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  *  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 #include "iwl-helpers.h"
  45
  46 #ifdef CONFIG_IWLWIFI_DEBUG
  47 static const char *led_type_str[] = {
  48         __stringify(IWL_LED_TRG_TX),
  49         __stringify(IWL_LED_TRG_RX),
  50         __stringify(IWL_LED_TRG_ASSOC),
  51         __stringify(IWL_LED_TRG_RADIO),
  52         NULL
  53 };
  54 #endif /* CONFIG_IWLWIFI_DEBUG */
  55
  56
  57 static const struct {
  58         u16 tpt;
  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 /*  [0-256] -> [0..8] FIXME: we need [0..10] */
  83 static inline int iwl_brightness_to_idx(enum led_brightness brightness)
  84 {
  85         return fls(0x000000FF & (u32)brightness);
  86 }
  87
  88 /* Send led command */
  89 static int iwl_send_led_cmd(struct iwl_priv *priv, struct iwl_led_cmd *led_cmd)
  90 {
  91         struct iwl_host_cmd cmd = {
  92                 .id = REPLY_LEDS_CMD,
  93                 .len = sizeof(struct iwl_led_cmd),
  94                 .data = led_cmd,
  95                 .meta.flags = CMD_ASYNC,
  96                 .meta.u.callback = NULL,
  97         };
  98         u32 reg;
  99
 100         reg = iwl_read32(priv, CSR_LED_REG);
 101         if (reg != (reg & CSR_LED_BSM_CTRL_MSK))
 102                 iwl_write32(priv, CSR_LED_REG, reg & CSR_LED_BSM_CTRL_MSK);
 103
 104         return iwl_send_cmd(priv, &cmd);
 105 }
 106
 107 /* Set led pattern command */
 108 static int iwl4965_led_pattern(struct iwl_priv *priv, int led_id,
 109                                unsigned int idx)
 110 {
 111         struct iwl_led_cmd led_cmd = {
 112                 .id = led_id,
 113                 .interval = IWL_DEF_LED_INTRVL
 114         };
 115
 116         BUG_ON(idx > IWL_MAX_BLINK_TBL);
 117
 118         led_cmd.on = blink_tbl[idx].on_time;
 119         led_cmd.off = blink_tbl[idx].off_time;
 120
 121         return iwl_send_led_cmd(priv, &led_cmd);
 122 }
 123
 124 /* Set led register off */
 125 static int iwl4965_led_on_reg(struct iwl_priv *priv, int led_id)
 126 {
 127         IWL_DEBUG_LED("led on %d\n", led_id);
 128         iwl_write32(priv, CSR_LED_REG, CSR_LED_REG_TRUN_ON);
 129         return 0;
 130 }
 131
 132 #if 0
 133 /* Set led on command */
 134 static int iwl4965_led_on(struct iwl_priv *priv, int led_id)
 135 {
 136         struct iwl_led_cmd led_cmd = {
 137                 .id = led_id,
 138                 .on = IWL_LED_SOLID,
 139                 .off = 0,
 140                 .interval = IWL_DEF_LED_INTRVL
 141         };
 142         return iwl_send_led_cmd(priv, &led_cmd);
 143 }
 144
 145 /* Set led off command */
 146 int iwl4965_led_off(struct iwl_priv *priv, int led_id)
 147 {
 148         struct iwl_led_cmd led_cmd = {
 149                 .id = led_id,
 150                 .on = 0,
 151                 .off = 0,
 152                 .interval = IWL_DEF_LED_INTRVL
 153         };
 154         IWL_DEBUG_LED("led off %d\n", led_id);
 155         return iwl_send_led_cmd(priv, &led_cmd);
 156 }
 157 #endif
 158
 159
 160 /* Set led register off */
 161 static int iwl4965_led_off_reg(struct iwl_priv *priv, int led_id)
 162 {
 163         IWL_DEBUG_LED("LED Reg off\n");
 164         iwl_write32(priv, CSR_LED_REG, CSR_LED_REG_TRUN_OFF);
 165         return 0;
 166 }
 167
 168 /*
 169  * Set led register in case of disassociation according to rfkill state
 170  */
 171 static int iwl_led_associate(struct iwl_priv *priv, int led_id)
 172 {
 173         IWL_DEBUG_LED("Associated\n");
 174         priv->allow_blinking = 1;
 175         return iwl4965_led_on_reg(priv, led_id);
 176 }
 177 static int iwl_led_disassociate(struct iwl_priv *priv, int led_id)
 178 {
 179         priv->allow_blinking = 0;
 180         if (iwl_is_rfkill(priv))
 181                 iwl4965_led_off_reg(priv, led_id);
 182         else
 183                 iwl4965_led_on_reg(priv, led_id);
 184
 185         return 0;
 186 }
 187
 188 /*
 189  * brightness call back function for Tx/Rx LED
 190  */
 191 static int iwl_led_associated(struct iwl_priv *priv, int led_id)
 192 {
 193         if (test_bit(STATUS_EXIT_PENDING, &priv->status) ||
 194             !test_bit(STATUS_READY, &priv->status))
 195                 return 0;
 196
 197
 198         /* start counting Tx/Rx bytes */
 199         if (!priv->last_blink_time && priv->allow_blinking)
