329 строки
8.1 KiB
C
329 строки
8.1 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2018 Intel Corporation
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#include <linux/acpi.h>
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#include <linux/delay.h>
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#include <linux/i2c.h>
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#include <linux/iopoll.h>
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#include <linux/module.h>
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#include <linux/pm_runtime.h>
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#include <media/v4l2-ctrls.h>
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#include <media/v4l2-device.h>
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#define DW9807_MAX_FOCUS_POS 1023
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/*
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* This sets the minimum granularity for the focus positions.
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* A value of 1 gives maximum accuracy for a desired focus position.
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*/
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#define DW9807_FOCUS_STEPS 1
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/*
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* This acts as the minimum granularity of lens movement.
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* Keep this value power of 2, so the control steps can be
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* uniformly adjusted for gradual lens movement, with desired
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* number of control steps.
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*/
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#define DW9807_CTRL_STEPS 16
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#define DW9807_CTRL_DELAY_US 1000
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#define DW9807_CTL_ADDR 0x02
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/*
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* DW9807 separates two registers to control the VCM position.
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* One for MSB value, another is LSB value.
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*/
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#define DW9807_MSB_ADDR 0x03
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#define DW9807_LSB_ADDR 0x04
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#define DW9807_STATUS_ADDR 0x05
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#define DW9807_MODE_ADDR 0x06
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#define DW9807_RESONANCE_ADDR 0x07
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#define MAX_RETRY 10
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struct dw9807_device {
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struct v4l2_ctrl_handler ctrls_vcm;
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struct v4l2_subdev sd;
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u16 current_val;
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};
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static inline struct dw9807_device *sd_to_dw9807_vcm(
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struct v4l2_subdev *subdev)
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{
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return container_of(subdev, struct dw9807_device, sd);
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}
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static int dw9807_i2c_check(struct i2c_client *client)
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{
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const char status_addr = DW9807_STATUS_ADDR;
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char status_result;
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int ret;
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ret = i2c_master_send(client, &status_addr, sizeof(status_addr));
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if (ret < 0) {
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dev_err(&client->dev, "I2C write STATUS address fail ret = %d\n",
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ret);
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return ret;
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}
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ret = i2c_master_recv(client, &status_result, sizeof(status_result));
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if (ret < 0) {
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dev_err(&client->dev, "I2C read STATUS value fail ret = %d\n",
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ret);
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return ret;
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}
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return status_result;
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}
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static int dw9807_set_dac(struct i2c_client *client, u16 data)
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{
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const char tx_data[3] = {
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DW9807_MSB_ADDR, ((data >> 8) & 0x03), (data & 0xff)
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};
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int val, ret;
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/*
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* According to the datasheet, need to check the bus status before we
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* write VCM position. This ensure that we really write the value
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* into the register
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*/
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ret = readx_poll_timeout(dw9807_i2c_check, client, val, val <= 0,
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DW9807_CTRL_DELAY_US, MAX_RETRY * DW9807_CTRL_DELAY_US);
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if (ret || val < 0) {
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if (ret) {
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dev_warn(&client->dev,
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"Cannot do the write operation because VCM is busy\n");
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}
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return ret ? -EBUSY : val;
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}
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/* Write VCM position to registers */
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ret = i2c_master_send(client, tx_data, sizeof(tx_data));
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if (ret < 0) {
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dev_err(&client->dev,
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"I2C write MSB fail ret=%d\n", ret);
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return ret;
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}
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return 0;
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}
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static int dw9807_set_ctrl(struct v4l2_ctrl *ctrl)
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{
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struct dw9807_device *dev_vcm = container_of(ctrl->handler,
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struct dw9807_device, ctrls_vcm);
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if (ctrl->id == V4L2_CID_FOCUS_ABSOLUTE) {
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struct i2c_client *client = v4l2_get_subdevdata(&dev_vcm->sd);
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dev_vcm->current_val = ctrl->val;
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return dw9807_set_dac(client, ctrl->val);
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}
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return -EINVAL;
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}
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static const struct v4l2_ctrl_ops dw9807_vcm_ctrl_ops = {
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.s_ctrl = dw9807_set_ctrl,
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};
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static int dw9807_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
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{
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int rval;
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rval = pm_runtime_get_sync(sd->dev);
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if (rval < 0) {
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pm_runtime_put_noidle(sd->dev);
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return rval;
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}
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return 0;
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}
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static int dw9807_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
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{
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pm_runtime_put(sd->dev);
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return 0;
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}
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static const struct v4l2_subdev_internal_ops dw9807_int_ops = {
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.open = dw9807_open,
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.close = dw9807_close,
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};
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static const struct v4l2_subdev_ops dw9807_ops = { };
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static void dw9807_subdev_cleanup(struct dw9807_device *dw9807_dev)
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{
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v4l2_async_unregister_subdev(&dw9807_dev->sd);
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v4l2_ctrl_handler_free(&dw9807_dev->ctrls_vcm);
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media_entity_cleanup(&dw9807_dev->sd.entity);
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}
