Hi,
On 2017년 07월 17일 17:54, Chanwoo Choi wrote:
> Hi Enric,
>
> When I tried to apply this patch, error happened as following:
> (based on v4.13-rc1)
>
> Applying: extcon: cros-ec: Add extcon-cros-ec driver to support display out.
> error: patch failed: include/linux/mfd/cros_ec_commands.h:285
> error: include/linux/mfd/cros_ec_commands.h: patch does not apply
>
> Is it based on v4.13-rc1?
Merge conflict is related to following issue:
$ cat include/linux/mfd/cros_ec_commands.h.rej
--- include/linux/mfd/cros_ec_commands.h
+++ include/linux/mfd/cros_ec_commands.h
@@ -285,10 +285,15 @@
EC_HOST_EVENT_HANG_DETECT = 20,
/* Hang detect logic detected a hang and warm rebooted the AP */
EC_HOST_EVENT_HANG_REBOOT = 21,
+ /* PD MCU triggering host event */
+ EC_HOST_EVENT_PD_MCU = 22,
/* EC RTC event occurred */
EC_HOST_EVENT_RTC = 26,
+ /* EC desires to change state of host-controlled USB mux */
+ EC_HOST_EVENT_USB_MUX = 28,
+
/*
* The high bit of the event mask is not used as a host event code. If
* it reads back as set, then the entire event mask should be
>
>
> On 2017년 07월 17일 16:37, Enric Balletbo i Serra wrote:
>> From: Benson Leung <bleung@xxxxxxxxxxxx>
>>
>> This is the driver for the USB Type C cable detection mechanism
>> built into the ChromeOS Embedded Controller on systems that
>> have USB Type-C ports.
>>
>> At present, this allows for the presence of display out, but in
>> future, it may also be used to notify host and device type cables
>> and the presence of power.
>>
>> Signed-off-by: Benson Leung <bleung@xxxxxxxxxxxx>
>> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@xxxxxxxxxxxxx>
>> Acked-by: Chanwoo Choi <cw00.chio@xxxxxxxxxxx>
>> Acked-by: Lee Jones <lee.jones@xxxxxxxxxx>
>> ---
>> Changes since v2:
>> - Rebase on top of v4.13-rc1
>> Changes since v1:
>> Requested by Chanwoo Choi
>> - Rename files changing _ for -
>> - Remove the unneeded blank line on bottom of header.
>> - Remove kobject.h and cros_ec_commands.h includes.
>> - Remove the debug message as is not necessary.
>> - Use the tab for indentation instead of space for if sentence.
>> - Define each variable on different lines when the variables should be
>> initialized.
>> - Remove EXTCON_USB and EXTCON_USB_HOST as are not really used for now.
>> - Add one blank line to split out between state and property setting.
>> - Add the author information (header and module)
>>
>> Enric Balletbo
>> - As Rob suggested to rename the compatible name to something indicating that
>> is USB Type C related I also renamed the file names, extcon-cros-ec ->
>> extcon-usbc-cros-ec, I think it's more clear.
>>
>> drivers/extcon/Kconfig | 7 +
>> drivers/extcon/Makefile | 1 +
>> drivers/extcon/extcon-usbc-cros-ec.c | 415 +++++++++++++++++++++++++++++++++++
>> include/linux/mfd/cros_ec_commands.h | 75 +++++++
>> 4 files changed, 498 insertions(+)
>> create mode 100644 drivers/extcon/extcon-usbc-cros-ec.c
>>
>> diff --git a/drivers/extcon/Kconfig b/drivers/extcon/Kconfig
>> index 6d50071..a7bca42 100644
>> --- a/drivers/extcon/Kconfig
>> +++ b/drivers/extcon/Kconfig
>> @@ -150,4 +150,11 @@ config EXTCON_USB_GPIO
>> Say Y here to enable GPIO based USB cable detection extcon support.
>> Used typically if GPIO is used for USB ID pin detection.
>>
>> +config EXTCON_USBC_CROS_EC
>> + tristate "ChromeOS Embedded Controller EXTCON support"
>> + depends on MFD_CROS_EC
>> + help
>> + Say Y here to enable USB Type C cable detection extcon support when
>> + using Chrome OS EC based USB Type-C ports.
