drivers/net/wireless/iwlwifi/iwl-3945-led.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2003 - 2008 Intel Corporation. All rights reserved.
   4  *
   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.
   8  *
   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
  12  * more details.
  13  *
  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
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  * Contact Information:
  22  *  Intel Linux Wireless <ilw@linux.intel.com>
  23  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  24  *
  25  *****************************************************************************/
  26
  27
  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>
  40
  41 #include "iwl-commands.h"
  42 #include "iwl-3945-commands.h"
  43 #include "iwl-3945.h"
  44
  45
  46 static const struct {
  47         u16 brightness;
  48         u8 on_time;
  49         u8 off_time;
  50 } blink_tbl[] =
  51 {
  52         {300, 25, 25},
  53         {200, 40, 40},
  54         {100, 55, 55},
  55         {70, 65, 65},
  56         {50, 75, 75},
  57         {20, 85, 85},
  58         {15, 95, 95 },
  59         {10, 110, 110},
  60         {5, 130, 130},
  61         {0, 167, 167},
  62         /*SOLID_ON*/
  63         {-1, IWL_LED_SOLID, 0}
  64 };
  65
  66 #define IWL_1MB_RATE (128 * 1024)
  67 #define IWL_LED_THRESHOLD (16)
  68 #define IWL_MAX_BLINK_TBL (ARRAY_SIZE(blink_tbl) - 1) /*Exclude Solid on*/
  69 #define IWL_SOLID_BLINK_IDX (ARRAY_SIZE(blink_tbl) - 1)
  70
  71 static int iwl3945_led_cmd_callback(struct iwl3945_priv *priv,
  72                                     struct iwl3945_cmd *cmd,
  73                                     struct sk_buff *skb)
  74 {
  75         return 1;
  76 }
  77
  78 static inline int iwl3945_brightness_to_idx(enum led_brightness brightness)
  79 {
  80         return fls(0x000000FF & (u32)brightness);
  81 }
  82
  83 /* Send led command */
  84 static int iwl_send_led_cmd(struct iwl3945_priv *priv,
  85                             struct iwl_led_cmd *led_cmd)
  86 {
  87         struct iwl3945_host_cmd cmd = {
  88                 .id = REPLY_LEDS_CMD,
  89                 .len = sizeof(struct iwl_led_cmd),
  90                 .data = led_cmd,
  91                 .meta.flags = CMD_ASYNC,
  92                 .meta.u.callback = iwl3945_led_cmd_callback,
  93         };
  94
  95         return iwl3945_send_cmd(priv, &cmd);
  96 }
  97
  98
  99
 100 /* Set led on command */
 101 static int iwl3945_led_pattern(struct iwl3945_priv *priv, int led_id,
 102                                unsigned int idx)
 103 {
 104         struct iwl_led_cmd led_cmd = {
 105                 .id = led_id,
 106                 .interval = IWL_DEF_LED_INTRVL
 107         };
 108
 109         BUG_ON(idx > IWL_MAX_BLINK_TBL);
 110
 111         led_cmd.on = blink_tbl[idx].on_time;
 112         led_cmd.off = blink_tbl[idx].off_time;
 113
 114         return iwl_send_led_cmd(priv, &led_cmd);
 115 }
 116
 117
 118 /* Set led on command */
 119 static int iwl3945_led_on(struct iwl3945_priv *priv, int led_id)
 120 {
 121         struct iwl_led_cmd led_cmd = {
 122                 .id = led_id,
 123                 .on = IWL_LED_SOLID,
 124                 .off = 0,
 125                 .interval = IWL_DEF_LED_INTRVL
 126         };
 127         return iwl_send_led_cmd(priv, &led_cmd);
 128 }
 129
 130 /* Set led off command */
 131 static int iwl3945_led_off(struct iwl3945_priv *priv, int led_id)
 132 {
 133         struct iwl_led_cmd led_cmd = {
 134                 .id = led_id,
 135                 .on = 0,
 136                 .off = 0,
 137                 .interval = IWL_DEF_LED_INTRVL
 138         };
 139         IWL_DEBUG_LED("led off %d\n", led_id);
 140         return iwl_send_led_cmd(priv, &led_cmd);
 141 }
 142
 143 /*
 144  * brightness call back function for Tx/Rx LED
 145  */
 146 static int iwl3945_led_associated(struct iwl3945_priv *priv, int led_id)
 147 {
 148         if (test_bit(STATUS_EXIT_PENDING, &priv->status) ||
 149             !test_bit(STATUS_READY, &priv->status))
 150                 return 0;
 151
 152
 153         /* start counting Tx/Rx bytes */
 154         if (!priv->last_blink_time && priv->allow_blinking)
 155                 priv->last_blink_time = jiffies;
 156         return 0;
 157 }
 158
 159 /*
 160  * brightness call back for association and radio
 161  */
 162 static void iwl3945_led_brightness_set(struct led_classdev *led_cdev,
 163                                 enum led_brightness brightness)
 164 {
