drivers/net/wireless/iwlwifi/iwl-3945-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-commands.h"
  42 #include "iwl-3945.h"
  43 #include "iwl-core.h"
  44 #include "iwl-dev.h"
  45
  46
  47 static const struct {
  48         u16 brightness;
  49         u8 on_time;
  50         u8 off_time;
  51 } blink_tbl[] =
  52 {
  53         {300, 25, 25},
  54         {200, 40, 40},
  55         {100, 55, 55},
  56         {70, 65, 65},
  57         {50, 75, 75},
  58         {20, 85, 85},
  59         {15, 95, 95 },
  60         {10, 110, 110},
  61         {5, 130, 130},
  62         {0, 167, 167},
  63         /*SOLID_ON*/
  64         {-1, IWL_LED_SOLID, 0}
  65 };
  66
  67 #define IWL_1MB_RATE (128 * 1024)
  68 #define IWL_LED_THRESHOLD (16)
  69 #define IWL_MAX_BLINK_TBL (ARRAY_SIZE(blink_tbl) - 1) /*Exclude Solid on*/
  70 #define IWL_SOLID_BLINK_IDX (ARRAY_SIZE(blink_tbl) - 1)
  71
  72 static int iwl3945_led_cmd_callback(struct iwl_priv *priv,
  73                                     struct iwl_cmd *cmd,
  74                                     struct sk_buff *skb)
  75 {
  76         return 1;
  77 }
  78
  79 static inline int iwl3945_brightness_to_idx(enum led_brightness brightness)
  80 {
  81         return fls(0x000000FF & (u32)brightness);
  82 }
  83
  84 /* Send led command */
  85 static int iwl_send_led_cmd(struct iwl_priv *priv,
  86                             struct iwl_led_cmd *led_cmd)
  87 {
  88         struct iwl_host_cmd cmd = {
  89                 .id = REPLY_LEDS_CMD,
  90                 .len = sizeof(struct iwl_led_cmd),
  91                 .data = led_cmd,
  92                 .meta.flags = CMD_ASYNC,
  93                 .meta.u.callback = iwl3945_led_cmd_callback,
  94         };
  95
  96         return iwl_send_cmd(priv, &cmd);
  97 }
  98
  99
 100
 101 /* Set led on command */
 102 static int iwl3945_led_pattern(struct iwl_priv *priv, int led_id,
 103                                unsigned int idx)
 104 {
 105         struct iwl_led_cmd led_cmd = {
 106                 .id = led_id,
 107                 .interval = IWL_DEF_LED_INTRVL
 108         };
 109
 110         BUG_ON(idx > IWL_MAX_BLINK_TBL);
 111
 112         led_cmd.on = blink_tbl[idx].on_time;
 113         led_cmd.off = blink_tbl[idx].off_time;
 114
 115         return iwl_send_led_cmd(priv, &led_cmd);
 116 }
 117
 118
 119 /* Set led on command */
 120 static int iwl3945_led_on(struct iwl_priv *priv, int led_id)
 121 {
 122         struct iwl_led_cmd led_cmd = {
 123                 .id = led_id,
 124                 .on = IWL_LED_SOLID,
 125                 .off = 0,
 126                 .interval = IWL_DEF_LED_INTRVL
 127         };
 128         return iwl_send_led_cmd(priv, &led_cmd);
 129 }
 130
 131 /* Set led off command */
 132 static int iwl3945_led_off(struct iwl_priv *priv, int led_id)
 133 {
 134         struct iwl_led_cmd led_cmd = {
 135                 .id = led_id,
 136                 .on = 0,
 137                 .off = 0,
 138                 .interval = IWL_DEF_LED_INTRVL
 139         };
 140         IWL_DEBUG_LED("led off %d\n", led_id);
 141         return iwl_send_led_cmd(priv, &led_cmd);
 142 }
 143
 144 /*
 145  * brightness call back function for Tx/Rx LED
 146  */
 147 static int iwl3945_led_associated(struct iwl_priv *priv, int led_id)
 148 {
 149         if (test_bit(STATUS_EXIT_PENDING, &priv->status) ||
 150             !test_bit(STATUS_READY, &priv->status))
 151                 return 0;
 152
 153
 154         /* start counting Tx/Rx bytes */
 155         if (!priv->last_blink_time && priv->allow_blinking)
 156                 priv->last_blink_time = jiffies;
 157         return 0;
 158 }
 159
 160 /*
 161  * brightness call back for association and radio
 162  */
 163 static void iwl3945_led_brightness_set(struct led_classdev *led_cdev,
 164                                 enum led_brightness brightness)
 165 {
 166         struct iwl3945_led *led = container_of(led_cdev,
 167                                                struct iwl3945_led, led_dev);
 168         struct iwl_priv *priv = led->priv;
 169
 170         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 171                 return;
 172
 173         switch (brightness) {
 174         case LED_FULL:
 175                 if (led->type == IWL_LED_TRG_ASSOC) {
 176                         priv->allow_blinking = 1;
