arcnet: com20020-pci: add led trigger support

The EAE PLX-PCI card has special leds on the the main io pci resource
bar. This patch adds support to trigger the conflict and data leds with
the packages.

Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>

5 files changed, 181 insertions, 0 deletions

diff --git a/drivers/net/arcnet/arcdevice.h b/drivers/net/arcnet/arcdevice.h
index d7fdea11e694..2edc0c0ab7c7 100644
--- a/drivers/net/arcnet/arcdevice.h
+++ b/drivers/net/arcnet/arcdevice.h
@@ -237,6 +237,8 @@ struct Outgoing {
                 numsegs;        /* number of segments */
 };
 
+#define ARCNET_LED_NAME_SZ (IFNAMSIZ + 6)
+
 struct arcnet_local {
         uint8_t config,         /* current value of CONFIG register */
                 timeout,        /* Extended timeout for COM20020 */
@@ -260,6 +262,11 @@ struct arcnet_local {
         /* On preemtive and SMB a lock is needed */
         spinlock_t lock;
 
+        struct led_trigger *tx_led_trig;
+        char tx_led_trig_name[ARCNET_LED_NAME_SZ];
+        struct led_trigger *recon_led_trig;
+        char recon_led_trig_name[ARCNET_LED_NAME_SZ];
+
         /*
          * Buffer management: an ARCnet card has 4 x 512-byte buffers, each of
          * which can be used for either sending or receiving.  The new dynamic
@@ -309,6 +316,8 @@ struct arcnet_local {
                 int (*reset)(struct net_device *dev, int really_reset);
                 void (*open)(struct net_device *dev);
                 void (*close)(struct net_device *dev);
+                void (*datatrigger) (struct net_device * dev, int enable);
+                void (*recontrigger) (struct net_device * dev, int enable);
 
                 void (*copy_to_card)(struct net_device *dev, int bufnum,
                                      int offset, void *buf, int count);
@@ -319,6 +328,16 @@ struct arcnet_local {
         void __iomem *mem_start;        /* pointer to ioremap'ed MMIO */
 };
 
+enum arcnet_led_event {
+        ARCNET_LED_EVENT_RECON,
+        ARCNET_LED_EVENT_OPEN,
+        ARCNET_LED_EVENT_STOP,
+        ARCNET_LED_EVENT_TX,
+};
+
+void arcnet_led_event(struct net_device *netdev, enum arcnet_led_event event);
+void devm_arcnet_led_init(struct net_device *netdev, int index, int subid);
+
 #if ARCNET_DEBUG_MAX & D_SKB
 void arcnet_dump_skb(struct net_device *dev, struct sk_buff *skb, char *desc);
 #else
diff --git a/drivers/net/arcnet/arcnet.c b/drivers/net/arcnet/arcnet.c
index 542e2b46b9eb..4242522ae86b 100644
--- a/drivers/net/arcnet/arcnet.c
+++ b/drivers/net/arcnet/arcnet.c
@@ -52,6 +52,8 @@
 #include <linux/init.h>
 #include <linux/jiffies.h>
 
+#include <linux/leds.h>
+
 #include "arcdevice.h"
 #include "com9026.h"
 
@@ -189,6 +191,71 @@ static void arcnet_dump_packet(struct net_device *dev, int bufnum,
 
 #endif
 
+/* Trigger a LED event in response to a ARCNET device event */
+void arcnet_led_event(struct net_device *dev, enum arcnet_led_event event)
+{
+        struct arcnet_local *lp = netdev_priv(dev);
+        unsigned long led_delay = 350;
+        unsigned long tx_delay = 50;
+
+        switch (event) {
+        case ARCNET_LED_EVENT_RECON:
+                led_trigger_blink_oneshot(lp->recon_led_trig,
+                                          &led_delay, &led_delay, 0);
+                break;
+        case ARCNET_LED_EVENT_OPEN:
+                led_trigger_event(lp->tx_led_trig, LED_OFF);
+                led_trigger_event(lp->recon_led_trig, LED_OFF);
+                break;
+        case ARCNET_LED_EVENT_STOP:
+                led_trigger_event(lp->tx_led_trig, LED_OFF);
+                led_trigger_event(lp->recon_led_trig, LED_OFF);
+                break;
+        case ARCNET_LED_EVENT_TX:
+                led_trigger_blink_oneshot(lp->tx_led_trig,
+                                          &tx_delay, &tx_delay, 0);
+                break;
+        }
+}
+EXPORT_SYMBOL_GPL(arcnet_led_event);
+
+static void arcnet_led_release(struct device *gendev, void *res)
+{
+        struct arcnet_local *lp = netdev_priv(to_net_dev(gendev));
+
+        led_trigger_unregister_simple(lp->tx_led_trig);
+        led_trigger_unregister_simple(lp->recon_led_trig);
+}
+
+/* Register ARCNET LED triggers for a arcnet device
+ *
+ * This is normally called from a driver's probe function
+ */
+void devm_arcnet_led_init(struct net_device *netdev, int index, int subid)
+{
+        struct arcnet_local *lp = netdev_priv(netdev);
+        void *res;
+
+        res = devres_alloc(arcnet_led_release, 0, GFP_KERNEL);
+        if (!res) {
+                netdev_err(netdev, "cannot register LED triggers\n");
+                return;
+        }
+
+        snprintf(lp->tx_led_trig_name, sizeof(lp->tx_led_trig_name),
+                 "arc%d-%d-tx", index, subid);
+        snprintf(lp->recon_led_trig_name, sizeof(lp->recon_led_trig_name),
+                 "arc%d-%d-recon", index, subid);
+
+        led_trigger_register_simple(lp->tx_led_trig_name,
+                                    &lp->tx_led_trig);
+        led_trigger_register_simple(lp->recon_led_trig_name,
+                                    &lp->recon_led_trig);
+
+        devres_add(&netdev->dev, res);
+}
+EXPORT_SYMBOL_GPL(devm_arcnet_led_init);
+
 /* Unregister a protocol driver from the arc_proto_map.  Protocol drivers
  * are responsible for registering themselves, but the unregister routine
  * is pretty generic so we'll do it here.
@@ -425,6 +492,7 @@ int arcnet_open(struct net_device *dev)
 
