drivers/net/wireless/iwlwifi/iwl-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  * James P. Ketrenos <ipw2100-admin@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/version.h>
  31 #include <linux/init.h>
  32 #include <linux/pci.h>
  33 #include <linux/dma-mapping.h>
  34 #include <linux/delay.h>
  35 #include <linux/skbuff.h>
  36 #include <linux/netdevice.h>
  37 #include <linux/wireless.h>
  38 #include <net/mac80211.h>
  39 #include <linux/etherdevice.h>
  40 #include <asm/unaligned.h>
  41
  42 #include "iwl-4965.h"
  43 #include "iwl-core.h"
  44 #include "iwl-io.h"
  45 #include "iwl-helpers.h"
  46
  47 #define IWL_1MB_RATE (128 * 1024)
  48 #define IWL_LED_THRESHOLD (16)
  49 #define IWL_MAX_BLINK_TBL (10)
  50
  51 static const struct {
  52         u16 tpt;
  53         u8 on_time;
  54         u8 of_time;
  55 } blink_tbl[] =
  56 {
  57         {300, 25, 25},
  58         {200, 40, 40},
  59         {100, 55, 55},
  60         {70, 65, 65},
  61         {50, 75, 75},
  62         {20, 85, 85},
  63         {15, 95, 95 },
  64         {10, 110, 110},
  65         {5, 130, 130},
  66         {0, 167, 167}
  67 };
  68
  69 static int iwl_led_cmd_callback(struct iwl_priv *priv,
  70                                 struct iwl_cmd *cmd, struct sk_buff *skb)
  71 {
  72         return 1;
  73 }
  74
  75
  76 /* Send led command */
  77 static int iwl_send_led_cmd(struct iwl_priv *priv,
  78                             struct iwl4965_led_cmd *led_cmd)
  79 {
  80         struct iwl_host_cmd cmd = {
  81                 .id = REPLY_LEDS_CMD,
  82                 .len = sizeof(struct iwl4965_led_cmd),
  83                 .data = led_cmd,
  84                 .meta.flags = CMD_ASYNC,
  85                 .meta.u.callback = iwl_led_cmd_callback
  86         };
  87         u32 reg;
  88
  89         reg = iwl_read32(priv, CSR_LED_REG);
  90         if (reg != (reg & CSR_LED_BSM_CTRL_MSK))
  91                 iwl_write32(priv, CSR_LED_REG, reg & CSR_LED_BSM_CTRL_MSK);
  92
  93         return iwl_send_cmd(priv, &cmd);
  94 }
  95
  96
  97 /* Set led on command */
  98 static int iwl4965_led_on(struct iwl_priv *priv, int led_id)
  99 {
 100         struct iwl4965_led_cmd led_cmd = {
 101                 .id = led_id,
 102                 .on = IWL_LED_SOLID,
 103                 .off = 0,
 104                 .interval = IWL_DEF_LED_INTRVL
 105         };
 106         return iwl_send_led_cmd(priv, &led_cmd);
 107 }
 108
 109 /* Set led on command */
 110 static int iwl4965_led_pattern(struct iwl_priv *priv, int led_id,
 111                                enum led_brightness brightness)
 112 {
 113         struct iwl4965_led_cmd led_cmd = {
 114                 .id = led_id,
 115                 .on = brightness,
 116                 .off = brightness,
 117                 .interval = IWL_DEF_LED_INTRVL
 118         };
 119         if (brightness == LED_FULL) {
 120                 led_cmd.on = IWL_LED_SOLID;
 121                 led_cmd.off = 0;
 122         }
 123         return iwl_send_led_cmd(priv, &led_cmd);
 124 }
 125
 126 /* Set led register off */
 127 static int iwl4965_led_on_reg(struct iwl_priv *priv, int led_id)
 128 {
 129         IWL_DEBUG_LED("led on %d\n", led_id);
 130         iwl_write32(priv, CSR_LED_REG, CSR_LED_REG_TRUN_ON);
 131         return 0;
 132 }
 133
 134 #if 0
 135 /* Set led off command */
 136 int iwl4965_led_off(struct iwl_priv *priv, int led_id)
 137 {
 138         struct iwl4965_led_cmd led_cmd = {
 139                 .id = led_id,
 140                 .on = 0,
 141                 .off = 0,
 142                 .interval = IWL_DEF_LED_INTRVL
 143         };
