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SubjectRe: [PATCHv2] support for AD5820 camera auto-focus coil
From
Date
Hi,

On 21.05.2016 08:43, Pavel Machek wrote:
> This adds support for AD5820 autofocus coil, found for example in
> Nokia N900 smartphone.
>
> Signed-off-by: Pavel Machek <pavel@ucw.cz>
>
> ---
> v2: simple cleanups, fix error paths, simplify probe
>
> I think it is ready. Please apply :-).
>
> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
> index 993dc50..77313a1 100644
> --- a/drivers/media/i2c/Kconfig
> +++ b/drivers/media/i2c/Kconfig
> @@ -279,6 +279,13 @@ config VIDEO_ML86V7667
> To compile this driver as a module, choose M here: the
> module will be called ml86v7667.
>
> +config VIDEO_AD5820
> + tristate "AD5820 lens voice coil support"
> + depends on I2C && VIDEO_V4L2 && MEDIA_CONTROLLER
> + ---help---
> + This is a driver for the AD5820 camera lens voice coil.
> + It is used for example in Nokia N900 (RX-51).
> +
> config VIDEO_SAA7110
> tristate "Philips SAA7110 video decoder"
> depends on VIDEO_V4L2 && I2C
> diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
> index 94f2c99..34434ae 100644
> --- a/drivers/media/i2c/Makefile
> +++ b/drivers/media/i2c/Makefile
> @@ -19,6 +20,7 @@ obj-$(CONFIG_VIDEO_SAA717X) += saa717x.o
> obj-$(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_ADV7170) += adv7170.o
> obj-$(CONFIG_VIDEO_ADV7175) += adv7175.o
> obj-$(CONFIG_VIDEO_ADV7180) += adv7180.o
> diff --git a/drivers/media/i2c/ad5820.c b/drivers/media/i2c/ad5820.c
> new file mode 100644
> index 0000000..7725829
> --- /dev/null
> +++ b/drivers/media/i2c/ad5820.c
> @@ -0,0 +1,416 @@
> +/*
> + * drivers/media/i2c/ad5820.c
> + *
> + * AD5820 DAC driver for camera voice coil focus.
> + *
> + * Copyright (C) 2008 Nokia Corporation
> + * Copyright (C) 2007 Texas Instruments
> + * Copyright (C) 2016 Pavel Machek <pavel@ucw.cz>
> + *
> + * Contact: Tuukka Toivonen
> + * Sakari Ailus
> + *
> + * Based on af_d88.c by Texas Instruments.
> + *
> + * 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.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
> + * 02110-1301 USA
> + */
> +

Remove FSF address from the above.

> +#include <linux/module.h>
> +#include <linux/errno.h>
> +#include <linux/i2c.h>
> +#include <linux/slab.h>
> +#include <linux/sched.h>
> +#include <linux/delay.h>
> +#include <linux/bitops.h>
> +#include <linux/kernel.h>
> +#include <linux/regulator/consumer.h>
> +
> +#include <media/ad5820.h>

drivers/media/i2c/ad5820.c:40:26: fatal error: media/ad5820.h: No such
file or directory

