1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // max14577.c - mfd core driver for the Maxim 14577/77836
4 //
5 // Copyright (C) 2014 Samsung Electronics
6 // Chanwoo Choi <cw00.choi@samsung.com>
7 // Krzysztof Kozlowski <krzk@kernel.org>
8 //
9 // This driver is based on max8997.c
10
11 #include <linux/err.h>
12 #include <linux/module.h>
13 #include <linux/interrupt.h>
14 #include <linux/of_device.h>
15 #include <linux/mfd/core.h>
16 #include <linux/mfd/max14577.h>
17 #include <linux/mfd/max14577-private.h>
18
19 /*
20 * Table of valid charger currents for different Maxim chipsets.
21 * It is placed here because it is used by both charger and regulator driver.
22 */
23 const struct maxim_charger_current maxim_charger_currents[] = {
24 [MAXIM_DEVICE_TYPE_UNKNOWN] = { 0, 0, 0, 0 },
25 [MAXIM_DEVICE_TYPE_MAX14577] = {
26 .min = MAX14577_CHARGER_CURRENT_LIMIT_MIN,
27 .high_start = MAX14577_CHARGER_CURRENT_LIMIT_HIGH_START,
28 .high_step = MAX14577_CHARGER_CURRENT_LIMIT_HIGH_STEP,
29 .max = MAX14577_CHARGER_CURRENT_LIMIT_MAX,
30 },
31 [MAXIM_DEVICE_TYPE_MAX77836] = {
32 .min = MAX77836_CHARGER_CURRENT_LIMIT_MIN,
33 .high_start = MAX77836_CHARGER_CURRENT_LIMIT_HIGH_START,
34 .high_step = MAX77836_CHARGER_CURRENT_LIMIT_HIGH_STEP,
35 .max = MAX77836_CHARGER_CURRENT_LIMIT_MAX,
36 },
37 };
38 EXPORT_SYMBOL_GPL(maxim_charger_currents);
39
40 /*
41 * maxim_charger_calc_reg_current - Calculate register value for current
42 * @limits: constraints for charger, matching the MBCICHWRC register
43 * @min_ua: minimal requested current, micro Amps
44 * @max_ua: maximum requested current, micro Amps
45 * @dst: destination to store calculated register value
46 *
47 * Calculates the value of MBCICHWRC (Fast Battery Charge Current) register
48 * for given current and stores it under pointed 'dst'. The stored value
49 * combines low bit (MBCICHWRCL) and high bits (MBCICHWRCH). It is also
50 * properly shifted.
51 *
52 * The calculated register value matches the current which:
53 * - is always between <limits.min, limits.max>;
54 * - is always less or equal to max_ua;
55 * - is the highest possible value;
56 * - may be lower than min_ua.
57 *
58 * On success returns 0. On error returns -EINVAL (requested min/max current
59 * is outside of given charger limits) and 'dst' is not set.
60 */
maxim_charger_calc_reg_current(const struct maxim_charger_current * limits,unsigned int min_ua,unsigned int max_ua,u8 * dst)61 int maxim_charger_calc_reg_current(const struct maxim_charger_current *limits,
62 unsigned int min_ua, unsigned int max_ua, u8 *dst)
63 {
64 unsigned int current_bits;
65
66 if (min_ua > max_ua)
67 return -EINVAL;
68
69 if (min_ua > limits->max || max_ua < limits->min)
70 return -EINVAL;
71
72 if (max_ua < limits->high_start) {
73 /*
74 * Less than high_start, so set the minimal current
75 * (turn Low Bit off, 0 as high bits).
