drivers/net/wireless/iwlwifi/iwl-led.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2003 - 2011 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-dev.h"
  42 #include "iwl-core.h"
  43 #include "iwl-io.h"
  44
  45 /* default: IWL_LED_BLINK(0) using blinking index table */
  46 static int led_mode;
  47 module_param(led_mode, int, S_IRUGO);
  48 MODULE_PARM_DESC(led_mode, "0=system default, "
  49                 "1=On(RF On)/Off(RF Off), 2=blinking");
  50
  51 /* Throughput           OFF time(ms)    ON time (ms)
  52  *      >300                    25              25
  53  *      >200 to 300             40              40
  54  *      >100 to 200             55              55
  55  *      >70 to 100              65              65
  56  *      >50 to 70               75              75
  57  *      >20 to 50               85              85
  58  *      >10 to 20               95              95
  59  *      >5 to 10                110             110
  60  *      >1 to 5                 130             130
  61  *      >0 to 1                 167             167
  62  *      <=0                                     SOLID ON
  63  */
  64 static const struct ieee80211_tpt_blink iwl_blink[] = {
  65         { .throughput = 0, .blink_time = 334 },
  66         { .throughput = 1 * 1024 - 1, .blink_time = 260 },
  67         { .throughput = 5 * 1024 - 1, .blink_time = 220 },
  68         { .throughput = 10 * 1024 - 1, .blink_time = 190 },
  69         { .throughput = 20 * 1024 - 1, .blink_time = 170 },
  70         { .throughput = 50 * 1024 - 1, .blink_time = 150 },
  71         { .throughput = 70 * 1024 - 1, .blink_time = 130 },
  72         { .throughput = 100 * 1024 - 1, .blink_time = 110 },
  73         { .throughput = 200 * 1024 - 1, .blink_time = 80 },
  74         { .throughput = 300 * 1024 - 1, .blink_time = 50 },
  75 };
  76
  77 /* Set led register off */
  78 void iwlagn_led_enable(struct iwl_priv *priv)
  79 {
  80         iwl_write32(priv, CSR_LED_REG, CSR_LED_REG_TRUN_ON);
  81 }
  82
  83 /*
  84  * Adjust led blink rate to compensate on a MAC Clock difference on every HW
  85  * Led blink rate analysis showed an average deviation of 20% on 5000 series
  86  * and up.
  87  * Need to compensate on the led on/off time per HW according to the deviation
  88  * to achieve the desired led frequency
  89  * The calculation is: (100-averageDeviation)/100 * blinkTime
  90  * For code efficiency the calculation will be:
  91  *     compensation = (100 - averageDeviation) * 64 / 100
  92  *     NewBlinkTime = (compensation * BlinkTime) / 64
  93  */
  94 static inline u8 iwl_blink_compensation(struct iwl_priv *priv,
  95                                     u8 time, u16 compensation)
  96 {
  97         if (!compensation) {
  98                 IWL_ERR(priv, "undefined blink compensation: "
  99                         "use pre-defined blinking time\n");
 100                 return time;
 101         }
 102
 103         return (u8)((time * compensation) >> 6);
 104 }
 105
 106 static int iwl_send_led_cmd(struct iwl_priv *priv, struct iwl_led_cmd *led_cmd)
 107 {
 108         struct iwl_host_cmd cmd = {
 109                 .id = REPLY_LEDS_CMD,
 110                 .len = { sizeof(struct iwl_led_cmd), },
 111                 .data = { led_cmd, },
 112                 .flags = CMD_ASYNC,
 113                 .callback = NULL,
 114         };
 115         u32 reg;
 116
 117         reg = iwl_read32(priv, CSR_LED_REG);
 118         if (reg != (reg & CSR_LED_BSM_CTRL_MSK))
 119                 iwl_write32(priv, CSR_LED_REG, reg & CSR_LED_BSM_CTRL_MSK);
 120
 121         return iwl_send_cmd(priv, &cmd);
 122 }
 123
 124 /* Set led pattern command */
