Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[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 #define IWL_1MB_RATE (128 * 1024)
46 #define IWL_LED_THRESHOLD (16)
47 #define IWL_MAX_BLINK_TBL (10)
48
49 static const struct {
50         u16 brightness;
51         u8 on_time;
52         u8 of_time;
53 } blink_tbl[] =
54 {
55         {300, 25, 25},
56         {200, 40, 40},
57         {100, 55, 55},
58         {70, 65, 65},
59         {50, 75, 75},
60         {20, 85, 85},
61         {15, 95, 95 },
62         {10, 110, 110},
63         {5, 130, 130},
64         {0, 167, 167}
65 };
66
67 static int iwl3945_led_cmd_callback(struct iwl3945_priv *priv,
68                                     struct iwl3945_cmd *cmd,
69                                     struct sk_buff *skb)
70 {
71         return 1;
72 }
73
74
75 /* Send led command */
76 static int iwl_send_led_cmd(struct iwl3945_priv *priv,
77                             struct iwl3945_led_cmd *led_cmd)
78 {
79         struct iwl3945_host_cmd cmd = {
80                 .id = REPLY_LEDS_CMD,
81                 .len = sizeof(struct iwl3945_led_cmd),
82                 .data = led_cmd,
83                 .meta.flags = CMD_ASYNC,
84                 .meta.u.callback = iwl3945_led_cmd_callback
85         };
86
87         return iwl3945_send_cmd(priv, &cmd);
88 }
89
90
91 /* Set led on command */
92 static int iwl3945_led_on(struct iwl3945_priv *priv, int led_id)
93 {
94         struct iwl3945_led_cmd led_cmd = {
95                 .id = led_id,
96                 .on = IWL_LED_SOLID,
97                 .off = 0,
98                 .interval = IWL_DEF_LED_INTRVL
99         };
100         return iwl_send_led_cmd(priv, &led_cmd);
101 }
102
103 /* Set led on command */
104 static int iwl3945_led_pattern(struct iwl3945_priv *priv, int led_id,
105                                enum led_brightness brightness)
106 {
107         struct iwl3945_led_cmd led_cmd = {
108                 .id = led_id,
109                 .on = brightness,
110                 .off = brightness,
111                 .interval = IWL_DEF_LED_INTRVL
112         };
113         if (brightness == LED_FULL) {
114                 led_cmd.on = IWL_LED_SOLID;
115                 led_cmd.off = 0;
116         }
117         return iwl_send_led_cmd(priv, &led_cmd);
118 }
119
120 /* Set led register off */
121 static int iwl3945_led_on_reg(struct iwl3945_priv *priv, int led_id)
122 {
123         IWL_DEBUG_LED("led on %d\n", led_id);
124         return iwl3945_led_on(priv, led_id);
125 }
126
127 /* Set led off command */
128 static int iwl3945_led_off(struct iwl3945_priv *priv, int led_id)
129 {
130         struct iwl3945_led_cmd led_cmd = {
131                 .id = led_id,
132                 .on = 0,
133                 .off = 0,
134                 .interval = IWL_DEF_LED_INTRVL
135         };
136         IWL_DEBUG_LED("led off %d\n", led_id);
137         return iwl_send_led_cmd(priv, &led_cmd);
138 }
139
140 /* Set led register off */
141 static int iwl3945_led_off_reg(struct iwl3945_priv *priv, int led_id)
142 {
143         iwl3945_led_off(priv, led_id);
144         return 0;
145 }
146
147 /* Set led blink command */
148 static int iwl3945_led_not_solid(struct iwl3945_priv *priv, int led_id,
149                                u8 brightness)
150 {
151         struct iwl3945_led_cmd led_cmd = {
152                 .id = led_id,
153                 .on = brightness,
154                 .off = brightness,
155                 .interval = IWL_DEF_LED_INTRVL
156         };
157
158         return iwl_send_led_cmd(priv, &led_cmd);
159 }
160
161
162 /*
163  * brightness call back function for Tx/Rx LED
164  */
165 static int iwl3945_led_associated(struct iwl3945_priv *priv, int led_id)
166 {
167         if (test_bit(STATUS_EXIT_PENDING, &priv->status) ||
168             !test_bit(STATUS_READY, &priv->status))
169                 return 0;
170
171
172         /* start counting Tx/Rx bytes */
173         if (!priv->last_blink_time && priv->allow_blinking)
174                 priv->last_blink_time = jiffies;
175         return 0;
176 }
177
178 /*
179  * brightness call back for association and radio
180  */
181 static void iwl3945_led_brightness_set(struct led_classdev *led_cdev,
182                                 enum led_brightness brightness)
183 {
184         struct iwl3945_led *led = container_of(led_cdev,
185                                                struct iwl3945_led, led_dev);
186         struct iwl3945_priv *priv = led->priv;
