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[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>
This commit is contained in:
Rajmohan Mani
Mauro Carvalho Chehab
parent
5fcf092e0c
commit
cc95d3423c
@ -4693,6 +4693,13 @@ S: Maintained
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F: drivers/media/usb/dvb-usb-v2/dvb_usb*
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F: drivers/media/usb/dvb-usb-v2/usb_urb.c
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DONGWOON DW9714 LENS VOICE COIL DRIVER
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M: Sakari Ailus <sakari.ailus@linux.intel.com>
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L: linux-media@vger.kernel.org
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T: git git://linuxtv.org/media_tree.git
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S: Maintained
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F: drivers/media/i2c/dw9714.c
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DYNAMIC DEBUG
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M: Jason Baron <jbaron@akamai.com>
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S: Maintained
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@ -303,6 +303,16 @@ config VIDEO_AD5820
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This is a driver for the AD5820 camera lens voice coil.
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It is used for example in Nokia N900 (RX-51).
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config VIDEO_DW9714
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tristate "DW9714 lens voice coil support"
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depends on I2C && VIDEO_V4L2 && MEDIA_CONTROLLER
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depends on VIDEO_V4L2_SUBDEV_API
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---help---
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This is a driver for the DW9714 camera lens voice coil.
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DW9714 is a 10 bit DAC with 120mA output current sink
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capability. This is designed for linear control of
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voice coil motors, controlled via I2C serial interface.
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config VIDEO_SAA7110
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tristate "Philips SAA7110 video decoder"
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depends on VIDEO_V4L2 && I2C
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@ -21,6 +21,7 @@ obj-$(CONFIG_VIDEO_SAA7127) += saa7127.o
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obj-$(CONFIG_VIDEO_SAA7185) += saa7185.o
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obj-$(CONFIG_VIDEO_SAA6752HS) += saa6752hs.o
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obj-$(CONFIG_VIDEO_AD5820) += ad5820.o
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obj-$(CONFIG_VIDEO_DW9714) += dw9714.o
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obj-$(CONFIG_VIDEO_ADV7170) += adv7170.o
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obj-$(CONFIG_VIDEO_ADV7175) += adv7175.o
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obj-$(CONFIG_VIDEO_ADV7180) += adv7180.o
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291
drivers/media/i2c/dw9714.c
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291
drivers/media/i2c/dw9714.c
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@ -0,0 +1,291 @@
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/*
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* Copyright (c) 2015--2017 Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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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/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 DW9714_NAME "dw9714"
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#define DW9714_MAX_FOCUS_POS 1023
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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 DW9714_CTRL_STEPS 16
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#define DW9714_CTRL_DELAY_US 1000
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/*
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* S[3:2] = 0x00, codes per step for "Linear Slope Control"
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* S[1:0] = 0x00, step period
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*/
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#define DW9714_DEFAULT_S 0x0
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#define DW9714_VAL(data, s) ((data) << 4 | (s))
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/* dw9714 device structure */
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struct dw9714_device {
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struct i2c_client *client;
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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 dw9714_device *to_dw9714_vcm(struct v4l2_ctrl *ctrl)
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{
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return container_of(ctrl->handler, struct dw9714_device, ctrls_vcm);
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}
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static inline struct dw9714_device *sd_to_dw9714_vcm(struct v4l2_subdev *subdev)
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{
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return container_of(subdev, struct dw9714_device, sd);
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}
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static int dw9714_i2c_write(struct i2c_client *client, u16 data)
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{
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int ret;
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u16 val = cpu_to_be16(data);
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ret = i2c_master_send(client, (const char *)&val, sizeof(val));
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if (ret != sizeof(val)) {
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dev_err(&client->dev, "I2C write fail\n");
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return -EIO;
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}
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return 0;
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}
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static int dw9714_t_focus_vcm(struct dw9714_device *dw9714_dev, u16 val)
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{
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struct i2c_client *client = dw9714_dev->client;
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dw9714_dev->current_val = val;
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return dw9714_i2c_write(client, DW9714_VAL(val, DW9714_DEFAULT_S));
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}
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static int dw9714_set_ctrl(struct v4l2_ctrl *ctrl)
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{
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struct dw9714_device *dev_vcm = to_dw9714_vcm(ctrl);
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if (ctrl->id == V4L2_CID_FOCUS_ABSOLUTE)
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return dw9714_t_focus_vcm(dev_vcm, ctrl->val);
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return -EINVAL;
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}
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static const struct v4l2_ctrl_ops dw9714_vcm_ctrl_ops = {
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.s_ctrl = dw9714_set_ctrl,
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};
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static int dw9714_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
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{
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struct dw9714_device *dw9714_dev = sd_to_dw9714_vcm(sd);
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struct device *dev = &dw9714_dev->client->dev;
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int rval;
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rval = pm_runtime_get_sync(dev);
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if (rval < 0) {
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pm_runtime_put_noidle(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 dw9714_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
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{
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struct dw9714_device *dw9714_dev = sd_to_dw9714_vcm(sd);
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struct device *dev = &dw9714_dev->client->dev;
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pm_runtime_put(dev);
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return 0;
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}
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static const struct v4l2_subdev_internal_ops dw9714_int_ops = {
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.open = dw9714_open,
