/******************************************************************************
*
* Copyright(c) 2003 - 2010 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->last_blink_time = 0;
priv->allow_blinking = 0;
}
EXPORT_SYMBOL(iwl_leds_init);
