1 /******************************************************************************
3 * Copyright(c) 2003 - 2010 Intel Corporation. All rights reserved.
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of version 2 of the GNU General Public License as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
18 * The full GNU General Public License is included in this distribution in the
19 * file called LICENSE.
21 * Contact Information:
23 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
25 *****************************************************************************/
28 #include <linux/kernel.h>
29 #include <linux/module.h>
30 #include <linux/init.h>
31 #include <linux/pci.h>
32 #include <linux/dma-mapping.h>
33 #include <linux/delay.h>
34 #include <linux/skbuff.h>
35 #include <linux/netdevice.h>
36 #include <linux/wireless.h>
37 #include <net/mac80211.h>
38 #include <linux/etherdevice.h>
39 #include <asm/unaligned.h>
45 /* default: IWL_LED_BLINK(0) using blinking index table */
47 module_param(led_mode, int, S_IRUGO);
48 MODULE_PARM_DESC(led_mode, "0=system default, "
49 "1=On(RF On)/Off(RF Off), 2=blinking");
68 {-1, IWL_LED_SOLID, 0}
71 #define IWL_1MB_RATE (128 * 1024)
72 #define IWL_LED_THRESHOLD (16)
73 #define IWL_MAX_BLINK_TBL (ARRAY_SIZE(blink_tbl) - 1) /* exclude SOLID_ON */
74 #define IWL_SOLID_BLINK_IDX (ARRAY_SIZE(blink_tbl) - 1)
77 * Adjust led blink rate to compensate on a MAC Clock difference on every HW
78 * Led blink rate analysis showed an average deviation of 0% on 3945,
79 * 5% on 4965 HW and 20% on 5000 series and up.
80 * Need to compensate on the led on/off time per HW according to the deviation
81 * to achieve the desired led frequency
82 * The calculation is: (100-averageDeviation)/100 * blinkTime
83 * For code efficiency the calculation will be:
84 * compensation = (100 - averageDeviation) * 64 / 100
85 * NewBlinkTime = (compensation * BlinkTime) / 64
87 static inline u8 iwl_blink_compensation(struct iwl_priv *priv,
88 u8 time, u16 compensation)
91 IWL_ERR(priv, "undefined blink compensation: "
92 "use pre-defined blinking time\n");
96 return (u8)((time * compensation) >> 6);
99 /* Set led pattern command */
100 static int iwl_led_pattern(struct iwl_priv *priv, unsigned int idx)
102 struct iwl_led_cmd led_cmd = {
104 .interval = IWL_DEF_LED_INTRVL
107 BUG_ON(idx > IWL_MAX_BLINK_TBL);
109 IWL_DEBUG_LED(priv, "Led blink time compensation= %u\n",
110 priv->cfg->base_params->led_compensation);
112 iwl_blink_compensation(priv, blink_tbl[idx].on_time,
113 priv->cfg->base_params->led_compensation);
115 iwl_blink_compensation(priv, blink_tbl[idx].off_time,
116 priv->cfg->base_params->led_compensation);
118 return priv->cfg->ops->led->cmd(priv, &led_cmd);
121 int iwl_led_start(struct iwl_priv *priv)
123 return priv->cfg->ops->led->on(priv);
125 EXPORT_SYMBOL(iwl_led_start);
127 int iwl_led_associate(struct iwl_priv *priv)
129 IWL_DEBUG_LED(priv, "Associated\n");
130 if (priv->cfg->led_mode == IWL_LED_BLINK)
131 priv->allow_blinking = 1;
132 priv->last_blink_time = jiffies;
136 EXPORT_SYMBOL(iwl_led_associate);
138 int iwl_led_disassociate(struct iwl_priv *priv)
140 priv->allow_blinking = 0;
144 EXPORT_SYMBOL(iwl_led_disassociate);
147 * calculate blink rate according to last second Tx/Rx activities
149 static int iwl_get_blink_rate(struct iwl_priv *priv)
152 /* count both tx and rx traffic to be able to
153 * handle traffic in either direction
155 u64 current_tpt = priv->tx_stats.data_bytes +
156 priv->rx_stats.data_bytes;
157 s64 tpt = current_tpt - priv->led_tpt;
159 if (tpt < 0) /* wraparound */
162 IWL_DEBUG_LED(priv, "tpt %lld current_tpt %llu\n",
164 (unsigned long long)current_tpt);
165 priv->led_tpt = current_tpt;
167 if (!priv->allow_blinking)
168 i = IWL_MAX_BLINK_TBL;
170 for (i = 0; i < IWL_MAX_BLINK_TBL; i++)
171 if (tpt > (blink_tbl[i].tpt * IWL_1MB_RATE))
174 IWL_DEBUG_LED(priv, "LED BLINK IDX=%d\n", i);
179 * this function called from handler. Since setting Led command can
180 * happen very frequent we postpone led command to be called from
181 * REPLY handler so we know ucode is up
183 void iwl_leds_background(struct iwl_priv *priv)
187 if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
188 priv->last_blink_time = 0;
191 if (iwl_is_rfkill(priv)) {
192 priv->last_blink_time = 0;
196 if (!priv->allow_blinking) {
197 priv->last_blink_time = 0;
198 if (priv->last_blink_rate != IWL_SOLID_BLINK_IDX) {
199 priv->last_blink_rate = IWL_SOLID_BLINK_IDX;
200 iwl_led_pattern(priv, IWL_SOLID_BLINK_IDX);
204 if (!priv->last_blink_time ||
205 !time_after(jiffies, priv->last_blink_time +
206 msecs_to_jiffies(1000)))
209 blink_idx = iwl_get_blink_rate(priv);
211 /* call only if blink rate change */
212 if (blink_idx != priv->last_blink_rate)
213 iwl_led_pattern(priv, blink_idx);
215 priv->last_blink_time = jiffies;
216 priv->last_blink_rate = blink_idx;
218 EXPORT_SYMBOL(iwl_leds_background);
220 void iwl_leds_init(struct iwl_priv *priv)
222 priv->last_blink_rate = 0;
223 priv->last_blink_time = 0;
224 priv->allow_blinking = 0;
225 if (led_mode != IWL_LED_DEFAULT &&
226 led_mode != priv->cfg->led_mode)
227 priv->cfg->led_mode = led_mode;
229 EXPORT_SYMBOL(iwl_leds_init);