File: da9211-regulator.c

package info (click to toggle)
linux 4.19.20-1
  • links: PTS, VCS
  • area: main
  • in suites: buster
  • size: 954,852 kB
  • sloc: ansic: 16,749,828; asm: 271,286; makefile: 38,257; sh: 32,808; perl: 27,671; python: 21,022; cpp: 5,063; yacc: 4,648; lex: 2,585; awk: 1,385; ruby: 25; sed: 5
file content (535 lines) | stat: -rw-r--r-- 13,497 bytes parent folder | download | duplicates (7)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
/*
 * da9211-regulator.c - Regulator device driver for DA9211/DA9212
 * /DA9213/DA9223/DA9214/DA9224/DA9215/DA9225
 * Copyright (C) 2015  Dialog Semiconductor Ltd.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 */

#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regmap.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/gpio/consumer.h>
#include <linux/regulator/of_regulator.h>
#include <linux/regulator/da9211.h>
#include "da9211-regulator.h"

/* DEVICE IDs */
#define DA9211_DEVICE_ID	0x22
#define DA9213_DEVICE_ID	0x23
#define DA9215_DEVICE_ID	0x24

#define DA9211_BUCK_MODE_SLEEP	1
#define DA9211_BUCK_MODE_SYNC	2
#define DA9211_BUCK_MODE_AUTO	3

/* DA9211 REGULATOR IDs */
#define DA9211_ID_BUCKA	0
#define DA9211_ID_BUCKB	1

struct da9211 {
	struct device *dev;
	struct regmap *regmap;
	struct da9211_pdata *pdata;
	struct regulator_dev *rdev[DA9211_MAX_REGULATORS];
	int num_regulator;
	int chip_irq;
	int chip_id;
};

static const struct regmap_range_cfg da9211_regmap_range[] = {
	{
		.selector_reg = DA9211_REG_PAGE_CON,
		.selector_mask  = DA9211_REG_PAGE_MASK,
		.selector_shift = DA9211_REG_PAGE_SHIFT,
		.window_start = 0,
		.window_len = 256,
		.range_min = 0,
		.range_max = 5*128,
	},
};

static const struct regmap_config da9211_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = 5 * 128,
	.ranges = da9211_regmap_range,
	.num_ranges = ARRAY_SIZE(da9211_regmap_range),
};

/* Default limits measured in millivolts and milliamps */
#define DA9211_MIN_MV		300
#define DA9211_MAX_MV		1570
#define DA9211_STEP_MV		10

/* Current limits for DA9211 buck (uA) indices
 * corresponds with register values
 */
static const int da9211_current_limits[] = {
	2000000, 2200000, 2400000, 2600000, 2800000, 3000000, 3200000, 3400000,
	3600000, 3800000, 4000000, 4200000, 4400000, 4600000, 4800000, 5000000
};
/* Current limits for DA9213 buck (uA) indices
 * corresponds with register values
 */
static const int da9213_current_limits[] = {
	3000000, 3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000,
	4600000, 4800000, 5000000, 5200000, 5400000, 5600000, 5800000, 6000000
};
/* Current limits for DA9215 buck (uA) indices
 * corresponds with register values
 */
static const int da9215_current_limits[] = {
	4000000, 4200000, 4400000, 4600000, 4800000, 5000000, 5200000, 5400000,
	5600000, 5800000, 6000000, 6200000, 6400000, 6600000, 6800000, 7000000
};

static unsigned int da9211_buck_get_mode(struct regulator_dev *rdev)
{
	int id = rdev_get_id(rdev);
	struct da9211 *chip = rdev_get_drvdata(rdev);
	unsigned int data;
	int ret, mode = 0;

	ret = regmap_read(chip->regmap, DA9211_REG_BUCKA_CONF+id, &data);
	if (ret < 0)
		return ret;

	switch (data & 0x03) {
	case DA9211_BUCK_MODE_SYNC:
		mode = REGULATOR_MODE_FAST;
		break;
	case DA9211_BUCK_MODE_AUTO:
		mode = REGULATOR_MODE_NORMAL;
		break;
	case DA9211_BUCK_MODE_SLEEP:
		mode = REGULATOR_MODE_STANDBY;
		break;
	}

	return mode;
}

static int da9211_buck_set_mode(struct regulator_dev *rdev,
					unsigned int mode)
{
	int id = rdev_get_id(rdev);
	struct da9211 *chip = rdev_get_drvdata(rdev);
	int val = 0;

