Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 516 insertions, 0 deletions

diff --git a/drivers/iio/accel/kxsd9.c b/drivers/iio/accel/kxsd9.c
new file mode 100644
index 000000000..ba99649fe
--- /dev/null
+++ b/drivers/iio/accel/kxsd9.c
@@ -0,0 +1,516 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * kxsd9.c	simple support for the Kionix KXSD9 3D
+ *		accelerometer.
+ *
+ * Copyright (c) 2008-2009 Jonathan Cameron <jic23@kernel.org>
+ *
+ * The i2c interface is very similar, so shouldn't be a problem once
+ * I have a suitable wire made up.
+ *
+ * TODO:	Support the motion detector
+ */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/sysfs.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/regulator/consumer.h>
+#include <linux/pm_runtime.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/triggered_buffer.h>
+#include <linux/iio/trigger_consumer.h>
+
+#include "kxsd9.h"
+
+#define KXSD9_REG_X		0x00
+#define KXSD9_REG_Y		0x02
+#define KXSD9_REG_Z		0x04
+#define KXSD9_REG_AUX		0x06
+#define KXSD9_REG_RESET		0x0a
+#define KXSD9_REG_CTRL_C	0x0c
+
+#define KXSD9_CTRL_C_FS_MASK	0x03
+#define KXSD9_CTRL_C_FS_8G	0x00
+#define KXSD9_CTRL_C_FS_6G	0x01
+#define KXSD9_CTRL_C_FS_4G	0x02
+#define KXSD9_CTRL_C_FS_2G	0x03
+#define KXSD9_CTRL_C_MOT_LAT	BIT(3)
+#define KXSD9_CTRL_C_MOT_LEV	BIT(4)
+#define KXSD9_CTRL_C_LP_MASK	0xe0
+#define KXSD9_CTRL_C_LP_NONE	0x00
+#define KXSD9_CTRL_C_LP_2000HZC	BIT(5)
+#define KXSD9_CTRL_C_LP_2000HZB	BIT(6)
+#define KXSD9_CTRL_C_LP_2000HZA	(BIT(5)|BIT(6))
+#define KXSD9_CTRL_C_LP_1000HZ	BIT(7)
+#define KXSD9_CTRL_C_LP_500HZ	(BIT(7)|BIT(5))
+#define KXSD9_CTRL_C_LP_100HZ	(BIT(7)|BIT(6))
+#define KXSD9_CTRL_C_LP_50HZ	(BIT(7)|BIT(6)|BIT(5))
+
+#define KXSD9_REG_CTRL_B	0x0d
+
+#define KXSD9_CTRL_B_CLK_HLD	BIT(7)
+#define KXSD9_CTRL_B_ENABLE	BIT(6)
+#define KXSD9_CTRL_B_ST		BIT(5) /* Self-test */
+
+#define KXSD9_REG_CTRL_A	0x0e
+
+/**
+ * struct kxsd9_state - device related storage
+ * @dev: pointer to the parent device
+ * @map: regmap to the device
+ * @orientation: mounting matrix, flipped axis etc
+ * @regs: regulators for this device, VDD and IOVDD
+ * @scale: the current scaling setting
+ */
+struct kxsd9_state {
+	struct device *dev;
+	struct regmap *map;
+	struct iio_mount_matrix orientation;
+	struct regulator_bulk_data regs[2];
+	u8 scale;
+};
+
+#define KXSD9_SCALE_2G "0.011978"
+#define KXSD9_SCALE_4G "0.023927"
+#define KXSD9_SCALE_6G "0.035934"
+#define KXSD9_SCALE_8G "0.047853"
+
+/* reverse order */
+static const int kxsd9_micro_scales[4] = { 47853, 35934, 23927, 11978 };
+
+#define KXSD9_ZERO_G_OFFSET -2048
+
+/*
+ * Regulator names
+ */
+static const char kxsd9_reg_vdd[] = "vdd";
+static const char kxsd9_reg_iovdd[] = "iovdd";
