summaryrefslogtreecommitdiff
path: root/drivers/regulator/max77857-regulator.c
blob: 145ad02818578570b54d456fe0892fef85a9111c (plain)
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
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2023 Analog Devices, Inc.
 * ADI Regulator driver for the MAX77857
 * MAX77859 and MAX77831.
 */
#include <linux/bitfield.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>
#include <linux/util_macros.h>

#define MAX77857_REG_INT_SRC		0x10
#define MAX77857_REG_INT_MASK		0x11
#define MAX77857_REG_CONT1		0x12
#define MAX77857_REG_CONT2		0x13
#define MAX77857_REG_CONT3		0x14

#define MAX77857_INT_SRC_OCP		BIT(0)
#define MAX77857_INT_SRC_THS		BIT(1)
#define MAX77857_INT_SRC_HARDSHORT	BIT(2)
#define MAX77857_INT_SRC_OVP		BIT(3)
#define MAX77857_INT_SRC_POK		BIT(4)

#define MAX77857_ILIM_MASK		GENMASK(2, 0)
#define MAX77857_CONT1_FREQ		GENMASK(4, 3)
#define MAX77857_CONT3_FPWM		BIT(5)

#define MAX77859_REG_INT_SRC		0x11
#define MAX77859_REG_CONT1		0x13
#define MAX77859_REG_CONT2		0x14
#define MAX77859_REG_CONT3		0x15
#define MAX77859_REG_CONT5		0x17
#define MAX77859_CONT2_FPWM		BIT(2)
#define MAX77859_CONT2_INTB		BIT(3)
#define MAX77859_CONT3_DVS_START	BIT(2)
#define MAX77859_VOLTAGE_SEL_MASK	GENMASK(9, 0)

#define MAX77859_CURRENT_MIN		1000000
#define MAX77859_CURRENT_MAX		5000000
#define MAX77859_CURRENT_STEP		50000

enum max77857_id {
	ID_MAX77831 = 1,
	ID_MAX77857,
	ID_MAX77859,
	ID_MAX77859A,
};

static bool max77857_volatile_reg(struct device *dev, unsigned int reg)
{
	enum max77857_id id = (uintptr_t)dev_get_drvdata(dev);

	switch (id) {
	case ID_MAX77831:
	case ID_MAX77857:
		return reg == MAX77857_REG_INT_SRC;
	case ID_MAX77859:
	case ID_MAX77859A:
		return reg == MAX77859_REG_INT_SRC;
	default:
		return true;
	}
}

static struct regmap_config max77857_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.cache_type = REGCACHE_MAPLE,
	.volatile_reg = max77857_volatile_reg,
};

static int max77857_get_status(struct regulator_dev *rdev)
{
	unsigned int val;
	int ret;

	ret = regmap_read(rdev->regmap, MAX77857_REG_INT_SRC, &val);
	if (ret)
		return ret;

	if (FIELD_GET(MAX77857_INT_SRC_POK, val))
		return REGULATOR_STATUS_ON;

	return REGULATOR_STATUS_ERROR;
}

static unsigned int max77857_get_mode(struct regulator_dev *rdev)
{
	enum max77857_id id = (uintptr_t)rdev_get_drvdata(rdev);
	unsigned int regval;
	int ret;

	switch (id) {
	case ID_MAX77831:
	case ID_MAX77857:
		ret = regmap_read(rdev->regmap, MAX77857_REG_CONT3, &regval);
		if (ret)
			return ret;

		if (FIELD_GET(MAX77857_CONT3_FPWM, regval))
			return REGULATOR_MODE_FAST;

		break;
	case ID_MAX77859:
	case ID_MAX77859A:
		ret = regmap_read(rdev->regmap, MAX77859_REG_CONT2, &regval);
		if (ret)
			return ret;

		if (FIELD_GET(MAX77859_CONT2_FPWM, regval))
			return REGULATOR_MODE_FAST;

