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dae8a969 | 1 | /* |
a259f389 | 2 | * max77686.c - mfd core driver for the Maxim 77686/802 |
dae8a969 JL |
3 | * |
4 | * Copyright (C) 2012 Samsung Electronics | |
5 | * Chiwoong Byun <woong.byun@smasung.com> | |
6 | * Jonghwa Lee <jonghwa3.lee@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 | * This driver is based on max8997.c | |
23 | */ | |
24 | ||
25 | #include <linux/export.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/i2c.h> | |
6f1c1e71 JMC |
28 | #include <linux/irq.h> |
29 | #include <linux/interrupt.h> | |
dae8a969 JL |
30 | #include <linux/pm_runtime.h> |
31 | #include <linux/module.h> | |
dae8a969 JL |
32 | #include <linux/mfd/core.h> |
33 | #include <linux/mfd/max77686.h> | |
34 | #include <linux/mfd/max77686-private.h> | |
35 | #include <linux/err.h> | |
2a048d3b | 36 | #include <linux/of.h> |
dae8a969 JL |
37 | |
38 | #define I2C_ADDR_RTC (0x0C >> 1) | |
39 | ||
7c0517b1 | 40 | static const struct mfd_cell max77686_devs[] = { |
dae8a969 JL |
41 | { .name = "max77686-pmic", }, |
42 | { .name = "max77686-rtc", }, | |
c0fa7e10 | 43 | { .name = "max77686-clk", }, |
dae8a969 JL |
44 | }; |
45 | ||
a259f389 JMC |
46 | static const struct mfd_cell max77802_devs[] = { |
47 | { .name = "max77802-pmic", }, | |
48 | { .name = "max77802-clk", }, | |
49 | { .name = "max77802-rtc", }, | |
50 | }; | |
51 | ||
52 | static bool max77802_pmic_is_accessible_reg(struct device *dev, | |
53 | unsigned int reg) | |
54 | { | |
55 | return (reg >= MAX77802_REG_DEVICE_ID && reg < MAX77802_REG_PMIC_END); | |
56 | } | |
57 | ||
58 | static bool max77802_rtc_is_accessible_reg(struct device *dev, | |
59 | unsigned int reg) | |
60 | { | |
61 | return (reg >= MAX77802_RTC_INT && reg < MAX77802_RTC_END); | |
62 | } | |
63 | ||
64 | static bool max77802_is_accessible_reg(struct device *dev, unsigned int reg) | |
65 | { | |
66 | return (max77802_pmic_is_accessible_reg(dev, reg) || | |
67 | max77802_rtc_is_accessible_reg(dev, reg)); | |
68 | } | |
69 | ||
70 | static bool max77802_pmic_is_precious_reg(struct device *dev, unsigned int reg) | |
71 | { | |
72 | return (reg == MAX77802_REG_INTSRC || reg == MAX77802_REG_INT1 || | |
73 | reg == MAX77802_REG_INT2); | |
74 | } | |
75 | ||
76 | static bool max77802_rtc_is_precious_reg(struct device *dev, unsigned int reg) | |
77 | { | |
78 | return (reg == MAX77802_RTC_INT || | |
79 | reg == MAX77802_RTC_UPDATE0 || | |
80 | reg == MAX77802_RTC_UPDATE1); | |
81 | } | |
82 | ||
83 | static bool max77802_is_precious_reg(struct device *dev, unsigned int reg) | |
84 | { | |
85 | return (max77802_pmic_is_precious_reg(dev, reg) || | |
86 | max77802_rtc_is_precious_reg(dev, reg)); | |
87 | } | |
88 | ||
89 | static bool max77802_pmic_is_volatile_reg(struct device *dev, unsigned int reg) | |
90 | { | |
91 | return (max77802_is_precious_reg(dev, reg) || | |
92 | reg == MAX77802_REG_STATUS1 || reg == MAX77802_REG_STATUS2 || | |
93 | reg == MAX77802_REG_PWRON); | |
94 | } | |
95 | ||
96 | static bool max77802_rtc_is_volatile_reg(struct device *dev, unsigned int reg) | |
97 | { | |
98 | return (max77802_rtc_is_precious_reg(dev, reg) || | |
99 | reg == MAX77802_RTC_SEC || | |
100 | reg == MAX77802_RTC_MIN || | |
101 | reg == MAX77802_RTC_HOUR || | |
