forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
270 lines
7.1 KiB
270 lines
7.1 KiB
// 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 <[email protected]> |
|
*/ |
|
|
|
#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 <[email protected]>"); |
|
MODULE_DESCRIPTION("Driver Support for USB functionality of Hikey"); |
|
MODULE_LICENSE("GPL v2");
|
|
|