leds.c

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/*
 * Linux LED driver for RTL8187
 *
 * Copyright 2009 Larry Finger <[email protected]>
 *
 * Based on the LED handling in the r8187 driver, which is:
 * Copyright (c) Realtek Semiconductor Corp. All rights reserved.
 *
 * Thanks to Realtek for their support!
 *
 * 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.
 */

#ifdef CONFIG_RTL8187_LEDS

#include <net/mac80211.h>
#include <linux/usb.h>
#include <linux/eeprom_93cx6.h>

#include "rtl8187.h"
#include "leds.h"

static void led_turn_on(struct work_struct *work)
{
    /* As this routine does read/write operations on the hardware, it must
     * be run from a work queue.
     */
    u8 reg;
    struct rtl8187_priv *priv = container_of(work, struct rtl8187_priv,
                    led_on.work);
    struct rtl8187_led *led = &priv->led_tx;

    /* Don't change the LED, when the device is down. */
    if (!priv->vif || priv->vif->type == NL80211_IFTYPE_UNSPECIFIED)
        return ;

    /* Skip if the LED is not registered. */
    if (!led->dev)
        return;
    mutex_lock(&priv->conf_mutex);
    switch (led->ledpin) {
    case LED_PIN_GPIO0:
        rtl818x_iowrite8(priv, &priv->map->GPIO0, 0x01);
        rtl818x_iowrite8(priv, &priv->map->GP_ENABLE, 0x00);
        break;
    case LED_PIN_LED0:
        reg = rtl818x_ioread8(priv, &priv->map->PGSELECT) & ~(1 << 4);
        rtl818x_iowrite8(priv, &priv->map->PGSELECT, reg);
        break;
    case LED_PIN_LED1:
        reg = rtl818x_ioread8(priv, &priv->map->PGSELECT) & ~(1 << 5);
        rtl818x_iowrite8(priv, &priv->map->PGSELECT, reg);
        break;
    case LED_PIN_HW:
    default:
        break;
    }
    mutex_unlock(&priv->conf_mutex);
}

static void led_turn_off(struct work_struct *work)
{
    /* As this routine does read/write operations on the hardware, it must
     * be run from a work queue.
     */
    u8 reg;
    struct rtl8187_priv *priv = container_of(work, struct rtl8187_priv,
                    led_off.work);
    struct rtl8187_led *led = &priv->led_tx;

    /* Don't change the LED, when the device is down. */
    if (!priv->vif || priv->vif->type == NL80211_IFTYPE_UNSPECIFIED)
        return ;

    /* Skip if the LED is not registered. */
    if (!led->dev)
        return;
    mutex_lock(&priv->conf_mutex);
    switch (led->ledpin) {
    case LED_PIN_GPIO0:
        rtl818x_iowrite8(priv, &priv->map->GPIO0, 0x01);
        rtl818x_iowrite8(priv, &priv->map->GP_ENABLE, 0x01);
        break;
    case LED_PIN_LED0:
        reg = rtl818x_ioread8(priv, &priv->map->PGSELECT) | (1 << 4);
        rtl818x_iowrite8(priv, &priv->map->PGSELECT, reg);
        break;
    case LED_PIN_LED1:
        reg = rtl818x_ioread8(priv, &priv->map->PGSELECT) | (1 << 5);
        rtl818x_iowrite8(priv, &priv->map->PGSELECT, reg);
        break;
    case LED_PIN_HW:
    default:
        break;
    }
    mutex_unlock(&priv->conf_mutex);
}

/* Callback from the LED subsystem. */
static void rtl8187_led_brightness_set(struct led_classdev *led_dev,
                   enum led_brightness brightness)
{
    struct rtl8187_led *led = container_of(led_dev, struct rtl8187_led,
                           led_dev);
    struct ieee80211_hw *hw = led->dev;
    struct rtl8187_priv *priv;
    static bool radio_on;

    if (!hw)
        return;
    priv = hw->priv;
    if (led->is_radio) {
        if (brightness == LED_FULL) {
            ieee80211_queue_delayed_work(hw, &priv->led_on, 0);
            radio_on = true;
        } else if (radio_on) {
            radio_on = false;
            cancel_delayed_work(&priv->led_on);
            ieee80211_queue_delayed_work(hw, &priv->led_off, 0);
        }
    } else if (radio_on) {
        if (brightness == LED_OFF) {
            ieee80211_queue_delayed_work(hw, &priv->led_off, 0);
            /* The LED is off for 1/20 sec - it just blinks. */
            ieee80211_queue_delayed_work(hw, &priv->led_on,
                             HZ / 20);
        } else
            ieee80211_queue_delayed_work(hw, &priv->led_on, 0);
    }
}

