diff options
Diffstat (limited to 'drivers/misc/hisi_hikey_usb.c')
| -rw-r--r-- | drivers/misc/hisi_hikey_usb.c | 273 |
1 files changed, 273 insertions, 0 deletions
diff --git a/drivers/misc/hisi_hikey_usb.c b/drivers/misc/hisi_hikey_usb.c new file mode 100644 index 000000000000..cc93569e601c --- /dev/null +++ b/drivers/misc/hisi_hikey_usb.c @@ -0,0 +1,273 @@ +// 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); + if (IS_ERR(hisi_hikey_usb->reset)) + return PTR_ERR(hisi_hikey_usb->reset); + + return 0; +} + +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"); |