	switch (mode) {
	case REGULATOR_MODE_FAST:
		val = DA9211_BUCK_MODE_SYNC;
		break;
	case REGULATOR_MODE_NORMAL:
		val = DA9211_BUCK_MODE_AUTO;
		break;
	case REGULATOR_MODE_STANDBY:
		val = DA9211_BUCK_MODE_SLEEP;
		break;
	}

	return regmap_update_bits(chip->regmap, DA9211_REG_BUCKA_CONF+id,
					0x03, val);
}

static int da9211_set_current_limit(struct regulator_dev *rdev, int min,
				    int max)
{
	int id = rdev_get_id(rdev);
	struct da9211 *chip = rdev_get_drvdata(rdev);
	int i, max_size;
	const int *current_limits;

	switch (chip->chip_id) {
	case DA9211:
		current_limits = da9211_current_limits;
		max_size = ARRAY_SIZE(da9211_current_limits)-1;
		break;
	case DA9213:
		current_limits = da9213_current_limits;
		max_size = ARRAY_SIZE(da9213_current_limits)-1;
		break;
	case DA9215:
		current_limits = da9215_current_limits;
		max_size = ARRAY_SIZE(da9215_current_limits)-1;
		break;
	default:
		return -EINVAL;
	}

	/* search for closest to maximum */
	for (i = max_size; i >= 0; i--) {
		if (min <= current_limits[i] &&
		    max >= current_limits[i]) {
				return regmap_update_bits(chip->regmap,
					DA9211_REG_BUCK_ILIM,
					(0x0F << id*4), (i << id*4));
		}
	}

	return -EINVAL;
}

static int da9211_get_current_limit(struct regulator_dev *rdev)
{
	int id = rdev_get_id(rdev);
	struct da9211 *chip = rdev_get_drvdata(rdev);
	unsigned int data;
	int ret;
	const int *current_limits;

	switch (chip->chip_id) {
	case DA9211:
		current_limits = da9211_current_limits;
		break;
	case DA9213:
		current_limits = da9213_current_limits;
		break;
	case DA9215:
		current_limits = da9215_current_limits;
		break;
	default:
		return -EINVAL;
	}

	ret = regmap_read(chip->regmap, DA9211_REG_BUCK_ILIM, &data);
	if (ret < 0)
		return ret;

	/* select one of 16 values: 0000 (2000mA or 3000mA)
	 * to 1111 (5000mA or 6000mA).
	 */
	data = (data >> id*4) & 0x0F;
	return current_limits[data];
}

static const struct regulator_ops da9211_buck_ops = {
	.get_mode = da9211_buck_get_mode,
	.set_mode = da9211_buck_set_mode,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.is_enabled = regulator_is_enabled_regmap,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.list_voltage = regulator_list_voltage_linear,
	.set_current_limit = da9211_set_current_limit,
	.get_current_limit = da9211_get_current_limit,
};

#define DA9211_BUCK(_id) \
{\
	.name = #_id,\
	.ops = &da9211_buck_ops,\
	.type = REGULATOR_VOLTAGE,\
	.id = DA9211_ID_##_id,\
	.n_voltages = (DA9211_MAX_MV - DA9211_MIN_MV) / DA9211_STEP_MV + 1,\
	.min_uV = (DA9211_MIN_MV * 1000),\
	.uV_step = (DA9211_STEP_MV * 1000),\
	.enable_reg = DA9211_REG_BUCKA_CONT + DA9211_ID_##_id,\
	.enable_mask = DA9211_BUCKA_EN,\
	.vsel_reg = DA9211_REG_VBUCKA_A + DA9211_ID_##_id * 2,\
	.vsel_mask = DA9211_VBUCK_MASK,\
	.owner = THIS_MODULE,\
}

static struct regulator_desc da9211_regulators[] = {
	DA9211_BUCK(BUCKA),
	DA9211_BUCK(BUCKB),
};

