Merge tag 'staging-4.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging

Pull staging/IIO updates from Greg KH:
 "Here's the large set of staging and iio driver patches for 4.13-rc1.

  After over 500 patches, we removed about 200 more lines of code than
  we added, not great, but we added some new IIO drivers for unsupported
  hardware, so it's an overall win.

  Also here are lots of small fixes, and some tty core api additions
  (with the tty maintainer's ack) for the speakup drivers, those are
  finally getting some much needed cleanups and are looking much better
  now than before. Full details in the shortlog.

  All of these have been in linux-next for a while with no reported
  issues"

* tag 'staging-4.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging: (529 commits)
  staging: lustre: replace kmalloc with kmalloc_array
  Staging: ion: fix code style warning from NULL comparisons
  staging: fsl-mc: make dprc.h header private
  staging: fsl-mc: move mc-cmd.h contents in the public header
  staging: fsl-mc: move mc-sys.h contents in the public header
  staging: fsl-mc: fix a few implicit includes
  staging: fsl-mc: remove dpmng API files
  staging: fsl-mc: move rest of mc-bus.h to private header
  staging: fsl-mc: move couple of definitions to public header
  staging: fsl-mc: move irq domain creation prototype to public header
  staging: fsl-mc: turn several exported functions static
  staging: fsl-mc: delete prototype of unimplemented function
  staging: fsl-mc: delete duplicated function prototypes
  staging: fsl-mc: decouple the mc-bus public headers from dprc.h
  staging: fsl-mc: drop useless #includes
  staging: fsl-mc: be consistent when checking strcmp() return
  staging: fsl-mc: move comparison before strcmp() call
  staging: speakup: make function ser_to_dev static
  staging: ks7010: fix spelling mistake: "errror" -> "error"
  staging: rtl8192e: fix spelling mistake: "respose" -> "response"
  ...

