* [PATCH v2 2/2] media: ak7375: Add ak7375 lens voice coil driver
2018-05-25 9:42 [PATCH v2 1/2] dt-bindings: Add bindings for AKM ak7375 voice coil lens bingbu.cao
@ 2018-05-25 9:42 ` bingbu.cao
0 siblings, 0 replies; 2+ messages in thread
From: bingbu.cao @ 2018-05-25 9:42 UTC (permalink / raw)
To: linux-media
From: Bingbu Cao <bingbu.cao@intel.com>
Add a V4L2 sub-device driver for the ak7375 lens voice coil.
This is a voice coil module using the I2C bus to control the
focus position.
Signed-off-by: Tianshu Qiu <tian.shu.qiu@intel.com>
Signed-off-by: Bingbu Cao <bingbu.cao@intel.com>
---
MAINTAINERS | 8 ++
drivers/media/i2c/Kconfig | 10 ++
drivers/media/i2c/Makefile | 1 +
drivers/media/i2c/ak7375.c | 278 +++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 297 insertions(+)
create mode 100644 drivers/media/i2c/ak7375.c
diff --git a/MAINTAINERS b/MAINTAINERS
index ea362219c4aa..20379a7baca0 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -625,6 +625,14 @@ T: git git://linuxtv.org/anttip/media_tree.git
S: Maintained
F: drivers/media/usb/airspy/
+AKM AK7375 LENS VOICE COIL DRIVER
+M: Tianshu Qiu <tian.shu.qiu@intel.com>
+L: linux-media@vger.kernel.org
+T: git git://linuxtv.org/media_tree.git
+S: Maintained
+F: drivers/media/i2c/ak7375.c
+F: Documentation/devicetree/bindings/media/i2c/akm,ak7375.txt
+
ALACRITECH GIGABIT ETHERNET DRIVER
M: Lino Sanfilippo <LinoSanfilippo@gmx.de>
S: Maintained
diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index 341452fe98df..ff3cb5afb0e1 100644
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -326,6 +326,16 @@ config VIDEO_AD5820
This is a driver for the AD5820 camera lens voice coil.
It is used for example in Nokia N900 (RX-51).
+config VIDEO_AK7375
+ tristate "AK7375 lens voice coil support"
+ depends on I2C && VIDEO_V4L2 && MEDIA_CONTROLLER
+ depends on VIDEO_V4L2_SUBDEV_API
+ help
+ This is a driver for the AK7375 camera lens voice coil.
+ AK7375 is a 12 bit DAC with 120mA output current sink
+ capability. This is designed for linear control of
+ voice coil motors, controlled via I2C serial interface.
+
config VIDEO_DW9714
tristate "DW9714 lens voice coil support"
depends on I2C && VIDEO_V4L2 && MEDIA_CONTROLLER
diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
index d679d57cd3b3..05b97e319ea9 100644
--- a/drivers/media/i2c/Makefile
+++ b/drivers/media/i2c/Makefile
@@ -23,6 +23,7 @@ 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-$(CONFIG_VIDEO_AK7375) += ak7375.o
obj-$(CONFIG_VIDEO_DW9714) += dw9714.o
obj-$(CONFIG_VIDEO_ADV7170) += adv7170.o
obj-$(CONFIG_VIDEO_ADV7175) += adv7175.o
diff --git a/drivers/media/i2c/ak7375.c b/drivers/media/i2c/ak7375.c
new file mode 100644
index 000000000000..012e673e9ced
--- /dev/null
+++ b/drivers/media/i2c/ak7375.c
@@ -0,0 +1,278 @@
+// 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 AK7375_MAX_FOCUS_POS 4095
+/*
+ * This sets the minimum granularity for the focus positions.
