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-helpers.h"
  45
  46 #define IWL_1MB_RATE (128 * 1024)
  47 #define IWL_LED_THRESHOLD (16)
  48 #define IWL_MAX_BLINK_TBL (10)
  49
  50 static const struct {
  51         u16 tpt;
  52         u8 on_time;
  53         u8 of_time;
  54 } blink_tbl[] =
  55 {
  56         {300, 25, 25},
  57         {200, 40, 40},
  58         {100, 55, 55},
  59         {70, 65, 65},
  60         {50, 75, 75},
  61         {20, 85, 85},
  62         {15, 95, 95 },
  63         {10, 110, 110},
  64         {5, 130, 130},
  65         {0, 167, 167}
  66 };
  67
  68 static int iwl_led_cmd_callback(struct iwl_priv *priv,
  69                                 struct iwl_cmd *cmd, struct sk_buff *skb)
  70 {
  71         return 1;
  72 }
  73
  74
  75 /* Send led command */
  76 static int iwl_send_led_cmd(struct iwl_priv *priv,
  77                             struct iwl4965_led_cmd *led_cmd)
  78 {
  79         struct iwl_host_cmd cmd = {
  80                 .id = REPLY_LEDS_CMD,
  81                 .len = sizeof(struct iwl4965_led_cmd),
  82                 .data = led_cmd,
  83                 .meta.flags = CMD_ASYNC,
  84                 .meta.u.callback = iwl_led_cmd_callback
  85         };
  86         u32 reg;
  87
  88         reg = iwl4965_read32(priv, CSR_LED_REG);
  89         if (reg != (reg & CSR_LED_BSM_CTRL_MSK))
  90                 iwl4965_write32(priv, CSR_LED_REG, reg & CSR_LED_BSM_CTRL_MSK);
  91
  92         return iwl_send_cmd(priv, &cmd);
  93 }
  94
  95
  96 /* Set led on command */
  97 static int iwl4965_led_on(struct iwl_priv *priv, int led_id)
  98 {
  99         struct iwl4965_led_cmd led_cmd = {
 100                 .id = led_id,
 101                 .on = IWL_LED_SOLID,
 102                 .off = 0,
 103                 .interval = IWL_DEF_LED_INTRVL
 104         };
 105         return iwl_send_led_cmd(priv, &led_cmd);
 106 }
 107
 108 /* Set led on command */
 109 static int iwl4965_led_pattern(struct iwl_priv *priv, int led_id,
 110                                enum led_brightness brightness)
 111 {
 112         struct iwl4965_led_cmd led_cmd = {
 113                 .id = led_id,
 114                 .on = brightness,
 115                 .off = brightness,
 116                 .interval = IWL_DEF_LED_INTRVL
 117         };
 118         if (brightness == LED_FULL) {
 119                 led_cmd.on = IWL_LED_SOLID;
 120                 led_cmd.off = 0;
 121         }
 122         return iwl_send_led_cmd(priv, &led_cmd);
 123 }
 124
 125 /* Set led register off */
 126 static int iwl4965_led_on_reg(struct iwl_priv *priv, int led_id)
 127 {
 128         IWL_DEBUG_LED("led on %d\n", led_id);
 129         iwl4965_write32(priv, CSR_LED_REG, CSR_LED_REG_TRUN_ON);
 130         return 0;
 131 }
 132
 133 #if 0
 134 /* Set led off command */
 135 int iwl4965_led_off(struct iwl_priv *priv, int led_id)
 136 {
 137         struct iwl4965_led_cmd led_cmd = {
 138                 .id = led_id,
 139                 .on = 0,
 140                 .off = 0,
 141                 .interval = IWL_DEF_LED_INTRVL
 142         };
 143         IWL_DEBUG_LED("led off %d\n", led_id);
 144         return iwl_send_led_cmd(priv, &led_cmd);
 145 }
 146 #endif
 147
 148
 149 /* Set led register off */
 150 static int iwl4965_led_off_reg(struct iwl_priv *priv, int led_id)
 151 {
 152         IWL_DEBUG_LED("radio off\n");
 153         iwl4965_write32(priv, CSR_LED_REG, CSR_LED_REG_TRUN_OFF);
 154         return 0;
 155 }
 156
