drivers/net/wireless/iwlwifi/iwl-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
  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-dev.h"
  42 #include "iwl-core.h"
  43 #include "iwl-io.h"
  44
  45 #ifdef CONFIG_IWLWIFI_DEBUG
  46 static const char *led_type_str[] = {
  47         __stringify(IWL_LED_TRG_TX),
  48         __stringify(IWL_LED_TRG_RX),
  49         __stringify(IWL_LED_TRG_ASSOC),
  50         __stringify(IWL_LED_TRG_RADIO),
  51         NULL
  52 };
  53 #endif /* CONFIG_IWLWIFI_DEBUG */
  54
  55
  56 static const struct {
  57         u16 tpt;        /* Mb/s */
  58         u8 on_time;
  59         u8 off_time;
  60 } blink_tbl[] =
  61 {
  62         {300, 25, 25},
  63         {200, 40, 40},
  64         {100, 55, 55},
  65         {70, 65, 65},
  66         {50, 75, 75},
  67         {20, 85, 85},
  68         {15, 95, 95 },
  69         {10, 110, 110},
  70         {5, 130, 130},
  71         {0, 167, 167},
  72 /* SOLID_ON */
  73         {-1, IWL_LED_SOLID, 0}
  74 };
  75
  76 #define IWL_1MB_RATE (128 * 1024)
  77 #define IWL_LED_THRESHOLD (16)
  78 #define IWL_MAX_BLINK_TBL (ARRAY_SIZE(blink_tbl) - 1) /* exclude SOLID_ON */
  79 #define IWL_SOLID_BLINK_IDX (ARRAY_SIZE(blink_tbl) - 1)
  80
  81 /*  [0-256] -> [0..8] FIXME: we need [0..10] */
  82 static inline int iwl_brightness_to_idx(enum led_brightness brightness)
  83 {
  84         return fls(0x000000FF & (u32)brightness);
  85 }
  86
  87 /* Send led command */
  88 static int iwl_send_led_cmd(struct iwl_priv *priv, struct iwl_led_cmd *led_cmd)
  89 {
  90         struct iwl_host_cmd cmd = {
  91                 .id = REPLY_LEDS_CMD,
  92                 .len = sizeof(struct iwl_led_cmd),
  93                 .data = led_cmd,
  94                 .flags = CMD_ASYNC,
  95                 .callback = NULL,
  96         };
  97         u32 reg;
  98
  99         reg = iwl_read32(priv, CSR_LED_REG);
 100         if (reg != (reg & CSR_LED_BSM_CTRL_MSK))
 101                 iwl_write32(priv, CSR_LED_REG, reg & CSR_LED_BSM_CTRL_MSK);
 102
 103         return iwl_send_cmd(priv, &cmd);
 104 }
 105
 106 /* Set led pattern command */
 107 static int iwl_led_pattern(struct iwl_priv *priv, int led_id,
 108                                unsigned int idx)
 109 {
 110         struct iwl_led_cmd led_cmd = {
 111                 .id = led_id,
 112                 .interval = IWL_DEF_LED_INTRVL
 113         };
 114
 115         BUG_ON(idx > IWL_MAX_BLINK_TBL);
 116
 117         led_cmd.on = blink_tbl[idx].on_time;
 118         led_cmd.off = blink_tbl[idx].off_time;
 119
 120         return iwl_send_led_cmd(priv, &led_cmd);
 121 }
 122
 123 /* Set led register off */
 124 static int iwl_led_on_reg(struct iwl_priv *priv, int led_id)
 125 {
 126         IWL_DEBUG_LED(priv, "led on %d\n", led_id);
 127         iwl_write32(priv, CSR_LED_REG, CSR_LED_REG_TRUN_ON);
 128         return 0;
 129 }
 130
 131 #if 0
 132 /* Set led on command */
 133 static int iwl_led_on(struct iwl_priv *priv, int led_id)
 134 {
 135         struct iwl_led_cmd led_cmd = {
 136                 .id = led_id,
 137                 .on = IWL_LED_SOLID,
 138                 .off = 0,
 139                 .interval = IWL_DEF_LED_INTRVL
 140         };
 141         return iwl_send_led_cmd(priv, &led_cmd);
 142 }
 143
 144 /* Set led off command */
 145 int iwl_led_off(struct iwl_priv *priv, int led_id)
 146 {
 147         struct iwl_led_cmd led_cmd = {
 148                 .id = led_id,
