media: dw9807: Add dw9807 vcm driver (5b0a2054) · Commits · 戴 / test

MAINTAINERS

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Original line number	Diff line number	Diff line
		@@ -4403,6 +4403,13 @@ T: git git://linuxtv.org/media_tree.git
		S: Maintained
		F: drivers/media/i2c/dw9714.c

		DONGWOON DW9807 LENS VOICE COIL DRIVER
		M: Sakari Ailus <sakari.ailus@linux.intel.com>
		L: linux-media@vger.kernel.org
		T: git git://linuxtv.org/media_tree.git
		S: Maintained
		F: drivers/media/i2c/dw9807.c

		DOUBLETALK DRIVER
		M: "James R. Van Zandt" <jrv@vanzandt.mv.com>
		L: blinux-list@redhat.com

drivers/media/i2c/Kconfig

+10 −0

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		@@ -336,6 +336,16 @@ config VIDEO_DW9714
		capability. This is designed for linear control of
		voice coil motors, controlled via I2C serial interface.

		config VIDEO_DW9807
		tristate "DW9807 lens voice coil support"
		depends on I2C && VIDEO_V4L2 && MEDIA_CONTROLLER
		depends on VIDEO_V4L2_SUBDEV_API
		---help---
		This is a driver for the DW9807 camera lens voice coil.
		DW9807 is a 10 bit DAC with 100mA output current sink
		capability. This is designed for linear control of
		voice coil motors, controlled via I2C serial interface.

		config VIDEO_SAA7110
		tristate "Philips SAA7110 video decoder"
		depends on VIDEO_V4L2 && I2C

drivers/media/i2c/Makefile

+1 −0

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		@@ -24,6 +24,7 @@ obj-$(CONFIG_VIDEO_SAA7185) += saa7185.o
		obj-$(CONFIG_VIDEO_SAA6752HS) += saa6752hs.o
		obj-$(CONFIG_VIDEO_AD5820) += ad5820.o
		obj-$(CONFIG_VIDEO_DW9714) += dw9714.o
		obj-$(CONFIG_VIDEO_DW9807) += dw9807.o
		obj-$(CONFIG_VIDEO_ADV7170) += adv7170.o
		obj-$(CONFIG_VIDEO_ADV7175) += adv7175.o
		obj-$(CONFIG_VIDEO_ADV7180) += adv7180.o

drivers/media/i2c/dw9807.c

0 → 100644

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Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: GPL-2.0
		// Copyright (C) 2018 Intel Corporation

		#include <linux/acpi.h>
		#include <linux/delay.h>
		#include <linux/i2c.h>
		#include <linux/iopoll.h>
		#include <linux/module.h>
		#include <linux/pm_runtime.h>
		#include <media/v4l2-ctrls.h>
		#include <media/v4l2-device.h>

		#define DW9807_MAX_FOCUS_POS 1023
		/*
		* This sets the minimum granularity for the focus positions.
		* A value of 1 gives maximum accuracy for a desired focus position.
		*/
		#define DW9807_FOCUS_STEPS 1
		/*
		* This acts as the minimum granularity of lens movement.
		* Keep this value power of 2, so the control steps can be
		* uniformly adjusted for gradual lens movement, with desired
		* number of control steps.
		*/
		#define DW9807_CTRL_STEPS 16
		#define DW9807_CTRL_DELAY_US 1000

		#define DW9807_CTL_ADDR 0x02
		/*
		* DW9807 separates two registers to control the VCM position.
		* One for MSB value, another is LSB value.
		*/
		#define DW9807_MSB_ADDR 0x03
		#define DW9807_LSB_ADDR 0x04
		#define DW9807_STATUS_ADDR 0x05
		#define DW9807_MODE_ADDR 0x06
		#define DW9807_RESONANCE_ADDR 0x07

		#define MAX_RETRY 10

		struct dw9807_device {
		struct v4l2_ctrl_handler ctrls_vcm;
		struct v4l2_subdev sd;
		u16 current_val;
		};

		static inline struct dw9807_device *sd_to_dw9807_vcm(
		struct v4l2_subdev *subdev)
		{
		return container_of(subdev, struct dw9807_device, sd);
		}

		static int dw9807_i2c_check(struct i2c_client *client)
		{
		const char status_addr = DW9807_STATUS_ADDR;
		char status_result;
		int ret;

		ret = i2c_master_send(client, &status_addr, sizeof(status_addr));
		if (ret < 0) {
		dev_err(&client->dev, "I2C write STATUS address fail ret = %d\n",
		ret);
		return ret;
		}

		ret = i2c_master_recv(client, &status_result, sizeof(status_result));
		if (ret < 0) {
		dev_err(&client->dev, "I2C read STATUS value fail ret = %d\n",
		ret);
		return ret;
		}

		return status_result;
		}

		static int dw9807_set_dac(struct i2c_client *client, u16 data)
		{
		const char tx_data[3] = {
		DW9807_MSB_ADDR, ((data >> 8) & 0x03), (data & 0xff)
		};
		int val, ret;

