// SPDX-License-Identifier: GPL-2.0 // Copyright (c) 2015--2017 Intel Corporation. #include #include #include #include #include #include #include #include #define DW9714_NAME "dw9714" #define DW9714_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 DW9714_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 DW9714_CTRL_STEPS 16 #define DW9714_CTRL_DELAY_US 1000 /* * S[3:2] = 0x00, codes per step for "Linear Slope Control" * S[1:0] = 0x00, step period */ #define DW9714_DEFAULT_S 0x0 #define DW9714_VAL(data, s) ((data) << 4 | (s)) /* dw9714 device structure */ struct dw9714_device { struct v4l2_ctrl_handler ctrls_vcm; struct v4l2_subdev sd; u16 current_val; struct regulator *vcc; }; static inline struct dw9714_device *to_dw9714_vcm(struct v4l2_ctrl *ctrl) { return container_of(ctrl->handler, struct dw9714_device, ctrls_vcm); } static inline struct dw9714_device *sd_to_dw9714_vcm(struct v4l2_subdev *subdev) { return container_of(subdev, struct dw9714_device, sd); } static int dw9714_i2c_write(struct i2c_client *client, u16 data) { int ret; __be16 val = cpu_to_be16(data); ret = i2c_master_send(client, (const char *)&val, sizeof(val)); if (ret != sizeof(val)) { dev_err(&client->dev, "I2C write fail\n"); return -EIO; } return 0; } static int dw9714_t_focus_vcm(struct dw9714_device *dw9714_dev, u16 val) { struct i2c_client *client = v4l2_get_subdevdata(&dw9714_dev->sd); dw9714_dev->current_val = val; return dw9714_i2c_write(client, DW9714_VAL(val, DW9714_DEFAULT_S)); } static int dw9714_set_ctrl(struct v4l2_ctrl *ctrl) { struct dw9714_device *dev_vcm = to_dw9714_vcm(ctrl); if (ctrl->id == V4L2_CID_FOCUS_ABSOLUTE) return dw9714_t_focus_vcm(dev_vcm, ctrl->val); return -EINVAL; } static const struct v4l2_ctrl_ops dw9714_vcm_ctrl_ops = { .s_ctrl = dw9714_set_ctrl, }; static int dw9714_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh) { return pm_runtime_resume_and_get(sd->dev); } static int dw9714_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh) { pm_runtime_put(sd->dev); return 0; } static const struct v4l2_subdev_internal_ops dw9714_int_ops = { .open = dw9714_open, .close = dw9714_close, }; static const struct v4l2_subdev_core_ops dw9714_core_ops = { .log_status = v4l2_ctrl_subdev_log_status, .subscribe_event = v4l2_ctrl_subdev_subscribe_event, .unsubscribe_event = v4l2_event_subdev_unsubscribe, }; static const struct v4l2_subdev_ops dw9714_ops = { .core = &dw9714_core_ops, }; static void dw9714_subdev_cleanup(struct dw9714_device *dw9714_dev) { v4l2_async_unregister_subdev(&dw9714_dev->sd); v4l2_ctrl_handler_free(&dw9714_dev->ctrls_vcm); media_entity_cleanup(&dw9714_dev->sd.entity); } static int dw9714_init_controls(struct dw9714_device *dev_vcm) { struct v4l2_ctrl_handler *hdl = &dev_vcm->ctrls_vcm; const struct v4l2_ctrl_ops *ops = &dw9714_vcm_ctrl_ops; v4l2_ctrl_handler_init(hdl, 1); v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FOCUS_ABSOLUTE, 0, DW9714_MAX_FOCUS_POS, DW9714_FOCUS_STEPS, 0); if (hdl->error) dev_err(dev_vcm->sd.dev, "%s fail error: 0x%x\n", __func__, hdl->error); dev_vcm->sd.ctrl_handler = hdl; return hdl->error; } static int dw9714_probe(struct i2c_client *client) { struct dw9714_device *dw9714_dev; int rval; dw9714_dev = devm_kzalloc(&client->dev, sizeof(*dw9714_dev), GFP_KERNEL); if (dw9714_dev == NULL) return -ENOMEM; dw9714_dev->vcc = devm_regulator_get(&client->dev, "vcc"); if (IS_ERR(dw9714_dev->vcc)) return PTR_ERR(dw9714_dev->vcc); rval = regulator_enable(dw9714_dev->vcc); if (rval < 0) { dev_err(&client->dev, "failed to enable vcc: %d\n", rval); return rval; } usleep_range(1000, 2000); v4l2_i2c_subdev_init(&dw9714_dev->sd, client, &dw9714_ops); dw9714_dev->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_HAS_EVENTS; dw9714_dev->sd.internal_ops = &dw9714_int_ops; rval = dw9714_init_controls(dw9714_dev); if (rval) goto err_cleanup; rval = media_entity_pads_init(&dw9714_dev->sd.entity, 0, NULL); if (rval < 0) goto err_cleanup; dw9714_dev->sd.entity.function = MEDIA_ENT_F_LENS; rval = v4l2_async_register_subdev(&dw9714_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: regulator_disable(dw9714_dev->vcc); v4l2_ctrl_handler_free(&dw9714_dev->ctrls_vcm); media_entity_cleanup(&dw9714_dev->sd.entity); return rval; } static void dw9714_remove(struct i2c_client *client) { struct v4l2_subdev *sd = i2c_get_clientdata(client); struct dw9714_device *dw9714_dev = sd_to_dw9714_vcm(sd); int ret; pm_runtime_disable(&client->dev); if (!pm_runtime_status_suspended(&client->dev)) { ret = regulator_disable(dw9714_dev->vcc); if (ret) { dev_err(&client->dev, "Failed to disable vcc: %d\n", ret); } } pm_runtime_set_suspended(&client->dev); dw9714_subdev_cleanup(dw9714_dev); } /* * This function sets the vcm position, so it consumes least current * The lens position is gradually moved in units of DW9714_CTRL_STEPS, * to make the movements smoothly. */ static int __maybe_unused dw9714_vcm_suspend(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct v4l2_subdev *sd = i2c_get_clientdata(client); struct dw9714_device *dw9714_dev = sd_to_dw9714_vcm(sd); int ret, val; if (pm_runtime_suspended(&client->dev)) return 0; for (val = dw9714_dev->current_val & ~(DW9714_CTRL_STEPS - 1); val >= 0; val -= DW9714_CTRL_STEPS) { ret = dw9714_i2c_write(client, DW9714_VAL(val, DW9714_DEFAULT_S)); if (ret) dev_err_once(dev, "%s I2C failure: %d", __func__, ret); usleep_range(DW9714_CTRL_DELAY_US, DW9714_CTRL_DELAY_US + 10); } ret = regulator_disable(dw9714_dev->vcc); if (ret) dev_err(dev, "Failed to disable vcc: %d\n", ret); return ret; } /* * 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 DW9714_CTRL_STEPS, * to make the movements smoothly. */ static int __maybe_unused dw9714_vcm_resume(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct v4l2_subdev *sd = i2c_get_clientdata(client); struct dw9714_device *dw9714_dev = sd_to_dw9714_vcm(sd); int ret, val; if (pm_runtime_suspended(&client->dev)) return 0; ret = regulator_enable(dw9714_dev->vcc); if (ret) { dev_err(dev, "Failed to enable vcc: %d\n", ret); return ret; } usleep_range(1000, 2000); for (val = dw9714_dev->current_val % DW9714_CTRL_STEPS; val < dw9714_dev->current_val + DW9714_CTRL_STEPS - 1; val += DW9714_CTRL_STEPS) { ret = dw9714_i2c_write(client, DW9714_VAL(val, DW9714_DEFAULT_S)); if (ret) dev_err_ratelimited(dev, "%s I2C failure: %d", __func__, ret); usleep_range(DW9714_CTRL_DELAY_US, DW9714_CTRL_DELAY_US + 10); } return 0; } static const struct i2c_device_id dw9714_id_table[] = { { DW9714_NAME }, { } }; MODULE_DEVICE_TABLE(i2c, dw9714_id_table); static const struct of_device_id dw9714_of_table[] = { { .compatible = "dongwoon,dw9714" }, { { 0 } } }; MODULE_DEVICE_TABLE(of, dw9714_of_table); static const struct dev_pm_ops dw9714_pm_ops = { SET_SYSTEM_SLEEP_PM_OPS(dw9714_vcm_suspend, dw9714_vcm_resume) SET_RUNTIME_PM_OPS(dw9714_vcm_suspend, dw9714_vcm_resume, NULL) }; static struct i2c_driver dw9714_i2c_driver = { .driver = { .name = DW9714_NAME, .pm = &dw9714_pm_ops, .of_match_table = dw9714_of_table, }, .probe = dw9714_probe, .remove = dw9714_remove, .id_table = dw9714_id_table, }; module_i2c_driver(dw9714_i2c_driver); MODULE_AUTHOR("Tianshu Qiu "); MODULE_AUTHOR("Jian Xu Zheng"); MODULE_AUTHOR("Yuning Pu"); MODULE_AUTHOR("Jouni Ukkonen"); MODULE_AUTHOR("Tommi Franttila"); MODULE_DESCRIPTION("DW9714 VCM driver"); MODULE_LICENSE("GPL v2");