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build/patch/kernel/archive/sunxi-6.1/patches.megous/iio-magnetometer-add-a-driver-for-Voltafield-AF8133J-magnetomet.patch

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From 81475b738ed4a0051efc917b5e22ac62eb292e73 Mon Sep 17 00:00:00 2001
From: Icenowy Zheng <icenowy@aosc.io>
Date: Thu, 18 Mar 2021 20:19:25 +0800
Subject: [PATCH 334/389] iio: magnetometer: add a driver for Voltafield
AF8133J magnetometer
AF8133J is a simple I2C-connected magnetometer, without interrupts.
Add a simple IIO driver for it.
Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
Signed-off-by: Dalton Durst <dalton@ubports.com>
Signed-off-by: Shoji Keita <awaittrot@shjk.jp>
---
drivers/iio/magnetometer/Kconfig | 12 +
drivers/iio/magnetometer/Makefile | 1 +
drivers/iio/magnetometer/af8133j.c | 352 +++++++++++++++++++++++++++++
3 files changed, 365 insertions(+)
create mode 100644 drivers/iio/magnetometer/af8133j.c
diff --git a/drivers/iio/magnetometer/Kconfig b/drivers/iio/magnetometer/Kconfig
index b91fc5e6a26e..9b3afa52c6f6 100644
--- a/drivers/iio/magnetometer/Kconfig
+++ b/drivers/iio/magnetometer/Kconfig
@@ -6,6 +6,18 @@
menu "Magnetometer sensors"
+config AF8133J
+ tristate "Voltafield AF8133J 3-Axis Magnetometer"
+ depends on I2C
+ depends on OF
+ select REGMAP_I2C
+ help
+ Say yes here to build support for Voltafield AF8133J I2C-based
+ 3-axis magnetometer chip.
+
+ To compile this driver as a module, choose M here: the module
+ will be called af8133j.
+
config AK8974
tristate "Asahi Kasei AK8974 3-Axis Magnetometer"
depends on I2C
diff --git a/drivers/iio/magnetometer/Makefile b/drivers/iio/magnetometer/Makefile
index b9f45b7fafc3..9edffdc6b86d 100644
--- a/drivers/iio/magnetometer/Makefile
+++ b/drivers/iio/magnetometer/Makefile
@@ -4,6 +4,7 @@
#
# When adding new entries keep the list in alphabetical order
+obj-$(CONFIG_AF8133J) += af8133j.o
obj-$(CONFIG_AK8974) += ak8974.o
obj-$(CONFIG_AK8975) += ak8975.o
obj-$(CONFIG_BMC150_MAGN) += bmc150_magn.o
diff --git a/drivers/iio/magnetometer/af8133j.c b/drivers/iio/magnetometer/af8133j.c
new file mode 100644
index 000000000000..2aa7cb03148c
--- /dev/null
+++ b/drivers/iio/magnetometer/af8133j.c
@@ -0,0 +1,352 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * af8133j.c - Voltafield AF8133J magnetometer driver
+ *
+ * Based on mmc35240.c, which is:
+ * Copyright (c) 2015, Intel Corporation.
+ *
+ * TODO:
+ */
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/delay.h>
+#include <linux/regmap.h>
+#include <linux/gpio/consumer.h>
+#include <linux/regulator/consumer.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+#define AF8133J_DRV_NAME "af8133j"
+#define AF8133J_REGMAP_NAME "af8133j_regmap"
+
+#define AF8133J_REG_OUT 0x03
+/* Little endian */
+#define AF8133J_REG_OUT_SIZE 0x06
+
+#define AF8133J_REG_PCODE 0x00
+#define AF8133J_REG_PCODE_VAL 0x5e
+
+/* Named STATUS in datasheet, renamed here to prevent confusion with STATE */
+#define AF8133J_REG_DRDY 0x02
+#define AF8133J_REG_DRDY_ACQ BIT(0)
+/* Named STATE in datasheet, renamed here to prevent confusion */
+#define AF8133J_REG_STATE 0x0a
+#define AF8133J_REG_STATE_STBY 0x00
+#define AF8133J_REG_STATE_WORK 0x01
+#define AF8133J_REG_RANGE 0x0b
+#define AF8133J_REG_RANGE_22G 0x12
+#define AF8133J_REG_RANGE_12G 0x34
+/* Software reset */
+#define AF8133J_REG_SWR 0x11
+#define AF8133J_REG_SWR_PERFORM BIT(0)
+
+struct af8133j_data {
+ struct i2c_client *client;
+ struct regmap *regmap;
+ struct mutex mutex;
+
+ struct gpio_desc *reset_gpiod;
+ struct regulator *avdd;
+ struct regulator *dvdd;
