Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16

Linux/drivers/mfd/max8998.c

  1 /*
  2  * max8998.c - mfd core driver for the Maxim 8998
  3  *
  4  *  Copyright (C) 2009-2010 Samsung Electronics
  5  *  Kyungmin Park <kyungmin.park@samsung.com>
  6  *  Marek Szyprowski <m.szyprowski@samsung.com>
  7  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License as published by
 10  * the Free Software Foundation; either version 2 of the License, or
 11  * (at your option) any later version.
 12  *
 13  * This program is distributed in the hope that it will be useful,
 14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 16  * GNU General Public License for more details.
 17  *
 18  * You should have received a copy of the GNU General Public License
 19  * along with this program; if not, write to the Free Software
 20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 21  */
 22 
 23 #include <linux/err.h>
 24 #include <linux/module.h>
 25 #include <linux/moduleparam.h>
 26 #include <linux/init.h>
 27 #include <linux/slab.h>
 28 #include <linux/i2c.h>
 29 #include <linux/interrupt.h>
 30 #include <linux/of.h>
 31 #include <linux/of_irq.h>
 32 #include <linux/pm_runtime.h>
 33 #include <linux/mutex.h>
 34 #include <linux/mfd/core.h>
 35 #include <linux/mfd/max8998.h>
 36 #include <linux/mfd/max8998-private.h>
 37 
 38 #define RTC_I2C_ADDR            (0x0c >> 1)
 39 
 40 static const struct mfd_cell max8998_devs[] = {
 41         {
 42                 .name = "max8998-pmic",
 43         }, {
 44                 .name = "max8998-rtc",
 45         }, {
 46                 .name = "max8998-battery",
 47         },
 48 };
 49 
 50 static const struct mfd_cell lp3974_devs[] = {
 51         {
 52                 .name = "lp3974-pmic",
 53         }, {
 54                 .name = "lp3974-rtc",
 55         },
 56 };
 57 
 58 int max8998_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest)
 59 {
 60         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
 61         int ret;
 62 
 63         mutex_lock(&max8998->iolock);
 64         ret = i2c_smbus_read_byte_data(i2c, reg);
 65         mutex_unlock(&max8998->iolock);
 66         if (ret < 0)
 67                 return ret;
 68 
 69         ret &= 0xff;
 70         *dest = ret;
 71         return 0;
 72 }
 73 EXPORT_SYMBOL(max8998_read_reg);
 74 
 75 int max8998_bulk_read(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
 76 {
 77         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
 78         int ret;
 79 
 80         mutex_lock(&max8998->iolock);
 81         ret = i2c_smbus_read_i2c_block_data(i2c, reg, count, buf);
 82         mutex_unlock(&max8998->iolock);
 83         if (ret < 0)
 84                 return ret;
 85 
 86         return 0;
 87 }
 88 EXPORT_SYMBOL(max8998_bulk_read);
 89 
 90 int max8998_write_reg(struct i2c_client *i2c, u8 reg, u8 value)
 91 {
 92         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
 93         int ret;
 94 
 95         mutex_lock(&max8998->iolock);
 96         ret = i2c_smbus_write_byte_data(i2c, reg, value);
 97         mutex_unlock(&max8998->iolock);
 98         return ret;
 99 }
100 EXPORT_SYMBOL(max8998_write_reg);
101 
102 int max8998_bulk_write(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
103 {
104         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
105         int ret;
106 
107         mutex_lock(&max8998->iolock);
108         ret = i2c_smbus_write_i2c_block_data(i2c, reg, count, buf);
109         mutex_unlock(&max8998->iolock);
110         if (ret < 0)
111                 return ret;
112 
113         return 0;
114 }
115 EXPORT_SYMBOL(max8998_bulk_write);
116 
117 int max8998_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask)
118 {
119         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
120         int ret;
121 
122         mutex_lock(&max8998->iolock);
123         ret = i2c_smbus_read_byte_data(i2c, reg);
124         if (ret >= 0) {
125                 u8 old_val = ret & 0xff;
126                 u8 new_val = (val & mask) | (old_val & (~mask));
127                 ret = i2c_smbus_write_byte_data(i2c, reg, new_val);
128         }
129         mutex_unlock(&max8998->iolock);
130         return ret;
131 }
132 EXPORT_SYMBOL(max8998_update_reg);
133 
134 #ifdef CONFIG_OF
135 static const struct of_device_id max8998_dt_match[] = {
136         { .compatible = "maxim,max8998", .data = (void *)TYPE_MAX8998 },
137         { .compatible = "national,lp3974", .data = (void *)TYPE_LP3974 },
138         { .compatible = "ti,lp3974", .data = (void *)TYPE_LP3974 },
139         {},
140 };
141 MODULE_DEVICE_TABLE(of, max8998_dt_match);
142 #endif
143 
144 /*
145  * Only the common platform data elements for max8998 are parsed here from the
146  * device tree. Other sub-modules of max8998 such as pmic, rtc and others have
147  * to parse their own platform data elements from device tree.
