media: i2c: Add driver for DW9719 VCM
Add a driver for the DW9719 VCM. The driver creates a v4l2 subdevice and registers a control to set the desired focus. Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Daniel Scally <djrscally@gmail.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Daniel Scally
Mauro Carvalho Chehab
parent
f663fb4967
commit
fed60fc552
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@ -6243,6 +6243,13 @@ T: git git://linuxtv.org/media_tree.git
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F: Documentation/devicetree/bindings/media/i2c/dongwoon,dw9714.yaml
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F: drivers/media/i2c/dw9714.c
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DONGWOON DW9719 LENS VOICE COIL DRIVER
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M: Daniel Scally <djrscally@gmail.com>
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L: linux-media@vger.kernel.org
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S: Maintained
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T: git git://linuxtv.org/media_tree.git
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F: drivers/media/i2c/dw9719.c
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DONGWOON DW9768 LENS VOICE COIL DRIVER
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L: linux-media@vger.kernel.org
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S: Orphan
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@ -652,6 +652,18 @@ config VIDEO_DW9714
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capability. This is designed for linear control of
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voice coil motors, controlled via I2C serial interface.
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config VIDEO_DW9719
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tristate "DW9719 lens voice coil support"
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depends on I2C && VIDEO_DEV
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select MEDIA_CONTROLLER
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select VIDEO_V4L2_SUBDEV_API
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select V4L2_ASYNC
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select V4L2_CCI_I2C
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help
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This is a driver for the DW9719 camera lens voice coil.
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This is designed for linear control of voice coil motors,
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controlled via I2C serial interface.
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config VIDEO_DW9768
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tristate "DW9768 lens voice coil support"
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depends on I2C && VIDEO_DEV
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@ -32,6 +32,7 @@ obj-$(CONFIG_VIDEO_DS90UB913) += ds90ub913.o
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obj-$(CONFIG_VIDEO_DS90UB953) += ds90ub953.o
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obj-$(CONFIG_VIDEO_DS90UB960) += ds90ub960.o
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obj-$(CONFIG_VIDEO_DW9714) += dw9714.o
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obj-$(CONFIG_VIDEO_DW9719) += dw9719.o
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obj-$(CONFIG_VIDEO_DW9768) += dw9768.o
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obj-$(CONFIG_VIDEO_DW9807_VCM) += dw9807-vcm.o
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obj-$(CONFIG_VIDEO_ET8EK8) += et8ek8/
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@ -0,0 +1,350 @@
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2012 Intel Corporation
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/*
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* Based on linux/modules/camera/drivers/media/i2c/imx/dw9719.c in this repo:
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* https://github.com/ZenfoneArea/android_kernel_asus_zenfone5
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*/
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#include <linux/delay.h>
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#include <linux/i2c.h>
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#include <linux/pm_runtime.h>
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#include <linux/regulator/consumer.h>
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#include <linux/types.h>
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#include <media/v4l2-cci.h>
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#include <media/v4l2-common.h>
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#include <media/v4l2-ctrls.h>
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#include <media/v4l2-subdev.h>
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#define DW9719_MAX_FOCUS_POS 1023
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#define DW9719_CTRL_STEPS 16
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#define DW9719_CTRL_DELAY_US 1000
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#define DW9719_INFO CCI_REG8(0)
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#define DW9719_ID 0xF1
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#define DW9719_CONTROL CCI_REG8(2)
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#define DW9719_ENABLE_RINGING 0x02
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#define DW9719_VCM_CURRENT CCI_REG16(3)
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#define DW9719_MODE CCI_REG8(6)
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#define DW9719_MODE_SAC_SHIFT 4
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#define DW9719_MODE_SAC3 4
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#define DW9719_VCM_FREQ CCI_REG8(7)
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#define DW9719_DEFAULT_VCM_FREQ 0x60
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#define to_dw9719_device(x) container_of(x, struct dw9719_device, sd)
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struct dw9719_device {
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struct v4l2_subdev sd;
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struct device *dev;
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struct regmap *regmap;
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struct regulator *regulator;
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u32 sac_mode;
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u32 vcm_freq;
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struct dw9719_v4l2_ctrls {
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struct v4l2_ctrl_handler handler;
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struct v4l2_ctrl *focus;
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} ctrls;
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};
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static int dw9719_detect(struct dw9719_device *dw9719)
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{
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int ret;
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u64 val;
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ret = cci_read(dw9719->regmap, DW9719_INFO, &val, NULL);
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if (ret < 0)
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return ret;
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if (val != DW9719_ID) {
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dev_err(dw9719->dev, "Failed to detect correct id\n");
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return -ENXIO;
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}
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return 0;
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}
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static int dw9719_power_down(struct dw9719_device *dw9719)
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{
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return regulator_disable(dw9719->regulator);
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}
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static int dw9719_power_up(struct dw9719_device *dw9719)
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{
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int ret;
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ret = regulator_enable(dw9719->regulator);