+
+static int kxsd9_write_scale(struct iio_dev *indio_dev, int micro)
+{
+	int ret, i;
+	struct kxsd9_state *st = iio_priv(indio_dev);
+	bool foundit = false;
+
+	for (i = 0; i < 4; i++)
+		if (micro == kxsd9_micro_scales[i]) {
+			foundit = true;
+			break;
+		}
+	if (!foundit)
+		return -EINVAL;
+
+	ret = regmap_update_bits(st->map,
+				 KXSD9_REG_CTRL_C,
+				 KXSD9_CTRL_C_FS_MASK,
+				 i);
+	if (ret < 0)
+		goto error_ret;
+
+	/* Cached scale when the sensor is powered down */
+	st->scale = i;
+
+error_ret:
+	return ret;
+}
+
+static IIO_CONST_ATTR(accel_scale_available,
+		KXSD9_SCALE_2G " "
+		KXSD9_SCALE_4G " "
+		KXSD9_SCALE_6G " "
+		KXSD9_SCALE_8G);
+
+static struct attribute *kxsd9_attributes[] = {
+	&iio_const_attr_accel_scale_available.dev_attr.attr,
+	NULL,
+};
+
+static int kxsd9_write_raw(struct iio_dev *indio_dev,
+			   struct iio_chan_spec const *chan,
+			   int val,
+			   int val2,
+			   long mask)
+{
+	int ret = -EINVAL;
+	struct kxsd9_state *st = iio_priv(indio_dev);
+
+	pm_runtime_get_sync(st->dev);
+
+	if (mask == IIO_CHAN_INFO_SCALE) {
+		/* Check no integer component */
+		if (val)
+			return -EINVAL;
+		ret = kxsd9_write_scale(indio_dev, val2);
+	}
+
+	pm_runtime_mark_last_busy(st->dev);
+	pm_runtime_put_autosuspend(st->dev);
+
+	return ret;
+}
+
+static int kxsd9_read_raw(struct iio_dev *indio_dev,
+			  struct iio_chan_spec const *chan,
+			  int *val, int *val2, long mask)
+{
+	int ret = -EINVAL;
+	struct kxsd9_state *st = iio_priv(indio_dev);
+	unsigned int regval;
+	__be16 raw_val;
+	u16 nval;
+
+	pm_runtime_get_sync(st->dev);
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		ret = regmap_bulk_read(st->map, chan->address, &raw_val,
+				       sizeof(raw_val));
+		if (ret)
+			goto error_ret;
+		nval = be16_to_cpu(raw_val);
+		/* Only 12 bits are valid */
+		nval >>= 4;
+		*val = nval;
+		ret = IIO_VAL_INT;
+		break;
+	case IIO_CHAN_INFO_OFFSET:
+		/* This has a bias of -2048 */
+		*val = KXSD9_ZERO_G_OFFSET;
+		ret = IIO_VAL_INT;
+		break;
+	case IIO_CHAN_INFO_SCALE:
+		ret = regmap_read(st->map,
+				  KXSD9_REG_CTRL_C,
+				  &regval);
+		if (ret < 0)
+			goto error_ret;
+		*val = 0;
+		*val2 = kxsd9_micro_scales[regval & KXSD9_CTRL_C_FS_MASK];
+		ret = IIO_VAL_INT_PLUS_MICRO;
+		break;
+	}
+
+error_ret:
+	pm_runtime_mark_last_busy(st->dev);
+	pm_runtime_put_autosuspend(st->dev);
+
+	return ret;
+};
+
+static irqreturn_t kxsd9_trigger_handler(int irq, void *p)
+{
+	const struct iio_poll_func *pf = p;
+	struct iio_dev *indio_dev = pf->indio_dev;
+	struct kxsd9_state *st = iio_priv(indio_dev);
+	/*
+	 * Ensure correct positioning and alignment of timestamp.
+	 * No need to zero initialize as all elements written.