		/*
		* According to the datasheet, need to check the bus status before we
		* write VCM position. This ensure that we really write the value
		* into the register
		*/
		ret = readx_poll_timeout(dw9807_i2c_check, client, val, val <= 0,
		DW9807_CTRL_DELAY_US, MAX_RETRY * DW9807_CTRL_DELAY_US);

		if (ret \|\| val < 0) {
		if (ret) {
		dev_warn(&client->dev,
		"Cannot do the write operation because VCM is busy\n");
		}

		return ret ? -EBUSY : val;
		}

		/* Write VCM position to registers */
		ret = i2c_master_send(client, tx_data, sizeof(tx_data));
		if (ret < 0) {
		dev_err(&client->dev,
		"I2C write MSB fail ret=%d\n", ret);

		return ret;
		}

		return 0;
		}

		static int dw9807_set_ctrl(struct v4l2_ctrl *ctrl)
		{
		struct dw9807_device *dev_vcm = container_of(ctrl->handler,
		struct dw9807_device, ctrls_vcm);

		if (ctrl->id == V4L2_CID_FOCUS_ABSOLUTE) {
		struct i2c_client *client = v4l2_get_subdevdata(&dev_vcm->sd);

		dev_vcm->current_val = ctrl->val;
		return dw9807_set_dac(client, ctrl->val);
		}

		return -EINVAL;
		}

		static const struct v4l2_ctrl_ops dw9807_vcm_ctrl_ops = {
		.s_ctrl = dw9807_set_ctrl,
		};

		static int dw9807_open(struct v4l2_subdev sd, struct v4l2_subdev_fh fh)
		{
		int rval;

		rval = pm_runtime_get_sync(sd->dev);
		if (rval < 0) {
		pm_runtime_put_noidle(sd->dev);
		return rval;
		}

		return 0;
		}

		static int dw9807_close(struct v4l2_subdev sd, struct v4l2_subdev_fh fh)
		{
		pm_runtime_put(sd->dev);

		return 0;
		}

		static const struct v4l2_subdev_internal_ops dw9807_int_ops = {
		.open = dw9807_open,
		.close = dw9807_close,
		};

		static const struct v4l2_subdev_ops dw9807_ops = { };

		static void dw9807_subdev_cleanup(struct dw9807_device *dw9807_dev)
		{
		v4l2_async_unregister_subdev(&dw9807_dev->sd);
		v4l2_ctrl_handler_free(&dw9807_dev->ctrls_vcm);
		media_entity_cleanup(&dw9807_dev->sd.entity);
		}

		static int dw9807_init_controls(struct dw9807_device *dev_vcm)
		{
		struct v4l2_ctrl_handler *hdl = &dev_vcm->ctrls_vcm;
		const struct v4l2_ctrl_ops *ops = &dw9807_vcm_ctrl_ops;
		struct i2c_client *client = v4l2_get_subdevdata(&dev_vcm->sd);

		v4l2_ctrl_handler_init(hdl, 1);

		v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FOCUS_ABSOLUTE,
		0, DW9807_MAX_FOCUS_POS, DW9807_FOCUS_STEPS, 0);

		dev_vcm->sd.ctrl_handler = hdl;
		if (hdl->error) {
		dev_err(&client->dev, "%s fail error: 0x%x\n",
		__func__, hdl->error);
		return hdl->error;
		}

		return 0;
		}

		static int dw9807_probe(struct i2c_client *client)
		{
		struct dw9807_device *dw9807_dev;
		int rval;

		dw9807_dev = devm_kzalloc(&client->dev, sizeof(*dw9807_dev),
		GFP_KERNEL);
		if (dw9807_dev == NULL)
		return -ENOMEM;

		v4l2_i2c_subdev_init(&dw9807_dev->sd, client, &dw9807_ops);
		dw9807_dev->sd.flags \|= V4L2_SUBDEV_FL_HAS_DEVNODE;
		dw9807_dev->sd.internal_ops = &dw9807_int_ops;

		rval = dw9807_init_controls(dw9807_dev);
		if (rval)
		goto err_cleanup;

		rval = media_entity_pads_init(&dw9807_dev->sd.entity, 0, NULL);
		if (rval < 0)
		goto err_cleanup;

