249 lines
6.7 KiB
C
Executable file
249 lines
6.7 KiB
C
Executable file
/*
|
|
* Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
|
|
* Driver for chargers which report their online status through a GPIO pin
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the
|
|
* Free Software Foundation; either version 2 of the License, or (at your
|
|
* option) any later version.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*
|
|
*/
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/gpio.h> /* For legacy platform data */
|
|
#include <linux/init.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/power_supply.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/of.h>
|
|
#include <linux/gpio/consumer.h>
|
|
|
|
#include <linux/power/gpio-charger.h>
|
|
|
|
struct gpio_charger {
|
|
unsigned int irq;
|
|
bool wakeup_enabled;
|
|
|
|
struct power_supply *charger;
|
|
struct power_supply_desc charger_desc;
|
|
struct gpio_desc *gpiod;
|
|
};
|
|
|
|
static irqreturn_t gpio_charger_irq(int irq, void *devid)
|
|
{
|
|
struct power_supply *charger = devid;
|
|
|
|
power_supply_changed(charger);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static inline struct gpio_charger *psy_to_gpio_charger(struct power_supply *psy)
|
|
{
|
|
return power_supply_get_drvdata(psy);
|
|
}
|
|
|
|
static int gpio_charger_get_property(struct power_supply *psy,
|
|
enum power_supply_property psp, union power_supply_propval *val)
|
|
{
|
|
struct gpio_charger *gpio_charger = psy_to_gpio_charger(psy);
|
|
|
|
switch (psp) {
|
|
case POWER_SUPPLY_PROP_ONLINE:
|
|
val->intval = gpiod_get_value_cansleep(gpio_charger->gpiod);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static enum power_supply_type gpio_charger_get_type(struct device *dev)
|
|
{
|
|
const char *chargetype;
|
|
|
|
if (!device_property_read_string(dev, "charger-type", &chargetype)) {
|
|
if (!strcmp("unknown", chargetype))
|
|
return POWER_SUPPLY_TYPE_UNKNOWN;
|
|
if (!strcmp("battery", chargetype))
|
|
return POWER_SUPPLY_TYPE_BATTERY;
|
|
if (!strcmp("ups", chargetype))
|
|
return POWER_SUPPLY_TYPE_UPS;
|
|
if (!strcmp("mains", chargetype))
|
|
return POWER_SUPPLY_TYPE_MAINS;
|
|
if (!strcmp("usb-sdp", chargetype))
|
|
return POWER_SUPPLY_TYPE_USB;
|
|
if (!strcmp("usb-dcp", chargetype))
|
|
return POWER_SUPPLY_TYPE_USB_DCP;
|
|
if (!strcmp("usb-cdp", chargetype))
|
|
return POWER_SUPPLY_TYPE_USB_CDP;
|
|
if (!strcmp("usb-aca", chargetype))
|
|
return POWER_SUPPLY_TYPE_USB_ACA;
|
|
}
|
|
dev_warn(dev, "unknown charger type %s\n", chargetype);
|
|
|
|
return POWER_SUPPLY_TYPE_UNKNOWN;
|
|
}
|
|
|
|
static enum power_supply_property gpio_charger_properties[] = {
|
|
POWER_SUPPLY_PROP_ONLINE,
|
|
};
|
|
|
|
static int gpio_charger_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
const struct gpio_charger_platform_data *pdata = dev->platform_data;
|
|
struct power_supply_config psy_cfg = {};
|
|
struct gpio_charger *gpio_charger;
|
|
struct power_supply_desc *charger_desc;
|
|
unsigned long flags;
|
|
int irq, ret;
|
|
|
|
if (!pdata && !dev->of_node) {
|
|
dev_err(dev, "No platform data\n");
|
|
return -ENOENT;
|
|
}
|
|
|
|
gpio_charger = devm_kzalloc(dev, sizeof(*gpio_charger), GFP_KERNEL);
|
|
if (!gpio_charger)
|
|
return -ENOMEM;
|
|
|
|
/*
|
|
* This will fetch a GPIO descriptor from device tree, ACPI or
|
|
* boardfile descriptor tables. It's good to try this first.
|
|
*/
|
|
gpio_charger->gpiod = devm_gpiod_get(dev, NULL, GPIOD_IN);
|
|
|
|
/*
|
|
* If this fails and we're not using device tree, try the
|
|
* legacy platform data method.
