1 /*
2  * da9211-regulator.c - Regulator device driver for DA9211/DA9212
3  * /DA9213/DA9214/DA9215
4  * Copyright (C) 2015  Dialog Semiconductor Ltd.
5  *
6  * This library is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Library General Public
8  * License as published by the Free Software Foundation; either
9  * version 2 of the License, or (at your option) any later version.
10  *
11  * This library is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14  * Library General Public License for more details.
15  */
16 
17 #include <linux/err.h>
18 #include <linux/gpio.h>
19 #include <linux/i2c.h>
20 #include <linux/module.h>
21 #include <linux/init.h>
22 #include <linux/slab.h>
23 #include <linux/regulator/driver.h>
24 #include <linux/regulator/machine.h>
25 #include <linux/regmap.h>
26 #include <linux/irq.h>
27 #include <linux/interrupt.h>
28 #include <linux/of_gpio.h>
29 #include <linux/regulator/of_regulator.h>
30 #include <linux/regulator/da9211.h>
31 #include "da9211-regulator.h"
32 
33 /* DEVICE IDs */
34 #define DA9211_DEVICE_ID	0x22
35 #define DA9213_DEVICE_ID	0x23
36 #define DA9215_DEVICE_ID	0x24
37 
38 #define DA9211_BUCK_MODE_SLEEP	1
39 #define DA9211_BUCK_MODE_SYNC	2
40 #define DA9211_BUCK_MODE_AUTO	3
41 
42 /* DA9211 REGULATOR IDs */
43 #define DA9211_ID_BUCKA	0
44 #define DA9211_ID_BUCKB	1
45 
46 struct da9211 {
47 	struct device *dev;
48 	struct regmap *regmap;
49 	struct da9211_pdata *pdata;
50 	struct regulator_dev *rdev[DA9211_MAX_REGULATORS];
51 	int num_regulator;
52 	int chip_irq;
53 	int chip_id;
54 };
55 
56 static const struct regmap_range_cfg da9211_regmap_range[] = {
57 	{
58 		.selector_reg = DA9211_REG_PAGE_CON,
59 		.selector_mask  = DA9211_REG_PAGE_MASK,
60 		.selector_shift = DA9211_REG_PAGE_SHIFT,
61 		.window_start = 0,
62 		.window_len = 256,
63 		.range_min = 0,
64 		.range_max = 5*128,
65 	},
66 };
67 
68 static const struct regmap_config da9211_regmap_config = {
69 	.reg_bits = 8,
70 	.val_bits = 8,
71 	.max_register = 5 * 128,
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_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 }
251 
252 static struct regulator_desc da9211_regulators[] = {
253 	DA9211_BUCK(BUCKA),
254 	DA9211_BUCK(BUCKB),
255 };
256 
257 #ifdef CONFIG_OF
258 static struct of_regulator_match da9211_matches[] = {
259 	[DA9211_ID_BUCKA] = { .name = "BUCKA" },
260 	[DA9211_ID_BUCKB] = { .name = "BUCKB" },
261 	};
262 
263 static struct da9211_pdata *da9211_parse_regulators_dt(
264 		struct device *dev)
265 {
266 	struct da9211_pdata *pdata;
267 	struct device_node *node;
268 	int i, num, n;
269 
270 	node = of_get_child_by_name(dev->of_node, "regulators");
271 	if (!node) {
272 		dev_err(dev, "regulators node not found\n");
273 		return ERR_PTR(-ENODEV);
274 	}
275 
276 	num = of_regulator_match(dev, node, da9211_matches,
277 				 ARRAY_SIZE(da9211_matches));
278 	of_node_put(node);
279 	if (num < 0) {
280 		dev_err(dev, "Failed to match regulators\n");
281 		return ERR_PTR(-EINVAL);
282 	}
283 
284 	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
285 	if (!pdata)
286 		return ERR_PTR(-ENOMEM);
287 
288 	pdata->num_buck = num;
289 
290 	n = 0;
291 	for (i = 0; i < ARRAY_SIZE(da9211_matches); i++) {
292 		if (!da9211_matches[i].init_data)
293 			continue;
