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1 /*
2  * max8997.c - mfd core driver for the Maxim 8966 and 8997
3  *
4  * Copyright (C) 2011 Samsung Electronics
5  * MyungJoo Ham <myungjoo.ham@smasung.com>
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 2 of the License, or
10  * (at your option) any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
20  *
21  * This driver is based on max8998.c
22  */
23 
24 #include <linux/slab.h>
25 #include <linux/i2c.h>
26 #include <linux/interrupt.h>
27 #include <linux/pm_runtime.h>
28 #include <linux/module.h>
29 #include <linux/mutex.h>
30 #include <linux/mfd/core.h>
31 #include <linux/mfd/max8997.h>
32 #include <linux/mfd/max8997-private.h>
33 
34 #define I2C_ADDR_PMIC	(0xCC >> 1)
35 #define I2C_ADDR_MUIC	(0x4A >> 1)
36 #define I2C_ADDR_BATTERY	(0x6C >> 1)
37 #define I2C_ADDR_RTC	(0x0C >> 1)
38 #define I2C_ADDR_HAPTIC	(0x90 >> 1)
39 
40 static struct mfd_cell max8997_devs[] = {
41 	{ .name = "max8997-pmic", },
42 	{ .name = "max8997-rtc", },
43 	{ .name = "max8997-battery", },
44 	{ .name = "max8997-haptic", },
45 	{ .name = "max8997-muic", },
46 	{ .name = "max8997-led", .id = 1 },
47 	{ .name = "max8997-led", .id = 2 },
48 };
49 
max8997_read_reg(struct i2c_client * i2c,u8 reg,u8 * dest)50 int max8997_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest)
51 {
52 	struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
53 	int ret;
54 
55 	mutex_lock(&max8997->iolock);
56 	ret = i2c_smbus_read_byte_data(i2c, reg);
57 	mutex_unlock(&max8997->iolock);
58 	if (ret < 0)
59 		return ret;
60 
61 	ret &= 0xff;
62 	*dest = ret;
63 	return 0;
64 }
65 EXPORT_SYMBOL_GPL(max8997_read_reg);
66 
max8997_bulk_read(struct i2c_client * i2c,u8 reg,int count,u8 * buf)67 int max8997_bulk_read(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
68 {
69 	struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
70 	int ret;
71 
72 	mutex_lock(&max8997->iolock);
73 	ret = i2c_smbus_read_i2c_block_data(i2c, reg, count, buf);
74 	mutex_unlock(&max8997->iolock);
75 	if (ret < 0)
76 		return ret;
77 
78 	return 0;
79 }
80 EXPORT_SYMBOL_GPL(max8997_bulk_read);
81 
max8997_write_reg(struct i2c_client * i2c,u8 reg,u8 value)82 int max8997_write_reg(struct i2c_client *i2c, u8 reg, u8 value)
83 {
84 	struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
85 	int ret;
86 
87 	mutex_lock(&max8997->iolock);
88 	ret = i2c_smbus_write_byte_data(i2c, reg, value);
89 	mutex_unlock(&max8997->iolock);
90 	return ret;
91 }
92 EXPORT_SYMBOL_GPL(max8997_write_reg);
93 
max8997_bulk_write(struct i2c_client * i2c,u8 reg,int count,u8 * buf)94 int max8997_bulk_write(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
95 {
