mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-07 02:26:39 +07:00
c6e71f813f
Instead of overriding error codes, pass them on unmodified. This way a EPROBE_DEFER is correctly passed to the driver core. This results in the LED driver correctly requesting probe deferral in cases the GPIO controller is not yet available. Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Reported-and-tested-by: Andreas Färber <afaerber@suse.de> Signed-off-by: Bryan Wu <cooloney@gmail.com>
305 lines
7.6 KiB
C
305 lines
7.6 KiB
C
/*
|
|
* LEDs driver for GPIOs
|
|
*
|
|
* 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.
|
|
*
|
|
*/
|
|
#include <linux/err.h>
|
|
#include <linux/gpio.h>
|
|
#include <linux/gpio/consumer.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/leds.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/property.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/workqueue.h>
|
|
|
|
struct gpio_led_data {
|
|
struct led_classdev cdev;
|
|
struct gpio_desc *gpiod;
|
|
struct work_struct work;
|
|
u8 new_level;
|
|
u8 can_sleep;
|
|
u8 blinking;
|
|
int (*platform_gpio_blink_set)(struct gpio_desc *desc, int state,
|
|
unsigned long *delay_on, unsigned long *delay_off);
|
|
};
|
|
|
|
static void gpio_led_work(struct work_struct *work)
|
|
{
|
|
struct gpio_led_data *led_dat =
|
|
container_of(work, struct gpio_led_data, work);
|
|
|
|
if (led_dat->blinking) {
|
|
led_dat->platform_gpio_blink_set(led_dat->gpiod,
|
|
led_dat->new_level, NULL, NULL);
|
|
led_dat->blinking = 0;
|
|
} else
|
|
gpiod_set_value_cansleep(led_dat->gpiod, led_dat->new_level);
|
|
}
|
|
|
|
static void gpio_led_set(struct led_classdev *led_cdev,
|
|
enum led_brightness value)
|
|
{
|
|
struct gpio_led_data *led_dat =
|
|
container_of(led_cdev, struct gpio_led_data, cdev);
|
|
int level;
|
|
|
|
if (value == LED_OFF)
|
|
level = 0;
|
|
else
|
|
level = 1;
|
|
|
|
/* Setting GPIOs with I2C/etc requires a task context, and we don't
|
|
* seem to have a reliable way to know if we're already in one; so
|
|
* let's just assume the worst.
|
|
*/
|
|
if (led_dat->can_sleep) {
|
|
led_dat->new_level = level;
|
|
schedule_work(&led_dat->work);
|
|
} else {
|
|
if (led_dat->blinking) {
|
|
led_dat->platform_gpio_blink_set(led_dat->gpiod, level,
|
|
NULL, NULL);
|
|
led_dat->blinking = 0;
|
|
} else
|
|
gpiod_set_value(led_dat->gpiod, level);
|
|
}
|
|
}
|
|
|
|
static int gpio_blink_set(struct led_classdev *led_cdev,
|
|
unsigned long *delay_on, unsigned long *delay_off)
|
|
{
|
|
struct gpio_led_data *led_dat =
|
|
container_of(led_cdev, struct gpio_led_data, cdev);
|
|
|
|
led_dat->blinking = 1;
|
|
return led_dat->platform_gpio_blink_set(led_dat->gpiod, GPIO_LED_BLINK,
|
|
delay_on, delay_off);
|
|
}
|
|
|
|
static int create_gpio_led(const struct gpio_led *template,
|
|
struct gpio_led_data *led_dat, struct device *parent,
|
|
int (*blink_set)(struct gpio_desc *, int, unsigned long *,
|
|
unsigned long *))
|
|
{
|
|
int ret, state;
|
|
|
|
led_dat->gpiod = template->gpiod;
|
|
if (!led_dat->gpiod) {
|
|
/*
|
|
* This is the legacy code path for platform code that
|
|
* still uses GPIO numbers. Ultimately we would like to get
|
|
* rid of this block completely.