		break;
	default:
		return -EINVAL;
	}

	return REGULATOR_MODE_NORMAL;
}

static int max77857_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
	enum max77857_id id = (uintptr_t)rdev_get_drvdata(rdev);
	unsigned int reg, val;

	switch (id) {
	case ID_MAX77831:
	case ID_MAX77857:
		reg = MAX77857_REG_CONT3;
		val = MAX77857_CONT3_FPWM;
		break;
	case ID_MAX77859:
	case ID_MAX77859A:
		reg = MAX77859_REG_CONT2;
		val = MAX77859_CONT2_FPWM;
		break;
	default:
		return -EINVAL;
	}

	switch (mode) {
	case REGULATOR_MODE_FAST:
		return regmap_set_bits(rdev->regmap, reg, val);
	case REGULATOR_MODE_NORMAL:
		return regmap_clear_bits(rdev->regmap, reg, val);
	default:
		return -EINVAL;
	}
}

static int max77857_get_error_flags(struct regulator_dev *rdev,
				    unsigned int *flags)
{
	unsigned int val;
	int ret;

	ret = regmap_read(rdev->regmap, MAX77857_REG_INT_SRC, &val);
	if (ret)
		return ret;

	*flags = 0;

	if (FIELD_GET(MAX77857_INT_SRC_OVP, val))
		*flags |= REGULATOR_ERROR_OVER_VOLTAGE_WARN;

	if (FIELD_GET(MAX77857_INT_SRC_OCP, val) ||
	    FIELD_GET(MAX77857_INT_SRC_HARDSHORT, val))
		*flags |= REGULATOR_ERROR_OVER_CURRENT;

	if (FIELD_GET(MAX77857_INT_SRC_THS, val))
		*flags |= REGULATOR_ERROR_OVER_TEMP;

	if (!FIELD_GET(MAX77857_INT_SRC_POK, val))
		*flags |= REGULATOR_ERROR_FAIL;

	return 0;
}

static struct linear_range max77859_lin_ranges[] = {
	REGULATOR_LINEAR_RANGE(3200000, 0x0A0, 0x320, 20000)
};

static const unsigned int max77859_ramp_table[4] = {
	1000, 500, 250, 125
};

static int max77859_set_voltage_sel(struct regulator_dev *rdev,
				    unsigned int sel)
{
	__be16 reg;
	int ret;

	reg = cpu_to_be16(sel);

	ret = regmap_bulk_write(rdev->regmap, MAX77859_REG_CONT3, &reg, 2);
	if (ret)
		return ret;

	/* actually apply new voltage */
	return regmap_set_bits(rdev->regmap, MAX77859_REG_CONT3,
			       MAX77859_CONT3_DVS_START);
}

static int max77859_get_voltage_sel(struct regulator_dev *rdev)
{
	__be16 reg;
	int ret;

	ret = regmap_bulk_read(rdev->regmap, MAX77859_REG_CONT3, &reg, 2);
	if (ret)
		return ret;

	return FIELD_GET(MAX77859_VOLTAGE_SEL_MASK, __be16_to_cpu(reg));
}

static int max77859_set_current_limit(struct regulator_dev *rdev, int min_uA, int max_uA)
{
	u32 selector;

	if (max_uA < MAX77859_CURRENT_MIN)
		return -EINVAL;

	selector = 0x12 + (max_uA - MAX77859_CURRENT_MIN) / MAX77859_CURRENT_STEP;

	selector = clamp_val(selector, 0x00, 0x7F);

	return regmap_write(rdev->regmap, MAX77859_REG_CONT5, selector);
}

static int max77859_get_current_limit(struct regulator_dev *rdev)
{
	u32 selector;
	int ret;

	ret = regmap_read(rdev->regmap, MAX77859_REG_CONT5, &selector);
	if (ret)
		return ret;

	if (selector <= 0x12)
		return MAX77859_CURRENT_MIN;

	if (selector >= 0x64)
		return MAX77859_CURRENT_MAX;

