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.h"
  43
  44
  45 static const struct {
  46         u16 brightness;
  47         u8 on_time;
  48         u8 off_time;
  49 } blink_tbl[] =
  50 {
  51         {300, 25, 25},
  52         {200, 40, 40},
  53         {100, 55, 55},
  54         {70, 65, 65},
  55         {50, 75, 75},
  56         {20, 85, 85},
  57         {15, 95, 95 },
  58         {10, 110, 110},
  59         {5, 130, 130},
  60         {0, 167, 167},
  61         /*SOLID_ON*/
  62         {-1, IWL_LED_SOLID, 0}
  63 };
  64
  65 #define IWL_1MB_RATE (128 * 1024)
  66 #define IWL_LED_THRESHOLD (16)
  67 #define IWL_MAX_BLINK_TBL (ARRAY_SIZE(blink_tbl) - 1) /*Exclude Solid on*/
  68 #define IWL_SOLID_BLINK_IDX (ARRAY_SIZE(blink_tbl) - 1)
  69
  70 static int iwl3945_led_cmd_callback(struct iwl_priv *priv,
  71                                     struct iwl_cmd *cmd,
  72                                     struct sk_buff *skb)
  73 {
  74         return 1;
  75 }
  76
  77 static inline int iwl3945_brightness_to_idx(enum led_brightness brightness)
  78 {
  79         return fls(0x000000FF & (u32)brightness);
  80 }
  81
  82 /* Send led command */
  83 static int iwl_send_led_cmd(struct iwl_priv *priv,
  84                             struct iwl_led_cmd *led_cmd)
  85 {
  86         struct iwl_host_cmd cmd = {
  87                 .id = REPLY_LEDS_CMD,
  88                 .len = sizeof(struct iwl_led_cmd),
  89                 .data = led_cmd,
  90                 .meta.flags = CMD_ASYNC,
  91                 .meta.u.callback = iwl3945_led_cmd_callback,
  92         };
  93
  94         return iwl3945_send_cmd(priv, &cmd);
  95 }
  96
  97
  98
  99 /* Set led on command */
 100 static int iwl3945_led_pattern(struct iwl_priv *priv, int led_id,
 101                                unsigned int idx)
 102 {
 103         struct iwl_led_cmd led_cmd = {
 104                 .id = led_id,
 105                 .interval = IWL_DEF_LED_INTRVL
 106         };
 107
 108         BUG_ON(idx > IWL_MAX_BLINK_TBL);
 109
 110         led_cmd.on = blink_tbl[idx].on_time;
 111         led_cmd.off = blink_tbl[idx].off_time;
 112
 113         return iwl_send_led_cmd(priv, &led_cmd);
 114 }
 115
 116
 117 /* Set led on command */
 118 static int iwl3945_led_on(struct iwl_priv *priv, int led_id)
 119 {
 120         struct iwl_led_cmd led_cmd = {
 121                 .id = led_id,
 122                 .on = IWL_LED_SOLID,
 123                 .off = 0,
 124                 .interval = IWL_DEF_LED_INTRVL
 125         };
 126         return iwl_send_led_cmd(priv, &led_cmd);
 127 }
 128
 129 /* Set led off command */
 130 static int iwl3945_led_off(struct iwl_priv *priv, int led_id)
 131 {
 132         struct iwl_led_cmd led_cmd = {
 133                 .id = led_id,
 134                 .on = 0,
 135                 .off = 0,
 136                 .interval = IWL_DEF_LED_INTRVL
 137         };
 138         IWL_DEBUG_LED("led off %d\n", led_id);
 139         return iwl_send_led_cmd(priv, &led_cmd);
 140 }
 141
 142 /*
 143  * brightness call back function for Tx/Rx LED
 144  */
 145 static int iwl3945_led_associated(struct iwl_priv *priv, int led_id)
 146 {
 147         if (test_bit(STATUS_EXIT_PENDING, &priv->status) ||
 148             !test_bit(STATUS_READY, &priv->status))
 149                 return 0;
 150
 151
 152         /* start counting Tx/Rx bytes */
 153         if (!priv->last_blink_time && priv->allow_blinking)
 154                 priv->last_blink_time = jiffies;
 155         return 0;
 156 }
 157
 158 /*
 159  * brightness call back for association and radio
 160  */
 161 static void iwl3945_led_brightness_set(struct led_classdev *led_cdev,
 162                                 enum led_brightness brightness)
 163 {
 164         struct iwl3945_led *led = container_of(led_cdev,
 165                                                struct iwl3945_led, led_dev);
 166         struct iwl_priv *priv = led->priv;
 167
 168         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 169                 return;
 170
 171         switch (brightness) {
 172         case LED_FULL:
 173                 if (led->type == IWL_LED_TRG_ASSOC) {
 174                         priv->allow_blinking = 1;
 175                         IWL_DEBUG_LED("MAC is  associated\n");
