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- // 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)
- {
- return pm_runtime_resume_and_get(sd->dev);
- }
- 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:
- v4l2_ctrl_handler_free(&dw9807_dev->ctrls_vcm);
- media_entity_cleanup(&dw9807_dev->sd.entity);
- return rval;
- }
- static void 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);
- dw9807_subdev_cleanup(dw9807_dev);
- }
- /*
- * 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" },
- /* Compatibility for older firmware, NEVER USE THIS IN FIRMWARE! */
- { .compatible = "dongwoon,dw9807" },
- { /* 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");
- MODULE_DESCRIPTION("DW9807 VCM driver");
- MODULE_LICENSE("GPL v2");
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