> +#include <media/v4l2-device.h>
> +
> +#define CODE_TO_RAMP_US(s) ((s) == 0 ? 0 : (1 << ((s) - 1)) * 50)
> +#define RAMP_US_TO_CODE(c) fls(((c) + ((c)>>1)) / 50)
> +
> +/**
> + * @brief I2C write using i2c_transfer().
> + * @param coil - the driver data structure
> + * @param data - register value to be written
> + * @returns nonnegative on success, negative if failed
> + */
> +static int ad5820_write(struct ad5820_device *coil, u16 data)
> +{
> + struct i2c_client *client = v4l2_get_subdevdata(&coil->subdev);
> + struct i2c_msg msg;
> + int r;
> +
> + if (!client->adapter)
> + return -ENODEV;
> +
> + data = cpu_to_be16(data);
> + msg.addr = client->addr;
> + msg.flags = 0;
> + msg.len = 2;
> + msg.buf = (u8 *)&data;
> +
> + r = i2c_transfer(client->adapter, &msg, 1);
> + if (r < 0) {
> + dev_err(&client->dev, "write failed, error %d\n", r);
> + return r;
> + }
> +
> + return 0;
> +}
> +
> +/*
> + * Calculate status word and write it to the device based on current
> + * values of V4L2 controls. It is assumed that the stored V4L2 control
> + * values are properly limited and rounded.
> + */
> +static int ad5820_update_hw(struct ad5820_device *coil)
> +{
> + u16 status;
> +
> + status = RAMP_US_TO_CODE(coil->focus_ramp_time);
> + status |= coil->focus_ramp_mode
> + ? AD5820_RAMP_MODE_64_16 : AD5820_RAMP_MODE_LINEAR;
> + status |= coil->focus_absolute << AD5820_DAC_SHIFT;
> +
> + if (coil->standby)
> + status |= AD5820_POWER_DOWN;
> +
> + return ad5820_write(coil, status);
> +}
> +
> +/*
> + * Power handling
> + */
> +static int ad5820_power_off(struct ad5820_device *coil, int standby)
> +{
> + int ret = 0;
> +
> + /*
> + * Go to standby first as real power off my be denied by the hardware
> + * (single power line control for both coil and sensor).
> + */
> + if (standby) {
> + coil->standby = 1;
> + ret = ad5820_update_hw(coil);
> + }
> +
> + ret |= regulator_disable(coil->vana);
> +
> + return ret;
> +}
> +
> +static int ad5820_power_on(struct ad5820_device *coil, int restore)
> +{
> + int ret;
> +
> + printk("ad5820_power_on: 1\n");

Some remnants from testing?

> + ret = regulator_enable(coil->vana);
> + if (ret < 0)
> + return ret;
> +
> + if (restore) {
> + /* Restore the hardware settings. */
> + coil->standby = 0;
> + ret = ad5820_update_hw(coil);
> + if (ret)
> + goto fail;
> + }
> + return 0;
> +
> +fail:
> + coil->standby = 1;
> + regulator_disable(coil->vana);
> +
> + return ret;
> +}
> +
> +/*
> + * V4L2 controls
> + */
> +static int ad5820_set_ctrl(struct v4l2_ctrl *ctrl)
> +{
> + struct ad5820_device *coil =
> + container_of(ctrl->handler, struct ad5820_device, ctrls);
> + u32 code;
> +
> + switch (ctrl->id) {
> + case V4L2_CID_FOCUS_ABSOLUTE:
> + coil->focus_absolute = ctrl->val;
> + return ad5820_update_hw(coil);
> +
> + case V4L2_CID_FOCUS_AD5820_RAMP_TIME:
> + code = RAMP_US_TO_CODE(ctrl->val);
> + ctrl->val = CODE_TO_RAMP_US(code);
> + coil->focus_ramp_time = ctrl->val;
> + break;
> +
> + case V4L2_CID_FOCUS_AD5820_RAMP_MODE:
> + coil->focus_ramp_mode = ctrl->val;
> + break;
> + }
> +
> + return 0;
> +}
> +
> +static const struct v4l2_ctrl_ops ad5820_ctrl_ops = {
> + .s_ctrl = ad5820_set_ctrl,
> +};
> +
> +static const char *ad5820_focus_menu[] = {

static const char * const ?

