]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/commitdiff
[media] dw9714: Initial driver for dw9714 VCM
authorRajmohan Mani <rajmohan.mani@intel.com>
Sat, 3 Jun 2017 08:11:40 +0000 (05:11 -0300)
committerMauro Carvalho Chehab <mchehab@s-opensource.com>
Tue, 20 Jun 2017 11:17:48 +0000 (08:17 -0300)
DW9714 is a 10 bit DAC, designed for linear
control of voice coil motor.

This driver creates a V4L2 subdevice and
provides control to set the desired focus.

[Sakari Ailus: Add MAINTAINERS entry.]

Signed-off-by: Rajmohan Mani <rajmohan.mani@intel.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
MAINTAINERS
drivers/media/i2c/Kconfig
drivers/media/i2c/Makefile
drivers/media/i2c/dw9714.c [new file with mode: 0644]

index 753bb2173a767a4102cbb1ac6c89e2f0f0a50736..749426702fa23fd9879156a22a552ec341955bfc 100644 (file)
@@ -4693,6 +4693,13 @@ S:       Maintained
 F:     drivers/media/usb/dvb-usb-v2/dvb_usb*
 F:     drivers/media/usb/dvb-usb-v2/usb_urb.c
 
+DONGWOON DW9714 LENS VOICE COIL DRIVER
+M:     Sakari Ailus <sakari.ailus@linux.intel.com>
+L:     linux-media@vger.kernel.org
+T:     git git://linuxtv.org/media_tree.git
+S:     Maintained
+F:     drivers/media/i2c/dw9714.c
+
 DYNAMIC DEBUG
 M:     Jason Baron <jbaron@akamai.com>
 S:     Maintained
index 338ae6fb35fd14d3115749bd6f77c68e0e3223cd..121b3b5394cbae97165ecd493714d2012d71c69a 100644 (file)
@@ -303,6 +303,16 @@ 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_DW9714
+       tristate "DW9714 lens voice coil support"
+       depends on I2C && VIDEO_V4L2 && MEDIA_CONTROLLER
+       depends on VIDEO_V4L2_SUBDEV_API
+       ---help---
+         This is a driver for the DW9714 camera lens voice coil.
+         DW9714 is a 10 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_SAA7110
        tristate "Philips SAA7110 video decoder"
        depends on VIDEO_V4L2 && I2C
index caa59cb1f58859a40b50feb3e802caed11a6d8a9..2c0868fa603430b1805d97776639bb1c2873017f 100644 (file)
@@ -21,6 +21,7 @@ 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-$(CONFIG_VIDEO_DW9714)  += dw9714.o
 obj-$(CONFIG_VIDEO_ADV7170) += adv7170.o
 obj-$(CONFIG_VIDEO_ADV7175) += adv7175.o
 obj-$(CONFIG_VIDEO_ADV7180) += adv7180.o
diff --git a/drivers/media/i2c/dw9714.c b/drivers/media/i2c/dw9714.c
new file mode 100644 (file)
index 0000000..6a607d7
--- /dev/null
@@ -0,0 +1,291 @@
+/*
+ * Copyright (c) 2015--2017 Intel Corporation.
+ *
+ * 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.
+ */
+
+#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 DW9714_NAME            "dw9714"
+#define DW9714_MAX_FOCUS_POS   1023
+/*
+ * 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 DW9714_CTRL_STEPS      16
+#define DW9714_CTRL_DELAY_US   1000
+/*
+ * S[3:2] = 0x00, codes per step for "Linear Slope Control"
+ * S[1:0] = 0x00, step period
+ */
+#define DW9714_DEFAULT_S 0x0
+#define DW9714_VAL(data, s) ((data) << 4 | (s))
+
+/* dw9714 device structure */
+struct dw9714_device {
+       struct i2c_client *client;
+       struct v4l2_ctrl_handler ctrls_vcm;
+       struct v4l2_subdev sd;
+       u16 current_val;
+};
+
+static inline struct dw9714_device *to_dw9714_vcm(struct v4l2_ctrl *ctrl)
+{
+       return container_of(ctrl->handler, struct dw9714_device, ctrls_vcm);
+}
+
+static inline struct dw9714_device *sd_to_dw9714_vcm(struct v4l2_subdev *subdev)
+{
+       return container_of(subdev, struct dw9714_device, sd);
+}
+
+static int dw9714_i2c_write(struct i2c_client *client, u16 data)
+{
+       int ret;
+       u16 val = cpu_to_be16(data);
+
+       ret = i2c_master_send(client, (const char *)&val, sizeof(val));
