wl1251: add powersave exit logic for transfers
[pandora-kernel.git] / drivers / net / wireless / wl1251 / sdio.c
1 /*
2  * wl12xx SDIO routines
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License version 2 as
6  * published by the Free Software Foundation.
7  *
8  * This program is distributed in the hope that it will be useful, but
9  * WITHOUT ANY WARRANTY; without even the implied warranty of
10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
11  * General Public License for more details.
12  *
13  * You should have received a copy of the GNU General Public License
14  * along with this program; if not, write to the Free Software
15  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
16  * 02110-1301 USA
17  *
18  * Copyright (C) 2005 Texas Instruments Incorporated
19  * Copyright (C) 2008 Google Inc
20  * Copyright (C) 2009 Bob Copeland (me@bobcopeland.com)
21  */
22 #include <linux/interrupt.h>
23 #include <linux/module.h>
24 #include <linux/mod_devicetable.h>
25 #include <linux/mmc/sdio_func.h>
26 #include <linux/mmc/sdio_ids.h>
27 #include <linux/platform_device.h>
28 #include <linux/wl12xx.h>
29 #include <linux/irq.h>
30 #include <linux/pm_runtime.h>
31
32 #include "wl1251.h"
33
34 static bool force_nvs_file = false;
35 module_param(force_nvs_file, bool, 0644);
36 MODULE_PARM_DESC(force_nvs_file, "Force loading NVS data from file, "
37                                  "not EEPROM. Default: n/N/0");
38 static bool dump_eeprom = false;
39 module_param(dump_eeprom, bool, 0644);
40 MODULE_PARM_DESC(dump_eeprom, "Dump EEPROM on module load and makes it "
41                               "accessable through debugfs. Default: n/N/0");
42
43 #ifndef SDIO_VENDOR_ID_TI
44 #define SDIO_VENDOR_ID_TI               0x104c
45 #endif
46
47 #ifndef SDIO_DEVICE_ID_TI_WL1251
48 #define SDIO_DEVICE_ID_TI_WL1251        0x9066
49 #endif
50
51 struct wl1251_sdio {
52         struct sdio_func *func;
53         u32 elp_val;
54 };
55
56 static struct sdio_func *wl_to_func(struct wl1251 *wl)
57 {
58         struct wl1251_sdio *wl_sdio = wl->if_priv;
59         return wl_sdio->func;
60 }
61
62 static void wl1251_sdio_interrupt(struct sdio_func *func)
63 {
64         struct wl1251 *wl = sdio_get_drvdata(func);
65
66         wl1251_debug(DEBUG_IRQ, "IRQ");
67
68         /* FIXME should be synchronous for sdio */
69         ieee80211_queue_work(wl->hw, &wl->irq_work);
70 }
71
72 static const struct sdio_device_id wl1251_devices[] = {
73         { SDIO_DEVICE(SDIO_VENDOR_ID_TI, SDIO_DEVICE_ID_TI_WL1251) },
74         {}
75 };
76 MODULE_DEVICE_TABLE(sdio, wl1251_devices);
77
78
79 static void wl1251_sdio_read(struct wl1251 *wl, int addr,
80                              void *buf, size_t len)
81 {
82         int ret;
83         struct sdio_func *func = wl_to_func(wl);
84
85         sdio_claim_host(func);
86         ret = sdio_memcpy_fromio(func, buf, addr, len);
87         if (ret)
88                 wl1251_error("sdio read failed (%d)", ret);
89         sdio_release_host(func);
90 }
91
92 static void wl1251_sdio_write(struct wl1251 *wl, int addr,
93                               void *buf, size_t len)
94 {
95         int ret;
96         struct sdio_func *func = wl_to_func(wl);
97
98         sdio_claim_host(func);
99         ret = sdio_memcpy_toio(func, addr, buf, len);
100         if (ret)
101                 wl1251_error("sdio write failed (%d)", ret);
102         sdio_release_host(func);
103 }
104
105 static void wl1251_sdio_read_elp(struct wl1251 *wl, int addr, u32 *val)
106 {
107         int ret = 0;
108         struct wl1251_sdio *wl_sdio = wl->if_priv;
109         struct sdio_func *func = wl_sdio->func;
110
111         /*
112          * The hardware only supports RAW (read after write) access for
113          * reading, regular sdio_readb won't work here (it interprets
114          * the unused bits of CMD52 as write data even if we send read
115          * request).
