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315 lines
8.3 KiB
315 lines
8.3 KiB
// SPDX-License-Identifier: GPL-2.0 |
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// Copyright (c) 2015--2017 Intel Corporation. |
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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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#include <media/v4l2-event.h> |
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#define DW9714_NAME "dw9714" |
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#define DW9714_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 DW9714_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 DW9714_CTRL_STEPS 16 |
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#define DW9714_CTRL_DELAY_US 1000 |
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/* |
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* S[3:2] = 0x00, codes per step for "Linear Slope Control" |
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* S[1:0] = 0x00, step period |
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*/ |
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#define DW9714_DEFAULT_S 0x0 |
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#define DW9714_VAL(data, s) ((data) << 4 | (s)) |
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/* dw9714 device structure */ |
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struct dw9714_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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struct regulator *vcc; |
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}; |
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static inline struct dw9714_device *to_dw9714_vcm(struct v4l2_ctrl *ctrl) |
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{ |
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return container_of(ctrl->handler, struct dw9714_device, ctrls_vcm); |
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} |
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static inline struct dw9714_device *sd_to_dw9714_vcm(struct v4l2_subdev *subdev) |
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{ |
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return container_of(subdev, struct dw9714_device, sd); |
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} |
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static int dw9714_i2c_write(struct i2c_client *client, u16 data) |
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{ |
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int ret; |
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__be16 val = cpu_to_be16(data); |
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ret = i2c_master_send(client, (const char *)&val, sizeof(val)); |
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if (ret != sizeof(val)) { |
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dev_err(&client->dev, "I2C write fail\n"); |
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return -EIO; |
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} |
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return 0; |
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} |
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static int dw9714_t_focus_vcm(struct dw9714_device *dw9714_dev, u16 val) |
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{ |
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struct i2c_client *client = v4l2_get_subdevdata(&dw9714_dev->sd); |
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dw9714_dev->current_val = val; |
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return dw9714_i2c_write(client, DW9714_VAL(val, DW9714_DEFAULT_S)); |
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} |
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static int dw9714_set_ctrl(struct v4l2_ctrl *ctrl) |
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{ |
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struct dw9714_device *dev_vcm = to_dw9714_vcm(ctrl); |
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if (ctrl->id == V4L2_CID_FOCUS_ABSOLUTE) |
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return dw9714_t_focus_vcm(dev_vcm, ctrl->val); |
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return -EINVAL; |
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} |
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static const struct v4l2_ctrl_ops dw9714_vcm_ctrl_ops = { |
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.s_ctrl = dw9714_set_ctrl, |
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}; |
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static int dw9714_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 dw9714_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 dw9714_int_ops = { |
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.open = dw9714_open, |
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.close = dw9714_close, |
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}; |
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static const struct v4l2_subdev_core_ops dw9714_core_ops = { |
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.log_status = v4l2_ctrl_subdev_log_status, |
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.subscribe_event = v4l2_ctrl_subdev_subscribe_event, |
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.unsubscribe_event = v4l2_event_subdev_unsubscribe, |
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}; |
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static const struct v4l2_subdev_ops dw9714_ops = { |
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.core = &dw9714_core_ops, |
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}; |
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static void dw9714_subdev_cleanup(struct dw9714_device *dw9714_dev) |
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{ |
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v4l2_async_unregister_subdev(&dw9714_dev->sd); |
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v4l2_ctrl_handler_free(&dw9714_dev->ctrls_vcm); |
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media_entity_cleanup(&dw9714_dev->sd.entity); |
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} |
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static int dw9714_init_controls(struct dw9714_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 = &dw9714_vcm_ctrl_ops; |
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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, DW9714_MAX_FOCUS_POS, DW9714_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 dw9714_probe(struct i2c_client *client) |
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{ |
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struct dw9714_device *dw9714_dev; |
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int rval; |
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dw9714_dev = devm_kzalloc(&client->dev, sizeof(*dw9714_dev), |
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GFP_KERNEL); |
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if (dw9714_dev == NULL) |
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return -ENOMEM; |
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dw9714_dev->vcc = devm_regulator_get(&client->dev, "vcc"); |
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if (IS_ERR(dw9714_dev->vcc)) |
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return PTR_ERR(dw9714_dev->vcc); |
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rval = regulator_enable(dw9714_dev->vcc); |
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if (rval < 0) { |
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dev_err(&client->dev, "failed to enable vcc: %d\n", rval); |
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return rval; |
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} |
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v4l2_i2c_subdev_init(&dw9714_dev->sd, client, &dw9714_ops); |
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dw9714_dev->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE | |
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V4L2_SUBDEV_FL_HAS_EVENTS; |
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dw9714_dev->sd.internal_ops = &dw9714_int_ops; |
