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

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