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linux/drivers/net/wireless/rtl818x/rtl8187_leds.c
Luis R. Rodriguez 42935ecaf4 mac80211: redefine usage of the mac80211 workqueue 
The mac80211 workqueue exists to enable mac80211 and drivers
to queue their own work on a single threaded workqueue. mac80211
takes care to flush the workqueue during suspend but we never
really had requirements on drivers for how they should use
the workqueue in consideration for suspend.

We extend mac80211 to document how the mac80211 workqueue should
be used, how it should not be used and finally move raw access to
the workqueue to mac80211 only. Drivers and mac80211 use helpers
to queue work onto the mac80211 workqueue:

  * ieee80211_queue_work()
  * ieee80211_queue_delayed_work()

These helpers will now warn if mac80211 already completed its
suspend cycle and someone is trying to queue work. mac80211
flushes the mac80211 workqueue prior to suspend a few times,
but we haven't taken the care to ensure drivers won't add more
work after suspend. To help with this we add a warning when
someone tries to add work and mac80211 already completed the
suspend cycle.

Drivers should ensure they cancel any work or delayed work
in the mac80211 stop() callback.

Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-08-04 16:44:14 -04:00

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/*
* Linux LED driver for RTL8187
*
* Copyright 2009 Larry Finger <Larry.Finger@lwfinger.net>
*
* 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 "rtl8187_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->mode == 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->GPIO, 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->mode == 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->GPIO, 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 = hw->priv;
if (brightness == LED_OFF) {
ieee80211_queue_delayed_work(hw, &priv->led_off, 0);
/* The LED is off for 1/20 sec so that 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)
{
int err;
struct rtl8187_priv *priv = dev->priv;
if (led->dev)
return -EEXIST;
if (!default_trigger)
return -EINVAL;
led->dev = dev;
led->ledpin = ledpin;
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)
{
led_classdev_unregister(&led->led_dev);
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::tx", wiphy_name(dev->wiphy));
err = rtl8187_register_led(dev, &priv->led_tx, name,
ieee80211_get_tx_led_name(dev), ledpin);
if (err)
goto error;
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);
if (!err) {
ieee80211_queue_delayed_work(dev, &priv->led_on, 0);
return;
}
/* registration of RX LED failed - unregister TX */
rtl8187_unregister_led(&priv->led_tx);
error:
/* If registration of either failed, cancel delayed work */
cancel_delayed_work_sync(&priv->led_off);
cancel_delayed_work_sync(&priv->led_on);
}
void rtl8187_leds_exit(struct ieee80211_hw *dev)
{
struct rtl8187_priv *priv = dev->priv;
/* turn the LED off before exiting */
ieee80211_queue_delayed_work(dev, &priv->led_off, 0);
cancel_delayed_work_sync(&priv->led_off);
cancel_delayed_work_sync(&priv->led_on);
rtl8187_unregister_led(&priv->led_rx);
rtl8187_unregister_led(&priv->led_tx);
}
#endif /* def CONFIG_RTL8187_LED */
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