 176                 }
 177                 if (led->led_on)
 178                         led->led_on(priv, IWL_LED_LINK);
 179                 break;
 180         case LED_OFF:
 181                 if (led->type == IWL_LED_TRG_ASSOC) {
 182                         priv->allow_blinking = 0;
 183                         IWL_DEBUG_LED("MAC is disassociated\n");
 184                 }
 185                 if (led->led_off)
 186                         led->led_off(priv, IWL_LED_LINK);
 187                 break;
 188         default:
 189                 if (led->led_pattern) {
 190                         int idx = iwl3945_brightness_to_idx(brightness);
 191                         led->led_pattern(priv, IWL_LED_LINK, idx);
 192                 }
 193                 break;
 194         }
 195 }
 196
 197
 198
 199 /*
 200  * Register led class with the system
 201  */
 202 static int iwl3945_led_register_led(struct iwl_priv *priv,
 203                                    struct iwl3945_led *led,
 204                                    enum led_type type, u8 set_led,
 205                                    char *trigger)
 206 {
 207         struct device *device = wiphy_dev(priv->hw->wiphy);
 208         int ret;
 209
 210         led->led_dev.name = led->name;
 211         led->led_dev.brightness_set = iwl3945_led_brightness_set;
 212         led->led_dev.default_trigger = trigger;
 213
 214         led->priv = priv;
 215         led->type = type;
 216
 217         ret = led_classdev_register(device, &led->led_dev);
 218         if (ret) {
 219                 IWL_ERR(priv, "Error: failed to register led handler.\n");
 220                 return ret;
 221         }
 222
 223         led->registered = 1;
 224
 225         if (set_led && led->led_on)
 226                 led->led_on(priv, IWL_LED_LINK);
 227         return 0;
 228 }
 229
 230
 231 /*
 232  * calculate blink rate according to last 2 sec Tx/Rx activities
 233  */
 234 static inline u8 get_blink_rate(struct iwl_priv *priv)
 235 {
 236         int index;
 237         u64 current_tpt = priv->rxtxpackets;
 238         s64 tpt = current_tpt - priv->led_tpt;
 239
 240         if (tpt < 0)
 241                 tpt = -tpt;
 242         priv->led_tpt = current_tpt;
 243
 244         if (!priv->allow_blinking)
 245                 index = IWL_MAX_BLINK_TBL;
 246         else
 247                 for (index = 0; index < IWL_MAX_BLINK_TBL; index++)
 248                         if (tpt > (blink_tbl[index].brightness * IWL_1MB_RATE))
 249                                 break;
 250         return index;
 251 }
 252
 253 static inline int is_rf_kill(struct iwl_priv *priv)
 254 {
 255         return test_bit(STATUS_RF_KILL_HW, &priv->status) ||
 256                 test_bit(STATUS_RF_KILL_SW, &priv->status);
 257 }
 258
 259 /*
 260  * this function called from handler. Since setting Led command can
 261  * happen very frequent we postpone led command to be called from
 262  * REPLY handler so we know ucode is up
 263  */
 264 void iwl3945_led_background(struct iwl_priv *priv)
 265 {
 266         u8 blink_idx;
 267
 268         if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
 269                 priv->last_blink_time = 0;
 270                 return;
 271         }
 272         if (is_rf_kill(priv)) {
 273                 priv->last_blink_time = 0;
 274                 return;
 275         }
 276
 277         if (!priv->allow_blinking) {
 278                 priv->last_blink_time = 0;
 279                 if (priv->last_blink_rate != IWL_SOLID_BLINK_IDX) {
 280                         priv->last_blink_rate = IWL_SOLID_BLINK_IDX;
 281                         iwl3945_led_pattern(priv, IWL_LED_LINK,
 282                                             IWL_SOLID_BLINK_IDX);
 283                 }
 284                 return;
 285         }
 286         if (!priv->last_blink_time ||
 287             !time_after(jiffies, priv->last_blink_time +
 288                         msecs_to_jiffies(1000)))
 289                 return;
 290
 291         blink_idx = get_blink_rate(priv);
 292
 293         /* call only if blink rate change */
 294         if (blink_idx != priv->last_blink_rate)
 295                 iwl3945_led_pattern(priv, IWL_LED_LINK, blink_idx);
 296
 297         priv->last_blink_time = jiffies;
 298         priv->last_blink_rate = blink_idx;
