drivers/net/wireless/iwlwifi/iwl-3945-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-3945.h"
  43 #include "iwl-helpers.h"
  44
  45
  46 static const struct {
  47         u16 brightness;
  48         u8 on_time;
  49         u8 off_time;
  50 } blink_tbl[] =
  51 {
  52         {300, 25, 25},
  53         {200, 40, 40},
  54         {100, 55, 55},
  55         {70, 65, 65},
  56         {50, 75, 75},
  57         {20, 85, 85},
  58         {15, 95, 95 },
  59         {10, 110, 110},
  60         {5, 130, 130},
  61         {0, 167, 167},
  62         /*SOLID_ON*/
  63         {-1, IWL_LED_SOLID, 0}
  64 };
  65
  66 #define IWL_1MB_RATE (128 * 1024)
  67 #define IWL_LED_THRESHOLD (16)
  68 #define IWL_MAX_BLINK_TBL (ARRAY_SIZE(blink_tbl) - 1) /*Exclude Solid on*/
  69 #define IWL_SOLID_BLINK_IDX (ARRAY_SIZE(blink_tbl) - 1)
  70
  71 static int iwl3945_led_cmd_callback(struct iwl3945_priv *priv,
  72                                     struct iwl3945_cmd *cmd,
  73                                     struct sk_buff *skb)
  74 {
  75         return 1;
  76 }
  77
  78 static inline int iwl3945_brightness_to_idx(enum led_brightness brightness)
  79 {
  80         return fls(0x000000FF & (u32)brightness);
  81 }
  82
  83 /* Send led command */
  84 static int iwl_send_led_cmd(struct iwl3945_priv *priv,
  85                             struct iwl3945_led_cmd *led_cmd)
  86 {
  87         struct iwl3945_host_cmd cmd = {
  88                 .id = REPLY_LEDS_CMD,
  89                 .len = sizeof(struct iwl3945_led_cmd),
  90                 .data = led_cmd,
  91                 .meta.flags = CMD_ASYNC,
  92                 .meta.u.callback = iwl3945_led_cmd_callback,
  93         };
  94
  95         return iwl3945_send_cmd(priv, &cmd);
  96 }
  97
  98
  99
 100 /* Set led on command */
 101 static int iwl3945_led_pattern(struct iwl3945_priv *priv, int led_id,
 102                                unsigned int idx)
 103 {
 104         struct iwl3945_led_cmd led_cmd = {
 105                 .id = led_id,
 106                 .interval = IWL_DEF_LED_INTRVL
 107         };
 108
 109         BUG_ON(idx > IWL_MAX_BLINK_TBL);
 110
 111         led_cmd.on = blink_tbl[idx].on_time;
 112         led_cmd.off = blink_tbl[idx].off_time;
 113
 114         return iwl_send_led_cmd(priv, &led_cmd);
 115 }
 116
 117
 118 #if 1
 119 /* Set led on command */
 120 static int iwl3945_led_on(struct iwl3945_priv *priv, int led_id)
 121 {
 122         struct iwl3945_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 iwl3945_priv *priv, int led_id)
 133 {
 134         struct iwl3945_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 #endif
 144
 145
 146 /*
 147  * brightness call back function for Tx/Rx LED
 148  */
 149 static int iwl3945_led_associated(struct iwl3945_priv *priv, int led_id)
 150 {
 151         if (test_bit(STATUS_EXIT_PENDING, &priv->status) ||
 152             !test_bit(STATUS_READY, &priv->status))
 153                 return 0;
 154
 155
 156         /* start counting Tx/Rx bytes */
 157         if (!priv->last_blink_time && priv->allow_blinking)
 158                 priv->last_blink_time = jiffies;
 159         return 0;
 160 }
 161
 162 /*
 163  * brightness call back for association and radio
 164  */
 165 static void iwl3945_led_brightness_set(struct led_classdev *led_cdev,
 166                                 enum led_brightness brightness)
 167 {
 168         struct iwl3945_led *led = container_of(led_cdev,
 169                                                struct iwl3945_led, led_dev);
 170         struct iwl3945_priv *priv = led->priv;
 171
 172         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 173                 return;
 174
 175         switch (brightness) {
 176         case LED_FULL:
 177                 if (led->type == IWL_LED_TRG_ASSOC) {
 178                         priv->allow_blinking = 1;
 179                         IWL_DEBUG_LED("MAC is  associated\n");
 180                 }
 181                 if (led->led_on)
 182                         led->led_on(priv, IWL_LED_LINK);
 183                 break;
 184         case LED_OFF:
 185                 if (led->type == IWL_LED_TRG_ASSOC) {