+ struct iio_mount_matrix orientation;
+};
+
+enum af8133j_axis {
+ AXIS_X = 0,
+ AXIS_Y,
+ AXIS_Z,
+};
+
+static struct iio_mount_matrix *
+af8133j_get_mount_matrix(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan)
+{
+ struct af8133j_data *data = iio_priv(indio_dev);
+ return &data->orientation;
+}
+
+static const struct iio_chan_spec_ext_info af8133j_ext_info[] = {
+ IIO_MOUNT_MATRIX(IIO_SHARED_BY_DIR, af8133j_get_mount_matrix),
+ { }
+};
+
+#define AF8133J_CHANNEL(_axis) { \
+ .type = IIO_MAGN, \
+ .modified = 1, \
+ .channel2 = IIO_MOD_ ## _axis, \
+ .address = AXIS_ ## _axis, \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
+ .ext_info = af8133j_ext_info, \
+}
+
+static const struct iio_chan_spec af8133j_channels[] = {
+ AF8133J_CHANNEL(X),
+ AF8133J_CHANNEL(Y),
+ AF8133J_CHANNEL(Z),
+};
+
+static int af8133j_init(struct af8133j_data *data)
+{
+ unsigned int val;
+ int ret;
+
+ ret = regmap_read(data->regmap, AF8133J_REG_PCODE, &val);
+ if (ret < 0) {
+ dev_err(&data->client->dev, "Error reading product code\n");
+ return ret;
+ }
+
+ if (val != AF8133J_REG_PCODE_VAL) {
+ dev_warn(&data->client->dev,
+ "Unknown AF8133J product code %x\n", val);
+ }
+
+ /* Reset the chip */
+ ret = regmap_write(data->regmap, AF8133J_REG_SWR,
+ AF8133J_REG_SWR_PERFORM);
+ if (ret < 0) {
+ dev_err(&data->client->dev, "Failed to write regmap\n");
+ return ret;
+ }
+
+ /* Wait for reset finish */
+ usleep_range(1000, 1100);
+
+ /* Check whether the reset bit is cleared */
+ ret = regmap_read(data->regmap, AF8133J_REG_SWR, &val);
+ if (ret < 0) {
+ dev_err(&data->client->dev, "Failed to read regmap\n");
+ return ret;
+ }
+ if (val & AF8133J_REG_SWR_PERFORM) {
+ dev_err(&data->client->dev, "Device is not responding\n");
+ return -EIO;
+ }
+
+ /* The reset value should satisfy us now. */
+
+ return 0;
+}
+
+static int af8133j_take_measurement(struct af8133j_data *data)
+{
+ unsigned int val;
+ int ret;
+
+ ret = regmap_write(data->regmap, AF8133J_REG_STATE,
+ AF8133J_REG_STATE_WORK);
+ if (ret < 0)
+ return ret;
+
+ /* The datasheet says "Mesaure Time <1.5ms" */
+ ret = regmap_read_poll_timeout(data->regmap, AF8133J_REG_DRDY, val,
+ val & AF8133J_REG_DRDY_ACQ,
+ 100, 1500);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_write(data->regmap, AF8133J_REG_STATE,
+ AF8133J_REG_STATE_STBY);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static int af8133j_read_measurement(struct af8133j_data *data, __le16 buf[3])
+{
+ int ret;
+
+ ret = af8133j_take_measurement(data);
+ if (ret < 0)
+ return ret;
+
+ return regmap_bulk_read(data->regmap, AF8133J_REG_OUT, buf,
+ 3 * sizeof(__le16));
+}
+
+static int af8133j_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan, int *val,
+ int *val2, long mask)
+{
+ struct af8133j_data *data = iio_priv(indio_dev);
+ int ret;
+ __le16 buf[3];
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ mutex_lock(&data->mutex);
+ ret = af8133j_read_measurement(data, buf);
+ mutex_unlock(&data->mutex);
+ if (ret < 0)
+ return ret;
+ *val = sign_extend32(le16_to_cpu(buf[chan->address]), 15);
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_SCALE:
+ /* We only use the default 12G scale now */
+ *val = 0;
+ *val2 = 12 * 1000000 / 32768;
+ return IIO_VAL_INT_PLUS_MICRO;
+ default:
+ return -EINVAL;
+ }
+}
+
+static const struct iio_info af8133j_info = {
+ .read_raw = af8133j_read_raw,
+};
+
+static const struct regmap_config af8133j_regmap_config = {
+ .name = AF8133J_REGMAP_NAME,
+
+ .reg_bits = 8,
+ .val_bits = 8,
+
+ .max_register = AF8133J_REG_SWR,
+ .cache_type = REGCACHE_NONE,
+};
+