 165         struct iwl3945_led *led = container_of(led_cdev,
 166                                                struct iwl3945_led, led_dev);
 167         struct iwl3945_priv *priv = led->priv;
 168
 169         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 170                 return;
 171
 172         switch (brightness) {
 173         case LED_FULL:
 174                 if (led->type == IWL_LED_TRG_ASSOC) {
 175                         priv->allow_blinking = 1;
 176                         IWL_DEBUG_LED("MAC is  associated\n");
 177                 }
 178                 if (led->led_on)
 179                         led->led_on(priv, IWL_LED_LINK);
 180                 break;
 181         case LED_OFF:
 182                 if (led->type == IWL_LED_TRG_ASSOC) {
 183                         priv->allow_blinking = 0;
 184                         IWL_DEBUG_LED("MAC is disassociated\n");
 185                 }
 186                 if (led->led_off)
 187                         led->led_off(priv, IWL_LED_LINK);
 188                 break;
 189         default:
 190                 if (led->led_pattern) {
 191                         int idx = iwl3945_brightness_to_idx(brightness);
 192                         led->led_pattern(priv, IWL_LED_LINK, idx);
 193                 }
 194                 break;
 195         }
 196 }
 197
 198
 199
 200 /*
 201  * Register led class with the system
 202  */
 203 static int iwl3945_led_register_led(struct iwl3945_priv *priv,
 204                                    struct iwl3945_led *led,
 205                                    enum led_type type, u8 set_led,
 206                                    char *trigger)
 207 {
 208         struct device *device = wiphy_dev(priv->hw->wiphy);
 209         int ret;
 210
 211         led->led_dev.name = led->name;
 212         led->led_dev.brightness_set = iwl3945_led_brightness_set;
 213         led->led_dev.default_trigger = trigger;
 214
 215         led->priv = priv;
 216         led->type = type;
 217
 218         ret = led_classdev_register(device, &led->led_dev);
 219         if (ret) {
 220                 IWL_ERROR("Error: failed to register led handler.\n");
 221                 return ret;
 222         }
 223
 224         led->registered = 1;
 225
 226         if (set_led && led->led_on)
 227                 led->led_on(priv, IWL_LED_LINK);
 228         return 0;
 229 }
 230
 231
 232 /*
 233  * calculate blink rate according to last 2 sec Tx/Rx activities
 234  */
 235 static inline u8 get_blink_rate(struct iwl3945_priv *priv)
 236 {
 237         int index;
 238         u64 current_tpt = priv->rxtxpackets;
 239         s64 tpt = current_tpt - priv->led_tpt;
 240
 241         if (tpt < 0)
 242                 tpt = -tpt;
 243         priv->led_tpt = current_tpt;
 244
 245         if (!priv->allow_blinking)
 246                 index = IWL_MAX_BLINK_TBL;
 247         else
 248                 for (index = 0; index < IWL_MAX_BLINK_TBL; index++)
 249                         if (tpt > (blink_tbl[index].brightness * IWL_1MB_RATE))
 250                                 break;
 251         return index;
 252 }
 253
 254 static inline int is_rf_kill(struct iwl3945_priv *priv)
 255 {
 256         return test_bit(STATUS_RF_KILL_HW, &priv->status) ||
 257                 test_bit(STATUS_RF_KILL_SW, &priv->status);
 258 }
 259
 260 /*
 261  * this function called from handler. Since setting Led command can
 262  * happen very frequent we postpone led command to be called from
 263  * REPLY handler so we know ucode is up
 264  */
 265 void iwl3945_led_background(struct iwl3945_priv *priv)
 266 {
 267         u8 blink_idx;
 268
 269         if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
 270                 priv->last_blink_time = 0;
 271                 return;
 272         }
 273         if (is_rf_kill(priv)) {
 274                 priv->last_blink_time = 0;
 275                 return;
 276         }
 277
 278         if (!priv->allow_blinking) {
 279                 priv->last_blink_time = 0;
 280                 if (priv->last_blink_rate != IWL_SOLID_BLINK_IDX) {
 281                         priv->last_blink_rate = IWL_SOLID_BLINK_IDX;
 282                         iwl3945_led_pattern(priv, IWL_LED_LINK,
 283                                             IWL_SOLID_BLINK_IDX);
 284                 }
 285                 return;
 286         }
 287         if (!priv->last_blink_time ||
 288             !time_after(jiffies, priv->last_blink_time +
 289                         msecs_to_jiffies(1000)))
 290                 return;
 291