96 	struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
97 	int ret;
98 
99 	mutex_lock(&max8997->iolock);
100 	ret = i2c_smbus_write_i2c_block_data(i2c, reg, count, buf);
101 	mutex_unlock(&max8997->iolock);
102 	if (ret < 0)
103 		return ret;
104 
105 	return 0;
106 }
107 EXPORT_SYMBOL_GPL(max8997_bulk_write);
108 
max8997_update_reg(struct i2c_client * i2c,u8 reg,u8 val,u8 mask)109 int max8997_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask)
110 {
111 	struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
112 	int ret;
113 
114 	mutex_lock(&max8997->iolock);
115 	ret = i2c_smbus_read_byte_data(i2c, reg);
116 	if (ret >= 0) {
117 		u8 old_val = ret & 0xff;
118 		u8 new_val = (val & mask) | (old_val & (~mask));
119 		ret = i2c_smbus_write_byte_data(i2c, reg, new_val);
120 	}
121 	mutex_unlock(&max8997->iolock);
122 	return ret;
123 }
124 EXPORT_SYMBOL_GPL(max8997_update_reg);
125 
max8997_i2c_probe(struct i2c_client * i2c,const struct i2c_device_id * id)126 static int max8997_i2c_probe(struct i2c_client *i2c,
127 			    const struct i2c_device_id *id)
128 {
129 	struct max8997_dev *max8997;
130 	struct max8997_platform_data *pdata = i2c->dev.platform_data;
131 	int ret = 0;
132 
133 	max8997 = kzalloc(sizeof(struct max8997_dev), GFP_KERNEL);
134 	if (max8997 == NULL)
135 		return -ENOMEM;
136 
137 	i2c_set_clientdata(i2c, max8997);
138 	max8997->dev = &i2c->dev;
139 	max8997->i2c = i2c;
140 	max8997->type = id->driver_data;
141 	max8997->irq = i2c->irq;
142 
143 	if (!pdata)
144 		goto err;
145 
146 	max8997->irq_base = pdata->irq_base;
147 	max8997->ono = pdata->ono;
148 
149 	mutex_init(&max8997->iolock);
150 
151 	max8997->rtc = i2c_new_dummy(i2c->adapter, I2C_ADDR_RTC);
152 	i2c_set_clientdata(max8997->rtc, max8997);
153 	max8997->haptic = i2c_new_dummy(i2c->adapter, I2C_ADDR_HAPTIC);
154 	i2c_set_clientdata(max8997->haptic, max8997);
155 	max8997->muic = i2c_new_dummy(i2c->adapter, I2C_ADDR_MUIC);
156 	i2c_set_clientdata(max8997->muic, max8997);
157 
158 	pm_runtime_set_active(max8997->dev);
159 
160 	max8997_irq_init(max8997);
161 
162 	mfd_add_devices(max8997->dev, -1, max8997_devs,
163 			ARRAY_SIZE(max8997_devs),
164 			NULL, 0);
165 
166 	/*
167 	 * TODO: enable others (flash, muic, rtc, battery, ...) and
168 	 * check the return value
169 	 */
170 
171 	if (ret < 0)
172 		goto err_mfd;
173 
174 	/* MAX8997 has a power button input. */
175 	device_init_wakeup(max8997->dev, pdata->wakeup);
176 
177 	return ret;
178 
179 err_mfd:
180 	mfd_remove_devices(max8997->dev);
181 	i2c_unregister_device(max8997->muic);
182 	i2c_unregister_device(max8997->haptic);
183 	i2c_unregister_device(max8997->rtc);
184 err:
185 	kfree(max8997);
186 	return ret;
