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path: root/drivers/leds/leds-lt3593.c
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Diffstat (limited to 'drivers/leds/leds-lt3593.c')
-rw-r--r--drivers/leds/leds-lt3593.c190
1 files changed, 105 insertions, 85 deletions
diff --git a/drivers/leds/leds-lt3593.c b/drivers/leds/leds-lt3593.c
index 5ec730a31b65..de3623e0d094 100644
--- a/drivers/leds/leds-lt3593.c
+++ b/drivers/leds/leds-lt3593.c
@@ -1,32 +1,21 @@
-/*
- * LEDs driver for LT3593 controllers
- *
- * See the datasheet at http://cds.linear.com/docs/Datasheet/3593f.pdf
- *
- * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
- *
- * Based on leds-gpio.c,
- *
- * Copyright (C) 2007 8D Technologies inc.
- * Raphael Assenat <raph@8d.com>
- * Copyright (C) 2008 Freescale Semiconductor, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2009,2018 Daniel Mack <daniel@zonque.org>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/leds.h>
#include <linux/delay.h>
#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
#include <linux/slab.h>
#include <linux/module.h>
+#include <linux/of.h>
+#include <uapi/linux/uleds.h>
struct lt3593_led_data {
+ char name[LED_MAX_NAME_SIZE];
struct led_classdev cdev;
- unsigned gpio;
+ struct gpio_desc *gpiod;
};
static int lt3593_led_set(struct led_classdev *led_cdev,
@@ -46,137 +35,168 @@ static int lt3593_led_set(struct led_classdev *led_cdev,
*/
if (value == 0) {
- gpio_set_value_cansleep(led_dat->gpio, 0);
+ gpiod_set_value_cansleep(led_dat->gpiod, 0);
return 0;
}
pulses = 32 - (value * 32) / 255;
if (pulses == 0) {
- gpio_set_value_cansleep(led_dat->gpio, 0);
+ gpiod_set_value_cansleep(led_dat->gpiod, 0);
mdelay(1);
- gpio_set_value_cansleep(led_dat->gpio, 1);
+ gpiod_set_value_cansleep(led_dat->gpiod, 1);
return 0;
}
- gpio_set_value_cansleep(led_dat->gpio, 1);
+ gpiod_set_value_cansleep(led_dat->gpiod, 1);
while (pulses--) {
- gpio_set_value_cansleep(led_dat->gpio, 0);
+ gpiod_set_value_cansleep(led_dat->gpiod, 0);
udelay(1);
- gpio_set_value_cansleep(led_dat->gpio, 1);
+ gpiod_set_value_cansleep(led_dat->gpiod, 1);
udelay(1);
}
return 0;
}
-static int create_lt3593_led(const struct gpio_led *template,
- struct lt3593_led_data *led_dat, struct device *parent)
+static struct lt3593_led_data *lt3593_led_probe_pdata(struct device *dev)
{
+ struct gpio_led_platform_data *pdata = dev_get_platdata(dev);
+ const struct gpio_led *template = &pdata->leds[0];
+ struct lt3593_led_data *led_data;
int ret, state;
- /* skip leds on GPIOs that aren't available */
- if (!gpio_is_valid(template->gpio)) {
- dev_info(parent, "%s: skipping unavailable LT3593 LED at gpio %d (%s)\n",
- KBUILD_MODNAME, template->gpio, template->name);
- return 0;
- }
+ if (pdata->num_leds != 1)
+ return ERR_PTR(-EINVAL);
- led_dat->cdev.name = template->name;
- led_dat->cdev.default_trigger = template->default_trigger;
- led_dat->gpio = template->gpio;
+ led_data = devm_kzalloc(dev, sizeof(*led_data), GFP_KERNEL);
+ if (!led_data)
+ return ERR_PTR(-ENOMEM);
- led_dat->cdev.brightness_set_blocking = lt3593_led_set;
+ led_data->cdev.name = template->name;
+ led_data->cdev.default_trigger = template->default_trigger;
+ led_data->cdev.brightness_set_blocking = lt3593_led_set;
state = (template->default_state == LEDS_GPIO_DEFSTATE_ON);
- led_dat->cdev.brightness = state ? LED_FULL : LED_OFF;
+ led_data->cdev.brightness = state ? LED_FULL : LED_OFF;
if (!template->retain_state_suspended)
- led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
+ led_data->cdev.flags |= LED_CORE_SUSPENDRESUME;
- ret = devm_gpio_request_one(parent, template->gpio, state ?
+ ret = devm_gpio_request_one(dev, template->gpio, state ?
GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
template->name);
if (ret < 0)
- return ret;
-
- ret = led_classdev_register(parent, &led_dat->cdev);
- if (ret < 0)
- return ret;
+ return ERR_PTR(ret);
- dev_info(parent, "%s: registered LT3593 LED '%s' at GPIO %d\n",
- KBUILD_MODNAME, template->name, template->gpio);
+ led_data->gpiod = gpio_to_desc(template->gpio);
+ if (!led_data->gpiod)
+ return ERR_PTR(-EPROBE_DEFER);
- return 0;
-}
+ ret = devm_led_classdev_register(dev, &led_data->cdev);
+ if (ret < 0)
+ return ERR_PTR(ret);
-static void delete_lt3593_led(struct lt3593_led_data *led)
-{
- if (!gpio_is_valid(led->gpio))
- return;
+ dev_info(dev, "registered LT3593 LED '%s' at GPIO %d\n",
+ template->name, template->gpio);
- led_classdev_unregister(&led->cdev);
+ return led_data;
}
static int lt3593_led_probe(struct platform_device *pdev)
{
- struct gpio_led_platform_data *pdata = dev_get_platdata(&pdev->dev);
- struct lt3593_led_data *leds_data;
- int i, ret = 0;
+ struct device *dev = &pdev->dev;
+ struct lt3593_led_data *led_data;
+ struct fwnode_handle *child;
+ int ret, state = LEDS_GPIO_DEFSTATE_OFF;
+ enum gpiod_flags flags = GPIOD_OUT_LOW;
+ const char *tmp;
+
+ if (dev_get_platdata(dev)) {
+ led_data = lt3593_led_probe_pdata(dev);
+ if (IS_ERR(led_data))
+ return PTR_ERR(led_data);
+
+ goto out;
+ }
- if (!pdata)
- return -EBUSY;
+ if (!dev->of_node)
+ return -ENODEV;
- leds_data = devm_kcalloc(&pdev->dev,
- pdata->num_leds, sizeof(struct lt3593_led_data),
- GFP_KERNEL);
- if (!leds_data)
+ led_data = devm_kzalloc(dev, sizeof(*led_data), GFP_KERNEL);
+ if (!led_data)
return -ENOMEM;
- for (i = 0; i < pdata->num_leds; i++) {
- ret = create_lt3593_led(&pdata->leds[i], &leds_data[i],
- &pdev->dev);
- if (ret < 0)
- goto err;
+ if (device_get_child_node_count(dev) != 1) {
+ dev_err(dev, "Device must have exactly one LED sub-node.");
+ return -EINVAL;
}
- platform_set_drvdata(pdev, leds_data);
+ led_data->gpiod = devm_gpiod_get(dev, "lltc,ctrl", 0);
+ if (IS_ERR(led_data->gpiod))
+ return PTR_ERR(led_data->gpiod);
- return 0;
+ child = device_get_next_child_node(dev, NULL);
-err:
- for (i = i - 1; i >= 0; i--)
- delete_lt3593_led(&leds_data[i]);
+ ret = fwnode_property_read_string(child, "label", &tmp);
+ if (ret < 0)
+ snprintf(led_data->name, sizeof(led_data->name),
+ "lt3593::");
+ else
+ snprintf(led_data->name, sizeof(led_data->name),
+ "lt3593:%s", tmp);
+
+ fwnode_property_read_string(child, "linux,default-trigger",
+ &led_data->cdev.default_trigger);
+
+ if (!fwnode_property_read_string(child, "default-state", &tmp)) {
+ if (!strcmp(tmp, "keep")) {
+ state = LEDS_GPIO_DEFSTATE_KEEP;
+ flags = GPIOD_ASIS;
+ } else if (!strcmp(tmp, "on")) {
+ state = LEDS_GPIO_DEFSTATE_ON;
+ flags = GPIOD_OUT_HIGH;
+ }
+ }
- return ret;
-}
+ led_data->cdev.name = led_data->name;
+ led_data->cdev.brightness_set_blocking = lt3593_led_set;
+ led_data->cdev.brightness = state ? LED_FULL : LED_OFF;
-static int lt3593_led_remove(struct platform_device *pdev)
-{
- int i;
- struct gpio_led_platform_data *pdata = dev_get_platdata(&pdev->dev);
- struct lt3593_led_data *leds_data;
+ ret = devm_led_classdev_register(dev, &led_data->cdev);
+ if (ret < 0) {
+ fwnode_handle_put(child);
+ return ret;
+ }
- leds_data = platform_get_drvdata(pdev);
+ led_data->cdev.dev->of_node = dev->of_node;
- for (i = 0; i < pdata->num_leds; i++)
- delete_lt3593_led(&leds_data[i]);
+out:
+ platform_set_drvdata(pdev, led_data);
return 0;
}
+#ifdef CONFIG_OF
+static const struct of_device_id of_lt3593_leds_match[] = {
+ { .compatible = "lltc,lt3593", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, of_lt3593_leds_match);
+#endif
+
static struct platform_driver lt3593_led_driver = {
.probe = lt3593_led_probe,
- .remove = lt3593_led_remove,
.driver = {
.name = "leds-lt3593",
+ .of_match_table = of_match_ptr(of_lt3593_leds_match),
},
};
module_platform_driver(lt3593_led_driver);
-MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
+MODULE_AUTHOR("Daniel Mack <daniel@zonque.org>");
MODULE_DESCRIPTION("LED driver for LT3593 controllers");
-MODULE_LICENSE("GPL");
+MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:leds-lt3593");
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-23 10:52:57 +0000