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20ea6adbf1
Build system: x86_64 Build-tested: bcm2708, bcm2709, bcm2710, bcm2711 Run-tested: bcm2708/RPiB+, bcm2709/RPi3B, bcm2710/RPi3B, bcm2711/RPi4B Signed-off-by: Marty Jones <mj8263788@gmail.com> Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
389 lines
10 KiB
Diff
389 lines
10 KiB
Diff
From 838b1d352c8b7a8380fc2f00c42948e8307f51de Mon Sep 17 00:00:00 2001
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From: Dave Stevenson <dave.stevenson@raspberrypi.com>
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Date: Wed, 29 Sep 2021 14:04:28 +0100
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Subject: [PATCH] media: i2c: Add driver for AD5398 VCM lens driver
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Adds a driver for the Analog Devices AD5398 10 bit
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I2C DAC which is commonly used for driving VCM lens
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mechanisms.
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Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
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---
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drivers/media/i2c/Kconfig | 7 +
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drivers/media/i2c/Makefile | 1 +
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drivers/media/i2c/ad5398.c | 342 +++++++++++++++++++++++++++++++++++++
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3 files changed, 350 insertions(+)
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create mode 100644 drivers/media/i2c/ad5398.c
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--- a/drivers/media/i2c/Kconfig
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+++ b/drivers/media/i2c/Kconfig
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@@ -1451,6 +1451,13 @@ endmenu
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menu "Lens drivers"
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visible if MEDIA_CAMERA_SUPPORT
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+config VIDEO_AD5398
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+ tristate "AD5398 lens voice coil support"
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+ depends on GPIOLIB && I2C && VIDEO_V4L2
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+ select MEDIA_CONTROLLER
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+ help
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+ This is a driver for the AD5398 camera lens voice coil.
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+
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config VIDEO_AD5820
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tristate "AD5820 lens voice coil support"
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depends on GPIOLIB && I2C && VIDEO_V4L2
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--- a/drivers/media/i2c/Makefile
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+++ b/drivers/media/i2c/Makefile
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@@ -21,6 +21,7 @@ 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-$(CONFIG_VIDEO_AD5398) += ad5398.o
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obj-$(CONFIG_VIDEO_AD5820) += ad5820.o
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obj-$(CONFIG_VIDEO_AK7375) += ak7375.o
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obj-$(CONFIG_VIDEO_DW9714) += dw9714.o
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--- /dev/null
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+++ b/drivers/media/i2c/ad5398.c
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@@ -0,0 +1,342 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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+/*
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+ * AD5398 DAC driver for camera voice coil focus.
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+ * Copyright (C) 2021 Raspberry Pi (Trading) Ltd.
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+ *
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+ * Based on AD5820 DAC driver by Nokia and TI.
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+ *
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+ * This driver uses the regulator framework notification hooks on the
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+ * assumption that the VCM and sensor share a regulator. This means the VCM
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+ * position will be restored when either the sensor or VCM subdevices are opened
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+ * or powered up. The client can therefore choose to ignore the VCM subdevice,
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+ * and the lens position will be as previously requested. Without that, there
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+ * is a hard requirement to have the VCM subdevice open in order for the VCM
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+ * to be powered and at the requested position.
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+ */
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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 <linux/gpio/consumer.h>
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+
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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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+
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+/* Register definitions */
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+#define AD5398_POWER_DOWN BIT(15)
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+#define AD5398_DAC_SHIFT 4
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+
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+#define to_ad5398_device(sd) container_of(sd, struct ad5398_device, subdev)
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+
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+struct ad5398_device {
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+ struct v4l2_subdev subdev;
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+ struct ad5398_platform_data *platform_data;
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+ struct regulator *vana;
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+ struct notifier_block nb;
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+
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+ struct v4l2_ctrl_handler ctrls;
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+ u32 focus_absolute;
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+
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+ bool standby;
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+};
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+
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+static int ad5398_write(struct ad5398_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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+ __be16 be_data;
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+ int r;
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+
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+ if (!client->adapter)
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+ return -ENODEV;
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+
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+ be_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 *)&be_data;
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+
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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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+
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+ return 0;
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+}
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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 ad5398_update_hw(struct ad5398_device *coil)
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+{
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+ u16 status;
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+
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+ status = coil->focus_absolute << AD5398_DAC_SHIFT;
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+
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+ if (coil->standby)
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+ status |= AD5398_POWER_DOWN;
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+
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+ return ad5398_write(coil, status);
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+}
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+
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+/*
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+ * Power handling
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+ */
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+static int ad5398_power_off(struct ad5398_device *coil)
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+{
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+ int ret = 0;
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+
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+ coil->standby = true;
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+ ret = ad5398_update_hw(coil);
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+
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+ return ret;
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+}
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+
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+static int ad5398_power_on(struct ad5398_device *coil)
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+{
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+ int ret;
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+
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+ /* Restore the hardware settings. */
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+ coil->standby = false;
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+ ret = ad5398_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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+
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+fail:
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+ coil->standby = true;
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+
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+ return ret;
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+}
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+
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+/*
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+ * V4L2 controls
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+ */
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+static int ad5398_set_ctrl(struct v4l2_ctrl *ctrl)
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+{
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+ struct ad5398_device *coil =
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+ container_of(ctrl->handler, struct ad5398_device, ctrls);
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+
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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 ad5398_update_hw(coil);
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+ }
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+
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+ return 0;
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+}
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+
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+static const struct v4l2_ctrl_ops ad5398_ctrl_ops = {
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+ .s_ctrl = ad5398_set_ctrl,
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+};
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+
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+static int ad5398_init_controls(struct ad5398_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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+ /*
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+ * V4L2_CID_FOCUS_ABSOLUTE
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+ *
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+ * Minimum current is 0 mA, maximum is 120 mA. Thus, 1 code is