187 }
188 
max8997_i2c_remove(struct i2c_client * i2c)189 static int max8997_i2c_remove(struct i2c_client *i2c)
190 {
191 	struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
192 
193 	mfd_remove_devices(max8997->dev);
194 	i2c_unregister_device(max8997->muic);
195 	i2c_unregister_device(max8997->haptic);
196 	i2c_unregister_device(max8997->rtc);
197 	kfree(max8997);
198 
199 	return 0;
200 }
201 
202 static const struct i2c_device_id max8997_i2c_id[] = {
203 	{ "max8997", TYPE_MAX8997 },
204 	{ "max8966", TYPE_MAX8966 },
205 	{ }
206 };
207 MODULE_DEVICE_TABLE(i2c, max8998_i2c_id);
208 
209 u8 max8997_dumpaddr_pmic[] = {
210 	MAX8997_REG_INT1MSK,
211 	MAX8997_REG_INT2MSK,
212 	MAX8997_REG_INT3MSK,
213 	MAX8997_REG_INT4MSK,
214 	MAX8997_REG_MAINCON1,
215 	MAX8997_REG_MAINCON2,
216 	MAX8997_REG_BUCKRAMP,
217 	MAX8997_REG_BUCK1CTRL,
218 	MAX8997_REG_BUCK1DVS1,
219 	MAX8997_REG_BUCK1DVS2,
220 	MAX8997_REG_BUCK1DVS3,
221 	MAX8997_REG_BUCK1DVS4,
222 	MAX8997_REG_BUCK1DVS5,
223 	MAX8997_REG_BUCK1DVS6,
224 	MAX8997_REG_BUCK1DVS7,
225 	MAX8997_REG_BUCK1DVS8,
226 	MAX8997_REG_BUCK2CTRL,
227 	MAX8997_REG_BUCK2DVS1,
228 	MAX8997_REG_BUCK2DVS2,
229 	MAX8997_REG_BUCK2DVS3,
230 	MAX8997_REG_BUCK2DVS4,
231 	MAX8997_REG_BUCK2DVS5,
232 	MAX8997_REG_BUCK2DVS6,
233 	MAX8997_REG_BUCK2DVS7,
234 	MAX8997_REG_BUCK2DVS8,
235 	MAX8997_REG_BUCK3CTRL,
236 	MAX8997_REG_BUCK3DVS,
237 	MAX8997_REG_BUCK4CTRL,
238 	MAX8997_REG_BUCK4DVS,
239 	MAX8997_REG_BUCK5CTRL,
240 	MAX8997_REG_BUCK5DVS1,
241 	MAX8997_REG_BUCK5DVS2,
242 	MAX8997_REG_BUCK5DVS3,
243 	MAX8997_REG_BUCK5DVS4,
244 	MAX8997_REG_BUCK5DVS5,
245 	MAX8997_REG_BUCK5DVS6,
246 	MAX8997_REG_BUCK5DVS7,
247 	MAX8997_REG_BUCK5DVS8,
248 	MAX8997_REG_BUCK6CTRL,
249 	MAX8997_REG_BUCK6BPSKIPCTRL,
250 	MAX8997_REG_BUCK7CTRL,
251 	MAX8997_REG_BUCK7DVS,
252 	MAX8997_REG_LDO1CTRL,
253 	MAX8997_REG_LDO2CTRL,
254 	MAX8997_REG_LDO3CTRL,
255 	MAX8997_REG_LDO4CTRL,
256 	MAX8997_REG_LDO5CTRL,
257 	MAX8997_REG_LDO6CTRL,
258 	MAX8997_REG_LDO7CTRL,
259 	MAX8997_REG_LDO8CTRL,
260 	MAX8997_REG_LDO9CTRL,
261 	MAX8997_REG_LDO10CTRL,
262 	MAX8997_REG_LDO11CTRL,
263 	MAX8997_REG_LDO12CTRL,
264 	MAX8997_REG_LDO13CTRL,
265 	MAX8997_REG_LDO14CTRL,
266 	MAX8997_REG_LDO15CTRL,
267 	MAX8997_REG_LDO16CTRL,
268 	MAX8997_REG_LDO17CTRL,
269 	MAX8997_REG_LDO18CTRL,
270 	MAX8997_REG_LDO21CTRL,
271 	MAX8997_REG_MBCCTRL1,
272 	MAX8997_REG_MBCCTRL2,
273 	MAX8997_REG_MBCCTRL3,
274 	MAX8997_REG_MBCCTRL4,
275 	MAX8997_REG_MBCCTRL5,
276 	MAX8997_REG_MBCCTRL6,
277 	MAX8997_REG_OTPCGHCVS,
278 	MAX8997_REG_SAFEOUTCTRL,
279 	MAX8997_REG_LBCNFG1,
280 	MAX8997_REG_LBCNFG2,
281 	MAX8997_REG_BBCCTRL,
282 
283 	MAX8997_REG_FLASH1_CUR,
284 	MAX8997_REG_FLASH2_CUR,
