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// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2024 Linutronix GmbH */
#include <linux/bits.h>
#include <linux/leds.h>
#include <linux/netdevice.h>
#include <linux/pm_runtime.h>
#include <uapi/linux/uleds.h>
#include "igc.h"
#define IGC_NUM_LEDS 3
#define IGC_LEDCTL_LED0_MODE_SHIFT 0
#define IGC_LEDCTL_LED0_MODE_MASK GENMASK(3, 0)
#define IGC_LEDCTL_LED0_BLINK BIT(7)
#define IGC_LEDCTL_LED1_MODE_SHIFT 8
#define IGC_LEDCTL_LED1_MODE_MASK GENMASK(11, 8)
#define IGC_LEDCTL_LED1_BLINK BIT(15)
#define IGC_LEDCTL_LED2_MODE_SHIFT 16
#define IGC_LEDCTL_LED2_MODE_MASK GENMASK(19, 16)
#define IGC_LEDCTL_LED2_BLINK BIT(23)
#define IGC_LEDCTL_MODE_ON 0x00
#define IGC_LEDCTL_MODE_OFF 0x01
#define IGC_LEDCTL_MODE_LINK_10 0x05
#define IGC_LEDCTL_MODE_LINK_100 0x06
#define IGC_LEDCTL_MODE_LINK_1000 0x07
#define IGC_LEDCTL_MODE_LINK_2500 0x08
#define IGC_LEDCTL_MODE_ACTIVITY 0x0b
#define IGC_SUPPORTED_MODES \
(BIT(TRIGGER_NETDEV_LINK_2500) | BIT(TRIGGER_NETDEV_LINK_1000) | \
BIT(TRIGGER_NETDEV_LINK_100) | BIT(TRIGGER_NETDEV_LINK_10) | \
BIT(TRIGGER_NETDEV_RX) | BIT(TRIGGER_NETDEV_TX))
#define IGC_ACTIVITY_MODES \
(BIT(TRIGGER_NETDEV_RX) | BIT(TRIGGER_NETDEV_TX))
struct igc_led_classdev {
struct net_device *netdev;
struct led_classdev led;
int index;
};
#define lcdev_to_igc_ldev(lcdev) \
container_of(lcdev, struct igc_led_classdev, led)
static void igc_led_select(struct igc_adapter *adapter, int led,
u32 *mask, u32 *shift, u32 *blink)
{
switch (led) {
case 0:
*mask = IGC_LEDCTL_LED0_MODE_MASK;
*shift = IGC_LEDCTL_LED0_MODE_SHIFT;
*blink = IGC_LEDCTL_LED0_BLINK;
break;
case 1:
*mask = IGC_LEDCTL_LED1_MODE_MASK;
*shift = IGC_LEDCTL_LED1_MODE_SHIFT;
*blink = IGC_LEDCTL_LED1_BLINK;
break;
case 2:
*mask = IGC_LEDCTL_LED2_MODE_MASK;
*shift = IGC_LEDCTL_LED2_MODE_SHIFT;
*blink = IGC_LEDCTL_LED2_BLINK;
break;
default:
*mask = *shift = *blink = 0;
netdev_err(adapter->netdev, "Unknown LED %d selected!\n", led);
}
}
static void igc_led_set(struct igc_adapter *adapter, int led, u32 mode,
bool blink)
{
u32 shift, mask, blink_bit, ledctl;
struct igc_hw *hw = &adapter->hw;
igc_led_select(adapter, led, &mask, &shift, &blink_bit);
pm_runtime_get_sync(&adapter->pdev->dev);
mutex_lock(&adapter->led_mutex);
/* Set mode */
ledctl = rd32(IGC_LEDCTL);
ledctl &= ~mask;
ledctl |= mode << shift;
/* Configure blinking */
if (blink)
ledctl |= blink_bit;
else
ledctl &= ~blink_bit;
wr32(IGC_LEDCTL, ledctl);
mutex_unlock(&adapter->led_mutex);
pm_runtime_put(&adapter->pdev->dev);
}
static u32 igc_led_get(struct igc_adapter *adapter, int led)
{
u32 shift, mask, blink_bit, ledctl;
struct igc_hw *hw = &adapter->hw;
igc_led_select(adapter, led, &mask, &shift, &blink_bit);
pm_runtime_get_sync(&adapter->pdev->dev);
mutex_lock(&adapter->led_mutex);
ledctl = rd32(IGC_LEDCTL);
mutex_unlock(&adapter->led_mutex);
pm_runtime_put(&adapter->pdev->dev);
return (ledctl & mask) >> shift;
}
static int igc_led_brightness_set_blocking(struct led_classdev *led_cdev,
enum led_brightness brightness)
{
struct igc_led_classdev *ldev = lcdev_to_igc_ldev(led_cdev);
struct igc_adapter *adapter = netdev_priv(ldev->netdev);
u32 mode;
if (brightness)
mode = IGC_LEDCTL_MODE_ON;
else
mode = IGC_LEDCTL_MODE_OFF;
netdev_dbg(adapter->netdev, "Set brightness for LED %d to mode %u!\n",
ldev->index, mode);
igc_led_set(adapter, ldev->index, mode, false);
return 0;
}
static int igc_led_hw_control_is_supported(struct led_classdev *led_cdev,
unsigned long flags)
{
if (flags & ~IGC_SUPPORTED_MODES)
return -EOPNOTSUPP;
/* If Tx and Rx selected, activity can be offloaded unless some other
* mode is selected as well.