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if (ret)
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return ret;
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/* Jiggle SCL pin to wake up device */
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cci_write(dw9719->regmap, DW9719_CONTROL, 1, &ret);
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/* Need 100us to transit from SHUTDOWN to STANDBY */
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fsleep(100);
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cci_write(dw9719->regmap, DW9719_CONTROL, DW9719_ENABLE_RINGING, &ret);
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cci_write(dw9719->regmap, DW9719_MODE,
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dw9719->sac_mode << DW9719_MODE_SAC_SHIFT, &ret);
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cci_write(dw9719->regmap, DW9719_VCM_FREQ, dw9719->vcm_freq, &ret);
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if (ret)
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dw9719_power_down(dw9719);
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return ret;
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}
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static int dw9719_t_focus_abs(struct dw9719_device *dw9719, s32 value)
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{
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return cci_write(dw9719->regmap, DW9719_VCM_CURRENT, value, NULL);
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}
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static int dw9719_set_ctrl(struct v4l2_ctrl *ctrl)
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{
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struct dw9719_device *dw9719 = container_of(ctrl->handler,
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struct dw9719_device,
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ctrls.handler);
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int ret;
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/* Only apply changes to the controls if the device is powered up */
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if (!pm_runtime_get_if_in_use(dw9719->dev))
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return 0;
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switch (ctrl->id) {
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case V4L2_CID_FOCUS_ABSOLUTE:
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ret = dw9719_t_focus_abs(dw9719, ctrl->val);
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break;
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default:
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ret = -EINVAL;
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}
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pm_runtime_put(dw9719->dev);
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return ret;
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}
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static const struct v4l2_ctrl_ops dw9719_ctrl_ops = {
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.s_ctrl = dw9719_set_ctrl,
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};
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static int dw9719_suspend(struct device *dev)
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{
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struct v4l2_subdev *sd = dev_get_drvdata(dev);
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struct dw9719_device *dw9719 = to_dw9719_device(sd);
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int ret;
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int val;
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for (val = dw9719->ctrls.focus->val; val >= 0;
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val -= DW9719_CTRL_STEPS) {
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ret = dw9719_t_focus_abs(dw9719, val);
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if (ret)
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return ret;
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usleep_range(DW9719_CTRL_DELAY_US, DW9719_CTRL_DELAY_US + 10);
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}
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return dw9719_power_down(dw9719);
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}
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static int dw9719_resume(struct device *dev)
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{
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struct v4l2_subdev *sd = dev_get_drvdata(dev);
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struct dw9719_device *dw9719 = to_dw9719_device(sd);
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int current_focus = dw9719->ctrls.focus->val;
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int ret;
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int val;
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ret = dw9719_power_up(dw9719);
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if (ret)
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return ret;
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for (val = current_focus % DW9719_CTRL_STEPS; val < current_focus;
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val += DW9719_CTRL_STEPS) {
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ret = dw9719_t_focus_abs(dw9719, val);
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if (ret)
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goto err_power_down;
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usleep_range(DW9719_CTRL_DELAY_US, DW9719_CTRL_DELAY_US + 10);
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}
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return 0;
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err_power_down:
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dw9719_power_down(dw9719);
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return ret;
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}
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static int dw9719_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
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{
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return pm_runtime_resume_and_get(sd->dev);
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}
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static int dw9719_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
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{
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pm_runtime_put(sd->dev);
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return 0;
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}
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static const struct v4l2_subdev_internal_ops dw9719_internal_ops = {
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.open = dw9719_open,
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.close = dw9719_close,
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};
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static int dw9719_init_controls(struct dw9719_device *dw9719)
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{
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const struct v4l2_ctrl_ops *ops = &dw9719_ctrl_ops;
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int ret;
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v4l2_ctrl_handler_init(&dw9719->ctrls.handler, 1);
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dw9719->ctrls.focus = v4l2_ctrl_new_std(&dw9719->ctrls.handler, ops,
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V4L2_CID_FOCUS_ABSOLUTE, 0,
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DW9719_MAX_FOCUS_POS, 1, 0);
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if (dw9719->ctrls.handler.error) {
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dev_err(dw9719->dev, "Error initialising v4l2 ctrls\n");
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ret = dw9719->ctrls.handler.error;
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goto err_free_handler;
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}
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dw9719->sd.ctrl_handler = &dw9719->ctrls.handler;
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return 0;
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err_free_handler:
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v4l2_ctrl_handler_free(&dw9719->ctrls.handler);
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return ret;
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}
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static const struct v4l2_subdev_ops dw9719_ops = { };
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static int dw9719_probe(struct i2c_client *client)
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{
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struct dw9719_device *dw9719;
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int ret;
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dw9719 = devm_kzalloc(&client->dev, sizeof(*dw9719), GFP_KERNEL);
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if (!dw9719)
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return -ENOMEM;
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dw9719->regmap = devm_cci_regmap_init_i2c(client, 8);
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if (IS_ERR(dw9719->regmap))
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return PTR_ERR(dw9719->regmap);
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dw9719->dev = &client->dev;
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dw9719->sac_mode = DW9719_MODE_SAC3;
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dw9719->vcm_freq = DW9719_DEFAULT_VCM_FREQ;
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/* Optional indication of SAC mode select */
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device_property_read_u32(&client->dev, "dongwoon,sac-mode",
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&dw9719->sac_mode);
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/* Optional indication of VCM frequency */
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device_property_read_u32(&client->dev, "dongwoon,vcm-freq",
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&dw9719->vcm_freq);
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dw9719->regulator = devm_regulator_get(&client->dev, "vdd");
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if (IS_ERR(dw9719->regulator))
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return dev_err_probe(&client->dev, PTR_ERR(dw9719->regulator),
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"getting regulator\n");
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v4l2_i2c_subdev_init(&dw9719->sd, client, &dw9719_ops);
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dw9719->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
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dw9719->sd.internal_ops = &dw9719_internal_ops;
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ret = dw9719_init_controls(dw9719);
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if (ret)
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return ret;
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ret = media_entity_pads_init(&dw9719->sd.entity, 0, NULL);
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if (ret < 0)
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goto err_free_ctrl_handler;
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dw9719->sd.entity.function = MEDIA_ENT_F_LENS;
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/*
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* We need the driver to work in the event that pm runtime is disable in
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* the kernel, so power up and verify the chip now. In the event that
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* runtime pm is disabled this will leave the chip on, so that the lens
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* will work.
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*/
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ret = dw9719_power_up(dw9719);
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if (ret)
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goto err_cleanup_media;
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ret = dw9719_detect(dw9719);
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if (ret)
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goto err_powerdown;
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pm_runtime_set_active(&client->dev);
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pm_runtime_get_noresume(&client->dev);
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pm_runtime_enable(&client->dev);
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ret = v4l2_async_register_subdev(&dw9719->sd);
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if (ret < 0)
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goto err_pm_runtime;
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pm_runtime_set_autosuspend_delay(&client->dev, 1000);
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pm_runtime_use_autosuspend(&client->dev);
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pm_runtime_put_autosuspend(&client->dev);
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return ret;
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err_pm_runtime:
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pm_runtime_disable(&client->dev);
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pm_runtime_put_noidle(&client->dev);
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err_powerdown:
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dw9719_power_down(dw9719);
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err_cleanup_media:
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media_entity_cleanup(&dw9719->sd.entity);
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err_free_ctrl_handler:
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v4l2_ctrl_handler_free(&dw9719->ctrls.handler);
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return ret;
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}
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static void dw9719_remove(struct i2c_client *client)
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{
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struct v4l2_subdev *sd = i2c_get_clientdata(client);
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struct dw9719_device *dw9719 =
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container_of(sd, struct dw9719_device, sd);
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v4l2_async_unregister_subdev(sd);
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v4l2_ctrl_handler_free(&dw9719->ctrls.handler);
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media_entity_cleanup(&dw9719->sd.entity);
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pm_runtime_disable(&client->dev);
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if (!pm_runtime_status_suspended(&client->dev))
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dw9719_power_down(dw9719);
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pm_runtime_set_suspended(&client->dev);
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}
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static const struct i2c_device_id dw9719_id_table[] = {
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{ "dw9719" },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, dw9719_id_table);
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static DEFINE_RUNTIME_DEV_PM_OPS(dw9719_pm_ops, dw9719_suspend, dw9719_resume,
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NULL);
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static struct i2c_driver dw9719_i2c_driver = {
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.driver = {
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.name = "dw9719",
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.pm = pm_sleep_ptr(&dw9719_pm_ops),
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},
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.probe = dw9719_probe,
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.remove = dw9719_remove,
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.id_table = dw9719_id_table,
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};
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module_i2c_driver(dw9719_i2c_driver);
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MODULE_AUTHOR("Daniel Scally <djrscally@gmail.com>");
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MODULE_DESCRIPTION("DW9719 VCM Driver");
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MODULE_LICENSE("GPL");
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