285 	MAX8997_REG_MOVIE_CUR,
286 	MAX8997_REG_GSMB_CUR,
287 	MAX8997_REG_BOOST_CNTL,
288 	MAX8997_REG_LEN_CNTL,
289 	MAX8997_REG_FLASH_CNTL,
290 	MAX8997_REG_WDT_CNTL,
291 	MAX8997_REG_MAXFLASH1,
292 	MAX8997_REG_MAXFLASH2,
293 	MAX8997_REG_FLASHSTATUSMASK,
294 
295 	MAX8997_REG_GPIOCNTL1,
296 	MAX8997_REG_GPIOCNTL2,
297 	MAX8997_REG_GPIOCNTL3,
298 	MAX8997_REG_GPIOCNTL4,
299 	MAX8997_REG_GPIOCNTL5,
300 	MAX8997_REG_GPIOCNTL6,
301 	MAX8997_REG_GPIOCNTL7,
302 	MAX8997_REG_GPIOCNTL8,
303 	MAX8997_REG_GPIOCNTL9,
304 	MAX8997_REG_GPIOCNTL10,
305 	MAX8997_REG_GPIOCNTL11,
306 	MAX8997_REG_GPIOCNTL12,
307 
308 	MAX8997_REG_LDO1CONFIG,
309 	MAX8997_REG_LDO2CONFIG,
310 	MAX8997_REG_LDO3CONFIG,
311 	MAX8997_REG_LDO4CONFIG,
312 	MAX8997_REG_LDO5CONFIG,
313 	MAX8997_REG_LDO6CONFIG,
314 	MAX8997_REG_LDO7CONFIG,
315 	MAX8997_REG_LDO8CONFIG,
316 	MAX8997_REG_LDO9CONFIG,
317 	MAX8997_REG_LDO10CONFIG,
318 	MAX8997_REG_LDO11CONFIG,
319 	MAX8997_REG_LDO12CONFIG,
320 	MAX8997_REG_LDO13CONFIG,
321 	MAX8997_REG_LDO14CONFIG,
322 	MAX8997_REG_LDO15CONFIG,
323 	MAX8997_REG_LDO16CONFIG,
324 	MAX8997_REG_LDO17CONFIG,
325 	MAX8997_REG_LDO18CONFIG,
326 	MAX8997_REG_LDO21CONFIG,
327 
328 	MAX8997_REG_DVSOKTIMER1,
329 	MAX8997_REG_DVSOKTIMER2,
330 	MAX8997_REG_DVSOKTIMER4,
331 	MAX8997_REG_DVSOKTIMER5,
332 };
333 
334 u8 max8997_dumpaddr_muic[] = {
335 	MAX8997_MUIC_REG_INTMASK1,
336 	MAX8997_MUIC_REG_INTMASK2,
337 	MAX8997_MUIC_REG_INTMASK3,
338 	MAX8997_MUIC_REG_CDETCTRL,
339 	MAX8997_MUIC_REG_CONTROL1,
340 	MAX8997_MUIC_REG_CONTROL2,
341 	MAX8997_MUIC_REG_CONTROL3,
342 };
343 
344 u8 max8997_dumpaddr_haptic[] = {
345 	MAX8997_HAPTIC_REG_CONF1,
346 	MAX8997_HAPTIC_REG_CONF2,
347 	MAX8997_HAPTIC_REG_DRVCONF,
348 	MAX8997_HAPTIC_REG_CYCLECONF1,
349 	MAX8997_HAPTIC_REG_CYCLECONF2,
350 	MAX8997_HAPTIC_REG_SIGCONF1,
351 	MAX8997_HAPTIC_REG_SIGCONF2,
352 	MAX8997_HAPTIC_REG_SIGCONF3,
353 	MAX8997_HAPTIC_REG_SIGCONF4,
354 	MAX8997_HAPTIC_REG_SIGDC1,
355 	MAX8997_HAPTIC_REG_SIGDC2,
356 	MAX8997_HAPTIC_REG_SIGPWMDC1,
357 	MAX8997_HAPTIC_REG_SIGPWMDC2,
358 	MAX8997_HAPTIC_REG_SIGPWMDC3,
359 	MAX8997_HAPTIC_REG_SIGPWMDC4,
360 };
361 
max8997_freeze(struct device * dev)362 static int max8997_freeze(struct device *dev)
363 {
364 	struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
365 	struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
366 	int i;
367 
368 	for (i = 0; i < ARRAY_SIZE(max8997_dumpaddr_pmic); i++)
369 		max8997_read_reg(i2c, max8997_dumpaddr_pmic[i],
370 				&max8997->reg_dump[i]);
371 
372 	for (i = 0; i < ARRAY_SIZE(max8997_dumpaddr_muic); i++)
373 		max8997_read_reg(i2c, max8997_dumpaddr_muic[i],
374 				&max8997->reg_dump[i + MAX8997_REG_PMIC_END]);
375 