	return MAX77859_CURRENT_MIN + (selector - 0x12) * MAX77859_CURRENT_STEP;
}

static const struct regulator_ops max77859_regulator_ops = {
	.list_voltage = regulator_list_voltage_linear_range,
	.set_voltage_sel = max77859_set_voltage_sel,
	.get_voltage_sel = max77859_get_voltage_sel,
	.set_ramp_delay = regulator_set_ramp_delay_regmap,
	.get_status = max77857_get_status,
	.set_mode = max77857_set_mode,
	.get_mode = max77857_get_mode,
	.get_error_flags = max77857_get_error_flags,
};

static const struct regulator_ops max77859a_regulator_ops = {
	.list_voltage = regulator_list_voltage_linear_range,
	.set_voltage_sel = max77859_set_voltage_sel,
	.get_voltage_sel = max77859_get_voltage_sel,
	.set_current_limit = max77859_set_current_limit,
	.get_current_limit = max77859_get_current_limit,
	.set_ramp_delay = regulator_set_ramp_delay_regmap,
	.get_status = max77857_get_status,
	.set_mode = max77857_set_mode,
	.get_mode = max77857_get_mode,
	.get_error_flags = max77857_get_error_flags,
};

static const struct regulator_ops max77857_regulator_ops = {
	.list_voltage = regulator_list_voltage_linear_range,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.set_ramp_delay = regulator_set_ramp_delay_regmap,
	.get_status = max77857_get_status,
	.set_mode = max77857_set_mode,
	.get_mode = max77857_get_mode,
	.get_error_flags = max77857_get_error_flags,
};

static struct linear_range max77857_lin_ranges[] = {
	REGULATOR_LINEAR_RANGE(4485000, 0x3D, 0xCC, 73500)
};

static const unsigned int max77857_switch_freq[] = {
	1200000, 1500000, 1800000, 2100000
};

#define RAMAP_DELAY_INIT_VAL 1333

static const unsigned int max77857_ramp_table[2][4] = {
	{ RAMAP_DELAY_INIT_VAL, 667, 333, 227 }, /* when switch freq is 1.8MHz or 2.1MHz */
	{ 1166, 667, 333, 167 }, /* when switch freq is 1.2MHz or 1.5MHz */
};

static struct regulator_desc max77857_regulator_desc = {
	.ops = &max77857_regulator_ops,
	.name = "max77857",
	.linear_ranges = max77857_lin_ranges,
	.n_linear_ranges = ARRAY_SIZE(max77857_lin_ranges),
	.vsel_mask = 0xFF,
	.vsel_reg = MAX77857_REG_CONT2,
	.ramp_delay_table = max77857_ramp_table[0],
	.n_ramp_values = ARRAY_SIZE(max77857_ramp_table[0]),
	.ramp_reg = MAX77857_REG_CONT3,
	.ramp_mask = GENMASK(1, 0),
	.ramp_delay = RAMAP_DELAY_INIT_VAL,
	.owner = THIS_MODULE,
};

static void max77857_calc_range(struct device *dev, enum max77857_id id)
{
	struct linear_range *range;
	unsigned long vref_step;
	u32 rtop = 0;
	u32 rbot = 0;

	device_property_read_u32(dev, "adi,rtop-ohms", &rtop);
	device_property_read_u32(dev, "adi,rbot-ohms", &rbot);

	if (!rbot || !rtop)
		return;

	switch (id) {
	case ID_MAX77831:
	case ID_MAX77857:
		range = max77857_lin_ranges;
		vref_step = 4900UL;
		break;
	case ID_MAX77859:
	case ID_MAX77859A:
		range = max77859_lin_ranges;
		vref_step = 1250UL;
		break;
	}

	range->step = DIV_ROUND_CLOSEST(vref_step * (rbot + rtop), rbot);
	range->min = range->step * range->min_sel;
}

static int max77857_probe(struct i2c_client *client)
{
	const struct i2c_device_id *i2c_id;
	struct device *dev = &client->dev;
	struct regulator_config cfg = { };
	struct regulator_dev *rdev;
	struct regmap *regmap;
	enum max77857_id id;
	u32 switch_freq = 0;
	int ret;