76 */
77 *dst = 0x0;
78 return 0;
79 }
80
81 /* max_ua is in range: <high_start, infinite>, cut it to limits.max */
82 max_ua = min(limits->max, max_ua);
83 max_ua -= limits->high_start;
84 /*
85 * There is no risk of overflow 'max_ua' here because:
86 * - max_ua >= limits.high_start
87 * - BUILD_BUG checks that 'limits' are: max >= high_start + high_step
88 */
89 current_bits = max_ua / limits->high_step;
90
91 /* Turn Low Bit on (use range <limits.high_start, limits.max>) ... */
92 *dst = 0x1 << CHGCTRL4_MBCICHWRCL_SHIFT;
93 /* and set proper High Bits */
94 *dst |= current_bits << CHGCTRL4_MBCICHWRCH_SHIFT;
95
96 return 0;
97 }
98 EXPORT_SYMBOL_GPL(maxim_charger_calc_reg_current);
99
100 static const struct mfd_cell max14577_devs[] = {
101 {
102 .name = "max14577-muic",
103 .of_compatible = "maxim,max14577-muic",
104 },
105 {
106 .name = "max14577-regulator",
107 .of_compatible = "maxim,max14577-regulator",
108 },
109 {
110 .name = "max14577-charger",
111 .of_compatible = "maxim,max14577-charger",
112 },
113 };
114
115 static const struct mfd_cell max77836_devs[] = {
116 {
117 .name = "max77836-muic",
118 .of_compatible = "maxim,max77836-muic",
119 },
120 {
121 .name = "max77836-regulator",
122 .of_compatible = "maxim,max77836-regulator",
123 },
124 {
125 .name = "max77836-charger",
126 .of_compatible = "maxim,max77836-charger",
127 },
128 {
129 .name = "max77836-battery",
130 .of_compatible = "maxim,max77836-battery",
131 },
132 };
133
134 static const struct of_device_id max14577_dt_match[] = {
135 {
136 .compatible = "maxim,max14577",
137 .data = (void *)MAXIM_DEVICE_TYPE_MAX14577,
138 },
139 {
140 .compatible = "maxim,max77836",
141 .data = (void *)MAXIM_DEVICE_TYPE_MAX77836,
142 },
143 {},
144 };
145
max14577_muic_volatile_reg(struct device * dev,unsigned int reg)146 static bool max14577_muic_volatile_reg(struct device *dev, unsigned int reg)
147 {
148 switch (reg) {
149 case MAX14577_REG_INT1 ... MAX14577_REG_STATUS3:
150 return true;
151 default:
152 break;
153 }
154 return false;
155 }
156
max77836_muic_volatile_reg(struct device * dev,unsigned int reg)157 static bool max77836_muic_volatile_reg(struct device *dev, unsigned int reg)
158 {
159 /* Any max14577 volatile registers are also max77836 volatile. */
160 if (max14577_muic_volatile_reg(dev, reg))
161 return true;
162
163 switch (reg) {
164 case MAX77836_FG_REG_VCELL_MSB ... MAX77836_FG_REG_SOC_LSB:
165 case MAX77836_FG_REG_CRATE_MSB ... MAX77836_FG_REG_CRATE_LSB:
166 case MAX77836_FG_REG_STATUS_H ... MAX77836_FG_REG_STATUS_L:
167 case MAX77836_PMIC_REG_INTSRC:
168 case MAX77836_PMIC_REG_TOPSYS_INT:
169 case MAX77836_PMIC_REG_TOPSYS_STAT:
170 return true;
171 default:
172 break;
173 }
174 return false;
175 }
176
177 static const struct regmap_config max14577_muic_regmap_config = {
178 .reg_bits = 8,
179 .val_bits = 8,
180 .volatile_reg = max14577_muic_volatile_reg,
181 .max_register = MAX14577_REG_END,
182 };
183
184 static const struct regmap_config max77836_pmic_regmap_config = {
185 .reg_bits = 8,
186 .val_bits = 8,
187 .volatile_reg = max77836_muic_volatile_reg,
188 .max_register = MAX77836_PMIC_REG_END,
189 };
190
191 static const struct regmap_irq max14577_irqs[] = {
192 /* INT1 interrupts */
193 { .reg_offset = 0, .mask = MAX14577_INT1_ADC_MASK, },
194 { .reg_offset = 0, .mask = MAX14577_INT1_ADCLOW_MASK, },
195 { .reg_offset = 0, .mask = MAX14577_INT1_ADCERR_MASK, },
196 /* INT2 interrupts */
