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116 lines
3.0 KiB
116 lines
3.0 KiB
// 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 <[email protected]> |
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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 <[email protected]"); |
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MODULE_DESCRIPTION("Intel atomisp2 camera LED driver"); |
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MODULE_LICENSE("GPL");
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