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