197 { .reg_offset = 1, .mask = MAX14577_INT2_CHGTYP_MASK, },
198 { .reg_offset = 1, .mask = MAX14577_INT2_CHGDETRUN_MASK, },
199 { .reg_offset = 1, .mask = MAX14577_INT2_DCDTMR_MASK, },
200 { .reg_offset = 1, .mask = MAX14577_INT2_DBCHG_MASK, },
201 { .reg_offset = 1, .mask = MAX14577_INT2_VBVOLT_MASK, },
202 /* INT3 interrupts */
203 { .reg_offset = 2, .mask = MAX14577_INT3_EOC_MASK, },
204 { .reg_offset = 2, .mask = MAX14577_INT3_CGMBC_MASK, },
205 { .reg_offset = 2, .mask = MAX14577_INT3_OVP_MASK, },
206 { .reg_offset = 2, .mask = MAX14577_INT3_MBCCHGERR_MASK, },
207 };
208
209 static const struct regmap_irq_chip max14577_irq_chip = {
210 .name = "max14577",
211 .status_base = MAX14577_REG_INT1,
212 .mask_base = MAX14577_REG_INTMASK1,
213 .mask_invert = true,
214 .num_regs = 3,
215 .irqs = max14577_irqs,
216 .num_irqs = ARRAY_SIZE(max14577_irqs),
217 };
218
219 static const struct regmap_irq max77836_muic_irqs[] = {
220 /* INT1 interrupts */
221 { .reg_offset = 0, .mask = MAX14577_INT1_ADC_MASK, },
222 { .reg_offset = 0, .mask = MAX14577_INT1_ADCLOW_MASK, },
223 { .reg_offset = 0, .mask = MAX14577_INT1_ADCERR_MASK, },
224 { .reg_offset = 0, .mask = MAX77836_INT1_ADC1K_MASK, },
225 /* INT2 interrupts */
226 { .reg_offset = 1, .mask = MAX14577_INT2_CHGTYP_MASK, },
227 { .reg_offset = 1, .mask = MAX14577_INT2_CHGDETRUN_MASK, },
228 { .reg_offset = 1, .mask = MAX14577_INT2_DCDTMR_MASK, },
229 { .reg_offset = 1, .mask = MAX14577_INT2_DBCHG_MASK, },
230 { .reg_offset = 1, .mask = MAX14577_INT2_VBVOLT_MASK, },
231 { .reg_offset = 1, .mask = MAX77836_INT2_VIDRM_MASK, },
232 /* INT3 interrupts */
233 { .reg_offset = 2, .mask = MAX14577_INT3_EOC_MASK, },
234 { .reg_offset = 2, .mask = MAX14577_INT3_CGMBC_MASK, },
235 { .reg_offset = 2, .mask = MAX14577_INT3_OVP_MASK, },
236 { .reg_offset = 2, .mask = MAX14577_INT3_MBCCHGERR_MASK, },
237 };
238
239 static const struct regmap_irq_chip max77836_muic_irq_chip = {
240 .name = "max77836-muic",
241 .status_base = MAX14577_REG_INT1,
242 .mask_base = MAX14577_REG_INTMASK1,
243 .mask_invert = true,
244 .num_regs = 3,
245 .irqs = max77836_muic_irqs,
246 .num_irqs = ARRAY_SIZE(max77836_muic_irqs),
247 };
248
249 static const struct regmap_irq max77836_pmic_irqs[] = {
250 { .reg_offset = 0, .mask = MAX77836_TOPSYS_INT_T120C_MASK, },
251 { .reg_offset = 0, .mask = MAX77836_TOPSYS_INT_T140C_MASK, },
252 };
253
254 static const struct regmap_irq_chip max77836_pmic_irq_chip = {
255 .name = "max77836-pmic",
256 .status_base = MAX77836_PMIC_REG_TOPSYS_INT,
257 .mask_base = MAX77836_PMIC_REG_TOPSYS_INT_MASK,
258 .mask_invert = false,
259 .num_regs = 1,
260 .irqs = max77836_pmic_irqs,
261 .num_irqs = ARRAY_SIZE(max77836_pmic_irqs),
262 };
263
max14577_print_dev_type(struct max14577 * max14577)264 static void max14577_print_dev_type(struct max14577 *max14577)
265 {
266 u8 reg_data, vendor_id, device_id;
267 int ret;
268
269 ret = max14577_read_reg(max14577->regmap, MAX14577_REG_DEVICEID,
270 ®_data);
271 if (ret) {
272 dev_err(max14577->dev,
273 "Failed to read DEVICEID register: %d\n", ret);
274 return;
275 }
276
277 vendor_id = ((reg_data & DEVID_VENDORID_MASK) >>
278 DEVID_VENDORID_SHIFT);
279 device_id = ((reg_data & DEVID_DEVICEID_MASK) >>
280 DEVID_DEVICEID_SHIFT);
281
282 dev_info(max14577->dev, "Device type: %u (ID: 0x%x, vendor: 0x%x)\n",
283 max14577->dev_type, device_id, vendor_id);
284 }
285
286 /*
287 * Max77836 specific initialization code for driver probe.