 292         blink_idx = get_blink_rate(priv);
 293
 294         /* call only if blink rate change */
 295         if (blink_idx != priv->last_blink_rate)
 296                 iwl3945_led_pattern(priv, IWL_LED_LINK, blink_idx);
 297
 298         priv->last_blink_time = jiffies;
 299         priv->last_blink_rate = blink_idx;
 300         priv->rxtxpackets = 0;
 301 }
 302
 303
 304 /* Register all led handler */
 305 int iwl3945_led_register(struct iwl3945_priv *priv)
 306 {
 307         char *trigger;
 308         int ret;
 309
 310         priv->last_blink_rate = 0;
 311         priv->rxtxpackets = 0;
 312         priv->led_tpt = 0;
 313         priv->last_blink_time = 0;
 314         priv->allow_blinking = 0;
 315
 316         trigger = ieee80211_get_radio_led_name(priv->hw);
 317         snprintf(priv->led[IWL_LED_TRG_RADIO].name,
 318                  sizeof(priv->led[IWL_LED_TRG_RADIO].name), "iwl-%s:radio",
 319                  wiphy_name(priv->hw->wiphy));
 320
 321         priv->led[IWL_LED_TRG_RADIO].led_on = iwl3945_led_on;
 322         priv->led[IWL_LED_TRG_RADIO].led_off = iwl3945_led_off;
 323         priv->led[IWL_LED_TRG_RADIO].led_pattern = NULL;
 324
 325         ret = iwl3945_led_register_led(priv,
 326                                    &priv->led[IWL_LED_TRG_RADIO],
 327                                    IWL_LED_TRG_RADIO, 1, trigger);
 328
 329         if (ret)
 330                 goto exit_fail;
 331
 332         trigger = ieee80211_get_assoc_led_name(priv->hw);
 333         snprintf(priv->led[IWL_LED_TRG_ASSOC].name,
 334                  sizeof(priv->led[IWL_LED_TRG_ASSOC].name), "iwl-%s:assoc",
 335                  wiphy_name(priv->hw->wiphy));
 336
 337         ret = iwl3945_led_register_led(priv,
 338                                    &priv->led[IWL_LED_TRG_ASSOC],
 339                                    IWL_LED_TRG_ASSOC, 0, trigger);
 340
 341         /* for assoc always turn led on */
 342         priv->led[IWL_LED_TRG_ASSOC].led_on = iwl3945_led_on;
 343         priv->led[IWL_LED_TRG_ASSOC].led_off = iwl3945_led_on;
 344         priv->led[IWL_LED_TRG_ASSOC].led_pattern = NULL;
 345
 346         if (ret)
 347                 goto exit_fail;
 348
 349         trigger = ieee80211_get_rx_led_name(priv->hw);
 350         snprintf(priv->led[IWL_LED_TRG_RX].name,
 351                  sizeof(priv->led[IWL_LED_TRG_RX].name), "iwl-%s:RX",
 352                  wiphy_name(priv->hw->wiphy));
 353
 354         ret = iwl3945_led_register_led(priv,
 355                                    &priv->led[IWL_LED_TRG_RX],
 356                                    IWL_LED_TRG_RX, 0, trigger);
 357
 358         priv->led[IWL_LED_TRG_RX].led_on = iwl3945_led_associated;
 359         priv->led[IWL_LED_TRG_RX].led_off = iwl3945_led_associated;
 360         priv->led[IWL_LED_TRG_RX].led_pattern = iwl3945_led_pattern;
 361
 362         if (ret)
 363                 goto exit_fail;
 364
 365         trigger = ieee80211_get_tx_led_name(priv->hw);
 366         snprintf(priv->led[IWL_LED_TRG_TX].name,
 367                  sizeof(priv->led[IWL_LED_TRG_TX].name), "iwl-%s:TX",
 368                  wiphy_name(priv->hw->wiphy));
 369
 370         ret = iwl3945_led_register_led(priv,
 371                                    &priv->led[IWL_LED_TRG_TX],
 372                                    IWL_LED_TRG_TX, 0, trigger);
 373
 374         priv->led[IWL_LED_TRG_TX].led_on = iwl3945_led_associated;
 375         priv->led[IWL_LED_TRG_TX].led_off = iwl3945_led_associated;
 376         priv->led[IWL_LED_TRG_TX].led_pattern = iwl3945_led_pattern;
 377
 378         if (ret)
 379                 goto exit_fail;
 380
 381         return 0;
 382
 383 exit_fail:
 384         iwl3945_led_unregister(priv);
 385         return ret;
 386 }
 387
 388
 389 /* unregister led class */
 390 static void iwl3945_led_unregister_led(struct iwl3945_led *led, u8 set_led)
 391 {
 392         if (!led->registered)
 393                 return;
 394
 395         led_classdev_unregister(&led->led_dev);
 396
 397         if (set_led)
 398                 led->led_dev.brightness_set(&led->led_dev, LED_OFF);
 399         led->registered = 0;
 400 }
 401
 402 /* Unregister all led handlers */
 403 void iwl3945_led_unregister(struct iwl3945_priv *priv)
 404 {
 405         iwl3945_led_unregister_led(&priv->led[IWL_LED_TRG_ASSOC], 0);
 406         iwl3945_led_unregister_led(&priv->led[IWL_LED_TRG_RX], 0);
 407         iwl3945_led_unregister_led(&priv->led[IWL_LED_TRG_TX], 0);
 408         iwl3945_led_unregister_led(&priv->led[IWL_LED_TRG_RADIO], 1);
 409 }
 410