Merge branch 'devel'
[linux-2.6] / drivers / net / wireless / iwlwifi / iwl-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  *  Intel Linux Wireless <ilw@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/init.h>
31 #include <linux/pci.h>
32 #include <linux/dma-mapping.h>
33 #include <linux/delay.h>
34 #include <linux/skbuff.h>
35 #include <linux/netdevice.h>
36 #include <linux/wireless.h>
37 #include <net/mac80211.h>
38 #include <linux/etherdevice.h>
39 #include <asm/unaligned.h>
40
41 #include "iwl-dev.h"
42 #include "iwl-core.h"
43 #include "iwl-io.h"
44
45 #ifdef CONFIG_IWLWIFI_DEBUG
46 static const char *led_type_str[] = {
47         __stringify(IWL_LED_TRG_TX),
48         __stringify(IWL_LED_TRG_RX),
49         __stringify(IWL_LED_TRG_ASSOC),
50         __stringify(IWL_LED_TRG_RADIO),
51         NULL
52 };
53 #endif /* CONFIG_IWLWIFI_DEBUG */
54
55
56 static const struct {
57         u16 tpt;
58         u8 on_time;
59         u8 off_time;
60 } blink_tbl[] =
61 {
62         {300, 25, 25},
63         {200, 40, 40},
64         {100, 55, 55},
65         {70, 65, 65},
66         {50, 75, 75},
67         {20, 85, 85},
68         {15, 95, 95 },
69         {10, 110, 110},
70         {5, 130, 130},
71         {0, 167, 167},
72 /* SOLID_ON */
73         {-1, IWL_LED_SOLID, 0}
74 };
75
76 #define IWL_1MB_RATE (128 * 1024)
77 #define IWL_LED_THRESHOLD (16)
78 #define IWL_MAX_BLINK_TBL (ARRAY_SIZE(blink_tbl) - 1) /* exclude SOLID_ON */
79 #define IWL_SOLID_BLINK_IDX (ARRAY_SIZE(blink_tbl) - 1)
80
81 /*  [0-256] -> [0..8] FIXME: we need [0..10] */
82 static inline int iwl_brightness_to_idx(enum led_brightness brightness)
83 {
84         return fls(0x000000FF & (u32)brightness);
85 }
86
87 /* Send led command */
88 static int iwl_send_led_cmd(struct iwl_priv *priv, struct iwl_led_cmd *led_cmd)
89 {
90         struct iwl_host_cmd cmd = {
91                 .id = REPLY_LEDS_CMD,
92                 .len = sizeof(struct iwl_led_cmd),
93                 .data = led_cmd,
94                 .meta.flags = CMD_ASYNC,
95                 .meta.u.callback = NULL,
96         };
97         u32 reg;
98
99         reg = iwl_read32(priv, CSR_LED_REG);
100         if (reg != (reg & CSR_LED_BSM_CTRL_MSK))
101                 iwl_write32(priv, CSR_LED_REG, reg & CSR_LED_BSM_CTRL_MSK);
102
103         return iwl_send_cmd(priv, &cmd);
104 }
105
106 /* Set led pattern command */
107 static int iwl4965_led_pattern(struct iwl_priv *priv, int led_id,
108                                unsigned int idx)
109 {
110         struct iwl_led_cmd led_cmd = {
111                 .id = led_id,
112                 .interval = IWL_DEF_LED_INTRVL
113         };
114
115         BUG_ON(idx > IWL_MAX_BLINK_TBL);
116
117         led_cmd.on = blink_tbl[idx].on_time;
118         led_cmd.off = blink_tbl[idx].off_time;
119
120         return iwl_send_led_cmd(priv, &led_cmd);
121 }
122
123 /* Set led register off */
124 static int iwl4965_led_on_reg(struct iwl_priv *priv, int led_id)
125 {
126         IWL_DEBUG_LED("led on %d\n", led_id);
127         iwl_write32(priv, CSR_LED_REG, CSR_LED_REG_TRUN_ON);
128         return 0;
129 }
130
131 #if 0
132 /* Set led on command */
133 static int iwl4965_led_on(struct iwl_priv *priv, int led_id)
134 {
135         struct iwl_led_cmd led_cmd = {
136                 .id = led_id,
137                 .on = IWL_LED_SOLID,
138                 .off = 0,
139                 .interval = IWL_DEF_LED_INTRVL
140         };
141         return iwl_send_led_cmd(priv, &led_cmd);
