Merge branch 'for-linus' of git://neil.brown.name/md
[linux-2.6] / drivers / net / wireless / iwlwifi / iwl-3945-led.c
1 /******************************************************************************
2  *
3  * Copyright(c) 2003 - 2008 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  * James P. Ketrenos <ipw2100-admin@linux.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/version.h>
31 #include <linux/init.h>
32 #include <linux/pci.h>
33 #include <linux/dma-mapping.h>
34 #include <linux/delay.h>
35 #include <linux/skbuff.h>
36 #include <linux/netdevice.h>
37 #include <linux/wireless.h>
38 #include <net/mac80211.h>
39 #include <linux/etherdevice.h>
40 #include <asm/unaligned.h>
41
42 #include "iwl-3945.h"
43 #include "iwl-helpers.h"
44
45
46 static const struct {
47         u16 brightness;
48         u8 on_time;
49         u8 off_time;
50 } blink_tbl[] =
51 {
52         {300, 25, 25},
53         {200, 40, 40},
54         {100, 55, 55},
55         {70, 65, 65},
56         {50, 75, 75},
57         {20, 85, 85},
58         {15, 95, 95 },
59         {10, 110, 110},
60         {5, 130, 130},
61         {0, 167, 167},
62         /*SOLID_ON*/
63         {-1, IWL_LED_SOLID, 0}
64 };
65
66 #define IWL_1MB_RATE (128 * 1024)
67 #define IWL_LED_THRESHOLD (16)
68 #define IWL_MAX_BLINK_TBL (ARRAY_SIZE(blink_tbl) - 1) /*Exclude Solid on*/
69 #define IWL_SOLID_BLINK_IDX (ARRAY_SIZE(blink_tbl) - 1)
70
71 static int iwl3945_led_cmd_callback(struct iwl3945_priv *priv,
72                                     struct iwl3945_cmd *cmd,
73                                     struct sk_buff *skb)
74 {
75         return 1;
76 }
77
78 static inline int iwl3945_brightness_to_idx(enum led_brightness brightness)
79 {
80         return fls(0x000000FF & (u32)brightness);
81 }
82
83 /* Send led command */
84 static int iwl_send_led_cmd(struct iwl3945_priv *priv,
85                             struct iwl3945_led_cmd *led_cmd)
86 {
87         struct iwl3945_host_cmd cmd = {
88                 .id = REPLY_LEDS_CMD,
89                 .len = sizeof(struct iwl3945_led_cmd),
90                 .data = led_cmd,
91                 .meta.flags = CMD_ASYNC,
92                 .meta.u.callback = iwl3945_led_cmd_callback,
93         };
94
95         return iwl3945_send_cmd(priv, &cmd);
96 }
97
98
99
100 /* Set led on command */
101 static int iwl3945_led_pattern(struct iwl3945_priv *priv, int led_id,
102                                unsigned int idx)
103 {
104         struct iwl3945_led_cmd led_cmd = {
105                 .id = led_id,
106                 .interval = IWL_DEF_LED_INTRVL
107         };
108
109         BUG_ON(idx > IWL_MAX_BLINK_TBL);
110
111         led_cmd.on = blink_tbl[idx].on_time;
112         led_cmd.off = blink_tbl[idx].off_time;
113
114         return iwl_send_led_cmd(priv, &led_cmd);
115 }
116
117
118 #if 1
119 /* Set led on command */
120 static int iwl3945_led_on(struct iwl3945_priv *priv, int led_id)
121 {
122         struct iwl3945_led_cmd led_cmd = {
123                 .id = led_id,
124                 .on = IWL_LED_SOLID,
125                 .off = 0,
126                 .interval = IWL_DEF_LED_INTRVL
127         };
128         return iwl_send_led_cmd(priv, &led_cmd);
129 }
130
131 /* Set led off command */
132 static int iwl3945_led_off(struct iwl3945_priv *priv, int led_id)
133 {
134         struct iwl3945_led_cmd led_cmd = {
135                 .id = led_id,
136                 .on = 0,
137                 .off = 0,
138                 .interval = IWL_DEF_LED_INTRVL
139         };
140         IWL_DEBUG_LED("led off %d\n", led_id);
141         return iwl_send_led_cmd(priv, &led_cmd);
142 }
143 #endif
144
145
146 /*
147  * brightness call back function for Tx/Rx LED
148  */
149 static int iwl3945_led_associated(struct iwl3945_priv *priv, int led_id)
150 {
151         if (test_bit(STATUS_EXIT_PENDING, &priv->status) ||
152             !test_bit(STATUS_READY, &priv->status))
153                 return 0;
154
155
156         /* start counting Tx/Rx bytes */
157         if (!priv->last_blink_time && priv->allow_blinking)
158                 priv->last_blink_time = jiffies;
159         return 0;
160 }
161
162 /*
163  * brightness call back for association and radio
164  */
165 static void iwl3945_led_brightness_set(struct led_classdev *led_cdev,
166                                 enum led_brightness brightness)
167 {