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.close = dw9714_close,
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};
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static const struct v4l2_subdev_ops dw9714_ops = { };
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static void dw9714_subdev_cleanup(struct dw9714_device *dw9714_dev)
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{
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v4l2_async_unregister_subdev(&dw9714_dev->sd);
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v4l2_ctrl_handler_free(&dw9714_dev->ctrls_vcm);
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media_entity_cleanup(&dw9714_dev->sd.entity);
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}
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static int dw9714_init_controls(struct dw9714_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 = &dw9714_vcm_ctrl_ops;
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struct i2c_client *client = dev_vcm->client;
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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, DW9714_MAX_FOCUS_POS, DW9714_CTRL_STEPS, 0);
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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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dev_vcm->sd.ctrl_handler = hdl;
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return hdl->error;
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}
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static int dw9714_probe(struct i2c_client *client,
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const struct i2c_device_id *devid)
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{
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struct dw9714_device *dw9714_dev;
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int rval;
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dw9714_dev = devm_kzalloc(&client->dev, sizeof(*dw9714_dev),
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GFP_KERNEL);
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if (dw9714_dev == NULL)
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return -ENOMEM;
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dw9714_dev->client = client;
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v4l2_i2c_subdev_init(&dw9714_dev->sd, client, &dw9714_ops);
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dw9714_dev->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
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dw9714_dev->sd.internal_ops = &dw9714_int_ops;
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rval = dw9714_init_controls(dw9714_dev);
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if (rval)
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goto err_cleanup;
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rval = media_entity_pads_init(&dw9714_dev->sd.entity, 0, NULL);
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if (rval < 0)
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goto err_cleanup;
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dw9714_dev->sd.entity.function = MEDIA_ENT_F_LENS;
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rval = v4l2_async_register_subdev(&dw9714_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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return 0;
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err_cleanup:
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dw9714_subdev_cleanup(dw9714_dev);
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dev_err(&client->dev, "Probe failed: %d\n", rval);
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return rval;
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}
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static int dw9714_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 dw9714_device *dw9714_dev = sd_to_dw9714_vcm(sd);
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pm_runtime_disable(&client->dev);
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dw9714_subdev_cleanup(dw9714_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 DW9714_CTRL_STEPS,
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* to make the movements smoothly.
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*/
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static int __maybe_unused dw9714_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 dw9714_device *dw9714_dev = sd_to_dw9714_vcm(sd);
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int ret, val;
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for (val = dw9714_dev->current_val & ~(DW9714_CTRL_STEPS - 1);
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val >= 0; val -= DW9714_CTRL_STEPS) {
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ret = dw9714_i2c_write(client,
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DW9714_VAL(val, DW9714_DEFAULT_S));
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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(DW9714_CTRL_DELAY_US, DW9714_CTRL_DELAY_US + 10);
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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 DW9714_CTRL_STEPS,
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* to make the movements smoothly.
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*/
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static int __maybe_unused dw9714_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 dw9714_device *dw9714_dev = sd_to_dw9714_vcm(sd);
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int ret, val;
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for (val = dw9714_dev->current_val % DW9714_CTRL_STEPS;
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val < dw9714_dev->current_val + DW9714_CTRL_STEPS - 1;
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val += DW9714_CTRL_STEPS) {
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ret = dw9714_i2c_write(client,
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DW9714_VAL(val, DW9714_DEFAULT_S));
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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(DW9714_CTRL_DELAY_US, DW9714_CTRL_DELAY_US + 10);
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}
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return 0;
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}
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#ifdef CONFIG_ACPI
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static const struct acpi_device_id dw9714_acpi_match[] = {
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{},
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};
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MODULE_DEVICE_TABLE(acpi, dw9714_acpi_match);
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#endif
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static const struct i2c_device_id dw9714_id_table[] = {
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{DW9714_NAME, 0},
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{}
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};
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MODULE_DEVICE_TABLE(i2c, dw9714_id_table);
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static const struct dev_pm_ops dw9714_pm_ops = {
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SET_SYSTEM_SLEEP_PM_OPS(dw9714_vcm_suspend, dw9714_vcm_resume)
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SET_RUNTIME_PM_OPS(dw9714_vcm_suspend, dw9714_vcm_resume, NULL)
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};
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static struct i2c_driver dw9714_i2c_driver = {
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.driver = {
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.name = DW9714_NAME,
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.pm = &dw9714_pm_ops,
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.acpi_match_table = ACPI_PTR(dw9714_acpi_match),
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},
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.probe = dw9714_probe,
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.remove = dw9714_remove,
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.id_table = dw9714_id_table,
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};
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module_i2c_driver(dw9714_i2c_driver);
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MODULE_AUTHOR("Tianshu Qiu <tian.shu.qiu@intel.com>");
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MODULE_AUTHOR("Jian Xu Zheng <jian.xu.zheng@intel.com>");
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MODULE_AUTHOR("Yuning Pu <yuning.pu@intel.com>");
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MODULE_AUTHOR("Jouni Ukkonen <jouni.ukkonen@intel.com>");
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MODULE_AUTHOR("Tommi Franttila <tommi.franttila@intel.com>");
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MODULE_DESCRIPTION("DW9714 VCM driver");
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MODULE_LICENSE("GPL v2");
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