[media] ad5820: Add driver for auto-focus coil
This adds support for AD5820 autofocus coil, found for example in Nokia N900 smartphone. Signed-off-by: Pavel Machek <pavel@ucw.cz> Acked-by: Pali Rohár <pali.rohar@gmail.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:
Pavel Machek
Mauro Carvalho Chehab
parent
9887c8642d
commit
bee3d51156
@ -295,6 +295,13 @@ config VIDEO_ML86V7667
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To compile this driver as a module, choose M here: the
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module will be called ml86v7667.
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config VIDEO_AD5820
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tristate "AD5820 lens voice coil support"
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depends on I2C && VIDEO_V4L2 && MEDIA_CONTROLLER
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---help---
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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_SAA7110
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tristate "Philips SAA7110 video decoder"
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depends on VIDEO_V4L2 && I2C
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@ -19,6 +19,7 @@ obj-$(CONFIG_VIDEO_SAA717X) += saa717x.o
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obj-$(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_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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380
drivers/media/i2c/ad5820.c
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380
drivers/media/i2c/ad5820.c
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@ -0,0 +1,380 @@
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/*
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* drivers/media/i2c/ad5820.c
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*
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* AD5820 DAC driver for camera voice coil focus.
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*
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* Copyright (C) 2008 Nokia Corporation
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* Copyright (C) 2007 Texas Instruments
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* Copyright (C) 2016 Pavel Machek <pavel@ucw.cz>
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*
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* Contact: Tuukka Toivonen <tuukkat76@gmail.com>
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* Sakari Ailus <sakari.ailus@iki.fi>
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*
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* Based on af_d88.c by Texas Instruments.
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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
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* version 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, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#include <linux/errno.h>
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#include <linux/i2c.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/regulator/consumer.h>
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#include <media/v4l2-ctrls.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-subdev.h>
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#define AD5820_NAME "ad5820"
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/* Register definitions */
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#define AD5820_POWER_DOWN (1 << 15)
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#define AD5820_DAC_SHIFT 4
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#define AD5820_RAMP_MODE_LINEAR (0 << 3)
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#define AD5820_RAMP_MODE_64_16 (1 << 3)
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#define CODE_TO_RAMP_US(s) ((s) == 0 ? 0 : (1 << ((s) - 1)) * 50)
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#define RAMP_US_TO_CODE(c) fls(((c) + ((c)>>1)) / 50)
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#define to_ad5820_device(sd) container_of(sd, struct ad5820_device, subdev)
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struct ad5820_device {
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struct v4l2_subdev subdev;
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struct ad5820_platform_data *platform_data;
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struct regulator *vana;
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struct v4l2_ctrl_handler ctrls;
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u32 focus_absolute;
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u32 focus_ramp_time;
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u32 focus_ramp_mode;
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struct mutex power_lock;
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int power_count;
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int standby : 1;
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};
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static int ad5820_write(struct ad5820_device *coil, u16 data)
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{
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struct i2c_client *client = v4l2_get_subdevdata(&coil->subdev);
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struct i2c_msg msg;
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int r;
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if (!client->adapter)
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return -ENODEV;
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data = cpu_to_be16(data);
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msg.addr = client->addr;
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msg.flags = 0;
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msg.len = 2;
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msg.buf = (u8 *)&data;
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r = i2c_transfer(client->adapter, &msg, 1);
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if (r < 0) {
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dev_err(&client->dev, "write failed, error %d\n", r);
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return r;
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}
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return 0;
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}
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/*
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* Calculate status word and write it to the device based on current
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* values of V4L2 controls. It is assumed that the stored V4L2 control
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* values are properly limited and rounded.
