mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 08:19:28 +00:00
![Sudip Mukherjee](/assets/img/avatar_default.png)
Coccinelle suggested using PTR_ERR_OR_ZERO() and looking at the code, we can use PTR_ERR_OR_ZERO() instead of checking IS_ERR() and then doing 'return 0'. Tested-by: Lukas Bulwahn <lukas.bulwahn@gmail.com> Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com> Link: https://lore.kernel.org/r/20201026180026.3350-1-sudipm.mukherjee@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
270 lines
7.1 KiB
C
270 lines
7.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Support for usb functionality of Hikey series boards
|
|
* based on Hisilicon Kirin Soc.
|
|
*
|
|
* Copyright (C) 2017-2018 Hilisicon Electronics Co., Ltd.
|
|
* http://www.huawei.com
|
|
*
|
|
* Authors: Yu Chen <chenyu56@huawei.com>
|
|
*/
|
|
|
|
#include <linux/gpio/consumer.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/mod_devicetable.h>
|
|
#include <linux/module.h>
|
|
#include <linux/notifier.h>
|
|
#include <linux/of_gpio.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/property.h>
|
|
#include <linux/regulator/consumer.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/usb/role.h>
|
|
|
|
#define DEVICE_DRIVER_NAME "hisi_hikey_usb"
|
|
|
|
#define HUB_VBUS_POWER_ON 1
|
|
#define HUB_VBUS_POWER_OFF 0
|
|
#define USB_SWITCH_TO_HUB 1
|
|
#define USB_SWITCH_TO_TYPEC 0
|
|
#define TYPEC_VBUS_POWER_ON 1
|
|
#define TYPEC_VBUS_POWER_OFF 0
|
|
|
|
struct hisi_hikey_usb {
|
|
struct device *dev;
|
|
struct gpio_desc *otg_switch;
|
|
struct gpio_desc *typec_vbus;
|
|
struct gpio_desc *hub_vbus;
|
|
struct gpio_desc *reset;
|
|
|
|
struct regulator *regulator;
|
|
|
|
struct usb_role_switch *hub_role_sw;
|
|
|
|
struct usb_role_switch *dev_role_sw;
|
|
enum usb_role role;
|
|
|
|
struct mutex lock;
|
|
struct work_struct work;
|
|
|
|
struct notifier_block nb;
|
|
};
|
|
|
|
static void hub_power_ctrl(struct hisi_hikey_usb *hisi_hikey_usb, int value)
|
|
{
|
|
int ret, status;
|
|
|
|
if (hisi_hikey_usb->hub_vbus)
|
|
gpiod_set_value_cansleep(hisi_hikey_usb->hub_vbus, value);
|
|
|
|
if (!hisi_hikey_usb->regulator)
|
|
return;
|
|
|
|
status = regulator_is_enabled(hisi_hikey_usb->regulator);
|
|
if (status == !!value)
|
|
return;
|
|
|
|
if (value)
|
|
ret = regulator_enable(hisi_hikey_usb->regulator);
|
|
else
|
|
ret = regulator_disable(hisi_hikey_usb->regulator);
|
|
|
|
if (ret)
|
|
dev_err(hisi_hikey_usb->dev,
|
|
"Can't switch regulator state to %s\n",
|
|
value ? "enabled" : "disabled");
|
|
}
|
|
|
|
static void usb_switch_ctrl(struct hisi_hikey_usb *hisi_hikey_usb,
|
|
int switch_to)
|
|
{
|
|
if (!hisi_hikey_usb->otg_switch)
|
|
return;
|
|
|
|
gpiod_set_value_cansleep(hisi_hikey_usb->otg_switch, switch_to);
|
|
}
|
|
|
|
static void usb_typec_power_ctrl(struct hisi_hikey_usb *hisi_hikey_usb,
