1 /*
2  * da9211-regulator.c - Regulator device driver for DA9211/DA9213
3  * Copyright (C) 2014  Dialog Semiconductor Ltd.
4  *
5  * This library is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU Library General Public
7  * License as published by the Free Software Foundation; either
8  * version 2 of the License, or (at your option) any later version.
9  *
10  * This library is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13  * Library General Public License for more details.
14  */
15 
16 #include <linux/err.h>
17 #include <linux/gpio.h>
18 #include <linux/i2c.h>
19 #include <linux/module.h>
20 #include <linux/init.h>
21 #include <linux/slab.h>
22 #include <linux/regulator/driver.h>
23 #include <linux/regulator/machine.h>
24 #include <linux/regmap.h>
25 #include <linux/irq.h>
26 #include <linux/interrupt.h>
27 #include <linux/of_gpio.h>
28 #include <linux/regulator/of_regulator.h>
29 #include <linux/regulator/da9211.h>
30 #include "da9211-regulator.h"
31 
32 /* DEVICE IDs */
33 #define DA9211_DEVICE_ID	0x22
34 #define DA9213_DEVICE_ID	0x23
35 
36 #define DA9211_BUCK_MODE_SLEEP	1
37 #define DA9211_BUCK_MODE_SYNC	2
38 #define DA9211_BUCK_MODE_AUTO	3
39 
40 /* DA9211 REGULATOR IDs */
41 #define DA9211_ID_BUCKA	0
42 #define DA9211_ID_BUCKB	1
43 
44 struct da9211 {
45 	struct device *dev;
46 	struct regmap *regmap;
47 	struct da9211_pdata *pdata;
48 	struct regulator_dev *rdev[DA9211_MAX_REGULATORS];
49 	int num_regulator;
50 	int chip_irq;
51 	int chip_id;
52 };
53 
54 static const struct regmap_range_cfg da9211_regmap_range[] = {
55 	{
56 		.selector_reg = DA9211_REG_PAGE_CON,
57 		.selector_mask  = DA9211_REG_PAGE_MASK,
58 		.selector_shift = DA9211_REG_PAGE_SHIFT,
59 		.window_start = 0,
60 		.window_len = 256,
61 		.range_min = 0,
62 		.range_max = 5*128,
63 	},
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 	.ranges = da9211_regmap_range,
71 	.num_ranges = ARRAY_SIZE(da9211_regmap_range),
72 };
73 
74 /* Default limits measured in millivolts and milliamps */
75 #define DA9211_MIN_MV		300
76 #define DA9211_MAX_MV		1570
77 #define DA9211_STEP_MV		10
78 
79 /* Current limits for DA9211 buck (uA) indices
80  * corresponds with register values
81  */
82 static const int da9211_current_limits[] = {
83 	2000000, 2200000, 2400000, 2600000, 2800000, 3000000, 3200000, 3400000,
84 	3600000, 3800000, 4000000, 4200000, 4400000, 4600000, 4800000, 5000000
85 };
86 /* Current limits for DA9213 buck (uA) indices
87  * corresponds with register values
88  */
89 static const int da9213_current_limits[] = {
90 	3000000, 3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000,
91 	4600000, 4800000, 5000000, 5200000, 5400000, 5600000, 5800000, 6000000
92 };
93 
94 static unsigned int da9211_buck_get_mode(struct regulator_dev *rdev)
95 {
96 	int id = rdev_get_id(rdev);
97 	struct da9211 *chip = rdev_get_drvdata(rdev);
98 	unsigned int data;
99 	int ret, mode = 0;
100 
101 	ret = regmap_read(chip->regmap, DA9211_REG_BUCKA_CONF+id, &data);
102 	if (ret < 0)
103 		return ret;
104 
105 	switch (data & 0x03) {
106 	case DA9211_BUCK_MODE_SYNC:
107 		mode = REGULATOR_MODE_FAST;
108 		break;
109 	case DA9211_BUCK_MODE_AUTO:
110 		mode = REGULATOR_MODE_NORMAL;
111 		break;
112 	case DA9211_BUCK_MODE_SLEEP:
113 		mode = REGULATOR_MODE_STANDBY;
