// SPDX-License-Identifier: GPL-2.0+
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/*
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* Driver for controlling LEDs for cameras connected to the Intel atomisp2
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* The main purpose of this driver is to turn off LEDs which are on at boot.
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*
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* Copyright (C) 2020 Hans de Goede <hdegoede@redhat.com>
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*/
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#include <linux/dmi.h>
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#include <linux/gpio/consumer.h>
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#include <linux/gpio/machine.h>
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#include <linux/leds.h>
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#include <linux/module.h>
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#include <linux/mod_devicetable.h>
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#include <linux/platform_device.h>
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#include <linux/workqueue.h>
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/* This must be leds-gpio as the leds-gpio driver binds to the name */
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#define DEV_NAME "leds-gpio"
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static const struct gpio_led atomisp2_leds[] = {
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{
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.name = "atomisp2::camera",
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.default_state = LEDS_GPIO_DEFSTATE_OFF,
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},
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};
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static const struct gpio_led_platform_data atomisp2_leds_pdata = {
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.num_leds = ARRAY_SIZE(atomisp2_leds),
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.leds = atomisp2_leds,
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};
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static struct gpiod_lookup_table asus_t100ta_lookup = {
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.dev_id = DEV_NAME,
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.table = {
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GPIO_LOOKUP_IDX("INT33FC:02", 8, NULL, 0, GPIO_ACTIVE_HIGH),
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{ }
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}
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};
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static struct gpiod_lookup_table asus_t100chi_lookup = {
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.dev_id = DEV_NAME,
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.table = {
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GPIO_LOOKUP_IDX("INT33FC:01", 24, NULL, 0, GPIO_ACTIVE_HIGH),
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{ }
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}
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};
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static const struct dmi_system_id atomisp2_led_systems[] __initconst = {
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{
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.matches = {
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DMI_EXACT_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
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DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T100TA"),
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},
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.driver_data = &asus_t100ta_lookup,
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},
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{
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.matches = {
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DMI_EXACT_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
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DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T200TA"),
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},
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.driver_data = &asus_t100ta_lookup,
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},
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{
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.matches = {
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DMI_EXACT_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
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DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T100CHI"),
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},
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.driver_data = &asus_t100chi_lookup,
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},
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{} /* Terminating entry */
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};
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MODULE_DEVICE_TABLE(dmi, atomisp2_led_systems);
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static struct gpiod_lookup_table *gpio_lookup;
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static struct platform_device *pdev;
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static int __init atomisp2_led_init(void)
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{
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const struct dmi_system_id *system;
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system = dmi_first_match(atomisp2_led_systems);
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if (!system)
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return -ENODEV;
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gpio_lookup = system->driver_data;
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gpiod_add_lookup_table(gpio_lookup);
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pdev = platform_device_register_resndata(NULL,
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DEV_NAME, PLATFORM_DEVID_NONE,
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NULL, 0, &atomisp2_leds_pdata,
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sizeof(atomisp2_leds_pdata));
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if (IS_ERR(pdev))
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gpiod_remove_lookup_table(gpio_lookup);
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return PTR_ERR_OR_ZERO(pdev);
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}
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static void __exit atomisp2_led_cleanup(void)
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{
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platform_device_unregister(pdev);
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gpiod_remove_lookup_table(gpio_lookup);
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}
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module_init(atomisp2_led_init);
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module_exit(atomisp2_led_cleanup);
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/*
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* The ACPI INIT method from Asus WMI's code on the T100TA and T200TA turns the
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* LED on (without the WMI interface allowing further control over the LED).
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* Ensure we are loaded after asus-nb-wmi so that we turn the LED off again.
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*/
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MODULE_SOFTDEP("pre: asus_nb_wmi");
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MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com");
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MODULE_DESCRIPTION("Intel atomisp2 camera LED driver");
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MODULE_LICENSE("GPL");
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