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

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /******************************************************************************
   3  *
   4  * Copyright(c) 2003 - 2014 Intel Corporation. All rights reserved.
   5  * Copyright (C) 2019 Intel Corporation
   6  *
   7  * Contact Information:
   8  *  Intel Linux Wireless <linuxwifi@intel.com>
   9  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  10  *
  11  *****************************************************************************/
  12
  13
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/delay.h>
  17 #include <linux/skbuff.h>
  18 #include <linux/netdevice.h>
  19 #include <net/mac80211.h>
  20 #include <linux/etherdevice.h>
  21 #include <asm/unaligned.h>
  22 #include "iwl-io.h"
  23 #include "iwl-trans.h"
  24 #include "iwl-modparams.h"
  25 #include "dev.h"
  26 #include "agn.h"
  27
  28 /* Throughput           OFF time(ms)    ON time (ms)
  29  *      >300                    25              25
  30  *      >200 to 300             40              40
  31  *      >100 to 200             55              55
  32  *      >70 to 100              65              65
  33  *      >50 to 70               75              75
  34  *      >20 to 50               85              85
  35  *      >10 to 20               95              95
  36  *      >5 to 10                110             110
  37  *      >1 to 5                 130             130
  38  *      >0 to 1                 167             167
  39  *      <=0                                     SOLID ON
  40  */
  41 static const struct ieee80211_tpt_blink iwl_blink[] = {
  42         { .throughput = 0, .blink_time = 334 },
  43         { .throughput = 1 * 1024 - 1, .blink_time = 260 },
  44         { .throughput = 5 * 1024 - 1, .blink_time = 220 },
  45         { .throughput = 10 * 1024 - 1, .blink_time = 190 },
  46         { .throughput = 20 * 1024 - 1, .blink_time = 170 },
  47         { .throughput = 50 * 1024 - 1, .blink_time = 150 },
  48         { .throughput = 70 * 1024 - 1, .blink_time = 130 },
  49         { .throughput = 100 * 1024 - 1, .blink_time = 110 },
  50         { .throughput = 200 * 1024 - 1, .blink_time = 80 },
  51         { .throughput = 300 * 1024 - 1, .blink_time = 50 },
  52 };
  53
  54 /* Set led register off */
  55 void iwlagn_led_enable(struct iwl_priv *priv)
  56 {
  57         iwl_write32(priv->trans, CSR_LED_REG, CSR_LED_REG_TURN_ON);
  58 }
  59
  60 /*
  61  * Adjust led blink rate to compensate on a MAC Clock difference on every HW
  62  * Led blink rate analysis showed an average deviation of 20% on 5000 series
  63  * and up.
  64  * Need to compensate on the led on/off time per HW according to the deviation
  65  * to achieve the desired led frequency
  66  * The calculation is: (100-averageDeviation)/100 * blinkTime
  67  * For code efficiency the calculation will be:
  68  *     compensation = (100 - averageDeviation) * 64 / 100
  69  *     NewBlinkTime = (compensation * BlinkTime) / 64
  70  */
  71 static inline u8 iwl_blink_compensation(struct iwl_priv *priv,
  72                                     u8 time, u16 compensation)
  73 {
  74         if (!compensation) {
  75                 IWL_ERR(priv, "undefined blink compensation: "
  76                         "use pre-defined blinking time\n");
  77                 return time;
  78         }
  79
  80         return (u8)((time * compensation) >> 6);
  81 }
  82
  83 static int iwl_send_led_cmd(struct iwl_priv *priv, struct iwl_led_cmd *led_cmd)
  84 {
  85         struct iwl_host_cmd cmd = {
  86                 .id = REPLY_LEDS_CMD,
  87                 .len = { sizeof(struct iwl_led_cmd), },
  88                 .data = { led_cmd, },
  89                 .flags = CMD_ASYNC,
  90         };
  91         u32 reg;
  92
  93         reg = iwl_read32(priv->trans, CSR_LED_REG);
  94         if (reg != (reg & CSR_LED_BSM_CTRL_MSK))
  95                 iwl_write32(priv->trans, CSR_LED_REG,