*/
if ((flags & BIT(TRIGGER_NETDEV_TX)) &&
(flags & BIT(TRIGGER_NETDEV_RX)) &&
!(flags & ~IGC_ACTIVITY_MODES))
return 0;
/* Single Rx or Tx activity is not supported. */
if (flags & IGC_ACTIVITY_MODES)
return -EOPNOTSUPP;
/* Only one mode can be active at a given time. */
if (flags & (flags - 1))
return -EOPNOTSUPP;
return 0;
}
static int igc_led_hw_control_set(struct led_classdev *led_cdev,
unsigned long flags)
{
struct igc_led_classdev *ldev = lcdev_to_igc_ldev(led_cdev);
struct igc_adapter *adapter = netdev_priv(ldev->netdev);
u32 mode = IGC_LEDCTL_MODE_OFF;
bool blink = false;
if (flags & BIT(TRIGGER_NETDEV_LINK_10))
mode = IGC_LEDCTL_MODE_LINK_10;
if (flags & BIT(TRIGGER_NETDEV_LINK_100))
mode = IGC_LEDCTL_MODE_LINK_100;
if (flags & BIT(TRIGGER_NETDEV_LINK_1000))
mode = IGC_LEDCTL_MODE_LINK_1000;
if (flags & BIT(TRIGGER_NETDEV_LINK_2500))
mode = IGC_LEDCTL_MODE_LINK_2500;
if ((flags & BIT(TRIGGER_NETDEV_TX)) &&
(flags & BIT(TRIGGER_NETDEV_RX)))
mode = IGC_LEDCTL_MODE_ACTIVITY;
netdev_dbg(adapter->netdev, "Set HW control for LED %d to mode %u!\n",
ldev->index, mode);
/* blink is recommended for activity */
if (mode == IGC_LEDCTL_MODE_ACTIVITY)
blink = true;
igc_led_set(adapter, ldev->index, mode, blink);
return 0;
}
static int igc_led_hw_control_get(struct led_classdev *led_cdev,
unsigned long *flags)
{
struct igc_led_classdev *ldev = lcdev_to_igc_ldev(led_cdev);
struct igc_adapter *adapter = netdev_priv(ldev->netdev);
u32 mode;
mode = igc_led_get(adapter, ldev->index);
switch (mode) {
case IGC_LEDCTL_MODE_ACTIVITY:
*flags = BIT(TRIGGER_NETDEV_TX) | BIT(TRIGGER_NETDEV_RX);
break;
case IGC_LEDCTL_MODE_LINK_10:
*flags = BIT(TRIGGER_NETDEV_LINK_10);
break;
case IGC_LEDCTL_MODE_LINK_100:
*flags = BIT(TRIGGER_NETDEV_LINK_100);
break;
case IGC_LEDCTL_MODE_LINK_1000:
*flags = BIT(TRIGGER_NETDEV_LINK_1000);
break;
case IGC_LEDCTL_MODE_LINK_2500:
*flags = BIT(TRIGGER_NETDEV_LINK_2500);
break;
}
return 0;
}
static struct device *igc_led_hw_control_get_device(struct led_classdev *led_cdev)
{
struct igc_led_classdev *ldev = lcdev_to_igc_ldev(led_cdev);
return &ldev->netdev->dev;
}
static void igc_led_get_name(struct igc_adapter *adapter, int index, char *buf,
size_t buf_len)
{
snprintf(buf, buf_len, "igc-%x%x-led%d",
pci_domain_nr(adapter->pdev->bus),
pci_dev_id(adapter->pdev), index);
}
static void igc_setup_ldev(struct igc_led_classdev *ldev,
struct net_device *netdev, int index)
{
struct igc_adapter *adapter = netdev_priv(netdev);
struct led_classdev *led_cdev = &ldev->led;
char led_name[LED_MAX_NAME_SIZE];
ldev->netdev = netdev;
ldev->index = index;
igc_led_get_name(adapter, index, led_name, LED_MAX_NAME_SIZE);
led_cdev->name = led_name;
led_cdev->flags |= LED_RETAIN_AT_SHUTDOWN;
led_cdev->max_brightness = 1;
led_cdev->brightness_set_blocking = igc_led_brightness_set_blocking;
led_cdev->hw_control_trigger = "netdev";
led_cdev->hw_control_is_supported = igc_led_hw_control_is_supported;
led_cdev->hw_control_set = igc_led_hw_control_set;
led_cdev->hw_control_get = igc_led_hw_control_get;
led_cdev->hw_control_get_device = igc_led_hw_control_get_device;
devm_led_classdev_register(&netdev->dev, led_cdev);
}
int igc_led_setup(struct igc_adapter *adapter)
{
struct net_device *netdev = adapter->netdev;
struct device *dev = &netdev->dev;
struct igc_led_classdev *leds;
int i;
mutex_init(&adapter->led_mutex);
leds = devm_kcalloc(dev, IGC_NUM_LEDS, sizeof(*leds), GFP_KERNEL);
if (!leds)
return -ENOMEM;
for (i = 0; i < IGC_NUM_LEDS; i++)
igc_setup_ldev(leds + i, netdev, i);
return 0;
}
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