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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2003 - 2009 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 #ifdef CONFIG_IWLWIFI_LEDS
  28
  29 #include <linux/kernel.h>
  30 #include <linux/module.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-commands.h"
  43 #include "iwl-3945.h"
  44 #include "iwl-core.h"
  45 #include "iwl-dev.h"
  46
  47 #ifdef CONFIG_IWLWIFI_DEBUG
  48 static const char *led_type_str[] = {
  49         __stringify(IWL_LED_TRG_TX),
  50         __stringify(IWL_LED_TRG_RX),
  51         __stringify(IWL_LED_TRG_ASSOC),
  52         __stringify(IWL_LED_TRG_RADIO),
  53         NULL
  54 };
  55 #endif /* CONFIG_IWLWIFI_DEBUG */
  56
  57 static const struct {
  58         u16 brightness;
  59         u8 on_time;
  60         u8 off_time;
  61 } blink_tbl[] =
  62 {
  63         {300, 25, 25},
  64         {200, 40, 40},
  65         {100, 55, 55},
  66         {70, 65, 65},
  67         {50, 75, 75},
  68         {20, 85, 85},
  69         {15, 95, 95 },
  70         {10, 110, 110},
  71         {5, 130, 130},
  72         {0, 167, 167},
  73         /* SOLID_ON */
  74         {-1, IWL_LED_SOLID, 0}
  75 };
  76
  77 #define IWL_1MB_RATE (128 * 1024)
  78 #define IWL_LED_THRESHOLD (16)
  79 #define IWL_MAX_BLINK_TBL (ARRAY_SIZE(blink_tbl) - 1) /*Exclude Solid on*/
  80 #define IWL_SOLID_BLINK_IDX (ARRAY_SIZE(blink_tbl) - 1)
  81
  82 static int iwl3945_led_cmd_callback(struct iwl_priv *priv,
  83                                     struct iwl_cmd *cmd,
  84                                     struct sk_buff *skb)
  85 {
  86         return 1;
  87 }
  88
  89 static inline int iwl3945_brightness_to_idx(enum led_brightness brightness)
  90 {
  91         return fls(0x000000FF & (u32)brightness);
  92 }
  93
  94 /* Send led command */
  95 static int iwl_send_led_cmd(struct iwl_priv *priv,
  96                             struct iwl_led_cmd *led_cmd)
  97 {
  98         struct iwl_host_cmd cmd = {
  99                 .id = REPLY_LEDS_CMD,
 100                 .len = sizeof(struct iwl_led_cmd),
 101                 .data = led_cmd,
 102                 .meta.flags = CMD_ASYNC,
 103                 .meta.u.callback = iwl3945_led_cmd_callback,
 104         };
 105
 106         return iwl_send_cmd(priv, &cmd);
 107 }
 108
 109
 110
 111 /* Set led on command */
 112 static int iwl3945_led_pattern(struct iwl_priv *priv, int led_id,
 113                                unsigned int idx)
 114 {
 115         struct iwl_led_cmd led_cmd = {
 116                 .id = led_id,
 117                 .interval = IWL_DEF_LED_INTRVL
 118         };
 119
 120         BUG_ON(idx > IWL_MAX_BLINK_TBL);
 121
 122         led_cmd.on = blink_tbl[idx].on_time;
 123         led_cmd.off = blink_tbl[idx].off_time;
 124
 125         return iwl_send_led_cmd(priv, &led_cmd);
 126 }
 127
 128
 129 /* Set led on command */
 130 static int iwl3945_led_on(struct iwl_priv *priv, int led_id)
 131 {
 132         struct iwl_led_cmd led_cmd = {
 133                 .id = led_id,
 134                 .on = IWL_LED_SOLID,
 135                 .off = 0,
 136                 .interval = IWL_DEF_LED_INTRVL
 137         };
 138         return iwl_send_led_cmd(priv, &led_cmd);
 139 }
 140
 141 /* Set led off command */
 142 static int iwl3945_led_off(struct iwl_priv *priv, int led_id)
 143 {
 144         struct iwl_led_cmd led_cmd = {
 145                 .id = led_id,
 146                 .on = 0,
 147                 .off = 0,
 148                 .interval = IWL_DEF_LED_INTRVL
 149         };
 150         IWL_DEBUG_LED(priv, "led off %d\n", led_id);
 151         return iwl_send_led_cmd(priv, &led_cmd);
 152 }
 153
 154 /*
 155  *  Set led on in case of association
 156  *  */
 157 static int iwl3945_led_associate(struct iwl_priv *priv, int led_id)
 158 {
 159         IWL_DEBUG_LED(priv, "Associated\n");
 160
 161         priv->allow_blinking = 1;
 162         return iwl3945_led_on(priv, led_id);
 163 }
 164 /* Set Led off in case of disassociation */
 165 static int iwl3945_led_disassociate(struct iwl_priv *priv, int led_id)
 166 {
 167         IWL_DEBUG_LED(priv, "Disassociated\n");
 168
 169         priv->allow_blinking = 0;
 170         if (iwl_is_rfkill(priv))