|
|
*/
|
|
unsigned long flags = 0;
|
|
|
|
/* skip leds that aren't available */
|
|
if (!gpio_is_valid(template->gpio)) {
|
|
dev_info(parent, "Skipping unavailable LED gpio %d (%s)\n",
|
|
template->gpio, template->name);
|
|
return 0;
|
|
}
|
|
|
|
if (template->active_low)
|
|
flags |= GPIOF_ACTIVE_LOW;
|
|
|
|
ret = devm_gpio_request_one(parent, template->gpio, flags,
|
|
template->name);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
led_dat->gpiod = gpio_to_desc(template->gpio);
|
|
if (IS_ERR(led_dat->gpiod))
|
|
return PTR_ERR(led_dat->gpiod);
|
|
}
|
|
|
|
led_dat->cdev.name = template->name;
|
|
led_dat->cdev.default_trigger = template->default_trigger;
|
|
led_dat->can_sleep = gpiod_cansleep(led_dat->gpiod);
|
|
led_dat->blinking = 0;
|
|
if (blink_set) {
|
|
led_dat->platform_gpio_blink_set = blink_set;
|
|
led_dat->cdev.blink_set = gpio_blink_set;
|
|
}
|
|
led_dat->cdev.brightness_set = gpio_led_set;
|
|
if (template->default_state == LEDS_GPIO_DEFSTATE_KEEP)
|
|
state = !!gpiod_get_value_cansleep(led_dat->gpiod);
|
|
else
|
|
state = (template->default_state == LEDS_GPIO_DEFSTATE_ON);
|
|
led_dat->cdev.brightness = state ? LED_FULL : LED_OFF;
|
|
if (!template->retain_state_suspended)
|
|
led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
|
|
|
|
ret = gpiod_direction_output(led_dat->gpiod, state);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
INIT_WORK(&led_dat->work, gpio_led_work);
|
|
|
|
return led_classdev_register(parent, &led_dat->cdev);
|
|
}
|
|
|
|
static void delete_gpio_led(struct gpio_led_data *led)
|
|
{
|
|
led_classdev_unregister(&led->cdev);
|
|
cancel_work_sync(&led->work);
|
|
}
|
|
|
|
struct gpio_leds_priv {
|
|
int num_leds;
|
|
struct gpio_led_data leds[];
|
|
};
|
|
|
|
static inline int sizeof_gpio_leds_priv(int num_leds)
|
|
{
|
|
return sizeof(struct gpio_leds_priv) +
|
|
(sizeof(struct gpio_led_data) * num_leds);
|
|
}
|
|
|
|
static struct gpio_leds_priv *gpio_leds_create(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct fwnode_handle *child;
|
|
struct gpio_leds_priv *priv;
|
|
int count, ret;
|
|
struct device_node *np;
|
|
|
|
count = device_get_child_node_count(dev);
|
|
if (!count)
|
|
return ERR_PTR(-ENODEV);
|
|
|
|
priv = devm_kzalloc(dev, sizeof_gpio_leds_priv(count), GFP_KERNEL);
|
|
if (!priv)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
device_for_each_child_node(dev, child) {
|
|
struct gpio_led led = {};
|
|
const char *state = NULL;
|
|
|
|
led.gpiod = devm_get_gpiod_from_child(dev, child);
|
|
if (IS_ERR(led.gpiod)) {
|
|
fwnode_handle_put(child);
|
|
ret = PTR_ERR(led.gpiod);
|
|
goto err;
|
|
}
|
|
|
|
np = of_node(child);
|
|
|
|
if (fwnode_property_present(child, "label")) {
|
|
fwnode_property_read_string(child, "label", &led.name);
|
|
} else {
|
|
if (IS_ENABLED(CONFIG_OF) && !led.name && np)
|
|
led.name = np->name;
|
|
if (!led.name)
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
fwnode_property_read_string(child, "linux,default-trigger",
|
|
&led.default_trigger);
|
|
|
|
if (!fwnode_property_read_string(child, "default-state",
|
|
&state)) {
|
|
if (!strcmp(state, "keep"))
|
|
led.default_state = LEDS_GPIO_DEFSTATE_KEEP;
|
|
else if (!strcmp(state, "on"))
|
|
led.default_state = LEDS_GPIO_DEFSTATE_ON;
|
|
else
|
|
led.default_state = LEDS_GPIO_DEFSTATE_OFF;
|
|
}
|
|
|
|
if (fwnode_property_present(child, "retain-state-suspended"))
|
|
led.retain_state_suspended = 1;
|
|
|
|
ret = create_gpio_led(&led, &priv->leds[priv->num_leds++],
|
|
dev, NULL);
|
|
if (ret < 0) {
|
|
fwnode_handle_put(child);
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
return priv;
|
|
|
|
err:
|
|
for (count = priv->num_leds - 2; count >= 0; count--)
|
|
delete_gpio_led(&priv->leds[count]);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
static const struct of_device_id of_gpio_leds_match[] = {
|
|
{ .compatible = "gpio-leds", },
|
|
{},
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, of_gpio_leds_match);
|
|
|
|
static int gpio_led_probe(struct platform_device *pdev)
|
|
{
|
|
struct gpio_led_platform_data *pdata = dev_get_platdata(&pdev->dev);
|
|
struct gpio_leds_priv *priv;
|
|
int i, ret = 0;
|
|
|
|
if (pdata && pdata->num_leds) {
|
|
priv = devm_kzalloc(&pdev->dev,
|
|
sizeof_gpio_leds_priv(pdata->num_leds),
|
|
GFP_KERNEL);
|
|
if (!priv)
|
|
return -ENOMEM;
|
|
|
|
priv->num_leds = pdata->num_leds;
|
|
for (i = 0; i < priv->num_leds; i++) {
|
|
ret = create_gpio_led(&pdata->leds[i],
|
|
&priv->leds[i],
|
|
&pdev->dev, pdata->gpio_blink_set);
|
|
if (ret < 0) {
|
|
/* On failure: unwind the led creations */
|
|
for (i = i - 1; i >= 0; i--)
|
|
delete_gpio_led(&priv->leds[i]);
|
|
return ret;
|
|
}
|
|
}
|
|
} else {
|
|
priv = gpio_leds_create(pdev);
|
|
if (IS_ERR(priv))
|
|
return PTR_ERR(priv);
|
|
}
|
|
|
|
platform_set_drvdata(pdev, priv);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int gpio_led_remove(struct platform_device *pdev)
|
|
{
|
|
struct gpio_leds_priv *priv = platform_get_drvdata(pdev);
|
|
int i;
|
|
|
|
for (i = 0; i < priv->num_leds; i++)
|
|
delete_gpio_led(&priv->leds[i]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver gpio_led_driver = {
|
|
.probe = gpio_led_probe,
|
|
.remove = gpio_led_remove,
|
|
.driver = {
|
|
.name = "leds-gpio",
|
|
.of_match_table = of_gpio_leds_match,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(gpio_led_driver);
|
|
|
|
MODULE_AUTHOR("Raphael Assenat <raph@8d.com>, Trent Piepho <tpiepho@freescale.com>");
|
|
MODULE_DESCRIPTION("GPIO LED driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:leds-gpio");
|