570 lines
15 KiB
C
570 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright 2021 Google LLC.
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*
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* Common part of most Semtech SAR sensor.
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*/
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#include <linux/bitops.h>
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#include <linux/byteorder/generic.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/export.h>
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#include <linux/interrupt.h>
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#include <linux/irqreturn.h>
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#include <linux/i2c.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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#include <linux/regulator/consumer.h>
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#include <vdso/bits.h>
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#include <linux/iio/buffer.h>
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#include <linux/iio/events.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/trigger.h>
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#include <linux/iio/triggered_buffer.h>
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#include <linux/iio/trigger_consumer.h>
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#include "sx_common.h"
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/* All Semtech SAR sensors have IRQ bit in the same order. */
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#define SX_COMMON_CONVDONE_IRQ BIT(0)
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#define SX_COMMON_FAR_IRQ BIT(2)
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#define SX_COMMON_CLOSE_IRQ BIT(3)
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const struct iio_event_spec sx_common_events[3] = {
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{
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.type = IIO_EV_TYPE_THRESH,
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.dir = IIO_EV_DIR_RISING,
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.mask_shared_by_all = BIT(IIO_EV_INFO_PERIOD),
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},
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{
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.type = IIO_EV_TYPE_THRESH,
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.dir = IIO_EV_DIR_FALLING,
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.mask_shared_by_all = BIT(IIO_EV_INFO_PERIOD),
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},
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{
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.type = IIO_EV_TYPE_THRESH,
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.dir = IIO_EV_DIR_EITHER,
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.mask_separate = BIT(IIO_EV_INFO_ENABLE) |
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BIT(IIO_EV_INFO_HYSTERESIS) |
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BIT(IIO_EV_INFO_VALUE),
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},
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};
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EXPORT_SYMBOL_NS_GPL(sx_common_events, SEMTECH_PROX);
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static irqreturn_t sx_common_irq_handler(int irq, void *private)
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{
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struct iio_dev *indio_dev = private;
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struct sx_common_data *data = iio_priv(indio_dev);
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if (data->trigger_enabled)
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iio_trigger_poll(data->trig);
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/*
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* Even if no event is enabled, we need to wake the thread to clear the
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* interrupt state by reading SX_COMMON_REG_IRQ_SRC.
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* It is not possible to do that here because regmap_read takes a mutex.
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*/
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return IRQ_WAKE_THREAD;
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}
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static void sx_common_push_events(struct iio_dev *indio_dev)
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{
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int ret;
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unsigned int val, chan;
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struct sx_common_data *data = iio_priv(indio_dev);
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s64 timestamp = iio_get_time_ns(indio_dev);
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unsigned long prox_changed;
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/* Read proximity state on all channels */
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ret = regmap_read(data->regmap, data->chip_info->reg_stat, &val);
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if (ret) {
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dev_err(&data->client->dev, "i2c transfer error in irq\n");
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return;
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}
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val >>= data->chip_info->stat_offset;
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/*
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* Only iterate over channels with changes on proximity status that have
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* events enabled.
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*/
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prox_changed = (data->chan_prox_stat ^ val) & data->chan_event;
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for_each_set_bit(chan, &prox_changed, data->chip_info->num_channels) {
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int dir;
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u64 ev;
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dir = (val & BIT(chan)) ? IIO_EV_DIR_FALLING : IIO_EV_DIR_RISING;
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ev = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, chan,
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IIO_EV_TYPE_THRESH, dir);
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iio_push_event(indio_dev, ev, timestamp);
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}
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data->chan_prox_stat = val;
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}
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static int sx_common_enable_irq(struct sx_common_data *data, unsigned int irq)
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{
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if (!data->client->irq)
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return 0;
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return regmap_update_bits(data->regmap, data->chip_info->reg_irq_msk,
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irq << data->chip_info->irq_msk_offset,
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irq << data->chip_info->irq_msk_offset);
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}
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static int sx_common_disable_irq(struct sx_common_data *data, unsigned int irq)
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{
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if (!data->client->irq)
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return 0;
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return regmap_update_bits(data->regmap, data->chip_info->reg_irq_msk,
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irq << data->chip_info->irq_msk_offset, 0);
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}
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static int sx_common_update_chan_en(struct sx_common_data *data,
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unsigned long chan_read,
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unsigned long chan_event)
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{
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int ret;
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unsigned long channels = chan_read | chan_event;
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if ((data->chan_read | data->chan_event) != channels) {
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ret = regmap_update_bits(data->regmap,
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data->chip_info->reg_enable_chan,
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data->chip_info->mask_enable_chan,
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channels);
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if (ret)
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return ret;
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}
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data->chan_read = chan_read;
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data->chan_event = chan_event;
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return 0;
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}
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static int sx_common_get_read_channel(struct sx_common_data *data, int channel)
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{
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return sx_common_update_chan_en(data, data->chan_read | BIT(channel),
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data->chan_event);
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}
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static int sx_common_put_read_channel(struct sx_common_data *data, int channel)
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{
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return sx_common_update_chan_en(data, data->chan_read & ~BIT(channel),
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data->chan_event);
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}
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static int sx_common_get_event_channel(struct sx_common_data *data, int channel)
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{
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return sx_common_update_chan_en(data, data->chan_read,
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data->chan_event | BIT(channel));
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}
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static int sx_common_put_event_channel(struct sx_common_data *data, int channel)
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{
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return sx_common_update_chan_en(data, data->chan_read,
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data->chan_event & ~BIT(channel));
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}
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/**
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* sx_common_read_proximity() - Read raw proximity value.