 186                         priv->allow_blinking = 0;
 187                         IWL_DEBUG_LED("MAC is disassociated\n");
 188                 }
 189                 if (led->led_off)
 190                         led->led_off(priv, IWL_LED_LINK);
 191                 break;
 192         default:
 193                 if (led->led_pattern) {
 194                         int idx = iwl3945_brightness_to_idx(brightness);
 195                         led->led_pattern(priv, IWL_LED_LINK, idx);
 196                 }
 197                 break;
 198         }
 199 }
 200
 201
 202
 203 /*
 204  * Register led class with the system
 205  */
 206 static int iwl3945_led_register_led(struct iwl3945_priv *priv,
 207                                    struct iwl3945_led *led,
 208                                    enum led_type type, u8 set_led,
 209                                    const char *name, char *trigger)
 210 {
 211         struct device *device = wiphy_dev(priv->hw->wiphy);
 212         int ret;
 213
 214         led->led_dev.name = name;
 215         led->led_dev.brightness_set = iwl3945_led_brightness_set;
 216         led->led_dev.default_trigger = trigger;
 217
 218         led->priv = priv;
 219         led->type = type;
 220
 221         ret = led_classdev_register(device, &led->led_dev);
 222         if (ret) {
 223                 IWL_ERROR("Error: failed to register led handler.\n");
 224                 return ret;
 225         }
 226
 227         led->registered = 1;
 228
 229         if (set_led && led->led_on)
 230                 led->led_on(priv, IWL_LED_LINK);
 231         return 0;
 232 }
 233
 234
 235 /*
 236  * calculate blink rate according to last 2 sec Tx/Rx activities
 237  */
 238 static inline u8 get_blink_rate(struct iwl3945_priv *priv)
 239 {
 240         int index;
 241         u64 current_tpt = priv->rxtxpackets;
 242         s64 tpt = current_tpt - priv->led_tpt;
 243
 244         if (tpt < 0)
 245                 tpt = -tpt;
 246         priv->led_tpt = current_tpt;
 247
 248         if (!priv->allow_blinking)
 249                 index = IWL_MAX_BLINK_TBL;
 250         else
 251                 for (index = 0; index < IWL_MAX_BLINK_TBL; index++)
 252                         if (tpt > (blink_tbl[index].brightness * IWL_1MB_RATE))
 253                                 break;
 254         return index;
 255 }
 256
 257 static inline int is_rf_kill(struct iwl3945_priv *priv)
 258 {
 259         return test_bit(STATUS_RF_KILL_HW, &priv->status) ||
 260                 test_bit(STATUS_RF_KILL_SW, &priv->status);
 261 }
 262
 263 /*
 264  * this function called from handler. Since setting Led command can
 265  * happen very frequent we postpone led command to be called from
 266  * REPLY handler so we know ucode is up
 267  */
 268 void iwl3945_led_background(struct iwl3945_priv *priv)
 269 {
 270         u8 blink_idx;
 271
 272         if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
 273                 priv->last_blink_time = 0;
 274                 return;
 275         }
 276         if (is_rf_kill(priv)) {
 277                 priv->last_blink_time = 0;
 278                 return;
 279         }
 280
 281         if (!priv->allow_blinking) {
 282                 priv->last_blink_time = 0;
 283                 if (priv->last_blink_rate != IWL_SOLID_BLINK_IDX) {
 284                         priv->last_blink_rate = IWL_SOLID_BLINK_IDX;
 285                         iwl3945_led_pattern(priv, IWL_LED_LINK,
 286                                             IWL_SOLID_BLINK_IDX);
 287                 }
 288                 return;
 289         }
 290         if (!priv->last_blink_time ||
 291             !time_after(jiffies, priv->last_blink_time +
 292                         msecs_to_jiffies(1000)))
 293                 return;
 294
 295         blink_idx = get_blink_rate(priv);
 296
 297         /* call only if blink rate change */
 298         if (blink_idx != priv->last_blink_rate)
 299                 iwl3945_led_pattern(priv, IWL_LED_LINK, blink_idx);
 300
 301         priv->last_blink_time = jiffies;
 302         priv->last_blink_rate = blink_idx;