+static int af8133j_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct af8133j_data *data;
+ struct iio_dev *indio_dev;
+ struct regmap *regmap;
+ int ret;
+
+ indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ regmap = devm_regmap_init_i2c(client, &af8133j_regmap_config);
+ if (IS_ERR(regmap)) {
+ dev_err(&client->dev, "regmap initialization failed\n");
+ return PTR_ERR(regmap);
+ }
+
+ data = iio_priv(indio_dev);
+ i2c_set_clientdata(client, indio_dev);
+ data->client = client;
+ data->regmap = regmap;
+
+ data->reset_gpiod = devm_gpiod_get(&client->dev, "reset",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(data->reset_gpiod)) {
+ dev_err(&client->dev, "Got error while retrieving reset gpio\n");
+ ret = PTR_ERR(data->reset_gpiod);
+ goto out_release_reset_gpio;
+ }
+
+ data->avdd = devm_regulator_get(&client->dev, "avdd");
+ if (IS_ERR(data->avdd)) {
+ dev_err(&client->dev, "Got error while retrieving avdd reg\n");
+ ret = PTR_ERR(data->avdd);
+ goto out_release_reset_gpio;
+ }
+
+ data->dvdd = devm_regulator_get(&client->dev, "dvdd");
+ if (IS_ERR(data->dvdd)) {
+ dev_err(&client->dev, "Got error while retrieving dvdd reg\n");
+ ret = PTR_ERR(data->dvdd);
+ goto out_release_reset_gpio;
+ }
+
+ mutex_init(&data->mutex);
+
+ ret = iio_read_mount_matrix(&client->dev, "mount-matrix",
+ &data->orientation);
+ if (ret)
+ return ret;
+
+ indio_dev->info = &af8133j_info;
+ indio_dev->name = AF8133J_DRV_NAME;
+ indio_dev->channels = af8133j_channels;
+ indio_dev->num_channels = ARRAY_SIZE(af8133j_channels);
+ indio_dev->modes = INDIO_DIRECT_MODE;
+
+ /* Power sequence */
+ ret = regulator_enable(data->avdd);
+ if (ret) {
+ dev_err(&client->dev, "Failed to enable avdd regulator");
+ goto out_release_reset_gpio;
+ }
+
+ ret = regulator_enable(data->dvdd);
+ if (ret) {
+ dev_err(&client->dev, "Failed to enable dvdd regulator");
+ goto out_disable_avdd;
+ }
+
+ msleep(15);
+
+ gpiod_set_value_cansleep(data->reset_gpiod, 0);
+
+ msleep(1);
+
+ ret = af8133j_init(data);
+ if (ret) {
+ dev_err(&client->dev, "Failed to init af8133j");
+ goto out_assert_reset;
+ }
+
+ ret = devm_iio_device_register(&client->dev, indio_dev);
+ if (ret) {
+ dev_err(&client->dev, "Failed to register iio device");
+ goto out_assert_reset;
+ }
+
+ return 0;
+
+out_assert_reset:
+ gpiod_set_value_cansleep(data->reset_gpiod, 1);
+ regulator_disable(data->dvdd);
+out_disable_avdd:
+ regulator_disable(data->avdd);
+out_release_reset_gpio:
+ gpiod_direction_input(data->reset_gpiod);
+
+ return ret;
+}
+
+static int af8133j_remove(struct i2c_client *client)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(client);
+ struct af8133j_data *data = iio_priv(indio_dev);
+
+ gpiod_set_value_cansleep(data->reset_gpiod, 0);
+ regulator_disable(data->dvdd);
+ regulator_disable(data->avdd);
+
+ return 0;
+}
+
+static const struct of_device_id af8133j_of_match[] = {
+ { .compatible = "voltafield,af8133j", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, af8133j_of_match);
+
+static const struct i2c_device_id af8133j_id[] = {
+ {"af8133j", 0},
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, af8133j_id);
+
+static struct i2c_driver af8133j_driver = {
+ .driver = {
+ .name = AF8133J_DRV_NAME,
+ .of_match_table = af8133j_of_match,
+ },
+ .probe = af8133j_probe,
+ .remove = af8133j_remove,
+ .id_table = af8133j_id,
+};
+
+module_i2c_driver(af8133j_driver);
+
+MODULE_AUTHOR("Icenowy Zheng <icenowy@aosc.io>");
+MODULE_DESCRIPTION("Voltafield AF8133J magnetic sensor driver");
+MODULE_LICENSE("GPL v2");
--
2.35.3
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