         netif_start_queue(dev);
 
+        arcnet_led_event(dev, ARCNET_LED_EVENT_OPEN);
         return 0;
 
  out_module_put:
@@ -438,6 +506,7 @@ int arcnet_close(struct net_device *dev)
 {
         struct arcnet_local *lp = netdev_priv(dev);
 
+        arcnet_led_event(dev, ARCNET_LED_EVENT_STOP);
         netif_stop_queue(dev);
 
         /* flush TX and disable RX */
@@ -585,6 +654,8 @@ netdev_tx_t arcnet_send_packet(struct sk_buff *skb,
         arc_printk(D_DEBUG, dev, "%s: %d: %s, status: %x\n",
                    __FILE__, __LINE__, __func__, lp->hw.status(dev));
 
+        arcnet_led_event(dev, ARCNET_LED_EVENT_TX);
+
         spin_unlock_irqrestore(&lp->lock, flags);
         return retval;          /* no need to try again */
 }
@@ -837,6 +908,7 @@ irqreturn_t arcnet_interrupt(int irq, void *dev_id)
 
                         arc_printk(D_RECON, dev, "Network reconfiguration detected (status=%Xh)\n",
                                    status);
+                        arcnet_led_event(dev, ARCNET_LED_EVENT_RECON);
                         /* MYRECON bit is at bit 7 of diagstatus */
                         if (diagstatus & 0x80)
                                 arc_printk(D_RECON, dev, "Put out that recon myself\n");
diff --git a/drivers/net/arcnet/com20020-pci.c b/drivers/net/arcnet/com20020-pci.c
index 637a6110cec6..239de38fbd6a 100644
--- a/drivers/net/arcnet/com20020-pci.c
+++ b/drivers/net/arcnet/com20020-pci.c
@@ -41,6 +41,7 @@
 #include <linux/pci.h>
 #include <linux/list.h>
 #include <linux/io.h>
+#include <linux/leds.h>
 
 #include "arcdevice.h"
 #include "com20020.h"
@@ -62,6 +63,36 @@ module_param(clockp, int, 0);
 module_param(clockm, int, 0);
 MODULE_LICENSE("GPL");
 
+static void led_tx_set(struct led_classdev *led_cdev,
+                             enum led_brightness value)
+{
+        struct com20020_dev *card;
+        struct com20020_priv *priv;
+        struct com20020_pci_card_info *ci;
+
+        card = container_of(led_cdev, struct com20020_dev, tx_led);
+
+        priv = card->pci_priv;
+        ci = priv->ci;
+
+        outb(!!value, priv->misc + ci->leds[card->index].green);
+}
+
+static void led_recon_set(struct led_classdev *led_cdev,
+                             enum led_brightness value)
+{
+        struct com20020_dev *card;
+        struct com20020_priv *priv;
+        struct com20020_pci_card_info *ci;
+
+        card = container_of(led_cdev, struct com20020_dev, recon_led);
+
+        priv = card->pci_priv;
+        ci = priv->ci;
+
+        outb(!!value, priv->misc + ci->leds[card->index].red);
+}
+
 static void com20020pci_remove(struct pci_dev *pdev);
 
 static int com20020pci_probe(struct pci_dev *pdev,
@@ -170,14 +201,41 @@ static int com20020pci_probe(struct pci_dev *pdev,
 