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* @data: Internal data
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* @chan: Channel to read
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* @val: pointer to return read value.
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*
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* Request a conversion, wait for the sensor to be ready and
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* return the raw proximity value.
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*/
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int sx_common_read_proximity(struct sx_common_data *data,
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const struct iio_chan_spec *chan, int *val)
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{
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int ret;
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__be16 rawval;
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mutex_lock(&data->mutex);
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ret = sx_common_get_read_channel(data, chan->channel);
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if (ret)
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goto out;
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ret = sx_common_enable_irq(data, SX_COMMON_CONVDONE_IRQ);
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if (ret)
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goto out_put_channel;
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mutex_unlock(&data->mutex);
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if (data->client->irq) {
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ret = wait_for_completion_interruptible(&data->completion);
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reinit_completion(&data->completion);
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} else {
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ret = data->chip_info->ops.wait_for_sample(data);
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}
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mutex_lock(&data->mutex);
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if (ret)
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goto out_disable_irq;
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ret = data->chip_info->ops.read_prox_data(data, chan, &rawval);
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if (ret)
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goto out_disable_irq;
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*val = sign_extend32(be16_to_cpu(rawval), chan->scan_type.realbits - 1);
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ret = sx_common_disable_irq(data, SX_COMMON_CONVDONE_IRQ);
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if (ret)
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goto out_put_channel;
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ret = sx_common_put_read_channel(data, chan->channel);
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if (ret)
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goto out;
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mutex_unlock(&data->mutex);
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return IIO_VAL_INT;
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out_disable_irq:
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sx_common_disable_irq(data, SX_COMMON_CONVDONE_IRQ);
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out_put_channel:
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sx_common_put_read_channel(data, chan->channel);
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out:
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mutex_unlock(&data->mutex);
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return ret;
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}
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EXPORT_SYMBOL_NS_GPL(sx_common_read_proximity, SEMTECH_PROX);
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/**
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* sx_common_read_event_config() - Configure event setting.
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* @indio_dev: iio device object
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* @chan: Channel to read
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* @type: Type of event (unused)
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* @dir: Direction of event (unused)
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*
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* return if the given channel is used for event gathering.
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*/
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int sx_common_read_event_config(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan,
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enum iio_event_type type,
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enum iio_event_direction dir)
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{
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struct sx_common_data *data = iio_priv(indio_dev);
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return !!(data->chan_event & BIT(chan->channel));
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}
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EXPORT_SYMBOL_NS_GPL(sx_common_read_event_config, SEMTECH_PROX);
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/**
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* sx_common_write_event_config() - Configure event setting.
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* @indio_dev: iio device object
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* @chan: Channel to enable
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* @type: Type of event (unused)
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* @dir: Direction of event (unused)
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* @state: State of the event.
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*
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* Enable/Disable event on a given channel.