114 		break;
115 	}
116 
117 	return mode;
118 }
119 
120 static int da9211_buck_set_mode(struct regulator_dev *rdev,
121 					unsigned int mode)
122 {
123 	int id = rdev_get_id(rdev);
124 	struct da9211 *chip = rdev_get_drvdata(rdev);
125 	int val = 0;
126 
127 	switch (mode) {
128 	case REGULATOR_MODE_FAST:
129 		val = DA9211_BUCK_MODE_SYNC;
130 		break;
131 	case REGULATOR_MODE_NORMAL:
132 		val = DA9211_BUCK_MODE_AUTO;
133 		break;
134 	case REGULATOR_MODE_STANDBY:
135 		val = DA9211_BUCK_MODE_SLEEP;
136 		break;
137 	}
138 
139 	return regmap_update_bits(chip->regmap, DA9211_REG_BUCKA_CONF+id,
140 					0x03, val);
141 }
142 
143 static int da9211_set_current_limit(struct regulator_dev *rdev, int min,
144 				    int max)
145 {
146 	int id = rdev_get_id(rdev);
147 	struct da9211 *chip = rdev_get_drvdata(rdev);
148 	int i, max_size;
149 	const int *current_limits;
150 
151 	switch (chip->chip_id) {
152 	case DA9211:
153 		current_limits = da9211_current_limits;
154 		max_size = ARRAY_SIZE(da9211_current_limits)-1;
155 		break;
156 	case DA9213:
157 		current_limits = da9213_current_limits;
158 		max_size = ARRAY_SIZE(da9213_current_limits)-1;
159 		break;
160 	default:
161 		return -EINVAL;
162 	}
163 
164 	/* search for closest to maximum */
165 	for (i = max_size; i >= 0; i--) {
166 		if (min <= current_limits[i] &&
167 		    max >= current_limits[i]) {
168 				return regmap_update_bits(chip->regmap,
169 					DA9211_REG_BUCK_ILIM,
170 					(0x0F << id*4), (i << id*4));
171 		}
172 	}
173 
174 	return -EINVAL;
175 }
176 
177 static int da9211_get_current_limit(struct regulator_dev *rdev)
178 {
179 	int id = rdev_get_id(rdev);
180 	struct da9211 *chip = rdev_get_drvdata(rdev);
181 	unsigned int data;
182 	int ret;
183 	const int *current_limits;
184 
185 	switch (chip->chip_id) {
186 	case DA9211:
187 		current_limits = da9211_current_limits;
188 		break;
189 	case DA9213:
190 		current_limits = da9213_current_limits;
191 		break;
192 	default:
193 		return -EINVAL;
194 	}
195 
196 	ret = regmap_read(chip->regmap, DA9211_REG_BUCK_ILIM, &data);
197 	if (ret < 0)
198 		return ret;
199 
200 	/* select one of 16 values: 0000 (2000mA or 3000mA)
201 	 * to 1111 (5000mA or 6000mA).
202 	 */
203 	data = (data >> id*4) & 0x0F;
204 	return current_limits[data];
205 }
206 
207 static struct regulator_ops da9211_buck_ops = {
208 	.get_mode = da9211_buck_get_mode,
209 	.set_mode = da9211_buck_set_mode,
210 	.enable = regulator_enable_regmap,
211 	.disable = regulator_disable_regmap,
212 	.is_enabled = regulator_is_enabled_regmap,
213 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
214 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
215 	.list_voltage = regulator_list_voltage_linear,
216 	.set_current_limit = da9211_set_current_limit,
217 	.get_current_limit = da9211_get_current_limit,
218 };
219 
220 #define DA9211_BUCK(_id) \
221 {\
222 	.name = #_id,\
223 	.ops = &da9211_buck_ops,\
224 	.type = REGULATOR_VOLTAGE,\
225 	.id = DA9211_ID_##_id,\
226 	.n_voltages = (DA9211_MAX_MV - DA9211_MIN_MV) / DA9211_STEP_MV + 1,\
227 	.min_uV = (DA9211_MIN_MV * 1000),\
228 	.uV_step = (DA9211_STEP_MV * 1000),\
229 	.enable_reg = DA9211_REG_BUCKA_CONT + DA9211_ID_##_id,\
230 	.enable_mask = DA9211_BUCKA_EN,\
