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Linux/drivers/mfd/sec-core.c

  1 /*
  2  * sec-core.c
  3  *
  4  * Copyright (c) 2012 Samsung Electronics Co., Ltd
  5  *              http://www.samsung.com
  6  *
  7  *  This program is free software; you can redistribute  it and/or modify it
  8  *  under  the terms of  the GNU General  Public License as published by the
  9  *  Free Software Foundation;  either version 2 of the  License, or (at your
 10  *  option) any later version.
 11  *
 12  */
 13 
 14 #include <linux/module.h>
 15 #include <linux/moduleparam.h>
 16 #include <linux/init.h>
 17 #include <linux/err.h>
 18 #include <linux/slab.h>
 19 #include <linux/i2c.h>
 20 #include <linux/of.h>
 21 #include <linux/of_irq.h>
 22 #include <linux/interrupt.h>
 23 #include <linux/pm_runtime.h>
 24 #include <linux/mutex.h>
 25 #include <linux/mfd/core.h>
 26 #include <linux/mfd/samsung/core.h>
 27 #include <linux/mfd/samsung/irq.h>
 28 #include <linux/mfd/samsung/rtc.h>
 29 #include <linux/mfd/samsung/s2mpa01.h>
 30 #include <linux/mfd/samsung/s2mps11.h>
 31 #include <linux/mfd/samsung/s2mps14.h>
 32 #include <linux/mfd/samsung/s5m8763.h>
 33 #include <linux/mfd/samsung/s5m8767.h>
 34 #include <linux/regmap.h>
 35 
 36 static const struct mfd_cell s5m8751_devs[] = {
 37         {
 38                 .name = "s5m8751-pmic",
 39         }, {
 40                 .name = "s5m-charger",
 41         }, {
 42                 .name = "s5m8751-codec",
 43         },
 44 };
 45 
 46 static const struct mfd_cell s5m8763_devs[] = {
 47         {
 48                 .name = "s5m8763-pmic",
 49         }, {
 50                 .name = "s5m-rtc",
 51         }, {
 52                 .name = "s5m-charger",
 53         },
 54 };
 55 
 56 static const struct mfd_cell s5m8767_devs[] = {
 57         {
 58                 .name = "s5m8767-pmic",
 59         }, {
 60                 .name = "s5m-rtc",
 61         }, {
 62                 .name = "s5m8767-clk",
 63                 .of_compatible = "samsung,s5m8767-clk",
 64         }
 65 };
 66 
 67 static const struct mfd_cell s2mps11_devs[] = {
 68         {
 69                 .name = "s2mps11-pmic",
 70         }, {
 71                 .name = "s2mps11-clk",
 72                 .of_compatible = "samsung,s2mps11-clk",
 73         }
 74 };
 75 
 76 static const struct mfd_cell s2mps14_devs[] = {
 77         {
 78                 .name = "s2mps14-pmic",
 79         }, {
 80                 .name = "s2mps14-rtc",
 81         }, {
 82                 .name = "s2mps14-clk",
 83                 .of_compatible = "samsung,s2mps14-clk",
 84         }
 85 };
 86 
 87 static const struct mfd_cell s2mpa01_devs[] = {
 88         {
 89                 .name = "s2mpa01-pmic",
 90         },
 91 };
 92 
 93 #ifdef CONFIG_OF
 94 static struct of_device_id sec_dt_match[] = {
 95         {       .compatible = "samsung,s5m8767-pmic",
 96                 .data = (void *)S5M8767X,
 97         }, {
 98                 .compatible = "samsung,s2mps11-pmic",
 99                 .data = (void *)S2MPS11X,
100         }, {
101                 .compatible = "samsung,s2mps14-pmic",
102                 .data = (void *)S2MPS14X,
103         }, {
104                 .compatible = "samsung,s2mpa01-pmic",
105                 .data = (void *)S2MPA01,
106         }, {
107                 /* Sentinel */
108         },
109 };
110 #endif
111 
112 static bool s2mpa01_volatile(struct device *dev, unsigned int reg)
113 {
114         switch (reg) {
115         case S2MPA01_REG_INT1M:
116         case S2MPA01_REG_INT2M:
117         case S2MPA01_REG_INT3M:
118                 return false;
119         default:
120                 return true;
121         }
122 }
123 
124 static bool s2mps11_volatile(struct device *dev, unsigned int reg)
125 {
126         switch (reg) {
127         case S2MPS11_REG_INT1M:
128         case S2MPS11_REG_INT2M:
129         case S2MPS11_REG_INT3M:
130                 return false;
131         default:
132                 return true;
133         }
134 }
135 
136 static bool s5m8763_volatile(struct device *dev, unsigned int reg)
137 {
138         switch (reg) {
139         case S5M8763_REG_IRQM1:
140         case S5M8763_REG_IRQM2:
141         case S5M8763_REG_IRQM3:
142         case S5M8763_REG_IRQM4:
143                 return false;
144         default:
145                 return true;
146         }
147 }
148 
149 static const struct regmap_config sec_regmap_config = {
150         .reg_bits = 8,
151         .val_bits = 8,
152 };
153 
154 static const struct regmap_config s2mpa01_regmap_config = {
155         .reg_bits = 8,
156         .val_bits = 8,
157 
158         .max_register = S2MPA01_REG_LDO_OVCB4,
159         .volatile_reg = s2mpa01_volatile,
160         .cache_type = REGCACHE_FLAT,
161 };
162 
163 static const struct regmap_config s2mps11_regmap_config = {
164         .reg_bits = 8,
165         .val_bits = 8,
166 
167         .max_register = S2MPS11_REG_L38CTRL,
168         .volatile_reg = s2mps11_volatile,
169         .cache_type = REGCACHE_FLAT,
170 };
171 
172 static const struct regmap_config s2mps14_regmap_config = {
173         .reg_bits = 8,
174         .val_bits = 8,
175 
176         .max_register = S2MPS14_REG_LDODSCH3,
177         .volatile_reg = s2mps11_volatile,
178         .cache_type = REGCACHE_FLAT,
179 };
180 
181 static const struct regmap_config s5m8763_regmap_config = {
182         .reg_bits = 8,
183         .val_bits = 8,
184 
185         .max_register = S5M8763_REG_LBCNFG2,
186         .volatile_reg = s5m8763_volatile,
187         .cache_type = REGCACHE_FLAT,
188 };
189 
190 static const struct regmap_config s5m8767_regmap_config = {
191         .reg_bits = 8,
192         .val_bits = 8,
193 
194         .max_register = S5M8767_REG_LDO28CTRL,
195         .volatile_reg = s2mps11_volatile,
196         .cache_type = REGCACHE_FLAT,
197 };
198 
199 static const struct regmap_config s5m_rtc_regmap_config = {
200         .reg_bits = 8,
201         .val_bits = 8,
202 
203         .max_register = SEC_RTC_REG_MAX,
204 };
205 
206 static const struct regmap_config s2mps14_rtc_regmap_config = {
207         .reg_bits = 8,
208         .val_bits = 8,
209 
210         .max_register = S2MPS_RTC_REG_MAX,
211 };
212 
213 #ifdef CONFIG_OF
214 /*
215  * Only the common platform data elements for s5m8767 are parsed here from the
216  * device tree. Other sub-modules of s5m8767 such as pmic, rtc , charger and
217  * others have to parse their own platform data elements from device tree.
218  *
219  * The s5m8767 platform data structure is instantiated here and the drivers for
220  * the sub-modules need not instantiate another instance while parsing their
221  * platform data.
222  */
223 static struct sec_platform_data *sec_pmic_i2c_parse_dt_pdata(
224                                         struct device *dev)
225 {
226         struct sec_platform_data *pd;
227 
228         pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
229         if (!pd) {
230                 dev_err(dev, "could not allocate memory for pdata\n");
231                 return ERR_PTR(-ENOMEM);
232         }
233 
234         /*
235          * ToDo: the 'wakeup' member in the platform data is more of a linux
236          * specfic information. Hence, there is no binding for that yet and
237          * not parsed here.
