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Diffstat (limited to 'target/linux/bcm27xx/patches-5.15/950-0773-media-i2c-Add-driver-for-AD5398-VCM-lens-driver.patch')
-rw-r--r--target/linux/bcm27xx/patches-5.15/950-0773-media-i2c-Add-driver-for-AD5398-VCM-lens-driver.patch388
1 files changed, 388 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.15/950-0773-media-i2c-Add-driver-for-AD5398-VCM-lens-driver.patch b/target/linux/bcm27xx/patches-5.15/950-0773-media-i2c-Add-driver-for-AD5398-VCM-lens-driver.patch
new file mode 100644
index 0000000000..21dcf6984c
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.15/950-0773-media-i2c-Add-driver-for-AD5398-VCM-lens-driver.patch
@@ -0,0 +1,388 @@
+From 838b1d352c8b7a8380fc2f00c42948e8307f51de Mon Sep 17 00:00:00 2001
+From: Dave Stevenson <dave.stevenson@raspberrypi.com>
+Date: Wed, 29 Sep 2021 14:04:28 +0100
+Subject: [PATCH] media: i2c: Add driver for AD5398 VCM lens driver
+
+Adds a driver for the Analog Devices AD5398 10 bit
+I2C DAC which is commonly used for driving VCM lens
+mechanisms.
+
+Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
+---
+ drivers/media/i2c/Kconfig | 7 +
+ drivers/media/i2c/Makefile | 1 +
+ drivers/media/i2c/ad5398.c | 342 +++++++++++++++++++++++++++++++++++++
+ 3 files changed, 350 insertions(+)
+ create mode 100644 drivers/media/i2c/ad5398.c
+
+--- a/drivers/media/i2c/Kconfig
++++ b/drivers/media/i2c/Kconfig
+@@ -1451,6 +1451,13 @@ endmenu
+ menu "Lens drivers"
+ visible if MEDIA_CAMERA_SUPPORT
+
++config VIDEO_AD5398
++ tristate "AD5398 lens voice coil support"
++ depends on GPIOLIB && I2C && VIDEO_V4L2
++ select MEDIA_CONTROLLER
++ help
++ This is a driver for the AD5398 camera lens voice coil.
++
+ config VIDEO_AD5820
+ tristate "AD5820 lens voice coil support"
+ depends on GPIOLIB && I2C && VIDEO_V4L2
+--- a/drivers/media/i2c/Makefile
++++ b/drivers/media/i2c/Makefile
+@@ -21,6 +21,7 @@ obj-$(CONFIG_VIDEO_SAA717X) += saa717x.o
+ obj-$(CONFIG_VIDEO_SAA7127) += saa7127.o
+ obj-$(CONFIG_VIDEO_SAA7185) += saa7185.o
+ obj-$(CONFIG_VIDEO_SAA6752HS) += saa6752hs.o
++obj-$(CONFIG_VIDEO_AD5398) += ad5398.o
+ obj-$(CONFIG_VIDEO_AD5820) += ad5820.o
+ obj-$(CONFIG_VIDEO_AK7375) += ak7375.o
+ obj-$(CONFIG_VIDEO_DW9714) += dw9714.o
+--- /dev/null
++++ b/drivers/media/i2c/ad5398.c
+@@ -0,0 +1,342 @@
++// SPDX-License-Identifier: GPL-2.0-only
++/*
++ * AD5398 DAC driver for camera voice coil focus.
++ * Copyright (C) 2021 Raspberry Pi (Trading) Ltd.
++ *
++ * Based on AD5820 DAC driver by Nokia and TI.
++ *
++ * This driver uses the regulator framework notification hooks on the
++ * assumption that the VCM and sensor share a regulator. This means the VCM
++ * position will be restored when either the sensor or VCM subdevices are opened
++ * or powered up. The client can therefore choose to ignore the VCM subdevice,
++ * and the lens position will be as previously requested. Without that, there
++ * is a hard requirement to have the VCM subdevice open in order for the VCM
++ * to be powered and at the requested position.
