diff options
Diffstat (limited to 'drivers/gpio/gpio-usbio.c')
| -rw-r--r-- | drivers/gpio/gpio-usbio.c | 247 |
1 files changed, 247 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-usbio.c b/drivers/gpio/gpio-usbio.c new file mode 100644 index 000000000000..e13c120824e3 --- /dev/null +++ b/drivers/gpio/gpio-usbio.c @@ -0,0 +1,247 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2025 Intel Corporation. + * Copyright (c) 2025 Red Hat, Inc. + */ + +#include <linux/acpi.h> +#include <linux/auxiliary_bus.h> +#include <linux/cleanup.h> +#include <linux/device.h> +#include <linux/gpio/driver.h> +#include <linux/mutex.h> +#include <linux/types.h> +#include <linux/usb/usbio.h> + +struct usbio_gpio_bank { + u8 config[USBIO_GPIOSPERBANK]; + u32 bitmap; +}; + +struct usbio_gpio { + struct mutex config_mutex; /* Protects banks[x].config */ + struct usbio_gpio_bank banks[USBIO_MAX_GPIOBANKS]; + struct gpio_chip gc; + struct auxiliary_device *adev; +}; + +static const struct acpi_device_id usbio_gpio_acpi_hids[] = { + { "INTC1007" }, /* MTL */ + { "INTC10B2" }, /* ARL */ + { "INTC10B5" }, /* LNL */ + { "INTC10E2" }, /* PTL */ + { } +}; + +static void usbio_gpio_get_bank_and_pin(struct gpio_chip *gc, unsigned int offset, + struct usbio_gpio_bank **bank_ret, + unsigned int *pin_ret) +{ + struct usbio_gpio *gpio = gpiochip_get_data(gc); + struct device *dev = &gpio->adev->dev; + struct usbio_gpio_bank *bank; + unsigned int pin; + + bank = &gpio->banks[offset / USBIO_GPIOSPERBANK]; + pin = offset % USBIO_GPIOSPERBANK; + if (~bank->bitmap & BIT(pin)) { + /* The FW bitmap sometimes is invalid, warn and continue */ + dev_warn_once(dev, FW_BUG "GPIO %u is not in FW pins bitmap\n", offset); + } + + *bank_ret = bank; + *pin_ret = pin; +} + +static int usbio_gpio_get_direction(struct gpio_chip *gc, unsigned int offset) +{ + struct usbio_gpio_bank *bank; + unsigned int pin; + u8 cfg; + + usbio_gpio_get_bank_and_pin(gc, offset, &bank, &pin); + + cfg = bank->config[pin] & USBIO_GPIO_PINMOD_MASK; + + return (cfg == USBIO_GPIO_PINMOD_OUTPUT) ? + GPIO_LINE_DIRECTION_OUT : GPIO_LINE_DIRECTION_IN; +} + +static int usbio_gpio_get(struct gpio_chip *gc, unsigned int offset) +{ + struct usbio_gpio *gpio = gpiochip_get_data(gc); + struct usbio_gpio_bank *bank; + struct usbio_gpio_rw gbuf; + unsigned int pin; + int ret; + + usbio_gpio_get_bank_and_pin(gc, offset, &bank, &pin); + + gbuf.bankid = offset / USBIO_GPIOSPERBANK; + gbuf.pincount = 1; + gbuf.pin = pin; + + ret = usbio_control_msg(gpio->adev, USBIO_PKTTYPE_GPIO, USBIO_GPIOCMD_READ, + &gbuf, sizeof(gbuf) - sizeof(gbuf.value), + &gbuf, sizeof(gbuf)); + if (ret != sizeof(gbuf)) + return (ret < 0) ? ret : -EPROTO; + + return (le32_to_cpu(gbuf.value) >> pin) & 1; +} + +static int usbio_gpio_set(struct gpio_chip *gc, unsigned int offset, int value) +{ + struct usbio_gpio *gpio = gpiochip_get_data(gc); + struct usbio_gpio_bank *bank; + struct usbio_gpio_rw gbuf; + unsigned int pin; + + usbio_gpio_get_bank_and_pin(gc, offset, &bank, &pin); + + gbuf.bankid = offset / USBIO_GPIOSPERBANK; + gbuf.pincount = 1; + gbuf.pin = pin; + gbuf.value = cpu_to_le32(value << pin); + + return usbio_control_msg(gpio->adev, USBIO_PKTTYPE_GPIO, USBIO_GPIOCMD_WRITE, + &gbuf, sizeof(gbuf), NULL, 0); +} + +static int usbio_gpio_update_config(struct gpio_chip *gc, unsigned int offset, + u8 mask, u8 value) +{ + struct usbio_gpio *gpio = gpiochip_get_data(gc); + struct usbio_gpio_bank *bank; + struct usbio_gpio_init gbuf; + unsigned int