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  *  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-3945.h"
  42 #include "iwl-helpers.h"
  43
  44
  45 static const struct {
  46         u16 brightness;
  47         u8 on_time;
  48         u8 off_time;
  49 } blink_tbl[] =
  50 {
  51         {300, 25, 25},
  52         {200, 40, 40},
  53         {100, 55, 55},
  54         {70, 65, 65},
  55         {50, 75, 75},
  56         {20, 85, 85},
  57         {15, 95, 95 },
  58         {10, 110, 110},
  59         {5, 130, 130},
  60         {0, 167, 167},
  61         /*SOLID_ON*/
  62         {-1, IWL_LED_SOLID, 0}
  63 };
  64
  65 #define IWL_1MB_RATE (128 * 1024)
  66 #define IWL_LED_THRESHOLD (16)
  67 #define IWL_MAX_BLINK_TBL (ARRAY_SIZE(blink_tbl) - 1) /*Exclude Solid on*/
  68 #define IWL_SOLID_BLINK_IDX (ARRAY_SIZE(blink_tbl) - 1)
  69
  70 static int iwl3945_led_cmd_callback(struct iwl3945_priv *priv,
  71                                     struct iwl3945_cmd *cmd,
  72                                     struct sk_buff *skb)
  73 {
  74         return 1;
  75 }
  76
  77 static inline int iwl3945_brightness_to_idx(enum led_brightness brightness)
  78 {
  79         return fls(0x000000FF & (u32)brightness);
  80 }
  81
  82 /* Send led command */
  83 static int iwl_send_led_cmd(struct iwl3945_priv *priv,
  84                             struct iwl3945_led_cmd *led_cmd)
  85 {
  86         struct iwl3945_host_cmd cmd = {
  87                 .id = REPLY_LEDS_CMD,
  88                 .len = sizeof(struct iwl3945_led_cmd),
  89                 .data = led_cmd,
  90                 .meta.flags = CMD_ASYNC,
  91                 .meta.u.callback = iwl3945_led_cmd_callback,
  92         };
  93
  94         return iwl3945_send_cmd(priv, &cmd);
  95 }
  96
  97
  98
  99 /* Set led on command */
 100 static int iwl3945_led_pattern(struct iwl3945_priv *priv, int led_id,
 101                                unsigned int idx)
 102 {
 103         struct iwl3945_led_cmd led_cmd = {
 104                 .id = led_id,
 105                 .interval = IWL_DEF_LED_INTRVL
 106         };
 107
 108         BUG_ON(idx > IWL_MAX_BLINK_TBL);
 109
 110         led_cmd.on = blink_tbl[idx].on_time;
 111         led_cmd.off = blink_tbl[idx].off_time;
 112
 113         return iwl_send_led_cmd(priv, &led_cmd);
 114 }
 115
 116
 117 #if 1
 118 /* Set led on command */
 119 static int iwl3945_led_on(struct iwl3945_priv *priv, int led_id)
 120 {
 121         struct iwl3945_led_cmd led_cmd = {
 122                 .id = led_id,
 123                 .on = IWL_LED_SOLID,
 124                 .off = 0,
 125                 .interval = IWL_DEF_LED_INTRVL
 126         };
 127         return iwl_send_led_cmd(priv, &led_cmd);
 128 }
 129
 130 /* Set led off command */
 131 static int iwl3945_led_off(struct iwl3945_priv *priv, int led_id)
 132 {
 133         struct iwl3945_led_cmd led_cmd = {
 134                 .id = led_id,
 135                 .on = 0,
 136                 .off = 0,
 137                 .interval = IWL_DEF_LED_INTRVL
 138         };
 139         IWL_DEBUG_LED("led off %d\n", led_id);
 140         return iwl_send_led_cmd(priv, &led_cmd);
 141 }
 142 #endif
 143
 144
 145 /*
 146  * brightness call back function for Tx/Rx LED
 147  */
 148 static int iwl3945_led_associated(struct iwl3945_priv *priv, int led_id)
 149 {
 150         if (test_bit(STATUS_EXIT_PENDING, &priv->status) ||
 151             !test_bit(STATUS_READY, &priv->status))
 152                 return 0;
 153
 154
 155         /* start counting Tx/Rx bytes */
 156         if (!priv->last_blink_time && priv->allow_blinking)
 157                 priv->last_blink_time = jiffies;
 158         return 0;
 159 }
 160
 161 /*