>> +
>> endif
>> diff --git a/drivers/extcon/Makefile b/drivers/extcon/Makefile
>> index ecfa958..a73624e 100644
>> --- a/drivers/extcon/Makefile
>> +++ b/drivers/extcon/Makefile
>> @@ -20,3 +20,4 @@ obj-$(CONFIG_EXTCON_QCOM_SPMI_MISC) += extcon-qcom-spmi-misc.o
>> obj-$(CONFIG_EXTCON_RT8973A) += extcon-rt8973a.o
>> obj-$(CONFIG_EXTCON_SM5502) += extcon-sm5502.o
>> obj-$(CONFIG_EXTCON_USB_GPIO) += extcon-usb-gpio.o
>> +obj-$(CONFIG_EXTCON_USBC_CROS_EC) += extcon-usbc-cros-ec.o
>> diff --git a/drivers/extcon/extcon-usbc-cros-ec.c b/drivers/extcon/extcon-usbc-cros-ec.c
>> new file mode 100644
>> index 0000000..e759ed4
>> --- /dev/null
>> +++ b/drivers/extcon/extcon-usbc-cros-ec.c
>> @@ -0,0 +1,415 @@
>> +/**
>> + * drivers/extcon/extcon-usbc-cros-ec - ChromeOS Embedded Controller extcon
>> + *
>> + * Copyright (C) 2017 Google, Inc
>> + * Author: Benson Leung <bleung@xxxxxxxxxxxx>
>> + *
>> + * This software is licensed under the terms of the GNU General Public
>> + * License version 2, as published by the Free Software Foundation, and
>> + * may be copied, distributed, and modified under those terms.
>> + *
>> + * 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/extcon.h>
>> +#include <linux/kernel.h>
>> +#include <linux/mfd/cros_ec.h>
>> +#include <linux/module.h>
>> +#include <linux/notifier.h>
>> +#include <linux/of.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/slab.h>
>> +#include <linux/sched.h>
>> +
>> +struct cros_ec_extcon_info {
>> + struct device *dev;
>> + struct extcon_dev *edev;
>> +
>> + int port_id;
>> +
>> + struct cros_ec_device *ec;
>> +
>> + struct notifier_block notifier;
>> +
>> + bool dp; /* DisplayPort enabled */
>> + bool mux; /* SuperSpeed (usb3) enabled */
>> + unsigned int power_type;
>> +};
>> +
>> +static const unsigned int usb_type_c_cable[] = {
>> + EXTCON_DISP_DP,
>> + EXTCON_NONE,
>> +};
>> +
>> +/**
>> + * cros_ec_pd_command() - Send a command to the EC.
>> + * @info: pointer to struct cros_ec_extcon_info
>> + * @command: EC command
>> + * @version: EC command version
>> + * @outdata: EC command output data
>> + * @outsize: Size of outdata
>> + * @indata: EC command input data
>> + * @insize: Size of indata
>> + *
>> + * Return: 0 on success, <0 on failure.
>> + */
>> +static int cros_ec_pd_command(struct cros_ec_extcon_info *info,
>> + unsigned int command,
>> + unsigned int version,
>> + void *outdata,
>> + unsigned int outsize,
>> + void *indata,
>> + unsigned int insize)
>> +{
>> + struct cros_ec_command *msg;
>> + int ret;
>> +
>> + msg = kzalloc(sizeof(*msg) + max(outsize, insize), GFP_KERNEL);
>> +
>> + msg->version = version;
>> + msg->command = command;
>> + msg->outsize = outsize;
>> + msg->insize = insize;
>> +
>> + if (outsize)
>> + memcpy(msg->data, outdata, outsize);
>> +
>> + ret = cros_ec_cmd_xfer_status(info->ec, msg);
>> + if (ret >= 0 && insize)
>> + memcpy(indata, msg->data, insize);
>> +
>> + kfree(msg);
>> + return ret;
>> +}
>> +
>> +/**
>> + * cros_ec_usb_get_power_type() - Get power type info about PD device attached
>> + * to given port.
>> + * @info: pointer to struct cros_ec_extcon_info
>> + *
>> + * Return: power type on success, <0 on failure.