	i2c_id = i2c_client_get_device_id(client);
	if (!i2c_id)
		return -EINVAL;

	id = i2c_id->driver_data;

	dev_set_drvdata(dev, (void *)id);

	if (id == ID_MAX77859 || id == ID_MAX77859A) {
		max77857_regulator_desc.ops = &max77859_regulator_ops;
		max77857_regulator_desc.linear_ranges = max77859_lin_ranges;
		max77857_regulator_desc.ramp_delay_table = max77859_ramp_table;
		max77857_regulator_desc.ramp_delay = max77859_ramp_table[0];
	}

	if (id == ID_MAX77859A)
		max77857_regulator_desc.ops = &max77859a_regulator_ops;

	max77857_calc_range(dev, id);

	regmap = devm_regmap_init_i2c(client, &max77857_regmap_config);
	if (IS_ERR(regmap))
		return dev_err_probe(dev, PTR_ERR(regmap),
				     "cannot initialize regmap\n");

	device_property_read_u32(dev, "adi,switch-frequency-hz", &switch_freq);
	if (switch_freq) {
		switch_freq = find_closest(switch_freq, max77857_switch_freq,
					   ARRAY_SIZE(max77857_switch_freq));

		if (id == ID_MAX77831 && switch_freq == 3)
			switch_freq = 2;

		switch (id) {
		case ID_MAX77831:
		case ID_MAX77857:
			ret = regmap_update_bits(regmap, MAX77857_REG_CONT1,
						 MAX77857_CONT1_FREQ, switch_freq);

			if (switch_freq >= 2)
				break;

			max77857_regulator_desc.ramp_delay_table = max77857_ramp_table[1];
			max77857_regulator_desc.ramp_delay = max77857_ramp_table[1][0];
			break;
		case ID_MAX77859:
		case ID_MAX77859A:
			ret = regmap_update_bits(regmap, MAX77859_REG_CONT1,
						 MAX77857_CONT1_FREQ, switch_freq);
			break;
		}
		if (ret)
			return ret;
	}

	cfg.dev = dev;
	cfg.driver_data = (void *)id;
	cfg.regmap = regmap;
	cfg.init_data = of_get_regulator_init_data(dev, dev->of_node,
						   &max77857_regulator_desc);
	if (!cfg.init_data)
		return -ENOMEM;

	rdev = devm_regulator_register(dev, &max77857_regulator_desc, &cfg);
	if (IS_ERR(rdev))
		return dev_err_probe(dev, PTR_ERR(rdev),
				     "cannot register regulator\n");

	return 0;
}

const struct i2c_device_id max77857_id[] = {
	{ "max77831", ID_MAX77831 },
	{ "max77857", ID_MAX77857 },
	{ "max77859", ID_MAX77859 },
	{ "max77859a", ID_MAX77859A },
	{ }
};
MODULE_DEVICE_TABLE(i2c, max77857_id);

static const struct of_device_id max77857_of_id[] = {
	{ .compatible = "adi,max77831", .data = (void *)ID_MAX77831 },
	{ .compatible = "adi,max77857", .data = (void *)ID_MAX77857 },
	{ .compatible = "adi,max77859", .data = (void *)ID_MAX77859 },
	{ .compatible = "adi,max77859a", .data = (void *)ID_MAX77859A },
	{ }
};
MODULE_DEVICE_TABLE(of, max77857_of_id);

static struct i2c_driver max77857_driver = {
	.driver = {
		.name = "max77857",
		.of_match_table = max77857_of_id,
	},
	.id_table = max77857_id,
	.probe = max77857_probe,
};
module_i2c_driver(max77857_driver);

MODULE_DESCRIPTION("Analog Devices MAX77857 Buck-Boost Converter Driver");
MODULE_AUTHOR("Ibrahim Tilki <Ibrahim.Tilki@analog.com>");
MODULE_AUTHOR("Okan Sahin <Okan.Sahin@analog.com>");
MODULE_LICENSE("GPL");