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a82cc9b8de
The register-bit-led binding now also supports 'reg' in addition to 'offset' for the register address. Add support to the driver to get the address from 'reg'. Signed-off-by: Rob Herring <robh@kernel.org> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Link: https://lore.kernel.org/r/20231025190619.881090-2-robh@kernel.org Signed-off-by: Lee Jones <lee@kernel.org>
138 lines
3.2 KiB
C
138 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, "reg", &sled->offset) &&
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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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