288 * Adds new I2C dummy device, regmap and regmap IRQ chip.
289 * Unmasks Interrupt Source register.
290 *
291 * On success returns 0.
292 * On failure returns errno and reverts any changes done so far (e.g. remove
293 * I2C dummy device), except masking the INT SRC register.
294 */
max77836_init(struct max14577 * max14577)295 static int max77836_init(struct max14577 *max14577)
296 {
297 int ret;
298 u8 intsrc_mask;
299
300 max14577->i2c_pmic = i2c_new_dummy_device(max14577->i2c->adapter,
301 I2C_ADDR_PMIC);
302 if (IS_ERR(max14577->i2c_pmic)) {
303 dev_err(max14577->dev, "Failed to register PMIC I2C device\n");
304 return PTR_ERR(max14577->i2c_pmic);
305 }
306 i2c_set_clientdata(max14577->i2c_pmic, max14577);
307
308 max14577->regmap_pmic = devm_regmap_init_i2c(max14577->i2c_pmic,
309 &max77836_pmic_regmap_config);
310 if (IS_ERR(max14577->regmap_pmic)) {
311 ret = PTR_ERR(max14577->regmap_pmic);
312 dev_err(max14577->dev, "Failed to allocate PMIC register map: %d\n",
313 ret);
314 goto err;
315 }
316
317 /* Un-mask MAX77836 Interrupt Source register */
318 ret = max14577_read_reg(max14577->regmap_pmic,
319 MAX77836_PMIC_REG_INTSRC_MASK, &intsrc_mask);
320 if (ret < 0) {
321 dev_err(max14577->dev, "Failed to read PMIC register\n");
322 goto err;
323 }
324
325 intsrc_mask &= ~(MAX77836_INTSRC_MASK_TOP_INT_MASK);
326 intsrc_mask &= ~(MAX77836_INTSRC_MASK_MUIC_CHG_INT_MASK);
327 ret = max14577_write_reg(max14577->regmap_pmic,
328 MAX77836_PMIC_REG_INTSRC_MASK, intsrc_mask);
329 if (ret < 0) {
330 dev_err(max14577->dev, "Failed to write PMIC register\n");
331 goto err;
332 }
333
334 ret = regmap_add_irq_chip(max14577->regmap_pmic, max14577->irq,
335 IRQF_TRIGGER_FALLING | IRQF_ONESHOT | IRQF_SHARED,
336 0, &max77836_pmic_irq_chip,
337 &max14577->irq_data_pmic);
338 if (ret != 0) {
339 dev_err(max14577->dev, "Failed to request PMIC IRQ %d: %d\n",
340 max14577->irq, ret);
341 goto err;
342 }
343
344 return 0;
345
346 err:
347 i2c_unregister_device(max14577->i2c_pmic);
348
349 return ret;
350 }
351
352 /*
353 * Max77836 specific de-initialization code for driver remove.