  96                             reg & CSR_LED_BSM_CTRL_MSK);
  97
  98         return iwl_dvm_send_cmd(priv, &cmd);
  99 }
 100
 101 /* Set led pattern command */
 102 static int iwl_led_cmd(struct iwl_priv *priv,
 103                        unsigned long on,
 104                        unsigned long off)
 105 {
 106         struct iwl_led_cmd led_cmd = {
 107                 .id = IWL_LED_LINK,
 108                 .interval = IWL_DEF_LED_INTRVL
 109         };
 110         int ret;
 111
 112         if (!test_bit(STATUS_READY, &priv->status))
 113                 return -EBUSY;
 114
 115         if (priv->blink_on == on && priv->blink_off == off)
 116                 return 0;
 117
 118         if (off == 0) {
 119                 /* led is SOLID_ON */
 120                 on = IWL_LED_SOLID;
 121         }
 122
 123         led_cmd.on = iwl_blink_compensation(priv, on,
 124                                 priv->trans->trans_cfg->base_params->led_compensation);
 125         led_cmd.off = iwl_blink_compensation(priv, off,
 126                                 priv->trans->trans_cfg->base_params->led_compensation);
 127
 128         ret = iwl_send_led_cmd(priv, &led_cmd);
 129         if (!ret) {
 130                 priv->blink_on = on;
 131                 priv->blink_off = off;
 132         }
 133         return ret;
 134 }
 135
 136 static void iwl_led_brightness_set(struct led_classdev *led_cdev,
 137                                    enum led_brightness brightness)
 138 {
 139         struct iwl_priv *priv = container_of(led_cdev, struct iwl_priv, led);
 140         unsigned long on = 0;
 141         unsigned long off = 0;
 142
 143         if (brightness > 0)
 144                 on = IWL_LED_SOLID;
 145         else
 146                 off = IWL_LED_SOLID;
 147
 148         iwl_led_cmd(priv, on, off);
 149 }
 150
 151 static int iwl_led_blink_set(struct led_classdev *led_cdev,
 152                              unsigned long *delay_on,
 153                              unsigned long *delay_off)
 154 {
 155         struct iwl_priv *priv = container_of(led_cdev, struct iwl_priv, led);
 156
 157         return iwl_led_cmd(priv, *delay_on, *delay_off);
 158 }
 159
 160 void iwl_leds_init(struct iwl_priv *priv)
 161 {
 162         int mode = iwlwifi_mod_params.led_mode;
 163         int ret;
 164
 165         if (mode == IWL_LED_DISABLE) {
 166                 IWL_INFO(priv, "Led disabled\n");
 167                 return;
 168         }
 169         if (mode == IWL_LED_DEFAULT)
 170                 mode = priv->cfg->led_mode;
 171
 172         priv->led.name = kasprintf(GFP_KERNEL, "%s-led",
 173                                    wiphy_name(priv->hw->wiphy));
 174         priv->led.brightness_set = iwl_led_brightness_set;
 175         priv->led.blink_set = iwl_led_blink_set;
 176         priv->led.max_brightness = 1;
 177
 178         switch (mode) {
 179         case IWL_LED_DEFAULT:
 180                 WARN_ON(1);
 181                 break;
 182         case IWL_LED_BLINK:
 183                 priv->led.default_trigger =
 184                         ieee80211_create_tpt_led_trigger(priv->hw,
 185                                         IEEE80211_TPT_LEDTRIG_FL_CONNECTED,
 186                                         iwl_blink, ARRAY_SIZE(iwl_blink));
 187                 break;
 188         case IWL_LED_RF_STATE:
 189                 priv->led.default_trigger =
 190                         ieee80211_get_radio_led_name(priv->hw);
 191                 break;
 192         }
 193
 194         ret = led_classdev_register(priv->trans->dev, &priv->led);
 195         if (ret) {
 196                 kfree(priv->led.name);
 197                 return;
 198         }
 199
 200         priv->led_registered = true;
 201 }
 202
 203 void iwl_leds_exit(struct iwl_priv *priv)
 204 {
 205         if (!priv->led_registered)
 206                 return;
 207
 208         led_classdev_unregister(&priv->led);
 209         kfree(priv->led.name);
 210 }