1 files changed, 275 insertions, 0 deletions

diff --git a/drivers/iio/adc/ti-adc084s021.c b/drivers/iio/adc/ti-adc084s021.c
new file mode 100644
index 000000000000..a355121c11a4
--- /dev/null
+++ b/drivers/iio/adc/ti-adc084s021.c
@@ -0,0 +1,275 @@
+/**
+ * Copyright (C) 2017 Axis Communications AB
+ *
+ * Driver for Texas Instruments' ADC084S021 ADC chip.
+ * Datasheets can be found here:
+ * http://www.ti.com/lit/ds/symlink/adc084s021.pdf
+ *
+ * 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/err.h>
+#include <linux/spi/spi.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/triggered_buffer.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/regulator/consumer.h>
+
+#define ADC084S021_DRIVER_NAME "adc084s021"
+
+struct adc084s021 {
+	struct spi_device *spi;
+	struct spi_message message;
+	struct spi_transfer spi_trans;
+	struct regulator *reg;
+	struct mutex lock;
+	/*
+	 * DMA (thus cache coherency maintenance) requires the
+	 * transfer buffers to live in their own cache line.
+	 */
+	u16 tx_buf[4] ____cacheline_aligned;
+	__be16 rx_buf[5]; /* First 16-bits are trash */
+};
+
+#define ADC084S021_VOLTAGE_CHANNEL(num)                  \
+	{                                                      \
+		.type = IIO_VOLTAGE,                                 \
+		.channel = (num),                                    \
+		.indexed = 1,                                        \
+		.scan_index = (num),                                 \
+		.scan_type = {                                       \
+			.sign = 'u',                                       \
+			.realbits = 8,                                     \
+			.storagebits = 16,                                 \
+			.shift = 4,                                        \
+			.endianness = IIO_BE,                              \
+		},                                                   \
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),        \
+		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),\
+	}
+
+static const struct iio_chan_spec adc084s021_channels[] = {
+	ADC084S021_VOLTAGE_CHANNEL(0),
+	ADC084S021_VOLTAGE_CHANNEL(1),
+	ADC084S021_VOLTAGE_CHANNEL(2),
+	ADC084S021_VOLTAGE_CHANNEL(3),
+	IIO_CHAN_SOFT_TIMESTAMP(4),
+};
+
+/**
+ * Read an ADC channel and return its value.
+ *
+ * @adc: The ADC SPI data.
+ * @data: Buffer for converted data.
+ */
+static int adc084s021_adc_conversion(struct adc084s021 *adc, void *data)
+{
+	int n_words = (adc->spi_trans.len >> 1) - 1; /* Discard first word */
+	int ret, i = 0;
+	u16 *p = data;
+
+	/* Do the transfer */
+	ret = spi_sync(adc->spi, &adc->message);
+	if (ret < 0)
+		return ret;
+
+	for (; i < n_words; i++)
+		*(p + i) = adc->rx_buf[i + 1];
+
+	return ret;
+}
+
+static int adc084s021_read_raw(struct iio_dev *indio_dev,
+			   struct iio_chan_spec const *channel, int *val,
+			   int *val2, long mask)
+{
+	struct adc084s021 *adc = iio_priv(indio_dev);
+	int ret;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		ret = iio_device_claim_direct_mode(indio_dev);
+		if (ret < 0)
+			return ret;
+
+		ret = regulator_enable(adc->reg);
+		if (ret) {
+			iio_device_release_direct_mode(indio_dev);
+			return ret;
+		}
+
+		adc->tx_buf[0] = channel->channel << 3;
+		ret = adc084s021_adc_conversion(adc, val);
+		iio_device_release_direct_mode(indio_dev);
+		regulator_disable(adc->reg);
+		if (ret < 0)
+			return ret;
+
+		*val = be16_to_cpu(*val);
+		*val = (*val >> channel->scan_type.shift) & 0xff;
+
+		return IIO_VAL_INT;
+	case IIO_CHAN_INFO_SCALE:
+		ret = regulator_enable(adc->reg);
+		if (ret)
+			return ret;
+
+		ret = regulator_get_voltage(adc->reg);
+		regulator_disable(adc->reg);
+		if (ret < 0)
+			return ret;
+
+		*val = ret / 1000;
+
+		return IIO_VAL_INT;
+	default:
+		return -EINVAL;
+	}
+}
+
+/**
+ * Read enabled ADC channels and push data to the buffer.
+ *
+ * @irq: The interrupt number (not used).
+ * @pollfunc: Pointer to the poll func.
+ */