168         struct iwl3945_led *led = container_of(led_cdev,
169                                                struct iwl3945_led, led_dev);
170         struct iwl3945_priv *priv = led->priv;
171
172         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
173                 return;
174
175         switch (brightness) {
176         case LED_FULL:
177                 if (led->type == IWL_LED_TRG_ASSOC) {
178                         priv->allow_blinking = 1;
179                         IWL_DEBUG_LED("MAC is  associated\n");
180                 }
181                 if (led->led_on)
182                         led->led_on(priv, IWL_LED_LINK);
183                 break;
184         case LED_OFF:
185                 if (led->type == IWL_LED_TRG_ASSOC) {
186                         priv->allow_blinking = 0;
187                         IWL_DEBUG_LED("MAC is disassociated\n");
188                 }
189                 if (led->led_off)
190                         led->led_off(priv, IWL_LED_LINK);
191                 break;
192         default:
193                 if (led->led_pattern) {
194                         int idx = iwl3945_brightness_to_idx(brightness);
195                         led->led_pattern(priv, IWL_LED_LINK, idx);
196                 }
197                 break;
198         }
199 }
200
201
202
203 /*
204  * Register led class with the system
205  */
206 static int iwl3945_led_register_led(struct iwl3945_priv *priv,
207                                    struct iwl3945_led *led,
208                                    enum led_type type, u8 set_led,
209                                    const char *name, char *trigger)
210 {
211         struct device *device = wiphy_dev(priv->hw->wiphy);
212         int ret;
213
214         led->led_dev.name = name;
215         led->led_dev.brightness_set = iwl3945_led_brightness_set;
216         led->led_dev.default_trigger = trigger;
217
218         led->priv = priv;
219         led->type = type;
220
221         ret = led_classdev_register(device, &led->led_dev);
222         if (ret) {
223                 IWL_ERROR("Error: failed to register led handler.\n");
224                 return ret;
225         }
226
227         led->registered = 1;
228
229         if (set_led && led->led_on)
230                 led->led_on(priv, IWL_LED_LINK);
231         return 0;
232 }
233
234
235 /*
236  * calculate blink rate according to last 2 sec Tx/Rx activities
237  */
238 static inline u8 get_blink_rate(struct iwl3945_priv *priv)
239 {
240         int index;
241         u64 current_tpt = priv->rxtxpackets;
242         s64 tpt = current_tpt - priv->led_tpt;
243
244         if (tpt < 0)
245                 tpt = -tpt;
246         priv->led_tpt = current_tpt;
247
248         if (!priv->allow_blinking)
249                 index = IWL_MAX_BLINK_TBL;
250         else
251                 for (index = 0; index < IWL_MAX_BLINK_TBL; index++)
252                         if (tpt > (blink_tbl[index].brightness * IWL_1MB_RATE))
253                                 break;
254         return index;
255 }
256
257 static inline int is_rf_kill(struct iwl3945_priv *priv)
258 {
259         return test_bit(STATUS_RF_KILL_HW, &priv->status) ||
260                 test_bit(STATUS_RF_KILL_SW, &priv->status);
261 }
262
263 /*
264  * this function called from handler. Since setting Led command can
265  * happen very frequent we postpone led command to be called from
266  * REPLY handler so we know ucode is up
267  */
268 void iwl3945_led_background(struct iwl3945_priv *priv)
269 {
270         u8 blink_idx;
271
272         if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
273                 priv->last_blink_time = 0;
274                 return;
275         }
276         if (is_rf_kill(priv)) {
277                 priv->last_blink_time = 0;
278                 return;
279         }
280
281         if (!priv->allow_blinking) {
282                 priv->last_blink_time = 0;
283                 if (priv->last_blink_rate != IWL_SOLID_BLINK_IDX) {
284                         priv->last_blink_rate = IWL_SOLID_BLINK_IDX;
285                         iwl3945_led_pattern(priv, IWL_LED_LINK,
286                                             IWL_SOLID_BLINK_IDX);
287                 }
288                 return;
289         }
290         if (!priv->last_blink_time ||
291             !time_after(jiffies, priv->last_blink_time +
292                         msecs_to_jiffies(1000)))
