summaryrefslogtreecommitdiffstats
path: root/drivers/media/i2c/dw9714.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/media/i2c/dw9714.c')
-rw-r--r--drivers/media/i2c/dw9714.c315
1 files changed, 315 insertions, 0 deletions
diff --git a/drivers/media/i2c/dw9714.c b/drivers/media/i2c/dw9714.c
new file mode 100644
index 000000000..af5968738
--- /dev/null
+++ b/drivers/media/i2c/dw9714.c
@@ -0,0 +1,315 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2015--2017 Intel Corporation.
+
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-event.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 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;
+ }
+
+ 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, 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");
+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");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-20 05:22:24 +0000