 200                 priv->last_blink_time = jiffies;
 201         return 0;
 202 }
 203
 204 /*
 205  * brightness call back for association and radio
 206  */
 207 static void iwl_led_brightness_set(struct led_classdev *led_cdev,
 208                                        enum led_brightness brightness)
 209 {
 210         struct iwl_led *led = container_of(led_cdev, struct iwl_led, led_dev);
 211         struct iwl_priv *priv = led->priv;
 212
 213         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 214                 return;
 215
 216
 217         IWL_DEBUG_LED("Led type = %s brightness = %d\n",
 218                         led_type_str[led->type], brightness);
 219         switch (brightness) {
 220         case LED_FULL:
 221                 if (led->led_on)
 222                         led->led_on(priv, IWL_LED_LINK);
 223                 break;
 224         case LED_OFF:
 225                 if (led->led_off)
 226                         led->led_off(priv, IWL_LED_LINK);
 227                 break;
 228         default:
 229                 if (led->led_pattern) {
 230                         int idx = iwl_brightness_to_idx(brightness);
 231                         led->led_pattern(priv, IWL_LED_LINK, idx);
 232                 }
 233                 break;
 234         }
 235 }
 236
 237
 238
 239 /*
 240  * Register led class with the system
 241  */
 242 static int iwl_leds_register_led(struct iwl_priv *priv, struct iwl_led *led,
 243                                    enum led_type type, u8 set_led,
 244                                    char *trigger)
 245 {
 246         struct device *device = wiphy_dev(priv->hw->wiphy);
 247         int ret;
 248
 249         led->led_dev.name = led->name;
 250         led->led_dev.brightness_set = iwl_led_brightness_set;
 251         led->led_dev.default_trigger = trigger;
 252
 253         led->priv = priv;
 254         led->type = type;
 255
 256         ret = led_classdev_register(device, &led->led_dev);
 257         if (ret) {
 258                 IWL_ERROR("Error: failed to register led handler.\n");
 259                 return ret;
 260         }
 261
 262         led->registered = 1;
 263
 264         if (set_led && led->led_on)
 265                 led->led_on(priv, IWL_LED_LINK);
 266
 267         return 0;
 268 }
 269
 270
 271 /*
 272  * calculate blink rate according to last 2 sec Tx/Rx activities
 273  */
 274 static int iwl_get_blink_rate(struct iwl_priv *priv)
 275 {
 276         int i;
 277         u64 current_tpt = priv->tx_stats[2].bytes;
 278         /* FIXME: + priv->rx_stats[2].bytes; */
 279         s64 tpt = current_tpt - priv->led_tpt;
 280
 281         if (tpt < 0) /* wraparound */
 282                 tpt = -tpt;
 283
 284         IWL_DEBUG_LED("tpt %lld current_tpt %llu\n",
 285                 (long long)tpt,
 286                 (unsigned long long)current_tpt);
 287         priv->led_tpt = current_tpt;
 288
 289         if (!priv->allow_blinking)
 290                 i = IWL_MAX_BLINK_TBL;
 291         else
 292                 for (i = 0; i < IWL_MAX_BLINK_TBL; i++)
 293                         if (tpt  > (blink_tbl[i].tpt * IWL_1MB_RATE))
 294                                 break;
 295
 296         IWL_DEBUG_LED("LED BLINK IDX=%d", i);
 297         return i;
 298 }
 299
 300 /*
 301  * this function called from handler. Since setting Led command can
 302  * happen very frequent we postpone led command to be called from
 303  * REPLY handler so we know ucode is up
 304  */
 305 void iwl_leds_background(struct iwl_priv *priv)
 306 {
 307         u8 blink_idx;
 308
 309         if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
 310                 priv->last_blink_time = 0;
 311                 return;
 312         }
 313         if (iwl_is_rfkill(priv)) {
 314                 priv->last_blink_time = 0;
 315                 return;
 316         }
 317
 318         if (!priv->allow_blinking) {
 319                 priv->last_blink_time = 0;
 320                 if (priv->last_blink_rate != IWL_SOLID_BLINK_IDX) {
 321                         priv->last_blink_rate = IWL_SOLID_BLINK_IDX;
 322                         iwl4965_led_pattern(priv, IWL_LED_LINK,
 323                                             IWL_SOLID_BLINK_IDX);
 324                 }
 325                 return;
 326         }
