Merge tag 'char-misc-6.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-miscHEADtorvalds/mastertorvalds/HEADmaster

Pull Char/Misc/IIO/Binder updates from Greg KH:
 "Here is the big set of char/misc/iio and other driver subsystem
  changes for 6.18-rc1.

  Loads of different stuff in here, it was a busy development cycle in
  lots of different subsystems, with over 27k new lines added to the
  tree.

  Included in here are:

   - IIO updates including new drivers, reworking of existing apis, and
     other goodness in the sensor subsystems

   - MEI driver updates and additions

   - NVMEM driver updates

   - slimbus removal for an unused driver and some other minor updates

   - coresight driver updates and additions

   - MHI driver updates

   - comedi driver updates and fixes

   - extcon driver updates

   - interconnect driver additions

   - eeprom driver updates and fixes

   - minor UIO driver updates

   - tiny W1 driver updates

  But the majority of new code is in the rust bindings and additions,
  which includes:

   - misc driver rust binding updates for read/write support, we can now
     write "normal" misc drivers in rust fully, and the sample driver
     shows how this can be done.

   - Initial framework for USB driver rust bindings, which are disabled
     for now in the build, due to limited support, but coming in through
     this tree due to dependencies on other rust binding changes that
     were in here. I'll be enabling these back on in the build in the
     usb.git tree after -rc1 is out so that developers can continue to
     work on these in linux-next over the next development cycle.

   - Android Binder driver implemented in Rust.

     This is the big one, and was driving a huge majority of the rust
     binding work over the past years. Right now there are two binder
     drivers in the kernel, selected only at build time as to which one
     to use as binder wants to be included in the system at boot time.

     The binder C maintainers all agreed on this, as eventually, they
     want the C code to be removed from the tree, but it will take a few
     releases to get there while both are maintained to ensure that the
     rust implementation is fully stable and compliant with the existing
     userspace apis.

  All of these have been in linux-next for a while"

* tag 'char-misc-6.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (320 commits)
  rust: usb: keep usb::Device private for now
  rust: usb: don't retain device context for the interface parent
  USB: disable rust bindings from the build for now
  samples: rust: add a USB driver sample
  rust: usb: add basic USB abstractions
  coresight: Add label sysfs node support
  dt-bindings: arm: Add label in the coresight components
  coresight: tnoc: add new AMBA ID to support Trace Noc V2
  coresight: Fix incorrect handling for return value of devm_kzalloc
  coresight: tpda: fix the logic to setup the element size
  coresight: trbe: Return NULL pointer for allocation failures
  coresight: Refactor runtime PM
  coresight: Make clock sequence consistent
  coresight: Refactor driver data allocation
  coresight: Consolidate clock enabling
  coresight: Avoid enable programming clock duplicately
  coresight: Appropriately disable trace bus clocks
  coresight: Appropriately disable programming clocks
  coresight: etm4x: Support atclk
  coresight: catu: Support atclk
  ...

