iwlwifi/dvm/led.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /******************************************************************************
0003  *
0004  * Copyright(c) 2003 - 2014 Intel Corporation. All rights reserved.
0005  * Copyright (C) 2019 Intel Corporation
0006  *****************************************************************************/
0007
0008
0009 #include <linux/kernel.h>
0010 #include <linux/module.h>
0011 #include <linux/delay.h>
0012 #include <linux/skbuff.h>
0013 #include <linux/netdevice.h>
0014 #include <net/mac80211.h>
0015 #include <linux/etherdevice.h>
0016 #include <asm/unaligned.h>
0017 #include "iwl-io.h"
0018 #include "iwl-trans.h"
0019 #include "iwl-modparams.h"
0020 #include "dev.h"
0021 #include "agn.h"
0022
0023 /* Throughput       OFF time(ms)    ON time (ms)
0024  *  >300            25      25
0025  *  >200 to 300     40      40
0026  *  >100 to 200     55      55
0027  *  >70 to 100      65      65
0028  *  >50 to 70       75      75
0029  *  >20 to 50       85      85
0030  *  >10 to 20       95      95
0031  *  >5 to 10        110     110
0032  *  >1 to 5         130     130
0033  *  >0 to 1         167     167
0034  *  <=0                 SOLID ON
0035  */
0036 static const struct ieee80211_tpt_blink iwl_blink[] = {
0037     { .throughput = 0, .blink_time = 334 },
0038     { .throughput = 1 * 1024 - 1, .blink_time = 260 },
0039     { .throughput = 5 * 1024 - 1, .blink_time = 220 },
0040     { .throughput = 10 * 1024 - 1, .blink_time = 190 },
0041     { .throughput = 20 * 1024 - 1, .blink_time = 170 },
0042     { .throughput = 50 * 1024 - 1, .blink_time = 150 },
0043     { .throughput = 70 * 1024 - 1, .blink_time = 130 },
0044     { .throughput = 100 * 1024 - 1, .blink_time = 110 },
0045     { .throughput = 200 * 1024 - 1, .blink_time = 80 },
0046     { .throughput = 300 * 1024 - 1, .blink_time = 50 },
0047 };
0048
0049 /* Set led register off */
0050 void iwlagn_led_enable(struct iwl_priv *priv)
0051 {
0052     iwl_write32(priv->trans, CSR_LED_REG, CSR_LED_REG_TURN_ON);
0053 }
0054
0055 /*
0056  * Adjust led blink rate to compensate on a MAC Clock difference on every HW
0057  * Led blink rate analysis showed an average deviation of 20% on 5000 series
0058  * and up.
0059  * Need to compensate on the led on/off time per HW according to the deviation
0060  * to achieve the desired led frequency
0061  * The calculation is: (100-averageDeviation)/100 * blinkTime
0062  * For code efficiency the calculation will be:
0063  *     compensation = (100 - averageDeviation) * 64 / 100
0064  *     NewBlinkTime = (compensation * BlinkTime) / 64
0065  */
0066 static inline u8 iwl_blink_compensation(struct iwl_priv *priv,
0067                     u8 time, u16 compensation)
0068 {
0069     if (!compensation) {
0070         IWL_ERR(priv, "undefined blink compensation: "
0071             "use pre-defined blinking time\n");
0072         return time;
0073     }
0074
0075     return (u8)((time * compensation) >> 6);
0076 }
0077
0078 static int iwl_send_led_cmd(struct iwl_priv *priv, struct iwl_led_cmd *led_cmd)
0079 {
0080     struct iwl_host_cmd cmd = {
0081         .id = REPLY_LEDS_CMD,
0082         .len = { sizeof(struct iwl_led_cmd), },
0083         .data = { led_cmd, },
0084         .flags = CMD_ASYNC,
0085     };
0086     u32 reg;
0087
0088     reg = iwl_read32(priv->trans, CSR_LED_REG);
0089     if (reg != (reg & CSR_LED_BSM_CTRL_MSK))
0090         iwl_write32(priv->trans, CSR_LED_REG,
0091                 reg & CSR_LED_BSM_CTRL_MSK);
