From patchwork Fri Mar 16 16:49:23 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Yeh, Andy" X-Patchwork-Id: 47977 Received: from vger.kernel.org ([209.132.180.67]) by www.linuxtv.org with esmtp (Exim 4.84_2) (envelope-from ) id 1ewsSu-0007hE-6E; Fri, 16 Mar 2018 16:44:24 +0000 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753363AbeCPQoV (ORCPT + 1 other); Fri, 16 Mar 2018 12:44:21 -0400 Received: from mga06.intel.com ([134.134.136.31]:8801 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753044AbeCPQoT (ORCPT ); Fri, 16 Mar 2018 12:44:19 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga007.jf.intel.com ([10.7.209.58]) by orsmga104.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 16 Mar 2018 09:44:19 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.48,316,1517904000"; d="scan'208";a="25299013" Received: from yehandy-ubuntu.itwn.intel.com ([10.5.230.30]) by orsmga007.jf.intel.com with ESMTP; 16 Mar 2018 09:44:18 -0700 From: Andy Yeh To: linux-media@vger.kernel.org Cc: sakari.ailus@linux.intel.com, andy.yeh@intel.com, Alan Chiang Subject: [v6 2/2] media: dw9807: Add dw9807 vcm driver Date: Sat, 17 Mar 2018 00:49:23 +0800 Message-Id: <1521218963-15163-3-git-send-email-andy.yeh@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1521218963-15163-1-git-send-email-andy.yeh@intel.com> References: <1521218963-15163-1-git-send-email-andy.yeh@intel.com> Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org From: Alan Chiang 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 --- 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 sicne v4: - sent patchset included DT binding with cover page MAINTAINERS | 7 + drivers/media/i2c/Kconfig | 10 ++ drivers/media/i2c/Makefile | 1 + drivers/media/i2c/dw9807.c | 320 +++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 338 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 +L: linux-media@vger.kernel.org +T: git git://linuxtv.org/media_tree.git +S: Maintained +F: drivers/media/i2c/dw9807.c + DOUBLETALK DRIVER M: "James R. Van Zandt" L: blinux-list@redhat.com 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..95626e9 --- /dev/null +++ b/drivers/media/i2c/dw9807.c @@ -0,0 +1,320 @@ +// Copyright (C) 2018 Intel Corporation +// SPDX-License-Identifier: GPL-2.0 + +#include +#include +#include +#include +#include +#include +#include + +#define DW9807_NAME "dw9807" +#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 = 0x1; + int ret; + + ret = i2c_master_send(client, (const char *)&status_addr, sizeof(status_addr)); + if (ret != sizeof(status_addr)) { + dev_err(&client->dev, "I2C write STATUS address fail ret = %d\n", + ret); + return -EIO; + } + + 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 -EIO; + } + + 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 (dw9807_i2c_check(client) != 0) { + 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)) { + dev_err(&client->dev, "I2C write MSB fail\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 == NULL) + 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_NAME, + .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 "); +MODULE_DESCRIPTION("DW9807 VCM driver"); +MODULE_LICENSE("GPL v2");