 162  * brightness call back for association and radio
 163  */
 164 static void iwl3945_led_brightness_set(struct led_classdev *led_cdev,
 165                                 enum led_brightness brightness)
 166 {
 167         struct iwl3945_led *led = container_of(led_cdev,
 168                                                struct iwl3945_led, led_dev);
 169         struct iwl3945_priv *priv = led->priv;
 170
 171         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 172                 return;
 173
 174         switch (brightness) {
 175         case LED_FULL:
 176                 if (led->type == IWL_LED_TRG_ASSOC) {
 177                         priv->allow_blinking = 1;
 178                         IWL_DEBUG_LED("MAC is  associated\n");
 179                 }
 180                 if (led->led_on)
 181                         led->led_on(priv, IWL_LED_LINK);
 182                 break;
 183         case LED_OFF:
 184                 if (led->type == IWL_LED_TRG_ASSOC) {
 185                         priv->allow_blinking = 0;
 186                         IWL_DEBUG_LED("MAC is disassociated\n");
 187                 }
 188                 if (led->led_off)
 189                         led->led_off(priv, IWL_LED_LINK);
 190                 break;
 191         default:
 192                 if (led->led_pattern) {
 193                         int idx = iwl3945_brightness_to_idx(brightness);
 194                         led->led_pattern(priv, IWL_LED_LINK, idx);
 195                 }
 196                 break;
 197         }
 198 }
 199
 200
 201
 202 /*
 203  * Register led class with the system
 204  */
 205 static int iwl3945_led_register_led(struct iwl3945_priv *priv,
 206                                    struct iwl3945_led *led,
 207                                    enum led_type type, u8 set_led,
 208                                    char *trigger)
 209 {
 210         struct device *device = wiphy_dev(priv->hw->wiphy);
 211         int ret;
 212
 213         led->led_dev.name = led->name;
 214         led->led_dev.brightness_set = iwl3945_led_brightness_set;
 215         led->led_dev.default_trigger = trigger;
 216
 217         led->priv = priv;
 218         led->type = type;
 219
 220         ret = led_classdev_register(device, &led->led_dev);
 221         if (ret) {
 222                 IWL_ERROR("Error: failed to register led handler.\n");
 223                 return ret;
 224         }
 225
 226         led->registered = 1;
 227
 228         if (set_led && led->led_on)
 229                 led->led_on(priv, IWL_LED_LINK);
 230         return 0;
 231 }
 232
 233
 234 /*
 235  * calculate blink rate according to last 2 sec Tx/Rx activities
 236  */
 237 static inline u8 get_blink_rate(struct iwl3945_priv *priv)
 238 {
 239         int index;
 240         u64 current_tpt = priv->rxtxpackets;
 241         s64 tpt = current_tpt - priv->led_tpt;
 242
 243         if (tpt < 0)
 244                 tpt = -tpt;
 245         priv->led_tpt = current_tpt;
 246
 247         if (!priv->allow_blinking)
 248                 index = IWL_MAX_BLINK_TBL;
 249         else
 250                 for (index = 0; index < IWL_MAX_BLINK_TBL; index++)
 251                         if (tpt > (blink_tbl[index].brightness * IWL_1MB_RATE))
 252                                 break;
 253         return index;
 254 }
 255
 256 static inline int is_rf_kill(struct iwl3945_priv *priv)
 257 {
 258         return test_bit(STATUS_RF_KILL_HW, &priv->status) ||
 259                 test_bit(STATUS_RF_KILL_SW, &priv->status);
 260 }
 261
 262 /*
 263  * this function called from handler. Since setting Led command can
 264  * happen very frequent we postpone led command to be called from
