diff options
Diffstat (limited to 'drivers/platform/x86/intel/int3472/led.c')
-rw-r--r-- | drivers/platform/x86/intel/int3472/led.c | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/drivers/platform/x86/intel/int3472/led.c b/drivers/platform/x86/intel/int3472/led.c new file mode 100644 index 0000000000..bca1ce7d0d --- /dev/null +++ b/drivers/platform/x86/intel/int3472/led.c @@ -0,0 +1,75 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Author: Hans de Goede <hdegoede@redhat.com> */ + +#include <linux/acpi.h> +#include <linux/gpio/consumer.h> +#include <linux/leds.h> +#include "common.h" + +static int int3472_pled_set(struct led_classdev *led_cdev, + enum led_brightness brightness) +{ + struct int3472_discrete_device *int3472 = + container_of(led_cdev, struct int3472_discrete_device, pled.classdev); + + gpiod_set_value_cansleep(int3472->pled.gpio, brightness); + return 0; +} + +int skl_int3472_register_pled(struct int3472_discrete_device *int3472, + struct acpi_resource_gpio *agpio, u32 polarity) +{ + char *p, *path = agpio->resource_source.string_ptr; + int ret; + + if (int3472->pled.classdev.dev) + return -EBUSY; + + int3472->pled.gpio = acpi_get_and_request_gpiod(path, agpio->pin_table[0], + "int3472,privacy-led"); + if (IS_ERR(int3472->pled.gpio)) + return dev_err_probe(int3472->dev, PTR_ERR(int3472->pled.gpio), + "getting privacy LED GPIO\n"); + + if (polarity == GPIO_ACTIVE_LOW) + gpiod_toggle_active_low(int3472->pled.gpio); + + /* Ensure the pin is in output mode and non-active state */ + gpiod_direction_output(int3472->pled.gpio, 0); + + /* Generate the name, replacing the ':' in the ACPI devname with '_' */ + snprintf(int3472->pled.name, sizeof(int3472->pled.name), + "%s::privacy_led", acpi_dev_name(int3472->sensor)); + p = strchr(int3472->pled.name, ':'); + if (p) + *p = '_'; + + int3472->pled.classdev.name = int3472->pled.name; + int3472->pled.classdev.max_brightness = 1; + int3472->pled.classdev.brightness_set_blocking = int3472_pled_set; + + ret = led_classdev_register(int3472->dev, &int3472->pled.classdev); + if (ret) + goto err_free_gpio; + + int3472->pled.lookup.provider = int3472->pled.name; + int3472->pled.lookup.dev_id = int3472->sensor_name; + int3472->pled.lookup.con_id = "privacy-led"; + led_add_lookup(&int3472->pled.lookup); + + return 0; + +err_free_gpio: + gpiod_put(int3472->pled.gpio); + return ret; +} + +void skl_int3472_unregister_pled(struct int3472_discrete_device *int3472) +{ + if (IS_ERR_OR_NULL(int3472->pled.classdev.dev)) + return; + + led_remove_lookup(&int3472->pled.lookup); + led_classdev_unregister(&int3472->pled.classdev); + gpiod_put(int3472->pled.gpio); +} |