 299         priv->rxtxpackets = 0;
 300 }
 301
 302
 303 /* Register all led handler */
 304 int iwl3945_led_register(struct iwl_priv *priv)
 305 {
 306         char *trigger;
 307         int ret;
 308
 309         priv->last_blink_rate = 0;
 310         priv->rxtxpackets = 0;
 311         priv->led_tpt = 0;
 312         priv->last_blink_time = 0;
 313         priv->allow_blinking = 0;
 314
 315         trigger = ieee80211_get_radio_led_name(priv->hw);
 316         snprintf(priv->led39[IWL_LED_TRG_RADIO].name,
 317                  sizeof(priv->led39[IWL_LED_TRG_RADIO].name), "iwl-%s:radio",
 318                  wiphy_name(priv->hw->wiphy));
 319
 320         priv->led39[IWL_LED_TRG_RADIO].led_on = iwl3945_led_on;
 321         priv->led39[IWL_LED_TRG_RADIO].led_off = iwl3945_led_off;
 322         priv->led39[IWL_LED_TRG_RADIO].led_pattern = NULL;
 323
 324         ret = iwl3945_led_register_led(priv,
 325                                    &priv->led39[IWL_LED_TRG_RADIO],
 326                                    IWL_LED_TRG_RADIO, 1, trigger);
 327
 328         if (ret)
 329                 goto exit_fail;
 330
 331         trigger = ieee80211_get_assoc_led_name(priv->hw);
 332         snprintf(priv->led39[IWL_LED_TRG_ASSOC].name,
 333                  sizeof(priv->led39[IWL_LED_TRG_ASSOC].name), "iwl-%s:assoc",
 334                  wiphy_name(priv->hw->wiphy));
 335
 336         ret = iwl3945_led_register_led(priv,
 337                                    &priv->led39[IWL_LED_TRG_ASSOC],
 338                                    IWL_LED_TRG_ASSOC, 0, trigger);
 339
 340         /* for assoc always turn led on */
 341         priv->led39[IWL_LED_TRG_ASSOC].led_on = iwl3945_led_on;
 342         priv->led39[IWL_LED_TRG_ASSOC].led_off = iwl3945_led_on;
 343         priv->led39[IWL_LED_TRG_ASSOC].led_pattern = NULL;
 344
 345         if (ret)
 346                 goto exit_fail;
 347
 348         trigger = ieee80211_get_rx_led_name(priv->hw);
 349         snprintf(priv->led39[IWL_LED_TRG_RX].name,
 350                  sizeof(priv->led39[IWL_LED_TRG_RX].name), "iwl-%s:RX",
 351                  wiphy_name(priv->hw->wiphy));
 352
 353         ret = iwl3945_led_register_led(priv,
 354                                    &priv->led39[IWL_LED_TRG_RX],
 355                                    IWL_LED_TRG_RX, 0, trigger);
 356
 357         priv->led39[IWL_LED_TRG_RX].led_on = iwl3945_led_associated;
 358         priv->led39[IWL_LED_TRG_RX].led_off = iwl3945_led_associated;
 359         priv->led39[IWL_LED_TRG_RX].led_pattern = iwl3945_led_pattern;
 360
 361         if (ret)
 362                 goto exit_fail;
 363
 364         trigger = ieee80211_get_tx_led_name(priv->hw);
 365         snprintf(priv->led39[IWL_LED_TRG_TX].name,
 366                  sizeof(priv->led39[IWL_LED_TRG_TX].name), "iwl-%s:TX",
 367                  wiphy_name(priv->hw->wiphy));
 368
 369         ret = iwl3945_led_register_led(priv,
 370                                    &priv->led39[IWL_LED_TRG_TX],
 371                                    IWL_LED_TRG_TX, 0, trigger);
 372
 373         priv->led39[IWL_LED_TRG_TX].led_on = iwl3945_led_associated;
 374         priv->led39[IWL_LED_TRG_TX].led_off = iwl3945_led_associated;
 375         priv->led39[IWL_LED_TRG_TX].led_pattern = iwl3945_led_pattern;
 376
 377         if (ret)
 378                 goto exit_fail;
 379
 380         return 0;
 381
 382 exit_fail:
 383         iwl3945_led_unregister(priv);
 384         return ret;
 385 }
 386
 387
 388 /* unregister led class */
 389 static void iwl3945_led_unregister_led(struct iwl3945_led *led, u8 set_led)
 390 {
 391         if (!led->registered)
 392                 return;
 393
 394         led_classdev_unregister(&led->led_dev);
 395
 396         if (set_led)
 397                 led->led_dev.brightness_set(&led->led_dev, LED_OFF);
 398         led->registered = 0;
 399 }
 400
 401 /* Unregister all led handlers */
 402 void iwl3945_led_unregister(struct iwl_priv *priv)
 403 {
 404         iwl3945_led_unregister_led(&priv->led39[IWL_LED_TRG_ASSOC], 0);
 405         iwl3945_led_unregister_led(&priv->led39[IWL_LED_TRG_RX], 0);
 406         iwl3945_led_unregister_led(&priv->led39[IWL_LED_TRG_TX], 0);
 407         iwl3945_led_unregister_led(&priv->led39[IWL_LED_TRG_RADIO], 1);
 408 }
 409