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static int dw9807_init_controls(struct dw9807_device *dev_vcm)
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{
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struct v4l2_ctrl_handler *hdl = &dev_vcm->ctrls_vcm;
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const struct v4l2_ctrl_ops *ops = &dw9807_vcm_ctrl_ops;
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struct i2c_client *client = v4l2_get_subdevdata(&dev_vcm->sd);
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v4l2_ctrl_handler_init(hdl, 1);
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v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FOCUS_ABSOLUTE,
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0, DW9807_MAX_FOCUS_POS, DW9807_FOCUS_STEPS, 0);
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dev_vcm->sd.ctrl_handler = hdl;
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if (hdl->error) {
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dev_err(&client->dev, "%s fail error: 0x%x\n",
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__func__, hdl->error);
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return hdl->error;
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}
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return 0;
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}
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static int dw9807_probe(struct i2c_client *client)
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{
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struct dw9807_device *dw9807_dev;
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int rval;
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dw9807_dev = devm_kzalloc(&client->dev, sizeof(*dw9807_dev),
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GFP_KERNEL);
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if (dw9807_dev == NULL)
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return -ENOMEM;
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v4l2_i2c_subdev_init(&dw9807_dev->sd, client, &dw9807_ops);
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dw9807_dev->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
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dw9807_dev->sd.internal_ops = &dw9807_int_ops;
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rval = dw9807_init_controls(dw9807_dev);
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if (rval)
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goto err_cleanup;
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rval = media_entity_pads_init(&dw9807_dev->sd.entity, 0, NULL);
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if (rval < 0)
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goto err_cleanup;
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dw9807_dev->sd.entity.function = MEDIA_ENT_F_LENS;
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rval = v4l2_async_register_subdev(&dw9807_dev->sd);
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if (rval < 0)
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goto err_cleanup;
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pm_runtime_set_active(&client->dev);
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pm_runtime_enable(&client->dev);
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pm_runtime_idle(&client->dev);
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return 0;
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err_cleanup:
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dw9807_subdev_cleanup(dw9807_dev);
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return rval;
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}
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static int dw9807_remove(struct i2c_client *client)
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{
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struct v4l2_subdev *sd = i2c_get_clientdata(client);
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struct dw9807_device *dw9807_dev = sd_to_dw9807_vcm(sd);
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pm_runtime_disable(&client->dev);
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dw9807_subdev_cleanup(dw9807_dev);
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return 0;
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}
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/*
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* This function sets the vcm position, so it consumes least current
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* The lens position is gradually moved in units of DW9807_CTRL_STEPS,
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* to make the movements smoothly.
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*/
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static int __maybe_unused dw9807_vcm_suspend(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct v4l2_subdev *sd = i2c_get_clientdata(client);
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struct dw9807_device *dw9807_dev = sd_to_dw9807_vcm(sd);
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const char tx_data[2] = { DW9807_CTL_ADDR, 0x01 };
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int ret, val;
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for (val = dw9807_dev->current_val & ~(DW9807_CTRL_STEPS - 1);
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val >= 0; val -= DW9807_CTRL_STEPS) {
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ret = dw9807_set_dac(client, val);
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if (ret)
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dev_err_once(dev, "%s I2C failure: %d", __func__, ret);
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usleep_range(DW9807_CTRL_DELAY_US, DW9807_CTRL_DELAY_US + 10);
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}
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/* Power down */
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ret = i2c_master_send(client, tx_data, sizeof(tx_data));
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if (ret < 0) {
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dev_err(&client->dev, "I2C write CTL fail ret = %d\n", ret);
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return ret;
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}
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return 0;
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}
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/*
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* This function sets the vcm position to the value set by the user
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* through v4l2_ctrl_ops s_ctrl handler
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* The lens position is gradually moved in units of DW9807_CTRL_STEPS,
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* to make the movements smoothly.
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*/
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static int __maybe_unused dw9807_vcm_resume(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct v4l2_subdev *sd = i2c_get_clientdata(client);
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struct dw9807_device *dw9807_dev = sd_to_dw9807_vcm(sd);
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const char tx_data[2] = { DW9807_CTL_ADDR, 0x00 };
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int ret, val;
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/* Power on */
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ret = i2c_master_send(client, tx_data, sizeof(tx_data));
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if (ret < 0) {
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dev_err(&client->dev, "I2C write CTL fail ret = %d\n", ret);
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return ret;
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}
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for (val = dw9807_dev->current_val % DW9807_CTRL_STEPS;
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val < dw9807_dev->current_val + DW9807_CTRL_STEPS - 1;
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val += DW9807_CTRL_STEPS) {
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ret = dw9807_set_dac(client, val);
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if (ret)
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dev_err_ratelimited(dev, "%s I2C failure: %d",
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__func__, ret);
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usleep_range(DW9807_CTRL_DELAY_US, DW9807_CTRL_DELAY_US + 10);
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}
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return 0;
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}
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static const struct of_device_id dw9807_of_table[] = {
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{ .compatible = "dongwoon,dw9807-vcm" },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, dw9807_of_table);
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static const struct dev_pm_ops dw9807_pm_ops = {
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SET_SYSTEM_SLEEP_PM_OPS(dw9807_vcm_suspend, dw9807_vcm_resume)
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SET_RUNTIME_PM_OPS(dw9807_vcm_suspend, dw9807_vcm_resume, NULL)
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};
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static struct i2c_driver dw9807_i2c_driver = {
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.driver = {
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.name = "dw9807",
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.pm = &dw9807_pm_ops,
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.of_match_table = dw9807_of_table,
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},
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.probe_new = dw9807_probe,
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.remove = dw9807_remove,
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};
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module_i2c_driver(dw9807_i2c_driver);
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MODULE_AUTHOR("Chiang, Alan <alanx.chiang@intel.com>");
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MODULE_DESCRIPTION("DW9807 VCM driver");
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MODULE_LICENSE("GPL v2");
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