From patchwork Thu Sep 5 07:21:42 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dongchun Zhu X-Patchwork-Id: 58574 Received: from vger.kernel.org ([209.132.180.67]) by www.linuxtv.org with esmtp (Exim 4.84_2) (envelope-from ) id 1i5m5r-00073x-4z; Thu, 05 Sep 2019 07:22:11 +0000 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731951AbfIEHWJ (ORCPT + 1 other); Thu, 5 Sep 2019 03:22:09 -0400 Received: from mailgw02.mediatek.com ([210.61.82.184]:39472 "EHLO mailgw02.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1730778AbfIEHWJ (ORCPT ); Thu, 5 Sep 2019 03:22:09 -0400 X-UUID: a9710492a62f4a8fb75fdeab93f96c7c-20190905 X-UUID: a9710492a62f4a8fb75fdeab93f96c7c-20190905 Received: from mtkmrs01.mediatek.inc [(172.21.131.159)] by mailgw02.mediatek.com (envelope-from ) (Cellopoint E-mail Firewall v4.1.10 Build 0809 with TLS) with ESMTP id 684319468; Thu, 05 Sep 2019 15:22:01 +0800 Received: from mtkcas08.mediatek.inc (172.21.101.126) by mtkmbs07n2.mediatek.inc (172.21.101.141) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Thu, 5 Sep 2019 15:21:58 +0800 Received: from localhost.localdomain (10.17.3.153) by mtkcas08.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1395.4 via Frontend Transport; Thu, 5 Sep 2019 15:21:57 +0800 From: To: , , , , , , , , CC: , , , , , , , , Subject: [V2, 2/2] media: i2c: Add DW9768 VCM driver Date: Thu, 5 Sep 2019 15:21:42 +0800 Message-ID: <20190905072142.14606-3-dongchun.zhu@mediatek.com> X-Mailer: git-send-email 2.9.2 In-Reply-To: <20190905072142.14606-1-dongchun.zhu@mediatek.com> References: <20190905072142.14606-1-dongchun.zhu@mediatek.com> MIME-Version: 1.0 X-MTK: N Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org From: Dongchun Zhu This patch adds a V4L2 sub-device driver for DW9768 lens voice coil, and provides control to set the desired focus. The DW9768 is a 10 bit DAC with 100mA output current sink capability from Dongwoon, designed for linear control of voice coil motor, and controlled via I2C serial interface. Signed-off-by: Dongchun Zhu --- MAINTAINERS | 1 + drivers/media/i2c/Kconfig | 10 ++ drivers/media/i2c/Makefile | 1 + drivers/media/i2c/dw9768.c | 349 +++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 361 insertions(+) create mode 100644 drivers/media/i2c/dw9768.c diff --git a/MAINTAINERS b/MAINTAINERS index 192a671..c5c9a0e 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -4976,6 +4976,7 @@ M: Dongchun Zhu L: linux-media@vger.kernel.org T: git git://linuxtv.org/media_tree.git S: Maintained +F: drivers/media/i2c/dw9768.c F: Documentation/devicetree/bindings/media/i2c/dongwoon,dw9768.txt DONGWOON DW9807 LENS VOICE COIL DRIVER diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig index 79ce9ec..dfb665c 100644 --- a/drivers/media/i2c/Kconfig +++ b/drivers/media/i2c/Kconfig @@ -1016,6 +1016,16 @@ config VIDEO_DW9714 capability. This is designed for linear control of voice coil motors, controlled via I2C serial interface. +config VIDEO_DW9768 + tristate "DW9768 lens voice coil support" + depends on I2C && VIDEO_V4L2 && MEDIA_CONTROLLER + depends on VIDEO_V4L2_SUBDEV_API + help + This is a driver for the DW9768 camera lens voice coil. + DW9768 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_DW9807_VCM tristate "DW9807 lens voice coil support" depends on I2C && VIDEO_V4L2 && MEDIA_CONTROLLER diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile index fd4ea86..2561239 100644 --- a/drivers/media/i2c/Makefile +++ b/drivers/media/i2c/Makefile @@ -24,6 +24,7 @@ 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-$(CONFIG_VIDEO_DW9768) += dw9768.o obj-$(CONFIG_VIDEO_DW9807_VCM) += dw9807-vcm.o obj-$(CONFIG_VIDEO_ADV7170) += adv7170.o obj-$(CONFIG_VIDEO_ADV7175) += adv7175.o diff --git a/drivers/media/i2c/dw9768.c b/drivers/media/i2c/dw9768.c new file mode 100644 index 0000000..66d1712 --- /dev/null +++ b/drivers/media/i2c/dw9768.c @@ -0,0 +1,349 