102 | reg == MAX77802_RTC_WEEKDAY || | |
103 | reg == MAX77802_RTC_MONTH || | |
104 | reg == MAX77802_RTC_YEAR || | |
105 | reg == MAX77802_RTC_DATE); | |
106 | } | |
107 | ||
108 | static bool max77802_is_volatile_reg(struct device *dev, unsigned int reg) | |
109 | { | |
110 | return (max77802_pmic_is_volatile_reg(dev, reg) || | |
111 | max77802_rtc_is_volatile_reg(dev, reg)); | |
112 | } | |
113 | ||
dae8a969 JL |
114 | static struct regmap_config max77686_regmap_config = { |
115 | .reg_bits = 8, | |
116 | .val_bits = 8, | |
117 | }; | |
118 | ||
6f1c1e71 JMC |
119 | static struct regmap_config max77686_rtc_regmap_config = { |
120 | .reg_bits = 8, | |
121 | .val_bits = 8, | |
122 | }; | |
123 | ||
a259f389 JMC |
124 | static struct regmap_config max77802_regmap_config = { |
125 | .reg_bits = 8, | |
126 | .val_bits = 8, | |
127 | .writeable_reg = max77802_is_accessible_reg, | |
128 | .readable_reg = max77802_is_accessible_reg, | |
129 | .precious_reg = max77802_is_precious_reg, | |
130 | .volatile_reg = max77802_is_volatile_reg, | |
131 | .name = "max77802-pmic", | |
132 | .cache_type = REGCACHE_RBTREE, | |
133 | }; | |
134 | ||
6f1c1e71 JMC |
135 | static const struct regmap_irq max77686_irqs[] = { |
136 | /* INT1 interrupts */ | |
137 | { .reg_offset = 0, .mask = MAX77686_INT1_PWRONF_MSK, }, | |
138 | { .reg_offset = 0, .mask = MAX77686_INT1_PWRONR_MSK, }, | |
139 | { .reg_offset = 0, .mask = MAX77686_INT1_JIGONBF_MSK, }, | |
140 | { .reg_offset = 0, .mask = MAX77686_INT1_JIGONBR_MSK, }, | |
141 | { .reg_offset = 0, .mask = MAX77686_INT1_ACOKBF_MSK, }, | |
142 | { .reg_offset = 0, .mask = MAX77686_INT1_ACOKBR_MSK, }, | |
143 | { .reg_offset = 0, .mask = MAX77686_INT1_ONKEY1S_MSK, }, | |
144 | { .reg_offset = 0, .mask = MAX77686_INT1_MRSTB_MSK, }, | |
145 | /* INT2 interrupts */ | |
146 | { .reg_offset = 1, .mask = MAX77686_INT2_140C_MSK, }, | |
147 | { .reg_offset = 1, .mask = MAX77686_INT2_120C_MSK, }, | |
148 | }; | |
149 | ||
150 | static const struct regmap_irq_chip max77686_irq_chip = { | |
151 | .name = "max77686-pmic", | |
152 | .status_base = MAX77686_REG_INT1, | |
153 | .mask_base = MAX77686_REG_INT1MSK, | |
154 | .num_regs = 2, | |
155 | .irqs = max77686_irqs, | |
156 | .num_irqs = ARRAY_SIZE(max77686_irqs), | |
157 | }; | |
158 | ||
159 | static const struct regmap_irq max77686_rtc_irqs[] = { | |
160 | /* RTC interrupts */ | |
161 | { .reg_offset = 0, .mask = MAX77686_RTCINT_RTC60S_MSK, }, | |
162 | { .reg_offset = 0, .mask = MAX77686_RTCINT_RTCA1_MSK, }, | |
163 | { .reg_offset = 0, .mask = MAX77686_RTCINT_RTCA2_MSK, }, | |
164 | { .reg_offset = 0, .mask = MAX77686_RTCINT_SMPL_MSK, }, | |
165 | { .reg_offset = 0, .mask = MAX77686_RTCINT_RTC1S_MSK, }, | |
166 | { .reg_offset = 0, .mask = MAX77686_RTCINT_WTSR_MSK, }, | |
167 | }; | |
168 | ||
169 | static const struct regmap_irq_chip max77686_rtc_irq_chip = { | |
170 | .name = "max77686-rtc", | |
171 | .status_base = MAX77686_RTC_INT, | |
172 | .mask_base = MAX77686_RTC_INTM, | |
173 | .num_regs = 1, | |
174 | .irqs = max77686_rtc_irqs, | |
175 | .num_irqs = ARRAY_SIZE(max77686_rtc_irqs), | |
176 | }; | |
177 | ||
a259f389 JMC |
178 | static const struct regmap_irq_chip max77802_irq_chip = { |
179 | .name = "max77802-pmic", | |