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rval = dw9714_init_controls(dw9714_dev); |
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if (rval) |
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goto err_cleanup; |
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rval = media_entity_pads_init(&dw9714_dev->sd.entity, 0, NULL); |
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if (rval < 0) |
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goto err_cleanup; |
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dw9714_dev->sd.entity.function = MEDIA_ENT_F_LENS; |
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rval = v4l2_async_register_subdev(&dw9714_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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regulator_disable(dw9714_dev->vcc); |
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v4l2_ctrl_handler_free(&dw9714_dev->ctrls_vcm); |
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media_entity_cleanup(&dw9714_dev->sd.entity); |
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return rval; |
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} |
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static void dw9714_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 dw9714_device *dw9714_dev = sd_to_dw9714_vcm(sd); |
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int ret; |
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pm_runtime_disable(&client->dev); |
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if (!pm_runtime_status_suspended(&client->dev)) { |
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ret = regulator_disable(dw9714_dev->vcc); |
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if (ret) { |
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dev_err(&client->dev, |
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"Failed to disable vcc: %d\n", ret); |
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} |
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} |
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pm_runtime_set_suspended(&client->dev); |
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dw9714_subdev_cleanup(dw9714_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 DW9714_CTRL_STEPS, |
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* to make the movements smoothly. |
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*/ |
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static int __maybe_unused dw9714_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 dw9714_device *dw9714_dev = sd_to_dw9714_vcm(sd); |
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int ret, val; |
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if (pm_runtime_suspended(&client->dev)) |
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return 0; |
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for (val = dw9714_dev->current_val & ~(DW9714_CTRL_STEPS - 1); |
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val >= 0; val -= DW9714_CTRL_STEPS) { |
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ret = dw9714_i2c_write(client, |
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DW9714_VAL(val, DW9714_DEFAULT_S)); |
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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(DW9714_CTRL_DELAY_US, DW9714_CTRL_DELAY_US + 10); |
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} |
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ret = regulator_disable(dw9714_dev->vcc); |
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if (ret) |
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dev_err(dev, "Failed to disable vcc: %d\n", ret); |
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return ret; |
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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 DW9714_CTRL_STEPS, |
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* to make the movements smoothly. |
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*/ |
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static int __maybe_unused dw9714_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 dw9714_device *dw9714_dev = sd_to_dw9714_vcm(sd); |
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int ret, val; |
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if (pm_runtime_suspended(&client->dev)) |
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return 0; |
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ret = regulator_enable(dw9714_dev->vcc); |
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if (ret) { |
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dev_err(dev, "Failed to enable vcc: %d\n", ret); |
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return ret; |
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} |
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usleep_range(1000, 2000); |
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for (val = dw9714_dev->current_val % DW9714_CTRL_STEPS; |
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val < dw9714_dev->current_val + DW9714_CTRL_STEPS - 1; |
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val += DW9714_CTRL_STEPS) { |
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ret = dw9714_i2c_write(client, |
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DW9714_VAL(val, DW9714_DEFAULT_S)); |
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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(DW9714_CTRL_DELAY_US, DW9714_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 i2c_device_id dw9714_id_table[] = { |
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{ DW9714_NAME, 0 }, |
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{ { 0 } } |
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}; |
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MODULE_DEVICE_TABLE(i2c, dw9714_id_table); |
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static const struct of_device_id dw9714_of_table[] = { |
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{ .compatible = "dongwoon,dw9714" }, |
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{ { 0 } } |
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}; |
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MODULE_DEVICE_TABLE(of, dw9714_of_table); |
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static const struct dev_pm_ops dw9714_pm_ops = { |
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SET_SYSTEM_SLEEP_PM_OPS(dw9714_vcm_suspend, dw9714_vcm_resume) |
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SET_RUNTIME_PM_OPS(dw9714_vcm_suspend, dw9714_vcm_resume, NULL) |
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}; |
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static struct i2c_driver dw9714_i2c_driver = { |
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.driver = { |
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.name = DW9714_NAME, |
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.pm = &dw9714_pm_ops, |
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.of_match_table = dw9714_of_table, |
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}, |
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.probe_new = dw9714_probe, |
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.remove = dw9714_remove, |
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.id_table = dw9714_id_table, |
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}; |
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module_i2c_driver(dw9714_i2c_driver); |
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MODULE_AUTHOR("Tianshu Qiu <[email protected]>"); |
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MODULE_AUTHOR("Jian Xu Zheng"); |
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MODULE_AUTHOR("Yuning Pu <[email protected]>"); |
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MODULE_AUTHOR("Jouni Ukkonen <[email protected]>"); |
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MODULE_AUTHOR("Tommi Franttila <[email protected]>"); |
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MODULE_DESCRIPTION("DW9714 VCM driver"); |
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MODULE_LICENSE("GPL v2");
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