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (c) 2019 MediaTek Inc. + +#include +#include +#include +#include +#include +#include +#include +#include + +#define DW9768_NAME "dw9768" +#define DW9768_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 DW9768_FOCUS_STEPS 1 +/* + * DW9768 separates two registers to control the VCM position. + * One for MSB value, another is LSB value. + */ +#define DW9768_REG_MASK_MSB 0x03 +#define DW9768_REG_MASK_LSB 0xff +#define DW9768_SET_POSITION_ADDR 0x03 + +#define DW9768_CMD_DELAY 0xff +#define DW9768_CTRL_DELAY_US 5000 + +#define DW9768_DAC_SHIFT 8 + +/* dw9768 device structure */ +struct dw9768 { + struct v4l2_ctrl_handler ctrls; + struct v4l2_subdev sd; + struct regulator *vin; + struct regulator *vdd; +}; + +static inline struct dw9768 *to_dw9768_vcm(struct v4l2_ctrl *ctrl) +{ + return container_of(ctrl->handler, struct dw9768, ctrls); +} + +static inline struct dw9768 *sd_to_dw9768_vcm(struct v4l2_subdev *subdev) +{ + return container_of(subdev, struct dw9768, sd); +} + +struct regval_list { + unsigned char reg_num; + unsigned char value; +}; + +static struct regval_list dw9768_init_regs[] = { + {0x02, 0x02}, + {DW9768_CMD_DELAY, DW9768_CMD_DELAY}, + {0x06, 0x41}, + {0x07, 0x39}, + {DW9768_CMD_DELAY, DW9768_CMD_DELAY}, +}; + +static struct regval_list dw9768_release_regs[] = { + {0x02, 0x00}, + {DW9768_CMD_DELAY, DW9768_CMD_DELAY}, + {0x01, 0x00}, + {DW9768_CMD_DELAY, DW9768_CMD_DELAY}, +}; + +static int dw9768_write_smbus(struct dw9768 *dw9768, unsigned char reg, + unsigned char value) +{ + struct i2c_client *client = v4l2_get_subdevdata(&dw9768->sd); + int ret; + + if (reg == DW9768_CMD_DELAY && value == DW9768_CMD_DELAY) + usleep_range(DW9768_CTRL_DELAY_US, + DW9768_CTRL_DELAY_US + 100); + else + ret = i2c_smbus_write_byte_data(client, reg, value); + return ret; +} + +static int dw9768_write_array(struct dw9768 *dw9768, struct regval_list *vals, + u32 len) +{ + unsigned int i; + int ret; + + for (i = 0; i < len; i++) { + ret = dw9768_write_smbus(dw9768, vals->reg_num, vals->value); + if (ret < 0) + return ret; + } + return 0; +} + +static int dw9768_set_position(struct dw9768 *dw9768, u16 val) +{ + struct i2c_client *client = v4l2_get_subdevdata(&dw9768->sd); + u8 addr[2]; + + addr[0] = (val >> DW9768_DAC_SHIFT) & DW9768_REG_MASK_MSB; + addr[1] = val & DW9768_REG_MASK_LSB; + + return i2c_smbus_write_block_data(client, DW9768_SET_POSITION_ADDR, + ARRAY_SIZE(addr), addr); +} + +static int dw9768_release(struct dw9768 *dw9768) +{ + return dw9768_write_array(dw9768, dw9768_release_regs, + ARRAY_SIZE(dw9768_release_regs)); +} + +static int dw9768_init(struct dw9768 *dw9768) +{ + return dw9768_write_array(dw9768, dw9768_init_regs, + ARRAY_SIZE(dw9768_init_regs)); +} + +/* Power handling */ +static int dw9768_power_off(struct dw9768 *dw9768) +{ + struct i2c_client *client = v4l2_get_subdevdata(&dw9768->sd); + int ret; + + ret = dw9768_release(dw9768); + if (ret) + dev_err(&client->dev, "dw9768 release failed!\n"); + + ret = regulator_disable(dw9768->vin); + if (ret) + return ret; + + return regulator_disable(dw9768->vdd); +} + +static int dw9768_power_on(struct dw9768 *dw9768) +{ + int ret; + + ret = regulator_enable(dw9768->vin); + if (ret < 0) + return ret; + + ret = regulator_enable(dw9768->vdd); + if (ret < 0) + return ret; + + ret = dw9768_init(dw9768); + if (ret < 0) + goto fail; + + return 0; + +fail: + regulator_disable(dw9768->vin); + regulator_disable(dw9768->vdd); + + return ret; +} + +static int dw9768_set_ctrl(struct v4l2_ctrl *ctrl) +{ + struct dw9768 *dw9768 = to_dw9768_vcm(ctrl); + + if (ctrl->id == V4L2_CID_FOCUS_ABSOLUTE) + return dw9768_set_position(dw9768, ctrl->val); + + return 0; +} + +static const struct v4l2_ctrl_ops dw9768_vcm_ctrl_ops = { + .s_ctrl = dw9768_set_ctrl, +}; + +static int dw9768_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh) +{ + int ret; + + ret = pm_runtime_get_sync(sd->dev); + if (ret < 0) { + pm_runtime_put_noidle(sd->dev); + return ret; + } + + return 0; +} + +static int dw9768_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh) +{ + pm_runtime_put(sd->dev); + + return 0; +} + +static const struct v4l2_subdev_internal_ops dw9768_int_ops = { + .open = dw9768_open, + .close = dw9768_close, +}; + +static const struct v4l2_subdev_ops dw9768_ops = { }; + +static void dw9768_subdev_cleanup(struct dw9768 *dw9768) +{ + v4l2_async_unregister_subdev(&dw9768->sd); + v4l2_ctrl_handler_free(&dw9768->ctrls); + media_entity_cleanup(&dw9768->sd.entity); +} + +static int dw9768_init_controls(struct dw9768 *dw9768) +{ + struct v4l2_ctrl_handler *hdl = &dw9768->ctrls; + const struct v4l2_ctrl_ops *ops = &dw9768_vcm_ctrl_ops; + + v4l2_ctrl_handler_init(hdl, 1); + + v4l2_ctrl_new_std(hdl, ops, V4L2_CID_FOCUS_ABSOLUTE, + 0, DW9768_MAX_FOCUS_POS, DW9768_FOCUS_STEPS, 0); + + if (hdl->error) + return hdl->error; + + dw9768->sd.ctrl_handler = hdl; + + return 0; +} + +static int dw9768_probe(struct i2c_client *client) +{ + struct device *dev = &client->dev; + struct dw9768 *dw9768; + int ret; + + dw9768 = devm_kzalloc(dev, sizeof(*dw9768), GFP_KERNEL); + if (!dw9768) + return -ENOMEM; + + dw9768->vin = devm_regulator_get(dev, "vin"); + if (IS_ERR(dw9768->vin)) { + ret = PTR_ERR(dw9768->vin); + if (ret != -EPROBE_DEFER) + dev_err(dev, "cannot get vin regulator\n"); + return ret; + } + + dw9768->vdd = devm_regulator_get(dev, "vdd"); + if (IS_ERR(dw9768->vdd)) { + ret = PTR_ERR(dw9768->vdd); + if (ret != -EPROBE_DEFER) + dev_err(dev, "cannot get vdd regulator\n"); + return ret; + } + + v4l2_i2c_subdev_init(&dw9768->sd, client, &dw9768_ops); + dw9768->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE; + dw9768->sd.internal_ops = &dw9768_int_ops; + + ret = dw9768_init_controls(dw9768); + if (ret) + goto err_cleanup; + + ret = media_entity_pads_init(&dw9768->sd.entity, 0, NULL); + if (ret < 0) + goto err_cleanup; + + dw9768->sd.entity.function = MEDIA_ENT_F_LENS; + + ret = v4l2_async_register_subdev(&dw9768->sd); + if (ret < 0) + goto err_cleanup; + + pm_runtime_enable(dev); + + return 0; + +err_cleanup: + dw9768_subdev_cleanup(dw9768); + return ret; +} + +static int dw9768_remove(struct i2c_client *client) +{ + struct v4l2_subdev *sd = i2c_get_clientdata(client); + struct dw9768 *dw9768 = sd_to_dw9768_vcm(sd); + + dw9768_subdev_cleanup(dw9768); + pm_runtime_disable(&client->dev); + if (!pm_runtime_status_suspended(&client->dev)) + dw9768_power_off(dw9768); + pm_runtime_set_suspended(&client->dev); + + return 0; +} + +static int __maybe_unused dw9768_vcm_suspend(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct v4l2_subdev *sd = i2c_get_clientdata(client); + struct dw9768 *dw9768 = sd_to_dw9768_vcm(sd); + + return dw9768_power_off(dw9768); +} + +static int __maybe_unused dw9768_vcm_resume(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct v4l2_subdev *sd = i2c_get_clientdata(client); + struct dw9768 *dw9768 = sd_to_dw9768_vcm(sd); + + return dw9768_power_on(dw9768); +} + +static const struct i2c_device_id dw9768_id_table[] = { + { DW9768_NAME, 0 }, + { }, +}; +MODULE_DEVICE_TABLE(i2c, dw9768_id_table); + +static const struct of_device_id dw9768_of_table[] = { + { .compatible = "dongwoon,dw9768" }, + { }, +}; +MODULE_DEVICE_TABLE(of, dw9768_of_table); + +static const struct dev_pm_ops dw9768_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, + pm_runtime_force_resume) + SET_RUNTIME_PM_OPS(dw9768_vcm_suspend, dw9768_vcm_resume, NULL) +}; + +static struct i2c_driver dw9768_i2c_driver = { + .driver = { + .name = DW9768_NAME, + .pm = &dw9768_pm_ops, + .of_match_table = dw9768_of_table, + }, + .probe_new = dw9768_probe, + .remove = dw9768_remove, + .id_table = dw9768_id_table, +}; + +module_i2c_driver(dw9768_i2c_driver); + +MODULE_AUTHOR("Dongchun Zhu "); +MODULE_DESCRIPTION("DW9768 VCM driver"); +MODULE_LICENSE("GPL v2");