 177                         IWL_DEBUG_LED("MAC is  associated\n");
 178                 }
 179                 if (led->led_on)
 180                         led->led_on(priv, IWL_LED_LINK);
 181                 break;
 182         case LED_OFF:
 183                 if (led->type == IWL_LED_TRG_ASSOC) {
 184                         priv->allow_blinking = 0;
 185                         IWL_DEBUG_LED("MAC is disassociated\n");
 186                 }
 187                 if (led->led_off)
 188                         led->led_off(priv, IWL_LED_LINK);
 189                 break;
 190         default:
 191                 if (led->led_pattern) {
 192                         int idx = iwl3945_brightness_to_idx(brightness);
 193                         led->led_pattern(priv, IWL_LED_LINK, idx);
 194                 }
 195                 break;
 196         }
 197 }
 198
 199
 200
 201 /*
 202  * Register led class with the system
 203  */
 204 static int iwl3945_led_register_led(struct iwl_priv *priv,
 205                                    struct iwl3945_led *led,
 206                                    enum led_type type, u8 set_led,
 207                                    char *trigger)
 208 {
 209         struct device *device = wiphy_dev(priv->hw->wiphy);
 210         int ret;
 211
 212         led->led_dev.name = led->name;
 213         led->led_dev.brightness_set = iwl3945_led_brightness_set;
 214         led->led_dev.default_trigger = trigger;
 215
 216         led->priv = priv;
 217         led->type = type;
 218
 219         ret = led_classdev_register(device, &led->led_dev);
 220         if (ret) {
 221                 IWL_ERR(priv, "Error: failed to register led handler.\n");
 222                 return ret;
 223         }
 224
 225         led->registered = 1;
 226
 227         if (set_led && led->led_on)
 228                 led->led_on(priv, IWL_LED_LINK);
 229         return 0;
 230 }
 231
 232
 233 /*
 234  * calculate blink rate according to last 2 sec Tx/Rx activities
 235  */
 236 static inline u8 get_blink_rate(struct iwl_priv *priv)
 237 {
 238         int index;
 239         u64 current_tpt = priv->rxtxpackets;
 240         s64 tpt = current_tpt - priv->led_tpt;
 241
 242         if (tpt < 0)
 243                 tpt = -tpt;
 244         priv->led_tpt = current_tpt;
 245
 246         if (!priv->allow_blinking)
 247                 index = IWL_MAX_BLINK_TBL;
 248         else
 249                 for (index = 0; index < IWL_MAX_BLINK_TBL; index++)
 250                         if (tpt > (blink_tbl[index].brightness * IWL_1MB_RATE))
 251                                 break;
 252         return index;
 253 }
 254
 255 static inline int is_rf_kill(struct iwl_priv *priv)
 256 {
 257         return test_bit(STATUS_RF_KILL_HW, &priv->status) ||
 258                 test_bit(STATUS_RF_KILL_SW, &priv->status);
 259 }
 260
 261 /*
 262  * this function called from handler. Since setting Led command can
 263  * happen very frequent we postpone led command to be called from
 264  * REPLY handler so we know ucode is up
 265  */
 266 void iwl3945_led_background(struct iwl_priv *priv)
 267 {
 268         u8 blink_idx;
 269
 270         if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
 271                 priv->last_blink_time = 0;
 272                 return;
 273         }
 274         if (is_rf_kill(priv)) {
 275                 priv->last_blink_time = 0;
 276                 return;
 277         }
 278
 279         if (!priv->allow_blinking) {
 280                 priv->last_blink_time = 0;
 281                 if (priv->last_blink_rate != IWL_SOLID_BLINK_IDX) {
 282                         priv->last_blink_rate = IWL_SOLID_BLINK_IDX;
 283                         iwl3945_led_pattern(priv, IWL_LED_LINK,
 284                                             IWL_SOLID_BLINK_IDX);
 285                 }
 286                 return;
 287         }
 288         if (!priv->last_blink_time ||
 289             !time_after(jiffies, priv->last_blink_time +
 290                         msecs_to_jiffies(1000)))
 291                 return;
 292
 293         blink_idx = get_blink_rate(priv);
 294
 295         /* call only if blink rate change */
 296         if (blink_idx != priv->last_blink_rate)
 297                 iwl3945_led_pattern(priv, IWL_LED_LINK, blink_idx);
 298
 299         priv->last_blink_time = jiffies;