116          */
117         sdio_claim_host(func);
118         *val = sdio_writeb_readb(func, wl_sdio->elp_val, addr, &ret);
119         sdio_release_host(func);
120
121         if (ret)
122                 wl1251_error("sdio_readb failed (%d)", ret);
123 }
124
125 static void wl1251_sdio_write_elp(struct wl1251 *wl, int addr, u32 val)
126 {
127         int ret = 0;
128         struct wl1251_sdio *wl_sdio = wl->if_priv;
129         struct sdio_func *func = wl_sdio->func;
130
131         sdio_claim_host(func);
132         sdio_writeb(func, val, addr, &ret);
133         sdio_release_host(func);
134
135         if (ret)
136                 wl1251_error("sdio_writeb failed (%d)", ret);
137         else
138                 wl_sdio->elp_val = val;
139 }
140
141 static void wl1251_sdio_reset(struct wl1251 *wl)
142 {
143 }
144
145 static void wl1251_sdio_enable_irq(struct wl1251 *wl)
146 {
147         struct sdio_func *func = wl_to_func(wl);
148
149         sdio_claim_host(func);
150         sdio_claim_irq(func, wl1251_sdio_interrupt);
151         sdio_release_host(func);
152 }
153
154 static void wl1251_sdio_disable_irq(struct wl1251 *wl)
155 {
156         struct sdio_func *func = wl_to_func(wl);
157
158         sdio_claim_host(func);
159         sdio_release_irq(func);
160         sdio_release_host(func);
161 }
162
163 static void wl1251_enable_line_irq(struct wl1251 *wl)
164 {
165         return enable_irq(wl->irq);
166 }
167
168 static void wl1251_disable_line_irq(struct wl1251 *wl)
169 {
170         return disable_irq(wl->irq);
171 }
172
173 static int wl1251_sdio_set_power(struct wl1251 *wl, bool enable)
174 {
175         struct sdio_func *func = wl_to_func(wl);
176         int ret;
177
178         if (enable) {
179                 /*
180                  * Power is controlled by runtime PM, but we still call board
181                  * callback in case it wants to do any additional setup,
182                  * for example enabling clock buffer for the module.
183                  */
184                 if (wl->set_power)
185                         wl->set_power(true);
186
187                 ret = pm_runtime_get_sync(&func->dev);
188                 if (ret < 0)
189                         goto out;
190
191                 sdio_claim_host(func);
192                 sdio_enable_func(func);
193                 sdio_release_host(func);
194         } else {
195                 sdio_claim_host(func);
196                 sdio_disable_func(func);
197                 sdio_release_host(func);
198
199                 ret = pm_runtime_put_sync(&func->dev);
200                 if (ret < 0)
201                         goto out;
202
203                 if (wl->set_power)
204                         wl->set_power(false);
205         }
206
207 out:
208         return ret;
209 }
210
211 static struct wl1251_if_operations wl1251_sdio_ops = {
212         .read = wl1251_sdio_read,
213         .write = wl1251_sdio_write,
214         .write_elp = wl1251_sdio_write_elp,
215         .read_elp = wl1251_sdio_read_elp,
216         .reset = wl1251_sdio_reset,
217         .power = wl1251_sdio_set_power,
218 };
219
220 static ssize_t
221 wl1251_show_long_doze(struct device *dev, struct device_attribute *attr,
222         char *buf)
223 {
224         struct wl1251 *wl = dev_get_drvdata(dev);
225         return sprintf(buf, "%d\n", wl->long_doze_mode);
226 }
227
228 static ssize_t
229 wl1251_set_long_doze(struct device *dev, struct device_attribute *attr,