 171                 iwl3945_led_off(priv, led_id);
 172         else
 173                 iwl3945_led_on(priv, led_id);
 174
 175         return 0;
 176 }
 177
 178 /*
 179  * brightness call back function for Tx/Rx LED
 180  */
 181 static int iwl3945_led_associated(struct iwl_priv *priv, int led_id)
 182 {
 183         if (test_bit(STATUS_EXIT_PENDING, &priv->status) ||
 184             !test_bit(STATUS_READY, &priv->status))
 185                 return 0;
 186
 187
 188         /* start counting Tx/Rx bytes */
 189         if (!priv->last_blink_time && priv->allow_blinking)
 190                 priv->last_blink_time = jiffies;
 191         return 0;
 192 }
 193
 194 /*
 195  * brightness call back for association and radio
 196  */
 197 static void iwl3945_led_brightness_set(struct led_classdev *led_cdev,
 198                                 enum led_brightness brightness)
 199 {
 200         struct iwl_led *led = container_of(led_cdev,
 201                                            struct iwl_led, led_dev);
 202         struct iwl_priv *priv = led->priv;
 203
 204         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 205                 return;
 206
 207         IWL_DEBUG_LED(priv, "Led type = %s brightness = %d\n",
 208                         led_type_str[led->type], brightness);
 209
 210         switch (brightness) {
 211         case LED_FULL:
 212                 if (led->led_on)
 213                         led->led_on(priv, IWL_LED_LINK);
 214                 break;
 215         case LED_OFF:
 216                 if (led->led_off)
 217                         led->led_off(priv, IWL_LED_LINK);
 218                 break;
 219         default:
 220                 if (led->led_pattern) {
 221                         int idx = iwl3945_brightness_to_idx(brightness);
 222                         led->led_pattern(priv, IWL_LED_LINK, idx);
 223                 }
 224                 break;
 225         }
 226 }
 227
 228 /*
 229  * Register led class with the system
 230  */
 231 static int iwl3945_led_register_led(struct iwl_priv *priv,
 232                                    struct iwl_led *led,
 233                                    enum led_type type, u8 set_led,
 234                                    char *trigger)
 235 {
 236         struct device *device = wiphy_dev(priv->hw->wiphy);
 237         int ret;
 238
 239         led->led_dev.name = led->name;
 240         led->led_dev.brightness_set = iwl3945_led_brightness_set;
 241         led->led_dev.default_trigger = trigger;
 242
 243         led->priv = priv;
 244         led->type = type;
 245
 246         ret = led_classdev_register(device, &led->led_dev);
 247         if (ret) {
 248                 IWL_ERR(priv, "Error: failed to register led handler.\n");
 249                 return ret;
 250         }
 251
 252         led->registered = 1;
 253
 254         if (set_led && led->led_on)
 255                 led->led_on(priv, IWL_LED_LINK);
 256         return 0;
 257 }
 258
 259
 260 /*
 261  * calculate blink rate according to last 2 sec Tx/Rx activities
 262  */
 263 static inline u8 get_blink_rate(struct iwl_priv *priv)
 264 {
 265         int index;
 266         s64 tpt = priv->rxtxpackets;
 267
 268         if (tpt < 0)
 269                 tpt = -tpt;
 270
 271         IWL_DEBUG_LED(priv, "tpt %lld \n", (long long)tpt);
 272
 273         if (!priv->allow_blinking)
 274                 index = IWL_MAX_BLINK_TBL;
 275         else
 276                 for (index = 0; index < IWL_MAX_BLINK_TBL; index++)
 277                         if (tpt > (blink_tbl[index].brightness * IWL_1MB_RATE))
 278                                 break;
 279
 280         IWL_DEBUG_LED(priv, "LED BLINK IDX=%d\n", index);
 281         return index;
 282 }
 283
 284 /*
 285  * this function called from handler. Since setting Led command can
 286  * happen very frequent we postpone led command to be called from
 287  * REPLY handler so we know ucode is up
 288  */
 289 void iwl3945_led_background(struct iwl_priv *priv)
 290 {
 291         u8 blink_idx;
 292
 293         if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
 294                 priv->last_blink_time = 0;
 295                 return;
 296         }
 297         if (iwl_is_rfkill(priv)) {