 300         priv->last_blink_rate = blink_idx;
 301         priv->rxtxpackets = 0;
 302 }
 303
 304
 305 /* Register all led handler */
 306 int iwl3945_led_register(struct iwl_priv *priv)
 307 {
 308         char *trigger;
 309         int ret;
 310
 311         priv->last_blink_rate = 0;
 312         priv->rxtxpackets = 0;
 313         priv->led_tpt = 0;
 314         priv->last_blink_time = 0;
 315         priv->allow_blinking = 0;
 316
 317         trigger = ieee80211_get_radio_led_name(priv->hw);
 318         snprintf(priv->led39[IWL_LED_TRG_RADIO].name,
 319                  sizeof(priv->led39[IWL_LED_TRG_RADIO].name), "iwl-%s:radio",
 320                  wiphy_name(priv->hw->wiphy));
 321
 322         priv->led39[IWL_LED_TRG_RADIO].led_on = iwl3945_led_on;
 323         priv->led39[IWL_LED_TRG_RADIO].led_off = iwl3945_led_off;
 324         priv->led39[IWL_LED_TRG_RADIO].led_pattern = NULL;
 325
 326         ret = iwl3945_led_register_led(priv,
 327                                    &priv->led39[IWL_LED_TRG_RADIO],
 328                                    IWL_LED_TRG_RADIO, 1, trigger);
 329
 330         if (ret)
 331                 goto exit_fail;
 332
 333         trigger = ieee80211_get_assoc_led_name(priv->hw);
 334         snprintf(priv->led39[IWL_LED_TRG_ASSOC].name,
 335                  sizeof(priv->led39[IWL_LED_TRG_ASSOC].name), "iwl-%s:assoc",
 336                  wiphy_name(priv->hw->wiphy));
 337
 338         ret = iwl3945_led_register_led(priv,
 339                                    &priv->led39[IWL_LED_TRG_ASSOC],
 340                                    IWL_LED_TRG_ASSOC, 0, trigger);
 341
 342         /* for assoc always turn led on */
 343         priv->led39[IWL_LED_TRG_ASSOC].led_on = iwl3945_led_on;
 344         priv->led39[IWL_LED_TRG_ASSOC].led_off = iwl3945_led_on;
 345         priv->led39[IWL_LED_TRG_ASSOC].led_pattern = NULL;
 346
 347         if (ret)
 348                 goto exit_fail;
 349
 350         trigger = ieee80211_get_rx_led_name(priv->hw);
 351         snprintf(priv->led39[IWL_LED_TRG_RX].name,
 352                  sizeof(priv->led39[IWL_LED_TRG_RX].name), "iwl-%s:RX",
 353                  wiphy_name(priv->hw->wiphy));
 354
 355         ret = iwl3945_led_register_led(priv,
 356                                    &priv->led39[IWL_LED_TRG_RX],
 357                                    IWL_LED_TRG_RX, 0, trigger);
 358
 359         priv->led39[IWL_LED_TRG_RX].led_on = iwl3945_led_associated;
 360         priv->led39[IWL_LED_TRG_RX].led_off = iwl3945_led_associated;
 361         priv->led39[IWL_LED_TRG_RX].led_pattern = iwl3945_led_pattern;
 362
 363         if (ret)
 364                 goto exit_fail;
 365
 366         trigger = ieee80211_get_tx_led_name(priv->hw);
 367         snprintf(priv->led39[IWL_LED_TRG_TX].name,
 368                  sizeof(priv->led39[IWL_LED_TRG_TX].name), "iwl-%s:TX",
 369                  wiphy_name(priv->hw->wiphy));
 370
 371         ret = iwl3945_led_register_led(priv,
 372                                    &priv->led39[IWL_LED_TRG_TX],
 373                                    IWL_LED_TRG_TX, 0, trigger);
 374
 375         priv->led39[IWL_LED_TRG_TX].led_on = iwl3945_led_associated;
 376         priv->led39[IWL_LED_TRG_TX].led_off = iwl3945_led_associated;
 377         priv->led39[IWL_LED_TRG_TX].led_pattern = iwl3945_led_pattern;
 378
 379         if (ret)
 380                 goto exit_fail;
 381
 382         return 0;
 383
 384 exit_fail:
 385         iwl3945_led_unregister(priv);
 386         return ret;
 387 }
 388
 389
 390 /* unregister led class */
 391 static void iwl3945_led_unregister_led(struct iwl3945_led *led, u8 set_led)
 392 {
 393         if (!led->registered)
 394                 return;
 395
 396         led_classdev_unregister(&led->led_dev);
 397
 398         if (set_led)
 399                 led->led_dev.brightness_set(&led->led_dev, LED_OFF);
 400         led->registered = 0;
 401 }
 402
 403 /* Unregister all led handlers */
 404 void iwl3945_led_unregister(struct iwl_priv *priv)
 405 {
 406         iwl3945_led_unregister_led(&priv->led39[IWL_LED_TRG_ASSOC], 0);
 407         iwl3945_led_unregister_led(&priv->led39[IWL_LED_TRG_RX], 0);
 408         iwl3945_led_unregister_led(&priv->led39[IWL_LED_TRG_TX], 0);
 409         iwl3945_led_unregister_led(&priv->led39[IWL_LED_TRG_RADIO], 1);
 410 }
 411