294 
295 		pdata->init_data[n] = da9211_matches[i].init_data;
296 		pdata->reg_node[n] = da9211_matches[i].of_node;
297 		pdata->gpio_ren[n] =
298 			of_get_named_gpio(da9211_matches[i].of_node,
299 				"enable-gpios", 0);
300 		n++;
301 	}
302 
303 	return pdata;
304 }
305 #else
306 static struct da9211_pdata *da9211_parse_regulators_dt(
307 		struct device *dev)
308 {
309 	return ERR_PTR(-ENODEV);
310 }
311 #endif
312 
313 static irqreturn_t da9211_irq_handler(int irq, void *data)
314 {
315 	struct da9211 *chip = data;
316 	int reg_val, err, ret = IRQ_NONE;
317 
318 	err = regmap_read(chip->regmap, DA9211_REG_EVENT_B, &reg_val);
319 	if (err < 0)
320 		goto error_i2c;
321 
322 	if (reg_val & DA9211_E_OV_CURR_A) {
323 		regulator_notifier_call_chain(chip->rdev[0],
324 			REGULATOR_EVENT_OVER_CURRENT, NULL);
325 
326 		err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
327 			DA9211_E_OV_CURR_A);
328 		if (err < 0)
329 			goto error_i2c;
330 
331 		ret = IRQ_HANDLED;
332 	}
333 
334 	if (reg_val & DA9211_E_OV_CURR_B) {
335 		regulator_notifier_call_chain(chip->rdev[1],
336 			REGULATOR_EVENT_OVER_CURRENT, NULL);
337 
338 		err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
339 			DA9211_E_OV_CURR_B);
340 		if (err < 0)
341 			goto error_i2c;
342 
343 		ret = IRQ_HANDLED;
344 	}
345 
346 	return ret;
347 
348 error_i2c:
349 	dev_err(chip->dev, "I2C error : %d\n", err);
350 	return IRQ_NONE;
351 }
352 
353 static int da9211_regulator_init(struct da9211 *chip)
354 {
355 	struct regulator_config config = { };
356 	int i, ret;
357 	unsigned int data;
358 
359 	ret = regmap_read(chip->regmap, DA9211_REG_CONFIG_E, &data);
360 	if (ret < 0) {
361 		dev_err(chip->dev, "Failed to read CONFIG_E reg: %d\n", ret);
362 		return ret;
363 	}
364 
365 	data &= DA9211_SLAVE_SEL;
366 	/* If configuration for 1/2 bucks is different between platform data
367 	 * and the register, driver should exit.
368 	 */
369 	if (chip->pdata->num_buck == 1 && data == 0x00)
370 		chip->num_regulator = 1;
371 	else if (chip->pdata->num_buck == 2 && data != 0x00)
372 		chip->num_regulator = 2;
373 	else {
374 		dev_err(chip->dev, "Configuration is mismatched\n");
375 		return -EINVAL;
376 	}
377 
378 	for (i = 0; i < chip->num_regulator; i++) {
379 		config.init_data = chip->pdata->init_data[i];
380 		config.dev = chip->dev;
381 		config.driver_data = chip;
382 		config.regmap = chip->regmap;
383 		config.of_node = chip->pdata->reg_node[i];
384 
385 		if (gpio_is_valid(chip->pdata->gpio_ren[i])) {
386 			config.ena_gpio = chip->pdata->gpio_ren[i];
387 			config.ena_gpio_initialized = true;
388 		} else {
389 			config.ena_gpio = -EINVAL;
390 			config.ena_gpio_initialized = false;
391 		}
392 
393 		chip->rdev[i] = devm_regulator_register(chip->dev,
394 			&da9211_regulators[i], &config);
395 		if (IS_ERR(chip->rdev[i])) {
396 			dev_err(chip->dev,
397 				"Failed to register DA9211 regulator\n");
398 			return PTR_ERR(chip->rdev[i]);
399 		}
400 
401 		if (chip->chip_irq != 0) {
402 			ret = regmap_update_bits(chip->regmap,
403 				DA9211_REG_MASK_B, DA9211_M_OV_CURR_A << i, 0);
404 			if (ret < 0) {
405 				dev_err(chip->dev,
406 					"Failed to update mask reg: %d\n", ret);
407 				return ret;
408 			}
409 		}
410 	}
411 
412 	return 0;
