1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // da9211-regulator.c - Regulator device driver for DA9211/DA9212
4 // /DA9213/DA9223/DA9214/DA9224/DA9215/DA9225
5 // Copyright (C) 2015  Dialog Semiconductor Ltd.
6 
7 #include <linux/err.h>
8 #include <linux/i2c.h>
9 #include <linux/module.h>
10 #include <linux/init.h>
11 #include <linux/slab.h>
12 #include <linux/regulator/driver.h>
13 #include <linux/regulator/machine.h>
14 #include <linux/regmap.h>
15 #include <linux/irq.h>
16 #include <linux/interrupt.h>
17 #include <linux/gpio/consumer.h>
18 #include <linux/regulator/of_regulator.h>
19 #include <linux/regulator/da9211.h>
20 #include <dt-bindings/regulator/dlg,da9211-regulator.h>
21 #include "da9211-regulator.h"
22 
23 /* DEVICE IDs */
24 #define DA9211_DEVICE_ID	0x22
25 #define DA9213_DEVICE_ID	0x23
26 #define DA9215_DEVICE_ID	0x24
27 
28 /* DA9211 REGULATOR IDs */
29 #define DA9211_ID_BUCKA	0
30 #define DA9211_ID_BUCKB	1
31 
32 struct da9211 {
33 	struct device *dev;
34 	struct regmap *regmap;
35 	struct da9211_pdata *pdata;
36 	struct regulator_dev *rdev[DA9211_MAX_REGULATORS];
37 	int num_regulator;
38 	int chip_irq;
39 	int chip_id;
40 };
41 
42 static const struct regmap_range_cfg da9211_regmap_range[] = {
43 	{
44 		.selector_reg = DA9211_REG_PAGE_CON,
45 		.selector_mask  = DA9211_REG_PAGE_MASK,
46 		.selector_shift = DA9211_REG_PAGE_SHIFT,
47 		.window_start = 0,
48 		.window_len = 256,
49 		.range_min = 0,
50 		.range_max = 5*128,
51 	},
52 };
53 
54 static bool da9211_volatile_reg(struct device *dev, unsigned int reg)
55 {
56 	switch (reg) {
57 	case DA9211_REG_STATUS_A:
58 	case DA9211_REG_STATUS_B:
59 	case DA9211_REG_EVENT_A:
60 	case DA9211_REG_EVENT_B:
61 		return true;
62 	}
63 	return false;
64 }
65 
66 static const struct regmap_config da9211_regmap_config = {
67 	.reg_bits = 8,
68 	.val_bits = 8,
69 	.max_register = 5 * 128,
70 	.volatile_reg = da9211_volatile_reg,
71 	.cache_type = REGCACHE_RBTREE,
72 	.ranges = da9211_regmap_range,
73 	.num_ranges = ARRAY_SIZE(da9211_regmap_range),
74 };
75 
76 /* Default limits measured in millivolts and milliamps */
77 #define DA9211_MIN_MV		300
78 #define DA9211_MAX_MV		1570
79 #define DA9211_STEP_MV		10
80 
81 /* Current limits for DA9211 buck (uA) indices
82  * corresponds with register values
83  */
84 static const int da9211_current_limits[] = {
85 	2000000, 2200000, 2400000, 2600000, 2800000, 3000000, 3200000, 3400000,
86 	3600000, 3800000, 4000000, 4200000, 4400000, 4600000, 4800000, 5000000
87 };
88 /* Current limits for DA9213 buck (uA) indices
89  * corresponds with register values
90  */
91 static const int da9213_current_limits[] = {
92 	3000000, 3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000,
93 	4600000, 4800000, 5000000, 5200000, 5400000, 5600000, 5800000, 6000000
94 };
95 /* Current limits for DA9215 buck (uA) indices
96  * corresponds with register values
97  */
98 static const int da9215_current_limits[] = {
99 	4000000, 4200000, 4400000, 4600000, 4800000, 5000000, 5200000, 5400000,
100 	5600000, 5800000, 6000000, 6200000, 6400000, 6600000, 6800000, 7000000
101 };
102 
103 static unsigned int da9211_map_buck_mode(unsigned int mode)
104 {
105 	switch (mode) {
106 	case DA9211_BUCK_MODE_SLEEP:
