From: Alan Chiang <alanx.chiang@xxxxxxxxx>
DW9807 is a 10 bit DAC from Dongwoon, designed for linear
control of voice coil motor.
This driver creates a V4L2 subdevice and
provides control to set the desired focus.
Signed-off-by: Andy Yeh <andy.yeh@xxxxxxxxx>
---
since v1:
- changed author.
since v2:
- addressed outstanding comments.
- enabled sequential write to update 2 registers in a single transaction.
since v3:
- addressed comments for v3.
- Remove redundant codes and declare some variables as constant variable.
- separate DT binding to another patch
since v4:
- sent patchset included DT binding with cover page
since v6:
- change the return code of i2c_check
- fix long cols exceed 80 chars
- remove #define DW9807_NAME since only used once
MAINTAINERS | 7 +
drivers/media/i2c/Kconfig | 10 ++
drivers/media/i2c/Makefile | 1 +
drivers/media/i2c/dw9807.c | 335 +++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 353 insertions(+)
create mode 100644 drivers/media/i2c/dw9807.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 845fc25..a339bb5 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4385,6 +4385,13 @@ T: git git://linuxtv.org/media_tree.git
S: Maintained
F: drivers/media/i2c/dw9714.c
+DONGWOON DW9807 LENS VOICE COIL DRIVER
+M: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
+L: linux-media@xxxxxxxxxxxxxxx
+T: git git://linuxtv.org/media_tree.git
+S: Maintained
+F: drivers/media/i2c/dw9807.c
+
DOUBLETALK DRIVER
M: "James R. Van Zandt" <jrv@xxxxxxxxxxxxxxx>
L: blinux-list@xxxxxxxxxx
diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index cb5d7ff..fd01842 100644
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -325,6 +325,16 @@ config VIDEO_DW9714
capability. This is designed for linear control of
voice coil motors, controlled via I2C serial interface.
+config VIDEO_DW9807
+ tristate "DW9807 lens voice coil support"
+ depends on I2C && VIDEO_V4L2 && MEDIA_CONTROLLER
+ depends on VIDEO_V4L2_SUBDEV_API
+ ---help---
+ This is a driver for the DW9807 camera lens voice coil.
+ DW9807 is a 10 bit DAC with 100mA output current sink
+ capability. This is designed for linear control of
+ voice coil motors, controlled via I2C serial interface.
+
config VIDEO_SAA7110
tristate "Philips SAA7110 video decoder"
depends on VIDEO_V4L2 && I2C
diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
index 548a9ef..1b62639 100644
--- a/drivers/media/i2c/Makefile
+++ b/drivers/media/i2c/Makefile
@@ -23,6 +23,7 @@ obj-$(CONFIG_VIDEO_SAA7185) += saa7185.o
obj-$(CONFIG_VIDEO_SAA6752HS) += saa6752hs.o
obj-$(CONFIG_VIDEO_AD5820) += ad5820.o
obj-$(CONFIG_VIDEO_DW9714) += dw9714.o
+obj-$(CONFIG_VIDEO_DW9807) += dw9807.o
obj-$(CONFIG_VIDEO_ADV7170) += adv7170.o
obj-$(CONFIG_VIDEO_ADV7175) += adv7175.o
obj-$(CONFIG_VIDEO_ADV7180) += adv7180.o
diff --git a/drivers/media/i2c/dw9807.c b/drivers/media/i2c/dw9807.c
new file mode 100644
index 0000000..062c30f
--- /dev/null
+++ b/drivers/media/i2c/dw9807.c
@@ -0,0 +1,335 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Intel Corporation
+
+#include <linux/acpi.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/pm_runtime.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-device.h>
+
+#define DW9807_MAX_FOCUS_POS 1023
+/*
+ * This sets the minimum granularity for the focus positions.
+ * A value of 1 gives maximum accuracy for a desired focus position.
+ */
+#define DW9807_FOCUS_STEPS 1
+/*
+ * This acts as the minimum granularity of lens movement.
+ * Keep this value power of 2, so the control steps can be
+ * uniformly adjusted for gradual lens movement, with desired
+ * number of control steps.
+ */
+#define DW9807_CTRL_STEPS 16
+#define DW9807_CTRL_DELAY_US 1000
+
+#define DW9807_CTL_ADDR 0x02
+/*
+ * DW9807 separates two registers to control the VCM position.
+ * One for MSB value, another is LSB value.