 149                 .on = 0,
 150                 .off = 0,
 151                 .interval = IWL_DEF_LED_INTRVL
 152         };
 153         IWL_DEBUG_LED(priv, "led off %d\n", led_id);
 154         return iwl_send_led_cmd(priv, &led_cmd);
 155 }
 156 #endif
 157
 158
 159 /* Set led register off */
 160 static int iwl_led_off_reg(struct iwl_priv *priv, int led_id)
 161 {
 162         IWL_DEBUG_LED(priv, "LED Reg off\n");
 163         iwl_write32(priv, CSR_LED_REG, CSR_LED_REG_TRUN_OFF);
 164         return 0;
 165 }
 166
 167 /*
 168  * Set led register in case of disassociation according to rfkill state
 169  */
 170 static int iwl_led_associate(struct iwl_priv *priv, int led_id)
 171 {
 172         IWL_DEBUG_LED(priv, "Associated\n");
 173         priv->allow_blinking = 1;
 174         return iwl_led_on_reg(priv, led_id);
 175 }
 176 static int iwl_led_disassociate(struct iwl_priv *priv, int led_id)
 177 {
 178         priv->allow_blinking = 0;
 179
 180         return 0;
 181 }
 182
 183 /*
 184  * brightness call back function for Tx/Rx LED
 185  */
 186 static int iwl_led_associated(struct iwl_priv *priv, int led_id)
 187 {
 188         if (test_bit(STATUS_EXIT_PENDING, &priv->status) ||
 189             !test_bit(STATUS_READY, &priv->status))
 190                 return 0;
 191
 192
 193         /* start counting Tx/Rx bytes */
 194         if (!priv->last_blink_time && priv->allow_blinking)
 195                 priv->last_blink_time = jiffies;
 196         return 0;
 197 }
 198
 199 /*
 200  * brightness call back for association and radio
 201  */
 202 static void iwl_led_brightness_set(struct led_classdev *led_cdev,
 203                                        enum led_brightness brightness)
 204 {
 205         struct iwl_led *led = container_of(led_cdev, struct iwl_led, led_dev);
 206         struct iwl_priv *priv = led->priv;
 207
 208         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 209                 return;
 210
 211
 212         IWL_DEBUG_LED(priv, "Led type = %s brightness = %d\n",
 213                         led_type_str[led->type], brightness);
 214         switch (brightness) {
 215         case LED_FULL:
 216                 if (led->led_on)
 217                         led->led_on(priv, IWL_LED_LINK);
 218                 break;
 219         case LED_OFF:
 220                 if (led->led_off)
 221                         led->led_off(priv, IWL_LED_LINK);
 222                 break;
 223         default:
 224                 if (led->led_pattern) {
 225                         int idx = iwl_brightness_to_idx(brightness);
 226                         led->led_pattern(priv, IWL_LED_LINK, idx);
 227                 }
 228                 break;
 229         }
 230 }
 231
 232
 233
 234 /*
 235  * Register led class with the system
 236  */
 237 static int iwl_leds_register_led(struct iwl_priv *priv, struct iwl_led *led,
 238                                    enum led_type type, u8 set_led,
 239                                    char *trigger)
 240 {
 241         struct device *device = wiphy_dev(priv->hw->wiphy);
 242         int ret;
 243
 244         led->led_dev.name = led->name;
 245         led->led_dev.brightness_set = iwl_led_brightness_set;
 246         led->led_dev.default_trigger = trigger;
 247
 248         led->priv = priv;
 249         led->type = type;
 250
 251         ret = led_classdev_register(device, &led->led_dev);
 252         if (ret) {
 253                 IWL_ERR(priv, "Error: failed to register led handler.\n");