 157 /* Set led blink command */
 158 static int iwl4965_led_not_solid(struct iwl_priv *priv, int led_id,
 159                                u8 brightness)
 160 {
 161         struct iwl4965_led_cmd led_cmd = {
 162                 .id = led_id,
 163                 .on = brightness,
 164                 .off = brightness,
 165                 .interval = IWL_DEF_LED_INTRVL
 166         };
 167
 168         return iwl_send_led_cmd(priv, &led_cmd);
 169 }
 170
 171
 172 /*
 173  * brightness call back function for Tx/Rx LED
 174  */
 175 static int iwl4965_led_associated(struct iwl_priv *priv, int led_id)
 176 {
 177         if (test_bit(STATUS_EXIT_PENDING, &priv->status) ||
 178             !test_bit(STATUS_READY, &priv->status))
 179                 return 0;
 180
 181
 182         /* start counting Tx/Rx bytes */
 183         if (!priv->last_blink_time && priv->allow_blinking)
 184                 priv->last_blink_time = jiffies;
 185         return 0;
 186 }
 187
 188 /*
 189  * brightness call back for association and radio
 190  */
 191 static void iwl4965_led_brightness_set(struct led_classdev *led_cdev,
 192                                        enum led_brightness brightness)
 193 {
 194         struct iwl4965_led *led = container_of(led_cdev,
 195                                                struct iwl4965_led, led_dev);
 196         struct iwl_priv *priv = led->priv;
 197
 198         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 199                 return;
 200
 201         switch (brightness) {
 202         case LED_FULL:
 203                 if (led->type == IWL_LED_TRG_ASSOC)
 204                         priv->allow_blinking = 1;
 205
 206                 if (led->led_on)
 207                         led->led_on(priv, IWL_LED_LINK);
 208                 break;
 209         case LED_OFF:
 210                 if (led->type == IWL_LED_TRG_ASSOC)
 211                         priv->allow_blinking = 0;
 212
 213                 if (led->led_off)
 214                         led->led_off(priv, IWL_LED_LINK);
 215                 break;
 216         default:
 217                 if (led->led_pattern)
 218                         led->led_pattern(priv, IWL_LED_LINK, brightness);
 219                 break;
 220         }
 221 }
 222
 223
 224
 225 /*
 226  * Register led class with the system
 227  */
 228 static int iwl_leds_register_led(struct iwl_priv *priv,
 229                                    struct iwl4965_led *led,
 230                                    enum led_type type, u8 set_led,
 231                                    const char *name, char *trigger)
 232 {
 233         struct device *device = wiphy_dev(priv->hw->wiphy);
 234         int ret;
 235
 236         led->led_dev.name = name;
 237         led->led_dev.brightness_set = iwl4965_led_brightness_set;
 238         led->led_dev.default_trigger = trigger;
 239
 240         ret = led_classdev_register(device, &led->led_dev);
 241         if (ret) {
 242                 IWL_ERROR("Error: failed to register led handler.\n");
 243                 return ret;
 244         }
 245
 246         led->priv = priv;
 247         led->type = type;
 248         led->registered = 1;
 249
 250         if (set_led && led->led_on)
 251                 led->led_on(priv, IWL_LED_LINK);
 252         return 0;
 253 }
 254
 255
 256 /*
 257  * calculate blink rate according to last 2 sec Tx/Rx activities
 258  */
 259 static inline u8 get_blink_rate(struct iwl_priv *priv)
 260 {
 261         int i;
 262         u8 blink_rate;