 298                 priv->last_blink_time = 0;
 299                 return;
 300         }
 301
 302         if (!priv->allow_blinking) {
 303                 priv->last_blink_time = 0;
 304                 if (priv->last_blink_rate != IWL_SOLID_BLINK_IDX) {
 305                         priv->last_blink_rate = IWL_SOLID_BLINK_IDX;
 306                         iwl3945_led_pattern(priv, IWL_LED_LINK,
 307                                             IWL_SOLID_BLINK_IDX);
 308                 }
 309                 return;
 310         }
 311         if (!priv->last_blink_time ||
 312             !time_after(jiffies, priv->last_blink_time +
 313                         msecs_to_jiffies(1000)))
 314                 return;
 315
 316         blink_idx = get_blink_rate(priv);
 317
 318         /* call only if blink rate change */
 319         if (blink_idx != priv->last_blink_rate)
 320                 iwl3945_led_pattern(priv, IWL_LED_LINK, blink_idx);
 321
 322         priv->last_blink_time = jiffies;
 323         priv->last_blink_rate = blink_idx;
 324         priv->rxtxpackets = 0;
 325 }
 326
 327
 328 /* Register all led handler */
 329 int iwl3945_led_register(struct iwl_priv *priv)
 330 {
 331         char *trigger;
 332         int ret;
 333
 334         priv->last_blink_rate = 0;
 335         priv->rxtxpackets = 0;
 336         priv->led_tpt = 0;
 337         priv->last_blink_time = 0;
 338         priv->allow_blinking = 0;
 339
 340         trigger = ieee80211_get_radio_led_name(priv->hw);
 341         snprintf(priv->led[IWL_LED_TRG_RADIO].name,
 342                  sizeof(priv->led[IWL_LED_TRG_RADIO].name), "iwl-%s::radio",
 343                  wiphy_name(priv->hw->wiphy));
 344
 345         priv->led[IWL_LED_TRG_RADIO].led_on = iwl3945_led_on;
 346         priv->led[IWL_LED_TRG_RADIO].led_off = iwl3945_led_off;
 347         priv->led[IWL_LED_TRG_RADIO].led_pattern = NULL;
 348
 349         ret = iwl3945_led_register_led(priv,
 350                                    &priv->led[IWL_LED_TRG_RADIO],
 351                                    IWL_LED_TRG_RADIO, 1, trigger);
 352
 353         if (ret)
 354                 goto exit_fail;
 355
 356         trigger = ieee80211_get_assoc_led_name(priv->hw);
 357         snprintf(priv->led[IWL_LED_TRG_ASSOC].name,
 358                  sizeof(priv->led[IWL_LED_TRG_ASSOC].name), "iwl-%s::assoc",
 359                  wiphy_name(priv->hw->wiphy));
 360
 361         ret = iwl3945_led_register_led(priv,
 362                                    &priv->led[IWL_LED_TRG_ASSOC],
 363                                    IWL_LED_TRG_ASSOC, 0, trigger);
 364
 365         /* for assoc always turn led on */
 366         priv->led[IWL_LED_TRG_ASSOC].led_on = iwl3945_led_associate;
 367         priv->led[IWL_LED_TRG_ASSOC].led_off = iwl3945_led_disassociate;
 368         priv->led[IWL_LED_TRG_ASSOC].led_pattern = NULL;
 369
 370         if (ret)
 371                 goto exit_fail;
 372
 373         trigger = ieee80211_get_rx_led_name(priv->hw);
 374         snprintf(priv->led[IWL_LED_TRG_RX].name,
 375                  sizeof(priv->led[IWL_LED_TRG_RX].name), "iwl-%s::RX",
 376                  wiphy_name(priv->hw->wiphy));
 377
 378         ret = iwl3945_led_register_led(priv,
 379                                    &priv->led[IWL_LED_TRG_RX],
 380                                    IWL_LED_TRG_RX, 0, trigger);
 381
 382         priv->led[IWL_LED_TRG_RX].led_on = iwl3945_led_associated;
 383         priv->led[IWL_LED_TRG_RX].led_off = iwl3945_led_associated;
 384         priv->led[IWL_LED_TRG_RX].led_pattern = iwl3945_led_pattern;
 385
 386         if (ret)
 387                 goto exit_fail;
 388
 389         trigger = ieee80211_get_tx_led_name(priv->hw);
 390         snprintf(priv->led[IWL_LED_TRG_TX].name,
 391                  sizeof(priv->led[IWL_LED_TRG_TX].name), "iwl-%s::TX",
 392                  wiphy_name(priv->hw->wiphy));
 393
 394         ret = iwl3945_led_register_led(priv,
 395                                    &priv->led[IWL_LED_TRG_TX],
 396                                    IWL_LED_TRG_TX, 0, trigger);
 397
 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 iwl_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 iwl_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
 435 #endif