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led.c
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1 /******************************************************************************
2  *
3  * Copyright(c) 2003 - 2012 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 <[email protected]>
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/init.h>
31 #include <linux/delay.h>
32 #include <linux/skbuff.h>
33 #include <linux/netdevice.h>
34 #include <net/mac80211.h>
35 #include <linux/etherdevice.h>
36 #include <asm/unaligned.h>
37 #include "iwl-io.h"
38 #include "iwl-trans.h"
39 #include "iwl-modparams.h"
40 #include "dev.h"
41 #include "agn.h"
42 
43 /* Throughput OFF time(ms) ON time (ms)
44  * >300 25 25
45  * >200 to 300 40 40
46  * >100 to 200 55 55
47  * >70 to 100 65 65
48  * >50 to 70 75 75
49  * >20 to 50 85 85
50  * >10 to 20 95 95
51  * >5 to 10 110 110
52  * >1 to 5 130 130
53  * >0 to 1 167 167
54  * <=0 SOLID ON
55  */
56 static const struct ieee80211_tpt_blink iwl_blink[] = {
57  { .throughput = 0, .blink_time = 334 },
58  { .throughput = 1 * 1024 - 1, .blink_time = 260 },
59  { .throughput = 5 * 1024 - 1, .blink_time = 220 },
60  { .throughput = 10 * 1024 - 1, .blink_time = 190 },
61  { .throughput = 20 * 1024 - 1, .blink_time = 170 },
62  { .throughput = 50 * 1024 - 1, .blink_time = 150 },
63  { .throughput = 70 * 1024 - 1, .blink_time = 130 },
64  { .throughput = 100 * 1024 - 1, .blink_time = 110 },
65  { .throughput = 200 * 1024 - 1, .blink_time = 80 },
66  { .throughput = 300 * 1024 - 1, .blink_time = 50 },
67 };
68 
69 /* Set led register off */
70 void iwlagn_led_enable(struct iwl_priv *priv)
71 {
72  iwl_write32(priv->trans, CSR_LED_REG, CSR_LED_REG_TRUN_ON);
73 }
74 
75 /*
76  * Adjust led blink rate to compensate on a MAC Clock difference on every HW
77  * Led blink rate analysis showed an average deviation of 20% on 5000 series
78  * and up.
79  * Need to compensate on the led on/off time per HW according to the deviation
80  * to achieve the desired led frequency
81  * The calculation is: (100-averageDeviation)/100 * blinkTime
82  * For code efficiency the calculation will be:
83  * compensation = (100 - averageDeviation) * 64 / 100
84  * NewBlinkTime = (compensation * BlinkTime) / 64
85  */
86 static inline u8 iwl_blink_compensation(struct iwl_priv *priv,
87  u8 time, u16 compensation)
88 {
89  if (!compensation) {
90  IWL_ERR(priv, "undefined blink compensation: "
91  "use pre-defined blinking time\n");
92  return time;
93  }
94 
95  return (u8)((time * compensation) >> 6);
96 }
97 
98 static int iwl_send_led_cmd(struct iwl_priv *priv, struct iwl_led_cmd *led_cmd)
99 {
100  struct iwl_host_cmd cmd = {
101  .id = REPLY_LEDS_CMD,
102  .len = { sizeof(struct iwl_led_cmd), },
103  .data = { led_cmd, },
104  .flags = CMD_ASYNC,
105  };
106  u32 reg;
107 
108  reg = iwl_read32(priv->trans, CSR_LED_REG);
109  if (reg != (reg & CSR_LED_BSM_CTRL_MSK))
110  iwl_write32(priv->trans, CSR_LED_REG,
111  reg & CSR_LED_BSM_CTRL_MSK);
112 
113  return iwl_dvm_send_cmd(priv, &cmd);
114 }
115 
116 /* Set led pattern command */
117 static int iwl_led_cmd(struct iwl_priv *priv,
118  unsigned long on,
119  unsigned long off)
120 {
121  struct iwl_led_cmd led_cmd = {
122  .id = IWL_LED_LINK,
123  .interval = IWL_DEF_LED_INTRVL
124  };
125  int ret;
126 
127  if (!test_bit(STATUS_READY, &priv->status))
128  return -EBUSY;
129 
130  if (priv->blink_on == on && priv->blink_off == off)
131  return 0;
132 
133  if (off == 0) {
134  /* led is SOLID_ON */
135  on = IWL_LED_SOLID;
136  }
137 
138  IWL_DEBUG_LED(priv, "Led blink time compensation=%u\n",
139  priv->cfg->base_params->led_compensation);
140  led_cmd.on = iwl_blink_compensation(priv, on,
141  priv->cfg->base_params->led_compensation);
142  led_cmd.off = iwl_blink_compensation(priv, off,
143  priv->cfg->base_params->led_compensation);
144 
145  ret = iwl_send_led_cmd(priv, &led_cmd);
146  if (!ret) {
147  priv->blink_on = on;
148  priv->blink_off = off;
149  }
150  return ret;
151 }
152 
153 static void iwl_led_brightness_set(struct led_classdev *led_cdev,
154  enum led_brightness brightness)
155 {
156  struct iwl_priv *priv = container_of(led_cdev, struct iwl_priv, led);
157  unsigned long on = 0;
158 
159  if (brightness > 0)
160  on = IWL_LED_SOLID;
161 
162  iwl_led_cmd(priv, on, 0);
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 }
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