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*/
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int sx_common_write_event_config(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan,
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enum iio_event_type type,
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enum iio_event_direction dir, int state)
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{
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struct sx_common_data *data = iio_priv(indio_dev);
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unsigned int eventirq = SX_COMMON_FAR_IRQ | SX_COMMON_CLOSE_IRQ;
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int ret;
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/* If the state hasn't changed, there's nothing to do. */
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if (!!(data->chan_event & BIT(chan->channel)) == state)
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return 0;
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mutex_lock(&data->mutex);
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if (state) {
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ret = sx_common_get_event_channel(data, chan->channel);
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if (ret)
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goto out_unlock;
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if (!(data->chan_event & ~BIT(chan->channel))) {
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ret = sx_common_enable_irq(data, eventirq);
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if (ret)
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sx_common_put_event_channel(data, chan->channel);
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}
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} else {
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ret = sx_common_put_event_channel(data, chan->channel);
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if (ret)
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goto out_unlock;
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if (!data->chan_event) {
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ret = sx_common_disable_irq(data, eventirq);
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if (ret)
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sx_common_get_event_channel(data, chan->channel);
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}
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}
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out_unlock:
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mutex_unlock(&data->mutex);
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return ret;
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}
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EXPORT_SYMBOL_NS_GPL(sx_common_write_event_config, SEMTECH_PROX);
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static int sx_common_set_trigger_state(struct iio_trigger *trig, bool state)
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{
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struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
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struct sx_common_data *data = iio_priv(indio_dev);
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int ret = 0;
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mutex_lock(&data->mutex);
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if (state)
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ret = sx_common_enable_irq(data, SX_COMMON_CONVDONE_IRQ);
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else if (!data->chan_read)
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ret = sx_common_disable_irq(data, SX_COMMON_CONVDONE_IRQ);
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if (ret)
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goto out;
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data->trigger_enabled = state;
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out:
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mutex_unlock(&data->mutex);
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return ret;
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}
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static const struct iio_trigger_ops sx_common_trigger_ops = {
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.set_trigger_state = sx_common_set_trigger_state,
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};
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static irqreturn_t sx_common_irq_thread_handler(int irq, void *private)
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{
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struct iio_dev *indio_dev = private;
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struct sx_common_data *data = iio_priv(indio_dev);
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int ret;
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unsigned int val;
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mutex_lock(&data->mutex);
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ret = regmap_read(data->regmap, SX_COMMON_REG_IRQ_SRC, &val);
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if (ret) {
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dev_err(&data->client->dev, "i2c transfer error in irq\n");
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goto out;
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}
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if (val & ((SX_COMMON_FAR_IRQ | SX_COMMON_CLOSE_IRQ) << data->chip_info->irq_msk_offset))
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sx_common_push_events(indio_dev);
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if (val & (SX_COMMON_CONVDONE_IRQ << data->chip_info->irq_msk_offset))
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complete(&data->completion);
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out:
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mutex_unlock(&data->mutex);
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return IRQ_HANDLED;
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}
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static irqreturn_t sx_common_trigger_handler(int irq, void *private)
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{
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struct iio_poll_func *pf = private;
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struct iio_dev *indio_dev = pf->indio_dev;
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struct sx_common_data *data = iio_priv(indio_dev);
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__be16 val;
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int bit, ret, i = 0;
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mutex_lock(&data->mutex);
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for_each_set_bit(bit, indio_dev->active_scan_mask,
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indio_dev->masklength) {
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ret = data->chip_info->ops.read_prox_data(data,
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&indio_dev->channels[bit],
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&val);
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if (ret)
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goto out;
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data->buffer.channels[i++] = val;
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}
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iio_push_to_buffers_with_timestamp(indio_dev, &data->buffer,
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pf->timestamp);
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out:
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mutex_unlock(&data->mutex);
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iio_trigger_notify_done(indio_dev->trig);
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return IRQ_HANDLED;
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}
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static int sx_common_buffer_preenable(struct iio_dev *indio_dev)
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{
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struct sx_common_data *data = iio_priv(indio_dev);
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unsigned long channels = 0;
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int bit, ret;
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mutex_lock(&data->mutex);
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for_each_set_bit(bit, indio_dev->active_scan_mask,
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indio_dev->masklength)
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__set_bit(indio_dev->channels[bit].channel, &channels);
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ret = sx_common_update_chan_en(data, channels, data->chan_event);
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mutex_unlock(&data->mutex);
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return ret;
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}
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static int sx_common_buffer_postdisable(struct iio_dev *indio_dev)
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{
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struct sx_common_data *data = iio_priv(indio_dev);
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int ret;
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mutex_lock(&data->mutex);
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ret = sx_common_update_chan_en(data, 0, data->chan_event);
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mutex_unlock(&data->mutex);
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return ret;
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}
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static const struct iio_buffer_setup_ops sx_common_buffer_setup_ops = {
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.preenable = sx_common_buffer_preenable,
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.postdisable = sx_common_buffer_postdisable,
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};
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static void sx_common_regulator_disable(void *_data)
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{
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struct sx_common_data *data = _data;
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regulator_bulk_disable(ARRAY_SIZE(data->supplies), data->supplies);
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}
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#define SX_COMMON_SOFT_RESET 0xde
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static int sx_common_init_device(struct device *dev, struct iio_dev *indio_dev)
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{
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struct sx_common_data *data = iio_priv(indio_dev);
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struct sx_common_reg_default tmp;
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const struct sx_common_reg_default *initval;
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int ret;
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unsigned int i, val;
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ret = regmap_write(data->regmap, data->chip_info->reg_reset,
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SX_COMMON_SOFT_RESET);
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if (ret)
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return ret;
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usleep_range(1000, 2000); /* power-up time is ~1ms. */
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/* Clear reset interrupt state by reading SX_COMMON_REG_IRQ_SRC. */
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ret = regmap_read(data->regmap, SX_COMMON_REG_IRQ_SRC, &val);
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if (ret)
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return ret;
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/* Program defaults from constant or BIOS. */
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for (i = 0; i < data->chip_info->num_default_regs; i++) {
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initval = data->chip_info->ops.get_default_reg(dev, i, &tmp);
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ret = regmap_write(data->regmap, initval->reg, initval->def);
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if (ret)
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return ret;
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}
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return data->chip_info->ops.init_compensation(indio_dev);
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}
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/**
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* sx_common_probe() - Common setup for Semtech SAR sensor
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* @client: I2C client object
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* @chip_info: Semtech sensor chip information.