+ * A value of 1 gives maximum accuracy for a desired focus position
+ */
+#define AK7375_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 AK7375_CTRL_STEPS 64
+#define AK7375_CTRL_DELAY_US 1000
+
+#define AK7375_REG_POSITION 0x0
+#define AK7375_REG_CONT 0x2
+#define AK7375_MODE_ACTIVE 0x0
+#define AK7375_MODE_STANDBY 0x40
+
+/* ak7375 device structure */
+struct ak7375_device {
+ struct v4l2_ctrl_handler ctrls_vcm;
+ struct v4l2_subdev sd;
+ struct v4l2_ctrl *focus;
+};
+
+static inline struct ak7375_device *to_ak7375_vcm(struct v4l2_ctrl *ctrl)
+{
+ return container_of(ctrl->handler, struct ak7375_device, ctrls_vcm);
+}
+
+static inline struct ak7375_device *sd_to_ak7375_vcm(struct v4l2_subdev *subdev)
+{
+ return container_of(subdev, struct ak7375_device, sd);
+}
+
+static int ak7375_i2c_write(struct ak7375_device *ak7375,
+ u8 addr, u16 data, int size)
+{
+ struct i2c_client *client = v4l2_get_subdevdata(&ak7375->sd);
+ int ret;
+ u8 buf[3];
+
+ if (size != 1 && size != 2)
+ return -EINVAL;
+ buf[0] = addr;
+ buf[2] = data & 0xff;
+ if (size == 2)
+ buf[1] = data >> 8;
+ ret = i2c_master_send(client, (const char *)buf, size + 1);
+ if (ret < 0)
+ return ret;
+ if (ret != size + 1)
+ return -EIO;
+ return 0;
+}
+
+static int ak7375_set_ctrl(struct v4l2_ctrl *ctrl)
+{
+ struct ak7375_device *dev_vcm = to_ak7375_vcm(ctrl);
+
+ if (ctrl->id == V4L2_CID_FOCUS_ABSOLUTE)
+ return ak7375_i2c_write(dev_vcm, AK7375_REG_POSITION,
+ ctrl->val << 4, 2);
+
+ return -EINVAL;
+}
+
+static const struct v4l2_ctrl_ops ak7375_vcm_ctrl_ops = {
+ .s_ctrl = ak7375_set_ctrl,
+};
+
+static int ak7375_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 ak7375_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
+{
+ pm_runtime_put(sd->dev);
+
+ return 0;
+}
+
+static const struct v4l2_subdev_internal_ops ak7375_int_ops = {
+ .open = ak7375_open,
+ .close = ak7375_close,
+};
+
+static const struct v4l2_subdev_ops ak7375_ops = { };
+
+static void ak7375_subdev_cleanup(struct ak7375_device *ak7375_dev)
+{
+ v4l2_async_unregister_subdev(&ak7375_dev->sd);
+ v4l2_ctrl_handler_free(&ak7375_dev->ctrls_vcm);
+ media_entity_cleanup(&ak7375_dev->sd.entity);
+}
+
+static int ak7375_init_controls(struct ak7375_device *dev_vcm)
+{
+ struct v4l2_ctrl_handler *hdl = &dev_vcm->ctrls_vcm;
+ const struct v4l2_ctrl_ops *ops = &ak7375_vcm_ctrl_ops;
+
+ v4l2_ctrl_handler_init(hdl, 1);
+
+ dev_vcm->focus = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FOCUS_ABSOLUTE,
+ 0, AK7375_MAX_FOCUS_POS, AK7375_FOCUS_STEPS, 0);
+
+ if (hdl->error)
+ dev_err(dev_vcm->sd.dev, "%s fail error: 0x%x\n",
+ __func__, hdl->error);
+ dev_vcm->sd.ctrl_handler = hdl;
+ return hdl->error;
+}
+
+static int ak7375_probe(struct i2c_client *client)
+{
+ struct ak7375_device *ak7375_dev;
+ int val;
+
+ ak7375_dev = devm_kzalloc(&client->dev, sizeof(*ak7375_dev),
+ GFP_KERNEL);
+ if (!ak7375_dev)
+ return -ENOMEM;
+
+ v4l2_i2c_subdev_init(&ak7375_dev->sd, client, &ak7375_ops);
+ ak7375_dev->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+ ak7375_dev->sd.internal_ops = &ak7375_int_ops;
+ ak7375_dev->sd.entity.function = MEDIA_ENT_F_LENS;
+
+ val = ak7375_init_controls(ak7375_dev);
+ if (val)
+ goto err_cleanup;
+
+ val = media_entity_pads_init(&ak7375_dev->sd.entity, 0, NULL);
+ if (val < 0)
+ goto err_cleanup;
+
+ val = v4l2_async_register_subdev(&ak7375_dev->sd);
+ if (val < 0)
+ goto err_cleanup;
+
+ pm_runtime_set_active(&client->dev);
+ pm_runtime_enable(&client->dev);
+ pm_runtime_idle(&client->dev);
+
+ return 0;
+
+err_cleanup:
+ v4l2_ctrl_handler_free(&ak7375_dev->ctrls_vcm);
+ media_entity_cleanup(&ak7375_dev->sd.entity);
+ dev_err(&client->dev, "Probe failed: %d\n", val);
+ return val;
+}
+
+static int ak7375_remove(struct i2c_client *client)
+{
+ struct v4l2_subdev *sd = i2c_get_clientdata(client);
+ struct ak7375_device *ak7375_dev = sd_to_ak7375_vcm(sd);
+
+ ak7375_subdev_cleanup(ak7375_dev);
+ pm_runtime_disable(&client->dev);
+ pm_runtime_set_suspended(&client->dev);
+
+ return 0;
+}
+
+/*
+ * This function sets the vcm position, so it consumes least current
+ * The lens position is gradually moved in units of AK7375_CTRL_STEPS,
+ * to make the movements smoothly.
