kernel/drivers/net/wireless/iwlwifi/dvm/led.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2003 - 2014 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/delay.h>
  31 #include <linux/skbuff.h>
  32 #include <linux/netdevice.h>
  33 #include <net/mac80211.h>
  34 #include <linux/etherdevice.h>
  35 #include <asm/unaligned.h>
  36 #include "iwl-io.h"
  37 #include "iwl-trans.h"
  38 #include "iwl-modparams.h"
  39 #include "dev.h"
  40 #include "agn.h"
  41
  42 /* Throughput           OFF time(ms)    ON time (ms)
  43  *      >300                    25              25
  44  *      >200 to 300             40              40
  45  *      >100 to 200             55              55
  46  *      >70 to 100              65              65
  47  *      >50 to 70               75              75
  48  *      >20 to 50               85              85
  49  *      >10 to 20               95              95
  50  *      >5 to 10                110             110
  51  *      >1 to 5                 130             130
  52  *      >0 to 1                 167             167
  53  *      <=0                                     SOLID ON
  54  */
  55 static const struct ieee80211_tpt_blink iwl_blink[] = {
  56         { .throughput = 0, .blink_time = 334 },
  57         { .throughput = 1 * 1024 - 1, .blink_time = 260 },
  58         { .throughput = 5 * 1024 - 1, .blink_time = 220 },
  59         { .throughput = 10 * 1024 - 1, .blink_time = 190 },
  60         { .throughput = 20 * 1024 - 1, .blink_time = 170 },
  61         { .throughput = 50 * 1024 - 1, .blink_time = 150 },
  62         { .throughput = 70 * 1024 - 1, .blink_time = 130 },
  63         { .throughput = 100 * 1024 - 1, .blink_time = 110 },
  64         { .throughput = 200 * 1024 - 1, .blink_time = 80 },
  65         { .throughput = 300 * 1024 - 1, .blink_time = 50 },
  66 };
  67
  68 /* Set led register off */
  69 void iwlagn_led_enable(struct iwl_priv *priv)
  70 {
  71         iwl_write32(priv->trans, CSR_LED_REG, CSR_LED_REG_TURN_ON);
  72 }
  73
  74 /*
  75  * Adjust led blink rate to compensate on a MAC Clock difference on every HW
  76  * Led blink rate analysis showed an average deviation of 20% on 5000 series
  77  * and up.
  78  * Need to compensate on the led on/off time per HW according to the deviation
  79  * to achieve the desired led frequency
  80  * The calculation is: (100-averageDeviation)/100 * blinkTime
  81  * For code efficiency the calculation will be:
  82  *     compensation = (100 - averageDeviation) * 64 / 100
  83  *     NewBlinkTime = (compensation * BlinkTime) / 64
  84  */
  85 static inline u8 iwl_blink_compensation(struct iwl_priv *priv,
  86                                     u8 time, u16 compensation)
  87 {
  88         if (!compensation) {
  89                 IWL_ERR(priv, "undefined blink compensation: "
  90                         "use pre-defined blinking time\n");
  91                 return time;
  92         }
  93
  94         return (u8)((time * compensation) >> 6);
  95 }
  96
  97 static int iwl_send_led_cmd(struct iwl_priv *priv, struct iwl_led_cmd *led_cmd)
  98 {
  99         struct iwl_host_cmd cmd = {
 100                 .id = REPLY_LEDS_CMD,
 101                 .len = { sizeof(struct iwl_led_cmd), },
 102                 .data = { led_cmd, },
 103                 .flags = CMD_ASYNC,
 104         };
 105         u32 reg;
 106
 107         reg = iwl_read32(priv->trans, CSR_LED_REG);
 108         if (reg != (reg & CSR_LED_BSM_CTRL_MSK))
 109                 iwl_write32(priv->trans, CSR_LED_REG,
 110                             reg & CSR_LED_BSM_CTRL_MSK);
 111
 112         return iwl_dvm_send_cmd(priv, &cmd);
 113 }
 114
 115 /* Set led pattern command */
 116 static int iwl_led_cmd(struct iwl_priv *priv,
