summaryrefslogtreecommitdiffstats
path: root/drivers/regulator/ltc3589.c
blob: 38f7ccb63b5283262828cf5ca3d0ca85bbb8096a (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
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
// SPDX-License-Identifier: GPL-2.0
//
// Linear Technology LTC3589,LTC3589-1 regulator support
//
// Copyright (c) 2014 Philipp Zabel <p.zabel@pengutronix.de>, Pengutronix

#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>

#define DRIVER_NAME		"ltc3589"

#define LTC3589_IRQSTAT		0x02
#define LTC3589_SCR1		0x07
#define LTC3589_OVEN		0x10
#define LTC3589_SCR2		0x12
#define LTC3589_PGSTAT		0x13
#define LTC3589_VCCR		0x20
#define LTC3589_CLIRQ		0x21
#define LTC3589_B1DTV1		0x23
#define LTC3589_B1DTV2		0x24
#define LTC3589_VRRCR		0x25
#define LTC3589_B2DTV1		0x26
#define LTC3589_B2DTV2		0x27
#define LTC3589_B3DTV1		0x29
#define LTC3589_B3DTV2		0x2a
#define LTC3589_L2DTV1		0x32
#define LTC3589_L2DTV2		0x33

#define LTC3589_IRQSTAT_PGOOD_TIMEOUT	BIT(3)
#define LTC3589_IRQSTAT_UNDERVOLT_WARN	BIT(4)
#define LTC3589_IRQSTAT_UNDERVOLT_FAULT	BIT(5)
#define LTC3589_IRQSTAT_THERMAL_WARN	BIT(6)
#define LTC3589_IRQSTAT_THERMAL_FAULT	BIT(7)

#define LTC3589_OVEN_SW1		BIT(0)
#define LTC3589_OVEN_SW2		BIT(1)
#define LTC3589_OVEN_SW3		BIT(2)
#define LTC3589_OVEN_BB_OUT		BIT(3)
#define LTC3589_OVEN_LDO2		BIT(4)
#define LTC3589_OVEN_LDO3		BIT(5)
#define LTC3589_OVEN_LDO4		BIT(6)
#define LTC3589_OVEN_SW_CTRL		BIT(7)

#define LTC3589_VCCR_SW1_GO		BIT(0)
#define LTC3589_VCCR_SW2_GO		BIT(2)
#define LTC3589_VCCR_SW3_GO		BIT(4)
#define LTC3589_VCCR_LDO2_GO		BIT(6)

enum ltc3589_variant {
	LTC3589,
	LTC3589_1,
	LTC3589_2,
};

enum ltc3589_reg {
	LTC3589_SW1,
	LTC3589_SW2,
	LTC3589_SW3,
	LTC3589_BB_OUT,
	LTC3589_LDO1,
	LTC3589_LDO2,
	LTC3589_LDO3,
	LTC3589_LDO4,
	LTC3589_NUM_REGULATORS,
};

struct ltc3589 {
	struct regmap *regmap;
	struct device *dev;
	enum ltc3589_variant variant;
	struct regulator_desc regulator_descs[LTC3589_NUM_REGULATORS];
	struct regulator_dev *regulators[LTC3589_NUM_REGULATORS];
};

static const int ltc3589_ldo4[] = {
	2800000, 2500000, 1800000, 3300000,
};

static const int ltc3589_12_ldo4[] = {
	1200000, 1800000, 2500000, 3200000,
};

static int ltc3589_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
{
	struct ltc3589 *ltc3589 = rdev_get_drvdata(rdev);
	int sel, shift;

	if (unlikely(ramp_delay <= 0))
		return -EINVAL;

	/* VRRCR slew rate offsets are the same as VCCR go bit offsets */
	shift = ffs(rdev->desc->apply_bit) - 1;

	/* The slew rate can be set to 0.88, 1.75, 3.5, or 7 mV/uS */
	for (sel = 0; sel < 4; sel++) {
		if ((880 << sel) >= ramp_delay) {
			return regmap_update_bits(ltc3589->regmap,
						  LTC3589_VRRCR,
						  0x3 << shift, sel << shift);
		}
	}
	return -EINVAL;
}

static int ltc3589_set_suspend_voltage(struct regulator_dev *rdev, int uV)
{
	struct ltc3589 *ltc3589 = rdev_get_drvdata(rdev);
	int sel;

	sel = regulator_map_voltage_linear(rdev, uV, uV);
	if (sel < 0)
		return sel;