354 */
max77836_remove(struct max14577 * max14577)355 static void max77836_remove(struct max14577 *max14577)
356 {
357 regmap_del_irq_chip(max14577->irq, max14577->irq_data_pmic);
358 i2c_unregister_device(max14577->i2c_pmic);
359 }
360
max14577_i2c_probe(struct i2c_client * i2c,const struct i2c_device_id * id)361 static int max14577_i2c_probe(struct i2c_client *i2c,
362 const struct i2c_device_id *id)
363 {
364 struct max14577 *max14577;
365 struct max14577_platform_data *pdata = dev_get_platdata(&i2c->dev);
366 struct device_node *np = i2c->dev.of_node;
367 int ret = 0;
368 const struct regmap_irq_chip *irq_chip;
369 const struct mfd_cell *mfd_devs;
370 unsigned int mfd_devs_size;
371 int irq_flags;
372
373 if (np) {
374 pdata = devm_kzalloc(&i2c->dev, sizeof(*pdata), GFP_KERNEL);
375 if (!pdata)
376 return -ENOMEM;
377 i2c->dev.platform_data = pdata;
378 }
379
380 if (!pdata) {
381 dev_err(&i2c->dev, "No platform data found.\n");
382 return -EINVAL;
383 }
384
385 max14577 = devm_kzalloc(&i2c->dev, sizeof(*max14577), GFP_KERNEL);
386 if (!max14577)
387 return -ENOMEM;
388
389 i2c_set_clientdata(i2c, max14577);
390 max14577->dev = &i2c->dev;
391 max14577->i2c = i2c;
392 max14577->irq = i2c->irq;
393
394 max14577->regmap = devm_regmap_init_i2c(i2c,
395 &max14577_muic_regmap_config);
396 if (IS_ERR(max14577->regmap)) {
397 ret = PTR_ERR(max14577->regmap);
398 dev_err(max14577->dev, "Failed to allocate register map: %d\n",
399 ret);
400 return ret;
401 }
402
403 if (np) {
404 const struct of_device_id *of_id;
405
406 of_id = of_match_device(max14577_dt_match, &i2c->dev);
407 if (of_id)
408 max14577->dev_type =
409 (enum maxim_device_type)of_id->data;
410 } else {
411 max14577->dev_type = id->driver_data;
412 }
413
414 max14577_print_dev_type(max14577);
415
416 switch (max14577->dev_type) {
417 case MAXIM_DEVICE_TYPE_MAX77836:
418 irq_chip = &max77836_muic_irq_chip;
419 mfd_devs = max77836_devs;
420 mfd_devs_size = ARRAY_SIZE(max77836_devs);
421 irq_flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT | IRQF_SHARED;
422 break;
423 case MAXIM_DEVICE_TYPE_MAX14577:
424 default:
425 irq_chip = &max14577_irq_chip;
426 mfd_devs = max14577_devs;
427 mfd_devs_size = ARRAY_SIZE(max14577_devs);
428 irq_flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT;
429 break;
430 }
431
432 ret = regmap_add_irq_chip(max14577->regmap, max14577->irq,
433 irq_flags, 0, irq_chip,
434 &max14577->irq_data);
435 if (ret != 0) {
436 dev_err(&i2c->dev, "Failed to request IRQ %d: %d\n",
437 max14577->irq, ret);
438 return ret;
439 }
440
441 /* Max77836 specific initialization code (additional regmap) */
442 if (max14577->dev_type == MAXIM_DEVICE_TYPE_MAX77836) {
443 ret = max77836_init(max14577);
444 if (ret < 0)
445 goto err_max77836;
446 }
447
448 ret = mfd_add_devices(max14577->dev, -1, mfd_devs,
449 mfd_devs_size, NULL, 0, NULL);
450 if (ret < 0)
451 goto err_mfd;
452
453 device_init_wakeup(max14577->dev, 1);
454
455 return 0;
456
457 err_mfd:
458 if (max14577->dev_type == MAXIM_DEVICE_TYPE_MAX77836)
459 max77836_remove(max14577);
460 err_max77836:
461 regmap_del_irq_chip(max14577->irq, max14577->irq_data);
462
463 return ret;
464 }
465
max14577_i2c_remove(struct i2c_client * i2c)466 static int max14577_i2c_remove(struct i2c_client *i2c)
467 {
468 struct max14577 *max14577 = i2c_get_clientdata(i2c);
469
470 mfd_remove_devices(max14577->dev);
471 regmap_del_irq_chip(max14577->irq, max14577->irq_data);
472 if (max14577->dev_type == MAXIM_DEVICE_TYPE_MAX77836)
473 max77836_remove(max14577);
474
475 return 0;
476 }
477
478 static const struct i2c_device_id max14577_i2c_id[] = {
479 { "max14577", MAXIM_DEVICE_TYPE_MAX14577, },
480 { "max77836", MAXIM_DEVICE_TYPE_MAX77836, },
481 { }
482 };
483 MODULE_DEVICE_TABLE(i2c, max14577_i2c_id);
484
485 #ifdef CONFIG_PM_SLEEP
max14577_suspend(struct device * dev)486 static int max14577_suspend(struct device *dev)
487 {
488 struct i2c_client *i2c = to_i2c_client(dev);
489 struct max14577 *max14577 = i2c_get_clientdata(i2c);
490
491 if (device_may_wakeup(dev))
492 enable_irq_wake(max14577->irq);
493 /*
494 * MUIC IRQ must be disabled during suspend because if it happens
495 * while suspended it will be handled before resuming I2C.