> + "Linear ramp",
> + "64/16 ramp",
> +};
> +
> +static const struct v4l2_ctrl_config ad5820_ctrls[] = {
> + {
> + .ops = &ad5820_ctrl_ops,
> + .id = V4L2_CID_FOCUS_AD5820_RAMP_TIME,
> + .type = V4L2_CTRL_TYPE_INTEGER,
> + .name = "Focus ramping time [us]",
> + .min = 0,
> + .max = 3200,
> + .step = 50,
> + .def = 0,
> + .flags = 0,
> + },
> + {
> + .ops = &ad5820_ctrl_ops,
> + .id = V4L2_CID_FOCUS_AD5820_RAMP_MODE,
> + .type = V4L2_CTRL_TYPE_MENU,
> + .name = "Focus ramping mode",
> + .min = 0,
> + .max = ARRAY_SIZE(ad5820_focus_menu),
> + .step = 0,
> + .def = 0,
> + .flags = 0,
> + .qmenu = ad5820_focus_menu,
> + },
> +};
> +
> +
> +static int ad5820_init_controls(struct ad5820_device *coil)
> +{
> + unsigned int i;
> +
> + v4l2_ctrl_handler_init(&coil->ctrls, ARRAY_SIZE(ad5820_ctrls) + 1);
> +
> + /*
> + * V4L2_CID_FOCUS_ABSOLUTE
> + *
> + * Minimum current is 0 mA, maximum is 100 mA. Thus, 1 code is
> + * equivalent to 100/1023 = 0.0978 mA. Nevertheless, we do not use [mA]
> + * for focus position, because it is meaningless for user. Meaningful
> + * would be to use focus distance or even its inverse, but since the
> + * driver doesn't have sufficiently knowledge to do the conversion, we
> + * will just use abstract codes here. In any case, smaller value = focus
> + * position farther from camera. The default zero value means focus at
> + * infinity, and also least current consumption.
> + */
> + v4l2_ctrl_new_std(&coil->ctrls, &ad5820_ctrl_ops,
> + V4L2_CID_FOCUS_ABSOLUTE, 0, 1023, 1, 0);
> +
> + /* V4L2_CID_TEST_PATTERN and V4L2_CID_MODE_* */
> + for (i = 0; i < ARRAY_SIZE(ad5820_ctrls); ++i)
> + v4l2_ctrl_new_custom(&coil->ctrls, &ad5820_ctrls[i], NULL);
> +
> + if (coil->ctrls.error)
> + return coil->ctrls.error;
> +
> + coil->focus_absolute = 0;
> + coil->focus_ramp_time = 0;
> + coil->focus_ramp_mode = 0;
> +
> + coil->subdev.ctrl_handler = &coil->ctrls;
> + return 0;
> +}

please add a new line before return.

> +
> +/*
> + * V4L2 subdev operations
> + */
> +static int ad5820_registered(struct v4l2_subdev *subdev)
> +{
> + struct ad5820_device *coil = to_ad5820_device(subdev);
> + struct i2c_client *client = v4l2_get_subdevdata(subdev);
> +
> + coil->vana = regulator_get(&client->dev, "VANA");
> + if (IS_ERR(coil->vana)) {
> + dev_err(&client->dev, "could not get regulator for vana\n");
> + return -ENODEV;
> + }
> +
> + return ad5820_init_controls(coil);
> +}
> +
> +static int
> +ad5820_set_power(struct v4l2_subdev *subdev, int on)
> +{
> + struct ad5820_device *coil = to_ad5820_device(subdev);
> + int ret = 0;
> +
> + mutex_lock(&coil->power_lock);
> +
> + /*
> + * If the power count is modified from 0 to != 0 or from != 0 to 0,
> + * update the power state.
> + */
> + if (coil->power_count == !on) {
> + ret = on ? ad5820_power_on(coil, 1) : ad5820_power_off(coil, 1);
> + if (ret < 0)
> + goto done;
> + }
> +
> + /* Update the power count. */
> + coil->power_count += on ? 1 : -1;
> + WARN_ON(coil->power_count < 0);
> +
> +done:
> + mutex_unlock(&coil->power_lock);
> + return ret;
> +}
> +
> +static int ad5820_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
> +{
> + return ad5820_set_power(sd, 1);
> +}
> +
> +static int ad5820_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
> +{
> + return ad5820_set_power(sd, 0);
> +}
> +
> +static const struct v4l2_subdev_core_ops ad5820_core_ops = {
> + .s_power = ad5820_set_power,
> +};
> +
> +static const struct v4l2_subdev_ops ad5820_ops = {
> + .core = &ad5820_core_ops,
> +};
> +
> +static const struct v4l2_subdev_internal_ops ad5820_internal_ops = {
> + .registered = ad5820_registered,
> + .open = ad5820_open,
> + .close = ad5820_close,
> +};
> +
> +/*
> + * I2C driver
> + */
> +#ifdef CONFIG_PM
> +
> +static int ad5820_suspend(struct device *dev)
> +{
> + struct i2c_client *client = container_of(dev, struct i2c_client, dev);
> + struct v4l2_subdev *subdev = i2c_get_clientdata(client);
> + struct ad5820_device *coil = to_ad5820_device(subdev);
> +
> + if (!coil->power_count)
> + return 0;
> +
> + return ad5820_power_off(coil, 0);
> +}
> +
> +static int ad5820_resume(struct device *dev)
> +{
> + struct i2c_client *client = container_of(dev, struct i2c_client, dev);
> + struct v4l2_subdev *subdev = i2c_get_clientdata(client);
> + struct ad5820_device *coil = to_ad5820_device(subdev);
> +
> + if (!coil->power_count)
> + return 0;
> +
> + return ad5820_power_on(coil, 1);
> +}
> +
> +#else
> +
> +#define ad5820_suspend NULL
> +#define ad5820_resume NULL
> +
> +#endif /* CONFIG_PM */
> +
> +static int ad5820_probe(struct i2c_client *client,
> + const struct i2c_device_id *devid)
> +{
> + struct ad5820_device *coil;
> + int ret = 0;
> +
> + coil = kzalloc(sizeof(*coil), GFP_KERNEL);
> + if (coil == NULL)