187
188         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
189                 return;
190
191         switch (brightness) {
192         case LED_FULL:
193                 if (led->type == IWL_LED_TRG_ASSOC) {
194                         priv->allow_blinking = 1;
195                         IWL_DEBUG_LED("MAC is  associated\n");
196                 }
197                 if (led->led_on)
198                         led->led_on(priv, IWL_LED_LINK);
199                 break;
200         case LED_OFF:
201                 if (led->type == IWL_LED_TRG_ASSOC) {
202                         priv->allow_blinking = 0;
203                         IWL_DEBUG_LED("MAC is disassociated\n");
204                 }
205                 if (led->led_off)
206                         led->led_off(priv, IWL_LED_LINK);
207                 break;
208         default:
209                 if (led->led_pattern)
210                         led->led_pattern(priv, IWL_LED_LINK, brightness);
211                 break;
212         }
213 }
214
215
216
217 /*
218  * Register led class with the system
219  */
220 static int iwl3945_led_register_led(struct iwl3945_priv *priv,
221                                    struct iwl3945_led *led,
222                                    enum led_type type, u8 set_led,
223                                    const char *name, char *trigger)
224 {
225         struct device *device = wiphy_dev(priv->hw->wiphy);
226         int ret;
227
228         led->led_dev.name = name;
229         led->led_dev.brightness_set = iwl3945_led_brightness_set;
230         led->led_dev.default_trigger = trigger;
231
232         led->priv = priv;
233         led->type = type;
234
235         ret = led_classdev_register(device, &led->led_dev);
236         if (ret) {
237                 IWL_ERROR("Error: failed to register led handler.\n");
238                 return ret;
239         }
240
241         led->registered = 1;
242
243         if (set_led && led->led_on)
244                 led->led_on(priv, IWL_LED_LINK);
245         return 0;
246 }
247
248
249 /*
250  * calculate blink rate according to last 2 sec Tx/Rx activities
251  */
252 static inline u8 get_blink_rate(struct iwl3945_priv *priv)
253 {
254         int index;
255         u8 blink_rate;
256
257         if (priv->rxtxpackets < IWL_LED_THRESHOLD)
258                 index = 10;
259         else {
260                 for (index = 0; index < IWL_MAX_BLINK_TBL; index++) {
261                         if (priv->rxtxpackets > (blink_tbl[index].brightness *
262                                                  IWL_1MB_RATE))
263                                 break;
264                 }
265         }
266         /* if 0 frame is transfered */
267         if ((index == IWL_MAX_BLINK_TBL) || !priv->allow_blinking)
268                 blink_rate = IWL_LED_SOLID;
269         else
270                 blink_rate = blink_tbl[index].on_time;
271
272         return blink_rate;
273 }
274
275 static inline int is_rf_kill(struct iwl3945_priv *priv)
276 {
277         return test_bit(STATUS_RF_KILL_HW, &priv->status) ||
278                 test_bit(STATUS_RF_KILL_SW, &priv->status);
279 }
280
281 /*
282  * this function called from handler. Since setting Led command can
283  * happen very frequent we postpone led command to be called from
284  * REPLY handler so we know ucode is up
285  */
286 void iwl3945_led_background(struct iwl3945_priv *priv)
287 {
288         u8 blink_rate;
289
290         if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
291                 priv->last_blink_time = 0;
292                 return;
293         }
294         if (is_rf_kill(priv)) {
295                 priv->last_blink_time = 0;
296                 return;
297         }
298
299         if (!priv->allow_blinking) {
300                 priv->last_blink_time = 0;
301                 if (priv->last_blink_rate != IWL_LED_SOLID) {
302                         priv->last_blink_rate = IWL_LED_SOLID;
303                         iwl3945_led_on(priv, IWL_LED_LINK);
304                 }
305                 return;
306         }
307         if (!priv->last_blink_time ||
308             !time_after(jiffies, priv->last_blink_time +
309                         msecs_to_jiffies(1000)))
310                 return;
311
312         blink_rate = get_blink_rate(priv);
313
314         /* call only if blink rate change */
315         if (blink_rate != priv->last_blink_rate) {
316                 if (blink_rate != IWL_LED_SOLID) {
