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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/init.h>
 25 #include <linux/slab.h>
 26 #include <linux/i2c.h>
 27 #include <linux/interrupt.h>
 28 #include <linux/of.h>
 29 #include <linux/of_irq.h>
 30 #include <linux/pm_runtime.h>
 31 #include <linux/mutex.h>
 32 #include <linux/mfd/core.h>
 33 #include <linux/mfd/max8998.h>
 34 #include <linux/mfd/max8998-private.h>
 35 
 36 #define RTC_I2C_ADDR            (0x0c >> 1)
 37 
 38 static const struct mfd_cell max8998_devs[] = {
 39         {
 40                 .name = "max8998-pmic",
 41         }, {
 42                 .name = "max8998-rtc",
 43         }, {
 44                 .name = "max8998-battery",
 45         },
 46 };
 47 
 48 static const struct mfd_cell lp3974_devs[] = {
 49         {
 50                 .name = "lp3974-pmic",
 51         }, {
 52                 .name = "lp3974-rtc",
 53         },
 54 };
 55 
 56 int max8998_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest)
 57 {
 58         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
 59         int ret;
 60 
 61         mutex_lock(&max8998->iolock);
 62         ret = i2c_smbus_read_byte_data(i2c, reg);
 63         mutex_unlock(&max8998->iolock);
 64         if (ret < 0)
 65                 return ret;
 66 
 67         ret &= 0xff;
 68         *dest = ret;
 69         return 0;
 70 }
 71 EXPORT_SYMBOL(max8998_read_reg);
 72 
 73 int max8998_bulk_read(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
 74 {
 75         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
 76         int ret;
 77 
 78         mutex_lock(&max8998->iolock);
 79         ret = i2c_smbus_read_i2c_block_data(i2c, reg, count, buf);
 80         mutex_unlock(&max8998->iolock);
 81         if (ret < 0)
 82                 return ret;
 83 
 84         return 0;
 85 }
 86 EXPORT_SYMBOL(max8998_bulk_read);
 87 
 88 int max8998_write_reg(struct i2c_client *i2c, u8 reg, u8 value)
 89 {
 90         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
 91         int ret;
 92 
 93         mutex_lock(&max8998->iolock);
 94         ret = i2c_smbus_write_byte_data(i2c, reg, value);
 95         mutex_unlock(&max8998->iolock);
 96         return ret;
 97 }
 98 EXPORT_SYMBOL(max8998_write_reg);
 99 
100 int max8998_bulk_write(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
101 {
102         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
103         int ret;
104 
105         mutex_lock(&max8998->iolock);
106         ret = i2c_smbus_write_i2c_block_data(i2c, reg, count, buf);
107         mutex_unlock(&max8998->iolock);
108         if (ret < 0)
109                 return ret;
110 
111         return 0;
112 }
113 EXPORT_SYMBOL(max8998_bulk_write);
114 
115 int max8998_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask)
116 {
117         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
118         int ret;
119 
120         mutex_lock(&max8998->iolock);
121         ret = i2c_smbus_read_byte_data(i2c, reg);
122         if (ret >= 0) {
123                 u8 old_val = ret & 0xff;
124                 u8 new_val = (val & mask) | (old_val & (~mask));
125                 ret = i2c_smbus_write_byte_data(i2c, reg, new_val);
126         }
127         mutex_unlock(&max8998->iolock);
128         return ret;
129 }
130 EXPORT_SYMBOL(max8998_update_reg);
131 
132 #ifdef CONFIG_OF
133 static const struct of_device_id max8998_dt_match[] = {
134         { .compatible = "maxim,max8998", .data = (void *)TYPE_MAX8998 },
135         { .compatible = "national,lp3974", .data = (void *)TYPE_LP3974 },
136         { .compatible = "ti,lp3974", .data = (void *)TYPE_LP3974 },
137         {},
138 };
139 #endif
140 
141 /*
142  * Only the common platform data elements for max8998 are parsed here from the
143  * device tree. Other sub-modules of max8998 such as pmic, rtc and others have
144  * to parse their own platform data elements from device tree.
145  *
146  * The max8998 platform data structure is instantiated here and the drivers for
147  * the sub-modules need not instantiate another instance while parsing their
148  * platform data.