pin; + + usbio_gpio_get_bank_and_pin(gc, offset, &bank, &pin); + + guard(mutex)(&gpio->config_mutex); + + bank->config[pin] &= ~mask; + bank->config[pin] |= value; + + gbuf.bankid = offset / USBIO_GPIOSPERBANK; + gbuf.config = bank->config[pin]; + gbuf.pincount = 1; + gbuf.pin = pin; + + return usbio_control_msg(gpio->adev, USBIO_PKTTYPE_GPIO, USBIO_GPIOCMD_INIT, + &gbuf, sizeof(gbuf), NULL, 0); +} + +static int usbio_gpio_direction_input(struct gpio_chip *gc, unsigned int offset) +{ + return usbio_gpio_update_config(gc, offset, USBIO_GPIO_PINMOD_MASK, + USBIO_GPIO_SET_PINMOD(USBIO_GPIO_PINMOD_INPUT)); +} + +static int usbio_gpio_direction_output(struct gpio_chip *gc, + unsigned int offset, int value) +{ + int ret; + + ret = usbio_gpio_update_config(gc, offset, USBIO_GPIO_PINMOD_MASK, + USBIO_GPIO_SET_PINMOD(USBIO_GPIO_PINMOD_OUTPUT)); + if (ret) + return ret; + + return usbio_gpio_set(gc, offset, value); +} + +static int usbio_gpio_set_config(struct gpio_chip *gc, unsigned int offset, + unsigned long config) +{ + u8 value; + + switch (pinconf_to_config_param(config)) { + case PIN_CONFIG_BIAS_PULL_PIN_DEFAULT: + value = USBIO_GPIO_SET_PINCFG(USBIO_GPIO_PINCFG_DEFAULT); + break; + case PIN_CONFIG_BIAS_PULL_UP: + value = USBIO_GPIO_SET_PINCFG(USBIO_GPIO_PINCFG_PULLUP); + break; + case PIN_CONFIG_BIAS_PULL_DOWN: + value = USBIO_GPIO_SET_PINCFG(USBIO_GPIO_PINCFG_PULLDOWN); + break; + case PIN_CONFIG_DRIVE_PUSH_PULL: + value = USBIO_GPIO_SET_PINCFG(USBIO_GPIO_PINCFG_PUSHPULL); + break; + default: + return -ENOTSUPP; + } + + return usbio_gpio_update_config(gc, offset, USBIO_GPIO_PINCFG_MASK, value); +} + +static int usbio_gpio_probe(struct auxiliary_device *adev, + const struct auxiliary_device_id *adev_id) +{ + struct usbio_gpio_bank_desc *bank_desc; + struct device *dev = &adev->dev; + struct usbio_gpio *gpio; + int bank, ret; + + bank_desc = dev_get_platdata(dev); + if (!bank_desc) + return -EINVAL; + + gpio = devm_kzalloc(dev, sizeof(*gpio), GFP_KERNEL); + if (!gpio) + return -ENOMEM; + + ret = devm_mutex_init(dev, &gpio->config_mutex); + if (ret) + return ret; + + gpio->adev = adev; + + usbio_acpi_bind(gpio->adev, usbio_gpio_acpi_hids); + + for (bank = 0; bank < USBIO_MAX_GPIOBANKS && bank_desc[bank].bmap; bank++) + gpio->banks[bank].bitmap = le32_to_cpu(bank_desc[bank].bmap); + + gpio->gc.label = ACPI_COMPANION(dev) ? + acpi_dev_name(ACPI_COMPANION(dev)) : dev_name(dev); + gpio->gc.parent = dev; + gpio->gc.owner = THIS_MODULE; + gpio->gc.get_direction = usbio_gpio_get_direction; + gpio->gc.direction_input = usbio_gpio_direction_input; + gpio->gc.direction_output = usbio_gpio_direction_output; + gpio->gc.get = usbio_gpio_get; + gpio->gc.set = usbio_gpio_set; + gpio->gc.set_config = usbio_gpio_set_config; + gpio->gc.base = -1; + gpio->gc.ngpio = bank * USBIO_GPIOSPERBANK; + gpio->gc.can_sleep = true; + + ret = devm_gpiochip_add_data(dev, &gpio->gc, gpio); + if (ret) + return ret; + + if (has_acpi_companion(dev)) + acpi_dev_clear_dependencies(ACPI_COMPANION(dev)); + + return 0; +} + +static const struct auxiliary_device_id usbio_gpio_id_table[] = { + { "usbio.usbio-gpio" }, + { } +}; +MODULE_DEVICE_TABLE(auxiliary, usbio_gpio_id_table); + +static struct auxiliary_driver usbio_gpio_driver = { + .name = USBIO_GPIO_CLIENT, + .probe = usbio_gpio_probe, + .id_table = usbio_gpio_id_table +}; +module_auxiliary_driver(usbio_gpio_driver); + +MODULE_DESCRIPTION("Intel USBIO GPIO driver"); +MODULE_AUTHOR("Israel Cepeda <israel.a.cepeda.lopez@intel.com>"); +MODULE_AUTHOR("Hans de Goede <hansg@kernel.org>"); +MODULE_LICENSE("GPL"); +MODULE_IMPORT_NS("USBIO"); |