1 files changed, 328 insertions, 0 deletions

diff --git a/drivers/iio/adc/intel_dc_ti_adc.c b/drivers/iio/adc/intel_dc_ti_adc.c
new file mode 100644
index 000000000000..0fe34f1c338e
--- /dev/null
+++ b/drivers/iio/adc/intel_dc_ti_adc.c
@@ -0,0 +1,328 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Intel Dollar Cove TI PMIC GPADC Driver
+ *
+ * Copyright (C) 2014 Intel Corporation (Ramakrishna Pallala <ramakrishna.pallala@intel.com>)
+ * Copyright (C) 2024 - 2025 Hans de Goede <hansg@kernel.org>
+ */
+
+#include <linux/bits.h>
+#include <linux/bitfield.h>
+#include <linux/bitops.h>
+#include <linux/cleanup.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/interrupt.h>
+#include <linux/mfd/intel_soc_pmic.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/wait.h>
+
+#include <linux/iio/driver.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/machine.h>
+
+#define DC_TI_ADC_CNTL_REG			0x50
+#define DC_TI_ADC_START				BIT(0)
+#define DC_TI_ADC_CH_SEL			GENMASK(2, 1)
+#define DC_TI_ADC_EN				BIT(5)
+#define DC_TI_ADC_EN_EXT_BPTH_BIAS		BIT(6)
+
+#define DC_TI_VBAT_ZSE_GE_REG			0x53
+#define DC_TI_VBAT_GE				GENMASK(3, 0)
+#define DC_TI_VBAT_ZSE				GENMASK(7, 4)
+
+/* VBAT GE gain correction is in 0.0015 increments, ZSE is in 1.0 increments */
+#define DC_TI_VBAT_GE_STEP			15
+#define DC_TI_VBAT_GE_DIV			10000
+
+#define DC_TI_ADC_DATA_REG_CH(x)		(0x54 + 2 * (x))
+
+enum dc_ti_adc_id {
+	DC_TI_ADC_VBAT,
+	DC_TI_ADC_PMICTEMP,
+	DC_TI_ADC_BATTEMP,
+	DC_TI_ADC_SYSTEMP0,
+};
+
+struct dc_ti_adc_info {
+	struct mutex lock; /* Protects against concurrent accesses to the ADC */
+	wait_queue_head_t wait;
+	struct device *dev;
+	struct regmap *regmap;
+	int vbat_zse;
+	int vbat_ge;
+	bool conversion_done;
+};
+
+static const struct iio_chan_spec dc_ti_adc_channels[] = {
+	{
+		.indexed = 1,
+		.type = IIO_VOLTAGE,
+		.channel = DC_TI_ADC_VBAT,
+		.address = DC_TI_ADC_DATA_REG_CH(0),
+		.datasheet_name = "CH0",
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+				      BIT(IIO_CHAN_INFO_SCALE) |
+				      BIT(IIO_CHAN_INFO_PROCESSED),
+	}, {
+		.indexed = 1,
+		.type = IIO_TEMP,
+		.channel = DC_TI_ADC_PMICTEMP,
+		.address = DC_TI_ADC_DATA_REG_CH(1),
+		.datasheet_name = "CH1",
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+	}, {
+		.indexed = 1,
+		.type = IIO_TEMP,
+		.channel = DC_TI_ADC_BATTEMP,
+		.address = DC_TI_ADC_DATA_REG_CH(2),
+		.datasheet_name = "CH2",
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+	}, {
+		.indexed = 1,
+		.type = IIO_TEMP,
+		.channel = DC_TI_ADC_SYSTEMP0,
+		.address = DC_TI_ADC_DATA_REG_CH(3),
+		.datasheet_name = "CH3",
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+	}
+};
+
+static struct iio_map dc_ti_adc_default_maps[] = {
+	IIO_MAP("CH0", "chtdc_ti_battery", "VBAT"),
+	IIO_MAP("CH1", "chtdc_ti_battery", "PMICTEMP"),
+	IIO_MAP("CH2", "chtdc_ti_battery", "BATTEMP"),
+	IIO_MAP("CH3", "chtdc_ti_battery", "SYSTEMP0"),
+	{ }
+};
+
+static irqreturn_t dc_ti_adc_isr(int irq, void *data)
