| /* |
| * Copyright (c) 2015--2017 Intel Corporation. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License version |
| * 2 as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| |
| #include <linux/delay.h> |
| #include <linux/i2c.h> |
| #include <linux/module.h> |
| #include <linux/pm_runtime.h> |
| #include <media/v4l2-ctrls.h> |
| #include <media/v4l2-device.h> |
| |
| #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 i2c_client *client; |
| struct v4l2_ctrl_handler ctrls_vcm; |
| struct v4l2_subdev sd; |
| u16 current_val; |
| }; |
| |
| 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; |
| u16 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 = dw9714_dev->client; |
| |
| 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) |
| { |
| struct dw9714_device *dw9714_dev = sd_to_dw9714_vcm(sd); |
| struct device *dev = &dw9714_dev->client->dev; |
| int rval; |
| |
| rval = pm_runtime_get_sync(dev); |
| if (rval < 0) { |
| pm_runtime_put_noidle(dev); |
| return rval; |
| } |
| |
| return 0; |
| } |
| |
| static int dw9714_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh) |
| { |
| struct dw9714_device *dw9714_dev = sd_to_dw9714_vcm(sd); |
| struct device *dev = &dw9714_dev->client->dev; |
| |
| pm_runtime_put(dev); |
| |
| return 0; |
| } |
| |
| static const struct v4l2_subdev_internal_ops dw9714_int_ops = { |
| .open = dw9714_open, |
| .close = dw9714_close, |
| }; |
| |
| static const struct v4l2_subdev_ops dw9714_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; |
| struct i2c_client *client = dev_vcm->client; |
| |
| 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(&client->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->client = client; |
| |
| v4l2_i2c_subdev_init(&dw9714_dev->sd, client, &dw9714_ops); |
| dw9714_dev->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE; |
| 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); |
| |
| return 0; |
| |
| err_cleanup: |
| dw9714_subdev_cleanup(dw9714_dev); |
| dev_err(&client->dev, "Probe failed: %d\n", rval); |
| return rval; |
| } |
| |
| static int dw9714_remove(struct i2c_client *client) |
| { |
| struct v4l2_subdev *sd = i2c_get_clientdata(client); |
| struct dw9714_device *dw9714_dev = sd_to_dw9714_vcm(sd); |
| |
| pm_runtime_disable(&client->dev); |
| dw9714_subdev_cleanup(dw9714_dev); |
| |
| return 0; |
| } |
| |
| /* |
| * 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; |
| |
| 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); |
| } |
| 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 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; |
| |
| 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, 0 }, |
| { { 0 } } |
| }; |
| 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_new = dw9714_probe, |
| .remove = dw9714_remove, |
| .id_table = dw9714_id_table, |
| }; |
| |
| module_i2c_driver(dw9714_i2c_driver); |
| |
| MODULE_AUTHOR("Tianshu Qiu <tian.shu.qiu@intel.com>"); |
| MODULE_AUTHOR("Jian Xu Zheng <jian.xu.zheng@intel.com>"); |
| MODULE_AUTHOR("Yuning Pu <yuning.pu@intel.com>"); |
| MODULE_AUTHOR("Jouni Ukkonen <jouni.ukkonen@intel.com>"); |
| MODULE_AUTHOR("Tommi Franttila <tommi.franttila@intel.com>"); |
| MODULE_DESCRIPTION("DW9714 VCM driver"); |
| MODULE_LICENSE("GPL v2"); |