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power: supply: add cros-ec USBPD charger driver. 

This driver gets various bits of information about what is connected to
USB PD ports from the EC and converts that into power_supply properties.

Signed-off-by: Sameer Nanda <snanda@chromium.org>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
This commit is contained in:
Sameer Nanda 2018-05-02 17:44:17 +02:00 committed by Sebastian Reichel
parent 0d08901ba8
commit f68b883e8f
3 changed files with 555 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/power/supply/Kconfig
View File

@ -624,4 +624,14 @@ config CHARGER_RT9455
help
Say Y to enable support for Richtek RT9455 battery charger.
config CHARGER_CROS_USBPD
tristate "ChromeOS EC based USBPD charger"
depends on MFD_CROS_EC
default n
help
Say Y here to enable ChromeOS EC based USBPD charger
driver. This driver gets various bits of information about
what is connected to USB PD ports from the EC and converts
that into power_supply properties.
endif # POWER_SUPPLY

1
drivers/power/supply/Makefile
View File

@ -83,3 +83,4 @@ obj-$(CONFIG_CHARGER_TPS65090) += tps65090-charger.o
obj-$(CONFIG_CHARGER_TPS65217) += tps65217_charger.o
obj-$(CONFIG_AXP288_FUEL_GAUGE) += axp288_fuel_gauge.o
obj-$(CONFIG_AXP288_CHARGER) += axp288_charger.o
obj-$(CONFIG_CHARGER_CROS_USBPD) += cros_usbpd-charger.o