231 	.vsel_reg = DA9211_REG_VBUCKA_A + DA9211_ID_##_id * 2,\
232 	.vsel_mask = DA9211_VBUCK_MASK,\
233 	.owner = THIS_MODULE,\
234 }
235 
236 static struct regulator_desc da9211_regulators[] = {
237 	DA9211_BUCK(BUCKA),
238 	DA9211_BUCK(BUCKB),
239 };
240 
241 #ifdef CONFIG_OF
242 static struct of_regulator_match da9211_matches[] = {
243 	[DA9211_ID_BUCKA] = { .name = "BUCKA" },
244 	[DA9211_ID_BUCKB] = { .name = "BUCKB" },
245 	};
246 
247 static struct da9211_pdata *da9211_parse_regulators_dt(
248 		struct device *dev)
249 {
250 	struct da9211_pdata *pdata;
251 	struct device_node *node;
252 	int i, num, n;
253 
254 	node = of_get_child_by_name(dev->of_node, "regulators");
255 	if (!node) {
256 		dev_err(dev, "regulators node not found\n");
257 		return ERR_PTR(-ENODEV);
258 	}
259 
260 	num = of_regulator_match(dev, node, da9211_matches,
261 				 ARRAY_SIZE(da9211_matches));
262 	of_node_put(node);
263 	if (num < 0) {
264 		dev_err(dev, "Failed to match regulators\n");
265 		return ERR_PTR(-EINVAL);
266 	}
267 
268 	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
269 	if (!pdata)
270 		return ERR_PTR(-ENOMEM);
271 
272 	pdata->num_buck = num;
273 
274 	n = 0;
275 	for (i = 0; i < ARRAY_SIZE(da9211_matches); i++) {
276 		if (!da9211_matches[i].init_data)
277 			continue;
278 
279 		pdata->init_data[n] = da9211_matches[i].init_data;
280 		pdata->reg_node[n] = da9211_matches[i].of_node;
281 		pdata->gpio_ren[n] =
282 			of_get_named_gpio(da9211_matches[i].of_node,
283 				"enable-gpios", 0);
284 		n++;
285 	}
286 
287 	return pdata;
288 }
289 #else
290 static struct da9211_pdata *da9211_parse_regulators_dt(
291 		struct device *dev)
292 {
293 	return ERR_PTR(-ENODEV);
294 }
295 #endif
296 
297 static irqreturn_t da9211_irq_handler(int irq, void *data)
298 {
299 	struct da9211 *chip = data;
300 	int reg_val, err, ret = IRQ_NONE;
301 
302 	err = regmap_read(chip->regmap, DA9211_REG_EVENT_B, &reg_val);
303 	if (err < 0)
304 		goto error_i2c;
305 
306 	if (reg_val & DA9211_E_OV_CURR_A) {
307 		regulator_notifier_call_chain(chip->rdev[0],
308 			REGULATOR_EVENT_OVER_CURRENT,
309 			rdev_get_drvdata(chip->rdev[0]));
310 
311 		err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
312 			DA9211_E_OV_CURR_A);
313 		if (err < 0)
314 			goto error_i2c;
315 
316 		ret = IRQ_HANDLED;
317 	}
318 
319 	if (reg_val & DA9211_E_OV_CURR_B) {
320 		regulator_notifier_call_chain(chip->rdev[1],
321 			REGULATOR_EVENT_OVER_CURRENT,
322 			rdev_get_drvdata(chip->rdev[1]));
323 
324 		err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
325 			DA9211_E_OV_CURR_B);
326 		if (err < 0)
327 			goto error_i2c;
328 
329 		ret = IRQ_HANDLED;
330 	}
331 
332 	return ret;
333 
334 error_i2c:
335 	dev_err(chip->dev, "I2C error : %d\n", err);
336 	return IRQ_NONE;
337 }
338 
339 static int da9211_regulator_init(struct da9211 *chip)
340 {
341 	struct regulator_config config = { };
342 	int i, ret;
343 	unsigned int data;
344 
345 	ret = regmap_read(chip->regmap, DA9211_REG_CONFIG_E, &data);
346 	if (ret < 0) {
347 		dev_err(chip->dev, "Failed to read CONTROL_E reg: %d\n", ret);
348 		return ret;
349 	}
350 
351 	data &= DA9211_SLAVE_SEL;
352 	/* If configuration for 1/2 bucks is different between platform data
353 	 * and the register, driver should exit.