+       if (ret != sizeof(val)) {
+               dev_err(&client->dev, "I2C write fail\n");
+               return -EIO;
+       }
+       return 0;
+}
+
+static int dw9714_t_focus_vcm(struct dw9714_device *dw9714_dev, u16 val)
+{
+       struct i2c_client *client = dw9714_dev->client;
+
+       dw9714_dev->current_val = val;
+
+       return dw9714_i2c_write(client, DW9714_VAL(val, DW9714_DEFAULT_S));
+}
+
+static int dw9714_set_ctrl(struct v4l2_ctrl *ctrl)
+{
+       struct dw9714_device *dev_vcm = to_dw9714_vcm(ctrl);
+
+       if (ctrl->id == V4L2_CID_FOCUS_ABSOLUTE)
+               return dw9714_t_focus_vcm(dev_vcm, ctrl->val);
+
+       return -EINVAL;
+}
+
+static const struct v4l2_ctrl_ops dw9714_vcm_ctrl_ops = {
+       .s_ctrl = dw9714_set_ctrl,
+};
+
+static int dw9714_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
+{
+       struct dw9714_device *dw9714_dev = sd_to_dw9714_vcm(sd);
+       struct device *dev = &dw9714_dev->client->dev;
+       int rval;
+
+       rval = pm_runtime_get_sync(dev);
+       if (rval < 0) {
+               pm_runtime_put_noidle(dev);
+               return rval;
+       }
+
+       return 0;
+}
+
+static int dw9714_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
+{
+       struct dw9714_device *dw9714_dev = sd_to_dw9714_vcm(sd);
+       struct device *dev = &dw9714_dev->client->dev;
+
+       pm_runtime_put(dev);
+
+       return 0;
+}
+
+static const struct v4l2_subdev_internal_ops dw9714_int_ops = {
+       .open = dw9714_open,
+       .close = dw9714_close,
+};
+
+static const struct v4l2_subdev_ops dw9714_ops = { };
+
+static void dw9714_subdev_cleanup(struct dw9714_device *dw9714_dev)
+{
+       v4l2_async_unregister_subdev(&dw9714_dev->sd);
+       v4l2_ctrl_handler_free(&dw9714_dev->ctrls_vcm);
+       media_entity_cleanup(&dw9714_dev->sd.entity);
+}
+
+static int dw9714_init_controls(struct dw9714_device *dev_vcm)
+{
+       struct v4l2_ctrl_handler *hdl = &dev_vcm->ctrls_vcm;
+       const struct v4l2_ctrl_ops *ops = &dw9714_vcm_ctrl_ops;
+       struct i2c_client *client = dev_vcm->client;
+
+       v4l2_ctrl_handler_init(hdl, 1);
+
+       v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FOCUS_ABSOLUTE,
+                         0, DW9714_MAX_FOCUS_POS, DW9714_CTRL_STEPS, 0);
+
+       if (hdl->error)
+               dev_err(&client->dev, "%s fail error: 0x%x\n",
+                       __func__, hdl->error);
+       dev_vcm->sd.ctrl_handler = hdl;
+       return hdl->error;
+}
+
+static int dw9714_probe(struct i2c_client *client,
+                       const struct i2c_device_id *devid)
+{
+       struct dw9714_device *dw9714_dev;
+       int rval;
+
+       dw9714_dev = devm_kzalloc(&client->dev, sizeof(*dw9714_dev),
+                                 GFP_KERNEL);
+       if (dw9714_dev == NULL)
+               return -ENOMEM;
+
+       dw9714_dev->client = client;
+
+       v4l2_i2c_subdev_init(&dw9714_dev->sd, client, &dw9714_ops);
+       dw9714_dev->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+       dw9714_dev->sd.internal_ops = &dw9714_int_ops;
+
+       rval = dw9714_init_controls(dw9714_dev);
+       if (rval)
+               goto err_cleanup;
+
+       rval = media_entity_pads_init(&dw9714_dev->sd.entity, 0, NULL);
+       if (rval < 0)
+               goto err_cleanup;
+
+       dw9714_dev->sd.entity.function = MEDIA_ENT_F_LENS;
+
+       rval = v4l2_async_register_subdev(&dw9714_dev->sd);
+       if (rval < 0)
+               goto err_cleanup;
+
+       pm_runtime_set_active(&client->dev);