 125 static int iwl_led_cmd(struct iwl_priv *priv,
 126                        unsigned long on,
 127                        unsigned long off)
 128 {
 129         struct iwl_led_cmd led_cmd = {
 130                 .id = IWL_LED_LINK,
 131                 .interval = IWL_DEF_LED_INTRVL
 132         };
 133         int ret;
 134
 135         if (!test_bit(STATUS_READY, &priv->status))
 136                 return -EBUSY;
 137
 138         if (priv->blink_on == on && priv->blink_off == off)
 139                 return 0;
 140
 141         if (off == 0) {
 142                 /* led is SOLID_ON */
 143                 on = IWL_LED_SOLID;
 144         }
 145
 146         IWL_DEBUG_LED(priv, "Led blink time compensation=%u\n",
 147                         priv->cfg->base_params->led_compensation);
 148         led_cmd.on = iwl_blink_compensation(priv, on,
 149                                 priv->cfg->base_params->led_compensation);
 150         led_cmd.off = iwl_blink_compensation(priv, off,
 151                                 priv->cfg->base_params->led_compensation);
 152
 153         ret = iwl_send_led_cmd(priv, &led_cmd);
 154         if (!ret) {
 155                 priv->blink_on = on;
 156                 priv->blink_off = off;
 157         }
 158         return ret;
 159 }
 160
 161 static void iwl_led_brightness_set(struct led_classdev *led_cdev,
 162                                    enum led_brightness brightness)
 163 {
 164         struct iwl_priv *priv = container_of(led_cdev, struct iwl_priv, led);
 165         unsigned long on = 0;
 166
 167         if (brightness > 0)
 168                 on = IWL_LED_SOLID;
 169
 170         iwl_led_cmd(priv, on, 0);
 171 }
 172
 173 static int iwl_led_blink_set(struct led_classdev *led_cdev,
 174                              unsigned long *delay_on,
 175                              unsigned long *delay_off)
 176 {
 177         struct iwl_priv *priv = container_of(led_cdev, struct iwl_priv, led);
 178
 179         return iwl_led_cmd(priv, *delay_on, *delay_off);
 180 }
 181
 182 void iwl_leds_init(struct iwl_priv *priv)
 183 {
 184         int mode = led_mode;
 185         int ret;
 186
 187         if (mode == IWL_LED_DEFAULT)
 188                 mode = priv->cfg->led_mode;
 189
 190         priv->led.name = kasprintf(GFP_KERNEL, "%s-led",
 191                                    wiphy_name(priv->hw->wiphy));
 192         priv->led.brightness_set = iwl_led_brightness_set;
 193         priv->led.blink_set = iwl_led_blink_set;
 194         priv->led.max_brightness = 1;
 195
 196         switch (mode) {
 197         case IWL_LED_DEFAULT:
 198                 WARN_ON(1);
 199                 break;
 200         case IWL_LED_BLINK:
 201                 priv->led.default_trigger =
 202                         ieee80211_create_tpt_led_trigger(priv->hw,
 203                                         IEEE80211_TPT_LEDTRIG_FL_CONNECTED,
 204                                         iwl_blink, ARRAY_SIZE(iwl_blink));
 205                 break;
 206         case IWL_LED_RF_STATE:
 207                 priv->led.default_trigger =
 208                         ieee80211_get_radio_led_name(priv->hw);
 209                 break;
 210         }
 211
 212         ret = led_classdev_register(&priv->pci_dev->dev, &priv->led);
 213         if (ret) {
 214                 kfree(priv->led.name);
 215                 return;
 216         }
 217
 218         priv->led_registered = true;
 219 }
 220
 221 void iwl_leds_exit(struct iwl_priv *priv)
 222 {
 223         if (!priv->led_registered)
 224                 return;
 225
 226         led_classdev_unregister(&priv->led);
 227         kfree(priv->led.name);
 228 }