354 	 */
355 	if ((chip->pdata->num_buck == 2 && data == 0x40)
356 		|| (chip->pdata->num_buck == 1 && data == 0x00)) {
357 		if (data == 0)
358 			chip->num_regulator = 1;
359 		else
360 			chip->num_regulator = 2;
361 	} else {
362 		dev_err(chip->dev, "Configuration is mismatched\n");
363 		return -EINVAL;
364 	}
365 
366 	for (i = 0; i < chip->num_regulator; i++) {
367 		config.init_data = chip->pdata->init_data[i];
368 		config.dev = chip->dev;
369 		config.driver_data = chip;
370 		config.regmap = chip->regmap;
371 		config.of_node = chip->pdata->reg_node[i];
372 
373 		if (gpio_is_valid(chip->pdata->gpio_ren[i])) {
374 			config.ena_gpio = chip->pdata->gpio_ren[i];
375 			config.ena_gpio_initialized = true;
376 		} else {
377 			config.ena_gpio = -EINVAL;
378 			config.ena_gpio_initialized = false;
379 		}
380 
381 		chip->rdev[i] = devm_regulator_register(chip->dev,
382 			&da9211_regulators[i], &config);
383 		if (IS_ERR(chip->rdev[i])) {
384 			dev_err(chip->dev,
385 				"Failed to register DA9211 regulator\n");
386 			return PTR_ERR(chip->rdev[i]);
387 		}
388 
389 		if (chip->chip_irq != 0) {
390 			ret = regmap_update_bits(chip->regmap,
391 				DA9211_REG_MASK_B, DA9211_M_OV_CURR_A << i, 0);
392 			if (ret < 0) {
393 				dev_err(chip->dev,
394 					"Failed to update mask reg: %d\n", ret);
395 				return ret;
396 			}
397 		}
398 	}
399 
400 	return 0;
401 }
402 
403 /*
404  * I2C driver interface functions
405  */
406 static int da9211_i2c_probe(struct i2c_client *i2c,
407 		const struct i2c_device_id *id)
408 {
409 	struct da9211 *chip;
410 	int error, ret;
411 	unsigned int data;
412 
413 	chip = devm_kzalloc(&i2c->dev, sizeof(struct da9211), GFP_KERNEL);
414 	if (!chip)
415 		return -ENOMEM;
416 
417 	chip->dev = &i2c->dev;
418 	chip->regmap = devm_regmap_init_i2c(i2c, &da9211_regmap_config);
419 	if (IS_ERR(chip->regmap)) {
420 		error = PTR_ERR(chip->regmap);
421 		dev_err(chip->dev, "Failed to allocate register map: %d\n",
422 			error);
423 		return error;
424 	}
425 
426 	i2c_set_clientdata(i2c, chip);
427 
428 	chip->pdata = i2c->dev.platform_data;
429 
430 	ret = regmap_read(chip->regmap, DA9211_REG_DEVICE_ID, &data);
431 	if (ret < 0) {
432 		dev_err(chip->dev, "Failed to read DEVICE_ID reg: %d\n", ret);
433 		return ret;
434 	}
435 
436 	switch (data) {
437 	case DA9211_DEVICE_ID:
438 		chip->chip_id = DA9211;
439 		break;
440 	case DA9213_DEVICE_ID:
441 		chip->chip_id = DA9213;
442 		break;
443 	default:
444 		dev_err(chip->dev, "Unsupported device id = 0x%x.\n", data);
445 		return -ENODEV;
446 	}
447 
448 	if (!chip->pdata)
449 		chip->pdata = da9211_parse_regulators_dt(chip->dev);
450 
451 	if (IS_ERR(chip->pdata)) {
452 		dev_err(chip->dev, "No regulators defined for the platform\n");
453 		return PTR_ERR(chip->pdata);
454 	}
455 
456 	chip->chip_irq = i2c->irq;
457 
458 	if (chip->chip_irq != 0) {
459 		ret = devm_request_threaded_irq(chip->dev, chip->chip_irq, NULL,
460 					da9211_irq_handler,
461 					IRQF_TRIGGER_LOW|IRQF_ONESHOT,
462 					"da9211", chip);
463 		if (ret != 0) {
464 			dev_err(chip->dev, "Failed to request IRQ: %d\n",
465 				chip->chip_irq);
466 			return ret;
467 		}
468 	} else {
469 		dev_warn(chip->dev, "No IRQ configured\n");
470 	}
471 
472 	ret = da9211_regulator_init(chip);
473 
474 	if (ret < 0)
475 		dev_err(chip->dev, "Failed to initialize regulator: %d\n", ret);
476 
477 	return ret;
478 }
479 
480 static const struct i2c_device_id da9211_i2c_id[] = {
481 	{"da9211", DA9211},
482 	{"da9213", DA9213},
483 	{},
484 };
485 MODULE_DEVICE_TABLE(i2c, da9211_i2c_id);
486 
487 #ifdef CONFIG_OF
488 static const struct of_device_id da9211_dt_ids[] = {
489 	{ .compatible = "dlg,da9211", .data = &da9211_i2c_id[0] },
490 	{ .compatible = "dlg,da9213", .data = &da9211_i2c_id[1] },
491 	{},
492 };
493 MODULE_DEVICE_TABLE(of, da9211_dt_ids);
494 #endif
495 
496 static struct i2c_driver da9211_regulator_driver = {
497 	.driver = {
498 		.name = "da9211",
499 		.owner = THIS_MODULE,
500 		.of_match_table = of_match_ptr(da9211_dt_ids),
501 	},
502 	.probe = da9211_i2c_probe,
503 	.id_table = da9211_i2c_id,
504 };
505 
506 module_i2c_driver(da9211_regulator_driver);
507 
508 MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
509 MODULE_DESCRIPTION("Regulator device driver for Dialog DA9211/DA9213");
510 MODULE_LICENSE("GPL v2");
511