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power: supply: gpio-charger: change current limit automatically by *USB_DCP*

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The usb phy could update the state of the EXTCON_CHG_USB_DCP duly, so
that we can change the current limit to maximum within the USB dedicated
charging port.

Signed-off-by: Ziyuan Xu <xzy.xu@rock-chips.com>
Change-Id: I32f0361a2f0153424627bef0bd75c3b93e51ec03
This commit is contained in:
Ziyuan Xu
2020-11-12 17:55:31 +08:00
committed by Tao Huang
parent ca4017a761
commit 56a786838b
1 changed files with 41 additions and 0 deletions
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41
drivers/power/supply/gpio-charger.c
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@@ -13,6 +13,7 @@
*
*/
#include <linux/extcon-provider.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/interrupt.h>
@@ -39,11 +40,13 @@ struct gpio_charger {
struct power_supply *charger;
struct power_supply_desc charger_desc;
struct extcon_dev *edev;
struct gpio_desc *gpiod;
struct gpio_desc *charge_status;
struct gpio_descs *current_limit_gpios;
struct gpio_mapping *current_limit_map;
struct notifier_block cable_cg_nb;
u32 current_limit_map_size;
u32 charge_current_limit;
};
@@ -246,6 +249,22 @@ static int init_charge_current_limit(struct device *dev,
return 0;
}
static int gpio_charger_evt_notifier(struct notifier_block *nb,
unsigned long event, void *ptr)
{
int limit_ua;
struct gpio_charger *charger =
container_of(nb, struct gpio_charger, cable_cg_nb);
limit_ua = charger->current_limit_map[charger->current_limit_map_size - 1].limit_ua;
if (extcon_get_state(charger->edev, EXTCON_CHG_USB_DCP) > 0)
limit_ua = charger->current_limit_map[0].limit_ua;
set_charge_current_limit(charger, limit_ua);
return NOTIFY_DONE;
}
/*
* The entries will be overwritten by driver's probe routine depending
* on the available features. This list ensures, that the array is big
@@ -261,6 +280,7 @@ 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 extcon_dev *edev;
struct power_supply_config psy_cfg = {};
struct gpio_charger *gpio_charger;
struct power_supply_desc *charger_desc;
@@ -279,6 +299,27 @@ static int gpio_charger_probe(struct platform_device *pdev)
return -ENOMEM;
gpio_charger->dev = dev;
if (of_property_read_bool(dev->of_node, "extcon")) {
edev = extcon_get_edev_by_phandle(dev, 0);
if (IS_ERR(edev)) {
if (PTR_ERR(edev) != -EPROBE_DEFER)
dev_err(dev, "Invalid or missing extcon\n");
return PTR_ERR(edev);
}
gpio_charger->edev = edev;
gpio_charger->cable_cg_nb.notifier_call =
gpio_charger_evt_notifier;
ret = devm_extcon_register_notifier(dev, edev,
EXTCON_CHG_USB_DCP,
&gpio_charger->cable_cg_nb);
if (ret) {
dev_err(dev, "failed to register notifier for CDP\n");
return ret;
}
} else {
gpio_charger->edev = ERR_PTR(-ENODEV);
}
/*
* This will fetch a GPIO descriptor from device tree, ACPI or
* boardfile descriptor tables. It's good to try this first.