107 		return REGULATOR_MODE_STANDBY;
108 	case DA9211_BUCK_MODE_SYNC:
109 		return REGULATOR_MODE_FAST;
110 	case DA9211_BUCK_MODE_AUTO:
111 		return REGULATOR_MODE_NORMAL;
112 	default:
113 		return REGULATOR_MODE_INVALID;
114 	}
115 }
116 
117 static unsigned int da9211_buck_get_mode(struct regulator_dev *rdev)
118 {
119 	int id = rdev_get_id(rdev);
120 	struct da9211 *chip = rdev_get_drvdata(rdev);
121 	unsigned int data;
122 	int ret, mode = 0;
123 
124 	ret = regmap_read(chip->regmap, DA9211_REG_BUCKA_CONF+id, &data);
125 	if (ret < 0)
126 		return ret;
127 
128 	switch (data & 0x03) {
129 	case DA9211_BUCK_MODE_SYNC:
130 		mode = REGULATOR_MODE_FAST;
131 		break;
132 	case DA9211_BUCK_MODE_AUTO:
133 		mode = REGULATOR_MODE_NORMAL;
134 		break;
135 	case DA9211_BUCK_MODE_SLEEP:
136 		mode = REGULATOR_MODE_STANDBY;
137 		break;
138 	}
139 
140 	return mode;
141 }
142 
143 static int da9211_buck_set_mode(struct regulator_dev *rdev,
144 					unsigned int mode)
145 {
146 	int id = rdev_get_id(rdev);
147 	struct da9211 *chip = rdev_get_drvdata(rdev);
148 	int val = 0;
149 
150 	switch (mode) {
151 	case REGULATOR_MODE_FAST:
152 		val = DA9211_BUCK_MODE_SYNC;
153 		break;
154 	case REGULATOR_MODE_NORMAL:
155 		val = DA9211_BUCK_MODE_AUTO;
156 		break;
157 	case REGULATOR_MODE_STANDBY:
158 		val = DA9211_BUCK_MODE_SLEEP;
159 		break;
160 	}
161 
162 	return regmap_update_bits(chip->regmap, DA9211_REG_BUCKA_CONF+id,
163 					0x03, val);
164 }
165 
166 static int da9211_set_current_limit(struct regulator_dev *rdev, int min,
167 				    int max)
168 {
169 	int id = rdev_get_id(rdev);
170 	struct da9211 *chip = rdev_get_drvdata(rdev);
171 	int i, max_size;
172 	const int *current_limits;
173 
174 	switch (chip->chip_id) {
175 	case DA9211:
176 		current_limits = da9211_current_limits;
177 		max_size = ARRAY_SIZE(da9211_current_limits)-1;
178 		break;
179 	case DA9213:
180 		current_limits = da9213_current_limits;
181 		max_size = ARRAY_SIZE(da9213_current_limits)-1;
182 		break;
183 	case DA9215:
184 		current_limits = da9215_current_limits;
185 		max_size = ARRAY_SIZE(da9215_current_limits)-1;
186 		break;
187 	default:
188 		return -EINVAL;
189 	}
190 
191 	/* search for closest to maximum */
192 	for (i = max_size; i >= 0; i--) {
193 		if (min <= current_limits[i] &&
194 		    max >= current_limits[i]) {
195 				return regmap_update_bits(chip->regmap,
196 					DA9211_REG_BUCK_ILIM,
197 					(0x0F << id*4), (i << id*4));
198 		}
199 	}
200 
201 	return -EINVAL;
202 }
203 
204 static int da9211_get_current_limit(struct regulator_dev *rdev)
205 {
206 	int id = rdev_get_id(rdev);
207 	struct da9211 *chip = rdev_get_drvdata(rdev);
208 	unsigned int data;
209 	int ret;
210 	const int *current_limits;
211 
212 	switch (chip->chip_id) {
213 	case DA9211:
214 		current_limits = da9211_current_limits;
215 		break;
216 	case DA9213:
217 		current_limits = da9213_current_limits;
218 		break;
219 	case DA9215:
220 		current_limits = da9215_current_limits;
221 		break;
222 	default:
223 		return -EINVAL;
224 	}
225 
226 	ret = regmap_read(chip->regmap, DA9211_REG_BUCK_ILIM, &data);
227 	if (ret < 0)
228 		return ret;
229 
230 	/* select one of 16 values: 0000 (2000mA or 3000mA)
231 	 * to 1111 (5000mA or 6000mA).