|
|
*/
|
|
if (IS_ERR(gpio_charger->gpiod) && !dev->of_node) {
|
|
/* Non-DT: use legacy GPIO numbers */
|
|
if (!gpio_is_valid(pdata->gpio)) {
|
|
dev_err(dev, "Invalid gpio pin in pdata\n");
|
|
return -EINVAL;
|
|
}
|
|
flags = GPIOF_IN;
|
|
if (pdata->gpio_active_low)
|
|
flags |= GPIOF_ACTIVE_LOW;
|
|
ret = devm_gpio_request_one(dev, pdata->gpio, flags,
|
|
dev_name(dev));
|
|
if (ret) {
|
|
dev_err(dev, "Failed to request gpio pin: %d\n", ret);
|
|
return ret;
|
|
}
|
|
/* Then convert this to gpiod for now */
|
|
gpio_charger->gpiod = gpio_to_desc(pdata->gpio);
|
|
} else if (IS_ERR(gpio_charger->gpiod)) {
|
|
/* Just try again if this happens */
|
|
if (PTR_ERR(gpio_charger->gpiod) == -EPROBE_DEFER)
|
|
return -EPROBE_DEFER;
|
|
dev_err(dev, "error getting GPIO descriptor\n");
|
|
return PTR_ERR(gpio_charger->gpiod);
|
|
}
|
|
|
|
charger_desc = &gpio_charger->charger_desc;
|
|
charger_desc->properties = gpio_charger_properties;
|
|
charger_desc->num_properties = ARRAY_SIZE(gpio_charger_properties);
|
|
charger_desc->get_property = gpio_charger_get_property;
|
|
|
|
psy_cfg.of_node = dev->of_node;
|
|
psy_cfg.drv_data = gpio_charger;
|
|
|
|
if (pdata) {
|
|
charger_desc->name = pdata->name;
|
|
charger_desc->type = pdata->type;
|
|
psy_cfg.supplied_to = pdata->supplied_to;
|
|
psy_cfg.num_supplicants = pdata->num_supplicants;
|
|
} else {
|
|
charger_desc->name = dev->of_node->name;
|
|
charger_desc->type = gpio_charger_get_type(dev);
|
|
}
|
|
|
|
if (!charger_desc->name)
|
|
charger_desc->name = pdev->name;
|
|
|
|
gpio_charger->charger = devm_power_supply_register(dev, charger_desc,
|
|
&psy_cfg);
|
|
if (IS_ERR(gpio_charger->charger)) {
|
|
ret = PTR_ERR(gpio_charger->charger);
|
|
dev_err(dev, "Failed to register power supply: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
irq = gpiod_to_irq(gpio_charger->gpiod);
|
|
if (irq > 0) {
|
|
ret = devm_request_any_context_irq(dev, irq, gpio_charger_irq,
|
|
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
|
|
dev_name(dev), gpio_charger->charger);
|
|
if (ret < 0)
|
|
dev_warn(dev, "Failed to request irq: %d\n", ret);
|
|
else
|
|
gpio_charger->irq = irq;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, gpio_charger);
|
|
|
|
device_init_wakeup(dev, 1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int gpio_charger_suspend(struct device *dev)
|
|
{
|
|
struct gpio_charger *gpio_charger = dev_get_drvdata(dev);
|
|
|
|
if (device_may_wakeup(dev))
|
|
gpio_charger->wakeup_enabled =
|
|
!enable_irq_wake(gpio_charger->irq);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int gpio_charger_resume(struct device *dev)
|
|
{
|
|
struct gpio_charger *gpio_charger = dev_get_drvdata(dev);
|
|
|
|
if (device_may_wakeup(dev) && gpio_charger->wakeup_enabled)
|
|
disable_irq_wake(gpio_charger->irq);
|
|
power_supply_changed(gpio_charger->charger);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static SIMPLE_DEV_PM_OPS(gpio_charger_pm_ops,
|
|
gpio_charger_suspend, gpio_charger_resume);
|
|
|
|
static const struct of_device_id gpio_charger_match[] = {
|
|
{ .compatible = "gpio-charger" },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, gpio_charger_match);
|
|
|
|
static struct platform_driver gpio_charger_driver = {
|
|
.probe = gpio_charger_probe,
|
|
.driver = {
|
|
.name = "gpio-charger",
|
|
.pm = &gpio_charger_pm_ops,
|
|
.of_match_table = gpio_charger_match,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(gpio_charger_driver);
|
|
|
|
MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
|
|
MODULE_DESCRIPTION("Driver for chargers which report their online status through a GPIO");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:gpio-charger");
|