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("radio off\n");
 165         iwl_write32(priv, CSR_LED_REG, CSR_LED_REG_TRUN_OFF);
 166         return 0;
 167 }
 168
 169 /*
 170  * brightness call back function for Tx/Rx LED
 171  */
 172 static int iwl_led_associated(struct iwl_priv *priv, int led_id)
 173 {
 174         if (test_bit(STATUS_EXIT_PENDING, &priv->status) ||
 175             !test_bit(STATUS_READY, &priv->status))
 176                 return 0;
 177
 178
 179         /* start counting Tx/Rx bytes */
 180         if (!priv->last_blink_time && priv->allow_blinking)
 181                 priv->last_blink_time = jiffies;
 182         return 0;
 183 }
 184
 185 /*
 186  * brightness call back for association and radio
 187  */
 188 static void iwl_led_brightness_set(struct led_classdev *led_cdev,
 189                                        enum led_brightness brightness)
 190 {
 191         struct iwl_led *led = container_of(led_cdev, struct iwl_led, led_dev);
 192         struct iwl_priv *priv = led->priv;
 193
 194         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 195                 return;
 196
 197
 198         IWL_DEBUG_LED("Led type = %s brightness = %d\n",
 199                         led_type_str[led->type], brightness);
 200         switch (brightness) {
 201         case LED_FULL:
 202                 if (led->type == IWL_LED_TRG_ASSOC)
 203                         priv->allow_blinking = 1;
 204
 205                 if (led->led_on)
 206                         led->led_on(priv, IWL_LED_LINK);
 207                 break;
 208         case LED_OFF:
 209                 if (led->type == IWL_LED_TRG_ASSOC)
 210                         priv->allow_blinking = 0;
 211
 212                 if (led->led_off)
 213                         led->led_off(priv, IWL_LED_LINK);
 214                 break;
 215         default:
 216                 if (led->led_pattern) {
 217                         int idx = iwl_brightness_to_idx(brightness);
 218                         led->led_pattern(priv, IWL_LED_LINK, idx);
 219                 }
 220                 break;
 221         }
 222 }
 223
 224
 225
 226 /*
 227  * Register led class with the system
 228  */
 229 static int iwl_leds_register_led(struct iwl_priv *priv, struct iwl_led *led,
 230                                    enum led_type type, u8 set_led,
 231                                    const char *name, char *trigger)
 232 {
 233         struct device *device = wiphy_dev(priv->hw->wiphy);
 234         int ret;
 235
 236         led->led_dev.name = name;
 237         led->led_dev.brightness_set = iwl_led_brightness_set;
 238         led->led_dev.default_trigger = trigger;
 239
 240         led->priv = priv;
 241         led->type = type;
 242
 243         ret = led_classdev_register(device, &led->led_dev);
 244         if (ret) {
 245                 IWL_ERROR("Error: failed to register led handler.\n");
 246                 return ret;
 247         }
 248
 249         led->registered = 1;
 250
 251         if (set_led && led->led_on)
 252                 led->led_on(priv, IWL_LED_LINK);
 253
 254         return 0;
 255 }
 256
 257
 258 /*
 259  * calculate blink rate according to last 2 sec Tx/Rx activities
 260  */
 261 static int iwl_get_blink_rate(struct iwl_priv *priv)
 262 {
 263         int i;
 264         u64 current_tpt = priv->tx_stats[2].bytes;
 265         /* FIXME: + priv->rx_stats[2].bytes; */
 266         s64 tpt = current_tpt - priv->led_tpt;
 267
 268         if (tpt < 0) /* wrapparound */
 269                 tpt = -tpt;
 270
 271         IWL_DEBUG_LED("tpt %lld current_tpt %lld\n", tpt, current_tpt);
 272         priv->led_tpt = current_tpt;
 273
 274         if (!priv->allow_blinking)
 275                 i = IWL_MAX_BLINK_TBL;
 276         else
 277                 for (i = 0; i < IWL_MAX_BLINK_TBL; i++)
 278                         if (tpt  > (blink_tbl[i].tpt * IWL_1MB_RATE))
 279                                 break;
 280
 281         IWL_DEBUG_LED("LED BLINK IDX=%d", i);
 282         return i;
 283 }
 284
 285 static inline int is_rf_kill(struct iwl_priv *priv)
 286 {
 287         return test_bit(STATUS_RF_KILL_HW, &priv->status) ||
 288                 test_bit(STATUS_RF_KILL_SW, &priv->status);
 289 }
 290
 291 /*
 292  * this function called from handler. Since setting Led command can
 293  * happen very frequent we postpone led command to be called from
 294  * REPLY handler so we know ucode is up
 295  */
 296 void iwl_leds_background(struct iwl_priv *priv)
 297 {
 298         u8 blink_idx;
 299
 300         if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
 301                 priv->last_blink_time = 0;
 302                 return;
 303         }
 304         if (is_rf_kill(priv)) {
 305                 priv->last_blink_time = 0;