++ */
++
++#include <linux/errno.h>
++#include <linux/i2c.h>
++#include <linux/kernel.h>
++#include <linux/module.h>
++#include <linux/regulator/consumer.h>
++#include <linux/gpio/consumer.h>
++
++#include <media/v4l2-ctrls.h>
++#include <media/v4l2-device.h>
++#include <media/v4l2-subdev.h>
++
++/* Register definitions */
++#define AD5398_POWER_DOWN BIT(15)
++#define AD5398_DAC_SHIFT 4
++
++#define to_ad5398_device(sd) container_of(sd, struct ad5398_device, subdev)
++
++struct ad5398_device {
++ struct v4l2_subdev subdev;
++ struct ad5398_platform_data *platform_data;
++ struct regulator *vana;
++ struct notifier_block nb;
++
++ struct v4l2_ctrl_handler ctrls;
++ u32 focus_absolute;
++
++ bool standby;
++};
++
++static int ad5398_write(struct ad5398_device *coil, u16 data)
++{
++ struct i2c_client *client = v4l2_get_subdevdata(&coil->subdev);
++ struct i2c_msg msg;
++ __be16 be_data;
++ int r;
++
++ if (!client->adapter)
++ return -ENODEV;
++
++ be_data = cpu_to_be16(data);
++ msg.addr = client->addr;
++ msg.flags = 0;
++ msg.len = 2;
++ msg.buf = (u8 *)&be_data;
++
++ r = i2c_transfer(client->adapter, &msg, 1);
++ if (r < 0) {
++ dev_err(&client->dev, "write failed, error %d\n", r);
++ return r;
++ }
++
++ return 0;
++}
++
++/*
++ * Calculate status word and write it to the device based on current
++ * values of V4L2 controls. It is assumed that the stored V4L2 control
++ * values are properly limited and rounded.
++ */
++static int ad5398_update_hw(struct ad5398_device *coil)
++{
++ u16 status;
++
++ status = coil->focus_absolute << AD5398_DAC_SHIFT;
++
++ if (coil->standby)
++ status |= AD5398_POWER_DOWN;
++
++ return ad5398_write(coil, status);
++}
++
++/*
++ * Power handling
++ */
++static int ad5398_power_off(struct ad5398_device *coil)
++{
++ int ret = 0;
++
++ coil->standby = true;
++ ret = ad5398_update_hw(coil);
++
++ return ret;
++}
++
++static int ad5398_power_on(struct ad5398_device *coil)
++{
++ int ret;
++
++ /* Restore the hardware settings. */
++ coil->standby = false;
++ ret = ad5398_update_hw(coil);
++ if (ret)
++ goto fail;
++
++ return 0;
++
++fail:
++ coil->standby = true;
++
++ return ret;
++}
++
++/*
++ * V4L2 controls
++ */
++static int ad5398_set_ctrl(struct v4l2_ctrl *ctrl)
++{
++ struct ad5398_device *coil =
++ container_of(ctrl->handler, struct ad5398_device, ctrls);
++
++ switch (ctrl->id) {
++ case V4L2_CID_FOCUS_ABSOLUTE:
++ coil->focus_absolute = ctrl->val;
++ return ad5398_update_hw(coil);
++ }
++
++ return 0;
++}
++
++static const struct v4l2_ctrl_ops ad5398_ctrl_ops = {
++ .s_ctrl = ad5398_set_ctrl,
++};
++
++static int ad5398_init_controls(struct ad5398_device *coil)
++{
++ v4l2_ctrl_handler_init(&coil->ctrls, 1);
++
++ /*
++ * V4L2_CID_FOCUS_ABSOLUTE
++ *
++ * Minimum current is 0 mA, maximum is 120 mA. Thus, 1 code is
++ * equivalent to 120/1023 = 0.1173 mA. Nevertheless, we do not use [mA]
++ * for focus position, because it is meaningless for user. Meaningful
++ * would be to use focus distance or even its inverse, but since the
++ * driver doesn't have sufficient knowledge to do the conversion, we
++ * will just use abstract codes here. In any case, smaller value = focus
++ * position farther from camera. The default zero value means focus at
++ * infinity, and also least current consumption.
++ */
++ v4l2_ctrl_new_std(&coil->ctrls, &ad5398_ctrl_ops,
++ V4L2_CID_FOCUS_ABSOLUTE, 0, 1023, 1, 0);
++
++ if (coil->ctrls.error)
++ return coil->ctrls.error;
++
++ coil->focus_absolute = 0;
++
++ coil->subdev.ctrl_handler = &coil->ctrls;
++
++ return 0;
++}
++
++/*
++ * V4L2 subdev operations
++ */
++static int ad5398_registered(struct v4l2_subdev *subdev)
++{
++ struct ad5398_device *coil = to_ad5398_device(subdev);
++
++ return ad5398_init_controls(coil);
++}
++
++static int
++ad5398_set_power(struct v4l2_subdev *subdev, int on)
++{
++ struct ad5398_device *coil = to_ad5398_device(subdev);
++ int ret;
++
++ if (on)
++ ret = regulator_enable(coil->vana);
++ else
++ ret = regulator_disable(coil->vana);
++
++ return ret;
++}
++
++static int ad5398_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
++{