232 	 */
233 	data = (data >> id*4) & 0x0F;
234 	return current_limits[data];
235 }
236 
237 static const struct regulator_ops da9211_buck_ops = {
238 	.get_mode = da9211_buck_get_mode,
239 	.set_mode = da9211_buck_set_mode,
240 	.enable = regulator_enable_regmap,
241 	.disable = regulator_disable_regmap,
242 	.is_enabled = regulator_is_enabled_regmap,
243 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
244 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
245 	.list_voltage = regulator_list_voltage_linear,
246 	.set_current_limit = da9211_set_current_limit,
247 	.get_current_limit = da9211_get_current_limit,
248 };
249 
250 #define DA9211_BUCK(_id) \
251 {\
252 	.name = #_id,\
253 	.ops = &da9211_buck_ops,\
254 	.type = REGULATOR_VOLTAGE,\
255 	.id = DA9211_ID_##_id,\
256 	.n_voltages = (DA9211_MAX_MV - DA9211_MIN_MV) / DA9211_STEP_MV + 1,\
257 	.min_uV = (DA9211_MIN_MV * 1000),\
258 	.uV_step = (DA9211_STEP_MV * 1000),\
259 	.enable_reg = DA9211_REG_BUCKA_CONT + DA9211_ID_##_id,\
260 	.enable_mask = DA9211_BUCKA_EN,\
261 	.vsel_reg = DA9211_REG_VBUCKA_A + DA9211_ID_##_id * 2,\
262 	.vsel_mask = DA9211_VBUCK_MASK,\
263 	.owner = THIS_MODULE,\
264 	.of_map_mode = da9211_map_buck_mode,\
265 }
266 
267 static struct regulator_desc da9211_regulators[] = {
268 	DA9211_BUCK(BUCKA),
269 	DA9211_BUCK(BUCKB),
270 };
271 
272 #ifdef CONFIG_OF
273 static struct of_regulator_match da9211_matches[] = {
274 	[DA9211_ID_BUCKA] = {
275 		.name = "BUCKA",
276 		.desc = &da9211_regulators[DA9211_ID_BUCKA],
277 	},
278 	[DA9211_ID_BUCKB] = {
279 		.name = "BUCKB",
280 		.desc = &da9211_regulators[DA9211_ID_BUCKB],
281 	},
282 	};
283 
284 static struct da9211_pdata *da9211_parse_regulators_dt(
285 		struct device *dev)
286 {
287 	struct da9211_pdata *pdata;
288 	struct device_node *node;
289 	int i, num, n;
290 
291 	node = of_get_child_by_name(dev->of_node, "regulators");
292 	if (!node) {
293 		dev_err(dev, "regulators node not found\n");
294 		return ERR_PTR(-ENODEV);
295 	}
296 
297 	num = of_regulator_match(dev, node, da9211_matches,
298 				 ARRAY_SIZE(da9211_matches));
299 	of_node_put(node);
300 	if (num < 0) {
301 		dev_err(dev, "Failed to match regulators\n");
302 		return ERR_PTR(-EINVAL);
303 	}
304 
305 	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
306 	if (!pdata)
307 		return ERR_PTR(-ENOMEM);
308 
309 	pdata->num_buck = num;
310 
311 	n = 0;
312 	for (i = 0; i < ARRAY_SIZE(da9211_matches); i++) {
313 		if (!da9211_matches[i].init_data)
314 			continue;
315 
316 		pdata->init_data[n] = da9211_matches[i].init_data;
317 		pdata->reg_node[n] = da9211_matches[i].of_node;
318 		pdata->gpiod_ren[n] = devm_fwnode_gpiod_get(dev,
319 					of_fwnode_handle(pdata->reg_node[n]),
320 					"enable",
321 					GPIOD_OUT_HIGH |
322 						GPIOD_FLAGS_BIT_NONEXCLUSIVE,
323 					"da9211-enable");
324 		if (IS_ERR(pdata->gpiod_ren[n]))
325 			pdata->gpiod_ren[n] = NULL;
326 		n++;
327 	}
328 
329 	return pdata;
330 }
331 #else
332 static struct da9211_pdata *da9211_parse_regulators_dt(
333 		struct device *dev)
334 {
335 	return ERR_PTR(-ENODEV);
336 }
337 #endif
338 
339 static irqreturn_t da9211_irq_handler(int irq, void *data)
340 {
341 	struct da9211 *chip = data;
