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
 35struct 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
 45static 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
 57static 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 */
 73static 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 */
 80static 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 */
 87static 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
 92static 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
118static 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
141static 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
179static 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
212static 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
241static struct regulator_desc da9211_regulators[] = {
242	DA9211_BUCK(BUCKA),
243	DA9211_BUCK(BUCKB),
244};
245
246#ifdef CONFIG_OF
247static struct of_regulator_match da9211_matches[] = {
248	[DA9211_ID_BUCKA] = { .name = "BUCKA" },
249	[DA9211_ID_BUCKB] = { .name = "BUCKB" },
250	};
251
252static 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-gpios",
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
300static struct da9211_pdata *da9211_parse_regulators_dt(
301		struct device *dev)
302{
303	return ERR_PTR(-ENODEV);
304}
305#endif
306
307static 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
346error_i2c:
347	dev_err(chip->dev, "I2C error : %d\n", err);
348	return IRQ_NONE;
349}
350
351static 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 */
419static 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
496static 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};
507MODULE_DEVICE_TABLE(i2c, da9211_i2c_id);
508
509#ifdef CONFIG_OF
510static 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};
521MODULE_DEVICE_TABLE(of, da9211_dt_ids);
522#endif
523
524static 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
533module_i2c_driver(da9211_regulator_driver);
534
535MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
536MODULE_DESCRIPTION("DA9211/DA9212/DA9213/DA9223/DA9214/DA9224/DA9215/DA9225 regulator driver");
537MODULE_LICENSE("GPL");