|
|
int value)
|
|
{
|
|
if (!hisi_hikey_usb->typec_vbus)
|
|
return;
|
|
|
|
gpiod_set_value_cansleep(hisi_hikey_usb->typec_vbus, value);
|
|
}
|
|
|
|
static void relay_set_role_switch(struct work_struct *work)
|
|
{
|
|
struct hisi_hikey_usb *hisi_hikey_usb = container_of(work,
|
|
struct hisi_hikey_usb,
|
|
work);
|
|
struct usb_role_switch *sw;
|
|
enum usb_role role;
|
|
|
|
if (!hisi_hikey_usb || !hisi_hikey_usb->dev_role_sw)
|
|
return;
|
|
|
|
mutex_lock(&hisi_hikey_usb->lock);
|
|
switch (hisi_hikey_usb->role) {
|
|
case USB_ROLE_NONE:
|
|
usb_typec_power_ctrl(hisi_hikey_usb, TYPEC_VBUS_POWER_OFF);
|
|
usb_switch_ctrl(hisi_hikey_usb, USB_SWITCH_TO_HUB);
|
|
hub_power_ctrl(hisi_hikey_usb, HUB_VBUS_POWER_ON);
|
|
break;
|
|
case USB_ROLE_HOST:
|
|
hub_power_ctrl(hisi_hikey_usb, HUB_VBUS_POWER_OFF);
|
|
usb_switch_ctrl(hisi_hikey_usb, USB_SWITCH_TO_TYPEC);
|
|
usb_typec_power_ctrl(hisi_hikey_usb, TYPEC_VBUS_POWER_ON);
|
|
break;
|
|
case USB_ROLE_DEVICE:
|
|
hub_power_ctrl(hisi_hikey_usb, HUB_VBUS_POWER_OFF);
|
|
usb_typec_power_ctrl(hisi_hikey_usb, TYPEC_VBUS_POWER_OFF);
|
|
usb_switch_ctrl(hisi_hikey_usb, USB_SWITCH_TO_TYPEC);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
sw = hisi_hikey_usb->dev_role_sw;
|
|
role = hisi_hikey_usb->role;
|
|
mutex_unlock(&hisi_hikey_usb->lock);
|
|
|
|
usb_role_switch_set_role(sw, role);
|
|
}
|
|
|
|
static int hub_usb_role_switch_set(struct usb_role_switch *sw, enum usb_role role)
|
|
{
|
|
struct hisi_hikey_usb *hisi_hikey_usb = usb_role_switch_get_drvdata(sw);
|
|
|
|
if (!hisi_hikey_usb || !hisi_hikey_usb->dev_role_sw)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&hisi_hikey_usb->lock);
|
|
hisi_hikey_usb->role = role;
|
|
mutex_unlock(&hisi_hikey_usb->lock);
|
|
|
|
schedule_work(&hisi_hikey_usb->work);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int hisi_hikey_usb_parse_kirin970(struct platform_device *pdev,
|
|
struct hisi_hikey_usb *hisi_hikey_usb)
|
|
{
|
|
struct regulator *regulator;
|
|
|
|
regulator = devm_regulator_get(&pdev->dev, "hub-vdd");
|
|
if (IS_ERR(regulator)) {
|
|
if (PTR_ERR(regulator) == -EPROBE_DEFER) {
|
|
dev_info(&pdev->dev,
|
|
"waiting for hub-vdd-supply to be probed\n");
|
|
return PTR_ERR(regulator);
|
|
}
|
|
dev_err(&pdev->dev,
|
|
"get hub-vdd-supply failed with error %ld\n",
|
|
PTR_ERR(regulator));
|
|
return PTR_ERR(regulator);
|
|
}
|
|
hisi_hikey_usb->regulator = regulator;
|
|
|
|
hisi_hikey_usb->reset = devm_gpiod_get(&pdev->dev, "hub_reset_en_gpio",
|
|
GPIOD_OUT_HIGH);
|
|
return PTR_ERR_OR_ZERO(hisi_hikey_usb->reset);
|
|
}
|
|
|
|
static int hisi_hikey_usb_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct hisi_hikey_usb *hisi_hikey_usb;
|
|
struct usb_role_switch_desc hub_role_switch = {NULL};
|
|
int ret;
|
|
|
|
hisi_hikey_usb = devm_kzalloc(dev, sizeof(*hisi_hikey_usb), GFP_KERNEL);