142 }
143
144 /* Set led off command */
145 int iwl4965_led_off(struct iwl_priv *priv, int led_id)
146 {
147         struct iwl_led_cmd led_cmd = {
148                 .id = led_id,
149                 .on = 0,
150                 .off = 0,
151                 .interval = IWL_DEF_LED_INTRVL
152         };
153         IWL_DEBUG_LED("led off %d\n", led_id);
154         return iwl_send_led_cmd(priv, &led_cmd);
155 }
156 #endif
157
158
159 /* Set led register off */
160 static int iwl4965_led_off_reg(struct iwl_priv *priv, int led_id)
161 {
162         IWL_DEBUG_LED("LED Reg off\n");
163         iwl_write32(priv, CSR_LED_REG, CSR_LED_REG_TRUN_OFF);
164         return 0;
165 }
166
167 /*
168  * Set led register in case of disassociation according to rfkill state
169  */
170 static int iwl_led_associate(struct iwl_priv *priv, int led_id)
171 {
172         IWL_DEBUG_LED("Associated\n");
173         priv->allow_blinking = 1;
174         return iwl4965_led_on_reg(priv, led_id);
175 }
176 static int iwl_led_disassociate(struct iwl_priv *priv, int led_id)
177 {
178         priv->allow_blinking = 0;
179         if (iwl_is_rfkill(priv))
180                 iwl4965_led_off_reg(priv, led_id);
181         else
182                 iwl4965_led_on_reg(priv, led_id);
183
184         return 0;
185 }
186
187 /*
188  * brightness call back function for Tx/Rx LED
189  */
190 static int iwl_led_associated(struct iwl_priv *priv, int led_id)
191 {
192         if (test_bit(STATUS_EXIT_PENDING, &priv->status) ||
193             !test_bit(STATUS_READY, &priv->status))
194                 return 0;
195
196
197         /* start counting Tx/Rx bytes */
198         if (!priv->last_blink_time && priv->allow_blinking)
199                 priv->last_blink_time = jiffies;
200         return 0;
201 }
202
203 /*
204  * brightness call back for association and radio
205  */
206 static void iwl_led_brightness_set(struct led_classdev *led_cdev,
207                                        enum led_brightness brightness)
208 {
209         struct iwl_led *led = container_of(led_cdev, struct iwl_led, led_dev);
210         struct iwl_priv *priv = led->priv;
211
212         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
213                 return;
214
215
216         IWL_DEBUG_LED("Led type = %s brightness = %d\n",
217                         led_type_str[led->type], brightness);
218         switch (brightness) {
219         case LED_FULL:
220                 if (led->led_on)
221                         led->led_on(priv, IWL_LED_LINK);
222                 break;
223         case LED_OFF:
224                 if (led->led_off)
225                         led->led_off(priv, IWL_LED_LINK);
226                 break;
227         default:
228                 if (led->led_pattern) {
229                         int idx = iwl_brightness_to_idx(brightness);
230                         led->led_pattern(priv, IWL_LED_LINK, idx);
231                 }
232                 break;
233         }
234 }
235
236
237
238 /*
239  * Register led class with the system
240  */
241 static int iwl_leds_register_led(struct iwl_priv *priv, struct iwl_led *led,
242                                    enum led_type type, u8 set_led,
243                                    char *trigger)
244 {
245         struct device *device = wiphy_dev(priv->hw->wiphy);
246         int ret;
247
248         led->led_dev.name = led->name;
249         led->led_dev.brightness_set = iwl_led_brightness_set;