 263         u64 current_tpt = priv->tx_stats[2].bytes + priv->rx_stats[2].bytes;
 264         s64 tpt = current_tpt - priv->led_tpt;
 265
 266         if (tpt < 0) /* wrapparound */
 267                 tpt = -tpt;
 268
 269         priv->led_tpt = current_tpt;
 270
 271         if (tpt < IWL_LED_THRESHOLD) {
 272                 i = IWL_MAX_BLINK_TBL;
 273         } else {
 274                 for (i = 0; i < IWL_MAX_BLINK_TBL; i++)
 275                         if (tpt  > (blink_tbl[i].tpt * IWL_1MB_RATE))
 276                                 break;
 277         }
 278         /* if 0 frame is transfered */
 279         if ((i == IWL_MAX_BLINK_TBL) || !priv->allow_blinking)
 280                 blink_rate = IWL_LED_SOLID;
 281         else
 282                 blink_rate = blink_tbl[i].on_time;
 283
 284         return blink_rate;
 285 }
 286
 287 static inline int is_rf_kill(struct iwl_priv *priv)
 288 {
 289         return test_bit(STATUS_RF_KILL_HW, &priv->status) ||
 290                 test_bit(STATUS_RF_KILL_SW, &priv->status);
 291 }
 292
 293 /*
 294  * this function called from handler. Since setting Led command can
 295  * happen very frequent we postpone led command to be called from
 296  * REPLY handler so we know ucode is up
 297  */
 298 void iwl_leds_background(struct iwl_priv *priv)
 299 {
 300         u8 blink_rate;
 301
 302         if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
 303                 priv->last_blink_time = 0;
 304                 return;
 305         }
 306         if (is_rf_kill(priv)) {
 307                 priv->last_blink_time = 0;
 308                 return;
 309         }
 310
 311         if (!priv->allow_blinking) {
 312                 priv->last_blink_time = 0;
 313                 if (priv->last_blink_rate != IWL_LED_SOLID) {
 314                         priv->last_blink_rate = IWL_LED_SOLID;
 315                         iwl4965_led_on(priv, IWL_LED_LINK);
 316                 }
 317                 return;
 318         }
 319         if (!priv->last_blink_time ||
 320             !time_after(jiffies, priv->last_blink_time +
 321                         msecs_to_jiffies(1000)))
 322                 return;
 323
 324         blink_rate = get_blink_rate(priv);
 325
 326         /* call only if blink rate change */
 327         if (blink_rate != priv->last_blink_rate) {
 328                 if (blink_rate != IWL_LED_SOLID) {
 329                         priv->last_blink_time = jiffies +
 330                                                 msecs_to_jiffies(1000);
 331                         iwl4965_led_not_solid(priv, IWL_LED_LINK, blink_rate);
 332                 } else {
 333                         priv->last_blink_time = 0;
 334                         iwl4965_led_on(priv, IWL_LED_LINK);
 335                 }
 336         }
 337
 338         priv->last_blink_rate = blink_rate;
 339 }
 340 EXPORT_SYMBOL(iwl_leds_background);
 341
 342 /* Register all led handler */
 343 int iwl_leds_register(struct iwl_priv *priv)
 344 {
 345         char *trigger;
 346         char name[32];
 347         int ret;
 348
 349         priv->last_blink_rate = 0;
 350         priv->led_tpt = 0;
 351         priv->last_blink_time = 0;
 352         priv->allow_blinking = 0;
 353
 354         trigger = ieee80211_get_radio_led_name(priv->hw);
 355         snprintf(name, sizeof(name), "iwl-%s:radio",
 356                  wiphy_name(priv->hw->wiphy));
 357
 358         priv->led[IWL_LED_TRG_RADIO].led_on = iwl4965_led_on_reg;