		dw9807_dev->sd.entity.function = MEDIA_ENT_F_LENS;

		rval = v4l2_async_register_subdev(&dw9807_dev->sd);
		if (rval < 0)
		goto err_cleanup;

		pm_runtime_set_active(&client->dev);
		pm_runtime_enable(&client->dev);
		pm_runtime_idle(&client->dev);

		return 0;

		err_cleanup:
		dw9807_subdev_cleanup(dw9807_dev);

		return rval;
		}

		static int dw9807_remove(struct i2c_client *client)
		{
		struct v4l2_subdev *sd = i2c_get_clientdata(client);
		struct dw9807_device *dw9807_dev = sd_to_dw9807_vcm(sd);

		pm_runtime_disable(&client->dev);
		pm_runtime_set_suspended(&client->dev);

		dw9807_subdev_cleanup(dw9807_dev);

		return 0;
		}

		/*
		* This function sets the vcm position, so it consumes least current
		* The lens position is gradually moved in units of DW9807_CTRL_STEPS,
		* to make the movements smoothly.
		*/
		static int __maybe_unused dw9807_vcm_suspend(struct device *dev)
		{
		struct i2c_client *client = to_i2c_client(dev);
		struct v4l2_subdev *sd = i2c_get_clientdata(client);
		struct dw9807_device *dw9807_dev = sd_to_dw9807_vcm(sd);
		const char tx_data[2] = { DW9807_CTL_ADDR, 0x01 };
		int ret, val;

		for (val = dw9807_dev->current_val & ~(DW9807_CTRL_STEPS - 1);
		val >= 0; val -= DW9807_CTRL_STEPS) {
		ret = dw9807_set_dac(client, val);
		if (ret)
		dev_err_once(dev, "%s I2C failure: %d", __func__, ret);
		usleep_range(DW9807_CTRL_DELAY_US, DW9807_CTRL_DELAY_US + 10);
		}

		/* Power down */
		ret = i2c_master_send(client, tx_data, sizeof(tx_data));
		if (ret < 0) {
		dev_err(&client->dev, "I2C write CTL fail ret = %d\n", ret);
		return ret;
		}

		return 0;
		}

		/*
		* This function sets the vcm position to the value set by the user
		* through v4l2_ctrl_ops s_ctrl handler
		* The lens position is gradually moved in units of DW9807_CTRL_STEPS,
		* to make the movements smoothly.
		*/
		static int __maybe_unused dw9807_vcm_resume(struct device *dev)
		{
		struct i2c_client *client = to_i2c_client(dev);
		struct v4l2_subdev *sd = i2c_get_clientdata(client);
		struct dw9807_device *dw9807_dev = sd_to_dw9807_vcm(sd);
		const char tx_data[2] = { DW9807_CTL_ADDR, 0x00 };
		int ret, val;

		/* Power on */
		ret = i2c_master_send(client, tx_data, sizeof(tx_data));
		if (ret < 0) {
		dev_err(&client->dev, "I2C write CTL fail ret = %d\n", ret);
		return ret;
		}

		for (val = dw9807_dev->current_val % DW9807_CTRL_STEPS;
		val < dw9807_dev->current_val + DW9807_CTRL_STEPS - 1;
		val += DW9807_CTRL_STEPS) {
		ret = dw9807_set_dac(client, val);
		if (ret)
		dev_err_ratelimited(dev, "%s I2C failure: %d",
		__func__, ret);
		usleep_range(DW9807_CTRL_DELAY_US, DW9807_CTRL_DELAY_US + 10);
		}

		return 0;
		}

		static const struct of_device_id dw9807_of_table[] = {
		{ .compatible = "dongwoon,dw9807-vcm" },
		{ /* sentinel */ }
		};
		MODULE_DEVICE_TABLE(of, dw9807_of_table);

		static const struct dev_pm_ops dw9807_pm_ops = {
		SET_SYSTEM_SLEEP_PM_OPS(dw9807_vcm_suspend, dw9807_vcm_resume)
		SET_RUNTIME_PM_OPS(dw9807_vcm_suspend, dw9807_vcm_resume, NULL)
		};

		static struct i2c_driver dw9807_i2c_driver = {
		.driver = {
		.name = "dw9807",
		.pm = &dw9807_pm_ops,
		.of_match_table = dw9807_of_table,
		},
		.probe_new = dw9807_probe,
		.remove = dw9807_remove,
		};

		module_i2c_driver(dw9807_i2c_driver);

		MODULE_AUTHOR("Chiang, Alan <alanx.chiang@intel.com>");
		MODULE_DESCRIPTION("DW9807 VCM driver");
		MODULE_LICENSE("GPL v2");

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