+{
+	struct dc_ti_adc_info *info = data;
+
+	info->conversion_done = true;
+	wake_up(&info->wait);
+	return IRQ_HANDLED;
+}
+
+static int dc_ti_adc_scale(struct dc_ti_adc_info *info,
+			   struct iio_chan_spec const *chan,
+			   int *val, int *val2)
+{
+	if (chan->channel != DC_TI_ADC_VBAT)
+		return -EINVAL;
+
+	/* Vbat ADC scale is 4.6875 mV / unit */
+	*val = 4;
+	*val2 = 687500;
+
+	return IIO_VAL_INT_PLUS_MICRO;
+}
+
+static int dc_ti_adc_raw_to_processed(struct dc_ti_adc_info *info,
+				      struct iio_chan_spec const *chan,
+				      int raw, int *val, int *val2)
+{
+	if (chan->channel != DC_TI_ADC_VBAT)
+		return -EINVAL;
+
+	/* Apply calibration */
+	raw -= info->vbat_zse;
+	raw = raw * (DC_TI_VBAT_GE_DIV - info->vbat_ge * DC_TI_VBAT_GE_STEP) /
+	      DC_TI_VBAT_GE_DIV;
+	/* Vbat ADC scale is 4.6875 mV / unit */
+	raw *= 46875;
+
+	/* raw is now in 10000 units / mV, convert to milli + milli/1e6 */
+	*val = raw / 10000;
+	*val2 = (raw % 10000) * 100;
+
+	return IIO_VAL_INT_PLUS_MICRO;
+}
+
+static int dc_ti_adc_sample(struct dc_ti_adc_info *info,
+			    struct iio_chan_spec const *chan, int *val)
+{
+	int ret, ch = chan->channel;
+	__be16 buf;
+
+	info->conversion_done = false;
+
+	/*
+	 * As per TI (PMIC Vendor), the ADC enable and ADC start commands should
+	 * not be sent together. Hence send the commands separately.
+	 */
+	ret = regmap_set_bits(info->regmap, DC_TI_ADC_CNTL_REG, DC_TI_ADC_EN);
+	if (ret)
+		return ret;
+
+	ret = regmap_update_bits(info->regmap, DC_TI_ADC_CNTL_REG,
+				 DC_TI_ADC_CH_SEL,
+				 FIELD_PREP(DC_TI_ADC_CH_SEL, ch));
+	if (ret)
+		return ret;
+
+	/*
+	 * As per PMIC Vendor, a minimum of 50 ųs delay is required between ADC
+	 * Enable and ADC START commands. This is also recommended by Intel
+	 * Hardware team after the timing analysis of GPADC signals. Since the
+	 * I2C Write transaction to set the channel number also imparts 25 ųs
+	 * delay, we need to wait for another 25 ųs before issuing ADC START.
+	 */
+	fsleep(25);
+
+	ret = regmap_set_bits(info->regmap, DC_TI_ADC_CNTL_REG,
+			      DC_TI_ADC_START);
+	if (ret)
+		return ret;
+
+	/* TI (PMIC Vendor) recommends 5 s timeout for conversion */
+	ret = wait_event_timeout(info->wait, info->conversion_done, 5 * HZ);
+	if (ret == 0) {
+		ret = -ETIMEDOUT;
+		goto disable_adc;
+	}
+
+	ret = regmap_bulk_read(info->regmap, chan->address, &buf, sizeof(buf));
+	if (ret)
+		goto disable_adc;
+
+	/* The ADC values are 10 bits wide */
+	*val = be16_to_cpu(buf) & GENMASK(9, 0);
+
+disable_adc:
+	regmap_clear_bits(info->regmap, DC_TI_ADC_CNTL_REG,
+			  DC_TI_ADC_START | DC_TI_ADC_EN);
+	return ret;
+}
+
+static int dc_ti_adc_read_raw(struct iio_dev *indio_dev,
+			      struct iio_chan_spec const *chan,
+			      int *val, int *val2, long mask)
+{
+	struct dc_ti_adc_info *info = iio_priv(indio_dev);
+	int ret;
+
+	if (mask == IIO_CHAN_INFO_SCALE)
+		return dc_ti_adc_scale(info, chan, val, val2);
+
