diff options
author | Rajmohan Mani <rajmohan.mani@intel.com> | 2017-06-03 10:11:40 +0200 |
---|---|---|
committer | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2017-06-20 13:17:48 +0200 |
commit | cc95d3423c6786d61e3c52898ed69955077f41a6 (patch) | |
tree | 66d6a754a82309d976d9885417dc5ecc76955b7f /drivers/media/i2c/dw9714.c | |
parent | [media] ov13858: add support for OV13858 sensor (diff) | |
download | linux-cc95d3423c6786d61e3c52898ed69955077f41a6.tar.xz linux-cc95d3423c6786d61e3c52898ed69955077f41a6.zip |
[media] dw9714: Initial driver for dw9714 VCM
DW9714 is a 10 bit DAC, designed for linear
control of voice coil motor.
This driver creates a V4L2 subdevice and
provides control to set the desired focus.
[Sakari Ailus: Add MAINTAINERS entry.]
Signed-off-by: Rajmohan Mani <rajmohan.mani@intel.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Diffstat (limited to 'drivers/media/i2c/dw9714.c')
-rw-r--r-- | drivers/media/i2c/dw9714.c | 291 |
1 files changed, 291 insertions, 0 deletions
diff --git a/drivers/media/i2c/dw9714.c b/drivers/media/i2c/dw9714.c new file mode 100644 index 000000000000..6a607d7f82de --- /dev/null +++ b/drivers/media/i2c/dw9714.c @@ -0,0 +1,291 @@ +/* + * 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/acpi.h> +#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 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_CTRL_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, + const struct i2c_device_id *devid) +{ + 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; +} + +#ifdef CONFIG_ACPI +static const struct acpi_device_id dw9714_acpi_match[] = { + {}, +}; +MODULE_DEVICE_TABLE(acpi, dw9714_acpi_match); +#endif + +static const struct i2c_device_id dw9714_id_table[] = { + {DW9714_NAME, 0}, + {} +}; + +MODULE_DEVICE_TABLE(i2c, dw9714_id_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, + .acpi_match_table = ACPI_PTR(dw9714_acpi_match), + }, + .probe = 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"); |