|
|
if (!hisi_hikey_usb)
|
|
return -ENOMEM;
|
|
|
|
hisi_hikey_usb->dev = &pdev->dev;
|
|
|
|
hisi_hikey_usb->otg_switch = devm_gpiod_get(dev, "otg-switch",
|
|
GPIOD_OUT_HIGH);
|
|
if (IS_ERR(hisi_hikey_usb->otg_switch))
|
|
return PTR_ERR(hisi_hikey_usb->otg_switch);
|
|
|
|
hisi_hikey_usb->typec_vbus = devm_gpiod_get(dev, "typec-vbus",
|
|
GPIOD_OUT_LOW);
|
|
if (IS_ERR(hisi_hikey_usb->typec_vbus))
|
|
return PTR_ERR(hisi_hikey_usb->typec_vbus);
|
|
|
|
/* Parse Kirin 970-specific OF data */
|
|
if (of_device_is_compatible(pdev->dev.of_node,
|
|
"hisilicon,kirin970_hikey_usbhub")) {
|
|
ret = hisi_hikey_usb_parse_kirin970(pdev, hisi_hikey_usb);
|
|
if (ret)
|
|
return ret;
|
|
} else {
|
|
/* hub-vdd33-en is optional */
|
|
hisi_hikey_usb->hub_vbus = devm_gpiod_get_optional(dev, "hub-vdd33-en",
|
|
GPIOD_OUT_HIGH);
|
|
if (IS_ERR(hisi_hikey_usb->hub_vbus))
|
|
return PTR_ERR(hisi_hikey_usb->hub_vbus);
|
|
}
|
|
|
|
hisi_hikey_usb->dev_role_sw = usb_role_switch_get(dev);
|
|
if (!hisi_hikey_usb->dev_role_sw)
|
|
return -EPROBE_DEFER;
|
|
if (IS_ERR(hisi_hikey_usb->dev_role_sw))
|
|
return PTR_ERR(hisi_hikey_usb->dev_role_sw);
|
|
|
|
INIT_WORK(&hisi_hikey_usb->work, relay_set_role_switch);
|
|
mutex_init(&hisi_hikey_usb->lock);
|
|
|
|
hub_role_switch.fwnode = dev_fwnode(dev);
|
|
hub_role_switch.set = hub_usb_role_switch_set;
|
|
hub_role_switch.driver_data = hisi_hikey_usb;
|
|
|
|
hisi_hikey_usb->hub_role_sw = usb_role_switch_register(dev,
|
|
&hub_role_switch);
|
|
|
|
if (IS_ERR(hisi_hikey_usb->hub_role_sw)) {
|
|
usb_role_switch_put(hisi_hikey_usb->dev_role_sw);
|
|
return PTR_ERR(hisi_hikey_usb->hub_role_sw);
|
|
}
|
|
|
|
platform_set_drvdata(pdev, hisi_hikey_usb);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int hisi_hikey_usb_remove(struct platform_device *pdev)
|
|
{
|
|
struct hisi_hikey_usb *hisi_hikey_usb = platform_get_drvdata(pdev);
|
|
|
|
if (hisi_hikey_usb->hub_role_sw)
|
|
usb_role_switch_unregister(hisi_hikey_usb->hub_role_sw);
|
|
|
|
if (hisi_hikey_usb->dev_role_sw)
|
|
usb_role_switch_put(hisi_hikey_usb->dev_role_sw);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id id_table_hisi_hikey_usb[] = {
|
|
{ .compatible = "hisilicon,gpio_hubv1" },
|
|
{ .compatible = "hisilicon,kirin970_hikey_usbhub" },
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(of, id_table_hisi_hikey_usb);
|
|
|
|
static struct platform_driver hisi_hikey_usb_driver = {
|
|
.probe = hisi_hikey_usb_probe,
|
|
.remove = hisi_hikey_usb_remove,
|
|
.driver = {
|
|
.name = DEVICE_DRIVER_NAME,
|
|
.of_match_table = id_table_hisi_hikey_usb,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(hisi_hikey_usb_driver);
|
|
|
|
MODULE_AUTHOR("Yu Chen <chenyu56@huawei.com>");
|
|
MODULE_DESCRIPTION("Driver Support for USB functionality of Hikey");
|
|
MODULE_LICENSE("GPL v2");
|