+	guard(mutex)(&info->lock);
+
+	/*
+	 * If channel BPTHERM has been selected, first enable the BPTHERM BIAS
+	 * which provides the VREF Voltage reference to convert BPTHERM Input
+	 * voltage to temperature.
+	 */
+	if (chan->channel == DC_TI_ADC_BATTEMP) {
+		ret = regmap_set_bits(info->regmap, DC_TI_ADC_CNTL_REG,
+				      DC_TI_ADC_EN_EXT_BPTH_BIAS);
+		if (ret)
+			return ret;
+		/*
+		 * As per PMIC Vendor specifications, BPTHERM BIAS should be
+		 * enabled 35 ms before ADC_EN command.
+		 */
+		msleep(35);
+	}
+
+	ret = dc_ti_adc_sample(info, chan, val);
+
+	if (chan->channel == DC_TI_ADC_BATTEMP)
+		regmap_clear_bits(info->regmap, DC_TI_ADC_CNTL_REG,
+				  DC_TI_ADC_EN_EXT_BPTH_BIAS);
+
+	if (ret)
+		return ret;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		return IIO_VAL_INT;
+	case IIO_CHAN_INFO_PROCESSED:
+		return dc_ti_adc_raw_to_processed(info, chan, *val, val, val2);
+	}
+
+	return -EINVAL;
+}
+
+static const struct iio_info dc_ti_adc_iio_info = {
+	.read_raw = dc_ti_adc_read_raw,
+};
+
+static int dc_ti_adc_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct intel_soc_pmic *pmic = dev_get_drvdata(dev->parent);
+	struct dc_ti_adc_info *info;
+	struct iio_dev *indio_dev;
+	unsigned int val;
+	int irq, ret;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
+
+	indio_dev = devm_iio_device_alloc(dev, sizeof(*info));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	info = iio_priv(indio_dev);
+
+	ret = devm_mutex_init(dev, &info->lock);
+	if (ret)
+		return ret;
+
+	init_waitqueue_head(&info->wait);
+
+	info->dev = dev;
+	info->regmap = pmic->regmap;
+
+	indio_dev->name = "dc_ti_adc";
+	indio_dev->channels = dc_ti_adc_channels;
+	indio_dev->num_channels = ARRAY_SIZE(dc_ti_adc_channels);
+	indio_dev->info = &dc_ti_adc_iio_info;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+
+	ret = regmap_read(info->regmap, DC_TI_VBAT_ZSE_GE_REG, &val);
+	if (ret)
+		return ret;
+
+	info->vbat_zse = sign_extend32(FIELD_GET(DC_TI_VBAT_ZSE, val), 3);
+	info->vbat_ge = sign_extend32(FIELD_GET(DC_TI_VBAT_GE, val), 3);
+
+	dev_dbg(dev, "vbat-zse %d vbat-ge %d\n", info->vbat_zse, info->vbat_ge);
+
+	ret = devm_iio_map_array_register(dev, indio_dev, dc_ti_adc_default_maps);
+	if (ret)
+		return ret;
+
+	ret = devm_request_threaded_irq(dev, irq, NULL, dc_ti_adc_isr,
+					IRQF_ONESHOT, indio_dev->name, info);
+	if (ret)
+		return ret;
+
+	return devm_iio_device_register(dev, indio_dev);
+}
+
+static const struct platform_device_id dc_ti_adc_ids[] = {
+	{ .name = "chtdc_ti_adc" },
+	{ }
+};
+MODULE_DEVICE_TABLE(platform, dc_ti_adc_ids);
+
+static struct platform_driver dc_ti_adc_driver = {
+	.driver = {
+		.name	= "dc_ti_adc",
+	},
+	.probe		= dc_ti_adc_probe,
+	.id_table	= dc_ti_adc_ids,
+};
+module_platform_driver(dc_ti_adc_driver);
+
+MODULE_AUTHOR("Ramakrishna Pallala (Intel)");
+MODULE_AUTHOR("Hans de Goede <hansg@kernel.org>");
+MODULE_DESCRIPTION("Intel Dollar Cove (TI) GPADC Driver");
+MODULE_LICENSE("GPL");