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
 46struct 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
 56static 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
 68static 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 */
 84static 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 */
 91static 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 */
 98static 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
103static 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
129static 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
152static 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
190static 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
223static 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
252static struct regulator_desc da9211_regulators[] = {
253	DA9211_BUCK(BUCKA),
254	DA9211_BUCK(BUCKB),
255};
256
257#ifdef CONFIG_OF
258static struct of_regulator_match da9211_matches[] = {
259	[DA9211_ID_BUCKA] = { .name = "BUCKA" },
260	[DA9211_ID_BUCKB] = { .name = "BUCKB" },
261	};
262
263static 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
306static struct da9211_pdata *da9211_parse_regulators_dt(
307		struct device *dev)
308{
309	return ERR_PTR(-ENODEV);
310}
311#endif
312
313static 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
348error_i2c:
349	dev_err(chip->dev, "I2C error : %d\n", err);
350	return IRQ_NONE;
351}
352
353static 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 */
418static 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
495static 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};
503MODULE_DEVICE_TABLE(i2c, da9211_i2c_id);
504
505#ifdef CONFIG_OF
506static 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};
514MODULE_DEVICE_TABLE(of, da9211_dt_ids);
515#endif
516
517static 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
526module_i2c_driver(da9211_regulator_driver);
527
528MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
529MODULE_DESCRIPTION("DA9211/DA9212/DA9213/DA9214/DA9215 regulator driver");
530MODULE_LICENSE("GPL");