From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- drivers/media/i2c/ak7375.c | 317 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 317 insertions(+) create mode 100644 drivers/media/i2c/ak7375.c (limited to 'drivers/media/i2c/ak7375.c') diff --git a/drivers/media/i2c/ak7375.c b/drivers/media/i2c/ak7375.c new file mode 100644 index 0000000000..463b51d463 --- /dev/null +++ b/drivers/media/i2c/ak7375.c @@ -0,0 +1,317 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2018 Intel Corporation + +#include +#include +#include +#include +#include +#include +#include +#include + +#define AK7375_MAX_FOCUS_POS 4095 +/* + * This sets the minimum granularity for the focus positions. + * A value of 1 gives maximum accuracy for a desired focus position + */ +#define AK7375_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 AK7375_CTRL_STEPS 64 +#define AK7375_CTRL_DELAY_US 1000 +/* + * The vcm may take up 10 ms (tDELAY) to power on and start taking + * I2C messages. Based on AK7371 datasheet. + */ +#define AK7375_POWER_DELAY_US 10000 + +#define AK7375_REG_POSITION 0x0 +#define AK7375_REG_CONT 0x2 +#define AK7375_MODE_ACTIVE 0x0 +#define AK7375_MODE_STANDBY 0x40 + +static const char * const ak7375_supply_names[] = { + "vdd", + "vio", +}; + +/* ak7375 device structure */ +struct ak7375_device { + struct v4l2_ctrl_handler ctrls_vcm; + struct v4l2_subdev sd; + struct v4l2_ctrl *focus; + struct regulator_bulk_data supplies[ARRAY_SIZE(ak7375_supply_names)]; + + /* active or standby mode */ + bool active; +}; + +static inline struct ak7375_device *to_ak7375_vcm(struct v4l2_ctrl *ctrl) +{ + return container_of(ctrl->handler, struct ak7375_device, ctrls_vcm); +} + +static inline struct ak7375_device *sd_to_ak7375_vcm(struct v4l2_subdev *subdev) +{ + return container_of(subdev, struct ak7375_device, sd); +} + +static int ak7375_i2c_write(struct ak7375_device *ak7375, + u8 addr, u16 data, u8 size) +{ + struct i2c_client *client = v4l2_get_subdevdata(&ak7375->sd); + u8 buf[3]; + int ret; + + if (size != 1 && size != 2) + return -EINVAL; + buf[0] = addr; + buf[size] = data & 0xff; + if (size == 2) + buf[1] = (data >> 8) & 0xff; + ret = i2c_master_send(client, (const char *)buf, size + 1); + if (ret < 0) + return ret; + if (ret != size + 1) + return -EIO; + + return 0; +} + +static int ak7375_set_ctrl(struct v4l2_ctrl *ctrl) +{ + struct ak7375_device *dev_vcm = to_ak7375_vcm(ctrl); + + if (ctrl->id == V4L2_CID_FOCUS_ABSOLUTE) + return ak7375_i2c_write(dev_vcm, AK7375_REG_POSITION, + ctrl->val << 4, 2); + + return -EINVAL; +} + +static const struct v4l2_ctrl_ops ak7375_vcm_ctrl_ops = { + .s_ctrl = ak7375_set_ctrl, +}; + +static int ak7375_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh) +{ + return pm_runtime_resume_and_get(sd->dev); +} + +static int ak7375_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh) +{ + pm_runtime_put(sd->dev); + + return 0; +} + +static const struct v4l2_subdev_internal_ops ak7375_int_ops = { + .open = ak7375_open, + .close = ak7375_close, +}; + +static const struct v4l2_subdev_ops ak7375_ops = { }; + +static void ak7375_subdev_cleanup(struct ak7375_device *ak7375_dev) +{ + v4l2_async_unregister_subdev(&ak7375_dev->sd); + v4l2_ctrl_handler_free(&ak7375_dev->ctrls_vcm); + media_entity_cleanup(&ak7375_dev->sd.entity); +} + +static int ak7375_init_controls(struct ak7375_device *dev_vcm) +{ + struct v4l2_ctrl_handler *hdl = &dev_vcm->ctrls_vcm; + const struct v4l2_ctrl_ops *ops = &ak7375_vcm_ctrl_ops; + + v4l2_ctrl_handler_init(hdl, 1); + + dev_vcm->focus = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FOCUS_ABSOLUTE, + 0, AK7375_MAX_FOCUS_POS, AK7375_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 ak7375_probe(struct i2c_client *client) +{ + struct ak7375_device *ak7375_dev; + int ret; + unsigned int i; + + ak7375_dev = devm_kzalloc(&client->dev, sizeof(*ak7375_dev), + GFP_KERNEL); + if (!ak7375_dev) + return -ENOMEM; + + for (i = 0; i < ARRAY_SIZE(ak7375_supply_names); i++) + ak7375_dev->supplies[i].supply = ak7375_supply_names[i]; + + ret = devm_regulator_bulk_get(&client->dev, + ARRAY_SIZE(ak7375_supply_names), + ak7375_dev->supplies); + if (ret) { + dev_err_probe(&client->dev, ret, "Failed to get regulators\n"); + return ret; + } + + v4l2_i2c_subdev_init(&ak7375_dev->sd, client, &ak7375_ops); + ak7375_dev->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE; + ak7375_dev->sd.internal_ops = &ak7375_int_ops; + ak7375_dev->sd.entity.function = MEDIA_ENT_F_LENS; + + ret = ak7375_init_controls(ak7375_dev); + if (ret) + goto err_cleanup; + + ret = media_entity_pads_init(&ak7375_dev->sd.entity, 0, NULL); + if (ret < 0) + goto err_cleanup; + + ret = v4l2_async_register_subdev(&ak7375_dev->sd); + if (ret < 0) + goto err_cleanup; + + pm_runtime_set_active(&client->dev); + pm_runtime_enable(&client->dev); + pm_runtime_idle(&client->dev); + + return 0; + +err_cleanup: + v4l2_ctrl_handler_free(&ak7375_dev->ctrls_vcm); + media_entity_cleanup(&ak7375_dev->sd.entity); + + return ret; +} + +static void ak7375_remove(struct i2c_client *client) +{ + struct v4l2_subdev *sd = i2c_get_clientdata(client); + struct ak7375_device *ak7375_dev = sd_to_ak7375_vcm(sd); + + ak7375_subdev_cleanup(ak7375_dev); + pm_runtime_disable(&client->dev); + pm_runtime_set_suspended(&client->dev); +} + +/* + * This function sets the vcm position, so it consumes least current + * The lens position is gradually moved in units of AK7375_CTRL_STEPS, + * to make the movements smoothly. + */ +static int __maybe_unused ak7375_vcm_suspend(struct device *dev) +{ + struct v4l2_subdev *sd = dev_get_drvdata(dev); + struct ak7375_device *ak7375_dev = sd_to_ak7375_vcm(sd); + int ret, val; + + if (!ak7375_dev->active) + return 0; + + for (val = ak7375_dev->focus->val & ~(AK7375_CTRL_STEPS - 1); + val >= 0; val -= AK7375_CTRL_STEPS) { + ret = ak7375_i2c_write(ak7375_dev, AK7375_REG_POSITION, + val << 4, 2); + if (ret) + dev_err_once(dev, "%s I2C failure: %d\n", + __func__, ret); + usleep_range(AK7375_CTRL_DELAY_US, AK7375_CTRL_DELAY_US + 10); + } + + ret = ak7375_i2c_write(ak7375_dev, AK7375_REG_CONT, + AK7375_MODE_STANDBY, 1); + if (ret) + dev_err(dev, "%s I2C failure: %d\n", __func__, ret); + + ret = regulator_bulk_disable(ARRAY_SIZE(ak7375_supply_names), + ak7375_dev->supplies); + if (ret) + return ret; + + ak7375_dev->active = false; + + 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 AK7375_CTRL_STEPS, + * to make the movements smoothly. + */ +static int __maybe_unused ak7375_vcm_resume(struct device *dev) +{ + struct v4l2_subdev *sd = dev_get_drvdata(dev); + struct ak7375_device *ak7375_dev = sd_to_ak7375_vcm(sd); + int ret, val; + + if (ak7375_dev->active) + return 0; + + ret = regulator_bulk_enable(ARRAY_SIZE(ak7375_supply_names), + ak7375_dev->supplies); + if (ret) + return ret; + + /* Wait for vcm to become ready */ + usleep_range(AK7375_POWER_DELAY_US, AK7375_POWER_DELAY_US + 500); + + ret = ak7375_i2c_write(ak7375_dev, AK7375_REG_CONT, + AK7375_MODE_ACTIVE, 1); + if (ret) { + dev_err(dev, "%s I2C failure: %d\n", __func__, ret); + return ret; + } + + for (val = ak7375_dev->focus->val % AK7375_CTRL_STEPS; + val <= ak7375_dev->focus->val; + val += AK7375_CTRL_STEPS) { + ret = ak7375_i2c_write(ak7375_dev, AK7375_REG_POSITION, + val << 4, 2); + if (ret) + dev_err_ratelimited(dev, "%s I2C failure: %d\n", + __func__, ret); + usleep_range(AK7375_CTRL_DELAY_US, AK7375_CTRL_DELAY_US + 10); + } + + ak7375_dev->active = true; + + return 0; +} + +static const struct of_device_id ak7375_of_table[] = { + { .compatible = "asahi-kasei,ak7375" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, ak7375_of_table); + +static const struct dev_pm_ops ak7375_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(ak7375_vcm_suspend, ak7375_vcm_resume) + SET_RUNTIME_PM_OPS(ak7375_vcm_suspend, ak7375_vcm_resume, NULL) +}; + +static struct i2c_driver ak7375_i2c_driver = { + .driver = { + .name = "ak7375", + .pm = &ak7375_pm_ops, + .of_match_table = ak7375_of_table, + }, + .probe = ak7375_probe, + .remove = ak7375_remove, +}; +module_i2c_driver(ak7375_i2c_driver); + +MODULE_AUTHOR("Tianshu Qiu "); +MODULE_AUTHOR("Bingbu Cao "); +MODULE_DESCRIPTION("AK7375 VCM driver"); +MODULE_LICENSE("GPL v2"); -- cgit v1.2.3