>> + */
>> +static int cros_ec_usb_get_power_type(struct cros_ec_extcon_info *info)
>> +{
>> + struct ec_params_usb_pd_power_info req;
>> + struct ec_response_usb_pd_power_info resp;
>> + int ret;
>> +
>> + req.port = info->port_id;
>> + ret = cros_ec_pd_command(info, EC_CMD_USB_PD_POWER_INFO, 0,
>> + &req, sizeof(req), &resp, sizeof(resp));
>> + if (ret < 0)
>> + return ret;
>> +
>> + return resp.type;
>> +}
>> +
>> +/**
>> + * cros_ec_usb_get_pd_mux_state() - Get PD mux state for given port.
>> + * @info: pointer to struct cros_ec_extcon_info
>> + *
>> + * Return: PD mux state on success, <0 on failure.
>> + */
>> +static int cros_ec_usb_get_pd_mux_state(struct cros_ec_extcon_info *info)
>> +{
>> + struct ec_params_usb_pd_mux_info req;
>> + struct ec_response_usb_pd_mux_info resp;
>> + int ret;
>> +
>> + req.port = info->port_id;
>> + ret = cros_ec_pd_command(info, EC_CMD_USB_PD_MUX_INFO, 0,
>> + &req, sizeof(req),
>> + &resp, sizeof(resp));
>> + if (ret < 0)
>> + return ret;
>> +
>> + return resp.flags;
>> +}
>> +
>> +/**
>> + * cros_ec_usb_get_role() - Get role info about possible PD device attached to a
>> + * given port.
>> + * @info: pointer to struct cros_ec_extcon_info
>> + * @polarity: pointer to cable polarity (return value)
>> + *
>> + * Return: role info on success, -ENOTCONN if no cable is connected, <0 on
>> + * failure.
>> + */
>> +static int cros_ec_usb_get_role(struct cros_ec_extcon_info *info,
>> + bool *polarity)
>> +{
>> + struct ec_params_usb_pd_control pd_control;
>> + struct ec_response_usb_pd_control_v1 resp;
>> + int ret;
>> +
>> + pd_control.port = info->port_id;
>> + pd_control.role = USB_PD_CTRL_ROLE_NO_CHANGE;
>> + pd_control.mux = USB_PD_CTRL_MUX_NO_CHANGE;
>> + ret = cros_ec_pd_command(info, EC_CMD_USB_PD_CONTROL, 1,
>> + &pd_control, sizeof(pd_control),
>> + &resp, sizeof(resp));
>> + if (ret < 0)
>> + return ret;
>> +
>> + if (!(resp.enabled & PD_CTRL_RESP_ENABLED_CONNECTED))
>> + return -ENOTCONN;
>> +
>> + *polarity = resp.polarity;
>> +
>> + return resp.role;
>> +}
>> +
>> +/**
>> + * cros_ec_pd_get_num_ports() - Get number of EC charge ports.
>> + * @info: pointer to struct cros_ec_extcon_info
>> + *
>> + * Return: number of ports on success, <0 on failure.