148  *
149  * The max8998 platform data structure is instantiated here and the drivers for
150  * the sub-modules need not instantiate another instance while parsing their
151  * platform data.
152  */
153 static struct max8998_platform_data *max8998_i2c_parse_dt_pdata(
154                                                         struct device *dev)
155 {
156         struct max8998_platform_data *pd;
157 
158         pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
159         if (!pd)
160                 return ERR_PTR(-ENOMEM);
161 
162         pd->ono = irq_of_parse_and_map(dev->of_node, 1);
163 
164         /*
165          * ToDo: the 'wakeup' member in the platform data is more of a linux
166          * specfic information. Hence, there is no binding for that yet and
167          * not parsed here.
168          */
169         return pd;
170 }
171 
172 static inline unsigned long max8998_i2c_get_driver_data(struct i2c_client *i2c,
173                                                 const struct i2c_device_id *id)
174 {
175         if (IS_ENABLED(CONFIG_OF) && i2c->dev.of_node) {
176                 const struct of_device_id *match;
177                 match = of_match_node(max8998_dt_match, i2c->dev.of_node);
178                 return (unsigned long)match->data;
179         }
180 
181         return id->driver_data;
182 }
183 
184 static int max8998_i2c_probe(struct i2c_client *i2c,
185                             const struct i2c_device_id *id)
186 {
187         struct max8998_platform_data *pdata = dev_get_platdata(&i2c->dev);
188         struct max8998_dev *max8998;
189         int ret = 0;
190 
191         max8998 = devm_kzalloc(&i2c->dev, sizeof(struct max8998_dev),
192                                 GFP_KERNEL);
193         if (max8998 == NULL)
194                 return -ENOMEM;
195 
196         if (IS_ENABLED(CONFIG_OF) && i2c->dev.of_node) {
197                 pdata = max8998_i2c_parse_dt_pdata(&i2c->dev);
198                 if (IS_ERR(pdata)) {
199                         ret = PTR_ERR(pdata);
200                         goto err;
201                 }
202         }
203 
204         i2c_set_clientdata(i2c, max8998);
205         max8998->dev = &i2c->dev;
206         max8998->i2c = i2c;
207         max8998->irq = i2c->irq;
208         max8998->type = max8998_i2c_get_driver_data(i2c, id);
209         max8998->pdata = pdata;
210         if (pdata) {
211                 max8998->ono = pdata->ono;
212                 max8998->irq_base = pdata->irq_base;
213                 max8998->wakeup = pdata->wakeup;
214         }
215         mutex_init(&max8998->iolock);
216 
217         max8998->rtc = i2c_new_dummy(i2c->adapter, RTC_I2C_ADDR);
218         if (!max8998->rtc) {
219                 dev_err(&i2c->dev, "Failed to allocate I2C device for RTC\n");
220                 return -ENODEV;
221         }
222         i2c_set_clientdata(max8998->rtc, max8998);
223 
224         max8998_irq_init(max8998);
225 
226         pm_runtime_set_active(max8998->dev);
227 
228         switch (max8998->type) {
229         case TYPE_LP3974:
230                 ret = mfd_add_devices(max8998->dev, -1,
231                                       lp3974_devs, ARRAY_SIZE(lp3974_devs),
232                                       NULL, 0, NULL);
233                 break;
234         case TYPE_MAX8998:
235                 ret = mfd_add_devices(max8998->dev, -1,
236                                       max8998_devs, ARRAY_SIZE(max8998_devs),
237                                       NULL, 0, NULL);
238                 break;
239         default:
240                 ret = -EINVAL;
241         }
242 
243         if (ret < 0)
244                 goto err;
245 
246         device_init_wakeup(max8998->dev, max8998->wakeup);
247 
248         return ret;
249 
250 err:
251         mfd_remove_devices(max8998->dev);
252         max8998_irq_exit(max8998);
253         i2c_unregister_device(max8998->rtc);
254         return ret;
255 }
256 
257 static int max8998_i2c_remove(struct i2c_client *i2c)
258 {
259         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
260 
261         mfd_remove_devices(max8998->dev);
262         max8998_irq_exit(max8998);
263         i2c_unregister_device(max8998->rtc);
264 
265         return 0;
266 }
267 
268 static const struct i2c_device_id max8998_i2c_id[] = {
269         { "max8998", TYPE_MAX8998 },
270         { "lp3974", TYPE_LP3974},
271         { }
272 };
273 MODULE_DEVICE_TABLE(i2c, max8998_i2c_id);
274 
275 static int max8998_suspend(struct device *dev)
276 {
277         struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
278         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
279 
280         if (device_may_wakeup(dev))
281                 irq_set_irq_wake(max8998->irq, 1);
282         return 0;
283 }
284 
285 static int max8998_resume(struct device *dev)
286 {
287         struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
288         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
289 
290         if (device_may_wakeup(dev))
291                 irq_set_irq_wake(max8998->irq, 0);
292         /*
293          * In LP3974, if IRQ registers are not "read & clear"
294          * when it's set during sleep, the interrupt becomes
295          * disabled.