238          */
239 
240         return pd;
241 }
242 #else
243 static struct sec_platform_data *sec_pmic_i2c_parse_dt_pdata(
244                                         struct device *dev)
245 {
246         return NULL;
247 }
248 #endif
249 
250 static inline unsigned long sec_i2c_get_driver_data(struct i2c_client *i2c,
251                                                 const struct i2c_device_id *id)
252 {
253 #ifdef CONFIG_OF
254         if (i2c->dev.of_node) {
255                 const struct of_device_id *match;
256                 match = of_match_node(sec_dt_match, i2c->dev.of_node);
257                 return (unsigned long)match->data;
258         }
259 #endif
260         return id->driver_data;
261 }
262 
263 static int sec_pmic_probe(struct i2c_client *i2c,
264                             const struct i2c_device_id *id)
265 {
266         struct sec_platform_data *pdata = dev_get_platdata(&i2c->dev);
267         const struct regmap_config *regmap, *regmap_rtc;
268         struct sec_pmic_dev *sec_pmic;
269         int ret;
270 
271         sec_pmic = devm_kzalloc(&i2c->dev, sizeof(struct sec_pmic_dev),
272                                 GFP_KERNEL);
273         if (sec_pmic == NULL)
274                 return -ENOMEM;
275 
276         i2c_set_clientdata(i2c, sec_pmic);
277         sec_pmic->dev = &i2c->dev;
278         sec_pmic->i2c = i2c;
279         sec_pmic->irq = i2c->irq;
280         sec_pmic->type = sec_i2c_get_driver_data(i2c, id);
281 
282         if (sec_pmic->dev->of_node) {
283                 pdata = sec_pmic_i2c_parse_dt_pdata(sec_pmic->dev);
284                 if (IS_ERR(pdata)) {
285                         ret = PTR_ERR(pdata);
286                         return ret;
287                 }
288                 pdata->device_type = sec_pmic->type;
289         }
290         if (pdata) {
291                 sec_pmic->device_type = pdata->device_type;
292                 sec_pmic->ono = pdata->ono;
293                 sec_pmic->irq_base = pdata->irq_base;
294                 sec_pmic->wakeup = pdata->wakeup;
295                 sec_pmic->pdata = pdata;
296         }
297 
298         switch (sec_pmic->device_type) {
299         case S2MPA01:
300                 regmap = &s2mpa01_regmap_config;
301                 /*
302                  * The rtc-s5m driver does not support S2MPA01 and there
303                  * is no mfd_cell for S2MPA01 RTC device.
304                  * However we must pass something to devm_regmap_init_i2c()
305                  * so use S5M-like regmap config even though it wouldn't work.
306                  */
307                 regmap_rtc = &s5m_rtc_regmap_config;
308                 break;
309         case S2MPS11X:
310                 regmap = &s2mps11_regmap_config;
311                 /*
312                  * The rtc-s5m driver does not support S2MPS11 and there
313                  * is no mfd_cell for S2MPS11 RTC device.
314                  * However we must pass something to devm_regmap_init_i2c()
315                  * so use S5M-like regmap config even though it wouldn't work.
316                  */
317                 regmap_rtc = &s5m_rtc_regmap_config;
318                 break;
319         case S2MPS14X:
320                 regmap = &s2mps14_regmap_config;
321                 regmap_rtc = &s2mps14_rtc_regmap_config;
322                 break;
323         case S5M8763X:
324                 regmap = &s5m8763_regmap_config;
325                 regmap_rtc = &s5m_rtc_regmap_config;
326                 break;
327         case S5M8767X:
328                 regmap = &s5m8767_regmap_config;
329                 regmap_rtc = &s5m_rtc_regmap_config;
330                 break;
331         default:
332                 regmap = &sec_regmap_config;
333                 regmap_rtc = &s5m_rtc_regmap_config;
334                 break;
335         }
336 
337         sec_pmic->regmap_pmic = devm_regmap_init_i2c(i2c, regmap);
338         if (IS_ERR(sec_pmic->regmap_pmic)) {
339                 ret = PTR_ERR(sec_pmic->regmap_pmic);
340                 dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
341                         ret);
342                 return ret;
343         }
344 
345         sec_pmic->rtc = i2c_new_dummy(i2c->adapter, RTC_I2C_ADDR);
346         if (!sec_pmic->rtc) {
347                 dev_err(&i2c->dev, "Failed to allocate I2C for RTC\n");
348                 return -ENODEV;
349         }
350         i2c_set_clientdata(sec_pmic->rtc, sec_pmic);
351 
352         sec_pmic->regmap_rtc = devm_regmap_init_i2c(sec_pmic->rtc, regmap_rtc);
353         if (IS_ERR(sec_pmic->regmap_rtc)) {
354                 ret = PTR_ERR(sec_pmic->regmap_rtc);
355                 dev_err(&i2c->dev, "Failed to allocate RTC register map: %d\n",
356                         ret);
357                 goto err_regmap_rtc;