544
drivers/power/supply/cros_usbpd-charger.c Normal file
View File

@ -0,0 +1,544 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* Power supply driver for ChromeOS EC based USB PD Charger.
*
* Copyright (c) 2014 - 2018 Google, Inc
*/
#include <linux/module.h>
#include <linux/mfd/cros_ec.h>
#include <linux/mfd/cros_ec_commands.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/slab.h>
#define CHARGER_DIR_NAME "CROS_USBPD_CHARGER%d"
#define CHARGER_DIR_NAME_LENGTH sizeof(CHARGER_DIR_NAME)
#define CHARGER_CACHE_UPDATE_DELAY msecs_to_jiffies(500)
#define CHARGER_MANUFACTURER_MODEL_LENGTH 32
#define DRV_NAME "cros-usbpd-charger"
struct port_data {
int port_number;
char name[CHARGER_DIR_NAME_LENGTH];
char manufacturer[CHARGER_MANUFACTURER_MODEL_LENGTH];
char model_name[CHARGER_MANUFACTURER_MODEL_LENGTH];
struct power_supply *psy;
struct power_supply_desc psy_desc;
int psy_usb_type;
int psy_online;
int psy_status;
int psy_current_max;
int psy_voltage_max_design;
int psy_voltage_now;
int psy_power_max;
struct charger_data *charger;
unsigned long last_update;
};
struct charger_data {
struct device *dev;
struct cros_ec_dev *ec_dev;
struct cros_ec_device *ec_device;
int num_charger_ports;
int num_registered_psy;
struct port_data *ports[EC_USB_PD_MAX_PORTS];
struct notifier_block notifier;
};
static enum power_supply_property cros_usbpd_charger_props[] = {
POWER_SUPPLY_PROP_ONLINE,
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_CURRENT_MAX,
POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_MODEL_NAME,
POWER_SUPPLY_PROP_MANUFACTURER,
POWER_SUPPLY_PROP_USB_TYPE
};
static enum power_supply_usb_type cros_usbpd_charger_usb_types[] = {
POWER_SUPPLY_USB_TYPE_UNKNOWN,
POWER_SUPPLY_USB_TYPE_SDP,
POWER_SUPPLY_USB_TYPE_DCP,
POWER_SUPPLY_USB_TYPE_CDP,
POWER_SUPPLY_USB_TYPE_C,
POWER_SUPPLY_USB_TYPE_PD,
POWER_SUPPLY_USB_TYPE_PD_DRP,
POWER_SUPPLY_USB_TYPE_APPLE_BRICK_ID
};
static int cros_usbpd_charger_ec_command(struct charger_data *charger,
unsigned int version,
unsigned int command,
void *outdata,
unsigned int outsize,
void *indata,
unsigned int insize)
{
struct cros_ec_dev *ec_dev = charger->ec_dev;
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 = ec_dev->cmd_offset + command;
msg->outsize = outsize;
msg->insize = insize;
if (outsize)
memcpy(msg->data, outdata, outsize);
ret = cros_ec_cmd_xfer_status(charger->ec_device, msg);
if (ret >= 0 && insize)
memcpy(indata, msg->data, insize);
kfree(msg);
return ret;
}
static int cros_usbpd_charger_get_num_ports(struct charger_data *charger)
{
struct ec_response_usb_pd_ports resp;
int ret;
ret = cros_usbpd_charger_ec_command(charger, 0, EC_CMD_USB_PD_PORTS,
NULL, 0, &resp, sizeof(resp));
if (ret < 0) {
dev_err(charger->dev,
"Unable to get the number or ports (err:0x%x)\n", ret);
return ret;
}
return resp.num_ports;
}
static int cros_usbpd_charger_get_discovery_info(struct port_data *port)
{
struct charger_data *charger = port->charger;
struct ec_params_usb_pd_discovery_entry resp;
struct ec_params_usb_pd_info_request req;
int ret;
req.port = port->port_number;
ret = cros_usbpd_charger_ec_command(charger, 0,
EC_CMD_USB_PD_DISCOVERY,
&req, sizeof(req),
&resp, sizeof(resp));
if (ret < 0) {
dev_err(charger->dev,
"Unable to query discovery info (err:0x%x)\n", ret);
return ret;
}
dev_dbg(charger->dev, "Port %d: VID = 0x%x, PID=0x%x, PTYPE=0x%x\n",
port->port_number, resp.vid, resp.pid, resp.ptype);
snprintf(port->manufacturer, sizeof(port->manufacturer), "%x",
resp.vid);
snprintf(port->model_name, sizeof(port->model_name), "%x", resp.pid);
return 0;
}
static int cros_usbpd_charger_get_power_info(struct port_data *port)
{
struct charger_data *charger = port->charger;
struct ec_response_usb_pd_power_info resp;
struct ec_params_usb_pd_power_info req;
int last_psy_status, last_psy_usb_type;
struct device *dev = charger->dev;
int ret;
req.port = port->port_number;
ret = cros_usbpd_charger_ec_command(charger, 0,
EC_CMD_USB_PD_POWER_INFO,
&req, sizeof(req),
&resp, sizeof(resp));
if (ret < 0) {
dev_err(dev, "Unable to query PD power info (err:0x%x)\n", ret);
return ret;
}
last_psy_status = port->psy_status;
last_psy_usb_type = port->psy_usb_type;
switch (resp.role) {
case USB_PD_PORT_POWER_DISCONNECTED:
port->psy_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
port->psy_online = 0;
break;
case USB_PD_PORT_POWER_SOURCE:
port->psy_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
port->psy_online = 0;
break;
case USB_PD_PORT_POWER_SINK:
port->psy_status = POWER_SUPPLY_STATUS_CHARGING;
port->psy_online = 1;
break;
case USB_PD_PORT_POWER_SINK_NOT_CHARGING:
port->psy_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
port->psy_online = 1;
break;
default:
dev_err(dev, "Unknown role %d\n", resp.role);
break;
}
port->psy_voltage_max_design = resp.meas.voltage_max;
port->psy_voltage_now = resp.meas.voltage_now;
port->psy_current_max = resp.meas.current_max;
port->psy_power_max = resp.max_power;
switch (resp.type) {
case USB_CHG_TYPE_BC12_SDP:
case USB_CHG_TYPE_VBUS:
port->psy_usb_type = POWER_SUPPLY_USB_TYPE_SDP;
break;
case USB_CHG_TYPE_NONE:
/*
* For dual-role devices when we are a source, the firmware
* reports the type as NONE. Report such chargers as type
* USB_PD_DRP.
*/
if (resp.role == USB_PD_PORT_POWER_SOURCE && resp.dualrole)
port->psy_usb_type = POWER_SUPPLY_USB_TYPE_PD_DRP;
else
port->psy_usb_type = POWER_SUPPLY_USB_TYPE_SDP;
break;
case USB_CHG_TYPE_OTHER:
case USB_CHG_TYPE_PROPRIETARY:
port->psy_usb_type = POWER_SUPPLY_USB_TYPE_APPLE_BRICK_ID;
break;
case USB_CHG_TYPE_C:
port->psy_usb_type = POWER_SUPPLY_USB_TYPE_C;
break;
case USB_CHG_TYPE_BC12_DCP:
port->psy_usb_type = POWER_SUPPLY_USB_TYPE_DCP;
break;
case USB_CHG_TYPE_BC12_CDP:
port->psy_usb_type = POWER_SUPPLY_USB_TYPE_CDP;
break;
case USB_CHG_TYPE_PD:
if (resp.dualrole)
port->psy_usb_type = POWER_SUPPLY_USB_TYPE_PD_DRP;
else
port->psy_usb_type = POWER_SUPPLY_USB_TYPE_PD;
break;
case USB_CHG_TYPE_UNKNOWN:
/*
* While the EC is trying to determine the type of charger that
* has been plugged in, it will report the charger type as
* unknown. Additionally since the power capabilities are
* unknown, report the max current and voltage as zero.
*/
port->psy_usb_type = POWER_SUPPLY_USB_TYPE_UNKNOWN;
port->psy_voltage_max_design = 0;
port->psy_current_max = 0;
break;
default:
dev_err(dev, "Port %d: default case!\n", port->port_number);
port->psy_usb_type = POWER_SUPPLY_USB_TYPE_SDP;
}
port->psy_desc.type = POWER_SUPPLY_TYPE_USB;
dev_dbg(dev,
"Port %d: type=%d vmax=%d vnow=%d cmax=%d clim=%d pmax=%d\n",
port->port_number, resp.type, resp.meas.voltage_max,
resp.meas.voltage_now, resp.meas.current_max,
resp.meas.current_lim, resp.max_power);
/*
* If power supply type or status changed, explicitly call
* power_supply_changed. This results in udev event getting generated
* and allows user mode apps to react quicker instead of waiting for
* their next poll of power supply status.
*/
if (last_psy_usb_type != port->psy_usb_type ||
last_psy_status != port->psy_status)
power_supply_changed(port->psy);
return 0;
}
static int cros_usbpd_charger_get_port_status(struct port_data *port,
bool ratelimit)
{
int ret;
if (ratelimit &&
time_is_after_jiffies(port->last_update +
CHARGER_CACHE_UPDATE_DELAY))
return 0;
ret = cros_usbpd_charger_get_power_info(port);
if (ret < 0)
return ret;
ret = cros_usbpd_charger_get_discovery_info(port);
port->last_update = jiffies;
return ret;
}
static void cros_usbpd_charger_power_changed(struct power_supply *psy)
{
struct port_data *port = power_supply_get_drvdata(psy);
struct charger_data *charger = port->charger;
int i;
for (i = 0; i < charger->num_registered_psy; i++)
cros_usbpd_charger_get_port_status(charger->ports[i], false);
}
static int cros_usbpd_charger_get_prop(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct port_data *port = power_supply_get_drvdata(psy);
struct charger_data *charger = port->charger;
struct cros_ec_device *ec_device = charger->ec_device;
struct device *dev = charger->dev;
int ret;
/* Only refresh ec_port_status for dynamic properties */
switch (psp) {
case POWER_SUPPLY_PROP_ONLINE:
/*
* If mkbp_event_supported, then we can be assured that
* the driver's state for the online property is consistent
* with the hardware. However, if we aren't event driven,
* the optimization before to skip an ec_port_status get
* and only returned cached values of the online property will
* cause a delay in detecting a cable attach until one of the
* other properties are read.
*
* Allow an ec_port_status refresh for online property check
* if we're not already online to check for plug events if
* not mkbp_event_supported.
*/
if (ec_device->mkbp_event_supported || port->psy_online)
break;
case POWER_SUPPLY_PROP_CURRENT_MAX:
case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
ret = cros_usbpd_charger_get_port_status(port, true);
if (ret < 0) {
dev_err(dev, "Failed to get port status (err:0x%x)\n",
ret);
return -EINVAL;
}
break;
default:
break;
}
switch (psp) {
case POWER_SUPPLY_PROP_ONLINE:
val->intval = port->psy_online;
break;
case POWER_SUPPLY_PROP_STATUS:
val->intval = port->psy_status;
break;
case POWER_SUPPLY_PROP_CURRENT_MAX:
val->intval = port->psy_current_max * 1000;