230         const char *buf, size_t count)
231 {
232         struct wl1251 *wl = dev_get_drvdata(dev);
233         int val, ret;
234
235         ret = kstrtoint(buf, 10, &val);
236         if (ret < 0)
237                 return ret;
238
239         wl->long_doze_mode = !!val;
240         return count;
241 }
242
243 static ssize_t
244 wl1251_show_ps_rate_thr(struct device *dev, struct device_attribute *attr,
245         char *buf)
246 {
247         struct wl1251 *wl = dev_get_drvdata(dev);
248         return sprintf(buf, "%u\n", wl->ps_rate_threshold);
249 }
250
251 static ssize_t
252 wl1251_set_ps_rate_thr(struct device *dev, struct device_attribute *attr,
253         const char *buf, size_t count)
254 {
255         struct wl1251 *wl = dev_get_drvdata(dev);
256         unsigned int val;
257         int ret;
258
259         ret = kstrtouint(buf, 10, &val);
260         if (ret < 0)
261                 return ret;
262
263         wl->ps_rate_threshold = val;
264         return count;
265 }
266
267 static struct device_attribute wl1251_attrs[] = {
268         __ATTR(long_doze_mode, S_IRUGO | S_IWUGO,
269                 wl1251_show_long_doze, wl1251_set_long_doze),
270         __ATTR(ps_rate_threshold, S_IRUGO | S_IWUGO,
271                 wl1251_show_ps_rate_thr, wl1251_set_ps_rate_thr),
272 };
273
274 static int wl1251_sdio_probe(struct sdio_func *func,
275                              const struct sdio_device_id *id)
276 {
277         int ret, t;
278         struct wl1251 *wl;
279         struct ieee80211_hw *hw;
280         struct wl1251_sdio *wl_sdio;
281         const struct wl12xx_platform_data *wl12xx_board_data;
282
283         hw = wl1251_alloc_hw();
284         if (IS_ERR(hw))
285                 return PTR_ERR(hw);
286
287         wl = hw->priv;
288
289         wl_sdio = kzalloc(sizeof(*wl_sdio), GFP_KERNEL);
290         if (wl_sdio == NULL) {
291                 ret = -ENOMEM;
292                 goto out_free_hw;
293         }
294
295         sdio_claim_host(func);
296         ret = sdio_enable_func(func);
297         if (ret)
298                 goto release;
299
300         sdio_set_block_size(func, 512);
301         sdio_release_host(func);
302
303         SET_IEEE80211_DEV(hw, &func->dev);
304         wl_sdio->func = func;
305         wl->if_priv = wl_sdio;
306         wl->if_ops = &wl1251_sdio_ops;
307
308         wl12xx_board_data = wl12xx_get_platform_data();
309         if (!IS_ERR(wl12xx_board_data)) {
310                 wl->set_power = wl12xx_board_data->set_power;
311                 wl->irq = wl12xx_board_data->irq;
312                 wl->use_eeprom = wl12xx_board_data->use_eeprom;
313         }
314
315         if (force_nvs_file)
316                 wl->use_eeprom = false;
317         wl->dump_eeprom = dump_eeprom;
318
319         if (wl->irq) {
320                 irq_set_status_flags(wl->irq, IRQ_NOAUTOEN);
321
322                 ret = request_threaded_irq(wl->irq, NULL, wl1251_irq,
323                         IRQF_ONESHOT, "wl1251", wl);
324                 if (ret < 0) {
325                         wl1251_error("request_irq() failed: %d", ret);
326                         goto disable;
327                 }
328
329                 irq_set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING);
330
331                 wl1251_sdio_ops.enable_irq = wl1251_enable_line_irq;
332                 wl1251_sdio_ops.disable_irq = wl1251_disable_line_irq;
333
334                 wl1251_info("using dedicated interrupt line");