 306                 return;
 307         }
 308
 309         if (!priv->allow_blinking) {
 310                 priv->last_blink_time = 0;
 311                 if (priv->last_blink_rate != IWL_SOLID_BLINK_IDX) {
 312                         priv->last_blink_rate = IWL_SOLID_BLINK_IDX;
 313                         iwl4965_led_pattern(priv, IWL_LED_LINK,
 314                                             IWL_SOLID_BLINK_IDX);
 315                 }
 316                 return;
 317         }
 318         if (!priv->last_blink_time ||
 319             !time_after(jiffies, priv->last_blink_time +
 320                         msecs_to_jiffies(1000)))
 321                 return;
 322
 323         blink_idx = iwl_get_blink_rate(priv);
 324
 325         /* call only if blink rate change */
 326         if (blink_idx != priv->last_blink_rate)
 327                 iwl4965_led_pattern(priv, IWL_LED_LINK, blink_idx);
 328
 329         priv->last_blink_time = jiffies;
 330         priv->last_blink_rate = blink_idx;
 331 }
 332 EXPORT_SYMBOL(iwl_leds_background);
 333
 334 /* Register all led handler */
 335 int iwl_leds_register(struct iwl_priv *priv)
 336 {
 337         char *trigger;
 338         char name[32];
 339         int ret;
 340
 341         priv->last_blink_rate = 0;
 342         priv->led_tpt = 0;
 343         priv->last_blink_time = 0;
 344         priv->allow_blinking = 0;
 345
 346         trigger = ieee80211_get_radio_led_name(priv->hw);
 347         snprintf(name, sizeof(name), "iwl-%s:radio",
 348                  wiphy_name(priv->hw->wiphy));
 349
 350         priv->led[IWL_LED_TRG_RADIO].led_on = iwl4965_led_on_reg;
 351         priv->led[IWL_LED_TRG_RADIO].led_off = iwl4965_led_off_reg;
 352         priv->led[IWL_LED_TRG_RADIO].led_pattern = NULL;
 353
 354         ret = iwl_leds_register_led(priv, &priv->led[IWL_LED_TRG_RADIO],
 355                                    IWL_LED_TRG_RADIO, 1, name, trigger);
 356         if (ret)
 357                 goto exit_fail;
 358
 359         trigger = ieee80211_get_assoc_led_name(priv->hw);
 360         snprintf(name, sizeof(name), "iwl-%s:assoc",
 361                  wiphy_name(priv->hw->wiphy));
 362
 363         ret = iwl_leds_register_led(priv, &priv->led[IWL_LED_TRG_ASSOC],
 364                                    IWL_LED_TRG_ASSOC, 0, name, trigger);
 365
 366         /* for assoc always turn led on */
 367         priv->led[IWL_LED_TRG_ASSOC].led_on = iwl4965_led_on_reg;
 368         priv->led[IWL_LED_TRG_ASSOC].led_off = iwl4965_led_on_reg;
 369         priv->led[IWL_LED_TRG_ASSOC].led_pattern = NULL;
 370
 371         if (ret)
 372                 goto exit_fail;
 373
 374         trigger = ieee80211_get_rx_led_name(priv->hw);
 375         snprintf(name, sizeof(name), "iwl-%s:RX", wiphy_name(priv->hw->wiphy));
 376
 377
 378         ret = iwl_leds_register_led(priv, &priv->led[IWL_LED_TRG_RX],
 379                                    IWL_LED_TRG_RX, 0, name, trigger);
 380
 381         priv->led[IWL_LED_TRG_RX].led_on = iwl_led_associated;
 382         priv->led[IWL_LED_TRG_RX].led_off = iwl_led_associated;
 383         priv->led[IWL_LED_TRG_RX].led_pattern = iwl4965_led_pattern;
 384
 385         if (ret)
 386                 goto exit_fail;
 387
 388         trigger = ieee80211_get_tx_led_name(priv->hw);
 389         snprintf(name, sizeof(name), "iwl-%s:TX", wiphy_name(priv->hw->wiphy));
 390         ret = iwl_leds_register_led(priv, &priv->led[IWL_LED_TRG_TX],
 391                                    IWL_LED_TRG_TX, 0, name, trigger);
 392
 393         priv->led[IWL_LED_TRG_TX].led_on = iwl_led_associated;
 394         priv->led[IWL_LED_TRG_TX].led_off = iwl_led_associated;
 395         priv->led[IWL_LED_TRG_TX].led_pattern = iwl4965_led_pattern;
 396
 397         if (ret)
 398                 goto exit_fail;
 399
 400         return 0;
 401
 402 exit_fail:
 403         iwl_leds_unregister(priv);
 404         return ret;
 405 }
 406 EXPORT_SYMBOL(iwl_leds_register);
 407
 408 /* unregister led class */
 409 static void iwl_leds_unregister_led(struct iwl_led *led, u8 set_led)
 410 {
 411         if (!led->registered)
 412                 return;
 413
 414         led_classdev_unregister(&led->led_dev);
 415
 416         if (set_led)
 417                 led->led_dev.brightness_set(&led->led_dev, LED_OFF);
 418         led->registered = 0;
 419 }
 420
 421 /* Unregister all led handlers */
 422 void iwl_leds_unregister(struct iwl_priv *priv)
 423 {
 424         iwl_leds_unregister_led(&priv->led[IWL_LED_TRG_ASSOC], 0);
 425         iwl_leds_unregister_led(&priv->led[IWL_LED_TRG_RX], 0);
 426         iwl_leds_unregister_led(&priv->led[IWL_LED_TRG_TX], 0);
 427         iwl_leds_unregister_led(&priv->led[IWL_LED_TRG_RADIO], 1);
 428 }
 429 EXPORT_SYMBOL(iwl_leds_unregister);
 430