317                         priv->last_blink_time = jiffies +
318                                                 msecs_to_jiffies(1000);
319                         iwl3945_led_not_solid(priv, IWL_LED_LINK, blink_rate);
320                 } else {
321                         priv->last_blink_time = 0;
322                         iwl3945_led_on(priv, IWL_LED_LINK);
323                 }
324         }
325
326         priv->last_blink_rate = blink_rate;
327         priv->rxtxpackets = 0;
328 }
329
330
331 /* Register all led handler */
332 int iwl3945_led_register(struct iwl3945_priv *priv)
333 {
334         char *trigger;
335         char name[32];
336         int ret;
337
338         priv->last_blink_rate = 0;
339         priv->rxtxpackets = 0;
340         priv->last_blink_time = 0;
341         priv->allow_blinking = 0;
342
343         trigger = ieee80211_get_radio_led_name(priv->hw);
344         snprintf(name, sizeof(name), "iwl-%s:radio",
345                  wiphy_name(priv->hw->wiphy));
346
347         priv->led[IWL_LED_TRG_RADIO].led_on = iwl3945_led_on_reg;
348         priv->led[IWL_LED_TRG_RADIO].led_off = iwl3945_led_off_reg;
349         priv->led[IWL_LED_TRG_RADIO].led_pattern = NULL;
350
351         ret = iwl3945_led_register_led(priv,
352                                    &priv->led[IWL_LED_TRG_RADIO],
353                                    IWL_LED_TRG_RADIO, 1,
354                                    name, trigger);
355         if (ret)
356                 goto exit_fail;
357
358         trigger = ieee80211_get_assoc_led_name(priv->hw);
359         snprintf(name, sizeof(name), "iwl-%s:assoc",
360                  wiphy_name(priv->hw->wiphy));
361
362         ret = iwl3945_led_register_led(priv,
363                                    &priv->led[IWL_LED_TRG_ASSOC],
364                                    IWL_LED_TRG_ASSOC, 0,
365                                    name, trigger);
366         /* for assoc always turn led on */
367         priv->led[IWL_LED_TRG_ASSOC].led_on = iwl3945_led_on_reg;
368         priv->led[IWL_LED_TRG_ASSOC].led_off = iwl3945_led_on_reg;
369         priv->led[IWL_LED_TRG_ASSOC].led_pattern = NULL;
370
371         if (ret)
372                 goto exit_fail;
373
374         trigger = ieee80211_get_rx_led_name(priv->hw);
375         snprintf(name, sizeof(name), "iwl-%s:RX",
376                  wiphy_name(priv->hw->wiphy));
377
378
379         ret = iwl3945_led_register_led(priv,
380                                    &priv->led[IWL_LED_TRG_RX],
381                                    IWL_LED_TRG_RX, 0,
382                                    name, trigger);
383
384         priv->led[IWL_LED_TRG_RX].led_on = iwl3945_led_associated;
385         priv->led[IWL_LED_TRG_RX].led_off = iwl3945_led_associated;
386         priv->led[IWL_LED_TRG_RX].led_pattern = iwl3945_led_pattern;
387
388         if (ret)
389                 goto exit_fail;
390
391         trigger = ieee80211_get_tx_led_name(priv->hw);
392         snprintf(name, sizeof(name), "iwl-%s:TX",
393                  wiphy_name(priv->hw->wiphy));
394         ret = iwl3945_led_register_led(priv,
395                                    &priv->led[IWL_LED_TRG_TX],
396                                    IWL_LED_TRG_TX, 0,
397                                    name, trigger);
398         priv->led[IWL_LED_TRG_TX].led_on = iwl3945_led_associated;
399         priv->led[IWL_LED_TRG_TX].led_off = iwl3945_led_associated;
400         priv->led[IWL_LED_TRG_TX].led_pattern = iwl3945_led_pattern;
401
402         if (ret)
403                 goto exit_fail;
404
405         return 0;
406
407 exit_fail:
408         iwl3945_led_unregister(priv);
409         return ret;
410 }
411
412
413 /* unregister led class */
414 static void iwl3945_led_unregister_led(struct iwl3945_led *led, u8 set_led)
415 {
416         if (!led->registered)
417                 return;
418
419         led_classdev_unregister(&led->led_dev);
420
421         if (set_led)
422                 led->led_dev.brightness_set(&led->led_dev, LED_OFF);
423         led->registered = 0;
424 }
425
426 /* Unregister all led handlers */
427 void iwl3945_led_unregister(struct iwl3945_priv *priv)
428 {
429         iwl3945_led_unregister_led(&priv->led[IWL_LED_TRG_ASSOC], 0);
430         iwl3945_led_unregister_led(&priv->led[IWL_LED_TRG_RX], 0);
431         iwl3945_led_unregister_led(&priv->led[IWL_LED_TRG_TX], 0);
432         iwl3945_led_unregister_led(&priv->led[IWL_LED_TRG_RADIO], 1);
433 }
434