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* @regmap_config: Sensor registers map configuration.
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*/
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int sx_common_probe(struct i2c_client *client,
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const struct sx_common_chip_info *chip_info,
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const struct regmap_config *regmap_config)
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{
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struct device *dev = &client->dev;
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struct iio_dev *indio_dev;
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struct sx_common_data *data;
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int ret;
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indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
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if (!indio_dev)
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return -ENOMEM;
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data = iio_priv(indio_dev);
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data->chip_info = chip_info;
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data->client = client;
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data->supplies[0].supply = "vdd";
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data->supplies[1].supply = "svdd";
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mutex_init(&data->mutex);
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init_completion(&data->completion);
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data->regmap = devm_regmap_init_i2c(client, regmap_config);
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if (IS_ERR(data->regmap))
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return dev_err_probe(dev, PTR_ERR(data->regmap),
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"Could init register map\n");
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ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(data->supplies),
|
|
data->supplies);
|
|
if (ret)
|
|
return dev_err_probe(dev, ret, "Unable to get regulators\n");
|
|
|
|
ret = regulator_bulk_enable(ARRAY_SIZE(data->supplies), data->supplies);
|
|
if (ret)
|
|
return dev_err_probe(dev, ret, "Unable to enable regulators\n");
|
|
|
|
/* Must wait for Tpor time after initial power up */
|
|
usleep_range(1000, 1100);
|
|
|
|
ret = devm_add_action_or_reset(dev, sx_common_regulator_disable, data);
|
|
if (ret)
|
|
return dev_err_probe(dev, ret,
|
|
"Unable to register regulators deleter\n");
|
|
|
|
ret = data->chip_info->ops.check_whoami(dev, indio_dev);
|
|
if (ret)
|
|
return dev_err_probe(dev, ret, "error reading WHOAMI\n");
|
|
|
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
|
|
|
indio_dev->channels = data->chip_info->iio_channels;
|
|
indio_dev->num_channels = data->chip_info->num_iio_channels;
|
|
indio_dev->info = &data->chip_info->iio_info;
|
|
|
|
i2c_set_clientdata(client, indio_dev);
|
|
|
|
ret = sx_common_init_device(dev, indio_dev);
|
|
if (ret)
|
|
return dev_err_probe(dev, ret, "Unable to initialize sensor\n");
|
|
|
|
if (client->irq) {
|
|
ret = devm_request_threaded_irq(dev, client->irq,
|
|
sx_common_irq_handler,
|
|
sx_common_irq_thread_handler,
|
|
IRQF_ONESHOT,
|
|
"sx_event", indio_dev);
|
|
if (ret)
|
|
return dev_err_probe(dev, ret, "No IRQ\n");
|
|
|
|
data->trig = devm_iio_trigger_alloc(dev, "%s-dev%d",
|
|
indio_dev->name,
|
|
iio_device_id(indio_dev));
|
|
if (!data->trig)
|
|
return -ENOMEM;
|
|
|
|
data->trig->ops = &sx_common_trigger_ops;
|
|
iio_trigger_set_drvdata(data->trig, indio_dev);
|
|
|
|
ret = devm_iio_trigger_register(dev, data->trig);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
ret = devm_iio_triggered_buffer_setup(dev, indio_dev,
|
|
iio_pollfunc_store_time,
|
|
sx_common_trigger_handler,
|
|
&sx_common_buffer_setup_ops);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return devm_iio_device_register(dev, indio_dev);
|
|
}
|
|
EXPORT_SYMBOL_NS_GPL(sx_common_probe, SEMTECH_PROX);
|
|
|
|
MODULE_AUTHOR("Gwendal Grignou <gwendal@chromium.org>");
|
|
MODULE_DESCRIPTION("Common functions and structures for Semtech sensor");
|
|
MODULE_LICENSE("GPL v2");
|