+ */
+#define DW9807_MSB_ADDR 0x03
+#define DW9807_LSB_ADDR 0x04
+#define DW9807_STATUS_ADDR 0x05
+#define DW9807_MODE_ADDR 0x06
+#define DW9807_RESONANCE_ADDR 0x07
+
+#define MAX_RETRY 10
+
+struct dw9807_device {
+ struct v4l2_ctrl_handler ctrls_vcm;
+ struct v4l2_subdev sd;
+ u16 current_val;
+};
+
+static inline struct dw9807_device *sd_to_dw9807_vcm(
+ struct v4l2_subdev *subdev)
+{
+ return container_of(subdev, struct dw9807_device, sd);
+}
+
+static int dw9807_i2c_check(struct i2c_client *client)
+{
+ const char status_addr = DW9807_STATUS_ADDR;
+ char status_result;
+ int ret;
+
+ ret = i2c_master_send(client, (const char *)&status_addr,
+ sizeof(status_addr));
+ if (ret < 0) {
+ dev_err(&client->dev, "I2C write STATUS address fail ret = %d\n",
+ ret);
+ return ret;
+ }
+
+ ret = i2c_master_recv(client, (char *)&status_result,
+ sizeof(status_result));
+ if (ret != sizeof(status_result)) {
+ dev_err(&client->dev, "I2C read STATUS value fail ret=%d\n",
+ ret);
+ return ret;
+ }
+
+ return status_result;
+}
+
+static int dw9807_set_dac(struct i2c_client *client, u16 data)
+{
+ const char tx_data[3] = {
+ DW9807_MSB_ADDR, ((data >> 8) & 0x03), (data & 0xff)
+ };
+ int ret, retry = 0;
+
+ /*
+ * According to the datasheet, need to check the bus status before we
+ * write VCM position. This ensure that we really write the value
+ * into the register
+ */
+ while ((ret = dw9807_i2c_check(client)) != 0) {
+ if (ret < 0)
+ return ret;
+
+ if (MAX_RETRY == ++retry) {
+ dev_err(&client->dev,
+ "Cannot do the write operation because VCM is busy\n");
+ return -EIO;
+ }
+ usleep_range(DW9807_CTRL_DELAY_US, DW9807_CTRL_DELAY_US + 10);
+ }
+
+ /* Write VCM position to registers */
+ ret = i2c_master_send(client, tx_data, sizeof(tx_data));
+ if (ret != sizeof(tx_data)) {
+ if (ret < 0) {
+ dev_err(&client->dev,
+ "I2C write MSB fail ret=%d\n", ret);
+ return ret;
+ } else {
+ dev_err(&client->dev, "I2C write MSB fail, transmission size is not equal the size expected\n");
+ return -EIO;
+ }
+ }
+
+ return 0;
+}
+
+static int dw9807_set_ctrl(struct v4l2_ctrl *ctrl)
+{
+ struct dw9807_device *dev_vcm = container_of(ctrl->handler,
+ struct dw9807_device, ctrls_vcm);
+
+ if (ctrl->id == V4L2_CID_FOCUS_ABSOLUTE) {
+ struct i2c_client *client = v4l2_get_subdevdata(&dev_vcm->sd);
+
+ dev_vcm->current_val = ctrl->val;
+ return dw9807_set_dac(client, ctrl->val);
+ }
+
+ return -EINVAL;
+}
+
+static const struct v4l2_ctrl_ops dw9807_vcm_ctrl_ops = {
+ .s_ctrl = dw9807_set_ctrl,
+};
+
+static int dw9807_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
+{
+ int rval;
+
+ rval = pm_runtime_get_sync(sd->dev);
+ if (rval < 0) {
+ pm_runtime_put_noidle(sd->dev);
+ return rval;
+ }
+
+ return 0;
+}
+
+static int dw9807_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
+{
+ pm_runtime_put(sd->dev);
+
+ return 0;
+}
+
+static const struct v4l2_subdev_internal_ops dw9807_int_ops = {
+ .open = dw9807_open,
+ .close = dw9807_close,
+};
+
+static const struct v4l2_subdev_ops dw9807_ops = { };
+
+static void dw9807_subdev_cleanup(struct dw9807_device *dw9807_dev)
+{
+ v4l2_async_unregister_subdev(&dw9807_dev->sd);
+ v4l2_ctrl_handler_free(&dw9807_dev->ctrls_vcm);
+ media_entity_cleanup(&dw9807_dev->sd.entity);
+}
+
+static int dw9807_init_controls(struct dw9807_device *dev_vcm)
+{
+ struct v4l2_ctrl_handler *hdl = &dev_vcm->ctrls_vcm;
+ const struct v4l2_ctrl_ops *ops = &dw9807_vcm_ctrl_ops;
+ struct i2c_client *client = v4l2_get_subdevdata(&dev_vcm->sd);
+
+ v4l2_ctrl_handler_init(hdl, 1);
+
+ v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FOCUS_ABSOLUTE,
+ 0, DW9807_MAX_FOCUS_POS, DW9807_FOCUS_STEPS, 0);
+
+ dev_vcm->sd.ctrl_handler = hdl;
+ if (hdl->error) {
+ dev_err(&client->dev, "%s fail error: 0x%x\n",
+ __func__, hdl->error);
+ return hdl->error;
+ }
+
+ return 0;
+}
+
+static int dw9807_probe(struct i2c_client *client)
+{
+ struct dw9807_device *dw9807_dev;
+ int rval;
+
+ dw9807_dev = devm_kzalloc(&client->dev, sizeof(*dw9807_dev),
+ GFP_KERNEL);
+ if (!dw9807_dev)
+ return -ENOMEM;
+
+ v4l2_i2c_subdev_init(&dw9807_dev->sd, client, &dw9807_ops);
+ dw9807_dev->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+ dw9807_dev->sd.internal_ops = &dw9807_int_ops;
+
+ rval = dw9807_init_controls(dw9807_dev);
+ if (rval)
+ goto err_cleanup;
+
+ rval = media_entity_pads_init(&dw9807_dev->sd.entity, 0, NULL);
+ if (rval < 0)
+ goto err_cleanup;
+
+ dw9807_dev->sd.entity.function = MEDIA_ENT_F_LENS;
+
+ rval = v4l2_async_register_subdev(&dw9807_dev->sd);
+ if (rval < 0)
+ goto err_cleanup;
+
+ pm_runtime_set_active(&client->dev);
+ pm_runtime_enable(&client->dev);
+ pm_runtime_idle(&client->dev);
+
+ return 0;
+
+err_cleanup:
+ dw9807_subdev_cleanup(dw9807_dev);
+
+ return rval;
+}
+
+static int dw9807_remove(struct i2c_client *client)
+{
+ struct v4l2_subdev *sd = i2c_get_clientdata(client);
+ struct dw9807_device *dw9807_dev = sd_to_dw9807_vcm(sd);
+
+ pm_runtime_disable(&client->dev);
+ pm_runtime_set_suspended(&client->dev);
+
+ dw9807_subdev_cleanup(dw9807_dev);
+
+ return 0;
+}
+
+/*
+ * This function sets the vcm position, so it consumes least current
+ * The lens position is gradually moved in units of DW9807_CTRL_STEPS,
+ * to make the movements smoothly.