496 *
497 * When device is woken up from suspend (e.g. by ADC change),
498 * an interrupt occurs before resuming I2C bus controller.
499 * Interrupt handler tries to read registers but this read
500 * will fail because I2C is still suspended.
501 */
502 disable_irq(max14577->irq);
503
504 return 0;
505 }
506
max14577_resume(struct device * dev)507 static int max14577_resume(struct device *dev)
508 {
509 struct i2c_client *i2c = to_i2c_client(dev);
510 struct max14577 *max14577 = i2c_get_clientdata(i2c);
511
512 if (device_may_wakeup(dev))
513 disable_irq_wake(max14577->irq);
514 enable_irq(max14577->irq);
515
516 return 0;
517 }
518 #endif /* CONFIG_PM_SLEEP */
519
520 static SIMPLE_DEV_PM_OPS(max14577_pm, max14577_suspend, max14577_resume);
521
522 static struct i2c_driver max14577_i2c_driver = {
523 .driver = {
524 .name = "max14577",
525 .pm = &max14577_pm,
526 .of_match_table = max14577_dt_match,
527 },
528 .probe = max14577_i2c_probe,
529 .remove = max14577_i2c_remove,
530 .id_table = max14577_i2c_id,
531 };
532
max14577_i2c_init(void)533 static int __init max14577_i2c_init(void)
534 {
535 BUILD_BUG_ON(ARRAY_SIZE(max14577_i2c_id) != MAXIM_DEVICE_TYPE_NUM);
536 BUILD_BUG_ON(ARRAY_SIZE(max14577_dt_match) != MAXIM_DEVICE_TYPE_NUM);
537
538 /* Valid charger current values must be provided for each chipset */
539 BUILD_BUG_ON(ARRAY_SIZE(maxim_charger_currents) != MAXIM_DEVICE_TYPE_NUM);
540
541 /* Check for valid values for charger */
542 BUILD_BUG_ON(MAX14577_CHARGER_CURRENT_LIMIT_HIGH_START +
543 MAX14577_CHARGER_CURRENT_LIMIT_HIGH_STEP * 0xf !=
544 MAX14577_CHARGER_CURRENT_LIMIT_MAX);
545 BUILD_BUG_ON(MAX14577_CHARGER_CURRENT_LIMIT_HIGH_STEP == 0);
546
547 BUILD_BUG_ON(MAX77836_CHARGER_CURRENT_LIMIT_HIGH_START +
548 MAX77836_CHARGER_CURRENT_LIMIT_HIGH_STEP * 0xf !=
549 MAX77836_CHARGER_CURRENT_LIMIT_MAX);
550 BUILD_BUG_ON(MAX77836_CHARGER_CURRENT_LIMIT_HIGH_STEP == 0);
551
552 return i2c_add_driver(&max14577_i2c_driver);
553 }
554 module_init(max14577_i2c_init);
555
max14577_i2c_exit(void)556 static void __exit max14577_i2c_exit(void)
557 {
558 i2c_del_driver(&max14577_i2c_driver);
559 }
560 module_exit(max14577_i2c_exit);
561
562 MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>, Krzysztof Kozlowski <krzk@kernel.org>");
563 MODULE_DESCRIPTION("Maxim 14577/77836 multi-function core driver");
564 MODULE_LICENSE("GPL");
565
