From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mga07.intel.com ([134.134.136.100]:50822 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753237AbdEHOni (ORCPT ); Mon, 8 May 2017 10:43:38 -0400 From: Rajmohan Mani To: linux-media@vger.kernel.org, mchehab@kernel.org, hverkuil@xs4all.nl Cc: Rajmohan Mani Subject: [PATCH v2] dw9714: Initial driver for dw9714 VCM Date: Mon, 8 May 2017 07:36:48 -0700 Message-Id: <1494254208-30045-1-git-send-email-rajmohan.mani@intel.com> Sender: linux-media-owner@vger.kernel.org List-ID: 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. Signed-off-by: Rajmohan Mani --- Changes in v2: - Addressed review comments from Hans Verkuil - Fixed a debug message typo - Got rid of a return variable --- drivers/media/i2c/Kconfig | 9 ++ drivers/media/i2c/Makefile | 1 + drivers/media/i2c/dw9714.c | 320 +++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 330 insertions(+) create mode 100644 drivers/media/i2c/dw9714.c diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig index fd181c9..4f0a7ad 100644 --- a/drivers/media/i2c/Kconfig +++ b/drivers/media/i2c/Kconfig @@ -300,6 +300,15 @@ 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 + ---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 diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile index 62323ec..987bd1f 100644 --- a/drivers/media/i2c/Makefile +++ b/drivers/media/i2c/Makefile @@ -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 index 0000000..cd6cde7 --- /dev/null +++ b/drivers/media/i2c/dw9714.c @@ -0,0 +1,320 @@ +/* + * 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 +#include +#include +#include +#include +#include +#include + +#define DW9714_NAME "dw9714" +#define DW9714_MAX_FOCUS_POS 1023 +#define DW9714_CTRL_STEPS 16 /* Keep this value power of 2 */ +#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) (u16)((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; +}; + +#define to_dw9714_vcm(_ctrl) \ + container_of(_ctrl->handler, struct dw9714_device, ctrls_vcm) + +static int dw9714_i2c_write(struct i2c_client *client, u16 data) +{ + const int num_msg = 1; + int ret; + u16 val = cpu_to_be16(data); + struct i2c_msg msg = { + .addr = client->addr, + .flags = 0, + .len = sizeof(val), + .buf = (u8 *) &val, + }; + + ret = i2c_transfer(client->adapter, &msg, num_msg); + + /*One retry */ + if (ret != num_msg) + ret = i2c_transfer(client->adapter, &msg, num_msg); + + if (ret != num_msg) { + 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; + + dev_dbg(&client->dev, "Setting new value VCM: %d\n", val); + 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_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, 1, 0); + + if (hdl->error) + dev_err(&client->dev, "dw9714_init_controls fail\n"); + dev_vcm->sd.ctrl_handler = hdl; + return hdl->error; +} + +static void dw9714_subdev_cleanup(struct dw9714_device *dw9714_dev) +{ + v4l2_ctrl_handler_free(&dw9714_dev->ctrls_vcm); + v4l2_async_unregister_subdev(&dw9714_dev->sd); + v4l2_device_unregister_subdev(&dw9714_dev->sd); + media_entity_cleanup(&dw9714_dev->sd.entity); +} + +static int dw9714_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh) +{ + struct dw9714_device *dw9714_dev = container_of(sd, + struct dw9714_device, + sd); + struct device *dev = &dw9714_dev->client->dev; + + return pm_runtime_get_sync(dev); +} + +static int dw9714_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh) +{ + struct dw9714_device *dw9714_dev = container_of(sd, + struct dw9714_device, + 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 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_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 = container_of(sd, + struct dw9714_device, + sd); + + pm_runtime_disable(&client->dev); + dw9714_subdev_cleanup(dw9714_dev); + + return 0; +} + +#ifdef CONFIG_PM + +static int dw9714_runtime_suspend(struct device *dev) +{ + return 0; +} + +static int dw9714_runtime_resume(struct device *dev) +{ + return 0; +} + +/* This function sets the vcm position, so it consumes least current */ +static int dw9714_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 = container_of(sd, + struct dw9714_device, + sd); + int ret, val; + + dev_dbg(dev, "%s\n", __func__); + + for (val = dw9714_dev->current_val & ~(DW9714_CTRL_STEPS - 1); + val >= 0; val -= DW9714_CTRL_STEPS) { + ret = dw9714_i2c_write(client, + DW9714_VAL((u16) val, DW9714_DEFAULT_S)); + if (ret) + dev_err(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, so the focus position is set + * closer to the camera + */ +static int dw9714_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 = container_of(sd, + struct dw9714_device, + sd); + int ret, val; + + dev_dbg(dev, "%s\n", __func__); + + 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((u16) val, DW9714_DEFAULT_S)); + if (ret) + dev_err(dev, "%s I2C failure: %d", __func__, ret); + usleep_range(DW9714_CTRL_DELAY_US, DW9714_CTRL_DELAY_US + 10); + } + + /* restore v4l2 control values */ + ret = v4l2_ctrl_handler_setup(&dw9714_dev->ctrls_vcm); + dev_dbg(dev, "%s ret = %d\n", __func__, ret); + return ret; +} + +#else + +#define dw9714_suspend NULL +#define dw9714_resume NULL +#define dw9714_runtime_suspend NULL +#define dw9714_runtime_resume NULL + +#endif /* CONFIG_PM */ + +#ifdef CONFIG_ACPI +static const struct acpi_device_id dw9714_acpi_match[] = { + {"DW9714", 0}, + {}, +}; +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 = { + .suspend = dw9714_suspend, + .resume = dw9714_resume, + .runtime_suspend = dw9714_runtime_suspend, + .runtime_resume = dw9714_runtime_resume, +}; + +static struct i2c_driver dw9714_i2c_driver = { + .driver = { + .name = DW9714_NAME, + .pm = &dw9714_pm_ops, +#ifdef CONFIG_ACPI + .acpi_match_table = ACPI_PTR(dw9714_acpi_match), +#endif + }, + .probe = dw9714_probe, + .remove = dw9714_remove, + .id_table = dw9714_id_table, +}; + +module_i2c_driver(dw9714_i2c_driver); + +MODULE_AUTHOR("Tianshu Qiu "); +MODULE_AUTHOR("Jian Xu Zheng "); +MODULE_AUTHOR("Yuning Pu "); +MODULE_AUTHOR("Jouni Ukkonen "); +MODULE_AUTHOR("Tommi Franttila "); +MODULE_DESCRIPTION("DW9714 VCM driver"); +MODULE_LICENSE("GPL"); -- 1.9.1