293                 return;
294
295         blink_idx = get_blink_rate(priv);
296
297         /* call only if blink rate change */
298         if (blink_idx != priv->last_blink_rate)
299                 iwl3945_led_pattern(priv, IWL_LED_LINK, blink_idx);
300
301         priv->last_blink_time = jiffies;
302         priv->last_blink_rate = blink_idx;
303         priv->rxtxpackets = 0;
304 }
305
306
307 /* Register all led handler */
308 int iwl3945_led_register(struct iwl3945_priv *priv)
309 {
310         char *trigger;
311         char name[32];
312         int ret;
313
314         priv->last_blink_rate = 0;
315         priv->rxtxpackets = 0;
316         priv->led_tpt = 0;
317         priv->last_blink_time = 0;
318         priv->allow_blinking = 0;
319
320         trigger = ieee80211_get_radio_led_name(priv->hw);
321         snprintf(name, sizeof(name), "iwl-%s:radio",
322                  wiphy_name(priv->hw->wiphy));
323
324         priv->led[IWL_LED_TRG_RADIO].led_on = iwl3945_led_on;
325         priv->led[IWL_LED_TRG_RADIO].led_off = iwl3945_led_off;
326         priv->led[IWL_LED_TRG_RADIO].led_pattern = NULL;
327
328         ret = iwl3945_led_register_led(priv,
329                                    &priv->led[IWL_LED_TRG_RADIO],
330                                    IWL_LED_TRG_RADIO, 1,
331                                    name, trigger);
332         if (ret)
333                 goto exit_fail;
334
335         trigger = ieee80211_get_assoc_led_name(priv->hw);
336         snprintf(name, sizeof(name), "iwl-%s:assoc",
337                  wiphy_name(priv->hw->wiphy));
338
339         ret = iwl3945_led_register_led(priv,
340                                    &priv->led[IWL_LED_TRG_ASSOC],
341                                    IWL_LED_TRG_ASSOC, 0,
342                                    name, trigger);
343         /* for assoc always turn led on */
344         priv->led[IWL_LED_TRG_ASSOC].led_on = iwl3945_led_on;
345         priv->led[IWL_LED_TRG_ASSOC].led_off = iwl3945_led_on;
346         priv->led[IWL_LED_TRG_ASSOC].led_pattern = NULL;
347
348         if (ret)
349                 goto exit_fail;
350
351         trigger = ieee80211_get_rx_led_name(priv->hw);
352         snprintf(name, sizeof(name), "iwl-%s:RX",
353                  wiphy_name(priv->hw->wiphy));
354
355
356         ret = iwl3945_led_register_led(priv,
357                                    &priv->led[IWL_LED_TRG_RX],
358                                    IWL_LED_TRG_RX, 0,
359                                    name, trigger);
360
361         priv->led[IWL_LED_TRG_RX].led_on = iwl3945_led_associated;
362         priv->led[IWL_LED_TRG_RX].led_off = iwl3945_led_associated;
363         priv->led[IWL_LED_TRG_RX].led_pattern = iwl3945_led_pattern;
364
365         if (ret)
366                 goto exit_fail;
367
368         trigger = ieee80211_get_tx_led_name(priv->hw);
369         snprintf(name, sizeof(name), "iwl-%s:TX",
370                  wiphy_name(priv->hw->wiphy));
371
372         ret = iwl3945_led_register_led(priv,
373                                    &priv->led[IWL_LED_TRG_TX],
374                                    IWL_LED_TRG_TX, 0,
375                                    name, trigger);
376         priv->led[IWL_LED_TRG_TX].led_on = iwl3945_led_associated;
377         priv->led[IWL_LED_TRG_TX].led_off = iwl3945_led_associated;
378         priv->led[IWL_LED_TRG_TX].led_pattern = iwl3945_led_pattern;
379
380         if (ret)
381                 goto exit_fail;
382
383         return 0;
384
385 exit_fail:
386         iwl3945_led_unregister(priv);
387         return ret;
388 }
389
390
391 /* unregister led class */
392 static void iwl3945_led_unregister_led(struct iwl3945_led *led, u8 set_led)
393 {
394         if (!led->registered)
395                 return;
396
397         led_classdev_unregister(&led->led_dev);
398
399         if (set_led)
400                 led->led_dev.brightness_set(&led->led_dev, LED_OFF);
401         led->registered = 0;
402 }
403
404 /* Unregister all led handlers */
405 void iwl3945_led_unregister(struct iwl3945_priv *priv)
406 {
407         iwl3945_led_unregister_led(&priv->led[IWL_LED_TRG_ASSOC], 0);
408         iwl3945_led_unregister_led(&priv->led[IWL_LED_TRG_RX], 0);
409         iwl3945_led_unregister_led(&priv->led[IWL_LED_TRG_TX], 0);
410         iwl3945_led_unregister_led(&priv->led[IWL_LED_TRG_RADIO], 1);
411 }
412