 265  * REPLY handler so we know ucode is up
 266  */
 267 void iwl3945_led_background(struct iwl3945_priv *priv)
 268 {
 269         u8 blink_idx;
 270
 271         if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
 272                 priv->last_blink_time = 0;
 273                 return;
 274         }
 275         if (is_rf_kill(priv)) {
 276                 priv->last_blink_time = 0;
 277                 return;
 278         }
 279
 280         if (!priv->allow_blinking) {
 281                 priv->last_blink_time = 0;
 282                 if (priv->last_blink_rate != IWL_SOLID_BLINK_IDX) {
 283                         priv->last_blink_rate = IWL_SOLID_BLINK_IDX;
 284                         iwl3945_led_pattern(priv, IWL_LED_LINK,
 285                                             IWL_SOLID_BLINK_IDX);
 286                 }
 287                 return;
 288         }
 289         if (!priv->last_blink_time ||
 290             !time_after(jiffies, priv->last_blink_time +
 291                         msecs_to_jiffies(1000)))
 292                 return;
 293
 294         blink_idx = get_blink_rate(priv);
 295
 296         /* call only if blink rate change */
 297         if (blink_idx != priv->last_blink_rate)
 298                 iwl3945_led_pattern(priv, IWL_LED_LINK, blink_idx);
 299
 300         priv->last_blink_time = jiffies;
 301         priv->last_blink_rate = blink_idx;
 302         priv->rxtxpackets = 0;
 303 }
 304
 305
 306 /* Register all led handler */
 307 int iwl3945_led_register(struct iwl3945_priv *priv)
 308 {
 309         char *trigger;
 310         int ret;
 311
 312         priv->last_blink_rate = 0;
 313         priv->rxtxpackets = 0;
 314         priv->led_tpt = 0;
 315         priv->last_blink_time = 0;
 316         priv->allow_blinking = 0;
 317
 318         trigger = ieee80211_get_radio_led_name(priv->hw);
 319         snprintf(priv->led[IWL_LED_TRG_RADIO].name,
 320                  sizeof(priv->led[IWL_LED_TRG_RADIO].name), "iwl-%s:radio",
 321                  wiphy_name(priv->hw->wiphy));
 322
 323         priv->led[IWL_LED_TRG_RADIO].led_on = iwl3945_led_on;
 324         priv->led[IWL_LED_TRG_RADIO].led_off = iwl3945_led_off;
 325         priv->led[IWL_LED_TRG_RADIO].led_pattern = NULL;
 326
 327         ret = iwl3945_led_register_led(priv,
 328                                    &priv->led[IWL_LED_TRG_RADIO],
 329                                    IWL_LED_TRG_RADIO, 1, trigger);
 330
 331         if (ret)
 332                 goto exit_fail;
 333
 334         trigger = ieee80211_get_assoc_led_name(priv->hw);
 335         snprintf(priv->led[IWL_LED_TRG_ASSOC].name,
 336                  sizeof(priv->led[IWL_LED_TRG_ASSOC].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, trigger);
 342
 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(priv->led[IWL_LED_TRG_RX].name,
 353                  sizeof(priv->led[IWL_LED_TRG_RX].name), "iwl-%s:RX",
 354                  wiphy_name(priv->hw->wiphy));
 355
 356         ret = iwl3945_led_register_led(priv,
 357                                    &priv->led[IWL_LED_TRG_RX],
 358                                    IWL_LED_TRG_RX, 0, trigger);
 359
 360         priv->led[IWL_LED_TRG_RX].led_on = iwl3945_led_associated;
 361         priv->led[IWL_LED_TRG_RX].led_off = iwl3945_led_associated;
 362         priv->led[IWL_LED_TRG_RX].led_pattern = iwl3945_led_pattern;
 363
 364         if (ret)
 365                 goto exit_fail;
 366
 367         trigger = ieee80211_get_tx_led_name(priv->hw);
 368         snprintf(priv->led[IWL_LED_TRG_TX].name,
 369                  sizeof(priv->led[IWL_LED_TRG_TX].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, trigger);
 375
 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