 359         priv->led[IWL_LED_TRG_RADIO].led_off = iwl4965_led_off_reg;
 360         priv->led[IWL_LED_TRG_RADIO].led_pattern = NULL;
 361
 362         ret = iwl_leds_register_led(priv,
 363                                    &priv->led[IWL_LED_TRG_RADIO],
 364                                    IWL_LED_TRG_RADIO, 1,
 365                                    name, trigger);
 366         if (ret)
 367                 goto exit_fail;
 368
 369         trigger = ieee80211_get_assoc_led_name(priv->hw);
 370         snprintf(name, sizeof(name), "iwl-%s:assoc",
 371                  wiphy_name(priv->hw->wiphy));
 372
 373         ret = iwl_leds_register_led(priv,
 374                                    &priv->led[IWL_LED_TRG_ASSOC],
 375                                    IWL_LED_TRG_ASSOC, 0,
 376                                    name, trigger);
 377         /* for assoc always turn led on */
 378         priv->led[IWL_LED_TRG_ASSOC].led_on = iwl4965_led_on_reg;
 379         priv->led[IWL_LED_TRG_ASSOC].led_off = iwl4965_led_on_reg;
 380         priv->led[IWL_LED_TRG_ASSOC].led_pattern = NULL;
 381
 382         if (ret)
 383                 goto exit_fail;
 384
 385         trigger = ieee80211_get_rx_led_name(priv->hw);
 386         snprintf(name, sizeof(name), "iwl-%s:RX",
 387                  wiphy_name(priv->hw->wiphy));
 388
 389
 390         ret = iwl_leds_register_led(priv,
 391                                    &priv->led[IWL_LED_TRG_RX],
 392                                    IWL_LED_TRG_RX, 0,
 393                                    name, trigger);
 394
 395         priv->led[IWL_LED_TRG_RX].led_on = iwl4965_led_associated;
 396         priv->led[IWL_LED_TRG_RX].led_off = iwl4965_led_associated;
 397         priv->led[IWL_LED_TRG_RX].led_pattern = iwl4965_led_pattern;
 398
 399         if (ret)
 400                 goto exit_fail;
 401
 402         trigger = ieee80211_get_tx_led_name(priv->hw);
 403         snprintf(name, sizeof(name), "iwl-%s:TX",
 404                  wiphy_name(priv->hw->wiphy));
 405         ret = iwl_leds_register_led(priv,
 406                                    &priv->led[IWL_LED_TRG_TX],
 407                                    IWL_LED_TRG_TX, 0,
 408                                    name, trigger);
 409         priv->led[IWL_LED_TRG_TX].led_on = iwl4965_led_associated;
 410         priv->led[IWL_LED_TRG_TX].led_off = iwl4965_led_associated;
 411         priv->led[IWL_LED_TRG_TX].led_pattern = iwl4965_led_pattern;
 412
 413         if (ret)
 414                 goto exit_fail;
 415
 416         return 0;
 417
 418 exit_fail:
 419         iwl_leds_unregister(priv);
 420         return ret;
 421 }
 422 EXPORT_SYMBOL(iwl_leds_register);
 423
 424 /* unregister led class */
 425 static void iwl_leds_unregister_led(struct iwl4965_led *led, u8 set_led)
 426 {
 427         if (!led->registered)
 428                 return;
 429
 430         led_classdev_unregister(&led->led_dev);
 431
 432         if (set_led)
 433                 led->led_dev.brightness_set(&led->led_dev, LED_OFF);
 434         led->registered = 0;
 435 }
 436
 437 /* Unregister all led handlers */
 438 void iwl_leds_unregister(struct iwl_priv *priv)
 439 {
 440         iwl_leds_unregister_led(&priv->led[IWL_LED_TRG_ASSOC], 0);
 441         iwl_leds_unregister_led(&priv->led[IWL_LED_TRG_RX], 0);
 442         iwl_leds_unregister_led(&priv->led[IWL_LED_TRG_TX], 0);
 443         iwl_leds_unregister_led(&priv->led[IWL_LED_TRG_RADIO], 1);
 444 }
 445 EXPORT_SYMBOL(iwl_leds_unregister);
 446