0092
0093     return iwl_dvm_send_cmd(priv, &cmd);
0094 }
0095
0096 /* Set led pattern command */
0097 static int iwl_led_cmd(struct iwl_priv *priv,
0098                unsigned long on,
0099                unsigned long off)
0100 {
0101     struct iwl_led_cmd led_cmd = {
0102         .id = IWL_LED_LINK,
0103         .interval = IWL_DEF_LED_INTRVL
0104     };
0105     int ret;
0106
0107     if (!test_bit(STATUS_READY, &priv->status))
0108         return -EBUSY;
0109
0110     if (priv->blink_on == on && priv->blink_off == off)
0111         return 0;
0112
0113     if (off == 0) {
0114         /* led is SOLID_ON */
0115         on = IWL_LED_SOLID;
0116     }
0117
0118     led_cmd.on = iwl_blink_compensation(priv, on,
0119                 priv->trans->trans_cfg->base_params->led_compensation);
0120     led_cmd.off = iwl_blink_compensation(priv, off,
0121                 priv->trans->trans_cfg->base_params->led_compensation);
0122
0123     ret = iwl_send_led_cmd(priv, &led_cmd);
0124     if (!ret) {
0125         priv->blink_on = on;
0126         priv->blink_off = off;
0127     }
0128     return ret;
0129 }
0130
0131 static void iwl_led_brightness_set(struct led_classdev *led_cdev,
0132                    enum led_brightness brightness)
0133 {
0134     struct iwl_priv *priv = container_of(led_cdev, struct iwl_priv, led);
0135     unsigned long on = 0;
0136     unsigned long off = 0;
0137
0138     if (brightness > 0)
0139         on = IWL_LED_SOLID;
0140     else
0141         off = IWL_LED_SOLID;
0142
0143     iwl_led_cmd(priv, on, off);
0144 }
0145
0146 static int iwl_led_blink_set(struct led_classdev *led_cdev,
0147                  unsigned long *delay_on,
0148                  unsigned long *delay_off)
0149 {
0150     struct iwl_priv *priv = container_of(led_cdev, struct iwl_priv, led);
0151
0152     return iwl_led_cmd(priv, *delay_on, *delay_off);
0153 }
0154
0155 void iwl_leds_init(struct iwl_priv *priv)
0156 {
0157     int mode = iwlwifi_mod_params.led_mode;
0158     int ret;
0159
0160     if (mode == IWL_LED_DISABLE) {
0161         IWL_INFO(priv, "Led disabled\n");
0162         return;
0163     }
0164     if (mode == IWL_LED_DEFAULT)
0165         mode = priv->cfg->led_mode;
0166
0167     priv->led.name = kasprintf(GFP_KERNEL, "%s-led",
0168                    wiphy_name(priv->hw->wiphy));
0169     if (!priv->led.name)
0170         return;
0171
0172     priv->led.brightness_set = iwl_led_brightness_set;
0173     priv->led.blink_set = iwl_led_blink_set;
0174     priv->led.max_brightness = 1;
0175
0176     switch (mode) {
0177     case IWL_LED_DEFAULT:
0178         WARN_ON(1);
0179         break;
0180     case IWL_LED_BLINK:
0181         priv->led.default_trigger =
0182             ieee80211_create_tpt_led_trigger(priv->hw,
0183                     IEEE80211_TPT_LEDTRIG_FL_CONNECTED,
0184                     iwl_blink, ARRAY_SIZE(iwl_blink));
0185         break;
0186     case IWL_LED_RF_STATE:
0187         priv->led.default_trigger =
0188             ieee80211_get_radio_led_name(priv->hw);
0189         break;
0190     }
0191
0192     ret = led_classdev_register(priv->trans->dev, &priv->led);
0193     if (ret) {
0194         kfree(priv->led.name);
0195         return;
0196     }
0197
0198     priv->led_registered = true;
0199 }
0200
0201 void iwl_leds_exit(struct iwl_priv *priv)
0202 {
0203     if (!priv->led_registered)
0204         return;
0205
0206     led_classdev_unregister(&priv->led);
0207     kfree(priv->led.name);
0208 }