LC898217XC is a 11 bit DAC, designed for linear control
of voice coil motor. This driver creates a V4L2 subdevice
and provides control to set the desired focus.
Tested on Oneplus 6 (oneplus-enchilada)
Signed-off-by: Vasiliy Doylov <nekocwd@xxxxxxxxxxxxxx>
---
drivers/media/i2c/Kconfig | 11 ++
drivers/media/i2c/Makefile | 1 +
drivers/media/i2c/lc898217xc.c | 240 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 252 insertions(+)
diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index 85ecb2aeefdbfff744c8de86866560518abeace1..aa16d4729ba914e774da2ada228b00cfd2462080 100644
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -794,6 +794,17 @@ config VIDEO_DW9807_VCM
capability. This is designed for linear control of
voice coil motors, controlled via I2C serial interface.
+config VIDEO_LC898217XC
+ tristate "LC898217XC lens voice coil support"
+ depends on I2C && VIDEO_DEV
+ select MEDIA_CONTROLLER
+ select VIDEO_V4L2_SUBDEV_API
+ select V4L2_ASYNC
+ help
+ This is a driver for the LC898217XC camera lens voice coil.
+ LC898217XC is a 11 bit DAC with 110mA output current sink
+ capability. This is designed for linear control of
+ voice coil motors, controlled via I2C serial interface.
endmenu
menu "Flash devices"
diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
index fbb988bd067a1b8b577248811f18a15671eb8932..514b61a7e8769457c2e831df4cbe3c4aabc6ed1c 100644
--- a/drivers/media/i2c/Makefile
+++ b/drivers/media/i2c/Makefile
@@ -62,6 +62,7 @@ obj-$(CONFIG_VIDEO_IMX415) += imx415.o
obj-$(CONFIG_VIDEO_IR_I2C) += ir-kbd-i2c.o
obj-$(CONFIG_VIDEO_ISL7998X) += isl7998x.o
obj-$(CONFIG_VIDEO_KS0127) += ks0127.o
+obj-$(CONFIG_VIDEO_LC898217XC) += lc898217xc.o
obj-$(CONFIG_VIDEO_LM3560) += lm3560.o
obj-$(CONFIG_VIDEO_LM3646) += lm3646.o
obj-$(CONFIG_VIDEO_M52790) += m52790.o
diff --git a/drivers/media/i2c/lc898217xc.c b/drivers/media/i2c/lc898217xc.c
new file mode 100644
index 0000000000000000000000000000000000000000..86afbf88e72a078da131a26ac0bc89ec2a2c92ff
--- /dev/null
+++ b/drivers/media/i2c/lc898217xc.c
@@ -0,0 +1,240 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+// Copyright (c) 2025 Vasiliy Doylov <nekocwd@xxxxxxxxxxxxxx>
+
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
+#include <media/v4l2-async.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-fwnode.h>
+#include <media/v4l2-subdev.h>
+#include <media/v4l2-event.h>
+
+#define LC898217XC_NAME "lc898217xc"
+/* Actuator has 11 bit resolution */
+#define LC898217XC_MAX_FOCUS_POS (2048 - 1)
+#define LC898217XC_MIN_FOCUS_POS 0
+#define LC898217XC_FOCUS_STEPS 1
+
+#define LC898217XC_MSB_ADDR 132
+
+static const char *const lc898217xc_supply_names[] = {
+ "vcc",
+};
+
+struct lc898217xc {
+ struct regulator_bulk_data supplies[ARRAY_SIZE(lc898217xc_supply_names)];
+ struct v4l2_ctrl_handler ctrls;
+ struct v4l2_ctrl *focus;
+ struct v4l2_subdev sd;
+};
+
+static inline struct lc898217xc *sd_to_lc898217xc(struct v4l2_subdev *subdev)
+{
+ return container_of(subdev, struct lc898217xc, sd);
+}
+
+static int lc898217xc_set_dac(struct lc898217xc *lc898217xc, u16 val)
+{
+ struct i2c_client *client = v4l2_get_subdevdata(&lc898217xc->sd);
+
+ return i2c_smbus_write_word_swapped(client, LC898217XC_MSB_ADDR, val);
+}
+
+static int __maybe_unused lc898217xc_runtime_suspend(struct device *dev)
+{
+ struct v4l2_subdev *sd = dev_get_drvdata(dev);
+ struct lc898217xc *lc898217xc = sd_to_lc898217xc(sd);
+
+ regulator_bulk_disable(ARRAY_SIZE(lc898217xc_supply_names),
+ lc898217xc->supplies);
+
+ return 0;
+}
+
+static int __maybe_unused lc898217xc_runtime_resume(struct device *dev)
+{
+ struct v4l2_subdev *sd = dev_get_drvdata(dev);
+ struct lc898217xc *lc898217xc = sd_to_lc898217xc(sd);
+ int ret;
+
+ ret = regulator_bulk_enable(ARRAY_SIZE(lc898217xc_supply_names),
+ lc898217xc->supplies);
+
+ if (ret < 0) {
+ dev_err(dev, "failed to enable regulators\n");
+ return ret;
+ }
+
+ usleep_range(8000, 10000);
+
+ return ret;
+}
+
+static int lc898217xc_set_ctrl(struct v4l2_ctrl *ctrl)
+{
+ struct lc898217xc *lc898217xc =
+ container_of(ctrl->handler, struct lc898217xc, ctrls);
+
+ if (ctrl->id == V4L2_CID_FOCUS_ABSOLUTE)