149  */
150 static struct max8998_platform_data *max8998_i2c_parse_dt_pdata(
151                                                         struct device *dev)
152 {
153         struct max8998_platform_data *pd;
154 
155         pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
156         if (!pd)
157                 return ERR_PTR(-ENOMEM);
158 
159         pd->ono = irq_of_parse_and_map(dev->of_node, 1);
160 
161         /*
162          * ToDo: the 'wakeup' member in the platform data is more of a linux
163          * specfic information. Hence, there is no binding for that yet and
164          * not parsed here.
165          */
166         return pd;
167 }
168 
169 static inline unsigned long max8998_i2c_get_driver_data(struct i2c_client *i2c,
170                                                 const struct i2c_device_id *id)
171 {
172         if (IS_ENABLED(CONFIG_OF) && i2c->dev.of_node) {
173                 const struct of_device_id *match;
174                 match = of_match_node(max8998_dt_match, i2c->dev.of_node);
175                 return (unsigned long)match->data;
176         }
177 
178         return id->driver_data;
179 }
180 
181 static int max8998_i2c_probe(struct i2c_client *i2c,
182                             const struct i2c_device_id *id)
183 {
184         struct max8998_platform_data *pdata = dev_get_platdata(&i2c->dev);
185         struct max8998_dev *max8998;
186         int ret = 0;
187 
188         max8998 = devm_kzalloc(&i2c->dev, sizeof(struct max8998_dev),
189                                 GFP_KERNEL);
190         if (max8998 == NULL)
191                 return -ENOMEM;
192 
193         if (IS_ENABLED(CONFIG_OF) && i2c->dev.of_node) {
194                 pdata = max8998_i2c_parse_dt_pdata(&i2c->dev);
195                 if (IS_ERR(pdata)) {
196                         ret = PTR_ERR(pdata);
197                         goto err;
198                 }
199         }
200 
201         i2c_set_clientdata(i2c, max8998);
202         max8998->dev = &i2c->dev;
203         max8998->i2c = i2c;
204         max8998->irq = i2c->irq;
205         max8998->type = max8998_i2c_get_driver_data(i2c, id);
206         max8998->pdata = pdata;
207         if (pdata) {
208                 max8998->ono = pdata->ono;
209                 max8998->irq_base = pdata->irq_base;
210                 max8998->wakeup = pdata->wakeup;
211         }
212         mutex_init(&max8998->iolock);
213 
214         max8998->rtc = i2c_new_dummy(i2c->adapter, RTC_I2C_ADDR);
215         if (!max8998->rtc) {
216                 dev_err(&i2c->dev, "Failed to allocate I2C device for RTC\n");
217                 return -ENODEV;
218         }
219         i2c_set_clientdata(max8998->rtc, max8998);
220 
221         max8998_irq_init(max8998);
222 
223         pm_runtime_set_active(max8998->dev);
224 
225         switch (max8998->type) {
226         case TYPE_LP3974:
227                 ret = mfd_add_devices(max8998->dev, -1,
228                                       lp3974_devs, ARRAY_SIZE(lp3974_devs),
229                                       NULL, 0, NULL);
230                 break;
231         case TYPE_MAX8998:
232                 ret = mfd_add_devices(max8998->dev, -1,
233                                       max8998_devs, ARRAY_SIZE(max8998_devs),
234                                       NULL, 0, NULL);
235                 break;
236         default:
237                 ret = -EINVAL;
238         }
239 
240         if (ret < 0)
241                 goto err;
242 
243         device_init_wakeup(max8998->dev, max8998->wakeup);
244 
245         return ret;
246 
247 err:
248         mfd_remove_devices(max8998->dev);
249         max8998_irq_exit(max8998);
250         i2c_unregister_device(max8998->rtc);
251         return ret;
252 }
253 
254 static const struct i2c_device_id max8998_i2c_id[] = {
255         { "max8998", TYPE_MAX8998 },
256         { "lp3974", TYPE_LP3974},
257         { }
258 };
259 
260 static int max8998_suspend(struct device *dev)
261 {
262         struct i2c_client *i2c = to_i2c_client(dev);
263         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
264 
265         if (device_may_wakeup(dev))
266                 irq_set_irq_wake(max8998->irq, 1);
267         return 0;
268 }
269 
270 static int max8998_resume(struct device *dev)
271 {
272         struct i2c_client *i2c = to_i2c_client(dev);
273         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
274 
275         if (device_may_wakeup(dev))
276                 irq_set_irq_wake(max8998->irq, 0);
277         /*
278          * In LP3974, if IRQ registers are not "read & clear"
279          * when it's set during sleep, the interrupt becomes
280          * disabled.