180 | .status_base = MAX77802_REG_INT1, | |
181 | .mask_base = MAX77802_REG_INT1MSK, | |
182 | .num_regs = 2, | |
183 | .irqs = max77686_irqs, /* same masks as 77686 */ | |
184 | .num_irqs = ARRAY_SIZE(max77686_irqs), | |
185 | }; | |
186 | ||
187 | static const struct regmap_irq_chip max77802_rtc_irq_chip = { | |
188 | .name = "max77802-rtc", | |
189 | .status_base = MAX77802_RTC_INT, | |
190 | .mask_base = MAX77802_RTC_INTM, | |
191 | .num_regs = 1, | |
192 | .irqs = max77686_rtc_irqs, /* same masks as 77686 */ | |
193 | .num_irqs = ARRAY_SIZE(max77686_rtc_irqs), | |
194 | }; | |
195 | ||
b68ece3d | 196 | static const struct of_device_id max77686_pmic_dt_match[] = { |
a259f389 JMC |
197 | { |
198 | .compatible = "maxim,max77686", | |
199 | .data = (void *)TYPE_MAX77686, | |
200 | }, | |
201 | { | |
202 | .compatible = "maxim,max77802", | |
203 | .data = (void *)TYPE_MAX77802, | |
204 | }, | |
205 | { }, | |
2984fc00 AL |
206 | }; |
207 | ||
c1516f84 YSB |
208 | static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device |
209 | *dev) | |
210 | { | |
211 | struct max77686_platform_data *pd; | |
212 | ||
213 | pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL); | |
8a789b64 | 214 | if (!pd) |
c1516f84 | 215 | return NULL; |
c1516f84 YSB |
216 | |
217 | dev->platform_data = pd; | |
218 | return pd; | |
219 | } | |
c1516f84 | 220 | |
dae8a969 JL |
221 | static int max77686_i2c_probe(struct i2c_client *i2c, |
222 | const struct i2c_device_id *id) | |
223 | { | |
c1516f84 | 224 | struct max77686_dev *max77686 = NULL; |
334a41ce | 225 | struct max77686_platform_data *pdata = dev_get_platdata(&i2c->dev); |
a259f389 | 226 | const struct of_device_id *match; |
dae8a969 JL |
227 | unsigned int data; |
228 | int ret = 0; | |
a259f389 JMC |
229 | const struct regmap_config *config; |
230 | const struct regmap_irq_chip *irq_chip; | |
231 | const struct regmap_irq_chip *rtc_irq_chip; | |
232 | struct regmap **rtc_regmap; | |
233 | const struct mfd_cell *cells; | |
234 | int n_devs; | |
dae8a969 | 235 | |
ede04c61 | 236 | if (IS_ENABLED(CONFIG_OF) && i2c->dev.of_node && !pdata) |
c1516f84 YSB |
237 | pdata = max77686_i2c_parse_dt_pdata(&i2c->dev); |
238 | ||
239 | if (!pdata) { | |
c1516f84 | 240 | dev_err(&i2c->dev, "No platform data found.\n"); |
b452d7b6 | 241 | return -EINVAL; |
c1516f84 YSB |
242 | } |
243 | ||
742413a4 LJ |
244 | max77686 = devm_kzalloc(&i2c->dev, |
245 | sizeof(struct max77686_dev), GFP_KERNEL); | |
c0e0fcda | 246 | if (!max77686) |
dae8a969 JL |
247 | return -ENOMEM; |
248 | ||
a259f389 JMC |
249 | if (i2c->dev.of_node) { |
250 | match = of_match_node(max77686_pmic_dt_match, i2c->dev.of_node); | |
251 | if (!match) | |
252 | return -EINVAL; | |
253 | ||
254 | max77686->type = (int)match->data; | |
255 | } else { | |
256 | max77686->type = id->driver_data; | |
257 | } | |
258 | ||
dae8a969 JL |
259 | i2c_set_clientdata(i2c, max77686); |
260 | max77686->dev = &i2c->dev; | |
261 | max77686->i2c = i2c; | |
dae8a969 | 262 | |
dae8a969 | 263 | max77686->wakeup = pdata->wakeup; |
2b40459b | 264 | max77686->irq = i2c->irq; |
dae8a969 | 265 | |
a259f389 JMC |
266 | if (max77686->type == TYPE_MAX77686) { |
267 | config = &max77686_regmap_config; | |
268 | irq_chip = &max77686_irq_chip; | |
269 | rtc_irq_chip = &max77686_rtc_irq_chip; | |