+       pm_runtime_enable(&client->dev);
+
+       return 0;
+
+err_cleanup:
+       dw9714_subdev_cleanup(dw9714_dev);
+       dev_err(&client->dev, "Probe failed: %d\n", rval);
+       return rval;
+}
+
+static int dw9714_remove(struct i2c_client *client)
+{
+       struct v4l2_subdev *sd = i2c_get_clientdata(client);
+       struct dw9714_device *dw9714_dev = sd_to_dw9714_vcm(sd);
+
+       pm_runtime_disable(&client->dev);
+       dw9714_subdev_cleanup(dw9714_dev);
+
+       return 0;
+}
+
+/*
+ * This function sets the vcm position, so it consumes least current
+ * The lens position is gradually moved in units of DW9714_CTRL_STEPS,
+ * to make the movements smoothly.
+ */
+static int __maybe_unused dw9714_vcm_suspend(struct device *dev)
+{
+       struct i2c_client *client = to_i2c_client(dev);
+       struct v4l2_subdev *sd = i2c_get_clientdata(client);
+       struct dw9714_device *dw9714_dev = sd_to_dw9714_vcm(sd);
+       int ret, val;
+
+       for (val = dw9714_dev->current_val & ~(DW9714_CTRL_STEPS - 1);
+            val >= 0; val -= DW9714_CTRL_STEPS) {
+               ret = dw9714_i2c_write(client,
+                                      DW9714_VAL(val, DW9714_DEFAULT_S));
+               if (ret)
+                       dev_err_once(dev, "%s I2C failure: %d", __func__, ret);
+               usleep_range(DW9714_CTRL_DELAY_US, DW9714_CTRL_DELAY_US + 10);
+       }
+       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 DW9714_CTRL_STEPS,
+ * to make the movements smoothly.
+ */
+static int  __maybe_unused dw9714_vcm_resume(struct device *dev)
+{
+       struct i2c_client *client = to_i2c_client(dev);
+       struct v4l2_subdev *sd = i2c_get_clientdata(client);
+       struct dw9714_device *dw9714_dev = sd_to_dw9714_vcm(sd);
+       int ret, val;
+
+       for (val = dw9714_dev->current_val % DW9714_CTRL_STEPS;
+            val < dw9714_dev->current_val + DW9714_CTRL_STEPS - 1;
+            val += DW9714_CTRL_STEPS) {
+               ret = dw9714_i2c_write(client,
+                                      DW9714_VAL(val, DW9714_DEFAULT_S));
+               if (ret)
+                       dev_err_ratelimited(dev, "%s I2C failure: %d",
+                                               __func__, ret);
+               usleep_range(DW9714_CTRL_DELAY_US, DW9714_CTRL_DELAY_US + 10);
+       }
+
+       return 0;
+}
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id dw9714_acpi_match[] = {
+       {},
+};
+MODULE_DEVICE_TABLE(acpi, dw9714_acpi_match);
+#endif
+
+static const struct i2c_device_id dw9714_id_table[] = {
+       {DW9714_NAME, 0},
+       {}
+};
+
+MODULE_DEVICE_TABLE(i2c, dw9714_id_table);
+
+static const struct dev_pm_ops dw9714_pm_ops = {
+       SET_SYSTEM_SLEEP_PM_OPS(dw9714_vcm_suspend, dw9714_vcm_resume)
+       SET_RUNTIME_PM_OPS(dw9714_vcm_suspend, dw9714_vcm_resume, NULL)
+};
+
+static struct i2c_driver dw9714_i2c_driver = {
+       .driver = {
+               .name = DW9714_NAME,
+               .pm = &dw9714_pm_ops,
+               .acpi_match_table = ACPI_PTR(dw9714_acpi_match),
+       },
+       .probe = dw9714_probe,
+       .remove = dw9714_remove,
+       .id_table = dw9714_id_table,
+};
+
+module_i2c_driver(dw9714_i2c_driver);
+
+MODULE_AUTHOR("Tianshu Qiu <tian.shu.qiu@intel.com>");
+MODULE_AUTHOR("Jian Xu Zheng <jian.xu.zheng@intel.com>");
+MODULE_AUTHOR("Yuning Pu <yuning.pu@intel.com>");
+MODULE_AUTHOR("Jouni Ukkonen <jouni.ukkonen@intel.com>");
+MODULE_AUTHOR("Tommi Franttila <tommi.franttila@intel.com>");
+MODULE_DESCRIPTION("DW9714 VCM driver");
+MODULE_LICENSE("GPL v2");