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Release 4.14 drivers/extcon/extcon-usbc-cros-ec.c

Directory: drivers/extcon
/**
 * drivers/extcon/extcon-usbc-cros-ec - ChromeOS Embedded Controller extcon
 *
 * Copyright (C) 2017 Google, Inc
 * Author: Benson Leung <bleung@chromium.org>
 *
 * 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); if (!msg) return -ENOMEM; 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; }

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/** * 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; }

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/** * 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; }

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/** * 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; }

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/** * 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; }

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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; }

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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; }

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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; }

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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; }

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#ifdef CONFIG_PM_SLEEP
static int extcon_cros_ec_suspend(struct device *dev) { return 0; }

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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; }

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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@chromium.org>"); MODULE_LICENSE("GPL");

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Directory: drivers/extcon
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