413 }
414 
415 /*
416  * I2C driver interface functions
417  */
418 static int da9211_i2c_probe(struct i2c_client *i2c,
419 		const struct i2c_device_id *id)
420 {
421 	struct da9211 *chip;
422 	int error, ret;
423 	unsigned int data;
424 
425 	chip = devm_kzalloc(&i2c->dev, sizeof(struct da9211), GFP_KERNEL);
426 	if (!chip)
427 		return -ENOMEM;
428 
429 	chip->dev = &i2c->dev;
430 	chip->regmap = devm_regmap_init_i2c(i2c, &da9211_regmap_config);
431 	if (IS_ERR(chip->regmap)) {
432 		error = PTR_ERR(chip->regmap);
433 		dev_err(chip->dev, "Failed to allocate register map: %d\n",
434 			error);
435 		return error;
436 	}
437 
438 	i2c_set_clientdata(i2c, chip);
439 
440 	chip->pdata = i2c->dev.platform_data;
441 
442 	ret = regmap_read(chip->regmap, DA9211_REG_DEVICE_ID, &data);
443 	if (ret < 0) {
444 		dev_err(chip->dev, "Failed to read DEVICE_ID reg: %d\n", ret);
445 		return ret;
446 	}
447 
448 	switch (data) {
449 	case DA9211_DEVICE_ID:
450 		chip->chip_id = DA9211;
451 		break;
452 	case DA9213_DEVICE_ID:
453 		chip->chip_id = DA9213;
454 		break;
455 	case DA9215_DEVICE_ID:
456 		chip->chip_id = DA9215;
457 		break;
458 	default:
459 		dev_err(chip->dev, "Unsupported device id = 0x%x.\n", data);
460 		return -ENODEV;
461 	}
462 
463 	if (!chip->pdata)
464 		chip->pdata = da9211_parse_regulators_dt(chip->dev);
465 
466 	if (IS_ERR(chip->pdata)) {
467 		dev_err(chip->dev, "No regulators defined for the platform\n");
468 		return PTR_ERR(chip->pdata);
469 	}
470 
471 	chip->chip_irq = i2c->irq;
472 
473 	if (chip->chip_irq != 0) {
474 		ret = devm_request_threaded_irq(chip->dev, chip->chip_irq, NULL,
475 					da9211_irq_handler,
476 					IRQF_TRIGGER_LOW|IRQF_ONESHOT,
477 					"da9211", chip);
478 		if (ret != 0) {
479 			dev_err(chip->dev, "Failed to request IRQ: %d\n",
480 				chip->chip_irq);
481 			return ret;
482 		}
483 	} else {
484 		dev_warn(chip->dev, "No IRQ configured\n");
485 	}
486 
487 	ret = da9211_regulator_init(chip);
488 
489 	if (ret < 0)
490 		dev_err(chip->dev, "Failed to initialize regulator: %d\n", ret);
491 
492 	return ret;
493 }
494 
495 static const struct i2c_device_id da9211_i2c_id[] = {
496 	{"da9211", DA9211},
497 	{"da9212", DA9212},
498 	{"da9213", DA9213},
499 	{"da9214", DA9214},
500 	{"da9215", DA9215},
501 	{},
502 };
503 MODULE_DEVICE_TABLE(i2c, da9211_i2c_id);
504 
505 #ifdef CONFIG_OF
506 static const struct of_device_id da9211_dt_ids[] = {
507 	{ .compatible = "dlg,da9211", .data = &da9211_i2c_id[0] },
508 	{ .compatible = "dlg,da9212", .data = &da9211_i2c_id[1] },
509 	{ .compatible = "dlg,da9213", .data = &da9211_i2c_id[2] },
510 	{ .compatible = "dlg,da9214", .data = &da9211_i2c_id[3] },
511 	{ .compatible = "dlg,da9215", .data = &da9211_i2c_id[4] },
512 	{},
513 };
514 MODULE_DEVICE_TABLE(of, da9211_dt_ids);
515 #endif
516 
517 static struct i2c_driver da9211_regulator_driver = {
518 	.driver = {
519 		.name = "da9211",
520 		.of_match_table = of_match_ptr(da9211_dt_ids),
521 	},
522 	.probe = da9211_i2c_probe,
523 	.id_table = da9211_i2c_id,
524 };
525 
526 module_i2c_driver(da9211_regulator_driver);
527 
528 MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
529 MODULE_DESCRIPTION("DA9211/DA9212/DA9213/DA9214/DA9215 regulator driver");
530 MODULE_LICENSE("GPL");
531