+ return lc898217xc_set_dac(lc898217xc, ctrl->val);
+
+ return 0;
+}
+
+static const struct v4l2_ctrl_ops lc898217xc_ctrl_ops = {
+ .s_ctrl = lc898217xc_set_ctrl,
+};
+
+static int lc898217xc_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
+{
+ return pm_runtime_resume_and_get(sd->dev);
+}
+
+static int lc898217xc_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
+{
+ pm_runtime_mark_last_busy(sd->dev);
+ pm_runtime_put_autosuspend(sd->dev);
+
+ return 0;
+}
+
+static const struct v4l2_subdev_internal_ops lc898217xc_int_ops = {
+ .open = lc898217xc_open,
+ .close = lc898217xc_close,
+};
+
+static const struct v4l2_subdev_core_ops lc898217xc_core_ops = {
+ .log_status = v4l2_ctrl_subdev_log_status,
+ .subscribe_event = v4l2_ctrl_subdev_subscribe_event,
+ .unsubscribe_event = v4l2_event_subdev_unsubscribe,
+};
+
+static const struct v4l2_subdev_ops lc898217xc_ops = {
+ .core = &lc898217xc_core_ops,
+};
+
+static int lc898217xc_init_controls(struct lc898217xc *lc898217xc)
+{
+ struct v4l2_ctrl_handler *hdl = &lc898217xc->ctrls;
+ const struct v4l2_ctrl_ops *ops = &lc898217xc_ctrl_ops;
+
+ v4l2_ctrl_handler_init(hdl, 1);
+
+ lc898217xc->focus = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FOCUS_ABSOLUTE,
+ LC898217XC_MIN_FOCUS_POS,
+ LC898217XC_MAX_FOCUS_POS,
+ LC898217XC_FOCUS_STEPS, 0);
+
+ if (hdl->error)
+ return hdl->error;
+
+ lc898217xc->sd.ctrl_handler = hdl;
+
+ return 0;
+}
+
+static int lc898217xc_probe(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ struct lc898217xc *lc898217xc;
+ unsigned int i;
+ int ret;
+
+ lc898217xc = devm_kzalloc(dev, sizeof(*lc898217xc), GFP_KERNEL);
+ if (!lc898217xc)
+ return -ENOMEM;
+
+ /* Initialize subdev */
+ v4l2_i2c_subdev_init(&lc898217xc->sd, client, &lc898217xc_ops);
+
+ for (i = 0; i < ARRAY_SIZE(lc898217xc_supply_names); i++)
+ lc898217xc->supplies[i].supply = lc898217xc_supply_names[i];
+
+ ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(lc898217xc_supply_names),
+ lc898217xc->supplies);
+
+ if (ret) {
+ dev_err(dev, "failed to get regulators\n");
+ return ret;
+ }
+
+ /* Initialize controls */
+ ret = lc898217xc_init_controls(lc898217xc);
+ if (ret)
+ goto err_free_handler;
+
+ /* Initialize subdev */
+ lc898217xc->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE |
+ V4L2_SUBDEV_FL_HAS_EVENTS;
+ lc898217xc->sd.internal_ops = &lc898217xc_int_ops;
+
+ ret = media_entity_pads_init(&lc898217xc->sd.entity, 0, NULL);
+ if (ret < 0)
+ goto err_free_handler;
+
+ lc898217xc->sd.entity.function = MEDIA_ENT_F_LENS;
+
+ pm_runtime_enable(dev);
+ ret = v4l2_async_register_subdev(&lc898217xc->sd);
+
+ if (ret < 0) {
+ dev_err(dev, "failed to register V4L2 subdev: %d", ret);
+ goto err_power_off;
+ }
+
+ pm_runtime_set_autosuspend_delay(dev, 1000);
+ pm_runtime_use_autosuspend(dev);
+ pm_runtime_idle(dev);
+
+ return 0;
+
+err_power_off:
+ pm_runtime_disable(dev);
+ media_entity_cleanup(&lc898217xc->sd.entity);
+err_free_handler:
+ v4l2_ctrl_handler_free(&lc898217xc->ctrls);
+
+ return ret;
+}
+
+static void lc898217xc_remove(struct i2c_client *client)
+{
+ struct v4l2_subdev *sd = i2c_get_clientdata(client);
+ struct lc898217xc *lc898217xc = sd_to_lc898217xc(sd);
+ struct device *dev = &client->dev;
+
+ v4l2_async_unregister_subdev(&lc898217xc->sd);
+ v4l2_ctrl_handler_free(&lc898217xc->ctrls);
+ media_entity_cleanup(&lc898217xc->sd.entity);
+ pm_runtime_disable(dev);
+}
+
+static const struct of_device_id lc898217xc_of_table[] = {
+ { .compatible = "onnn,lc898217xc" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, lc898217xc_of_table);
+
+static const struct dev_pm_ops lc898217xc_pm_ops = {
+ SET_RUNTIME_PM_OPS(lc898217xc_runtime_suspend,
+ lc898217xc_runtime_resume, NULL)
+};
+
+static struct i2c_driver lc898217xc_i2c_driver = {
+ .driver = {
+ .name = LC898217XC_NAME,
+ .pm = &lc898217xc_pm_ops,
+ .of_match_table = lc898217xc_of_table,
+ },
+ .probe = lc898217xc_probe,
+ .remove = lc898217xc_remove,
+};
+module_i2c_driver(lc898217xc_i2c_driver);
+
+MODULE_AUTHOR("Vasiliy Doylov <nekocwd@xxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("Onsemi LC898217XC VCM driver");
+MODULE_LICENSE("GPL");
--
2.48.1