 254                 return ret;
 255         }
 256
 257         led->registered = 1;
 258
 259         if (set_led && led->led_on)
 260                 led->led_on(priv, IWL_LED_LINK);
 261
 262         return 0;
 263 }
 264
 265
 266 /*
 267  * calculate blink rate according to last second Tx/Rx activities
 268  */
 269 static int iwl_get_blink_rate(struct iwl_priv *priv)
 270 {
 271         int i;
 272         /* count both tx and rx traffic to be able to
 273          * handle traffic in either direction
 274          */
 275         u64 current_tpt = priv->tx_stats.data_bytes +
 276                           priv->rx_stats.data_bytes;
 277         s64 tpt = current_tpt - priv->led_tpt;
 278
 279         if (tpt < 0) /* wraparound */
 280                 tpt = -tpt;
 281
 282         IWL_DEBUG_LED(priv, "tpt %lld current_tpt %llu\n",
 283                 (long long)tpt,
 284                 (unsigned long long)current_tpt);
 285         priv->led_tpt = current_tpt;
 286
 287         if (!priv->allow_blinking)
 288                 i = IWL_MAX_BLINK_TBL;
 289         else
 290                 for (i = 0; i < IWL_MAX_BLINK_TBL; i++)
 291                         if (tpt  > (blink_tbl[i].tpt * IWL_1MB_RATE))
 292                                 break;
 293
 294         IWL_DEBUG_LED(priv, "LED BLINK IDX=%d\n", i);
 295         return i;
 296 }
 297
 298 /*
 299  * this function called from handler. Since setting Led command can
 300  * happen very frequent we postpone led command to be called from
 301  * REPLY handler so we know ucode is up
 302  */
 303 void iwl_leds_background(struct iwl_priv *priv)
 304 {
 305         u8 blink_idx;
 306
 307         if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
 308                 priv->last_blink_time = 0;
 309                 return;
 310         }
 311         if (iwl_is_rfkill(priv)) {
 312                 priv->last_blink_time = 0;
 313                 return;
 314         }
 315
 316         if (!priv->allow_blinking) {
 317                 priv->last_blink_time = 0;
 318                 if (priv->last_blink_rate != IWL_SOLID_BLINK_IDX) {
 319                         priv->last_blink_rate = IWL_SOLID_BLINK_IDX;
 320                         iwl_led_pattern(priv, IWL_LED_LINK,
 321                                             IWL_SOLID_BLINK_IDX);
 322                 }
 323                 return;
 324         }
 325         if (!priv->last_blink_time ||
 326             !time_after(jiffies, priv->last_blink_time +
 327                         msecs_to_jiffies(1000)))
 328                 return;
 329
 330         blink_idx = iwl_get_blink_rate(priv);
 331
 332         /* call only if blink rate change */
 333         if (blink_idx != priv->last_blink_rate)
 334                 iwl_led_pattern(priv, IWL_LED_LINK, blink_idx);
 335
 336         priv->last_blink_time = jiffies;
 337         priv->last_blink_rate = blink_idx;
 338 }
 339
 340 /* Register all led handler */
 341 int iwl_leds_register(struct iwl_priv *priv)
 342 {
 343         char *trigger;
 344         int ret;
 345
 346         priv->last_blink_rate = 0;
 347         priv->led_tpt = 0;
 348         priv->last_blink_time = 0;
 349         priv->allow_blinking = 0;
 350
 351         trigger = ieee80211_get_radio_led_name(priv->hw);
 352         snprintf(priv->led[IWL_LED_TRG_RADIO].name,
 353                  sizeof(priv->led[IWL_LED_TRG_RADIO].name), "iwl-%s::radio",
 354                  wiphy_name(priv->hw->wiphy));