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*/
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static int ad5820_update_hw(struct ad5820_device *coil)
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{
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u16 status;
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status = RAMP_US_TO_CODE(coil->focus_ramp_time);
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status |= coil->focus_ramp_mode
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? AD5820_RAMP_MODE_64_16 : AD5820_RAMP_MODE_LINEAR;
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status |= coil->focus_absolute << AD5820_DAC_SHIFT;
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if (coil->standby)
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status |= AD5820_POWER_DOWN;
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return ad5820_write(coil, status);
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}
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/*
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* Power handling
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*/
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static int ad5820_power_off(struct ad5820_device *coil, int standby)
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{
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int ret = 0, ret2;
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/*
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* Go to standby first as real power off my be denied by the hardware
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* (single power line control for both coil and sensor).
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*/
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if (standby) {
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coil->standby = 1;
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ret = ad5820_update_hw(coil);
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}
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ret2 = regulator_disable(coil->vana);
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if (ret)
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return ret;
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return ret2;
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}
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static int ad5820_power_on(struct ad5820_device *coil, int restore)
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{
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int ret;
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ret = regulator_enable(coil->vana);
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if (ret < 0)
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return ret;
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if (restore) {
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/* Restore the hardware settings. */
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coil->standby = 0;
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ret = ad5820_update_hw(coil);
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if (ret)
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goto fail;
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}
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return 0;
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fail:
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coil->standby = 1;
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regulator_disable(coil->vana);
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return ret;
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}
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/*
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* V4L2 controls
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*/
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static int ad5820_set_ctrl(struct v4l2_ctrl *ctrl)
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{
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struct ad5820_device *coil =
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container_of(ctrl->handler, struct ad5820_device, ctrls);
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switch (ctrl->id) {
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case V4L2_CID_FOCUS_ABSOLUTE:
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coil->focus_absolute = ctrl->val;
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return ad5820_update_hw(coil);
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}
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return 0;
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}
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static const struct v4l2_ctrl_ops ad5820_ctrl_ops = {
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.s_ctrl = ad5820_set_ctrl,
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};
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static int ad5820_init_controls(struct ad5820_device *coil)
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{
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v4l2_ctrl_handler_init(&coil->ctrls, 1);
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/*
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* V4L2_CID_FOCUS_ABSOLUTE
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*
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* Minimum current is 0 mA, maximum is 100 mA. Thus, 1 code is
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* equivalent to 100/1023 = 0.0978 mA. Nevertheless, we do not use [mA]
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* for focus position, because it is meaningless for user. Meaningful
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* would be to use focus distance or even its inverse, but since the
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* driver doesn't have sufficiently knowledge to do the conversion, we
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* will just use abstract codes here. In any case, smaller value = focus
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* position farther from camera. The default zero value means focus at
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* infinity, and also least current consumption.
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*/
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v4l2_ctrl_new_std(&coil->ctrls, &ad5820_ctrl_ops,
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V4L2_CID_FOCUS_ABSOLUTE, 0, 1023, 1, 0);
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if (coil->ctrls.error)
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return coil->ctrls.error;
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coil->focus_absolute = 0;
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coil->focus_ramp_time = 0;
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coil->focus_ramp_mode = 0;
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coil->subdev.ctrl_handler = &coil->ctrls;
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return 0;
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}
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/*
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* V4L2 subdev operations
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*/
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static int ad5820_registered(struct v4l2_subdev *subdev)
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{
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struct ad5820_device *coil = to_ad5820_device(subdev);
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return ad5820_init_controls(coil);
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}
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static int
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ad5820_set_power(struct v4l2_subdev *subdev, int on)
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{
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struct ad5820_device *coil = to_ad5820_device(subdev);
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int ret = 0;
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mutex_lock(&coil->power_lock);
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/*
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* If the power count is modified from 0 to != 0 or from != 0 to 0,
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* update the power state.
