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329 lines
8.1 KiB
329 lines
8.1 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/iopoll.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 DW9807_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 DW9807_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 DW9807_CTRL_STEPS 16 |
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#define DW9807_CTRL_DELAY_US 1000 |
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#define DW9807_CTL_ADDR 0x02 |
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/* |
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* DW9807 separates two registers to control the VCM position. |
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* One for MSB value, another is LSB value. |
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*/ |
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#define DW9807_MSB_ADDR 0x03 |
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#define DW9807_LSB_ADDR 0x04 |
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#define DW9807_STATUS_ADDR 0x05 |
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#define DW9807_MODE_ADDR 0x06 |
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#define DW9807_RESONANCE_ADDR 0x07 |
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#define MAX_RETRY 10 |
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struct dw9807_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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}; |
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static inline struct dw9807_device *sd_to_dw9807_vcm( |
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struct v4l2_subdev *subdev) |
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{ |
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return container_of(subdev, struct dw9807_device, sd); |
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} |
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static int dw9807_i2c_check(struct i2c_client *client) |
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{ |
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const char status_addr = DW9807_STATUS_ADDR; |
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char status_result; |
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int ret; |
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ret = i2c_master_send(client, &status_addr, sizeof(status_addr)); |
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if (ret < 0) { |
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dev_err(&client->dev, "I2C write STATUS address fail ret = %d\n", |
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ret); |
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return ret; |
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} |
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ret = i2c_master_recv(client, &status_result, sizeof(status_result)); |
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if (ret < 0) { |
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dev_err(&client->dev, "I2C read STATUS value fail ret = %d\n", |
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ret); |
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return ret; |
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} |
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return status_result; |
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} |
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static int dw9807_set_dac(struct i2c_client *client, u16 data) |
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{ |
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const char tx_data[3] = { |
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DW9807_MSB_ADDR, ((data >> 8) & 0x03), (data & 0xff) |
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}; |
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int val, ret; |
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/* |
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* According to the datasheet, need to check the bus status before we |
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* write VCM position. This ensure that we really write the value |
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* into the register |
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*/ |
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ret = readx_poll_timeout(dw9807_i2c_check, client, val, val <= 0, |
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DW9807_CTRL_DELAY_US, MAX_RETRY * DW9807_CTRL_DELAY_US); |
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if (ret || val < 0) { |
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if (ret) { |
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dev_warn(&client->dev, |
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"Cannot do the write operation because VCM is busy\n"); |
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} |
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return ret ? -EBUSY : val; |
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} |
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/* Write VCM position to registers */ |
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ret = i2c_master_send(client, tx_data, sizeof(tx_data)); |
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if (ret < 0) { |
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dev_err(&client->dev, |
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"I2C write MSB fail ret=%d\n", ret); |
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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 dw9807_set_ctrl(struct v4l2_ctrl *ctrl) |
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{ |
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struct dw9807_device *dev_vcm = container_of(ctrl->handler, |
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struct dw9807_device, ctrls_vcm); |
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if (ctrl->id == V4L2_CID_FOCUS_ABSOLUTE) { |
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struct i2c_client *client = v4l2_get_subdevdata(&dev_vcm->sd); |
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dev_vcm->current_val = ctrl->val; |
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return dw9807_set_dac(client, ctrl->val); |
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} |
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return -EINVAL; |
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} |
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static const struct v4l2_ctrl_ops dw9807_vcm_ctrl_ops = { |
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.s_ctrl = dw9807_set_ctrl, |
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}; |
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static int dw9807_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh) |
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{ |
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int rval; |
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rval = pm_runtime_get_sync(sd->dev); |
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if (rval < 0) { |
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pm_runtime_put_noidle(sd->dev); |
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return rval; |
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} |
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return 0; |
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} |
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static int dw9807_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 dw9807_int_ops = { |
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.open = dw9807_open, |
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.close = dw9807_close, |
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}; |
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static const struct v4l2_subdev_ops dw9807_ops = { }; |
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static void dw9807_subdev_cleanup(struct dw9807_device *dw9807_dev) |
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{ |
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v4l2_async_unregister_subdev(&dw9807_dev->sd); |
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v4l2_ctrl_handler_free(&dw9807_dev->ctrls_vcm); |
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media_entity_cleanup(&dw9807_dev->sd.entity); |
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} |