static int rtl8187_register_led(struct ieee80211_hw *dev,
                struct rtl8187_led *led, const char *name,
                const char *default_trigger, u8 ledpin,
                bool is_radio)
{
    int err;
    struct rtl8187_priv *priv = dev->priv;

    if (led->dev)
        return -EEXIST;
    if (!default_trigger)
        return -EINVAL;
    led->dev = dev;
    led->ledpin = ledpin;
    led->is_radio = is_radio;
    strncpy(led->name, name, sizeof(led->name));

    led->led_dev.name = led->name;
    led->led_dev.default_trigger = default_trigger;
    led->led_dev.brightness_set = rtl8187_led_brightness_set;

    err = led_classdev_register(&priv->udev->dev, &led->led_dev);
    if (err) {
        printk(KERN_INFO "LEDs: Failed to register %s\n", name);
        led->dev = NULL;
        return err;
    }
    return 0;
}

static void rtl8187_unregister_led(struct rtl8187_led *led)
{
    struct ieee80211_hw *hw = led->dev;
    struct rtl8187_priv *priv = hw->priv;

    led_classdev_unregister(&led->led_dev);
    flush_delayed_work(&priv->led_off);
    led->dev = NULL;
}

void rtl8187_leds_init(struct ieee80211_hw *dev, u16 custid)
{
    struct rtl8187_priv *priv = dev->priv;
    char name[RTL8187_LED_MAX_NAME_LEN + 1];
    u8 ledpin;
    int err;

    /* According to the vendor driver, the LED operation depends on the
     * customer ID encoded in the EEPROM
     */
    printk(KERN_INFO "rtl8187: Customer ID is 0x%02X\n", custid);
    switch (custid) {
    case EEPROM_CID_RSVD0:
    case EEPROM_CID_RSVD1:
    case EEPROM_CID_SERCOMM_PS:
    case EEPROM_CID_QMI:
    case EEPROM_CID_DELL:
    case EEPROM_CID_TOSHIBA:
        ledpin = LED_PIN_GPIO0;
        break;
    case EEPROM_CID_ALPHA0:
        ledpin = LED_PIN_LED0;
        break;
    case EEPROM_CID_HW:
        ledpin = LED_PIN_HW;
        break;
    default:
        ledpin = LED_PIN_GPIO0;
    }

    INIT_DELAYED_WORK(&priv->led_on, led_turn_on);
    INIT_DELAYED_WORK(&priv->led_off, led_turn_off);

    snprintf(name, sizeof(name),
         "rtl8187-%s::radio", wiphy_name(dev->wiphy));
    err = rtl8187_register_led(dev, &priv->led_radio, name,
             ieee80211_get_radio_led_name(dev), ledpin, true);
    if (err)
        return;

    snprintf(name, sizeof(name),
         "rtl8187-%s::tx", wiphy_name(dev->wiphy));
    err = rtl8187_register_led(dev, &priv->led_tx, name,
             ieee80211_get_tx_led_name(dev), ledpin, false);
    if (err)
        goto err_tx;

    snprintf(name, sizeof(name),
         "rtl8187-%s::rx", wiphy_name(dev->wiphy));
    err = rtl8187_register_led(dev, &priv->led_rx, name,
             ieee80211_get_rx_led_name(dev), ledpin, false);
    if (!err)
        return;

    /* registration of RX LED failed - unregister */
    rtl8187_unregister_led(&priv->led_tx);
err_tx:
    rtl8187_unregister_led(&priv->led_radio);
}

void rtl8187_leds_exit(struct ieee80211_hw *dev)
{
    struct rtl8187_priv *priv = dev->priv;

    rtl8187_unregister_led(&priv->led_radio);
    rtl8187_unregister_led(&priv->led_rx);
    rtl8187_unregister_led(&priv->led_tx);
    cancel_delayed_work_sync(&priv->led_off);
    cancel_delayed_work_sync(&priv->led_on);
}
#endif /* def CONFIG_RTL8187_LEDS */