335         } else {
336                 wl1251_sdio_ops.enable_irq = wl1251_sdio_enable_irq;
337                 wl1251_sdio_ops.disable_irq = wl1251_sdio_disable_irq;
338
339                 wl1251_info("using SDIO interrupt");
340         }
341
342         ret = wl1251_init_ieee80211(wl);
343         if (ret)
344                 goto out_free_irq;
345
346         sdio_set_drvdata(func, wl);
347
348         for (t = 0; t < ARRAY_SIZE(wl1251_attrs); t++) {
349                 ret = device_create_file(&func->dev, &wl1251_attrs[t]);
350                 if (ret) {
351                         while (--t >= 0)
352                                 device_remove_file(&func->dev,
353                                                    &wl1251_attrs[t]);
354                         goto out_free_irq;
355                 }
356         }
357
358         /* Tell PM core that we don't need the card to be powered now */
359         pm_runtime_put_noidle(&func->dev);
360
361         return ret;
362
363 out_free_irq:
364         if (wl->irq)
365                 free_irq(wl->irq, wl);
366 disable:
367         sdio_claim_host(func);
368         sdio_disable_func(func);
369 release:
370         sdio_release_host(func);
371         kfree(wl_sdio);
372 out_free_hw:
373         wl1251_free_hw(wl);
374         return ret;
375 }
376
377 static void __devexit wl1251_sdio_remove(struct sdio_func *func)
378 {
379         struct wl1251 *wl = sdio_get_drvdata(func);
380         struct wl1251_sdio *wl_sdio = wl->if_priv;
381         int t;
382
383         /* Undo decrement done above in wl1251_probe */
384         pm_runtime_get_noresume(&func->dev);
385
386         for (t = 0; t < ARRAY_SIZE(wl1251_attrs); t++)
387                 device_remove_file(&func->dev, &wl1251_attrs[t]);
388
389         if (wl->irq)
390                 free_irq(wl->irq, wl);
391         wl1251_free_hw(wl);
392         kfree(wl_sdio);
393
394         sdio_claim_host(func);
395         sdio_release_irq(func);
396         sdio_disable_func(func);
397         sdio_release_host(func);
398 }
399
400 static int wl1251_suspend(struct device *dev)
401 {
402         /*
403          * Tell MMC/SDIO core it's OK to power down the card
404          * (if it isn't already), but not to remove it completely.
405          */
406         return 0;
407 }
408
409 static int wl1251_resume(struct device *dev)
410 {
411         return 0;
412 }
413
414 static const struct dev_pm_ops wl1251_sdio_pm_ops = {
415         .suspend        = wl1251_suspend,
416         .resume         = wl1251_resume,
417 };
418
419 static struct sdio_driver wl1251_sdio_driver = {
420         .name           = "wl1251_sdio",
421         .id_table       = wl1251_devices,
422         .probe          = wl1251_sdio_probe,
423         .remove         = __devexit_p(wl1251_sdio_remove),
424         .drv.pm         = &wl1251_sdio_pm_ops,
425 };
426
427 static int __init wl1251_sdio_init(void)
428 {
429         int err;
430
431         err = sdio_register_driver(&wl1251_sdio_driver);
432         if (err)
433                 wl1251_error("failed to register sdio driver: %d", err);
434         return err;
435 }
436
437 static void __exit wl1251_sdio_exit(void)
438 {
439         sdio_unregister_driver(&wl1251_sdio_driver);
440         wl1251_notice("unloaded");
441 }
442
443 module_init(wl1251_sdio_init);
444 module_exit(wl1251_sdio_exit);
445
446 MODULE_LICENSE("GPL");
447 MODULE_AUTHOR("Kalle Valo <kvalo@adurom.com>");