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static int dw9807_init_controls(struct dw9807_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 = &dw9807_vcm_ctrl_ops; |
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struct i2c_client *client = v4l2_get_subdevdata(&dev_vcm->sd); |
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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, DW9807_MAX_FOCUS_POS, DW9807_FOCUS_STEPS, 0); |
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dev_vcm->sd.ctrl_handler = hdl; |
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if (hdl->error) { |
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dev_err(&client->dev, "%s fail error: 0x%x\n", |
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__func__, hdl->error); |
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return hdl->error; |
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} |
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return 0; |
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} |
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static int dw9807_probe(struct i2c_client *client) |
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{ |
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struct dw9807_device *dw9807_dev; |
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int rval; |
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dw9807_dev = devm_kzalloc(&client->dev, sizeof(*dw9807_dev), |
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GFP_KERNEL); |
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if (dw9807_dev == NULL) |
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return -ENOMEM; |
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v4l2_i2c_subdev_init(&dw9807_dev->sd, client, &dw9807_ops); |
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dw9807_dev->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE; |
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dw9807_dev->sd.internal_ops = &dw9807_int_ops; |
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rval = dw9807_init_controls(dw9807_dev); |
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if (rval) |
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goto err_cleanup; |
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rval = media_entity_pads_init(&dw9807_dev->sd.entity, 0, NULL); |
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if (rval < 0) |
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goto err_cleanup; |
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dw9807_dev->sd.entity.function = MEDIA_ENT_F_LENS; |
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rval = v4l2_async_register_subdev(&dw9807_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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v4l2_ctrl_handler_free(&dw9807_dev->ctrls_vcm); |
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media_entity_cleanup(&dw9807_dev->sd.entity); |
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return rval; |
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} |
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static int dw9807_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 dw9807_device *dw9807_dev = sd_to_dw9807_vcm(sd); |
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pm_runtime_disable(&client->dev); |
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dw9807_subdev_cleanup(dw9807_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 DW9807_CTRL_STEPS, |
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* to make the movements smoothly. |
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*/ |
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static int __maybe_unused dw9807_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 dw9807_device *dw9807_dev = sd_to_dw9807_vcm(sd); |
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const char tx_data[2] = { DW9807_CTL_ADDR, 0x01 }; |
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int ret, val; |
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for (val = dw9807_dev->current_val & ~(DW9807_CTRL_STEPS - 1); |
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val >= 0; val -= DW9807_CTRL_STEPS) { |
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ret = dw9807_set_dac(client, val); |
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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(DW9807_CTRL_DELAY_US, DW9807_CTRL_DELAY_US + 10); |
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} |
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/* Power down */ |
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ret = i2c_master_send(client, tx_data, sizeof(tx_data)); |
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if (ret < 0) { |
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dev_err(&client->dev, "I2C write CTL fail ret = %d\n", ret); |
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return ret; |
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} |
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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 DW9807_CTRL_STEPS, |
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* to make the movements smoothly. |
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*/ |
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static int __maybe_unused dw9807_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 dw9807_device *dw9807_dev = sd_to_dw9807_vcm(sd); |
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const char tx_data[2] = { DW9807_CTL_ADDR, 0x00 }; |
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int ret, val; |
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/* Power on */ |
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ret = i2c_master_send(client, tx_data, sizeof(tx_data)); |
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if (ret < 0) { |
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dev_err(&client->dev, "I2C write CTL fail ret = %d\n", ret); |
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return ret; |
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} |
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for (val = dw9807_dev->current_val % DW9807_CTRL_STEPS; |
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val < dw9807_dev->current_val + DW9807_CTRL_STEPS - 1; |
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val += DW9807_CTRL_STEPS) { |
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ret = dw9807_set_dac(client, val); |
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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(DW9807_CTRL_DELAY_US, DW9807_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 of_device_id dw9807_of_table[] = { |
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{ .compatible = "dongwoon,dw9807-vcm" }, |
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{ /* sentinel */ } |
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}; |
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MODULE_DEVICE_TABLE(of, dw9807_of_table); |
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static const struct dev_pm_ops dw9807_pm_ops = { |
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SET_SYSTEM_SLEEP_PM_OPS(dw9807_vcm_suspend, dw9807_vcm_resume) |
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SET_RUNTIME_PM_OPS(dw9807_vcm_suspend, dw9807_vcm_resume, NULL) |
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}; |
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static struct i2c_driver dw9807_i2c_driver = { |
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.driver = { |
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.name = "dw9807", |
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.pm = &dw9807_pm_ops, |
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.of_match_table = dw9807_of_table, |
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}, |
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.probe_new = dw9807_probe, |
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.remove = dw9807_remove, |
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}; |
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module_i2c_driver(dw9807_i2c_driver); |
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MODULE_AUTHOR("Chiang, Alan"); |
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MODULE_DESCRIPTION("DW9807 VCM driver"); |
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MODULE_LICENSE("GPL v2");
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