376 	for (i = 0; i < ARRAY_SIZE(max8997_dumpaddr_haptic); i++)
377 		max8997_read_reg(i2c, max8997_dumpaddr_haptic[i],
378 				&max8997->reg_dump[i + MAX8997_REG_PMIC_END +
379 				MAX8997_MUIC_REG_END]);
380 
381 	return 0;
382 }
383 
max8997_restore(struct device * dev)384 static int max8997_restore(struct device *dev)
385 {
386 	struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
387 	struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
388 	int i;
389 
390 	for (i = 0; i < ARRAY_SIZE(max8997_dumpaddr_pmic); i++)
391 		max8997_write_reg(i2c, max8997_dumpaddr_pmic[i],
392 				max8997->reg_dump[i]);
393 
394 	for (i = 0; i < ARRAY_SIZE(max8997_dumpaddr_muic); i++)
395 		max8997_write_reg(i2c, max8997_dumpaddr_muic[i],
396 				max8997->reg_dump[i + MAX8997_REG_PMIC_END]);
397 
398 	for (i = 0; i < ARRAY_SIZE(max8997_dumpaddr_haptic); i++)
399 		max8997_write_reg(i2c, max8997_dumpaddr_haptic[i],
400 				max8997->reg_dump[i + MAX8997_REG_PMIC_END +
401 				MAX8997_MUIC_REG_END]);
402 
403 	return 0;
404 }
405 
max8997_suspend(struct device * dev)406 static int max8997_suspend(struct device *dev)
407 {
408 	struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
409 	struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
410 
411 	if (device_may_wakeup(dev))
412 		irq_set_irq_wake(max8997->irq, 1);
413 	return 0;
414 }
415 
max8997_resume(struct device * dev)416 static int max8997_resume(struct device *dev)
417 {
418 	struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
419 	struct max8997_dev *max8997 = i2c_get_clientdata(i2c);
420 
421 	if (device_may_wakeup(dev))
422 		irq_set_irq_wake(max8997->irq, 0);
423 	return max8997_irq_resume(max8997);
424 }
425 
426 const struct dev_pm_ops max8997_pm = {
427 	.suspend = max8997_suspend,
428 	.resume = max8997_resume,
429 	.freeze = max8997_freeze,
430 	.restore = max8997_restore,
431 };
432 
433 static struct i2c_driver max8997_i2c_driver = {
434 	.driver = {
435 		   .name = "max8997",
436 		   .owner = THIS_MODULE,
437 		   .pm = &max8997_pm,
438 	},
439 	.probe = max8997_i2c_probe,
440 	.remove = max8997_i2c_remove,
441 	.id_table = max8997_i2c_id,
442 };
443 
max8997_i2c_init(void)444 static int __init max8997_i2c_init(void)
445 {
446 	return i2c_add_driver(&max8997_i2c_driver);
447 }
448 /* init early so consumer devices can complete system boot */
449 subsys_initcall(max8997_i2c_init);
450 
max8997_i2c_exit(void)451 static void __exit max8997_i2c_exit(void)
452 {
453 	i2c_del_driver(&max8997_i2c_driver);
454 }
455 module_exit(max8997_i2c_exit);
456 
457 MODULE_DESCRIPTION("MAXIM 8997 multi-function core driver");
458 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
459 MODULE_LICENSE("GPL");
460