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  * 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-3945.h"
  43 #include "iwl-helpers.h"
  44
  45 #define IWL_1MB_RATE (128 * 1024)
  46 #define IWL_LED_THRESHOLD (16)
  47 #define IWL_MAX_BLINK_TBL (10)
  48
  49 static const struct {
  50         u16 brightness;
  51         u8 on_time;
  52         u8 of_time;
  53 } blink_tbl[] =
  54 {
  55         {300, 25, 25},
  56         {200, 40, 40},
  57         {100, 55, 55},
  58         {70, 65, 65},
  59         {50, 75, 75},
  60         {20, 85, 85},
  61         {15, 95, 95 },
  62         {10, 110, 110},
  63         {5, 130, 130},
  64         {0, 167, 167}
  65 };
  66
  67 static int iwl3945_led_cmd_callback(struct iwl3945_priv *priv,
  68                                     struct iwl3945_cmd *cmd,
  69                                     struct sk_buff *skb)
  70 {
  71         return 1;
  72 }
  73
  74
  75 /* Send led command */
  76 static int iwl_send_led_cmd(struct iwl3945_priv *priv,
  77                             struct iwl3945_led_cmd *led_cmd)
  78 {
  79         struct iwl3945_host_cmd cmd = {
  80                 .id = REPLY_LEDS_CMD,
  81                 .len = sizeof(struct iwl3945_led_cmd),
  82                 .data = led_cmd,
  83                 .meta.flags = CMD_ASYNC,
  84                 .meta.u.callback = iwl3945_led_cmd_callback
  85         };
  86
  87         return iwl3945_send_cmd(priv, &cmd);
  88 }
  89
  90
  91 /* Set led on command */
  92 static int iwl3945_led_on(struct iwl3945_priv *priv, int led_id)
  93 {
  94         struct iwl3945_led_cmd led_cmd = {
  95                 .id = led_id,
  96                 .on = IWL_LED_SOLID,
  97                 .off = 0,
  98                 .interval = IWL_DEF_LED_INTRVL
  99         };
 100         return iwl_send_led_cmd(priv, &led_cmd);
 101 }
 102
 103 /* Set led on command */
 104 static int iwl3945_led_pattern(struct iwl3945_priv *priv, int led_id,
 105                                enum led_brightness brightness)
 106 {
 107         struct iwl3945_led_cmd led_cmd = {
 108                 .id = led_id,
 109                 .on = brightness,
 110                 .off = brightness,
 111                 .interval = IWL_DEF_LED_INTRVL
 112         };
 113         if (brightness == LED_FULL) {
 114                 led_cmd.on = IWL_LED_SOLID;
 115                 led_cmd.off = 0;
 116         }
 117         return iwl_send_led_cmd(priv, &led_cmd);
 118 }
 119
 120 /* Set led register off */
 121 static int iwl3945_led_on_reg(struct iwl3945_priv *priv, int led_id)
 122 {
 123         IWL_DEBUG_LED("led on %d\n", led_id);
 124         return iwl3945_led_on(priv, led_id);
 125 }
 126
 127 /* Set led off command */
 128 static int iwl3945_led_off(struct iwl3945_priv *priv, int led_id)
 129 {
 130         struct iwl3945_led_cmd led_cmd = {
 131                 .id = led_id,
 132                 .on = 0,
 133                 .off = 0,
 134                 .interval = IWL_DEF_LED_INTRVL
 135         };
 136         IWL_DEBUG_LED("led off %d\n", led_id);
 137         return iwl_send_led_cmd(priv, &led_cmd);
 138 }
 139
 140 /* Set led register off */
 141 static int iwl3945_led_off_reg(struct iwl3945_priv *priv, int led_id)
 142 {
 143         iwl3945_led_off(priv, led_id);
 144         return 0;
 145 }
 146
 147 /* Set led blink command */
 148 static int iwl3945_led_not_solid(struct iwl3945_priv *priv, int led_id,
 149                                u8 brightness)
 150 {
 151         struct iwl3945_led_cmd led_cmd = {
 152                 .id = led_id,
 153                 .on = brightness,
 154                 .off = brightness,
 155                 .interval = IWL_DEF_LED_INTRVL
 156         };
 157
 158         return iwl_send_led_cmd(priv, &led_cmd);
 159 }
 160
 161
 162 /*
 163  * brightness call back function for Tx/Rx LED
 164  */
 165 static int iwl3945_led_associated(struct iwl3945_priv *priv, int led_id)
 166 {
 167         if (test_bit(STATUS_EXIT_PENDING, &priv->status) ||
 168             !test_bit(STATUS_READY, &priv->status))
 169                 return 0;
 170
 171
 172         /* start counting Tx/Rx bytes */
 173         if (!priv->last_blink_time && priv->allow_blinking)
 174                 priv->last_blink_time = jiffies;
 175         return 0;
 176 }
 177
 178 /*
 179  * brightness call back for association and radio
 180  */
 181 static void iwl3945_led_brightness_set(struct led_classdev *led_cdev,
 182                                 enum led_brightness brightness)
 183 {
 184         struct iwl3945_led *led = container_of(led_cdev,