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*/
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if (coil->power_count == !on) {
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ret = on ? ad5820_power_on(coil, 1) : ad5820_power_off(coil, 1);
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if (ret < 0)
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goto done;
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}
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/* Update the power count. */
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coil->power_count += on ? 1 : -1;
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WARN_ON(coil->power_count < 0);
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done:
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mutex_unlock(&coil->power_lock);
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return ret;
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}
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static int ad5820_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
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{
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return ad5820_set_power(sd, 1);
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}
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static int ad5820_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
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{
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return ad5820_set_power(sd, 0);
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}
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static const struct v4l2_subdev_core_ops ad5820_core_ops = {
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.s_power = ad5820_set_power,
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};
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static const struct v4l2_subdev_ops ad5820_ops = {
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.core = &ad5820_core_ops,
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};
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static const struct v4l2_subdev_internal_ops ad5820_internal_ops = {
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.registered = ad5820_registered,
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.open = ad5820_open,
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.close = ad5820_close,
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};
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/*
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* I2C driver
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*/
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#ifdef CONFIG_PM
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static int ad5820_suspend(struct device *dev)
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{
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struct i2c_client *client = container_of(dev, struct i2c_client, dev);
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struct v4l2_subdev *subdev = i2c_get_clientdata(client);
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struct ad5820_device *coil = to_ad5820_device(subdev);
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if (!coil->power_count)
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return 0;
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return ad5820_power_off(coil, 0);
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}
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static int ad5820_resume(struct device *dev)
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{
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struct i2c_client *client = container_of(dev, struct i2c_client, dev);
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struct v4l2_subdev *subdev = i2c_get_clientdata(client);
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struct ad5820_device *coil = to_ad5820_device(subdev);
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if (!coil->power_count)
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return 0;
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return ad5820_power_on(coil, 1);
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}
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#else
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#define ad5820_suspend NULL
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#define ad5820_resume NULL
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#endif /* CONFIG_PM */
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static int ad5820_probe(struct i2c_client *client,
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const struct i2c_device_id *devid)
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{
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struct ad5820_device *coil;
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int ret;
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coil = devm_kzalloc(&client->dev, sizeof(*coil), GFP_KERNEL);
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if (!coil)
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return -ENOMEM;
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coil->vana = devm_regulator_get(&client->dev, "VANA");
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if (IS_ERR(coil->vana)) {
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ret = PTR_ERR(coil->vana);
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if (ret != -EPROBE_DEFER)
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dev_err(&client->dev, "could not get regulator for vana\n");
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return ret;
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}
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mutex_init(&coil->power_lock);
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v4l2_i2c_subdev_init(&coil->subdev, client, &ad5820_ops);
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coil->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
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coil->subdev.internal_ops = &ad5820_internal_ops;
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strcpy(coil->subdev.name, "ad5820 focus");
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ret = media_entity_pads_init(&coil->subdev.entity, 0, NULL);
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if (ret < 0)
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goto cleanup2;
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ret = v4l2_async_register_subdev(&coil->subdev);
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if (ret < 0)
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goto cleanup;
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return ret;
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cleanup2:
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mutex_destroy(&coil->power_lock);
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cleanup:
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media_entity_cleanup(&coil->subdev.entity);
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return ret;
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}
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static int __exit ad5820_remove(struct i2c_client *client)
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{
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struct v4l2_subdev *subdev = i2c_get_clientdata(client);
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struct ad5820_device *coil = to_ad5820_device(subdev);
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v4l2_device_unregister_subdev(&coil->subdev);
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v4l2_ctrl_handler_free(&coil->ctrls);
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media_entity_cleanup(&coil->subdev.entity);
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mutex_destroy(&coil->power_lock);
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return 0;
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}
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static const struct i2c_device_id ad5820_id_table[] = {
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{ AD5820_NAME, 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, ad5820_id_table);
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static SIMPLE_DEV_PM_OPS(ad5820_pm, ad5820_suspend, ad5820_resume);
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static struct i2c_driver ad5820_i2c_driver = {
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.driver = {
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.name = AD5820_NAME,
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.pm = &ad5820_pm,
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},
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.probe = ad5820_probe,
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.remove = __exit_p(ad5820_remove),
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.id_table = ad5820_id_table,
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};
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module_i2c_driver(ad5820_i2c_driver);
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MODULE_AUTHOR("Tuukka Toivonen");
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MODULE_DESCRIPTION("AD5820 camera lens driver");
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MODULE_LICENSE("GPL");
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