342 	int reg_val, err, ret = IRQ_NONE;
343 
344 	err = regmap_read(chip->regmap, DA9211_REG_EVENT_B, &reg_val);
345 	if (err < 0)
346 		goto error_i2c;
347 
348 	if (reg_val & DA9211_E_OV_CURR_A) {
349 		regulator_notifier_call_chain(chip->rdev[0],
350 			REGULATOR_EVENT_OVER_CURRENT, NULL);
351 
352 		err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
353 			DA9211_E_OV_CURR_A);
354 		if (err < 0)
355 			goto error_i2c;
356 
357 		ret = IRQ_HANDLED;
358 	}
359 
360 	if (reg_val & DA9211_E_OV_CURR_B) {
361 		regulator_notifier_call_chain(chip->rdev[1],
362 			REGULATOR_EVENT_OVER_CURRENT, NULL);
363 
364 		err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
365 			DA9211_E_OV_CURR_B);
366 		if (err < 0)
367 			goto error_i2c;
368 
369 		ret = IRQ_HANDLED;
370 	}
371 
372 	return ret;
373 
374 error_i2c:
375 	dev_err(chip->dev, "I2C error : %d\n", err);
376 	return IRQ_NONE;
377 }
378 
379 static int da9211_regulator_init(struct da9211 *chip)
380 {
381 	struct regulator_config config = { };
382 	int i, ret;
383 	unsigned int data;
384 
385 	ret = regmap_read(chip->regmap, DA9211_REG_CONFIG_E, &data);
386 	if (ret < 0) {
387 		dev_err(chip->dev, "Failed to read CONFIG_E reg: %d\n", ret);
388 		return ret;
389 	}
390 
391 	data &= DA9211_SLAVE_SEL;
392 	/* If configuration for 1/2 bucks is different between platform data
393 	 * and the register, driver should exit.
394 	 */
395 	if (chip->pdata->num_buck == 1 && data == 0x00)
396 		chip->num_regulator = 1;
397 	else if (chip->pdata->num_buck == 2 && data != 0x00)
398 		chip->num_regulator = 2;
399 	else {
400 		dev_err(chip->dev, "Configuration is mismatched\n");
401 		return -EINVAL;
402 	}
403 
404 	for (i = 0; i < chip->num_regulator; i++) {
405 		config.init_data = chip->pdata->init_data[i];
406 		config.dev = chip->dev;
407 		config.driver_data = chip;
408 		config.regmap = chip->regmap;
409 		config.of_node = chip->pdata->reg_node[i];
410 
411 		if (chip->pdata->gpiod_ren[i])
412 			config.ena_gpiod = chip->pdata->gpiod_ren[i];
413 		else
414 			config.ena_gpiod = NULL;
415 
416 		/*
417 		 * Hand the GPIO descriptor management over to the regulator
418 		 * core, remove it from GPIO devres management.
419 		 */
420 		if (config.ena_gpiod)
421 			devm_gpiod_unhinge(chip->dev, config.ena_gpiod);
422 		chip->rdev[i] = devm_regulator_register(chip->dev,
423 			&da9211_regulators[i], &config);
424 		if (IS_ERR(chip->rdev[i])) {
425 			dev_err(chip->dev,
426 				"Failed to register DA9211 regulator\n");
427 			return PTR_ERR(chip->rdev[i]);
428 		}
429 
430 		if (chip->chip_irq != 0) {
431 			ret = regmap_update_bits(chip->regmap,
432 				DA9211_REG_MASK_B, DA9211_M_OV_CURR_A << i, 0);
433 			if (ret < 0) {
434 				dev_err(chip->dev,
435 					"Failed to update mask reg: %d\n", ret);
436 				return ret;
437 			}
438 		}
439 	}
440 
441 	return 0;
442 }
443 
444 /*
445  * I2C driver interface functions
446  */
447 static int da9211_i2c_probe(struct i2c_client *i2c)
448 {
449 	struct da9211 *chip;
450 	int error, ret;
451 	unsigned int data;
452 
453 	chip = devm_kzalloc(&i2c->dev, sizeof(struct da9211), GFP_KERNEL);
454 	if (!chip)
455 		return -ENOMEM;
456 
457 	chip->dev = &i2c->dev;
