318 lines
8.0 KiB
C
318 lines
8.0 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/module.h>
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#include <linux/pm_runtime.h>
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#include <linux/regulator/consumer.h>
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#include <media/v4l2-ctrls.h>
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#include <media/v4l2-device.h>
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#define AK7375_MAX_FOCUS_POS 4095
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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 AK7375_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 AK7375_CTRL_STEPS 64
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#define AK7375_CTRL_DELAY_US 1000
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/*
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* The vcm may take up 10 ms (tDELAY) to power on and start taking
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* I2C messages. Based on AK7371 datasheet.
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*/
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#define AK7375_POWER_DELAY_US 10000
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#define AK7375_REG_POSITION 0x0
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#define AK7375_REG_CONT 0x2
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#define AK7375_MODE_ACTIVE 0x0
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#define AK7375_MODE_STANDBY 0x40
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static const char * const ak7375_supply_names[] = {
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"vdd",
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"vio",
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};
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/* ak7375 device structure */
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struct ak7375_device {
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struct v4l2_ctrl_handler ctrls_vcm;
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struct v4l2_subdev sd;
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struct v4l2_ctrl *focus;
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struct regulator_bulk_data supplies[ARRAY_SIZE(ak7375_supply_names)];
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/* active or standby mode */
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bool active;
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};
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static inline struct ak7375_device *to_ak7375_vcm(struct v4l2_ctrl *ctrl)
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{
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return container_of(ctrl->handler, struct ak7375_device, ctrls_vcm);
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}
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static inline struct ak7375_device *sd_to_ak7375_vcm(struct v4l2_subdev *subdev)
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{
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return container_of(subdev, struct ak7375_device, sd);
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}
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static int ak7375_i2c_write(struct ak7375_device *ak7375,
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u8 addr, u16 data, u8 size)
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{
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struct i2c_client *client = v4l2_get_subdevdata(&ak7375->sd);
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u8 buf[3];
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int ret;
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if (size != 1 && size != 2)
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return -EINVAL;
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buf[0] = addr;
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buf[size] = data & 0xff;
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if (size == 2)
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buf[1] = (data >> 8) & 0xff;
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ret = i2c_master_send(client, (const char *)buf, size + 1);
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if (ret < 0)
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return ret;
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if (ret != size + 1)
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return -EIO;
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return 0;
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}
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static int ak7375_set_ctrl(struct v4l2_ctrl *ctrl)
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{
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struct ak7375_device *dev_vcm = to_ak7375_vcm(ctrl);
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if (ctrl->id == V4L2_CID_FOCUS_ABSOLUTE)
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return ak7375_i2c_write(dev_vcm, AK7375_REG_POSITION,
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ctrl->val << 4, 2);
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return -EINVAL;
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}
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static const struct v4l2_ctrl_ops ak7375_vcm_ctrl_ops = {
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.s_ctrl = ak7375_set_ctrl,
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};
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static int ak7375_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
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{
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return pm_runtime_resume_and_get(sd->dev);
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}
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static int ak7375_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 ak7375_int_ops = {
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.open = ak7375_open,
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.close = ak7375_close,
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};
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static const struct v4l2_subdev_ops ak7375_ops = { };
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static void ak7375_subdev_cleanup(struct ak7375_device *ak7375_dev)
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{
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v4l2_async_unregister_subdev(&ak7375_dev->sd);
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v4l2_ctrl_handler_free(&ak7375_dev->ctrls_vcm);
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media_entity_cleanup(&ak7375_dev->sd.entity);
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}
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static int ak7375_init_controls(struct ak7375_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 = &ak7375_vcm_ctrl_ops;
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v4l2_ctrl_handler_init(hdl, 1);
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dev_vcm->focus = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FOCUS_ABSOLUTE,
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0, AK7375_MAX_FOCUS_POS, AK7375_FOCUS_STEPS, 0);
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if (hdl->error)
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dev_err(dev_vcm->sd.dev, "%s fail error: 0x%x\n",
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__func__, hdl->error);
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dev_vcm->sd.ctrl_handler = hdl;
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return hdl->error;
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}
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static int ak7375_probe(struct i2c_client *client)
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{
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struct ak7375_device *ak7375_dev;
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int ret;
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unsigned int i;
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ak7375_dev = devm_kzalloc(&client->dev, sizeof(*ak7375_dev),
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GFP_KERNEL);
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if (!ak7375_dev)
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return -ENOMEM;
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for (i = 0; i < ARRAY_SIZE(ak7375_supply_names); i++)
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ak7375_dev->supplies[i].supply = ak7375_supply_names[i];
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ret = devm_regulator_bulk_get(&client->dev,
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ARRAY_SIZE(ak7375_supply_names),
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ak7375_dev->supplies);
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if (ret) {
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dev_err_probe(&client->dev, ret, "Failed to get regulators\n");
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return ret;
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}
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v4l2_i2c_subdev_init(&ak7375_dev->sd, client, &ak7375_ops);
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ak7375_dev->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
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ak7375_dev->sd.internal_ops = &ak7375_int_ops;
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ak7375_dev->sd.entity.function = MEDIA_ENT_F_LENS;
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ret = ak7375_init_controls(ak7375_dev);
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if (ret)
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goto err_cleanup;
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ret = media_entity_pads_init(&ak7375_dev->sd.entity, 0, NULL);
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if (ret < 0)
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goto err_cleanup;
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ret = v4l2_async_register_subdev(&ak7375_dev->sd);
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if (ret < 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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v4l2_ctrl_handler_free(&ak7375_dev->ctrls_vcm);
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media_entity_cleanup(&ak7375_dev->sd.entity);
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return ret;
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}
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static void ak7375_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 ak7375_device *ak7375_dev = sd_to_ak7375_vcm(sd);
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ak7375_subdev_cleanup(ak7375_dev);
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pm_runtime_disable(&client->dev);
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pm_runtime_set_suspended(&client->dev);
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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 AK7375_CTRL_STEPS,
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* to make the movements smoothly.