 185                                                struct iwl3945_led, led_dev);
 186         struct iwl3945_priv *priv = led->priv;
 187
 188         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 189                 return;
 190
 191         switch (brightness) {
 192         case LED_FULL:
 193                 if (led->type == IWL_LED_TRG_ASSOC) {
 194                         priv->allow_blinking = 1;
 195                         IWL_DEBUG_LED("MAC is  associated\n");
 196                 }
 197                 if (led->led_on)
 198                         led->led_on(priv, IWL_LED_LINK);
 199                 break;
 200         case LED_OFF:
 201                 if (led->type == IWL_LED_TRG_ASSOC) {
 202                         priv->allow_blinking = 0;
 203                         IWL_DEBUG_LED("MAC is disassociated\n");
 204                 }
 205                 if (led->led_off)
 206                         led->led_off(priv, IWL_LED_LINK);
 207                 break;
 208         default:
 209                 if (led->led_pattern)
 210                         led->led_pattern(priv, IWL_LED_LINK, brightness);
 211                 break;
 212         }
 213 }
 214
 215
 216
 217 /*
 218  * Register led class with the system
 219  */
 220 static int iwl3945_led_register_led(struct iwl3945_priv *priv,
 221                                    struct iwl3945_led *led,
 222                                    enum led_type type, u8 set_led,
 223                                    const char *name, char *trigger)
 224 {
 225         struct device *device = wiphy_dev(priv->hw->wiphy);
 226         int ret;
 227
 228         led->led_dev.name = name;
 229         led->led_dev.brightness_set = iwl3945_led_brightness_set;
 230         led->led_dev.default_trigger = trigger;
 231
 232         led->priv = priv;
 233         led->type = type;
 234
 235         ret = led_classdev_register(device, &led->led_dev);
 236         if (ret) {
 237                 IWL_ERROR("Error: failed to register led handler.\n");
 238                 return ret;
 239         }
 240
 241         led->registered = 1;
 242
 243         if (set_led && led->led_on)
 244                 led->led_on(priv, IWL_LED_LINK);
 245         return 0;
 246 }
 247
 248
 249 /*
 250  * calculate blink rate according to last 2 sec Tx/Rx activities
 251  */
 252 static inline u8 get_blink_rate(struct iwl3945_priv *priv)
 253 {
 254         int index;
 255         u8 blink_rate;
 256
 257         if (priv->rxtxpackets < IWL_LED_THRESHOLD)
 258                 index = 10;
 259         else {
 260                 for (index = 0; index < IWL_MAX_BLINK_TBL; index++) {
 261                         if (priv->rxtxpackets > (blink_tbl[index].brightness *
 262                                                  IWL_1MB_RATE))
 263                                 break;
 264                 }
 265         }
 266         /* if 0 frame is transfered */
 267         if ((index == IWL_MAX_BLINK_TBL) || !priv->allow_blinking)
 268                 blink_rate = IWL_LED_SOLID;
 269         else
 270                 blink_rate = blink_tbl[index].on_time;
 271
 272         return blink_rate;
 273 }
 274
 275 static inline int is_rf_kill(struct iwl3945_priv *priv)
 276 {
 277         return test_bit(STATUS_RF_KILL_HW, &priv->status) ||
 278                 test_bit(STATUS_RF_KILL_SW, &priv->status);
 279 }
 280
 281 /*
 282  * this function called from handler. Since setting Led command can
 283  * happen very frequent we postpone led command to be called from
 284  * REPLY handler so we know ucode is up
 285  */
 286 void iwl3945_led_background(struct iwl3945_priv *priv)
 287 {
 288         u8 blink_rate;
 289
 290         if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
 291                 priv->last_blink_time = 0;
 292                 return;
 293         }
 294         if (is_rf_kill(priv)) {
 295                 priv->last_blink_time = 0;
 296                 return;
 297         }
 298
 299         if (!priv->allow_blinking) {
 300                 priv->last_blink_time = 0;
 301                 if (priv->last_blink_rate != IWL_LED_SOLID) {
 302                         priv->last_blink_rate = IWL_LED_SOLID;
 303                         iwl3945_led_on(priv, IWL_LED_LINK);
 304                 }
 305                 return;
 306         }
 307         if (!priv->last_blink_time ||
 308             !time_after(jiffies, priv->last_blink_time +
 309                         msecs_to_jiffies(1000)))
 310                 return;
 311
 312         blink_rate = get_blink_rate(priv);
 313
 314         /* call only if blink rate change */
 315         if (blink_rate != priv->last_blink_rate) {