270 | rtc_regmap = &max77686->rtc_regmap; | |
271 | cells = max77686_devs; | |
272 | n_devs = ARRAY_SIZE(max77686_devs); | |
273 | } else { | |
274 | config = &max77802_regmap_config; | |
275 | irq_chip = &max77802_irq_chip; | |
276 | rtc_irq_chip = &max77802_rtc_irq_chip; | |
277 | rtc_regmap = &max77686->regmap; | |
278 | cells = max77802_devs; | |
279 | n_devs = ARRAY_SIZE(max77802_devs); | |
280 | } | |
281 | ||
282 | max77686->regmap = devm_regmap_init_i2c(i2c, config); | |
136d982e AL |
283 | if (IS_ERR(max77686->regmap)) { |
284 | ret = PTR_ERR(max77686->regmap); | |
285 | dev_err(max77686->dev, "Failed to allocate register map: %d\n", | |
286 | ret); | |
136d982e AL |
287 | return ret; |
288 | } | |
289 | ||
c0e0fcda JMC |
290 | ret = regmap_read(max77686->regmap, MAX77686_REG_DEVICE_ID, &data); |
291 | if (ret < 0) { | |
dae8a969 JL |
292 | dev_err(max77686->dev, |
293 | "device not found on this channel (this is not an error)\n"); | |
742413a4 | 294 | return -ENODEV; |
6f1c1e71 | 295 | } |
dae8a969 | 296 | |
a259f389 JMC |
297 | if (max77686->type == TYPE_MAX77686) { |
298 | max77686->rtc = i2c_new_dummy(i2c->adapter, I2C_ADDR_RTC); | |
299 | if (!max77686->rtc) { | |
300 | dev_err(max77686->dev, | |
301 | "Failed to allocate I2C device for RTC\n"); | |
302 | return -ENODEV; | |
303 | } | |
304 | i2c_set_clientdata(max77686->rtc, max77686); | |
305 | ||
306 | max77686->rtc_regmap = | |
307 | devm_regmap_init_i2c(max77686->rtc, | |
308 | &max77686_rtc_regmap_config); | |
309 | if (IS_ERR(max77686->rtc_regmap)) { | |
310 | ret = PTR_ERR(max77686->rtc_regmap); | |
311 | dev_err(max77686->dev, | |
312 | "failed to allocate RTC regmap: %d\n", | |
313 | ret); | |
314 | goto err_unregister_i2c; | |
315 | } | |
6f1c1e71 JMC |
316 | } |
317 | ||
318 | ret = regmap_add_irq_chip(max77686->regmap, max77686->irq, | |
319 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT | | |
a259f389 | 320 | IRQF_SHARED, 0, irq_chip, |
6f1c1e71 | 321 | &max77686->irq_data); |
c0e0fcda | 322 | if (ret) { |
6f1c1e71 JMC |
323 | dev_err(&i2c->dev, "failed to add PMIC irq chip: %d\n", ret); |
324 | goto err_unregister_i2c; | |
325 | } | |
a259f389 JMC |
326 | |
327 | ret = regmap_add_irq_chip(*rtc_regmap, max77686->irq, | |
6f1c1e71 | 328 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT | |
a259f389 | 329 | IRQF_SHARED, 0, rtc_irq_chip, |
6f1c1e71 | 330 | &max77686->rtc_irq_data); |
c0e0fcda | 331 | if (ret) { |
6f1c1e71 JMC |
332 | dev_err(&i2c->dev, "failed to add RTC irq chip: %d\n", ret); |
333 | goto err_del_irqc; | |
334 | } | |
dae8a969 | 335 | |
a259f389 | 336 | ret = mfd_add_devices(max77686->dev, -1, cells, n_devs, NULL, 0, NULL); |
742413a4 | 337 | if (ret < 0) { |
6f1c1e71 JMC |
338 | dev_err(&i2c->dev, "failed to add MFD devices: %d\n", ret); |
339 | goto err_del_rtc_irqc; | |
742413a4 | 340 | } |
dae8a969 | 341 | |
6f1c1e71 JMC |
342 | return 0; |
343 | ||
344 | err_del_rtc_irqc: | |
345 | regmap_del_irq_chip(max77686->irq, max77686->rtc_irq_data); | |
346 | err_del_irqc: | |
347 | regmap_del_irq_chip(max77686->irq, max77686->irq_data); | |
348 | err_unregister_i2c: | |
a259f389 JMC |
349 | if (max77686->type == TYPE_MAX77686) |
350 | i2c_unregister_device(max77686->rtc); | |
6f1c1e71 | 351 | |