>> + */
>> +static int cros_ec_pd_get_num_ports(struct cros_ec_extcon_info *info)
>> +{
>> + struct ec_response_usb_pd_ports resp;
>> + int ret;
>> +
>> + ret = cros_ec_pd_command(info, EC_CMD_USB_PD_PORTS,
>> + 0, NULL, 0, &resp, sizeof(resp));
>> + if (ret < 0)
>> + return ret;
>> +
>> + return resp.num_ports;
>> +}
>> +
>> +static int extcon_cros_ec_detect_cable(struct cros_ec_extcon_info *info,
>> + bool force)
>> +{
>> + struct device *dev = info->dev;
>> + int role, power_type;
>> + bool polarity = false;
>> + bool dp = false;
>> + bool mux = false;
>> + bool hpd = false;
>> +
>> + power_type = cros_ec_usb_get_power_type(info);
>> + if (power_type < 0) {
>> + dev_err(dev, "failed getting power type err = %d\n",
>> + power_type);
>> + return power_type;
>> + }
>> +
>> + role = cros_ec_usb_get_role(info, &polarity);
>> + if (role < 0) {
>> + if (role != -ENOTCONN) {
>> + dev_err(dev, "failed getting role err = %d\n", role);
>> + return role;
>> + }
>> + } else {
>> + int pd_mux_state;
>> +
>> + pd_mux_state = cros_ec_usb_get_pd_mux_state(info);
>> + if (pd_mux_state < 0)
>> + pd_mux_state = USB_PD_MUX_USB_ENABLED;
>> +
>> + dp = pd_mux_state & USB_PD_MUX_DP_ENABLED;
>> + mux = pd_mux_state & USB_PD_MUX_USB_ENABLED;
>> + hpd = pd_mux_state & USB_PD_MUX_HPD_IRQ;
>> + }
>> +
>> + if (force || info->dp != dp || info->mux != mux ||
>> + info->power_type != power_type) {
>> +
>> + info->dp = dp;
>> + info->mux = mux;
>> + info->power_type = power_type;
>> +
>> + extcon_set_state(info->edev, EXTCON_DISP_DP, dp);
>> +
>> + extcon_set_property(info->edev, EXTCON_DISP_DP,
>> + EXTCON_PROP_USB_TYPEC_POLARITY,
>> + (union extcon_property_value)(int)polarity);
>> + extcon_set_property(info->edev, EXTCON_DISP_DP,
>> + EXTCON_PROP_USB_SS,
>> + (union extcon_property_value)(int)mux);
>> + extcon_set_property(info->edev, EXTCON_DISP_DP,
>> + EXTCON_PROP_DISP_HPD,
>> + (union extcon_property_value)(int)hpd);
>> +
>> + extcon_sync(info->edev, EXTCON_DISP_DP);
>> +
>> + } else if (hpd) {
>> + extcon_set_property(info->edev, EXTCON_DISP_DP,
>> + EXTCON_PROP_DISP_HPD,
>> + (union extcon_property_value)(int)hpd);
>> + extcon_sync(info->edev, EXTCON_DISP_DP);
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static int extcon_cros_ec_event(struct notifier_block *nb,
>> + unsigned long queued_during_suspend,
>> + void *_notify)
>> +{
>> + struct cros_ec_extcon_info *info;
>> + struct cros_ec_device *ec;
>> + u32 host_event;
>> +
>> + info = container_of(nb, struct cros_ec_extcon_info, notifier);
>> + ec = info->ec;
>> +
>> + host_event = cros_ec_get_host_event(ec);
>> + if (host_event & (EC_HOST_EVENT_MASK(EC_HOST_EVENT_PD_MCU) |
>> + EC_HOST_EVENT_MASK(EC_HOST_EVENT_USB_MUX))) {
>> + extcon_cros_ec_detect_cable(info, false);
>> + return NOTIFY_OK;
>> + }
>> +
>> + return NOTIFY_DONE;
>> +}
>> +
>> +static int extcon_cros_ec_probe(struct platform_device *pdev)
>> +{
>> + struct cros_ec_extcon_info *info;
>> + struct cros_ec_device *ec = dev_get_drvdata(pdev->dev.parent);
>> + struct device *dev = &pdev->dev;
>> + struct device_node *np = dev->of_node;
>> + int numports, ret;
>> +
>> + info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
>> + if (!info)
>> + return -ENOMEM;
>> +
>> + info->dev = dev;
>> + info->ec = ec;
>> +
>> + if (np) {
>> + u32 port;
>> +
