230 lines
6.0 KiB
C
230 lines
6.0 KiB
C
/******************************************************************************
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*
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* Copyright(c) 2003 - 2010 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
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*
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* The full GNU General Public License is included in this distribution in the
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* file called LICENSE.
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*
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* Contact Information:
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* Intel Linux Wireless <ilw@linux.intel.com>
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* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
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*
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*****************************************************************************/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/pci.h>
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#include <linux/dma-mapping.h>
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#include <linux/delay.h>
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#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#include <linux/wireless.h>
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#include <net/mac80211.h>
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#include <linux/etherdevice.h>
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#include <asm/unaligned.h>
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#include "iwl-dev.h"
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#include "iwl-core.h"
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#include "iwl-io.h"
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/* default: IWL_LED_BLINK(0) using blinking index table */
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static int led_mode;
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module_param(led_mode, int, S_IRUGO);
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MODULE_PARM_DESC(led_mode, "0=system default, "
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"1=On(RF On)/Off(RF Off), 2=blinking");
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static const struct {
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u16 tpt; /* Mb/s */
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u8 on_time;
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u8 off_time;
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} blink_tbl[] =
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{
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{300, 25, 25},
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{200, 40, 40},
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{100, 55, 55},
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{70, 65, 65},
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{50, 75, 75},
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{20, 85, 85},
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{10, 95, 95},
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{5, 110, 110},
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{1, 130, 130},
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{0, 167, 167},
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/* SOLID_ON */
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{-1, IWL_LED_SOLID, 0}
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};
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#define IWL_1MB_RATE (128 * 1024)
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#define IWL_LED_THRESHOLD (16)
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#define IWL_MAX_BLINK_TBL (ARRAY_SIZE(blink_tbl) - 1) /* exclude SOLID_ON */
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#define IWL_SOLID_BLINK_IDX (ARRAY_SIZE(blink_tbl) - 1)
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/*
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* Adjust led blink rate to compensate on a MAC Clock difference on every HW
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* Led blink rate analysis showed an average deviation of 0% on 3945,
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* 5% on 4965 HW and 20% on 5000 series and up.
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* Need to compensate on the led on/off time per HW according to the deviation
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* to achieve the desired led frequency
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* The calculation is: (100-averageDeviation)/100 * blinkTime
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* For code efficiency the calculation will be:
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* compensation = (100 - averageDeviation) * 64 / 100
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* NewBlinkTime = (compensation * BlinkTime) / 64
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*/
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static inline u8 iwl_blink_compensation(struct iwl_priv *priv,
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u8 time, u16 compensation)
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{
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if (!compensation) {
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IWL_ERR(priv, "undefined blink compensation: "
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"use pre-defined blinking time\n");
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return time;
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}
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return (u8)((time * compensation) >> 6);
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}
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/* Set led pattern command */
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static int iwl_led_pattern(struct iwl_priv *priv, unsigned int idx)
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{
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struct iwl_led_cmd led_cmd = {
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.id = IWL_LED_LINK,
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.interval = IWL_DEF_LED_INTRVL
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};
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BUG_ON(idx > IWL_MAX_BLINK_TBL);
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IWL_DEBUG_LED(priv, "Led blink time compensation= %u\n",
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priv->cfg->base_params->led_compensation);
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led_cmd.on =
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iwl_blink_compensation(priv, blink_tbl[idx].on_time,
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priv->cfg->base_params->led_compensation);
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led_cmd.off =
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iwl_blink_compensation(priv, blink_tbl[idx].off_time,
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priv->cfg->base_params->led_compensation);
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return priv->cfg->ops->led->cmd(priv, &led_cmd);
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}
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int iwl_led_start(struct iwl_priv *priv)
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{
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return priv->cfg->ops->led->on(priv);
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}
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EXPORT_SYMBOL(iwl_led_start);
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int iwl_led_associate(struct iwl_priv *priv)
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{
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IWL_DEBUG_LED(priv, "Associated\n");
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if (priv->cfg->led_mode == IWL_LED_BLINK)
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priv->allow_blinking = 1;
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priv->last_blink_time = jiffies;
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return 0;
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}
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EXPORT_SYMBOL(iwl_led_associate);
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int iwl_led_disassociate(struct iwl_priv *priv)
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{
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priv->allow_blinking = 0;
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return 0;
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}
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EXPORT_SYMBOL(iwl_led_disassociate);
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/*
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* calculate blink rate according to last second Tx/Rx activities
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*/
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static int iwl_get_blink_rate(struct iwl_priv *priv)
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{
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int i;
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/* count both tx and rx traffic to be able to
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* handle traffic in either direction
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*/
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u64 current_tpt = priv->tx_stats.data_bytes +
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priv->rx_stats.data_bytes;
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s64 tpt = current_tpt - priv->led_tpt;
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if (tpt < 0) /* wraparound */
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tpt = -tpt;
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IWL_DEBUG_LED(priv, "tpt %lld current_tpt %llu\n",
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(long long)tpt,
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(unsigned long long)current_tpt);
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priv->led_tpt = current_tpt;
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if (!priv->allow_blinking)
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i = IWL_MAX_BLINK_TBL;
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else
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for (i = 0; i < IWL_MAX_BLINK_TBL; i++)
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if (tpt > (blink_tbl[i].tpt * IWL_1MB_RATE))
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break;
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IWL_DEBUG_LED(priv, "LED BLINK IDX=%d\n", i);
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return i;
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}
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/*
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* this function called from handler. Since setting Led command can
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* happen very frequent we postpone led command to be called from
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* REPLY handler so we know ucode is up
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*/
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void iwl_leds_background(struct iwl_priv *priv)
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{
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u8 blink_idx;
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if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
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priv->last_blink_time = 0;
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return;
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}
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if (iwl_is_rfkill(priv)) {
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priv->last_blink_time = 0;
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return;
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}
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if (!priv->allow_blinking) {
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priv->last_blink_time = 0;
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if (priv->last_blink_rate != IWL_SOLID_BLINK_IDX) {
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priv->last_blink_rate = IWL_SOLID_BLINK_IDX;
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iwl_led_pattern(priv, IWL_SOLID_BLINK_IDX);
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}
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return;
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}
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if (!priv->last_blink_time ||
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!time_after(jiffies, priv->last_blink_time +
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msecs_to_jiffies(1000)))
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return;
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blink_idx = iwl_get_blink_rate(priv);
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/* call only if blink rate change */
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if (blink_idx != priv->last_blink_rate)
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iwl_led_pattern(priv, blink_idx);
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priv->last_blink_time = jiffies;
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priv->last_blink_rate = blink_idx;
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}
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EXPORT_SYMBOL(iwl_leds_background);
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void iwl_leds_init(struct iwl_priv *priv)
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{
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priv->last_blink_rate = 0;
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priv->last_blink_time = 0;
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priv->allow_blinking = 0;
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if (led_mode != IWL_LED_DEFAULT &&
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led_mode != priv->cfg->led_mode)
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priv->cfg->led_mode = led_mode;
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}
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EXPORT_SYMBOL(iwl_leds_init);
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