 144         IWL_DEBUG_LED("led off %d\n", led_id);
 145         return iwl_send_led_cmd(priv, &led_cmd);
 146 }
 147 #endif
 148
 149
 150 /* Set led register off */
 151 static int iwl4965_led_off_reg(struct iwl_priv *priv, int led_id)
 152 {
 153         IWL_DEBUG_LED("radio off\n");
 154         iwl_write32(priv, CSR_LED_REG, CSR_LED_REG_TRUN_OFF);
 155         return 0;
 156 }
 157
 158 /* Set led blink command */
 159 static int iwl4965_led_not_solid(struct iwl_priv *priv, int led_id,
 160                                u8 brightness)
 161 {
 162         struct iwl4965_led_cmd led_cmd = {
 163                 .id = led_id,
 164                 .on = brightness,
 165                 .off = brightness,
 166                 .interval = IWL_DEF_LED_INTRVL
 167         };
 168
 169         return iwl_send_led_cmd(priv, &led_cmd);
 170 }
 171
 172
 173 /*
 174  * brightness call back function for Tx/Rx LED
 175  */
 176 static int iwl4965_led_associated(struct iwl_priv *priv, int led_id)
 177 {
 178         if (test_bit(STATUS_EXIT_PENDING, &priv->status) ||
 179             !test_bit(STATUS_READY, &priv->status))
 180                 return 0;
 181
 182
 183         /* start counting Tx/Rx bytes */
 184         if (!priv->last_blink_time && priv->allow_blinking)
 185                 priv->last_blink_time = jiffies;
 186         return 0;
 187 }
 188
 189 /*
 190  * brightness call back for association and radio
 191  */
 192 static void iwl4965_led_brightness_set(struct led_classdev *led_cdev,
 193                                        enum led_brightness brightness)
 194 {
 195         struct iwl4965_led *led = container_of(led_cdev,
 196                                                struct iwl4965_led, led_dev);
 197         struct iwl_priv *priv = led->priv;
 198
 199         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 200                 return;
 201
 202         switch (brightness) {
 203         case LED_FULL:
 204                 if (led->type == IWL_LED_TRG_ASSOC)
 205                         priv->allow_blinking = 1;
 206
 207                 if (led->led_on)
 208                         led->led_on(priv, IWL_LED_LINK);
 209                 break;
 210         case LED_OFF:
 211                 if (led->type == IWL_LED_TRG_ASSOC)
 212                         priv->allow_blinking = 0;
 213
 214                 if (led->led_off)
 215                         led->led_off(priv, IWL_LED_LINK);
 216                 break;
 217         default:
 218                 if (led->led_pattern)
 219                         led->led_pattern(priv, IWL_LED_LINK, brightness);
 220                 break;
 221         }
 222 }
 223
 224
 225
 226 /*
 227  * Register led class with the system
 228  */
 229 static int iwl_leds_register_led(struct iwl_priv *priv,
 230                                    struct iwl4965_led *led,
 231                                    enum led_type type, u8 set_led,
 232                                    const char *name, char *trigger)
 233 {
 234         struct device *device = wiphy_dev(priv->hw->wiphy);
 235         int ret;
 236
 237         led->led_dev.name = name;
 238         led->led_dev.brightness_set = iwl4965_led_brightness_set;
 239         led->led_dev.default_trigger = trigger;
 240
 241         led->priv = priv;
 242         led->type = type;
 243
 244         ret = led_classdev_register(device, &led->led_dev);
 245         if (ret) {
 246                 IWL_ERROR("Error: failed to register led handler.\n");
 247                 return ret;
 248         }
 249
 250         led->registered = 1;
 251
 252         if (set_led && led->led_on)