 117                        unsigned long on,
 118                        unsigned long off)
 119 {
 120         struct iwl_led_cmd led_cmd = {
 121                 .id = IWL_LED_LINK,
 122                 .interval = IWL_DEF_LED_INTRVL
 123         };
 124         int ret;
 125
 126         if (!test_bit(STATUS_READY, &priv->status))
 127                 return -EBUSY;
 128
 129         if (priv->blink_on == on && priv->blink_off == off)
 130                 return 0;
 131
 132         if (off == 0) {
 133                 /* led is SOLID_ON */
 134                 on = IWL_LED_SOLID;
 135         }
 136
 137         IWL_DEBUG_LED(priv, "Led blink time compensation=%u\n",
 138                         priv->cfg->base_params->led_compensation);
 139         led_cmd.on = iwl_blink_compensation(priv, on,
 140                                 priv->cfg->base_params->led_compensation);
 141         led_cmd.off = iwl_blink_compensation(priv, off,
 142                                 priv->cfg->base_params->led_compensation);
 143
 144         ret = iwl_send_led_cmd(priv, &led_cmd);
 145         if (!ret) {
 146                 priv->blink_on = on;
 147                 priv->blink_off = off;
 148         }
 149         return ret;
 150 }
 151
 152 static void iwl_led_brightness_set(struct led_classdev *led_cdev,
 153                                    enum led_brightness brightness)
 154 {
 155         struct iwl_priv *priv = container_of(led_cdev, struct iwl_priv, led);
 156         unsigned long on = 0;
 157
 158         if (brightness > 0)
 159                 on = IWL_LED_SOLID;
 160
 161         iwl_led_cmd(priv, on, 0);
 162 }
 163
 164 static int iwl_led_blink_set(struct led_classdev *led_cdev,
 165                              unsigned long *delay_on,
 166                              unsigned long *delay_off)
 167 {
 168         struct iwl_priv *priv = container_of(led_cdev, struct iwl_priv, led);
 169
 170         return iwl_led_cmd(priv, *delay_on, *delay_off);
 171 }
 172
 173 void iwl_leds_init(struct iwl_priv *priv)
 174 {
 175         int mode = iwlwifi_mod_params.led_mode;
 176         int ret;
 177
 178         if (mode == IWL_LED_DISABLE) {
 179                 IWL_INFO(priv, "Led disabled\n");
 180                 return;
 181         }
 182         if (mode == IWL_LED_DEFAULT)
 183                 mode = priv->cfg->led_mode;
 184
 185         priv->led.name = kasprintf(GFP_KERNEL, "%s-led",
 186                                    wiphy_name(priv->hw->wiphy));
 187         priv->led.brightness_set = iwl_led_brightness_set;
 188         priv->led.blink_set = iwl_led_blink_set;
 189         priv->led.max_brightness = 1;
 190
 191         switch (mode) {
 192         case IWL_LED_DEFAULT:
 193                 WARN_ON(1);
 194                 break;
 195         case IWL_LED_BLINK:
 196                 priv->led.default_trigger =
 197                         ieee80211_create_tpt_led_trigger(priv->hw,
 198                                         IEEE80211_TPT_LEDTRIG_FL_CONNECTED,
 199                                         iwl_blink, ARRAY_SIZE(iwl_blink));
 200                 break;
 201         case IWL_LED_RF_STATE:
 202                 priv->led.default_trigger =
 203                         ieee80211_get_radio_led_name(priv->hw);
 204                 break;
 205         }
 206
 207         ret = led_classdev_register(priv->trans->dev, &priv->led);
 208         if (ret) {
 209                 kfree(priv->led.name);
 210                 return;
 211         }
 212
 213         priv->led_registered = true;
 214 }
 215
 216 void iwl_leds_exit(struct iwl_priv *priv)
 217 {
 218         if (!priv->led_registered)
 219                 return;
 220
 221         led_classdev_unregister(&priv->led);
 222         kfree(priv->led.name);
 223 }