dae8a969 JL |
352 | return ret; |
353 | } | |
354 | ||
355 | static int max77686_i2c_remove(struct i2c_client *i2c) | |
356 | { | |
357 | struct max77686_dev *max77686 = i2c_get_clientdata(i2c); | |
358 | ||
359 | mfd_remove_devices(max77686->dev); | |
6f1c1e71 JMC |
360 | |
361 | regmap_del_irq_chip(max77686->irq, max77686->rtc_irq_data); | |
362 | regmap_del_irq_chip(max77686->irq, max77686->irq_data); | |
363 | ||
a259f389 JMC |
364 | if (max77686->type == TYPE_MAX77686) |
365 | i2c_unregister_device(max77686->rtc); | |
dae8a969 JL |
366 | |
367 | return 0; | |
368 | } | |
369 | ||
370 | static const struct i2c_device_id max77686_i2c_id[] = { | |
371 | { "max77686", TYPE_MAX77686 }, | |
372 | { } | |
373 | }; | |
374 | MODULE_DEVICE_TABLE(i2c, max77686_i2c_id); | |
375 | ||
2b52b5d5 JMC |
376 | #ifdef CONFIG_PM_SLEEP |
377 | static int max77686_suspend(struct device *dev) | |
378 | { | |
379 | struct i2c_client *i2c = container_of(dev, struct i2c_client, dev); | |
380 | struct max77686_dev *max77686 = i2c_get_clientdata(i2c); | |
381 | ||
382 | if (device_may_wakeup(dev)) | |
383 | enable_irq_wake(max77686->irq); | |
384 | ||
385 | /* | |
386 | * IRQ must be disabled during suspend because if it happens | |
387 | * while suspended it will be handled before resuming I2C. | |
388 | * | |
389 | * When device is woken up from suspend (e.g. by RTC wake alarm), | |
390 | * an interrupt occurs before resuming I2C bus controller. | |
391 | * Interrupt handler tries to read registers but this read | |
392 | * will fail because I2C is still suspended. | |
393 | */ | |
394 | disable_irq(max77686->irq); | |
395 | ||
396 | return 0; | |
397 | } | |
398 | ||
399 | static int max77686_resume(struct device *dev) | |
400 | { | |
401 | struct i2c_client *i2c = container_of(dev, struct i2c_client, dev); | |
402 | struct max77686_dev *max77686 = i2c_get_clientdata(i2c); | |
403 | ||
404 | if (device_may_wakeup(dev)) | |
405 | disable_irq_wake(max77686->irq); | |
406 | ||
407 | enable_irq(max77686->irq); | |
408 | ||
409 | return 0; | |
410 | } | |
411 | #endif /* CONFIG_PM_SLEEP */ | |
412 | ||
413 | static SIMPLE_DEV_PM_OPS(max77686_pm, max77686_suspend, max77686_resume); | |
414 | ||
dae8a969 JL |
415 | static struct i2c_driver max77686_i2c_driver = { |
416 | .driver = { | |
417 | .name = "max77686", | |
418 | .owner = THIS_MODULE, | |
2b52b5d5 | 419 | .pm = &max77686_pm, |
c1516f84 | 420 | .of_match_table = of_match_ptr(max77686_pmic_dt_match), |
dae8a969 JL |
421 | }, |
422 | .probe = max77686_i2c_probe, | |
423 | .remove = max77686_i2c_remove, | |
424 | .id_table = max77686_i2c_id, | |
425 | }; | |
426 | ||
427 | static int __init max77686_i2c_init(void) | |
428 | { | |
429 | return i2c_add_driver(&max77686_i2c_driver); | |
430 | } | |
431 | /* init early so consumer devices can complete system boot */ | |
432 | subsys_initcall(max77686_i2c_init); | |
433 | ||
434 | static void __exit max77686_i2c_exit(void) | |
435 | { | |
436 | i2c_del_driver(&max77686_i2c_driver); | |
437 | } | |
438 | module_exit(max77686_i2c_exit); | |
439 | ||
a259f389 | 440 | MODULE_DESCRIPTION("MAXIM 77686/802 multi-function core driver"); |
dae8a969 JL |
441 | MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>"); |
442 | MODULE_LICENSE("GPL"); |