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-dev.h"
  43 #include "iwl-core.h"
  44 #include "iwl-io.h"
  45 #include "iwl-helpers.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
  58 static const struct {
  59         u16 tpt;
  60         u8 on_time;
  61         u8 off_time;
  62 } blink_tbl[] =
  63 {
  64         {300, 25, 25},
  65         {200, 40, 40},
  66         {100, 55, 55},
  67         {70, 65, 65},
  68         {50, 75, 75},
  69         {20, 85, 85},
  70         {15, 95, 95 },
  71         {10, 110, 110},
  72         {5, 130, 130},
  73         {0, 167, 167},
  74 /* SOLID_ON */
  75         {-1, IWL_LED_SOLID, 0}
  76 };
  77
  78 #define IWL_1MB_RATE (128 * 1024)
  79 #define IWL_LED_THRESHOLD (16)
  80 #define IWL_MAX_BLINK_TBL (ARRAY_SIZE(blink_tbl) - 1) /* exclude SOLID_ON */
  81 #define IWL_SOLID_BLINK_IDX (ARRAY_SIZE(blink_tbl) - 1)
  82
  83 /*  [0-256] -> [0..8] FIXME: we need [0..10] */
  84 static inline int iwl_brightness_to_idx(enum led_brightness brightness)
  85 {
  86         return fls(0x000000FF & (u32)brightness);
  87 }
  88
  89 /* Send led command */
  90 static int iwl_send_led_cmd(struct iwl_priv *priv, struct iwl_led_cmd *led_cmd)
  91 {
  92         struct iwl_host_cmd cmd = {
  93                 .id = REPLY_LEDS_CMD,
  94                 .len = sizeof(struct iwl_led_cmd),
  95                 .data = led_cmd,
  96                 .meta.flags = CMD_ASYNC,
  97                 .meta.u.callback = NULL,
  98         };
  99         u32 reg;
 100
 101         reg = iwl_read32(priv, CSR_LED_REG);
 102         if (reg != (reg & CSR_LED_BSM_CTRL_MSK))
 103                 iwl_write32(priv, CSR_LED_REG, reg & CSR_LED_BSM_CTRL_MSK);
 104
 105         return iwl_send_cmd(priv, &cmd);
 106 }
 107
 108 /* Set led pattern command */
 109 static int iwl4965_led_pattern(struct iwl_priv *priv, int led_id, 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("radio off\n");
 164         iwl_write32(priv, CSR_LED_REG, CSR_LED_REG_TRUN_OFF);
 165         return 0;
 166 }
 167
 168 /*
 169  * brightness call back function for Tx/Rx LED
 170  */
 171 static int iwl_led_associated(struct iwl_priv *priv, int led_id)
 172 {
 173         if (test_bit(STATUS_EXIT_PENDING, &priv->status) ||
 174             !test_bit(STATUS_READY, &priv->status))
 175                 return 0;
 176
 177
 178         /* start counting Tx/Rx bytes */
 179         if (!priv->last_blink_time && priv->allow_blinking)
 180                 priv->last_blink_time = jiffies;
 181         return 0;
 182 }
 183
 184 /*
 185  * brightness call back for association and radio
 186  */
 187 static void iwl_led_brightness_set(struct led_classdev *led_cdev,
 188                                        enum led_brightness brightness)
 189 {
 190         struct iwl_led *led = container_of(led_cdev, struct iwl_led, led_dev);
 191         struct iwl_priv *priv = led->priv;
 192
 193         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 194                 return;
 195
 196
 197         IWL_DEBUG_LED("Led type = %s brightness = %d\n",
 198                         led_type_str[led->type], brightness);
 199         switch (brightness) {
 200         case LED_FULL:
 201                 if (led->type == IWL_LED_TRG_ASSOC)
 202                         priv->allow_blinking = 1;
 203
 204                 if (led->led_on)
 205                         led->led_on(priv, IWL_LED_LINK);
 206                 break;
 207         case LED_OFF:
 208                 if (led->type == IWL_LED_TRG_ASSOC)
 209                         priv->allow_blinking = 0;
 210
 211                 if (led->led_off)
 212                         led->led_off(priv, IWL_LED_LINK);
 213                 break;