++ struct ad5398_device *coil = to_ad5398_device(sd);
++
++ return regulator_enable(coil->vana);
++}
++
++static int ad5398_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
++{
++ struct ad5398_device *coil = to_ad5398_device(sd);
++
++ return regulator_disable(coil->vana);
++}
++
++static const struct v4l2_subdev_core_ops ad5398_core_ops = {
++ .s_power = ad5398_set_power,
++};
++
++static const struct v4l2_subdev_ops ad5398_ops = {
++ .core = &ad5398_core_ops,
++};
++
++static const struct v4l2_subdev_internal_ops ad5398_internal_ops = {
++ .registered = ad5398_registered,
++ .open = ad5398_open,
++ .close = ad5398_close,
++};
++
++/*
++ * I2C driver
++ */
++static int __maybe_unused ad5398_suspend(struct device *dev)
++{
++ struct i2c_client *client = container_of(dev, struct i2c_client, dev);
++ struct v4l2_subdev *subdev = i2c_get_clientdata(client);
++ struct ad5398_device *coil = to_ad5398_device(subdev);
++
++ return regulator_enable(coil->vana);
++}
++
++static int __maybe_unused ad5398_resume(struct device *dev)
++{
++ struct i2c_client *client = container_of(dev, struct i2c_client, dev);
++ struct v4l2_subdev *subdev = i2c_get_clientdata(client);
++ struct ad5398_device *coil = to_ad5398_device(subdev);
++
++ return regulator_disable(coil->vana);
++}
++
++static int ad5398_regulator_notifier(struct notifier_block *nb,
++ unsigned long event,
++ void *ignored)
++{
++ struct ad5398_device *coil = container_of(nb, struct ad5398_device, nb);
++
++ if (event == REGULATOR_EVENT_ENABLE)
++ ad5398_power_on(coil);
++ else if (event == REGULATOR_EVENT_PRE_DISABLE)
++ ad5398_power_off(coil);
++
++ return NOTIFY_OK;
++}
++
++static int ad5398_probe(struct i2c_client *client,
++ const struct i2c_device_id *devid)
++{
++ struct ad5398_device *coil;
++ int ret;
++
++ coil = devm_kzalloc(&client->dev, sizeof(*coil), GFP_KERNEL);
++ if (!coil)
++ return -ENOMEM;
++
++ coil->vana = devm_regulator_get(&client->dev, "VANA");
++ if (IS_ERR(coil->vana)) {
++ ret = PTR_ERR(coil->vana);
++ if (ret != -EPROBE_DEFER)
++ dev_err(&client->dev, "could not get regulator for vana\n");
++ return ret;
++ }
++
++ v4l2_i2c_subdev_init(&coil->subdev, client, &ad5398_ops);
++ coil->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
++ coil->subdev.internal_ops = &ad5398_internal_ops;
++ coil->subdev.entity.function = MEDIA_ENT_F_LENS;
++ strscpy(coil->subdev.name, "ad5398 focus", sizeof(coil->subdev.name));
++
++ coil->nb.notifier_call = &ad5398_regulator_notifier;
++ ret = regulator_register_notifier(coil->vana, &coil->nb);
++ if (ret < 0)
++ return ret;
++
++ ret = media_entity_pads_init(&coil->subdev.entity, 0, NULL);
++ if (ret < 0)
++ goto cleanup2;
++
++ ret = v4l2_async_register_subdev(&coil->subdev);
++ if (ret < 0)
++ goto cleanup;
++
++ return ret;
++
++cleanup:
++ media_entity_cleanup(&coil->subdev.entity);
++cleanup2:
++ regulator_unregister_notifier(coil->vana, &coil->nb);
++ return ret;
++}
++
++static int ad5398_remove(struct i2c_client *client)
++{
++ struct v4l2_subdev *subdev = i2c_get_clientdata(client);
++ struct ad5398_device *coil = to_ad5398_device(subdev);
++
++ v4l2_async_unregister_subdev(&coil->subdev);
++ v4l2_ctrl_handler_free(&coil->ctrls);
++ media_entity_cleanup(&coil->subdev.entity);
++ return 0;
++}
++
++static const struct i2c_device_id ad5398_id_table[] = {
++ { "ad5398", 0 },
++ { }
++};
++MODULE_DEVICE_TABLE(i2c, ad5398_id_table);
++
++static const struct of_device_id ad5398_of_table[] = {
++ { .compatible = "adi,ad5398" },
++ { }
++};
++MODULE_DEVICE_TABLE(of, ad5398_of_table);
++
++static SIMPLE_DEV_PM_OPS(ad5398_pm, ad5398_suspend, ad5398_resume);
++
++static struct i2c_driver ad5398_i2c_driver = {
++ .driver = {
++ .name = "ad5398",
++ .pm = &ad5398_pm,
++ .of_match_table = ad5398_of_table,
++ },
++ .probe = ad5398_probe,
++ .remove = ad5398_remove,
++ .id_table = ad5398_id_table,
++};
++
++module_i2c_driver(ad5398_i2c_driver);
++
++MODULE_AUTHOR("Dave Stevenson <dave.stevenson@raspberrypi.com>");
++MODULE_DESCRIPTION("AD5398 camera lens driver");
++MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.25.1) at 2024-09-19 21:04:52 +0000