 316                 if (blink_rate != IWL_LED_SOLID) {
 317                         priv->last_blink_time = jiffies +
 318                                                 msecs_to_jiffies(1000);
 319                         iwl3945_led_not_solid(priv, IWL_LED_LINK, blink_rate);
 320                 } else {
 321                         priv->last_blink_time = 0;
 322                         iwl3945_led_on(priv, IWL_LED_LINK);
 323                 }
 324         }
 325
 326         priv->last_blink_rate = blink_rate;
 327         priv->rxtxpackets = 0;
 328 }
 329
 330
 331 /* Register all led handler */
 332 int iwl3945_led_register(struct iwl3945_priv *priv)
 333 {
 334         char *trigger;
 335         char name[32];
 336         int ret;
 337
 338         priv->last_blink_rate = 0;
 339         priv->rxtxpackets = 0;
 340         priv->last_blink_time = 0;
 341         priv->allow_blinking = 0;
 342
 343         trigger = ieee80211_get_radio_led_name(priv->hw);
 344         snprintf(name, sizeof(name), "iwl-%s:radio",
 345                  wiphy_name(priv->hw->wiphy));
 346
 347         priv->led[IWL_LED_TRG_RADIO].led_on = iwl3945_led_on_reg;
 348         priv->led[IWL_LED_TRG_RADIO].led_off = iwl3945_led_off_reg;
 349         priv->led[IWL_LED_TRG_RADIO].led_pattern = NULL;
 350
 351         ret = iwl3945_led_register_led(priv,
 352                                    &priv->led[IWL_LED_TRG_RADIO],
 353                                    IWL_LED_TRG_RADIO, 1,
 354                                    name, trigger);
 355         if (ret)
 356                 goto exit_fail;
 357
 358         trigger = ieee80211_get_assoc_led_name(priv->hw);
 359         snprintf(name, sizeof(name), "iwl-%s:assoc",
 360                  wiphy_name(priv->hw->wiphy));
 361
 362         ret = iwl3945_led_register_led(priv,
 363                                    &priv->led[IWL_LED_TRG_ASSOC],
 364                                    IWL_LED_TRG_ASSOC, 0,
 365                                    name, trigger);
 366         /* for assoc always turn led on */
 367         priv->led[IWL_LED_TRG_ASSOC].led_on = iwl3945_led_on_reg;
 368         priv->led[IWL_LED_TRG_ASSOC].led_off = iwl3945_led_on_reg;
 369         priv->led[IWL_LED_TRG_ASSOC].led_pattern = NULL;
 370
 371         if (ret)
 372                 goto exit_fail;
 373
 374         trigger = ieee80211_get_rx_led_name(priv->hw);
 375         snprintf(name, sizeof(name), "iwl-%s:RX",
 376                  wiphy_name(priv->hw->wiphy));
 377
 378
 379         ret = iwl3945_led_register_led(priv,
 380                                    &priv->led[IWL_LED_TRG_RX],
 381                                    IWL_LED_TRG_RX, 0,
 382                                    name, trigger);
 383
 384         priv->led[IWL_LED_TRG_RX].led_on = iwl3945_led_associated;
 385         priv->led[IWL_LED_TRG_RX].led_off = iwl3945_led_associated;
 386         priv->led[IWL_LED_TRG_RX].led_pattern = iwl3945_led_pattern;
 387
 388         if (ret)
 389                 goto exit_fail;
 390
 391         trigger = ieee80211_get_tx_led_name(priv->hw);
 392         snprintf(name, sizeof(name), "iwl-%s:TX",
 393                  wiphy_name(priv->hw->wiphy));
 394         ret = iwl3945_led_register_led(priv,
 395                                    &priv->led[IWL_LED_TRG_TX],
 396                                    IWL_LED_TRG_TX, 0,
 397                                    name, trigger);
 398         priv->led[IWL_LED_TRG_TX].led_on = iwl3945_led_associated;
 399         priv->led[IWL_LED_TRG_TX].led_off = iwl3945_led_associated;
 400         priv->led[IWL_LED_TRG_TX].led_pattern = iwl3945_led_pattern;
 401
 402         if (ret)
 403                 goto exit_fail;
 404
 405         return 0;
 406
 407 exit_fail:
 408         iwl3945_led_unregister(priv);
 409         return ret;
 410 }
 411
 412
 413 /* unregister led class */
 414 static void iwl3945_led_unregister_led(struct iwl3945_led *led, u8 set_led)
 415 {
 416         if (!led->registered)
 417                 return;
 418
 419         led_classdev_unregister(&led->led_dev);
 420
 421         if (set_led)
 422                 led->led_dev.brightness_set(&led->led_dev, LED_OFF);
 423         led->registered = 0;
 424 }
 425
 426 /* Unregister all led handlers */
 427 void iwl3945_led_unregister(struct iwl3945_priv *priv)
 428 {
 429         iwl3945_led_unregister_led(&priv->led[IWL_LED_TRG_ASSOC], 0);
 430         iwl3945_led_unregister_led(&priv->led[IWL_LED_TRG_RX], 0);
 431         iwl3945_led_unregister_led(&priv->led[IWL_LED_TRG_TX], 0);
 432         iwl3945_led_unregister_led(&priv->led[IWL_LED_TRG_RADIO], 1);
 433 }
 434