break;
case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
val->intval = port->psy_voltage_max_design * 1000;
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
val->intval = port->psy_voltage_now * 1000;
break;
case POWER_SUPPLY_PROP_USB_TYPE:
val->intval = port->psy_usb_type;
break;
case POWER_SUPPLY_PROP_MODEL_NAME:
val->strval = port->model_name;
break;
case POWER_SUPPLY_PROP_MANUFACTURER:
val->strval = port->manufacturer;
break;
default:
return -EINVAL;
}
return 0;
}
static int cros_usbpd_charger_ec_event(struct notifier_block *nb,
unsigned long queued_during_suspend,
void *_notify)
{
struct cros_ec_device *ec_device;
struct charger_data *charger;
struct device *dev;
u32 host_event;
charger = container_of(nb, struct charger_data, notifier);
ec_device = charger->ec_device;
dev = charger->dev;
host_event = cros_ec_get_host_event(ec_device);
if (host_event & EC_HOST_EVENT_MASK(EC_HOST_EVENT_PD_MCU)) {
cros_usbpd_charger_power_changed(charger->ports[0]->psy);
return NOTIFY_OK;
} else {
return NOTIFY_DONE;
}
}
static void cros_usbpd_charger_unregister_notifier(void *data)
{
struct charger_data *charger = data;
struct cros_ec_device *ec_device = charger->ec_device;
blocking_notifier_chain_unregister(&ec_device->event_notifier,
&charger->notifier);
}
static int cros_usbpd_charger_probe(struct platform_device *pd)
{
struct cros_ec_dev *ec_dev = dev_get_drvdata(pd->dev.parent);
struct cros_ec_device *ec_device = ec_dev->ec_dev;
struct power_supply_desc *psy_desc;
struct device *dev = &pd->dev;
struct charger_data *charger;
struct power_supply *psy;
struct port_data *port;
int ret = -EINVAL;
int i;
charger = devm_kzalloc(dev, sizeof(struct charger_data),
GFP_KERNEL);
if (!charger)
return -ENOMEM;
charger->dev = dev;
charger->ec_dev = ec_dev;
charger->ec_device = ec_device;
platform_set_drvdata(pd, charger);
charger->num_charger_ports = cros_usbpd_charger_get_num_ports(charger);
if (charger->num_charger_ports <= 0) {
/*
* This can happen on a system that doesn't support USB PD.
* Log a message, but no need to warn.
*/
dev_info(dev, "No charging ports found\n");
ret = -ENODEV;
goto fail_nowarn;
}
for (i = 0; i < charger->num_charger_ports; i++) {
struct power_supply_config psy_cfg = {};
port = devm_kzalloc(dev, sizeof(struct port_data), GFP_KERNEL);
if (!port) {
ret = -ENOMEM;
goto fail;
}
port->charger = charger;
port->port_number = i;
sprintf(port->name, CHARGER_DIR_NAME, i);
psy_desc = &port->psy_desc;
psy_desc->name = port->name;
psy_desc->type = POWER_SUPPLY_TYPE_USB;
psy_desc->get_property = cros_usbpd_charger_get_prop;
psy_desc->external_power_changed =
cros_usbpd_charger_power_changed;
psy_desc->properties = cros_usbpd_charger_props;
psy_desc->num_properties =
ARRAY_SIZE(cros_usbpd_charger_props);
psy_desc->usb_types = cros_usbpd_charger_usb_types;
psy_desc->num_usb_types =
ARRAY_SIZE(cros_usbpd_charger_usb_types);
psy_cfg.drv_data = port;
psy = devm_power_supply_register_no_ws(dev, psy_desc,
&psy_cfg);
if (IS_ERR(psy)) {
dev_err(dev, "Failed to register power supply\n");
continue;
}
port->psy = psy;
charger->ports[charger->num_registered_psy++] = port;
}
if (!charger->num_registered_psy) {
ret = -ENODEV;
dev_err(dev, "No power supplies registered\n");
goto fail;
}
if (ec_device->mkbp_event_supported) {
/* Get PD events from the EC */
charger->notifier.notifier_call = cros_usbpd_charger_ec_event;
ret = blocking_notifier_chain_register(
&ec_device->event_notifier,
&charger->notifier);
if (ret < 0) {
dev_warn(dev, "failed to register notifier\n");
} else {
ret = devm_add_action_or_reset(dev,
cros_usbpd_charger_unregister_notifier,
charger);
if (ret < 0)
goto fail;
}
}
return 0;
fail:
WARN(1, "%s: Failing probe (err:0x%x)\n", dev_name(dev), ret);
fail_nowarn:
dev_info(dev, "Failing probe (err:0x%x)\n", ret);
return ret;
}
#ifdef CONFIG_PM_SLEEP
static int cros_usbpd_charger_resume(struct device *dev)
{
struct charger_data *charger = dev_get_drvdata(dev);
int i;
if (!charger)
return 0;
for (i = 0; i < charger->num_registered_psy; i++) {
power_supply_changed(charger->ports[i]->psy);
charger->ports[i]->last_update =
jiffies - CHARGER_CACHE_UPDATE_DELAY;
}
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(cros_usbpd_charger_pm_ops, NULL,
cros_usbpd_charger_resume);
static struct platform_driver cros_usbpd_charger_driver = {
.driver = {
.name = DRV_NAME,
.pm = &cros_usbpd_charger_pm_ops,
},
.probe = cros_usbpd_charger_probe
};
module_platform_driver(cros_usbpd_charger_driver);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("ChromeOS EC USBPD charger");
MODULE_ALIAS("platform:" DRV_NAME);