458 	chip->regmap = devm_regmap_init_i2c(i2c, &da9211_regmap_config);
459 	if (IS_ERR(chip->regmap)) {
460 		error = PTR_ERR(chip->regmap);
461 		dev_err(chip->dev, "Failed to allocate register map: %d\n",
462 			error);
463 		return error;
464 	}
465 
466 	i2c_set_clientdata(i2c, chip);
467 
468 	chip->pdata = i2c->dev.platform_data;
469 
470 	ret = regmap_read(chip->regmap, DA9211_REG_DEVICE_ID, &data);
471 	if (ret < 0) {
472 		dev_err(chip->dev, "Failed to read DEVICE_ID reg: %d\n", ret);
473 		return ret;
474 	}
475 
476 	switch (data) {
477 	case DA9211_DEVICE_ID:
478 		chip->chip_id = DA9211;
479 		break;
480 	case DA9213_DEVICE_ID:
481 		chip->chip_id = DA9213;
482 		break;
483 	case DA9215_DEVICE_ID:
484 		chip->chip_id = DA9215;
485 		break;
486 	default:
487 		dev_err(chip->dev, "Unsupported device id = 0x%x.\n", data);
488 		return -ENODEV;
489 	}
490 
491 	if (!chip->pdata)
492 		chip->pdata = da9211_parse_regulators_dt(chip->dev);
493 
494 	if (IS_ERR(chip->pdata)) {
495 		dev_err(chip->dev, "No regulators defined for the platform\n");
496 		return PTR_ERR(chip->pdata);
497 	}
498 
499 	chip->chip_irq = i2c->irq;
500 
501 	if (chip->chip_irq != 0) {
502 		ret = devm_request_threaded_irq(chip->dev, chip->chip_irq, NULL,
503 					da9211_irq_handler,
504 					IRQF_TRIGGER_LOW|IRQF_ONESHOT,
505 					"da9211", chip);
506 		if (ret != 0) {
507 			dev_err(chip->dev, "Failed to request IRQ: %d\n",
508 				chip->chip_irq);
509 			return ret;
510 		}
511 	} else {
512 		dev_warn(chip->dev, "No IRQ configured\n");
513 	}
514 
515 	ret = da9211_regulator_init(chip);
516 
517 	if (ret < 0)
518 		dev_err(chip->dev, "Failed to initialize regulator: %d\n", ret);
519 
520 	return ret;
521 }
522 
523 static const struct i2c_device_id da9211_i2c_id[] = {
524 	{"da9211", DA9211},
525 	{"da9212", DA9212},
526 	{"da9213", DA9213},
527 	{"da9223", DA9223},
528 	{"da9214", DA9214},
529 	{"da9224", DA9224},
530 	{"da9215", DA9215},
531 	{"da9225", DA9225},
532 	{},
533 };
534 MODULE_DEVICE_TABLE(i2c, da9211_i2c_id);
535 
536 #ifdef CONFIG_OF
537 static const struct of_device_id da9211_dt_ids[] = {
538 	{ .compatible = "dlg,da9211", .data = &da9211_i2c_id[0] },
539 	{ .compatible = "dlg,da9212", .data = &da9211_i2c_id[1] },
540 	{ .compatible = "dlg,da9213", .data = &da9211_i2c_id[2] },
541 	{ .compatible = "dlg,da9223", .data = &da9211_i2c_id[3] },
542 	{ .compatible = "dlg,da9214", .data = &da9211_i2c_id[4] },
543 	{ .compatible = "dlg,da9224", .data = &da9211_i2c_id[5] },
544 	{ .compatible = "dlg,da9215", .data = &da9211_i2c_id[6] },
545 	{ .compatible = "dlg,da9225", .data = &da9211_i2c_id[7] },
546 	{},
547 };
548 MODULE_DEVICE_TABLE(of, da9211_dt_ids);
549 #endif
550 
551 static struct i2c_driver da9211_regulator_driver = {
552 	.driver = {
553 		.name = "da9211",
554 		.of_match_table = of_match_ptr(da9211_dt_ids),
555 	},
556 	.probe_new = da9211_i2c_probe,
557 	.id_table = da9211_i2c_id,
558 };
559 
560 module_i2c_driver(da9211_regulator_driver);
561 
562 MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
563 MODULE_DESCRIPTION("DA9211/DA9212/DA9213/DA9223/DA9214/DA9224/DA9215/DA9225 regulator driver");
564 MODULE_LICENSE("GPL");
565