                 card->index = i;
                 card->pci_priv = priv;
+                card->tx_led.brightness_set = led_tx_set;
+                card->tx_led.default_trigger = devm_kasprintf(&pdev->dev,
+                                                GFP_KERNEL, "arc%d-%d-tx",
+                                                dev->dev_id, i);
+                card->tx_led.name = devm_kasprintf(&pdev->dev, GFP_KERNEL,
+                                                "pci:green:tx:%d-%d",
+                                                dev->dev_id, i);
+
+                card->tx_led.dev = &dev->dev;
+                card->recon_led.brightness_set = led_recon_set;
+                card->recon_led.default_trigger = devm_kasprintf(&pdev->dev,
+                                                GFP_KERNEL, "arc%d-%d-recon",
+                                                dev->dev_id, i);
+                card->recon_led.name = devm_kasprintf(&pdev->dev, GFP_KERNEL,
+                                                "pci:red:recon:%d-%d",
+                                                dev->dev_id, i);
+                card->recon_led.dev = &dev->dev;
                 card->dev = dev;
 
+                ret = devm_led_classdev_register(&pdev->dev, &card->tx_led);
+                if (ret)
+                        goto out_port;
+
+                ret = devm_led_classdev_register(&pdev->dev, &card->recon_led);
+                if (ret)
+                        goto out_port;
+
                 dev_set_drvdata(&dev->dev, card);
 
                 ret = com20020_found(dev, IRQF_SHARED);
                 if (ret)
                         goto out_port;
 
+                devm_arcnet_led_init(dev, dev->dev_id, i);
+
                 list_add(&card->list, &priv->list_dev);
         }
 
@@ -261,6 +319,12 @@ static struct com20020_pci_card_info card_info_eae_arc1 = {
                 .offset = 0x10,
                 .size = 0x04,
         },
+        .leds = {
+                {
+                        .green = 0x0,
+                        .red = 0x1,
+                },
+        },
         .rotary = 0x0,
         .flags = ARC_CAN_10MBIT,
 };
@@ -284,6 +348,15 @@ static struct com20020_pci_card_info card_info_eae_ma1 = {
                 .offset = 0x10,
                 .size = 0x04,
         },
+        .leds = {
+                {
+                        .green = 0x0,
+                        .red = 0x1,
+                }, {
+                        .green = 0x2,
+                        .red = 0x3,
+                },
+        },
         .rotary = 0x0,
         .flags = ARC_CAN_10MBIT,
 };
diff --git a/drivers/net/arcnet/com20020.h b/drivers/net/arcnet/com20020.h
index f2ed2eff3ae3..0bcc5d0a6903 100644
--- a/drivers/net/arcnet/com20020.h
+++ b/drivers/net/arcnet/com20020.h
@@ -26,6 +26,7 @@
  */
 #ifndef __COM20020_H
 #define __COM20020_H
+#include <linux/leds.h>
 
 int com20020_check(struct net_device *dev);
 int com20020_found(struct net_device *dev, int shared);
@@ -36,6 +37,11 @@ extern const struct net_device_ops com20020_netdev_ops;
 
 #define PLX_PCI_MAX_CARDS 2
 
+struct ledoffsets {
+        int green;
+        int red;
+};
+
 struct com20020_pci_channel_map {
         u32 bar;
         u32 offset;
@@ -49,6 +55,7 @@ struct com20020_pci_card_info {
         struct com20020_pci_channel_map chan_map_tbl[PLX_PCI_MAX_CARDS];
         struct com20020_pci_channel_map misc_map;
 
+        struct ledoffsets leds[PLX_PCI_MAX_CARDS];
         int rotary;
 
         unsigned int flags;
@@ -64,6 +71,9 @@ struct com20020_dev {
         struct list_head list;
         struct net_device *dev;
 
+        struct led_classdev tx_led;
+        struct led_classdev recon_led;
+
         struct com20020_priv *pci_priv;
         int index;
 };
diff --git a/include/linux/leds.h b/include/linux/leds.h
index b122eeafb5dc..fa359c79c825 100644
--- a/include/linux/leds.h
+++ b/include/linux/leds.h
@@ -283,6 +283,13 @@ static inline void led_trigger_register_simple(const char *name,
 static inline void led_trigger_unregister_simple(struct led_trigger *trigger) {}
 static inline void led_trigger_event(struct led_trigger *trigger,
                                 enum led_brightness event) {}
+static inline void led_trigger_blink(struct led_trigger *trigger,
+                                      unsigned long *delay_on,
+                                      unsigned long *delay_off) {}
+static inline void led_trigger_blink_oneshot(struct led_trigger *trigger,
+                                      unsigned long *delay_on,
+                                      unsigned long *delay_off,
+                                      int invert) {}
 static inline void led_trigger_set_default(struct led_classdev *led_cdev) {}
 static inline void led_trigger_set(struct led_classdev *led_cdev,
                                 struct led_trigger *trigger) {}