>> + ret = of_property_read_u32(np, "google,usb-port-id", &port);
>> + if (ret < 0) {
>> + dev_err(dev, "Missing google,usb-port-id property\n");
>> + return ret;
>> + }
>> + info->port_id = port;
>> + } else {
>> + info->port_id = pdev->id;
>> + }
>> +
>> + numports = cros_ec_pd_get_num_ports(info);
>> + if (numports < 0) {
>> + dev_err(dev, "failed getting number of ports! ret = %d\n",
>> + numports);
>> + return numports;
>> + }
>> +
>> + if (info->port_id >= numports) {
>> + dev_err(dev, "This system only supports %d ports\n", numports);
>> + return -ENODEV;
>> + }
>> +
>> + info->edev = devm_extcon_dev_allocate(dev, usb_type_c_cable);
>> + if (IS_ERR(info->edev)) {
>> + dev_err(dev, "failed to allocate extcon device\n");
>> + return -ENOMEM;
>> + }
>> +
>> + ret = devm_extcon_dev_register(dev, info->edev);
>> + if (ret < 0) {
>> + dev_err(dev, "failed to register extcon device\n");
>> + return ret;
>> + }
>> +
>> + extcon_set_property_capability(info->edev, EXTCON_DISP_DP,
>> + EXTCON_PROP_USB_TYPEC_POLARITY);
>> + extcon_set_property_capability(info->edev, EXTCON_DISP_DP,
>> + EXTCON_PROP_USB_SS);
>> + extcon_set_property_capability(info->edev, EXTCON_DISP_DP,
>> + EXTCON_PROP_DISP_HPD);
>> +
>> + platform_set_drvdata(pdev, info);
>> +
>> + /* Get PD events from the EC */
>> + info->notifier.notifier_call = extcon_cros_ec_event;
>> + ret = blocking_notifier_chain_register(&info->ec->event_notifier,
>> + &info->notifier);
>> + if (ret < 0) {
>> + dev_err(dev, "failed to register notifier\n");
>> + return ret;
>> + }
>> +
>> + /* Perform initial detection */
>> + ret = extcon_cros_ec_detect_cable(info, true);
>> + if (ret < 0) {
>> + dev_err(dev, "failed to detect initial cable state\n");
>> + goto unregister_notifier;
>> + }
>> +
>> + return 0;
>> +
>> +unregister_notifier:
>> + blocking_notifier_chain_unregister(&info->ec->event_notifier,
>> + &info->notifier);
>> + return ret;
>> +}
>> +
>> +static int extcon_cros_ec_remove(struct platform_device *pdev)
>> +{
>> + struct cros_ec_extcon_info *info = platform_get_drvdata(pdev);
>> +
>> + blocking_notifier_chain_unregister(&info->ec->event_notifier,
>> + &info->notifier);
>> +
>> + return 0;
>> +}
>> +
>> +#ifdef CONFIG_PM_SLEEP
>> +static int extcon_cros_ec_suspend(struct device *dev)
>> +{
>> + return 0;
>> +}
>> +
>> +static int extcon_cros_ec_resume(struct device *dev)
>> +{
>> + int ret;
>> + struct cros_ec_extcon_info *info = dev_get_drvdata(dev);
>> +
>> + ret = extcon_cros_ec_detect_cable(info, true);
>> + if (ret < 0)
>> + dev_err(dev, "failed to detect cable state on resume\n");
>> +
>> + return 0;
>> +}
>> +
>> +static const struct dev_pm_ops extcon_cros_ec_dev_pm_ops = {
>> + SET_SYSTEM_SLEEP_PM_OPS(extcon_cros_ec_suspend, extcon_cros_ec_resume)
>> +};
>> +
>> +#define DEV_PM_OPS (&extcon_cros_ec_dev_pm_ops)
>> +#else
>> +#define DEV_PM_OPS NULL
>> +#endif /* CONFIG_PM_SLEEP */
>> +
>> +#ifdef CONFIG_OF
>> +static const struct of_device_id extcon_cros_ec_of_match[] = {
>> + { .compatible = "google,extcon-usbc-cros-ec" },
>> + { /* sentinel */ }
>> +};
>> +MODULE_DEVICE_TABLE(of, extcon_cros_ec_of_match);
>> +#endif /* CONFIG_OF */
>> +
>> +static struct platform_driver extcon_cros_ec_driver = {
>> + .driver = {
>> + .name = "extcon-usbc-cros-ec",
>> + .of_match_table = of_match_ptr(extcon_cros_ec_of_match),