 253                 led->led_on(priv, IWL_LED_LINK);
 254
 255         return 0;
 256 }
 257
 258
 259 /*
 260  * calculate blink rate according to last 2 sec Tx/Rx activities
 261  */
 262 static inline u8 get_blink_rate(struct iwl_priv *priv)
 263 {
 264         int i;
 265         u8 blink_rate;
 266         u64 current_tpt = priv->tx_stats[2].bytes + priv->rx_stats[2].bytes;
 267         s64 tpt = current_tpt - priv->led_tpt;
 268
 269         if (tpt < 0) /* wrapparound */
 270                 tpt = -tpt;
 271
 272         priv->led_tpt = current_tpt;
 273
 274         if (tpt < IWL_LED_THRESHOLD) {
 275                 i = IWL_MAX_BLINK_TBL;
 276         } else {
 277                 for (i = 0; i < IWL_MAX_BLINK_TBL; i++)
 278                         if (tpt  > (blink_tbl[i].tpt * IWL_1MB_RATE))
 279                                 break;
 280         }
 281         /* if 0 frame is transfered */
 282         if ((i == IWL_MAX_BLINK_TBL) || !priv->allow_blinking)
 283                 blink_rate = IWL_LED_SOLID;
 284         else
 285                 blink_rate = blink_tbl[i].on_time;
 286
 287         return blink_rate;
 288 }
 289
 290 static inline int is_rf_kill(struct iwl_priv *priv)
 291 {
 292         return test_bit(STATUS_RF_KILL_HW, &priv->status) ||
 293                 test_bit(STATUS_RF_KILL_SW, &priv->status);
 294 }
 295
 296 /*
 297  * this function called from handler. Since setting Led command can
 298  * happen very frequent we postpone led command to be called from
 299  * REPLY handler so we know ucode is up
 300  */
 301 void iwl_leds_background(struct iwl_priv *priv)
 302 {
 303         u8 blink_rate;
 304
 305         if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
 306                 priv->last_blink_time = 0;
 307                 return;
 308         }
 309         if (is_rf_kill(priv)) {
 310                 priv->last_blink_time = 0;
 311                 return;
 312         }
 313
 314         if (!priv->allow_blinking) {
 315                 priv->last_blink_time = 0;
 316                 if (priv->last_blink_rate != IWL_LED_SOLID) {
 317                         priv->last_blink_rate = IWL_LED_SOLID;
 318                         iwl4965_led_on(priv, IWL_LED_LINK);
 319                 }
 320                 return;
 321         }
 322         if (!priv->last_blink_time ||
 323             !time_after(jiffies, priv->last_blink_time +
 324                         msecs_to_jiffies(1000)))
 325                 return;
 326
 327         blink_rate = get_blink_rate(priv);
 328
 329         /* call only if blink rate change */
 330         if (blink_rate != priv->last_blink_rate) {
 331                 if (blink_rate != IWL_LED_SOLID) {
 332                         priv->last_blink_time = jiffies +
 333                                                 msecs_to_jiffies(1000);
 334                         iwl4965_led_not_solid(priv, IWL_LED_LINK, blink_rate);
 335                 } else {
 336                         priv->last_blink_time = 0;
 337                         iwl4965_led_on(priv, IWL_LED_LINK);
 338                 }
 339         }
 340
 341         priv->last_blink_rate = blink_rate;
 342 }
 343 EXPORT_SYMBOL(iwl_leds_background);
 344
 345 /* Register all led handler */
 346 int iwl_leds_register(struct iwl_priv *priv)
 347 {
 348         char *trigger;
 349         char name[32];
 350         int ret;
 351
 352         priv->last_blink_rate = 0;
 353         priv->led_tpt = 0;
 354         priv->last_blink_time = 0;
 355         priv->allow_blinking = 0;
 356
 357         trigger = ieee80211_get_radio_led_name(priv->hw);
 358         snprintf(name, sizeof(name), "iwl-%s:radio",
