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,
 110                                unsigned int idx)
 111 {
 112         struct iwl_led_cmd led_cmd = {
 113                 .id = led_id,
 114                 .interval = IWL_DEF_LED_INTRVL
 115         };
 116
 117         BUG_ON(idx > IWL_MAX_BLINK_TBL);
 118
 119         led_cmd.on = blink_tbl[idx].on_time;
 120         led_cmd.off = blink_tbl[idx].off_time;
 121
 122         return iwl_send_led_cmd(priv, &led_cmd);
 123 }
 124
 125 /* Set led register off */
 126 static int iwl4965_led_on_reg(struct iwl_priv *priv, int led_id)
 127 {
 128         IWL_DEBUG_LED("led on %d\n", led_id);
 129         iwl_write32(priv, CSR_LED_REG, CSR_LED_REG_TRUN_ON);
 130         return 0;
 131 }
 132
 133 #if 0
 134 /* Set led on command */
 135 static int iwl4965_led_on(struct iwl_priv *priv, int led_id)
 136 {
 137         struct iwl_led_cmd led_cmd = {
 138                 .id = led_id,
 139                 .on = IWL_LED_SOLID,
 140                 .off = 0,
 141                 .interval = IWL_DEF_LED_INTRVL
 142         };
 143         return iwl_send_led_cmd(priv, &led_cmd);
 144 }
 145
 146 /* Set led off command */
 147 int iwl4965_led_off(struct iwl_priv *priv, int led_id)
 148 {
 149         struct iwl_led_cmd led_cmd = {
 150                 .id = led_id,
 151                 .on = 0,
 152                 .off = 0,
 153                 .interval = IWL_DEF_LED_INTRVL
 154         };
 155         IWL_DEBUG_LED("led off %d\n", led_id);
 156         return iwl_send_led_cmd(priv, &led_cmd);
 157 }
 158 #endif
 159
 160
 161 /* Set led register off */
 162 static int iwl4965_led_off_reg(struct iwl_priv *priv, int led_id)
 163 {
 164         IWL_DEBUG_LED("LED Reg off\n");
 165         iwl_write32(priv, CSR_LED_REG, CSR_LED_REG_TRUN_OFF);
 166         return 0;
 167 }
 168
 169 /*
 170  * Set led register in case of disassociation according to rfkill state
 171  */
 172 static int iwl_led_associate(struct iwl_priv *priv, int led_id)
 173 {
 174         IWL_DEBUG_LED("Associated\n");
 175         priv->allow_blinking = 1;
 176         return iwl4965_led_on_reg(priv, led_id);
 177 }
 178 static int iwl_led_disassociate(struct iwl_priv *priv, int led_id)
 179 {
 180         priv->allow_blinking = 0;
 181         if (iwl_is_rfkill(priv))
 182                 iwl4965_led_off_reg(priv, led_id);
 183         else
 184                 iwl4965_led_on_reg(priv, led_id);
 185
 186         return 0;
 187 }
 188
 189 /*
 190  * brightness call back function for Tx/Rx LED
 191  */
 192 static int iwl_led_associated(struct iwl_priv *priv, int led_id)
 193 {
 194         if (test_bit(STATUS_EXIT_PENDING, &priv->status) ||
 195             !test_bit(STATUS_READY, &priv->status))
 196                 return 0;
 197
 198
 199         /* start counting Tx/Rx bytes */
 200         if (!priv->last_blink_time && priv->allow_blinking)
 201                 priv->last_blink_time = jiffies;
 202         return 0;
 203 }
 204
 205 /*
 206  * brightness call back for association and radio
 207  */
 208 static void iwl_led_brightness_set(struct led_classdev *led_cdev,
 209                                        enum led_brightness brightness)
 210 {
 211         struct iwl_led *led = container_of(led_cdev, struct iwl_led, led_dev);
 212         struct iwl_priv *priv = led->priv;
 213
 214         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 215                 return;
 216
 217
 218         IWL_DEBUG_LED("Led type = %s brightness = %d\n",
 219                         led_type_str[led->type], brightness);
 220         switch (brightness) {
 221         case LED_FULL:
 222                 if (led->led_on)