281          */
282         return max8998_irq_resume(i2c_get_clientdata(i2c));
283 }
284 
285 struct max8998_reg_dump {
286         u8      addr;
287         u8      val;
288 };
289 #define SAVE_ITEM(x)    { .addr = (x), .val = 0x0, }
290 static struct max8998_reg_dump max8998_dump[] = {
291         SAVE_ITEM(MAX8998_REG_IRQM1),
292         SAVE_ITEM(MAX8998_REG_IRQM2),
293         SAVE_ITEM(MAX8998_REG_IRQM3),
294         SAVE_ITEM(MAX8998_REG_IRQM4),
295         SAVE_ITEM(MAX8998_REG_STATUSM1),
296         SAVE_ITEM(MAX8998_REG_STATUSM2),
297         SAVE_ITEM(MAX8998_REG_CHGR1),
298         SAVE_ITEM(MAX8998_REG_CHGR2),
299         SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1),
300         SAVE_ITEM(MAX8998_REG_LDO_ACTIVE_DISCHARGE1),
301         SAVE_ITEM(MAX8998_REG_BUCK_ACTIVE_DISCHARGE3),
302         SAVE_ITEM(MAX8998_REG_ONOFF1),
303         SAVE_ITEM(MAX8998_REG_ONOFF2),
304         SAVE_ITEM(MAX8998_REG_ONOFF3),
305         SAVE_ITEM(MAX8998_REG_ONOFF4),
306         SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE1),
307         SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE2),
308         SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE3),
309         SAVE_ITEM(MAX8998_REG_BUCK1_VOLTAGE4),
310         SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE1),
311         SAVE_ITEM(MAX8998_REG_BUCK2_VOLTAGE2),
312         SAVE_ITEM(MAX8998_REG_LDO2_LDO3),
313         SAVE_ITEM(MAX8998_REG_LDO4),
314         SAVE_ITEM(MAX8998_REG_LDO5),
315         SAVE_ITEM(MAX8998_REG_LDO6),
316         SAVE_ITEM(MAX8998_REG_LDO7),
317         SAVE_ITEM(MAX8998_REG_LDO8_LDO9),
318         SAVE_ITEM(MAX8998_REG_LDO10_LDO11),
319         SAVE_ITEM(MAX8998_REG_LDO12),
320         SAVE_ITEM(MAX8998_REG_LDO13),
321         SAVE_ITEM(MAX8998_REG_LDO14),
322         SAVE_ITEM(MAX8998_REG_LDO15),
323         SAVE_ITEM(MAX8998_REG_LDO16),
324         SAVE_ITEM(MAX8998_REG_LDO17),
325         SAVE_ITEM(MAX8998_REG_BKCHR),
326         SAVE_ITEM(MAX8998_REG_LBCNFG1),
327         SAVE_ITEM(MAX8998_REG_LBCNFG2),
328 };
329 /* Save registers before hibernation */
330 static int max8998_freeze(struct device *dev)
331 {
332         struct i2c_client *i2c = to_i2c_client(dev);
333         int i;
334 
335         for (i = 0; i < ARRAY_SIZE(max8998_dump); i++)
336                 max8998_read_reg(i2c, max8998_dump[i].addr,
337                                 &max8998_dump[i].val);
338 
339         return 0;
340 }
341 
342 /* Restore registers after hibernation */
343 static int max8998_restore(struct device *dev)
344 {
345         struct i2c_client *i2c = to_i2c_client(dev);
346         int i;
347 
348         for (i = 0; i < ARRAY_SIZE(max8998_dump); i++)
349                 max8998_write_reg(i2c, max8998_dump[i].addr,
350                                 max8998_dump[i].val);
351 
352         return 0;
353 }
354 
355 static const struct dev_pm_ops max8998_pm = {
356         .suspend = max8998_suspend,
357         .resume = max8998_resume,
358         .freeze = max8998_freeze,
359         .restore = max8998_restore,
360 };
361 
362 static struct i2c_driver max8998_i2c_driver = {
363         .driver = {
364                    .name = "max8998",
365                    .pm = &max8998_pm,
366                    .suppress_bind_attrs = true,
367                    .of_match_table = of_match_ptr(max8998_dt_match),
368         },
369         .probe = max8998_i2c_probe,
370         .id_table = max8998_i2c_id,
371 };
372 
373 static int __init max8998_i2c_init(void)
374 {
375         return i2c_add_driver(&max8998_i2c_driver);
376 }
377 /* init early so consumer devices can complete system boot */
378 subsys_initcall(max8998_i2c_init);
379 

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