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+ * equivalent to 120/1023 = 0.1173 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 sufficient 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, &ad5398_ctrl_ops,
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+ V4L2_CID_FOCUS_ABSOLUTE, 0, 1023, 1, 0);
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+
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+ if (coil->ctrls.error)
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+ return coil->ctrls.error;
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+
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+ coil->focus_absolute = 0;
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+
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+ coil->subdev.ctrl_handler = &coil->ctrls;
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+
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+ return 0;
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+}
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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 ad5398_registered(struct v4l2_subdev *subdev)
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+{
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+ struct ad5398_device *coil = to_ad5398_device(subdev);
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+
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+ return ad5398_init_controls(coil);
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+}
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+
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+static int
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+ad5398_set_power(struct v4l2_subdev *subdev, int on)
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+{
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+ struct ad5398_device *coil = to_ad5398_device(subdev);
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+ int ret;
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+
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+ if (on)
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+ ret = regulator_enable(coil->vana);
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+ else
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+ ret = regulator_disable(coil->vana);
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+
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+ return ret;
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+}
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+
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+static int ad5398_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
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+{
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+ struct ad5398_device *coil = to_ad5398_device(sd);
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+
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+ return regulator_enable(coil->vana);
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+}
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+
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+static int ad5398_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
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+{
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+ struct ad5398_device *coil = to_ad5398_device(sd);
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+
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+ return regulator_disable(coil->vana);
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+}
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+
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+static const struct v4l2_subdev_core_ops ad5398_core_ops = {
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+ .s_power = ad5398_set_power,
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+};
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+
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+static const struct v4l2_subdev_ops ad5398_ops = {
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+ .core = &ad5398_core_ops,
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+};
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+
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+static const struct v4l2_subdev_internal_ops ad5398_internal_ops = {
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+ .registered = ad5398_registered,
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+ .open = ad5398_open,
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+ .close = ad5398_close,
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+};
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+
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+/*
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+ * I2C driver
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+ */
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+static int __maybe_unused ad5398_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 ad5398_device *coil = to_ad5398_device(subdev);
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+
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+ return regulator_enable(coil->vana);
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+}
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+
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+static int __maybe_unused ad5398_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 ad5398_device *coil = to_ad5398_device(subdev);
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+
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+ return regulator_disable(coil->vana);
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+}
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+
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+static int ad5398_regulator_notifier(struct notifier_block *nb,
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+ unsigned long event,
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+ void *ignored)
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+{
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+ struct ad5398_device *coil = container_of(nb, struct ad5398_device, nb);
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+
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+ if (event == REGULATOR_EVENT_ENABLE)
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+ ad5398_power_on(coil);
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+ else if (event == REGULATOR_EVENT_PRE_DISABLE)
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+ ad5398_power_off(coil);
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+
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+ return NOTIFY_OK;
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+}
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+
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+static int ad5398_probe(struct i2c_client *client,
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+ const struct i2c_device_id *devid)
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+{
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+ struct ad5398_device *coil;
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+ int ret;
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+
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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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+
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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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+
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+ v4l2_i2c_subdev_init(&coil->subdev, client, &ad5398_ops);
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+ coil->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
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+ coil->subdev.internal_ops = &ad5398_internal_ops;
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+ coil->subdev.entity.function = MEDIA_ENT_F_LENS;
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+ strscpy(coil->subdev.name, "ad5398 focus", sizeof(coil->subdev.name));
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+
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+ coil->nb.notifier_call = &ad5398_regulator_notifier;
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+ ret = regulator_register_notifier(coil->vana, &coil->nb);
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+ if (ret < 0)
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+ return ret;
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+
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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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+
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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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+
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+ return ret;
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+
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+cleanup:
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+ media_entity_cleanup(&coil->subdev.entity);
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+cleanup2:
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+ regulator_unregister_notifier(coil->vana, &coil->nb);
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+ return ret;
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+}
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+
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+static int ad5398_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 ad5398_device *coil = to_ad5398_device(subdev);
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+
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+ v4l2_async_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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+ return 0;
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+}
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+
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+static const struct i2c_device_id ad5398_id_table[] = {
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+ { "ad5398", 0 },
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+ { }
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+};
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+MODULE_DEVICE_TABLE(i2c, ad5398_id_table);
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+
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+static const struct of_device_id ad5398_of_table[] = {
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+ { .compatible = "adi,ad5398" },
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+ { }
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+};
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+MODULE_DEVICE_TABLE(of, ad5398_of_table);
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+
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+static SIMPLE_DEV_PM_OPS(ad5398_pm, ad5398_suspend, ad5398_resume);
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+
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+static struct i2c_driver ad5398_i2c_driver = {
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+ .driver = {
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+ .name = "ad5398",
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+ .pm = &ad5398_pm,
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+ .of_match_table = ad5398_of_table,
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+ },
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+ .probe = ad5398_probe,
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+ .remove = ad5398_remove,
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+ .id_table = ad5398_id_table,
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+};
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+
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+module_i2c_driver(ad5398_i2c_driver);
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+
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+MODULE_AUTHOR("Dave Stevenson <dave.stevenson@raspberrypi.com>");
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+MODULE_DESCRIPTION("AD5398 camera lens driver");
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+MODULE_LICENSE("GPL");
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