+static irqreturn_t adc084s021_buffer_trigger_handler(int irq, void *pollfunc)
+{
+	struct iio_poll_func *pf = pollfunc;
+	struct iio_dev *indio_dev = pf->indio_dev;
+	struct adc084s021 *adc = iio_priv(indio_dev);
+	__be16 data[8] = {0}; /* 4 * 16-bit words of data + 8 bytes timestamp */
+
+	mutex_lock(&adc->lock);
+
+	if (adc084s021_adc_conversion(adc, &data) < 0)
+		dev_err(&adc->spi->dev, "Failed to read data\n");
+
+	iio_push_to_buffers_with_timestamp(indio_dev, data,
+					   iio_get_time_ns(indio_dev));
+	mutex_unlock(&adc->lock);
+	iio_trigger_notify_done(indio_dev->trig);
+
+	return IRQ_HANDLED;
+}
+
+static int adc084s021_buffer_preenable(struct iio_dev *indio_dev)
+{
+	struct adc084s021 *adc = iio_priv(indio_dev);
+	int scan_index;
+	int i = 0;
+
+	for_each_set_bit(scan_index, indio_dev->active_scan_mask,
+			 indio_dev->masklength) {
+		const struct iio_chan_spec *channel =
+			&indio_dev->channels[scan_index];
+		adc->tx_buf[i++] = channel->channel << 3;
+	}
+	adc->spi_trans.len = 2 + (i * sizeof(__be16)); /* Trash + channels */
+
+	return regulator_enable(adc->reg);
+}
+
+static int adc084s021_buffer_postdisable(struct iio_dev *indio_dev)
+{
+	struct adc084s021 *adc = iio_priv(indio_dev);
+
+	adc->spi_trans.len = 4; /* Trash + single channel */
+
+	return regulator_disable(adc->reg);
+}
+
+static const struct iio_info adc084s021_info = {
+	.read_raw = adc084s021_read_raw,
+	.driver_module = THIS_MODULE,
+};
+
+static const struct iio_buffer_setup_ops adc084s021_buffer_setup_ops = {
+	.preenable = adc084s021_buffer_preenable,
+	.postenable = iio_triggered_buffer_postenable,
+	.predisable = iio_triggered_buffer_predisable,
+	.postdisable = adc084s021_buffer_postdisable,
+};
+
+static int adc084s021_probe(struct spi_device *spi)
+{
+	struct iio_dev *indio_dev;
+	struct adc084s021 *adc;
+	int ret;
+
+	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*adc));
+	if (!indio_dev) {
+		dev_err(&spi->dev, "Failed to allocate IIO device\n");
+		return -ENOMEM;
+	}
+
+	adc = iio_priv(indio_dev);
+	adc->spi = spi;
+
+	/* Connect the SPI device and the iio dev */
+	spi_set_drvdata(spi, indio_dev);
+
+	/* Initiate the Industrial I/O device */
+	indio_dev->dev.parent = &spi->dev;
+	indio_dev->dev.of_node = spi->dev.of_node;
+	indio_dev->name = spi_get_device_id(spi)->name;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->info = &adc084s021_info;
+	indio_dev->channels = adc084s021_channels;
+	indio_dev->num_channels = ARRAY_SIZE(adc084s021_channels);
+
+	/* Create SPI transfer for channel reads */
+	adc->spi_trans.tx_buf = adc->tx_buf;
+	adc->spi_trans.rx_buf = adc->rx_buf;
+	adc->spi_trans.len = 4; /* Trash + single channel */
+	spi_message_init_with_transfers(&adc->message, &adc->spi_trans, 1);
+
+	adc->reg = devm_regulator_get(&spi->dev, "vref");
+	if (IS_ERR(adc->reg))
+		return PTR_ERR(adc->reg);
+
+	mutex_init(&adc->lock);
+
+	/* Setup triggered buffer with pollfunction */
+	ret = devm_iio_triggered_buffer_setup(&spi->dev, indio_dev, NULL,
+					    adc084s021_buffer_trigger_handler,
+					    &adc084s021_buffer_setup_ops);
+	if (ret) {
+		dev_err(&spi->dev, "Failed to setup triggered buffer\n");
+		return ret;
+	}
+
+	return devm_iio_device_register(&spi->dev, indio_dev);
+}
+
+static const struct of_device_id adc084s021_of_match[] = {
+	{ .compatible = "ti,adc084s021", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, adc084s021_of_match);
+
+static const struct spi_device_id adc084s021_id[] = {
+	{ ADC084S021_DRIVER_NAME, 0},
+	{}
+};
+MODULE_DEVICE_TABLE(spi, adc084s021_id);
+
+static struct spi_driver adc084s021_driver = {
+	.driver = {
+		.name = ADC084S021_DRIVER_NAME,
+		.of_match_table = of_match_ptr(adc084s021_of_match),
+	},
+	.probe = adc084s021_probe,
+	.id_table = adc084s021_id,
+};
+module_spi_driver(adc084s021_driver);
+
+MODULE_AUTHOR("Mårten Lindahl <martenli@axis.com>");
+MODULE_DESCRIPTION("Texas Instruments ADC084S021");
+MODULE_LICENSE("GPL v2");
+MODULE_VERSION("1.0");