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289 lines
7.1 KiB
289 lines
7.1 KiB
// 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 <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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#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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/* 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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/* 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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int ret; |
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ret = pm_runtime_get_sync(sd->dev); |
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if (ret < 0) { |
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pm_runtime_put_noidle(sd->dev); |
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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 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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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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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 int 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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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 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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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 = 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 <[email protected]>"); |
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MODULE_AUTHOR("Bingbu Cao <[email protected]>"); |
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MODULE_DESCRIPTION("AK7375 VCM driver"); |
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MODULE_LICENSE("GPL v2");
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