Commit cc95d342 authored by Rajmohan Mani's avatar Rajmohan Mani Committed by Mauro Carvalho Chehab

[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: default avatarRajmohan Mani <rajmohan.mani@intel.com>
Signed-off-by: default avatarSakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@s-opensource.com>
parent 5fcf092e
......@@ -4693,6 +4693,13 @@ S: Maintained
F: drivers/media/usb/dvb-usb-v2/dvb_usb*
F: drivers/media/usb/dvb-usb-v2/usb_urb.c
DONGWOON DW9714 LENS VOICE COIL DRIVER
M: Sakari Ailus <sakari.ailus@linux.intel.com>
L: linux-media@vger.kernel.org
T: git git://linuxtv.org/media_tree.git
S: Maintained
F: drivers/media/i2c/dw9714.c
DYNAMIC DEBUG
M: Jason Baron <jbaron@akamai.com>
S: Maintained
......
......@@ -303,6 +303,16 @@ config VIDEO_AD5820
This is a driver for the AD5820 camera lens voice coil.
It is used for example in Nokia N900 (RX-51).
config VIDEO_DW9714
tristate "DW9714 lens voice coil support"
depends on I2C && VIDEO_V4L2 && MEDIA_CONTROLLER
depends on VIDEO_V4L2_SUBDEV_API
---help---
This is a driver for the DW9714 camera lens voice coil.
DW9714 is a 10 bit DAC with 120mA output current sink
capability. This is designed for linear control of
voice coil motors, controlled via I2C serial interface.
config VIDEO_SAA7110
tristate "Philips SAA7110 video decoder"
depends on VIDEO_V4L2 && I2C
......
......@@ -21,6 +21,7 @@ obj-$(CONFIG_VIDEO_SAA7127) += saa7127.o
obj-$(CONFIG_VIDEO_SAA7185) += saa7185.o
obj-$(CONFIG_VIDEO_SAA6752HS) += saa6752hs.o
obj-$(CONFIG_VIDEO_AD5820) += ad5820.o
obj-$(CONFIG_VIDEO_DW9714) += dw9714.o
obj-$(CONFIG_VIDEO_ADV7170) += adv7170.o
obj-$(CONFIG_VIDEO_ADV7175) += adv7175.o
obj-$(CONFIG_VIDEO_ADV7180) += adv7180.o
......
/*
* 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");
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