linux/drivers/net/wireless/iwlwifi/iwl-led.c
Johannes Berg e932a609e9 iwlwifi: LED cleanup
The iwlwifi drivers have LED blinking requirements that
mac80211 cannot fulfill due to the use of just a single
LED instead of different ones for TX, RX, radio etc.
Instead, the single LED blinks according to transfers
and is solid on the rest of the time. As such, having
LED class devices registered that mac80211 triggers are
connected to is pointless as we don't use the triggers
anyway.

Remove all the useless code and add hooks into the
driver itself. At the same time, make the LED code
abstracted so the core code that determines blink rate
etc. can be shared between 3945 and agn in iwlcore.

At the same time, the fact that we removed the use of
the mac80211 LED triggers means we can also remove the
IWLWIFI_LEDS Kconfig symbol since the LED support is
now self-contained.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-10-07 16:39:45 -04:00

227 lines
5.9 KiB
C

/******************************************************************************
*
* Copyright(c) 2003 - 2009 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
*
* The full GNU General Public License is included in this distribution in the
* file called LICENSE.
*
* Contact Information:
* Intel Linux Wireless <ilw@linux.intel.com>
* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
*
*****************************************************************************/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/dma-mapping.h>
#include <linux/delay.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/wireless.h>
#include <net/mac80211.h>
#include <linux/etherdevice.h>
#include <asm/unaligned.h>
#include "iwl-dev.h"
#include "iwl-core.h"
#include "iwl-io.h"
/* default: IWL_LED_BLINK(0) using blinking index table */
static int led_mode;
module_param(led_mode, int, S_IRUGO);
MODULE_PARM_DESC(led_mode, "led mode: 0=blinking, 1=On(RF On)/Off(RF Off), "
"(default 0)\n");
static const struct {
u16 tpt; /* Mb/s */
u8 on_time;
u8 off_time;
} blink_tbl[] =
{
{300, 25, 25},
{200, 40, 40},
{100, 55, 55},
{70, 65, 65},
{50, 75, 75},
{20, 85, 85},
{10, 95, 95},
{5, 110, 110},
{1, 130, 130},
{0, 167, 167},
/* SOLID_ON */
{-1, IWL_LED_SOLID, 0}
};
#define IWL_1MB_RATE (128 * 1024)
#define IWL_LED_THRESHOLD (16)
#define IWL_MAX_BLINK_TBL (ARRAY_SIZE(blink_tbl) - 1) /* exclude SOLID_ON */
#define IWL_SOLID_BLINK_IDX (ARRAY_SIZE(blink_tbl) - 1)
/*
* Adjust led blink rate to compensate on a MAC Clock difference on every HW
* Led blink rate analysis showed an average deviation of 0% on 3945,
* 5% on 4965 HW and 20% on 5000 series and up.
* Need to compensate on the led on/off time per HW according to the deviation
* to achieve the desired led frequency
* The calculation is: (100-averageDeviation)/100 * blinkTime
* For code efficiency the calculation will be:
* compensation = (100 - averageDeviation) * 64 / 100
* NewBlinkTime = (compensation * BlinkTime) / 64
*/
static inline u8 iwl_blink_compensation(struct iwl_priv *priv,
u8 time, u16 compensation)
{
if (!compensation) {
IWL_ERR(priv, "undefined blink compensation: "
"use pre-defined blinking time\n");
return time;
}
return (u8)((time * compensation) >> 6);
}
/* Set led pattern command */
static int iwl_led_pattern(struct iwl_priv *priv, unsigned int idx)
{
struct iwl_led_cmd led_cmd = {
.id = IWL_LED_LINK,
.interval = IWL_DEF_LED_INTRVL
};
BUG_ON(idx > IWL_MAX_BLINK_TBL);
IWL_DEBUG_LED(priv, "Led blink time compensation= %u\n",
priv->cfg->led_compensation);
led_cmd.on =
iwl_blink_compensation(priv, blink_tbl[idx].on_time,
priv->cfg->led_compensation);
led_cmd.off =
iwl_blink_compensation(priv, blink_tbl[idx].off_time,
priv->cfg->led_compensation);
return priv->cfg->ops->led->cmd(priv, &led_cmd);
}
int iwl_led_start(struct iwl_priv *priv)
{
return priv->cfg->ops->led->on(priv);
}
EXPORT_SYMBOL(iwl_led_start);
int iwl_led_associate(struct iwl_priv *priv)
{
IWL_DEBUG_LED(priv, "Associated\n");
if (led_mode == IWL_LED_BLINK)
priv->allow_blinking = 1;
priv->last_blink_time = jiffies;
return 0;
}
int iwl_led_disassociate(struct iwl_priv *priv)
{
priv->allow_blinking = 0;
return 0;
}
/*
* calculate blink rate according to last second Tx/Rx activities
*/
static int iwl_get_blink_rate(struct iwl_priv *priv)
{
int i;
/* count both tx and rx traffic to be able to
* handle traffic in either direction
*/
u64 current_tpt = priv->tx_stats.data_bytes +
priv->rx_stats.data_bytes;
s64 tpt = current_tpt - priv->led_tpt;
if (tpt < 0) /* wraparound */
tpt = -tpt;
IWL_DEBUG_LED(priv, "tpt %lld current_tpt %llu\n",
(long long)tpt,
(unsigned long long)current_tpt);
priv->led_tpt = current_tpt;
if (!priv->allow_blinking)
i = IWL_MAX_BLINK_TBL;
else
for (i = 0; i < IWL_MAX_BLINK_TBL; i++)
if (tpt > (blink_tbl[i].tpt * IWL_1MB_RATE))
break;
IWL_DEBUG_LED(priv, "LED BLINK IDX=%d\n", i);
return i;
}
/*
* this function called from handler. Since setting Led command can
* happen very frequent we postpone led command to be called from
* REPLY handler so we know ucode is up
*/
void iwl_leds_background(struct iwl_priv *priv)
{
u8 blink_idx;
if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
priv->last_blink_time = 0;
return;
}
if (iwl_is_rfkill(priv)) {
priv->last_blink_time = 0;
return;
}
if (!priv->allow_blinking) {
priv->last_blink_time = 0;
if (priv->last_blink_rate != IWL_SOLID_BLINK_IDX) {
priv->last_blink_rate = IWL_SOLID_BLINK_IDX;
iwl_led_pattern(priv, IWL_SOLID_BLINK_IDX);
}
return;
}
if (!priv->last_blink_time ||
!time_after(jiffies, priv->last_blink_time +
msecs_to_jiffies(1000)))
return;
blink_idx = iwl_get_blink_rate(priv);
/* call only if blink rate change */
if (blink_idx != priv->last_blink_rate)
iwl_led_pattern(priv, blink_idx);
priv->last_blink_time = jiffies;
priv->last_blink_rate = blink_idx;
}
EXPORT_SYMBOL(iwl_leds_background);
void iwl_leds_init(struct iwl_priv *priv)
{
priv->last_blink_rate = 0;
priv->led_tpt = 0;
priv->last_blink_time = 0;
priv->allow_blinking = 0;
}
EXPORT_SYMBOL(iwl_leds_init);