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 <linuxwifi@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 	led_cmd.on = iwl_blink_compensation(priv, on,
138 				priv->cfg->base_params->led_compensation);
139 	led_cmd.off = iwl_blink_compensation(priv, off,
140 				priv->cfg->base_params->led_compensation);
141 
142 	ret = iwl_send_led_cmd(priv, &led_cmd);
143 	if (!ret) {
144 		priv->blink_on = on;
145 		priv->blink_off = off;
146 	}
147 	return ret;
148 }
149 
150 static void iwl_led_brightness_set(struct led_classdev *led_cdev,
151 				   enum led_brightness brightness)
152 {
153 	struct iwl_priv *priv = container_of(led_cdev, struct iwl_priv, led);
154 	unsigned long on = 0;
155 	unsigned long off = 0;
156 
157 	if (brightness > 0)
158 		on = IWL_LED_SOLID;
159 	else
160 		off = IWL_LED_SOLID;
161 
162 	iwl_led_cmd(priv, on, off);
163 }
164 
165 static int iwl_led_blink_set(struct led_classdev *led_cdev,
166 			     unsigned long *delay_on,
167 			     unsigned long *delay_off)
168 {
169 	struct iwl_priv *priv = container_of(led_cdev, struct iwl_priv, led);
170 
171 	return iwl_led_cmd(priv, *delay_on, *delay_off);
172 }
173 
174 void iwl_leds_init(struct iwl_priv *priv)
175 {
176 	int mode = iwlwifi_mod_params.led_mode;
177 	int ret;
178 
179 	if (mode == IWL_LED_DISABLE) {
180 		IWL_INFO(priv, "Led disabled\n");
181 		return;
182 	}
183 	if (mode == IWL_LED_DEFAULT)
184 		mode = priv->cfg->led_mode;
185 
186 	priv->led.name = kasprintf(GFP_KERNEL, "%s-led",
187 				   wiphy_name(priv->hw->wiphy));
188 	priv->led.brightness_set = iwl_led_brightness_set;
189 	priv->led.blink_set = iwl_led_blink_set;
190 	priv->led.max_brightness = 1;
191 
192 	switch (mode) {
193 	case IWL_LED_DEFAULT:
194 		WARN_ON(1);
195 		break;
196 	case IWL_LED_BLINK:
197 		priv->led.default_trigger =
198 			ieee80211_create_tpt_led_trigger(priv->hw,
199 					IEEE80211_TPT_LEDTRIG_FL_CONNECTED,
200 					iwl_blink, ARRAY_SIZE(iwl_blink));
201 		break;
202 	case IWL_LED_RF_STATE:
203 		priv->led.default_trigger =
204 			ieee80211_get_radio_led_name(priv->hw);
205 		break;
206 	}
207 
208 	ret = led_classdev_register(priv->trans->dev, &priv->led);
209 	if (ret) {
210 		kfree(priv->led.name);
211 		return;
212 	}
213 
214 	priv->led_registered = true;
215 }
216 
217 void iwl_leds_exit(struct iwl_priv *priv)
218 {
219 	if (!priv->led_registered)
220 		return;
221 
222 	led_classdev_unregister(&priv->led);
223 	kfree(priv->led.name);
224 }
225