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