+ */
+static int __maybe_unused ak7375_vcm_suspend(struct device *dev)
+{
+
+ struct i2c_client *client = to_i2c_client(dev);
+ struct v4l2_subdev *sd = i2c_get_clientdata(client);
+ struct ak7375_device *ak7375_dev = sd_to_ak7375_vcm(sd);
+ int ret, val;
+
+ for (val = ak7375_dev->focus->val & ~(AK7375_CTRL_STEPS - 1);
+ val >= 0; val -= AK7375_CTRL_STEPS) {
+ ret = ak7375_i2c_write(ak7375_dev, AK7375_REG_POSITION,
+ val << 4, 2);
+ if (ret)
+ dev_err_once(dev, "%s I2C failure: %d\n",
+ __func__, ret);
+ usleep_range(AK7375_CTRL_DELAY_US, AK7375_CTRL_DELAY_US + 10);
+ }
+
+ ret = ak7375_i2c_write(ak7375_dev, AK7375_REG_CONT,
+ AK7375_MODE_STANDBY, 1);
+ if (ret) {
+ dev_err(dev, "%s I2C failure: %d\n", __func__, ret);
+ return ret;
+ }
+ 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 AK7375_CTRL_STEPS,
+ * to make the movements smoothly.
+ */
+static int __maybe_unused ak7375_vcm_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct v4l2_subdev *sd = i2c_get_clientdata(client);
+ struct ak7375_device *ak7375_dev = sd_to_ak7375_vcm(sd);
+ int ret, val;
+
+ ret = ak7375_i2c_write(ak7375_dev, AK7375_REG_CONT,
+ AK7375_MODE_ACTIVE, 1);
+ if (ret) {
+ dev_err(dev, "%s I2C failure: %d\n", __func__, ret);
+ return ret;
+ }
+
+ for (val = ak7375_dev->focus->val % AK7375_CTRL_STEPS;
+ val <= ak7375_dev->focus->val;
+ val += AK7375_CTRL_STEPS) {
+ ret = ak7375_i2c_write(ak7375_dev, AK7375_REG_POSITION,
+ val << 4, 2);
+ if (ret)
+ dev_err_ratelimited(dev, "%s I2C failure: %d\n",
+ __func__, ret);
+ usleep_range(AK7375_CTRL_DELAY_US, AK7375_CTRL_DELAY_US + 10);
+ }
+ return 0;
+}
+
+static const struct of_device_id ak7375_of_table[] = {
+ { .compatible = "akm,ak7375" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, ak7375_of_table);
+
+static const struct dev_pm_ops ak7375_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(ak7375_vcm_suspend, ak7375_vcm_resume)
+ SET_RUNTIME_PM_OPS(ak7375_vcm_suspend, ak7375_vcm_resume, NULL)
+};
+
+static struct i2c_driver ak7375_i2c_driver = {
+ .driver = {
+ .name = "ak7375",
+ .pm = &ak7375_pm_ops,
+ .of_match_table = ak7375_of_table,
+ },
+ .probe_new = ak7375_probe,
+ .remove = ak7375_remove,
+};
+module_i2c_driver(ak7375_i2c_driver);
+
+MODULE_AUTHOR("Tianshu Qiu <tian.shu.qiu@intel.com>");
+MODULE_AUTHOR("Bingbu Cao <bingbu.cao@intel.com>");
+MODULE_DESCRIPTION("AK7375 VCM driver");
+MODULE_LICENSE("GPL v2");
--
1.9.1
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