2.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/trigger.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/iio/buffer.h>
#include <linux/iio/kfifo_buf.h>
#define DLN2_ADC_MOD_NAME "dln2-adc"
#define DLN2_ADC_ID 0x06
#define DLN2_ADC_GET_CHANNEL_COUNT DLN2_CMD(0x01, DLN2_ADC_ID)
#define DLN2_ADC_ENABLE DLN2_CMD(0x02, DLN2_ADC_ID)
#define DLN2_ADC_DISABLE DLN2_CMD(0x03, DLN2_ADC_ID)
#define DLN2_ADC_CHANNEL_ENABLE DLN2_CMD(0x05, DLN2_ADC_ID)
#define DLN2_ADC_CHANNEL_DISABLE DLN2_CMD(0x06, DLN2_ADC_ID)
#define DLN2_ADC_SET_RESOLUTION DLN2_CMD(0x08, DLN2_ADC_ID)
#define DLN2_ADC_CHANNEL_GET_VAL DLN2_CMD(0x0A, DLN2_ADC_ID)
#define DLN2_ADC_CHANNEL_GET_ALL_VAL DLN2_CMD(0x0B, DLN2_ADC_ID)
#define DLN2_ADC_CHANNEL_SET_CFG DLN2_CMD(0x0C, DLN2_ADC_ID)
#define DLN2_ADC_CHANNEL_GET_CFG DLN2_CMD(0x0D, DLN2_ADC_ID)
#define DLN2_ADC_CONDITION_MET_EV DLN2_CMD(0x10, DLN2_ADC_ID)
#define DLN2_ADC_EVENT_NONE 0
#define DLN2_ADC_EVENT_BELOW 1
#define DLN2_ADC_EVENT_LEVEL_ABOVE 2
#define DLN2_ADC_EVENT_OUTSIDE 3
#define DLN2_ADC_EVENT_INSIDE 4
#define DLN2_ADC_EVENT_ALWAYS 5
#define DLN2_ADC_MAX_CHANNELS 8
#define DLN2_ADC_DATA_BITS 10
/*
* Plays similar role to iio_demux_table in subsystem core; except allocated
* in a fixed 8-element array.
*/
struct dln2_adc_demux_table {
unsigned int from;
unsigned int to;
unsigned int length;
};
struct dln2_adc {
struct platform_device *pdev;
struct iio_chan_spec iio_channels[DLN2_ADC_MAX_CHANNELS + 1];
int port, trigger_chan;
struct iio_trigger *trig;
struct mutex mutex;
/* Cached sample period in milliseconds */
unsigned int sample_period;
/* Demux table */
unsigned int demux_count;
struct dln2_adc_demux_table demux[DLN2_ADC_MAX_CHANNELS];
/* Precomputed timestamp padding offset and length */
unsigned int ts_pad_offset, ts_pad_length;
};
struct dln2_adc_port_chan {
u8 port;
u8 chan;
};
struct dln2_adc_get_all_vals {
__le16 channel_mask;
__le16 values[DLN2_ADC_MAX_CHANNELS];
};
static void dln2_adc_add_demux(struct dln2_adc *dln2,
unsigned int in_loc, unsigned int out_loc,
unsigned int length)
{
struct dln2_adc_demux_table *p = dln2->demux_count ?
&dln2->demux[dln2->demux_count - 1] : NULL;
if (p && p->from + p->length == in_loc &&
p->to + p->length == out_loc) {
p->length += length;
} else if (dln2->demux_count < DLN2_ADC_MAX_CHANNELS) {
p = &dln2->demux[dln2->demux_count++];
p->from = in_loc;
p->to = out_loc;
p->length = length;
}
}
static void dln2_adc_update_demux(struct dln2_adc *dln2)
{
int in_ind = -1, out_ind;
unsigned int in_loc = 0, out_loc = 0;
struct iio_dev *indio_dev = platform_get_drvdata(dln2->pdev);
/* Clear out any old demux */
dln2->demux_count = 0;
/* Optimize all 8-channels case */
if (indio_dev->masklength &&
(*indio_dev->active_scan_mask & 0xff) == 0xff) {
dln2_adc_add_demux(dln2, 0, 0, 16);
dln2->ts_pad_offset = 0;
dln2->ts_pad_length = 0;
return;
}
/* Build demux table from fixed 8-channels to active_scan_mask */
for_each_set_bit(out_ind,
indio_dev->active_scan_mask,
indio_dev->masklength) {
/* Handle timestamp separately */
if (out_ind == DLN2_ADC_MAX_CHANNELS)
break;
for (++in_ind; in_ind != out_ind; ++in_ind)
in_loc += 2;
dln2_adc_add_demux(dln2, in_loc, out_loc, 2);
out_loc += 2;
in_loc += 2;
}
if (indio_dev->scan_timestamp) {
size_t ts_offset = indio_dev->scan_bytes / sizeof(int64_t) - 1;
dln2->ts_pad_offset = out_loc;
dln2->ts_pad_length = ts_offset * sizeof(int64_t) - out_loc;
} else {
dln2->ts_pad_offset = 0;
dln2->ts_pad_length = 0;
}
}
static int dln2_adc_get_chan_count(struct dln2_adc *dln2)
{
int ret;
u8 port = dln2->port;
u8 count;
int olen = sizeof(count);
ret = dln2_transfer(dln2->pdev, DLN2_ADC_GET_CHANNEL_COUNT,
&port, sizeof(port), &count, &olen);
if (ret < 0) {
dev_dbg(&dln2->pdev->dev, "Problem in %s\n", __func__);
return ret;
}
if (olen < sizeof(count))
return -EPROTO;
return count;
}
static int dln2_adc_set_port_resolution(struct dln2_adc *dln2)
{
int ret;
struct dln2_adc_port_chan port_chan = {
.port = dln2->port,
.chan = DLN2_ADC_DATA_BITS,
};
ret = dln2_transfer_tx(dln2->pdev, DLN2_ADC_SET_RESOLUTION,
&port_chan, sizeof(port_chan));
if (ret < 0)
dev_dbg(&dln2->pdev->dev, "Problem in %s\n", __func__);
return ret;
}
static int dln2_adc_set_chan_enabled(struct dln2_adc *dln2,
int channel, bool enable)
{
int ret;
struct dln2_adc_port_chan port_chan = {
.port = dln2->port,
.chan = channel,
};
u16 cmd = enable ? DLN2_ADC_CHANNEL_ENABLE : DLN2_ADC_CHANNEL_DISABLE;
ret = dln2_transfer_tx(dln2->pdev, cmd, &port_chan, sizeof(port_chan));
if (ret < 0)
dev_dbg(&dln2->pdev->dev, "Problem in %s\n", __func__);
return ret;
}
static int dln2_adc_set_port_enabled(struct dln2_adc *dln2, bool enable,
u16 *conflict_out)
{
int ret;
u8 port = dln2->port;
__le16 conflict;
int olen = sizeof(conflict);
u16 cmd = enable
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