250         led->led_dev.default_trigger = trigger;
251
252         led->priv = priv;
253         led->type = type;
254
255         ret = led_classdev_register(device, &led->led_dev);
256         if (ret) {
257                 IWL_ERROR("Error: failed to register led handler.\n");
258                 return ret;
259         }
260
261         led->registered = 1;
262
263         if (set_led && led->led_on)
264                 led->led_on(priv, IWL_LED_LINK);
265
266         return 0;
267 }
268
269
270 /*
271  * calculate blink rate according to last 2 sec Tx/Rx activities
272  */
273 static int iwl_get_blink_rate(struct iwl_priv *priv)
274 {
275         int i;
276         u64 current_tpt = priv->tx_stats[2].bytes;
277         /* FIXME: + priv->rx_stats[2].bytes; */
278         s64 tpt = current_tpt - priv->led_tpt;
279
280         if (tpt < 0) /* wraparound */
281                 tpt = -tpt;
282
283         IWL_DEBUG_LED("tpt %lld current_tpt %llu\n",
284                 (long long)tpt,
285                 (unsigned long long)current_tpt);
286         priv->led_tpt = current_tpt;
287
288         if (!priv->allow_blinking)
289                 i = IWL_MAX_BLINK_TBL;
290         else
291                 for (i = 0; i < IWL_MAX_BLINK_TBL; i++)
292                         if (tpt  > (blink_tbl[i].tpt * IWL_1MB_RATE))
293                                 break;
294
295         IWL_DEBUG_LED("LED BLINK IDX=%d\n", i);
296         return i;
297 }
298
299 /*
300  * this function called from handler. Since setting Led command can
301  * happen very frequent we postpone led command to be called from
302  * REPLY handler so we know ucode is up
303  */
304 void iwl_leds_background(struct iwl_priv *priv)
305 {
306         u8 blink_idx;
307
308         if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
309                 priv->last_blink_time = 0;
310                 return;
311         }
312         if (iwl_is_rfkill(priv)) {
313                 priv->last_blink_time = 0;
314                 return;
315         }
316
317         if (!priv->allow_blinking) {
318                 priv->last_blink_time = 0;
319                 if (priv->last_blink_rate != IWL_SOLID_BLINK_IDX) {
320                         priv->last_blink_rate = IWL_SOLID_BLINK_IDX;
321                         iwl4965_led_pattern(priv, IWL_LED_LINK,
322                                             IWL_SOLID_BLINK_IDX);
323                 }
324                 return;
325         }
326         if (!priv->last_blink_time ||
327             !time_after(jiffies, priv->last_blink_time +
328                         msecs_to_jiffies(1000)))
329                 return;
330
331         blink_idx = iwl_get_blink_rate(priv);
332
333         /* call only if blink rate change */
334         if (blink_idx != priv->last_blink_rate)
335                 iwl4965_led_pattern(priv, IWL_LED_LINK, blink_idx);
336
337         priv->last_blink_time = jiffies;
338         priv->last_blink_rate = blink_idx;
339 }
340 EXPORT_SYMBOL(iwl_leds_background);
341
342 /* Register all led handler */
343 int iwl_leds_register(struct iwl_priv *priv)
344 {
345         char *trigger;
346         int ret;
347
348         priv->last_blink_rate = 0;
349         priv->led_tpt = 0;
350         priv->last_blink_time = 0;
351         priv->allow_blinking = 0;
352
353         trigger = ieee80211_get_radio_led_name(priv->hw);
354         snprintf(priv->led[IWL_LED_TRG_RADIO].name,
355                  sizeof(priv->led[IWL_LED_TRG_RADIO].name), "iwl-%s:radio",