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*/
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static int __maybe_unused ak7375_vcm_suspend(struct device *dev)
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{
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struct v4l2_subdev *sd = dev_get_drvdata(dev);
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struct ak7375_device *ak7375_dev = sd_to_ak7375_vcm(sd);
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int ret, val;
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if (!ak7375_dev->active)
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return 0;
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for (val = ak7375_dev->focus->val & ~(AK7375_CTRL_STEPS - 1);
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val >= 0; val -= AK7375_CTRL_STEPS) {
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ret = ak7375_i2c_write(ak7375_dev, AK7375_REG_POSITION,
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val << 4, 2);
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if (ret)
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dev_err_once(dev, "%s I2C failure: %d\n",
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__func__, ret);
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usleep_range(AK7375_CTRL_DELAY_US, AK7375_CTRL_DELAY_US + 10);
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}
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ret = ak7375_i2c_write(ak7375_dev, AK7375_REG_CONT,
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AK7375_MODE_STANDBY, 1);
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if (ret)
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dev_err(dev, "%s I2C failure: %d\n", __func__, ret);
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ret = regulator_bulk_disable(ARRAY_SIZE(ak7375_supply_names),
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ak7375_dev->supplies);
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if (ret)
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return ret;
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ak7375_dev->active = false;
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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 AK7375_CTRL_STEPS,
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* to make the movements smoothly.
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*/
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static int __maybe_unused ak7375_vcm_resume(struct device *dev)
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{
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struct v4l2_subdev *sd = dev_get_drvdata(dev);
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struct ak7375_device *ak7375_dev = sd_to_ak7375_vcm(sd);
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int ret, val;
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if (ak7375_dev->active)
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return 0;
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ret = regulator_bulk_enable(ARRAY_SIZE(ak7375_supply_names),
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ak7375_dev->supplies);
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if (ret)
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return ret;
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/* Wait for vcm to become ready */
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usleep_range(AK7375_POWER_DELAY_US, AK7375_POWER_DELAY_US + 500);
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ret = ak7375_i2c_write(ak7375_dev, AK7375_REG_CONT,
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AK7375_MODE_ACTIVE, 1);
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if (ret) {
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dev_err(dev, "%s I2C failure: %d\n", __func__, ret);
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return ret;
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}
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for (val = ak7375_dev->focus->val % AK7375_CTRL_STEPS;
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val <= ak7375_dev->focus->val;
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val += AK7375_CTRL_STEPS) {
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ret = ak7375_i2c_write(ak7375_dev, AK7375_REG_POSITION,
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val << 4, 2);
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if (ret)
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dev_err_ratelimited(dev, "%s I2C failure: %d\n",
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__func__, ret);
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usleep_range(AK7375_CTRL_DELAY_US, AK7375_CTRL_DELAY_US + 10);
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}
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ak7375_dev->active = true;
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return 0;
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}
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static const struct of_device_id ak7375_of_table[] = {
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{ .compatible = "asahi-kasei,ak7375" },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, ak7375_of_table);
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static const struct dev_pm_ops ak7375_pm_ops = {
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SET_SYSTEM_SLEEP_PM_OPS(ak7375_vcm_suspend, ak7375_vcm_resume)
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SET_RUNTIME_PM_OPS(ak7375_vcm_suspend, ak7375_vcm_resume, NULL)
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};
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static struct i2c_driver ak7375_i2c_driver = {
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.driver = {
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.name = "ak7375",
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.pm = &ak7375_pm_ops,
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.of_match_table = ak7375_of_table,
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},
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.probe_new = ak7375_probe,
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.remove = ak7375_remove,
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};
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module_i2c_driver(ak7375_i2c_driver);
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MODULE_AUTHOR("Tianshu Qiu <tian.shu.qiu@intel.com>");
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MODULE_AUTHOR("Bingbu Cao <bingbu.cao@intel.com>");
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MODULE_DESCRIPTION("AK7375 VCM driver");
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MODULE_LICENSE("GPL v2");
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