 223                         led->led_on(priv, IWL_LED_LINK);
 224                 break;
 225         case LED_OFF:
 226                 if (led->led_off)
 227                         led->led_off(priv, IWL_LED_LINK);
 228                 break;
 229         default:
 230                 if (led->led_pattern) {
 231                         int idx = iwl_brightness_to_idx(brightness);
 232                         led->led_pattern(priv, IWL_LED_LINK, idx);
 233                 }
 234                 break;
 235         }
 236 }
 237
 238
 239
 240 /*
 241  * Register led class with the system
 242  */
 243 static int iwl_leds_register_led(struct iwl_priv *priv, struct iwl_led *led,
 244                                    enum led_type type, u8 set_led,
 245                                    const char *name, char *trigger)
 246 {
 247         struct device *device = wiphy_dev(priv->hw->wiphy);
 248         int ret;
 249
 250         led->led_dev.name = name;
 251         led->led_dev.brightness_set = iwl_led_brightness_set;
 252         led->led_dev.default_trigger = trigger;
 253
 254         led->priv = priv;
 255         led->type = type;
 256
 257         ret = led_classdev_register(device, &led->led_dev);
 258         if (ret) {
 259                 IWL_ERROR("Error: failed to register led handler.\n");
 260                 return ret;
 261         }
 262
 263         led->registered = 1;
 264
 265         if (set_led && led->led_on)
 266                 led->led_on(priv, IWL_LED_LINK);
 267
 268         return 0;
 269 }
 270
 271
 272 /*
 273  * calculate blink rate according to last 2 sec Tx/Rx activities
 274  */
 275 static int iwl_get_blink_rate(struct iwl_priv *priv)
 276 {
 277         int i;
 278         u64 current_tpt = priv->tx_stats[2].bytes;
 279         /* FIXME: + priv->rx_stats[2].bytes; */
 280         s64 tpt = current_tpt - priv->led_tpt;
 281
 282         if (tpt < 0) /* wrapparound */
 283                 tpt = -tpt;
 284
 285         IWL_DEBUG_LED("tpt %lld current_tpt %llu\n",
 286                 (long long)tpt,
 287                 (unsigned long long)current_tpt);
 288         priv->led_tpt = current_tpt;
 289
 290         if (!priv->allow_blinking)
 291                 i = IWL_MAX_BLINK_TBL;
 292         else
 293                 for (i = 0; i < IWL_MAX_BLINK_TBL; i++)
 294                         if (tpt  > (blink_tbl[i].tpt * IWL_1MB_RATE))
 295                                 break;
 296
 297         IWL_DEBUG_LED("LED BLINK IDX=%d", i);
 298         return i;
 299 }
 300
 301 /*
 302  * this function called from handler. Since setting Led command can
 303  * happen very frequent we postpone led command to be called from
 304  * REPLY handler so we know ucode is up
 305  */
 306 void iwl_leds_background(struct iwl_priv *priv)
 307 {
 308         u8 blink_idx;
 309
 310         if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
 311                 priv->last_blink_time = 0;
 312                 return;
 313         }
 314         if (iwl_is_rfkill(priv)) {
 315                 priv->last_blink_time = 0;
 316                 return;
 317         }
 318
 319         if (!priv->allow_blinking) {
 320                 priv->last_blink_time = 0;
 321                 if (priv->last_blink_rate != IWL_SOLID_BLINK_IDX) {
 322                         priv->last_blink_rate = IWL_SOLID_BLINK_IDX;
 323                         iwl4965_led_pattern(priv, IWL_LED_LINK,
 324                                             IWL_SOLID_BLINK_IDX);
 325                 }
 326                 return;
 327         }
 328         if (!priv->last_blink_time ||
 329             !time_after(jiffies, priv->last_blink_time +
