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3192f14124
The DT of_device.h and of_platform.h date back to the separate of_platform_bus_type before it as merged into the regular platform bus. As part of that merge prepping Arm DT support 13 years ago, they "temporarily" include each other. They also include platform_device.h and of.h. As a result, there's a pretty much random mix of those include files used throughout the tree. In order to detangle these headers and replace the implicit includes with struct declarations, users need to explicitly include the correct includes. Signed-off-by: Rob Herring <robh@kernel.org> Link: https://lore.kernel.org/r/20230714174651.4058753-1-robh@kernel.org Signed-off-by: Lee Jones <lee@kernel.org>
137 lines
3.2 KiB
C
137 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Generic Syscon LEDs Driver
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*
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* Copyright (c) 2014, Linaro Limited
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* Author: Linus Walleij <linus.walleij@linaro.org>
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*/
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#include <linux/io.h>
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#include <linux/init.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/stat.h>
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#include <linux/slab.h>
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#include <linux/mfd/syscon.h>
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#include <linux/regmap.h>
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#include <linux/leds.h>
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/**
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* struct syscon_led - state container for syscon based LEDs
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* @cdev: LED class device for this LED
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* @map: regmap to access the syscon device backing this LED
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* @offset: the offset into the syscon regmap for the LED register
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* @mask: the bit in the register corresponding to the LED
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* @state: current state of the LED
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*/
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struct syscon_led {
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struct led_classdev cdev;
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struct regmap *map;
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u32 offset;
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u32 mask;
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bool state;
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};
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static void syscon_led_set(struct led_classdev *led_cdev,
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enum led_brightness value)
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{
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struct syscon_led *sled =
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container_of(led_cdev, struct syscon_led, cdev);
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u32 val;
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int ret;
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if (value == LED_OFF) {
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val = 0;
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sled->state = false;
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} else {
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val = sled->mask;
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sled->state = true;
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}
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ret = regmap_update_bits(sled->map, sled->offset, sled->mask, val);
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if (ret < 0)
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dev_err(sled->cdev.dev, "error updating LED status\n");
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}
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static int syscon_led_probe(struct platform_device *pdev)
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{
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struct led_init_data init_data = {};
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struct device *dev = &pdev->dev;
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struct device_node *np = dev_of_node(dev);
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struct device *parent;
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struct regmap *map;
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struct syscon_led *sled;
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enum led_default_state state;
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u32 value;
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int ret;
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parent = dev->parent;
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if (!parent) {
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dev_err(dev, "no parent for syscon LED\n");
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return -ENODEV;
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}
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map = syscon_node_to_regmap(dev_of_node(parent));
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if (IS_ERR(map)) {
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dev_err(dev, "no regmap for syscon LED parent\n");
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return PTR_ERR(map);
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}
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sled = devm_kzalloc(dev, sizeof(*sled), GFP_KERNEL);
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if (!sled)
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return -ENOMEM;
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sled->map = map;
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if (of_property_read_u32(np, "offset", &sled->offset))
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return -EINVAL;
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if (of_property_read_u32(np, "mask", &sled->mask))
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return -EINVAL;
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init_data.fwnode = of_fwnode_handle(np);
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state = led_init_default_state_get(init_data.fwnode);
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switch (state) {
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case LEDS_DEFSTATE_ON:
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ret = regmap_update_bits(map, sled->offset, sled->mask, sled->mask);
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if (ret < 0)
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return ret;
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sled->state = true;
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break;
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case LEDS_DEFSTATE_KEEP:
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ret = regmap_read(map, sled->offset, &value);
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if (ret < 0)
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return ret;
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sled->state = !!(value & sled->mask);
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break;
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default:
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ret = regmap_update_bits(map, sled->offset, sled->mask, 0);
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if (ret < 0)
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return ret;
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sled->state = false;
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}
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sled->cdev.brightness_set = syscon_led_set;
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ret = devm_led_classdev_register_ext(dev, &sled->cdev, &init_data);
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if (ret < 0)
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return ret;
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platform_set_drvdata(pdev, sled);
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dev_info(dev, "registered LED %s\n", sled->cdev.name);
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return 0;
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}
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static const struct of_device_id of_syscon_leds_match[] = {
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{ .compatible = "register-bit-led", },
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{},
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};
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static struct platform_driver syscon_led_driver = {
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.probe = syscon_led_probe,
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.driver = {
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.name = "leds-syscon",
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.of_match_table = of_syscon_leds_match,
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.suppress_bind_attrs = true,
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},
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};
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builtin_platform_driver(syscon_led_driver);
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