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 <asm/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 }
209