 214         default:
 215                 if (led->led_pattern) {
 216                         int idx = iwl_brightness_to_idx(brightness);
 217                         led->led_pattern(priv, IWL_LED_LINK, idx);
 218                 }
 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, struct iwl_led *led,
 229                                    enum led_type type, u8 set_led,
 230                                    const char *name, char *trigger)
 231 {
 232         struct device *device = wiphy_dev(priv->hw->wiphy);
 233         int ret;
 234
 235         led->led_dev.name = name;
 236         led->led_dev.brightness_set = iwl_led_brightness_set;
 237         led->led_dev.default_trigger = trigger;
 238
 239         led->priv = priv;
 240         led->type = type;
 241
 242         ret = led_classdev_register(device, &led->led_dev);
 243         if (ret) {
 244                 IWL_ERROR("Error: failed to register led handler.\n");
 245                 return ret;
 246         }
 247
 248         led->registered = 1;
 249
 250         if (set_led && led->led_on)
 251                 led->led_on(priv, IWL_LED_LINK);
 252
 253         return 0;
 254 }
 255
 256
 257 /*
 258  * calculate blink rate according to last 2 sec Tx/Rx activities
 259  */
 260 static int iwl_get_blink_rate(struct iwl_priv *priv)
 261 {
 262         int i;
 263         u64 current_tpt = priv->tx_stats[2].bytes;
 264         /* FIXME: + priv->rx_stats[2].bytes; */
 265         s64 tpt = current_tpt - priv->led_tpt;
 266
 267         if (tpt < 0) /* wrapparound */
 268                 tpt = -tpt;
 269
 270         IWL_DEBUG_LED("tpt %lld current_tpt %lld\n", tpt, current_tpt);
 271         priv->led_tpt = current_tpt;
 272
 273         if (!priv->allow_blinking)
 274                 i = IWL_MAX_BLINK_TBL;
 275         else
 276                 for (i = 0; i < IWL_MAX_BLINK_TBL; i++)
 277                         if (tpt  > (blink_tbl[i].tpt * IWL_1MB_RATE))
 278                                 break;
 279
 280         IWL_DEBUG_LED("LED BLINK IDX=%d", i);
 281         return i;
 282 }
 283
 284 static inline int is_rf_kill(struct iwl_priv *priv)
 285 {
 286         return test_bit(STATUS_RF_KILL_HW, &priv->status) ||
 287                 test_bit(STATUS_RF_KILL_SW, &priv->status);
 288 }
 289
 290 /*
 291  * this function called from handler. Since setting Led command can
 292  * happen very frequent we postpone led command to be called from
 293  * REPLY handler so we know ucode is up
 294  */
 295 void iwl_leds_background(struct iwl_priv *priv)
 296 {
 297         u8 blink_idx;
 298
 299         if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
 300                 priv->last_blink_time = 0;
 301                 return;
 302         }
 303         if (is_rf_kill(priv)) {
 304                 priv->last_blink_time = 0;
 305                 return;
 306         }
 307
 308         if (!priv->allow_blinking) {
 309                 priv->last_blink_time = 0;
 310                 if (priv->last_blink_rate != IWL_SOLID_BLINK_IDX) {
 311                         priv->last_blink_rate = IWL_SOLID_BLINK_IDX;
 312                         iwl4965_led_pattern(priv, IWL_LED_LINK,
 313                                             IWL_SOLID_BLINK_IDX);
 314                 }
 315                 return;
 316         }
 317         if (!priv->last_blink_time ||
 318             !time_after(jiffies, priv->last_blink_time +
 319                         msecs_to_jiffies(1000)))
 320                 return;
 321
 322         blink_idx = iwl_get_blink_rate(priv);
 323
 324         /* call only if blink rate change */
 325         if (blink_idx != priv->last_blink_rate)
 326                 iwl4965_led_pattern(priv, IWL_LED_LINK, blink_idx);