>> + .pm = DEV_PM_OPS,
>> + },
>> + .remove = extcon_cros_ec_remove,
>> + .probe = extcon_cros_ec_probe,
>> +};
>> +
>> +module_platform_driver(extcon_cros_ec_driver);
>> +
>> +MODULE_DESCRIPTION("ChromeOS Embedded Controller extcon driver");
>> +MODULE_AUTHOR("Benson Leung <bleung@xxxxxxxxxxxx>");
>> +MODULE_LICENSE("GPL");
>> diff --git a/include/linux/mfd/cros_ec_commands.h b/include/linux/mfd/cros_ec_commands.h
>> index 26ef492..fdea68c 100644
>> --- a/include/linux/mfd/cros_ec_commands.h
>> +++ b/include/linux/mfd/cros_ec_commands.h
>> @@ -285,10 +285,15 @@ enum host_event_code {
>> EC_HOST_EVENT_HANG_DETECT = 20,
>> /* Hang detect logic detected a hang and warm rebooted the AP */
>> EC_HOST_EVENT_HANG_REBOOT = 21,
>> + /* PD MCU triggering host event */
>> + EC_HOST_EVENT_PD_MCU = 22,
>>
>> /* EC RTC event occurred */
>> EC_HOST_EVENT_RTC = 26,
>>
>> + /* EC desires to change state of host-controlled USB mux */
>> + EC_HOST_EVENT_USB_MUX = 28,
>> +
>> /*
>> * The high bit of the event mask is not used as a host event code. If
>> * it reads back as set, then the entire event mask should be
>> @@ -2913,6 +2918,76 @@ struct ec_params_usb_pd_control {
>> uint8_t mux;
>> } __packed;
>>
>> +#define PD_CTRL_RESP_ENABLED_COMMS (1 << 0) /* Communication enabled */
>> +#define PD_CTRL_RESP_ENABLED_CONNECTED (1 << 1) /* Device connected */
>> +#define PD_CTRL_RESP_ENABLED_PD_CAPABLE (1 << 2) /* Partner is PD capable */
>> +
>> +struct ec_response_usb_pd_control_v1 {
>> + uint8_t enabled;
>> + uint8_t role;
>> + uint8_t polarity;
>> + char state[32];
>> +} __packed;
>> +
>> +#define EC_CMD_USB_PD_PORTS 0x102
>> +
>> +struct ec_response_usb_pd_ports {
>> + uint8_t num_ports;
>> +} __packed;
>> +
>> +#define EC_CMD_USB_PD_POWER_INFO 0x103
>> +
>> +#define PD_POWER_CHARGING_PORT 0xff
>> +struct ec_params_usb_pd_power_info {
>> + uint8_t port;
>> +} __packed;
>> +
>> +enum usb_chg_type {
>> + USB_CHG_TYPE_NONE,
>> + USB_CHG_TYPE_PD,
>> + USB_CHG_TYPE_C,
>> + USB_CHG_TYPE_PROPRIETARY,
>> + USB_CHG_TYPE_BC12_DCP,
>> + USB_CHG_TYPE_BC12_CDP,
>> + USB_CHG_TYPE_BC12_SDP,
>> + USB_CHG_TYPE_OTHER,
>> + USB_CHG_TYPE_VBUS,
>> + USB_CHG_TYPE_UNKNOWN,
>> +};
>> +
>> +struct usb_chg_measures {
>> + uint16_t voltage_max;
>> + uint16_t voltage_now;
>> + uint16_t current_max;
>> + uint16_t current_lim;
>> +} __packed;
>> +
>> +struct ec_response_usb_pd_power_info {
>> + uint8_t role;
>> + uint8_t type;
>> + uint8_t dualrole;
>> + uint8_t reserved1;
>> + struct usb_chg_measures meas;
>> + uint32_t max_power;
>> +} __packed;
>> +
>> +/* Get info about USB-C SS muxes */
>> +#define EC_CMD_USB_PD_MUX_INFO 0x11a
>> +
>> +struct ec_params_usb_pd_mux_info {
>> + uint8_t port; /* USB-C port number */
>> +} __packed;
>> +
>> +/* Flags representing mux state */
>> +#define USB_PD_MUX_USB_ENABLED (1 << 0)
>> +#define USB_PD_MUX_DP_ENABLED (1 << 1)
>> +#define USB_PD_MUX_POLARITY_INVERTED (1 << 2)
>> +#define USB_PD_MUX_HPD_IRQ (1 << 3)
>> +
>> +struct ec_response_usb_pd_mux_info {
>> + uint8_t flags; /* USB_PD_MUX_*-encoded USB mux state */
>> +} __packed;
>> +
>> /*****************************************************************************/
>> /*
>> * Passthru commands
>>
>
>
--
Best Regards,
Chanwoo Choi
Samsung Electronics
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