	/* DTV2 register follows right after the corresponding DTV1 register */
	return regmap_update_bits(ltc3589->regmap, rdev->desc->vsel_reg + 1,
				  rdev->desc->vsel_mask, sel);
}

static int ltc3589_set_suspend_mode(struct regulator_dev *rdev,
				    unsigned int mode)
{
	struct ltc3589 *ltc3589 = rdev_get_drvdata(rdev);
	int mask, bit = 0;

	/* VCCR reference selects are right next to the VCCR go bits */
	mask = rdev->desc->apply_bit << 1;

	if (mode == REGULATOR_MODE_STANDBY)
		bit = mask;	/* Select DTV2 */

	mask |= rdev->desc->apply_bit;
	bit |= rdev->desc->apply_bit;
	return regmap_update_bits(ltc3589->regmap, LTC3589_VCCR, mask, bit);
}

/* SW1, SW2, SW3, LDO2 */
static const struct regulator_ops ltc3589_linear_regulator_ops = {
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.is_enabled = regulator_is_enabled_regmap,
	.list_voltage = regulator_list_voltage_linear,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.set_ramp_delay = ltc3589_set_ramp_delay,
	.set_voltage_time_sel = regulator_set_voltage_time_sel,
	.set_suspend_voltage = ltc3589_set_suspend_voltage,
	.set_suspend_mode = ltc3589_set_suspend_mode,
};

/* BB_OUT, LDO3 */
static const struct regulator_ops ltc3589_fixed_regulator_ops = {
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.is_enabled = regulator_is_enabled_regmap,
};

/* LDO1 */
static const struct regulator_ops ltc3589_fixed_standby_regulator_ops = {
};

/* LDO4 */
static const struct regulator_ops ltc3589_table_regulator_ops = {
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.is_enabled = regulator_is_enabled_regmap,
	.list_voltage = regulator_list_voltage_table,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
};

static inline unsigned int ltc3589_scale(unsigned int uV, u32 r1, u32 r2)
{
	uint64_t tmp;

	if (uV == 0)
		return 0;

	tmp = (uint64_t)uV * r1;
	do_div(tmp, r2);
	return uV + (unsigned int)tmp;
}

static int ltc3589_of_parse_cb(struct device_node *np,
			       const struct regulator_desc *desc,
			       struct regulator_config *config)
{
	struct ltc3589 *ltc3589 = config->driver_data;
	struct regulator_desc *rdesc = &ltc3589->regulator_descs[desc->id];
	u32 r[2];
	int ret;

	/* Parse feedback voltage dividers. LDO3 and LDO4 don't have them */
	if (desc->id >= LTC3589_LDO3)
		return 0;

	ret = of_property_read_u32_array(np, "lltc,fb-voltage-divider", r, 2);
	if (ret) {
		dev_err(ltc3589->dev, "Failed to parse voltage divider: %d\n",
			ret);
		return ret;
	}

	if (!r[0] || !r[1])
		return 0;

	rdesc->min_uV = ltc3589_scale(desc->min_uV, r[0], r[1]);
	rdesc->uV_step = ltc3589_scale(desc->uV_step, r[0], r[1]);
	rdesc->fixed_uV = ltc3589_scale(desc->fixed_uV, r[0], r[1]);

	return 0;
}

#define LTC3589_REG(_name, _of_name, _ops, en_bit, dtv1_reg, dtv_mask, go_bit)\
	[LTC3589_ ## _name] = {						\
		.name = #_name,						\
		.of_match = of_match_ptr(#_of_name),			\
		.regulators_node = of_match_ptr("regulators"),		\
		.of_parse_cb = ltc3589_of_parse_cb,			\
		.n_voltages = (dtv_mask) + 1,				\
		.min_uV = (go_bit) ? 362500 : 0,			\
		.uV_step = (go_bit) ? 12500 : 0,			\
		.ramp_delay = (go_bit) ? 1750 : 0,			\
		.fixed_uV = (dtv_mask) ? 0 : 800000,			\
		.ops = &ltc3589_ ## _ops ## _regulator_ops,		\
		.type = REGULATOR_VOLTAGE,				\
		.id = LTC3589_ ## _name,				\
		.owner = THIS_MODULE,					\
		.vsel_reg = (dtv1_reg),					\
		.vsel_mask = (dtv_mask),				\
		.apply_reg = (go_bit) ? LTC3589_VCCR : 0,		\
		.apply_bit = (go_bit),					\
		.enable_reg = (en_bit) ? LTC3589_OVEN : 0,		\
		.enable_mask = (en_bit),				\
	}