+ */
+static int __maybe_unused dw9807_vcm_suspend(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct v4l2_subdev *sd = i2c_get_clientdata(client);
+ struct dw9807_device *dw9807_dev = sd_to_dw9807_vcm(sd);
+ const char tx_data[2] = { DW9807_CTL_ADDR, 0x01 };
+ int ret, val;
+
+ for (val = dw9807_dev->current_val & ~(DW9807_CTRL_STEPS - 1);
+ val >= 0; val -= DW9807_CTRL_STEPS) {
+ ret = dw9807_set_dac(client, val);
+ if (ret)
+ dev_err_once(dev, "%s I2C failure: %d", __func__, ret);
+ usleep_range(DW9807_CTRL_DELAY_US, DW9807_CTRL_DELAY_US + 10);
+ }
+
+ /* Power down */
+ ret = i2c_master_send(client, tx_data, sizeof(tx_data));
+
+ if (ret != sizeof(tx_data)) {
+ dev_err(&client->dev, "I2C write CTL fail\n");
+ return -EIO;
+ }
+
+ return 0;
+}
+
+/*
+ * This function sets the vcm position to the value set by the user
+ * through v4l2_ctrl_ops s_ctrl handler
+ * The lens position is gradually moved in units of DW9807_CTRL_STEPS,
+ * to make the movements smoothly.
+ */
+static int __maybe_unused dw9807_vcm_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct v4l2_subdev *sd = i2c_get_clientdata(client);
+ struct dw9807_device *dw9807_dev = sd_to_dw9807_vcm(sd);
+ const char tx_data[2] = { DW9807_CTL_ADDR, 0x00 };
+ int ret, val;
+
+ /* Power on */
+ ret = i2c_master_send(client, tx_data, sizeof(tx_data));
+ if (ret != sizeof(tx_data)) {
+ dev_err(&client->dev, "I2C write CTL fail\n");
+ return -EIO;
+ }
+
+ for (val = dw9807_dev->current_val % DW9807_CTRL_STEPS;
+ val < dw9807_dev->current_val + DW9807_CTRL_STEPS - 1;
+ val += DW9807_CTRL_STEPS) {
+ ret = dw9807_set_dac(client, val);
+ if (ret)
+ dev_err_ratelimited(dev, "%s I2C failure: %d",
+ __func__, ret);
+ usleep_range(DW9807_CTRL_DELAY_US, DW9807_CTRL_DELAY_US + 10);
+ }
+
+ return 0;
+}
+
+static const struct of_device_id dw9807_of_table[] = {
+ { .compatible = "dongwoon,dw9807" },
+ { { 0 } }
+};
+MODULE_DEVICE_TABLE(of, dw9807_of_table);
+
+static const struct dev_pm_ops dw9807_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(dw9807_vcm_suspend, dw9807_vcm_resume)
+ SET_RUNTIME_PM_OPS(dw9807_vcm_suspend, dw9807_vcm_resume, NULL)
+};
+
+static struct i2c_driver dw9807_i2c_driver = {
+ .driver = {
+ .name = "dw9807",
+ .pm = &dw9807_pm_ops,
+ .of_match_table = dw9807_of_table,
+ },
+ .probe_new = dw9807_probe,
+ .remove = dw9807_remove,
+};
+
+module_i2c_driver(dw9807_i2c_driver);
+
+MODULE_AUTHOR("Chiang, Alan <alanx.chiang@xxxxxxxxx>");
+MODULE_DESCRIPTION("DW9807 VCM driver");
+MODULE_LICENSE("GPL v2");
--
2.7.4
--
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