if (!coil) ?

> + return -ENOMEM;
> +
> + mutex_init(&coil->power_lock);
> +
> + v4l2_i2c_subdev_init(&coil->subdev, client, &ad5820_ops);
> + coil->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> + coil->subdev.internal_ops = &ad5820_internal_ops;
> + strcpy(coil->subdev.name, "ad5820 focus");
> +
> + ret = media_entity_pads_init(&coil->subdev.entity, 0, NULL);
> + if (ret < 0)
> + goto free;
> +
> + ret = v4l2_async_register_subdev(&coil->subdev);
> + if (ret < 0)
> + goto cleanup;
> +
> + return ret;
> +cleanup:
> + media_entity_cleanup(&coil->subdev.entity);
> +free:
> + kfree(coil);
> + return ret;
> +}

new line before return, also I would put new lines before labels :)

> +
> +static int __exit ad5820_remove(struct i2c_client *client)
> +{
> + struct v4l2_subdev *subdev = i2c_get_clientdata(client);
> + struct ad5820_device *coil = to_ad5820_device(subdev);
> +
> + v4l2_device_unregister_subdev(&coil->subdev);
> + v4l2_ctrl_handler_free(&coil->ctrls);
> + media_entity_cleanup(&coil->subdev.entity);
> + if (coil->vana)
> + regulator_put(coil->vana);
> +
> + kfree(coil);

new line here

> + return 0;
> +}
> +
> +static const struct i2c_device_id ad5820_id_table[] = {
> + { AD5820_NAME, 0 },
> + { }
> +};
> +MODULE_DEVICE_TABLE(i2c, ad5820_id_table);
> +
> +static SIMPLE_DEV_PM_OPS(ad5820_pm, ad5820_suspend, ad5820_resume);
> +
> +static struct i2c_driver ad5820_i2c_driver = {
> + .driver = {
> + .name = AD5820_NAME,
> + .pm = &ad5820_pm,
> + },
> + .probe = ad5820_probe,
> + .remove = __exit_p(ad5820_remove),
> + .id_table = ad5820_id_table,
> +};
> +
> +module_i2c_driver(ad5820_i2c_driver);
> +
> +MODULE_AUTHOR("Tuukka Toivonen");
> +MODULE_DESCRIPTION("AD5820 camera lens driver");
> +MODULE_LICENSE("GPL");
>

Thanks,
Ivo

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