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b2b998c0f9
Replace of_led_classdev_register() with led_classdev_register_ext(), which
accepts easily extendable struct led_init_data, instead of the fixed
struct device_node argument. The latter can be now passed in an fwnode
property of the struct led_init_data.
The modification is driven by the need for passing additional arguments
required for the forthcoming generic mechanism for composing LED names.
Currently the LED name is conveyed in the "name" char pointer property of
the struct led_classdev. This is redundant since LED class device name
is accessible throughout the whole LED class device life time via
associated struct device's kobj->name property.
The change will not break any existing clients since the patch alters
also existing led_classdev{_flash}_register() macro wrappers, that pass
NULL in place of init_data, which leads to using legacy name
initialization path basing on the struct led_classdev's "name" property.
Three existing users of devm_of_led_classdev_registers() are modified
to use devm_led_classdev_register(), which will not impact their
operation since they in fact didn't need to pass struct device_node on
registration from the beginning.
Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
Cc: Baolin Wang <baolin.wang@linaro.org>
Cc: Dan Murphy <dmurphy@ti.com>
Cc: Daniel Mack <daniel@zonque.org>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Oleh Kravchenko <oleg@kaa.org.ua>
Cc: Sakari Ailus <sakari.ailus@linux.intel.com>
Cc: Simon Shields <simon@lineageos.org>
Acked-by: Pavel Machek <pavel@ucw.cz>
154 lines
3.6 KiB
C
154 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// Copyright (C) 2018 BayLibre SAS
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// Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
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//
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// LED driver for MAXIM 77650/77651 charger/power-supply.
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#include <linux/i2c.h>
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#include <linux/leds.h>
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#include <linux/mfd/max77650.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#define MAX77650_LED_NUM_LEDS 3
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#define MAX77650_LED_A_BASE 0x40
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#define MAX77650_LED_B_BASE 0x43
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#define MAX77650_LED_BR_MASK GENMASK(4, 0)
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#define MAX77650_LED_EN_MASK GENMASK(7, 6)
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#define MAX77650_LED_MAX_BRIGHTNESS MAX77650_LED_BR_MASK
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/* Enable EN_LED_MSTR. */
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#define MAX77650_LED_TOP_DEFAULT BIT(0)
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#define MAX77650_LED_ENABLE GENMASK(7, 6)
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#define MAX77650_LED_DISABLE 0x00
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#define MAX77650_LED_A_DEFAULT MAX77650_LED_DISABLE
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/* 100% on duty */
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#define MAX77650_LED_B_DEFAULT GENMASK(3, 0)
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struct max77650_led {
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struct led_classdev cdev;
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struct regmap *map;
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unsigned int regA;
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unsigned int regB;
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};
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static struct max77650_led *max77650_to_led(struct led_classdev *cdev)
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{
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return container_of(cdev, struct max77650_led, cdev);
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}
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static int max77650_led_brightness_set(struct led_classdev *cdev,
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enum led_brightness brightness)
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{
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struct max77650_led *led = max77650_to_led(cdev);
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int val, mask;
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mask = MAX77650_LED_BR_MASK | MAX77650_LED_EN_MASK;
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if (brightness == LED_OFF)
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val = MAX77650_LED_DISABLE;
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else
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val = MAX77650_LED_ENABLE | brightness;
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return regmap_update_bits(led->map, led->regA, mask, val);
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}
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static int max77650_led_probe(struct platform_device *pdev)
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{
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struct device_node *of_node, *child;
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struct max77650_led *leds, *led;
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struct device *dev;
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struct regmap *map;
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const char *label;
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int rv, num_leds;
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u32 reg;
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dev = &pdev->dev;
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of_node = dev->of_node;
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if (!of_node)
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return -ENODEV;
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leds = devm_kcalloc(dev, sizeof(*leds),
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MAX77650_LED_NUM_LEDS, GFP_KERNEL);
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if (!leds)
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return -ENOMEM;
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map = dev_get_regmap(dev->parent, NULL);
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if (!map)
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return -ENODEV;
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num_leds = of_get_child_count(of_node);
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if (!num_leds || num_leds > MAX77650_LED_NUM_LEDS)
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return -ENODEV;
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for_each_child_of_node(of_node, child) {
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rv = of_property_read_u32(child, "reg", ®);
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if (rv || reg >= MAX77650_LED_NUM_LEDS) {
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rv = -EINVAL;
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goto err_node_put;
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}
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led = &leds[reg];
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led->map = map;
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led->regA = MAX77650_LED_A_BASE + reg;
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led->regB = MAX77650_LED_B_BASE + reg;
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led->cdev.brightness_set_blocking = max77650_led_brightness_set;
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led->cdev.max_brightness = MAX77650_LED_MAX_BRIGHTNESS;
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label = of_get_property(child, "label", NULL);
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if (!label) {
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led->cdev.name = "max77650::";
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} else {
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led->cdev.name = devm_kasprintf(dev, GFP_KERNEL,
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"max77650:%s", label);
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if (!led->cdev.name) {
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rv = -ENOMEM;
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goto err_node_put;
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}
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}
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of_property_read_string(child, "linux,default-trigger",
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&led->cdev.default_trigger);
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rv = devm_led_classdev_register(dev, &led->cdev);
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if (rv)
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goto err_node_put;
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rv = regmap_write(map, led->regA, MAX77650_LED_A_DEFAULT);
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if (rv)
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goto err_node_put;
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rv = regmap_write(map, led->regB, MAX77650_LED_B_DEFAULT);
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if (rv)
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goto err_node_put;
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}
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return regmap_write(map,
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MAX77650_REG_CNFG_LED_TOP,
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MAX77650_LED_TOP_DEFAULT);
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err_node_put:
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of_node_put(child);
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return rv;
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}
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static struct platform_driver max77650_led_driver = {
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.driver = {
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.name = "max77650-led",
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},
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.probe = max77650_led_probe,
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};
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module_platform_driver(max77650_led_driver);
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MODULE_DESCRIPTION("MAXIM 77650/77651 LED driver");
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MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:max77650-led");
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