#ifdef CONFIG_OF
static struct of_regulator_match da9211_matches[] = {
	[DA9211_ID_BUCKA] = { .name = "BUCKA" },
	[DA9211_ID_BUCKB] = { .name = "BUCKB" },
	};

static struct da9211_pdata *da9211_parse_regulators_dt(
		struct device *dev)
{
	struct da9211_pdata *pdata;
	struct device_node *node;
	int i, num, n;

	node = of_get_child_by_name(dev->of_node, "regulators");
	if (!node) {
		dev_err(dev, "regulators node not found\n");
		return ERR_PTR(-ENODEV);
	}

	num = of_regulator_match(dev, node, da9211_matches,
				 ARRAY_SIZE(da9211_matches));
	of_node_put(node);
	if (num < 0) {
		dev_err(dev, "Failed to match regulators\n");
		return ERR_PTR(-EINVAL);
	}

	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
		return ERR_PTR(-ENOMEM);

	pdata->num_buck = num;

	n = 0;
	for (i = 0; i < ARRAY_SIZE(da9211_matches); i++) {
		if (!da9211_matches[i].init_data)
			continue;

		pdata->init_data[n] = da9211_matches[i].init_data;
		pdata->reg_node[n] = da9211_matches[i].of_node;
		pdata->gpiod_ren[n] = devm_gpiod_get_from_of_node(dev,
								  da9211_matches[i].of_node,
								  "enable",
								  0,
								  GPIOD_OUT_HIGH,
								  "da9211-enable");
		n++;
	}

	return pdata;
}
#else
static struct da9211_pdata *da9211_parse_regulators_dt(
		struct device *dev)
{
	return ERR_PTR(-ENODEV);
}
#endif

static irqreturn_t da9211_irq_handler(int irq, void *data)
{
	struct da9211 *chip = data;
	int reg_val, err, ret = IRQ_NONE;

	err = regmap_read(chip->regmap, DA9211_REG_EVENT_B, &reg_val);
	if (err < 0)
		goto error_i2c;

	if (reg_val & DA9211_E_OV_CURR_A) {
		regulator_notifier_call_chain(chip->rdev[0],
			REGULATOR_EVENT_OVER_CURRENT, NULL);

		err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
			DA9211_E_OV_CURR_A);
		if (err < 0)
			goto error_i2c;

		ret = IRQ_HANDLED;
	}

	if (reg_val & DA9211_E_OV_CURR_B) {
		regulator_notifier_call_chain(chip->rdev[1],
			REGULATOR_EVENT_OVER_CURRENT, NULL);

		err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
			DA9211_E_OV_CURR_B);
		if (err < 0)
			goto error_i2c;

		ret = IRQ_HANDLED;
	}

	return ret;

error_i2c:
	dev_err(chip->dev, "I2C error : %d\n", err);
	return IRQ_NONE;
}

static int da9211_regulator_init(struct da9211 *chip)
{
	struct regulator_config config = { };
	int i, ret;
	unsigned int data;

	ret = regmap_read(chip->regmap, DA9211_REG_CONFIG_E, &data);
	if (ret < 0) {
		dev_err(chip->dev, "Failed to read CONFIG_E reg: %d\n", ret);
		return ret;
	}

	data &= DA9211_SLAVE_SEL;
	/* If configuration for 1/2 bucks is different between platform data
	 * and the register, driver should exit.
	 */
	if (chip->pdata->num_buck == 1 && data == 0x00)
		chip->num_regulator = 1;
	else if (chip->pdata->num_buck == 2 && data != 0x00)
		chip->num_regulator = 2;
	else {
		dev_err(chip->dev, "Configuration is mismatched\n");
		return -EINVAL;
	}

	for (i = 0; i < chip->num_regulator; i++) {
		config.init_data = chip->pdata->init_data[i];
		config.dev = chip->dev;
		config.driver_data = chip;
		config.regmap = chip->regmap;
		config.of_node = chip->pdata->reg_node[i];

		if (chip->pdata->gpiod_ren[i])
			config.ena_gpiod = chip->pdata->gpiod_ren[i];
		else
			config.ena_gpiod = NULL;

		chip->rdev[i] = devm_regulator_register(chip->dev,
			&da9211_regulators[i], &config);
		if (IS_ERR(chip->rdev[i])) {
			dev_err(chip->dev,
				"Failed to register DA9211 regulator\n");
			return PTR_ERR(chip->rdev[i]);
		}

		if (chip->chip_irq != 0) {
			ret = regmap_update_bits(chip->regmap,
				DA9211_REG_MASK_B, DA9211_M_OV_CURR_A << i, 0);
			if (ret < 0) {
				dev_err(chip->dev,
					"Failed to update mask reg: %d\n", ret);
				return ret;
			}
		}
	}