 355
 356         priv->led[IWL_LED_TRG_RADIO].led_on = iwl_led_on_reg;
 357         priv->led[IWL_LED_TRG_RADIO].led_off = iwl_led_off_reg;
 358         priv->led[IWL_LED_TRG_RADIO].led_pattern = NULL;
 359
 360         ret = iwl_leds_register_led(priv, &priv->led[IWL_LED_TRG_RADIO],
 361                                    IWL_LED_TRG_RADIO, 1, trigger);
 362         if (ret)
 363                 goto exit_fail;
 364
 365         trigger = ieee80211_get_assoc_led_name(priv->hw);
 366         snprintf(priv->led[IWL_LED_TRG_ASSOC].name,
 367                  sizeof(priv->led[IWL_LED_TRG_ASSOC].name), "iwl-%s::assoc",
 368                  wiphy_name(priv->hw->wiphy));
 369
 370         ret = iwl_leds_register_led(priv, &priv->led[IWL_LED_TRG_ASSOC],
 371                                    IWL_LED_TRG_ASSOC, 0, trigger);
 372
 373         /* for assoc always turn led on */
 374         priv->led[IWL_LED_TRG_ASSOC].led_on = iwl_led_associate;
 375         priv->led[IWL_LED_TRG_ASSOC].led_off = iwl_led_disassociate;
 376         priv->led[IWL_LED_TRG_ASSOC].led_pattern = NULL;
 377
 378         if (ret)
 379                 goto exit_fail;
 380
 381         trigger = ieee80211_get_rx_led_name(priv->hw);
 382         snprintf(priv->led[IWL_LED_TRG_RX].name,
 383                  sizeof(priv->led[IWL_LED_TRG_RX].name), "iwl-%s::RX",
 384                  wiphy_name(priv->hw->wiphy));
 385
 386         ret = iwl_leds_register_led(priv, &priv->led[IWL_LED_TRG_RX],
 387                                    IWL_LED_TRG_RX, 0, trigger);
 388
 389         priv->led[IWL_LED_TRG_RX].led_on = iwl_led_associated;
 390         priv->led[IWL_LED_TRG_RX].led_off = iwl_led_associated;
 391         priv->led[IWL_LED_TRG_RX].led_pattern = iwl_led_pattern;
 392
 393         if (ret)
 394                 goto exit_fail;
 395
 396         trigger = ieee80211_get_tx_led_name(priv->hw);
 397         snprintf(priv->led[IWL_LED_TRG_TX].name,
 398                  sizeof(priv->led[IWL_LED_TRG_TX].name), "iwl-%s::TX",
 399                  wiphy_name(priv->hw->wiphy));
 400
 401         ret = iwl_leds_register_led(priv, &priv->led[IWL_LED_TRG_TX],
 402                                    IWL_LED_TRG_TX, 0, trigger);
 403
 404         priv->led[IWL_LED_TRG_TX].led_on = iwl_led_associated;
 405         priv->led[IWL_LED_TRG_TX].led_off = iwl_led_associated;
 406         priv->led[IWL_LED_TRG_TX].led_pattern = iwl_led_pattern;
 407
 408         if (ret)
 409                 goto exit_fail;
 410
 411         return 0;
 412
 413 exit_fail:
 414         iwl_leds_unregister(priv);
 415         return ret;
 416 }
 417 EXPORT_SYMBOL(iwl_leds_register);
 418
 419 /* unregister led class */
 420 static void iwl_leds_unregister_led(struct iwl_led *led, u8 set_led)
 421 {
 422         if (!led->registered)
 423                 return;
 424
 425         led_classdev_unregister(&led->led_dev);
 426
 427         if (set_led)
 428                 led->led_dev.brightness_set(&led->led_dev, LED_OFF);
 429         led->registered = 0;
 430 }
 431
 432 /* Unregister all led handlers */
 433 void iwl_leds_unregister(struct iwl_priv *priv)
 434 {
 435         iwl_leds_unregister_led(&priv->led[IWL_LED_TRG_ASSOC], 0);
 436         iwl_leds_unregister_led(&priv->led[IWL_LED_TRG_RX], 0);
 437         iwl_leds_unregister_led(&priv->led[IWL_LED_TRG_TX], 0);
 438         iwl_leds_unregister_led(&priv->led[IWL_LED_TRG_RADIO], 1);
 439 }
 440 EXPORT_SYMBOL(iwl_leds_unregister);
 441