 327         if (!priv->last_blink_time ||
 328             !time_after(jiffies, priv->last_blink_time +
 329                         msecs_to_jiffies(1000)))
 330                 return;
 331
 332         blink_idx = iwl_get_blink_rate(priv);
 333
 334         /* call only if blink rate change */
 335         if (blink_idx != priv->last_blink_rate)
 336                 iwl4965_led_pattern(priv, IWL_LED_LINK, blink_idx);
 337
 338         priv->last_blink_time = jiffies;
 339         priv->last_blink_rate = blink_idx;
 340 }
 341 EXPORT_SYMBOL(iwl_leds_background);
 342
 343 /* Register all led handler */
 344 int iwl_leds_register(struct iwl_priv *priv)
 345 {
 346         char *trigger;
 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(priv->led[IWL_LED_TRG_RADIO].name,
 356                  sizeof(priv->led[IWL_LED_TRG_RADIO].name), "iwl-%s:radio",
 357                  wiphy_name(priv->hw->wiphy));
 358
 359         priv->led[IWL_LED_TRG_RADIO].led_on = iwl4965_led_on_reg;
 360         priv->led[IWL_LED_TRG_RADIO].led_off = iwl4965_led_off_reg;
 361         priv->led[IWL_LED_TRG_RADIO].led_pattern = NULL;
 362
 363         ret = iwl_leds_register_led(priv, &priv->led[IWL_LED_TRG_RADIO],
 364                                    IWL_LED_TRG_RADIO, 1, trigger);
 365         if (ret)
 366                 goto exit_fail;
 367
 368         trigger = ieee80211_get_assoc_led_name(priv->hw);
 369         snprintf(priv->led[IWL_LED_TRG_ASSOC].name,
 370                  sizeof(priv->led[IWL_LED_TRG_ASSOC].name), "iwl-%s:assoc",
 371                  wiphy_name(priv->hw->wiphy));
 372
 373         ret = iwl_leds_register_led(priv, &priv->led[IWL_LED_TRG_ASSOC],
 374                                    IWL_LED_TRG_ASSOC, 0, trigger);
 375
 376         /* for assoc always turn led on */
 377         priv->led[IWL_LED_TRG_ASSOC].led_on = iwl_led_associate;
 378         priv->led[IWL_LED_TRG_ASSOC].led_off = iwl_led_disassociate;
 379         priv->led[IWL_LED_TRG_ASSOC].led_pattern = NULL;
 380
 381         if (ret)
 382                 goto exit_fail;
 383
 384         trigger = ieee80211_get_rx_led_name(priv->hw);
 385         snprintf(priv->led[IWL_LED_TRG_RX].name,
 386                  sizeof(priv->led[IWL_LED_TRG_RX].name), "iwl-%s:RX",
 387                  wiphy_name(priv->hw->wiphy));
 388
 389         ret = iwl_leds_register_led(priv, &priv->led[IWL_LED_TRG_RX],
 390                                    IWL_LED_TRG_RX, 0, trigger);
 391
 392         priv->led[IWL_LED_TRG_RX].led_on = iwl_led_associated;
 393         priv->led[IWL_LED_TRG_RX].led_off = iwl_led_associated;
 394         priv->led[IWL_LED_TRG_RX].led_pattern = iwl4965_led_pattern;
 395
 396         if (ret)
 397                 goto exit_fail;
 398
 399         trigger = ieee80211_get_tx_led_name(priv->hw);
 400         snprintf(priv->led[IWL_LED_TRG_TX].name,
 401                  sizeof(priv->led[IWL_LED_TRG_TX].name), "iwl-%s:TX",
 402                  wiphy_name(priv->hw->wiphy));
 403
 404         ret = iwl_leds_register_led(priv, &priv->led[IWL_LED_TRG_TX],
 405                                    IWL_LED_TRG_TX, 0, trigger);
 406
 407         priv->led[IWL_LED_TRG_TX].led_on = iwl_led_associated;
 408         priv->led[IWL_LED_TRG_TX].led_off = iwl_led_associated;
 409         priv->led[IWL_LED_TRG_TX].led_pattern = iwl4965_led_pattern;
 410
 411         if (ret)
 412                 goto exit_fail;
 413
 414         return 0;
 415
 416 exit_fail:
 417         iwl_leds_unregister(priv);
 418         return ret;
 419 }
 420 EXPORT_SYMBOL(iwl_leds_register);
 421
 422 /* unregister led class */
 423 static void iwl_leds_unregister_led(struct iwl_led *led, u8 set_led)
 424 {
 425         if (!led->registered)
 426                 return;
 427
 428         led_classdev_unregister(&led->led_dev);
 429
 430         if (set_led)
 431                 led->led_dev.brightness_set(&led->led_dev, LED_OFF);
 432         led->registered = 0;
 433 }
 434
 435 /* Unregister all led handlers */
 436 void iwl_leds_unregister(struct iwl_priv *priv)
 437 {
 438         iwl_leds_unregister_led(&priv->led[IWL_LED_TRG_ASSOC], 0);
 439         iwl_leds_unregister_led(&priv->led[IWL_LED_TRG_RX], 0);
 440         iwl_leds_unregister_led(&priv->led[IWL_LED_TRG_TX], 0);
 441         iwl_leds_unregister_led(&priv->led[IWL_LED_TRG_RADIO], 1);
 442 }
 443 EXPORT_SYMBOL(iwl_leds_unregister);
 444