356                  wiphy_name(priv->hw->wiphy));
357
358         priv->led[IWL_LED_TRG_RADIO].led_on = iwl4965_led_on_reg;
359         priv->led[IWL_LED_TRG_RADIO].led_off = iwl4965_led_off_reg;
360         priv->led[IWL_LED_TRG_RADIO].led_pattern = NULL;
361
362         ret = iwl_leds_register_led(priv, &priv->led[IWL_LED_TRG_RADIO],
363                                    IWL_LED_TRG_RADIO, 1, trigger);
364         if (ret)
365                 goto exit_fail;
366
367         trigger = ieee80211_get_assoc_led_name(priv->hw);
368         snprintf(priv->led[IWL_LED_TRG_ASSOC].name,
369                  sizeof(priv->led[IWL_LED_TRG_ASSOC].name), "iwl-%s:assoc",
370                  wiphy_name(priv->hw->wiphy));
371
372         ret = iwl_leds_register_led(priv, &priv->led[IWL_LED_TRG_ASSOC],
373                                    IWL_LED_TRG_ASSOC, 0, trigger);
374
375         /* for assoc always turn led on */
376         priv->led[IWL_LED_TRG_ASSOC].led_on = iwl_led_associate;
377         priv->led[IWL_LED_TRG_ASSOC].led_off = iwl_led_disassociate;
378         priv->led[IWL_LED_TRG_ASSOC].led_pattern = NULL;
379
380         if (ret)
381                 goto exit_fail;
382
383         trigger = ieee80211_get_rx_led_name(priv->hw);
384         snprintf(priv->led[IWL_LED_TRG_RX].name,
385                  sizeof(priv->led[IWL_LED_TRG_RX].name), "iwl-%s:RX",
386                  wiphy_name(priv->hw->wiphy));
387
388         ret = iwl_leds_register_led(priv, &priv->led[IWL_LED_TRG_RX],
389                                    IWL_LED_TRG_RX, 0, trigger);
390
391         priv->led[IWL_LED_TRG_RX].led_on = iwl_led_associated;
392         priv->led[IWL_LED_TRG_RX].led_off = iwl_led_associated;
393         priv->led[IWL_LED_TRG_RX].led_pattern = iwl4965_led_pattern;
394
395         if (ret)
396                 goto exit_fail;
397
398         trigger = ieee80211_get_tx_led_name(priv->hw);
399         snprintf(priv->led[IWL_LED_TRG_TX].name,
400                  sizeof(priv->led[IWL_LED_TRG_TX].name), "iwl-%s:TX",
401                  wiphy_name(priv->hw->wiphy));
402
403         ret = iwl_leds_register_led(priv, &priv->led[IWL_LED_TRG_TX],
404                                    IWL_LED_TRG_TX, 0, trigger);
405
406         priv->led[IWL_LED_TRG_TX].led_on = iwl_led_associated;
407         priv->led[IWL_LED_TRG_TX].led_off = iwl_led_associated;
408         priv->led[IWL_LED_TRG_TX].led_pattern = iwl4965_led_pattern;
409
410         if (ret)
411                 goto exit_fail;
412
413         return 0;
414
415 exit_fail:
416         iwl_leds_unregister(priv);
417         return ret;
418 }
419 EXPORT_SYMBOL(iwl_leds_register);
420
421 /* unregister led class */
422 static void iwl_leds_unregister_led(struct iwl_led *led, u8 set_led)
423 {
424         if (!led->registered)
425                 return;
426
427         led_classdev_unregister(&led->led_dev);
428
429         if (set_led)
430                 led->led_dev.brightness_set(&led->led_dev, LED_OFF);
431         led->registered = 0;
432 }
433
434 /* Unregister all led handlers */
435 void iwl_leds_unregister(struct iwl_priv *priv)
436 {
437         iwl_leds_unregister_led(&priv->led[IWL_LED_TRG_ASSOC], 0);
438         iwl_leds_unregister_led(&priv->led[IWL_LED_TRG_RX], 0);
439         iwl_leds_unregister_led(&priv->led[IWL_LED_TRG_TX], 0);
440         iwl_leds_unregister_led(&priv->led[IWL_LED_TRG_RADIO], 1);
441 }
442 EXPORT_SYMBOL(iwl_leds_unregister);
443