 330                         msecs_to_jiffies(1000)))
 331                 return;
 332
 333         blink_idx = iwl_get_blink_rate(priv);
 334
 335         /* call only if blink rate change */
 336         if (blink_idx != priv->last_blink_rate)
 337                 iwl4965_led_pattern(priv, IWL_LED_LINK, blink_idx);
 338
 339         priv->last_blink_time = jiffies;
 340         priv->last_blink_rate = blink_idx;
 341 }
 342 EXPORT_SYMBOL(iwl_leds_background);
 343
 344 /* Register all led handler */
 345 int iwl_leds_register(struct iwl_priv *priv)
 346 {
 347         char *trigger;
 348         char name[32];
 349         int ret;
 350
 351         priv->last_blink_rate = 0;
 352         priv->led_tpt = 0;
 353         priv->last_blink_time = 0;
 354         priv->allow_blinking = 0;
 355
 356         trigger = ieee80211_get_radio_led_name(priv->hw);
 357         snprintf(name, sizeof(name), "iwl-%s:radio",
 358                  wiphy_name(priv->hw->wiphy));
 359
 360         priv->led[IWL_LED_TRG_RADIO].led_on = iwl4965_led_on_reg;
 361         priv->led[IWL_LED_TRG_RADIO].led_off = iwl4965_led_off_reg;
 362         priv->led[IWL_LED_TRG_RADIO].led_pattern = NULL;
 363
 364         ret = iwl_leds_register_led(priv, &priv->led[IWL_LED_TRG_RADIO],
 365                                    IWL_LED_TRG_RADIO, 1, name, trigger);
 366         if (ret)
 367                 goto exit_fail;
 368
 369         trigger = ieee80211_get_assoc_led_name(priv->hw);
 370         snprintf(name, sizeof(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, name, 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(name, sizeof(name), "iwl-%s:RX", wiphy_name(priv->hw->wiphy));
 386
 387
 388         ret = iwl_leds_register_led(priv, &priv->led[IWL_LED_TRG_RX],
 389                                    IWL_LED_TRG_RX, 0, name, trigger);
 390
 391         priv->led[IWL_LED_TRG_RX].led_on = iwl_led_associated;
 392         priv->led[IWL_LED_TRG_RX].led_off = iwl_led_associated;
 393         priv->led[IWL_LED_TRG_RX].led_pattern = iwl4965_led_pattern;
 394
 395         if (ret)
 396                 goto exit_fail;
 397
 398         trigger = ieee80211_get_tx_led_name(priv->hw);
 399         snprintf(name, sizeof(name), "iwl-%s:TX", wiphy_name(priv->hw->wiphy));
 400         ret = iwl_leds_register_led(priv, &priv->led[IWL_LED_TRG_TX],
 401                                    IWL_LED_TRG_TX, 0, name, trigger);
 402
 403         priv->led[IWL_LED_TRG_TX].led_on = iwl_led_associated;
 404         priv->led[IWL_LED_TRG_TX].led_off = iwl_led_associated;
 405         priv->led[IWL_LED_TRG_TX].led_pattern = iwl4965_led_pattern;
 406
 407         if (ret)
 408                 goto exit_fail;
 409
 410         return 0;
 411
 412 exit_fail:
 413         iwl_leds_unregister(priv);
 414         return ret;
 415 }
 416 EXPORT_SYMBOL(iwl_leds_register);
 417
 418 /* unregister led class */
 419 static void iwl_leds_unregister_led(struct iwl_led *led, u8 set_led)
 420 {
 421         if (!led->registered)
 422                 return;
 423
 424         led_classdev_unregister(&led->led_dev);
 425
 426         if (set_led)
 427                 led->led_dev.brightness_set(&led->led_dev, LED_OFF);
 428         led->registered = 0;
 429 }
 430
 431 /* Unregister all led handlers */
 432 void iwl_leds_unregister(struct iwl_priv *priv)
 433 {
 434         iwl_leds_unregister_led(&priv->led[IWL_LED_TRG_ASSOC], 0);
 435         iwl_leds_unregister_led(&priv->led[IWL_LED_TRG_RX], 0);
 436         iwl_leds_unregister_led(&priv->led[IWL_LED_TRG_TX], 0);
 437         iwl_leds_unregister_led(&priv->led[IWL_LED_TRG_RADIO], 1);
 438 }
 439 EXPORT_SYMBOL(iwl_leds_unregister);
 440