 303         priv->rxtxpackets = 0;
 304 }
 305
 306
 307 /* Register all led handler */
 308 int iwl3945_led_register(struct iwl3945_priv *priv)
 309 {
 310         char *trigger;
 311         char name[32];
 312         int ret;
 313
 314         priv->last_blink_rate = 0;
 315         priv->rxtxpackets = 0;
 316         priv->led_tpt = 0;
 317         priv->last_blink_time = 0;
 318         priv->allow_blinking = 0;
 319
 320         trigger = ieee80211_get_radio_led_name(priv->hw);
 321         snprintf(name, sizeof(name), "iwl-%s:radio",
 322                  wiphy_name(priv->hw->wiphy));
 323
 324         priv->led[IWL_LED_TRG_RADIO].led_on = iwl3945_led_on;
 325         priv->led[IWL_LED_TRG_RADIO].led_off = iwl3945_led_off;
 326         priv->led[IWL_LED_TRG_RADIO].led_pattern = NULL;
 327
 328         ret = iwl3945_led_register_led(priv,
 329                                    &priv->led[IWL_LED_TRG_RADIO],
 330                                    IWL_LED_TRG_RADIO, 1,
 331                                    name, trigger);
 332         if (ret)
 333                 goto exit_fail;
 334
 335         trigger = ieee80211_get_assoc_led_name(priv->hw);
 336         snprintf(name, sizeof(name), "iwl-%s:assoc",
 337                  wiphy_name(priv->hw->wiphy));
 338
 339         ret = iwl3945_led_register_led(priv,
 340                                    &priv->led[IWL_LED_TRG_ASSOC],
 341                                    IWL_LED_TRG_ASSOC, 0,
 342                                    name, trigger);
 343         /* for assoc always turn led on */
 344         priv->led[IWL_LED_TRG_ASSOC].led_on = iwl3945_led_on;
 345         priv->led[IWL_LED_TRG_ASSOC].led_off = iwl3945_led_on;
 346         priv->led[IWL_LED_TRG_ASSOC].led_pattern = NULL;
 347
 348         if (ret)
 349                 goto exit_fail;
 350
 351         trigger = ieee80211_get_rx_led_name(priv->hw);
 352         snprintf(name, sizeof(name), "iwl-%s:RX",
 353                  wiphy_name(priv->hw->wiphy));
 354
 355
 356         ret = iwl3945_led_register_led(priv,
 357                                    &priv->led[IWL_LED_TRG_RX],
 358                                    IWL_LED_TRG_RX, 0,
 359                                    name, trigger);
 360
 361         priv->led[IWL_LED_TRG_RX].led_on = iwl3945_led_associated;
 362         priv->led[IWL_LED_TRG_RX].led_off = iwl3945_led_associated;
 363         priv->led[IWL_LED_TRG_RX].led_pattern = iwl3945_led_pattern;
 364
 365         if (ret)
 366                 goto exit_fail;
 367
 368         trigger = ieee80211_get_tx_led_name(priv->hw);
 369         snprintf(name, sizeof(name), "iwl-%s:TX",
 370                  wiphy_name(priv->hw->wiphy));
 371
 372         ret = iwl3945_led_register_led(priv,
 373                                    &priv->led[IWL_LED_TRG_TX],
 374                                    IWL_LED_TRG_TX, 0,
 375                                    name, trigger);
 376         priv->led[IWL_LED_TRG_TX].led_on = iwl3945_led_associated;
 377         priv->led[IWL_LED_TRG_TX].led_off = iwl3945_led_associated;
 378         priv->led[IWL_LED_TRG_TX].led_pattern = iwl3945_led_pattern;
 379
 380         if (ret)
 381                 goto exit_fail;
 382
 383         return 0;
 384
 385 exit_fail:
 386         iwl3945_led_unregister(priv);
 387         return ret;
 388 }
 389
 390
 391 /* unregister led class */
 392 static void iwl3945_led_unregister_led(struct iwl3945_led *led, u8 set_led)
 393 {
 394         if (!led->registered)
 395                 return;
 396
 397         led_classdev_unregister(&led->led_dev);
 398
 399         if (set_led)
 400                 led->led_dev.brightness_set(&led->led_dev, LED_OFF);
 401         led->registered = 0;
 402 }
 403
 404 /* Unregister all led handlers */
 405 void iwl3945_led_unregister(struct iwl3945_priv *priv)
 406 {
 407         iwl3945_led_unregister_led(&priv->led[IWL_LED_TRG_ASSOC], 0);
 408         iwl3945_led_unregister_led(&priv->led[IWL_LED_TRG_RX], 0);
 409         iwl3945_led_unregister_led(&priv->led[IWL_LED_TRG_TX], 0);
 410         iwl3945_led_unregister_led(&priv->led[IWL_LED_TRG_RADIO], 1);
 411 }
 412