#define LTC3589_LINEAR_REG(_name, _of_name, _dtv1)			\
	LTC3589_REG(_name, _of_name, linear, LTC3589_OVEN_ ## _name,	\
		    LTC3589_ ## _dtv1, 0x1f,				\
		    LTC3589_VCCR_ ## _name ## _GO)

#define LTC3589_FIXED_REG(_name, _of_name)				\
	LTC3589_REG(_name, _of_name, fixed, LTC3589_OVEN_ ## _name, 0, 0, 0)

static const struct regulator_desc ltc3589_regulators[] = {
	LTC3589_LINEAR_REG(SW1, sw1, B1DTV1),
	LTC3589_LINEAR_REG(SW2, sw2, B2DTV1),
	LTC3589_LINEAR_REG(SW3, sw3, B3DTV1),
	LTC3589_FIXED_REG(BB_OUT, bb-out),
	LTC3589_REG(LDO1, ldo1, fixed_standby, 0, 0, 0, 0),
	LTC3589_LINEAR_REG(LDO2, ldo2, L2DTV1),
	LTC3589_FIXED_REG(LDO3, ldo3),
	LTC3589_REG(LDO4, ldo4, table, LTC3589_OVEN_LDO4, LTC3589_L2DTV2,
		    0x60, 0),
};

static bool ltc3589_writeable_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case LTC3589_IRQSTAT:
	case LTC3589_SCR1:
	case LTC3589_OVEN:
	case LTC3589_SCR2:
	case LTC3589_VCCR:
	case LTC3589_CLIRQ:
	case LTC3589_B1DTV1:
	case LTC3589_B1DTV2:
	case LTC3589_VRRCR:
	case LTC3589_B2DTV1:
	case LTC3589_B2DTV2:
	case LTC3589_B3DTV1:
	case LTC3589_B3DTV2:
	case LTC3589_L2DTV1:
	case LTC3589_L2DTV2:
		return true;
	}
	return false;
}

static bool ltc3589_readable_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case LTC3589_IRQSTAT:
	case LTC3589_SCR1:
	case LTC3589_OVEN:
	case LTC3589_SCR2:
	case LTC3589_PGSTAT:
	case LTC3589_VCCR:
	case LTC3589_B1DTV1:
	case LTC3589_B1DTV2:
	case LTC3589_VRRCR:
	case LTC3589_B2DTV1:
	case LTC3589_B2DTV2:
	case LTC3589_B3DTV1:
	case LTC3589_B3DTV2:
	case LTC3589_L2DTV1:
	case LTC3589_L2DTV2:
		return true;
	}
	return false;
}

static bool ltc3589_volatile_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case LTC3589_IRQSTAT:
	case LTC3589_PGSTAT:
	case LTC3589_VCCR:
		return true;
	}
	return false;
}

static const struct reg_default ltc3589_reg_defaults[] = {
	{ LTC3589_SCR1,   0x00 },
	{ LTC3589_OVEN,   0x00 },
	{ LTC3589_SCR2,   0x00 },
	{ LTC3589_VCCR,   0x00 },
	{ LTC3589_B1DTV1, 0x19 },
	{ LTC3589_B1DTV2, 0x19 },
	{ LTC3589_VRRCR,  0xff },
	{ LTC3589_B2DTV1, 0x19 },
	{ LTC3589_B2DTV2, 0x19 },
	{ LTC3589_B3DTV1, 0x19 },
	{ LTC3589_B3DTV2, 0x19 },
	{ LTC3589_L2DTV1, 0x19 },
	{ LTC3589_L2DTV2, 0x19 },
};

static const struct regmap_config ltc3589_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.writeable_reg = ltc3589_writeable_reg,
	.readable_reg = ltc3589_readable_reg,
	.volatile_reg = ltc3589_volatile_reg,
	.max_register = LTC3589_L2DTV2,
	.reg_defaults = ltc3589_reg_defaults,
	.num_reg_defaults = ARRAY_SIZE(ltc3589_reg_defaults),
	.use_single_read = true,
	.use_single_write = true,
	.cache_type = REGCACHE_RBTREE,
};

static irqreturn_t ltc3589_isr(int irq, void *dev_id)
{
	struct ltc3589 *ltc3589 = dev_id;
	unsigned int i, irqstat, event;

	regmap_read(ltc3589->regmap, LTC3589_IRQSTAT, &irqstat);

	if (irqstat & LTC3589_IRQSTAT_THERMAL_WARN) {
		event = REGULATOR_EVENT_OVER_TEMP;
		for (i = 0; i < LTC3589_NUM_REGULATORS; i++)
			regulator_notifier_call_chain(ltc3589->regulators[i],
						      event, NULL);
	}

	if (irqstat & LTC3589_IRQSTAT_UNDERVOLT_WARN) {
		event = REGULATOR_EVENT_UNDER_VOLTAGE;
		for (i = 0; i < LTC3589_NUM_REGULATORS; i++)
			regulator_notifier_call_chain(ltc3589->regulators[i],
						      event, NULL);
	}