+	 */
+	struct {
+		__be16 chan[4];
+		s64 ts __aligned(8);
+	} hw_values;
+	int ret;
+
+	ret = regmap_bulk_read(st->map,
+			       KXSD9_REG_X,
+			       hw_values.chan,
+			       sizeof(hw_values.chan));
+	if (ret) {
+		dev_err(st->dev, "error reading data: %d\n", ret);
+		goto out;
+	}
+
+	iio_push_to_buffers_with_timestamp(indio_dev,
+					   &hw_values,
+					   iio_get_time_ns(indio_dev));
+out:
+	iio_trigger_notify_done(indio_dev->trig);
+
+	return IRQ_HANDLED;
+}
+
+static int kxsd9_buffer_preenable(struct iio_dev *indio_dev)
+{
+	struct kxsd9_state *st = iio_priv(indio_dev);
+
+	pm_runtime_get_sync(st->dev);
+
+	return 0;
+}
+
+static int kxsd9_buffer_postdisable(struct iio_dev *indio_dev)
+{
+	struct kxsd9_state *st = iio_priv(indio_dev);
+
+	pm_runtime_mark_last_busy(st->dev);
+	pm_runtime_put_autosuspend(st->dev);
+
+	return 0;
+}
+
+static const struct iio_buffer_setup_ops kxsd9_buffer_setup_ops = {
+	.preenable = kxsd9_buffer_preenable,
+	.postdisable = kxsd9_buffer_postdisable,
+};
+
+static const struct iio_mount_matrix *
+kxsd9_get_mount_matrix(const struct iio_dev *indio_dev,
+		       const struct iio_chan_spec *chan)
+{
+	struct kxsd9_state *st = iio_priv(indio_dev);
+
+	return &st->orientation;
+}
+
+static const struct iio_chan_spec_ext_info kxsd9_ext_info[] = {
+	IIO_MOUNT_MATRIX(IIO_SHARED_BY_TYPE, kxsd9_get_mount_matrix),
+	{ },
+};
+
+#define KXSD9_ACCEL_CHAN(axis, index)						\
+	{								\
+		.type = IIO_ACCEL,					\
+		.modified = 1,						\
+		.channel2 = IIO_MOD_##axis,				\
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),		\
+		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) |	\
+					BIT(IIO_CHAN_INFO_OFFSET),	\
+		.ext_info = kxsd9_ext_info,				\
+		.address = KXSD9_REG_##axis,				\
+		.scan_index = index,					\
+		.scan_type = {                                          \
+			.sign = 'u',					\
+			.realbits = 12,					\
+			.storagebits = 16,				\
+			.shift = 4,					\
+			.endianness = IIO_BE,				\
+		},							\
+	}
+
+static const struct iio_chan_spec kxsd9_channels[] = {
+	KXSD9_ACCEL_CHAN(X, 0),
+	KXSD9_ACCEL_CHAN(Y, 1),
+	KXSD9_ACCEL_CHAN(Z, 2),
+	{
+		.type = IIO_VOLTAGE,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+		.indexed = 1,
+		.address = KXSD9_REG_AUX,
+		.scan_index = 3,
+		.scan_type = {
+			.sign = 'u',
+			.realbits = 12,
+			.storagebits = 16,
+			.shift = 4,
+			.endianness = IIO_BE,
+		},
+	},
+	IIO_CHAN_SOFT_TIMESTAMP(4),
+};
+
+static const struct attribute_group kxsd9_attribute_group = {
+	.attrs = kxsd9_attributes,
+};
+
+static int kxsd9_power_up(struct kxsd9_state *st)
+{
+	int ret;
+
+	/* Enable the regulators */
+	ret = regulator_bulk_enable(ARRAY_SIZE(st->regs), st->regs);
+	if (ret) {
+		dev_err(st->dev, "Cannot enable regulators\n");
+		return ret;
+	}
+
+	/* Power up */
+	ret = regmap_write(st->map,
+			   KXSD9_REG_CTRL_B,
+			   KXSD9_CTRL_B_ENABLE);
+	if (ret)
+		return ret;
+
+	/*
+	 * Set 1000Hz LPF, 2g fullscale, motion wakeup threshold 1g,
+	 * latched wakeup
+	 */
+	ret = regmap_write(st->map,
+			   KXSD9_REG_CTRL_C,
+			   KXSD9_CTRL_C_LP_1000HZ |
+			   KXSD9_CTRL_C_MOT_LEV	|
+			   KXSD9_CTRL_C_MOT_LAT |
+			   st->scale);
+	if (ret)
+		return ret;
+
+	/*
+	 * Power-up time depends on the LPF setting, but typ 15.9 ms, let's
+	 * set 20 ms to allow for some slack.
+	 */
+	msleep(20);
+
+	return 0;
+};
+
+static int kxsd9_power_down(struct kxsd9_state *st)
+{
+	int ret;
+
+	/*
+	 * Set into low power mode - since there may be more users of the
+	 * regulators this is the first step of the power saving: it will
+	 * make sure we conserve power even if there are others users on the
+	 * regulators.