358         }
359 
360         if (pdata && pdata->cfg_pmic_irq)
361                 pdata->cfg_pmic_irq();
362 
363         sec_irq_init(sec_pmic);
364 
365         pm_runtime_set_active(sec_pmic->dev);
366 
367         switch (sec_pmic->device_type) {
368         case S5M8751X:
369                 ret = mfd_add_devices(sec_pmic->dev, -1, s5m8751_devs,
370                                       ARRAY_SIZE(s5m8751_devs), NULL, 0, NULL);
371                 break;
372         case S5M8763X:
373                 ret = mfd_add_devices(sec_pmic->dev, -1, s5m8763_devs,
374                                       ARRAY_SIZE(s5m8763_devs), NULL, 0, NULL);
375                 break;
376         case S5M8767X:
377                 ret = mfd_add_devices(sec_pmic->dev, -1, s5m8767_devs,
378                                       ARRAY_SIZE(s5m8767_devs), NULL, 0, NULL);
379                 break;
380         case S2MPA01:
381                 ret = mfd_add_devices(sec_pmic->dev, -1, s2mpa01_devs,
382                                       ARRAY_SIZE(s2mpa01_devs), NULL, 0, NULL);
383                 break;
384         case S2MPS11X:
385                 ret = mfd_add_devices(sec_pmic->dev, -1, s2mps11_devs,
386                                       ARRAY_SIZE(s2mps11_devs), NULL, 0, NULL);
387                 break;
388         case S2MPS14X:
389                 ret = mfd_add_devices(sec_pmic->dev, -1, s2mps14_devs,
390                                       ARRAY_SIZE(s2mps14_devs), NULL, 0, NULL);
391                 break;
392         default:
393                 /* If this happens the probe function is problem */
394                 BUG();
395         }
396 
397         if (ret)
398                 goto err_mfd;
399 
400         device_init_wakeup(sec_pmic->dev, sec_pmic->wakeup);
401 
402         return ret;
403 
404 err_mfd:
405         sec_irq_exit(sec_pmic);
406 err_regmap_rtc:
407         i2c_unregister_device(sec_pmic->rtc);
408         return ret;
409 }
410 
411 static int sec_pmic_remove(struct i2c_client *i2c)
412 {
413         struct sec_pmic_dev *sec_pmic = i2c_get_clientdata(i2c);
414 
415         mfd_remove_devices(sec_pmic->dev);
416         sec_irq_exit(sec_pmic);
417         i2c_unregister_device(sec_pmic->rtc);
418         return 0;
419 }
420 
421 #ifdef CONFIG_PM_SLEEP
422 static int sec_pmic_suspend(struct device *dev)
423 {
424         struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
425         struct sec_pmic_dev *sec_pmic = i2c_get_clientdata(i2c);
426 
427         if (device_may_wakeup(dev)) {
428                 enable_irq_wake(sec_pmic->irq);
429                 /*
430                  * PMIC IRQ must be disabled during suspend for RTC alarm
431                  * to work properly.
432                  * When device is woken up from suspend by RTC Alarm, an
433                  * interrupt occurs before resuming I2C bus controller.
434                  * The interrupt is handled by regmap_irq_thread which tries
435                  * to read RTC registers. This read fails (I2C is still
436                  * suspended) and RTC Alarm interrupt is disabled.
437                  */
438                 disable_irq(sec_pmic->irq);
439         }
440 
441         return 0;
442 }
443 
444 static int sec_pmic_resume(struct device *dev)
445 {
446         struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
447         struct sec_pmic_dev *sec_pmic = i2c_get_clientdata(i2c);
448 
449         if (device_may_wakeup(dev)) {
450                 disable_irq_wake(sec_pmic->irq);
451                 enable_irq(sec_pmic->irq);
452         }
453 
454         return 0;
455 }
456 #endif /* CONFIG_PM_SLEEP */
457 
458 static SIMPLE_DEV_PM_OPS(sec_pmic_pm_ops, sec_pmic_suspend, sec_pmic_resume);
459 
460 static const struct i2c_device_id sec_pmic_id[] = {
461         { "sec_pmic", 0 },
462         { }
463 };
464 MODULE_DEVICE_TABLE(i2c, sec_pmic_id);
465 
466 static struct i2c_driver sec_pmic_driver = {
467         .driver = {
468                    .name = "sec_pmic",
469                    .owner = THIS_MODULE,
470                    .pm = &sec_pmic_pm_ops,
471                    .of_match_table = of_match_ptr(sec_dt_match),
472         },
473         .probe = sec_pmic_probe,
474         .remove = sec_pmic_remove,
475         .id_table = sec_pmic_id,
476 };
477 
478 static int __init sec_pmic_init(void)
479 {
480         return i2c_add_driver(&sec_pmic_driver);
481 }
482 
483 subsys_initcall(sec_pmic_init);
484 
485 static void __exit sec_pmic_exit(void)
486 {
487         i2c_del_driver(&sec_pmic_driver);
488 }
489 module_exit(sec_pmic_exit);
490 
491 MODULE_AUTHOR("Sangbeom Kim <sbkim73@samsung.com>");
492 MODULE_DESCRIPTION("Core support for the S5M MFD");
493 MODULE_LICENSE("GPL");
494 

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