296          */
297         return max8998_irq_resume(i2c_get_clientdata(i2c));
298 }
299 
300 struct max8998_reg_dump {
301         u8      addr;
302         u8      val;
303 };
304 #define SAVE_ITEM(x)    { .addr = (x), .val = 0x0, }
305 static struct max8998_reg_dump max8998_dump[] = {
306         SAVE_ITEM(MAX8998_REG_IRQM1),
307         SAVE_ITEM(MAX8998_REG_IRQM2),
308         SAVE_ITEM(MAX8998_REG_IRQM3),
309         SAVE_ITEM(MAX8998_REG_IRQM4),
310         SAVE_ITEM(MAX8998_REG_STATUSM1),
311         SAVE_ITEM(MAX8998_REG_STATUSM2),
312         SAVE_ITEM(MAX8998_REG_CHGR1),
313         SAVE_ITEM(MAX8998_REG_CHGR2),
314         SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1),
315         SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1),
316         SAVE_ITEM(MAX8998_REG_BUCK_ACTIVE_DISCHARGE3),
317         SAVE_ITEM(MAX8998_REG_ONOFF1),
318         SAVE_ITEM(MAX8998_REG_ONOFF2),
319         SAVE_ITEM(MAX8998_REG_ONOFF3),
320         SAVE_ITEM(MAX8998_REG_ONOFF4),
321         SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE1),
322         SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE2),
323         SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE3),
324         SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE4),
325         SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE1),
326         SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE2),
327         SAVE_ITEM(MAX8998_REG_LDO2_LDO3),
328         SAVE_ITEM(MAX8998_REG_LDO4),
329         SAVE_ITEM(MAX8998_REG_LDO5),
330         SAVE_ITEM(MAX8998_REG_LDO6),
331         SAVE_ITEM(MAX8998_REG_LDO7),
332         SAVE_ITEM(MAX8998_REG_LDO8_LDO9),
333         SAVE_ITEM(MAX8998_REG_LDO10_LDO11),
334         SAVE_ITEM(MAX8998_REG_LDO12),
335         SAVE_ITEM(MAX8998_REG_LDO13),
336         SAVE_ITEM(MAX8998_REG_LDO14),
337         SAVE_ITEM(MAX8998_REG_LDO15),
338         SAVE_ITEM(MAX8998_REG_LDO16),
339         SAVE_ITEM(MAX8998_REG_LDO17),
340         SAVE_ITEM(MAX8998_REG_BKCHR),
341         SAVE_ITEM(MAX8998_REG_LBCNFG1),
342         SAVE_ITEM(MAX8998_REG_LBCNFG2),
343 };
344 /* Save registers before hibernation */
345 static int max8998_freeze(struct device *dev)
346 {
347         struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
348         int i;
349 
350         for (i = 0; i < ARRAY_SIZE(max8998_dump); i++)
351                 max8998_read_reg(i2c, max8998_dump[i].addr,
352                                 &max8998_dump[i].val);
353 
354         return 0;
355 }
356 
357 /* Restore registers after hibernation */
358 static int max8998_restore(struct device *dev)
359 {
360         struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
361         int i;
362 
363         for (i = 0; i < ARRAY_SIZE(max8998_dump); i++)
364                 max8998_write_reg(i2c, max8998_dump[i].addr,
365                                 max8998_dump[i].val);
366 
367         return 0;
368 }
369 
370 static const struct dev_pm_ops max8998_pm = {
371         .suspend = max8998_suspend,
372         .resume = max8998_resume,
373         .freeze = max8998_freeze,
374         .restore = max8998_restore,
375 };
376 
377 static struct i2c_driver max8998_i2c_driver = {
378         .driver = {
379                    .name = "max8998",
380                    .owner = THIS_MODULE,
381                    .pm = &max8998_pm,
382                    .of_match_table = of_match_ptr(max8998_dt_match),
383         },
384         .probe = max8998_i2c_probe,
385         .remove = max8998_i2c_remove,
386         .id_table = max8998_i2c_id,
387 };
388 
389 static int __init max8998_i2c_init(void)
390 {
391         return i2c_add_driver(&max8998_i2c_driver);
392 }
393 /* init early so consumer devices can complete system boot */
394 subsys_initcall(max8998_i2c_init);
395 
396 static void __exit max8998_i2c_exit(void)
397 {
398         i2c_del_driver(&max8998_i2c_driver);
399 }
400 module_exit(max8998_i2c_exit);
401 
402 MODULE_DESCRIPTION("MAXIM 8998 multi-function core driver");
403 MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
404 MODULE_LICENSE("GPL");
405 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us