+	 */
+	ret = regmap_update_bits(st->map,
+				 KXSD9_REG_CTRL_B,
+				 KXSD9_CTRL_B_ENABLE,
+				 0);
+	if (ret)
+		return ret;
+
+	/* Disable the regulators */
+	ret = regulator_bulk_disable(ARRAY_SIZE(st->regs), st->regs);
+	if (ret) {
+		dev_err(st->dev, "Cannot disable regulators\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static const struct iio_info kxsd9_info = {
+	.read_raw = &kxsd9_read_raw,
+	.write_raw = &kxsd9_write_raw,
+	.attrs = &kxsd9_attribute_group,
+};
+
+/* Four channels apart from timestamp, scan mask = 0x0f */
+static const unsigned long kxsd9_scan_masks[] = { 0xf, 0 };
+
+int kxsd9_common_probe(struct device *dev,
+		       struct regmap *map,
+		       const char *name)
+{
+	struct iio_dev *indio_dev;
+	struct kxsd9_state *st;
+	int ret;
+
+	indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	st = iio_priv(indio_dev);
+	st->dev = dev;
+	st->map = map;
+
+	indio_dev->channels = kxsd9_channels;
+	indio_dev->num_channels = ARRAY_SIZE(kxsd9_channels);
+	indio_dev->name = name;
+	indio_dev->info = &kxsd9_info;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->available_scan_masks = kxsd9_scan_masks;
+
+	/* Read the mounting matrix, if present */
+	ret = iio_read_mount_matrix(dev, &st->orientation);
+	if (ret)
+		return ret;
+
+	/* Fetch and turn on regulators */
+	st->regs[0].supply = kxsd9_reg_vdd;
+	st->regs[1].supply = kxsd9_reg_iovdd;
+	ret = devm_regulator_bulk_get(dev,
+				      ARRAY_SIZE(st->regs),
+				      st->regs);
+	if (ret) {
+		dev_err(dev, "Cannot get regulators\n");
+		return ret;
+	}
+	/* Default scaling */
+	st->scale = KXSD9_CTRL_C_FS_2G;
+
+	kxsd9_power_up(st);
+
+	ret = iio_triggered_buffer_setup(indio_dev,
+					 iio_pollfunc_store_time,
+					 kxsd9_trigger_handler,
+					 &kxsd9_buffer_setup_ops);
+	if (ret) {
+		dev_err(dev, "triggered buffer setup failed\n");
+		goto err_power_down;
+	}
+
+	ret = iio_device_register(indio_dev);
+	if (ret)
+		goto err_cleanup_buffer;
+
+	dev_set_drvdata(dev, indio_dev);
+
+	/* Enable runtime PM */
+	pm_runtime_get_noresume(dev);
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
+	/*
+	 * Set autosuspend to two orders of magnitude larger than the
+	 * start-up time. 20ms start-up time means 2000ms autosuspend,
+	 * i.e. 2 seconds.
+	 */
+	pm_runtime_set_autosuspend_delay(dev, 2000);
+	pm_runtime_use_autosuspend(dev);
+	pm_runtime_put(dev);
+
+	return 0;
+
+err_cleanup_buffer:
+	iio_triggered_buffer_cleanup(indio_dev);
+err_power_down:
+	kxsd9_power_down(st);
+
+	return ret;
+}
+EXPORT_SYMBOL_NS(kxsd9_common_probe, IIO_KXSD9);
+
+void kxsd9_common_remove(struct device *dev)
+{
+	struct iio_dev *indio_dev = dev_get_drvdata(dev);
+	struct kxsd9_state *st = iio_priv(indio_dev);
+
+	iio_triggered_buffer_cleanup(indio_dev);
+	iio_device_unregister(indio_dev);
+	pm_runtime_get_sync(dev);
+	pm_runtime_put_noidle(dev);
+	pm_runtime_disable(dev);
+	kxsd9_power_down(st);
+}
+EXPORT_SYMBOL_NS(kxsd9_common_remove, IIO_KXSD9);
+
+static int kxsd9_runtime_suspend(struct device *dev)
+{
+	struct iio_dev *indio_dev = dev_get_drvdata(dev);
+	struct kxsd9_state *st = iio_priv(indio_dev);
+
+	return kxsd9_power_down(st);
+}
+
+static int kxsd9_runtime_resume(struct device *dev)
+{
+	struct iio_dev *indio_dev = dev_get_drvdata(dev);
+	struct kxsd9_state *st = iio_priv(indio_dev);
+
+	return kxsd9_power_up(st);
+}
+
+EXPORT_NS_RUNTIME_DEV_PM_OPS(kxsd9_dev_pm_ops, kxsd9_runtime_suspend,
+			     kxsd9_runtime_resume, NULL, IIO_KXSD9);
+
+MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
+MODULE_DESCRIPTION("Kionix KXSD9 driver");
+MODULE_LICENSE("GPL v2");