 327
 328         priv->last_blink_time = jiffies;
 329         priv->last_blink_rate = blink_idx;
 330 }
 331 EXPORT_SYMBOL(iwl_leds_background);
 332
 333 /* Register all led handler */
 334 int iwl_leds_register(struct iwl_priv *priv)
 335 {
 336         char *trigger;
 337         char name[32];
 338         int ret;
 339
 340         priv->last_blink_rate = 0;
 341         priv->led_tpt = 0;
 342         priv->last_blink_time = 0;
 343         priv->allow_blinking = 0;
 344
 345         trigger = ieee80211_get_radio_led_name(priv->hw);
 346         snprintf(name, sizeof(name), "iwl-%s:radio",
 347                  wiphy_name(priv->hw->wiphy));
 348
 349         priv->led[IWL_LED_TRG_RADIO].led_on = iwl4965_led_on_reg;
 350         priv->led[IWL_LED_TRG_RADIO].led_off = iwl4965_led_off_reg;
 351         priv->led[IWL_LED_TRG_RADIO].led_pattern = NULL;
 352
 353         ret = iwl_leds_register_led(priv, &priv->led[IWL_LED_TRG_RADIO],
 354                                    IWL_LED_TRG_RADIO, 1, name, trigger);
 355         if (ret)
 356                 goto exit_fail;
 357
 358         trigger = ieee80211_get_assoc_led_name(priv->hw);
 359         snprintf(name, sizeof(name), "iwl-%s:assoc",
 360                  wiphy_name(priv->hw->wiphy));
 361
 362         ret = iwl_leds_register_led(priv, &priv->led[IWL_LED_TRG_ASSOC],
 363                                    IWL_LED_TRG_ASSOC, 0, name, trigger);
 364
 365         /* for assoc always turn led on */
 366         priv->led[IWL_LED_TRG_ASSOC].led_on = iwl4965_led_on_reg;
 367         priv->led[IWL_LED_TRG_ASSOC].led_off = iwl4965_led_on_reg;
 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(name, sizeof(name), "iwl-%s:RX", wiphy_name(priv->hw->wiphy));
 375
 376
 377         ret = iwl_leds_register_led(priv, &priv->led[IWL_LED_TRG_RX],
 378                                    IWL_LED_TRG_RX, 0, name, trigger);
 379
 380         priv->led[IWL_LED_TRG_RX].led_on = iwl_led_associated;
 381         priv->led[IWL_LED_TRG_RX].led_off = iwl_led_associated;
 382         priv->led[IWL_LED_TRG_RX].led_pattern = iwl4965_led_pattern;
 383
 384         if (ret)
 385                 goto exit_fail;
 386
 387         trigger = ieee80211_get_tx_led_name(priv->hw);
 388         snprintf(name, sizeof(name), "iwl-%s:TX", wiphy_name(priv->hw->wiphy));
 389         ret = iwl_leds_register_led(priv, &priv->led[IWL_LED_TRG_TX],
 390                                    IWL_LED_TRG_TX, 0, name, trigger);
 391
 392         priv->led[IWL_LED_TRG_TX].led_on = iwl_led_associated;
 393         priv->led[IWL_LED_TRG_TX].led_off = iwl_led_associated;
 394         priv->led[IWL_LED_TRG_TX].led_pattern = iwl4965_led_pattern;
 395
 396         if (ret)
 397                 goto exit_fail;
 398
 399         return 0;
 400
 401 exit_fail:
 402         iwl_leds_unregister(priv);
 403         return ret;
 404 }
 405 EXPORT_SYMBOL(iwl_leds_register);
 406
 407 /* unregister led class */
 408 static void iwl_leds_unregister_led(struct iwl_led *led, u8 set_led)
 409 {
 410         if (!led->registered)
 411                 return;
 412
 413         led_classdev_unregister(&led->led_dev);
 414
 415         if (set_led)
 416                 led->led_dev.brightness_set(&led->led_dev, LED_OFF);
 417         led->registered = 0;
 418 }
 419
 420 /* Unregister all led handlers */
 421 void iwl_leds_unregister(struct iwl_priv *priv)
 422 {
 423         iwl_leds_unregister_led(&priv->led[IWL_LED_TRG_ASSOC], 0);
 424         iwl_leds_unregister_led(&priv->led[IWL_LED_TRG_RX], 0);
 425         iwl_leds_unregister_led(&priv->led[IWL_LED_TRG_TX], 0);
 426         iwl_leds_unregister_led(&priv->led[IWL_LED_TRG_RADIO], 1);
 427 }
 428 EXPORT_SYMBOL(iwl_leds_unregister);
 429