 359                  wiphy_name(priv->hw->wiphy));
 360
 361         priv->led[IWL_LED_TRG_RADIO].led_on = iwl4965_led_on_reg;
 362         priv->led[IWL_LED_TRG_RADIO].led_off = iwl4965_led_off_reg;
 363         priv->led[IWL_LED_TRG_RADIO].led_pattern = NULL;
 364
 365         ret = iwl_leds_register_led(priv,
 366                                    &priv->led[IWL_LED_TRG_RADIO],
 367                                    IWL_LED_TRG_RADIO, 1,
 368                                    name, trigger);
 369         if (ret)
 370                 goto exit_fail;
 371
 372         trigger = ieee80211_get_assoc_led_name(priv->hw);
 373         snprintf(name, sizeof(name), "iwl-%s:assoc",
 374                  wiphy_name(priv->hw->wiphy));
 375
 376         ret = iwl_leds_register_led(priv,
 377                                    &priv->led[IWL_LED_TRG_ASSOC],
 378                                    IWL_LED_TRG_ASSOC, 0,
 379                                    name, trigger);
 380         /* for assoc always turn led on */
 381         priv->led[IWL_LED_TRG_ASSOC].led_on = iwl4965_led_on_reg;
 382         priv->led[IWL_LED_TRG_ASSOC].led_off = iwl4965_led_on_reg;
 383         priv->led[IWL_LED_TRG_ASSOC].led_pattern = NULL;
 384
 385         if (ret)
 386                 goto exit_fail;
 387
 388         trigger = ieee80211_get_rx_led_name(priv->hw);
 389         snprintf(name, sizeof(name), "iwl-%s:RX",
 390                  wiphy_name(priv->hw->wiphy));
 391
 392
 393         ret = iwl_leds_register_led(priv,
 394                                    &priv->led[IWL_LED_TRG_RX],
 395                                    IWL_LED_TRG_RX, 0,
 396                                    name, trigger);
 397
 398         priv->led[IWL_LED_TRG_RX].led_on = iwl4965_led_associated;
 399         priv->led[IWL_LED_TRG_RX].led_off = iwl4965_led_associated;
 400         priv->led[IWL_LED_TRG_RX].led_pattern = iwl4965_led_pattern;
 401
 402         if (ret)
 403                 goto exit_fail;
 404
 405         trigger = ieee80211_get_tx_led_name(priv->hw);
 406         snprintf(name, sizeof(name), "iwl-%s:TX",
 407                  wiphy_name(priv->hw->wiphy));
 408         ret = iwl_leds_register_led(priv,
 409                                    &priv->led[IWL_LED_TRG_TX],
 410                                    IWL_LED_TRG_TX, 0,
 411                                    name, trigger);
 412         priv->led[IWL_LED_TRG_TX].led_on = iwl4965_led_associated;
 413         priv->led[IWL_LED_TRG_TX].led_off = iwl4965_led_associated;
 414         priv->led[IWL_LED_TRG_TX].led_pattern = iwl4965_led_pattern;
 415
 416         if (ret)
 417                 goto exit_fail;
 418
 419         return 0;
 420
 421 exit_fail:
 422         iwl_leds_unregister(priv);
 423         return ret;
 424 }
 425 EXPORT_SYMBOL(iwl_leds_register);
 426
 427 /* unregister led class */
 428 static void iwl_leds_unregister_led(struct iwl4965_led *led, u8 set_led)
 429 {
 430         if (!led->registered)
 431                 return;
 432
 433         led_classdev_unregister(&led->led_dev);
 434
 435         if (set_led)
 436                 led->led_dev.brightness_set(&led->led_dev, LED_OFF);
 437         led->registered = 0;
 438 }
 439
 440 /* Unregister all led handlers */
 441 void iwl_leds_unregister(struct iwl_priv *priv)
 442 {
 443         iwl_leds_unregister_led(&priv->led[IWL_LED_TRG_ASSOC], 0);
 444         iwl_leds_unregister_led(&priv->led[IWL_LED_TRG_RX], 0);
 445         iwl_leds_unregister_led(&priv->led[IWL_LED_TRG_TX], 0);
 446         iwl_leds_unregister_led(&priv->led[IWL_LED_TRG_RADIO], 1);
 447 }
 448 EXPORT_SYMBOL(iwl_leds_unregister);
 449