	/* Clear warning condition */
	regmap_write(ltc3589->regmap, LTC3589_CLIRQ, 0);

	return IRQ_HANDLED;
}

static int ltc3589_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	struct device *dev = &client->dev;
	struct regulator_desc *descs;
	struct ltc3589 *ltc3589;
	int i, ret;

	ltc3589 = devm_kzalloc(dev, sizeof(*ltc3589), GFP_KERNEL);
	if (!ltc3589)
		return -ENOMEM;

	i2c_set_clientdata(client, ltc3589);
	if (client->dev.of_node)
		ltc3589->variant = (enum ltc3589_variant)
			of_device_get_match_data(&client->dev);
	else
		ltc3589->variant = id->driver_data;
	ltc3589->dev = dev;

	descs = ltc3589->regulator_descs;
	memcpy(descs, ltc3589_regulators, sizeof(ltc3589_regulators));
	if (ltc3589->variant == LTC3589) {
		descs[LTC3589_LDO3].fixed_uV = 1800000;
		descs[LTC3589_LDO4].volt_table = ltc3589_ldo4;
	} else {
		descs[LTC3589_LDO3].fixed_uV = 2800000;
		descs[LTC3589_LDO4].volt_table = ltc3589_12_ldo4;
	}

	ltc3589->regmap = devm_regmap_init_i2c(client, &ltc3589_regmap_config);
	if (IS_ERR(ltc3589->regmap)) {
		ret = PTR_ERR(ltc3589->regmap);
		dev_err(dev, "failed to initialize regmap: %d\n", ret);
		return ret;
	}

	for (i = 0; i < LTC3589_NUM_REGULATORS; i++) {
		struct regulator_desc *desc = &ltc3589->regulator_descs[i];
		struct regulator_config config = { };

		config.dev = dev;
		config.driver_data = ltc3589;

		ltc3589->regulators[i] = devm_regulator_register(dev, desc,
								 &config);
		if (IS_ERR(ltc3589->regulators[i])) {
			ret = PTR_ERR(ltc3589->regulators[i]);
			dev_err(dev, "failed to register regulator %s: %d\n",
				desc->name, ret);
			return ret;
		}
	}

	if (client->irq) {
		ret = devm_request_threaded_irq(dev, client->irq, NULL,
						ltc3589_isr,
						IRQF_TRIGGER_LOW | IRQF_ONESHOT,
						client->name, ltc3589);
		if (ret) {
			dev_err(dev, "Failed to request IRQ: %d\n", ret);
			return ret;
		}
	}

	return 0;
}

static const struct i2c_device_id ltc3589_i2c_id[] = {
	{ "ltc3589",   LTC3589   },
	{ "ltc3589-1", LTC3589_1 },
	{ "ltc3589-2", LTC3589_2 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, ltc3589_i2c_id);

static const struct of_device_id __maybe_unused ltc3589_of_match[] = {
	{
		.compatible = "lltc,ltc3589",
		.data = (void *)LTC3589,
	},
	{
		.compatible = "lltc,ltc3589-1",
		.data = (void *)LTC3589_1,
	},
	{
		.compatible = "lltc,ltc3589-2",
		.data = (void *)LTC3589_2,
	},
	{ },
};
MODULE_DEVICE_TABLE(of, ltc3589_of_match);

static struct i2c_driver ltc3589_driver = {
	.driver = {
		.name = DRIVER_NAME,
		.of_match_table = of_match_ptr(ltc3589_of_match),
	},
	.probe = ltc3589_probe,
	.id_table = ltc3589_i2c_id,
};
module_i2c_driver(ltc3589_driver);

MODULE_AUTHOR("Philipp Zabel <p.zabel@pengutronix.de>");
MODULE_DESCRIPTION("Regulator driver for Linear Technology LTC3589(-1,2)");
MODULE_LICENSE("GPL v2");