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