	return 0;
}

/*
 * I2C driver interface functions
 */
static int da9211_i2c_probe(struct i2c_client *i2c,
		const struct i2c_device_id *id)
{
	struct da9211 *chip;
	int error, ret;
	unsigned int data;

	chip = devm_kzalloc(&i2c->dev, sizeof(struct da9211), GFP_KERNEL);
	if (!chip)
		return -ENOMEM;

	chip->dev = &i2c->dev;
	chip->regmap = devm_regmap_init_i2c(i2c, &da9211_regmap_config);
	if (IS_ERR(chip->regmap)) {
		error = PTR_ERR(chip->regmap);
		dev_err(chip->dev, "Failed to allocate register map: %d\n",
			error);
		return error;
	}

	i2c_set_clientdata(i2c, chip);

	chip->pdata = i2c->dev.platform_data;

	ret = regmap_read(chip->regmap, DA9211_REG_DEVICE_ID, &data);
	if (ret < 0) {
		dev_err(chip->dev, "Failed to read DEVICE_ID reg: %d\n", ret);
		return ret;
	}

	switch (data) {
	case DA9211_DEVICE_ID:
		chip->chip_id = DA9211;
		break;
	case DA9213_DEVICE_ID:
		chip->chip_id = DA9213;
		break;
	case DA9215_DEVICE_ID:
		chip->chip_id = DA9215;
		break;
	default:
		dev_err(chip->dev, "Unsupported device id = 0x%x.\n", data);
		return -ENODEV;
	}

	if (!chip->pdata)
		chip->pdata = da9211_parse_regulators_dt(chip->dev);

	if (IS_ERR(chip->pdata)) {
		dev_err(chip->dev, "No regulators defined for the platform\n");
		return PTR_ERR(chip->pdata);
	}

	chip->chip_irq = i2c->irq;

	if (chip->chip_irq != 0) {
		ret = devm_request_threaded_irq(chip->dev, chip->chip_irq, NULL,
					da9211_irq_handler,
					IRQF_TRIGGER_LOW|IRQF_ONESHOT,
					"da9211", chip);
		if (ret != 0) {
			dev_err(chip->dev, "Failed to request IRQ: %d\n",
				chip->chip_irq);
			return ret;
		}
	} else {
		dev_warn(chip->dev, "No IRQ configured\n");
	}

	ret = da9211_regulator_init(chip);

	if (ret < 0)
		dev_err(chip->dev, "Failed to initialize regulator: %d\n", ret);

	return ret;
}

static const struct i2c_device_id da9211_i2c_id[] = {
	{"da9211", DA9211},
	{"da9212", DA9212},
	{"da9213", DA9213},
	{"da9223", DA9223},
	{"da9214", DA9214},
	{"da9224", DA9224},
	{"da9215", DA9215},
	{"da9225", DA9225},
	{},
};
MODULE_DEVICE_TABLE(i2c, da9211_i2c_id);

#ifdef CONFIG_OF
static const struct of_device_id da9211_dt_ids[] = {
	{ .compatible = "dlg,da9211", .data = &da9211_i2c_id[0] },
	{ .compatible = "dlg,da9212", .data = &da9211_i2c_id[1] },
	{ .compatible = "dlg,da9213", .data = &da9211_i2c_id[2] },
	{ .compatible = "dlg,da9223", .data = &da9211_i2c_id[3] },
	{ .compatible = "dlg,da9214", .data = &da9211_i2c_id[4] },
	{ .compatible = "dlg,da9224", .data = &da9211_i2c_id[5] },
	{ .compatible = "dlg,da9215", .data = &da9211_i2c_id[6] },
	{ .compatible = "dlg,da9225", .data = &da9211_i2c_id[7] },
	{},
};
MODULE_DEVICE_TABLE(of, da9211_dt_ids);
#endif

static struct i2c_driver da9211_regulator_driver = {
	.driver = {
		.name = "da9211",
		.of_match_table = of_match_ptr(da9211_dt_ids),
	},
	.probe = da9211_i2c_probe,
	.id_table = da9211_i2c_id,
};

module_i2c_driver(da9211_regulator_driver);

MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
MODULE_DESCRIPTION("DA9211/DA9212/DA9213/DA9223/DA9214/DA9224/DA9215/DA9225 regulator driver");
MODULE_LICENSE("GPL");